1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
50 #include <target/iscsi/iscsi_transport.h>
52 static LIST_HEAD(g_tiqn_list);
53 static LIST_HEAD(g_np_list);
54 static DEFINE_SPINLOCK(tiqn_lock);
55 static DEFINE_SPINLOCK(np_lock);
57 static struct idr tiqn_idr;
59 struct mutex auth_id_lock;
60 spinlock_t sess_idr_lock;
62 struct iscsit_global *iscsit_global;
64 struct kmem_cache *lio_qr_cache;
65 struct kmem_cache *lio_dr_cache;
66 struct kmem_cache *lio_ooo_cache;
67 struct kmem_cache *lio_r2t_cache;
69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
70 struct iscsi_scsi_req *, u32);
72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 struct iscsi_tiqn *tiqn = NULL;
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
87 spin_unlock(&tiqn->tiqn_state_lock);
90 spin_unlock(&tiqn_lock);
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
103 spin_unlock(&tiqn->tiqn_state_lock);
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 struct iscsi_tiqn *tiqn = NULL;
124 if (strlen(buf) >= ISCSI_IQN_LEN) {
125 pr_err("Target IQN exceeds %d bytes\n",
127 return ERR_PTR(-EINVAL);
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
145 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
147 idr_preload(GFP_KERNEL);
148 spin_lock(&tiqn_lock);
150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
153 spin_unlock(&tiqn_lock);
158 tiqn->tiqn_index = ret;
159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
161 spin_unlock(&tiqn_lock);
164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
173 * Wait for accesses to said struct iscsi_tiqn to end.
175 spin_lock(&tiqn->tiqn_state_lock);
176 while (tiqn->tiqn_access_count != 0) {
177 spin_unlock(&tiqn->tiqn_state_lock);
179 spin_lock(&tiqn->tiqn_state_lock);
181 spin_unlock(&tiqn->tiqn_state_lock);
184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
188 * while holding tiqn->tiqn_state_lock. This means that all subsequent
189 * attempts to access this struct iscsi_tiqn will fail from both transport
190 * fabric and control code paths.
192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
193 pr_err("iscsit_set_tiqn_shutdown() failed\n");
197 iscsit_wait_for_tiqn(tiqn);
199 spin_lock(&tiqn_lock);
200 list_del(&tiqn->tiqn_list);
201 idr_remove(&tiqn_idr, tiqn->tiqn_index);
202 spin_unlock(&tiqn_lock);
204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
213 * Determine if the network portal is accepting storage traffic.
215 spin_lock_bh(&np->np_thread_lock);
216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
217 spin_unlock_bh(&np->np_thread_lock);
220 spin_unlock_bh(&np->np_thread_lock);
222 * Determine if the portal group is accepting storage traffic.
224 spin_lock_bh(&tpg->tpg_state_lock);
225 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
226 spin_unlock_bh(&tpg->tpg_state_lock);
229 spin_unlock_bh(&tpg->tpg_state_lock);
232 * Here we serialize access across the TIQN+TPG Tuple.
234 ret = down_interruptible(&tpg->np_login_sem);
235 if ((ret != 0) || signal_pending(current))
238 spin_lock_bh(&tpg->tpg_state_lock);
239 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
240 spin_unlock_bh(&tpg->tpg_state_lock);
241 up(&tpg->np_login_sem);
244 spin_unlock_bh(&tpg->tpg_state_lock);
249 void iscsit_login_kref_put(struct kref *kref)
251 struct iscsi_tpg_np *tpg_np = container_of(kref,
252 struct iscsi_tpg_np, tpg_np_kref);
254 complete(&tpg_np->tpg_np_comp);
257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
258 struct iscsi_tpg_np *tpg_np)
260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
262 up(&tpg->np_login_sem);
265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
268 iscsit_put_tiqn_for_login(tiqn);
273 bool iscsit_check_np_match(
274 struct __kernel_sockaddr_storage *sockaddr,
276 int network_transport)
278 struct sockaddr_in *sock_in, *sock_in_e;
279 struct sockaddr_in6 *sock_in6, *sock_in6_e;
280 bool ip_match = false;
283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
287 if (!memcmp(&sock_in6->sin6_addr.in6_u,
288 &sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
292 port = ntohs(sock_in6->sin6_port);
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
300 port = ntohs(sock_in->sin_port);
303 if ((ip_match == true) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport))
310 static struct iscsi_np *iscsit_get_np(
311 struct __kernel_sockaddr_storage *sockaddr,
312 int network_transport)
317 spin_lock_bh(&np_lock);
318 list_for_each_entry(np, &g_np_list, np_list) {
319 spin_lock(&np->np_thread_lock);
320 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
321 spin_unlock(&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(&np->np_thread_lock);
334 spin_unlock_bh(&np_lock);
337 spin_unlock(&np->np_thread_lock);
339 spin_unlock_bh(&np_lock);
344 struct iscsi_np *iscsit_add_np(
345 struct __kernel_sockaddr_storage *sockaddr,
347 int network_transport)
349 struct sockaddr_in *sock_in;
350 struct sockaddr_in6 *sock_in6;
354 * Locate the existing struct iscsi_np if already active..
356 np = iscsit_get_np(sockaddr, network_transport);
360 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
362 pr_err("Unable to allocate memory for struct iscsi_np\n");
363 return ERR_PTR(-ENOMEM);
366 np->np_flags |= NPF_IP_NETWORK;
367 if (sockaddr->ss_family == AF_INET6) {
368 sock_in6 = (struct sockaddr_in6 *)sockaddr;
369 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
370 np->np_port = ntohs(sock_in6->sin6_port);
372 sock_in = (struct sockaddr_in *)sockaddr;
373 sprintf(np->np_ip, "%s", ip_str);
374 np->np_port = ntohs(sock_in->sin_port);
377 np->np_network_transport = network_transport;
378 spin_lock_init(&np->np_thread_lock);
379 init_completion(&np->np_restart_comp);
380 INIT_LIST_HEAD(&np->np_list);
382 ret = iscsi_target_setup_login_socket(np, sockaddr);
388 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
389 if (IS_ERR(np->np_thread)) {
390 pr_err("Unable to create kthread: iscsi_np\n");
391 ret = PTR_ERR(np->np_thread);
396 * Increment the np_exports reference count now to prevent
397 * iscsit_del_np() below from being run while a new call to
398 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
399 * active. We don't need to hold np->np_thread_lock at this
400 * point because iscsi_np has not been added to g_np_list yet.
404 spin_lock_bh(&np_lock);
405 list_add_tail(&np->np_list, &g_np_list);
406 spin_unlock_bh(&np_lock);
408 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
409 np->np_ip, np->np_port, np->np_transport->name);
414 int iscsit_reset_np_thread(
416 struct iscsi_tpg_np *tpg_np,
417 struct iscsi_portal_group *tpg,
420 spin_lock_bh(&np->np_thread_lock);
421 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
422 spin_unlock_bh(&np->np_thread_lock);
425 np->np_thread_state = ISCSI_NP_THREAD_RESET;
428 spin_unlock_bh(&np->np_thread_lock);
429 send_sig(SIGINT, np->np_thread, 1);
430 wait_for_completion(&np->np_restart_comp);
431 spin_lock_bh(&np->np_thread_lock);
433 spin_unlock_bh(&np->np_thread_lock);
435 if (tpg_np && shutdown) {
436 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
438 wait_for_completion(&tpg_np->tpg_np_comp);
444 static void iscsit_free_np(struct iscsi_np *np)
447 sock_release(np->np_socket);
450 int iscsit_del_np(struct iscsi_np *np)
452 spin_lock_bh(&np->np_thread_lock);
454 if (np->np_exports) {
455 spin_unlock_bh(&np->np_thread_lock);
458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
459 spin_unlock_bh(&np->np_thread_lock);
463 * We need to send the signal to wakeup Linux/Net
464 * which may be sleeping in sock_accept()..
466 send_sig(SIGINT, np->np_thread, 1);
467 kthread_stop(np->np_thread);
470 np->np_transport->iscsit_free_np(np);
472 spin_lock_bh(&np_lock);
473 list_del(&np->np_list);
474 spin_unlock_bh(&np_lock);
476 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
477 np->np_ip, np->np_port, np->np_transport->name);
479 iscsit_put_transport(np->np_transport);
484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
489 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
493 static struct iscsit_transport iscsi_target_transport = {
495 .transport_type = ISCSI_TCP,
497 .iscsit_setup_np = iscsit_setup_np,
498 .iscsit_accept_np = iscsit_accept_np,
499 .iscsit_free_np = iscsit_free_np,
500 .iscsit_get_login_rx = iscsit_get_login_rx,
501 .iscsit_put_login_tx = iscsit_put_login_tx,
502 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
503 .iscsit_immediate_queue = iscsit_immediate_queue,
504 .iscsit_response_queue = iscsit_response_queue,
505 .iscsit_queue_data_in = iscsit_queue_rsp,
506 .iscsit_queue_status = iscsit_queue_rsp,
509 static int __init iscsi_target_init_module(void)
513 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
515 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
516 if (!iscsit_global) {
517 pr_err("Unable to allocate memory for iscsit_global\n");
520 mutex_init(&auth_id_lock);
521 spin_lock_init(&sess_idr_lock);
525 ret = iscsi_target_register_configfs();
529 ret = iscsi_thread_set_init();
533 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
534 TARGET_THREAD_SET_COUNT) {
535 pr_err("iscsi_allocate_thread_sets() returned"
536 " unexpected value!\n");
540 lio_qr_cache = kmem_cache_create("lio_qr_cache",
541 sizeof(struct iscsi_queue_req),
542 __alignof__(struct iscsi_queue_req), 0, NULL);
544 pr_err("nable to kmem_cache_create() for"
549 lio_dr_cache = kmem_cache_create("lio_dr_cache",
550 sizeof(struct iscsi_datain_req),
551 __alignof__(struct iscsi_datain_req), 0, NULL);
553 pr_err("Unable to kmem_cache_create() for"
558 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
559 sizeof(struct iscsi_ooo_cmdsn),
560 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
561 if (!lio_ooo_cache) {
562 pr_err("Unable to kmem_cache_create() for"
567 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
568 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
570 if (!lio_r2t_cache) {
571 pr_err("Unable to kmem_cache_create() for"
576 iscsit_register_transport(&iscsi_target_transport);
578 if (iscsit_load_discovery_tpg() < 0)
583 kmem_cache_destroy(lio_r2t_cache);
585 kmem_cache_destroy(lio_ooo_cache);
587 kmem_cache_destroy(lio_dr_cache);
589 kmem_cache_destroy(lio_qr_cache);
591 iscsi_deallocate_thread_sets();
593 iscsi_thread_set_free();
595 iscsi_target_deregister_configfs();
597 kfree(iscsit_global);
601 static void __exit iscsi_target_cleanup_module(void)
603 iscsi_deallocate_thread_sets();
604 iscsi_thread_set_free();
605 iscsit_release_discovery_tpg();
606 iscsit_unregister_transport(&iscsi_target_transport);
607 kmem_cache_destroy(lio_qr_cache);
608 kmem_cache_destroy(lio_dr_cache);
609 kmem_cache_destroy(lio_ooo_cache);
610 kmem_cache_destroy(lio_r2t_cache);
612 iscsi_target_deregister_configfs();
614 kfree(iscsit_global);
617 static int iscsit_add_reject(
618 struct iscsi_conn *conn,
622 struct iscsi_cmd *cmd;
624 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
628 cmd->iscsi_opcode = ISCSI_OP_REJECT;
629 cmd->reject_reason = reason;
631 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
633 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
634 iscsit_free_cmd(cmd, false);
638 spin_lock_bh(&conn->cmd_lock);
639 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
640 spin_unlock_bh(&conn->cmd_lock);
642 cmd->i_state = ISTATE_SEND_REJECT;
643 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
648 static int iscsit_add_reject_from_cmd(
649 struct iscsi_cmd *cmd,
654 struct iscsi_conn *conn;
657 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
663 cmd->iscsi_opcode = ISCSI_OP_REJECT;
664 cmd->reject_reason = reason;
666 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
668 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
669 iscsit_free_cmd(cmd, false);
674 spin_lock_bh(&conn->cmd_lock);
675 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
676 spin_unlock_bh(&conn->cmd_lock);
679 cmd->i_state = ISTATE_SEND_REJECT;
680 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
682 * Perform the kref_put now if se_cmd has already been setup by
683 * scsit_setup_scsi_cmd()
685 if (cmd->se_cmd.se_tfo != NULL) {
686 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
687 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
692 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
695 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
698 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
700 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
704 * Map some portion of the allocated scatterlist to an iovec, suitable for
705 * kernel sockets to copy data in/out.
707 static int iscsit_map_iovec(
708 struct iscsi_cmd *cmd,
714 struct scatterlist *sg;
715 unsigned int page_off;
718 * We know each entry in t_data_sg contains a page.
720 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
721 page_off = (data_offset % PAGE_SIZE);
723 cmd->first_data_sg = sg;
724 cmd->first_data_sg_off = page_off;
726 while (data_length) {
727 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
729 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
730 iov[i].iov_len = cur_len;
732 data_length -= cur_len;
738 cmd->kmapped_nents = i;
743 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
746 struct scatterlist *sg;
748 sg = cmd->first_data_sg;
750 for (i = 0; i < cmd->kmapped_nents; i++)
751 kunmap(sg_page(&sg[i]));
754 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
757 struct iscsi_cmd *cmd, *cmd_p;
759 conn->exp_statsn = exp_statsn;
761 if (conn->sess->sess_ops->RDMAExtensions)
764 spin_lock_bh(&conn->cmd_lock);
765 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
766 spin_lock(&cmd->istate_lock);
767 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
768 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
769 cmd->i_state = ISTATE_REMOVE;
770 spin_unlock(&cmd->istate_lock);
771 list_move_tail(&cmd->i_conn_node, &ack_list);
774 spin_unlock(&cmd->istate_lock);
776 spin_unlock_bh(&conn->cmd_lock);
778 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
779 list_del(&cmd->i_conn_node);
780 iscsit_free_cmd(cmd, false);
784 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
786 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
788 iov_count += ISCSI_IOV_DATA_BUFFER;
790 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
791 if (!cmd->iov_data) {
792 pr_err("Unable to allocate cmd->iov_data\n");
796 cmd->orig_iov_data_count = iov_count;
800 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
803 int data_direction, payload_length;
804 struct iscsi_scsi_req *hdr;
808 spin_lock_bh(&conn->sess->session_stats_lock);
809 conn->sess->cmd_pdus++;
810 if (conn->sess->se_sess->se_node_acl) {
811 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
812 conn->sess->se_sess->se_node_acl->num_cmds++;
813 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
815 spin_unlock_bh(&conn->sess->session_stats_lock);
817 hdr = (struct iscsi_scsi_req *) buf;
818 payload_length = ntoh24(hdr->dlength);
820 /* FIXME; Add checks for AdditionalHeaderSegment */
822 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
823 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
824 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
825 " not set. Bad iSCSI Initiator.\n");
826 return iscsit_add_reject_cmd(cmd,
827 ISCSI_REASON_BOOKMARK_INVALID, buf);
830 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
831 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
833 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
834 * that adds support for RESERVE/RELEASE. There is a bug
835 * add with this new functionality that sets R/W bits when
836 * neither CDB carries any READ or WRITE datapayloads.
838 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
839 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
840 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
844 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
845 " set when Expected Data Transfer Length is 0 for"
846 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
847 return iscsit_add_reject_cmd(cmd,
848 ISCSI_REASON_BOOKMARK_INVALID, buf);
852 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
853 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
854 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
855 " MUST be set if Expected Data Transfer Length is not 0."
856 " Bad iSCSI Initiator\n");
857 return iscsit_add_reject_cmd(cmd,
858 ISCSI_REASON_BOOKMARK_INVALID, buf);
861 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
862 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
863 pr_err("Bidirectional operations not supported!\n");
864 return iscsit_add_reject_cmd(cmd,
865 ISCSI_REASON_BOOKMARK_INVALID, buf);
868 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
869 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
870 " Scsi Command PDU.\n");
871 return iscsit_add_reject_cmd(cmd,
872 ISCSI_REASON_BOOKMARK_INVALID, buf);
875 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
876 pr_err("ImmediateData=No but DataSegmentLength=%u,"
877 " protocol error.\n", payload_length);
878 return iscsit_add_reject_cmd(cmd,
879 ISCSI_REASON_PROTOCOL_ERROR, buf);
882 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
883 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
884 pr_err("Expected Data Transfer Length and Length of"
885 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
886 " bit is not set protocol error\n");
887 return iscsit_add_reject_cmd(cmd,
888 ISCSI_REASON_PROTOCOL_ERROR, buf);
891 if (payload_length > be32_to_cpu(hdr->data_length)) {
892 pr_err("DataSegmentLength: %u is greater than"
893 " EDTL: %u, protocol error.\n", payload_length,
895 return iscsit_add_reject_cmd(cmd,
896 ISCSI_REASON_PROTOCOL_ERROR, buf);
899 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
900 pr_err("DataSegmentLength: %u is greater than"
901 " MaxXmitDataSegmentLength: %u, protocol error.\n",
902 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
903 return iscsit_add_reject_cmd(cmd,
904 ISCSI_REASON_PROTOCOL_ERROR, buf);
907 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
908 pr_err("DataSegmentLength: %u is greater than"
909 " FirstBurstLength: %u, protocol error.\n",
910 payload_length, conn->sess->sess_ops->FirstBurstLength);
911 return iscsit_add_reject_cmd(cmd,
912 ISCSI_REASON_BOOKMARK_INVALID, buf);
915 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
916 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
919 cmd->data_direction = data_direction;
920 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
922 * Figure out the SAM Task Attribute for the incoming SCSI CDB
924 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
925 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
926 sam_task_attr = MSG_SIMPLE_TAG;
927 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
928 sam_task_attr = MSG_ORDERED_TAG;
929 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
930 sam_task_attr = MSG_HEAD_TAG;
931 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
932 sam_task_attr = MSG_ACA_TAG;
934 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
935 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
936 sam_task_attr = MSG_SIMPLE_TAG;
939 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
940 cmd->i_state = ISTATE_NEW_CMD;
941 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
942 cmd->immediate_data = (payload_length) ? 1 : 0;
943 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
944 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
945 if (cmd->unsolicited_data)
946 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
948 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
949 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
950 spin_lock_bh(&conn->sess->ttt_lock);
951 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
952 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
953 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
954 spin_unlock_bh(&conn->sess->ttt_lock);
955 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
956 cmd->targ_xfer_tag = 0xFFFFFFFF;
957 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
958 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
959 cmd->first_burst_len = payload_length;
961 if (!conn->sess->sess_ops->RDMAExtensions &&
962 cmd->data_direction == DMA_FROM_DEVICE) {
963 struct iscsi_datain_req *dr;
965 dr = iscsit_allocate_datain_req();
967 return iscsit_add_reject_cmd(cmd,
968 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
970 iscsit_attach_datain_req(cmd, dr);
974 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
976 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
977 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
978 cmd->data_direction, sam_task_attr,
979 cmd->sense_buffer + 2);
981 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
982 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
983 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
986 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
988 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
989 scsilun_to_int(&hdr->lun));
990 if (cmd->sense_reason)
993 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
994 if (cmd->sense_reason) {
995 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
996 return iscsit_add_reject_cmd(cmd,
997 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1003 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1004 return iscsit_add_reject_cmd(cmd,
1005 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1009 spin_lock_bh(&conn->cmd_lock);
1010 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1011 spin_unlock_bh(&conn->cmd_lock);
1013 * Check if we need to delay processing because of ALUA
1014 * Active/NonOptimized primary access state..
1016 core_alua_check_nonop_delay(&cmd->se_cmd);
1020 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1022 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1024 iscsit_set_dataout_sequence_values(cmd);
1026 spin_lock_bh(&cmd->dataout_timeout_lock);
1027 iscsit_start_dataout_timer(cmd, cmd->conn);
1028 spin_unlock_bh(&cmd->dataout_timeout_lock);
1030 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1032 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1033 struct iscsi_scsi_req *hdr)
1037 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1038 * the Immediate Bit is not set, and no Immediate
1041 * A PDU/CmdSN carrying Immediate Data can only
1042 * be processed after the DataCRC has passed.
1043 * If the DataCRC fails, the CmdSN MUST NOT
1044 * be acknowledged. (See below)
1046 if (!cmd->immediate_data) {
1047 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1048 (unsigned char *)hdr, hdr->cmdsn);
1049 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1051 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1052 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1057 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1060 * If no Immediate Data is attached, it's OK to return now.
1062 if (!cmd->immediate_data) {
1063 if (!cmd->sense_reason && cmd->unsolicited_data)
1064 iscsit_set_unsoliticed_dataout(cmd);
1065 if (!cmd->sense_reason)
1068 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1073 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1074 * execution. These exceptions are processed in CmdSN order using
1075 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1077 if (cmd->sense_reason) {
1078 if (cmd->reject_reason)
1084 * Call directly into transport_generic_new_cmd() to perform
1085 * the backend memory allocation.
1087 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1088 if (cmd->sense_reason)
1093 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1096 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1099 struct iscsi_conn *conn = cmd->conn;
1100 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1102 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1104 if (dump_payload == true)
1105 goto after_immediate_data;
1107 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1108 cmd->first_burst_len);
1109 after_immediate_data:
1110 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1112 * A PDU/CmdSN carrying Immediate Data passed
1113 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1114 * Immediate Bit is not set.
1116 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1117 (unsigned char *)hdr, hdr->cmdsn);
1118 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1121 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1124 rc = iscsit_dump_data_payload(cmd->conn,
1125 cmd->first_burst_len, 1);
1126 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1128 } else if (cmd->unsolicited_data)
1129 iscsit_set_unsoliticed_dataout(cmd);
1131 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1133 * Immediate Data failed DataCRC and ERL>=1,
1134 * silently drop this PDU and let the initiator
1135 * plug the CmdSN gap.
1137 * FIXME: Send Unsolicited NOPIN with reserved
1138 * TTT here to help the initiator figure out
1139 * the missing CmdSN, although they should be
1140 * intelligent enough to determine the missing
1141 * CmdSN and issue a retry to plug the sequence.
1143 cmd->i_state = ISTATE_REMOVE;
1144 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1145 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1152 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1155 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1157 bool dump_payload = false;
1159 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1163 * Allocation iovecs needed for struct socket operations for
1164 * traditional iSCSI block I/O.
1166 if (iscsit_allocate_iovecs(cmd) < 0) {
1167 return iscsit_add_reject_cmd(cmd,
1168 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1170 immed_data = cmd->immediate_data;
1172 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1176 dump_payload = true;
1181 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1184 static u32 iscsit_do_crypto_hash_sg(
1185 struct hash_desc *hash,
1186 struct iscsi_cmd *cmd,
1194 struct scatterlist *sg;
1195 unsigned int page_off;
1197 crypto_hash_init(hash);
1199 sg = cmd->first_data_sg;
1200 page_off = cmd->first_data_sg_off;
1203 while (data_length) {
1204 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1206 crypto_hash_update(hash, &sg[i], cur_len);
1208 data_length -= cur_len;
1214 struct scatterlist pad_sg;
1216 sg_init_one(&pad_sg, pad_bytes, padding);
1217 crypto_hash_update(hash, &pad_sg, padding);
1219 crypto_hash_final(hash, (u8 *) &data_crc);
1224 static void iscsit_do_crypto_hash_buf(
1225 struct hash_desc *hash,
1232 struct scatterlist sg;
1234 crypto_hash_init(hash);
1236 sg_init_one(&sg, buf, payload_length);
1237 crypto_hash_update(hash, &sg, payload_length);
1240 sg_init_one(&sg, pad_bytes, padding);
1241 crypto_hash_update(hash, &sg, padding);
1243 crypto_hash_final(hash, data_crc);
1247 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1248 struct iscsi_cmd **out_cmd)
1250 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1251 struct iscsi_cmd *cmd = NULL;
1252 struct se_cmd *se_cmd;
1253 u32 payload_length = ntoh24(hdr->dlength);
1256 if (!payload_length) {
1257 pr_err("DataOUT payload is ZERO, protocol error.\n");
1258 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1263 spin_lock_bh(&conn->sess->session_stats_lock);
1264 conn->sess->rx_data_octets += payload_length;
1265 if (conn->sess->se_sess->se_node_acl) {
1266 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1267 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1268 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1270 spin_unlock_bh(&conn->sess->session_stats_lock);
1272 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1273 pr_err("DataSegmentLength: %u is greater than"
1274 " MaxXmitDataSegmentLength: %u\n", payload_length,
1275 conn->conn_ops->MaxXmitDataSegmentLength);
1276 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1280 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1285 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1286 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1287 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1288 payload_length, conn->cid);
1290 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1291 pr_err("Command ITT: 0x%08x received DataOUT after"
1292 " last DataOUT received, dumping payload\n",
1293 cmd->init_task_tag);
1294 return iscsit_dump_data_payload(conn, payload_length, 1);
1297 if (cmd->data_direction != DMA_TO_DEVICE) {
1298 pr_err("Command ITT: 0x%08x received DataOUT for a"
1299 " NON-WRITE command.\n", cmd->init_task_tag);
1300 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1302 se_cmd = &cmd->se_cmd;
1303 iscsit_mod_dataout_timer(cmd);
1305 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1306 pr_err("DataOut Offset: %u, Length %u greater than"
1307 " iSCSI Command EDTL %u, protocol error.\n",
1308 hdr->offset, payload_length, cmd->se_cmd.data_length);
1309 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1312 if (cmd->unsolicited_data) {
1313 int dump_unsolicited_data = 0;
1315 if (conn->sess->sess_ops->InitialR2T) {
1316 pr_err("Received unexpected unsolicited data"
1317 " while InitialR2T=Yes, protocol error.\n");
1318 transport_send_check_condition_and_sense(&cmd->se_cmd,
1319 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1323 * Special case for dealing with Unsolicited DataOUT
1324 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1328 /* Something's amiss if we're not in WRITE_PENDING state... */
1329 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1330 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1331 dump_unsolicited_data = 1;
1333 if (dump_unsolicited_data) {
1335 * Check if a delayed TASK_ABORTED status needs to
1336 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1337 * received with the unsolicitied data out.
1339 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1340 iscsit_stop_dataout_timer(cmd);
1342 transport_check_aborted_status(se_cmd,
1343 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1344 return iscsit_dump_data_payload(conn, payload_length, 1);
1348 * For the normal solicited data path:
1350 * Check for a delayed TASK_ABORTED status and dump any
1351 * incoming data out payload if one exists. Also, when the
1352 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1353 * data out sequence, we decrement outstanding_r2ts. Once
1354 * outstanding_r2ts reaches zero, go ahead and send the delayed
1355 * TASK_ABORTED status.
1357 if (se_cmd->transport_state & CMD_T_ABORTED) {
1358 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1359 if (--cmd->outstanding_r2ts < 1) {
1360 iscsit_stop_dataout_timer(cmd);
1361 transport_check_aborted_status(
1365 return iscsit_dump_data_payload(conn, payload_length, 1);
1369 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1370 * within-command recovery checks before receiving the payload.
1372 rc = iscsit_check_pre_dataout(cmd, buf);
1373 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1375 else if (rc == DATAOUT_CANNOT_RECOVER)
1381 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1384 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1385 struct iscsi_data *hdr)
1388 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1389 u32 payload_length = ntoh24(hdr->dlength);
1390 int iov_ret, data_crc_failed = 0;
1392 rx_size += payload_length;
1393 iov = &cmd->iov_data[0];
1395 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1400 iov_count += iov_ret;
1402 padding = ((-payload_length) & 3);
1404 iov[iov_count].iov_base = cmd->pad_bytes;
1405 iov[iov_count++].iov_len = padding;
1407 pr_debug("Receiving %u padding bytes.\n", padding);
1410 if (conn->conn_ops->DataDigest) {
1411 iov[iov_count].iov_base = &checksum;
1412 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1413 rx_size += ISCSI_CRC_LEN;
1416 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1418 iscsit_unmap_iovec(cmd);
1420 if (rx_got != rx_size)
1423 if (conn->conn_ops->DataDigest) {
1426 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1427 be32_to_cpu(hdr->offset),
1428 payload_length, padding,
1431 if (checksum != data_crc) {
1432 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1433 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1434 " does not match computed 0x%08x\n",
1435 hdr->itt, hdr->offset, payload_length,
1436 hdr->datasn, checksum, data_crc);
1437 data_crc_failed = 1;
1439 pr_debug("Got CRC32C DataDigest 0x%08x for"
1440 " %u bytes of Data Out\n", checksum,
1445 return data_crc_failed;
1449 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1450 bool data_crc_failed)
1452 struct iscsi_conn *conn = cmd->conn;
1455 * Increment post receive data and CRC values or perform
1456 * within-command recovery.
1458 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1459 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1461 else if (rc == DATAOUT_SEND_R2T) {
1462 iscsit_set_dataout_sequence_values(cmd);
1463 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1464 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1466 * Handle extra special case for out of order
1467 * Unsolicited Data Out.
1469 spin_lock_bh(&cmd->istate_lock);
1470 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1471 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1472 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1473 spin_unlock_bh(&cmd->istate_lock);
1475 iscsit_stop_dataout_timer(cmd);
1478 target_execute_cmd(&cmd->se_cmd);
1480 } else /* DATAOUT_CANNOT_RECOVER */
1485 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1487 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1489 struct iscsi_cmd *cmd;
1490 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1492 bool data_crc_failed = false;
1494 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1500 rc = iscsit_get_dataout(conn, cmd, hdr);
1504 data_crc_failed = true;
1506 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1509 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1510 struct iscsi_nopout *hdr)
1512 u32 payload_length = ntoh24(hdr->dlength);
1514 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1515 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1516 " not set, protocol error.\n");
1518 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1519 (unsigned char *)hdr);
1521 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1522 (unsigned char *)hdr);
1525 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1526 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1527 " greater than MaxXmitDataSegmentLength: %u, protocol"
1528 " error.\n", payload_length,
1529 conn->conn_ops->MaxXmitDataSegmentLength);
1531 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1532 (unsigned char *)hdr);
1534 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1535 (unsigned char *)hdr);
1538 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1539 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1540 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1541 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1544 * This is not a response to a Unsolicited NopIN, which means
1545 * it can either be a NOPOUT ping request (with a valid ITT),
1546 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1547 * Either way, make sure we allocate an struct iscsi_cmd, as both
1548 * can contain ping data.
1550 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1551 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1552 cmd->i_state = ISTATE_SEND_NOPIN;
1553 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1555 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1556 cmd->targ_xfer_tag = 0xFFFFFFFF;
1557 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1558 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1559 cmd->data_direction = DMA_NONE;
1564 EXPORT_SYMBOL(iscsit_setup_nop_out);
1566 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1567 struct iscsi_nopout *hdr)
1569 struct iscsi_cmd *cmd_p = NULL;
1572 * Initiator is expecting a NopIN ping reply..
1574 if (hdr->itt != RESERVED_ITT) {
1577 spin_lock_bh(&conn->cmd_lock);
1578 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1579 spin_unlock_bh(&conn->cmd_lock);
1581 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1583 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1584 iscsit_add_cmd_to_response_queue(cmd, conn,
1589 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1590 (unsigned char *)hdr, hdr->cmdsn);
1591 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1593 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1599 * This was a response to a unsolicited NOPIN ping.
1601 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1602 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1606 iscsit_stop_nopin_response_timer(conn);
1608 cmd_p->i_state = ISTATE_REMOVE;
1609 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1611 iscsit_start_nopin_timer(conn);
1615 * Otherwise, initiator is not expecting a NOPIN is response.
1616 * Just ignore for now.
1620 EXPORT_SYMBOL(iscsit_process_nop_out);
1622 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1625 unsigned char *ping_data = NULL;
1626 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1627 struct kvec *iov = NULL;
1628 u32 payload_length = ntoh24(hdr->dlength);
1631 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1635 * Handle NOP-OUT payload for traditional iSCSI sockets
1637 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1638 u32 checksum, data_crc, padding = 0;
1639 int niov = 0, rx_got, rx_size = payload_length;
1641 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1643 pr_err("Unable to allocate memory for"
1644 " NOPOUT ping data.\n");
1649 iov = &cmd->iov_misc[0];
1650 iov[niov].iov_base = ping_data;
1651 iov[niov++].iov_len = payload_length;
1653 padding = ((-payload_length) & 3);
1655 pr_debug("Receiving %u additional bytes"
1656 " for padding.\n", padding);
1657 iov[niov].iov_base = &cmd->pad_bytes;
1658 iov[niov++].iov_len = padding;
1661 if (conn->conn_ops->DataDigest) {
1662 iov[niov].iov_base = &checksum;
1663 iov[niov++].iov_len = ISCSI_CRC_LEN;
1664 rx_size += ISCSI_CRC_LEN;
1667 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1668 if (rx_got != rx_size) {
1673 if (conn->conn_ops->DataDigest) {
1674 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1675 ping_data, payload_length,
1676 padding, cmd->pad_bytes,
1679 if (checksum != data_crc) {
1680 pr_err("Ping data CRC32C DataDigest"
1681 " 0x%08x does not match computed 0x%08x\n",
1682 checksum, data_crc);
1683 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1684 pr_err("Unable to recover from"
1685 " NOPOUT Ping DataCRC failure while in"
1691 * Silently drop this PDU and let the
1692 * initiator plug the CmdSN gap.
1694 pr_debug("Dropping NOPOUT"
1695 " Command CmdSN: 0x%08x due to"
1696 " DataCRC error.\n", hdr->cmdsn);
1701 pr_debug("Got CRC32C DataDigest"
1702 " 0x%08x for %u bytes of ping data.\n",
1703 checksum, payload_length);
1707 ping_data[payload_length] = '\0';
1709 * Attach ping data to struct iscsi_cmd->buf_ptr.
1711 cmd->buf_ptr = ping_data;
1712 cmd->buf_ptr_size = payload_length;
1714 pr_debug("Got %u bytes of NOPOUT ping"
1715 " data.\n", payload_length);
1716 pr_debug("Ping Data: \"%s\"\n", ping_data);
1719 return iscsit_process_nop_out(conn, cmd, hdr);
1722 iscsit_free_cmd(cmd, false);
1729 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1732 struct se_tmr_req *se_tmr;
1733 struct iscsi_tmr_req *tmr_req;
1734 struct iscsi_tm *hdr;
1735 int out_of_order_cmdsn = 0, ret;
1736 bool sess_ref = false;
1739 hdr = (struct iscsi_tm *) buf;
1740 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1741 function = hdr->flags;
1743 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1744 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1745 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1746 hdr->rtt, hdr->refcmdsn, conn->cid);
1748 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1749 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1750 hdr->rtt != RESERVED_ITT)) {
1751 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1752 hdr->rtt = RESERVED_ITT;
1755 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1756 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1757 pr_err("Task Management Request TASK_REASSIGN not"
1758 " issued as immediate command, bad iSCSI Initiator"
1759 "implementation\n");
1760 return iscsit_add_reject_cmd(cmd,
1761 ISCSI_REASON_PROTOCOL_ERROR, buf);
1763 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1764 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1765 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1767 cmd->data_direction = DMA_NONE;
1769 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1770 if (!cmd->tmr_req) {
1771 pr_err("Unable to allocate memory for"
1772 " Task Management command!\n");
1773 return iscsit_add_reject_cmd(cmd,
1774 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1779 * TASK_REASSIGN for ERL=2 / connection stays inside of
1780 * LIO-Target $FABRIC_MOD
1782 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1787 transport_init_se_cmd(&cmd->se_cmd,
1788 &lio_target_fabric_configfs->tf_ops,
1789 conn->sess->se_sess, 0, DMA_NONE,
1790 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1792 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1796 case ISCSI_TM_FUNC_ABORT_TASK:
1797 tcm_function = TMR_ABORT_TASK;
1799 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1800 tcm_function = TMR_ABORT_TASK_SET;
1802 case ISCSI_TM_FUNC_CLEAR_ACA:
1803 tcm_function = TMR_CLEAR_ACA;
1805 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1806 tcm_function = TMR_CLEAR_TASK_SET;
1808 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1809 tcm_function = TMR_LUN_RESET;
1811 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1812 tcm_function = TMR_TARGET_WARM_RESET;
1814 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1815 tcm_function = TMR_TARGET_COLD_RESET;
1818 pr_err("Unknown iSCSI TMR Function:"
1819 " 0x%02x\n", function);
1820 return iscsit_add_reject_cmd(cmd,
1821 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1824 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1825 tcm_function, GFP_KERNEL);
1827 return iscsit_add_reject_cmd(cmd,
1828 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1830 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1833 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1834 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1835 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1836 cmd->init_task_tag = hdr->itt;
1837 cmd->targ_xfer_tag = 0xFFFFFFFF;
1838 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1839 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1840 se_tmr = cmd->se_cmd.se_tmr_req;
1841 tmr_req = cmd->tmr_req;
1843 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1845 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1846 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1847 scsilun_to_int(&hdr->lun));
1849 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1855 case ISCSI_TM_FUNC_ABORT_TASK:
1856 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1857 if (se_tmr->response)
1860 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1861 case ISCSI_TM_FUNC_CLEAR_ACA:
1862 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1863 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1865 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1866 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1867 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1871 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1872 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1873 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1877 case ISCSI_TM_FUNC_TASK_REASSIGN:
1878 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1880 * Perform sanity checks on the ExpDataSN only if the
1881 * TASK_REASSIGN was successful.
1883 if (se_tmr->response)
1886 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1887 return iscsit_add_reject_cmd(cmd,
1888 ISCSI_REASON_BOOKMARK_INVALID, buf);
1891 pr_err("Unknown TMR function: 0x%02x, protocol"
1892 " error.\n", function);
1893 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1897 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1898 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1899 se_tmr->call_transport = 1;
1901 spin_lock_bh(&conn->cmd_lock);
1902 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1903 spin_unlock_bh(&conn->cmd_lock);
1905 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1906 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1907 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1908 out_of_order_cmdsn = 1;
1909 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1911 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1914 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1916 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1919 * Found the referenced task, send to transport for processing.
1921 if (se_tmr->call_transport)
1922 return transport_generic_handle_tmr(&cmd->se_cmd);
1925 * Could not find the referenced LUN, task, or Task Management
1926 * command not authorized or supported. Change state and
1927 * let the tx_thread send the response.
1929 * For connection recovery, this is also the default action for
1930 * TMR TASK_REASSIGN.
1933 pr_debug("Handle TMR, using sess_ref=true check\n");
1934 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1937 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1940 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1942 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1944 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1945 struct iscsi_text *hdr)
1947 u32 payload_length = ntoh24(hdr->dlength);
1949 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1950 pr_err("Unable to accept text parameter length: %u"
1951 "greater than MaxXmitDataSegmentLength %u.\n",
1952 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1953 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1954 (unsigned char *)hdr);
1957 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1958 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1959 hdr->exp_statsn, payload_length);
1961 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1962 cmd->i_state = ISTATE_SEND_TEXTRSP;
1963 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1964 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1965 cmd->targ_xfer_tag = 0xFFFFFFFF;
1966 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1967 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1968 cmd->data_direction = DMA_NONE;
1972 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1975 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1976 struct iscsi_text *hdr)
1978 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1982 pr_err("Unable to locate text_in buffer for sendtargets"
1986 if (strncmp("SendTargets", text_in, 11) != 0) {
1987 pr_err("Received Text Data that is not"
1988 " SendTargets, cannot continue.\n");
1991 text_ptr = strchr(text_in, '=');
1993 pr_err("No \"=\" separator found in Text Data,"
1994 " cannot continue.\n");
1997 if (!strncmp("=All", text_ptr, 4)) {
1998 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
1999 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2000 !strncmp("=eui.", text_ptr, 5)) {
2001 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2003 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2007 spin_lock_bh(&conn->cmd_lock);
2008 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2009 spin_unlock_bh(&conn->cmd_lock);
2011 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2013 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2014 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2015 (unsigned char *)hdr, hdr->cmdsn);
2016 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2022 return iscsit_execute_cmd(cmd, 0);
2025 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2026 (unsigned char *)hdr);
2028 EXPORT_SYMBOL(iscsit_process_text_cmd);
2031 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2034 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2035 char *text_in = NULL;
2036 u32 payload_length = ntoh24(hdr->dlength);
2039 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2043 rx_size = payload_length;
2044 if (payload_length) {
2045 u32 checksum = 0, data_crc = 0;
2046 u32 padding = 0, pad_bytes = 0;
2047 int niov = 0, rx_got;
2050 text_in = kzalloc(payload_length, GFP_KERNEL);
2052 pr_err("Unable to allocate memory for"
2053 " incoming text parameters\n");
2056 cmd->text_in_ptr = text_in;
2058 memset(iov, 0, 3 * sizeof(struct kvec));
2059 iov[niov].iov_base = text_in;
2060 iov[niov++].iov_len = payload_length;
2062 padding = ((-payload_length) & 3);
2064 iov[niov].iov_base = &pad_bytes;
2065 iov[niov++].iov_len = padding;
2067 pr_debug("Receiving %u additional bytes"
2068 " for padding.\n", padding);
2070 if (conn->conn_ops->DataDigest) {
2071 iov[niov].iov_base = &checksum;
2072 iov[niov++].iov_len = ISCSI_CRC_LEN;
2073 rx_size += ISCSI_CRC_LEN;
2076 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2077 if (rx_got != rx_size)
2080 if (conn->conn_ops->DataDigest) {
2081 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2082 text_in, payload_length,
2083 padding, (u8 *)&pad_bytes,
2086 if (checksum != data_crc) {
2087 pr_err("Text data CRC32C DataDigest"
2088 " 0x%08x does not match computed"
2089 " 0x%08x\n", checksum, data_crc);
2090 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2091 pr_err("Unable to recover from"
2092 " Text Data digest failure while in"
2097 * Silently drop this PDU and let the
2098 * initiator plug the CmdSN gap.
2100 pr_debug("Dropping Text"
2101 " Command CmdSN: 0x%08x due to"
2102 " DataCRC error.\n", hdr->cmdsn);
2107 pr_debug("Got CRC32C DataDigest"
2108 " 0x%08x for %u bytes of text data.\n",
2109 checksum, payload_length);
2112 text_in[payload_length - 1] = '\0';
2113 pr_debug("Successfully read %d bytes of text"
2114 " data.\n", payload_length);
2117 return iscsit_process_text_cmd(conn, cmd, hdr);
2120 kfree(cmd->text_in_ptr);
2121 cmd->text_in_ptr = NULL;
2122 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2124 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2126 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2128 struct iscsi_conn *conn_p;
2129 struct iscsi_session *sess = conn->sess;
2131 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2132 " for SID: %u.\n", conn->cid, conn->sess->sid);
2134 atomic_set(&sess->session_logout, 1);
2135 atomic_set(&conn->conn_logout_remove, 1);
2136 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2138 iscsit_inc_conn_usage_count(conn);
2139 iscsit_inc_session_usage_count(sess);
2141 spin_lock_bh(&sess->conn_lock);
2142 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2143 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2146 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2147 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2149 spin_unlock_bh(&sess->conn_lock);
2151 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2156 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2158 struct iscsi_conn *l_conn;
2159 struct iscsi_session *sess = conn->sess;
2161 pr_debug("Received logout request CLOSECONNECTION for CID:"
2162 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2165 * A Logout Request with a CLOSECONNECTION reason code for a CID
2166 * can arrive on a connection with a differing CID.
2168 if (conn->cid == cmd->logout_cid) {
2169 spin_lock_bh(&conn->state_lock);
2170 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2171 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2173 atomic_set(&conn->conn_logout_remove, 1);
2174 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2175 iscsit_inc_conn_usage_count(conn);
2177 spin_unlock_bh(&conn->state_lock);
2180 * Handle all different cid CLOSECONNECTION requests in
2181 * iscsit_logout_post_handler_diffcid() as to give enough
2182 * time for any non immediate command's CmdSN to be
2183 * acknowledged on the connection in question.
2185 * Here we simply make sure the CID is still around.
2187 l_conn = iscsit_get_conn_from_cid(sess,
2190 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2191 iscsit_add_cmd_to_response_queue(cmd, conn,
2196 iscsit_dec_conn_usage_count(l_conn);
2199 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2204 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2206 struct iscsi_session *sess = conn->sess;
2208 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2209 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2211 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2212 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2213 " while ERL!=2.\n");
2214 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2215 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2219 if (conn->cid == cmd->logout_cid) {
2220 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2221 " with CID: %hu on CID: %hu, implementation error.\n",
2222 cmd->logout_cid, conn->cid);
2223 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2224 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2228 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2237 int cmdsn_ret, logout_remove = 0;
2239 struct iscsi_logout *hdr;
2240 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2242 hdr = (struct iscsi_logout *) buf;
2243 reason_code = (hdr->flags & 0x7f);
2246 spin_lock(&tiqn->logout_stats.lock);
2247 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2248 tiqn->logout_stats.normal_logouts++;
2250 tiqn->logout_stats.abnormal_logouts++;
2251 spin_unlock(&tiqn->logout_stats.lock);
2254 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2255 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2256 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2257 hdr->cid, conn->cid);
2259 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2260 pr_err("Received logout request on connection that"
2261 " is not in logged in state, ignoring request.\n");
2262 iscsit_free_cmd(cmd, false);
2266 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2267 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2268 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2269 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2270 cmd->targ_xfer_tag = 0xFFFFFFFF;
2271 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2272 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2273 cmd->logout_cid = be16_to_cpu(hdr->cid);
2274 cmd->logout_reason = reason_code;
2275 cmd->data_direction = DMA_NONE;
2278 * We need to sleep in these cases (by returning 1) until the Logout
2279 * Response gets sent in the tx thread.
2281 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2282 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2283 be16_to_cpu(hdr->cid) == conn->cid))
2286 spin_lock_bh(&conn->cmd_lock);
2287 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2288 spin_unlock_bh(&conn->cmd_lock);
2290 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2291 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2294 * Immediate commands are executed, well, immediately.
2295 * Non-Immediate Logout Commands are executed in CmdSN order.
2297 if (cmd->immediate_cmd) {
2298 int ret = iscsit_execute_cmd(cmd, 0);
2303 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2304 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2306 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2310 return logout_remove;
2312 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2314 static int iscsit_handle_snack(
2315 struct iscsi_conn *conn,
2318 struct iscsi_snack *hdr;
2320 hdr = (struct iscsi_snack *) buf;
2321 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2323 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2324 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2325 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2326 hdr->begrun, hdr->runlength, conn->cid);
2328 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2329 pr_err("Initiator sent SNACK request while in"
2330 " ErrorRecoveryLevel=0.\n");
2331 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2335 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2336 * call from inside iscsi_send_recovery_datain_or_r2t().
2338 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2340 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2342 be32_to_cpu(hdr->ttt),
2343 be32_to_cpu(hdr->begrun),
2344 be32_to_cpu(hdr->runlength));
2345 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2346 return iscsit_handle_status_snack(conn, hdr->itt,
2347 be32_to_cpu(hdr->ttt),
2348 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2349 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2350 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2351 be32_to_cpu(hdr->begrun),
2352 be32_to_cpu(hdr->runlength));
2353 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2354 /* FIXME: Support R-Data SNACK */
2355 pr_err("R-Data SNACK Not Supported.\n");
2356 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2359 pr_err("Unknown SNACK type 0x%02x, protocol"
2360 " error.\n", hdr->flags & 0x0f);
2361 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2368 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2370 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2371 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2372 wait_for_completion_interruptible_timeout(
2373 &conn->rx_half_close_comp,
2374 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2378 static int iscsit_handle_immediate_data(
2379 struct iscsi_cmd *cmd,
2380 struct iscsi_scsi_req *hdr,
2383 int iov_ret, rx_got = 0, rx_size = 0;
2384 u32 checksum, iov_count = 0, padding = 0;
2385 struct iscsi_conn *conn = cmd->conn;
2388 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2390 return IMMEDIATE_DATA_CANNOT_RECOVER;
2393 iov_count = iov_ret;
2394 iov = &cmd->iov_data[0];
2396 padding = ((-length) & 3);
2398 iov[iov_count].iov_base = cmd->pad_bytes;
2399 iov[iov_count++].iov_len = padding;
2403 if (conn->conn_ops->DataDigest) {
2404 iov[iov_count].iov_base = &checksum;
2405 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2406 rx_size += ISCSI_CRC_LEN;
2409 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2411 iscsit_unmap_iovec(cmd);
2413 if (rx_got != rx_size) {
2414 iscsit_rx_thread_wait_for_tcp(conn);
2415 return IMMEDIATE_DATA_CANNOT_RECOVER;
2418 if (conn->conn_ops->DataDigest) {
2421 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2422 cmd->write_data_done, length, padding,
2425 if (checksum != data_crc) {
2426 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2427 " does not match computed 0x%08x\n", checksum,
2430 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2431 pr_err("Unable to recover from"
2432 " Immediate Data digest failure while"
2434 iscsit_reject_cmd(cmd,
2435 ISCSI_REASON_DATA_DIGEST_ERROR,
2436 (unsigned char *)hdr);
2437 return IMMEDIATE_DATA_CANNOT_RECOVER;
2439 iscsit_reject_cmd(cmd,
2440 ISCSI_REASON_DATA_DIGEST_ERROR,
2441 (unsigned char *)hdr);
2442 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2445 pr_debug("Got CRC32C DataDigest 0x%08x for"
2446 " %u bytes of Immediate Data\n", checksum,
2451 cmd->write_data_done += length;
2453 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2454 spin_lock_bh(&cmd->istate_lock);
2455 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2456 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2457 spin_unlock_bh(&cmd->istate_lock);
2460 return IMMEDIATE_DATA_NORMAL_OPERATION;
2464 * Called with sess->conn_lock held.
2466 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2467 with active network interface */
2468 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2470 struct iscsi_cmd *cmd;
2471 struct iscsi_conn *conn_p;
2474 * Only send a Asynchronous Message on connections whos network
2475 * interface is still functional.
2477 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2478 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2479 iscsit_inc_conn_usage_count(conn_p);
2487 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2489 iscsit_dec_conn_usage_count(conn_p);
2493 cmd->logout_cid = conn->cid;
2494 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2495 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2497 spin_lock_bh(&conn_p->cmd_lock);
2498 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2499 spin_unlock_bh(&conn_p->cmd_lock);
2501 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2502 iscsit_dec_conn_usage_count(conn_p);
2505 static int iscsit_send_conn_drop_async_message(
2506 struct iscsi_cmd *cmd,
2507 struct iscsi_conn *conn)
2509 struct iscsi_async *hdr;
2511 cmd->tx_size = ISCSI_HDR_LEN;
2512 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2514 hdr = (struct iscsi_async *) cmd->pdu;
2515 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2516 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2517 cmd->init_task_tag = RESERVED_ITT;
2518 cmd->targ_xfer_tag = 0xFFFFFFFF;
2519 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2520 cmd->stat_sn = conn->stat_sn++;
2521 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2522 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2523 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2524 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2525 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2526 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2527 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2529 if (conn->conn_ops->HeaderDigest) {
2530 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2532 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2533 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2535 cmd->tx_size += ISCSI_CRC_LEN;
2536 pr_debug("Attaching CRC32C HeaderDigest to"
2537 " Async Message 0x%08x\n", *header_digest);
2540 cmd->iov_misc[0].iov_base = cmd->pdu;
2541 cmd->iov_misc[0].iov_len = cmd->tx_size;
2542 cmd->iov_misc_count = 1;
2544 pr_debug("Sending Connection Dropped Async Message StatSN:"
2545 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2546 cmd->logout_cid, conn->cid);
2550 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2552 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2553 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2554 wait_for_completion_interruptible_timeout(
2555 &conn->tx_half_close_comp,
2556 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2561 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2562 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2565 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2566 hdr->flags = datain->flags;
2567 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2568 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2569 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2570 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2571 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2572 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2573 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2576 hton24(hdr->dlength, datain->length);
2577 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2578 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2579 (struct scsi_lun *)&hdr->lun);
2581 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2583 hdr->itt = cmd->init_task_tag;
2585 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2586 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2588 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2590 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2592 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2594 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2595 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2596 hdr->datasn = cpu_to_be32(datain->data_sn);
2597 hdr->offset = cpu_to_be32(datain->offset);
2599 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2600 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2601 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2602 ntohl(hdr->offset), datain->length, conn->cid);
2605 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2607 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2608 struct iscsi_datain datain;
2609 struct iscsi_datain_req *dr;
2611 u32 iov_count = 0, tx_size = 0;
2612 int eodr = 0, ret, iov_ret;
2613 bool set_statsn = false;
2615 memset(&datain, 0, sizeof(struct iscsi_datain));
2616 dr = iscsit_get_datain_values(cmd, &datain);
2618 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2619 cmd->init_task_tag);
2623 * Be paranoid and double check the logic for now.
2625 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2626 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2627 " datain.length: %u exceeds cmd->data_length: %u\n",
2628 cmd->init_task_tag, datain.offset, datain.length,
2629 cmd->se_cmd.data_length);
2633 spin_lock_bh(&conn->sess->session_stats_lock);
2634 conn->sess->tx_data_octets += datain.length;
2635 if (conn->sess->se_sess->se_node_acl) {
2636 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2637 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2638 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2640 spin_unlock_bh(&conn->sess->session_stats_lock);
2642 * Special case for successfully execution w/ both DATAIN
2645 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2646 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2647 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2649 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2650 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2651 iscsit_increment_maxcmdsn(cmd, conn->sess);
2652 cmd->stat_sn = conn->stat_sn++;
2654 } else if (dr->dr_complete ==
2655 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2659 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2661 iov = &cmd->iov_data[0];
2662 iov[iov_count].iov_base = cmd->pdu;
2663 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2664 tx_size += ISCSI_HDR_LEN;
2666 if (conn->conn_ops->HeaderDigest) {
2667 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2669 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2670 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2672 iov[0].iov_len += ISCSI_CRC_LEN;
2673 tx_size += ISCSI_CRC_LEN;
2675 pr_debug("Attaching CRC32 HeaderDigest"
2676 " for DataIN PDU 0x%08x\n", *header_digest);
2679 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2680 datain.offset, datain.length);
2684 iov_count += iov_ret;
2685 tx_size += datain.length;
2687 cmd->padding = ((-datain.length) & 3);
2689 iov[iov_count].iov_base = cmd->pad_bytes;
2690 iov[iov_count++].iov_len = cmd->padding;
2691 tx_size += cmd->padding;
2693 pr_debug("Attaching %u padding bytes\n",
2696 if (conn->conn_ops->DataDigest) {
2697 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2698 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2700 iov[iov_count].iov_base = &cmd->data_crc;
2701 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2702 tx_size += ISCSI_CRC_LEN;
2704 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2705 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2708 cmd->iov_data_count = iov_count;
2709 cmd->tx_size = tx_size;
2711 /* sendpage is preferred but can't insert markers */
2712 if (!conn->conn_ops->IFMarker)
2713 ret = iscsit_fe_sendpage_sg(cmd, conn);
2715 ret = iscsit_send_tx_data(cmd, conn, 0);
2717 iscsit_unmap_iovec(cmd);
2720 iscsit_tx_thread_wait_for_tcp(conn);
2724 if (dr->dr_complete) {
2725 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2727 iscsit_free_datain_req(cmd, dr);
2734 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2735 struct iscsi_logout_rsp *hdr)
2737 struct iscsi_conn *logout_conn = NULL;
2738 struct iscsi_conn_recovery *cr = NULL;
2739 struct iscsi_session *sess = conn->sess;
2741 * The actual shutting down of Sessions and/or Connections
2742 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2743 * is done in scsi_logout_post_handler().
2745 switch (cmd->logout_reason) {
2746 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2747 pr_debug("iSCSI session logout successful, setting"
2748 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2749 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2751 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2752 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2755 * For CLOSECONNECTION logout requests carrying
2756 * a matching logout CID -> local CID, the reference
2757 * for the local CID will have been incremented in
2758 * iscsi_logout_closeconnection().
2760 * For CLOSECONNECTION logout requests carrying
2761 * a different CID than the connection it arrived
2762 * on, the connection responding to cmd->logout_cid
2763 * is stopped in iscsit_logout_post_handler_diffcid().
2766 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2767 " successful.\n", cmd->logout_cid, conn->cid);
2768 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2770 case ISCSI_LOGOUT_REASON_RECOVERY:
2771 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2772 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2775 * If the connection is still active from our point of view
2776 * force connection recovery to occur.
2778 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2781 iscsit_connection_reinstatement_rcfr(logout_conn);
2782 iscsit_dec_conn_usage_count(logout_conn);
2785 cr = iscsit_get_inactive_connection_recovery_entry(
2786 conn->sess, cmd->logout_cid);
2788 pr_err("Unable to locate CID: %hu for"
2789 " REMOVECONNFORRECOVERY Logout Request.\n",
2791 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2795 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2797 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2798 " for recovery for CID: %hu on CID: %hu successful.\n",
2799 cmd->logout_cid, conn->cid);
2800 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2803 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2804 cmd->logout_reason);
2808 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2809 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2810 hdr->response = cmd->logout_response;
2811 hdr->itt = cmd->init_task_tag;
2812 cmd->stat_sn = conn->stat_sn++;
2813 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2815 iscsit_increment_maxcmdsn(cmd, conn->sess);
2816 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2817 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2819 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2820 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2821 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2822 cmd->logout_cid, conn->cid);
2826 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2829 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2832 int niov = 0, tx_size, rc;
2834 rc = iscsit_build_logout_rsp(cmd, conn,
2835 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2839 tx_size = ISCSI_HDR_LEN;
2840 iov = &cmd->iov_misc[0];
2841 iov[niov].iov_base = cmd->pdu;
2842 iov[niov++].iov_len = ISCSI_HDR_LEN;
2844 if (conn->conn_ops->HeaderDigest) {
2845 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2847 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2848 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2850 iov[0].iov_len += ISCSI_CRC_LEN;
2851 tx_size += ISCSI_CRC_LEN;
2852 pr_debug("Attaching CRC32C HeaderDigest to"
2853 " Logout Response 0x%08x\n", *header_digest);
2855 cmd->iov_misc_count = niov;
2856 cmd->tx_size = tx_size;
2862 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2863 struct iscsi_nopin *hdr, bool nopout_response)
2865 hdr->opcode = ISCSI_OP_NOOP_IN;
2866 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2867 hton24(hdr->dlength, cmd->buf_ptr_size);
2868 if (nopout_response)
2869 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2870 hdr->itt = cmd->init_task_tag;
2871 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2872 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2874 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2876 if (nopout_response)
2877 iscsit_increment_maxcmdsn(cmd, conn->sess);
2879 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2880 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2882 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2883 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2884 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2885 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2887 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2890 * Unsolicited NOPIN, either requesting a response or not.
2892 static int iscsit_send_unsolicited_nopin(
2893 struct iscsi_cmd *cmd,
2894 struct iscsi_conn *conn,
2897 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2898 int tx_size = ISCSI_HDR_LEN, ret;
2900 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2902 if (conn->conn_ops->HeaderDigest) {
2903 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2905 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2906 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2908 tx_size += ISCSI_CRC_LEN;
2909 pr_debug("Attaching CRC32C HeaderDigest to"
2910 " NopIN 0x%08x\n", *header_digest);
2913 cmd->iov_misc[0].iov_base = cmd->pdu;
2914 cmd->iov_misc[0].iov_len = tx_size;
2915 cmd->iov_misc_count = 1;
2916 cmd->tx_size = tx_size;
2918 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2919 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2921 ret = iscsit_send_tx_data(cmd, conn, 1);
2923 iscsit_tx_thread_wait_for_tcp(conn);
2927 spin_lock_bh(&cmd->istate_lock);
2928 cmd->i_state = want_response ?
2929 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2930 spin_unlock_bh(&cmd->istate_lock);
2936 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2938 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2941 int niov = 0, tx_size;
2943 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2945 tx_size = ISCSI_HDR_LEN;
2946 iov = &cmd->iov_misc[0];
2947 iov[niov].iov_base = cmd->pdu;
2948 iov[niov++].iov_len = ISCSI_HDR_LEN;
2950 if (conn->conn_ops->HeaderDigest) {
2951 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2953 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2954 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2956 iov[0].iov_len += ISCSI_CRC_LEN;
2957 tx_size += ISCSI_CRC_LEN;
2958 pr_debug("Attaching CRC32C HeaderDigest"
2959 " to NopIn 0x%08x\n", *header_digest);
2963 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2964 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2966 if (cmd->buf_ptr_size) {
2967 iov[niov].iov_base = cmd->buf_ptr;
2968 iov[niov++].iov_len = cmd->buf_ptr_size;
2969 tx_size += cmd->buf_ptr_size;
2971 pr_debug("Echoing back %u bytes of ping"
2972 " data.\n", cmd->buf_ptr_size);
2974 padding = ((-cmd->buf_ptr_size) & 3);
2976 iov[niov].iov_base = &cmd->pad_bytes;
2977 iov[niov++].iov_len = padding;
2979 pr_debug("Attaching %u additional"
2980 " padding bytes.\n", padding);
2982 if (conn->conn_ops->DataDigest) {
2983 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2984 cmd->buf_ptr, cmd->buf_ptr_size,
2985 padding, (u8 *)&cmd->pad_bytes,
2986 (u8 *)&cmd->data_crc);
2988 iov[niov].iov_base = &cmd->data_crc;
2989 iov[niov++].iov_len = ISCSI_CRC_LEN;
2990 tx_size += ISCSI_CRC_LEN;
2991 pr_debug("Attached DataDigest for %u"
2992 " bytes of ping data, CRC 0x%08x\n",
2993 cmd->buf_ptr_size, cmd->data_crc);
2997 cmd->iov_misc_count = niov;
2998 cmd->tx_size = tx_size;
3003 static int iscsit_send_r2t(
3004 struct iscsi_cmd *cmd,
3005 struct iscsi_conn *conn)
3008 struct iscsi_r2t *r2t;
3009 struct iscsi_r2t_rsp *hdr;
3012 r2t = iscsit_get_r2t_from_list(cmd);
3016 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3017 memset(hdr, 0, ISCSI_HDR_LEN);
3018 hdr->opcode = ISCSI_OP_R2T;
3019 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3020 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3021 (struct scsi_lun *)&hdr->lun);
3022 hdr->itt = cmd->init_task_tag;
3023 spin_lock_bh(&conn->sess->ttt_lock);
3024 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3025 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3026 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3027 spin_unlock_bh(&conn->sess->ttt_lock);
3028 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3029 hdr->statsn = cpu_to_be32(conn->stat_sn);
3030 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3031 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3032 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3033 hdr->data_offset = cpu_to_be32(r2t->offset);
3034 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3036 cmd->iov_misc[0].iov_base = cmd->pdu;
3037 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3038 tx_size += ISCSI_HDR_LEN;
3040 if (conn->conn_ops->HeaderDigest) {
3041 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3043 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3044 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3046 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3047 tx_size += ISCSI_CRC_LEN;
3048 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3049 " PDU 0x%08x\n", *header_digest);
3052 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3053 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3054 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3055 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3056 r2t->offset, r2t->xfer_len, conn->cid);
3058 cmd->iov_misc_count = 1;
3059 cmd->tx_size = tx_size;
3061 spin_lock_bh(&cmd->r2t_lock);
3063 spin_unlock_bh(&cmd->r2t_lock);
3065 ret = iscsit_send_tx_data(cmd, conn, 1);
3067 iscsit_tx_thread_wait_for_tcp(conn);
3071 spin_lock_bh(&cmd->dataout_timeout_lock);
3072 iscsit_start_dataout_timer(cmd, conn);
3073 spin_unlock_bh(&cmd->dataout_timeout_lock);
3079 * @recovery: If called from iscsi_task_reassign_complete_write() for
3080 * connection recovery.
3082 int iscsit_build_r2ts_for_cmd(
3083 struct iscsi_conn *conn,
3084 struct iscsi_cmd *cmd,
3088 u32 offset = 0, xfer_len = 0;
3090 spin_lock_bh(&cmd->r2t_lock);
3091 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3092 spin_unlock_bh(&cmd->r2t_lock);
3096 if (conn->sess->sess_ops->DataSequenceInOrder &&
3098 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3100 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3101 if (conn->sess->sess_ops->DataSequenceInOrder) {
3102 offset = cmd->r2t_offset;
3104 if (first_r2t && recovery) {
3105 int new_data_end = offset +
3106 conn->sess->sess_ops->MaxBurstLength -
3107 cmd->next_burst_len;
3109 if (new_data_end > cmd->se_cmd.data_length)
3110 xfer_len = cmd->se_cmd.data_length - offset;
3113 conn->sess->sess_ops->MaxBurstLength -
3114 cmd->next_burst_len;
3116 int new_data_end = offset +
3117 conn->sess->sess_ops->MaxBurstLength;
3119 if (new_data_end > cmd->se_cmd.data_length)
3120 xfer_len = cmd->se_cmd.data_length - offset;
3122 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3124 cmd->r2t_offset += xfer_len;
3126 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3127 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3129 struct iscsi_seq *seq;
3131 seq = iscsit_get_seq_holder_for_r2t(cmd);
3133 spin_unlock_bh(&cmd->r2t_lock);
3137 offset = seq->offset;
3138 xfer_len = seq->xfer_len;
3140 if (cmd->seq_send_order == cmd->seq_count)
3141 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143 cmd->outstanding_r2ts++;
3146 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3147 spin_unlock_bh(&cmd->r2t_lock);
3151 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3154 spin_unlock_bh(&cmd->r2t_lock);
3159 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3160 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3163 cmd->stat_sn = conn->stat_sn++;
3165 spin_lock_bh(&conn->sess->session_stats_lock);
3166 conn->sess->rsp_pdus++;
3167 spin_unlock_bh(&conn->sess->session_stats_lock);
3169 memset(hdr, 0, ISCSI_HDR_LEN);
3170 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3171 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3172 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3173 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3174 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3175 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3176 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3177 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3179 hdr->response = cmd->iscsi_response;
3180 hdr->cmd_status = cmd->se_cmd.scsi_status;
3181 hdr->itt = cmd->init_task_tag;
3182 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3184 iscsit_increment_maxcmdsn(cmd, conn->sess);
3185 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3186 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3188 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3189 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3190 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3191 cmd->se_cmd.scsi_status, conn->cid);
3193 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3195 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3197 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3199 u32 padding = 0, tx_size = 0;
3201 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3203 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3205 iov = &cmd->iov_misc[0];
3206 iov[iov_count].iov_base = cmd->pdu;
3207 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3208 tx_size += ISCSI_HDR_LEN;
3211 * Attach SENSE DATA payload to iSCSI Response PDU
3213 if (cmd->se_cmd.sense_buffer &&
3214 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3215 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3216 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3217 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3219 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3220 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3221 iov[iov_count].iov_base = cmd->sense_buffer;
3222 iov[iov_count++].iov_len =
3223 (cmd->se_cmd.scsi_sense_length + padding);
3224 tx_size += cmd->se_cmd.scsi_sense_length;
3227 memset(cmd->sense_buffer +
3228 cmd->se_cmd.scsi_sense_length, 0, padding);
3230 pr_debug("Adding %u bytes of padding to"
3231 " SENSE.\n", padding);
3234 if (conn->conn_ops->DataDigest) {
3235 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3237 (cmd->se_cmd.scsi_sense_length + padding),
3238 0, NULL, (u8 *)&cmd->data_crc);
3240 iov[iov_count].iov_base = &cmd->data_crc;
3241 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3242 tx_size += ISCSI_CRC_LEN;
3244 pr_debug("Attaching CRC32 DataDigest for"
3245 " SENSE, %u bytes CRC 0x%08x\n",
3246 (cmd->se_cmd.scsi_sense_length + padding),
3250 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3252 cmd->se_cmd.scsi_sense_length);
3255 if (conn->conn_ops->HeaderDigest) {
3256 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3258 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3259 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3261 iov[0].iov_len += ISCSI_CRC_LEN;
3262 tx_size += ISCSI_CRC_LEN;
3263 pr_debug("Attaching CRC32 HeaderDigest for Response"
3264 " PDU 0x%08x\n", *header_digest);
3267 cmd->iov_misc_count = iov_count;
3268 cmd->tx_size = tx_size;
3273 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3275 switch (se_tmr->response) {
3276 case TMR_FUNCTION_COMPLETE:
3277 return ISCSI_TMF_RSP_COMPLETE;
3278 case TMR_TASK_DOES_NOT_EXIST:
3279 return ISCSI_TMF_RSP_NO_TASK;
3280 case TMR_LUN_DOES_NOT_EXIST:
3281 return ISCSI_TMF_RSP_NO_LUN;
3282 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3283 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3284 case TMR_FUNCTION_REJECTED:
3286 return ISCSI_TMF_RSP_REJECTED;
3291 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3292 struct iscsi_tm_rsp *hdr)
3294 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3296 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3297 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3298 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3299 hdr->itt = cmd->init_task_tag;
3300 cmd->stat_sn = conn->stat_sn++;
3301 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3303 iscsit_increment_maxcmdsn(cmd, conn->sess);
3304 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3305 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3307 pr_debug("Built Task Management Response ITT: 0x%08x,"
3308 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3309 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3311 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3314 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3316 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3319 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3321 cmd->iov_misc[0].iov_base = cmd->pdu;
3322 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3323 tx_size += ISCSI_HDR_LEN;
3325 if (conn->conn_ops->HeaderDigest) {
3326 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3328 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3329 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3331 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3332 tx_size += ISCSI_CRC_LEN;
3333 pr_debug("Attaching CRC32 HeaderDigest for Task"
3334 " Mgmt Response PDU 0x%08x\n", *header_digest);
3337 cmd->iov_misc_count = 1;
3338 cmd->tx_size = tx_size;
3343 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3347 if (np->np_sockaddr.ss_family == AF_INET6) {
3348 const struct sockaddr_in6 sin6 = {
3349 .sin6_addr = IN6ADDR_ANY_INIT };
3350 struct sockaddr_in6 *sock_in6 =
3351 (struct sockaddr_in6 *)&np->np_sockaddr;
3353 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3354 sin6.sin6_addr.s6_addr, 16))
3357 struct sockaddr_in * sock_in =
3358 (struct sockaddr_in *)&np->np_sockaddr;
3360 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3367 #define SENDTARGETS_BUF_LIMIT 32768U
3369 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3371 char *payload = NULL;
3372 struct iscsi_conn *conn = cmd->conn;
3373 struct iscsi_portal_group *tpg;
3374 struct iscsi_tiqn *tiqn;
3375 struct iscsi_tpg_np *tpg_np;
3376 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3377 int target_name_printed;
3378 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3379 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3381 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3382 SENDTARGETS_BUF_LIMIT);
3384 payload = kzalloc(buffer_len, GFP_KERNEL);
3386 pr_err("Unable to allocate memory for sendtargets"
3391 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3394 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3395 text_ptr = strchr(text_in, '=');
3397 pr_err("Unable to locate '=' string in text_in:"
3403 * Skip over '=' character..
3408 spin_lock(&tiqn_lock);
3409 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3410 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3411 strcmp(tiqn->tiqn, text_ptr)) {
3415 target_name_printed = 0;
3417 spin_lock(&tiqn->tiqn_tpg_lock);
3418 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3420 /* If demo_mode_discovery=0 and generate_node_acls=0
3421 * (demo mode dislabed) do not return
3422 * TargetName+TargetAddress unless a NodeACL exists.
3425 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3426 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3427 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3428 cmd->conn->sess->sess_ops->InitiatorName))) {
3432 spin_lock(&tpg->tpg_state_lock);
3433 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3434 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3435 spin_unlock(&tpg->tpg_state_lock);
3438 spin_unlock(&tpg->tpg_state_lock);
3440 spin_lock(&tpg->tpg_np_lock);
3441 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3443 struct iscsi_np *np = tpg_np->tpg_np;
3444 bool inaddr_any = iscsit_check_inaddr_any(np);
3446 if (!target_name_printed) {
3447 len = sprintf(buf, "TargetName=%s",
3451 if ((len + payload_len) > buffer_len) {
3452 spin_unlock(&tpg->tpg_np_lock);
3453 spin_unlock(&tiqn->tiqn_tpg_lock);
3457 memcpy(payload + payload_len, buf, len);
3459 target_name_printed = 1;
3462 len = sprintf(buf, "TargetAddress="
3464 (inaddr_any == false) ?
3465 np->np_ip : conn->local_ip,
3466 (inaddr_any == false) ?
3467 np->np_port : conn->local_port,
3471 if ((len + payload_len) > buffer_len) {
3472 spin_unlock(&tpg->tpg_np_lock);
3473 spin_unlock(&tiqn->tiqn_tpg_lock);
3477 memcpy(payload + payload_len, buf, len);
3480 spin_unlock(&tpg->tpg_np_lock);
3482 spin_unlock(&tiqn->tiqn_tpg_lock);
3487 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3490 spin_unlock(&tiqn_lock);
3492 cmd->buf_ptr = payload;
3498 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3499 struct iscsi_text_rsp *hdr)
3501 int text_length, padding;
3503 text_length = iscsit_build_sendtargets_response(cmd);
3504 if (text_length < 0)
3507 hdr->opcode = ISCSI_OP_TEXT_RSP;
3508 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3509 padding = ((-text_length) & 3);
3510 hton24(hdr->dlength, text_length);
3511 hdr->itt = cmd->init_task_tag;
3512 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3513 cmd->stat_sn = conn->stat_sn++;
3514 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3516 iscsit_increment_maxcmdsn(cmd, conn->sess);
3517 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3518 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3520 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3521 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3522 text_length, conn->cid);
3524 return text_length + padding;
3526 EXPORT_SYMBOL(iscsit_build_text_rsp);
3529 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3530 * MaxRecvDataSegmentLength.
3532 static int iscsit_send_text_rsp(
3533 struct iscsi_cmd *cmd,
3534 struct iscsi_conn *conn)
3536 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3539 int text_length, iov_count = 0, rc;
3541 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3546 iov = &cmd->iov_misc[0];
3547 iov[iov_count].iov_base = cmd->pdu;
3548 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3549 iov[iov_count].iov_base = cmd->buf_ptr;
3550 iov[iov_count++].iov_len = text_length;
3552 tx_size += (ISCSI_HDR_LEN + text_length);
3554 if (conn->conn_ops->HeaderDigest) {
3555 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3557 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3558 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3560 iov[0].iov_len += ISCSI_CRC_LEN;
3561 tx_size += ISCSI_CRC_LEN;
3562 pr_debug("Attaching CRC32 HeaderDigest for"
3563 " Text Response PDU 0x%08x\n", *header_digest);
3566 if (conn->conn_ops->DataDigest) {
3567 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3568 cmd->buf_ptr, text_length,
3569 0, NULL, (u8 *)&cmd->data_crc);
3571 iov[iov_count].iov_base = &cmd->data_crc;
3572 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3573 tx_size += ISCSI_CRC_LEN;
3575 pr_debug("Attaching DataDigest for %u bytes of text"
3576 " data, CRC 0x%08x\n", text_length,
3580 cmd->iov_misc_count = iov_count;
3581 cmd->tx_size = tx_size;
3587 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3588 struct iscsi_reject *hdr)
3590 hdr->opcode = ISCSI_OP_REJECT;
3591 hdr->reason = cmd->reject_reason;
3592 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3593 hton24(hdr->dlength, ISCSI_HDR_LEN);
3594 hdr->ffffffff = cpu_to_be32(0xffffffff);
3595 cmd->stat_sn = conn->stat_sn++;
3596 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3597 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3598 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3601 EXPORT_SYMBOL(iscsit_build_reject);
3603 static int iscsit_send_reject(
3604 struct iscsi_cmd *cmd,
3605 struct iscsi_conn *conn)
3607 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3609 u32 iov_count = 0, tx_size;
3611 iscsit_build_reject(cmd, conn, hdr);
3613 iov = &cmd->iov_misc[0];
3614 iov[iov_count].iov_base = cmd->pdu;
3615 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3616 iov[iov_count].iov_base = cmd->buf_ptr;
3617 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3619 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3621 if (conn->conn_ops->HeaderDigest) {
3622 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3624 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3625 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3627 iov[0].iov_len += ISCSI_CRC_LEN;
3628 tx_size += ISCSI_CRC_LEN;
3629 pr_debug("Attaching CRC32 HeaderDigest for"
3630 " REJECT PDU 0x%08x\n", *header_digest);
3633 if (conn->conn_ops->DataDigest) {
3634 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3635 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3637 iov[iov_count].iov_base = &cmd->data_crc;
3638 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3639 tx_size += ISCSI_CRC_LEN;
3640 pr_debug("Attaching CRC32 DataDigest for REJECT"
3641 " PDU 0x%08x\n", cmd->data_crc);
3644 cmd->iov_misc_count = iov_count;
3645 cmd->tx_size = tx_size;
3647 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3648 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3653 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3655 struct iscsi_thread_set *ts = conn->thread_set;
3658 * thread_id is assigned from iscsit_global->ts_bitmap from
3659 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3661 * Here we use thread_id to determine which CPU that this
3662 * iSCSI connection's iscsi_thread_set will be scheduled to
3665 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3666 for_each_online_cpu(cpu) {
3668 cpumask_set_cpu(cpu, conn->conn_cpumask);
3673 * This should never be reached..
3676 cpumask_setall(conn->conn_cpumask);
3679 static inline void iscsit_thread_check_cpumask(
3680 struct iscsi_conn *conn,
3681 struct task_struct *p,
3686 * mode == 1 signals iscsi_target_tx_thread() usage.
3687 * mode == 0 signals iscsi_target_rx_thread() usage.
3690 if (!conn->conn_tx_reset_cpumask)
3692 conn->conn_tx_reset_cpumask = 0;
3694 if (!conn->conn_rx_reset_cpumask)
3696 conn->conn_rx_reset_cpumask = 0;
3699 * Update the CPU mask for this single kthread so that
3700 * both TX and RX kthreads are scheduled to run on the
3703 memset(buf, 0, 128);
3704 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3705 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3709 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3714 case ISTATE_SEND_R2T:
3715 ret = iscsit_send_r2t(cmd, conn);
3720 spin_lock_bh(&conn->cmd_lock);
3721 list_del(&cmd->i_conn_node);
3722 spin_unlock_bh(&conn->cmd_lock);
3724 iscsit_free_cmd(cmd, false);
3726 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3727 iscsit_mod_nopin_response_timer(conn);
3728 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3732 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3733 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3738 pr_err("Unknown Opcode: 0x%02x ITT:"
3739 " 0x%08x, i_state: %d on CID: %hu\n",
3740 cmd->iscsi_opcode, cmd->init_task_tag, state,
3752 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3754 struct iscsit_transport *t = conn->conn_transport;
3755 struct iscsi_queue_req *qr;
3756 struct iscsi_cmd *cmd;
3760 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3761 atomic_set(&conn->check_immediate_queue, 0);
3764 kmem_cache_free(lio_qr_cache, qr);
3766 ret = t->iscsit_immediate_queue(conn, cmd, state);
3775 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3781 case ISTATE_SEND_DATAIN:
3782 ret = iscsit_send_datain(cmd, conn);
3787 goto check_rsp_state;
3788 else if (ret == 1) {
3790 spin_lock_bh(&cmd->istate_lock);
3791 cmd->i_state = ISTATE_SENT_STATUS;
3792 spin_unlock_bh(&cmd->istate_lock);
3794 if (atomic_read(&conn->check_immediate_queue))
3798 } else if (ret == 2) {
3799 /* Still must send status,
3800 SCF_TRANSPORT_TASK_SENSE was set */
3801 spin_lock_bh(&cmd->istate_lock);
3802 cmd->i_state = ISTATE_SEND_STATUS;
3803 spin_unlock_bh(&cmd->istate_lock);
3804 state = ISTATE_SEND_STATUS;
3805 goto check_rsp_state;
3809 case ISTATE_SEND_STATUS:
3810 case ISTATE_SEND_STATUS_RECOVERY:
3811 ret = iscsit_send_response(cmd, conn);
3813 case ISTATE_SEND_LOGOUTRSP:
3814 ret = iscsit_send_logout(cmd, conn);
3816 case ISTATE_SEND_ASYNCMSG:
3817 ret = iscsit_send_conn_drop_async_message(
3820 case ISTATE_SEND_NOPIN:
3821 ret = iscsit_send_nopin(cmd, conn);
3823 case ISTATE_SEND_REJECT:
3824 ret = iscsit_send_reject(cmd, conn);
3826 case ISTATE_SEND_TASKMGTRSP:
3827 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3830 ret = iscsit_tmr_post_handler(cmd, conn);
3832 iscsit_fall_back_to_erl0(conn->sess);
3834 case ISTATE_SEND_TEXTRSP:
3835 ret = iscsit_send_text_rsp(cmd, conn);
3838 pr_err("Unknown Opcode: 0x%02x ITT:"
3839 " 0x%08x, i_state: %d on CID: %hu\n",
3840 cmd->iscsi_opcode, cmd->init_task_tag,
3847 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3848 iscsit_tx_thread_wait_for_tcp(conn);
3849 iscsit_unmap_iovec(cmd);
3852 iscsit_unmap_iovec(cmd);
3855 case ISTATE_SEND_LOGOUTRSP:
3856 if (!iscsit_logout_post_handler(cmd, conn))
3859 case ISTATE_SEND_STATUS:
3860 case ISTATE_SEND_ASYNCMSG:
3861 case ISTATE_SEND_NOPIN:
3862 case ISTATE_SEND_STATUS_RECOVERY:
3863 case ISTATE_SEND_TEXTRSP:
3864 case ISTATE_SEND_TASKMGTRSP:
3865 case ISTATE_SEND_REJECT:
3866 spin_lock_bh(&cmd->istate_lock);
3867 cmd->i_state = ISTATE_SENT_STATUS;
3868 spin_unlock_bh(&cmd->istate_lock);
3871 pr_err("Unknown Opcode: 0x%02x ITT:"
3872 " 0x%08x, i_state: %d on CID: %hu\n",
3873 cmd->iscsi_opcode, cmd->init_task_tag,
3874 cmd->i_state, conn->cid);
3878 if (atomic_read(&conn->check_immediate_queue))
3889 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3891 struct iscsit_transport *t = conn->conn_transport;
3892 struct iscsi_queue_req *qr;
3893 struct iscsi_cmd *cmd;
3897 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3900 kmem_cache_free(lio_qr_cache, qr);
3902 ret = t->iscsit_response_queue(conn, cmd, state);
3903 if (ret == 1 || ret < 0)
3910 int iscsi_target_tx_thread(void *arg)
3913 struct iscsi_conn *conn;
3914 struct iscsi_thread_set *ts = arg;
3916 * Allow ourselves to be interrupted by SIGINT so that a
3917 * connection recovery / failure event can be triggered externally.
3919 allow_signal(SIGINT);
3922 conn = iscsi_tx_thread_pre_handler(ts);
3928 while (!kthread_should_stop()) {
3930 * Ensure that both TX and RX per connection kthreads
3931 * are scheduled to run on the same CPU.
3933 iscsit_thread_check_cpumask(conn, current, 1);
3935 wait_event_interruptible(conn->queues_wq,
3936 !iscsit_conn_all_queues_empty(conn) ||
3937 ts->status == ISCSI_THREAD_SET_RESET);
3939 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3940 signal_pending(current))
3944 ret = iscsit_handle_immediate_queue(conn);
3948 ret = iscsit_handle_response_queue(conn);
3951 else if (ret == -EAGAIN)
3958 iscsit_take_action_for_connection_exit(conn);
3964 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3966 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3967 struct iscsi_cmd *cmd;
3970 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3971 case ISCSI_OP_SCSI_CMD:
3972 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3976 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3978 case ISCSI_OP_SCSI_DATA_OUT:
3979 ret = iscsit_handle_data_out(conn, buf);
3981 case ISCSI_OP_NOOP_OUT:
3983 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3984 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3988 ret = iscsit_handle_nop_out(conn, cmd, buf);
3990 case ISCSI_OP_SCSI_TMFUNC:
3991 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3995 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3998 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
4002 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4004 case ISCSI_OP_LOGOUT:
4005 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
4009 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4011 wait_for_completion_timeout(&conn->conn_logout_comp,
4012 SECONDS_FOR_LOGOUT_COMP * HZ);
4014 case ISCSI_OP_SNACK:
4015 ret = iscsit_handle_snack(conn, buf);
4018 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4019 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4020 pr_err("Cannot recover from unknown"
4021 " opcode while ERL=0, closing iSCSI connection.\n");
4024 if (!conn->conn_ops->OFMarker) {
4025 pr_err("Unable to recover from unknown"
4026 " opcode while OFMarker=No, closing iSCSI"
4030 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4031 pr_err("Unable to recover from unknown"
4032 " opcode, closing iSCSI connection.\n");
4040 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4043 int iscsi_target_rx_thread(void *arg)
4046 u8 buffer[ISCSI_HDR_LEN], opcode;
4047 u32 checksum = 0, digest = 0;
4048 struct iscsi_conn *conn = NULL;
4049 struct iscsi_thread_set *ts = arg;
4052 * Allow ourselves to be interrupted by SIGINT so that a
4053 * connection recovery / failure event can be triggered externally.
4055 allow_signal(SIGINT);
4058 conn = iscsi_rx_thread_pre_handler(ts);
4062 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4063 struct completion comp;
4066 init_completion(&comp);
4067 rc = wait_for_completion_interruptible(&comp);
4074 while (!kthread_should_stop()) {
4076 * Ensure that both TX and RX per connection kthreads
4077 * are scheduled to run on the same CPU.
4079 iscsit_thread_check_cpumask(conn, current, 0);
4081 memset(buffer, 0, ISCSI_HDR_LEN);
4082 memset(&iov, 0, sizeof(struct kvec));
4084 iov.iov_base = buffer;
4085 iov.iov_len = ISCSI_HDR_LEN;
4087 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4088 if (ret != ISCSI_HDR_LEN) {
4089 iscsit_rx_thread_wait_for_tcp(conn);
4093 if (conn->conn_ops->HeaderDigest) {
4094 iov.iov_base = &digest;
4095 iov.iov_len = ISCSI_CRC_LEN;
4097 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4098 if (ret != ISCSI_CRC_LEN) {
4099 iscsit_rx_thread_wait_for_tcp(conn);
4103 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4104 buffer, ISCSI_HDR_LEN,
4105 0, NULL, (u8 *)&checksum);
4107 if (digest != checksum) {
4108 pr_err("HeaderDigest CRC32C failed,"
4109 " received 0x%08x, computed 0x%08x\n",
4112 * Set the PDU to 0xff so it will intentionally
4113 * hit default in the switch below.
4115 memset(buffer, 0xff, ISCSI_HDR_LEN);
4116 spin_lock_bh(&conn->sess->session_stats_lock);
4117 conn->sess->conn_digest_errors++;
4118 spin_unlock_bh(&conn->sess->session_stats_lock);
4120 pr_debug("Got HeaderDigest CRC32C"
4121 " 0x%08x\n", checksum);
4125 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4128 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4130 if (conn->sess->sess_ops->SessionType &&
4131 ((!(opcode & ISCSI_OP_TEXT)) ||
4132 (!(opcode & ISCSI_OP_LOGOUT)))) {
4133 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4134 " while in Discovery Session, rejecting.\n", opcode);
4135 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4140 ret = iscsi_target_rx_opcode(conn, buffer);
4146 if (!signal_pending(current))
4147 atomic_set(&conn->transport_failed, 1);
4148 iscsit_take_action_for_connection_exit(conn);
4154 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4156 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4157 struct iscsi_session *sess = conn->sess;
4159 * We expect this function to only ever be called from either RX or TX
4160 * thread context via iscsit_close_connection() once the other context
4161 * has been reset -> returned sleeping pre-handler state.
4163 spin_lock_bh(&conn->cmd_lock);
4164 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4166 list_del(&cmd->i_conn_node);
4167 spin_unlock_bh(&conn->cmd_lock);
4169 iscsit_increment_maxcmdsn(cmd, sess);
4171 iscsit_free_cmd(cmd, true);
4173 spin_lock_bh(&conn->cmd_lock);
4175 spin_unlock_bh(&conn->cmd_lock);
4178 static void iscsit_stop_timers_for_cmds(
4179 struct iscsi_conn *conn)
4181 struct iscsi_cmd *cmd;
4183 spin_lock_bh(&conn->cmd_lock);
4184 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4185 if (cmd->data_direction == DMA_TO_DEVICE)
4186 iscsit_stop_dataout_timer(cmd);
4188 spin_unlock_bh(&conn->cmd_lock);
4191 int iscsit_close_connection(
4192 struct iscsi_conn *conn)
4194 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4195 struct iscsi_session *sess = conn->sess;
4197 pr_debug("Closing iSCSI connection CID %hu on SID:"
4198 " %u\n", conn->cid, sess->sid);
4200 * Always up conn_logout_comp just in case the RX Thread is sleeping
4201 * and the logout response never got sent because the connection
4204 complete(&conn->conn_logout_comp);
4206 iscsi_release_thread_set(conn);
4208 iscsit_stop_timers_for_cmds(conn);
4209 iscsit_stop_nopin_response_timer(conn);
4210 iscsit_stop_nopin_timer(conn);
4211 iscsit_free_queue_reqs_for_conn(conn);
4214 * During Connection recovery drop unacknowledged out of order
4215 * commands for this connection, and prepare the other commands
4218 * During normal operation clear the out of order commands (but
4219 * do not free the struct iscsi_ooo_cmdsn's) and release all
4220 * struct iscsi_cmds.
4222 if (atomic_read(&conn->connection_recovery)) {
4223 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4224 iscsit_prepare_cmds_for_realligance(conn);
4226 iscsit_clear_ooo_cmdsns_for_conn(conn);
4227 iscsit_release_commands_from_conn(conn);
4231 * Handle decrementing session or connection usage count if
4232 * a logout response was not able to be sent because the
4233 * connection failed. Fall back to Session Recovery here.
4235 if (atomic_read(&conn->conn_logout_remove)) {
4236 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4237 iscsit_dec_conn_usage_count(conn);
4238 iscsit_dec_session_usage_count(sess);
4240 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4241 iscsit_dec_conn_usage_count(conn);
4243 atomic_set(&conn->conn_logout_remove, 0);
4244 atomic_set(&sess->session_reinstatement, 0);
4245 atomic_set(&sess->session_fall_back_to_erl0, 1);
4248 spin_lock_bh(&sess->conn_lock);
4249 list_del(&conn->conn_list);
4252 * Attempt to let the Initiator know this connection failed by
4253 * sending an Connection Dropped Async Message on another
4254 * active connection.
4256 if (atomic_read(&conn->connection_recovery))
4257 iscsit_build_conn_drop_async_message(conn);
4259 spin_unlock_bh(&sess->conn_lock);
4262 * If connection reinstatement is being performed on this connection,
4263 * up the connection reinstatement semaphore that is being blocked on
4264 * in iscsit_cause_connection_reinstatement().
4266 spin_lock_bh(&conn->state_lock);
4267 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4268 spin_unlock_bh(&conn->state_lock);
4269 complete(&conn->conn_wait_comp);
4270 wait_for_completion(&conn->conn_post_wait_comp);
4271 spin_lock_bh(&conn->state_lock);
4275 * If connection reinstatement is being performed on this connection
4276 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4277 * connection wait rcfr semaphore that is being blocked on
4278 * an iscsit_connection_reinstatement_rcfr().
4280 if (atomic_read(&conn->connection_wait_rcfr)) {
4281 spin_unlock_bh(&conn->state_lock);
4282 complete(&conn->conn_wait_rcfr_comp);
4283 wait_for_completion(&conn->conn_post_wait_comp);
4284 spin_lock_bh(&conn->state_lock);
4286 atomic_set(&conn->connection_reinstatement, 1);
4287 spin_unlock_bh(&conn->state_lock);
4290 * If any other processes are accessing this connection pointer we
4291 * must wait until they have completed.
4293 iscsit_check_conn_usage_count(conn);
4295 if (conn->conn_rx_hash.tfm)
4296 crypto_free_hash(conn->conn_rx_hash.tfm);
4297 if (conn->conn_tx_hash.tfm)
4298 crypto_free_hash(conn->conn_tx_hash.tfm);
4300 if (conn->conn_cpumask)
4301 free_cpumask_var(conn->conn_cpumask);
4303 kfree(conn->conn_ops);
4304 conn->conn_ops = NULL;
4307 sock_release(conn->sock);
4309 if (conn->conn_transport->iscsit_free_conn)
4310 conn->conn_transport->iscsit_free_conn(conn);
4312 iscsit_put_transport(conn->conn_transport);
4314 conn->thread_set = NULL;
4316 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4317 conn->conn_state = TARG_CONN_STATE_FREE;
4320 spin_lock_bh(&sess->conn_lock);
4321 atomic_dec(&sess->nconn);
4322 pr_debug("Decremented iSCSI connection count to %hu from node:"
4323 " %s\n", atomic_read(&sess->nconn),
4324 sess->sess_ops->InitiatorName);
4326 * Make sure that if one connection fails in an non ERL=2 iSCSI
4327 * Session that they all fail.
4329 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4330 !atomic_read(&sess->session_logout))
4331 atomic_set(&sess->session_fall_back_to_erl0, 1);
4334 * If this was not the last connection in the session, and we are
4335 * performing session reinstatement or falling back to ERL=0, call
4336 * iscsit_stop_session() without sleeping to shutdown the other
4337 * active connections.
4339 if (atomic_read(&sess->nconn)) {
4340 if (!atomic_read(&sess->session_reinstatement) &&
4341 !atomic_read(&sess->session_fall_back_to_erl0)) {
4342 spin_unlock_bh(&sess->conn_lock);
4345 if (!atomic_read(&sess->session_stop_active)) {
4346 atomic_set(&sess->session_stop_active, 1);
4347 spin_unlock_bh(&sess->conn_lock);
4348 iscsit_stop_session(sess, 0, 0);
4351 spin_unlock_bh(&sess->conn_lock);
4356 * If this was the last connection in the session and one of the
4357 * following is occurring:
4359 * Session Reinstatement is not being performed, and are falling back
4360 * to ERL=0 call iscsit_close_session().
4362 * Session Logout was requested. iscsit_close_session() will be called
4365 * Session Continuation is not being performed, start the Time2Retain
4366 * handler and check if sleep_on_sess_wait_sem is active.
4368 if (!atomic_read(&sess->session_reinstatement) &&
4369 atomic_read(&sess->session_fall_back_to_erl0)) {
4370 spin_unlock_bh(&sess->conn_lock);
4371 target_put_session(sess->se_sess);
4374 } else if (atomic_read(&sess->session_logout)) {
4375 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4376 sess->session_state = TARG_SESS_STATE_FREE;
4377 spin_unlock_bh(&sess->conn_lock);
4379 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4380 complete(&sess->session_wait_comp);
4384 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4385 sess->session_state = TARG_SESS_STATE_FAILED;
4387 if (!atomic_read(&sess->session_continuation)) {
4388 spin_unlock_bh(&sess->conn_lock);
4389 iscsit_start_time2retain_handler(sess);
4391 spin_unlock_bh(&sess->conn_lock);
4393 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4394 complete(&sess->session_wait_comp);
4398 spin_unlock_bh(&sess->conn_lock);
4403 int iscsit_close_session(struct iscsi_session *sess)
4405 struct iscsi_portal_group *tpg = sess->tpg;
4406 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4408 if (atomic_read(&sess->nconn)) {
4409 pr_err("%d connection(s) still exist for iSCSI session"
4410 " to %s\n", atomic_read(&sess->nconn),
4411 sess->sess_ops->InitiatorName);
4415 spin_lock_bh(&se_tpg->session_lock);
4416 atomic_set(&sess->session_logout, 1);
4417 atomic_set(&sess->session_reinstatement, 1);
4418 iscsit_stop_time2retain_timer(sess);
4419 spin_unlock_bh(&se_tpg->session_lock);
4422 * transport_deregister_session_configfs() will clear the
4423 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4424 * can be setting it again with __transport_register_session() in
4425 * iscsi_post_login_handler() again after the iscsit_stop_session()
4426 * completes in iscsi_np context.
4428 transport_deregister_session_configfs(sess->se_sess);
4431 * If any other processes are accessing this session pointer we must
4432 * wait until they have completed. If we are in an interrupt (the
4433 * time2retain handler) and contain and active session usage count we
4434 * restart the timer and exit.
4436 if (!in_interrupt()) {
4437 if (iscsit_check_session_usage_count(sess) == 1)
4438 iscsit_stop_session(sess, 1, 1);
4440 if (iscsit_check_session_usage_count(sess) == 2) {
4441 atomic_set(&sess->session_logout, 0);
4442 iscsit_start_time2retain_handler(sess);
4447 transport_deregister_session(sess->se_sess);
4449 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4450 iscsit_free_connection_recovery_entires(sess);
4452 iscsit_free_all_ooo_cmdsns(sess);
4454 spin_lock_bh(&se_tpg->session_lock);
4455 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4456 sess->session_state = TARG_SESS_STATE_FREE;
4457 pr_debug("Released iSCSI session from node: %s\n",
4458 sess->sess_ops->InitiatorName);
4461 tpg->tpg_tiqn->tiqn_nsessions--;
4463 pr_debug("Decremented number of active iSCSI Sessions on"
4464 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4466 spin_lock(&sess_idr_lock);
4467 idr_remove(&sess_idr, sess->session_index);
4468 spin_unlock(&sess_idr_lock);
4470 kfree(sess->sess_ops);
4471 sess->sess_ops = NULL;
4472 spin_unlock_bh(&se_tpg->session_lock);
4478 static void iscsit_logout_post_handler_closesession(
4479 struct iscsi_conn *conn)
4481 struct iscsi_session *sess = conn->sess;
4483 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4484 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4486 atomic_set(&conn->conn_logout_remove, 0);
4487 complete(&conn->conn_logout_comp);
4489 iscsit_dec_conn_usage_count(conn);
4490 iscsit_stop_session(sess, 1, 1);
4491 iscsit_dec_session_usage_count(sess);
4492 target_put_session(sess->se_sess);
4495 static void iscsit_logout_post_handler_samecid(
4496 struct iscsi_conn *conn)
4498 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4499 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4501 atomic_set(&conn->conn_logout_remove, 0);
4502 complete(&conn->conn_logout_comp);
4504 iscsit_cause_connection_reinstatement(conn, 1);
4505 iscsit_dec_conn_usage_count(conn);
4508 static void iscsit_logout_post_handler_diffcid(
4509 struct iscsi_conn *conn,
4512 struct iscsi_conn *l_conn;
4513 struct iscsi_session *sess = conn->sess;
4518 spin_lock_bh(&sess->conn_lock);
4519 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4520 if (l_conn->cid == cid) {
4521 iscsit_inc_conn_usage_count(l_conn);
4525 spin_unlock_bh(&sess->conn_lock);
4531 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4533 spin_lock_bh(&l_conn->state_lock);
4534 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4535 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4536 spin_unlock_bh(&l_conn->state_lock);
4538 iscsit_cause_connection_reinstatement(l_conn, 1);
4539 iscsit_dec_conn_usage_count(l_conn);
4543 * Return of 0 causes the TX thread to restart.
4545 int iscsit_logout_post_handler(
4546 struct iscsi_cmd *cmd,
4547 struct iscsi_conn *conn)
4551 switch (cmd->logout_reason) {
4552 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4553 switch (cmd->logout_response) {
4554 case ISCSI_LOGOUT_SUCCESS:
4555 case ISCSI_LOGOUT_CLEANUP_FAILED:
4557 iscsit_logout_post_handler_closesession(conn);
4562 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4563 if (conn->cid == cmd->logout_cid) {
4564 switch (cmd->logout_response) {
4565 case ISCSI_LOGOUT_SUCCESS:
4566 case ISCSI_LOGOUT_CLEANUP_FAILED:
4568 iscsit_logout_post_handler_samecid(conn);
4573 switch (cmd->logout_response) {
4574 case ISCSI_LOGOUT_SUCCESS:
4575 iscsit_logout_post_handler_diffcid(conn,
4578 case ISCSI_LOGOUT_CID_NOT_FOUND:
4579 case ISCSI_LOGOUT_CLEANUP_FAILED:
4586 case ISCSI_LOGOUT_REASON_RECOVERY:
4587 switch (cmd->logout_response) {
4588 case ISCSI_LOGOUT_SUCCESS:
4589 case ISCSI_LOGOUT_CID_NOT_FOUND:
4590 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4591 case ISCSI_LOGOUT_CLEANUP_FAILED:
4603 EXPORT_SYMBOL(iscsit_logout_post_handler);
4605 void iscsit_fail_session(struct iscsi_session *sess)
4607 struct iscsi_conn *conn;
4609 spin_lock_bh(&sess->conn_lock);
4610 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4611 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4612 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4614 spin_unlock_bh(&sess->conn_lock);
4616 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4617 sess->session_state = TARG_SESS_STATE_FAILED;
4620 int iscsit_free_session(struct iscsi_session *sess)
4622 u16 conn_count = atomic_read(&sess->nconn);
4623 struct iscsi_conn *conn, *conn_tmp = NULL;
4626 spin_lock_bh(&sess->conn_lock);
4627 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4629 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4631 if (conn_count == 0)
4634 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4637 iscsit_inc_conn_usage_count(conn_tmp);
4640 iscsit_inc_conn_usage_count(conn);
4642 spin_unlock_bh(&sess->conn_lock);
4643 iscsit_cause_connection_reinstatement(conn, 1);
4644 spin_lock_bh(&sess->conn_lock);
4646 iscsit_dec_conn_usage_count(conn);
4648 iscsit_dec_conn_usage_count(conn_tmp);
4653 if (atomic_read(&sess->nconn)) {
4654 spin_unlock_bh(&sess->conn_lock);
4655 wait_for_completion(&sess->session_wait_comp);
4657 spin_unlock_bh(&sess->conn_lock);
4659 target_put_session(sess->se_sess);
4663 void iscsit_stop_session(
4664 struct iscsi_session *sess,
4666 int connection_sleep)
4668 u16 conn_count = atomic_read(&sess->nconn);
4669 struct iscsi_conn *conn, *conn_tmp = NULL;
4672 spin_lock_bh(&sess->conn_lock);
4674 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4676 if (connection_sleep) {
4677 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4679 if (conn_count == 0)
4682 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4685 iscsit_inc_conn_usage_count(conn_tmp);
4688 iscsit_inc_conn_usage_count(conn);
4690 spin_unlock_bh(&sess->conn_lock);
4691 iscsit_cause_connection_reinstatement(conn, 1);
4692 spin_lock_bh(&sess->conn_lock);
4694 iscsit_dec_conn_usage_count(conn);
4696 iscsit_dec_conn_usage_count(conn_tmp);
4700 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4701 iscsit_cause_connection_reinstatement(conn, 0);
4704 if (session_sleep && atomic_read(&sess->nconn)) {
4705 spin_unlock_bh(&sess->conn_lock);
4706 wait_for_completion(&sess->session_wait_comp);
4708 spin_unlock_bh(&sess->conn_lock);
4711 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4713 struct iscsi_session *sess;
4714 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4715 struct se_session *se_sess, *se_sess_tmp;
4716 int session_count = 0;
4718 spin_lock_bh(&se_tpg->session_lock);
4719 if (tpg->nsessions && !force) {
4720 spin_unlock_bh(&se_tpg->session_lock);
4724 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4726 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4728 spin_lock(&sess->conn_lock);
4729 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4730 atomic_read(&sess->session_logout) ||
4731 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4732 spin_unlock(&sess->conn_lock);
4735 atomic_set(&sess->session_reinstatement, 1);
4736 spin_unlock(&sess->conn_lock);
4737 spin_unlock_bh(&se_tpg->session_lock);
4739 iscsit_free_session(sess);
4740 spin_lock_bh(&se_tpg->session_lock);
4744 spin_unlock_bh(&se_tpg->session_lock);
4746 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4747 " Group: %hu\n", session_count, tpg->tpgt);
4751 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4752 MODULE_VERSION("4.1.x");
4753 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4754 MODULE_LICENSE("GPL");
4756 module_init(iscsi_target_init_module);
4757 module_exit(iscsi_target_cleanup_module);