drivers/scsi/snic/snic_io.c

   1 /*
   2  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  */
  17
  18 #include <linux/errno.h>
  19 #include <linux/pci.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/interrupt.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/mempool.h>
  26 #include <scsi/scsi_tcq.h>
  27
  28 #include "snic_io.h"
  29 #include "snic.h"
  30 #include "cq_enet_desc.h"
  31 #include "snic_fwint.h"
  32
  33 static void
  34 snic_wq_cmpl_frame_send(struct vnic_wq *wq,
  35                             struct cq_desc *cq_desc,
  36                             struct vnic_wq_buf *buf,
  37                             void *opaque)
  38 {
  39         struct snic *snic = svnic_dev_priv(wq->vdev);
  40
  41         SNIC_BUG_ON(buf->os_buf == NULL);
  42
  43         if (snic_log_level & SNIC_DESC_LOGGING)
  44                 SNIC_HOST_INFO(snic->shost,
  45                                "Ack received for snic_host_req %p.\n",
  46                                buf->os_buf);
  47
  48         SNIC_TRC(snic->shost->host_no, 0, 0,
  49                  ((ulong)(buf->os_buf) - sizeof(struct snic_req_info)), 0, 0,
  50                  0);
  51
  52         buf->os_buf = NULL;
  53 }
  54
  55 static int
  56 snic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
  57                           struct cq_desc *cq_desc,
  58                           u8 type,
  59                           u16 q_num,
  60                           u16 cmpl_idx,
  61                           void *opaque)
  62 {
  63         struct snic *snic = svnic_dev_priv(vdev);
  64         unsigned long flags;
  65
  66         SNIC_BUG_ON(q_num != 0);
  67
  68         spin_lock_irqsave(&snic->wq_lock[q_num], flags);
  69         svnic_wq_service(&snic->wq[q_num],
  70                          cq_desc,
  71                          cmpl_idx,
  72                          snic_wq_cmpl_frame_send,
  73                          NULL);
  74         spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
  75
  76         return 0;
  77 } /* end of snic_cmpl_handler_cont */
  78
  79 int
  80 snic_wq_cmpl_handler(struct snic *snic, int work_to_do)
  81 {
  82         unsigned int work_done = 0;
  83         unsigned int i;
  84
  85         snic->s_stats.misc.last_ack_time = jiffies;
  86         for (i = 0; i < snic->wq_count; i++) {
  87                 work_done += svnic_cq_service(&snic->cq[i],
  88                                               work_to_do,
  89                                               snic_wq_cmpl_handler_cont,
  90                                               NULL);
  91         }
  92
  93         return work_done;
  94 } /* end of snic_wq_cmpl_handler */
  95
  96 void
  97 snic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
  98 {
  99
 100         struct snic_host_req *req = buf->os_buf;
 101         struct snic *snic = svnic_dev_priv(wq->vdev);
 102         struct snic_req_info *rqi = NULL;
 103         unsigned long flags;
 104
 105         pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);
 106
 107         rqi = req_to_rqi(req);
 108         spin_lock_irqsave(&snic->spl_cmd_lock, flags);
 109         if (list_empty(&rqi->list)) {
 110                 spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
 111                 goto end;
 112         }
 113
 114         SNIC_BUG_ON(rqi->list.next == NULL); /* if not added to spl_cmd_list */
 115         list_del_init(&rqi->list);
 116         spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
 117
 118         if (rqi->sge_va) {
 119                 snic_pci_unmap_rsp_buf(snic, rqi);
 120                 kfree((void *)rqi->sge_va);
 121                 rqi->sge_va = 0;
 122         }
 123         snic_req_free(snic, rqi);
 124         SNIC_HOST_INFO(snic->shost, "snic_free_wq_buf .. freed.\n");
 125
 126 end:
 127         return;
 128 }
 129
 130 /* Criteria to select work queue in multi queue mode */
 131 static int
 132 snic_select_wq(struct snic *snic)
 133 {
 134         /* No multi queue support for now */
 135         BUILD_BUG_ON(SNIC_WQ_MAX > 1);
 136
 137         return 0;
 138 }
 139
 140 static int
 141 snic_wqdesc_avail(struct snic *snic, int q_num, int req_type)
 142 {
 143         int nr_wqdesc = snic->config.wq_enet_desc_count;
 144
 145         if (q_num > 0) {
 146                 /*
 147                  * Multi Queue case, additional care is required.
 148                  * Per WQ active requests need to be maintained.
 149                  */
 150                 SNIC_HOST_INFO(snic->shost, "desc_avail: Multi Queue case.\n");
 151                 SNIC_BUG_ON(q_num > 0);
 152
 153                 return -1;
 154         }
 155
 156         nr_wqdesc -= atomic64_read(&snic->s_stats.fw.actv_reqs);
 157
 158         return ((req_type == SNIC_REQ_HBA_RESET) ? nr_wqdesc : nr_wqdesc - 1);
 159 }
 160
 161 int
 162 snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
 163 {
 164         dma_addr_t pa = 0;
 165         unsigned long flags;
 166         struct snic_fw_stats *fwstats = &snic->s_stats.fw;
 167         struct snic_host_req *req = (struct snic_host_req *) os_buf;
 168         long act_reqs;
 169         long desc_avail = 0;
 170         int q_num = 0;
 171
 172         snic_print_desc(__func__, os_buf, len);
 173
 174         /* Map request buffer */
 175         pa = pci_map_single(snic->pdev, os_buf, len, PCI_DMA_TODEVICE);
 176         if (pci_dma_mapping_error(snic->pdev, pa)) {
 177                 SNIC_HOST_ERR(snic->shost, "qdesc: PCI DMA Mapping Fail.\n");
 178
 179                 return -ENOMEM;
 180         }
 181
 182         req->req_pa = (ulong)pa;
 183
 184         q_num = snic_select_wq(snic);
 185
 186         spin_lock_irqsave(&snic->wq_lock[q_num], flags);
 187         desc_avail = snic_wqdesc_avail(snic, q_num, req->hdr.type);
 188         if (desc_avail <= 0) {
 189                 pci_unmap_single(snic->pdev, pa, len, PCI_DMA_TODEVICE);
 190                 req->req_pa = 0;
 191                 spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
 192                 atomic64_inc(&snic->s_stats.misc.wq_alloc_fail);
 193                 SNIC_DBG("host = %d, WQ is Full\n", snic->shost->host_no);
 194
 195                 return -ENOMEM;
 196         }
 197
 198         snic_queue_wq_eth_desc(&snic->wq[q_num], os_buf, pa, len, 0, 0, 1);
 199         /*
 200          * Update stats
 201          * note: when multi queue enabled, fw actv_reqs should be per queue.
 202          */
 203         act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
 204         spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
 205
 206         if (act_reqs > atomic64_read(&fwstats->max_actv_reqs))
 207                 atomic64_set(&fwstats->max_actv_reqs, act_reqs);
 208
 209         return 0;
 210 } /* end of snic_queue_wq_desc() */
 211
 212 /*
 213  * snic_handle_untagged_req: Adds snic specific requests to spl_cmd_list.
 214  * Purpose : Used during driver unload to clean up the requests.
 215  */
 216 void
 217 snic_handle_untagged_req(struct snic *snic, struct snic_req_info *rqi)
 218 {
 219         unsigned long flags;
 220
 221         INIT_LIST_HEAD(&rqi->list);
 222
 223         spin_lock_irqsave(&snic->spl_cmd_lock, flags);
 224         list_add_tail(&rqi->list, &snic->spl_cmd_list);
 225         spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
 226 }
 227
 228 /*
 229  * snic_req_init:
 230  * Allocates snic_req_info + snic_host_req + sgl data, and initializes.
 231  */
 232 struct snic_req_info *
 233 snic_req_init(struct snic *snic, int sg_cnt)
 234 {
 235         u8 typ;
 236         struct snic_req_info *rqi = NULL;
 237
 238         typ = (sg_cnt <= SNIC_REQ_CACHE_DFLT_SGL) ?
 239                 SNIC_REQ_CACHE_DFLT_SGL : SNIC_REQ_CACHE_MAX_SGL;
 240
 241         rqi = mempool_alloc(snic->req_pool[typ], GFP_ATOMIC);
 242         if (!rqi) {
 243                 atomic64_inc(&snic->s_stats.io.alloc_fail);
 244                 SNIC_HOST_ERR(snic->shost,
 245                               "Failed to allocate memory from snic req pool id = %d\n",
 246                               typ);
 247                 return rqi;
 248         }
 249
 250         memset(rqi, 0, sizeof(*rqi));
 251         rqi->rq_pool_type = typ;
 252         rqi->start_time = jiffies;
 253         rqi->req = (struct snic_host_req *) (rqi + 1);
 254         rqi->req_len = sizeof(struct snic_host_req);
 255         rqi->snic = snic;
 256
 257         rqi->req = (struct snic_host_req *)(rqi + 1);
 258
 259         if (sg_cnt == 0)
 260                 goto end;
 261
 262         rqi->req_len += (sg_cnt * sizeof(struct snic_sg_desc));
 263
 264         if (sg_cnt > atomic64_read(&snic->s_stats.io.max_sgl))
 265                 atomic64_set(&snic->s_stats.io.max_sgl, sg_cnt);
 266
 267         SNIC_BUG_ON(sg_cnt > SNIC_MAX_SG_DESC_CNT);
 268         atomic64_inc(&snic->s_stats.io.sgl_cnt[sg_cnt - 1]);
 269
 270 end:
 271         memset(rqi->req, 0, rqi->req_len);
 272
 273         /* pre initialization of init_ctx to support req_to_rqi */
 274         rqi->req->hdr.init_ctx = (ulong) rqi;
 275
 276         SNIC_SCSI_DBG(snic->shost, "Req_alloc:rqi = %p allocatd.\n", rqi);
 277
 278         return rqi;
 279 } /* end of snic_req_init */
 280
 281 /*
 282  * snic_abort_req_init : Inits abort request.
 283  */
 284 struct snic_host_req *
 285 snic_abort_req_init(struct snic *snic, struct snic_req_info *rqi)
 286 {
 287         struct snic_host_req *req = NULL;
 288
 289         SNIC_BUG_ON(!rqi);
 290
 291         /* If abort to be issued second time, then reuse */
 292         if (rqi->abort_req)
 293                 return rqi->abort_req;
 294
 295
 296         req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
 297         if (!req) {
 298                 SNIC_HOST_ERR(snic->shost, "abts:Failed to alloc tm req.\n");
 299                 WARN_ON_ONCE(1);
 300
 301                 return NULL;
 302         }
 303
 304         rqi->abort_req = req;
 305         memset(req, 0, sizeof(struct snic_host_req));
 306         /* pre initialization of init_ctx to support req_to_rqi */
 307         req->hdr.init_ctx = (ulong) rqi;
 308
 309         return req;
 310 } /* end of snic_abort_req_init */
 311
 312 /*
 313  * snic_dr_req_init : Inits device reset req
 314  */
 315 struct snic_host_req *
 316 snic_dr_req_init(struct snic *snic, struct snic_req_info *rqi)
 317 {
 318         struct snic_host_req *req = NULL;
 319
 320         SNIC_BUG_ON(!rqi);
 321
 322         req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
 323         if (!req) {
 324                 SNIC_HOST_ERR(snic->shost, "dr:Failed to alloc tm req.\n");
 325                 WARN_ON_ONCE(1);
 326
 327                 return NULL;
 328         }
 329
 330         SNIC_BUG_ON(rqi->dr_req != NULL);
 331         rqi->dr_req = req;
 332         memset(req, 0, sizeof(struct snic_host_req));
 333         /* pre initialization of init_ctx to support req_to_rqi */
 334         req->hdr.init_ctx = (ulong) rqi;
 335
 336         return req;
 337 } /* end of snic_dr_req_init */
 338
 339 /* frees snic_req_info and snic_host_req */
 340 void
 341 snic_req_free(struct snic *snic, struct snic_req_info *rqi)
 342 {
 343         SNIC_BUG_ON(rqi->req == rqi->abort_req);
 344         SNIC_BUG_ON(rqi->req == rqi->dr_req);
 345         SNIC_BUG_ON(rqi->sge_va != 0);
 346
 347         SNIC_SCSI_DBG(snic->shost,
 348                       "Req_free:rqi %p:ioreq %p:abt %p:dr %p\n",
 349                       rqi, rqi->req, rqi->abort_req, rqi->dr_req);
 350
 351         if (rqi->abort_req) {
 352                 if (rqi->abort_req->req_pa)
 353                         pci_unmap_single(snic->pdev,
 354                                          rqi->abort_req->req_pa,
 355                                          sizeof(struct snic_host_req),
 356                                          PCI_DMA_TODEVICE);
 357
 358                 mempool_free(rqi->abort_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
 359         }
 360
 361         if (rqi->dr_req) {
 362                 if (rqi->dr_req->req_pa)
 363                         pci_unmap_single(snic->pdev,
 364                                          rqi->dr_req->req_pa,
 365                                          sizeof(struct snic_host_req),
 366                                          PCI_DMA_TODEVICE);
 367
 368                 mempool_free(rqi->dr_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
 369         }
 370
 371         if (rqi->req->req_pa)
 372                 pci_unmap_single(snic->pdev,
 373                                  rqi->req->req_pa,
 374                                  rqi->req_len,
 375                                  PCI_DMA_TODEVICE);
 376
 377         mempool_free(rqi, snic->req_pool[rqi->rq_pool_type]);
 378 }
 379
 380 void
 381 snic_pci_unmap_rsp_buf(struct snic *snic, struct snic_req_info *rqi)
 382 {
 383         struct snic_sg_desc *sgd;
 384
 385         sgd = req_to_sgl(rqi_to_req(rqi));
 386         SNIC_BUG_ON(sgd[0].addr == 0);
 387         pci_unmap_single(snic->pdev,
 388                          le64_to_cpu(sgd[0].addr),
 389                          le32_to_cpu(sgd[0].len),
 390                          PCI_DMA_FROMDEVICE);
 391 }
 392
 393 /*
 394  * snic_free_all_untagged_reqs: Walks through untagged reqs and frees them.
 395  */
 396 void
 397 snic_free_all_untagged_reqs(struct snic *snic)
 398 {
 399         struct snic_req_info *rqi;
 400         struct list_head *cur, *nxt;
 401         unsigned long flags;
 402
 403         spin_lock_irqsave(&snic->spl_cmd_lock, flags);
 404         list_for_each_safe(cur, nxt, &snic->spl_cmd_list) {
 405                 rqi = list_entry(cur, struct snic_req_info, list);
 406                 list_del_init(&rqi->list);
 407                 if (rqi->sge_va) {
 408                         snic_pci_unmap_rsp_buf(snic, rqi);
 409                         kfree((void *)rqi->sge_va);
 410                         rqi->sge_va = 0;
 411                 }
 412
 413                 snic_req_free(snic, rqi);
 414         }
 415         spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
 416 }
 417
 418 /*
 419  * snic_release_untagged_req : Unlinks the untagged req and frees it.
 420  */
 421 void
 422 snic_release_untagged_req(struct snic *snic, struct snic_req_info *rqi)
 423 {
 424         unsigned long flags;
 425
 426         spin_lock_irqsave(&snic->snic_lock, flags);
 427         if (snic->in_remove) {
 428                 spin_unlock_irqrestore(&snic->snic_lock, flags);
 429                 goto end;
 430         }
 431         spin_unlock_irqrestore(&snic->snic_lock, flags);
 432
 433         spin_lock_irqsave(&snic->spl_cmd_lock, flags);
 434         if (list_empty(&rqi->list)) {
 435                 spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
 436                 goto end;
 437         }
 438         list_del_init(&rqi->list);
 439         spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
 440         snic_req_free(snic, rqi);
 441
 442 end:
 443         return;
 444 }
 445
 446 /* dump buf in hex fmt */
 447 void
 448 snic_hex_dump(char *pfx, char *data, int len)
 449 {
 450         SNIC_INFO("%s Dumping Data of Len = %d\n", pfx, len);
 451         print_hex_dump_bytes(pfx, DUMP_PREFIX_NONE, data, len);
 452 }
 453
 454 #define LINE_BUFSZ      128     /* for snic_print_desc fn */
 455 static void
 456 snic_dump_desc(const char *fn, char *os_buf, int len)
 457 {
 458         struct snic_host_req *req = (struct snic_host_req *) os_buf;
 459         struct snic_fw_req *fwreq = (struct snic_fw_req *) os_buf;
 460         struct snic_req_info *rqi = NULL;
 461         char line[LINE_BUFSZ] = { '\0' };
 462         char *cmd_str = NULL;
 463
 464         if (req->hdr.type >= SNIC_RSP_REPORT_TGTS_CMPL)
 465                 rqi = (struct snic_req_info *) fwreq->hdr.init_ctx;
 466         else
 467                 rqi = (struct snic_req_info *) req->hdr.init_ctx;
 468
 469         SNIC_BUG_ON(rqi == NULL || rqi->req == NULL);
 470         switch (req->hdr.type) {
 471         case SNIC_REQ_REPORT_TGTS:
 472                 cmd_str = "report-tgt : ";
 473                 snprintf(line, LINE_BUFSZ, "SNIC_REQ_REPORT_TGTS :");
 474                 break;
 475
 476         case SNIC_REQ_ICMND:
 477                 cmd_str = "icmnd : ";
 478                 snprintf(line, LINE_BUFSZ, "SNIC_REQ_ICMND : 0x%x :",
 479                          req->u.icmnd.cdb[0]);
 480                 break;
 481
 482         case SNIC_REQ_ITMF:
 483                 cmd_str = "itmf : ";
 484                 snprintf(line, LINE_BUFSZ, "SNIC_REQ_ITMF :");
 485                 break;
 486
 487         case SNIC_REQ_HBA_RESET:
 488                 cmd_str = "hba reset :";
 489                 snprintf(line, LINE_BUFSZ, "SNIC_REQ_HBA_RESET :");
 490                 break;
 491
 492         case SNIC_REQ_EXCH_VER:
 493                 cmd_str = "exch ver : ";
 494                 snprintf(line, LINE_BUFSZ, "SNIC_REQ_EXCH_VER :");
 495                 break;
 496
 497         case SNIC_REQ_TGT_INFO:
 498                 cmd_str = "tgt info : ";
 499                 break;
 500
 501         case SNIC_RSP_REPORT_TGTS_CMPL:
 502                 cmd_str = "report tgt cmpl : ";
 503                 snprintf(line, LINE_BUFSZ, "SNIC_RSP_REPORT_TGTS_CMPL :");
 504                 break;
 505
 506         case SNIC_RSP_ICMND_CMPL:
 507                 cmd_str = "icmnd_cmpl : ";
 508                 snprintf(line, LINE_BUFSZ, "SNIC_RSP_ICMND_CMPL : 0x%x :",
 509                          rqi->req->u.icmnd.cdb[0]);
 510                 break;
 511
 512         case SNIC_RSP_ITMF_CMPL:
 513                 cmd_str = "itmf_cmpl : ";
 514                 snprintf(line, LINE_BUFSZ, "SNIC_RSP_ITMF_CMPL :");
 515                 break;
 516
 517         case SNIC_RSP_HBA_RESET_CMPL:
 518                 cmd_str = "hba_reset_cmpl : ";
 519                 snprintf(line, LINE_BUFSZ, "SNIC_RSP_HBA_RESET_CMPL :");
 520                 break;
 521
 522         case SNIC_RSP_EXCH_VER_CMPL:
 523                 cmd_str = "exch_ver_cmpl : ";
 524                 snprintf(line, LINE_BUFSZ, "SNIC_RSP_EXCH_VER_CMPL :");
 525                 break;
 526
 527         case SNIC_MSG_ACK:
 528                 cmd_str = "msg ack : ";
 529                 snprintf(line, LINE_BUFSZ, "SNIC_MSG_ACK :");
 530                 break;
 531
 532         case SNIC_MSG_ASYNC_EVNOTIFY:
 533                 cmd_str = "async notify : ";
 534                 snprintf(line, LINE_BUFSZ, "SNIC_MSG_ASYNC_EVNOTIFY :");
 535                 break;
 536
 537         default:
 538                 cmd_str = "unknown : ";
 539                 SNIC_BUG_ON(1);
 540                 break;
 541         }
 542
 543         SNIC_INFO("%s:%s >>cmndid=%x:sg_cnt = %x:status = %x:ctx = %lx.\n",
 544                   fn, line, req->hdr.cmnd_id, req->hdr.sg_cnt, req->hdr.status,
 545                   req->hdr.init_ctx);
 546
 547         /* Enable it, to dump byte stream */
 548         if (snic_log_level & 0x20)
 549                 snic_hex_dump(cmd_str, os_buf, len);
 550 } /* end of __snic_print_desc */
 551
 552 void
 553 snic_print_desc(const char *fn, char *os_buf, int len)
 554 {
 555         if (snic_log_level & SNIC_DESC_LOGGING)
 556                 snic_dump_desc(fn, os_buf, len);
 557 }
 558
 559 void
 560 snic_calc_io_process_time(struct snic *snic, struct snic_req_info *rqi)
 561 {
 562         u64 duration;
 563
 564         duration = jiffies - rqi->start_time;
 565
 566         if (duration > atomic64_read(&snic->s_stats.io.max_time))
 567                 atomic64_set(&snic->s_stats.io.max_time, duration);
 568 }