drivers/target/iscsi/cxgbit/cxgbit_main.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 #define DRV_NAME "cxgbit"
  10 #define DRV_VERSION "1.0.0-ko"
  11 #define pr_fmt(fmt) DRV_NAME ": " fmt
  12
  13 #include "cxgbit.h"
  14
  15 #ifdef CONFIG_CHELSIO_T4_DCB
  16 #include <net/dcbevent.h>
  17 #include "cxgb4_dcb.h"
  18 #endif
  19
  20 LIST_HEAD(cdev_list_head);
  21 /* cdev list lock */
  22 DEFINE_MUTEX(cdev_list_lock);
  23
  24 void _cxgbit_free_cdev(struct kref *kref)
  25 {
  26         struct cxgbit_device *cdev;
  27
  28         cdev = container_of(kref, struct cxgbit_device, kref);
  29
  30         cxgbi_ppm_release(cdev2ppm(cdev));
  31         kfree(cdev);
  32 }
  33
  34 static void cxgbit_set_mdsl(struct cxgbit_device *cdev)
  35 {
  36         struct cxgb4_lld_info *lldi = &cdev->lldi;
  37         u32 mdsl;
  38
  39 #define ULP2_MAX_PKT_LEN 16224
  40 #define ISCSI_PDU_NONPAYLOAD_LEN 312
  41         mdsl = min_t(u32, lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN,
  42                      ULP2_MAX_PKT_LEN - ISCSI_PDU_NONPAYLOAD_LEN);
  43         mdsl = min_t(u32, mdsl, 8192);
  44         mdsl = min_t(u32, mdsl, (MAX_SKB_FRAGS - 1) * PAGE_SIZE);
  45
  46         cdev->mdsl = mdsl;
  47 }
  48
  49 static void *cxgbit_uld_add(const struct cxgb4_lld_info *lldi)
  50 {
  51         struct cxgbit_device *cdev;
  52
  53         if (is_t4(lldi->adapter_type))
  54                 return ERR_PTR(-ENODEV);
  55
  56         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
  57         if (!cdev)
  58                 return ERR_PTR(-ENOMEM);
  59
  60         kref_init(&cdev->kref);
  61
  62         cdev->lldi = *lldi;
  63
  64         cxgbit_set_mdsl(cdev);
  65
  66         if (cxgbit_ddp_init(cdev) < 0) {
  67                 kfree(cdev);
  68                 return ERR_PTR(-EINVAL);
  69         }
  70
  71         if (!test_bit(CDEV_DDP_ENABLE, &cdev->flags))
  72                 pr_info("cdev %s ddp init failed\n",
  73                         pci_name(lldi->pdev));
  74
  75         if (lldi->fw_vers >= 0x10d2b00)
  76                 set_bit(CDEV_ISO_ENABLE, &cdev->flags);
  77
  78         spin_lock_init(&cdev->cskq.lock);
  79         INIT_LIST_HEAD(&cdev->cskq.list);
  80
  81         mutex_lock(&cdev_list_lock);
  82         list_add_tail(&cdev->list, &cdev_list_head);
  83         mutex_unlock(&cdev_list_lock);
  84
  85         pr_info("cdev %s added for iSCSI target transport\n",
  86                 pci_name(lldi->pdev));
  87
  88         return cdev;
  89 }
  90
  91 static void cxgbit_close_conn(struct cxgbit_device *cdev)
  92 {
  93         struct cxgbit_sock *csk;
  94         struct sk_buff *skb;
  95         bool wakeup_thread = false;
  96
  97         spin_lock_bh(&cdev->cskq.lock);
  98         list_for_each_entry(csk, &cdev->cskq.list, list) {
  99                 skb = alloc_skb(0, GFP_ATOMIC);
 100                 if (!skb)
 101                         continue;
 102
 103                 spin_lock_bh(&csk->rxq.lock);
 104                 __skb_queue_tail(&csk->rxq, skb);
 105                 if (skb_queue_len(&csk->rxq) == 1)
 106                         wakeup_thread = true;
 107                 spin_unlock_bh(&csk->rxq.lock);
 108
 109                 if (wakeup_thread) {
 110                         wake_up(&csk->waitq);
 111                         wakeup_thread = false;
 112                 }
 113         }
 114         spin_unlock_bh(&cdev->cskq.lock);
 115 }
 116
 117 static void cxgbit_detach_cdev(struct cxgbit_device *cdev)
 118 {
 119         bool free_cdev = false;
 120
 121         spin_lock_bh(&cdev->cskq.lock);
 122         if (list_empty(&cdev->cskq.list))
 123                 free_cdev = true;
 124         spin_unlock_bh(&cdev->cskq.lock);
 125
 126         if (free_cdev) {
 127                 mutex_lock(&cdev_list_lock);
 128                 list_del(&cdev->list);
 129                 mutex_unlock(&cdev_list_lock);
 130
 131                 cxgbit_put_cdev(cdev);
 132         } else {
 133                 cxgbit_close_conn(cdev);
 134         }
 135 }
 136
 137 static int cxgbit_uld_state_change(void *handle, enum cxgb4_state state)
 138 {
 139         struct cxgbit_device *cdev = handle;
 140
 141         switch (state) {
 142         case CXGB4_STATE_UP:
 143                 set_bit(CDEV_STATE_UP, &cdev->flags);
 144                 pr_info("cdev %s state UP.\n", pci_name(cdev->lldi.pdev));
 145                 break;
 146         case CXGB4_STATE_START_RECOVERY:
 147                 clear_bit(CDEV_STATE_UP, &cdev->flags);
 148                 cxgbit_close_conn(cdev);
 149                 pr_info("cdev %s state RECOVERY.\n", pci_name(cdev->lldi.pdev));
 150                 break;
 151         case CXGB4_STATE_DOWN:
 152                 pr_info("cdev %s state DOWN.\n", pci_name(cdev->lldi.pdev));
 153                 break;
 154         case CXGB4_STATE_DETACH:
 155                 clear_bit(CDEV_STATE_UP, &cdev->flags);
 156                 pr_info("cdev %s state DETACH.\n", pci_name(cdev->lldi.pdev));
 157                 cxgbit_detach_cdev(cdev);
 158                 break;
 159         default:
 160                 pr_info("cdev %s unknown state %d.\n",
 161                         pci_name(cdev->lldi.pdev), state);
 162                 break;
 163         }
 164         return 0;
 165 }
 166
 167 static void
 168 cxgbit_proc_ddp_status(unsigned int tid, struct cpl_rx_data_ddp *cpl,
 169                        struct cxgbit_lro_pdu_cb *pdu_cb)
 170 {
 171         unsigned int status = ntohl(cpl->ddpvld);
 172
 173         pdu_cb->flags |= PDUCBF_RX_STATUS;
 174         pdu_cb->ddigest = ntohl(cpl->ulp_crc);
 175         pdu_cb->pdulen = ntohs(cpl->len);
 176
 177         if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) {
 178                 pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", tid, status);
 179                 pdu_cb->flags |= PDUCBF_RX_HCRC_ERR;
 180         }
 181
 182         if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) {
 183                 pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", tid, status);
 184                 pdu_cb->flags |= PDUCBF_RX_DCRC_ERR;
 185         }
 186
 187         if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT))
 188                 pr_info("tid 0x%x, status 0x%x, pad bad.\n", tid, status);
 189
 190         if ((status & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) &&
 191             (!(pdu_cb->flags & PDUCBF_RX_DATA))) {
 192                 pdu_cb->flags |= PDUCBF_RX_DATA_DDPD;
 193         }
 194 }
 195
 196 static void
 197 cxgbit_lro_add_packet_rsp(struct sk_buff *skb, u8 op, const __be64 *rsp)
 198 {
 199         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 200         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
 201                                                 lro_cb->pdu_idx);
 202         struct cpl_rx_iscsi_ddp *cpl = (struct cpl_rx_iscsi_ddp *)(rsp + 1);
 203
 204         cxgbit_proc_ddp_status(lro_cb->csk->tid, cpl, pdu_cb);
 205
 206         if (pdu_cb->flags & PDUCBF_RX_HDR)
 207                 pdu_cb->complete = true;
 208
 209         lro_cb->complete = true;
 210         lro_cb->pdu_totallen += pdu_cb->pdulen;
 211         lro_cb->pdu_idx++;
 212 }
 213
 214 static void
 215 cxgbit_copy_frags(struct sk_buff *skb, const struct pkt_gl *gl,
 216                   unsigned int offset)
 217 {
 218         u8 skb_frag_idx = skb_shinfo(skb)->nr_frags;
 219         u8 i;
 220
 221         /* usually there's just one frag */
 222         __skb_fill_page_desc(skb, skb_frag_idx, gl->frags[0].page,
 223                              gl->frags[0].offset + offset,
 224                              gl->frags[0].size - offset);
 225         for (i = 1; i < gl->nfrags; i++)
 226                 __skb_fill_page_desc(skb, skb_frag_idx + i,
 227                                      gl->frags[i].page,
 228                                      gl->frags[i].offset,
 229                                      gl->frags[i].size);
 230
 231         skb_shinfo(skb)->nr_frags += gl->nfrags;
 232
 233         /* get a reference to the last page, we don't own it */
 234         get_page(gl->frags[gl->nfrags - 1].page);
 235 }
 236
 237 static void
 238 cxgbit_lro_add_packet_gl(struct sk_buff *skb, u8 op, const struct pkt_gl *gl)
 239 {
 240         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 241         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
 242                                                 lro_cb->pdu_idx);
 243         u32 len, offset;
 244
 245         if (op == CPL_ISCSI_HDR) {
 246                 struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)gl->va;
 247
 248                 offset = sizeof(struct cpl_iscsi_hdr);
 249                 pdu_cb->flags |= PDUCBF_RX_HDR;
 250                 pdu_cb->seq = ntohl(cpl->seq);
 251                 len = ntohs(cpl->len);
 252                 pdu_cb->hdr = gl->va + offset;
 253                 pdu_cb->hlen = len;
 254                 pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;
 255
 256                 if (unlikely(gl->nfrags > 1))
 257                         cxgbit_skcb_flags(skb) = 0;
 258
 259                 lro_cb->complete = false;
 260         } else {
 261                 struct cpl_iscsi_data *cpl = (struct cpl_iscsi_data *)gl->va;
 262
 263                 offset = sizeof(struct cpl_iscsi_data);
 264                 pdu_cb->flags |= PDUCBF_RX_DATA;
 265                 len = ntohs(cpl->len);
 266                 pdu_cb->dlen = len;
 267                 pdu_cb->doffset = lro_cb->offset;
 268                 pdu_cb->nr_dfrags = gl->nfrags;
 269                 pdu_cb->dfrag_idx = skb_shinfo(skb)->nr_frags;
 270         }
 271
 272         cxgbit_copy_frags(skb, gl, offset);
 273
 274         pdu_cb->frags += gl->nfrags;
 275         lro_cb->offset += len;
 276         skb->len += len;
 277         skb->data_len += len;
 278         skb->truesize += len;
 279 }
 280
 281 static struct sk_buff *
 282 cxgbit_lro_init_skb(struct cxgbit_sock *csk, u8 op, const struct pkt_gl *gl,
 283                     const __be64 *rsp, struct napi_struct *napi)
 284 {
 285         struct sk_buff *skb;
 286         struct cxgbit_lro_cb *lro_cb;
 287
 288         skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM);
 289
 290         if (unlikely(!skb))
 291                 return NULL;
 292
 293         memset(skb->data, 0, LRO_SKB_MAX_HEADROOM);
 294
 295         cxgbit_skcb_flags(skb) |= SKCBF_RX_LRO;
 296
 297         lro_cb = cxgbit_skb_lro_cb(skb);
 298
 299         cxgbit_get_csk(csk);
 300
 301         lro_cb->csk = csk;
 302
 303         return skb;
 304 }
 305
 306 static void cxgbit_queue_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
 307 {
 308         bool wakeup_thread = false;
 309
 310         spin_lock(&csk->rxq.lock);
 311         __skb_queue_tail(&csk->rxq, skb);
 312         if (skb_queue_len(&csk->rxq) == 1)
 313                 wakeup_thread = true;
 314         spin_unlock(&csk->rxq.lock);
 315
 316         if (wakeup_thread)
 317                 wake_up(&csk->waitq);
 318 }
 319
 320 static void cxgbit_lro_flush(struct t4_lro_mgr *lro_mgr, struct sk_buff *skb)
 321 {
 322         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 323         struct cxgbit_sock *csk = lro_cb->csk;
 324
 325         csk->lro_skb = NULL;
 326
 327         __skb_unlink(skb, &lro_mgr->lroq);
 328         cxgbit_queue_lro_skb(csk, skb);
 329
 330         cxgbit_put_csk(csk);
 331
 332         lro_mgr->lro_pkts++;
 333         lro_mgr->lro_session_cnt--;
 334 }
 335
 336 static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr)
 337 {
 338         struct sk_buff *skb;
 339
 340         while ((skb = skb_peek(&lro_mgr->lroq)))
 341                 cxgbit_lro_flush(lro_mgr, skb);
 342 }
 343
 344 static int
 345 cxgbit_lro_receive(struct cxgbit_sock *csk, u8 op, const __be64 *rsp,
 346                    const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
 347                    struct napi_struct *napi)
 348 {
 349         struct sk_buff *skb;
 350         struct cxgbit_lro_cb *lro_cb;
 351
 352         if (!csk) {
 353                 pr_err("%s: csk NULL, op 0x%x.\n", __func__, op);
 354                 goto out;
 355         }
 356
 357         if (csk->lro_skb)
 358                 goto add_packet;
 359
 360 start_lro:
 361         if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) {
 362                 cxgbit_uld_lro_flush(lro_mgr);
 363                 goto start_lro;
 364         }
 365
 366         skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi);
 367         if (unlikely(!skb))
 368                 goto out;
 369
 370         csk->lro_skb = skb;
 371
 372         __skb_queue_tail(&lro_mgr->lroq, skb);
 373         lro_mgr->lro_session_cnt++;
 374
 375 add_packet:
 376         skb = csk->lro_skb;
 377         lro_cb = cxgbit_skb_lro_cb(skb);
 378
 379         if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) >
 380             MAX_SKB_FRAGS) || (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) ||
 381             (lro_cb->pdu_idx >= MAX_SKB_FRAGS)) {
 382                 cxgbit_lro_flush(lro_mgr, skb);
 383                 goto start_lro;
 384         }
 385
 386         if (gl)
 387                 cxgbit_lro_add_packet_gl(skb, op, gl);
 388         else
 389                 cxgbit_lro_add_packet_rsp(skb, op, rsp);
 390
 391         lro_mgr->lro_merged++;
 392
 393         return 0;
 394
 395 out:
 396         return -1;
 397 }
 398
 399 static int
 400 cxgbit_uld_lro_rx_handler(void *hndl, const __be64 *rsp,
 401                           const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
 402                           struct napi_struct *napi)
 403 {
 404         struct cxgbit_device *cdev = hndl;
 405         struct cxgb4_lld_info *lldi = &cdev->lldi;
 406         struct cpl_tx_data *rpl = NULL;
 407         struct cxgbit_sock *csk = NULL;
 408         unsigned int tid = 0;
 409         struct sk_buff *skb;
 410         unsigned int op = *(u8 *)rsp;
 411         bool lro_flush = true;
 412
 413         switch (op) {
 414         case CPL_ISCSI_HDR:
 415         case CPL_ISCSI_DATA:
 416         case CPL_RX_ISCSI_DDP:
 417         case CPL_FW4_ACK:
 418                 lro_flush = false;
 419         case CPL_ABORT_RPL_RSS:
 420         case CPL_PASS_ESTABLISH:
 421         case CPL_PEER_CLOSE:
 422         case CPL_CLOSE_CON_RPL:
 423         case CPL_ABORT_REQ_RSS:
 424         case CPL_SET_TCB_RPL:
 425         case CPL_RX_DATA:
 426                 rpl = gl ? (struct cpl_tx_data *)gl->va :
 427                            (struct cpl_tx_data *)(rsp + 1);
 428                 tid = GET_TID(rpl);
 429                 csk = lookup_tid(lldi->tids, tid);
 430                 break;
 431         default:
 432                 break;
 433         }
 434
 435         if (csk && csk->lro_skb && lro_flush)
 436                 cxgbit_lro_flush(lro_mgr, csk->lro_skb);
 437
 438         if (!gl) {
 439                 unsigned int len;
 440
 441                 if (op == CPL_RX_ISCSI_DDP) {
 442                         if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr,
 443                                                 napi))
 444                                 return 0;
 445                 }
 446
 447                 len = 64 - sizeof(struct rsp_ctrl) - 8;
 448                 skb = napi_alloc_skb(napi, len);
 449                 if (!skb)
 450                         goto nomem;
 451                 __skb_put(skb, len);
 452                 skb_copy_to_linear_data(skb, &rsp[1], len);
 453         } else {
 454                 if (unlikely(op != *(u8 *)gl->va)) {
 455                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
 456                                 gl->va, be64_to_cpu(*rsp),
 457                                 be64_to_cpu(*(u64 *)gl->va),
 458                                 gl->tot_len);
 459                         return 0;
 460                 }
 461
 462                 if (op == CPL_ISCSI_HDR || op == CPL_ISCSI_DATA) {
 463                         if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr,
 464                                                 napi))
 465                                 return 0;
 466                 }
 467
 468 #define RX_PULL_LEN 128
 469                 skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
 470                 if (unlikely(!skb))
 471                         goto nomem;
 472         }
 473
 474         rpl = (struct cpl_tx_data *)skb->data;
 475         op = rpl->ot.opcode;
 476         cxgbit_skcb_rx_opcode(skb) = op;
 477
 478         pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
 479                  cdev, op, rpl->ot.opcode_tid,
 480                  ntohl(rpl->ot.opcode_tid), skb);
 481
 482         if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) {
 483                 cxgbit_cplhandlers[op](cdev, skb);
 484         } else {
 485                 pr_err("No handler for opcode 0x%x.\n", op);
 486                 __kfree_skb(skb);
 487         }
 488         return 0;
 489 nomem:
 490         pr_err("%s OOM bailing out.\n", __func__);
 491         return 1;
 492 }
 493
 494 #ifdef CONFIG_CHELSIO_T4_DCB
 495 struct cxgbit_dcb_work {
 496         struct dcb_app_type dcb_app;
 497         struct work_struct work;
 498 };
 499
 500 static void
 501 cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id,
 502                            u8 dcb_priority, u16 port_num)
 503 {
 504         struct cxgbit_sock *csk;
 505         struct sk_buff *skb;
 506         u16 local_port;
 507         bool wakeup_thread = false;
 508
 509         spin_lock_bh(&cdev->cskq.lock);
 510         list_for_each_entry(csk, &cdev->cskq.list, list) {
 511                 if (csk->port_id != port_id)
 512                         continue;
 513
 514                 if (csk->com.local_addr.ss_family == AF_INET6) {
 515                         struct sockaddr_in6 *sock_in6;
 516
 517                         sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr;
 518                         local_port = ntohs(sock_in6->sin6_port);
 519                 } else {
 520                         struct sockaddr_in *sock_in;
 521
 522                         sock_in = (struct sockaddr_in *)&csk->com.local_addr;
 523                         local_port = ntohs(sock_in->sin_port);
 524                 }
 525
 526                 if (local_port != port_num)
 527                         continue;
 528
 529                 if (csk->dcb_priority == dcb_priority)
 530                         continue;
 531
 532                 skb = alloc_skb(0, GFP_ATOMIC);
 533                 if (!skb)
 534                         continue;
 535
 536                 spin_lock(&csk->rxq.lock);
 537                 __skb_queue_tail(&csk->rxq, skb);
 538                 if (skb_queue_len(&csk->rxq) == 1)
 539                         wakeup_thread = true;
 540                 spin_unlock(&csk->rxq.lock);
 541
 542                 if (wakeup_thread) {
 543                         wake_up(&csk->waitq);
 544                         wakeup_thread = false;
 545                 }
 546         }
 547         spin_unlock_bh(&cdev->cskq.lock);
 548 }
 549
 550 static void cxgbit_dcb_workfn(struct work_struct *work)
 551 {
 552         struct cxgbit_dcb_work *dcb_work;
 553         struct net_device *ndev;
 554         struct cxgbit_device *cdev = NULL;
 555         struct dcb_app_type *iscsi_app;
 556         u8 priority, port_id = 0xff;
 557
 558         dcb_work = container_of(work, struct cxgbit_dcb_work, work);
 559         iscsi_app = &dcb_work->dcb_app;
 560
 561         if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
 562                 if (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)
 563                         goto out;
 564
 565                 priority = iscsi_app->app.priority;
 566
 567         } else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
 568                 if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
 569                         goto out;
 570
 571                 if (!iscsi_app->app.priority)
 572                         goto out;
 573
 574                 priority = ffs(iscsi_app->app.priority) - 1;
 575         } else {
 576                 goto out;
 577         }
 578
 579         pr_debug("priority for ifid %d is %u\n",
 580                  iscsi_app->ifindex, priority);
 581
 582         ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);
 583
 584         if (!ndev)
 585                 goto out;
 586
 587         mutex_lock(&cdev_list_lock);
 588         cdev = cxgbit_find_device(ndev, &port_id);
 589
 590         dev_put(ndev);
 591
 592         if (!cdev) {
 593                 mutex_unlock(&cdev_list_lock);
 594                 goto out;
 595         }
 596
 597         cxgbit_update_dcb_priority(cdev, port_id, priority,
 598                                    iscsi_app->app.protocol);
 599         mutex_unlock(&cdev_list_lock);
 600 out:
 601         kfree(dcb_work);
 602 }
 603
 604 static int
 605 cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action,
 606                        void *data)
 607 {
 608         struct cxgbit_dcb_work *dcb_work;
 609         struct dcb_app_type *dcb_app = data;
 610
 611         dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC);
 612         if (!dcb_work)
 613                 return NOTIFY_DONE;
 614
 615         dcb_work->dcb_app = *dcb_app;
 616         INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn);
 617         schedule_work(&dcb_work->work);
 618         return NOTIFY_OK;
 619 }
 620 #endif
 621
 622 static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
 623 {
 624         return TARGET_PROT_NORMAL;
 625 }
 626
 627 static struct iscsit_transport cxgbit_transport = {
 628         .name                   = DRV_NAME,
 629         .transport_type         = ISCSI_CXGBIT,
 630         .rdma_shutdown          = false,
 631         .priv_size              = sizeof(struct cxgbit_cmd),
 632         .owner                  = THIS_MODULE,
 633         .iscsit_setup_np        = cxgbit_setup_np,
 634         .iscsit_accept_np       = cxgbit_accept_np,
 635         .iscsit_free_np         = cxgbit_free_np,
 636         .iscsit_free_conn       = cxgbit_free_conn,
 637         .iscsit_get_login_rx    = cxgbit_get_login_rx,
 638         .iscsit_put_login_tx    = cxgbit_put_login_tx,
 639         .iscsit_immediate_queue = iscsit_immediate_queue,
 640         .iscsit_response_queue  = iscsit_response_queue,
 641         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 642         .iscsit_queue_data_in   = iscsit_queue_rsp,
 643         .iscsit_queue_status    = iscsit_queue_rsp,
 644         .iscsit_xmit_pdu        = cxgbit_xmit_pdu,
 645         .iscsit_get_r2t_ttt     = cxgbit_get_r2t_ttt,
 646         .iscsit_get_rx_pdu      = cxgbit_get_rx_pdu,
 647         .iscsit_validate_params = cxgbit_validate_params,
 648         .iscsit_release_cmd     = cxgbit_release_cmd,
 649         .iscsit_aborted_task    = iscsit_aborted_task,
 650         .iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops,
 651 };
 652
 653 static struct cxgb4_uld_info cxgbit_uld_info = {
 654         .name           = DRV_NAME,
 655         .add            = cxgbit_uld_add,
 656         .state_change   = cxgbit_uld_state_change,
 657         .lro_rx_handler = cxgbit_uld_lro_rx_handler,
 658         .lro_flush      = cxgbit_uld_lro_flush,
 659 };
 660
 661 #ifdef CONFIG_CHELSIO_T4_DCB
 662 static struct notifier_block cxgbit_dcbevent_nb = {
 663         .notifier_call = cxgbit_dcbevent_notify,
 664 };
 665 #endif
 666
 667 static int __init cxgbit_init(void)
 668 {
 669         cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info);
 670         iscsit_register_transport(&cxgbit_transport);
 671
 672 #ifdef CONFIG_CHELSIO_T4_DCB
 673         pr_info("%s dcb enabled.\n", DRV_NAME);
 674         register_dcbevent_notifier(&cxgbit_dcbevent_nb);
 675 #endif
 676         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
 677                      sizeof(union cxgbit_skb_cb));
 678         return 0;
 679 }
 680
 681 static void __exit cxgbit_exit(void)
 682 {
 683         struct cxgbit_device *cdev, *tmp;
 684
 685 #ifdef CONFIG_CHELSIO_T4_DCB
 686         unregister_dcbevent_notifier(&cxgbit_dcbevent_nb);
 687 #endif
 688         mutex_lock(&cdev_list_lock);
 689         list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) {
 690                 list_del(&cdev->list);
 691                 cxgbit_put_cdev(cdev);
 692         }
 693         mutex_unlock(&cdev_list_lock);
 694         iscsit_unregister_transport(&cxgbit_transport);
 695         cxgb4_unregister_uld(CXGB4_ULD_ISCSIT);
 696 }
 697
 698 module_init(cxgbit_init);
 699 module_exit(cxgbit_exit);
 700
 701 MODULE_DESCRIPTION("Chelsio iSCSI target offload driver");
 702 MODULE_AUTHOR("Chelsio Communications");
 703 MODULE_VERSION(DRV_VERSION);
 704 MODULE_LICENSE("GPL");