1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
33 #include <target/iscsi/iscsi_target_core.h>
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_datain_values.h"
37 #include "iscsi_target_erl0.h"
38 #include "iscsi_target_erl1.h"
39 #include "iscsi_target_erl2.h"
40 #include "iscsi_target_login.h"
41 #include "iscsi_target_tmr.h"
42 #include "iscsi_target_tpg.h"
43 #include "iscsi_target_util.h"
44 #include "iscsi_target.h"
45 #include "iscsi_target_device.h"
46 #include <target/iscsi/iscsi_target_stat.h>
48 #include <target/iscsi/iscsi_transport.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_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 struct iscsi_scsi_req *, u32);
70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
72 struct iscsi_tiqn *tiqn = NULL;
74 spin_lock(&tiqn_lock);
75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
76 if (!strcmp(tiqn->tiqn, buf)) {
78 spin_lock(&tiqn->tiqn_state_lock);
79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
80 tiqn->tiqn_access_count++;
81 spin_unlock(&tiqn->tiqn_state_lock);
82 spin_unlock(&tiqn_lock);
85 spin_unlock(&tiqn->tiqn_state_lock);
88 spin_unlock(&tiqn_lock);
93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
95 spin_lock(&tiqn->tiqn_state_lock);
96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
98 spin_unlock(&tiqn->tiqn_state_lock);
101 spin_unlock(&tiqn->tiqn_state_lock);
106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
108 spin_lock(&tiqn->tiqn_state_lock);
109 tiqn->tiqn_access_count--;
110 spin_unlock(&tiqn->tiqn_state_lock);
114 * Note that IQN formatting is expected to be done in userspace, and
115 * no explict IQN format checks are done here.
117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
119 struct iscsi_tiqn *tiqn = NULL;
122 if (strlen(buf) >= ISCSI_IQN_LEN) {
123 pr_err("Target IQN exceeds %d bytes\n",
125 return ERR_PTR(-EINVAL);
128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
130 pr_err("Unable to allocate struct iscsi_tiqn\n");
131 return ERR_PTR(-ENOMEM);
134 sprintf(tiqn->tiqn, "%s", buf);
135 INIT_LIST_HEAD(&tiqn->tiqn_list);
136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
137 spin_lock_init(&tiqn->tiqn_state_lock);
138 spin_lock_init(&tiqn->tiqn_tpg_lock);
139 spin_lock_init(&tiqn->sess_err_stats.lock);
140 spin_lock_init(&tiqn->login_stats.lock);
141 spin_lock_init(&tiqn->logout_stats.lock);
143 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145 idr_preload(GFP_KERNEL);
146 spin_lock(&tiqn_lock);
148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
151 spin_unlock(&tiqn_lock);
156 tiqn->tiqn_index = ret;
157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159 spin_unlock(&tiqn_lock);
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
171 * Wait for accesses to said struct iscsi_tiqn to end.
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
177 spin_lock(&tiqn->tiqn_state_lock);
179 spin_unlock(&tiqn->tiqn_state_lock);
182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
195 iscsit_wait_for_tiqn(tiqn);
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
211 * Determine if the network portal is accepting storage traffic.
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
218 spin_unlock_bh(&np->np_thread_lock);
220 * Determine if the portal group is accepting storage traffic.
222 spin_lock_bh(&tpg->tpg_state_lock);
223 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
224 spin_unlock_bh(&tpg->tpg_state_lock);
227 spin_unlock_bh(&tpg->tpg_state_lock);
230 * Here we serialize access across the TIQN+TPG Tuple.
232 ret = down_interruptible(&tpg->np_login_sem);
233 if ((ret != 0) || signal_pending(current))
236 spin_lock_bh(&tpg->tpg_state_lock);
237 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
238 spin_unlock_bh(&tpg->tpg_state_lock);
239 up(&tpg->np_login_sem);
242 spin_unlock_bh(&tpg->tpg_state_lock);
247 void iscsit_login_kref_put(struct kref *kref)
249 struct iscsi_tpg_np *tpg_np = container_of(kref,
250 struct iscsi_tpg_np, tpg_np_kref);
252 complete(&tpg_np->tpg_np_comp);
255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
256 struct iscsi_tpg_np *tpg_np)
258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260 up(&tpg->np_login_sem);
263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
266 iscsit_put_tiqn_for_login(tiqn);
271 bool iscsit_check_np_match(
272 struct __kernel_sockaddr_storage *sockaddr,
274 int network_transport)
276 struct sockaddr_in *sock_in, *sock_in_e;
277 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 bool ip_match = false;
281 if (sockaddr->ss_family == AF_INET6) {
282 sock_in6 = (struct sockaddr_in6 *)sockaddr;
283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285 if (!memcmp(&sock_in6->sin6_addr.in6_u,
286 &sock_in6_e->sin6_addr.in6_u,
287 sizeof(struct in6_addr)))
290 port = ntohs(sock_in6->sin6_port);
292 sock_in = (struct sockaddr_in *)sockaddr;
293 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
295 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 port = ntohs(sock_in->sin_port);
301 if (ip_match && (np->np_port == port) &&
302 (np->np_network_transport == network_transport))
309 * Called with mutex np_lock held
311 static struct iscsi_np *iscsit_get_np(
312 struct __kernel_sockaddr_storage *sockaddr,
313 int network_transport)
318 list_for_each_entry(np, &g_np_list, np_list) {
319 spin_lock_bh(&np->np_thread_lock);
320 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
321 spin_unlock_bh(&np->np_thread_lock);
325 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 * Increment the np_exports reference count now to
329 * prevent iscsit_del_np() below from being called
330 * while iscsi_tpg_add_network_portal() is called.
333 spin_unlock_bh(&np->np_thread_lock);
336 spin_unlock_bh(&np->np_thread_lock);
342 struct iscsi_np *iscsit_add_np(
343 struct __kernel_sockaddr_storage *sockaddr,
345 int network_transport)
347 struct sockaddr_in *sock_in;
348 struct sockaddr_in6 *sock_in6;
352 mutex_lock(&np_lock);
355 * Locate the existing struct iscsi_np if already active..
357 np = iscsit_get_np(sockaddr, network_transport);
359 mutex_unlock(&np_lock);
363 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
365 pr_err("Unable to allocate memory for struct iscsi_np\n");
366 mutex_unlock(&np_lock);
367 return ERR_PTR(-ENOMEM);
370 np->np_flags |= NPF_IP_NETWORK;
371 if (sockaddr->ss_family == AF_INET6) {
372 sock_in6 = (struct sockaddr_in6 *)sockaddr;
373 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
374 np->np_port = ntohs(sock_in6->sin6_port);
376 sock_in = (struct sockaddr_in *)sockaddr;
377 sprintf(np->np_ip, "%s", ip_str);
378 np->np_port = ntohs(sock_in->sin_port);
381 np->np_network_transport = network_transport;
382 spin_lock_init(&np->np_thread_lock);
383 init_completion(&np->np_restart_comp);
384 INIT_LIST_HEAD(&np->np_list);
386 ret = iscsi_target_setup_login_socket(np, sockaddr);
389 mutex_unlock(&np_lock);
393 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
394 if (IS_ERR(np->np_thread)) {
395 pr_err("Unable to create kthread: iscsi_np\n");
396 ret = PTR_ERR(np->np_thread);
398 mutex_unlock(&np_lock);
402 * Increment the np_exports reference count now to prevent
403 * iscsit_del_np() below from being run while a new call to
404 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
405 * active. We don't need to hold np->np_thread_lock at this
406 * point because iscsi_np has not been added to g_np_list yet.
409 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
411 list_add_tail(&np->np_list, &g_np_list);
412 mutex_unlock(&np_lock);
414 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
415 np->np_ip, np->np_port, np->np_transport->name);
420 int iscsit_reset_np_thread(
422 struct iscsi_tpg_np *tpg_np,
423 struct iscsi_portal_group *tpg,
426 spin_lock_bh(&np->np_thread_lock);
427 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
428 spin_unlock_bh(&np->np_thread_lock);
431 np->np_thread_state = ISCSI_NP_THREAD_RESET;
434 spin_unlock_bh(&np->np_thread_lock);
435 send_sig(SIGINT, np->np_thread, 1);
436 wait_for_completion(&np->np_restart_comp);
437 spin_lock_bh(&np->np_thread_lock);
439 spin_unlock_bh(&np->np_thread_lock);
441 if (tpg_np && shutdown) {
442 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
444 wait_for_completion(&tpg_np->tpg_np_comp);
450 static void iscsit_free_np(struct iscsi_np *np)
453 sock_release(np->np_socket);
456 int iscsit_del_np(struct iscsi_np *np)
458 spin_lock_bh(&np->np_thread_lock);
460 if (np->np_exports) {
462 spin_unlock_bh(&np->np_thread_lock);
465 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
466 spin_unlock_bh(&np->np_thread_lock);
470 * We need to send the signal to wakeup Linux/Net
471 * which may be sleeping in sock_accept()..
473 send_sig(SIGINT, np->np_thread, 1);
474 kthread_stop(np->np_thread);
475 np->np_thread = NULL;
478 np->np_transport->iscsit_free_np(np);
480 mutex_lock(&np_lock);
481 list_del(&np->np_list);
482 mutex_unlock(&np_lock);
484 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
485 np->np_ip, np->np_port, np->np_transport->name);
487 iscsit_put_transport(np->np_transport);
492 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
493 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
497 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
501 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
503 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
505 spin_lock_bh(&conn->cmd_lock);
506 if (!list_empty(&cmd->i_conn_node))
507 list_del_init(&cmd->i_conn_node);
508 spin_unlock_bh(&conn->cmd_lock);
510 __iscsit_free_cmd(cmd, scsi_cmd, true);
513 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
515 return TARGET_PROT_NORMAL;
518 static struct iscsit_transport iscsi_target_transport = {
520 .transport_type = ISCSI_TCP,
522 .iscsit_setup_np = iscsit_setup_np,
523 .iscsit_accept_np = iscsit_accept_np,
524 .iscsit_free_np = iscsit_free_np,
525 .iscsit_get_login_rx = iscsit_get_login_rx,
526 .iscsit_put_login_tx = iscsit_put_login_tx,
527 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
528 .iscsit_immediate_queue = iscsit_immediate_queue,
529 .iscsit_response_queue = iscsit_response_queue,
530 .iscsit_queue_data_in = iscsit_queue_rsp,
531 .iscsit_queue_status = iscsit_queue_rsp,
532 .iscsit_aborted_task = iscsit_aborted_task,
533 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
536 static int __init iscsi_target_init_module(void)
540 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
542 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
543 if (!iscsit_global) {
544 pr_err("Unable to allocate memory for iscsit_global\n");
547 spin_lock_init(&iscsit_global->ts_bitmap_lock);
548 mutex_init(&auth_id_lock);
549 spin_lock_init(&sess_idr_lock);
553 ret = target_register_template(&iscsi_ops);
557 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
558 iscsit_global->ts_bitmap = vzalloc(size);
559 if (!iscsit_global->ts_bitmap) {
560 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
564 lio_qr_cache = kmem_cache_create("lio_qr_cache",
565 sizeof(struct iscsi_queue_req),
566 __alignof__(struct iscsi_queue_req), 0, NULL);
568 pr_err("nable to kmem_cache_create() for"
573 lio_dr_cache = kmem_cache_create("lio_dr_cache",
574 sizeof(struct iscsi_datain_req),
575 __alignof__(struct iscsi_datain_req), 0, NULL);
577 pr_err("Unable to kmem_cache_create() for"
582 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
583 sizeof(struct iscsi_ooo_cmdsn),
584 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
585 if (!lio_ooo_cache) {
586 pr_err("Unable to kmem_cache_create() for"
591 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
592 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
594 if (!lio_r2t_cache) {
595 pr_err("Unable to kmem_cache_create() for"
600 iscsit_register_transport(&iscsi_target_transport);
602 if (iscsit_load_discovery_tpg() < 0)
607 iscsit_unregister_transport(&iscsi_target_transport);
608 kmem_cache_destroy(lio_r2t_cache);
610 kmem_cache_destroy(lio_ooo_cache);
612 kmem_cache_destroy(lio_dr_cache);
614 kmem_cache_destroy(lio_qr_cache);
616 vfree(iscsit_global->ts_bitmap);
618 /* XXX: this probably wants it to be it's own unwind step.. */
619 if (iscsit_global->discovery_tpg)
620 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
621 target_unregister_template(&iscsi_ops);
623 kfree(iscsit_global);
627 static void __exit iscsi_target_cleanup_module(void)
629 iscsit_release_discovery_tpg();
630 iscsit_unregister_transport(&iscsi_target_transport);
631 kmem_cache_destroy(lio_qr_cache);
632 kmem_cache_destroy(lio_dr_cache);
633 kmem_cache_destroy(lio_ooo_cache);
634 kmem_cache_destroy(lio_r2t_cache);
637 * Shutdown discovery sessions and disable discovery TPG
639 if (iscsit_global->discovery_tpg)
640 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
642 target_unregister_template(&iscsi_ops);
644 vfree(iscsit_global->ts_bitmap);
645 kfree(iscsit_global);
648 static int iscsit_add_reject(
649 struct iscsi_conn *conn,
653 struct iscsi_cmd *cmd;
655 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
659 cmd->iscsi_opcode = ISCSI_OP_REJECT;
660 cmd->reject_reason = reason;
662 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
664 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
665 iscsit_free_cmd(cmd, false);
669 spin_lock_bh(&conn->cmd_lock);
670 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
671 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);
679 static int iscsit_add_reject_from_cmd(
680 struct iscsi_cmd *cmd,
685 struct iscsi_conn *conn;
688 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
694 cmd->iscsi_opcode = ISCSI_OP_REJECT;
695 cmd->reject_reason = reason;
697 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
699 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
700 iscsit_free_cmd(cmd, false);
705 spin_lock_bh(&conn->cmd_lock);
706 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
707 spin_unlock_bh(&conn->cmd_lock);
710 cmd->i_state = ISTATE_SEND_REJECT;
711 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
713 * Perform the kref_put now if se_cmd has already been setup by
714 * scsit_setup_scsi_cmd()
716 if (cmd->se_cmd.se_tfo != NULL) {
717 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
718 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
723 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
726 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
729 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
731 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
735 * Map some portion of the allocated scatterlist to an iovec, suitable for
736 * kernel sockets to copy data in/out.
738 static int iscsit_map_iovec(
739 struct iscsi_cmd *cmd,
745 struct scatterlist *sg;
746 unsigned int page_off;
749 * We know each entry in t_data_sg contains a page.
751 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
752 page_off = (data_offset % PAGE_SIZE);
754 cmd->first_data_sg = sg;
755 cmd->first_data_sg_off = page_off;
757 while (data_length) {
758 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
760 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
761 iov[i].iov_len = cur_len;
763 data_length -= cur_len;
769 cmd->kmapped_nents = i;
774 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
777 struct scatterlist *sg;
779 sg = cmd->first_data_sg;
781 for (i = 0; i < cmd->kmapped_nents; i++)
782 kunmap(sg_page(&sg[i]));
785 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
788 struct iscsi_cmd *cmd, *cmd_p;
790 conn->exp_statsn = exp_statsn;
792 if (conn->sess->sess_ops->RDMAExtensions)
795 spin_lock_bh(&conn->cmd_lock);
796 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
797 spin_lock(&cmd->istate_lock);
798 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
799 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
800 cmd->i_state = ISTATE_REMOVE;
801 spin_unlock(&cmd->istate_lock);
802 list_move_tail(&cmd->i_conn_node, &ack_list);
805 spin_unlock(&cmd->istate_lock);
807 spin_unlock_bh(&conn->cmd_lock);
809 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
810 list_del_init(&cmd->i_conn_node);
811 iscsit_free_cmd(cmd, false);
815 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
817 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
819 iov_count += ISCSI_IOV_DATA_BUFFER;
821 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
822 if (!cmd->iov_data) {
823 pr_err("Unable to allocate cmd->iov_data\n");
827 cmd->orig_iov_data_count = iov_count;
831 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
834 int data_direction, payload_length;
835 struct iscsi_scsi_req *hdr;
839 atomic_long_inc(&conn->sess->cmd_pdus);
841 hdr = (struct iscsi_scsi_req *) buf;
842 payload_length = ntoh24(hdr->dlength);
844 /* FIXME; Add checks for AdditionalHeaderSegment */
846 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
847 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
848 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
849 " not set. Bad iSCSI Initiator.\n");
850 return iscsit_add_reject_cmd(cmd,
851 ISCSI_REASON_BOOKMARK_INVALID, buf);
854 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
855 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
857 * From RFC-3720 Section 10.3.1:
859 * "Either or both of R and W MAY be 1 when either the
860 * Expected Data Transfer Length and/or Bidirectional Read
861 * Expected Data Transfer Length are 0"
863 * For this case, go ahead and clear the unnecssary bits
864 * to avoid any confusion with ->data_direction.
866 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
867 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
869 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
870 " set when Expected Data Transfer Length is 0 for"
871 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
874 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
875 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
876 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
877 " MUST be set if Expected Data Transfer Length is not 0."
878 " Bad iSCSI Initiator\n");
879 return iscsit_add_reject_cmd(cmd,
880 ISCSI_REASON_BOOKMARK_INVALID, buf);
883 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
884 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
885 pr_err("Bidirectional operations not supported!\n");
886 return iscsit_add_reject_cmd(cmd,
887 ISCSI_REASON_BOOKMARK_INVALID, buf);
890 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
891 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
892 " Scsi Command PDU.\n");
893 return iscsit_add_reject_cmd(cmd,
894 ISCSI_REASON_BOOKMARK_INVALID, buf);
897 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
898 pr_err("ImmediateData=No but DataSegmentLength=%u,"
899 " protocol error.\n", payload_length);
900 return iscsit_add_reject_cmd(cmd,
901 ISCSI_REASON_PROTOCOL_ERROR, buf);
904 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
905 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
906 pr_err("Expected Data Transfer Length and Length of"
907 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
908 " bit is not set protocol error\n");
909 return iscsit_add_reject_cmd(cmd,
910 ISCSI_REASON_PROTOCOL_ERROR, buf);
913 if (payload_length > be32_to_cpu(hdr->data_length)) {
914 pr_err("DataSegmentLength: %u is greater than"
915 " EDTL: %u, protocol error.\n", payload_length,
917 return iscsit_add_reject_cmd(cmd,
918 ISCSI_REASON_PROTOCOL_ERROR, buf);
921 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
922 pr_err("DataSegmentLength: %u is greater than"
923 " MaxXmitDataSegmentLength: %u, protocol error.\n",
924 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
925 return iscsit_add_reject_cmd(cmd,
926 ISCSI_REASON_PROTOCOL_ERROR, buf);
929 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
930 pr_err("DataSegmentLength: %u is greater than"
931 " FirstBurstLength: %u, protocol error.\n",
932 payload_length, conn->sess->sess_ops->FirstBurstLength);
933 return iscsit_add_reject_cmd(cmd,
934 ISCSI_REASON_BOOKMARK_INVALID, buf);
937 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
938 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
941 cmd->data_direction = data_direction;
942 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
944 * Figure out the SAM Task Attribute for the incoming SCSI CDB
946 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
947 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
948 sam_task_attr = TCM_SIMPLE_TAG;
949 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
950 sam_task_attr = TCM_ORDERED_TAG;
951 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
952 sam_task_attr = TCM_HEAD_TAG;
953 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
954 sam_task_attr = TCM_ACA_TAG;
956 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
957 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
958 sam_task_attr = TCM_SIMPLE_TAG;
961 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
962 cmd->i_state = ISTATE_NEW_CMD;
963 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
964 cmd->immediate_data = (payload_length) ? 1 : 0;
965 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
966 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
967 if (cmd->unsolicited_data)
968 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
970 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
971 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
972 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
973 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
974 cmd->targ_xfer_tag = 0xFFFFFFFF;
975 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
976 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
977 cmd->first_burst_len = payload_length;
979 if (!conn->sess->sess_ops->RDMAExtensions &&
980 cmd->data_direction == DMA_FROM_DEVICE) {
981 struct iscsi_datain_req *dr;
983 dr = iscsit_allocate_datain_req();
985 return iscsit_add_reject_cmd(cmd,
986 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
988 iscsit_attach_datain_req(cmd, dr);
992 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
994 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
995 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
996 cmd->data_direction, sam_task_attr,
997 cmd->sense_buffer + 2);
999 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1000 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1001 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1004 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1006 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1007 scsilun_to_int(&hdr->lun));
1008 if (cmd->sense_reason)
1011 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1012 if (cmd->sense_reason) {
1013 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1014 return iscsit_add_reject_cmd(cmd,
1015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1021 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1022 return iscsit_add_reject_cmd(cmd,
1023 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1027 spin_lock_bh(&conn->cmd_lock);
1028 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1029 spin_unlock_bh(&conn->cmd_lock);
1031 * Check if we need to delay processing because of ALUA
1032 * Active/NonOptimized primary access state..
1034 core_alua_check_nonop_delay(&cmd->se_cmd);
1038 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1040 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1042 iscsit_set_dataout_sequence_values(cmd);
1044 spin_lock_bh(&cmd->dataout_timeout_lock);
1045 iscsit_start_dataout_timer(cmd, cmd->conn);
1046 spin_unlock_bh(&cmd->dataout_timeout_lock);
1048 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1050 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1051 struct iscsi_scsi_req *hdr)
1055 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1056 * the Immediate Bit is not set, and no Immediate
1059 * A PDU/CmdSN carrying Immediate Data can only
1060 * be processed after the DataCRC has passed.
1061 * If the DataCRC fails, the CmdSN MUST NOT
1062 * be acknowledged. (See below)
1064 if (!cmd->immediate_data) {
1065 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1066 (unsigned char *)hdr, hdr->cmdsn);
1067 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1069 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1070 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1075 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1078 * If no Immediate Data is attached, it's OK to return now.
1080 if (!cmd->immediate_data) {
1081 if (!cmd->sense_reason && cmd->unsolicited_data)
1082 iscsit_set_unsoliticed_dataout(cmd);
1083 if (!cmd->sense_reason)
1086 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1091 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1092 * execution. These exceptions are processed in CmdSN order using
1093 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1095 if (cmd->sense_reason) {
1096 if (cmd->reject_reason)
1102 * Call directly into transport_generic_new_cmd() to perform
1103 * the backend memory allocation.
1105 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1106 if (cmd->sense_reason)
1111 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1114 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1117 struct iscsi_conn *conn = cmd->conn;
1118 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1120 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1123 goto after_immediate_data;
1125 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1126 cmd->first_burst_len);
1127 after_immediate_data:
1128 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1130 * A PDU/CmdSN carrying Immediate Data passed
1131 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1132 * Immediate Bit is not set.
1134 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1135 (unsigned char *)hdr, hdr->cmdsn);
1136 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1139 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1142 rc = iscsit_dump_data_payload(cmd->conn,
1143 cmd->first_burst_len, 1);
1144 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1146 } else if (cmd->unsolicited_data)
1147 iscsit_set_unsoliticed_dataout(cmd);
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, cmd->conn, cmd->i_state);
1163 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1170 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1173 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1175 bool dump_payload = false;
1177 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1181 * Allocation iovecs needed for struct socket operations for
1182 * traditional iSCSI block I/O.
1184 if (iscsit_allocate_iovecs(cmd) < 0) {
1185 return iscsit_reject_cmd(cmd,
1186 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1188 immed_data = cmd->immediate_data;
1190 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1194 dump_payload = true;
1199 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1202 static u32 iscsit_do_crypto_hash_sg(
1203 struct hash_desc *hash,
1204 struct iscsi_cmd *cmd,
1212 struct scatterlist *sg;
1213 unsigned int page_off;
1215 crypto_hash_init(hash);
1217 sg = cmd->first_data_sg;
1218 page_off = cmd->first_data_sg_off;
1221 while (data_length) {
1222 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1224 crypto_hash_update(hash, &sg[i], cur_len);
1226 data_length -= cur_len;
1232 struct scatterlist pad_sg;
1234 sg_init_one(&pad_sg, pad_bytes, padding);
1235 crypto_hash_update(hash, &pad_sg, padding);
1237 crypto_hash_final(hash, (u8 *) &data_crc);
1242 static void iscsit_do_crypto_hash_buf(
1243 struct hash_desc *hash,
1250 struct scatterlist sg;
1252 crypto_hash_init(hash);
1254 sg_init_one(&sg, buf, payload_length);
1255 crypto_hash_update(hash, &sg, payload_length);
1258 sg_init_one(&sg, pad_bytes, padding);
1259 crypto_hash_update(hash, &sg, padding);
1261 crypto_hash_final(hash, data_crc);
1265 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1266 struct iscsi_cmd **out_cmd)
1268 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1269 struct iscsi_cmd *cmd = NULL;
1270 struct se_cmd *se_cmd;
1271 u32 payload_length = ntoh24(hdr->dlength);
1274 if (!payload_length) {
1275 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1280 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1282 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1283 pr_err("DataSegmentLength: %u is greater than"
1284 " MaxXmitDataSegmentLength: %u\n", payload_length,
1285 conn->conn_ops->MaxXmitDataSegmentLength);
1286 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1290 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1295 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1296 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1297 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1298 payload_length, conn->cid);
1300 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1301 pr_err("Command ITT: 0x%08x received DataOUT after"
1302 " last DataOUT received, dumping payload\n",
1303 cmd->init_task_tag);
1304 return iscsit_dump_data_payload(conn, payload_length, 1);
1307 if (cmd->data_direction != DMA_TO_DEVICE) {
1308 pr_err("Command ITT: 0x%08x received DataOUT for a"
1309 " NON-WRITE command.\n", cmd->init_task_tag);
1310 return iscsit_dump_data_payload(conn, payload_length, 1);
1312 se_cmd = &cmd->se_cmd;
1313 iscsit_mod_dataout_timer(cmd);
1315 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1316 pr_err("DataOut Offset: %u, Length %u greater than"
1317 " iSCSI Command EDTL %u, protocol error.\n",
1318 hdr->offset, payload_length, cmd->se_cmd.data_length);
1319 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1322 if (cmd->unsolicited_data) {
1323 int dump_unsolicited_data = 0;
1325 if (conn->sess->sess_ops->InitialR2T) {
1326 pr_err("Received unexpected unsolicited data"
1327 " while InitialR2T=Yes, protocol error.\n");
1328 transport_send_check_condition_and_sense(&cmd->se_cmd,
1329 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1333 * Special case for dealing with Unsolicited DataOUT
1334 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1338 /* Something's amiss if we're not in WRITE_PENDING state... */
1339 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1340 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1341 dump_unsolicited_data = 1;
1343 if (dump_unsolicited_data) {
1345 * Check if a delayed TASK_ABORTED status needs to
1346 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1347 * received with the unsolicitied data out.
1349 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1350 iscsit_stop_dataout_timer(cmd);
1352 transport_check_aborted_status(se_cmd,
1353 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1354 return iscsit_dump_data_payload(conn, payload_length, 1);
1358 * For the normal solicited data path:
1360 * Check for a delayed TASK_ABORTED status and dump any
1361 * incoming data out payload if one exists. Also, when the
1362 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1363 * data out sequence, we decrement outstanding_r2ts. Once
1364 * outstanding_r2ts reaches zero, go ahead and send the delayed
1365 * TASK_ABORTED status.
1367 if (se_cmd->transport_state & CMD_T_ABORTED) {
1368 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1369 if (--cmd->outstanding_r2ts < 1) {
1370 iscsit_stop_dataout_timer(cmd);
1371 transport_check_aborted_status(
1375 return iscsit_dump_data_payload(conn, payload_length, 1);
1379 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1380 * within-command recovery checks before receiving the payload.
1382 rc = iscsit_check_pre_dataout(cmd, buf);
1383 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1385 else if (rc == DATAOUT_CANNOT_RECOVER)
1391 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1394 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1395 struct iscsi_data *hdr)
1398 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1399 u32 payload_length = ntoh24(hdr->dlength);
1400 int iov_ret, data_crc_failed = 0;
1402 rx_size += payload_length;
1403 iov = &cmd->iov_data[0];
1405 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1410 iov_count += iov_ret;
1412 padding = ((-payload_length) & 3);
1414 iov[iov_count].iov_base = cmd->pad_bytes;
1415 iov[iov_count++].iov_len = padding;
1417 pr_debug("Receiving %u padding bytes.\n", padding);
1420 if (conn->conn_ops->DataDigest) {
1421 iov[iov_count].iov_base = &checksum;
1422 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1423 rx_size += ISCSI_CRC_LEN;
1426 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1428 iscsit_unmap_iovec(cmd);
1430 if (rx_got != rx_size)
1433 if (conn->conn_ops->DataDigest) {
1436 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1437 be32_to_cpu(hdr->offset),
1438 payload_length, padding,
1441 if (checksum != data_crc) {
1442 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1443 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1444 " does not match computed 0x%08x\n",
1445 hdr->itt, hdr->offset, payload_length,
1446 hdr->datasn, checksum, data_crc);
1447 data_crc_failed = 1;
1449 pr_debug("Got CRC32C DataDigest 0x%08x for"
1450 " %u bytes of Data Out\n", checksum,
1455 return data_crc_failed;
1459 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1460 bool data_crc_failed)
1462 struct iscsi_conn *conn = cmd->conn;
1465 * Increment post receive data and CRC values or perform
1466 * within-command recovery.
1468 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1469 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1471 else if (rc == DATAOUT_SEND_R2T) {
1472 iscsit_set_dataout_sequence_values(cmd);
1473 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1474 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1476 * Handle extra special case for out of order
1477 * Unsolicited Data Out.
1479 spin_lock_bh(&cmd->istate_lock);
1480 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1481 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1482 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1483 spin_unlock_bh(&cmd->istate_lock);
1485 iscsit_stop_dataout_timer(cmd);
1488 target_execute_cmd(&cmd->se_cmd);
1490 } else /* DATAOUT_CANNOT_RECOVER */
1495 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1497 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1499 struct iscsi_cmd *cmd = NULL;
1500 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1502 bool data_crc_failed = false;
1504 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1510 rc = iscsit_get_dataout(conn, cmd, hdr);
1514 data_crc_failed = true;
1516 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1519 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1520 struct iscsi_nopout *hdr)
1522 u32 payload_length = ntoh24(hdr->dlength);
1524 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1525 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1527 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1528 (unsigned char *)hdr);
1530 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1531 (unsigned char *)hdr);
1534 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1535 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1536 " not set, protocol error.\n");
1538 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1539 (unsigned char *)hdr);
1541 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1542 (unsigned char *)hdr);
1545 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1546 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1547 " greater than MaxXmitDataSegmentLength: %u, protocol"
1548 " error.\n", payload_length,
1549 conn->conn_ops->MaxXmitDataSegmentLength);
1551 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1552 (unsigned char *)hdr);
1554 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1555 (unsigned char *)hdr);
1558 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1559 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1560 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1561 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1564 * This is not a response to a Unsolicited NopIN, which means
1565 * it can either be a NOPOUT ping request (with a valid ITT),
1566 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1567 * Either way, make sure we allocate an struct iscsi_cmd, as both
1568 * can contain ping data.
1570 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1571 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1572 cmd->i_state = ISTATE_SEND_NOPIN;
1573 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1576 cmd->targ_xfer_tag = 0xFFFFFFFF;
1577 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1578 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1579 cmd->data_direction = DMA_NONE;
1584 EXPORT_SYMBOL(iscsit_setup_nop_out);
1586 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1587 struct iscsi_nopout *hdr)
1589 struct iscsi_cmd *cmd_p = NULL;
1592 * Initiator is expecting a NopIN ping reply..
1594 if (hdr->itt != RESERVED_ITT) {
1596 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1597 (unsigned char *)hdr);
1599 spin_lock_bh(&conn->cmd_lock);
1600 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1601 spin_unlock_bh(&conn->cmd_lock);
1603 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1605 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1606 iscsit_add_cmd_to_response_queue(cmd, conn,
1611 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1612 (unsigned char *)hdr, hdr->cmdsn);
1613 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1615 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1621 * This was a response to a unsolicited NOPIN ping.
1623 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1624 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1628 iscsit_stop_nopin_response_timer(conn);
1630 cmd_p->i_state = ISTATE_REMOVE;
1631 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1633 iscsit_start_nopin_timer(conn);
1637 * Otherwise, initiator is not expecting a NOPIN is response.
1638 * Just ignore for now.
1642 EXPORT_SYMBOL(iscsit_process_nop_out);
1644 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1647 unsigned char *ping_data = NULL;
1648 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1649 struct kvec *iov = NULL;
1650 u32 payload_length = ntoh24(hdr->dlength);
1653 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1657 * Handle NOP-OUT payload for traditional iSCSI sockets
1659 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1660 u32 checksum, data_crc, padding = 0;
1661 int niov = 0, rx_got, rx_size = payload_length;
1663 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1665 pr_err("Unable to allocate memory for"
1666 " NOPOUT ping data.\n");
1671 iov = &cmd->iov_misc[0];
1672 iov[niov].iov_base = ping_data;
1673 iov[niov++].iov_len = payload_length;
1675 padding = ((-payload_length) & 3);
1677 pr_debug("Receiving %u additional bytes"
1678 " for padding.\n", padding);
1679 iov[niov].iov_base = &cmd->pad_bytes;
1680 iov[niov++].iov_len = padding;
1683 if (conn->conn_ops->DataDigest) {
1684 iov[niov].iov_base = &checksum;
1685 iov[niov++].iov_len = ISCSI_CRC_LEN;
1686 rx_size += ISCSI_CRC_LEN;
1689 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1690 if (rx_got != rx_size) {
1695 if (conn->conn_ops->DataDigest) {
1696 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1697 ping_data, payload_length,
1698 padding, cmd->pad_bytes,
1701 if (checksum != data_crc) {
1702 pr_err("Ping data CRC32C DataDigest"
1703 " 0x%08x does not match computed 0x%08x\n",
1704 checksum, data_crc);
1705 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1706 pr_err("Unable to recover from"
1707 " NOPOUT Ping DataCRC failure while in"
1713 * Silently drop this PDU and let the
1714 * initiator plug the CmdSN gap.
1716 pr_debug("Dropping NOPOUT"
1717 " Command CmdSN: 0x%08x due to"
1718 " DataCRC error.\n", hdr->cmdsn);
1723 pr_debug("Got CRC32C DataDigest"
1724 " 0x%08x for %u bytes of ping data.\n",
1725 checksum, payload_length);
1729 ping_data[payload_length] = '\0';
1731 * Attach ping data to struct iscsi_cmd->buf_ptr.
1733 cmd->buf_ptr = ping_data;
1734 cmd->buf_ptr_size = payload_length;
1736 pr_debug("Got %u bytes of NOPOUT ping"
1737 " data.\n", payload_length);
1738 pr_debug("Ping Data: \"%s\"\n", ping_data);
1741 return iscsit_process_nop_out(conn, cmd, hdr);
1744 iscsit_free_cmd(cmd, false);
1751 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1754 struct se_tmr_req *se_tmr;
1755 struct iscsi_tmr_req *tmr_req;
1756 struct iscsi_tm *hdr;
1757 int out_of_order_cmdsn = 0, ret;
1758 bool sess_ref = false;
1761 hdr = (struct iscsi_tm *) buf;
1762 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1763 function = hdr->flags;
1765 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1766 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1767 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1768 hdr->rtt, hdr->refcmdsn, conn->cid);
1770 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1771 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1772 hdr->rtt != RESERVED_ITT)) {
1773 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1774 hdr->rtt = RESERVED_ITT;
1777 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1778 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1779 pr_err("Task Management Request TASK_REASSIGN not"
1780 " issued as immediate command, bad iSCSI Initiator"
1781 "implementation\n");
1782 return iscsit_add_reject_cmd(cmd,
1783 ISCSI_REASON_PROTOCOL_ERROR, buf);
1785 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1786 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1787 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1789 cmd->data_direction = DMA_NONE;
1791 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1792 if (!cmd->tmr_req) {
1793 pr_err("Unable to allocate memory for"
1794 " Task Management command!\n");
1795 return iscsit_add_reject_cmd(cmd,
1796 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1801 * TASK_REASSIGN for ERL=2 / connection stays inside of
1802 * LIO-Target $FABRIC_MOD
1804 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1809 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1810 conn->sess->se_sess, 0, DMA_NONE,
1811 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1813 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1817 case ISCSI_TM_FUNC_ABORT_TASK:
1818 tcm_function = TMR_ABORT_TASK;
1820 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1821 tcm_function = TMR_ABORT_TASK_SET;
1823 case ISCSI_TM_FUNC_CLEAR_ACA:
1824 tcm_function = TMR_CLEAR_ACA;
1826 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1827 tcm_function = TMR_CLEAR_TASK_SET;
1829 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1830 tcm_function = TMR_LUN_RESET;
1832 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1833 tcm_function = TMR_TARGET_WARM_RESET;
1835 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1836 tcm_function = TMR_TARGET_COLD_RESET;
1839 pr_err("Unknown iSCSI TMR Function:"
1840 " 0x%02x\n", function);
1841 return iscsit_add_reject_cmd(cmd,
1842 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1845 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846 tcm_function, GFP_KERNEL);
1848 return iscsit_add_reject_cmd(cmd,
1849 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1851 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1854 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1855 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1856 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1857 cmd->init_task_tag = hdr->itt;
1858 cmd->targ_xfer_tag = 0xFFFFFFFF;
1859 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1860 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1861 se_tmr = cmd->se_cmd.se_tmr_req;
1862 tmr_req = cmd->tmr_req;
1864 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1866 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1867 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1868 scsilun_to_int(&hdr->lun));
1870 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1876 case ISCSI_TM_FUNC_ABORT_TASK:
1877 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1878 if (se_tmr->response)
1881 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1882 case ISCSI_TM_FUNC_CLEAR_ACA:
1883 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1884 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1886 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1887 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1888 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1892 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1893 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1894 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1898 case ISCSI_TM_FUNC_TASK_REASSIGN:
1899 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1901 * Perform sanity checks on the ExpDataSN only if the
1902 * TASK_REASSIGN was successful.
1904 if (se_tmr->response)
1907 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1908 return iscsit_add_reject_cmd(cmd,
1909 ISCSI_REASON_BOOKMARK_INVALID, buf);
1912 pr_err("Unknown TMR function: 0x%02x, protocol"
1913 " error.\n", function);
1914 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1918 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1919 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1920 se_tmr->call_transport = 1;
1922 spin_lock_bh(&conn->cmd_lock);
1923 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1924 spin_unlock_bh(&conn->cmd_lock);
1926 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1927 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1928 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1929 out_of_order_cmdsn = 1;
1930 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1932 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1935 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1937 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1940 * Found the referenced task, send to transport for processing.
1942 if (se_tmr->call_transport)
1943 return transport_generic_handle_tmr(&cmd->se_cmd);
1946 * Could not find the referenced LUN, task, or Task Management
1947 * command not authorized or supported. Change state and
1948 * let the tx_thread send the response.
1950 * For connection recovery, this is also the default action for
1951 * TMR TASK_REASSIGN.
1954 pr_debug("Handle TMR, using sess_ref=true check\n");
1955 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1958 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966 struct iscsi_text *hdr)
1968 u32 payload_length = ntoh24(hdr->dlength);
1970 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1971 pr_err("Unable to accept text parameter length: %u"
1972 "greater than MaxXmitDataSegmentLength %u.\n",
1973 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1974 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1975 (unsigned char *)hdr);
1978 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1979 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1980 pr_err("Multi sequence text commands currently not supported\n");
1981 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1982 (unsigned char *)hdr);
1985 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1987 hdr->exp_statsn, payload_length);
1989 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1990 cmd->i_state = ISTATE_SEND_TEXTRSP;
1991 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1992 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1993 cmd->targ_xfer_tag = 0xFFFFFFFF;
1994 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1995 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1996 cmd->data_direction = DMA_NONE;
1997 cmd->text_in_ptr = NULL;
2001 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2004 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2005 struct iscsi_text *hdr)
2007 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2011 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2012 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2013 pr_err("Unable to locate text_in buffer for sendtargets"
2017 goto empty_sendtargets;
2019 if (strncmp("SendTargets", text_in, 11) != 0) {
2020 pr_err("Received Text Data that is not"
2021 " SendTargets, cannot continue.\n");
2024 text_ptr = strchr(text_in, '=');
2026 pr_err("No \"=\" separator found in Text Data,"
2027 " cannot continue.\n");
2030 if (!strncmp("=All", text_ptr, 4)) {
2031 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2032 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2033 !strncmp("=eui.", text_ptr, 5)) {
2034 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2036 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2040 spin_lock_bh(&conn->cmd_lock);
2041 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2042 spin_unlock_bh(&conn->cmd_lock);
2045 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2047 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2048 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2049 (unsigned char *)hdr, hdr->cmdsn);
2050 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2056 return iscsit_execute_cmd(cmd, 0);
2059 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2060 (unsigned char *)hdr);
2062 EXPORT_SYMBOL(iscsit_process_text_cmd);
2065 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2068 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2069 char *text_in = NULL;
2070 u32 payload_length = ntoh24(hdr->dlength);
2073 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2077 rx_size = payload_length;
2078 if (payload_length) {
2079 u32 checksum = 0, data_crc = 0;
2080 u32 padding = 0, pad_bytes = 0;
2081 int niov = 0, rx_got;
2084 text_in = kzalloc(payload_length, GFP_KERNEL);
2086 pr_err("Unable to allocate memory for"
2087 " incoming text parameters\n");
2090 cmd->text_in_ptr = text_in;
2092 memset(iov, 0, 3 * sizeof(struct kvec));
2093 iov[niov].iov_base = text_in;
2094 iov[niov++].iov_len = payload_length;
2096 padding = ((-payload_length) & 3);
2098 iov[niov].iov_base = &pad_bytes;
2099 iov[niov++].iov_len = padding;
2101 pr_debug("Receiving %u additional bytes"
2102 " for padding.\n", padding);
2104 if (conn->conn_ops->DataDigest) {
2105 iov[niov].iov_base = &checksum;
2106 iov[niov++].iov_len = ISCSI_CRC_LEN;
2107 rx_size += ISCSI_CRC_LEN;
2110 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2111 if (rx_got != rx_size)
2114 if (conn->conn_ops->DataDigest) {
2115 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2116 text_in, payload_length,
2117 padding, (u8 *)&pad_bytes,
2120 if (checksum != data_crc) {
2121 pr_err("Text data CRC32C DataDigest"
2122 " 0x%08x does not match computed"
2123 " 0x%08x\n", checksum, data_crc);
2124 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2125 pr_err("Unable to recover from"
2126 " Text Data digest failure while in"
2131 * Silently drop this PDU and let the
2132 * initiator plug the CmdSN gap.
2134 pr_debug("Dropping Text"
2135 " Command CmdSN: 0x%08x due to"
2136 " DataCRC error.\n", hdr->cmdsn);
2141 pr_debug("Got CRC32C DataDigest"
2142 " 0x%08x for %u bytes of text data.\n",
2143 checksum, payload_length);
2146 text_in[payload_length - 1] = '\0';
2147 pr_debug("Successfully read %d bytes of text"
2148 " data.\n", payload_length);
2151 return iscsit_process_text_cmd(conn, cmd, hdr);
2154 kfree(cmd->text_in_ptr);
2155 cmd->text_in_ptr = NULL;
2156 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2159 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2161 struct iscsi_conn *conn_p;
2162 struct iscsi_session *sess = conn->sess;
2164 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2165 " for SID: %u.\n", conn->cid, conn->sess->sid);
2167 atomic_set(&sess->session_logout, 1);
2168 atomic_set(&conn->conn_logout_remove, 1);
2169 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2171 iscsit_inc_conn_usage_count(conn);
2172 iscsit_inc_session_usage_count(sess);
2174 spin_lock_bh(&sess->conn_lock);
2175 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2176 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2179 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2180 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182 spin_unlock_bh(&sess->conn_lock);
2184 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2189 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191 struct iscsi_conn *l_conn;
2192 struct iscsi_session *sess = conn->sess;
2194 pr_debug("Received logout request CLOSECONNECTION for CID:"
2195 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2198 * A Logout Request with a CLOSECONNECTION reason code for a CID
2199 * can arrive on a connection with a differing CID.
2201 if (conn->cid == cmd->logout_cid) {
2202 spin_lock_bh(&conn->state_lock);
2203 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2204 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2206 atomic_set(&conn->conn_logout_remove, 1);
2207 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2208 iscsit_inc_conn_usage_count(conn);
2210 spin_unlock_bh(&conn->state_lock);
2213 * Handle all different cid CLOSECONNECTION requests in
2214 * iscsit_logout_post_handler_diffcid() as to give enough
2215 * time for any non immediate command's CmdSN to be
2216 * acknowledged on the connection in question.
2218 * Here we simply make sure the CID is still around.
2220 l_conn = iscsit_get_conn_from_cid(sess,
2223 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2224 iscsit_add_cmd_to_response_queue(cmd, conn,
2229 iscsit_dec_conn_usage_count(l_conn);
2232 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2237 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2239 struct iscsi_session *sess = conn->sess;
2241 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2242 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2244 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2245 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2246 " while ERL!=2.\n");
2247 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2248 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2252 if (conn->cid == cmd->logout_cid) {
2253 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2254 " with CID: %hu on CID: %hu, implementation error.\n",
2255 cmd->logout_cid, conn->cid);
2256 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2257 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2261 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2267 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2270 int cmdsn_ret, logout_remove = 0;
2272 struct iscsi_logout *hdr;
2273 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2275 hdr = (struct iscsi_logout *) buf;
2276 reason_code = (hdr->flags & 0x7f);
2279 spin_lock(&tiqn->logout_stats.lock);
2280 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2281 tiqn->logout_stats.normal_logouts++;
2283 tiqn->logout_stats.abnormal_logouts++;
2284 spin_unlock(&tiqn->logout_stats.lock);
2287 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2288 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2289 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2290 hdr->cid, conn->cid);
2292 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2293 pr_err("Received logout request on connection that"
2294 " is not in logged in state, ignoring request.\n");
2295 iscsit_free_cmd(cmd, false);
2299 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2300 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2301 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2302 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2303 cmd->targ_xfer_tag = 0xFFFFFFFF;
2304 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2305 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2306 cmd->logout_cid = be16_to_cpu(hdr->cid);
2307 cmd->logout_reason = reason_code;
2308 cmd->data_direction = DMA_NONE;
2311 * We need to sleep in these cases (by returning 1) until the Logout
2312 * Response gets sent in the tx thread.
2314 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2315 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2316 be16_to_cpu(hdr->cid) == conn->cid))
2319 spin_lock_bh(&conn->cmd_lock);
2320 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2321 spin_unlock_bh(&conn->cmd_lock);
2323 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2324 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2327 * Immediate commands are executed, well, immediately.
2328 * Non-Immediate Logout Commands are executed in CmdSN order.
2330 if (cmd->immediate_cmd) {
2331 int ret = iscsit_execute_cmd(cmd, 0);
2336 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2337 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2339 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2343 return logout_remove;
2345 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2347 static int iscsit_handle_snack(
2348 struct iscsi_conn *conn,
2351 struct iscsi_snack *hdr;
2353 hdr = (struct iscsi_snack *) buf;
2354 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2356 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2357 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2358 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2359 hdr->begrun, hdr->runlength, conn->cid);
2361 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2362 pr_err("Initiator sent SNACK request while in"
2363 " ErrorRecoveryLevel=0.\n");
2364 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2368 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2369 * call from inside iscsi_send_recovery_datain_or_r2t().
2371 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2373 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2375 be32_to_cpu(hdr->ttt),
2376 be32_to_cpu(hdr->begrun),
2377 be32_to_cpu(hdr->runlength));
2378 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2379 return iscsit_handle_status_snack(conn, hdr->itt,
2380 be32_to_cpu(hdr->ttt),
2381 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2382 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2383 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2384 be32_to_cpu(hdr->begrun),
2385 be32_to_cpu(hdr->runlength));
2386 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2387 /* FIXME: Support R-Data SNACK */
2388 pr_err("R-Data SNACK Not Supported.\n");
2389 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2392 pr_err("Unknown SNACK type 0x%02x, protocol"
2393 " error.\n", hdr->flags & 0x0f);
2394 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2401 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2403 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2404 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2405 wait_for_completion_interruptible_timeout(
2406 &conn->rx_half_close_comp,
2407 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2411 static int iscsit_handle_immediate_data(
2412 struct iscsi_cmd *cmd,
2413 struct iscsi_scsi_req *hdr,
2416 int iov_ret, rx_got = 0, rx_size = 0;
2417 u32 checksum, iov_count = 0, padding = 0;
2418 struct iscsi_conn *conn = cmd->conn;
2421 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2423 return IMMEDIATE_DATA_CANNOT_RECOVER;
2426 iov_count = iov_ret;
2427 iov = &cmd->iov_data[0];
2429 padding = ((-length) & 3);
2431 iov[iov_count].iov_base = cmd->pad_bytes;
2432 iov[iov_count++].iov_len = padding;
2436 if (conn->conn_ops->DataDigest) {
2437 iov[iov_count].iov_base = &checksum;
2438 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2439 rx_size += ISCSI_CRC_LEN;
2442 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2444 iscsit_unmap_iovec(cmd);
2446 if (rx_got != rx_size) {
2447 iscsit_rx_thread_wait_for_tcp(conn);
2448 return IMMEDIATE_DATA_CANNOT_RECOVER;
2451 if (conn->conn_ops->DataDigest) {
2454 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2455 cmd->write_data_done, length, padding,
2458 if (checksum != data_crc) {
2459 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2460 " does not match computed 0x%08x\n", checksum,
2463 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2464 pr_err("Unable to recover from"
2465 " Immediate Data digest failure while"
2467 iscsit_reject_cmd(cmd,
2468 ISCSI_REASON_DATA_DIGEST_ERROR,
2469 (unsigned char *)hdr);
2470 return IMMEDIATE_DATA_CANNOT_RECOVER;
2472 iscsit_reject_cmd(cmd,
2473 ISCSI_REASON_DATA_DIGEST_ERROR,
2474 (unsigned char *)hdr);
2475 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2478 pr_debug("Got CRC32C DataDigest 0x%08x for"
2479 " %u bytes of Immediate Data\n", checksum,
2484 cmd->write_data_done += length;
2486 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2487 spin_lock_bh(&cmd->istate_lock);
2488 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2489 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2490 spin_unlock_bh(&cmd->istate_lock);
2493 return IMMEDIATE_DATA_NORMAL_OPERATION;
2497 * Called with sess->conn_lock held.
2499 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2500 with active network interface */
2501 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2503 struct iscsi_cmd *cmd;
2504 struct iscsi_conn *conn_p;
2508 * Only send a Asynchronous Message on connections whos network
2509 * interface is still functional.
2511 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2512 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2513 iscsit_inc_conn_usage_count(conn_p);
2522 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2524 iscsit_dec_conn_usage_count(conn_p);
2528 cmd->logout_cid = conn->cid;
2529 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2530 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2532 spin_lock_bh(&conn_p->cmd_lock);
2533 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2534 spin_unlock_bh(&conn_p->cmd_lock);
2536 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2537 iscsit_dec_conn_usage_count(conn_p);
2540 static int iscsit_send_conn_drop_async_message(
2541 struct iscsi_cmd *cmd,
2542 struct iscsi_conn *conn)
2544 struct iscsi_async *hdr;
2546 cmd->tx_size = ISCSI_HDR_LEN;
2547 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2549 hdr = (struct iscsi_async *) cmd->pdu;
2550 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2551 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2552 cmd->init_task_tag = RESERVED_ITT;
2553 cmd->targ_xfer_tag = 0xFFFFFFFF;
2554 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2555 cmd->stat_sn = conn->stat_sn++;
2556 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2557 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2558 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2559 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2560 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2561 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2562 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2564 if (conn->conn_ops->HeaderDigest) {
2565 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2567 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2568 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2570 cmd->tx_size += ISCSI_CRC_LEN;
2571 pr_debug("Attaching CRC32C HeaderDigest to"
2572 " Async Message 0x%08x\n", *header_digest);
2575 cmd->iov_misc[0].iov_base = cmd->pdu;
2576 cmd->iov_misc[0].iov_len = cmd->tx_size;
2577 cmd->iov_misc_count = 1;
2579 pr_debug("Sending Connection Dropped Async Message StatSN:"
2580 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2581 cmd->logout_cid, conn->cid);
2585 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2587 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2588 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2589 wait_for_completion_interruptible_timeout(
2590 &conn->tx_half_close_comp,
2591 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2596 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2597 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2600 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2601 hdr->flags = datain->flags;
2602 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2603 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2604 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2605 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2606 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2607 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2608 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2611 hton24(hdr->dlength, datain->length);
2612 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2613 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2614 (struct scsi_lun *)&hdr->lun);
2616 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2618 hdr->itt = cmd->init_task_tag;
2620 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2621 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2623 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2625 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2627 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2629 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2630 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2631 hdr->datasn = cpu_to_be32(datain->data_sn);
2632 hdr->offset = cpu_to_be32(datain->offset);
2634 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2635 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2636 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2637 ntohl(hdr->offset), datain->length, conn->cid);
2640 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2642 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2643 struct iscsi_datain datain;
2644 struct iscsi_datain_req *dr;
2646 u32 iov_count = 0, tx_size = 0;
2647 int eodr = 0, ret, iov_ret;
2648 bool set_statsn = false;
2650 memset(&datain, 0, sizeof(struct iscsi_datain));
2651 dr = iscsit_get_datain_values(cmd, &datain);
2653 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2654 cmd->init_task_tag);
2658 * Be paranoid and double check the logic for now.
2660 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2661 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2662 " datain.length: %u exceeds cmd->data_length: %u\n",
2663 cmd->init_task_tag, datain.offset, datain.length,
2664 cmd->se_cmd.data_length);
2668 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2670 * Special case for successfully execution w/ both DATAIN
2673 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2674 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2675 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2677 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2678 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2679 iscsit_increment_maxcmdsn(cmd, conn->sess);
2680 cmd->stat_sn = conn->stat_sn++;
2682 } else if (dr->dr_complete ==
2683 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2687 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2689 iov = &cmd->iov_data[0];
2690 iov[iov_count].iov_base = cmd->pdu;
2691 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2692 tx_size += ISCSI_HDR_LEN;
2694 if (conn->conn_ops->HeaderDigest) {
2695 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2697 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2698 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2700 iov[0].iov_len += ISCSI_CRC_LEN;
2701 tx_size += ISCSI_CRC_LEN;
2703 pr_debug("Attaching CRC32 HeaderDigest"
2704 " for DataIN PDU 0x%08x\n", *header_digest);
2707 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2708 datain.offset, datain.length);
2712 iov_count += iov_ret;
2713 tx_size += datain.length;
2715 cmd->padding = ((-datain.length) & 3);
2717 iov[iov_count].iov_base = cmd->pad_bytes;
2718 iov[iov_count++].iov_len = cmd->padding;
2719 tx_size += cmd->padding;
2721 pr_debug("Attaching %u padding bytes\n",
2724 if (conn->conn_ops->DataDigest) {
2725 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2726 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2728 iov[iov_count].iov_base = &cmd->data_crc;
2729 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2730 tx_size += ISCSI_CRC_LEN;
2732 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2733 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2736 cmd->iov_data_count = iov_count;
2737 cmd->tx_size = tx_size;
2739 /* sendpage is preferred but can't insert markers */
2740 if (!conn->conn_ops->IFMarker)
2741 ret = iscsit_fe_sendpage_sg(cmd, conn);
2743 ret = iscsit_send_tx_data(cmd, conn, 0);
2745 iscsit_unmap_iovec(cmd);
2748 iscsit_tx_thread_wait_for_tcp(conn);
2752 if (dr->dr_complete) {
2753 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2755 iscsit_free_datain_req(cmd, dr);
2762 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2763 struct iscsi_logout_rsp *hdr)
2765 struct iscsi_conn *logout_conn = NULL;
2766 struct iscsi_conn_recovery *cr = NULL;
2767 struct iscsi_session *sess = conn->sess;
2769 * The actual shutting down of Sessions and/or Connections
2770 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2771 * is done in scsi_logout_post_handler().
2773 switch (cmd->logout_reason) {
2774 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2775 pr_debug("iSCSI session logout successful, setting"
2776 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2777 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2779 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2780 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2783 * For CLOSECONNECTION logout requests carrying
2784 * a matching logout CID -> local CID, the reference
2785 * for the local CID will have been incremented in
2786 * iscsi_logout_closeconnection().
2788 * For CLOSECONNECTION logout requests carrying
2789 * a different CID than the connection it arrived
2790 * on, the connection responding to cmd->logout_cid
2791 * is stopped in iscsit_logout_post_handler_diffcid().
2794 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2795 " successful.\n", cmd->logout_cid, conn->cid);
2796 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2798 case ISCSI_LOGOUT_REASON_RECOVERY:
2799 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2800 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2803 * If the connection is still active from our point of view
2804 * force connection recovery to occur.
2806 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2809 iscsit_connection_reinstatement_rcfr(logout_conn);
2810 iscsit_dec_conn_usage_count(logout_conn);
2813 cr = iscsit_get_inactive_connection_recovery_entry(
2814 conn->sess, cmd->logout_cid);
2816 pr_err("Unable to locate CID: %hu for"
2817 " REMOVECONNFORRECOVERY Logout Request.\n",
2819 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2823 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2825 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2826 " for recovery for CID: %hu on CID: %hu successful.\n",
2827 cmd->logout_cid, conn->cid);
2828 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2831 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2832 cmd->logout_reason);
2836 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2837 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2838 hdr->response = cmd->logout_response;
2839 hdr->itt = cmd->init_task_tag;
2840 cmd->stat_sn = conn->stat_sn++;
2841 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2843 iscsit_increment_maxcmdsn(cmd, conn->sess);
2844 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2845 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2847 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2848 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2849 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2850 cmd->logout_cid, conn->cid);
2854 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2857 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2860 int niov = 0, tx_size, rc;
2862 rc = iscsit_build_logout_rsp(cmd, conn,
2863 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2867 tx_size = ISCSI_HDR_LEN;
2868 iov = &cmd->iov_misc[0];
2869 iov[niov].iov_base = cmd->pdu;
2870 iov[niov++].iov_len = ISCSI_HDR_LEN;
2872 if (conn->conn_ops->HeaderDigest) {
2873 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2875 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2876 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2878 iov[0].iov_len += ISCSI_CRC_LEN;
2879 tx_size += ISCSI_CRC_LEN;
2880 pr_debug("Attaching CRC32C HeaderDigest to"
2881 " Logout Response 0x%08x\n", *header_digest);
2883 cmd->iov_misc_count = niov;
2884 cmd->tx_size = tx_size;
2890 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2891 struct iscsi_nopin *hdr, bool nopout_response)
2893 hdr->opcode = ISCSI_OP_NOOP_IN;
2894 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2895 hton24(hdr->dlength, cmd->buf_ptr_size);
2896 if (nopout_response)
2897 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2898 hdr->itt = cmd->init_task_tag;
2899 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2900 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2902 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2904 if (nopout_response)
2905 iscsit_increment_maxcmdsn(cmd, conn->sess);
2907 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2908 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2910 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2911 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2912 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2913 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2915 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2918 * Unsolicited NOPIN, either requesting a response or not.
2920 static int iscsit_send_unsolicited_nopin(
2921 struct iscsi_cmd *cmd,
2922 struct iscsi_conn *conn,
2925 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2926 int tx_size = ISCSI_HDR_LEN, ret;
2928 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2930 if (conn->conn_ops->HeaderDigest) {
2931 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2933 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2934 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2936 tx_size += ISCSI_CRC_LEN;
2937 pr_debug("Attaching CRC32C HeaderDigest to"
2938 " NopIN 0x%08x\n", *header_digest);
2941 cmd->iov_misc[0].iov_base = cmd->pdu;
2942 cmd->iov_misc[0].iov_len = tx_size;
2943 cmd->iov_misc_count = 1;
2944 cmd->tx_size = tx_size;
2946 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2947 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2949 ret = iscsit_send_tx_data(cmd, conn, 1);
2951 iscsit_tx_thread_wait_for_tcp(conn);
2955 spin_lock_bh(&cmd->istate_lock);
2956 cmd->i_state = want_response ?
2957 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2958 spin_unlock_bh(&cmd->istate_lock);
2964 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2966 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2969 int niov = 0, tx_size;
2971 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2973 tx_size = ISCSI_HDR_LEN;
2974 iov = &cmd->iov_misc[0];
2975 iov[niov].iov_base = cmd->pdu;
2976 iov[niov++].iov_len = ISCSI_HDR_LEN;
2978 if (conn->conn_ops->HeaderDigest) {
2979 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2981 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2982 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2984 iov[0].iov_len += ISCSI_CRC_LEN;
2985 tx_size += ISCSI_CRC_LEN;
2986 pr_debug("Attaching CRC32C HeaderDigest"
2987 " to NopIn 0x%08x\n", *header_digest);
2991 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2992 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2994 if (cmd->buf_ptr_size) {
2995 iov[niov].iov_base = cmd->buf_ptr;
2996 iov[niov++].iov_len = cmd->buf_ptr_size;
2997 tx_size += cmd->buf_ptr_size;
2999 pr_debug("Echoing back %u bytes of ping"
3000 " data.\n", cmd->buf_ptr_size);
3002 padding = ((-cmd->buf_ptr_size) & 3);
3004 iov[niov].iov_base = &cmd->pad_bytes;
3005 iov[niov++].iov_len = padding;
3007 pr_debug("Attaching %u additional"
3008 " padding bytes.\n", padding);
3010 if (conn->conn_ops->DataDigest) {
3011 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3012 cmd->buf_ptr, cmd->buf_ptr_size,
3013 padding, (u8 *)&cmd->pad_bytes,
3014 (u8 *)&cmd->data_crc);
3016 iov[niov].iov_base = &cmd->data_crc;
3017 iov[niov++].iov_len = ISCSI_CRC_LEN;
3018 tx_size += ISCSI_CRC_LEN;
3019 pr_debug("Attached DataDigest for %u"
3020 " bytes of ping data, CRC 0x%08x\n",
3021 cmd->buf_ptr_size, cmd->data_crc);
3025 cmd->iov_misc_count = niov;
3026 cmd->tx_size = tx_size;
3031 static int iscsit_send_r2t(
3032 struct iscsi_cmd *cmd,
3033 struct iscsi_conn *conn)
3036 struct iscsi_r2t *r2t;
3037 struct iscsi_r2t_rsp *hdr;
3040 r2t = iscsit_get_r2t_from_list(cmd);
3044 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3045 memset(hdr, 0, ISCSI_HDR_LEN);
3046 hdr->opcode = ISCSI_OP_R2T;
3047 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3048 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3049 (struct scsi_lun *)&hdr->lun);
3050 hdr->itt = cmd->init_task_tag;
3051 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3052 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3053 hdr->statsn = cpu_to_be32(conn->stat_sn);
3054 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3055 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3056 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3057 hdr->data_offset = cpu_to_be32(r2t->offset);
3058 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3060 cmd->iov_misc[0].iov_base = cmd->pdu;
3061 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3062 tx_size += ISCSI_HDR_LEN;
3064 if (conn->conn_ops->HeaderDigest) {
3065 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3067 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3068 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3070 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3071 tx_size += ISCSI_CRC_LEN;
3072 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3073 " PDU 0x%08x\n", *header_digest);
3076 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3077 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3078 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3079 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3080 r2t->offset, r2t->xfer_len, conn->cid);
3082 cmd->iov_misc_count = 1;
3083 cmd->tx_size = tx_size;
3085 spin_lock_bh(&cmd->r2t_lock);
3087 spin_unlock_bh(&cmd->r2t_lock);
3089 ret = iscsit_send_tx_data(cmd, conn, 1);
3091 iscsit_tx_thread_wait_for_tcp(conn);
3095 spin_lock_bh(&cmd->dataout_timeout_lock);
3096 iscsit_start_dataout_timer(cmd, conn);
3097 spin_unlock_bh(&cmd->dataout_timeout_lock);
3103 * @recovery: If called from iscsi_task_reassign_complete_write() for
3104 * connection recovery.
3106 int iscsit_build_r2ts_for_cmd(
3107 struct iscsi_conn *conn,
3108 struct iscsi_cmd *cmd,
3112 u32 offset = 0, xfer_len = 0;
3114 spin_lock_bh(&cmd->r2t_lock);
3115 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3116 spin_unlock_bh(&cmd->r2t_lock);
3120 if (conn->sess->sess_ops->DataSequenceInOrder &&
3122 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3124 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3125 if (conn->sess->sess_ops->DataSequenceInOrder) {
3126 offset = cmd->r2t_offset;
3128 if (first_r2t && recovery) {
3129 int new_data_end = offset +
3130 conn->sess->sess_ops->MaxBurstLength -
3131 cmd->next_burst_len;
3133 if (new_data_end > cmd->se_cmd.data_length)
3134 xfer_len = cmd->se_cmd.data_length - offset;
3137 conn->sess->sess_ops->MaxBurstLength -
3138 cmd->next_burst_len;
3140 int new_data_end = offset +
3141 conn->sess->sess_ops->MaxBurstLength;
3143 if (new_data_end > cmd->se_cmd.data_length)
3144 xfer_len = cmd->se_cmd.data_length - offset;
3146 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3148 cmd->r2t_offset += xfer_len;
3150 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3151 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153 struct iscsi_seq *seq;
3155 seq = iscsit_get_seq_holder_for_r2t(cmd);
3157 spin_unlock_bh(&cmd->r2t_lock);
3161 offset = seq->offset;
3162 xfer_len = seq->xfer_len;
3164 if (cmd->seq_send_order == cmd->seq_count)
3165 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3167 cmd->outstanding_r2ts++;
3170 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3171 spin_unlock_bh(&cmd->r2t_lock);
3175 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3178 spin_unlock_bh(&cmd->r2t_lock);
3183 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3184 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3187 cmd->stat_sn = conn->stat_sn++;
3189 atomic_long_inc(&conn->sess->rsp_pdus);
3191 memset(hdr, 0, ISCSI_HDR_LEN);
3192 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3193 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3194 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3195 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3196 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3197 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3198 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3199 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3201 hdr->response = cmd->iscsi_response;
3202 hdr->cmd_status = cmd->se_cmd.scsi_status;
3203 hdr->itt = cmd->init_task_tag;
3204 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3206 iscsit_increment_maxcmdsn(cmd, conn->sess);
3207 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3208 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3210 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3211 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3212 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3213 cmd->se_cmd.scsi_status, conn->cid);
3215 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3217 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3219 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3221 u32 padding = 0, tx_size = 0;
3223 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3225 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3227 iov = &cmd->iov_misc[0];
3228 iov[iov_count].iov_base = cmd->pdu;
3229 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3230 tx_size += ISCSI_HDR_LEN;
3233 * Attach SENSE DATA payload to iSCSI Response PDU
3235 if (cmd->se_cmd.sense_buffer &&
3236 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3237 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3238 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3239 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3241 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3242 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3243 iov[iov_count].iov_base = cmd->sense_buffer;
3244 iov[iov_count++].iov_len =
3245 (cmd->se_cmd.scsi_sense_length + padding);
3246 tx_size += cmd->se_cmd.scsi_sense_length;
3249 memset(cmd->sense_buffer +
3250 cmd->se_cmd.scsi_sense_length, 0, padding);
3252 pr_debug("Adding %u bytes of padding to"
3253 " SENSE.\n", padding);
3256 if (conn->conn_ops->DataDigest) {
3257 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3259 (cmd->se_cmd.scsi_sense_length + padding),
3260 0, NULL, (u8 *)&cmd->data_crc);
3262 iov[iov_count].iov_base = &cmd->data_crc;
3263 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3264 tx_size += ISCSI_CRC_LEN;
3266 pr_debug("Attaching CRC32 DataDigest for"
3267 " SENSE, %u bytes CRC 0x%08x\n",
3268 (cmd->se_cmd.scsi_sense_length + padding),
3272 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3274 cmd->se_cmd.scsi_sense_length);
3277 if (conn->conn_ops->HeaderDigest) {
3278 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3280 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3281 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3283 iov[0].iov_len += ISCSI_CRC_LEN;
3284 tx_size += ISCSI_CRC_LEN;
3285 pr_debug("Attaching CRC32 HeaderDigest for Response"
3286 " PDU 0x%08x\n", *header_digest);
3289 cmd->iov_misc_count = iov_count;
3290 cmd->tx_size = tx_size;
3295 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3297 switch (se_tmr->response) {
3298 case TMR_FUNCTION_COMPLETE:
3299 return ISCSI_TMF_RSP_COMPLETE;
3300 case TMR_TASK_DOES_NOT_EXIST:
3301 return ISCSI_TMF_RSP_NO_TASK;
3302 case TMR_LUN_DOES_NOT_EXIST:
3303 return ISCSI_TMF_RSP_NO_LUN;
3304 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3305 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3306 case TMR_FUNCTION_REJECTED:
3308 return ISCSI_TMF_RSP_REJECTED;
3313 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3314 struct iscsi_tm_rsp *hdr)
3316 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3318 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3319 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3320 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3321 hdr->itt = cmd->init_task_tag;
3322 cmd->stat_sn = conn->stat_sn++;
3323 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3325 iscsit_increment_maxcmdsn(cmd, conn->sess);
3326 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3327 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3329 pr_debug("Built Task Management Response ITT: 0x%08x,"
3330 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3331 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3333 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3336 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3338 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3341 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3343 cmd->iov_misc[0].iov_base = cmd->pdu;
3344 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3345 tx_size += ISCSI_HDR_LEN;
3347 if (conn->conn_ops->HeaderDigest) {
3348 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3350 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3351 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3353 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3354 tx_size += ISCSI_CRC_LEN;
3355 pr_debug("Attaching CRC32 HeaderDigest for Task"
3356 " Mgmt Response PDU 0x%08x\n", *header_digest);
3359 cmd->iov_misc_count = 1;
3360 cmd->tx_size = tx_size;
3365 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3369 if (np->np_sockaddr.ss_family == AF_INET6) {
3370 const struct sockaddr_in6 sin6 = {
3371 .sin6_addr = IN6ADDR_ANY_INIT };
3372 struct sockaddr_in6 *sock_in6 =
3373 (struct sockaddr_in6 *)&np->np_sockaddr;
3375 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3376 sin6.sin6_addr.s6_addr, 16))
3379 struct sockaddr_in * sock_in =
3380 (struct sockaddr_in *)&np->np_sockaddr;
3382 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3389 #define SENDTARGETS_BUF_LIMIT 32768U
3392 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3393 enum iscsit_transport_type network_transport,
3394 int skip_bytes, bool *completed)
3396 char *payload = NULL;
3397 struct iscsi_conn *conn = cmd->conn;
3398 struct iscsi_portal_group *tpg;
3399 struct iscsi_tiqn *tiqn;
3400 struct iscsi_tpg_np *tpg_np;
3401 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3402 int target_name_printed;
3403 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3404 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3406 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3407 SENDTARGETS_BUF_LIMIT);
3409 payload = kzalloc(buffer_len, GFP_KERNEL);
3411 pr_err("Unable to allocate memory for sendtargets"
3416 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3419 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3420 text_ptr = strchr(text_in, '=');
3422 pr_err("Unable to locate '=' string in text_in:"
3428 * Skip over '=' character..
3433 spin_lock(&tiqn_lock);
3434 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3435 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3436 strcmp(tiqn->tiqn, text_ptr)) {
3440 target_name_printed = 0;
3442 spin_lock(&tiqn->tiqn_tpg_lock);
3443 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3445 /* If demo_mode_discovery=0 and generate_node_acls=0
3446 * (demo mode dislabed) do not return
3447 * TargetName+TargetAddress unless a NodeACL exists.
3450 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3451 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3452 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3453 cmd->conn->sess->sess_ops->InitiatorName))) {
3457 spin_lock(&tpg->tpg_state_lock);
3458 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3459 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3460 spin_unlock(&tpg->tpg_state_lock);
3463 spin_unlock(&tpg->tpg_state_lock);
3465 spin_lock(&tpg->tpg_np_lock);
3466 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3468 struct iscsi_np *np = tpg_np->tpg_np;
3469 bool inaddr_any = iscsit_check_inaddr_any(np);
3472 if (np->np_network_transport != network_transport)
3475 if (!target_name_printed) {
3476 len = sprintf(buf, "TargetName=%s",
3480 if ((len + payload_len) > buffer_len) {
3481 spin_unlock(&tpg->tpg_np_lock);
3482 spin_unlock(&tiqn->tiqn_tpg_lock);
3487 if (skip_bytes && len <= skip_bytes) {
3490 memcpy(payload + payload_len, buf, len);
3492 target_name_printed = 1;
3493 if (len > skip_bytes)
3498 if (np->np_sockaddr.ss_family == AF_INET6)
3499 fmt_str = "TargetAddress=[%s]:%hu,%hu";
3501 fmt_str = "TargetAddress=%s:%hu,%hu";
3503 len = sprintf(buf, fmt_str,
3504 inaddr_any ? conn->local_ip : np->np_ip,
3509 if ((len + payload_len) > buffer_len) {
3510 spin_unlock(&tpg->tpg_np_lock);
3511 spin_unlock(&tiqn->tiqn_tpg_lock);
3516 if (skip_bytes && len <= skip_bytes) {
3519 memcpy(payload + payload_len, buf, len);
3521 if (len > skip_bytes)
3525 spin_unlock(&tpg->tpg_np_lock);
3527 spin_unlock(&tiqn->tiqn_tpg_lock);
3534 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3537 spin_unlock(&tiqn_lock);
3539 cmd->buf_ptr = payload;
3545 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3546 struct iscsi_text_rsp *hdr,
3547 enum iscsit_transport_type network_transport)
3549 int text_length, padding;
3550 bool completed = true;
3552 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3553 cmd->read_data_done,
3555 if (text_length < 0)
3559 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3561 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3562 cmd->read_data_done += text_length;
3563 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3564 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3566 hdr->opcode = ISCSI_OP_TEXT_RSP;
3567 padding = ((-text_length) & 3);
3568 hton24(hdr->dlength, text_length);
3569 hdr->itt = cmd->init_task_tag;
3570 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3571 cmd->stat_sn = conn->stat_sn++;
3572 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3574 iscsit_increment_maxcmdsn(cmd, conn->sess);
3576 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3577 * correctly increment MaxCmdSN for each response answering a
3578 * non immediate text request with a valid CmdSN.
3580 cmd->maxcmdsn_inc = 0;
3581 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3582 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3584 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3585 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3586 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3587 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3588 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3590 return text_length + padding;
3592 EXPORT_SYMBOL(iscsit_build_text_rsp);
3594 static int iscsit_send_text_rsp(
3595 struct iscsi_cmd *cmd,
3596 struct iscsi_conn *conn)
3598 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3601 int text_length, iov_count = 0, rc;
3603 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3608 iov = &cmd->iov_misc[0];
3609 iov[iov_count].iov_base = cmd->pdu;
3610 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3611 iov[iov_count].iov_base = cmd->buf_ptr;
3612 iov[iov_count++].iov_len = text_length;
3614 tx_size += (ISCSI_HDR_LEN + text_length);
3616 if (conn->conn_ops->HeaderDigest) {
3617 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3619 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3620 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3622 iov[0].iov_len += ISCSI_CRC_LEN;
3623 tx_size += ISCSI_CRC_LEN;
3624 pr_debug("Attaching CRC32 HeaderDigest for"
3625 " Text Response PDU 0x%08x\n", *header_digest);
3628 if (conn->conn_ops->DataDigest) {
3629 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3630 cmd->buf_ptr, text_length,
3631 0, NULL, (u8 *)&cmd->data_crc);
3633 iov[iov_count].iov_base = &cmd->data_crc;
3634 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3635 tx_size += ISCSI_CRC_LEN;
3637 pr_debug("Attaching DataDigest for %u bytes of text"
3638 " data, CRC 0x%08x\n", text_length,
3642 cmd->iov_misc_count = iov_count;
3643 cmd->tx_size = tx_size;
3649 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3650 struct iscsi_reject *hdr)
3652 hdr->opcode = ISCSI_OP_REJECT;
3653 hdr->reason = cmd->reject_reason;
3654 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3655 hton24(hdr->dlength, ISCSI_HDR_LEN);
3656 hdr->ffffffff = cpu_to_be32(0xffffffff);
3657 cmd->stat_sn = conn->stat_sn++;
3658 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3659 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3660 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3663 EXPORT_SYMBOL(iscsit_build_reject);
3665 static int iscsit_send_reject(
3666 struct iscsi_cmd *cmd,
3667 struct iscsi_conn *conn)
3669 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3671 u32 iov_count = 0, tx_size;
3673 iscsit_build_reject(cmd, conn, hdr);
3675 iov = &cmd->iov_misc[0];
3676 iov[iov_count].iov_base = cmd->pdu;
3677 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3678 iov[iov_count].iov_base = cmd->buf_ptr;
3679 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3681 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3683 if (conn->conn_ops->HeaderDigest) {
3684 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3686 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3687 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3689 iov[0].iov_len += ISCSI_CRC_LEN;
3690 tx_size += ISCSI_CRC_LEN;
3691 pr_debug("Attaching CRC32 HeaderDigest for"
3692 " REJECT PDU 0x%08x\n", *header_digest);
3695 if (conn->conn_ops->DataDigest) {
3696 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3697 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3699 iov[iov_count].iov_base = &cmd->data_crc;
3700 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3701 tx_size += ISCSI_CRC_LEN;
3702 pr_debug("Attaching CRC32 DataDigest for REJECT"
3703 " PDU 0x%08x\n", cmd->data_crc);
3706 cmd->iov_misc_count = iov_count;
3707 cmd->tx_size = tx_size;
3709 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3710 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3715 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3719 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3720 * within iscsit_start_kthreads()
3722 * Here we use bitmap_id to determine which CPU that this
3723 * iSCSI connection's RX/TX threads will be scheduled to
3726 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3727 for_each_online_cpu(cpu) {
3729 cpumask_set_cpu(cpu, conn->conn_cpumask);
3734 * This should never be reached..
3737 cpumask_setall(conn->conn_cpumask);
3740 static inline void iscsit_thread_check_cpumask(
3741 struct iscsi_conn *conn,
3742 struct task_struct *p,
3746 * mode == 1 signals iscsi_target_tx_thread() usage.
3747 * mode == 0 signals iscsi_target_rx_thread() usage.
3750 if (!conn->conn_tx_reset_cpumask)
3752 conn->conn_tx_reset_cpumask = 0;
3754 if (!conn->conn_rx_reset_cpumask)
3756 conn->conn_rx_reset_cpumask = 0;
3759 * Update the CPU mask for this single kthread so that
3760 * both TX and RX kthreads are scheduled to run on the
3763 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3767 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3772 case ISTATE_SEND_R2T:
3773 ret = iscsit_send_r2t(cmd, conn);
3778 spin_lock_bh(&conn->cmd_lock);
3779 list_del_init(&cmd->i_conn_node);
3780 spin_unlock_bh(&conn->cmd_lock);
3782 iscsit_free_cmd(cmd, false);
3784 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3785 iscsit_mod_nopin_response_timer(conn);
3786 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3790 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3791 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3796 pr_err("Unknown Opcode: 0x%02x ITT:"
3797 " 0x%08x, i_state: %d on CID: %hu\n",
3798 cmd->iscsi_opcode, cmd->init_task_tag, state,
3810 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3812 struct iscsit_transport *t = conn->conn_transport;
3813 struct iscsi_queue_req *qr;
3814 struct iscsi_cmd *cmd;
3818 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3819 atomic_set(&conn->check_immediate_queue, 0);
3822 kmem_cache_free(lio_qr_cache, qr);
3824 ret = t->iscsit_immediate_queue(conn, cmd, state);
3833 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3839 case ISTATE_SEND_DATAIN:
3840 ret = iscsit_send_datain(cmd, conn);
3845 goto check_rsp_state;
3846 else if (ret == 1) {
3848 spin_lock_bh(&cmd->istate_lock);
3849 cmd->i_state = ISTATE_SENT_STATUS;
3850 spin_unlock_bh(&cmd->istate_lock);
3852 if (atomic_read(&conn->check_immediate_queue))
3856 } else if (ret == 2) {
3857 /* Still must send status,
3858 SCF_TRANSPORT_TASK_SENSE was set */
3859 spin_lock_bh(&cmd->istate_lock);
3860 cmd->i_state = ISTATE_SEND_STATUS;
3861 spin_unlock_bh(&cmd->istate_lock);
3862 state = ISTATE_SEND_STATUS;
3863 goto check_rsp_state;
3867 case ISTATE_SEND_STATUS:
3868 case ISTATE_SEND_STATUS_RECOVERY:
3869 ret = iscsit_send_response(cmd, conn);
3871 case ISTATE_SEND_LOGOUTRSP:
3872 ret = iscsit_send_logout(cmd, conn);
3874 case ISTATE_SEND_ASYNCMSG:
3875 ret = iscsit_send_conn_drop_async_message(
3878 case ISTATE_SEND_NOPIN:
3879 ret = iscsit_send_nopin(cmd, conn);
3881 case ISTATE_SEND_REJECT:
3882 ret = iscsit_send_reject(cmd, conn);
3884 case ISTATE_SEND_TASKMGTRSP:
3885 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3888 ret = iscsit_tmr_post_handler(cmd, conn);
3890 iscsit_fall_back_to_erl0(conn->sess);
3892 case ISTATE_SEND_TEXTRSP:
3893 ret = iscsit_send_text_rsp(cmd, conn);
3896 pr_err("Unknown Opcode: 0x%02x ITT:"
3897 " 0x%08x, i_state: %d on CID: %hu\n",
3898 cmd->iscsi_opcode, cmd->init_task_tag,
3905 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3906 iscsit_tx_thread_wait_for_tcp(conn);
3907 iscsit_unmap_iovec(cmd);
3910 iscsit_unmap_iovec(cmd);
3913 case ISTATE_SEND_LOGOUTRSP:
3914 if (!iscsit_logout_post_handler(cmd, conn))
3917 case ISTATE_SEND_STATUS:
3918 case ISTATE_SEND_ASYNCMSG:
3919 case ISTATE_SEND_NOPIN:
3920 case ISTATE_SEND_STATUS_RECOVERY:
3921 case ISTATE_SEND_TEXTRSP:
3922 case ISTATE_SEND_TASKMGTRSP:
3923 case ISTATE_SEND_REJECT:
3924 spin_lock_bh(&cmd->istate_lock);
3925 cmd->i_state = ISTATE_SENT_STATUS;
3926 spin_unlock_bh(&cmd->istate_lock);
3929 pr_err("Unknown Opcode: 0x%02x ITT:"
3930 " 0x%08x, i_state: %d on CID: %hu\n",
3931 cmd->iscsi_opcode, cmd->init_task_tag,
3932 cmd->i_state, conn->cid);
3936 if (atomic_read(&conn->check_immediate_queue))
3945 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3947 struct iscsit_transport *t = conn->conn_transport;
3948 struct iscsi_queue_req *qr;
3949 struct iscsi_cmd *cmd;
3953 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3956 kmem_cache_free(lio_qr_cache, qr);
3958 ret = t->iscsit_response_queue(conn, cmd, state);
3959 if (ret == 1 || ret < 0)
3966 int iscsi_target_tx_thread(void *arg)
3969 struct iscsi_conn *conn = arg;
3971 * Allow ourselves to be interrupted by SIGINT so that a
3972 * connection recovery / failure event can be triggered externally.
3974 allow_signal(SIGINT);
3976 while (!kthread_should_stop()) {
3978 * Ensure that both TX and RX per connection kthreads
3979 * are scheduled to run on the same CPU.
3981 iscsit_thread_check_cpumask(conn, current, 1);
3983 wait_event_interruptible(conn->queues_wq,
3984 !iscsit_conn_all_queues_empty(conn));
3986 if (signal_pending(current))
3990 ret = iscsit_handle_immediate_queue(conn);
3994 ret = iscsit_handle_response_queue(conn);
3997 else if (ret == -ECONNRESET)
4004 iscsit_take_action_for_connection_exit(conn);
4009 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4011 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4012 struct iscsi_cmd *cmd;
4015 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4016 case ISCSI_OP_SCSI_CMD:
4017 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4021 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4023 case ISCSI_OP_SCSI_DATA_OUT:
4024 ret = iscsit_handle_data_out(conn, buf);
4026 case ISCSI_OP_NOOP_OUT:
4028 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4029 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4033 ret = iscsit_handle_nop_out(conn, cmd, buf);
4035 case ISCSI_OP_SCSI_TMFUNC:
4036 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4040 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4043 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4044 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4048 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4053 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4055 case ISCSI_OP_LOGOUT:
4056 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4060 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4062 wait_for_completion_timeout(&conn->conn_logout_comp,
4063 SECONDS_FOR_LOGOUT_COMP * HZ);
4065 case ISCSI_OP_SNACK:
4066 ret = iscsit_handle_snack(conn, buf);
4069 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4070 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4071 pr_err("Cannot recover from unknown"
4072 " opcode while ERL=0, closing iSCSI connection.\n");
4075 if (!conn->conn_ops->OFMarker) {
4076 pr_err("Unable to recover from unknown"
4077 " opcode while OFMarker=No, closing iSCSI"
4081 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4082 pr_err("Unable to recover from unknown"
4083 " opcode, closing iSCSI connection.\n");
4091 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4094 int iscsi_target_rx_thread(void *arg)
4097 u8 buffer[ISCSI_HDR_LEN], opcode;
4098 u32 checksum = 0, digest = 0;
4099 struct iscsi_conn *conn = arg;
4102 * Allow ourselves to be interrupted by SIGINT so that a
4103 * connection recovery / failure event can be triggered externally.
4105 allow_signal(SIGINT);
4107 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4108 struct completion comp;
4111 init_completion(&comp);
4112 rc = wait_for_completion_interruptible(&comp);
4119 while (!kthread_should_stop()) {
4121 * Ensure that both TX and RX per connection kthreads
4122 * are scheduled to run on the same CPU.
4124 iscsit_thread_check_cpumask(conn, current, 0);
4126 memset(buffer, 0, ISCSI_HDR_LEN);
4127 memset(&iov, 0, sizeof(struct kvec));
4129 iov.iov_base = buffer;
4130 iov.iov_len = ISCSI_HDR_LEN;
4132 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4133 if (ret != ISCSI_HDR_LEN) {
4134 iscsit_rx_thread_wait_for_tcp(conn);
4138 if (conn->conn_ops->HeaderDigest) {
4139 iov.iov_base = &digest;
4140 iov.iov_len = ISCSI_CRC_LEN;
4142 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4143 if (ret != ISCSI_CRC_LEN) {
4144 iscsit_rx_thread_wait_for_tcp(conn);
4148 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4149 buffer, ISCSI_HDR_LEN,
4150 0, NULL, (u8 *)&checksum);
4152 if (digest != checksum) {
4153 pr_err("HeaderDigest CRC32C failed,"
4154 " received 0x%08x, computed 0x%08x\n",
4157 * Set the PDU to 0xff so it will intentionally
4158 * hit default in the switch below.
4160 memset(buffer, 0xff, ISCSI_HDR_LEN);
4161 atomic_long_inc(&conn->sess->conn_digest_errors);
4163 pr_debug("Got HeaderDigest CRC32C"
4164 " 0x%08x\n", checksum);
4168 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4171 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4173 if (conn->sess->sess_ops->SessionType &&
4174 ((!(opcode & ISCSI_OP_TEXT)) ||
4175 (!(opcode & ISCSI_OP_LOGOUT)))) {
4176 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4177 " while in Discovery Session, rejecting.\n", opcode);
4178 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4183 ret = iscsi_target_rx_opcode(conn, buffer);
4189 if (!signal_pending(current))
4190 atomic_set(&conn->transport_failed, 1);
4191 iscsit_take_action_for_connection_exit(conn);
4195 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4197 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4198 struct iscsi_session *sess = conn->sess;
4200 * We expect this function to only ever be called from either RX or TX
4201 * thread context via iscsit_close_connection() once the other context
4202 * has been reset -> returned sleeping pre-handler state.
4204 spin_lock_bh(&conn->cmd_lock);
4205 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4207 list_del_init(&cmd->i_conn_node);
4208 spin_unlock_bh(&conn->cmd_lock);
4210 iscsit_increment_maxcmdsn(cmd, sess);
4212 iscsit_free_cmd(cmd, true);
4214 spin_lock_bh(&conn->cmd_lock);
4216 spin_unlock_bh(&conn->cmd_lock);
4219 static void iscsit_stop_timers_for_cmds(
4220 struct iscsi_conn *conn)
4222 struct iscsi_cmd *cmd;
4224 spin_lock_bh(&conn->cmd_lock);
4225 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4226 if (cmd->data_direction == DMA_TO_DEVICE)
4227 iscsit_stop_dataout_timer(cmd);
4229 spin_unlock_bh(&conn->cmd_lock);
4232 int iscsit_close_connection(
4233 struct iscsi_conn *conn)
4235 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4236 struct iscsi_session *sess = conn->sess;
4238 pr_debug("Closing iSCSI connection CID %hu on SID:"
4239 " %u\n", conn->cid, sess->sid);
4241 * Always up conn_logout_comp for the traditional TCP case just in case
4242 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4243 * response never got sent because the connection failed.
4245 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4246 * to signal logout response TX interrupt completion. Go ahead and skip
4247 * this for iser since isert_rx_opcode() does not wait on logout failure,
4248 * and to avoid iscsi_conn pointer dereference in iser-target code.
4250 if (conn->conn_transport->transport_type == ISCSI_TCP)
4251 complete(&conn->conn_logout_comp);
4253 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4254 if (conn->tx_thread &&
4255 cmpxchg(&conn->tx_thread_active, true, false)) {
4256 send_sig(SIGINT, conn->tx_thread, 1);
4257 kthread_stop(conn->tx_thread);
4259 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4260 if (conn->rx_thread &&
4261 cmpxchg(&conn->rx_thread_active, true, false)) {
4262 send_sig(SIGINT, conn->rx_thread, 1);
4263 kthread_stop(conn->rx_thread);
4267 spin_lock(&iscsit_global->ts_bitmap_lock);
4268 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4270 spin_unlock(&iscsit_global->ts_bitmap_lock);
4272 iscsit_stop_timers_for_cmds(conn);
4273 iscsit_stop_nopin_response_timer(conn);
4274 iscsit_stop_nopin_timer(conn);
4276 if (conn->conn_transport->iscsit_wait_conn)
4277 conn->conn_transport->iscsit_wait_conn(conn);
4280 * During Connection recovery drop unacknowledged out of order
4281 * commands for this connection, and prepare the other commands
4284 * During normal operation clear the out of order commands (but
4285 * do not free the struct iscsi_ooo_cmdsn's) and release all
4286 * struct iscsi_cmds.
4288 if (atomic_read(&conn->connection_recovery)) {
4289 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4290 iscsit_prepare_cmds_for_realligance(conn);
4292 iscsit_clear_ooo_cmdsns_for_conn(conn);
4293 iscsit_release_commands_from_conn(conn);
4295 iscsit_free_queue_reqs_for_conn(conn);
4298 * Handle decrementing session or connection usage count if
4299 * a logout response was not able to be sent because the
4300 * connection failed. Fall back to Session Recovery here.
4302 if (atomic_read(&conn->conn_logout_remove)) {
4303 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4304 iscsit_dec_conn_usage_count(conn);
4305 iscsit_dec_session_usage_count(sess);
4307 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4308 iscsit_dec_conn_usage_count(conn);
4310 atomic_set(&conn->conn_logout_remove, 0);
4311 atomic_set(&sess->session_reinstatement, 0);
4312 atomic_set(&sess->session_fall_back_to_erl0, 1);
4315 spin_lock_bh(&sess->conn_lock);
4316 list_del(&conn->conn_list);
4319 * Attempt to let the Initiator know this connection failed by
4320 * sending an Connection Dropped Async Message on another
4321 * active connection.
4323 if (atomic_read(&conn->connection_recovery))
4324 iscsit_build_conn_drop_async_message(conn);
4326 spin_unlock_bh(&sess->conn_lock);
4329 * If connection reinstatement is being performed on this connection,
4330 * up the connection reinstatement semaphore that is being blocked on
4331 * in iscsit_cause_connection_reinstatement().
4333 spin_lock_bh(&conn->state_lock);
4334 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4335 spin_unlock_bh(&conn->state_lock);
4336 complete(&conn->conn_wait_comp);
4337 wait_for_completion(&conn->conn_post_wait_comp);
4338 spin_lock_bh(&conn->state_lock);
4342 * If connection reinstatement is being performed on this connection
4343 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4344 * connection wait rcfr semaphore that is being blocked on
4345 * an iscsit_connection_reinstatement_rcfr().
4347 if (atomic_read(&conn->connection_wait_rcfr)) {
4348 spin_unlock_bh(&conn->state_lock);
4349 complete(&conn->conn_wait_rcfr_comp);
4350 wait_for_completion(&conn->conn_post_wait_comp);
4351 spin_lock_bh(&conn->state_lock);
4353 atomic_set(&conn->connection_reinstatement, 1);
4354 spin_unlock_bh(&conn->state_lock);
4357 * If any other processes are accessing this connection pointer we
4358 * must wait until they have completed.
4360 iscsit_check_conn_usage_count(conn);
4362 if (conn->conn_rx_hash.tfm)
4363 crypto_free_hash(conn->conn_rx_hash.tfm);
4364 if (conn->conn_tx_hash.tfm)
4365 crypto_free_hash(conn->conn_tx_hash.tfm);
4367 free_cpumask_var(conn->conn_cpumask);
4369 kfree(conn->conn_ops);
4370 conn->conn_ops = NULL;
4373 sock_release(conn->sock);
4375 if (conn->conn_transport->iscsit_free_conn)
4376 conn->conn_transport->iscsit_free_conn(conn);
4378 iscsit_put_transport(conn->conn_transport);
4380 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4381 conn->conn_state = TARG_CONN_STATE_FREE;
4384 spin_lock_bh(&sess->conn_lock);
4385 atomic_dec(&sess->nconn);
4386 pr_debug("Decremented iSCSI connection count to %hu from node:"
4387 " %s\n", atomic_read(&sess->nconn),
4388 sess->sess_ops->InitiatorName);
4390 * Make sure that if one connection fails in an non ERL=2 iSCSI
4391 * Session that they all fail.
4393 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4394 !atomic_read(&sess->session_logout))
4395 atomic_set(&sess->session_fall_back_to_erl0, 1);
4398 * If this was not the last connection in the session, and we are
4399 * performing session reinstatement or falling back to ERL=0, call
4400 * iscsit_stop_session() without sleeping to shutdown the other
4401 * active connections.
4403 if (atomic_read(&sess->nconn)) {
4404 if (!atomic_read(&sess->session_reinstatement) &&
4405 !atomic_read(&sess->session_fall_back_to_erl0)) {
4406 spin_unlock_bh(&sess->conn_lock);
4409 if (!atomic_read(&sess->session_stop_active)) {
4410 atomic_set(&sess->session_stop_active, 1);
4411 spin_unlock_bh(&sess->conn_lock);
4412 iscsit_stop_session(sess, 0, 0);
4415 spin_unlock_bh(&sess->conn_lock);
4420 * If this was the last connection in the session and one of the
4421 * following is occurring:
4423 * Session Reinstatement is not being performed, and are falling back
4424 * to ERL=0 call iscsit_close_session().
4426 * Session Logout was requested. iscsit_close_session() will be called
4429 * Session Continuation is not being performed, start the Time2Retain
4430 * handler and check if sleep_on_sess_wait_sem is active.
4432 if (!atomic_read(&sess->session_reinstatement) &&
4433 atomic_read(&sess->session_fall_back_to_erl0)) {
4434 spin_unlock_bh(&sess->conn_lock);
4435 target_put_session(sess->se_sess);
4438 } else if (atomic_read(&sess->session_logout)) {
4439 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4440 sess->session_state = TARG_SESS_STATE_FREE;
4441 spin_unlock_bh(&sess->conn_lock);
4443 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4444 complete(&sess->session_wait_comp);
4448 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4449 sess->session_state = TARG_SESS_STATE_FAILED;
4451 if (!atomic_read(&sess->session_continuation)) {
4452 spin_unlock_bh(&sess->conn_lock);
4453 iscsit_start_time2retain_handler(sess);
4455 spin_unlock_bh(&sess->conn_lock);
4457 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4458 complete(&sess->session_wait_comp);
4462 spin_unlock_bh(&sess->conn_lock);
4467 int iscsit_close_session(struct iscsi_session *sess)
4469 struct iscsi_portal_group *tpg = sess->tpg;
4470 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4472 if (atomic_read(&sess->nconn)) {
4473 pr_err("%d connection(s) still exist for iSCSI session"
4474 " to %s\n", atomic_read(&sess->nconn),
4475 sess->sess_ops->InitiatorName);
4479 spin_lock_bh(&se_tpg->session_lock);
4480 atomic_set(&sess->session_logout, 1);
4481 atomic_set(&sess->session_reinstatement, 1);
4482 iscsit_stop_time2retain_timer(sess);
4483 spin_unlock_bh(&se_tpg->session_lock);
4486 * transport_deregister_session_configfs() will clear the
4487 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4488 * can be setting it again with __transport_register_session() in
4489 * iscsi_post_login_handler() again after the iscsit_stop_session()
4490 * completes in iscsi_np context.
4492 transport_deregister_session_configfs(sess->se_sess);
4495 * If any other processes are accessing this session pointer we must
4496 * wait until they have completed. If we are in an interrupt (the
4497 * time2retain handler) and contain and active session usage count we
4498 * restart the timer and exit.
4500 if (!in_interrupt()) {
4501 if (iscsit_check_session_usage_count(sess) == 1)
4502 iscsit_stop_session(sess, 1, 1);
4504 if (iscsit_check_session_usage_count(sess) == 2) {
4505 atomic_set(&sess->session_logout, 0);
4506 iscsit_start_time2retain_handler(sess);
4511 transport_deregister_session(sess->se_sess);
4513 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4514 iscsit_free_connection_recovery_entires(sess);
4516 iscsit_free_all_ooo_cmdsns(sess);
4518 spin_lock_bh(&se_tpg->session_lock);
4519 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4520 sess->session_state = TARG_SESS_STATE_FREE;
4521 pr_debug("Released iSCSI session from node: %s\n",
4522 sess->sess_ops->InitiatorName);
4525 tpg->tpg_tiqn->tiqn_nsessions--;
4527 pr_debug("Decremented number of active iSCSI Sessions on"
4528 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4530 spin_lock(&sess_idr_lock);
4531 idr_remove(&sess_idr, sess->session_index);
4532 spin_unlock(&sess_idr_lock);
4534 kfree(sess->sess_ops);
4535 sess->sess_ops = NULL;
4536 spin_unlock_bh(&se_tpg->session_lock);
4542 static void iscsit_logout_post_handler_closesession(
4543 struct iscsi_conn *conn)
4545 struct iscsi_session *sess = conn->sess;
4546 int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4548 atomic_set(&conn->conn_logout_remove, 0);
4549 complete(&conn->conn_logout_comp);
4551 iscsit_dec_conn_usage_count(conn);
4552 iscsit_stop_session(sess, sleep, sleep);
4553 iscsit_dec_session_usage_count(sess);
4554 target_put_session(sess->se_sess);
4557 static void iscsit_logout_post_handler_samecid(
4558 struct iscsi_conn *conn)
4560 int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4562 atomic_set(&conn->conn_logout_remove, 0);
4563 complete(&conn->conn_logout_comp);
4565 iscsit_cause_connection_reinstatement(conn, sleep);
4566 iscsit_dec_conn_usage_count(conn);
4569 static void iscsit_logout_post_handler_diffcid(
4570 struct iscsi_conn *conn,
4573 struct iscsi_conn *l_conn;
4574 struct iscsi_session *sess = conn->sess;
4575 bool conn_found = false;
4580 spin_lock_bh(&sess->conn_lock);
4581 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4582 if (l_conn->cid == cid) {
4583 iscsit_inc_conn_usage_count(l_conn);
4588 spin_unlock_bh(&sess->conn_lock);
4594 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4596 spin_lock_bh(&l_conn->state_lock);
4597 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4598 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4599 spin_unlock_bh(&l_conn->state_lock);
4601 iscsit_cause_connection_reinstatement(l_conn, 1);
4602 iscsit_dec_conn_usage_count(l_conn);
4606 * Return of 0 causes the TX thread to restart.
4608 int iscsit_logout_post_handler(
4609 struct iscsi_cmd *cmd,
4610 struct iscsi_conn *conn)
4614 switch (cmd->logout_reason) {
4615 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4616 switch (cmd->logout_response) {
4617 case ISCSI_LOGOUT_SUCCESS:
4618 case ISCSI_LOGOUT_CLEANUP_FAILED:
4620 iscsit_logout_post_handler_closesession(conn);
4625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4626 if (conn->cid == cmd->logout_cid) {
4627 switch (cmd->logout_response) {
4628 case ISCSI_LOGOUT_SUCCESS:
4629 case ISCSI_LOGOUT_CLEANUP_FAILED:
4631 iscsit_logout_post_handler_samecid(conn);
4636 switch (cmd->logout_response) {
4637 case ISCSI_LOGOUT_SUCCESS:
4638 iscsit_logout_post_handler_diffcid(conn,
4641 case ISCSI_LOGOUT_CID_NOT_FOUND:
4642 case ISCSI_LOGOUT_CLEANUP_FAILED:
4649 case ISCSI_LOGOUT_REASON_RECOVERY:
4650 switch (cmd->logout_response) {
4651 case ISCSI_LOGOUT_SUCCESS:
4652 case ISCSI_LOGOUT_CID_NOT_FOUND:
4653 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4654 case ISCSI_LOGOUT_CLEANUP_FAILED:
4666 EXPORT_SYMBOL(iscsit_logout_post_handler);
4668 void iscsit_fail_session(struct iscsi_session *sess)
4670 struct iscsi_conn *conn;
4672 spin_lock_bh(&sess->conn_lock);
4673 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4674 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4675 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4677 spin_unlock_bh(&sess->conn_lock);
4679 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4680 sess->session_state = TARG_SESS_STATE_FAILED;
4683 int iscsit_free_session(struct iscsi_session *sess)
4685 u16 conn_count = atomic_read(&sess->nconn);
4686 struct iscsi_conn *conn, *conn_tmp = NULL;
4689 spin_lock_bh(&sess->conn_lock);
4690 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4692 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4694 if (conn_count == 0)
4697 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4700 iscsit_inc_conn_usage_count(conn_tmp);
4703 iscsit_inc_conn_usage_count(conn);
4705 spin_unlock_bh(&sess->conn_lock);
4706 iscsit_cause_connection_reinstatement(conn, 1);
4707 spin_lock_bh(&sess->conn_lock);
4709 iscsit_dec_conn_usage_count(conn);
4711 iscsit_dec_conn_usage_count(conn_tmp);
4716 if (atomic_read(&sess->nconn)) {
4717 spin_unlock_bh(&sess->conn_lock);
4718 wait_for_completion(&sess->session_wait_comp);
4720 spin_unlock_bh(&sess->conn_lock);
4722 target_put_session(sess->se_sess);
4726 void iscsit_stop_session(
4727 struct iscsi_session *sess,
4729 int connection_sleep)
4731 u16 conn_count = atomic_read(&sess->nconn);
4732 struct iscsi_conn *conn, *conn_tmp = NULL;
4735 spin_lock_bh(&sess->conn_lock);
4737 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4739 if (connection_sleep) {
4740 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4742 if (conn_count == 0)
4745 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4748 iscsit_inc_conn_usage_count(conn_tmp);
4751 iscsit_inc_conn_usage_count(conn);
4753 spin_unlock_bh(&sess->conn_lock);
4754 iscsit_cause_connection_reinstatement(conn, 1);
4755 spin_lock_bh(&sess->conn_lock);
4757 iscsit_dec_conn_usage_count(conn);
4759 iscsit_dec_conn_usage_count(conn_tmp);
4763 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4764 iscsit_cause_connection_reinstatement(conn, 0);
4767 if (session_sleep && atomic_read(&sess->nconn)) {
4768 spin_unlock_bh(&sess->conn_lock);
4769 wait_for_completion(&sess->session_wait_comp);
4771 spin_unlock_bh(&sess->conn_lock);
4774 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4776 struct iscsi_session *sess;
4777 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4778 struct se_session *se_sess, *se_sess_tmp;
4779 int session_count = 0;
4781 spin_lock_bh(&se_tpg->session_lock);
4782 if (tpg->nsessions && !force) {
4783 spin_unlock_bh(&se_tpg->session_lock);
4787 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4789 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4791 spin_lock(&sess->conn_lock);
4792 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4793 atomic_read(&sess->session_logout) ||
4794 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4795 spin_unlock(&sess->conn_lock);
4798 atomic_set(&sess->session_reinstatement, 1);
4799 spin_unlock(&sess->conn_lock);
4800 spin_unlock_bh(&se_tpg->session_lock);
4802 iscsit_free_session(sess);
4803 spin_lock_bh(&se_tpg->session_lock);
4807 spin_unlock_bh(&se_tpg->session_lock);
4809 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4810 " Group: %hu\n", session_count, tpg->tpgt);
4814 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4815 MODULE_VERSION("4.1.x");
4816 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4817 MODULE_LICENSE("GPL");
4819 module_init(iscsi_target_init_module);
4820 module_exit(iscsi_target_cleanup_module);