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         spin_lock_init(&cdev->np_lock);
  62
  63         cdev->lldi = *lldi;
  64
  65         cxgbit_set_mdsl(cdev);
  66
  67         if (cxgbit_ddp_init(cdev) < 0) {
  68                 kfree(cdev);
  69                 return ERR_PTR(-EINVAL);
  70         }
  71
  72         if (!test_bit(CDEV_DDP_ENABLE, &cdev->flags))
  73                 pr_info("cdev %s ddp init failed\n",
  74                         pci_name(lldi->pdev));
  75
  76         if (lldi->fw_vers >= 0x10d2b00)
  77                 set_bit(CDEV_ISO_ENABLE, &cdev->flags);
  78
  79         spin_lock_init(&cdev->cskq.lock);
  80         INIT_LIST_HEAD(&cdev->cskq.list);
  81
  82         mutex_lock(&cdev_list_lock);
  83         list_add_tail(&cdev->list, &cdev_list_head);
  84         mutex_unlock(&cdev_list_lock);
  85
  86         pr_info("cdev %s added for iSCSI target transport\n",
  87                 pci_name(lldi->pdev));
  88
  89         return cdev;
  90 }
  91
  92 static void cxgbit_close_conn(struct cxgbit_device *cdev)
  93 {
  94         struct cxgbit_sock *csk;
  95         struct sk_buff *skb;
  96         bool wakeup_thread = false;
  97
  98         spin_lock_bh(&cdev->cskq.lock);
  99         list_for_each_entry(csk, &cdev->cskq.list, list) {
 100                 skb = alloc_skb(0, GFP_ATOMIC);
 101                 if (!skb)
 102                         continue;
 103
 104                 spin_lock_bh(&csk->rxq.lock);
 105                 __skb_queue_tail(&csk->rxq, skb);
 106                 if (skb_queue_len(&csk->rxq) == 1)
 107                         wakeup_thread = true;
 108                 spin_unlock_bh(&csk->rxq.lock);
 109
 110                 if (wakeup_thread) {
 111                         wake_up(&csk->waitq);
 112                         wakeup_thread = false;
 113                 }
 114         }
 115         spin_unlock_bh(&cdev->cskq.lock);
 116 }
 117
 118 static void cxgbit_detach_cdev(struct cxgbit_device *cdev)
 119 {
 120         bool free_cdev = false;
 121
 122         spin_lock_bh(&cdev->cskq.lock);
 123         if (list_empty(&cdev->cskq.list))
 124                 free_cdev = true;
 125         spin_unlock_bh(&cdev->cskq.lock);
 126
 127         if (free_cdev) {
 128                 mutex_lock(&cdev_list_lock);
 129                 list_del(&cdev->list);
 130                 mutex_unlock(&cdev_list_lock);
 131
 132                 cxgbit_put_cdev(cdev);
 133         } else {
 134                 cxgbit_close_conn(cdev);
 135         }
 136 }
 137
 138 static int cxgbit_uld_state_change(void *handle, enum cxgb4_state state)
 139 {
 140         struct cxgbit_device *cdev = handle;
 141
 142         switch (state) {
 143         case CXGB4_STATE_UP:
 144                 set_bit(CDEV_STATE_UP, &cdev->flags);
 145                 pr_info("cdev %s state UP.\n", pci_name(cdev->lldi.pdev));
 146                 break;
 147         case CXGB4_STATE_START_RECOVERY:
 148                 clear_bit(CDEV_STATE_UP, &cdev->flags);
 149                 cxgbit_close_conn(cdev);
 150                 pr_info("cdev %s state RECOVERY.\n", pci_name(cdev->lldi.pdev));
 151                 break;
 152         case CXGB4_STATE_DOWN:
 153                 pr_info("cdev %s state DOWN.\n", pci_name(cdev->lldi.pdev));
 154                 break;
 155         case CXGB4_STATE_DETACH:
 156                 clear_bit(CDEV_STATE_UP, &cdev->flags);
 157                 pr_info("cdev %s state DETACH.\n", pci_name(cdev->lldi.pdev));
 158                 cxgbit_detach_cdev(cdev);
 159                 break;
 160         default:
 161                 pr_info("cdev %s unknown state %d.\n",
 162                         pci_name(cdev->lldi.pdev), state);
 163                 break;
 164         }
 165         return 0;
 166 }
 167
 168 static void
 169 cxgbit_proc_ddp_status(unsigned int tid, struct cpl_rx_data_ddp *cpl,
 170                        struct cxgbit_lro_pdu_cb *pdu_cb)
 171 {
 172         unsigned int status = ntohl(cpl->ddpvld);
 173
 174         pdu_cb->flags |= PDUCBF_RX_STATUS;
 175         pdu_cb->ddigest = ntohl(cpl->ulp_crc);
 176         pdu_cb->pdulen = ntohs(cpl->len);
 177
 178         if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) {
 179                 pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", tid, status);
 180                 pdu_cb->flags |= PDUCBF_RX_HCRC_ERR;
 181         }
 182
 183         if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) {
 184                 pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", tid, status);
 185                 pdu_cb->flags |= PDUCBF_RX_DCRC_ERR;
 186         }
 187
 188         if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT))
 189                 pr_info("tid 0x%x, status 0x%x, pad bad.\n", tid, status);
 190
 191         if ((status & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) &&
 192             (!(pdu_cb->flags & PDUCBF_RX_DATA))) {
 193                 pdu_cb->flags |= PDUCBF_RX_DATA_DDPD;
 194         }
 195 }
 196
 197 static void
 198 cxgbit_lro_add_packet_rsp(struct sk_buff *skb, u8 op, const __be64 *rsp)
 199 {
 200         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 201         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
 202                                                 lro_cb->pdu_idx);
 203         struct cpl_rx_iscsi_ddp *cpl = (struct cpl_rx_iscsi_ddp *)(rsp + 1);
 204
 205         cxgbit_proc_ddp_status(lro_cb->csk->tid, cpl, pdu_cb);
 206
 207         if (pdu_cb->flags & PDUCBF_RX_HDR)
 208                 pdu_cb->complete = true;
 209
 210         lro_cb->complete = true;
 211         lro_cb->pdu_totallen += pdu_cb->pdulen;
 212         lro_cb->pdu_idx++;
 213 }
 214
 215 static void
 216 cxgbit_copy_frags(struct sk_buff *skb, const struct pkt_gl *gl,
 217                   unsigned int offset)
 218 {
 219         u8 skb_frag_idx = skb_shinfo(skb)->nr_frags;
 220         u8 i;
 221
 222         /* usually there's just one frag */
 223         __skb_fill_page_desc(skb, skb_frag_idx, gl->frags[0].page,
 224                              gl->frags[0].offset + offset,
 225                              gl->frags[0].size - offset);
 226         for (i = 1; i < gl->nfrags; i++)
 227                 __skb_fill_page_desc(skb, skb_frag_idx + i,
 228                                      gl->frags[i].page,
 229                                      gl->frags[i].offset,
 230                                      gl->frags[i].size);
 231
 232         skb_shinfo(skb)->nr_frags += gl->nfrags;
 233
 234         /* get a reference to the last page, we don't own it */
 235         get_page(gl->frags[gl->nfrags - 1].page);
 236 }
 237
 238 static void
 239 cxgbit_lro_add_packet_gl(struct sk_buff *skb, u8 op, const struct pkt_gl *gl)
 240 {
 241         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 242         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
 243                                                 lro_cb->pdu_idx);
 244         u32 len, offset;
 245
 246         if (op == CPL_ISCSI_HDR) {
 247                 struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)gl->va;
 248
 249                 offset = sizeof(struct cpl_iscsi_hdr);
 250                 pdu_cb->flags |= PDUCBF_RX_HDR;
 251                 pdu_cb->seq = ntohl(cpl->seq);
 252                 len = ntohs(cpl->len);
 253                 pdu_cb->hdr = gl->va + offset;
 254                 pdu_cb->hlen = len;
 255                 pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;
 256
 257                 if (unlikely(gl->nfrags > 1))
 258                         cxgbit_skcb_flags(skb) = 0;
 259
 260                 lro_cb->complete = false;
 261         } else {
 262                 struct cpl_iscsi_data *cpl = (struct cpl_iscsi_data *)gl->va;
 263
 264                 offset = sizeof(struct cpl_iscsi_data);
 265                 pdu_cb->flags |= PDUCBF_RX_DATA;
 266                 len = ntohs(cpl->len);
 267                 pdu_cb->dlen = len;
 268                 pdu_cb->doffset = lro_cb->offset;
 269                 pdu_cb->nr_dfrags = gl->nfrags;
 270                 pdu_cb->dfrag_idx = skb_shinfo(skb)->nr_frags;
 271         }
 272
 273         cxgbit_copy_frags(skb, gl, offset);
 274
 275         pdu_cb->frags += gl->nfrags;
 276         lro_cb->offset += len;
 277         skb->len += len;
 278         skb->data_len += len;
 279         skb->truesize += len;
 280 }
 281
 282 static struct sk_buff *
 283 cxgbit_lro_init_skb(struct cxgbit_sock *csk, u8 op, const struct pkt_gl *gl,
 284                     const __be64 *rsp, struct napi_struct *napi)
 285 {
 286         struct sk_buff *skb;
 287         struct cxgbit_lro_cb *lro_cb;
 288
 289         skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM);
 290
 291         if (unlikely(!skb))
 292                 return NULL;
 293
 294         memset(skb->data, 0, LRO_SKB_MAX_HEADROOM);
 295
 296         cxgbit_skcb_flags(skb) |= SKCBF_RX_LRO;
 297
 298         lro_cb = cxgbit_skb_lro_cb(skb);
 299
 300         cxgbit_get_csk(csk);
 301
 302         lro_cb->csk = csk;
 303
 304         return skb;
 305 }
 306
 307 static void cxgbit_queue_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
 308 {
 309         bool wakeup_thread = false;
 310
 311         spin_lock(&csk->rxq.lock);
 312         __skb_queue_tail(&csk->rxq, skb);
 313         if (skb_queue_len(&csk->rxq) == 1)
 314                 wakeup_thread = true;
 315         spin_unlock(&csk->rxq.lock);
 316
 317         if (wakeup_thread)
 318                 wake_up(&csk->waitq);
 319 }
 320
 321 static void cxgbit_lro_flush(struct t4_lro_mgr *lro_mgr, struct sk_buff *skb)
 322 {
 323         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 324         struct cxgbit_sock *csk = lro_cb->csk;
 325
 326         csk->lro_skb = NULL;
 327
 328         __skb_unlink(skb, &lro_mgr->lroq);
 329         cxgbit_queue_lro_skb(csk, skb);
 330
 331         cxgbit_put_csk(csk);
 332
 333         lro_mgr->lro_pkts++;
 334         lro_mgr->lro_session_cnt--;
 335 }
 336
 337 static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr)
 338 {
 339         struct sk_buff *skb;
 340
 341         while ((skb = skb_peek(&lro_mgr->lroq)))
 342                 cxgbit_lro_flush(lro_mgr, skb);
 343 }
 344
 345 static int
 346 cxgbit_lro_receive(struct cxgbit_sock *csk, u8 op, const __be64 *rsp,
 347                    const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
 348                    struct napi_struct *napi)
 349 {
 350         struct sk_buff *skb;
 351         struct cxgbit_lro_cb *lro_cb;
 352
 353         if (!csk) {
 354                 pr_err("%s: csk NULL, op 0x%x.\n", __func__, op);
 355                 goto out;
 356         }
 357
 358         if (csk->lro_skb)
 359                 goto add_packet;
 360
 361 start_lro:
 362         if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) {
 363                 cxgbit_uld_lro_flush(lro_mgr);
 364                 goto start_lro;
 365         }
 366
 367         skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi);
 368         if (unlikely(!skb))
 369                 goto out;
 370
 371         csk->lro_skb = skb;
 372
 373         __skb_queue_tail(&lro_mgr->lroq, skb);
 374         lro_mgr->lro_session_cnt++;
 375
 376 add_packet:
 377         skb = csk->lro_skb;
 378         lro_cb = cxgbit_skb_lro_cb(skb);
 379
 380         if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) >
 381             MAX_SKB_FRAGS) || (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) ||
 382             (lro_cb->pdu_idx >= MAX_SKB_FRAGS)) {
 383                 cxgbit_lro_flush(lro_mgr, skb);
 384                 goto start_lro;
 385         }
 386
 387         if (gl)
 388                 cxgbit_lro_add_packet_gl(skb, op, gl);
 389         else
 390                 cxgbit_lro_add_packet_rsp(skb, op, rsp);
 391
 392         lro_mgr->lro_merged++;
 393
 394         return 0;
 395
 396 out:
 397         return -1;
 398 }
 399
 400 static int
 401 cxgbit_uld_lro_rx_handler(void *hndl, const __be64 *rsp,
 402                           const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
 403                           struct napi_struct *napi)
 404 {
 405         struct cxgbit_device *cdev = hndl;
 406         struct cxgb4_lld_info *lldi = &cdev->lldi;
 407         struct cpl_tx_data *rpl = NULL;
 408         struct cxgbit_sock *csk = NULL;
 409         unsigned int tid = 0;
 410         struct sk_buff *skb;
 411         unsigned int op = *(u8 *)rsp;
 412         bool lro_flush = true;
 413
 414         switch (op) {
 415         case CPL_ISCSI_HDR:
 416         case CPL_ISCSI_DATA:
 417         case CPL_RX_ISCSI_DDP:
 418         case CPL_FW4_ACK:
 419                 lro_flush = false;
 420         case CPL_ABORT_RPL_RSS:
 421         case CPL_PASS_ESTABLISH:
 422         case CPL_PEER_CLOSE:
 423         case CPL_CLOSE_CON_RPL:
 424         case CPL_ABORT_REQ_RSS:
 425         case CPL_SET_TCB_RPL:
 426         case CPL_RX_DATA:
 427                 rpl = gl ? (struct cpl_tx_data *)gl->va :
 428                            (struct cpl_tx_data *)(rsp + 1);
 429                 tid = GET_TID(rpl);
 430                 csk = lookup_tid(lldi->tids, tid);
 431                 break;
 432         default:
 433                 break;
 434         }
 435
 436         if (csk && csk->lro_skb && lro_flush)
 437                 cxgbit_lro_flush(lro_mgr, csk->lro_skb);
 438
 439         if (!gl) {
 440                 unsigned int len;
 441
 442                 if (op == CPL_RX_ISCSI_DDP) {
 443                         if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr,
 444                                                 napi))
 445                                 return 0;
 446                 }
 447
 448                 len = 64 - sizeof(struct rsp_ctrl) - 8;
 449                 skb = napi_alloc_skb(napi, len);
 450                 if (!skb)
 451                         goto nomem;
 452                 __skb_put(skb, len);
 453                 skb_copy_to_linear_data(skb, &rsp[1], len);
 454         } else {
 455                 if (unlikely(op != *(u8 *)gl->va)) {
 456                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
 457                                 gl->va, be64_to_cpu(*rsp),
 458                                 be64_to_cpu(*(u64 *)gl->va),
 459                                 gl->tot_len);
 460                         return 0;
 461                 }
 462
 463                 if (op == CPL_ISCSI_HDR || op == CPL_ISCSI_DATA) {
 464                         if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr,
 465                                                 napi))
 466                                 return 0;
 467                 }
 468
 469 #define RX_PULL_LEN 128
 470                 skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
 471                 if (unlikely(!skb))
 472                         goto nomem;
 473         }
 474
 475         rpl = (struct cpl_tx_data *)skb->data;
 476         op = rpl->ot.opcode;
 477         cxgbit_skcb_rx_opcode(skb) = op;
 478
 479         pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
 480                  cdev, op, rpl->ot.opcode_tid,
 481                  ntohl(rpl->ot.opcode_tid), skb);
 482
 483         if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) {
 484                 cxgbit_cplhandlers[op](cdev, skb);
 485         } else {
 486                 pr_err("No handler for opcode 0x%x.\n", op);
 487                 __kfree_skb(skb);
 488         }
 489         return 0;
 490 nomem:
 491         pr_err("%s OOM bailing out.\n", __func__);
 492         return 1;
 493 }
 494
 495 #ifdef CONFIG_CHELSIO_T4_DCB
 496 struct cxgbit_dcb_work {
 497         struct dcb_app_type dcb_app;
 498         struct work_struct work;
 499 };
 500
 501 static void
 502 cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id,
 503                            u8 dcb_priority, u16 port_num)
 504 {
 505         struct cxgbit_sock *csk;
 506         struct sk_buff *skb;
 507         u16 local_port;
 508         bool wakeup_thread = false;
 509
 510         spin_lock_bh(&cdev->cskq.lock);
 511         list_for_each_entry(csk, &cdev->cskq.list, list) {
 512                 if (csk->port_id != port_id)
 513                         continue;
 514
 515                 if (csk->com.local_addr.ss_family == AF_INET6) {
 516                         struct sockaddr_in6 *sock_in6;
 517
 518                         sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr;
 519                         local_port = ntohs(sock_in6->sin6_port);
 520                 } else {
 521                         struct sockaddr_in *sock_in;
 522
 523                         sock_in = (struct sockaddr_in *)&csk->com.local_addr;
 524                         local_port = ntohs(sock_in->sin_port);
 525                 }
 526
 527                 if (local_port != port_num)
 528                         continue;
 529
 530                 if (csk->dcb_priority == dcb_priority)
 531                         continue;
 532
 533                 skb = alloc_skb(0, GFP_ATOMIC);
 534                 if (!skb)
 535                         continue;
 536
 537                 spin_lock(&csk->rxq.lock);
 538                 __skb_queue_tail(&csk->rxq, skb);
 539                 if (skb_queue_len(&csk->rxq) == 1)
 540                         wakeup_thread = true;
 541                 spin_unlock(&csk->rxq.lock);
 542
 543                 if (wakeup_thread) {
 544                         wake_up(&csk->waitq);
 545                         wakeup_thread = false;
 546                 }
 547         }
 548         spin_unlock_bh(&cdev->cskq.lock);
 549 }
 550
 551 static void cxgbit_dcb_workfn(struct work_struct *work)
 552 {
 553         struct cxgbit_dcb_work *dcb_work;
 554         struct net_device *ndev;
 555         struct cxgbit_device *cdev = NULL;
 556         struct dcb_app_type *iscsi_app;
 557         u8 priority, port_id = 0xff;
 558
 559         dcb_work = container_of(work, struct cxgbit_dcb_work, work);
 560         iscsi_app = &dcb_work->dcb_app;
 561
 562         if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
 563                 if (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)
 564                         goto out;
 565
 566                 priority = iscsi_app->app.priority;
 567
 568         } else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
 569                 if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
 570                         goto out;
 571
 572                 if (!iscsi_app->app.priority)
 573                         goto out;
 574
 575                 priority = ffs(iscsi_app->app.priority) - 1;
 576         } else {
 577                 goto out;
 578         }
 579
 580         pr_debug("priority for ifid %d is %u\n",
 581                  iscsi_app->ifindex, priority);
 582
 583         ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);
 584
 585         if (!ndev)
 586                 goto out;
 587
 588         mutex_lock(&cdev_list_lock);
 589         cdev = cxgbit_find_device(ndev, &port_id);
 590
 591         dev_put(ndev);
 592
 593         if (!cdev) {
 594                 mutex_unlock(&cdev_list_lock);
 595                 goto out;
 596         }
 597
 598         cxgbit_update_dcb_priority(cdev, port_id, priority,
 599                                    iscsi_app->app.protocol);
 600         mutex_unlock(&cdev_list_lock);
 601 out:
 602         kfree(dcb_work);
 603 }
 604
 605 static int
 606 cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action,
 607                        void *data)
 608 {
 609         struct cxgbit_dcb_work *dcb_work;
 610         struct dcb_app_type *dcb_app = data;
 611
 612         dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC);
 613         if (!dcb_work)
 614                 return NOTIFY_DONE;
 615
 616         dcb_work->dcb_app = *dcb_app;
 617         INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn);
 618         schedule_work(&dcb_work->work);
 619         return NOTIFY_OK;
 620 }
 621 #endif
 622
 623 static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
 624 {
 625         return TARGET_PROT_NORMAL;
 626 }
 627
 628 static struct iscsit_transport cxgbit_transport = {
 629         .name                   = DRV_NAME,
 630         .transport_type         = ISCSI_CXGBIT,
 631         .rdma_shutdown          = false,
 632         .priv_size              = sizeof(struct cxgbit_cmd),
 633         .owner                  = THIS_MODULE,
 634         .iscsit_setup_np        = cxgbit_setup_np,
 635         .iscsit_accept_np       = cxgbit_accept_np,
 636         .iscsit_free_np         = cxgbit_free_np,
 637         .iscsit_free_conn       = cxgbit_free_conn,
 638         .iscsit_get_login_rx    = cxgbit_get_login_rx,
 639         .iscsit_put_login_tx    = cxgbit_put_login_tx,
 640         .iscsit_immediate_queue = iscsit_immediate_queue,
 641         .iscsit_response_queue  = iscsit_response_queue,
 642         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 643         .iscsit_queue_data_in   = iscsit_queue_rsp,
 644         .iscsit_queue_status    = iscsit_queue_rsp,
 645         .iscsit_xmit_pdu        = cxgbit_xmit_pdu,
 646         .iscsit_get_r2t_ttt     = cxgbit_get_r2t_ttt,
 647         .iscsit_get_rx_pdu      = cxgbit_get_rx_pdu,
 648         .iscsit_validate_params = cxgbit_validate_params,
 649         .iscsit_release_cmd     = cxgbit_release_cmd,
 650         .iscsit_aborted_task    = iscsit_aborted_task,
 651         .iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops,
 652 };
 653
 654 static struct cxgb4_uld_info cxgbit_uld_info = {
 655         .name           = DRV_NAME,
 656         .nrxq           = MAX_ULD_QSETS,
 657         .rxq_size       = 1024,
 658         .lro            = true,
 659         .add            = cxgbit_uld_add,
 660         .state_change   = cxgbit_uld_state_change,
 661         .lro_rx_handler = cxgbit_uld_lro_rx_handler,
 662         .lro_flush      = cxgbit_uld_lro_flush,
 663 };
 664
 665 #ifdef CONFIG_CHELSIO_T4_DCB
 666 static struct notifier_block cxgbit_dcbevent_nb = {
 667         .notifier_call = cxgbit_dcbevent_notify,
 668 };
 669 #endif
 670
 671 static int __init cxgbit_init(void)
 672 {
 673         cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info);
 674         iscsit_register_transport(&cxgbit_transport);
 675
 676 #ifdef CONFIG_CHELSIO_T4_DCB
 677         pr_info("%s dcb enabled.\n", DRV_NAME);
 678         register_dcbevent_notifier(&cxgbit_dcbevent_nb);
 679 #endif
 680         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
 681                      sizeof(union cxgbit_skb_cb));
 682         return 0;
 683 }
 684
 685 static void __exit cxgbit_exit(void)
 686 {
 687         struct cxgbit_device *cdev, *tmp;
 688
 689 #ifdef CONFIG_CHELSIO_T4_DCB
 690         unregister_dcbevent_notifier(&cxgbit_dcbevent_nb);
 691 #endif
 692         mutex_lock(&cdev_list_lock);
 693         list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) {
 694                 list_del(&cdev->list);
 695                 cxgbit_put_cdev(cdev);
 696         }
 697         mutex_unlock(&cdev_list_lock);
 698         iscsit_unregister_transport(&cxgbit_transport);
 699         cxgb4_unregister_uld(CXGB4_ULD_ISCSIT);
 700 }
 701
 702 module_init(cxgbit_init);
 703 module_exit(cxgbit_exit);
 704
 705 MODULE_DESCRIPTION("Chelsio iSCSI target offload driver");
 706 MODULE_AUTHOR("Chelsio Communications");
 707 MODULE_VERSION(DRV_VERSION);
 708 MODULE_LICENSE("GPL");