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 #include <target/iscsi/iscsi_transport.h>
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_MUTEX(np_lock);
59 static struct idr tiqn_idr;
61 struct mutex auth_id_lock;
62 spinlock_t sess_idr_lock;
64 struct iscsit_global *iscsit_global;
66 struct kmem_cache *lio_cmd_cache;
67 struct kmem_cache *lio_qr_cache;
68 struct kmem_cache *lio_dr_cache;
69 struct kmem_cache *lio_ooo_cache;
70 struct kmem_cache *lio_r2t_cache;
72 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
73 struct iscsi_scsi_req *, u32);
75 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
77 struct iscsi_tiqn *tiqn = NULL;
79 spin_lock(&tiqn_lock);
80 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
81 if (!strcmp(tiqn->tiqn, buf)) {
83 spin_lock(&tiqn->tiqn_state_lock);
84 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
85 tiqn->tiqn_access_count++;
86 spin_unlock(&tiqn->tiqn_state_lock);
87 spin_unlock(&tiqn_lock);
90 spin_unlock(&tiqn->tiqn_state_lock);
93 spin_unlock(&tiqn_lock);
98 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
100 spin_lock(&tiqn->tiqn_state_lock);
101 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
102 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
103 spin_unlock(&tiqn->tiqn_state_lock);
106 spin_unlock(&tiqn->tiqn_state_lock);
111 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
113 spin_lock(&tiqn->tiqn_state_lock);
114 tiqn->tiqn_access_count--;
115 spin_unlock(&tiqn->tiqn_state_lock);
119 * Note that IQN formatting is expected to be done in userspace, and
120 * no explict IQN format checks are done here.
122 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
124 struct iscsi_tiqn *tiqn = NULL;
127 if (strlen(buf) >= ISCSI_IQN_LEN) {
128 pr_err("Target IQN exceeds %d bytes\n",
130 return ERR_PTR(-EINVAL);
133 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
135 pr_err("Unable to allocate struct iscsi_tiqn\n");
136 return ERR_PTR(-ENOMEM);
139 sprintf(tiqn->tiqn, "%s", buf);
140 INIT_LIST_HEAD(&tiqn->tiqn_list);
141 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
142 spin_lock_init(&tiqn->tiqn_state_lock);
143 spin_lock_init(&tiqn->tiqn_tpg_lock);
144 spin_lock_init(&tiqn->sess_err_stats.lock);
145 spin_lock_init(&tiqn->login_stats.lock);
146 spin_lock_init(&tiqn->logout_stats.lock);
148 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
150 idr_preload(GFP_KERNEL);
151 spin_lock(&tiqn_lock);
153 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
155 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
156 spin_unlock(&tiqn_lock);
161 tiqn->tiqn_index = ret;
162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
164 spin_unlock(&tiqn_lock);
167 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
173 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
176 * Wait for accesses to said struct iscsi_tiqn to end.
178 spin_lock(&tiqn->tiqn_state_lock);
179 while (tiqn->tiqn_access_count != 0) {
180 spin_unlock(&tiqn->tiqn_state_lock);
182 spin_lock(&tiqn->tiqn_state_lock);
184 spin_unlock(&tiqn->tiqn_state_lock);
187 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
190 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
191 * while holding tiqn->tiqn_state_lock. This means that all subsequent
192 * attempts to access this struct iscsi_tiqn will fail from both transport
193 * fabric and control code paths.
195 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
196 pr_err("iscsit_set_tiqn_shutdown() failed\n");
200 iscsit_wait_for_tiqn(tiqn);
202 spin_lock(&tiqn_lock);
203 list_del(&tiqn->tiqn_list);
204 idr_remove(&tiqn_idr, tiqn->tiqn_index);
205 spin_unlock(&tiqn_lock);
207 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
212 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
216 * Determine if the network portal is accepting storage traffic.
218 spin_lock_bh(&np->np_thread_lock);
219 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
220 spin_unlock_bh(&np->np_thread_lock);
223 if (np->np_login_tpg) {
224 pr_err("np->np_login_tpg() is not NULL!\n");
225 spin_unlock_bh(&np->np_thread_lock);
228 spin_unlock_bh(&np->np_thread_lock);
230 * Determine if the portal group is accepting storage traffic.
232 spin_lock_bh(&tpg->tpg_state_lock);
233 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
234 spin_unlock_bh(&tpg->tpg_state_lock);
237 spin_unlock_bh(&tpg->tpg_state_lock);
240 * Here we serialize access across the TIQN+TPG Tuple.
242 ret = mutex_lock_interruptible(&tpg->np_login_lock);
243 if ((ret != 0) || signal_pending(current))
246 spin_lock_bh(&np->np_thread_lock);
247 np->np_login_tpg = tpg;
248 spin_unlock_bh(&np->np_thread_lock);
253 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
255 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
257 spin_lock_bh(&np->np_thread_lock);
258 np->np_login_tpg = NULL;
259 spin_unlock_bh(&np->np_thread_lock);
261 mutex_unlock(&tpg->np_login_lock);
264 iscsit_put_tiqn_for_login(tiqn);
269 bool iscsit_check_np_match(
270 struct __kernel_sockaddr_storage *sockaddr,
272 int network_transport)
274 struct sockaddr_in *sock_in, *sock_in_e;
275 struct sockaddr_in6 *sock_in6, *sock_in6_e;
276 bool ip_match = false;
279 if (sockaddr->ss_family == AF_INET6) {
280 sock_in6 = (struct sockaddr_in6 *)sockaddr;
281 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
283 if (!memcmp(&sock_in6->sin6_addr.in6_u,
284 &sock_in6_e->sin6_addr.in6_u,
285 sizeof(struct in6_addr)))
288 port = ntohs(sock_in6->sin6_port);
290 sock_in = (struct sockaddr_in *)sockaddr;
291 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
293 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
296 port = ntohs(sock_in->sin_port);
299 if ((ip_match == true) && (np->np_port == port) &&
300 (np->np_network_transport == network_transport))
307 * Called with mutex np_lock held
309 static struct iscsi_np *iscsit_get_np(
310 struct __kernel_sockaddr_storage *sockaddr,
311 int network_transport)
316 list_for_each_entry(np, &g_np_list, np_list) {
317 spin_lock_bh(&np->np_thread_lock);
318 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
319 spin_unlock_bh(&np->np_thread_lock);
323 match = iscsit_check_np_match(sockaddr, np, network_transport);
326 * Increment the np_exports reference count now to
327 * prevent iscsit_del_np() below from being called
328 * while iscsi_tpg_add_network_portal() is called.
331 spin_unlock_bh(&np->np_thread_lock);
334 spin_unlock_bh(&np->np_thread_lock);
340 struct iscsi_np *iscsit_add_np(
341 struct __kernel_sockaddr_storage *sockaddr,
343 int network_transport)
345 struct sockaddr_in *sock_in;
346 struct sockaddr_in6 *sock_in6;
350 mutex_lock(&np_lock);
353 * Locate the existing struct iscsi_np if already active..
355 np = iscsit_get_np(sockaddr, network_transport);
357 mutex_unlock(&np_lock);
361 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
363 pr_err("Unable to allocate memory for struct iscsi_np\n");
364 mutex_unlock(&np_lock);
365 return ERR_PTR(-ENOMEM);
368 np->np_flags |= NPF_IP_NETWORK;
369 if (sockaddr->ss_family == AF_INET6) {
370 sock_in6 = (struct sockaddr_in6 *)sockaddr;
371 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
372 np->np_port = ntohs(sock_in6->sin6_port);
374 sock_in = (struct sockaddr_in *)sockaddr;
375 sprintf(np->np_ip, "%s", ip_str);
376 np->np_port = ntohs(sock_in->sin_port);
379 np->np_network_transport = network_transport;
380 spin_lock_init(&np->np_thread_lock);
381 init_completion(&np->np_restart_comp);
382 INIT_LIST_HEAD(&np->np_list);
384 ret = iscsi_target_setup_login_socket(np, sockaddr);
387 mutex_unlock(&np_lock);
391 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
392 if (IS_ERR(np->np_thread)) {
393 pr_err("Unable to create kthread: iscsi_np\n");
394 ret = PTR_ERR(np->np_thread);
396 mutex_unlock(&np_lock);
400 * Increment the np_exports reference count now to prevent
401 * iscsit_del_np() below from being run while a new call to
402 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
403 * active. We don't need to hold np->np_thread_lock at this
404 * point because iscsi_np has not been added to g_np_list yet.
407 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
409 list_add_tail(&np->np_list, &g_np_list);
410 mutex_unlock(&np_lock);
412 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
413 np->np_ip, np->np_port, np->np_transport->name);
418 int iscsit_reset_np_thread(
420 struct iscsi_tpg_np *tpg_np,
421 struct iscsi_portal_group *tpg)
423 spin_lock_bh(&np->np_thread_lock);
426 * The reset operation need only be performed when the
427 * passed struct iscsi_portal_group has a login in progress
428 * to one of the network portals.
430 if (tpg_np->tpg_np->np_login_tpg != tpg) {
431 spin_unlock_bh(&np->np_thread_lock);
435 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
436 spin_unlock_bh(&np->np_thread_lock);
439 np->np_thread_state = ISCSI_NP_THREAD_RESET;
442 spin_unlock_bh(&np->np_thread_lock);
443 send_sig(SIGINT, np->np_thread, 1);
444 wait_for_completion(&np->np_restart_comp);
445 spin_lock_bh(&np->np_thread_lock);
447 spin_unlock_bh(&np->np_thread_lock);
452 static void iscsit_free_np(struct iscsi_np *np)
455 sock_release(np->np_socket);
458 int iscsit_del_np(struct iscsi_np *np)
460 spin_lock_bh(&np->np_thread_lock);
462 if (np->np_exports) {
463 spin_unlock_bh(&np->np_thread_lock);
466 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
467 spin_unlock_bh(&np->np_thread_lock);
471 * We need to send the signal to wakeup Linux/Net
472 * which may be sleeping in sock_accept()..
474 send_sig(SIGINT, np->np_thread, 1);
475 kthread_stop(np->np_thread);
478 np->np_transport->iscsit_free_np(np);
480 mutex_lock(&np_lock);
481 list_del(&np->np_list);
482 mutex_unlock(&np_lock);
484 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
485 np->np_ip, np->np_port, np->np_transport->name);
487 iscsit_put_transport(np->np_transport);
492 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
493 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
497 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
501 static struct iscsit_transport iscsi_target_transport = {
503 .transport_type = ISCSI_TCP,
505 .iscsit_setup_np = iscsit_setup_np,
506 .iscsit_accept_np = iscsit_accept_np,
507 .iscsit_free_np = iscsit_free_np,
508 .iscsit_alloc_cmd = iscsit_alloc_cmd,
509 .iscsit_get_login_rx = iscsit_get_login_rx,
510 .iscsit_put_login_tx = iscsit_put_login_tx,
511 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
512 .iscsit_immediate_queue = iscsit_immediate_queue,
513 .iscsit_response_queue = iscsit_response_queue,
514 .iscsit_queue_data_in = iscsit_queue_rsp,
515 .iscsit_queue_status = iscsit_queue_rsp,
518 static int __init iscsi_target_init_module(void)
522 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
524 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
525 if (!iscsit_global) {
526 pr_err("Unable to allocate memory for iscsit_global\n");
529 mutex_init(&auth_id_lock);
530 spin_lock_init(&sess_idr_lock);
534 ret = iscsi_target_register_configfs();
538 ret = iscsi_thread_set_init();
542 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
543 TARGET_THREAD_SET_COUNT) {
544 pr_err("iscsi_allocate_thread_sets() returned"
545 " unexpected value!\n");
549 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
550 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
552 if (!lio_cmd_cache) {
553 pr_err("Unable to kmem_cache_create() for"
558 lio_qr_cache = kmem_cache_create("lio_qr_cache",
559 sizeof(struct iscsi_queue_req),
560 __alignof__(struct iscsi_queue_req), 0, NULL);
562 pr_err("nable to kmem_cache_create() for"
567 lio_dr_cache = kmem_cache_create("lio_dr_cache",
568 sizeof(struct iscsi_datain_req),
569 __alignof__(struct iscsi_datain_req), 0, NULL);
571 pr_err("Unable to kmem_cache_create() for"
576 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
577 sizeof(struct iscsi_ooo_cmdsn),
578 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
579 if (!lio_ooo_cache) {
580 pr_err("Unable to kmem_cache_create() for"
585 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
586 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
588 if (!lio_r2t_cache) {
589 pr_err("Unable to kmem_cache_create() for"
594 iscsit_register_transport(&iscsi_target_transport);
596 if (iscsit_load_discovery_tpg() < 0)
601 kmem_cache_destroy(lio_r2t_cache);
603 kmem_cache_destroy(lio_ooo_cache);
605 kmem_cache_destroy(lio_dr_cache);
607 kmem_cache_destroy(lio_qr_cache);
609 kmem_cache_destroy(lio_cmd_cache);
611 iscsi_deallocate_thread_sets();
613 iscsi_thread_set_free();
615 iscsi_target_deregister_configfs();
617 kfree(iscsit_global);
621 static void __exit iscsi_target_cleanup_module(void)
623 iscsi_deallocate_thread_sets();
624 iscsi_thread_set_free();
625 iscsit_release_discovery_tpg();
626 iscsit_unregister_transport(&iscsi_target_transport);
627 kmem_cache_destroy(lio_cmd_cache);
628 kmem_cache_destroy(lio_qr_cache);
629 kmem_cache_destroy(lio_dr_cache);
630 kmem_cache_destroy(lio_ooo_cache);
631 kmem_cache_destroy(lio_r2t_cache);
633 iscsi_target_deregister_configfs();
635 kfree(iscsit_global);
638 static int iscsit_add_reject(
639 struct iscsi_conn *conn,
643 struct iscsi_cmd *cmd;
645 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
649 cmd->iscsi_opcode = ISCSI_OP_REJECT;
650 cmd->reject_reason = reason;
652 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
654 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
655 iscsit_free_cmd(cmd, false);
659 spin_lock_bh(&conn->cmd_lock);
660 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
661 spin_unlock_bh(&conn->cmd_lock);
663 cmd->i_state = ISTATE_SEND_REJECT;
664 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
669 static int iscsit_add_reject_from_cmd(
670 struct iscsi_cmd *cmd,
675 struct iscsi_conn *conn;
678 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
684 cmd->iscsi_opcode = ISCSI_OP_REJECT;
685 cmd->reject_reason = reason;
687 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
689 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
690 iscsit_free_cmd(cmd, false);
695 spin_lock_bh(&conn->cmd_lock);
696 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
697 spin_unlock_bh(&conn->cmd_lock);
700 cmd->i_state = ISTATE_SEND_REJECT;
701 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
703 * Perform the kref_put now if se_cmd has already been setup by
704 * scsit_setup_scsi_cmd()
706 if (cmd->se_cmd.se_tfo != NULL) {
707 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
708 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
713 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
716 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
719 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
721 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
725 * Map some portion of the allocated scatterlist to an iovec, suitable for
726 * kernel sockets to copy data in/out.
728 static int iscsit_map_iovec(
729 struct iscsi_cmd *cmd,
735 struct scatterlist *sg;
736 unsigned int page_off;
739 * We know each entry in t_data_sg contains a page.
741 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
742 page_off = (data_offset % PAGE_SIZE);
744 cmd->first_data_sg = sg;
745 cmd->first_data_sg_off = page_off;
747 while (data_length) {
748 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
750 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
751 iov[i].iov_len = cur_len;
753 data_length -= cur_len;
759 cmd->kmapped_nents = i;
764 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
767 struct scatterlist *sg;
769 sg = cmd->first_data_sg;
771 for (i = 0; i < cmd->kmapped_nents; i++)
772 kunmap(sg_page(&sg[i]));
775 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
777 struct iscsi_cmd *cmd;
779 conn->exp_statsn = exp_statsn;
781 if (conn->sess->sess_ops->RDMAExtensions)
784 spin_lock_bh(&conn->cmd_lock);
785 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
786 spin_lock(&cmd->istate_lock);
787 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
788 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
789 cmd->i_state = ISTATE_REMOVE;
790 spin_unlock(&cmd->istate_lock);
791 iscsit_add_cmd_to_immediate_queue(cmd, conn,
795 spin_unlock(&cmd->istate_lock);
797 spin_unlock_bh(&conn->cmd_lock);
800 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
802 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
804 iov_count += ISCSI_IOV_DATA_BUFFER;
806 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
807 if (!cmd->iov_data) {
808 pr_err("Unable to allocate cmd->iov_data\n");
812 cmd->orig_iov_data_count = iov_count;
816 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
819 int data_direction, payload_length;
820 struct iscsi_scsi_req *hdr;
824 spin_lock_bh(&conn->sess->session_stats_lock);
825 conn->sess->cmd_pdus++;
826 if (conn->sess->se_sess->se_node_acl) {
827 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
828 conn->sess->se_sess->se_node_acl->num_cmds++;
829 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
831 spin_unlock_bh(&conn->sess->session_stats_lock);
833 hdr = (struct iscsi_scsi_req *) buf;
834 payload_length = ntoh24(hdr->dlength);
836 /* FIXME; Add checks for AdditionalHeaderSegment */
838 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
839 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
840 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
841 " not set. Bad iSCSI Initiator.\n");
842 return iscsit_add_reject_cmd(cmd,
843 ISCSI_REASON_BOOKMARK_INVALID, buf);
846 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
847 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
849 * From RFC-3720 Section 10.3.1:
851 * "Either or both of R and W MAY be 1 when either the
852 * Expected Data Transfer Length and/or Bidirectional Read
853 * Expected Data Transfer Length are 0"
855 * For this case, go ahead and clear the unnecssary bits
856 * to avoid any confusion with ->data_direction.
858 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
859 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
861 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
862 " set when Expected Data Transfer Length is 0 for"
863 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
866 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
867 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
868 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
869 " MUST be set if Expected Data Transfer Length is not 0."
870 " Bad iSCSI Initiator\n");
871 return iscsit_add_reject_cmd(cmd,
872 ISCSI_REASON_BOOKMARK_INVALID, buf);
875 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
876 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
877 pr_err("Bidirectional operations not supported!\n");
878 return iscsit_add_reject_cmd(cmd,
879 ISCSI_REASON_BOOKMARK_INVALID, buf);
882 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
883 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
884 " Scsi Command PDU.\n");
885 return iscsit_add_reject_cmd(cmd,
886 ISCSI_REASON_BOOKMARK_INVALID, buf);
889 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
890 pr_err("ImmediateData=No but DataSegmentLength=%u,"
891 " protocol error.\n", payload_length);
892 return iscsit_add_reject_cmd(cmd,
893 ISCSI_REASON_PROTOCOL_ERROR, buf);
896 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
897 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
898 pr_err("Expected Data Transfer Length and Length of"
899 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
900 " bit is not set protocol error\n");
901 return iscsit_add_reject_cmd(cmd,
902 ISCSI_REASON_PROTOCOL_ERROR, buf);
905 if (payload_length > be32_to_cpu(hdr->data_length)) {
906 pr_err("DataSegmentLength: %u is greater than"
907 " EDTL: %u, protocol error.\n", payload_length,
909 return iscsit_add_reject_cmd(cmd,
910 ISCSI_REASON_PROTOCOL_ERROR, buf);
913 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
914 pr_err("DataSegmentLength: %u is greater than"
915 " MaxXmitDataSegmentLength: %u, protocol error.\n",
916 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
917 return iscsit_add_reject_cmd(cmd,
918 ISCSI_REASON_PROTOCOL_ERROR, buf);
921 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
922 pr_err("DataSegmentLength: %u is greater than"
923 " FirstBurstLength: %u, protocol error.\n",
924 payload_length, conn->sess->sess_ops->FirstBurstLength);
925 return iscsit_add_reject_cmd(cmd,
926 ISCSI_REASON_BOOKMARK_INVALID, buf);
929 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
930 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
933 cmd->data_direction = data_direction;
934 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
936 * Figure out the SAM Task Attribute for the incoming SCSI CDB
938 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
939 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
940 sam_task_attr = MSG_SIMPLE_TAG;
941 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
942 sam_task_attr = MSG_ORDERED_TAG;
943 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
944 sam_task_attr = MSG_HEAD_TAG;
945 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
946 sam_task_attr = MSG_ACA_TAG;
948 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
949 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
950 sam_task_attr = MSG_SIMPLE_TAG;
953 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
954 cmd->i_state = ISTATE_NEW_CMD;
955 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
956 cmd->immediate_data = (payload_length) ? 1 : 0;
957 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
958 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
959 if (cmd->unsolicited_data)
960 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
962 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
963 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
964 spin_lock_bh(&conn->sess->ttt_lock);
965 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
966 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
967 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
968 spin_unlock_bh(&conn->sess->ttt_lock);
969 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
970 cmd->targ_xfer_tag = 0xFFFFFFFF;
971 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
972 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
973 cmd->first_burst_len = payload_length;
975 if (!conn->sess->sess_ops->RDMAExtensions &&
976 cmd->data_direction == DMA_FROM_DEVICE) {
977 struct iscsi_datain_req *dr;
979 dr = iscsit_allocate_datain_req();
981 return iscsit_add_reject_cmd(cmd,
982 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
984 iscsit_attach_datain_req(cmd, dr);
988 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
990 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
991 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
992 cmd->data_direction, sam_task_attr,
993 cmd->sense_buffer + 2);
995 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
996 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
997 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1000 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1002 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1003 scsilun_to_int(&hdr->lun));
1004 if (cmd->sense_reason)
1007 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1008 if (cmd->sense_reason) {
1009 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1010 return iscsit_add_reject_cmd(cmd,
1011 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1017 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1018 return iscsit_add_reject_cmd(cmd,
1019 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1023 spin_lock_bh(&conn->cmd_lock);
1024 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1025 spin_unlock_bh(&conn->cmd_lock);
1027 * Check if we need to delay processing because of ALUA
1028 * Active/NonOptimized primary access state..
1030 core_alua_check_nonop_delay(&cmd->se_cmd);
1034 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1036 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
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);
1044 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1046 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1047 struct iscsi_scsi_req *hdr)
1051 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1052 * the Immediate Bit is not set, and no Immediate
1055 * A PDU/CmdSN carrying Immediate Data can only
1056 * be processed after the DataCRC has passed.
1057 * If the DataCRC fails, the CmdSN MUST NOT
1058 * be acknowledged. (See below)
1060 if (!cmd->immediate_data) {
1061 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1062 (unsigned char *)hdr, hdr->cmdsn);
1063 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1065 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1066 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1071 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1074 * If no Immediate Data is attached, it's OK to return now.
1076 if (!cmd->immediate_data) {
1077 if (!cmd->sense_reason && cmd->unsolicited_data)
1078 iscsit_set_unsoliticed_dataout(cmd);
1079 if (!cmd->sense_reason)
1082 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1087 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1088 * execution. These exceptions are processed in CmdSN order using
1089 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1091 if (cmd->sense_reason) {
1092 if (cmd->reject_reason)
1098 * Call directly into transport_generic_new_cmd() to perform
1099 * the backend memory allocation.
1101 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1102 if (cmd->sense_reason)
1107 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1110 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1113 struct iscsi_conn *conn = cmd->conn;
1114 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1116 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1118 if (dump_payload == true)
1119 goto after_immediate_data;
1121 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1122 cmd->first_burst_len);
1123 after_immediate_data:
1124 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1126 * A PDU/CmdSN carrying Immediate Data passed
1127 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1128 * Immediate Bit is not set.
1130 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1131 (unsigned char *)hdr, hdr->cmdsn);
1132 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1135 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1138 rc = iscsit_dump_data_payload(cmd->conn,
1139 cmd->first_burst_len, 1);
1140 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1142 } else if (cmd->unsolicited_data)
1143 iscsit_set_unsoliticed_dataout(cmd);
1145 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1147 * Immediate Data failed DataCRC and ERL>=1,
1148 * silently drop this PDU and let the initiator
1149 * plug the CmdSN gap.
1151 * FIXME: Send Unsolicited NOPIN with reserved
1152 * TTT here to help the initiator figure out
1153 * the missing CmdSN, although they should be
1154 * intelligent enough to determine the missing
1155 * CmdSN and issue a retry to plug the sequence.
1157 cmd->i_state = ISTATE_REMOVE;
1158 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1159 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1166 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1169 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1171 bool dump_payload = false;
1173 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1177 * Allocation iovecs needed for struct socket operations for
1178 * traditional iSCSI block I/O.
1180 if (iscsit_allocate_iovecs(cmd) < 0) {
1181 return iscsit_add_reject_cmd(cmd,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184 immed_data = cmd->immediate_data;
1186 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1190 dump_payload = true;
1195 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1198 static u32 iscsit_do_crypto_hash_sg(
1199 struct hash_desc *hash,
1200 struct iscsi_cmd *cmd,
1208 struct scatterlist *sg;
1209 unsigned int page_off;
1211 crypto_hash_init(hash);
1213 sg = cmd->first_data_sg;
1214 page_off = cmd->first_data_sg_off;
1217 while (data_length) {
1218 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1220 crypto_hash_update(hash, &sg[i], cur_len);
1222 data_length -= cur_len;
1228 struct scatterlist pad_sg;
1230 sg_init_one(&pad_sg, pad_bytes, padding);
1231 crypto_hash_update(hash, &pad_sg, padding);
1233 crypto_hash_final(hash, (u8 *) &data_crc);
1238 static void iscsit_do_crypto_hash_buf(
1239 struct hash_desc *hash,
1246 struct scatterlist sg;
1248 crypto_hash_init(hash);
1250 sg_init_one(&sg, buf, payload_length);
1251 crypto_hash_update(hash, &sg, payload_length);
1254 sg_init_one(&sg, pad_bytes, padding);
1255 crypto_hash_update(hash, &sg, padding);
1257 crypto_hash_final(hash, data_crc);
1261 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1262 struct iscsi_cmd **out_cmd)
1264 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1265 struct iscsi_cmd *cmd = NULL;
1266 struct se_cmd *se_cmd;
1267 unsigned long flags;
1268 u32 payload_length = ntoh24(hdr->dlength);
1271 if (!payload_length) {
1272 pr_err("DataOUT payload is ZERO, protocol error.\n");
1273 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1278 spin_lock_bh(&conn->sess->session_stats_lock);
1279 conn->sess->rx_data_octets += payload_length;
1280 if (conn->sess->se_sess->se_node_acl) {
1281 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1282 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1283 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1285 spin_unlock_bh(&conn->sess->session_stats_lock);
1287 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1288 pr_err("DataSegmentLength: %u is greater than"
1289 " MaxXmitDataSegmentLength: %u\n", payload_length,
1290 conn->conn_ops->MaxXmitDataSegmentLength);
1291 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1295 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1300 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1301 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1302 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1303 payload_length, conn->cid);
1305 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1306 pr_err("Command ITT: 0x%08x received DataOUT after"
1307 " last DataOUT received, dumping payload\n",
1308 cmd->init_task_tag);
1309 return iscsit_dump_data_payload(conn, payload_length, 1);
1312 if (cmd->data_direction != DMA_TO_DEVICE) {
1313 pr_err("Command ITT: 0x%08x received DataOUT for a"
1314 " NON-WRITE command.\n", cmd->init_task_tag);
1315 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1317 se_cmd = &cmd->se_cmd;
1318 iscsit_mod_dataout_timer(cmd);
1320 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1321 pr_err("DataOut Offset: %u, Length %u greater than"
1322 " iSCSI Command EDTL %u, protocol error.\n",
1323 hdr->offset, payload_length, cmd->se_cmd.data_length);
1324 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1327 if (cmd->unsolicited_data) {
1328 int dump_unsolicited_data = 0;
1330 if (conn->sess->sess_ops->InitialR2T) {
1331 pr_err("Received unexpected unsolicited data"
1332 " while InitialR2T=Yes, protocol error.\n");
1333 transport_send_check_condition_and_sense(&cmd->se_cmd,
1334 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1338 * Special case for dealing with Unsolicited DataOUT
1339 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1343 /* Something's amiss if we're not in WRITE_PENDING state... */
1344 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1345 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1346 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1348 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1349 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1350 dump_unsolicited_data = 1;
1351 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1353 if (dump_unsolicited_data) {
1355 * Check if a delayed TASK_ABORTED status needs to
1356 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1357 * received with the unsolicitied data out.
1359 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1360 iscsit_stop_dataout_timer(cmd);
1362 transport_check_aborted_status(se_cmd,
1363 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1364 return iscsit_dump_data_payload(conn, payload_length, 1);
1368 * For the normal solicited data path:
1370 * Check for a delayed TASK_ABORTED status and dump any
1371 * incoming data out payload if one exists. Also, when the
1372 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1373 * data out sequence, we decrement outstanding_r2ts. Once
1374 * outstanding_r2ts reaches zero, go ahead and send the delayed
1375 * TASK_ABORTED status.
1377 if (se_cmd->transport_state & CMD_T_ABORTED) {
1378 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1379 if (--cmd->outstanding_r2ts < 1) {
1380 iscsit_stop_dataout_timer(cmd);
1381 transport_check_aborted_status(
1385 return iscsit_dump_data_payload(conn, payload_length, 1);
1389 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1390 * within-command recovery checks before receiving the payload.
1392 rc = iscsit_check_pre_dataout(cmd, buf);
1393 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1395 else if (rc == DATAOUT_CANNOT_RECOVER)
1401 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1404 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1405 struct iscsi_data *hdr)
1408 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1409 u32 payload_length = ntoh24(hdr->dlength);
1410 int iov_ret, data_crc_failed = 0;
1412 rx_size += payload_length;
1413 iov = &cmd->iov_data[0];
1415 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1420 iov_count += iov_ret;
1422 padding = ((-payload_length) & 3);
1424 iov[iov_count].iov_base = cmd->pad_bytes;
1425 iov[iov_count++].iov_len = padding;
1427 pr_debug("Receiving %u padding bytes.\n", padding);
1430 if (conn->conn_ops->DataDigest) {
1431 iov[iov_count].iov_base = &checksum;
1432 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1433 rx_size += ISCSI_CRC_LEN;
1436 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1438 iscsit_unmap_iovec(cmd);
1440 if (rx_got != rx_size)
1443 if (conn->conn_ops->DataDigest) {
1446 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1447 be32_to_cpu(hdr->offset),
1448 payload_length, padding,
1451 if (checksum != data_crc) {
1452 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1453 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1454 " does not match computed 0x%08x\n",
1455 hdr->itt, hdr->offset, payload_length,
1456 hdr->datasn, checksum, data_crc);
1457 data_crc_failed = 1;
1459 pr_debug("Got CRC32C DataDigest 0x%08x for"
1460 " %u bytes of Data Out\n", checksum,
1465 return data_crc_failed;
1469 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1470 bool data_crc_failed)
1472 struct iscsi_conn *conn = cmd->conn;
1475 * Increment post receive data and CRC values or perform
1476 * within-command recovery.
1478 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1479 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1481 else if (rc == DATAOUT_SEND_R2T) {
1482 iscsit_set_dataout_sequence_values(cmd);
1483 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1484 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1486 * Handle extra special case for out of order
1487 * Unsolicited Data Out.
1489 spin_lock_bh(&cmd->istate_lock);
1490 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1491 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1492 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1493 spin_unlock_bh(&cmd->istate_lock);
1495 iscsit_stop_dataout_timer(cmd);
1498 target_execute_cmd(&cmd->se_cmd);
1500 } else /* DATAOUT_CANNOT_RECOVER */
1505 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1507 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1509 struct iscsi_cmd *cmd;
1510 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1512 bool data_crc_failed = false;
1514 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1520 rc = iscsit_get_dataout(conn, cmd, hdr);
1524 data_crc_failed = true;
1526 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1529 int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1532 unsigned char *ping_data = NULL;
1533 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1534 u32 checksum, data_crc, padding = 0, payload_length;
1535 struct iscsi_cmd *cmd_p = NULL;
1536 struct kvec *iov = NULL;
1537 struct iscsi_nopout *hdr;
1539 hdr = (struct iscsi_nopout *) buf;
1540 payload_length = ntoh24(hdr->dlength);
1542 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1543 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1544 " not set, protocol error.\n");
1546 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1547 (unsigned char *)hdr);
1549 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1550 (unsigned char *)hdr);
1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1554 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1555 " greater than MaxXmitDataSegmentLength: %u, protocol"
1556 " error.\n", payload_length,
1557 conn->conn_ops->MaxXmitDataSegmentLength);
1559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1560 (unsigned char *)hdr);
1562 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1563 (unsigned char *)hdr);
1566 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1567 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1568 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1569 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1572 * This is not a response to a Unsolicited NopIN, which means
1573 * it can either be a NOPOUT ping request (with a valid ITT),
1574 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1575 * Either way, make sure we allocate an struct iscsi_cmd, as both
1576 * can contain ping data.
1578 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1580 return iscsit_reject_cmd(cmd,
1581 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1582 (unsigned char *)hdr);
1584 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1585 cmd->i_state = ISTATE_SEND_NOPIN;
1586 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1588 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1589 cmd->targ_xfer_tag = 0xFFFFFFFF;
1590 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1591 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1592 cmd->data_direction = DMA_NONE;
1595 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1596 rx_size = payload_length;
1597 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1599 pr_err("Unable to allocate memory for"
1600 " NOPOUT ping data.\n");
1605 iov = &cmd->iov_misc[0];
1606 iov[niov].iov_base = ping_data;
1607 iov[niov++].iov_len = payload_length;
1609 padding = ((-payload_length) & 3);
1611 pr_debug("Receiving %u additional bytes"
1612 " for padding.\n", padding);
1613 iov[niov].iov_base = &cmd->pad_bytes;
1614 iov[niov++].iov_len = padding;
1617 if (conn->conn_ops->DataDigest) {
1618 iov[niov].iov_base = &checksum;
1619 iov[niov++].iov_len = ISCSI_CRC_LEN;
1620 rx_size += ISCSI_CRC_LEN;
1623 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1624 if (rx_got != rx_size) {
1629 if (conn->conn_ops->DataDigest) {
1630 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1631 ping_data, payload_length,
1632 padding, cmd->pad_bytes,
1635 if (checksum != data_crc) {
1636 pr_err("Ping data CRC32C DataDigest"
1637 " 0x%08x does not match computed 0x%08x\n",
1638 checksum, data_crc);
1639 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1640 pr_err("Unable to recover from"
1641 " NOPOUT Ping DataCRC failure while in"
1647 * Silently drop this PDU and let the
1648 * initiator plug the CmdSN gap.
1650 pr_debug("Dropping NOPOUT"
1651 " Command CmdSN: 0x%08x due to"
1652 " DataCRC error.\n", hdr->cmdsn);
1657 pr_debug("Got CRC32C DataDigest"
1658 " 0x%08x for %u bytes of ping data.\n",
1659 checksum, payload_length);
1663 ping_data[payload_length] = '\0';
1665 * Attach ping data to struct iscsi_cmd->buf_ptr.
1667 cmd->buf_ptr = ping_data;
1668 cmd->buf_ptr_size = payload_length;
1670 pr_debug("Got %u bytes of NOPOUT ping"
1671 " data.\n", payload_length);
1672 pr_debug("Ping Data: \"%s\"\n", ping_data);
1675 if (hdr->itt != RESERVED_ITT) {
1677 pr_err("Checking CmdSN for NOPOUT,"
1678 " but cmd is NULL!\n");
1682 * Initiator is expecting a NopIN ping reply,
1684 spin_lock_bh(&conn->cmd_lock);
1685 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1686 spin_unlock_bh(&conn->cmd_lock);
1688 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1690 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1691 iscsit_add_cmd_to_response_queue(cmd, conn,
1696 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1697 (unsigned char *)hdr, hdr->cmdsn);
1698 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1702 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1708 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1710 * This was a response to a unsolicited NOPIN ping.
1712 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1716 iscsit_stop_nopin_response_timer(conn);
1718 cmd_p->i_state = ISTATE_REMOVE;
1719 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1720 iscsit_start_nopin_timer(conn);
1723 * Initiator is not expecting a NOPIN is response.
1724 * Just ignore for now.
1726 * iSCSI v19-91 10.18
1727 * "A NOP-OUT may also be used to confirm a changed
1728 * ExpStatSN if another PDU will not be available
1738 iscsit_free_cmd(cmd, false);
1743 EXPORT_SYMBOL(iscsit_handle_nop_out);
1746 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1749 struct se_tmr_req *se_tmr;
1750 struct iscsi_tmr_req *tmr_req;
1751 struct iscsi_tm *hdr;
1752 int out_of_order_cmdsn = 0, ret;
1753 bool sess_ref = false;
1756 hdr = (struct iscsi_tm *) buf;
1757 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1758 function = hdr->flags;
1760 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1761 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1762 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1763 hdr->rtt, hdr->refcmdsn, conn->cid);
1765 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1766 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1767 hdr->rtt != RESERVED_ITT)) {
1768 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1769 hdr->rtt = RESERVED_ITT;
1772 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1774 pr_err("Task Management Request TASK_REASSIGN not"
1775 " issued as immediate command, bad iSCSI Initiator"
1776 "implementation\n");
1777 return iscsit_add_reject_cmd(cmd,
1778 ISCSI_REASON_PROTOCOL_ERROR, buf);
1780 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1781 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1782 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1784 cmd->data_direction = DMA_NONE;
1786 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1787 if (!cmd->tmr_req) {
1788 pr_err("Unable to allocate memory for"
1789 " Task Management command!\n");
1790 return iscsit_add_reject_cmd(cmd,
1791 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1796 * TASK_REASSIGN for ERL=2 / connection stays inside of
1797 * LIO-Target $FABRIC_MOD
1799 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1804 transport_init_se_cmd(&cmd->se_cmd,
1805 &lio_target_fabric_configfs->tf_ops,
1806 conn->sess->se_sess, 0, DMA_NONE,
1807 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1809 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1813 case ISCSI_TM_FUNC_ABORT_TASK:
1814 tcm_function = TMR_ABORT_TASK;
1816 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1817 tcm_function = TMR_ABORT_TASK_SET;
1819 case ISCSI_TM_FUNC_CLEAR_ACA:
1820 tcm_function = TMR_CLEAR_ACA;
1822 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1823 tcm_function = TMR_CLEAR_TASK_SET;
1825 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1826 tcm_function = TMR_LUN_RESET;
1828 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1829 tcm_function = TMR_TARGET_WARM_RESET;
1831 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1832 tcm_function = TMR_TARGET_COLD_RESET;
1835 pr_err("Unknown iSCSI TMR Function:"
1836 " 0x%02x\n", function);
1837 return iscsit_add_reject_cmd(cmd,
1838 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1841 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1842 tcm_function, GFP_KERNEL);
1844 return iscsit_add_reject_cmd(cmd,
1845 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1847 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1850 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1851 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1852 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1853 cmd->init_task_tag = hdr->itt;
1854 cmd->targ_xfer_tag = 0xFFFFFFFF;
1855 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1856 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1857 se_tmr = cmd->se_cmd.se_tmr_req;
1858 tmr_req = cmd->tmr_req;
1860 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1862 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1863 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1864 scsilun_to_int(&hdr->lun));
1866 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1872 case ISCSI_TM_FUNC_ABORT_TASK:
1873 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1874 if (se_tmr->response)
1877 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1878 case ISCSI_TM_FUNC_CLEAR_ACA:
1879 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1880 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1882 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1883 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1884 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1888 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1889 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1890 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1894 case ISCSI_TM_FUNC_TASK_REASSIGN:
1895 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1897 * Perform sanity checks on the ExpDataSN only if the
1898 * TASK_REASSIGN was successful.
1900 if (se_tmr->response)
1903 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1904 return iscsit_add_reject_cmd(cmd,
1905 ISCSI_REASON_BOOKMARK_INVALID, buf);
1908 pr_err("Unknown TMR function: 0x%02x, protocol"
1909 " error.\n", function);
1910 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1914 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1915 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1916 se_tmr->call_transport = 1;
1918 spin_lock_bh(&conn->cmd_lock);
1919 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1920 spin_unlock_bh(&conn->cmd_lock);
1922 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1923 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1924 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1925 out_of_order_cmdsn = 1;
1926 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1928 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1931 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1933 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1936 * Found the referenced task, send to transport for processing.
1938 if (se_tmr->call_transport)
1939 return transport_generic_handle_tmr(&cmd->se_cmd);
1942 * Could not find the referenced LUN, task, or Task Management
1943 * command not authorized or supported. Change state and
1944 * let the tx_thread send the response.
1946 * For connection recovery, this is also the default action for
1947 * TMR TASK_REASSIGN.
1950 pr_debug("Handle TMR, using sess_ref=true check\n");
1951 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1954 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1957 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1959 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1960 static int iscsit_handle_text_cmd(
1961 struct iscsi_conn *conn,
1964 char *text_ptr, *text_in;
1965 int cmdsn_ret, niov = 0, rx_got, rx_size;
1966 u32 checksum = 0, data_crc = 0, payload_length;
1967 u32 padding = 0, pad_bytes = 0, text_length = 0;
1968 struct iscsi_cmd *cmd;
1970 struct iscsi_text *hdr;
1972 hdr = (struct iscsi_text *) buf;
1973 payload_length = ntoh24(hdr->dlength);
1975 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1976 pr_err("Unable to accept text parameter length: %u"
1977 "greater than MaxXmitDataSegmentLength %u.\n",
1978 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1979 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1982 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1983 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1984 hdr->exp_statsn, payload_length);
1986 rx_size = text_length = payload_length;
1988 text_in = kzalloc(text_length, GFP_KERNEL);
1990 pr_err("Unable to allocate memory for"
1991 " incoming text parameters\n");
1995 memset(iov, 0, 3 * sizeof(struct kvec));
1996 iov[niov].iov_base = text_in;
1997 iov[niov++].iov_len = text_length;
1999 padding = ((-payload_length) & 3);
2001 iov[niov].iov_base = &pad_bytes;
2002 iov[niov++].iov_len = padding;
2004 pr_debug("Receiving %u additional bytes"
2005 " for padding.\n", padding);
2007 if (conn->conn_ops->DataDigest) {
2008 iov[niov].iov_base = &checksum;
2009 iov[niov++].iov_len = ISCSI_CRC_LEN;
2010 rx_size += ISCSI_CRC_LEN;
2013 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2014 if (rx_got != rx_size) {
2019 if (conn->conn_ops->DataDigest) {
2020 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2021 text_in, text_length,
2022 padding, (u8 *)&pad_bytes,
2025 if (checksum != data_crc) {
2026 pr_err("Text data CRC32C DataDigest"
2027 " 0x%08x does not match computed"
2028 " 0x%08x\n", checksum, data_crc);
2029 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2030 pr_err("Unable to recover from"
2031 " Text Data digest failure while in"
2037 * Silently drop this PDU and let the
2038 * initiator plug the CmdSN gap.
2040 pr_debug("Dropping Text"
2041 " Command CmdSN: 0x%08x due to"
2042 " DataCRC error.\n", hdr->cmdsn);
2047 pr_debug("Got CRC32C DataDigest"
2048 " 0x%08x for %u bytes of text data.\n",
2049 checksum, text_length);
2052 text_in[text_length - 1] = '\0';
2053 pr_debug("Successfully read %d bytes of text"
2054 " data.\n", text_length);
2056 if (strncmp("SendTargets", text_in, 11) != 0) {
2057 pr_err("Received Text Data that is not"
2058 " SendTargets, cannot continue.\n");
2062 text_ptr = strchr(text_in, '=');
2064 pr_err("No \"=\" separator found in Text Data,"
2065 " cannot continue.\n");
2069 if (strncmp("=All", text_ptr, 4) != 0) {
2070 pr_err("Unable to locate All value for"
2071 " SendTargets key, cannot continue.\n");
2075 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2079 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2081 return iscsit_add_reject(conn,
2082 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2084 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2085 cmd->i_state = ISTATE_SEND_TEXTRSP;
2086 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2087 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2088 cmd->targ_xfer_tag = 0xFFFFFFFF;
2089 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2090 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2091 cmd->data_direction = DMA_NONE;
2093 spin_lock_bh(&conn->cmd_lock);
2094 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2095 spin_unlock_bh(&conn->cmd_lock);
2097 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2099 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2100 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2101 (unsigned char *)hdr, hdr->cmdsn);
2102 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2108 return iscsit_execute_cmd(cmd, 0);
2111 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2113 struct iscsi_conn *conn_p;
2114 struct iscsi_session *sess = conn->sess;
2116 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2117 " for SID: %u.\n", conn->cid, conn->sess->sid);
2119 atomic_set(&sess->session_logout, 1);
2120 atomic_set(&conn->conn_logout_remove, 1);
2121 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2123 iscsit_inc_conn_usage_count(conn);
2124 iscsit_inc_session_usage_count(sess);
2126 spin_lock_bh(&sess->conn_lock);
2127 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2128 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2131 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2132 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2134 spin_unlock_bh(&sess->conn_lock);
2136 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2141 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2143 struct iscsi_conn *l_conn;
2144 struct iscsi_session *sess = conn->sess;
2146 pr_debug("Received logout request CLOSECONNECTION for CID:"
2147 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2150 * A Logout Request with a CLOSECONNECTION reason code for a CID
2151 * can arrive on a connection with a differing CID.
2153 if (conn->cid == cmd->logout_cid) {
2154 spin_lock_bh(&conn->state_lock);
2155 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2156 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2158 atomic_set(&conn->conn_logout_remove, 1);
2159 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2160 iscsit_inc_conn_usage_count(conn);
2162 spin_unlock_bh(&conn->state_lock);
2165 * Handle all different cid CLOSECONNECTION requests in
2166 * iscsit_logout_post_handler_diffcid() as to give enough
2167 * time for any non immediate command's CmdSN to be
2168 * acknowledged on the connection in question.
2170 * Here we simply make sure the CID is still around.
2172 l_conn = iscsit_get_conn_from_cid(sess,
2175 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2176 iscsit_add_cmd_to_response_queue(cmd, conn,
2181 iscsit_dec_conn_usage_count(l_conn);
2184 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2189 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191 struct iscsi_session *sess = conn->sess;
2193 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2194 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2196 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2197 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2198 " while ERL!=2.\n");
2199 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2200 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2204 if (conn->cid == cmd->logout_cid) {
2205 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2206 " with CID: %hu on CID: %hu, implementation error.\n",
2207 cmd->logout_cid, conn->cid);
2208 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2209 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2213 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2219 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2222 int cmdsn_ret, logout_remove = 0;
2224 struct iscsi_logout *hdr;
2225 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2227 hdr = (struct iscsi_logout *) buf;
2228 reason_code = (hdr->flags & 0x7f);
2231 spin_lock(&tiqn->logout_stats.lock);
2232 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2233 tiqn->logout_stats.normal_logouts++;
2235 tiqn->logout_stats.abnormal_logouts++;
2236 spin_unlock(&tiqn->logout_stats.lock);
2239 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2240 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2241 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2242 hdr->cid, conn->cid);
2244 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2245 pr_err("Received logout request on connection that"
2246 " is not in logged in state, ignoring request.\n");
2247 iscsit_free_cmd(cmd, false);
2251 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2252 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2253 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2254 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2255 cmd->targ_xfer_tag = 0xFFFFFFFF;
2256 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2257 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2258 cmd->logout_cid = be16_to_cpu(hdr->cid);
2259 cmd->logout_reason = reason_code;
2260 cmd->data_direction = DMA_NONE;
2263 * We need to sleep in these cases (by returning 1) until the Logout
2264 * Response gets sent in the tx thread.
2266 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2267 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2268 be16_to_cpu(hdr->cid) == conn->cid))
2271 spin_lock_bh(&conn->cmd_lock);
2272 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2273 spin_unlock_bh(&conn->cmd_lock);
2275 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2276 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2279 * Immediate commands are executed, well, immediately.
2280 * Non-Immediate Logout Commands are executed in CmdSN order.
2282 if (cmd->immediate_cmd) {
2283 int ret = iscsit_execute_cmd(cmd, 0);
2288 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2289 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2291 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2295 return logout_remove;
2297 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2299 static int iscsit_handle_snack(
2300 struct iscsi_conn *conn,
2303 struct iscsi_snack *hdr;
2305 hdr = (struct iscsi_snack *) buf;
2306 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2308 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2309 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2310 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2311 hdr->begrun, hdr->runlength, conn->cid);
2313 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2314 pr_err("Initiator sent SNACK request while in"
2315 " ErrorRecoveryLevel=0.\n");
2316 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2320 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2321 * call from inside iscsi_send_recovery_datain_or_r2t().
2323 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2325 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2327 be32_to_cpu(hdr->ttt),
2328 be32_to_cpu(hdr->begrun),
2329 be32_to_cpu(hdr->runlength));
2330 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2331 return iscsit_handle_status_snack(conn, hdr->itt,
2332 be32_to_cpu(hdr->ttt),
2333 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2334 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2335 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2336 be32_to_cpu(hdr->begrun),
2337 be32_to_cpu(hdr->runlength));
2338 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2339 /* FIXME: Support R-Data SNACK */
2340 pr_err("R-Data SNACK Not Supported.\n");
2341 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2344 pr_err("Unknown SNACK type 0x%02x, protocol"
2345 " error.\n", hdr->flags & 0x0f);
2346 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2353 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2355 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2356 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2357 wait_for_completion_interruptible_timeout(
2358 &conn->rx_half_close_comp,
2359 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2363 static int iscsit_handle_immediate_data(
2364 struct iscsi_cmd *cmd,
2365 struct iscsi_scsi_req *hdr,
2368 int iov_ret, rx_got = 0, rx_size = 0;
2369 u32 checksum, iov_count = 0, padding = 0;
2370 struct iscsi_conn *conn = cmd->conn;
2373 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2375 return IMMEDIATE_DATA_CANNOT_RECOVER;
2378 iov_count = iov_ret;
2379 iov = &cmd->iov_data[0];
2381 padding = ((-length) & 3);
2383 iov[iov_count].iov_base = cmd->pad_bytes;
2384 iov[iov_count++].iov_len = padding;
2388 if (conn->conn_ops->DataDigest) {
2389 iov[iov_count].iov_base = &checksum;
2390 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2391 rx_size += ISCSI_CRC_LEN;
2394 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2396 iscsit_unmap_iovec(cmd);
2398 if (rx_got != rx_size) {
2399 iscsit_rx_thread_wait_for_tcp(conn);
2400 return IMMEDIATE_DATA_CANNOT_RECOVER;
2403 if (conn->conn_ops->DataDigest) {
2406 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2407 cmd->write_data_done, length, padding,
2410 if (checksum != data_crc) {
2411 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2412 " does not match computed 0x%08x\n", checksum,
2415 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2416 pr_err("Unable to recover from"
2417 " Immediate Data digest failure while"
2419 iscsit_reject_cmd(cmd,
2420 ISCSI_REASON_DATA_DIGEST_ERROR,
2421 (unsigned char *)hdr);
2422 return IMMEDIATE_DATA_CANNOT_RECOVER;
2424 iscsit_reject_cmd(cmd,
2425 ISCSI_REASON_DATA_DIGEST_ERROR,
2426 (unsigned char *)hdr);
2427 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2430 pr_debug("Got CRC32C DataDigest 0x%08x for"
2431 " %u bytes of Immediate Data\n", checksum,
2436 cmd->write_data_done += length;
2438 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2439 spin_lock_bh(&cmd->istate_lock);
2440 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2441 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2442 spin_unlock_bh(&cmd->istate_lock);
2445 return IMMEDIATE_DATA_NORMAL_OPERATION;
2449 * Called with sess->conn_lock held.
2451 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2452 with active network interface */
2453 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2455 struct iscsi_cmd *cmd;
2456 struct iscsi_conn *conn_p;
2460 * Only send a Asynchronous Message on connections whos network
2461 * interface is still functional.
2463 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2464 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2465 iscsit_inc_conn_usage_count(conn_p);
2474 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2476 iscsit_dec_conn_usage_count(conn_p);
2480 cmd->logout_cid = conn->cid;
2481 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2482 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2484 spin_lock_bh(&conn_p->cmd_lock);
2485 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2486 spin_unlock_bh(&conn_p->cmd_lock);
2488 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2489 iscsit_dec_conn_usage_count(conn_p);
2492 static int iscsit_send_conn_drop_async_message(
2493 struct iscsi_cmd *cmd,
2494 struct iscsi_conn *conn)
2496 struct iscsi_async *hdr;
2498 cmd->tx_size = ISCSI_HDR_LEN;
2499 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2501 hdr = (struct iscsi_async *) cmd->pdu;
2502 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2503 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2504 cmd->init_task_tag = RESERVED_ITT;
2505 cmd->targ_xfer_tag = 0xFFFFFFFF;
2506 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2507 cmd->stat_sn = conn->stat_sn++;
2508 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2509 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2510 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2511 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2512 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2513 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2514 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2516 if (conn->conn_ops->HeaderDigest) {
2517 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2519 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2520 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2522 cmd->tx_size += ISCSI_CRC_LEN;
2523 pr_debug("Attaching CRC32C HeaderDigest to"
2524 " Async Message 0x%08x\n", *header_digest);
2527 cmd->iov_misc[0].iov_base = cmd->pdu;
2528 cmd->iov_misc[0].iov_len = cmd->tx_size;
2529 cmd->iov_misc_count = 1;
2531 pr_debug("Sending Connection Dropped Async Message StatSN:"
2532 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2533 cmd->logout_cid, conn->cid);
2537 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2539 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2540 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2541 wait_for_completion_interruptible_timeout(
2542 &conn->tx_half_close_comp,
2543 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2548 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2549 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2552 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2553 hdr->flags = datain->flags;
2554 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2555 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2556 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2557 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2558 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2559 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2560 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2563 hton24(hdr->dlength, datain->length);
2564 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2565 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2566 (struct scsi_lun *)&hdr->lun);
2568 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2570 hdr->itt = cmd->init_task_tag;
2572 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2573 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2575 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2577 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2579 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2581 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2582 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2583 hdr->datasn = cpu_to_be32(datain->data_sn);
2584 hdr->offset = cpu_to_be32(datain->offset);
2586 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2587 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2588 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2589 ntohl(hdr->offset), datain->length, conn->cid);
2592 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2594 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2595 struct iscsi_datain datain;
2596 struct iscsi_datain_req *dr;
2598 u32 iov_count = 0, tx_size = 0;
2599 int eodr = 0, ret, iov_ret;
2600 bool set_statsn = false;
2602 memset(&datain, 0, sizeof(struct iscsi_datain));
2603 dr = iscsit_get_datain_values(cmd, &datain);
2605 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2606 cmd->init_task_tag);
2610 * Be paranoid and double check the logic for now.
2612 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2613 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2614 " datain.length: %u exceeds cmd->data_length: %u\n",
2615 cmd->init_task_tag, datain.offset, datain.length,
2616 cmd->se_cmd.data_length);
2620 spin_lock_bh(&conn->sess->session_stats_lock);
2621 conn->sess->tx_data_octets += datain.length;
2622 if (conn->sess->se_sess->se_node_acl) {
2623 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2624 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2625 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2627 spin_unlock_bh(&conn->sess->session_stats_lock);
2629 * Special case for successfully execution w/ both DATAIN
2632 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2633 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2634 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2636 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2637 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2638 iscsit_increment_maxcmdsn(cmd, conn->sess);
2639 cmd->stat_sn = conn->stat_sn++;
2641 } else if (dr->dr_complete ==
2642 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2646 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2648 iov = &cmd->iov_data[0];
2649 iov[iov_count].iov_base = cmd->pdu;
2650 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2651 tx_size += ISCSI_HDR_LEN;
2653 if (conn->conn_ops->HeaderDigest) {
2654 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2656 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2657 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2659 iov[0].iov_len += ISCSI_CRC_LEN;
2660 tx_size += ISCSI_CRC_LEN;
2662 pr_debug("Attaching CRC32 HeaderDigest"
2663 " for DataIN PDU 0x%08x\n", *header_digest);
2666 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2667 datain.offset, datain.length);
2671 iov_count += iov_ret;
2672 tx_size += datain.length;
2674 cmd->padding = ((-datain.length) & 3);
2676 iov[iov_count].iov_base = cmd->pad_bytes;
2677 iov[iov_count++].iov_len = cmd->padding;
2678 tx_size += cmd->padding;
2680 pr_debug("Attaching %u padding bytes\n",
2683 if (conn->conn_ops->DataDigest) {
2684 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2685 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2687 iov[iov_count].iov_base = &cmd->data_crc;
2688 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2689 tx_size += ISCSI_CRC_LEN;
2691 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2692 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2695 cmd->iov_data_count = iov_count;
2696 cmd->tx_size = tx_size;
2698 /* sendpage is preferred but can't insert markers */
2699 if (!conn->conn_ops->IFMarker)
2700 ret = iscsit_fe_sendpage_sg(cmd, conn);
2702 ret = iscsit_send_tx_data(cmd, conn, 0);
2704 iscsit_unmap_iovec(cmd);
2707 iscsit_tx_thread_wait_for_tcp(conn);
2711 if (dr->dr_complete) {
2712 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2714 iscsit_free_datain_req(cmd, dr);
2721 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2722 struct iscsi_logout_rsp *hdr)
2724 struct iscsi_conn *logout_conn = NULL;
2725 struct iscsi_conn_recovery *cr = NULL;
2726 struct iscsi_session *sess = conn->sess;
2728 * The actual shutting down of Sessions and/or Connections
2729 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2730 * is done in scsi_logout_post_handler().
2732 switch (cmd->logout_reason) {
2733 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2734 pr_debug("iSCSI session logout successful, setting"
2735 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2736 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2738 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2739 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2742 * For CLOSECONNECTION logout requests carrying
2743 * a matching logout CID -> local CID, the reference
2744 * for the local CID will have been incremented in
2745 * iscsi_logout_closeconnection().
2747 * For CLOSECONNECTION logout requests carrying
2748 * a different CID than the connection it arrived
2749 * on, the connection responding to cmd->logout_cid
2750 * is stopped in iscsit_logout_post_handler_diffcid().
2753 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2754 " successful.\n", cmd->logout_cid, conn->cid);
2755 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2757 case ISCSI_LOGOUT_REASON_RECOVERY:
2758 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2759 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2762 * If the connection is still active from our point of view
2763 * force connection recovery to occur.
2765 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2768 iscsit_connection_reinstatement_rcfr(logout_conn);
2769 iscsit_dec_conn_usage_count(logout_conn);
2772 cr = iscsit_get_inactive_connection_recovery_entry(
2773 conn->sess, cmd->logout_cid);
2775 pr_err("Unable to locate CID: %hu for"
2776 " REMOVECONNFORRECOVERY Logout Request.\n",
2778 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2782 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2784 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2785 " for recovery for CID: %hu on CID: %hu successful.\n",
2786 cmd->logout_cid, conn->cid);
2787 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2790 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2791 cmd->logout_reason);
2795 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2796 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2797 hdr->response = cmd->logout_response;
2798 hdr->itt = cmd->init_task_tag;
2799 cmd->stat_sn = conn->stat_sn++;
2800 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2802 iscsit_increment_maxcmdsn(cmd, conn->sess);
2803 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2804 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2806 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2807 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2808 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2809 cmd->logout_cid, conn->cid);
2813 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2816 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2819 int niov = 0, tx_size, rc;
2821 rc = iscsit_build_logout_rsp(cmd, conn,
2822 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2826 tx_size = ISCSI_HDR_LEN;
2827 iov = &cmd->iov_misc[0];
2828 iov[niov].iov_base = cmd->pdu;
2829 iov[niov++].iov_len = ISCSI_HDR_LEN;
2831 if (conn->conn_ops->HeaderDigest) {
2832 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2834 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2835 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2837 iov[0].iov_len += ISCSI_CRC_LEN;
2838 tx_size += ISCSI_CRC_LEN;
2839 pr_debug("Attaching CRC32C HeaderDigest to"
2840 " Logout Response 0x%08x\n", *header_digest);
2842 cmd->iov_misc_count = niov;
2843 cmd->tx_size = tx_size;
2849 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2850 struct iscsi_nopin *hdr, bool nopout_response)
2852 hdr->opcode = ISCSI_OP_NOOP_IN;
2853 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2854 hton24(hdr->dlength, cmd->buf_ptr_size);
2855 if (nopout_response)
2856 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2857 hdr->itt = cmd->init_task_tag;
2858 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2859 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2861 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2863 if (nopout_response)
2864 iscsit_increment_maxcmdsn(cmd, conn->sess);
2866 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2867 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2869 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2870 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2871 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2872 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2874 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2877 * Unsolicited NOPIN, either requesting a response or not.
2879 static int iscsit_send_unsolicited_nopin(
2880 struct iscsi_cmd *cmd,
2881 struct iscsi_conn *conn,
2884 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2885 int tx_size = ISCSI_HDR_LEN, ret;
2887 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2889 if (conn->conn_ops->HeaderDigest) {
2890 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2892 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2893 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2895 tx_size += ISCSI_CRC_LEN;
2896 pr_debug("Attaching CRC32C HeaderDigest to"
2897 " NopIN 0x%08x\n", *header_digest);
2900 cmd->iov_misc[0].iov_base = cmd->pdu;
2901 cmd->iov_misc[0].iov_len = tx_size;
2902 cmd->iov_misc_count = 1;
2903 cmd->tx_size = tx_size;
2905 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2906 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2908 ret = iscsit_send_tx_data(cmd, conn, 1);
2910 iscsit_tx_thread_wait_for_tcp(conn);
2914 spin_lock_bh(&cmd->istate_lock);
2915 cmd->i_state = want_response ?
2916 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2917 spin_unlock_bh(&cmd->istate_lock);
2923 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2925 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2928 int niov = 0, tx_size;
2930 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2932 tx_size = ISCSI_HDR_LEN;
2933 iov = &cmd->iov_misc[0];
2934 iov[niov].iov_base = cmd->pdu;
2935 iov[niov++].iov_len = ISCSI_HDR_LEN;
2937 if (conn->conn_ops->HeaderDigest) {
2938 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2940 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2941 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2943 iov[0].iov_len += ISCSI_CRC_LEN;
2944 tx_size += ISCSI_CRC_LEN;
2945 pr_debug("Attaching CRC32C HeaderDigest"
2946 " to NopIn 0x%08x\n", *header_digest);
2950 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2951 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2953 if (cmd->buf_ptr_size) {
2954 iov[niov].iov_base = cmd->buf_ptr;
2955 iov[niov++].iov_len = cmd->buf_ptr_size;
2956 tx_size += cmd->buf_ptr_size;
2958 pr_debug("Echoing back %u bytes of ping"
2959 " data.\n", cmd->buf_ptr_size);
2961 padding = ((-cmd->buf_ptr_size) & 3);
2963 iov[niov].iov_base = &cmd->pad_bytes;
2964 iov[niov++].iov_len = padding;
2966 pr_debug("Attaching %u additional"
2967 " padding bytes.\n", padding);
2969 if (conn->conn_ops->DataDigest) {
2970 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2971 cmd->buf_ptr, cmd->buf_ptr_size,
2972 padding, (u8 *)&cmd->pad_bytes,
2973 (u8 *)&cmd->data_crc);
2975 iov[niov].iov_base = &cmd->data_crc;
2976 iov[niov++].iov_len = ISCSI_CRC_LEN;
2977 tx_size += ISCSI_CRC_LEN;
2978 pr_debug("Attached DataDigest for %u"
2979 " bytes of ping data, CRC 0x%08x\n",
2980 cmd->buf_ptr_size, cmd->data_crc);
2984 cmd->iov_misc_count = niov;
2985 cmd->tx_size = tx_size;
2990 static int iscsit_send_r2t(
2991 struct iscsi_cmd *cmd,
2992 struct iscsi_conn *conn)
2995 struct iscsi_r2t *r2t;
2996 struct iscsi_r2t_rsp *hdr;
2999 r2t = iscsit_get_r2t_from_list(cmd);
3003 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3004 memset(hdr, 0, ISCSI_HDR_LEN);
3005 hdr->opcode = ISCSI_OP_R2T;
3006 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3007 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3008 (struct scsi_lun *)&hdr->lun);
3009 hdr->itt = cmd->init_task_tag;
3010 spin_lock_bh(&conn->sess->ttt_lock);
3011 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3012 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3013 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3014 spin_unlock_bh(&conn->sess->ttt_lock);
3015 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3016 hdr->statsn = cpu_to_be32(conn->stat_sn);
3017 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3018 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3019 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3020 hdr->data_offset = cpu_to_be32(r2t->offset);
3021 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3023 cmd->iov_misc[0].iov_base = cmd->pdu;
3024 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3025 tx_size += ISCSI_HDR_LEN;
3027 if (conn->conn_ops->HeaderDigest) {
3028 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3030 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3031 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3033 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3034 tx_size += ISCSI_CRC_LEN;
3035 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3036 " PDU 0x%08x\n", *header_digest);
3039 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3040 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3041 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3042 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3043 r2t->offset, r2t->xfer_len, conn->cid);
3045 cmd->iov_misc_count = 1;
3046 cmd->tx_size = tx_size;
3048 spin_lock_bh(&cmd->r2t_lock);
3050 spin_unlock_bh(&cmd->r2t_lock);
3052 ret = iscsit_send_tx_data(cmd, conn, 1);
3054 iscsit_tx_thread_wait_for_tcp(conn);
3058 spin_lock_bh(&cmd->dataout_timeout_lock);
3059 iscsit_start_dataout_timer(cmd, conn);
3060 spin_unlock_bh(&cmd->dataout_timeout_lock);
3066 * @recovery: If called from iscsi_task_reassign_complete_write() for
3067 * connection recovery.
3069 int iscsit_build_r2ts_for_cmd(
3070 struct iscsi_conn *conn,
3071 struct iscsi_cmd *cmd,
3075 u32 offset = 0, xfer_len = 0;
3077 spin_lock_bh(&cmd->r2t_lock);
3078 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3079 spin_unlock_bh(&cmd->r2t_lock);
3083 if (conn->sess->sess_ops->DataSequenceInOrder &&
3085 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3087 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3088 if (conn->sess->sess_ops->DataSequenceInOrder) {
3089 offset = cmd->r2t_offset;
3091 if (first_r2t && recovery) {
3092 int new_data_end = offset +
3093 conn->sess->sess_ops->MaxBurstLength -
3094 cmd->next_burst_len;
3096 if (new_data_end > cmd->se_cmd.data_length)
3097 xfer_len = cmd->se_cmd.data_length - offset;
3100 conn->sess->sess_ops->MaxBurstLength -
3101 cmd->next_burst_len;
3103 int new_data_end = offset +
3104 conn->sess->sess_ops->MaxBurstLength;
3106 if (new_data_end > cmd->se_cmd.data_length)
3107 xfer_len = cmd->se_cmd.data_length - offset;
3109 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3111 cmd->r2t_offset += xfer_len;
3113 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3114 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3116 struct iscsi_seq *seq;
3118 seq = iscsit_get_seq_holder_for_r2t(cmd);
3120 spin_unlock_bh(&cmd->r2t_lock);
3124 offset = seq->offset;
3125 xfer_len = seq->xfer_len;
3127 if (cmd->seq_send_order == cmd->seq_count)
3128 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3130 cmd->outstanding_r2ts++;
3133 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3134 spin_unlock_bh(&cmd->r2t_lock);
3138 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3141 spin_unlock_bh(&cmd->r2t_lock);
3146 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3147 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3150 cmd->stat_sn = conn->stat_sn++;
3152 spin_lock_bh(&conn->sess->session_stats_lock);
3153 conn->sess->rsp_pdus++;
3154 spin_unlock_bh(&conn->sess->session_stats_lock);
3156 memset(hdr, 0, ISCSI_HDR_LEN);
3157 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3158 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3159 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3160 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3161 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3162 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3163 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3164 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3166 hdr->response = cmd->iscsi_response;
3167 hdr->cmd_status = cmd->se_cmd.scsi_status;
3168 hdr->itt = cmd->init_task_tag;
3169 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3171 iscsit_increment_maxcmdsn(cmd, conn->sess);
3172 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3173 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3175 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3176 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3177 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3178 cmd->se_cmd.scsi_status, conn->cid);
3180 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3182 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3184 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3186 u32 padding = 0, tx_size = 0;
3188 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3190 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3192 iov = &cmd->iov_misc[0];
3193 iov[iov_count].iov_base = cmd->pdu;
3194 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3195 tx_size += ISCSI_HDR_LEN;
3198 * Attach SENSE DATA payload to iSCSI Response PDU
3200 if (cmd->se_cmd.sense_buffer &&
3201 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3202 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3203 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3204 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3206 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3207 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3208 iov[iov_count].iov_base = cmd->sense_buffer;
3209 iov[iov_count++].iov_len =
3210 (cmd->se_cmd.scsi_sense_length + padding);
3211 tx_size += cmd->se_cmd.scsi_sense_length;
3214 memset(cmd->sense_buffer +
3215 cmd->se_cmd.scsi_sense_length, 0, padding);
3217 pr_debug("Adding %u bytes of padding to"
3218 " SENSE.\n", padding);
3221 if (conn->conn_ops->DataDigest) {
3222 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3224 (cmd->se_cmd.scsi_sense_length + padding),
3225 0, NULL, (u8 *)&cmd->data_crc);
3227 iov[iov_count].iov_base = &cmd->data_crc;
3228 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3229 tx_size += ISCSI_CRC_LEN;
3231 pr_debug("Attaching CRC32 DataDigest for"
3232 " SENSE, %u bytes CRC 0x%08x\n",
3233 (cmd->se_cmd.scsi_sense_length + padding),
3237 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3239 cmd->se_cmd.scsi_sense_length);
3242 if (conn->conn_ops->HeaderDigest) {
3243 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3245 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3246 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3248 iov[0].iov_len += ISCSI_CRC_LEN;
3249 tx_size += ISCSI_CRC_LEN;
3250 pr_debug("Attaching CRC32 HeaderDigest for Response"
3251 " PDU 0x%08x\n", *header_digest);
3254 cmd->iov_misc_count = iov_count;
3255 cmd->tx_size = tx_size;
3260 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3262 switch (se_tmr->response) {
3263 case TMR_FUNCTION_COMPLETE:
3264 return ISCSI_TMF_RSP_COMPLETE;
3265 case TMR_TASK_DOES_NOT_EXIST:
3266 return ISCSI_TMF_RSP_NO_TASK;
3267 case TMR_LUN_DOES_NOT_EXIST:
3268 return ISCSI_TMF_RSP_NO_LUN;
3269 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3270 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3271 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3272 return ISCSI_TMF_RSP_AUTH_FAILED;
3273 case TMR_FUNCTION_REJECTED:
3275 return ISCSI_TMF_RSP_REJECTED;
3280 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3281 struct iscsi_tm_rsp *hdr)
3283 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3285 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3286 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3287 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3288 hdr->itt = cmd->init_task_tag;
3289 cmd->stat_sn = conn->stat_sn++;
3290 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3292 iscsit_increment_maxcmdsn(cmd, conn->sess);
3293 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3294 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3296 pr_debug("Built Task Management Response ITT: 0x%08x,"
3297 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3298 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3300 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3303 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3305 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3308 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3310 cmd->iov_misc[0].iov_base = cmd->pdu;
3311 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3312 tx_size += ISCSI_HDR_LEN;
3314 if (conn->conn_ops->HeaderDigest) {
3315 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3317 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3318 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3320 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3321 tx_size += ISCSI_CRC_LEN;
3322 pr_debug("Attaching CRC32 HeaderDigest for Task"
3323 " Mgmt Response PDU 0x%08x\n", *header_digest);
3326 cmd->iov_misc_count = 1;
3327 cmd->tx_size = tx_size;
3332 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3336 if (np->np_sockaddr.ss_family == AF_INET6) {
3337 const struct sockaddr_in6 sin6 = {
3338 .sin6_addr = IN6ADDR_ANY_INIT };
3339 struct sockaddr_in6 *sock_in6 =
3340 (struct sockaddr_in6 *)&np->np_sockaddr;
3342 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3343 sin6.sin6_addr.s6_addr, 16))
3346 struct sockaddr_in * sock_in =
3347 (struct sockaddr_in *)&np->np_sockaddr;
3349 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3356 #define SENDTARGETS_BUF_LIMIT 32768U
3358 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3360 char *payload = NULL;
3361 struct iscsi_conn *conn = cmd->conn;
3362 struct iscsi_portal_group *tpg;
3363 struct iscsi_tiqn *tiqn;
3364 struct iscsi_tpg_np *tpg_np;
3365 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3366 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3368 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3369 SENDTARGETS_BUF_LIMIT);
3371 payload = kzalloc(buffer_len, GFP_KERNEL);
3373 pr_err("Unable to allocate memory for sendtargets"
3378 spin_lock(&tiqn_lock);
3379 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3380 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3383 if ((len + payload_len) > buffer_len) {
3387 memcpy(payload + payload_len, buf, len);
3390 spin_lock(&tiqn->tiqn_tpg_lock);
3391 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3393 spin_lock(&tpg->tpg_state_lock);
3394 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3395 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3396 spin_unlock(&tpg->tpg_state_lock);
3399 spin_unlock(&tpg->tpg_state_lock);
3401 spin_lock(&tpg->tpg_np_lock);
3402 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3404 struct iscsi_np *np = tpg_np->tpg_np;
3405 bool inaddr_any = iscsit_check_inaddr_any(np);
3407 len = sprintf(buf, "TargetAddress="
3409 (np->np_sockaddr.ss_family == AF_INET6) ?
3410 "[" : "", (inaddr_any == false) ?
3411 np->np_ip : conn->local_ip,
3412 (np->np_sockaddr.ss_family == AF_INET6) ?
3413 "]" : "", (inaddr_any == false) ?
3414 np->np_port : conn->local_port,
3418 if ((len + payload_len) > buffer_len) {
3419 spin_unlock(&tpg->tpg_np_lock);
3420 spin_unlock(&tiqn->tiqn_tpg_lock);
3424 memcpy(payload + payload_len, buf, len);
3427 spin_unlock(&tpg->tpg_np_lock);
3429 spin_unlock(&tiqn->tiqn_tpg_lock);
3434 spin_unlock(&tiqn_lock);
3436 cmd->buf_ptr = payload;
3442 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3443 * MaxRecvDataSegmentLength.
3445 static int iscsit_send_text_rsp(
3446 struct iscsi_cmd *cmd,
3447 struct iscsi_conn *conn)
3449 struct iscsi_text_rsp *hdr;
3451 u32 padding = 0, tx_size = 0;
3452 int text_length, iov_count = 0;
3454 text_length = iscsit_build_sendtargets_response(cmd);
3455 if (text_length < 0)
3458 padding = ((-text_length) & 3);
3460 memset(cmd->buf_ptr + text_length, 0, padding);
3461 pr_debug("Attaching %u additional bytes for"
3462 " padding.\n", padding);
3465 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3466 memset(hdr, 0, ISCSI_HDR_LEN);
3467 hdr->opcode = ISCSI_OP_TEXT_RSP;
3468 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3469 hton24(hdr->dlength, text_length);
3470 hdr->itt = cmd->init_task_tag;
3471 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3472 cmd->stat_sn = conn->stat_sn++;
3473 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3475 iscsit_increment_maxcmdsn(cmd, conn->sess);
3476 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3477 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3479 iov = &cmd->iov_misc[0];
3481 iov[iov_count].iov_base = cmd->pdu;
3482 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3483 iov[iov_count].iov_base = cmd->buf_ptr;
3484 iov[iov_count++].iov_len = text_length + padding;
3486 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3488 if (conn->conn_ops->HeaderDigest) {
3489 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3491 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3492 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3494 iov[0].iov_len += ISCSI_CRC_LEN;
3495 tx_size += ISCSI_CRC_LEN;
3496 pr_debug("Attaching CRC32 HeaderDigest for"
3497 " Text Response PDU 0x%08x\n", *header_digest);
3500 if (conn->conn_ops->DataDigest) {
3501 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3502 cmd->buf_ptr, (text_length + padding),
3503 0, NULL, (u8 *)&cmd->data_crc);
3505 iov[iov_count].iov_base = &cmd->data_crc;
3506 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3507 tx_size += ISCSI_CRC_LEN;
3509 pr_debug("Attaching DataDigest for %u bytes of text"
3510 " data, CRC 0x%08x\n", (text_length + padding),
3514 cmd->iov_misc_count = iov_count;
3515 cmd->tx_size = tx_size;
3517 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3518 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3519 text_length, conn->cid);
3524 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3525 struct iscsi_reject *hdr)
3527 hdr->opcode = ISCSI_OP_REJECT;
3528 hdr->reason = cmd->reject_reason;
3529 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3530 hton24(hdr->dlength, ISCSI_HDR_LEN);
3531 hdr->ffffffff = cpu_to_be32(0xffffffff);
3532 cmd->stat_sn = conn->stat_sn++;
3533 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3534 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3535 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3538 EXPORT_SYMBOL(iscsit_build_reject);
3540 static int iscsit_send_reject(
3541 struct iscsi_cmd *cmd,
3542 struct iscsi_conn *conn)
3544 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3546 u32 iov_count = 0, tx_size;
3548 iscsit_build_reject(cmd, conn, hdr);
3550 iov = &cmd->iov_misc[0];
3551 iov[iov_count].iov_base = cmd->pdu;
3552 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3553 iov[iov_count].iov_base = cmd->buf_ptr;
3554 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3556 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3558 if (conn->conn_ops->HeaderDigest) {
3559 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3561 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3562 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3564 iov[0].iov_len += ISCSI_CRC_LEN;
3565 tx_size += ISCSI_CRC_LEN;
3566 pr_debug("Attaching CRC32 HeaderDigest for"
3567 " REJECT PDU 0x%08x\n", *header_digest);
3570 if (conn->conn_ops->DataDigest) {
3571 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3572 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3574 iov[iov_count].iov_base = &cmd->data_crc;
3575 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3576 tx_size += ISCSI_CRC_LEN;
3577 pr_debug("Attaching CRC32 DataDigest for REJECT"
3578 " PDU 0x%08x\n", cmd->data_crc);
3581 cmd->iov_misc_count = iov_count;
3582 cmd->tx_size = tx_size;
3584 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3585 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3590 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3592 struct iscsi_thread_set *ts = conn->thread_set;
3595 * thread_id is assigned from iscsit_global->ts_bitmap from
3596 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3598 * Here we use thread_id to determine which CPU that this
3599 * iSCSI connection's iscsi_thread_set will be scheduled to
3602 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3603 for_each_online_cpu(cpu) {
3605 cpumask_set_cpu(cpu, conn->conn_cpumask);
3610 * This should never be reached..
3613 cpumask_setall(conn->conn_cpumask);
3616 static inline void iscsit_thread_check_cpumask(
3617 struct iscsi_conn *conn,
3618 struct task_struct *p,
3623 * mode == 1 signals iscsi_target_tx_thread() usage.
3624 * mode == 0 signals iscsi_target_rx_thread() usage.
3627 if (!conn->conn_tx_reset_cpumask)
3629 conn->conn_tx_reset_cpumask = 0;
3631 if (!conn->conn_rx_reset_cpumask)
3633 conn->conn_rx_reset_cpumask = 0;
3636 * Update the CPU mask for this single kthread so that
3637 * both TX and RX kthreads are scheduled to run on the
3640 memset(buf, 0, 128);
3641 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3642 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3646 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3651 case ISTATE_SEND_R2T:
3652 ret = iscsit_send_r2t(cmd, conn);
3657 spin_lock_bh(&conn->cmd_lock);
3658 list_del_init(&cmd->i_conn_node);
3659 spin_unlock_bh(&conn->cmd_lock);
3661 iscsit_free_cmd(cmd, false);
3663 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3664 iscsit_mod_nopin_response_timer(conn);
3665 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3669 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3670 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3675 pr_err("Unknown Opcode: 0x%02x ITT:"
3676 " 0x%08x, i_state: %d on CID: %hu\n",
3677 cmd->iscsi_opcode, cmd->init_task_tag, state,
3689 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3691 struct iscsit_transport *t = conn->conn_transport;
3692 struct iscsi_queue_req *qr;
3693 struct iscsi_cmd *cmd;
3697 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3698 atomic_set(&conn->check_immediate_queue, 0);
3701 kmem_cache_free(lio_qr_cache, qr);
3703 ret = t->iscsit_immediate_queue(conn, cmd, state);
3712 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3718 case ISTATE_SEND_DATAIN:
3719 ret = iscsit_send_datain(cmd, conn);
3724 goto check_rsp_state;
3725 else if (ret == 1) {
3727 spin_lock_bh(&cmd->istate_lock);
3728 cmd->i_state = ISTATE_SENT_STATUS;
3729 spin_unlock_bh(&cmd->istate_lock);
3731 if (atomic_read(&conn->check_immediate_queue))
3735 } else if (ret == 2) {
3736 /* Still must send status,
3737 SCF_TRANSPORT_TASK_SENSE was set */
3738 spin_lock_bh(&cmd->istate_lock);
3739 cmd->i_state = ISTATE_SEND_STATUS;
3740 spin_unlock_bh(&cmd->istate_lock);
3741 state = ISTATE_SEND_STATUS;
3742 goto check_rsp_state;
3746 case ISTATE_SEND_STATUS:
3747 case ISTATE_SEND_STATUS_RECOVERY:
3748 ret = iscsit_send_response(cmd, conn);
3750 case ISTATE_SEND_LOGOUTRSP:
3751 ret = iscsit_send_logout(cmd, conn);
3753 case ISTATE_SEND_ASYNCMSG:
3754 ret = iscsit_send_conn_drop_async_message(
3757 case ISTATE_SEND_NOPIN:
3758 ret = iscsit_send_nopin(cmd, conn);
3760 case ISTATE_SEND_REJECT:
3761 ret = iscsit_send_reject(cmd, conn);
3763 case ISTATE_SEND_TASKMGTRSP:
3764 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3767 ret = iscsit_tmr_post_handler(cmd, conn);
3769 iscsit_fall_back_to_erl0(conn->sess);
3771 case ISTATE_SEND_TEXTRSP:
3772 ret = iscsit_send_text_rsp(cmd, conn);
3775 pr_err("Unknown Opcode: 0x%02x ITT:"
3776 " 0x%08x, i_state: %d on CID: %hu\n",
3777 cmd->iscsi_opcode, cmd->init_task_tag,
3784 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3785 iscsit_tx_thread_wait_for_tcp(conn);
3786 iscsit_unmap_iovec(cmd);
3789 iscsit_unmap_iovec(cmd);
3792 case ISTATE_SEND_LOGOUTRSP:
3793 if (!iscsit_logout_post_handler(cmd, conn))
3796 case ISTATE_SEND_STATUS:
3797 case ISTATE_SEND_ASYNCMSG:
3798 case ISTATE_SEND_NOPIN:
3799 case ISTATE_SEND_STATUS_RECOVERY:
3800 case ISTATE_SEND_TEXTRSP:
3801 case ISTATE_SEND_TASKMGTRSP:
3802 case ISTATE_SEND_REJECT:
3803 spin_lock_bh(&cmd->istate_lock);
3804 cmd->i_state = ISTATE_SENT_STATUS;
3805 spin_unlock_bh(&cmd->istate_lock);
3808 pr_err("Unknown Opcode: 0x%02x ITT:"
3809 " 0x%08x, i_state: %d on CID: %hu\n",
3810 cmd->iscsi_opcode, cmd->init_task_tag,
3811 cmd->i_state, conn->cid);
3815 if (atomic_read(&conn->check_immediate_queue))
3826 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3828 struct iscsit_transport *t = conn->conn_transport;
3829 struct iscsi_queue_req *qr;
3830 struct iscsi_cmd *cmd;
3834 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3837 kmem_cache_free(lio_qr_cache, qr);
3839 ret = t->iscsit_response_queue(conn, cmd, state);
3840 if (ret == 1 || ret < 0)
3847 int iscsi_target_tx_thread(void *arg)
3850 struct iscsi_conn *conn;
3851 struct iscsi_thread_set *ts = arg;
3853 * Allow ourselves to be interrupted by SIGINT so that a
3854 * connection recovery / failure event can be triggered externally.
3856 allow_signal(SIGINT);
3859 conn = iscsi_tx_thread_pre_handler(ts);
3865 while (!kthread_should_stop()) {
3867 * Ensure that both TX and RX per connection kthreads
3868 * are scheduled to run on the same CPU.
3870 iscsit_thread_check_cpumask(conn, current, 1);
3872 wait_event_interruptible(conn->queues_wq,
3873 !iscsit_conn_all_queues_empty(conn) ||
3874 ts->status == ISCSI_THREAD_SET_RESET);
3876 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3877 signal_pending(current))
3881 ret = iscsit_handle_immediate_queue(conn);
3885 ret = iscsit_handle_response_queue(conn);
3888 else if (ret == -EAGAIN)
3895 iscsit_take_action_for_connection_exit(conn);
3901 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3903 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3904 struct iscsi_cmd *cmd;
3907 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3908 case ISCSI_OP_SCSI_CMD:
3909 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3913 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3915 case ISCSI_OP_SCSI_DATA_OUT:
3916 ret = iscsit_handle_data_out(conn, buf);
3918 case ISCSI_OP_NOOP_OUT:
3920 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3921 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3925 ret = iscsit_handle_nop_out(conn, cmd, buf);
3927 case ISCSI_OP_SCSI_TMFUNC:
3928 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3932 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3935 ret = iscsit_handle_text_cmd(conn, buf);
3937 case ISCSI_OP_LOGOUT:
3938 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3942 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3944 wait_for_completion_timeout(&conn->conn_logout_comp,
3945 SECONDS_FOR_LOGOUT_COMP * HZ);
3947 case ISCSI_OP_SNACK:
3948 ret = iscsit_handle_snack(conn, buf);
3951 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3952 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3953 pr_err("Cannot recover from unknown"
3954 " opcode while ERL=0, closing iSCSI connection.\n");
3957 if (!conn->conn_ops->OFMarker) {
3958 pr_err("Unable to recover from unknown"
3959 " opcode while OFMarker=No, closing iSCSI"
3963 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3964 pr_err("Unable to recover from unknown"
3965 " opcode, closing iSCSI connection.\n");
3973 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3976 int iscsi_target_rx_thread(void *arg)
3979 u8 buffer[ISCSI_HDR_LEN], opcode;
3980 u32 checksum = 0, digest = 0;
3981 struct iscsi_conn *conn = NULL;
3982 struct iscsi_thread_set *ts = arg;
3985 * Allow ourselves to be interrupted by SIGINT so that a
3986 * connection recovery / failure event can be triggered externally.
3988 allow_signal(SIGINT);
3991 conn = iscsi_rx_thread_pre_handler(ts);
3995 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
3996 struct completion comp;
3999 init_completion(&comp);
4000 rc = wait_for_completion_interruptible(&comp);
4007 while (!kthread_should_stop()) {
4009 * Ensure that both TX and RX per connection kthreads
4010 * are scheduled to run on the same CPU.
4012 iscsit_thread_check_cpumask(conn, current, 0);
4014 memset(buffer, 0, ISCSI_HDR_LEN);
4015 memset(&iov, 0, sizeof(struct kvec));
4017 iov.iov_base = buffer;
4018 iov.iov_len = ISCSI_HDR_LEN;
4020 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4021 if (ret != ISCSI_HDR_LEN) {
4022 iscsit_rx_thread_wait_for_tcp(conn);
4027 * Set conn->bad_hdr for use with REJECT PDUs.
4029 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4031 if (conn->conn_ops->HeaderDigest) {
4032 iov.iov_base = &digest;
4033 iov.iov_len = ISCSI_CRC_LEN;
4035 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4036 if (ret != ISCSI_CRC_LEN) {
4037 iscsit_rx_thread_wait_for_tcp(conn);
4041 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4042 buffer, ISCSI_HDR_LEN,
4043 0, NULL, (u8 *)&checksum);
4045 if (digest != checksum) {
4046 pr_err("HeaderDigest CRC32C failed,"
4047 " received 0x%08x, computed 0x%08x\n",
4050 * Set the PDU to 0xff so it will intentionally
4051 * hit default in the switch below.
4053 memset(buffer, 0xff, ISCSI_HDR_LEN);
4054 spin_lock_bh(&conn->sess->session_stats_lock);
4055 conn->sess->conn_digest_errors++;
4056 spin_unlock_bh(&conn->sess->session_stats_lock);
4058 pr_debug("Got HeaderDigest CRC32C"
4059 " 0x%08x\n", checksum);
4063 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4066 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4068 if (conn->sess->sess_ops->SessionType &&
4069 ((!(opcode & ISCSI_OP_TEXT)) ||
4070 (!(opcode & ISCSI_OP_LOGOUT)))) {
4071 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4072 " while in Discovery Session, rejecting.\n", opcode);
4073 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4078 ret = iscsi_target_rx_opcode(conn, buffer);
4084 if (!signal_pending(current))
4085 atomic_set(&conn->transport_failed, 1);
4086 iscsit_take_action_for_connection_exit(conn);
4092 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4094 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4095 struct iscsi_session *sess = conn->sess;
4097 * We expect this function to only ever be called from either RX or TX
4098 * thread context via iscsit_close_connection() once the other context
4099 * has been reset -> returned sleeping pre-handler state.
4101 spin_lock_bh(&conn->cmd_lock);
4102 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4104 list_del_init(&cmd->i_conn_node);
4105 spin_unlock_bh(&conn->cmd_lock);
4107 iscsit_increment_maxcmdsn(cmd, sess);
4109 iscsit_free_cmd(cmd, true);
4111 spin_lock_bh(&conn->cmd_lock);
4113 spin_unlock_bh(&conn->cmd_lock);
4116 static void iscsit_stop_timers_for_cmds(
4117 struct iscsi_conn *conn)
4119 struct iscsi_cmd *cmd;
4121 spin_lock_bh(&conn->cmd_lock);
4122 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4123 if (cmd->data_direction == DMA_TO_DEVICE)
4124 iscsit_stop_dataout_timer(cmd);
4126 spin_unlock_bh(&conn->cmd_lock);
4129 int iscsit_close_connection(
4130 struct iscsi_conn *conn)
4132 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4133 struct iscsi_session *sess = conn->sess;
4135 pr_debug("Closing iSCSI connection CID %hu on SID:"
4136 " %u\n", conn->cid, sess->sid);
4138 * Always up conn_logout_comp just in case the RX Thread is sleeping
4139 * and the logout response never got sent because the connection
4142 complete(&conn->conn_logout_comp);
4144 iscsi_release_thread_set(conn);
4146 iscsit_stop_timers_for_cmds(conn);
4147 iscsit_stop_nopin_response_timer(conn);
4148 iscsit_stop_nopin_timer(conn);
4150 if (conn->conn_transport->iscsit_wait_conn)
4151 conn->conn_transport->iscsit_wait_conn(conn);
4153 iscsit_free_queue_reqs_for_conn(conn);
4156 * During Connection recovery drop unacknowledged out of order
4157 * commands for this connection, and prepare the other commands
4160 * During normal operation clear the out of order commands (but
4161 * do not free the struct iscsi_ooo_cmdsn's) and release all
4162 * struct iscsi_cmds.
4164 if (atomic_read(&conn->connection_recovery)) {
4165 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4166 iscsit_prepare_cmds_for_realligance(conn);
4168 iscsit_clear_ooo_cmdsns_for_conn(conn);
4169 iscsit_release_commands_from_conn(conn);
4173 * Handle decrementing session or connection usage count if
4174 * a logout response was not able to be sent because the
4175 * connection failed. Fall back to Session Recovery here.
4177 if (atomic_read(&conn->conn_logout_remove)) {
4178 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4179 iscsit_dec_conn_usage_count(conn);
4180 iscsit_dec_session_usage_count(sess);
4182 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4183 iscsit_dec_conn_usage_count(conn);
4185 atomic_set(&conn->conn_logout_remove, 0);
4186 atomic_set(&sess->session_reinstatement, 0);
4187 atomic_set(&sess->session_fall_back_to_erl0, 1);
4190 spin_lock_bh(&sess->conn_lock);
4191 list_del(&conn->conn_list);
4194 * Attempt to let the Initiator know this connection failed by
4195 * sending an Connection Dropped Async Message on another
4196 * active connection.
4198 if (atomic_read(&conn->connection_recovery))
4199 iscsit_build_conn_drop_async_message(conn);
4201 spin_unlock_bh(&sess->conn_lock);
4204 * If connection reinstatement is being performed on this connection,
4205 * up the connection reinstatement semaphore that is being blocked on
4206 * in iscsit_cause_connection_reinstatement().
4208 spin_lock_bh(&conn->state_lock);
4209 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4210 spin_unlock_bh(&conn->state_lock);
4211 complete(&conn->conn_wait_comp);
4212 wait_for_completion(&conn->conn_post_wait_comp);
4213 spin_lock_bh(&conn->state_lock);
4217 * If connection reinstatement is being performed on this connection
4218 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4219 * connection wait rcfr semaphore that is being blocked on
4220 * an iscsit_connection_reinstatement_rcfr().
4222 if (atomic_read(&conn->connection_wait_rcfr)) {
4223 spin_unlock_bh(&conn->state_lock);
4224 complete(&conn->conn_wait_rcfr_comp);
4225 wait_for_completion(&conn->conn_post_wait_comp);
4226 spin_lock_bh(&conn->state_lock);
4228 atomic_set(&conn->connection_reinstatement, 1);
4229 spin_unlock_bh(&conn->state_lock);
4232 * If any other processes are accessing this connection pointer we
4233 * must wait until they have completed.
4235 iscsit_check_conn_usage_count(conn);
4237 if (conn->conn_rx_hash.tfm)
4238 crypto_free_hash(conn->conn_rx_hash.tfm);
4239 if (conn->conn_tx_hash.tfm)
4240 crypto_free_hash(conn->conn_tx_hash.tfm);
4242 if (conn->conn_cpumask)
4243 free_cpumask_var(conn->conn_cpumask);
4245 kfree(conn->conn_ops);
4246 conn->conn_ops = NULL;
4249 sock_release(conn->sock);
4251 if (conn->conn_transport->iscsit_free_conn)
4252 conn->conn_transport->iscsit_free_conn(conn);
4254 iscsit_put_transport(conn->conn_transport);
4256 conn->thread_set = NULL;
4258 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4259 conn->conn_state = TARG_CONN_STATE_FREE;
4262 spin_lock_bh(&sess->conn_lock);
4263 atomic_dec(&sess->nconn);
4264 pr_debug("Decremented iSCSI connection count to %hu from node:"
4265 " %s\n", atomic_read(&sess->nconn),
4266 sess->sess_ops->InitiatorName);
4268 * Make sure that if one connection fails in an non ERL=2 iSCSI
4269 * Session that they all fail.
4271 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4272 !atomic_read(&sess->session_logout))
4273 atomic_set(&sess->session_fall_back_to_erl0, 1);
4276 * If this was not the last connection in the session, and we are
4277 * performing session reinstatement or falling back to ERL=0, call
4278 * iscsit_stop_session() without sleeping to shutdown the other
4279 * active connections.
4281 if (atomic_read(&sess->nconn)) {
4282 if (!atomic_read(&sess->session_reinstatement) &&
4283 !atomic_read(&sess->session_fall_back_to_erl0)) {
4284 spin_unlock_bh(&sess->conn_lock);
4287 if (!atomic_read(&sess->session_stop_active)) {
4288 atomic_set(&sess->session_stop_active, 1);
4289 spin_unlock_bh(&sess->conn_lock);
4290 iscsit_stop_session(sess, 0, 0);
4293 spin_unlock_bh(&sess->conn_lock);
4298 * If this was the last connection in the session and one of the
4299 * following is occurring:
4301 * Session Reinstatement is not being performed, and are falling back
4302 * to ERL=0 call iscsit_close_session().
4304 * Session Logout was requested. iscsit_close_session() will be called
4307 * Session Continuation is not being performed, start the Time2Retain
4308 * handler and check if sleep_on_sess_wait_sem is active.
4310 if (!atomic_read(&sess->session_reinstatement) &&
4311 atomic_read(&sess->session_fall_back_to_erl0)) {
4312 spin_unlock_bh(&sess->conn_lock);
4313 target_put_session(sess->se_sess);
4316 } else if (atomic_read(&sess->session_logout)) {
4317 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4318 sess->session_state = TARG_SESS_STATE_FREE;
4319 spin_unlock_bh(&sess->conn_lock);
4321 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4322 complete(&sess->session_wait_comp);
4326 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4327 sess->session_state = TARG_SESS_STATE_FAILED;
4329 if (!atomic_read(&sess->session_continuation)) {
4330 spin_unlock_bh(&sess->conn_lock);
4331 iscsit_start_time2retain_handler(sess);
4333 spin_unlock_bh(&sess->conn_lock);
4335 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4336 complete(&sess->session_wait_comp);
4340 spin_unlock_bh(&sess->conn_lock);
4345 int iscsit_close_session(struct iscsi_session *sess)
4347 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4348 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4350 if (atomic_read(&sess->nconn)) {
4351 pr_err("%d connection(s) still exist for iSCSI session"
4352 " to %s\n", atomic_read(&sess->nconn),
4353 sess->sess_ops->InitiatorName);
4357 spin_lock_bh(&se_tpg->session_lock);
4358 atomic_set(&sess->session_logout, 1);
4359 atomic_set(&sess->session_reinstatement, 1);
4360 iscsit_stop_time2retain_timer(sess);
4361 spin_unlock_bh(&se_tpg->session_lock);
4364 * transport_deregister_session_configfs() will clear the
4365 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4366 * can be setting it again with __transport_register_session() in
4367 * iscsi_post_login_handler() again after the iscsit_stop_session()
4368 * completes in iscsi_np context.
4370 transport_deregister_session_configfs(sess->se_sess);
4373 * If any other processes are accessing this session pointer we must
4374 * wait until they have completed. If we are in an interrupt (the
4375 * time2retain handler) and contain and active session usage count we
4376 * restart the timer and exit.
4378 if (!in_interrupt()) {
4379 if (iscsit_check_session_usage_count(sess) == 1)
4380 iscsit_stop_session(sess, 1, 1);
4382 if (iscsit_check_session_usage_count(sess) == 2) {
4383 atomic_set(&sess->session_logout, 0);
4384 iscsit_start_time2retain_handler(sess);
4389 transport_deregister_session(sess->se_sess);
4391 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4392 iscsit_free_connection_recovery_entires(sess);
4394 iscsit_free_all_ooo_cmdsns(sess);
4396 spin_lock_bh(&se_tpg->session_lock);
4397 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4398 sess->session_state = TARG_SESS_STATE_FREE;
4399 pr_debug("Released iSCSI session from node: %s\n",
4400 sess->sess_ops->InitiatorName);
4403 tpg->tpg_tiqn->tiqn_nsessions--;
4405 pr_debug("Decremented number of active iSCSI Sessions on"
4406 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4408 spin_lock(&sess_idr_lock);
4409 idr_remove(&sess_idr, sess->session_index);
4410 spin_unlock(&sess_idr_lock);
4412 kfree(sess->sess_ops);
4413 sess->sess_ops = NULL;
4414 spin_unlock_bh(&se_tpg->session_lock);
4420 static void iscsit_logout_post_handler_closesession(
4421 struct iscsi_conn *conn)
4423 struct iscsi_session *sess = conn->sess;
4425 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4426 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4428 atomic_set(&conn->conn_logout_remove, 0);
4429 complete(&conn->conn_logout_comp);
4431 iscsit_dec_conn_usage_count(conn);
4432 iscsit_stop_session(sess, 1, 1);
4433 iscsit_dec_session_usage_count(sess);
4434 target_put_session(sess->se_sess);
4437 static void iscsit_logout_post_handler_samecid(
4438 struct iscsi_conn *conn)
4440 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4441 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4443 atomic_set(&conn->conn_logout_remove, 0);
4444 complete(&conn->conn_logout_comp);
4446 iscsit_cause_connection_reinstatement(conn, 1);
4447 iscsit_dec_conn_usage_count(conn);
4450 static void iscsit_logout_post_handler_diffcid(
4451 struct iscsi_conn *conn,
4454 struct iscsi_conn *l_conn;
4455 struct iscsi_session *sess = conn->sess;
4460 spin_lock_bh(&sess->conn_lock);
4461 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4462 if (l_conn->cid == cid) {
4463 iscsit_inc_conn_usage_count(l_conn);
4467 spin_unlock_bh(&sess->conn_lock);
4473 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4475 spin_lock_bh(&l_conn->state_lock);
4476 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4477 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4478 spin_unlock_bh(&l_conn->state_lock);
4480 iscsit_cause_connection_reinstatement(l_conn, 1);
4481 iscsit_dec_conn_usage_count(l_conn);
4485 * Return of 0 causes the TX thread to restart.
4487 int iscsit_logout_post_handler(
4488 struct iscsi_cmd *cmd,
4489 struct iscsi_conn *conn)
4493 switch (cmd->logout_reason) {
4494 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4495 switch (cmd->logout_response) {
4496 case ISCSI_LOGOUT_SUCCESS:
4497 case ISCSI_LOGOUT_CLEANUP_FAILED:
4499 iscsit_logout_post_handler_closesession(conn);
4504 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4505 if (conn->cid == cmd->logout_cid) {
4506 switch (cmd->logout_response) {
4507 case ISCSI_LOGOUT_SUCCESS:
4508 case ISCSI_LOGOUT_CLEANUP_FAILED:
4510 iscsit_logout_post_handler_samecid(conn);
4515 switch (cmd->logout_response) {
4516 case ISCSI_LOGOUT_SUCCESS:
4517 iscsit_logout_post_handler_diffcid(conn,
4520 case ISCSI_LOGOUT_CID_NOT_FOUND:
4521 case ISCSI_LOGOUT_CLEANUP_FAILED:
4528 case ISCSI_LOGOUT_REASON_RECOVERY:
4529 switch (cmd->logout_response) {
4530 case ISCSI_LOGOUT_SUCCESS:
4531 case ISCSI_LOGOUT_CID_NOT_FOUND:
4532 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4533 case ISCSI_LOGOUT_CLEANUP_FAILED:
4545 EXPORT_SYMBOL(iscsit_logout_post_handler);
4547 void iscsit_fail_session(struct iscsi_session *sess)
4549 struct iscsi_conn *conn;
4551 spin_lock_bh(&sess->conn_lock);
4552 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4553 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4554 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4556 spin_unlock_bh(&sess->conn_lock);
4558 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4559 sess->session_state = TARG_SESS_STATE_FAILED;
4562 int iscsit_free_session(struct iscsi_session *sess)
4564 u16 conn_count = atomic_read(&sess->nconn);
4565 struct iscsi_conn *conn, *conn_tmp = NULL;
4568 spin_lock_bh(&sess->conn_lock);
4569 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4571 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4573 if (conn_count == 0)
4576 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4579 iscsit_inc_conn_usage_count(conn_tmp);
4582 iscsit_inc_conn_usage_count(conn);
4584 spin_unlock_bh(&sess->conn_lock);
4585 iscsit_cause_connection_reinstatement(conn, 1);
4586 spin_lock_bh(&sess->conn_lock);
4588 iscsit_dec_conn_usage_count(conn);
4590 iscsit_dec_conn_usage_count(conn_tmp);
4595 if (atomic_read(&sess->nconn)) {
4596 spin_unlock_bh(&sess->conn_lock);
4597 wait_for_completion(&sess->session_wait_comp);
4599 spin_unlock_bh(&sess->conn_lock);
4601 target_put_session(sess->se_sess);
4605 void iscsit_stop_session(
4606 struct iscsi_session *sess,
4608 int connection_sleep)
4610 u16 conn_count = atomic_read(&sess->nconn);
4611 struct iscsi_conn *conn, *conn_tmp = NULL;
4614 spin_lock_bh(&sess->conn_lock);
4616 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4618 if (connection_sleep) {
4619 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4621 if (conn_count == 0)
4624 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4627 iscsit_inc_conn_usage_count(conn_tmp);
4630 iscsit_inc_conn_usage_count(conn);
4632 spin_unlock_bh(&sess->conn_lock);
4633 iscsit_cause_connection_reinstatement(conn, 1);
4634 spin_lock_bh(&sess->conn_lock);
4636 iscsit_dec_conn_usage_count(conn);
4638 iscsit_dec_conn_usage_count(conn_tmp);
4642 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4643 iscsit_cause_connection_reinstatement(conn, 0);
4646 if (session_sleep && atomic_read(&sess->nconn)) {
4647 spin_unlock_bh(&sess->conn_lock);
4648 wait_for_completion(&sess->session_wait_comp);
4650 spin_unlock_bh(&sess->conn_lock);
4653 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4655 struct iscsi_session *sess;
4656 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4657 struct se_session *se_sess, *se_sess_tmp;
4658 int session_count = 0;
4660 spin_lock_bh(&se_tpg->session_lock);
4661 if (tpg->nsessions && !force) {
4662 spin_unlock_bh(&se_tpg->session_lock);
4666 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4668 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4670 spin_lock(&sess->conn_lock);
4671 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4672 atomic_read(&sess->session_logout) ||
4673 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4674 spin_unlock(&sess->conn_lock);
4677 atomic_set(&sess->session_reinstatement, 1);
4678 spin_unlock(&sess->conn_lock);
4679 spin_unlock_bh(&se_tpg->session_lock);
4681 iscsit_free_session(sess);
4682 spin_lock_bh(&se_tpg->session_lock);
4686 spin_unlock_bh(&se_tpg->session_lock);
4688 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4689 " Group: %hu\n", session_count, tpg->tpgt);
4693 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4694 MODULE_VERSION("4.1.x");
4695 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4696 MODULE_LICENSE("GPL");
4698 module_init(iscsi_target_init_module);
4699 module_exit(iscsi_target_cleanup_module);