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/vmalloc.h>
25 #include <linux/idr.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.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);
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(&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);
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(&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 /* only used for printks or comparing with ->ref_task_tag */
1012 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1013 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1014 if (cmd->sense_reason) {
1015 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1016 return iscsit_add_reject_cmd(cmd,
1017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1023 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1024 return iscsit_add_reject_cmd(cmd,
1025 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1029 spin_lock_bh(&conn->cmd_lock);
1030 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1031 spin_unlock_bh(&conn->cmd_lock);
1033 * Check if we need to delay processing because of ALUA
1034 * Active/NonOptimized primary access state..
1036 core_alua_check_nonop_delay(&cmd->se_cmd);
1040 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1042 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1044 iscsit_set_dataout_sequence_values(cmd);
1046 spin_lock_bh(&cmd->dataout_timeout_lock);
1047 iscsit_start_dataout_timer(cmd, cmd->conn);
1048 spin_unlock_bh(&cmd->dataout_timeout_lock);
1050 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1052 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1053 struct iscsi_scsi_req *hdr)
1057 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1058 * the Immediate Bit is not set, and no Immediate
1061 * A PDU/CmdSN carrying Immediate Data can only
1062 * be processed after the DataCRC has passed.
1063 * If the DataCRC fails, the CmdSN MUST NOT
1064 * be acknowledged. (See below)
1066 if (!cmd->immediate_data) {
1067 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1068 (unsigned char *)hdr, hdr->cmdsn);
1069 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1071 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1072 target_put_sess_cmd(&cmd->se_cmd);
1077 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1080 * If no Immediate Data is attached, it's OK to return now.
1082 if (!cmd->immediate_data) {
1083 if (!cmd->sense_reason && cmd->unsolicited_data)
1084 iscsit_set_unsoliticed_dataout(cmd);
1085 if (!cmd->sense_reason)
1088 target_put_sess_cmd(&cmd->se_cmd);
1093 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1094 * execution. These exceptions are processed in CmdSN order using
1095 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1097 if (cmd->sense_reason) {
1098 if (cmd->reject_reason)
1104 * Call directly into transport_generic_new_cmd() to perform
1105 * the backend memory allocation.
1107 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1108 if (cmd->sense_reason)
1113 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1116 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1119 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1121 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1124 goto after_immediate_data;
1126 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1127 cmd->first_burst_len);
1128 after_immediate_data:
1129 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1131 * A PDU/CmdSN carrying Immediate Data passed
1132 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1133 * Immediate Bit is not set.
1135 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1136 (unsigned char *)hdr, hdr->cmdsn);
1137 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1140 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1143 rc = iscsit_dump_data_payload(cmd->conn,
1144 cmd->first_burst_len, 1);
1145 target_put_sess_cmd(&cmd->se_cmd);
1147 } else if (cmd->unsolicited_data)
1148 iscsit_set_unsoliticed_dataout(cmd);
1150 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1152 * Immediate Data failed DataCRC and ERL>=1,
1153 * silently drop this PDU and let the initiator
1154 * plug the CmdSN gap.
1156 * FIXME: Send Unsolicited NOPIN with reserved
1157 * TTT here to help the initiator figure out
1158 * the missing CmdSN, although they should be
1159 * intelligent enough to determine the missing
1160 * CmdSN and issue a retry to plug the sequence.
1162 cmd->i_state = ISTATE_REMOVE;
1163 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1164 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1174 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1176 bool dump_payload = false;
1178 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1182 * Allocation iovecs needed for struct socket operations for
1183 * traditional iSCSI block I/O.
1185 if (iscsit_allocate_iovecs(cmd) < 0) {
1186 return iscsit_reject_cmd(cmd,
1187 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1189 immed_data = cmd->immediate_data;
1191 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1195 dump_payload = true;
1200 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1203 static u32 iscsit_do_crypto_hash_sg(
1204 struct hash_desc *hash,
1205 struct iscsi_cmd *cmd,
1213 struct scatterlist *sg;
1214 unsigned int page_off;
1216 crypto_hash_init(hash);
1218 sg = cmd->first_data_sg;
1219 page_off = cmd->first_data_sg_off;
1222 while (data_length) {
1223 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1225 crypto_hash_update(hash, &sg[i], cur_len);
1227 data_length -= cur_len;
1233 struct scatterlist pad_sg;
1235 sg_init_one(&pad_sg, pad_bytes, padding);
1236 crypto_hash_update(hash, &pad_sg, padding);
1238 crypto_hash_final(hash, (u8 *) &data_crc);
1243 static void iscsit_do_crypto_hash_buf(
1244 struct hash_desc *hash,
1251 struct scatterlist sg;
1253 crypto_hash_init(hash);
1255 sg_init_one(&sg, buf, payload_length);
1256 crypto_hash_update(hash, &sg, payload_length);
1259 sg_init_one(&sg, pad_bytes, padding);
1260 crypto_hash_update(hash, &sg, padding);
1262 crypto_hash_final(hash, data_crc);
1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1267 struct iscsi_cmd **out_cmd)
1269 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1270 struct iscsi_cmd *cmd = NULL;
1271 struct se_cmd *se_cmd;
1272 u32 payload_length = ntoh24(hdr->dlength);
1275 if (!payload_length) {
1276 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1281 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1283 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1284 pr_err("DataSegmentLength: %u is greater than"
1285 " MaxXmitDataSegmentLength: %u\n", payload_length,
1286 conn->conn_ops->MaxXmitDataSegmentLength);
1287 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1291 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1296 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1297 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1298 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1299 payload_length, conn->cid);
1301 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1302 pr_err("Command ITT: 0x%08x received DataOUT after"
1303 " last DataOUT received, dumping payload\n",
1304 cmd->init_task_tag);
1305 return iscsit_dump_data_payload(conn, payload_length, 1);
1308 if (cmd->data_direction != DMA_TO_DEVICE) {
1309 pr_err("Command ITT: 0x%08x received DataOUT for a"
1310 " NON-WRITE command.\n", cmd->init_task_tag);
1311 return iscsit_dump_data_payload(conn, payload_length, 1);
1313 se_cmd = &cmd->se_cmd;
1314 iscsit_mod_dataout_timer(cmd);
1316 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1317 pr_err("DataOut Offset: %u, Length %u greater than"
1318 " iSCSI Command EDTL %u, protocol error.\n",
1319 hdr->offset, payload_length, cmd->se_cmd.data_length);
1320 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1323 if (cmd->unsolicited_data) {
1324 int dump_unsolicited_data = 0;
1326 if (conn->sess->sess_ops->InitialR2T) {
1327 pr_err("Received unexpected unsolicited data"
1328 " while InitialR2T=Yes, protocol error.\n");
1329 transport_send_check_condition_and_sense(&cmd->se_cmd,
1330 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1334 * Special case for dealing with Unsolicited DataOUT
1335 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1339 /* Something's amiss if we're not in WRITE_PENDING state... */
1340 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1341 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1342 dump_unsolicited_data = 1;
1344 if (dump_unsolicited_data) {
1346 * Check if a delayed TASK_ABORTED status needs to
1347 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1348 * received with the unsolicitied data out.
1350 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1351 iscsit_stop_dataout_timer(cmd);
1353 transport_check_aborted_status(se_cmd,
1354 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1355 return iscsit_dump_data_payload(conn, payload_length, 1);
1359 * For the normal solicited data path:
1361 * Check for a delayed TASK_ABORTED status and dump any
1362 * incoming data out payload if one exists. Also, when the
1363 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1364 * data out sequence, we decrement outstanding_r2ts. Once
1365 * outstanding_r2ts reaches zero, go ahead and send the delayed
1366 * TASK_ABORTED status.
1368 if (se_cmd->transport_state & CMD_T_ABORTED) {
1369 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1370 if (--cmd->outstanding_r2ts < 1) {
1371 iscsit_stop_dataout_timer(cmd);
1372 transport_check_aborted_status(
1376 return iscsit_dump_data_payload(conn, payload_length, 1);
1380 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1381 * within-command recovery checks before receiving the payload.
1383 rc = iscsit_check_pre_dataout(cmd, buf);
1384 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1386 else if (rc == DATAOUT_CANNOT_RECOVER)
1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1396 struct iscsi_data *hdr)
1399 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1400 u32 payload_length = ntoh24(hdr->dlength);
1401 int iov_ret, data_crc_failed = 0;
1403 rx_size += payload_length;
1404 iov = &cmd->iov_data[0];
1406 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1411 iov_count += iov_ret;
1413 padding = ((-payload_length) & 3);
1415 iov[iov_count].iov_base = cmd->pad_bytes;
1416 iov[iov_count++].iov_len = padding;
1418 pr_debug("Receiving %u padding bytes.\n", padding);
1421 if (conn->conn_ops->DataDigest) {
1422 iov[iov_count].iov_base = &checksum;
1423 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1424 rx_size += ISCSI_CRC_LEN;
1427 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1429 iscsit_unmap_iovec(cmd);
1431 if (rx_got != rx_size)
1434 if (conn->conn_ops->DataDigest) {
1437 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1438 be32_to_cpu(hdr->offset),
1439 payload_length, padding,
1442 if (checksum != data_crc) {
1443 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1444 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1445 " does not match computed 0x%08x\n",
1446 hdr->itt, hdr->offset, payload_length,
1447 hdr->datasn, checksum, data_crc);
1448 data_crc_failed = 1;
1450 pr_debug("Got CRC32C DataDigest 0x%08x for"
1451 " %u bytes of Data Out\n", checksum,
1456 return data_crc_failed;
1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1461 bool data_crc_failed)
1463 struct iscsi_conn *conn = cmd->conn;
1466 * Increment post receive data and CRC values or perform
1467 * within-command recovery.
1469 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1470 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1472 else if (rc == DATAOUT_SEND_R2T) {
1473 iscsit_set_dataout_sequence_values(cmd);
1474 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1475 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1477 * Handle extra special case for out of order
1478 * Unsolicited Data Out.
1480 spin_lock_bh(&cmd->istate_lock);
1481 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1482 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1483 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1484 spin_unlock_bh(&cmd->istate_lock);
1486 iscsit_stop_dataout_timer(cmd);
1489 target_execute_cmd(&cmd->se_cmd);
1491 } else /* DATAOUT_CANNOT_RECOVER */
1496 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1500 struct iscsi_cmd *cmd = NULL;
1501 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1503 bool data_crc_failed = false;
1505 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1511 rc = iscsit_get_dataout(conn, cmd, hdr);
1515 data_crc_failed = true;
1517 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1521 struct iscsi_nopout *hdr)
1523 u32 payload_length = ntoh24(hdr->dlength);
1525 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1526 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1528 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1529 (unsigned char *)hdr);
1531 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1532 (unsigned char *)hdr);
1535 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1536 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1537 " not set, protocol error.\n");
1539 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540 (unsigned char *)hdr);
1542 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543 (unsigned char *)hdr);
1546 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1548 " greater than MaxXmitDataSegmentLength: %u, protocol"
1549 " error.\n", payload_length,
1550 conn->conn_ops->MaxXmitDataSegmentLength);
1552 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1553 (unsigned char *)hdr);
1555 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1556 (unsigned char *)hdr);
1559 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1560 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1561 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1562 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1565 * This is not a response to a Unsolicited NopIN, which means
1566 * it can either be a NOPOUT ping request (with a valid ITT),
1567 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568 * Either way, make sure we allocate an struct iscsi_cmd, as both
1569 * can contain ping data.
1571 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1572 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1573 cmd->i_state = ISTATE_SEND_NOPIN;
1574 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1576 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577 cmd->targ_xfer_tag = 0xFFFFFFFF;
1578 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1579 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1580 cmd->data_direction = DMA_NONE;
1585 EXPORT_SYMBOL(iscsit_setup_nop_out);
1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588 struct iscsi_nopout *hdr)
1590 struct iscsi_cmd *cmd_p = NULL;
1593 * Initiator is expecting a NopIN ping reply..
1595 if (hdr->itt != RESERVED_ITT) {
1597 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1598 (unsigned char *)hdr);
1600 spin_lock_bh(&conn->cmd_lock);
1601 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1602 spin_unlock_bh(&conn->cmd_lock);
1604 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1606 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1607 iscsit_add_cmd_to_response_queue(cmd, conn,
1612 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1613 (unsigned char *)hdr, hdr->cmdsn);
1614 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1616 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1622 * This was a response to a unsolicited NOPIN ping.
1624 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1625 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1629 iscsit_stop_nopin_response_timer(conn);
1631 cmd_p->i_state = ISTATE_REMOVE;
1632 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1634 iscsit_start_nopin_timer(conn);
1638 * Otherwise, initiator is not expecting a NOPIN is response.
1639 * Just ignore for now.
1643 EXPORT_SYMBOL(iscsit_process_nop_out);
1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1648 unsigned char *ping_data = NULL;
1649 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1650 struct kvec *iov = NULL;
1651 u32 payload_length = ntoh24(hdr->dlength);
1654 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1658 * Handle NOP-OUT payload for traditional iSCSI sockets
1660 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1661 u32 checksum, data_crc, padding = 0;
1662 int niov = 0, rx_got, rx_size = payload_length;
1664 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1666 pr_err("Unable to allocate memory for"
1667 " NOPOUT ping data.\n");
1672 iov = &cmd->iov_misc[0];
1673 iov[niov].iov_base = ping_data;
1674 iov[niov++].iov_len = payload_length;
1676 padding = ((-payload_length) & 3);
1678 pr_debug("Receiving %u additional bytes"
1679 " for padding.\n", padding);
1680 iov[niov].iov_base = &cmd->pad_bytes;
1681 iov[niov++].iov_len = padding;
1684 if (conn->conn_ops->DataDigest) {
1685 iov[niov].iov_base = &checksum;
1686 iov[niov++].iov_len = ISCSI_CRC_LEN;
1687 rx_size += ISCSI_CRC_LEN;
1690 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1691 if (rx_got != rx_size) {
1696 if (conn->conn_ops->DataDigest) {
1697 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1698 ping_data, payload_length,
1699 padding, cmd->pad_bytes,
1702 if (checksum != data_crc) {
1703 pr_err("Ping data CRC32C DataDigest"
1704 " 0x%08x does not match computed 0x%08x\n",
1705 checksum, data_crc);
1706 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1707 pr_err("Unable to recover from"
1708 " NOPOUT Ping DataCRC failure while in"
1714 * Silently drop this PDU and let the
1715 * initiator plug the CmdSN gap.
1717 pr_debug("Dropping NOPOUT"
1718 " Command CmdSN: 0x%08x due to"
1719 " DataCRC error.\n", hdr->cmdsn);
1724 pr_debug("Got CRC32C DataDigest"
1725 " 0x%08x for %u bytes of ping data.\n",
1726 checksum, payload_length);
1730 ping_data[payload_length] = '\0';
1732 * Attach ping data to struct iscsi_cmd->buf_ptr.
1734 cmd->buf_ptr = ping_data;
1735 cmd->buf_ptr_size = payload_length;
1737 pr_debug("Got %u bytes of NOPOUT ping"
1738 " data.\n", payload_length);
1739 pr_debug("Ping Data: \"%s\"\n", ping_data);
1742 return iscsit_process_nop_out(conn, cmd, hdr);
1745 iscsit_free_cmd(cmd, false);
1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1755 struct se_tmr_req *se_tmr;
1756 struct iscsi_tmr_req *tmr_req;
1757 struct iscsi_tm *hdr;
1758 int out_of_order_cmdsn = 0, ret;
1759 bool sess_ref = false;
1762 hdr = (struct iscsi_tm *) buf;
1763 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1764 function = hdr->flags;
1766 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1767 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1768 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1769 hdr->rtt, hdr->refcmdsn, conn->cid);
1771 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773 hdr->rtt != RESERVED_ITT)) {
1774 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1775 hdr->rtt = RESERVED_ITT;
1778 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1779 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1780 pr_err("Task Management Request TASK_REASSIGN not"
1781 " issued as immediate command, bad iSCSI Initiator"
1782 "implementation\n");
1783 return iscsit_add_reject_cmd(cmd,
1784 ISCSI_REASON_PROTOCOL_ERROR, buf);
1786 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1787 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1788 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1790 cmd->data_direction = DMA_NONE;
1792 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1793 if (!cmd->tmr_req) {
1794 pr_err("Unable to allocate memory for"
1795 " Task Management command!\n");
1796 return iscsit_add_reject_cmd(cmd,
1797 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1802 * TASK_REASSIGN for ERL=2 / connection stays inside of
1803 * LIO-Target $FABRIC_MOD
1805 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1810 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1811 conn->sess->se_sess, 0, DMA_NONE,
1812 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1814 target_get_sess_cmd(&cmd->se_cmd, true);
1818 case ISCSI_TM_FUNC_ABORT_TASK:
1819 tcm_function = TMR_ABORT_TASK;
1821 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1822 tcm_function = TMR_ABORT_TASK_SET;
1824 case ISCSI_TM_FUNC_CLEAR_ACA:
1825 tcm_function = TMR_CLEAR_ACA;
1827 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1828 tcm_function = TMR_CLEAR_TASK_SET;
1830 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1831 tcm_function = TMR_LUN_RESET;
1833 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1834 tcm_function = TMR_TARGET_WARM_RESET;
1836 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1837 tcm_function = TMR_TARGET_COLD_RESET;
1840 pr_err("Unknown iSCSI TMR Function:"
1841 " 0x%02x\n", function);
1842 return iscsit_add_reject_cmd(cmd,
1843 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1846 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1847 tcm_function, GFP_KERNEL);
1849 return iscsit_add_reject_cmd(cmd,
1850 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1852 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1855 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1856 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1857 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1858 cmd->init_task_tag = hdr->itt;
1859 cmd->targ_xfer_tag = 0xFFFFFFFF;
1860 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1861 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1862 se_tmr = cmd->se_cmd.se_tmr_req;
1863 tmr_req = cmd->tmr_req;
1865 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1867 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1868 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1869 scsilun_to_int(&hdr->lun));
1871 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1877 case ISCSI_TM_FUNC_ABORT_TASK:
1878 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1879 if (se_tmr->response)
1882 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1883 case ISCSI_TM_FUNC_CLEAR_ACA:
1884 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1885 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1887 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1888 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1889 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1893 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1894 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1895 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1899 case ISCSI_TM_FUNC_TASK_REASSIGN:
1900 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1902 * Perform sanity checks on the ExpDataSN only if the
1903 * TASK_REASSIGN was successful.
1905 if (se_tmr->response)
1908 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1909 return iscsit_add_reject_cmd(cmd,
1910 ISCSI_REASON_BOOKMARK_INVALID, buf);
1913 pr_err("Unknown TMR function: 0x%02x, protocol"
1914 " error.\n", function);
1915 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1919 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1920 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1921 se_tmr->call_transport = 1;
1923 spin_lock_bh(&conn->cmd_lock);
1924 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1925 spin_unlock_bh(&conn->cmd_lock);
1927 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1928 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1929 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1930 out_of_order_cmdsn = 1;
1931 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1933 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1936 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1938 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1941 * Found the referenced task, send to transport for processing.
1943 if (se_tmr->call_transport)
1944 return transport_generic_handle_tmr(&cmd->se_cmd);
1947 * Could not find the referenced LUN, task, or Task Management
1948 * command not authorized or supported. Change state and
1949 * let the tx_thread send the response.
1951 * For connection recovery, this is also the default action for
1952 * TMR TASK_REASSIGN.
1955 pr_debug("Handle TMR, using sess_ref=true check\n");
1956 target_put_sess_cmd(&cmd->se_cmd);
1959 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1966 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967 struct iscsi_text *hdr)
1969 u32 payload_length = ntoh24(hdr->dlength);
1971 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1972 pr_err("Unable to accept text parameter length: %u"
1973 "greater than MaxXmitDataSegmentLength %u.\n",
1974 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1975 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1976 (unsigned char *)hdr);
1979 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1980 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1981 pr_err("Multi sequence text commands currently not supported\n");
1982 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1983 (unsigned char *)hdr);
1986 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1987 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1988 hdr->exp_statsn, payload_length);
1990 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1991 cmd->i_state = ISTATE_SEND_TEXTRSP;
1992 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1993 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1994 cmd->targ_xfer_tag = 0xFFFFFFFF;
1995 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1996 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1997 cmd->data_direction = DMA_NONE;
1998 cmd->text_in_ptr = NULL;
2002 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2005 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2006 struct iscsi_text *hdr)
2008 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2012 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2013 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2014 pr_err("Unable to locate text_in buffer for sendtargets"
2018 goto empty_sendtargets;
2020 if (strncmp("SendTargets", text_in, 11) != 0) {
2021 pr_err("Received Text Data that is not"
2022 " SendTargets, cannot continue.\n");
2025 text_ptr = strchr(text_in, '=');
2027 pr_err("No \"=\" separator found in Text Data,"
2028 " cannot continue.\n");
2031 if (!strncmp("=All", text_ptr, 4)) {
2032 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2033 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2034 !strncmp("=eui.", text_ptr, 5)) {
2035 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2037 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2041 spin_lock_bh(&conn->cmd_lock);
2042 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2043 spin_unlock_bh(&conn->cmd_lock);
2046 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2048 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2049 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2050 (unsigned char *)hdr, hdr->cmdsn);
2051 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2057 return iscsit_execute_cmd(cmd, 0);
2060 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2061 (unsigned char *)hdr);
2063 EXPORT_SYMBOL(iscsit_process_text_cmd);
2066 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2069 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2070 char *text_in = NULL;
2071 u32 payload_length = ntoh24(hdr->dlength);
2074 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2078 rx_size = payload_length;
2079 if (payload_length) {
2080 u32 checksum = 0, data_crc = 0;
2081 u32 padding = 0, pad_bytes = 0;
2082 int niov = 0, rx_got;
2085 text_in = kzalloc(payload_length, GFP_KERNEL);
2087 pr_err("Unable to allocate memory for"
2088 " incoming text parameters\n");
2091 cmd->text_in_ptr = text_in;
2093 memset(iov, 0, 3 * sizeof(struct kvec));
2094 iov[niov].iov_base = text_in;
2095 iov[niov++].iov_len = payload_length;
2097 padding = ((-payload_length) & 3);
2099 iov[niov].iov_base = &pad_bytes;
2100 iov[niov++].iov_len = padding;
2102 pr_debug("Receiving %u additional bytes"
2103 " for padding.\n", padding);
2105 if (conn->conn_ops->DataDigest) {
2106 iov[niov].iov_base = &checksum;
2107 iov[niov++].iov_len = ISCSI_CRC_LEN;
2108 rx_size += ISCSI_CRC_LEN;
2111 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2112 if (rx_got != rx_size)
2115 if (conn->conn_ops->DataDigest) {
2116 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2117 text_in, payload_length,
2118 padding, (u8 *)&pad_bytes,
2121 if (checksum != data_crc) {
2122 pr_err("Text data CRC32C DataDigest"
2123 " 0x%08x does not match computed"
2124 " 0x%08x\n", checksum, data_crc);
2125 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2126 pr_err("Unable to recover from"
2127 " Text Data digest failure while in"
2132 * Silently drop this PDU and let the
2133 * initiator plug the CmdSN gap.
2135 pr_debug("Dropping Text"
2136 " Command CmdSN: 0x%08x due to"
2137 " DataCRC error.\n", hdr->cmdsn);
2142 pr_debug("Got CRC32C DataDigest"
2143 " 0x%08x for %u bytes of text data.\n",
2144 checksum, payload_length);
2147 text_in[payload_length - 1] = '\0';
2148 pr_debug("Successfully read %d bytes of text"
2149 " data.\n", payload_length);
2152 return iscsit_process_text_cmd(conn, cmd, hdr);
2155 kfree(cmd->text_in_ptr);
2156 cmd->text_in_ptr = NULL;
2157 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2160 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2162 struct iscsi_conn *conn_p;
2163 struct iscsi_session *sess = conn->sess;
2165 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2166 " for SID: %u.\n", conn->cid, conn->sess->sid);
2168 atomic_set(&sess->session_logout, 1);
2169 atomic_set(&conn->conn_logout_remove, 1);
2170 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2172 iscsit_inc_conn_usage_count(conn);
2173 iscsit_inc_session_usage_count(sess);
2175 spin_lock_bh(&sess->conn_lock);
2176 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2177 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2180 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2183 spin_unlock_bh(&sess->conn_lock);
2185 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2190 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2192 struct iscsi_conn *l_conn;
2193 struct iscsi_session *sess = conn->sess;
2195 pr_debug("Received logout request CLOSECONNECTION for CID:"
2196 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2199 * A Logout Request with a CLOSECONNECTION reason code for a CID
2200 * can arrive on a connection with a differing CID.
2202 if (conn->cid == cmd->logout_cid) {
2203 spin_lock_bh(&conn->state_lock);
2204 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2205 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2207 atomic_set(&conn->conn_logout_remove, 1);
2208 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2209 iscsit_inc_conn_usage_count(conn);
2211 spin_unlock_bh(&conn->state_lock);
2214 * Handle all different cid CLOSECONNECTION requests in
2215 * iscsit_logout_post_handler_diffcid() as to give enough
2216 * time for any non immediate command's CmdSN to be
2217 * acknowledged on the connection in question.
2219 * Here we simply make sure the CID is still around.
2221 l_conn = iscsit_get_conn_from_cid(sess,
2224 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2225 iscsit_add_cmd_to_response_queue(cmd, conn,
2230 iscsit_dec_conn_usage_count(l_conn);
2233 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2240 struct iscsi_session *sess = conn->sess;
2242 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2243 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2245 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2246 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247 " while ERL!=2.\n");
2248 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2249 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2253 if (conn->cid == cmd->logout_cid) {
2254 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2255 " with CID: %hu on CID: %hu, implementation error.\n",
2256 cmd->logout_cid, conn->cid);
2257 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2258 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2262 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2268 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2271 int cmdsn_ret, logout_remove = 0;
2273 struct iscsi_logout *hdr;
2274 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2276 hdr = (struct iscsi_logout *) buf;
2277 reason_code = (hdr->flags & 0x7f);
2280 spin_lock(&tiqn->logout_stats.lock);
2281 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2282 tiqn->logout_stats.normal_logouts++;
2284 tiqn->logout_stats.abnormal_logouts++;
2285 spin_unlock(&tiqn->logout_stats.lock);
2288 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2289 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2290 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2291 hdr->cid, conn->cid);
2293 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2294 pr_err("Received logout request on connection that"
2295 " is not in logged in state, ignoring request.\n");
2296 iscsit_free_cmd(cmd, false);
2300 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2301 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2302 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2303 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2304 cmd->targ_xfer_tag = 0xFFFFFFFF;
2305 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2306 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2307 cmd->logout_cid = be16_to_cpu(hdr->cid);
2308 cmd->logout_reason = reason_code;
2309 cmd->data_direction = DMA_NONE;
2312 * We need to sleep in these cases (by returning 1) until the Logout
2313 * Response gets sent in the tx thread.
2315 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2316 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2317 be16_to_cpu(hdr->cid) == conn->cid))
2320 spin_lock_bh(&conn->cmd_lock);
2321 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2322 spin_unlock_bh(&conn->cmd_lock);
2324 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2325 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2328 * Immediate commands are executed, well, immediately.
2329 * Non-Immediate Logout Commands are executed in CmdSN order.
2331 if (cmd->immediate_cmd) {
2332 int ret = iscsit_execute_cmd(cmd, 0);
2337 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2338 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2340 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2344 return logout_remove;
2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2348 static int iscsit_handle_snack(
2349 struct iscsi_conn *conn,
2352 struct iscsi_snack *hdr;
2354 hdr = (struct iscsi_snack *) buf;
2355 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2357 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2358 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2359 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2360 hdr->begrun, hdr->runlength, conn->cid);
2362 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2363 pr_err("Initiator sent SNACK request while in"
2364 " ErrorRecoveryLevel=0.\n");
2365 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2369 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2370 * call from inside iscsi_send_recovery_datain_or_r2t().
2372 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2374 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2376 be32_to_cpu(hdr->ttt),
2377 be32_to_cpu(hdr->begrun),
2378 be32_to_cpu(hdr->runlength));
2379 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2380 return iscsit_handle_status_snack(conn, hdr->itt,
2381 be32_to_cpu(hdr->ttt),
2382 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2383 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2384 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2385 be32_to_cpu(hdr->begrun),
2386 be32_to_cpu(hdr->runlength));
2387 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2388 /* FIXME: Support R-Data SNACK */
2389 pr_err("R-Data SNACK Not Supported.\n");
2390 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2393 pr_err("Unknown SNACK type 0x%02x, protocol"
2394 " error.\n", hdr->flags & 0x0f);
2395 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2404 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2405 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2406 wait_for_completion_interruptible_timeout(
2407 &conn->rx_half_close_comp,
2408 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2412 static int iscsit_handle_immediate_data(
2413 struct iscsi_cmd *cmd,
2414 struct iscsi_scsi_req *hdr,
2417 int iov_ret, rx_got = 0, rx_size = 0;
2418 u32 checksum, iov_count = 0, padding = 0;
2419 struct iscsi_conn *conn = cmd->conn;
2422 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2424 return IMMEDIATE_DATA_CANNOT_RECOVER;
2427 iov_count = iov_ret;
2428 iov = &cmd->iov_data[0];
2430 padding = ((-length) & 3);
2432 iov[iov_count].iov_base = cmd->pad_bytes;
2433 iov[iov_count++].iov_len = padding;
2437 if (conn->conn_ops->DataDigest) {
2438 iov[iov_count].iov_base = &checksum;
2439 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2440 rx_size += ISCSI_CRC_LEN;
2443 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2445 iscsit_unmap_iovec(cmd);
2447 if (rx_got != rx_size) {
2448 iscsit_rx_thread_wait_for_tcp(conn);
2449 return IMMEDIATE_DATA_CANNOT_RECOVER;
2452 if (conn->conn_ops->DataDigest) {
2455 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2456 cmd->write_data_done, length, padding,
2459 if (checksum != data_crc) {
2460 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2461 " does not match computed 0x%08x\n", checksum,
2464 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2465 pr_err("Unable to recover from"
2466 " Immediate Data digest failure while"
2468 iscsit_reject_cmd(cmd,
2469 ISCSI_REASON_DATA_DIGEST_ERROR,
2470 (unsigned char *)hdr);
2471 return IMMEDIATE_DATA_CANNOT_RECOVER;
2473 iscsit_reject_cmd(cmd,
2474 ISCSI_REASON_DATA_DIGEST_ERROR,
2475 (unsigned char *)hdr);
2476 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2479 pr_debug("Got CRC32C DataDigest 0x%08x for"
2480 " %u bytes of Immediate Data\n", checksum,
2485 cmd->write_data_done += length;
2487 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2488 spin_lock_bh(&cmd->istate_lock);
2489 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2490 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2491 spin_unlock_bh(&cmd->istate_lock);
2494 return IMMEDIATE_DATA_NORMAL_OPERATION;
2498 * Called with sess->conn_lock held.
2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2501 with active network interface */
2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2504 struct iscsi_cmd *cmd;
2505 struct iscsi_conn *conn_p;
2509 * Only send a Asynchronous Message on connections whos network
2510 * interface is still functional.
2512 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2513 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2514 iscsit_inc_conn_usage_count(conn_p);
2523 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2525 iscsit_dec_conn_usage_count(conn_p);
2529 cmd->logout_cid = conn->cid;
2530 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2531 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2533 spin_lock_bh(&conn_p->cmd_lock);
2534 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2535 spin_unlock_bh(&conn_p->cmd_lock);
2537 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2538 iscsit_dec_conn_usage_count(conn_p);
2541 static int iscsit_send_conn_drop_async_message(
2542 struct iscsi_cmd *cmd,
2543 struct iscsi_conn *conn)
2545 struct iscsi_async *hdr;
2547 cmd->tx_size = ISCSI_HDR_LEN;
2548 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2550 hdr = (struct iscsi_async *) cmd->pdu;
2551 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2552 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2553 cmd->init_task_tag = RESERVED_ITT;
2554 cmd->targ_xfer_tag = 0xFFFFFFFF;
2555 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2556 cmd->stat_sn = conn->stat_sn++;
2557 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2558 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2559 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2560 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2561 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2562 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2563 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2565 if (conn->conn_ops->HeaderDigest) {
2566 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2568 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2569 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2571 cmd->tx_size += ISCSI_CRC_LEN;
2572 pr_debug("Attaching CRC32C HeaderDigest to"
2573 " Async Message 0x%08x\n", *header_digest);
2576 cmd->iov_misc[0].iov_base = cmd->pdu;
2577 cmd->iov_misc[0].iov_len = cmd->tx_size;
2578 cmd->iov_misc_count = 1;
2580 pr_debug("Sending Connection Dropped Async Message StatSN:"
2581 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2582 cmd->logout_cid, conn->cid);
2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590 wait_for_completion_interruptible_timeout(
2591 &conn->tx_half_close_comp,
2592 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2597 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2598 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2601 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2602 hdr->flags = datain->flags;
2603 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2604 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2605 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2606 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2608 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2609 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2612 hton24(hdr->dlength, datain->length);
2613 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2614 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2615 (struct scsi_lun *)&hdr->lun);
2617 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2619 hdr->itt = cmd->init_task_tag;
2621 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2622 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2624 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2626 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2628 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2630 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2631 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2632 hdr->datasn = cpu_to_be32(datain->data_sn);
2633 hdr->offset = cpu_to_be32(datain->offset);
2635 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2636 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2637 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2638 ntohl(hdr->offset), datain->length, conn->cid);
2641 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2643 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2644 struct iscsi_datain datain;
2645 struct iscsi_datain_req *dr;
2647 u32 iov_count = 0, tx_size = 0;
2648 int eodr = 0, ret, iov_ret;
2649 bool set_statsn = false;
2651 memset(&datain, 0, sizeof(struct iscsi_datain));
2652 dr = iscsit_get_datain_values(cmd, &datain);
2654 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2655 cmd->init_task_tag);
2659 * Be paranoid and double check the logic for now.
2661 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2662 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2663 " datain.length: %u exceeds cmd->data_length: %u\n",
2664 cmd->init_task_tag, datain.offset, datain.length,
2665 cmd->se_cmd.data_length);
2669 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2671 * Special case for successfully execution w/ both DATAIN
2674 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2675 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2676 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2678 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2679 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2680 iscsit_increment_maxcmdsn(cmd, conn->sess);
2681 cmd->stat_sn = conn->stat_sn++;
2683 } else if (dr->dr_complete ==
2684 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2688 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2690 iov = &cmd->iov_data[0];
2691 iov[iov_count].iov_base = cmd->pdu;
2692 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2693 tx_size += ISCSI_HDR_LEN;
2695 if (conn->conn_ops->HeaderDigest) {
2696 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2698 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2699 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2701 iov[0].iov_len += ISCSI_CRC_LEN;
2702 tx_size += ISCSI_CRC_LEN;
2704 pr_debug("Attaching CRC32 HeaderDigest"
2705 " for DataIN PDU 0x%08x\n", *header_digest);
2708 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2709 datain.offset, datain.length);
2713 iov_count += iov_ret;
2714 tx_size += datain.length;
2716 cmd->padding = ((-datain.length) & 3);
2718 iov[iov_count].iov_base = cmd->pad_bytes;
2719 iov[iov_count++].iov_len = cmd->padding;
2720 tx_size += cmd->padding;
2722 pr_debug("Attaching %u padding bytes\n",
2725 if (conn->conn_ops->DataDigest) {
2726 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2727 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2729 iov[iov_count].iov_base = &cmd->data_crc;
2730 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2731 tx_size += ISCSI_CRC_LEN;
2733 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2734 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2737 cmd->iov_data_count = iov_count;
2738 cmd->tx_size = tx_size;
2740 ret = iscsit_fe_sendpage_sg(cmd, conn);
2742 iscsit_unmap_iovec(cmd);
2745 iscsit_tx_thread_wait_for_tcp(conn);
2749 if (dr->dr_complete) {
2750 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2752 iscsit_free_datain_req(cmd, dr);
2759 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2760 struct iscsi_logout_rsp *hdr)
2762 struct iscsi_conn *logout_conn = NULL;
2763 struct iscsi_conn_recovery *cr = NULL;
2764 struct iscsi_session *sess = conn->sess;
2766 * The actual shutting down of Sessions and/or Connections
2767 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2768 * is done in scsi_logout_post_handler().
2770 switch (cmd->logout_reason) {
2771 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2772 pr_debug("iSCSI session logout successful, setting"
2773 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2774 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2776 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2777 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2780 * For CLOSECONNECTION logout requests carrying
2781 * a matching logout CID -> local CID, the reference
2782 * for the local CID will have been incremented in
2783 * iscsi_logout_closeconnection().
2785 * For CLOSECONNECTION logout requests carrying
2786 * a different CID than the connection it arrived
2787 * on, the connection responding to cmd->logout_cid
2788 * is stopped in iscsit_logout_post_handler_diffcid().
2791 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2792 " successful.\n", cmd->logout_cid, conn->cid);
2793 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2795 case ISCSI_LOGOUT_REASON_RECOVERY:
2796 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2797 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2800 * If the connection is still active from our point of view
2801 * force connection recovery to occur.
2803 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2806 iscsit_connection_reinstatement_rcfr(logout_conn);
2807 iscsit_dec_conn_usage_count(logout_conn);
2810 cr = iscsit_get_inactive_connection_recovery_entry(
2811 conn->sess, cmd->logout_cid);
2813 pr_err("Unable to locate CID: %hu for"
2814 " REMOVECONNFORRECOVERY Logout Request.\n",
2816 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2820 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2822 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2823 " for recovery for CID: %hu on CID: %hu successful.\n",
2824 cmd->logout_cid, conn->cid);
2825 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2828 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2829 cmd->logout_reason);
2833 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2834 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2835 hdr->response = cmd->logout_response;
2836 hdr->itt = cmd->init_task_tag;
2837 cmd->stat_sn = conn->stat_sn++;
2838 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2840 iscsit_increment_maxcmdsn(cmd, conn->sess);
2841 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2842 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2844 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2845 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2846 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2847 cmd->logout_cid, conn->cid);
2851 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2854 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2857 int niov = 0, tx_size, rc;
2859 rc = iscsit_build_logout_rsp(cmd, conn,
2860 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2864 tx_size = ISCSI_HDR_LEN;
2865 iov = &cmd->iov_misc[0];
2866 iov[niov].iov_base = cmd->pdu;
2867 iov[niov++].iov_len = ISCSI_HDR_LEN;
2869 if (conn->conn_ops->HeaderDigest) {
2870 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2872 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2873 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2875 iov[0].iov_len += ISCSI_CRC_LEN;
2876 tx_size += ISCSI_CRC_LEN;
2877 pr_debug("Attaching CRC32C HeaderDigest to"
2878 " Logout Response 0x%08x\n", *header_digest);
2880 cmd->iov_misc_count = niov;
2881 cmd->tx_size = tx_size;
2887 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2888 struct iscsi_nopin *hdr, bool nopout_response)
2890 hdr->opcode = ISCSI_OP_NOOP_IN;
2891 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2892 hton24(hdr->dlength, cmd->buf_ptr_size);
2893 if (nopout_response)
2894 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2895 hdr->itt = cmd->init_task_tag;
2896 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2897 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2899 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2901 if (nopout_response)
2902 iscsit_increment_maxcmdsn(cmd, conn->sess);
2904 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2905 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2907 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2908 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2909 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2910 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2912 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2915 * Unsolicited NOPIN, either requesting a response or not.
2917 static int iscsit_send_unsolicited_nopin(
2918 struct iscsi_cmd *cmd,
2919 struct iscsi_conn *conn,
2922 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2923 int tx_size = ISCSI_HDR_LEN, ret;
2925 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2927 if (conn->conn_ops->HeaderDigest) {
2928 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2930 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2931 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2933 tx_size += ISCSI_CRC_LEN;
2934 pr_debug("Attaching CRC32C HeaderDigest to"
2935 " NopIN 0x%08x\n", *header_digest);
2938 cmd->iov_misc[0].iov_base = cmd->pdu;
2939 cmd->iov_misc[0].iov_len = tx_size;
2940 cmd->iov_misc_count = 1;
2941 cmd->tx_size = tx_size;
2943 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2944 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2946 ret = iscsit_send_tx_data(cmd, conn, 1);
2948 iscsit_tx_thread_wait_for_tcp(conn);
2952 spin_lock_bh(&cmd->istate_lock);
2953 cmd->i_state = want_response ?
2954 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2955 spin_unlock_bh(&cmd->istate_lock);
2961 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2963 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2966 int niov = 0, tx_size;
2968 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2970 tx_size = ISCSI_HDR_LEN;
2971 iov = &cmd->iov_misc[0];
2972 iov[niov].iov_base = cmd->pdu;
2973 iov[niov++].iov_len = ISCSI_HDR_LEN;
2975 if (conn->conn_ops->HeaderDigest) {
2976 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2978 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2979 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2981 iov[0].iov_len += ISCSI_CRC_LEN;
2982 tx_size += ISCSI_CRC_LEN;
2983 pr_debug("Attaching CRC32C HeaderDigest"
2984 " to NopIn 0x%08x\n", *header_digest);
2988 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2989 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2991 if (cmd->buf_ptr_size) {
2992 iov[niov].iov_base = cmd->buf_ptr;
2993 iov[niov++].iov_len = cmd->buf_ptr_size;
2994 tx_size += cmd->buf_ptr_size;
2996 pr_debug("Echoing back %u bytes of ping"
2997 " data.\n", cmd->buf_ptr_size);
2999 padding = ((-cmd->buf_ptr_size) & 3);
3001 iov[niov].iov_base = &cmd->pad_bytes;
3002 iov[niov++].iov_len = padding;
3004 pr_debug("Attaching %u additional"
3005 " padding bytes.\n", padding);
3007 if (conn->conn_ops->DataDigest) {
3008 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3009 cmd->buf_ptr, cmd->buf_ptr_size,
3010 padding, (u8 *)&cmd->pad_bytes,
3011 (u8 *)&cmd->data_crc);
3013 iov[niov].iov_base = &cmd->data_crc;
3014 iov[niov++].iov_len = ISCSI_CRC_LEN;
3015 tx_size += ISCSI_CRC_LEN;
3016 pr_debug("Attached DataDigest for %u"
3017 " bytes of ping data, CRC 0x%08x\n",
3018 cmd->buf_ptr_size, cmd->data_crc);
3022 cmd->iov_misc_count = niov;
3023 cmd->tx_size = tx_size;
3028 static int iscsit_send_r2t(
3029 struct iscsi_cmd *cmd,
3030 struct iscsi_conn *conn)
3033 struct iscsi_r2t *r2t;
3034 struct iscsi_r2t_rsp *hdr;
3037 r2t = iscsit_get_r2t_from_list(cmd);
3041 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3042 memset(hdr, 0, ISCSI_HDR_LEN);
3043 hdr->opcode = ISCSI_OP_R2T;
3044 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3045 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3046 (struct scsi_lun *)&hdr->lun);
3047 hdr->itt = cmd->init_task_tag;
3048 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3049 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3050 hdr->statsn = cpu_to_be32(conn->stat_sn);
3051 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3052 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3053 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3054 hdr->data_offset = cpu_to_be32(r2t->offset);
3055 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3057 cmd->iov_misc[0].iov_base = cmd->pdu;
3058 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3059 tx_size += ISCSI_HDR_LEN;
3061 if (conn->conn_ops->HeaderDigest) {
3062 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3064 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3065 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3067 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3068 tx_size += ISCSI_CRC_LEN;
3069 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3070 " PDU 0x%08x\n", *header_digest);
3073 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3074 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3075 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3076 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3077 r2t->offset, r2t->xfer_len, conn->cid);
3079 cmd->iov_misc_count = 1;
3080 cmd->tx_size = tx_size;
3082 spin_lock_bh(&cmd->r2t_lock);
3084 spin_unlock_bh(&cmd->r2t_lock);
3086 ret = iscsit_send_tx_data(cmd, conn, 1);
3088 iscsit_tx_thread_wait_for_tcp(conn);
3092 spin_lock_bh(&cmd->dataout_timeout_lock);
3093 iscsit_start_dataout_timer(cmd, conn);
3094 spin_unlock_bh(&cmd->dataout_timeout_lock);
3100 * @recovery: If called from iscsi_task_reassign_complete_write() for
3101 * connection recovery.
3103 int iscsit_build_r2ts_for_cmd(
3104 struct iscsi_conn *conn,
3105 struct iscsi_cmd *cmd,
3109 u32 offset = 0, xfer_len = 0;
3111 spin_lock_bh(&cmd->r2t_lock);
3112 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3113 spin_unlock_bh(&cmd->r2t_lock);
3117 if (conn->sess->sess_ops->DataSequenceInOrder &&
3119 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3121 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3122 if (conn->sess->sess_ops->DataSequenceInOrder) {
3123 offset = cmd->r2t_offset;
3125 if (first_r2t && recovery) {
3126 int new_data_end = offset +
3127 conn->sess->sess_ops->MaxBurstLength -
3128 cmd->next_burst_len;
3130 if (new_data_end > cmd->se_cmd.data_length)
3131 xfer_len = cmd->se_cmd.data_length - offset;
3134 conn->sess->sess_ops->MaxBurstLength -
3135 cmd->next_burst_len;
3137 int new_data_end = offset +
3138 conn->sess->sess_ops->MaxBurstLength;
3140 if (new_data_end > cmd->se_cmd.data_length)
3141 xfer_len = cmd->se_cmd.data_length - offset;
3143 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3145 cmd->r2t_offset += xfer_len;
3147 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3148 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3150 struct iscsi_seq *seq;
3152 seq = iscsit_get_seq_holder_for_r2t(cmd);
3154 spin_unlock_bh(&cmd->r2t_lock);
3158 offset = seq->offset;
3159 xfer_len = seq->xfer_len;
3161 if (cmd->seq_send_order == cmd->seq_count)
3162 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3164 cmd->outstanding_r2ts++;
3167 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3168 spin_unlock_bh(&cmd->r2t_lock);
3172 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3175 spin_unlock_bh(&cmd->r2t_lock);
3180 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3181 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3184 cmd->stat_sn = conn->stat_sn++;
3186 atomic_long_inc(&conn->sess->rsp_pdus);
3188 memset(hdr, 0, ISCSI_HDR_LEN);
3189 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3190 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3191 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3192 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3193 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3194 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3195 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3196 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198 hdr->response = cmd->iscsi_response;
3199 hdr->cmd_status = cmd->se_cmd.scsi_status;
3200 hdr->itt = cmd->init_task_tag;
3201 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3203 iscsit_increment_maxcmdsn(cmd, conn->sess);
3204 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3205 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3207 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3208 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3209 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3210 cmd->se_cmd.scsi_status, conn->cid);
3212 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3214 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3216 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3218 u32 padding = 0, tx_size = 0;
3220 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3222 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3224 iov = &cmd->iov_misc[0];
3225 iov[iov_count].iov_base = cmd->pdu;
3226 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3227 tx_size += ISCSI_HDR_LEN;
3230 * Attach SENSE DATA payload to iSCSI Response PDU
3232 if (cmd->se_cmd.sense_buffer &&
3233 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3234 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3235 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3236 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3238 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3239 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3240 iov[iov_count].iov_base = cmd->sense_buffer;
3241 iov[iov_count++].iov_len =
3242 (cmd->se_cmd.scsi_sense_length + padding);
3243 tx_size += cmd->se_cmd.scsi_sense_length;
3246 memset(cmd->sense_buffer +
3247 cmd->se_cmd.scsi_sense_length, 0, padding);
3249 pr_debug("Adding %u bytes of padding to"
3250 " SENSE.\n", padding);
3253 if (conn->conn_ops->DataDigest) {
3254 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3256 (cmd->se_cmd.scsi_sense_length + padding),
3257 0, NULL, (u8 *)&cmd->data_crc);
3259 iov[iov_count].iov_base = &cmd->data_crc;
3260 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3261 tx_size += ISCSI_CRC_LEN;
3263 pr_debug("Attaching CRC32 DataDigest for"
3264 " SENSE, %u bytes CRC 0x%08x\n",
3265 (cmd->se_cmd.scsi_sense_length + padding),
3269 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3271 cmd->se_cmd.scsi_sense_length);
3274 if (conn->conn_ops->HeaderDigest) {
3275 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3277 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3278 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3280 iov[0].iov_len += ISCSI_CRC_LEN;
3281 tx_size += ISCSI_CRC_LEN;
3282 pr_debug("Attaching CRC32 HeaderDigest for Response"
3283 " PDU 0x%08x\n", *header_digest);
3286 cmd->iov_misc_count = iov_count;
3287 cmd->tx_size = tx_size;
3292 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3294 switch (se_tmr->response) {
3295 case TMR_FUNCTION_COMPLETE:
3296 return ISCSI_TMF_RSP_COMPLETE;
3297 case TMR_TASK_DOES_NOT_EXIST:
3298 return ISCSI_TMF_RSP_NO_TASK;
3299 case TMR_LUN_DOES_NOT_EXIST:
3300 return ISCSI_TMF_RSP_NO_LUN;
3301 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3302 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3303 case TMR_FUNCTION_REJECTED:
3305 return ISCSI_TMF_RSP_REJECTED;
3310 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3311 struct iscsi_tm_rsp *hdr)
3313 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3315 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3316 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3317 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3318 hdr->itt = cmd->init_task_tag;
3319 cmd->stat_sn = conn->stat_sn++;
3320 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3322 iscsit_increment_maxcmdsn(cmd, conn->sess);
3323 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3324 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3326 pr_debug("Built Task Management Response ITT: 0x%08x,"
3327 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3328 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3330 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3333 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3335 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3338 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3340 cmd->iov_misc[0].iov_base = cmd->pdu;
3341 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3342 tx_size += ISCSI_HDR_LEN;
3344 if (conn->conn_ops->HeaderDigest) {
3345 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3347 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3348 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3350 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3351 tx_size += ISCSI_CRC_LEN;
3352 pr_debug("Attaching CRC32 HeaderDigest for Task"
3353 " Mgmt Response PDU 0x%08x\n", *header_digest);
3356 cmd->iov_misc_count = 1;
3357 cmd->tx_size = tx_size;
3362 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3366 if (np->np_sockaddr.ss_family == AF_INET6) {
3367 const struct sockaddr_in6 sin6 = {
3368 .sin6_addr = IN6ADDR_ANY_INIT };
3369 struct sockaddr_in6 *sock_in6 =
3370 (struct sockaddr_in6 *)&np->np_sockaddr;
3372 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3373 sin6.sin6_addr.s6_addr, 16))
3376 struct sockaddr_in * sock_in =
3377 (struct sockaddr_in *)&np->np_sockaddr;
3379 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3386 #define SENDTARGETS_BUF_LIMIT 32768U
3389 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3390 enum iscsit_transport_type network_transport,
3391 int skip_bytes, bool *completed)
3393 char *payload = NULL;
3394 struct iscsi_conn *conn = cmd->conn;
3395 struct iscsi_portal_group *tpg;
3396 struct iscsi_tiqn *tiqn;
3397 struct iscsi_tpg_np *tpg_np;
3398 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3399 int target_name_printed;
3400 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3401 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3403 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3404 SENDTARGETS_BUF_LIMIT);
3406 payload = kzalloc(buffer_len, GFP_KERNEL);
3408 pr_err("Unable to allocate memory for sendtargets"
3413 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3416 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3417 text_ptr = strchr(text_in, '=');
3419 pr_err("Unable to locate '=' string in text_in:"
3425 * Skip over '=' character..
3430 spin_lock(&tiqn_lock);
3431 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3432 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3433 strcmp(tiqn->tiqn, text_ptr)) {
3437 target_name_printed = 0;
3439 spin_lock(&tiqn->tiqn_tpg_lock);
3440 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3442 /* If demo_mode_discovery=0 and generate_node_acls=0
3443 * (demo mode dislabed) do not return
3444 * TargetName+TargetAddress unless a NodeACL exists.
3447 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3448 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3449 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3450 cmd->conn->sess->sess_ops->InitiatorName))) {
3454 spin_lock(&tpg->tpg_state_lock);
3455 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3456 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3457 spin_unlock(&tpg->tpg_state_lock);
3460 spin_unlock(&tpg->tpg_state_lock);
3462 spin_lock(&tpg->tpg_np_lock);
3463 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3465 struct iscsi_np *np = tpg_np->tpg_np;
3466 bool inaddr_any = iscsit_check_inaddr_any(np);
3469 if (np->np_network_transport != network_transport)
3472 if (!target_name_printed) {
3473 len = sprintf(buf, "TargetName=%s",
3477 if ((len + payload_len) > buffer_len) {
3478 spin_unlock(&tpg->tpg_np_lock);
3479 spin_unlock(&tiqn->tiqn_tpg_lock);
3484 if (skip_bytes && len <= skip_bytes) {
3487 memcpy(payload + payload_len, buf, len);
3489 target_name_printed = 1;
3490 if (len > skip_bytes)
3495 if (np->np_sockaddr.ss_family == AF_INET6)
3496 fmt_str = "TargetAddress=[%s]:%hu,%hu";
3498 fmt_str = "TargetAddress=%s:%hu,%hu";
3500 len = sprintf(buf, fmt_str,
3501 inaddr_any ? conn->local_ip : np->np_ip,
3506 if ((len + payload_len) > buffer_len) {
3507 spin_unlock(&tpg->tpg_np_lock);
3508 spin_unlock(&tiqn->tiqn_tpg_lock);
3513 if (skip_bytes && len <= skip_bytes) {
3516 memcpy(payload + payload_len, buf, len);
3518 if (len > skip_bytes)
3522 spin_unlock(&tpg->tpg_np_lock);
3524 spin_unlock(&tiqn->tiqn_tpg_lock);
3531 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3534 spin_unlock(&tiqn_lock);
3536 cmd->buf_ptr = payload;
3542 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3543 struct iscsi_text_rsp *hdr,
3544 enum iscsit_transport_type network_transport)
3546 int text_length, padding;
3547 bool completed = true;
3549 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3550 cmd->read_data_done,
3552 if (text_length < 0)
3556 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3558 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3559 cmd->read_data_done += text_length;
3560 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3561 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3563 hdr->opcode = ISCSI_OP_TEXT_RSP;
3564 padding = ((-text_length) & 3);
3565 hton24(hdr->dlength, text_length);
3566 hdr->itt = cmd->init_task_tag;
3567 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3568 cmd->stat_sn = conn->stat_sn++;
3569 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3571 iscsit_increment_maxcmdsn(cmd, conn->sess);
3573 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3574 * correctly increment MaxCmdSN for each response answering a
3575 * non immediate text request with a valid CmdSN.
3577 cmd->maxcmdsn_inc = 0;
3578 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3579 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3581 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3582 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3583 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3584 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3585 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3587 return text_length + padding;
3589 EXPORT_SYMBOL(iscsit_build_text_rsp);
3591 static int iscsit_send_text_rsp(
3592 struct iscsi_cmd *cmd,
3593 struct iscsi_conn *conn)
3595 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3598 int text_length, iov_count = 0, rc;
3600 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3605 iov = &cmd->iov_misc[0];
3606 iov[iov_count].iov_base = cmd->pdu;
3607 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3608 iov[iov_count].iov_base = cmd->buf_ptr;
3609 iov[iov_count++].iov_len = text_length;
3611 tx_size += (ISCSI_HDR_LEN + text_length);
3613 if (conn->conn_ops->HeaderDigest) {
3614 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3616 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3617 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3619 iov[0].iov_len += ISCSI_CRC_LEN;
3620 tx_size += ISCSI_CRC_LEN;
3621 pr_debug("Attaching CRC32 HeaderDigest for"
3622 " Text Response PDU 0x%08x\n", *header_digest);
3625 if (conn->conn_ops->DataDigest) {
3626 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3627 cmd->buf_ptr, text_length,
3628 0, NULL, (u8 *)&cmd->data_crc);
3630 iov[iov_count].iov_base = &cmd->data_crc;
3631 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3632 tx_size += ISCSI_CRC_LEN;
3634 pr_debug("Attaching DataDigest for %u bytes of text"
3635 " data, CRC 0x%08x\n", text_length,
3639 cmd->iov_misc_count = iov_count;
3640 cmd->tx_size = tx_size;
3646 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3647 struct iscsi_reject *hdr)
3649 hdr->opcode = ISCSI_OP_REJECT;
3650 hdr->reason = cmd->reject_reason;
3651 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3652 hton24(hdr->dlength, ISCSI_HDR_LEN);
3653 hdr->ffffffff = cpu_to_be32(0xffffffff);
3654 cmd->stat_sn = conn->stat_sn++;
3655 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3656 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3657 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3660 EXPORT_SYMBOL(iscsit_build_reject);
3662 static int iscsit_send_reject(
3663 struct iscsi_cmd *cmd,
3664 struct iscsi_conn *conn)
3666 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3668 u32 iov_count = 0, tx_size;
3670 iscsit_build_reject(cmd, conn, hdr);
3672 iov = &cmd->iov_misc[0];
3673 iov[iov_count].iov_base = cmd->pdu;
3674 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3675 iov[iov_count].iov_base = cmd->buf_ptr;
3676 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3678 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3680 if (conn->conn_ops->HeaderDigest) {
3681 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3683 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3684 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3686 iov[0].iov_len += ISCSI_CRC_LEN;
3687 tx_size += ISCSI_CRC_LEN;
3688 pr_debug("Attaching CRC32 HeaderDigest for"
3689 " REJECT PDU 0x%08x\n", *header_digest);
3692 if (conn->conn_ops->DataDigest) {
3693 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3694 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3696 iov[iov_count].iov_base = &cmd->data_crc;
3697 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3698 tx_size += ISCSI_CRC_LEN;
3699 pr_debug("Attaching CRC32 DataDigest for REJECT"
3700 " PDU 0x%08x\n", cmd->data_crc);
3703 cmd->iov_misc_count = iov_count;
3704 cmd->tx_size = tx_size;
3706 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3707 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3712 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3716 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3717 * within iscsit_start_kthreads()
3719 * Here we use bitmap_id to determine which CPU that this
3720 * iSCSI connection's RX/TX threads will be scheduled to
3723 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3724 for_each_online_cpu(cpu) {
3726 cpumask_set_cpu(cpu, conn->conn_cpumask);
3731 * This should never be reached..
3734 cpumask_setall(conn->conn_cpumask);
3737 static inline void iscsit_thread_check_cpumask(
3738 struct iscsi_conn *conn,
3739 struct task_struct *p,
3743 * mode == 1 signals iscsi_target_tx_thread() usage.
3744 * mode == 0 signals iscsi_target_rx_thread() usage.
3747 if (!conn->conn_tx_reset_cpumask)
3749 conn->conn_tx_reset_cpumask = 0;
3751 if (!conn->conn_rx_reset_cpumask)
3753 conn->conn_rx_reset_cpumask = 0;
3756 * Update the CPU mask for this single kthread so that
3757 * both TX and RX kthreads are scheduled to run on the
3760 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3764 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3769 case ISTATE_SEND_R2T:
3770 ret = iscsit_send_r2t(cmd, conn);
3775 spin_lock_bh(&conn->cmd_lock);
3776 list_del_init(&cmd->i_conn_node);
3777 spin_unlock_bh(&conn->cmd_lock);
3779 iscsit_free_cmd(cmd, false);
3781 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3782 iscsit_mod_nopin_response_timer(conn);
3783 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3787 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3788 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3793 pr_err("Unknown Opcode: 0x%02x ITT:"
3794 " 0x%08x, i_state: %d on CID: %hu\n",
3795 cmd->iscsi_opcode, cmd->init_task_tag, state,
3807 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3809 struct iscsit_transport *t = conn->conn_transport;
3810 struct iscsi_queue_req *qr;
3811 struct iscsi_cmd *cmd;
3815 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3816 atomic_set(&conn->check_immediate_queue, 0);
3819 kmem_cache_free(lio_qr_cache, qr);
3821 ret = t->iscsit_immediate_queue(conn, cmd, state);
3830 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3836 case ISTATE_SEND_DATAIN:
3837 ret = iscsit_send_datain(cmd, conn);
3842 goto check_rsp_state;
3843 else if (ret == 1) {
3845 spin_lock_bh(&cmd->istate_lock);
3846 cmd->i_state = ISTATE_SENT_STATUS;
3847 spin_unlock_bh(&cmd->istate_lock);
3849 if (atomic_read(&conn->check_immediate_queue))
3853 } else if (ret == 2) {
3854 /* Still must send status,
3855 SCF_TRANSPORT_TASK_SENSE was set */
3856 spin_lock_bh(&cmd->istate_lock);
3857 cmd->i_state = ISTATE_SEND_STATUS;
3858 spin_unlock_bh(&cmd->istate_lock);
3859 state = ISTATE_SEND_STATUS;
3860 goto check_rsp_state;
3864 case ISTATE_SEND_STATUS:
3865 case ISTATE_SEND_STATUS_RECOVERY:
3866 ret = iscsit_send_response(cmd, conn);
3868 case ISTATE_SEND_LOGOUTRSP:
3869 ret = iscsit_send_logout(cmd, conn);
3871 case ISTATE_SEND_ASYNCMSG:
3872 ret = iscsit_send_conn_drop_async_message(
3875 case ISTATE_SEND_NOPIN:
3876 ret = iscsit_send_nopin(cmd, conn);
3878 case ISTATE_SEND_REJECT:
3879 ret = iscsit_send_reject(cmd, conn);
3881 case ISTATE_SEND_TASKMGTRSP:
3882 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3885 ret = iscsit_tmr_post_handler(cmd, conn);
3887 iscsit_fall_back_to_erl0(conn->sess);
3889 case ISTATE_SEND_TEXTRSP:
3890 ret = iscsit_send_text_rsp(cmd, conn);
3893 pr_err("Unknown Opcode: 0x%02x ITT:"
3894 " 0x%08x, i_state: %d on CID: %hu\n",
3895 cmd->iscsi_opcode, cmd->init_task_tag,
3902 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3903 iscsit_tx_thread_wait_for_tcp(conn);
3904 iscsit_unmap_iovec(cmd);
3907 iscsit_unmap_iovec(cmd);
3910 case ISTATE_SEND_LOGOUTRSP:
3911 if (!iscsit_logout_post_handler(cmd, conn))
3914 case ISTATE_SEND_STATUS:
3915 case ISTATE_SEND_ASYNCMSG:
3916 case ISTATE_SEND_NOPIN:
3917 case ISTATE_SEND_STATUS_RECOVERY:
3918 case ISTATE_SEND_TEXTRSP:
3919 case ISTATE_SEND_TASKMGTRSP:
3920 case ISTATE_SEND_REJECT:
3921 spin_lock_bh(&cmd->istate_lock);
3922 cmd->i_state = ISTATE_SENT_STATUS;
3923 spin_unlock_bh(&cmd->istate_lock);
3926 pr_err("Unknown Opcode: 0x%02x ITT:"
3927 " 0x%08x, i_state: %d on CID: %hu\n",
3928 cmd->iscsi_opcode, cmd->init_task_tag,
3929 cmd->i_state, conn->cid);
3933 if (atomic_read(&conn->check_immediate_queue))
3942 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3944 struct iscsit_transport *t = conn->conn_transport;
3945 struct iscsi_queue_req *qr;
3946 struct iscsi_cmd *cmd;
3950 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3953 kmem_cache_free(lio_qr_cache, qr);
3955 ret = t->iscsit_response_queue(conn, cmd, state);
3956 if (ret == 1 || ret < 0)
3963 int iscsi_target_tx_thread(void *arg)
3966 struct iscsi_conn *conn = arg;
3968 * Allow ourselves to be interrupted by SIGINT so that a
3969 * connection recovery / failure event can be triggered externally.
3971 allow_signal(SIGINT);
3973 while (!kthread_should_stop()) {
3975 * Ensure that both TX and RX per connection kthreads
3976 * are scheduled to run on the same CPU.
3978 iscsit_thread_check_cpumask(conn, current, 1);
3980 wait_event_interruptible(conn->queues_wq,
3981 !iscsit_conn_all_queues_empty(conn));
3983 if (signal_pending(current))
3987 ret = iscsit_handle_immediate_queue(conn);
3991 ret = iscsit_handle_response_queue(conn);
3994 else if (ret == -ECONNRESET)
4002 * Avoid the normal connection failure code-path if this connection
4003 * is still within LOGIN mode, and iscsi_np process context is
4004 * responsible for cleaning up the early connection failure.
4006 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
4007 iscsit_take_action_for_connection_exit(conn);
4012 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4014 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4015 struct iscsi_cmd *cmd;
4018 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4019 case ISCSI_OP_SCSI_CMD:
4020 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4024 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4026 case ISCSI_OP_SCSI_DATA_OUT:
4027 ret = iscsit_handle_data_out(conn, buf);
4029 case ISCSI_OP_NOOP_OUT:
4031 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4032 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4036 ret = iscsit_handle_nop_out(conn, cmd, buf);
4038 case ISCSI_OP_SCSI_TMFUNC:
4039 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4043 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4046 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4047 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4051 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4056 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4058 case ISCSI_OP_LOGOUT:
4059 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4063 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4065 wait_for_completion_timeout(&conn->conn_logout_comp,
4066 SECONDS_FOR_LOGOUT_COMP * HZ);
4068 case ISCSI_OP_SNACK:
4069 ret = iscsit_handle_snack(conn, buf);
4072 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4073 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4074 pr_err("Cannot recover from unknown"
4075 " opcode while ERL=0, closing iSCSI connection.\n");
4078 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4079 " closing iSCSI connection.\n");
4086 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4089 int iscsi_target_rx_thread(void *arg)
4092 u8 buffer[ISCSI_HDR_LEN], opcode;
4093 u32 checksum = 0, digest = 0;
4094 struct iscsi_conn *conn = arg;
4097 * Allow ourselves to be interrupted by SIGINT so that a
4098 * connection recovery / failure event can be triggered externally.
4100 allow_signal(SIGINT);
4102 * Wait for iscsi_post_login_handler() to complete before allowing
4103 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4105 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4109 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4110 struct completion comp;
4112 init_completion(&comp);
4113 rc = wait_for_completion_interruptible(&comp);
4120 while (!kthread_should_stop()) {
4122 * Ensure that both TX and RX per connection kthreads
4123 * are scheduled to run on the same CPU.
4125 iscsit_thread_check_cpumask(conn, current, 0);
4127 memset(buffer, 0, ISCSI_HDR_LEN);
4128 memset(&iov, 0, sizeof(struct kvec));
4130 iov.iov_base = buffer;
4131 iov.iov_len = ISCSI_HDR_LEN;
4133 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4134 if (ret != ISCSI_HDR_LEN) {
4135 iscsit_rx_thread_wait_for_tcp(conn);
4139 if (conn->conn_ops->HeaderDigest) {
4140 iov.iov_base = &digest;
4141 iov.iov_len = ISCSI_CRC_LEN;
4143 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4144 if (ret != ISCSI_CRC_LEN) {
4145 iscsit_rx_thread_wait_for_tcp(conn);
4149 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4150 buffer, ISCSI_HDR_LEN,
4151 0, NULL, (u8 *)&checksum);
4153 if (digest != checksum) {
4154 pr_err("HeaderDigest CRC32C failed,"
4155 " received 0x%08x, computed 0x%08x\n",
4158 * Set the PDU to 0xff so it will intentionally
4159 * hit default in the switch below.
4161 memset(buffer, 0xff, ISCSI_HDR_LEN);
4162 atomic_long_inc(&conn->sess->conn_digest_errors);
4164 pr_debug("Got HeaderDigest CRC32C"
4165 " 0x%08x\n", checksum);
4169 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4172 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4174 if (conn->sess->sess_ops->SessionType &&
4175 ((!(opcode & ISCSI_OP_TEXT)) ||
4176 (!(opcode & ISCSI_OP_LOGOUT)))) {
4177 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4178 " while in Discovery Session, rejecting.\n", opcode);
4179 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4184 ret = iscsi_target_rx_opcode(conn, buffer);
4190 if (!signal_pending(current))
4191 atomic_set(&conn->transport_failed, 1);
4192 iscsit_take_action_for_connection_exit(conn);
4196 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4198 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4199 struct iscsi_session *sess = conn->sess;
4201 * We expect this function to only ever be called from either RX or TX
4202 * thread context via iscsit_close_connection() once the other context
4203 * has been reset -> returned sleeping pre-handler state.
4205 spin_lock_bh(&conn->cmd_lock);
4206 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4208 list_del_init(&cmd->i_conn_node);
4209 spin_unlock_bh(&conn->cmd_lock);
4211 iscsit_increment_maxcmdsn(cmd, sess);
4213 iscsit_free_cmd(cmd, true);
4215 spin_lock_bh(&conn->cmd_lock);
4217 spin_unlock_bh(&conn->cmd_lock);
4220 static void iscsit_stop_timers_for_cmds(
4221 struct iscsi_conn *conn)
4223 struct iscsi_cmd *cmd;
4225 spin_lock_bh(&conn->cmd_lock);
4226 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4227 if (cmd->data_direction == DMA_TO_DEVICE)
4228 iscsit_stop_dataout_timer(cmd);
4230 spin_unlock_bh(&conn->cmd_lock);
4233 int iscsit_close_connection(
4234 struct iscsi_conn *conn)
4236 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4237 struct iscsi_session *sess = conn->sess;
4239 pr_debug("Closing iSCSI connection CID %hu on SID:"
4240 " %u\n", conn->cid, sess->sid);
4242 * Always up conn_logout_comp for the traditional TCP case just in case
4243 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4244 * response never got sent because the connection failed.
4246 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4247 * to signal logout response TX interrupt completion. Go ahead and skip
4248 * this for iser since isert_rx_opcode() does not wait on logout failure,
4249 * and to avoid iscsi_conn pointer dereference in iser-target code.
4251 if (conn->conn_transport->transport_type == ISCSI_TCP)
4252 complete(&conn->conn_logout_comp);
4254 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4255 if (conn->tx_thread &&
4256 cmpxchg(&conn->tx_thread_active, true, false)) {
4257 send_sig(SIGINT, conn->tx_thread, 1);
4258 kthread_stop(conn->tx_thread);
4260 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4261 if (conn->rx_thread &&
4262 cmpxchg(&conn->rx_thread_active, true, false)) {
4263 send_sig(SIGINT, conn->rx_thread, 1);
4264 kthread_stop(conn->rx_thread);
4268 spin_lock(&iscsit_global->ts_bitmap_lock);
4269 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4271 spin_unlock(&iscsit_global->ts_bitmap_lock);
4273 iscsit_stop_timers_for_cmds(conn);
4274 iscsit_stop_nopin_response_timer(conn);
4275 iscsit_stop_nopin_timer(conn);
4277 if (conn->conn_transport->iscsit_wait_conn)
4278 conn->conn_transport->iscsit_wait_conn(conn);
4281 * During Connection recovery drop unacknowledged out of order
4282 * commands for this connection, and prepare the other commands
4285 * During normal operation clear the out of order commands (but
4286 * do not free the struct iscsi_ooo_cmdsn's) and release all
4287 * struct iscsi_cmds.
4289 if (atomic_read(&conn->connection_recovery)) {
4290 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4291 iscsit_prepare_cmds_for_realligance(conn);
4293 iscsit_clear_ooo_cmdsns_for_conn(conn);
4294 iscsit_release_commands_from_conn(conn);
4296 iscsit_free_queue_reqs_for_conn(conn);
4299 * Handle decrementing session or connection usage count if
4300 * a logout response was not able to be sent because the
4301 * connection failed. Fall back to Session Recovery here.
4303 if (atomic_read(&conn->conn_logout_remove)) {
4304 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4305 iscsit_dec_conn_usage_count(conn);
4306 iscsit_dec_session_usage_count(sess);
4308 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4309 iscsit_dec_conn_usage_count(conn);
4311 atomic_set(&conn->conn_logout_remove, 0);
4312 atomic_set(&sess->session_reinstatement, 0);
4313 atomic_set(&sess->session_fall_back_to_erl0, 1);
4316 spin_lock_bh(&sess->conn_lock);
4317 list_del(&conn->conn_list);
4320 * Attempt to let the Initiator know this connection failed by
4321 * sending an Connection Dropped Async Message on another
4322 * active connection.
4324 if (atomic_read(&conn->connection_recovery))
4325 iscsit_build_conn_drop_async_message(conn);
4327 spin_unlock_bh(&sess->conn_lock);
4330 * If connection reinstatement is being performed on this connection,
4331 * up the connection reinstatement semaphore that is being blocked on
4332 * in iscsit_cause_connection_reinstatement().
4334 spin_lock_bh(&conn->state_lock);
4335 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4336 spin_unlock_bh(&conn->state_lock);
4337 complete(&conn->conn_wait_comp);
4338 wait_for_completion(&conn->conn_post_wait_comp);
4339 spin_lock_bh(&conn->state_lock);
4343 * If connection reinstatement is being performed on this connection
4344 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4345 * connection wait rcfr semaphore that is being blocked on
4346 * an iscsit_connection_reinstatement_rcfr().
4348 if (atomic_read(&conn->connection_wait_rcfr)) {
4349 spin_unlock_bh(&conn->state_lock);
4350 complete(&conn->conn_wait_rcfr_comp);
4351 wait_for_completion(&conn->conn_post_wait_comp);
4352 spin_lock_bh(&conn->state_lock);
4354 atomic_set(&conn->connection_reinstatement, 1);
4355 spin_unlock_bh(&conn->state_lock);
4358 * If any other processes are accessing this connection pointer we
4359 * must wait until they have completed.
4361 iscsit_check_conn_usage_count(conn);
4363 if (conn->conn_rx_hash.tfm)
4364 crypto_free_hash(conn->conn_rx_hash.tfm);
4365 if (conn->conn_tx_hash.tfm)
4366 crypto_free_hash(conn->conn_tx_hash.tfm);
4368 free_cpumask_var(conn->conn_cpumask);
4370 kfree(conn->conn_ops);
4371 conn->conn_ops = NULL;
4374 sock_release(conn->sock);
4376 if (conn->conn_transport->iscsit_free_conn)
4377 conn->conn_transport->iscsit_free_conn(conn);
4379 iscsit_put_transport(conn->conn_transport);
4381 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4382 conn->conn_state = TARG_CONN_STATE_FREE;
4385 spin_lock_bh(&sess->conn_lock);
4386 atomic_dec(&sess->nconn);
4387 pr_debug("Decremented iSCSI connection count to %hu from node:"
4388 " %s\n", atomic_read(&sess->nconn),
4389 sess->sess_ops->InitiatorName);
4391 * Make sure that if one connection fails in an non ERL=2 iSCSI
4392 * Session that they all fail.
4394 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4395 !atomic_read(&sess->session_logout))
4396 atomic_set(&sess->session_fall_back_to_erl0, 1);
4399 * If this was not the last connection in the session, and we are
4400 * performing session reinstatement or falling back to ERL=0, call
4401 * iscsit_stop_session() without sleeping to shutdown the other
4402 * active connections.
4404 if (atomic_read(&sess->nconn)) {
4405 if (!atomic_read(&sess->session_reinstatement) &&
4406 !atomic_read(&sess->session_fall_back_to_erl0)) {
4407 spin_unlock_bh(&sess->conn_lock);
4410 if (!atomic_read(&sess->session_stop_active)) {
4411 atomic_set(&sess->session_stop_active, 1);
4412 spin_unlock_bh(&sess->conn_lock);
4413 iscsit_stop_session(sess, 0, 0);
4416 spin_unlock_bh(&sess->conn_lock);
4421 * If this was the last connection in the session and one of the
4422 * following is occurring:
4424 * Session Reinstatement is not being performed, and are falling back
4425 * to ERL=0 call iscsit_close_session().
4427 * Session Logout was requested. iscsit_close_session() will be called
4430 * Session Continuation is not being performed, start the Time2Retain
4431 * handler and check if sleep_on_sess_wait_sem is active.
4433 if (!atomic_read(&sess->session_reinstatement) &&
4434 atomic_read(&sess->session_fall_back_to_erl0)) {
4435 spin_unlock_bh(&sess->conn_lock);
4436 target_put_session(sess->se_sess);
4439 } else if (atomic_read(&sess->session_logout)) {
4440 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4441 sess->session_state = TARG_SESS_STATE_FREE;
4442 spin_unlock_bh(&sess->conn_lock);
4444 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4445 complete(&sess->session_wait_comp);
4449 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4450 sess->session_state = TARG_SESS_STATE_FAILED;
4452 if (!atomic_read(&sess->session_continuation)) {
4453 spin_unlock_bh(&sess->conn_lock);
4454 iscsit_start_time2retain_handler(sess);
4456 spin_unlock_bh(&sess->conn_lock);
4458 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4459 complete(&sess->session_wait_comp);
4463 spin_unlock_bh(&sess->conn_lock);
4468 int iscsit_close_session(struct iscsi_session *sess)
4470 struct iscsi_portal_group *tpg = sess->tpg;
4471 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4473 if (atomic_read(&sess->nconn)) {
4474 pr_err("%d connection(s) still exist for iSCSI session"
4475 " to %s\n", atomic_read(&sess->nconn),
4476 sess->sess_ops->InitiatorName);
4480 spin_lock_bh(&se_tpg->session_lock);
4481 atomic_set(&sess->session_logout, 1);
4482 atomic_set(&sess->session_reinstatement, 1);
4483 iscsit_stop_time2retain_timer(sess);
4484 spin_unlock_bh(&se_tpg->session_lock);
4487 * transport_deregister_session_configfs() will clear the
4488 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4489 * can be setting it again with __transport_register_session() in
4490 * iscsi_post_login_handler() again after the iscsit_stop_session()
4491 * completes in iscsi_np context.
4493 transport_deregister_session_configfs(sess->se_sess);
4496 * If any other processes are accessing this session pointer we must
4497 * wait until they have completed. If we are in an interrupt (the
4498 * time2retain handler) and contain and active session usage count we
4499 * restart the timer and exit.
4501 if (!in_interrupt()) {
4502 if (iscsit_check_session_usage_count(sess) == 1)
4503 iscsit_stop_session(sess, 1, 1);
4505 if (iscsit_check_session_usage_count(sess) == 2) {
4506 atomic_set(&sess->session_logout, 0);
4507 iscsit_start_time2retain_handler(sess);
4512 transport_deregister_session(sess->se_sess);
4514 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4515 iscsit_free_connection_recovery_entires(sess);
4517 iscsit_free_all_ooo_cmdsns(sess);
4519 spin_lock_bh(&se_tpg->session_lock);
4520 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4521 sess->session_state = TARG_SESS_STATE_FREE;
4522 pr_debug("Released iSCSI session from node: %s\n",
4523 sess->sess_ops->InitiatorName);
4526 tpg->tpg_tiqn->tiqn_nsessions--;
4528 pr_debug("Decremented number of active iSCSI Sessions on"
4529 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4531 spin_lock(&sess_idr_lock);
4532 idr_remove(&sess_idr, sess->session_index);
4533 spin_unlock(&sess_idr_lock);
4535 kfree(sess->sess_ops);
4536 sess->sess_ops = NULL;
4537 spin_unlock_bh(&se_tpg->session_lock);
4543 static void iscsit_logout_post_handler_closesession(
4544 struct iscsi_conn *conn)
4546 struct iscsi_session *sess = conn->sess;
4549 * Traditional iscsi/tcp will invoke this logic from TX thread
4550 * context during session logout, so clear tx_thread_active and
4551 * sleep if iscsit_close_connection() has not already occured.
4553 * Since iser-target invokes this logic from it's own workqueue,
4554 * always sleep waiting for RX/TX thread shutdown to complete
4555 * within iscsit_close_connection().
4557 if (conn->conn_transport->transport_type == ISCSI_TCP)
4558 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4560 atomic_set(&conn->conn_logout_remove, 0);
4561 complete(&conn->conn_logout_comp);
4563 iscsit_dec_conn_usage_count(conn);
4564 iscsit_stop_session(sess, sleep, sleep);
4565 iscsit_dec_session_usage_count(sess);
4566 target_put_session(sess->se_sess);
4569 static void iscsit_logout_post_handler_samecid(
4570 struct iscsi_conn *conn)
4574 if (conn->conn_transport->transport_type == ISCSI_TCP)
4575 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4577 atomic_set(&conn->conn_logout_remove, 0);
4578 complete(&conn->conn_logout_comp);
4580 iscsit_cause_connection_reinstatement(conn, sleep);
4581 iscsit_dec_conn_usage_count(conn);
4584 static void iscsit_logout_post_handler_diffcid(
4585 struct iscsi_conn *conn,
4588 struct iscsi_conn *l_conn;
4589 struct iscsi_session *sess = conn->sess;
4590 bool conn_found = false;
4595 spin_lock_bh(&sess->conn_lock);
4596 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4597 if (l_conn->cid == cid) {
4598 iscsit_inc_conn_usage_count(l_conn);
4603 spin_unlock_bh(&sess->conn_lock);
4609 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4611 spin_lock_bh(&l_conn->state_lock);
4612 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4613 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4614 spin_unlock_bh(&l_conn->state_lock);
4616 iscsit_cause_connection_reinstatement(l_conn, 1);
4617 iscsit_dec_conn_usage_count(l_conn);
4621 * Return of 0 causes the TX thread to restart.
4623 int iscsit_logout_post_handler(
4624 struct iscsi_cmd *cmd,
4625 struct iscsi_conn *conn)
4629 switch (cmd->logout_reason) {
4630 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4631 switch (cmd->logout_response) {
4632 case ISCSI_LOGOUT_SUCCESS:
4633 case ISCSI_LOGOUT_CLEANUP_FAILED:
4635 iscsit_logout_post_handler_closesession(conn);
4640 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4641 if (conn->cid == cmd->logout_cid) {
4642 switch (cmd->logout_response) {
4643 case ISCSI_LOGOUT_SUCCESS:
4644 case ISCSI_LOGOUT_CLEANUP_FAILED:
4646 iscsit_logout_post_handler_samecid(conn);
4651 switch (cmd->logout_response) {
4652 case ISCSI_LOGOUT_SUCCESS:
4653 iscsit_logout_post_handler_diffcid(conn,
4656 case ISCSI_LOGOUT_CID_NOT_FOUND:
4657 case ISCSI_LOGOUT_CLEANUP_FAILED:
4664 case ISCSI_LOGOUT_REASON_RECOVERY:
4665 switch (cmd->logout_response) {
4666 case ISCSI_LOGOUT_SUCCESS:
4667 case ISCSI_LOGOUT_CID_NOT_FOUND:
4668 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4669 case ISCSI_LOGOUT_CLEANUP_FAILED:
4681 EXPORT_SYMBOL(iscsit_logout_post_handler);
4683 void iscsit_fail_session(struct iscsi_session *sess)
4685 struct iscsi_conn *conn;
4687 spin_lock_bh(&sess->conn_lock);
4688 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4689 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4690 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4692 spin_unlock_bh(&sess->conn_lock);
4694 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4695 sess->session_state = TARG_SESS_STATE_FAILED;
4698 int iscsit_free_session(struct iscsi_session *sess)
4700 u16 conn_count = atomic_read(&sess->nconn);
4701 struct iscsi_conn *conn, *conn_tmp = NULL;
4704 spin_lock_bh(&sess->conn_lock);
4705 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4707 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4709 if (conn_count == 0)
4712 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4715 iscsit_inc_conn_usage_count(conn_tmp);
4718 iscsit_inc_conn_usage_count(conn);
4720 spin_unlock_bh(&sess->conn_lock);
4721 iscsit_cause_connection_reinstatement(conn, 1);
4722 spin_lock_bh(&sess->conn_lock);
4724 iscsit_dec_conn_usage_count(conn);
4726 iscsit_dec_conn_usage_count(conn_tmp);
4731 if (atomic_read(&sess->nconn)) {
4732 spin_unlock_bh(&sess->conn_lock);
4733 wait_for_completion(&sess->session_wait_comp);
4735 spin_unlock_bh(&sess->conn_lock);
4737 target_put_session(sess->se_sess);
4741 void iscsit_stop_session(
4742 struct iscsi_session *sess,
4744 int connection_sleep)
4746 u16 conn_count = atomic_read(&sess->nconn);
4747 struct iscsi_conn *conn, *conn_tmp = NULL;
4750 spin_lock_bh(&sess->conn_lock);
4752 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4754 if (connection_sleep) {
4755 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4757 if (conn_count == 0)
4760 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4763 iscsit_inc_conn_usage_count(conn_tmp);
4766 iscsit_inc_conn_usage_count(conn);
4768 spin_unlock_bh(&sess->conn_lock);
4769 iscsit_cause_connection_reinstatement(conn, 1);
4770 spin_lock_bh(&sess->conn_lock);
4772 iscsit_dec_conn_usage_count(conn);
4774 iscsit_dec_conn_usage_count(conn_tmp);
4778 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4779 iscsit_cause_connection_reinstatement(conn, 0);
4782 if (session_sleep && atomic_read(&sess->nconn)) {
4783 spin_unlock_bh(&sess->conn_lock);
4784 wait_for_completion(&sess->session_wait_comp);
4786 spin_unlock_bh(&sess->conn_lock);
4789 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4791 struct iscsi_session *sess;
4792 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4793 struct se_session *se_sess, *se_sess_tmp;
4794 LIST_HEAD(free_list);
4795 int session_count = 0;
4797 spin_lock_bh(&se_tpg->session_lock);
4798 if (tpg->nsessions && !force) {
4799 spin_unlock_bh(&se_tpg->session_lock);
4803 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4805 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4807 spin_lock(&sess->conn_lock);
4808 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4809 atomic_read(&sess->session_logout) ||
4810 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4811 spin_unlock(&sess->conn_lock);
4814 atomic_set(&sess->session_reinstatement, 1);
4815 spin_unlock(&sess->conn_lock);
4817 list_move_tail(&se_sess->sess_list, &free_list);
4819 spin_unlock_bh(&se_tpg->session_lock);
4821 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4822 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4824 iscsit_free_session(sess);
4828 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4829 " Group: %hu\n", session_count, tpg->tpgt);
4833 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4834 MODULE_VERSION("4.1.x");
4835 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4836 MODULE_LICENSE("GPL");
4838 module_init(iscsi_target_init_module);
4839 module_exit(iscsi_target_cleanup_module);