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         dst_release(csk->dst);
 757         cxgb4_l2t_release(csk->l2t);
 758
 759         cdev = csk->com.cdev;
 760         spin_lock_bh(&cdev->cskq.lock);
 761         list_del(&csk->list);
 762         spin_unlock_bh(&cdev->cskq.lock);
 763
 764         cxgbit_free_skb(csk);
 765         cxgbit_put_cdev(cdev);
 766
 767         kfree(csk);
 768 }
 769
 770 static void cxgbit_set_tcp_window(struct cxgbit_sock *csk, struct port_info *pi)
 771 {
 772         unsigned int linkspeed;
 773         u8 scale;
 774
 775         linkspeed = pi->link_cfg.speed;
 776         scale = linkspeed / SPEED_10000;
 777
 778 #define CXGBIT_10G_RCV_WIN (256 * 1024)
 779         csk->rcv_win = CXGBIT_10G_RCV_WIN;
 780         if (scale)
 781                 csk->rcv_win *= scale;
 782
 783 #define CXGBIT_10G_SND_WIN (256 * 1024)
 784         csk->snd_win = CXGBIT_10G_SND_WIN;
 785         if (scale)
 786                 csk->snd_win *= scale;
 787
 788         pr_debug("%s snd_win %d rcv_win %d\n",
 789                  __func__, csk->snd_win, csk->rcv_win);
 790 }
 791
 792 #ifdef CONFIG_CHELSIO_T4_DCB
 793 static u8 cxgbit_get_iscsi_dcb_state(struct net_device *ndev)
 794 {
 795         return ndev->dcbnl_ops->getstate(ndev);
 796 }
 797
 798 static int cxgbit_select_priority(int pri_mask)
 799 {
 800         if (!pri_mask)
 801                 return 0;
 802
 803         return (ffs(pri_mask) - 1);
 804 }
 805
 806 static u8 cxgbit_get_iscsi_dcb_priority(struct net_device *ndev, u16 local_port)
 807 {
 808         int ret;
 809         u8 caps;
 810
 811         struct dcb_app iscsi_dcb_app = {
 812                 .protocol = local_port
 813         };
 814
 815         ret = (int)ndev->dcbnl_ops->getcap(ndev, DCB_CAP_ATTR_DCBX, &caps);
 816
 817         if (ret)
 818                 return 0;
 819
 820         if (caps & DCB_CAP_DCBX_VER_IEEE) {
 821                 iscsi_dcb_app.selector = IEEE_8021QAZ_APP_SEL_ANY;
 822
 823                 ret = dcb_ieee_getapp_mask(ndev, &iscsi_dcb_app);
 824
 825         } else if (caps & DCB_CAP_DCBX_VER_CEE) {
 826                 iscsi_dcb_app.selector = DCB_APP_IDTYPE_PORTNUM;
 827
 828                 ret = dcb_getapp(ndev, &iscsi_dcb_app);
 829         }
 830
 831         pr_info("iSCSI priority is set to %u\n", cxgbit_select_priority(ret));
 832
 833         return cxgbit_select_priority(ret);
 834 }
 835 #endif
 836
 837 static int
 838 cxgbit_offload_init(struct cxgbit_sock *csk, int iptype, __u8 *peer_ip,
 839                     u16 local_port, struct dst_entry *dst,
 840                     struct cxgbit_device *cdev)
 841 {
 842         struct neighbour *n;
 843         int ret, step;
 844         struct net_device *ndev;
 845         u16 rxq_idx, port_id;
 846 #ifdef CONFIG_CHELSIO_T4_DCB
 847         u8 priority = 0;
 848 #endif
 849
 850         n = dst_neigh_lookup(dst, peer_ip);
 851         if (!n)
 852                 return -ENODEV;
 853
 854         rcu_read_lock();
 855         ret = -ENOMEM;
 856         if (n->dev->flags & IFF_LOOPBACK) {
 857                 if (iptype == 4)
 858                         ndev = cxgbit_ipv4_netdev(*(__be32 *)peer_ip);
 859                 else if (IS_ENABLED(CONFIG_IPV6))
 860                         ndev = cxgbit_ipv6_netdev((struct in6_addr *)peer_ip);
 861                 else
 862                         ndev = NULL;
 863
 864                 if (!ndev) {
 865                         ret = -ENODEV;
 866                         goto out;
 867                 }
 868
 869                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t,
 870                                          n, ndev, 0);
 871                 if (!csk->l2t)
 872                         goto out;
 873                 csk->mtu = ndev->mtu;
 874                 csk->tx_chan = cxgb4_port_chan(ndev);
 875                 csk->smac_idx = (cxgb4_port_viid(ndev) & 0x7F) << 1;
 876                 step = cdev->lldi.ntxq /
 877                         cdev->lldi.nchan;
 878                 csk->txq_idx = cxgb4_port_idx(ndev) * step;
 879                 step = cdev->lldi.nrxq /
 880                         cdev->lldi.nchan;
 881                 csk->ctrlq_idx = cxgb4_port_idx(ndev);
 882                 csk->rss_qid = cdev->lldi.rxq_ids[
 883                                 cxgb4_port_idx(ndev) * step];
 884                 csk->port_id = cxgb4_port_idx(ndev);
 885                 cxgbit_set_tcp_window(csk,
 886                                       (struct port_info *)netdev_priv(ndev));
 887         } else {
 888                 ndev = cxgbit_get_real_dev(n->dev);
 889                 if (!ndev) {
 890                         ret = -ENODEV;
 891                         goto out;
 892                 }
 893
 894 #ifdef CONFIG_CHELSIO_T4_DCB
 895                 if (cxgbit_get_iscsi_dcb_state(ndev))
 896                         priority = cxgbit_get_iscsi_dcb_priority(ndev,
 897                                                                  local_port);
 898
 899                 csk->dcb_priority = priority;
 900
 901                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t, n, ndev, priority);
 902 #else
 903                 csk->l2t = cxgb4_l2t_get(cdev->lldi.l2t, n, ndev, 0);
 904 #endif
 905                 if (!csk->l2t)
 906                         goto out;
 907                 port_id = cxgb4_port_idx(ndev);
 908                 csk->mtu = dst_mtu(dst);
 909                 csk->tx_chan = cxgb4_port_chan(ndev);
 910                 csk->smac_idx = (cxgb4_port_viid(ndev) & 0x7F) << 1;
 911                 step = cdev->lldi.ntxq /
 912                         cdev->lldi.nports;
 913                 csk->txq_idx = (port_id * step) +
 914                                 (cdev->selectq[port_id][0]++ % step);
 915                 csk->ctrlq_idx = cxgb4_port_idx(ndev);
 916                 step = cdev->lldi.nrxq /
 917                         cdev->lldi.nports;
 918                 rxq_idx = (port_id * step) +
 919                                 (cdev->selectq[port_id][1]++ % step);
 920                 csk->rss_qid = cdev->lldi.rxq_ids[rxq_idx];
 921                 csk->port_id = port_id;
 922                 cxgbit_set_tcp_window(csk,
 923                                       (struct port_info *)netdev_priv(ndev));
 924         }
 925         ret = 0;
 926 out:
 927         rcu_read_unlock();
 928         neigh_release(n);
 929         return ret;
 930 }
 931
 932 int cxgbit_ofld_send(struct cxgbit_device *cdev, struct sk_buff *skb)
 933 {
 934         int ret = 0;
 935
 936         if (!test_bit(CDEV_STATE_UP, &cdev->flags)) {
 937                 kfree_skb(skb);
 938                 pr_err("%s - device not up - dropping\n", __func__);
 939                 return -EIO;
 940         }
 941
 942         ret = cxgb4_ofld_send(cdev->lldi.ports[0], skb);
 943         if (ret < 0)
 944                 kfree_skb(skb);
 945         return ret < 0 ? ret : 0;
 946 }
 947
 948 static void cxgbit_release_tid(struct cxgbit_device *cdev, u32 tid)
 949 {
 950         u32 len = roundup(sizeof(struct cpl_tid_release), 16);
 951         struct sk_buff *skb;
 952
 953         skb = alloc_skb(len, GFP_ATOMIC);
 954         if (!skb)
 955                 return;
 956
 957         cxgb_mk_tid_release(skb, len, tid, 0);
 958         cxgbit_ofld_send(cdev, skb);
 959 }
 960
 961 int
 962 cxgbit_l2t_send(struct cxgbit_device *cdev, struct sk_buff *skb,
 963                 struct l2t_entry *l2e)
 964 {
 965         int ret = 0;
 966
 967         if (!test_bit(CDEV_STATE_UP, &cdev->flags)) {
 968                 kfree_skb(skb);
 969                 pr_err("%s - device not up - dropping\n", __func__);
 970                 return -EIO;
 971         }
 972
 973         ret = cxgb4_l2t_send(cdev->lldi.ports[0], skb, l2e);
 974         if (ret < 0)
 975                 kfree_skb(skb);
 976         return ret < 0 ? ret : 0;
 977 }
 978
 979 static void cxgbit_send_rx_credits(struct cxgbit_sock *csk, struct sk_buff *skb)
 980 {
 981         if (csk->com.state != CSK_STATE_ESTABLISHED) {
 982                 __kfree_skb(skb);
 983                 return;
 984         }
 985
 986         cxgbit_ofld_send(csk->com.cdev, skb);
 987 }
 988
 989 /*
 990  * CPL connection rx data ack: host ->
 991  * Send RX credits through an RX_DATA_ACK CPL message.
 992  * Returns the number of credits sent.
 993  */
 994 int cxgbit_rx_data_ack(struct cxgbit_sock *csk)
 995 {
 996         struct sk_buff *skb;
 997         struct cpl_rx_data_ack *req;
 998         unsigned int len = roundup(sizeof(*req), 16);
 999
1000         skb = alloc_skb(len, GFP_KERNEL);
1001         if (!skb)
1002                 return -1;
1003
1004         req = (struct cpl_rx_data_ack *)__skb_put(skb, len);
1005         memset(req, 0, len);
1006
1007         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->ctrlq_idx);
1008         INIT_TP_WR(req, csk->tid);
1009         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
1010                                                     csk->tid));
1011         req->credit_dack = cpu_to_be32(RX_DACK_CHANGE_F | RX_DACK_MODE_V(1) |
1012                                        RX_CREDITS_V(csk->rx_credits));
1013
1014         csk->rx_credits = 0;
1015
1016         spin_lock_bh(&csk->lock);
1017         if (csk->lock_owner) {
1018                 cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_send_rx_credits;
1019                 __skb_queue_tail(&csk->backlogq, skb);
1020                 spin_unlock_bh(&csk->lock);
1021                 return 0;
1022         }
1023
1024         cxgbit_send_rx_credits(csk, skb);
1025         spin_unlock_bh(&csk->lock);
1026
1027         return 0;
1028 }
1029
1030 #define FLOWC_WR_NPARAMS_MIN    9
1031 #define FLOWC_WR_NPARAMS_MAX    11
1032 static int cxgbit_alloc_csk_skb(struct cxgbit_sock *csk)
1033 {
1034         struct sk_buff *skb;
1035         u32 len, flowclen;
1036         u8 i;
1037
1038         flowclen = offsetof(struct fw_flowc_wr,
1039                             mnemval[FLOWC_WR_NPARAMS_MAX]);
1040
1041         len = max_t(u32, sizeof(struct cpl_abort_req),
1042                     sizeof(struct cpl_abort_rpl));
1043
1044         len = max(len, flowclen);
1045         len = roundup(len, 16);
1046
1047         for (i = 0; i < 3; i++) {
1048                 skb = alloc_skb(len, GFP_ATOMIC);
1049                 if (!skb)
1050                         goto out;
1051                 __skb_queue_tail(&csk->skbq, skb);
1052         }
1053
1054         skb = alloc_skb(LRO_SKB_MIN_HEADROOM, GFP_ATOMIC);
1055         if (!skb)
1056                 goto out;
1057
1058         memset(skb->data, 0, LRO_SKB_MIN_HEADROOM);
1059         csk->lro_hskb = skb;
1060
1061         return 0;
1062 out:
1063         __skb_queue_purge(&csk->skbq);
1064         return -ENOMEM;
1065 }
1066
1067 static void
1068 cxgbit_pass_accept_rpl(struct cxgbit_sock *csk, struct cpl_pass_accept_req *req)
1069 {
1070         struct sk_buff *skb;
1071         const struct tcphdr *tcph;
1072         struct cpl_t5_pass_accept_rpl *rpl5;
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 = (struct cpl_t5_pass_accept_rpl *)__skb_put(skb, len);
1089         memset(rpl5, 0, len);
1090
1091         INIT_TP_WR(rpl5, csk->tid);
1092         OPCODE_TID(rpl5) = cpu_to_be32(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL,
1093                                                      csk->tid));
1094         cxgb_best_mtu(csk->com.cdev->lldi.mtus, csk->mtu, &mtu_idx,
1095                       req->tcpopt.tstamp,
1096                       (csk->com.remote_addr.ss_family == AF_INET) ? 0 : 1);
1097         wscale = cxgb_compute_wscale(csk->rcv_win);
1098         /*
1099          * Specify the largest window that will fit in opt0. The
1100          * remainder will be specified in the rx_data_ack.
1101          */
1102         win = csk->rcv_win >> 10;
1103         if (win > RCV_BUFSIZ_M)
1104                 win = RCV_BUFSIZ_M;
1105         opt0 =  TCAM_BYPASS_F |
1106                 WND_SCALE_V(wscale) |
1107                 MSS_IDX_V(mtu_idx) |
1108                 L2T_IDX_V(csk->l2t->idx) |
1109                 TX_CHAN_V(csk->tx_chan) |
1110                 SMAC_SEL_V(csk->smac_idx) |
1111                 DSCP_V(csk->tos >> 2) |
1112                 ULP_MODE_V(ULP_MODE_ISCSI) |
1113                 RCV_BUFSIZ_V(win);
1114
1115         opt2 = RX_CHANNEL_V(0) |
1116                 RSS_QUEUE_VALID_F | RSS_QUEUE_V(csk->rss_qid);
1117
1118         if (req->tcpopt.tstamp)
1119                 opt2 |= TSTAMPS_EN_F;
1120         if (req->tcpopt.sack)
1121                 opt2 |= SACK_EN_F;
1122         if (wscale)
1123                 opt2 |= WND_SCALE_EN_F;
1124
1125         hlen = ntohl(req->hdr_len);
1126         tcph = (const void *)(req + 1) + ETH_HDR_LEN_G(hlen) +
1127                 IP_HDR_LEN_G(hlen);
1128
1129         if (tcph->ece && tcph->cwr)
1130                 opt2 |= CCTRL_ECN_V(1);
1131
1132         opt2 |= RX_COALESCE_V(3);
1133         opt2 |= CONG_CNTRL_V(CONG_ALG_NEWRENO);
1134
1135         opt2 |= T5_ISS_F;
1136         rpl5->iss = cpu_to_be32((prandom_u32() & ~7UL) - 1);
1137
1138         opt2 |= T5_OPT_2_VALID_F;
1139
1140         rpl5->opt0 = cpu_to_be64(opt0);
1141         rpl5->opt2 = cpu_to_be32(opt2);
1142         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->ctrlq_idx);
1143         t4_set_arp_err_handler(skb, NULL, cxgbit_arp_failure_discard);
1144         cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
1145 }
1146
1147 static void
1148 cxgbit_pass_accept_req(struct cxgbit_device *cdev, struct sk_buff *skb)
1149 {
1150         struct cxgbit_sock *csk = NULL;
1151         struct cxgbit_np *cnp;
1152         struct cpl_pass_accept_req *req = cplhdr(skb);
1153         unsigned int stid = PASS_OPEN_TID_G(ntohl(req->tos_stid));
1154         struct tid_info *t = cdev->lldi.tids;
1155         unsigned int tid = GET_TID(req);
1156         u16 peer_mss = ntohs(req->tcpopt.mss);
1157         unsigned short hdrs;
1158
1159         struct dst_entry *dst;
1160         __u8 local_ip[16], peer_ip[16];
1161         __be16 local_port, peer_port;
1162         int ret;
1163         int iptype;
1164
1165         pr_debug("%s: cdev = %p; stid = %u; tid = %u\n",
1166                  __func__, cdev, stid, tid);
1167
1168         cnp = lookup_stid(t, stid);
1169         if (!cnp) {
1170                 pr_err("%s connect request on invalid stid %d\n",
1171                        __func__, stid);
1172                 goto rel_skb;
1173         }
1174
1175         if (cnp->com.state != CSK_STATE_LISTEN) {
1176                 pr_err("%s - listening parent not in CSK_STATE_LISTEN\n",
1177                        __func__);
1178                 goto reject;
1179         }
1180
1181         csk = lookup_tid(t, tid);
1182         if (csk) {
1183                 pr_err("%s csk not null tid %u\n",
1184                        __func__, tid);
1185                 goto rel_skb;
1186         }
1187
1188         cxgb_get_4tuple(req, cdev->lldi.adapter_type, &iptype, local_ip,
1189                         peer_ip, &local_port, &peer_port);
1190
1191         /* Find output route */
1192         if (iptype == 4)  {
1193                 pr_debug("%s parent sock %p tid %u laddr %pI4 raddr %pI4 "
1194                          "lport %d rport %d peer_mss %d\n"
1195                          , __func__, cnp, tid,
1196                          local_ip, peer_ip, ntohs(local_port),
1197                          ntohs(peer_port), peer_mss);
1198                 dst = cxgb_find_route(&cdev->lldi, cxgbit_get_real_dev,
1199                                       *(__be32 *)local_ip,
1200                                       *(__be32 *)peer_ip,
1201                                       local_port, peer_port,
1202                                       PASS_OPEN_TOS_G(ntohl(req->tos_stid)));
1203         } else {
1204                 pr_debug("%s parent sock %p tid %u laddr %pI6 raddr %pI6 "
1205                          "lport %d rport %d peer_mss %d\n"
1206                          , __func__, cnp, tid,
1207                          local_ip, peer_ip, ntohs(local_port),
1208                          ntohs(peer_port), peer_mss);
1209                 dst = cxgb_find_route6(&cdev->lldi, cxgbit_get_real_dev,
1210                                        local_ip, peer_ip,
1211                                        local_port, peer_port,
1212                                        PASS_OPEN_TOS_G(ntohl(req->tos_stid)),
1213                                        ((struct sockaddr_in6 *)
1214                                         &cnp->com.local_addr)->sin6_scope_id);
1215         }
1216         if (!dst) {
1217                 pr_err("%s - failed to find dst entry!\n",
1218                        __func__);
1219                 goto reject;
1220         }
1221
1222         csk = kzalloc(sizeof(*csk), GFP_ATOMIC);
1223         if (!csk) {
1224                 dst_release(dst);
1225                 goto rel_skb;
1226         }
1227
1228         ret = cxgbit_offload_init(csk, iptype, peer_ip, ntohs(local_port),
1229                                   dst, cdev);
1230         if (ret) {
1231                 pr_err("%s - failed to allocate l2t entry!\n",
1232                        __func__);
1233                 dst_release(dst);
1234                 kfree(csk);
1235                 goto reject;
1236         }
1237
1238         kref_init(&csk->kref);
1239         init_completion(&csk->com.wr_wait.completion);
1240
1241         INIT_LIST_HEAD(&csk->accept_node);
1242
1243         hdrs = (iptype == 4 ? sizeof(struct iphdr) : sizeof(struct ipv6hdr)) +
1244                 sizeof(struct tcphdr) + (req->tcpopt.tstamp ? 12 : 0);
1245         if (peer_mss && csk->mtu > (peer_mss + hdrs))
1246                 csk->mtu = peer_mss + hdrs;
1247
1248         csk->com.state = CSK_STATE_CONNECTING;
1249         csk->com.cdev = cdev;
1250         csk->cnp = cnp;
1251         csk->tos = PASS_OPEN_TOS_G(ntohl(req->tos_stid));
1252         csk->dst = dst;
1253         csk->tid = tid;
1254         csk->wr_cred = cdev->lldi.wr_cred -
1255                         DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1256         csk->wr_max_cred = csk->wr_cred;
1257         csk->wr_una_cred = 0;
1258
1259         if (iptype == 4) {
1260                 struct sockaddr_in *sin = (struct sockaddr_in *)
1261                                           &csk->com.local_addr;
1262                 sin->sin_family = AF_INET;
1263                 sin->sin_port = local_port;
1264                 sin->sin_addr.s_addr = *(__be32 *)local_ip;
1265
1266                 sin = (struct sockaddr_in *)&csk->com.remote_addr;
1267                 sin->sin_family = AF_INET;
1268                 sin->sin_port = peer_port;
1269                 sin->sin_addr.s_addr = *(__be32 *)peer_ip;
1270         } else {
1271                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
1272                                             &csk->com.local_addr;
1273
1274                 sin6->sin6_family = PF_INET6;
1275                 sin6->sin6_port = local_port;
1276                 memcpy(sin6->sin6_addr.s6_addr, local_ip, 16);
1277                 cxgb4_clip_get(cdev->lldi.ports[0],
1278                                (const u32 *)&sin6->sin6_addr.s6_addr,
1279                                1);
1280
1281                 sin6 = (struct sockaddr_in6 *)&csk->com.remote_addr;
1282                 sin6->sin6_family = PF_INET6;
1283                 sin6->sin6_port = peer_port;
1284                 memcpy(sin6->sin6_addr.s6_addr, peer_ip, 16);
1285         }
1286
1287         skb_queue_head_init(&csk->rxq);
1288         skb_queue_head_init(&csk->txq);
1289         skb_queue_head_init(&csk->ppodq);
1290         skb_queue_head_init(&csk->backlogq);
1291         skb_queue_head_init(&csk->skbq);
1292         cxgbit_sock_reset_wr_list(csk);
1293         spin_lock_init(&csk->lock);
1294         init_waitqueue_head(&csk->waitq);
1295         init_waitqueue_head(&csk->ack_waitq);
1296         csk->lock_owner = false;
1297
1298         if (cxgbit_alloc_csk_skb(csk)) {
1299                 dst_release(dst);
1300                 kfree(csk);
1301                 goto rel_skb;
1302         }
1303
1304         cxgbit_get_cdev(cdev);
1305
1306         spin_lock(&cdev->cskq.lock);
1307         list_add_tail(&csk->list, &cdev->cskq.list);
1308         spin_unlock(&cdev->cskq.lock);
1309
1310         cxgb4_insert_tid(t, csk, tid);
1311         cxgbit_pass_accept_rpl(csk, req);
1312         goto rel_skb;
1313
1314 reject:
1315         cxgbit_release_tid(cdev, tid);
1316 rel_skb:
1317         __kfree_skb(skb);
1318 }
1319
1320 static u32
1321 cxgbit_tx_flowc_wr_credits(struct cxgbit_sock *csk, u32 *nparamsp,
1322                            u32 *flowclenp)
1323 {
1324         u32 nparams, flowclen16, flowclen;
1325
1326         nparams = FLOWC_WR_NPARAMS_MIN;
1327
1328         if (csk->snd_wscale)
1329                 nparams++;
1330
1331 #ifdef CONFIG_CHELSIO_T4_DCB
1332         nparams++;
1333 #endif
1334         flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
1335         flowclen16 = DIV_ROUND_UP(flowclen, 16);
1336         flowclen = flowclen16 * 16;
1337         /*
1338          * Return the number of 16-byte credits used by the flowc request.
1339          * Pass back the nparams and actual flowc length if requested.
1340          */
1341         if (nparamsp)
1342                 *nparamsp = nparams;
1343         if (flowclenp)
1344                 *flowclenp = flowclen;
1345         return flowclen16;
1346 }
1347
1348 u32 cxgbit_send_tx_flowc_wr(struct cxgbit_sock *csk)
1349 {
1350         struct cxgbit_device *cdev = csk->com.cdev;
1351         struct fw_flowc_wr *flowc;
1352         u32 nparams, flowclen16, flowclen;
1353         struct sk_buff *skb;
1354         u8 index;
1355
1356 #ifdef CONFIG_CHELSIO_T4_DCB
1357         u16 vlan = ((struct l2t_entry *)csk->l2t)->vlan;
1358 #endif
1359
1360         flowclen16 = cxgbit_tx_flowc_wr_credits(csk, &nparams, &flowclen);
1361
1362         skb = __skb_dequeue(&csk->skbq);
1363         flowc = (struct fw_flowc_wr *)__skb_put(skb, flowclen);
1364         memset(flowc, 0, flowclen);
1365
1366         flowc->op_to_nparams = cpu_to_be32(FW_WR_OP_V(FW_FLOWC_WR) |
1367                                            FW_FLOWC_WR_NPARAMS_V(nparams));
1368         flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(flowclen16) |
1369                                           FW_WR_FLOWID_V(csk->tid));
1370         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
1371         flowc->mnemval[0].val = cpu_to_be32(FW_PFVF_CMD_PFN_V
1372                                             (csk->com.cdev->lldi.pf));
1373         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
1374         flowc->mnemval[1].val = cpu_to_be32(csk->tx_chan);
1375         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
1376         flowc->mnemval[2].val = cpu_to_be32(csk->tx_chan);
1377         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
1378         flowc->mnemval[3].val = cpu_to_be32(csk->rss_qid);
1379         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
1380         flowc->mnemval[4].val = cpu_to_be32(csk->snd_nxt);
1381         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
1382         flowc->mnemval[5].val = cpu_to_be32(csk->rcv_nxt);
1383         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
1384         flowc->mnemval[6].val = cpu_to_be32(csk->snd_win);
1385         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
1386         flowc->mnemval[7].val = cpu_to_be32(csk->emss);
1387
1388         flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
1389         if (test_bit(CDEV_ISO_ENABLE, &cdev->flags))
1390                 flowc->mnemval[8].val = cpu_to_be32(CXGBIT_MAX_ISO_PAYLOAD);
1391         else
1392                 flowc->mnemval[8].val = cpu_to_be32(16384);
1393
1394         index = 9;
1395
1396         if (csk->snd_wscale) {
1397                 flowc->mnemval[index].mnemonic = FW_FLOWC_MNEM_RCV_SCALE;
1398                 flowc->mnemval[index].val = cpu_to_be32(csk->snd_wscale);
1399                 index++;
1400         }
1401
1402 #ifdef CONFIG_CHELSIO_T4_DCB
1403         flowc->mnemval[index].mnemonic = FW_FLOWC_MNEM_DCBPRIO;
1404         if (vlan == VLAN_NONE) {
1405                 pr_warn("csk %u without VLAN Tag on DCB Link\n", csk->tid);
1406                 flowc->mnemval[index].val = cpu_to_be32(0);
1407         } else
1408                 flowc->mnemval[index].val = cpu_to_be32(
1409                                 (vlan & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT);
1410 #endif
1411
1412         pr_debug("%s: csk %p; tx_chan = %u; rss_qid = %u; snd_seq = %u;"
1413                  " rcv_seq = %u; snd_win = %u; emss = %u\n",
1414                  __func__, csk, csk->tx_chan, csk->rss_qid, csk->snd_nxt,
1415                  csk->rcv_nxt, csk->snd_win, csk->emss);
1416         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx);
1417         cxgbit_ofld_send(csk->com.cdev, skb);
1418         return flowclen16;
1419 }
1420
1421 int cxgbit_setup_conn_digest(struct cxgbit_sock *csk)
1422 {
1423         struct sk_buff *skb;
1424         struct cpl_set_tcb_field *req;
1425         u8 hcrc = csk->submode & CXGBIT_SUBMODE_HCRC;
1426         u8 dcrc = csk->submode & CXGBIT_SUBMODE_DCRC;
1427         unsigned int len = roundup(sizeof(*req), 16);
1428         int ret;
1429
1430         skb = alloc_skb(len, GFP_KERNEL);
1431         if (!skb)
1432                 return -ENOMEM;
1433
1434         /*  set up ulp submode */
1435         req = (struct cpl_set_tcb_field *)__skb_put(skb, len);
1436         memset(req, 0, len);
1437
1438         INIT_TP_WR(req, csk->tid);
1439         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1440         req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
1441         req->word_cookie = htons(0);
1442         req->mask = cpu_to_be64(0x3 << 4);
1443         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1444                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1445         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->ctrlq_idx);
1446
1447         cxgbit_get_csk(csk);
1448         cxgbit_init_wr_wait(&csk->com.wr_wait);
1449
1450         cxgbit_ofld_send(csk->com.cdev, skb);
1451
1452         ret = cxgbit_wait_for_reply(csk->com.cdev,
1453                                     &csk->com.wr_wait,
1454                                     csk->tid, 5, __func__);
1455         if (ret)
1456                 return -1;
1457
1458         return 0;
1459 }
1460
1461 int cxgbit_setup_conn_pgidx(struct cxgbit_sock *csk, u32 pg_idx)
1462 {
1463         struct sk_buff *skb;
1464         struct cpl_set_tcb_field *req;
1465         unsigned int len = roundup(sizeof(*req), 16);
1466         int ret;
1467
1468         skb = alloc_skb(len, GFP_KERNEL);
1469         if (!skb)
1470                 return -ENOMEM;
1471
1472         req = (struct cpl_set_tcb_field *)__skb_put(skb, len);
1473         memset(req, 0, len);
1474
1475         INIT_TP_WR(req, csk->tid);
1476         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1477         req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
1478         req->word_cookie = htons(0);
1479         req->mask = cpu_to_be64(0x3 << 8);
1480         req->val = cpu_to_be64(pg_idx << 8);
1481         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->ctrlq_idx);
1482
1483         cxgbit_get_csk(csk);
1484         cxgbit_init_wr_wait(&csk->com.wr_wait);
1485
1486         cxgbit_ofld_send(csk->com.cdev, skb);
1487
1488         ret = cxgbit_wait_for_reply(csk->com.cdev,
1489                                     &csk->com.wr_wait,
1490                                     csk->tid, 5, __func__);
1491         if (ret)
1492                 return -1;
1493
1494         return 0;
1495 }
1496
1497 static void
1498 cxgbit_pass_open_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1499 {
1500         struct cpl_pass_open_rpl *rpl = cplhdr(skb);
1501         struct tid_info *t = cdev->lldi.tids;
1502         unsigned int stid = GET_TID(rpl);
1503         struct cxgbit_np *cnp = lookup_stid(t, stid);
1504
1505         pr_debug("%s: cnp = %p; stid = %u; status = %d\n",
1506                  __func__, cnp, stid, rpl->status);
1507
1508         if (!cnp) {
1509                 pr_info("%s stid %d lookup failure\n", __func__, stid);
1510                 return;
1511         }
1512
1513         cxgbit_wake_up(&cnp->com.wr_wait, __func__, rpl->status);
1514         cxgbit_put_cnp(cnp);
1515 }
1516
1517 static void
1518 cxgbit_close_listsrv_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1519 {
1520         struct cpl_close_listsvr_rpl *rpl = cplhdr(skb);
1521         struct tid_info *t = cdev->lldi.tids;
1522         unsigned int stid = GET_TID(rpl);
1523         struct cxgbit_np *cnp = lookup_stid(t, stid);
1524
1525         pr_debug("%s: cnp = %p; stid = %u; status = %d\n",
1526                  __func__, cnp, stid, rpl->status);
1527
1528         if (!cnp) {
1529                 pr_info("%s stid %d lookup failure\n", __func__, stid);
1530                 return;
1531         }
1532
1533         cxgbit_wake_up(&cnp->com.wr_wait, __func__, rpl->status);
1534         cxgbit_put_cnp(cnp);
1535 }
1536
1537 static void
1538 cxgbit_pass_establish(struct cxgbit_device *cdev, struct sk_buff *skb)
1539 {
1540         struct cpl_pass_establish *req = cplhdr(skb);
1541         struct tid_info *t = cdev->lldi.tids;
1542         unsigned int tid = GET_TID(req);
1543         struct cxgbit_sock *csk;
1544         struct cxgbit_np *cnp;
1545         u16 tcp_opt = be16_to_cpu(req->tcp_opt);
1546         u32 snd_isn = be32_to_cpu(req->snd_isn);
1547         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
1548
1549         csk = lookup_tid(t, tid);
1550         if (unlikely(!csk)) {
1551                 pr_err("can't find connection for tid %u.\n", tid);
1552                 goto rel_skb;
1553         }
1554         cnp = csk->cnp;
1555
1556         pr_debug("%s: csk %p; tid %u; cnp %p\n",
1557                  __func__, csk, tid, cnp);
1558
1559         csk->write_seq = snd_isn;
1560         csk->snd_una = snd_isn;
1561         csk->snd_nxt = snd_isn;
1562
1563         csk->rcv_nxt = rcv_isn;
1564
1565         if (csk->rcv_win > (RCV_BUFSIZ_M << 10))
1566                 csk->rx_credits = (csk->rcv_win - (RCV_BUFSIZ_M << 10));
1567
1568         csk->snd_wscale = TCPOPT_SND_WSCALE_G(tcp_opt);
1569         cxgbit_set_emss(csk, tcp_opt);
1570         dst_confirm(csk->dst);
1571         csk->com.state = CSK_STATE_ESTABLISHED;
1572         spin_lock_bh(&cnp->np_accept_lock);
1573         list_add_tail(&csk->accept_node, &cnp->np_accept_list);
1574         spin_unlock_bh(&cnp->np_accept_lock);
1575         complete(&cnp->accept_comp);
1576 rel_skb:
1577         __kfree_skb(skb);
1578 }
1579
1580 static void cxgbit_queue_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1581 {
1582         cxgbit_skcb_flags(skb) = 0;
1583         spin_lock_bh(&csk->rxq.lock);
1584         __skb_queue_tail(&csk->rxq, skb);
1585         spin_unlock_bh(&csk->rxq.lock);
1586         wake_up(&csk->waitq);
1587 }
1588
1589 static void cxgbit_peer_close(struct cxgbit_sock *csk, struct sk_buff *skb)
1590 {
1591         pr_debug("%s: csk %p; tid %u; state %d\n",
1592                  __func__, csk, csk->tid, csk->com.state);
1593
1594         switch (csk->com.state) {
1595         case CSK_STATE_ESTABLISHED:
1596                 csk->com.state = CSK_STATE_CLOSING;
1597                 cxgbit_queue_rx_skb(csk, skb);
1598                 return;
1599         case CSK_STATE_CLOSING:
1600                 /* simultaneous close */
1601                 csk->com.state = CSK_STATE_MORIBUND;
1602                 break;
1603         case CSK_STATE_MORIBUND:
1604                 csk->com.state = CSK_STATE_DEAD;
1605                 cxgbit_put_csk(csk);
1606                 break;
1607         case CSK_STATE_ABORTING:
1608                 break;
1609         default:
1610                 pr_info("%s: cpl_peer_close in bad state %d\n",
1611                         __func__, csk->com.state);
1612         }
1613
1614         __kfree_skb(skb);
1615 }
1616
1617 static void cxgbit_close_con_rpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1618 {
1619         pr_debug("%s: csk %p; tid %u; state %d\n",
1620                  __func__, csk, csk->tid, csk->com.state);
1621
1622         switch (csk->com.state) {
1623         case CSK_STATE_CLOSING:
1624                 csk->com.state = CSK_STATE_MORIBUND;
1625                 break;
1626         case CSK_STATE_MORIBUND:
1627                 csk->com.state = CSK_STATE_DEAD;
1628                 cxgbit_put_csk(csk);
1629                 break;
1630         case CSK_STATE_ABORTING:
1631         case CSK_STATE_DEAD:
1632                 break;
1633         default:
1634                 pr_info("%s: cpl_close_con_rpl in bad state %d\n",
1635                         __func__, csk->com.state);
1636         }
1637
1638         __kfree_skb(skb);
1639 }
1640
1641 static void cxgbit_abort_req_rss(struct cxgbit_sock *csk, struct sk_buff *skb)
1642 {
1643         struct cpl_abort_req_rss *hdr = cplhdr(skb);
1644         unsigned int tid = GET_TID(hdr);
1645         struct sk_buff *rpl_skb;
1646         bool release = false;
1647         bool wakeup_thread = false;
1648         u32 len = roundup(sizeof(struct cpl_abort_rpl), 16);
1649
1650         pr_debug("%s: csk %p; tid %u; state %d\n",
1651                  __func__, csk, tid, csk->com.state);
1652
1653         if (cxgb_is_neg_adv(hdr->status)) {
1654                 pr_err("%s: got neg advise %d on tid %u\n",
1655                        __func__, hdr->status, tid);
1656                 goto rel_skb;
1657         }
1658
1659         switch (csk->com.state) {
1660         case CSK_STATE_CONNECTING:
1661         case CSK_STATE_MORIBUND:
1662                 csk->com.state = CSK_STATE_DEAD;
1663                 release = true;
1664                 break;
1665         case CSK_STATE_ESTABLISHED:
1666                 csk->com.state = CSK_STATE_DEAD;
1667                 wakeup_thread = true;
1668                 break;
1669         case CSK_STATE_CLOSING:
1670                 csk->com.state = CSK_STATE_DEAD;
1671                 if (!csk->conn)
1672                         release = true;
1673                 break;
1674         case CSK_STATE_ABORTING:
1675                 break;
1676         default:
1677                 pr_info("%s: cpl_abort_req_rss in bad state %d\n",
1678                         __func__, csk->com.state);
1679                 csk->com.state = CSK_STATE_DEAD;
1680         }
1681
1682         __skb_queue_purge(&csk->txq);
1683
1684         if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags))
1685                 cxgbit_send_tx_flowc_wr(csk);
1686
1687         rpl_skb = __skb_dequeue(&csk->skbq);
1688
1689         cxgb_mk_abort_rpl(rpl_skb, len, csk->tid, csk->txq_idx);
1690         cxgbit_ofld_send(csk->com.cdev, rpl_skb);
1691
1692         if (wakeup_thread) {
1693                 cxgbit_queue_rx_skb(csk, skb);
1694                 return;
1695         }
1696
1697         if (release)
1698                 cxgbit_put_csk(csk);
1699 rel_skb:
1700         __kfree_skb(skb);
1701 }
1702
1703 static void cxgbit_abort_rpl_rss(struct cxgbit_sock *csk, struct sk_buff *skb)
1704 {
1705         pr_debug("%s: csk %p; tid %u; state %d\n",
1706                  __func__, csk, csk->tid, csk->com.state);
1707
1708         switch (csk->com.state) {
1709         case CSK_STATE_ABORTING:
1710                 csk->com.state = CSK_STATE_DEAD;
1711                 cxgbit_put_csk(csk);
1712                 break;
1713         default:
1714                 pr_info("%s: cpl_abort_rpl_rss in state %d\n",
1715                         __func__, csk->com.state);
1716         }
1717
1718         __kfree_skb(skb);
1719 }
1720
1721 static bool cxgbit_credit_err(const struct cxgbit_sock *csk)
1722 {
1723         const struct sk_buff *skb = csk->wr_pending_head;
1724         u32 credit = 0;
1725
1726         if (unlikely(csk->wr_cred > csk->wr_max_cred)) {
1727                 pr_err("csk 0x%p, tid %u, credit %u > %u\n",
1728                        csk, csk->tid, csk->wr_cred, csk->wr_max_cred);
1729                 return true;
1730         }
1731
1732         while (skb) {
1733                 credit += skb->csum;
1734                 skb = cxgbit_skcb_tx_wr_next(skb);
1735         }
1736
1737         if (unlikely((csk->wr_cred + credit) != csk->wr_max_cred)) {
1738                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1739                        csk, csk->tid, csk->wr_cred,
1740                        credit, csk->wr_max_cred);
1741
1742                 return true;
1743         }
1744
1745         return false;
1746 }
1747
1748 static void cxgbit_fw4_ack(struct cxgbit_sock *csk, struct sk_buff *skb)
1749 {
1750         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)cplhdr(skb);
1751         u32 credits = rpl->credits;
1752         u32 snd_una = ntohl(rpl->snd_una);
1753
1754         csk->wr_cred += credits;
1755         if (csk->wr_una_cred > (csk->wr_max_cred - csk->wr_cred))
1756                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1757
1758         while (credits) {
1759                 struct sk_buff *p = cxgbit_sock_peek_wr(csk);
1760
1761                 if (unlikely(!p)) {
1762                         pr_err("csk 0x%p,%u, cr %u,%u+%u, empty.\n",
1763                                csk, csk->tid, credits,
1764                                csk->wr_cred, csk->wr_una_cred);
1765                         break;
1766                 }
1767
1768                 if (unlikely(credits < p->csum)) {
1769                         pr_warn("csk 0x%p,%u, cr %u,%u+%u, < %u.\n",
1770                                 csk,  csk->tid,
1771                                 credits, csk->wr_cred, csk->wr_una_cred,
1772                                 p->csum);
1773                         p->csum -= credits;
1774                         break;
1775                 }
1776
1777                 cxgbit_sock_dequeue_wr(csk);
1778                 credits -= p->csum;
1779                 kfree_skb(p);
1780         }
1781
1782         if (unlikely(cxgbit_credit_err(csk))) {
1783                 cxgbit_queue_rx_skb(csk, skb);
1784                 return;
1785         }
1786
1787         if (rpl->seq_vld & CPL_FW4_ACK_FLAGS_SEQVAL) {
1788                 if (unlikely(before(snd_una, csk->snd_una))) {
1789                         pr_warn("csk 0x%p,%u, snd_una %u/%u.",
1790                                 csk, csk->tid, snd_una,
1791                                 csk->snd_una);
1792                         goto rel_skb;
1793                 }
1794
1795                 if (csk->snd_una != snd_una) {
1796                         csk->snd_una = snd_una;
1797                         dst_confirm(csk->dst);
1798                         wake_up(&csk->ack_waitq);
1799                 }
1800         }
1801
1802         if (skb_queue_len(&csk->txq))
1803                 cxgbit_push_tx_frames(csk);
1804
1805 rel_skb:
1806         __kfree_skb(skb);
1807 }
1808
1809 static void cxgbit_set_tcb_rpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1810 {
1811         struct cxgbit_sock *csk;
1812         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1813         unsigned int tid = GET_TID(rpl);
1814         struct cxgb4_lld_info *lldi = &cdev->lldi;
1815         struct tid_info *t = lldi->tids;
1816
1817         csk = lookup_tid(t, tid);
1818         if (unlikely(!csk))
1819                 pr_err("can't find connection for tid %u.\n", tid);
1820         else
1821                 cxgbit_wake_up(&csk->com.wr_wait, __func__, rpl->status);
1822
1823         cxgbit_put_csk(csk);
1824 }
1825
1826 static void cxgbit_rx_data(struct cxgbit_device *cdev, struct sk_buff *skb)
1827 {
1828         struct cxgbit_sock *csk;
1829         struct cpl_rx_data *cpl = cplhdr(skb);
1830         unsigned int tid = GET_TID(cpl);
1831         struct cxgb4_lld_info *lldi = &cdev->lldi;
1832         struct tid_info *t = lldi->tids;
1833
1834         csk = lookup_tid(t, tid);
1835         if (unlikely(!csk)) {
1836                 pr_err("can't find conn. for tid %u.\n", tid);
1837                 goto rel_skb;
1838         }
1839
1840         cxgbit_queue_rx_skb(csk, skb);
1841         return;
1842 rel_skb:
1843         __kfree_skb(skb);
1844 }
1845
1846 static void
1847 __cxgbit_process_rx_cpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1848 {
1849         spin_lock(&csk->lock);
1850         if (csk->lock_owner) {
1851                 __skb_queue_tail(&csk->backlogq, skb);
1852                 spin_unlock(&csk->lock);
1853                 return;
1854         }
1855
1856         cxgbit_skcb_rx_backlog_fn(skb)(csk, skb);
1857         spin_unlock(&csk->lock);
1858 }
1859
1860 static void cxgbit_process_rx_cpl(struct cxgbit_sock *csk, struct sk_buff *skb)
1861 {
1862         cxgbit_get_csk(csk);
1863         __cxgbit_process_rx_cpl(csk, skb);
1864         cxgbit_put_csk(csk);
1865 }
1866
1867 static void cxgbit_rx_cpl(struct cxgbit_device *cdev, struct sk_buff *skb)
1868 {
1869         struct cxgbit_sock *csk;
1870         struct cpl_tx_data *cpl = cplhdr(skb);
1871         struct cxgb4_lld_info *lldi = &cdev->lldi;
1872         struct tid_info *t = lldi->tids;
1873         unsigned int tid = GET_TID(cpl);
1874         u8 opcode = cxgbit_skcb_rx_opcode(skb);
1875         bool ref = true;
1876
1877         switch (opcode) {
1878         case CPL_FW4_ACK:
1879                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_fw4_ack;
1880                         ref = false;
1881                         break;
1882         case CPL_PEER_CLOSE:
1883                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_peer_close;
1884                         break;
1885         case CPL_CLOSE_CON_RPL:
1886                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_close_con_rpl;
1887                         break;
1888         case CPL_ABORT_REQ_RSS:
1889                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_abort_req_rss;
1890                         break;
1891         case CPL_ABORT_RPL_RSS:
1892                         cxgbit_skcb_rx_backlog_fn(skb) = cxgbit_abort_rpl_rss;
1893                         break;
1894         default:
1895                 goto rel_skb;
1896         }
1897
1898         csk = lookup_tid(t, tid);
1899         if (unlikely(!csk)) {
1900                 pr_err("can't find conn. for tid %u.\n", tid);
1901                 goto rel_skb;
1902         }
1903
1904         if (ref)
1905                 cxgbit_process_rx_cpl(csk, skb);
1906         else
1907                 __cxgbit_process_rx_cpl(csk, skb);
1908
1909         return;
1910 rel_skb:
1911         __kfree_skb(skb);
1912 }
1913
1914 cxgbit_cplhandler_func cxgbit_cplhandlers[NUM_CPL_CMDS] = {
1915         [CPL_PASS_OPEN_RPL]     = cxgbit_pass_open_rpl,
1916         [CPL_CLOSE_LISTSRV_RPL] = cxgbit_close_listsrv_rpl,
1917         [CPL_PASS_ACCEPT_REQ]   = cxgbit_pass_accept_req,
1918         [CPL_PASS_ESTABLISH]    = cxgbit_pass_establish,
1919         [CPL_SET_TCB_RPL]       = cxgbit_set_tcb_rpl,
1920         [CPL_RX_DATA]           = cxgbit_rx_data,
1921         [CPL_FW4_ACK]           = cxgbit_rx_cpl,
1922         [CPL_PEER_CLOSE]        = cxgbit_rx_cpl,
1923         [CPL_CLOSE_CON_RPL]     = cxgbit_rx_cpl,
1924         [CPL_ABORT_REQ_RSS]     = cxgbit_rx_cpl,
1925         [CPL_ABORT_RPL_RSS]     = cxgbit_rx_cpl,
1926 };