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1/*2 * iSCSI Initiator over iSER Data-Path3 *4 * Copyright (C) 2004 Dmitry Yusupov5 * Copyright (C) 2004 Alex Aizman6 * Copyright (C) 2005 Mike Christie7 * 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.org10 *11 * This software is available to you under a choice of one of two12 * licenses. You may choose to be licensed under the terms of the GNU13 * General Public License (GPL) Version 2, available from the file14 * COPYING in the main directory of this source tree, or the15 * OpenIB.org BSD license below:16 *17 * Redistribution and use in source and binary forms, with or18 * without modification, are permitted provided that the following19 * conditions are met:20 *21 * - Redistributions of source code must retain the above22 * copyright notice, this list of conditions and the following23 * disclaimer.24 *25 * - Redistributions in binary form must reproduce the above26 * copyright notice, this list of conditions and the following27 * disclaimer in the documentation and/or other materials28 * 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 OF32 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND33 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS34 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN36 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE37 * SOFTWARE.38 *39 * Credits:40 * Christoph Hellwig41 * FUJITA Tomonori42 * Arne Redlich43 * Zhenyu Wang44 * Modified by:45 * Erez Zilber46 */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 const 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 int iscsi_iser_set(const char *val, const struct kernel_param *kp);93static const struct kernel_param_ops iscsi_iser_size_ops = {94 .set = iscsi_iser_set,95 .get = param_get_uint,96};97 98static unsigned int iscsi_max_lun = 512;99module_param_cb(max_lun, &iscsi_iser_size_ops, &iscsi_max_lun, S_IRUGO);100MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session, should > 0 (default:512)");101 102unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS;103module_param_cb(max_sectors, &iscsi_iser_size_ops, &iser_max_sectors,104 S_IRUGO | S_IWUSR);105MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command, should > 0 (default:1024)");106 107bool iser_always_reg = true;108module_param_named(always_register, iser_always_reg, bool, S_IRUGO);109MODULE_PARM_DESC(always_register,110 "Always register memory, even for continuous memory regions (default:true)");111 112bool iser_pi_enable = false;113module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO);114MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");115 116static int iscsi_iser_set(const char *val, const struct kernel_param *kp)117{118 int ret;119 unsigned int n = 0;120 121 ret = kstrtouint(val, 10, &n);122 if (ret != 0 || n == 0)123 return -EINVAL;124 125 return param_set_uint(val, kp);126}127 128/*129 * iscsi_iser_recv() - Process a successful recv completion130 * @conn: iscsi connection131 * @hdr: iscsi header132 * @rx_data: buffer containing receive data payload133 * @rx_data_len: length of rx_data134 *135 * Notes: In case of data length errors or iscsi PDU completion failures136 * this routine will signal iscsi layer of connection failure.137 */138void iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr,139 char *rx_data, int rx_data_len)140{141 int rc = 0;142 int datalen;143 144 /* verify PDU length */145 datalen = ntoh24(hdr->dlength);146 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {147 iser_err("wrong datalen %d (hdr), %d (IB)\n",148 datalen, rx_data_len);149 rc = ISCSI_ERR_DATALEN;150 goto error;151 }152 153 if (datalen != rx_data_len)154 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",155 datalen, rx_data_len);156 157 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);158 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)159 goto error;160 161 return;162error:163 iscsi_conn_failure(conn, rc);164}165 166/**167 * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU168 * @task: iscsi task169 * @opcode: iscsi command opcode170 *171 * Netes: This routine can't fail, just assign iscsi task172 * hdr and max hdr size.173 */174static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)175{176 struct iscsi_iser_task *iser_task = task->dd_data;177 178 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;179 task->hdr_max = sizeof(iser_task->desc.iscsi_header);180 181 return 0;182}183 184/**185 * iser_initialize_task_headers() - Initialize task headers186 * @task: iscsi task187 * @tx_desc: iser tx descriptor188 *189 * Notes:190 * This routine may race with iser teardown flow for scsi191 * error handling TMFs. So for TMF we should acquire the192 * state mutex to avoid dereferencing the IB device which193 * may have already been terminated.194 */195int iser_initialize_task_headers(struct iscsi_task *task,196 struct iser_tx_desc *tx_desc)197{198 struct iser_conn *iser_conn = task->conn->dd_data;199 struct iser_device *device = iser_conn->ib_conn.device;200 struct iscsi_iser_task *iser_task = task->dd_data;201 u64 dma_addr;202 203 if (unlikely(iser_conn->state != ISER_CONN_UP))204 return -ENODEV;205 206 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,207 ISER_HEADERS_LEN, DMA_TO_DEVICE);208 if (ib_dma_mapping_error(device->ib_device, dma_addr))209 return -ENOMEM;210 211 tx_desc->inv_wr.next = NULL;212 tx_desc->reg_wr.wr.next = NULL;213 tx_desc->mapped = true;214 tx_desc->dma_addr = dma_addr;215 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;216 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;217 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;218 219 iser_task->iser_conn = iser_conn;220 221 return 0;222}223 224/**225 * iscsi_iser_task_init() - Initialize iscsi-iser task226 * @task: iscsi task227 *228 * Initialize the task for the scsi command or mgmt command.229 *230 * Return: Returns zero on success or -ENOMEM when failing231 * to init task headers (dma mapping error).232 */233static int iscsi_iser_task_init(struct iscsi_task *task)234{235 struct iscsi_iser_task *iser_task = task->dd_data;236 int ret;237 238 ret = iser_initialize_task_headers(task, &iser_task->desc);239 if (ret) {240 iser_err("Failed to init task %p, err = %d\n",241 iser_task, ret);242 return ret;243 }244 245 /* mgmt task */246 if (!task->sc)247 return 0;248 249 iser_task->command_sent = 0;250 iser_task_rdma_init(iser_task);251 iser_task->sc = task->sc;252 253 return 0;254}255 256/**257 * iscsi_iser_mtask_xmit() - xmit management (immediate) task258 * @conn: iscsi connection259 * @task: task management task260 *261 * Notes:262 * The function can return -EAGAIN in which case caller must263 * call it again later, or recover. '0' return code means successful264 * xmit.265 *266 **/267static int iscsi_iser_mtask_xmit(struct iscsi_conn *conn,268 struct iscsi_task *task)269{270 int error = 0;271 272 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);273 274 error = iser_send_control(conn, task);275 276 /* since iser xmits control with zero copy, tasks can not be recycled277 * right after sending them.278 * The recycling scheme is based on whether a response is expected279 * - if yes, the task is recycled at iscsi_complete_pdu280 * - if no, the task is recycled at iser_snd_completion281 */282 return error;283}284 285static int iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,286 struct iscsi_task *task)287{288 struct iscsi_r2t_info *r2t = &task->unsol_r2t;289 struct iscsi_data hdr;290 int error = 0;291 292 /* Send data-out PDUs while there's still unsolicited data to send */293 while (iscsi_task_has_unsol_data(task)) {294 iscsi_prep_data_out_pdu(task, r2t, &hdr);295 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",296 hdr.itt, r2t->data_count);297 298 /* the buffer description has been passed with the command */299 /* Send the command */300 error = iser_send_data_out(conn, task, &hdr);301 if (error) {302 r2t->datasn--;303 goto iscsi_iser_task_xmit_unsol_data_exit;304 }305 r2t->sent += r2t->data_count;306 iser_dbg("Need to send %d more as data-out PDUs\n",307 r2t->data_length - r2t->sent);308 }309 310iscsi_iser_task_xmit_unsol_data_exit:311 return error;312}313 314/**315 * iscsi_iser_task_xmit() - xmit iscsi-iser task316 * @task: iscsi task317 *318 * Return: zero on success or escalates $error on failure.319 */320static int iscsi_iser_task_xmit(struct iscsi_task *task)321{322 struct iscsi_conn *conn = task->conn;323 struct iscsi_iser_task *iser_task = task->dd_data;324 int error = 0;325 326 if (!task->sc)327 return iscsi_iser_mtask_xmit(conn, task);328 329 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {330 BUG_ON(scsi_bufflen(task->sc) == 0);331 332 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",333 task->itt, scsi_bufflen(task->sc),334 task->imm_count, task->unsol_r2t.data_length);335 }336 337 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",338 conn->id, task->itt);339 340 /* Send the cmd PDU */341 if (!iser_task->command_sent) {342 error = iser_send_command(conn, task);343 if (error)344 goto iscsi_iser_task_xmit_exit;345 iser_task->command_sent = 1;346 }347 348 /* Send unsolicited data-out PDU(s) if necessary */349 if (iscsi_task_has_unsol_data(task))350 error = iscsi_iser_task_xmit_unsol_data(conn, task);351 352 iscsi_iser_task_xmit_exit:353 return error;354}355 356/**357 * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task358 * @task: iscsi task359 *360 * Notes: In case the RDMA device is already NULL (might have361 * been removed in DEVICE_REMOVAL CM event it will bail-out362 * without doing dma unmapping.363 */364static void iscsi_iser_cleanup_task(struct iscsi_task *task)365{366 struct iscsi_iser_task *iser_task = task->dd_data;367 struct iser_tx_desc *tx_desc = &iser_task->desc;368 struct iser_conn *iser_conn = task->conn->dd_data;369 struct iser_device *device = iser_conn->ib_conn.device;370 371 /* DEVICE_REMOVAL event might have already released the device */372 if (!device)373 return;374 375 if (likely(tx_desc->mapped)) {376 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,377 ISER_HEADERS_LEN, DMA_TO_DEVICE);378 tx_desc->mapped = false;379 }380 381 /* mgmt tasks do not need special cleanup */382 if (!task->sc)383 return;384 385 if (iser_task->status == ISER_TASK_STATUS_STARTED) {386 iser_task->status = ISER_TASK_STATUS_COMPLETED;387 iser_task_rdma_finalize(iser_task);388 }389}390 391/**392 * iscsi_iser_check_protection() - check protection information status of task.393 * @task: iscsi task394 * @sector: error sector if exsists (output)395 *396 * Return: zero if no data-integrity errors have occured397 * 0x1: data-integrity error occured in the guard-block398 * 0x2: data-integrity error occured in the reference tag399 * 0x3: data-integrity error occured in the application tag400 *401 * In addition the error sector is marked.402 */403static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)404{405 struct iscsi_iser_task *iser_task = task->dd_data;406 enum iser_data_dir dir = iser_task->dir[ISER_DIR_IN] ?407 ISER_DIR_IN : ISER_DIR_OUT;408 409 return iser_check_task_pi_status(iser_task, dir, sector);410}411 412/**413 * iscsi_iser_conn_create() - create a new iscsi-iser connection414 * @cls_session: iscsi class connection415 * @conn_idx: connection index within the session (for MCS)416 *417 * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL418 * otherwise.419 */420static struct iscsi_cls_conn *421iscsi_iser_conn_create(struct iscsi_cls_session *cls_session,422 uint32_t conn_idx)423{424 struct iscsi_conn *conn;425 struct iscsi_cls_conn *cls_conn;426 427 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);428 if (!cls_conn)429 return NULL;430 conn = cls_conn->dd_data;431 432 /*433 * due to issues with the login code re iser sematics434 * this not set in iscsi_conn_setup - FIXME435 */436 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;437 438 return cls_conn;439}440 441/**442 * iscsi_iser_conn_bind() - bind iscsi and iser connection structures443 * @cls_session: iscsi class session444 * @cls_conn: iscsi class connection445 * @transport_eph: transport end-point handle446 * @is_leading: indicate if this is the session leading connection (MCS)447 *448 * Return: zero on success, $error if iscsi_conn_bind fails and449 * -EINVAL in case end-point doesn't exists anymore or iser connection450 * state is not UP (teardown already started).451 */452static int iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,453 struct iscsi_cls_conn *cls_conn,454 uint64_t transport_eph, int is_leading)455{456 struct iscsi_conn *conn = cls_conn->dd_data;457 struct iser_conn *iser_conn;458 struct iscsi_endpoint *ep;459 int error;460 461 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);462 if (error)463 return error;464 465 /* the transport ep handle comes from user space so it must be466 * verified against the global ib connections list */467 ep = iscsi_lookup_endpoint(transport_eph);468 if (!ep) {469 iser_err("can't bind eph %llx\n",470 (unsigned long long)transport_eph);471 return -EINVAL;472 }473 iser_conn = ep->dd_data;474 475 mutex_lock(&iser_conn->state_mutex);476 if (iser_conn->state != ISER_CONN_UP) {477 error = -EINVAL;478 iser_err("iser_conn %p state is %d, teardown started\n",479 iser_conn, iser_conn->state);480 goto out;481 }482 483 error = iser_alloc_rx_descriptors(iser_conn, conn->session);484 if (error)485 goto out;486 487 /* binds the iSER connection retrieved from the previously488 * connected ep_handle to the iSCSI layer connection. exchanges489 * connection pointers */490 iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn);491 492 conn->dd_data = iser_conn;493 iser_conn->iscsi_conn = conn;494 495out:496 iscsi_put_endpoint(ep);497 mutex_unlock(&iser_conn->state_mutex);498 return error;499}500 501/**502 * iscsi_iser_conn_start() - start iscsi-iser connection503 * @cls_conn: iscsi class connection504 *505 * Notes: Here iser intialize (or re-initialize) stop_completion as506 * from this point iscsi must call conn_stop in session/connection507 * teardown so iser transport must wait for it.508 */509static int iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)510{511 struct iscsi_conn *iscsi_conn;512 struct iser_conn *iser_conn;513 514 iscsi_conn = cls_conn->dd_data;515 iser_conn = iscsi_conn->dd_data;516 reinit_completion(&iser_conn->stop_completion);517 518 return iscsi_conn_start(cls_conn);519}520 521/**522 * iscsi_iser_conn_stop() - stop iscsi-iser connection523 * @cls_conn: iscsi class connection524 * @flag: indicate if recover or terminate (passed as is)525 *526 * Notes: Calling iscsi_conn_stop might theoretically race with527 * DEVICE_REMOVAL event and dereference a previously freed RDMA device528 * handle, so we call it under iser the state lock to protect against529 * this kind of race.530 */531static void iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)532{533 struct iscsi_conn *conn = cls_conn->dd_data;534 struct iser_conn *iser_conn = conn->dd_data;535 536 iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);537 538 /*539 * Userspace may have goofed up and not bound the connection or540 * might have only partially setup the connection.541 */542 if (iser_conn) {543 mutex_lock(&iser_conn->state_mutex);544 mutex_lock(&unbind_iser_conn_mutex);545 iser_conn_terminate(iser_conn);546 iscsi_conn_stop(cls_conn, flag);547 548 /* unbind */549 iser_conn->iscsi_conn = NULL;550 conn->dd_data = NULL;551 mutex_unlock(&unbind_iser_conn_mutex);552 553 complete(&iser_conn->stop_completion);554 mutex_unlock(&iser_conn->state_mutex);555 } else {556 iscsi_conn_stop(cls_conn, flag);557 }558}559 560/**561 * iscsi_iser_session_destroy() - destroy iscsi-iser session562 * @cls_session: iscsi class session563 *564 * Removes and free iscsi host.565 */566static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)567{568 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);569 570 iscsi_session_teardown(cls_session);571 iscsi_host_remove(shost, false);572 iscsi_host_free(shost);573}574 575static inline unsigned int iser_dif_prot_caps(int prot_caps)576{577 int ret = 0;578 579 if (prot_caps & IB_PROT_T10DIF_TYPE_1)580 ret |= SHOST_DIF_TYPE1_PROTECTION |581 SHOST_DIX_TYPE0_PROTECTION |582 SHOST_DIX_TYPE1_PROTECTION;583 if (prot_caps & IB_PROT_T10DIF_TYPE_2)584 ret |= SHOST_DIF_TYPE2_PROTECTION |585 SHOST_DIX_TYPE2_PROTECTION;586 if (prot_caps & IB_PROT_T10DIF_TYPE_3)587 ret |= SHOST_DIF_TYPE3_PROTECTION |588 SHOST_DIX_TYPE3_PROTECTION;589 590 return ret;591}592 593/**594 * iscsi_iser_session_create() - create an iscsi-iser session595 * @ep: iscsi end-point handle596 * @cmds_max: maximum commands in this session597 * @qdepth: session command queue depth598 * @initial_cmdsn: initiator command sequnce number599 *600 * Allocates and adds a scsi host, expose DIF supprot if601 * exists, and sets up an iscsi session.602 */603static struct iscsi_cls_session *604iscsi_iser_session_create(struct iscsi_endpoint *ep,605 uint16_t cmds_max, uint16_t qdepth,606 uint32_t initial_cmdsn)607{608 struct iscsi_cls_session *cls_session;609 struct Scsi_Host *shost;610 struct iser_conn *iser_conn = NULL;611 struct ib_conn *ib_conn;612 struct ib_device *ib_dev;613 u32 max_fr_sectors;614 615 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);616 if (!shost)617 return NULL;618 shost->transportt = iscsi_iser_scsi_transport;619 shost->cmd_per_lun = qdepth;620 shost->max_lun = iscsi_max_lun;621 shost->max_id = 0;622 shost->max_channel = 0;623 shost->max_cmd_len = 16;624 625 /*626 * older userspace tools (before 2.0-870) did not pass us627 * the leading conn's ep so this will be NULL;628 */629 if (ep) {630 iser_conn = ep->dd_data;631 shost->sg_tablesize = iser_conn->scsi_sg_tablesize;632 shost->can_queue = min_t(u16, cmds_max, iser_conn->max_cmds);633 634 mutex_lock(&iser_conn->state_mutex);635 if (iser_conn->state != ISER_CONN_UP) {636 iser_err("iser conn %p already started teardown\n",637 iser_conn);638 mutex_unlock(&iser_conn->state_mutex);639 goto free_host;640 }641 642 ib_conn = &iser_conn->ib_conn;643 ib_dev = ib_conn->device->ib_device;644 if (ib_conn->pi_support) {645 u32 sig_caps = ib_dev->attrs.sig_prot_cap;646 647 shost->sg_prot_tablesize = shost->sg_tablesize;648 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));649 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |650 SHOST_DIX_GUARD_CRC);651 }652 653 if (!(ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG))654 shost->virt_boundary_mask = SZ_4K - 1;655 656 if (iscsi_host_add(shost, ib_dev->dev.parent)) {657 mutex_unlock(&iser_conn->state_mutex);658 goto free_host;659 }660 mutex_unlock(&iser_conn->state_mutex);661 } else {662 shost->can_queue = min_t(u16, cmds_max, ISER_DEF_XMIT_CMDS_MAX);663 if (iscsi_host_add(shost, NULL))664 goto free_host;665 }666 667 max_fr_sectors = (shost->sg_tablesize * PAGE_SIZE) >> 9;668 shost->max_sectors = min(iser_max_sectors, max_fr_sectors);669 670 iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n",671 iser_conn, shost->sg_tablesize,672 shost->max_sectors);673 674 if (shost->max_sectors < iser_max_sectors)675 iser_warn("max_sectors was reduced from %u to %u\n",676 iser_max_sectors, shost->max_sectors);677 678 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,679 shost->can_queue, 0,680 sizeof(struct iscsi_iser_task),681 initial_cmdsn, 0);682 if (!cls_session)683 goto remove_host;684 685 return cls_session;686 687remove_host:688 iscsi_host_remove(shost, false);689free_host:690 iscsi_host_free(shost);691 return NULL;692}693 694static int iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,695 enum iscsi_param param, char *buf, int buflen)696{697 int value;698 699 switch (param) {700 case ISCSI_PARAM_MAX_RECV_DLENGTH:701 /* TBD */702 break;703 case ISCSI_PARAM_HDRDGST_EN:704 sscanf(buf, "%d", &value);705 if (value) {706 iser_err("DataDigest wasn't negotiated to None\n");707 return -EPROTO;708 }709 break;710 case ISCSI_PARAM_DATADGST_EN:711 sscanf(buf, "%d", &value);712 if (value) {713 iser_err("DataDigest wasn't negotiated to None\n");714 return -EPROTO;715 }716 break;717 case ISCSI_PARAM_IFMARKER_EN:718 sscanf(buf, "%d", &value);719 if (value) {720 iser_err("IFMarker wasn't negotiated to No\n");721 return -EPROTO;722 }723 break;724 case ISCSI_PARAM_OFMARKER_EN:725 sscanf(buf, "%d", &value);726 if (value) {727 iser_err("OFMarker wasn't negotiated to No\n");728 return -EPROTO;729 }730 break;731 default:732 return iscsi_set_param(cls_conn, param, buf, buflen);733 }734 735 return 0;736}737 738/**739 * iscsi_iser_conn_get_stats() - get iscsi connection statistics740 * @cls_conn: iscsi class connection741 * @stats: iscsi stats to output742 *743 * Output connection statistics.744 */745static void iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn,746 struct iscsi_stats *stats)747{748 struct iscsi_conn *conn = cls_conn->dd_data;749 750 stats->txdata_octets = conn->txdata_octets;751 stats->rxdata_octets = conn->rxdata_octets;752 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;753 stats->dataout_pdus = conn->dataout_pdus_cnt;754 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;755 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */756 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */757 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;758 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;759 stats->custom_length = 0;760}761 762static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,763 enum iscsi_param param, char *buf)764{765 struct iser_conn *iser_conn = ep->dd_data;766 767 switch (param) {768 case ISCSI_PARAM_CONN_PORT:769 case ISCSI_PARAM_CONN_ADDRESS:770 if (!iser_conn || !iser_conn->ib_conn.cma_id)771 return -ENOTCONN;772 773 return iscsi_conn_get_addr_param((struct sockaddr_storage *)774 &iser_conn->ib_conn.cma_id->route.addr.dst_addr,775 param, buf);776 default:777 break;778 }779 return -ENOSYS;780}781 782/**783 * iscsi_iser_ep_connect() - Initiate iSER connection establishment784 * @shost: scsi_host785 * @dst_addr: destination address786 * @non_blocking: indicate if routine can block787 *788 * Allocate an iscsi endpoint, an iser_conn structure and bind them.789 * After that start RDMA connection establishment via rdma_cm. We790 * don't allocate iser_conn embedded in iscsi_endpoint since in teardown791 * the endpoint will be destroyed at ep_disconnect while iser_conn will792 * cleanup its resources asynchronuously.793 *794 * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error)795 * if fails.796 */797static struct iscsi_endpoint *iscsi_iser_ep_connect(struct Scsi_Host *shost,798 struct sockaddr *dst_addr,799 int non_blocking)800{801 int err;802 struct iser_conn *iser_conn;803 struct iscsi_endpoint *ep;804 805 ep = iscsi_create_endpoint(0);806 if (!ep)807 return ERR_PTR(-ENOMEM);808 809 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);810 if (!iser_conn) {811 err = -ENOMEM;812 goto failure;813 }814 815 ep->dd_data = iser_conn;816 iser_conn->ep = ep;817 iser_conn_init(iser_conn);818 819 err = iser_connect(iser_conn, NULL, dst_addr, non_blocking);820 if (err)821 goto failure;822 823 return ep;824failure:825 iscsi_destroy_endpoint(ep);826 return ERR_PTR(err);827}828 829/**830 * iscsi_iser_ep_poll() - poll for iser connection establishment to complete831 * @ep: iscsi endpoint (created at ep_connect)832 * @timeout_ms: polling timeout allowed in ms.833 *834 * This routine boils down to waiting for up_completion signaling835 * that cma_id got CONNECTED event.836 *837 * Return: 1 if succeeded in connection establishment, 0 if timeout expired838 * (libiscsi will retry will kick in) or -1 if interrupted by signal839 * or more likely iser connection state transitioned to TEMINATING or840 * DOWN during the wait period.841 */842static int iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)843{844 struct iser_conn *iser_conn = ep->dd_data;845 int rc;846 847 rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion,848 msecs_to_jiffies(timeout_ms));849 /* if conn establishment failed, return error code to iscsi */850 if (rc == 0) {851 mutex_lock(&iser_conn->state_mutex);852 if (iser_conn->state == ISER_CONN_TERMINATING ||853 iser_conn->state == ISER_CONN_DOWN)854 rc = -1;855 mutex_unlock(&iser_conn->state_mutex);856 }857 858 iser_info("iser conn %p rc = %d\n", iser_conn, rc);859 860 if (rc > 0)861 return 1; /* success, this is the equivalent of EPOLLOUT */862 else if (!rc)863 return 0; /* timeout */864 else865 return rc; /* signal */866}867 868/**869 * iscsi_iser_ep_disconnect() - Initiate connection teardown process870 * @ep: iscsi endpoint handle871 *872 * This routine is not blocked by iser and RDMA termination process873 * completion as we queue a deffered work for iser/RDMA destruction874 * and cleanup or actually call it immediately in case we didn't pass875 * iscsi conn bind/start stage, thus it is safe.876 */877static void iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)878{879 struct iser_conn *iser_conn = ep->dd_data;880 881 iser_info("ep %p iser conn %p\n", ep, iser_conn);882 883 mutex_lock(&iser_conn->state_mutex);884 iser_conn_terminate(iser_conn);885 886 /*887 * if iser_conn and iscsi_conn are bound, we must wait for888 * iscsi_conn_stop and flush errors completion before freeing889 * the iser resources. Otherwise we are safe to free resources890 * immediately.891 */892 if (iser_conn->iscsi_conn) {893 INIT_WORK(&iser_conn->release_work, iser_release_work);894 queue_work(release_wq, &iser_conn->release_work);895 mutex_unlock(&iser_conn->state_mutex);896 } else {897 iser_conn->state = ISER_CONN_DOWN;898 mutex_unlock(&iser_conn->state_mutex);899 iser_conn_release(iser_conn);900 }901 902 iscsi_destroy_endpoint(ep);903}904 905static umode_t iser_attr_is_visible(int param_type, int param)906{907 switch (param_type) {908 case ISCSI_HOST_PARAM:909 switch (param) {910 case ISCSI_HOST_PARAM_NETDEV_NAME:911 case ISCSI_HOST_PARAM_HWADDRESS:912 case ISCSI_HOST_PARAM_INITIATOR_NAME:913 return S_IRUGO;914 default:915 return 0;916 }917 case ISCSI_PARAM:918 switch (param) {919 case ISCSI_PARAM_MAX_RECV_DLENGTH:920 case ISCSI_PARAM_MAX_XMIT_DLENGTH:921 case ISCSI_PARAM_HDRDGST_EN:922 case ISCSI_PARAM_DATADGST_EN:923 case ISCSI_PARAM_CONN_ADDRESS:924 case ISCSI_PARAM_CONN_PORT:925 case ISCSI_PARAM_EXP_STATSN:926 case ISCSI_PARAM_PERSISTENT_ADDRESS:927 case ISCSI_PARAM_PERSISTENT_PORT:928 case ISCSI_PARAM_PING_TMO:929 case ISCSI_PARAM_RECV_TMO:930 case ISCSI_PARAM_INITIAL_R2T_EN:931 case ISCSI_PARAM_MAX_R2T:932 case ISCSI_PARAM_IMM_DATA_EN:933 case ISCSI_PARAM_FIRST_BURST:934 case ISCSI_PARAM_MAX_BURST:935 case ISCSI_PARAM_PDU_INORDER_EN:936 case ISCSI_PARAM_DATASEQ_INORDER_EN:937 case ISCSI_PARAM_TARGET_NAME:938 case ISCSI_PARAM_TPGT:939 case ISCSI_PARAM_USERNAME:940 case ISCSI_PARAM_PASSWORD:941 case ISCSI_PARAM_USERNAME_IN:942 case ISCSI_PARAM_PASSWORD_IN:943 case ISCSI_PARAM_FAST_ABORT:944 case ISCSI_PARAM_ABORT_TMO:945 case ISCSI_PARAM_LU_RESET_TMO:946 case ISCSI_PARAM_TGT_RESET_TMO:947 case ISCSI_PARAM_IFACE_NAME:948 case ISCSI_PARAM_INITIATOR_NAME:949 case ISCSI_PARAM_DISCOVERY_SESS:950 return S_IRUGO;951 default:952 return 0;953 }954 }955 956 return 0;957}958 959static const struct scsi_host_template iscsi_iser_sht = {960 .module = THIS_MODULE,961 .name = "iSCSI Initiator over iSER",962 .queuecommand = iscsi_queuecommand,963 .change_queue_depth = scsi_change_queue_depth,964 .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE,965 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,966 .eh_timed_out = iscsi_eh_cmd_timed_out,967 .eh_abort_handler = iscsi_eh_abort,968 .eh_device_reset_handler= iscsi_eh_device_reset,969 .eh_target_reset_handler = iscsi_eh_recover_target,970 .target_alloc = iscsi_target_alloc,971 .proc_name = "iscsi_iser",972 .this_id = -1,973 .track_queue_depth = 1,974 .cmd_size = sizeof(struct iscsi_cmd),975};976 977static struct iscsi_transport iscsi_iser_transport = {978 .owner = THIS_MODULE,979 .name = "iser",980 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,981 /* session management */982 .create_session = iscsi_iser_session_create,983 .destroy_session = iscsi_iser_session_destroy,984 /* connection management */985 .create_conn = iscsi_iser_conn_create,986 .bind_conn = iscsi_iser_conn_bind,987 .unbind_conn = iscsi_conn_unbind,988 .destroy_conn = iscsi_conn_teardown,989 .attr_is_visible = iser_attr_is_visible,990 .set_param = iscsi_iser_set_param,991 .get_conn_param = iscsi_conn_get_param,992 .get_ep_param = iscsi_iser_get_ep_param,993 .get_session_param = iscsi_session_get_param,994 .start_conn = iscsi_iser_conn_start,995 .stop_conn = iscsi_iser_conn_stop,996 /* iscsi host params */997 .get_host_param = iscsi_host_get_param,998 .set_host_param = iscsi_host_set_param,999 /* IO */1000 .send_pdu = iscsi_conn_send_pdu,1001 .get_stats = iscsi_iser_conn_get_stats,1002 .init_task = iscsi_iser_task_init,1003 .xmit_task = iscsi_iser_task_xmit,1004 .cleanup_task = iscsi_iser_cleanup_task,1005 .alloc_pdu = iscsi_iser_pdu_alloc,1006 .check_protection = iscsi_iser_check_protection,1007 /* recovery */1008 .session_recovery_timedout = iscsi_session_recovery_timedout,1009 1010 .ep_connect = iscsi_iser_ep_connect,1011 .ep_poll = iscsi_iser_ep_poll,1012 .ep_disconnect = iscsi_iser_ep_disconnect1013};1014 1015static int __init iser_init(void)1016{1017 int err;1018 1019 iser_dbg("Starting iSER datamover...\n");1020 1021 memset(&ig, 0, sizeof(struct iser_global));1022 1023 ig.desc_cache = kmem_cache_create("iser_descriptors",1024 sizeof(struct iser_tx_desc),1025 0, SLAB_HWCACHE_ALIGN,1026 NULL);1027 if (ig.desc_cache == NULL)1028 return -ENOMEM;1029 1030 /* device init is called only after the first addr resolution */1031 mutex_init(&ig.device_list_mutex);1032 INIT_LIST_HEAD(&ig.device_list);1033 mutex_init(&ig.connlist_mutex);1034 INIT_LIST_HEAD(&ig.connlist);1035 1036 release_wq = alloc_workqueue("release workqueue", 0, 0);1037 if (!release_wq) {1038 iser_err("failed to allocate release workqueue\n");1039 err = -ENOMEM;1040 goto err_alloc_wq;1041 }1042 1043 iscsi_iser_scsi_transport = iscsi_register_transport(1044 &iscsi_iser_transport);1045 if (!iscsi_iser_scsi_transport) {1046 iser_err("iscsi_register_transport failed\n");1047 err = -EINVAL;1048 goto err_reg;1049 }1050 1051 return 0;1052 1053err_reg:1054 destroy_workqueue(release_wq);1055err_alloc_wq:1056 kmem_cache_destroy(ig.desc_cache);1057 1058 return err;1059}1060 1061static void __exit iser_exit(void)1062{1063 struct iser_conn *iser_conn, *n;1064 int connlist_empty;1065 1066 iser_dbg("Removing iSER datamover...\n");1067 destroy_workqueue(release_wq);1068 1069 mutex_lock(&ig.connlist_mutex);1070 connlist_empty = list_empty(&ig.connlist);1071 mutex_unlock(&ig.connlist_mutex);1072 1073 if (!connlist_empty) {1074 iser_err("Error cleanup stage completed but we still have iser "1075 "connections, destroying them anyway\n");1076 list_for_each_entry_safe(iser_conn, n, &ig.connlist,1077 conn_list) {1078 iser_conn_release(iser_conn);1079 }1080 }1081 1082 iscsi_unregister_transport(&iscsi_iser_transport);1083 kmem_cache_destroy(ig.desc_cache);1084}1085 1086module_init(iser_init);1087module_exit(iser_exit);1088