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 <linux/module.h>
26 #include <linux/idr.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/iscsi_proto.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_SPINLOCK(np_lock);
55 static struct idr tiqn_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
60 struct iscsit_global *iscsit_global;
62 struct kmem_cache *lio_cmd_cache;
63 struct kmem_cache *lio_qr_cache;
64 struct kmem_cache *lio_dr_cache;
65 struct kmem_cache *lio_ooo_cache;
66 struct kmem_cache *lio_r2t_cache;
68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
69 unsigned char *buf, u32);
70 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 struct iscsi_tiqn *tiqn = NULL;
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
87 spin_unlock(&tiqn->tiqn_state_lock);
90 spin_unlock(&tiqn_lock);
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
103 spin_unlock(&tiqn->tiqn_state_lock);
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 struct iscsi_tiqn *tiqn = NULL;
124 if (strlen(buf) >= ISCSI_IQN_LEN) {
125 pr_err("Target IQN exceeds %d bytes\n",
127 return ERR_PTR(-EINVAL);
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
145 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
146 pr_err("idr_pre_get() for tiqn_idr failed\n");
148 return ERR_PTR(-ENOMEM);
150 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
152 spin_lock(&tiqn_lock);
153 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
155 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
156 spin_unlock(&tiqn_lock);
160 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
161 spin_unlock(&tiqn_lock);
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172 * Wait for accesses to said struct iscsi_tiqn to end.
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
178 spin_lock(&tiqn->tiqn_state_lock);
180 spin_unlock(&tiqn->tiqn_state_lock);
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
196 iscsit_wait_for_tiqn(tiqn);
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
212 * Determine if the network portal is accepting storage traffic.
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
219 if (np->np_login_tpg) {
220 pr_err("np->np_login_tpg() is not NULL!\n");
221 spin_unlock_bh(&np->np_thread_lock);
224 spin_unlock_bh(&np->np_thread_lock);
226 * Determine if the portal group is accepting storage traffic.
228 spin_lock_bh(&tpg->tpg_state_lock);
229 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
230 spin_unlock_bh(&tpg->tpg_state_lock);
233 spin_unlock_bh(&tpg->tpg_state_lock);
236 * Here we serialize access across the TIQN+TPG Tuple.
238 ret = mutex_lock_interruptible(&tpg->np_login_lock);
239 if ((ret != 0) || signal_pending(current))
242 spin_lock_bh(&np->np_thread_lock);
243 np->np_login_tpg = tpg;
244 spin_unlock_bh(&np->np_thread_lock);
249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
253 spin_lock_bh(&np->np_thread_lock);
254 np->np_login_tpg = NULL;
255 spin_unlock_bh(&np->np_thread_lock);
257 mutex_unlock(&tpg->np_login_lock);
260 iscsit_put_tiqn_for_login(tiqn);
265 static struct iscsi_np *iscsit_get_np(
266 struct __kernel_sockaddr_storage *sockaddr,
267 int network_transport)
269 struct sockaddr_in *sock_in, *sock_in_e;
270 struct sockaddr_in6 *sock_in6, *sock_in6_e;
275 spin_lock_bh(&np_lock);
276 list_for_each_entry(np, &g_np_list, np_list) {
277 spin_lock(&np->np_thread_lock);
278 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
279 spin_unlock(&np->np_thread_lock);
283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
287 if (!memcmp(&sock_in6->sin6_addr.in6_u,
288 &sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
292 port = ntohs(sock_in6->sin6_port);
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
297 if (sock_in->sin_addr.s_addr ==
298 sock_in_e->sin_addr.s_addr)
301 port = ntohs(sock_in->sin_port);
304 if ((ip_match == 1) && (np->np_port == port) &&
305 (np->np_network_transport == network_transport)) {
307 * Increment the np_exports reference count now to
308 * prevent iscsit_del_np() below from being called
309 * while iscsi_tpg_add_network_portal() is called.
312 spin_unlock(&np->np_thread_lock);
313 spin_unlock_bh(&np_lock);
316 spin_unlock(&np->np_thread_lock);
318 spin_unlock_bh(&np_lock);
323 struct iscsi_np *iscsit_add_np(
324 struct __kernel_sockaddr_storage *sockaddr,
326 int network_transport)
328 struct sockaddr_in *sock_in;
329 struct sockaddr_in6 *sock_in6;
333 * Locate the existing struct iscsi_np if already active..
335 np = iscsit_get_np(sockaddr, network_transport);
339 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
341 pr_err("Unable to allocate memory for struct iscsi_np\n");
342 return ERR_PTR(-ENOMEM);
345 np->np_flags |= NPF_IP_NETWORK;
346 if (sockaddr->ss_family == AF_INET6) {
347 sock_in6 = (struct sockaddr_in6 *)sockaddr;
348 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
349 np->np_port = ntohs(sock_in6->sin6_port);
351 sock_in = (struct sockaddr_in *)sockaddr;
352 sprintf(np->np_ip, "%s", ip_str);
353 np->np_port = ntohs(sock_in->sin_port);
356 np->np_network_transport = network_transport;
357 spin_lock_init(&np->np_thread_lock);
358 init_completion(&np->np_restart_comp);
359 INIT_LIST_HEAD(&np->np_list);
361 ret = iscsi_target_setup_login_socket(np, sockaddr);
367 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
368 if (IS_ERR(np->np_thread)) {
369 pr_err("Unable to create kthread: iscsi_np\n");
370 ret = PTR_ERR(np->np_thread);
375 * Increment the np_exports reference count now to prevent
376 * iscsit_del_np() below from being run while a new call to
377 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
378 * active. We don't need to hold np->np_thread_lock at this
379 * point because iscsi_np has not been added to g_np_list yet.
383 spin_lock_bh(&np_lock);
384 list_add_tail(&np->np_list, &g_np_list);
385 spin_unlock_bh(&np_lock);
387 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
388 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
394 int iscsit_reset_np_thread(
396 struct iscsi_tpg_np *tpg_np,
397 struct iscsi_portal_group *tpg)
399 spin_lock_bh(&np->np_thread_lock);
402 * The reset operation need only be performed when the
403 * passed struct iscsi_portal_group has a login in progress
404 * to one of the network portals.
406 if (tpg_np->tpg_np->np_login_tpg != tpg) {
407 spin_unlock_bh(&np->np_thread_lock);
411 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
412 spin_unlock_bh(&np->np_thread_lock);
415 np->np_thread_state = ISCSI_NP_THREAD_RESET;
418 spin_unlock_bh(&np->np_thread_lock);
419 send_sig(SIGINT, np->np_thread, 1);
420 wait_for_completion(&np->np_restart_comp);
421 spin_lock_bh(&np->np_thread_lock);
423 spin_unlock_bh(&np->np_thread_lock);
428 int iscsit_del_np_comm(struct iscsi_np *np)
434 * Some network transports allocate their own struct sock->file,
435 * see if we need to free any additional allocated resources.
437 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
438 kfree(np->np_socket->file);
439 np->np_socket->file = NULL;
442 sock_release(np->np_socket);
446 int iscsit_del_np(struct iscsi_np *np)
448 spin_lock_bh(&np->np_thread_lock);
450 if (np->np_exports) {
451 spin_unlock_bh(&np->np_thread_lock);
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
465 iscsit_del_np_comm(np);
467 spin_lock_bh(&np_lock);
468 list_del(&np->np_list);
469 spin_unlock_bh(&np_lock);
471 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
472 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
479 static int __init iscsi_target_init_module(void)
483 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
485 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
486 if (!iscsit_global) {
487 pr_err("Unable to allocate memory for iscsit_global\n");
490 mutex_init(&auth_id_lock);
491 spin_lock_init(&sess_idr_lock);
495 ret = iscsi_target_register_configfs();
499 ret = iscsi_thread_set_init();
503 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
504 TARGET_THREAD_SET_COUNT) {
505 pr_err("iscsi_allocate_thread_sets() returned"
506 " unexpected value!\n");
510 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
511 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
513 if (!lio_cmd_cache) {
514 pr_err("Unable to kmem_cache_create() for"
519 lio_qr_cache = kmem_cache_create("lio_qr_cache",
520 sizeof(struct iscsi_queue_req),
521 __alignof__(struct iscsi_queue_req), 0, NULL);
523 pr_err("nable to kmem_cache_create() for"
528 lio_dr_cache = kmem_cache_create("lio_dr_cache",
529 sizeof(struct iscsi_datain_req),
530 __alignof__(struct iscsi_datain_req), 0, NULL);
532 pr_err("Unable to kmem_cache_create() for"
537 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
538 sizeof(struct iscsi_ooo_cmdsn),
539 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
540 if (!lio_ooo_cache) {
541 pr_err("Unable to kmem_cache_create() for"
546 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
547 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
549 if (!lio_r2t_cache) {
550 pr_err("Unable to kmem_cache_create() for"
555 if (iscsit_load_discovery_tpg() < 0)
560 kmem_cache_destroy(lio_r2t_cache);
562 kmem_cache_destroy(lio_ooo_cache);
564 kmem_cache_destroy(lio_dr_cache);
566 kmem_cache_destroy(lio_qr_cache);
568 kmem_cache_destroy(lio_cmd_cache);
570 iscsi_deallocate_thread_sets();
572 iscsi_thread_set_free();
574 iscsi_target_deregister_configfs();
576 kfree(iscsit_global);
580 static void __exit iscsi_target_cleanup_module(void)
582 iscsi_deallocate_thread_sets();
583 iscsi_thread_set_free();
584 iscsit_release_discovery_tpg();
585 kmem_cache_destroy(lio_cmd_cache);
586 kmem_cache_destroy(lio_qr_cache);
587 kmem_cache_destroy(lio_dr_cache);
588 kmem_cache_destroy(lio_ooo_cache);
589 kmem_cache_destroy(lio_r2t_cache);
591 iscsi_target_deregister_configfs();
593 kfree(iscsit_global);
596 int iscsit_add_reject(
600 struct iscsi_conn *conn)
602 struct iscsi_cmd *cmd;
603 struct iscsi_reject *hdr;
606 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
610 cmd->iscsi_opcode = ISCSI_OP_REJECT;
612 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
614 hdr = (struct iscsi_reject *) cmd->pdu;
615 hdr->reason = reason;
617 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
619 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
620 iscsit_release_cmd(cmd);
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 = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
665 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
666 iscsit_release_cmd(cmd);
671 spin_lock_bh(&conn->cmd_lock);
672 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
673 spin_unlock_bh(&conn->cmd_lock);
676 cmd->i_state = ISTATE_SEND_REJECT;
677 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
679 ret = wait_for_completion_interruptible(&cmd->reject_comp);
683 return (!fail_conn) ? 0 : -1;
687 * Map some portion of the allocated scatterlist to an iovec, suitable for
688 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
689 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
690 * either case (see iscsit_alloc_buffs)
692 static int iscsit_map_iovec(
693 struct iscsi_cmd *cmd,
699 struct scatterlist *sg;
700 unsigned int page_off;
703 * We have a private mapping of the allocated pages in t_mem_sg.
704 * At this point, we also know each contains a page.
706 sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
707 page_off = (data_offset % PAGE_SIZE);
709 cmd->first_data_sg = sg;
710 cmd->first_data_sg_off = page_off;
712 while (data_length) {
713 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
715 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
716 iov[i].iov_len = cur_len;
718 data_length -= cur_len;
724 cmd->kmapped_nents = i;
729 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
732 struct scatterlist *sg;
734 sg = cmd->first_data_sg;
736 for (i = 0; i < cmd->kmapped_nents; i++)
737 kunmap(sg_page(&sg[i]));
740 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
742 struct iscsi_cmd *cmd;
744 conn->exp_statsn = exp_statsn;
746 spin_lock_bh(&conn->cmd_lock);
747 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
748 spin_lock(&cmd->istate_lock);
749 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
750 (cmd->stat_sn < exp_statsn)) {
751 cmd->i_state = ISTATE_REMOVE;
752 spin_unlock(&cmd->istate_lock);
753 iscsit_add_cmd_to_immediate_queue(cmd, conn,
757 spin_unlock(&cmd->istate_lock);
759 spin_unlock_bh(&conn->cmd_lock);
762 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
764 u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
765 cmd->se_cmd.t_data_nents;
767 iov_count += ISCSI_IOV_DATA_BUFFER;
769 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
770 if (!cmd->iov_data) {
771 pr_err("Unable to allocate cmd->iov_data\n");
775 cmd->orig_iov_data_count = iov_count;
779 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
781 struct scatterlist *sgl;
782 u32 length = cmd->se_cmd.data_length;
783 int nents = DIV_ROUND_UP(length, PAGE_SIZE);
784 int i = 0, j = 0, ret;
786 * If no SCSI payload is present, allocate the default iovecs used for
790 return iscsit_allocate_iovecs(cmd);
792 sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
796 sg_init_table(sgl, nents);
799 int buf_size = min_t(int, length, PAGE_SIZE);
802 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
804 goto page_alloc_failed;
806 sg_set_page(&sgl[i], page, buf_size, 0);
813 cmd->t_mem_sg_nents = nents;
815 /* BIDI ops not supported */
817 /* Tell the core about our preallocated memory */
818 transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
820 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
821 * so that cmd->se_cmd.t_tasks_se_num has been set.
823 ret = iscsit_allocate_iovecs(cmd);
831 __free_page(sg_page(&sgl[j++]));
837 static int iscsit_handle_scsi_cmd(
838 struct iscsi_conn *conn,
841 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
842 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
843 struct iscsi_cmd *cmd = NULL;
844 struct iscsi_scsi_req *hdr;
846 spin_lock_bh(&conn->sess->session_stats_lock);
847 conn->sess->cmd_pdus++;
848 if (conn->sess->se_sess->se_node_acl) {
849 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
850 conn->sess->se_sess->se_node_acl->num_cmds++;
851 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
853 spin_unlock_bh(&conn->sess->session_stats_lock);
855 hdr = (struct iscsi_scsi_req *) buf;
856 payload_length = ntoh24(hdr->dlength);
857 hdr->itt = be32_to_cpu(hdr->itt);
858 hdr->data_length = be32_to_cpu(hdr->data_length);
859 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
860 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
862 /* FIXME; Add checks for AdditionalHeaderSegment */
864 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
865 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
866 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
867 " not set. Bad iSCSI Initiator.\n");
868 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
872 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
873 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
875 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
876 * that adds support for RESERVE/RELEASE. There is a bug
877 * add with this new functionality that sets R/W bits when
878 * neither CDB carries any READ or WRITE datapayloads.
880 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
881 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
882 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
886 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
887 " set when Expected Data Transfer Length is 0 for"
888 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
889 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
894 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
895 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
896 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
897 " MUST be set if Expected Data Transfer Length is not 0."
898 " Bad iSCSI Initiator\n");
899 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
903 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
904 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
905 pr_err("Bidirectional operations not supported!\n");
906 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
910 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
911 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
912 " Scsi Command PDU.\n");
913 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
917 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
918 pr_err("ImmediateData=No but DataSegmentLength=%u,"
919 " protocol error.\n", payload_length);
920 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
924 if ((hdr->data_length == payload_length) &&
925 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
926 pr_err("Expected Data Transfer Length and Length of"
927 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
928 " bit is not set protocol error\n");
929 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
933 if (payload_length > hdr->data_length) {
934 pr_err("DataSegmentLength: %u is greater than"
935 " EDTL: %u, protocol error.\n", payload_length,
937 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
941 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
942 pr_err("DataSegmentLength: %u is greater than"
943 " MaxRecvDataSegmentLength: %u, protocol error.\n",
944 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
945 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
949 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
950 pr_err("DataSegmentLength: %u is greater than"
951 " FirstBurstLength: %u, protocol error.\n",
952 payload_length, conn->sess->sess_ops->FirstBurstLength);
953 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
957 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
958 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
961 cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
962 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
964 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
967 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
968 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
969 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
971 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
972 cmd->i_state = ISTATE_NEW_CMD;
973 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
974 cmd->immediate_data = (payload_length) ? 1 : 0;
975 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
976 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
977 if (cmd->unsolicited_data)
978 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
980 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
981 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
982 spin_lock_bh(&conn->sess->ttt_lock);
983 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
984 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
985 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
986 spin_unlock_bh(&conn->sess->ttt_lock);
987 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
988 cmd->targ_xfer_tag = 0xFFFFFFFF;
989 cmd->cmd_sn = hdr->cmdsn;
990 cmd->exp_stat_sn = hdr->exp_statsn;
991 cmd->first_burst_len = payload_length;
993 if (cmd->data_direction == DMA_FROM_DEVICE) {
994 struct iscsi_datain_req *dr;
996 dr = iscsit_allocate_datain_req();
998 return iscsit_add_reject_from_cmd(
999 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1002 iscsit_attach_datain_req(cmd, dr);
1006 * The CDB is going to an se_device_t.
1008 ret = transport_lookup_cmd_lun(&cmd->se_cmd,
1009 scsilun_to_int(&hdr->lun));
1011 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1012 pr_debug("Responding to non-acl'ed,"
1013 " non-existent or non-exported iSCSI LUN:"
1014 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1016 send_check_condition = 1;
1020 * The Initiator Node has access to the LUN (the addressing method
1021 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1022 * allocate 1->N transport tasks (depending on sector count and
1023 * maximum request size the physical HBA(s) can handle.
1025 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1026 if (transport_ret == -ENOMEM) {
1027 return iscsit_add_reject_from_cmd(
1028 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1030 } else if (transport_ret < 0) {
1032 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1033 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1036 send_check_condition = 1;
1038 cmd->data_length = cmd->se_cmd.data_length;
1040 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1041 return iscsit_add_reject_from_cmd(
1042 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1047 spin_lock_bh(&conn->cmd_lock);
1048 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1049 spin_unlock_bh(&conn->cmd_lock);
1051 * Check if we need to delay processing because of ALUA
1052 * Active/NonOptimized primary access state..
1054 core_alua_check_nonop_delay(&cmd->se_cmd);
1056 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1057 * also call iscsit_allocate_iovecs()
1059 ret = iscsit_alloc_buffs(cmd);
1061 return iscsit_add_reject_from_cmd(
1062 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1065 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1066 * the Immediate Bit is not set, and no Immediate
1069 * A PDU/CmdSN carrying Immediate Data can only
1070 * be processed after the DataCRC has passed.
1071 * If the DataCRC fails, the CmdSN MUST NOT
1072 * be acknowledged. (See below)
1074 if (!cmd->immediate_data) {
1075 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1076 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1078 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1079 return iscsit_add_reject_from_cmd(
1080 ISCSI_REASON_PROTOCOL_ERROR,
1084 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1087 * If no Immediate Data is attached, it's OK to return now.
1089 if (!cmd->immediate_data) {
1090 if (send_check_condition)
1093 if (cmd->unsolicited_data) {
1094 iscsit_set_dataout_sequence_values(cmd);
1096 spin_lock_bh(&cmd->dataout_timeout_lock);
1097 iscsit_start_dataout_timer(cmd, cmd->conn);
1098 spin_unlock_bh(&cmd->dataout_timeout_lock);
1105 * Early CHECK_CONDITIONs never make it to the transport processing
1106 * thread. They are processed in CmdSN order by
1107 * iscsit_check_received_cmdsn() below.
1109 if (send_check_condition) {
1110 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1111 dump_immediate_data = 1;
1112 goto after_immediate_data;
1115 * Call directly into transport_generic_new_cmd() to perform
1116 * the backend memory allocation.
1118 ret = transport_generic_new_cmd(&cmd->se_cmd);
1120 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1121 dump_immediate_data = 1;
1122 goto after_immediate_data;
1125 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1126 after_immediate_data:
1127 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1129 * A PDU/CmdSN carrying Immediate Data passed
1130 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1131 * Immediate Bit is not set.
1133 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1135 * Special case for Unsupported SAM WRITE Opcodes
1136 * and ImmediateData=Yes.
1138 if (dump_immediate_data) {
1139 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1141 } else if (cmd->unsolicited_data) {
1142 iscsit_set_dataout_sequence_values(cmd);
1144 spin_lock_bh(&cmd->dataout_timeout_lock);
1145 iscsit_start_dataout_timer(cmd, cmd->conn);
1146 spin_unlock_bh(&cmd->dataout_timeout_lock);
1149 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1150 return iscsit_add_reject_from_cmd(
1151 ISCSI_REASON_PROTOCOL_ERROR,
1154 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1156 * Immediate Data failed DataCRC and ERL>=1,
1157 * silently drop this PDU and let the initiator
1158 * plug the CmdSN gap.
1160 * FIXME: Send Unsolicited NOPIN with reserved
1161 * TTT here to help the initiator figure out
1162 * the missing CmdSN, although they should be
1163 * intelligent enough to determine the missing
1164 * CmdSN and issue a retry to plug the sequence.
1166 cmd->i_state = ISTATE_REMOVE;
1167 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1168 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1174 static u32 iscsit_do_crypto_hash_sg(
1175 struct hash_desc *hash,
1176 struct iscsi_cmd *cmd,
1184 struct scatterlist *sg;
1185 unsigned int page_off;
1187 crypto_hash_init(hash);
1189 sg = cmd->first_data_sg;
1190 page_off = cmd->first_data_sg_off;
1193 while (data_length) {
1194 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1196 crypto_hash_update(hash, &sg[i], cur_len);
1198 data_length -= cur_len;
1204 struct scatterlist pad_sg;
1206 sg_init_one(&pad_sg, pad_bytes, padding);
1207 crypto_hash_update(hash, &pad_sg, padding);
1209 crypto_hash_final(hash, (u8 *) &data_crc);
1214 static void iscsit_do_crypto_hash_buf(
1215 struct hash_desc *hash,
1222 struct scatterlist sg;
1224 crypto_hash_init(hash);
1226 sg_init_one(&sg, buf, payload_length);
1227 crypto_hash_update(hash, &sg, payload_length);
1230 sg_init_one(&sg, pad_bytes, padding);
1231 crypto_hash_update(hash, &sg, padding);
1233 crypto_hash_final(hash, data_crc);
1236 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1238 int iov_ret, ooo_cmdsn = 0, ret;
1239 u8 data_crc_failed = 0;
1240 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1241 u32 rx_size = 0, payload_length;
1242 struct iscsi_cmd *cmd = NULL;
1243 struct se_cmd *se_cmd;
1244 struct iscsi_data *hdr;
1246 unsigned long flags;
1248 hdr = (struct iscsi_data *) buf;
1249 payload_length = ntoh24(hdr->dlength);
1250 hdr->itt = be32_to_cpu(hdr->itt);
1251 hdr->ttt = be32_to_cpu(hdr->ttt);
1252 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1253 hdr->datasn = be32_to_cpu(hdr->datasn);
1254 hdr->offset = be32_to_cpu(hdr->offset);
1256 if (!payload_length) {
1257 pr_err("DataOUT payload is ZERO, protocol error.\n");
1258 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1263 spin_lock_bh(&conn->sess->session_stats_lock);
1264 conn->sess->rx_data_octets += payload_length;
1265 if (conn->sess->se_sess->se_node_acl) {
1266 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1267 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1268 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1270 spin_unlock_bh(&conn->sess->session_stats_lock);
1272 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1273 pr_err("DataSegmentLength: %u is greater than"
1274 " MaxRecvDataSegmentLength: %u\n", payload_length,
1275 conn->conn_ops->MaxRecvDataSegmentLength);
1276 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1280 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1285 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1286 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1287 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1288 payload_length, conn->cid);
1290 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1291 pr_err("Command ITT: 0x%08x received DataOUT after"
1292 " last DataOUT received, dumping payload\n",
1293 cmd->init_task_tag);
1294 return iscsit_dump_data_payload(conn, payload_length, 1);
1297 if (cmd->data_direction != DMA_TO_DEVICE) {
1298 pr_err("Command ITT: 0x%08x received DataOUT for a"
1299 " NON-WRITE command.\n", cmd->init_task_tag);
1300 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1303 se_cmd = &cmd->se_cmd;
1304 iscsit_mod_dataout_timer(cmd);
1306 if ((hdr->offset + payload_length) > cmd->data_length) {
1307 pr_err("DataOut Offset: %u, Length %u greater than"
1308 " iSCSI Command EDTL %u, protocol error.\n",
1309 hdr->offset, payload_length, cmd->data_length);
1310 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1314 if (cmd->unsolicited_data) {
1315 int dump_unsolicited_data = 0;
1317 if (conn->sess->sess_ops->InitialR2T) {
1318 pr_err("Received unexpected unsolicited data"
1319 " while InitialR2T=Yes, protocol error.\n");
1320 transport_send_check_condition_and_sense(&cmd->se_cmd,
1321 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1325 * Special case for dealing with Unsolicited DataOUT
1326 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1330 /* Something's amiss if we're not in WRITE_PENDING state... */
1331 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1332 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1333 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1335 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1336 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1337 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1338 dump_unsolicited_data = 1;
1339 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1341 if (dump_unsolicited_data) {
1343 * Check if a delayed TASK_ABORTED status needs to
1344 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1345 * received with the unsolicitied data out.
1347 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1348 iscsit_stop_dataout_timer(cmd);
1350 transport_check_aborted_status(se_cmd,
1351 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1352 return iscsit_dump_data_payload(conn, payload_length, 1);
1356 * For the normal solicited data path:
1358 * Check for a delayed TASK_ABORTED status and dump any
1359 * incoming data out payload if one exists. Also, when the
1360 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1361 * data out sequence, we decrement outstanding_r2ts. Once
1362 * outstanding_r2ts reaches zero, go ahead and send the delayed
1363 * TASK_ABORTED status.
1365 if (se_cmd->transport_state & CMD_T_ABORTED) {
1366 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1367 if (--cmd->outstanding_r2ts < 1) {
1368 iscsit_stop_dataout_timer(cmd);
1369 transport_check_aborted_status(
1373 return iscsit_dump_data_payload(conn, payload_length, 1);
1377 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1378 * within-command recovery checks before receiving the payload.
1380 ret = iscsit_check_pre_dataout(cmd, buf);
1381 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1383 else if (ret == DATAOUT_CANNOT_RECOVER)
1386 rx_size += payload_length;
1387 iov = &cmd->iov_data[0];
1389 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1393 iov_count += iov_ret;
1395 padding = ((-payload_length) & 3);
1397 iov[iov_count].iov_base = cmd->pad_bytes;
1398 iov[iov_count++].iov_len = padding;
1400 pr_debug("Receiving %u padding bytes.\n", padding);
1403 if (conn->conn_ops->DataDigest) {
1404 iov[iov_count].iov_base = &checksum;
1405 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1406 rx_size += ISCSI_CRC_LEN;
1409 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1411 iscsit_unmap_iovec(cmd);
1413 if (rx_got != rx_size)
1416 if (conn->conn_ops->DataDigest) {
1419 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1420 hdr->offset, payload_length, padding,
1423 if (checksum != data_crc) {
1424 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1425 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1426 " does not match computed 0x%08x\n",
1427 hdr->itt, hdr->offset, payload_length,
1428 hdr->datasn, checksum, data_crc);
1429 data_crc_failed = 1;
1431 pr_debug("Got CRC32C DataDigest 0x%08x for"
1432 " %u bytes of Data Out\n", checksum,
1437 * Increment post receive data and CRC values or perform
1438 * within-command recovery.
1440 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1441 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1443 else if (ret == DATAOUT_SEND_R2T) {
1444 iscsit_set_dataout_sequence_values(cmd);
1445 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1446 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1448 * Handle extra special case for out of order
1449 * Unsolicited Data Out.
1451 spin_lock_bh(&cmd->istate_lock);
1452 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1453 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1454 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1455 spin_unlock_bh(&cmd->istate_lock);
1457 iscsit_stop_dataout_timer(cmd);
1458 return (!ooo_cmdsn) ? transport_generic_handle_data(
1460 } else /* DATAOUT_CANNOT_RECOVER */
1466 static int iscsit_handle_nop_out(
1467 struct iscsi_conn *conn,
1470 unsigned char *ping_data = NULL;
1471 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1472 u32 checksum, data_crc, padding = 0, payload_length;
1473 struct iscsi_cmd *cmd = NULL;
1474 struct kvec *iov = NULL;
1475 struct iscsi_nopout *hdr;
1477 hdr = (struct iscsi_nopout *) buf;
1478 payload_length = ntoh24(hdr->dlength);
1479 hdr->itt = be32_to_cpu(hdr->itt);
1480 hdr->ttt = be32_to_cpu(hdr->ttt);
1481 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1482 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1484 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1485 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1486 " not set, protocol error.\n");
1487 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1491 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1492 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1493 " greater than MaxRecvDataSegmentLength: %u, protocol"
1494 " error.\n", payload_length,
1495 conn->conn_ops->MaxRecvDataSegmentLength);
1496 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1500 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1501 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1502 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1503 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1506 * This is not a response to a Unsolicited NopIN, which means
1507 * it can either be a NOPOUT ping request (with a valid ITT),
1508 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1509 * Either way, make sure we allocate an struct iscsi_cmd, as both
1510 * can contain ping data.
1512 if (hdr->ttt == 0xFFFFFFFF) {
1513 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1515 return iscsit_add_reject(
1516 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1519 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1520 cmd->i_state = ISTATE_SEND_NOPIN;
1521 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1523 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1524 cmd->targ_xfer_tag = 0xFFFFFFFF;
1525 cmd->cmd_sn = hdr->cmdsn;
1526 cmd->exp_stat_sn = hdr->exp_statsn;
1527 cmd->data_direction = DMA_NONE;
1530 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1531 rx_size = payload_length;
1532 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1534 pr_err("Unable to allocate memory for"
1535 " NOPOUT ping data.\n");
1540 iov = &cmd->iov_misc[0];
1541 iov[niov].iov_base = ping_data;
1542 iov[niov++].iov_len = payload_length;
1544 padding = ((-payload_length) & 3);
1546 pr_debug("Receiving %u additional bytes"
1547 " for padding.\n", padding);
1548 iov[niov].iov_base = &cmd->pad_bytes;
1549 iov[niov++].iov_len = padding;
1552 if (conn->conn_ops->DataDigest) {
1553 iov[niov].iov_base = &checksum;
1554 iov[niov++].iov_len = ISCSI_CRC_LEN;
1555 rx_size += ISCSI_CRC_LEN;
1558 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1559 if (rx_got != rx_size) {
1564 if (conn->conn_ops->DataDigest) {
1565 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1566 ping_data, payload_length,
1567 padding, cmd->pad_bytes,
1570 if (checksum != data_crc) {
1571 pr_err("Ping data CRC32C DataDigest"
1572 " 0x%08x does not match computed 0x%08x\n",
1573 checksum, data_crc);
1574 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1575 pr_err("Unable to recover from"
1576 " NOPOUT Ping DataCRC failure while in"
1582 * Silently drop this PDU and let the
1583 * initiator plug the CmdSN gap.
1585 pr_debug("Dropping NOPOUT"
1586 " Command CmdSN: 0x%08x due to"
1587 " DataCRC error.\n", hdr->cmdsn);
1592 pr_debug("Got CRC32C DataDigest"
1593 " 0x%08x for %u bytes of ping data.\n",
1594 checksum, payload_length);
1598 ping_data[payload_length] = '\0';
1600 * Attach ping data to struct iscsi_cmd->buf_ptr.
1602 cmd->buf_ptr = ping_data;
1603 cmd->buf_ptr_size = payload_length;
1605 pr_debug("Got %u bytes of NOPOUT ping"
1606 " data.\n", payload_length);
1607 pr_debug("Ping Data: \"%s\"\n", ping_data);
1610 if (hdr->itt != 0xFFFFFFFF) {
1612 pr_err("Checking CmdSN for NOPOUT,"
1613 " but cmd is NULL!\n");
1617 * Initiator is expecting a NopIN ping reply,
1619 spin_lock_bh(&conn->cmd_lock);
1620 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1621 spin_unlock_bh(&conn->cmd_lock);
1623 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1625 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1626 iscsit_add_cmd_to_response_queue(cmd, conn,
1631 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1632 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1636 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1637 return iscsit_add_reject_from_cmd(
1638 ISCSI_REASON_PROTOCOL_ERROR,
1644 if (hdr->ttt != 0xFFFFFFFF) {
1646 * This was a response to a unsolicited NOPIN ping.
1648 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1652 iscsit_stop_nopin_response_timer(conn);
1654 cmd->i_state = ISTATE_REMOVE;
1655 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1656 iscsit_start_nopin_timer(conn);
1659 * Initiator is not expecting a NOPIN is response.
1660 * Just ignore for now.
1662 * iSCSI v19-91 10.18
1663 * "A NOP-OUT may also be used to confirm a changed
1664 * ExpStatSN if another PDU will not be available
1674 iscsit_release_cmd(cmd);
1680 static int iscsit_handle_task_mgt_cmd(
1681 struct iscsi_conn *conn,
1684 struct iscsi_cmd *cmd;
1685 struct se_tmr_req *se_tmr;
1686 struct iscsi_tmr_req *tmr_req;
1687 struct iscsi_tm *hdr;
1688 int out_of_order_cmdsn = 0;
1692 hdr = (struct iscsi_tm *) buf;
1693 hdr->itt = be32_to_cpu(hdr->itt);
1694 hdr->rtt = be32_to_cpu(hdr->rtt);
1695 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1696 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1697 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1698 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1699 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1700 function = hdr->flags;
1702 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1703 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1704 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1705 hdr->rtt, hdr->refcmdsn, conn->cid);
1707 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1708 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1709 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1710 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1711 hdr->rtt = ISCSI_RESERVED_TAG;
1714 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1715 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1716 pr_err("Task Management Request TASK_REASSIGN not"
1717 " issued as immediate command, bad iSCSI Initiator"
1718 "implementation\n");
1719 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1722 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1723 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1724 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1726 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1728 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1731 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1732 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1733 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1734 cmd->init_task_tag = hdr->itt;
1735 cmd->targ_xfer_tag = 0xFFFFFFFF;
1736 cmd->cmd_sn = hdr->cmdsn;
1737 cmd->exp_stat_sn = hdr->exp_statsn;
1738 se_tmr = cmd->se_cmd.se_tmr_req;
1739 tmr_req = cmd->tmr_req;
1741 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1743 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1744 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1745 scsilun_to_int(&hdr->lun));
1747 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1748 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1754 case ISCSI_TM_FUNC_ABORT_TASK:
1755 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1756 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1757 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1761 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1762 case ISCSI_TM_FUNC_CLEAR_ACA:
1763 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1764 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1766 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1767 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1768 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1769 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1773 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1774 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1775 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1776 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1780 case ISCSI_TM_FUNC_TASK_REASSIGN:
1781 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1783 * Perform sanity checks on the ExpDataSN only if the
1784 * TASK_REASSIGN was successful.
1786 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1789 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1790 return iscsit_add_reject_from_cmd(
1791 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1795 pr_err("Unknown TMR function: 0x%02x, protocol"
1796 " error.\n", function);
1797 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1798 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1802 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1803 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1804 se_tmr->call_transport = 1;
1806 spin_lock_bh(&conn->cmd_lock);
1807 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1808 spin_unlock_bh(&conn->cmd_lock);
1810 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1811 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1812 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1813 out_of_order_cmdsn = 1;
1814 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1816 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1817 return iscsit_add_reject_from_cmd(
1818 ISCSI_REASON_PROTOCOL_ERROR,
1821 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1823 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1826 * Found the referenced task, send to transport for processing.
1828 if (se_tmr->call_transport)
1829 return transport_generic_handle_tmr(&cmd->se_cmd);
1832 * Could not find the referenced LUN, task, or Task Management
1833 * command not authorized or supported. Change state and
1834 * let the tx_thread send the response.
1836 * For connection recovery, this is also the default action for
1837 * TMR TASK_REASSIGN.
1839 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1843 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1844 static int iscsit_handle_text_cmd(
1845 struct iscsi_conn *conn,
1848 char *text_ptr, *text_in;
1849 int cmdsn_ret, niov = 0, rx_got, rx_size;
1850 u32 checksum = 0, data_crc = 0, payload_length;
1851 u32 padding = 0, pad_bytes = 0, text_length = 0;
1852 struct iscsi_cmd *cmd;
1854 struct iscsi_text *hdr;
1856 hdr = (struct iscsi_text *) buf;
1857 payload_length = ntoh24(hdr->dlength);
1858 hdr->itt = be32_to_cpu(hdr->itt);
1859 hdr->ttt = be32_to_cpu(hdr->ttt);
1860 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1861 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1863 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1864 pr_err("Unable to accept text parameter length: %u"
1865 "greater than MaxRecvDataSegmentLength %u.\n",
1866 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1867 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1871 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1872 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1873 hdr->exp_statsn, payload_length);
1875 rx_size = text_length = payload_length;
1877 text_in = kzalloc(text_length, GFP_KERNEL);
1879 pr_err("Unable to allocate memory for"
1880 " incoming text parameters\n");
1884 memset(iov, 0, 3 * sizeof(struct kvec));
1885 iov[niov].iov_base = text_in;
1886 iov[niov++].iov_len = text_length;
1888 padding = ((-payload_length) & 3);
1890 iov[niov].iov_base = &pad_bytes;
1891 iov[niov++].iov_len = padding;
1893 pr_debug("Receiving %u additional bytes"
1894 " for padding.\n", padding);
1896 if (conn->conn_ops->DataDigest) {
1897 iov[niov].iov_base = &checksum;
1898 iov[niov++].iov_len = ISCSI_CRC_LEN;
1899 rx_size += ISCSI_CRC_LEN;
1902 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1903 if (rx_got != rx_size) {
1908 if (conn->conn_ops->DataDigest) {
1909 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1910 text_in, text_length,
1911 padding, (u8 *)&pad_bytes,
1914 if (checksum != data_crc) {
1915 pr_err("Text data CRC32C DataDigest"
1916 " 0x%08x does not match computed"
1917 " 0x%08x\n", checksum, data_crc);
1918 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1919 pr_err("Unable to recover from"
1920 " Text Data digest failure while in"
1926 * Silently drop this PDU and let the
1927 * initiator plug the CmdSN gap.
1929 pr_debug("Dropping Text"
1930 " Command CmdSN: 0x%08x due to"
1931 " DataCRC error.\n", hdr->cmdsn);
1936 pr_debug("Got CRC32C DataDigest"
1937 " 0x%08x for %u bytes of text data.\n",
1938 checksum, text_length);
1941 text_in[text_length - 1] = '\0';
1942 pr_debug("Successfully read %d bytes of text"
1943 " data.\n", text_length);
1945 if (strncmp("SendTargets", text_in, 11) != 0) {
1946 pr_err("Received Text Data that is not"
1947 " SendTargets, cannot continue.\n");
1951 text_ptr = strchr(text_in, '=');
1953 pr_err("No \"=\" separator found in Text Data,"
1954 " cannot continue.\n");
1958 if (strncmp("=All", text_ptr, 4) != 0) {
1959 pr_err("Unable to locate All value for"
1960 " SendTargets key, cannot continue.\n");
1964 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1968 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1970 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1973 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1974 cmd->i_state = ISTATE_SEND_TEXTRSP;
1975 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1976 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1977 cmd->targ_xfer_tag = 0xFFFFFFFF;
1978 cmd->cmd_sn = hdr->cmdsn;
1979 cmd->exp_stat_sn = hdr->exp_statsn;
1980 cmd->data_direction = DMA_NONE;
1982 spin_lock_bh(&conn->cmd_lock);
1983 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1984 spin_unlock_bh(&conn->cmd_lock);
1986 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1988 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1989 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1990 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1991 return iscsit_add_reject_from_cmd(
1992 ISCSI_REASON_PROTOCOL_ERROR,
1998 return iscsit_execute_cmd(cmd, 0);
2001 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2003 struct iscsi_conn *conn_p;
2004 struct iscsi_session *sess = conn->sess;
2006 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2007 " for SID: %u.\n", conn->cid, conn->sess->sid);
2009 atomic_set(&sess->session_logout, 1);
2010 atomic_set(&conn->conn_logout_remove, 1);
2011 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2013 iscsit_inc_conn_usage_count(conn);
2014 iscsit_inc_session_usage_count(sess);
2016 spin_lock_bh(&sess->conn_lock);
2017 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2018 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2021 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2022 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2024 spin_unlock_bh(&sess->conn_lock);
2026 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2031 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2033 struct iscsi_conn *l_conn;
2034 struct iscsi_session *sess = conn->sess;
2036 pr_debug("Received logout request CLOSECONNECTION for CID:"
2037 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2040 * A Logout Request with a CLOSECONNECTION reason code for a CID
2041 * can arrive on a connection with a differing CID.
2043 if (conn->cid == cmd->logout_cid) {
2044 spin_lock_bh(&conn->state_lock);
2045 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2046 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2048 atomic_set(&conn->conn_logout_remove, 1);
2049 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2050 iscsit_inc_conn_usage_count(conn);
2052 spin_unlock_bh(&conn->state_lock);
2055 * Handle all different cid CLOSECONNECTION requests in
2056 * iscsit_logout_post_handler_diffcid() as to give enough
2057 * time for any non immediate command's CmdSN to be
2058 * acknowledged on the connection in question.
2060 * Here we simply make sure the CID is still around.
2062 l_conn = iscsit_get_conn_from_cid(sess,
2065 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2066 iscsit_add_cmd_to_response_queue(cmd, conn,
2071 iscsit_dec_conn_usage_count(l_conn);
2074 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2079 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2081 struct iscsi_session *sess = conn->sess;
2083 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2084 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2086 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2087 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2088 " while ERL!=2.\n");
2089 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2090 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2094 if (conn->cid == cmd->logout_cid) {
2095 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2096 " with CID: %hu on CID: %hu, implementation error.\n",
2097 cmd->logout_cid, conn->cid);
2098 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2099 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2103 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2108 static int iscsit_handle_logout_cmd(
2109 struct iscsi_conn *conn,
2112 int cmdsn_ret, logout_remove = 0;
2114 struct iscsi_cmd *cmd;
2115 struct iscsi_logout *hdr;
2116 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2118 hdr = (struct iscsi_logout *) buf;
2119 reason_code = (hdr->flags & 0x7f);
2120 hdr->itt = be32_to_cpu(hdr->itt);
2121 hdr->cid = be16_to_cpu(hdr->cid);
2122 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2123 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2126 spin_lock(&tiqn->logout_stats.lock);
2127 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2128 tiqn->logout_stats.normal_logouts++;
2130 tiqn->logout_stats.abnormal_logouts++;
2131 spin_unlock(&tiqn->logout_stats.lock);
2134 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2135 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2136 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2137 hdr->cid, conn->cid);
2139 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2140 pr_err("Received logout request on connection that"
2141 " is not in logged in state, ignoring request.\n");
2145 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2147 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2150 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2151 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2152 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2153 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2154 cmd->targ_xfer_tag = 0xFFFFFFFF;
2155 cmd->cmd_sn = hdr->cmdsn;
2156 cmd->exp_stat_sn = hdr->exp_statsn;
2157 cmd->logout_cid = hdr->cid;
2158 cmd->logout_reason = reason_code;
2159 cmd->data_direction = DMA_NONE;
2162 * We need to sleep in these cases (by returning 1) until the Logout
2163 * Response gets sent in the tx thread.
2165 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2166 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2167 (hdr->cid == conn->cid)))
2170 spin_lock_bh(&conn->cmd_lock);
2171 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2172 spin_unlock_bh(&conn->cmd_lock);
2174 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2175 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2178 * Immediate commands are executed, well, immediately.
2179 * Non-Immediate Logout Commands are executed in CmdSN order.
2181 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2182 int ret = iscsit_execute_cmd(cmd, 0);
2187 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2188 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2190 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2191 return iscsit_add_reject_from_cmd(
2192 ISCSI_REASON_PROTOCOL_ERROR,
2197 return logout_remove;
2200 static int iscsit_handle_snack(
2201 struct iscsi_conn *conn,
2204 struct iscsi_snack *hdr;
2206 hdr = (struct iscsi_snack *) buf;
2207 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2208 hdr->itt = be32_to_cpu(hdr->itt);
2209 hdr->ttt = be32_to_cpu(hdr->ttt);
2210 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2211 hdr->begrun = be32_to_cpu(hdr->begrun);
2212 hdr->runlength = be32_to_cpu(hdr->runlength);
2214 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2215 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2216 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2217 hdr->begrun, hdr->runlength, conn->cid);
2219 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2220 pr_err("Initiator sent SNACK request while in"
2221 " ErrorRecoveryLevel=0.\n");
2222 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2226 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2227 * call from inside iscsi_send_recovery_datain_or_r2t().
2229 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2231 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2232 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2233 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2234 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2235 hdr->begrun, hdr->runlength);
2236 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2237 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2239 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2240 /* FIXME: Support R-Data SNACK */
2241 pr_err("R-Data SNACK Not Supported.\n");
2242 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2245 pr_err("Unknown SNACK type 0x%02x, protocol"
2246 " error.\n", hdr->flags & 0x0f);
2247 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2254 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2256 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2257 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2258 wait_for_completion_interruptible_timeout(
2259 &conn->rx_half_close_comp,
2260 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2264 static int iscsit_handle_immediate_data(
2265 struct iscsi_cmd *cmd,
2269 int iov_ret, rx_got = 0, rx_size = 0;
2270 u32 checksum, iov_count = 0, padding = 0;
2271 struct iscsi_conn *conn = cmd->conn;
2274 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2276 return IMMEDIATE_DATA_CANNOT_RECOVER;
2279 iov_count = iov_ret;
2280 iov = &cmd->iov_data[0];
2282 padding = ((-length) & 3);
2284 iov[iov_count].iov_base = cmd->pad_bytes;
2285 iov[iov_count++].iov_len = padding;
2289 if (conn->conn_ops->DataDigest) {
2290 iov[iov_count].iov_base = &checksum;
2291 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2292 rx_size += ISCSI_CRC_LEN;
2295 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2297 iscsit_unmap_iovec(cmd);
2299 if (rx_got != rx_size) {
2300 iscsit_rx_thread_wait_for_tcp(conn);
2301 return IMMEDIATE_DATA_CANNOT_RECOVER;
2304 if (conn->conn_ops->DataDigest) {
2307 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2308 cmd->write_data_done, length, padding,
2311 if (checksum != data_crc) {
2312 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2313 " does not match computed 0x%08x\n", checksum,
2316 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2317 pr_err("Unable to recover from"
2318 " Immediate Data digest failure while"
2320 iscsit_add_reject_from_cmd(
2321 ISCSI_REASON_DATA_DIGEST_ERROR,
2323 return IMMEDIATE_DATA_CANNOT_RECOVER;
2325 iscsit_add_reject_from_cmd(
2326 ISCSI_REASON_DATA_DIGEST_ERROR,
2328 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2331 pr_debug("Got CRC32C DataDigest 0x%08x for"
2332 " %u bytes of Immediate Data\n", checksum,
2337 cmd->write_data_done += length;
2339 if (cmd->write_data_done == cmd->data_length) {
2340 spin_lock_bh(&cmd->istate_lock);
2341 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2342 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2343 spin_unlock_bh(&cmd->istate_lock);
2346 return IMMEDIATE_DATA_NORMAL_OPERATION;
2350 * Called with sess->conn_lock held.
2352 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2353 with active network interface */
2354 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2356 struct iscsi_cmd *cmd;
2357 struct iscsi_conn *conn_p;
2360 * Only send a Asynchronous Message on connections whos network
2361 * interface is still functional.
2363 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2364 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2365 iscsit_inc_conn_usage_count(conn_p);
2373 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2375 iscsit_dec_conn_usage_count(conn_p);
2379 cmd->logout_cid = conn->cid;
2380 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2381 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2383 spin_lock_bh(&conn_p->cmd_lock);
2384 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2385 spin_unlock_bh(&conn_p->cmd_lock);
2387 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2388 iscsit_dec_conn_usage_count(conn_p);
2391 static int iscsit_send_conn_drop_async_message(
2392 struct iscsi_cmd *cmd,
2393 struct iscsi_conn *conn)
2395 struct iscsi_async *hdr;
2397 cmd->tx_size = ISCSI_HDR_LEN;
2398 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2400 hdr = (struct iscsi_async *) cmd->pdu;
2401 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2402 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2403 cmd->init_task_tag = 0xFFFFFFFF;
2404 cmd->targ_xfer_tag = 0xFFFFFFFF;
2405 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2406 cmd->stat_sn = conn->stat_sn++;
2407 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2408 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2409 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2410 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2411 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2412 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2413 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2415 if (conn->conn_ops->HeaderDigest) {
2416 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2418 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2419 (unsigned char *)hdr, ISCSI_HDR_LEN,
2420 0, NULL, (u8 *)header_digest);
2422 cmd->tx_size += ISCSI_CRC_LEN;
2423 pr_debug("Attaching CRC32C HeaderDigest to"
2424 " Async Message 0x%08x\n", *header_digest);
2427 cmd->iov_misc[0].iov_base = cmd->pdu;
2428 cmd->iov_misc[0].iov_len = cmd->tx_size;
2429 cmd->iov_misc_count = 1;
2431 pr_debug("Sending Connection Dropped Async Message StatSN:"
2432 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2433 cmd->logout_cid, conn->cid);
2437 static int iscsit_send_data_in(
2438 struct iscsi_cmd *cmd,
2439 struct iscsi_conn *conn,
2442 int iov_ret = 0, set_statsn = 0;
2443 u32 iov_count = 0, tx_size = 0;
2444 struct iscsi_datain datain;
2445 struct iscsi_datain_req *dr;
2446 struct iscsi_data_rsp *hdr;
2449 memset(&datain, 0, sizeof(struct iscsi_datain));
2450 dr = iscsit_get_datain_values(cmd, &datain);
2452 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2453 cmd->init_task_tag);
2458 * Be paranoid and double check the logic for now.
2460 if ((datain.offset + datain.length) > cmd->data_length) {
2461 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2462 " datain.length: %u exceeds cmd->data_length: %u\n",
2463 cmd->init_task_tag, datain.offset, datain.length,
2468 spin_lock_bh(&conn->sess->session_stats_lock);
2469 conn->sess->tx_data_octets += datain.length;
2470 if (conn->sess->se_sess->se_node_acl) {
2471 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2472 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2473 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2475 spin_unlock_bh(&conn->sess->session_stats_lock);
2477 * Special case for successfully execution w/ both DATAIN
2480 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2481 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2482 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2484 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2485 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2486 iscsit_increment_maxcmdsn(cmd, conn->sess);
2487 cmd->stat_sn = conn->stat_sn++;
2489 } else if (dr->dr_complete ==
2490 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2494 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2495 memset(hdr, 0, ISCSI_HDR_LEN);
2496 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2497 hdr->flags = datain.flags;
2498 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2499 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2500 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2501 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2502 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2503 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2504 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2507 hton24(hdr->dlength, datain.length);
2508 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2509 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2510 (struct scsi_lun *)&hdr->lun);
2512 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2514 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2515 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2516 cpu_to_be32(cmd->targ_xfer_tag) :
2518 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2520 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2521 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2522 hdr->datasn = cpu_to_be32(datain.data_sn);
2523 hdr->offset = cpu_to_be32(datain.offset);
2525 iov = &cmd->iov_data[0];
2526 iov[iov_count].iov_base = cmd->pdu;
2527 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2528 tx_size += ISCSI_HDR_LEN;
2530 if (conn->conn_ops->HeaderDigest) {
2531 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2533 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2534 (unsigned char *)hdr, ISCSI_HDR_LEN,
2535 0, NULL, (u8 *)header_digest);
2537 iov[0].iov_len += ISCSI_CRC_LEN;
2538 tx_size += ISCSI_CRC_LEN;
2540 pr_debug("Attaching CRC32 HeaderDigest"
2541 " for DataIN PDU 0x%08x\n", *header_digest);
2544 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2548 iov_count += iov_ret;
2549 tx_size += datain.length;
2551 cmd->padding = ((-datain.length) & 3);
2553 iov[iov_count].iov_base = cmd->pad_bytes;
2554 iov[iov_count++].iov_len = cmd->padding;
2555 tx_size += cmd->padding;
2557 pr_debug("Attaching %u padding bytes\n",
2560 if (conn->conn_ops->DataDigest) {
2561 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2562 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2564 iov[iov_count].iov_base = &cmd->data_crc;
2565 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2566 tx_size += ISCSI_CRC_LEN;
2568 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2569 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2572 cmd->iov_data_count = iov_count;
2573 cmd->tx_size = tx_size;
2575 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2576 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2577 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2578 ntohl(hdr->offset), datain.length, conn->cid);
2580 if (dr->dr_complete) {
2581 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2583 iscsit_free_datain_req(cmd, dr);
2589 static int iscsit_send_logout_response(
2590 struct iscsi_cmd *cmd,
2591 struct iscsi_conn *conn)
2593 int niov = 0, tx_size;
2594 struct iscsi_conn *logout_conn = NULL;
2595 struct iscsi_conn_recovery *cr = NULL;
2596 struct iscsi_session *sess = conn->sess;
2598 struct iscsi_logout_rsp *hdr;
2600 * The actual shutting down of Sessions and/or Connections
2601 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2602 * is done in scsi_logout_post_handler().
2604 switch (cmd->logout_reason) {
2605 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2606 pr_debug("iSCSI session logout successful, setting"
2607 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2608 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2610 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2611 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2614 * For CLOSECONNECTION logout requests carrying
2615 * a matching logout CID -> local CID, the reference
2616 * for the local CID will have been incremented in
2617 * iscsi_logout_closeconnection().
2619 * For CLOSECONNECTION logout requests carrying
2620 * a different CID than the connection it arrived
2621 * on, the connection responding to cmd->logout_cid
2622 * is stopped in iscsit_logout_post_handler_diffcid().
2625 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2626 " successful.\n", cmd->logout_cid, conn->cid);
2627 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2629 case ISCSI_LOGOUT_REASON_RECOVERY:
2630 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2631 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2634 * If the connection is still active from our point of view
2635 * force connection recovery to occur.
2637 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2639 if ((logout_conn)) {
2640 iscsit_connection_reinstatement_rcfr(logout_conn);
2641 iscsit_dec_conn_usage_count(logout_conn);
2644 cr = iscsit_get_inactive_connection_recovery_entry(
2645 conn->sess, cmd->logout_cid);
2647 pr_err("Unable to locate CID: %hu for"
2648 " REMOVECONNFORRECOVERY Logout Request.\n",
2650 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2654 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2656 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2657 " for recovery for CID: %hu on CID: %hu successful.\n",
2658 cmd->logout_cid, conn->cid);
2659 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2662 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2663 cmd->logout_reason);
2667 tx_size = ISCSI_HDR_LEN;
2668 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2669 memset(hdr, 0, ISCSI_HDR_LEN);
2670 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2671 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2672 hdr->response = cmd->logout_response;
2673 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2674 cmd->stat_sn = conn->stat_sn++;
2675 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2677 iscsit_increment_maxcmdsn(cmd, conn->sess);
2678 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2679 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2681 iov = &cmd->iov_misc[0];
2682 iov[niov].iov_base = cmd->pdu;
2683 iov[niov++].iov_len = ISCSI_HDR_LEN;
2685 if (conn->conn_ops->HeaderDigest) {
2686 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2688 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2689 (unsigned char *)hdr, ISCSI_HDR_LEN,
2690 0, NULL, (u8 *)header_digest);
2692 iov[0].iov_len += ISCSI_CRC_LEN;
2693 tx_size += ISCSI_CRC_LEN;
2694 pr_debug("Attaching CRC32C HeaderDigest to"
2695 " Logout Response 0x%08x\n", *header_digest);
2697 cmd->iov_misc_count = niov;
2698 cmd->tx_size = tx_size;
2700 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2701 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2702 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2703 cmd->logout_cid, conn->cid);
2709 * Unsolicited NOPIN, either requesting a response or not.
2711 static int iscsit_send_unsolicited_nopin(
2712 struct iscsi_cmd *cmd,
2713 struct iscsi_conn *conn,
2716 int tx_size = ISCSI_HDR_LEN;
2717 struct iscsi_nopin *hdr;
2719 hdr = (struct iscsi_nopin *) cmd->pdu;
2720 memset(hdr, 0, ISCSI_HDR_LEN);
2721 hdr->opcode = ISCSI_OP_NOOP_IN;
2722 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2723 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2724 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2725 cmd->stat_sn = conn->stat_sn;
2726 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2727 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2728 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2730 if (conn->conn_ops->HeaderDigest) {
2731 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2733 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2734 (unsigned char *)hdr, ISCSI_HDR_LEN,
2735 0, NULL, (u8 *)header_digest);
2737 tx_size += ISCSI_CRC_LEN;
2738 pr_debug("Attaching CRC32C HeaderDigest to"
2739 " NopIN 0x%08x\n", *header_digest);
2742 cmd->iov_misc[0].iov_base = cmd->pdu;
2743 cmd->iov_misc[0].iov_len = tx_size;
2744 cmd->iov_misc_count = 1;
2745 cmd->tx_size = tx_size;
2747 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2748 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2753 static int iscsit_send_nopin_response(
2754 struct iscsi_cmd *cmd,
2755 struct iscsi_conn *conn)
2757 int niov = 0, tx_size;
2760 struct iscsi_nopin *hdr;
2762 tx_size = ISCSI_HDR_LEN;
2763 hdr = (struct iscsi_nopin *) cmd->pdu;
2764 memset(hdr, 0, ISCSI_HDR_LEN);
2765 hdr->opcode = ISCSI_OP_NOOP_IN;
2766 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2767 hton24(hdr->dlength, cmd->buf_ptr_size);
2768 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2769 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2770 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2771 cmd->stat_sn = conn->stat_sn++;
2772 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2774 iscsit_increment_maxcmdsn(cmd, conn->sess);
2775 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2776 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2778 iov = &cmd->iov_misc[0];
2779 iov[niov].iov_base = cmd->pdu;
2780 iov[niov++].iov_len = ISCSI_HDR_LEN;
2782 if (conn->conn_ops->HeaderDigest) {
2783 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2785 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2786 (unsigned char *)hdr, ISCSI_HDR_LEN,
2787 0, NULL, (u8 *)header_digest);
2789 iov[0].iov_len += ISCSI_CRC_LEN;
2790 tx_size += ISCSI_CRC_LEN;
2791 pr_debug("Attaching CRC32C HeaderDigest"
2792 " to NopIn 0x%08x\n", *header_digest);
2796 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2797 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2799 if (cmd->buf_ptr_size) {
2800 iov[niov].iov_base = cmd->buf_ptr;
2801 iov[niov++].iov_len = cmd->buf_ptr_size;
2802 tx_size += cmd->buf_ptr_size;
2804 pr_debug("Echoing back %u bytes of ping"
2805 " data.\n", cmd->buf_ptr_size);
2807 padding = ((-cmd->buf_ptr_size) & 3);
2809 iov[niov].iov_base = &cmd->pad_bytes;
2810 iov[niov++].iov_len = padding;
2812 pr_debug("Attaching %u additional"
2813 " padding bytes.\n", padding);
2815 if (conn->conn_ops->DataDigest) {
2816 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2817 cmd->buf_ptr, cmd->buf_ptr_size,
2818 padding, (u8 *)&cmd->pad_bytes,
2819 (u8 *)&cmd->data_crc);
2821 iov[niov].iov_base = &cmd->data_crc;
2822 iov[niov++].iov_len = ISCSI_CRC_LEN;
2823 tx_size += ISCSI_CRC_LEN;
2824 pr_debug("Attached DataDigest for %u"
2825 " bytes of ping data, CRC 0x%08x\n",
2826 cmd->buf_ptr_size, cmd->data_crc);
2830 cmd->iov_misc_count = niov;
2831 cmd->tx_size = tx_size;
2833 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2834 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2835 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2840 int iscsit_send_r2t(
2841 struct iscsi_cmd *cmd,
2842 struct iscsi_conn *conn)
2845 struct iscsi_r2t *r2t;
2846 struct iscsi_r2t_rsp *hdr;
2848 r2t = iscsit_get_r2t_from_list(cmd);
2852 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2853 memset(hdr, 0, ISCSI_HDR_LEN);
2854 hdr->opcode = ISCSI_OP_R2T;
2855 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2856 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2857 (struct scsi_lun *)&hdr->lun);
2858 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2859 spin_lock_bh(&conn->sess->ttt_lock);
2860 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2861 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2862 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2863 spin_unlock_bh(&conn->sess->ttt_lock);
2864 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2865 hdr->statsn = cpu_to_be32(conn->stat_sn);
2866 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2867 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2868 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2869 hdr->data_offset = cpu_to_be32(r2t->offset);
2870 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2872 cmd->iov_misc[0].iov_base = cmd->pdu;
2873 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2874 tx_size += ISCSI_HDR_LEN;
2876 if (conn->conn_ops->HeaderDigest) {
2877 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2879 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2880 (unsigned char *)hdr, ISCSI_HDR_LEN,
2881 0, NULL, (u8 *)header_digest);
2883 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2884 tx_size += ISCSI_CRC_LEN;
2885 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2886 " PDU 0x%08x\n", *header_digest);
2889 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2890 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2891 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2892 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2893 r2t->offset, r2t->xfer_len, conn->cid);
2895 cmd->iov_misc_count = 1;
2896 cmd->tx_size = tx_size;
2898 spin_lock_bh(&cmd->r2t_lock);
2900 spin_unlock_bh(&cmd->r2t_lock);
2906 * type 0: Normal Operation.
2907 * type 1: Called from Storage Transport.
2908 * type 2: Called from iscsi_task_reassign_complete_write() for
2909 * connection recovery.
2911 int iscsit_build_r2ts_for_cmd(
2912 struct iscsi_cmd *cmd,
2913 struct iscsi_conn *conn,
2917 u32 offset = 0, xfer_len = 0;
2919 spin_lock_bh(&cmd->r2t_lock);
2920 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2921 spin_unlock_bh(&cmd->r2t_lock);
2925 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2926 if (cmd->r2t_offset < cmd->write_data_done)
2927 cmd->r2t_offset = cmd->write_data_done;
2929 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2930 if (conn->sess->sess_ops->DataSequenceInOrder) {
2931 offset = cmd->r2t_offset;
2933 if (first_r2t && (type == 2)) {
2934 xfer_len = ((offset +
2935 (conn->sess->sess_ops->MaxBurstLength -
2936 cmd->next_burst_len) >
2938 (cmd->data_length - offset) :
2939 (conn->sess->sess_ops->MaxBurstLength -
2940 cmd->next_burst_len));
2942 xfer_len = ((offset +
2943 conn->sess->sess_ops->MaxBurstLength) >
2945 (cmd->data_length - offset) :
2946 conn->sess->sess_ops->MaxBurstLength;
2948 cmd->r2t_offset += xfer_len;
2950 if (cmd->r2t_offset == cmd->data_length)
2951 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2953 struct iscsi_seq *seq;
2955 seq = iscsit_get_seq_holder_for_r2t(cmd);
2957 spin_unlock_bh(&cmd->r2t_lock);
2961 offset = seq->offset;
2962 xfer_len = seq->xfer_len;
2964 if (cmd->seq_send_order == cmd->seq_count)
2965 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2967 cmd->outstanding_r2ts++;
2970 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2971 spin_unlock_bh(&cmd->r2t_lock);
2975 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2978 spin_unlock_bh(&cmd->r2t_lock);
2983 static int iscsit_send_status(
2984 struct iscsi_cmd *cmd,
2985 struct iscsi_conn *conn)
2987 u8 iov_count = 0, recovery;
2988 u32 padding = 0, tx_size = 0;
2989 struct iscsi_scsi_rsp *hdr;
2992 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
2994 cmd->stat_sn = conn->stat_sn++;
2996 spin_lock_bh(&conn->sess->session_stats_lock);
2997 conn->sess->rsp_pdus++;
2998 spin_unlock_bh(&conn->sess->session_stats_lock);
3000 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3001 memset(hdr, 0, ISCSI_HDR_LEN);
3002 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3003 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3004 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3005 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3006 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3007 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3008 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3009 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3011 hdr->response = cmd->iscsi_response;
3012 hdr->cmd_status = cmd->se_cmd.scsi_status;
3013 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3014 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3016 iscsit_increment_maxcmdsn(cmd, conn->sess);
3017 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3018 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3020 iov = &cmd->iov_misc[0];
3021 iov[iov_count].iov_base = cmd->pdu;
3022 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3023 tx_size += ISCSI_HDR_LEN;
3026 * Attach SENSE DATA payload to iSCSI Response PDU
3028 if (cmd->se_cmd.sense_buffer &&
3029 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3030 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3031 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3032 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3033 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3034 iov[iov_count++].iov_len =
3035 (cmd->se_cmd.scsi_sense_length + padding);
3036 tx_size += cmd->se_cmd.scsi_sense_length;
3039 memset(cmd->se_cmd.sense_buffer +
3040 cmd->se_cmd.scsi_sense_length, 0, padding);
3042 pr_debug("Adding %u bytes of padding to"
3043 " SENSE.\n", padding);
3046 if (conn->conn_ops->DataDigest) {
3047 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3048 cmd->se_cmd.sense_buffer,
3049 (cmd->se_cmd.scsi_sense_length + padding),
3050 0, NULL, (u8 *)&cmd->data_crc);
3052 iov[iov_count].iov_base = &cmd->data_crc;
3053 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3054 tx_size += ISCSI_CRC_LEN;
3056 pr_debug("Attaching CRC32 DataDigest for"
3057 " SENSE, %u bytes CRC 0x%08x\n",
3058 (cmd->se_cmd.scsi_sense_length + padding),
3062 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3064 cmd->se_cmd.scsi_sense_length);
3067 if (conn->conn_ops->HeaderDigest) {
3068 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3070 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3071 (unsigned char *)hdr, ISCSI_HDR_LEN,
3072 0, NULL, (u8 *)header_digest);
3074 iov[0].iov_len += ISCSI_CRC_LEN;
3075 tx_size += ISCSI_CRC_LEN;
3076 pr_debug("Attaching CRC32 HeaderDigest for Response"
3077 " PDU 0x%08x\n", *header_digest);
3080 cmd->iov_misc_count = iov_count;
3081 cmd->tx_size = tx_size;
3083 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3084 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3085 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3086 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3091 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3093 switch (se_tmr->response) {
3094 case TMR_FUNCTION_COMPLETE:
3095 return ISCSI_TMF_RSP_COMPLETE;
3096 case TMR_TASK_DOES_NOT_EXIST:
3097 return ISCSI_TMF_RSP_NO_TASK;
3098 case TMR_LUN_DOES_NOT_EXIST:
3099 return ISCSI_TMF_RSP_NO_LUN;
3100 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3101 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3102 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3103 return ISCSI_TMF_RSP_AUTH_FAILED;
3104 case TMR_FUNCTION_REJECTED:
3106 return ISCSI_TMF_RSP_REJECTED;
3110 static int iscsit_send_task_mgt_rsp(
3111 struct iscsi_cmd *cmd,
3112 struct iscsi_conn *conn)
3114 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3115 struct iscsi_tm_rsp *hdr;
3118 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3119 memset(hdr, 0, ISCSI_HDR_LEN);
3120 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3121 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3122 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3123 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3124 cmd->stat_sn = conn->stat_sn++;
3125 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3127 iscsit_increment_maxcmdsn(cmd, conn->sess);
3128 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3129 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3131 cmd->iov_misc[0].iov_base = cmd->pdu;
3132 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3133 tx_size += ISCSI_HDR_LEN;
3135 if (conn->conn_ops->HeaderDigest) {
3136 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3138 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3139 (unsigned char *)hdr, ISCSI_HDR_LEN,
3140 0, NULL, (u8 *)header_digest);
3142 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3143 tx_size += ISCSI_CRC_LEN;
3144 pr_debug("Attaching CRC32 HeaderDigest for Task"
3145 " Mgmt Response PDU 0x%08x\n", *header_digest);
3148 cmd->iov_misc_count = 1;
3149 cmd->tx_size = tx_size;
3151 pr_debug("Built Task Management Response ITT: 0x%08x,"
3152 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3153 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3158 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3162 if (np->np_sockaddr.ss_family == AF_INET6) {
3163 const struct sockaddr_in6 sin6 = {
3164 .sin6_addr = IN6ADDR_ANY_INIT };
3165 struct sockaddr_in6 *sock_in6 =
3166 (struct sockaddr_in6 *)&np->np_sockaddr;
3168 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3169 sin6.sin6_addr.s6_addr, 16))
3172 struct sockaddr_in * sock_in =
3173 (struct sockaddr_in *)&np->np_sockaddr;
3175 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3182 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3184 char *payload = NULL;
3185 struct iscsi_conn *conn = cmd->conn;
3186 struct iscsi_portal_group *tpg;
3187 struct iscsi_tiqn *tiqn;
3188 struct iscsi_tpg_np *tpg_np;
3189 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3190 unsigned char buf[256];
3192 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3193 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3195 memset(buf, 0, 256);
3197 payload = kzalloc(buffer_len, GFP_KERNEL);
3199 pr_err("Unable to allocate memory for sendtargets"
3204 spin_lock(&tiqn_lock);
3205 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3206 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3209 if ((len + payload_len) > buffer_len) {
3210 spin_unlock(&tiqn->tiqn_tpg_lock);
3214 memcpy(payload + payload_len, buf, len);
3217 spin_lock(&tiqn->tiqn_tpg_lock);
3218 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3220 spin_lock(&tpg->tpg_state_lock);
3221 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3222 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3223 spin_unlock(&tpg->tpg_state_lock);
3226 spin_unlock(&tpg->tpg_state_lock);
3228 spin_lock(&tpg->tpg_np_lock);
3229 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3231 struct iscsi_np *np = tpg_np->tpg_np;
3232 bool inaddr_any = iscsit_check_inaddr_any(np);
3234 len = sprintf(buf, "TargetAddress="
3236 (np->np_sockaddr.ss_family == AF_INET6) ?
3237 "[" : "", (inaddr_any == false) ?
3238 np->np_ip : conn->local_ip,
3239 (np->np_sockaddr.ss_family == AF_INET6) ?
3240 "]" : "", (inaddr_any == false) ?
3241 np->np_port : conn->local_port,
3245 if ((len + payload_len) > buffer_len) {
3246 spin_unlock(&tpg->tpg_np_lock);
3247 spin_unlock(&tiqn->tiqn_tpg_lock);
3251 memcpy(payload + payload_len, buf, len);
3254 spin_unlock(&tpg->tpg_np_lock);
3256 spin_unlock(&tiqn->tiqn_tpg_lock);
3261 spin_unlock(&tiqn_lock);
3263 cmd->buf_ptr = payload;
3269 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3270 * MaxRecvDataSegmentLength.
3272 static int iscsit_send_text_rsp(
3273 struct iscsi_cmd *cmd,
3274 struct iscsi_conn *conn)
3276 struct iscsi_text_rsp *hdr;
3278 u32 padding = 0, tx_size = 0;
3279 int text_length, iov_count = 0;
3281 text_length = iscsit_build_sendtargets_response(cmd);
3282 if (text_length < 0)
3285 padding = ((-text_length) & 3);
3287 memset(cmd->buf_ptr + text_length, 0, padding);
3288 pr_debug("Attaching %u additional bytes for"
3289 " padding.\n", padding);
3292 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3293 memset(hdr, 0, ISCSI_HDR_LEN);
3294 hdr->opcode = ISCSI_OP_TEXT_RSP;
3295 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3296 hton24(hdr->dlength, text_length);
3297 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3298 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3299 cmd->stat_sn = conn->stat_sn++;
3300 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3302 iscsit_increment_maxcmdsn(cmd, conn->sess);
3303 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3304 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3306 iov = &cmd->iov_misc[0];
3308 iov[iov_count].iov_base = cmd->pdu;
3309 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3310 iov[iov_count].iov_base = cmd->buf_ptr;
3311 iov[iov_count++].iov_len = text_length + padding;
3313 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3315 if (conn->conn_ops->HeaderDigest) {
3316 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3318 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3319 (unsigned char *)hdr, ISCSI_HDR_LEN,
3320 0, NULL, (u8 *)header_digest);
3322 iov[0].iov_len += ISCSI_CRC_LEN;
3323 tx_size += ISCSI_CRC_LEN;
3324 pr_debug("Attaching CRC32 HeaderDigest for"
3325 " Text Response PDU 0x%08x\n", *header_digest);
3328 if (conn->conn_ops->DataDigest) {
3329 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3330 cmd->buf_ptr, (text_length + padding),
3331 0, NULL, (u8 *)&cmd->data_crc);
3333 iov[iov_count].iov_base = &cmd->data_crc;
3334 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3335 tx_size += ISCSI_CRC_LEN;
3337 pr_debug("Attaching DataDigest for %u bytes of text"
3338 " data, CRC 0x%08x\n", (text_length + padding),
3342 cmd->iov_misc_count = iov_count;
3343 cmd->tx_size = tx_size;
3345 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3346 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3347 text_length, conn->cid);
3351 static int iscsit_send_reject(
3352 struct iscsi_cmd *cmd,
3353 struct iscsi_conn *conn)
3355 u32 iov_count = 0, tx_size = 0;
3356 struct iscsi_reject *hdr;
3359 hdr = (struct iscsi_reject *) cmd->pdu;
3360 hdr->opcode = ISCSI_OP_REJECT;
3361 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3362 hton24(hdr->dlength, ISCSI_HDR_LEN);
3363 cmd->stat_sn = conn->stat_sn++;
3364 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3365 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3366 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3368 iov = &cmd->iov_misc[0];
3370 iov[iov_count].iov_base = cmd->pdu;
3371 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3372 iov[iov_count].iov_base = cmd->buf_ptr;
3373 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3375 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3377 if (conn->conn_ops->HeaderDigest) {
3378 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3380 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3381 (unsigned char *)hdr, ISCSI_HDR_LEN,
3382 0, NULL, (u8 *)header_digest);
3384 iov[0].iov_len += ISCSI_CRC_LEN;
3385 tx_size += ISCSI_CRC_LEN;
3386 pr_debug("Attaching CRC32 HeaderDigest for"
3387 " REJECT PDU 0x%08x\n", *header_digest);
3390 if (conn->conn_ops->DataDigest) {
3391 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3392 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3393 0, NULL, (u8 *)&cmd->data_crc);
3395 iov[iov_count].iov_base = &cmd->data_crc;
3396 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3397 tx_size += ISCSI_CRC_LEN;
3398 pr_debug("Attaching CRC32 DataDigest for REJECT"
3399 " PDU 0x%08x\n", cmd->data_crc);
3402 cmd->iov_misc_count = iov_count;
3403 cmd->tx_size = tx_size;
3405 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3406 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3411 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3413 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3414 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3415 wait_for_completion_interruptible_timeout(
3416 &conn->tx_half_close_comp,
3417 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3423 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3425 struct iscsi_thread_set *ts = conn->thread_set;
3428 * thread_id is assigned from iscsit_global->ts_bitmap from
3429 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3431 * Here we use thread_id to determine which CPU that this
3432 * iSCSI connection's iscsi_thread_set will be scheduled to
3435 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3437 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3438 " thread_id: %d\n", ord, ts->thread_id);
3440 for_each_online_cpu(cpu) {
3442 cpumask_set_cpu(cpu, conn->conn_cpumask);
3447 * This should never be reached..
3450 cpumask_setall(conn->conn_cpumask);
3453 static inline void iscsit_thread_check_cpumask(
3454 struct iscsi_conn *conn,
3455 struct task_struct *p,
3460 * mode == 1 signals iscsi_target_tx_thread() usage.
3461 * mode == 0 signals iscsi_target_rx_thread() usage.
3464 if (!conn->conn_tx_reset_cpumask)
3466 conn->conn_tx_reset_cpumask = 0;
3468 if (!conn->conn_rx_reset_cpumask)
3470 conn->conn_rx_reset_cpumask = 0;
3473 * Update the CPU mask for this single kthread so that
3474 * both TX and RX kthreads are scheduled to run on the
3477 memset(buf, 0, 128);
3478 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3480 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3481 " %s for %s\n", buf, p->comm);
3483 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3488 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3493 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3494 #endif /* CONFIG_SMP */
3496 int iscsi_target_tx_thread(void *arg)
3501 int sent_status = 0;
3504 struct iscsi_cmd *cmd = NULL;
3505 struct iscsi_conn *conn;
3506 struct iscsi_queue_req *qr = NULL;
3507 struct iscsi_thread_set *ts = arg;
3509 * Allow ourselves to be interrupted by SIGINT so that a
3510 * connection recovery / failure event can be triggered externally.
3512 allow_signal(SIGINT);
3515 conn = iscsi_tx_thread_pre_handler(ts);
3519 eodr = map_sg = ret = sent_status = use_misc = 0;
3521 while (!kthread_should_stop()) {
3523 * Ensure that both TX and RX per connection kthreads
3524 * are scheduled to run on the same CPU.
3526 iscsit_thread_check_cpumask(conn, current, 1);
3528 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3530 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3531 signal_pending(current))
3535 qr = iscsit_get_cmd_from_immediate_queue(conn);
3537 atomic_set(&conn->check_immediate_queue, 0);
3540 kmem_cache_free(lio_qr_cache, qr);
3542 spin_lock_bh(&cmd->istate_lock);
3544 case ISTATE_SEND_R2T:
3545 spin_unlock_bh(&cmd->istate_lock);
3546 ret = iscsit_send_r2t(cmd, conn);
3549 spin_unlock_bh(&cmd->istate_lock);
3551 if (cmd->data_direction == DMA_TO_DEVICE)
3552 iscsit_stop_dataout_timer(cmd);
3554 spin_lock_bh(&conn->cmd_lock);
3555 list_del(&cmd->i_list);
3556 spin_unlock_bh(&conn->cmd_lock);
3558 iscsit_free_cmd(cmd);
3560 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3561 spin_unlock_bh(&cmd->istate_lock);
3562 iscsit_mod_nopin_response_timer(conn);
3563 ret = iscsit_send_unsolicited_nopin(cmd,
3566 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3567 spin_unlock_bh(&cmd->istate_lock);
3568 ret = iscsit_send_unsolicited_nopin(cmd,
3572 pr_err("Unknown Opcode: 0x%02x ITT:"
3573 " 0x%08x, i_state: %d on CID: %hu\n",
3574 cmd->iscsi_opcode, cmd->init_task_tag, state,
3576 spin_unlock_bh(&cmd->istate_lock);
3580 conn->tx_immediate_queue = 0;
3584 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3585 conn->tx_immediate_queue = 0;
3586 iscsit_tx_thread_wait_for_tcp(conn);
3590 spin_lock_bh(&cmd->istate_lock);
3592 case ISTATE_SEND_R2T:
3593 spin_unlock_bh(&cmd->istate_lock);
3594 spin_lock_bh(&cmd->dataout_timeout_lock);
3595 iscsit_start_dataout_timer(cmd, conn);
3596 spin_unlock_bh(&cmd->dataout_timeout_lock);
3598 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3599 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3600 spin_unlock_bh(&cmd->istate_lock);
3602 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3603 cmd->i_state = ISTATE_SENT_STATUS;
3604 spin_unlock_bh(&cmd->istate_lock);
3607 pr_err("Unknown Opcode: 0x%02x ITT:"
3608 " 0x%08x, i_state: %d on CID: %hu\n",
3609 cmd->iscsi_opcode, cmd->init_task_tag,
3611 spin_unlock_bh(&cmd->istate_lock);
3616 conn->tx_immediate_queue = 0;
3619 qr = iscsit_get_cmd_from_response_queue(conn);
3623 kmem_cache_free(lio_qr_cache, qr);
3625 spin_lock_bh(&cmd->istate_lock);
3628 case ISTATE_SEND_DATAIN:
3629 spin_unlock_bh(&cmd->istate_lock);
3630 ret = iscsit_send_data_in(cmd, conn,
3634 case ISTATE_SEND_STATUS:
3635 case ISTATE_SEND_STATUS_RECOVERY:
3636 spin_unlock_bh(&cmd->istate_lock);
3638 ret = iscsit_send_status(cmd, conn);
3640 case ISTATE_SEND_LOGOUTRSP:
3641 spin_unlock_bh(&cmd->istate_lock);
3643 ret = iscsit_send_logout_response(cmd, conn);
3645 case ISTATE_SEND_ASYNCMSG:
3646 spin_unlock_bh(&cmd->istate_lock);
3648 ret = iscsit_send_conn_drop_async_message(
3651 case ISTATE_SEND_NOPIN:
3652 spin_unlock_bh(&cmd->istate_lock);
3654 ret = iscsit_send_nopin_response(cmd, conn);
3656 case ISTATE_SEND_REJECT:
3657 spin_unlock_bh(&cmd->istate_lock);
3659 ret = iscsit_send_reject(cmd, conn);
3661 case ISTATE_SEND_TASKMGTRSP:
3662 spin_unlock_bh(&cmd->istate_lock);
3664 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3667 ret = iscsit_tmr_post_handler(cmd, conn);
3669 iscsit_fall_back_to_erl0(conn->sess);
3671 case ISTATE_SEND_TEXTRSP:
3672 spin_unlock_bh(&cmd->istate_lock);
3674 ret = iscsit_send_text_rsp(cmd, conn);
3677 pr_err("Unknown Opcode: 0x%02x ITT:"
3678 " 0x%08x, i_state: %d on CID: %hu\n",
3679 cmd->iscsi_opcode, cmd->init_task_tag,
3681 spin_unlock_bh(&cmd->istate_lock);
3685 conn->tx_response_queue = 0;
3689 if (map_sg && !conn->conn_ops->IFMarker) {
3690 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3691 conn->tx_response_queue = 0;
3692 iscsit_tx_thread_wait_for_tcp(conn);
3693 iscsit_unmap_iovec(cmd);
3697 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3698 conn->tx_response_queue = 0;
3699 iscsit_tx_thread_wait_for_tcp(conn);
3700 iscsit_unmap_iovec(cmd);
3705 iscsit_unmap_iovec(cmd);
3707 spin_lock_bh(&cmd->istate_lock);
3709 case ISTATE_SEND_DATAIN:
3711 goto check_rsp_state;
3714 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3716 eodr = use_misc = 0;
3717 } else if (eodr == 2) {
3718 cmd->i_state = state =
3721 eodr = use_misc = 0;
3722 goto check_rsp_state;
3725 case ISTATE_SEND_STATUS:
3729 case ISTATE_SEND_ASYNCMSG:
3730 case ISTATE_SEND_NOPIN:
3731 case ISTATE_SEND_STATUS_RECOVERY:
3732 case ISTATE_SEND_TEXTRSP:
3736 case ISTATE_SEND_REJECT:
3738 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3739 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3740 spin_unlock_bh(&cmd->istate_lock);
3741 complete(&cmd->reject_comp);
3744 complete(&cmd->reject_comp);
3746 case ISTATE_SEND_TASKMGTRSP:
3750 case ISTATE_SEND_LOGOUTRSP:
3751 spin_unlock_bh(&cmd->istate_lock);
3752 if (!iscsit_logout_post_handler(cmd, conn))
3754 spin_lock_bh(&cmd->istate_lock);
3759 pr_err("Unknown Opcode: 0x%02x ITT:"
3760 " 0x%08x, i_state: %d on CID: %hu\n",
3761 cmd->iscsi_opcode, cmd->init_task_tag,
3762 cmd->i_state, conn->cid);
3763 spin_unlock_bh(&cmd->istate_lock);
3768 cmd->i_state = ISTATE_SENT_STATUS;
3771 spin_unlock_bh(&cmd->istate_lock);
3773 if (atomic_read(&conn->check_immediate_queue))
3778 conn->tx_response_queue = 0;
3782 iscsit_take_action_for_connection_exit(conn);
3788 int iscsi_target_rx_thread(void *arg)
3791 u8 buffer[ISCSI_HDR_LEN], opcode;
3792 u32 checksum = 0, digest = 0;
3793 struct iscsi_conn *conn = NULL;
3794 struct iscsi_thread_set *ts = arg;
3797 * Allow ourselves to be interrupted by SIGINT so that a
3798 * connection recovery / failure event can be triggered externally.
3800 allow_signal(SIGINT);
3803 conn = iscsi_rx_thread_pre_handler(ts);
3807 while (!kthread_should_stop()) {
3809 * Ensure that both TX and RX per connection kthreads
3810 * are scheduled to run on the same CPU.
3812 iscsit_thread_check_cpumask(conn, current, 0);
3814 memset(buffer, 0, ISCSI_HDR_LEN);
3815 memset(&iov, 0, sizeof(struct kvec));
3817 iov.iov_base = buffer;
3818 iov.iov_len = ISCSI_HDR_LEN;
3820 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3821 if (ret != ISCSI_HDR_LEN) {
3822 iscsit_rx_thread_wait_for_tcp(conn);
3827 * Set conn->bad_hdr for use with REJECT PDUs.
3829 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3831 if (conn->conn_ops->HeaderDigest) {
3832 iov.iov_base = &digest;
3833 iov.iov_len = ISCSI_CRC_LEN;
3835 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3836 if (ret != ISCSI_CRC_LEN) {
3837 iscsit_rx_thread_wait_for_tcp(conn);
3841 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3842 buffer, ISCSI_HDR_LEN,
3843 0, NULL, (u8 *)&checksum);
3845 if (digest != checksum) {
3846 pr_err("HeaderDigest CRC32C failed,"
3847 " received 0x%08x, computed 0x%08x\n",
3850 * Set the PDU to 0xff so it will intentionally
3851 * hit default in the switch below.
3853 memset(buffer, 0xff, ISCSI_HDR_LEN);
3854 spin_lock_bh(&conn->sess->session_stats_lock);
3855 conn->sess->conn_digest_errors++;
3856 spin_unlock_bh(&conn->sess->session_stats_lock);
3858 pr_debug("Got HeaderDigest CRC32C"
3859 " 0x%08x\n", checksum);
3863 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3866 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3868 if (conn->sess->sess_ops->SessionType &&
3869 ((!(opcode & ISCSI_OP_TEXT)) ||
3870 (!(opcode & ISCSI_OP_LOGOUT)))) {
3871 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3872 " while in Discovery Session, rejecting.\n", opcode);
3873 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3879 case ISCSI_OP_SCSI_CMD:
3880 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3883 case ISCSI_OP_SCSI_DATA_OUT:
3884 if (iscsit_handle_data_out(conn, buffer) < 0)
3887 case ISCSI_OP_NOOP_OUT:
3888 if (iscsit_handle_nop_out(conn, buffer) < 0)
3891 case ISCSI_OP_SCSI_TMFUNC:
3892 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3896 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3899 case ISCSI_OP_LOGOUT:
3900 ret = iscsit_handle_logout_cmd(conn, buffer);
3902 wait_for_completion_timeout(&conn->conn_logout_comp,
3903 SECONDS_FOR_LOGOUT_COMP * HZ);
3908 case ISCSI_OP_SNACK:
3909 if (iscsit_handle_snack(conn, buffer) < 0)
3913 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3915 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3916 pr_err("Cannot recover from unknown"
3917 " opcode while ERL=0, closing iSCSI connection"
3921 if (!conn->conn_ops->OFMarker) {
3922 pr_err("Unable to recover from unknown"
3923 " opcode while OFMarker=No, closing iSCSI"
3927 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3928 pr_err("Unable to recover from unknown"
3929 " opcode, closing iSCSI connection.\n");
3937 if (!signal_pending(current))
3938 atomic_set(&conn->transport_failed, 1);
3939 iscsit_take_action_for_connection_exit(conn);
3945 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3947 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3948 struct iscsi_session *sess = conn->sess;
3950 * We expect this function to only ever be called from either RX or TX
3951 * thread context via iscsit_close_connection() once the other context
3952 * has been reset -> returned sleeping pre-handler state.
3954 spin_lock_bh(&conn->cmd_lock);
3955 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3957 list_del(&cmd->i_list);
3958 spin_unlock_bh(&conn->cmd_lock);
3960 iscsit_increment_maxcmdsn(cmd, sess);
3962 iscsit_free_cmd(cmd);
3964 spin_lock_bh(&conn->cmd_lock);
3966 spin_unlock_bh(&conn->cmd_lock);
3969 static void iscsit_stop_timers_for_cmds(
3970 struct iscsi_conn *conn)
3972 struct iscsi_cmd *cmd;
3974 spin_lock_bh(&conn->cmd_lock);
3975 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3976 if (cmd->data_direction == DMA_TO_DEVICE)
3977 iscsit_stop_dataout_timer(cmd);
3979 spin_unlock_bh(&conn->cmd_lock);
3982 int iscsit_close_connection(
3983 struct iscsi_conn *conn)
3985 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3986 struct iscsi_session *sess = conn->sess;
3988 pr_debug("Closing iSCSI connection CID %hu on SID:"
3989 " %u\n", conn->cid, sess->sid);
3991 * Always up conn_logout_comp just in case the RX Thread is sleeping
3992 * and the logout response never got sent because the connection
3995 complete(&conn->conn_logout_comp);
3997 iscsi_release_thread_set(conn);
3999 iscsit_stop_timers_for_cmds(conn);
4000 iscsit_stop_nopin_response_timer(conn);
4001 iscsit_stop_nopin_timer(conn);
4002 iscsit_free_queue_reqs_for_conn(conn);
4005 * During Connection recovery drop unacknowledged out of order
4006 * commands for this connection, and prepare the other commands
4009 * During normal operation clear the out of order commands (but
4010 * do not free the struct iscsi_ooo_cmdsn's) and release all
4011 * struct iscsi_cmds.
4013 if (atomic_read(&conn->connection_recovery)) {
4014 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4015 iscsit_prepare_cmds_for_realligance(conn);
4017 iscsit_clear_ooo_cmdsns_for_conn(conn);
4018 iscsit_release_commands_from_conn(conn);
4022 * Handle decrementing session or connection usage count if
4023 * a logout response was not able to be sent because the
4024 * connection failed. Fall back to Session Recovery here.
4026 if (atomic_read(&conn->conn_logout_remove)) {
4027 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4028 iscsit_dec_conn_usage_count(conn);
4029 iscsit_dec_session_usage_count(sess);
4031 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4032 iscsit_dec_conn_usage_count(conn);
4034 atomic_set(&conn->conn_logout_remove, 0);
4035 atomic_set(&sess->session_reinstatement, 0);
4036 atomic_set(&sess->session_fall_back_to_erl0, 1);
4039 spin_lock_bh(&sess->conn_lock);
4040 list_del(&conn->conn_list);
4043 * Attempt to let the Initiator know this connection failed by
4044 * sending an Connection Dropped Async Message on another
4045 * active connection.
4047 if (atomic_read(&conn->connection_recovery))
4048 iscsit_build_conn_drop_async_message(conn);
4050 spin_unlock_bh(&sess->conn_lock);
4053 * If connection reinstatement is being performed on this connection,
4054 * up the connection reinstatement semaphore that is being blocked on
4055 * in iscsit_cause_connection_reinstatement().
4057 spin_lock_bh(&conn->state_lock);
4058 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4059 spin_unlock_bh(&conn->state_lock);
4060 complete(&conn->conn_wait_comp);
4061 wait_for_completion(&conn->conn_post_wait_comp);
4062 spin_lock_bh(&conn->state_lock);
4066 * If connection reinstatement is being performed on this connection
4067 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4068 * connection wait rcfr semaphore that is being blocked on
4069 * an iscsit_connection_reinstatement_rcfr().
4071 if (atomic_read(&conn->connection_wait_rcfr)) {
4072 spin_unlock_bh(&conn->state_lock);
4073 complete(&conn->conn_wait_rcfr_comp);
4074 wait_for_completion(&conn->conn_post_wait_comp);
4075 spin_lock_bh(&conn->state_lock);
4077 atomic_set(&conn->connection_reinstatement, 1);
4078 spin_unlock_bh(&conn->state_lock);
4081 * If any other processes are accessing this connection pointer we
4082 * must wait until they have completed.
4084 iscsit_check_conn_usage_count(conn);
4086 if (conn->conn_rx_hash.tfm)
4087 crypto_free_hash(conn->conn_rx_hash.tfm);
4088 if (conn->conn_tx_hash.tfm)
4089 crypto_free_hash(conn->conn_tx_hash.tfm);
4091 if (conn->conn_cpumask)
4092 free_cpumask_var(conn->conn_cpumask);
4094 kfree(conn->conn_ops);
4095 conn->conn_ops = NULL;
4098 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4099 kfree(conn->sock->file);
4100 conn->sock->file = NULL;
4102 sock_release(conn->sock);
4104 conn->thread_set = NULL;
4106 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4107 conn->conn_state = TARG_CONN_STATE_FREE;
4110 spin_lock_bh(&sess->conn_lock);
4111 atomic_dec(&sess->nconn);
4112 pr_debug("Decremented iSCSI connection count to %hu from node:"
4113 " %s\n", atomic_read(&sess->nconn),
4114 sess->sess_ops->InitiatorName);
4116 * Make sure that if one connection fails in an non ERL=2 iSCSI
4117 * Session that they all fail.
4119 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4120 !atomic_read(&sess->session_logout))
4121 atomic_set(&sess->session_fall_back_to_erl0, 1);
4124 * If this was not the last connection in the session, and we are
4125 * performing session reinstatement or falling back to ERL=0, call
4126 * iscsit_stop_session() without sleeping to shutdown the other
4127 * active connections.
4129 if (atomic_read(&sess->nconn)) {
4130 if (!atomic_read(&sess->session_reinstatement) &&
4131 !atomic_read(&sess->session_fall_back_to_erl0)) {
4132 spin_unlock_bh(&sess->conn_lock);
4135 if (!atomic_read(&sess->session_stop_active)) {
4136 atomic_set(&sess->session_stop_active, 1);
4137 spin_unlock_bh(&sess->conn_lock);
4138 iscsit_stop_session(sess, 0, 0);
4141 spin_unlock_bh(&sess->conn_lock);
4146 * If this was the last connection in the session and one of the
4147 * following is occurring:
4149 * Session Reinstatement is not being performed, and are falling back
4150 * to ERL=0 call iscsit_close_session().
4152 * Session Logout was requested. iscsit_close_session() will be called
4155 * Session Continuation is not being performed, start the Time2Retain
4156 * handler and check if sleep_on_sess_wait_sem is active.
4158 if (!atomic_read(&sess->session_reinstatement) &&
4159 atomic_read(&sess->session_fall_back_to_erl0)) {
4160 spin_unlock_bh(&sess->conn_lock);
4161 target_put_session(sess->se_sess);
4164 } else if (atomic_read(&sess->session_logout)) {
4165 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4166 sess->session_state = TARG_SESS_STATE_FREE;
4167 spin_unlock_bh(&sess->conn_lock);
4169 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4170 complete(&sess->session_wait_comp);
4174 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4175 sess->session_state = TARG_SESS_STATE_FAILED;
4177 if (!atomic_read(&sess->session_continuation)) {
4178 spin_unlock_bh(&sess->conn_lock);
4179 iscsit_start_time2retain_handler(sess);
4181 spin_unlock_bh(&sess->conn_lock);
4183 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4184 complete(&sess->session_wait_comp);
4188 spin_unlock_bh(&sess->conn_lock);
4193 int iscsit_close_session(struct iscsi_session *sess)
4195 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4196 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4198 if (atomic_read(&sess->nconn)) {
4199 pr_err("%d connection(s) still exist for iSCSI session"
4200 " to %s\n", atomic_read(&sess->nconn),
4201 sess->sess_ops->InitiatorName);
4205 spin_lock_bh(&se_tpg->session_lock);
4206 atomic_set(&sess->session_logout, 1);
4207 atomic_set(&sess->session_reinstatement, 1);
4208 iscsit_stop_time2retain_timer(sess);
4209 spin_unlock_bh(&se_tpg->session_lock);
4212 * transport_deregister_session_configfs() will clear the
4213 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4214 * can be setting it again with __transport_register_session() in
4215 * iscsi_post_login_handler() again after the iscsit_stop_session()
4216 * completes in iscsi_np context.
4218 transport_deregister_session_configfs(sess->se_sess);
4221 * If any other processes are accessing this session pointer we must
4222 * wait until they have completed. If we are in an interrupt (the
4223 * time2retain handler) and contain and active session usage count we
4224 * restart the timer and exit.
4226 if (!in_interrupt()) {
4227 if (iscsit_check_session_usage_count(sess) == 1)
4228 iscsit_stop_session(sess, 1, 1);
4230 if (iscsit_check_session_usage_count(sess) == 2) {
4231 atomic_set(&sess->session_logout, 0);
4232 iscsit_start_time2retain_handler(sess);
4237 transport_deregister_session(sess->se_sess);
4239 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4240 iscsit_free_connection_recovery_entires(sess);
4242 iscsit_free_all_ooo_cmdsns(sess);
4244 spin_lock_bh(&se_tpg->session_lock);
4245 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4246 sess->session_state = TARG_SESS_STATE_FREE;
4247 pr_debug("Released iSCSI session from node: %s\n",
4248 sess->sess_ops->InitiatorName);
4251 tpg->tpg_tiqn->tiqn_nsessions--;
4253 pr_debug("Decremented number of active iSCSI Sessions on"
4254 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4256 spin_lock(&sess_idr_lock);
4257 idr_remove(&sess_idr, sess->session_index);
4258 spin_unlock(&sess_idr_lock);
4260 kfree(sess->sess_ops);
4261 sess->sess_ops = NULL;
4262 spin_unlock_bh(&se_tpg->session_lock);
4268 static void iscsit_logout_post_handler_closesession(
4269 struct iscsi_conn *conn)
4271 struct iscsi_session *sess = conn->sess;
4273 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4274 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4276 atomic_set(&conn->conn_logout_remove, 0);
4277 complete(&conn->conn_logout_comp);
4279 iscsit_dec_conn_usage_count(conn);
4280 iscsit_stop_session(sess, 1, 1);
4281 iscsit_dec_session_usage_count(sess);
4282 target_put_session(sess->se_sess);
4285 static void iscsit_logout_post_handler_samecid(
4286 struct iscsi_conn *conn)
4288 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4289 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4291 atomic_set(&conn->conn_logout_remove, 0);
4292 complete(&conn->conn_logout_comp);
4294 iscsit_cause_connection_reinstatement(conn, 1);
4295 iscsit_dec_conn_usage_count(conn);
4298 static void iscsit_logout_post_handler_diffcid(
4299 struct iscsi_conn *conn,
4302 struct iscsi_conn *l_conn;
4303 struct iscsi_session *sess = conn->sess;
4308 spin_lock_bh(&sess->conn_lock);
4309 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4310 if (l_conn->cid == cid) {
4311 iscsit_inc_conn_usage_count(l_conn);
4315 spin_unlock_bh(&sess->conn_lock);
4321 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4323 spin_lock_bh(&l_conn->state_lock);
4324 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4325 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4326 spin_unlock_bh(&l_conn->state_lock);
4328 iscsit_cause_connection_reinstatement(l_conn, 1);
4329 iscsit_dec_conn_usage_count(l_conn);
4333 * Return of 0 causes the TX thread to restart.
4335 static int iscsit_logout_post_handler(
4336 struct iscsi_cmd *cmd,
4337 struct iscsi_conn *conn)
4341 switch (cmd->logout_reason) {
4342 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4343 switch (cmd->logout_response) {
4344 case ISCSI_LOGOUT_SUCCESS:
4345 case ISCSI_LOGOUT_CLEANUP_FAILED:
4347 iscsit_logout_post_handler_closesession(conn);
4352 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4353 if (conn->cid == cmd->logout_cid) {
4354 switch (cmd->logout_response) {
4355 case ISCSI_LOGOUT_SUCCESS:
4356 case ISCSI_LOGOUT_CLEANUP_FAILED:
4358 iscsit_logout_post_handler_samecid(conn);
4363 switch (cmd->logout_response) {
4364 case ISCSI_LOGOUT_SUCCESS:
4365 iscsit_logout_post_handler_diffcid(conn,
4368 case ISCSI_LOGOUT_CID_NOT_FOUND:
4369 case ISCSI_LOGOUT_CLEANUP_FAILED:
4376 case ISCSI_LOGOUT_REASON_RECOVERY:
4377 switch (cmd->logout_response) {
4378 case ISCSI_LOGOUT_SUCCESS:
4379 case ISCSI_LOGOUT_CID_NOT_FOUND:
4380 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4381 case ISCSI_LOGOUT_CLEANUP_FAILED:
4394 void iscsit_fail_session(struct iscsi_session *sess)
4396 struct iscsi_conn *conn;
4398 spin_lock_bh(&sess->conn_lock);
4399 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4400 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4401 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4403 spin_unlock_bh(&sess->conn_lock);
4405 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4406 sess->session_state = TARG_SESS_STATE_FAILED;
4409 int iscsit_free_session(struct iscsi_session *sess)
4411 u16 conn_count = atomic_read(&sess->nconn);
4412 struct iscsi_conn *conn, *conn_tmp = NULL;
4415 spin_lock_bh(&sess->conn_lock);
4416 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4418 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4420 if (conn_count == 0)
4423 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4426 iscsit_inc_conn_usage_count(conn_tmp);
4429 iscsit_inc_conn_usage_count(conn);
4431 spin_unlock_bh(&sess->conn_lock);
4432 iscsit_cause_connection_reinstatement(conn, 1);
4433 spin_lock_bh(&sess->conn_lock);
4435 iscsit_dec_conn_usage_count(conn);
4437 iscsit_dec_conn_usage_count(conn_tmp);
4442 if (atomic_read(&sess->nconn)) {
4443 spin_unlock_bh(&sess->conn_lock);
4444 wait_for_completion(&sess->session_wait_comp);
4446 spin_unlock_bh(&sess->conn_lock);
4448 target_put_session(sess->se_sess);
4452 void iscsit_stop_session(
4453 struct iscsi_session *sess,
4455 int connection_sleep)
4457 u16 conn_count = atomic_read(&sess->nconn);
4458 struct iscsi_conn *conn, *conn_tmp = NULL;
4461 spin_lock_bh(&sess->conn_lock);
4463 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4465 if (connection_sleep) {
4466 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4468 if (conn_count == 0)
4471 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4474 iscsit_inc_conn_usage_count(conn_tmp);
4477 iscsit_inc_conn_usage_count(conn);
4479 spin_unlock_bh(&sess->conn_lock);
4480 iscsit_cause_connection_reinstatement(conn, 1);
4481 spin_lock_bh(&sess->conn_lock);
4483 iscsit_dec_conn_usage_count(conn);
4485 iscsit_dec_conn_usage_count(conn_tmp);
4489 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4490 iscsit_cause_connection_reinstatement(conn, 0);
4493 if (session_sleep && atomic_read(&sess->nconn)) {
4494 spin_unlock_bh(&sess->conn_lock);
4495 wait_for_completion(&sess->session_wait_comp);
4497 spin_unlock_bh(&sess->conn_lock);
4500 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4502 struct iscsi_session *sess;
4503 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4504 struct se_session *se_sess, *se_sess_tmp;
4505 int session_count = 0;
4507 spin_lock_bh(&se_tpg->session_lock);
4508 if (tpg->nsessions && !force) {
4509 spin_unlock_bh(&se_tpg->session_lock);
4513 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4515 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4517 spin_lock(&sess->conn_lock);
4518 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4519 atomic_read(&sess->session_logout) ||
4520 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4521 spin_unlock(&sess->conn_lock);
4524 atomic_set(&sess->session_reinstatement, 1);
4525 spin_unlock(&sess->conn_lock);
4526 spin_unlock_bh(&se_tpg->session_lock);
4528 iscsit_free_session(sess);
4529 spin_lock_bh(&se_tpg->session_lock);
4533 spin_unlock_bh(&se_tpg->session_lock);
4535 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4536 " Group: %hu\n", session_count, tpg->tpgt);
4540 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4541 MODULE_VERSION("4.1.x");
4542 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4543 MODULE_LICENSE("GPL");
4545 module_init(iscsi_target_init_module);
4546 module_exit(iscsi_target_cleanup_module);