1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <target/target_core_base.h>
29 #include <target/target_core_tmr.h>
30 #include <target/target_core_transport.h>
32 #include "iscsi_target_core.h"
33 #include "iscsi_target_parameters.h"
34 #include "iscsi_target_seq_pdu_list.h"
35 #include "iscsi_target_tq.h"
36 #include "iscsi_target_configfs.h"
37 #include "iscsi_target_datain_values.h"
38 #include "iscsi_target_erl0.h"
39 #include "iscsi_target_erl1.h"
40 #include "iscsi_target_erl2.h"
41 #include "iscsi_target_login.h"
42 #include "iscsi_target_tmr.h"
43 #include "iscsi_target_tpg.h"
44 #include "iscsi_target_util.h"
45 #include "iscsi_target.h"
46 #include "iscsi_target_device.h"
47 #include "iscsi_target_stat.h"
49 static LIST_HEAD(g_tiqn_list);
50 static LIST_HEAD(g_np_list);
51 static DEFINE_SPINLOCK(tiqn_lock);
52 static DEFINE_SPINLOCK(np_lock);
54 static struct idr tiqn_idr;
56 struct mutex auth_id_lock;
57 spinlock_t sess_idr_lock;
59 struct iscsit_global *iscsit_global;
61 struct kmem_cache *lio_cmd_cache;
62 struct kmem_cache *lio_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 unsigned char *buf, u32);
69 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
71 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
73 struct iscsi_tiqn *tiqn = NULL;
75 spin_lock(&tiqn_lock);
76 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
77 if (!strcmp(tiqn->tiqn, buf)) {
79 spin_lock(&tiqn->tiqn_state_lock);
80 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
81 tiqn->tiqn_access_count++;
82 spin_unlock(&tiqn->tiqn_state_lock);
83 spin_unlock(&tiqn_lock);
86 spin_unlock(&tiqn->tiqn_state_lock);
89 spin_unlock(&tiqn_lock);
94 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
96 spin_lock(&tiqn->tiqn_state_lock);
97 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
98 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
99 spin_unlock(&tiqn->tiqn_state_lock);
102 spin_unlock(&tiqn->tiqn_state_lock);
107 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
109 spin_lock(&tiqn->tiqn_state_lock);
110 tiqn->tiqn_access_count--;
111 spin_unlock(&tiqn->tiqn_state_lock);
115 * Note that IQN formatting is expected to be done in userspace, and
116 * no explict IQN format checks are done here.
118 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
120 struct iscsi_tiqn *tiqn = NULL;
123 if (strlen(buf) >= ISCSI_IQN_LEN) {
124 pr_err("Target IQN exceeds %d bytes\n",
126 return ERR_PTR(-EINVAL);
129 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
131 pr_err("Unable to allocate struct iscsi_tiqn\n");
132 return ERR_PTR(-ENOMEM);
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
144 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
145 pr_err("idr_pre_get() for tiqn_idr failed\n");
147 return ERR_PTR(-ENOMEM);
149 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
151 spin_lock(&tiqn_lock);
152 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
154 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
155 spin_unlock(&tiqn_lock);
159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160 spin_unlock(&tiqn_lock);
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
171 * Wait for accesses to said struct iscsi_tiqn to end.
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
177 spin_lock(&tiqn->tiqn_state_lock);
179 spin_unlock(&tiqn->tiqn_state_lock);
182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
195 iscsit_wait_for_tiqn(tiqn);
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
211 * Determine if the network portal is accepting storage traffic.
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
218 if (np->np_login_tpg) {
219 pr_err("np->np_login_tpg() is not NULL!\n");
220 spin_unlock_bh(&np->np_thread_lock);
223 spin_unlock_bh(&np->np_thread_lock);
225 * Determine if the portal group is accepting storage traffic.
227 spin_lock_bh(&tpg->tpg_state_lock);
228 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
229 spin_unlock_bh(&tpg->tpg_state_lock);
232 spin_unlock_bh(&tpg->tpg_state_lock);
235 * Here we serialize access across the TIQN+TPG Tuple.
237 ret = mutex_lock_interruptible(&tpg->np_login_lock);
238 if ((ret != 0) || signal_pending(current))
241 spin_lock_bh(&np->np_thread_lock);
242 np->np_login_tpg = tpg;
243 spin_unlock_bh(&np->np_thread_lock);
248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
250 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
252 spin_lock_bh(&np->np_thread_lock);
253 np->np_login_tpg = NULL;
254 spin_unlock_bh(&np->np_thread_lock);
256 mutex_unlock(&tpg->np_login_lock);
259 iscsit_put_tiqn_for_login(tiqn);
264 static struct iscsi_np *iscsit_get_np(
265 struct __kernel_sockaddr_storage *sockaddr,
266 int network_transport)
268 struct sockaddr_in *sock_in, *sock_in_e;
269 struct sockaddr_in6 *sock_in6, *sock_in6_e;
274 spin_lock_bh(&np_lock);
275 list_for_each_entry(np, &g_np_list, np_list) {
276 spin_lock(&np->np_thread_lock);
277 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
278 spin_unlock(&np->np_thread_lock);
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286 if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
287 (void *)&sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
291 port = ntohs(sock_in6->sin6_port);
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296 if (sock_in->sin_addr.s_addr ==
297 sock_in_e->sin_addr.s_addr)
300 port = ntohs(sock_in->sin_port);
303 if ((ip_match == 1) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport)) {
306 * Increment the np_exports reference count now to
307 * prevent iscsit_del_np() below from being called
308 * while iscsi_tpg_add_network_portal() is called.
311 spin_unlock(&np->np_thread_lock);
312 spin_unlock_bh(&np_lock);
315 spin_unlock(&np->np_thread_lock);
317 spin_unlock_bh(&np_lock);
322 struct iscsi_np *iscsit_add_np(
323 struct __kernel_sockaddr_storage *sockaddr,
325 int network_transport)
327 struct sockaddr_in *sock_in;
328 struct sockaddr_in6 *sock_in6;
332 * Locate the existing struct iscsi_np if already active..
334 np = iscsit_get_np(sockaddr, network_transport);
338 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
340 pr_err("Unable to allocate memory for struct iscsi_np\n");
341 return ERR_PTR(-ENOMEM);
344 np->np_flags |= NPF_IP_NETWORK;
345 if (sockaddr->ss_family == AF_INET6) {
346 sock_in6 = (struct sockaddr_in6 *)sockaddr;
347 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
348 np->np_port = ntohs(sock_in6->sin6_port);
350 sock_in = (struct sockaddr_in *)sockaddr;
351 sprintf(np->np_ip, "%s", ip_str);
352 np->np_port = ntohs(sock_in->sin_port);
355 np->np_network_transport = network_transport;
356 spin_lock_init(&np->np_thread_lock);
357 init_completion(&np->np_restart_comp);
358 INIT_LIST_HEAD(&np->np_list);
360 ret = iscsi_target_setup_login_socket(np, sockaddr);
366 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
367 if (IS_ERR(np->np_thread)) {
368 pr_err("Unable to create kthread: iscsi_np\n");
369 ret = PTR_ERR(np->np_thread);
374 * Increment the np_exports reference count now to prevent
375 * iscsit_del_np() below from being run while a new call to
376 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
377 * active. We don't need to hold np->np_thread_lock at this
378 * point because iscsi_np has not been added to g_np_list yet.
382 spin_lock_bh(&np_lock);
383 list_add_tail(&np->np_list, &g_np_list);
384 spin_unlock_bh(&np_lock);
386 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
387 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
393 int iscsit_reset_np_thread(
395 struct iscsi_tpg_np *tpg_np,
396 struct iscsi_portal_group *tpg)
398 spin_lock_bh(&np->np_thread_lock);
401 * The reset operation need only be performed when the
402 * passed struct iscsi_portal_group has a login in progress
403 * to one of the network portals.
405 if (tpg_np->tpg_np->np_login_tpg != tpg) {
406 spin_unlock_bh(&np->np_thread_lock);
410 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
411 spin_unlock_bh(&np->np_thread_lock);
414 np->np_thread_state = ISCSI_NP_THREAD_RESET;
417 spin_unlock_bh(&np->np_thread_lock);
418 send_sig(SIGINT, np->np_thread, 1);
419 wait_for_completion(&np->np_restart_comp);
420 spin_lock_bh(&np->np_thread_lock);
422 spin_unlock_bh(&np->np_thread_lock);
427 int iscsit_del_np_comm(struct iscsi_np *np)
433 * Some network transports allocate their own struct sock->file,
434 * see if we need to free any additional allocated resources.
436 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
437 kfree(np->np_socket->file);
438 np->np_socket->file = NULL;
441 sock_release(np->np_socket);
445 int iscsit_del_np(struct iscsi_np *np)
447 spin_lock_bh(&np->np_thread_lock);
449 if (np->np_exports) {
450 spin_unlock_bh(&np->np_thread_lock);
453 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
454 spin_unlock_bh(&np->np_thread_lock);
458 * We need to send the signal to wakeup Linux/Net
459 * which may be sleeping in sock_accept()..
461 send_sig(SIGINT, np->np_thread, 1);
462 kthread_stop(np->np_thread);
464 iscsit_del_np_comm(np);
466 spin_lock_bh(&np_lock);
467 list_del(&np->np_list);
468 spin_unlock_bh(&np_lock);
470 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
471 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
478 static int __init iscsi_target_init_module(void)
482 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
484 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
485 if (!iscsit_global) {
486 pr_err("Unable to allocate memory for iscsit_global\n");
489 mutex_init(&auth_id_lock);
490 spin_lock_init(&sess_idr_lock);
494 ret = iscsi_target_register_configfs();
498 ret = iscsi_thread_set_init();
502 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
503 TARGET_THREAD_SET_COUNT) {
504 pr_err("iscsi_allocate_thread_sets() returned"
505 " unexpected value!\n");
509 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
510 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
512 if (!lio_cmd_cache) {
513 pr_err("Unable to kmem_cache_create() for"
518 lio_qr_cache = kmem_cache_create("lio_qr_cache",
519 sizeof(struct iscsi_queue_req),
520 __alignof__(struct iscsi_queue_req), 0, NULL);
522 pr_err("nable to kmem_cache_create() for"
527 lio_dr_cache = kmem_cache_create("lio_dr_cache",
528 sizeof(struct iscsi_datain_req),
529 __alignof__(struct iscsi_datain_req), 0, NULL);
531 pr_err("Unable to kmem_cache_create() for"
536 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
537 sizeof(struct iscsi_ooo_cmdsn),
538 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
539 if (!lio_ooo_cache) {
540 pr_err("Unable to kmem_cache_create() for"
545 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
546 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
548 if (!lio_r2t_cache) {
549 pr_err("Unable to kmem_cache_create() for"
554 if (iscsit_load_discovery_tpg() < 0)
559 kmem_cache_destroy(lio_r2t_cache);
561 kmem_cache_destroy(lio_ooo_cache);
563 kmem_cache_destroy(lio_dr_cache);
565 kmem_cache_destroy(lio_qr_cache);
567 kmem_cache_destroy(lio_cmd_cache);
569 iscsi_deallocate_thread_sets();
571 iscsi_thread_set_free();
573 iscsi_target_deregister_configfs();
575 kfree(iscsit_global);
579 static void __exit iscsi_target_cleanup_module(void)
581 iscsi_deallocate_thread_sets();
582 iscsi_thread_set_free();
583 iscsit_release_discovery_tpg();
584 kmem_cache_destroy(lio_cmd_cache);
585 kmem_cache_destroy(lio_qr_cache);
586 kmem_cache_destroy(lio_dr_cache);
587 kmem_cache_destroy(lio_ooo_cache);
588 kmem_cache_destroy(lio_r2t_cache);
590 iscsi_target_deregister_configfs();
592 kfree(iscsit_global);
595 int iscsit_add_reject(
599 struct iscsi_conn *conn)
601 struct iscsi_cmd *cmd;
602 struct iscsi_reject *hdr;
605 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
609 cmd->iscsi_opcode = ISCSI_OP_REJECT;
611 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
613 hdr = (struct iscsi_reject *) cmd->pdu;
614 hdr->reason = reason;
616 cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
618 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
619 iscsit_release_cmd(cmd);
622 memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
624 spin_lock_bh(&conn->cmd_lock);
625 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
626 spin_unlock_bh(&conn->cmd_lock);
628 cmd->i_state = ISTATE_SEND_REJECT;
629 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
631 ret = wait_for_completion_interruptible(&cmd->reject_comp);
635 return (!fail_conn) ? 0 : -1;
638 int iscsit_add_reject_from_cmd(
643 struct iscsi_cmd *cmd)
645 struct iscsi_conn *conn;
646 struct iscsi_reject *hdr;
650 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
656 cmd->iscsi_opcode = ISCSI_OP_REJECT;
658 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
660 hdr = (struct iscsi_reject *) cmd->pdu;
661 hdr->reason = reason;
663 cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
665 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
666 iscsit_release_cmd(cmd);
669 memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
672 spin_lock_bh(&conn->cmd_lock);
673 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
674 spin_unlock_bh(&conn->cmd_lock);
677 cmd->i_state = ISTATE_SEND_REJECT;
678 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
680 ret = wait_for_completion_interruptible(&cmd->reject_comp);
684 return (!fail_conn) ? 0 : -1;
688 * Map some portion of the allocated scatterlist to an iovec, suitable for
689 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
690 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
691 * either case (see iscsit_alloc_buffs)
693 static int iscsit_map_iovec(
694 struct iscsi_cmd *cmd,
700 struct scatterlist *sg;
701 unsigned int page_off;
704 * We have a private mapping of the allocated pages in t_mem_sg.
705 * At this point, we also know each contains a page.
707 sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
708 page_off = (data_offset % PAGE_SIZE);
710 cmd->first_data_sg = sg;
711 cmd->first_data_sg_off = page_off;
713 while (data_length) {
714 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
716 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
717 iov[i].iov_len = cur_len;
719 data_length -= cur_len;
725 cmd->kmapped_nents = i;
730 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
733 struct scatterlist *sg;
735 sg = cmd->first_data_sg;
737 for (i = 0; i < cmd->kmapped_nents; i++)
738 kunmap(sg_page(&sg[i]));
741 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
743 struct iscsi_cmd *cmd;
745 conn->exp_statsn = exp_statsn;
747 spin_lock_bh(&conn->cmd_lock);
748 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
749 spin_lock(&cmd->istate_lock);
750 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
751 (cmd->stat_sn < exp_statsn)) {
752 cmd->i_state = ISTATE_REMOVE;
753 spin_unlock(&cmd->istate_lock);
754 iscsit_add_cmd_to_immediate_queue(cmd, conn,
758 spin_unlock(&cmd->istate_lock);
760 spin_unlock_bh(&conn->cmd_lock);
763 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
765 u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
766 cmd->se_cmd.t_data_nents;
768 iov_count += ISCSI_IOV_DATA_BUFFER;
770 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
771 if (!cmd->iov_data) {
772 pr_err("Unable to allocate cmd->iov_data\n");
776 cmd->orig_iov_data_count = iov_count;
780 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
782 struct scatterlist *sgl;
783 u32 length = cmd->se_cmd.data_length;
784 int nents = DIV_ROUND_UP(length, PAGE_SIZE);
787 * If no SCSI payload is present, allocate the default iovecs used for
791 return iscsit_allocate_iovecs(cmd);
793 sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
797 sg_init_table(sgl, nents);
800 int buf_size = min_t(int, length, PAGE_SIZE);
803 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
805 goto page_alloc_failed;
807 sg_set_page(&sgl[i], page, buf_size, 0);
814 cmd->t_mem_sg_nents = nents;
816 /* BIDI ops not supported */
818 /* Tell the core about our preallocated memory */
819 transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
821 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
822 * so that cmd->se_cmd.t_tasks_se_num has been set.
824 ret = iscsit_allocate_iovecs(cmd);
826 goto page_alloc_failed;
832 __free_page(sg_page(&sgl[i]));
835 kfree(cmd->t_mem_sg);
836 cmd->t_mem_sg = NULL;
840 static int iscsit_handle_scsi_cmd(
841 struct iscsi_conn *conn,
844 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
845 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
846 struct iscsi_cmd *cmd = NULL;
847 struct iscsi_scsi_req *hdr;
849 spin_lock_bh(&conn->sess->session_stats_lock);
850 conn->sess->cmd_pdus++;
851 if (conn->sess->se_sess->se_node_acl) {
852 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
853 conn->sess->se_sess->se_node_acl->num_cmds++;
854 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
856 spin_unlock_bh(&conn->sess->session_stats_lock);
858 hdr = (struct iscsi_scsi_req *) buf;
859 payload_length = ntoh24(hdr->dlength);
860 hdr->itt = be32_to_cpu(hdr->itt);
861 hdr->data_length = be32_to_cpu(hdr->data_length);
862 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
863 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
865 /* FIXME; Add checks for AdditionalHeaderSegment */
867 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
868 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
869 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
870 " not set. Bad iSCSI Initiator.\n");
871 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
875 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
876 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
878 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
879 * that adds support for RESERVE/RELEASE. There is a bug
880 * add with this new functionality that sets R/W bits when
881 * neither CDB carries any READ or WRITE datapayloads.
883 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
884 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
885 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
889 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
890 " set when Expected Data Transfer Length is 0 for"
891 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
892 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
897 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
898 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
899 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
900 " MUST be set if Expected Data Transfer Length is not 0."
901 " Bad iSCSI Initiator\n");
902 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
906 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
907 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
908 pr_err("Bidirectional operations not supported!\n");
909 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
913 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
914 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
915 " Scsi Command PDU.\n");
916 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
920 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
921 pr_err("ImmediateData=No but DataSegmentLength=%u,"
922 " protocol error.\n", payload_length);
923 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
927 if ((hdr->data_length == payload_length) &&
928 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
929 pr_err("Expected Data Transfer Length and Length of"
930 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
931 " bit is not set protocol error\n");
932 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
936 if (payload_length > hdr->data_length) {
937 pr_err("DataSegmentLength: %u is greater than"
938 " EDTL: %u, protocol error.\n", payload_length,
940 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
944 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
945 pr_err("DataSegmentLength: %u is greater than"
946 " MaxRecvDataSegmentLength: %u, protocol error.\n",
947 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
948 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
952 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
953 pr_err("DataSegmentLength: %u is greater than"
954 " FirstBurstLength: %u, protocol error.\n",
955 payload_length, conn->sess->sess_ops->FirstBurstLength);
956 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
960 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
961 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
964 cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
965 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
967 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
970 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
971 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
972 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
974 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
975 cmd->i_state = ISTATE_NEW_CMD;
976 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
977 cmd->immediate_data = (payload_length) ? 1 : 0;
978 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
979 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
980 if (cmd->unsolicited_data)
981 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
983 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
984 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
985 spin_lock_bh(&conn->sess->ttt_lock);
986 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
987 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
988 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
989 spin_unlock_bh(&conn->sess->ttt_lock);
990 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
991 cmd->targ_xfer_tag = 0xFFFFFFFF;
992 cmd->cmd_sn = hdr->cmdsn;
993 cmd->exp_stat_sn = hdr->exp_statsn;
994 cmd->first_burst_len = payload_length;
996 if (cmd->data_direction == DMA_FROM_DEVICE) {
997 struct iscsi_datain_req *dr;
999 dr = iscsit_allocate_datain_req();
1001 return iscsit_add_reject_from_cmd(
1002 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1005 iscsit_attach_datain_req(cmd, dr);
1009 * The CDB is going to an se_device_t.
1011 ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1012 get_unaligned_le64(&hdr->lun));
1014 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1015 pr_debug("Responding to non-acl'ed,"
1016 " non-existent or non-exported iSCSI LUN:"
1017 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1019 if (ret == PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES)
1020 return iscsit_add_reject_from_cmd(
1021 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1024 send_check_condition = 1;
1028 * The Initiator Node has access to the LUN (the addressing method
1029 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1030 * allocate 1->N transport tasks (depending on sector count and
1031 * maximum request size the physical HBA(s) can handle.
1033 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1034 if (transport_ret == -ENOMEM) {
1035 return iscsit_add_reject_from_cmd(
1036 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1038 } else if (transport_ret == -EINVAL) {
1040 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1041 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1044 send_check_condition = 1;
1046 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1047 return iscsit_add_reject_from_cmd(
1048 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1053 spin_lock_bh(&conn->cmd_lock);
1054 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1055 spin_unlock_bh(&conn->cmd_lock);
1057 * Check if we need to delay processing because of ALUA
1058 * Active/NonOptimized primary access state..
1060 core_alua_check_nonop_delay(&cmd->se_cmd);
1062 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1063 * also call iscsit_allocate_iovecs()
1065 ret = iscsit_alloc_buffs(cmd);
1067 return iscsit_add_reject_from_cmd(
1068 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1071 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1072 * the Immediate Bit is not set, and no Immediate
1075 * A PDU/CmdSN carrying Immediate Data can only
1076 * be processed after the DataCRC has passed.
1077 * If the DataCRC fails, the CmdSN MUST NOT
1078 * be acknowledged. (See below)
1080 if (!cmd->immediate_data) {
1081 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1082 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1084 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1085 return iscsit_add_reject_from_cmd(
1086 ISCSI_REASON_PROTOCOL_ERROR,
1090 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1093 * If no Immediate Data is attached, it's OK to return now.
1095 if (!cmd->immediate_data) {
1096 if (send_check_condition)
1099 if (cmd->unsolicited_data) {
1100 iscsit_set_dataout_sequence_values(cmd);
1102 spin_lock_bh(&cmd->dataout_timeout_lock);
1103 iscsit_start_dataout_timer(cmd, cmd->conn);
1104 spin_unlock_bh(&cmd->dataout_timeout_lock);
1111 * Early CHECK_CONDITIONs never make it to the transport processing
1112 * thread. They are processed in CmdSN order by
1113 * iscsit_check_received_cmdsn() below.
1115 if (send_check_condition) {
1116 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1117 dump_immediate_data = 1;
1118 goto after_immediate_data;
1121 * Call directly into transport_generic_new_cmd() to perform
1122 * the backend memory allocation.
1124 ret = transport_generic_new_cmd(&cmd->se_cmd);
1125 if ((ret < 0) || (cmd->se_cmd.se_cmd_flags & SCF_SE_CMD_FAILED)) {
1126 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1127 dump_immediate_data = 1;
1128 goto after_immediate_data;
1131 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1132 after_immediate_data:
1133 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1135 * A PDU/CmdSN carrying Immediate Data passed
1136 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1137 * Immediate Bit is not set.
1139 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1141 * Special case for Unsupported SAM WRITE Opcodes
1142 * and ImmediateData=Yes.
1144 if (dump_immediate_data) {
1145 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1147 } else if (cmd->unsolicited_data) {
1148 iscsit_set_dataout_sequence_values(cmd);
1150 spin_lock_bh(&cmd->dataout_timeout_lock);
1151 iscsit_start_dataout_timer(cmd, cmd->conn);
1152 spin_unlock_bh(&cmd->dataout_timeout_lock);
1155 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1156 return iscsit_add_reject_from_cmd(
1157 ISCSI_REASON_PROTOCOL_ERROR,
1160 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1162 * Immediate Data failed DataCRC and ERL>=1,
1163 * silently drop this PDU and let the initiator
1164 * plug the CmdSN gap.
1166 * FIXME: Send Unsolicited NOPIN with reserved
1167 * TTT here to help the initiator figure out
1168 * the missing CmdSN, although they should be
1169 * intelligent enough to determine the missing
1170 * CmdSN and issue a retry to plug the sequence.
1172 cmd->i_state = ISTATE_REMOVE;
1173 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1174 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1180 static u32 iscsit_do_crypto_hash_sg(
1181 struct hash_desc *hash,
1182 struct iscsi_cmd *cmd,
1190 struct scatterlist *sg;
1191 unsigned int page_off;
1193 crypto_hash_init(hash);
1195 sg = cmd->first_data_sg;
1196 page_off = cmd->first_data_sg_off;
1199 while (data_length) {
1200 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1202 crypto_hash_update(hash, &sg[i], cur_len);
1204 data_length -= cur_len;
1210 struct scatterlist pad_sg;
1212 sg_init_one(&pad_sg, pad_bytes, padding);
1213 crypto_hash_update(hash, &pad_sg, padding);
1215 crypto_hash_final(hash, (u8 *) &data_crc);
1220 static void iscsit_do_crypto_hash_buf(
1221 struct hash_desc *hash,
1228 struct scatterlist sg;
1230 crypto_hash_init(hash);
1232 sg_init_one(&sg, (u8 *)buf, payload_length);
1233 crypto_hash_update(hash, &sg, payload_length);
1236 sg_init_one(&sg, pad_bytes, padding);
1237 crypto_hash_update(hash, &sg, padding);
1239 crypto_hash_final(hash, data_crc);
1242 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1244 int iov_ret, ooo_cmdsn = 0, ret;
1245 u8 data_crc_failed = 0;
1246 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1247 u32 rx_size = 0, payload_length;
1248 struct iscsi_cmd *cmd = NULL;
1249 struct se_cmd *se_cmd;
1250 struct iscsi_data *hdr;
1252 unsigned long flags;
1254 hdr = (struct iscsi_data *) buf;
1255 payload_length = ntoh24(hdr->dlength);
1256 hdr->itt = be32_to_cpu(hdr->itt);
1257 hdr->ttt = be32_to_cpu(hdr->ttt);
1258 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1259 hdr->datasn = be32_to_cpu(hdr->datasn);
1260 hdr->offset = be32_to_cpu(hdr->offset);
1262 if (!payload_length) {
1263 pr_err("DataOUT payload is ZERO, protocol error.\n");
1264 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1269 spin_lock_bh(&conn->sess->session_stats_lock);
1270 conn->sess->rx_data_octets += payload_length;
1271 if (conn->sess->se_sess->se_node_acl) {
1272 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1273 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1274 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1276 spin_unlock_bh(&conn->sess->session_stats_lock);
1278 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1279 pr_err("DataSegmentLength: %u is greater than"
1280 " MaxRecvDataSegmentLength: %u\n", payload_length,
1281 conn->conn_ops->MaxRecvDataSegmentLength);
1282 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1286 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1291 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1292 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1293 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1294 payload_length, conn->cid);
1296 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1297 pr_err("Command ITT: 0x%08x received DataOUT after"
1298 " last DataOUT received, dumping payload\n",
1299 cmd->init_task_tag);
1300 return iscsit_dump_data_payload(conn, payload_length, 1);
1303 if (cmd->data_direction != DMA_TO_DEVICE) {
1304 pr_err("Command ITT: 0x%08x received DataOUT for a"
1305 " NON-WRITE command.\n", cmd->init_task_tag);
1306 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1309 se_cmd = &cmd->se_cmd;
1310 iscsit_mod_dataout_timer(cmd);
1312 if ((hdr->offset + payload_length) > cmd->data_length) {
1313 pr_err("DataOut Offset: %u, Length %u greater than"
1314 " iSCSI Command EDTL %u, protocol error.\n",
1315 hdr->offset, payload_length, cmd->data_length);
1316 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1320 if (cmd->unsolicited_data) {
1321 int dump_unsolicited_data = 0;
1323 if (conn->sess->sess_ops->InitialR2T) {
1324 pr_err("Received unexpected unsolicited data"
1325 " while InitialR2T=Yes, protocol error.\n");
1326 transport_send_check_condition_and_sense(&cmd->se_cmd,
1327 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1331 * Special case for dealing with Unsolicited DataOUT
1332 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1336 /* Something's amiss if we're not in WRITE_PENDING state... */
1337 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1338 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1339 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1341 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1342 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1343 (se_cmd->se_cmd_flags & SCF_SE_CMD_FAILED))
1344 dump_unsolicited_data = 1;
1345 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1347 if (dump_unsolicited_data) {
1349 * Check if a delayed TASK_ABORTED status needs to
1350 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1351 * received with the unsolicitied data out.
1353 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1354 iscsit_stop_dataout_timer(cmd);
1356 transport_check_aborted_status(se_cmd,
1357 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1358 return iscsit_dump_data_payload(conn, payload_length, 1);
1362 * For the normal solicited data path:
1364 * Check for a delayed TASK_ABORTED status and dump any
1365 * incoming data out payload if one exists. Also, when the
1366 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1367 * data out sequence, we decrement outstanding_r2ts. Once
1368 * outstanding_r2ts reaches zero, go ahead and send the delayed
1369 * TASK_ABORTED status.
1371 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1372 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1373 if (--cmd->outstanding_r2ts < 1) {
1374 iscsit_stop_dataout_timer(cmd);
1375 transport_check_aborted_status(
1379 return iscsit_dump_data_payload(conn, payload_length, 1);
1383 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1384 * within-command recovery checks before receiving the payload.
1386 ret = iscsit_check_pre_dataout(cmd, buf);
1387 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1389 else if (ret == DATAOUT_CANNOT_RECOVER)
1392 rx_size += payload_length;
1393 iov = &cmd->iov_data[0];
1395 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1399 iov_count += iov_ret;
1401 padding = ((-payload_length) & 3);
1403 iov[iov_count].iov_base = cmd->pad_bytes;
1404 iov[iov_count++].iov_len = padding;
1406 pr_debug("Receiving %u padding bytes.\n", padding);
1409 if (conn->conn_ops->DataDigest) {
1410 iov[iov_count].iov_base = &checksum;
1411 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1412 rx_size += ISCSI_CRC_LEN;
1415 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1417 iscsit_unmap_iovec(cmd);
1419 if (rx_got != rx_size)
1422 if (conn->conn_ops->DataDigest) {
1425 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1426 hdr->offset, payload_length, padding,
1429 if (checksum != data_crc) {
1430 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1431 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1432 " does not match computed 0x%08x\n",
1433 hdr->itt, hdr->offset, payload_length,
1434 hdr->datasn, checksum, data_crc);
1435 data_crc_failed = 1;
1437 pr_debug("Got CRC32C DataDigest 0x%08x for"
1438 " %u bytes of Data Out\n", checksum,
1443 * Increment post receive data and CRC values or perform
1444 * within-command recovery.
1446 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1447 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1449 else if (ret == DATAOUT_SEND_R2T) {
1450 iscsit_set_dataout_sequence_values(cmd);
1451 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1452 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1454 * Handle extra special case for out of order
1455 * Unsolicited Data Out.
1457 spin_lock_bh(&cmd->istate_lock);
1458 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1459 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1460 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1461 spin_unlock_bh(&cmd->istate_lock);
1463 iscsit_stop_dataout_timer(cmd);
1464 return (!ooo_cmdsn) ? transport_generic_handle_data(
1466 } else /* DATAOUT_CANNOT_RECOVER */
1472 static int iscsit_handle_nop_out(
1473 struct iscsi_conn *conn,
1476 unsigned char *ping_data = NULL;
1477 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1478 u32 checksum, data_crc, padding = 0, payload_length;
1480 struct iscsi_cmd *cmd = NULL;
1481 struct kvec *iov = NULL;
1482 struct iscsi_nopout *hdr;
1484 hdr = (struct iscsi_nopout *) buf;
1485 payload_length = ntoh24(hdr->dlength);
1486 lun = get_unaligned_le64(&hdr->lun);
1487 hdr->itt = be32_to_cpu(hdr->itt);
1488 hdr->ttt = be32_to_cpu(hdr->ttt);
1489 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1490 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1492 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1493 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1494 " not set, protocol error.\n");
1495 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1499 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1500 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1501 " greater than MaxRecvDataSegmentLength: %u, protocol"
1502 " error.\n", payload_length,
1503 conn->conn_ops->MaxRecvDataSegmentLength);
1504 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1508 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1509 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1510 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1511 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1514 * This is not a response to a Unsolicited NopIN, which means
1515 * it can either be a NOPOUT ping request (with a valid ITT),
1516 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1517 * Either way, make sure we allocate an struct iscsi_cmd, as both
1518 * can contain ping data.
1520 if (hdr->ttt == 0xFFFFFFFF) {
1521 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1523 return iscsit_add_reject(
1524 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1527 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1528 cmd->i_state = ISTATE_SEND_NOPIN;
1529 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1531 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1532 cmd->targ_xfer_tag = 0xFFFFFFFF;
1533 cmd->cmd_sn = hdr->cmdsn;
1534 cmd->exp_stat_sn = hdr->exp_statsn;
1535 cmd->data_direction = DMA_NONE;
1538 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1539 rx_size = payload_length;
1540 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1542 pr_err("Unable to allocate memory for"
1543 " NOPOUT ping data.\n");
1548 iov = &cmd->iov_misc[0];
1549 iov[niov].iov_base = ping_data;
1550 iov[niov++].iov_len = payload_length;
1552 padding = ((-payload_length) & 3);
1554 pr_debug("Receiving %u additional bytes"
1555 " for padding.\n", padding);
1556 iov[niov].iov_base = &cmd->pad_bytes;
1557 iov[niov++].iov_len = padding;
1560 if (conn->conn_ops->DataDigest) {
1561 iov[niov].iov_base = &checksum;
1562 iov[niov++].iov_len = ISCSI_CRC_LEN;
1563 rx_size += ISCSI_CRC_LEN;
1566 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1567 if (rx_got != rx_size) {
1572 if (conn->conn_ops->DataDigest) {
1573 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1574 ping_data, payload_length,
1575 padding, cmd->pad_bytes,
1578 if (checksum != data_crc) {
1579 pr_err("Ping data CRC32C DataDigest"
1580 " 0x%08x does not match computed 0x%08x\n",
1581 checksum, data_crc);
1582 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1583 pr_err("Unable to recover from"
1584 " NOPOUT Ping DataCRC failure while in"
1590 * Silently drop this PDU and let the
1591 * initiator plug the CmdSN gap.
1593 pr_debug("Dropping NOPOUT"
1594 " Command CmdSN: 0x%08x due to"
1595 " DataCRC error.\n", hdr->cmdsn);
1600 pr_debug("Got CRC32C DataDigest"
1601 " 0x%08x for %u bytes of ping data.\n",
1602 checksum, payload_length);
1606 ping_data[payload_length] = '\0';
1608 * Attach ping data to struct iscsi_cmd->buf_ptr.
1610 cmd->buf_ptr = (void *)ping_data;
1611 cmd->buf_ptr_size = payload_length;
1613 pr_debug("Got %u bytes of NOPOUT ping"
1614 " data.\n", payload_length);
1615 pr_debug("Ping Data: \"%s\"\n", ping_data);
1618 if (hdr->itt != 0xFFFFFFFF) {
1620 pr_err("Checking CmdSN for NOPOUT,"
1621 " but cmd is NULL!\n");
1625 * Initiator is expecting a NopIN ping reply,
1627 spin_lock_bh(&conn->cmd_lock);
1628 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1629 spin_unlock_bh(&conn->cmd_lock);
1631 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1633 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1634 iscsit_add_cmd_to_response_queue(cmd, conn,
1639 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1640 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1644 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1645 return iscsit_add_reject_from_cmd(
1646 ISCSI_REASON_PROTOCOL_ERROR,
1652 if (hdr->ttt != 0xFFFFFFFF) {
1654 * This was a response to a unsolicited NOPIN ping.
1656 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1660 iscsit_stop_nopin_response_timer(conn);
1662 cmd->i_state = ISTATE_REMOVE;
1663 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1664 iscsit_start_nopin_timer(conn);
1667 * Initiator is not expecting a NOPIN is response.
1668 * Just ignore for now.
1670 * iSCSI v19-91 10.18
1671 * "A NOP-OUT may also be used to confirm a changed
1672 * ExpStatSN if another PDU will not be available
1682 iscsit_release_cmd(cmd);
1688 static int iscsit_handle_task_mgt_cmd(
1689 struct iscsi_conn *conn,
1692 struct iscsi_cmd *cmd;
1693 struct se_tmr_req *se_tmr;
1694 struct iscsi_tmr_req *tmr_req;
1695 struct iscsi_tm *hdr;
1697 int out_of_order_cmdsn = 0;
1701 hdr = (struct iscsi_tm *) buf;
1702 payload_length = ntoh24(hdr->dlength);
1703 hdr->itt = be32_to_cpu(hdr->itt);
1704 hdr->rtt = be32_to_cpu(hdr->rtt);
1705 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1706 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1707 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1708 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1709 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1710 function = hdr->flags;
1712 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1713 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1714 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1715 hdr->rtt, hdr->refcmdsn, conn->cid);
1717 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1718 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1719 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1720 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1721 hdr->rtt = ISCSI_RESERVED_TAG;
1724 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1725 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1726 pr_err("Task Management Request TASK_REASSIGN not"
1727 " issued as immediate command, bad iSCSI Initiator"
1728 "implementation\n");
1729 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1732 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1733 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1734 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1736 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1738 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1741 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1742 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1743 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1744 cmd->init_task_tag = hdr->itt;
1745 cmd->targ_xfer_tag = 0xFFFFFFFF;
1746 cmd->cmd_sn = hdr->cmdsn;
1747 cmd->exp_stat_sn = hdr->exp_statsn;
1748 se_tmr = cmd->se_cmd.se_tmr_req;
1749 tmr_req = cmd->tmr_req;
1751 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1753 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1754 ret = iscsit_get_lun_for_tmr(cmd,
1755 get_unaligned_le64(&hdr->lun));
1757 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1758 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1764 case ISCSI_TM_FUNC_ABORT_TASK:
1765 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1766 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1767 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1771 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1772 case ISCSI_TM_FUNC_CLEAR_ACA:
1773 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1774 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1776 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1777 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1778 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1779 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1783 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1784 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1785 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1786 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1790 case ISCSI_TM_FUNC_TASK_REASSIGN:
1791 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1793 * Perform sanity checks on the ExpDataSN only if the
1794 * TASK_REASSIGN was successful.
1796 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1799 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1800 return iscsit_add_reject_from_cmd(
1801 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1805 pr_err("Unknown TMR function: 0x%02x, protocol"
1806 " error.\n", function);
1807 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1808 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1812 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1813 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1814 se_tmr->call_transport = 1;
1816 spin_lock_bh(&conn->cmd_lock);
1817 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1818 spin_unlock_bh(&conn->cmd_lock);
1820 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1821 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1822 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1823 out_of_order_cmdsn = 1;
1824 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1826 } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
1827 return iscsit_add_reject_from_cmd(
1828 ISCSI_REASON_PROTOCOL_ERROR,
1832 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1834 if (out_of_order_cmdsn)
1837 * Found the referenced task, send to transport for processing.
1839 if (se_tmr->call_transport)
1840 return transport_generic_handle_tmr(&cmd->se_cmd);
1843 * Could not find the referenced LUN, task, or Task Management
1844 * command not authorized or supported. Change state and
1845 * let the tx_thread send the response.
1847 * For connection recovery, this is also the default action for
1848 * TMR TASK_REASSIGN.
1850 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1854 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1855 static int iscsit_handle_text_cmd(
1856 struct iscsi_conn *conn,
1859 char *text_ptr, *text_in;
1860 int cmdsn_ret, niov = 0, rx_got, rx_size;
1861 u32 checksum = 0, data_crc = 0, payload_length;
1862 u32 padding = 0, pad_bytes = 0, text_length = 0;
1863 struct iscsi_cmd *cmd;
1865 struct iscsi_text *hdr;
1867 hdr = (struct iscsi_text *) buf;
1868 payload_length = ntoh24(hdr->dlength);
1869 hdr->itt = be32_to_cpu(hdr->itt);
1870 hdr->ttt = be32_to_cpu(hdr->ttt);
1871 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1872 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1874 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1875 pr_err("Unable to accept text parameter length: %u"
1876 "greater than MaxRecvDataSegmentLength %u.\n",
1877 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1878 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1882 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1883 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1884 hdr->exp_statsn, payload_length);
1886 rx_size = text_length = payload_length;
1888 text_in = kzalloc(text_length, GFP_KERNEL);
1890 pr_err("Unable to allocate memory for"
1891 " incoming text parameters\n");
1895 memset(iov, 0, 3 * sizeof(struct kvec));
1896 iov[niov].iov_base = text_in;
1897 iov[niov++].iov_len = text_length;
1899 padding = ((-payload_length) & 3);
1901 iov[niov].iov_base = &pad_bytes;
1902 iov[niov++].iov_len = padding;
1904 pr_debug("Receiving %u additional bytes"
1905 " for padding.\n", padding);
1907 if (conn->conn_ops->DataDigest) {
1908 iov[niov].iov_base = &checksum;
1909 iov[niov++].iov_len = ISCSI_CRC_LEN;
1910 rx_size += ISCSI_CRC_LEN;
1913 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1914 if (rx_got != rx_size) {
1919 if (conn->conn_ops->DataDigest) {
1920 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1921 text_in, text_length,
1922 padding, (u8 *)&pad_bytes,
1925 if (checksum != data_crc) {
1926 pr_err("Text data CRC32C DataDigest"
1927 " 0x%08x does not match computed"
1928 " 0x%08x\n", checksum, data_crc);
1929 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1930 pr_err("Unable to recover from"
1931 " Text Data digest failure while in"
1937 * Silently drop this PDU and let the
1938 * initiator plug the CmdSN gap.
1940 pr_debug("Dropping Text"
1941 " Command CmdSN: 0x%08x due to"
1942 " DataCRC error.\n", hdr->cmdsn);
1947 pr_debug("Got CRC32C DataDigest"
1948 " 0x%08x for %u bytes of text data.\n",
1949 checksum, text_length);
1952 text_in[text_length - 1] = '\0';
1953 pr_debug("Successfully read %d bytes of text"
1954 " data.\n", text_length);
1956 if (strncmp("SendTargets", text_in, 11) != 0) {
1957 pr_err("Received Text Data that is not"
1958 " SendTargets, cannot continue.\n");
1962 text_ptr = strchr(text_in, '=');
1964 pr_err("No \"=\" separator found in Text Data,"
1965 " cannot continue.\n");
1969 if (strncmp("=All", text_ptr, 4) != 0) {
1970 pr_err("Unable to locate All value for"
1971 " SendTargets key, cannot continue.\n");
1975 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1979 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1981 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1984 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1985 cmd->i_state = ISTATE_SEND_TEXTRSP;
1986 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1987 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1988 cmd->targ_xfer_tag = 0xFFFFFFFF;
1989 cmd->cmd_sn = hdr->cmdsn;
1990 cmd->exp_stat_sn = hdr->exp_statsn;
1991 cmd->data_direction = DMA_NONE;
1993 spin_lock_bh(&conn->cmd_lock);
1994 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1995 spin_unlock_bh(&conn->cmd_lock);
1997 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1999 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2000 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2001 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2002 return iscsit_add_reject_from_cmd(
2003 ISCSI_REASON_PROTOCOL_ERROR,
2009 return iscsit_execute_cmd(cmd, 0);
2012 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2014 struct iscsi_conn *conn_p;
2015 struct iscsi_session *sess = conn->sess;
2017 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2018 " for SID: %u.\n", conn->cid, conn->sess->sid);
2020 atomic_set(&sess->session_logout, 1);
2021 atomic_set(&conn->conn_logout_remove, 1);
2022 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2024 iscsit_inc_conn_usage_count(conn);
2025 iscsit_inc_session_usage_count(sess);
2027 spin_lock_bh(&sess->conn_lock);
2028 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2029 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2032 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2033 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2035 spin_unlock_bh(&sess->conn_lock);
2037 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2042 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2044 struct iscsi_conn *l_conn;
2045 struct iscsi_session *sess = conn->sess;
2047 pr_debug("Received logout request CLOSECONNECTION for CID:"
2048 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2051 * A Logout Request with a CLOSECONNECTION reason code for a CID
2052 * can arrive on a connection with a differing CID.
2054 if (conn->cid == cmd->logout_cid) {
2055 spin_lock_bh(&conn->state_lock);
2056 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2057 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2059 atomic_set(&conn->conn_logout_remove, 1);
2060 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2061 iscsit_inc_conn_usage_count(conn);
2063 spin_unlock_bh(&conn->state_lock);
2066 * Handle all different cid CLOSECONNECTION requests in
2067 * iscsit_logout_post_handler_diffcid() as to give enough
2068 * time for any non immediate command's CmdSN to be
2069 * acknowledged on the connection in question.
2071 * Here we simply make sure the CID is still around.
2073 l_conn = iscsit_get_conn_from_cid(sess,
2076 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2077 iscsit_add_cmd_to_response_queue(cmd, conn,
2082 iscsit_dec_conn_usage_count(l_conn);
2085 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2090 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2092 struct iscsi_session *sess = conn->sess;
2094 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2095 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2097 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2098 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2099 " while ERL!=2.\n");
2100 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2101 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2105 if (conn->cid == cmd->logout_cid) {
2106 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2107 " with CID: %hu on CID: %hu, implementation error.\n",
2108 cmd->logout_cid, conn->cid);
2109 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2110 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2114 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2119 static int iscsit_handle_logout_cmd(
2120 struct iscsi_conn *conn,
2123 int cmdsn_ret, logout_remove = 0;
2125 struct iscsi_cmd *cmd;
2126 struct iscsi_logout *hdr;
2127 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2129 hdr = (struct iscsi_logout *) buf;
2130 reason_code = (hdr->flags & 0x7f);
2131 hdr->itt = be32_to_cpu(hdr->itt);
2132 hdr->cid = be16_to_cpu(hdr->cid);
2133 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2134 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2137 spin_lock(&tiqn->logout_stats.lock);
2138 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2139 tiqn->logout_stats.normal_logouts++;
2141 tiqn->logout_stats.abnormal_logouts++;
2142 spin_unlock(&tiqn->logout_stats.lock);
2145 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2146 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2147 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2148 hdr->cid, conn->cid);
2150 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2151 pr_err("Received logout request on connection that"
2152 " is not in logged in state, ignoring request.\n");
2156 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2158 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2161 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2162 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2163 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2164 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2165 cmd->targ_xfer_tag = 0xFFFFFFFF;
2166 cmd->cmd_sn = hdr->cmdsn;
2167 cmd->exp_stat_sn = hdr->exp_statsn;
2168 cmd->logout_cid = hdr->cid;
2169 cmd->logout_reason = reason_code;
2170 cmd->data_direction = DMA_NONE;
2173 * We need to sleep in these cases (by returning 1) until the Logout
2174 * Response gets sent in the tx thread.
2176 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2177 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2178 (hdr->cid == conn->cid)))
2181 spin_lock_bh(&conn->cmd_lock);
2182 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2183 spin_unlock_bh(&conn->cmd_lock);
2185 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2186 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2189 * Immediate commands are executed, well, immediately.
2190 * Non-Immediate Logout Commands are executed in CmdSN order.
2192 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2193 int ret = iscsit_execute_cmd(cmd, 0);
2198 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2199 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2201 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2202 return iscsit_add_reject_from_cmd(
2203 ISCSI_REASON_PROTOCOL_ERROR,
2208 return logout_remove;
2211 static int iscsit_handle_snack(
2212 struct iscsi_conn *conn,
2217 struct iscsi_snack *hdr;
2219 hdr = (struct iscsi_snack *) buf;
2220 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2221 lun = get_unaligned_le64(&hdr->lun);
2222 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2223 hdr->itt = be32_to_cpu(hdr->itt);
2224 hdr->ttt = be32_to_cpu(hdr->ttt);
2225 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2226 hdr->begrun = be32_to_cpu(hdr->begrun);
2227 hdr->runlength = be32_to_cpu(hdr->runlength);
2229 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2230 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2231 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2232 hdr->begrun, hdr->runlength, conn->cid);
2234 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2235 pr_err("Initiator sent SNACK request while in"
2236 " ErrorRecoveryLevel=0.\n");
2237 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2241 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2242 * call from inside iscsi_send_recovery_datain_or_r2t().
2244 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2246 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2247 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2248 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2249 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2250 hdr->begrun, hdr->runlength);
2251 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2252 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2254 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2255 /* FIXME: Support R-Data SNACK */
2256 pr_err("R-Data SNACK Not Supported.\n");
2257 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2260 pr_err("Unknown SNACK type 0x%02x, protocol"
2261 " error.\n", hdr->flags & 0x0f);
2262 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2269 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2271 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2272 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2273 wait_for_completion_interruptible_timeout(
2274 &conn->rx_half_close_comp,
2275 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2279 static int iscsit_handle_immediate_data(
2280 struct iscsi_cmd *cmd,
2284 int iov_ret, rx_got = 0, rx_size = 0;
2285 u32 checksum, iov_count = 0, padding = 0;
2286 struct iscsi_conn *conn = cmd->conn;
2289 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2291 return IMMEDIATE_DATA_CANNOT_RECOVER;
2294 iov_count = iov_ret;
2295 iov = &cmd->iov_data[0];
2297 padding = ((-length) & 3);
2299 iov[iov_count].iov_base = cmd->pad_bytes;
2300 iov[iov_count++].iov_len = padding;
2304 if (conn->conn_ops->DataDigest) {
2305 iov[iov_count].iov_base = &checksum;
2306 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2307 rx_size += ISCSI_CRC_LEN;
2310 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2312 iscsit_unmap_iovec(cmd);
2314 if (rx_got != rx_size) {
2315 iscsit_rx_thread_wait_for_tcp(conn);
2316 return IMMEDIATE_DATA_CANNOT_RECOVER;
2319 if (conn->conn_ops->DataDigest) {
2322 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2323 cmd->write_data_done, length, padding,
2326 if (checksum != data_crc) {
2327 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2328 " does not match computed 0x%08x\n", checksum,
2331 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2332 pr_err("Unable to recover from"
2333 " Immediate Data digest failure while"
2335 iscsit_add_reject_from_cmd(
2336 ISCSI_REASON_DATA_DIGEST_ERROR,
2338 return IMMEDIATE_DATA_CANNOT_RECOVER;
2340 iscsit_add_reject_from_cmd(
2341 ISCSI_REASON_DATA_DIGEST_ERROR,
2343 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2346 pr_debug("Got CRC32C DataDigest 0x%08x for"
2347 " %u bytes of Immediate Data\n", checksum,
2352 cmd->write_data_done += length;
2354 if (cmd->write_data_done == cmd->data_length) {
2355 spin_lock_bh(&cmd->istate_lock);
2356 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2357 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2358 spin_unlock_bh(&cmd->istate_lock);
2361 return IMMEDIATE_DATA_NORMAL_OPERATION;
2365 * Called with sess->conn_lock held.
2367 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2368 with active network interface */
2369 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2371 struct iscsi_cmd *cmd;
2372 struct iscsi_conn *conn_p;
2375 * Only send a Asynchronous Message on connections whos network
2376 * interface is still functional.
2378 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2379 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2380 iscsit_inc_conn_usage_count(conn_p);
2388 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2390 iscsit_dec_conn_usage_count(conn_p);
2394 cmd->logout_cid = conn->cid;
2395 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2396 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2398 spin_lock_bh(&conn_p->cmd_lock);
2399 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2400 spin_unlock_bh(&conn_p->cmd_lock);
2402 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2403 iscsit_dec_conn_usage_count(conn_p);
2406 static int iscsit_send_conn_drop_async_message(
2407 struct iscsi_cmd *cmd,
2408 struct iscsi_conn *conn)
2410 struct iscsi_async *hdr;
2412 cmd->tx_size = ISCSI_HDR_LEN;
2413 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2415 hdr = (struct iscsi_async *) cmd->pdu;
2416 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2417 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2418 cmd->init_task_tag = 0xFFFFFFFF;
2419 cmd->targ_xfer_tag = 0xFFFFFFFF;
2420 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2421 cmd->stat_sn = conn->stat_sn++;
2422 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2423 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2424 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2425 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2426 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2427 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2428 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2430 if (conn->conn_ops->HeaderDigest) {
2431 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2433 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2434 (unsigned char *)hdr, ISCSI_HDR_LEN,
2435 0, NULL, (u8 *)header_digest);
2437 cmd->tx_size += ISCSI_CRC_LEN;
2438 pr_debug("Attaching CRC32C HeaderDigest to"
2439 " Async Message 0x%08x\n", *header_digest);
2442 cmd->iov_misc[0].iov_base = cmd->pdu;
2443 cmd->iov_misc[0].iov_len = cmd->tx_size;
2444 cmd->iov_misc_count = 1;
2446 pr_debug("Sending Connection Dropped Async Message StatSN:"
2447 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2448 cmd->logout_cid, conn->cid);
2452 static int iscsit_send_data_in(
2453 struct iscsi_cmd *cmd,
2454 struct iscsi_conn *conn,
2457 int iov_ret = 0, set_statsn = 0;
2458 u32 iov_count = 0, tx_size = 0;
2459 struct iscsi_datain datain;
2460 struct iscsi_datain_req *dr;
2461 struct iscsi_data_rsp *hdr;
2464 memset(&datain, 0, sizeof(struct iscsi_datain));
2465 dr = iscsit_get_datain_values(cmd, &datain);
2467 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2468 cmd->init_task_tag);
2473 * Be paranoid and double check the logic for now.
2475 if ((datain.offset + datain.length) > cmd->data_length) {
2476 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2477 " datain.length: %u exceeds cmd->data_length: %u\n",
2478 cmd->init_task_tag, datain.offset, datain.length,
2483 spin_lock_bh(&conn->sess->session_stats_lock);
2484 conn->sess->tx_data_octets += datain.length;
2485 if (conn->sess->se_sess->se_node_acl) {
2486 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2487 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2488 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2490 spin_unlock_bh(&conn->sess->session_stats_lock);
2492 * Special case for successfully execution w/ both DATAIN
2495 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2496 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2497 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2499 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2500 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2501 iscsit_increment_maxcmdsn(cmd, conn->sess);
2502 cmd->stat_sn = conn->stat_sn++;
2504 } else if (dr->dr_complete ==
2505 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2509 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2510 memset(hdr, 0, ISCSI_HDR_LEN);
2511 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2512 hdr->flags = datain.flags;
2513 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2514 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2515 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2516 hdr->residual_count = cpu_to_be32(cmd->residual_count);
2517 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2518 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2519 hdr->residual_count = cpu_to_be32(cmd->residual_count);
2522 hton24(hdr->dlength, datain.length);
2523 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2524 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2525 (struct scsi_lun *)&hdr->lun);
2527 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2529 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2530 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2531 cpu_to_be32(cmd->targ_xfer_tag) :
2533 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2535 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2536 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2537 hdr->datasn = cpu_to_be32(datain.data_sn);
2538 hdr->offset = cpu_to_be32(datain.offset);
2540 iov = &cmd->iov_data[0];
2541 iov[iov_count].iov_base = cmd->pdu;
2542 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2543 tx_size += ISCSI_HDR_LEN;
2545 if (conn->conn_ops->HeaderDigest) {
2546 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2548 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2549 (unsigned char *)hdr, ISCSI_HDR_LEN,
2550 0, NULL, (u8 *)header_digest);
2552 iov[0].iov_len += ISCSI_CRC_LEN;
2553 tx_size += ISCSI_CRC_LEN;
2555 pr_debug("Attaching CRC32 HeaderDigest"
2556 " for DataIN PDU 0x%08x\n", *header_digest);
2559 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2563 iov_count += iov_ret;
2564 tx_size += datain.length;
2566 cmd->padding = ((-datain.length) & 3);
2568 iov[iov_count].iov_base = cmd->pad_bytes;
2569 iov[iov_count++].iov_len = cmd->padding;
2570 tx_size += cmd->padding;
2572 pr_debug("Attaching %u padding bytes\n",
2575 if (conn->conn_ops->DataDigest) {
2576 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2577 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2579 iov[iov_count].iov_base = &cmd->data_crc;
2580 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2581 tx_size += ISCSI_CRC_LEN;
2583 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2584 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2587 cmd->iov_data_count = iov_count;
2588 cmd->tx_size = tx_size;
2590 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2591 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2592 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2593 ntohl(hdr->offset), datain.length, conn->cid);
2595 if (dr->dr_complete) {
2596 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2598 iscsit_free_datain_req(cmd, dr);
2604 static int iscsit_send_logout_response(
2605 struct iscsi_cmd *cmd,
2606 struct iscsi_conn *conn)
2608 int niov = 0, tx_size;
2609 struct iscsi_conn *logout_conn = NULL;
2610 struct iscsi_conn_recovery *cr = NULL;
2611 struct iscsi_session *sess = conn->sess;
2613 struct iscsi_logout_rsp *hdr;
2615 * The actual shutting down of Sessions and/or Connections
2616 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2617 * is done in scsi_logout_post_handler().
2619 switch (cmd->logout_reason) {
2620 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2621 pr_debug("iSCSI session logout successful, setting"
2622 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2623 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2626 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2629 * For CLOSECONNECTION logout requests carrying
2630 * a matching logout CID -> local CID, the reference
2631 * for the local CID will have been incremented in
2632 * iscsi_logout_closeconnection().
2634 * For CLOSECONNECTION logout requests carrying
2635 * a different CID than the connection it arrived
2636 * on, the connection responding to cmd->logout_cid
2637 * is stopped in iscsit_logout_post_handler_diffcid().
2640 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2641 " successful.\n", cmd->logout_cid, conn->cid);
2642 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2644 case ISCSI_LOGOUT_REASON_RECOVERY:
2645 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2646 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2649 * If the connection is still active from our point of view
2650 * force connection recovery to occur.
2652 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2654 if ((logout_conn)) {
2655 iscsit_connection_reinstatement_rcfr(logout_conn);
2656 iscsit_dec_conn_usage_count(logout_conn);
2659 cr = iscsit_get_inactive_connection_recovery_entry(
2660 conn->sess, cmd->logout_cid);
2662 pr_err("Unable to locate CID: %hu for"
2663 " REMOVECONNFORRECOVERY Logout Request.\n",
2665 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2669 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2671 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2672 " for recovery for CID: %hu on CID: %hu successful.\n",
2673 cmd->logout_cid, conn->cid);
2674 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2677 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2678 cmd->logout_reason);
2682 tx_size = ISCSI_HDR_LEN;
2683 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2684 memset(hdr, 0, ISCSI_HDR_LEN);
2685 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2686 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2687 hdr->response = cmd->logout_response;
2688 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2689 cmd->stat_sn = conn->stat_sn++;
2690 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2692 iscsit_increment_maxcmdsn(cmd, conn->sess);
2693 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2694 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2696 iov = &cmd->iov_misc[0];
2697 iov[niov].iov_base = cmd->pdu;
2698 iov[niov++].iov_len = ISCSI_HDR_LEN;
2700 if (conn->conn_ops->HeaderDigest) {
2701 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2703 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2704 (unsigned char *)hdr, ISCSI_HDR_LEN,
2705 0, NULL, (u8 *)header_digest);
2707 iov[0].iov_len += ISCSI_CRC_LEN;
2708 tx_size += ISCSI_CRC_LEN;
2709 pr_debug("Attaching CRC32C HeaderDigest to"
2710 " Logout Response 0x%08x\n", *header_digest);
2712 cmd->iov_misc_count = niov;
2713 cmd->tx_size = tx_size;
2715 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2716 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2717 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2718 cmd->logout_cid, conn->cid);
2724 * Unsolicited NOPIN, either requesting a response or not.
2726 static int iscsit_send_unsolicited_nopin(
2727 struct iscsi_cmd *cmd,
2728 struct iscsi_conn *conn,
2731 int tx_size = ISCSI_HDR_LEN;
2732 struct iscsi_nopin *hdr;
2734 hdr = (struct iscsi_nopin *) cmd->pdu;
2735 memset(hdr, 0, ISCSI_HDR_LEN);
2736 hdr->opcode = ISCSI_OP_NOOP_IN;
2737 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2738 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2739 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2740 cmd->stat_sn = conn->stat_sn;
2741 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2742 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2743 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2745 if (conn->conn_ops->HeaderDigest) {
2746 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2748 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2749 (unsigned char *)hdr, ISCSI_HDR_LEN,
2750 0, NULL, (u8 *)header_digest);
2752 tx_size += ISCSI_CRC_LEN;
2753 pr_debug("Attaching CRC32C HeaderDigest to"
2754 " NopIN 0x%08x\n", *header_digest);
2757 cmd->iov_misc[0].iov_base = cmd->pdu;
2758 cmd->iov_misc[0].iov_len = tx_size;
2759 cmd->iov_misc_count = 1;
2760 cmd->tx_size = tx_size;
2762 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2763 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2768 static int iscsit_send_nopin_response(
2769 struct iscsi_cmd *cmd,
2770 struct iscsi_conn *conn)
2772 int niov = 0, tx_size;
2775 struct iscsi_nopin *hdr;
2777 tx_size = ISCSI_HDR_LEN;
2778 hdr = (struct iscsi_nopin *) cmd->pdu;
2779 memset(hdr, 0, ISCSI_HDR_LEN);
2780 hdr->opcode = ISCSI_OP_NOOP_IN;
2781 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2782 hton24(hdr->dlength, cmd->buf_ptr_size);
2783 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2784 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2785 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2786 cmd->stat_sn = conn->stat_sn++;
2787 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2789 iscsit_increment_maxcmdsn(cmd, conn->sess);
2790 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2791 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2793 iov = &cmd->iov_misc[0];
2794 iov[niov].iov_base = cmd->pdu;
2795 iov[niov++].iov_len = ISCSI_HDR_LEN;
2797 if (conn->conn_ops->HeaderDigest) {
2798 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2800 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2801 (unsigned char *)hdr, ISCSI_HDR_LEN,
2802 0, NULL, (u8 *)header_digest);
2804 iov[0].iov_len += ISCSI_CRC_LEN;
2805 tx_size += ISCSI_CRC_LEN;
2806 pr_debug("Attaching CRC32C HeaderDigest"
2807 " to NopIn 0x%08x\n", *header_digest);
2811 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2812 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2814 if (cmd->buf_ptr_size) {
2815 iov[niov].iov_base = cmd->buf_ptr;
2816 iov[niov++].iov_len = cmd->buf_ptr_size;
2817 tx_size += cmd->buf_ptr_size;
2819 pr_debug("Echoing back %u bytes of ping"
2820 " data.\n", cmd->buf_ptr_size);
2822 padding = ((-cmd->buf_ptr_size) & 3);
2824 iov[niov].iov_base = &cmd->pad_bytes;
2825 iov[niov++].iov_len = padding;
2827 pr_debug("Attaching %u additional"
2828 " padding bytes.\n", padding);
2830 if (conn->conn_ops->DataDigest) {
2831 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2832 cmd->buf_ptr, cmd->buf_ptr_size,
2833 padding, (u8 *)&cmd->pad_bytes,
2834 (u8 *)&cmd->data_crc);
2836 iov[niov].iov_base = &cmd->data_crc;
2837 iov[niov++].iov_len = ISCSI_CRC_LEN;
2838 tx_size += ISCSI_CRC_LEN;
2839 pr_debug("Attached DataDigest for %u"
2840 " bytes of ping data, CRC 0x%08x\n",
2841 cmd->buf_ptr_size, cmd->data_crc);
2845 cmd->iov_misc_count = niov;
2846 cmd->tx_size = tx_size;
2848 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2849 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2850 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2855 int iscsit_send_r2t(
2856 struct iscsi_cmd *cmd,
2857 struct iscsi_conn *conn)
2860 struct iscsi_r2t *r2t;
2861 struct iscsi_r2t_rsp *hdr;
2863 r2t = iscsit_get_r2t_from_list(cmd);
2867 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2868 memset(hdr, 0, ISCSI_HDR_LEN);
2869 hdr->opcode = ISCSI_OP_R2T;
2870 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2871 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2872 (struct scsi_lun *)&hdr->lun);
2873 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2874 spin_lock_bh(&conn->sess->ttt_lock);
2875 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2876 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2877 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2878 spin_unlock_bh(&conn->sess->ttt_lock);
2879 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2880 hdr->statsn = cpu_to_be32(conn->stat_sn);
2881 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2882 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2883 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2884 hdr->data_offset = cpu_to_be32(r2t->offset);
2885 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2887 cmd->iov_misc[0].iov_base = cmd->pdu;
2888 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2889 tx_size += ISCSI_HDR_LEN;
2891 if (conn->conn_ops->HeaderDigest) {
2892 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2894 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2895 (unsigned char *)hdr, ISCSI_HDR_LEN,
2896 0, NULL, (u8 *)header_digest);
2898 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2899 tx_size += ISCSI_CRC_LEN;
2900 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2901 " PDU 0x%08x\n", *header_digest);
2904 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2905 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2906 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2907 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2908 r2t->offset, r2t->xfer_len, conn->cid);
2910 cmd->iov_misc_count = 1;
2911 cmd->tx_size = tx_size;
2913 spin_lock_bh(&cmd->r2t_lock);
2915 spin_unlock_bh(&cmd->r2t_lock);
2921 * type 0: Normal Operation.
2922 * type 1: Called from Storage Transport.
2923 * type 2: Called from iscsi_task_reassign_complete_write() for
2924 * connection recovery.
2926 int iscsit_build_r2ts_for_cmd(
2927 struct iscsi_cmd *cmd,
2928 struct iscsi_conn *conn,
2932 u32 offset = 0, xfer_len = 0;
2934 spin_lock_bh(&cmd->r2t_lock);
2935 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2936 spin_unlock_bh(&cmd->r2t_lock);
2940 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2941 if (cmd->r2t_offset < cmd->write_data_done)
2942 cmd->r2t_offset = cmd->write_data_done;
2944 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2945 if (conn->sess->sess_ops->DataSequenceInOrder) {
2946 offset = cmd->r2t_offset;
2948 if (first_r2t && (type == 2)) {
2949 xfer_len = ((offset +
2950 (conn->sess->sess_ops->MaxBurstLength -
2951 cmd->next_burst_len) >
2953 (cmd->data_length - offset) :
2954 (conn->sess->sess_ops->MaxBurstLength -
2955 cmd->next_burst_len));
2957 xfer_len = ((offset +
2958 conn->sess->sess_ops->MaxBurstLength) >
2960 (cmd->data_length - offset) :
2961 conn->sess->sess_ops->MaxBurstLength;
2963 cmd->r2t_offset += xfer_len;
2965 if (cmd->r2t_offset == cmd->data_length)
2966 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2968 struct iscsi_seq *seq;
2970 seq = iscsit_get_seq_holder_for_r2t(cmd);
2972 spin_unlock_bh(&cmd->r2t_lock);
2976 offset = seq->offset;
2977 xfer_len = seq->xfer_len;
2979 if (cmd->seq_send_order == cmd->seq_count)
2980 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2982 cmd->outstanding_r2ts++;
2985 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2986 spin_unlock_bh(&cmd->r2t_lock);
2990 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2993 spin_unlock_bh(&cmd->r2t_lock);
2998 static int iscsit_send_status(
2999 struct iscsi_cmd *cmd,
3000 struct iscsi_conn *conn)
3002 u8 iov_count = 0, recovery;
3003 u32 padding = 0, tx_size = 0;
3004 struct iscsi_scsi_rsp *hdr;
3007 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3009 cmd->stat_sn = conn->stat_sn++;
3011 spin_lock_bh(&conn->sess->session_stats_lock);
3012 conn->sess->rsp_pdus++;
3013 spin_unlock_bh(&conn->sess->session_stats_lock);
3015 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3016 memset(hdr, 0, ISCSI_HDR_LEN);
3017 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3018 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3019 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3020 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3021 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3022 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3023 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3024 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3026 hdr->response = cmd->iscsi_response;
3027 hdr->cmd_status = cmd->se_cmd.scsi_status;
3028 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3029 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3031 iscsit_increment_maxcmdsn(cmd, conn->sess);
3032 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3033 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3035 iov = &cmd->iov_misc[0];
3036 iov[iov_count].iov_base = cmd->pdu;
3037 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3038 tx_size += ISCSI_HDR_LEN;
3041 * Attach SENSE DATA payload to iSCSI Response PDU
3043 if (cmd->se_cmd.sense_buffer &&
3044 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3045 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3046 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3047 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3048 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3049 iov[iov_count++].iov_len =
3050 (cmd->se_cmd.scsi_sense_length + padding);
3051 tx_size += cmd->se_cmd.scsi_sense_length;
3054 memset(cmd->se_cmd.sense_buffer +
3055 cmd->se_cmd.scsi_sense_length, 0, padding);
3057 pr_debug("Adding %u bytes of padding to"
3058 " SENSE.\n", padding);
3061 if (conn->conn_ops->DataDigest) {
3062 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3063 cmd->se_cmd.sense_buffer,
3064 (cmd->se_cmd.scsi_sense_length + padding),
3065 0, NULL, (u8 *)&cmd->data_crc);
3067 iov[iov_count].iov_base = &cmd->data_crc;
3068 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3069 tx_size += ISCSI_CRC_LEN;
3071 pr_debug("Attaching CRC32 DataDigest for"
3072 " SENSE, %u bytes CRC 0x%08x\n",
3073 (cmd->se_cmd.scsi_sense_length + padding),
3077 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3079 cmd->se_cmd.scsi_sense_length);
3082 if (conn->conn_ops->HeaderDigest) {
3083 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3085 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3086 (unsigned char *)hdr, ISCSI_HDR_LEN,
3087 0, NULL, (u8 *)header_digest);
3089 iov[0].iov_len += ISCSI_CRC_LEN;
3090 tx_size += ISCSI_CRC_LEN;
3091 pr_debug("Attaching CRC32 HeaderDigest for Response"
3092 " PDU 0x%08x\n", *header_digest);
3095 cmd->iov_misc_count = iov_count;
3096 cmd->tx_size = tx_size;
3098 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3099 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3100 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3101 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3106 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3108 switch (se_tmr->response) {
3109 case TMR_FUNCTION_COMPLETE:
3110 return ISCSI_TMF_RSP_COMPLETE;
3111 case TMR_TASK_DOES_NOT_EXIST:
3112 return ISCSI_TMF_RSP_NO_TASK;
3113 case TMR_LUN_DOES_NOT_EXIST:
3114 return ISCSI_TMF_RSP_NO_LUN;
3115 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3116 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3117 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3118 return ISCSI_TMF_RSP_AUTH_FAILED;
3119 case TMR_FUNCTION_REJECTED:
3121 return ISCSI_TMF_RSP_REJECTED;
3125 static int iscsit_send_task_mgt_rsp(
3126 struct iscsi_cmd *cmd,
3127 struct iscsi_conn *conn)
3129 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3130 struct iscsi_tm_rsp *hdr;
3133 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3134 memset(hdr, 0, ISCSI_HDR_LEN);
3135 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3136 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3137 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3138 cmd->stat_sn = conn->stat_sn++;
3139 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3141 iscsit_increment_maxcmdsn(cmd, conn->sess);
3142 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3143 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3145 cmd->iov_misc[0].iov_base = cmd->pdu;
3146 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3147 tx_size += ISCSI_HDR_LEN;
3149 if (conn->conn_ops->HeaderDigest) {
3150 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3152 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3153 (unsigned char *)hdr, ISCSI_HDR_LEN,
3154 0, NULL, (u8 *)header_digest);
3156 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3157 tx_size += ISCSI_CRC_LEN;
3158 pr_debug("Attaching CRC32 HeaderDigest for Task"
3159 " Mgmt Response PDU 0x%08x\n", *header_digest);
3162 cmd->iov_misc_count = 1;
3163 cmd->tx_size = tx_size;
3165 pr_debug("Built Task Management Response ITT: 0x%08x,"
3166 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3167 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3172 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3174 char *payload = NULL;
3175 struct iscsi_conn *conn = cmd->conn;
3176 struct iscsi_portal_group *tpg;
3177 struct iscsi_tiqn *tiqn;
3178 struct iscsi_tpg_np *tpg_np;
3179 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3180 unsigned char buf[256];
3182 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3183 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3185 memset(buf, 0, 256);
3187 payload = kzalloc(buffer_len, GFP_KERNEL);
3189 pr_err("Unable to allocate memory for sendtargets"
3194 spin_lock(&tiqn_lock);
3195 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3196 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3199 if ((len + payload_len) > buffer_len) {
3200 spin_unlock(&tiqn->tiqn_tpg_lock);
3204 memcpy((void *)payload + payload_len, buf, len);
3207 spin_lock(&tiqn->tiqn_tpg_lock);
3208 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3210 spin_lock(&tpg->tpg_state_lock);
3211 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3212 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3213 spin_unlock(&tpg->tpg_state_lock);
3216 spin_unlock(&tpg->tpg_state_lock);
3218 spin_lock(&tpg->tpg_np_lock);
3219 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3221 len = sprintf(buf, "TargetAddress="
3223 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3224 "[" : "", tpg_np->tpg_np->np_ip,
3225 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3226 "]" : "", tpg_np->tpg_np->np_port,
3230 if ((len + payload_len) > buffer_len) {
3231 spin_unlock(&tpg->tpg_np_lock);
3232 spin_unlock(&tiqn->tiqn_tpg_lock);
3236 memcpy((void *)payload + payload_len, buf, len);
3239 spin_unlock(&tpg->tpg_np_lock);
3241 spin_unlock(&tiqn->tiqn_tpg_lock);
3246 spin_unlock(&tiqn_lock);
3248 cmd->buf_ptr = payload;
3254 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3255 * MaxRecvDataSegmentLength.
3257 static int iscsit_send_text_rsp(
3258 struct iscsi_cmd *cmd,
3259 struct iscsi_conn *conn)
3261 struct iscsi_text_rsp *hdr;
3263 u32 padding = 0, tx_size = 0;
3264 int text_length, iov_count = 0;
3266 text_length = iscsit_build_sendtargets_response(cmd);
3267 if (text_length < 0)
3270 padding = ((-text_length) & 3);
3272 memset(cmd->buf_ptr + text_length, 0, padding);
3273 pr_debug("Attaching %u additional bytes for"
3274 " padding.\n", padding);
3277 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3278 memset(hdr, 0, ISCSI_HDR_LEN);
3279 hdr->opcode = ISCSI_OP_TEXT_RSP;
3280 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3281 hton24(hdr->dlength, text_length);
3282 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3283 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3284 cmd->stat_sn = conn->stat_sn++;
3285 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3287 iscsit_increment_maxcmdsn(cmd, conn->sess);
3288 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3289 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3291 iov = &cmd->iov_misc[0];
3293 iov[iov_count].iov_base = cmd->pdu;
3294 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3295 iov[iov_count].iov_base = cmd->buf_ptr;
3296 iov[iov_count++].iov_len = text_length + padding;
3298 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3300 if (conn->conn_ops->HeaderDigest) {
3301 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3303 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3304 (unsigned char *)hdr, ISCSI_HDR_LEN,
3305 0, NULL, (u8 *)header_digest);
3307 iov[0].iov_len += ISCSI_CRC_LEN;
3308 tx_size += ISCSI_CRC_LEN;
3309 pr_debug("Attaching CRC32 HeaderDigest for"
3310 " Text Response PDU 0x%08x\n", *header_digest);
3313 if (conn->conn_ops->DataDigest) {
3314 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3315 cmd->buf_ptr, (text_length + padding),
3316 0, NULL, (u8 *)&cmd->data_crc);
3318 iov[iov_count].iov_base = &cmd->data_crc;
3319 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3320 tx_size += ISCSI_CRC_LEN;
3322 pr_debug("Attaching DataDigest for %u bytes of text"
3323 " data, CRC 0x%08x\n", (text_length + padding),
3327 cmd->iov_misc_count = iov_count;
3328 cmd->tx_size = tx_size;
3330 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3331 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3332 text_length, conn->cid);
3336 static int iscsit_send_reject(
3337 struct iscsi_cmd *cmd,
3338 struct iscsi_conn *conn)
3340 u32 iov_count = 0, tx_size = 0;
3341 struct iscsi_reject *hdr;
3344 hdr = (struct iscsi_reject *) cmd->pdu;
3345 hdr->opcode = ISCSI_OP_REJECT;
3346 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3347 hton24(hdr->dlength, ISCSI_HDR_LEN);
3348 cmd->stat_sn = conn->stat_sn++;
3349 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3350 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3351 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3353 iov = &cmd->iov_misc[0];
3355 iov[iov_count].iov_base = cmd->pdu;
3356 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3357 iov[iov_count].iov_base = cmd->buf_ptr;
3358 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3360 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3362 if (conn->conn_ops->HeaderDigest) {
3363 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3365 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3366 (unsigned char *)hdr, ISCSI_HDR_LEN,
3367 0, NULL, (u8 *)header_digest);
3369 iov[0].iov_len += ISCSI_CRC_LEN;
3370 tx_size += ISCSI_CRC_LEN;
3371 pr_debug("Attaching CRC32 HeaderDigest for"
3372 " REJECT PDU 0x%08x\n", *header_digest);
3375 if (conn->conn_ops->DataDigest) {
3376 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3377 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3378 0, NULL, (u8 *)&cmd->data_crc);
3380 iov[iov_count].iov_base = &cmd->data_crc;
3381 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3382 tx_size += ISCSI_CRC_LEN;
3383 pr_debug("Attaching CRC32 DataDigest for REJECT"
3384 " PDU 0x%08x\n", cmd->data_crc);
3387 cmd->iov_misc_count = iov_count;
3388 cmd->tx_size = tx_size;
3390 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3391 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3396 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3398 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3399 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3400 wait_for_completion_interruptible_timeout(
3401 &conn->tx_half_close_comp,
3402 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3408 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3410 struct iscsi_thread_set *ts = conn->thread_set;
3413 * thread_id is assigned from iscsit_global->ts_bitmap from
3414 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3416 * Here we use thread_id to determine which CPU that this
3417 * iSCSI connection's iscsi_thread_set will be scheduled to
3420 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3422 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3423 " thread_id: %d\n", ord, ts->thread_id);
3425 for_each_online_cpu(cpu) {
3427 cpumask_set_cpu(cpu, conn->conn_cpumask);
3432 * This should never be reached..
3435 cpumask_setall(conn->conn_cpumask);
3438 static inline void iscsit_thread_check_cpumask(
3439 struct iscsi_conn *conn,
3440 struct task_struct *p,
3445 * mode == 1 signals iscsi_target_tx_thread() usage.
3446 * mode == 0 signals iscsi_target_rx_thread() usage.
3449 if (!conn->conn_tx_reset_cpumask)
3451 conn->conn_tx_reset_cpumask = 0;
3453 if (!conn->conn_rx_reset_cpumask)
3455 conn->conn_rx_reset_cpumask = 0;
3458 * Update the CPU mask for this single kthread so that
3459 * both TX and RX kthreads are scheduled to run on the
3462 memset(buf, 0, 128);
3463 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3465 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3466 " %s for %s\n", buf, p->comm);
3468 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3473 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3478 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3479 #endif /* CONFIG_SMP */
3481 int iscsi_target_tx_thread(void *arg)
3486 int sent_status = 0;
3489 struct iscsi_cmd *cmd = NULL;
3490 struct iscsi_conn *conn;
3491 struct iscsi_queue_req *qr = NULL;
3492 struct se_cmd *se_cmd;
3493 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3495 * Allow ourselves to be interrupted by SIGINT so that a
3496 * connection recovery / failure event can be triggered externally.
3498 allow_signal(SIGINT);
3501 conn = iscsi_tx_thread_pre_handler(ts);
3505 eodr = map_sg = ret = sent_status = use_misc = 0;
3507 while (!kthread_should_stop()) {
3509 * Ensure that both TX and RX per connection kthreads
3510 * are scheduled to run on the same CPU.
3512 iscsit_thread_check_cpumask(conn, current, 1);
3514 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3516 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3517 signal_pending(current))
3521 qr = iscsit_get_cmd_from_immediate_queue(conn);
3523 atomic_set(&conn->check_immediate_queue, 0);
3526 kmem_cache_free(lio_qr_cache, qr);
3528 spin_lock_bh(&cmd->istate_lock);
3530 case ISTATE_SEND_R2T:
3531 spin_unlock_bh(&cmd->istate_lock);
3532 ret = iscsit_send_r2t(cmd, conn);
3535 spin_unlock_bh(&cmd->istate_lock);
3537 if (cmd->data_direction == DMA_TO_DEVICE)
3538 iscsit_stop_dataout_timer(cmd);
3540 spin_lock_bh(&conn->cmd_lock);
3541 list_del(&cmd->i_list);
3542 spin_unlock_bh(&conn->cmd_lock);
3544 iscsit_free_cmd(cmd);
3546 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3547 spin_unlock_bh(&cmd->istate_lock);
3548 iscsit_mod_nopin_response_timer(conn);
3549 ret = iscsit_send_unsolicited_nopin(cmd,
3552 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3553 spin_unlock_bh(&cmd->istate_lock);
3554 ret = iscsit_send_unsolicited_nopin(cmd,
3558 pr_err("Unknown Opcode: 0x%02x ITT:"
3559 " 0x%08x, i_state: %d on CID: %hu\n",
3560 cmd->iscsi_opcode, cmd->init_task_tag, state,
3562 spin_unlock_bh(&cmd->istate_lock);
3566 conn->tx_immediate_queue = 0;
3570 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3571 conn->tx_immediate_queue = 0;
3572 iscsit_tx_thread_wait_for_tcp(conn);
3576 spin_lock_bh(&cmd->istate_lock);
3578 case ISTATE_SEND_R2T:
3579 spin_unlock_bh(&cmd->istate_lock);
3580 spin_lock_bh(&cmd->dataout_timeout_lock);
3581 iscsit_start_dataout_timer(cmd, conn);
3582 spin_unlock_bh(&cmd->dataout_timeout_lock);
3584 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3585 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3586 spin_unlock_bh(&cmd->istate_lock);
3588 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3589 cmd->i_state = ISTATE_SENT_STATUS;
3590 spin_unlock_bh(&cmd->istate_lock);
3593 pr_err("Unknown Opcode: 0x%02x ITT:"
3594 " 0x%08x, i_state: %d on CID: %hu\n",
3595 cmd->iscsi_opcode, cmd->init_task_tag,
3597 spin_unlock_bh(&cmd->istate_lock);
3602 conn->tx_immediate_queue = 0;
3605 qr = iscsit_get_cmd_from_response_queue(conn);
3609 kmem_cache_free(lio_qr_cache, qr);
3611 spin_lock_bh(&cmd->istate_lock);
3614 case ISTATE_SEND_DATAIN:
3615 spin_unlock_bh(&cmd->istate_lock);
3616 ret = iscsit_send_data_in(cmd, conn,
3620 case ISTATE_SEND_STATUS:
3621 case ISTATE_SEND_STATUS_RECOVERY:
3622 spin_unlock_bh(&cmd->istate_lock);
3624 ret = iscsit_send_status(cmd, conn);
3626 case ISTATE_SEND_LOGOUTRSP:
3627 spin_unlock_bh(&cmd->istate_lock);
3629 ret = iscsit_send_logout_response(cmd, conn);
3631 case ISTATE_SEND_ASYNCMSG:
3632 spin_unlock_bh(&cmd->istate_lock);
3634 ret = iscsit_send_conn_drop_async_message(
3637 case ISTATE_SEND_NOPIN:
3638 spin_unlock_bh(&cmd->istate_lock);
3640 ret = iscsit_send_nopin_response(cmd, conn);
3642 case ISTATE_SEND_REJECT:
3643 spin_unlock_bh(&cmd->istate_lock);
3645 ret = iscsit_send_reject(cmd, conn);
3647 case ISTATE_SEND_TASKMGTRSP:
3648 spin_unlock_bh(&cmd->istate_lock);
3650 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3653 ret = iscsit_tmr_post_handler(cmd, conn);
3655 iscsit_fall_back_to_erl0(conn->sess);
3657 case ISTATE_SEND_TEXTRSP:
3658 spin_unlock_bh(&cmd->istate_lock);
3660 ret = iscsit_send_text_rsp(cmd, conn);
3663 pr_err("Unknown Opcode: 0x%02x ITT:"
3664 " 0x%08x, i_state: %d on CID: %hu\n",
3665 cmd->iscsi_opcode, cmd->init_task_tag,
3667 spin_unlock_bh(&cmd->istate_lock);
3671 conn->tx_response_queue = 0;
3675 se_cmd = &cmd->se_cmd;
3677 if (map_sg && !conn->conn_ops->IFMarker) {
3678 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3679 conn->tx_response_queue = 0;
3680 iscsit_tx_thread_wait_for_tcp(conn);
3681 iscsit_unmap_iovec(cmd);
3685 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3686 conn->tx_response_queue = 0;
3687 iscsit_tx_thread_wait_for_tcp(conn);
3688 iscsit_unmap_iovec(cmd);
3693 iscsit_unmap_iovec(cmd);
3695 spin_lock_bh(&cmd->istate_lock);
3697 case ISTATE_SEND_DATAIN:
3699 goto check_rsp_state;
3702 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3704 eodr = use_misc = 0;
3705 } else if (eodr == 2) {
3706 cmd->i_state = state =
3709 eodr = use_misc = 0;
3710 goto check_rsp_state;
3713 case ISTATE_SEND_STATUS:
3717 case ISTATE_SEND_ASYNCMSG:
3718 case ISTATE_SEND_NOPIN:
3719 case ISTATE_SEND_STATUS_RECOVERY:
3720 case ISTATE_SEND_TEXTRSP:
3724 case ISTATE_SEND_REJECT:
3726 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3727 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3728 spin_unlock_bh(&cmd->istate_lock);
3729 complete(&cmd->reject_comp);
3732 complete(&cmd->reject_comp);
3734 case ISTATE_SEND_TASKMGTRSP:
3738 case ISTATE_SEND_LOGOUTRSP:
3739 spin_unlock_bh(&cmd->istate_lock);
3740 if (!iscsit_logout_post_handler(cmd, conn))
3742 spin_lock_bh(&cmd->istate_lock);
3747 pr_err("Unknown Opcode: 0x%02x ITT:"
3748 " 0x%08x, i_state: %d on CID: %hu\n",
3749 cmd->iscsi_opcode, cmd->init_task_tag,
3750 cmd->i_state, conn->cid);
3751 spin_unlock_bh(&cmd->istate_lock);
3756 cmd->i_state = ISTATE_SENT_STATUS;
3759 spin_unlock_bh(&cmd->istate_lock);
3761 if (atomic_read(&conn->check_immediate_queue))
3766 conn->tx_response_queue = 0;
3770 iscsit_take_action_for_connection_exit(conn);
3776 int iscsi_target_rx_thread(void *arg)
3779 u8 buffer[ISCSI_HDR_LEN], opcode;
3780 u32 checksum = 0, digest = 0;
3781 struct iscsi_conn *conn = NULL;
3782 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3785 * Allow ourselves to be interrupted by SIGINT so that a
3786 * connection recovery / failure event can be triggered externally.
3788 allow_signal(SIGINT);
3791 conn = iscsi_rx_thread_pre_handler(ts);
3795 while (!kthread_should_stop()) {
3797 * Ensure that both TX and RX per connection kthreads
3798 * are scheduled to run on the same CPU.
3800 iscsit_thread_check_cpumask(conn, current, 0);
3802 memset(buffer, 0, ISCSI_HDR_LEN);
3803 memset(&iov, 0, sizeof(struct kvec));
3805 iov.iov_base = buffer;
3806 iov.iov_len = ISCSI_HDR_LEN;
3808 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3809 if (ret != ISCSI_HDR_LEN) {
3810 iscsit_rx_thread_wait_for_tcp(conn);
3815 * Set conn->bad_hdr for use with REJECT PDUs.
3817 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3819 if (conn->conn_ops->HeaderDigest) {
3820 iov.iov_base = &digest;
3821 iov.iov_len = ISCSI_CRC_LEN;
3823 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3824 if (ret != ISCSI_CRC_LEN) {
3825 iscsit_rx_thread_wait_for_tcp(conn);
3829 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3830 buffer, ISCSI_HDR_LEN,
3831 0, NULL, (u8 *)&checksum);
3833 if (digest != checksum) {
3834 pr_err("HeaderDigest CRC32C failed,"
3835 " received 0x%08x, computed 0x%08x\n",
3838 * Set the PDU to 0xff so it will intentionally
3839 * hit default in the switch below.
3841 memset(buffer, 0xff, ISCSI_HDR_LEN);
3842 spin_lock_bh(&conn->sess->session_stats_lock);
3843 conn->sess->conn_digest_errors++;
3844 spin_unlock_bh(&conn->sess->session_stats_lock);
3846 pr_debug("Got HeaderDigest CRC32C"
3847 " 0x%08x\n", checksum);
3851 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3854 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3856 if (conn->sess->sess_ops->SessionType &&
3857 ((!(opcode & ISCSI_OP_TEXT)) ||
3858 (!(opcode & ISCSI_OP_LOGOUT)))) {
3859 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3860 " while in Discovery Session, rejecting.\n", opcode);
3861 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3867 case ISCSI_OP_SCSI_CMD:
3868 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3871 case ISCSI_OP_SCSI_DATA_OUT:
3872 if (iscsit_handle_data_out(conn, buffer) < 0)
3875 case ISCSI_OP_NOOP_OUT:
3876 if (iscsit_handle_nop_out(conn, buffer) < 0)
3879 case ISCSI_OP_SCSI_TMFUNC:
3880 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3884 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3887 case ISCSI_OP_LOGOUT:
3888 ret = iscsit_handle_logout_cmd(conn, buffer);
3890 wait_for_completion_timeout(&conn->conn_logout_comp,
3891 SECONDS_FOR_LOGOUT_COMP * HZ);
3896 case ISCSI_OP_SNACK:
3897 if (iscsit_handle_snack(conn, buffer) < 0)
3901 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3903 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3904 pr_err("Cannot recover from unknown"
3905 " opcode while ERL=0, closing iSCSI connection"
3909 if (!conn->conn_ops->OFMarker) {
3910 pr_err("Unable to recover from unknown"
3911 " opcode while OFMarker=No, closing iSCSI"
3915 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3916 pr_err("Unable to recover from unknown"
3917 " opcode, closing iSCSI connection.\n");
3925 if (!signal_pending(current))
3926 atomic_set(&conn->transport_failed, 1);
3927 iscsit_take_action_for_connection_exit(conn);
3933 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3935 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3936 struct iscsi_session *sess = conn->sess;
3938 * We expect this function to only ever be called from either RX or TX
3939 * thread context via iscsit_close_connection() once the other context
3940 * has been reset -> returned sleeping pre-handler state.
3942 spin_lock_bh(&conn->cmd_lock);
3943 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3945 list_del(&cmd->i_list);
3946 spin_unlock_bh(&conn->cmd_lock);
3948 iscsit_increment_maxcmdsn(cmd, sess);
3950 iscsit_free_cmd(cmd);
3952 spin_lock_bh(&conn->cmd_lock);
3954 spin_unlock_bh(&conn->cmd_lock);
3957 static void iscsit_stop_timers_for_cmds(
3958 struct iscsi_conn *conn)
3960 struct iscsi_cmd *cmd;
3962 spin_lock_bh(&conn->cmd_lock);
3963 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3964 if (cmd->data_direction == DMA_TO_DEVICE)
3965 iscsit_stop_dataout_timer(cmd);
3967 spin_unlock_bh(&conn->cmd_lock);
3970 int iscsit_close_connection(
3971 struct iscsi_conn *conn)
3973 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3974 struct iscsi_session *sess = conn->sess;
3976 pr_debug("Closing iSCSI connection CID %hu on SID:"
3977 " %u\n", conn->cid, sess->sid);
3979 * Always up conn_logout_comp just in case the RX Thread is sleeping
3980 * and the logout response never got sent because the connection
3983 complete(&conn->conn_logout_comp);
3985 iscsi_release_thread_set(conn);
3987 iscsit_stop_timers_for_cmds(conn);
3988 iscsit_stop_nopin_response_timer(conn);
3989 iscsit_stop_nopin_timer(conn);
3990 iscsit_free_queue_reqs_for_conn(conn);
3993 * During Connection recovery drop unacknowledged out of order
3994 * commands for this connection, and prepare the other commands
3997 * During normal operation clear the out of order commands (but
3998 * do not free the struct iscsi_ooo_cmdsn's) and release all
3999 * struct iscsi_cmds.
4001 if (atomic_read(&conn->connection_recovery)) {
4002 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4003 iscsit_prepare_cmds_for_realligance(conn);
4005 iscsit_clear_ooo_cmdsns_for_conn(conn);
4006 iscsit_release_commands_from_conn(conn);
4010 * Handle decrementing session or connection usage count if
4011 * a logout response was not able to be sent because the
4012 * connection failed. Fall back to Session Recovery here.
4014 if (atomic_read(&conn->conn_logout_remove)) {
4015 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4016 iscsit_dec_conn_usage_count(conn);
4017 iscsit_dec_session_usage_count(sess);
4019 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4020 iscsit_dec_conn_usage_count(conn);
4022 atomic_set(&conn->conn_logout_remove, 0);
4023 atomic_set(&sess->session_reinstatement, 0);
4024 atomic_set(&sess->session_fall_back_to_erl0, 1);
4027 spin_lock_bh(&sess->conn_lock);
4028 list_del(&conn->conn_list);
4031 * Attempt to let the Initiator know this connection failed by
4032 * sending an Connection Dropped Async Message on another
4033 * active connection.
4035 if (atomic_read(&conn->connection_recovery))
4036 iscsit_build_conn_drop_async_message(conn);
4038 spin_unlock_bh(&sess->conn_lock);
4041 * If connection reinstatement is being performed on this connection,
4042 * up the connection reinstatement semaphore that is being blocked on
4043 * in iscsit_cause_connection_reinstatement().
4045 spin_lock_bh(&conn->state_lock);
4046 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4047 spin_unlock_bh(&conn->state_lock);
4048 complete(&conn->conn_wait_comp);
4049 wait_for_completion(&conn->conn_post_wait_comp);
4050 spin_lock_bh(&conn->state_lock);
4054 * If connection reinstatement is being performed on this connection
4055 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4056 * connection wait rcfr semaphore that is being blocked on
4057 * an iscsit_connection_reinstatement_rcfr().
4059 if (atomic_read(&conn->connection_wait_rcfr)) {
4060 spin_unlock_bh(&conn->state_lock);
4061 complete(&conn->conn_wait_rcfr_comp);
4062 wait_for_completion(&conn->conn_post_wait_comp);
4063 spin_lock_bh(&conn->state_lock);
4065 atomic_set(&conn->connection_reinstatement, 1);
4066 spin_unlock_bh(&conn->state_lock);
4069 * If any other processes are accessing this connection pointer we
4070 * must wait until they have completed.
4072 iscsit_check_conn_usage_count(conn);
4074 if (conn->conn_rx_hash.tfm)
4075 crypto_free_hash(conn->conn_rx_hash.tfm);
4076 if (conn->conn_tx_hash.tfm)
4077 crypto_free_hash(conn->conn_tx_hash.tfm);
4079 if (conn->conn_cpumask)
4080 free_cpumask_var(conn->conn_cpumask);
4082 kfree(conn->conn_ops);
4083 conn->conn_ops = NULL;
4086 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4087 kfree(conn->sock->file);
4088 conn->sock->file = NULL;
4090 sock_release(conn->sock);
4092 conn->thread_set = NULL;
4094 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4095 conn->conn_state = TARG_CONN_STATE_FREE;
4098 spin_lock_bh(&sess->conn_lock);
4099 atomic_dec(&sess->nconn);
4100 pr_debug("Decremented iSCSI connection count to %hu from node:"
4101 " %s\n", atomic_read(&sess->nconn),
4102 sess->sess_ops->InitiatorName);
4104 * Make sure that if one connection fails in an non ERL=2 iSCSI
4105 * Session that they all fail.
4107 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4108 !atomic_read(&sess->session_logout))
4109 atomic_set(&sess->session_fall_back_to_erl0, 1);
4112 * If this was not the last connection in the session, and we are
4113 * performing session reinstatement or falling back to ERL=0, call
4114 * iscsit_stop_session() without sleeping to shutdown the other
4115 * active connections.
4117 if (atomic_read(&sess->nconn)) {
4118 if (!atomic_read(&sess->session_reinstatement) &&
4119 !atomic_read(&sess->session_fall_back_to_erl0)) {
4120 spin_unlock_bh(&sess->conn_lock);
4123 if (!atomic_read(&sess->session_stop_active)) {
4124 atomic_set(&sess->session_stop_active, 1);
4125 spin_unlock_bh(&sess->conn_lock);
4126 iscsit_stop_session(sess, 0, 0);
4129 spin_unlock_bh(&sess->conn_lock);
4134 * If this was the last connection in the session and one of the
4135 * following is occurring:
4137 * Session Reinstatement is not being performed, and are falling back
4138 * to ERL=0 call iscsit_close_session().
4140 * Session Logout was requested. iscsit_close_session() will be called
4143 * Session Continuation is not being performed, start the Time2Retain
4144 * handler and check if sleep_on_sess_wait_sem is active.
4146 if (!atomic_read(&sess->session_reinstatement) &&
4147 atomic_read(&sess->session_fall_back_to_erl0)) {
4148 spin_unlock_bh(&sess->conn_lock);
4149 iscsit_close_session(sess);
4152 } else if (atomic_read(&sess->session_logout)) {
4153 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4154 sess->session_state = TARG_SESS_STATE_FREE;
4155 spin_unlock_bh(&sess->conn_lock);
4157 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4158 complete(&sess->session_wait_comp);
4162 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4163 sess->session_state = TARG_SESS_STATE_FAILED;
4165 if (!atomic_read(&sess->session_continuation)) {
4166 spin_unlock_bh(&sess->conn_lock);
4167 iscsit_start_time2retain_handler(sess);
4169 spin_unlock_bh(&sess->conn_lock);
4171 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4172 complete(&sess->session_wait_comp);
4176 spin_unlock_bh(&sess->conn_lock);
4181 int iscsit_close_session(struct iscsi_session *sess)
4183 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4184 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4186 if (atomic_read(&sess->nconn)) {
4187 pr_err("%d connection(s) still exist for iSCSI session"
4188 " to %s\n", atomic_read(&sess->nconn),
4189 sess->sess_ops->InitiatorName);
4193 spin_lock_bh(&se_tpg->session_lock);
4194 atomic_set(&sess->session_logout, 1);
4195 atomic_set(&sess->session_reinstatement, 1);
4196 iscsit_stop_time2retain_timer(sess);
4197 spin_unlock_bh(&se_tpg->session_lock);
4200 * transport_deregister_session_configfs() will clear the
4201 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4202 * can be setting it again with __transport_register_session() in
4203 * iscsi_post_login_handler() again after the iscsit_stop_session()
4204 * completes in iscsi_np context.
4206 transport_deregister_session_configfs(sess->se_sess);
4209 * If any other processes are accessing this session pointer we must
4210 * wait until they have completed. If we are in an interrupt (the
4211 * time2retain handler) and contain and active session usage count we
4212 * restart the timer and exit.
4214 if (!in_interrupt()) {
4215 if (iscsit_check_session_usage_count(sess) == 1)
4216 iscsit_stop_session(sess, 1, 1);
4218 if (iscsit_check_session_usage_count(sess) == 2) {
4219 atomic_set(&sess->session_logout, 0);
4220 iscsit_start_time2retain_handler(sess);
4225 transport_deregister_session(sess->se_sess);
4227 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4228 iscsit_free_connection_recovery_entires(sess);
4230 iscsit_free_all_ooo_cmdsns(sess);
4232 spin_lock_bh(&se_tpg->session_lock);
4233 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4234 sess->session_state = TARG_SESS_STATE_FREE;
4235 pr_debug("Released iSCSI session from node: %s\n",
4236 sess->sess_ops->InitiatorName);
4239 tpg->tpg_tiqn->tiqn_nsessions--;
4241 pr_debug("Decremented number of active iSCSI Sessions on"
4242 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4244 spin_lock(&sess_idr_lock);
4245 idr_remove(&sess_idr, sess->session_index);
4246 spin_unlock(&sess_idr_lock);
4248 kfree(sess->sess_ops);
4249 sess->sess_ops = NULL;
4250 spin_unlock_bh(&se_tpg->session_lock);
4256 static void iscsit_logout_post_handler_closesession(
4257 struct iscsi_conn *conn)
4259 struct iscsi_session *sess = conn->sess;
4261 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4262 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4264 atomic_set(&conn->conn_logout_remove, 0);
4265 complete(&conn->conn_logout_comp);
4267 iscsit_dec_conn_usage_count(conn);
4268 iscsit_stop_session(sess, 1, 1);
4269 iscsit_dec_session_usage_count(sess);
4270 iscsit_close_session(sess);
4273 static void iscsit_logout_post_handler_samecid(
4274 struct iscsi_conn *conn)
4276 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4277 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4279 atomic_set(&conn->conn_logout_remove, 0);
4280 complete(&conn->conn_logout_comp);
4282 iscsit_cause_connection_reinstatement(conn, 1);
4283 iscsit_dec_conn_usage_count(conn);
4286 static void iscsit_logout_post_handler_diffcid(
4287 struct iscsi_conn *conn,
4290 struct iscsi_conn *l_conn;
4291 struct iscsi_session *sess = conn->sess;
4296 spin_lock_bh(&sess->conn_lock);
4297 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4298 if (l_conn->cid == cid) {
4299 iscsit_inc_conn_usage_count(l_conn);
4303 spin_unlock_bh(&sess->conn_lock);
4309 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4311 spin_lock_bh(&l_conn->state_lock);
4312 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4313 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4314 spin_unlock_bh(&l_conn->state_lock);
4316 iscsit_cause_connection_reinstatement(l_conn, 1);
4317 iscsit_dec_conn_usage_count(l_conn);
4321 * Return of 0 causes the TX thread to restart.
4323 static int iscsit_logout_post_handler(
4324 struct iscsi_cmd *cmd,
4325 struct iscsi_conn *conn)
4329 switch (cmd->logout_reason) {
4330 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4331 switch (cmd->logout_response) {
4332 case ISCSI_LOGOUT_SUCCESS:
4333 case ISCSI_LOGOUT_CLEANUP_FAILED:
4335 iscsit_logout_post_handler_closesession(conn);
4340 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4341 if (conn->cid == cmd->logout_cid) {
4342 switch (cmd->logout_response) {
4343 case ISCSI_LOGOUT_SUCCESS:
4344 case ISCSI_LOGOUT_CLEANUP_FAILED:
4346 iscsit_logout_post_handler_samecid(conn);
4351 switch (cmd->logout_response) {
4352 case ISCSI_LOGOUT_SUCCESS:
4353 iscsit_logout_post_handler_diffcid(conn,
4356 case ISCSI_LOGOUT_CID_NOT_FOUND:
4357 case ISCSI_LOGOUT_CLEANUP_FAILED:
4364 case ISCSI_LOGOUT_REASON_RECOVERY:
4365 switch (cmd->logout_response) {
4366 case ISCSI_LOGOUT_SUCCESS:
4367 case ISCSI_LOGOUT_CID_NOT_FOUND:
4368 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4369 case ISCSI_LOGOUT_CLEANUP_FAILED:
4382 void iscsit_fail_session(struct iscsi_session *sess)
4384 struct iscsi_conn *conn;
4386 spin_lock_bh(&sess->conn_lock);
4387 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4388 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4389 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4391 spin_unlock_bh(&sess->conn_lock);
4393 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4394 sess->session_state = TARG_SESS_STATE_FAILED;
4397 int iscsit_free_session(struct iscsi_session *sess)
4399 u16 conn_count = atomic_read(&sess->nconn);
4400 struct iscsi_conn *conn, *conn_tmp = NULL;
4403 spin_lock_bh(&sess->conn_lock);
4404 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4406 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4408 if (conn_count == 0)
4411 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4414 iscsit_inc_conn_usage_count(conn_tmp);
4417 iscsit_inc_conn_usage_count(conn);
4419 spin_unlock_bh(&sess->conn_lock);
4420 iscsit_cause_connection_reinstatement(conn, 1);
4421 spin_lock_bh(&sess->conn_lock);
4423 iscsit_dec_conn_usage_count(conn);
4425 iscsit_dec_conn_usage_count(conn_tmp);
4430 if (atomic_read(&sess->nconn)) {
4431 spin_unlock_bh(&sess->conn_lock);
4432 wait_for_completion(&sess->session_wait_comp);
4434 spin_unlock_bh(&sess->conn_lock);
4436 iscsit_close_session(sess);
4440 void iscsit_stop_session(
4441 struct iscsi_session *sess,
4443 int connection_sleep)
4445 u16 conn_count = atomic_read(&sess->nconn);
4446 struct iscsi_conn *conn, *conn_tmp = NULL;
4449 spin_lock_bh(&sess->conn_lock);
4451 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4453 if (connection_sleep) {
4454 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4456 if (conn_count == 0)
4459 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4462 iscsit_inc_conn_usage_count(conn_tmp);
4465 iscsit_inc_conn_usage_count(conn);
4467 spin_unlock_bh(&sess->conn_lock);
4468 iscsit_cause_connection_reinstatement(conn, 1);
4469 spin_lock_bh(&sess->conn_lock);
4471 iscsit_dec_conn_usage_count(conn);
4473 iscsit_dec_conn_usage_count(conn_tmp);
4477 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4478 iscsit_cause_connection_reinstatement(conn, 0);
4481 if (session_sleep && atomic_read(&sess->nconn)) {
4482 spin_unlock_bh(&sess->conn_lock);
4483 wait_for_completion(&sess->session_wait_comp);
4485 spin_unlock_bh(&sess->conn_lock);
4488 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4490 struct iscsi_session *sess;
4491 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4492 struct se_session *se_sess, *se_sess_tmp;
4493 int session_count = 0;
4495 spin_lock_bh(&se_tpg->session_lock);
4496 if (tpg->nsessions && !force) {
4497 spin_unlock_bh(&se_tpg->session_lock);
4501 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4503 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4505 spin_lock(&sess->conn_lock);
4506 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4507 atomic_read(&sess->session_logout) ||
4508 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4509 spin_unlock(&sess->conn_lock);
4512 atomic_set(&sess->session_reinstatement, 1);
4513 spin_unlock(&sess->conn_lock);
4514 spin_unlock_bh(&se_tpg->session_lock);
4516 iscsit_free_session(sess);
4517 spin_lock_bh(&se_tpg->session_lock);
4521 spin_unlock_bh(&se_tpg->session_lock);
4523 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4524 " Group: %hu\n", session_count, tpg->tpgt);
4528 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4529 MODULE_VERSION("4.1.x");
4530 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4531 MODULE_LICENSE("GPL");
4533 module_init(iscsi_target_init_module);
4534 module_exit(iscsi_target_cleanup_module);