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 <linux/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 77MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); 78MODULE_LICENSE("Dual BSD/GPL"); 79MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 80 81static struct scsi_host_template iscsi_iser_sht; 82static struct iscsi_transport iscsi_iser_transport; 83static struct scsi_transport_template *iscsi_iser_scsi_transport; 84static struct workqueue_struct *release_wq; 85static DEFINE_MUTEX(unbind_iser_conn_mutex); 86struct iser_global ig; 87 88int iser_debug_level = 0; 89module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR); 90MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 91 92static unsigned int iscsi_max_lun = 512; 93module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 94MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session (default:512"); 95 96unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS; 97module_param_named(max_sectors, iser_max_sectors, uint, S_IRUGO | S_IWUSR); 98MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command (default:1024"); 99 100bool iser_always_reg = true; 101module_param_named(always_register, iser_always_reg, bool, S_IRUGO); 102MODULE_PARM_DESC(always_register, 103 "Always register memory, even for continuous memory regions (default:true)"); 104 105bool iser_pi_enable = false; 106module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO); 107MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); 108 109int iser_pi_guard; 110module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO); 111MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]"); 112 113/* 114 * iscsi_iser_recv() - Process a successful recv completion 115 * @conn: iscsi connection 116 * @hdr: iscsi header 117 * @rx_data: buffer containing receive data payload 118 * @rx_data_len: length of rx_data 119 * 120 * Notes: In case of data length errors or iscsi PDU completion failures 121 * this routine will signal iscsi layer of connection failure. 122 */ 123void 124iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 125 char *rx_data, int rx_data_len) 126{ 127 int rc = 0; 128 int datalen; 129 130 /* verify PDU length */ 131 datalen = ntoh24(hdr->dlength); 132 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 133 iser_err("wrong datalen %d (hdr), %d (IB)\n", 134 datalen, rx_data_len); 135 rc = ISCSI_ERR_DATALEN; 136 goto error; 137 } 138 139 if (datalen != rx_data_len) 140 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 141 datalen, rx_data_len); 142 143 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 144 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 145 goto error; 146 147 return; 148error: 149 iscsi_conn_failure(conn, rc); 150} 151 152/** 153 * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU 154 * @task: iscsi task 155 * @opcode: iscsi command opcode 156 * 157 * Netes: This routine can't fail, just assign iscsi task 158 * hdr and max hdr size. 159 */ 160static int 161iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 162{ 163 struct iscsi_iser_task *iser_task = task->dd_data; 164 165 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 166 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 167 168 return 0; 169} 170 171/** 172 * iser_initialize_task_headers() - Initialize task headers 173 * @task: iscsi task 174 * @tx_desc: iser tx descriptor 175 * 176 * Notes: 177 * This routine may race with iser teardown flow for scsi 178 * error handling TMFs. So for TMF we should acquire the 179 * state mutex to avoid dereferencing the IB device which 180 * may have already been terminated. 181 */ 182int 183iser_initialize_task_headers(struct iscsi_task *task, 184 struct iser_tx_desc *tx_desc) 185{ 186 struct iser_conn *iser_conn = task->conn->dd_data; 187 struct iser_device *device = iser_conn->ib_conn.device; 188 struct iscsi_iser_task *iser_task = task->dd_data; 189 u64 dma_addr; 190 const bool mgmt_task = !task->sc && !in_interrupt(); 191 int ret = 0; 192 193 if (unlikely(mgmt_task)) 194 mutex_lock(&iser_conn->state_mutex); 195 196 if (unlikely(iser_conn->state != ISER_CONN_UP)) { 197 ret = -ENODEV; 198 goto out; 199 } 200 201 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 202 ISER_HEADERS_LEN, DMA_TO_DEVICE); 203 if (ib_dma_mapping_error(device->ib_device, dma_addr)) { 204 ret = -ENOMEM; 205 goto out; 206 } 207 208 tx_desc->inv_wr.next = NULL; 209 tx_desc->reg_wr.wr.next = NULL; 210 tx_desc->mapped = true; 211 tx_desc->dma_addr = dma_addr; 212 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 213 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 214 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 215 216 iser_task->iser_conn = iser_conn; 217out: 218 if (unlikely(mgmt_task)) 219 mutex_unlock(&iser_conn->state_mutex); 220 221 return ret; 222} 223 224/** 225 * iscsi_iser_task_init() - Initialize iscsi-iser task 226 * @task: iscsi task 227 * 228 * Initialize the task for the scsi command or mgmt command. 229 * 230 * Return: Returns zero on success or -ENOMEM when failing 231 * to init task headers (dma mapping error). 232 */ 233static int 234iscsi_iser_task_init(struct iscsi_task *task) 235{ 236 struct iscsi_iser_task *iser_task = task->dd_data; 237 int ret; 238 239 ret = iser_initialize_task_headers(task, &iser_task->desc); 240 if (ret) { 241 iser_err("Failed to init task %p, err = %d\n", 242 iser_task, ret); 243 return ret; 244 } 245 246 /* mgmt task */ 247 if (!task->sc) 248 return 0; 249 250 iser_task->command_sent = 0; 251 iser_task_rdma_init(iser_task); 252 iser_task->sc = task->sc; 253 254 return 0; 255} 256 257/** 258 * iscsi_iser_mtask_xmit() - xmit management (immediate) task 259 * @conn: iscsi connection 260 * @task: task management task 261 * 262 * Notes: 263 * The function can return -EAGAIN in which case caller must 264 * call it again later, or recover. '0' return code means successful 265 * xmit. 266 * 267 **/ 268static int 269iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 270{ 271 int error = 0; 272 273 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 274 275 error = iser_send_control(conn, task); 276 277 /* since iser xmits control with zero copy, tasks can not be recycled 278 * right after sending them. 279 * The recycling scheme is based on whether a response is expected 280 * - if yes, the task is recycled at iscsi_complete_pdu 281 * - if no, the task is recycled at iser_snd_completion 282 */ 283 return error; 284} 285 286static int 287iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 288 struct iscsi_task *task) 289{ 290 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 291 struct iscsi_data hdr; 292 int error = 0; 293 294 /* Send data-out PDUs while there's still unsolicited data to send */ 295 while (iscsi_task_has_unsol_data(task)) { 296 iscsi_prep_data_out_pdu(task, r2t, &hdr); 297 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 298 hdr.itt, r2t->data_count); 299 300 /* the buffer description has been passed with the command */ 301 /* Send the command */ 302 error = iser_send_data_out(conn, task, &hdr); 303 if (error) { 304 r2t->datasn--; 305 goto iscsi_iser_task_xmit_unsol_data_exit; 306 } 307 r2t->sent += r2t->data_count; 308 iser_dbg("Need to send %d more as data-out PDUs\n", 309 r2t->data_length - r2t->sent); 310 } 311 312iscsi_iser_task_xmit_unsol_data_exit: 313 return error; 314} 315 316/** 317 * iscsi_iser_task_xmit() - xmit iscsi-iser task 318 * @task: iscsi task 319 * 320 * Return: zero on success or escalates $error on failure. 321 */ 322static int 323iscsi_iser_task_xmit(struct iscsi_task *task) 324{ 325 struct iscsi_conn *conn = task->conn; 326 struct iscsi_iser_task *iser_task = task->dd_data; 327 int error = 0; 328 329 if (!task->sc) 330 return iscsi_iser_mtask_xmit(conn, task); 331 332 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 333 BUG_ON(scsi_bufflen(task->sc) == 0); 334 335 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 336 task->itt, scsi_bufflen(task->sc), 337 task->imm_count, task->unsol_r2t.data_length); 338 } 339 340 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 341 conn->id, task->itt); 342 343 /* Send the cmd PDU */ 344 if (!iser_task->command_sent) { 345 error = iser_send_command(conn, task); 346 if (error) 347 goto iscsi_iser_task_xmit_exit; 348 iser_task->command_sent = 1; 349 } 350 351 /* Send unsolicited data-out PDU(s) if necessary */ 352 if (iscsi_task_has_unsol_data(task)) 353 error = iscsi_iser_task_xmit_unsol_data(conn, task); 354 355 iscsi_iser_task_xmit_exit: 356 return error; 357} 358 359/** 360 * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task 361 * @task: iscsi task 362 * 363 * Notes: In case the RDMA device is already NULL (might have 364 * been removed in DEVICE_REMOVAL CM event it will bail-out 365 * without doing dma unmapping. 366 */ 367static void iscsi_iser_cleanup_task(struct iscsi_task *task) 368{ 369 struct iscsi_iser_task *iser_task = task->dd_data; 370 struct iser_tx_desc *tx_desc = &iser_task->desc; 371 struct iser_conn *iser_conn = task->conn->dd_data; 372 struct iser_device *device = iser_conn->ib_conn.device; 373 374 /* DEVICE_REMOVAL event might have already released the device */ 375 if (!device) 376 return; 377 378 if (likely(tx_desc->mapped)) { 379 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 380 ISER_HEADERS_LEN, DMA_TO_DEVICE); 381 tx_desc->mapped = false; 382 } 383 384 /* mgmt tasks do not need special cleanup */ 385 if (!task->sc) 386 return; 387 388 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 389 iser_task->status = ISER_TASK_STATUS_COMPLETED; 390 iser_task_rdma_finalize(iser_task); 391 } 392} 393 394/** 395 * iscsi_iser_check_protection() - check protection information status of task. 396 * @task: iscsi task 397 * @sector: error sector if exsists (output) 398 * 399 * Return: zero if no data-integrity errors have occured 400 * 0x1: data-integrity error occured in the guard-block 401 * 0x2: data-integrity error occured in the reference tag 402 * 0x3: data-integrity error occured in the application tag 403 * 404 * In addition the error sector is marked. 405 */ 406static u8 407iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 408{ 409 struct iscsi_iser_task *iser_task = task->dd_data; 410 enum iser_data_dir dir = iser_task->dir[ISER_DIR_IN] ? 411 ISER_DIR_IN : ISER_DIR_OUT; 412 413 return iser_check_task_pi_status(iser_task, dir, sector); 414} 415 416/** 417 * iscsi_iser_conn_create() - create a new iscsi-iser connection 418 * @cls_session: iscsi class connection 419 * @conn_idx: connection index within the session (for MCS) 420 * 421 * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL 422 * otherwise. 423 */ 424static struct iscsi_cls_conn * 425iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, 426 uint32_t conn_idx) 427{ 428 struct iscsi_conn *conn; 429 struct iscsi_cls_conn *cls_conn; 430 431 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 432 if (!cls_conn) 433 return NULL; 434 conn = cls_conn->dd_data; 435 436 /* 437 * due to issues with the login code re iser sematics 438 * this not set in iscsi_conn_setup - FIXME 439 */ 440 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 441 442 return cls_conn; 443} 444 445/** 446 * iscsi_iser_conn_bind() - bind iscsi and iser connection structures 447 * @cls_session: iscsi class session 448 * @cls_conn: iscsi class connection 449 * @transport_eph: transport end-point handle 450 * @is_leading: indicate if this is the session leading connection (MCS) 451 * 452 * Return: zero on success, $error if iscsi_conn_bind fails and 453 * -EINVAL in case end-point doesn't exsits anymore or iser connection 454 * state is not UP (teardown already started). 455 */ 456static int 457iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 458 struct iscsi_cls_conn *cls_conn, 459 uint64_t transport_eph, 460 int is_leading) 461{ 462 struct iscsi_conn *conn = cls_conn->dd_data; 463 struct iser_conn *iser_conn; 464 struct iscsi_endpoint *ep; 465 int error; 466 467 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 468 if (error) 469 return error; 470 471 /* the transport ep handle comes from user space so it must be 472 * verified against the global ib connections list */ 473 ep = iscsi_lookup_endpoint(transport_eph); 474 if (!ep) { 475 iser_err("can't bind eph %llx\n", 476 (unsigned long long)transport_eph); 477 return -EINVAL; 478 } 479 iser_conn = ep->dd_data; 480 481 mutex_lock(&iser_conn->state_mutex); 482 if (iser_conn->state != ISER_CONN_UP) { 483 error = -EINVAL; 484 iser_err("iser_conn %p state is %d, teardown started\n", 485 iser_conn, iser_conn->state); 486 goto out; 487 } 488 489 error = iser_alloc_rx_descriptors(iser_conn, conn->session); 490 if (error) 491 goto out; 492 493 /* binds the iSER connection retrieved from the previously 494 * connected ep_handle to the iSCSI layer connection. exchanges 495 * connection pointers */ 496 iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); 497 498 conn->dd_data = iser_conn; 499 iser_conn->iscsi_conn = conn; 500 501out: 502 iscsi_put_endpoint(ep); 503 mutex_unlock(&iser_conn->state_mutex); 504 return error; 505} 506 507/** 508 * iscsi_iser_conn_start() - start iscsi-iser connection 509 * @cls_conn: iscsi class connection 510 * 511 * Notes: Here iser intialize (or re-initialize) stop_completion as 512 * from this point iscsi must call conn_stop in session/connection 513 * teardown so iser transport must wait for it. 514 */ 515static int 516iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 517{ 518 struct iscsi_conn *iscsi_conn; 519 struct iser_conn *iser_conn; 520 521 iscsi_conn = cls_conn->dd_data; 522 iser_conn = iscsi_conn->dd_data; 523 reinit_completion(&iser_conn->stop_completion); 524 525 return iscsi_conn_start(cls_conn); 526} 527 528/** 529 * iscsi_iser_conn_stop() - stop iscsi-iser connection 530 * @cls_conn: iscsi class connection 531 * @flag: indicate if recover or terminate (passed as is) 532 * 533 * Notes: Calling iscsi_conn_stop might theoretically race with 534 * DEVICE_REMOVAL event and dereference a previously freed RDMA device 535 * handle, so we call it under iser the state lock to protect against 536 * this kind of race. 537 */ 538static void 539iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 540{ 541 struct iscsi_conn *conn = cls_conn->dd_data; 542 struct iser_conn *iser_conn = conn->dd_data; 543 544 iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); 545 546 /* 547 * Userspace may have goofed up and not bound the connection or 548 * might have only partially setup the connection. 549 */ 550 if (iser_conn) { 551 mutex_lock(&iser_conn->state_mutex); 552 mutex_lock(&unbind_iser_conn_mutex); 553 iser_conn_terminate(iser_conn); 554 iscsi_conn_stop(cls_conn, flag); 555 556 /* unbind */ 557 iser_conn->iscsi_conn = NULL; 558 conn->dd_data = NULL; 559 mutex_unlock(&unbind_iser_conn_mutex); 560 561 complete(&iser_conn->stop_completion); 562 mutex_unlock(&iser_conn->state_mutex); 563 } else { 564 iscsi_conn_stop(cls_conn, flag); 565 } 566} 567 568/** 569 * iscsi_iser_session_destroy() - destroy iscsi-iser session 570 * @cls_session: iscsi class session 571 * 572 * Removes and free iscsi host. 573 */ 574static void 575iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 576{ 577 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 578 579 iscsi_session_teardown(cls_session); 580 iscsi_host_remove(shost); 581 iscsi_host_free(shost); 582} 583 584static inline unsigned int 585iser_dif_prot_caps(int prot_caps) 586{ 587 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? 588 SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | 589 SHOST_DIX_TYPE1_PROTECTION : 0) | 590 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? 591 SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) | 592 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? 593 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0); 594} 595 596/** 597 * iscsi_iser_session_create() - create an iscsi-iser session 598 * @ep: iscsi end-point handle 599 * @cmds_max: maximum commands in this session 600 * @qdepth: session command queue depth 601 * @initial_cmdsn: initiator command sequnce number 602 * 603 * Allocates and adds a scsi host, expose DIF supprot if 604 * exists, and sets up an iscsi session. 605 */ 606static struct iscsi_cls_session * 607iscsi_iser_session_create(struct iscsi_endpoint *ep, 608 uint16_t cmds_max, uint16_t qdepth, 609 uint32_t initial_cmdsn) 610{ 611 struct iscsi_cls_session *cls_session; 612 struct Scsi_Host *shost; 613 struct iser_conn *iser_conn = NULL; 614 struct ib_conn *ib_conn; 615 struct ib_device *ib_dev; 616 u32 max_fr_sectors; 617 618 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 619 if (!shost) 620 return NULL; 621 shost->transportt = iscsi_iser_scsi_transport; 622 shost->cmd_per_lun = qdepth; 623 shost->max_lun = iscsi_max_lun; 624 shost->max_id = 0; 625 shost->max_channel = 0; 626 shost->max_cmd_len = 16; 627 628 /* 629 * older userspace tools (before 2.0-870) did not pass us 630 * the leading conn's ep so this will be NULL; 631 */ 632 if (ep) { 633 iser_conn = ep->dd_data; 634 shost->sg_tablesize = iser_conn->scsi_sg_tablesize; 635 shost->can_queue = min_t(u16, cmds_max, iser_conn->max_cmds); 636 637 mutex_lock(&iser_conn->state_mutex); 638 if (iser_conn->state != ISER_CONN_UP) { 639 iser_err("iser conn %p already started teardown\n", 640 iser_conn); 641 mutex_unlock(&iser_conn->state_mutex); 642 goto free_host; 643 } 644 645 ib_conn = &iser_conn->ib_conn; 646 ib_dev = ib_conn->device->ib_device; 647 if (ib_conn->pi_support) { 648 u32 sig_caps = ib_dev->attrs.sig_prot_cap; 649 650 shost->sg_prot_tablesize = shost->sg_tablesize; 651 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 652 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | 653 SHOST_DIX_GUARD_CRC); 654 } 655 656 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)) 657 shost->virt_boundary_mask = SZ_4K - 1; 658 659 if (iscsi_host_add(shost, ib_dev->dev.parent)) { 660 mutex_unlock(&iser_conn->state_mutex); 661 goto free_host; 662 } 663 mutex_unlock(&iser_conn->state_mutex); 664 } else { 665 shost->can_queue = min_t(u16, cmds_max, ISER_DEF_XMIT_CMDS_MAX); 666 if (iscsi_host_add(shost, NULL)) 667 goto free_host; 668 } 669 670 max_fr_sectors = (shost->sg_tablesize * PAGE_SIZE) >> 9; 671 shost->max_sectors = min(iser_max_sectors, max_fr_sectors); 672 673 iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n", 674 iser_conn, shost->sg_tablesize, 675 shost->max_sectors); 676 677 if (shost->max_sectors < iser_max_sectors) 678 iser_warn("max_sectors was reduced from %u to %u\n", 679 iser_max_sectors, shost->max_sectors); 680 681 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 682 shost->can_queue, 0, 683 sizeof(struct iscsi_iser_task), 684 initial_cmdsn, 0); 685 if (!cls_session) 686 goto remove_host; 687 688 return cls_session; 689 690remove_host: 691 iscsi_host_remove(shost); 692free_host: 693 iscsi_host_free(shost); 694 return NULL; 695} 696 697static int 698iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 699 enum iscsi_param param, char *buf, int buflen) 700{ 701 int value; 702 703 switch (param) { 704 case ISCSI_PARAM_MAX_RECV_DLENGTH: 705 /* TBD */ 706 break; 707 case ISCSI_PARAM_HDRDGST_EN: 708 sscanf(buf, "%d", &value); 709 if (value) { 710 iser_err("DataDigest wasn't negotiated to None\n"); 711 return -EPROTO; 712 } 713 break; 714 case ISCSI_PARAM_DATADGST_EN: 715 sscanf(buf, "%d", &value); 716 if (value) { 717 iser_err("DataDigest wasn't negotiated to None\n"); 718 return -EPROTO; 719 } 720 break; 721 case ISCSI_PARAM_IFMARKER_EN: 722 sscanf(buf, "%d", &value); 723 if (value) { 724 iser_err("IFMarker wasn't negotiated to No\n"); 725 return -EPROTO; 726 } 727 break; 728 case ISCSI_PARAM_OFMARKER_EN: 729 sscanf(buf, "%d", &value); 730 if (value) { 731 iser_err("OFMarker wasn't negotiated to No\n"); 732 return -EPROTO; 733 } 734 break; 735 default: 736 return iscsi_set_param(cls_conn, param, buf, buflen); 737 } 738 739 return 0; 740} 741 742/** 743 * iscsi_iser_set_param() - set class connection parameter 744 * @cls_conn: iscsi class connection 745 * @stats: iscsi stats to output 746 * 747 * Output connection statistics. 748 */ 749static void 750iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 751{ 752 struct iscsi_conn *conn = cls_conn->dd_data; 753 754 stats->txdata_octets = conn->txdata_octets; 755 stats->rxdata_octets = conn->rxdata_octets; 756 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 757 stats->dataout_pdus = conn->dataout_pdus_cnt; 758 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 759 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 760 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 761 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 762 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 763 stats->custom_length = 0; 764} 765 766static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 767 enum iscsi_param param, char *buf) 768{ 769 struct iser_conn *iser_conn = ep->dd_data; 770 771 switch (param) { 772 case ISCSI_PARAM_CONN_PORT: 773 case ISCSI_PARAM_CONN_ADDRESS: 774 if (!iser_conn || !iser_conn->ib_conn.cma_id) 775 return -ENOTCONN; 776 777 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 778 &iser_conn->ib_conn.cma_id->route.addr.dst_addr, 779 param, buf); 780 default: 781 break; 782 } 783 return -ENOSYS; 784} 785 786/** 787 * iscsi_iser_ep_connect() - Initiate iSER connection establishment 788 * @shost: scsi_host 789 * @dst_addr: destination address 790 * @non_blocking: indicate if routine can block 791 * 792 * Allocate an iscsi endpoint, an iser_conn structure and bind them. 793 * After that start RDMA connection establishment via rdma_cm. We 794 * don't allocate iser_conn embedded in iscsi_endpoint since in teardown 795 * the endpoint will be destroyed at ep_disconnect while iser_conn will 796 * cleanup its resources asynchronuously. 797 * 798 * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) 799 * if fails. 800 */ 801static struct iscsi_endpoint * 802iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 803 int non_blocking) 804{ 805 int err; 806 struct iser_conn *iser_conn; 807 struct iscsi_endpoint *ep; 808 809 ep = iscsi_create_endpoint(0); 810 if (!ep) 811 return ERR_PTR(-ENOMEM); 812 813 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); 814 if (!iser_conn) { 815 err = -ENOMEM; 816 goto failure; 817 } 818 819 ep->dd_data = iser_conn; 820 iser_conn->ep = ep; 821 iser_conn_init(iser_conn); 822 823 err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); 824 if (err) 825 goto failure; 826 827 return ep; 828failure: 829 iscsi_destroy_endpoint(ep); 830 return ERR_PTR(err); 831} 832 833/** 834 * iscsi_iser_ep_poll() - poll for iser connection establishment to complete 835 * @ep: iscsi endpoint (created at ep_connect) 836 * @timeout_ms: polling timeout allowed in ms. 837 * 838 * This routine boils down to waiting for up_completion signaling 839 * that cma_id got CONNECTED event. 840 * 841 * Return: 1 if succeeded in connection establishment, 0 if timeout expired 842 * (libiscsi will retry will kick in) or -1 if interrupted by signal 843 * or more likely iser connection state transitioned to TEMINATING or 844 * DOWN during the wait period. 845 */ 846static int 847iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 848{ 849 struct iser_conn *iser_conn = ep->dd_data; 850 int rc; 851 852 rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, 853 msecs_to_jiffies(timeout_ms)); 854 /* if conn establishment failed, return error code to iscsi */ 855 if (rc == 0) { 856 mutex_lock(&iser_conn->state_mutex); 857 if (iser_conn->state == ISER_CONN_TERMINATING || 858 iser_conn->state == ISER_CONN_DOWN) 859 rc = -1; 860 mutex_unlock(&iser_conn->state_mutex); 861 } 862 863 iser_info("iser conn %p rc = %d\n", iser_conn, rc); 864 865 if (rc > 0) 866 return 1; /* success, this is the equivalent of EPOLLOUT */ 867 else if (!rc) 868 return 0; /* timeout */ 869 else 870 return rc; /* signal */ 871} 872 873/** 874 * iscsi_iser_ep_disconnect() - Initiate connection teardown process 875 * @ep: iscsi endpoint handle 876 * 877 * This routine is not blocked by iser and RDMA termination process 878 * completion as we queue a deffered work for iser/RDMA destruction 879 * and cleanup or actually call it immediately in case we didn't pass 880 * iscsi conn bind/start stage, thus it is safe. 881 */ 882static void 883iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 884{ 885 struct iser_conn *iser_conn = ep->dd_data; 886 887 iser_info("ep %p iser conn %p\n", ep, iser_conn); 888 889 mutex_lock(&iser_conn->state_mutex); 890 iser_conn_terminate(iser_conn); 891 892 /* 893 * if iser_conn and iscsi_conn are bound, we must wait for 894 * iscsi_conn_stop and flush errors completion before freeing 895 * the iser resources. Otherwise we are safe to free resources 896 * immediately. 897 */ 898 if (iser_conn->iscsi_conn) { 899 INIT_WORK(&iser_conn->release_work, iser_release_work); 900 queue_work(release_wq, &iser_conn->release_work); 901 mutex_unlock(&iser_conn->state_mutex); 902 } else { 903 iser_conn->state = ISER_CONN_DOWN; 904 mutex_unlock(&iser_conn->state_mutex); 905 iser_conn_release(iser_conn); 906 } 907 908 iscsi_destroy_endpoint(ep); 909} 910 911static umode_t iser_attr_is_visible(int param_type, int param) 912{ 913 switch (param_type) { 914 case ISCSI_HOST_PARAM: 915 switch (param) { 916 case ISCSI_HOST_PARAM_NETDEV_NAME: 917 case ISCSI_HOST_PARAM_HWADDRESS: 918 case ISCSI_HOST_PARAM_INITIATOR_NAME: 919 return S_IRUGO; 920 default: 921 return 0; 922 } 923 case ISCSI_PARAM: 924 switch (param) { 925 case ISCSI_PARAM_MAX_RECV_DLENGTH: 926 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 927 case ISCSI_PARAM_HDRDGST_EN: 928 case ISCSI_PARAM_DATADGST_EN: 929 case ISCSI_PARAM_CONN_ADDRESS: 930 case ISCSI_PARAM_CONN_PORT: 931 case ISCSI_PARAM_EXP_STATSN: 932 case ISCSI_PARAM_PERSISTENT_ADDRESS: 933 case ISCSI_PARAM_PERSISTENT_PORT: 934 case ISCSI_PARAM_PING_TMO: 935 case ISCSI_PARAM_RECV_TMO: 936 case ISCSI_PARAM_INITIAL_R2T_EN: 937 case ISCSI_PARAM_MAX_R2T: 938 case ISCSI_PARAM_IMM_DATA_EN: 939 case ISCSI_PARAM_FIRST_BURST: 940 case ISCSI_PARAM_MAX_BURST: 941 case ISCSI_PARAM_PDU_INORDER_EN: 942 case ISCSI_PARAM_DATASEQ_INORDER_EN: 943 case ISCSI_PARAM_TARGET_NAME: 944 case ISCSI_PARAM_TPGT: 945 case ISCSI_PARAM_USERNAME: 946 case ISCSI_PARAM_PASSWORD: 947 case ISCSI_PARAM_USERNAME_IN: 948 case ISCSI_PARAM_PASSWORD_IN: 949 case ISCSI_PARAM_FAST_ABORT: 950 case ISCSI_PARAM_ABORT_TMO: 951 case ISCSI_PARAM_LU_RESET_TMO: 952 case ISCSI_PARAM_TGT_RESET_TMO: 953 case ISCSI_PARAM_IFACE_NAME: 954 case ISCSI_PARAM_INITIATOR_NAME: 955 case ISCSI_PARAM_DISCOVERY_SESS: 956 return S_IRUGO; 957 default: 958 return 0; 959 } 960 } 961 962 return 0; 963} 964 965static struct scsi_host_template iscsi_iser_sht = { 966 .module = THIS_MODULE, 967 .name = "iSCSI Initiator over iSER", 968 .queuecommand = iscsi_queuecommand, 969 .change_queue_depth = scsi_change_queue_depth, 970 .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE, 971 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 972 .eh_timed_out = iscsi_eh_cmd_timed_out, 973 .eh_abort_handler = iscsi_eh_abort, 974 .eh_device_reset_handler= iscsi_eh_device_reset, 975 .eh_target_reset_handler = iscsi_eh_recover_target, 976 .target_alloc = iscsi_target_alloc, 977 .proc_name = "iscsi_iser", 978 .this_id = -1, 979 .track_queue_depth = 1, 980}; 981 982static struct iscsi_transport iscsi_iser_transport = { 983 .owner = THIS_MODULE, 984 .name = "iser", 985 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 986 /* session management */ 987 .create_session = iscsi_iser_session_create, 988 .destroy_session = iscsi_iser_session_destroy, 989 /* connection management */ 990 .create_conn = iscsi_iser_conn_create, 991 .bind_conn = iscsi_iser_conn_bind, 992 .unbind_conn = iscsi_conn_unbind, 993 .destroy_conn = iscsi_conn_teardown, 994 .attr_is_visible = iser_attr_is_visible, 995 .set_param = iscsi_iser_set_param, 996 .get_conn_param = iscsi_conn_get_param, 997 .get_ep_param = iscsi_iser_get_ep_param, 998 .get_session_param = iscsi_session_get_param, 999 .start_conn = iscsi_iser_conn_start, 1000 .stop_conn = iscsi_iser_conn_stop, 1001 /* iscsi host params */ 1002 .get_host_param = iscsi_host_get_param, 1003 .set_host_param = iscsi_host_set_param, 1004 /* IO */ 1005 .send_pdu = iscsi_conn_send_pdu, 1006 .get_stats = iscsi_iser_conn_get_stats, 1007 .init_task = iscsi_iser_task_init, 1008 .xmit_task = iscsi_iser_task_xmit, 1009 .cleanup_task = iscsi_iser_cleanup_task, 1010 .alloc_pdu = iscsi_iser_pdu_alloc, 1011 .check_protection = iscsi_iser_check_protection, 1012 /* recovery */ 1013 .session_recovery_timedout = iscsi_session_recovery_timedout, 1014 1015 .ep_connect = iscsi_iser_ep_connect, 1016 .ep_poll = iscsi_iser_ep_poll, 1017 .ep_disconnect = iscsi_iser_ep_disconnect 1018}; 1019 1020static int __init iser_init(void) 1021{ 1022 int err; 1023 1024 iser_dbg("Starting iSER datamover...\n"); 1025 1026 if (iscsi_max_lun < 1) { 1027 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 1028 return -EINVAL; 1029 } 1030 1031 memset(&ig, 0, sizeof(struct iser_global)); 1032 1033 ig.desc_cache = kmem_cache_create("iser_descriptors", 1034 sizeof(struct iser_tx_desc), 1035 0, SLAB_HWCACHE_ALIGN, 1036 NULL); 1037 if (ig.desc_cache == NULL) 1038 return -ENOMEM; 1039 1040 /* device init is called only after the first addr resolution */ 1041 mutex_init(&ig.device_list_mutex); 1042 INIT_LIST_HEAD(&ig.device_list); 1043 mutex_init(&ig.connlist_mutex); 1044 INIT_LIST_HEAD(&ig.connlist); 1045 1046 release_wq = alloc_workqueue("release workqueue", 0, 0); 1047 if (!release_wq) { 1048 iser_err("failed to allocate release workqueue\n"); 1049 err = -ENOMEM; 1050 goto err_alloc_wq; 1051 } 1052 1053 iscsi_iser_scsi_transport = iscsi_register_transport( 1054 &iscsi_iser_transport); 1055 if (!iscsi_iser_scsi_transport) { 1056 iser_err("iscsi_register_transport failed\n"); 1057 err = -EINVAL; 1058 goto err_reg; 1059 } 1060 1061 return 0; 1062 1063err_reg: 1064 destroy_workqueue(release_wq); 1065err_alloc_wq: 1066 kmem_cache_destroy(ig.desc_cache); 1067 1068 return err; 1069} 1070 1071static void __exit iser_exit(void) 1072{ 1073 struct iser_conn *iser_conn, *n; 1074 int connlist_empty; 1075 1076 iser_dbg("Removing iSER datamover...\n"); 1077 destroy_workqueue(release_wq); 1078 1079 mutex_lock(&ig.connlist_mutex); 1080 connlist_empty = list_empty(&ig.connlist); 1081 mutex_unlock(&ig.connlist_mutex); 1082 1083 if (!connlist_empty) { 1084 iser_err("Error cleanup stage completed but we still have iser " 1085 "connections, destroying them anyway\n"); 1086 list_for_each_entry_safe(iser_conn, n, &ig.connlist, 1087 conn_list) { 1088 iser_conn_release(iser_conn); 1089 } 1090 } 1091 1092 iscsi_unregister_transport(&iscsi_iser_transport); 1093 kmem_cache_destroy(ig.desc_cache); 1094} 1095 1096module_init(iser_init); 1097module_exit(iser_exit); 1098