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