1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <linux/idr.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/iscsi_proto.h>
30 #include <scsi/scsi_tcq.h>
31 #include <target/target_core_base.h>
32 #include <target/target_core_fabric.h>
33 #include <target/target_core_configfs.h>
35 #include "iscsi_target_core.h"
36 #include "iscsi_target_parameters.h"
37 #include "iscsi_target_seq_pdu_list.h"
38 #include "iscsi_target_tq.h"
39 #include "iscsi_target_configfs.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include "iscsi_target_stat.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_cmd_cache;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 unsigned char *buf, u32);
72 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
76 struct iscsi_tiqn *tiqn = NULL;
78 spin_lock(&tiqn_lock);
79 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
80 if (!strcmp(tiqn->tiqn, buf)) {
82 spin_lock(&tiqn->tiqn_state_lock);
83 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
84 tiqn->tiqn_access_count++;
85 spin_unlock(&tiqn->tiqn_state_lock);
86 spin_unlock(&tiqn_lock);
89 spin_unlock(&tiqn->tiqn_state_lock);
92 spin_unlock(&tiqn_lock);
97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
99 spin_lock(&tiqn->tiqn_state_lock);
100 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
101 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
102 spin_unlock(&tiqn->tiqn_state_lock);
105 spin_unlock(&tiqn->tiqn_state_lock);
110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
112 spin_lock(&tiqn->tiqn_state_lock);
113 tiqn->tiqn_access_count--;
114 spin_unlock(&tiqn->tiqn_state_lock);
118 * Note that IQN formatting is expected to be done in userspace, and
119 * no explict IQN format checks are done here.
121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
123 struct iscsi_tiqn *tiqn = NULL;
126 if (strlen(buf) >= ISCSI_IQN_LEN) {
127 pr_err("Target IQN exceeds %d bytes\n",
129 return ERR_PTR(-EINVAL);
132 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
134 pr_err("Unable to allocate struct iscsi_tiqn\n");
135 return ERR_PTR(-ENOMEM);
138 sprintf(tiqn->tiqn, "%s", buf);
139 INIT_LIST_HEAD(&tiqn->tiqn_list);
140 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
141 spin_lock_init(&tiqn->tiqn_state_lock);
142 spin_lock_init(&tiqn->tiqn_tpg_lock);
143 spin_lock_init(&tiqn->sess_err_stats.lock);
144 spin_lock_init(&tiqn->login_stats.lock);
145 spin_lock_init(&tiqn->logout_stats.lock);
147 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
148 pr_err("idr_pre_get() for tiqn_idr failed\n");
150 return ERR_PTR(-ENOMEM);
152 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
154 spin_lock(&tiqn_lock);
155 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
157 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
158 spin_unlock(&tiqn_lock);
162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
163 spin_unlock(&tiqn_lock);
165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
174 * Wait for accesses to said struct iscsi_tiqn to end.
176 spin_lock(&tiqn->tiqn_state_lock);
177 while (tiqn->tiqn_access_count != 0) {
178 spin_unlock(&tiqn->tiqn_state_lock);
180 spin_lock(&tiqn->tiqn_state_lock);
182 spin_unlock(&tiqn->tiqn_state_lock);
185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
189 * while holding tiqn->tiqn_state_lock. This means that all subsequent
190 * attempts to access this struct iscsi_tiqn will fail from both transport
191 * fabric and control code paths.
193 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
194 pr_err("iscsit_set_tiqn_shutdown() failed\n");
198 iscsit_wait_for_tiqn(tiqn);
200 spin_lock(&tiqn_lock);
201 list_del(&tiqn->tiqn_list);
202 idr_remove(&tiqn_idr, tiqn->tiqn_index);
203 spin_unlock(&tiqn_lock);
205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
214 * Determine if the network portal is accepting storage traffic.
216 spin_lock_bh(&np->np_thread_lock);
217 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
218 spin_unlock_bh(&np->np_thread_lock);
221 if (np->np_login_tpg) {
222 pr_err("np->np_login_tpg() is not NULL!\n");
223 spin_unlock_bh(&np->np_thread_lock);
226 spin_unlock_bh(&np->np_thread_lock);
228 * Determine if the portal group is accepting storage traffic.
230 spin_lock_bh(&tpg->tpg_state_lock);
231 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
232 spin_unlock_bh(&tpg->tpg_state_lock);
235 spin_unlock_bh(&tpg->tpg_state_lock);
238 * Here we serialize access across the TIQN+TPG Tuple.
240 ret = mutex_lock_interruptible(&tpg->np_login_lock);
241 if ((ret != 0) || signal_pending(current))
244 spin_lock_bh(&np->np_thread_lock);
245 np->np_login_tpg = tpg;
246 spin_unlock_bh(&np->np_thread_lock);
251 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
253 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
255 spin_lock_bh(&np->np_thread_lock);
256 np->np_login_tpg = NULL;
257 spin_unlock_bh(&np->np_thread_lock);
259 mutex_unlock(&tpg->np_login_lock);
262 iscsit_put_tiqn_for_login(tiqn);
267 static struct iscsi_np *iscsit_get_np(
268 struct __kernel_sockaddr_storage *sockaddr,
269 int network_transport)
271 struct sockaddr_in *sock_in, *sock_in_e;
272 struct sockaddr_in6 *sock_in6, *sock_in6_e;
277 spin_lock_bh(&np_lock);
278 list_for_each_entry(np, &g_np_list, np_list) {
279 spin_lock(&np->np_thread_lock);
280 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
281 spin_unlock(&np->np_thread_lock);
285 if (sockaddr->ss_family == AF_INET6) {
286 sock_in6 = (struct sockaddr_in6 *)sockaddr;
287 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
289 if (!memcmp(&sock_in6->sin6_addr.in6_u,
290 &sock_in6_e->sin6_addr.in6_u,
291 sizeof(struct in6_addr)))
294 port = ntohs(sock_in6->sin6_port);
296 sock_in = (struct sockaddr_in *)sockaddr;
297 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
299 if (sock_in->sin_addr.s_addr ==
300 sock_in_e->sin_addr.s_addr)
303 port = ntohs(sock_in->sin_port);
306 if ((ip_match == 1) && (np->np_port == port) &&
307 (np->np_network_transport == network_transport)) {
309 * Increment the np_exports reference count now to
310 * prevent iscsit_del_np() below from being called
311 * while iscsi_tpg_add_network_portal() is called.
314 spin_unlock(&np->np_thread_lock);
315 spin_unlock_bh(&np_lock);
318 spin_unlock(&np->np_thread_lock);
320 spin_unlock_bh(&np_lock);
325 struct iscsi_np *iscsit_add_np(
326 struct __kernel_sockaddr_storage *sockaddr,
328 int network_transport)
330 struct sockaddr_in *sock_in;
331 struct sockaddr_in6 *sock_in6;
335 * Locate the existing struct iscsi_np if already active..
337 np = iscsit_get_np(sockaddr, network_transport);
341 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
343 pr_err("Unable to allocate memory for struct iscsi_np\n");
344 return ERR_PTR(-ENOMEM);
347 np->np_flags |= NPF_IP_NETWORK;
348 if (sockaddr->ss_family == AF_INET6) {
349 sock_in6 = (struct sockaddr_in6 *)sockaddr;
350 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
351 np->np_port = ntohs(sock_in6->sin6_port);
353 sock_in = (struct sockaddr_in *)sockaddr;
354 sprintf(np->np_ip, "%s", ip_str);
355 np->np_port = ntohs(sock_in->sin_port);
358 np->np_network_transport = network_transport;
359 spin_lock_init(&np->np_thread_lock);
360 init_completion(&np->np_restart_comp);
361 INIT_LIST_HEAD(&np->np_list);
363 ret = iscsi_target_setup_login_socket(np, sockaddr);
369 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
370 if (IS_ERR(np->np_thread)) {
371 pr_err("Unable to create kthread: iscsi_np\n");
372 ret = PTR_ERR(np->np_thread);
377 * Increment the np_exports reference count now to prevent
378 * iscsit_del_np() below from being run while a new call to
379 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
380 * active. We don't need to hold np->np_thread_lock at this
381 * point because iscsi_np has not been added to g_np_list yet.
385 spin_lock_bh(&np_lock);
386 list_add_tail(&np->np_list, &g_np_list);
387 spin_unlock_bh(&np_lock);
389 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
390 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
396 int iscsit_reset_np_thread(
398 struct iscsi_tpg_np *tpg_np,
399 struct iscsi_portal_group *tpg)
401 spin_lock_bh(&np->np_thread_lock);
404 * The reset operation need only be performed when the
405 * passed struct iscsi_portal_group has a login in progress
406 * to one of the network portals.
408 if (tpg_np->tpg_np->np_login_tpg != tpg) {
409 spin_unlock_bh(&np->np_thread_lock);
413 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
414 spin_unlock_bh(&np->np_thread_lock);
417 np->np_thread_state = ISCSI_NP_THREAD_RESET;
420 spin_unlock_bh(&np->np_thread_lock);
421 send_sig(SIGINT, np->np_thread, 1);
422 wait_for_completion(&np->np_restart_comp);
423 spin_lock_bh(&np->np_thread_lock);
425 spin_unlock_bh(&np->np_thread_lock);
430 static int iscsit_del_np_comm(struct iscsi_np *np)
433 sock_release(np->np_socket);
437 int iscsit_del_np(struct iscsi_np *np)
439 spin_lock_bh(&np->np_thread_lock);
441 if (np->np_exports) {
442 spin_unlock_bh(&np->np_thread_lock);
445 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
446 spin_unlock_bh(&np->np_thread_lock);
450 * We need to send the signal to wakeup Linux/Net
451 * which may be sleeping in sock_accept()..
453 send_sig(SIGINT, np->np_thread, 1);
454 kthread_stop(np->np_thread);
456 iscsit_del_np_comm(np);
458 spin_lock_bh(&np_lock);
459 list_del(&np->np_list);
460 spin_unlock_bh(&np_lock);
462 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
463 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
470 static int __init iscsi_target_init_module(void)
474 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
476 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
477 if (!iscsit_global) {
478 pr_err("Unable to allocate memory for iscsit_global\n");
481 mutex_init(&auth_id_lock);
482 spin_lock_init(&sess_idr_lock);
486 ret = iscsi_target_register_configfs();
490 ret = iscsi_thread_set_init();
494 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
495 TARGET_THREAD_SET_COUNT) {
496 pr_err("iscsi_allocate_thread_sets() returned"
497 " unexpected value!\n");
501 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
502 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
504 if (!lio_cmd_cache) {
505 pr_err("Unable to kmem_cache_create() for"
510 lio_qr_cache = kmem_cache_create("lio_qr_cache",
511 sizeof(struct iscsi_queue_req),
512 __alignof__(struct iscsi_queue_req), 0, NULL);
514 pr_err("nable to kmem_cache_create() for"
519 lio_dr_cache = kmem_cache_create("lio_dr_cache",
520 sizeof(struct iscsi_datain_req),
521 __alignof__(struct iscsi_datain_req), 0, NULL);
523 pr_err("Unable to kmem_cache_create() for"
528 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
529 sizeof(struct iscsi_ooo_cmdsn),
530 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
531 if (!lio_ooo_cache) {
532 pr_err("Unable to kmem_cache_create() for"
537 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
538 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
540 if (!lio_r2t_cache) {
541 pr_err("Unable to kmem_cache_create() for"
546 if (iscsit_load_discovery_tpg() < 0)
551 kmem_cache_destroy(lio_r2t_cache);
553 kmem_cache_destroy(lio_ooo_cache);
555 kmem_cache_destroy(lio_dr_cache);
557 kmem_cache_destroy(lio_qr_cache);
559 kmem_cache_destroy(lio_cmd_cache);
561 iscsi_deallocate_thread_sets();
563 iscsi_thread_set_free();
565 iscsi_target_deregister_configfs();
567 kfree(iscsit_global);
571 static void __exit iscsi_target_cleanup_module(void)
573 iscsi_deallocate_thread_sets();
574 iscsi_thread_set_free();
575 iscsit_release_discovery_tpg();
576 kmem_cache_destroy(lio_cmd_cache);
577 kmem_cache_destroy(lio_qr_cache);
578 kmem_cache_destroy(lio_dr_cache);
579 kmem_cache_destroy(lio_ooo_cache);
580 kmem_cache_destroy(lio_r2t_cache);
582 iscsi_target_deregister_configfs();
584 kfree(iscsit_global);
587 static int iscsit_add_reject(
591 struct iscsi_conn *conn)
593 struct iscsi_cmd *cmd;
594 struct iscsi_reject *hdr;
597 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
601 cmd->iscsi_opcode = ISCSI_OP_REJECT;
603 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
605 hdr = (struct iscsi_reject *) cmd->pdu;
606 hdr->reason = reason;
608 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
610 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
611 iscsit_release_cmd(cmd);
615 spin_lock_bh(&conn->cmd_lock);
616 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
617 spin_unlock_bh(&conn->cmd_lock);
619 cmd->i_state = ISTATE_SEND_REJECT;
620 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
622 ret = wait_for_completion_interruptible(&cmd->reject_comp);
626 return (!fail_conn) ? 0 : -1;
629 int iscsit_add_reject_from_cmd(
634 struct iscsi_cmd *cmd)
636 struct iscsi_conn *conn;
637 struct iscsi_reject *hdr;
641 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
647 cmd->iscsi_opcode = ISCSI_OP_REJECT;
649 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
651 hdr = (struct iscsi_reject *) cmd->pdu;
652 hdr->reason = reason;
654 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
656 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
657 iscsit_release_cmd(cmd);
662 spin_lock_bh(&conn->cmd_lock);
663 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
664 spin_unlock_bh(&conn->cmd_lock);
667 cmd->i_state = ISTATE_SEND_REJECT;
668 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
670 ret = wait_for_completion_interruptible(&cmd->reject_comp);
674 return (!fail_conn) ? 0 : -1;
678 * Map some portion of the allocated scatterlist to an iovec, suitable for
679 * kernel sockets to copy data in/out.
681 static int iscsit_map_iovec(
682 struct iscsi_cmd *cmd,
688 struct scatterlist *sg;
689 unsigned int page_off;
692 * We know each entry in t_data_sg contains a page.
694 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
695 page_off = (data_offset % PAGE_SIZE);
697 cmd->first_data_sg = sg;
698 cmd->first_data_sg_off = page_off;
700 while (data_length) {
701 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
703 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
704 iov[i].iov_len = cur_len;
706 data_length -= cur_len;
712 cmd->kmapped_nents = i;
717 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
720 struct scatterlist *sg;
722 sg = cmd->first_data_sg;
724 for (i = 0; i < cmd->kmapped_nents; i++)
725 kunmap(sg_page(&sg[i]));
728 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
730 struct iscsi_cmd *cmd;
732 conn->exp_statsn = exp_statsn;
734 spin_lock_bh(&conn->cmd_lock);
735 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
736 spin_lock(&cmd->istate_lock);
737 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
738 (cmd->stat_sn < exp_statsn)) {
739 cmd->i_state = ISTATE_REMOVE;
740 spin_unlock(&cmd->istate_lock);
741 iscsit_add_cmd_to_immediate_queue(cmd, conn,
745 spin_unlock(&cmd->istate_lock);
747 spin_unlock_bh(&conn->cmd_lock);
750 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
752 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
754 iov_count += ISCSI_IOV_DATA_BUFFER;
756 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
757 if (!cmd->iov_data) {
758 pr_err("Unable to allocate cmd->iov_data\n");
762 cmd->orig_iov_data_count = iov_count;
766 static int iscsit_handle_scsi_cmd(
767 struct iscsi_conn *conn,
770 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
771 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
772 struct iscsi_cmd *cmd = NULL;
773 struct iscsi_scsi_req *hdr;
777 spin_lock_bh(&conn->sess->session_stats_lock);
778 conn->sess->cmd_pdus++;
779 if (conn->sess->se_sess->se_node_acl) {
780 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
781 conn->sess->se_sess->se_node_acl->num_cmds++;
782 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
784 spin_unlock_bh(&conn->sess->session_stats_lock);
786 hdr = (struct iscsi_scsi_req *) buf;
787 payload_length = ntoh24(hdr->dlength);
789 /* FIXME; Add checks for AdditionalHeaderSegment */
791 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
792 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
793 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
794 " not set. Bad iSCSI Initiator.\n");
795 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
799 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
800 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
802 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
803 * that adds support for RESERVE/RELEASE. There is a bug
804 * add with this new functionality that sets R/W bits when
805 * neither CDB carries any READ or WRITE datapayloads.
807 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
808 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
809 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
813 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
814 " set when Expected Data Transfer Length is 0 for"
815 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
816 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
821 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
822 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
823 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
824 " MUST be set if Expected Data Transfer Length is not 0."
825 " Bad iSCSI Initiator\n");
826 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
830 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
831 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
832 pr_err("Bidirectional operations not supported!\n");
833 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
837 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
838 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
839 " Scsi Command PDU.\n");
840 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
844 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
845 pr_err("ImmediateData=No but DataSegmentLength=%u,"
846 " protocol error.\n", payload_length);
847 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
851 if ((be32_to_cpu(hdr->data_length )== payload_length) &&
852 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
853 pr_err("Expected Data Transfer Length and Length of"
854 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
855 " bit is not set protocol error\n");
856 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
860 if (payload_length > be32_to_cpu(hdr->data_length)) {
861 pr_err("DataSegmentLength: %u is greater than"
862 " EDTL: %u, protocol error.\n", payload_length,
864 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
868 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
869 pr_err("DataSegmentLength: %u is greater than"
870 " MaxXmitDataSegmentLength: %u, protocol error.\n",
871 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
872 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
876 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
877 pr_err("DataSegmentLength: %u is greater than"
878 " FirstBurstLength: %u, protocol error.\n",
879 payload_length, conn->sess->sess_ops->FirstBurstLength);
880 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
884 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
885 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
888 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
890 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
893 cmd->data_direction = data_direction;
894 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
896 * Figure out the SAM Task Attribute for the incoming SCSI CDB
898 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
899 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
900 sam_task_attr = MSG_SIMPLE_TAG;
901 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
902 sam_task_attr = MSG_ORDERED_TAG;
903 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
904 sam_task_attr = MSG_HEAD_TAG;
905 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
906 sam_task_attr = MSG_ACA_TAG;
908 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
909 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
910 sam_task_attr = MSG_SIMPLE_TAG;
913 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
914 cmd->i_state = ISTATE_NEW_CMD;
915 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
916 cmd->immediate_data = (payload_length) ? 1 : 0;
917 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
918 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
919 if (cmd->unsolicited_data)
920 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
922 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
923 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
924 spin_lock_bh(&conn->sess->ttt_lock);
925 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
926 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
927 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
928 spin_unlock_bh(&conn->sess->ttt_lock);
929 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
930 cmd->targ_xfer_tag = 0xFFFFFFFF;
931 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
932 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
933 cmd->first_burst_len = payload_length;
935 if (cmd->data_direction == DMA_FROM_DEVICE) {
936 struct iscsi_datain_req *dr;
938 dr = iscsit_allocate_datain_req();
940 return iscsit_add_reject_from_cmd(
941 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
944 iscsit_attach_datain_req(cmd, dr);
948 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
950 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
951 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
952 cmd->data_direction, sam_task_attr,
953 cmd->sense_buffer + 2);
955 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
956 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
957 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
960 * The CDB is going to an se_device_t.
962 ret = transport_lookup_cmd_lun(&cmd->se_cmd,
963 scsilun_to_int(&hdr->lun));
965 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
966 pr_debug("Responding to non-acl'ed,"
967 " non-existent or non-exported iSCSI LUN:"
968 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
970 send_check_condition = 1;
974 transport_ret = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
975 if (transport_ret == -ENOMEM) {
976 return iscsit_add_reject_from_cmd(
977 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
979 } else if (transport_ret < 0) {
981 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
982 * in iscsit_execute_cmd() during the CmdSN OOO Execution
985 send_check_condition = 1;
987 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0)
988 return iscsit_add_reject_from_cmd(
989 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
994 spin_lock_bh(&conn->cmd_lock);
995 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
996 spin_unlock_bh(&conn->cmd_lock);
998 * Check if we need to delay processing because of ALUA
999 * Active/NonOptimized primary access state..
1001 core_alua_check_nonop_delay(&cmd->se_cmd);
1003 ret = iscsit_allocate_iovecs(cmd);
1005 return iscsit_add_reject_from_cmd(
1006 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1009 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1010 * the Immediate Bit is not set, and no Immediate
1013 * A PDU/CmdSN carrying Immediate Data can only
1014 * be processed after the DataCRC has passed.
1015 * If the DataCRC fails, the CmdSN MUST NOT
1016 * be acknowledged. (See below)
1018 if (!cmd->immediate_data) {
1019 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1020 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1022 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1023 return iscsit_add_reject_from_cmd(
1024 ISCSI_REASON_PROTOCOL_ERROR,
1028 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1031 * If no Immediate Data is attached, it's OK to return now.
1033 if (!cmd->immediate_data) {
1034 if (send_check_condition)
1037 if (cmd->unsolicited_data) {
1038 iscsit_set_dataout_sequence_values(cmd);
1040 spin_lock_bh(&cmd->dataout_timeout_lock);
1041 iscsit_start_dataout_timer(cmd, cmd->conn);
1042 spin_unlock_bh(&cmd->dataout_timeout_lock);
1049 * Early CHECK_CONDITIONs never make it to the transport processing
1050 * thread. They are processed in CmdSN order by
1051 * iscsit_check_received_cmdsn() below.
1053 if (send_check_condition) {
1054 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1055 dump_immediate_data = 1;
1056 goto after_immediate_data;
1059 * Call directly into transport_generic_new_cmd() to perform
1060 * the backend memory allocation.
1062 ret = transport_generic_new_cmd(&cmd->se_cmd);
1064 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1065 dump_immediate_data = 1;
1066 goto after_immediate_data;
1069 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1070 after_immediate_data:
1071 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1073 * A PDU/CmdSN carrying Immediate Data passed
1074 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1075 * Immediate Bit is not set.
1077 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1079 * Special case for Unsupported SAM WRITE Opcodes
1080 * and ImmediateData=Yes.
1082 if (dump_immediate_data) {
1083 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1085 } else if (cmd->unsolicited_data) {
1086 iscsit_set_dataout_sequence_values(cmd);
1088 spin_lock_bh(&cmd->dataout_timeout_lock);
1089 iscsit_start_dataout_timer(cmd, cmd->conn);
1090 spin_unlock_bh(&cmd->dataout_timeout_lock);
1093 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1094 return iscsit_add_reject_from_cmd(
1095 ISCSI_REASON_PROTOCOL_ERROR,
1098 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1100 * Immediate Data failed DataCRC and ERL>=1,
1101 * silently drop this PDU and let the initiator
1102 * plug the CmdSN gap.
1104 * FIXME: Send Unsolicited NOPIN with reserved
1105 * TTT here to help the initiator figure out
1106 * the missing CmdSN, although they should be
1107 * intelligent enough to determine the missing
1108 * CmdSN and issue a retry to plug the sequence.
1110 cmd->i_state = ISTATE_REMOVE;
1111 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1112 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1118 static u32 iscsit_do_crypto_hash_sg(
1119 struct hash_desc *hash,
1120 struct iscsi_cmd *cmd,
1128 struct scatterlist *sg;
1129 unsigned int page_off;
1131 crypto_hash_init(hash);
1133 sg = cmd->first_data_sg;
1134 page_off = cmd->first_data_sg_off;
1137 while (data_length) {
1138 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1140 crypto_hash_update(hash, &sg[i], cur_len);
1142 data_length -= cur_len;
1148 struct scatterlist pad_sg;
1150 sg_init_one(&pad_sg, pad_bytes, padding);
1151 crypto_hash_update(hash, &pad_sg, padding);
1153 crypto_hash_final(hash, (u8 *) &data_crc);
1158 static void iscsit_do_crypto_hash_buf(
1159 struct hash_desc *hash,
1166 struct scatterlist sg;
1168 crypto_hash_init(hash);
1170 sg_init_one(&sg, buf, payload_length);
1171 crypto_hash_update(hash, &sg, payload_length);
1174 sg_init_one(&sg, pad_bytes, padding);
1175 crypto_hash_update(hash, &sg, padding);
1177 crypto_hash_final(hash, data_crc);
1180 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1182 int iov_ret, ooo_cmdsn = 0, ret;
1183 u8 data_crc_failed = 0;
1184 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1185 u32 rx_size = 0, payload_length;
1186 struct iscsi_cmd *cmd = NULL;
1187 struct se_cmd *se_cmd;
1188 struct iscsi_data *hdr;
1190 unsigned long flags;
1192 hdr = (struct iscsi_data *) buf;
1193 payload_length = ntoh24(hdr->dlength);
1195 if (!payload_length) {
1196 pr_err("DataOUT payload is ZERO, protocol error.\n");
1197 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1202 spin_lock_bh(&conn->sess->session_stats_lock);
1203 conn->sess->rx_data_octets += payload_length;
1204 if (conn->sess->se_sess->se_node_acl) {
1205 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1206 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1207 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1209 spin_unlock_bh(&conn->sess->session_stats_lock);
1211 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1212 pr_err("DataSegmentLength: %u is greater than"
1213 " MaxXmitDataSegmentLength: %u\n", payload_length,
1214 conn->conn_ops->MaxXmitDataSegmentLength);
1215 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1219 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1224 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1225 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1226 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1227 payload_length, conn->cid);
1229 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1230 pr_err("Command ITT: 0x%08x received DataOUT after"
1231 " last DataOUT received, dumping payload\n",
1232 cmd->init_task_tag);
1233 return iscsit_dump_data_payload(conn, payload_length, 1);
1236 if (cmd->data_direction != DMA_TO_DEVICE) {
1237 pr_err("Command ITT: 0x%08x received DataOUT for a"
1238 " NON-WRITE command.\n", cmd->init_task_tag);
1239 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1242 se_cmd = &cmd->se_cmd;
1243 iscsit_mod_dataout_timer(cmd);
1245 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1246 pr_err("DataOut Offset: %u, Length %u greater than"
1247 " iSCSI Command EDTL %u, protocol error.\n",
1248 hdr->offset, payload_length, cmd->se_cmd.data_length);
1249 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1253 if (cmd->unsolicited_data) {
1254 int dump_unsolicited_data = 0;
1256 if (conn->sess->sess_ops->InitialR2T) {
1257 pr_err("Received unexpected unsolicited data"
1258 " while InitialR2T=Yes, protocol error.\n");
1259 transport_send_check_condition_and_sense(&cmd->se_cmd,
1260 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1264 * Special case for dealing with Unsolicited DataOUT
1265 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1269 /* Something's amiss if we're not in WRITE_PENDING state... */
1270 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1271 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1272 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1274 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1275 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1276 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1277 dump_unsolicited_data = 1;
1278 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1280 if (dump_unsolicited_data) {
1282 * Check if a delayed TASK_ABORTED status needs to
1283 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1284 * received with the unsolicitied data out.
1286 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1287 iscsit_stop_dataout_timer(cmd);
1289 transport_check_aborted_status(se_cmd,
1290 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1291 return iscsit_dump_data_payload(conn, payload_length, 1);
1295 * For the normal solicited data path:
1297 * Check for a delayed TASK_ABORTED status and dump any
1298 * incoming data out payload if one exists. Also, when the
1299 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1300 * data out sequence, we decrement outstanding_r2ts. Once
1301 * outstanding_r2ts reaches zero, go ahead and send the delayed
1302 * TASK_ABORTED status.
1304 if (se_cmd->transport_state & CMD_T_ABORTED) {
1305 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1306 if (--cmd->outstanding_r2ts < 1) {
1307 iscsit_stop_dataout_timer(cmd);
1308 transport_check_aborted_status(
1312 return iscsit_dump_data_payload(conn, payload_length, 1);
1316 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1317 * within-command recovery checks before receiving the payload.
1319 ret = iscsit_check_pre_dataout(cmd, buf);
1320 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1322 else if (ret == DATAOUT_CANNOT_RECOVER)
1325 rx_size += payload_length;
1326 iov = &cmd->iov_data[0];
1328 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1333 iov_count += iov_ret;
1335 padding = ((-payload_length) & 3);
1337 iov[iov_count].iov_base = cmd->pad_bytes;
1338 iov[iov_count++].iov_len = padding;
1340 pr_debug("Receiving %u padding bytes.\n", padding);
1343 if (conn->conn_ops->DataDigest) {
1344 iov[iov_count].iov_base = &checksum;
1345 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1346 rx_size += ISCSI_CRC_LEN;
1349 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1351 iscsit_unmap_iovec(cmd);
1353 if (rx_got != rx_size)
1356 if (conn->conn_ops->DataDigest) {
1359 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1360 be32_to_cpu(hdr->offset),
1361 payload_length, padding,
1364 if (checksum != data_crc) {
1365 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1366 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1367 " does not match computed 0x%08x\n",
1368 hdr->itt, hdr->offset, payload_length,
1369 hdr->datasn, checksum, data_crc);
1370 data_crc_failed = 1;
1372 pr_debug("Got CRC32C DataDigest 0x%08x for"
1373 " %u bytes of Data Out\n", checksum,
1378 * Increment post receive data and CRC values or perform
1379 * within-command recovery.
1381 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1382 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1384 else if (ret == DATAOUT_SEND_R2T) {
1385 iscsit_set_dataout_sequence_values(cmd);
1386 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1387 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1389 * Handle extra special case for out of order
1390 * Unsolicited Data Out.
1392 spin_lock_bh(&cmd->istate_lock);
1393 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1394 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1395 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1396 spin_unlock_bh(&cmd->istate_lock);
1398 iscsit_stop_dataout_timer(cmd);
1401 target_execute_cmd(&cmd->se_cmd);
1403 } else /* DATAOUT_CANNOT_RECOVER */
1409 static int iscsit_handle_nop_out(
1410 struct iscsi_conn *conn,
1413 unsigned char *ping_data = NULL;
1414 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1415 u32 checksum, data_crc, padding = 0, payload_length;
1416 struct iscsi_cmd *cmd = NULL;
1417 struct kvec *iov = NULL;
1418 struct iscsi_nopout *hdr;
1420 hdr = (struct iscsi_nopout *) buf;
1421 payload_length = ntoh24(hdr->dlength);
1423 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1424 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1425 " not set, protocol error.\n");
1426 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1430 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1431 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1432 " greater than MaxXmitDataSegmentLength: %u, protocol"
1433 " error.\n", payload_length,
1434 conn->conn_ops->MaxXmitDataSegmentLength);
1435 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1439 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1440 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1441 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1442 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1445 * This is not a response to a Unsolicited NopIN, which means
1446 * it can either be a NOPOUT ping request (with a valid ITT),
1447 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1448 * Either way, make sure we allocate an struct iscsi_cmd, as both
1449 * can contain ping data.
1451 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1452 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1454 return iscsit_add_reject(
1455 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1458 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1459 cmd->i_state = ISTATE_SEND_NOPIN;
1460 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1462 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1463 cmd->targ_xfer_tag = 0xFFFFFFFF;
1464 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1465 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1466 cmd->data_direction = DMA_NONE;
1469 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1470 rx_size = payload_length;
1471 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1473 pr_err("Unable to allocate memory for"
1474 " NOPOUT ping data.\n");
1479 iov = &cmd->iov_misc[0];
1480 iov[niov].iov_base = ping_data;
1481 iov[niov++].iov_len = payload_length;
1483 padding = ((-payload_length) & 3);
1485 pr_debug("Receiving %u additional bytes"
1486 " for padding.\n", padding);
1487 iov[niov].iov_base = &cmd->pad_bytes;
1488 iov[niov++].iov_len = padding;
1491 if (conn->conn_ops->DataDigest) {
1492 iov[niov].iov_base = &checksum;
1493 iov[niov++].iov_len = ISCSI_CRC_LEN;
1494 rx_size += ISCSI_CRC_LEN;
1497 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1498 if (rx_got != rx_size) {
1503 if (conn->conn_ops->DataDigest) {
1504 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1505 ping_data, payload_length,
1506 padding, cmd->pad_bytes,
1509 if (checksum != data_crc) {
1510 pr_err("Ping data CRC32C DataDigest"
1511 " 0x%08x does not match computed 0x%08x\n",
1512 checksum, data_crc);
1513 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1514 pr_err("Unable to recover from"
1515 " NOPOUT Ping DataCRC failure while in"
1521 * Silently drop this PDU and let the
1522 * initiator plug the CmdSN gap.
1524 pr_debug("Dropping NOPOUT"
1525 " Command CmdSN: 0x%08x due to"
1526 " DataCRC error.\n", hdr->cmdsn);
1531 pr_debug("Got CRC32C DataDigest"
1532 " 0x%08x for %u bytes of ping data.\n",
1533 checksum, payload_length);
1537 ping_data[payload_length] = '\0';
1539 * Attach ping data to struct iscsi_cmd->buf_ptr.
1541 cmd->buf_ptr = ping_data;
1542 cmd->buf_ptr_size = payload_length;
1544 pr_debug("Got %u bytes of NOPOUT ping"
1545 " data.\n", payload_length);
1546 pr_debug("Ping Data: \"%s\"\n", ping_data);
1549 if (hdr->itt != RESERVED_ITT) {
1551 pr_err("Checking CmdSN for NOPOUT,"
1552 " but cmd is NULL!\n");
1556 * Initiator is expecting a NopIN ping reply,
1558 spin_lock_bh(&conn->cmd_lock);
1559 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1560 spin_unlock_bh(&conn->cmd_lock);
1562 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1564 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1565 iscsit_add_cmd_to_response_queue(cmd, conn,
1570 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1571 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1575 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1576 return iscsit_add_reject_from_cmd(
1577 ISCSI_REASON_PROTOCOL_ERROR,
1583 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1585 * This was a response to a unsolicited NOPIN ping.
1587 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1591 iscsit_stop_nopin_response_timer(conn);
1593 cmd->i_state = ISTATE_REMOVE;
1594 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1595 iscsit_start_nopin_timer(conn);
1598 * Initiator is not expecting a NOPIN is response.
1599 * Just ignore for now.
1601 * iSCSI v19-91 10.18
1602 * "A NOP-OUT may also be used to confirm a changed
1603 * ExpStatSN if another PDU will not be available
1613 iscsit_release_cmd(cmd);
1619 static int iscsit_handle_task_mgt_cmd(
1620 struct iscsi_conn *conn,
1623 struct iscsi_cmd *cmd;
1624 struct se_tmr_req *se_tmr;
1625 struct iscsi_tmr_req *tmr_req;
1626 struct iscsi_tm *hdr;
1627 int out_of_order_cmdsn = 0;
1631 hdr = (struct iscsi_tm *) buf;
1632 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1633 function = hdr->flags;
1635 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1636 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1637 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1638 hdr->rtt, hdr->refcmdsn, conn->cid);
1640 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1641 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1642 hdr->rtt != RESERVED_ITT)) {
1643 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1644 hdr->rtt = RESERVED_ITT;
1647 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1648 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1649 pr_err("Task Management Request TASK_REASSIGN not"
1650 " issued as immediate command, bad iSCSI Initiator"
1651 "implementation\n");
1652 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1655 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1656 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1657 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1659 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1661 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1664 cmd->data_direction = DMA_NONE;
1666 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1667 if (!cmd->tmr_req) {
1668 pr_err("Unable to allocate memory for"
1669 " Task Management command!\n");
1670 return iscsit_add_reject_from_cmd(
1671 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1676 * TASK_REASSIGN for ERL=2 / connection stays inside of
1677 * LIO-Target $FABRIC_MOD
1679 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1684 transport_init_se_cmd(&cmd->se_cmd,
1685 &lio_target_fabric_configfs->tf_ops,
1686 conn->sess->se_sess, 0, DMA_NONE,
1687 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1690 case ISCSI_TM_FUNC_ABORT_TASK:
1691 tcm_function = TMR_ABORT_TASK;
1693 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1694 tcm_function = TMR_ABORT_TASK_SET;
1696 case ISCSI_TM_FUNC_CLEAR_ACA:
1697 tcm_function = TMR_CLEAR_ACA;
1699 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1700 tcm_function = TMR_CLEAR_TASK_SET;
1702 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1703 tcm_function = TMR_LUN_RESET;
1705 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1706 tcm_function = TMR_TARGET_WARM_RESET;
1708 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1709 tcm_function = TMR_TARGET_COLD_RESET;
1712 pr_err("Unknown iSCSI TMR Function:"
1713 " 0x%02x\n", function);
1714 return iscsit_add_reject_from_cmd(
1715 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1719 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1720 tcm_function, GFP_KERNEL);
1722 return iscsit_add_reject_from_cmd(
1723 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1726 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1729 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1730 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1731 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1732 cmd->init_task_tag = hdr->itt;
1733 cmd->targ_xfer_tag = 0xFFFFFFFF;
1734 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1735 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1736 se_tmr = cmd->se_cmd.se_tmr_req;
1737 tmr_req = cmd->tmr_req;
1739 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1741 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1742 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1743 scsilun_to_int(&hdr->lun));
1745 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1746 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1752 case ISCSI_TM_FUNC_ABORT_TASK:
1753 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1754 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1755 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1759 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1760 case ISCSI_TM_FUNC_CLEAR_ACA:
1761 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1762 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1764 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1765 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1766 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1767 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1771 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1772 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1773 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1774 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1778 case ISCSI_TM_FUNC_TASK_REASSIGN:
1779 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1781 * Perform sanity checks on the ExpDataSN only if the
1782 * TASK_REASSIGN was successful.
1784 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1787 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1788 return iscsit_add_reject_from_cmd(
1789 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1793 pr_err("Unknown TMR function: 0x%02x, protocol"
1794 " error.\n", function);
1795 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1796 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1800 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1801 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1802 se_tmr->call_transport = 1;
1804 spin_lock_bh(&conn->cmd_lock);
1805 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1806 spin_unlock_bh(&conn->cmd_lock);
1808 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1809 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1810 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1811 out_of_order_cmdsn = 1;
1812 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1814 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1815 return iscsit_add_reject_from_cmd(
1816 ISCSI_REASON_PROTOCOL_ERROR,
1819 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1821 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1824 * Found the referenced task, send to transport for processing.
1826 if (se_tmr->call_transport)
1827 return transport_generic_handle_tmr(&cmd->se_cmd);
1830 * Could not find the referenced LUN, task, or Task Management
1831 * command not authorized or supported. Change state and
1832 * let the tx_thread send the response.
1834 * For connection recovery, this is also the default action for
1835 * TMR TASK_REASSIGN.
1837 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1841 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1842 static int iscsit_handle_text_cmd(
1843 struct iscsi_conn *conn,
1846 char *text_ptr, *text_in;
1847 int cmdsn_ret, niov = 0, rx_got, rx_size;
1848 u32 checksum = 0, data_crc = 0, payload_length;
1849 u32 padding = 0, pad_bytes = 0, text_length = 0;
1850 struct iscsi_cmd *cmd;
1852 struct iscsi_text *hdr;
1854 hdr = (struct iscsi_text *) buf;
1855 payload_length = ntoh24(hdr->dlength);
1857 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1858 pr_err("Unable to accept text parameter length: %u"
1859 "greater than MaxXmitDataSegmentLength %u.\n",
1860 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1861 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1865 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1866 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1867 hdr->exp_statsn, payload_length);
1869 rx_size = text_length = payload_length;
1871 text_in = kzalloc(text_length, GFP_KERNEL);
1873 pr_err("Unable to allocate memory for"
1874 " incoming text parameters\n");
1878 memset(iov, 0, 3 * sizeof(struct kvec));
1879 iov[niov].iov_base = text_in;
1880 iov[niov++].iov_len = text_length;
1882 padding = ((-payload_length) & 3);
1884 iov[niov].iov_base = &pad_bytes;
1885 iov[niov++].iov_len = padding;
1887 pr_debug("Receiving %u additional bytes"
1888 " for padding.\n", padding);
1890 if (conn->conn_ops->DataDigest) {
1891 iov[niov].iov_base = &checksum;
1892 iov[niov++].iov_len = ISCSI_CRC_LEN;
1893 rx_size += ISCSI_CRC_LEN;
1896 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1897 if (rx_got != rx_size) {
1902 if (conn->conn_ops->DataDigest) {
1903 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1904 text_in, text_length,
1905 padding, (u8 *)&pad_bytes,
1908 if (checksum != data_crc) {
1909 pr_err("Text data CRC32C DataDigest"
1910 " 0x%08x does not match computed"
1911 " 0x%08x\n", checksum, data_crc);
1912 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1913 pr_err("Unable to recover from"
1914 " Text Data digest failure while in"
1920 * Silently drop this PDU and let the
1921 * initiator plug the CmdSN gap.
1923 pr_debug("Dropping Text"
1924 " Command CmdSN: 0x%08x due to"
1925 " DataCRC error.\n", hdr->cmdsn);
1930 pr_debug("Got CRC32C DataDigest"
1931 " 0x%08x for %u bytes of text data.\n",
1932 checksum, text_length);
1935 text_in[text_length - 1] = '\0';
1936 pr_debug("Successfully read %d bytes of text"
1937 " data.\n", text_length);
1939 if (strncmp("SendTargets", text_in, 11) != 0) {
1940 pr_err("Received Text Data that is not"
1941 " SendTargets, cannot continue.\n");
1945 text_ptr = strchr(text_in, '=');
1947 pr_err("No \"=\" separator found in Text Data,"
1948 " cannot continue.\n");
1952 if (strncmp("=All", text_ptr, 4) != 0) {
1953 pr_err("Unable to locate All value for"
1954 " SendTargets key, cannot continue.\n");
1958 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1962 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1964 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1967 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1968 cmd->i_state = ISTATE_SEND_TEXTRSP;
1969 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1970 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1971 cmd->targ_xfer_tag = 0xFFFFFFFF;
1972 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1973 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1974 cmd->data_direction = DMA_NONE;
1976 spin_lock_bh(&conn->cmd_lock);
1977 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1978 spin_unlock_bh(&conn->cmd_lock);
1980 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1982 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1983 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1984 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1985 return iscsit_add_reject_from_cmd(
1986 ISCSI_REASON_PROTOCOL_ERROR,
1992 return iscsit_execute_cmd(cmd, 0);
1995 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1997 struct iscsi_conn *conn_p;
1998 struct iscsi_session *sess = conn->sess;
2000 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2001 " for SID: %u.\n", conn->cid, conn->sess->sid);
2003 atomic_set(&sess->session_logout, 1);
2004 atomic_set(&conn->conn_logout_remove, 1);
2005 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2007 iscsit_inc_conn_usage_count(conn);
2008 iscsit_inc_session_usage_count(sess);
2010 spin_lock_bh(&sess->conn_lock);
2011 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2012 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2015 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2016 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2018 spin_unlock_bh(&sess->conn_lock);
2020 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2025 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2027 struct iscsi_conn *l_conn;
2028 struct iscsi_session *sess = conn->sess;
2030 pr_debug("Received logout request CLOSECONNECTION for CID:"
2031 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2034 * A Logout Request with a CLOSECONNECTION reason code for a CID
2035 * can arrive on a connection with a differing CID.
2037 if (conn->cid == cmd->logout_cid) {
2038 spin_lock_bh(&conn->state_lock);
2039 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2040 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2042 atomic_set(&conn->conn_logout_remove, 1);
2043 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2044 iscsit_inc_conn_usage_count(conn);
2046 spin_unlock_bh(&conn->state_lock);
2049 * Handle all different cid CLOSECONNECTION requests in
2050 * iscsit_logout_post_handler_diffcid() as to give enough
2051 * time for any non immediate command's CmdSN to be
2052 * acknowledged on the connection in question.
2054 * Here we simply make sure the CID is still around.
2056 l_conn = iscsit_get_conn_from_cid(sess,
2059 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2060 iscsit_add_cmd_to_response_queue(cmd, conn,
2065 iscsit_dec_conn_usage_count(l_conn);
2068 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2073 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2075 struct iscsi_session *sess = conn->sess;
2077 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2078 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2080 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2081 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2082 " while ERL!=2.\n");
2083 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2084 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2088 if (conn->cid == cmd->logout_cid) {
2089 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2090 " with CID: %hu on CID: %hu, implementation error.\n",
2091 cmd->logout_cid, conn->cid);
2092 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2093 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2097 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2102 static int iscsit_handle_logout_cmd(
2103 struct iscsi_conn *conn,
2106 int cmdsn_ret, logout_remove = 0;
2108 struct iscsi_cmd *cmd;
2109 struct iscsi_logout *hdr;
2110 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2112 hdr = (struct iscsi_logout *) buf;
2113 reason_code = (hdr->flags & 0x7f);
2116 spin_lock(&tiqn->logout_stats.lock);
2117 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2118 tiqn->logout_stats.normal_logouts++;
2120 tiqn->logout_stats.abnormal_logouts++;
2121 spin_unlock(&tiqn->logout_stats.lock);
2124 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2125 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2126 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2127 hdr->cid, conn->cid);
2129 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2130 pr_err("Received logout request on connection that"
2131 " is not in logged in state, ignoring request.\n");
2135 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2137 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2140 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2141 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2142 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2143 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2144 cmd->targ_xfer_tag = 0xFFFFFFFF;
2145 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2146 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2147 cmd->logout_cid = be16_to_cpu(hdr->cid);
2148 cmd->logout_reason = reason_code;
2149 cmd->data_direction = DMA_NONE;
2152 * We need to sleep in these cases (by returning 1) until the Logout
2153 * Response gets sent in the tx thread.
2155 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2156 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2157 be16_to_cpu(hdr->cid) == conn->cid))
2160 spin_lock_bh(&conn->cmd_lock);
2161 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2162 spin_unlock_bh(&conn->cmd_lock);
2164 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2165 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2168 * Immediate commands are executed, well, immediately.
2169 * Non-Immediate Logout Commands are executed in CmdSN order.
2171 if (cmd->immediate_cmd) {
2172 int ret = iscsit_execute_cmd(cmd, 0);
2177 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2178 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2180 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2181 return iscsit_add_reject_from_cmd(
2182 ISCSI_REASON_PROTOCOL_ERROR,
2187 return logout_remove;
2190 static int iscsit_handle_snack(
2191 struct iscsi_conn *conn,
2194 struct iscsi_snack *hdr;
2196 hdr = (struct iscsi_snack *) buf;
2197 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2199 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2200 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2201 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2202 hdr->begrun, hdr->runlength, conn->cid);
2204 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2205 pr_err("Initiator sent SNACK request while in"
2206 " ErrorRecoveryLevel=0.\n");
2207 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2211 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2212 * call from inside iscsi_send_recovery_datain_or_r2t().
2214 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2216 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2218 be32_to_cpu(hdr->ttt),
2219 be32_to_cpu(hdr->begrun),
2220 be32_to_cpu(hdr->runlength));
2221 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2222 return iscsit_handle_status_snack(conn, hdr->itt,
2223 be32_to_cpu(hdr->ttt),
2224 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2225 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2226 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2227 be32_to_cpu(hdr->begrun),
2228 be32_to_cpu(hdr->runlength));
2229 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2230 /* FIXME: Support R-Data SNACK */
2231 pr_err("R-Data SNACK Not Supported.\n");
2232 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2235 pr_err("Unknown SNACK type 0x%02x, protocol"
2236 " error.\n", hdr->flags & 0x0f);
2237 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2244 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2246 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2247 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2248 wait_for_completion_interruptible_timeout(
2249 &conn->rx_half_close_comp,
2250 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2254 static int iscsit_handle_immediate_data(
2255 struct iscsi_cmd *cmd,
2259 int iov_ret, rx_got = 0, rx_size = 0;
2260 u32 checksum, iov_count = 0, padding = 0;
2261 struct iscsi_conn *conn = cmd->conn;
2264 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2266 return IMMEDIATE_DATA_CANNOT_RECOVER;
2269 iov_count = iov_ret;
2270 iov = &cmd->iov_data[0];
2272 padding = ((-length) & 3);
2274 iov[iov_count].iov_base = cmd->pad_bytes;
2275 iov[iov_count++].iov_len = padding;
2279 if (conn->conn_ops->DataDigest) {
2280 iov[iov_count].iov_base = &checksum;
2281 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2282 rx_size += ISCSI_CRC_LEN;
2285 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2287 iscsit_unmap_iovec(cmd);
2289 if (rx_got != rx_size) {
2290 iscsit_rx_thread_wait_for_tcp(conn);
2291 return IMMEDIATE_DATA_CANNOT_RECOVER;
2294 if (conn->conn_ops->DataDigest) {
2297 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2298 cmd->write_data_done, length, padding,
2301 if (checksum != data_crc) {
2302 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2303 " does not match computed 0x%08x\n", checksum,
2306 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2307 pr_err("Unable to recover from"
2308 " Immediate Data digest failure while"
2310 iscsit_add_reject_from_cmd(
2311 ISCSI_REASON_DATA_DIGEST_ERROR,
2313 return IMMEDIATE_DATA_CANNOT_RECOVER;
2315 iscsit_add_reject_from_cmd(
2316 ISCSI_REASON_DATA_DIGEST_ERROR,
2318 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2321 pr_debug("Got CRC32C DataDigest 0x%08x for"
2322 " %u bytes of Immediate Data\n", checksum,
2327 cmd->write_data_done += length;
2329 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2330 spin_lock_bh(&cmd->istate_lock);
2331 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2332 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2333 spin_unlock_bh(&cmd->istate_lock);
2336 return IMMEDIATE_DATA_NORMAL_OPERATION;
2340 * Called with sess->conn_lock held.
2342 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2343 with active network interface */
2344 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2346 struct iscsi_cmd *cmd;
2347 struct iscsi_conn *conn_p;
2350 * Only send a Asynchronous Message on connections whos network
2351 * interface is still functional.
2353 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2354 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2355 iscsit_inc_conn_usage_count(conn_p);
2363 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2365 iscsit_dec_conn_usage_count(conn_p);
2369 cmd->logout_cid = conn->cid;
2370 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2371 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2373 spin_lock_bh(&conn_p->cmd_lock);
2374 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2375 spin_unlock_bh(&conn_p->cmd_lock);
2377 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2378 iscsit_dec_conn_usage_count(conn_p);
2381 static int iscsit_send_conn_drop_async_message(
2382 struct iscsi_cmd *cmd,
2383 struct iscsi_conn *conn)
2385 struct iscsi_async *hdr;
2387 cmd->tx_size = ISCSI_HDR_LEN;
2388 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2390 hdr = (struct iscsi_async *) cmd->pdu;
2391 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2392 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2393 cmd->init_task_tag = RESERVED_ITT;
2394 cmd->targ_xfer_tag = 0xFFFFFFFF;
2395 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2396 cmd->stat_sn = conn->stat_sn++;
2397 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2398 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2399 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2400 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2401 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2402 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2403 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2405 if (conn->conn_ops->HeaderDigest) {
2406 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2408 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2409 (unsigned char *)hdr, ISCSI_HDR_LEN,
2410 0, NULL, (u8 *)header_digest);
2412 cmd->tx_size += ISCSI_CRC_LEN;
2413 pr_debug("Attaching CRC32C HeaderDigest to"
2414 " Async Message 0x%08x\n", *header_digest);
2417 cmd->iov_misc[0].iov_base = cmd->pdu;
2418 cmd->iov_misc[0].iov_len = cmd->tx_size;
2419 cmd->iov_misc_count = 1;
2421 pr_debug("Sending Connection Dropped Async Message StatSN:"
2422 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2423 cmd->logout_cid, conn->cid);
2427 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2429 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2430 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2431 wait_for_completion_interruptible_timeout(
2432 &conn->tx_half_close_comp,
2433 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2437 static int iscsit_send_data_in(
2438 struct iscsi_cmd *cmd,
2439 struct iscsi_conn *conn)
2441 int iov_ret = 0, set_statsn = 0;
2442 u32 iov_count = 0, tx_size = 0;
2443 struct iscsi_datain datain;
2444 struct iscsi_datain_req *dr;
2445 struct iscsi_data_rsp *hdr;
2450 memset(&datain, 0, sizeof(struct iscsi_datain));
2451 dr = iscsit_get_datain_values(cmd, &datain);
2453 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2454 cmd->init_task_tag);
2459 * Be paranoid and double check the logic for now.
2461 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2462 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2463 " datain.length: %u exceeds cmd->data_length: %u\n",
2464 cmd->init_task_tag, datain.offset, datain.length,
2465 cmd->se_cmd.data_length);
2469 spin_lock_bh(&conn->sess->session_stats_lock);
2470 conn->sess->tx_data_octets += datain.length;
2471 if (conn->sess->se_sess->se_node_acl) {
2472 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2473 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2474 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2476 spin_unlock_bh(&conn->sess->session_stats_lock);
2478 * Special case for successfully execution w/ both DATAIN
2481 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2482 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2483 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2485 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2486 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2487 iscsit_increment_maxcmdsn(cmd, conn->sess);
2488 cmd->stat_sn = conn->stat_sn++;
2490 } else if (dr->dr_complete ==
2491 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2495 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2496 memset(hdr, 0, ISCSI_HDR_LEN);
2497 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2498 hdr->flags = datain.flags;
2499 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2500 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2501 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2502 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2503 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2504 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2505 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2508 hton24(hdr->dlength, datain.length);
2509 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2510 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2511 (struct scsi_lun *)&hdr->lun);
2513 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2515 hdr->itt = cmd->init_task_tag;
2517 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2518 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2520 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2522 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2524 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2526 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2527 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2528 hdr->datasn = cpu_to_be32(datain.data_sn);
2529 hdr->offset = cpu_to_be32(datain.offset);
2531 iov = &cmd->iov_data[0];
2532 iov[iov_count].iov_base = cmd->pdu;
2533 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2534 tx_size += ISCSI_HDR_LEN;
2536 if (conn->conn_ops->HeaderDigest) {
2537 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2539 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2540 (unsigned char *)hdr, ISCSI_HDR_LEN,
2541 0, NULL, (u8 *)header_digest);
2543 iov[0].iov_len += ISCSI_CRC_LEN;
2544 tx_size += ISCSI_CRC_LEN;
2546 pr_debug("Attaching CRC32 HeaderDigest"
2547 " for DataIN PDU 0x%08x\n", *header_digest);
2550 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2554 iov_count += iov_ret;
2555 tx_size += datain.length;
2557 cmd->padding = ((-datain.length) & 3);
2559 iov[iov_count].iov_base = cmd->pad_bytes;
2560 iov[iov_count++].iov_len = cmd->padding;
2561 tx_size += cmd->padding;
2563 pr_debug("Attaching %u padding bytes\n",
2566 if (conn->conn_ops->DataDigest) {
2567 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2568 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2570 iov[iov_count].iov_base = &cmd->data_crc;
2571 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2572 tx_size += ISCSI_CRC_LEN;
2574 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2575 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2578 cmd->iov_data_count = iov_count;
2579 cmd->tx_size = tx_size;
2581 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2582 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2583 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2584 ntohl(hdr->offset), datain.length, conn->cid);
2586 /* sendpage is preferred but can't insert markers */
2587 if (!conn->conn_ops->IFMarker)
2588 ret = iscsit_fe_sendpage_sg(cmd, conn);
2590 ret = iscsit_send_tx_data(cmd, conn, 0);
2592 iscsit_unmap_iovec(cmd);
2595 iscsit_tx_thread_wait_for_tcp(conn);
2599 if (dr->dr_complete) {
2600 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2602 iscsit_free_datain_req(cmd, dr);
2608 static int iscsit_send_logout_response(
2609 struct iscsi_cmd *cmd,
2610 struct iscsi_conn *conn)
2612 int niov = 0, tx_size;
2613 struct iscsi_conn *logout_conn = NULL;
2614 struct iscsi_conn_recovery *cr = NULL;
2615 struct iscsi_session *sess = conn->sess;
2617 struct iscsi_logout_rsp *hdr;
2619 * The actual shutting down of Sessions and/or Connections
2620 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2621 * is done in scsi_logout_post_handler().
2623 switch (cmd->logout_reason) {
2624 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2625 pr_debug("iSCSI session logout successful, setting"
2626 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2627 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2629 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2630 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2633 * For CLOSECONNECTION logout requests carrying
2634 * a matching logout CID -> local CID, the reference
2635 * for the local CID will have been incremented in
2636 * iscsi_logout_closeconnection().
2638 * For CLOSECONNECTION logout requests carrying
2639 * a different CID than the connection it arrived
2640 * on, the connection responding to cmd->logout_cid
2641 * is stopped in iscsit_logout_post_handler_diffcid().
2644 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2645 " successful.\n", cmd->logout_cid, conn->cid);
2646 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2648 case ISCSI_LOGOUT_REASON_RECOVERY:
2649 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2650 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2653 * If the connection is still active from our point of view
2654 * force connection recovery to occur.
2656 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2659 iscsit_connection_reinstatement_rcfr(logout_conn);
2660 iscsit_dec_conn_usage_count(logout_conn);
2663 cr = iscsit_get_inactive_connection_recovery_entry(
2664 conn->sess, cmd->logout_cid);
2666 pr_err("Unable to locate CID: %hu for"
2667 " REMOVECONNFORRECOVERY Logout Request.\n",
2669 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2673 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2675 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2676 " for recovery for CID: %hu on CID: %hu successful.\n",
2677 cmd->logout_cid, conn->cid);
2678 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2681 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2682 cmd->logout_reason);
2686 tx_size = ISCSI_HDR_LEN;
2687 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2688 memset(hdr, 0, ISCSI_HDR_LEN);
2689 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2690 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2691 hdr->response = cmd->logout_response;
2692 hdr->itt = cmd->init_task_tag;
2693 cmd->stat_sn = conn->stat_sn++;
2694 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2696 iscsit_increment_maxcmdsn(cmd, conn->sess);
2697 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2698 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2700 iov = &cmd->iov_misc[0];
2701 iov[niov].iov_base = cmd->pdu;
2702 iov[niov++].iov_len = ISCSI_HDR_LEN;
2704 if (conn->conn_ops->HeaderDigest) {
2705 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2707 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2708 (unsigned char *)hdr, ISCSI_HDR_LEN,
2709 0, NULL, (u8 *)header_digest);
2711 iov[0].iov_len += ISCSI_CRC_LEN;
2712 tx_size += ISCSI_CRC_LEN;
2713 pr_debug("Attaching CRC32C HeaderDigest to"
2714 " Logout Response 0x%08x\n", *header_digest);
2716 cmd->iov_misc_count = niov;
2717 cmd->tx_size = tx_size;
2719 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2720 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2721 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2722 cmd->logout_cid, conn->cid);
2728 * Unsolicited NOPIN, either requesting a response or not.
2730 static int iscsit_send_unsolicited_nopin(
2731 struct iscsi_cmd *cmd,
2732 struct iscsi_conn *conn,
2735 int tx_size = ISCSI_HDR_LEN;
2736 struct iscsi_nopin *hdr;
2739 hdr = (struct iscsi_nopin *) cmd->pdu;
2740 memset(hdr, 0, ISCSI_HDR_LEN);
2741 hdr->opcode = ISCSI_OP_NOOP_IN;
2742 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2743 hdr->itt = cmd->init_task_tag;
2744 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2745 cmd->stat_sn = conn->stat_sn;
2746 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2747 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2748 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2750 if (conn->conn_ops->HeaderDigest) {
2751 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2753 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2754 (unsigned char *)hdr, ISCSI_HDR_LEN,
2755 0, NULL, (u8 *)header_digest);
2757 tx_size += ISCSI_CRC_LEN;
2758 pr_debug("Attaching CRC32C HeaderDigest to"
2759 " NopIN 0x%08x\n", *header_digest);
2762 cmd->iov_misc[0].iov_base = cmd->pdu;
2763 cmd->iov_misc[0].iov_len = tx_size;
2764 cmd->iov_misc_count = 1;
2765 cmd->tx_size = tx_size;
2767 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2768 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2770 ret = iscsit_send_tx_data(cmd, conn, 1);
2772 iscsit_tx_thread_wait_for_tcp(conn);
2776 spin_lock_bh(&cmd->istate_lock);
2777 cmd->i_state = want_response ?
2778 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2779 spin_unlock_bh(&cmd->istate_lock);
2784 static int iscsit_send_nopin_response(
2785 struct iscsi_cmd *cmd,
2786 struct iscsi_conn *conn)
2788 int niov = 0, tx_size;
2791 struct iscsi_nopin *hdr;
2793 tx_size = ISCSI_HDR_LEN;
2794 hdr = (struct iscsi_nopin *) cmd->pdu;
2795 memset(hdr, 0, ISCSI_HDR_LEN);
2796 hdr->opcode = ISCSI_OP_NOOP_IN;
2797 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2798 hton24(hdr->dlength, cmd->buf_ptr_size);
2799 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2800 hdr->itt = cmd->init_task_tag;
2801 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2802 cmd->stat_sn = conn->stat_sn++;
2803 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2805 iscsit_increment_maxcmdsn(cmd, conn->sess);
2806 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2807 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2809 iov = &cmd->iov_misc[0];
2810 iov[niov].iov_base = cmd->pdu;
2811 iov[niov++].iov_len = ISCSI_HDR_LEN;
2813 if (conn->conn_ops->HeaderDigest) {
2814 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2816 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2817 (unsigned char *)hdr, ISCSI_HDR_LEN,
2818 0, NULL, (u8 *)header_digest);
2820 iov[0].iov_len += ISCSI_CRC_LEN;
2821 tx_size += ISCSI_CRC_LEN;
2822 pr_debug("Attaching CRC32C HeaderDigest"
2823 " to NopIn 0x%08x\n", *header_digest);
2827 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2828 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2830 if (cmd->buf_ptr_size) {
2831 iov[niov].iov_base = cmd->buf_ptr;
2832 iov[niov++].iov_len = cmd->buf_ptr_size;
2833 tx_size += cmd->buf_ptr_size;
2835 pr_debug("Echoing back %u bytes of ping"
2836 " data.\n", cmd->buf_ptr_size);
2838 padding = ((-cmd->buf_ptr_size) & 3);
2840 iov[niov].iov_base = &cmd->pad_bytes;
2841 iov[niov++].iov_len = padding;
2843 pr_debug("Attaching %u additional"
2844 " padding bytes.\n", padding);
2846 if (conn->conn_ops->DataDigest) {
2847 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2848 cmd->buf_ptr, cmd->buf_ptr_size,
2849 padding, (u8 *)&cmd->pad_bytes,
2850 (u8 *)&cmd->data_crc);
2852 iov[niov].iov_base = &cmd->data_crc;
2853 iov[niov++].iov_len = ISCSI_CRC_LEN;
2854 tx_size += ISCSI_CRC_LEN;
2855 pr_debug("Attached DataDigest for %u"
2856 " bytes of ping data, CRC 0x%08x\n",
2857 cmd->buf_ptr_size, cmd->data_crc);
2861 cmd->iov_misc_count = niov;
2862 cmd->tx_size = tx_size;
2864 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2865 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2866 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2871 static int iscsit_send_r2t(
2872 struct iscsi_cmd *cmd,
2873 struct iscsi_conn *conn)
2876 struct iscsi_r2t *r2t;
2877 struct iscsi_r2t_rsp *hdr;
2880 r2t = iscsit_get_r2t_from_list(cmd);
2884 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2885 memset(hdr, 0, ISCSI_HDR_LEN);
2886 hdr->opcode = ISCSI_OP_R2T;
2887 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2888 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2889 (struct scsi_lun *)&hdr->lun);
2890 hdr->itt = cmd->init_task_tag;
2891 spin_lock_bh(&conn->sess->ttt_lock);
2892 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2893 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2894 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2895 spin_unlock_bh(&conn->sess->ttt_lock);
2896 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2897 hdr->statsn = cpu_to_be32(conn->stat_sn);
2898 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2899 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2900 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2901 hdr->data_offset = cpu_to_be32(r2t->offset);
2902 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2904 cmd->iov_misc[0].iov_base = cmd->pdu;
2905 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2906 tx_size += ISCSI_HDR_LEN;
2908 if (conn->conn_ops->HeaderDigest) {
2909 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2911 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2912 (unsigned char *)hdr, ISCSI_HDR_LEN,
2913 0, NULL, (u8 *)header_digest);
2915 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2916 tx_size += ISCSI_CRC_LEN;
2917 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2918 " PDU 0x%08x\n", *header_digest);
2921 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2922 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2923 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2924 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2925 r2t->offset, r2t->xfer_len, conn->cid);
2927 cmd->iov_misc_count = 1;
2928 cmd->tx_size = tx_size;
2930 spin_lock_bh(&cmd->r2t_lock);
2932 spin_unlock_bh(&cmd->r2t_lock);
2934 ret = iscsit_send_tx_data(cmd, conn, 1);
2936 iscsit_tx_thread_wait_for_tcp(conn);
2940 spin_lock_bh(&cmd->dataout_timeout_lock);
2941 iscsit_start_dataout_timer(cmd, conn);
2942 spin_unlock_bh(&cmd->dataout_timeout_lock);
2948 * @recovery: If called from iscsi_task_reassign_complete_write() for
2949 * connection recovery.
2951 int iscsit_build_r2ts_for_cmd(
2952 struct iscsi_cmd *cmd,
2953 struct iscsi_conn *conn,
2957 u32 offset = 0, xfer_len = 0;
2959 spin_lock_bh(&cmd->r2t_lock);
2960 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2961 spin_unlock_bh(&cmd->r2t_lock);
2965 if (conn->sess->sess_ops->DataSequenceInOrder &&
2967 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2969 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2970 if (conn->sess->sess_ops->DataSequenceInOrder) {
2971 offset = cmd->r2t_offset;
2973 if (first_r2t && recovery) {
2974 int new_data_end = offset +
2975 conn->sess->sess_ops->MaxBurstLength -
2976 cmd->next_burst_len;
2978 if (new_data_end > cmd->se_cmd.data_length)
2979 xfer_len = cmd->se_cmd.data_length - offset;
2982 conn->sess->sess_ops->MaxBurstLength -
2983 cmd->next_burst_len;
2985 int new_data_end = offset +
2986 conn->sess->sess_ops->MaxBurstLength;
2988 if (new_data_end > cmd->se_cmd.data_length)
2989 xfer_len = cmd->se_cmd.data_length - offset;
2991 xfer_len = conn->sess->sess_ops->MaxBurstLength;
2993 cmd->r2t_offset += xfer_len;
2995 if (cmd->r2t_offset == cmd->se_cmd.data_length)
2996 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2998 struct iscsi_seq *seq;
3000 seq = iscsit_get_seq_holder_for_r2t(cmd);
3002 spin_unlock_bh(&cmd->r2t_lock);
3006 offset = seq->offset;
3007 xfer_len = seq->xfer_len;
3009 if (cmd->seq_send_order == cmd->seq_count)
3010 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3012 cmd->outstanding_r2ts++;
3015 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3016 spin_unlock_bh(&cmd->r2t_lock);
3020 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3023 spin_unlock_bh(&cmd->r2t_lock);
3028 static int iscsit_send_status(
3029 struct iscsi_cmd *cmd,
3030 struct iscsi_conn *conn)
3032 u8 iov_count = 0, recovery;
3033 u32 padding = 0, tx_size = 0;
3034 struct iscsi_scsi_rsp *hdr;
3037 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3039 cmd->stat_sn = conn->stat_sn++;
3041 spin_lock_bh(&conn->sess->session_stats_lock);
3042 conn->sess->rsp_pdus++;
3043 spin_unlock_bh(&conn->sess->session_stats_lock);
3045 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3046 memset(hdr, 0, ISCSI_HDR_LEN);
3047 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3048 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3049 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3050 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3051 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3052 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3053 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3054 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3056 hdr->response = cmd->iscsi_response;
3057 hdr->cmd_status = cmd->se_cmd.scsi_status;
3058 hdr->itt = cmd->init_task_tag;
3059 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3061 iscsit_increment_maxcmdsn(cmd, conn->sess);
3062 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3063 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3065 iov = &cmd->iov_misc[0];
3066 iov[iov_count].iov_base = cmd->pdu;
3067 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3068 tx_size += ISCSI_HDR_LEN;
3071 * Attach SENSE DATA payload to iSCSI Response PDU
3073 if (cmd->se_cmd.sense_buffer &&
3074 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3075 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3076 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3077 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3079 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3080 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3081 iov[iov_count].iov_base = cmd->sense_buffer;
3082 iov[iov_count++].iov_len =
3083 (cmd->se_cmd.scsi_sense_length + padding);
3084 tx_size += cmd->se_cmd.scsi_sense_length;
3087 memset(cmd->sense_buffer +
3088 cmd->se_cmd.scsi_sense_length, 0, padding);
3090 pr_debug("Adding %u bytes of padding to"
3091 " SENSE.\n", padding);
3094 if (conn->conn_ops->DataDigest) {
3095 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3097 (cmd->se_cmd.scsi_sense_length + padding),
3098 0, NULL, (u8 *)&cmd->data_crc);
3100 iov[iov_count].iov_base = &cmd->data_crc;
3101 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3102 tx_size += ISCSI_CRC_LEN;
3104 pr_debug("Attaching CRC32 DataDigest for"
3105 " SENSE, %u bytes CRC 0x%08x\n",
3106 (cmd->se_cmd.scsi_sense_length + padding),
3110 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3112 cmd->se_cmd.scsi_sense_length);
3115 if (conn->conn_ops->HeaderDigest) {
3116 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3118 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3119 (unsigned char *)hdr, ISCSI_HDR_LEN,
3120 0, NULL, (u8 *)header_digest);
3122 iov[0].iov_len += ISCSI_CRC_LEN;
3123 tx_size += ISCSI_CRC_LEN;
3124 pr_debug("Attaching CRC32 HeaderDigest for Response"
3125 " PDU 0x%08x\n", *header_digest);
3128 cmd->iov_misc_count = iov_count;
3129 cmd->tx_size = tx_size;
3131 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3132 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3133 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3134 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3139 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3141 switch (se_tmr->response) {
3142 case TMR_FUNCTION_COMPLETE:
3143 return ISCSI_TMF_RSP_COMPLETE;
3144 case TMR_TASK_DOES_NOT_EXIST:
3145 return ISCSI_TMF_RSP_NO_TASK;
3146 case TMR_LUN_DOES_NOT_EXIST:
3147 return ISCSI_TMF_RSP_NO_LUN;
3148 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3149 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3150 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3151 return ISCSI_TMF_RSP_AUTH_FAILED;
3152 case TMR_FUNCTION_REJECTED:
3154 return ISCSI_TMF_RSP_REJECTED;
3158 static int iscsit_send_task_mgt_rsp(
3159 struct iscsi_cmd *cmd,
3160 struct iscsi_conn *conn)
3162 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3163 struct iscsi_tm_rsp *hdr;
3166 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3167 memset(hdr, 0, ISCSI_HDR_LEN);
3168 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3169 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3170 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3171 hdr->itt = cmd->init_task_tag;
3172 cmd->stat_sn = conn->stat_sn++;
3173 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3175 iscsit_increment_maxcmdsn(cmd, conn->sess);
3176 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3177 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3179 cmd->iov_misc[0].iov_base = cmd->pdu;
3180 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3181 tx_size += ISCSI_HDR_LEN;
3183 if (conn->conn_ops->HeaderDigest) {
3184 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3186 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3187 (unsigned char *)hdr, ISCSI_HDR_LEN,
3188 0, NULL, (u8 *)header_digest);
3190 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3191 tx_size += ISCSI_CRC_LEN;
3192 pr_debug("Attaching CRC32 HeaderDigest for Task"
3193 " Mgmt Response PDU 0x%08x\n", *header_digest);
3196 cmd->iov_misc_count = 1;
3197 cmd->tx_size = tx_size;
3199 pr_debug("Built Task Management Response ITT: 0x%08x,"
3200 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3201 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3206 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3210 if (np->np_sockaddr.ss_family == AF_INET6) {
3211 const struct sockaddr_in6 sin6 = {
3212 .sin6_addr = IN6ADDR_ANY_INIT };
3213 struct sockaddr_in6 *sock_in6 =
3214 (struct sockaddr_in6 *)&np->np_sockaddr;
3216 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3217 sin6.sin6_addr.s6_addr, 16))
3220 struct sockaddr_in * sock_in =
3221 (struct sockaddr_in *)&np->np_sockaddr;
3223 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3230 #define SENDTARGETS_BUF_LIMIT 32768U
3232 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3234 char *payload = NULL;
3235 struct iscsi_conn *conn = cmd->conn;
3236 struct iscsi_portal_group *tpg;
3237 struct iscsi_tiqn *tiqn;
3238 struct iscsi_tpg_np *tpg_np;
3239 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3240 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3242 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3243 SENDTARGETS_BUF_LIMIT);
3245 payload = kzalloc(buffer_len, GFP_KERNEL);
3247 pr_err("Unable to allocate memory for sendtargets"
3252 spin_lock(&tiqn_lock);
3253 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3254 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3257 if ((len + payload_len) > buffer_len) {
3261 memcpy(payload + payload_len, buf, len);
3264 spin_lock(&tiqn->tiqn_tpg_lock);
3265 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3267 spin_lock(&tpg->tpg_state_lock);
3268 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3269 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3270 spin_unlock(&tpg->tpg_state_lock);
3273 spin_unlock(&tpg->tpg_state_lock);
3275 spin_lock(&tpg->tpg_np_lock);
3276 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3278 struct iscsi_np *np = tpg_np->tpg_np;
3279 bool inaddr_any = iscsit_check_inaddr_any(np);
3281 len = sprintf(buf, "TargetAddress="
3283 (np->np_sockaddr.ss_family == AF_INET6) ?
3284 "[" : "", (inaddr_any == false) ?
3285 np->np_ip : conn->local_ip,
3286 (np->np_sockaddr.ss_family == AF_INET6) ?
3287 "]" : "", (inaddr_any == false) ?
3288 np->np_port : conn->local_port,
3292 if ((len + payload_len) > buffer_len) {
3293 spin_unlock(&tpg->tpg_np_lock);
3294 spin_unlock(&tiqn->tiqn_tpg_lock);
3298 memcpy(payload + payload_len, buf, len);
3301 spin_unlock(&tpg->tpg_np_lock);
3303 spin_unlock(&tiqn->tiqn_tpg_lock);
3308 spin_unlock(&tiqn_lock);
3310 cmd->buf_ptr = payload;
3316 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3317 * MaxRecvDataSegmentLength.
3319 static int iscsit_send_text_rsp(
3320 struct iscsi_cmd *cmd,
3321 struct iscsi_conn *conn)
3323 struct iscsi_text_rsp *hdr;
3325 u32 padding = 0, tx_size = 0;
3326 int text_length, iov_count = 0;
3328 text_length = iscsit_build_sendtargets_response(cmd);
3329 if (text_length < 0)
3332 padding = ((-text_length) & 3);
3334 memset(cmd->buf_ptr + text_length, 0, padding);
3335 pr_debug("Attaching %u additional bytes for"
3336 " padding.\n", padding);
3339 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3340 memset(hdr, 0, ISCSI_HDR_LEN);
3341 hdr->opcode = ISCSI_OP_TEXT_RSP;
3342 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3343 hton24(hdr->dlength, text_length);
3344 hdr->itt = cmd->init_task_tag;
3345 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3346 cmd->stat_sn = conn->stat_sn++;
3347 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3349 iscsit_increment_maxcmdsn(cmd, conn->sess);
3350 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3351 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3353 iov = &cmd->iov_misc[0];
3355 iov[iov_count].iov_base = cmd->pdu;
3356 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3357 iov[iov_count].iov_base = cmd->buf_ptr;
3358 iov[iov_count++].iov_len = text_length + padding;
3360 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3362 if (conn->conn_ops->HeaderDigest) {
3363 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3365 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3366 (unsigned char *)hdr, ISCSI_HDR_LEN,
3367 0, NULL, (u8 *)header_digest);
3369 iov[0].iov_len += ISCSI_CRC_LEN;
3370 tx_size += ISCSI_CRC_LEN;
3371 pr_debug("Attaching CRC32 HeaderDigest for"
3372 " Text Response PDU 0x%08x\n", *header_digest);
3375 if (conn->conn_ops->DataDigest) {
3376 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3377 cmd->buf_ptr, (text_length + padding),
3378 0, NULL, (u8 *)&cmd->data_crc);
3380 iov[iov_count].iov_base = &cmd->data_crc;
3381 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3382 tx_size += ISCSI_CRC_LEN;
3384 pr_debug("Attaching DataDigest for %u bytes of text"
3385 " data, CRC 0x%08x\n", (text_length + padding),
3389 cmd->iov_misc_count = iov_count;
3390 cmd->tx_size = tx_size;
3392 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3393 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3394 text_length, conn->cid);
3398 static int iscsit_send_reject(
3399 struct iscsi_cmd *cmd,
3400 struct iscsi_conn *conn)
3402 u32 iov_count = 0, tx_size = 0;
3403 struct iscsi_reject *hdr;
3406 hdr = (struct iscsi_reject *) cmd->pdu;
3407 hdr->opcode = ISCSI_OP_REJECT;
3408 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3409 hton24(hdr->dlength, ISCSI_HDR_LEN);
3410 hdr->ffffffff = cpu_to_be32(0xffffffff);
3411 cmd->stat_sn = conn->stat_sn++;
3412 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3413 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3414 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3416 iov = &cmd->iov_misc[0];
3418 iov[iov_count].iov_base = cmd->pdu;
3419 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3420 iov[iov_count].iov_base = cmd->buf_ptr;
3421 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3423 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3425 if (conn->conn_ops->HeaderDigest) {
3426 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3428 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3429 (unsigned char *)hdr, ISCSI_HDR_LEN,
3430 0, NULL, (u8 *)header_digest);
3432 iov[0].iov_len += ISCSI_CRC_LEN;
3433 tx_size += ISCSI_CRC_LEN;
3434 pr_debug("Attaching CRC32 HeaderDigest for"
3435 " REJECT PDU 0x%08x\n", *header_digest);
3438 if (conn->conn_ops->DataDigest) {
3439 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3440 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3441 0, NULL, (u8 *)&cmd->data_crc);
3443 iov[iov_count].iov_base = &cmd->data_crc;
3444 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3445 tx_size += ISCSI_CRC_LEN;
3446 pr_debug("Attaching CRC32 DataDigest for REJECT"
3447 " PDU 0x%08x\n", cmd->data_crc);
3450 cmd->iov_misc_count = iov_count;
3451 cmd->tx_size = tx_size;
3453 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3454 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3459 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3461 struct iscsi_thread_set *ts = conn->thread_set;
3464 * thread_id is assigned from iscsit_global->ts_bitmap from
3465 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3467 * Here we use thread_id to determine which CPU that this
3468 * iSCSI connection's iscsi_thread_set will be scheduled to
3471 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3472 for_each_online_cpu(cpu) {
3474 cpumask_set_cpu(cpu, conn->conn_cpumask);
3479 * This should never be reached..
3482 cpumask_setall(conn->conn_cpumask);
3485 static inline void iscsit_thread_check_cpumask(
3486 struct iscsi_conn *conn,
3487 struct task_struct *p,
3492 * mode == 1 signals iscsi_target_tx_thread() usage.
3493 * mode == 0 signals iscsi_target_rx_thread() usage.
3496 if (!conn->conn_tx_reset_cpumask)
3498 conn->conn_tx_reset_cpumask = 0;
3500 if (!conn->conn_rx_reset_cpumask)
3502 conn->conn_rx_reset_cpumask = 0;
3505 * Update the CPU mask for this single kthread so that
3506 * both TX and RX kthreads are scheduled to run on the
3509 memset(buf, 0, 128);
3510 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3511 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3514 static int handle_immediate_queue(struct iscsi_conn *conn)
3516 struct iscsi_queue_req *qr;
3517 struct iscsi_cmd *cmd;
3521 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3522 atomic_set(&conn->check_immediate_queue, 0);
3525 kmem_cache_free(lio_qr_cache, qr);
3528 case ISTATE_SEND_R2T:
3529 ret = iscsit_send_r2t(cmd, conn);
3534 if (cmd->data_direction == DMA_TO_DEVICE)
3535 iscsit_stop_dataout_timer(cmd);
3537 spin_lock_bh(&conn->cmd_lock);
3538 list_del(&cmd->i_conn_node);
3539 spin_unlock_bh(&conn->cmd_lock);
3541 iscsit_free_cmd(cmd);
3543 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3544 iscsit_mod_nopin_response_timer(conn);
3545 ret = iscsit_send_unsolicited_nopin(cmd,
3550 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3551 ret = iscsit_send_unsolicited_nopin(cmd,
3557 pr_err("Unknown Opcode: 0x%02x ITT:"
3558 " 0x%08x, i_state: %d on CID: %hu\n",
3559 cmd->iscsi_opcode, cmd->init_task_tag, state,
3571 static int handle_response_queue(struct iscsi_conn *conn)
3573 struct iscsi_queue_req *qr;
3574 struct iscsi_cmd *cmd;
3578 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3581 kmem_cache_free(lio_qr_cache, qr);
3585 case ISTATE_SEND_DATAIN:
3586 ret = iscsit_send_data_in(cmd, conn);
3591 goto check_rsp_state;
3592 else if (ret == 1) {
3594 spin_lock_bh(&cmd->istate_lock);
3595 cmd->i_state = ISTATE_SENT_STATUS;
3596 spin_unlock_bh(&cmd->istate_lock);
3598 } else if (ret == 2) {
3599 /* Still must send status,
3600 SCF_TRANSPORT_TASK_SENSE was set */
3601 spin_lock_bh(&cmd->istate_lock);
3602 cmd->i_state = ISTATE_SEND_STATUS;
3603 spin_unlock_bh(&cmd->istate_lock);
3604 state = ISTATE_SEND_STATUS;
3605 goto check_rsp_state;
3609 case ISTATE_SEND_STATUS:
3610 case ISTATE_SEND_STATUS_RECOVERY:
3611 ret = iscsit_send_status(cmd, conn);
3613 case ISTATE_SEND_LOGOUTRSP:
3614 ret = iscsit_send_logout_response(cmd, conn);
3616 case ISTATE_SEND_ASYNCMSG:
3617 ret = iscsit_send_conn_drop_async_message(
3620 case ISTATE_SEND_NOPIN:
3621 ret = iscsit_send_nopin_response(cmd, conn);
3623 case ISTATE_SEND_REJECT:
3624 ret = iscsit_send_reject(cmd, conn);
3626 case ISTATE_SEND_TASKMGTRSP:
3627 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3630 ret = iscsit_tmr_post_handler(cmd, conn);
3632 iscsit_fall_back_to_erl0(conn->sess);
3634 case ISTATE_SEND_TEXTRSP:
3635 ret = iscsit_send_text_rsp(cmd, conn);
3638 pr_err("Unknown Opcode: 0x%02x ITT:"
3639 " 0x%08x, i_state: %d on CID: %hu\n",
3640 cmd->iscsi_opcode, cmd->init_task_tag,
3647 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3648 iscsit_tx_thread_wait_for_tcp(conn);
3649 iscsit_unmap_iovec(cmd);
3652 iscsit_unmap_iovec(cmd);
3655 case ISTATE_SEND_LOGOUTRSP:
3656 if (!iscsit_logout_post_handler(cmd, conn))
3659 case ISTATE_SEND_STATUS:
3660 case ISTATE_SEND_ASYNCMSG:
3661 case ISTATE_SEND_NOPIN:
3662 case ISTATE_SEND_STATUS_RECOVERY:
3663 case ISTATE_SEND_TEXTRSP:
3664 case ISTATE_SEND_TASKMGTRSP:
3665 spin_lock_bh(&cmd->istate_lock);
3666 cmd->i_state = ISTATE_SENT_STATUS;
3667 spin_unlock_bh(&cmd->istate_lock);
3669 case ISTATE_SEND_REJECT:
3670 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3671 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3672 complete(&cmd->reject_comp);
3675 complete(&cmd->reject_comp);
3678 pr_err("Unknown Opcode: 0x%02x ITT:"
3679 " 0x%08x, i_state: %d on CID: %hu\n",
3680 cmd->iscsi_opcode, cmd->init_task_tag,
3681 cmd->i_state, conn->cid);
3685 if (atomic_read(&conn->check_immediate_queue))
3697 int iscsi_target_tx_thread(void *arg)
3700 struct iscsi_conn *conn;
3701 struct iscsi_thread_set *ts = arg;
3703 * Allow ourselves to be interrupted by SIGINT so that a
3704 * connection recovery / failure event can be triggered externally.
3706 allow_signal(SIGINT);
3709 conn = iscsi_tx_thread_pre_handler(ts);
3715 while (!kthread_should_stop()) {
3717 * Ensure that both TX and RX per connection kthreads
3718 * are scheduled to run on the same CPU.
3720 iscsit_thread_check_cpumask(conn, current, 1);
3722 wait_event_interruptible(conn->queues_wq,
3723 !iscsit_conn_all_queues_empty(conn) ||
3724 ts->status == ISCSI_THREAD_SET_RESET);
3726 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3727 signal_pending(current))
3730 ret = handle_immediate_queue(conn);
3734 ret = handle_response_queue(conn);
3742 iscsit_take_action_for_connection_exit(conn);
3748 int iscsi_target_rx_thread(void *arg)
3751 u8 buffer[ISCSI_HDR_LEN], opcode;
3752 u32 checksum = 0, digest = 0;
3753 struct iscsi_conn *conn = NULL;
3754 struct iscsi_thread_set *ts = arg;
3757 * Allow ourselves to be interrupted by SIGINT so that a
3758 * connection recovery / failure event can be triggered externally.
3760 allow_signal(SIGINT);
3763 conn = iscsi_rx_thread_pre_handler(ts);
3767 while (!kthread_should_stop()) {
3769 * Ensure that both TX and RX per connection kthreads
3770 * are scheduled to run on the same CPU.
3772 iscsit_thread_check_cpumask(conn, current, 0);
3774 memset(buffer, 0, ISCSI_HDR_LEN);
3775 memset(&iov, 0, sizeof(struct kvec));
3777 iov.iov_base = buffer;
3778 iov.iov_len = ISCSI_HDR_LEN;
3780 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3781 if (ret != ISCSI_HDR_LEN) {
3782 iscsit_rx_thread_wait_for_tcp(conn);
3787 * Set conn->bad_hdr for use with REJECT PDUs.
3789 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3791 if (conn->conn_ops->HeaderDigest) {
3792 iov.iov_base = &digest;
3793 iov.iov_len = ISCSI_CRC_LEN;
3795 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3796 if (ret != ISCSI_CRC_LEN) {
3797 iscsit_rx_thread_wait_for_tcp(conn);
3801 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3802 buffer, ISCSI_HDR_LEN,
3803 0, NULL, (u8 *)&checksum);
3805 if (digest != checksum) {
3806 pr_err("HeaderDigest CRC32C failed,"
3807 " received 0x%08x, computed 0x%08x\n",
3810 * Set the PDU to 0xff so it will intentionally
3811 * hit default in the switch below.
3813 memset(buffer, 0xff, ISCSI_HDR_LEN);
3814 spin_lock_bh(&conn->sess->session_stats_lock);
3815 conn->sess->conn_digest_errors++;
3816 spin_unlock_bh(&conn->sess->session_stats_lock);
3818 pr_debug("Got HeaderDigest CRC32C"
3819 " 0x%08x\n", checksum);
3823 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3826 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3828 if (conn->sess->sess_ops->SessionType &&
3829 ((!(opcode & ISCSI_OP_TEXT)) ||
3830 (!(opcode & ISCSI_OP_LOGOUT)))) {
3831 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3832 " while in Discovery Session, rejecting.\n", opcode);
3833 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3839 case ISCSI_OP_SCSI_CMD:
3840 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3843 case ISCSI_OP_SCSI_DATA_OUT:
3844 if (iscsit_handle_data_out(conn, buffer) < 0)
3847 case ISCSI_OP_NOOP_OUT:
3848 if (iscsit_handle_nop_out(conn, buffer) < 0)
3851 case ISCSI_OP_SCSI_TMFUNC:
3852 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3856 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3859 case ISCSI_OP_LOGOUT:
3860 ret = iscsit_handle_logout_cmd(conn, buffer);
3862 wait_for_completion_timeout(&conn->conn_logout_comp,
3863 SECONDS_FOR_LOGOUT_COMP * HZ);
3868 case ISCSI_OP_SNACK:
3869 if (iscsit_handle_snack(conn, buffer) < 0)
3873 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3875 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3876 pr_err("Cannot recover from unknown"
3877 " opcode while ERL=0, closing iSCSI connection"
3881 if (!conn->conn_ops->OFMarker) {
3882 pr_err("Unable to recover from unknown"
3883 " opcode while OFMarker=No, closing iSCSI"
3887 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3888 pr_err("Unable to recover from unknown"
3889 " opcode, closing iSCSI connection.\n");
3897 if (!signal_pending(current))
3898 atomic_set(&conn->transport_failed, 1);
3899 iscsit_take_action_for_connection_exit(conn);
3905 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3907 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3908 struct iscsi_session *sess = conn->sess;
3910 * We expect this function to only ever be called from either RX or TX
3911 * thread context via iscsit_close_connection() once the other context
3912 * has been reset -> returned sleeping pre-handler state.
3914 spin_lock_bh(&conn->cmd_lock);
3915 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3917 list_del(&cmd->i_conn_node);
3918 spin_unlock_bh(&conn->cmd_lock);
3920 iscsit_increment_maxcmdsn(cmd, sess);
3922 iscsit_free_cmd(cmd);
3924 spin_lock_bh(&conn->cmd_lock);
3926 spin_unlock_bh(&conn->cmd_lock);
3929 static void iscsit_stop_timers_for_cmds(
3930 struct iscsi_conn *conn)
3932 struct iscsi_cmd *cmd;
3934 spin_lock_bh(&conn->cmd_lock);
3935 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3936 if (cmd->data_direction == DMA_TO_DEVICE)
3937 iscsit_stop_dataout_timer(cmd);
3939 spin_unlock_bh(&conn->cmd_lock);
3942 int iscsit_close_connection(
3943 struct iscsi_conn *conn)
3945 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3946 struct iscsi_session *sess = conn->sess;
3948 pr_debug("Closing iSCSI connection CID %hu on SID:"
3949 " %u\n", conn->cid, sess->sid);
3951 * Always up conn_logout_comp just in case the RX Thread is sleeping
3952 * and the logout response never got sent because the connection
3955 complete(&conn->conn_logout_comp);
3957 iscsi_release_thread_set(conn);
3959 iscsit_stop_timers_for_cmds(conn);
3960 iscsit_stop_nopin_response_timer(conn);
3961 iscsit_stop_nopin_timer(conn);
3962 iscsit_free_queue_reqs_for_conn(conn);
3965 * During Connection recovery drop unacknowledged out of order
3966 * commands for this connection, and prepare the other commands
3969 * During normal operation clear the out of order commands (but
3970 * do not free the struct iscsi_ooo_cmdsn's) and release all
3971 * struct iscsi_cmds.
3973 if (atomic_read(&conn->connection_recovery)) {
3974 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3975 iscsit_prepare_cmds_for_realligance(conn);
3977 iscsit_clear_ooo_cmdsns_for_conn(conn);
3978 iscsit_release_commands_from_conn(conn);
3982 * Handle decrementing session or connection usage count if
3983 * a logout response was not able to be sent because the
3984 * connection failed. Fall back to Session Recovery here.
3986 if (atomic_read(&conn->conn_logout_remove)) {
3987 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
3988 iscsit_dec_conn_usage_count(conn);
3989 iscsit_dec_session_usage_count(sess);
3991 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
3992 iscsit_dec_conn_usage_count(conn);
3994 atomic_set(&conn->conn_logout_remove, 0);
3995 atomic_set(&sess->session_reinstatement, 0);
3996 atomic_set(&sess->session_fall_back_to_erl0, 1);
3999 spin_lock_bh(&sess->conn_lock);
4000 list_del(&conn->conn_list);
4003 * Attempt to let the Initiator know this connection failed by
4004 * sending an Connection Dropped Async Message on another
4005 * active connection.
4007 if (atomic_read(&conn->connection_recovery))
4008 iscsit_build_conn_drop_async_message(conn);
4010 spin_unlock_bh(&sess->conn_lock);
4013 * If connection reinstatement is being performed on this connection,
4014 * up the connection reinstatement semaphore that is being blocked on
4015 * in iscsit_cause_connection_reinstatement().
4017 spin_lock_bh(&conn->state_lock);
4018 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4019 spin_unlock_bh(&conn->state_lock);
4020 complete(&conn->conn_wait_comp);
4021 wait_for_completion(&conn->conn_post_wait_comp);
4022 spin_lock_bh(&conn->state_lock);
4026 * If connection reinstatement is being performed on this connection
4027 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4028 * connection wait rcfr semaphore that is being blocked on
4029 * an iscsit_connection_reinstatement_rcfr().
4031 if (atomic_read(&conn->connection_wait_rcfr)) {
4032 spin_unlock_bh(&conn->state_lock);
4033 complete(&conn->conn_wait_rcfr_comp);
4034 wait_for_completion(&conn->conn_post_wait_comp);
4035 spin_lock_bh(&conn->state_lock);
4037 atomic_set(&conn->connection_reinstatement, 1);
4038 spin_unlock_bh(&conn->state_lock);
4041 * If any other processes are accessing this connection pointer we
4042 * must wait until they have completed.
4044 iscsit_check_conn_usage_count(conn);
4046 if (conn->conn_rx_hash.tfm)
4047 crypto_free_hash(conn->conn_rx_hash.tfm);
4048 if (conn->conn_tx_hash.tfm)
4049 crypto_free_hash(conn->conn_tx_hash.tfm);
4051 if (conn->conn_cpumask)
4052 free_cpumask_var(conn->conn_cpumask);
4054 kfree(conn->conn_ops);
4055 conn->conn_ops = NULL;
4058 sock_release(conn->sock);
4059 conn->thread_set = NULL;
4061 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4062 conn->conn_state = TARG_CONN_STATE_FREE;
4065 spin_lock_bh(&sess->conn_lock);
4066 atomic_dec(&sess->nconn);
4067 pr_debug("Decremented iSCSI connection count to %hu from node:"
4068 " %s\n", atomic_read(&sess->nconn),
4069 sess->sess_ops->InitiatorName);
4071 * Make sure that if one connection fails in an non ERL=2 iSCSI
4072 * Session that they all fail.
4074 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4075 !atomic_read(&sess->session_logout))
4076 atomic_set(&sess->session_fall_back_to_erl0, 1);
4079 * If this was not the last connection in the session, and we are
4080 * performing session reinstatement or falling back to ERL=0, call
4081 * iscsit_stop_session() without sleeping to shutdown the other
4082 * active connections.
4084 if (atomic_read(&sess->nconn)) {
4085 if (!atomic_read(&sess->session_reinstatement) &&
4086 !atomic_read(&sess->session_fall_back_to_erl0)) {
4087 spin_unlock_bh(&sess->conn_lock);
4090 if (!atomic_read(&sess->session_stop_active)) {
4091 atomic_set(&sess->session_stop_active, 1);
4092 spin_unlock_bh(&sess->conn_lock);
4093 iscsit_stop_session(sess, 0, 0);
4096 spin_unlock_bh(&sess->conn_lock);
4101 * If this was the last connection in the session and one of the
4102 * following is occurring:
4104 * Session Reinstatement is not being performed, and are falling back
4105 * to ERL=0 call iscsit_close_session().
4107 * Session Logout was requested. iscsit_close_session() will be called
4110 * Session Continuation is not being performed, start the Time2Retain
4111 * handler and check if sleep_on_sess_wait_sem is active.
4113 if (!atomic_read(&sess->session_reinstatement) &&
4114 atomic_read(&sess->session_fall_back_to_erl0)) {
4115 spin_unlock_bh(&sess->conn_lock);
4116 target_put_session(sess->se_sess);
4119 } else if (atomic_read(&sess->session_logout)) {
4120 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4121 sess->session_state = TARG_SESS_STATE_FREE;
4122 spin_unlock_bh(&sess->conn_lock);
4124 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4125 complete(&sess->session_wait_comp);
4129 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4130 sess->session_state = TARG_SESS_STATE_FAILED;
4132 if (!atomic_read(&sess->session_continuation)) {
4133 spin_unlock_bh(&sess->conn_lock);
4134 iscsit_start_time2retain_handler(sess);
4136 spin_unlock_bh(&sess->conn_lock);
4138 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4139 complete(&sess->session_wait_comp);
4143 spin_unlock_bh(&sess->conn_lock);
4148 int iscsit_close_session(struct iscsi_session *sess)
4150 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4151 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4153 if (atomic_read(&sess->nconn)) {
4154 pr_err("%d connection(s) still exist for iSCSI session"
4155 " to %s\n", atomic_read(&sess->nconn),
4156 sess->sess_ops->InitiatorName);
4160 spin_lock_bh(&se_tpg->session_lock);
4161 atomic_set(&sess->session_logout, 1);
4162 atomic_set(&sess->session_reinstatement, 1);
4163 iscsit_stop_time2retain_timer(sess);
4164 spin_unlock_bh(&se_tpg->session_lock);
4167 * transport_deregister_session_configfs() will clear the
4168 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4169 * can be setting it again with __transport_register_session() in
4170 * iscsi_post_login_handler() again after the iscsit_stop_session()
4171 * completes in iscsi_np context.
4173 transport_deregister_session_configfs(sess->se_sess);
4176 * If any other processes are accessing this session pointer we must
4177 * wait until they have completed. If we are in an interrupt (the
4178 * time2retain handler) and contain and active session usage count we
4179 * restart the timer and exit.
4181 if (!in_interrupt()) {
4182 if (iscsit_check_session_usage_count(sess) == 1)
4183 iscsit_stop_session(sess, 1, 1);
4185 if (iscsit_check_session_usage_count(sess) == 2) {
4186 atomic_set(&sess->session_logout, 0);
4187 iscsit_start_time2retain_handler(sess);
4192 transport_deregister_session(sess->se_sess);
4194 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4195 iscsit_free_connection_recovery_entires(sess);
4197 iscsit_free_all_ooo_cmdsns(sess);
4199 spin_lock_bh(&se_tpg->session_lock);
4200 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4201 sess->session_state = TARG_SESS_STATE_FREE;
4202 pr_debug("Released iSCSI session from node: %s\n",
4203 sess->sess_ops->InitiatorName);
4206 tpg->tpg_tiqn->tiqn_nsessions--;
4208 pr_debug("Decremented number of active iSCSI Sessions on"
4209 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4211 spin_lock(&sess_idr_lock);
4212 idr_remove(&sess_idr, sess->session_index);
4213 spin_unlock(&sess_idr_lock);
4215 kfree(sess->sess_ops);
4216 sess->sess_ops = NULL;
4217 spin_unlock_bh(&se_tpg->session_lock);
4223 static void iscsit_logout_post_handler_closesession(
4224 struct iscsi_conn *conn)
4226 struct iscsi_session *sess = conn->sess;
4228 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4229 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4231 atomic_set(&conn->conn_logout_remove, 0);
4232 complete(&conn->conn_logout_comp);
4234 iscsit_dec_conn_usage_count(conn);
4235 iscsit_stop_session(sess, 1, 1);
4236 iscsit_dec_session_usage_count(sess);
4237 target_put_session(sess->se_sess);
4240 static void iscsit_logout_post_handler_samecid(
4241 struct iscsi_conn *conn)
4243 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4244 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4246 atomic_set(&conn->conn_logout_remove, 0);
4247 complete(&conn->conn_logout_comp);
4249 iscsit_cause_connection_reinstatement(conn, 1);
4250 iscsit_dec_conn_usage_count(conn);
4253 static void iscsit_logout_post_handler_diffcid(
4254 struct iscsi_conn *conn,
4257 struct iscsi_conn *l_conn;
4258 struct iscsi_session *sess = conn->sess;
4263 spin_lock_bh(&sess->conn_lock);
4264 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4265 if (l_conn->cid == cid) {
4266 iscsit_inc_conn_usage_count(l_conn);
4270 spin_unlock_bh(&sess->conn_lock);
4276 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4278 spin_lock_bh(&l_conn->state_lock);
4279 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4280 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4281 spin_unlock_bh(&l_conn->state_lock);
4283 iscsit_cause_connection_reinstatement(l_conn, 1);
4284 iscsit_dec_conn_usage_count(l_conn);
4288 * Return of 0 causes the TX thread to restart.
4290 static int iscsit_logout_post_handler(
4291 struct iscsi_cmd *cmd,
4292 struct iscsi_conn *conn)
4296 switch (cmd->logout_reason) {
4297 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4298 switch (cmd->logout_response) {
4299 case ISCSI_LOGOUT_SUCCESS:
4300 case ISCSI_LOGOUT_CLEANUP_FAILED:
4302 iscsit_logout_post_handler_closesession(conn);
4307 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4308 if (conn->cid == cmd->logout_cid) {
4309 switch (cmd->logout_response) {
4310 case ISCSI_LOGOUT_SUCCESS:
4311 case ISCSI_LOGOUT_CLEANUP_FAILED:
4313 iscsit_logout_post_handler_samecid(conn);
4318 switch (cmd->logout_response) {
4319 case ISCSI_LOGOUT_SUCCESS:
4320 iscsit_logout_post_handler_diffcid(conn,
4323 case ISCSI_LOGOUT_CID_NOT_FOUND:
4324 case ISCSI_LOGOUT_CLEANUP_FAILED:
4331 case ISCSI_LOGOUT_REASON_RECOVERY:
4332 switch (cmd->logout_response) {
4333 case ISCSI_LOGOUT_SUCCESS:
4334 case ISCSI_LOGOUT_CID_NOT_FOUND:
4335 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4336 case ISCSI_LOGOUT_CLEANUP_FAILED:
4349 void iscsit_fail_session(struct iscsi_session *sess)
4351 struct iscsi_conn *conn;
4353 spin_lock_bh(&sess->conn_lock);
4354 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4355 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4356 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4358 spin_unlock_bh(&sess->conn_lock);
4360 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4361 sess->session_state = TARG_SESS_STATE_FAILED;
4364 int iscsit_free_session(struct iscsi_session *sess)
4366 u16 conn_count = atomic_read(&sess->nconn);
4367 struct iscsi_conn *conn, *conn_tmp = NULL;
4370 spin_lock_bh(&sess->conn_lock);
4371 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4373 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4375 if (conn_count == 0)
4378 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4381 iscsit_inc_conn_usage_count(conn_tmp);
4384 iscsit_inc_conn_usage_count(conn);
4386 spin_unlock_bh(&sess->conn_lock);
4387 iscsit_cause_connection_reinstatement(conn, 1);
4388 spin_lock_bh(&sess->conn_lock);
4390 iscsit_dec_conn_usage_count(conn);
4392 iscsit_dec_conn_usage_count(conn_tmp);
4397 if (atomic_read(&sess->nconn)) {
4398 spin_unlock_bh(&sess->conn_lock);
4399 wait_for_completion(&sess->session_wait_comp);
4401 spin_unlock_bh(&sess->conn_lock);
4403 target_put_session(sess->se_sess);
4407 void iscsit_stop_session(
4408 struct iscsi_session *sess,
4410 int connection_sleep)
4412 u16 conn_count = atomic_read(&sess->nconn);
4413 struct iscsi_conn *conn, *conn_tmp = NULL;
4416 spin_lock_bh(&sess->conn_lock);
4418 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4420 if (connection_sleep) {
4421 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4423 if (conn_count == 0)
4426 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4429 iscsit_inc_conn_usage_count(conn_tmp);
4432 iscsit_inc_conn_usage_count(conn);
4434 spin_unlock_bh(&sess->conn_lock);
4435 iscsit_cause_connection_reinstatement(conn, 1);
4436 spin_lock_bh(&sess->conn_lock);
4438 iscsit_dec_conn_usage_count(conn);
4440 iscsit_dec_conn_usage_count(conn_tmp);
4444 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4445 iscsit_cause_connection_reinstatement(conn, 0);
4448 if (session_sleep && atomic_read(&sess->nconn)) {
4449 spin_unlock_bh(&sess->conn_lock);
4450 wait_for_completion(&sess->session_wait_comp);
4452 spin_unlock_bh(&sess->conn_lock);
4455 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4457 struct iscsi_session *sess;
4458 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4459 struct se_session *se_sess, *se_sess_tmp;
4460 int session_count = 0;
4462 spin_lock_bh(&se_tpg->session_lock);
4463 if (tpg->nsessions && !force) {
4464 spin_unlock_bh(&se_tpg->session_lock);
4468 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4470 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4472 spin_lock(&sess->conn_lock);
4473 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4474 atomic_read(&sess->session_logout) ||
4475 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4476 spin_unlock(&sess->conn_lock);
4479 atomic_set(&sess->session_reinstatement, 1);
4480 spin_unlock(&sess->conn_lock);
4481 spin_unlock_bh(&se_tpg->session_lock);
4483 iscsit_free_session(sess);
4484 spin_lock_bh(&se_tpg->session_lock);
4488 spin_unlock_bh(&se_tpg->session_lock);
4490 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4491 " Group: %hu\n", session_count, tpg->tpgt);
4495 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4496 MODULE_VERSION("4.1.x");
4497 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4498 MODULE_LICENSE("GPL");
4500 module_init(iscsi_target_init_module);
4501 module_exit(iscsi_target_cleanup_module);