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 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. 9 * maintained by openib-general@openib.org 10 * 11 * This software is available to you under a choice of one of two 12 * licenses. You may choose to be licensed under the terms of the GNU 13 * General Public License (GPL) Version 2, available from the file 14 * COPYING in the main directory of this source tree, or the 15 * OpenIB.org BSD license below: 16 * 17 * Redistribution and use in source and binary forms, with or 18 * without modification, are permitted provided that the following 19 * conditions are met: 20 * 21 * - Redistributions of source code must retain the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer. 24 * 25 * - Redistributions in binary form must reproduce the above 26 * copyright notice, this list of conditions and the following 27 * disclaimer in the documentation and/or other materials 28 * provided with the distribution. 29 * 30 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 31 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 32 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 33 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 34 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 36 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 37 * SOFTWARE. 38 * 39 * Credits: 40 * Christoph Hellwig 41 * FUJITA Tomonori 42 * Arne Redlich 43 * Zhenyu Wang 44 * Modified by: 45 * Erez Zilber 46 */ 47 48 #include <linux/types.h> 49 #include <linux/list.h> 50 #include <linux/hardirq.h> 51 #include <linux/kfifo.h> 52 #include <linux/blkdev.h> 53 #include <linux/init.h> 54 #include <linux/ioctl.h> 55 #include <linux/cdev.h> 56 #include <linux/in.h> 57 #include <linux/net.h> 58 #include <linux/scatterlist.h> 59 #include <linux/delay.h> 60 #include <linux/slab.h> 61 #include <linux/module.h> 62 63 #include <net/sock.h> 64 65 #include <asm/uaccess.h> 66 67 #include <scsi/scsi_cmnd.h> 68 #include <scsi/scsi_device.h> 69 #include <scsi/scsi_eh.h> 70 #include <scsi/scsi_tcq.h> 71 #include <scsi/scsi_host.h> 72 #include <scsi/scsi.h> 73 #include <scsi/scsi_transport_iscsi.h> 74 75 #include "iscsi_iser.h" 76 77 static struct scsi_host_template iscsi_iser_sht; 78 static struct iscsi_transport iscsi_iser_transport; 79 static struct scsi_transport_template *iscsi_iser_scsi_transport; 80 81 static unsigned int iscsi_max_lun = 512; 82 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 83 84 int iser_debug_level = 0; 85 bool iser_pi_enable = false; 86 int iser_pi_guard = 1; 87 88 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); 89 MODULE_LICENSE("Dual BSD/GPL"); 90 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 91 MODULE_VERSION(DRV_VER); 92 93 module_param_named(debug_level, iser_debug_level, int, 0644); 94 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 95 96 module_param_named(pi_enable, iser_pi_enable, bool, 0644); 97 MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); 98 99 module_param_named(pi_guard, iser_pi_guard, int, 0644); 100 MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:IP_CSUM)"); 101 102 static struct workqueue_struct *release_wq; 103 struct iser_global ig; 104 105 /* 106 * iscsi_iser_recv() - Process a successfull recv completion 107 * @conn: iscsi connection 108 * @hdr: iscsi header 109 * @rx_data: buffer containing receive data payload 110 * @rx_data_len: length of rx_data 111 * 112 * Notes: In case of data length errors or iscsi PDU completion failures 113 * this routine will signal iscsi layer of connection failure. 114 */ 115 void 116 iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 117 char *rx_data, int rx_data_len) 118 { 119 int rc = 0; 120 int datalen; 121 int ahslen; 122 123 /* verify PDU length */ 124 datalen = ntoh24(hdr->dlength); 125 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 126 iser_err("wrong datalen %d (hdr), %d (IB)\n", 127 datalen, rx_data_len); 128 rc = ISCSI_ERR_DATALEN; 129 goto error; 130 } 131 132 if (datalen != rx_data_len) 133 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 134 datalen, rx_data_len); 135 136 /* read AHS */ 137 ahslen = hdr->hlength * 4; 138 139 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 140 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 141 goto error; 142 143 return; 144 error: 145 iscsi_conn_failure(conn, rc); 146 } 147 148 /** 149 * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU 150 * @task: iscsi task 151 * @opcode: iscsi command opcode 152 * 153 * Netes: This routine can't fail, just assign iscsi task 154 * hdr and max hdr size. 155 */ 156 static int 157 iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 158 { 159 struct iscsi_iser_task *iser_task = task->dd_data; 160 161 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 162 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 163 164 return 0; 165 } 166 167 int iser_initialize_task_headers(struct iscsi_task *task, 168 struct iser_tx_desc *tx_desc) 169 { 170 struct iser_conn *iser_conn = task->conn->dd_data; 171 struct iser_device *device = iser_conn->ib_conn.device; 172 struct iscsi_iser_task *iser_task = task->dd_data; 173 u64 dma_addr; 174 175 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 176 ISER_HEADERS_LEN, DMA_TO_DEVICE); 177 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 178 return -ENOMEM; 179 180 tx_desc->dma_addr = dma_addr; 181 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 182 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 183 tx_desc->tx_sg[0].lkey = device->mr->lkey; 184 185 iser_task->iser_conn = iser_conn; 186 return 0; 187 } 188 189 /** 190 * iscsi_iser_task_init() - Initialize iscsi-iser task 191 * @task: iscsi task 192 * 193 * Initialize the task for the scsi command or mgmt command. 194 * 195 * Return: Returns zero on success or -ENOMEM when failing 196 * to init task headers (dma mapping error). 197 */ 198 static int 199 iscsi_iser_task_init(struct iscsi_task *task) 200 { 201 struct iscsi_iser_task *iser_task = task->dd_data; 202 203 if (iser_initialize_task_headers(task, &iser_task->desc)) 204 return -ENOMEM; 205 206 /* mgmt task */ 207 if (!task->sc) 208 return 0; 209 210 iser_task->command_sent = 0; 211 iser_task_rdma_init(iser_task); 212 iser_task->sc = task->sc; 213 214 return 0; 215 } 216 217 /** 218 * iscsi_iser_mtask_xmit() - xmit management (immediate) task 219 * @conn: iscsi connection 220 * @task: task management task 221 * 222 * Notes: 223 * The function can return -EAGAIN in which case caller must 224 * call it again later, or recover. '0' return code means successful 225 * xmit. 226 * 227 **/ 228 static int 229 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 230 { 231 int error = 0; 232 233 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 234 235 error = iser_send_control(conn, task); 236 237 /* since iser xmits control with zero copy, tasks can not be recycled 238 * right after sending them. 239 * The recycling scheme is based on whether a response is expected 240 * - if yes, the task is recycled at iscsi_complete_pdu 241 * - if no, the task is recycled at iser_snd_completion 242 */ 243 return error; 244 } 245 246 static int 247 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 248 struct iscsi_task *task) 249 { 250 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 251 struct iscsi_data hdr; 252 int error = 0; 253 254 /* Send data-out PDUs while there's still unsolicited data to send */ 255 while (iscsi_task_has_unsol_data(task)) { 256 iscsi_prep_data_out_pdu(task, r2t, &hdr); 257 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 258 hdr.itt, r2t->data_count); 259 260 /* the buffer description has been passed with the command */ 261 /* Send the command */ 262 error = iser_send_data_out(conn, task, &hdr); 263 if (error) { 264 r2t->datasn--; 265 goto iscsi_iser_task_xmit_unsol_data_exit; 266 } 267 r2t->sent += r2t->data_count; 268 iser_dbg("Need to send %d more as data-out PDUs\n", 269 r2t->data_length - r2t->sent); 270 } 271 272 iscsi_iser_task_xmit_unsol_data_exit: 273 return error; 274 } 275 276 /** 277 * iscsi_iser_task_xmit() - xmit iscsi-iser task 278 * @task: iscsi task 279 * 280 * Return: zero on success or escalates $error on failure. 281 */ 282 static int 283 iscsi_iser_task_xmit(struct iscsi_task *task) 284 { 285 struct iscsi_conn *conn = task->conn; 286 struct iscsi_iser_task *iser_task = task->dd_data; 287 int error = 0; 288 289 if (!task->sc) 290 return iscsi_iser_mtask_xmit(conn, task); 291 292 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 293 BUG_ON(scsi_bufflen(task->sc) == 0); 294 295 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 296 task->itt, scsi_bufflen(task->sc), 297 task->imm_count, task->unsol_r2t.data_length); 298 } 299 300 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 301 conn->id, task->itt); 302 303 /* Send the cmd PDU */ 304 if (!iser_task->command_sent) { 305 error = iser_send_command(conn, task); 306 if (error) 307 goto iscsi_iser_task_xmit_exit; 308 iser_task->command_sent = 1; 309 } 310 311 /* Send unsolicited data-out PDU(s) if necessary */ 312 if (iscsi_task_has_unsol_data(task)) 313 error = iscsi_iser_task_xmit_unsol_data(conn, task); 314 315 iscsi_iser_task_xmit_exit: 316 return error; 317 } 318 319 /** 320 * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task 321 * @task: iscsi task 322 * 323 * Notes: In case the RDMA device is already NULL (might have 324 * been removed in DEVICE_REMOVAL CM event it will bail-out 325 * without doing dma unmapping. 326 */ 327 static void iscsi_iser_cleanup_task(struct iscsi_task *task) 328 { 329 struct iscsi_iser_task *iser_task = task->dd_data; 330 struct iser_tx_desc *tx_desc = &iser_task->desc; 331 struct iser_conn *iser_conn = task->conn->dd_data; 332 struct iser_device *device = iser_conn->ib_conn.device; 333 334 /* DEVICE_REMOVAL event might have already released the device */ 335 if (!device) 336 return; 337 338 ib_dma_unmap_single(device->ib_device, 339 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 340 341 /* mgmt tasks do not need special cleanup */ 342 if (!task->sc) 343 return; 344 345 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 346 iser_task->status = ISER_TASK_STATUS_COMPLETED; 347 iser_task_rdma_finalize(iser_task); 348 } 349 } 350 351 /** 352 * iscsi_iser_check_protection() - check protection information status of task. 353 * @task: iscsi task 354 * @sector: error sector if exsists (output) 355 * 356 * Return: zero if no data-integrity errors have occured 357 * 0x1: data-integrity error occured in the guard-block 358 * 0x2: data-integrity error occured in the reference tag 359 * 0x3: data-integrity error occured in the application tag 360 * 361 * In addition the error sector is marked. 362 */ 363 static u8 364 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 365 { 366 struct iscsi_iser_task *iser_task = task->dd_data; 367 368 if (iser_task->dir[ISER_DIR_IN]) 369 return iser_check_task_pi_status(iser_task, ISER_DIR_IN, 370 sector); 371 else 372 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, 373 sector); 374 } 375 376 /** 377 * iscsi_iser_conn_create() - create a new iscsi-iser connection 378 * @cls_session: iscsi class connection 379 * @conn_idx: connection index within the session (for MCS) 380 * 381 * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL 382 * otherwise. 383 */ 384 static struct iscsi_cls_conn * 385 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, 386 uint32_t conn_idx) 387 { 388 struct iscsi_conn *conn; 389 struct iscsi_cls_conn *cls_conn; 390 391 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 392 if (!cls_conn) 393 return NULL; 394 conn = cls_conn->dd_data; 395 396 /* 397 * due to issues with the login code re iser sematics 398 * this not set in iscsi_conn_setup - FIXME 399 */ 400 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 401 402 return cls_conn; 403 } 404 405 /** 406 * iscsi_iser_conn_bind() - bind iscsi and iser connection structures 407 * @cls_session: iscsi class session 408 * @cls_conn: iscsi class connection 409 * @transport_eph: transport end-point handle 410 * @is_leading: indicate if this is the session leading connection (MCS) 411 * 412 * Return: zero on success, $error if iscsi_conn_bind fails and 413 * -EINVAL in case end-point doesn't exsits anymore or iser connection 414 * state is not UP (teardown already started). 415 */ 416 static int 417 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 418 struct iscsi_cls_conn *cls_conn, 419 uint64_t transport_eph, 420 int is_leading) 421 { 422 struct iscsi_conn *conn = cls_conn->dd_data; 423 struct iser_conn *iser_conn; 424 struct iscsi_endpoint *ep; 425 int error; 426 427 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 428 if (error) 429 return error; 430 431 /* the transport ep handle comes from user space so it must be 432 * verified against the global ib connections list */ 433 ep = iscsi_lookup_endpoint(transport_eph); 434 if (!ep) { 435 iser_err("can't bind eph %llx\n", 436 (unsigned long long)transport_eph); 437 return -EINVAL; 438 } 439 iser_conn = ep->dd_data; 440 441 mutex_lock(&iser_conn->state_mutex); 442 if (iser_conn->state != ISER_CONN_UP) { 443 error = -EINVAL; 444 iser_err("iser_conn %p state is %d, teardown started\n", 445 iser_conn, iser_conn->state); 446 goto out; 447 } 448 449 error = iser_alloc_rx_descriptors(iser_conn, conn->session); 450 if (error) 451 goto out; 452 453 /* binds the iSER connection retrieved from the previously 454 * connected ep_handle to the iSCSI layer connection. exchanges 455 * connection pointers */ 456 iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); 457 458 conn->dd_data = iser_conn; 459 iser_conn->iscsi_conn = conn; 460 461 out: 462 mutex_unlock(&iser_conn->state_mutex); 463 return error; 464 } 465 466 /** 467 * iscsi_iser_conn_start() - start iscsi-iser connection 468 * @cls_conn: iscsi class connection 469 * 470 * Notes: Here iser intialize (or re-initialize) stop_completion as 471 * from this point iscsi must call conn_stop in session/connection 472 * teardown so iser transport must wait for it. 473 */ 474 static int 475 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 476 { 477 struct iscsi_conn *iscsi_conn; 478 struct iser_conn *iser_conn; 479 480 iscsi_conn = cls_conn->dd_data; 481 iser_conn = iscsi_conn->dd_data; 482 reinit_completion(&iser_conn->stop_completion); 483 484 return iscsi_conn_start(cls_conn); 485 } 486 487 /** 488 * iscsi_iser_conn_stop() - stop iscsi-iser connection 489 * @cls_conn: iscsi class connection 490 * @flag: indicate if recover or terminate (passed as is) 491 * 492 * Notes: Calling iscsi_conn_stop might theoretically race with 493 * DEVICE_REMOVAL event and dereference a previously freed RDMA device 494 * handle, so we call it under iser the state lock to protect against 495 * this kind of race. 496 */ 497 static void 498 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 499 { 500 struct iscsi_conn *conn = cls_conn->dd_data; 501 struct iser_conn *iser_conn = conn->dd_data; 502 503 iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); 504 505 /* 506 * Userspace may have goofed up and not bound the connection or 507 * might have only partially setup the connection. 508 */ 509 if (iser_conn) { 510 mutex_lock(&iser_conn->state_mutex); 511 iscsi_conn_stop(cls_conn, flag); 512 iser_conn_terminate(iser_conn); 513 514 /* unbind */ 515 iser_conn->iscsi_conn = NULL; 516 conn->dd_data = NULL; 517 518 complete(&iser_conn->stop_completion); 519 mutex_unlock(&iser_conn->state_mutex); 520 } else { 521 iscsi_conn_stop(cls_conn, flag); 522 } 523 } 524 525 /** 526 * iscsi_iser_session_destroy() - destroy iscsi-iser session 527 * @cls_session: iscsi class session 528 * 529 * Removes and free iscsi host. 530 */ 531 static void 532 iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 533 { 534 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 535 536 iscsi_session_teardown(cls_session); 537 iscsi_host_remove(shost); 538 iscsi_host_free(shost); 539 } 540 541 static inline unsigned int 542 iser_dif_prot_caps(int prot_caps) 543 { 544 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION | 545 SHOST_DIX_TYPE1_PROTECTION : 0) | 546 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION | 547 SHOST_DIX_TYPE2_PROTECTION : 0) | 548 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION | 549 SHOST_DIX_TYPE3_PROTECTION : 0); 550 } 551 552 /** 553 * iscsi_iser_session_create() - create an iscsi-iser session 554 * @ep: iscsi end-point handle 555 * @cmds_max: maximum commands in this session 556 * @qdepth: session command queue depth 557 * @initial_cmdsn: initiator command sequnce number 558 * 559 * Allocates and adds a scsi host, expose DIF supprot if 560 * exists, and sets up an iscsi session. 561 */ 562 static struct iscsi_cls_session * 563 iscsi_iser_session_create(struct iscsi_endpoint *ep, 564 uint16_t cmds_max, uint16_t qdepth, 565 uint32_t initial_cmdsn) 566 { 567 struct iscsi_cls_session *cls_session; 568 struct iscsi_session *session; 569 struct Scsi_Host *shost; 570 struct iser_conn *iser_conn = NULL; 571 struct ib_conn *ib_conn; 572 573 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 574 if (!shost) 575 return NULL; 576 shost->transportt = iscsi_iser_scsi_transport; 577 shost->cmd_per_lun = qdepth; 578 shost->max_lun = iscsi_max_lun; 579 shost->max_id = 0; 580 shost->max_channel = 0; 581 shost->max_cmd_len = 16; 582 583 /* 584 * older userspace tools (before 2.0-870) did not pass us 585 * the leading conn's ep so this will be NULL; 586 */ 587 if (ep) { 588 iser_conn = ep->dd_data; 589 ib_conn = &iser_conn->ib_conn; 590 if (ib_conn->pi_support) { 591 u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; 592 593 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 594 if (iser_pi_guard) 595 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 596 else 597 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); 598 } 599 } 600 601 if (iscsi_host_add(shost, ep ? 602 ib_conn->device->ib_device->dma_device : NULL)) 603 goto free_host; 604 605 if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) { 606 iser_info("cmds_max changed from %u to %u\n", 607 cmds_max, ISER_DEF_XMIT_CMDS_MAX); 608 cmds_max = ISER_DEF_XMIT_CMDS_MAX; 609 } 610 611 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 612 cmds_max, 0, 613 sizeof(struct iscsi_iser_task), 614 initial_cmdsn, 0); 615 if (!cls_session) 616 goto remove_host; 617 session = cls_session->dd_data; 618 619 shost->can_queue = session->scsi_cmds_max; 620 return cls_session; 621 622 remove_host: 623 iscsi_host_remove(shost); 624 free_host: 625 iscsi_host_free(shost); 626 return NULL; 627 } 628 629 static int 630 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 631 enum iscsi_param param, char *buf, int buflen) 632 { 633 int value; 634 635 switch (param) { 636 case ISCSI_PARAM_MAX_RECV_DLENGTH: 637 /* TBD */ 638 break; 639 case ISCSI_PARAM_HDRDGST_EN: 640 sscanf(buf, "%d", &value); 641 if (value) { 642 iser_err("DataDigest wasn't negotiated to None\n"); 643 return -EPROTO; 644 } 645 break; 646 case ISCSI_PARAM_DATADGST_EN: 647 sscanf(buf, "%d", &value); 648 if (value) { 649 iser_err("DataDigest wasn't negotiated to None\n"); 650 return -EPROTO; 651 } 652 break; 653 case ISCSI_PARAM_IFMARKER_EN: 654 sscanf(buf, "%d", &value); 655 if (value) { 656 iser_err("IFMarker wasn't negotiated to No\n"); 657 return -EPROTO; 658 } 659 break; 660 case ISCSI_PARAM_OFMARKER_EN: 661 sscanf(buf, "%d", &value); 662 if (value) { 663 iser_err("OFMarker wasn't negotiated to No\n"); 664 return -EPROTO; 665 } 666 break; 667 default: 668 return iscsi_set_param(cls_conn, param, buf, buflen); 669 } 670 671 return 0; 672 } 673 674 /** 675 * iscsi_iser_set_param() - set class connection parameter 676 * @cls_conn: iscsi class connection 677 * @stats: iscsi stats to output 678 * 679 * Output connection statistics. 680 */ 681 static void 682 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 683 { 684 struct iscsi_conn *conn = cls_conn->dd_data; 685 686 stats->txdata_octets = conn->txdata_octets; 687 stats->rxdata_octets = conn->rxdata_octets; 688 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 689 stats->dataout_pdus = conn->dataout_pdus_cnt; 690 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 691 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 692 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 693 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 694 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 695 stats->custom_length = 4; 696 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 697 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 698 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 699 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 700 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 701 stats->custom[2].value = conn->eh_abort_cnt; 702 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 703 stats->custom[3].value = conn->fmr_unalign_cnt; 704 } 705 706 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 707 enum iscsi_param param, char *buf) 708 { 709 struct iser_conn *iser_conn = ep->dd_data; 710 int len; 711 712 switch (param) { 713 case ISCSI_PARAM_CONN_PORT: 714 case ISCSI_PARAM_CONN_ADDRESS: 715 if (!iser_conn || !iser_conn->ib_conn.cma_id) 716 return -ENOTCONN; 717 718 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 719 &iser_conn->ib_conn.cma_id->route.addr.dst_addr, 720 param, buf); 721 break; 722 default: 723 return -ENOSYS; 724 } 725 726 return len; 727 } 728 729 /** 730 * iscsi_iser_ep_connect() - Initiate iSER connection establishment 731 * @shost: scsi_host 732 * @dst_addr: destination address 733 * @non-blocking: indicate if routine can block 734 * 735 * Allocate an iscsi endpoint, an iser_conn structure and bind them. 736 * After that start RDMA connection establishment via rdma_cm. We 737 * don't allocate iser_conn embedded in iscsi_endpoint since in teardown 738 * the endpoint will be destroyed at ep_disconnect while iser_conn will 739 * cleanup its resources asynchronuously. 740 * 741 * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) 742 * if fails. 743 */ 744 static struct iscsi_endpoint * 745 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 746 int non_blocking) 747 { 748 int err; 749 struct iser_conn *iser_conn; 750 struct iscsi_endpoint *ep; 751 752 ep = iscsi_create_endpoint(0); 753 if (!ep) 754 return ERR_PTR(-ENOMEM); 755 756 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); 757 if (!iser_conn) { 758 err = -ENOMEM; 759 goto failure; 760 } 761 762 ep->dd_data = iser_conn; 763 iser_conn->ep = ep; 764 iser_conn_init(iser_conn); 765 766 err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); 767 if (err) 768 goto failure; 769 770 return ep; 771 failure: 772 iscsi_destroy_endpoint(ep); 773 return ERR_PTR(err); 774 } 775 776 /** 777 * iscsi_iser_ep_poll() - poll for iser connection establishment to complete 778 * @ep: iscsi endpoint (created at ep_connect) 779 * @timeout_ms: polling timeout allowed in ms. 780 * 781 * This routine boils down to waiting for up_completion signaling 782 * that cma_id got CONNECTED event. 783 * 784 * Return: 1 if succeeded in connection establishment, 0 if timeout expired 785 * (libiscsi will retry will kick in) or -1 if interrupted by signal 786 * or more likely iser connection state transitioned to TEMINATING or 787 * DOWN during the wait period. 788 */ 789 static int 790 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 791 { 792 struct iser_conn *iser_conn; 793 int rc; 794 795 iser_conn = ep->dd_data; 796 rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, 797 msecs_to_jiffies(timeout_ms)); 798 /* if conn establishment failed, return error code to iscsi */ 799 if (rc == 0) { 800 mutex_lock(&iser_conn->state_mutex); 801 if (iser_conn->state == ISER_CONN_TERMINATING || 802 iser_conn->state == ISER_CONN_DOWN) 803 rc = -1; 804 mutex_unlock(&iser_conn->state_mutex); 805 } 806 807 iser_info("ib conn %p rc = %d\n", iser_conn, rc); 808 809 if (rc > 0) 810 return 1; /* success, this is the equivalent of POLLOUT */ 811 else if (!rc) 812 return 0; /* timeout */ 813 else 814 return rc; /* signal */ 815 } 816 817 /** 818 * iscsi_iser_ep_disconnect() - Initiate connection teardown process 819 * @ep: iscsi endpoint handle 820 * 821 * This routine is not blocked by iser and RDMA termination process 822 * completion as we queue a deffered work for iser/RDMA destruction 823 * and cleanup or actually call it immediately in case we didn't pass 824 * iscsi conn bind/start stage, thus it is safe. 825 */ 826 static void 827 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 828 { 829 struct iser_conn *iser_conn; 830 831 iser_conn = ep->dd_data; 832 iser_info("ep %p iser conn %p state %d\n", 833 ep, iser_conn, iser_conn->state); 834 835 mutex_lock(&iser_conn->state_mutex); 836 iser_conn_terminate(iser_conn); 837 838 /* 839 * if iser_conn and iscsi_conn are bound, we must wait for 840 * iscsi_conn_stop and flush errors completion before freeing 841 * the iser resources. Otherwise we are safe to free resources 842 * immediately. 843 */ 844 if (iser_conn->iscsi_conn) { 845 INIT_WORK(&iser_conn->release_work, iser_release_work); 846 queue_work(release_wq, &iser_conn->release_work); 847 mutex_unlock(&iser_conn->state_mutex); 848 } else { 849 iser_conn->state = ISER_CONN_DOWN; 850 mutex_unlock(&iser_conn->state_mutex); 851 iser_conn_release(iser_conn); 852 } 853 iscsi_destroy_endpoint(ep); 854 } 855 856 static umode_t iser_attr_is_visible(int param_type, int param) 857 { 858 switch (param_type) { 859 case ISCSI_HOST_PARAM: 860 switch (param) { 861 case ISCSI_HOST_PARAM_NETDEV_NAME: 862 case ISCSI_HOST_PARAM_HWADDRESS: 863 case ISCSI_HOST_PARAM_INITIATOR_NAME: 864 return S_IRUGO; 865 default: 866 return 0; 867 } 868 case ISCSI_PARAM: 869 switch (param) { 870 case ISCSI_PARAM_MAX_RECV_DLENGTH: 871 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 872 case ISCSI_PARAM_HDRDGST_EN: 873 case ISCSI_PARAM_DATADGST_EN: 874 case ISCSI_PARAM_CONN_ADDRESS: 875 case ISCSI_PARAM_CONN_PORT: 876 case ISCSI_PARAM_EXP_STATSN: 877 case ISCSI_PARAM_PERSISTENT_ADDRESS: 878 case ISCSI_PARAM_PERSISTENT_PORT: 879 case ISCSI_PARAM_PING_TMO: 880 case ISCSI_PARAM_RECV_TMO: 881 case ISCSI_PARAM_INITIAL_R2T_EN: 882 case ISCSI_PARAM_MAX_R2T: 883 case ISCSI_PARAM_IMM_DATA_EN: 884 case ISCSI_PARAM_FIRST_BURST: 885 case ISCSI_PARAM_MAX_BURST: 886 case ISCSI_PARAM_PDU_INORDER_EN: 887 case ISCSI_PARAM_DATASEQ_INORDER_EN: 888 case ISCSI_PARAM_TARGET_NAME: 889 case ISCSI_PARAM_TPGT: 890 case ISCSI_PARAM_USERNAME: 891 case ISCSI_PARAM_PASSWORD: 892 case ISCSI_PARAM_USERNAME_IN: 893 case ISCSI_PARAM_PASSWORD_IN: 894 case ISCSI_PARAM_FAST_ABORT: 895 case ISCSI_PARAM_ABORT_TMO: 896 case ISCSI_PARAM_LU_RESET_TMO: 897 case ISCSI_PARAM_TGT_RESET_TMO: 898 case ISCSI_PARAM_IFACE_NAME: 899 case ISCSI_PARAM_INITIATOR_NAME: 900 case ISCSI_PARAM_DISCOVERY_SESS: 901 return S_IRUGO; 902 default: 903 return 0; 904 } 905 } 906 907 return 0; 908 } 909 910 static struct scsi_host_template iscsi_iser_sht = { 911 .module = THIS_MODULE, 912 .name = "iSCSI Initiator over iSER", 913 .queuecommand = iscsi_queuecommand, 914 .change_queue_depth = iscsi_change_queue_depth, 915 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 916 .max_sectors = 1024, 917 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 918 .eh_abort_handler = iscsi_eh_abort, 919 .eh_device_reset_handler= iscsi_eh_device_reset, 920 .eh_target_reset_handler = iscsi_eh_recover_target, 921 .target_alloc = iscsi_target_alloc, 922 .use_clustering = DISABLE_CLUSTERING, 923 .proc_name = "iscsi_iser", 924 .this_id = -1, 925 }; 926 927 static struct iscsi_transport iscsi_iser_transport = { 928 .owner = THIS_MODULE, 929 .name = "iser", 930 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 931 /* session management */ 932 .create_session = iscsi_iser_session_create, 933 .destroy_session = iscsi_iser_session_destroy, 934 /* connection management */ 935 .create_conn = iscsi_iser_conn_create, 936 .bind_conn = iscsi_iser_conn_bind, 937 .destroy_conn = iscsi_conn_teardown, 938 .attr_is_visible = iser_attr_is_visible, 939 .set_param = iscsi_iser_set_param, 940 .get_conn_param = iscsi_conn_get_param, 941 .get_ep_param = iscsi_iser_get_ep_param, 942 .get_session_param = iscsi_session_get_param, 943 .start_conn = iscsi_iser_conn_start, 944 .stop_conn = iscsi_iser_conn_stop, 945 /* iscsi host params */ 946 .get_host_param = iscsi_host_get_param, 947 .set_host_param = iscsi_host_set_param, 948 /* IO */ 949 .send_pdu = iscsi_conn_send_pdu, 950 .get_stats = iscsi_iser_conn_get_stats, 951 .init_task = iscsi_iser_task_init, 952 .xmit_task = iscsi_iser_task_xmit, 953 .cleanup_task = iscsi_iser_cleanup_task, 954 .alloc_pdu = iscsi_iser_pdu_alloc, 955 .check_protection = iscsi_iser_check_protection, 956 /* recovery */ 957 .session_recovery_timedout = iscsi_session_recovery_timedout, 958 959 .ep_connect = iscsi_iser_ep_connect, 960 .ep_poll = iscsi_iser_ep_poll, 961 .ep_disconnect = iscsi_iser_ep_disconnect 962 }; 963 964 static int __init iser_init(void) 965 { 966 int err; 967 968 iser_dbg("Starting iSER datamover...\n"); 969 970 if (iscsi_max_lun < 1) { 971 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 972 return -EINVAL; 973 } 974 975 memset(&ig, 0, sizeof(struct iser_global)); 976 977 ig.desc_cache = kmem_cache_create("iser_descriptors", 978 sizeof(struct iser_tx_desc), 979 0, SLAB_HWCACHE_ALIGN, 980 NULL); 981 if (ig.desc_cache == NULL) 982 return -ENOMEM; 983 984 /* device init is called only after the first addr resolution */ 985 mutex_init(&ig.device_list_mutex); 986 INIT_LIST_HEAD(&ig.device_list); 987 mutex_init(&ig.connlist_mutex); 988 INIT_LIST_HEAD(&ig.connlist); 989 990 release_wq = alloc_workqueue("release workqueue", 0, 0); 991 if (!release_wq) { 992 iser_err("failed to allocate release workqueue\n"); 993 return -ENOMEM; 994 } 995 996 iscsi_iser_scsi_transport = iscsi_register_transport( 997 &iscsi_iser_transport); 998 if (!iscsi_iser_scsi_transport) { 999 iser_err("iscsi_register_transport failed\n"); 1000 err = -EINVAL; 1001 goto register_transport_failure; 1002 } 1003 1004 return 0; 1005 1006 register_transport_failure: 1007 kmem_cache_destroy(ig.desc_cache); 1008 1009 return err; 1010 } 1011 1012 static void __exit iser_exit(void) 1013 { 1014 struct iser_conn *iser_conn, *n; 1015 int connlist_empty; 1016 1017 iser_dbg("Removing iSER datamover...\n"); 1018 destroy_workqueue(release_wq); 1019 1020 mutex_lock(&ig.connlist_mutex); 1021 connlist_empty = list_empty(&ig.connlist); 1022 mutex_unlock(&ig.connlist_mutex); 1023 1024 if (!connlist_empty) { 1025 iser_err("Error cleanup stage completed but we still have iser " 1026 "connections, destroying them anyway.\n"); 1027 list_for_each_entry_safe(iser_conn, n, &ig.connlist, 1028 conn_list) { 1029 iser_conn_release(iser_conn); 1030 } 1031 } 1032 1033 iscsi_unregister_transport(&iscsi_iser_transport); 1034 kmem_cache_destroy(ig.desc_cache); 1035 } 1036 1037 module_init(iser_init); 1038 module_exit(iser_exit); 1039