drivers/infiniband/hw/i40iw/i40iw_cm.c

   1 /*******************************************************************************
   2 *
   3 * Copyright (c) 2015-2016 Intel Corporation.  All rights reserved.
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the
   9 * OpenFabrics.org BSD license below:
  10 *
  11 *   Redistribution and use in source and binary forms, with or
  12 *   without modification, are permitted provided that the following
  13 *   conditions are met:
  14 *
  15 *    - Redistributions of source code must retain the above
  16 *       copyright notice, this list of conditions and the following
  17 *       disclaimer.
  18 *
  19 *    - Redistributions in binary form must reproduce the above
  20 *       copyright notice, this list of conditions and the following
  21 *       disclaimer in the documentation and/or other materials
  22 *       provided with the distribution.
  23 *
  24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31 * SOFTWARE.
  32 *
  33 *******************************************************************************/
  34
  35 #include <linux/atomic.h>
  36 #include <linux/ip.h>
  37 #include <linux/tcp.h>
  38 #include <linux/init.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/if_vlan.h>
  41 #include <linux/notifier.h>
  42 #include <linux/net.h>
  43 #include <linux/types.h>
  44 #include <linux/timer.h>
  45 #include <linux/time.h>
  46 #include <linux/delay.h>
  47 #include <linux/etherdevice.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/random.h>
  50 #include <linux/list.h>
  51 #include <linux/threads.h>
  52 #include <linux/highmem.h>
  53 #include <net/arp.h>
  54 #include <net/ndisc.h>
  55 #include <net/neighbour.h>
  56 #include <net/route.h>
  57 #include <net/addrconf.h>
  58 #include <net/ip6_route.h>
  59 #include <net/ip_fib.h>
  60 #include <net/tcp.h>
  61 #include <asm/checksum.h>
  62
  63 #include "i40iw.h"
  64
  65 static void i40iw_rem_ref_cm_node(struct i40iw_cm_node *);
  66 static void i40iw_cm_post_event(struct i40iw_cm_event *event);
  67 static void i40iw_disconnect_worker(struct work_struct *work);
  68
  69 /**
  70  * i40iw_free_sqbuf - put back puda buffer if refcount = 0
  71  * @vsi: pointer to vsi structure
  72  * @buf: puda buffer to free
  73  */
  74 void i40iw_free_sqbuf(struct i40iw_sc_vsi *vsi, void *bufp)
  75 {
  76         struct i40iw_puda_buf *buf = (struct i40iw_puda_buf *)bufp;
  77         struct i40iw_puda_rsrc *ilq = vsi->ilq;
  78
  79         if (!atomic_dec_return(&buf->refcount))
  80                 i40iw_puda_ret_bufpool(ilq, buf);
  81 }
  82
  83 /**
  84  * i40iw_derive_hw_ird_setting - Calculate IRD
  85  *
  86  * @cm_ird: IRD of connection's node
  87  *
  88  * The ird from the connection is rounded to a supported HW
  89  * setting (2,8,32,64) and then encoded for ird_size field of
  90  * qp_ctx
  91  */
  92 static u8 i40iw_derive_hw_ird_setting(u16 cm_ird)
  93 {
  94         u8 encoded_ird_size;
  95         u8 pof2_cm_ird = 1;
  96
  97         /* round-off to next powerof2 */
  98         while (pof2_cm_ird < cm_ird)
  99                 pof2_cm_ird *= 2;
 100
 101         /* ird_size field is encoded in qp_ctx */
 102         switch (pof2_cm_ird) {
 103         case I40IW_HW_IRD_SETTING_64:
 104                 encoded_ird_size = 3;
 105                 break;
 106         case I40IW_HW_IRD_SETTING_32:
 107         case I40IW_HW_IRD_SETTING_16:
 108                 encoded_ird_size = 2;
 109                 break;
 110         case I40IW_HW_IRD_SETTING_8:
 111         case I40IW_HW_IRD_SETTING_4:
 112                 encoded_ird_size = 1;
 113                 break;
 114         case I40IW_HW_IRD_SETTING_2:
 115         default:
 116                 encoded_ird_size = 0;
 117                 break;
 118         }
 119         return encoded_ird_size;
 120 }
 121
 122 /**
 123  * i40iw_record_ird_ord - Record IRD/ORD passed in
 124  * @cm_node: connection's node
 125  * @conn_ird: connection IRD
 126  * @conn_ord: connection ORD
 127  */
 128 static void i40iw_record_ird_ord(struct i40iw_cm_node *cm_node, u16 conn_ird, u16 conn_ord)
 129 {
 130         if (conn_ird > I40IW_MAX_IRD_SIZE)
 131                 conn_ird = I40IW_MAX_IRD_SIZE;
 132
 133         if (conn_ord > I40IW_MAX_ORD_SIZE)
 134                 conn_ord = I40IW_MAX_ORD_SIZE;
 135
 136         cm_node->ird_size = conn_ird;
 137         cm_node->ord_size = conn_ord;
 138 }
 139
 140 /**
 141  * i40iw_copy_ip_ntohl - change network to host ip
 142  * @dst: host ip
 143  * @src: big endian
 144  */
 145 void i40iw_copy_ip_ntohl(u32 *dst, __be32 *src)
 146 {
 147         *dst++ = ntohl(*src++);
 148         *dst++ = ntohl(*src++);
 149         *dst++ = ntohl(*src++);
 150         *dst = ntohl(*src);
 151 }
 152
 153 /**
 154  * i40iw_copy_ip_htonl - change host addr to network ip
 155  * @dst: host ip
 156  * @src: little endian
 157  */
 158 static inline void i40iw_copy_ip_htonl(__be32 *dst, u32 *src)
 159 {
 160         *dst++ = htonl(*src++);
 161         *dst++ = htonl(*src++);
 162         *dst++ = htonl(*src++);
 163         *dst = htonl(*src);
 164 }
 165
 166 /**
 167  * i40iw_fill_sockaddr4 - get addr info for passive connection
 168  * @cm_node: connection's node
 169  * @event: upper layer's cm event
 170  */
 171 static inline void i40iw_fill_sockaddr4(struct i40iw_cm_node *cm_node,
 172                                         struct iw_cm_event *event)
 173 {
 174         struct sockaddr_in *laddr = (struct sockaddr_in *)&event->local_addr;
 175         struct sockaddr_in *raddr = (struct sockaddr_in *)&event->remote_addr;
 176
 177         laddr->sin_family = AF_INET;
 178         raddr->sin_family = AF_INET;
 179
 180         laddr->sin_port = htons(cm_node->loc_port);
 181         raddr->sin_port = htons(cm_node->rem_port);
 182
 183         laddr->sin_addr.s_addr = htonl(cm_node->loc_addr[0]);
 184         raddr->sin_addr.s_addr = htonl(cm_node->rem_addr[0]);
 185 }
 186
 187 /**
 188  * i40iw_fill_sockaddr6 - get ipv6 addr info for passive side
 189  * @cm_node: connection's node
 190  * @event: upper layer's cm event
 191  */
 192 static inline void i40iw_fill_sockaddr6(struct i40iw_cm_node *cm_node,
 193                                         struct iw_cm_event *event)
 194 {
 195         struct sockaddr_in6 *laddr6 = (struct sockaddr_in6 *)&event->local_addr;
 196         struct sockaddr_in6 *raddr6 = (struct sockaddr_in6 *)&event->remote_addr;
 197
 198         laddr6->sin6_family = AF_INET6;
 199         raddr6->sin6_family = AF_INET6;
 200
 201         laddr6->sin6_port = htons(cm_node->loc_port);
 202         raddr6->sin6_port = htons(cm_node->rem_port);
 203
 204         i40iw_copy_ip_htonl(laddr6->sin6_addr.in6_u.u6_addr32,
 205                             cm_node->loc_addr);
 206         i40iw_copy_ip_htonl(raddr6->sin6_addr.in6_u.u6_addr32,
 207                             cm_node->rem_addr);
 208 }
 209
 210 /**
 211  * i40iw_get_addr_info
 212  * @cm_node: contains ip/tcp info
 213  * @cm_info: to get a copy of the cm_node ip/tcp info
 214 */
 215 static void i40iw_get_addr_info(struct i40iw_cm_node *cm_node,
 216                                 struct i40iw_cm_info *cm_info)
 217 {
 218         cm_info->ipv4 = cm_node->ipv4;
 219         cm_info->vlan_id = cm_node->vlan_id;
 220         memcpy(cm_info->loc_addr, cm_node->loc_addr, sizeof(cm_info->loc_addr));
 221         memcpy(cm_info->rem_addr, cm_node->rem_addr, sizeof(cm_info->rem_addr));
 222         cm_info->loc_port = cm_node->loc_port;
 223         cm_info->rem_port = cm_node->rem_port;
 224         cm_info->user_pri = cm_node->user_pri;
 225 }
 226
 227 /**
 228  * i40iw_get_cmevent_info - for cm event upcall
 229  * @cm_node: connection's node
 230  * @cm_id: upper layers cm struct for the event
 231  * @event: upper layer's cm event
 232  */
 233 static inline void i40iw_get_cmevent_info(struct i40iw_cm_node *cm_node,
 234                                           struct iw_cm_id *cm_id,
 235                                           struct iw_cm_event *event)
 236 {
 237         memcpy(&event->local_addr, &cm_id->m_local_addr,
 238                sizeof(event->local_addr));
 239         memcpy(&event->remote_addr, &cm_id->m_remote_addr,
 240                sizeof(event->remote_addr));
 241         if (cm_node) {
 242                 event->private_data = (void *)cm_node->pdata_buf;
 243                 event->private_data_len = (u8)cm_node->pdata.size;
 244                 event->ird = cm_node->ird_size;
 245                 event->ord = cm_node->ord_size;
 246         }
 247 }
 248
 249 /**
 250  * i40iw_send_cm_event - upcall cm's event handler
 251  * @cm_node: connection's node
 252  * @cm_id: upper layer's cm info struct
 253  * @type: Event type to indicate
 254  * @status: status for the event type
 255  */
 256 static int i40iw_send_cm_event(struct i40iw_cm_node *cm_node,
 257                                struct iw_cm_id *cm_id,
 258                                enum iw_cm_event_type type,
 259                                int status)
 260 {
 261         struct iw_cm_event event;
 262
 263         memset(&event, 0, sizeof(event));
 264         event.event = type;
 265         event.status = status;
 266         switch (type) {
 267         case IW_CM_EVENT_CONNECT_REQUEST:
 268                 if (cm_node->ipv4)
 269                         i40iw_fill_sockaddr4(cm_node, &event);
 270                 else
 271                         i40iw_fill_sockaddr6(cm_node, &event);
 272                 event.provider_data = (void *)cm_node;
 273                 event.private_data = (void *)cm_node->pdata_buf;
 274                 event.private_data_len = (u8)cm_node->pdata.size;
 275                 event.ird = cm_node->ird_size;
 276                 break;
 277         case IW_CM_EVENT_CONNECT_REPLY:
 278                 i40iw_get_cmevent_info(cm_node, cm_id, &event);
 279                 break;
 280         case IW_CM_EVENT_ESTABLISHED:
 281                 event.ird = cm_node->ird_size;
 282                 event.ord = cm_node->ord_size;
 283                 break;
 284         case IW_CM_EVENT_DISCONNECT:
 285                 break;
 286         case IW_CM_EVENT_CLOSE:
 287                 break;
 288         default:
 289                 i40iw_pr_err("event type received type = %d\n", type);
 290                 return -1;
 291         }
 292         return cm_id->event_handler(cm_id, &event);
 293 }
 294
 295 /**
 296  * i40iw_create_event - create cm event
 297  * @cm_node: connection's node
 298  * @type: Event type to generate
 299  */
 300 static struct i40iw_cm_event *i40iw_create_event(struct i40iw_cm_node *cm_node,
 301                                                  enum i40iw_cm_event_type type)
 302 {
 303         struct i40iw_cm_event *event;
 304
 305         if (!cm_node->cm_id)
 306                 return NULL;
 307
 308         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 309
 310         if (!event)
 311                 return NULL;
 312
 313         event->type = type;
 314         event->cm_node = cm_node;
 315         memcpy(event->cm_info.rem_addr, cm_node->rem_addr, sizeof(event->cm_info.rem_addr));
 316         memcpy(event->cm_info.loc_addr, cm_node->loc_addr, sizeof(event->cm_info.loc_addr));
 317         event->cm_info.rem_port = cm_node->rem_port;
 318         event->cm_info.loc_port = cm_node->loc_port;
 319         event->cm_info.cm_id = cm_node->cm_id;
 320
 321         i40iw_debug(cm_node->dev,
 322                     I40IW_DEBUG_CM,
 323                     "node=%p event=%p type=%u dst=%pI4 src=%pI4\n",
 324                     cm_node,
 325                     event,
 326                     type,
 327                     event->cm_info.loc_addr,
 328                     event->cm_info.rem_addr);
 329
 330         i40iw_cm_post_event(event);
 331         return event;
 332 }
 333
 334 /**
 335  * i40iw_free_retrans_entry - free send entry
 336  * @cm_node: connection's node
 337  */
 338 static void i40iw_free_retrans_entry(struct i40iw_cm_node *cm_node)
 339 {
 340         struct i40iw_device *iwdev = cm_node->iwdev;
 341         struct i40iw_timer_entry *send_entry;
 342
 343         send_entry = cm_node->send_entry;
 344         if (send_entry) {
 345                 cm_node->send_entry = NULL;
 346                 i40iw_free_sqbuf(&iwdev->vsi, (void *)send_entry->sqbuf);
 347                 kfree(send_entry);
 348                 atomic_dec(&cm_node->ref_count);
 349         }
 350 }
 351
 352 /**
 353  * i40iw_cleanup_retrans_entry - free send entry with lock
 354  * @cm_node: connection's node
 355  */
 356 static void i40iw_cleanup_retrans_entry(struct i40iw_cm_node *cm_node)
 357 {
 358         unsigned long flags;
 359
 360         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 361         i40iw_free_retrans_entry(cm_node);
 362         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 363 }
 364
 365 /**
 366  * i40iw_form_cm_frame - get a free packet and build frame
 367  * @cm_node: connection's node ionfo to use in frame
 368  * @options: pointer to options info
 369  * @hdr: pointer mpa header
 370  * @pdata: pointer to private data
 371  * @flags:  indicates FIN or ACK
 372  */
 373 static struct i40iw_puda_buf *i40iw_form_cm_frame(struct i40iw_cm_node *cm_node,
 374                                                   struct i40iw_kmem_info *options,
 375                                                   struct i40iw_kmem_info *hdr,
 376                                                   struct i40iw_kmem_info *pdata,
 377                                                   u8 flags)
 378 {
 379         struct i40iw_puda_buf *sqbuf;
 380         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
 381         u8 *buf;
 382
 383         struct tcphdr *tcph;
 384         struct iphdr *iph;
 385         struct ipv6hdr *ip6h;
 386         struct ethhdr *ethh;
 387         u16 packetsize;
 388         u16 eth_hlen = ETH_HLEN;
 389         u32 opts_len = 0;
 390         u32 pd_len = 0;
 391         u32 hdr_len = 0;
 392         u16 vtag;
 393
 394         sqbuf = i40iw_puda_get_bufpool(vsi->ilq);
 395         if (!sqbuf)
 396                 return NULL;
 397         buf = sqbuf->mem.va;
 398
 399         if (options)
 400                 opts_len = (u32)options->size;
 401
 402         if (hdr)
 403                 hdr_len = hdr->size;
 404
 405         if (pdata)
 406                 pd_len = pdata->size;
 407
 408         if (cm_node->vlan_id < VLAN_TAG_PRESENT)
 409                 eth_hlen += 4;
 410
 411         if (cm_node->ipv4)
 412                 packetsize = sizeof(*iph) + sizeof(*tcph);
 413         else
 414                 packetsize = sizeof(*ip6h) + sizeof(*tcph);
 415         packetsize += opts_len + hdr_len + pd_len;
 416
 417         memset(buf, 0x00, eth_hlen + packetsize);
 418
 419         sqbuf->totallen = packetsize + eth_hlen;
 420         sqbuf->maclen = eth_hlen;
 421         sqbuf->tcphlen = sizeof(*tcph) + opts_len;
 422         sqbuf->scratch = (void *)cm_node;
 423
 424         ethh = (struct ethhdr *)buf;
 425         buf += eth_hlen;
 426
 427         if (cm_node->ipv4) {
 428                 sqbuf->ipv4 = true;
 429
 430                 iph = (struct iphdr *)buf;
 431                 buf += sizeof(*iph);
 432                 tcph = (struct tcphdr *)buf;
 433                 buf += sizeof(*tcph);
 434
 435                 ether_addr_copy(ethh->h_dest, cm_node->rem_mac);
 436                 ether_addr_copy(ethh->h_source, cm_node->loc_mac);
 437                 if (cm_node->vlan_id < VLAN_TAG_PRESENT) {
 438                         ((struct vlan_ethhdr *)ethh)->h_vlan_proto = htons(ETH_P_8021Q);
 439                         vtag = (cm_node->user_pri << VLAN_PRIO_SHIFT) | cm_node->vlan_id;
 440                         ((struct vlan_ethhdr *)ethh)->h_vlan_TCI = htons(vtag);
 441
 442                         ((struct vlan_ethhdr *)ethh)->h_vlan_encapsulated_proto = htons(ETH_P_IP);
 443                 } else {
 444                         ethh->h_proto = htons(ETH_P_IP);
 445                 }
 446
 447                 iph->version = IPVERSION;
 448                 iph->ihl = 5;   /* 5 * 4Byte words, IP headr len */
 449                 iph->tos = cm_node->tos;
 450                 iph->tot_len = htons(packetsize);
 451                 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 452
 453                 iph->frag_off = htons(0x4000);
 454                 iph->ttl = 0x40;
 455                 iph->protocol = IPPROTO_TCP;
 456                 iph->saddr = htonl(cm_node->loc_addr[0]);
 457                 iph->daddr = htonl(cm_node->rem_addr[0]);
 458         } else {
 459                 sqbuf->ipv4 = false;
 460                 ip6h = (struct ipv6hdr *)buf;
 461                 buf += sizeof(*ip6h);
 462                 tcph = (struct tcphdr *)buf;
 463                 buf += sizeof(*tcph);
 464
 465                 ether_addr_copy(ethh->h_dest, cm_node->rem_mac);
 466                 ether_addr_copy(ethh->h_source, cm_node->loc_mac);
 467                 if (cm_node->vlan_id < VLAN_TAG_PRESENT) {
 468                         ((struct vlan_ethhdr *)ethh)->h_vlan_proto = htons(ETH_P_8021Q);
 469                         vtag = (cm_node->user_pri << VLAN_PRIO_SHIFT) | cm_node->vlan_id;
 470                         ((struct vlan_ethhdr *)ethh)->h_vlan_TCI = htons(vtag);
 471                         ((struct vlan_ethhdr *)ethh)->h_vlan_encapsulated_proto = htons(ETH_P_IPV6);
 472                 } else {
 473                         ethh->h_proto = htons(ETH_P_IPV6);
 474                 }
 475                 ip6h->version = 6;
 476                 ip6h->priority = cm_node->tos >> 4;
 477                 ip6h->flow_lbl[0] = cm_node->tos << 4;
 478                 ip6h->flow_lbl[1] = 0;
 479                 ip6h->flow_lbl[2] = 0;
 480                 ip6h->payload_len = htons(packetsize - sizeof(*ip6h));
 481                 ip6h->nexthdr = 6;
 482                 ip6h->hop_limit = 128;
 483                 i40iw_copy_ip_htonl(ip6h->saddr.in6_u.u6_addr32,
 484                                     cm_node->loc_addr);
 485                 i40iw_copy_ip_htonl(ip6h->daddr.in6_u.u6_addr32,
 486                                     cm_node->rem_addr);
 487         }
 488
 489         tcph->source = htons(cm_node->loc_port);
 490         tcph->dest = htons(cm_node->rem_port);
 491
 492         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 493
 494         if (flags & SET_ACK) {
 495                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 496                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 497                 tcph->ack = 1;
 498         } else {
 499                 tcph->ack_seq = 0;
 500         }
 501
 502         if (flags & SET_SYN) {
 503                 cm_node->tcp_cntxt.loc_seq_num++;
 504                 tcph->syn = 1;
 505         } else {
 506                 cm_node->tcp_cntxt.loc_seq_num += hdr_len + pd_len;
 507         }
 508
 509         if (flags & SET_FIN) {
 510                 cm_node->tcp_cntxt.loc_seq_num++;
 511                 tcph->fin = 1;
 512         }
 513
 514         if (flags & SET_RST)
 515                 tcph->rst = 1;
 516
 517         tcph->doff = (u16)((sizeof(*tcph) + opts_len + 3) >> 2);
 518         sqbuf->tcphlen = tcph->doff << 2;
 519         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 520         tcph->urg_ptr = 0;
 521
 522         if (opts_len) {
 523                 memcpy(buf, options->addr, opts_len);
 524                 buf += opts_len;
 525         }
 526
 527         if (hdr_len) {
 528                 memcpy(buf, hdr->addr, hdr_len);
 529                 buf += hdr_len;
 530         }
 531
 532         if (pdata && pdata->addr)
 533                 memcpy(buf, pdata->addr, pdata->size);
 534
 535         atomic_set(&sqbuf->refcount, 1);
 536
 537         return sqbuf;
 538 }
 539
 540 /**
 541  * i40iw_send_reset - Send RST packet
 542  * @cm_node: connection's node
 543  */
 544 static int i40iw_send_reset(struct i40iw_cm_node *cm_node)
 545 {
 546         struct i40iw_puda_buf *sqbuf;
 547         int flags = SET_RST | SET_ACK;
 548
 549         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, flags);
 550         if (!sqbuf) {
 551                 i40iw_pr_err("no sqbuf\n");
 552                 return -1;
 553         }
 554
 555         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 0, 1);
 556 }
 557
 558 /**
 559  * i40iw_active_open_err - send event for active side cm error
 560  * @cm_node: connection's node
 561  * @reset: Flag to send reset or not
 562  */
 563 static void i40iw_active_open_err(struct i40iw_cm_node *cm_node, bool reset)
 564 {
 565         i40iw_cleanup_retrans_entry(cm_node);
 566         cm_node->cm_core->stats_connect_errs++;
 567         if (reset) {
 568                 i40iw_debug(cm_node->dev,
 569                             I40IW_DEBUG_CM,
 570                             "%s cm_node=%p state=%d\n",
 571                             __func__,
 572                             cm_node,
 573                             cm_node->state);
 574                 atomic_inc(&cm_node->ref_count);
 575                 i40iw_send_reset(cm_node);
 576         }
 577
 578         cm_node->state = I40IW_CM_STATE_CLOSED;
 579         i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
 580 }
 581
 582 /**
 583  * i40iw_passive_open_err - handle passive side cm error
 584  * @cm_node: connection's node
 585  * @reset: send reset or just free cm_node
 586  */
 587 static void i40iw_passive_open_err(struct i40iw_cm_node *cm_node, bool reset)
 588 {
 589         i40iw_cleanup_retrans_entry(cm_node);
 590         cm_node->cm_core->stats_passive_errs++;
 591         cm_node->state = I40IW_CM_STATE_CLOSED;
 592         i40iw_debug(cm_node->dev,
 593                     I40IW_DEBUG_CM,
 594                     "%s cm_node=%p state =%d\n",
 595                     __func__,
 596                     cm_node,
 597                     cm_node->state);
 598         if (reset)
 599                 i40iw_send_reset(cm_node);
 600         else
 601                 i40iw_rem_ref_cm_node(cm_node);
 602 }
 603
 604 /**
 605  * i40iw_event_connect_error - to create connect error event
 606  * @event: cm information for connect event
 607  */
 608 static void i40iw_event_connect_error(struct i40iw_cm_event *event)
 609 {
 610         struct i40iw_qp *iwqp;
 611         struct iw_cm_id *cm_id;
 612
 613         cm_id = event->cm_node->cm_id;
 614         if (!cm_id)
 615                 return;
 616
 617         iwqp = cm_id->provider_data;
 618
 619         if (!iwqp || !iwqp->iwdev)
 620                 return;
 621
 622         iwqp->cm_id = NULL;
 623         cm_id->provider_data = NULL;
 624         i40iw_send_cm_event(event->cm_node, cm_id,
 625                             IW_CM_EVENT_CONNECT_REPLY,
 626                             -ECONNRESET);
 627         cm_id->rem_ref(cm_id);
 628         i40iw_rem_ref_cm_node(event->cm_node);
 629 }
 630
 631 /**
 632  * i40iw_process_options
 633  * @cm_node: connection's node
 634  * @optionsloc: point to start of options
 635  * @optionsize: size of all options
 636  * @syn_packet: flag if syn packet
 637  */
 638 static int i40iw_process_options(struct i40iw_cm_node *cm_node,
 639                                  u8 *optionsloc,
 640                                  u32 optionsize,
 641                                  u32 syn_packet)
 642 {
 643         u32 tmp;
 644         u32 offset = 0;
 645         union all_known_options *all_options;
 646         char got_mss_option = 0;
 647
 648         while (offset < optionsize) {
 649                 all_options = (union all_known_options *)(optionsloc + offset);
 650                 switch (all_options->as_base.optionnum) {
 651                 case OPTION_NUMBER_END:
 652                         offset = optionsize;
 653                         break;
 654                 case OPTION_NUMBER_NONE:
 655                         offset += 1;
 656                         continue;
 657                 case OPTION_NUMBER_MSS:
 658                         i40iw_debug(cm_node->dev,
 659                                     I40IW_DEBUG_CM,
 660                                     "%s: MSS Length: %d Offset: %d Size: %d\n",
 661                                     __func__,
 662                                     all_options->as_mss.length,
 663                                     offset,
 664                                     optionsize);
 665                         got_mss_option = 1;
 666                         if (all_options->as_mss.length != 4)
 667                                 return -1;
 668                         tmp = ntohs(all_options->as_mss.mss);
 669                         if (tmp > 0 && tmp < cm_node->tcp_cntxt.mss)
 670                                 cm_node->tcp_cntxt.mss = tmp;
 671                         break;
 672                 case OPTION_NUMBER_WINDOW_SCALE:
 673                         cm_node->tcp_cntxt.snd_wscale =
 674                             all_options->as_windowscale.shiftcount;
 675                         break;
 676                 default:
 677                         i40iw_debug(cm_node->dev,
 678                                     I40IW_DEBUG_CM,
 679                                     "TCP Option not understood: %x\n",
 680                                     all_options->as_base.optionnum);
 681                         break;
 682                 }
 683                 offset += all_options->as_base.length;
 684         }
 685         if (!got_mss_option && syn_packet)
 686                 cm_node->tcp_cntxt.mss = I40IW_CM_DEFAULT_MSS;
 687         return 0;
 688 }
 689
 690 /**
 691  * i40iw_handle_tcp_options -
 692  * @cm_node: connection's node
 693  * @tcph: pointer tcp header
 694  * @optionsize: size of options rcvd
 695  * @passive: active or passive flag
 696  */
 697 static int i40iw_handle_tcp_options(struct i40iw_cm_node *cm_node,
 698                                     struct tcphdr *tcph,
 699                                     int optionsize,
 700                                     int passive)
 701 {
 702         u8 *optionsloc = (u8 *)&tcph[1];
 703
 704         if (optionsize) {
 705                 if (i40iw_process_options(cm_node,
 706                                           optionsloc,
 707                                           optionsize,
 708                                           (u32)tcph->syn)) {
 709                         i40iw_debug(cm_node->dev,
 710                                     I40IW_DEBUG_CM,
 711                                     "%s: Node %p, Sending RESET\n",
 712                                     __func__,
 713                                     cm_node);
 714                         if (passive)
 715                                 i40iw_passive_open_err(cm_node, true);
 716                         else
 717                                 i40iw_active_open_err(cm_node, true);
 718                         return -1;
 719                 }
 720         }
 721
 722         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
 723             cm_node->tcp_cntxt.snd_wscale;
 724
 725         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
 726                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
 727         return 0;
 728 }
 729
 730 /**
 731  * i40iw_build_mpa_v1 - build a MPA V1 frame
 732  * @cm_node: connection's node
 733  * @mpa_key: to do read0 or write0
 734  */
 735 static void i40iw_build_mpa_v1(struct i40iw_cm_node *cm_node,
 736                                void *start_addr,
 737                                u8 mpa_key)
 738 {
 739         struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
 740
 741         switch (mpa_key) {
 742         case MPA_KEY_REQUEST:
 743                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
 744                 break;
 745         case MPA_KEY_REPLY:
 746                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
 747                 break;
 748         default:
 749                 break;
 750         }
 751         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
 752         mpa_frame->rev = cm_node->mpa_frame_rev;
 753         mpa_frame->priv_data_len = htons(cm_node->pdata.size);
 754 }
 755
 756 /**
 757  * i40iw_build_mpa_v2 - build a MPA V2 frame
 758  * @cm_node: connection's node
 759  * @start_addr: buffer start address
 760  * @mpa_key: to do read0 or write0
 761  */
 762 static void i40iw_build_mpa_v2(struct i40iw_cm_node *cm_node,
 763                                void *start_addr,
 764                                u8 mpa_key)
 765 {
 766         struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
 767         struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
 768         u16 ctrl_ird, ctrl_ord;
 769
 770         /* initialize the upper 5 bytes of the frame */
 771         i40iw_build_mpa_v1(cm_node, start_addr, mpa_key);
 772         mpa_frame->flags |= IETF_MPA_V2_FLAG;
 773         mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
 774
 775         /* initialize RTR msg */
 776         if (cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
 777                 ctrl_ird = IETF_NO_IRD_ORD;
 778                 ctrl_ord = IETF_NO_IRD_ORD;
 779         } else {
 780                 ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
 781                         IETF_NO_IRD_ORD : cm_node->ird_size;
 782                 ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
 783                         IETF_NO_IRD_ORD : cm_node->ord_size;
 784         }
 785
 786         ctrl_ird |= IETF_PEER_TO_PEER;
 787
 788         switch (mpa_key) {
 789         case MPA_KEY_REQUEST:
 790                 ctrl_ord |= IETF_RDMA0_WRITE;
 791                 ctrl_ord |= IETF_RDMA0_READ;
 792                 break;
 793         case MPA_KEY_REPLY:
 794                 switch (cm_node->send_rdma0_op) {
 795                 case SEND_RDMA_WRITE_ZERO:
 796                         ctrl_ord |= IETF_RDMA0_WRITE;
 797                         break;
 798                 case SEND_RDMA_READ_ZERO:
 799                         ctrl_ord |= IETF_RDMA0_READ;
 800                         break;
 801                 }
 802                 break;
 803         default:
 804                 break;
 805         }
 806         rtr_msg->ctrl_ird = htons(ctrl_ird);
 807         rtr_msg->ctrl_ord = htons(ctrl_ord);
 808 }
 809
 810 /**
 811  * i40iw_cm_build_mpa_frame - build mpa frame for mpa version 1 or version 2
 812  * @cm_node: connection's node
 813  * @mpa: mpa: data buffer
 814  * @mpa_key: to do read0 or write0
 815  */
 816 static int i40iw_cm_build_mpa_frame(struct i40iw_cm_node *cm_node,
 817                                     struct i40iw_kmem_info *mpa,
 818                                     u8 mpa_key)
 819 {
 820         int hdr_len = 0;
 821
 822         switch (cm_node->mpa_frame_rev) {
 823         case IETF_MPA_V1:
 824                 hdr_len = sizeof(struct ietf_mpa_v1);
 825                 i40iw_build_mpa_v1(cm_node, mpa->addr, mpa_key);
 826                 break;
 827         case IETF_MPA_V2:
 828                 hdr_len = sizeof(struct ietf_mpa_v2);
 829                 i40iw_build_mpa_v2(cm_node, mpa->addr, mpa_key);
 830                 break;
 831         default:
 832                 break;
 833         }
 834
 835         return hdr_len;
 836 }
 837
 838 /**
 839  * i40iw_send_mpa_request - active node send mpa request to passive node
 840  * @cm_node: connection's node
 841  */
 842 static int i40iw_send_mpa_request(struct i40iw_cm_node *cm_node)
 843 {
 844         struct i40iw_puda_buf *sqbuf;
 845
 846         if (!cm_node) {
 847                 i40iw_pr_err("cm_node == NULL\n");
 848                 return -1;
 849         }
 850
 851         cm_node->mpa_hdr.addr = &cm_node->mpa_frame;
 852         cm_node->mpa_hdr.size = i40iw_cm_build_mpa_frame(cm_node,
 853                                                          &cm_node->mpa_hdr,
 854                                                          MPA_KEY_REQUEST);
 855         if (!cm_node->mpa_hdr.size) {
 856                 i40iw_pr_err("mpa size = %d\n", cm_node->mpa_hdr.size);
 857                 return -1;
 858         }
 859
 860         sqbuf = i40iw_form_cm_frame(cm_node,
 861                                     NULL,
 862                                     &cm_node->mpa_hdr,
 863                                     &cm_node->pdata,
 864                                     SET_ACK);
 865         if (!sqbuf) {
 866                 i40iw_pr_err("sq_buf == NULL\n");
 867                 return -1;
 868         }
 869         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
 870 }
 871
 872 /**
 873  * i40iw_send_mpa_reject -
 874  * @cm_node: connection's node
 875  * @pdata: reject data for connection
 876  * @plen: length of reject data
 877  */
 878 static int i40iw_send_mpa_reject(struct i40iw_cm_node *cm_node,
 879                                  const void *pdata,
 880                                  u8 plen)
 881 {
 882         struct i40iw_puda_buf *sqbuf;
 883         struct i40iw_kmem_info priv_info;
 884
 885         cm_node->mpa_hdr.addr = &cm_node->mpa_frame;
 886         cm_node->mpa_hdr.size = i40iw_cm_build_mpa_frame(cm_node,
 887                                                          &cm_node->mpa_hdr,
 888                                                          MPA_KEY_REPLY);
 889
 890         cm_node->mpa_frame.flags |= IETF_MPA_FLAGS_REJECT;
 891         priv_info.addr = (void *)pdata;
 892         priv_info.size = plen;
 893
 894         sqbuf = i40iw_form_cm_frame(cm_node,
 895                                     NULL,
 896                                     &cm_node->mpa_hdr,
 897                                     &priv_info,
 898                                     SET_ACK | SET_FIN);
 899         if (!sqbuf) {
 900                 i40iw_pr_err("no sqbuf\n");
 901                 return -ENOMEM;
 902         }
 903         cm_node->state = I40IW_CM_STATE_FIN_WAIT1;
 904         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
 905 }
 906
 907 /**
 908  * recv_mpa - process an IETF MPA frame
 909  * @cm_node: connection's node
 910  * @buffer: Data pointer
 911  * @type: to return accept or reject
 912  * @len: Len of mpa buffer
 913  */
 914 static int i40iw_parse_mpa(struct i40iw_cm_node *cm_node, u8 *buffer, u32 *type, u32 len)
 915 {
 916         struct ietf_mpa_v1 *mpa_frame;
 917         struct ietf_mpa_v2 *mpa_v2_frame;
 918         struct ietf_rtr_msg *rtr_msg;
 919         int mpa_hdr_len;
 920         int priv_data_len;
 921
 922         *type = I40IW_MPA_REQUEST_ACCEPT;
 923
 924         if (len < sizeof(struct ietf_mpa_v1)) {
 925                 i40iw_pr_err("ietf buffer small (%x)\n", len);
 926                 return -1;
 927         }
 928
 929         mpa_frame = (struct ietf_mpa_v1 *)buffer;
 930         mpa_hdr_len = sizeof(struct ietf_mpa_v1);
 931         priv_data_len = ntohs(mpa_frame->priv_data_len);
 932
 933         if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
 934                 i40iw_pr_err("large pri_data %d\n", priv_data_len);
 935                 return -1;
 936         }
 937         if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
 938                 i40iw_pr_err("unsupported mpa rev = %d\n", mpa_frame->rev);
 939                 return -1;
 940         }
 941         if (mpa_frame->rev > cm_node->mpa_frame_rev) {
 942                 i40iw_pr_err("rev %d\n", mpa_frame->rev);
 943                 return -1;
 944         }
 945         cm_node->mpa_frame_rev = mpa_frame->rev;
 946
 947         if (cm_node->state != I40IW_CM_STATE_MPAREQ_SENT) {
 948                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
 949                         i40iw_pr_err("Unexpected MPA Key received\n");
 950                         return -1;
 951                 }
 952         } else {
 953                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
 954                         i40iw_pr_err("Unexpected MPA Key received\n");
 955                         return -1;
 956                 }
 957         }
 958
 959         if (priv_data_len + mpa_hdr_len > len) {
 960                 i40iw_pr_err("ietf buffer len(%x + %x != %x)\n",
 961                              priv_data_len, mpa_hdr_len, len);
 962                 return -1;
 963         }
 964         if (len > MAX_CM_BUFFER) {
 965                 i40iw_pr_err("ietf buffer large len = %d\n", len);
 966                 return -1;
 967         }
 968
 969         switch (mpa_frame->rev) {
 970         case IETF_MPA_V2:{
 971                         u16 ird_size;
 972                         u16 ord_size;
 973                         u16 ctrl_ord;
 974                         u16 ctrl_ird;
 975
 976                         mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
 977                         mpa_hdr_len += IETF_RTR_MSG_SIZE;
 978                         rtr_msg = &mpa_v2_frame->rtr_msg;
 979
 980                         /* parse rtr message */
 981                         ctrl_ord = ntohs(rtr_msg->ctrl_ord);
 982                         ctrl_ird = ntohs(rtr_msg->ctrl_ird);
 983                         ird_size = ctrl_ird & IETF_NO_IRD_ORD;
 984                         ord_size = ctrl_ord & IETF_NO_IRD_ORD;
 985
 986                         if (!(ctrl_ird & IETF_PEER_TO_PEER))
 987                                 return -1;
 988
 989                         if (ird_size == IETF_NO_IRD_ORD || ord_size == IETF_NO_IRD_ORD) {
 990                                 cm_node->mpav2_ird_ord = IETF_NO_IRD_ORD;
 991                                 goto negotiate_done;
 992                         }
 993
 994                         if (cm_node->state != I40IW_CM_STATE_MPAREQ_SENT) {
 995                                 /* responder */
 996                                 if (!ord_size && (ctrl_ord & IETF_RDMA0_READ))
 997                                         cm_node->ird_size = 1;
 998                                 if (cm_node->ord_size > ird_size)
 999                                         cm_node->ord_size = ird_size;
1000                         } else {
1001                                 /* initiator */
1002                                 if (!ird_size && (ctrl_ord & IETF_RDMA0_READ))
1003                                         return -1;
1004                                 if (cm_node->ord_size > ird_size)
1005                                         cm_node->ord_size = ird_size;
1006
1007                                 if (cm_node->ird_size < ord_size)
1008                                         /* no resources available */
1009                                         return -1;
1010                         }
1011
1012 negotiate_done:
1013                         if (ctrl_ord & IETF_RDMA0_READ)
1014                                 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1015                         else if (ctrl_ord & IETF_RDMA0_WRITE)
1016                                 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
1017                         else    /* Not supported RDMA0 operation */
1018                                 return -1;
1019                         i40iw_debug(cm_node->dev, I40IW_DEBUG_CM,
1020                                     "MPAV2: Negotiated ORD: %d, IRD: %d\n",
1021                                     cm_node->ord_size, cm_node->ird_size);
1022                         break;
1023                 }
1024                 break;
1025         case IETF_MPA_V1:
1026         default:
1027                 break;
1028         }
1029
1030         memcpy(cm_node->pdata_buf, buffer + mpa_hdr_len, priv_data_len);
1031         cm_node->pdata.size = priv_data_len;
1032
1033         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
1034                 *type = I40IW_MPA_REQUEST_REJECT;
1035
1036         if (mpa_frame->flags & IETF_MPA_FLAGS_MARKERS)
1037                 cm_node->snd_mark_en = true;
1038
1039         return 0;
1040 }
1041
1042 /**
1043  * i40iw_schedule_cm_timer
1044  * @@cm_node: connection's node
1045  * @sqbuf: buffer to send
1046  * @type: if it is send or close
1047  * @send_retrans: if rexmits to be done
1048  * @close_when_complete: is cm_node to be removed
1049  *
1050  * note - cm_node needs to be protected before calling this. Encase in:
1051  *              i40iw_rem_ref_cm_node(cm_core, cm_node);
1052  *              i40iw_schedule_cm_timer(...)
1053  *              atomic_inc(&cm_node->ref_count);
1054  */
1055 int i40iw_schedule_cm_timer(struct i40iw_cm_node *cm_node,
1056                             struct i40iw_puda_buf *sqbuf,
1057                             enum i40iw_timer_type type,
1058                             int send_retrans,
1059                             int close_when_complete)
1060 {
1061         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
1062         struct i40iw_cm_core *cm_core = cm_node->cm_core;
1063         struct i40iw_timer_entry *new_send;
1064         int ret = 0;
1065         u32 was_timer_set;
1066         unsigned long flags;
1067
1068         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
1069         if (!new_send) {
1070                 if (type != I40IW_TIMER_TYPE_CLOSE)
1071                         i40iw_free_sqbuf(vsi, (void *)sqbuf);
1072                 return -ENOMEM;
1073         }
1074         new_send->retrycount = I40IW_DEFAULT_RETRYS;
1075         new_send->retranscount = I40IW_DEFAULT_RETRANS;
1076         new_send->sqbuf = sqbuf;
1077         new_send->timetosend = jiffies;
1078         new_send->type = type;
1079         new_send->send_retrans = send_retrans;
1080         new_send->close_when_complete = close_when_complete;
1081
1082         if (type == I40IW_TIMER_TYPE_CLOSE) {
1083                 new_send->timetosend += (HZ / 10);
1084                 if (cm_node->close_entry) {
1085                         kfree(new_send);
1086                         i40iw_pr_err("already close entry\n");
1087                         return -EINVAL;
1088                 }
1089                 cm_node->close_entry = new_send;
1090         }
1091
1092         if (type == I40IW_TIMER_TYPE_SEND) {
1093                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1094                 cm_node->send_entry = new_send;
1095                 atomic_inc(&cm_node->ref_count);
1096                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1097                 new_send->timetosend = jiffies + I40IW_RETRY_TIMEOUT;
1098
1099                 atomic_inc(&sqbuf->refcount);
1100                 i40iw_puda_send_buf(vsi->ilq, sqbuf);
1101                 if (!send_retrans) {
1102                         i40iw_cleanup_retrans_entry(cm_node);
1103                         if (close_when_complete)
1104                                 i40iw_rem_ref_cm_node(cm_node);
1105                         return ret;
1106                 }
1107         }
1108
1109         spin_lock_irqsave(&cm_core->ht_lock, flags);
1110         was_timer_set = timer_pending(&cm_core->tcp_timer);
1111
1112         if (!was_timer_set) {
1113                 cm_core->tcp_timer.expires = new_send->timetosend;
1114                 add_timer(&cm_core->tcp_timer);
1115         }
1116         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1117
1118         return ret;
1119 }
1120
1121 /**
1122  * i40iw_retrans_expired - Could not rexmit the packet
1123  * @cm_node: connection's node
1124  */
1125 static void i40iw_retrans_expired(struct i40iw_cm_node *cm_node)
1126 {
1127         struct iw_cm_id *cm_id = cm_node->cm_id;
1128         enum i40iw_cm_node_state state = cm_node->state;
1129
1130         cm_node->state = I40IW_CM_STATE_CLOSED;
1131         switch (state) {
1132         case I40IW_CM_STATE_SYN_RCVD:
1133         case I40IW_CM_STATE_CLOSING:
1134                 i40iw_rem_ref_cm_node(cm_node);
1135                 break;
1136         case I40IW_CM_STATE_FIN_WAIT1:
1137         case I40IW_CM_STATE_LAST_ACK:
1138                 if (cm_node->cm_id)
1139                         cm_id->rem_ref(cm_id);
1140                 i40iw_send_reset(cm_node);
1141                 break;
1142         default:
1143                 atomic_inc(&cm_node->ref_count);
1144                 i40iw_send_reset(cm_node);
1145                 i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
1146                 break;
1147         }
1148 }
1149
1150 /**
1151  * i40iw_handle_close_entry - for handling retry/timeouts
1152  * @cm_node: connection's node
1153  * @rem_node: flag for remove cm_node
1154  */
1155 static void i40iw_handle_close_entry(struct i40iw_cm_node *cm_node, u32 rem_node)
1156 {
1157         struct i40iw_timer_entry *close_entry = cm_node->close_entry;
1158         struct iw_cm_id *cm_id = cm_node->cm_id;
1159         struct i40iw_qp *iwqp;
1160         unsigned long flags;
1161
1162         if (!close_entry)
1163                 return;
1164         iwqp = (struct i40iw_qp *)close_entry->sqbuf;
1165         if (iwqp) {
1166                 spin_lock_irqsave(&iwqp->lock, flags);
1167                 if (iwqp->cm_id) {
1168                         iwqp->hw_tcp_state = I40IW_TCP_STATE_CLOSED;
1169                         iwqp->hw_iwarp_state = I40IW_QP_STATE_ERROR;
1170                         iwqp->last_aeq = I40IW_AE_RESET_SENT;
1171                         iwqp->ibqp_state = IB_QPS_ERR;
1172                         spin_unlock_irqrestore(&iwqp->lock, flags);
1173                         i40iw_cm_disconn(iwqp);
1174                 } else {
1175                         spin_unlock_irqrestore(&iwqp->lock, flags);
1176                 }
1177         } else if (rem_node) {
1178                 /* TIME_WAIT state */
1179                 i40iw_rem_ref_cm_node(cm_node);
1180         }
1181         if (cm_id)
1182                 cm_id->rem_ref(cm_id);
1183         kfree(close_entry);
1184         cm_node->close_entry = NULL;
1185 }
1186
1187 /**
1188  * i40iw_cm_timer_tick - system's timer expired callback
1189  * @pass: Pointing to cm_core
1190  */
1191 static void i40iw_cm_timer_tick(struct timer_list *t)
1192 {
1193         unsigned long nexttimeout = jiffies + I40IW_LONG_TIME;
1194         struct i40iw_cm_node *cm_node;
1195         struct i40iw_timer_entry *send_entry, *close_entry;
1196         struct list_head *list_core_temp;
1197         struct i40iw_sc_vsi *vsi;
1198         struct list_head *list_node;
1199         struct i40iw_cm_core *cm_core = from_timer(cm_core, t, tcp_timer);
1200         u32 settimer = 0;
1201         unsigned long timetosend;
1202         unsigned long flags;
1203
1204         struct list_head timer_list;
1205
1206         INIT_LIST_HEAD(&timer_list);
1207         spin_lock_irqsave(&cm_core->ht_lock, flags);
1208
1209         list_for_each_safe(list_node, list_core_temp, &cm_core->connected_nodes) {
1210                 cm_node = container_of(list_node, struct i40iw_cm_node, list);
1211                 if (cm_node->close_entry || cm_node->send_entry) {
1212                         atomic_inc(&cm_node->ref_count);
1213                         list_add(&cm_node->timer_entry, &timer_list);
1214                 }
1215         }
1216         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1217
1218         list_for_each_safe(list_node, list_core_temp, &timer_list) {
1219                 cm_node = container_of(list_node,
1220                                        struct i40iw_cm_node,
1221                                        timer_entry);
1222                 close_entry = cm_node->close_entry;
1223
1224                 if (close_entry) {
1225                         if (time_after(close_entry->timetosend, jiffies)) {
1226                                 if (nexttimeout > close_entry->timetosend ||
1227                                     !settimer) {
1228                                         nexttimeout = close_entry->timetosend;
1229                                         settimer = 1;
1230                                 }
1231                         } else {
1232                                 i40iw_handle_close_entry(cm_node, 1);
1233                         }
1234                 }
1235
1236                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1237
1238                 send_entry = cm_node->send_entry;
1239                 if (!send_entry)
1240                         goto done;
1241                 if (time_after(send_entry->timetosend, jiffies)) {
1242                         if (cm_node->state != I40IW_CM_STATE_OFFLOADED) {
1243                                 if ((nexttimeout > send_entry->timetosend) ||
1244                                     !settimer) {
1245                                         nexttimeout = send_entry->timetosend;
1246                                         settimer = 1;
1247                                 }
1248                         } else {
1249                                 i40iw_free_retrans_entry(cm_node);
1250                         }
1251                         goto done;
1252                 }
1253
1254                 if ((cm_node->state == I40IW_CM_STATE_OFFLOADED) ||
1255                     (cm_node->state == I40IW_CM_STATE_CLOSED)) {
1256                         i40iw_free_retrans_entry(cm_node);
1257                         goto done;
1258                 }
1259
1260                 if (!send_entry->retranscount || !send_entry->retrycount) {
1261                         i40iw_free_retrans_entry(cm_node);
1262
1263                         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1264                         i40iw_retrans_expired(cm_node);
1265                         cm_node->state = I40IW_CM_STATE_CLOSED;
1266                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1267                         goto done;
1268                 }
1269                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1270
1271                 vsi = &cm_node->iwdev->vsi;
1272
1273                 if (!cm_node->ack_rcvd) {
1274                         atomic_inc(&send_entry->sqbuf->refcount);
1275                         i40iw_puda_send_buf(vsi->ilq, send_entry->sqbuf);
1276                         cm_node->cm_core->stats_pkt_retrans++;
1277                 }
1278                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1279                 if (send_entry->send_retrans) {
1280                         send_entry->retranscount--;
1281                         timetosend = (I40IW_RETRY_TIMEOUT <<
1282                                       (I40IW_DEFAULT_RETRANS -
1283                                        send_entry->retranscount));
1284
1285                         send_entry->timetosend = jiffies +
1286                             min(timetosend, I40IW_MAX_TIMEOUT);
1287                         if (nexttimeout > send_entry->timetosend || !settimer) {
1288                                 nexttimeout = send_entry->timetosend;
1289                                 settimer = 1;
1290                         }
1291                 } else {
1292                         int close_when_complete;
1293
1294                         close_when_complete = send_entry->close_when_complete;
1295                         i40iw_debug(cm_node->dev,
1296                                     I40IW_DEBUG_CM,
1297                                     "cm_node=%p state=%d\n",
1298                                     cm_node,
1299                                     cm_node->state);
1300                         i40iw_free_retrans_entry(cm_node);
1301                         if (close_when_complete)
1302                                 i40iw_rem_ref_cm_node(cm_node);
1303                 }
1304 done:
1305                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1306                 i40iw_rem_ref_cm_node(cm_node);
1307         }
1308
1309         if (settimer) {
1310                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1311                 if (!timer_pending(&cm_core->tcp_timer)) {
1312                         cm_core->tcp_timer.expires = nexttimeout;
1313                         add_timer(&cm_core->tcp_timer);
1314                 }
1315                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1316         }
1317 }
1318
1319 /**
1320  * i40iw_send_syn - send SYN packet
1321  * @cm_node: connection's node
1322  * @sendack: flag to set ACK bit or not
1323  */
1324 int i40iw_send_syn(struct i40iw_cm_node *cm_node, u32 sendack)
1325 {
1326         struct i40iw_puda_buf *sqbuf;
1327         int flags = SET_SYN;
1328         char optionsbuffer[sizeof(struct option_mss) +
1329                            sizeof(struct option_windowscale) +
1330                            sizeof(struct option_base) + TCP_OPTIONS_PADDING];
1331         struct i40iw_kmem_info opts;
1332
1333         int optionssize = 0;
1334         /* Sending MSS option */
1335         union all_known_options *options;
1336
1337         opts.addr = optionsbuffer;
1338         if (!cm_node) {
1339                 i40iw_pr_err("no cm_node\n");
1340                 return -EINVAL;
1341         }
1342
1343         options = (union all_known_options *)&optionsbuffer[optionssize];
1344         options->as_mss.optionnum = OPTION_NUMBER_MSS;
1345         options->as_mss.length = sizeof(struct option_mss);
1346         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
1347         optionssize += sizeof(struct option_mss);
1348
1349         options = (union all_known_options *)&optionsbuffer[optionssize];
1350         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
1351         options->as_windowscale.length = sizeof(struct option_windowscale);
1352         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
1353         optionssize += sizeof(struct option_windowscale);
1354         options = (union all_known_options *)&optionsbuffer[optionssize];
1355         options->as_end = OPTION_NUMBER_END;
1356         optionssize += 1;
1357
1358         if (sendack)
1359                 flags |= SET_ACK;
1360
1361         opts.size = optionssize;
1362
1363         sqbuf = i40iw_form_cm_frame(cm_node, &opts, NULL, NULL, flags);
1364         if (!sqbuf) {
1365                 i40iw_pr_err("no sqbuf\n");
1366                 return -1;
1367         }
1368         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
1369 }
1370
1371 /**
1372  * i40iw_send_ack - Send ACK packet
1373  * @cm_node: connection's node
1374  */
1375 static void i40iw_send_ack(struct i40iw_cm_node *cm_node)
1376 {
1377         struct i40iw_puda_buf *sqbuf;
1378         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
1379
1380         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, SET_ACK);
1381         if (sqbuf)
1382                 i40iw_puda_send_buf(vsi->ilq, sqbuf);
1383         else
1384                 i40iw_pr_err("no sqbuf\n");
1385 }
1386
1387 /**
1388  * i40iw_send_fin - Send FIN pkt
1389  * @cm_node: connection's node
1390  */
1391 static int i40iw_send_fin(struct i40iw_cm_node *cm_node)
1392 {
1393         struct i40iw_puda_buf *sqbuf;
1394
1395         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, SET_ACK | SET_FIN);
1396         if (!sqbuf) {
1397                 i40iw_pr_err("no sqbuf\n");
1398                 return -1;
1399         }
1400         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
1401 }
1402
1403 /**
1404  * i40iw_find_node - find a cm node that matches the reference cm node
1405  * @cm_core: cm's core
1406  * @rem_port: remote tcp port num
1407  * @rem_addr: remote ip addr
1408  * @loc_port: local tcp port num
1409  * @loc_addr: loc ip addr
1410  * @add_refcnt: flag to increment refcount of cm_node
1411  */
1412 struct i40iw_cm_node *i40iw_find_node(struct i40iw_cm_core *cm_core,
1413                                       u16 rem_port,
1414                                       u32 *rem_addr,
1415                                       u16 loc_port,
1416                                       u32 *loc_addr,
1417                                       bool add_refcnt)
1418 {
1419         struct list_head *hte;
1420         struct i40iw_cm_node *cm_node;
1421         unsigned long flags;
1422
1423         hte = &cm_core->connected_nodes;
1424
1425         /* walk list and find cm_node associated with this session ID */
1426         spin_lock_irqsave(&cm_core->ht_lock, flags);
1427         list_for_each_entry(cm_node, hte, list) {
1428                 if (!memcmp(cm_node->loc_addr, loc_addr, sizeof(cm_node->loc_addr)) &&
1429                     (cm_node->loc_port == loc_port) &&
1430                     !memcmp(cm_node->rem_addr, rem_addr, sizeof(cm_node->rem_addr)) &&
1431                     (cm_node->rem_port == rem_port)) {
1432                         if (add_refcnt)
1433                                 atomic_inc(&cm_node->ref_count);
1434                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1435                         return cm_node;
1436                 }
1437         }
1438         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1439
1440         /* no owner node */
1441         return NULL;
1442 }
1443
1444 /**
1445  * i40iw_find_listener - find a cm node listening on this addr-port pair
1446  * @cm_core: cm's core
1447  * @dst_port: listener tcp port num
1448  * @dst_addr: listener ip addr
1449  * @listener_state: state to match with listen node's
1450  */
1451 static struct i40iw_cm_listener *i40iw_find_listener(
1452                                                      struct i40iw_cm_core *cm_core,
1453                                                      u32 *dst_addr,
1454                                                      u16 dst_port,
1455                                                      u16 vlan_id,
1456                                                      enum i40iw_cm_listener_state
1457                                                      listener_state)
1458 {
1459         struct i40iw_cm_listener *listen_node;
1460         static const u32 ip_zero[4] = { 0, 0, 0, 0 };
1461         u32 listen_addr[4];
1462         u16 listen_port;
1463         unsigned long flags;
1464
1465         /* walk list and find cm_node associated with this session ID */
1466         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1467         list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
1468                 memcpy(listen_addr, listen_node->loc_addr, sizeof(listen_addr));
1469                 listen_port = listen_node->loc_port;
1470                 /* compare node pair, return node handle if a match */
1471                 if ((!memcmp(listen_addr, dst_addr, sizeof(listen_addr)) ||
1472                      !memcmp(listen_addr, ip_zero, sizeof(listen_addr))) &&
1473                      (listen_port == dst_port) &&
1474                      (listener_state & listen_node->listener_state)) {
1475                         atomic_inc(&listen_node->ref_count);
1476                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1477                         return listen_node;
1478                 }
1479         }
1480         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1481         return NULL;
1482 }
1483
1484 /**
1485  * i40iw_add_hte_node - add a cm node to the hash table
1486  * @cm_core: cm's core
1487  * @cm_node: connection's node
1488  */
1489 static void i40iw_add_hte_node(struct i40iw_cm_core *cm_core,
1490                                struct i40iw_cm_node *cm_node)
1491 {
1492         struct list_head *hte;
1493         unsigned long flags;
1494
1495         if (!cm_node || !cm_core) {
1496                 i40iw_pr_err("cm_node or cm_core == NULL\n");
1497                 return;
1498         }
1499         spin_lock_irqsave(&cm_core->ht_lock, flags);
1500
1501         /* get a handle on the hash table element (list head for this slot) */
1502         hte = &cm_core->connected_nodes;
1503         list_add_tail(&cm_node->list, hte);
1504         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1505 }
1506
1507 /**
1508  * i40iw_port_in_use - determine if port is in use
1509  * @port: port number
1510  * @active_side: flag for listener side vs active side
1511  */
1512 static bool i40iw_port_in_use(struct i40iw_cm_core *cm_core, u16 port, bool active_side)
1513 {
1514         struct i40iw_cm_listener *listen_node;
1515         struct i40iw_cm_node *cm_node;
1516         unsigned long flags;
1517         bool ret = false;
1518
1519         if (active_side) {
1520                 /* search connected node list */
1521                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1522                 list_for_each_entry(cm_node, &cm_core->connected_nodes, list) {
1523                         if (cm_node->loc_port == port) {
1524                                 ret = true;
1525                                 break;
1526                         }
1527                 }
1528                 if (!ret)
1529                         clear_bit(port, cm_core->active_side_ports);
1530                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1531         } else {
1532                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1533                 list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
1534                         if (listen_node->loc_port == port) {
1535                                 ret = true;
1536                                 break;
1537                         }
1538                 }
1539                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1540         }
1541
1542         return ret;
1543 }
1544
1545 /**
1546  * i40iw_del_multiple_qhash - Remove qhash and child listens
1547  * @iwdev: iWarp device
1548  * @cm_info: CM info for parent listen node
1549  * @cm_parent_listen_node: The parent listen node
1550  */
1551 static enum i40iw_status_code i40iw_del_multiple_qhash(
1552                                                        struct i40iw_device *iwdev,
1553                                                        struct i40iw_cm_info *cm_info,
1554                                                        struct i40iw_cm_listener *cm_parent_listen_node)
1555 {
1556         struct i40iw_cm_listener *child_listen_node;
1557         enum i40iw_status_code ret = I40IW_ERR_CONFIG;
1558         struct list_head *pos, *tpos;
1559         unsigned long flags;
1560
1561         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1562         list_for_each_safe(pos, tpos, &cm_parent_listen_node->child_listen_list) {
1563                 child_listen_node = list_entry(pos, struct i40iw_cm_listener, child_listen_list);
1564                 if (child_listen_node->ipv4)
1565                         i40iw_debug(&iwdev->sc_dev,
1566                                     I40IW_DEBUG_CM,
1567                                     "removing child listen for IP=%pI4, port=%d, vlan=%d\n",
1568                                     child_listen_node->loc_addr,
1569                                     child_listen_node->loc_port,
1570                                     child_listen_node->vlan_id);
1571                 else
1572                         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM,
1573                                     "removing child listen for IP=%pI6, port=%d, vlan=%d\n",
1574                                     child_listen_node->loc_addr,
1575                                     child_listen_node->loc_port,
1576                                     child_listen_node->vlan_id);
1577                 list_del(pos);
1578                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1579                        sizeof(cm_info->loc_addr));
1580                 cm_info->vlan_id = child_listen_node->vlan_id;
1581                 if (child_listen_node->qhash_set) {
1582                         ret = i40iw_manage_qhash(iwdev, cm_info,
1583                                                  I40IW_QHASH_TYPE_TCP_SYN,
1584                                                  I40IW_QHASH_MANAGE_TYPE_DELETE,
1585                                                  NULL, false);
1586                         child_listen_node->qhash_set = false;
1587                 } else {
1588                         ret = I40IW_SUCCESS;
1589                 }
1590                 i40iw_debug(&iwdev->sc_dev,
1591                             I40IW_DEBUG_CM,
1592                             "freed pointer = %p\n",
1593                             child_listen_node);
1594                 kfree(child_listen_node);
1595                 cm_parent_listen_node->cm_core->stats_listen_nodes_destroyed++;
1596         }
1597         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1598
1599         return ret;
1600 }
1601
1602 /**
1603  * i40iw_netdev_vlan_ipv6 - Gets the netdev and vlan
1604  * @addr: local IPv6 address
1605  * @vlan_id: vlan id for the given IPv6 address
1606  *
1607  * Returns the net_device of the IPv6 address and also sets the
1608  * vlan id for that address.
1609  */
1610 static struct net_device *i40iw_netdev_vlan_ipv6(u32 *addr, u16 *vlan_id)
1611 {
1612         struct net_device *ip_dev = NULL;
1613         struct in6_addr laddr6;
1614
1615         if (!IS_ENABLED(CONFIG_IPV6))
1616                 return NULL;
1617         i40iw_copy_ip_htonl(laddr6.in6_u.u6_addr32, addr);
1618         if (vlan_id)
1619                 *vlan_id = I40IW_NO_VLAN;
1620         rcu_read_lock();
1621         for_each_netdev_rcu(&init_net, ip_dev) {
1622                 if (ipv6_chk_addr(&init_net, &laddr6, ip_dev, 1)) {
1623                         if (vlan_id)
1624                                 *vlan_id = rdma_vlan_dev_vlan_id(ip_dev);
1625                         break;
1626                 }
1627         }
1628         rcu_read_unlock();
1629         return ip_dev;
1630 }
1631
1632 /**
1633  * i40iw_get_vlan_ipv4 - Returns the vlan_id for IPv4 address
1634  * @addr: local IPv4 address
1635  */
1636 static u16 i40iw_get_vlan_ipv4(u32 *addr)
1637 {
1638         struct net_device *netdev;
1639         u16 vlan_id = I40IW_NO_VLAN;
1640
1641         netdev = ip_dev_find(&init_net, htonl(addr[0]));
1642         if (netdev) {
1643                 vlan_id = rdma_vlan_dev_vlan_id(netdev);
1644                 dev_put(netdev);
1645         }
1646         return vlan_id;
1647 }
1648
1649 /**
1650  * i40iw_add_mqh_6 - Adds multiple qhashes for IPv6
1651  * @iwdev: iWarp device
1652  * @cm_info: CM info for parent listen node
1653  * @cm_parent_listen_node: The parent listen node
1654  *
1655  * Adds a qhash and a child listen node for every IPv6 address
1656  * on the adapter and adds the associated qhash filter
1657  */
1658 static enum i40iw_status_code i40iw_add_mqh_6(struct i40iw_device *iwdev,
1659                                               struct i40iw_cm_info *cm_info,
1660                                               struct i40iw_cm_listener *cm_parent_listen_node)
1661 {
1662         struct net_device *ip_dev;
1663         struct inet6_dev *idev;
1664         struct inet6_ifaddr *ifp, *tmp;
1665         enum i40iw_status_code ret = 0;
1666         struct i40iw_cm_listener *child_listen_node;
1667         unsigned long flags;
1668
1669         rtnl_lock();
1670         for_each_netdev_rcu(&init_net, ip_dev) {
1671                 if ((((rdma_vlan_dev_vlan_id(ip_dev) < I40IW_NO_VLAN) &&
1672                       (rdma_vlan_dev_real_dev(ip_dev) == iwdev->netdev)) ||
1673                      (ip_dev == iwdev->netdev)) && (ip_dev->flags & IFF_UP)) {
1674                         idev = __in6_dev_get(ip_dev);
1675                         if (!idev) {
1676                                 i40iw_pr_err("idev == NULL\n");
1677                                 break;
1678                         }
1679                         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
1680                                 i40iw_debug(&iwdev->sc_dev,
1681                                             I40IW_DEBUG_CM,
1682                                             "IP=%pI6, vlan_id=%d, MAC=%pM\n",
1683                                             &ifp->addr,
1684                                             rdma_vlan_dev_vlan_id(ip_dev),
1685                                             ip_dev->dev_addr);
1686                                 child_listen_node =
1687                                         kzalloc(sizeof(*child_listen_node), GFP_ATOMIC);
1688                                 i40iw_debug(&iwdev->sc_dev,
1689                                             I40IW_DEBUG_CM,
1690                                             "Allocating child listener %p\n",
1691                                             child_listen_node);
1692                                 if (!child_listen_node) {
1693                                         ret = I40IW_ERR_NO_MEMORY;
1694                                         goto exit;
1695                                 }
1696                                 cm_info->vlan_id = rdma_vlan_dev_vlan_id(ip_dev);
1697                                 cm_parent_listen_node->vlan_id = cm_info->vlan_id;
1698
1699                                 memcpy(child_listen_node, cm_parent_listen_node,
1700                                        sizeof(*child_listen_node));
1701
1702                                 i40iw_copy_ip_ntohl(child_listen_node->loc_addr,
1703                                                     ifp->addr.in6_u.u6_addr32);
1704                                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1705                                        sizeof(cm_info->loc_addr));
1706
1707                                 ret = i40iw_manage_qhash(iwdev, cm_info,
1708                                                          I40IW_QHASH_TYPE_TCP_SYN,
1709                                                          I40IW_QHASH_MANAGE_TYPE_ADD,
1710                                                          NULL, true);
1711                                 if (!ret) {
1712                                         child_listen_node->qhash_set = true;
1713                                         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1714                                         list_add(&child_listen_node->child_listen_list,
1715                                                  &cm_parent_listen_node->child_listen_list);
1716                                         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1717                                         cm_parent_listen_node->cm_core->stats_listen_nodes_created++;
1718                                 } else {
1719                                         kfree(child_listen_node);
1720                                 }
1721                         }
1722                 }
1723         }
1724 exit:
1725         rtnl_unlock();
1726         return ret;
1727 }
1728
1729 /**
1730  * i40iw_add_mqh_4 - Adds multiple qhashes for IPv4
1731  * @iwdev: iWarp device
1732  * @cm_info: CM info for parent listen node
1733  * @cm_parent_listen_node: The parent listen node
1734  *
1735  * Adds a qhash and a child listen node for every IPv4 address
1736  * on the adapter and adds the associated qhash filter
1737  */
1738 static enum i40iw_status_code i40iw_add_mqh_4(
1739                                 struct i40iw_device *iwdev,
1740                                 struct i40iw_cm_info *cm_info,
1741                                 struct i40iw_cm_listener *cm_parent_listen_node)
1742 {
1743         struct net_device *dev;
1744         struct in_device *idev;
1745         struct i40iw_cm_listener *child_listen_node;
1746         enum i40iw_status_code ret = 0;
1747         unsigned long flags;
1748
1749         rtnl_lock();
1750         for_each_netdev(&init_net, dev) {
1751                 if ((((rdma_vlan_dev_vlan_id(dev) < I40IW_NO_VLAN) &&
1752                       (rdma_vlan_dev_real_dev(dev) == iwdev->netdev)) ||
1753                     (dev == iwdev->netdev)) && (dev->flags & IFF_UP)) {
1754                         idev = in_dev_get(dev);
1755                         for_ifa(idev) {
1756                                 i40iw_debug(&iwdev->sc_dev,
1757                                             I40IW_DEBUG_CM,
1758                                             "Allocating child CM Listener forIP=%pI4, vlan_id=%d, MAC=%pM\n",
1759                                             &ifa->ifa_address,
1760                                             rdma_vlan_dev_vlan_id(dev),
1761                                             dev->dev_addr);
1762                                 child_listen_node = kzalloc(sizeof(*child_listen_node), GFP_ATOMIC);
1763                                 cm_parent_listen_node->cm_core->stats_listen_nodes_created++;
1764                                 i40iw_debug(&iwdev->sc_dev,
1765                                             I40IW_DEBUG_CM,
1766                                             "Allocating child listener %p\n",
1767                                             child_listen_node);
1768                                 if (!child_listen_node) {
1769                                         in_dev_put(idev);
1770                                         ret = I40IW_ERR_NO_MEMORY;
1771                                         goto exit;
1772                                 }
1773                                 cm_info->vlan_id = rdma_vlan_dev_vlan_id(dev);
1774                                 cm_parent_listen_node->vlan_id = cm_info->vlan_id;
1775                                 memcpy(child_listen_node,
1776                                        cm_parent_listen_node,
1777                                        sizeof(*child_listen_node));
1778
1779                                 child_listen_node->loc_addr[0] = ntohl(ifa->ifa_address);
1780                                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1781                                        sizeof(cm_info->loc_addr));
1782
1783                                 ret = i40iw_manage_qhash(iwdev,
1784                                                          cm_info,
1785                                                          I40IW_QHASH_TYPE_TCP_SYN,
1786                                                          I40IW_QHASH_MANAGE_TYPE_ADD,
1787                                                          NULL,
1788                                                          true);
1789                                 if (!ret) {
1790                                         child_listen_node->qhash_set = true;
1791                                         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1792                                         list_add(&child_listen_node->child_listen_list,
1793                                                  &cm_parent_listen_node->child_listen_list);
1794                                         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1795                                 } else {
1796                                         kfree(child_listen_node);
1797                                         cm_parent_listen_node->cm_core->stats_listen_nodes_created--;
1798                                 }
1799                         }
1800                         endfor_ifa(idev);
1801                         in_dev_put(idev);
1802                 }
1803         }
1804 exit:
1805         rtnl_unlock();
1806         return ret;
1807 }
1808
1809 /**
1810  * i40iw_dec_refcnt_listen - delete listener and associated cm nodes
1811  * @cm_core: cm's core
1812  * @free_hanging_nodes: to free associated cm_nodes
1813  * @apbvt_del: flag to delete the apbvt
1814  */
1815 static int i40iw_dec_refcnt_listen(struct i40iw_cm_core *cm_core,
1816                                    struct i40iw_cm_listener *listener,
1817                                    int free_hanging_nodes, bool apbvt_del)
1818 {
1819         int ret = -EINVAL;
1820         int err = 0;
1821         struct list_head *list_pos;
1822         struct list_head *list_temp;
1823         struct i40iw_cm_node *cm_node;
1824         struct list_head reset_list;
1825         struct i40iw_cm_info nfo;
1826         struct i40iw_cm_node *loopback;
1827         enum i40iw_cm_node_state old_state;
1828         unsigned long flags;
1829
1830         /* free non-accelerated child nodes for this listener */
1831         INIT_LIST_HEAD(&reset_list);
1832         if (free_hanging_nodes) {
1833                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1834                 list_for_each_safe(list_pos, list_temp, &cm_core->connected_nodes) {
1835                         cm_node = container_of(list_pos, struct i40iw_cm_node, list);
1836                         if ((cm_node->listener == listener) && !cm_node->accelerated) {
1837                                 atomic_inc(&cm_node->ref_count);
1838                                 list_add(&cm_node->reset_entry, &reset_list);
1839                         }
1840                 }
1841                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1842         }
1843
1844         list_for_each_safe(list_pos, list_temp, &reset_list) {
1845                 cm_node = container_of(list_pos, struct i40iw_cm_node, reset_entry);
1846                 loopback = cm_node->loopbackpartner;
1847                 if (cm_node->state >= I40IW_CM_STATE_FIN_WAIT1) {
1848                         i40iw_rem_ref_cm_node(cm_node);
1849                 } else {
1850                         if (!loopback) {
1851                                 i40iw_cleanup_retrans_entry(cm_node);
1852                                 err = i40iw_send_reset(cm_node);
1853                                 if (err) {
1854                                         cm_node->state = I40IW_CM_STATE_CLOSED;
1855                                         i40iw_pr_err("send reset\n");
1856                                 } else {
1857                                         old_state = cm_node->state;
1858                                         cm_node->state = I40IW_CM_STATE_LISTENER_DESTROYED;
1859                                         if (old_state != I40IW_CM_STATE_MPAREQ_RCVD)
1860                                                 i40iw_rem_ref_cm_node(cm_node);
1861                                 }
1862                         } else {
1863                                 struct i40iw_cm_event event;
1864
1865                                 event.cm_node = loopback;
1866                                 memcpy(event.cm_info.rem_addr,
1867                                        loopback->rem_addr, sizeof(event.cm_info.rem_addr));
1868                                 memcpy(event.cm_info.loc_addr,
1869                                        loopback->loc_addr, sizeof(event.cm_info.loc_addr));
1870                                 event.cm_info.rem_port = loopback->rem_port;
1871                                 event.cm_info.loc_port = loopback->loc_port;
1872                                 event.cm_info.cm_id = loopback->cm_id;
1873                                 event.cm_info.ipv4 = loopback->ipv4;
1874                                 atomic_inc(&loopback->ref_count);
1875                                 loopback->state = I40IW_CM_STATE_CLOSED;
1876                                 i40iw_event_connect_error(&event);
1877                                 cm_node->state = I40IW_CM_STATE_LISTENER_DESTROYED;
1878                                 i40iw_rem_ref_cm_node(cm_node);
1879                         }
1880                 }
1881         }
1882
1883         if (!atomic_dec_return(&listener->ref_count)) {
1884                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1885                 list_del(&listener->list);
1886                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1887
1888                 if (listener->iwdev) {
1889                         if (apbvt_del && !i40iw_port_in_use(cm_core, listener->loc_port, false))
1890                                 i40iw_manage_apbvt(listener->iwdev,
1891                                                    listener->loc_port,
1892                                                    I40IW_MANAGE_APBVT_DEL);
1893
1894                         memcpy(nfo.loc_addr, listener->loc_addr, sizeof(nfo.loc_addr));
1895                         nfo.loc_port = listener->loc_port;
1896                         nfo.ipv4 = listener->ipv4;
1897                         nfo.vlan_id = listener->vlan_id;
1898                         nfo.user_pri = listener->user_pri;
1899
1900                         if (!list_empty(&listener->child_listen_list)) {
1901                                 i40iw_del_multiple_qhash(listener->iwdev, &nfo, listener);
1902                         } else {
1903                                 if (listener->qhash_set)
1904                                         i40iw_manage_qhash(listener->iwdev,
1905                                                            &nfo,
1906                                                            I40IW_QHASH_TYPE_TCP_SYN,
1907                                                            I40IW_QHASH_MANAGE_TYPE_DELETE,
1908                                                            NULL,
1909                                                            false);
1910                         }
1911                 }
1912
1913                 cm_core->stats_listen_destroyed++;
1914                 kfree(listener);
1915                 cm_core->stats_listen_nodes_destroyed++;
1916                 listener = NULL;
1917                 ret = 0;
1918         }
1919
1920         if (listener) {
1921                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1922                         i40iw_debug(cm_core->dev,
1923                                     I40IW_DEBUG_CM,
1924                                     "%s: listener (%p) pending accepts=%u\n",
1925                                     __func__,
1926                                     listener,
1927                                     atomic_read(&listener->pend_accepts_cnt));
1928         }
1929
1930         return ret;
1931 }
1932
1933 /**
1934  * i40iw_cm_del_listen - delete a linstener
1935  * @cm_core: cm's core
1936   * @listener: passive connection's listener
1937  * @apbvt_del: flag to delete apbvt
1938  */
1939 static int i40iw_cm_del_listen(struct i40iw_cm_core *cm_core,
1940                                struct i40iw_cm_listener *listener,
1941                                bool apbvt_del)
1942 {
1943         listener->listener_state = I40IW_CM_LISTENER_PASSIVE_STATE;
1944         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1945         return i40iw_dec_refcnt_listen(cm_core, listener, 1, apbvt_del);
1946 }
1947
1948 /**
1949  * i40iw_addr_resolve_neigh - resolve neighbor address
1950  * @iwdev: iwarp device structure
1951  * @src_ip: local ip address
1952  * @dst_ip: remote ip address
1953  * @arpindex: if there is an arp entry
1954  */
1955 static int i40iw_addr_resolve_neigh(struct i40iw_device *iwdev,
1956                                     u32 src_ip,
1957                                     u32 dst_ip,
1958                                     int arpindex)
1959 {
1960         struct rtable *rt;
1961         struct neighbour *neigh;
1962         int rc = arpindex;
1963         struct net_device *netdev = iwdev->netdev;
1964         __be32 dst_ipaddr = htonl(dst_ip);
1965         __be32 src_ipaddr = htonl(src_ip);
1966
1967         rt = ip_route_output(&init_net, dst_ipaddr, src_ipaddr, 0, 0);
1968         if (IS_ERR(rt)) {
1969                 i40iw_pr_err("ip_route_output\n");
1970                 return rc;
1971         }
1972
1973         if (netif_is_bond_slave(netdev))
1974                 netdev = netdev_master_upper_dev_get(netdev);
1975
1976         neigh = dst_neigh_lookup(&rt->dst, &dst_ipaddr);
1977
1978         rcu_read_lock();
1979         if (neigh) {
1980                 if (neigh->nud_state & NUD_VALID) {
1981                         if (arpindex >= 0) {
1982                                 if (ether_addr_equal(iwdev->arp_table[arpindex].mac_addr,
1983                                                      neigh->ha))
1984                                         /* Mac address same as arp table */
1985                                         goto resolve_neigh_exit;
1986                                 i40iw_manage_arp_cache(iwdev,
1987                                                        iwdev->arp_table[arpindex].mac_addr,
1988                                                        &dst_ip,
1989                                                        true,
1990                                                        I40IW_ARP_DELETE);
1991                         }
1992
1993                         i40iw_manage_arp_cache(iwdev, neigh->ha, &dst_ip, true, I40IW_ARP_ADD);
1994                         rc = i40iw_arp_table(iwdev, &dst_ip, true, NULL, I40IW_ARP_RESOLVE);
1995                 } else {
1996                         neigh_event_send(neigh, NULL);
1997                 }
1998         }
1999  resolve_neigh_exit:
2000
2001         rcu_read_unlock();
2002         if (neigh)
2003                 neigh_release(neigh);
2004
2005         ip_rt_put(rt);
2006         return rc;
2007 }
2008
2009 /**
2010  * i40iw_get_dst_ipv6
2011  */
2012 static struct dst_entry *i40iw_get_dst_ipv6(struct sockaddr_in6 *src_addr,
2013                                             struct sockaddr_in6 *dst_addr)
2014 {
2015         struct dst_entry *dst;
2016         struct flowi6 fl6;
2017
2018         memset(&fl6, 0, sizeof(fl6));
2019         fl6.daddr = dst_addr->sin6_addr;
2020         fl6.saddr = src_addr->sin6_addr;
2021         if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
2022                 fl6.flowi6_oif = dst_addr->sin6_scope_id;
2023
2024         dst = ip6_route_output(&init_net, NULL, &fl6);
2025         return dst;
2026 }
2027
2028 /**
2029  * i40iw_addr_resolve_neigh_ipv6 - resolve neighbor ipv6 address
2030  * @iwdev: iwarp device structure
2031  * @dst_ip: remote ip address
2032  * @arpindex: if there is an arp entry
2033  */
2034 static int i40iw_addr_resolve_neigh_ipv6(struct i40iw_device *iwdev,
2035                                          u32 *src,
2036                                          u32 *dest,
2037                                          int arpindex)
2038 {
2039         struct neighbour *neigh;
2040         int rc = arpindex;
2041         struct net_device *netdev = iwdev->netdev;
2042         struct dst_entry *dst;
2043         struct sockaddr_in6 dst_addr;
2044         struct sockaddr_in6 src_addr;
2045
2046         memset(&dst_addr, 0, sizeof(dst_addr));
2047         dst_addr.sin6_family = AF_INET6;
2048         i40iw_copy_ip_htonl(dst_addr.sin6_addr.in6_u.u6_addr32, dest);
2049         memset(&src_addr, 0, sizeof(src_addr));
2050         src_addr.sin6_family = AF_INET6;
2051         i40iw_copy_ip_htonl(src_addr.sin6_addr.in6_u.u6_addr32, src);
2052         dst = i40iw_get_dst_ipv6(&src_addr, &dst_addr);
2053         if (!dst || dst->error) {
2054                 if (dst) {
2055                         dst_release(dst);
2056                         i40iw_pr_err("ip6_route_output returned dst->error = %d\n",
2057                                      dst->error);
2058                 }
2059                 return rc;
2060         }
2061
2062         if (netif_is_bond_slave(netdev))
2063                 netdev = netdev_master_upper_dev_get(netdev);
2064
2065         neigh = dst_neigh_lookup(dst, &dst_addr);
2066
2067         rcu_read_lock();
2068         if (neigh) {
2069                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM, "dst_neigh_lookup MAC=%pM\n", neigh->ha);
2070                 if (neigh->nud_state & NUD_VALID) {
2071                         if (arpindex >= 0) {
2072                                 if (ether_addr_equal
2073                                     (iwdev->arp_table[arpindex].mac_addr,
2074                                      neigh->ha)) {
2075                                         /* Mac address same as in arp table */
2076                                         goto resolve_neigh_exit6;
2077                                 }
2078                                 i40iw_manage_arp_cache(iwdev,
2079                                                        iwdev->arp_table[arpindex].mac_addr,
2080                                                        dest,
2081                                                        false,
2082                                                        I40IW_ARP_DELETE);
2083                         }
2084                         i40iw_manage_arp_cache(iwdev,
2085                                                neigh->ha,
2086                                                dest,
2087                                                false,
2088                                                I40IW_ARP_ADD);
2089                         rc = i40iw_arp_table(iwdev,
2090                                              dest,
2091                                              false,
2092                                              NULL,
2093                                              I40IW_ARP_RESOLVE);
2094                 } else {
2095                         neigh_event_send(neigh, NULL);
2096                 }
2097         }
2098
2099  resolve_neigh_exit6:
2100         rcu_read_unlock();
2101         if (neigh)
2102                 neigh_release(neigh);
2103         dst_release(dst);
2104         return rc;
2105 }
2106
2107 /**
2108  * i40iw_ipv4_is_loopback - check if loopback
2109  * @loc_addr: local addr to compare
2110  * @rem_addr: remote address
2111  */
2112 static bool i40iw_ipv4_is_loopback(u32 loc_addr, u32 rem_addr)
2113 {
2114         return ipv4_is_loopback(htonl(rem_addr)) || (loc_addr == rem_addr);
2115 }
2116
2117 /**
2118  * i40iw_ipv6_is_loopback - check if loopback
2119  * @loc_addr: local addr to compare
2120  * @rem_addr: remote address
2121  */
2122 static bool i40iw_ipv6_is_loopback(u32 *loc_addr, u32 *rem_addr)
2123 {
2124         struct in6_addr raddr6;
2125
2126         i40iw_copy_ip_htonl(raddr6.in6_u.u6_addr32, rem_addr);
2127         return !memcmp(loc_addr, rem_addr, 16) || ipv6_addr_loopback(&raddr6);
2128 }
2129
2130 /**
2131  * i40iw_make_cm_node - create a new instance of a cm node
2132  * @cm_core: cm's core
2133  * @iwdev: iwarp device structure
2134  * @cm_info: quad info for connection
2135  * @listener: passive connection's listener
2136  */
2137 static struct i40iw_cm_node *i40iw_make_cm_node(
2138                                    struct i40iw_cm_core *cm_core,
2139                                    struct i40iw_device *iwdev,
2140                                    struct i40iw_cm_info *cm_info,
2141                                    struct i40iw_cm_listener *listener)
2142 {
2143         struct i40iw_cm_node *cm_node;
2144         struct timespec ts;
2145         int oldarpindex;
2146         int arpindex;
2147         struct net_device *netdev = iwdev->netdev;
2148
2149         /* create an hte and cm_node for this instance */
2150         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
2151         if (!cm_node)
2152                 return NULL;
2153
2154         /* set our node specific transport info */
2155         cm_node->ipv4 = cm_info->ipv4;
2156         cm_node->vlan_id = cm_info->vlan_id;
2157         if ((cm_node->vlan_id == I40IW_NO_VLAN) && iwdev->dcb)
2158                 cm_node->vlan_id = 0;
2159         cm_node->tos = cm_info->tos;
2160         cm_node->user_pri = cm_info->user_pri;
2161         if (listener) {
2162                 if (listener->tos != cm_info->tos)
2163                         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB,
2164                                     "application TOS[%d] and remote client TOS[%d] mismatch\n",
2165                                      listener->tos, cm_info->tos);
2166                 cm_node->tos = max(listener->tos, cm_info->tos);
2167                 cm_node->user_pri = rt_tos2priority(cm_node->tos);
2168                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB, "listener: TOS:[%d] UP:[%d]\n",
2169                             cm_node->tos, cm_node->user_pri);
2170         }
2171         memcpy(cm_node->loc_addr, cm_info->loc_addr, sizeof(cm_node->loc_addr));
2172         memcpy(cm_node->rem_addr, cm_info->rem_addr, sizeof(cm_node->rem_addr));
2173         cm_node->loc_port = cm_info->loc_port;
2174         cm_node->rem_port = cm_info->rem_port;
2175
2176         cm_node->mpa_frame_rev = iwdev->mpa_version;
2177         cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
2178         cm_node->ird_size = I40IW_MAX_IRD_SIZE;
2179         cm_node->ord_size = I40IW_MAX_ORD_SIZE;
2180
2181         cm_node->listener = listener;
2182         cm_node->cm_id = cm_info->cm_id;
2183         ether_addr_copy(cm_node->loc_mac, netdev->dev_addr);
2184         spin_lock_init(&cm_node->retrans_list_lock);
2185         cm_node->ack_rcvd = false;
2186
2187         atomic_set(&cm_node->ref_count, 1);
2188         /* associate our parent CM core */
2189         cm_node->cm_core = cm_core;
2190         cm_node->tcp_cntxt.loc_id = I40IW_CM_DEF_LOCAL_ID;
2191         cm_node->tcp_cntxt.rcv_wscale = I40IW_CM_DEFAULT_RCV_WND_SCALE;
2192         cm_node->tcp_cntxt.rcv_wnd =
2193                         I40IW_CM_DEFAULT_RCV_WND_SCALED >> I40IW_CM_DEFAULT_RCV_WND_SCALE;
2194         ts = current_kernel_time();
2195         cm_node->tcp_cntxt.loc_seq_num = ts.tv_nsec;
2196         cm_node->tcp_cntxt.mss = (cm_node->ipv4) ? (iwdev->vsi.mtu - I40IW_MTU_TO_MSS_IPV4) :
2197                                  (iwdev->vsi.mtu - I40IW_MTU_TO_MSS_IPV6);
2198
2199         cm_node->iwdev = iwdev;
2200         cm_node->dev = &iwdev->sc_dev;
2201
2202         if ((cm_node->ipv4 &&
2203              i40iw_ipv4_is_loopback(cm_node->loc_addr[0], cm_node->rem_addr[0])) ||
2204              (!cm_node->ipv4 && i40iw_ipv6_is_loopback(cm_node->loc_addr,
2205                                                        cm_node->rem_addr))) {
2206                 arpindex = i40iw_arp_table(iwdev,
2207                                            cm_node->rem_addr,
2208                                            false,
2209                                            NULL,
2210                                            I40IW_ARP_RESOLVE);
2211         } else {
2212                 oldarpindex = i40iw_arp_table(iwdev,
2213                                               cm_node->rem_addr,
2214                                               false,
2215                                               NULL,
2216                                               I40IW_ARP_RESOLVE);
2217                 if (cm_node->ipv4)
2218                         arpindex = i40iw_addr_resolve_neigh(iwdev,
2219                                                             cm_info->loc_addr[0],
2220                                                             cm_info->rem_addr[0],
2221                                                             oldarpindex);
2222                 else if (IS_ENABLED(CONFIG_IPV6))
2223                         arpindex = i40iw_addr_resolve_neigh_ipv6(iwdev,
2224                                                                  cm_info->loc_addr,
2225                                                                  cm_info->rem_addr,
2226                                                                  oldarpindex);
2227                 else
2228                         arpindex = -EINVAL;
2229         }
2230         if (arpindex < 0) {
2231                 i40iw_pr_err("cm_node arpindex\n");
2232                 kfree(cm_node);
2233                 return NULL;
2234         }
2235         ether_addr_copy(cm_node->rem_mac, iwdev->arp_table[arpindex].mac_addr);
2236         i40iw_add_hte_node(cm_core, cm_node);
2237         cm_core->stats_nodes_created++;
2238         return cm_node;
2239 }
2240
2241 /**
2242  * i40iw_rem_ref_cm_node - destroy an instance of a cm node
2243  * @cm_node: connection's node
2244  */
2245 static void i40iw_rem_ref_cm_node(struct i40iw_cm_node *cm_node)
2246 {
2247         struct i40iw_cm_core *cm_core = cm_node->cm_core;
2248         struct i40iw_qp *iwqp;
2249         struct i40iw_cm_info nfo;
2250         unsigned long flags;
2251
2252         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
2253         if (atomic_dec_return(&cm_node->ref_count)) {
2254                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
2255                 return;
2256         }
2257         list_del(&cm_node->list);
2258         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
2259
2260         /* if the node is destroyed before connection was accelerated */
2261         if (!cm_node->accelerated && cm_node->accept_pend) {
2262                 pr_err("node destroyed before established\n");
2263                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
2264         }
2265         if (cm_node->close_entry)
2266                 i40iw_handle_close_entry(cm_node, 0);
2267         if (cm_node->listener) {
2268                 i40iw_dec_refcnt_listen(cm_core, cm_node->listener, 0, true);
2269         } else {
2270                 if (!i40iw_port_in_use(cm_core, cm_node->loc_port, true) && cm_node->apbvt_set) {
2271                         i40iw_manage_apbvt(cm_node->iwdev,
2272                                            cm_node->loc_port,
2273                                            I40IW_MANAGE_APBVT_DEL);
2274                         cm_node->apbvt_set = 0;
2275                 }
2276                 i40iw_get_addr_info(cm_node, &nfo);
2277                 if (cm_node->qhash_set) {
2278                         i40iw_manage_qhash(cm_node->iwdev,
2279                                            &nfo,
2280                                            I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2281                                            I40IW_QHASH_MANAGE_TYPE_DELETE,
2282                                            NULL,
2283                                            false);
2284                         cm_node->qhash_set = 0;
2285                 }
2286         }
2287
2288         iwqp = cm_node->iwqp;
2289         if (iwqp) {
2290                 iwqp->cm_node = NULL;
2291                 i40iw_rem_ref(&iwqp->ibqp);
2292                 cm_node->iwqp = NULL;
2293         } else if (cm_node->qhash_set) {
2294                 i40iw_get_addr_info(cm_node, &nfo);
2295                 i40iw_manage_qhash(cm_node->iwdev,
2296                                    &nfo,
2297                                    I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2298                                    I40IW_QHASH_MANAGE_TYPE_DELETE,
2299                                    NULL,
2300                                    false);
2301                 cm_node->qhash_set = 0;
2302         }
2303
2304         cm_node->cm_core->stats_nodes_destroyed++;
2305         kfree(cm_node);
2306 }
2307
2308 /**
2309  * i40iw_handle_fin_pkt - FIN packet received
2310  * @cm_node: connection's node
2311  */
2312 static void i40iw_handle_fin_pkt(struct i40iw_cm_node *cm_node)
2313 {
2314         u32 ret;
2315
2316         switch (cm_node->state) {
2317         case I40IW_CM_STATE_SYN_RCVD:
2318         case I40IW_CM_STATE_SYN_SENT:
2319         case I40IW_CM_STATE_ESTABLISHED:
2320         case I40IW_CM_STATE_MPAREJ_RCVD:
2321                 cm_node->tcp_cntxt.rcv_nxt++;
2322                 i40iw_cleanup_retrans_entry(cm_node);
2323                 cm_node->state = I40IW_CM_STATE_LAST_ACK;
2324                 i40iw_send_fin(cm_node);
2325                 break;
2326         case I40IW_CM_STATE_MPAREQ_SENT:
2327                 i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
2328                 cm_node->tcp_cntxt.rcv_nxt++;
2329                 i40iw_cleanup_retrans_entry(cm_node);
2330                 cm_node->state = I40IW_CM_STATE_CLOSED;
2331                 atomic_inc(&cm_node->ref_count);
2332                 i40iw_send_reset(cm_node);
2333                 break;
2334         case I40IW_CM_STATE_FIN_WAIT1:
2335                 cm_node->tcp_cntxt.rcv_nxt++;
2336                 i40iw_cleanup_retrans_entry(cm_node);
2337                 cm_node->state = I40IW_CM_STATE_CLOSING;
2338                 i40iw_send_ack(cm_node);
2339                 /*
2340                  * Wait for ACK as this is simultaneous close.
2341                  * After we receive ACK, do not send anything.
2342                  * Just rm the node.
2343                  */
2344                 break;
2345         case I40IW_CM_STATE_FIN_WAIT2:
2346                 cm_node->tcp_cntxt.rcv_nxt++;
2347                 i40iw_cleanup_retrans_entry(cm_node);
2348                 cm_node->state = I40IW_CM_STATE_TIME_WAIT;
2349                 i40iw_send_ack(cm_node);
2350                 ret =
2351                     i40iw_schedule_cm_timer(cm_node, NULL, I40IW_TIMER_TYPE_CLOSE, 1, 0);
2352                 if (ret)
2353                         i40iw_pr_err("node %p state = %d\n", cm_node, cm_node->state);
2354                 break;
2355         case I40IW_CM_STATE_TIME_WAIT:
2356                 cm_node->tcp_cntxt.rcv_nxt++;
2357                 i40iw_cleanup_retrans_entry(cm_node);
2358                 cm_node->state = I40IW_CM_STATE_CLOSED;
2359                 i40iw_rem_ref_cm_node(cm_node);
2360                 break;
2361         case I40IW_CM_STATE_OFFLOADED:
2362         default:
2363                 i40iw_pr_err("bad state node %p state = %d\n", cm_node, cm_node->state);
2364                 break;
2365         }
2366 }
2367
2368 /**
2369  * i40iw_handle_rst_pkt - process received RST packet
2370  * @cm_node: connection's node
2371  * @rbuf: receive buffer
2372  */
2373 static void i40iw_handle_rst_pkt(struct i40iw_cm_node *cm_node,
2374                                  struct i40iw_puda_buf *rbuf)
2375 {
2376         i40iw_cleanup_retrans_entry(cm_node);
2377         switch (cm_node->state) {
2378         case I40IW_CM_STATE_SYN_SENT:
2379         case I40IW_CM_STATE_MPAREQ_SENT:
2380                 switch (cm_node->mpa_frame_rev) {
2381                 case IETF_MPA_V2:
2382                         cm_node->mpa_frame_rev = IETF_MPA_V1;
2383                         /* send a syn and goto syn sent state */
2384                         cm_node->state = I40IW_CM_STATE_SYN_SENT;
2385                         if (i40iw_send_syn(cm_node, 0))
2386                                 i40iw_active_open_err(cm_node, false);
2387                         break;
2388                 case IETF_MPA_V1:
2389                 default:
2390                         i40iw_active_open_err(cm_node, false);
2391                         break;
2392                 }
2393                 break;
2394         case I40IW_CM_STATE_MPAREQ_RCVD:
2395                 atomic_add_return(1, &cm_node->passive_state);
2396                 break;
2397         case I40IW_CM_STATE_ESTABLISHED:
2398         case I40IW_CM_STATE_SYN_RCVD:
2399         case I40IW_CM_STATE_LISTENING:
2400                 i40iw_pr_err("Bad state state = %d\n", cm_node->state);
2401                 i40iw_passive_open_err(cm_node, false);
2402                 break;
2403         case I40IW_CM_STATE_OFFLOADED:
2404                 i40iw_active_open_err(cm_node, false);
2405                 break;
2406         case I40IW_CM_STATE_CLOSED:
2407                 break;
2408         case I40IW_CM_STATE_FIN_WAIT2:
2409         case I40IW_CM_STATE_FIN_WAIT1:
2410         case I40IW_CM_STATE_LAST_ACK:
2411                 cm_node->cm_id->rem_ref(cm_node->cm_id);
2412                 /* fall through */
2413         case I40IW_CM_STATE_TIME_WAIT:
2414                 cm_node->state = I40IW_CM_STATE_CLOSED;
2415                 i40iw_rem_ref_cm_node(cm_node);
2416                 break;
2417         default:
2418                 break;
2419         }
2420 }
2421
2422 /**
2423  * i40iw_handle_rcv_mpa - Process a recv'd mpa buffer
2424  * @cm_node: connection's node
2425  * @rbuf: receive buffer
2426  */
2427 static void i40iw_handle_rcv_mpa(struct i40iw_cm_node *cm_node,
2428                                  struct i40iw_puda_buf *rbuf)
2429 {
2430         int ret;
2431         int datasize = rbuf->datalen;
2432         u8 *dataloc = rbuf->data;
2433
2434         enum i40iw_cm_event_type type = I40IW_CM_EVENT_UNKNOWN;
2435         u32 res_type;
2436
2437         ret = i40iw_parse_mpa(cm_node, dataloc, &res_type, datasize);
2438         if (ret) {
2439                 if (cm_node->state == I40IW_CM_STATE_MPAREQ_SENT)
2440                         i40iw_active_open_err(cm_node, true);
2441                 else
2442                         i40iw_passive_open_err(cm_node, true);
2443                 return;
2444         }
2445
2446         switch (cm_node->state) {
2447         case I40IW_CM_STATE_ESTABLISHED:
2448                 if (res_type == I40IW_MPA_REQUEST_REJECT)
2449                         i40iw_pr_err("state for reject\n");
2450                 cm_node->state = I40IW_CM_STATE_MPAREQ_RCVD;
2451                 type = I40IW_CM_EVENT_MPA_REQ;
2452                 i40iw_send_ack(cm_node);        /* ACK received MPA request */
2453                 atomic_set(&cm_node->passive_state,
2454                            I40IW_PASSIVE_STATE_INDICATED);
2455                 break;
2456         case I40IW_CM_STATE_MPAREQ_SENT:
2457                 i40iw_cleanup_retrans_entry(cm_node);
2458                 if (res_type == I40IW_MPA_REQUEST_REJECT) {
2459                         type = I40IW_CM_EVENT_MPA_REJECT;
2460                         cm_node->state = I40IW_CM_STATE_MPAREJ_RCVD;
2461                 } else {
2462                         type = I40IW_CM_EVENT_CONNECTED;
2463                         cm_node->state = I40IW_CM_STATE_OFFLOADED;
2464                 }
2465                 i40iw_send_ack(cm_node);
2466                 break;
2467         default:
2468                 pr_err("%s wrong cm_node state =%d\n", __func__, cm_node->state);
2469                 break;
2470         }
2471         i40iw_create_event(cm_node, type);
2472 }
2473
2474 /**
2475  * i40iw_indicate_pkt_err - Send up err event to cm
2476  * @cm_node: connection's node
2477  */
2478 static void i40iw_indicate_pkt_err(struct i40iw_cm_node *cm_node)
2479 {
2480         switch (cm_node->state) {
2481         case I40IW_CM_STATE_SYN_SENT:
2482         case I40IW_CM_STATE_MPAREQ_SENT:
2483                 i40iw_active_open_err(cm_node, true);
2484                 break;
2485         case I40IW_CM_STATE_ESTABLISHED:
2486         case I40IW_CM_STATE_SYN_RCVD:
2487                 i40iw_passive_open_err(cm_node, true);
2488                 break;
2489         case I40IW_CM_STATE_OFFLOADED:
2490         default:
2491                 break;
2492         }
2493 }
2494
2495 /**
2496  * i40iw_check_syn - Check for error on received syn ack
2497  * @cm_node: connection's node
2498  * @tcph: pointer tcp header
2499  */
2500 static int i40iw_check_syn(struct i40iw_cm_node *cm_node, struct tcphdr *tcph)
2501 {
2502         int err = 0;
2503
2504         if (ntohl(tcph->ack_seq) != cm_node->tcp_cntxt.loc_seq_num) {
2505                 err = 1;
2506                 i40iw_active_open_err(cm_node, true);
2507         }
2508         return err;
2509 }
2510
2511 /**
2512  * i40iw_check_seq - check seq numbers if OK
2513  * @cm_node: connection's node
2514  * @tcph: pointer tcp header
2515  */
2516 static int i40iw_check_seq(struct i40iw_cm_node *cm_node, struct tcphdr *tcph)
2517 {
2518         int err = 0;
2519         u32 seq;
2520         u32 ack_seq;
2521         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
2522         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
2523         u32 rcv_wnd;
2524
2525         seq = ntohl(tcph->seq);
2526         ack_seq = ntohl(tcph->ack_seq);
2527         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
2528         if (ack_seq != loc_seq_num)
2529                 err = -1;
2530         else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
2531                 err = -1;
2532         if (err) {
2533                 i40iw_pr_err("seq number\n");
2534                 i40iw_indicate_pkt_err(cm_node);
2535         }
2536         return err;
2537 }
2538
2539 /**
2540  * i40iw_handle_syn_pkt - is for Passive node
2541  * @cm_node: connection's node
2542  * @rbuf: receive buffer
2543  */
2544 static void i40iw_handle_syn_pkt(struct i40iw_cm_node *cm_node,
2545                                  struct i40iw_puda_buf *rbuf)
2546 {
2547         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2548         int ret;
2549         u32 inc_sequence;
2550         int optionsize;
2551         struct i40iw_cm_info nfo;
2552
2553         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2554         inc_sequence = ntohl(tcph->seq);
2555
2556         switch (cm_node->state) {
2557         case I40IW_CM_STATE_SYN_SENT:
2558         case I40IW_CM_STATE_MPAREQ_SENT:
2559                 /* Rcvd syn on active open connection */
2560                 i40iw_active_open_err(cm_node, 1);
2561                 break;
2562         case I40IW_CM_STATE_LISTENING:
2563                 /* Passive OPEN */
2564                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
2565                     cm_node->listener->backlog) {
2566                         cm_node->cm_core->stats_backlog_drops++;
2567                         i40iw_passive_open_err(cm_node, false);
2568                         break;
2569                 }
2570                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 1);
2571                 if (ret) {
2572                         i40iw_passive_open_err(cm_node, false);
2573                         /* drop pkt */
2574                         break;
2575                 }
2576                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2577                 cm_node->accept_pend = 1;
2578                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
2579
2580                 cm_node->state = I40IW_CM_STATE_SYN_RCVD;
2581                 i40iw_get_addr_info(cm_node, &nfo);
2582                 ret = i40iw_manage_qhash(cm_node->iwdev,
2583                                          &nfo,
2584                                          I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2585                                          I40IW_QHASH_MANAGE_TYPE_ADD,
2586                                          (void *)cm_node,
2587                                          false);
2588                 cm_node->qhash_set = true;
2589                 break;
2590         case I40IW_CM_STATE_CLOSED:
2591                 i40iw_cleanup_retrans_entry(cm_node);
2592                 atomic_inc(&cm_node->ref_count);
2593                 i40iw_send_reset(cm_node);
2594                 break;
2595         case I40IW_CM_STATE_OFFLOADED:
2596         case I40IW_CM_STATE_ESTABLISHED:
2597         case I40IW_CM_STATE_FIN_WAIT1:
2598         case I40IW_CM_STATE_FIN_WAIT2:
2599         case I40IW_CM_STATE_MPAREQ_RCVD:
2600         case I40IW_CM_STATE_LAST_ACK:
2601         case I40IW_CM_STATE_CLOSING:
2602         case I40IW_CM_STATE_UNKNOWN:
2603         default:
2604                 break;
2605         }
2606 }
2607
2608 /**
2609  * i40iw_handle_synack_pkt - Process SYN+ACK packet (active side)
2610  * @cm_node: connection's node
2611  * @rbuf: receive buffer
2612  */
2613 static void i40iw_handle_synack_pkt(struct i40iw_cm_node *cm_node,
2614                                     struct i40iw_puda_buf *rbuf)
2615 {
2616         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2617         int ret;
2618         u32 inc_sequence;
2619         int optionsize;
2620
2621         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2622         inc_sequence = ntohl(tcph->seq);
2623         switch (cm_node->state) {
2624         case I40IW_CM_STATE_SYN_SENT:
2625                 i40iw_cleanup_retrans_entry(cm_node);
2626                 /* active open */
2627                 if (i40iw_check_syn(cm_node, tcph)) {
2628                         i40iw_pr_err("check syn fail\n");
2629                         return;
2630                 }
2631                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2632                 /* setup options */
2633                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 0);
2634                 if (ret) {
2635                         i40iw_debug(cm_node->dev,
2636                                     I40IW_DEBUG_CM,
2637                                     "cm_node=%p tcp_options failed\n",
2638                                     cm_node);
2639                         break;
2640                 }
2641                 i40iw_cleanup_retrans_entry(cm_node);
2642                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2643                 i40iw_send_ack(cm_node);        /* ACK  for the syn_ack */
2644                 ret = i40iw_send_mpa_request(cm_node);
2645                 if (ret) {
2646                         i40iw_debug(cm_node->dev,
2647                                     I40IW_DEBUG_CM,
2648                                     "cm_node=%p i40iw_send_mpa_request failed\n",
2649                                     cm_node);
2650                         break;
2651                 }
2652                 cm_node->state = I40IW_CM_STATE_MPAREQ_SENT;
2653                 break;
2654         case I40IW_CM_STATE_MPAREQ_RCVD:
2655                 i40iw_passive_open_err(cm_node, true);
2656                 break;
2657         case I40IW_CM_STATE_LISTENING:
2658                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2659                 i40iw_cleanup_retrans_entry(cm_node);
2660                 cm_node->state = I40IW_CM_STATE_CLOSED;
2661                 i40iw_send_reset(cm_node);
2662                 break;
2663         case I40IW_CM_STATE_CLOSED:
2664                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2665                 i40iw_cleanup_retrans_entry(cm_node);
2666                 atomic_inc(&cm_node->ref_count);
2667                 i40iw_send_reset(cm_node);
2668                 break;
2669         case I40IW_CM_STATE_ESTABLISHED:
2670         case I40IW_CM_STATE_FIN_WAIT1:
2671         case I40IW_CM_STATE_FIN_WAIT2:
2672         case I40IW_CM_STATE_LAST_ACK:
2673         case I40IW_CM_STATE_OFFLOADED:
2674         case I40IW_CM_STATE_CLOSING:
2675         case I40IW_CM_STATE_UNKNOWN:
2676         case I40IW_CM_STATE_MPAREQ_SENT:
2677         default:
2678                 break;
2679         }
2680 }
2681
2682 /**
2683  * i40iw_handle_ack_pkt - process packet with ACK
2684  * @cm_node: connection's node
2685  * @rbuf: receive buffer
2686  */
2687 static int i40iw_handle_ack_pkt(struct i40iw_cm_node *cm_node,
2688                                 struct i40iw_puda_buf *rbuf)
2689 {
2690         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2691         u32 inc_sequence;
2692         int ret = 0;
2693         int optionsize;
2694         u32 datasize = rbuf->datalen;
2695
2696         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2697
2698         if (i40iw_check_seq(cm_node, tcph))
2699                 return -EINVAL;
2700
2701         inc_sequence = ntohl(tcph->seq);
2702         switch (cm_node->state) {
2703         case I40IW_CM_STATE_SYN_RCVD:
2704                 i40iw_cleanup_retrans_entry(cm_node);
2705                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 1);
2706                 if (ret)
2707                         break;
2708                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2709                 cm_node->state = I40IW_CM_STATE_ESTABLISHED;
2710                 if (datasize) {
2711                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2712                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2713                 }
2714                 break;
2715         case I40IW_CM_STATE_ESTABLISHED:
2716                 i40iw_cleanup_retrans_entry(cm_node);
2717                 if (datasize) {
2718                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2719                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2720                 }
2721                 break;
2722         case I40IW_CM_STATE_MPAREQ_SENT:
2723                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2724                 if (datasize) {
2725                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2726                         cm_node->ack_rcvd = false;
2727                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2728                 } else {
2729                         cm_node->ack_rcvd = true;
2730                 }
2731                 break;
2732         case I40IW_CM_STATE_LISTENING:
2733                 i40iw_cleanup_retrans_entry(cm_node);
2734                 cm_node->state = I40IW_CM_STATE_CLOSED;
2735                 i40iw_send_reset(cm_node);
2736                 break;
2737         case I40IW_CM_STATE_CLOSED:
2738                 i40iw_cleanup_retrans_entry(cm_node);
2739                 atomic_inc(&cm_node->ref_count);
2740                 i40iw_send_reset(cm_node);
2741                 break;
2742         case I40IW_CM_STATE_LAST_ACK:
2743         case I40IW_CM_STATE_CLOSING:
2744                 i40iw_cleanup_retrans_entry(cm_node);
2745                 cm_node->state = I40IW_CM_STATE_CLOSED;
2746                 if (!cm_node->accept_pend)
2747                         cm_node->cm_id->rem_ref(cm_node->cm_id);
2748                 i40iw_rem_ref_cm_node(cm_node);
2749                 break;
2750         case I40IW_CM_STATE_FIN_WAIT1:
2751                 i40iw_cleanup_retrans_entry(cm_node);
2752                 cm_node->state = I40IW_CM_STATE_FIN_WAIT2;
2753                 break;
2754         case I40IW_CM_STATE_SYN_SENT:
2755         case I40IW_CM_STATE_FIN_WAIT2:
2756         case I40IW_CM_STATE_OFFLOADED:
2757         case I40IW_CM_STATE_MPAREQ_RCVD:
2758         case I40IW_CM_STATE_UNKNOWN:
2759         default:
2760                 i40iw_cleanup_retrans_entry(cm_node);
2761                 break;
2762         }
2763         return ret;
2764 }
2765
2766 /**
2767  * i40iw_process_packet - process cm packet
2768  * @cm_node: connection's node
2769  * @rbuf: receive buffer
2770  */
2771 static void i40iw_process_packet(struct i40iw_cm_node *cm_node,
2772                                  struct i40iw_puda_buf *rbuf)
2773 {
2774         enum i40iw_tcpip_pkt_type pkt_type = I40IW_PKT_TYPE_UNKNOWN;
2775         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2776         u32 fin_set = 0;
2777         int ret;
2778
2779         if (tcph->rst) {
2780                 pkt_type = I40IW_PKT_TYPE_RST;
2781         } else if (tcph->syn) {
2782                 pkt_type = I40IW_PKT_TYPE_SYN;
2783                 if (tcph->ack)
2784                         pkt_type = I40IW_PKT_TYPE_SYNACK;
2785         } else if (tcph->ack) {
2786                 pkt_type = I40IW_PKT_TYPE_ACK;
2787         }
2788         if (tcph->fin)
2789                 fin_set = 1;
2790
2791         switch (pkt_type) {
2792         case I40IW_PKT_TYPE_SYN:
2793                 i40iw_handle_syn_pkt(cm_node, rbuf);
2794                 break;
2795         case I40IW_PKT_TYPE_SYNACK:
2796                 i40iw_handle_synack_pkt(cm_node, rbuf);
2797                 break;
2798         case I40IW_PKT_TYPE_ACK:
2799                 ret = i40iw_handle_ack_pkt(cm_node, rbuf);
2800                 if (fin_set && !ret)
2801                         i40iw_handle_fin_pkt(cm_node);
2802                 break;
2803         case I40IW_PKT_TYPE_RST:
2804                 i40iw_handle_rst_pkt(cm_node, rbuf);
2805                 break;
2806         default:
2807                 if (fin_set &&
2808                     (!i40iw_check_seq(cm_node, (struct tcphdr *)rbuf->tcph)))
2809                         i40iw_handle_fin_pkt(cm_node);
2810                 break;
2811         }
2812 }
2813
2814 /**
2815  * i40iw_make_listen_node - create a listen node with params
2816  * @cm_core: cm's core
2817  * @iwdev: iwarp device structure
2818  * @cm_info: quad info for connection
2819  */
2820 static struct i40iw_cm_listener *i40iw_make_listen_node(
2821                                         struct i40iw_cm_core *cm_core,
2822                                         struct i40iw_device *iwdev,
2823                                         struct i40iw_cm_info *cm_info)
2824 {
2825         struct i40iw_cm_listener *listener;
2826         unsigned long flags;
2827
2828         /* cannot have multiple matching listeners */
2829         listener = i40iw_find_listener(cm_core, cm_info->loc_addr,
2830                                        cm_info->loc_port,
2831                                        cm_info->vlan_id,
2832                                        I40IW_CM_LISTENER_EITHER_STATE);
2833         if (listener &&
2834             (listener->listener_state == I40IW_CM_LISTENER_ACTIVE_STATE)) {
2835                 atomic_dec(&listener->ref_count);
2836                 i40iw_debug(cm_core->dev,
2837                             I40IW_DEBUG_CM,
2838                             "Not creating listener since it already exists\n");
2839                 return NULL;
2840         }
2841
2842         if (!listener) {
2843                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2844                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2845                 if (!listener)
2846                         return NULL;
2847                 cm_core->stats_listen_nodes_created++;
2848                 memcpy(listener->loc_addr, cm_info->loc_addr, sizeof(listener->loc_addr));
2849                 listener->loc_port = cm_info->loc_port;
2850
2851                 INIT_LIST_HEAD(&listener->child_listen_list);
2852
2853                 atomic_set(&listener->ref_count, 1);
2854         } else {
2855                 listener->reused_node = 1;
2856         }
2857
2858         listener->cm_id = cm_info->cm_id;
2859         listener->ipv4 = cm_info->ipv4;
2860         listener->vlan_id = cm_info->vlan_id;
2861         atomic_set(&listener->pend_accepts_cnt, 0);
2862         listener->cm_core = cm_core;
2863         listener->iwdev = iwdev;
2864
2865         listener->backlog = cm_info->backlog;
2866         listener->listener_state = I40IW_CM_LISTENER_ACTIVE_STATE;
2867
2868         if (!listener->reused_node) {
2869                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2870                 list_add(&listener->list, &cm_core->listen_nodes);
2871                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2872         }
2873
2874         return listener;
2875 }
2876
2877 /**
2878  * i40iw_create_cm_node - make a connection node with params
2879  * @cm_core: cm's core
2880  * @iwdev: iwarp device structure
2881  * @private_data_len: len to provate data for mpa request
2882  * @private_data: pointer to private data for connection
2883  * @cm_info: quad info for connection
2884  */
2885 static struct i40iw_cm_node *i40iw_create_cm_node(
2886                                         struct i40iw_cm_core *cm_core,
2887                                         struct i40iw_device *iwdev,
2888                                         u16 private_data_len,
2889                                         void *private_data,
2890                                         struct i40iw_cm_info *cm_info)
2891 {
2892         struct i40iw_cm_node *cm_node;
2893         struct i40iw_cm_listener *loopback_remotelistener;
2894         struct i40iw_cm_node *loopback_remotenode;
2895         struct i40iw_cm_info loopback_cm_info;
2896
2897         /* create a CM connection node */
2898         cm_node = i40iw_make_cm_node(cm_core, iwdev, cm_info, NULL);
2899         if (!cm_node)
2900                 return ERR_PTR(-ENOMEM);
2901         /* set our node side to client (active) side */
2902         cm_node->tcp_cntxt.client = 1;
2903         cm_node->tcp_cntxt.rcv_wscale = I40IW_CM_DEFAULT_RCV_WND_SCALE;
2904
2905         if (!memcmp(cm_info->loc_addr, cm_info->rem_addr, sizeof(cm_info->loc_addr))) {
2906                 loopback_remotelistener = i40iw_find_listener(
2907                                                 cm_core,
2908                                                 cm_info->rem_addr,
2909                                                 cm_node->rem_port,
2910                                                 cm_node->vlan_id,
2911                                                 I40IW_CM_LISTENER_ACTIVE_STATE);
2912                 if (!loopback_remotelistener) {
2913                         i40iw_rem_ref_cm_node(cm_node);
2914                         return ERR_PTR(-ECONNREFUSED);
2915                 } else {
2916                         loopback_cm_info = *cm_info;
2917                         loopback_cm_info.loc_port = cm_info->rem_port;
2918                         loopback_cm_info.rem_port = cm_info->loc_port;
2919                         loopback_cm_info.cm_id = loopback_remotelistener->cm_id;
2920                         loopback_cm_info.ipv4 = cm_info->ipv4;
2921                         loopback_remotenode = i40iw_make_cm_node(cm_core,
2922                                                                  iwdev,
2923                                                                  &loopback_cm_info,
2924                                                                  loopback_remotelistener);
2925                         if (!loopback_remotenode) {
2926                                 i40iw_rem_ref_cm_node(cm_node);
2927                                 return ERR_PTR(-ENOMEM);
2928                         }
2929                         cm_core->stats_loopbacks++;
2930                         loopback_remotenode->loopbackpartner = cm_node;
2931                         loopback_remotenode->tcp_cntxt.rcv_wscale =
2932                                 I40IW_CM_DEFAULT_RCV_WND_SCALE;
2933                         cm_node->loopbackpartner = loopback_remotenode;
2934                         memcpy(loopback_remotenode->pdata_buf, private_data,
2935                                private_data_len);
2936                         loopback_remotenode->pdata.size = private_data_len;
2937
2938                         cm_node->state = I40IW_CM_STATE_OFFLOADED;
2939                         cm_node->tcp_cntxt.rcv_nxt =
2940                                 loopback_remotenode->tcp_cntxt.loc_seq_num;
2941                         loopback_remotenode->tcp_cntxt.rcv_nxt =
2942                                 cm_node->tcp_cntxt.loc_seq_num;
2943                         cm_node->tcp_cntxt.max_snd_wnd =
2944                                 loopback_remotenode->tcp_cntxt.rcv_wnd;
2945                         loopback_remotenode->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
2946                         cm_node->tcp_cntxt.snd_wnd = loopback_remotenode->tcp_cntxt.rcv_wnd;
2947                         loopback_remotenode->tcp_cntxt.snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
2948                         cm_node->tcp_cntxt.snd_wscale = loopback_remotenode->tcp_cntxt.rcv_wscale;
2949                         loopback_remotenode->tcp_cntxt.snd_wscale = cm_node->tcp_cntxt.rcv_wscale;
2950                 }
2951                 return cm_node;
2952         }
2953
2954         cm_node->pdata.size = private_data_len;
2955         cm_node->pdata.addr = cm_node->pdata_buf;
2956
2957         memcpy(cm_node->pdata_buf, private_data, private_data_len);
2958
2959         cm_node->state = I40IW_CM_STATE_SYN_SENT;
2960         return cm_node;
2961 }
2962
2963 /**
2964  * i40iw_cm_reject - reject and teardown a connection
2965  * @cm_node: connection's node
2966  * @pdate: ptr to private data for reject
2967  * @plen: size of private data
2968  */
2969 static int i40iw_cm_reject(struct i40iw_cm_node *cm_node, const void *pdata, u8 plen)
2970 {
2971         int ret = 0;
2972         int err;
2973         int passive_state;
2974         struct iw_cm_id *cm_id = cm_node->cm_id;
2975         struct i40iw_cm_node *loopback = cm_node->loopbackpartner;
2976
2977         if (cm_node->tcp_cntxt.client)
2978                 return ret;
2979         i40iw_cleanup_retrans_entry(cm_node);
2980
2981         if (!loopback) {
2982                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2983                 if (passive_state == I40IW_SEND_RESET_EVENT) {
2984                         cm_node->state = I40IW_CM_STATE_CLOSED;
2985                         i40iw_rem_ref_cm_node(cm_node);
2986                 } else {
2987                         if (cm_node->state == I40IW_CM_STATE_LISTENER_DESTROYED) {
2988                                 i40iw_rem_ref_cm_node(cm_node);
2989                         } else {
2990                                 ret = i40iw_send_mpa_reject(cm_node, pdata, plen);
2991                                 if (ret) {
2992                                         cm_node->state = I40IW_CM_STATE_CLOSED;
2993                                         err = i40iw_send_reset(cm_node);
2994                                         if (err)
2995                                                 i40iw_pr_err("send reset failed\n");
2996                                 } else {
2997                                         cm_id->add_ref(cm_id);
2998                                 }
2999                         }
3000                 }
3001         } else {
3002                 cm_node->cm_id = NULL;
3003                 if (cm_node->state == I40IW_CM_STATE_LISTENER_DESTROYED) {
3004                         i40iw_rem_ref_cm_node(cm_node);
3005                         i40iw_rem_ref_cm_node(loopback);
3006                 } else {
3007                         ret = i40iw_send_cm_event(loopback,
3008                                                   loopback->cm_id,
3009                                                   IW_CM_EVENT_CONNECT_REPLY,
3010                                                   -ECONNREFUSED);
3011                         i40iw_rem_ref_cm_node(cm_node);
3012                         loopback->state = I40IW_CM_STATE_CLOSING;
3013
3014                         cm_id = loopback->cm_id;
3015                         i40iw_rem_ref_cm_node(loopback);
3016                         cm_id->rem_ref(cm_id);
3017                 }
3018         }
3019
3020         return ret;
3021 }
3022
3023 /**
3024  * i40iw_cm_close - close of cm connection
3025  * @cm_node: connection's node
3026  */
3027 static int i40iw_cm_close(struct i40iw_cm_node *cm_node)
3028 {
3029         int ret = 0;
3030
3031         if (!cm_node)
3032                 return -EINVAL;
3033
3034         switch (cm_node->state) {
3035         case I40IW_CM_STATE_SYN_RCVD:
3036         case I40IW_CM_STATE_SYN_SENT:
3037         case I40IW_CM_STATE_ONE_SIDE_ESTABLISHED:
3038         case I40IW_CM_STATE_ESTABLISHED:
3039         case I40IW_CM_STATE_ACCEPTING:
3040         case I40IW_CM_STATE_MPAREQ_SENT:
3041         case I40IW_CM_STATE_MPAREQ_RCVD:
3042                 i40iw_cleanup_retrans_entry(cm_node);
3043                 i40iw_send_reset(cm_node);
3044                 break;
3045         case I40IW_CM_STATE_CLOSE_WAIT:
3046                 cm_node->state = I40IW_CM_STATE_LAST_ACK;
3047                 i40iw_send_fin(cm_node);
3048                 break;
3049         case I40IW_CM_STATE_FIN_WAIT1:
3050         case I40IW_CM_STATE_FIN_WAIT2:
3051         case I40IW_CM_STATE_LAST_ACK:
3052         case I40IW_CM_STATE_TIME_WAIT:
3053         case I40IW_CM_STATE_CLOSING:
3054                 ret = -1;
3055                 break;
3056         case I40IW_CM_STATE_LISTENING:
3057                 i40iw_cleanup_retrans_entry(cm_node);
3058                 i40iw_send_reset(cm_node);
3059                 break;
3060         case I40IW_CM_STATE_MPAREJ_RCVD:
3061         case I40IW_CM_STATE_UNKNOWN:
3062         case I40IW_CM_STATE_INITED:
3063         case I40IW_CM_STATE_CLOSED:
3064         case I40IW_CM_STATE_LISTENER_DESTROYED:
3065                 i40iw_rem_ref_cm_node(cm_node);
3066                 break;
3067         case I40IW_CM_STATE_OFFLOADED:
3068                 if (cm_node->send_entry)
3069                         i40iw_pr_err("send_entry\n");
3070                 i40iw_rem_ref_cm_node(cm_node);
3071                 break;
3072         }
3073         return ret;
3074 }
3075
3076 /**
3077  * i40iw_receive_ilq - recv an ETHERNET packet, and process it
3078  * through CM
3079  * @vsi: pointer to the vsi structure
3080  * @rbuf: receive buffer
3081  */
3082 void i40iw_receive_ilq(struct i40iw_sc_vsi *vsi, struct i40iw_puda_buf *rbuf)
3083 {
3084         struct i40iw_cm_node *cm_node;
3085         struct i40iw_cm_listener *listener;
3086         struct iphdr *iph;
3087         struct ipv6hdr *ip6h;
3088         struct tcphdr *tcph;
3089         struct i40iw_cm_info cm_info;
3090         struct i40iw_sc_dev *dev = vsi->dev;
3091         struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;
3092         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
3093         struct vlan_ethhdr *ethh;
3094         u16 vtag;
3095
3096         /* if vlan, then maclen = 18 else 14 */
3097         iph = (struct iphdr *)rbuf->iph;
3098         memset(&cm_info, 0, sizeof(cm_info));
3099
3100         i40iw_debug_buf(dev,
3101                         I40IW_DEBUG_ILQ,
3102                         "RECEIVE ILQ BUFFER",
3103                         rbuf->mem.va,
3104                         rbuf->totallen);
3105         ethh = (struct vlan_ethhdr *)rbuf->mem.va;
3106
3107         if (ethh->h_vlan_proto == htons(ETH_P_8021Q)) {
3108                 vtag = ntohs(ethh->h_vlan_TCI);
3109                 cm_info.user_pri = (vtag & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
3110                 cm_info.vlan_id = vtag & VLAN_VID_MASK;
3111                 i40iw_debug(cm_core->dev,
3112                             I40IW_DEBUG_CM,
3113                             "%s vlan_id=%d\n",
3114                             __func__,
3115                             cm_info.vlan_id);
3116         } else {
3117                 cm_info.vlan_id = I40IW_NO_VLAN;
3118         }
3119         tcph = (struct tcphdr *)rbuf->tcph;
3120
3121         if (rbuf->ipv4) {
3122                 cm_info.loc_addr[0] = ntohl(iph->daddr);
3123                 cm_info.rem_addr[0] = ntohl(iph->saddr);
3124                 cm_info.ipv4 = true;
3125                 cm_info.tos = iph->tos;
3126         } else {
3127                 ip6h = (struct ipv6hdr *)rbuf->iph;
3128                 i40iw_copy_ip_ntohl(cm_info.loc_addr,
3129                                     ip6h->daddr.in6_u.u6_addr32);
3130                 i40iw_copy_ip_ntohl(cm_info.rem_addr,
3131                                     ip6h->saddr.in6_u.u6_addr32);
3132                 cm_info.ipv4 = false;
3133                 cm_info.tos = (ip6h->priority << 4) | (ip6h->flow_lbl[0] >> 4);
3134         }
3135         cm_info.loc_port = ntohs(tcph->dest);
3136         cm_info.rem_port = ntohs(tcph->source);
3137         cm_node = i40iw_find_node(cm_core,
3138                                   cm_info.rem_port,
3139                                   cm_info.rem_addr,
3140                                   cm_info.loc_port,
3141                                   cm_info.loc_addr,
3142                                   true);
3143
3144         if (!cm_node) {
3145                 /* Only type of packet accepted are for */
3146                 /* the PASSIVE open (syn only) */
3147                 if (!tcph->syn || tcph->ack)
3148                         return;
3149                 listener =
3150                     i40iw_find_listener(cm_core,
3151                                         cm_info.loc_addr,
3152                                         cm_info.loc_port,
3153                                         cm_info.vlan_id,
3154                                         I40IW_CM_LISTENER_ACTIVE_STATE);
3155                 if (!listener) {
3156                         cm_info.cm_id = NULL;
3157                         i40iw_debug(cm_core->dev,
3158                                     I40IW_DEBUG_CM,
3159                                     "%s no listener found\n",
3160                                     __func__);
3161                         return;
3162                 }
3163                 cm_info.cm_id = listener->cm_id;
3164                 cm_node = i40iw_make_cm_node(cm_core, iwdev, &cm_info, listener);
3165                 if (!cm_node) {
3166                         i40iw_debug(cm_core->dev,
3167                                     I40IW_DEBUG_CM,
3168                                     "%s allocate node failed\n",
3169                                     __func__);
3170                         atomic_dec(&listener->ref_count);
3171                         return;
3172                 }
3173                 if (!tcph->rst && !tcph->fin) {
3174                         cm_node->state = I40IW_CM_STATE_LISTENING;
3175                 } else {
3176                         i40iw_rem_ref_cm_node(cm_node);
3177                         return;
3178                 }
3179                 atomic_inc(&cm_node->ref_count);
3180         } else if (cm_node->state == I40IW_CM_STATE_OFFLOADED) {
3181                 i40iw_rem_ref_cm_node(cm_node);
3182                 return;
3183         }
3184         i40iw_process_packet(cm_node, rbuf);
3185         i40iw_rem_ref_cm_node(cm_node);
3186 }
3187
3188 /**
3189  * i40iw_setup_cm_core - allocate a top level instance of a cm
3190  * core
3191  * @iwdev: iwarp device structure
3192  */
3193 void i40iw_setup_cm_core(struct i40iw_device *iwdev)
3194 {
3195         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
3196
3197         cm_core->iwdev = iwdev;
3198         cm_core->dev = &iwdev->sc_dev;
3199
3200         INIT_LIST_HEAD(&cm_core->connected_nodes);
3201         INIT_LIST_HEAD(&cm_core->listen_nodes);
3202
3203         timer_setup(&cm_core->tcp_timer, i40iw_cm_timer_tick, 0);
3204
3205         spin_lock_init(&cm_core->ht_lock);
3206         spin_lock_init(&cm_core->listen_list_lock);
3207
3208         cm_core->event_wq = alloc_ordered_workqueue("iwewq",
3209                                                     WQ_MEM_RECLAIM);
3210
3211         cm_core->disconn_wq = alloc_ordered_workqueue("iwdwq",
3212                                                       WQ_MEM_RECLAIM);
3213 }
3214
3215 /**
3216  * i40iw_cleanup_cm_core - deallocate a top level instance of a
3217  * cm core
3218  * @cm_core: cm's core
3219  */
3220 void i40iw_cleanup_cm_core(struct i40iw_cm_core *cm_core)
3221 {
3222         unsigned long flags;
3223
3224         if (!cm_core)
3225                 return;
3226
3227         spin_lock_irqsave(&cm_core->ht_lock, flags);
3228         if (timer_pending(&cm_core->tcp_timer))
3229                 del_timer_sync(&cm_core->tcp_timer);
3230         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
3231
3232         destroy_workqueue(cm_core->event_wq);
3233         destroy_workqueue(cm_core->disconn_wq);
3234 }
3235
3236 /**
3237  * i40iw_init_tcp_ctx - setup qp context
3238  * @cm_node: connection's node
3239  * @tcp_info: offload info for tcp
3240  * @iwqp: associate qp for the connection
3241  */
3242 static void i40iw_init_tcp_ctx(struct i40iw_cm_node *cm_node,
3243                                struct i40iw_tcp_offload_info *tcp_info,
3244                                struct i40iw_qp *iwqp)
3245 {
3246         tcp_info->ipv4 = cm_node->ipv4;
3247         tcp_info->drop_ooo_seg = true;
3248         tcp_info->wscale = true;
3249         tcp_info->ignore_tcp_opt = true;
3250         tcp_info->ignore_tcp_uns_opt = true;
3251         tcp_info->no_nagle = false;
3252
3253         tcp_info->ttl = I40IW_DEFAULT_TTL;
3254         tcp_info->rtt_var = cpu_to_le32(I40IW_DEFAULT_RTT_VAR);
3255         tcp_info->ss_thresh = cpu_to_le32(I40IW_DEFAULT_SS_THRESH);
3256         tcp_info->rexmit_thresh = I40IW_DEFAULT_REXMIT_THRESH;
3257
3258         tcp_info->tcp_state = I40IW_TCP_STATE_ESTABLISHED;
3259         tcp_info->snd_wscale = cm_node->tcp_cntxt.snd_wscale;
3260         tcp_info->rcv_wscale = cm_node->tcp_cntxt.rcv_wscale;
3261
3262         tcp_info->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3263         tcp_info->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
3264         tcp_info->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
3265         tcp_info->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3266
3267         tcp_info->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3268         tcp_info->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
3269         tcp_info->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
3270         tcp_info->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3271         tcp_info->max_snd_window = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
3272         tcp_info->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
3273                                         cm_node->tcp_cntxt.rcv_wscale);
3274
3275         tcp_info->flow_label = 0;
3276         tcp_info->snd_mss = cpu_to_le32(((u32)cm_node->tcp_cntxt.mss));
3277         if (cm_node->vlan_id < VLAN_TAG_PRESENT) {
3278                 tcp_info->insert_vlan_tag = true;
3279                 tcp_info->vlan_tag = cpu_to_le16(((u16)cm_node->user_pri << I40IW_VLAN_PRIO_SHIFT) |
3280                                                   cm_node->vlan_id);
3281         }
3282         if (cm_node->ipv4) {
3283                 tcp_info->src_port = cpu_to_le16(cm_node->loc_port);
3284                 tcp_info->dst_port = cpu_to_le16(cm_node->rem_port);
3285
3286                 tcp_info->dest_ip_addr3 = cpu_to_le32(cm_node->rem_addr[0]);
3287                 tcp_info->local_ipaddr3 = cpu_to_le32(cm_node->loc_addr[0]);
3288                 tcp_info->arp_idx =
3289                         cpu_to_le16((u16)i40iw_arp_table(
3290                                                          iwqp->iwdev,
3291                                                          &tcp_info->dest_ip_addr3,
3292                                                          true,
3293                                                          NULL,
3294                                                          I40IW_ARP_RESOLVE));
3295         } else {
3296                 tcp_info->src_port = cpu_to_le16(cm_node->loc_port);
3297                 tcp_info->dst_port = cpu_to_le16(cm_node->rem_port);
3298                 tcp_info->dest_ip_addr0 = cpu_to_le32(cm_node->rem_addr[0]);
3299                 tcp_info->dest_ip_addr1 = cpu_to_le32(cm_node->rem_addr[1]);
3300                 tcp_info->dest_ip_addr2 = cpu_to_le32(cm_node->rem_addr[2]);
3301                 tcp_info->dest_ip_addr3 = cpu_to_le32(cm_node->rem_addr[3]);
3302                 tcp_info->local_ipaddr0 = cpu_to_le32(cm_node->loc_addr[0]);
3303                 tcp_info->local_ipaddr1 = cpu_to_le32(cm_node->loc_addr[1]);
3304                 tcp_info->local_ipaddr2 = cpu_to_le32(cm_node->loc_addr[2]);
3305                 tcp_info->local_ipaddr3 = cpu_to_le32(cm_node->loc_addr[3]);
3306                 tcp_info->arp_idx =
3307                         cpu_to_le16((u16)i40iw_arp_table(
3308                                                          iwqp->iwdev,
3309                                                          &tcp_info->dest_ip_addr0,
3310                                                          false,
3311                                                          NULL,
3312                                                          I40IW_ARP_RESOLVE));
3313         }
3314 }
3315
3316 /**
3317  * i40iw_cm_init_tsa_conn - setup qp for RTS
3318  * @iwqp: associate qp for the connection
3319  * @cm_node: connection's node
3320  */
3321 static void i40iw_cm_init_tsa_conn(struct i40iw_qp *iwqp,
3322                                    struct i40iw_cm_node *cm_node)
3323 {
3324         struct i40iw_tcp_offload_info tcp_info;
3325         struct i40iwarp_offload_info *iwarp_info;
3326         struct i40iw_qp_host_ctx_info *ctx_info;
3327         struct i40iw_device *iwdev = iwqp->iwdev;
3328         struct i40iw_sc_dev *dev = &iwqp->iwdev->sc_dev;
3329
3330         memset(&tcp_info, 0x00, sizeof(struct i40iw_tcp_offload_info));
3331         iwarp_info = &iwqp->iwarp_info;
3332         ctx_info = &iwqp->ctx_info;
3333
3334         ctx_info->tcp_info = &tcp_info;
3335         ctx_info->send_cq_num = iwqp->iwscq->sc_cq.cq_uk.cq_id;
3336         ctx_info->rcv_cq_num = iwqp->iwrcq->sc_cq.cq_uk.cq_id;
3337
3338         iwarp_info->ord_size = cm_node->ord_size;
3339         iwarp_info->ird_size = i40iw_derive_hw_ird_setting(cm_node->ird_size);
3340
3341         if (iwarp_info->ord_size == 1)
3342                 iwarp_info->ord_size = 2;
3343
3344         iwarp_info->rd_enable = true;
3345         iwarp_info->rdmap_ver = 1;
3346         iwarp_info->ddp_ver = 1;
3347
3348         iwarp_info->pd_id = iwqp->iwpd->sc_pd.pd_id;
3349
3350         ctx_info->tcp_info_valid = true;
3351         ctx_info->iwarp_info_valid = true;
3352         ctx_info->add_to_qoslist = true;
3353         ctx_info->user_pri = cm_node->user_pri;
3354
3355         i40iw_init_tcp_ctx(cm_node, &tcp_info, iwqp);
3356         if (cm_node->snd_mark_en) {
3357                 iwarp_info->snd_mark_en = true;
3358                 iwarp_info->snd_mark_offset = (tcp_info.snd_nxt &
3359                                 SNDMARKER_SEQNMASK) + cm_node->lsmm_size;
3360         }
3361
3362         cm_node->state = I40IW_CM_STATE_OFFLOADED;
3363         tcp_info.tcp_state = I40IW_TCP_STATE_ESTABLISHED;
3364         tcp_info.src_mac_addr_idx = iwdev->mac_ip_table_idx;
3365         tcp_info.tos = cm_node->tos;
3366
3367         dev->iw_priv_qp_ops->qp_setctx(&iwqp->sc_qp, (u64 *)(iwqp->host_ctx.va), ctx_info);
3368
3369         /* once tcp_info is set, no need to do it again */
3370         ctx_info->tcp_info_valid = false;
3371         ctx_info->iwarp_info_valid = false;
3372         ctx_info->add_to_qoslist = false;
3373 }
3374
3375 /**
3376  * i40iw_cm_disconn - when a connection is being closed
3377  * @iwqp: associate qp for the connection
3378  */
3379 void i40iw_cm_disconn(struct i40iw_qp *iwqp)
3380 {
3381         struct disconn_work *work;
3382         struct i40iw_device *iwdev = iwqp->iwdev;
3383         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
3384         unsigned long flags;
3385
3386         work = kzalloc(sizeof(*work), GFP_ATOMIC);
3387         if (!work)
3388                 return; /* Timer will clean up */
3389
3390         spin_lock_irqsave(&iwdev->qptable_lock, flags);
3391         if (!iwdev->qp_table[iwqp->ibqp.qp_num]) {
3392                 spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
3393                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM,
3394                             "%s qp_id %d is already freed\n",
3395                              __func__, iwqp->ibqp.qp_num);
3396                 kfree(work);
3397                 return;
3398         }
3399         i40iw_add_ref(&iwqp->ibqp);
3400         spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
3401
3402         work->iwqp = iwqp;
3403         INIT_WORK(&work->work, i40iw_disconnect_worker);
3404         queue_work(cm_core->disconn_wq, &work->work);
3405         return;
3406 }
3407
3408 /**
3409  * i40iw_qp_disconnect - free qp and close cm
3410  * @iwqp: associate qp for the connection
3411  */
3412 static void i40iw_qp_disconnect(struct i40iw_qp *iwqp)
3413 {
3414         struct i40iw_device *iwdev;
3415         struct i40iw_ib_device *iwibdev;
3416
3417         iwdev = to_iwdev(iwqp->ibqp.device);
3418         if (!iwdev) {
3419                 i40iw_pr_err("iwdev == NULL\n");
3420                 return;
3421         }
3422
3423         iwibdev = iwdev->iwibdev;
3424
3425         if (iwqp->active_conn) {
3426                 /* indicate this connection is NOT active */
3427                 iwqp->active_conn = 0;
3428         } else {
3429                 /* Need to free the Last Streaming Mode Message */
3430                 if (iwqp->ietf_mem.va) {
3431                         if (iwqp->lsmm_mr)
3432                                 iwibdev->ibdev.dereg_mr(iwqp->lsmm_mr);
3433                         i40iw_free_dma_mem(iwdev->sc_dev.hw, &iwqp->ietf_mem);
3434                 }
3435         }
3436
3437         /* close the CM node down if it is still active */
3438         if (iwqp->cm_node) {
3439                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM, "%s Call close API\n", __func__);
3440                 i40iw_cm_close(iwqp->cm_node);
3441         }
3442 }
3443
3444 /**
3445  * i40iw_cm_disconn_true - called by worker thread to disconnect qp
3446  * @iwqp: associate qp for the connection
3447  */
3448 static void i40iw_cm_disconn_true(struct i40iw_qp *iwqp)
3449 {
3450         struct iw_cm_id *cm_id;
3451         struct i40iw_device *iwdev;
3452         struct i40iw_sc_qp *qp = &iwqp->sc_qp;
3453         u16 last_ae;
3454         u8 original_hw_tcp_state;
3455         u8 original_ibqp_state;
3456         int disconn_status = 0;
3457         int issue_disconn = 0;
3458         int issue_close = 0;
3459         int issue_flush = 0;
3460         struct ib_event ibevent;
3461         unsigned long flags;
3462         int ret;
3463
3464         if (!iwqp) {
3465                 i40iw_pr_err("iwqp == NULL\n");
3466                 return;
3467         }
3468
3469         spin_lock_irqsave(&iwqp->lock, flags);
3470         cm_id = iwqp->cm_id;
3471         /* make sure we havent already closed this connection */
3472         if (!cm_id) {
3473                 spin_unlock_irqrestore(&iwqp->lock, flags);
3474                 return;
3475         }
3476
3477         iwdev = to_iwdev(iwqp->ibqp.device);
3478
3479         original_hw_tcp_state = iwqp->hw_tcp_state;
3480         original_ibqp_state = iwqp->ibqp_state;
3481         last_ae = iwqp->last_aeq;
3482
3483         if (qp->term_flags) {
3484                 issue_disconn = 1;
3485                 issue_close = 1;
3486                 iwqp->cm_id = NULL;
3487                 /*When term timer expires after cm_timer, don't want
3488                  *terminate-handler to issue cm_disconn which can re-free
3489                  *a QP even after its refcnt=0.
3490                  */
3491                 i40iw_terminate_del_timer(qp);
3492                 if (!iwqp->flush_issued) {
3493                         iwqp->flush_issued = 1;
3494                         issue_flush = 1;
3495                 }
3496         } else if ((original_hw_tcp_state == I40IW_TCP_STATE_CLOSE_WAIT) ||
3497                    ((original_ibqp_state == IB_QPS_RTS) &&
3498                     (last_ae == I40IW_AE_LLP_CONNECTION_RESET))) {
3499                 issue_disconn = 1;
3500                 if (last_ae == I40IW_AE_LLP_CONNECTION_RESET)
3501                         disconn_status = -ECONNRESET;
3502         }
3503
3504         if (((original_hw_tcp_state == I40IW_TCP_STATE_CLOSED) ||
3505              (original_hw_tcp_state == I40IW_TCP_STATE_TIME_WAIT) ||
3506              (last_ae == I40IW_AE_RDMAP_ROE_BAD_LLP_CLOSE) ||
3507              (last_ae == I40IW_AE_LLP_CONNECTION_RESET) ||
3508               iwdev->reset)) {
3509                 issue_close = 1;
3510                 iwqp->cm_id = NULL;
3511                 if (!iwqp->flush_issued) {
3512                         iwqp->flush_issued = 1;
3513                         issue_flush = 1;
3514                 }
3515         }
3516
3517         spin_unlock_irqrestore(&iwqp->lock, flags);
3518         if (issue_flush && !iwqp->destroyed) {
3519                 /* Flush the queues */
3520                 i40iw_flush_wqes(iwdev, iwqp);
3521
3522                 if (qp->term_flags && iwqp->ibqp.event_handler) {
3523                         ibevent.device = iwqp->ibqp.device;
3524                         ibevent.event = (qp->eventtype == TERM_EVENT_QP_FATAL) ?
3525                                         IB_EVENT_QP_FATAL : IB_EVENT_QP_ACCESS_ERR;
3526                         ibevent.element.qp = &iwqp->ibqp;
3527                         iwqp->ibqp.event_handler(&ibevent, iwqp->ibqp.qp_context);
3528                 }
3529         }
3530
3531         if (cm_id && cm_id->event_handler) {
3532                 if (issue_disconn) {
3533                         ret = i40iw_send_cm_event(NULL,
3534                                                   cm_id,
3535                                                   IW_CM_EVENT_DISCONNECT,
3536                                                   disconn_status);
3537
3538                         if (ret)
3539                                 i40iw_debug(&iwdev->sc_dev,
3540                                             I40IW_DEBUG_CM,
3541                                             "disconnect event failed %s: - cm_id = %p\n",
3542                                             __func__, cm_id);
3543                 }
3544                 if (issue_close) {
3545                         i40iw_qp_disconnect(iwqp);
3546                         cm_id->provider_data = iwqp;
3547                         ret = i40iw_send_cm_event(NULL, cm_id, IW_CM_EVENT_CLOSE, 0);
3548                         if (ret)
3549                                 i40iw_debug(&iwdev->sc_dev,
3550                                             I40IW_DEBUG_CM,
3551                                             "close event failed %s: - cm_id = %p\n",
3552                                             __func__, cm_id);
3553                         cm_id->rem_ref(cm_id);
3554                 }
3555         }
3556 }
3557
3558 /**
3559  * i40iw_disconnect_worker - worker for connection close
3560  * @work: points or disconn structure
3561  */
3562 static void i40iw_disconnect_worker(struct work_struct *work)
3563 {
3564         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
3565         struct i40iw_qp *iwqp = dwork->iwqp;
3566
3567         kfree(dwork);
3568         i40iw_cm_disconn_true(iwqp);
3569         i40iw_rem_ref(&iwqp->ibqp);
3570 }
3571
3572 /**
3573  * i40iw_accept - registered call for connection to be accepted
3574  * @cm_id: cm information for passive connection
3575  * @conn_param: accpet parameters
3576  */
3577 int i40iw_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3578 {
3579         struct ib_qp *ibqp;
3580         struct i40iw_qp *iwqp;
3581         struct i40iw_device *iwdev;
3582         struct i40iw_sc_dev *dev;
3583         struct i40iw_cm_node *cm_node;
3584         struct ib_qp_attr attr;
3585         int passive_state;
3586         struct ib_mr *ibmr;
3587         struct i40iw_pd *iwpd;
3588         u16 buf_len = 0;
3589         struct i40iw_kmem_info accept;
3590         enum i40iw_status_code status;
3591         u64 tagged_offset;
3592
3593         memset(&attr, 0, sizeof(attr));
3594         ibqp = i40iw_get_qp(cm_id->device, conn_param->qpn);
3595         if (!ibqp)
3596                 return -EINVAL;
3597
3598         iwqp = to_iwqp(ibqp);
3599         iwdev = iwqp->iwdev;
3600         dev = &iwdev->sc_dev;
3601         cm_node = (struct i40iw_cm_node *)cm_id->provider_data;
3602
3603         if (((struct sockaddr_in *)&cm_id->local_addr)->sin_family == AF_INET) {
3604                 cm_node->ipv4 = true;
3605                 cm_node->vlan_id = i40iw_get_vlan_ipv4(cm_node->loc_addr);
3606         } else {
3607                 cm_node->ipv4 = false;
3608                 i40iw_netdev_vlan_ipv6(cm_node->loc_addr, &cm_node->vlan_id);
3609         }
3610         i40iw_debug(cm_node->dev,
3611                     I40IW_DEBUG_CM,
3612                     "Accept vlan_id=%d\n",
3613                     cm_node->vlan_id);
3614         if (cm_node->state == I40IW_CM_STATE_LISTENER_DESTROYED) {
3615                 if (cm_node->loopbackpartner)
3616                         i40iw_rem_ref_cm_node(cm_node->loopbackpartner);
3617                 i40iw_rem_ref_cm_node(cm_node);
3618                 return -EINVAL;
3619         }
3620
3621         passive_state = atomic_add_return(1, &cm_node->passive_state);
3622         if (passive_state == I40IW_SEND_RESET_EVENT) {
3623                 i40iw_rem_ref_cm_node(cm_node);
3624                 return -ECONNRESET;
3625         }
3626
3627         cm_node->cm_core->stats_accepts++;
3628         iwqp->cm_node = (void *)cm_node;
3629         cm_node->iwqp = iwqp;
3630
3631         buf_len = conn_param->private_data_len + I40IW_MAX_IETF_SIZE;
3632
3633         status = i40iw_allocate_dma_mem(dev->hw, &iwqp->ietf_mem, buf_len, 1);
3634
3635         if (status)
3636                 return -ENOMEM;
3637         cm_node->pdata.size = conn_param->private_data_len;
3638         accept.addr = iwqp->ietf_mem.va;
3639         accept.size = i40iw_cm_build_mpa_frame(cm_node, &accept, MPA_KEY_REPLY);
3640         memcpy(accept.addr + accept.size, conn_param->private_data,
3641                conn_param->private_data_len);
3642
3643         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3644         if ((cm_node->ipv4 &&
3645              !i40iw_ipv4_is_loopback(cm_node->loc_addr[0], cm_node->rem_addr[0])) ||
3646             (!cm_node->ipv4 &&
3647              !i40iw_ipv6_is_loopback(cm_node->loc_addr, cm_node->rem_addr))) {
3648                 iwpd = iwqp->iwpd;
3649                 tagged_offset = (uintptr_t)iwqp->ietf_mem.va;
3650                 ibmr = i40iw_reg_phys_mr(&iwpd->ibpd,
3651                                          iwqp->ietf_mem.pa,
3652                                          buf_len,
3653                                          IB_ACCESS_LOCAL_WRITE,
3654                                          &tagged_offset);
3655                 if (IS_ERR(ibmr)) {
3656                         i40iw_free_dma_mem(dev->hw, &iwqp->ietf_mem);
3657                         return -ENOMEM;
3658                 }
3659
3660                 ibmr->pd = &iwpd->ibpd;
3661                 ibmr->device = iwpd->ibpd.device;
3662                 iwqp->lsmm_mr = ibmr;
3663                 if (iwqp->page)
3664                         iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
3665                 dev->iw_priv_qp_ops->qp_send_lsmm(&iwqp->sc_qp,
3666                                                         iwqp->ietf_mem.va,
3667                                                         (accept.size + conn_param->private_data_len),
3668                                                         ibmr->lkey);
3669
3670         } else {
3671                 if (iwqp->page)
3672                         iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
3673                 dev->iw_priv_qp_ops->qp_send_lsmm(&iwqp->sc_qp, NULL, 0, 0);
3674         }
3675
3676         if (iwqp->page)
3677                 kunmap(iwqp->page);
3678
3679         iwqp->cm_id = cm_id;
3680         cm_node->cm_id = cm_id;
3681
3682         cm_id->provider_data = (void *)iwqp;
3683         iwqp->active_conn = 0;
3684
3685         cm_node->lsmm_size = accept.size + conn_param->private_data_len;
3686         i40iw_cm_init_tsa_conn(iwqp, cm_node);
3687         cm_id->add_ref(cm_id);
3688         i40iw_add_ref(&iwqp->ibqp);
3689
3690         attr.qp_state = IB_QPS_RTS;
3691         cm_node->qhash_set = false;
3692         i40iw_modify_qp(&iwqp->ibqp, &attr, IB_QP_STATE, NULL);
3693
3694         cm_node->accelerated = 1;
3695         status =
3696                 i40iw_send_cm_event(cm_node, cm_id, IW_CM_EVENT_ESTABLISHED, 0);
3697         if (status)
3698                 i40iw_debug(dev, I40IW_DEBUG_CM, "error sending cm event - ESTABLISHED\n");
3699
3700         if (cm_node->loopbackpartner) {
3701                 cm_node->loopbackpartner->pdata.size = conn_param->private_data_len;
3702
3703                 /* copy entire MPA frame to our cm_node's frame */
3704                 memcpy(cm_node->loopbackpartner->pdata_buf,
3705                        conn_param->private_data,
3706                        conn_param->private_data_len);
3707                 i40iw_create_event(cm_node->loopbackpartner, I40IW_CM_EVENT_CONNECTED);
3708         }
3709
3710         if (cm_node->accept_pend) {
3711                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
3712                 cm_node->accept_pend = 0;
3713         }
3714         return 0;
3715 }
3716
3717 /**
3718  * i40iw_reject - registered call for connection to be rejected
3719  * @cm_id: cm information for passive connection
3720  * @pdata: private data to be sent
3721  * @pdata_len: private data length
3722  */
3723 int i40iw_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3724 {
3725         struct i40iw_device *iwdev;
3726         struct i40iw_cm_node *cm_node;
3727         struct i40iw_cm_node *loopback;
3728
3729         cm_node = (struct i40iw_cm_node *)cm_id->provider_data;
3730         loopback = cm_node->loopbackpartner;
3731         cm_node->cm_id = cm_id;
3732         cm_node->pdata.size = pdata_len;
3733
3734         iwdev = to_iwdev(cm_id->device);
3735         if (!iwdev)
3736                 return -EINVAL;
3737         cm_node->cm_core->stats_rejects++;
3738
3739         if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3740                 return -EINVAL;
3741
3742         if (loopback) {
3743                 memcpy(&loopback->pdata_buf, pdata, pdata_len);
3744                 loopback->pdata.size = pdata_len;
3745         }
3746
3747         return i40iw_cm_reject(cm_node, pdata, pdata_len);
3748 }
3749
3750 /**
3751  * i40iw_connect - registered call for connection to be established
3752  * @cm_id: cm information for passive connection
3753  * @conn_param: Information about the connection
3754  */
3755 int i40iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3756 {
3757         struct ib_qp *ibqp;
3758         struct i40iw_qp *iwqp;
3759         struct i40iw_device *iwdev;
3760         struct i40iw_cm_node *cm_node;
3761         struct i40iw_cm_info cm_info;
3762         struct sockaddr_in *laddr;
3763         struct sockaddr_in *raddr;
3764         struct sockaddr_in6 *laddr6;
3765         struct sockaddr_in6 *raddr6;
3766         int ret = 0;
3767         unsigned long flags;
3768
3769         ibqp = i40iw_get_qp(cm_id->device, conn_param->qpn);
3770         if (!ibqp)
3771                 return -EINVAL;
3772         iwqp = to_iwqp(ibqp);
3773         if (!iwqp)
3774                 return -EINVAL;
3775         iwdev = to_iwdev(iwqp->ibqp.device);
3776         if (!iwdev)
3777                 return -EINVAL;
3778
3779         laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3780         raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3781         laddr6 = (struct sockaddr_in6 *)&cm_id->m_local_addr;
3782         raddr6 = (struct sockaddr_in6 *)&cm_id->m_remote_addr;
3783
3784         if (!(laddr->sin_port) || !(raddr->sin_port))
3785                 return -EINVAL;
3786
3787         iwqp->active_conn = 1;
3788         iwqp->cm_id = NULL;
3789         cm_id->provider_data = iwqp;
3790
3791         /* set up the connection params for the node */
3792         if (cm_id->remote_addr.ss_family == AF_INET) {
3793                 cm_info.ipv4 = true;
3794                 memset(cm_info.loc_addr, 0, sizeof(cm_info.loc_addr));
3795                 memset(cm_info.rem_addr, 0, sizeof(cm_info.rem_addr));
3796                 cm_info.loc_addr[0] = ntohl(laddr->sin_addr.s_addr);
3797                 cm_info.rem_addr[0] = ntohl(raddr->sin_addr.s_addr);
3798                 cm_info.loc_port = ntohs(laddr->sin_port);
3799                 cm_info.rem_port = ntohs(raddr->sin_port);
3800                 cm_info.vlan_id = i40iw_get_vlan_ipv4(cm_info.loc_addr);
3801         } else {
3802                 cm_info.ipv4 = false;
3803                 i40iw_copy_ip_ntohl(cm_info.loc_addr,
3804                                     laddr6->sin6_addr.in6_u.u6_addr32);
3805                 i40iw_copy_ip_ntohl(cm_info.rem_addr,
3806                                     raddr6->sin6_addr.in6_u.u6_addr32);
3807                 cm_info.loc_port = ntohs(laddr6->sin6_port);
3808                 cm_info.rem_port = ntohs(raddr6->sin6_port);
3809                 i40iw_netdev_vlan_ipv6(cm_info.loc_addr, &cm_info.vlan_id);
3810         }
3811         cm_info.cm_id = cm_id;
3812         cm_info.tos = cm_id->tos;
3813         cm_info.user_pri = rt_tos2priority(cm_id->tos);
3814         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB, "%s TOS:[%d] UP:[%d]\n",
3815                     __func__, cm_id->tos, cm_info.user_pri);
3816         cm_id->add_ref(cm_id);
3817         cm_node = i40iw_create_cm_node(&iwdev->cm_core, iwdev,
3818                                        conn_param->private_data_len,
3819                                        (void *)conn_param->private_data,
3820                                        &cm_info);
3821
3822         if (IS_ERR(cm_node)) {
3823                 ret = PTR_ERR(cm_node);
3824                 cm_id->rem_ref(cm_id);
3825                 return ret;
3826         }
3827
3828         if ((cm_info.ipv4 && (laddr->sin_addr.s_addr != raddr->sin_addr.s_addr)) ||
3829             (!cm_info.ipv4 && memcmp(laddr6->sin6_addr.in6_u.u6_addr32,
3830                                      raddr6->sin6_addr.in6_u.u6_addr32,
3831                                      sizeof(laddr6->sin6_addr.in6_u.u6_addr32)))) {
3832                 if (i40iw_manage_qhash(iwdev, &cm_info, I40IW_QHASH_TYPE_TCP_ESTABLISHED,
3833                                        I40IW_QHASH_MANAGE_TYPE_ADD, NULL, true)) {
3834                         ret = -EINVAL;
3835                         goto err;
3836                 }
3837                 cm_node->qhash_set = true;
3838         }
3839
3840         spin_lock_irqsave(&iwdev->cm_core.ht_lock, flags);
3841         if (!test_and_set_bit(cm_info.loc_port, iwdev->cm_core.active_side_ports)) {
3842                 spin_unlock_irqrestore(&iwdev->cm_core.ht_lock, flags);
3843                 if (i40iw_manage_apbvt(iwdev, cm_info.loc_port, I40IW_MANAGE_APBVT_ADD)) {
3844                         ret =  -EINVAL;
3845                         goto err;
3846                 }
3847         } else {
3848                 spin_unlock_irqrestore(&iwdev->cm_core.ht_lock, flags);
3849         }
3850
3851         cm_node->apbvt_set = true;
3852         i40iw_record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3853         if (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO &&
3854             !cm_node->ord_size)
3855                 cm_node->ord_size = 1;
3856
3857         iwqp->cm_node = cm_node;
3858         cm_node->iwqp = iwqp;
3859         iwqp->cm_id = cm_id;
3860         i40iw_add_ref(&iwqp->ibqp);
3861
3862         if (cm_node->state != I40IW_CM_STATE_OFFLOADED) {
3863                 cm_node->state = I40IW_CM_STATE_SYN_SENT;
3864                 ret = i40iw_send_syn(cm_node, 0);
3865                 if (ret)
3866                         goto err;
3867         }
3868
3869         if (cm_node->loopbackpartner) {
3870                 cm_node->loopbackpartner->state = I40IW_CM_STATE_MPAREQ_RCVD;
3871                 i40iw_create_event(cm_node->loopbackpartner,
3872                                    I40IW_CM_EVENT_MPA_REQ);
3873         }
3874
3875         i40iw_debug(cm_node->dev,
3876                     I40IW_DEBUG_CM,
3877                     "Api - connect(): port=0x%04x, cm_node=%p, cm_id = %p.\n",
3878                     cm_node->rem_port,
3879                     cm_node,
3880                     cm_node->cm_id);
3881
3882         return 0;
3883
3884 err:
3885         if (cm_info.ipv4)
3886                 i40iw_debug(&iwdev->sc_dev,
3887                             I40IW_DEBUG_CM,
3888                             "Api - connect() FAILED: dest addr=%pI4",
3889                             cm_info.rem_addr);
3890         else
3891                 i40iw_debug(&iwdev->sc_dev,
3892                             I40IW_DEBUG_CM,
3893                             "Api - connect() FAILED: dest addr=%pI6",
3894                             cm_info.rem_addr);
3895
3896         i40iw_rem_ref_cm_node(cm_node);
3897         cm_id->rem_ref(cm_id);
3898         iwdev->cm_core.stats_connect_errs++;
3899         return ret;
3900 }
3901
3902 /**
3903  * i40iw_create_listen - registered call creating listener
3904  * @cm_id: cm information for passive connection
3905  * @backlog: to max accept pending count
3906  */
3907 int i40iw_create_listen(struct iw_cm_id *cm_id, int backlog)
3908 {
3909         struct i40iw_device *iwdev;
3910         struct i40iw_cm_listener *cm_listen_node;
3911         struct i40iw_cm_info cm_info;
3912         enum i40iw_status_code ret;
3913         struct sockaddr_in *laddr;
3914         struct sockaddr_in6 *laddr6;
3915         bool wildcard = false;
3916
3917         iwdev = to_iwdev(cm_id->device);
3918         if (!iwdev)
3919                 return -EINVAL;
3920
3921         laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3922         laddr6 = (struct sockaddr_in6 *)&cm_id->m_local_addr;
3923         memset(&cm_info, 0, sizeof(cm_info));
3924         if (laddr->sin_family == AF_INET) {
3925                 cm_info.ipv4 = true;
3926                 cm_info.loc_addr[0] = ntohl(laddr->sin_addr.s_addr);
3927                 cm_info.loc_port = ntohs(laddr->sin_port);
3928
3929                 if (laddr->sin_addr.s_addr != INADDR_ANY)
3930                         cm_info.vlan_id = i40iw_get_vlan_ipv4(cm_info.loc_addr);
3931                 else
3932                         wildcard = true;
3933
3934         } else {
3935                 cm_info.ipv4 = false;
3936                 i40iw_copy_ip_ntohl(cm_info.loc_addr,
3937                                     laddr6->sin6_addr.in6_u.u6_addr32);
3938                 cm_info.loc_port = ntohs(laddr6->sin6_port);
3939                 if (ipv6_addr_type(&laddr6->sin6_addr) != IPV6_ADDR_ANY)
3940                         i40iw_netdev_vlan_ipv6(cm_info.loc_addr,
3941                                                &cm_info.vlan_id);
3942                 else
3943                         wildcard = true;
3944         }
3945         cm_info.backlog = backlog;
3946         cm_info.cm_id = cm_id;
3947
3948         cm_listen_node = i40iw_make_listen_node(&iwdev->cm_core, iwdev, &cm_info);
3949         if (!cm_listen_node) {
3950                 i40iw_pr_err("cm_listen_node == NULL\n");
3951                 return -ENOMEM;
3952         }
3953
3954         cm_id->provider_data = cm_listen_node;
3955
3956         cm_listen_node->tos = cm_id->tos;
3957         cm_listen_node->user_pri = rt_tos2priority(cm_id->tos);
3958         cm_info.user_pri = cm_listen_node->user_pri;
3959
3960         if (!cm_listen_node->reused_node) {
3961                 if (wildcard) {
3962                         if (cm_info.ipv4)
3963                                 ret = i40iw_add_mqh_4(iwdev,
3964                                                       &cm_info,
3965                                                       cm_listen_node);
3966                         else
3967                                 ret = i40iw_add_mqh_6(iwdev,
3968                                                       &cm_info,
3969                                                       cm_listen_node);
3970                         if (ret)
3971                                 goto error;
3972
3973                         ret = i40iw_manage_apbvt(iwdev,
3974                                                  cm_info.loc_port,
3975                                                  I40IW_MANAGE_APBVT_ADD);
3976
3977                         if (ret)
3978                                 goto error;
3979                 } else {
3980                         ret = i40iw_manage_qhash(iwdev,
3981                                                  &cm_info,
3982                                                  I40IW_QHASH_TYPE_TCP_SYN,
3983                                                  I40IW_QHASH_MANAGE_TYPE_ADD,
3984                                                  NULL,
3985                                                  true);
3986                         if (ret)
3987                                 goto error;
3988                         cm_listen_node->qhash_set = true;
3989                         ret = i40iw_manage_apbvt(iwdev,
3990                                                  cm_info.loc_port,
3991                                                  I40IW_MANAGE_APBVT_ADD);
3992                         if (ret)
3993                                 goto error;
3994                 }
3995         }
3996         cm_id->add_ref(cm_id);
3997         cm_listen_node->cm_core->stats_listen_created++;
3998         return 0;
3999  error:
4000         i40iw_cm_del_listen(&iwdev->cm_core, (void *)cm_listen_node, false);
4001         return -EINVAL;
4002 }
4003
4004 /**
4005  * i40iw_destroy_listen - registered call to destroy listener
4006  * @cm_id: cm information for passive connection
4007  */
4008 int i40iw_destroy_listen(struct iw_cm_id *cm_id)
4009 {
4010         struct i40iw_device *iwdev;
4011
4012         iwdev = to_iwdev(cm_id->device);
4013         if (cm_id->provider_data)
4014                 i40iw_cm_del_listen(&iwdev->cm_core, cm_id->provider_data, true);
4015         else
4016                 i40iw_pr_err("cm_id->provider_data was NULL\n");
4017
4018         cm_id->rem_ref(cm_id);
4019
4020         return 0;
4021 }
4022
4023 /**
4024  * i40iw_cm_event_connected - handle connected active node
4025  * @event: the info for cm_node of connection
4026  */
4027 static void i40iw_cm_event_connected(struct i40iw_cm_event *event)
4028 {
4029         struct i40iw_qp *iwqp;
4030         struct i40iw_device *iwdev;
4031         struct i40iw_cm_node *cm_node;
4032         struct i40iw_sc_dev *dev;
4033         struct ib_qp_attr attr;
4034         struct iw_cm_id *cm_id;
4035         int status;
4036         bool read0;
4037
4038         cm_node = event->cm_node;
4039         cm_id = cm_node->cm_id;
4040         iwqp = (struct i40iw_qp *)cm_id->provider_data;
4041         iwdev = to_iwdev(iwqp->ibqp.device);
4042         dev = &iwdev->sc_dev;
4043
4044         if (iwqp->destroyed) {
4045                 status = -ETIMEDOUT;
4046                 goto error;
4047         }
4048         i40iw_cm_init_tsa_conn(iwqp, cm_node);
4049         read0 = (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO);
4050         if (iwqp->page)
4051                 iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
4052         dev->iw_priv_qp_ops->qp_send_rtt(&iwqp->sc_qp, read0);
4053         if (iwqp->page)
4054                 kunmap(iwqp->page);
4055
4056         memset(&attr, 0, sizeof(attr));
4057         attr.qp_state = IB_QPS_RTS;
4058         cm_node->qhash_set = false;
4059         i40iw_modify_qp(&iwqp->ibqp, &attr, IB_QP_STATE, NULL);
4060
4061         cm_node->accelerated = 1;
4062         status = i40iw_send_cm_event(cm_node, cm_id, IW_CM_EVENT_CONNECT_REPLY,
4063                                      0);
4064         if (status)
4065                 i40iw_debug(dev, I40IW_DEBUG_CM, "error sending cm event - CONNECT_REPLY\n");
4066
4067         return;
4068
4069 error:
4070         iwqp->cm_id = NULL;
4071         cm_id->provider_data = NULL;
4072         i40iw_send_cm_event(event->cm_node,
4073                             cm_id,
4074                             IW_CM_EVENT_CONNECT_REPLY,
4075                             status);
4076         cm_id->rem_ref(cm_id);
4077         i40iw_rem_ref_cm_node(event->cm_node);
4078 }
4079
4080 /**
4081  * i40iw_cm_event_reset - handle reset
4082  * @event: the info for cm_node of connection
4083  */
4084 static void i40iw_cm_event_reset(struct i40iw_cm_event *event)
4085 {
4086         struct i40iw_cm_node *cm_node = event->cm_node;
4087         struct iw_cm_id   *cm_id = cm_node->cm_id;
4088         struct i40iw_qp *iwqp;
4089
4090         if (!cm_id)
4091                 return;
4092
4093         iwqp = cm_id->provider_data;
4094         if (!iwqp)
4095                 return;
4096
4097         i40iw_debug(cm_node->dev,
4098                     I40IW_DEBUG_CM,
4099                     "reset event %p - cm_id = %p\n",
4100                      event->cm_node, cm_id);
4101         iwqp->cm_id = NULL;
4102
4103         i40iw_send_cm_event(cm_node, cm_node->cm_id, IW_CM_EVENT_DISCONNECT, -ECONNRESET);
4104         i40iw_send_cm_event(cm_node, cm_node->cm_id, IW_CM_EVENT_CLOSE, 0);
4105 }
4106
4107 /**
4108  * i40iw_cm_event_handler - worker thread callback to send event to cm upper layer
4109  * @work: pointer of cm event info.
4110  */
4111 static void i40iw_cm_event_handler(struct work_struct *work)
4112 {
4113         struct i40iw_cm_event *event = container_of(work,
4114                                                     struct i40iw_cm_event,
4115                                                     event_work);
4116         struct i40iw_cm_node *cm_node;
4117
4118         if (!event || !event->cm_node || !event->cm_node->cm_core)
4119                 return;
4120
4121         cm_node = event->cm_node;
4122
4123         switch (event->type) {
4124         case I40IW_CM_EVENT_MPA_REQ:
4125                 i40iw_send_cm_event(cm_node,
4126                                     cm_node->cm_id,
4127                                     IW_CM_EVENT_CONNECT_REQUEST,
4128                                     0);
4129                 break;
4130         case I40IW_CM_EVENT_RESET:
4131                 i40iw_cm_event_reset(event);
4132                 break;
4133         case I40IW_CM_EVENT_CONNECTED:
4134                 if (!event->cm_node->cm_id ||
4135                     (event->cm_node->state != I40IW_CM_STATE_OFFLOADED))
4136                         break;
4137                 i40iw_cm_event_connected(event);
4138                 break;
4139         case I40IW_CM_EVENT_MPA_REJECT:
4140                 if (!event->cm_node->cm_id ||
4141                     (cm_node->state == I40IW_CM_STATE_OFFLOADED))
4142                         break;
4143                 i40iw_send_cm_event(cm_node,
4144                                     cm_node->cm_id,
4145                                     IW_CM_EVENT_CONNECT_REPLY,
4146                                     -ECONNREFUSED);
4147                 break;
4148         case I40IW_CM_EVENT_ABORTED:
4149                 if (!event->cm_node->cm_id ||
4150                     (event->cm_node->state == I40IW_CM_STATE_OFFLOADED))
4151                         break;
4152                 i40iw_event_connect_error(event);
4153                 break;
4154         default:
4155                 i40iw_pr_err("event type = %d\n", event->type);
4156                 break;
4157         }
4158
4159         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
4160         i40iw_rem_ref_cm_node(event->cm_node);
4161         kfree(event);
4162 }
4163
4164 /**
4165  * i40iw_cm_post_event - queue event request for worker thread
4166  * @event: cm node's info for up event call
4167  */
4168 static void i40iw_cm_post_event(struct i40iw_cm_event *event)
4169 {
4170         atomic_inc(&event->cm_node->ref_count);
4171         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
4172         INIT_WORK(&event->event_work, i40iw_cm_event_handler);
4173
4174         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
4175 }
4176
4177 /**
4178  * i40iw_qhash_ctrl - enable/disable qhash for list
4179  * @iwdev: device pointer
4180  * @parent_listen_node: parent listen node
4181  * @nfo: cm info node
4182  * @ipaddr: Pointer to IPv4 or IPv6 address
4183  * @ipv4: flag indicating IPv4 when true
4184  * @ifup: flag indicating interface up when true
4185  *
4186  * Enables or disables the qhash for the node in the child
4187  * listen list that matches ipaddr. If no matching IP was found
4188  * it will allocate and add a new child listen node to the
4189  * parent listen node. The listen_list_lock is assumed to be
4190  * held when called.
4191  */
4192 static void i40iw_qhash_ctrl(struct i40iw_device *iwdev,
4193                              struct i40iw_cm_listener *parent_listen_node,
4194                              struct i40iw_cm_info *nfo,
4195                              u32 *ipaddr, bool ipv4, bool ifup)
4196 {
4197         struct list_head *child_listen_list = &parent_listen_node->child_listen_list;
4198         struct i40iw_cm_listener *child_listen_node;
4199         struct list_head *pos, *tpos;
4200         enum i40iw_status_code ret;
4201         bool node_allocated = false;
4202         enum i40iw_quad_hash_manage_type op =
4203                 ifup ? I40IW_QHASH_MANAGE_TYPE_ADD : I40IW_QHASH_MANAGE_TYPE_DELETE;
4204
4205         list_for_each_safe(pos, tpos, child_listen_list) {
4206                 child_listen_node =
4207                         list_entry(pos,
4208                                    struct i40iw_cm_listener,
4209                                    child_listen_list);
4210                 if (!memcmp(child_listen_node->loc_addr, ipaddr, ipv4 ? 4 : 16))
4211                         goto set_qhash;
4212         }
4213
4214         /* if not found then add a child listener if interface is going up */
4215         if (!ifup)
4216                 return;
4217         child_listen_node = kzalloc(sizeof(*child_listen_node), GFP_ATOMIC);
4218         if (!child_listen_node)
4219                 return;
4220         node_allocated = true;
4221         memcpy(child_listen_node, parent_listen_node, sizeof(*child_listen_node));
4222
4223         memcpy(child_listen_node->loc_addr, ipaddr,  ipv4 ? 4 : 16);
4224
4225 set_qhash:
4226         memcpy(nfo->loc_addr,
4227                child_listen_node->loc_addr,
4228                sizeof(nfo->loc_addr));
4229         nfo->vlan_id = child_listen_node->vlan_id;
4230         ret = i40iw_manage_qhash(iwdev, nfo,
4231                                  I40IW_QHASH_TYPE_TCP_SYN,
4232                                  op,
4233                                  NULL, false);
4234         if (!ret) {
4235                 child_listen_node->qhash_set = ifup;
4236                 if (node_allocated)
4237                         list_add(&child_listen_node->child_listen_list,
4238                                  &parent_listen_node->child_listen_list);
4239         } else if (node_allocated) {
4240                 kfree(child_listen_node);
4241         }
4242 }
4243
4244 /**
4245  * i40iw_cm_disconnect_all - disconnect all connected qp's
4246  * @iwdev: device pointer
4247  */
4248 void i40iw_cm_disconnect_all(struct i40iw_device *iwdev)
4249 {
4250         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
4251         struct list_head *list_core_temp;
4252         struct list_head *list_node;
4253         struct i40iw_cm_node *cm_node;
4254         unsigned long flags;
4255         struct list_head connected_list;
4256         struct ib_qp_attr attr;
4257
4258         INIT_LIST_HEAD(&connected_list);
4259         spin_lock_irqsave(&cm_core->ht_lock, flags);
4260         list_for_each_safe(list_node, list_core_temp, &cm_core->connected_nodes) {
4261                 cm_node = container_of(list_node, struct i40iw_cm_node, list);
4262                 atomic_inc(&cm_node->ref_count);
4263                 list_add(&cm_node->connected_entry, &connected_list);
4264         }
4265         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
4266
4267         list_for_each_safe(list_node, list_core_temp, &connected_list) {
4268                 cm_node = container_of(list_node, struct i40iw_cm_node, connected_entry);
4269                 attr.qp_state = IB_QPS_ERR;
4270                 i40iw_modify_qp(&cm_node->iwqp->ibqp, &attr, IB_QP_STATE, NULL);
4271                 if (iwdev->reset)
4272                         i40iw_cm_disconn(cm_node->iwqp);
4273                 i40iw_rem_ref_cm_node(cm_node);
4274         }
4275 }
4276
4277 /**
4278  * i40iw_ifdown_notify - process an ifdown on an interface
4279  * @iwdev: device pointer
4280  * @ipaddr: Pointer to IPv4 or IPv6 address
4281  * @ipv4: flag indicating IPv4 when true
4282  * @ifup: flag indicating interface up when true
4283  */
4284 void i40iw_if_notify(struct i40iw_device *iwdev, struct net_device *netdev,
4285                      u32 *ipaddr, bool ipv4, bool ifup)
4286 {
4287         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
4288         unsigned long flags;
4289         struct i40iw_cm_listener *listen_node;
4290         static const u32 ip_zero[4] = { 0, 0, 0, 0 };
4291         struct i40iw_cm_info nfo;
4292         u16 vlan_id = rdma_vlan_dev_vlan_id(netdev);
4293         enum i40iw_status_code ret;
4294         enum i40iw_quad_hash_manage_type op =
4295                 ifup ? I40IW_QHASH_MANAGE_TYPE_ADD : I40IW_QHASH_MANAGE_TYPE_DELETE;
4296
4297         /* Disable or enable qhash for listeners */
4298         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
4299         list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
4300                 if (vlan_id == listen_node->vlan_id &&
4301                     (!memcmp(listen_node->loc_addr, ipaddr, ipv4 ? 4 : 16) ||
4302                     !memcmp(listen_node->loc_addr, ip_zero, ipv4 ? 4 : 16))) {
4303                         memcpy(nfo.loc_addr, listen_node->loc_addr,
4304                                sizeof(nfo.loc_addr));
4305                         nfo.loc_port = listen_node->loc_port;
4306                         nfo.ipv4 = listen_node->ipv4;
4307                         nfo.vlan_id = listen_node->vlan_id;
4308                         nfo.user_pri = listen_node->user_pri;
4309                         if (!list_empty(&listen_node->child_listen_list)) {
4310                                 i40iw_qhash_ctrl(iwdev,
4311                                                  listen_node,
4312                                                  &nfo,
4313                                                  ipaddr, ipv4, ifup);
4314                         } else if (memcmp(listen_node->loc_addr, ip_zero,
4315                                           ipv4 ? 4 : 16)) {
4316                                 ret = i40iw_manage_qhash(iwdev,
4317                                                          &nfo,
4318                                                          I40IW_QHASH_TYPE_TCP_SYN,
4319                                                          op,
4320                                                          NULL,
4321                                                          false);
4322                                 if (!ret)
4323                                         listen_node->qhash_set = ifup;
4324                         }
4325                 }
4326         }
4327         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
4328
4329         /* disconnect any connected qp's on ifdown */
4330         if (!ifup)
4331                 i40iw_cm_disconnect_all(iwdev);
4332 }