drivers/scsi/bnx2i/bnx2i_iscsi.c

   1 /*
   2  * bnx2i_iscsi.c: Broadcom NetXtreme II iSCSI driver.
   3  *
   4  * Copyright (c) 2006 - 2009 Broadcom Corporation
   5  * Copyright (c) 2007, 2008 Red Hat, Inc.  All rights reserved.
   6  * Copyright (c) 2007, 2008 Mike Christie
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation.
  11  *
  12  * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
  13  */
  14
  15 #include <linux/slab.h>
  16 #include <scsi/scsi_tcq.h>
  17 #include <scsi/libiscsi.h>
  18 #include "bnx2i.h"
  19
  20 struct scsi_transport_template *bnx2i_scsi_xport_template;
  21 struct iscsi_transport bnx2i_iscsi_transport;
  22 static struct scsi_host_template bnx2i_host_template;
  23
  24 /*
  25  * Global endpoint resource info
  26  */
  27 static DEFINE_SPINLOCK(bnx2i_resc_lock); /* protects global resources */
  28
  29
  30 static int bnx2i_adapter_ready(struct bnx2i_hba *hba)
  31 {
  32         int retval = 0;
  33
  34         if (!hba || !test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
  35             test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
  36             test_bit(ADAPTER_STATE_LINK_DOWN, &hba->adapter_state))
  37                 retval = -EPERM;
  38         return retval;
  39 }
  40
  41 /**
  42  * bnx2i_get_write_cmd_bd_idx - identifies various BD bookmarks
  43  * @cmd:                iscsi cmd struct pointer
  44  * @buf_off:            absolute buffer offset
  45  * @start_bd_off:       u32 pointer to return the offset within the BD
  46  *                      indicated by 'start_bd_idx' on which 'buf_off' falls
  47  * @start_bd_idx:       index of the BD on which 'buf_off' falls
  48  *
  49  * identifies & marks various bd info for scsi command's imm data,
  50  * unsolicited data and the first solicited data seq.
  51  */
  52 static void bnx2i_get_write_cmd_bd_idx(struct bnx2i_cmd *cmd, u32 buf_off,
  53                                        u32 *start_bd_off, u32 *start_bd_idx)
  54 {
  55         struct iscsi_bd *bd_tbl = cmd->io_tbl.bd_tbl;
  56         u32 cur_offset = 0;
  57         u32 cur_bd_idx = 0;
  58
  59         if (buf_off) {
  60                 while (buf_off >= (cur_offset + bd_tbl->buffer_length)) {
  61                         cur_offset += bd_tbl->buffer_length;
  62                         cur_bd_idx++;
  63                         bd_tbl++;
  64                 }
  65         }
  66
  67         *start_bd_off = buf_off - cur_offset;
  68         *start_bd_idx = cur_bd_idx;
  69 }
  70
  71 /**
  72  * bnx2i_setup_write_cmd_bd_info - sets up BD various information
  73  * @task:       transport layer's cmd struct pointer
  74  *
  75  * identifies & marks various bd info for scsi command's immediate data,
  76  * unsolicited data and first solicited data seq which includes BD start
  77  * index & BD buf off. his function takes into account iscsi parameter such
  78  * as immediate data and unsolicited data is support on this connection.
  79  */
  80 static void bnx2i_setup_write_cmd_bd_info(struct iscsi_task *task)
  81 {
  82         struct bnx2i_cmd *cmd = task->dd_data;
  83         u32 start_bd_offset;
  84         u32 start_bd_idx;
  85         u32 buffer_offset = 0;
  86         u32 cmd_len = cmd->req.total_data_transfer_length;
  87
  88         /* if ImmediateData is turned off & IntialR2T is turned on,
  89          * there will be no immediate or unsolicited data, just return.
  90          */
  91         if (!iscsi_task_has_unsol_data(task) && !task->imm_count)
  92                 return;
  93
  94         /* Immediate data */
  95         buffer_offset += task->imm_count;
  96         if (task->imm_count == cmd_len)
  97                 return;
  98
  99         if (iscsi_task_has_unsol_data(task)) {
 100                 bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
 101                                            &start_bd_offset, &start_bd_idx);
 102                 cmd->req.ud_buffer_offset = start_bd_offset;
 103                 cmd->req.ud_start_bd_index = start_bd_idx;
 104                 buffer_offset += task->unsol_r2t.data_length;
 105         }
 106
 107         if (buffer_offset != cmd_len) {
 108                 bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
 109                                            &start_bd_offset, &start_bd_idx);
 110                 if ((start_bd_offset > task->conn->session->first_burst) ||
 111                     (start_bd_idx > scsi_sg_count(cmd->scsi_cmd))) {
 112                         int i = 0;
 113
 114                         iscsi_conn_printk(KERN_ALERT, task->conn,
 115                                           "bnx2i- error, buf offset 0x%x "
 116                                           "bd_valid %d use_sg %d\n",
 117                                           buffer_offset, cmd->io_tbl.bd_valid,
 118                                           scsi_sg_count(cmd->scsi_cmd));
 119                         for (i = 0; i < cmd->io_tbl.bd_valid; i++)
 120                                 iscsi_conn_printk(KERN_ALERT, task->conn,
 121                                                   "bnx2i err, bd[%d]: len %x\n",
 122                                                   i, cmd->io_tbl.bd_tbl[i].\
 123                                                   buffer_length);
 124                 }
 125                 cmd->req.sd_buffer_offset = start_bd_offset;
 126                 cmd->req.sd_start_bd_index = start_bd_idx;
 127         }
 128 }
 129
 130
 131
 132 /**
 133  * bnx2i_map_scsi_sg - maps IO buffer and prepares the BD table
 134  * @hba:        adapter instance
 135  * @cmd:        iscsi cmd struct pointer
 136  *
 137  * map SG list
 138  */
 139 static int bnx2i_map_scsi_sg(struct bnx2i_hba *hba, struct bnx2i_cmd *cmd)
 140 {
 141         struct scsi_cmnd *sc = cmd->scsi_cmd;
 142         struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
 143         struct scatterlist *sg;
 144         int byte_count = 0;
 145         int bd_count = 0;
 146         int sg_count;
 147         int sg_len;
 148         u64 addr;
 149         int i;
 150
 151         BUG_ON(scsi_sg_count(sc) > ISCSI_MAX_BDS_PER_CMD);
 152
 153         sg_count = scsi_dma_map(sc);
 154
 155         scsi_for_each_sg(sc, sg, sg_count, i) {
 156                 sg_len = sg_dma_len(sg);
 157                 addr = (u64) sg_dma_address(sg);
 158                 bd[bd_count].buffer_addr_lo = addr & 0xffffffff;
 159                 bd[bd_count].buffer_addr_hi = addr >> 32;
 160                 bd[bd_count].buffer_length = sg_len;
 161                 bd[bd_count].flags = 0;
 162                 if (bd_count == 0)
 163                         bd[bd_count].flags = ISCSI_BD_FIRST_IN_BD_CHAIN;
 164
 165                 byte_count += sg_len;
 166                 bd_count++;
 167         }
 168
 169         if (bd_count)
 170                 bd[bd_count - 1].flags |= ISCSI_BD_LAST_IN_BD_CHAIN;
 171
 172         BUG_ON(byte_count != scsi_bufflen(sc));
 173         return bd_count;
 174 }
 175
 176 /**
 177  * bnx2i_iscsi_map_sg_list - maps SG list
 178  * @cmd:        iscsi cmd struct pointer
 179  *
 180  * creates BD list table for the command
 181  */
 182 static void bnx2i_iscsi_map_sg_list(struct bnx2i_cmd *cmd)
 183 {
 184         int bd_count;
 185
 186         bd_count  = bnx2i_map_scsi_sg(cmd->conn->hba, cmd);
 187         if (!bd_count) {
 188                 struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
 189
 190                 bd[0].buffer_addr_lo = bd[0].buffer_addr_hi = 0;
 191                 bd[0].buffer_length = bd[0].flags = 0;
 192         }
 193         cmd->io_tbl.bd_valid = bd_count;
 194 }
 195
 196
 197 /**
 198  * bnx2i_iscsi_unmap_sg_list - unmaps SG list
 199  * @cmd:        iscsi cmd struct pointer
 200  *
 201  * unmap IO buffers and invalidate the BD table
 202  */
 203 void bnx2i_iscsi_unmap_sg_list(struct bnx2i_cmd *cmd)
 204 {
 205         struct scsi_cmnd *sc = cmd->scsi_cmd;
 206
 207         if (cmd->io_tbl.bd_valid && sc) {
 208                 scsi_dma_unmap(sc);
 209                 cmd->io_tbl.bd_valid = 0;
 210         }
 211 }
 212
 213 static void bnx2i_setup_cmd_wqe_template(struct bnx2i_cmd *cmd)
 214 {
 215         memset(&cmd->req, 0x00, sizeof(cmd->req));
 216         cmd->req.op_code = 0xFF;
 217         cmd->req.bd_list_addr_lo = (u32) cmd->io_tbl.bd_tbl_dma;
 218         cmd->req.bd_list_addr_hi =
 219                 (u32) ((u64) cmd->io_tbl.bd_tbl_dma >> 32);
 220
 221 }
 222
 223
 224 /**
 225  * bnx2i_bind_conn_to_iscsi_cid - bind conn structure to 'iscsi_cid'
 226  * @hba:        pointer to adapter instance
 227  * @conn:       pointer to iscsi connection
 228  * @iscsi_cid:  iscsi context ID, range 0 - (MAX_CONN - 1)
 229  *
 230  * update iscsi cid table entry with connection pointer. This enables
 231  *      driver to quickly get hold of connection structure pointer in
 232  *      completion/interrupt thread using iscsi context ID
 233  */
 234 static int bnx2i_bind_conn_to_iscsi_cid(struct bnx2i_hba *hba,
 235                                         struct bnx2i_conn *bnx2i_conn,
 236                                         u32 iscsi_cid)
 237 {
 238         if (hba && hba->cid_que.conn_cid_tbl[iscsi_cid]) {
 239                 iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
 240                                  "conn bind - entry #%d not free\n", iscsi_cid);
 241                 return -EBUSY;
 242         }
 243
 244         hba->cid_que.conn_cid_tbl[iscsi_cid] = bnx2i_conn;
 245         return 0;
 246 }
 247
 248
 249 /**
 250  * bnx2i_get_conn_from_id - maps an iscsi cid to corresponding conn ptr
 251  * @hba:        pointer to adapter instance
 252  * @iscsi_cid:  iscsi context ID, range 0 - (MAX_CONN - 1)
 253  */
 254 struct bnx2i_conn *bnx2i_get_conn_from_id(struct bnx2i_hba *hba,
 255                                           u16 iscsi_cid)
 256 {
 257         if (!hba->cid_que.conn_cid_tbl) {
 258                 printk(KERN_ERR "bnx2i: ERROR - missing conn<->cid table\n");
 259                 return NULL;
 260
 261         } else if (iscsi_cid >= hba->max_active_conns) {
 262                 printk(KERN_ERR "bnx2i: wrong cid #%d\n", iscsi_cid);
 263                 return NULL;
 264         }
 265         return hba->cid_que.conn_cid_tbl[iscsi_cid];
 266 }
 267
 268
 269 /**
 270  * bnx2i_alloc_iscsi_cid - allocates a iscsi_cid from free pool
 271  * @hba:        pointer to adapter instance
 272  */
 273 static u32 bnx2i_alloc_iscsi_cid(struct bnx2i_hba *hba)
 274 {
 275         int idx;
 276
 277         if (!hba->cid_que.cid_free_cnt)
 278                 return -1;
 279
 280         idx = hba->cid_que.cid_q_cons_idx;
 281         hba->cid_que.cid_q_cons_idx++;
 282         if (hba->cid_que.cid_q_cons_idx == hba->cid_que.cid_q_max_idx)
 283                 hba->cid_que.cid_q_cons_idx = 0;
 284
 285         hba->cid_que.cid_free_cnt--;
 286         return hba->cid_que.cid_que[idx];
 287 }
 288
 289
 290 /**
 291  * bnx2i_free_iscsi_cid - returns tcp port to free list
 292  * @hba:                pointer to adapter instance
 293  * @iscsi_cid:          iscsi context ID to free
 294  */
 295 static void bnx2i_free_iscsi_cid(struct bnx2i_hba *hba, u16 iscsi_cid)
 296 {
 297         int idx;
 298
 299         if (iscsi_cid == (u16) -1)
 300                 return;
 301
 302         hba->cid_que.cid_free_cnt++;
 303
 304         idx = hba->cid_que.cid_q_prod_idx;
 305         hba->cid_que.cid_que[idx] = iscsi_cid;
 306         hba->cid_que.conn_cid_tbl[iscsi_cid] = NULL;
 307         hba->cid_que.cid_q_prod_idx++;
 308         if (hba->cid_que.cid_q_prod_idx == hba->cid_que.cid_q_max_idx)
 309                 hba->cid_que.cid_q_prod_idx = 0;
 310 }
 311
 312
 313 /**
 314  * bnx2i_setup_free_cid_que - sets up free iscsi cid queue
 315  * @hba:        pointer to adapter instance
 316  *
 317  * allocates memory for iscsi cid queue & 'cid - conn ptr' mapping table,
 318  *      and initialize table attributes
 319  */
 320 static int bnx2i_setup_free_cid_que(struct bnx2i_hba *hba)
 321 {
 322         int mem_size;
 323         int i;
 324
 325         mem_size = hba->max_active_conns * sizeof(u32);
 326         mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
 327
 328         hba->cid_que.cid_que_base = kmalloc(mem_size, GFP_KERNEL);
 329         if (!hba->cid_que.cid_que_base)
 330                 return -ENOMEM;
 331
 332         mem_size = hba->max_active_conns * sizeof(struct bnx2i_conn *);
 333         mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
 334         hba->cid_que.conn_cid_tbl = kmalloc(mem_size, GFP_KERNEL);
 335         if (!hba->cid_que.conn_cid_tbl) {
 336                 kfree(hba->cid_que.cid_que_base);
 337                 hba->cid_que.cid_que_base = NULL;
 338                 return -ENOMEM;
 339         }
 340
 341         hba->cid_que.cid_que = (u32 *)hba->cid_que.cid_que_base;
 342         hba->cid_que.cid_q_prod_idx = 0;
 343         hba->cid_que.cid_q_cons_idx = 0;
 344         hba->cid_que.cid_q_max_idx = hba->max_active_conns;
 345         hba->cid_que.cid_free_cnt = hba->max_active_conns;
 346
 347         for (i = 0; i < hba->max_active_conns; i++) {
 348                 hba->cid_que.cid_que[i] = i;
 349                 hba->cid_que.conn_cid_tbl[i] = NULL;
 350         }
 351         return 0;
 352 }
 353
 354
 355 /**
 356  * bnx2i_release_free_cid_que - releases 'iscsi_cid' queue resources
 357  * @hba:        pointer to adapter instance
 358  */
 359 static void bnx2i_release_free_cid_que(struct bnx2i_hba *hba)
 360 {
 361         kfree(hba->cid_que.cid_que_base);
 362         hba->cid_que.cid_que_base = NULL;
 363
 364         kfree(hba->cid_que.conn_cid_tbl);
 365         hba->cid_que.conn_cid_tbl = NULL;
 366 }
 367
 368
 369 /**
 370  * bnx2i_alloc_ep - allocates ep structure from global pool
 371  * @hba:        pointer to adapter instance
 372  *
 373  * routine allocates a free endpoint structure from global pool and
 374  *      a tcp port to be used for this connection.  Global resource lock,
 375  *      'bnx2i_resc_lock' is held while accessing shared global data structures
 376  */
 377 static struct iscsi_endpoint *bnx2i_alloc_ep(struct bnx2i_hba *hba)
 378 {
 379         struct iscsi_endpoint *ep;
 380         struct bnx2i_endpoint *bnx2i_ep;
 381
 382         ep = iscsi_create_endpoint(sizeof(*bnx2i_ep));
 383         if (!ep) {
 384                 printk(KERN_ERR "bnx2i: Could not allocate ep\n");
 385                 return NULL;
 386         }
 387
 388         bnx2i_ep = ep->dd_data;
 389         bnx2i_ep->cls_ep = ep;
 390         INIT_LIST_HEAD(&bnx2i_ep->link);
 391         bnx2i_ep->state = EP_STATE_IDLE;
 392         bnx2i_ep->ep_iscsi_cid = (u16) -1;
 393         bnx2i_ep->hba = hba;
 394         bnx2i_ep->hba_age = hba->age;
 395         hba->ofld_conns_active++;
 396         init_waitqueue_head(&bnx2i_ep->ofld_wait);
 397         return ep;
 398 }
 399
 400
 401 /**
 402  * bnx2i_free_ep - free endpoint
 403  * @ep:         pointer to iscsi endpoint structure
 404  */
 405 static void bnx2i_free_ep(struct iscsi_endpoint *ep)
 406 {
 407         struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
 408         unsigned long flags;
 409
 410         spin_lock_irqsave(&bnx2i_resc_lock, flags);
 411         bnx2i_ep->state = EP_STATE_IDLE;
 412         bnx2i_ep->hba->ofld_conns_active--;
 413
 414         bnx2i_free_iscsi_cid(bnx2i_ep->hba, bnx2i_ep->ep_iscsi_cid);
 415         if (bnx2i_ep->conn) {
 416                 bnx2i_ep->conn->ep = NULL;
 417                 bnx2i_ep->conn = NULL;
 418         }
 419
 420         bnx2i_ep->hba = NULL;
 421         spin_unlock_irqrestore(&bnx2i_resc_lock, flags);
 422         iscsi_destroy_endpoint(ep);
 423 }
 424
 425
 426 /**
 427  * bnx2i_alloc_bdt - allocates buffer descriptor (BD) table for the command
 428  * @hba:        adapter instance pointer
 429  * @session:    iscsi session pointer
 430  * @cmd:        iscsi command structure
 431  */
 432 static int bnx2i_alloc_bdt(struct bnx2i_hba *hba, struct iscsi_session *session,
 433                            struct bnx2i_cmd *cmd)
 434 {
 435         struct io_bdt *io = &cmd->io_tbl;
 436         struct iscsi_bd *bd;
 437
 438         io->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 439                                         ISCSI_MAX_BDS_PER_CMD * sizeof(*bd),
 440                                         &io->bd_tbl_dma, GFP_KERNEL);
 441         if (!io->bd_tbl) {
 442                 iscsi_session_printk(KERN_ERR, session, "Could not "
 443                                      "allocate bdt.\n");
 444                 return -ENOMEM;
 445         }
 446         io->bd_valid = 0;
 447         return 0;
 448 }
 449
 450 /**
 451  * bnx2i_destroy_cmd_pool - destroys iscsi command pool and release BD table
 452  * @hba:        adapter instance pointer
 453  * @session:    iscsi session pointer
 454  * @cmd:        iscsi command structure
 455  */
 456 static void bnx2i_destroy_cmd_pool(struct bnx2i_hba *hba,
 457                                    struct iscsi_session *session)
 458 {
 459         int i;
 460
 461         for (i = 0; i < session->cmds_max; i++) {
 462                 struct iscsi_task *task = session->cmds[i];
 463                 struct bnx2i_cmd *cmd = task->dd_data;
 464
 465                 if (cmd->io_tbl.bd_tbl)
 466                         dma_free_coherent(&hba->pcidev->dev,
 467                                           ISCSI_MAX_BDS_PER_CMD *
 468                                           sizeof(struct iscsi_bd),
 469                                           cmd->io_tbl.bd_tbl,
 470                                           cmd->io_tbl.bd_tbl_dma);
 471         }
 472
 473 }
 474
 475
 476 /**
 477  * bnx2i_setup_cmd_pool - sets up iscsi command pool for the session
 478  * @hba:        adapter instance pointer
 479  * @session:    iscsi session pointer
 480  */
 481 static int bnx2i_setup_cmd_pool(struct bnx2i_hba *hba,
 482                                 struct iscsi_session *session)
 483 {
 484         int i;
 485
 486         for (i = 0; i < session->cmds_max; i++) {
 487                 struct iscsi_task *task = session->cmds[i];
 488                 struct bnx2i_cmd *cmd = task->dd_data;
 489
 490                 task->hdr = &cmd->hdr;
 491                 task->hdr_max = sizeof(struct iscsi_hdr);
 492
 493                 if (bnx2i_alloc_bdt(hba, session, cmd))
 494                         goto free_bdts;
 495         }
 496
 497         return 0;
 498
 499 free_bdts:
 500         bnx2i_destroy_cmd_pool(hba, session);
 501         return -ENOMEM;
 502 }
 503
 504
 505 /**
 506  * bnx2i_setup_mp_bdt - allocate BD table resources
 507  * @hba:        pointer to adapter structure
 508  *
 509  * Allocate memory for dummy buffer and associated BD
 510  * table to be used by middle path (MP) requests
 511  */
 512 static int bnx2i_setup_mp_bdt(struct bnx2i_hba *hba)
 513 {
 514         int rc = 0;
 515         struct iscsi_bd *mp_bdt;
 516         u64 addr;
 517
 518         hba->mp_bd_tbl = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 519                                             &hba->mp_bd_dma, GFP_KERNEL);
 520         if (!hba->mp_bd_tbl) {
 521                 printk(KERN_ERR "unable to allocate Middle Path BDT\n");
 522                 rc = -1;
 523                 goto out;
 524         }
 525
 526         hba->dummy_buffer = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 527                                                &hba->dummy_buf_dma, GFP_KERNEL);
 528         if (!hba->dummy_buffer) {
 529                 printk(KERN_ERR "unable to alloc Middle Path Dummy Buffer\n");
 530                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 531                                   hba->mp_bd_tbl, hba->mp_bd_dma);
 532                 hba->mp_bd_tbl = NULL;
 533                 rc = -1;
 534                 goto out;
 535         }
 536
 537         mp_bdt = (struct iscsi_bd *) hba->mp_bd_tbl;
 538         addr = (unsigned long) hba->dummy_buf_dma;
 539         mp_bdt->buffer_addr_lo = addr & 0xffffffff;
 540         mp_bdt->buffer_addr_hi = addr >> 32;
 541         mp_bdt->buffer_length = PAGE_SIZE;
 542         mp_bdt->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
 543                         ISCSI_BD_FIRST_IN_BD_CHAIN;
 544 out:
 545         return rc;
 546 }
 547
 548
 549 /**
 550  * bnx2i_free_mp_bdt - releases ITT back to free pool
 551  * @hba:        pointer to adapter instance
 552  *
 553  * free MP dummy buffer and associated BD table
 554  */
 555 static void bnx2i_free_mp_bdt(struct bnx2i_hba *hba)
 556 {
 557         if (hba->mp_bd_tbl) {
 558                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 559                                   hba->mp_bd_tbl, hba->mp_bd_dma);
 560                 hba->mp_bd_tbl = NULL;
 561         }
 562         if (hba->dummy_buffer) {
 563                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 564                                   hba->dummy_buffer, hba->dummy_buf_dma);
 565                 hba->dummy_buffer = NULL;
 566         }
 567                 return;
 568 }
 569
 570 /**
 571  * bnx2i_drop_session - notifies iscsid of connection error.
 572  * @hba:        adapter instance pointer
 573  * @session:    iscsi session pointer
 574  *
 575  * This notifies iscsid that there is a error, so it can initiate
 576  * recovery.
 577  *
 578  * This relies on caller using the iscsi class iterator so the object
 579  * is refcounted and does not disapper from under us.
 580  */
 581 void bnx2i_drop_session(struct iscsi_cls_session *cls_session)
 582 {
 583         iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
 584 }
 585
 586 /**
 587  * bnx2i_ep_destroy_list_add - add an entry to EP destroy list
 588  * @hba:        pointer to adapter instance
 589  * @ep:         pointer to endpoint (transport indentifier) structure
 590  *
 591  * EP destroy queue manager
 592  */
 593 static int bnx2i_ep_destroy_list_add(struct bnx2i_hba *hba,
 594                                      struct bnx2i_endpoint *ep)
 595 {
 596         write_lock_bh(&hba->ep_rdwr_lock);
 597         list_add_tail(&ep->link, &hba->ep_destroy_list);
 598         write_unlock_bh(&hba->ep_rdwr_lock);
 599         return 0;
 600 }
 601
 602 /**
 603  * bnx2i_ep_destroy_list_del - add an entry to EP destroy list
 604  *
 605  * @hba:                pointer to adapter instance
 606  * @ep:                 pointer to endpoint (transport indentifier) structure
 607  *
 608  * EP destroy queue manager
 609  */
 610 static int bnx2i_ep_destroy_list_del(struct bnx2i_hba *hba,
 611                                      struct bnx2i_endpoint *ep)
 612 {
 613         write_lock_bh(&hba->ep_rdwr_lock);
 614         list_del_init(&ep->link);
 615         write_unlock_bh(&hba->ep_rdwr_lock);
 616
 617         return 0;
 618 }
 619
 620 /**
 621  * bnx2i_ep_ofld_list_add - add an entry to ep offload pending list
 622  * @hba:        pointer to adapter instance
 623  * @ep:         pointer to endpoint (transport indentifier) structure
 624  *
 625  * pending conn offload completion queue manager
 626  */
 627 static int bnx2i_ep_ofld_list_add(struct bnx2i_hba *hba,
 628                                   struct bnx2i_endpoint *ep)
 629 {
 630         write_lock_bh(&hba->ep_rdwr_lock);
 631         list_add_tail(&ep->link, &hba->ep_ofld_list);
 632         write_unlock_bh(&hba->ep_rdwr_lock);
 633         return 0;
 634 }
 635
 636 /**
 637  * bnx2i_ep_ofld_list_del - add an entry to ep offload pending list
 638  * @hba:                pointer to adapter instance
 639  * @ep:                 pointer to endpoint (transport indentifier) structure
 640  *
 641  * pending conn offload completion queue manager
 642  */
 643 static int bnx2i_ep_ofld_list_del(struct bnx2i_hba *hba,
 644                                   struct bnx2i_endpoint *ep)
 645 {
 646         write_lock_bh(&hba->ep_rdwr_lock);
 647         list_del_init(&ep->link);
 648         write_unlock_bh(&hba->ep_rdwr_lock);
 649         return 0;
 650 }
 651
 652
 653 /**
 654  * bnx2i_find_ep_in_ofld_list - find iscsi_cid in pending list of endpoints
 655  *
 656  * @hba:                pointer to adapter instance
 657  * @iscsi_cid:          iscsi context ID to find
 658  *
 659  */
 660 struct bnx2i_endpoint *
 661 bnx2i_find_ep_in_ofld_list(struct bnx2i_hba *hba, u32 iscsi_cid)
 662 {
 663         struct list_head *list;
 664         struct list_head *tmp;
 665         struct bnx2i_endpoint *ep;
 666
 667         read_lock_bh(&hba->ep_rdwr_lock);
 668         list_for_each_safe(list, tmp, &hba->ep_ofld_list) {
 669                 ep = (struct bnx2i_endpoint *)list;
 670
 671                 if (ep->ep_iscsi_cid == iscsi_cid)
 672                         break;
 673                 ep = NULL;
 674         }
 675         read_unlock_bh(&hba->ep_rdwr_lock);
 676
 677         if (!ep)
 678                 printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
 679         return ep;
 680 }
 681
 682 /**
 683  * bnx2i_find_ep_in_destroy_list - find iscsi_cid in destroy list
 684  * @hba:                pointer to adapter instance
 685  * @iscsi_cid:          iscsi context ID to find
 686  *
 687  */
 688 struct bnx2i_endpoint *
 689 bnx2i_find_ep_in_destroy_list(struct bnx2i_hba *hba, u32 iscsi_cid)
 690 {
 691         struct list_head *list;
 692         struct list_head *tmp;
 693         struct bnx2i_endpoint *ep;
 694
 695         read_lock_bh(&hba->ep_rdwr_lock);
 696         list_for_each_safe(list, tmp, &hba->ep_destroy_list) {
 697                 ep = (struct bnx2i_endpoint *)list;
 698
 699                 if (ep->ep_iscsi_cid == iscsi_cid)
 700                         break;
 701                 ep = NULL;
 702         }
 703         read_unlock_bh(&hba->ep_rdwr_lock);
 704
 705         if (!ep)
 706                 printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
 707
 708         return ep;
 709 }
 710
 711 /**
 712  * bnx2i_ep_active_list_add - add an entry to ep active list
 713  * @hba:        pointer to adapter instance
 714  * @ep:         pointer to endpoint (transport indentifier) structure
 715  *
 716  * current active conn queue manager
 717  */
 718 static void bnx2i_ep_active_list_add(struct bnx2i_hba *hba,
 719                                      struct bnx2i_endpoint *ep)
 720 {
 721         write_lock_bh(&hba->ep_rdwr_lock);
 722         list_add_tail(&ep->link, &hba->ep_active_list);
 723         write_unlock_bh(&hba->ep_rdwr_lock);
 724 }
 725
 726
 727 /**
 728  * bnx2i_ep_active_list_del - deletes an entry to ep active list
 729  * @hba:        pointer to adapter instance
 730  * @ep:         pointer to endpoint (transport indentifier) structure
 731  *
 732  * current active conn queue manager
 733  */
 734 static void bnx2i_ep_active_list_del(struct bnx2i_hba *hba,
 735                                      struct bnx2i_endpoint *ep)
 736 {
 737         write_lock_bh(&hba->ep_rdwr_lock);
 738         list_del_init(&ep->link);
 739         write_unlock_bh(&hba->ep_rdwr_lock);
 740 }
 741
 742
 743 /**
 744  * bnx2i_setup_host_queue_size - assigns shost->can_queue param
 745  * @hba:        pointer to adapter instance
 746  * @shost:      scsi host pointer
 747  *
 748  * Initializes 'can_queue' parameter based on how many outstanding commands
 749  *      the device can handle. Each device 5708/5709/57710 has different
 750  *      capabilities
 751  */
 752 static void bnx2i_setup_host_queue_size(struct bnx2i_hba *hba,
 753                                         struct Scsi_Host *shost)
 754 {
 755         if (test_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type))
 756                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
 757         else if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type))
 758                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5709;
 759         else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
 760                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_57710;
 761         else
 762                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
 763 }
 764
 765
 766 /**
 767  * bnx2i_alloc_hba - allocate and init adapter instance
 768  * @cnic:       cnic device pointer
 769  *
 770  * allocate & initialize adapter structure and call other
 771  *      support routines to do per adapter initialization
 772  */
 773 struct bnx2i_hba *bnx2i_alloc_hba(struct cnic_dev *cnic)
 774 {
 775         struct Scsi_Host *shost;
 776         struct bnx2i_hba *hba;
 777
 778         shost = iscsi_host_alloc(&bnx2i_host_template, sizeof(*hba), 0);
 779         if (!shost)
 780                 return NULL;
 781         shost->dma_boundary = cnic->pcidev->dma_mask;
 782         shost->transportt = bnx2i_scsi_xport_template;
 783         shost->max_id = ISCSI_MAX_CONNS_PER_HBA;
 784         shost->max_channel = 0;
 785         shost->max_lun = 512;
 786         shost->max_cmd_len = 16;
 787
 788         hba = iscsi_host_priv(shost);
 789         hba->shost = shost;
 790         hba->netdev = cnic->netdev;
 791         /* Get PCI related information and update hba struct members */
 792         hba->pcidev = cnic->pcidev;
 793         pci_dev_get(hba->pcidev);
 794         hba->pci_did = hba->pcidev->device;
 795         hba->pci_vid = hba->pcidev->vendor;
 796         hba->pci_sdid = hba->pcidev->subsystem_device;
 797         hba->pci_svid = hba->pcidev->subsystem_vendor;
 798         hba->pci_func = PCI_FUNC(hba->pcidev->devfn);
 799         hba->pci_devno = PCI_SLOT(hba->pcidev->devfn);
 800
 801         bnx2i_identify_device(hba);
 802         bnx2i_setup_host_queue_size(hba, shost);
 803
 804         if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type)) {
 805                 hba->regview = ioremap_nocache(hba->netdev->base_addr,
 806                                                BNX2_MQ_CONFIG2);
 807                 if (!hba->regview)
 808                         goto ioreg_map_err;
 809         } else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
 810                 hba->regview = ioremap_nocache(hba->netdev->base_addr, 4096);
 811                 if (!hba->regview)
 812                         goto ioreg_map_err;
 813         }
 814
 815         if (bnx2i_setup_mp_bdt(hba))
 816                 goto mp_bdt_mem_err;
 817
 818         INIT_LIST_HEAD(&hba->ep_ofld_list);
 819         INIT_LIST_HEAD(&hba->ep_active_list);
 820         INIT_LIST_HEAD(&hba->ep_destroy_list);
 821         rwlock_init(&hba->ep_rdwr_lock);
 822
 823         hba->mtu_supported = BNX2I_MAX_MTU_SUPPORTED;
 824
 825         /* different values for 5708/5709/57710 */
 826         hba->max_active_conns = ISCSI_MAX_CONNS_PER_HBA;
 827
 828         if (bnx2i_setup_free_cid_que(hba))
 829                 goto cid_que_err;
 830
 831         /* SQ/RQ/CQ size can be changed via sysfx interface */
 832         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
 833                 if (sq_size && sq_size <= BNX2I_5770X_SQ_WQES_MAX)
 834                         hba->max_sqes = sq_size;
 835                 else
 836                         hba->max_sqes = BNX2I_5770X_SQ_WQES_DEFAULT;
 837         } else {        /* 5706/5708/5709 */
 838                 if (sq_size && sq_size <= BNX2I_570X_SQ_WQES_MAX)
 839                         hba->max_sqes = sq_size;
 840                 else
 841                         hba->max_sqes = BNX2I_570X_SQ_WQES_DEFAULT;
 842         }
 843
 844         hba->max_rqes = rq_size;
 845         hba->max_cqes = hba->max_sqes + rq_size;
 846         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
 847                 if (hba->max_cqes > BNX2I_5770X_CQ_WQES_MAX)
 848                         hba->max_cqes = BNX2I_5770X_CQ_WQES_MAX;
 849         } else if (hba->max_cqes > BNX2I_570X_CQ_WQES_MAX)
 850                 hba->max_cqes = BNX2I_570X_CQ_WQES_MAX;
 851
 852         hba->num_ccell = hba->max_sqes / 2;
 853
 854         spin_lock_init(&hba->lock);
 855         mutex_init(&hba->net_dev_lock);
 856         init_waitqueue_head(&hba->eh_wait);
 857         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
 858                 hba->hba_shutdown_tmo = 20 * HZ;
 859                 hba->conn_teardown_tmo = 20 * HZ;
 860                 hba->conn_ctx_destroy_tmo = 6 * HZ;
 861         } else {        /* 5706/5708/5709 */
 862                 hba->hba_shutdown_tmo = 20 * HZ;
 863                 hba->conn_teardown_tmo = 10 * HZ;
 864                 hba->conn_ctx_destroy_tmo = 2 * HZ;
 865         }
 866
 867         if (iscsi_host_add(shost, &hba->pcidev->dev))
 868                 goto free_dump_mem;
 869         return hba;
 870
 871 free_dump_mem:
 872         bnx2i_release_free_cid_que(hba);
 873 cid_que_err:
 874         bnx2i_free_mp_bdt(hba);
 875 mp_bdt_mem_err:
 876         if (hba->regview) {
 877                 iounmap(hba->regview);
 878                 hba->regview = NULL;
 879         }
 880 ioreg_map_err:
 881         pci_dev_put(hba->pcidev);
 882         scsi_host_put(shost);
 883         return NULL;
 884 }
 885
 886 /**
 887  * bnx2i_free_hba- releases hba structure and resources held by the adapter
 888  * @hba:        pointer to adapter instance
 889  *
 890  * free adapter structure and call various cleanup routines.
 891  */
 892 void bnx2i_free_hba(struct bnx2i_hba *hba)
 893 {
 894         struct Scsi_Host *shost = hba->shost;
 895
 896         iscsi_host_remove(shost);
 897         INIT_LIST_HEAD(&hba->ep_ofld_list);
 898         INIT_LIST_HEAD(&hba->ep_active_list);
 899         INIT_LIST_HEAD(&hba->ep_destroy_list);
 900         pci_dev_put(hba->pcidev);
 901
 902         if (hba->regview) {
 903                 iounmap(hba->regview);
 904                 hba->regview = NULL;
 905         }
 906         bnx2i_free_mp_bdt(hba);
 907         bnx2i_release_free_cid_que(hba);
 908         iscsi_host_free(shost);
 909 }
 910
 911 /**
 912  * bnx2i_conn_free_login_resources - free DMA resources used for login process
 913  * @hba:                pointer to adapter instance
 914  * @bnx2i_conn:         iscsi connection pointer
 915  *
 916  * Login related resources, mostly BDT & payload DMA memory is freed
 917  */
 918 static void bnx2i_conn_free_login_resources(struct bnx2i_hba *hba,
 919                                             struct bnx2i_conn *bnx2i_conn)
 920 {
 921         if (bnx2i_conn->gen_pdu.resp_bd_tbl) {
 922                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 923                                   bnx2i_conn->gen_pdu.resp_bd_tbl,
 924                                   bnx2i_conn->gen_pdu.resp_bd_dma);
 925                 bnx2i_conn->gen_pdu.resp_bd_tbl = NULL;
 926         }
 927
 928         if (bnx2i_conn->gen_pdu.req_bd_tbl) {
 929                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 930                                   bnx2i_conn->gen_pdu.req_bd_tbl,
 931                                   bnx2i_conn->gen_pdu.req_bd_dma);
 932                 bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
 933         }
 934
 935         if (bnx2i_conn->gen_pdu.resp_buf) {
 936                 dma_free_coherent(&hba->pcidev->dev,
 937                                   ISCSI_DEF_MAX_RECV_SEG_LEN,
 938                                   bnx2i_conn->gen_pdu.resp_buf,
 939                                   bnx2i_conn->gen_pdu.resp_dma_addr);
 940                 bnx2i_conn->gen_pdu.resp_buf = NULL;
 941         }
 942
 943         if (bnx2i_conn->gen_pdu.req_buf) {
 944                 dma_free_coherent(&hba->pcidev->dev,
 945                                   ISCSI_DEF_MAX_RECV_SEG_LEN,
 946                                   bnx2i_conn->gen_pdu.req_buf,
 947                                   bnx2i_conn->gen_pdu.req_dma_addr);
 948                 bnx2i_conn->gen_pdu.req_buf = NULL;
 949         }
 950 }
 951
 952 /**
 953  * bnx2i_conn_alloc_login_resources - alloc DMA resources for login/nop.
 954  * @hba:                pointer to adapter instance
 955  * @bnx2i_conn:         iscsi connection pointer
 956  *
 957  * Mgmt task DNA resources are allocated in this routine.
 958  */
 959 static int bnx2i_conn_alloc_login_resources(struct bnx2i_hba *hba,
 960                                             struct bnx2i_conn *bnx2i_conn)
 961 {
 962         /* Allocate memory for login request/response buffers */
 963         bnx2i_conn->gen_pdu.req_buf =
 964                 dma_alloc_coherent(&hba->pcidev->dev,
 965                                    ISCSI_DEF_MAX_RECV_SEG_LEN,
 966                                    &bnx2i_conn->gen_pdu.req_dma_addr,
 967                                    GFP_KERNEL);
 968         if (bnx2i_conn->gen_pdu.req_buf == NULL)
 969                 goto login_req_buf_failure;
 970
 971         bnx2i_conn->gen_pdu.req_buf_size = 0;
 972         bnx2i_conn->gen_pdu.req_wr_ptr = bnx2i_conn->gen_pdu.req_buf;
 973
 974         bnx2i_conn->gen_pdu.resp_buf =
 975                 dma_alloc_coherent(&hba->pcidev->dev,
 976                                    ISCSI_DEF_MAX_RECV_SEG_LEN,
 977                                    &bnx2i_conn->gen_pdu.resp_dma_addr,
 978                                    GFP_KERNEL);
 979         if (bnx2i_conn->gen_pdu.resp_buf == NULL)
 980                 goto login_resp_buf_failure;
 981
 982         bnx2i_conn->gen_pdu.resp_buf_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
 983         bnx2i_conn->gen_pdu.resp_wr_ptr = bnx2i_conn->gen_pdu.resp_buf;
 984
 985         bnx2i_conn->gen_pdu.req_bd_tbl =
 986                 dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 987                                    &bnx2i_conn->gen_pdu.req_bd_dma, GFP_KERNEL);
 988         if (bnx2i_conn->gen_pdu.req_bd_tbl == NULL)
 989                 goto login_req_bd_tbl_failure;
 990
 991         bnx2i_conn->gen_pdu.resp_bd_tbl =
 992                 dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 993                                    &bnx2i_conn->gen_pdu.resp_bd_dma,
 994                                    GFP_KERNEL);
 995         if (bnx2i_conn->gen_pdu.resp_bd_tbl == NULL)
 996                 goto login_resp_bd_tbl_failure;
 997
 998         return 0;
 999
1000 login_resp_bd_tbl_failure:
1001         dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
1002                           bnx2i_conn->gen_pdu.req_bd_tbl,
1003                           bnx2i_conn->gen_pdu.req_bd_dma);
1004         bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
1005
1006 login_req_bd_tbl_failure:
1007         dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
1008                           bnx2i_conn->gen_pdu.resp_buf,
1009                           bnx2i_conn->gen_pdu.resp_dma_addr);
1010         bnx2i_conn->gen_pdu.resp_buf = NULL;
1011 login_resp_buf_failure:
1012         dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
1013                           bnx2i_conn->gen_pdu.req_buf,
1014                           bnx2i_conn->gen_pdu.req_dma_addr);
1015         bnx2i_conn->gen_pdu.req_buf = NULL;
1016 login_req_buf_failure:
1017         iscsi_conn_printk(KERN_ERR, bnx2i_conn->cls_conn->dd_data,
1018                           "login resource alloc failed!!\n");
1019         return -ENOMEM;
1020
1021 }
1022
1023
1024 /**
1025  * bnx2i_iscsi_prep_generic_pdu_bd - prepares BD table.
1026  * @bnx2i_conn:         iscsi connection pointer
1027  *
1028  * Allocates buffers and BD tables before shipping requests to cnic
1029  *      for PDUs prepared by 'iscsid' daemon
1030  */
1031 static void bnx2i_iscsi_prep_generic_pdu_bd(struct bnx2i_conn *bnx2i_conn)
1032 {
1033         struct iscsi_bd *bd_tbl;
1034
1035         bd_tbl = (struct iscsi_bd *) bnx2i_conn->gen_pdu.req_bd_tbl;
1036
1037         bd_tbl->buffer_addr_hi =
1038                 (u32) ((u64) bnx2i_conn->gen_pdu.req_dma_addr >> 32);
1039         bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.req_dma_addr;
1040         bd_tbl->buffer_length = bnx2i_conn->gen_pdu.req_wr_ptr -
1041                                 bnx2i_conn->gen_pdu.req_buf;
1042         bd_tbl->reserved0 = 0;
1043         bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
1044                         ISCSI_BD_FIRST_IN_BD_CHAIN;
1045
1046         bd_tbl = (struct iscsi_bd  *) bnx2i_conn->gen_pdu.resp_bd_tbl;
1047         bd_tbl->buffer_addr_hi = (u64) bnx2i_conn->gen_pdu.resp_dma_addr >> 32;
1048         bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.resp_dma_addr;
1049         bd_tbl->buffer_length = ISCSI_DEF_MAX_RECV_SEG_LEN;
1050         bd_tbl->reserved0 = 0;
1051         bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
1052                         ISCSI_BD_FIRST_IN_BD_CHAIN;
1053 }
1054
1055
1056 /**
1057  * bnx2i_iscsi_send_generic_request - called to send mgmt tasks.
1058  * @task:       transport layer task pointer
1059  *
1060  * called to transmit PDUs prepared by the 'iscsid' daemon. iSCSI login,
1061  *      Nop-out and Logout requests flow through this path.
1062  */
1063 static int bnx2i_iscsi_send_generic_request(struct iscsi_task *task)
1064 {
1065         struct bnx2i_cmd *cmd = task->dd_data;
1066         struct bnx2i_conn *bnx2i_conn = cmd->conn;
1067         int rc = 0;
1068         char *buf;
1069         int data_len;
1070
1071         bnx2i_iscsi_prep_generic_pdu_bd(bnx2i_conn);
1072         switch (task->hdr->opcode & ISCSI_OPCODE_MASK) {
1073         case ISCSI_OP_LOGIN:
1074                 bnx2i_send_iscsi_login(bnx2i_conn, task);
1075                 break;
1076         case ISCSI_OP_NOOP_OUT:
1077                 data_len = bnx2i_conn->gen_pdu.req_buf_size;
1078                 buf = bnx2i_conn->gen_pdu.req_buf;
1079                 if (data_len)
1080                         rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
1081                                                      buf, data_len, 1);
1082                 else
1083                         rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
1084                                                      NULL, 0, 1);
1085                 break;
1086         case ISCSI_OP_LOGOUT:
1087                 rc = bnx2i_send_iscsi_logout(bnx2i_conn, task);
1088                 break;
1089         case ISCSI_OP_SCSI_TMFUNC:
1090                 rc = bnx2i_send_iscsi_tmf(bnx2i_conn, task);
1091                 break;
1092         default:
1093                 iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
1094                                   "send_gen: unsupported op 0x%x\n",
1095                                   task->hdr->opcode);
1096         }
1097         return rc;
1098 }
1099
1100
1101 /**********************************************************************
1102  *              SCSI-ML Interface
1103  **********************************************************************/
1104
1105 /**
1106  * bnx2i_cpy_scsi_cdb - copies LUN & CDB fields in required format to sq wqe
1107  * @sc:         SCSI-ML command pointer
1108  * @cmd:        iscsi cmd pointer
1109  */
1110 static void bnx2i_cpy_scsi_cdb(struct scsi_cmnd *sc, struct bnx2i_cmd *cmd)
1111 {
1112         u32 dword;
1113         int lpcnt;
1114         u8 *srcp;
1115         u32 *dstp;
1116         u32 scsi_lun[2];
1117
1118         int_to_scsilun(sc->device->lun, (struct scsi_lun *) scsi_lun);
1119         cmd->req.lun[0] = be32_to_cpu(scsi_lun[0]);
1120         cmd->req.lun[1] = be32_to_cpu(scsi_lun[1]);
1121
1122         lpcnt = cmd->scsi_cmd->cmd_len / sizeof(dword);
1123         srcp = (u8 *) sc->cmnd;
1124         dstp = (u32 *) cmd->req.cdb;
1125         while (lpcnt--) {
1126                 memcpy(&dword, (const void *) srcp, 4);
1127                 *dstp = cpu_to_be32(dword);
1128                 srcp += 4;
1129                 dstp++;
1130         }
1131         if (sc->cmd_len & 0x3) {
1132                 dword = (u32) srcp[0] | ((u32) srcp[1] << 8);
1133                 *dstp = cpu_to_be32(dword);
1134         }
1135 }
1136
1137 static void bnx2i_cleanup_task(struct iscsi_task *task)
1138 {
1139         struct iscsi_conn *conn = task->conn;
1140         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1141         struct bnx2i_hba *hba = bnx2i_conn->hba;
1142
1143         /*
1144          * mgmt task or cmd was never sent to us to transmit.
1145          */
1146         if (!task->sc || task->state == ISCSI_TASK_PENDING)
1147                 return;
1148         /*
1149          * need to clean-up task context to claim dma buffers
1150          */
1151         if (task->state == ISCSI_TASK_ABRT_TMF) {
1152                 bnx2i_send_cmd_cleanup_req(hba, task->dd_data);
1153
1154                 spin_unlock_bh(&conn->session->lock);
1155                 wait_for_completion_timeout(&bnx2i_conn->cmd_cleanup_cmpl,
1156                                 msecs_to_jiffies(ISCSI_CMD_CLEANUP_TIMEOUT));
1157                 spin_lock_bh(&conn->session->lock);
1158         }
1159         bnx2i_iscsi_unmap_sg_list(task->dd_data);
1160 }
1161
1162 /**
1163  * bnx2i_mtask_xmit - transmit mtask to chip for further processing
1164  * @conn:       transport layer conn structure pointer
1165  * @task:       transport layer command structure pointer
1166  */
1167 static int
1168 bnx2i_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
1169 {
1170         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1171         struct bnx2i_cmd *cmd = task->dd_data;
1172
1173         memset(bnx2i_conn->gen_pdu.req_buf, 0, ISCSI_DEF_MAX_RECV_SEG_LEN);
1174
1175         bnx2i_setup_cmd_wqe_template(cmd);
1176         bnx2i_conn->gen_pdu.req_buf_size = task->data_count;
1177         if (task->data_count) {
1178                 memcpy(bnx2i_conn->gen_pdu.req_buf, task->data,
1179                        task->data_count);
1180                 bnx2i_conn->gen_pdu.req_wr_ptr =
1181                         bnx2i_conn->gen_pdu.req_buf + task->data_count;
1182         }
1183         cmd->conn = conn->dd_data;
1184         cmd->scsi_cmd = NULL;
1185         return bnx2i_iscsi_send_generic_request(task);
1186 }
1187
1188 /**
1189  * bnx2i_task_xmit - transmit iscsi command to chip for further processing
1190  * @task:       transport layer command structure pointer
1191  *
1192  * maps SG buffers and send request to chip/firmware in the form of SQ WQE
1193  */
1194 static int bnx2i_task_xmit(struct iscsi_task *task)
1195 {
1196         struct iscsi_conn *conn = task->conn;
1197         struct iscsi_session *session = conn->session;
1198         struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
1199         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1200         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1201         struct scsi_cmnd *sc = task->sc;
1202         struct bnx2i_cmd *cmd = task->dd_data;
1203         struct iscsi_cmd *hdr = (struct iscsi_cmd *) task->hdr;
1204
1205         /*
1206          * If there is no scsi_cmnd this must be a mgmt task
1207          */
1208         if (!sc)
1209                 return bnx2i_mtask_xmit(conn, task);
1210
1211         bnx2i_setup_cmd_wqe_template(cmd);
1212         cmd->req.op_code = ISCSI_OP_SCSI_CMD;
1213         cmd->conn = bnx2i_conn;
1214         cmd->scsi_cmd = sc;
1215         cmd->req.total_data_transfer_length = scsi_bufflen(sc);
1216         cmd->req.cmd_sn = be32_to_cpu(hdr->cmdsn);
1217
1218         bnx2i_iscsi_map_sg_list(cmd);
1219         bnx2i_cpy_scsi_cdb(sc, cmd);
1220
1221         cmd->req.op_attr = ISCSI_ATTR_SIMPLE;
1222         if (sc->sc_data_direction == DMA_TO_DEVICE) {
1223                 cmd->req.op_attr |= ISCSI_CMD_REQUEST_WRITE;
1224                 cmd->req.itt = task->itt |
1225                         (ISCSI_TASK_TYPE_WRITE << ISCSI_CMD_REQUEST_TYPE_SHIFT);
1226                 bnx2i_setup_write_cmd_bd_info(task);
1227         } else {
1228                 if (scsi_bufflen(sc))
1229                         cmd->req.op_attr |= ISCSI_CMD_REQUEST_READ;
1230                 cmd->req.itt = task->itt |
1231                         (ISCSI_TASK_TYPE_READ << ISCSI_CMD_REQUEST_TYPE_SHIFT);
1232         }
1233
1234         cmd->req.num_bds = cmd->io_tbl.bd_valid;
1235         if (!cmd->io_tbl.bd_valid) {
1236                 cmd->req.bd_list_addr_lo = (u32) hba->mp_bd_dma;
1237                 cmd->req.bd_list_addr_hi = (u32) ((u64) hba->mp_bd_dma >> 32);
1238                 cmd->req.num_bds = 1;
1239         }
1240
1241         bnx2i_send_iscsi_scsicmd(bnx2i_conn, cmd);
1242         return 0;
1243 }
1244
1245 /**
1246  * bnx2i_session_create - create a new iscsi session
1247  * @cmds_max:           max commands supported
1248  * @qdepth:             scsi queue depth to support
1249  * @initial_cmdsn:      initial iscsi CMDSN to be used for this session
1250  *
1251  * Creates a new iSCSI session instance on given device.
1252  */
1253 static struct iscsi_cls_session *
1254 bnx2i_session_create(struct iscsi_endpoint *ep,
1255                      uint16_t cmds_max, uint16_t qdepth,
1256                      uint32_t initial_cmdsn)
1257 {
1258         struct Scsi_Host *shost;
1259         struct iscsi_cls_session *cls_session;
1260         struct bnx2i_hba *hba;
1261         struct bnx2i_endpoint *bnx2i_ep;
1262
1263         if (!ep) {
1264                 printk(KERN_ERR "bnx2i: missing ep.\n");
1265                 return NULL;
1266         }
1267
1268         bnx2i_ep = ep->dd_data;
1269         shost = bnx2i_ep->hba->shost;
1270         hba = iscsi_host_priv(shost);
1271         if (bnx2i_adapter_ready(hba))
1272                 return NULL;
1273
1274         /*
1275          * user can override hw limit as long as it is within
1276          * the min/max.
1277          */
1278         if (cmds_max > hba->max_sqes)
1279                 cmds_max = hba->max_sqes;
1280         else if (cmds_max < BNX2I_SQ_WQES_MIN)
1281                 cmds_max = BNX2I_SQ_WQES_MIN;
1282
1283         cls_session = iscsi_session_setup(&bnx2i_iscsi_transport, shost,
1284                                           cmds_max, 0, sizeof(struct bnx2i_cmd),
1285                                           initial_cmdsn, ISCSI_MAX_TARGET);
1286         if (!cls_session)
1287                 return NULL;
1288
1289         if (bnx2i_setup_cmd_pool(hba, cls_session->dd_data))
1290                 goto session_teardown;
1291         return cls_session;
1292
1293 session_teardown:
1294         iscsi_session_teardown(cls_session);
1295         return NULL;
1296 }
1297
1298
1299 /**
1300  * bnx2i_session_destroy - destroys iscsi session
1301  * @cls_session:        pointer to iscsi cls session
1302  *
1303  * Destroys previously created iSCSI session instance and releases
1304  *      all resources held by it
1305  */
1306 static void bnx2i_session_destroy(struct iscsi_cls_session *cls_session)
1307 {
1308         struct iscsi_session *session = cls_session->dd_data;
1309         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1310         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1311
1312         bnx2i_destroy_cmd_pool(hba, session);
1313         iscsi_session_teardown(cls_session);
1314 }
1315
1316
1317 /**
1318  * bnx2i_conn_create - create iscsi connection instance
1319  * @cls_session:        pointer to iscsi cls session
1320  * @cid:                iscsi cid as per rfc (not NX2's CID terminology)
1321  *
1322  * Creates a new iSCSI connection instance for a given session
1323  */
1324 static struct iscsi_cls_conn *
1325 bnx2i_conn_create(struct iscsi_cls_session *cls_session, uint32_t cid)
1326 {
1327         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1328         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1329         struct bnx2i_conn *bnx2i_conn;
1330         struct iscsi_cls_conn *cls_conn;
1331         struct iscsi_conn *conn;
1332
1333         cls_conn = iscsi_conn_setup(cls_session, sizeof(*bnx2i_conn),
1334                                     cid);
1335         if (!cls_conn)
1336                 return NULL;
1337         conn = cls_conn->dd_data;
1338
1339         bnx2i_conn = conn->dd_data;
1340         bnx2i_conn->cls_conn = cls_conn;
1341         bnx2i_conn->hba = hba;
1342         /* 'ep' ptr will be assigned in bind() call */
1343         bnx2i_conn->ep = NULL;
1344         init_completion(&bnx2i_conn->cmd_cleanup_cmpl);
1345
1346         if (bnx2i_conn_alloc_login_resources(hba, bnx2i_conn)) {
1347                 iscsi_conn_printk(KERN_ALERT, conn,
1348                                   "conn_new: login resc alloc failed!!\n");
1349                 goto free_conn;
1350         }
1351
1352         return cls_conn;
1353
1354 free_conn:
1355         iscsi_conn_teardown(cls_conn);
1356         return NULL;
1357 }
1358
1359 /**
1360  * bnx2i_conn_bind - binds iscsi sess, conn and ep objects together
1361  * @cls_session:        pointer to iscsi cls session
1362  * @cls_conn:           pointer to iscsi cls conn
1363  * @transport_fd:       64-bit EP handle
1364  * @is_leading:         leading connection on this session?
1365  *
1366  * Binds together iSCSI session instance, iSCSI connection instance
1367  *      and the TCP connection. This routine returns error code if
1368  *      TCP connection does not belong on the device iSCSI sess/conn
1369  *      is bound
1370  */
1371 static int bnx2i_conn_bind(struct iscsi_cls_session *cls_session,
1372                            struct iscsi_cls_conn *cls_conn,
1373                            uint64_t transport_fd, int is_leading)
1374 {
1375         struct iscsi_conn *conn = cls_conn->dd_data;
1376         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1377         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1378         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1379         struct bnx2i_endpoint *bnx2i_ep;
1380         struct iscsi_endpoint *ep;
1381         int ret_code;
1382
1383         ep = iscsi_lookup_endpoint(transport_fd);
1384         if (!ep)
1385                 return -EINVAL;
1386         /*
1387          * Forcefully terminate all in progress connection recovery at the
1388          * earliest, either in bind(), send_pdu(LOGIN), or conn_start()
1389          */
1390         if (bnx2i_adapter_ready(hba))
1391                 return -EIO;
1392
1393         bnx2i_ep = ep->dd_data;
1394         if ((bnx2i_ep->state == EP_STATE_TCP_FIN_RCVD) ||
1395             (bnx2i_ep->state == EP_STATE_TCP_RST_RCVD))
1396                 /* Peer disconnect via' FIN or RST */
1397                 return -EINVAL;
1398
1399         if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
1400                 return -EINVAL;
1401
1402         if (bnx2i_ep->hba != hba) {
1403                 /* Error - TCP connection does not belong to this device
1404                  */
1405                 iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
1406                                   "conn bind, ep=0x%p (%s) does not",
1407                                   bnx2i_ep, bnx2i_ep->hba->netdev->name);
1408                 iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
1409                                   "belong to hba (%s)\n",
1410                                   hba->netdev->name);
1411                 return -EEXIST;
1412         }
1413         bnx2i_ep->conn = bnx2i_conn;
1414         bnx2i_conn->ep = bnx2i_ep;
1415         bnx2i_conn->iscsi_conn_cid = bnx2i_ep->ep_iscsi_cid;
1416         bnx2i_conn->fw_cid = bnx2i_ep->ep_cid;
1417
1418         ret_code = bnx2i_bind_conn_to_iscsi_cid(hba, bnx2i_conn,
1419                                                 bnx2i_ep->ep_iscsi_cid);
1420
1421         /* 5706/5708/5709 FW takes RQ as full when initiated, but for 57710
1422          * driver needs to explicitly replenish RQ index during setup.
1423          */
1424         if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
1425                 bnx2i_put_rq_buf(bnx2i_conn, 0);
1426
1427         bnx2i_arm_cq_event_coalescing(bnx2i_conn->ep, CNIC_ARM_CQE);
1428         return ret_code;
1429 }
1430
1431
1432 /**
1433  * bnx2i_conn_destroy - destroy iscsi connection instance & release resources
1434  * @cls_conn:   pointer to iscsi cls conn
1435  *
1436  * Destroy an iSCSI connection instance and release memory resources held by
1437  *      this connection
1438  */
1439 static void bnx2i_conn_destroy(struct iscsi_cls_conn *cls_conn)
1440 {
1441         struct iscsi_conn *conn = cls_conn->dd_data;
1442         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1443         struct Scsi_Host *shost;
1444         struct bnx2i_hba *hba;
1445
1446         shost = iscsi_session_to_shost(iscsi_conn_to_session(cls_conn));
1447         hba = iscsi_host_priv(shost);
1448
1449         bnx2i_conn_free_login_resources(hba, bnx2i_conn);
1450         iscsi_conn_teardown(cls_conn);
1451 }
1452
1453
1454 /**
1455  * bnx2i_conn_get_param - return iscsi connection parameter to caller
1456  * @cls_conn:   pointer to iscsi cls conn
1457  * @param:      parameter type identifier
1458  * @buf:        buffer pointer
1459  *
1460  * returns iSCSI connection parameters
1461  */
1462 static int bnx2i_conn_get_param(struct iscsi_cls_conn *cls_conn,
1463                                 enum iscsi_param param, char *buf)
1464 {
1465         struct iscsi_conn *conn = cls_conn->dd_data;
1466         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1467         int len = 0;
1468
1469         if (!(bnx2i_conn && bnx2i_conn->ep && bnx2i_conn->ep->hba))
1470                 goto out;
1471
1472         switch (param) {
1473         case ISCSI_PARAM_CONN_PORT:
1474                 mutex_lock(&bnx2i_conn->ep->hba->net_dev_lock);
1475                 if (bnx2i_conn->ep->cm_sk)
1476                         len = sprintf(buf, "%hu\n",
1477                                       bnx2i_conn->ep->cm_sk->dst_port);
1478                 mutex_unlock(&bnx2i_conn->ep->hba->net_dev_lock);
1479                 break;
1480         case ISCSI_PARAM_CONN_ADDRESS:
1481                 mutex_lock(&bnx2i_conn->ep->hba->net_dev_lock);
1482                 if (bnx2i_conn->ep->cm_sk)
1483                         len = sprintf(buf, "%pI4\n",
1484                                       &bnx2i_conn->ep->cm_sk->dst_ip);
1485                 mutex_unlock(&bnx2i_conn->ep->hba->net_dev_lock);
1486                 break;
1487         default:
1488                 return iscsi_conn_get_param(cls_conn, param, buf);
1489         }
1490 out:
1491         return len;
1492 }
1493
1494 /**
1495  * bnx2i_host_get_param - returns host (adapter) related parameters
1496  * @shost:      scsi host pointer
1497  * @param:      parameter type identifier
1498  * @buf:        buffer pointer
1499  */
1500 static int bnx2i_host_get_param(struct Scsi_Host *shost,
1501                                 enum iscsi_host_param param, char *buf)
1502 {
1503         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1504         int len = 0;
1505
1506         switch (param) {
1507         case ISCSI_HOST_PARAM_HWADDRESS:
1508                 len = sysfs_format_mac(buf, hba->cnic->mac_addr, 6);
1509                 break;
1510         case ISCSI_HOST_PARAM_NETDEV_NAME:
1511                 len = sprintf(buf, "%s\n", hba->netdev->name);
1512                 break;
1513         case ISCSI_HOST_PARAM_IPADDRESS: {
1514                 struct list_head *active_list = &hba->ep_active_list;
1515
1516                 read_lock_bh(&hba->ep_rdwr_lock);
1517                 if (!list_empty(&hba->ep_active_list)) {
1518                         struct bnx2i_endpoint *bnx2i_ep;
1519                         struct cnic_sock *csk;
1520
1521                         bnx2i_ep = list_first_entry(active_list,
1522                                                     struct bnx2i_endpoint,
1523                                                     link);
1524                         csk = bnx2i_ep->cm_sk;
1525                         if (test_bit(SK_F_IPV6, &csk->flags))
1526                                 len = sprintf(buf, "%pI6\n", csk->src_ip);
1527                         else
1528                                 len = sprintf(buf, "%pI4\n", csk->src_ip);
1529                 }
1530                 read_unlock_bh(&hba->ep_rdwr_lock);
1531                 break;
1532         }
1533         default:
1534                 return iscsi_host_get_param(shost, param, buf);
1535         }
1536         return len;
1537 }
1538
1539 /**
1540  * bnx2i_conn_start - completes iscsi connection migration to FFP
1541  * @cls_conn:   pointer to iscsi cls conn
1542  *
1543  * last call in FFP migration to handover iscsi conn to the driver
1544  */
1545 static int bnx2i_conn_start(struct iscsi_cls_conn *cls_conn)
1546 {
1547         struct iscsi_conn *conn = cls_conn->dd_data;
1548         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1549
1550         bnx2i_conn->ep->state = EP_STATE_ULP_UPDATE_START;
1551         bnx2i_update_iscsi_conn(conn);
1552
1553         /*
1554          * this should normally not sleep for a long time so it should
1555          * not disrupt the caller.
1556          */
1557         bnx2i_conn->ep->ofld_timer.expires = 1 * HZ + jiffies;
1558         bnx2i_conn->ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1559         bnx2i_conn->ep->ofld_timer.data = (unsigned long) bnx2i_conn->ep;
1560         add_timer(&bnx2i_conn->ep->ofld_timer);
1561         /* update iSCSI context for this conn, wait for CNIC to complete */
1562         wait_event_interruptible(bnx2i_conn->ep->ofld_wait,
1563                         bnx2i_conn->ep->state != EP_STATE_ULP_UPDATE_START);
1564
1565         if (signal_pending(current))
1566                 flush_signals(current);
1567         del_timer_sync(&bnx2i_conn->ep->ofld_timer);
1568
1569         iscsi_conn_start(cls_conn);
1570         return 0;
1571 }
1572
1573
1574 /**
1575  * bnx2i_conn_get_stats - returns iSCSI stats
1576  * @cls_conn:   pointer to iscsi cls conn
1577  * @stats:      pointer to iscsi statistic struct
1578  */
1579 static void bnx2i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
1580                                  struct iscsi_stats *stats)
1581 {
1582         struct iscsi_conn *conn = cls_conn->dd_data;
1583
1584         stats->txdata_octets = conn->txdata_octets;
1585         stats->rxdata_octets = conn->rxdata_octets;
1586         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
1587         stats->dataout_pdus = conn->dataout_pdus_cnt;
1588         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
1589         stats->datain_pdus = conn->datain_pdus_cnt;
1590         stats->r2t_pdus = conn->r2t_pdus_cnt;
1591         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
1592         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
1593         stats->custom_length = 3;
1594         strcpy(stats->custom[2].desc, "eh_abort_cnt");
1595         stats->custom[2].value = conn->eh_abort_cnt;
1596         stats->digest_err = 0;
1597         stats->timeout_err = 0;
1598         stats->custom_length = 0;
1599 }
1600
1601
1602 /**
1603  * bnx2i_check_route - checks if target IP route belongs to one of NX2 devices
1604  * @dst_addr:   target IP address
1605  *
1606  * check if route resolves to BNX2 device
1607  */
1608 static struct bnx2i_hba *bnx2i_check_route(struct sockaddr *dst_addr)
1609 {
1610         struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
1611         struct bnx2i_hba *hba;
1612         struct cnic_dev *cnic = NULL;
1613
1614         hba = get_adapter_list_head();
1615         if (hba && hba->cnic)
1616                 cnic = hba->cnic->cm_select_dev(desti, CNIC_ULP_ISCSI);
1617         if (!cnic) {
1618                 printk(KERN_ALERT "bnx2i: no route,"
1619                        "can't connect using cnic\n");
1620                 goto no_nx2_route;
1621         }
1622         hba = bnx2i_find_hba_for_cnic(cnic);
1623         if (!hba)
1624                 goto no_nx2_route;
1625
1626         if (bnx2i_adapter_ready(hba)) {
1627                 printk(KERN_ALERT "bnx2i: check route, hba not found\n");
1628                 goto no_nx2_route;
1629         }
1630         if (hba->netdev->mtu > hba->mtu_supported) {
1631                 printk(KERN_ALERT "bnx2i: %s network i/f mtu is set to %d\n",
1632                                   hba->netdev->name, hba->netdev->mtu);
1633                 printk(KERN_ALERT "bnx2i: iSCSI HBA can support mtu of %d\n",
1634                                   hba->mtu_supported);
1635                 goto no_nx2_route;
1636         }
1637         return hba;
1638 no_nx2_route:
1639         return NULL;
1640 }
1641
1642
1643 /**
1644  * bnx2i_tear_down_conn - tear down iscsi/tcp connection and free resources
1645  * @hba:        pointer to adapter instance
1646  * @ep:         endpoint (transport indentifier) structure
1647  *
1648  * destroys cm_sock structure and on chip iscsi context
1649  */
1650 static int bnx2i_tear_down_conn(struct bnx2i_hba *hba,
1651                                  struct bnx2i_endpoint *ep)
1652 {
1653         if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) && ep->cm_sk)
1654                 hba->cnic->cm_destroy(ep->cm_sk);
1655
1656         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type) &&
1657             ep->state == EP_STATE_DISCONN_TIMEDOUT) {
1658                 if (ep->conn && ep->conn->cls_conn &&
1659                     ep->conn->cls_conn->dd_data) {
1660                         struct iscsi_conn *conn = ep->conn->cls_conn->dd_data;
1661
1662                         /* Must suspend all rx queue activity for this ep */
1663                         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1664                 }
1665                 /* CONN_DISCONNECT timeout may or may not be an issue depending
1666                  * on what transcribed in TCP layer, different targets behave
1667                  * differently
1668                  */
1669                 printk(KERN_ALERT "bnx2i (%s): - WARN - CONN_DISCON timed out, "
1670                                   "please submit GRC Dump, NW/PCIe trace, "
1671                                   "driver msgs to developers for analysis\n",
1672                                   hba->netdev->name);
1673         }
1674
1675         ep->state = EP_STATE_CLEANUP_START;
1676         init_timer(&ep->ofld_timer);
1677         ep->ofld_timer.expires = hba->conn_ctx_destroy_tmo + jiffies;
1678         ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1679         ep->ofld_timer.data = (unsigned long) ep;
1680         add_timer(&ep->ofld_timer);
1681
1682         bnx2i_ep_destroy_list_add(hba, ep);
1683
1684         /* destroy iSCSI context, wait for it to complete */
1685         bnx2i_send_conn_destroy(hba, ep);
1686         wait_event_interruptible(ep->ofld_wait,
1687                                  (ep->state != EP_STATE_CLEANUP_START));
1688
1689         if (signal_pending(current))
1690                 flush_signals(current);
1691         del_timer_sync(&ep->ofld_timer);
1692
1693         bnx2i_ep_destroy_list_del(hba, ep);
1694
1695         if (ep->state != EP_STATE_CLEANUP_CMPL)
1696                 /* should never happen */
1697                 printk(KERN_ALERT "bnx2i - conn destroy failed\n");
1698
1699         return 0;
1700 }
1701
1702
1703 /**
1704  * bnx2i_ep_connect - establish TCP connection to target portal
1705  * @shost:              scsi host
1706  * @dst_addr:           target IP address
1707  * @non_blocking:       blocking or non-blocking call
1708  *
1709  * this routine initiates the TCP/IP connection by invoking Option-2 i/f
1710  *      with l5_core and the CNIC. This is a multi-step process of resolving
1711  *      route to target, create a iscsi connection context, handshaking with
1712  *      CNIC module to create/initialize the socket struct and finally
1713  *      sending down option-2 request to complete TCP 3-way handshake
1714  */
1715 static struct iscsi_endpoint *bnx2i_ep_connect(struct Scsi_Host *shost,
1716                                                struct sockaddr *dst_addr,
1717                                                int non_blocking)
1718 {
1719         u32 iscsi_cid = BNX2I_CID_RESERVED;
1720         struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
1721         struct sockaddr_in6 *desti6;
1722         struct bnx2i_endpoint *bnx2i_ep;
1723         struct bnx2i_hba *hba;
1724         struct cnic_dev *cnic;
1725         struct cnic_sockaddr saddr;
1726         struct iscsi_endpoint *ep;
1727         int rc = 0;
1728
1729         if (shost) {
1730                 /* driver is given scsi host to work with */
1731                 hba = iscsi_host_priv(shost);
1732         } else
1733                 /*
1734                  * check if the given destination can be reached through
1735                  * a iscsi capable NetXtreme2 device
1736                  */
1737                 hba = bnx2i_check_route(dst_addr);
1738
1739         if (!hba || test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state)) {
1740                 rc = -EINVAL;
1741                 goto nohba;
1742         }
1743
1744         cnic = hba->cnic;
1745         mutex_lock(&hba->net_dev_lock);
1746         ep = bnx2i_alloc_ep(hba);
1747         if (!ep) {
1748                 rc = -ENOMEM;
1749                 goto check_busy;
1750         }
1751         bnx2i_ep = ep->dd_data;
1752
1753         if (bnx2i_adapter_ready(hba)) {
1754                 rc = -EPERM;
1755                 goto net_if_down;
1756         }
1757
1758         bnx2i_ep->num_active_cmds = 0;
1759         iscsi_cid = bnx2i_alloc_iscsi_cid(hba);
1760         if (iscsi_cid == -1) {
1761                 printk(KERN_ALERT "alloc_ep: unable to allocate iscsi cid\n");
1762                 rc = -ENOMEM;
1763                 goto iscsi_cid_err;
1764         }
1765         bnx2i_ep->hba_age = hba->age;
1766
1767         rc = bnx2i_alloc_qp_resc(hba, bnx2i_ep);
1768         if (rc != 0) {
1769                 printk(KERN_ALERT "bnx2i: ep_conn, alloc QP resc error\n");
1770                 rc = -ENOMEM;
1771                 goto qp_resc_err;
1772         }
1773
1774         bnx2i_ep->ep_iscsi_cid = (u16)iscsi_cid;
1775         bnx2i_ep->state = EP_STATE_OFLD_START;
1776         bnx2i_ep_ofld_list_add(hba, bnx2i_ep);
1777
1778         init_timer(&bnx2i_ep->ofld_timer);
1779         bnx2i_ep->ofld_timer.expires = 2 * HZ + jiffies;
1780         bnx2i_ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1781         bnx2i_ep->ofld_timer.data = (unsigned long) bnx2i_ep;
1782         add_timer(&bnx2i_ep->ofld_timer);
1783
1784         bnx2i_send_conn_ofld_req(hba, bnx2i_ep);
1785
1786         /* Wait for CNIC hardware to setup conn context and return 'cid' */
1787         wait_event_interruptible(bnx2i_ep->ofld_wait,
1788                                  bnx2i_ep->state != EP_STATE_OFLD_START);
1789
1790         if (signal_pending(current))
1791                 flush_signals(current);
1792         del_timer_sync(&bnx2i_ep->ofld_timer);
1793
1794         bnx2i_ep_ofld_list_del(hba, bnx2i_ep);
1795
1796         if (bnx2i_ep->state != EP_STATE_OFLD_COMPL) {
1797                 rc = -ENOSPC;
1798                 goto conn_failed;
1799         }
1800
1801         rc = cnic->cm_create(cnic, CNIC_ULP_ISCSI, bnx2i_ep->ep_cid,
1802                              iscsi_cid, &bnx2i_ep->cm_sk, bnx2i_ep);
1803         if (rc) {
1804                 rc = -EINVAL;
1805                 goto conn_failed;
1806         }
1807
1808         bnx2i_ep->cm_sk->rcv_buf = 256 * 1024;
1809         bnx2i_ep->cm_sk->snd_buf = 256 * 1024;
1810         clear_bit(SK_TCP_TIMESTAMP, &bnx2i_ep->cm_sk->tcp_flags);
1811
1812         memset(&saddr, 0, sizeof(saddr));
1813         if (dst_addr->sa_family == AF_INET) {
1814                 desti = (struct sockaddr_in *) dst_addr;
1815                 saddr.remote.v4 = *desti;
1816                 saddr.local.v4.sin_family = desti->sin_family;
1817         } else if (dst_addr->sa_family == AF_INET6) {
1818                 desti6 = (struct sockaddr_in6 *) dst_addr;
1819                 saddr.remote.v6 = *desti6;
1820                 saddr.local.v6.sin6_family = desti6->sin6_family;
1821         }
1822
1823         bnx2i_ep->timestamp = jiffies;
1824         bnx2i_ep->state = EP_STATE_CONNECT_START;
1825         if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
1826                 rc = -EINVAL;
1827                 goto conn_failed;
1828         } else
1829                 rc = cnic->cm_connect(bnx2i_ep->cm_sk, &saddr);
1830         if (rc)
1831                 goto release_ep;
1832
1833         bnx2i_ep_active_list_add(hba, bnx2i_ep);
1834
1835         if (bnx2i_map_ep_dbell_regs(bnx2i_ep))
1836                 goto del_active_ep;
1837
1838         mutex_unlock(&hba->net_dev_lock);
1839         return ep;
1840
1841 del_active_ep:
1842         bnx2i_ep_active_list_del(hba, bnx2i_ep);
1843 release_ep:
1844         if (bnx2i_tear_down_conn(hba, bnx2i_ep)) {
1845                 mutex_unlock(&hba->net_dev_lock);
1846                 return ERR_PTR(rc);
1847         }
1848 conn_failed:
1849 net_if_down:
1850 iscsi_cid_err:
1851         bnx2i_free_qp_resc(hba, bnx2i_ep);
1852 qp_resc_err:
1853         bnx2i_free_ep(ep);
1854 check_busy:
1855         mutex_unlock(&hba->net_dev_lock);
1856 nohba:
1857         return ERR_PTR(rc);
1858 }
1859
1860
1861 /**
1862  * bnx2i_ep_poll - polls for TCP connection establishement
1863  * @ep:                 TCP connection (endpoint) handle
1864  * @timeout_ms:         timeout value in milli secs
1865  *
1866  * polls for TCP connect request to complete
1867  */
1868 static int bnx2i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
1869 {
1870         struct bnx2i_endpoint *bnx2i_ep;
1871         int rc = 0;
1872
1873         bnx2i_ep = ep->dd_data;
1874         if ((bnx2i_ep->state == EP_STATE_IDLE) ||
1875             (bnx2i_ep->state == EP_STATE_CONNECT_FAILED) ||
1876             (bnx2i_ep->state == EP_STATE_OFLD_FAILED))
1877                 return -1;
1878         if (bnx2i_ep->state == EP_STATE_CONNECT_COMPL)
1879                 return 1;
1880
1881         rc = wait_event_interruptible_timeout(bnx2i_ep->ofld_wait,
1882                                               ((bnx2i_ep->state ==
1883                                                 EP_STATE_OFLD_FAILED) ||
1884                                                (bnx2i_ep->state ==
1885                                                 EP_STATE_CONNECT_FAILED) ||
1886                                                (bnx2i_ep->state ==
1887                                                 EP_STATE_CONNECT_COMPL)),
1888                                               msecs_to_jiffies(timeout_ms));
1889         if (bnx2i_ep->state == EP_STATE_OFLD_FAILED)
1890                 rc = -1;
1891
1892         if (rc > 0)
1893                 return 1;
1894         else if (!rc)
1895                 return 0;       /* timeout */
1896         else
1897                 return rc;
1898 }
1899
1900
1901 /**
1902  * bnx2i_ep_tcp_conn_active - check EP state transition
1903  * @ep:         endpoint pointer
1904  *
1905  * check if underlying TCP connection is active
1906  */
1907 static int bnx2i_ep_tcp_conn_active(struct bnx2i_endpoint *bnx2i_ep)
1908 {
1909         int ret;
1910         int cnic_dev_10g = 0;
1911
1912         if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
1913                 cnic_dev_10g = 1;
1914
1915         switch (bnx2i_ep->state) {
1916         case EP_STATE_CONNECT_FAILED:
1917         case EP_STATE_CLEANUP_FAILED:
1918         case EP_STATE_OFLD_FAILED:
1919         case EP_STATE_DISCONN_TIMEDOUT:
1920                 ret = 0;
1921                 break;
1922         case EP_STATE_CONNECT_START:
1923         case EP_STATE_CONNECT_COMPL:
1924         case EP_STATE_ULP_UPDATE_START:
1925         case EP_STATE_ULP_UPDATE_COMPL:
1926         case EP_STATE_TCP_FIN_RCVD:
1927         case EP_STATE_LOGOUT_SENT:
1928         case EP_STATE_LOGOUT_RESP_RCVD:
1929         case EP_STATE_ULP_UPDATE_FAILED:
1930                 ret = 1;
1931                 break;
1932         case EP_STATE_TCP_RST_RCVD:
1933                 if (cnic_dev_10g)
1934                         ret = 0;
1935                 else
1936                         ret = 1;
1937                 break;
1938         default:
1939                 ret = 0;
1940         }
1941
1942         return ret;
1943 }
1944
1945
1946 /*
1947  * bnx2i_hw_ep_disconnect - executes TCP connection teardown process in the hw
1948  * @ep:         TCP connection (bnx2i endpoint) handle
1949  *
1950  * executes  TCP connection teardown process
1951  */
1952 int bnx2i_hw_ep_disconnect(struct bnx2i_endpoint *bnx2i_ep)
1953 {
1954         struct bnx2i_hba *hba = bnx2i_ep->hba;
1955         struct cnic_dev *cnic;
1956         struct iscsi_session *session = NULL;
1957         struct iscsi_conn *conn = NULL;
1958         int ret = 0;
1959         int close = 0;
1960         int close_ret = 0;
1961
1962         if (!hba)
1963                 return 0;
1964
1965         cnic = hba->cnic;
1966         if (!cnic)
1967                 return 0;
1968
1969         if (bnx2i_ep->state == EP_STATE_IDLE)
1970                 return 0;
1971
1972         if (!bnx2i_ep_tcp_conn_active(bnx2i_ep))
1973                 goto destroy_conn;
1974
1975         if (bnx2i_ep->conn) {
1976                 conn = bnx2i_ep->conn->cls_conn->dd_data;
1977                 session = conn->session;
1978         }
1979
1980         init_timer(&bnx2i_ep->ofld_timer);
1981         bnx2i_ep->ofld_timer.expires = hba->conn_teardown_tmo + jiffies;
1982         bnx2i_ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1983         bnx2i_ep->ofld_timer.data = (unsigned long) bnx2i_ep;
1984         add_timer(&bnx2i_ep->ofld_timer);
1985
1986         if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic))
1987                 goto out;
1988
1989         if (session) {
1990                 spin_lock_bh(&session->lock);
1991                 if (bnx2i_ep->state != EP_STATE_TCP_FIN_RCVD) {
1992                         if (session->state == ISCSI_STATE_LOGGING_OUT) {
1993                                 if (bnx2i_ep->state == EP_STATE_LOGOUT_SENT) {
1994                                         /* Logout sent, but no resp */
1995                                         printk(KERN_ALERT "bnx2i - WARNING "
1996                                                 "logout response was not "
1997                                                 "received!\n");
1998                                 } else if (bnx2i_ep->state ==
1999                                            EP_STATE_LOGOUT_RESP_RCVD)
2000                                         close = 1;
2001                         }
2002                 } else
2003                         close = 1;
2004
2005                 spin_unlock_bh(&session->lock);
2006         }
2007
2008         bnx2i_ep->state = EP_STATE_DISCONN_START;
2009
2010         if (close)
2011                 close_ret = cnic->cm_close(bnx2i_ep->cm_sk);
2012         else
2013                 close_ret = cnic->cm_abort(bnx2i_ep->cm_sk);
2014
2015         /* No longer allow CFC delete if cm_close/abort fails the request */
2016         if (close_ret)
2017                 printk(KERN_ALERT "bnx2i: %s close/abort(%d) returned %d\n",
2018                         bnx2i_ep->hba->netdev->name, close, close_ret);
2019         else
2020                 /* wait for option-2 conn teardown */
2021                 wait_event_interruptible(bnx2i_ep->ofld_wait,
2022                                  bnx2i_ep->state != EP_STATE_DISCONN_START);
2023
2024         if (signal_pending(current))
2025                 flush_signals(current);
2026         del_timer_sync(&bnx2i_ep->ofld_timer);
2027
2028 destroy_conn:
2029         bnx2i_ep_active_list_del(hba, bnx2i_ep);
2030         if (bnx2i_tear_down_conn(hba, bnx2i_ep))
2031                 ret = -EINVAL;
2032 out:
2033         bnx2i_ep->state = EP_STATE_IDLE;
2034         return ret;
2035 }
2036
2037
2038 /**
2039  * bnx2i_ep_disconnect - executes TCP connection teardown process
2040  * @ep:         TCP connection (iscsi endpoint) handle
2041  *
2042  * executes  TCP connection teardown process
2043  */
2044 static void bnx2i_ep_disconnect(struct iscsi_endpoint *ep)
2045 {
2046         struct bnx2i_endpoint *bnx2i_ep;
2047         struct bnx2i_conn *bnx2i_conn = NULL;
2048         struct iscsi_conn *conn = NULL;
2049         struct bnx2i_hba *hba;
2050
2051         bnx2i_ep = ep->dd_data;
2052
2053         /* driver should not attempt connection cleanup until TCP_CONNECT
2054          * completes either successfully or fails. Timeout is 9-secs, so
2055          * wait for it to complete
2056          */
2057         while ((bnx2i_ep->state == EP_STATE_CONNECT_START) &&
2058                 !time_after(jiffies, bnx2i_ep->timestamp + (12 * HZ)))
2059                 msleep(250);
2060
2061         if (bnx2i_ep->conn) {
2062                 bnx2i_conn = bnx2i_ep->conn;
2063                 conn = bnx2i_conn->cls_conn->dd_data;
2064                 iscsi_suspend_queue(conn);
2065         }
2066         hba = bnx2i_ep->hba;
2067
2068         mutex_lock(&hba->net_dev_lock);
2069
2070         if (bnx2i_ep->state == EP_STATE_IDLE)
2071                 goto return_bnx2i_ep;
2072
2073         if (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state))
2074                 goto free_resc;
2075
2076         if (bnx2i_ep->hba_age != hba->age)
2077                 goto free_resc;
2078
2079         /* Do all chip cleanup here */
2080         if (bnx2i_hw_ep_disconnect(bnx2i_ep)) {
2081                 mutex_unlock(&hba->net_dev_lock);
2082                 return;
2083         }
2084 free_resc:
2085         bnx2i_free_qp_resc(hba, bnx2i_ep);
2086 return_bnx2i_ep:
2087         if (bnx2i_conn)
2088                 bnx2i_conn->ep = NULL;
2089
2090         bnx2i_free_ep(ep);
2091         mutex_unlock(&hba->net_dev_lock);
2092
2093         wake_up_interruptible(&hba->eh_wait);
2094 }
2095
2096
2097 /**
2098  * bnx2i_nl_set_path - ISCSI_UEVENT_PATH_UPDATE user message handler
2099  * @buf:        pointer to buffer containing iscsi path message
2100  *
2101  */
2102 static int bnx2i_nl_set_path(struct Scsi_Host *shost, struct iscsi_path *params)
2103 {
2104         struct bnx2i_hba *hba = iscsi_host_priv(shost);
2105         char *buf = (char *) params;
2106         u16 len = sizeof(*params);
2107
2108         /* handled by cnic driver */
2109         hba->cnic->iscsi_nl_msg_recv(hba->cnic, ISCSI_UEVENT_PATH_UPDATE, buf,
2110                                      len);
2111
2112         return 0;
2113 }
2114
2115
2116 /*
2117  * 'Scsi_Host_Template' structure and 'iscsi_tranport' structure template
2118  * used while registering with the scsi host and iSCSI transport module.
2119  */
2120 static struct scsi_host_template bnx2i_host_template = {
2121         .module                 = THIS_MODULE,
2122         .name                   = "Broadcom Offload iSCSI Initiator",
2123         .proc_name              = "bnx2i",
2124         .queuecommand           = iscsi_queuecommand,
2125         .eh_abort_handler       = iscsi_eh_abort,
2126         .eh_device_reset_handler = iscsi_eh_device_reset,
2127         .eh_target_reset_handler = iscsi_eh_recover_target,
2128         .change_queue_depth     = iscsi_change_queue_depth,
2129         .can_queue              = 1024,
2130         .max_sectors            = 127,
2131         .cmd_per_lun            = 32,
2132         .this_id                = -1,
2133         .use_clustering         = ENABLE_CLUSTERING,
2134         .sg_tablesize           = ISCSI_MAX_BDS_PER_CMD,
2135         .shost_attrs            = bnx2i_dev_attributes,
2136 };
2137
2138 struct iscsi_transport bnx2i_iscsi_transport = {
2139         .owner                  = THIS_MODULE,
2140         .name                   = "bnx2i",
2141         .caps                   = CAP_RECOVERY_L0 | CAP_HDRDGST |
2142                                   CAP_MULTI_R2T | CAP_DATADGST |
2143                                   CAP_DATA_PATH_OFFLOAD,
2144         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
2145                                   ISCSI_MAX_XMIT_DLENGTH |
2146                                   ISCSI_HDRDGST_EN |
2147                                   ISCSI_DATADGST_EN |
2148                                   ISCSI_INITIAL_R2T_EN |
2149                                   ISCSI_MAX_R2T |
2150                                   ISCSI_IMM_DATA_EN |
2151                                   ISCSI_FIRST_BURST |
2152                                   ISCSI_MAX_BURST |
2153                                   ISCSI_PDU_INORDER_EN |
2154                                   ISCSI_DATASEQ_INORDER_EN |
2155                                   ISCSI_ERL |
2156                                   ISCSI_CONN_PORT |
2157                                   ISCSI_CONN_ADDRESS |
2158                                   ISCSI_EXP_STATSN |
2159                                   ISCSI_PERSISTENT_PORT |
2160                                   ISCSI_PERSISTENT_ADDRESS |
2161                                   ISCSI_TARGET_NAME | ISCSI_TPGT |
2162                                   ISCSI_USERNAME | ISCSI_PASSWORD |
2163                                   ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
2164                                   ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
2165                                   ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
2166                                   ISCSI_PING_TMO | ISCSI_RECV_TMO |
2167                                   ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
2168         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
2169                                   ISCSI_HOST_NETDEV_NAME,
2170         .create_session         = bnx2i_session_create,
2171         .destroy_session        = bnx2i_session_destroy,
2172         .create_conn            = bnx2i_conn_create,
2173         .bind_conn              = bnx2i_conn_bind,
2174         .destroy_conn           = bnx2i_conn_destroy,
2175         .set_param              = iscsi_set_param,
2176         .get_conn_param         = bnx2i_conn_get_param,
2177         .get_session_param      = iscsi_session_get_param,
2178         .get_host_param         = bnx2i_host_get_param,
2179         .start_conn             = bnx2i_conn_start,
2180         .stop_conn              = iscsi_conn_stop,
2181         .send_pdu               = iscsi_conn_send_pdu,
2182         .xmit_task              = bnx2i_task_xmit,
2183         .get_stats              = bnx2i_conn_get_stats,
2184         /* TCP connect - disconnect - option-2 interface calls */
2185         .ep_connect             = bnx2i_ep_connect,
2186         .ep_poll                = bnx2i_ep_poll,
2187         .ep_disconnect          = bnx2i_ep_disconnect,
2188         .set_path               = bnx2i_nl_set_path,
2189         /* Error recovery timeout call */
2190         .session_recovery_timedout = iscsi_session_recovery_timedout,
2191         .cleanup_task           = bnx2i_cleanup_task,
2192 };