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_process_ddpvld(struct cxgbit_sock *csk, struct cxgbit_lro_pdu_cb *pdu_cb,
 170                       u32 ddpvld)
 171 {
 172
 173         if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) {
 174                 pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", csk->tid, ddpvld);
 175                 pdu_cb->flags |= PDUCBF_RX_HCRC_ERR;
 176         }
 177
 178         if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) {
 179                 pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", csk->tid, ddpvld);
 180                 pdu_cb->flags |= PDUCBF_RX_DCRC_ERR;
 181         }
 182
 183         if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT))
 184                 pr_info("tid 0x%x, status 0x%x, pad bad.\n", csk->tid, ddpvld);
 185
 186         if ((ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) &&
 187             (!(pdu_cb->flags & PDUCBF_RX_DATA))) {
 188                 pdu_cb->flags |= PDUCBF_RX_DATA_DDPD;
 189         }
 190 }
 191
 192 static void
 193 cxgbit_lro_add_packet_rsp(struct sk_buff *skb, u8 op, const __be64 *rsp)
 194 {
 195         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 196         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
 197                                                 lro_cb->pdu_idx);
 198         struct cpl_rx_iscsi_ddp *cpl = (struct cpl_rx_iscsi_ddp *)(rsp + 1);
 199
 200         cxgbit_process_ddpvld(lro_cb->csk, pdu_cb, be32_to_cpu(cpl->ddpvld));
 201
 202         pdu_cb->flags |= PDUCBF_RX_STATUS;
 203         pdu_cb->ddigest = ntohl(cpl->ulp_crc);
 204         pdu_cb->pdulen = ntohs(cpl->len);
 205
 206         if (pdu_cb->flags & PDUCBF_RX_HDR)
 207                 pdu_cb->complete = true;
 208
 209         lro_cb->pdu_totallen += pdu_cb->pdulen;
 210         lro_cb->complete = true;
 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 if (op == CPL_ISCSI_DATA) {
 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                 lro_cb->complete = false;
 271         } else {
 272                 struct cpl_rx_iscsi_cmp *cpl;
 273
 274                 cpl = (struct cpl_rx_iscsi_cmp *)gl->va;
 275                 offset = sizeof(struct cpl_rx_iscsi_cmp);
 276                 pdu_cb->flags |= (PDUCBF_RX_HDR | PDUCBF_RX_STATUS);
 277                 len = be16_to_cpu(cpl->len);
 278                 pdu_cb->hdr = gl->va + offset;
 279                 pdu_cb->hlen = len;
 280                 pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;
 281                 pdu_cb->ddigest = be32_to_cpu(cpl->ulp_crc);
 282                 pdu_cb->pdulen = ntohs(cpl->len);
 283
 284                 if (unlikely(gl->nfrags > 1))
 285                         cxgbit_skcb_flags(skb) = 0;
 286
 287                 cxgbit_process_ddpvld(lro_cb->csk, pdu_cb,
 288                                       be32_to_cpu(cpl->ddpvld));
 289
 290                 if (pdu_cb->flags & PDUCBF_RX_DATA_DDPD) {
 291                         pdu_cb->flags |= PDUCBF_RX_DDP_CMP;
 292                         pdu_cb->complete = true;
 293                 } else if (pdu_cb->flags & PDUCBF_RX_DATA) {
 294                         pdu_cb->complete = true;
 295                 }
 296
 297                 lro_cb->pdu_totallen += pdu_cb->hlen + pdu_cb->dlen;
 298                 lro_cb->complete = true;
 299                 lro_cb->pdu_idx++;
 300         }
 301
 302         cxgbit_copy_frags(skb, gl, offset);
 303
 304         pdu_cb->frags += gl->nfrags;
 305         lro_cb->offset += len;
 306         skb->len += len;
 307         skb->data_len += len;
 308         skb->truesize += len;
 309 }
 310
 311 static struct sk_buff *
 312 cxgbit_lro_init_skb(struct cxgbit_sock *csk, u8 op, const struct pkt_gl *gl,
 313                     const __be64 *rsp, struct napi_struct *napi)
 314 {
 315         struct sk_buff *skb;
 316         struct cxgbit_lro_cb *lro_cb;
 317
 318         skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM);
 319
 320         if (unlikely(!skb))
 321                 return NULL;
 322
 323         memset(skb->data, 0, LRO_SKB_MAX_HEADROOM);
 324
 325         cxgbit_skcb_flags(skb) |= SKCBF_RX_LRO;
 326
 327         lro_cb = cxgbit_skb_lro_cb(skb);
 328
 329         cxgbit_get_csk(csk);
 330
 331         lro_cb->csk = csk;
 332
 333         return skb;
 334 }
 335
 336 static void cxgbit_queue_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
 337 {
 338         bool wakeup_thread = false;
 339
 340         spin_lock(&csk->rxq.lock);
 341         __skb_queue_tail(&csk->rxq, skb);
 342         if (skb_queue_len(&csk->rxq) == 1)
 343                 wakeup_thread = true;
 344         spin_unlock(&csk->rxq.lock);
 345
 346         if (wakeup_thread)
 347                 wake_up(&csk->waitq);
 348 }
 349
 350 static void cxgbit_lro_flush(struct t4_lro_mgr *lro_mgr, struct sk_buff *skb)
 351 {
 352         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
 353         struct cxgbit_sock *csk = lro_cb->csk;
 354
 355         csk->lro_skb = NULL;
 356
 357         __skb_unlink(skb, &lro_mgr->lroq);
 358         cxgbit_queue_lro_skb(csk, skb);
 359
 360         cxgbit_put_csk(csk);
 361
 362         lro_mgr->lro_pkts++;
 363         lro_mgr->lro_session_cnt--;
 364 }
 365
 366 static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr)
 367 {
 368         struct sk_buff *skb;
 369
 370         while ((skb = skb_peek(&lro_mgr->lroq)))
 371                 cxgbit_lro_flush(lro_mgr, skb);
 372 }
 373
 374 static int
 375 cxgbit_lro_receive(struct cxgbit_sock *csk, u8 op, const __be64 *rsp,
 376                    const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
 377                    struct napi_struct *napi)
 378 {
 379         struct sk_buff *skb;
 380         struct cxgbit_lro_cb *lro_cb;
 381
 382         if (!csk) {
 383                 pr_err("%s: csk NULL, op 0x%x.\n", __func__, op);
 384                 goto out;
 385         }
 386
 387         if (csk->lro_skb)
 388                 goto add_packet;
 389
 390 start_lro:
 391         if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) {
 392                 cxgbit_uld_lro_flush(lro_mgr);
 393                 goto start_lro;
 394         }
 395
 396         skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi);
 397         if (unlikely(!skb))
 398                 goto out;
 399
 400         csk->lro_skb = skb;
 401
 402         __skb_queue_tail(&lro_mgr->lroq, skb);
 403         lro_mgr->lro_session_cnt++;
 404
 405 add_packet:
 406         skb = csk->lro_skb;
 407         lro_cb = cxgbit_skb_lro_cb(skb);
 408
 409         if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) >
 410             MAX_SKB_FRAGS) || (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) ||
 411             (lro_cb->pdu_idx >= MAX_SKB_FRAGS)) {
 412                 cxgbit_lro_flush(lro_mgr, skb);
 413                 goto start_lro;
 414         }
 415
 416         if (gl)
 417                 cxgbit_lro_add_packet_gl(skb, op, gl);
 418         else
 419                 cxgbit_lro_add_packet_rsp(skb, op, rsp);
 420
 421         lro_mgr->lro_merged++;
 422
 423         return 0;
 424
 425 out:
 426         return -1;
 427 }
 428
 429 static int
 430 cxgbit_uld_lro_rx_handler(void *hndl, const __be64 *rsp,
 431                           const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
 432                           struct napi_struct *napi)
 433 {
 434         struct cxgbit_device *cdev = hndl;
 435         struct cxgb4_lld_info *lldi = &cdev->lldi;
 436         struct cpl_tx_data *rpl = NULL;
 437         struct cxgbit_sock *csk = NULL;
 438         unsigned int tid = 0;
 439         struct sk_buff *skb;
 440         unsigned int op = *(u8 *)rsp;
 441         bool lro_flush = true;
 442
 443         switch (op) {
 444         case CPL_ISCSI_HDR:
 445         case CPL_ISCSI_DATA:
 446         case CPL_RX_ISCSI_CMP:
 447         case CPL_RX_ISCSI_DDP:
 448         case CPL_FW4_ACK:
 449                 lro_flush = false;
 450         case CPL_ABORT_RPL_RSS:
 451         case CPL_PASS_ESTABLISH:
 452         case CPL_PEER_CLOSE:
 453         case CPL_CLOSE_CON_RPL:
 454         case CPL_ABORT_REQ_RSS:
 455         case CPL_SET_TCB_RPL:
 456         case CPL_RX_DATA:
 457                 rpl = gl ? (struct cpl_tx_data *)gl->va :
 458                            (struct cpl_tx_data *)(rsp + 1);
 459                 tid = GET_TID(rpl);
 460                 csk = lookup_tid(lldi->tids, tid);
 461                 break;
 462         default:
 463                 break;
 464         }
 465
 466         if (csk && csk->lro_skb && lro_flush)
 467                 cxgbit_lro_flush(lro_mgr, csk->lro_skb);
 468
 469         if (!gl) {
 470                 unsigned int len;
 471
 472                 if (op == CPL_RX_ISCSI_DDP) {
 473                         if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr,
 474                                                 napi))
 475                                 return 0;
 476                 }
 477
 478                 len = 64 - sizeof(struct rsp_ctrl) - 8;
 479                 skb = napi_alloc_skb(napi, len);
 480                 if (!skb)
 481                         goto nomem;
 482                 __skb_put(skb, len);
 483                 skb_copy_to_linear_data(skb, &rsp[1], len);
 484         } else {
 485                 if (unlikely(op != *(u8 *)gl->va)) {
 486                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
 487                                 gl->va, be64_to_cpu(*rsp),
 488                                 get_unaligned_be64(gl->va),
 489                                 gl->tot_len);
 490                         return 0;
 491                 }
 492
 493                 if ((op == CPL_ISCSI_HDR) || (op == CPL_ISCSI_DATA) ||
 494                     (op == CPL_RX_ISCSI_CMP)) {
 495                         if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr,
 496                                                 napi))
 497                                 return 0;
 498                 }
 499
 500 #define RX_PULL_LEN 128
 501                 skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
 502                 if (unlikely(!skb))
 503                         goto nomem;
 504         }
 505
 506         rpl = (struct cpl_tx_data *)skb->data;
 507         op = rpl->ot.opcode;
 508         cxgbit_skcb_rx_opcode(skb) = op;
 509
 510         pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
 511                  cdev, op, rpl->ot.opcode_tid,
 512                  ntohl(rpl->ot.opcode_tid), skb);
 513
 514         if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) {
 515                 cxgbit_cplhandlers[op](cdev, skb);
 516         } else {
 517                 pr_err("No handler for opcode 0x%x.\n", op);
 518                 __kfree_skb(skb);
 519         }
 520         return 0;
 521 nomem:
 522         pr_err("%s OOM bailing out.\n", __func__);
 523         return 1;
 524 }
 525
 526 #ifdef CONFIG_CHELSIO_T4_DCB
 527 struct cxgbit_dcb_work {
 528         struct dcb_app_type dcb_app;
 529         struct work_struct work;
 530 };
 531
 532 static void
 533 cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id,
 534                            u8 dcb_priority, u16 port_num)
 535 {
 536         struct cxgbit_sock *csk;
 537         struct sk_buff *skb;
 538         u16 local_port;
 539         bool wakeup_thread = false;
 540
 541         spin_lock_bh(&cdev->cskq.lock);
 542         list_for_each_entry(csk, &cdev->cskq.list, list) {
 543                 if (csk->port_id != port_id)
 544                         continue;
 545
 546                 if (csk->com.local_addr.ss_family == AF_INET6) {
 547                         struct sockaddr_in6 *sock_in6;
 548
 549                         sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr;
 550                         local_port = ntohs(sock_in6->sin6_port);
 551                 } else {
 552                         struct sockaddr_in *sock_in;
 553
 554                         sock_in = (struct sockaddr_in *)&csk->com.local_addr;
 555                         local_port = ntohs(sock_in->sin_port);
 556                 }
 557
 558                 if (local_port != port_num)
 559                         continue;
 560
 561                 if (csk->dcb_priority == dcb_priority)
 562                         continue;
 563
 564                 skb = alloc_skb(0, GFP_ATOMIC);
 565                 if (!skb)
 566                         continue;
 567
 568                 spin_lock(&csk->rxq.lock);
 569                 __skb_queue_tail(&csk->rxq, skb);
 570                 if (skb_queue_len(&csk->rxq) == 1)
 571                         wakeup_thread = true;
 572                 spin_unlock(&csk->rxq.lock);
 573
 574                 if (wakeup_thread) {
 575                         wake_up(&csk->waitq);
 576                         wakeup_thread = false;
 577                 }
 578         }
 579         spin_unlock_bh(&cdev->cskq.lock);
 580 }
 581
 582 static void cxgbit_dcb_workfn(struct work_struct *work)
 583 {
 584         struct cxgbit_dcb_work *dcb_work;
 585         struct net_device *ndev;
 586         struct cxgbit_device *cdev = NULL;
 587         struct dcb_app_type *iscsi_app;
 588         u8 priority, port_id = 0xff;
 589
 590         dcb_work = container_of(work, struct cxgbit_dcb_work, work);
 591         iscsi_app = &dcb_work->dcb_app;
 592
 593         if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
 594                 if (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)
 595                         goto out;
 596
 597                 priority = iscsi_app->app.priority;
 598
 599         } else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
 600                 if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
 601                         goto out;
 602
 603                 if (!iscsi_app->app.priority)
 604                         goto out;
 605
 606                 priority = ffs(iscsi_app->app.priority) - 1;
 607         } else {
 608                 goto out;
 609         }
 610
 611         pr_debug("priority for ifid %d is %u\n",
 612                  iscsi_app->ifindex, priority);
 613
 614         ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);
 615
 616         if (!ndev)
 617                 goto out;
 618
 619         mutex_lock(&cdev_list_lock);
 620         cdev = cxgbit_find_device(ndev, &port_id);
 621
 622         dev_put(ndev);
 623
 624         if (!cdev) {
 625                 mutex_unlock(&cdev_list_lock);
 626                 goto out;
 627         }
 628
 629         cxgbit_update_dcb_priority(cdev, port_id, priority,
 630                                    iscsi_app->app.protocol);
 631         mutex_unlock(&cdev_list_lock);
 632 out:
 633         kfree(dcb_work);
 634 }
 635
 636 static int
 637 cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action,
 638                        void *data)
 639 {
 640         struct cxgbit_dcb_work *dcb_work;
 641         struct dcb_app_type *dcb_app = data;
 642
 643         dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC);
 644         if (!dcb_work)
 645                 return NOTIFY_DONE;
 646
 647         dcb_work->dcb_app = *dcb_app;
 648         INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn);
 649         schedule_work(&dcb_work->work);
 650         return NOTIFY_OK;
 651 }
 652 #endif
 653
 654 static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
 655 {
 656         return TARGET_PROT_NORMAL;
 657 }
 658
 659 static struct iscsit_transport cxgbit_transport = {
 660         .name                   = DRV_NAME,
 661         .transport_type         = ISCSI_CXGBIT,
 662         .rdma_shutdown          = false,
 663         .priv_size              = sizeof(struct cxgbit_cmd),
 664         .owner                  = THIS_MODULE,
 665         .iscsit_setup_np        = cxgbit_setup_np,
 666         .iscsit_accept_np       = cxgbit_accept_np,
 667         .iscsit_free_np         = cxgbit_free_np,
 668         .iscsit_free_conn       = cxgbit_free_conn,
 669         .iscsit_get_login_rx    = cxgbit_get_login_rx,
 670         .iscsit_put_login_tx    = cxgbit_put_login_tx,
 671         .iscsit_immediate_queue = iscsit_immediate_queue,
 672         .iscsit_response_queue  = iscsit_response_queue,
 673         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 674         .iscsit_queue_data_in   = iscsit_queue_rsp,
 675         .iscsit_queue_status    = iscsit_queue_rsp,
 676         .iscsit_xmit_pdu        = cxgbit_xmit_pdu,
 677         .iscsit_get_r2t_ttt     = cxgbit_get_r2t_ttt,
 678         .iscsit_get_rx_pdu      = cxgbit_get_rx_pdu,
 679         .iscsit_validate_params = cxgbit_validate_params,
 680         .iscsit_release_cmd     = cxgbit_release_cmd,
 681         .iscsit_aborted_task    = iscsit_aborted_task,
 682         .iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops,
 683 };
 684
 685 static struct cxgb4_uld_info cxgbit_uld_info = {
 686         .name           = DRV_NAME,
 687         .nrxq           = MAX_ULD_QSETS,
 688         .ntxq           = MAX_ULD_QSETS,
 689         .rxq_size       = 1024,
 690         .lro            = true,
 691         .add            = cxgbit_uld_add,
 692         .state_change   = cxgbit_uld_state_change,
 693         .lro_rx_handler = cxgbit_uld_lro_rx_handler,
 694         .lro_flush      = cxgbit_uld_lro_flush,
 695 };
 696
 697 #ifdef CONFIG_CHELSIO_T4_DCB
 698 static struct notifier_block cxgbit_dcbevent_nb = {
 699         .notifier_call = cxgbit_dcbevent_notify,
 700 };
 701 #endif
 702
 703 static int __init cxgbit_init(void)
 704 {
 705         cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info);
 706         iscsit_register_transport(&cxgbit_transport);
 707
 708 #ifdef CONFIG_CHELSIO_T4_DCB
 709         pr_info("%s dcb enabled.\n", DRV_NAME);
 710         register_dcbevent_notifier(&cxgbit_dcbevent_nb);
 711 #endif
 712         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
 713                      sizeof(union cxgbit_skb_cb));
 714         return 0;
 715 }
 716
 717 static void __exit cxgbit_exit(void)
 718 {
 719         struct cxgbit_device *cdev, *tmp;
 720
 721 #ifdef CONFIG_CHELSIO_T4_DCB
 722         unregister_dcbevent_notifier(&cxgbit_dcbevent_nb);
 723 #endif
 724         mutex_lock(&cdev_list_lock);
 725         list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) {
 726                 list_del(&cdev->list);
 727                 cxgbit_put_cdev(cdev);
 728         }
 729         mutex_unlock(&cdev_list_lock);
 730         iscsit_unregister_transport(&cxgbit_transport);
 731         cxgb4_unregister_uld(CXGB4_ULD_ISCSIT);
 732 }
 733
 734 module_init(cxgbit_init);
 735 module_exit(cxgbit_exit);
 736
 737 MODULE_DESCRIPTION("Chelsio iSCSI target offload driver");
 738 MODULE_AUTHOR("Chelsio Communications");
 739 MODULE_VERSION(DRV_VERSION);
 740 MODULE_LICENSE("GPL");