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 #include <linux/module.h> 61 62 #include <net/sock.h> 63 64 #include <asm/uaccess.h> 65 66 #include <scsi/scsi_cmnd.h> 67 #include <scsi/scsi_device.h> 68 #include <scsi/scsi_eh.h> 69 #include <scsi/scsi_tcq.h> 70 #include <scsi/scsi_host.h> 71 #include <scsi/scsi.h> 72 #include <scsi/scsi_transport_iscsi.h> 73 74 #include "iscsi_iser.h" 75 76 static struct scsi_host_template iscsi_iser_sht; 77 static struct iscsi_transport iscsi_iser_transport; 78 static struct scsi_transport_template *iscsi_iser_scsi_transport; 79 80 static unsigned int iscsi_max_lun = 512; 81 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 82 83 int iser_debug_level = 0; 84 85 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 86 "v" DRV_VER " (" DRV_DATE ")"); 87 MODULE_LICENSE("Dual BSD/GPL"); 88 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 89 90 module_param_named(debug_level, iser_debug_level, int, 0644); 91 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 92 93 struct iser_global ig; 94 95 void 96 iscsi_iser_recv(struct iscsi_conn *conn, 97 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 98 { 99 int rc = 0; 100 int datalen; 101 int ahslen; 102 103 /* verify PDU length */ 104 datalen = ntoh24(hdr->dlength); 105 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 106 iser_err("wrong datalen %d (hdr), %d (IB)\n", 107 datalen, rx_data_len); 108 rc = ISCSI_ERR_DATALEN; 109 goto error; 110 } 111 112 if (datalen != rx_data_len) 113 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 114 datalen, rx_data_len); 115 116 /* read AHS */ 117 ahslen = hdr->hlength * 4; 118 119 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 120 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 121 goto error; 122 123 return; 124 error: 125 iscsi_conn_failure(conn, rc); 126 } 127 128 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 129 { 130 struct iscsi_iser_task *iser_task = task->dd_data; 131 132 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 133 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 134 return 0; 135 } 136 137 int iser_initialize_task_headers(struct iscsi_task *task, 138 struct iser_tx_desc *tx_desc) 139 { 140 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 141 struct iser_device *device = iser_conn->ib_conn->device; 142 struct iscsi_iser_task *iser_task = task->dd_data; 143 u64 dma_addr; 144 145 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 146 ISER_HEADERS_LEN, DMA_TO_DEVICE); 147 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 148 return -ENOMEM; 149 150 tx_desc->dma_addr = dma_addr; 151 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 152 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 153 tx_desc->tx_sg[0].lkey = device->mr->lkey; 154 155 iser_task->iser_conn = iser_conn; 156 return 0; 157 } 158 /** 159 * iscsi_iser_task_init - Initialize task 160 * @task: iscsi task 161 * 162 * Initialize the task for the scsi command or mgmt command. 163 */ 164 static int 165 iscsi_iser_task_init(struct iscsi_task *task) 166 { 167 struct iscsi_iser_task *iser_task = task->dd_data; 168 169 if (iser_initialize_task_headers(task, &iser_task->desc)) 170 return -ENOMEM; 171 172 /* mgmt task */ 173 if (!task->sc) 174 return 0; 175 176 iser_task->command_sent = 0; 177 iser_task_rdma_init(iser_task); 178 return 0; 179 } 180 181 /** 182 * iscsi_iser_mtask_xmit - xmit management(immediate) task 183 * @conn: iscsi connection 184 * @task: task management task 185 * 186 * Notes: 187 * The function can return -EAGAIN in which case caller must 188 * call it again later, or recover. '0' return code means successful 189 * xmit. 190 * 191 **/ 192 static int 193 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 194 { 195 int error = 0; 196 197 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 198 199 error = iser_send_control(conn, task); 200 201 /* since iser xmits control with zero copy, tasks can not be recycled 202 * right after sending them. 203 * The recycling scheme is based on whether a response is expected 204 * - if yes, the task is recycled at iscsi_complete_pdu 205 * - if no, the task is recycled at iser_snd_completion 206 */ 207 return error; 208 } 209 210 static int 211 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 212 struct iscsi_task *task) 213 { 214 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 215 struct iscsi_data hdr; 216 int error = 0; 217 218 /* Send data-out PDUs while there's still unsolicited data to send */ 219 while (iscsi_task_has_unsol_data(task)) { 220 iscsi_prep_data_out_pdu(task, r2t, &hdr); 221 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 222 hdr.itt, r2t->data_count); 223 224 /* the buffer description has been passed with the command */ 225 /* Send the command */ 226 error = iser_send_data_out(conn, task, &hdr); 227 if (error) { 228 r2t->datasn--; 229 goto iscsi_iser_task_xmit_unsol_data_exit; 230 } 231 r2t->sent += r2t->data_count; 232 iser_dbg("Need to send %d more as data-out PDUs\n", 233 r2t->data_length - r2t->sent); 234 } 235 236 iscsi_iser_task_xmit_unsol_data_exit: 237 return error; 238 } 239 240 static int 241 iscsi_iser_task_xmit(struct iscsi_task *task) 242 { 243 struct iscsi_conn *conn = task->conn; 244 struct iscsi_iser_task *iser_task = task->dd_data; 245 int error = 0; 246 247 if (!task->sc) 248 return iscsi_iser_mtask_xmit(conn, task); 249 250 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 251 BUG_ON(scsi_bufflen(task->sc) == 0); 252 253 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 254 task->itt, scsi_bufflen(task->sc), 255 task->imm_count, task->unsol_r2t.data_length); 256 } 257 258 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 259 conn->id, task->itt); 260 261 /* Send the cmd PDU */ 262 if (!iser_task->command_sent) { 263 error = iser_send_command(conn, task); 264 if (error) 265 goto iscsi_iser_task_xmit_exit; 266 iser_task->command_sent = 1; 267 } 268 269 /* Send unsolicited data-out PDU(s) if necessary */ 270 if (iscsi_task_has_unsol_data(task)) 271 error = iscsi_iser_task_xmit_unsol_data(conn, task); 272 273 iscsi_iser_task_xmit_exit: 274 return error; 275 } 276 277 static void iscsi_iser_cleanup_task(struct iscsi_task *task) 278 { 279 struct iscsi_iser_task *iser_task = task->dd_data; 280 struct iser_tx_desc *tx_desc = &iser_task->desc; 281 282 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 283 struct iser_device *device = iser_conn->ib_conn->device; 284 285 ib_dma_unmap_single(device->ib_device, 286 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 287 288 /* mgmt tasks do not need special cleanup */ 289 if (!task->sc) 290 return; 291 292 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 293 iser_task->status = ISER_TASK_STATUS_COMPLETED; 294 iser_task_rdma_finalize(iser_task); 295 } 296 } 297 298 static struct iscsi_cls_conn * 299 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 300 { 301 struct iscsi_conn *conn; 302 struct iscsi_cls_conn *cls_conn; 303 struct iscsi_iser_conn *iser_conn; 304 305 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 306 if (!cls_conn) 307 return NULL; 308 conn = cls_conn->dd_data; 309 310 /* 311 * due to issues with the login code re iser sematics 312 * this not set in iscsi_conn_setup - FIXME 313 */ 314 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 315 316 iser_conn = conn->dd_data; 317 conn->dd_data = iser_conn; 318 iser_conn->iscsi_conn = conn; 319 320 return cls_conn; 321 } 322 323 static void 324 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 325 { 326 struct iscsi_conn *conn = cls_conn->dd_data; 327 struct iscsi_iser_conn *iser_conn = conn->dd_data; 328 struct iser_conn *ib_conn = iser_conn->ib_conn; 329 330 iscsi_conn_teardown(cls_conn); 331 /* 332 * Userspace will normally call the stop callback and 333 * already have freed the ib_conn, but if it goofed up then 334 * we free it here. 335 */ 336 if (ib_conn) { 337 ib_conn->iser_conn = NULL; 338 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 339 } 340 } 341 342 static int 343 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 344 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 345 int is_leading) 346 { 347 struct iscsi_conn *conn = cls_conn->dd_data; 348 struct iscsi_iser_conn *iser_conn; 349 struct iser_conn *ib_conn; 350 struct iscsi_endpoint *ep; 351 int error; 352 353 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 354 if (error) 355 return error; 356 357 /* the transport ep handle comes from user space so it must be 358 * verified against the global ib connections list */ 359 ep = iscsi_lookup_endpoint(transport_eph); 360 if (!ep) { 361 iser_err("can't bind eph %llx\n", 362 (unsigned long long)transport_eph); 363 return -EINVAL; 364 } 365 ib_conn = ep->dd_data; 366 367 if (iser_alloc_rx_descriptors(ib_conn)) 368 return -ENOMEM; 369 370 /* binds the iSER connection retrieved from the previously 371 * connected ep_handle to the iSCSI layer connection. exchanges 372 * connection pointers */ 373 iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n", 374 conn, conn->dd_data, ib_conn); 375 iser_conn = conn->dd_data; 376 ib_conn->iser_conn = iser_conn; 377 iser_conn->ib_conn = ib_conn; 378 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 379 return 0; 380 } 381 382 static void 383 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 384 { 385 struct iscsi_conn *conn = cls_conn->dd_data; 386 struct iscsi_iser_conn *iser_conn = conn->dd_data; 387 struct iser_conn *ib_conn = iser_conn->ib_conn; 388 389 /* 390 * Userspace may have goofed up and not bound the connection or 391 * might have only partially setup the connection. 392 */ 393 if (ib_conn) { 394 iscsi_conn_stop(cls_conn, flag); 395 /* 396 * There is no unbind event so the stop callback 397 * must release the ref from the bind. 398 */ 399 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 400 } 401 iser_conn->ib_conn = NULL; 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 int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 536 enum iscsi_param param, char *buf) 537 { 538 struct iser_conn *ib_conn = ep->dd_data; 539 int len; 540 541 switch (param) { 542 case ISCSI_PARAM_CONN_PORT: 543 case ISCSI_PARAM_CONN_ADDRESS: 544 if (!ib_conn || !ib_conn->cma_id) 545 return -ENOTCONN; 546 547 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 548 &ib_conn->cma_id->route.addr.dst_addr, 549 param, buf); 550 break; 551 default: 552 return -ENOSYS; 553 } 554 555 return len; 556 } 557 558 static struct iscsi_endpoint * 559 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 560 int non_blocking) 561 { 562 int err; 563 struct iser_conn *ib_conn; 564 struct iscsi_endpoint *ep; 565 566 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 567 if (!ep) 568 return ERR_PTR(-ENOMEM); 569 570 ib_conn = ep->dd_data; 571 ib_conn->ep = ep; 572 iser_conn_init(ib_conn); 573 574 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 575 non_blocking); 576 if (err) { 577 iscsi_destroy_endpoint(ep); 578 return ERR_PTR(err); 579 } 580 return ep; 581 } 582 583 static int 584 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 585 { 586 struct iser_conn *ib_conn; 587 int rc; 588 589 ib_conn = ep->dd_data; 590 rc = wait_event_interruptible_timeout(ib_conn->wait, 591 ib_conn->state == ISER_CONN_UP, 592 msecs_to_jiffies(timeout_ms)); 593 594 /* if conn establishment failed, return error code to iscsi */ 595 if (!rc && 596 (ib_conn->state == ISER_CONN_TERMINATING || 597 ib_conn->state == ISER_CONN_DOWN)) 598 rc = -1; 599 600 iser_err("ib conn %p rc = %d\n", ib_conn, rc); 601 602 if (rc > 0) 603 return 1; /* success, this is the equivalent of POLLOUT */ 604 else if (!rc) 605 return 0; /* timeout */ 606 else 607 return rc; /* signal */ 608 } 609 610 static void 611 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 612 { 613 struct iser_conn *ib_conn; 614 615 ib_conn = ep->dd_data; 616 if (ib_conn->iser_conn) 617 /* 618 * Must suspend xmit path if the ep is bound to the 619 * iscsi_conn, so we know we are not accessing the ib_conn 620 * when we free it. 621 * 622 * This may not be bound if the ep poll failed. 623 */ 624 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 625 626 627 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 628 iser_conn_terminate(ib_conn); 629 } 630 631 static umode_t iser_attr_is_visible(int param_type, int param) 632 { 633 switch (param_type) { 634 case ISCSI_HOST_PARAM: 635 switch (param) { 636 case ISCSI_HOST_PARAM_NETDEV_NAME: 637 case ISCSI_HOST_PARAM_HWADDRESS: 638 case ISCSI_HOST_PARAM_INITIATOR_NAME: 639 return S_IRUGO; 640 default: 641 return 0; 642 } 643 case ISCSI_PARAM: 644 switch (param) { 645 case ISCSI_PARAM_MAX_RECV_DLENGTH: 646 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 647 case ISCSI_PARAM_HDRDGST_EN: 648 case ISCSI_PARAM_DATADGST_EN: 649 case ISCSI_PARAM_CONN_ADDRESS: 650 case ISCSI_PARAM_CONN_PORT: 651 case ISCSI_PARAM_EXP_STATSN: 652 case ISCSI_PARAM_PERSISTENT_ADDRESS: 653 case ISCSI_PARAM_PERSISTENT_PORT: 654 case ISCSI_PARAM_PING_TMO: 655 case ISCSI_PARAM_RECV_TMO: 656 case ISCSI_PARAM_INITIAL_R2T_EN: 657 case ISCSI_PARAM_MAX_R2T: 658 case ISCSI_PARAM_IMM_DATA_EN: 659 case ISCSI_PARAM_FIRST_BURST: 660 case ISCSI_PARAM_MAX_BURST: 661 case ISCSI_PARAM_PDU_INORDER_EN: 662 case ISCSI_PARAM_DATASEQ_INORDER_EN: 663 case ISCSI_PARAM_TARGET_NAME: 664 case ISCSI_PARAM_TPGT: 665 case ISCSI_PARAM_USERNAME: 666 case ISCSI_PARAM_PASSWORD: 667 case ISCSI_PARAM_USERNAME_IN: 668 case ISCSI_PARAM_PASSWORD_IN: 669 case ISCSI_PARAM_FAST_ABORT: 670 case ISCSI_PARAM_ABORT_TMO: 671 case ISCSI_PARAM_LU_RESET_TMO: 672 case ISCSI_PARAM_TGT_RESET_TMO: 673 case ISCSI_PARAM_IFACE_NAME: 674 case ISCSI_PARAM_INITIATOR_NAME: 675 return S_IRUGO; 676 default: 677 return 0; 678 } 679 } 680 681 return 0; 682 } 683 684 static struct scsi_host_template iscsi_iser_sht = { 685 .module = THIS_MODULE, 686 .name = "iSCSI Initiator over iSER, v." DRV_VER, 687 .queuecommand = iscsi_queuecommand, 688 .change_queue_depth = iscsi_change_queue_depth, 689 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 690 .max_sectors = 1024, 691 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 692 .eh_abort_handler = iscsi_eh_abort, 693 .eh_device_reset_handler= iscsi_eh_device_reset, 694 .eh_target_reset_handler = iscsi_eh_recover_target, 695 .target_alloc = iscsi_target_alloc, 696 .use_clustering = DISABLE_CLUSTERING, 697 .proc_name = "iscsi_iser", 698 .this_id = -1, 699 }; 700 701 static struct iscsi_transport iscsi_iser_transport = { 702 .owner = THIS_MODULE, 703 .name = "iser", 704 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 705 /* session management */ 706 .create_session = iscsi_iser_session_create, 707 .destroy_session = iscsi_iser_session_destroy, 708 /* connection management */ 709 .create_conn = iscsi_iser_conn_create, 710 .bind_conn = iscsi_iser_conn_bind, 711 .destroy_conn = iscsi_iser_conn_destroy, 712 .attr_is_visible = iser_attr_is_visible, 713 .set_param = iscsi_iser_set_param, 714 .get_conn_param = iscsi_conn_get_param, 715 .get_ep_param = iscsi_iser_get_ep_param, 716 .get_session_param = iscsi_session_get_param, 717 .start_conn = iscsi_conn_start, 718 .stop_conn = iscsi_iser_conn_stop, 719 /* iscsi host params */ 720 .get_host_param = iscsi_host_get_param, 721 .set_host_param = iscsi_host_set_param, 722 /* IO */ 723 .send_pdu = iscsi_conn_send_pdu, 724 .get_stats = iscsi_iser_conn_get_stats, 725 .init_task = iscsi_iser_task_init, 726 .xmit_task = iscsi_iser_task_xmit, 727 .cleanup_task = iscsi_iser_cleanup_task, 728 .alloc_pdu = iscsi_iser_pdu_alloc, 729 /* recovery */ 730 .session_recovery_timedout = iscsi_session_recovery_timedout, 731 732 .ep_connect = iscsi_iser_ep_connect, 733 .ep_poll = iscsi_iser_ep_poll, 734 .ep_disconnect = iscsi_iser_ep_disconnect 735 }; 736 737 static int __init iser_init(void) 738 { 739 int err; 740 741 iser_dbg("Starting iSER datamover...\n"); 742 743 if (iscsi_max_lun < 1) { 744 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 745 return -EINVAL; 746 } 747 748 memset(&ig, 0, sizeof(struct iser_global)); 749 750 ig.desc_cache = kmem_cache_create("iser_descriptors", 751 sizeof(struct iser_tx_desc), 752 0, SLAB_HWCACHE_ALIGN, 753 NULL); 754 if (ig.desc_cache == NULL) 755 return -ENOMEM; 756 757 /* device init is called only after the first addr resolution */ 758 mutex_init(&ig.device_list_mutex); 759 INIT_LIST_HEAD(&ig.device_list); 760 mutex_init(&ig.connlist_mutex); 761 INIT_LIST_HEAD(&ig.connlist); 762 763 iscsi_iser_scsi_transport = iscsi_register_transport( 764 &iscsi_iser_transport); 765 if (!iscsi_iser_scsi_transport) { 766 iser_err("iscsi_register_transport failed\n"); 767 err = -EINVAL; 768 goto register_transport_failure; 769 } 770 771 return 0; 772 773 register_transport_failure: 774 kmem_cache_destroy(ig.desc_cache); 775 776 return err; 777 } 778 779 static void __exit iser_exit(void) 780 { 781 iser_dbg("Removing iSER datamover...\n"); 782 iscsi_unregister_transport(&iscsi_iser_transport); 783 kmem_cache_destroy(ig.desc_cache); 784 } 785 786 module_init(iser_init); 787 module_exit(iser_exit); 788