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 <scsi/scsi_tcq.h>
  16 #include <scsi/libiscsi.h>
  17 #include "bnx2i.h"
  18
  19 struct scsi_transport_template *bnx2i_scsi_xport_template;
  20 struct iscsi_transport bnx2i_iscsi_transport;
  21 static struct scsi_host_template bnx2i_host_template;
  22
  23 /*
  24  * Global endpoint resource info
  25  */
  26 static DEFINE_SPINLOCK(bnx2i_resc_lock); /* protects global resources */
  27
  28
  29 static int bnx2i_adapter_ready(struct bnx2i_hba *hba)
  30 {
  31         int retval = 0;
  32
  33         if (!hba || !test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
  34             test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
  35             test_bit(ADAPTER_STATE_LINK_DOWN, &hba->adapter_state))
  36                 retval = -EPERM;
  37         return retval;
  38 }
  39
  40 /**
  41  * bnx2i_get_write_cmd_bd_idx - identifies various BD bookmarks
  42  * @cmd:                iscsi cmd struct pointer
  43  * @buf_off:            absolute buffer offset
  44  * @start_bd_off:       u32 pointer to return the offset within the BD
  45  *                      indicated by 'start_bd_idx' on which 'buf_off' falls
  46  * @start_bd_idx:       index of the BD on which 'buf_off' falls
  47  *
  48  * identifies & marks various bd info for scsi command's imm data,
  49  * unsolicited data and the first solicited data seq.
  50  */
  51 static void bnx2i_get_write_cmd_bd_idx(struct bnx2i_cmd *cmd, u32 buf_off,
  52                                        u32 *start_bd_off, u32 *start_bd_idx)
  53 {
  54         struct iscsi_bd *bd_tbl = cmd->io_tbl.bd_tbl;
  55         u32 cur_offset = 0;
  56         u32 cur_bd_idx = 0;
  57
  58         if (buf_off) {
  59                 while (buf_off >= (cur_offset + bd_tbl->buffer_length)) {
  60                         cur_offset += bd_tbl->buffer_length;
  61                         cur_bd_idx++;
  62                         bd_tbl++;
  63                 }
  64         }
  65
  66         *start_bd_off = buf_off - cur_offset;
  67         *start_bd_idx = cur_bd_idx;
  68 }
  69
  70 /**
  71  * bnx2i_setup_write_cmd_bd_info - sets up BD various information
  72  * @task:       transport layer's cmd struct pointer
  73  *
  74  * identifies & marks various bd info for scsi command's immediate data,
  75  * unsolicited data and first solicited data seq which includes BD start
  76  * index & BD buf off. his function takes into account iscsi parameter such
  77  * as immediate data and unsolicited data is support on this connection.
  78  */
  79 static void bnx2i_setup_write_cmd_bd_info(struct iscsi_task *task)
  80 {
  81         struct bnx2i_cmd *cmd = task->dd_data;
  82         u32 start_bd_offset;
  83         u32 start_bd_idx;
  84         u32 buffer_offset = 0;
  85         u32 cmd_len = cmd->req.total_data_transfer_length;
  86
  87         /* if ImmediateData is turned off & IntialR2T is turned on,
  88          * there will be no immediate or unsolicited data, just return.
  89          */
  90         if (!iscsi_task_has_unsol_data(task) && !task->imm_count)
  91                 return;
  92
  93         /* Immediate data */
  94         buffer_offset += task->imm_count;
  95         if (task->imm_count == cmd_len)
  96                 return;
  97
  98         if (iscsi_task_has_unsol_data(task)) {
  99                 bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
 100                                            &start_bd_offset, &start_bd_idx);
 101                 cmd->req.ud_buffer_offset = start_bd_offset;
 102                 cmd->req.ud_start_bd_index = start_bd_idx;
 103                 buffer_offset += task->unsol_r2t.data_length;
 104         }
 105
 106         if (buffer_offset != cmd_len) {
 107                 bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
 108                                            &start_bd_offset, &start_bd_idx);
 109                 if ((start_bd_offset > task->conn->session->first_burst) ||
 110                     (start_bd_idx > scsi_sg_count(cmd->scsi_cmd))) {
 111                         int i = 0;
 112
 113                         iscsi_conn_printk(KERN_ALERT, task->conn,
 114                                           "bnx2i- error, buf offset 0x%x "
 115                                           "bd_valid %d use_sg %d\n",
 116                                           buffer_offset, cmd->io_tbl.bd_valid,
 117                                           scsi_sg_count(cmd->scsi_cmd));
 118                         for (i = 0; i < cmd->io_tbl.bd_valid; i++)
 119                                 iscsi_conn_printk(KERN_ALERT, task->conn,
 120                                                   "bnx2i err, bd[%d]: len %x\n",
 121                                                   i, cmd->io_tbl.bd_tbl[i].\
 122                                                   buffer_length);
 123                 }
 124                 cmd->req.sd_buffer_offset = start_bd_offset;
 125                 cmd->req.sd_start_bd_index = start_bd_idx;
 126         }
 127 }
 128
 129
 130
 131 /**
 132  * bnx2i_map_scsi_sg - maps IO buffer and prepares the BD table
 133  * @hba:        adapter instance
 134  * @cmd:        iscsi cmd struct pointer
 135  *
 136  * map SG list
 137  */
 138 static int bnx2i_map_scsi_sg(struct bnx2i_hba *hba, struct bnx2i_cmd *cmd)
 139 {
 140         struct scsi_cmnd *sc = cmd->scsi_cmd;
 141         struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
 142         struct scatterlist *sg;
 143         int byte_count = 0;
 144         int bd_count = 0;
 145         int sg_count;
 146         int sg_len;
 147         u64 addr;
 148         int i;
 149
 150         BUG_ON(scsi_sg_count(sc) > ISCSI_MAX_BDS_PER_CMD);
 151
 152         sg_count = scsi_dma_map(sc);
 153
 154         scsi_for_each_sg(sc, sg, sg_count, i) {
 155                 sg_len = sg_dma_len(sg);
 156                 addr = (u64) sg_dma_address(sg);
 157                 bd[bd_count].buffer_addr_lo = addr & 0xffffffff;
 158                 bd[bd_count].buffer_addr_hi = addr >> 32;
 159                 bd[bd_count].buffer_length = sg_len;
 160                 bd[bd_count].flags = 0;
 161                 if (bd_count == 0)
 162                         bd[bd_count].flags = ISCSI_BD_FIRST_IN_BD_CHAIN;
 163
 164                 byte_count += sg_len;
 165                 bd_count++;
 166         }
 167
 168         if (bd_count)
 169                 bd[bd_count - 1].flags |= ISCSI_BD_LAST_IN_BD_CHAIN;
 170
 171         BUG_ON(byte_count != scsi_bufflen(sc));
 172         return bd_count;
 173 }
 174
 175 /**
 176  * bnx2i_iscsi_map_sg_list - maps SG list
 177  * @cmd:        iscsi cmd struct pointer
 178  *
 179  * creates BD list table for the command
 180  */
 181 static void bnx2i_iscsi_map_sg_list(struct bnx2i_cmd *cmd)
 182 {
 183         int bd_count;
 184
 185         bd_count  = bnx2i_map_scsi_sg(cmd->conn->hba, cmd);
 186         if (!bd_count) {
 187                 struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
 188
 189                 bd[0].buffer_addr_lo = bd[0].buffer_addr_hi = 0;
 190                 bd[0].buffer_length = bd[0].flags = 0;
 191         }
 192         cmd->io_tbl.bd_valid = bd_count;
 193 }
 194
 195
 196 /**
 197  * bnx2i_iscsi_unmap_sg_list - unmaps SG list
 198  * @cmd:        iscsi cmd struct pointer
 199  *
 200  * unmap IO buffers and invalidate the BD table
 201  */
 202 void bnx2i_iscsi_unmap_sg_list(struct bnx2i_cmd *cmd)
 203 {
 204         struct scsi_cmnd *sc = cmd->scsi_cmd;
 205
 206         if (cmd->io_tbl.bd_valid && sc) {
 207                 scsi_dma_unmap(sc);
 208                 cmd->io_tbl.bd_valid = 0;
 209         }
 210 }
 211
 212 static void bnx2i_setup_cmd_wqe_template(struct bnx2i_cmd *cmd)
 213 {
 214         memset(&cmd->req, 0x00, sizeof(cmd->req));
 215         cmd->req.op_code = 0xFF;
 216         cmd->req.bd_list_addr_lo = (u32) cmd->io_tbl.bd_tbl_dma;
 217         cmd->req.bd_list_addr_hi =
 218                 (u32) ((u64) cmd->io_tbl.bd_tbl_dma >> 32);
 219
 220 }
 221
 222
 223 /**
 224  * bnx2i_bind_conn_to_iscsi_cid - bind conn structure to 'iscsi_cid'
 225  * @hba:        pointer to adapter instance
 226  * @conn:       pointer to iscsi connection
 227  * @iscsi_cid:  iscsi context ID, range 0 - (MAX_CONN - 1)
 228  *
 229  * update iscsi cid table entry with connection pointer. This enables
 230  *      driver to quickly get hold of connection structure pointer in
 231  *      completion/interrupt thread using iscsi context ID
 232  */
 233 static int bnx2i_bind_conn_to_iscsi_cid(struct bnx2i_hba *hba,
 234                                         struct bnx2i_conn *bnx2i_conn,
 235                                         u32 iscsi_cid)
 236 {
 237         if (hba && hba->cid_que.conn_cid_tbl[iscsi_cid]) {
 238                 iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
 239                                  "conn bind - entry #%d not free\n", iscsi_cid);
 240                 return -EBUSY;
 241         }
 242
 243         hba->cid_que.conn_cid_tbl[iscsi_cid] = bnx2i_conn;
 244         return 0;
 245 }
 246
 247
 248 /**
 249  * bnx2i_get_conn_from_id - maps an iscsi cid to corresponding conn ptr
 250  * @hba:        pointer to adapter instance
 251  * @iscsi_cid:  iscsi context ID, range 0 - (MAX_CONN - 1)
 252  */
 253 struct bnx2i_conn *bnx2i_get_conn_from_id(struct bnx2i_hba *hba,
 254                                           u16 iscsi_cid)
 255 {
 256         if (!hba->cid_que.conn_cid_tbl) {
 257                 printk(KERN_ERR "bnx2i: ERROR - missing conn<->cid table\n");
 258                 return NULL;
 259
 260         } else if (iscsi_cid >= hba->max_active_conns) {
 261                 printk(KERN_ERR "bnx2i: wrong cid #%d\n", iscsi_cid);
 262                 return NULL;
 263         }
 264         return hba->cid_que.conn_cid_tbl[iscsi_cid];
 265 }
 266
 267
 268 /**
 269  * bnx2i_alloc_iscsi_cid - allocates a iscsi_cid from free pool
 270  * @hba:        pointer to adapter instance
 271  */
 272 static u32 bnx2i_alloc_iscsi_cid(struct bnx2i_hba *hba)
 273 {
 274         int idx;
 275
 276         if (!hba->cid_que.cid_free_cnt)
 277                 return -1;
 278
 279         idx = hba->cid_que.cid_q_cons_idx;
 280         hba->cid_que.cid_q_cons_idx++;
 281         if (hba->cid_que.cid_q_cons_idx == hba->cid_que.cid_q_max_idx)
 282                 hba->cid_que.cid_q_cons_idx = 0;
 283
 284         hba->cid_que.cid_free_cnt--;
 285         return hba->cid_que.cid_que[idx];
 286 }
 287
 288
 289 /**
 290  * bnx2i_free_iscsi_cid - returns tcp port to free list
 291  * @hba:                pointer to adapter instance
 292  * @iscsi_cid:          iscsi context ID to free
 293  */
 294 static void bnx2i_free_iscsi_cid(struct bnx2i_hba *hba, u16 iscsi_cid)
 295 {
 296         int idx;
 297
 298         if (iscsi_cid == (u16) -1)
 299                 return;
 300
 301         hba->cid_que.cid_free_cnt++;
 302
 303         idx = hba->cid_que.cid_q_prod_idx;
 304         hba->cid_que.cid_que[idx] = iscsi_cid;
 305         hba->cid_que.conn_cid_tbl[iscsi_cid] = NULL;
 306         hba->cid_que.cid_q_prod_idx++;
 307         if (hba->cid_que.cid_q_prod_idx == hba->cid_que.cid_q_max_idx)
 308                 hba->cid_que.cid_q_prod_idx = 0;
 309 }
 310
 311
 312 /**
 313  * bnx2i_setup_free_cid_que - sets up free iscsi cid queue
 314  * @hba:        pointer to adapter instance
 315  *
 316  * allocates memory for iscsi cid queue & 'cid - conn ptr' mapping table,
 317  *      and initialize table attributes
 318  */
 319 static int bnx2i_setup_free_cid_que(struct bnx2i_hba *hba)
 320 {
 321         int mem_size;
 322         int i;
 323
 324         mem_size = hba->max_active_conns * sizeof(u32);
 325         mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
 326
 327         hba->cid_que.cid_que_base = kmalloc(mem_size, GFP_KERNEL);
 328         if (!hba->cid_que.cid_que_base)
 329                 return -ENOMEM;
 330
 331         mem_size = hba->max_active_conns * sizeof(struct bnx2i_conn *);
 332         mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
 333         hba->cid_que.conn_cid_tbl = kmalloc(mem_size, GFP_KERNEL);
 334         if (!hba->cid_que.conn_cid_tbl) {
 335                 kfree(hba->cid_que.cid_que_base);
 336                 hba->cid_que.cid_que_base = NULL;
 337                 return -ENOMEM;
 338         }
 339
 340         hba->cid_que.cid_que = (u32 *)hba->cid_que.cid_que_base;
 341         hba->cid_que.cid_q_prod_idx = 0;
 342         hba->cid_que.cid_q_cons_idx = 0;
 343         hba->cid_que.cid_q_max_idx = hba->max_active_conns;
 344         hba->cid_que.cid_free_cnt = hba->max_active_conns;
 345
 346         for (i = 0; i < hba->max_active_conns; i++) {
 347                 hba->cid_que.cid_que[i] = i;
 348                 hba->cid_que.conn_cid_tbl[i] = NULL;
 349         }
 350         return 0;
 351 }
 352
 353
 354 /**
 355  * bnx2i_release_free_cid_que - releases 'iscsi_cid' queue resources
 356  * @hba:        pointer to adapter instance
 357  */
 358 static void bnx2i_release_free_cid_que(struct bnx2i_hba *hba)
 359 {
 360         kfree(hba->cid_que.cid_que_base);
 361         hba->cid_que.cid_que_base = NULL;
 362
 363         kfree(hba->cid_que.conn_cid_tbl);
 364         hba->cid_que.conn_cid_tbl = NULL;
 365 }
 366
 367
 368 /**
 369  * bnx2i_alloc_ep - allocates ep structure from global pool
 370  * @hba:        pointer to adapter instance
 371  *
 372  * routine allocates a free endpoint structure from global pool and
 373  *      a tcp port to be used for this connection.  Global resource lock,
 374  *      'bnx2i_resc_lock' is held while accessing shared global data structures
 375  */
 376 static struct iscsi_endpoint *bnx2i_alloc_ep(struct bnx2i_hba *hba)
 377 {
 378         struct iscsi_endpoint *ep;
 379         struct bnx2i_endpoint *bnx2i_ep;
 380
 381         ep = iscsi_create_endpoint(sizeof(*bnx2i_ep));
 382         if (!ep) {
 383                 printk(KERN_ERR "bnx2i: Could not allocate ep\n");
 384                 return NULL;
 385         }
 386
 387         bnx2i_ep = ep->dd_data;
 388         INIT_LIST_HEAD(&bnx2i_ep->link);
 389         bnx2i_ep->state = EP_STATE_IDLE;
 390         bnx2i_ep->ep_iscsi_cid = (u16) -1;
 391         bnx2i_ep->hba = hba;
 392         bnx2i_ep->hba_age = hba->age;
 393         hba->ofld_conns_active++;
 394         init_waitqueue_head(&bnx2i_ep->ofld_wait);
 395         return ep;
 396 }
 397
 398
 399 /**
 400  * bnx2i_free_ep - free endpoint
 401  * @ep:         pointer to iscsi endpoint structure
 402  */
 403 static void bnx2i_free_ep(struct iscsi_endpoint *ep)
 404 {
 405         struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
 406         unsigned long flags;
 407
 408         spin_lock_irqsave(&bnx2i_resc_lock, flags);
 409         bnx2i_ep->state = EP_STATE_IDLE;
 410         bnx2i_ep->hba->ofld_conns_active--;
 411
 412         bnx2i_free_iscsi_cid(bnx2i_ep->hba, bnx2i_ep->ep_iscsi_cid);
 413         if (bnx2i_ep->conn) {
 414                 bnx2i_ep->conn->ep = NULL;
 415                 bnx2i_ep->conn = NULL;
 416         }
 417
 418         bnx2i_ep->hba = NULL;
 419         spin_unlock_irqrestore(&bnx2i_resc_lock, flags);
 420         iscsi_destroy_endpoint(ep);
 421 }
 422
 423
 424 /**
 425  * bnx2i_alloc_bdt - allocates buffer descriptor (BD) table for the command
 426  * @hba:        adapter instance pointer
 427  * @session:    iscsi session pointer
 428  * @cmd:        iscsi command structure
 429  */
 430 static int bnx2i_alloc_bdt(struct bnx2i_hba *hba, struct iscsi_session *session,
 431                            struct bnx2i_cmd *cmd)
 432 {
 433         struct io_bdt *io = &cmd->io_tbl;
 434         struct iscsi_bd *bd;
 435
 436         io->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 437                                         ISCSI_MAX_BDS_PER_CMD * sizeof(*bd),
 438                                         &io->bd_tbl_dma, GFP_KERNEL);
 439         if (!io->bd_tbl) {
 440                 iscsi_session_printk(KERN_ERR, session, "Could not "
 441                                      "allocate bdt.\n");
 442                 return -ENOMEM;
 443         }
 444         io->bd_valid = 0;
 445         return 0;
 446 }
 447
 448 /**
 449  * bnx2i_destroy_cmd_pool - destroys iscsi command pool and release BD table
 450  * @hba:        adapter instance pointer
 451  * @session:    iscsi session pointer
 452  * @cmd:        iscsi command structure
 453  */
 454 static void bnx2i_destroy_cmd_pool(struct bnx2i_hba *hba,
 455                                    struct iscsi_session *session)
 456 {
 457         int i;
 458
 459         for (i = 0; i < session->cmds_max; i++) {
 460                 struct iscsi_task *task = session->cmds[i];
 461                 struct bnx2i_cmd *cmd = task->dd_data;
 462
 463                 if (cmd->io_tbl.bd_tbl)
 464                         dma_free_coherent(&hba->pcidev->dev,
 465                                           ISCSI_MAX_BDS_PER_CMD *
 466                                           sizeof(struct iscsi_bd),
 467                                           cmd->io_tbl.bd_tbl,
 468                                           cmd->io_tbl.bd_tbl_dma);
 469         }
 470
 471 }
 472
 473
 474 /**
 475  * bnx2i_setup_cmd_pool - sets up iscsi command pool for the session
 476  * @hba:        adapter instance pointer
 477  * @session:    iscsi session pointer
 478  */
 479 static int bnx2i_setup_cmd_pool(struct bnx2i_hba *hba,
 480                                 struct iscsi_session *session)
 481 {
 482         int i;
 483
 484         for (i = 0; i < session->cmds_max; i++) {
 485                 struct iscsi_task *task = session->cmds[i];
 486                 struct bnx2i_cmd *cmd = task->dd_data;
 487
 488                 /* Anil */
 489                 task->hdr = &cmd->hdr;
 490                 task->hdr_max = sizeof(struct iscsi_hdr);
 491
 492                 if (bnx2i_alloc_bdt(hba, session, cmd))
 493                         goto free_bdts;
 494         }
 495
 496         return 0;
 497
 498 free_bdts:
 499         bnx2i_destroy_cmd_pool(hba, session);
 500         return -ENOMEM;
 501 }
 502
 503
 504 /**
 505  * bnx2i_setup_mp_bdt - allocate BD table resources
 506  * @hba:        pointer to adapter structure
 507  *
 508  * Allocate memory for dummy buffer and associated BD
 509  * table to be used by middle path (MP) requests
 510  */
 511 static int bnx2i_setup_mp_bdt(struct bnx2i_hba *hba)
 512 {
 513         int rc = 0;
 514         struct iscsi_bd *mp_bdt;
 515         u64 addr;
 516
 517         hba->mp_bd_tbl = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 518                                             &hba->mp_bd_dma, GFP_KERNEL);
 519         if (!hba->mp_bd_tbl) {
 520                 printk(KERN_ERR "unable to allocate Middle Path BDT\n");
 521                 rc = -1;
 522                 goto out;
 523         }
 524
 525         hba->dummy_buffer = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 526                                                &hba->dummy_buf_dma, GFP_KERNEL);
 527         if (!hba->dummy_buffer) {
 528                 printk(KERN_ERR "unable to alloc Middle Path Dummy Buffer\n");
 529                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 530                                   hba->mp_bd_tbl, hba->mp_bd_dma);
 531                 hba->mp_bd_tbl = NULL;
 532                 rc = -1;
 533                 goto out;
 534         }
 535
 536         mp_bdt = (struct iscsi_bd *) hba->mp_bd_tbl;
 537         addr = (unsigned long) hba->dummy_buf_dma;
 538         mp_bdt->buffer_addr_lo = addr & 0xffffffff;
 539         mp_bdt->buffer_addr_hi = addr >> 32;
 540         mp_bdt->buffer_length = PAGE_SIZE;
 541         mp_bdt->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
 542                         ISCSI_BD_FIRST_IN_BD_CHAIN;
 543 out:
 544         return rc;
 545 }
 546
 547
 548 /**
 549  * bnx2i_free_mp_bdt - releases ITT back to free pool
 550  * @hba:        pointer to adapter instance
 551  *
 552  * free MP dummy buffer and associated BD table
 553  */
 554 static void bnx2i_free_mp_bdt(struct bnx2i_hba *hba)
 555 {
 556         if (hba->mp_bd_tbl) {
 557                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 558                                   hba->mp_bd_tbl, hba->mp_bd_dma);
 559                 hba->mp_bd_tbl = NULL;
 560         }
 561         if (hba->dummy_buffer) {
 562                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 563                                   hba->dummy_buffer, hba->dummy_buf_dma);
 564                 hba->dummy_buffer = NULL;
 565         }
 566                 return;
 567 }
 568
 569 /**
 570  * bnx2i_drop_session - notifies iscsid of connection error.
 571  * @hba:        adapter instance pointer
 572  * @session:    iscsi session pointer
 573  *
 574  * This notifies iscsid that there is a error, so it can initiate
 575  * recovery.
 576  *
 577  * This relies on caller using the iscsi class iterator so the object
 578  * is refcounted and does not disapper from under us.
 579  */
 580 void bnx2i_drop_session(struct iscsi_cls_session *cls_session)
 581 {
 582         iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
 583 }
 584
 585 /**
 586  * bnx2i_ep_destroy_list_add - add an entry to EP destroy list
 587  * @hba:        pointer to adapter instance
 588  * @ep:         pointer to endpoint (transport indentifier) structure
 589  *
 590  * EP destroy queue manager
 591  */
 592 static int bnx2i_ep_destroy_list_add(struct bnx2i_hba *hba,
 593                                      struct bnx2i_endpoint *ep)
 594 {
 595         write_lock_bh(&hba->ep_rdwr_lock);
 596         list_add_tail(&ep->link, &hba->ep_destroy_list);
 597         write_unlock_bh(&hba->ep_rdwr_lock);
 598         return 0;
 599 }
 600
 601 /**
 602  * bnx2i_ep_destroy_list_del - add an entry to EP destroy list
 603  *
 604  * @hba:                pointer to adapter instance
 605  * @ep:                 pointer to endpoint (transport indentifier) structure
 606  *
 607  * EP destroy queue manager
 608  */
 609 static int bnx2i_ep_destroy_list_del(struct bnx2i_hba *hba,
 610                                      struct bnx2i_endpoint *ep)
 611 {
 612         write_lock_bh(&hba->ep_rdwr_lock);
 613         list_del_init(&ep->link);
 614         write_unlock_bh(&hba->ep_rdwr_lock);
 615
 616         return 0;
 617 }
 618
 619 /**
 620  * bnx2i_ep_ofld_list_add - add an entry to ep offload pending list
 621  * @hba:        pointer to adapter instance
 622  * @ep:         pointer to endpoint (transport indentifier) structure
 623  *
 624  * pending conn offload completion queue manager
 625  */
 626 static int bnx2i_ep_ofld_list_add(struct bnx2i_hba *hba,
 627                                   struct bnx2i_endpoint *ep)
 628 {
 629         write_lock_bh(&hba->ep_rdwr_lock);
 630         list_add_tail(&ep->link, &hba->ep_ofld_list);
 631         write_unlock_bh(&hba->ep_rdwr_lock);
 632         return 0;
 633 }
 634
 635 /**
 636  * bnx2i_ep_ofld_list_del - add an entry to ep offload pending list
 637  * @hba:                pointer to adapter instance
 638  * @ep:                 pointer to endpoint (transport indentifier) structure
 639  *
 640  * pending conn offload completion queue manager
 641  */
 642 static int bnx2i_ep_ofld_list_del(struct bnx2i_hba *hba,
 643                                   struct bnx2i_endpoint *ep)
 644 {
 645         write_lock_bh(&hba->ep_rdwr_lock);
 646         list_del_init(&ep->link);
 647         write_unlock_bh(&hba->ep_rdwr_lock);
 648         return 0;
 649 }
 650
 651
 652 /**
 653  * bnx2i_find_ep_in_ofld_list - find iscsi_cid in pending list of endpoints
 654  *
 655  * @hba:                pointer to adapter instance
 656  * @iscsi_cid:          iscsi context ID to find
 657  *
 658  */
 659 struct bnx2i_endpoint *
 660 bnx2i_find_ep_in_ofld_list(struct bnx2i_hba *hba, u32 iscsi_cid)
 661 {
 662         struct list_head *list;
 663         struct list_head *tmp;
 664         struct bnx2i_endpoint *ep;
 665
 666         read_lock_bh(&hba->ep_rdwr_lock);
 667         list_for_each_safe(list, tmp, &hba->ep_ofld_list) {
 668                 ep = (struct bnx2i_endpoint *)list;
 669
 670                 if (ep->ep_iscsi_cid == iscsi_cid)
 671                         break;
 672                 ep = NULL;
 673         }
 674         read_unlock_bh(&hba->ep_rdwr_lock);
 675
 676         if (!ep)
 677                 printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
 678         return ep;
 679 }
 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_setup_host_queue_size - assigns shost->can_queue param
 713  * @hba:        pointer to adapter instance
 714  * @shost:      scsi host pointer
 715  *
 716  * Initializes 'can_queue' parameter based on how many outstanding commands
 717  *      the device can handle. Each device 5708/5709/57710 has different
 718  *      capabilities
 719  */
 720 static void bnx2i_setup_host_queue_size(struct bnx2i_hba *hba,
 721                                         struct Scsi_Host *shost)
 722 {
 723         if (test_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type))
 724                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
 725         else if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type))
 726                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5709;
 727         else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
 728                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_57710;
 729         else
 730                 shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
 731 }
 732
 733
 734 /**
 735  * bnx2i_alloc_hba - allocate and init adapter instance
 736  * @cnic:       cnic device pointer
 737  *
 738  * allocate & initialize adapter structure and call other
 739  *      support routines to do per adapter initialization
 740  */
 741 struct bnx2i_hba *bnx2i_alloc_hba(struct cnic_dev *cnic)
 742 {
 743         struct Scsi_Host *shost;
 744         struct bnx2i_hba *hba;
 745
 746         shost = iscsi_host_alloc(&bnx2i_host_template, sizeof(*hba), 0);
 747         if (!shost)
 748                 return NULL;
 749         shost->dma_boundary = cnic->pcidev->dma_mask;
 750         shost->transportt = bnx2i_scsi_xport_template;
 751         shost->max_id = ISCSI_MAX_CONNS_PER_HBA;
 752         shost->max_channel = 0;
 753         shost->max_lun = 512;
 754         shost->max_cmd_len = 16;
 755
 756         hba = iscsi_host_priv(shost);
 757         hba->shost = shost;
 758         hba->netdev = cnic->netdev;
 759         /* Get PCI related information and update hba struct members */
 760         hba->pcidev = cnic->pcidev;
 761         pci_dev_get(hba->pcidev);
 762         hba->pci_did = hba->pcidev->device;
 763         hba->pci_vid = hba->pcidev->vendor;
 764         hba->pci_sdid = hba->pcidev->subsystem_device;
 765         hba->pci_svid = hba->pcidev->subsystem_vendor;
 766         hba->pci_func = PCI_FUNC(hba->pcidev->devfn);
 767         hba->pci_devno = PCI_SLOT(hba->pcidev->devfn);
 768         bnx2i_identify_device(hba);
 769
 770         bnx2i_identify_device(hba);
 771         bnx2i_setup_host_queue_size(hba, shost);
 772
 773         if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type)) {
 774                 hba->regview = ioremap_nocache(hba->netdev->base_addr,
 775                                                BNX2_MQ_CONFIG2);
 776                 if (!hba->regview)
 777                         goto ioreg_map_err;
 778         } else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
 779                 hba->regview = ioremap_nocache(hba->netdev->base_addr, 4096);
 780                 if (!hba->regview)
 781                         goto ioreg_map_err;
 782         }
 783
 784         if (bnx2i_setup_mp_bdt(hba))
 785                 goto mp_bdt_mem_err;
 786
 787         INIT_LIST_HEAD(&hba->ep_ofld_list);
 788         INIT_LIST_HEAD(&hba->ep_destroy_list);
 789         rwlock_init(&hba->ep_rdwr_lock);
 790
 791         hba->mtu_supported = BNX2I_MAX_MTU_SUPPORTED;
 792
 793         /* different values for 5708/5709/57710 */
 794         hba->max_active_conns = ISCSI_MAX_CONNS_PER_HBA;
 795
 796         if (bnx2i_setup_free_cid_que(hba))
 797                 goto cid_que_err;
 798
 799         /* SQ/RQ/CQ size can be changed via sysfx interface */
 800         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
 801                 if (sq_size && sq_size <= BNX2I_5770X_SQ_WQES_MAX)
 802                         hba->max_sqes = sq_size;
 803                 else
 804                         hba->max_sqes = BNX2I_5770X_SQ_WQES_DEFAULT;
 805         } else {        /* 5706/5708/5709 */
 806                 if (sq_size && sq_size <= BNX2I_570X_SQ_WQES_MAX)
 807                         hba->max_sqes = sq_size;
 808                 else
 809                         hba->max_sqes = BNX2I_570X_SQ_WQES_DEFAULT;
 810         }
 811
 812         hba->max_rqes = rq_size;
 813         hba->max_cqes = hba->max_sqes + rq_size;
 814         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
 815                 if (hba->max_cqes > BNX2I_5770X_CQ_WQES_MAX)
 816                         hba->max_cqes = BNX2I_5770X_CQ_WQES_MAX;
 817         } else if (hba->max_cqes > BNX2I_570X_CQ_WQES_MAX)
 818                 hba->max_cqes = BNX2I_570X_CQ_WQES_MAX;
 819
 820         hba->num_ccell = hba->max_sqes / 2;
 821
 822         spin_lock_init(&hba->lock);
 823         mutex_init(&hba->net_dev_lock);
 824
 825         if (iscsi_host_add(shost, &hba->pcidev->dev))
 826                 goto free_dump_mem;
 827         return hba;
 828
 829 free_dump_mem:
 830         bnx2i_release_free_cid_que(hba);
 831 cid_que_err:
 832         bnx2i_free_mp_bdt(hba);
 833 mp_bdt_mem_err:
 834         if (hba->regview) {
 835                 iounmap(hba->regview);
 836                 hba->regview = NULL;
 837         }
 838 ioreg_map_err:
 839         pci_dev_put(hba->pcidev);
 840         scsi_host_put(shost);
 841         return NULL;
 842 }
 843
 844 /**
 845  * bnx2i_free_hba- releases hba structure and resources held by the adapter
 846  * @hba:        pointer to adapter instance
 847  *
 848  * free adapter structure and call various cleanup routines.
 849  */
 850 void bnx2i_free_hba(struct bnx2i_hba *hba)
 851 {
 852         struct Scsi_Host *shost = hba->shost;
 853
 854         iscsi_host_remove(shost);
 855         INIT_LIST_HEAD(&hba->ep_ofld_list);
 856         INIT_LIST_HEAD(&hba->ep_destroy_list);
 857         pci_dev_put(hba->pcidev);
 858
 859         if (hba->regview) {
 860                 iounmap(hba->regview);
 861                 hba->regview = NULL;
 862         }
 863         bnx2i_free_mp_bdt(hba);
 864         bnx2i_release_free_cid_que(hba);
 865         iscsi_host_free(shost);
 866 }
 867
 868 /**
 869  * bnx2i_conn_free_login_resources - free DMA resources used for login process
 870  * @hba:                pointer to adapter instance
 871  * @bnx2i_conn:         iscsi connection pointer
 872  *
 873  * Login related resources, mostly BDT & payload DMA memory is freed
 874  */
 875 static void bnx2i_conn_free_login_resources(struct bnx2i_hba *hba,
 876                                             struct bnx2i_conn *bnx2i_conn)
 877 {
 878         if (bnx2i_conn->gen_pdu.resp_bd_tbl) {
 879                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 880                                   bnx2i_conn->gen_pdu.resp_bd_tbl,
 881                                   bnx2i_conn->gen_pdu.resp_bd_dma);
 882                 bnx2i_conn->gen_pdu.resp_bd_tbl = NULL;
 883         }
 884
 885         if (bnx2i_conn->gen_pdu.req_bd_tbl) {
 886                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 887                                   bnx2i_conn->gen_pdu.req_bd_tbl,
 888                                   bnx2i_conn->gen_pdu.req_bd_dma);
 889                 bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
 890         }
 891
 892         if (bnx2i_conn->gen_pdu.resp_buf) {
 893                 dma_free_coherent(&hba->pcidev->dev,
 894                                   ISCSI_DEF_MAX_RECV_SEG_LEN,
 895                                   bnx2i_conn->gen_pdu.resp_buf,
 896                                   bnx2i_conn->gen_pdu.resp_dma_addr);
 897                 bnx2i_conn->gen_pdu.resp_buf = NULL;
 898         }
 899
 900         if (bnx2i_conn->gen_pdu.req_buf) {
 901                 dma_free_coherent(&hba->pcidev->dev,
 902                                   ISCSI_DEF_MAX_RECV_SEG_LEN,
 903                                   bnx2i_conn->gen_pdu.req_buf,
 904                                   bnx2i_conn->gen_pdu.req_dma_addr);
 905                 bnx2i_conn->gen_pdu.req_buf = NULL;
 906         }
 907 }
 908
 909 /**
 910  * bnx2i_conn_alloc_login_resources - alloc DMA resources for login/nop.
 911  * @hba:                pointer to adapter instance
 912  * @bnx2i_conn:         iscsi connection pointer
 913  *
 914  * Mgmt task DNA resources are allocated in this routine.
 915  */
 916 static int bnx2i_conn_alloc_login_resources(struct bnx2i_hba *hba,
 917                                             struct bnx2i_conn *bnx2i_conn)
 918 {
 919         /* Allocate memory for login request/response buffers */
 920         bnx2i_conn->gen_pdu.req_buf =
 921                 dma_alloc_coherent(&hba->pcidev->dev,
 922                                    ISCSI_DEF_MAX_RECV_SEG_LEN,
 923                                    &bnx2i_conn->gen_pdu.req_dma_addr,
 924                                    GFP_KERNEL);
 925         if (bnx2i_conn->gen_pdu.req_buf == NULL)
 926                 goto login_req_buf_failure;
 927
 928         bnx2i_conn->gen_pdu.req_buf_size = 0;
 929         bnx2i_conn->gen_pdu.req_wr_ptr = bnx2i_conn->gen_pdu.req_buf;
 930
 931         bnx2i_conn->gen_pdu.resp_buf =
 932                 dma_alloc_coherent(&hba->pcidev->dev,
 933                                    ISCSI_DEF_MAX_RECV_SEG_LEN,
 934                                    &bnx2i_conn->gen_pdu.resp_dma_addr,
 935                                    GFP_KERNEL);
 936         if (bnx2i_conn->gen_pdu.resp_buf == NULL)
 937                 goto login_resp_buf_failure;
 938
 939         bnx2i_conn->gen_pdu.resp_buf_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
 940         bnx2i_conn->gen_pdu.resp_wr_ptr = bnx2i_conn->gen_pdu.resp_buf;
 941
 942         bnx2i_conn->gen_pdu.req_bd_tbl =
 943                 dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 944                                    &bnx2i_conn->gen_pdu.req_bd_dma, GFP_KERNEL);
 945         if (bnx2i_conn->gen_pdu.req_bd_tbl == NULL)
 946                 goto login_req_bd_tbl_failure;
 947
 948         bnx2i_conn->gen_pdu.resp_bd_tbl =
 949                 dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 950                                    &bnx2i_conn->gen_pdu.resp_bd_dma,
 951                                    GFP_KERNEL);
 952         if (bnx2i_conn->gen_pdu.resp_bd_tbl == NULL)
 953                 goto login_resp_bd_tbl_failure;
 954
 955         return 0;
 956
 957 login_resp_bd_tbl_failure:
 958         dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 959                           bnx2i_conn->gen_pdu.req_bd_tbl,
 960                           bnx2i_conn->gen_pdu.req_bd_dma);
 961         bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
 962
 963 login_req_bd_tbl_failure:
 964         dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
 965                           bnx2i_conn->gen_pdu.resp_buf,
 966                           bnx2i_conn->gen_pdu.resp_dma_addr);
 967         bnx2i_conn->gen_pdu.resp_buf = NULL;
 968 login_resp_buf_failure:
 969         dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
 970                           bnx2i_conn->gen_pdu.req_buf,
 971                           bnx2i_conn->gen_pdu.req_dma_addr);
 972         bnx2i_conn->gen_pdu.req_buf = NULL;
 973 login_req_buf_failure:
 974         iscsi_conn_printk(KERN_ERR, bnx2i_conn->cls_conn->dd_data,
 975                           "login resource alloc failed!!\n");
 976         return -ENOMEM;
 977
 978 }
 979
 980
 981 /**
 982  * bnx2i_iscsi_prep_generic_pdu_bd - prepares BD table.
 983  * @bnx2i_conn:         iscsi connection pointer
 984  *
 985  * Allocates buffers and BD tables before shipping requests to cnic
 986  *      for PDUs prepared by 'iscsid' daemon
 987  */
 988 static void bnx2i_iscsi_prep_generic_pdu_bd(struct bnx2i_conn *bnx2i_conn)
 989 {
 990         struct iscsi_bd *bd_tbl;
 991
 992         bd_tbl = (struct iscsi_bd *) bnx2i_conn->gen_pdu.req_bd_tbl;
 993
 994         bd_tbl->buffer_addr_hi =
 995                 (u32) ((u64) bnx2i_conn->gen_pdu.req_dma_addr >> 32);
 996         bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.req_dma_addr;
 997         bd_tbl->buffer_length = bnx2i_conn->gen_pdu.req_wr_ptr -
 998                                 bnx2i_conn->gen_pdu.req_buf;
 999         bd_tbl->reserved0 = 0;
1000         bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
1001                         ISCSI_BD_FIRST_IN_BD_CHAIN;
1002
1003         bd_tbl = (struct iscsi_bd  *) bnx2i_conn->gen_pdu.resp_bd_tbl;
1004         bd_tbl->buffer_addr_hi = (u64) bnx2i_conn->gen_pdu.resp_dma_addr >> 32;
1005         bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.resp_dma_addr;
1006         bd_tbl->buffer_length = ISCSI_DEF_MAX_RECV_SEG_LEN;
1007         bd_tbl->reserved0 = 0;
1008         bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
1009                         ISCSI_BD_FIRST_IN_BD_CHAIN;
1010 }
1011
1012
1013 /**
1014  * bnx2i_iscsi_send_generic_request - called to send mgmt tasks.
1015  * @task:       transport layer task pointer
1016  *
1017  * called to transmit PDUs prepared by the 'iscsid' daemon. iSCSI login,
1018  *      Nop-out and Logout requests flow through this path.
1019  */
1020 static int bnx2i_iscsi_send_generic_request(struct iscsi_task *task)
1021 {
1022         struct bnx2i_cmd *cmd = task->dd_data;
1023         struct bnx2i_conn *bnx2i_conn = cmd->conn;
1024         int rc = 0;
1025         char *buf;
1026         int data_len;
1027
1028         bnx2i_iscsi_prep_generic_pdu_bd(bnx2i_conn);
1029         switch (task->hdr->opcode & ISCSI_OPCODE_MASK) {
1030         case ISCSI_OP_LOGIN:
1031                 bnx2i_send_iscsi_login(bnx2i_conn, task);
1032                 break;
1033         case ISCSI_OP_NOOP_OUT:
1034                 data_len = bnx2i_conn->gen_pdu.req_buf_size;
1035                 buf = bnx2i_conn->gen_pdu.req_buf;
1036                 if (data_len)
1037                         rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
1038                                                      RESERVED_ITT,
1039                                                      buf, data_len, 1);
1040                 else
1041                         rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
1042                                                      RESERVED_ITT,
1043                                                      NULL, 0, 1);
1044                 break;
1045         case ISCSI_OP_LOGOUT:
1046                 rc = bnx2i_send_iscsi_logout(bnx2i_conn, task);
1047                 break;
1048         case ISCSI_OP_SCSI_TMFUNC:
1049                 rc = bnx2i_send_iscsi_tmf(bnx2i_conn, task);
1050                 break;
1051         default:
1052                 iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
1053                                   "send_gen: unsupported op 0x%x\n",
1054                                   task->hdr->opcode);
1055         }
1056         return rc;
1057 }
1058
1059
1060 /**********************************************************************
1061  *              SCSI-ML Interface
1062  **********************************************************************/
1063
1064 /**
1065  * bnx2i_cpy_scsi_cdb - copies LUN & CDB fields in required format to sq wqe
1066  * @sc:         SCSI-ML command pointer
1067  * @cmd:        iscsi cmd pointer
1068  */
1069 static void bnx2i_cpy_scsi_cdb(struct scsi_cmnd *sc, struct bnx2i_cmd *cmd)
1070 {
1071         u32 dword;
1072         int lpcnt;
1073         u8 *srcp;
1074         u32 *dstp;
1075         u32 scsi_lun[2];
1076
1077         int_to_scsilun(sc->device->lun, (struct scsi_lun *) scsi_lun);
1078         cmd->req.lun[0] = be32_to_cpu(scsi_lun[0]);
1079         cmd->req.lun[1] = be32_to_cpu(scsi_lun[1]);
1080
1081         lpcnt = cmd->scsi_cmd->cmd_len / sizeof(dword);
1082         srcp = (u8 *) sc->cmnd;
1083         dstp = (u32 *) cmd->req.cdb;
1084         while (lpcnt--) {
1085                 memcpy(&dword, (const void *) srcp, 4);
1086                 *dstp = cpu_to_be32(dword);
1087                 srcp += 4;
1088                 dstp++;
1089         }
1090         if (sc->cmd_len & 0x3) {
1091                 dword = (u32) srcp[0] | ((u32) srcp[1] << 8);
1092                 *dstp = cpu_to_be32(dword);
1093         }
1094 }
1095
1096 static void bnx2i_cleanup_task(struct iscsi_task *task)
1097 {
1098         struct iscsi_conn *conn = task->conn;
1099         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1100         struct bnx2i_hba *hba = bnx2i_conn->hba;
1101
1102         /*
1103          * mgmt task or cmd was never sent to us to transmit.
1104          */
1105         if (!task->sc || task->state == ISCSI_TASK_PENDING)
1106                 return;
1107         /*
1108          * need to clean-up task context to claim dma buffers
1109          */
1110         if (task->state == ISCSI_TASK_ABRT_TMF) {
1111                 bnx2i_send_cmd_cleanup_req(hba, task->dd_data);
1112
1113                 spin_unlock_bh(&conn->session->lock);
1114                 wait_for_completion_timeout(&bnx2i_conn->cmd_cleanup_cmpl,
1115                                 msecs_to_jiffies(ISCSI_CMD_CLEANUP_TIMEOUT));
1116                 spin_lock_bh(&conn->session->lock);
1117         }
1118         bnx2i_iscsi_unmap_sg_list(task->dd_data);
1119 }
1120
1121 /**
1122  * bnx2i_mtask_xmit - transmit mtask to chip for further processing
1123  * @conn:       transport layer conn structure pointer
1124  * @task:       transport layer command structure pointer
1125  */
1126 static int
1127 bnx2i_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
1128 {
1129         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1130         struct bnx2i_cmd *cmd = task->dd_data;
1131
1132         memset(bnx2i_conn->gen_pdu.req_buf, 0, ISCSI_DEF_MAX_RECV_SEG_LEN);
1133
1134         bnx2i_setup_cmd_wqe_template(cmd);
1135         bnx2i_conn->gen_pdu.req_buf_size = task->data_count;
1136         if (task->data_count) {
1137                 memcpy(bnx2i_conn->gen_pdu.req_buf, task->data,
1138                        task->data_count);
1139                 bnx2i_conn->gen_pdu.req_wr_ptr =
1140                         bnx2i_conn->gen_pdu.req_buf + task->data_count;
1141         }
1142         cmd->conn = conn->dd_data;
1143         cmd->scsi_cmd = NULL;
1144         return bnx2i_iscsi_send_generic_request(task);
1145 }
1146
1147 /**
1148  * bnx2i_task_xmit - transmit iscsi command to chip for further processing
1149  * @task:       transport layer command structure pointer
1150  *
1151  * maps SG buffers and send request to chip/firmware in the form of SQ WQE
1152  */
1153 static int bnx2i_task_xmit(struct iscsi_task *task)
1154 {
1155         struct iscsi_conn *conn = task->conn;
1156         struct iscsi_session *session = conn->session;
1157         struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
1158         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1159         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1160         struct scsi_cmnd *sc = task->sc;
1161         struct bnx2i_cmd *cmd = task->dd_data;
1162         struct iscsi_cmd *hdr = (struct iscsi_cmd *) task->hdr;
1163
1164         /*
1165          * If there is no scsi_cmnd this must be a mgmt task
1166          */
1167         if (!sc)
1168                 return bnx2i_mtask_xmit(conn, task);
1169
1170         bnx2i_setup_cmd_wqe_template(cmd);
1171         cmd->req.op_code = ISCSI_OP_SCSI_CMD;
1172         cmd->conn = bnx2i_conn;
1173         cmd->scsi_cmd = sc;
1174         cmd->req.total_data_transfer_length = scsi_bufflen(sc);
1175         cmd->req.cmd_sn = be32_to_cpu(hdr->cmdsn);
1176
1177         bnx2i_iscsi_map_sg_list(cmd);
1178         bnx2i_cpy_scsi_cdb(sc, cmd);
1179
1180         cmd->req.op_attr = ISCSI_ATTR_SIMPLE;
1181         if (sc->sc_data_direction == DMA_TO_DEVICE) {
1182                 cmd->req.op_attr |= ISCSI_CMD_REQUEST_WRITE;
1183                 cmd->req.itt = task->itt |
1184                         (ISCSI_TASK_TYPE_WRITE << ISCSI_CMD_REQUEST_TYPE_SHIFT);
1185                 bnx2i_setup_write_cmd_bd_info(task);
1186         } else {
1187                 if (scsi_bufflen(sc))
1188                         cmd->req.op_attr |= ISCSI_CMD_REQUEST_READ;
1189                 cmd->req.itt = task->itt |
1190                         (ISCSI_TASK_TYPE_READ << ISCSI_CMD_REQUEST_TYPE_SHIFT);
1191         }
1192
1193         cmd->req.num_bds = cmd->io_tbl.bd_valid;
1194         if (!cmd->io_tbl.bd_valid) {
1195                 cmd->req.bd_list_addr_lo = (u32) hba->mp_bd_dma;
1196                 cmd->req.bd_list_addr_hi = (u32) ((u64) hba->mp_bd_dma >> 32);
1197                 cmd->req.num_bds = 1;
1198         }
1199
1200         bnx2i_send_iscsi_scsicmd(bnx2i_conn, cmd);
1201         return 0;
1202 }
1203
1204 /**
1205  * bnx2i_session_create - create a new iscsi session
1206  * @cmds_max:           max commands supported
1207  * @qdepth:             scsi queue depth to support
1208  * @initial_cmdsn:      initial iscsi CMDSN to be used for this session
1209  *
1210  * Creates a new iSCSI session instance on given device.
1211  */
1212 static struct iscsi_cls_session *
1213 bnx2i_session_create(struct iscsi_endpoint *ep,
1214                      uint16_t cmds_max, uint16_t qdepth,
1215                      uint32_t initial_cmdsn)
1216 {
1217         struct Scsi_Host *shost;
1218         struct iscsi_cls_session *cls_session;
1219         struct bnx2i_hba *hba;
1220         struct bnx2i_endpoint *bnx2i_ep;
1221
1222         if (!ep) {
1223                 printk(KERN_ERR "bnx2i: missing ep.\n");
1224                 return NULL;
1225         }
1226
1227         bnx2i_ep = ep->dd_data;
1228         shost = bnx2i_ep->hba->shost;
1229         hba = iscsi_host_priv(shost);
1230         if (bnx2i_adapter_ready(hba))
1231                 return NULL;
1232
1233         /*
1234          * user can override hw limit as long as it is within
1235          * the min/max.
1236          */
1237         if (cmds_max > hba->max_sqes)
1238                 cmds_max = hba->max_sqes;
1239         else if (cmds_max < BNX2I_SQ_WQES_MIN)
1240                 cmds_max = BNX2I_SQ_WQES_MIN;
1241
1242         cls_session = iscsi_session_setup(&bnx2i_iscsi_transport, shost,
1243                                           cmds_max, 0, sizeof(struct bnx2i_cmd),
1244                                           initial_cmdsn, ISCSI_MAX_TARGET);
1245         if (!cls_session)
1246                 return NULL;
1247
1248         if (bnx2i_setup_cmd_pool(hba, cls_session->dd_data))
1249                 goto session_teardown;
1250         return cls_session;
1251
1252 session_teardown:
1253         iscsi_session_teardown(cls_session);
1254         return NULL;
1255 }
1256
1257
1258 /**
1259  * bnx2i_session_destroy - destroys iscsi session
1260  * @cls_session:        pointer to iscsi cls session
1261  *
1262  * Destroys previously created iSCSI session instance and releases
1263  *      all resources held by it
1264  */
1265 static void bnx2i_session_destroy(struct iscsi_cls_session *cls_session)
1266 {
1267         struct iscsi_session *session = cls_session->dd_data;
1268         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1269         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1270
1271         bnx2i_destroy_cmd_pool(hba, session);
1272         iscsi_session_teardown(cls_session);
1273 }
1274
1275
1276 /**
1277  * bnx2i_conn_create - create iscsi connection instance
1278  * @cls_session:        pointer to iscsi cls session
1279  * @cid:                iscsi cid as per rfc (not NX2's CID terminology)
1280  *
1281  * Creates a new iSCSI connection instance for a given session
1282  */
1283 static struct iscsi_cls_conn *
1284 bnx2i_conn_create(struct iscsi_cls_session *cls_session, uint32_t cid)
1285 {
1286         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1287         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1288         struct bnx2i_conn *bnx2i_conn;
1289         struct iscsi_cls_conn *cls_conn;
1290         struct iscsi_conn *conn;
1291
1292         cls_conn = iscsi_conn_setup(cls_session, sizeof(*bnx2i_conn),
1293                                     cid);
1294         if (!cls_conn)
1295                 return NULL;
1296         conn = cls_conn->dd_data;
1297
1298         bnx2i_conn = conn->dd_data;
1299         bnx2i_conn->cls_conn = cls_conn;
1300         bnx2i_conn->hba = hba;
1301         /* 'ep' ptr will be assigned in bind() call */
1302         bnx2i_conn->ep = NULL;
1303         init_completion(&bnx2i_conn->cmd_cleanup_cmpl);
1304
1305         if (bnx2i_conn_alloc_login_resources(hba, bnx2i_conn)) {
1306                 iscsi_conn_printk(KERN_ALERT, conn,
1307                                   "conn_new: login resc alloc failed!!\n");
1308                 goto free_conn;
1309         }
1310
1311         return cls_conn;
1312
1313 free_conn:
1314         iscsi_conn_teardown(cls_conn);
1315         return NULL;
1316 }
1317
1318 /**
1319  * bnx2i_conn_bind - binds iscsi sess, conn and ep objects together
1320  * @cls_session:        pointer to iscsi cls session
1321  * @cls_conn:           pointer to iscsi cls conn
1322  * @transport_fd:       64-bit EP handle
1323  * @is_leading:         leading connection on this session?
1324  *
1325  * Binds together iSCSI session instance, iSCSI connection instance
1326  *      and the TCP connection. This routine returns error code if
1327  *      TCP connection does not belong on the device iSCSI sess/conn
1328  *      is bound
1329  */
1330 static int bnx2i_conn_bind(struct iscsi_cls_session *cls_session,
1331                            struct iscsi_cls_conn *cls_conn,
1332                            uint64_t transport_fd, int is_leading)
1333 {
1334         struct iscsi_conn *conn = cls_conn->dd_data;
1335         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1336         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1337         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1338         struct bnx2i_endpoint *bnx2i_ep;
1339         struct iscsi_endpoint *ep;
1340         int ret_code;
1341
1342         ep = iscsi_lookup_endpoint(transport_fd);
1343         if (!ep)
1344                 return -EINVAL;
1345
1346         bnx2i_ep = ep->dd_data;
1347         if ((bnx2i_ep->state == EP_STATE_TCP_FIN_RCVD) ||
1348             (bnx2i_ep->state == EP_STATE_TCP_RST_RCVD))
1349                 /* Peer disconnect via' FIN or RST */
1350                 return -EINVAL;
1351
1352         if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
1353                 return -EINVAL;
1354
1355         if (bnx2i_ep->hba != hba) {
1356                 /* Error - TCP connection does not belong to this device
1357                  */
1358                 iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
1359                                   "conn bind, ep=0x%p (%s) does not",
1360                                   bnx2i_ep, bnx2i_ep->hba->netdev->name);
1361                 iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
1362                                   "belong to hba (%s)\n",
1363                                   hba->netdev->name);
1364                 return -EEXIST;
1365         }
1366
1367         bnx2i_ep->conn = bnx2i_conn;
1368         bnx2i_conn->ep = bnx2i_ep;
1369         bnx2i_conn->iscsi_conn_cid = bnx2i_ep->ep_iscsi_cid;
1370         bnx2i_conn->fw_cid = bnx2i_ep->ep_cid;
1371
1372         ret_code = bnx2i_bind_conn_to_iscsi_cid(hba, bnx2i_conn,
1373                                                 bnx2i_ep->ep_iscsi_cid);
1374
1375         /* 5706/5708/5709 FW takes RQ as full when initiated, but for 57710
1376          * driver needs to explicitly replenish RQ index during setup.
1377          */
1378         if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
1379                 bnx2i_put_rq_buf(bnx2i_conn, 0);
1380
1381         bnx2i_arm_cq_event_coalescing(bnx2i_conn->ep, CNIC_ARM_CQE);
1382         return ret_code;
1383 }
1384
1385
1386 /**
1387  * bnx2i_conn_destroy - destroy iscsi connection instance & release resources
1388  * @cls_conn:   pointer to iscsi cls conn
1389  *
1390  * Destroy an iSCSI connection instance and release memory resources held by
1391  *      this connection
1392  */
1393 static void bnx2i_conn_destroy(struct iscsi_cls_conn *cls_conn)
1394 {
1395         struct iscsi_conn *conn = cls_conn->dd_data;
1396         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1397         struct Scsi_Host *shost;
1398         struct bnx2i_hba *hba;
1399
1400         shost = iscsi_session_to_shost(iscsi_conn_to_session(cls_conn));
1401         hba = iscsi_host_priv(shost);
1402
1403         bnx2i_conn_free_login_resources(hba, bnx2i_conn);
1404         iscsi_conn_teardown(cls_conn);
1405 }
1406
1407
1408 /**
1409  * bnx2i_conn_get_param - return iscsi connection parameter to caller
1410  * @cls_conn:   pointer to iscsi cls conn
1411  * @param:      parameter type identifier
1412  * @buf:        buffer pointer
1413  *
1414  * returns iSCSI connection parameters
1415  */
1416 static int bnx2i_conn_get_param(struct iscsi_cls_conn *cls_conn,
1417                                 enum iscsi_param param, char *buf)
1418 {
1419         struct iscsi_conn *conn = cls_conn->dd_data;
1420         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1421         int len = 0;
1422
1423         switch (param) {
1424         case ISCSI_PARAM_CONN_PORT:
1425                 if (bnx2i_conn->ep)
1426                         len = sprintf(buf, "%hu\n",
1427                                       bnx2i_conn->ep->cm_sk->dst_port);
1428                 break;
1429         case ISCSI_PARAM_CONN_ADDRESS:
1430                 if (bnx2i_conn->ep)
1431                         len = sprintf(buf, NIPQUAD_FMT "\n",
1432                                       NIPQUAD(bnx2i_conn->ep->cm_sk->dst_ip));
1433                 break;
1434         default:
1435                 return iscsi_conn_get_param(cls_conn, param, buf);
1436         }
1437
1438         return len;
1439 }
1440
1441 /**
1442  * bnx2i_host_get_param - returns host (adapter) related parameters
1443  * @shost:      scsi host pointer
1444  * @param:      parameter type identifier
1445  * @buf:        buffer pointer
1446  */
1447 static int bnx2i_host_get_param(struct Scsi_Host *shost,
1448                                 enum iscsi_host_param param, char *buf)
1449 {
1450         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1451         int len = 0;
1452
1453         switch (param) {
1454         case ISCSI_HOST_PARAM_HWADDRESS:
1455                 len = sysfs_format_mac(buf, hba->cnic->mac_addr, 6);
1456                 break;
1457         case ISCSI_HOST_PARAM_NETDEV_NAME:
1458                 len = sprintf(buf, "%s\n", hba->netdev->name);
1459                 break;
1460         default:
1461                 return iscsi_host_get_param(shost, param, buf);
1462         }
1463         return len;
1464 }
1465
1466 /**
1467  * bnx2i_conn_start - completes iscsi connection migration to FFP
1468  * @cls_conn:   pointer to iscsi cls conn
1469  *
1470  * last call in FFP migration to handover iscsi conn to the driver
1471  */
1472 static int bnx2i_conn_start(struct iscsi_cls_conn *cls_conn)
1473 {
1474         struct iscsi_conn *conn = cls_conn->dd_data;
1475         struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1476
1477         bnx2i_conn->ep->state = EP_STATE_ULP_UPDATE_START;
1478         bnx2i_update_iscsi_conn(conn);
1479
1480         /*
1481          * this should normally not sleep for a long time so it should
1482          * not disrupt the caller.
1483          */
1484         bnx2i_conn->ep->ofld_timer.expires = 1 * HZ + jiffies;
1485         bnx2i_conn->ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1486         bnx2i_conn->ep->ofld_timer.data = (unsigned long) bnx2i_conn->ep;
1487         add_timer(&bnx2i_conn->ep->ofld_timer);
1488         /* update iSCSI context for this conn, wait for CNIC to complete */
1489         wait_event_interruptible(bnx2i_conn->ep->ofld_wait,
1490                         bnx2i_conn->ep->state != EP_STATE_ULP_UPDATE_START);
1491
1492         if (signal_pending(current))
1493                 flush_signals(current);
1494         del_timer_sync(&bnx2i_conn->ep->ofld_timer);
1495
1496         iscsi_conn_start(cls_conn);
1497         return 0;
1498 }
1499
1500
1501 /**
1502  * bnx2i_conn_get_stats - returns iSCSI stats
1503  * @cls_conn:   pointer to iscsi cls conn
1504  * @stats:      pointer to iscsi statistic struct
1505  */
1506 static void bnx2i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
1507                                  struct iscsi_stats *stats)
1508 {
1509         struct iscsi_conn *conn = cls_conn->dd_data;
1510
1511         stats->txdata_octets = conn->txdata_octets;
1512         stats->rxdata_octets = conn->rxdata_octets;
1513         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
1514         stats->dataout_pdus = conn->dataout_pdus_cnt;
1515         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
1516         stats->datain_pdus = conn->datain_pdus_cnt;
1517         stats->r2t_pdus = conn->r2t_pdus_cnt;
1518         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
1519         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
1520         stats->custom_length = 3;
1521         strcpy(stats->custom[2].desc, "eh_abort_cnt");
1522         stats->custom[2].value = conn->eh_abort_cnt;
1523         stats->digest_err = 0;
1524         stats->timeout_err = 0;
1525         stats->custom_length = 0;
1526 }
1527
1528
1529 /**
1530  * bnx2i_check_route - checks if target IP route belongs to one of NX2 devices
1531  * @dst_addr:   target IP address
1532  *
1533  * check if route resolves to BNX2 device
1534  */
1535 static struct bnx2i_hba *bnx2i_check_route(struct sockaddr *dst_addr)
1536 {
1537         struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
1538         struct bnx2i_hba *hba;
1539         struct cnic_dev *cnic = NULL;
1540
1541         bnx2i_reg_dev_all();
1542
1543         hba = get_adapter_list_head();
1544         if (hba && hba->cnic)
1545                 cnic = hba->cnic->cm_select_dev(desti, CNIC_ULP_ISCSI);
1546         if (!cnic) {
1547                 printk(KERN_ALERT "bnx2i: no route,"
1548                        "can't connect using cnic\n");
1549                 goto no_nx2_route;
1550         }
1551         hba = bnx2i_find_hba_for_cnic(cnic);
1552         if (!hba)
1553                 goto no_nx2_route;
1554
1555         if (bnx2i_adapter_ready(hba)) {
1556                 printk(KERN_ALERT "bnx2i: check route, hba not found\n");
1557                 goto no_nx2_route;
1558         }
1559         if (hba->netdev->mtu > hba->mtu_supported) {
1560                 printk(KERN_ALERT "bnx2i: %s network i/f mtu is set to %d\n",
1561                                   hba->netdev->name, hba->netdev->mtu);
1562                 printk(KERN_ALERT "bnx2i: iSCSI HBA can support mtu of %d\n",
1563                                   hba->mtu_supported);
1564                 goto no_nx2_route;
1565         }
1566         return hba;
1567 no_nx2_route:
1568         return NULL;
1569 }
1570
1571
1572 /**
1573  * bnx2i_tear_down_conn - tear down iscsi/tcp connection and free resources
1574  * @hba:        pointer to adapter instance
1575  * @ep:         endpoint (transport indentifier) structure
1576  *
1577  * destroys cm_sock structure and on chip iscsi context
1578  */
1579 static int bnx2i_tear_down_conn(struct bnx2i_hba *hba,
1580                                  struct bnx2i_endpoint *ep)
1581 {
1582         if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic))
1583                 hba->cnic->cm_destroy(ep->cm_sk);
1584
1585         if (test_bit(ADAPTER_STATE_GOING_DOWN, &ep->hba->adapter_state))
1586                 ep->state = EP_STATE_DISCONN_COMPL;
1587
1588         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type) &&
1589             ep->state == EP_STATE_DISCONN_TIMEDOUT) {
1590                 printk(KERN_ALERT "bnx2i - ERROR - please submit GRC Dump,"
1591                                   " NW/PCIe trace, driver msgs to developers"
1592                                   " for analysis\n");
1593                 return 1;
1594         }
1595
1596         ep->state = EP_STATE_CLEANUP_START;
1597         init_timer(&ep->ofld_timer);
1598         ep->ofld_timer.expires = 10*HZ + jiffies;
1599         ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1600         ep->ofld_timer.data = (unsigned long) ep;
1601         add_timer(&ep->ofld_timer);
1602
1603         bnx2i_ep_destroy_list_add(hba, ep);
1604
1605         /* destroy iSCSI context, wait for it to complete */
1606         bnx2i_send_conn_destroy(hba, ep);
1607         wait_event_interruptible(ep->ofld_wait,
1608                                  (ep->state != EP_STATE_CLEANUP_START));
1609
1610         if (signal_pending(current))
1611                 flush_signals(current);
1612         del_timer_sync(&ep->ofld_timer);
1613
1614         bnx2i_ep_destroy_list_del(hba, ep);
1615
1616         if (ep->state != EP_STATE_CLEANUP_CMPL)
1617                 /* should never happen */
1618                 printk(KERN_ALERT "bnx2i - conn destroy failed\n");
1619
1620         return 0;
1621 }
1622
1623
1624 /**
1625  * bnx2i_ep_connect - establish TCP connection to target portal
1626  * @shost:              scsi host
1627  * @dst_addr:           target IP address
1628  * @non_blocking:       blocking or non-blocking call
1629  *
1630  * this routine initiates the TCP/IP connection by invoking Option-2 i/f
1631  *      with l5_core and the CNIC. This is a multi-step process of resolving
1632  *      route to target, create a iscsi connection context, handshaking with
1633  *      CNIC module to create/initialize the socket struct and finally
1634  *      sending down option-2 request to complete TCP 3-way handshake
1635  */
1636 static struct iscsi_endpoint *bnx2i_ep_connect(struct Scsi_Host *shost,
1637                                                struct sockaddr *dst_addr,
1638                                                int non_blocking)
1639 {
1640         u32 iscsi_cid = BNX2I_CID_RESERVED;
1641         struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
1642         struct sockaddr_in6 *desti6;
1643         struct bnx2i_endpoint *bnx2i_ep;
1644         struct bnx2i_hba *hba;
1645         struct cnic_dev *cnic;
1646         struct cnic_sockaddr saddr;
1647         struct iscsi_endpoint *ep;
1648         int rc = 0;
1649
1650         if (shost) {
1651                 /* driver is given scsi host to work with */
1652                 hba = iscsi_host_priv(shost);
1653                 /* Register the device with cnic if not already done so */
1654                 bnx2i_register_device(hba);
1655         } else
1656                 /*
1657                  * check if the given destination can be reached through
1658                  * a iscsi capable NetXtreme2 device
1659                  */
1660                 hba = bnx2i_check_route(dst_addr);
1661
1662         if (!hba) {
1663                 rc = -ENOMEM;
1664                 goto check_busy;
1665         }
1666
1667         cnic = hba->cnic;
1668         ep = bnx2i_alloc_ep(hba);
1669         if (!ep) {
1670                 rc = -ENOMEM;
1671                 goto check_busy;
1672         }
1673         bnx2i_ep = ep->dd_data;
1674
1675         mutex_lock(&hba->net_dev_lock);
1676         if (bnx2i_adapter_ready(hba)) {
1677                 rc = -EPERM;
1678                 goto net_if_down;
1679         }
1680
1681         bnx2i_ep->num_active_cmds = 0;
1682         iscsi_cid = bnx2i_alloc_iscsi_cid(hba);
1683         if (iscsi_cid == -1) {
1684                 printk(KERN_ALERT "alloc_ep: unable to allocate iscsi cid\n");
1685                 rc = -ENOMEM;
1686                 goto iscsi_cid_err;
1687         }
1688         bnx2i_ep->hba_age = hba->age;
1689
1690         rc = bnx2i_alloc_qp_resc(hba, bnx2i_ep);
1691         if (rc != 0) {
1692                 printk(KERN_ALERT "bnx2i: ep_conn, alloc QP resc error\n");
1693                 rc = -ENOMEM;
1694                 goto qp_resc_err;
1695         }
1696
1697         bnx2i_ep->ep_iscsi_cid = (u16)iscsi_cid;
1698         bnx2i_ep->state = EP_STATE_OFLD_START;
1699         bnx2i_ep_ofld_list_add(hba, bnx2i_ep);
1700
1701         init_timer(&bnx2i_ep->ofld_timer);
1702         bnx2i_ep->ofld_timer.expires = 2 * HZ + jiffies;
1703         bnx2i_ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1704         bnx2i_ep->ofld_timer.data = (unsigned long) bnx2i_ep;
1705         add_timer(&bnx2i_ep->ofld_timer);
1706
1707         bnx2i_send_conn_ofld_req(hba, bnx2i_ep);
1708
1709         /* Wait for CNIC hardware to setup conn context and return 'cid' */
1710         wait_event_interruptible(bnx2i_ep->ofld_wait,
1711                                  bnx2i_ep->state != EP_STATE_OFLD_START);
1712
1713         if (signal_pending(current))
1714                 flush_signals(current);
1715         del_timer_sync(&bnx2i_ep->ofld_timer);
1716
1717         bnx2i_ep_ofld_list_del(hba, bnx2i_ep);
1718
1719         if (bnx2i_ep->state != EP_STATE_OFLD_COMPL) {
1720                 rc = -ENOSPC;
1721                 goto conn_failed;
1722         }
1723
1724         rc = cnic->cm_create(cnic, CNIC_ULP_ISCSI, bnx2i_ep->ep_cid,
1725                              iscsi_cid, &bnx2i_ep->cm_sk, bnx2i_ep);
1726         if (rc) {
1727                 rc = -EINVAL;
1728                 goto conn_failed;
1729         }
1730
1731         bnx2i_ep->cm_sk->rcv_buf = 256 * 1024;
1732         bnx2i_ep->cm_sk->snd_buf = 256 * 1024;
1733         clear_bit(SK_TCP_TIMESTAMP, &bnx2i_ep->cm_sk->tcp_flags);
1734
1735         memset(&saddr, 0, sizeof(saddr));
1736         if (dst_addr->sa_family == AF_INET) {
1737                 desti = (struct sockaddr_in *) dst_addr;
1738                 saddr.remote.v4 = *desti;
1739                 saddr.local.v4.sin_family = desti->sin_family;
1740         } else if (dst_addr->sa_family == AF_INET6) {
1741                 desti6 = (struct sockaddr_in6 *) dst_addr;
1742                 saddr.remote.v6 = *desti6;
1743                 saddr.local.v6.sin6_family = desti6->sin6_family;
1744         }
1745
1746         bnx2i_ep->timestamp = jiffies;
1747         bnx2i_ep->state = EP_STATE_CONNECT_START;
1748         if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
1749                 rc = -EINVAL;
1750                 goto conn_failed;
1751         } else
1752                 rc = cnic->cm_connect(bnx2i_ep->cm_sk, &saddr);
1753
1754         if (rc)
1755                 goto release_ep;
1756
1757         if (bnx2i_map_ep_dbell_regs(bnx2i_ep))
1758                 goto release_ep;
1759         mutex_unlock(&hba->net_dev_lock);
1760         return ep;
1761
1762 release_ep:
1763         if (bnx2i_tear_down_conn(hba, bnx2i_ep)) {
1764                 mutex_unlock(&hba->net_dev_lock);
1765                 return ERR_PTR(rc);
1766         }
1767 conn_failed:
1768 net_if_down:
1769 iscsi_cid_err:
1770         bnx2i_free_qp_resc(hba, bnx2i_ep);
1771 qp_resc_err:
1772         bnx2i_free_ep(ep);
1773         mutex_unlock(&hba->net_dev_lock);
1774 check_busy:
1775         bnx2i_unreg_dev_all();
1776         return ERR_PTR(rc);
1777 }
1778
1779
1780 /**
1781  * bnx2i_ep_poll - polls for TCP connection establishement
1782  * @ep:                 TCP connection (endpoint) handle
1783  * @timeout_ms:         timeout value in milli secs
1784  *
1785  * polls for TCP connect request to complete
1786  */
1787 static int bnx2i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
1788 {
1789         struct bnx2i_endpoint *bnx2i_ep;
1790         int rc = 0;
1791
1792         bnx2i_ep = ep->dd_data;
1793         if ((bnx2i_ep->state == EP_STATE_IDLE) ||
1794             (bnx2i_ep->state == EP_STATE_CONNECT_FAILED) ||
1795             (bnx2i_ep->state == EP_STATE_OFLD_FAILED))
1796                 return -1;
1797         if (bnx2i_ep->state == EP_STATE_CONNECT_COMPL)
1798                 return 1;
1799
1800         rc = wait_event_interruptible_timeout(bnx2i_ep->ofld_wait,
1801                                               ((bnx2i_ep->state ==
1802                                                 EP_STATE_OFLD_FAILED) ||
1803                                                (bnx2i_ep->state ==
1804                                                 EP_STATE_CONNECT_FAILED) ||
1805                                                (bnx2i_ep->state ==
1806                                                 EP_STATE_CONNECT_COMPL)),
1807                                               msecs_to_jiffies(timeout_ms));
1808         if (!rc || (bnx2i_ep->state == EP_STATE_OFLD_FAILED))
1809                 rc = -1;
1810
1811         if (rc > 0)
1812                 return 1;
1813         else if (!rc)
1814                 return 0;       /* timeout */
1815         else
1816                 return rc;
1817 }
1818
1819
1820 /**
1821  * bnx2i_ep_tcp_conn_active - check EP state transition
1822  * @ep:         endpoint pointer
1823  *
1824  * check if underlying TCP connection is active
1825  */
1826 static int bnx2i_ep_tcp_conn_active(struct bnx2i_endpoint *bnx2i_ep)
1827 {
1828         int ret;
1829         int cnic_dev_10g = 0;
1830
1831         if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
1832                 cnic_dev_10g = 1;
1833
1834         switch (bnx2i_ep->state) {
1835         case EP_STATE_CONNECT_START:
1836         case EP_STATE_CLEANUP_FAILED:
1837         case EP_STATE_OFLD_FAILED:
1838         case EP_STATE_DISCONN_TIMEDOUT:
1839                 ret = 0;
1840                 break;
1841         case EP_STATE_CONNECT_COMPL:
1842         case EP_STATE_ULP_UPDATE_START:
1843         case EP_STATE_ULP_UPDATE_COMPL:
1844         case EP_STATE_TCP_FIN_RCVD:
1845         case EP_STATE_ULP_UPDATE_FAILED:
1846                 ret = 1;
1847                 break;
1848         case EP_STATE_TCP_RST_RCVD:
1849                 ret = 0;
1850                 break;
1851         case EP_STATE_CONNECT_FAILED:
1852                 if (cnic_dev_10g)
1853                         ret = 1;
1854                 else
1855                         ret = 0;
1856                 break;
1857         default:
1858                 ret = 0;
1859         }
1860
1861         return ret;
1862 }
1863
1864
1865 /**
1866  * bnx2i_ep_disconnect - executes TCP connection teardown process
1867  * @ep:         TCP connection (endpoint) handle
1868  *
1869  * executes  TCP connection teardown process
1870  */
1871 static void bnx2i_ep_disconnect(struct iscsi_endpoint *ep)
1872 {
1873         struct bnx2i_endpoint *bnx2i_ep;
1874         struct bnx2i_conn *bnx2i_conn = NULL;
1875         struct iscsi_session *session = NULL;
1876         struct iscsi_conn *conn;
1877         struct cnic_dev *cnic;
1878         struct bnx2i_hba *hba;
1879
1880         bnx2i_ep = ep->dd_data;
1881
1882         /* driver should not attempt connection cleanup untill TCP_CONNECT
1883          * completes either successfully or fails. Timeout is 9-secs, so
1884          * wait for it to complete
1885          */
1886         while ((bnx2i_ep->state == EP_STATE_CONNECT_START) &&
1887                 !time_after(jiffies, bnx2i_ep->timestamp + (12 * HZ)))
1888                 msleep(250);
1889
1890         if (bnx2i_ep->conn) {
1891                 bnx2i_conn = bnx2i_ep->conn;
1892                 conn = bnx2i_conn->cls_conn->dd_data;
1893                 session = conn->session;
1894
1895                 iscsi_suspend_queue(conn);
1896         }
1897
1898         hba = bnx2i_ep->hba;
1899         if (bnx2i_ep->state == EP_STATE_IDLE)
1900                 goto return_bnx2i_ep;
1901         cnic = hba->cnic;
1902
1903         mutex_lock(&hba->net_dev_lock);
1904
1905         if (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state))
1906                 goto free_resc;
1907         if (bnx2i_ep->hba_age != hba->age)
1908                 goto free_resc;
1909
1910         if (!bnx2i_ep_tcp_conn_active(bnx2i_ep))
1911                 goto destory_conn;
1912
1913         bnx2i_ep->state = EP_STATE_DISCONN_START;
1914
1915         init_timer(&bnx2i_ep->ofld_timer);
1916         bnx2i_ep->ofld_timer.expires = 10*HZ + jiffies;
1917         bnx2i_ep->ofld_timer.function = bnx2i_ep_ofld_timer;
1918         bnx2i_ep->ofld_timer.data = (unsigned long) bnx2i_ep;
1919         add_timer(&bnx2i_ep->ofld_timer);
1920
1921         if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
1922                 int close = 0;
1923
1924                 if (session) {
1925                         spin_lock_bh(&session->lock);
1926                         if (session->state == ISCSI_STATE_LOGGING_OUT)
1927                                 close = 1;
1928                         spin_unlock_bh(&session->lock);
1929                 }
1930                 if (close)
1931                         cnic->cm_close(bnx2i_ep->cm_sk);
1932                 else
1933                         cnic->cm_abort(bnx2i_ep->cm_sk);
1934         } else
1935                 goto free_resc;
1936
1937         /* wait for option-2 conn teardown */
1938         wait_event_interruptible(bnx2i_ep->ofld_wait,
1939                                  bnx2i_ep->state != EP_STATE_DISCONN_START);
1940
1941         if (signal_pending(current))
1942                 flush_signals(current);
1943         del_timer_sync(&bnx2i_ep->ofld_timer);
1944
1945 destory_conn:
1946         if (bnx2i_tear_down_conn(hba, bnx2i_ep)) {
1947                 mutex_unlock(&hba->net_dev_lock);
1948                 return;
1949         }
1950 free_resc:
1951         mutex_unlock(&hba->net_dev_lock);
1952         bnx2i_free_qp_resc(hba, bnx2i_ep);
1953 return_bnx2i_ep:
1954         if (bnx2i_conn)
1955                 bnx2i_conn->ep = NULL;
1956
1957         bnx2i_free_ep(ep);
1958
1959         if (!hba->ofld_conns_active)
1960                 bnx2i_unreg_dev_all();
1961 }
1962
1963
1964 /**
1965  * bnx2i_nl_set_path - ISCSI_UEVENT_PATH_UPDATE user message handler
1966  * @buf:        pointer to buffer containing iscsi path message
1967  *
1968  */
1969 static int bnx2i_nl_set_path(struct Scsi_Host *shost, struct iscsi_path *params)
1970 {
1971         struct bnx2i_hba *hba = iscsi_host_priv(shost);
1972         char *buf = (char *) params;
1973         u16 len = sizeof(*params);
1974
1975         /* handled by cnic driver */
1976         hba->cnic->iscsi_nl_msg_recv(hba->cnic, ISCSI_UEVENT_PATH_UPDATE, buf,
1977                                      len);
1978
1979         return 0;
1980 }
1981
1982
1983 /*
1984  * 'Scsi_Host_Template' structure and 'iscsi_tranport' structure template
1985  * used while registering with the scsi host and iSCSI transport module.
1986  */
1987 static struct scsi_host_template bnx2i_host_template = {
1988         .module                 = THIS_MODULE,
1989         .name                   = "Broadcom Offload iSCSI Initiator",
1990         .proc_name              = "bnx2i",
1991         .queuecommand           = iscsi_queuecommand,
1992         .eh_abort_handler       = iscsi_eh_abort,
1993         .eh_device_reset_handler = iscsi_eh_device_reset,
1994         .eh_target_reset_handler = iscsi_eh_target_reset,
1995         .can_queue              = 1024,
1996         .max_sectors            = 127,
1997         .cmd_per_lun            = 32,
1998         .this_id                = -1,
1999         .use_clustering         = ENABLE_CLUSTERING,
2000         .sg_tablesize           = ISCSI_MAX_BDS_PER_CMD,
2001         .shost_attrs            = bnx2i_dev_attributes,
2002 };
2003
2004 struct iscsi_transport bnx2i_iscsi_transport = {
2005         .owner                  = THIS_MODULE,
2006         .name                   = "bnx2i",
2007         .caps                   = CAP_RECOVERY_L0 | CAP_HDRDGST |
2008                                   CAP_MULTI_R2T | CAP_DATADGST |
2009                                   CAP_DATA_PATH_OFFLOAD,
2010         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
2011                                   ISCSI_MAX_XMIT_DLENGTH |
2012                                   ISCSI_HDRDGST_EN |
2013                                   ISCSI_DATADGST_EN |
2014                                   ISCSI_INITIAL_R2T_EN |
2015                                   ISCSI_MAX_R2T |
2016                                   ISCSI_IMM_DATA_EN |
2017                                   ISCSI_FIRST_BURST |
2018                                   ISCSI_MAX_BURST |
2019                                   ISCSI_PDU_INORDER_EN |
2020                                   ISCSI_DATASEQ_INORDER_EN |
2021                                   ISCSI_ERL |
2022                                   ISCSI_CONN_PORT |
2023                                   ISCSI_CONN_ADDRESS |
2024                                   ISCSI_EXP_STATSN |
2025                                   ISCSI_PERSISTENT_PORT |
2026                                   ISCSI_PERSISTENT_ADDRESS |
2027                                   ISCSI_TARGET_NAME | ISCSI_TPGT |
2028                                   ISCSI_USERNAME | ISCSI_PASSWORD |
2029                                   ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
2030                                   ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
2031                                   ISCSI_LU_RESET_TMO |
2032                                   ISCSI_PING_TMO | ISCSI_RECV_TMO |
2033                                   ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
2034         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_NETDEV_NAME,
2035         .create_session         = bnx2i_session_create,
2036         .destroy_session        = bnx2i_session_destroy,
2037         .create_conn            = bnx2i_conn_create,
2038         .bind_conn              = bnx2i_conn_bind,
2039         .destroy_conn           = bnx2i_conn_destroy,
2040         .set_param              = iscsi_set_param,
2041         .get_conn_param         = bnx2i_conn_get_param,
2042         .get_session_param      = iscsi_session_get_param,
2043         .get_host_param         = bnx2i_host_get_param,
2044         .start_conn             = bnx2i_conn_start,
2045         .stop_conn              = iscsi_conn_stop,
2046         .send_pdu               = iscsi_conn_send_pdu,
2047         .xmit_task              = bnx2i_task_xmit,
2048         .get_stats              = bnx2i_conn_get_stats,
2049         /* TCP connect - disconnect - option-2 interface calls */
2050         .ep_connect             = bnx2i_ep_connect,
2051         .ep_poll                = bnx2i_ep_poll,
2052         .ep_disconnect          = bnx2i_ep_disconnect,
2053         .set_path               = bnx2i_nl_set_path,
2054         /* Error recovery timeout call */
2055         .session_recovery_timedout = iscsi_session_recovery_timedout,
2056         .cleanup_task           = bnx2i_cleanup_task,
2057 };