700a5d06b60cab92052001035582440c3a4ff5c4
[sfrench/cifs-2.6.git] / 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/secure_seq.h>
61 #include <net/tcp.h>
62 #include <asm/checksum.h>
63
64 #include "i40iw.h"
65
66 static void i40iw_rem_ref_cm_node(struct i40iw_cm_node *);
67 static void i40iw_cm_post_event(struct i40iw_cm_event *event);
68 static void i40iw_disconnect_worker(struct work_struct *work);
69
70 /**
71  * i40iw_free_sqbuf - put back puda buffer if refcount = 0
72  * @vsi: pointer to vsi structure
73  * @buf: puda buffer to free
74  */
75 void i40iw_free_sqbuf(struct i40iw_sc_vsi *vsi, void *bufp)
76 {
77         struct i40iw_puda_buf *buf = (struct i40iw_puda_buf *)bufp;
78         struct i40iw_puda_rsrc *ilq = vsi->ilq;
79
80         if (!atomic_dec_return(&buf->refcount))
81                 i40iw_puda_ret_bufpool(ilq, buf);
82 }
83
84 /**
85  * i40iw_derive_hw_ird_setting - Calculate IRD
86  *
87  * @cm_ird: IRD of connection's node
88  *
89  * The ird from the connection is rounded to a supported HW
90  * setting (2,8,32,64) and then encoded for ird_size field of
91  * qp_ctx
92  */
93 static u8 i40iw_derive_hw_ird_setting(u16 cm_ird)
94 {
95         u8 encoded_ird_size;
96
97         /* ird_size field is encoded in qp_ctx */
98         switch (cm_ird ? roundup_pow_of_two(cm_ird) : 0) {
99         case I40IW_HW_IRD_SETTING_64:
100                 encoded_ird_size = 3;
101                 break;
102         case I40IW_HW_IRD_SETTING_32:
103         case I40IW_HW_IRD_SETTING_16:
104                 encoded_ird_size = 2;
105                 break;
106         case I40IW_HW_IRD_SETTING_8:
107         case I40IW_HW_IRD_SETTING_4:
108                 encoded_ird_size = 1;
109                 break;
110         case I40IW_HW_IRD_SETTING_2:
111         default:
112                 encoded_ird_size = 0;
113                 break;
114         }
115         return encoded_ird_size;
116 }
117
118 /**
119  * i40iw_record_ird_ord - Record IRD/ORD passed in
120  * @cm_node: connection's node
121  * @conn_ird: connection IRD
122  * @conn_ord: connection ORD
123  */
124 static void i40iw_record_ird_ord(struct i40iw_cm_node *cm_node, u32 conn_ird,
125                                  u32 conn_ord)
126 {
127         if (conn_ird > I40IW_MAX_IRD_SIZE)
128                 conn_ird = I40IW_MAX_IRD_SIZE;
129
130         if (conn_ord > I40IW_MAX_ORD_SIZE)
131                 conn_ord = I40IW_MAX_ORD_SIZE;
132         else if (!conn_ord && cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO)
133                 conn_ord = 1;
134
135         cm_node->ird_size = conn_ird;
136         cm_node->ord_size = conn_ord;
137 }
138
139 /**
140  * i40iw_copy_ip_ntohl - change network to host ip
141  * @dst: host ip
142  * @src: big endian
143  */
144 void i40iw_copy_ip_ntohl(u32 *dst, __be32 *src)
145 {
146         *dst++ = ntohl(*src++);
147         *dst++ = ntohl(*src++);
148         *dst++ = ntohl(*src++);
149         *dst = ntohl(*src);
150 }
151
152 /**
153  * i40iw_copy_ip_htonl - change host addr to network ip
154  * @dst: host ip
155  * @src: little endian
156  */
157 static inline void i40iw_copy_ip_htonl(__be32 *dst, u32 *src)
158 {
159         *dst++ = htonl(*src++);
160         *dst++ = htonl(*src++);
161         *dst++ = htonl(*src++);
162         *dst = htonl(*src);
163 }
164
165 /**
166  * i40iw_fill_sockaddr4 - get addr info for passive connection
167  * @cm_node: connection's node
168  * @event: upper layer's cm event
169  */
170 static inline void i40iw_fill_sockaddr4(struct i40iw_cm_node *cm_node,
171                                         struct iw_cm_event *event)
172 {
173         struct sockaddr_in *laddr = (struct sockaddr_in *)&event->local_addr;
174         struct sockaddr_in *raddr = (struct sockaddr_in *)&event->remote_addr;
175
176         laddr->sin_family = AF_INET;
177         raddr->sin_family = AF_INET;
178
179         laddr->sin_port = htons(cm_node->loc_port);
180         raddr->sin_port = htons(cm_node->rem_port);
181
182         laddr->sin_addr.s_addr = htonl(cm_node->loc_addr[0]);
183         raddr->sin_addr.s_addr = htonl(cm_node->rem_addr[0]);
184 }
185
186 /**
187  * i40iw_fill_sockaddr6 - get ipv6 addr info for passive side
188  * @cm_node: connection's node
189  * @event: upper layer's cm event
190  */
191 static inline void i40iw_fill_sockaddr6(struct i40iw_cm_node *cm_node,
192                                         struct iw_cm_event *event)
193 {
194         struct sockaddr_in6 *laddr6 = (struct sockaddr_in6 *)&event->local_addr;
195         struct sockaddr_in6 *raddr6 = (struct sockaddr_in6 *)&event->remote_addr;
196
197         laddr6->sin6_family = AF_INET6;
198         raddr6->sin6_family = AF_INET6;
199
200         laddr6->sin6_port = htons(cm_node->loc_port);
201         raddr6->sin6_port = htons(cm_node->rem_port);
202
203         i40iw_copy_ip_htonl(laddr6->sin6_addr.in6_u.u6_addr32,
204                             cm_node->loc_addr);
205         i40iw_copy_ip_htonl(raddr6->sin6_addr.in6_u.u6_addr32,
206                             cm_node->rem_addr);
207 }
208
209 /**
210  * i40iw_get_addr_info
211  * @cm_node: contains ip/tcp info
212  * @cm_info: to get a copy of the cm_node ip/tcp info
213 */
214 static void i40iw_get_addr_info(struct i40iw_cm_node *cm_node,
215                                 struct i40iw_cm_info *cm_info)
216 {
217         cm_info->ipv4 = cm_node->ipv4;
218         cm_info->vlan_id = cm_node->vlan_id;
219         memcpy(cm_info->loc_addr, cm_node->loc_addr, sizeof(cm_info->loc_addr));
220         memcpy(cm_info->rem_addr, cm_node->rem_addr, sizeof(cm_info->rem_addr));
221         cm_info->loc_port = cm_node->loc_port;
222         cm_info->rem_port = cm_node->rem_port;
223         cm_info->user_pri = cm_node->user_pri;
224 }
225
226 /**
227  * i40iw_get_cmevent_info - for cm event upcall
228  * @cm_node: connection's node
229  * @cm_id: upper layers cm struct for the event
230  * @event: upper layer's cm event
231  */
232 static inline void i40iw_get_cmevent_info(struct i40iw_cm_node *cm_node,
233                                           struct iw_cm_id *cm_id,
234                                           struct iw_cm_event *event)
235 {
236         memcpy(&event->local_addr, &cm_id->m_local_addr,
237                sizeof(event->local_addr));
238         memcpy(&event->remote_addr, &cm_id->m_remote_addr,
239                sizeof(event->remote_addr));
240         if (cm_node) {
241                 event->private_data = (void *)cm_node->pdata_buf;
242                 event->private_data_len = (u8)cm_node->pdata.size;
243                 event->ird = cm_node->ird_size;
244                 event->ord = cm_node->ord_size;
245         }
246 }
247
248 /**
249  * i40iw_send_cm_event - upcall cm's event handler
250  * @cm_node: connection's node
251  * @cm_id: upper layer's cm info struct
252  * @type: Event type to indicate
253  * @status: status for the event type
254  */
255 static int i40iw_send_cm_event(struct i40iw_cm_node *cm_node,
256                                struct iw_cm_id *cm_id,
257                                enum iw_cm_event_type type,
258                                int status)
259 {
260         struct iw_cm_event event;
261
262         memset(&event, 0, sizeof(event));
263         event.event = type;
264         event.status = status;
265         switch (type) {
266         case IW_CM_EVENT_CONNECT_REQUEST:
267                 if (cm_node->ipv4)
268                         i40iw_fill_sockaddr4(cm_node, &event);
269                 else
270                         i40iw_fill_sockaddr6(cm_node, &event);
271                 event.provider_data = (void *)cm_node;
272                 event.private_data = (void *)cm_node->pdata_buf;
273                 event.private_data_len = (u8)cm_node->pdata.size;
274                 event.ird = cm_node->ird_size;
275                 break;
276         case IW_CM_EVENT_CONNECT_REPLY:
277                 i40iw_get_cmevent_info(cm_node, cm_id, &event);
278                 break;
279         case IW_CM_EVENT_ESTABLISHED:
280                 event.ird = cm_node->ird_size;
281                 event.ord = cm_node->ord_size;
282                 break;
283         case IW_CM_EVENT_DISCONNECT:
284                 break;
285         case IW_CM_EVENT_CLOSE:
286                 break;
287         default:
288                 i40iw_pr_err("event type received type = %d\n", type);
289                 return -1;
290         }
291         return cm_id->event_handler(cm_id, &event);
292 }
293
294 /**
295  * i40iw_create_event - create cm event
296  * @cm_node: connection's node
297  * @type: Event type to generate
298  */
299 static struct i40iw_cm_event *i40iw_create_event(struct i40iw_cm_node *cm_node,
300                                                  enum i40iw_cm_event_type type)
301 {
302         struct i40iw_cm_event *event;
303
304         if (!cm_node->cm_id)
305                 return NULL;
306
307         event = kzalloc(sizeof(*event), GFP_ATOMIC);
308
309         if (!event)
310                 return NULL;
311
312         event->type = type;
313         event->cm_node = cm_node;
314         memcpy(event->cm_info.rem_addr, cm_node->rem_addr, sizeof(event->cm_info.rem_addr));
315         memcpy(event->cm_info.loc_addr, cm_node->loc_addr, sizeof(event->cm_info.loc_addr));
316         event->cm_info.rem_port = cm_node->rem_port;
317         event->cm_info.loc_port = cm_node->loc_port;
318         event->cm_info.cm_id = cm_node->cm_id;
319
320         i40iw_debug(cm_node->dev,
321                     I40IW_DEBUG_CM,
322                     "node=%p event=%p type=%u dst=%pI4 src=%pI4\n",
323                     cm_node,
324                     event,
325                     type,
326                     event->cm_info.loc_addr,
327                     event->cm_info.rem_addr);
328
329         i40iw_cm_post_event(event);
330         return event;
331 }
332
333 /**
334  * i40iw_free_retrans_entry - free send entry
335  * @cm_node: connection's node
336  */
337 static void i40iw_free_retrans_entry(struct i40iw_cm_node *cm_node)
338 {
339         struct i40iw_device *iwdev = cm_node->iwdev;
340         struct i40iw_timer_entry *send_entry;
341
342         send_entry = cm_node->send_entry;
343         if (send_entry) {
344                 cm_node->send_entry = NULL;
345                 i40iw_free_sqbuf(&iwdev->vsi, (void *)send_entry->sqbuf);
346                 kfree(send_entry);
347                 atomic_dec(&cm_node->ref_count);
348         }
349 }
350
351 /**
352  * i40iw_cleanup_retrans_entry - free send entry with lock
353  * @cm_node: connection's node
354  */
355 static void i40iw_cleanup_retrans_entry(struct i40iw_cm_node *cm_node)
356 {
357         unsigned long flags;
358
359         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
360         i40iw_free_retrans_entry(cm_node);
361         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
362 }
363
364 /**
365  * i40iw_form_cm_frame - get a free packet and build frame
366  * @cm_node: connection's node ionfo to use in frame
367  * @options: pointer to options info
368  * @hdr: pointer mpa header
369  * @pdata: pointer to private data
370  * @flags:  indicates FIN or ACK
371  */
372 static struct i40iw_puda_buf *i40iw_form_cm_frame(struct i40iw_cm_node *cm_node,
373                                                   struct i40iw_kmem_info *options,
374                                                   struct i40iw_kmem_info *hdr,
375                                                   struct i40iw_kmem_info *pdata,
376                                                   u8 flags)
377 {
378         struct i40iw_puda_buf *sqbuf;
379         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
380         u8 *buf;
381
382         struct tcphdr *tcph;
383         struct iphdr *iph;
384         struct ipv6hdr *ip6h;
385         struct ethhdr *ethh;
386         u16 packetsize;
387         u16 eth_hlen = ETH_HLEN;
388         u32 opts_len = 0;
389         u32 pd_len = 0;
390         u32 hdr_len = 0;
391         u16 vtag;
392
393         sqbuf = i40iw_puda_get_bufpool(vsi->ilq);
394         if (!sqbuf)
395                 return NULL;
396         buf = sqbuf->mem.va;
397
398         if (options)
399                 opts_len = (u32)options->size;
400
401         if (hdr)
402                 hdr_len = hdr->size;
403
404         if (pdata)
405                 pd_len = pdata->size;
406
407         if (cm_node->vlan_id <= VLAN_VID_MASK)
408                 eth_hlen += 4;
409
410         if (cm_node->ipv4)
411                 packetsize = sizeof(*iph) + sizeof(*tcph);
412         else
413                 packetsize = sizeof(*ip6h) + sizeof(*tcph);
414         packetsize += opts_len + hdr_len + pd_len;
415
416         memset(buf, 0x00, eth_hlen + packetsize);
417
418         sqbuf->totallen = packetsize + eth_hlen;
419         sqbuf->maclen = eth_hlen;
420         sqbuf->tcphlen = sizeof(*tcph) + opts_len;
421         sqbuf->scratch = (void *)cm_node;
422
423         ethh = (struct ethhdr *)buf;
424         buf += eth_hlen;
425
426         if (cm_node->ipv4) {
427                 sqbuf->ipv4 = true;
428
429                 iph = (struct iphdr *)buf;
430                 buf += sizeof(*iph);
431                 tcph = (struct tcphdr *)buf;
432                 buf += sizeof(*tcph);
433
434                 ether_addr_copy(ethh->h_dest, cm_node->rem_mac);
435                 ether_addr_copy(ethh->h_source, cm_node->loc_mac);
436                 if (cm_node->vlan_id <= VLAN_VID_MASK) {
437                         ((struct vlan_ethhdr *)ethh)->h_vlan_proto = htons(ETH_P_8021Q);
438                         vtag = (cm_node->user_pri << VLAN_PRIO_SHIFT) | cm_node->vlan_id;
439                         ((struct vlan_ethhdr *)ethh)->h_vlan_TCI = htons(vtag);
440
441                         ((struct vlan_ethhdr *)ethh)->h_vlan_encapsulated_proto = htons(ETH_P_IP);
442                 } else {
443                         ethh->h_proto = htons(ETH_P_IP);
444                 }
445
446                 iph->version = IPVERSION;
447                 iph->ihl = 5;   /* 5 * 4Byte words, IP headr len */
448                 iph->tos = cm_node->tos;
449                 iph->tot_len = htons(packetsize);
450                 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
451
452                 iph->frag_off = htons(0x4000);
453                 iph->ttl = 0x40;
454                 iph->protocol = IPPROTO_TCP;
455                 iph->saddr = htonl(cm_node->loc_addr[0]);
456                 iph->daddr = htonl(cm_node->rem_addr[0]);
457         } else {
458                 sqbuf->ipv4 = false;
459                 ip6h = (struct ipv6hdr *)buf;
460                 buf += sizeof(*ip6h);
461                 tcph = (struct tcphdr *)buf;
462                 buf += sizeof(*tcph);
463
464                 ether_addr_copy(ethh->h_dest, cm_node->rem_mac);
465                 ether_addr_copy(ethh->h_source, cm_node->loc_mac);
466                 if (cm_node->vlan_id <= VLAN_VID_MASK) {
467                         ((struct vlan_ethhdr *)ethh)->h_vlan_proto = htons(ETH_P_8021Q);
468                         vtag = (cm_node->user_pri << VLAN_PRIO_SHIFT) | cm_node->vlan_id;
469                         ((struct vlan_ethhdr *)ethh)->h_vlan_TCI = htons(vtag);
470                         ((struct vlan_ethhdr *)ethh)->h_vlan_encapsulated_proto = htons(ETH_P_IPV6);
471                 } else {
472                         ethh->h_proto = htons(ETH_P_IPV6);
473                 }
474                 ip6h->version = 6;
475                 ip6h->priority = cm_node->tos >> 4;
476                 ip6h->flow_lbl[0] = cm_node->tos << 4;
477                 ip6h->flow_lbl[1] = 0;
478                 ip6h->flow_lbl[2] = 0;
479                 ip6h->payload_len = htons(packetsize - sizeof(*ip6h));
480                 ip6h->nexthdr = 6;
481                 ip6h->hop_limit = 128;
482                 i40iw_copy_ip_htonl(ip6h->saddr.in6_u.u6_addr32,
483                                     cm_node->loc_addr);
484                 i40iw_copy_ip_htonl(ip6h->daddr.in6_u.u6_addr32,
485                                     cm_node->rem_addr);
486         }
487
488         tcph->source = htons(cm_node->loc_port);
489         tcph->dest = htons(cm_node->rem_port);
490
491         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
492
493         if (flags & SET_ACK) {
494                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
495                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
496                 tcph->ack = 1;
497         } else {
498                 tcph->ack_seq = 0;
499         }
500
501         if (flags & SET_SYN) {
502                 cm_node->tcp_cntxt.loc_seq_num++;
503                 tcph->syn = 1;
504         } else {
505                 cm_node->tcp_cntxt.loc_seq_num += hdr_len + pd_len;
506         }
507
508         if (flags & SET_FIN) {
509                 cm_node->tcp_cntxt.loc_seq_num++;
510                 tcph->fin = 1;
511         }
512
513         if (flags & SET_RST)
514                 tcph->rst = 1;
515
516         tcph->doff = (u16)((sizeof(*tcph) + opts_len + 3) >> 2);
517         sqbuf->tcphlen = tcph->doff << 2;
518         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
519         tcph->urg_ptr = 0;
520
521         if (opts_len) {
522                 memcpy(buf, options->addr, opts_len);
523                 buf += opts_len;
524         }
525
526         if (hdr_len) {
527                 memcpy(buf, hdr->addr, hdr_len);
528                 buf += hdr_len;
529         }
530
531         if (pdata && pdata->addr)
532                 memcpy(buf, pdata->addr, pdata->size);
533
534         atomic_set(&sqbuf->refcount, 1);
535
536         return sqbuf;
537 }
538
539 /**
540  * i40iw_send_reset - Send RST packet
541  * @cm_node: connection's node
542  */
543 int i40iw_send_reset(struct i40iw_cm_node *cm_node)
544 {
545         struct i40iw_puda_buf *sqbuf;
546         int flags = SET_RST | SET_ACK;
547
548         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, flags);
549         if (!sqbuf) {
550                 i40iw_pr_err("no sqbuf\n");
551                 return -1;
552         }
553
554         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 0, 1);
555 }
556
557 /**
558  * i40iw_active_open_err - send event for active side cm error
559  * @cm_node: connection's node
560  * @reset: Flag to send reset or not
561  */
562 static void i40iw_active_open_err(struct i40iw_cm_node *cm_node, bool reset)
563 {
564         i40iw_cleanup_retrans_entry(cm_node);
565         cm_node->cm_core->stats_connect_errs++;
566         if (reset) {
567                 i40iw_debug(cm_node->dev,
568                             I40IW_DEBUG_CM,
569                             "%s cm_node=%p state=%d\n",
570                             __func__,
571                             cm_node,
572                             cm_node->state);
573                 atomic_inc(&cm_node->ref_count);
574                 i40iw_send_reset(cm_node);
575         }
576
577         cm_node->state = I40IW_CM_STATE_CLOSED;
578         i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
579 }
580
581 /**
582  * i40iw_passive_open_err - handle passive side cm error
583  * @cm_node: connection's node
584  * @reset: send reset or just free cm_node
585  */
586 static void i40iw_passive_open_err(struct i40iw_cm_node *cm_node, bool reset)
587 {
588         i40iw_cleanup_retrans_entry(cm_node);
589         cm_node->cm_core->stats_passive_errs++;
590         cm_node->state = I40IW_CM_STATE_CLOSED;
591         i40iw_debug(cm_node->dev,
592                     I40IW_DEBUG_CM,
593                     "%s cm_node=%p state =%d\n",
594                     __func__,
595                     cm_node,
596                     cm_node->state);
597         if (reset)
598                 i40iw_send_reset(cm_node);
599         else
600                 i40iw_rem_ref_cm_node(cm_node);
601 }
602
603 /**
604  * i40iw_event_connect_error - to create connect error event
605  * @event: cm information for connect event
606  */
607 static void i40iw_event_connect_error(struct i40iw_cm_event *event)
608 {
609         struct i40iw_qp *iwqp;
610         struct iw_cm_id *cm_id;
611
612         cm_id = event->cm_node->cm_id;
613         if (!cm_id)
614                 return;
615
616         iwqp = cm_id->provider_data;
617
618         if (!iwqp || !iwqp->iwdev)
619                 return;
620
621         iwqp->cm_id = NULL;
622         cm_id->provider_data = NULL;
623         i40iw_send_cm_event(event->cm_node, cm_id,
624                             IW_CM_EVENT_CONNECT_REPLY,
625                             -ECONNRESET);
626         cm_id->rem_ref(cm_id);
627         i40iw_rem_ref_cm_node(event->cm_node);
628 }
629
630 /**
631  * i40iw_process_options
632  * @cm_node: connection's node
633  * @optionsloc: point to start of options
634  * @optionsize: size of all options
635  * @syn_packet: flag if syn packet
636  */
637 static int i40iw_process_options(struct i40iw_cm_node *cm_node,
638                                  u8 *optionsloc,
639                                  u32 optionsize,
640                                  u32 syn_packet)
641 {
642         u32 tmp;
643         u32 offset = 0;
644         union all_known_options *all_options;
645         char got_mss_option = 0;
646
647         while (offset < optionsize) {
648                 all_options = (union all_known_options *)(optionsloc + offset);
649                 switch (all_options->as_base.optionnum) {
650                 case OPTION_NUMBER_END:
651                         offset = optionsize;
652                         break;
653                 case OPTION_NUMBER_NONE:
654                         offset += 1;
655                         continue;
656                 case OPTION_NUMBER_MSS:
657                         i40iw_debug(cm_node->dev,
658                                     I40IW_DEBUG_CM,
659                                     "%s: MSS Length: %d Offset: %d Size: %d\n",
660                                     __func__,
661                                     all_options->as_mss.length,
662                                     offset,
663                                     optionsize);
664                         got_mss_option = 1;
665                         if (all_options->as_mss.length != 4)
666                                 return -1;
667                         tmp = ntohs(all_options->as_mss.mss);
668                         if (tmp > 0 && tmp < cm_node->tcp_cntxt.mss)
669                                 cm_node->tcp_cntxt.mss = tmp;
670                         break;
671                 case OPTION_NUMBER_WINDOW_SCALE:
672                         cm_node->tcp_cntxt.snd_wscale =
673                             all_options->as_windowscale.shiftcount;
674                         break;
675                 default:
676                         i40iw_debug(cm_node->dev,
677                                     I40IW_DEBUG_CM,
678                                     "TCP Option not understood: %x\n",
679                                     all_options->as_base.optionnum);
680                         break;
681                 }
682                 offset += all_options->as_base.length;
683         }
684         if (!got_mss_option && syn_packet)
685                 cm_node->tcp_cntxt.mss = I40IW_CM_DEFAULT_MSS;
686         return 0;
687 }
688
689 /**
690  * i40iw_handle_tcp_options -
691  * @cm_node: connection's node
692  * @tcph: pointer tcp header
693  * @optionsize: size of options rcvd
694  * @passive: active or passive flag
695  */
696 static int i40iw_handle_tcp_options(struct i40iw_cm_node *cm_node,
697                                     struct tcphdr *tcph,
698                                     int optionsize,
699                                     int passive)
700 {
701         u8 *optionsloc = (u8 *)&tcph[1];
702
703         if (optionsize) {
704                 if (i40iw_process_options(cm_node,
705                                           optionsloc,
706                                           optionsize,
707                                           (u32)tcph->syn)) {
708                         i40iw_debug(cm_node->dev,
709                                     I40IW_DEBUG_CM,
710                                     "%s: Node %p, Sending RESET\n",
711                                     __func__,
712                                     cm_node);
713                         if (passive)
714                                 i40iw_passive_open_err(cm_node, true);
715                         else
716                                 i40iw_active_open_err(cm_node, true);
717                         return -1;
718                 }
719         }
720
721         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
722             cm_node->tcp_cntxt.snd_wscale;
723
724         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
725                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
726         return 0;
727 }
728
729 /**
730  * i40iw_build_mpa_v1 - build a MPA V1 frame
731  * @cm_node: connection's node
732  * @mpa_key: to do read0 or write0
733  */
734 static void i40iw_build_mpa_v1(struct i40iw_cm_node *cm_node,
735                                void *start_addr,
736                                u8 mpa_key)
737 {
738         struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
739
740         switch (mpa_key) {
741         case MPA_KEY_REQUEST:
742                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
743                 break;
744         case MPA_KEY_REPLY:
745                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
746                 break;
747         default:
748                 break;
749         }
750         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
751         mpa_frame->rev = cm_node->mpa_frame_rev;
752         mpa_frame->priv_data_len = htons(cm_node->pdata.size);
753 }
754
755 /**
756  * i40iw_build_mpa_v2 - build a MPA V2 frame
757  * @cm_node: connection's node
758  * @start_addr: buffer start address
759  * @mpa_key: to do read0 or write0
760  */
761 static void i40iw_build_mpa_v2(struct i40iw_cm_node *cm_node,
762                                void *start_addr,
763                                u8 mpa_key)
764 {
765         struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
766         struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
767         u16 ctrl_ird, ctrl_ord;
768
769         /* initialize the upper 5 bytes of the frame */
770         i40iw_build_mpa_v1(cm_node, start_addr, mpa_key);
771         mpa_frame->flags |= IETF_MPA_V2_FLAG;
772         mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
773
774         /* initialize RTR msg */
775         if (cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
776                 ctrl_ird = IETF_NO_IRD_ORD;
777                 ctrl_ord = IETF_NO_IRD_ORD;
778         } else {
779                 ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
780                         IETF_NO_IRD_ORD : cm_node->ird_size;
781                 ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
782                         IETF_NO_IRD_ORD : cm_node->ord_size;
783         }
784
785         ctrl_ird |= IETF_PEER_TO_PEER;
786
787         switch (mpa_key) {
788         case MPA_KEY_REQUEST:
789                 ctrl_ord |= IETF_RDMA0_WRITE;
790                 ctrl_ord |= IETF_RDMA0_READ;
791                 break;
792         case MPA_KEY_REPLY:
793                 switch (cm_node->send_rdma0_op) {
794                 case SEND_RDMA_WRITE_ZERO:
795                         ctrl_ord |= IETF_RDMA0_WRITE;
796                         break;
797                 case SEND_RDMA_READ_ZERO:
798                         ctrl_ord |= IETF_RDMA0_READ;
799                         break;
800                 }
801                 break;
802         default:
803                 break;
804         }
805         rtr_msg->ctrl_ird = htons(ctrl_ird);
806         rtr_msg->ctrl_ord = htons(ctrl_ord);
807 }
808
809 /**
810  * i40iw_cm_build_mpa_frame - build mpa frame for mpa version 1 or version 2
811  * @cm_node: connection's node
812  * @mpa: mpa: data buffer
813  * @mpa_key: to do read0 or write0
814  */
815 static int i40iw_cm_build_mpa_frame(struct i40iw_cm_node *cm_node,
816                                     struct i40iw_kmem_info *mpa,
817                                     u8 mpa_key)
818 {
819         int hdr_len = 0;
820
821         switch (cm_node->mpa_frame_rev) {
822         case IETF_MPA_V1:
823                 hdr_len = sizeof(struct ietf_mpa_v1);
824                 i40iw_build_mpa_v1(cm_node, mpa->addr, mpa_key);
825                 break;
826         case IETF_MPA_V2:
827                 hdr_len = sizeof(struct ietf_mpa_v2);
828                 i40iw_build_mpa_v2(cm_node, mpa->addr, mpa_key);
829                 break;
830         default:
831                 break;
832         }
833
834         return hdr_len;
835 }
836
837 /**
838  * i40iw_send_mpa_request - active node send mpa request to passive node
839  * @cm_node: connection's node
840  */
841 static int i40iw_send_mpa_request(struct i40iw_cm_node *cm_node)
842 {
843         struct i40iw_puda_buf *sqbuf;
844
845         if (!cm_node) {
846                 i40iw_pr_err("cm_node == NULL\n");
847                 return -1;
848         }
849
850         cm_node->mpa_hdr.addr = &cm_node->mpa_frame;
851         cm_node->mpa_hdr.size = i40iw_cm_build_mpa_frame(cm_node,
852                                                          &cm_node->mpa_hdr,
853                                                          MPA_KEY_REQUEST);
854         if (!cm_node->mpa_hdr.size) {
855                 i40iw_pr_err("mpa size = %d\n", cm_node->mpa_hdr.size);
856                 return -1;
857         }
858
859         sqbuf = i40iw_form_cm_frame(cm_node,
860                                     NULL,
861                                     &cm_node->mpa_hdr,
862                                     &cm_node->pdata,
863                                     SET_ACK);
864         if (!sqbuf) {
865                 i40iw_pr_err("sq_buf == NULL\n");
866                 return -1;
867         }
868         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
869 }
870
871 /**
872  * i40iw_send_mpa_reject -
873  * @cm_node: connection's node
874  * @pdata: reject data for connection
875  * @plen: length of reject data
876  */
877 static int i40iw_send_mpa_reject(struct i40iw_cm_node *cm_node,
878                                  const void *pdata,
879                                  u8 plen)
880 {
881         struct i40iw_puda_buf *sqbuf;
882         struct i40iw_kmem_info priv_info;
883
884         cm_node->mpa_hdr.addr = &cm_node->mpa_frame;
885         cm_node->mpa_hdr.size = i40iw_cm_build_mpa_frame(cm_node,
886                                                          &cm_node->mpa_hdr,
887                                                          MPA_KEY_REPLY);
888
889         cm_node->mpa_frame.flags |= IETF_MPA_FLAGS_REJECT;
890         priv_info.addr = (void *)pdata;
891         priv_info.size = plen;
892
893         sqbuf = i40iw_form_cm_frame(cm_node,
894                                     NULL,
895                                     &cm_node->mpa_hdr,
896                                     &priv_info,
897                                     SET_ACK | SET_FIN);
898         if (!sqbuf) {
899                 i40iw_pr_err("no sqbuf\n");
900                 return -ENOMEM;
901         }
902         cm_node->state = I40IW_CM_STATE_FIN_WAIT1;
903         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
904 }
905
906 /**
907  * recv_mpa - process an IETF MPA frame
908  * @cm_node: connection's node
909  * @buffer: Data pointer
910  * @type: to return accept or reject
911  * @len: Len of mpa buffer
912  */
913 static int i40iw_parse_mpa(struct i40iw_cm_node *cm_node, u8 *buffer, u32 *type, u32 len)
914 {
915         struct ietf_mpa_v1 *mpa_frame;
916         struct ietf_mpa_v2 *mpa_v2_frame;
917         struct ietf_rtr_msg *rtr_msg;
918         int mpa_hdr_len;
919         int priv_data_len;
920
921         *type = I40IW_MPA_REQUEST_ACCEPT;
922
923         if (len < sizeof(struct ietf_mpa_v1)) {
924                 i40iw_pr_err("ietf buffer small (%x)\n", len);
925                 return -1;
926         }
927
928         mpa_frame = (struct ietf_mpa_v1 *)buffer;
929         mpa_hdr_len = sizeof(struct ietf_mpa_v1);
930         priv_data_len = ntohs(mpa_frame->priv_data_len);
931
932         if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
933                 i40iw_pr_err("large pri_data %d\n", priv_data_len);
934                 return -1;
935         }
936         if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
937                 i40iw_pr_err("unsupported mpa rev = %d\n", mpa_frame->rev);
938                 return -1;
939         }
940         if (mpa_frame->rev > cm_node->mpa_frame_rev) {
941                 i40iw_pr_err("rev %d\n", mpa_frame->rev);
942                 return -1;
943         }
944         cm_node->mpa_frame_rev = mpa_frame->rev;
945
946         if (cm_node->state != I40IW_CM_STATE_MPAREQ_SENT) {
947                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
948                         i40iw_pr_err("Unexpected MPA Key received\n");
949                         return -1;
950                 }
951         } else {
952                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
953                         i40iw_pr_err("Unexpected MPA Key received\n");
954                         return -1;
955                 }
956         }
957
958         if (priv_data_len + mpa_hdr_len > len) {
959                 i40iw_pr_err("ietf buffer len(%x + %x != %x)\n",
960                              priv_data_len, mpa_hdr_len, len);
961                 return -1;
962         }
963         if (len > MAX_CM_BUFFER) {
964                 i40iw_pr_err("ietf buffer large len = %d\n", len);
965                 return -1;
966         }
967
968         switch (mpa_frame->rev) {
969         case IETF_MPA_V2:{
970                         u16 ird_size;
971                         u16 ord_size;
972                         u16 ctrl_ord;
973                         u16 ctrl_ird;
974
975                         mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
976                         mpa_hdr_len += IETF_RTR_MSG_SIZE;
977                         rtr_msg = &mpa_v2_frame->rtr_msg;
978
979                         /* parse rtr message */
980                         ctrl_ord = ntohs(rtr_msg->ctrl_ord);
981                         ctrl_ird = ntohs(rtr_msg->ctrl_ird);
982                         ird_size = ctrl_ird & IETF_NO_IRD_ORD;
983                         ord_size = ctrl_ord & IETF_NO_IRD_ORD;
984
985                         if (!(ctrl_ird & IETF_PEER_TO_PEER))
986                                 return -1;
987
988                         if (ird_size == IETF_NO_IRD_ORD || ord_size == IETF_NO_IRD_ORD) {
989                                 cm_node->mpav2_ird_ord = IETF_NO_IRD_ORD;
990                                 goto negotiate_done;
991                         }
992
993                         if (cm_node->state != I40IW_CM_STATE_MPAREQ_SENT) {
994                                 /* responder */
995                                 if (!ord_size && (ctrl_ord & IETF_RDMA0_READ))
996                                         cm_node->ird_size = 1;
997                                 if (cm_node->ord_size > ird_size)
998                                         cm_node->ord_size = ird_size;
999                         } else {
1000                                 /* initiator */
1001                                 if (!ird_size && (ctrl_ord & IETF_RDMA0_READ))
1002                                         return -1;
1003                                 if (cm_node->ord_size > ird_size)
1004                                         cm_node->ord_size = ird_size;
1005
1006                                 if (cm_node->ird_size < ord_size)
1007                                         /* no resources available */
1008                                         return -1;
1009                         }
1010
1011 negotiate_done:
1012                         if (ctrl_ord & IETF_RDMA0_READ)
1013                                 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1014                         else if (ctrl_ord & IETF_RDMA0_WRITE)
1015                                 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
1016                         else    /* Not supported RDMA0 operation */
1017                                 return -1;
1018                         i40iw_debug(cm_node->dev, I40IW_DEBUG_CM,
1019                                     "MPAV2: Negotiated ORD: %d, IRD: %d\n",
1020                                     cm_node->ord_size, cm_node->ird_size);
1021                         break;
1022                 }
1023                 break;
1024         case IETF_MPA_V1:
1025         default:
1026                 break;
1027         }
1028
1029         memcpy(cm_node->pdata_buf, buffer + mpa_hdr_len, priv_data_len);
1030         cm_node->pdata.size = priv_data_len;
1031
1032         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
1033                 *type = I40IW_MPA_REQUEST_REJECT;
1034
1035         if (mpa_frame->flags & IETF_MPA_FLAGS_MARKERS)
1036                 cm_node->snd_mark_en = true;
1037
1038         return 0;
1039 }
1040
1041 /**
1042  * i40iw_schedule_cm_timer
1043  * @@cm_node: connection's node
1044  * @sqbuf: buffer to send
1045  * @type: if it is send or close
1046  * @send_retrans: if rexmits to be done
1047  * @close_when_complete: is cm_node to be removed
1048  *
1049  * note - cm_node needs to be protected before calling this. Encase in:
1050  *              i40iw_rem_ref_cm_node(cm_core, cm_node);
1051  *              i40iw_schedule_cm_timer(...)
1052  *              atomic_inc(&cm_node->ref_count);
1053  */
1054 int i40iw_schedule_cm_timer(struct i40iw_cm_node *cm_node,
1055                             struct i40iw_puda_buf *sqbuf,
1056                             enum i40iw_timer_type type,
1057                             int send_retrans,
1058                             int close_when_complete)
1059 {
1060         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
1061         struct i40iw_cm_core *cm_core = cm_node->cm_core;
1062         struct i40iw_timer_entry *new_send;
1063         int ret = 0;
1064         u32 was_timer_set;
1065         unsigned long flags;
1066
1067         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
1068         if (!new_send) {
1069                 if (type != I40IW_TIMER_TYPE_CLOSE)
1070                         i40iw_free_sqbuf(vsi, (void *)sqbuf);
1071                 return -ENOMEM;
1072         }
1073         new_send->retrycount = I40IW_DEFAULT_RETRYS;
1074         new_send->retranscount = I40IW_DEFAULT_RETRANS;
1075         new_send->sqbuf = sqbuf;
1076         new_send->timetosend = jiffies;
1077         new_send->type = type;
1078         new_send->send_retrans = send_retrans;
1079         new_send->close_when_complete = close_when_complete;
1080
1081         if (type == I40IW_TIMER_TYPE_CLOSE) {
1082                 new_send->timetosend += (HZ / 10);
1083                 if (cm_node->close_entry) {
1084                         kfree(new_send);
1085                         i40iw_pr_err("already close entry\n");
1086                         return -EINVAL;
1087                 }
1088                 cm_node->close_entry = new_send;
1089         }
1090
1091         if (type == I40IW_TIMER_TYPE_SEND) {
1092                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1093                 cm_node->send_entry = new_send;
1094                 atomic_inc(&cm_node->ref_count);
1095                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1096                 new_send->timetosend = jiffies + I40IW_RETRY_TIMEOUT;
1097
1098                 atomic_inc(&sqbuf->refcount);
1099                 i40iw_puda_send_buf(vsi->ilq, sqbuf);
1100                 if (!send_retrans) {
1101                         i40iw_cleanup_retrans_entry(cm_node);
1102                         if (close_when_complete)
1103                                 i40iw_rem_ref_cm_node(cm_node);
1104                         return ret;
1105                 }
1106         }
1107
1108         spin_lock_irqsave(&cm_core->ht_lock, flags);
1109         was_timer_set = timer_pending(&cm_core->tcp_timer);
1110
1111         if (!was_timer_set) {
1112                 cm_core->tcp_timer.expires = new_send->timetosend;
1113                 add_timer(&cm_core->tcp_timer);
1114         }
1115         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1116
1117         return ret;
1118 }
1119
1120 /**
1121  * i40iw_retrans_expired - Could not rexmit the packet
1122  * @cm_node: connection's node
1123  */
1124 static void i40iw_retrans_expired(struct i40iw_cm_node *cm_node)
1125 {
1126         struct iw_cm_id *cm_id = cm_node->cm_id;
1127         enum i40iw_cm_node_state state = cm_node->state;
1128
1129         cm_node->state = I40IW_CM_STATE_CLOSED;
1130         switch (state) {
1131         case I40IW_CM_STATE_SYN_RCVD:
1132         case I40IW_CM_STATE_CLOSING:
1133                 i40iw_rem_ref_cm_node(cm_node);
1134                 break;
1135         case I40IW_CM_STATE_FIN_WAIT1:
1136         case I40IW_CM_STATE_LAST_ACK:
1137                 if (cm_node->cm_id)
1138                         cm_id->rem_ref(cm_id);
1139                 i40iw_send_reset(cm_node);
1140                 break;
1141         default:
1142                 atomic_inc(&cm_node->ref_count);
1143                 i40iw_send_reset(cm_node);
1144                 i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
1145                 break;
1146         }
1147 }
1148
1149 /**
1150  * i40iw_handle_close_entry - for handling retry/timeouts
1151  * @cm_node: connection's node
1152  * @rem_node: flag for remove cm_node
1153  */
1154 static void i40iw_handle_close_entry(struct i40iw_cm_node *cm_node, u32 rem_node)
1155 {
1156         struct i40iw_timer_entry *close_entry = cm_node->close_entry;
1157         struct iw_cm_id *cm_id = cm_node->cm_id;
1158         struct i40iw_qp *iwqp;
1159         unsigned long flags;
1160
1161         if (!close_entry)
1162                 return;
1163         iwqp = (struct i40iw_qp *)close_entry->sqbuf;
1164         if (iwqp) {
1165                 spin_lock_irqsave(&iwqp->lock, flags);
1166                 if (iwqp->cm_id) {
1167                         iwqp->hw_tcp_state = I40IW_TCP_STATE_CLOSED;
1168                         iwqp->hw_iwarp_state = I40IW_QP_STATE_ERROR;
1169                         iwqp->last_aeq = I40IW_AE_RESET_SENT;
1170                         iwqp->ibqp_state = IB_QPS_ERR;
1171                         spin_unlock_irqrestore(&iwqp->lock, flags);
1172                         i40iw_cm_disconn(iwqp);
1173                 } else {
1174                         spin_unlock_irqrestore(&iwqp->lock, flags);
1175                 }
1176         } else if (rem_node) {
1177                 /* TIME_WAIT state */
1178                 i40iw_rem_ref_cm_node(cm_node);
1179         }
1180         if (cm_id)
1181                 cm_id->rem_ref(cm_id);
1182         kfree(close_entry);
1183         cm_node->close_entry = NULL;
1184 }
1185
1186 /**
1187  * i40iw_build_timer_list - Add cm_nodes to timer list
1188  * @timer_list: ptr to timer list
1189  * @hte: ptr to accelerated or non-accelerated list
1190  */
1191 static void i40iw_build_timer_list(struct list_head *timer_list,
1192                                    struct list_head *hte)
1193 {
1194         struct i40iw_cm_node *cm_node;
1195         struct list_head *list_core_temp, *list_node;
1196
1197         list_for_each_safe(list_node, list_core_temp, hte) {
1198                 cm_node = container_of(list_node, struct i40iw_cm_node, list);
1199                 if (cm_node->close_entry || cm_node->send_entry) {
1200                         atomic_inc(&cm_node->ref_count);
1201                         list_add(&cm_node->timer_entry, timer_list);
1202                 }
1203         }
1204 }
1205
1206 /**
1207  * i40iw_cm_timer_tick - system's timer expired callback
1208  * @pass: Pointing to cm_core
1209  */
1210 static void i40iw_cm_timer_tick(struct timer_list *t)
1211 {
1212         unsigned long nexttimeout = jiffies + I40IW_LONG_TIME;
1213         struct i40iw_cm_node *cm_node;
1214         struct i40iw_timer_entry *send_entry, *close_entry;
1215         struct list_head *list_core_temp;
1216         struct i40iw_sc_vsi *vsi;
1217         struct list_head *list_node;
1218         struct i40iw_cm_core *cm_core = from_timer(cm_core, t, tcp_timer);
1219         u32 settimer = 0;
1220         unsigned long timetosend;
1221         unsigned long flags;
1222
1223         struct list_head timer_list;
1224
1225         INIT_LIST_HEAD(&timer_list);
1226
1227         spin_lock_irqsave(&cm_core->ht_lock, flags);
1228         i40iw_build_timer_list(&timer_list, &cm_core->non_accelerated_list);
1229         i40iw_build_timer_list(&timer_list, &cm_core->accelerated_list);
1230         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1231
1232         list_for_each_safe(list_node, list_core_temp, &timer_list) {
1233                 cm_node = container_of(list_node,
1234                                        struct i40iw_cm_node,
1235                                        timer_entry);
1236                 close_entry = cm_node->close_entry;
1237
1238                 if (close_entry) {
1239                         if (time_after(close_entry->timetosend, jiffies)) {
1240                                 if (nexttimeout > close_entry->timetosend ||
1241                                     !settimer) {
1242                                         nexttimeout = close_entry->timetosend;
1243                                         settimer = 1;
1244                                 }
1245                         } else {
1246                                 i40iw_handle_close_entry(cm_node, 1);
1247                         }
1248                 }
1249
1250                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1251
1252                 send_entry = cm_node->send_entry;
1253                 if (!send_entry)
1254                         goto done;
1255                 if (time_after(send_entry->timetosend, jiffies)) {
1256                         if (cm_node->state != I40IW_CM_STATE_OFFLOADED) {
1257                                 if ((nexttimeout > send_entry->timetosend) ||
1258                                     !settimer) {
1259                                         nexttimeout = send_entry->timetosend;
1260                                         settimer = 1;
1261                                 }
1262                         } else {
1263                                 i40iw_free_retrans_entry(cm_node);
1264                         }
1265                         goto done;
1266                 }
1267
1268                 if ((cm_node->state == I40IW_CM_STATE_OFFLOADED) ||
1269                     (cm_node->state == I40IW_CM_STATE_CLOSED)) {
1270                         i40iw_free_retrans_entry(cm_node);
1271                         goto done;
1272                 }
1273
1274                 if (!send_entry->retranscount || !send_entry->retrycount) {
1275                         i40iw_free_retrans_entry(cm_node);
1276
1277                         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1278                         i40iw_retrans_expired(cm_node);
1279                         cm_node->state = I40IW_CM_STATE_CLOSED;
1280                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1281                         goto done;
1282                 }
1283                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1284
1285                 vsi = &cm_node->iwdev->vsi;
1286
1287                 if (!cm_node->ack_rcvd) {
1288                         atomic_inc(&send_entry->sqbuf->refcount);
1289                         i40iw_puda_send_buf(vsi->ilq, send_entry->sqbuf);
1290                         cm_node->cm_core->stats_pkt_retrans++;
1291                 }
1292                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1293                 if (send_entry->send_retrans) {
1294                         send_entry->retranscount--;
1295                         timetosend = (I40IW_RETRY_TIMEOUT <<
1296                                       (I40IW_DEFAULT_RETRANS -
1297                                        send_entry->retranscount));
1298
1299                         send_entry->timetosend = jiffies +
1300                             min(timetosend, I40IW_MAX_TIMEOUT);
1301                         if (nexttimeout > send_entry->timetosend || !settimer) {
1302                                 nexttimeout = send_entry->timetosend;
1303                                 settimer = 1;
1304                         }
1305                 } else {
1306                         int close_when_complete;
1307
1308                         close_when_complete = send_entry->close_when_complete;
1309                         i40iw_debug(cm_node->dev,
1310                                     I40IW_DEBUG_CM,
1311                                     "cm_node=%p state=%d\n",
1312                                     cm_node,
1313                                     cm_node->state);
1314                         i40iw_free_retrans_entry(cm_node);
1315                         if (close_when_complete)
1316                                 i40iw_rem_ref_cm_node(cm_node);
1317                 }
1318 done:
1319                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1320                 i40iw_rem_ref_cm_node(cm_node);
1321         }
1322
1323         if (settimer) {
1324                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1325                 if (!timer_pending(&cm_core->tcp_timer)) {
1326                         cm_core->tcp_timer.expires = nexttimeout;
1327                         add_timer(&cm_core->tcp_timer);
1328                 }
1329                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1330         }
1331 }
1332
1333 /**
1334  * i40iw_send_syn - send SYN packet
1335  * @cm_node: connection's node
1336  * @sendack: flag to set ACK bit or not
1337  */
1338 int i40iw_send_syn(struct i40iw_cm_node *cm_node, u32 sendack)
1339 {
1340         struct i40iw_puda_buf *sqbuf;
1341         int flags = SET_SYN;
1342         char optionsbuffer[sizeof(struct option_mss) +
1343                            sizeof(struct option_windowscale) +
1344                            sizeof(struct option_base) + TCP_OPTIONS_PADDING];
1345         struct i40iw_kmem_info opts;
1346
1347         int optionssize = 0;
1348         /* Sending MSS option */
1349         union all_known_options *options;
1350
1351         opts.addr = optionsbuffer;
1352         if (!cm_node) {
1353                 i40iw_pr_err("no cm_node\n");
1354                 return -EINVAL;
1355         }
1356
1357         options = (union all_known_options *)&optionsbuffer[optionssize];
1358         options->as_mss.optionnum = OPTION_NUMBER_MSS;
1359         options->as_mss.length = sizeof(struct option_mss);
1360         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
1361         optionssize += sizeof(struct option_mss);
1362
1363         options = (union all_known_options *)&optionsbuffer[optionssize];
1364         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
1365         options->as_windowscale.length = sizeof(struct option_windowscale);
1366         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
1367         optionssize += sizeof(struct option_windowscale);
1368         options = (union all_known_options *)&optionsbuffer[optionssize];
1369         options->as_end = OPTION_NUMBER_END;
1370         optionssize += 1;
1371
1372         if (sendack)
1373                 flags |= SET_ACK;
1374
1375         opts.size = optionssize;
1376
1377         sqbuf = i40iw_form_cm_frame(cm_node, &opts, NULL, NULL, flags);
1378         if (!sqbuf) {
1379                 i40iw_pr_err("no sqbuf\n");
1380                 return -1;
1381         }
1382         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
1383 }
1384
1385 /**
1386  * i40iw_send_ack - Send ACK packet
1387  * @cm_node: connection's node
1388  */
1389 static void i40iw_send_ack(struct i40iw_cm_node *cm_node)
1390 {
1391         struct i40iw_puda_buf *sqbuf;
1392         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
1393
1394         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, SET_ACK);
1395         if (sqbuf)
1396                 i40iw_puda_send_buf(vsi->ilq, sqbuf);
1397         else
1398                 i40iw_pr_err("no sqbuf\n");
1399 }
1400
1401 /**
1402  * i40iw_send_fin - Send FIN pkt
1403  * @cm_node: connection's node
1404  */
1405 static int i40iw_send_fin(struct i40iw_cm_node *cm_node)
1406 {
1407         struct i40iw_puda_buf *sqbuf;
1408
1409         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, SET_ACK | SET_FIN);
1410         if (!sqbuf) {
1411                 i40iw_pr_err("no sqbuf\n");
1412                 return -1;
1413         }
1414         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
1415 }
1416
1417 /**
1418  * i40iw_find_node - find a cm node that matches the reference cm node
1419  * @cm_core: cm's core
1420  * @rem_port: remote tcp port num
1421  * @rem_addr: remote ip addr
1422  * @loc_port: local tcp port num
1423  * @loc_addr: loc ip addr
1424  * @add_refcnt: flag to increment refcount of cm_node
1425  * @accelerated_list: flag for accelerated vs non-accelerated list to search
1426  */
1427 struct i40iw_cm_node *i40iw_find_node(struct i40iw_cm_core *cm_core,
1428                                       u16 rem_port,
1429                                       u32 *rem_addr,
1430                                       u16 loc_port,
1431                                       u32 *loc_addr,
1432                                       bool add_refcnt,
1433                                       bool accelerated_list)
1434 {
1435         struct list_head *hte;
1436         struct i40iw_cm_node *cm_node;
1437         unsigned long flags;
1438
1439         hte = accelerated_list ?
1440               &cm_core->accelerated_list : &cm_core->non_accelerated_list;
1441
1442         /* walk list and find cm_node associated with this session ID */
1443         spin_lock_irqsave(&cm_core->ht_lock, flags);
1444         list_for_each_entry(cm_node, hte, list) {
1445                 if (!memcmp(cm_node->loc_addr, loc_addr, sizeof(cm_node->loc_addr)) &&
1446                     (cm_node->loc_port == loc_port) &&
1447                     !memcmp(cm_node->rem_addr, rem_addr, sizeof(cm_node->rem_addr)) &&
1448                     (cm_node->rem_port == rem_port)) {
1449                         if (add_refcnt)
1450                                 atomic_inc(&cm_node->ref_count);
1451                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1452                         return cm_node;
1453                 }
1454         }
1455         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1456
1457         /* no owner node */
1458         return NULL;
1459 }
1460
1461 /**
1462  * i40iw_find_listener - find a cm node listening on this addr-port pair
1463  * @cm_core: cm's core
1464  * @dst_port: listener tcp port num
1465  * @dst_addr: listener ip addr
1466  * @listener_state: state to match with listen node's
1467  */
1468 static struct i40iw_cm_listener *i40iw_find_listener(
1469                                                      struct i40iw_cm_core *cm_core,
1470                                                      u32 *dst_addr,
1471                                                      u16 dst_port,
1472                                                      u16 vlan_id,
1473                                                      enum i40iw_cm_listener_state
1474                                                      listener_state)
1475 {
1476         struct i40iw_cm_listener *listen_node;
1477         static const u32 ip_zero[4] = { 0, 0, 0, 0 };
1478         u32 listen_addr[4];
1479         u16 listen_port;
1480         unsigned long flags;
1481
1482         /* walk list and find cm_node associated with this session ID */
1483         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1484         list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
1485                 memcpy(listen_addr, listen_node->loc_addr, sizeof(listen_addr));
1486                 listen_port = listen_node->loc_port;
1487                 /* compare node pair, return node handle if a match */
1488                 if ((!memcmp(listen_addr, dst_addr, sizeof(listen_addr)) ||
1489                      !memcmp(listen_addr, ip_zero, sizeof(listen_addr))) &&
1490                      (listen_port == dst_port) &&
1491                      (listener_state & listen_node->listener_state)) {
1492                         atomic_inc(&listen_node->ref_count);
1493                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1494                         return listen_node;
1495                 }
1496         }
1497         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1498         return NULL;
1499 }
1500
1501 /**
1502  * i40iw_add_hte_node - add a cm node to the hash table
1503  * @cm_core: cm's core
1504  * @cm_node: connection's node
1505  */
1506 static void i40iw_add_hte_node(struct i40iw_cm_core *cm_core,
1507                                struct i40iw_cm_node *cm_node)
1508 {
1509         unsigned long flags;
1510
1511         if (!cm_node || !cm_core) {
1512                 i40iw_pr_err("cm_node or cm_core == NULL\n");
1513                 return;
1514         }
1515
1516         spin_lock_irqsave(&cm_core->ht_lock, flags);
1517         list_add_tail(&cm_node->list, &cm_core->non_accelerated_list);
1518         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1519 }
1520
1521 /**
1522  * i40iw_find_port - find port that matches reference port
1523  * @hte: ptr to accelerated or non-accelerated list
1524  * @accelerated_list: flag for accelerated vs non-accelerated list
1525  */
1526 static bool i40iw_find_port(struct list_head *hte, u16 port)
1527 {
1528         struct i40iw_cm_node *cm_node;
1529
1530         list_for_each_entry(cm_node, hte, list) {
1531                 if (cm_node->loc_port == port)
1532                         return true;
1533         }
1534         return false;
1535 }
1536
1537 /**
1538  * i40iw_port_in_use - determine if port is in use
1539  * @cm_core: cm's core
1540  * @port: port number
1541  */
1542 bool i40iw_port_in_use(struct i40iw_cm_core *cm_core, u16 port)
1543 {
1544         struct i40iw_cm_listener *listen_node;
1545         unsigned long flags;
1546
1547         spin_lock_irqsave(&cm_core->ht_lock, flags);
1548         if (i40iw_find_port(&cm_core->accelerated_list, port) ||
1549             i40iw_find_port(&cm_core->non_accelerated_list, port)) {
1550                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1551                 return true;
1552         }
1553         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1554
1555         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1556         list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
1557                 if (listen_node->loc_port == port) {
1558                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1559                         return true;
1560                 }
1561         }
1562         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1563
1564         return false;
1565 }
1566
1567 /**
1568  * i40iw_del_multiple_qhash - Remove qhash and child listens
1569  * @iwdev: iWarp device
1570  * @cm_info: CM info for parent listen node
1571  * @cm_parent_listen_node: The parent listen node
1572  */
1573 static enum i40iw_status_code i40iw_del_multiple_qhash(
1574                                                        struct i40iw_device *iwdev,
1575                                                        struct i40iw_cm_info *cm_info,
1576                                                        struct i40iw_cm_listener *cm_parent_listen_node)
1577 {
1578         struct i40iw_cm_listener *child_listen_node;
1579         enum i40iw_status_code ret = I40IW_ERR_CONFIG;
1580         struct list_head *pos, *tpos;
1581         unsigned long flags;
1582
1583         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1584         list_for_each_safe(pos, tpos, &cm_parent_listen_node->child_listen_list) {
1585                 child_listen_node = list_entry(pos, struct i40iw_cm_listener, child_listen_list);
1586                 if (child_listen_node->ipv4)
1587                         i40iw_debug(&iwdev->sc_dev,
1588                                     I40IW_DEBUG_CM,
1589                                     "removing child listen for IP=%pI4, port=%d, vlan=%d\n",
1590                                     child_listen_node->loc_addr,
1591                                     child_listen_node->loc_port,
1592                                     child_listen_node->vlan_id);
1593                 else
1594                         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM,
1595                                     "removing child listen for IP=%pI6, port=%d, vlan=%d\n",
1596                                     child_listen_node->loc_addr,
1597                                     child_listen_node->loc_port,
1598                                     child_listen_node->vlan_id);
1599                 list_del(pos);
1600                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1601                        sizeof(cm_info->loc_addr));
1602                 cm_info->vlan_id = child_listen_node->vlan_id;
1603                 if (child_listen_node->qhash_set) {
1604                         ret = i40iw_manage_qhash(iwdev, cm_info,
1605                                                  I40IW_QHASH_TYPE_TCP_SYN,
1606                                                  I40IW_QHASH_MANAGE_TYPE_DELETE,
1607                                                  NULL, false);
1608                         child_listen_node->qhash_set = false;
1609                 } else {
1610                         ret = I40IW_SUCCESS;
1611                 }
1612                 i40iw_debug(&iwdev->sc_dev,
1613                             I40IW_DEBUG_CM,
1614                             "freed pointer = %p\n",
1615                             child_listen_node);
1616                 kfree(child_listen_node);
1617                 cm_parent_listen_node->cm_core->stats_listen_nodes_destroyed++;
1618         }
1619         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1620
1621         return ret;
1622 }
1623
1624 /**
1625  * i40iw_netdev_vlan_ipv6 - Gets the netdev and vlan
1626  * @addr: local IPv6 address
1627  * @vlan_id: vlan id for the given IPv6 address
1628  *
1629  * Returns the net_device of the IPv6 address and also sets the
1630  * vlan id for that address.
1631  */
1632 static struct net_device *i40iw_netdev_vlan_ipv6(u32 *addr, u16 *vlan_id)
1633 {
1634         struct net_device *ip_dev = NULL;
1635         struct in6_addr laddr6;
1636
1637         if (!IS_ENABLED(CONFIG_IPV6))
1638                 return NULL;
1639         i40iw_copy_ip_htonl(laddr6.in6_u.u6_addr32, addr);
1640         if (vlan_id)
1641                 *vlan_id = I40IW_NO_VLAN;
1642         rcu_read_lock();
1643         for_each_netdev_rcu(&init_net, ip_dev) {
1644                 if (ipv6_chk_addr(&init_net, &laddr6, ip_dev, 1)) {
1645                         if (vlan_id)
1646                                 *vlan_id = rdma_vlan_dev_vlan_id(ip_dev);
1647                         break;
1648                 }
1649         }
1650         rcu_read_unlock();
1651         return ip_dev;
1652 }
1653
1654 /**
1655  * i40iw_get_vlan_ipv4 - Returns the vlan_id for IPv4 address
1656  * @addr: local IPv4 address
1657  */
1658 static u16 i40iw_get_vlan_ipv4(u32 *addr)
1659 {
1660         struct net_device *netdev;
1661         u16 vlan_id = I40IW_NO_VLAN;
1662
1663         netdev = ip_dev_find(&init_net, htonl(addr[0]));
1664         if (netdev) {
1665                 vlan_id = rdma_vlan_dev_vlan_id(netdev);
1666                 dev_put(netdev);
1667         }
1668         return vlan_id;
1669 }
1670
1671 /**
1672  * i40iw_add_mqh_6 - Adds multiple qhashes for IPv6
1673  * @iwdev: iWarp device
1674  * @cm_info: CM info for parent listen node
1675  * @cm_parent_listen_node: The parent listen node
1676  *
1677  * Adds a qhash and a child listen node for every IPv6 address
1678  * on the adapter and adds the associated qhash filter
1679  */
1680 static enum i40iw_status_code i40iw_add_mqh_6(struct i40iw_device *iwdev,
1681                                               struct i40iw_cm_info *cm_info,
1682                                               struct i40iw_cm_listener *cm_parent_listen_node)
1683 {
1684         struct net_device *ip_dev;
1685         struct inet6_dev *idev;
1686         struct inet6_ifaddr *ifp, *tmp;
1687         enum i40iw_status_code ret = 0;
1688         struct i40iw_cm_listener *child_listen_node;
1689         unsigned long flags;
1690
1691         rtnl_lock();
1692         for_each_netdev(&init_net, ip_dev) {
1693                 if ((((rdma_vlan_dev_vlan_id(ip_dev) < I40IW_NO_VLAN) &&
1694                       (rdma_vlan_dev_real_dev(ip_dev) == iwdev->netdev)) ||
1695                      (ip_dev == iwdev->netdev)) && (ip_dev->flags & IFF_UP)) {
1696                         idev = __in6_dev_get(ip_dev);
1697                         if (!idev) {
1698                                 i40iw_pr_err("idev == NULL\n");
1699                                 break;
1700                         }
1701                         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
1702                                 i40iw_debug(&iwdev->sc_dev,
1703                                             I40IW_DEBUG_CM,
1704                                             "IP=%pI6, vlan_id=%d, MAC=%pM\n",
1705                                             &ifp->addr,
1706                                             rdma_vlan_dev_vlan_id(ip_dev),
1707                                             ip_dev->dev_addr);
1708                                 child_listen_node =
1709                                         kzalloc(sizeof(*child_listen_node), GFP_ATOMIC);
1710                                 i40iw_debug(&iwdev->sc_dev,
1711                                             I40IW_DEBUG_CM,
1712                                             "Allocating child listener %p\n",
1713                                             child_listen_node);
1714                                 if (!child_listen_node) {
1715                                         ret = I40IW_ERR_NO_MEMORY;
1716                                         goto exit;
1717                                 }
1718                                 cm_info->vlan_id = rdma_vlan_dev_vlan_id(ip_dev);
1719                                 cm_parent_listen_node->vlan_id = cm_info->vlan_id;
1720
1721                                 memcpy(child_listen_node, cm_parent_listen_node,
1722                                        sizeof(*child_listen_node));
1723
1724                                 i40iw_copy_ip_ntohl(child_listen_node->loc_addr,
1725                                                     ifp->addr.in6_u.u6_addr32);
1726                                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1727                                        sizeof(cm_info->loc_addr));
1728
1729                                 ret = i40iw_manage_qhash(iwdev, cm_info,
1730                                                          I40IW_QHASH_TYPE_TCP_SYN,
1731                                                          I40IW_QHASH_MANAGE_TYPE_ADD,
1732                                                          NULL, true);
1733                                 if (!ret) {
1734                                         child_listen_node->qhash_set = true;
1735                                         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1736                                         list_add(&child_listen_node->child_listen_list,
1737                                                  &cm_parent_listen_node->child_listen_list);
1738                                         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1739                                         cm_parent_listen_node->cm_core->stats_listen_nodes_created++;
1740                                 } else {
1741                                         kfree(child_listen_node);
1742                                 }
1743                         }
1744                 }
1745         }
1746 exit:
1747         rtnl_unlock();
1748         return ret;
1749 }
1750
1751 /**
1752  * i40iw_add_mqh_4 - Adds multiple qhashes for IPv4
1753  * @iwdev: iWarp device
1754  * @cm_info: CM info for parent listen node
1755  * @cm_parent_listen_node: The parent listen node
1756  *
1757  * Adds a qhash and a child listen node for every IPv4 address
1758  * on the adapter and adds the associated qhash filter
1759  */
1760 static enum i40iw_status_code i40iw_add_mqh_4(
1761                                 struct i40iw_device *iwdev,
1762                                 struct i40iw_cm_info *cm_info,
1763                                 struct i40iw_cm_listener *cm_parent_listen_node)
1764 {
1765         struct net_device *dev;
1766         struct in_device *idev;
1767         struct i40iw_cm_listener *child_listen_node;
1768         enum i40iw_status_code ret = 0;
1769         unsigned long flags;
1770
1771         rtnl_lock();
1772         for_each_netdev(&init_net, dev) {
1773                 if ((((rdma_vlan_dev_vlan_id(dev) < I40IW_NO_VLAN) &&
1774                       (rdma_vlan_dev_real_dev(dev) == iwdev->netdev)) ||
1775                     (dev == iwdev->netdev)) && (dev->flags & IFF_UP)) {
1776                         const struct in_ifaddr *ifa;
1777
1778                         idev = in_dev_get(dev);
1779
1780                         in_dev_for_each_ifa_rtnl(ifa, idev) {
1781                                 i40iw_debug(&iwdev->sc_dev,
1782                                             I40IW_DEBUG_CM,
1783                                             "Allocating child CM Listener forIP=%pI4, vlan_id=%d, MAC=%pM\n",
1784                                             &ifa->ifa_address,
1785                                             rdma_vlan_dev_vlan_id(dev),
1786                                             dev->dev_addr);
1787                                 child_listen_node = kzalloc(sizeof(*child_listen_node), GFP_KERNEL);
1788                                 cm_parent_listen_node->cm_core->stats_listen_nodes_created++;
1789                                 i40iw_debug(&iwdev->sc_dev,
1790                                             I40IW_DEBUG_CM,
1791                                             "Allocating child listener %p\n",
1792                                             child_listen_node);
1793                                 if (!child_listen_node) {
1794                                         in_dev_put(idev);
1795                                         ret = I40IW_ERR_NO_MEMORY;
1796                                         goto exit;
1797                                 }
1798                                 cm_info->vlan_id = rdma_vlan_dev_vlan_id(dev);
1799                                 cm_parent_listen_node->vlan_id = cm_info->vlan_id;
1800                                 memcpy(child_listen_node,
1801                                        cm_parent_listen_node,
1802                                        sizeof(*child_listen_node));
1803
1804                                 child_listen_node->loc_addr[0] = ntohl(ifa->ifa_address);
1805                                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1806                                        sizeof(cm_info->loc_addr));
1807
1808                                 ret = i40iw_manage_qhash(iwdev,
1809                                                          cm_info,
1810                                                          I40IW_QHASH_TYPE_TCP_SYN,
1811                                                          I40IW_QHASH_MANAGE_TYPE_ADD,
1812                                                          NULL,
1813                                                          true);
1814                                 if (!ret) {
1815                                         child_listen_node->qhash_set = true;
1816                                         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1817                                         list_add(&child_listen_node->child_listen_list,
1818                                                  &cm_parent_listen_node->child_listen_list);
1819                                         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1820                                 } else {
1821                                         kfree(child_listen_node);
1822                                         cm_parent_listen_node->cm_core->stats_listen_nodes_created--;
1823                                 }
1824                         }
1825
1826                         in_dev_put(idev);
1827                 }
1828         }
1829 exit:
1830         rtnl_unlock();
1831         return ret;
1832 }
1833
1834 /**
1835  * i40iw_dec_refcnt_listen - delete listener and associated cm nodes
1836  * @cm_core: cm's core
1837  * @free_hanging_nodes: to free associated cm_nodes
1838  * @apbvt_del: flag to delete the apbvt
1839  */
1840 static int i40iw_dec_refcnt_listen(struct i40iw_cm_core *cm_core,
1841                                    struct i40iw_cm_listener *listener,
1842                                    int free_hanging_nodes, bool apbvt_del)
1843 {
1844         int ret = -EINVAL;
1845         int err = 0;
1846         struct list_head *list_pos;
1847         struct list_head *list_temp;
1848         struct i40iw_cm_node *cm_node;
1849         struct list_head reset_list;
1850         struct i40iw_cm_info nfo;
1851         struct i40iw_cm_node *loopback;
1852         enum i40iw_cm_node_state old_state;
1853         unsigned long flags;
1854
1855         /* free non-accelerated child nodes for this listener */
1856         INIT_LIST_HEAD(&reset_list);
1857         if (free_hanging_nodes) {
1858                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1859                 list_for_each_safe(list_pos,
1860                                    list_temp, &cm_core->non_accelerated_list) {
1861                         cm_node = container_of(list_pos, struct i40iw_cm_node, list);
1862                         if ((cm_node->listener == listener) &&
1863                             !cm_node->accelerated) {
1864                                 atomic_inc(&cm_node->ref_count);
1865                                 list_add(&cm_node->reset_entry, &reset_list);
1866                         }
1867                 }
1868                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1869         }
1870
1871         list_for_each_safe(list_pos, list_temp, &reset_list) {
1872                 cm_node = container_of(list_pos, struct i40iw_cm_node, reset_entry);
1873                 loopback = cm_node->loopbackpartner;
1874                 if (cm_node->state >= I40IW_CM_STATE_FIN_WAIT1) {
1875                         i40iw_rem_ref_cm_node(cm_node);
1876                 } else {
1877                         if (!loopback) {
1878                                 i40iw_cleanup_retrans_entry(cm_node);
1879                                 err = i40iw_send_reset(cm_node);
1880                                 if (err) {
1881                                         cm_node->state = I40IW_CM_STATE_CLOSED;
1882                                         i40iw_pr_err("send reset\n");
1883                                 } else {
1884                                         old_state = cm_node->state;
1885                                         cm_node->state = I40IW_CM_STATE_LISTENER_DESTROYED;
1886                                         if (old_state != I40IW_CM_STATE_MPAREQ_RCVD)
1887                                                 i40iw_rem_ref_cm_node(cm_node);
1888                                 }
1889                         } else {
1890                                 struct i40iw_cm_event event;
1891
1892                                 event.cm_node = loopback;
1893                                 memcpy(event.cm_info.rem_addr,
1894                                        loopback->rem_addr, sizeof(event.cm_info.rem_addr));
1895                                 memcpy(event.cm_info.loc_addr,
1896                                        loopback->loc_addr, sizeof(event.cm_info.loc_addr));
1897                                 event.cm_info.rem_port = loopback->rem_port;
1898                                 event.cm_info.loc_port = loopback->loc_port;
1899                                 event.cm_info.cm_id = loopback->cm_id;
1900                                 event.cm_info.ipv4 = loopback->ipv4;
1901                                 atomic_inc(&loopback->ref_count);
1902                                 loopback->state = I40IW_CM_STATE_CLOSED;
1903                                 i40iw_event_connect_error(&event);
1904                                 cm_node->state = I40IW_CM_STATE_LISTENER_DESTROYED;
1905                                 i40iw_rem_ref_cm_node(cm_node);
1906                         }
1907                 }
1908         }
1909
1910         if (!atomic_dec_return(&listener->ref_count)) {
1911                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1912                 list_del(&listener->list);
1913                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1914
1915                 if (listener->iwdev) {
1916                         if (apbvt_del)
1917                                 i40iw_manage_apbvt(listener->iwdev,
1918                                                    listener->loc_port,
1919                                                    I40IW_MANAGE_APBVT_DEL);
1920
1921                         memcpy(nfo.loc_addr, listener->loc_addr, sizeof(nfo.loc_addr));
1922                         nfo.loc_port = listener->loc_port;
1923                         nfo.ipv4 = listener->ipv4;
1924                         nfo.vlan_id = listener->vlan_id;
1925                         nfo.user_pri = listener->user_pri;
1926
1927                         if (!list_empty(&listener->child_listen_list)) {
1928                                 i40iw_del_multiple_qhash(listener->iwdev, &nfo, listener);
1929                         } else {
1930                                 if (listener->qhash_set)
1931                                         i40iw_manage_qhash(listener->iwdev,
1932                                                            &nfo,
1933                                                            I40IW_QHASH_TYPE_TCP_SYN,
1934                                                            I40IW_QHASH_MANAGE_TYPE_DELETE,
1935                                                            NULL,
1936                                                            false);
1937                         }
1938                 }
1939
1940                 cm_core->stats_listen_destroyed++;
1941                 kfree(listener);
1942                 cm_core->stats_listen_nodes_destroyed++;
1943                 listener = NULL;
1944                 ret = 0;
1945         }
1946
1947         if (listener) {
1948                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1949                         i40iw_debug(cm_core->dev,
1950                                     I40IW_DEBUG_CM,
1951                                     "%s: listener (%p) pending accepts=%u\n",
1952                                     __func__,
1953                                     listener,
1954                                     atomic_read(&listener->pend_accepts_cnt));
1955         }
1956
1957         return ret;
1958 }
1959
1960 /**
1961  * i40iw_cm_del_listen - delete a linstener
1962  * @cm_core: cm's core
1963   * @listener: passive connection's listener
1964  * @apbvt_del: flag to delete apbvt
1965  */
1966 static int i40iw_cm_del_listen(struct i40iw_cm_core *cm_core,
1967                                struct i40iw_cm_listener *listener,
1968                                bool apbvt_del)
1969 {
1970         listener->listener_state = I40IW_CM_LISTENER_PASSIVE_STATE;
1971         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1972         return i40iw_dec_refcnt_listen(cm_core, listener, 1, apbvt_del);
1973 }
1974
1975 /**
1976  * i40iw_addr_resolve_neigh - resolve neighbor address
1977  * @iwdev: iwarp device structure
1978  * @src_ip: local ip address
1979  * @dst_ip: remote ip address
1980  * @arpindex: if there is an arp entry
1981  */
1982 static int i40iw_addr_resolve_neigh(struct i40iw_device *iwdev,
1983                                     u32 src_ip,
1984                                     u32 dst_ip,
1985                                     int arpindex)
1986 {
1987         struct rtable *rt;
1988         struct neighbour *neigh;
1989         int rc = arpindex;
1990         struct net_device *netdev = iwdev->netdev;
1991         __be32 dst_ipaddr = htonl(dst_ip);
1992         __be32 src_ipaddr = htonl(src_ip);
1993
1994         rt = ip_route_output(&init_net, dst_ipaddr, src_ipaddr, 0, 0);
1995         if (IS_ERR(rt)) {
1996                 i40iw_pr_err("ip_route_output\n");
1997                 return rc;
1998         }
1999
2000         if (netif_is_bond_slave(netdev))
2001                 netdev = netdev_master_upper_dev_get(netdev);
2002
2003         neigh = dst_neigh_lookup(&rt->dst, &dst_ipaddr);
2004
2005         rcu_read_lock();
2006         if (neigh) {
2007                 if (neigh->nud_state & NUD_VALID) {
2008                         if (arpindex >= 0) {
2009                                 if (ether_addr_equal(iwdev->arp_table[arpindex].mac_addr,
2010                                                      neigh->ha))
2011                                         /* Mac address same as arp table */
2012                                         goto resolve_neigh_exit;
2013                                 i40iw_manage_arp_cache(iwdev,
2014                                                        iwdev->arp_table[arpindex].mac_addr,
2015                                                        &dst_ip,
2016                                                        true,
2017                                                        I40IW_ARP_DELETE);
2018                         }
2019
2020                         i40iw_manage_arp_cache(iwdev, neigh->ha, &dst_ip, true, I40IW_ARP_ADD);
2021                         rc = i40iw_arp_table(iwdev, &dst_ip, true, NULL, I40IW_ARP_RESOLVE);
2022                 } else {
2023                         neigh_event_send(neigh, NULL);
2024                 }
2025         }
2026  resolve_neigh_exit:
2027
2028         rcu_read_unlock();
2029         if (neigh)
2030                 neigh_release(neigh);
2031
2032         ip_rt_put(rt);
2033         return rc;
2034 }
2035
2036 /**
2037  * i40iw_get_dst_ipv6
2038  */
2039 static struct dst_entry *i40iw_get_dst_ipv6(struct sockaddr_in6 *src_addr,
2040                                             struct sockaddr_in6 *dst_addr)
2041 {
2042         struct dst_entry *dst;
2043         struct flowi6 fl6;
2044
2045         memset(&fl6, 0, sizeof(fl6));
2046         fl6.daddr = dst_addr->sin6_addr;
2047         fl6.saddr = src_addr->sin6_addr;
2048         if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
2049                 fl6.flowi6_oif = dst_addr->sin6_scope_id;
2050
2051         dst = ip6_route_output(&init_net, NULL, &fl6);
2052         return dst;
2053 }
2054
2055 /**
2056  * i40iw_addr_resolve_neigh_ipv6 - resolve neighbor ipv6 address
2057  * @iwdev: iwarp device structure
2058  * @dst_ip: remote ip address
2059  * @arpindex: if there is an arp entry
2060  */
2061 static int i40iw_addr_resolve_neigh_ipv6(struct i40iw_device *iwdev,
2062                                          u32 *src,
2063                                          u32 *dest,
2064                                          int arpindex)
2065 {
2066         struct neighbour *neigh;
2067         int rc = arpindex;
2068         struct net_device *netdev = iwdev->netdev;
2069         struct dst_entry *dst;
2070         struct sockaddr_in6 dst_addr;
2071         struct sockaddr_in6 src_addr;
2072
2073         memset(&dst_addr, 0, sizeof(dst_addr));
2074         dst_addr.sin6_family = AF_INET6;
2075         i40iw_copy_ip_htonl(dst_addr.sin6_addr.in6_u.u6_addr32, dest);
2076         memset(&src_addr, 0, sizeof(src_addr));
2077         src_addr.sin6_family = AF_INET6;
2078         i40iw_copy_ip_htonl(src_addr.sin6_addr.in6_u.u6_addr32, src);
2079         dst = i40iw_get_dst_ipv6(&src_addr, &dst_addr);
2080         if (!dst || dst->error) {
2081                 if (dst) {
2082                         dst_release(dst);
2083                         i40iw_pr_err("ip6_route_output returned dst->error = %d\n",
2084                                      dst->error);
2085                 }
2086                 return rc;
2087         }
2088
2089         if (netif_is_bond_slave(netdev))
2090                 netdev = netdev_master_upper_dev_get(netdev);
2091
2092         neigh = dst_neigh_lookup(dst, dst_addr.sin6_addr.in6_u.u6_addr32);
2093
2094         rcu_read_lock();
2095         if (neigh) {
2096                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM, "dst_neigh_lookup MAC=%pM\n", neigh->ha);
2097                 if (neigh->nud_state & NUD_VALID) {
2098                         if (arpindex >= 0) {
2099                                 if (ether_addr_equal
2100                                     (iwdev->arp_table[arpindex].mac_addr,
2101                                      neigh->ha)) {
2102                                         /* Mac address same as in arp table */
2103                                         goto resolve_neigh_exit6;
2104                                 }
2105                                 i40iw_manage_arp_cache(iwdev,
2106                                                        iwdev->arp_table[arpindex].mac_addr,
2107                                                        dest,
2108                                                        false,
2109                                                        I40IW_ARP_DELETE);
2110                         }
2111                         i40iw_manage_arp_cache(iwdev,
2112                                                neigh->ha,
2113                                                dest,
2114                                                false,
2115                                                I40IW_ARP_ADD);
2116                         rc = i40iw_arp_table(iwdev,
2117                                              dest,
2118                                              false,
2119                                              NULL,
2120                                              I40IW_ARP_RESOLVE);
2121                 } else {
2122                         neigh_event_send(neigh, NULL);
2123                 }
2124         }
2125
2126  resolve_neigh_exit6:
2127         rcu_read_unlock();
2128         if (neigh)
2129                 neigh_release(neigh);
2130         dst_release(dst);
2131         return rc;
2132 }
2133
2134 /**
2135  * i40iw_ipv4_is_loopback - check if loopback
2136  * @loc_addr: local addr to compare
2137  * @rem_addr: remote address
2138  */
2139 static bool i40iw_ipv4_is_loopback(u32 loc_addr, u32 rem_addr)
2140 {
2141         return ipv4_is_loopback(htonl(rem_addr)) || (loc_addr == rem_addr);
2142 }
2143
2144 /**
2145  * i40iw_ipv6_is_loopback - check if loopback
2146  * @loc_addr: local addr to compare
2147  * @rem_addr: remote address
2148  */
2149 static bool i40iw_ipv6_is_loopback(u32 *loc_addr, u32 *rem_addr)
2150 {
2151         struct in6_addr raddr6;
2152
2153         i40iw_copy_ip_htonl(raddr6.in6_u.u6_addr32, rem_addr);
2154         return !memcmp(loc_addr, rem_addr, 16) || ipv6_addr_loopback(&raddr6);
2155 }
2156
2157 /**
2158  * i40iw_make_cm_node - create a new instance of a cm node
2159  * @cm_core: cm's core
2160  * @iwdev: iwarp device structure
2161  * @cm_info: quad info for connection
2162  * @listener: passive connection's listener
2163  */
2164 static struct i40iw_cm_node *i40iw_make_cm_node(
2165                                    struct i40iw_cm_core *cm_core,
2166                                    struct i40iw_device *iwdev,
2167                                    struct i40iw_cm_info *cm_info,
2168                                    struct i40iw_cm_listener *listener)
2169 {
2170         struct i40iw_cm_node *cm_node;
2171         int oldarpindex;
2172         int arpindex;
2173         struct net_device *netdev = iwdev->netdev;
2174
2175         /* create an hte and cm_node for this instance */
2176         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
2177         if (!cm_node)
2178                 return NULL;
2179
2180         /* set our node specific transport info */
2181         cm_node->ipv4 = cm_info->ipv4;
2182         cm_node->vlan_id = cm_info->vlan_id;
2183         if ((cm_node->vlan_id == I40IW_NO_VLAN) && iwdev->dcb)
2184                 cm_node->vlan_id = 0;
2185         cm_node->tos = cm_info->tos;
2186         cm_node->user_pri = cm_info->user_pri;
2187         if (listener) {
2188                 if (listener->tos != cm_info->tos)
2189                         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB,
2190                                     "application TOS[%d] and remote client TOS[%d] mismatch\n",
2191                                      listener->tos, cm_info->tos);
2192                 cm_node->tos = max(listener->tos, cm_info->tos);
2193                 cm_node->user_pri = rt_tos2priority(cm_node->tos);
2194                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB, "listener: TOS:[%d] UP:[%d]\n",
2195                             cm_node->tos, cm_node->user_pri);
2196         }
2197         memcpy(cm_node->loc_addr, cm_info->loc_addr, sizeof(cm_node->loc_addr));
2198         memcpy(cm_node->rem_addr, cm_info->rem_addr, sizeof(cm_node->rem_addr));
2199         cm_node->loc_port = cm_info->loc_port;
2200         cm_node->rem_port = cm_info->rem_port;
2201
2202         cm_node->mpa_frame_rev = iwdev->mpa_version;
2203         cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
2204         cm_node->ird_size = I40IW_MAX_IRD_SIZE;
2205         cm_node->ord_size = I40IW_MAX_ORD_SIZE;
2206
2207         cm_node->listener = listener;
2208         cm_node->cm_id = cm_info->cm_id;
2209         ether_addr_copy(cm_node->loc_mac, netdev->dev_addr);
2210         spin_lock_init(&cm_node->retrans_list_lock);
2211         cm_node->ack_rcvd = false;
2212
2213         atomic_set(&cm_node->ref_count, 1);
2214         /* associate our parent CM core */
2215         cm_node->cm_core = cm_core;
2216         cm_node->tcp_cntxt.loc_id = I40IW_CM_DEF_LOCAL_ID;
2217         cm_node->tcp_cntxt.rcv_wscale = I40IW_CM_DEFAULT_RCV_WND_SCALE;
2218         cm_node->tcp_cntxt.rcv_wnd =
2219                         I40IW_CM_DEFAULT_RCV_WND_SCALED >> I40IW_CM_DEFAULT_RCV_WND_SCALE;
2220         if (cm_node->ipv4) {
2221                 cm_node->tcp_cntxt.loc_seq_num = secure_tcp_seq(htonl(cm_node->loc_addr[0]),
2222                                                         htonl(cm_node->rem_addr[0]),
2223                                                         htons(cm_node->loc_port),
2224                                                         htons(cm_node->rem_port));
2225                 cm_node->tcp_cntxt.mss = iwdev->vsi.mtu - I40IW_MTU_TO_MSS_IPV4;
2226         } else if (IS_ENABLED(CONFIG_IPV6)) {
2227                 __be32 loc[4] = {
2228                         htonl(cm_node->loc_addr[0]), htonl(cm_node->loc_addr[1]),
2229                         htonl(cm_node->loc_addr[2]), htonl(cm_node->loc_addr[3])
2230                 };
2231                 __be32 rem[4] = {
2232                         htonl(cm_node->rem_addr[0]), htonl(cm_node->rem_addr[1]),
2233                         htonl(cm_node->rem_addr[2]), htonl(cm_node->rem_addr[3])
2234                 };
2235                 cm_node->tcp_cntxt.loc_seq_num = secure_tcpv6_seq(loc, rem,
2236                                                         htons(cm_node->loc_port),
2237                                                         htons(cm_node->rem_port));
2238                 cm_node->tcp_cntxt.mss = iwdev->vsi.mtu - I40IW_MTU_TO_MSS_IPV6;
2239         }
2240
2241         cm_node->iwdev = iwdev;
2242         cm_node->dev = &iwdev->sc_dev;
2243
2244         if ((cm_node->ipv4 &&
2245              i40iw_ipv4_is_loopback(cm_node->loc_addr[0], cm_node->rem_addr[0])) ||
2246              (!cm_node->ipv4 && i40iw_ipv6_is_loopback(cm_node->loc_addr,
2247                                                        cm_node->rem_addr))) {
2248                 arpindex = i40iw_arp_table(iwdev,
2249                                            cm_node->rem_addr,
2250                                            false,
2251                                            NULL,
2252                                            I40IW_ARP_RESOLVE);
2253         } else {
2254                 oldarpindex = i40iw_arp_table(iwdev,
2255                                               cm_node->rem_addr,
2256                                               false,
2257                                               NULL,
2258                                               I40IW_ARP_RESOLVE);
2259                 if (cm_node->ipv4)
2260                         arpindex = i40iw_addr_resolve_neigh(iwdev,
2261                                                             cm_info->loc_addr[0],
2262                                                             cm_info->rem_addr[0],
2263                                                             oldarpindex);
2264                 else if (IS_ENABLED(CONFIG_IPV6))
2265                         arpindex = i40iw_addr_resolve_neigh_ipv6(iwdev,
2266                                                                  cm_info->loc_addr,
2267                                                                  cm_info->rem_addr,
2268                                                                  oldarpindex);
2269                 else
2270                         arpindex = -EINVAL;
2271         }
2272         if (arpindex < 0) {
2273                 i40iw_pr_err("cm_node arpindex\n");
2274                 kfree(cm_node);
2275                 return NULL;
2276         }
2277         ether_addr_copy(cm_node->rem_mac, iwdev->arp_table[arpindex].mac_addr);
2278         i40iw_add_hte_node(cm_core, cm_node);
2279         cm_core->stats_nodes_created++;
2280         return cm_node;
2281 }
2282
2283 /**
2284  * i40iw_rem_ref_cm_node - destroy an instance of a cm node
2285  * @cm_node: connection's node
2286  */
2287 static void i40iw_rem_ref_cm_node(struct i40iw_cm_node *cm_node)
2288 {
2289         struct i40iw_cm_core *cm_core = cm_node->cm_core;
2290         struct i40iw_qp *iwqp;
2291         struct i40iw_cm_info nfo;
2292         unsigned long flags;
2293
2294         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
2295         if (atomic_dec_return(&cm_node->ref_count)) {
2296                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
2297                 return;
2298         }
2299         list_del(&cm_node->list);
2300         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
2301
2302         /* if the node is destroyed before connection was accelerated */
2303         if (!cm_node->accelerated && cm_node->accept_pend) {
2304                 pr_err("node destroyed before established\n");
2305                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
2306         }
2307         if (cm_node->close_entry)
2308                 i40iw_handle_close_entry(cm_node, 0);
2309         if (cm_node->listener) {
2310                 i40iw_dec_refcnt_listen(cm_core, cm_node->listener, 0, true);
2311         } else {
2312                 if (cm_node->apbvt_set) {
2313                         i40iw_manage_apbvt(cm_node->iwdev,
2314                                            cm_node->loc_port,
2315                                            I40IW_MANAGE_APBVT_DEL);
2316                         cm_node->apbvt_set = 0;
2317                 }
2318                 i40iw_get_addr_info(cm_node, &nfo);
2319                 if (cm_node->qhash_set) {
2320                         i40iw_manage_qhash(cm_node->iwdev,
2321                                            &nfo,
2322                                            I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2323                                            I40IW_QHASH_MANAGE_TYPE_DELETE,
2324                                            NULL,
2325                                            false);
2326                         cm_node->qhash_set = 0;
2327                 }
2328         }
2329
2330         iwqp = cm_node->iwqp;
2331         if (iwqp) {
2332                 iwqp->cm_node = NULL;
2333                 i40iw_rem_ref(&iwqp->ibqp);
2334                 cm_node->iwqp = NULL;
2335         } else if (cm_node->qhash_set) {
2336                 i40iw_get_addr_info(cm_node, &nfo);
2337                 i40iw_manage_qhash(cm_node->iwdev,
2338                                    &nfo,
2339                                    I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2340                                    I40IW_QHASH_MANAGE_TYPE_DELETE,
2341                                    NULL,
2342                                    false);
2343                 cm_node->qhash_set = 0;
2344         }
2345
2346         cm_node->cm_core->stats_nodes_destroyed++;
2347         kfree(cm_node);
2348 }
2349
2350 /**
2351  * i40iw_handle_fin_pkt - FIN packet received
2352  * @cm_node: connection's node
2353  */
2354 static void i40iw_handle_fin_pkt(struct i40iw_cm_node *cm_node)
2355 {
2356         u32 ret;
2357
2358         switch (cm_node->state) {
2359         case I40IW_CM_STATE_SYN_RCVD:
2360         case I40IW_CM_STATE_SYN_SENT:
2361         case I40IW_CM_STATE_ESTABLISHED:
2362         case I40IW_CM_STATE_MPAREJ_RCVD:
2363                 cm_node->tcp_cntxt.rcv_nxt++;
2364                 i40iw_cleanup_retrans_entry(cm_node);
2365                 cm_node->state = I40IW_CM_STATE_LAST_ACK;
2366                 i40iw_send_fin(cm_node);
2367                 break;
2368         case I40IW_CM_STATE_MPAREQ_SENT:
2369                 i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
2370                 cm_node->tcp_cntxt.rcv_nxt++;
2371                 i40iw_cleanup_retrans_entry(cm_node);
2372                 cm_node->state = I40IW_CM_STATE_CLOSED;
2373                 atomic_inc(&cm_node->ref_count);
2374                 i40iw_send_reset(cm_node);
2375                 break;
2376         case I40IW_CM_STATE_FIN_WAIT1:
2377                 cm_node->tcp_cntxt.rcv_nxt++;
2378                 i40iw_cleanup_retrans_entry(cm_node);
2379                 cm_node->state = I40IW_CM_STATE_CLOSING;
2380                 i40iw_send_ack(cm_node);
2381                 /*
2382                  * Wait for ACK as this is simultaneous close.
2383                  * After we receive ACK, do not send anything.
2384                  * Just rm the node.
2385                  */
2386                 break;
2387         case I40IW_CM_STATE_FIN_WAIT2:
2388                 cm_node->tcp_cntxt.rcv_nxt++;
2389                 i40iw_cleanup_retrans_entry(cm_node);
2390                 cm_node->state = I40IW_CM_STATE_TIME_WAIT;
2391                 i40iw_send_ack(cm_node);
2392                 ret =
2393                     i40iw_schedule_cm_timer(cm_node, NULL, I40IW_TIMER_TYPE_CLOSE, 1, 0);
2394                 if (ret)
2395                         i40iw_pr_err("node %p state = %d\n", cm_node, cm_node->state);
2396                 break;
2397         case I40IW_CM_STATE_TIME_WAIT:
2398                 cm_node->tcp_cntxt.rcv_nxt++;
2399                 i40iw_cleanup_retrans_entry(cm_node);
2400                 cm_node->state = I40IW_CM_STATE_CLOSED;
2401                 i40iw_rem_ref_cm_node(cm_node);
2402                 break;
2403         case I40IW_CM_STATE_OFFLOADED:
2404         default:
2405                 i40iw_pr_err("bad state node %p state = %d\n", cm_node, cm_node->state);
2406                 break;
2407         }
2408 }
2409
2410 /**
2411  * i40iw_handle_rst_pkt - process received RST packet
2412  * @cm_node: connection's node
2413  * @rbuf: receive buffer
2414  */
2415 static void i40iw_handle_rst_pkt(struct i40iw_cm_node *cm_node,
2416                                  struct i40iw_puda_buf *rbuf)
2417 {
2418         i40iw_cleanup_retrans_entry(cm_node);
2419         switch (cm_node->state) {
2420         case I40IW_CM_STATE_SYN_SENT:
2421         case I40IW_CM_STATE_MPAREQ_SENT:
2422                 switch (cm_node->mpa_frame_rev) {
2423                 case IETF_MPA_V2:
2424                         cm_node->mpa_frame_rev = IETF_MPA_V1;
2425                         /* send a syn and goto syn sent state */
2426                         cm_node->state = I40IW_CM_STATE_SYN_SENT;
2427                         if (i40iw_send_syn(cm_node, 0))
2428                                 i40iw_active_open_err(cm_node, false);
2429                         break;
2430                 case IETF_MPA_V1:
2431                 default:
2432                         i40iw_active_open_err(cm_node, false);
2433                         break;
2434                 }
2435                 break;
2436         case I40IW_CM_STATE_MPAREQ_RCVD:
2437                 atomic_add_return(1, &cm_node->passive_state);
2438                 break;
2439         case I40IW_CM_STATE_ESTABLISHED:
2440         case I40IW_CM_STATE_SYN_RCVD:
2441         case I40IW_CM_STATE_LISTENING:
2442                 i40iw_pr_err("Bad state state = %d\n", cm_node->state);
2443                 i40iw_passive_open_err(cm_node, false);
2444                 break;
2445         case I40IW_CM_STATE_OFFLOADED:
2446                 i40iw_active_open_err(cm_node, false);
2447                 break;
2448         case I40IW_CM_STATE_CLOSED:
2449                 break;
2450         case I40IW_CM_STATE_FIN_WAIT2:
2451         case I40IW_CM_STATE_FIN_WAIT1:
2452         case I40IW_CM_STATE_LAST_ACK:
2453                 cm_node->cm_id->rem_ref(cm_node->cm_id);
2454                 /* fall through */
2455         case I40IW_CM_STATE_TIME_WAIT:
2456                 cm_node->state = I40IW_CM_STATE_CLOSED;
2457                 i40iw_rem_ref_cm_node(cm_node);
2458                 break;
2459         default:
2460                 break;
2461         }
2462 }
2463
2464 /**
2465  * i40iw_handle_rcv_mpa - Process a recv'd mpa buffer
2466  * @cm_node: connection's node
2467  * @rbuf: receive buffer
2468  */
2469 static void i40iw_handle_rcv_mpa(struct i40iw_cm_node *cm_node,
2470                                  struct i40iw_puda_buf *rbuf)
2471 {
2472         int ret;
2473         int datasize = rbuf->datalen;
2474         u8 *dataloc = rbuf->data;
2475
2476         enum i40iw_cm_event_type type = I40IW_CM_EVENT_UNKNOWN;
2477         u32 res_type;
2478
2479         ret = i40iw_parse_mpa(cm_node, dataloc, &res_type, datasize);
2480         if (ret) {
2481                 if (cm_node->state == I40IW_CM_STATE_MPAREQ_SENT)
2482                         i40iw_active_open_err(cm_node, true);
2483                 else
2484                         i40iw_passive_open_err(cm_node, true);
2485                 return;
2486         }
2487
2488         switch (cm_node->state) {
2489         case I40IW_CM_STATE_ESTABLISHED:
2490                 if (res_type == I40IW_MPA_REQUEST_REJECT)
2491                         i40iw_pr_err("state for reject\n");
2492                 cm_node->state = I40IW_CM_STATE_MPAREQ_RCVD;
2493                 type = I40IW_CM_EVENT_MPA_REQ;
2494                 i40iw_send_ack(cm_node);        /* ACK received MPA request */
2495                 atomic_set(&cm_node->passive_state,
2496                            I40IW_PASSIVE_STATE_INDICATED);
2497                 break;
2498         case I40IW_CM_STATE_MPAREQ_SENT:
2499                 i40iw_cleanup_retrans_entry(cm_node);
2500                 if (res_type == I40IW_MPA_REQUEST_REJECT) {
2501                         type = I40IW_CM_EVENT_MPA_REJECT;
2502                         cm_node->state = I40IW_CM_STATE_MPAREJ_RCVD;
2503                 } else {
2504                         type = I40IW_CM_EVENT_CONNECTED;
2505                         cm_node->state = I40IW_CM_STATE_OFFLOADED;
2506                 }
2507                 i40iw_send_ack(cm_node);
2508                 break;
2509         default:
2510                 pr_err("%s wrong cm_node state =%d\n", __func__, cm_node->state);
2511                 break;
2512         }
2513         i40iw_create_event(cm_node, type);
2514 }
2515
2516 /**
2517  * i40iw_indicate_pkt_err - Send up err event to cm
2518  * @cm_node: connection's node
2519  */
2520 static void i40iw_indicate_pkt_err(struct i40iw_cm_node *cm_node)
2521 {
2522         switch (cm_node->state) {
2523         case I40IW_CM_STATE_SYN_SENT:
2524         case I40IW_CM_STATE_MPAREQ_SENT:
2525                 i40iw_active_open_err(cm_node, true);
2526                 break;
2527         case I40IW_CM_STATE_ESTABLISHED:
2528         case I40IW_CM_STATE_SYN_RCVD:
2529                 i40iw_passive_open_err(cm_node, true);
2530                 break;
2531         case I40IW_CM_STATE_OFFLOADED:
2532         default:
2533                 break;
2534         }
2535 }
2536
2537 /**
2538  * i40iw_check_syn - Check for error on received syn ack
2539  * @cm_node: connection's node
2540  * @tcph: pointer tcp header
2541  */
2542 static int i40iw_check_syn(struct i40iw_cm_node *cm_node, struct tcphdr *tcph)
2543 {
2544         int err = 0;
2545
2546         if (ntohl(tcph->ack_seq) != cm_node->tcp_cntxt.loc_seq_num) {
2547                 err = 1;
2548                 i40iw_active_open_err(cm_node, true);
2549         }
2550         return err;
2551 }
2552
2553 /**
2554  * i40iw_check_seq - check seq numbers if OK
2555  * @cm_node: connection's node
2556  * @tcph: pointer tcp header
2557  */
2558 static int i40iw_check_seq(struct i40iw_cm_node *cm_node, struct tcphdr *tcph)
2559 {
2560         int err = 0;
2561         u32 seq;
2562         u32 ack_seq;
2563         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
2564         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
2565         u32 rcv_wnd;
2566
2567         seq = ntohl(tcph->seq);
2568         ack_seq = ntohl(tcph->ack_seq);
2569         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
2570         if (ack_seq != loc_seq_num)
2571                 err = -1;
2572         else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
2573                 err = -1;
2574         if (err) {
2575                 i40iw_pr_err("seq number\n");
2576                 i40iw_indicate_pkt_err(cm_node);
2577         }
2578         return err;
2579 }
2580
2581 /**
2582  * i40iw_handle_syn_pkt - is for Passive node
2583  * @cm_node: connection's node
2584  * @rbuf: receive buffer
2585  */
2586 static void i40iw_handle_syn_pkt(struct i40iw_cm_node *cm_node,
2587                                  struct i40iw_puda_buf *rbuf)
2588 {
2589         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2590         int ret;
2591         u32 inc_sequence;
2592         int optionsize;
2593         struct i40iw_cm_info nfo;
2594
2595         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2596         inc_sequence = ntohl(tcph->seq);
2597
2598         switch (cm_node->state) {
2599         case I40IW_CM_STATE_SYN_SENT:
2600         case I40IW_CM_STATE_MPAREQ_SENT:
2601                 /* Rcvd syn on active open connection */
2602                 i40iw_active_open_err(cm_node, 1);
2603                 break;
2604         case I40IW_CM_STATE_LISTENING:
2605                 /* Passive OPEN */
2606                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
2607                     cm_node->listener->backlog) {
2608                         cm_node->cm_core->stats_backlog_drops++;
2609                         i40iw_passive_open_err(cm_node, false);
2610                         break;
2611                 }
2612                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 1);
2613                 if (ret) {
2614                         i40iw_passive_open_err(cm_node, false);
2615                         /* drop pkt */
2616                         break;
2617                 }
2618                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2619                 cm_node->accept_pend = 1;
2620                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
2621
2622                 cm_node->state = I40IW_CM_STATE_SYN_RCVD;
2623                 i40iw_get_addr_info(cm_node, &nfo);
2624                 ret = i40iw_manage_qhash(cm_node->iwdev,
2625                                          &nfo,
2626                                          I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2627                                          I40IW_QHASH_MANAGE_TYPE_ADD,
2628                                          (void *)cm_node,
2629                                          false);
2630                 cm_node->qhash_set = true;
2631                 break;
2632         case I40IW_CM_STATE_CLOSED:
2633                 i40iw_cleanup_retrans_entry(cm_node);
2634                 atomic_inc(&cm_node->ref_count);
2635                 i40iw_send_reset(cm_node);
2636                 break;
2637         case I40IW_CM_STATE_OFFLOADED:
2638         case I40IW_CM_STATE_ESTABLISHED:
2639         case I40IW_CM_STATE_FIN_WAIT1:
2640         case I40IW_CM_STATE_FIN_WAIT2:
2641         case I40IW_CM_STATE_MPAREQ_RCVD:
2642         case I40IW_CM_STATE_LAST_ACK:
2643         case I40IW_CM_STATE_CLOSING:
2644         case I40IW_CM_STATE_UNKNOWN:
2645         default:
2646                 break;
2647         }
2648 }
2649
2650 /**
2651  * i40iw_handle_synack_pkt - Process SYN+ACK packet (active side)
2652  * @cm_node: connection's node
2653  * @rbuf: receive buffer
2654  */
2655 static void i40iw_handle_synack_pkt(struct i40iw_cm_node *cm_node,
2656                                     struct i40iw_puda_buf *rbuf)
2657 {
2658         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2659         int ret;
2660         u32 inc_sequence;
2661         int optionsize;
2662
2663         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2664         inc_sequence = ntohl(tcph->seq);
2665         switch (cm_node->state) {
2666         case I40IW_CM_STATE_SYN_SENT:
2667                 i40iw_cleanup_retrans_entry(cm_node);
2668                 /* active open */
2669                 if (i40iw_check_syn(cm_node, tcph)) {
2670                         i40iw_pr_err("check syn fail\n");
2671                         return;
2672                 }
2673                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2674                 /* setup options */
2675                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 0);
2676                 if (ret) {
2677                         i40iw_debug(cm_node->dev,
2678                                     I40IW_DEBUG_CM,
2679                                     "cm_node=%p tcp_options failed\n",
2680                                     cm_node);
2681                         break;
2682                 }
2683                 i40iw_cleanup_retrans_entry(cm_node);
2684                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2685                 i40iw_send_ack(cm_node);        /* ACK  for the syn_ack */
2686                 ret = i40iw_send_mpa_request(cm_node);
2687                 if (ret) {
2688                         i40iw_debug(cm_node->dev,
2689                                     I40IW_DEBUG_CM,
2690                                     "cm_node=%p i40iw_send_mpa_request failed\n",
2691                                     cm_node);
2692                         break;
2693                 }
2694                 cm_node->state = I40IW_CM_STATE_MPAREQ_SENT;
2695                 break;
2696         case I40IW_CM_STATE_MPAREQ_RCVD:
2697                 i40iw_passive_open_err(cm_node, true);
2698                 break;
2699         case I40IW_CM_STATE_LISTENING:
2700                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2701                 i40iw_cleanup_retrans_entry(cm_node);
2702                 cm_node->state = I40IW_CM_STATE_CLOSED;
2703                 i40iw_send_reset(cm_node);
2704                 break;
2705         case I40IW_CM_STATE_CLOSED:
2706                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2707                 i40iw_cleanup_retrans_entry(cm_node);
2708                 atomic_inc(&cm_node->ref_count);
2709                 i40iw_send_reset(cm_node);
2710                 break;
2711         case I40IW_CM_STATE_ESTABLISHED:
2712         case I40IW_CM_STATE_FIN_WAIT1:
2713         case I40IW_CM_STATE_FIN_WAIT2:
2714         case I40IW_CM_STATE_LAST_ACK:
2715         case I40IW_CM_STATE_OFFLOADED:
2716         case I40IW_CM_STATE_CLOSING:
2717         case I40IW_CM_STATE_UNKNOWN:
2718         case I40IW_CM_STATE_MPAREQ_SENT:
2719         default:
2720                 break;
2721         }
2722 }
2723
2724 /**
2725  * i40iw_handle_ack_pkt - process packet with ACK
2726  * @cm_node: connection's node
2727  * @rbuf: receive buffer
2728  */
2729 static int i40iw_handle_ack_pkt(struct i40iw_cm_node *cm_node,
2730                                 struct i40iw_puda_buf *rbuf)
2731 {
2732         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2733         u32 inc_sequence;
2734         int ret = 0;
2735         int optionsize;
2736         u32 datasize = rbuf->datalen;
2737
2738         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2739
2740         if (i40iw_check_seq(cm_node, tcph))
2741                 return -EINVAL;
2742
2743         inc_sequence = ntohl(tcph->seq);
2744         switch (cm_node->state) {
2745         case I40IW_CM_STATE_SYN_RCVD:
2746                 i40iw_cleanup_retrans_entry(cm_node);
2747                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 1);
2748                 if (ret)
2749                         break;
2750                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2751                 cm_node->state = I40IW_CM_STATE_ESTABLISHED;
2752                 if (datasize) {
2753                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2754                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2755                 }
2756                 break;
2757         case I40IW_CM_STATE_ESTABLISHED:
2758                 i40iw_cleanup_retrans_entry(cm_node);
2759                 if (datasize) {
2760                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2761                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2762                 }
2763                 break;
2764         case I40IW_CM_STATE_MPAREQ_SENT:
2765                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2766                 if (datasize) {
2767                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2768                         cm_node->ack_rcvd = false;
2769                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2770                 } else {
2771                         cm_node->ack_rcvd = true;
2772                 }
2773                 break;
2774         case I40IW_CM_STATE_LISTENING:
2775                 i40iw_cleanup_retrans_entry(cm_node);
2776                 cm_node->state = I40IW_CM_STATE_CLOSED;
2777                 i40iw_send_reset(cm_node);
2778                 break;
2779         case I40IW_CM_STATE_CLOSED:
2780                 i40iw_cleanup_retrans_entry(cm_node);
2781                 atomic_inc(&cm_node->ref_count);
2782                 i40iw_send_reset(cm_node);
2783                 break;
2784         case I40IW_CM_STATE_LAST_ACK:
2785         case I40IW_CM_STATE_CLOSING:
2786                 i40iw_cleanup_retrans_entry(cm_node);
2787                 cm_node->state = I40IW_CM_STATE_CLOSED;
2788                 if (!cm_node->accept_pend)
2789                         cm_node->cm_id->rem_ref(cm_node->cm_id);
2790                 i40iw_rem_ref_cm_node(cm_node);
2791                 break;
2792         case I40IW_CM_STATE_FIN_WAIT1:
2793                 i40iw_cleanup_retrans_entry(cm_node);
2794                 cm_node->state = I40IW_CM_STATE_FIN_WAIT2;
2795                 break;
2796         case I40IW_CM_STATE_SYN_SENT:
2797         case I40IW_CM_STATE_FIN_WAIT2:
2798         case I40IW_CM_STATE_OFFLOADED:
2799         case I40IW_CM_STATE_MPAREQ_RCVD:
2800         case I40IW_CM_STATE_UNKNOWN:
2801         default:
2802                 i40iw_cleanup_retrans_entry(cm_node);
2803                 break;
2804         }
2805         return ret;
2806 }
2807
2808 /**
2809  * i40iw_process_packet - process cm packet
2810  * @cm_node: connection's node
2811  * @rbuf: receive buffer
2812  */
2813 static void i40iw_process_packet(struct i40iw_cm_node *cm_node,
2814                                  struct i40iw_puda_buf *rbuf)
2815 {
2816         enum i40iw_tcpip_pkt_type pkt_type = I40IW_PKT_TYPE_UNKNOWN;
2817         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2818         u32 fin_set = 0;
2819         int ret;
2820
2821         if (tcph->rst) {
2822                 pkt_type = I40IW_PKT_TYPE_RST;
2823         } else if (tcph->syn) {
2824                 pkt_type = I40IW_PKT_TYPE_SYN;
2825                 if (tcph->ack)
2826                         pkt_type = I40IW_PKT_TYPE_SYNACK;
2827         } else if (tcph->ack) {
2828                 pkt_type = I40IW_PKT_TYPE_ACK;
2829         }
2830         if (tcph->fin)
2831                 fin_set = 1;
2832
2833         switch (pkt_type) {
2834         case I40IW_PKT_TYPE_SYN:
2835                 i40iw_handle_syn_pkt(cm_node, rbuf);
2836                 break;
2837         case I40IW_PKT_TYPE_SYNACK:
2838                 i40iw_handle_synack_pkt(cm_node, rbuf);
2839                 break;
2840         case I40IW_PKT_TYPE_ACK:
2841                 ret = i40iw_handle_ack_pkt(cm_node, rbuf);
2842                 if (fin_set && !ret)
2843                         i40iw_handle_fin_pkt(cm_node);
2844                 break;
2845         case I40IW_PKT_TYPE_RST:
2846                 i40iw_handle_rst_pkt(cm_node, rbuf);
2847                 break;
2848         default:
2849                 if (fin_set &&
2850                     (!i40iw_check_seq(cm_node, (struct tcphdr *)rbuf->tcph)))
2851                         i40iw_handle_fin_pkt(cm_node);
2852                 break;
2853         }
2854 }
2855
2856 /**
2857  * i40iw_make_listen_node - create a listen node with params
2858  * @cm_core: cm's core
2859  * @iwdev: iwarp device structure
2860  * @cm_info: quad info for connection
2861  */
2862 static struct i40iw_cm_listener *i40iw_make_listen_node(
2863                                         struct i40iw_cm_core *cm_core,
2864                                         struct i40iw_device *iwdev,
2865                                         struct i40iw_cm_info *cm_info)
2866 {
2867         struct i40iw_cm_listener *listener;
2868         unsigned long flags;
2869
2870         /* cannot have multiple matching listeners */
2871         listener = i40iw_find_listener(cm_core, cm_info->loc_addr,
2872                                        cm_info->loc_port,
2873                                        cm_info->vlan_id,
2874                                        I40IW_CM_LISTENER_EITHER_STATE);
2875         if (listener &&
2876             (listener->listener_state == I40IW_CM_LISTENER_ACTIVE_STATE)) {
2877                 atomic_dec(&listener->ref_count);
2878                 i40iw_debug(cm_core->dev,
2879                             I40IW_DEBUG_CM,
2880                             "Not creating listener since it already exists\n");
2881                 return NULL;
2882         }
2883
2884         if (!listener) {
2885                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2886                 listener = kzalloc(sizeof(*listener), GFP_KERNEL);
2887                 if (!listener)
2888                         return NULL;
2889                 cm_core->stats_listen_nodes_created++;
2890                 memcpy(listener->loc_addr, cm_info->loc_addr, sizeof(listener->loc_addr));
2891                 listener->loc_port = cm_info->loc_port;
2892
2893                 INIT_LIST_HEAD(&listener->child_listen_list);
2894
2895                 atomic_set(&listener->ref_count, 1);
2896         } else {
2897                 listener->reused_node = 1;
2898         }
2899
2900         listener->cm_id = cm_info->cm_id;
2901         listener->ipv4 = cm_info->ipv4;
2902         listener->vlan_id = cm_info->vlan_id;
2903         atomic_set(&listener->pend_accepts_cnt, 0);
2904         listener->cm_core = cm_core;
2905         listener->iwdev = iwdev;
2906
2907         listener->backlog = cm_info->backlog;
2908         listener->listener_state = I40IW_CM_LISTENER_ACTIVE_STATE;
2909
2910         if (!listener->reused_node) {
2911                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2912                 list_add(&listener->list, &cm_core->listen_nodes);
2913                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2914         }
2915
2916         return listener;
2917 }
2918
2919 /**
2920  * i40iw_create_cm_node - make a connection node with params
2921  * @cm_core: cm's core
2922  * @iwdev: iwarp device structure
2923  * @conn_param: upper layer connection parameters
2924  * @cm_info: quad info for connection
2925  */
2926 static struct i40iw_cm_node *i40iw_create_cm_node(
2927                                         struct i40iw_cm_core *cm_core,
2928                                         struct i40iw_device *iwdev,
2929                                         struct iw_cm_conn_param *conn_param,
2930                                         struct i40iw_cm_info *cm_info)
2931 {
2932         struct i40iw_cm_node *cm_node;
2933         struct i40iw_cm_listener *loopback_remotelistener;
2934         struct i40iw_cm_node *loopback_remotenode;
2935         struct i40iw_cm_info loopback_cm_info;
2936
2937         u16 private_data_len = conn_param->private_data_len;
2938         const void *private_data = conn_param->private_data;