drivers/target/iscsi/cxgbit/cxgbit_cm.c

   1 /*
   2  * Copyright (c) 2016 Chelsio Communications, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/list.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/timer.h>
  14 #include <linux/notifier.h>
  15 #include <linux/inetdevice.h>
  16 #include <linux/ip.h>
  17 #include <linux/tcp.h>
  18 #include <linux/if_vlan.h>
  19
  20 #include <net/neighbour.h>
  21 #include <net/netevent.h>
  22 #include <net/route.h>
  23 #include <net/tcp.h>
  24 #include <net/ip6_route.h>
  25 #include <net/addrconf.h>
  26
  27 #include <libcxgb_cm.h>
  28 #include "cxgbit.h"
  29 #include "clip_tbl.h"
  30
  31 static void cxgbit_init_wr_wait(struct cxgbit_wr_wait *wr_waitp)
  32 {
  33         wr_waitp->ret = 0;
  34         reinit_completion(&wr_waitp->completion);
  35 }
  36
  37 static void
  38 cxgbit_wake_up(struct cxgbit_wr_wait *wr_waitp, const char *func, u8 ret)
  39 {
  40         if (ret == CPL_ERR_NONE)
  41                 wr_waitp->ret = 0;
  42         else
  43                 wr_waitp->ret = -EIO;
  44
  45         if (wr_waitp->ret)
  46                 pr_err("%s: err:%u", func, ret);
  47
  48         complete(&wr_waitp->completion);
  49 }
  50
  51 static int
  52 cxgbit_wait_for_reply(struct cxgbit_device *cdev,
  53                       struct cxgbit_wr_wait *wr_waitp, u32 tid, u32 timeout,
  54                       const char *func)
  55 {
  56         int ret;
  57
  58         if (!test_bit(CDEV_STATE_UP, &cdev->flags)) {
  59                 wr_waitp->ret = -EIO;
  60                 goto out;
  61         }
  62
  63         ret = wait_for_completion_timeout(&wr_waitp->completion, timeout * HZ);
  64         if (!ret) {
  65                 pr_info("%s - Device %s not responding tid %u\n",
  66                         func, pci_name(cdev->lldi.pdev), tid);
  67                 wr_waitp->ret = -ETIMEDOUT;
  68         }
  69 out:
  70         if (wr_waitp->ret)
  71                 pr_info("%s: FW reply %d tid %u\n",
  72                         pci_name(cdev->lldi.pdev), wr_waitp->ret, tid);
  73         return wr_waitp->ret;
  74 }
  75
  76 static int cxgbit_np_hashfn(const struct cxgbit_np *cnp)
  77 {
  78         return ((unsigned long)cnp >> 10) & (NP_INFO_HASH_SIZE - 1);
  79 }
  80
  81 static struct np_info *
  82 cxgbit_np_hash_add(struct cxgbit_device *cdev, struct cxgbit_np *cnp,
  83                    unsigned int stid)
  84 {
  85         struct np_info *p = kzalloc(sizeof(*p), GFP_KERNEL);
  86
  87         if (p) {
  88                 int bucket = cxgbit_np_hashfn(cnp);
  89
  90                 p->cnp = cnp;
  91                 p->stid = stid;
  92                 spin_lock(&cdev->np_lock);
  93                 p->next = cdev->np_hash_tab[bucket];
  94                 cdev->np_hash_tab[bucket] = p;
  95                 spin_unlock(&cdev->np_lock);
  96         }
  97
  98         return p;
  99 }
 100
 101 static int
 102 cxgbit_np_hash_find(struct cxgbit_device *cdev, struct cxgbit_np *cnp)
 103 {
 104         int stid = -1, bucket = cxgbit_np_hashfn(cnp);
 105         struct np_info *p;
 106
 107         spin_lock(&cdev->np_lock);
 108         for (p = cdev->np_hash_tab[bucket]; p; p = p->next) {
 109                 if (p->cnp == cnp) {
 110                         stid = p->stid;
 111                         break;
 112                 }
 113         }
 114         spin_unlock(&cdev->np_lock);
 115
 116         return stid;
 117 }
 118
 119 static int cxgbit_np_hash_del(struct cxgbit_device *cdev, struct cxgbit_np *cnp)
 120 {
 121         int stid = -1, bucket = cxgbit_np_hashfn(cnp);
 122         struct np_info *p, **prev = &cdev->np_hash_tab[bucket];
 123
 124         spin_lock(&cdev->np_lock);
 125         for (p = *prev; p; prev = &p->next, p = p->next) {
 126                 if (p->cnp == cnp) {
 127                         stid = p->stid;
 128                         *prev = p->next;
 129                         kfree(p);
 130                         break;
 131                 }
 132         }
 133         spin_unlock(&cdev->np_lock);
 134
 135         return stid;
 136 }
 137
 138 void _cxgbit_free_cnp(struct kref *kref)
 139 {
 140         struct cxgbit_np *cnp;
 141
 142         cnp = container_of(kref, struct cxgbit_np, kref);
 143         kfree(cnp);
 144 }
 145
 146 static int
 147 cxgbit_create_server6(struct cxgbit_device *cdev, unsigned int stid,
 148                       struct cxgbit_np *cnp)
 149 {
 150         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
 151                                      &cnp->com.local_addr;
 152         int addr_type;
 153         int ret;
 154
 155         pr_debug("%s: dev = %s; stid = %u; sin6_port = %u\n",
 156                  __func__, cdev->lldi.ports[0]->name, stid, sin6->sin6_port);
 157
 158         addr_type = ipv6_addr_type((const struct in6_addr *)
 159                                    &sin6->sin6_addr);
 160         if (addr_type != IPV6_ADDR_ANY) {
 161                 ret = cxgb4_clip_get(cdev->lldi.ports[0],
 162                                      (const u32 *)&sin6->sin6_addr.s6_addr, 1);
 163                 if (ret) {
 164                         pr_err("Unable to find clip table entry. laddr %pI6. Error:%d.\n",
 165                                sin6->sin6_addr.s6_addr, ret);
 166                         return -ENOMEM;
 167                 }
 168         }
 169
 170         cxgbit_get_cnp(cnp);
 171         cxgbit_init_wr_wait(&cnp->com.wr_wait);
 172
 173         ret = cxgb4_create_server6(cdev->lldi.ports[0],
 174                                    stid, &sin6->sin6_addr,
 175                                    sin6->sin6_port,
 176                                    cdev->lldi.rxq_ids[0]);
 177         if (!ret)
 178                 ret = cxgbit_wait_for_reply(cdev, &cnp->com.wr_wait,
 179                                             0, 10, __func__);
 180         else if (ret > 0)
 181                 ret = net_xmit_errno(ret);
 182         else
 183                 cxgbit_put_cnp(cnp);
 184
 185         if (ret) {
 186                 if (ret != -ETIMEDOUT)
 187                         cxgb4_clip_release(cdev->lldi.ports[0],
 188                                    (const u32 *)&sin6->sin6_addr.s6_addr, 1);
 189
 190                 pr_err("create server6 err %d stid %d laddr %pI6 lport %d\n",
 191                        ret, stid, sin6->sin6_addr.s6_addr,
 192                        ntohs(sin6->sin6_port));
 193         }
 194
 195         return ret;
 196 }
 197
 198 static int
 199 cxgbit_create_server4(struct cxgbit_device *cdev, unsigned int stid,
 200                       struct cxgbit_np *cnp)
 201 {
 202         struct sockaddr_in *sin = (struct sockaddr_in *)
 203                                    &cnp->com.local_addr;
 204         int ret;
 205
 206         pr_debug("%s: dev = %s; stid = %u; sin_port = %u\n",
 207                  __func__, cdev->lldi.ports[0]->name, stid, sin->sin_port);
 208
 209         cxgbit_get_cnp(cnp);
 210         cxgbit_init_wr_wait(&cnp->com.wr_wait);
 211
 212         ret = cxgb4_create_server(cdev->lldi.ports[0],
 213                                   stid, sin->sin_addr.s_addr,
 214                                   sin->sin_port, 0,
 215                                   cdev->lldi.rxq_ids[0]);
 216         if (!ret)
 217                 ret = cxgbit_wait_for_reply(cdev,
 218                                             &cnp->com.wr_wait,
 219                                             0, 10, __func__);
 220         else if (ret > 0)
 221                 ret = net_xmit_errno(ret);
 222         else
 223                 cxgbit_put_cnp(cnp);
 224
 225         if (ret)
 226                 pr_err("create server failed err %d stid %d laddr %pI4 lport %d\n",
 227                        ret, stid, &sin->sin_addr, ntohs(sin->sin_port));
 228         return ret;
 229 }
 230
 231 struct cxgbit_device *cxgbit_find_device(struct net_device *ndev, u8 *port_id)
 232 {
 233         struct cxgbit_device *cdev;
 234         u8 i;
 235
 236         list_for_each_entry(cdev, &cdev_list_head, list) {
 237                 struct cxgb4_lld_info *lldi = &cdev->lldi;
 238
 239                 for (i = 0; i < lldi->nports; i++) {
 240                         if (lldi->ports[i] == ndev) {
 241                                 if (port_id)
 242                                         *port_id = i;
 243                                 return cdev;
 244                         }
 245                 }
 246         }
 247
 248         return NULL;
 249 }
 250
 251 static struct net_device *cxgbit_get_real_dev(struct net_device *ndev)
 252 {
 253         if (ndev->priv_flags & IFF_BONDING) {
 254                 pr_err("Bond devices are not supported. Interface:%s\n",
 255                        ndev->name);
 256                 return NULL;
 257         }
 258
 259         if (is_vlan_dev(ndev))
 260                 return vlan_dev_real_dev(ndev);
 261
 262         return ndev;
 263 }
 264
 265 static struct net_device *cxgbit_ipv4_netdev(__be32 saddr)
 266 {
 267         struct net_device *ndev;
 268
 269         ndev = __ip_dev_find(&init_net, saddr, false);
 270         if (!ndev)
 271                 return NULL;
 272
 273         return cxgbit_get_real_dev(ndev);
 274 }
 275
 276 static struct net_device *cxgbit_ipv6_netdev(struct in6_addr *addr6)
 277 {
 278         struct net_device *ndev = NULL;
 279         bool found = false;
 280
 281         if (IS_ENABLED(CONFIG_IPV6)) {
 282                 for_each_netdev_rcu(&init_net, ndev)
 283                         if (ipv6_chk_addr(&init_net, addr6, ndev, 1)) {
 284                                 found = true;
 285                                 break;
 286                         }
 287         }
 288         if (!found)
 289                 return NULL;
 290         return cxgbit_get_real_dev(ndev);
 291 }
 292
 293 static struct cxgbit_device *cxgbit_find_np_cdev(struct cxgbit_np *cnp)
 294 {
 295         struct sockaddr_storage *sockaddr = &cnp->com.local_addr;
 296         int ss_family = sockaddr->ss_family;
 297         struct net_device *ndev = NULL;
 298         struct cxgbit_device *cdev = NULL;
 299
 300         rcu_read_lock();
 301         if (ss_family == AF_INET) {
 302                 struct sockaddr_in *sin;
 303
 304                 sin = (struct sockaddr_in *)sockaddr;
 305                 ndev = cxgbit_ipv4_netdev(sin->sin_addr.s_addr);
 306         } else if (ss_family == AF_INET6) {
 307                 struct sockaddr_in6 *sin6;
 308
 309                 sin6 = (struct sockaddr_in6 *)sockaddr;
 310                 ndev = cxgbit_ipv6_netdev(&sin6->sin6_addr);
 311         }
 312         if (!ndev)
 313                 goto out;
 314
 315         cdev = cxgbit_find_device(ndev, NULL);
 316 out:
 317         rcu_read_unlock();
 318         return cdev;
 319 }
 320
 321 static bool cxgbit_inaddr_any(struct cxgbit_np *cnp)
 322 {
 323         struct sockaddr_storage *sockaddr = &cnp->com.local_addr;
 324         int ss_family = sockaddr->ss_family;
 325         int addr_type;
 326
 327         if (ss_family == AF_INET) {
 328                 struct sockaddr_in *sin;
 329
 330                 sin = (struct sockaddr_in *)sockaddr;
 331                 if (sin->sin_addr.s_addr == htonl(INADDR_ANY))
 332                         return true;
 333         } else if (ss_family == AF_INET6) {
 334                 struct sockaddr_in6 *sin6;
 335
 336                 sin6 = (struct sockaddr_in6 *)sockaddr;
 337                 addr_type = ipv6_addr_type((const struct in6_addr *)
 338                                 &sin6->sin6_addr);
 339                 if (addr_type == IPV6_ADDR_ANY)
 340                         return true;
 341         }
 342         return false;
 343 }
 344
 345 static int
 346 __cxgbit_setup_cdev_np(struct cxgbit_device *cdev, struct cxgbit_np *cnp)
 347 {
 348         int stid, ret;
 349         int ss_family = cnp->com.local_addr.ss_family;
 350
 351         if (!test_bit(CDEV_STATE_UP, &cdev->flags))
 352                 return -EINVAL;
 353
 354         stid = cxgb4_alloc_stid(cdev->lldi.tids, ss_family, cnp);
 355         if (stid < 0)
 356                 return -EINVAL;
 357
 358         if (!cxgbit_np_hash_add(cdev, cnp, stid)) {
 359                 cxgb4_free_stid(cdev->lldi.tids, stid, ss_family);
 360                 return -EINVAL;
 361         }
 362
 363         if (ss_family == AF_INET)
 364                 ret = cxgbit_create_server4(cdev, stid, cnp);
 365         else
 366                 ret = cxgbit_create_server6(cdev, stid, cnp);
 367
 368         if (ret) {
 369                 if (ret != -ETIMEDOUT)
 370                         cxgb4_free_stid(cdev->lldi.tids, stid,
 371                                         ss_family);
 372                 cxgbit_np_hash_del(cdev, cnp);
 373                 return ret;
 374         }
 375         return ret;
 376 }
 377
 378 static int cxgbit_setup_cdev_np(struct cxgbit_np *cnp)
 379 {
 380         struct cxgbit_device *cdev;
 381         int ret = -1;
 382
 383         mutex_lock(&cdev_list_lock);
 384         cdev = cxgbit_find_np_cdev(cnp);
 385         if (!cdev)
 386                 goto out;
 387
 388         if (cxgbit_np_hash_find(cdev, cnp) >= 0)
 389                 goto out;
 390
 391         if (__cxgbit_setup_cdev_np(cdev, cnp))
 392                 goto out;
 393
 394         cnp->com.cdev = cdev;
 395         ret = 0;
 396 out:
 397         mutex_unlock(&cdev_list_lock);
 398         return ret;
 399 }
 400
 401 static int cxgbit_setup_all_np(struct cxgbit_np *cnp)
 402 {
 403         struct cxgbit_device *cdev;
 404         int ret;
 405         u32 count = 0;
 406
 407         mutex_lock(&cdev_list_lock);
 408         list_for_each_entry(cdev, &cdev_list_head, list) {
 409                 if (cxgbit_np_hash_find(cdev, cnp) >= 0) {
 410                         mutex_unlock(&cdev_list_lock);
 411                         return -1;
 412                 }
 413         }
 414
 415         list_for_each_entry(cdev, &cdev_list_head, list) {
 416                 ret = __cxgbit_setup_cdev_np(cdev, cnp);
 417                 if (ret == -ETIMEDOUT)
 418                         break;
 419                 if (ret != 0)
 420                         continue;
 421                 count++;
 422         }
 423         mutex_unlock(&cdev_list_lock);
 424
 425         return count ? 0 : -1;
 426 }
 427
 428 int cxgbit_setup_np(struct iscsi_np *np, struct sockaddr_storage *ksockaddr)
 429 {
 430         struct cxgbit_np *cnp;
 431         int ret;
 432
 433         if ((ksockaddr->ss_family != AF_INET) &&
 434             (ksockaddr->ss_family != AF_INET6))
 435                 return -EINVAL;
 436
 437         cnp = kzalloc(sizeof(*cnp), GFP_KERNEL);
 438         if (!cnp)
 439                 return -ENOMEM;
 440
 441         init_waitqueue_head(&cnp->accept_wait);
 442         init_completion(&cnp->com.wr_wait.completion);
 443         init_completion(&cnp->accept_comp);
 444         INIT_LIST_HEAD(&cnp->np_accept_list);
 445         spin_lock_init(&cnp->np_accept_lock);
 446         kref_init(&cnp->kref);
 447         memcpy(&np->np_sockaddr, ksockaddr,
 448                sizeof(struct sockaddr_storage));
 449         memcpy(&cnp->com.local_addr, &np->np_sockaddr,
 450                sizeof(cnp->com.local_addr));
 451
 452         cnp->np = np;
 453         cnp->com.cdev = NULL;
 454
 455         if (cxgbit_inaddr_any(cnp))
 456                 ret = cxgbit_setup_all_np(cnp);
 457         else
 458                 ret = cxgbit_setup_cdev_np(cnp);
 459
 460         if (ret) {
 461                 cxgbit_put_cnp(cnp);
 462                 return -EINVAL;
 463         }
 464
 465         np->np_context = cnp;
 466         cnp->com.state = CSK_STATE_LISTEN;
 467         return 0;
 468 }
 469
 470 static void
 471 cxgbit_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
 472                      struct cxgbit_sock *csk)
 473 {
 474         conn->login_family = np->np_sockaddr.ss_family;
 475         conn->login_sockaddr = csk->com.remote_addr;
 476         conn->local_sockaddr = csk->com.local_addr;
 477 }
 478
 479 int cxgbit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 480 {
 481         struct cxgbit_np *cnp = np->np_context;
 482         struct cxgbit_sock *csk;
 483         int ret = 0;
 484
 485 accept_wait:
 486         ret = wait_for_completion_interruptible(&cnp->accept_comp);
 487         if (ret)
 488                 return -ENODEV;
 489
 490         spin_lock_bh(&np->np_thread_lock);
 491         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
 492                 spin_unlock_bh(&np->np_thread_lock);
 493                 /**
 494                  * No point in stalling here when np_thread
 495                  * is in state RESET/SHUTDOWN/EXIT - bail
 496                  **/
 497                 return -ENODEV;
 498         }
 499         spin_unlock_bh(&np->np_thread_lock);
 500
 501         spin_lock_bh(&cnp->np_accept_lock);
 502         if (list_empty(&cnp->np_accept_list)) {
 503                 spin_unlock_bh(&cnp->np_accept_lock);
 504                 goto accept_wait;
 505         }
 506
 507         csk = list_first_entry(&cnp->np_accept_list,
 508                                struct cxgbit_sock,
 509                                accept_node);
 510
 511         list_del_init(&csk->accept_node);
 512         spin_unlock_bh(&cnp->np_accept_lock);
 513         conn->context = csk;
 514         csk->conn = conn;
 515
 516         cxgbit_set_conn_info(np, conn, csk);
 517         return 0;
 518 }
 519
 520 static int
 521 __cxgbit_free_cdev_np(struct cxgbit_device *cdev, struct cxgbit_np *cnp)
 522 {
 523         int stid, ret;
 524         bool ipv6 = false;
 525
 526         stid = cxgbit_np_hash_del(cdev, cnp);
 527         if (stid < 0)
 528                 return -EINVAL;
 529         if (!test_bit(CDEV_STATE_UP, &cdev->flags))
 530                 return -EINVAL;
 531
 532         if (cnp->np->np_sockaddr.ss_family == AF_INET6)
 533                 ipv6 = true;
 534
 535         cxgbit_get_cnp(cnp);
 536         cxgbit_init_wr_wait(&cnp->com.wr_wait);
 537         ret = cxgb4_remove_server(cdev->lldi.ports[0], stid,
 538                                   cdev->lldi.rxq_ids[0], ipv6);
 539
 540         if (ret > 0)
 541                 ret = net_xmit_errno(ret);
 542
 543         if (ret) {
 544                 cxgbit_put_cnp(cnp);
 545                 return ret;
 546         }
 547
 548         ret = cxgbit_wait_for_reply(cdev, &cnp->com.wr_wait,
 549                                     0, 10, __func__);
 550         if (ret == -ETIMEDOUT)
 551                 return ret;
 552
 553         if (ipv6 && cnp->com.cdev) {
 554                 struct sockaddr_in6 *sin6;
 555
 556                 sin6 = (struct sockaddr_in6 *)&cnp->com.local_addr;
 557                 cxgb4_clip_release(cdev->lldi.ports[0],
 558                                    (const u32 *)&sin6->sin6_addr.s6_addr,
 559                                    1);
 560         }
 561
 562         cxgb4_free_stid(cdev->lldi.tids, stid,
 563                         cnp->com.local_addr.ss_family);
 564         return 0;
 565 }
 566
 567 static void cxgbit_free_all_np(struct cxgbit_np *cnp)
 568 {
 569         struct cxgbit_device *cdev;
 570         int ret;
 571
 572         mutex_lock(&cdev_list_lock);
 573         list_for_each_entry(cdev, &cdev_list_head, list) {
 574                 ret = __cxgbit_free_cdev_np(cdev, cnp);
 575                 if (ret == -ETIMEDOUT)
 576                         break;
 577         }
 578         mutex_unlock(&cdev_list_lock);
 579 }
 580
 581 static void cxgbit_free_cdev_np(struct cxgbit_np *cnp)
 582 {
 583         struct cxgbit_device *cdev;
 584         bool found = false;
 585
 586         mutex_lock(&cdev_list_lock);
 587         list_for_each_entry(cdev, &cdev_list_head, list) {
 588                 if (cdev == cnp->com.cdev) {
 589                         found = true;
 590                         break;
 591                 }
 592         }
 593         if (!found)
 594                 goto out;
 595
 596         __cxgbit_free_cdev_np(cdev, cnp);
 597 out:
 598         mutex_unlock(&cdev_list_lock);
 599 }
 600
 601 void cxgbit_free_np(struct iscsi_np *np)
 602 {
 603         struct cxgbit_np *cnp = np->np_context;
 604
 605         cnp->com.state = CSK_STATE_DEAD;
 606         if (cnp->com.cdev)
 607                 cxgbit_free_cdev_np(cnp);
 608         else
 609                 cxgbit_free_all_np(cnp);
 610
 611         np->np_context = NULL;
 612         cxgbit_put_cnp(cnp);
 613 }
 614
 615 static void cxgbit_send_halfclose(struct cxgbit_sock *csk)
 616 {
 617         struct sk_buff *skb;
 618         u32 len = roundup(sizeof(struct cpl_close_con_req), 16);
 619
 620         skb = alloc_skb(len, GFP_ATOMIC);
 621         if (!skb)
 622                 return;
 623
 624         cxgb_mk_close_con_req(skb, len, csk->tid, csk->txq_idx,
 625                               NULL, NULL);
 626
 627         cxgbit_skcb_flags(skb) |= SKCBF_TX_FLAG_COMPL;
 628         __skb_queue_tail(&csk->txq, skb);
 629         cxgbit_push_tx_frames(csk);
 630 }
 631
 632 static void cxgbit_arp_failure_discard(void *handle, struct sk_buff *skb)
 633 {
 634         pr_debug("%s cxgbit_device %p\n", __func__, handle);
 635         kfree_skb(skb);
 636 }
 637
 638 static void cxgbit_abort_arp_failure(void *handle, struct sk_buff *skb)
 639 {
 640         struct cxgbit_device *cdev = handle;
 641         struct cpl_abort_req *req = cplhdr(skb);
 642
 643         pr_debug("%s cdev %p\n", __func__, cdev);
 644         req->cmd = CPL_ABORT_NO_RST;
 645         cxgbit_ofld_send(cdev, skb);
 646 }
 647
 648 static int cxgbit_send_abort_req(struct cxgbit_sock *csk)
 649 {
 650         struct sk_buff *skb;
 651         u32 len = roundup(sizeof(struct cpl_abort_req), 16);
 652
 653         pr_debug("%s: csk %p tid %u; state %d\n",
 654                  __func__, csk, csk->tid, csk->com.state);
 655
 656         __skb_queue_purge(&csk->txq);
 657
 658         if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags))
 659                 cxgbit_send_tx_flowc_wr(csk);
 660
 661         skb = __skb_dequeue(&csk->skbq);
 662         cxgb_mk_abort_req(skb, len, csk->tid, csk->txq_idx,
 663                           csk->com.cdev, cxgbit_abort_arp_failure);
 664
 665         return cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
 666 }
 667
 668 static void
 669 __cxgbit_abort_conn(struct cxgbit_sock *csk, struct sk_buff *skb)
 670 {
 671         __kfree_skb(skb);
 672
 673         if (csk->com.state != CSK_STATE_ESTABLISHED)
 674                 goto no_abort;
 675
 676         set_bit(CSK_ABORT_RPL_WAIT, &csk->com.flags);
 677         csk->com.state = CSK_STATE_ABORTING;
 678
 679         cxgbit_send_abort_req(csk);
 680
 681         return;
 682
 683 no_abort:
 684         cxgbit_wake_up(&csk->com.wr_wait, __func__, CPL_ERR_NONE);
 685         cxgbit_put_csk(csk);
 686 }
 687
 688 void cxgbit_abort_conn(struct cxgbit_sock *csk)
 689 {
 690         struct sk_buff *skb = alloc_skb(0, GFP_KERNEL | __GFP_NOFAIL);
 691
 692         cxgbit_get_csk(csk);
 693         cxgbit_init_wr_wait(&csk->com.wr_wait);
 694
 695         spin_lock_bh(&csk->lock);
 696         if (csk->lock_owner) {
 697                 cxgbit_skcb_rx_backlog_fn(skb) = __cxgbit_abort_conn;
 698                 __skb_queue_tail(&csk->backlogq, skb);
 699         } else {
 700                 __cxgbit_abort_conn(csk, skb);
 701         }
 702         spin_unlock_bh(&csk->lock);
 703
 704         cxgbit_wait_for_reply(csk->com.cdev, &csk->com.wr_wait,
 705                               csk->tid, 600, __func__);
 706 }
 707
 708 void cxgbit_free_conn(struct iscsi_conn *conn)
 709 {
 710         struct cxgbit_sock *csk = conn->context;
 711         bool release = false;
 712
 713         pr_debug("%s: state %d\n",
 714                  __func__, csk->com.state);
 715
 716         spin_lock_bh(&csk->lock);
 717         switch (csk->com.state) {
 718         case CSK_STATE_ESTABLISHED:
 719                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
 720                         csk->com.state = CSK_STATE_CLOSING;
 721                         cxgbit_send_halfclose(csk);
 722                 } else {
 723                         csk->com.state = CSK_STATE_ABORTING;
 724                         cxgbit_send_abort_req(csk);
 725                 }
 726                 break;
 727         case CSK_STATE_CLOSING:
 728                 csk->com.state = CSK_STATE_MORIBUND;
 729                 cxgbit_send_halfclose(csk);
 730                 break;
 731         case CSK_STATE_DEAD:
 732                 release = true;
 733                 break;
 734         default:
 735                 pr_err("%s: csk %p; state %d\n",
 736                        __func__, csk, csk->com.state);
 737         }
 738         spin_unlock_bh(&csk->lock);
 739
 740         if (release)
 741                 cxgbit_put_csk(csk);
 742 }
 743
 744 static void cxgbit_set_emss(struct cxgbit_sock *csk, u16 opt)
 745 {
 746         csk->emss = csk->com.cdev->lldi.mtus[TCPOPT_MSS_G(opt)] -
 747                         ((csk->com.remote_addr.ss_family == AF_INET) ?
 748                         sizeof(struct iphdr) : sizeof(struct ipv6hdr)) -
 749                         sizeof(struct tcphdr);
 750         csk->mss = csk->emss;
 751         if (TCPOPT_TSTAMP_G(opt))
 752                 csk->emss -= round_up(TCPOLEN_TIMESTAMP, 4);
 753         if (csk->emss < 128)
 754                 csk->emss = 128;
 755         if (csk->emss & 7)
 756                 pr_info("Warning: misaligned mtu idx %u mss %u emss=%u\n",
 757                         TCPOPT_MSS_G(opt), csk->mss, csk->emss);
 758         pr_debug("%s mss_idx %u mss %u emss=%u\n", __func__, TCPOPT_MSS_G(opt),
 759                  csk->mss, csk->emss);
 760 }
 761
 762 static void cxgbit_free_skb(struct cxgbit_sock *csk)
 763 {
 764         struct sk_buff *skb;
 765
 766         __skb_queue_purge(&csk->txq);
 767         __skb_queue_purge(&csk->rxq);
 768         __skb_queue_purge(&csk->backlogq);
 769         __skb_queue_purge(&csk->ppodq);
 770         __skb_queue_purge(&csk->skbq);
 771
 772         while ((skb = cxgbit_sock_dequeue_wr(csk)))
 773                 kfree_skb(skb);
 774
 775         __kfree_skb(csk->lro_hskb);
 776 }
 777
 778 void _cxgbit_free_csk(struct kref *kref)
 779 {
 780         struct cxgbit_sock *csk;
 781         struct cxgbit_device *cdev;
 782
 783         csk = container_of(kref, struct cxgbit_sock, kref);
 784
 785         pr_debug("%s csk %p state %d\n", __func__, csk, csk->com.state);
 786
 787         if (csk->com.local_addr.ss_family == AF_INET6) {
 788                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
 789                                              &csk->com.local_addr;
 790                 cxgb4_clip_release(csk->com.cdev->lldi.ports[0],
 791                                    (const u32 *)
 792                                    &sin6->sin6_addr.s6_addr, 1);
 793         }
 794
 795         cxgb4_remove_tid(csk->com.cdev->lldi.tids, 0, csk->tid,
 796                          csk->com.local_addr.ss_family);
 797         dst_release(csk->dst);
 798         cxgb4_l2t_release(csk->l2t);
 799
 800         cdev = csk->com.cdev;
 801         spin_lock_bh(&cdev->cskq.lock);
 802         list_del(&csk->list);
 803         spin_unlock_bh(&cdev->cskq.lock);
 804
 805         cxgbit_free_skb(csk);
 806         cxgbit_put_cdev(cdev);
 807
 808         kfree(csk);
 809 }
 810
 811 static void cxgbit_set_tcp_window(struct cxgbit_sock *csk, struct port_info *pi)
 812 {
 813         unsigned int linkspeed;
 814         u8 scale;
 815
 816         linkspeed = pi->link_cfg.speed;
 817         scale = linkspeed / SPEED_10000;
 818
 819 #define CXGBIT_10G_RCV_WIN (256 * 1024)
 820         csk->rcv_win = CXGBIT_10G_RCV_WIN;
 821         if (scale)
 822                 csk->rcv_win *= scale;
 823
 824 #define CXGBIT_10G_SND_WIN (256 * 1024)
 825         csk->snd_win = CXGBIT_10G_SND_WIN;
 826         if (scale)
 827                 csk->snd_win *= scale;
 828
 829         pr_debug("%s snd_win %d rcv_win %d\n",
 830                  __func__, csk->snd_win, csk->rcv_win);
 831 }
 832
 833 #ifdef CONFIG_CHELSIO_T4_DCB
 834 static u8 cxgbit_get_iscsi_dcb_state(struct net_device *ndev)
 835 {
 836         return ndev->dcbnl_ops->getstate(ndev);
 837 }
 838
 839 static int cxgbit_select_priority(int pri_mask)
 840 {
 841         if (!pri_mask)
 842                 return 0;
 843
 844         return (ffs(pri_mask) - 1);
 845 }
 846
 847 static u8 cxgbit_get_iscsi_dcb_priority(struct net_device *ndev, u16 local_port)
 848 {
 849         int ret;
 850         u8 caps;
 851
 852         struct dcb_app iscsi_dcb_app = {
 853                 .protocol = local_port
 854         };
 855
 856         ret = (int)ndev->dcbnl_ops->getcap(ndev, DCB_CAP_ATTR_DCBX, &caps);
 857
 858         if (ret)
 859                 return 0;
 860
 861         if (caps & DCB_CAP_DCBX_VER_IEEE) {
 862                 iscsi_dcb_app.selector = IEEE_8021QAZ_APP_SEL_ANY;
 863
 864                 ret = dcb_ieee_getapp_mask(ndev, &iscsi_dcb_app);
 865
 866         } else if (caps & DCB_CAP_DCBX_VER_CEE) {
 867                 iscsi_dcb_app.selector = DCB_APP_IDTYPE_PORTNUM;
 868
 869                 ret = dcb_getapp(ndev, &iscsi_dcb_app);
 870         }
 871
 872         pr_info("iSCSI priority is set to %u\n", cxgbit_select_priority(ret));
 873
 874         return cxgbit_select_priority(ret);
 875 }
 876 #endif
 877
 878 static int
 879 cxgbit_offload_init(struct cxgbit_sock *csk, int iptype, __u8 *peer_ip,
 880                     u16 local_port, struct dst_entry *dst,
 881                     struct cxgbit_device *cdev)
 882 {
 883         struct neighbour *n;
 884         int ret, step;
 885         struct net_device *ndev;
 886         u16 rxq_idx, port_id;
 887 #ifdef CONFIG_CHELSIO_T4_DCB
 888         u8 priority = 0;
 889 #endif
 890
 891         n = dst_neigh_lookup(dst, peer_ip);
 892         if (!n)
 893                 return -ENODEV;
 894
 895         rcu_read_lock();
 896         if (!(n->nud_state & NUD_VALID))
 897                 neigh_event_send(n, NULL);
 898
 899         ret = -ENOMEM;
 900         if (n->dev->flags & IFF_LOOPBACK) {
 901                 if (iptype == 4)
 902                         ndev = cxgbit_ipv4_netdev(*(__be32 *)peer_ip);
 903                 else if (IS_ENABLED(CONFIG_IPV6))
 904                         ndev = cxgbit_ipv6_netdev((struct in6_addr *)peer_ip);
 905                 else
 906                         ndev = NULL;
 907
 908                 if (!ndev) {
 909                         ret = -ENODEV;
 910                         goto out;
 911                 }
 912
 913                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t,
 914                                          n, ndev, 0);
 915                 if (!csk->l2t)
 916                         goto out;
 917                 csk->mtu = ndev->mtu;
 918                 csk->tx_chan = cxgb4_port_chan(ndev);
 919                 csk->smac_idx = cxgb4_tp_smt_idx(cdev->lldi.adapter_type,
 920                                                  cxgb4_port_viid(ndev));
 921                 step = cdev->lldi.ntxq /
 922                         cdev->lldi.nchan;
 923                 csk->txq_idx = cxgb4_port_idx(ndev) * step;
 924                 step = cdev->lldi.nrxq /
 925                         cdev->lldi.nchan;
 926                 csk->ctrlq_idx = cxgb4_port_idx(ndev);
 927                 csk->rss_qid = cdev->lldi.rxq_ids[
 928                                 cxgb4_port_idx(ndev) * step];
 929                 csk->port_id = cxgb4_port_idx(ndev);
 930                 cxgbit_set_tcp_window(csk,
 931                                       (struct port_info *)netdev_priv(ndev));
 932         } else {
 933                 ndev = cxgbit_get_real_dev(n->dev);
 934                 if (!ndev) {
 935                         ret = -ENODEV;
 936                         goto out;
 937                 }
 938
 939 #ifdef CONFIG_CHELSIO_T4_DCB
 940                 if (cxgbit_get_iscsi_dcb_state(ndev))
 941                         priority = cxgbit_get_iscsi_dcb_priority(ndev,
 942                                                                  local_port);
 943
 944                 csk->dcb_priority = priority;
 945
 946                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t, n, ndev, priority);
 947 #else
 948                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t, n, ndev, 0);
 949 #endif
 950                 if (!csk->l2t)
 951                         goto out;
 952                 port_id = cxgb4_port_idx(ndev);
 953                 csk->mtu = dst_mtu(dst);
 954                 csk->tx_chan = cxgb4_port_chan(ndev);
 955                 csk->smac_idx = cxgb4_tp_smt_idx(cdev->lldi.adapter_type,
 956                                                  cxgb4_port_viid(ndev));
 957                 step = cdev->lldi.ntxq /
 958                         cdev->lldi.nports;
 959                 csk->txq_idx = (port_id * step) +
 960                                 (cdev->selectq[port_id][0]++ % step);
 961                 csk->ctrlq_idx = cxgb4_port_idx(ndev);
 962                 step = cdev->lldi.nrxq /
 963                         cdev->lldi.nports;
 964                 rxq_idx = (port_id * step) +
 965                                 (cdev->selectq[port_id][1]++ % step);
 966                 csk->rss_qid = cdev->lldi.rxq_ids[rxq_idx];
 967                 csk->port_id = port_id;
 968                 cxgbit_set_tcp_window(csk,
 969                                       (struct port_info *)netdev_priv(ndev));
 970         }
 971         ret = 0;
 972 out:
 973         rcu_read_unlock();
 974         neigh_release(n);
 975         return ret;
 976 }
 977
 978 int cxgbit_ofld_send(struct cxgbit_device *cdev, struct sk_buff *skb)
 979 {
 980         int ret = 0;
 981
 982         if (!test_bit(CDEV_STATE_UP, &cdev->flags)) {
 983                 kfree_skb(skb);
 984                 pr_err("%s - device not up - dropping\n", __func__);
 985                 return -EIO;
 986         }
 987
 988         ret = cxgb4_ofld_send(cdev->lldi.ports[0], skb);
 989         if (ret < 0)
 990                 kfree_skb(skb);
 991         return ret < 0 ? ret : 0;
 992 }
 993
 994 static void cxgbit_release_tid(struct cxgbit_device *cdev, u32 tid)
 995 {
 996         u32 len = roundup(sizeof(struct cpl_tid_release), 16);
 997         struct sk_buff *skb;
 998
 999         skb = alloc_skb(len, GFP_ATOMIC);
1000         if (!skb)
1001                 return;
1002
1003         cxgb_mk_tid_release(skb, len, tid, 0);
1004         cxgbit_ofld_send(cdev, skb);
1005 }
1006
1007 int
1008 cxgbit_l2t_send(struct cxgbit_device *cdev, struct sk_buff *skb,
1009                 struct l2t_entry *l2e)
1010 {
1011         int ret = 0;
1012
1013         if (!test_bit(CDEV_STATE_UP, &cdev->flags)) {
1014                 kfree_skb(skb);
1015                 pr_err("%s - device not up - dropping\n", __func__);
1016                 return -EIO;
1017         }
1018
1019         ret = cxgb4_l2t_send(cdev->lldi.ports[0], skb, l2e);
1020         if (ret < 0)
1021                 kfree_skb(skb);
1022         return ret < 0 ? ret : 0;
1023 }
1024
1025 static void cxgbit_send_rx_credits(struct cxgbit_sock *csk, struct sk_buff *skb)
1026 {
1027         if (csk->com.state != CSK_STATE_ESTABLISHED) {
1028                 __kfree_skb(skb);
1029                 return;
1030         }
1031
1032         cxgbit_ofld_send(csk->com.cdev, skb);
1033 }
1034
1035 /*
1036  * CPL connection rx data ack: host ->
1037  * Send RX credits through an RX_DATA_ACK CPL message.
1038  * Returns the number of credits sent.
1039  */
1040 int cxgbit_rx_data_ack(struct cxgbit_sock *csk)
1041 {
1042         struct sk_buff *skb;
1043         u32 len = roundup(sizeof(struct cpl_rx_data_ack), 16);
1044         u32 credit_dack;
1045
1046         skb = alloc_skb(len, GFP_KERNEL);
1047         if (!skb)
1048                 return -1;
1049
1050         credit_dack = RX_DACK_CHANGE_F | RX_DACK_MODE_V(1) |
1051                       RX_CREDITS_V(csk->rx_credits);
1052
1053         cxgb_mk_rx_data_ack(skb, len, csk->tid, csk->ctrlq_idx,
1054                             credit_dack);
1055
1056         csk->rx_credits = 0;
1057
1058         spin_lock_bh(&csk->lock);
1059         if (csk->lock_owner) {
1060                 cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_send_rx_credits;
1061                 __skb_queue_tail(&csk->backlogq, skb);
1062                 spin_unlock_bh(&csk->lock);
1063                 return 0;
1064         }
1065
1066         cxgbit_send_rx_credits(csk, skb);
1067         spin_unlock_bh(&csk->lock);
1068
1069         return 0;
1070 }
1071
1072 #define FLOWC_WR_NPARAMS_MIN    9
1073 #define FLOWC_WR_NPARAMS_MAX    11
1074 static int cxgbit_alloc_csk_skb(struct cxgbit_sock *csk)
1075 {
1076         struct sk_buff *skb;
1077         u32 len, flowclen;
1078         u8 i;
1079
1080         flowclen = offsetof(struct fw_flowc_wr,
1081                             mnemval[FLOWC_WR_NPARAMS_MAX]);
1082
1083         len = max_t(u32, sizeof(struct cpl_abort_req),
1084                     sizeof(struct cpl_abort_rpl));
1085
1086         len = max(len, flowclen);
1087         len = roundup(len, 16);
1088
1089         for (i = 0; i < 3; i++) {
1090                 skb = alloc_skb(len, GFP_ATOMIC);
1091                 if (!skb)
1092                         goto out;
1093                 __skb_queue_tail(&csk->skbq, skb);
1094         }
1095
1096         skb = alloc_skb(LRO_SKB_MIN_HEADROOM, GFP_ATOMIC);
1097         if (!skb)
1098                 goto out;
1099
1100         memset(skb->data, 0, LRO_SKB_MIN_HEADROOM);
1101         csk->lro_hskb = skb;
1102
1103         return 0;
1104 out:
1105         __skb_queue_purge(&csk->skbq);
1106         return -ENOMEM;
1107 }
1108
1109 static void
1110 cxgbit_pass_accept_rpl(struct cxgbit_sock *csk, struct cpl_pass_accept_req *req)
1111 {
1112         struct sk_buff *skb;
1113         const struct tcphdr *tcph;
1114         struct cpl_t5_pass_accept_rpl *rpl5;
1115         struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
1116         unsigned int len = roundup(sizeof(*rpl5), 16);
1117         unsigned int mtu_idx;
1118         u64 opt0;
1119         u32 opt2, hlen;
1120         u32 wscale;
1121         u32 win;
1122
1123         pr_debug("%s csk %p tid %u\n", __func__, csk, csk->tid);
1124
1125         skb = alloc_skb(len, GFP_ATOMIC);
1126         if (!skb) {
1127                 cxgbit_put_csk(csk);
1128                 return;
1129         }
1130
1131         rpl5 = __skb_put_zero(skb, len);
1132
1133         INIT_TP_WR(rpl5, csk->tid);
1134         OPCODE_TID(rpl5) = cpu_to_be32(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL,
1135                                                      csk->tid));
1136         cxgb_best_mtu(csk->com.cdev->lldi.mtus, csk->mtu, &mtu_idx,
1137                       req->tcpopt.tstamp,
1138                       (csk->com.remote_addr.ss_family == AF_INET) ? 0 : 1);
1139         wscale = cxgb_compute_wscale(csk->rcv_win);
1140         /*
1141          * Specify the largest window that will fit in opt0. The
1142          * remainder will be specified in the rx_data_ack.
1143          */
1144         win = csk->rcv_win >> 10;
1145         if (win > RCV_BUFSIZ_M)
1146                 win = RCV_BUFSIZ_M;
1147         opt0 =  TCAM_BYPASS_F |
1148                 WND_SCALE_V(wscale) |
1149                 MSS_IDX_V(mtu_idx) |
1150                 L2T_IDX_V(csk->l2t->idx) |
1151                 TX_CHAN_V(csk->tx_chan) |
1152                 SMAC_SEL_V(csk->smac_idx) |
1153                 DSCP_V(csk->tos >> 2) |
1154                 ULP_MODE_V(ULP_MODE_ISCSI) |
1155                 RCV_BUFSIZ_V(win);
1156
1157         opt2 = RX_CHANNEL_V(0) |
1158                 RSS_QUEUE_VALID_F | RSS_QUEUE_V(csk->rss_qid);
1159
1160         if (!is_t5(lldi->adapter_type))
1161                 opt2 |= RX_FC_DISABLE_F;
1162
1163         if (req->tcpopt.tstamp)
1164                 opt2 |= TSTAMPS_EN_F;
1165         if (req->tcpopt.sack)
1166                 opt2 |= SACK_EN_F;
1167         if (wscale)
1168                 opt2 |= WND_SCALE_EN_F;
1169
1170         hlen = ntohl(req->hdr_len);
1171
1172         if (is_t5(lldi->adapter_type))
1173                 tcph = (struct tcphdr *)((u8 *)(req + 1) +
1174                        ETH_HDR_LEN_G(hlen) + IP_HDR_LEN_G(hlen));
1175         else
1176                 tcph = (struct tcphdr *)((u8 *)(req + 1) +
1177                        T6_ETH_HDR_LEN_G(hlen) + T6_IP_HDR_LEN_G(hlen));
1178
1179         if (tcph->ece && tcph->cwr)
1180                 opt2 |= CCTRL_ECN_V(1);
1181
1182         opt2 |= RX_COALESCE_V(3);
1183         opt2 |= CONG_CNTRL_V(CONG_ALG_NEWRENO);
1184
1185         opt2 |= T5_ISS_F;
1186         rpl5->iss = cpu_to_be32((prandom_u32() & ~7UL) - 1);
1187
1188         opt2 |= T5_OPT_2_VALID_F;
1189
1190         rpl5->opt0 = cpu_to_be64(opt0);
1191         rpl5->opt2 = cpu_to_be32(opt2);
1192         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->ctrlq_idx);
1193         t4_set_arp_err_handler(skb, NULL, cxgbit_arp_failure_discard);
1194         cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
1195 }
1196
1197 static void
1198 cxgbit_pass_accept_req(struct cxgbit_device *cdev, struct sk_buff *skb)
1199 {
1200         struct cxgbit_sock *csk = NULL;
1201         struct cxgbit_np *cnp;
1202         struct cpl_pass_accept_req *req = cplhdr(skb);
1203         unsigned int stid = PASS_OPEN_TID_G(ntohl(req->tos_stid));
1204         struct tid_info *t = cdev->lldi.tids;
1205         unsigned int tid = GET_TID(req);
1206         u16 peer_mss = ntohs(req->tcpopt.mss);
1207         unsigned short hdrs;
1208
1209         struct dst_entry *dst;
1210         __u8 local_ip[16], peer_ip[16];
1211         __be16 local_port, peer_port;
1212         int ret;
1213         int iptype;
1214
1215         pr_debug("%s: cdev = %p; stid = %u; tid = %u\n",
1216                  __func__, cdev, stid, tid);
1217
1218         cnp = lookup_stid(t, stid);
1219         if (!cnp) {
1220                 pr_err("%s connect request on invalid stid %d\n",
1221                        __func__, stid);
1222                 goto rel_skb;
1223         }
1224
1225         if (cnp->com.state != CSK_STATE_LISTEN) {
1226                 pr_err("%s - listening parent not in CSK_STATE_LISTEN\n",
1227                        __func__);
1228                 goto reject;
1229         }
1230
1231         csk = lookup_tid(t, tid);
1232         if (csk) {
1233                 pr_err("%s csk not null tid %u\n",
1234                        __func__, tid);
1235                 goto rel_skb;
1236         }
1237
1238         cxgb_get_4tuple(req, cdev->lldi.adapter_type, &iptype, local_ip,
1239                         peer_ip, &local_port, &peer_port);
1240
1241         /* Find output route */
1242         if (iptype == 4)  {
1243                 pr_debug("%s parent sock %p tid %u laddr %pI4 raddr %pI4 "
1244                          "lport %d rport %d peer_mss %d\n"
1245                          , __func__, cnp, tid,
1246                          local_ip, peer_ip, ntohs(local_port),
1247                          ntohs(peer_port), peer_mss);
1248                 dst = cxgb_find_route(&cdev->lldi, cxgbit_get_real_dev,
1249                                       *(__be32 *)local_ip,
1250                                       *(__be32 *)peer_ip,
1251                                       local_port, peer_port,
1252                                       PASS_OPEN_TOS_G(ntohl(req->tos_stid)));
1253         } else {
1254                 pr_debug("%s parent sock %p tid %u laddr %pI6 raddr %pI6 "
1255                          "lport %d rport %d peer_mss %d\n"
1256                          , __func__, cnp, tid,
1257                          local_ip, peer_ip, ntohs(local_port),
1258                          ntohs(peer_port), peer_mss);
1259                 dst = cxgb_find_route6(&cdev->lldi, cxgbit_get_real_dev,
1260                                        local_ip, peer_ip,
1261                                        local_port, peer_port,
1262                                        PASS_OPEN_TOS_G(ntohl(req->tos_stid)),
1263                                        ((struct sockaddr_in6 *)
1264                                         &cnp->com.local_addr)->sin6_scope_id);
1265         }
1266         if (!dst) {
1267                 pr_err("%s - failed to find dst entry!\n",
1268                        __func__);
1269                 goto reject;
1270         }
1271
1272         csk = kzalloc(sizeof(*csk), GFP_ATOMIC);
1273         if (!csk) {
1274                 dst_release(dst);
1275                 goto rel_skb;
1276         }
1277
1278         ret = cxgbit_offload_init(csk, iptype, peer_ip, ntohs(local_port),
1279                                   dst, cdev);
1280         if (ret) {
1281                 pr_err("%s - failed to allocate l2t entry!\n",
1282                        __func__);
1283                 dst_release(dst);
1284                 kfree(csk);
1285                 goto reject;
1286         }
1287
1288         kref_init(&csk->kref);
1289         init_completion(&csk->com.wr_wait.completion);
1290
1291         INIT_LIST_HEAD(&csk->accept_node);
1292
1293         hdrs = (iptype == 4 ? sizeof(struct iphdr) : sizeof(struct ipv6hdr)) +
1294                 sizeof(struct tcphdr) + (req->tcpopt.tstamp ? 12 : 0);
1295         if (peer_mss && csk->mtu > (peer_mss + hdrs))
1296                 csk->mtu = peer_mss + hdrs;
1297
1298         csk->com.state = CSK_STATE_CONNECTING;
1299         csk->com.cdev = cdev;
1300         csk->cnp = cnp;
1301         csk->tos = PASS_OPEN_TOS_G(ntohl(req->tos_stid));
1302         csk->dst = dst;
1303         csk->tid = tid;
1304         csk->wr_cred = cdev->lldi.wr_cred -
1305                         DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1306         csk->wr_max_cred = csk->wr_cred;
1307         csk->wr_una_cred = 0;
1308
1309         if (iptype == 4) {
1310                 struct sockaddr_in *sin = (struct sockaddr_in *)
1311                                           &csk->com.local_addr;
1312                 sin->sin_family = AF_INET;
1313                 sin->sin_port = local_port;
1314                 sin->sin_addr.s_addr = *(__be32 *)local_ip;
1315
1316                 sin = (struct sockaddr_in *)&csk->com.remote_addr;
1317                 sin->sin_family = AF_INET;
1318                 sin->sin_port = peer_port;
1319                 sin->sin_addr.s_addr = *(__be32 *)peer_ip;
1320         } else {
1321                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
1322                                             &csk->com.local_addr;
1323
1324                 sin6->sin6_family = PF_INET6;
1325                 sin6->sin6_port = local_port;
1326                 memcpy(sin6->sin6_addr.s6_addr, local_ip, 16);
1327                 cxgb4_clip_get(cdev->lldi.ports[0],
1328                                (const u32 *)&sin6->sin6_addr.s6_addr,
1329                                1);
1330
1331                 sin6 = (struct sockaddr_in6 *)&csk->com.remote_addr;
1332                 sin6->sin6_family = PF_INET6;
1333                 sin6->sin6_port = peer_port;
1334                 memcpy(sin6->sin6_addr.s6_addr, peer_ip, 16);
1335         }
1336
1337         skb_queue_head_init(&csk->rxq);
1338         skb_queue_head_init(&csk->txq);
1339         skb_queue_head_init(&csk->ppodq);
1340         skb_queue_head_init(&csk->backlogq);
1341         skb_queue_head_init(&csk->skbq);
1342         cxgbit_sock_reset_wr_list(csk);
1343         spin_lock_init(&csk->lock);
1344         init_waitqueue_head(&csk->waitq);
1345         init_waitqueue_head(&csk->ack_waitq);
1346         csk->lock_owner = false;
1347
1348         if (cxgbit_alloc_csk_skb(csk)) {
1349                 dst_release(dst);
1350                 kfree(csk);
1351                 goto rel_skb;
1352         }
1353
1354         cxgbit_get_cdev(cdev);
1355
1356         spin_lock(&cdev->cskq.lock);
1357         list_add_tail(&csk->list, &cdev->cskq.list);
1358         spin_unlock(&cdev->cskq.lock);
1359         cxgb4_insert_tid(t, csk, tid, csk->com.local_addr.ss_family);
1360         cxgbit_pass_accept_rpl(csk, req);
1361         goto rel_skb;
1362
1363 reject:
1364         cxgbit_release_tid(cdev, tid);
1365 rel_skb:
1366         __kfree_skb(skb);
1367 }
1368
1369 static u32
1370 cxgbit_tx_flowc_wr_credits(struct cxgbit_sock *csk, u32 *nparamsp,
1371                            u32 *flowclenp)
1372 {
1373         u32 nparams, flowclen16, flowclen;
1374
1375         nparams = FLOWC_WR_NPARAMS_MIN;
1376
1377         if (csk->snd_wscale)
1378                 nparams++;
1379
1380 #ifdef CONFIG_CHELSIO_T4_DCB
1381         nparams++;
1382 #endif
1383         flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
1384         flowclen16 = DIV_ROUND_UP(flowclen, 16);
1385         flowclen = flowclen16 * 16;
1386         /*
1387          * Return the number of 16-byte credits used by the flowc request.
1388          * Pass back the nparams and actual flowc length if requested.
1389          */
1390         if (nparamsp)
1391                 *nparamsp = nparams;
1392         if (flowclenp)
1393                 *flowclenp = flowclen;
1394         return flowclen16;
1395 }
1396
1397 u32 cxgbit_send_tx_flowc_wr(struct cxgbit_sock *csk)
1398 {
1399         struct cxgbit_device *cdev = csk->com.cdev;
1400         struct fw_flowc_wr *flowc;
1401         u32 nparams, flowclen16, flowclen;
1402         struct sk_buff *skb;
1403         u8 index;
1404
1405 #ifdef CONFIG_CHELSIO_T4_DCB
1406         u16 vlan = ((struct l2t_entry *)csk->l2t)->vlan;
1407 #endif
1408
1409         flowclen16 = cxgbit_tx_flowc_wr_credits(csk, &nparams, &flowclen);
1410
1411         skb = __skb_dequeue(&csk->skbq);
1412         flowc = __skb_put_zero(skb, flowclen);
1413
1414         flowc->op_to_nparams = cpu_to_be32(FW_WR_OP_V(FW_FLOWC_WR) |
1415                                            FW_FLOWC_WR_NPARAMS_V(nparams));
1416         flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(flowclen16) |
1417                                           FW_WR_FLOWID_V(csk->tid));
1418         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
1419         flowc->mnemval[0].val = cpu_to_be32(FW_PFVF_CMD_PFN_V
1420                                             (csk->com.cdev->lldi.pf));
1421         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
1422         flowc->mnemval[1].val = cpu_to_be32(csk->tx_chan);
1423         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
1424         flowc->mnemval[2].val = cpu_to_be32(csk->tx_chan);
1425         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
1426         flowc->mnemval[3].val = cpu_to_be32(csk->rss_qid);
1427         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
1428         flowc->mnemval[4].val = cpu_to_be32(csk->snd_nxt);
1429         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
1430         flowc->mnemval[5].val = cpu_to_be32(csk->rcv_nxt);
1431         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
1432         flowc->mnemval[6].val = cpu_to_be32(csk->snd_win);
1433         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
1434         flowc->mnemval[7].val = cpu_to_be32(csk->emss);
1435
1436         flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
1437         if (test_bit(CDEV_ISO_ENABLE, &cdev->flags))
1438                 flowc->mnemval[8].val = cpu_to_be32(CXGBIT_MAX_ISO_PAYLOAD);
1439         else
1440                 flowc->mnemval[8].val = cpu_to_be32(16384);
1441
1442         index = 9;
1443
1444         if (csk->snd_wscale) {
1445                 flowc->mnemval[index].mnemonic = FW_FLOWC_MNEM_RCV_SCALE;
1446                 flowc->mnemval[index].val = cpu_to_be32(csk->snd_wscale);
1447                 index++;
1448         }
1449
1450 #ifdef CONFIG_CHELSIO_T4_DCB
1451         flowc->mnemval[index].mnemonic = FW_FLOWC_MNEM_DCBPRIO;
1452         if (vlan == VLAN_NONE) {
1453                 pr_warn("csk %u without VLAN Tag on DCB Link\n", csk->tid);
1454                 flowc->mnemval[index].val = cpu_to_be32(0);
1455         } else
1456                 flowc->mnemval[index].val = cpu_to_be32(
1457                                 (vlan & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT);
1458 #endif
1459
1460         pr_debug("%s: csk %p; tx_chan = %u; rss_qid = %u; snd_seq = %u;"
1461                  " rcv_seq = %u; snd_win = %u; emss = %u\n",
1462                  __func__, csk, csk->tx_chan, csk->rss_qid, csk->snd_nxt,
1463                  csk->rcv_nxt, csk->snd_win, csk->emss);
1464         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx);
1465         cxgbit_ofld_send(csk->com.cdev, skb);
1466         return flowclen16;
1467 }
1468
1469 int cxgbit_setup_conn_digest(struct cxgbit_sock *csk)
1470 {
1471         struct sk_buff *skb;
1472         struct cpl_set_tcb_field *req;
1473         u8 hcrc = csk->submode & CXGBIT_SUBMODE_HCRC;
1474         u8 dcrc = csk->submode & CXGBIT_SUBMODE_DCRC;
1475         unsigned int len = roundup(sizeof(*req), 16);
1476         int ret;
1477
1478         skb = alloc_skb(len, GFP_KERNEL);
1479         if (!skb)
1480                 return -ENOMEM;
1481
1482         /*  set up ulp submode */
1483         req = __skb_put_zero(skb, len);
1484
1485         INIT_TP_WR(req, csk->tid);
1486         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1487         req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
1488         req->word_cookie = htons(0);
1489         req->mask = cpu_to_be64(0x3 << 4);
1490         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1491                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1492         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->ctrlq_idx);
1493
1494         cxgbit_get_csk(csk);
1495         cxgbit_init_wr_wait(&csk->com.wr_wait);
1496
1497         cxgbit_ofld_send(csk->com.cdev, skb);
1498
1499         ret = cxgbit_wait_for_reply(csk->com.cdev,
1500                                     &csk->com.wr_wait,
1501                                     csk->tid, 5, __func__);
1502         if (ret)
1503                 return -1;
1504
1505         return 0;
1506 }
1507
1508 int cxgbit_setup_conn_pgidx(struct cxgbit_sock *csk, u32 pg_idx)
1509 {
1510         struct sk_buff *skb;
1511         struct cpl_set_tcb_field *req;
1512         unsigned int len = roundup(sizeof(*req), 16);
1513         int ret;
1514
1515         skb = alloc_skb(len, GFP_KERNEL);
1516         if (!skb)
1517                 return -ENOMEM;
1518
1519         req = __skb_put_zero(skb, len);
1520
1521         INIT_TP_WR(req, csk->tid);
1522         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1523         req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
1524         req->word_cookie = htons(0);
1525         req->mask = cpu_to_be64(0x3 << 8);
1526         req->val = cpu_to_be64(pg_idx << 8);
1527         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->ctrlq_idx);
1528
1529         cxgbit_get_csk(csk);
1530         cxgbit_init_wr_wait(&csk->com.wr_wait);
1531
1532         cxgbit_ofld_send(csk->com.cdev, skb);
1533
1534         ret = cxgbit_wait_for_reply(csk->com.cdev,
1535                                     &csk->com.wr_wait,
1536                                     csk->tid, 5, __func__);
1537         if (ret)
1538                 return -1;
1539
1540         return 0;
1541 }
1542
1543 static void
1544 cxgbit_pass_open_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1545 {
1546         struct cpl_pass_open_rpl *rpl = cplhdr(skb);
1547         struct tid_info *t = cdev->lldi.tids;
1548         unsigned int stid = GET_TID(rpl);
1549         struct cxgbit_np *cnp = lookup_stid(t, stid);
1550
1551         pr_debug("%s: cnp = %p; stid = %u; status = %d\n",
1552                  __func__, cnp, stid, rpl->status);
1553
1554         if (!cnp) {
1555                 pr_info("%s stid %d lookup failure\n", __func__, stid);
1556                 goto rel_skb;
1557         }
1558
1559         cxgbit_wake_up(&cnp->com.wr_wait, __func__, rpl->status);
1560         cxgbit_put_cnp(cnp);
1561 rel_skb:
1562         __kfree_skb(skb);
1563 }
1564
1565 static void
1566 cxgbit_close_listsrv_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1567 {
1568         struct cpl_close_listsvr_rpl *rpl = cplhdr(skb);
1569         struct tid_info *t = cdev->lldi.tids;
1570         unsigned int stid = GET_TID(rpl);
1571         struct cxgbit_np *cnp = lookup_stid(t, stid);
1572
1573         pr_debug("%s: cnp = %p; stid = %u; status = %d\n",
1574                  __func__, cnp, stid, rpl->status);
1575
1576         if (!cnp) {
1577                 pr_info("%s stid %d lookup failure\n", __func__, stid);
1578                 goto rel_skb;
1579         }
1580
1581         cxgbit_wake_up(&cnp->com.wr_wait, __func__, rpl->status);
1582         cxgbit_put_cnp(cnp);
1583 rel_skb:
1584         __kfree_skb(skb);
1585 }
1586
1587 static void
1588 cxgbit_pass_establish(struct cxgbit_device *cdev, struct sk_buff *skb)
1589 {
1590         struct cpl_pass_establish *req = cplhdr(skb);
1591         struct tid_info *t = cdev->lldi.tids;
1592         unsigned int tid = GET_TID(req);
1593         struct cxgbit_sock *csk;
1594         struct cxgbit_np *cnp;
1595         u16 tcp_opt = be16_to_cpu(req->tcp_opt);
1596         u32 snd_isn = be32_to_cpu(req->snd_isn);
1597         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
1598
1599         csk = lookup_tid(t, tid);
1600         if (unlikely(!csk)) {
1601                 pr_err("can't find connection for tid %u.\n", tid);
1602                 goto rel_skb;
1603         }
1604         cnp = csk->cnp;
1605
1606         pr_debug("%s: csk %p; tid %u; cnp %p\n",
1607                  __func__, csk, tid, cnp);
1608
1609         csk->write_seq = snd_isn;
1610         csk->snd_una = snd_isn;
1611         csk->snd_nxt = snd_isn;
1612
1613         csk->rcv_nxt = rcv_isn;
1614
1615         if (csk->rcv_win > (RCV_BUFSIZ_M << 10))
1616                 csk->rx_credits = (csk->rcv_win - (RCV_BUFSIZ_M << 10));
1617
1618         csk->snd_wscale = TCPOPT_SND_WSCALE_G(tcp_opt);
1619         cxgbit_set_emss(csk, tcp_opt);
1620         dst_confirm(csk->dst);
1621         csk->com.state = CSK_STATE_ESTABLISHED;
1622         spin_lock_bh(&cnp->np_accept_lock);
1623         list_add_tail(&csk->accept_node, &cnp->np_accept_list);
1624         spin_unlock_bh(&cnp->np_accept_lock);
1625         complete(&cnp->accept_comp);
1626 rel_skb:
1627         __kfree_skb(skb);
1628 }
1629
1630 static void cxgbit_queue_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1631 {
1632         cxgbit_skcb_flags(skb) = 0;
1633         spin_lock_bh(&csk->rxq.lock);
1634         __skb_queue_tail(&csk->rxq, skb);
1635         spin_unlock_bh(&csk->rxq.lock);
1636         wake_up(&csk->waitq);
1637 }
1638
1639 static void cxgbit_peer_close(struct cxgbit_sock *csk, struct sk_buff *skb)
1640 {
1641         pr_debug("%s: csk %p; tid %u; state %d\n",
1642                  __func__, csk, csk->tid, csk->com.state);
1643
1644         switch (csk->com.state) {
1645         case CSK_STATE_ESTABLISHED:
1646                 csk->com.state = CSK_STATE_CLOSING;
1647                 cxgbit_queue_rx_skb(csk, skb);
1648                 return;
1649         case CSK_STATE_CLOSING:
1650                 /* simultaneous close */
1651                 csk->com.state = CSK_STATE_MORIBUND;
1652                 break;
1653         case CSK_STATE_MORIBUND:
1654                 csk->com.state = CSK_STATE_DEAD;
1655                 cxgbit_put_csk(csk);
1656                 break;
1657         case CSK_STATE_ABORTING:
1658                 break;
1659         default:
1660                 pr_info("%s: cpl_peer_close in bad state %d\n",
1661                         __func__, csk->com.state);
1662         }
1663
1664         __kfree_skb(skb);
1665 }
1666
1667 static void cxgbit_close_con_rpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1668 {
1669         pr_debug("%s: csk %p; tid %u; state %d\n",
1670                  __func__, csk, csk->tid, csk->com.state);
1671
1672         switch (csk->com.state) {
1673         case CSK_STATE_CLOSING:
1674                 csk->com.state = CSK_STATE_MORIBUND;
1675                 break;
1676         case CSK_STATE_MORIBUND:
1677                 csk->com.state = CSK_STATE_DEAD;
1678                 cxgbit_put_csk(csk);
1679                 break;
1680         case CSK_STATE_ABORTING:
1681         case CSK_STATE_DEAD:
1682                 break;
1683         default:
1684                 pr_info("%s: cpl_close_con_rpl in bad state %d\n",
1685                         __func__, csk->com.state);
1686         }
1687
1688         __kfree_skb(skb);
1689 }
1690
1691 static void cxgbit_abort_req_rss(struct cxgbit_sock *csk, struct sk_buff *skb)
1692 {
1693         struct cpl_abort_req_rss *hdr = cplhdr(skb);
1694         unsigned int tid = GET_TID(hdr);
1695         struct sk_buff *rpl_skb;
1696         bool release = false;
1697         bool wakeup_thread = false;
1698         u32 len = roundup(sizeof(struct cpl_abort_rpl), 16);
1699
1700         pr_debug("%s: csk %p; tid %u; state %d\n",
1701                  __func__, csk, tid, csk->com.state);
1702
1703         if (cxgb_is_neg_adv(hdr->status)) {
1704                 pr_err("%s: got neg advise %d on tid %u\n",
1705                        __func__, hdr->status, tid);
1706                 goto rel_skb;
1707         }
1708
1709         switch (csk->com.state) {
1710         case CSK_STATE_CONNECTING:
1711         case CSK_STATE_MORIBUND:
1712                 csk->com.state = CSK_STATE_DEAD;
1713                 release = true;
1714                 break;
1715         case CSK_STATE_ESTABLISHED:
1716                 csk->com.state = CSK_STATE_DEAD;
1717                 wakeup_thread = true;
1718                 break;
1719         case CSK_STATE_CLOSING:
1720                 csk->com.state = CSK_STATE_DEAD;
1721                 if (!csk->conn)
1722                         release = true;
1723                 break;
1724         case CSK_STATE_ABORTING:
1725                 break;
1726         default:
1727                 pr_info("%s: cpl_abort_req_rss in bad state %d\n",
1728                         __func__, csk->com.state);
1729                 csk->com.state = CSK_STATE_DEAD;
1730         }
1731
1732         __skb_queue_purge(&csk->txq);
1733
1734         if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags))
1735                 cxgbit_send_tx_flowc_wr(csk);
1736
1737         rpl_skb = __skb_dequeue(&csk->skbq);
1738
1739         cxgb_mk_abort_rpl(rpl_skb, len, csk->tid, csk->txq_idx);
1740         cxgbit_ofld_send(csk->com.cdev, rpl_skb);
1741
1742         if (wakeup_thread) {
1743                 cxgbit_queue_rx_skb(csk, skb);
1744                 return;
1745         }
1746
1747         if (release)
1748                 cxgbit_put_csk(csk);
1749 rel_skb:
1750         __kfree_skb(skb);
1751 }
1752
1753 static void cxgbit_abort_rpl_rss(struct cxgbit_sock *csk, struct sk_buff *skb)
1754 {
1755         struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
1756
1757         pr_debug("%s: csk %p; tid %u; state %d\n",
1758                  __func__, csk, csk->tid, csk->com.state);
1759
1760         switch (csk->com.state) {
1761         case CSK_STATE_ABORTING:
1762                 csk->com.state = CSK_STATE_DEAD;
1763                 if (test_bit(CSK_ABORT_RPL_WAIT, &csk->com.flags))
1764                         cxgbit_wake_up(&csk->com.wr_wait, __func__,
1765                                        rpl->status);
1766                 cxgbit_put_csk(csk);
1767                 break;
1768         default:
1769                 pr_info("%s: cpl_abort_rpl_rss in state %d\n",
1770                         __func__, csk->com.state);
1771         }
1772
1773         __kfree_skb(skb);
1774 }
1775
1776 static bool cxgbit_credit_err(const struct cxgbit_sock *csk)
1777 {
1778         const struct sk_buff *skb = csk->wr_pending_head;
1779         u32 credit = 0;
1780
1781         if (unlikely(csk->wr_cred > csk->wr_max_cred)) {
1782                 pr_err("csk 0x%p, tid %u, credit %u > %u\n",
1783                        csk, csk->tid, csk->wr_cred, csk->wr_max_cred);
1784                 return true;
1785         }
1786
1787         while (skb) {
1788                 credit += (__force u32)skb->csum;
1789                 skb = cxgbit_skcb_tx_wr_next(skb);
1790         }
1791
1792         if (unlikely((csk->wr_cred + credit) != csk->wr_max_cred)) {
1793                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1794                        csk, csk->tid, csk->wr_cred,
1795                        credit, csk->wr_max_cred);
1796
1797                 return true;
1798         }
1799
1800         return false;
1801 }
1802
1803 static void cxgbit_fw4_ack(struct cxgbit_sock *csk, struct sk_buff *skb)
1804 {
1805         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)cplhdr(skb);
1806         u32 credits = rpl->credits;
1807         u32 snd_una = ntohl(rpl->snd_una);
1808
1809         csk->wr_cred += credits;
1810         if (csk->wr_una_cred > (csk->wr_max_cred - csk->wr_cred))
1811                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1812
1813         while (credits) {
1814                 struct sk_buff *p = cxgbit_sock_peek_wr(csk);
1815                 const u32 csum = (__force u32)p->csum;
1816
1817                 if (unlikely(!p)) {
1818                         pr_err("csk 0x%p,%u, cr %u,%u+%u, empty.\n",
1819                                csk, csk->tid, credits,
1820                                csk->wr_cred, csk->wr_una_cred);
1821                         break;
1822                 }
1823
1824                 if (unlikely(credits < csum)) {
1825                         pr_warn("csk 0x%p,%u, cr %u,%u+%u, < %u.\n",
1826                                 csk,  csk->tid,
1827                                 credits, csk->wr_cred, csk->wr_una_cred,
1828                                 csum);
1829                         p->csum = (__force __wsum)(csum - credits);
1830                         break;
1831                 }
1832
1833                 cxgbit_sock_dequeue_wr(csk);
1834                 credits -= csum;
1835                 kfree_skb(p);
1836         }
1837
1838         if (unlikely(cxgbit_credit_err(csk))) {
1839                 cxgbit_queue_rx_skb(csk, skb);
1840                 return;
1841         }
1842
1843         if (rpl->seq_vld & CPL_FW4_ACK_FLAGS_SEQVAL) {
1844                 if (unlikely(before(snd_una, csk->snd_una))) {
1845                         pr_warn("csk 0x%p,%u, snd_una %u/%u.",
1846                                 csk, csk->tid, snd_una,
1847                                 csk->snd_una);
1848                         goto rel_skb;
1849                 }
1850
1851                 if (csk->snd_una != snd_una) {
1852                         csk->snd_una = snd_una;
1853                         dst_confirm(csk->dst);
1854                         wake_up(&csk->ack_waitq);
1855                 }
1856         }
1857
1858         if (skb_queue_len(&csk->txq))
1859                 cxgbit_push_tx_frames(csk);
1860
1861 rel_skb:
1862         __kfree_skb(skb);
1863 }
1864
1865 static void cxgbit_set_tcb_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1866 {
1867         struct cxgbit_sock *csk;
1868         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1869         unsigned int tid = GET_TID(rpl);
1870         struct cxgb4_lld_info *lldi = &cdev->lldi;
1871         struct tid_info *t = lldi->tids;
1872
1873         csk = lookup_tid(t, tid);
1874         if (unlikely(!csk)) {
1875                 pr_err("can't find connection for tid %u.\n", tid);
1876                 goto rel_skb;
1877         } else {
1878                 cxgbit_wake_up(&csk->com.wr_wait, __func__, rpl->status);
1879         }
1880
1881         cxgbit_put_csk(csk);
1882 rel_skb:
1883         __kfree_skb(skb);
1884 }
1885
1886 static void cxgbit_rx_data(struct cxgbit_device *cdev, struct sk_buff *skb)
1887 {
1888         struct cxgbit_sock *csk;
1889         struct cpl_rx_data *cpl = cplhdr(skb);
1890         unsigned int tid = GET_TID(cpl);
1891         struct cxgb4_lld_info *lldi = &cdev->lldi;
1892         struct tid_info *t = lldi->tids;
1893
1894         csk = lookup_tid(t, tid);
1895         if (unlikely(!csk)) {
1896                 pr_err("can't find conn. for tid %u.\n", tid);
1897                 goto rel_skb;
1898         }
1899
1900         cxgbit_queue_rx_skb(csk, skb);
1901         return;
1902 rel_skb:
1903         __kfree_skb(skb);
1904 }
1905
1906 static void
1907 __cxgbit_process_rx_cpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1908 {
1909         spin_lock(&csk->lock);
1910         if (csk->lock_owner) {
1911                 __skb_queue_tail(&csk->backlogq, skb);
1912                 spin_unlock(&csk->lock);
1913                 return;
1914         }
1915
1916         cxgbit_skcb_rx_backlog_fn(skb)(csk, skb);
1917         spin_unlock(&csk->lock);
1918 }
1919
1920 static void cxgbit_process_rx_cpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1921 {
1922         cxgbit_get_csk(csk);
1923         __cxgbit_process_rx_cpl(csk, skb);
1924         cxgbit_put_csk(csk);
1925 }
1926
1927 static void cxgbit_rx_cpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1928 {
1929         struct cxgbit_sock *csk;
1930         struct cpl_tx_data *cpl = cplhdr(skb);
1931         struct cxgb4_lld_info *lldi = &cdev->lldi;
1932         struct tid_info *t = lldi->tids;
1933         unsigned int tid = GET_TID(cpl);
1934         u8 opcode = cxgbit_skcb_rx_opcode(skb);
1935         bool ref = true;
1936
1937         switch (opcode) {
1938         case CPL_FW4_ACK:
1939                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_fw4_ack;
1940                         ref = false;
1941                         break;
1942         case CPL_PEER_CLOSE:
1943                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_peer_close;
1944                         break;
1945         case CPL_CLOSE_CON_RPL:
1946                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_close_con_rpl;
1947                         break;
1948         case CPL_ABORT_REQ_RSS:
1949                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_abort_req_rss;
1950                         break;
1951         case CPL_ABORT_RPL_RSS:
1952                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_abort_rpl_rss;
1953                         break;
1954         default:
1955                 goto rel_skb;
1956         }
1957
1958         csk = lookup_tid(t, tid);
1959         if (unlikely(!csk)) {
1960                 pr_err("can't find conn. for tid %u.\n", tid);
1961                 goto rel_skb;
1962         }
1963
1964         if (ref)
1965                 cxgbit_process_rx_cpl(csk, skb);
1966         else
1967                 __cxgbit_process_rx_cpl(csk, skb);
1968
1969         return;
1970 rel_skb:
1971         __kfree_skb(skb);
1972 }
1973
1974 cxgbit_cplhandler_func cxgbit_cplhandlers[NUM_CPL_CMDS] = {
1975         [CPL_PASS_OPEN_RPL]     = cxgbit_pass_open_rpl,
1976         [CPL_CLOSE_LISTSRV_RPL] = cxgbit_close_listsrv_rpl,
1977         [CPL_PASS_ACCEPT_REQ]   = cxgbit_pass_accept_req,
1978         [CPL_PASS_ESTABLISH]    = cxgbit_pass_establish,
1979         [CPL_SET_TCB_RPL]       = cxgbit_set_tcb_rpl,
1980         [CPL_RX_DATA]           = cxgbit_rx_data,
1981         [CPL_FW4_ACK]           = cxgbit_rx_cpl,
1982         [CPL_PEER_CLOSE]        = cxgbit_rx_cpl,
1983         [CPL_CLOSE_CON_RPL]     = cxgbit_rx_cpl,
1984         [CPL_ABORT_REQ_RSS]     = cxgbit_rx_cpl,
1985         [CPL_ABORT_RPL_RSS]     = cxgbit_rx_cpl,
1986 };