1 /* 2 * iSCSI Initiator over iSER Data-Path 3 * 4 * Copyright (C) 2004 Dmitry Yusupov 5 * Copyright (C) 2004 Alex Aizman 6 * Copyright (C) 2005 Mike Christie 7 * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. 8 * maintained by openib-general@openib.org 9 * 10 * This software is available to you under a choice of one of two 11 * licenses. You may choose to be licensed under the terms of the GNU 12 * General Public License (GPL) Version 2, available from the file 13 * COPYING in the main directory of this source tree, or the 14 * OpenIB.org BSD license below: 15 * 16 * Redistribution and use in source and binary forms, with or 17 * without modification, are permitted provided that the following 18 * conditions are met: 19 * 20 * - Redistributions of source code must retain the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer. 23 * 24 * - Redistributions in binary form must reproduce the above 25 * copyright notice, this list of conditions and the following 26 * disclaimer in the documentation and/or other materials 27 * provided with the distribution. 28 * 29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 36 * SOFTWARE. 37 * 38 * Credits: 39 * Christoph Hellwig 40 * FUJITA Tomonori 41 * Arne Redlich 42 * Zhenyu Wang 43 * Modified by: 44 * Erez Zilber 45 */ 46 47 #include <linux/types.h> 48 #include <linux/list.h> 49 #include <linux/hardirq.h> 50 #include <linux/kfifo.h> 51 #include <linux/blkdev.h> 52 #include <linux/init.h> 53 #include <linux/ioctl.h> 54 #include <linux/cdev.h> 55 #include <linux/in.h> 56 #include <linux/net.h> 57 #include <linux/scatterlist.h> 58 #include <linux/delay.h> 59 #include <linux/slab.h> 60 61 #include <net/sock.h> 62 63 #include <asm/uaccess.h> 64 65 #include <scsi/scsi_cmnd.h> 66 #include <scsi/scsi_device.h> 67 #include <scsi/scsi_eh.h> 68 #include <scsi/scsi_tcq.h> 69 #include <scsi/scsi_host.h> 70 #include <scsi/scsi.h> 71 #include <scsi/scsi_transport_iscsi.h> 72 73 #include "iscsi_iser.h" 74 75 static struct scsi_host_template iscsi_iser_sht; 76 static struct iscsi_transport iscsi_iser_transport; 77 static struct scsi_transport_template *iscsi_iser_scsi_transport; 78 79 static unsigned int iscsi_max_lun = 512; 80 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 81 82 int iser_debug_level = 0; 83 84 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 85 "v" DRV_VER " (" DRV_DATE ")"); 86 MODULE_LICENSE("Dual BSD/GPL"); 87 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 88 89 module_param_named(debug_level, iser_debug_level, int, 0644); 90 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 91 92 struct iser_global ig; 93 94 void 95 iscsi_iser_recv(struct iscsi_conn *conn, 96 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 97 { 98 int rc = 0; 99 int datalen; 100 int ahslen; 101 102 /* verify PDU length */ 103 datalen = ntoh24(hdr->dlength); 104 if (datalen != rx_data_len) { 105 printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", 106 datalen, rx_data_len); 107 rc = ISCSI_ERR_DATALEN; 108 goto error; 109 } 110 111 /* read AHS */ 112 ahslen = hdr->hlength * 4; 113 114 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 115 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 116 goto error; 117 118 return; 119 error: 120 iscsi_conn_failure(conn, rc); 121 } 122 123 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 124 { 125 struct iscsi_iser_task *iser_task = task->dd_data; 126 127 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 128 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 129 return 0; 130 } 131 132 int iser_initialize_task_headers(struct iscsi_task *task, 133 struct iser_tx_desc *tx_desc) 134 { 135 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 136 struct iser_device *device = iser_conn->ib_conn->device; 137 struct iscsi_iser_task *iser_task = task->dd_data; 138 u64 dma_addr; 139 140 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 141 ISER_HEADERS_LEN, DMA_TO_DEVICE); 142 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 143 return -ENOMEM; 144 145 tx_desc->dma_addr = dma_addr; 146 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 147 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 148 tx_desc->tx_sg[0].lkey = device->mr->lkey; 149 150 iser_task->headers_initialized = 1; 151 iser_task->iser_conn = iser_conn; 152 return 0; 153 } 154 /** 155 * iscsi_iser_task_init - Initialize task 156 * @task: iscsi task 157 * 158 * Initialize the task for the scsi command or mgmt command. 159 */ 160 static int 161 iscsi_iser_task_init(struct iscsi_task *task) 162 { 163 struct iscsi_iser_task *iser_task = task->dd_data; 164 165 if (!iser_task->headers_initialized) 166 if (iser_initialize_task_headers(task, &iser_task->desc)) 167 return -ENOMEM; 168 169 /* mgmt task */ 170 if (!task->sc) 171 return 0; 172 173 iser_task->command_sent = 0; 174 iser_task_rdma_init(iser_task); 175 return 0; 176 } 177 178 /** 179 * iscsi_iser_mtask_xmit - xmit management(immediate) task 180 * @conn: iscsi connection 181 * @task: task management task 182 * 183 * Notes: 184 * The function can return -EAGAIN in which case caller must 185 * call it again later, or recover. '0' return code means successful 186 * xmit. 187 * 188 **/ 189 static int 190 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 191 { 192 int error = 0; 193 194 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 195 196 error = iser_send_control(conn, task); 197 198 /* since iser xmits control with zero copy, tasks can not be recycled 199 * right after sending them. 200 * The recycling scheme is based on whether a response is expected 201 * - if yes, the task is recycled at iscsi_complete_pdu 202 * - if no, the task is recycled at iser_snd_completion 203 */ 204 return error; 205 } 206 207 static int 208 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 209 struct iscsi_task *task) 210 { 211 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 212 struct iscsi_data hdr; 213 int error = 0; 214 215 /* Send data-out PDUs while there's still unsolicited data to send */ 216 while (iscsi_task_has_unsol_data(task)) { 217 iscsi_prep_data_out_pdu(task, r2t, &hdr); 218 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 219 hdr.itt, r2t->data_count); 220 221 /* the buffer description has been passed with the command */ 222 /* Send the command */ 223 error = iser_send_data_out(conn, task, &hdr); 224 if (error) { 225 r2t->datasn--; 226 goto iscsi_iser_task_xmit_unsol_data_exit; 227 } 228 r2t->sent += r2t->data_count; 229 iser_dbg("Need to send %d more as data-out PDUs\n", 230 r2t->data_length - r2t->sent); 231 } 232 233 iscsi_iser_task_xmit_unsol_data_exit: 234 return error; 235 } 236 237 static int 238 iscsi_iser_task_xmit(struct iscsi_task *task) 239 { 240 struct iscsi_conn *conn = task->conn; 241 struct iscsi_iser_task *iser_task = task->dd_data; 242 int error = 0; 243 244 if (!task->sc) 245 return iscsi_iser_mtask_xmit(conn, task); 246 247 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 248 BUG_ON(scsi_bufflen(task->sc) == 0); 249 250 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 251 task->itt, scsi_bufflen(task->sc), 252 task->imm_count, task->unsol_r2t.data_length); 253 } 254 255 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 256 conn->id, task->itt); 257 258 /* Send the cmd PDU */ 259 if (!iser_task->command_sent) { 260 error = iser_send_command(conn, task); 261 if (error) 262 goto iscsi_iser_task_xmit_exit; 263 iser_task->command_sent = 1; 264 } 265 266 /* Send unsolicited data-out PDU(s) if necessary */ 267 if (iscsi_task_has_unsol_data(task)) 268 error = iscsi_iser_task_xmit_unsol_data(conn, task); 269 270 iscsi_iser_task_xmit_exit: 271 return error; 272 } 273 274 static void iscsi_iser_cleanup_task(struct iscsi_task *task) 275 { 276 struct iscsi_iser_task *iser_task = task->dd_data; 277 278 /* mgmt tasks do not need special cleanup */ 279 if (!task->sc) 280 return; 281 282 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 283 iser_task->status = ISER_TASK_STATUS_COMPLETED; 284 iser_task_rdma_finalize(iser_task); 285 } 286 } 287 288 static struct iscsi_cls_conn * 289 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 290 { 291 struct iscsi_conn *conn; 292 struct iscsi_cls_conn *cls_conn; 293 struct iscsi_iser_conn *iser_conn; 294 295 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 296 if (!cls_conn) 297 return NULL; 298 conn = cls_conn->dd_data; 299 300 /* 301 * due to issues with the login code re iser sematics 302 * this not set in iscsi_conn_setup - FIXME 303 */ 304 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 305 306 iser_conn = conn->dd_data; 307 conn->dd_data = iser_conn; 308 iser_conn->iscsi_conn = conn; 309 310 return cls_conn; 311 } 312 313 static void 314 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 315 { 316 struct iscsi_conn *conn = cls_conn->dd_data; 317 struct iscsi_iser_conn *iser_conn = conn->dd_data; 318 struct iser_conn *ib_conn = iser_conn->ib_conn; 319 320 iscsi_conn_teardown(cls_conn); 321 /* 322 * Userspace will normally call the stop callback and 323 * already have freed the ib_conn, but if it goofed up then 324 * we free it here. 325 */ 326 if (ib_conn) { 327 ib_conn->iser_conn = NULL; 328 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 329 } 330 } 331 332 static int 333 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 334 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 335 int is_leading) 336 { 337 struct iscsi_conn *conn = cls_conn->dd_data; 338 struct iscsi_iser_conn *iser_conn; 339 struct iser_conn *ib_conn; 340 struct iscsi_endpoint *ep; 341 int error; 342 343 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 344 if (error) 345 return error; 346 347 /* the transport ep handle comes from user space so it must be 348 * verified against the global ib connections list */ 349 ep = iscsi_lookup_endpoint(transport_eph); 350 if (!ep) { 351 iser_err("can't bind eph %llx\n", 352 (unsigned long long)transport_eph); 353 return -EINVAL; 354 } 355 ib_conn = ep->dd_data; 356 357 /* binds the iSER connection retrieved from the previously 358 * connected ep_handle to the iSCSI layer connection. exchanges 359 * connection pointers */ 360 iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n", 361 conn, conn->dd_data, ib_conn); 362 iser_conn = conn->dd_data; 363 ib_conn->iser_conn = iser_conn; 364 iser_conn->ib_conn = ib_conn; 365 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 366 return 0; 367 } 368 369 static void 370 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 371 { 372 struct iscsi_conn *conn = cls_conn->dd_data; 373 struct iscsi_iser_conn *iser_conn = conn->dd_data; 374 struct iser_conn *ib_conn = iser_conn->ib_conn; 375 376 /* 377 * Userspace may have goofed up and not bound the connection or 378 * might have only partially setup the connection. 379 */ 380 if (ib_conn) { 381 iscsi_conn_stop(cls_conn, flag); 382 /* 383 * There is no unbind event so the stop callback 384 * must release the ref from the bind. 385 */ 386 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 387 } 388 iser_conn->ib_conn = NULL; 389 } 390 391 static int 392 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 393 { 394 struct iscsi_conn *conn = cls_conn->dd_data; 395 int err; 396 397 err = iser_conn_set_full_featured_mode(conn); 398 if (err) 399 return err; 400 401 return iscsi_conn_start(cls_conn); 402 } 403 404 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 405 { 406 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 407 408 iscsi_session_teardown(cls_session); 409 iscsi_host_remove(shost); 410 iscsi_host_free(shost); 411 } 412 413 static struct iscsi_cls_session * 414 iscsi_iser_session_create(struct iscsi_endpoint *ep, 415 uint16_t cmds_max, uint16_t qdepth, 416 uint32_t initial_cmdsn) 417 { 418 struct iscsi_cls_session *cls_session; 419 struct iscsi_session *session; 420 struct Scsi_Host *shost; 421 struct iser_conn *ib_conn; 422 423 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 424 if (!shost) 425 return NULL; 426 shost->transportt = iscsi_iser_scsi_transport; 427 shost->max_lun = iscsi_max_lun; 428 shost->max_id = 0; 429 shost->max_channel = 0; 430 shost->max_cmd_len = 16; 431 432 /* 433 * older userspace tools (before 2.0-870) did not pass us 434 * the leading conn's ep so this will be NULL; 435 */ 436 if (ep) 437 ib_conn = ep->dd_data; 438 439 if (iscsi_host_add(shost, 440 ep ? ib_conn->device->ib_device->dma_device : NULL)) 441 goto free_host; 442 443 /* 444 * we do not support setting can_queue cmd_per_lun from userspace yet 445 * because we preallocate so many resources 446 */ 447 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 448 ISCSI_DEF_XMIT_CMDS_MAX, 0, 449 sizeof(struct iscsi_iser_task), 450 initial_cmdsn, 0); 451 if (!cls_session) 452 goto remove_host; 453 session = cls_session->dd_data; 454 455 shost->can_queue = session->scsi_cmds_max; 456 return cls_session; 457 458 remove_host: 459 iscsi_host_remove(shost); 460 free_host: 461 iscsi_host_free(shost); 462 return NULL; 463 } 464 465 static int 466 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 467 enum iscsi_param param, char *buf, int buflen) 468 { 469 int value; 470 471 switch (param) { 472 case ISCSI_PARAM_MAX_RECV_DLENGTH: 473 /* TBD */ 474 break; 475 case ISCSI_PARAM_HDRDGST_EN: 476 sscanf(buf, "%d", &value); 477 if (value) { 478 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 479 return -EPROTO; 480 } 481 break; 482 case ISCSI_PARAM_DATADGST_EN: 483 sscanf(buf, "%d", &value); 484 if (value) { 485 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 486 return -EPROTO; 487 } 488 break; 489 case ISCSI_PARAM_IFMARKER_EN: 490 sscanf(buf, "%d", &value); 491 if (value) { 492 printk(KERN_ERR "IFMarker wasn't negotiated to No"); 493 return -EPROTO; 494 } 495 break; 496 case ISCSI_PARAM_OFMARKER_EN: 497 sscanf(buf, "%d", &value); 498 if (value) { 499 printk(KERN_ERR "OFMarker wasn't negotiated to No"); 500 return -EPROTO; 501 } 502 break; 503 default: 504 return iscsi_set_param(cls_conn, param, buf, buflen); 505 } 506 507 return 0; 508 } 509 510 static void 511 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 512 { 513 struct iscsi_conn *conn = cls_conn->dd_data; 514 515 stats->txdata_octets = conn->txdata_octets; 516 stats->rxdata_octets = conn->rxdata_octets; 517 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 518 stats->dataout_pdus = conn->dataout_pdus_cnt; 519 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 520 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 521 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 522 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 523 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 524 stats->custom_length = 4; 525 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 526 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 527 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 528 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 529 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 530 stats->custom[2].value = conn->eh_abort_cnt; 531 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 532 stats->custom[3].value = conn->fmr_unalign_cnt; 533 } 534 535 static struct iscsi_endpoint * 536 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 537 int non_blocking) 538 { 539 int err; 540 struct iser_conn *ib_conn; 541 struct iscsi_endpoint *ep; 542 543 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 544 if (!ep) 545 return ERR_PTR(-ENOMEM); 546 547 ib_conn = ep->dd_data; 548 ib_conn->ep = ep; 549 iser_conn_init(ib_conn); 550 551 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 552 non_blocking); 553 if (err) { 554 iscsi_destroy_endpoint(ep); 555 return ERR_PTR(err); 556 } 557 return ep; 558 } 559 560 static int 561 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 562 { 563 struct iser_conn *ib_conn; 564 int rc; 565 566 ib_conn = ep->dd_data; 567 rc = wait_event_interruptible_timeout(ib_conn->wait, 568 ib_conn->state == ISER_CONN_UP, 569 msecs_to_jiffies(timeout_ms)); 570 571 /* if conn establishment failed, return error code to iscsi */ 572 if (!rc && 573 (ib_conn->state == ISER_CONN_TERMINATING || 574 ib_conn->state == ISER_CONN_DOWN)) 575 rc = -1; 576 577 iser_err("ib conn %p rc = %d\n", ib_conn, rc); 578 579 if (rc > 0) 580 return 1; /* success, this is the equivalent of POLLOUT */ 581 else if (!rc) 582 return 0; /* timeout */ 583 else 584 return rc; /* signal */ 585 } 586 587 static void 588 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 589 { 590 struct iser_conn *ib_conn; 591 592 ib_conn = ep->dd_data; 593 if (ib_conn->iser_conn) 594 /* 595 * Must suspend xmit path if the ep is bound to the 596 * iscsi_conn, so we know we are not accessing the ib_conn 597 * when we free it. 598 * 599 * This may not be bound if the ep poll failed. 600 */ 601 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 602 603 604 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 605 iser_conn_terminate(ib_conn); 606 } 607 608 static struct scsi_host_template iscsi_iser_sht = { 609 .module = THIS_MODULE, 610 .name = "iSCSI Initiator over iSER, v." DRV_VER, 611 .queuecommand = iscsi_queuecommand, 612 .change_queue_depth = iscsi_change_queue_depth, 613 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 614 .max_sectors = 1024, 615 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 616 .eh_abort_handler = iscsi_eh_abort, 617 .eh_device_reset_handler= iscsi_eh_device_reset, 618 .eh_target_reset_handler = iscsi_eh_recover_target, 619 .target_alloc = iscsi_target_alloc, 620 .use_clustering = DISABLE_CLUSTERING, 621 .proc_name = "iscsi_iser", 622 .this_id = -1, 623 }; 624 625 static struct iscsi_transport iscsi_iser_transport = { 626 .owner = THIS_MODULE, 627 .name = "iser", 628 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 629 .param_mask = ISCSI_MAX_RECV_DLENGTH | 630 ISCSI_MAX_XMIT_DLENGTH | 631 ISCSI_HDRDGST_EN | 632 ISCSI_DATADGST_EN | 633 ISCSI_INITIAL_R2T_EN | 634 ISCSI_MAX_R2T | 635 ISCSI_IMM_DATA_EN | 636 ISCSI_FIRST_BURST | 637 ISCSI_MAX_BURST | 638 ISCSI_PDU_INORDER_EN | 639 ISCSI_DATASEQ_INORDER_EN | 640 ISCSI_EXP_STATSN | 641 ISCSI_PERSISTENT_PORT | 642 ISCSI_PERSISTENT_ADDRESS | 643 ISCSI_TARGET_NAME | ISCSI_TPGT | 644 ISCSI_USERNAME | ISCSI_PASSWORD | 645 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 646 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 647 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO | 648 ISCSI_PING_TMO | ISCSI_RECV_TMO | 649 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, 650 .host_param_mask = ISCSI_HOST_HWADDRESS | 651 ISCSI_HOST_NETDEV_NAME | 652 ISCSI_HOST_INITIATOR_NAME, 653 /* session management */ 654 .create_session = iscsi_iser_session_create, 655 .destroy_session = iscsi_iser_session_destroy, 656 /* connection management */ 657 .create_conn = iscsi_iser_conn_create, 658 .bind_conn = iscsi_iser_conn_bind, 659 .destroy_conn = iscsi_iser_conn_destroy, 660 .set_param = iscsi_iser_set_param, 661 .get_conn_param = iscsi_conn_get_param, 662 .get_session_param = iscsi_session_get_param, 663 .start_conn = iscsi_iser_conn_start, 664 .stop_conn = iscsi_iser_conn_stop, 665 /* iscsi host params */ 666 .get_host_param = iscsi_host_get_param, 667 .set_host_param = iscsi_host_set_param, 668 /* IO */ 669 .send_pdu = iscsi_conn_send_pdu, 670 .get_stats = iscsi_iser_conn_get_stats, 671 .init_task = iscsi_iser_task_init, 672 .xmit_task = iscsi_iser_task_xmit, 673 .cleanup_task = iscsi_iser_cleanup_task, 674 .alloc_pdu = iscsi_iser_pdu_alloc, 675 /* recovery */ 676 .session_recovery_timedout = iscsi_session_recovery_timedout, 677 678 .ep_connect = iscsi_iser_ep_connect, 679 .ep_poll = iscsi_iser_ep_poll, 680 .ep_disconnect = iscsi_iser_ep_disconnect 681 }; 682 683 static int __init iser_init(void) 684 { 685 int err; 686 687 iser_dbg("Starting iSER datamover...\n"); 688 689 if (iscsi_max_lun < 1) { 690 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 691 return -EINVAL; 692 } 693 694 memset(&ig, 0, sizeof(struct iser_global)); 695 696 ig.desc_cache = kmem_cache_create("iser_descriptors", 697 sizeof(struct iser_tx_desc), 698 0, SLAB_HWCACHE_ALIGN, 699 NULL); 700 if (ig.desc_cache == NULL) 701 return -ENOMEM; 702 703 /* device init is called only after the first addr resolution */ 704 mutex_init(&ig.device_list_mutex); 705 INIT_LIST_HEAD(&ig.device_list); 706 mutex_init(&ig.connlist_mutex); 707 INIT_LIST_HEAD(&ig.connlist); 708 709 iscsi_iser_scsi_transport = iscsi_register_transport( 710 &iscsi_iser_transport); 711 if (!iscsi_iser_scsi_transport) { 712 iser_err("iscsi_register_transport failed\n"); 713 err = -EINVAL; 714 goto register_transport_failure; 715 } 716 717 return 0; 718 719 register_transport_failure: 720 kmem_cache_destroy(ig.desc_cache); 721 722 return err; 723 } 724 725 static void __exit iser_exit(void) 726 { 727 iser_dbg("Removing iSER datamover...\n"); 728 iscsi_unregister_transport(&iscsi_iser_transport); 729 kmem_cache_destroy(ig.desc_cache); 730 } 731 732 module_init(iser_init); 733 module_exit(iser_exit); 734