1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
50 #include <target/iscsi/iscsi_transport.h>
52 static LIST_HEAD(g_tiqn_list);
53 static LIST_HEAD(g_np_list);
54 static DEFINE_SPINLOCK(tiqn_lock);
55 static DEFINE_MUTEX(np_lock);
57 static struct idr tiqn_idr;
59 struct mutex auth_id_lock;
60 spinlock_t sess_idr_lock;
62 struct iscsit_global *iscsit_global;
64 struct kmem_cache *lio_qr_cache;
65 struct kmem_cache *lio_dr_cache;
66 struct kmem_cache *lio_ooo_cache;
67 struct kmem_cache *lio_r2t_cache;
69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
70 struct iscsi_scsi_req *, u32);
72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 struct iscsi_tiqn *tiqn = NULL;
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
87 spin_unlock(&tiqn->tiqn_state_lock);
90 spin_unlock(&tiqn_lock);
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
103 spin_unlock(&tiqn->tiqn_state_lock);
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 struct iscsi_tiqn *tiqn = NULL;
124 if (strlen(buf) >= ISCSI_IQN_LEN) {
125 pr_err("Target IQN exceeds %d bytes\n",
127 return ERR_PTR(-EINVAL);
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
145 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
147 idr_preload(GFP_KERNEL);
148 spin_lock(&tiqn_lock);
150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
153 spin_unlock(&tiqn_lock);
158 tiqn->tiqn_index = ret;
159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
161 spin_unlock(&tiqn_lock);
164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
173 * Wait for accesses to said struct iscsi_tiqn to end.
175 spin_lock(&tiqn->tiqn_state_lock);
176 while (tiqn->tiqn_access_count != 0) {
177 spin_unlock(&tiqn->tiqn_state_lock);
179 spin_lock(&tiqn->tiqn_state_lock);
181 spin_unlock(&tiqn->tiqn_state_lock);
184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
188 * while holding tiqn->tiqn_state_lock. This means that all subsequent
189 * attempts to access this struct iscsi_tiqn will fail from both transport
190 * fabric and control code paths.
192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
193 pr_err("iscsit_set_tiqn_shutdown() failed\n");
197 iscsit_wait_for_tiqn(tiqn);
199 spin_lock(&tiqn_lock);
200 list_del(&tiqn->tiqn_list);
201 idr_remove(&tiqn_idr, tiqn->tiqn_index);
202 spin_unlock(&tiqn_lock);
204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
213 * Determine if the network portal is accepting storage traffic.
215 spin_lock_bh(&np->np_thread_lock);
216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
217 spin_unlock_bh(&np->np_thread_lock);
220 spin_unlock_bh(&np->np_thread_lock);
222 * Determine if the portal group is accepting storage traffic.
224 spin_lock_bh(&tpg->tpg_state_lock);
225 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
226 spin_unlock_bh(&tpg->tpg_state_lock);
229 spin_unlock_bh(&tpg->tpg_state_lock);
232 * Here we serialize access across the TIQN+TPG Tuple.
234 ret = down_interruptible(&tpg->np_login_sem);
235 if ((ret != 0) || signal_pending(current))
238 spin_lock_bh(&tpg->tpg_state_lock);
239 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
240 spin_unlock_bh(&tpg->tpg_state_lock);
241 up(&tpg->np_login_sem);
244 spin_unlock_bh(&tpg->tpg_state_lock);
249 void iscsit_login_kref_put(struct kref *kref)
251 struct iscsi_tpg_np *tpg_np = container_of(kref,
252 struct iscsi_tpg_np, tpg_np_kref);
254 complete(&tpg_np->tpg_np_comp);
257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
258 struct iscsi_tpg_np *tpg_np)
260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
262 up(&tpg->np_login_sem);
265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
268 iscsit_put_tiqn_for_login(tiqn);
273 bool iscsit_check_np_match(
274 struct __kernel_sockaddr_storage *sockaddr,
276 int network_transport)
278 struct sockaddr_in *sock_in, *sock_in_e;
279 struct sockaddr_in6 *sock_in6, *sock_in6_e;
280 bool ip_match = false;
283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
287 if (!memcmp(&sock_in6->sin6_addr.in6_u,
288 &sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
292 port = ntohs(sock_in6->sin6_port);
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
300 port = ntohs(sock_in->sin_port);
303 if ((ip_match == true) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport))
311 * Called with mutex np_lock held
313 static struct iscsi_np *iscsit_get_np(
314 struct __kernel_sockaddr_storage *sockaddr,
315 int network_transport)
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
335 spin_unlock_bh(&np->np_thread_lock);
338 spin_unlock_bh(&np->np_thread_lock);
344 struct iscsi_np *iscsit_add_np(
345 struct __kernel_sockaddr_storage *sockaddr,
347 int network_transport)
349 struct sockaddr_in *sock_in;
350 struct sockaddr_in6 *sock_in6;
354 mutex_lock(&np_lock);
357 * Locate the existing struct iscsi_np if already active..
359 np = iscsit_get_np(sockaddr, network_transport);
361 mutex_unlock(&np_lock);
365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
367 pr_err("Unable to allocate memory for struct iscsi_np\n");
368 mutex_unlock(&np_lock);
369 return ERR_PTR(-ENOMEM);
372 np->np_flags |= NPF_IP_NETWORK;
373 if (sockaddr->ss_family == AF_INET6) {
374 sock_in6 = (struct sockaddr_in6 *)sockaddr;
375 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
376 np->np_port = ntohs(sock_in6->sin6_port);
378 sock_in = (struct sockaddr_in *)sockaddr;
379 sprintf(np->np_ip, "%s", ip_str);
380 np->np_port = ntohs(sock_in->sin_port);
383 np->np_network_transport = network_transport;
384 spin_lock_init(&np->np_thread_lock);
385 init_completion(&np->np_restart_comp);
386 INIT_LIST_HEAD(&np->np_list);
388 ret = iscsi_target_setup_login_socket(np, sockaddr);
391 mutex_unlock(&np_lock);
395 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
396 if (IS_ERR(np->np_thread)) {
397 pr_err("Unable to create kthread: iscsi_np\n");
398 ret = PTR_ERR(np->np_thread);
400 mutex_unlock(&np_lock);
404 * Increment the np_exports reference count now to prevent
405 * iscsit_del_np() below from being run while a new call to
406 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
407 * active. We don't need to hold np->np_thread_lock at this
408 * point because iscsi_np has not been added to g_np_list yet.
411 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
413 list_add_tail(&np->np_list, &g_np_list);
414 mutex_unlock(&np_lock);
416 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
417 np->np_ip, np->np_port, np->np_transport->name);
422 int iscsit_reset_np_thread(
424 struct iscsi_tpg_np *tpg_np,
425 struct iscsi_portal_group *tpg,
428 spin_lock_bh(&np->np_thread_lock);
429 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
430 spin_unlock_bh(&np->np_thread_lock);
433 np->np_thread_state = ISCSI_NP_THREAD_RESET;
436 spin_unlock_bh(&np->np_thread_lock);
437 send_sig(SIGINT, np->np_thread, 1);
438 wait_for_completion(&np->np_restart_comp);
439 spin_lock_bh(&np->np_thread_lock);
441 spin_unlock_bh(&np->np_thread_lock);
443 if (tpg_np && shutdown) {
444 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
446 wait_for_completion(&tpg_np->tpg_np_comp);
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);
476 np->np_thread = NULL;
479 np->np_transport->iscsit_free_np(np);
481 mutex_lock(&np_lock);
482 list_del(&np->np_list);
483 mutex_unlock(&np_lock);
485 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
486 np->np_ip, np->np_port, np->np_transport->name);
488 iscsit_put_transport(np->np_transport);
493 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
496 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
498 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
502 static struct iscsit_transport iscsi_target_transport = {
504 .transport_type = ISCSI_TCP,
506 .iscsit_setup_np = iscsit_setup_np,
507 .iscsit_accept_np = iscsit_accept_np,
508 .iscsit_free_np = iscsit_free_np,
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_qr_cache = kmem_cache_create("lio_qr_cache",
550 sizeof(struct iscsi_queue_req),
551 __alignof__(struct iscsi_queue_req), 0, NULL);
553 pr_err("nable to kmem_cache_create() for"
558 lio_dr_cache = kmem_cache_create("lio_dr_cache",
559 sizeof(struct iscsi_datain_req),
560 __alignof__(struct iscsi_datain_req), 0, NULL);
562 pr_err("Unable to kmem_cache_create() for"
567 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
568 sizeof(struct iscsi_ooo_cmdsn),
569 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
570 if (!lio_ooo_cache) {
571 pr_err("Unable to kmem_cache_create() for"
576 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
577 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
579 if (!lio_r2t_cache) {
580 pr_err("Unable to kmem_cache_create() for"
585 iscsit_register_transport(&iscsi_target_transport);
587 if (iscsit_load_discovery_tpg() < 0)
592 kmem_cache_destroy(lio_r2t_cache);
594 kmem_cache_destroy(lio_ooo_cache);
596 kmem_cache_destroy(lio_dr_cache);
598 kmem_cache_destroy(lio_qr_cache);
600 iscsi_deallocate_thread_sets();
602 iscsi_thread_set_free();
604 iscsi_target_deregister_configfs();
606 kfree(iscsit_global);
610 static void __exit iscsi_target_cleanup_module(void)
612 iscsi_deallocate_thread_sets();
613 iscsi_thread_set_free();
614 iscsit_release_discovery_tpg();
615 iscsit_unregister_transport(&iscsi_target_transport);
616 kmem_cache_destroy(lio_qr_cache);
617 kmem_cache_destroy(lio_dr_cache);
618 kmem_cache_destroy(lio_ooo_cache);
619 kmem_cache_destroy(lio_r2t_cache);
621 iscsi_target_deregister_configfs();
623 kfree(iscsit_global);
626 static int iscsit_add_reject(
627 struct iscsi_conn *conn,
631 struct iscsi_cmd *cmd;
633 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
637 cmd->iscsi_opcode = ISCSI_OP_REJECT;
638 cmd->reject_reason = reason;
640 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
642 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
643 iscsit_free_cmd(cmd, false);
647 spin_lock_bh(&conn->cmd_lock);
648 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
649 spin_unlock_bh(&conn->cmd_lock);
651 cmd->i_state = ISTATE_SEND_REJECT;
652 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
657 static int iscsit_add_reject_from_cmd(
658 struct iscsi_cmd *cmd,
663 struct iscsi_conn *conn;
666 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
672 cmd->iscsi_opcode = ISCSI_OP_REJECT;
673 cmd->reject_reason = reason;
675 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
677 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
678 iscsit_free_cmd(cmd, false);
683 spin_lock_bh(&conn->cmd_lock);
684 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
685 spin_unlock_bh(&conn->cmd_lock);
688 cmd->i_state = ISTATE_SEND_REJECT;
689 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
691 * Perform the kref_put now if se_cmd has already been setup by
692 * scsit_setup_scsi_cmd()
694 if (cmd->se_cmd.se_tfo != NULL) {
695 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
696 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
701 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
704 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
707 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
709 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
713 * Map some portion of the allocated scatterlist to an iovec, suitable for
714 * kernel sockets to copy data in/out.
716 static int iscsit_map_iovec(
717 struct iscsi_cmd *cmd,
723 struct scatterlist *sg;
724 unsigned int page_off;
727 * We know each entry in t_data_sg contains a page.
729 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
730 page_off = (data_offset % PAGE_SIZE);
732 cmd->first_data_sg = sg;
733 cmd->first_data_sg_off = page_off;
735 while (data_length) {
736 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
738 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
739 iov[i].iov_len = cur_len;
741 data_length -= cur_len;
747 cmd->kmapped_nents = i;
752 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
755 struct scatterlist *sg;
757 sg = cmd->first_data_sg;
759 for (i = 0; i < cmd->kmapped_nents; i++)
760 kunmap(sg_page(&sg[i]));
763 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
766 struct iscsi_cmd *cmd, *cmd_p;
768 conn->exp_statsn = exp_statsn;
770 if (conn->sess->sess_ops->RDMAExtensions)
773 spin_lock_bh(&conn->cmd_lock);
774 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
775 spin_lock(&cmd->istate_lock);
776 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
777 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
778 cmd->i_state = ISTATE_REMOVE;
779 spin_unlock(&cmd->istate_lock);
780 list_move_tail(&cmd->i_conn_node, &ack_list);
783 spin_unlock(&cmd->istate_lock);
785 spin_unlock_bh(&conn->cmd_lock);
787 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
788 list_del_init(&cmd->i_conn_node);
789 iscsit_free_cmd(cmd, false);
793 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
795 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
797 iov_count += ISCSI_IOV_DATA_BUFFER;
799 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
800 if (!cmd->iov_data) {
801 pr_err("Unable to allocate cmd->iov_data\n");
805 cmd->orig_iov_data_count = iov_count;
809 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
812 int data_direction, payload_length;
813 struct iscsi_scsi_req *hdr;
817 atomic_long_inc(&conn->sess->cmd_pdus);
819 hdr = (struct iscsi_scsi_req *) buf;
820 payload_length = ntoh24(hdr->dlength);
822 /* FIXME; Add checks for AdditionalHeaderSegment */
824 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
825 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
826 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
827 " not set. Bad iSCSI Initiator.\n");
828 return iscsit_add_reject_cmd(cmd,
829 ISCSI_REASON_BOOKMARK_INVALID, buf);
832 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
833 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
835 * From RFC-3720 Section 10.3.1:
837 * "Either or both of R and W MAY be 1 when either the
838 * Expected Data Transfer Length and/or Bidirectional Read
839 * Expected Data Transfer Length are 0"
841 * For this case, go ahead and clear the unnecssary bits
842 * to avoid any confusion with ->data_direction.
844 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
845 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
847 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
848 " set when Expected Data Transfer Length is 0 for"
849 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
852 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
853 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
854 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
855 " MUST be set if Expected Data Transfer Length is not 0."
856 " Bad iSCSI Initiator\n");
857 return iscsit_add_reject_cmd(cmd,
858 ISCSI_REASON_BOOKMARK_INVALID, buf);
861 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
862 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
863 pr_err("Bidirectional operations not supported!\n");
864 return iscsit_add_reject_cmd(cmd,
865 ISCSI_REASON_BOOKMARK_INVALID, buf);
868 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
869 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
870 " Scsi Command PDU.\n");
871 return iscsit_add_reject_cmd(cmd,
872 ISCSI_REASON_BOOKMARK_INVALID, buf);
875 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
876 pr_err("ImmediateData=No but DataSegmentLength=%u,"
877 " protocol error.\n", payload_length);
878 return iscsit_add_reject_cmd(cmd,
879 ISCSI_REASON_PROTOCOL_ERROR, buf);
882 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
883 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
884 pr_err("Expected Data Transfer Length and Length of"
885 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
886 " bit is not set protocol error\n");
887 return iscsit_add_reject_cmd(cmd,
888 ISCSI_REASON_PROTOCOL_ERROR, buf);
891 if (payload_length > be32_to_cpu(hdr->data_length)) {
892 pr_err("DataSegmentLength: %u is greater than"
893 " EDTL: %u, protocol error.\n", payload_length,
895 return iscsit_add_reject_cmd(cmd,
896 ISCSI_REASON_PROTOCOL_ERROR, buf);
899 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
900 pr_err("DataSegmentLength: %u is greater than"
901 " MaxXmitDataSegmentLength: %u, protocol error.\n",
902 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
903 return iscsit_add_reject_cmd(cmd,
904 ISCSI_REASON_PROTOCOL_ERROR, buf);
907 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
908 pr_err("DataSegmentLength: %u is greater than"
909 " FirstBurstLength: %u, protocol error.\n",
910 payload_length, conn->sess->sess_ops->FirstBurstLength);
911 return iscsit_add_reject_cmd(cmd,
912 ISCSI_REASON_BOOKMARK_INVALID, buf);
915 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
916 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
919 cmd->data_direction = data_direction;
920 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
922 * Figure out the SAM Task Attribute for the incoming SCSI CDB
924 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
925 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
926 sam_task_attr = MSG_SIMPLE_TAG;
927 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
928 sam_task_attr = MSG_ORDERED_TAG;
929 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
930 sam_task_attr = MSG_HEAD_TAG;
931 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
932 sam_task_attr = MSG_ACA_TAG;
934 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
935 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
936 sam_task_attr = MSG_SIMPLE_TAG;
939 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
940 cmd->i_state = ISTATE_NEW_CMD;
941 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
942 cmd->immediate_data = (payload_length) ? 1 : 0;
943 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
944 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
945 if (cmd->unsolicited_data)
946 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
948 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
949 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
950 spin_lock_bh(&conn->sess->ttt_lock);
951 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
952 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
953 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
954 spin_unlock_bh(&conn->sess->ttt_lock);
955 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
956 cmd->targ_xfer_tag = 0xFFFFFFFF;
957 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
958 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
959 cmd->first_burst_len = payload_length;
961 if (!conn->sess->sess_ops->RDMAExtensions &&
962 cmd->data_direction == DMA_FROM_DEVICE) {
963 struct iscsi_datain_req *dr;
965 dr = iscsit_allocate_datain_req();
967 return iscsit_add_reject_cmd(cmd,
968 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
970 iscsit_attach_datain_req(cmd, dr);
974 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
976 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
977 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
978 cmd->data_direction, sam_task_attr,
979 cmd->sense_buffer + 2);
981 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
982 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
983 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
986 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
988 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
989 scsilun_to_int(&hdr->lun));
990 if (cmd->sense_reason)
993 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
994 if (cmd->sense_reason) {
995 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
996 return iscsit_add_reject_cmd(cmd,
997 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1003 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1004 return iscsit_add_reject_cmd(cmd,
1005 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1009 spin_lock_bh(&conn->cmd_lock);
1010 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1011 spin_unlock_bh(&conn->cmd_lock);
1013 * Check if we need to delay processing because of ALUA
1014 * Active/NonOptimized primary access state..
1016 core_alua_check_nonop_delay(&cmd->se_cmd);
1020 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1022 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1024 iscsit_set_dataout_sequence_values(cmd);
1026 spin_lock_bh(&cmd->dataout_timeout_lock);
1027 iscsit_start_dataout_timer(cmd, cmd->conn);
1028 spin_unlock_bh(&cmd->dataout_timeout_lock);
1030 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1032 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1033 struct iscsi_scsi_req *hdr)
1037 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1038 * the Immediate Bit is not set, and no Immediate
1041 * A PDU/CmdSN carrying Immediate Data can only
1042 * be processed after the DataCRC has passed.
1043 * If the DataCRC fails, the CmdSN MUST NOT
1044 * be acknowledged. (See below)
1046 if (!cmd->immediate_data) {
1047 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1048 (unsigned char *)hdr, hdr->cmdsn);
1049 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1051 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1052 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1057 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1060 * If no Immediate Data is attached, it's OK to return now.
1062 if (!cmd->immediate_data) {
1063 if (!cmd->sense_reason && cmd->unsolicited_data)
1064 iscsit_set_unsoliticed_dataout(cmd);
1065 if (!cmd->sense_reason)
1068 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1073 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1074 * execution. These exceptions are processed in CmdSN order using
1075 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1077 if (cmd->sense_reason) {
1078 if (cmd->reject_reason)
1084 * Call directly into transport_generic_new_cmd() to perform
1085 * the backend memory allocation.
1087 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1088 if (cmd->sense_reason)
1093 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1096 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1099 struct iscsi_conn *conn = cmd->conn;
1100 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1102 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1104 if (dump_payload == true)
1105 goto after_immediate_data;
1107 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1108 cmd->first_burst_len);
1109 after_immediate_data:
1110 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1112 * A PDU/CmdSN carrying Immediate Data passed
1113 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1114 * Immediate Bit is not set.
1116 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1117 (unsigned char *)hdr, hdr->cmdsn);
1118 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1121 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1124 rc = iscsit_dump_data_payload(cmd->conn,
1125 cmd->first_burst_len, 1);
1126 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1128 } else if (cmd->unsolicited_data)
1129 iscsit_set_unsoliticed_dataout(cmd);
1131 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1133 * Immediate Data failed DataCRC and ERL>=1,
1134 * silently drop this PDU and let the initiator
1135 * plug the CmdSN gap.
1137 * FIXME: Send Unsolicited NOPIN with reserved
1138 * TTT here to help the initiator figure out
1139 * the missing CmdSN, although they should be
1140 * intelligent enough to determine the missing
1141 * CmdSN and issue a retry to plug the sequence.
1143 cmd->i_state = ISTATE_REMOVE;
1144 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1145 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1152 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1155 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1157 bool dump_payload = false;
1159 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1163 * Allocation iovecs needed for struct socket operations for
1164 * traditional iSCSI block I/O.
1166 if (iscsit_allocate_iovecs(cmd) < 0) {
1167 return iscsit_add_reject_cmd(cmd,
1168 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1170 immed_data = cmd->immediate_data;
1172 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1176 dump_payload = true;
1181 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1184 static u32 iscsit_do_crypto_hash_sg(
1185 struct hash_desc *hash,
1186 struct iscsi_cmd *cmd,
1194 struct scatterlist *sg;
1195 unsigned int page_off;
1197 crypto_hash_init(hash);
1199 sg = cmd->first_data_sg;
1200 page_off = cmd->first_data_sg_off;
1203 while (data_length) {
1204 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1206 crypto_hash_update(hash, &sg[i], cur_len);
1208 data_length -= cur_len;
1214 struct scatterlist pad_sg;
1216 sg_init_one(&pad_sg, pad_bytes, padding);
1217 crypto_hash_update(hash, &pad_sg, padding);
1219 crypto_hash_final(hash, (u8 *) &data_crc);
1224 static void iscsit_do_crypto_hash_buf(
1225 struct hash_desc *hash,
1232 struct scatterlist sg;
1234 crypto_hash_init(hash);
1236 sg_init_one(&sg, buf, payload_length);
1237 crypto_hash_update(hash, &sg, payload_length);
1240 sg_init_one(&sg, pad_bytes, padding);
1241 crypto_hash_update(hash, &sg, padding);
1243 crypto_hash_final(hash, data_crc);
1247 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1248 struct iscsi_cmd **out_cmd)
1250 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1251 struct iscsi_cmd *cmd = NULL;
1252 struct se_cmd *se_cmd;
1253 u32 payload_length = ntoh24(hdr->dlength);
1256 if (!payload_length) {
1257 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1262 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1264 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1265 pr_err("DataSegmentLength: %u is greater than"
1266 " MaxXmitDataSegmentLength: %u\n", payload_length,
1267 conn->conn_ops->MaxXmitDataSegmentLength);
1268 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1272 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1277 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1278 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1279 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1280 payload_length, conn->cid);
1282 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1283 pr_err("Command ITT: 0x%08x received DataOUT after"
1284 " last DataOUT received, dumping payload\n",
1285 cmd->init_task_tag);
1286 return iscsit_dump_data_payload(conn, payload_length, 1);
1289 if (cmd->data_direction != DMA_TO_DEVICE) {
1290 pr_err("Command ITT: 0x%08x received DataOUT for a"
1291 " NON-WRITE command.\n", cmd->init_task_tag);
1292 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1294 se_cmd = &cmd->se_cmd;
1295 iscsit_mod_dataout_timer(cmd);
1297 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1298 pr_err("DataOut Offset: %u, Length %u greater than"
1299 " iSCSI Command EDTL %u, protocol error.\n",
1300 hdr->offset, payload_length, cmd->se_cmd.data_length);
1301 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1304 if (cmd->unsolicited_data) {
1305 int dump_unsolicited_data = 0;
1307 if (conn->sess->sess_ops->InitialR2T) {
1308 pr_err("Received unexpected unsolicited data"
1309 " while InitialR2T=Yes, protocol error.\n");
1310 transport_send_check_condition_and_sense(&cmd->se_cmd,
1311 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1315 * Special case for dealing with Unsolicited DataOUT
1316 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1320 /* Something's amiss if we're not in WRITE_PENDING state... */
1321 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1322 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1323 dump_unsolicited_data = 1;
1325 if (dump_unsolicited_data) {
1327 * Check if a delayed TASK_ABORTED status needs to
1328 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1329 * received with the unsolicitied data out.
1331 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1332 iscsit_stop_dataout_timer(cmd);
1334 transport_check_aborted_status(se_cmd,
1335 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1336 return iscsit_dump_data_payload(conn, payload_length, 1);
1340 * For the normal solicited data path:
1342 * Check for a delayed TASK_ABORTED status and dump any
1343 * incoming data out payload if one exists. Also, when the
1344 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1345 * data out sequence, we decrement outstanding_r2ts. Once
1346 * outstanding_r2ts reaches zero, go ahead and send the delayed
1347 * TASK_ABORTED status.
1349 if (se_cmd->transport_state & CMD_T_ABORTED) {
1350 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1351 if (--cmd->outstanding_r2ts < 1) {
1352 iscsit_stop_dataout_timer(cmd);
1353 transport_check_aborted_status(
1357 return iscsit_dump_data_payload(conn, payload_length, 1);
1361 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1362 * within-command recovery checks before receiving the payload.
1364 rc = iscsit_check_pre_dataout(cmd, buf);
1365 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1367 else if (rc == DATAOUT_CANNOT_RECOVER)
1373 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1376 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1377 struct iscsi_data *hdr)
1380 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1381 u32 payload_length = ntoh24(hdr->dlength);
1382 int iov_ret, data_crc_failed = 0;
1384 rx_size += payload_length;
1385 iov = &cmd->iov_data[0];
1387 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1392 iov_count += iov_ret;
1394 padding = ((-payload_length) & 3);
1396 iov[iov_count].iov_base = cmd->pad_bytes;
1397 iov[iov_count++].iov_len = padding;
1399 pr_debug("Receiving %u padding bytes.\n", padding);
1402 if (conn->conn_ops->DataDigest) {
1403 iov[iov_count].iov_base = &checksum;
1404 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1405 rx_size += ISCSI_CRC_LEN;
1408 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1410 iscsit_unmap_iovec(cmd);
1412 if (rx_got != rx_size)
1415 if (conn->conn_ops->DataDigest) {
1418 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1419 be32_to_cpu(hdr->offset),
1420 payload_length, padding,
1423 if (checksum != data_crc) {
1424 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1425 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1426 " does not match computed 0x%08x\n",
1427 hdr->itt, hdr->offset, payload_length,
1428 hdr->datasn, checksum, data_crc);
1429 data_crc_failed = 1;
1431 pr_debug("Got CRC32C DataDigest 0x%08x for"
1432 " %u bytes of Data Out\n", checksum,
1437 return data_crc_failed;
1441 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1442 bool data_crc_failed)
1444 struct iscsi_conn *conn = cmd->conn;
1447 * Increment post receive data and CRC values or perform
1448 * within-command recovery.
1450 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1451 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1453 else if (rc == DATAOUT_SEND_R2T) {
1454 iscsit_set_dataout_sequence_values(cmd);
1455 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1456 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1458 * Handle extra special case for out of order
1459 * Unsolicited Data Out.
1461 spin_lock_bh(&cmd->istate_lock);
1462 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1463 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1464 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1465 spin_unlock_bh(&cmd->istate_lock);
1467 iscsit_stop_dataout_timer(cmd);
1470 target_execute_cmd(&cmd->se_cmd);
1472 } else /* DATAOUT_CANNOT_RECOVER */
1477 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1479 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1481 struct iscsi_cmd *cmd = NULL;
1482 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1484 bool data_crc_failed = false;
1486 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1492 rc = iscsit_get_dataout(conn, cmd, hdr);
1496 data_crc_failed = true;
1498 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1501 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1502 struct iscsi_nopout *hdr)
1504 u32 payload_length = ntoh24(hdr->dlength);
1506 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1507 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1509 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1510 (unsigned char *)hdr);
1512 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1513 (unsigned char *)hdr);
1516 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1517 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1518 " not set, protocol error.\n");
1520 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1521 (unsigned char *)hdr);
1523 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1524 (unsigned char *)hdr);
1527 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1528 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1529 " greater than MaxXmitDataSegmentLength: %u, protocol"
1530 " error.\n", payload_length,
1531 conn->conn_ops->MaxXmitDataSegmentLength);
1533 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1534 (unsigned char *)hdr);
1536 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1537 (unsigned char *)hdr);
1540 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1541 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1542 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1543 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1546 * This is not a response to a Unsolicited NopIN, which means
1547 * it can either be a NOPOUT ping request (with a valid ITT),
1548 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1549 * Either way, make sure we allocate an struct iscsi_cmd, as both
1550 * can contain ping data.
1552 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1553 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1554 cmd->i_state = ISTATE_SEND_NOPIN;
1555 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1557 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1558 cmd->targ_xfer_tag = 0xFFFFFFFF;
1559 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1560 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1561 cmd->data_direction = DMA_NONE;
1566 EXPORT_SYMBOL(iscsit_setup_nop_out);
1568 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1569 struct iscsi_nopout *hdr)
1571 struct iscsi_cmd *cmd_p = NULL;
1574 * Initiator is expecting a NopIN ping reply..
1576 if (hdr->itt != RESERVED_ITT) {
1579 spin_lock_bh(&conn->cmd_lock);
1580 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1581 spin_unlock_bh(&conn->cmd_lock);
1583 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1585 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1586 iscsit_add_cmd_to_response_queue(cmd, conn,
1591 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1592 (unsigned char *)hdr, hdr->cmdsn);
1593 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1595 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1601 * This was a response to a unsolicited NOPIN ping.
1603 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1604 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1608 iscsit_stop_nopin_response_timer(conn);
1610 cmd_p->i_state = ISTATE_REMOVE;
1611 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1613 iscsit_start_nopin_timer(conn);
1617 * Otherwise, initiator is not expecting a NOPIN is response.
1618 * Just ignore for now.
1622 EXPORT_SYMBOL(iscsit_process_nop_out);
1624 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1627 unsigned char *ping_data = NULL;
1628 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1629 struct kvec *iov = NULL;
1630 u32 payload_length = ntoh24(hdr->dlength);
1633 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1637 * Handle NOP-OUT payload for traditional iSCSI sockets
1639 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1640 u32 checksum, data_crc, padding = 0;
1641 int niov = 0, rx_got, rx_size = payload_length;
1643 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1645 pr_err("Unable to allocate memory for"
1646 " NOPOUT ping data.\n");
1651 iov = &cmd->iov_misc[0];
1652 iov[niov].iov_base = ping_data;
1653 iov[niov++].iov_len = payload_length;
1655 padding = ((-payload_length) & 3);
1657 pr_debug("Receiving %u additional bytes"
1658 " for padding.\n", padding);
1659 iov[niov].iov_base = &cmd->pad_bytes;
1660 iov[niov++].iov_len = padding;
1663 if (conn->conn_ops->DataDigest) {
1664 iov[niov].iov_base = &checksum;
1665 iov[niov++].iov_len = ISCSI_CRC_LEN;
1666 rx_size += ISCSI_CRC_LEN;
1669 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1670 if (rx_got != rx_size) {
1675 if (conn->conn_ops->DataDigest) {
1676 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1677 ping_data, payload_length,
1678 padding, cmd->pad_bytes,
1681 if (checksum != data_crc) {
1682 pr_err("Ping data CRC32C DataDigest"
1683 " 0x%08x does not match computed 0x%08x\n",
1684 checksum, data_crc);
1685 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1686 pr_err("Unable to recover from"
1687 " NOPOUT Ping DataCRC failure while in"
1693 * Silently drop this PDU and let the
1694 * initiator plug the CmdSN gap.
1696 pr_debug("Dropping NOPOUT"
1697 " Command CmdSN: 0x%08x due to"
1698 " DataCRC error.\n", hdr->cmdsn);
1703 pr_debug("Got CRC32C DataDigest"
1704 " 0x%08x for %u bytes of ping data.\n",
1705 checksum, payload_length);
1709 ping_data[payload_length] = '\0';
1711 * Attach ping data to struct iscsi_cmd->buf_ptr.
1713 cmd->buf_ptr = ping_data;
1714 cmd->buf_ptr_size = payload_length;
1716 pr_debug("Got %u bytes of NOPOUT ping"
1717 " data.\n", payload_length);
1718 pr_debug("Ping Data: \"%s\"\n", ping_data);
1721 return iscsit_process_nop_out(conn, cmd, hdr);
1724 iscsit_free_cmd(cmd, false);
1731 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1734 struct se_tmr_req *se_tmr;
1735 struct iscsi_tmr_req *tmr_req;
1736 struct iscsi_tm *hdr;
1737 int out_of_order_cmdsn = 0, ret;
1738 bool sess_ref = false;
1741 hdr = (struct iscsi_tm *) buf;
1742 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1743 function = hdr->flags;
1745 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1746 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1747 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1748 hdr->rtt, hdr->refcmdsn, conn->cid);
1750 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1751 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1752 hdr->rtt != RESERVED_ITT)) {
1753 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1754 hdr->rtt = RESERVED_ITT;
1757 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1758 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1759 pr_err("Task Management Request TASK_REASSIGN not"
1760 " issued as immediate command, bad iSCSI Initiator"
1761 "implementation\n");
1762 return iscsit_add_reject_cmd(cmd,
1763 ISCSI_REASON_PROTOCOL_ERROR, buf);
1765 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1766 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1767 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1769 cmd->data_direction = DMA_NONE;
1771 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1772 if (!cmd->tmr_req) {
1773 pr_err("Unable to allocate memory for"
1774 " Task Management command!\n");
1775 return iscsit_add_reject_cmd(cmd,
1776 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1781 * TASK_REASSIGN for ERL=2 / connection stays inside of
1782 * LIO-Target $FABRIC_MOD
1784 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1789 transport_init_se_cmd(&cmd->se_cmd,
1790 &lio_target_fabric_configfs->tf_ops,
1791 conn->sess->se_sess, 0, DMA_NONE,
1792 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1794 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1798 case ISCSI_TM_FUNC_ABORT_TASK:
1799 tcm_function = TMR_ABORT_TASK;
1801 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1802 tcm_function = TMR_ABORT_TASK_SET;
1804 case ISCSI_TM_FUNC_CLEAR_ACA:
1805 tcm_function = TMR_CLEAR_ACA;
1807 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1808 tcm_function = TMR_CLEAR_TASK_SET;
1810 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1811 tcm_function = TMR_LUN_RESET;
1813 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1814 tcm_function = TMR_TARGET_WARM_RESET;
1816 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1817 tcm_function = TMR_TARGET_COLD_RESET;
1820 pr_err("Unknown iSCSI TMR Function:"
1821 " 0x%02x\n", function);
1822 return iscsit_add_reject_cmd(cmd,
1823 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1826 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1827 tcm_function, GFP_KERNEL);
1829 return iscsit_add_reject_cmd(cmd,
1830 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1832 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1835 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1836 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1837 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1838 cmd->init_task_tag = hdr->itt;
1839 cmd->targ_xfer_tag = 0xFFFFFFFF;
1840 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1841 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1842 se_tmr = cmd->se_cmd.se_tmr_req;
1843 tmr_req = cmd->tmr_req;
1845 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1847 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1848 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1849 scsilun_to_int(&hdr->lun));
1851 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1857 case ISCSI_TM_FUNC_ABORT_TASK:
1858 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1859 if (se_tmr->response)
1862 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1863 case ISCSI_TM_FUNC_CLEAR_ACA:
1864 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1865 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1867 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1868 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1869 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1873 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1874 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1875 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1879 case ISCSI_TM_FUNC_TASK_REASSIGN:
1880 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1882 * Perform sanity checks on the ExpDataSN only if the
1883 * TASK_REASSIGN was successful.
1885 if (se_tmr->response)
1888 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1889 return iscsit_add_reject_cmd(cmd,
1890 ISCSI_REASON_BOOKMARK_INVALID, buf);
1893 pr_err("Unknown TMR function: 0x%02x, protocol"
1894 " error.\n", function);
1895 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1899 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1900 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1901 se_tmr->call_transport = 1;
1903 spin_lock_bh(&conn->cmd_lock);
1904 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1905 spin_unlock_bh(&conn->cmd_lock);
1907 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1908 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1909 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1910 out_of_order_cmdsn = 1;
1911 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1913 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1916 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1918 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1921 * Found the referenced task, send to transport for processing.
1923 if (se_tmr->call_transport)
1924 return transport_generic_handle_tmr(&cmd->se_cmd);
1927 * Could not find the referenced LUN, task, or Task Management
1928 * command not authorized or supported. Change state and
1929 * let the tx_thread send the response.
1931 * For connection recovery, this is also the default action for
1932 * TMR TASK_REASSIGN.
1935 pr_debug("Handle TMR, using sess_ref=true check\n");
1936 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1939 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1942 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1944 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1946 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1947 struct iscsi_text *hdr)
1949 u32 payload_length = ntoh24(hdr->dlength);
1951 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1952 pr_err("Unable to accept text parameter length: %u"
1953 "greater than MaxXmitDataSegmentLength %u.\n",
1954 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1955 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1956 (unsigned char *)hdr);
1959 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1960 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1961 pr_err("Multi sequence text commands currently not supported\n");
1962 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1963 (unsigned char *)hdr);
1966 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1967 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1968 hdr->exp_statsn, payload_length);
1970 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1971 cmd->i_state = ISTATE_SEND_TEXTRSP;
1972 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1973 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1974 cmd->targ_xfer_tag = 0xFFFFFFFF;
1975 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1976 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1977 cmd->data_direction = DMA_NONE;
1981 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1984 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1985 struct iscsi_text *hdr)
1987 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1991 pr_err("Unable to locate text_in buffer for sendtargets"
1995 if (strncmp("SendTargets", text_in, 11) != 0) {
1996 pr_err("Received Text Data that is not"
1997 " SendTargets, cannot continue.\n");
2000 text_ptr = strchr(text_in, '=');
2002 pr_err("No \"=\" separator found in Text Data,"
2003 " cannot continue.\n");
2006 if (!strncmp("=All", text_ptr, 4)) {
2007 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2008 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2009 !strncmp("=eui.", text_ptr, 5)) {
2010 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2012 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2016 spin_lock_bh(&conn->cmd_lock);
2017 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2018 spin_unlock_bh(&conn->cmd_lock);
2020 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2022 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2023 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2024 (unsigned char *)hdr, hdr->cmdsn);
2025 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2031 return iscsit_execute_cmd(cmd, 0);
2034 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2035 (unsigned char *)hdr);
2037 EXPORT_SYMBOL(iscsit_process_text_cmd);
2040 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2043 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2044 char *text_in = NULL;
2045 u32 payload_length = ntoh24(hdr->dlength);
2048 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2052 rx_size = payload_length;
2053 if (payload_length) {
2054 u32 checksum = 0, data_crc = 0;
2055 u32 padding = 0, pad_bytes = 0;
2056 int niov = 0, rx_got;
2059 text_in = kzalloc(payload_length, GFP_KERNEL);
2061 pr_err("Unable to allocate memory for"
2062 " incoming text parameters\n");
2065 cmd->text_in_ptr = text_in;
2067 memset(iov, 0, 3 * sizeof(struct kvec));
2068 iov[niov].iov_base = text_in;
2069 iov[niov++].iov_len = payload_length;
2071 padding = ((-payload_length) & 3);
2073 iov[niov].iov_base = &pad_bytes;
2074 iov[niov++].iov_len = padding;
2076 pr_debug("Receiving %u additional bytes"
2077 " for padding.\n", padding);
2079 if (conn->conn_ops->DataDigest) {
2080 iov[niov].iov_base = &checksum;
2081 iov[niov++].iov_len = ISCSI_CRC_LEN;
2082 rx_size += ISCSI_CRC_LEN;
2085 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2086 if (rx_got != rx_size)
2089 if (conn->conn_ops->DataDigest) {
2090 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2091 text_in, payload_length,
2092 padding, (u8 *)&pad_bytes,
2095 if (checksum != data_crc) {
2096 pr_err("Text data CRC32C DataDigest"
2097 " 0x%08x does not match computed"
2098 " 0x%08x\n", checksum, data_crc);
2099 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2100 pr_err("Unable to recover from"
2101 " Text Data digest failure while in"
2106 * Silently drop this PDU and let the
2107 * initiator plug the CmdSN gap.
2109 pr_debug("Dropping Text"
2110 " Command CmdSN: 0x%08x due to"
2111 " DataCRC error.\n", hdr->cmdsn);
2116 pr_debug("Got CRC32C DataDigest"
2117 " 0x%08x for %u bytes of text data.\n",
2118 checksum, payload_length);
2121 text_in[payload_length - 1] = '\0';
2122 pr_debug("Successfully read %d bytes of text"
2123 " data.\n", payload_length);
2126 return iscsit_process_text_cmd(conn, cmd, hdr);
2129 kfree(cmd->text_in_ptr);
2130 cmd->text_in_ptr = NULL;
2131 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2133 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2135 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2137 struct iscsi_conn *conn_p;
2138 struct iscsi_session *sess = conn->sess;
2140 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2141 " for SID: %u.\n", conn->cid, conn->sess->sid);
2143 atomic_set(&sess->session_logout, 1);
2144 atomic_set(&conn->conn_logout_remove, 1);
2145 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2147 iscsit_inc_conn_usage_count(conn);
2148 iscsit_inc_session_usage_count(sess);
2150 spin_lock_bh(&sess->conn_lock);
2151 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2152 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2155 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2156 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2158 spin_unlock_bh(&sess->conn_lock);
2160 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2165 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2167 struct iscsi_conn *l_conn;
2168 struct iscsi_session *sess = conn->sess;
2170 pr_debug("Received logout request CLOSECONNECTION for CID:"
2171 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2174 * A Logout Request with a CLOSECONNECTION reason code for a CID
2175 * can arrive on a connection with a differing CID.
2177 if (conn->cid == cmd->logout_cid) {
2178 spin_lock_bh(&conn->state_lock);
2179 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2180 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182 atomic_set(&conn->conn_logout_remove, 1);
2183 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2184 iscsit_inc_conn_usage_count(conn);
2186 spin_unlock_bh(&conn->state_lock);
2189 * Handle all different cid CLOSECONNECTION requests in
2190 * iscsit_logout_post_handler_diffcid() as to give enough
2191 * time for any non immediate command's CmdSN to be
2192 * acknowledged on the connection in question.
2194 * Here we simply make sure the CID is still around.
2196 l_conn = iscsit_get_conn_from_cid(sess,
2199 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2200 iscsit_add_cmd_to_response_queue(cmd, conn,
2205 iscsit_dec_conn_usage_count(l_conn);
2208 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2213 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2215 struct iscsi_session *sess = conn->sess;
2217 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2218 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2220 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2221 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2222 " while ERL!=2.\n");
2223 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2224 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2228 if (conn->cid == cmd->logout_cid) {
2229 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2230 " with CID: %hu on CID: %hu, implementation error.\n",
2231 cmd->logout_cid, conn->cid);
2232 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2233 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2237 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2243 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2246 int cmdsn_ret, logout_remove = 0;
2248 struct iscsi_logout *hdr;
2249 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2251 hdr = (struct iscsi_logout *) buf;
2252 reason_code = (hdr->flags & 0x7f);
2255 spin_lock(&tiqn->logout_stats.lock);
2256 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2257 tiqn->logout_stats.normal_logouts++;
2259 tiqn->logout_stats.abnormal_logouts++;
2260 spin_unlock(&tiqn->logout_stats.lock);
2263 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2264 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2265 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2266 hdr->cid, conn->cid);
2268 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2269 pr_err("Received logout request on connection that"
2270 " is not in logged in state, ignoring request.\n");
2271 iscsit_free_cmd(cmd, false);
2275 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2276 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2277 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2278 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2279 cmd->targ_xfer_tag = 0xFFFFFFFF;
2280 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2281 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2282 cmd->logout_cid = be16_to_cpu(hdr->cid);
2283 cmd->logout_reason = reason_code;
2284 cmd->data_direction = DMA_NONE;
2287 * We need to sleep in these cases (by returning 1) until the Logout
2288 * Response gets sent in the tx thread.
2290 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2291 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2292 be16_to_cpu(hdr->cid) == conn->cid))
2295 spin_lock_bh(&conn->cmd_lock);
2296 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2297 spin_unlock_bh(&conn->cmd_lock);
2299 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2300 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2303 * Immediate commands are executed, well, immediately.
2304 * Non-Immediate Logout Commands are executed in CmdSN order.
2306 if (cmd->immediate_cmd) {
2307 int ret = iscsit_execute_cmd(cmd, 0);
2312 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2313 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2315 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2319 return logout_remove;
2321 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2323 static int iscsit_handle_snack(
2324 struct iscsi_conn *conn,
2327 struct iscsi_snack *hdr;
2329 hdr = (struct iscsi_snack *) buf;
2330 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2332 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2333 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2334 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2335 hdr->begrun, hdr->runlength, conn->cid);
2337 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2338 pr_err("Initiator sent SNACK request while in"
2339 " ErrorRecoveryLevel=0.\n");
2340 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2344 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2345 * call from inside iscsi_send_recovery_datain_or_r2t().
2347 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2349 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2351 be32_to_cpu(hdr->ttt),
2352 be32_to_cpu(hdr->begrun),
2353 be32_to_cpu(hdr->runlength));
2354 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2355 return iscsit_handle_status_snack(conn, hdr->itt,
2356 be32_to_cpu(hdr->ttt),
2357 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2358 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2359 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2360 be32_to_cpu(hdr->begrun),
2361 be32_to_cpu(hdr->runlength));
2362 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2363 /* FIXME: Support R-Data SNACK */
2364 pr_err("R-Data SNACK Not Supported.\n");
2365 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2368 pr_err("Unknown SNACK type 0x%02x, protocol"
2369 " error.\n", hdr->flags & 0x0f);
2370 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2377 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2379 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2380 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2381 wait_for_completion_interruptible_timeout(
2382 &conn->rx_half_close_comp,
2383 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2387 static int iscsit_handle_immediate_data(
2388 struct iscsi_cmd *cmd,
2389 struct iscsi_scsi_req *hdr,
2392 int iov_ret, rx_got = 0, rx_size = 0;
2393 u32 checksum, iov_count = 0, padding = 0;
2394 struct iscsi_conn *conn = cmd->conn;
2397 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2399 return IMMEDIATE_DATA_CANNOT_RECOVER;
2402 iov_count = iov_ret;
2403 iov = &cmd->iov_data[0];
2405 padding = ((-length) & 3);
2407 iov[iov_count].iov_base = cmd->pad_bytes;
2408 iov[iov_count++].iov_len = padding;
2412 if (conn->conn_ops->DataDigest) {
2413 iov[iov_count].iov_base = &checksum;
2414 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2415 rx_size += ISCSI_CRC_LEN;
2418 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2420 iscsit_unmap_iovec(cmd);
2422 if (rx_got != rx_size) {
2423 iscsit_rx_thread_wait_for_tcp(conn);
2424 return IMMEDIATE_DATA_CANNOT_RECOVER;
2427 if (conn->conn_ops->DataDigest) {
2430 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2431 cmd->write_data_done, length, padding,
2434 if (checksum != data_crc) {
2435 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2436 " does not match computed 0x%08x\n", checksum,
2439 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2440 pr_err("Unable to recover from"
2441 " Immediate Data digest failure while"
2443 iscsit_reject_cmd(cmd,
2444 ISCSI_REASON_DATA_DIGEST_ERROR,
2445 (unsigned char *)hdr);
2446 return IMMEDIATE_DATA_CANNOT_RECOVER;
2448 iscsit_reject_cmd(cmd,
2449 ISCSI_REASON_DATA_DIGEST_ERROR,
2450 (unsigned char *)hdr);
2451 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2454 pr_debug("Got CRC32C DataDigest 0x%08x for"
2455 " %u bytes of Immediate Data\n", checksum,
2460 cmd->write_data_done += length;
2462 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2463 spin_lock_bh(&cmd->istate_lock);
2464 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2465 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2466 spin_unlock_bh(&cmd->istate_lock);
2469 return IMMEDIATE_DATA_NORMAL_OPERATION;
2473 * Called with sess->conn_lock held.
2475 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2476 with active network interface */
2477 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2479 struct iscsi_cmd *cmd;
2480 struct iscsi_conn *conn_p;
2483 * Only send a Asynchronous Message on connections whos network
2484 * interface is still functional.
2486 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2487 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2488 iscsit_inc_conn_usage_count(conn_p);
2496 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2498 iscsit_dec_conn_usage_count(conn_p);
2502 cmd->logout_cid = conn->cid;
2503 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2504 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2506 spin_lock_bh(&conn_p->cmd_lock);
2507 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2508 spin_unlock_bh(&conn_p->cmd_lock);
2510 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2511 iscsit_dec_conn_usage_count(conn_p);
2514 static int iscsit_send_conn_drop_async_message(
2515 struct iscsi_cmd *cmd,
2516 struct iscsi_conn *conn)
2518 struct iscsi_async *hdr;
2520 cmd->tx_size = ISCSI_HDR_LEN;
2521 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2523 hdr = (struct iscsi_async *) cmd->pdu;
2524 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2525 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2526 cmd->init_task_tag = RESERVED_ITT;
2527 cmd->targ_xfer_tag = 0xFFFFFFFF;
2528 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2529 cmd->stat_sn = conn->stat_sn++;
2530 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2531 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2532 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2533 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2534 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2535 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2536 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2538 if (conn->conn_ops->HeaderDigest) {
2539 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2541 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2542 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2544 cmd->tx_size += ISCSI_CRC_LEN;
2545 pr_debug("Attaching CRC32C HeaderDigest to"
2546 " Async Message 0x%08x\n", *header_digest);
2549 cmd->iov_misc[0].iov_base = cmd->pdu;
2550 cmd->iov_misc[0].iov_len = cmd->tx_size;
2551 cmd->iov_misc_count = 1;
2553 pr_debug("Sending Connection Dropped Async Message StatSN:"
2554 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2555 cmd->logout_cid, conn->cid);
2559 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2561 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2562 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2563 wait_for_completion_interruptible_timeout(
2564 &conn->tx_half_close_comp,
2565 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2570 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2571 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2574 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2575 hdr->flags = datain->flags;
2576 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2577 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2578 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2579 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2580 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2581 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2582 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2585 hton24(hdr->dlength, datain->length);
2586 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2587 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2588 (struct scsi_lun *)&hdr->lun);
2590 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2592 hdr->itt = cmd->init_task_tag;
2594 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2595 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2597 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2599 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2601 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2603 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2604 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2605 hdr->datasn = cpu_to_be32(datain->data_sn);
2606 hdr->offset = cpu_to_be32(datain->offset);
2608 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2609 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2610 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2611 ntohl(hdr->offset), datain->length, conn->cid);
2614 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2616 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2617 struct iscsi_datain datain;
2618 struct iscsi_datain_req *dr;
2620 u32 iov_count = 0, tx_size = 0;
2621 int eodr = 0, ret, iov_ret;
2622 bool set_statsn = false;
2624 memset(&datain, 0, sizeof(struct iscsi_datain));
2625 dr = iscsit_get_datain_values(cmd, &datain);
2627 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2628 cmd->init_task_tag);
2632 * Be paranoid and double check the logic for now.
2634 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2635 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2636 " datain.length: %u exceeds cmd->data_length: %u\n",
2637 cmd->init_task_tag, datain.offset, datain.length,
2638 cmd->se_cmd.data_length);
2642 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2644 * Special case for successfully execution w/ both DATAIN
2647 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2648 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2649 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2651 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2652 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2653 iscsit_increment_maxcmdsn(cmd, conn->sess);
2654 cmd->stat_sn = conn->stat_sn++;
2656 } else if (dr->dr_complete ==
2657 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2661 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2663 iov = &cmd->iov_data[0];
2664 iov[iov_count].iov_base = cmd->pdu;
2665 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2666 tx_size += ISCSI_HDR_LEN;
2668 if (conn->conn_ops->HeaderDigest) {
2669 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2671 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2672 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2674 iov[0].iov_len += ISCSI_CRC_LEN;
2675 tx_size += ISCSI_CRC_LEN;
2677 pr_debug("Attaching CRC32 HeaderDigest"
2678 " for DataIN PDU 0x%08x\n", *header_digest);
2681 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2682 datain.offset, datain.length);
2686 iov_count += iov_ret;
2687 tx_size += datain.length;
2689 cmd->padding = ((-datain.length) & 3);
2691 iov[iov_count].iov_base = cmd->pad_bytes;
2692 iov[iov_count++].iov_len = cmd->padding;
2693 tx_size += cmd->padding;
2695 pr_debug("Attaching %u padding bytes\n",
2698 if (conn->conn_ops->DataDigest) {
2699 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2700 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2702 iov[iov_count].iov_base = &cmd->data_crc;
2703 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2704 tx_size += ISCSI_CRC_LEN;
2706 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2707 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2710 cmd->iov_data_count = iov_count;
2711 cmd->tx_size = tx_size;
2713 /* sendpage is preferred but can't insert markers */
2714 if (!conn->conn_ops->IFMarker)
2715 ret = iscsit_fe_sendpage_sg(cmd, conn);
2717 ret = iscsit_send_tx_data(cmd, conn, 0);
2719 iscsit_unmap_iovec(cmd);
2722 iscsit_tx_thread_wait_for_tcp(conn);
2726 if (dr->dr_complete) {
2727 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2729 iscsit_free_datain_req(cmd, dr);
2736 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2737 struct iscsi_logout_rsp *hdr)
2739 struct iscsi_conn *logout_conn = NULL;
2740 struct iscsi_conn_recovery *cr = NULL;
2741 struct iscsi_session *sess = conn->sess;
2743 * The actual shutting down of Sessions and/or Connections
2744 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2745 * is done in scsi_logout_post_handler().
2747 switch (cmd->logout_reason) {
2748 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2749 pr_debug("iSCSI session logout successful, setting"
2750 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2751 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2753 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2754 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2757 * For CLOSECONNECTION logout requests carrying
2758 * a matching logout CID -> local CID, the reference
2759 * for the local CID will have been incremented in
2760 * iscsi_logout_closeconnection().
2762 * For CLOSECONNECTION logout requests carrying
2763 * a different CID than the connection it arrived
2764 * on, the connection responding to cmd->logout_cid
2765 * is stopped in iscsit_logout_post_handler_diffcid().
2768 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2769 " successful.\n", cmd->logout_cid, conn->cid);
2770 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2772 case ISCSI_LOGOUT_REASON_RECOVERY:
2773 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2774 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2777 * If the connection is still active from our point of view
2778 * force connection recovery to occur.
2780 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2783 iscsit_connection_reinstatement_rcfr(logout_conn);
2784 iscsit_dec_conn_usage_count(logout_conn);
2787 cr = iscsit_get_inactive_connection_recovery_entry(
2788 conn->sess, cmd->logout_cid);
2790 pr_err("Unable to locate CID: %hu for"
2791 " REMOVECONNFORRECOVERY Logout Request.\n",
2793 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2797 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2799 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2800 " for recovery for CID: %hu on CID: %hu successful.\n",
2801 cmd->logout_cid, conn->cid);
2802 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2805 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2806 cmd->logout_reason);
2810 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2811 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2812 hdr->response = cmd->logout_response;
2813 hdr->itt = cmd->init_task_tag;
2814 cmd->stat_sn = conn->stat_sn++;
2815 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2817 iscsit_increment_maxcmdsn(cmd, conn->sess);
2818 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2819 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2821 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2822 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2823 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2824 cmd->logout_cid, conn->cid);
2828 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2831 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2834 int niov = 0, tx_size, rc;
2836 rc = iscsit_build_logout_rsp(cmd, conn,
2837 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2841 tx_size = ISCSI_HDR_LEN;
2842 iov = &cmd->iov_misc[0];
2843 iov[niov].iov_base = cmd->pdu;
2844 iov[niov++].iov_len = ISCSI_HDR_LEN;
2846 if (conn->conn_ops->HeaderDigest) {
2847 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2849 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2850 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2852 iov[0].iov_len += ISCSI_CRC_LEN;
2853 tx_size += ISCSI_CRC_LEN;
2854 pr_debug("Attaching CRC32C HeaderDigest to"
2855 " Logout Response 0x%08x\n", *header_digest);
2857 cmd->iov_misc_count = niov;
2858 cmd->tx_size = tx_size;
2864 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2865 struct iscsi_nopin *hdr, bool nopout_response)
2867 hdr->opcode = ISCSI_OP_NOOP_IN;
2868 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2869 hton24(hdr->dlength, cmd->buf_ptr_size);
2870 if (nopout_response)
2871 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2872 hdr->itt = cmd->init_task_tag;
2873 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2874 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2876 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2878 if (nopout_response)
2879 iscsit_increment_maxcmdsn(cmd, conn->sess);
2881 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2882 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2884 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2885 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2886 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2887 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2889 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2892 * Unsolicited NOPIN, either requesting a response or not.
2894 static int iscsit_send_unsolicited_nopin(
2895 struct iscsi_cmd *cmd,
2896 struct iscsi_conn *conn,
2899 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2900 int tx_size = ISCSI_HDR_LEN, ret;
2902 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2904 if (conn->conn_ops->HeaderDigest) {
2905 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2907 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2908 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2910 tx_size += ISCSI_CRC_LEN;
2911 pr_debug("Attaching CRC32C HeaderDigest to"
2912 " NopIN 0x%08x\n", *header_digest);
2915 cmd->iov_misc[0].iov_base = cmd->pdu;
2916 cmd->iov_misc[0].iov_len = tx_size;
2917 cmd->iov_misc_count = 1;
2918 cmd->tx_size = tx_size;
2920 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2921 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2923 ret = iscsit_send_tx_data(cmd, conn, 1);
2925 iscsit_tx_thread_wait_for_tcp(conn);
2929 spin_lock_bh(&cmd->istate_lock);
2930 cmd->i_state = want_response ?
2931 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2932 spin_unlock_bh(&cmd->istate_lock);
2938 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2940 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2943 int niov = 0, tx_size;
2945 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2947 tx_size = ISCSI_HDR_LEN;
2948 iov = &cmd->iov_misc[0];
2949 iov[niov].iov_base = cmd->pdu;
2950 iov[niov++].iov_len = ISCSI_HDR_LEN;
2952 if (conn->conn_ops->HeaderDigest) {
2953 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2955 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2956 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2958 iov[0].iov_len += ISCSI_CRC_LEN;
2959 tx_size += ISCSI_CRC_LEN;
2960 pr_debug("Attaching CRC32C HeaderDigest"
2961 " to NopIn 0x%08x\n", *header_digest);
2965 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2966 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2968 if (cmd->buf_ptr_size) {
2969 iov[niov].iov_base = cmd->buf_ptr;
2970 iov[niov++].iov_len = cmd->buf_ptr_size;
2971 tx_size += cmd->buf_ptr_size;
2973 pr_debug("Echoing back %u bytes of ping"
2974 " data.\n", cmd->buf_ptr_size);
2976 padding = ((-cmd->buf_ptr_size) & 3);
2978 iov[niov].iov_base = &cmd->pad_bytes;
2979 iov[niov++].iov_len = padding;
2981 pr_debug("Attaching %u additional"
2982 " padding bytes.\n", padding);
2984 if (conn->conn_ops->DataDigest) {
2985 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2986 cmd->buf_ptr, cmd->buf_ptr_size,
2987 padding, (u8 *)&cmd->pad_bytes,
2988 (u8 *)&cmd->data_crc);
2990 iov[niov].iov_base = &cmd->data_crc;
2991 iov[niov++].iov_len = ISCSI_CRC_LEN;
2992 tx_size += ISCSI_CRC_LEN;
2993 pr_debug("Attached DataDigest for %u"
2994 " bytes of ping data, CRC 0x%08x\n",
2995 cmd->buf_ptr_size, cmd->data_crc);
2999 cmd->iov_misc_count = niov;
3000 cmd->tx_size = tx_size;
3005 static int iscsit_send_r2t(
3006 struct iscsi_cmd *cmd,
3007 struct iscsi_conn *conn)
3010 struct iscsi_r2t *r2t;
3011 struct iscsi_r2t_rsp *hdr;
3014 r2t = iscsit_get_r2t_from_list(cmd);
3018 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3019 memset(hdr, 0, ISCSI_HDR_LEN);
3020 hdr->opcode = ISCSI_OP_R2T;
3021 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3022 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3023 (struct scsi_lun *)&hdr->lun);
3024 hdr->itt = cmd->init_task_tag;
3025 spin_lock_bh(&conn->sess->ttt_lock);
3026 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3027 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3028 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3029 spin_unlock_bh(&conn->sess->ttt_lock);
3030 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3031 hdr->statsn = cpu_to_be32(conn->stat_sn);
3032 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3033 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3034 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3035 hdr->data_offset = cpu_to_be32(r2t->offset);
3036 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3038 cmd->iov_misc[0].iov_base = cmd->pdu;
3039 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3040 tx_size += ISCSI_HDR_LEN;
3042 if (conn->conn_ops->HeaderDigest) {
3043 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3045 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3046 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3048 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3049 tx_size += ISCSI_CRC_LEN;
3050 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3051 " PDU 0x%08x\n", *header_digest);
3054 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3055 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3056 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3057 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3058 r2t->offset, r2t->xfer_len, conn->cid);
3060 cmd->iov_misc_count = 1;
3061 cmd->tx_size = tx_size;
3063 spin_lock_bh(&cmd->r2t_lock);
3065 spin_unlock_bh(&cmd->r2t_lock);
3067 ret = iscsit_send_tx_data(cmd, conn, 1);
3069 iscsit_tx_thread_wait_for_tcp(conn);
3073 spin_lock_bh(&cmd->dataout_timeout_lock);
3074 iscsit_start_dataout_timer(cmd, conn);
3075 spin_unlock_bh(&cmd->dataout_timeout_lock);
3081 * @recovery: If called from iscsi_task_reassign_complete_write() for
3082 * connection recovery.
3084 int iscsit_build_r2ts_for_cmd(
3085 struct iscsi_conn *conn,
3086 struct iscsi_cmd *cmd,
3090 u32 offset = 0, xfer_len = 0;
3092 spin_lock_bh(&cmd->r2t_lock);
3093 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3094 spin_unlock_bh(&cmd->r2t_lock);
3098 if (conn->sess->sess_ops->DataSequenceInOrder &&
3100 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3102 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3103 if (conn->sess->sess_ops->DataSequenceInOrder) {
3104 offset = cmd->r2t_offset;
3106 if (first_r2t && recovery) {
3107 int new_data_end = offset +
3108 conn->sess->sess_ops->MaxBurstLength -
3109 cmd->next_burst_len;
3111 if (new_data_end > cmd->se_cmd.data_length)
3112 xfer_len = cmd->se_cmd.data_length - offset;
3115 conn->sess->sess_ops->MaxBurstLength -
3116 cmd->next_burst_len;
3118 int new_data_end = offset +
3119 conn->sess->sess_ops->MaxBurstLength;
3121 if (new_data_end > cmd->se_cmd.data_length)
3122 xfer_len = cmd->se_cmd.data_length - offset;
3124 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3126 cmd->r2t_offset += xfer_len;
3128 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3129 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3131 struct iscsi_seq *seq;
3133 seq = iscsit_get_seq_holder_for_r2t(cmd);
3135 spin_unlock_bh(&cmd->r2t_lock);
3139 offset = seq->offset;
3140 xfer_len = seq->xfer_len;
3142 if (cmd->seq_send_order == cmd->seq_count)
3143 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3145 cmd->outstanding_r2ts++;
3148 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3149 spin_unlock_bh(&cmd->r2t_lock);
3153 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3156 spin_unlock_bh(&cmd->r2t_lock);
3161 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3162 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3165 cmd->stat_sn = conn->stat_sn++;
3167 atomic_long_inc(&conn->sess->rsp_pdus);
3169 memset(hdr, 0, ISCSI_HDR_LEN);
3170 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3171 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3172 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3173 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3174 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3175 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3176 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3177 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3179 hdr->response = cmd->iscsi_response;
3180 hdr->cmd_status = cmd->se_cmd.scsi_status;
3181 hdr->itt = cmd->init_task_tag;
3182 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3184 iscsit_increment_maxcmdsn(cmd, conn->sess);
3185 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3186 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3188 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3189 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3190 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3191 cmd->se_cmd.scsi_status, conn->cid);
3193 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3195 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3197 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3199 u32 padding = 0, tx_size = 0;
3201 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3203 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3205 iov = &cmd->iov_misc[0];
3206 iov[iov_count].iov_base = cmd->pdu;
3207 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3208 tx_size += ISCSI_HDR_LEN;
3211 * Attach SENSE DATA payload to iSCSI Response PDU
3213 if (cmd->se_cmd.sense_buffer &&
3214 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3215 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3216 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3217 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3219 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3220 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3221 iov[iov_count].iov_base = cmd->sense_buffer;
3222 iov[iov_count++].iov_len =
3223 (cmd->se_cmd.scsi_sense_length + padding);
3224 tx_size += cmd->se_cmd.scsi_sense_length;
3227 memset(cmd->sense_buffer +
3228 cmd->se_cmd.scsi_sense_length, 0, padding);
3230 pr_debug("Adding %u bytes of padding to"
3231 " SENSE.\n", padding);
3234 if (conn->conn_ops->DataDigest) {
3235 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3237 (cmd->se_cmd.scsi_sense_length + padding),
3238 0, NULL, (u8 *)&cmd->data_crc);
3240 iov[iov_count].iov_base = &cmd->data_crc;
3241 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3242 tx_size += ISCSI_CRC_LEN;
3244 pr_debug("Attaching CRC32 DataDigest for"
3245 " SENSE, %u bytes CRC 0x%08x\n",
3246 (cmd->se_cmd.scsi_sense_length + padding),
3250 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3252 cmd->se_cmd.scsi_sense_length);
3255 if (conn->conn_ops->HeaderDigest) {
3256 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3258 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3259 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3261 iov[0].iov_len += ISCSI_CRC_LEN;
3262 tx_size += ISCSI_CRC_LEN;
3263 pr_debug("Attaching CRC32 HeaderDigest for Response"
3264 " PDU 0x%08x\n", *header_digest);
3267 cmd->iov_misc_count = iov_count;
3268 cmd->tx_size = tx_size;
3273 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3275 switch (se_tmr->response) {
3276 case TMR_FUNCTION_COMPLETE:
3277 return ISCSI_TMF_RSP_COMPLETE;
3278 case TMR_TASK_DOES_NOT_EXIST:
3279 return ISCSI_TMF_RSP_NO_TASK;
3280 case TMR_LUN_DOES_NOT_EXIST:
3281 return ISCSI_TMF_RSP_NO_LUN;
3282 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3283 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3284 case TMR_FUNCTION_REJECTED:
3286 return ISCSI_TMF_RSP_REJECTED;
3291 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3292 struct iscsi_tm_rsp *hdr)
3294 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3296 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3297 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3298 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3299 hdr->itt = cmd->init_task_tag;
3300 cmd->stat_sn = conn->stat_sn++;
3301 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3303 iscsit_increment_maxcmdsn(cmd, conn->sess);
3304 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3305 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3307 pr_debug("Built Task Management Response ITT: 0x%08x,"
3308 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3309 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3311 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3314 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3316 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3319 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3321 cmd->iov_misc[0].iov_base = cmd->pdu;
3322 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3323 tx_size += ISCSI_HDR_LEN;
3325 if (conn->conn_ops->HeaderDigest) {
3326 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3328 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3329 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3331 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3332 tx_size += ISCSI_CRC_LEN;
3333 pr_debug("Attaching CRC32 HeaderDigest for Task"
3334 " Mgmt Response PDU 0x%08x\n", *header_digest);
3337 cmd->iov_misc_count = 1;
3338 cmd->tx_size = tx_size;
3343 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3347 if (np->np_sockaddr.ss_family == AF_INET6) {
3348 const struct sockaddr_in6 sin6 = {
3349 .sin6_addr = IN6ADDR_ANY_INIT };
3350 struct sockaddr_in6 *sock_in6 =
3351 (struct sockaddr_in6 *)&np->np_sockaddr;
3353 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3354 sin6.sin6_addr.s6_addr, 16))
3357 struct sockaddr_in * sock_in =
3358 (struct sockaddr_in *)&np->np_sockaddr;
3360 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3367 #define SENDTARGETS_BUF_LIMIT 32768U
3369 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3371 char *payload = NULL;
3372 struct iscsi_conn *conn = cmd->conn;
3373 struct iscsi_portal_group *tpg;
3374 struct iscsi_tiqn *tiqn;
3375 struct iscsi_tpg_np *tpg_np;
3376 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3377 int target_name_printed;
3378 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3379 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3381 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3382 SENDTARGETS_BUF_LIMIT);
3384 payload = kzalloc(buffer_len, GFP_KERNEL);
3386 pr_err("Unable to allocate memory for sendtargets"
3391 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3394 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3395 text_ptr = strchr(text_in, '=');
3397 pr_err("Unable to locate '=' string in text_in:"
3403 * Skip over '=' character..
3408 spin_lock(&tiqn_lock);
3409 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3410 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3411 strcmp(tiqn->tiqn, text_ptr)) {
3415 target_name_printed = 0;
3417 spin_lock(&tiqn->tiqn_tpg_lock);
3418 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3420 /* If demo_mode_discovery=0 and generate_node_acls=0
3421 * (demo mode dislabed) do not return
3422 * TargetName+TargetAddress unless a NodeACL exists.
3425 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3426 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3427 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3428 cmd->conn->sess->sess_ops->InitiatorName))) {
3432 spin_lock(&tpg->tpg_state_lock);
3433 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3434 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3435 spin_unlock(&tpg->tpg_state_lock);
3438 spin_unlock(&tpg->tpg_state_lock);
3440 spin_lock(&tpg->tpg_np_lock);
3441 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3443 struct iscsi_np *np = tpg_np->tpg_np;
3444 bool inaddr_any = iscsit_check_inaddr_any(np);
3446 if (!target_name_printed) {
3447 len = sprintf(buf, "TargetName=%s",
3451 if ((len + payload_len) > buffer_len) {
3452 spin_unlock(&tpg->tpg_np_lock);
3453 spin_unlock(&tiqn->tiqn_tpg_lock);
3457 memcpy(payload + payload_len, buf, len);
3459 target_name_printed = 1;
3462 len = sprintf(buf, "TargetAddress="
3464 (inaddr_any == false) ?
3465 np->np_ip : conn->local_ip,
3466 (inaddr_any == false) ?
3467 np->np_port : conn->local_port,
3471 if ((len + payload_len) > buffer_len) {
3472 spin_unlock(&tpg->tpg_np_lock);
3473 spin_unlock(&tiqn->tiqn_tpg_lock);
3477 memcpy(payload + payload_len, buf, len);
3480 spin_unlock(&tpg->tpg_np_lock);
3482 spin_unlock(&tiqn->tiqn_tpg_lock);
3487 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3490 spin_unlock(&tiqn_lock);
3492 cmd->buf_ptr = payload;
3498 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3499 struct iscsi_text_rsp *hdr)
3501 int text_length, padding;
3503 text_length = iscsit_build_sendtargets_response(cmd);
3504 if (text_length < 0)
3507 hdr->opcode = ISCSI_OP_TEXT_RSP;
3508 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3509 padding = ((-text_length) & 3);
3510 hton24(hdr->dlength, text_length);
3511 hdr->itt = cmd->init_task_tag;
3512 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3513 cmd->stat_sn = conn->stat_sn++;
3514 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3516 iscsit_increment_maxcmdsn(cmd, conn->sess);
3517 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3518 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3520 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3521 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3522 text_length, conn->cid);
3524 return text_length + padding;
3526 EXPORT_SYMBOL(iscsit_build_text_rsp);
3529 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3530 * MaxRecvDataSegmentLength.
3532 static int iscsit_send_text_rsp(
3533 struct iscsi_cmd *cmd,
3534 struct iscsi_conn *conn)
3536 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3539 int text_length, iov_count = 0, rc;
3541 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3546 iov = &cmd->iov_misc[0];
3547 iov[iov_count].iov_base = cmd->pdu;
3548 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3549 iov[iov_count].iov_base = cmd->buf_ptr;
3550 iov[iov_count++].iov_len = text_length;
3552 tx_size += (ISCSI_HDR_LEN + text_length);
3554 if (conn->conn_ops->HeaderDigest) {
3555 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3557 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3558 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3560 iov[0].iov_len += ISCSI_CRC_LEN;
3561 tx_size += ISCSI_CRC_LEN;
3562 pr_debug("Attaching CRC32 HeaderDigest for"
3563 " Text Response PDU 0x%08x\n", *header_digest);
3566 if (conn->conn_ops->DataDigest) {
3567 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3568 cmd->buf_ptr, text_length,
3569 0, NULL, (u8 *)&cmd->data_crc);
3571 iov[iov_count].iov_base = &cmd->data_crc;
3572 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3573 tx_size += ISCSI_CRC_LEN;
3575 pr_debug("Attaching DataDigest for %u bytes of text"
3576 " data, CRC 0x%08x\n", text_length,
3580 cmd->iov_misc_count = iov_count;
3581 cmd->tx_size = tx_size;
3587 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3588 struct iscsi_reject *hdr)
3590 hdr->opcode = ISCSI_OP_REJECT;
3591 hdr->reason = cmd->reject_reason;
3592 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3593 hton24(hdr->dlength, ISCSI_HDR_LEN);
3594 hdr->ffffffff = cpu_to_be32(0xffffffff);
3595 cmd->stat_sn = conn->stat_sn++;
3596 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3597 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3598 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3601 EXPORT_SYMBOL(iscsit_build_reject);
3603 static int iscsit_send_reject(
3604 struct iscsi_cmd *cmd,
3605 struct iscsi_conn *conn)
3607 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3609 u32 iov_count = 0, tx_size;
3611 iscsit_build_reject(cmd, conn, hdr);
3613 iov = &cmd->iov_misc[0];
3614 iov[iov_count].iov_base = cmd->pdu;
3615 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3616 iov[iov_count].iov_base = cmd->buf_ptr;
3617 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3619 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3621 if (conn->conn_ops->HeaderDigest) {
3622 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3624 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3625 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3627 iov[0].iov_len += ISCSI_CRC_LEN;
3628 tx_size += ISCSI_CRC_LEN;
3629 pr_debug("Attaching CRC32 HeaderDigest for"
3630 " REJECT PDU 0x%08x\n", *header_digest);
3633 if (conn->conn_ops->DataDigest) {
3634 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3635 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3637 iov[iov_count].iov_base = &cmd->data_crc;
3638 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3639 tx_size += ISCSI_CRC_LEN;
3640 pr_debug("Attaching CRC32 DataDigest for REJECT"
3641 " PDU 0x%08x\n", cmd->data_crc);
3644 cmd->iov_misc_count = iov_count;
3645 cmd->tx_size = tx_size;
3647 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3648 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3653 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3655 struct iscsi_thread_set *ts = conn->thread_set;
3658 * thread_id is assigned from iscsit_global->ts_bitmap from
3659 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3661 * Here we use thread_id to determine which CPU that this
3662 * iSCSI connection's iscsi_thread_set will be scheduled to
3665 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3666 for_each_online_cpu(cpu) {
3668 cpumask_set_cpu(cpu, conn->conn_cpumask);
3673 * This should never be reached..
3676 cpumask_setall(conn->conn_cpumask);
3679 static inline void iscsit_thread_check_cpumask(
3680 struct iscsi_conn *conn,
3681 struct task_struct *p,
3686 * mode == 1 signals iscsi_target_tx_thread() usage.
3687 * mode == 0 signals iscsi_target_rx_thread() usage.
3690 if (!conn->conn_tx_reset_cpumask)
3692 conn->conn_tx_reset_cpumask = 0;
3694 if (!conn->conn_rx_reset_cpumask)
3696 conn->conn_rx_reset_cpumask = 0;
3699 * Update the CPU mask for this single kthread so that
3700 * both TX and RX kthreads are scheduled to run on the
3703 memset(buf, 0, 128);
3704 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3705 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3709 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3714 case ISTATE_SEND_R2T:
3715 ret = iscsit_send_r2t(cmd, conn);
3720 spin_lock_bh(&conn->cmd_lock);
3721 list_del_init(&cmd->i_conn_node);
3722 spin_unlock_bh(&conn->cmd_lock);
3724 iscsit_free_cmd(cmd, false);
3726 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3727 iscsit_mod_nopin_response_timer(conn);
3728 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3732 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3733 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3738 pr_err("Unknown Opcode: 0x%02x ITT:"
3739 " 0x%08x, i_state: %d on CID: %hu\n",
3740 cmd->iscsi_opcode, cmd->init_task_tag, state,
3752 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3754 struct iscsit_transport *t = conn->conn_transport;
3755 struct iscsi_queue_req *qr;
3756 struct iscsi_cmd *cmd;
3760 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3761 atomic_set(&conn->check_immediate_queue, 0);
3764 kmem_cache_free(lio_qr_cache, qr);
3766 ret = t->iscsit_immediate_queue(conn, cmd, state);
3775 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3781 case ISTATE_SEND_DATAIN:
3782 ret = iscsit_send_datain(cmd, conn);
3787 goto check_rsp_state;
3788 else if (ret == 1) {
3790 spin_lock_bh(&cmd->istate_lock);
3791 cmd->i_state = ISTATE_SENT_STATUS;
3792 spin_unlock_bh(&cmd->istate_lock);
3794 if (atomic_read(&conn->check_immediate_queue))
3798 } else if (ret == 2) {
3799 /* Still must send status,
3800 SCF_TRANSPORT_TASK_SENSE was set */
3801 spin_lock_bh(&cmd->istate_lock);
3802 cmd->i_state = ISTATE_SEND_STATUS;
3803 spin_unlock_bh(&cmd->istate_lock);
3804 state = ISTATE_SEND_STATUS;
3805 goto check_rsp_state;
3809 case ISTATE_SEND_STATUS:
3810 case ISTATE_SEND_STATUS_RECOVERY:
3811 ret = iscsit_send_response(cmd, conn);
3813 case ISTATE_SEND_LOGOUTRSP:
3814 ret = iscsit_send_logout(cmd, conn);
3816 case ISTATE_SEND_ASYNCMSG:
3817 ret = iscsit_send_conn_drop_async_message(
3820 case ISTATE_SEND_NOPIN:
3821 ret = iscsit_send_nopin(cmd, conn);
3823 case ISTATE_SEND_REJECT:
3824 ret = iscsit_send_reject(cmd, conn);
3826 case ISTATE_SEND_TASKMGTRSP:
3827 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3830 ret = iscsit_tmr_post_handler(cmd, conn);
3832 iscsit_fall_back_to_erl0(conn->sess);
3834 case ISTATE_SEND_TEXTRSP:
3835 ret = iscsit_send_text_rsp(cmd, conn);
3838 pr_err("Unknown Opcode: 0x%02x ITT:"
3839 " 0x%08x, i_state: %d on CID: %hu\n",
3840 cmd->iscsi_opcode, cmd->init_task_tag,
3847 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3848 iscsit_tx_thread_wait_for_tcp(conn);
3849 iscsit_unmap_iovec(cmd);
3852 iscsit_unmap_iovec(cmd);
3855 case ISTATE_SEND_LOGOUTRSP:
3856 if (!iscsit_logout_post_handler(cmd, conn))
3859 case ISTATE_SEND_STATUS:
3860 case ISTATE_SEND_ASYNCMSG:
3861 case ISTATE_SEND_NOPIN:
3862 case ISTATE_SEND_STATUS_RECOVERY:
3863 case ISTATE_SEND_TEXTRSP:
3864 case ISTATE_SEND_TASKMGTRSP:
3865 case ISTATE_SEND_REJECT:
3866 spin_lock_bh(&cmd->istate_lock);
3867 cmd->i_state = ISTATE_SENT_STATUS;
3868 spin_unlock_bh(&cmd->istate_lock);
3871 pr_err("Unknown Opcode: 0x%02x ITT:"
3872 " 0x%08x, i_state: %d on CID: %hu\n",
3873 cmd->iscsi_opcode, cmd->init_task_tag,
3874 cmd->i_state, conn->cid);
3878 if (atomic_read(&conn->check_immediate_queue))
3889 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3891 struct iscsit_transport *t = conn->conn_transport;
3892 struct iscsi_queue_req *qr;
3893 struct iscsi_cmd *cmd;
3897 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3900 kmem_cache_free(lio_qr_cache, qr);
3902 ret = t->iscsit_response_queue(conn, cmd, state);
3903 if (ret == 1 || ret < 0)
3910 int iscsi_target_tx_thread(void *arg)
3913 struct iscsi_conn *conn;
3914 struct iscsi_thread_set *ts = arg;
3916 * Allow ourselves to be interrupted by SIGINT so that a
3917 * connection recovery / failure event can be triggered externally.
3919 allow_signal(SIGINT);
3922 conn = iscsi_tx_thread_pre_handler(ts);
3928 while (!kthread_should_stop()) {
3930 * Ensure that both TX and RX per connection kthreads
3931 * are scheduled to run on the same CPU.
3933 iscsit_thread_check_cpumask(conn, current, 1);
3935 wait_event_interruptible(conn->queues_wq,
3936 !iscsit_conn_all_queues_empty(conn) ||
3937 ts->status == ISCSI_THREAD_SET_RESET);
3939 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3940 signal_pending(current))
3944 ret = iscsit_handle_immediate_queue(conn);
3948 ret = iscsit_handle_response_queue(conn);
3951 else if (ret == -EAGAIN)
3958 iscsit_take_action_for_connection_exit(conn);
3964 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3966 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3967 struct iscsi_cmd *cmd;
3970 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3971 case ISCSI_OP_SCSI_CMD:
3972 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3976 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3978 case ISCSI_OP_SCSI_DATA_OUT:
3979 ret = iscsit_handle_data_out(conn, buf);
3981 case ISCSI_OP_NOOP_OUT:
3983 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3984 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3988 ret = iscsit_handle_nop_out(conn, cmd, buf);
3990 case ISCSI_OP_SCSI_TMFUNC:
3991 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3995 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3998 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4002 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4004 case ISCSI_OP_LOGOUT:
4005 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4009 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4011 wait_for_completion_timeout(&conn->conn_logout_comp,
4012 SECONDS_FOR_LOGOUT_COMP * HZ);
4014 case ISCSI_OP_SNACK:
4015 ret = iscsit_handle_snack(conn, buf);
4018 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4019 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4020 pr_err("Cannot recover from unknown"
4021 " opcode while ERL=0, closing iSCSI connection.\n");
4024 if (!conn->conn_ops->OFMarker) {
4025 pr_err("Unable to recover from unknown"
4026 " opcode while OFMarker=No, closing iSCSI"
4030 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4031 pr_err("Unable to recover from unknown"
4032 " opcode, closing iSCSI connection.\n");
4040 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4043 int iscsi_target_rx_thread(void *arg)
4046 u8 buffer[ISCSI_HDR_LEN], opcode;
4047 u32 checksum = 0, digest = 0;
4048 struct iscsi_conn *conn = NULL;
4049 struct iscsi_thread_set *ts = arg;
4052 * Allow ourselves to be interrupted by SIGINT so that a
4053 * connection recovery / failure event can be triggered externally.
4055 allow_signal(SIGINT);
4058 conn = iscsi_rx_thread_pre_handler(ts);
4062 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4063 struct completion comp;
4066 init_completion(&comp);
4067 rc = wait_for_completion_interruptible(&comp);
4074 while (!kthread_should_stop()) {
4076 * Ensure that both TX and RX per connection kthreads
4077 * are scheduled to run on the same CPU.
4079 iscsit_thread_check_cpumask(conn, current, 0);
4081 memset(buffer, 0, ISCSI_HDR_LEN);
4082 memset(&iov, 0, sizeof(struct kvec));
4084 iov.iov_base = buffer;
4085 iov.iov_len = ISCSI_HDR_LEN;
4087 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4088 if (ret != ISCSI_HDR_LEN) {
4089 iscsit_rx_thread_wait_for_tcp(conn);
4093 if (conn->conn_ops->HeaderDigest) {
4094 iov.iov_base = &digest;
4095 iov.iov_len = ISCSI_CRC_LEN;
4097 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4098 if (ret != ISCSI_CRC_LEN) {
4099 iscsit_rx_thread_wait_for_tcp(conn);
4103 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4104 buffer, ISCSI_HDR_LEN,
4105 0, NULL, (u8 *)&checksum);
4107 if (digest != checksum) {
4108 pr_err("HeaderDigest CRC32C failed,"
4109 " received 0x%08x, computed 0x%08x\n",
4112 * Set the PDU to 0xff so it will intentionally
4113 * hit default in the switch below.
4115 memset(buffer, 0xff, ISCSI_HDR_LEN);
4116 atomic_long_inc(&conn->sess->conn_digest_errors);
4118 pr_debug("Got HeaderDigest CRC32C"
4119 " 0x%08x\n", checksum);
4123 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4126 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4128 if (conn->sess->sess_ops->SessionType &&
4129 ((!(opcode & ISCSI_OP_TEXT)) ||
4130 (!(opcode & ISCSI_OP_LOGOUT)))) {
4131 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4132 " while in Discovery Session, rejecting.\n", opcode);
4133 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4138 ret = iscsi_target_rx_opcode(conn, buffer);
4144 if (!signal_pending(current))
4145 atomic_set(&conn->transport_failed, 1);
4146 iscsit_take_action_for_connection_exit(conn);
4152 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4154 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4155 struct iscsi_session *sess = conn->sess;
4157 * We expect this function to only ever be called from either RX or TX
4158 * thread context via iscsit_close_connection() once the other context
4159 * has been reset -> returned sleeping pre-handler state.
4161 spin_lock_bh(&conn->cmd_lock);
4162 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4164 list_del_init(&cmd->i_conn_node);
4165 spin_unlock_bh(&conn->cmd_lock);
4167 iscsit_increment_maxcmdsn(cmd, sess);
4169 iscsit_free_cmd(cmd, true);
4171 spin_lock_bh(&conn->cmd_lock);
4173 spin_unlock_bh(&conn->cmd_lock);
4176 static void iscsit_stop_timers_for_cmds(
4177 struct iscsi_conn *conn)
4179 struct iscsi_cmd *cmd;
4181 spin_lock_bh(&conn->cmd_lock);
4182 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4183 if (cmd->data_direction == DMA_TO_DEVICE)
4184 iscsit_stop_dataout_timer(cmd);
4186 spin_unlock_bh(&conn->cmd_lock);
4189 int iscsit_close_connection(
4190 struct iscsi_conn *conn)
4192 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4193 struct iscsi_session *sess = conn->sess;
4195 pr_debug("Closing iSCSI connection CID %hu on SID:"
4196 " %u\n", conn->cid, sess->sid);
4198 * Always up conn_logout_comp just in case the RX Thread is sleeping
4199 * and the logout response never got sent because the connection
4202 complete(&conn->conn_logout_comp);
4204 iscsi_release_thread_set(conn);
4206 iscsit_stop_timers_for_cmds(conn);
4207 iscsit_stop_nopin_response_timer(conn);
4208 iscsit_stop_nopin_timer(conn);
4210 if (conn->conn_transport->iscsit_wait_conn)
4211 conn->conn_transport->iscsit_wait_conn(conn);
4213 iscsit_free_queue_reqs_for_conn(conn);
4216 * During Connection recovery drop unacknowledged out of order
4217 * commands for this connection, and prepare the other commands
4220 * During normal operation clear the out of order commands (but
4221 * do not free the struct iscsi_ooo_cmdsn's) and release all
4222 * struct iscsi_cmds.
4224 if (atomic_read(&conn->connection_recovery)) {
4225 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4226 iscsit_prepare_cmds_for_realligance(conn);
4228 iscsit_clear_ooo_cmdsns_for_conn(conn);
4229 iscsit_release_commands_from_conn(conn);
4233 * Handle decrementing session or connection usage count if
4234 * a logout response was not able to be sent because the
4235 * connection failed. Fall back to Session Recovery here.
4237 if (atomic_read(&conn->conn_logout_remove)) {
4238 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4239 iscsit_dec_conn_usage_count(conn);
4240 iscsit_dec_session_usage_count(sess);
4242 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4243 iscsit_dec_conn_usage_count(conn);
4245 atomic_set(&conn->conn_logout_remove, 0);
4246 atomic_set(&sess->session_reinstatement, 0);
4247 atomic_set(&sess->session_fall_back_to_erl0, 1);
4250 spin_lock_bh(&sess->conn_lock);
4251 list_del(&conn->conn_list);
4254 * Attempt to let the Initiator know this connection failed by
4255 * sending an Connection Dropped Async Message on another
4256 * active connection.
4258 if (atomic_read(&conn->connection_recovery))
4259 iscsit_build_conn_drop_async_message(conn);
4261 spin_unlock_bh(&sess->conn_lock);
4264 * If connection reinstatement is being performed on this connection,
4265 * up the connection reinstatement semaphore that is being blocked on
4266 * in iscsit_cause_connection_reinstatement().
4268 spin_lock_bh(&conn->state_lock);
4269 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4270 spin_unlock_bh(&conn->state_lock);
4271 complete(&conn->conn_wait_comp);
4272 wait_for_completion(&conn->conn_post_wait_comp);
4273 spin_lock_bh(&conn->state_lock);
4277 * If connection reinstatement is being performed on this connection
4278 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4279 * connection wait rcfr semaphore that is being blocked on
4280 * an iscsit_connection_reinstatement_rcfr().
4282 if (atomic_read(&conn->connection_wait_rcfr)) {
4283 spin_unlock_bh(&conn->state_lock);
4284 complete(&conn->conn_wait_rcfr_comp);
4285 wait_for_completion(&conn->conn_post_wait_comp);
4286 spin_lock_bh(&conn->state_lock);
4288 atomic_set(&conn->connection_reinstatement, 1);
4289 spin_unlock_bh(&conn->state_lock);
4292 * If any other processes are accessing this connection pointer we
4293 * must wait until they have completed.
4295 iscsit_check_conn_usage_count(conn);
4297 if (conn->conn_rx_hash.tfm)
4298 crypto_free_hash(conn->conn_rx_hash.tfm);
4299 if (conn->conn_tx_hash.tfm)
4300 crypto_free_hash(conn->conn_tx_hash.tfm);
4302 if (conn->conn_cpumask)
4303 free_cpumask_var(conn->conn_cpumask);
4305 kfree(conn->conn_ops);
4306 conn->conn_ops = NULL;
4309 sock_release(conn->sock);
4311 if (conn->conn_transport->iscsit_free_conn)
4312 conn->conn_transport->iscsit_free_conn(conn);
4314 iscsit_put_transport(conn->conn_transport);
4316 conn->thread_set = NULL;
4318 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4319 conn->conn_state = TARG_CONN_STATE_FREE;
4322 spin_lock_bh(&sess->conn_lock);
4323 atomic_dec(&sess->nconn);
4324 pr_debug("Decremented iSCSI connection count to %hu from node:"
4325 " %s\n", atomic_read(&sess->nconn),
4326 sess->sess_ops->InitiatorName);
4328 * Make sure that if one connection fails in an non ERL=2 iSCSI
4329 * Session that they all fail.
4331 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4332 !atomic_read(&sess->session_logout))
4333 atomic_set(&sess->session_fall_back_to_erl0, 1);
4336 * If this was not the last connection in the session, and we are
4337 * performing session reinstatement or falling back to ERL=0, call
4338 * iscsit_stop_session() without sleeping to shutdown the other
4339 * active connections.
4341 if (atomic_read(&sess->nconn)) {
4342 if (!atomic_read(&sess->session_reinstatement) &&
4343 !atomic_read(&sess->session_fall_back_to_erl0)) {
4344 spin_unlock_bh(&sess->conn_lock);
4347 if (!atomic_read(&sess->session_stop_active)) {
4348 atomic_set(&sess->session_stop_active, 1);
4349 spin_unlock_bh(&sess->conn_lock);
4350 iscsit_stop_session(sess, 0, 0);
4353 spin_unlock_bh(&sess->conn_lock);
4358 * If this was the last connection in the session and one of the
4359 * following is occurring:
4361 * Session Reinstatement is not being performed, and are falling back
4362 * to ERL=0 call iscsit_close_session().
4364 * Session Logout was requested. iscsit_close_session() will be called
4367 * Session Continuation is not being performed, start the Time2Retain
4368 * handler and check if sleep_on_sess_wait_sem is active.
4370 if (!atomic_read(&sess->session_reinstatement) &&
4371 atomic_read(&sess->session_fall_back_to_erl0)) {
4372 spin_unlock_bh(&sess->conn_lock);
4373 target_put_session(sess->se_sess);
4376 } else if (atomic_read(&sess->session_logout)) {
4377 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4378 sess->session_state = TARG_SESS_STATE_FREE;
4379 spin_unlock_bh(&sess->conn_lock);
4381 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4382 complete(&sess->session_wait_comp);
4386 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4387 sess->session_state = TARG_SESS_STATE_FAILED;
4389 if (!atomic_read(&sess->session_continuation)) {
4390 spin_unlock_bh(&sess->conn_lock);
4391 iscsit_start_time2retain_handler(sess);
4393 spin_unlock_bh(&sess->conn_lock);
4395 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4396 complete(&sess->session_wait_comp);
4400 spin_unlock_bh(&sess->conn_lock);
4405 int iscsit_close_session(struct iscsi_session *sess)
4407 struct iscsi_portal_group *tpg = sess->tpg;
4408 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4410 if (atomic_read(&sess->nconn)) {
4411 pr_err("%d connection(s) still exist for iSCSI session"
4412 " to %s\n", atomic_read(&sess->nconn),
4413 sess->sess_ops->InitiatorName);
4417 spin_lock_bh(&se_tpg->session_lock);
4418 atomic_set(&sess->session_logout, 1);
4419 atomic_set(&sess->session_reinstatement, 1);
4420 iscsit_stop_time2retain_timer(sess);
4421 spin_unlock_bh(&se_tpg->session_lock);
4424 * transport_deregister_session_configfs() will clear the
4425 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4426 * can be setting it again with __transport_register_session() in
4427 * iscsi_post_login_handler() again after the iscsit_stop_session()
4428 * completes in iscsi_np context.
4430 transport_deregister_session_configfs(sess->se_sess);
4433 * If any other processes are accessing this session pointer we must
4434 * wait until they have completed. If we are in an interrupt (the
4435 * time2retain handler) and contain and active session usage count we
4436 * restart the timer and exit.
4438 if (!in_interrupt()) {
4439 if (iscsit_check_session_usage_count(sess) == 1)
4440 iscsit_stop_session(sess, 1, 1);
4442 if (iscsit_check_session_usage_count(sess) == 2) {
4443 atomic_set(&sess->session_logout, 0);
4444 iscsit_start_time2retain_handler(sess);
4449 transport_deregister_session(sess->se_sess);
4451 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4452 iscsit_free_connection_recovery_entires(sess);
4454 iscsit_free_all_ooo_cmdsns(sess);
4456 spin_lock_bh(&se_tpg->session_lock);
4457 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4458 sess->session_state = TARG_SESS_STATE_FREE;
4459 pr_debug("Released iSCSI session from node: %s\n",
4460 sess->sess_ops->InitiatorName);
4463 tpg->tpg_tiqn->tiqn_nsessions--;
4465 pr_debug("Decremented number of active iSCSI Sessions on"
4466 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4468 spin_lock(&sess_idr_lock);
4469 idr_remove(&sess_idr, sess->session_index);
4470 spin_unlock(&sess_idr_lock);
4472 kfree(sess->sess_ops);
4473 sess->sess_ops = NULL;
4474 spin_unlock_bh(&se_tpg->session_lock);
4480 static void iscsit_logout_post_handler_closesession(
4481 struct iscsi_conn *conn)
4483 struct iscsi_session *sess = conn->sess;
4485 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4486 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4488 atomic_set(&conn->conn_logout_remove, 0);
4489 complete(&conn->conn_logout_comp);
4491 iscsit_dec_conn_usage_count(conn);
4492 iscsit_stop_session(sess, 1, 1);
4493 iscsit_dec_session_usage_count(sess);
4494 target_put_session(sess->se_sess);
4497 static void iscsit_logout_post_handler_samecid(
4498 struct iscsi_conn *conn)
4500 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4501 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4503 atomic_set(&conn->conn_logout_remove, 0);
4504 complete(&conn->conn_logout_comp);
4506 iscsit_cause_connection_reinstatement(conn, 1);
4507 iscsit_dec_conn_usage_count(conn);
4510 static void iscsit_logout_post_handler_diffcid(
4511 struct iscsi_conn *conn,
4514 struct iscsi_conn *l_conn;
4515 struct iscsi_session *sess = conn->sess;
4520 spin_lock_bh(&sess->conn_lock);
4521 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4522 if (l_conn->cid == cid) {
4523 iscsit_inc_conn_usage_count(l_conn);
4527 spin_unlock_bh(&sess->conn_lock);
4533 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4535 spin_lock_bh(&l_conn->state_lock);
4536 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4537 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4538 spin_unlock_bh(&l_conn->state_lock);
4540 iscsit_cause_connection_reinstatement(l_conn, 1);
4541 iscsit_dec_conn_usage_count(l_conn);
4545 * Return of 0 causes the TX thread to restart.
4547 int iscsit_logout_post_handler(
4548 struct iscsi_cmd *cmd,
4549 struct iscsi_conn *conn)
4553 switch (cmd->logout_reason) {
4554 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4555 switch (cmd->logout_response) {
4556 case ISCSI_LOGOUT_SUCCESS:
4557 case ISCSI_LOGOUT_CLEANUP_FAILED:
4559 iscsit_logout_post_handler_closesession(conn);
4564 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4565 if (conn->cid == cmd->logout_cid) {
4566 switch (cmd->logout_response) {
4567 case ISCSI_LOGOUT_SUCCESS:
4568 case ISCSI_LOGOUT_CLEANUP_FAILED:
4570 iscsit_logout_post_handler_samecid(conn);
4575 switch (cmd->logout_response) {
4576 case ISCSI_LOGOUT_SUCCESS:
4577 iscsit_logout_post_handler_diffcid(conn,
4580 case ISCSI_LOGOUT_CID_NOT_FOUND:
4581 case ISCSI_LOGOUT_CLEANUP_FAILED:
4588 case ISCSI_LOGOUT_REASON_RECOVERY:
4589 switch (cmd->logout_response) {
4590 case ISCSI_LOGOUT_SUCCESS:
4591 case ISCSI_LOGOUT_CID_NOT_FOUND:
4592 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4593 case ISCSI_LOGOUT_CLEANUP_FAILED:
4605 EXPORT_SYMBOL(iscsit_logout_post_handler);
4607 void iscsit_fail_session(struct iscsi_session *sess)
4609 struct iscsi_conn *conn;
4611 spin_lock_bh(&sess->conn_lock);
4612 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4613 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4614 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4616 spin_unlock_bh(&sess->conn_lock);
4618 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4619 sess->session_state = TARG_SESS_STATE_FAILED;
4622 int iscsit_free_session(struct iscsi_session *sess)
4624 u16 conn_count = atomic_read(&sess->nconn);
4625 struct iscsi_conn *conn, *conn_tmp = NULL;
4628 spin_lock_bh(&sess->conn_lock);
4629 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4631 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4633 if (conn_count == 0)
4636 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4639 iscsit_inc_conn_usage_count(conn_tmp);
4642 iscsit_inc_conn_usage_count(conn);
4644 spin_unlock_bh(&sess->conn_lock);
4645 iscsit_cause_connection_reinstatement(conn, 1);
4646 spin_lock_bh(&sess->conn_lock);
4648 iscsit_dec_conn_usage_count(conn);
4650 iscsit_dec_conn_usage_count(conn_tmp);
4655 if (atomic_read(&sess->nconn)) {
4656 spin_unlock_bh(&sess->conn_lock);
4657 wait_for_completion(&sess->session_wait_comp);
4659 spin_unlock_bh(&sess->conn_lock);
4661 target_put_session(sess->se_sess);
4665 void iscsit_stop_session(
4666 struct iscsi_session *sess,
4668 int connection_sleep)
4670 u16 conn_count = atomic_read(&sess->nconn);
4671 struct iscsi_conn *conn, *conn_tmp = NULL;
4674 spin_lock_bh(&sess->conn_lock);
4676 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4678 if (connection_sleep) {
4679 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4681 if (conn_count == 0)
4684 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4687 iscsit_inc_conn_usage_count(conn_tmp);
4690 iscsit_inc_conn_usage_count(conn);
4692 spin_unlock_bh(&sess->conn_lock);
4693 iscsit_cause_connection_reinstatement(conn, 1);
4694 spin_lock_bh(&sess->conn_lock);
4696 iscsit_dec_conn_usage_count(conn);
4698 iscsit_dec_conn_usage_count(conn_tmp);
4702 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4703 iscsit_cause_connection_reinstatement(conn, 0);
4706 if (session_sleep && atomic_read(&sess->nconn)) {
4707 spin_unlock_bh(&sess->conn_lock);
4708 wait_for_completion(&sess->session_wait_comp);
4710 spin_unlock_bh(&sess->conn_lock);
4713 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4715 struct iscsi_session *sess;
4716 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4717 struct se_session *se_sess, *se_sess_tmp;
4718 int session_count = 0;
4720 spin_lock_bh(&se_tpg->session_lock);
4721 if (tpg->nsessions && !force) {
4722 spin_unlock_bh(&se_tpg->session_lock);
4726 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4728 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4730 spin_lock(&sess->conn_lock);
4731 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4732 atomic_read(&sess->session_logout) ||
4733 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4734 spin_unlock(&sess->conn_lock);
4737 atomic_set(&sess->session_reinstatement, 1);
4738 spin_unlock(&sess->conn_lock);
4739 spin_unlock_bh(&se_tpg->session_lock);
4741 iscsit_free_session(sess);
4742 spin_lock_bh(&se_tpg->session_lock);
4746 spin_unlock_bh(&se_tpg->session_lock);
4748 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4749 " Group: %hu\n", session_count, tpg->tpgt);
4753 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4754 MODULE_VERSION("4.1.x");
4755 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4756 MODULE_LICENSE("GPL");
4758 module_init(iscsi_target_init_module);
4759 module_exit(iscsi_target_cleanup_module);