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 <asm/unaligned.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/iscsi_proto.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_tmr.h>
31 #include <target/target_core_transport.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_MUTEX(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);
266 * Called with mutex np_lock held
268 static struct iscsi_np *iscsit_get_np(
269 struct __kernel_sockaddr_storage *sockaddr,
270 int network_transport)
272 struct sockaddr_in *sock_in, *sock_in_e;
273 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 list_for_each_entry(np, &g_np_list, np_list) {
279 spin_lock_bh(&np->np_thread_lock);
280 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
281 spin_unlock_bh(&np->np_thread_lock);
285 if (sockaddr->ss_family == AF_INET6) {
286 sock_in6 = (struct sockaddr_in6 *)sockaddr;
287 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
289 if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
290 (void *)&sock_in6_e->sin6_addr.in6_u,
291 sizeof(struct in6_addr)))
294 port = ntohs(sock_in6->sin6_port);
296 sock_in = (struct sockaddr_in *)sockaddr;
297 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
299 if (sock_in->sin_addr.s_addr ==
300 sock_in_e->sin_addr.s_addr)
303 port = ntohs(sock_in->sin_port);
306 if ((ip_match == 1) && (np->np_port == port) &&
307 (np->np_network_transport == network_transport)) {
309 * Increment the np_exports reference count now to
310 * prevent iscsit_del_np() below from being called
311 * while iscsi_tpg_add_network_portal() is called.
314 spin_unlock_bh(&np->np_thread_lock);
317 spin_unlock_bh(&np->np_thread_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 mutex_lock(&np_lock);
336 * Locate the existing struct iscsi_np if already active..
338 np = iscsit_get_np(sockaddr, network_transport);
340 mutex_unlock(&np_lock);
344 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
346 pr_err("Unable to allocate memory for struct iscsi_np\n");
347 mutex_unlock(&np_lock);
348 return ERR_PTR(-ENOMEM);
351 np->np_flags |= NPF_IP_NETWORK;
352 if (sockaddr->ss_family == AF_INET6) {
353 sock_in6 = (struct sockaddr_in6 *)sockaddr;
354 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
355 np->np_port = ntohs(sock_in6->sin6_port);
357 sock_in = (struct sockaddr_in *)sockaddr;
358 sprintf(np->np_ip, "%s", ip_str);
359 np->np_port = ntohs(sock_in->sin_port);
362 np->np_network_transport = network_transport;
363 spin_lock_init(&np->np_thread_lock);
364 init_completion(&np->np_restart_comp);
365 INIT_LIST_HEAD(&np->np_list);
367 ret = iscsi_target_setup_login_socket(np, sockaddr);
370 mutex_unlock(&np_lock);
374 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
375 if (IS_ERR(np->np_thread)) {
376 pr_err("Unable to create kthread: iscsi_np\n");
377 ret = PTR_ERR(np->np_thread);
379 mutex_unlock(&np_lock);
383 * Increment the np_exports reference count now to prevent
384 * iscsit_del_np() below from being run while a new call to
385 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
386 * active. We don't need to hold np->np_thread_lock at this
387 * point because iscsi_np has not been added to g_np_list yet.
390 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
392 list_add_tail(&np->np_list, &g_np_list);
393 mutex_unlock(&np_lock);
395 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
396 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
402 int iscsit_reset_np_thread(
404 struct iscsi_tpg_np *tpg_np,
405 struct iscsi_portal_group *tpg)
407 spin_lock_bh(&np->np_thread_lock);
410 * The reset operation need only be performed when the
411 * passed struct iscsi_portal_group has a login in progress
412 * to one of the network portals.
414 if (tpg_np->tpg_np->np_login_tpg != tpg) {
415 spin_unlock_bh(&np->np_thread_lock);
419 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
420 spin_unlock_bh(&np->np_thread_lock);
423 np->np_thread_state = ISCSI_NP_THREAD_RESET;
426 spin_unlock_bh(&np->np_thread_lock);
427 send_sig(SIGINT, np->np_thread, 1);
428 wait_for_completion(&np->np_restart_comp);
429 spin_lock_bh(&np->np_thread_lock);
431 spin_unlock_bh(&np->np_thread_lock);
436 int iscsit_del_np_comm(struct iscsi_np *np)
439 sock_release(np->np_socket);
443 int iscsit_del_np(struct iscsi_np *np)
445 spin_lock_bh(&np->np_thread_lock);
447 if (np->np_exports) {
448 spin_unlock_bh(&np->np_thread_lock);
451 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
452 spin_unlock_bh(&np->np_thread_lock);
456 * We need to send the signal to wakeup Linux/Net
457 * which may be sleeping in sock_accept()..
459 send_sig(SIGINT, np->np_thread, 1);
460 kthread_stop(np->np_thread);
462 iscsit_del_np_comm(np);
464 mutex_lock(&np_lock);
465 list_del(&np->np_list);
466 mutex_unlock(&np_lock);
468 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
469 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
476 static int __init iscsi_target_init_module(void)
480 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
482 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
483 if (!iscsit_global) {
484 pr_err("Unable to allocate memory for iscsit_global\n");
487 mutex_init(&auth_id_lock);
488 spin_lock_init(&sess_idr_lock);
492 ret = iscsi_target_register_configfs();
496 ret = iscsi_thread_set_init();
500 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
501 TARGET_THREAD_SET_COUNT) {
502 pr_err("iscsi_allocate_thread_sets() returned"
503 " unexpected value!\n");
507 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
508 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
510 if (!lio_cmd_cache) {
511 pr_err("Unable to kmem_cache_create() for"
516 lio_qr_cache = kmem_cache_create("lio_qr_cache",
517 sizeof(struct iscsi_queue_req),
518 __alignof__(struct iscsi_queue_req), 0, NULL);
520 pr_err("nable to kmem_cache_create() for"
525 lio_dr_cache = kmem_cache_create("lio_dr_cache",
526 sizeof(struct iscsi_datain_req),
527 __alignof__(struct iscsi_datain_req), 0, NULL);
529 pr_err("Unable to kmem_cache_create() for"
534 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
535 sizeof(struct iscsi_ooo_cmdsn),
536 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
537 if (!lio_ooo_cache) {
538 pr_err("Unable to kmem_cache_create() for"
543 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
544 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
546 if (!lio_r2t_cache) {
547 pr_err("Unable to kmem_cache_create() for"
552 if (iscsit_load_discovery_tpg() < 0)
557 kmem_cache_destroy(lio_r2t_cache);
559 kmem_cache_destroy(lio_ooo_cache);
561 kmem_cache_destroy(lio_dr_cache);
563 kmem_cache_destroy(lio_qr_cache);
565 kmem_cache_destroy(lio_cmd_cache);
567 iscsi_deallocate_thread_sets();
569 iscsi_thread_set_free();
571 iscsi_target_deregister_configfs();
573 kfree(iscsit_global);
577 static void __exit iscsi_target_cleanup_module(void)
579 iscsi_deallocate_thread_sets();
580 iscsi_thread_set_free();
581 iscsit_release_discovery_tpg();
582 kmem_cache_destroy(lio_cmd_cache);
583 kmem_cache_destroy(lio_qr_cache);
584 kmem_cache_destroy(lio_dr_cache);
585 kmem_cache_destroy(lio_ooo_cache);
586 kmem_cache_destroy(lio_r2t_cache);
588 iscsi_target_deregister_configfs();
590 kfree(iscsit_global);
593 int iscsit_add_reject(
597 struct iscsi_conn *conn)
599 struct iscsi_cmd *cmd;
600 struct iscsi_reject *hdr;
603 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
607 cmd->iscsi_opcode = ISCSI_OP_REJECT;
609 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
611 hdr = (struct iscsi_reject *) cmd->pdu;
612 hdr->reason = reason;
614 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
616 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
617 iscsit_release_cmd(cmd);
621 spin_lock_bh(&conn->cmd_lock);
622 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
623 spin_unlock_bh(&conn->cmd_lock);
625 cmd->i_state = ISTATE_SEND_REJECT;
626 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
628 ret = wait_for_completion_interruptible(&cmd->reject_comp);
632 return (!fail_conn) ? 0 : -1;
635 int iscsit_add_reject_from_cmd(
640 struct iscsi_cmd *cmd)
642 struct iscsi_conn *conn;
643 struct iscsi_reject *hdr;
647 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
653 cmd->iscsi_opcode = ISCSI_OP_REJECT;
655 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
657 hdr = (struct iscsi_reject *) cmd->pdu;
658 hdr->reason = reason;
660 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
662 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
663 iscsit_release_cmd(cmd);
668 spin_lock_bh(&conn->cmd_lock);
669 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
670 spin_unlock_bh(&conn->cmd_lock);
673 cmd->i_state = ISTATE_SEND_REJECT;
674 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
676 ret = wait_for_completion_interruptible(&cmd->reject_comp);
680 return (!fail_conn) ? 0 : -1;
684 * Map some portion of the allocated scatterlist to an iovec, suitable for
685 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
686 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
687 * either case (see iscsit_alloc_buffs)
689 static int iscsit_map_iovec(
690 struct iscsi_cmd *cmd,
696 struct scatterlist *sg;
697 unsigned int page_off;
700 * We have a private mapping of the allocated pages in t_mem_sg.
701 * At this point, we also know each contains a page.
703 sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
704 page_off = (data_offset % PAGE_SIZE);
706 cmd->first_data_sg = sg;
707 cmd->first_data_sg_off = page_off;
709 while (data_length) {
710 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
712 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
713 iov[i].iov_len = cur_len;
715 data_length -= cur_len;
721 cmd->kmapped_nents = i;
726 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
729 struct scatterlist *sg;
731 sg = cmd->first_data_sg;
733 for (i = 0; i < cmd->kmapped_nents; i++)
734 kunmap(sg_page(&sg[i]));
737 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
739 struct iscsi_cmd *cmd;
741 conn->exp_statsn = exp_statsn;
743 spin_lock_bh(&conn->cmd_lock);
744 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
745 spin_lock(&cmd->istate_lock);
746 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
747 (cmd->stat_sn < exp_statsn)) {
748 cmd->i_state = ISTATE_REMOVE;
749 spin_unlock(&cmd->istate_lock);
750 iscsit_add_cmd_to_immediate_queue(cmd, conn,
754 spin_unlock(&cmd->istate_lock);
756 spin_unlock_bh(&conn->cmd_lock);
759 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
761 u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
762 cmd->se_cmd.t_data_nents;
764 iov_count += ISCSI_IOV_DATA_BUFFER;
766 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
767 if (!cmd->iov_data) {
768 pr_err("Unable to allocate cmd->iov_data\n");
772 cmd->orig_iov_data_count = iov_count;
776 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
778 struct scatterlist *sgl;
779 u32 length = cmd->se_cmd.data_length;
780 int nents = DIV_ROUND_UP(length, PAGE_SIZE);
781 int i = 0, j = 0, ret;
783 * If no SCSI payload is present, allocate the default iovecs used for
787 return iscsit_allocate_iovecs(cmd);
789 sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
793 sg_init_table(sgl, nents);
796 int buf_size = min_t(int, length, PAGE_SIZE);
799 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
801 goto page_alloc_failed;
803 sg_set_page(&sgl[i], page, buf_size, 0);
810 cmd->t_mem_sg_nents = nents;
812 /* BIDI ops not supported */
814 /* Tell the core about our preallocated memory */
815 transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
817 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
818 * so that cmd->se_cmd.t_tasks_se_num has been set.
820 ret = iscsit_allocate_iovecs(cmd);
828 __free_page(sg_page(&sgl[j++]));
834 static int iscsit_handle_scsi_cmd(
835 struct iscsi_conn *conn,
838 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
839 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
840 struct iscsi_cmd *cmd = NULL;
841 struct iscsi_scsi_req *hdr;
843 spin_lock_bh(&conn->sess->session_stats_lock);
844 conn->sess->cmd_pdus++;
845 if (conn->sess->se_sess->se_node_acl) {
846 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
847 conn->sess->se_sess->se_node_acl->num_cmds++;
848 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
850 spin_unlock_bh(&conn->sess->session_stats_lock);
852 hdr = (struct iscsi_scsi_req *) buf;
853 payload_length = ntoh24(hdr->dlength);
854 hdr->itt = be32_to_cpu(hdr->itt);
855 hdr->data_length = be32_to_cpu(hdr->data_length);
856 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
857 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
859 /* FIXME; Add checks for AdditionalHeaderSegment */
861 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
862 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
863 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
864 " not set. Bad iSCSI Initiator.\n");
865 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
869 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
870 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
872 * From RFC-3720 Section 10.3.1:
874 * "Either or both of R and W MAY be 1 when either the
875 * Expected Data Transfer Length and/or Bidirectional Read
876 * Expected Data Transfer Length are 0"
878 * For this case, go ahead and clear the unnecssary bits
879 * to avoid any confusion with ->data_direction.
881 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
882 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
884 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
885 " set when Expected Data Transfer Length is 0 for"
886 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
889 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
890 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
891 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
892 " MUST be set if Expected Data Transfer Length is not 0."
893 " Bad iSCSI Initiator\n");
894 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
898 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
899 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
900 pr_err("Bidirectional operations not supported!\n");
901 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
905 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
906 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
907 " Scsi Command PDU.\n");
908 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
912 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
913 pr_err("ImmediateData=No but DataSegmentLength=%u,"
914 " protocol error.\n", payload_length);
915 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
919 if ((hdr->data_length == payload_length) &&
920 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
921 pr_err("Expected Data Transfer Length and Length of"
922 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
923 " bit is not set protocol error\n");
924 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
928 if (payload_length > hdr->data_length) {
929 pr_err("DataSegmentLength: %u is greater than"
930 " EDTL: %u, protocol error.\n", payload_length,
932 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
936 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
937 pr_err("DataSegmentLength: %u is greater than"
938 " MaxRecvDataSegmentLength: %u, protocol error.\n",
939 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
940 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
944 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
945 pr_err("DataSegmentLength: %u is greater than"
946 " FirstBurstLength: %u, protocol error.\n",
947 payload_length, conn->sess->sess_ops->FirstBurstLength);
948 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
952 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
953 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
956 cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
957 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
959 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
962 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
963 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
964 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
966 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
967 cmd->i_state = ISTATE_NEW_CMD;
968 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
969 cmd->immediate_data = (payload_length) ? 1 : 0;
970 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
971 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
972 if (cmd->unsolicited_data)
973 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
975 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
976 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
977 spin_lock_bh(&conn->sess->ttt_lock);
978 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
979 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
980 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
981 spin_unlock_bh(&conn->sess->ttt_lock);
982 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
983 cmd->targ_xfer_tag = 0xFFFFFFFF;
984 cmd->cmd_sn = hdr->cmdsn;
985 cmd->exp_stat_sn = hdr->exp_statsn;
986 cmd->first_burst_len = payload_length;
988 if (cmd->data_direction == DMA_FROM_DEVICE) {
989 struct iscsi_datain_req *dr;
991 dr = iscsit_allocate_datain_req();
993 return iscsit_add_reject_from_cmd(
994 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
997 iscsit_attach_datain_req(cmd, dr);
1001 * The CDB is going to an se_device_t.
1003 ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1004 get_unaligned_le64(&hdr->lun));
1006 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1007 pr_debug("Responding to non-acl'ed,"
1008 " non-existent or non-exported iSCSI LUN:"
1009 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1011 send_check_condition = 1;
1015 * The Initiator Node has access to the LUN (the addressing method
1016 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1017 * allocate 1->N transport tasks (depending on sector count and
1018 * maximum request size the physical HBA(s) can handle.
1020 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1021 if (transport_ret == -ENOMEM) {
1022 return iscsit_add_reject_from_cmd(
1023 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1025 } else if (transport_ret < 0) {
1027 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1028 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1031 send_check_condition = 1;
1033 cmd->data_length = cmd->se_cmd.data_length;
1035 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1036 return iscsit_add_reject_from_cmd(
1037 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1042 spin_lock_bh(&conn->cmd_lock);
1043 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1044 spin_unlock_bh(&conn->cmd_lock);
1046 * Check if we need to delay processing because of ALUA
1047 * Active/NonOptimized primary access state..
1049 core_alua_check_nonop_delay(&cmd->se_cmd);
1051 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1052 * also call iscsit_allocate_iovecs()
1054 ret = iscsit_alloc_buffs(cmd);
1056 return iscsit_add_reject_from_cmd(
1057 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1060 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1061 * the Immediate Bit is not set, and no Immediate
1064 * A PDU/CmdSN carrying Immediate Data can only
1065 * be processed after the DataCRC has passed.
1066 * If the DataCRC fails, the CmdSN MUST NOT
1067 * be acknowledged. (See below)
1069 if (!cmd->immediate_data) {
1070 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1071 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1073 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1074 return iscsit_add_reject_from_cmd(
1075 ISCSI_REASON_PROTOCOL_ERROR,
1079 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1082 * If no Immediate Data is attached, it's OK to return now.
1084 if (!cmd->immediate_data) {
1085 if (send_check_condition)
1088 if (cmd->unsolicited_data) {
1089 iscsit_set_dataout_sequence_values(cmd);
1091 spin_lock_bh(&cmd->dataout_timeout_lock);
1092 iscsit_start_dataout_timer(cmd, cmd->conn);
1093 spin_unlock_bh(&cmd->dataout_timeout_lock);
1100 * Early CHECK_CONDITIONs never make it to the transport processing
1101 * thread. They are processed in CmdSN order by
1102 * iscsit_check_received_cmdsn() below.
1104 if (send_check_condition) {
1105 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1106 dump_immediate_data = 1;
1107 goto after_immediate_data;
1110 * Call directly into transport_generic_new_cmd() to perform
1111 * the backend memory allocation.
1113 ret = transport_generic_new_cmd(&cmd->se_cmd);
1115 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1116 dump_immediate_data = 1;
1117 goto after_immediate_data;
1120 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1121 after_immediate_data:
1122 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1124 * A PDU/CmdSN carrying Immediate Data passed
1125 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1126 * Immediate Bit is not set.
1128 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1130 * Special case for Unsupported SAM WRITE Opcodes
1131 * and ImmediateData=Yes.
1133 if (dump_immediate_data) {
1134 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1136 } else if (cmd->unsolicited_data) {
1137 iscsit_set_dataout_sequence_values(cmd);
1139 spin_lock_bh(&cmd->dataout_timeout_lock);
1140 iscsit_start_dataout_timer(cmd, cmd->conn);
1141 spin_unlock_bh(&cmd->dataout_timeout_lock);
1144 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1145 return iscsit_add_reject_from_cmd(
1146 ISCSI_REASON_PROTOCOL_ERROR,
1149 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1151 * Immediate Data failed DataCRC and ERL>=1,
1152 * silently drop this PDU and let the initiator
1153 * plug the CmdSN gap.
1155 * FIXME: Send Unsolicited NOPIN with reserved
1156 * TTT here to help the initiator figure out
1157 * the missing CmdSN, although they should be
1158 * intelligent enough to determine the missing
1159 * CmdSN and issue a retry to plug the sequence.
1161 cmd->i_state = ISTATE_REMOVE;
1162 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1163 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1169 static u32 iscsit_do_crypto_hash_sg(
1170 struct hash_desc *hash,
1171 struct iscsi_cmd *cmd,
1179 struct scatterlist *sg;
1180 unsigned int page_off;
1182 crypto_hash_init(hash);
1184 sg = cmd->first_data_sg;
1185 page_off = cmd->first_data_sg_off;
1188 while (data_length) {
1189 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1191 crypto_hash_update(hash, &sg[i], cur_len);
1193 data_length -= cur_len;
1199 struct scatterlist pad_sg;
1201 sg_init_one(&pad_sg, pad_bytes, padding);
1202 crypto_hash_update(hash, &pad_sg, padding);
1204 crypto_hash_final(hash, (u8 *) &data_crc);
1209 static void iscsit_do_crypto_hash_buf(
1210 struct hash_desc *hash,
1217 struct scatterlist sg;
1219 crypto_hash_init(hash);
1221 sg_init_one(&sg, (u8 *)buf, payload_length);
1222 crypto_hash_update(hash, &sg, payload_length);
1225 sg_init_one(&sg, pad_bytes, padding);
1226 crypto_hash_update(hash, &sg, padding);
1228 crypto_hash_final(hash, data_crc);
1231 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1233 int iov_ret, ooo_cmdsn = 0, ret;
1234 u8 data_crc_failed = 0;
1235 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1236 u32 rx_size = 0, payload_length;
1237 struct iscsi_cmd *cmd = NULL;
1238 struct se_cmd *se_cmd;
1239 struct iscsi_data *hdr;
1241 unsigned long flags;
1243 hdr = (struct iscsi_data *) buf;
1244 payload_length = ntoh24(hdr->dlength);
1245 hdr->itt = be32_to_cpu(hdr->itt);
1246 hdr->ttt = be32_to_cpu(hdr->ttt);
1247 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1248 hdr->datasn = be32_to_cpu(hdr->datasn);
1249 hdr->offset = be32_to_cpu(hdr->offset);
1251 if (!payload_length) {
1252 pr_err("DataOUT payload is ZERO, protocol error.\n");
1253 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1258 spin_lock_bh(&conn->sess->session_stats_lock);
1259 conn->sess->rx_data_octets += payload_length;
1260 if (conn->sess->se_sess->se_node_acl) {
1261 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1262 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1263 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1265 spin_unlock_bh(&conn->sess->session_stats_lock);
1267 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1268 pr_err("DataSegmentLength: %u is greater than"
1269 " MaxRecvDataSegmentLength: %u\n", payload_length,
1270 conn->conn_ops->MaxRecvDataSegmentLength);
1271 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1275 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1280 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1281 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1282 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1283 payload_length, conn->cid);
1285 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1286 pr_err("Command ITT: 0x%08x received DataOUT after"
1287 " last DataOUT received, dumping payload\n",
1288 cmd->init_task_tag);
1289 return iscsit_dump_data_payload(conn, payload_length, 1);
1292 if (cmd->data_direction != DMA_TO_DEVICE) {
1293 pr_err("Command ITT: 0x%08x received DataOUT for a"
1294 " NON-WRITE command.\n", cmd->init_task_tag);
1295 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1298 se_cmd = &cmd->se_cmd;
1299 iscsit_mod_dataout_timer(cmd);
1301 if ((hdr->offset + payload_length) > cmd->data_length) {
1302 pr_err("DataOut Offset: %u, Length %u greater than"
1303 " iSCSI Command EDTL %u, protocol error.\n",
1304 hdr->offset, payload_length, cmd->data_length);
1305 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1309 if (cmd->unsolicited_data) {
1310 int dump_unsolicited_data = 0;
1312 if (conn->sess->sess_ops->InitialR2T) {
1313 pr_err("Received unexpected unsolicited data"
1314 " while InitialR2T=Yes, protocol error.\n");
1315 transport_send_check_condition_and_sense(&cmd->se_cmd,
1316 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1320 * Special case for dealing with Unsolicited DataOUT
1321 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1325 /* Something's amiss if we're not in WRITE_PENDING state... */
1326 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1327 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1328 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1330 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1331 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1332 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1333 dump_unsolicited_data = 1;
1334 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1336 if (dump_unsolicited_data) {
1338 * Check if a delayed TASK_ABORTED status needs to
1339 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1340 * received with the unsolicitied data out.
1342 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1343 iscsit_stop_dataout_timer(cmd);
1345 transport_check_aborted_status(se_cmd,
1346 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1347 return iscsit_dump_data_payload(conn, payload_length, 1);
1351 * For the normal solicited data path:
1353 * Check for a delayed TASK_ABORTED status and dump any
1354 * incoming data out payload if one exists. Also, when the
1355 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1356 * data out sequence, we decrement outstanding_r2ts. Once
1357 * outstanding_r2ts reaches zero, go ahead and send the delayed
1358 * TASK_ABORTED status.
1360 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1361 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1362 if (--cmd->outstanding_r2ts < 1) {
1363 iscsit_stop_dataout_timer(cmd);
1364 transport_check_aborted_status(
1368 return iscsit_dump_data_payload(conn, payload_length, 1);
1372 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1373 * within-command recovery checks before receiving the payload.
1375 ret = iscsit_check_pre_dataout(cmd, buf);
1376 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1378 else if (ret == DATAOUT_CANNOT_RECOVER)
1381 rx_size += payload_length;
1382 iov = &cmd->iov_data[0];
1384 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1388 iov_count += iov_ret;
1390 padding = ((-payload_length) & 3);
1392 iov[iov_count].iov_base = cmd->pad_bytes;
1393 iov[iov_count++].iov_len = padding;
1395 pr_debug("Receiving %u padding bytes.\n", padding);
1398 if (conn->conn_ops->DataDigest) {
1399 iov[iov_count].iov_base = &checksum;
1400 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1401 rx_size += ISCSI_CRC_LEN;
1404 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1406 iscsit_unmap_iovec(cmd);
1408 if (rx_got != rx_size)
1411 if (conn->conn_ops->DataDigest) {
1414 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1415 hdr->offset, payload_length, padding,
1418 if (checksum != data_crc) {
1419 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1420 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1421 " does not match computed 0x%08x\n",
1422 hdr->itt, hdr->offset, payload_length,
1423 hdr->datasn, checksum, data_crc);
1424 data_crc_failed = 1;
1426 pr_debug("Got CRC32C DataDigest 0x%08x for"
1427 " %u bytes of Data Out\n", checksum,
1432 * Increment post receive data and CRC values or perform
1433 * within-command recovery.
1435 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1436 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1438 else if (ret == DATAOUT_SEND_R2T) {
1439 iscsit_set_dataout_sequence_values(cmd);
1440 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1441 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1443 * Handle extra special case for out of order
1444 * Unsolicited Data Out.
1446 spin_lock_bh(&cmd->istate_lock);
1447 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1448 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1449 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1450 spin_unlock_bh(&cmd->istate_lock);
1452 iscsit_stop_dataout_timer(cmd);
1453 return (!ooo_cmdsn) ? transport_generic_handle_data(
1455 } else /* DATAOUT_CANNOT_RECOVER */
1461 static int iscsit_handle_nop_out(
1462 struct iscsi_conn *conn,
1465 unsigned char *ping_data = NULL;
1466 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1467 u32 checksum, data_crc, padding = 0, payload_length;
1469 struct iscsi_cmd *cmd = NULL;
1470 struct kvec *iov = NULL;
1471 struct iscsi_nopout *hdr;
1473 hdr = (struct iscsi_nopout *) buf;
1474 payload_length = ntoh24(hdr->dlength);
1475 lun = get_unaligned_le64(&hdr->lun);
1476 hdr->itt = be32_to_cpu(hdr->itt);
1477 hdr->ttt = be32_to_cpu(hdr->ttt);
1478 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1479 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1481 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1482 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1483 " not set, protocol error.\n");
1484 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1488 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1489 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1490 " greater than MaxRecvDataSegmentLength: %u, protocol"
1491 " error.\n", payload_length,
1492 conn->conn_ops->MaxRecvDataSegmentLength);
1493 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1497 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1498 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1499 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1500 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1503 * This is not a response to a Unsolicited NopIN, which means
1504 * it can either be a NOPOUT ping request (with a valid ITT),
1505 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1506 * Either way, make sure we allocate an struct iscsi_cmd, as both
1507 * can contain ping data.
1509 if (hdr->ttt == 0xFFFFFFFF) {
1510 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1512 return iscsit_add_reject(
1513 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1516 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1517 cmd->i_state = ISTATE_SEND_NOPIN;
1518 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1520 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1521 cmd->targ_xfer_tag = 0xFFFFFFFF;
1522 cmd->cmd_sn = hdr->cmdsn;
1523 cmd->exp_stat_sn = hdr->exp_statsn;
1524 cmd->data_direction = DMA_NONE;
1527 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1528 rx_size = payload_length;
1529 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1531 pr_err("Unable to allocate memory for"
1532 " NOPOUT ping data.\n");
1537 iov = &cmd->iov_misc[0];
1538 iov[niov].iov_base = ping_data;
1539 iov[niov++].iov_len = payload_length;
1541 padding = ((-payload_length) & 3);
1543 pr_debug("Receiving %u additional bytes"
1544 " for padding.\n", padding);
1545 iov[niov].iov_base = &cmd->pad_bytes;
1546 iov[niov++].iov_len = padding;
1549 if (conn->conn_ops->DataDigest) {
1550 iov[niov].iov_base = &checksum;
1551 iov[niov++].iov_len = ISCSI_CRC_LEN;
1552 rx_size += ISCSI_CRC_LEN;
1555 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1556 if (rx_got != rx_size) {
1561 if (conn->conn_ops->DataDigest) {
1562 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1563 ping_data, payload_length,
1564 padding, cmd->pad_bytes,
1567 if (checksum != data_crc) {
1568 pr_err("Ping data CRC32C DataDigest"
1569 " 0x%08x does not match computed 0x%08x\n",
1570 checksum, data_crc);
1571 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1572 pr_err("Unable to recover from"
1573 " NOPOUT Ping DataCRC failure while in"
1579 * Silently drop this PDU and let the
1580 * initiator plug the CmdSN gap.
1582 pr_debug("Dropping NOPOUT"
1583 " Command CmdSN: 0x%08x due to"
1584 " DataCRC error.\n", hdr->cmdsn);
1589 pr_debug("Got CRC32C DataDigest"
1590 " 0x%08x for %u bytes of ping data.\n",
1591 checksum, payload_length);
1595 ping_data[payload_length] = '\0';
1597 * Attach ping data to struct iscsi_cmd->buf_ptr.
1599 cmd->buf_ptr = (void *)ping_data;
1600 cmd->buf_ptr_size = payload_length;
1602 pr_debug("Got %u bytes of NOPOUT ping"
1603 " data.\n", payload_length);
1604 pr_debug("Ping Data: \"%s\"\n", ping_data);
1607 if (hdr->itt != 0xFFFFFFFF) {
1609 pr_err("Checking CmdSN for NOPOUT,"
1610 " but cmd is NULL!\n");
1614 * Initiator is expecting a NopIN ping reply,
1616 spin_lock_bh(&conn->cmd_lock);
1617 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1618 spin_unlock_bh(&conn->cmd_lock);
1620 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1622 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1623 iscsit_add_cmd_to_response_queue(cmd, conn,
1628 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1629 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1633 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1634 return iscsit_add_reject_from_cmd(
1635 ISCSI_REASON_PROTOCOL_ERROR,
1641 if (hdr->ttt != 0xFFFFFFFF) {
1643 * This was a response to a unsolicited NOPIN ping.
1645 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1649 iscsit_stop_nopin_response_timer(conn);
1651 cmd->i_state = ISTATE_REMOVE;
1652 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1653 iscsit_start_nopin_timer(conn);
1656 * Initiator is not expecting a NOPIN is response.
1657 * Just ignore for now.
1659 * iSCSI v19-91 10.18
1660 * "A NOP-OUT may also be used to confirm a changed
1661 * ExpStatSN if another PDU will not be available
1671 iscsit_release_cmd(cmd);
1677 static int iscsit_handle_task_mgt_cmd(
1678 struct iscsi_conn *conn,
1681 struct iscsi_cmd *cmd;
1682 struct se_tmr_req *se_tmr;
1683 struct iscsi_tmr_req *tmr_req;
1684 struct iscsi_tm *hdr;
1686 int out_of_order_cmdsn = 0;
1690 hdr = (struct iscsi_tm *) buf;
1691 payload_length = ntoh24(hdr->dlength);
1692 hdr->itt = be32_to_cpu(hdr->itt);
1693 hdr->rtt = be32_to_cpu(hdr->rtt);
1694 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1695 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1696 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1697 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1698 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1699 function = hdr->flags;
1701 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1702 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1703 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1704 hdr->rtt, hdr->refcmdsn, conn->cid);
1706 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1707 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1708 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1709 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1710 hdr->rtt = ISCSI_RESERVED_TAG;
1713 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1714 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1715 pr_err("Task Management Request TASK_REASSIGN not"
1716 " issued as immediate command, bad iSCSI Initiator"
1717 "implementation\n");
1718 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1721 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1722 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1723 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1725 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1727 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1730 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1731 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1732 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1733 cmd->init_task_tag = hdr->itt;
1734 cmd->targ_xfer_tag = 0xFFFFFFFF;
1735 cmd->cmd_sn = hdr->cmdsn;
1736 cmd->exp_stat_sn = hdr->exp_statsn;
1737 se_tmr = cmd->se_cmd.se_tmr_req;
1738 tmr_req = cmd->tmr_req;
1740 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1742 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1743 ret = iscsit_get_lun_for_tmr(cmd,
1744 get_unaligned_le64(&hdr->lun));
1746 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1747 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1753 case ISCSI_TM_FUNC_ABORT_TASK:
1754 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1755 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1756 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1760 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1761 case ISCSI_TM_FUNC_CLEAR_ACA:
1762 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1763 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1765 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1766 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1767 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1768 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1772 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1773 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1774 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1775 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1779 case ISCSI_TM_FUNC_TASK_REASSIGN:
1780 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1782 * Perform sanity checks on the ExpDataSN only if the
1783 * TASK_REASSIGN was successful.
1785 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1788 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1789 return iscsit_add_reject_from_cmd(
1790 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1794 pr_err("Unknown TMR function: 0x%02x, protocol"
1795 " error.\n", function);
1796 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1797 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1801 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1802 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1803 se_tmr->call_transport = 1;
1805 spin_lock_bh(&conn->cmd_lock);
1806 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1807 spin_unlock_bh(&conn->cmd_lock);
1809 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1810 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1811 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1812 out_of_order_cmdsn = 1;
1813 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1815 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1816 return iscsit_add_reject_from_cmd(
1817 ISCSI_REASON_PROTOCOL_ERROR,
1820 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1822 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1825 * Found the referenced task, send to transport for processing.
1827 if (se_tmr->call_transport)
1828 return transport_generic_handle_tmr(&cmd->se_cmd);
1831 * Could not find the referenced LUN, task, or Task Management
1832 * command not authorized or supported. Change state and
1833 * let the tx_thread send the response.
1835 * For connection recovery, this is also the default action for
1836 * TMR TASK_REASSIGN.
1838 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1842 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1843 static int iscsit_handle_text_cmd(
1844 struct iscsi_conn *conn,
1847 char *text_ptr, *text_in;
1848 int cmdsn_ret, niov = 0, rx_got, rx_size;
1849 u32 checksum = 0, data_crc = 0, payload_length;
1850 u32 padding = 0, pad_bytes = 0, text_length = 0;
1851 struct iscsi_cmd *cmd;
1853 struct iscsi_text *hdr;
1855 hdr = (struct iscsi_text *) buf;
1856 payload_length = ntoh24(hdr->dlength);
1857 hdr->itt = be32_to_cpu(hdr->itt);
1858 hdr->ttt = be32_to_cpu(hdr->ttt);
1859 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1860 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1862 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1863 pr_err("Unable to accept text parameter length: %u"
1864 "greater than MaxRecvDataSegmentLength %u.\n",
1865 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1866 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1870 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1871 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1872 hdr->exp_statsn, payload_length);
1874 rx_size = text_length = payload_length;
1876 text_in = kzalloc(text_length, GFP_KERNEL);
1878 pr_err("Unable to allocate memory for"
1879 " incoming text parameters\n");
1883 memset(iov, 0, 3 * sizeof(struct kvec));
1884 iov[niov].iov_base = text_in;
1885 iov[niov++].iov_len = text_length;
1887 padding = ((-payload_length) & 3);
1889 iov[niov].iov_base = &pad_bytes;
1890 iov[niov++].iov_len = padding;
1892 pr_debug("Receiving %u additional bytes"
1893 " for padding.\n", padding);
1895 if (conn->conn_ops->DataDigest) {
1896 iov[niov].iov_base = &checksum;
1897 iov[niov++].iov_len = ISCSI_CRC_LEN;
1898 rx_size += ISCSI_CRC_LEN;
1901 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1902 if (rx_got != rx_size) {
1907 if (conn->conn_ops->DataDigest) {
1908 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1909 text_in, text_length,
1910 padding, (u8 *)&pad_bytes,
1913 if (checksum != data_crc) {
1914 pr_err("Text data CRC32C DataDigest"
1915 " 0x%08x does not match computed"
1916 " 0x%08x\n", checksum, data_crc);
1917 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1918 pr_err("Unable to recover from"
1919 " Text Data digest failure while in"
1925 * Silently drop this PDU and let the
1926 * initiator plug the CmdSN gap.
1928 pr_debug("Dropping Text"
1929 " Command CmdSN: 0x%08x due to"
1930 " DataCRC error.\n", hdr->cmdsn);
1935 pr_debug("Got CRC32C DataDigest"
1936 " 0x%08x for %u bytes of text data.\n",
1937 checksum, text_length);
1940 text_in[text_length - 1] = '\0';
1941 pr_debug("Successfully read %d bytes of text"
1942 " data.\n", text_length);
1944 if (strncmp("SendTargets", text_in, 11) != 0) {
1945 pr_err("Received Text Data that is not"
1946 " SendTargets, cannot continue.\n");
1950 text_ptr = strchr(text_in, '=');
1952 pr_err("No \"=\" separator found in Text Data,"
1953 " cannot continue.\n");
1957 if (strncmp("=All", text_ptr, 4) != 0) {
1958 pr_err("Unable to locate All value for"
1959 " SendTargets key, cannot continue.\n");
1963 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1967 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1969 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1972 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1973 cmd->i_state = ISTATE_SEND_TEXTRSP;
1974 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1975 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1976 cmd->targ_xfer_tag = 0xFFFFFFFF;
1977 cmd->cmd_sn = hdr->cmdsn;
1978 cmd->exp_stat_sn = hdr->exp_statsn;
1979 cmd->data_direction = DMA_NONE;
1981 spin_lock_bh(&conn->cmd_lock);
1982 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1983 spin_unlock_bh(&conn->cmd_lock);
1985 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1987 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1988 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1989 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1990 return iscsit_add_reject_from_cmd(
1991 ISCSI_REASON_PROTOCOL_ERROR,
1997 return iscsit_execute_cmd(cmd, 0);
2000 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2002 struct iscsi_conn *conn_p;
2003 struct iscsi_session *sess = conn->sess;
2005 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2006 " for SID: %u.\n", conn->cid, conn->sess->sid);
2008 atomic_set(&sess->session_logout, 1);
2009 atomic_set(&conn->conn_logout_remove, 1);
2010 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2012 iscsit_inc_conn_usage_count(conn);
2013 iscsit_inc_session_usage_count(sess);
2015 spin_lock_bh(&sess->conn_lock);
2016 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2017 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2020 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2021 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2023 spin_unlock_bh(&sess->conn_lock);
2025 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2030 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2032 struct iscsi_conn *l_conn;
2033 struct iscsi_session *sess = conn->sess;
2035 pr_debug("Received logout request CLOSECONNECTION for CID:"
2036 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2039 * A Logout Request with a CLOSECONNECTION reason code for a CID
2040 * can arrive on a connection with a differing CID.
2042 if (conn->cid == cmd->logout_cid) {
2043 spin_lock_bh(&conn->state_lock);
2044 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2045 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2047 atomic_set(&conn->conn_logout_remove, 1);
2048 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2049 iscsit_inc_conn_usage_count(conn);
2051 spin_unlock_bh(&conn->state_lock);
2054 * Handle all different cid CLOSECONNECTION requests in
2055 * iscsit_logout_post_handler_diffcid() as to give enough
2056 * time for any non immediate command's CmdSN to be
2057 * acknowledged on the connection in question.
2059 * Here we simply make sure the CID is still around.
2061 l_conn = iscsit_get_conn_from_cid(sess,
2064 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2065 iscsit_add_cmd_to_response_queue(cmd, conn,
2070 iscsit_dec_conn_usage_count(l_conn);
2073 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2078 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2080 struct iscsi_session *sess = conn->sess;
2082 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2083 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2085 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2086 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2087 " while ERL!=2.\n");
2088 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2089 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2093 if (conn->cid == cmd->logout_cid) {
2094 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2095 " with CID: %hu on CID: %hu, implementation error.\n",
2096 cmd->logout_cid, conn->cid);
2097 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2098 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2102 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2107 static int iscsit_handle_logout_cmd(
2108 struct iscsi_conn *conn,
2111 int cmdsn_ret, logout_remove = 0;
2113 struct iscsi_cmd *cmd;
2114 struct iscsi_logout *hdr;
2115 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2117 hdr = (struct iscsi_logout *) buf;
2118 reason_code = (hdr->flags & 0x7f);
2119 hdr->itt = be32_to_cpu(hdr->itt);
2120 hdr->cid = be16_to_cpu(hdr->cid);
2121 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2122 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2125 spin_lock(&tiqn->logout_stats.lock);
2126 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2127 tiqn->logout_stats.normal_logouts++;
2129 tiqn->logout_stats.abnormal_logouts++;
2130 spin_unlock(&tiqn->logout_stats.lock);
2133 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2134 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2135 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2136 hdr->cid, conn->cid);
2138 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2139 pr_err("Received logout request on connection that"
2140 " is not in logged in state, ignoring request.\n");
2144 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2146 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2149 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2150 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2151 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2152 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2153 cmd->targ_xfer_tag = 0xFFFFFFFF;
2154 cmd->cmd_sn = hdr->cmdsn;
2155 cmd->exp_stat_sn = hdr->exp_statsn;
2156 cmd->logout_cid = hdr->cid;
2157 cmd->logout_reason = reason_code;
2158 cmd->data_direction = DMA_NONE;
2161 * We need to sleep in these cases (by returning 1) until the Logout
2162 * Response gets sent in the tx thread.
2164 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2165 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2166 (hdr->cid == conn->cid)))
2169 spin_lock_bh(&conn->cmd_lock);
2170 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2171 spin_unlock_bh(&conn->cmd_lock);
2173 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2174 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2177 * Immediate commands are executed, well, immediately.
2178 * Non-Immediate Logout Commands are executed in CmdSN order.
2180 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2181 int ret = iscsit_execute_cmd(cmd, 0);
2186 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2187 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2189 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2190 return iscsit_add_reject_from_cmd(
2191 ISCSI_REASON_PROTOCOL_ERROR,
2196 return logout_remove;
2199 static int iscsit_handle_snack(
2200 struct iscsi_conn *conn,
2205 struct iscsi_snack *hdr;
2207 hdr = (struct iscsi_snack *) buf;
2208 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2209 lun = get_unaligned_le64(&hdr->lun);
2210 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2211 hdr->itt = be32_to_cpu(hdr->itt);
2212 hdr->ttt = be32_to_cpu(hdr->ttt);
2213 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2214 hdr->begrun = be32_to_cpu(hdr->begrun);
2215 hdr->runlength = be32_to_cpu(hdr->runlength);
2217 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2218 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2219 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2220 hdr->begrun, hdr->runlength, conn->cid);
2222 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2223 pr_err("Initiator sent SNACK request while in"
2224 " ErrorRecoveryLevel=0.\n");
2225 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2229 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2230 * call from inside iscsi_send_recovery_datain_or_r2t().
2232 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2234 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2235 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2236 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2237 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2238 hdr->begrun, hdr->runlength);
2239 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2240 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2242 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2243 /* FIXME: Support R-Data SNACK */
2244 pr_err("R-Data SNACK Not Supported.\n");
2245 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2248 pr_err("Unknown SNACK type 0x%02x, protocol"
2249 " error.\n", hdr->flags & 0x0f);
2250 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2257 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2259 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2260 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2261 wait_for_completion_interruptible_timeout(
2262 &conn->rx_half_close_comp,
2263 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2267 static int iscsit_handle_immediate_data(
2268 struct iscsi_cmd *cmd,
2272 int iov_ret, rx_got = 0, rx_size = 0;
2273 u32 checksum, iov_count = 0, padding = 0;
2274 struct iscsi_conn *conn = cmd->conn;
2277 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2279 return IMMEDIATE_DATA_CANNOT_RECOVER;
2282 iov_count = iov_ret;
2283 iov = &cmd->iov_data[0];
2285 padding = ((-length) & 3);
2287 iov[iov_count].iov_base = cmd->pad_bytes;
2288 iov[iov_count++].iov_len = padding;
2292 if (conn->conn_ops->DataDigest) {
2293 iov[iov_count].iov_base = &checksum;
2294 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2295 rx_size += ISCSI_CRC_LEN;
2298 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2300 iscsit_unmap_iovec(cmd);
2302 if (rx_got != rx_size) {
2303 iscsit_rx_thread_wait_for_tcp(conn);
2304 return IMMEDIATE_DATA_CANNOT_RECOVER;
2307 if (conn->conn_ops->DataDigest) {
2310 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2311 cmd->write_data_done, length, padding,
2314 if (checksum != data_crc) {
2315 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2316 " does not match computed 0x%08x\n", checksum,
2319 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2320 pr_err("Unable to recover from"
2321 " Immediate Data digest failure while"
2323 iscsit_add_reject_from_cmd(
2324 ISCSI_REASON_DATA_DIGEST_ERROR,
2326 return IMMEDIATE_DATA_CANNOT_RECOVER;
2328 iscsit_add_reject_from_cmd(
2329 ISCSI_REASON_DATA_DIGEST_ERROR,
2331 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2334 pr_debug("Got CRC32C DataDigest 0x%08x for"
2335 " %u bytes of Immediate Data\n", checksum,
2340 cmd->write_data_done += length;
2342 if (cmd->write_data_done == cmd->data_length) {
2343 spin_lock_bh(&cmd->istate_lock);
2344 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2345 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2346 spin_unlock_bh(&cmd->istate_lock);
2349 return IMMEDIATE_DATA_NORMAL_OPERATION;
2353 * Called with sess->conn_lock held.
2355 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2356 with active network interface */
2357 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2359 struct iscsi_cmd *cmd;
2360 struct iscsi_conn *conn_p;
2363 * Only send a Asynchronous Message on connections whos network
2364 * interface is still functional.
2366 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2367 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2368 iscsit_inc_conn_usage_count(conn_p);
2376 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2378 iscsit_dec_conn_usage_count(conn_p);
2382 cmd->logout_cid = conn->cid;
2383 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2384 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2386 spin_lock_bh(&conn_p->cmd_lock);
2387 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2388 spin_unlock_bh(&conn_p->cmd_lock);
2390 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2391 iscsit_dec_conn_usage_count(conn_p);
2394 static int iscsit_send_conn_drop_async_message(
2395 struct iscsi_cmd *cmd,
2396 struct iscsi_conn *conn)
2398 struct iscsi_async *hdr;
2400 cmd->tx_size = ISCSI_HDR_LEN;
2401 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2403 hdr = (struct iscsi_async *) cmd->pdu;
2404 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2405 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2406 cmd->init_task_tag = 0xFFFFFFFF;
2407 cmd->targ_xfer_tag = 0xFFFFFFFF;
2408 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2409 cmd->stat_sn = conn->stat_sn++;
2410 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2411 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2412 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2413 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2414 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2415 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2416 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2418 if (conn->conn_ops->HeaderDigest) {
2419 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2421 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2422 (unsigned char *)hdr, ISCSI_HDR_LEN,
2423 0, NULL, (u8 *)header_digest);
2425 cmd->tx_size += ISCSI_CRC_LEN;
2426 pr_debug("Attaching CRC32C HeaderDigest to"
2427 " Async Message 0x%08x\n", *header_digest);
2430 cmd->iov_misc[0].iov_base = cmd->pdu;
2431 cmd->iov_misc[0].iov_len = cmd->tx_size;
2432 cmd->iov_misc_count = 1;
2434 pr_debug("Sending Connection Dropped Async Message StatSN:"
2435 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2436 cmd->logout_cid, conn->cid);
2440 static int iscsit_send_data_in(
2441 struct iscsi_cmd *cmd,
2442 struct iscsi_conn *conn,
2445 int iov_ret = 0, set_statsn = 0;
2446 u32 iov_count = 0, tx_size = 0;
2447 struct iscsi_datain datain;
2448 struct iscsi_datain_req *dr;
2449 struct iscsi_data_rsp *hdr;
2452 memset(&datain, 0, sizeof(struct iscsi_datain));
2453 dr = iscsit_get_datain_values(cmd, &datain);
2455 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2456 cmd->init_task_tag);
2461 * Be paranoid and double check the logic for now.
2463 if ((datain.offset + datain.length) > cmd->data_length) {
2464 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2465 " datain.length: %u exceeds cmd->data_length: %u\n",
2466 cmd->init_task_tag, datain.offset, datain.length,
2471 spin_lock_bh(&conn->sess->session_stats_lock);
2472 conn->sess->tx_data_octets += datain.length;
2473 if (conn->sess->se_sess->se_node_acl) {
2474 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2475 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2476 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2478 spin_unlock_bh(&conn->sess->session_stats_lock);
2480 * Special case for successfully execution w/ both DATAIN
2483 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2484 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2485 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2487 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2488 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2489 iscsit_increment_maxcmdsn(cmd, conn->sess);
2490 cmd->stat_sn = conn->stat_sn++;
2492 } else if (dr->dr_complete ==
2493 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2497 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2498 memset(hdr, 0, ISCSI_HDR_LEN);
2499 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2500 hdr->flags = datain.flags;
2501 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2502 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2503 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2504 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2505 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2506 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2507 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2510 hton24(hdr->dlength, datain.length);
2511 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2512 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2513 (struct scsi_lun *)&hdr->lun);
2515 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2517 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2518 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2519 cpu_to_be32(cmd->targ_xfer_tag) :
2521 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2523 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2524 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2525 hdr->datasn = cpu_to_be32(datain.data_sn);
2526 hdr->offset = cpu_to_be32(datain.offset);
2528 iov = &cmd->iov_data[0];
2529 iov[iov_count].iov_base = cmd->pdu;
2530 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2531 tx_size += ISCSI_HDR_LEN;
2533 if (conn->conn_ops->HeaderDigest) {
2534 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2536 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2537 (unsigned char *)hdr, ISCSI_HDR_LEN,
2538 0, NULL, (u8 *)header_digest);
2540 iov[0].iov_len += ISCSI_CRC_LEN;
2541 tx_size += ISCSI_CRC_LEN;
2543 pr_debug("Attaching CRC32 HeaderDigest"
2544 " for DataIN PDU 0x%08x\n", *header_digest);
2547 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2551 iov_count += iov_ret;
2552 tx_size += datain.length;
2554 cmd->padding = ((-datain.length) & 3);
2556 iov[iov_count].iov_base = cmd->pad_bytes;
2557 iov[iov_count++].iov_len = cmd->padding;
2558 tx_size += cmd->padding;
2560 pr_debug("Attaching %u padding bytes\n",
2563 if (conn->conn_ops->DataDigest) {
2564 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2565 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2567 iov[iov_count].iov_base = &cmd->data_crc;
2568 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2569 tx_size += ISCSI_CRC_LEN;
2571 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2572 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2575 cmd->iov_data_count = iov_count;
2576 cmd->tx_size = tx_size;
2578 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2579 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2580 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2581 ntohl(hdr->offset), datain.length, conn->cid);
2583 if (dr->dr_complete) {
2584 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2586 iscsit_free_datain_req(cmd, dr);
2592 static int iscsit_send_logout_response(
2593 struct iscsi_cmd *cmd,
2594 struct iscsi_conn *conn)
2596 int niov = 0, tx_size;
2597 struct iscsi_conn *logout_conn = NULL;
2598 struct iscsi_conn_recovery *cr = NULL;
2599 struct iscsi_session *sess = conn->sess;
2601 struct iscsi_logout_rsp *hdr;
2603 * The actual shutting down of Sessions and/or Connections
2604 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2605 * is done in scsi_logout_post_handler().
2607 switch (cmd->logout_reason) {
2608 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2609 pr_debug("iSCSI session logout successful, setting"
2610 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2611 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2613 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2614 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2617 * For CLOSECONNECTION logout requests carrying
2618 * a matching logout CID -> local CID, the reference
2619 * for the local CID will have been incremented in
2620 * iscsi_logout_closeconnection().
2622 * For CLOSECONNECTION logout requests carrying
2623 * a different CID than the connection it arrived
2624 * on, the connection responding to cmd->logout_cid
2625 * is stopped in iscsit_logout_post_handler_diffcid().
2628 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2629 " successful.\n", cmd->logout_cid, conn->cid);
2630 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2632 case ISCSI_LOGOUT_REASON_RECOVERY:
2633 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2634 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2637 * If the connection is still active from our point of view
2638 * force connection recovery to occur.
2640 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2642 if ((logout_conn)) {
2643 iscsit_connection_reinstatement_rcfr(logout_conn);
2644 iscsit_dec_conn_usage_count(logout_conn);
2647 cr = iscsit_get_inactive_connection_recovery_entry(
2648 conn->sess, cmd->logout_cid);
2650 pr_err("Unable to locate CID: %hu for"
2651 " REMOVECONNFORRECOVERY Logout Request.\n",
2653 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2657 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2659 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2660 " for recovery for CID: %hu on CID: %hu successful.\n",
2661 cmd->logout_cid, conn->cid);
2662 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2665 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2666 cmd->logout_reason);
2670 tx_size = ISCSI_HDR_LEN;
2671 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2672 memset(hdr, 0, ISCSI_HDR_LEN);
2673 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2674 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2675 hdr->response = cmd->logout_response;
2676 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2677 cmd->stat_sn = conn->stat_sn++;
2678 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2680 iscsit_increment_maxcmdsn(cmd, conn->sess);
2681 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2682 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2684 iov = &cmd->iov_misc[0];
2685 iov[niov].iov_base = cmd->pdu;
2686 iov[niov++].iov_len = ISCSI_HDR_LEN;
2688 if (conn->conn_ops->HeaderDigest) {
2689 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2691 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2692 (unsigned char *)hdr, ISCSI_HDR_LEN,
2693 0, NULL, (u8 *)header_digest);
2695 iov[0].iov_len += ISCSI_CRC_LEN;
2696 tx_size += ISCSI_CRC_LEN;
2697 pr_debug("Attaching CRC32C HeaderDigest to"
2698 " Logout Response 0x%08x\n", *header_digest);
2700 cmd->iov_misc_count = niov;
2701 cmd->tx_size = tx_size;
2703 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2704 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2705 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2706 cmd->logout_cid, conn->cid);
2712 * Unsolicited NOPIN, either requesting a response or not.
2714 static int iscsit_send_unsolicited_nopin(
2715 struct iscsi_cmd *cmd,
2716 struct iscsi_conn *conn,
2719 int tx_size = ISCSI_HDR_LEN;
2720 struct iscsi_nopin *hdr;
2722 hdr = (struct iscsi_nopin *) cmd->pdu;
2723 memset(hdr, 0, ISCSI_HDR_LEN);
2724 hdr->opcode = ISCSI_OP_NOOP_IN;
2725 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2726 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2727 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2728 cmd->stat_sn = conn->stat_sn;
2729 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2730 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2731 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2733 if (conn->conn_ops->HeaderDigest) {
2734 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2736 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2737 (unsigned char *)hdr, ISCSI_HDR_LEN,
2738 0, NULL, (u8 *)header_digest);
2740 tx_size += ISCSI_CRC_LEN;
2741 pr_debug("Attaching CRC32C HeaderDigest to"
2742 " NopIN 0x%08x\n", *header_digest);
2745 cmd->iov_misc[0].iov_base = cmd->pdu;
2746 cmd->iov_misc[0].iov_len = tx_size;
2747 cmd->iov_misc_count = 1;
2748 cmd->tx_size = tx_size;
2750 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2751 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2756 static int iscsit_send_nopin_response(
2757 struct iscsi_cmd *cmd,
2758 struct iscsi_conn *conn)
2760 int niov = 0, tx_size;
2763 struct iscsi_nopin *hdr;
2765 tx_size = ISCSI_HDR_LEN;
2766 hdr = (struct iscsi_nopin *) cmd->pdu;
2767 memset(hdr, 0, ISCSI_HDR_LEN);
2768 hdr->opcode = ISCSI_OP_NOOP_IN;
2769 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2770 hton24(hdr->dlength, cmd->buf_ptr_size);
2771 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2772 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2773 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2774 cmd->stat_sn = conn->stat_sn++;
2775 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2777 iscsit_increment_maxcmdsn(cmd, conn->sess);
2778 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2779 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2781 iov = &cmd->iov_misc[0];
2782 iov[niov].iov_base = cmd->pdu;
2783 iov[niov++].iov_len = ISCSI_HDR_LEN;
2785 if (conn->conn_ops->HeaderDigest) {
2786 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2788 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2789 (unsigned char *)hdr, ISCSI_HDR_LEN,
2790 0, NULL, (u8 *)header_digest);
2792 iov[0].iov_len += ISCSI_CRC_LEN;
2793 tx_size += ISCSI_CRC_LEN;
2794 pr_debug("Attaching CRC32C HeaderDigest"
2795 " to NopIn 0x%08x\n", *header_digest);
2799 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2800 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2802 if (cmd->buf_ptr_size) {
2803 iov[niov].iov_base = cmd->buf_ptr;
2804 iov[niov++].iov_len = cmd->buf_ptr_size;
2805 tx_size += cmd->buf_ptr_size;
2807 pr_debug("Echoing back %u bytes of ping"
2808 " data.\n", cmd->buf_ptr_size);
2810 padding = ((-cmd->buf_ptr_size) & 3);
2812 iov[niov].iov_base = &cmd->pad_bytes;
2813 iov[niov++].iov_len = padding;
2815 pr_debug("Attaching %u additional"
2816 " padding bytes.\n", padding);
2818 if (conn->conn_ops->DataDigest) {
2819 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2820 cmd->buf_ptr, cmd->buf_ptr_size,
2821 padding, (u8 *)&cmd->pad_bytes,
2822 (u8 *)&cmd->data_crc);
2824 iov[niov].iov_base = &cmd->data_crc;
2825 iov[niov++].iov_len = ISCSI_CRC_LEN;
2826 tx_size += ISCSI_CRC_LEN;
2827 pr_debug("Attached DataDigest for %u"
2828 " bytes of ping data, CRC 0x%08x\n",
2829 cmd->buf_ptr_size, cmd->data_crc);
2833 cmd->iov_misc_count = niov;
2834 cmd->tx_size = tx_size;
2836 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2837 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2838 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2843 int iscsit_send_r2t(
2844 struct iscsi_cmd *cmd,
2845 struct iscsi_conn *conn)
2848 struct iscsi_r2t *r2t;
2849 struct iscsi_r2t_rsp *hdr;
2851 r2t = iscsit_get_r2t_from_list(cmd);
2855 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2856 memset(hdr, 0, ISCSI_HDR_LEN);
2857 hdr->opcode = ISCSI_OP_R2T;
2858 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2859 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2860 (struct scsi_lun *)&hdr->lun);
2861 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2862 spin_lock_bh(&conn->sess->ttt_lock);
2863 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2864 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2865 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2866 spin_unlock_bh(&conn->sess->ttt_lock);
2867 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2868 hdr->statsn = cpu_to_be32(conn->stat_sn);
2869 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2870 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2871 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2872 hdr->data_offset = cpu_to_be32(r2t->offset);
2873 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2875 cmd->iov_misc[0].iov_base = cmd->pdu;
2876 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2877 tx_size += ISCSI_HDR_LEN;
2879 if (conn->conn_ops->HeaderDigest) {
2880 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2882 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2883 (unsigned char *)hdr, ISCSI_HDR_LEN,
2884 0, NULL, (u8 *)header_digest);
2886 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2887 tx_size += ISCSI_CRC_LEN;
2888 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2889 " PDU 0x%08x\n", *header_digest);
2892 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2893 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2894 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2895 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2896 r2t->offset, r2t->xfer_len, conn->cid);
2898 cmd->iov_misc_count = 1;
2899 cmd->tx_size = tx_size;
2901 spin_lock_bh(&cmd->r2t_lock);
2903 spin_unlock_bh(&cmd->r2t_lock);
2909 * type 0: Normal Operation.
2910 * type 1: Called from Storage Transport.
2911 * type 2: Called from iscsi_task_reassign_complete_write() for
2912 * connection recovery.
2914 int iscsit_build_r2ts_for_cmd(
2915 struct iscsi_cmd *cmd,
2916 struct iscsi_conn *conn,
2920 u32 offset = 0, xfer_len = 0;
2922 spin_lock_bh(&cmd->r2t_lock);
2923 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2924 spin_unlock_bh(&cmd->r2t_lock);
2928 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2929 if (cmd->r2t_offset < cmd->write_data_done)
2930 cmd->r2t_offset = cmd->write_data_done;
2932 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2933 if (conn->sess->sess_ops->DataSequenceInOrder) {
2934 offset = cmd->r2t_offset;
2936 if (first_r2t && (type == 2)) {
2937 xfer_len = ((offset +
2938 (conn->sess->sess_ops->MaxBurstLength -
2939 cmd->next_burst_len) >
2941 (cmd->data_length - offset) :
2942 (conn->sess->sess_ops->MaxBurstLength -
2943 cmd->next_burst_len));
2945 xfer_len = ((offset +
2946 conn->sess->sess_ops->MaxBurstLength) >
2948 (cmd->data_length - offset) :
2949 conn->sess->sess_ops->MaxBurstLength;
2951 cmd->r2t_offset += xfer_len;
2953 if (cmd->r2t_offset == cmd->data_length)
2954 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2956 struct iscsi_seq *seq;
2958 seq = iscsit_get_seq_holder_for_r2t(cmd);
2960 spin_unlock_bh(&cmd->r2t_lock);
2964 offset = seq->offset;
2965 xfer_len = seq->xfer_len;
2967 if (cmd->seq_send_order == cmd->seq_count)
2968 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2970 cmd->outstanding_r2ts++;
2973 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2974 spin_unlock_bh(&cmd->r2t_lock);
2978 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2981 spin_unlock_bh(&cmd->r2t_lock);
2986 static int iscsit_send_status(
2987 struct iscsi_cmd *cmd,
2988 struct iscsi_conn *conn)
2990 u8 iov_count = 0, recovery;
2991 u32 padding = 0, tx_size = 0;
2992 struct iscsi_scsi_rsp *hdr;
2995 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
2997 cmd->stat_sn = conn->stat_sn++;
2999 spin_lock_bh(&conn->sess->session_stats_lock);
3000 conn->sess->rsp_pdus++;
3001 spin_unlock_bh(&conn->sess->session_stats_lock);
3003 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3004 memset(hdr, 0, ISCSI_HDR_LEN);
3005 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3006 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3007 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3008 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3009 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3010 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3011 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3012 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3014 hdr->response = cmd->iscsi_response;
3015 hdr->cmd_status = cmd->se_cmd.scsi_status;
3016 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3017 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3019 iscsit_increment_maxcmdsn(cmd, conn->sess);
3020 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3021 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3023 iov = &cmd->iov_misc[0];
3024 iov[iov_count].iov_base = cmd->pdu;
3025 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3026 tx_size += ISCSI_HDR_LEN;
3029 * Attach SENSE DATA payload to iSCSI Response PDU
3031 if (cmd->se_cmd.sense_buffer &&
3032 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3033 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3034 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3035 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3036 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3037 iov[iov_count++].iov_len =
3038 (cmd->se_cmd.scsi_sense_length + padding);
3039 tx_size += cmd->se_cmd.scsi_sense_length;
3042 memset(cmd->se_cmd.sense_buffer +
3043 cmd->se_cmd.scsi_sense_length, 0, padding);
3045 pr_debug("Adding %u bytes of padding to"
3046 " SENSE.\n", padding);
3049 if (conn->conn_ops->DataDigest) {
3050 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3051 cmd->se_cmd.sense_buffer,
3052 (cmd->se_cmd.scsi_sense_length + padding),
3053 0, NULL, (u8 *)&cmd->data_crc);
3055 iov[iov_count].iov_base = &cmd->data_crc;
3056 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3057 tx_size += ISCSI_CRC_LEN;
3059 pr_debug("Attaching CRC32 DataDigest for"
3060 " SENSE, %u bytes CRC 0x%08x\n",
3061 (cmd->se_cmd.scsi_sense_length + padding),
3065 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3067 cmd->se_cmd.scsi_sense_length);
3070 if (conn->conn_ops->HeaderDigest) {
3071 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3073 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3074 (unsigned char *)hdr, ISCSI_HDR_LEN,
3075 0, NULL, (u8 *)header_digest);
3077 iov[0].iov_len += ISCSI_CRC_LEN;
3078 tx_size += ISCSI_CRC_LEN;
3079 pr_debug("Attaching CRC32 HeaderDigest for Response"
3080 " PDU 0x%08x\n", *header_digest);
3083 cmd->iov_misc_count = iov_count;
3084 cmd->tx_size = tx_size;
3086 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3087 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3088 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3089 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3094 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3096 switch (se_tmr->response) {
3097 case TMR_FUNCTION_COMPLETE:
3098 return ISCSI_TMF_RSP_COMPLETE;
3099 case TMR_TASK_DOES_NOT_EXIST:
3100 return ISCSI_TMF_RSP_NO_TASK;
3101 case TMR_LUN_DOES_NOT_EXIST:
3102 return ISCSI_TMF_RSP_NO_LUN;
3103 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3104 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3105 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3106 return ISCSI_TMF_RSP_AUTH_FAILED;
3107 case TMR_FUNCTION_REJECTED:
3109 return ISCSI_TMF_RSP_REJECTED;
3113 static int iscsit_send_task_mgt_rsp(
3114 struct iscsi_cmd *cmd,
3115 struct iscsi_conn *conn)
3117 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3118 struct iscsi_tm_rsp *hdr;
3121 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3122 memset(hdr, 0, ISCSI_HDR_LEN);
3123 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3124 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3125 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3126 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3127 cmd->stat_sn = conn->stat_sn++;
3128 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3130 iscsit_increment_maxcmdsn(cmd, conn->sess);
3131 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3132 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3134 cmd->iov_misc[0].iov_base = cmd->pdu;
3135 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3136 tx_size += ISCSI_HDR_LEN;
3138 if (conn->conn_ops->HeaderDigest) {
3139 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3141 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3142 (unsigned char *)hdr, ISCSI_HDR_LEN,
3143 0, NULL, (u8 *)header_digest);
3145 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3146 tx_size += ISCSI_CRC_LEN;
3147 pr_debug("Attaching CRC32 HeaderDigest for Task"
3148 " Mgmt Response PDU 0x%08x\n", *header_digest);
3151 cmd->iov_misc_count = 1;
3152 cmd->tx_size = tx_size;
3154 pr_debug("Built Task Management Response ITT: 0x%08x,"
3155 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3156 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3161 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3165 if (np->np_sockaddr.ss_family == AF_INET6) {
3166 const struct sockaddr_in6 sin6 = {
3167 .sin6_addr = IN6ADDR_ANY_INIT };
3168 struct sockaddr_in6 *sock_in6 =
3169 (struct sockaddr_in6 *)&np->np_sockaddr;
3171 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3172 sin6.sin6_addr.s6_addr, 16))
3175 struct sockaddr_in * sock_in =
3176 (struct sockaddr_in *)&np->np_sockaddr;
3178 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3185 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3187 char *payload = NULL;
3188 struct iscsi_conn *conn = cmd->conn;
3189 struct iscsi_portal_group *tpg;
3190 struct iscsi_tiqn *tiqn;
3191 struct iscsi_tpg_np *tpg_np;
3192 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3193 unsigned char buf[256];
3195 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3196 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3198 memset(buf, 0, 256);
3200 payload = kzalloc(buffer_len, GFP_KERNEL);
3202 pr_err("Unable to allocate memory for sendtargets"
3207 spin_lock(&tiqn_lock);
3208 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3209 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3212 if ((len + payload_len) > buffer_len) {
3216 memcpy((void *)payload + payload_len, buf, len);
3219 spin_lock(&tiqn->tiqn_tpg_lock);
3220 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3222 spin_lock(&tpg->tpg_state_lock);
3223 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3224 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3225 spin_unlock(&tpg->tpg_state_lock);
3228 spin_unlock(&tpg->tpg_state_lock);
3230 spin_lock(&tpg->tpg_np_lock);
3231 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3233 struct iscsi_np *np = tpg_np->tpg_np;
3234 bool inaddr_any = iscsit_check_inaddr_any(np);
3236 len = sprintf(buf, "TargetAddress="
3238 (np->np_sockaddr.ss_family == AF_INET6) ?
3239 "[" : "", (inaddr_any == false) ?
3240 np->np_ip : conn->local_ip,
3241 (np->np_sockaddr.ss_family == AF_INET6) ?
3242 "]" : "", (inaddr_any == false) ?
3243 np->np_port : conn->local_port,
3247 if ((len + payload_len) > buffer_len) {
3248 spin_unlock(&tpg->tpg_np_lock);
3249 spin_unlock(&tiqn->tiqn_tpg_lock);
3253 memcpy((void *)payload + payload_len, buf, len);
3256 spin_unlock(&tpg->tpg_np_lock);
3258 spin_unlock(&tiqn->tiqn_tpg_lock);
3263 spin_unlock(&tiqn_lock);
3265 cmd->buf_ptr = payload;
3271 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3272 * MaxRecvDataSegmentLength.
3274 static int iscsit_send_text_rsp(
3275 struct iscsi_cmd *cmd,
3276 struct iscsi_conn *conn)
3278 struct iscsi_text_rsp *hdr;
3280 u32 padding = 0, tx_size = 0;
3281 int text_length, iov_count = 0;
3283 text_length = iscsit_build_sendtargets_response(cmd);
3284 if (text_length < 0)
3287 padding = ((-text_length) & 3);
3289 memset(cmd->buf_ptr + text_length, 0, padding);
3290 pr_debug("Attaching %u additional bytes for"
3291 " padding.\n", padding);
3294 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3295 memset(hdr, 0, ISCSI_HDR_LEN);
3296 hdr->opcode = ISCSI_OP_TEXT_RSP;
3297 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3298 hton24(hdr->dlength, text_length);
3299 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3300 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3301 cmd->stat_sn = conn->stat_sn++;
3302 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3304 iscsit_increment_maxcmdsn(cmd, conn->sess);
3305 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3306 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3308 iov = &cmd->iov_misc[0];
3310 iov[iov_count].iov_base = cmd->pdu;
3311 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3312 iov[iov_count].iov_base = cmd->buf_ptr;
3313 iov[iov_count++].iov_len = text_length + padding;
3315 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3317 if (conn->conn_ops->HeaderDigest) {
3318 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3320 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3321 (unsigned char *)hdr, ISCSI_HDR_LEN,
3322 0, NULL, (u8 *)header_digest);
3324 iov[0].iov_len += ISCSI_CRC_LEN;
3325 tx_size += ISCSI_CRC_LEN;
3326 pr_debug("Attaching CRC32 HeaderDigest for"
3327 " Text Response PDU 0x%08x\n", *header_digest);
3330 if (conn->conn_ops->DataDigest) {
3331 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3332 cmd->buf_ptr, (text_length + padding),
3333 0, NULL, (u8 *)&cmd->data_crc);
3335 iov[iov_count].iov_base = &cmd->data_crc;
3336 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3337 tx_size += ISCSI_CRC_LEN;
3339 pr_debug("Attaching DataDigest for %u bytes of text"
3340 " data, CRC 0x%08x\n", (text_length + padding),
3344 cmd->iov_misc_count = iov_count;
3345 cmd->tx_size = tx_size;
3347 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3348 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3349 text_length, conn->cid);
3353 static int iscsit_send_reject(
3354 struct iscsi_cmd *cmd,
3355 struct iscsi_conn *conn)
3357 u32 iov_count = 0, tx_size = 0;
3358 struct iscsi_reject *hdr;
3361 hdr = (struct iscsi_reject *) cmd->pdu;
3362 hdr->opcode = ISCSI_OP_REJECT;
3363 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3364 hton24(hdr->dlength, ISCSI_HDR_LEN);
3365 hdr->ffffffff = 0xffffffff;
3366 cmd->stat_sn = conn->stat_sn++;
3367 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3368 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3369 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3371 iov = &cmd->iov_misc[0];
3373 iov[iov_count].iov_base = cmd->pdu;
3374 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3375 iov[iov_count].iov_base = cmd->buf_ptr;
3376 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3378 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3380 if (conn->conn_ops->HeaderDigest) {
3381 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3383 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3384 (unsigned char *)hdr, ISCSI_HDR_LEN,
3385 0, NULL, (u8 *)header_digest);
3387 iov[0].iov_len += ISCSI_CRC_LEN;
3388 tx_size += ISCSI_CRC_LEN;
3389 pr_debug("Attaching CRC32 HeaderDigest for"
3390 " REJECT PDU 0x%08x\n", *header_digest);
3393 if (conn->conn_ops->DataDigest) {
3394 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3395 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3396 0, NULL, (u8 *)&cmd->data_crc);
3398 iov[iov_count].iov_base = &cmd->data_crc;
3399 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3400 tx_size += ISCSI_CRC_LEN;
3401 pr_debug("Attaching CRC32 DataDigest for REJECT"
3402 " PDU 0x%08x\n", cmd->data_crc);
3405 cmd->iov_misc_count = iov_count;
3406 cmd->tx_size = tx_size;
3408 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3409 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3414 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3416 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3417 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3418 wait_for_completion_interruptible_timeout(
3419 &conn->tx_half_close_comp,
3420 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3426 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3428 struct iscsi_thread_set *ts = conn->thread_set;
3431 * thread_id is assigned from iscsit_global->ts_bitmap from
3432 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3434 * Here we use thread_id to determine which CPU that this
3435 * iSCSI connection's iscsi_thread_set will be scheduled to
3438 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3440 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3441 " thread_id: %d\n", ord, ts->thread_id);
3443 for_each_online_cpu(cpu) {
3445 cpumask_set_cpu(cpu, conn->conn_cpumask);
3450 * This should never be reached..
3453 cpumask_setall(conn->conn_cpumask);
3456 static inline void iscsit_thread_check_cpumask(
3457 struct iscsi_conn *conn,
3458 struct task_struct *p,
3463 * mode == 1 signals iscsi_target_tx_thread() usage.
3464 * mode == 0 signals iscsi_target_rx_thread() usage.
3467 if (!conn->conn_tx_reset_cpumask)
3469 conn->conn_tx_reset_cpumask = 0;
3471 if (!conn->conn_rx_reset_cpumask)
3473 conn->conn_rx_reset_cpumask = 0;
3476 * Update the CPU mask for this single kthread so that
3477 * both TX and RX kthreads are scheduled to run on the
3480 memset(buf, 0, 128);
3481 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3483 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3484 " %s for %s\n", buf, p->comm);
3486 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3491 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3496 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3497 #endif /* CONFIG_SMP */
3499 int iscsi_target_tx_thread(void *arg)
3504 int sent_status = 0;
3507 struct iscsi_cmd *cmd = NULL;
3508 struct iscsi_conn *conn;
3509 struct iscsi_queue_req *qr = NULL;
3510 struct se_cmd *se_cmd;
3511 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3513 * Allow ourselves to be interrupted by SIGINT so that a
3514 * connection recovery / failure event can be triggered externally.
3516 allow_signal(SIGINT);
3519 conn = iscsi_tx_thread_pre_handler(ts);
3523 eodr = map_sg = ret = sent_status = use_misc = 0;
3525 while (!kthread_should_stop()) {
3527 * Ensure that both TX and RX per connection kthreads
3528 * are scheduled to run on the same CPU.
3530 iscsit_thread_check_cpumask(conn, current, 1);
3532 wait_event_interruptible(conn->queues_wq,
3533 !iscsit_conn_all_queues_empty(conn) ||
3534 ts->status == ISCSI_THREAD_SET_RESET);
3536 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3537 signal_pending(current))
3541 qr = iscsit_get_cmd_from_immediate_queue(conn);
3543 atomic_set(&conn->check_immediate_queue, 0);
3546 kmem_cache_free(lio_qr_cache, qr);
3548 spin_lock_bh(&cmd->istate_lock);
3550 case ISTATE_SEND_R2T:
3551 spin_unlock_bh(&cmd->istate_lock);
3552 ret = iscsit_send_r2t(cmd, conn);
3555 spin_unlock_bh(&cmd->istate_lock);
3557 if (cmd->data_direction == DMA_TO_DEVICE)
3558 iscsit_stop_dataout_timer(cmd);
3560 spin_lock_bh(&conn->cmd_lock);
3561 list_del(&cmd->i_list);
3562 spin_unlock_bh(&conn->cmd_lock);
3564 iscsit_free_cmd(cmd);
3566 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3567 spin_unlock_bh(&cmd->istate_lock);
3568 iscsit_mod_nopin_response_timer(conn);
3569 ret = iscsit_send_unsolicited_nopin(cmd,
3572 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3573 spin_unlock_bh(&cmd->istate_lock);
3574 ret = iscsit_send_unsolicited_nopin(cmd,
3578 pr_err("Unknown Opcode: 0x%02x ITT:"
3579 " 0x%08x, i_state: %d on CID: %hu\n",
3580 cmd->iscsi_opcode, cmd->init_task_tag, state,
3582 spin_unlock_bh(&cmd->istate_lock);
3586 conn->tx_immediate_queue = 0;
3590 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3591 conn->tx_immediate_queue = 0;
3592 iscsit_tx_thread_wait_for_tcp(conn);
3596 spin_lock_bh(&cmd->istate_lock);
3598 case ISTATE_SEND_R2T:
3599 spin_unlock_bh(&cmd->istate_lock);
3600 spin_lock_bh(&cmd->dataout_timeout_lock);
3601 iscsit_start_dataout_timer(cmd, conn);
3602 spin_unlock_bh(&cmd->dataout_timeout_lock);
3604 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3605 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3606 spin_unlock_bh(&cmd->istate_lock);
3608 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3609 cmd->i_state = ISTATE_SENT_STATUS;
3610 spin_unlock_bh(&cmd->istate_lock);
3613 pr_err("Unknown Opcode: 0x%02x ITT:"
3614 " 0x%08x, i_state: %d on CID: %hu\n",
3615 cmd->iscsi_opcode, cmd->init_task_tag,
3617 spin_unlock_bh(&cmd->istate_lock);
3622 conn->tx_immediate_queue = 0;
3625 qr = iscsit_get_cmd_from_response_queue(conn);
3629 kmem_cache_free(lio_qr_cache, qr);
3631 spin_lock_bh(&cmd->istate_lock);
3634 case ISTATE_SEND_DATAIN:
3635 spin_unlock_bh(&cmd->istate_lock);
3636 ret = iscsit_send_data_in(cmd, conn,
3640 case ISTATE_SEND_STATUS:
3641 case ISTATE_SEND_STATUS_RECOVERY:
3642 spin_unlock_bh(&cmd->istate_lock);
3644 ret = iscsit_send_status(cmd, conn);
3646 case ISTATE_SEND_LOGOUTRSP:
3647 spin_unlock_bh(&cmd->istate_lock);
3649 ret = iscsit_send_logout_response(cmd, conn);
3651 case ISTATE_SEND_ASYNCMSG:
3652 spin_unlock_bh(&cmd->istate_lock);
3654 ret = iscsit_send_conn_drop_async_message(
3657 case ISTATE_SEND_NOPIN:
3658 spin_unlock_bh(&cmd->istate_lock);
3660 ret = iscsit_send_nopin_response(cmd, conn);
3662 case ISTATE_SEND_REJECT:
3663 spin_unlock_bh(&cmd->istate_lock);
3665 ret = iscsit_send_reject(cmd, conn);
3667 case ISTATE_SEND_TASKMGTRSP:
3668 spin_unlock_bh(&cmd->istate_lock);
3670 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3673 ret = iscsit_tmr_post_handler(cmd, conn);
3675 iscsit_fall_back_to_erl0(conn->sess);
3677 case ISTATE_SEND_TEXTRSP:
3678 spin_unlock_bh(&cmd->istate_lock);
3680 ret = iscsit_send_text_rsp(cmd, conn);
3683 pr_err("Unknown Opcode: 0x%02x ITT:"
3684 " 0x%08x, i_state: %d on CID: %hu\n",
3685 cmd->iscsi_opcode, cmd->init_task_tag,
3687 spin_unlock_bh(&cmd->istate_lock);
3691 conn->tx_response_queue = 0;
3695 se_cmd = &cmd->se_cmd;
3697 if (map_sg && !conn->conn_ops->IFMarker) {
3698 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3699 conn->tx_response_queue = 0;
3700 iscsit_tx_thread_wait_for_tcp(conn);
3701 iscsit_unmap_iovec(cmd);
3705 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3706 conn->tx_response_queue = 0;
3707 iscsit_tx_thread_wait_for_tcp(conn);
3708 iscsit_unmap_iovec(cmd);
3713 iscsit_unmap_iovec(cmd);
3715 spin_lock_bh(&cmd->istate_lock);
3717 case ISTATE_SEND_DATAIN:
3719 goto check_rsp_state;
3722 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3724 eodr = use_misc = 0;
3725 } else if (eodr == 2) {
3726 cmd->i_state = state =
3729 eodr = use_misc = 0;
3730 goto check_rsp_state;
3733 case ISTATE_SEND_STATUS:
3737 case ISTATE_SEND_ASYNCMSG:
3738 case ISTATE_SEND_NOPIN:
3739 case ISTATE_SEND_STATUS_RECOVERY:
3740 case ISTATE_SEND_TEXTRSP:
3744 case ISTATE_SEND_REJECT:
3746 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3747 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3748 spin_unlock_bh(&cmd->istate_lock);
3749 complete(&cmd->reject_comp);
3752 complete(&cmd->reject_comp);
3754 case ISTATE_SEND_TASKMGTRSP:
3758 case ISTATE_SEND_LOGOUTRSP:
3759 spin_unlock_bh(&cmd->istate_lock);
3760 if (!iscsit_logout_post_handler(cmd, conn))
3762 spin_lock_bh(&cmd->istate_lock);
3767 pr_err("Unknown Opcode: 0x%02x ITT:"
3768 " 0x%08x, i_state: %d on CID: %hu\n",
3769 cmd->iscsi_opcode, cmd->init_task_tag,
3770 cmd->i_state, conn->cid);
3771 spin_unlock_bh(&cmd->istate_lock);
3776 cmd->i_state = ISTATE_SENT_STATUS;
3779 spin_unlock_bh(&cmd->istate_lock);
3781 if (atomic_read(&conn->check_immediate_queue))
3786 conn->tx_response_queue = 0;
3790 iscsit_take_action_for_connection_exit(conn);
3796 int iscsi_target_rx_thread(void *arg)
3799 u8 buffer[ISCSI_HDR_LEN], opcode;
3800 u32 checksum = 0, digest = 0;
3801 struct iscsi_conn *conn = NULL;
3802 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3805 * Allow ourselves to be interrupted by SIGINT so that a
3806 * connection recovery / failure event can be triggered externally.
3808 allow_signal(SIGINT);
3811 conn = iscsi_rx_thread_pre_handler(ts);
3815 while (!kthread_should_stop()) {
3817 * Ensure that both TX and RX per connection kthreads
3818 * are scheduled to run on the same CPU.
3820 iscsit_thread_check_cpumask(conn, current, 0);
3822 memset(buffer, 0, ISCSI_HDR_LEN);
3823 memset(&iov, 0, sizeof(struct kvec));
3825 iov.iov_base = buffer;
3826 iov.iov_len = ISCSI_HDR_LEN;
3828 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3829 if (ret != ISCSI_HDR_LEN) {
3830 iscsit_rx_thread_wait_for_tcp(conn);
3835 * Set conn->bad_hdr for use with REJECT PDUs.
3837 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3839 if (conn->conn_ops->HeaderDigest) {
3840 iov.iov_base = &digest;
3841 iov.iov_len = ISCSI_CRC_LEN;
3843 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3844 if (ret != ISCSI_CRC_LEN) {
3845 iscsit_rx_thread_wait_for_tcp(conn);
3849 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3850 buffer, ISCSI_HDR_LEN,
3851 0, NULL, (u8 *)&checksum);
3853 if (digest != checksum) {
3854 pr_err("HeaderDigest CRC32C failed,"
3855 " received 0x%08x, computed 0x%08x\n",
3858 * Set the PDU to 0xff so it will intentionally
3859 * hit default in the switch below.
3861 memset(buffer, 0xff, ISCSI_HDR_LEN);
3862 spin_lock_bh(&conn->sess->session_stats_lock);
3863 conn->sess->conn_digest_errors++;
3864 spin_unlock_bh(&conn->sess->session_stats_lock);
3866 pr_debug("Got HeaderDigest CRC32C"
3867 " 0x%08x\n", checksum);
3871 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3874 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3876 if (conn->sess->sess_ops->SessionType &&
3877 ((!(opcode & ISCSI_OP_TEXT)) ||
3878 (!(opcode & ISCSI_OP_LOGOUT)))) {
3879 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3880 " while in Discovery Session, rejecting.\n", opcode);
3881 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3887 case ISCSI_OP_SCSI_CMD:
3888 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3891 case ISCSI_OP_SCSI_DATA_OUT:
3892 if (iscsit_handle_data_out(conn, buffer) < 0)
3895 case ISCSI_OP_NOOP_OUT:
3896 if (iscsit_handle_nop_out(conn, buffer) < 0)
3899 case ISCSI_OP_SCSI_TMFUNC:
3900 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3904 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3907 case ISCSI_OP_LOGOUT:
3908 ret = iscsit_handle_logout_cmd(conn, buffer);
3910 wait_for_completion_timeout(&conn->conn_logout_comp,
3911 SECONDS_FOR_LOGOUT_COMP * HZ);
3916 case ISCSI_OP_SNACK:
3917 if (iscsit_handle_snack(conn, buffer) < 0)
3921 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3923 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3924 pr_err("Cannot recover from unknown"
3925 " opcode while ERL=0, closing iSCSI connection"
3929 if (!conn->conn_ops->OFMarker) {
3930 pr_err("Unable to recover from unknown"
3931 " opcode while OFMarker=No, closing iSCSI"
3935 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3936 pr_err("Unable to recover from unknown"
3937 " opcode, closing iSCSI connection.\n");
3945 if (!signal_pending(current))
3946 atomic_set(&conn->transport_failed, 1);
3947 iscsit_take_action_for_connection_exit(conn);
3953 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3955 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3956 struct iscsi_session *sess = conn->sess;
3958 * We expect this function to only ever be called from either RX or TX
3959 * thread context via iscsit_close_connection() once the other context
3960 * has been reset -> returned sleeping pre-handler state.
3962 spin_lock_bh(&conn->cmd_lock);
3963 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3965 list_del(&cmd->i_list);
3966 spin_unlock_bh(&conn->cmd_lock);
3968 iscsit_increment_maxcmdsn(cmd, sess);
3970 iscsit_free_cmd(cmd);
3972 spin_lock_bh(&conn->cmd_lock);
3974 spin_unlock_bh(&conn->cmd_lock);
3977 static void iscsit_stop_timers_for_cmds(
3978 struct iscsi_conn *conn)
3980 struct iscsi_cmd *cmd;
3982 spin_lock_bh(&conn->cmd_lock);
3983 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3984 if (cmd->data_direction == DMA_TO_DEVICE)
3985 iscsit_stop_dataout_timer(cmd);
3987 spin_unlock_bh(&conn->cmd_lock);
3990 int iscsit_close_connection(
3991 struct iscsi_conn *conn)
3993 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3994 struct iscsi_session *sess = conn->sess;
3996 pr_debug("Closing iSCSI connection CID %hu on SID:"
3997 " %u\n", conn->cid, sess->sid);
3999 * Always up conn_logout_comp just in case the RX Thread is sleeping
4000 * and the logout response never got sent because the connection
4003 complete(&conn->conn_logout_comp);
4005 iscsi_release_thread_set(conn);
4007 iscsit_stop_timers_for_cmds(conn);
4008 iscsit_stop_nopin_response_timer(conn);
4009 iscsit_stop_nopin_timer(conn);
4010 iscsit_free_queue_reqs_for_conn(conn);
4013 * During Connection recovery drop unacknowledged out of order
4014 * commands for this connection, and prepare the other commands
4017 * During normal operation clear the out of order commands (but
4018 * do not free the struct iscsi_ooo_cmdsn's) and release all
4019 * struct iscsi_cmds.
4021 if (atomic_read(&conn->connection_recovery)) {
4022 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4023 iscsit_prepare_cmds_for_realligance(conn);
4025 iscsit_clear_ooo_cmdsns_for_conn(conn);
4026 iscsit_release_commands_from_conn(conn);
4030 * Handle decrementing session or connection usage count if
4031 * a logout response was not able to be sent because the
4032 * connection failed. Fall back to Session Recovery here.
4034 if (atomic_read(&conn->conn_logout_remove)) {
4035 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4036 iscsit_dec_conn_usage_count(conn);
4037 iscsit_dec_session_usage_count(sess);
4039 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4040 iscsit_dec_conn_usage_count(conn);
4042 atomic_set(&conn->conn_logout_remove, 0);
4043 atomic_set(&sess->session_reinstatement, 0);
4044 atomic_set(&sess->session_fall_back_to_erl0, 1);
4047 spin_lock_bh(&sess->conn_lock);
4048 list_del(&conn->conn_list);
4051 * Attempt to let the Initiator know this connection failed by
4052 * sending an Connection Dropped Async Message on another
4053 * active connection.
4055 if (atomic_read(&conn->connection_recovery))
4056 iscsit_build_conn_drop_async_message(conn);
4058 spin_unlock_bh(&sess->conn_lock);
4061 * If connection reinstatement is being performed on this connection,
4062 * up the connection reinstatement semaphore that is being blocked on
4063 * in iscsit_cause_connection_reinstatement().
4065 spin_lock_bh(&conn->state_lock);
4066 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4067 spin_unlock_bh(&conn->state_lock);
4068 complete(&conn->conn_wait_comp);
4069 wait_for_completion(&conn->conn_post_wait_comp);
4070 spin_lock_bh(&conn->state_lock);
4074 * If connection reinstatement is being performed on this connection
4075 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4076 * connection wait rcfr semaphore that is being blocked on
4077 * an iscsit_connection_reinstatement_rcfr().
4079 if (atomic_read(&conn->connection_wait_rcfr)) {
4080 spin_unlock_bh(&conn->state_lock);
4081 complete(&conn->conn_wait_rcfr_comp);
4082 wait_for_completion(&conn->conn_post_wait_comp);
4083 spin_lock_bh(&conn->state_lock);
4085 atomic_set(&conn->connection_reinstatement, 1);
4086 spin_unlock_bh(&conn->state_lock);
4089 * If any other processes are accessing this connection pointer we
4090 * must wait until they have completed.
4092 iscsit_check_conn_usage_count(conn);
4094 if (conn->conn_rx_hash.tfm)
4095 crypto_free_hash(conn->conn_rx_hash.tfm);
4096 if (conn->conn_tx_hash.tfm)
4097 crypto_free_hash(conn->conn_tx_hash.tfm);
4099 if (conn->conn_cpumask)
4100 free_cpumask_var(conn->conn_cpumask);
4102 kfree(conn->conn_ops);
4103 conn->conn_ops = NULL;
4106 sock_release(conn->sock);
4107 conn->thread_set = NULL;
4109 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4110 conn->conn_state = TARG_CONN_STATE_FREE;
4113 spin_lock_bh(&sess->conn_lock);
4114 atomic_dec(&sess->nconn);
4115 pr_debug("Decremented iSCSI connection count to %hu from node:"
4116 " %s\n", atomic_read(&sess->nconn),
4117 sess->sess_ops->InitiatorName);
4119 * Make sure that if one connection fails in an non ERL=2 iSCSI
4120 * Session that they all fail.
4122 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4123 !atomic_read(&sess->session_logout))
4124 atomic_set(&sess->session_fall_back_to_erl0, 1);
4127 * If this was not the last connection in the session, and we are
4128 * performing session reinstatement or falling back to ERL=0, call
4129 * iscsit_stop_session() without sleeping to shutdown the other
4130 * active connections.
4132 if (atomic_read(&sess->nconn)) {
4133 if (!atomic_read(&sess->session_reinstatement) &&
4134 !atomic_read(&sess->session_fall_back_to_erl0)) {
4135 spin_unlock_bh(&sess->conn_lock);
4138 if (!atomic_read(&sess->session_stop_active)) {
4139 atomic_set(&sess->session_stop_active, 1);
4140 spin_unlock_bh(&sess->conn_lock);
4141 iscsit_stop_session(sess, 0, 0);
4144 spin_unlock_bh(&sess->conn_lock);
4149 * If this was the last connection in the session and one of the
4150 * following is occurring:
4152 * Session Reinstatement is not being performed, and are falling back
4153 * to ERL=0 call iscsit_close_session().
4155 * Session Logout was requested. iscsit_close_session() will be called
4158 * Session Continuation is not being performed, start the Time2Retain
4159 * handler and check if sleep_on_sess_wait_sem is active.
4161 if (!atomic_read(&sess->session_reinstatement) &&
4162 atomic_read(&sess->session_fall_back_to_erl0)) {
4163 spin_unlock_bh(&sess->conn_lock);
4164 iscsit_close_session(sess);
4167 } else if (atomic_read(&sess->session_logout)) {
4168 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4169 sess->session_state = TARG_SESS_STATE_FREE;
4170 spin_unlock_bh(&sess->conn_lock);
4172 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4173 complete(&sess->session_wait_comp);
4177 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4178 sess->session_state = TARG_SESS_STATE_FAILED;
4180 if (!atomic_read(&sess->session_continuation)) {
4181 spin_unlock_bh(&sess->conn_lock);
4182 iscsit_start_time2retain_handler(sess);
4184 spin_unlock_bh(&sess->conn_lock);
4186 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4187 complete(&sess->session_wait_comp);
4191 spin_unlock_bh(&sess->conn_lock);
4196 int iscsit_close_session(struct iscsi_session *sess)
4198 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4199 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4201 if (atomic_read(&sess->nconn)) {
4202 pr_err("%d connection(s) still exist for iSCSI session"
4203 " to %s\n", atomic_read(&sess->nconn),
4204 sess->sess_ops->InitiatorName);
4208 spin_lock_bh(&se_tpg->session_lock);
4209 atomic_set(&sess->session_logout, 1);
4210 atomic_set(&sess->session_reinstatement, 1);
4211 iscsit_stop_time2retain_timer(sess);
4212 spin_unlock_bh(&se_tpg->session_lock);
4215 * transport_deregister_session_configfs() will clear the
4216 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4217 * can be setting it again with __transport_register_session() in
4218 * iscsi_post_login_handler() again after the iscsit_stop_session()
4219 * completes in iscsi_np context.
4221 transport_deregister_session_configfs(sess->se_sess);
4224 * If any other processes are accessing this session pointer we must
4225 * wait until they have completed. If we are in an interrupt (the
4226 * time2retain handler) and contain and active session usage count we
4227 * restart the timer and exit.
4229 if (!in_interrupt()) {
4230 if (iscsit_check_session_usage_count(sess) == 1)
4231 iscsit_stop_session(sess, 1, 1);
4233 if (iscsit_check_session_usage_count(sess) == 2) {
4234 atomic_set(&sess->session_logout, 0);
4235 iscsit_start_time2retain_handler(sess);
4240 transport_deregister_session(sess->se_sess);
4242 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4243 iscsit_free_connection_recovery_entires(sess);
4245 iscsit_free_all_ooo_cmdsns(sess);
4247 spin_lock_bh(&se_tpg->session_lock);
4248 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4249 sess->session_state = TARG_SESS_STATE_FREE;
4250 pr_debug("Released iSCSI session from node: %s\n",
4251 sess->sess_ops->InitiatorName);
4254 tpg->tpg_tiqn->tiqn_nsessions--;
4256 pr_debug("Decremented number of active iSCSI Sessions on"
4257 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4259 spin_lock(&sess_idr_lock);
4260 idr_remove(&sess_idr, sess->session_index);
4261 spin_unlock(&sess_idr_lock);
4263 kfree(sess->sess_ops);
4264 sess->sess_ops = NULL;
4265 spin_unlock_bh(&se_tpg->session_lock);
4271 static void iscsit_logout_post_handler_closesession(
4272 struct iscsi_conn *conn)
4274 struct iscsi_session *sess = conn->sess;
4276 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4277 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4279 atomic_set(&conn->conn_logout_remove, 0);
4280 complete(&conn->conn_logout_comp);
4282 iscsit_dec_conn_usage_count(conn);
4283 iscsit_stop_session(sess, 1, 1);
4284 iscsit_dec_session_usage_count(sess);
4285 iscsit_close_session(sess);
4288 static void iscsit_logout_post_handler_samecid(
4289 struct iscsi_conn *conn)
4291 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4292 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4294 atomic_set(&conn->conn_logout_remove, 0);
4295 complete(&conn->conn_logout_comp);
4297 iscsit_cause_connection_reinstatement(conn, 1);
4298 iscsit_dec_conn_usage_count(conn);
4301 static void iscsit_logout_post_handler_diffcid(
4302 struct iscsi_conn *conn,
4305 struct iscsi_conn *l_conn;
4306 struct iscsi_session *sess = conn->sess;
4311 spin_lock_bh(&sess->conn_lock);
4312 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4313 if (l_conn->cid == cid) {
4314 iscsit_inc_conn_usage_count(l_conn);
4318 spin_unlock_bh(&sess->conn_lock);
4324 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4326 spin_lock_bh(&l_conn->state_lock);
4327 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4328 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4329 spin_unlock_bh(&l_conn->state_lock);
4331 iscsit_cause_connection_reinstatement(l_conn, 1);
4332 iscsit_dec_conn_usage_count(l_conn);
4336 * Return of 0 causes the TX thread to restart.
4338 static int iscsit_logout_post_handler(
4339 struct iscsi_cmd *cmd,
4340 struct iscsi_conn *conn)
4344 switch (cmd->logout_reason) {
4345 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4346 switch (cmd->logout_response) {
4347 case ISCSI_LOGOUT_SUCCESS:
4348 case ISCSI_LOGOUT_CLEANUP_FAILED:
4350 iscsit_logout_post_handler_closesession(conn);
4355 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4356 if (conn->cid == cmd->logout_cid) {
4357 switch (cmd->logout_response) {
4358 case ISCSI_LOGOUT_SUCCESS:
4359 case ISCSI_LOGOUT_CLEANUP_FAILED:
4361 iscsit_logout_post_handler_samecid(conn);
4366 switch (cmd->logout_response) {
4367 case ISCSI_LOGOUT_SUCCESS:
4368 iscsit_logout_post_handler_diffcid(conn,
4371 case ISCSI_LOGOUT_CID_NOT_FOUND:
4372 case ISCSI_LOGOUT_CLEANUP_FAILED:
4379 case ISCSI_LOGOUT_REASON_RECOVERY:
4380 switch (cmd->logout_response) {
4381 case ISCSI_LOGOUT_SUCCESS:
4382 case ISCSI_LOGOUT_CID_NOT_FOUND:
4383 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4384 case ISCSI_LOGOUT_CLEANUP_FAILED:
4397 void iscsit_fail_session(struct iscsi_session *sess)
4399 struct iscsi_conn *conn;
4401 spin_lock_bh(&sess->conn_lock);
4402 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4403 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4404 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4406 spin_unlock_bh(&sess->conn_lock);
4408 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4409 sess->session_state = TARG_SESS_STATE_FAILED;
4412 int iscsit_free_session(struct iscsi_session *sess)
4414 u16 conn_count = atomic_read(&sess->nconn);
4415 struct iscsi_conn *conn, *conn_tmp = NULL;
4418 spin_lock_bh(&sess->conn_lock);
4419 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4421 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4423 if (conn_count == 0)
4426 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4429 iscsit_inc_conn_usage_count(conn_tmp);
4432 iscsit_inc_conn_usage_count(conn);
4434 spin_unlock_bh(&sess->conn_lock);
4435 iscsit_cause_connection_reinstatement(conn, 1);
4436 spin_lock_bh(&sess->conn_lock);
4438 iscsit_dec_conn_usage_count(conn);
4440 iscsit_dec_conn_usage_count(conn_tmp);
4445 if (atomic_read(&sess->nconn)) {
4446 spin_unlock_bh(&sess->conn_lock);
4447 wait_for_completion(&sess->session_wait_comp);
4449 spin_unlock_bh(&sess->conn_lock);
4451 iscsit_close_session(sess);
4455 void iscsit_stop_session(
4456 struct iscsi_session *sess,
4458 int connection_sleep)
4460 u16 conn_count = atomic_read(&sess->nconn);
4461 struct iscsi_conn *conn, *conn_tmp = NULL;
4464 spin_lock_bh(&sess->conn_lock);
4466 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4468 if (connection_sleep) {
4469 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4471 if (conn_count == 0)
4474 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4477 iscsit_inc_conn_usage_count(conn_tmp);
4480 iscsit_inc_conn_usage_count(conn);
4482 spin_unlock_bh(&sess->conn_lock);
4483 iscsit_cause_connection_reinstatement(conn, 1);
4484 spin_lock_bh(&sess->conn_lock);
4486 iscsit_dec_conn_usage_count(conn);
4488 iscsit_dec_conn_usage_count(conn_tmp);
4492 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4493 iscsit_cause_connection_reinstatement(conn, 0);
4496 if (session_sleep && atomic_read(&sess->nconn)) {
4497 spin_unlock_bh(&sess->conn_lock);
4498 wait_for_completion(&sess->session_wait_comp);
4500 spin_unlock_bh(&sess->conn_lock);
4503 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4505 struct iscsi_session *sess;
4506 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4507 struct se_session *se_sess, *se_sess_tmp;
4508 int session_count = 0;
4510 spin_lock_bh(&se_tpg->session_lock);
4511 if (tpg->nsessions && !force) {
4512 spin_unlock_bh(&se_tpg->session_lock);
4516 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4518 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4520 spin_lock(&sess->conn_lock);
4521 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4522 atomic_read(&sess->session_logout) ||
4523 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4524 spin_unlock(&sess->conn_lock);
4527 atomic_set(&sess->session_reinstatement, 1);
4528 spin_unlock(&sess->conn_lock);
4529 spin_unlock_bh(&se_tpg->session_lock);
4531 iscsit_free_session(sess);
4532 spin_lock_bh(&se_tpg->session_lock);
4536 spin_unlock_bh(&se_tpg->session_lock);
4538 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4539 " Group: %hu\n", session_count, tpg->tpgt);
4543 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4544 MODULE_VERSION("4.1.x");
4545 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4546 MODULE_LICENSE("GPL");
4548 module_init(iscsi_target_init_module);
4549 module_exit(iscsi_target_cleanup_module);