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 void cxgbit_free_conn(struct iscsi_conn *conn)
 669 {
 670         struct cxgbit_sock *csk = conn->context;
 671         bool release = false;
 672
 673         pr_debug("%s: state %d\n",
 674                  __func__, csk->com.state);
 675
 676         spin_lock_bh(&csk->lock);
 677         switch (csk->com.state) {
 678         case CSK_STATE_ESTABLISHED:
 679                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
 680                         csk->com.state = CSK_STATE_CLOSING;
 681                         cxgbit_send_halfclose(csk);
 682                 } else {
 683                         csk->com.state = CSK_STATE_ABORTING;
 684                         cxgbit_send_abort_req(csk);
 685                 }
 686                 break;
 687         case CSK_STATE_CLOSING:
 688                 csk->com.state = CSK_STATE_MORIBUND;
 689                 cxgbit_send_halfclose(csk);
 690                 break;
 691         case CSK_STATE_DEAD:
 692                 release = true;
 693                 break;
 694         default:
 695                 pr_err("%s: csk %p; state %d\n",
 696                        __func__, csk, csk->com.state);
 697         }
 698         spin_unlock_bh(&csk->lock);
 699
 700         if (release)
 701                 cxgbit_put_csk(csk);
 702 }
 703
 704 static void cxgbit_set_emss(struct cxgbit_sock *csk, u16 opt)
 705 {
 706         csk->emss = csk->com.cdev->lldi.mtus[TCPOPT_MSS_G(opt)] -
 707                         ((csk->com.remote_addr.ss_family == AF_INET) ?
 708                         sizeof(struct iphdr) : sizeof(struct ipv6hdr)) -
 709                         sizeof(struct tcphdr);
 710         csk->mss = csk->emss;
 711         if (TCPOPT_TSTAMP_G(opt))
 712                 csk->emss -= round_up(TCPOLEN_TIMESTAMP, 4);
 713         if (csk->emss < 128)
 714                 csk->emss = 128;
 715         if (csk->emss & 7)
 716                 pr_info("Warning: misaligned mtu idx %u mss %u emss=%u\n",
 717                         TCPOPT_MSS_G(opt), csk->mss, csk->emss);
 718         pr_debug("%s mss_idx %u mss %u emss=%u\n", __func__, TCPOPT_MSS_G(opt),
 719                  csk->mss, csk->emss);
 720 }
 721
 722 static void cxgbit_free_skb(struct cxgbit_sock *csk)
 723 {
 724         struct sk_buff *skb;
 725
 726         __skb_queue_purge(&csk->txq);
 727         __skb_queue_purge(&csk->rxq);
 728         __skb_queue_purge(&csk->backlogq);
 729         __skb_queue_purge(&csk->ppodq);
 730         __skb_queue_purge(&csk->skbq);
 731
 732         while ((skb = cxgbit_sock_dequeue_wr(csk)))
 733                 kfree_skb(skb);
 734
 735         __kfree_skb(csk->lro_hskb);
 736 }
 737
 738 void _cxgbit_free_csk(struct kref *kref)
 739 {
 740         struct cxgbit_sock *csk;
 741         struct cxgbit_device *cdev;
 742
 743         csk = container_of(kref, struct cxgbit_sock, kref);
 744
 745         pr_debug("%s csk %p state %d\n", __func__, csk, csk->com.state);
 746
 747         if (csk->com.local_addr.ss_family == AF_INET6) {
 748                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
 749                                              &csk->com.local_addr;
 750                 cxgb4_clip_release(csk->com.cdev->lldi.ports[0],
 751                                    (const u32 *)
 752                                    &sin6->sin6_addr.s6_addr, 1);
 753         }
 754
 755         cxgb4_remove_tid(csk->com.cdev->lldi.tids, 0, csk->tid,
 756                          csk->com.local_addr.ss_family);
 757         dst_release(csk->dst);
 758         cxgb4_l2t_release(csk->l2t);
 759
 760         cdev = csk->com.cdev;
 761         spin_lock_bh(&cdev->cskq.lock);
 762         list_del(&csk->list);
 763         spin_unlock_bh(&cdev->cskq.lock);
 764
 765         cxgbit_free_skb(csk);
 766         cxgbit_put_cdev(cdev);
 767
 768         kfree(csk);
 769 }
 770
 771 static void cxgbit_set_tcp_window(struct cxgbit_sock *csk, struct port_info *pi)
 772 {
 773         unsigned int linkspeed;
 774         u8 scale;
 775
 776         linkspeed = pi->link_cfg.speed;
 777         scale = linkspeed / SPEED_10000;
 778
 779 #define CXGBIT_10G_RCV_WIN (256 * 1024)
 780         csk->rcv_win = CXGBIT_10G_RCV_WIN;
 781         if (scale)
 782                 csk->rcv_win *= scale;
 783
 784 #define CXGBIT_10G_SND_WIN (256 * 1024)
 785         csk->snd_win = CXGBIT_10G_SND_WIN;
 786         if (scale)
 787                 csk->snd_win *= scale;
 788
 789         pr_debug("%s snd_win %d rcv_win %d\n",
 790                  __func__, csk->snd_win, csk->rcv_win);
 791 }
 792
 793 #ifdef CONFIG_CHELSIO_T4_DCB
 794 static u8 cxgbit_get_iscsi_dcb_state(struct net_device *ndev)
 795 {
 796         return ndev->dcbnl_ops->getstate(ndev);
 797 }
 798
 799 static int cxgbit_select_priority(int pri_mask)
 800 {
 801         if (!pri_mask)
 802                 return 0;
 803
 804         return (ffs(pri_mask) - 1);
 805 }
 806
 807 static u8 cxgbit_get_iscsi_dcb_priority(struct net_device *ndev, u16 local_port)
 808 {
 809         int ret;
 810         u8 caps;
 811
 812         struct dcb_app iscsi_dcb_app = {
 813                 .protocol = local_port
 814         };
 815
 816         ret = (int)ndev->dcbnl_ops->getcap(ndev, DCB_CAP_ATTR_DCBX, &caps);
 817
 818         if (ret)
 819                 return 0;
 820
 821         if (caps & DCB_CAP_DCBX_VER_IEEE) {
 822                 iscsi_dcb_app.selector = IEEE_8021QAZ_APP_SEL_ANY;
 823
 824                 ret = dcb_ieee_getapp_mask(ndev, &iscsi_dcb_app);
 825
 826         } else if (caps & DCB_CAP_DCBX_VER_CEE) {
 827                 iscsi_dcb_app.selector = DCB_APP_IDTYPE_PORTNUM;
 828
 829                 ret = dcb_getapp(ndev, &iscsi_dcb_app);
 830         }
 831
 832         pr_info("iSCSI priority is set to %u\n", cxgbit_select_priority(ret));
 833
 834         return cxgbit_select_priority(ret);
 835 }
 836 #endif
 837
 838 static int
 839 cxgbit_offload_init(struct cxgbit_sock *csk, int iptype, __u8 *peer_ip,
 840                     u16 local_port, struct dst_entry *dst,
 841                     struct cxgbit_device *cdev)
 842 {
 843         struct neighbour *n;
 844         int ret, step;
 845         struct net_device *ndev;
 846         u16 rxq_idx, port_id;
 847 #ifdef CONFIG_CHELSIO_T4_DCB
 848         u8 priority = 0;
 849 #endif
 850
 851         n = dst_neigh_lookup(dst, peer_ip);
 852         if (!n)
 853                 return -ENODEV;
 854
 855         rcu_read_lock();
 856         ret = -ENOMEM;
 857         if (n->dev->flags & IFF_LOOPBACK) {
 858                 if (iptype == 4)
 859                         ndev = cxgbit_ipv4_netdev(*(__be32 *)peer_ip);
 860                 else if (IS_ENABLED(CONFIG_IPV6))
 861                         ndev = cxgbit_ipv6_netdev((struct in6_addr *)peer_ip);
 862                 else
 863                         ndev = NULL;
 864
 865                 if (!ndev) {
 866                         ret = -ENODEV;
 867                         goto out;
 868                 }
 869
 870                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t,
 871                                          n, ndev, 0);
 872                 if (!csk->l2t)
 873                         goto out;
 874                 csk->mtu = ndev->mtu;
 875                 csk->tx_chan = cxgb4_port_chan(ndev);
 876                 csk->smac_idx = cxgb4_tp_smt_idx(cdev->lldi.adapter_type,
 877                                                  cxgb4_port_viid(ndev));
 878                 step = cdev->lldi.ntxq /
 879                         cdev->lldi.nchan;
 880                 csk->txq_idx = cxgb4_port_idx(ndev) * step;
 881                 step = cdev->lldi.nrxq /
 882                         cdev->lldi.nchan;
 883                 csk->ctrlq_idx = cxgb4_port_idx(ndev);
 884                 csk->rss_qid = cdev->lldi.rxq_ids[
 885                                 cxgb4_port_idx(ndev) * step];
 886                 csk->port_id = cxgb4_port_idx(ndev);
 887                 cxgbit_set_tcp_window(csk,
 888                                       (struct port_info *)netdev_priv(ndev));
 889         } else {
 890                 ndev = cxgbit_get_real_dev(n->dev);
 891                 if (!ndev) {
 892                         ret = -ENODEV;
 893                         goto out;
 894                 }
 895
 896 #ifdef CONFIG_CHELSIO_T4_DCB
 897                 if (cxgbit_get_iscsi_dcb_state(ndev))
 898                         priority = cxgbit_get_iscsi_dcb_priority(ndev,
 899                                                                  local_port);
 900
 901                 csk->dcb_priority = priority;
 902
 903                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t, n, ndev, priority);
 904 #else
 905                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t, n, ndev, 0);
 906 #endif
 907                 if (!csk->l2t)
 908                         goto out;
 909                 port_id = cxgb4_port_idx(ndev);
 910                 csk->mtu = dst_mtu(dst);
 911                 csk->tx_chan = cxgb4_port_chan(ndev);
 912                 csk->smac_idx = cxgb4_tp_smt_idx(cdev->lldi.adapter_type,
 913                                                  cxgb4_port_viid(ndev));
 914                 step = cdev->lldi.ntxq /
 915                         cdev->lldi.nports;
 916                 csk->txq_idx = (port_id * step) +
 917                                 (cdev->selectq[port_id][0]++ % step);
 918                 csk->ctrlq_idx = cxgb4_port_idx(ndev);
 919                 step = cdev->lldi.nrxq /
 920                         cdev->lldi.nports;
 921                 rxq_idx = (port_id * step) +
 922                                 (cdev->selectq[port_id][1]++ % step);
 923                 csk->rss_qid = cdev->lldi.rxq_ids[rxq_idx];
 924                 csk->port_id = port_id;
 925                 cxgbit_set_tcp_window(csk,
 926                                       (struct port_info *)netdev_priv(ndev));
 927         }
 928         ret = 0;
 929 out:
 930         rcu_read_unlock();
 931         neigh_release(n);
 932         return ret;
 933 }
 934
 935 int cxgbit_ofld_send(struct cxgbit_device *cdev, struct sk_buff *skb)
 936 {
 937         int ret = 0;
 938
 939         if (!test_bit(CDEV_STATE_UP, &cdev->flags)) {
 940                 kfree_skb(skb);
 941                 pr_err("%s - device not up - dropping\n", __func__);
 942                 return -EIO;
 943         }
 944
 945         ret = cxgb4_ofld_send(cdev->lldi.ports[0], skb);
 946         if (ret < 0)
 947                 kfree_skb(skb);
 948         return ret < 0 ? ret : 0;
 949 }
 950
 951 static void cxgbit_release_tid(struct cxgbit_device *cdev, u32 tid)
 952 {
 953         u32 len = roundup(sizeof(struct cpl_tid_release), 16);
 954         struct sk_buff *skb;
 955
 956         skb = alloc_skb(len, GFP_ATOMIC);
 957         if (!skb)
 958                 return;
 959
 960         cxgb_mk_tid_release(skb, len, tid, 0);
 961         cxgbit_ofld_send(cdev, skb);
 962 }
 963
 964 int
 965 cxgbit_l2t_send(struct cxgbit_device *cdev, struct sk_buff *skb,
 966                 struct l2t_entry *l2e)
 967 {
 968         int ret = 0;
 969
 970         if (!test_bit(CDEV_STATE_UP, &cdev->flags)) {
 971                 kfree_skb(skb);
 972                 pr_err("%s - device not up - dropping\n", __func__);
 973                 return -EIO;
 974         }
 975
 976         ret = cxgb4_l2t_send(cdev->lldi.ports[0], skb, l2e);
 977         if (ret < 0)
 978                 kfree_skb(skb);
 979         return ret < 0 ? ret : 0;
 980 }
 981
 982 static void cxgbit_send_rx_credits(struct cxgbit_sock *csk, struct sk_buff *skb)
 983 {
 984         if (csk->com.state != CSK_STATE_ESTABLISHED) {
 985                 __kfree_skb(skb);
 986                 return;
 987         }
 988
 989         cxgbit_ofld_send(csk->com.cdev, skb);
 990 }
 991
 992 /*
 993  * CPL connection rx data ack: host ->
 994  * Send RX credits through an RX_DATA_ACK CPL message.
 995  * Returns the number of credits sent.
 996  */
 997 int cxgbit_rx_data_ack(struct cxgbit_sock *csk)
 998 {
 999         struct sk_buff *skb;
1000         u32 len = roundup(sizeof(struct cpl_rx_data_ack), 16);
1001         u32 credit_dack;
1002
1003         skb = alloc_skb(len, GFP_KERNEL);
1004         if (!skb)
1005                 return -1;
1006
1007         credit_dack = RX_DACK_CHANGE_F | RX_DACK_MODE_V(1) |
1008                       RX_CREDITS_V(csk->rx_credits);
1009
1010         cxgb_mk_rx_data_ack(skb, len, csk->tid, csk->ctrlq_idx,
1011                             credit_dack);
1012
1013         csk->rx_credits = 0;
1014
1015         spin_lock_bh(&csk->lock);
1016         if (csk->lock_owner) {
1017                 cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_send_rx_credits;
1018                 __skb_queue_tail(&csk->backlogq, skb);
1019                 spin_unlock_bh(&csk->lock);
1020                 return 0;
1021         }
1022
1023         cxgbit_send_rx_credits(csk, skb);
1024         spin_unlock_bh(&csk->lock);
1025
1026         return 0;
1027 }
1028
1029 #define FLOWC_WR_NPARAMS_MIN    9
1030 #define FLOWC_WR_NPARAMS_MAX    11
1031 static int cxgbit_alloc_csk_skb(struct cxgbit_sock *csk)
1032 {
1033         struct sk_buff *skb;
1034         u32 len, flowclen;
1035         u8 i;
1036
1037         flowclen = offsetof(struct fw_flowc_wr,
1038                             mnemval[FLOWC_WR_NPARAMS_MAX]);
1039
1040         len = max_t(u32, sizeof(struct cpl_abort_req),
1041                     sizeof(struct cpl_abort_rpl));
1042
1043         len = max(len, flowclen);
1044         len = roundup(len, 16);
1045
1046         for (i = 0; i < 3; i++) {
1047                 skb = alloc_skb(len, GFP_ATOMIC);
1048                 if (!skb)
1049                         goto out;
1050                 __skb_queue_tail(&csk->skbq, skb);
1051         }
1052
1053         skb = alloc_skb(LRO_SKB_MIN_HEADROOM, GFP_ATOMIC);
1054         if (!skb)
1055                 goto out;
1056
1057         memset(skb->data, 0, LRO_SKB_MIN_HEADROOM);
1058         csk->lro_hskb = skb;
1059
1060         return 0;
1061 out:
1062         __skb_queue_purge(&csk->skbq);
1063         return -ENOMEM;
1064 }
1065
1066 static void
1067 cxgbit_pass_accept_rpl(struct cxgbit_sock *csk, struct cpl_pass_accept_req *req)
1068 {
1069         struct sk_buff *skb;
1070         const struct tcphdr *tcph;
1071         struct cpl_t5_pass_accept_rpl *rpl5;
1072         struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
1073         unsigned int len = roundup(sizeof(*rpl5), 16);
1074         unsigned int mtu_idx;
1075         u64 opt0;
1076         u32 opt2, hlen;
1077         u32 wscale;
1078         u32 win;
1079
1080         pr_debug("%s csk %p tid %u\n", __func__, csk, csk->tid);
1081
1082         skb = alloc_skb(len, GFP_ATOMIC);
1083         if (!skb) {
1084                 cxgbit_put_csk(csk);
1085                 return;
1086         }
1087
1088         rpl5 = __skb_put_zero(skb, len);
1089
1090         INIT_TP_WR(rpl5, csk->tid);
1091         OPCODE_TID(rpl5) = cpu_to_be32(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL,
1092                                                      csk->tid));
1093         cxgb_best_mtu(csk->com.cdev->lldi.mtus, csk->mtu, &mtu_idx,
1094                       req->tcpopt.tstamp,
1095                       (csk->com.remote_addr.ss_family == AF_INET) ? 0 : 1);
1096         wscale = cxgb_compute_wscale(csk->rcv_win);
1097         /*
1098          * Specify the largest window that will fit in opt0. The
1099          * remainder will be specified in the rx_data_ack.
1100          */
1101         win = csk->rcv_win >> 10;
1102         if (win > RCV_BUFSIZ_M)
1103                 win = RCV_BUFSIZ_M;
1104         opt0 =  TCAM_BYPASS_F |
1105                 WND_SCALE_V(wscale) |
1106                 MSS_IDX_V(mtu_idx) |
1107                 L2T_IDX_V(csk->l2t->idx) |
1108                 TX_CHAN_V(csk->tx_chan) |
1109                 SMAC_SEL_V(csk->smac_idx) |
1110                 DSCP_V(csk->tos >> 2) |
1111                 ULP_MODE_V(ULP_MODE_ISCSI) |
1112                 RCV_BUFSIZ_V(win);
1113
1114         opt2 = RX_CHANNEL_V(0) |
1115                 RSS_QUEUE_VALID_F | RSS_QUEUE_V(csk->rss_qid);
1116
1117         if (!is_t5(lldi->adapter_type))
1118                 opt2 |= RX_FC_DISABLE_F;
1119
1120         if (req->tcpopt.tstamp)
1121                 opt2 |= TSTAMPS_EN_F;
1122         if (req->tcpopt.sack)
1123                 opt2 |= SACK_EN_F;
1124         if (wscale)
1125                 opt2 |= WND_SCALE_EN_F;
1126
1127         hlen = ntohl(req->hdr_len);
1128
1129         if (is_t5(lldi->adapter_type))
1130                 tcph = (struct tcphdr *)((u8 *)(req + 1) +
1131                        ETH_HDR_LEN_G(hlen) + IP_HDR_LEN_G(hlen));
1132         else
1133                 tcph = (struct tcphdr *)((u8 *)(req + 1) +
1134                        T6_ETH_HDR_LEN_G(hlen) + T6_IP_HDR_LEN_G(hlen));
1135
1136         if (tcph->ece && tcph->cwr)
1137                 opt2 |= CCTRL_ECN_V(1);
1138
1139         opt2 |= RX_COALESCE_V(3);
1140         opt2 |= CONG_CNTRL_V(CONG_ALG_NEWRENO);
1141
1142         opt2 |= T5_ISS_F;
1143         rpl5->iss = cpu_to_be32((prandom_u32() & ~7UL) - 1);
1144
1145         opt2 |= T5_OPT_2_VALID_F;
1146
1147         rpl5->opt0 = cpu_to_be64(opt0);
1148         rpl5->opt2 = cpu_to_be32(opt2);
1149         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->ctrlq_idx);
1150         t4_set_arp_err_handler(skb, NULL, cxgbit_arp_failure_discard);
1151         cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
1152 }
1153
1154 static void
1155 cxgbit_pass_accept_req(struct cxgbit_device *cdev, struct sk_buff *skb)
1156 {
1157         struct cxgbit_sock *csk = NULL;
1158         struct cxgbit_np *cnp;
1159         struct cpl_pass_accept_req *req = cplhdr(skb);
1160         unsigned int stid = PASS_OPEN_TID_G(ntohl(req->tos_stid));
1161         struct tid_info *t = cdev->lldi.tids;
1162         unsigned int tid = GET_TID(req);
1163         u16 peer_mss = ntohs(req->tcpopt.mss);
1164         unsigned short hdrs;
1165
1166         struct dst_entry *dst;
1167         __u8 local_ip[16], peer_ip[16];
1168         __be16 local_port, peer_port;
1169         int ret;
1170         int iptype;
1171
1172         pr_debug("%s: cdev = %p; stid = %u; tid = %u\n",
1173                  __func__, cdev, stid, tid);
1174
1175         cnp = lookup_stid(t, stid);
1176         if (!cnp) {
1177                 pr_err("%s connect request on invalid stid %d\n",
1178                        __func__, stid);
1179                 goto rel_skb;
1180         }
1181
1182         if (cnp->com.state != CSK_STATE_LISTEN) {
1183                 pr_err("%s - listening parent not in CSK_STATE_LISTEN\n",
1184                        __func__);
1185                 goto reject;
1186         }
1187
1188         csk = lookup_tid(t, tid);
1189         if (csk) {
1190                 pr_err("%s csk not null tid %u\n",
1191                        __func__, tid);
1192                 goto rel_skb;
1193         }
1194
1195         cxgb_get_4tuple(req, cdev->lldi.adapter_type, &iptype, local_ip,
1196                         peer_ip, &local_port, &peer_port);
1197
1198         /* Find output route */
1199         if (iptype == 4)  {
1200                 pr_debug("%s parent sock %p tid %u laddr %pI4 raddr %pI4 "
1201                          "lport %d rport %d peer_mss %d\n"
1202                          , __func__, cnp, tid,
1203                          local_ip, peer_ip, ntohs(local_port),
1204                          ntohs(peer_port), peer_mss);
1205                 dst = cxgb_find_route(&cdev->lldi, cxgbit_get_real_dev,
1206                                       *(__be32 *)local_ip,
1207                                       *(__be32 *)peer_ip,
1208                                       local_port, peer_port,
1209                                       PASS_OPEN_TOS_G(ntohl(req->tos_stid)));
1210         } else {
1211                 pr_debug("%s parent sock %p tid %u laddr %pI6 raddr %pI6 "
1212                          "lport %d rport %d peer_mss %d\n"
1213                          , __func__, cnp, tid,
1214                          local_ip, peer_ip, ntohs(local_port),
1215                          ntohs(peer_port), peer_mss);
1216                 dst = cxgb_find_route6(&cdev->lldi, cxgbit_get_real_dev,
1217                                        local_ip, peer_ip,
1218                                        local_port, peer_port,
1219                                        PASS_OPEN_TOS_G(ntohl(req->tos_stid)),
1220                                        ((struct sockaddr_in6 *)
1221                                         &cnp->com.local_addr)->sin6_scope_id);
1222         }
1223         if (!dst) {
1224                 pr_err("%s - failed to find dst entry!\n",
1225                        __func__);
1226                 goto reject;
1227         }
1228
1229         csk = kzalloc(sizeof(*csk), GFP_ATOMIC);
1230         if (!csk) {
1231                 dst_release(dst);
1232                 goto rel_skb;
1233         }
1234
1235         ret = cxgbit_offload_init(csk, iptype, peer_ip, ntohs(local_port),
1236                                   dst, cdev);
1237         if (ret) {
1238                 pr_err("%s - failed to allocate l2t entry!\n",
1239                        __func__);
1240                 dst_release(dst);
1241                 kfree(csk);
1242                 goto reject;
1243         }
1244
1245         kref_init(&csk->kref);
1246         init_completion(&csk->com.wr_wait.completion);
1247
1248         INIT_LIST_HEAD(&csk->accept_node);
1249
1250         hdrs = (iptype == 4 ? sizeof(struct iphdr) : sizeof(struct ipv6hdr)) +
1251                 sizeof(struct tcphdr) + (req->tcpopt.tstamp ? 12 : 0);
1252         if (peer_mss && csk->mtu > (peer_mss + hdrs))
1253                 csk->mtu = peer_mss + hdrs;
1254
1255         csk->com.state = CSK_STATE_CONNECTING;
1256         csk->com.cdev = cdev;
1257         csk->cnp = cnp;
1258         csk->tos = PASS_OPEN_TOS_G(ntohl(req->tos_stid));
1259         csk->dst = dst;
1260         csk->tid = tid;
1261         csk->wr_cred = cdev->lldi.wr_cred -
1262                         DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1263         csk->wr_max_cred = csk->wr_cred;
1264         csk->wr_una_cred = 0;
1265
1266         if (iptype == 4) {
1267                 struct sockaddr_in *sin = (struct sockaddr_in *)
1268                                           &csk->com.local_addr;
1269                 sin->sin_family = AF_INET;
1270                 sin->sin_port = local_port;
1271                 sin->sin_addr.s_addr = *(__be32 *)local_ip;
1272
1273                 sin = (struct sockaddr_in *)&csk->com.remote_addr;
1274                 sin->sin_family = AF_INET;
1275                 sin->sin_port = peer_port;
1276                 sin->sin_addr.s_addr = *(__be32 *)peer_ip;
1277         } else {
1278                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
1279                                             &csk->com.local_addr;
1280
1281                 sin6->sin6_family = PF_INET6;
1282                 sin6->sin6_port = local_port;
1283                 memcpy(sin6->sin6_addr.s6_addr, local_ip, 16);
1284                 cxgb4_clip_get(cdev->lldi.ports[0],
1285                                (const u32 *)&sin6->sin6_addr.s6_addr,
1286                                1);
1287
1288                 sin6 = (struct sockaddr_in6 *)&csk->com.remote_addr;
1289                 sin6->sin6_family = PF_INET6;
1290                 sin6->sin6_port = peer_port;
1291                 memcpy(sin6->sin6_addr.s6_addr, peer_ip, 16);
1292         }
1293
1294         skb_queue_head_init(&csk->rxq);
1295         skb_queue_head_init(&csk->txq);
1296         skb_queue_head_init(&csk->ppodq);
1297         skb_queue_head_init(&csk->backlogq);
1298         skb_queue_head_init(&csk->skbq);
1299         cxgbit_sock_reset_wr_list(csk);
1300         spin_lock_init(&csk->lock);
1301         init_waitqueue_head(&csk->waitq);
1302         init_waitqueue_head(&csk->ack_waitq);
1303         csk->lock_owner = false;
1304
1305         if (cxgbit_alloc_csk_skb(csk)) {
1306                 dst_release(dst);
1307                 kfree(csk);
1308                 goto rel_skb;
1309         }
1310
1311         cxgbit_get_cdev(cdev);
1312
1313         spin_lock(&cdev->cskq.lock);
1314         list_add_tail(&csk->list, &cdev->cskq.list);
1315         spin_unlock(&cdev->cskq.lock);
1316         cxgb4_insert_tid(t, csk, tid, csk->com.local_addr.ss_family);
1317         cxgbit_pass_accept_rpl(csk, req);
1318         goto rel_skb;
1319
1320 reject:
1321         cxgbit_release_tid(cdev, tid);
1322 rel_skb:
1323         __kfree_skb(skb);
1324 }
1325
1326 static u32
1327 cxgbit_tx_flowc_wr_credits(struct cxgbit_sock *csk, u32 *nparamsp,
1328                            u32 *flowclenp)
1329 {
1330         u32 nparams, flowclen16, flowclen;
1331
1332         nparams = FLOWC_WR_NPARAMS_MIN;
1333
1334         if (csk->snd_wscale)
1335                 nparams++;
1336
1337 #ifdef CONFIG_CHELSIO_T4_DCB
1338         nparams++;
1339 #endif
1340         flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
1341         flowclen16 = DIV_ROUND_UP(flowclen, 16);
1342         flowclen = flowclen16 * 16;
1343         /*
1344          * Return the number of 16-byte credits used by the flowc request.
1345          * Pass back the nparams and actual flowc length if requested.
1346          */
1347         if (nparamsp)
1348                 *nparamsp = nparams;
1349         if (flowclenp)
1350                 *flowclenp = flowclen;
1351         return flowclen16;
1352 }
1353
1354 u32 cxgbit_send_tx_flowc_wr(struct cxgbit_sock *csk)
1355 {
1356         struct cxgbit_device *cdev = csk->com.cdev;
1357         struct fw_flowc_wr *flowc;
1358         u32 nparams, flowclen16, flowclen;
1359         struct sk_buff *skb;
1360         u8 index;
1361
1362 #ifdef CONFIG_CHELSIO_T4_DCB
1363         u16 vlan = ((struct l2t_entry *)csk->l2t)->vlan;
1364 #endif
1365
1366         flowclen16 = cxgbit_tx_flowc_wr_credits(csk, &nparams, &flowclen);
1367
1368         skb = __skb_dequeue(&csk->skbq);
1369         flowc = __skb_put_zero(skb, flowclen);
1370
1371         flowc->op_to_nparams = cpu_to_be32(FW_WR_OP_V(FW_FLOWC_WR) |
1372                                            FW_FLOWC_WR_NPARAMS_V(nparams));
1373         flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(flowclen16) |
1374                                           FW_WR_FLOWID_V(csk->tid));
1375         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
1376         flowc->mnemval[0].val = cpu_to_be32(FW_PFVF_CMD_PFN_V
1377                                             (csk->com.cdev->lldi.pf));
1378         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
1379         flowc->mnemval[1].val = cpu_to_be32(csk->tx_chan);
1380         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
1381         flowc->mnemval[2].val = cpu_to_be32(csk->tx_chan);
1382         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
1383         flowc->mnemval[3].val = cpu_to_be32(csk->rss_qid);
1384         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
1385         flowc->mnemval[4].val = cpu_to_be32(csk->snd_nxt);
1386         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
1387         flowc->mnemval[5].val = cpu_to_be32(csk->rcv_nxt);
1388         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
1389         flowc->mnemval[6].val = cpu_to_be32(csk->snd_win);
1390         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
1391         flowc->mnemval[7].val = cpu_to_be32(csk->emss);
1392
1393         flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
1394         if (test_bit(CDEV_ISO_ENABLE, &cdev->flags))
1395                 flowc->mnemval[8].val = cpu_to_be32(CXGBIT_MAX_ISO_PAYLOAD);
1396         else
1397                 flowc->mnemval[8].val = cpu_to_be32(16384);
1398
1399         index = 9;
1400
1401         if (csk->snd_wscale) {
1402                 flowc->mnemval[index].mnemonic = FW_FLOWC_MNEM_RCV_SCALE;
1403                 flowc->mnemval[index].val = cpu_to_be32(csk->snd_wscale);
1404                 index++;
1405         }
1406
1407 #ifdef CONFIG_CHELSIO_T4_DCB
1408         flowc->mnemval[index].mnemonic = FW_FLOWC_MNEM_DCBPRIO;
1409         if (vlan == VLAN_NONE) {
1410                 pr_warn("csk %u without VLAN Tag on DCB Link\n", csk->tid);
1411                 flowc->mnemval[index].val = cpu_to_be32(0);
1412         } else
1413                 flowc->mnemval[index].val = cpu_to_be32(
1414                                 (vlan & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT);
1415 #endif
1416
1417         pr_debug("%s: csk %p; tx_chan = %u; rss_qid = %u; snd_seq = %u;"
1418                  " rcv_seq = %u; snd_win = %u; emss = %u\n",
1419                  __func__, csk, csk->tx_chan, csk->rss_qid, csk->snd_nxt,
1420                  csk->rcv_nxt, csk->snd_win, csk->emss);
1421         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx);
1422         cxgbit_ofld_send(csk->com.cdev, skb);
1423         return flowclen16;
1424 }
1425
1426 int cxgbit_setup_conn_digest(struct cxgbit_sock *csk)
1427 {
1428         struct sk_buff *skb;
1429         struct cpl_set_tcb_field *req;
1430         u8 hcrc = csk->submode & CXGBIT_SUBMODE_HCRC;
1431         u8 dcrc = csk->submode & CXGBIT_SUBMODE_DCRC;
1432         unsigned int len = roundup(sizeof(*req), 16);
1433         int ret;
1434
1435         skb = alloc_skb(len, GFP_KERNEL);
1436         if (!skb)
1437                 return -ENOMEM;
1438
1439         /*  set up ulp submode */
1440         req = __skb_put_zero(skb, len);
1441
1442         INIT_TP_WR(req, csk->tid);
1443         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1444         req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
1445         req->word_cookie = htons(0);
1446         req->mask = cpu_to_be64(0x3 << 4);
1447         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1448                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1449         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->ctrlq_idx);
1450
1451         cxgbit_get_csk(csk);
1452         cxgbit_init_wr_wait(&csk->com.wr_wait);
1453
1454         cxgbit_ofld_send(csk->com.cdev, skb);
1455
1456         ret = cxgbit_wait_for_reply(csk->com.cdev,
1457                                     &csk->com.wr_wait,
1458                                     csk->tid, 5, __func__);
1459         if (ret)
1460                 return -1;
1461
1462         return 0;
1463 }
1464
1465 int cxgbit_setup_conn_pgidx(struct cxgbit_sock *csk, u32 pg_idx)
1466 {
1467         struct sk_buff *skb;
1468         struct cpl_set_tcb_field *req;
1469         unsigned int len = roundup(sizeof(*req), 16);
1470         int ret;
1471
1472         skb = alloc_skb(len, GFP_KERNEL);
1473         if (!skb)
1474                 return -ENOMEM;
1475
1476         req = __skb_put_zero(skb, len);
1477
1478         INIT_TP_WR(req, csk->tid);
1479         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1480         req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
1481         req->word_cookie = htons(0);
1482         req->mask = cpu_to_be64(0x3 << 8);
1483         req->val = cpu_to_be64(pg_idx << 8);
1484         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->ctrlq_idx);
1485
1486         cxgbit_get_csk(csk);
1487         cxgbit_init_wr_wait(&csk->com.wr_wait);
1488
1489         cxgbit_ofld_send(csk->com.cdev, skb);
1490
1491         ret = cxgbit_wait_for_reply(csk->com.cdev,
1492                                     &csk->com.wr_wait,
1493                                     csk->tid, 5, __func__);
1494         if (ret)
1495                 return -1;
1496
1497         return 0;
1498 }
1499
1500 static void
1501 cxgbit_pass_open_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1502 {
1503         struct cpl_pass_open_rpl *rpl = cplhdr(skb);
1504         struct tid_info *t = cdev->lldi.tids;
1505         unsigned int stid = GET_TID(rpl);
1506         struct cxgbit_np *cnp = lookup_stid(t, stid);
1507
1508         pr_debug("%s: cnp = %p; stid = %u; status = %d\n",
1509                  __func__, cnp, stid, rpl->status);
1510
1511         if (!cnp) {
1512                 pr_info("%s stid %d lookup failure\n", __func__, stid);
1513                 goto rel_skb;
1514         }
1515
1516         cxgbit_wake_up(&cnp->com.wr_wait, __func__, rpl->status);
1517         cxgbit_put_cnp(cnp);
1518 rel_skb:
1519         __kfree_skb(skb);
1520 }
1521
1522 static void
1523 cxgbit_close_listsrv_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1524 {
1525         struct cpl_close_listsvr_rpl *rpl = cplhdr(skb);
1526         struct tid_info *t = cdev->lldi.tids;
1527         unsigned int stid = GET_TID(rpl);
1528         struct cxgbit_np *cnp = lookup_stid(t, stid);
1529
1530         pr_debug("%s: cnp = %p; stid = %u; status = %d\n",
1531                  __func__, cnp, stid, rpl->status);
1532
1533         if (!cnp) {
1534                 pr_info("%s stid %d lookup failure\n", __func__, stid);
1535                 goto rel_skb;
1536         }
1537
1538         cxgbit_wake_up(&cnp->com.wr_wait, __func__, rpl->status);
1539         cxgbit_put_cnp(cnp);
1540 rel_skb:
1541         __kfree_skb(skb);
1542 }
1543
1544 static void
1545 cxgbit_pass_establish(struct cxgbit_device *cdev, struct sk_buff *skb)
1546 {
1547         struct cpl_pass_establish *req = cplhdr(skb);
1548         struct tid_info *t = cdev->lldi.tids;
1549         unsigned int tid = GET_TID(req);
1550         struct cxgbit_sock *csk;
1551         struct cxgbit_np *cnp;
1552         u16 tcp_opt = be16_to_cpu(req->tcp_opt);
1553         u32 snd_isn = be32_to_cpu(req->snd_isn);
1554         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
1555
1556         csk = lookup_tid(t, tid);
1557         if (unlikely(!csk)) {
1558                 pr_err("can't find connection for tid %u.\n", tid);
1559                 goto rel_skb;
1560         }
1561         cnp = csk->cnp;
1562
1563         pr_debug("%s: csk %p; tid %u; cnp %p\n",
1564                  __func__, csk, tid, cnp);
1565
1566         csk->write_seq = snd_isn;
1567         csk->snd_una = snd_isn;
1568         csk->snd_nxt = snd_isn;
1569
1570         csk->rcv_nxt = rcv_isn;
1571
1572         if (csk->rcv_win > (RCV_BUFSIZ_M << 10))
1573                 csk->rx_credits = (csk->rcv_win - (RCV_BUFSIZ_M << 10));
1574
1575         csk->snd_wscale = TCPOPT_SND_WSCALE_G(tcp_opt);
1576         cxgbit_set_emss(csk, tcp_opt);
1577         dst_confirm(csk->dst);
1578         csk->com.state = CSK_STATE_ESTABLISHED;
1579         spin_lock_bh(&cnp->np_accept_lock);
1580         list_add_tail(&csk->accept_node, &cnp->np_accept_list);
1581         spin_unlock_bh(&cnp->np_accept_lock);
1582         complete(&cnp->accept_comp);
1583 rel_skb:
1584         __kfree_skb(skb);
1585 }
1586
1587 static void cxgbit_queue_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1588 {
1589         cxgbit_skcb_flags(skb) = 0;
1590         spin_lock_bh(&csk->rxq.lock);
1591         __skb_queue_tail(&csk->rxq, skb);
1592         spin_unlock_bh(&csk->rxq.lock);
1593         wake_up(&csk->waitq);
1594 }
1595
1596 static void cxgbit_peer_close(struct cxgbit_sock *csk, struct sk_buff *skb)
1597 {
1598         pr_debug("%s: csk %p; tid %u; state %d\n",
1599                  __func__, csk, csk->tid, csk->com.state);
1600
1601         switch (csk->com.state) {
1602         case CSK_STATE_ESTABLISHED:
1603                 csk->com.state = CSK_STATE_CLOSING;
1604                 cxgbit_queue_rx_skb(csk, skb);
1605                 return;
1606         case CSK_STATE_CLOSING:
1607                 /* simultaneous close */
1608                 csk->com.state = CSK_STATE_MORIBUND;
1609                 break;
1610         case CSK_STATE_MORIBUND:
1611                 csk->com.state = CSK_STATE_DEAD;
1612                 cxgbit_put_csk(csk);
1613                 break;
1614         case CSK_STATE_ABORTING:
1615                 break;
1616         default:
1617                 pr_info("%s: cpl_peer_close in bad state %d\n",
1618                         __func__, csk->com.state);
1619         }
1620
1621         __kfree_skb(skb);
1622 }
1623
1624 static void cxgbit_close_con_rpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1625 {
1626         pr_debug("%s: csk %p; tid %u; state %d\n",
1627                  __func__, csk, csk->tid, csk->com.state);
1628
1629         switch (csk->com.state) {
1630         case CSK_STATE_CLOSING:
1631                 csk->com.state = CSK_STATE_MORIBUND;
1632                 break;
1633         case CSK_STATE_MORIBUND:
1634                 csk->com.state = CSK_STATE_DEAD;
1635                 cxgbit_put_csk(csk);
1636                 break;
1637         case CSK_STATE_ABORTING:
1638         case CSK_STATE_DEAD:
1639                 break;
1640         default:
1641                 pr_info("%s: cpl_close_con_rpl in bad state %d\n",
1642                         __func__, csk->com.state);
1643         }
1644
1645         __kfree_skb(skb);
1646 }
1647
1648 static void cxgbit_abort_req_rss(struct cxgbit_sock *csk, struct sk_buff *skb)
1649 {
1650         struct cpl_abort_req_rss *hdr = cplhdr(skb);
1651         unsigned int tid = GET_TID(hdr);
1652         struct sk_buff *rpl_skb;
1653         bool release = false;
1654         bool wakeup_thread = false;
1655         u32 len = roundup(sizeof(struct cpl_abort_rpl), 16);
1656
1657         pr_debug("%s: csk %p; tid %u; state %d\n",
1658                  __func__, csk, tid, csk->com.state);
1659
1660         if (cxgb_is_neg_adv(hdr->status)) {
1661                 pr_err("%s: got neg advise %d on tid %u\n",
1662                        __func__, hdr->status, tid);
1663                 goto rel_skb;
1664         }
1665
1666         switch (csk->com.state) {
1667         case CSK_STATE_CONNECTING:
1668         case CSK_STATE_MORIBUND:
1669                 csk->com.state = CSK_STATE_DEAD;
1670                 release = true;
1671                 break;
1672         case CSK_STATE_ESTABLISHED:
1673                 csk->com.state = CSK_STATE_DEAD;
1674                 wakeup_thread = true;
1675                 break;
1676         case CSK_STATE_CLOSING:
1677                 csk->com.state = CSK_STATE_DEAD;
1678                 if (!csk->conn)
1679                         release = true;
1680                 break;
1681         case CSK_STATE_ABORTING:
1682                 break;
1683         default:
1684                 pr_info("%s: cpl_abort_req_rss in bad state %d\n",
1685                         __func__, csk->com.state);
1686                 csk->com.state = CSK_STATE_DEAD;
1687         }
1688
1689         __skb_queue_purge(&csk->txq);
1690
1691         if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags))
1692                 cxgbit_send_tx_flowc_wr(csk);
1693
1694         rpl_skb = __skb_dequeue(&csk->skbq);
1695
1696         cxgb_mk_abort_rpl(rpl_skb, len, csk->tid, csk->txq_idx);
1697         cxgbit_ofld_send(csk->com.cdev, rpl_skb);
1698
1699         if (wakeup_thread) {
1700                 cxgbit_queue_rx_skb(csk, skb);
1701                 return;
1702         }
1703
1704         if (release)
1705                 cxgbit_put_csk(csk);
1706 rel_skb:
1707         __kfree_skb(skb);
1708 }
1709
1710 static void cxgbit_abort_rpl_rss(struct cxgbit_sock *csk, struct sk_buff *skb)
1711 {
1712         pr_debug("%s: csk %p; tid %u; state %d\n",
1713                  __func__, csk, csk->tid, csk->com.state);
1714
1715         switch (csk->com.state) {
1716         case CSK_STATE_ABORTING:
1717                 csk->com.state = CSK_STATE_DEAD;
1718                 cxgbit_put_csk(csk);
1719                 break;
1720         default:
1721                 pr_info("%s: cpl_abort_rpl_rss in state %d\n",
1722                         __func__, csk->com.state);
1723         }
1724
1725         __kfree_skb(skb);
1726 }
1727
1728 static bool cxgbit_credit_err(const struct cxgbit_sock *csk)
1729 {
1730         const struct sk_buff *skb = csk->wr_pending_head;
1731         u32 credit = 0;
1732
1733         if (unlikely(csk->wr_cred > csk->wr_max_cred)) {
1734                 pr_err("csk 0x%p, tid %u, credit %u > %u\n",
1735                        csk, csk->tid, csk->wr_cred, csk->wr_max_cred);
1736                 return true;
1737         }
1738
1739         while (skb) {
1740                 credit += (__force u32)skb->csum;
1741                 skb = cxgbit_skcb_tx_wr_next(skb);
1742         }
1743
1744         if (unlikely((csk->wr_cred + credit) != csk->wr_max_cred)) {
1745                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1746                        csk, csk->tid, csk->wr_cred,
1747                        credit, csk->wr_max_cred);
1748
1749                 return true;
1750         }
1751
1752         return false;
1753 }
1754
1755 static void cxgbit_fw4_ack(struct cxgbit_sock *csk, struct sk_buff *skb)
1756 {
1757         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)cplhdr(skb);
1758         u32 credits = rpl->credits;
1759         u32 snd_una = ntohl(rpl->snd_una);
1760
1761         csk->wr_cred += credits;
1762         if (csk->wr_una_cred > (csk->wr_max_cred - csk->wr_cred))
1763                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1764
1765         while (credits) {
1766                 struct sk_buff *p = cxgbit_sock_peek_wr(csk);
1767                 const u32 csum = (__force u32)p->csum;
1768
1769                 if (unlikely(!p)) {
1770                         pr_err("csk 0x%p,%u, cr %u,%u+%u, empty.\n",
1771                                csk, csk->tid, credits,
1772                                csk->wr_cred, csk->wr_una_cred);
1773                         break;
1774                 }
1775
1776                 if (unlikely(credits < csum)) {
1777                         pr_warn("csk 0x%p,%u, cr %u,%u+%u, < %u.\n",
1778                                 csk,  csk->tid,
1779                                 credits, csk->wr_cred, csk->wr_una_cred,
1780                                 csum);
1781                         p->csum = (__force __wsum)(csum - credits);
1782                         break;
1783                 }
1784
1785                 cxgbit_sock_dequeue_wr(csk);
1786                 credits -= csum;
1787                 kfree_skb(p);
1788         }
1789
1790         if (unlikely(cxgbit_credit_err(csk))) {
1791                 cxgbit_queue_rx_skb(csk, skb);
1792                 return;
1793         }
1794
1795         if (rpl->seq_vld & CPL_FW4_ACK_FLAGS_SEQVAL) {
1796                 if (unlikely(before(snd_una, csk->snd_una))) {
1797                         pr_warn("csk 0x%p,%u, snd_una %u/%u.",
1798                                 csk, csk->tid, snd_una,
1799                                 csk->snd_una);
1800                         goto rel_skb;
1801                 }
1802
1803                 if (csk->snd_una != snd_una) {
1804                         csk->snd_una = snd_una;
1805                         dst_confirm(csk->dst);
1806                         wake_up(&csk->ack_waitq);
1807                 }
1808         }
1809
1810         if (skb_queue_len(&csk->txq))
1811                 cxgbit_push_tx_frames(csk);
1812
1813 rel_skb:
1814         __kfree_skb(skb);
1815 }
1816
1817 static void cxgbit_set_tcb_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1818 {
1819         struct cxgbit_sock *csk;
1820         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1821         unsigned int tid = GET_TID(rpl);
1822         struct cxgb4_lld_info *lldi = &cdev->lldi;
1823         struct tid_info *t = lldi->tids;
1824
1825         csk = lookup_tid(t, tid);
1826         if (unlikely(!csk)) {
1827                 pr_err("can't find connection for tid %u.\n", tid);
1828                 goto rel_skb;
1829         } else {
1830                 cxgbit_wake_up(&csk->com.wr_wait, __func__, rpl->status);
1831         }
1832
1833         cxgbit_put_csk(csk);
1834 rel_skb:
1835         __kfree_skb(skb);
1836 }
1837
1838 static void cxgbit_rx_data(struct cxgbit_device *cdev, struct sk_buff *skb)
1839 {
1840         struct cxgbit_sock *csk;
1841         struct cpl_rx_data *cpl = cplhdr(skb);
1842         unsigned int tid = GET_TID(cpl);
1843         struct cxgb4_lld_info *lldi = &cdev->lldi;
1844         struct tid_info *t = lldi->tids;
1845
1846         csk = lookup_tid(t, tid);
1847         if (unlikely(!csk)) {
1848                 pr_err("can't find conn. for tid %u.\n", tid);
1849                 goto rel_skb;
1850         }
1851
1852         cxgbit_queue_rx_skb(csk, skb);
1853         return;
1854 rel_skb:
1855         __kfree_skb(skb);
1856 }
1857
1858 static void
1859 __cxgbit_process_rx_cpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1860 {
1861         spin_lock(&csk->lock);
1862         if (csk->lock_owner) {
1863                 __skb_queue_tail(&csk->backlogq, skb);
1864                 spin_unlock(&csk->lock);
1865                 return;
1866         }
1867
1868         cxgbit_skcb_rx_backlog_fn(skb)(csk, skb);
1869         spin_unlock(&csk->lock);
1870 }
1871
1872 static void cxgbit_process_rx_cpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1873 {
1874         cxgbit_get_csk(csk);
1875         __cxgbit_process_rx_cpl(csk, skb);
1876         cxgbit_put_csk(csk);
1877 }
1878
1879 static void cxgbit_rx_cpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1880 {
1881         struct cxgbit_sock *csk;
1882         struct cpl_tx_data *cpl = cplhdr(skb);
1883         struct cxgb4_lld_info *lldi = &cdev->lldi;
1884         struct tid_info *t = lldi->tids;
1885         unsigned int tid = GET_TID(cpl);
1886         u8 opcode = cxgbit_skcb_rx_opcode(skb);
1887         bool ref = true;
1888
1889         switch (opcode) {
1890         case CPL_FW4_ACK:
1891                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_fw4_ack;
1892                         ref = false;
1893                         break;
1894         case CPL_PEER_CLOSE:
1895                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_peer_close;
1896                         break;
1897         case CPL_CLOSE_CON_RPL:
1898                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_close_con_rpl;
1899                         break;
1900         case CPL_ABORT_REQ_RSS:
1901                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_abort_req_rss;
1902                         break;
1903         case CPL_ABORT_RPL_RSS:
1904                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_abort_rpl_rss;
1905                         break;
1906         default:
1907                 goto rel_skb;
1908         }
1909
1910         csk = lookup_tid(t, tid);
1911         if (unlikely(!csk)) {
1912                 pr_err("can't find conn. for tid %u.\n", tid);
1913                 goto rel_skb;
1914         }
1915
1916         if (ref)
1917                 cxgbit_process_rx_cpl(csk, skb);
1918         else
1919                 __cxgbit_process_rx_cpl(csk, skb);
1920
1921         return;
1922 rel_skb:
1923         __kfree_skb(skb);
1924 }
1925
1926 cxgbit_cplhandler_func cxgbit_cplhandlers[NUM_CPL_CMDS] = {
1927         [CPL_PASS_OPEN_RPL]     = cxgbit_pass_open_rpl,
1928         [CPL_CLOSE_LISTSRV_RPL] = cxgbit_close_listsrv_rpl,
1929         [CPL_PASS_ACCEPT_REQ]   = cxgbit_pass_accept_req,
1930         [CPL_PASS_ESTABLISH]    = cxgbit_pass_establish,
1931         [CPL_SET_TCB_RPL]       = cxgbit_set_tcb_rpl,
1932         [CPL_RX_DATA]           = cxgbit_rx_data,
1933         [CPL_FW4_ACK]           = cxgbit_rx_cpl,
1934         [CPL_PEER_CLOSE]        = cxgbit_rx_cpl,
1935         [CPL_CLOSE_CON_RPL]     = cxgbit_rx_cpl,
1936         [CPL_ABORT_REQ_RSS]     = cxgbit_rx_cpl,
1937         [CPL_ABORT_RPL_RSS]     = cxgbit_rx_cpl,
1938 };