2 * iSCSI Initiator over iSER Data-Path
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
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:
17 * Redistribution and use in source and binary forms, with or
18 * without modification, are permitted provided that the following
21 * - Redistributions of source code must retain the above
22 * copyright notice, this list of conditions and the following
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.
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
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>
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>
65 #include <linux/uaccess.h>
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>
75 #include "iscsi_iser.h"
77 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
78 MODULE_LICENSE("Dual BSD/GPL");
79 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
81 static struct scsi_host_template iscsi_iser_sht;
82 static struct iscsi_transport iscsi_iser_transport;
83 static struct scsi_transport_template *iscsi_iser_scsi_transport;
84 static struct workqueue_struct *release_wq;
85 static DEFINE_MUTEX(unbind_iser_conn_mutex);
86 struct iser_global ig;
88 int iser_debug_level = 0;
89 module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR);
90 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
92 static int iscsi_iser_set(const char *val, const struct kernel_param *kp);
93 static const struct kernel_param_ops iscsi_iser_size_ops = {
94 .set = iscsi_iser_set,
95 .get = param_get_uint,
98 static unsigned int iscsi_max_lun = 512;
99 module_param_cb(max_lun, &iscsi_iser_size_ops, &iscsi_max_lun, S_IRUGO);
100 MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session, should > 0 (default:512)");
102 unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS;
103 module_param_cb(max_sectors, &iscsi_iser_size_ops, &iser_max_sectors,
105 MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command, should > 0 (default:1024)");
107 bool iser_always_reg = true;
108 module_param_named(always_register, iser_always_reg, bool, S_IRUGO);
109 MODULE_PARM_DESC(always_register,
110 "Always register memory, even for continuous memory regions (default:true)");
112 bool iser_pi_enable = false;
113 module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO);
114 MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
117 module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO);
118 MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]");
120 static int iscsi_iser_set(const char *val, const struct kernel_param *kp)
125 ret = kstrtouint(val, 10, &n);
126 if (ret != 0 || n == 0)
129 return param_set_uint(val, kp);
133 * iscsi_iser_recv() - Process a successful recv completion
134 * @conn: iscsi connection
136 * @rx_data: buffer containing receive data payload
137 * @rx_data_len: length of rx_data
139 * Notes: In case of data length errors or iscsi PDU completion failures
140 * this routine will signal iscsi layer of connection failure.
143 iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
144 char *rx_data, int rx_data_len)
149 /* verify PDU length */
150 datalen = ntoh24(hdr->dlength);
151 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
152 iser_err("wrong datalen %d (hdr), %d (IB)\n",
153 datalen, rx_data_len);
154 rc = ISCSI_ERR_DATALEN;
158 if (datalen != rx_data_len)
159 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
160 datalen, rx_data_len);
162 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
163 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
168 iscsi_conn_failure(conn, rc);
172 * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU
174 * @opcode: iscsi command opcode
176 * Netes: This routine can't fail, just assign iscsi task
177 * hdr and max hdr size.
180 iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
182 struct iscsi_iser_task *iser_task = task->dd_data;
184 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
185 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
191 * iser_initialize_task_headers() - Initialize task headers
193 * @tx_desc: iser tx descriptor
196 * This routine may race with iser teardown flow for scsi
197 * error handling TMFs. So for TMF we should acquire the
198 * state mutex to avoid dereferencing the IB device which
199 * may have already been terminated.
202 iser_initialize_task_headers(struct iscsi_task *task,
203 struct iser_tx_desc *tx_desc)
205 struct iser_conn *iser_conn = task->conn->dd_data;
206 struct iser_device *device = iser_conn->ib_conn.device;
207 struct iscsi_iser_task *iser_task = task->dd_data;
210 if (unlikely(iser_conn->state != ISER_CONN_UP))
213 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
214 ISER_HEADERS_LEN, DMA_TO_DEVICE);
215 if (ib_dma_mapping_error(device->ib_device, dma_addr))
218 tx_desc->inv_wr.next = NULL;
219 tx_desc->reg_wr.wr.next = NULL;
220 tx_desc->mapped = true;
221 tx_desc->dma_addr = dma_addr;
222 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
223 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
224 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
226 iser_task->iser_conn = iser_conn;
232 * iscsi_iser_task_init() - Initialize iscsi-iser task
235 * Initialize the task for the scsi command or mgmt command.
237 * Return: Returns zero on success or -ENOMEM when failing
238 * to init task headers (dma mapping error).
241 iscsi_iser_task_init(struct iscsi_task *task)
243 struct iscsi_iser_task *iser_task = task->dd_data;
246 ret = iser_initialize_task_headers(task, &iser_task->desc);
248 iser_err("Failed to init task %p, err = %d\n",
257 iser_task->command_sent = 0;
258 iser_task_rdma_init(iser_task);
259 iser_task->sc = task->sc;
265 * iscsi_iser_mtask_xmit() - xmit management (immediate) task
266 * @conn: iscsi connection
267 * @task: task management task
270 * The function can return -EAGAIN in which case caller must
271 * call it again later, or recover. '0' return code means successful
276 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
280 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
282 error = iser_send_control(conn, task);
284 /* since iser xmits control with zero copy, tasks can not be recycled
285 * right after sending them.
286 * The recycling scheme is based on whether a response is expected
287 * - if yes, the task is recycled at iscsi_complete_pdu
288 * - if no, the task is recycled at iser_snd_completion
294 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
295 struct iscsi_task *task)
297 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
298 struct iscsi_data hdr;
301 /* Send data-out PDUs while there's still unsolicited data to send */
302 while (iscsi_task_has_unsol_data(task)) {
303 iscsi_prep_data_out_pdu(task, r2t, &hdr);
304 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
305 hdr.itt, r2t->data_count);
307 /* the buffer description has been passed with the command */
308 /* Send the command */
309 error = iser_send_data_out(conn, task, &hdr);
312 goto iscsi_iser_task_xmit_unsol_data_exit;
314 r2t->sent += r2t->data_count;
315 iser_dbg("Need to send %d more as data-out PDUs\n",
316 r2t->data_length - r2t->sent);
319 iscsi_iser_task_xmit_unsol_data_exit:
324 * iscsi_iser_task_xmit() - xmit iscsi-iser task
327 * Return: zero on success or escalates $error on failure.
330 iscsi_iser_task_xmit(struct iscsi_task *task)
332 struct iscsi_conn *conn = task->conn;
333 struct iscsi_iser_task *iser_task = task->dd_data;
337 return iscsi_iser_mtask_xmit(conn, task);
339 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
340 BUG_ON(scsi_bufflen(task->sc) == 0);
342 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
343 task->itt, scsi_bufflen(task->sc),
344 task->imm_count, task->unsol_r2t.data_length);
347 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
348 conn->id, task->itt);
350 /* Send the cmd PDU */
351 if (!iser_task->command_sent) {
352 error = iser_send_command(conn, task);
354 goto iscsi_iser_task_xmit_exit;
355 iser_task->command_sent = 1;
358 /* Send unsolicited data-out PDU(s) if necessary */
359 if (iscsi_task_has_unsol_data(task))
360 error = iscsi_iser_task_xmit_unsol_data(conn, task);
362 iscsi_iser_task_xmit_exit:
367 * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task
370 * Notes: In case the RDMA device is already NULL (might have
371 * been removed in DEVICE_REMOVAL CM event it will bail-out
372 * without doing dma unmapping.
374 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
376 struct iscsi_iser_task *iser_task = task->dd_data;
377 struct iser_tx_desc *tx_desc = &iser_task->desc;
378 struct iser_conn *iser_conn = task->conn->dd_data;
379 struct iser_device *device = iser_conn->ib_conn.device;
381 /* DEVICE_REMOVAL event might have already released the device */
385 if (likely(tx_desc->mapped)) {
386 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
387 ISER_HEADERS_LEN, DMA_TO_DEVICE);
388 tx_desc->mapped = false;
391 /* mgmt tasks do not need special cleanup */
395 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
396 iser_task->status = ISER_TASK_STATUS_COMPLETED;
397 iser_task_rdma_finalize(iser_task);
402 * iscsi_iser_check_protection() - check protection information status of task.
404 * @sector: error sector if exsists (output)
406 * Return: zero if no data-integrity errors have occured
407 * 0x1: data-integrity error occured in the guard-block
408 * 0x2: data-integrity error occured in the reference tag
409 * 0x3: data-integrity error occured in the application tag
411 * In addition the error sector is marked.
414 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
416 struct iscsi_iser_task *iser_task = task->dd_data;
417 enum iser_data_dir dir = iser_task->dir[ISER_DIR_IN] ?
418 ISER_DIR_IN : ISER_DIR_OUT;
420 return iser_check_task_pi_status(iser_task, dir, sector);
424 * iscsi_iser_conn_create() - create a new iscsi-iser connection
425 * @cls_session: iscsi class connection
426 * @conn_idx: connection index within the session (for MCS)
428 * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL
431 static struct iscsi_cls_conn *
432 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session,
435 struct iscsi_conn *conn;
436 struct iscsi_cls_conn *cls_conn;
438 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
441 conn = cls_conn->dd_data;
444 * due to issues with the login code re iser sematics
445 * this not set in iscsi_conn_setup - FIXME
447 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
453 * iscsi_iser_conn_bind() - bind iscsi and iser connection structures
454 * @cls_session: iscsi class session
455 * @cls_conn: iscsi class connection
456 * @transport_eph: transport end-point handle
457 * @is_leading: indicate if this is the session leading connection (MCS)
459 * Return: zero on success, $error if iscsi_conn_bind fails and
460 * -EINVAL in case end-point doesn't exsits anymore or iser connection
461 * state is not UP (teardown already started).
464 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
465 struct iscsi_cls_conn *cls_conn,
466 uint64_t transport_eph,
469 struct iscsi_conn *conn = cls_conn->dd_data;
470 struct iser_conn *iser_conn;
471 struct iscsi_endpoint *ep;
474 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
478 /* the transport ep handle comes from user space so it must be
479 * verified against the global ib connections list */
480 ep = iscsi_lookup_endpoint(transport_eph);
482 iser_err("can't bind eph %llx\n",
483 (unsigned long long)transport_eph);
486 iser_conn = ep->dd_data;
488 mutex_lock(&iser_conn->state_mutex);
489 if (iser_conn->state != ISER_CONN_UP) {
491 iser_err("iser_conn %p state is %d, teardown started\n",
492 iser_conn, iser_conn->state);
496 error = iser_alloc_rx_descriptors(iser_conn, conn->session);
500 /* binds the iSER connection retrieved from the previously
501 * connected ep_handle to the iSCSI layer connection. exchanges
502 * connection pointers */
503 iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn);
505 conn->dd_data = iser_conn;
506 iser_conn->iscsi_conn = conn;
509 mutex_unlock(&iser_conn->state_mutex);
514 * iscsi_iser_conn_start() - start iscsi-iser connection
515 * @cls_conn: iscsi class connection
517 * Notes: Here iser intialize (or re-initialize) stop_completion as
518 * from this point iscsi must call conn_stop in session/connection
519 * teardown so iser transport must wait for it.
522 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
524 struct iscsi_conn *iscsi_conn;
525 struct iser_conn *iser_conn;
527 iscsi_conn = cls_conn->dd_data;
528 iser_conn = iscsi_conn->dd_data;
529 reinit_completion(&iser_conn->stop_completion);
531 return iscsi_conn_start(cls_conn);
535 * iscsi_iser_conn_stop() - stop iscsi-iser connection
536 * @cls_conn: iscsi class connection
537 * @flag: indicate if recover or terminate (passed as is)
539 * Notes: Calling iscsi_conn_stop might theoretically race with
540 * DEVICE_REMOVAL event and dereference a previously freed RDMA device
541 * handle, so we call it under iser the state lock to protect against
545 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
547 struct iscsi_conn *conn = cls_conn->dd_data;
548 struct iser_conn *iser_conn = conn->dd_data;
550 iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);
553 * Userspace may have goofed up and not bound the connection or
554 * might have only partially setup the connection.
557 mutex_lock(&iser_conn->state_mutex);
558 mutex_lock(&unbind_iser_conn_mutex);
559 iser_conn_terminate(iser_conn);
560 iscsi_conn_stop(cls_conn, flag);
563 iser_conn->iscsi_conn = NULL;
564 conn->dd_data = NULL;
565 mutex_unlock(&unbind_iser_conn_mutex);
567 complete(&iser_conn->stop_completion);
568 mutex_unlock(&iser_conn->state_mutex);
570 iscsi_conn_stop(cls_conn, flag);
575 * iscsi_iser_session_destroy() - destroy iscsi-iser session
576 * @cls_session: iscsi class session
578 * Removes and free iscsi host.
581 iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
583 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
585 iscsi_session_teardown(cls_session);
586 iscsi_host_remove(shost);
587 iscsi_host_free(shost);
590 static inline unsigned int
591 iser_dif_prot_caps(int prot_caps)
595 if (prot_caps & IB_PROT_T10DIF_TYPE_1)
596 ret |= SHOST_DIF_TYPE1_PROTECTION |
597 SHOST_DIX_TYPE0_PROTECTION |
598 SHOST_DIX_TYPE1_PROTECTION;
599 if (prot_caps & IB_PROT_T10DIF_TYPE_2)
600 ret |= SHOST_DIF_TYPE2_PROTECTION |
601 SHOST_DIX_TYPE2_PROTECTION;
602 if (prot_caps & IB_PROT_T10DIF_TYPE_3)
603 ret |= SHOST_DIF_TYPE3_PROTECTION |
604 SHOST_DIX_TYPE3_PROTECTION;
610 * iscsi_iser_session_create() - create an iscsi-iser session
611 * @ep: iscsi end-point handle
612 * @cmds_max: maximum commands in this session
613 * @qdepth: session command queue depth
614 * @initial_cmdsn: initiator command sequnce number
616 * Allocates and adds a scsi host, expose DIF supprot if
617 * exists, and sets up an iscsi session.
619 static struct iscsi_cls_session *
620 iscsi_iser_session_create(struct iscsi_endpoint *ep,
621 uint16_t cmds_max, uint16_t qdepth,
622 uint32_t initial_cmdsn)
624 struct iscsi_cls_session *cls_session;
625 struct Scsi_Host *shost;
626 struct iser_conn *iser_conn = NULL;
627 struct ib_conn *ib_conn;
628 struct ib_device *ib_dev;
631 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
634 shost->transportt = iscsi_iser_scsi_transport;
635 shost->cmd_per_lun = qdepth;
636 shost->max_lun = iscsi_max_lun;
638 shost->max_channel = 0;
639 shost->max_cmd_len = 16;
642 * older userspace tools (before 2.0-870) did not pass us
643 * the leading conn's ep so this will be NULL;
646 iser_conn = ep->dd_data;
647 shost->sg_tablesize = iser_conn->scsi_sg_tablesize;
648 shost->can_queue = min_t(u16, cmds_max, iser_conn->max_cmds);
650 mutex_lock(&iser_conn->state_mutex);
651 if (iser_conn->state != ISER_CONN_UP) {
652 iser_err("iser conn %p already started teardown\n",
654 mutex_unlock(&iser_conn->state_mutex);
658 ib_conn = &iser_conn->ib_conn;
659 ib_dev = ib_conn->device->ib_device;
660 if (ib_conn->pi_support) {
661 u32 sig_caps = ib_dev->attrs.sig_prot_cap;
663 shost->sg_prot_tablesize = shost->sg_tablesize;
664 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
665 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |
666 SHOST_DIX_GUARD_CRC);
669 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG))
670 shost->virt_boundary_mask = SZ_4K - 1;
672 if (iscsi_host_add(shost, ib_dev->dev.parent)) {
673 mutex_unlock(&iser_conn->state_mutex);
676 mutex_unlock(&iser_conn->state_mutex);
678 shost->can_queue = min_t(u16, cmds_max, ISER_DEF_XMIT_CMDS_MAX);
679 if (iscsi_host_add(shost, NULL))
683 max_fr_sectors = (shost->sg_tablesize * PAGE_SIZE) >> 9;
684 shost->max_sectors = min(iser_max_sectors, max_fr_sectors);
686 iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n",
687 iser_conn, shost->sg_tablesize,
690 if (shost->max_sectors < iser_max_sectors)
691 iser_warn("max_sectors was reduced from %u to %u\n",
692 iser_max_sectors, shost->max_sectors);
694 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
696 sizeof(struct iscsi_iser_task),
704 iscsi_host_remove(shost);
706 iscsi_host_free(shost);
711 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
712 enum iscsi_param param, char *buf, int buflen)
717 case ISCSI_PARAM_MAX_RECV_DLENGTH:
720 case ISCSI_PARAM_HDRDGST_EN:
721 sscanf(buf, "%d", &value);
723 iser_err("DataDigest wasn't negotiated to None\n");
727 case ISCSI_PARAM_DATADGST_EN:
728 sscanf(buf, "%d", &value);
730 iser_err("DataDigest wasn't negotiated to None\n");
734 case ISCSI_PARAM_IFMARKER_EN:
735 sscanf(buf, "%d", &value);
737 iser_err("IFMarker wasn't negotiated to No\n");
741 case ISCSI_PARAM_OFMARKER_EN:
742 sscanf(buf, "%d", &value);
744 iser_err("OFMarker wasn't negotiated to No\n");
749 return iscsi_set_param(cls_conn, param, buf, buflen);
756 * iscsi_iser_conn_get_stats() - get iscsi connection statistics
757 * @cls_conn: iscsi class connection
758 * @stats: iscsi stats to output
760 * Output connection statistics.
763 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
765 struct iscsi_conn *conn = cls_conn->dd_data;
767 stats->txdata_octets = conn->txdata_octets;
768 stats->rxdata_octets = conn->rxdata_octets;
769 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
770 stats->dataout_pdus = conn->dataout_pdus_cnt;
771 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
772 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
773 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
774 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
775 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
776 stats->custom_length = 0;
779 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
780 enum iscsi_param param, char *buf)
782 struct iser_conn *iser_conn = ep->dd_data;
785 case ISCSI_PARAM_CONN_PORT:
786 case ISCSI_PARAM_CONN_ADDRESS:
787 if (!iser_conn || !iser_conn->ib_conn.cma_id)
790 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
791 &iser_conn->ib_conn.cma_id->route.addr.dst_addr,
800 * iscsi_iser_ep_connect() - Initiate iSER connection establishment
802 * @dst_addr: destination address
803 * @non_blocking: indicate if routine can block
805 * Allocate an iscsi endpoint, an iser_conn structure and bind them.
806 * After that start RDMA connection establishment via rdma_cm. We
807 * don't allocate iser_conn embedded in iscsi_endpoint since in teardown
808 * the endpoint will be destroyed at ep_disconnect while iser_conn will
809 * cleanup its resources asynchronuously.
811 * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error)
814 static struct iscsi_endpoint *
815 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
819 struct iser_conn *iser_conn;
820 struct iscsi_endpoint *ep;
822 ep = iscsi_create_endpoint(0);
824 return ERR_PTR(-ENOMEM);
826 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
832 ep->dd_data = iser_conn;
834 iser_conn_init(iser_conn);
836 err = iser_connect(iser_conn, NULL, dst_addr, non_blocking);
842 iscsi_destroy_endpoint(ep);
847 * iscsi_iser_ep_poll() - poll for iser connection establishment to complete
848 * @ep: iscsi endpoint (created at ep_connect)
849 * @timeout_ms: polling timeout allowed in ms.
851 * This routine boils down to waiting for up_completion signaling
852 * that cma_id got CONNECTED event.
854 * Return: 1 if succeeded in connection establishment, 0 if timeout expired
855 * (libiscsi will retry will kick in) or -1 if interrupted by signal
856 * or more likely iser connection state transitioned to TEMINATING or
857 * DOWN during the wait period.
860 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
862 struct iser_conn *iser_conn = ep->dd_data;
865 rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion,
866 msecs_to_jiffies(timeout_ms));
867 /* if conn establishment failed, return error code to iscsi */
869 mutex_lock(&iser_conn->state_mutex);
870 if (iser_conn->state == ISER_CONN_TERMINATING ||
871 iser_conn->state == ISER_CONN_DOWN)
873 mutex_unlock(&iser_conn->state_mutex);
876 iser_info("iser conn %p rc = %d\n", iser_conn, rc);
879 return 1; /* success, this is the equivalent of EPOLLOUT */
881 return 0; /* timeout */
883 return rc; /* signal */
887 * iscsi_iser_ep_disconnect() - Initiate connection teardown process
888 * @ep: iscsi endpoint handle
890 * This routine is not blocked by iser and RDMA termination process
891 * completion as we queue a deffered work for iser/RDMA destruction
892 * and cleanup or actually call it immediately in case we didn't pass
893 * iscsi conn bind/start stage, thus it is safe.
896 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
898 struct iser_conn *iser_conn = ep->dd_data;
900 iser_info("ep %p iser conn %p\n", ep, iser_conn);
902 mutex_lock(&iser_conn->state_mutex);
903 iser_conn_terminate(iser_conn);
906 * if iser_conn and iscsi_conn are bound, we must wait for
907 * iscsi_conn_stop and flush errors completion before freeing
908 * the iser resources. Otherwise we are safe to free resources
911 if (iser_conn->iscsi_conn) {
912 INIT_WORK(&iser_conn->release_work, iser_release_work);
913 queue_work(release_wq, &iser_conn->release_work);
914 mutex_unlock(&iser_conn->state_mutex);
916 iser_conn->state = ISER_CONN_DOWN;
917 mutex_unlock(&iser_conn->state_mutex);
918 iser_conn_release(iser_conn);
921 iscsi_destroy_endpoint(ep);
924 static umode_t iser_attr_is_visible(int param_type, int param)
926 switch (param_type) {
927 case ISCSI_HOST_PARAM:
929 case ISCSI_HOST_PARAM_NETDEV_NAME:
930 case ISCSI_HOST_PARAM_HWADDRESS:
931 case ISCSI_HOST_PARAM_INITIATOR_NAME:
938 case ISCSI_PARAM_MAX_RECV_DLENGTH:
939 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
940 case ISCSI_PARAM_HDRDGST_EN:
941 case ISCSI_PARAM_DATADGST_EN:
942 case ISCSI_PARAM_CONN_ADDRESS:
943 case ISCSI_PARAM_CONN_PORT:
944 case ISCSI_PARAM_EXP_STATSN:
945 case ISCSI_PARAM_PERSISTENT_ADDRESS:
946 case ISCSI_PARAM_PERSISTENT_PORT:
947 case ISCSI_PARAM_PING_TMO:
948 case ISCSI_PARAM_RECV_TMO:
949 case ISCSI_PARAM_INITIAL_R2T_EN:
950 case ISCSI_PARAM_MAX_R2T:
951 case ISCSI_PARAM_IMM_DATA_EN:
952 case ISCSI_PARAM_FIRST_BURST:
953 case ISCSI_PARAM_MAX_BURST:
954 case ISCSI_PARAM_PDU_INORDER_EN:
955 case ISCSI_PARAM_DATASEQ_INORDER_EN:
956 case ISCSI_PARAM_TARGET_NAME:
957 case ISCSI_PARAM_TPGT:
958 case ISCSI_PARAM_USERNAME:
959 case ISCSI_PARAM_PASSWORD:
960 case ISCSI_PARAM_USERNAME_IN:
961 case ISCSI_PARAM_PASSWORD_IN:
962 case ISCSI_PARAM_FAST_ABORT:
963 case ISCSI_PARAM_ABORT_TMO:
964 case ISCSI_PARAM_LU_RESET_TMO:
965 case ISCSI_PARAM_TGT_RESET_TMO:
966 case ISCSI_PARAM_IFACE_NAME:
967 case ISCSI_PARAM_INITIATOR_NAME:
968 case ISCSI_PARAM_DISCOVERY_SESS:
978 static struct scsi_host_template iscsi_iser_sht = {
979 .module = THIS_MODULE,
980 .name = "iSCSI Initiator over iSER",
981 .queuecommand = iscsi_queuecommand,
982 .change_queue_depth = scsi_change_queue_depth,
983 .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE,
984 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
985 .eh_timed_out = iscsi_eh_cmd_timed_out,
986 .eh_abort_handler = iscsi_eh_abort,
987 .eh_device_reset_handler= iscsi_eh_device_reset,
988 .eh_target_reset_handler = iscsi_eh_recover_target,
989 .target_alloc = iscsi_target_alloc,
990 .proc_name = "iscsi_iser",
992 .track_queue_depth = 1,
995 static struct iscsi_transport iscsi_iser_transport = {
996 .owner = THIS_MODULE,
998 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
999 /* session management */
1000 .create_session = iscsi_iser_session_create,
1001 .destroy_session = iscsi_iser_session_destroy,
1002 /* connection management */
1003 .create_conn = iscsi_iser_conn_create,
1004 .bind_conn = iscsi_iser_conn_bind,
1005 .destroy_conn = iscsi_conn_teardown,
1006 .attr_is_visible = iser_attr_is_visible,
1007 .set_param = iscsi_iser_set_param,
1008 .get_conn_param = iscsi_conn_get_param,
1009 .get_ep_param = iscsi_iser_get_ep_param,
1010 .get_session_param = iscsi_session_get_param,
1011 .start_conn = iscsi_iser_conn_start,
1012 .stop_conn = iscsi_iser_conn_stop,
1013 /* iscsi host params */
1014 .get_host_param = iscsi_host_get_param,
1015 .set_host_param = iscsi_host_set_param,
1017 .send_pdu = iscsi_conn_send_pdu,
1018 .get_stats = iscsi_iser_conn_get_stats,
1019 .init_task = iscsi_iser_task_init,
1020 .xmit_task = iscsi_iser_task_xmit,
1021 .cleanup_task = iscsi_iser_cleanup_task,
1022 .alloc_pdu = iscsi_iser_pdu_alloc,
1023 .check_protection = iscsi_iser_check_protection,
1025 .session_recovery_timedout = iscsi_session_recovery_timedout,
1027 .ep_connect = iscsi_iser_ep_connect,
1028 .ep_poll = iscsi_iser_ep_poll,
1029 .ep_disconnect = iscsi_iser_ep_disconnect
1032 static int __init iser_init(void)
1036 iser_dbg("Starting iSER datamover...\n");
1038 memset(&ig, 0, sizeof(struct iser_global));
1040 ig.desc_cache = kmem_cache_create("iser_descriptors",
1041 sizeof(struct iser_tx_desc),
1042 0, SLAB_HWCACHE_ALIGN,
1044 if (ig.desc_cache == NULL)
1047 /* device init is called only after the first addr resolution */
1048 mutex_init(&ig.device_list_mutex);
1049 INIT_LIST_HEAD(&ig.device_list);
1050 mutex_init(&ig.connlist_mutex);
1051 INIT_LIST_HEAD(&ig.connlist);
1053 release_wq = alloc_workqueue("release workqueue", 0, 0);
1055 iser_err("failed to allocate release workqueue\n");
1060 iscsi_iser_scsi_transport = iscsi_register_transport(
1061 &iscsi_iser_transport);
1062 if (!iscsi_iser_scsi_transport) {
1063 iser_err("iscsi_register_transport failed\n");
1071 destroy_workqueue(release_wq);
1073 kmem_cache_destroy(ig.desc_cache);
1078 static void __exit iser_exit(void)
1080 struct iser_conn *iser_conn, *n;
1083 iser_dbg("Removing iSER datamover...\n");
1084 destroy_workqueue(release_wq);
1086 mutex_lock(&ig.connlist_mutex);
1087 connlist_empty = list_empty(&ig.connlist);
1088 mutex_unlock(&ig.connlist_mutex);
1090 if (!connlist_empty) {
1091 iser_err("Error cleanup stage completed but we still have iser "
1092 "connections, destroying them anyway\n");
1093 list_for_each_entry_safe(iser_conn, n, &ig.connlist,
1095 iser_conn_release(iser_conn);
1099 iscsi_unregister_transport(&iscsi_iser_transport);
1100 kmem_cache_destroy(ig.desc_cache);
1103 module_init(iser_init);
1104 module_exit(iser_exit);