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 <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <linux/inet.h>
31 #include <scsi/scsi_proto.h>
32 #include <scsi/iscsi_proto.h>
33 #include <scsi/scsi_tcq.h>
34 #include <target/target_core_base.h>
35 #include <target/target_core_fabric.h>
37 #include <target/iscsi/iscsi_target_core.h>
38 #include "iscsi_target_parameters.h"
39 #include "iscsi_target_seq_pdu_list.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include <target/iscsi/iscsi_target_stat.h>
52 #include <target/iscsi/iscsi_transport.h>
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_MUTEX(np_lock);
59 static struct idr tiqn_idr;
61 struct mutex auth_id_lock;
63 struct iscsit_global *iscsit_global;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75 struct iscsi_tiqn *tiqn = NULL;
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
88 spin_unlock(&tiqn->tiqn_state_lock);
91 spin_unlock(&tiqn_lock);
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
104 spin_unlock(&tiqn->tiqn_state_lock);
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122 struct iscsi_tiqn *tiqn = NULL;
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
128 return ERR_PTR(-EINVAL);
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
133 return ERR_PTR(-ENOMEM);
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160 spin_unlock(&tiqn_lock);
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172 * Wait for accesses to said struct iscsi_tiqn to end.
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
178 spin_lock(&tiqn->tiqn_state_lock);
180 spin_unlock(&tiqn->tiqn_state_lock);
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
196 iscsit_wait_for_tiqn(tiqn);
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
212 * Determine if the network portal is accepting storage traffic.
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
219 spin_unlock_bh(&np->np_thread_lock);
221 * Determine if the portal group is accepting storage traffic.
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
228 spin_unlock_bh(&tpg->tpg_state_lock);
231 * Here we serialize access across the TIQN+TPG Tuple.
233 ret = down_interruptible(&tpg->np_login_sem);
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
243 spin_unlock_bh(&tpg->tpg_state_lock);
248 void iscsit_login_kref_put(struct kref *kref)
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
253 complete(&tpg_np->tpg_np_comp);
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261 up(&tpg->np_login_sem);
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
267 iscsit_put_tiqn_for_login(tiqn);
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
275 int network_transport)
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->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);
301 port_e = ntohs(sock_in_e->sin_port);
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
311 static struct iscsi_np *iscsit_get_np(
312 struct sockaddr_storage *sockaddr,
313 int network_transport)
318 lockdep_assert_held(&np_lock);
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 sockaddr_storage *sockaddr,
346 int network_transport)
351 mutex_lock(&np_lock);
354 * Locate the existing struct iscsi_np if already active..
356 np = iscsit_get_np(sockaddr, network_transport);
358 mutex_unlock(&np_lock);
362 np = kzalloc(sizeof(*np), GFP_KERNEL);
364 mutex_unlock(&np_lock);
365 return ERR_PTR(-ENOMEM);
368 np->np_flags |= NPF_IP_NETWORK;
369 np->np_network_transport = network_transport;
370 spin_lock_init(&np->np_thread_lock);
371 init_completion(&np->np_restart_comp);
372 INIT_LIST_HEAD(&np->np_list);
374 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
376 ret = iscsi_target_setup_login_socket(np, sockaddr);
379 mutex_unlock(&np_lock);
383 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
384 if (IS_ERR(np->np_thread)) {
385 pr_err("Unable to create kthread: iscsi_np\n");
386 ret = PTR_ERR(np->np_thread);
388 mutex_unlock(&np_lock);
392 * Increment the np_exports reference count now to prevent
393 * iscsit_del_np() below from being run while a new call to
394 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
395 * active. We don't need to hold np->np_thread_lock at this
396 * point because iscsi_np has not been added to g_np_list yet.
399 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
401 list_add_tail(&np->np_list, &g_np_list);
402 mutex_unlock(&np_lock);
404 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
405 &np->np_sockaddr, np->np_transport->name);
410 int iscsit_reset_np_thread(
412 struct iscsi_tpg_np *tpg_np,
413 struct iscsi_portal_group *tpg,
416 spin_lock_bh(&np->np_thread_lock);
417 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
418 spin_unlock_bh(&np->np_thread_lock);
421 np->np_thread_state = ISCSI_NP_THREAD_RESET;
422 atomic_inc(&np->np_reset_count);
425 spin_unlock_bh(&np->np_thread_lock);
426 send_sig(SIGINT, np->np_thread, 1);
427 wait_for_completion(&np->np_restart_comp);
428 spin_lock_bh(&np->np_thread_lock);
430 spin_unlock_bh(&np->np_thread_lock);
432 if (tpg_np && shutdown) {
433 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
435 wait_for_completion(&tpg_np->tpg_np_comp);
441 static void iscsit_free_np(struct iscsi_np *np)
444 sock_release(np->np_socket);
447 int iscsit_del_np(struct iscsi_np *np)
449 spin_lock_bh(&np->np_thread_lock);
451 if (np->np_exports) {
453 spin_unlock_bh(&np->np_thread_lock);
456 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
457 spin_unlock_bh(&np->np_thread_lock);
461 * We need to send the signal to wakeup Linux/Net
462 * which may be sleeping in sock_accept()..
464 send_sig(SIGINT, np->np_thread, 1);
465 kthread_stop(np->np_thread);
466 np->np_thread = NULL;
469 np->np_transport->iscsit_free_np(np);
471 mutex_lock(&np_lock);
472 list_del(&np->np_list);
473 mutex_unlock(&np_lock);
475 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
476 &np->np_sockaddr, np->np_transport->name);
478 iscsit_put_transport(np->np_transport);
483 static void iscsit_get_rx_pdu(struct iscsi_conn *);
485 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
487 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
489 EXPORT_SYMBOL(iscsit_queue_rsp);
491 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
493 spin_lock_bh(&conn->cmd_lock);
494 if (!list_empty(&cmd->i_conn_node) &&
495 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
499 __iscsit_free_cmd(cmd, true);
501 EXPORT_SYMBOL(iscsit_aborted_task);
503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
504 u32, u32, const void *, void *);
505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
509 const void *data_buf, u32 data_buf_len)
511 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
516 iov = &cmd->iov_misc[0];
517 iov[niov].iov_base = cmd->pdu;
518 iov[niov++].iov_len = ISCSI_HDR_LEN;
520 if (conn->conn_ops->HeaderDigest) {
521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
524 ISCSI_HDR_LEN, 0, NULL,
527 iov[0].iov_len += ISCSI_CRC_LEN;
528 tx_size += ISCSI_CRC_LEN;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr->opcode, *header_digest);
535 u32 padding = ((-data_buf_len) & 3);
537 iov[niov].iov_base = (void *)data_buf;
538 iov[niov++].iov_len = data_buf_len;
539 tx_size += data_buf_len;
542 iov[niov].iov_base = &cmd->pad_bytes;
543 iov[niov++].iov_len = padding;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding);
549 if (conn->conn_ops->DataDigest) {
550 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
551 data_buf, data_buf_len,
552 padding, &cmd->pad_bytes,
555 iov[niov].iov_base = &cmd->data_crc;
556 iov[niov++].iov_len = ISCSI_CRC_LEN;
557 tx_size += ISCSI_CRC_LEN;
558 pr_debug("Attached DataDigest for %u"
559 " bytes opcode 0x%x, CRC 0x%08x\n",
560 data_buf_len, hdr->opcode, cmd->data_crc);
564 cmd->iov_misc_count = niov;
565 cmd->tx_size = tx_size;
567 ret = iscsit_send_tx_data(cmd, conn, 1);
569 iscsit_tx_thread_wait_for_tcp(conn);
576 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
577 u32 data_offset, u32 data_length);
578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
586 u32 iov_count = 0, tx_size = 0;
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
609 cmd->orig_iov_data_count - (iov_count + 2),
610 datain->offset, datain->length);
614 iov_count += iov_ret;
615 tx_size += datain->length;
617 cmd->padding = ((-datain->length) & 3);
619 iov[iov_count].iov_base = cmd->pad_bytes;
620 iov[iov_count++].iov_len = cmd->padding;
621 tx_size += cmd->padding;
623 pr_debug("Attaching %u padding bytes\n", cmd->padding);
626 if (conn->conn_ops->DataDigest) {
627 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
633 iov[iov_count].iov_base = &cmd->data_crc;
634 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
635 tx_size += ISCSI_CRC_LEN;
637 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
638 datain->length + cmd->padding, cmd->data_crc);
641 cmd->iov_data_count = iov_count;
642 cmd->tx_size = tx_size;
644 ret = iscsit_fe_sendpage_sg(cmd, conn);
646 iscsit_unmap_iovec(cmd);
649 iscsit_tx_thread_wait_for_tcp(conn);
656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
657 struct iscsi_datain_req *dr, const void *buf,
661 return iscsit_xmit_datain_pdu(conn, cmd, buf);
663 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
668 return TARGET_PROT_NORMAL;
671 static struct iscsit_transport iscsi_target_transport = {
673 .transport_type = ISCSI_TCP,
674 .rdma_shutdown = false,
676 .iscsit_setup_np = iscsit_setup_np,
677 .iscsit_accept_np = iscsit_accept_np,
678 .iscsit_free_np = iscsit_free_np,
679 .iscsit_get_login_rx = iscsit_get_login_rx,
680 .iscsit_put_login_tx = iscsit_put_login_tx,
681 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
682 .iscsit_immediate_queue = iscsit_immediate_queue,
683 .iscsit_response_queue = iscsit_response_queue,
684 .iscsit_queue_data_in = iscsit_queue_rsp,
685 .iscsit_queue_status = iscsit_queue_rsp,
686 .iscsit_aborted_task = iscsit_aborted_task,
687 .iscsit_xmit_pdu = iscsit_xmit_pdu,
688 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
689 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
692 static int __init iscsi_target_init_module(void)
696 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
697 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
701 spin_lock_init(&iscsit_global->ts_bitmap_lock);
702 mutex_init(&auth_id_lock);
705 ret = target_register_template(&iscsi_ops);
709 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
710 iscsit_global->ts_bitmap = vzalloc(size);
711 if (!iscsit_global->ts_bitmap)
714 lio_qr_cache = kmem_cache_create("lio_qr_cache",
715 sizeof(struct iscsi_queue_req),
716 __alignof__(struct iscsi_queue_req), 0, NULL);
718 pr_err("Unable to kmem_cache_create() for"
723 lio_dr_cache = kmem_cache_create("lio_dr_cache",
724 sizeof(struct iscsi_datain_req),
725 __alignof__(struct iscsi_datain_req), 0, NULL);
727 pr_err("Unable to kmem_cache_create() for"
732 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
733 sizeof(struct iscsi_ooo_cmdsn),
734 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
735 if (!lio_ooo_cache) {
736 pr_err("Unable to kmem_cache_create() for"
741 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
742 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
744 if (!lio_r2t_cache) {
745 pr_err("Unable to kmem_cache_create() for"
750 iscsit_register_transport(&iscsi_target_transport);
752 if (iscsit_load_discovery_tpg() < 0)
757 iscsit_unregister_transport(&iscsi_target_transport);
758 kmem_cache_destroy(lio_r2t_cache);
760 kmem_cache_destroy(lio_ooo_cache);
762 kmem_cache_destroy(lio_dr_cache);
764 kmem_cache_destroy(lio_qr_cache);
766 vfree(iscsit_global->ts_bitmap);
768 /* XXX: this probably wants it to be it's own unwind step.. */
769 if (iscsit_global->discovery_tpg)
770 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
771 target_unregister_template(&iscsi_ops);
773 kfree(iscsit_global);
777 static void __exit iscsi_target_cleanup_module(void)
779 iscsit_release_discovery_tpg();
780 iscsit_unregister_transport(&iscsi_target_transport);
781 kmem_cache_destroy(lio_qr_cache);
782 kmem_cache_destroy(lio_dr_cache);
783 kmem_cache_destroy(lio_ooo_cache);
784 kmem_cache_destroy(lio_r2t_cache);
787 * Shutdown discovery sessions and disable discovery TPG
789 if (iscsit_global->discovery_tpg)
790 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
792 target_unregister_template(&iscsi_ops);
794 vfree(iscsit_global->ts_bitmap);
795 kfree(iscsit_global);
798 int iscsit_add_reject(
799 struct iscsi_conn *conn,
803 struct iscsi_cmd *cmd;
805 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
809 cmd->iscsi_opcode = ISCSI_OP_REJECT;
810 cmd->reject_reason = reason;
812 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
814 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
815 iscsit_free_cmd(cmd, false);
819 spin_lock_bh(&conn->cmd_lock);
820 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
821 spin_unlock_bh(&conn->cmd_lock);
823 cmd->i_state = ISTATE_SEND_REJECT;
824 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
828 EXPORT_SYMBOL(iscsit_add_reject);
830 static int iscsit_add_reject_from_cmd(
831 struct iscsi_cmd *cmd,
836 struct iscsi_conn *conn;
837 const bool do_put = cmd->se_cmd.se_tfo != NULL;
840 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
846 cmd->iscsi_opcode = ISCSI_OP_REJECT;
847 cmd->reject_reason = reason;
849 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
851 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
852 iscsit_free_cmd(cmd, false);
857 spin_lock_bh(&conn->cmd_lock);
858 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
859 spin_unlock_bh(&conn->cmd_lock);
862 cmd->i_state = ISTATE_SEND_REJECT;
863 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
865 * Perform the kref_put now if se_cmd has already been setup by
866 * scsit_setup_scsi_cmd()
869 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
870 target_put_sess_cmd(&cmd->se_cmd);
875 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
878 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
881 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
883 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
885 EXPORT_SYMBOL(iscsit_reject_cmd);
888 * Map some portion of the allocated scatterlist to an iovec, suitable for
889 * kernel sockets to copy data in/out.
891 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
892 u32 data_offset, u32 data_length)
894 u32 i = 0, orig_data_length = data_length;
895 struct scatterlist *sg;
896 unsigned int page_off;
899 * We know each entry in t_data_sg contains a page.
901 u32 ent = data_offset / PAGE_SIZE;
906 if (ent >= cmd->se_cmd.t_data_nents) {
907 pr_err("Initial page entry out-of-bounds\n");
911 sg = &cmd->se_cmd.t_data_sg[ent];
912 page_off = (data_offset % PAGE_SIZE);
914 cmd->first_data_sg = sg;
915 cmd->first_data_sg_off = page_off;
917 while (data_length) {
920 if (WARN_ON_ONCE(!sg || i >= nvec))
923 cur_len = min_t(u32, data_length, sg->length - page_off);
925 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
926 iov[i].iov_len = cur_len;
928 data_length -= cur_len;
934 cmd->kmapped_nents = i;
939 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
940 data_offset, orig_data_length, i, nvec);
941 for_each_sg(cmd->se_cmd.t_data_sg, sg,
942 cmd->se_cmd.t_data_nents, i) {
943 pr_err("[%d] off %d len %d\n",
944 i, sg->offset, sg->length);
949 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
952 struct scatterlist *sg;
954 sg = cmd->first_data_sg;
956 for (i = 0; i < cmd->kmapped_nents; i++)
957 kunmap(sg_page(&sg[i]));
960 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
963 struct iscsi_cmd *cmd, *cmd_p;
965 conn->exp_statsn = exp_statsn;
967 if (conn->sess->sess_ops->RDMAExtensions)
970 spin_lock_bh(&conn->cmd_lock);
971 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
972 spin_lock(&cmd->istate_lock);
973 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
974 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
975 cmd->i_state = ISTATE_REMOVE;
976 spin_unlock(&cmd->istate_lock);
977 list_move_tail(&cmd->i_conn_node, &ack_list);
980 spin_unlock(&cmd->istate_lock);
982 spin_unlock_bh(&conn->cmd_lock);
984 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
985 list_del_init(&cmd->i_conn_node);
986 iscsit_free_cmd(cmd, false);
990 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
992 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
994 iov_count += ISCSI_IOV_DATA_BUFFER;
995 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
999 cmd->orig_iov_data_count = iov_count;
1003 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1006 int data_direction, payload_length;
1007 struct iscsi_scsi_req *hdr;
1008 int iscsi_task_attr;
1011 atomic_long_inc(&conn->sess->cmd_pdus);
1013 hdr = (struct iscsi_scsi_req *) buf;
1014 payload_length = ntoh24(hdr->dlength);
1016 /* FIXME; Add checks for AdditionalHeaderSegment */
1018 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1019 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1020 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1021 " not set. Bad iSCSI Initiator.\n");
1022 return iscsit_add_reject_cmd(cmd,
1023 ISCSI_REASON_BOOKMARK_INVALID, buf);
1026 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1027 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1029 * From RFC-3720 Section 10.3.1:
1031 * "Either or both of R and W MAY be 1 when either the
1032 * Expected Data Transfer Length and/or Bidirectional Read
1033 * Expected Data Transfer Length are 0"
1035 * For this case, go ahead and clear the unnecssary bits
1036 * to avoid any confusion with ->data_direction.
1038 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1039 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1041 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1042 " set when Expected Data Transfer Length is 0 for"
1043 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1046 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1047 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1048 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1049 " MUST be set if Expected Data Transfer Length is not 0."
1050 " Bad iSCSI Initiator\n");
1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
1055 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1056 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1057 pr_err("Bidirectional operations not supported!\n");
1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_BOOKMARK_INVALID, buf);
1062 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1063 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1064 " Scsi Command PDU.\n");
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_BOOKMARK_INVALID, buf);
1069 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1070 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1071 " protocol error.\n", payload_length);
1072 return iscsit_add_reject_cmd(cmd,
1073 ISCSI_REASON_PROTOCOL_ERROR, buf);
1076 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1077 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1078 pr_err("Expected Data Transfer Length and Length of"
1079 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1080 " bit is not set protocol error\n");
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1085 if (payload_length > be32_to_cpu(hdr->data_length)) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " EDTL: %u, protocol error.\n", payload_length,
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_PROTOCOL_ERROR, buf);
1093 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1094 pr_err("DataSegmentLength: %u is greater than"
1095 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1096 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1097 return iscsit_add_reject_cmd(cmd,
1098 ISCSI_REASON_PROTOCOL_ERROR, buf);
1101 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1102 pr_err("DataSegmentLength: %u is greater than"
1103 " FirstBurstLength: %u, protocol error.\n",
1104 payload_length, conn->sess->sess_ops->FirstBurstLength);
1105 return iscsit_add_reject_cmd(cmd,
1106 ISCSI_REASON_BOOKMARK_INVALID, buf);
1109 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1110 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1113 cmd->data_direction = data_direction;
1114 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1116 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1118 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1119 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1120 sam_task_attr = TCM_SIMPLE_TAG;
1121 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1122 sam_task_attr = TCM_ORDERED_TAG;
1123 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1124 sam_task_attr = TCM_HEAD_TAG;
1125 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1126 sam_task_attr = TCM_ACA_TAG;
1128 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1129 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1130 sam_task_attr = TCM_SIMPLE_TAG;
1133 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1134 cmd->i_state = ISTATE_NEW_CMD;
1135 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1136 cmd->immediate_data = (payload_length) ? 1 : 0;
1137 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1138 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1139 if (cmd->unsolicited_data)
1140 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1142 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1143 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1144 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1146 cmd->targ_xfer_tag = 0xFFFFFFFF;
1147 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1148 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1149 cmd->first_burst_len = payload_length;
1151 if (!conn->sess->sess_ops->RDMAExtensions &&
1152 cmd->data_direction == DMA_FROM_DEVICE) {
1153 struct iscsi_datain_req *dr;
1155 dr = iscsit_allocate_datain_req();
1157 return iscsit_add_reject_cmd(cmd,
1158 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1160 iscsit_attach_datain_req(cmd, dr);
1164 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1166 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1167 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1168 cmd->data_direction, sam_task_attr,
1169 cmd->sense_buffer + 2);
1171 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1172 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1173 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1176 target_get_sess_cmd(&cmd->se_cmd, true);
1178 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1179 scsilun_to_int(&hdr->lun));
1180 if (cmd->sense_reason)
1183 /* only used for printks or comparing with ->ref_task_tag */
1184 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1185 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1186 if (cmd->sense_reason) {
1187 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1188 return iscsit_add_reject_cmd(cmd,
1189 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1195 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1196 return iscsit_add_reject_cmd(cmd,
1197 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1201 spin_lock_bh(&conn->cmd_lock);
1202 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1203 spin_unlock_bh(&conn->cmd_lock);
1205 * Check if we need to delay processing because of ALUA
1206 * Active/NonOptimized primary access state..
1208 core_alua_check_nonop_delay(&cmd->se_cmd);
1212 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1214 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1216 iscsit_set_dataout_sequence_values(cmd);
1218 spin_lock_bh(&cmd->dataout_timeout_lock);
1219 iscsit_start_dataout_timer(cmd, cmd->conn);
1220 spin_unlock_bh(&cmd->dataout_timeout_lock);
1222 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1224 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1225 struct iscsi_scsi_req *hdr)
1229 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1230 * the Immediate Bit is not set, and no Immediate
1233 * A PDU/CmdSN carrying Immediate Data can only
1234 * be processed after the DataCRC has passed.
1235 * If the DataCRC fails, the CmdSN MUST NOT
1236 * be acknowledged. (See below)
1238 if (!cmd->immediate_data) {
1239 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1240 (unsigned char *)hdr, hdr->cmdsn);
1241 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1243 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1244 target_put_sess_cmd(&cmd->se_cmd);
1249 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1252 * If no Immediate Data is attached, it's OK to return now.
1254 if (!cmd->immediate_data) {
1255 if (!cmd->sense_reason && cmd->unsolicited_data)
1256 iscsit_set_unsolicited_dataout(cmd);
1257 if (!cmd->sense_reason)
1260 target_put_sess_cmd(&cmd->se_cmd);
1265 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1266 * execution. These exceptions are processed in CmdSN order using
1267 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1269 if (cmd->sense_reason)
1272 * Call directly into transport_generic_new_cmd() to perform
1273 * the backend memory allocation.
1275 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1276 if (cmd->sense_reason)
1281 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1284 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1287 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1291 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1294 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1295 cmd->first_burst_len);
1297 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1298 cmd->se_cmd.data_length, cmd->write_data_done,
1299 cmd->first_burst_len, length);
1300 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1301 pr_debug("Finished dumping immediate data\n");
1303 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1305 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1306 cmd->first_burst_len);
1309 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1311 * A PDU/CmdSN carrying Immediate Data passed
1312 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1313 * Immediate Bit is not set.
1315 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1316 (unsigned char *)hdr, hdr->cmdsn);
1317 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1320 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1321 target_put_sess_cmd(&cmd->se_cmd);
1324 } else if (cmd->unsolicited_data)
1325 iscsit_set_unsolicited_dataout(cmd);
1327 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1329 * Immediate Data failed DataCRC and ERL>=1,
1330 * silently drop this PDU and let the initiator
1331 * plug the CmdSN gap.
1333 * FIXME: Send Unsolicited NOPIN with reserved
1334 * TTT here to help the initiator figure out
1335 * the missing CmdSN, although they should be
1336 * intelligent enough to determine the missing
1337 * CmdSN and issue a retry to plug the sequence.
1339 cmd->i_state = ISTATE_REMOVE;
1340 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1341 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1348 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1351 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1353 bool dump_payload = false;
1355 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1359 * Allocation iovecs needed for struct socket operations for
1360 * traditional iSCSI block I/O.
1362 if (iscsit_allocate_iovecs(cmd) < 0) {
1363 return iscsit_reject_cmd(cmd,
1364 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1366 immed_data = cmd->immediate_data;
1368 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1372 dump_payload = true;
1377 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1380 static u32 iscsit_do_crypto_hash_sg(
1381 struct ahash_request *hash,
1382 struct iscsi_cmd *cmd,
1389 struct scatterlist *sg;
1390 unsigned int page_off;
1392 crypto_ahash_init(hash);
1394 sg = cmd->first_data_sg;
1395 page_off = cmd->first_data_sg_off;
1397 while (data_length) {
1398 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1400 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1401 crypto_ahash_update(hash);
1403 data_length -= cur_len;
1405 /* iscsit_map_iovec has already checked for invalid sg pointers */
1410 struct scatterlist pad_sg;
1412 sg_init_one(&pad_sg, pad_bytes, padding);
1413 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1415 crypto_ahash_finup(hash);
1417 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1418 crypto_ahash_final(hash);
1424 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1425 const void *buf, u32 payload_length, u32 padding,
1426 const void *pad_bytes, void *data_crc)
1428 struct scatterlist sg[2];
1430 sg_init_table(sg, ARRAY_SIZE(sg));
1431 sg_set_buf(sg, buf, payload_length);
1433 sg_set_buf(sg + 1, pad_bytes, padding);
1435 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1437 crypto_ahash_digest(hash);
1441 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1442 struct iscsi_cmd *cmd, u32 payload_length,
1445 struct iscsi_data *hdr = buf;
1446 struct se_cmd *se_cmd;
1450 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1452 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1453 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1454 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1455 payload_length, conn->cid);
1457 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1458 pr_err("Command ITT: 0x%08x received DataOUT after"
1459 " last DataOUT received, dumping payload\n",
1460 cmd->init_task_tag);
1461 return iscsit_dump_data_payload(conn, payload_length, 1);
1464 if (cmd->data_direction != DMA_TO_DEVICE) {
1465 pr_err("Command ITT: 0x%08x received DataOUT for a"
1466 " NON-WRITE command.\n", cmd->init_task_tag);
1467 return iscsit_dump_data_payload(conn, payload_length, 1);
1469 se_cmd = &cmd->se_cmd;
1470 iscsit_mod_dataout_timer(cmd);
1472 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1473 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1474 be32_to_cpu(hdr->offset), payload_length,
1475 cmd->se_cmd.data_length);
1476 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1479 if (cmd->unsolicited_data) {
1480 int dump_unsolicited_data = 0;
1482 if (conn->sess->sess_ops->InitialR2T) {
1483 pr_err("Received unexpected unsolicited data"
1484 " while InitialR2T=Yes, protocol error.\n");
1485 transport_send_check_condition_and_sense(&cmd->se_cmd,
1486 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1490 * Special case for dealing with Unsolicited DataOUT
1491 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1495 /* Something's amiss if we're not in WRITE_PENDING state... */
1496 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1497 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1498 dump_unsolicited_data = 1;
1500 if (dump_unsolicited_data) {
1502 * Check if a delayed TASK_ABORTED status needs to
1503 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1504 * received with the unsolicited data out.
1506 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1507 iscsit_stop_dataout_timer(cmd);
1509 return iscsit_dump_data_payload(conn, payload_length, 1);
1513 * For the normal solicited data path:
1515 * Check for a delayed TASK_ABORTED status and dump any
1516 * incoming data out payload if one exists. Also, when the
1517 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1518 * data out sequence, we decrement outstanding_r2ts. Once
1519 * outstanding_r2ts reaches zero, go ahead and send the delayed
1520 * TASK_ABORTED status.
1522 if (se_cmd->transport_state & CMD_T_ABORTED) {
1523 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1524 --cmd->outstanding_r2ts < 1)
1525 iscsit_stop_dataout_timer(cmd);
1527 return iscsit_dump_data_payload(conn, payload_length, 1);
1531 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1532 * within-command recovery checks before receiving the payload.
1534 rc = iscsit_check_pre_dataout(cmd, buf);
1535 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1537 else if (rc == DATAOUT_CANNOT_RECOVER)
1542 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1545 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1546 struct iscsi_cmd **out_cmd)
1548 struct iscsi_data *hdr = buf;
1549 struct iscsi_cmd *cmd;
1550 u32 payload_length = ntoh24(hdr->dlength);
1552 bool success = false;
1554 if (!payload_length) {
1555 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1559 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1560 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1561 " MaxXmitDataSegmentLength: %u\n", payload_length,
1562 conn->conn_ops->MaxXmitDataSegmentLength);
1563 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1566 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1570 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1577 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1580 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1581 struct iscsi_data *hdr)
1584 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1586 int iov_ret, data_crc_failed = 0;
1588 payload_length = min_t(u32, cmd->se_cmd.data_length,
1589 ntoh24(hdr->dlength));
1590 rx_size += payload_length;
1591 iov = &cmd->iov_data[0];
1593 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1594 be32_to_cpu(hdr->offset), payload_length);
1598 iov_count += iov_ret;
1600 padding = ((-payload_length) & 3);
1602 iov[iov_count].iov_base = cmd->pad_bytes;
1603 iov[iov_count++].iov_len = padding;
1605 pr_debug("Receiving %u padding bytes.\n", padding);
1608 if (conn->conn_ops->DataDigest) {
1609 iov[iov_count].iov_base = &checksum;
1610 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1611 rx_size += ISCSI_CRC_LEN;
1614 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1615 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1617 iscsit_unmap_iovec(cmd);
1619 if (rx_got != rx_size)
1622 if (conn->conn_ops->DataDigest) {
1625 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1626 be32_to_cpu(hdr->offset),
1627 payload_length, padding,
1630 if (checksum != data_crc) {
1631 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1632 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1633 " does not match computed 0x%08x\n",
1634 hdr->itt, hdr->offset, payload_length,
1635 hdr->datasn, checksum, data_crc);
1636 data_crc_failed = 1;
1638 pr_debug("Got CRC32C DataDigest 0x%08x for"
1639 " %u bytes of Data Out\n", checksum,
1644 return data_crc_failed;
1648 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1649 bool data_crc_failed)
1651 struct iscsi_conn *conn = cmd->conn;
1654 * Increment post receive data and CRC values or perform
1655 * within-command recovery.
1657 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1658 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1660 else if (rc == DATAOUT_SEND_R2T) {
1661 iscsit_set_dataout_sequence_values(cmd);
1662 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1663 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1665 * Handle extra special case for out of order
1666 * Unsolicited Data Out.
1668 spin_lock_bh(&cmd->istate_lock);
1669 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1670 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1671 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1672 spin_unlock_bh(&cmd->istate_lock);
1674 iscsit_stop_dataout_timer(cmd);
1677 target_execute_cmd(&cmd->se_cmd);
1679 } else /* DATAOUT_CANNOT_RECOVER */
1684 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1686 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1688 struct iscsi_cmd *cmd = NULL;
1689 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1691 bool data_crc_failed = false;
1693 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1699 rc = iscsit_get_dataout(conn, cmd, hdr);
1703 data_crc_failed = true;
1705 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1708 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1709 struct iscsi_nopout *hdr)
1711 u32 payload_length = ntoh24(hdr->dlength);
1713 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1714 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1716 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1717 (unsigned char *)hdr);
1719 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1720 (unsigned char *)hdr);
1723 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1724 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1725 " not set, protocol error.\n");
1727 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1728 (unsigned char *)hdr);
1730 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1731 (unsigned char *)hdr);
1734 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1735 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1736 " greater than MaxXmitDataSegmentLength: %u, protocol"
1737 " error.\n", payload_length,
1738 conn->conn_ops->MaxXmitDataSegmentLength);
1740 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1741 (unsigned char *)hdr);
1743 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1744 (unsigned char *)hdr);
1747 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1748 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1749 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1750 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1753 * This is not a response to a Unsolicited NopIN, which means
1754 * it can either be a NOPOUT ping request (with a valid ITT),
1755 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1756 * Either way, make sure we allocate an struct iscsi_cmd, as both
1757 * can contain ping data.
1759 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1760 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1761 cmd->i_state = ISTATE_SEND_NOPIN;
1762 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1764 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1765 cmd->targ_xfer_tag = 0xFFFFFFFF;
1766 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1767 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1768 cmd->data_direction = DMA_NONE;
1773 EXPORT_SYMBOL(iscsit_setup_nop_out);
1775 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1776 struct iscsi_nopout *hdr)
1778 struct iscsi_cmd *cmd_p = NULL;
1781 * Initiator is expecting a NopIN ping reply..
1783 if (hdr->itt != RESERVED_ITT) {
1785 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1786 (unsigned char *)hdr);
1788 spin_lock_bh(&conn->cmd_lock);
1789 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1790 spin_unlock_bh(&conn->cmd_lock);
1792 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1794 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1795 iscsit_add_cmd_to_response_queue(cmd, conn,
1800 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1801 (unsigned char *)hdr, hdr->cmdsn);
1802 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1804 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1810 * This was a response to a unsolicited NOPIN ping.
1812 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1813 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1817 iscsit_stop_nopin_response_timer(conn);
1819 cmd_p->i_state = ISTATE_REMOVE;
1820 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1822 iscsit_start_nopin_timer(conn);
1826 * Otherwise, initiator is not expecting a NOPIN is response.
1827 * Just ignore for now.
1831 iscsit_free_cmd(cmd, false);
1835 EXPORT_SYMBOL(iscsit_process_nop_out);
1837 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1840 unsigned char *ping_data = NULL;
1841 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1842 struct kvec *iov = NULL;
1843 u32 payload_length = ntoh24(hdr->dlength);
1846 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1850 * Handle NOP-OUT payload for traditional iSCSI sockets
1852 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1853 u32 checksum, data_crc, padding = 0;
1854 int niov = 0, rx_got, rx_size = payload_length;
1856 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1862 iov = &cmd->iov_misc[0];
1863 iov[niov].iov_base = ping_data;
1864 iov[niov++].iov_len = payload_length;
1866 padding = ((-payload_length) & 3);
1868 pr_debug("Receiving %u additional bytes"
1869 " for padding.\n", padding);
1870 iov[niov].iov_base = &cmd->pad_bytes;
1871 iov[niov++].iov_len = padding;
1874 if (conn->conn_ops->DataDigest) {
1875 iov[niov].iov_base = &checksum;
1876 iov[niov++].iov_len = ISCSI_CRC_LEN;
1877 rx_size += ISCSI_CRC_LEN;
1880 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1881 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1882 if (rx_got != rx_size) {
1887 if (conn->conn_ops->DataDigest) {
1888 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1889 payload_length, padding,
1890 cmd->pad_bytes, &data_crc);
1892 if (checksum != data_crc) {
1893 pr_err("Ping data CRC32C DataDigest"
1894 " 0x%08x does not match computed 0x%08x\n",
1895 checksum, data_crc);
1896 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1897 pr_err("Unable to recover from"
1898 " NOPOUT Ping DataCRC failure while in"
1904 * Silently drop this PDU and let the
1905 * initiator plug the CmdSN gap.
1907 pr_debug("Dropping NOPOUT"
1908 " Command CmdSN: 0x%08x due to"
1909 " DataCRC error.\n", hdr->cmdsn);
1914 pr_debug("Got CRC32C DataDigest"
1915 " 0x%08x for %u bytes of ping data.\n",
1916 checksum, payload_length);
1920 ping_data[payload_length] = '\0';
1922 * Attach ping data to struct iscsi_cmd->buf_ptr.
1924 cmd->buf_ptr = ping_data;
1925 cmd->buf_ptr_size = payload_length;
1927 pr_debug("Got %u bytes of NOPOUT ping"
1928 " data.\n", payload_length);
1929 pr_debug("Ping Data: \"%s\"\n", ping_data);
1932 return iscsit_process_nop_out(conn, cmd, hdr);
1935 iscsit_free_cmd(cmd, false);
1941 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1943 switch (iscsi_tmf) {
1944 case ISCSI_TM_FUNC_ABORT_TASK:
1945 return TMR_ABORT_TASK;
1946 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1947 return TMR_ABORT_TASK_SET;
1948 case ISCSI_TM_FUNC_CLEAR_ACA:
1949 return TMR_CLEAR_ACA;
1950 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1951 return TMR_CLEAR_TASK_SET;
1952 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1953 return TMR_LUN_RESET;
1954 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1955 return TMR_TARGET_WARM_RESET;
1956 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1957 return TMR_TARGET_COLD_RESET;
1964 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967 struct se_tmr_req *se_tmr;
1968 struct iscsi_tmr_req *tmr_req;
1969 struct iscsi_tm *hdr;
1970 int out_of_order_cmdsn = 0, ret;
1971 u8 function, tcm_function = TMR_UNKNOWN;
1973 hdr = (struct iscsi_tm *) buf;
1974 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1975 function = hdr->flags;
1977 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1978 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1979 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1980 hdr->rtt, hdr->refcmdsn, conn->cid);
1982 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1983 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1984 hdr->rtt != RESERVED_ITT)) {
1985 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1986 hdr->rtt = RESERVED_ITT;
1989 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1990 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1991 pr_err("Task Management Request TASK_REASSIGN not"
1992 " issued as immediate command, bad iSCSI Initiator"
1993 "implementation\n");
1994 return iscsit_add_reject_cmd(cmd,
1995 ISCSI_REASON_PROTOCOL_ERROR, buf);
1997 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1998 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1999 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2001 cmd->data_direction = DMA_NONE;
2002 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2003 if (!cmd->tmr_req) {
2004 return iscsit_add_reject_cmd(cmd,
2005 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2009 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2010 conn->sess->se_sess, 0, DMA_NONE,
2011 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2013 target_get_sess_cmd(&cmd->se_cmd, true);
2016 * TASK_REASSIGN for ERL=2 / connection stays inside of
2017 * LIO-Target $FABRIC_MOD
2019 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2020 tcm_function = iscsit_convert_tmf(function);
2021 if (tcm_function == TMR_UNKNOWN) {
2022 pr_err("Unknown iSCSI TMR Function:"
2023 " 0x%02x\n", function);
2024 return iscsit_add_reject_cmd(cmd,
2025 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2028 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2031 return iscsit_add_reject_cmd(cmd,
2032 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2034 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2036 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2037 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2038 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2039 cmd->init_task_tag = hdr->itt;
2040 cmd->targ_xfer_tag = 0xFFFFFFFF;
2041 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2042 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2043 se_tmr = cmd->se_cmd.se_tmr_req;
2044 tmr_req = cmd->tmr_req;
2046 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2048 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2049 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2050 scsilun_to_int(&hdr->lun));
2052 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2058 case ISCSI_TM_FUNC_ABORT_TASK:
2059 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2060 if (se_tmr->response)
2063 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2064 case ISCSI_TM_FUNC_CLEAR_ACA:
2065 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2066 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2068 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2069 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2070 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2074 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2075 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2076 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2080 case ISCSI_TM_FUNC_TASK_REASSIGN:
2081 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2083 * Perform sanity checks on the ExpDataSN only if the
2084 * TASK_REASSIGN was successful.
2086 if (se_tmr->response)
2089 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2090 return iscsit_add_reject_cmd(cmd,
2091 ISCSI_REASON_BOOKMARK_INVALID, buf);
2094 pr_err("Unknown TMR function: 0x%02x, protocol"
2095 " error.\n", function);
2096 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2100 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2101 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2102 se_tmr->call_transport = 1;
2104 spin_lock_bh(&conn->cmd_lock);
2105 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2106 spin_unlock_bh(&conn->cmd_lock);
2108 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2109 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2110 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2111 out_of_order_cmdsn = 1;
2112 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2113 target_put_sess_cmd(&cmd->se_cmd);
2115 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2119 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2121 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2124 * Found the referenced task, send to transport for processing.
2126 if (se_tmr->call_transport)
2127 return transport_generic_handle_tmr(&cmd->se_cmd);
2130 * Could not find the referenced LUN, task, or Task Management
2131 * command not authorized or supported. Change state and
2132 * let the tx_thread send the response.
2134 * For connection recovery, this is also the default action for
2135 * TMR TASK_REASSIGN.
2137 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2138 target_put_sess_cmd(&cmd->se_cmd);
2141 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2143 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2145 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2146 struct iscsi_text *hdr)
2148 u32 payload_length = ntoh24(hdr->dlength);
2150 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2151 pr_err("Unable to accept text parameter length: %u"
2152 "greater than MaxXmitDataSegmentLength %u.\n",
2153 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2154 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2155 (unsigned char *)hdr);
2158 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2159 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2160 pr_err("Multi sequence text commands currently not supported\n");
2161 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2162 (unsigned char *)hdr);
2165 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2166 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2167 hdr->exp_statsn, payload_length);
2169 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2170 cmd->i_state = ISTATE_SEND_TEXTRSP;
2171 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2172 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2173 cmd->targ_xfer_tag = 0xFFFFFFFF;
2174 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2175 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2176 cmd->data_direction = DMA_NONE;
2177 kfree(cmd->text_in_ptr);
2178 cmd->text_in_ptr = NULL;
2182 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2185 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2186 struct iscsi_text *hdr)
2188 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2192 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2193 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2194 pr_err("Unable to locate text_in buffer for sendtargets"
2198 goto empty_sendtargets;
2200 if (strncmp("SendTargets", text_in, 11) != 0) {
2201 pr_err("Received Text Data that is not"
2202 " SendTargets, cannot continue.\n");
2205 text_ptr = strchr(text_in, '=');
2207 pr_err("No \"=\" separator found in Text Data,"
2208 " cannot continue.\n");
2211 if (!strncmp("=All", text_ptr, 4)) {
2212 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2213 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2214 !strncmp("=eui.", text_ptr, 5)) {
2215 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2217 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2221 spin_lock_bh(&conn->cmd_lock);
2222 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2223 spin_unlock_bh(&conn->cmd_lock);
2226 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2228 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2229 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2230 (unsigned char *)hdr, hdr->cmdsn);
2231 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2237 return iscsit_execute_cmd(cmd, 0);
2240 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2241 (unsigned char *)hdr);
2243 EXPORT_SYMBOL(iscsit_process_text_cmd);
2246 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2249 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2250 char *text_in = NULL;
2251 u32 payload_length = ntoh24(hdr->dlength);
2254 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2258 rx_size = payload_length;
2259 if (payload_length) {
2260 u32 checksum = 0, data_crc = 0;
2262 int niov = 0, rx_got;
2265 rx_size = ALIGN(payload_length, 4);
2266 text_in = kzalloc(rx_size, GFP_KERNEL);
2270 cmd->text_in_ptr = text_in;
2272 memset(iov, 0, sizeof(iov));
2273 iov[niov].iov_base = text_in;
2274 iov[niov++].iov_len = rx_size;
2276 padding = rx_size - payload_length;
2278 pr_debug("Receiving %u additional bytes"
2279 " for padding.\n", padding);
2280 if (conn->conn_ops->DataDigest) {
2281 iov[niov].iov_base = &checksum;
2282 iov[niov++].iov_len = ISCSI_CRC_LEN;
2283 rx_size += ISCSI_CRC_LEN;
2286 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2287 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2288 if (rx_got != rx_size)
2291 if (conn->conn_ops->DataDigest) {
2292 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2293 text_in, rx_size, 0, NULL,
2296 if (checksum != data_crc) {
2297 pr_err("Text data CRC32C DataDigest"
2298 " 0x%08x does not match computed"
2299 " 0x%08x\n", checksum, data_crc);
2300 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2301 pr_err("Unable to recover from"
2302 " Text Data digest failure while in"
2307 * Silently drop this PDU and let the
2308 * initiator plug the CmdSN gap.
2310 pr_debug("Dropping Text"
2311 " Command CmdSN: 0x%08x due to"
2312 " DataCRC error.\n", hdr->cmdsn);
2317 pr_debug("Got CRC32C DataDigest"
2318 " 0x%08x for %u bytes of text data.\n",
2319 checksum, payload_length);
2322 text_in[payload_length - 1] = '\0';
2323 pr_debug("Successfully read %d bytes of text"
2324 " data.\n", payload_length);
2327 return iscsit_process_text_cmd(conn, cmd, hdr);
2330 kfree(cmd->text_in_ptr);
2331 cmd->text_in_ptr = NULL;
2332 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2335 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2337 struct iscsi_conn *conn_p;
2338 struct iscsi_session *sess = conn->sess;
2340 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2341 " for SID: %u.\n", conn->cid, conn->sess->sid);
2343 atomic_set(&sess->session_logout, 1);
2344 atomic_set(&conn->conn_logout_remove, 1);
2345 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2347 iscsit_inc_conn_usage_count(conn);
2348 iscsit_inc_session_usage_count(sess);
2350 spin_lock_bh(&sess->conn_lock);
2351 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2352 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2355 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2356 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2358 spin_unlock_bh(&sess->conn_lock);
2360 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2365 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2367 struct iscsi_conn *l_conn;
2368 struct iscsi_session *sess = conn->sess;
2370 pr_debug("Received logout request CLOSECONNECTION for CID:"
2371 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2374 * A Logout Request with a CLOSECONNECTION reason code for a CID
2375 * can arrive on a connection with a differing CID.
2377 if (conn->cid == cmd->logout_cid) {
2378 spin_lock_bh(&conn->state_lock);
2379 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2380 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2382 atomic_set(&conn->conn_logout_remove, 1);
2383 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2384 iscsit_inc_conn_usage_count(conn);
2386 spin_unlock_bh(&conn->state_lock);
2389 * Handle all different cid CLOSECONNECTION requests in
2390 * iscsit_logout_post_handler_diffcid() as to give enough
2391 * time for any non immediate command's CmdSN to be
2392 * acknowledged on the connection in question.
2394 * Here we simply make sure the CID is still around.
2396 l_conn = iscsit_get_conn_from_cid(sess,
2399 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2400 iscsit_add_cmd_to_response_queue(cmd, conn,
2405 iscsit_dec_conn_usage_count(l_conn);
2408 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2413 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2415 struct iscsi_session *sess = conn->sess;
2417 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2418 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2420 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2421 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2422 " while ERL!=2.\n");
2423 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2424 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2428 if (conn->cid == cmd->logout_cid) {
2429 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2430 " with CID: %hu on CID: %hu, implementation error.\n",
2431 cmd->logout_cid, conn->cid);
2432 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2433 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2437 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2443 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2446 int cmdsn_ret, logout_remove = 0;
2448 struct iscsi_logout *hdr;
2449 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2451 hdr = (struct iscsi_logout *) buf;
2452 reason_code = (hdr->flags & 0x7f);
2455 spin_lock(&tiqn->logout_stats.lock);
2456 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2457 tiqn->logout_stats.normal_logouts++;
2459 tiqn->logout_stats.abnormal_logouts++;
2460 spin_unlock(&tiqn->logout_stats.lock);
2463 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2464 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2465 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2466 hdr->cid, conn->cid);
2468 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2469 pr_err("Received logout request on connection that"
2470 " is not in logged in state, ignoring request.\n");
2471 iscsit_free_cmd(cmd, false);
2475 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2476 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2477 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2478 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2479 cmd->targ_xfer_tag = 0xFFFFFFFF;
2480 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2481 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2482 cmd->logout_cid = be16_to_cpu(hdr->cid);
2483 cmd->logout_reason = reason_code;
2484 cmd->data_direction = DMA_NONE;
2487 * We need to sleep in these cases (by returning 1) until the Logout
2488 * Response gets sent in the tx thread.
2490 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2491 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2492 be16_to_cpu(hdr->cid) == conn->cid))
2495 spin_lock_bh(&conn->cmd_lock);
2496 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2497 spin_unlock_bh(&conn->cmd_lock);
2499 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2500 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2503 * Immediate commands are executed, well, immediately.
2504 * Non-Immediate Logout Commands are executed in CmdSN order.
2506 if (cmd->immediate_cmd) {
2507 int ret = iscsit_execute_cmd(cmd, 0);
2512 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2513 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2515 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2519 return logout_remove;
2521 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2523 int iscsit_handle_snack(
2524 struct iscsi_conn *conn,
2527 struct iscsi_snack *hdr;
2529 hdr = (struct iscsi_snack *) buf;
2530 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2532 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2533 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2534 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2535 hdr->begrun, hdr->runlength, conn->cid);
2537 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2538 pr_err("Initiator sent SNACK request while in"
2539 " ErrorRecoveryLevel=0.\n");
2540 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2544 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2545 * call from inside iscsi_send_recovery_datain_or_r2t().
2547 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2549 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2551 be32_to_cpu(hdr->ttt),
2552 be32_to_cpu(hdr->begrun),
2553 be32_to_cpu(hdr->runlength));
2554 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2555 return iscsit_handle_status_snack(conn, hdr->itt,
2556 be32_to_cpu(hdr->ttt),
2557 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2558 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2559 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2560 be32_to_cpu(hdr->begrun),
2561 be32_to_cpu(hdr->runlength));
2562 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2563 /* FIXME: Support R-Data SNACK */
2564 pr_err("R-Data SNACK Not Supported.\n");
2565 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2568 pr_err("Unknown SNACK type 0x%02x, protocol"
2569 " error.\n", hdr->flags & 0x0f);
2570 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2576 EXPORT_SYMBOL(iscsit_handle_snack);
2578 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2580 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2581 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2582 wait_for_completion_interruptible_timeout(
2583 &conn->rx_half_close_comp,
2584 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2588 static int iscsit_handle_immediate_data(
2589 struct iscsi_cmd *cmd,
2590 struct iscsi_scsi_req *hdr,
2593 int iov_ret, rx_got = 0, rx_size = 0;
2594 u32 checksum, iov_count = 0, padding = 0;
2595 struct iscsi_conn *conn = cmd->conn;
2597 void *overflow_buf = NULL;
2599 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2600 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2601 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2602 cmd->orig_iov_data_count - 2,
2603 cmd->write_data_done, rx_size);
2605 return IMMEDIATE_DATA_CANNOT_RECOVER;
2607 iov_count = iov_ret;
2608 iov = &cmd->iov_data[0];
2609 if (rx_size < length) {
2611 * Special case: length of immediate data exceeds the data
2612 * buffer size derived from the CDB.
2614 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2615 if (!overflow_buf) {
2616 iscsit_unmap_iovec(cmd);
2617 return IMMEDIATE_DATA_CANNOT_RECOVER;
2619 cmd->overflow_buf = overflow_buf;
2620 iov[iov_count].iov_base = overflow_buf;
2621 iov[iov_count].iov_len = length - rx_size;
2626 padding = ((-length) & 3);
2628 iov[iov_count].iov_base = cmd->pad_bytes;
2629 iov[iov_count++].iov_len = padding;
2633 if (conn->conn_ops->DataDigest) {
2634 iov[iov_count].iov_base = &checksum;
2635 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2636 rx_size += ISCSI_CRC_LEN;
2639 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2640 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2642 iscsit_unmap_iovec(cmd);
2644 if (rx_got != rx_size) {
2645 iscsit_rx_thread_wait_for_tcp(conn);
2646 return IMMEDIATE_DATA_CANNOT_RECOVER;
2649 if (conn->conn_ops->DataDigest) {
2652 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2653 cmd->write_data_done, length, padding,
2656 if (checksum != data_crc) {
2657 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2658 " does not match computed 0x%08x\n", checksum,
2661 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2662 pr_err("Unable to recover from"
2663 " Immediate Data digest failure while"
2665 iscsit_reject_cmd(cmd,
2666 ISCSI_REASON_DATA_DIGEST_ERROR,
2667 (unsigned char *)hdr);
2668 return IMMEDIATE_DATA_CANNOT_RECOVER;
2670 iscsit_reject_cmd(cmd,
2671 ISCSI_REASON_DATA_DIGEST_ERROR,
2672 (unsigned char *)hdr);
2673 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2676 pr_debug("Got CRC32C DataDigest 0x%08x for"
2677 " %u bytes of Immediate Data\n", checksum,
2682 cmd->write_data_done += length;
2684 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2685 spin_lock_bh(&cmd->istate_lock);
2686 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2687 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2688 spin_unlock_bh(&cmd->istate_lock);
2691 return IMMEDIATE_DATA_NORMAL_OPERATION;
2694 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2695 with active network interface */
2696 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2698 struct iscsi_cmd *cmd;
2699 struct iscsi_conn *conn_p;
2702 lockdep_assert_held(&conn->sess->conn_lock);
2705 * Only send a Asynchronous Message on connections whos network
2706 * interface is still functional.
2708 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2709 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2710 iscsit_inc_conn_usage_count(conn_p);
2719 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2721 iscsit_dec_conn_usage_count(conn_p);
2725 cmd->logout_cid = conn->cid;
2726 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2727 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2729 spin_lock_bh(&conn_p->cmd_lock);
2730 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2731 spin_unlock_bh(&conn_p->cmd_lock);
2733 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2734 iscsit_dec_conn_usage_count(conn_p);
2737 static int iscsit_send_conn_drop_async_message(
2738 struct iscsi_cmd *cmd,
2739 struct iscsi_conn *conn)
2741 struct iscsi_async *hdr;
2743 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2745 hdr = (struct iscsi_async *) cmd->pdu;
2746 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2747 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2748 cmd->init_task_tag = RESERVED_ITT;
2749 cmd->targ_xfer_tag = 0xFFFFFFFF;
2750 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2751 cmd->stat_sn = conn->stat_sn++;
2752 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2753 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2754 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2755 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2756 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2757 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2758 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2760 pr_debug("Sending Connection Dropped Async Message StatSN:"
2761 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2762 cmd->logout_cid, conn->cid);
2764 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2767 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2769 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2770 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2771 wait_for_completion_interruptible_timeout(
2772 &conn->tx_half_close_comp,
2773 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2778 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2779 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2782 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2783 hdr->flags = datain->flags;
2784 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2785 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2786 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2787 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2788 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2789 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2790 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2793 hton24(hdr->dlength, datain->length);
2794 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2795 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2796 (struct scsi_lun *)&hdr->lun);
2798 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2800 hdr->itt = cmd->init_task_tag;
2802 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2803 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2805 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2807 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2809 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2811 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2812 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2813 hdr->datasn = cpu_to_be32(datain->data_sn);
2814 hdr->offset = cpu_to_be32(datain->offset);
2816 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2817 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2818 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2819 ntohl(hdr->offset), datain->length, conn->cid);
2821 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2823 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2825 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2826 struct iscsi_datain datain;
2827 struct iscsi_datain_req *dr;
2829 bool set_statsn = false;
2831 memset(&datain, 0, sizeof(struct iscsi_datain));
2832 dr = iscsit_get_datain_values(cmd, &datain);
2834 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2835 cmd->init_task_tag);
2839 * Be paranoid and double check the logic for now.
2841 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2842 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2843 " datain.length: %u exceeds cmd->data_length: %u\n",
2844 cmd->init_task_tag, datain.offset, datain.length,
2845 cmd->se_cmd.data_length);
2849 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2851 * Special case for successfully execution w/ both DATAIN
2854 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2855 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2856 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2858 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2859 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2860 iscsit_increment_maxcmdsn(cmd, conn->sess);
2861 cmd->stat_sn = conn->stat_sn++;
2863 } else if (dr->dr_complete ==
2864 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2868 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2870 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2874 if (dr->dr_complete) {
2875 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2877 iscsit_free_datain_req(cmd, dr);
2884 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2885 struct iscsi_logout_rsp *hdr)
2887 struct iscsi_conn *logout_conn = NULL;
2888 struct iscsi_conn_recovery *cr = NULL;
2889 struct iscsi_session *sess = conn->sess;
2891 * The actual shutting down of Sessions and/or Connections
2892 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2893 * is done in scsi_logout_post_handler().
2895 switch (cmd->logout_reason) {
2896 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2897 pr_debug("iSCSI session logout successful, setting"
2898 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2899 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2901 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2902 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2905 * For CLOSECONNECTION logout requests carrying
2906 * a matching logout CID -> local CID, the reference
2907 * for the local CID will have been incremented in
2908 * iscsi_logout_closeconnection().
2910 * For CLOSECONNECTION logout requests carrying
2911 * a different CID than the connection it arrived
2912 * on, the connection responding to cmd->logout_cid
2913 * is stopped in iscsit_logout_post_handler_diffcid().
2916 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2917 " successful.\n", cmd->logout_cid, conn->cid);
2918 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2920 case ISCSI_LOGOUT_REASON_RECOVERY:
2921 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2922 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2925 * If the connection is still active from our point of view
2926 * force connection recovery to occur.
2928 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2931 iscsit_connection_reinstatement_rcfr(logout_conn);
2932 iscsit_dec_conn_usage_count(logout_conn);
2935 cr = iscsit_get_inactive_connection_recovery_entry(
2936 conn->sess, cmd->logout_cid);
2938 pr_err("Unable to locate CID: %hu for"
2939 " REMOVECONNFORRECOVERY Logout Request.\n",
2941 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2945 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2947 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2948 " for recovery for CID: %hu on CID: %hu successful.\n",
2949 cmd->logout_cid, conn->cid);
2950 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2953 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2954 cmd->logout_reason);
2958 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2959 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2960 hdr->response = cmd->logout_response;
2961 hdr->itt = cmd->init_task_tag;
2962 cmd->stat_sn = conn->stat_sn++;
2963 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2965 iscsit_increment_maxcmdsn(cmd, conn->sess);
2966 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2967 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2969 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2970 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2971 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2972 cmd->logout_cid, conn->cid);
2976 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2979 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2983 rc = iscsit_build_logout_rsp(cmd, conn,
2984 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2988 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2992 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2993 struct iscsi_nopin *hdr, bool nopout_response)
2995 hdr->opcode = ISCSI_OP_NOOP_IN;
2996 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2997 hton24(hdr->dlength, cmd->buf_ptr_size);
2998 if (nopout_response)
2999 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3000 hdr->itt = cmd->init_task_tag;
3001 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3002 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3004 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3006 if (nopout_response)
3007 iscsit_increment_maxcmdsn(cmd, conn->sess);
3009 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3010 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3012 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3013 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3014 "Solicited" : "Unsolicited", cmd->init_task_tag,
3015 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3017 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3020 * Unsolicited NOPIN, either requesting a response or not.
3022 static int iscsit_send_unsolicited_nopin(
3023 struct iscsi_cmd *cmd,
3024 struct iscsi_conn *conn,
3027 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3030 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3032 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3033 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3035 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3039 spin_lock_bh(&cmd->istate_lock);
3040 cmd->i_state = want_response ?
3041 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3042 spin_unlock_bh(&cmd->istate_lock);
3048 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3050 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3052 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3055 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3056 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3058 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3060 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3065 static int iscsit_send_r2t(
3066 struct iscsi_cmd *cmd,
3067 struct iscsi_conn *conn)
3069 struct iscsi_r2t *r2t;
3070 struct iscsi_r2t_rsp *hdr;
3073 r2t = iscsit_get_r2t_from_list(cmd);
3077 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3078 memset(hdr, 0, ISCSI_HDR_LEN);
3079 hdr->opcode = ISCSI_OP_R2T;
3080 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3081 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3082 (struct scsi_lun *)&hdr->lun);
3083 hdr->itt = cmd->init_task_tag;
3084 if (conn->conn_transport->iscsit_get_r2t_ttt)
3085 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3087 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3088 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3089 hdr->statsn = cpu_to_be32(conn->stat_sn);
3090 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3091 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3092 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3093 hdr->data_offset = cpu_to_be32(r2t->offset);
3094 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3096 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3097 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3098 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3099 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3100 r2t->offset, r2t->xfer_len, conn->cid);
3102 spin_lock_bh(&cmd->r2t_lock);
3104 spin_unlock_bh(&cmd->r2t_lock);
3106 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3111 spin_lock_bh(&cmd->dataout_timeout_lock);
3112 iscsit_start_dataout_timer(cmd, conn);
3113 spin_unlock_bh(&cmd->dataout_timeout_lock);
3119 * @recovery: If called from iscsi_task_reassign_complete_write() for
3120 * connection recovery.
3122 int iscsit_build_r2ts_for_cmd(
3123 struct iscsi_conn *conn,
3124 struct iscsi_cmd *cmd,
3128 u32 offset = 0, xfer_len = 0;
3130 spin_lock_bh(&cmd->r2t_lock);
3131 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3132 spin_unlock_bh(&cmd->r2t_lock);
3136 if (conn->sess->sess_ops->DataSequenceInOrder &&
3138 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3140 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3141 if (conn->sess->sess_ops->DataSequenceInOrder) {
3142 offset = cmd->r2t_offset;
3144 if (first_r2t && recovery) {
3145 int new_data_end = offset +
3146 conn->sess->sess_ops->MaxBurstLength -
3147 cmd->next_burst_len;
3149 if (new_data_end > cmd->se_cmd.data_length)
3150 xfer_len = cmd->se_cmd.data_length - offset;
3153 conn->sess->sess_ops->MaxBurstLength -
3154 cmd->next_burst_len;
3156 int new_data_end = offset +
3157 conn->sess->sess_ops->MaxBurstLength;
3159 if (new_data_end > cmd->se_cmd.data_length)
3160 xfer_len = cmd->se_cmd.data_length - offset;
3162 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3165 if ((s32)xfer_len < 0) {
3166 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3170 cmd->r2t_offset += xfer_len;
3172 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3173 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3175 struct iscsi_seq *seq;
3177 seq = iscsit_get_seq_holder_for_r2t(cmd);
3179 spin_unlock_bh(&cmd->r2t_lock);
3183 offset = seq->offset;
3184 xfer_len = seq->xfer_len;
3186 if (cmd->seq_send_order == cmd->seq_count)
3187 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3189 cmd->outstanding_r2ts++;
3192 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3193 spin_unlock_bh(&cmd->r2t_lock);
3197 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3200 spin_unlock_bh(&cmd->r2t_lock);
3204 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3206 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3207 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3210 cmd->stat_sn = conn->stat_sn++;
3212 atomic_long_inc(&conn->sess->rsp_pdus);
3214 memset(hdr, 0, ISCSI_HDR_LEN);
3215 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3216 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3217 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3218 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3219 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3220 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3221 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3222 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3224 hdr->response = cmd->iscsi_response;
3225 hdr->cmd_status = cmd->se_cmd.scsi_status;
3226 hdr->itt = cmd->init_task_tag;
3227 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3229 iscsit_increment_maxcmdsn(cmd, conn->sess);
3230 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3231 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3233 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3234 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3235 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3236 cmd->se_cmd.scsi_status, conn->cid);
3238 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3240 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3242 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3243 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3244 void *data_buf = NULL;
3245 u32 padding = 0, data_buf_len = 0;
3247 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3250 * Attach SENSE DATA payload to iSCSI Response PDU
3252 if (cmd->se_cmd.sense_buffer &&
3253 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3254 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3255 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3256 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3258 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3259 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3260 data_buf = cmd->sense_buffer;
3261 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3264 memset(cmd->sense_buffer +
3265 cmd->se_cmd.scsi_sense_length, 0, padding);
3266 pr_debug("Adding %u bytes of padding to"
3267 " SENSE.\n", padding);
3270 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3272 cmd->se_cmd.scsi_sense_length);
3275 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3279 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3281 switch (se_tmr->response) {
3282 case TMR_FUNCTION_COMPLETE:
3283 return ISCSI_TMF_RSP_COMPLETE;
3284 case TMR_TASK_DOES_NOT_EXIST:
3285 return ISCSI_TMF_RSP_NO_TASK;
3286 case TMR_LUN_DOES_NOT_EXIST:
3287 return ISCSI_TMF_RSP_NO_LUN;
3288 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3289 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3290 case TMR_FUNCTION_REJECTED:
3292 return ISCSI_TMF_RSP_REJECTED;
3297 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3298 struct iscsi_tm_rsp *hdr)
3300 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3302 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3303 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3304 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3305 hdr->itt = cmd->init_task_tag;
3306 cmd->stat_sn = conn->stat_sn++;
3307 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3309 iscsit_increment_maxcmdsn(cmd, conn->sess);
3310 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3311 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3313 pr_debug("Built Task Management Response ITT: 0x%08x,"
3314 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3315 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3317 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3320 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3322 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3324 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3326 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3329 #define SENDTARGETS_BUF_LIMIT 32768U
3332 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3333 enum iscsit_transport_type network_transport,
3334 int skip_bytes, bool *completed)
3336 char *payload = NULL;
3337 struct iscsi_conn *conn = cmd->conn;
3338 struct iscsi_portal_group *tpg;
3339 struct iscsi_tiqn *tiqn;
3340 struct iscsi_tpg_np *tpg_np;
3341 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3342 int target_name_printed;
3343 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3344 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3347 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3348 SENDTARGETS_BUF_LIMIT);
3350 payload = kzalloc(buffer_len, GFP_KERNEL);
3355 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3358 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3359 text_ptr = strchr(text_in, '=');
3361 pr_err("Unable to locate '=' string in text_in:"
3367 * Skip over '=' character..
3372 spin_lock(&tiqn_lock);
3373 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3374 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3375 strcmp(tiqn->tiqn, text_ptr)) {
3379 target_name_printed = 0;
3381 spin_lock(&tiqn->tiqn_tpg_lock);
3382 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3384 /* If demo_mode_discovery=0 and generate_node_acls=0
3385 * (demo mode dislabed) do not return
3386 * TargetName+TargetAddress unless a NodeACL exists.
3389 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3390 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3391 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3392 cmd->conn->sess->sess_ops->InitiatorName))) {
3396 spin_lock(&tpg->tpg_state_lock);
3397 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3398 spin_unlock(&tpg->tpg_state_lock);
3400 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3403 spin_lock(&tpg->tpg_np_lock);
3404 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3406 struct iscsi_np *np = tpg_np->tpg_np;
3407 struct sockaddr_storage *sockaddr;
3409 if (np->np_network_transport != network_transport)
3412 if (!target_name_printed) {
3413 len = sprintf(buf, "TargetName=%s",
3417 if ((len + payload_len) > buffer_len) {
3418 spin_unlock(&tpg->tpg_np_lock);
3419 spin_unlock(&tiqn->tiqn_tpg_lock);
3424 if (skip_bytes && len <= skip_bytes) {
3427 memcpy(payload + payload_len, buf, len);
3429 target_name_printed = 1;
3430 if (len > skip_bytes)
3435 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3436 sockaddr = &conn->local_sockaddr;
3438 sockaddr = &np->np_sockaddr;
3440 len = sprintf(buf, "TargetAddress="
3446 if ((len + payload_len) > buffer_len) {
3447 spin_unlock(&tpg->tpg_np_lock);
3448 spin_unlock(&tiqn->tiqn_tpg_lock);
3453 if (skip_bytes && len <= skip_bytes) {
3456 memcpy(payload + payload_len, buf, len);
3458 if (len > skip_bytes)
3462 spin_unlock(&tpg->tpg_np_lock);
3464 spin_unlock(&tiqn->tiqn_tpg_lock);
3471 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3474 spin_unlock(&tiqn_lock);
3476 cmd->buf_ptr = payload;
3482 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3483 struct iscsi_text_rsp *hdr,
3484 enum iscsit_transport_type network_transport)
3486 int text_length, padding;
3487 bool completed = true;
3489 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3490 cmd->read_data_done,
3492 if (text_length < 0)
3496 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3498 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3499 cmd->read_data_done += text_length;
3500 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3501 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3503 hdr->opcode = ISCSI_OP_TEXT_RSP;
3504 padding = ((-text_length) & 3);
3505 hton24(hdr->dlength, text_length);
3506 hdr->itt = cmd->init_task_tag;
3507 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3508 cmd->stat_sn = conn->stat_sn++;
3509 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3511 iscsit_increment_maxcmdsn(cmd, conn->sess);
3513 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3514 * correctly increment MaxCmdSN for each response answering a
3515 * non immediate text request with a valid CmdSN.
3517 cmd->maxcmdsn_inc = 0;
3518 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3519 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3521 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3522 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3523 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3524 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3525 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3527 return text_length + padding;
3529 EXPORT_SYMBOL(iscsit_build_text_rsp);
3531 static int iscsit_send_text_rsp(
3532 struct iscsi_cmd *cmd,
3533 struct iscsi_conn *conn)
3535 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3538 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3539 conn->conn_transport->transport_type);
3540 if (text_length < 0)
3543 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3549 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3550 struct iscsi_reject *hdr)
3552 hdr->opcode = ISCSI_OP_REJECT;
3553 hdr->reason = cmd->reject_reason;
3554 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3555 hton24(hdr->dlength, ISCSI_HDR_LEN);
3556 hdr->ffffffff = cpu_to_be32(0xffffffff);
3557 cmd->stat_sn = conn->stat_sn++;
3558 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3559 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3560 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3563 EXPORT_SYMBOL(iscsit_build_reject);
3565 static int iscsit_send_reject(
3566 struct iscsi_cmd *cmd,
3567 struct iscsi_conn *conn)
3569 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3571 iscsit_build_reject(cmd, conn, hdr);
3573 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3574 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3576 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3581 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3585 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3586 * within iscsit_start_kthreads()
3588 * Here we use bitmap_id to determine which CPU that this
3589 * iSCSI connection's RX/TX threads will be scheduled to
3592 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3593 for_each_online_cpu(cpu) {
3595 cpumask_set_cpu(cpu, conn->conn_cpumask);
3600 * This should never be reached..
3603 cpumask_setall(conn->conn_cpumask);
3607 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3612 case ISTATE_SEND_R2T:
3613 ret = iscsit_send_r2t(cmd, conn);
3618 spin_lock_bh(&conn->cmd_lock);
3619 list_del_init(&cmd->i_conn_node);
3620 spin_unlock_bh(&conn->cmd_lock);
3622 iscsit_free_cmd(cmd, false);
3624 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3625 iscsit_mod_nopin_response_timer(conn);
3626 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3630 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3631 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3636 pr_err("Unknown Opcode: 0x%02x ITT:"
3637 " 0x%08x, i_state: %d on CID: %hu\n",
3638 cmd->iscsi_opcode, cmd->init_task_tag, state,
3648 EXPORT_SYMBOL(iscsit_immediate_queue);
3651 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3653 struct iscsit_transport *t = conn->conn_transport;
3654 struct iscsi_queue_req *qr;
3655 struct iscsi_cmd *cmd;
3659 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3660 atomic_set(&conn->check_immediate_queue, 0);
3663 kmem_cache_free(lio_qr_cache, qr);
3665 ret = t->iscsit_immediate_queue(conn, cmd, state);
3674 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3680 case ISTATE_SEND_DATAIN:
3681 ret = iscsit_send_datain(cmd, conn);
3686 goto check_rsp_state;
3687 else if (ret == 1) {
3689 spin_lock_bh(&cmd->istate_lock);
3690 cmd->i_state = ISTATE_SENT_STATUS;
3691 spin_unlock_bh(&cmd->istate_lock);
3693 if (atomic_read(&conn->check_immediate_queue))
3697 } else if (ret == 2) {
3698 /* Still must send status,
3699 SCF_TRANSPORT_TASK_SENSE was set */
3700 spin_lock_bh(&cmd->istate_lock);
3701 cmd->i_state = ISTATE_SEND_STATUS;
3702 spin_unlock_bh(&cmd->istate_lock);
3703 state = ISTATE_SEND_STATUS;
3704 goto check_rsp_state;
3708 case ISTATE_SEND_STATUS:
3709 case ISTATE_SEND_STATUS_RECOVERY:
3710 ret = iscsit_send_response(cmd, conn);
3712 case ISTATE_SEND_LOGOUTRSP:
3713 ret = iscsit_send_logout(cmd, conn);
3715 case ISTATE_SEND_ASYNCMSG:
3716 ret = iscsit_send_conn_drop_async_message(
3719 case ISTATE_SEND_NOPIN:
3720 ret = iscsit_send_nopin(cmd, conn);
3722 case ISTATE_SEND_REJECT:
3723 ret = iscsit_send_reject(cmd, conn);
3725 case ISTATE_SEND_TASKMGTRSP:
3726 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3729 ret = iscsit_tmr_post_handler(cmd, conn);
3731 iscsit_fall_back_to_erl0(conn->sess);
3733 case ISTATE_SEND_TEXTRSP:
3734 ret = iscsit_send_text_rsp(cmd, conn);
3737 pr_err("Unknown Opcode: 0x%02x ITT:"
3738 " 0x%08x, i_state: %d on CID: %hu\n",
3739 cmd->iscsi_opcode, cmd->init_task_tag,
3747 case ISTATE_SEND_LOGOUTRSP:
3748 if (!iscsit_logout_post_handler(cmd, conn))
3751 case ISTATE_SEND_STATUS:
3752 case ISTATE_SEND_ASYNCMSG:
3753 case ISTATE_SEND_NOPIN:
3754 case ISTATE_SEND_STATUS_RECOVERY:
3755 case ISTATE_SEND_TEXTRSP:
3756 case ISTATE_SEND_TASKMGTRSP:
3757 case ISTATE_SEND_REJECT:
3758 spin_lock_bh(&cmd->istate_lock);
3759 cmd->i_state = ISTATE_SENT_STATUS;
3760 spin_unlock_bh(&cmd->istate_lock);
3763 pr_err("Unknown Opcode: 0x%02x ITT:"
3764 " 0x%08x, i_state: %d on CID: %hu\n",
3765 cmd->iscsi_opcode, cmd->init_task_tag,
3766 cmd->i_state, conn->cid);
3770 if (atomic_read(&conn->check_immediate_queue))
3778 EXPORT_SYMBOL(iscsit_response_queue);
3780 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3782 struct iscsit_transport *t = conn->conn_transport;
3783 struct iscsi_queue_req *qr;
3784 struct iscsi_cmd *cmd;
3788 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3791 kmem_cache_free(lio_qr_cache, qr);
3793 ret = t->iscsit_response_queue(conn, cmd, state);
3794 if (ret == 1 || ret < 0)
3801 int iscsi_target_tx_thread(void *arg)
3804 struct iscsi_conn *conn = arg;
3805 bool conn_freed = false;
3808 * Allow ourselves to be interrupted by SIGINT so that a
3809 * connection recovery / failure event can be triggered externally.
3811 allow_signal(SIGINT);
3813 while (!kthread_should_stop()) {
3815 * Ensure that both TX and RX per connection kthreads
3816 * are scheduled to run on the same CPU.
3818 iscsit_thread_check_cpumask(conn, current, 1);
3820 wait_event_interruptible(conn->queues_wq,
3821 !iscsit_conn_all_queues_empty(conn));
3823 if (signal_pending(current))
3827 ret = iscsit_handle_immediate_queue(conn);
3831 ret = iscsit_handle_response_queue(conn);
3834 } else if (ret == -ECONNRESET) {
3837 } else if (ret < 0) {
3844 * Avoid the normal connection failure code-path if this connection
3845 * is still within LOGIN mode, and iscsi_np process context is
3846 * responsible for cleaning up the early connection failure.
3848 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3849 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3852 while (!kthread_should_stop()) {
3859 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3861 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3862 struct iscsi_cmd *cmd;
3865 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3866 case ISCSI_OP_SCSI_CMD:
3867 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3871 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3873 case ISCSI_OP_SCSI_DATA_OUT:
3874 ret = iscsit_handle_data_out(conn, buf);
3876 case ISCSI_OP_NOOP_OUT:
3878 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3879 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3883 ret = iscsit_handle_nop_out(conn, cmd, buf);
3885 case ISCSI_OP_SCSI_TMFUNC:
3886 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3890 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3893 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3894 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3898 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3903 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3905 case ISCSI_OP_LOGOUT:
3906 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3910 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3912 wait_for_completion_timeout(&conn->conn_logout_comp,
3913 SECONDS_FOR_LOGOUT_COMP * HZ);
3915 case ISCSI_OP_SNACK:
3916 ret = iscsit_handle_snack(conn, buf);
3919 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3920 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3921 pr_err("Cannot recover from unknown"
3922 " opcode while ERL=0, closing iSCSI connection.\n");
3925 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3926 " closing iSCSI connection.\n");
3933 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3936 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3940 spin_lock_bh(&conn->state_lock);
3941 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3942 spin_unlock_bh(&conn->state_lock);
3947 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3951 u32 checksum = 0, digest = 0;
3954 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3958 while (!kthread_should_stop()) {
3960 * Ensure that both TX and RX per connection kthreads
3961 * are scheduled to run on the same CPU.
3963 iscsit_thread_check_cpumask(conn, current, 0);
3965 memset(&iov, 0, sizeof(struct kvec));
3967 iov.iov_base = buffer;
3968 iov.iov_len = ISCSI_HDR_LEN;
3970 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3971 if (ret != ISCSI_HDR_LEN) {
3972 iscsit_rx_thread_wait_for_tcp(conn);
3976 if (conn->conn_ops->HeaderDigest) {
3977 iov.iov_base = &digest;
3978 iov.iov_len = ISCSI_CRC_LEN;
3980 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3981 if (ret != ISCSI_CRC_LEN) {
3982 iscsit_rx_thread_wait_for_tcp(conn);
3986 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3987 ISCSI_HDR_LEN, 0, NULL,
3990 if (digest != checksum) {
3991 pr_err("HeaderDigest CRC32C failed,"
3992 " received 0x%08x, computed 0x%08x\n",
3995 * Set the PDU to 0xff so it will intentionally
3996 * hit default in the switch below.
3998 memset(buffer, 0xff, ISCSI_HDR_LEN);
3999 atomic_long_inc(&conn->sess->conn_digest_errors);
4001 pr_debug("Got HeaderDigest CRC32C"
4002 " 0x%08x\n", checksum);
4006 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4009 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4011 if (conn->sess->sess_ops->SessionType &&
4012 ((!(opcode & ISCSI_OP_TEXT)) ||
4013 (!(opcode & ISCSI_OP_LOGOUT)))) {
4014 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4015 " while in Discovery Session, rejecting.\n", opcode);
4016 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4021 ret = iscsi_target_rx_opcode(conn, buffer);
4029 int iscsi_target_rx_thread(void *arg)
4032 struct iscsi_conn *conn = arg;
4033 bool conn_freed = false;
4036 * Allow ourselves to be interrupted by SIGINT so that a
4037 * connection recovery / failure event can be triggered externally.
4039 allow_signal(SIGINT);
4041 * Wait for iscsi_post_login_handler() to complete before allowing
4042 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4044 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4045 if (rc < 0 || iscsi_target_check_conn_state(conn))
4048 if (!conn->conn_transport->iscsit_get_rx_pdu)
4051 conn->conn_transport->iscsit_get_rx_pdu(conn);
4053 if (!signal_pending(current))
4054 atomic_set(&conn->transport_failed, 1);
4055 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4059 while (!kthread_should_stop()) {
4067 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4069 LIST_HEAD(tmp_list);
4070 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4071 struct iscsi_session *sess = conn->sess;
4073 * We expect this function to only ever be called from either RX or TX
4074 * thread context via iscsit_close_connection() once the other context
4075 * has been reset -> returned sleeping pre-handler state.
4077 spin_lock_bh(&conn->cmd_lock);
4078 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4080 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4081 struct se_cmd *se_cmd = &cmd->se_cmd;
4083 if (se_cmd->se_tfo != NULL) {
4084 spin_lock_irq(&se_cmd->t_state_lock);
4085 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4086 spin_unlock_irq(&se_cmd->t_state_lock);
4089 spin_unlock_bh(&conn->cmd_lock);
4091 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4092 list_del_init(&cmd->i_conn_node);
4094 iscsit_increment_maxcmdsn(cmd, sess);
4095 iscsit_free_cmd(cmd, true);
4100 static void iscsit_stop_timers_for_cmds(
4101 struct iscsi_conn *conn)
4103 struct iscsi_cmd *cmd;
4105 spin_lock_bh(&conn->cmd_lock);
4106 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4107 if (cmd->data_direction == DMA_TO_DEVICE)
4108 iscsit_stop_dataout_timer(cmd);
4110 spin_unlock_bh(&conn->cmd_lock);
4113 int iscsit_close_connection(
4114 struct iscsi_conn *conn)
4116 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4117 struct iscsi_session *sess = conn->sess;
4119 pr_debug("Closing iSCSI connection CID %hu on SID:"
4120 " %u\n", conn->cid, sess->sid);
4122 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4123 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4124 * sleeping and the logout response never got sent because the
4125 * connection failed.
4127 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4128 * to signal logout response TX interrupt completion. Go ahead and skip
4129 * this for iser since isert_rx_opcode() does not wait on logout failure,
4130 * and to avoid iscsi_conn pointer dereference in iser-target code.
4132 if (!conn->conn_transport->rdma_shutdown)
4133 complete(&conn->conn_logout_comp);
4135 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4136 if (conn->tx_thread &&
4137 cmpxchg(&conn->tx_thread_active, true, false)) {
4138 send_sig(SIGINT, conn->tx_thread, 1);
4139 kthread_stop(conn->tx_thread);
4141 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4142 if (conn->rx_thread &&
4143 cmpxchg(&conn->rx_thread_active, true, false)) {
4144 send_sig(SIGINT, conn->rx_thread, 1);
4145 kthread_stop(conn->rx_thread);
4149 spin_lock(&iscsit_global->ts_bitmap_lock);
4150 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4152 spin_unlock(&iscsit_global->ts_bitmap_lock);
4154 iscsit_stop_timers_for_cmds(conn);
4155 iscsit_stop_nopin_response_timer(conn);
4156 iscsit_stop_nopin_timer(conn);
4158 if (conn->conn_transport->iscsit_wait_conn)
4159 conn->conn_transport->iscsit_wait_conn(conn);
4162 * During Connection recovery drop unacknowledged out of order
4163 * commands for this connection, and prepare the other commands
4166 * During normal operation clear the out of order commands (but
4167 * do not free the struct iscsi_ooo_cmdsn's) and release all
4168 * struct iscsi_cmds.
4170 if (atomic_read(&conn->connection_recovery)) {
4171 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4172 iscsit_prepare_cmds_for_reallegiance(conn);
4174 iscsit_clear_ooo_cmdsns_for_conn(conn);
4175 iscsit_release_commands_from_conn(conn);
4177 iscsit_free_queue_reqs_for_conn(conn);
4180 * Handle decrementing session or connection usage count if
4181 * a logout response was not able to be sent because the
4182 * connection failed. Fall back to Session Recovery here.
4184 if (atomic_read(&conn->conn_logout_remove)) {
4185 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4186 iscsit_dec_conn_usage_count(conn);
4187 iscsit_dec_session_usage_count(sess);
4189 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4190 iscsit_dec_conn_usage_count(conn);
4192 atomic_set(&conn->conn_logout_remove, 0);
4193 atomic_set(&sess->session_reinstatement, 0);
4194 atomic_set(&sess->session_fall_back_to_erl0, 1);
4197 spin_lock_bh(&sess->conn_lock);
4198 list_del(&conn->conn_list);
4201 * Attempt to let the Initiator know this connection failed by
4202 * sending an Connection Dropped Async Message on another
4203 * active connection.
4205 if (atomic_read(&conn->connection_recovery))
4206 iscsit_build_conn_drop_async_message(conn);
4208 spin_unlock_bh(&sess->conn_lock);
4211 * If connection reinstatement is being performed on this connection,
4212 * up the connection reinstatement semaphore that is being blocked on
4213 * in iscsit_cause_connection_reinstatement().
4215 spin_lock_bh(&conn->state_lock);
4216 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4217 spin_unlock_bh(&conn->state_lock);
4218 complete(&conn->conn_wait_comp);
4219 wait_for_completion(&conn->conn_post_wait_comp);
4220 spin_lock_bh(&conn->state_lock);
4224 * If connection reinstatement is being performed on this connection
4225 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4226 * connection wait rcfr semaphore that is being blocked on
4227 * an iscsit_connection_reinstatement_rcfr().
4229 if (atomic_read(&conn->connection_wait_rcfr)) {
4230 spin_unlock_bh(&conn->state_lock);
4231 complete(&conn->conn_wait_rcfr_comp);
4232 wait_for_completion(&conn->conn_post_wait_comp);
4233 spin_lock_bh(&conn->state_lock);
4235 atomic_set(&conn->connection_reinstatement, 1);
4236 spin_unlock_bh(&conn->state_lock);
4239 * If any other processes are accessing this connection pointer we
4240 * must wait until they have completed.
4242 iscsit_check_conn_usage_count(conn);
4244 ahash_request_free(conn->conn_tx_hash);
4245 if (conn->conn_rx_hash) {
4246 struct crypto_ahash *tfm;
4248 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4249 ahash_request_free(conn->conn_rx_hash);
4250 crypto_free_ahash(tfm);
4254 sock_release(conn->sock);
4256 if (conn->conn_transport->iscsit_free_conn)
4257 conn->conn_transport->iscsit_free_conn(conn);
4259 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4260 conn->conn_state = TARG_CONN_STATE_FREE;
4261 iscsit_free_conn(conn);
4263 spin_lock_bh(&sess->conn_lock);
4264 atomic_dec(&sess->nconn);
4265 pr_debug("Decremented iSCSI connection count to %hu from node:"
4266 " %s\n", atomic_read(&sess->nconn),
4267 sess->sess_ops->InitiatorName);
4269 * Make sure that if one connection fails in an non ERL=2 iSCSI
4270 * Session that they all fail.
4272 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4273 !atomic_read(&sess->session_logout))
4274 atomic_set(&sess->session_fall_back_to_erl0, 1);
4277 * If this was not the last connection in the session, and we are
4278 * performing session reinstatement or falling back to ERL=0, call
4279 * iscsit_stop_session() without sleeping to shutdown the other
4280 * active connections.
4282 if (atomic_read(&sess->nconn)) {
4283 if (!atomic_read(&sess->session_reinstatement) &&
4284 !atomic_read(&sess->session_fall_back_to_erl0)) {
4285 spin_unlock_bh(&sess->conn_lock);
4288 if (!atomic_read(&sess->session_stop_active)) {
4289 atomic_set(&sess->session_stop_active, 1);
4290 spin_unlock_bh(&sess->conn_lock);
4291 iscsit_stop_session(sess, 0, 0);
4294 spin_unlock_bh(&sess->conn_lock);
4299 * If this was the last connection in the session and one of the
4300 * following is occurring:
4302 * Session Reinstatement is not being performed, and are falling back
4303 * to ERL=0 call iscsit_close_session().
4305 * Session Logout was requested. iscsit_close_session() will be called
4308 * Session Continuation is not being performed, start the Time2Retain
4309 * handler and check if sleep_on_sess_wait_sem is active.
4311 if (!atomic_read(&sess->session_reinstatement) &&
4312 atomic_read(&sess->session_fall_back_to_erl0)) {
4313 spin_unlock_bh(&sess->conn_lock);
4314 iscsit_close_session(sess);
4317 } else if (atomic_read(&sess->session_logout)) {
4318 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4319 sess->session_state = TARG_SESS_STATE_FREE;
4320 spin_unlock_bh(&sess->conn_lock);
4322 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4323 complete(&sess->session_wait_comp);
4327 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4328 sess->session_state = TARG_SESS_STATE_FAILED;
4330 if (!atomic_read(&sess->session_continuation)) {
4331 spin_unlock_bh(&sess->conn_lock);
4332 iscsit_start_time2retain_handler(sess);
4334 spin_unlock_bh(&sess->conn_lock);
4336 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4337 complete(&sess->session_wait_comp);
4344 * If the iSCSI Session for the iSCSI Initiator Node exists,
4345 * forcefully shutdown the iSCSI NEXUS.
4347 int iscsit_close_session(struct iscsi_session *sess)
4349 struct iscsi_portal_group *tpg = sess->tpg;
4350 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4352 if (atomic_read(&sess->nconn)) {
4353 pr_err("%d connection(s) still exist for iSCSI session"
4354 " to %s\n", atomic_read(&sess->nconn),
4355 sess->sess_ops->InitiatorName);
4359 spin_lock_bh(&se_tpg->session_lock);
4360 atomic_set(&sess->session_logout, 1);
4361 atomic_set(&sess->session_reinstatement, 1);
4362 iscsit_stop_time2retain_timer(sess);
4363 spin_unlock_bh(&se_tpg->session_lock);
4366 * transport_deregister_session_configfs() will clear the
4367 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4368 * can be setting it again with __transport_register_session() in
4369 * iscsi_post_login_handler() again after the iscsit_stop_session()
4370 * completes in iscsi_np context.
4372 transport_deregister_session_configfs(sess->se_sess);
4375 * If any other processes are accessing this session pointer we must
4376 * wait until they have completed. If we are in an interrupt (the
4377 * time2retain handler) and contain and active session usage count we
4378 * restart the timer and exit.
4380 if (!in_interrupt()) {
4381 if (iscsit_check_session_usage_count(sess) == 1)
4382 iscsit_stop_session(sess, 1, 1);
4384 if (iscsit_check_session_usage_count(sess) == 2) {
4385 atomic_set(&sess->session_logout, 0);
4386 iscsit_start_time2retain_handler(sess);
4391 transport_deregister_session(sess->se_sess);
4393 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4394 iscsit_free_connection_recovery_entries(sess);
4396 iscsit_free_all_ooo_cmdsns(sess);
4398 spin_lock_bh(&se_tpg->session_lock);
4399 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4400 sess->session_state = TARG_SESS_STATE_FREE;
4401 pr_debug("Released iSCSI session from node: %s\n",
4402 sess->sess_ops->InitiatorName);
4405 tpg->tpg_tiqn->tiqn_nsessions--;
4407 pr_debug("Decremented number of active iSCSI Sessions on"
4408 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4410 ida_free(&sess_ida, sess->session_index);
4411 kfree(sess->sess_ops);
4412 sess->sess_ops = NULL;
4413 spin_unlock_bh(&se_tpg->session_lock);
4419 static void iscsit_logout_post_handler_closesession(
4420 struct iscsi_conn *conn)
4422 struct iscsi_session *sess = conn->sess;
4425 * Traditional iscsi/tcp will invoke this logic from TX thread
4426 * context during session logout, so clear tx_thread_active and
4427 * sleep if iscsit_close_connection() has not already occured.
4429 * Since iser-target invokes this logic from it's own workqueue,
4430 * always sleep waiting for RX/TX thread shutdown to complete
4431 * within iscsit_close_connection().
4433 if (!conn->conn_transport->rdma_shutdown) {
4434 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4439 atomic_set(&conn->conn_logout_remove, 0);
4440 complete(&conn->conn_logout_comp);
4442 iscsit_dec_conn_usage_count(conn);
4443 iscsit_stop_session(sess, sleep, sleep);
4444 iscsit_dec_session_usage_count(sess);
4445 iscsit_close_session(sess);
4448 static void iscsit_logout_post_handler_samecid(
4449 struct iscsi_conn *conn)
4453 if (!conn->conn_transport->rdma_shutdown) {
4454 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4459 atomic_set(&conn->conn_logout_remove, 0);
4460 complete(&conn->conn_logout_comp);
4462 iscsit_cause_connection_reinstatement(conn, sleep);
4463 iscsit_dec_conn_usage_count(conn);
4466 static void iscsit_logout_post_handler_diffcid(
4467 struct iscsi_conn *conn,
4470 struct iscsi_conn *l_conn;
4471 struct iscsi_session *sess = conn->sess;
4472 bool conn_found = false;
4477 spin_lock_bh(&sess->conn_lock);
4478 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4479 if (l_conn->cid == cid) {
4480 iscsit_inc_conn_usage_count(l_conn);
4485 spin_unlock_bh(&sess->conn_lock);
4491 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4493 spin_lock_bh(&l_conn->state_lock);
4494 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4495 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4496 spin_unlock_bh(&l_conn->state_lock);
4498 iscsit_cause_connection_reinstatement(l_conn, 1);
4499 iscsit_dec_conn_usage_count(l_conn);
4503 * Return of 0 causes the TX thread to restart.
4505 int iscsit_logout_post_handler(
4506 struct iscsi_cmd *cmd,
4507 struct iscsi_conn *conn)
4511 switch (cmd->logout_reason) {
4512 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4513 switch (cmd->logout_response) {
4514 case ISCSI_LOGOUT_SUCCESS:
4515 case ISCSI_LOGOUT_CLEANUP_FAILED:
4517 iscsit_logout_post_handler_closesession(conn);
4522 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4523 if (conn->cid == cmd->logout_cid) {
4524 switch (cmd->logout_response) {
4525 case ISCSI_LOGOUT_SUCCESS:
4526 case ISCSI_LOGOUT_CLEANUP_FAILED:
4528 iscsit_logout_post_handler_samecid(conn);
4533 switch (cmd->logout_response) {
4534 case ISCSI_LOGOUT_SUCCESS:
4535 iscsit_logout_post_handler_diffcid(conn,
4538 case ISCSI_LOGOUT_CID_NOT_FOUND:
4539 case ISCSI_LOGOUT_CLEANUP_FAILED:
4546 case ISCSI_LOGOUT_REASON_RECOVERY:
4547 switch (cmd->logout_response) {
4548 case ISCSI_LOGOUT_SUCCESS:
4549 case ISCSI_LOGOUT_CID_NOT_FOUND:
4550 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4551 case ISCSI_LOGOUT_CLEANUP_FAILED:
4563 EXPORT_SYMBOL(iscsit_logout_post_handler);
4565 void iscsit_fail_session(struct iscsi_session *sess)
4567 struct iscsi_conn *conn;
4569 spin_lock_bh(&sess->conn_lock);
4570 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4571 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4572 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4574 spin_unlock_bh(&sess->conn_lock);
4576 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4577 sess->session_state = TARG_SESS_STATE_FAILED;
4580 int iscsit_free_session(struct iscsi_session *sess)
4582 u16 conn_count = atomic_read(&sess->nconn);
4583 struct iscsi_conn *conn, *conn_tmp = NULL;
4586 spin_lock_bh(&sess->conn_lock);
4587 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4589 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4591 if (conn_count == 0)
4594 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4597 iscsit_inc_conn_usage_count(conn_tmp);
4600 iscsit_inc_conn_usage_count(conn);
4602 spin_unlock_bh(&sess->conn_lock);
4603 iscsit_cause_connection_reinstatement(conn, 1);
4604 spin_lock_bh(&sess->conn_lock);
4606 iscsit_dec_conn_usage_count(conn);
4608 iscsit_dec_conn_usage_count(conn_tmp);
4613 if (atomic_read(&sess->nconn)) {
4614 spin_unlock_bh(&sess->conn_lock);
4615 wait_for_completion(&sess->session_wait_comp);
4617 spin_unlock_bh(&sess->conn_lock);
4619 iscsit_close_session(sess);
4623 void iscsit_stop_session(
4624 struct iscsi_session *sess,
4626 int connection_sleep)
4628 u16 conn_count = atomic_read(&sess->nconn);
4629 struct iscsi_conn *conn, *conn_tmp = NULL;
4632 spin_lock_bh(&sess->conn_lock);
4634 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4636 if (connection_sleep) {
4637 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4639 if (conn_count == 0)
4642 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4645 iscsit_inc_conn_usage_count(conn_tmp);
4648 iscsit_inc_conn_usage_count(conn);
4650 spin_unlock_bh(&sess->conn_lock);
4651 iscsit_cause_connection_reinstatement(conn, 1);
4652 spin_lock_bh(&sess->conn_lock);
4654 iscsit_dec_conn_usage_count(conn);
4656 iscsit_dec_conn_usage_count(conn_tmp);
4660 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4661 iscsit_cause_connection_reinstatement(conn, 0);
4664 if (session_sleep && atomic_read(&sess->nconn)) {
4665 spin_unlock_bh(&sess->conn_lock);
4666 wait_for_completion(&sess->session_wait_comp);
4668 spin_unlock_bh(&sess->conn_lock);
4671 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4673 struct iscsi_session *sess;
4674 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4675 struct se_session *se_sess, *se_sess_tmp;
4676 LIST_HEAD(free_list);
4677 int session_count = 0;
4679 spin_lock_bh(&se_tpg->session_lock);
4680 if (tpg->nsessions && !force) {
4681 spin_unlock_bh(&se_tpg->session_lock);
4685 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4687 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4689 spin_lock(&sess->conn_lock);
4690 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4691 atomic_read(&sess->session_logout) ||
4692 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4693 spin_unlock(&sess->conn_lock);
4696 atomic_set(&sess->session_reinstatement, 1);
4697 atomic_set(&sess->session_fall_back_to_erl0, 1);
4698 spin_unlock(&sess->conn_lock);
4700 list_move_tail(&se_sess->sess_list, &free_list);
4702 spin_unlock_bh(&se_tpg->session_lock);
4704 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4705 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4707 iscsit_free_session(sess);
4711 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4712 " Group: %hu\n", session_count, tpg->tpgt);
4716 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4717 MODULE_VERSION("4.1.x");
4718 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4719 MODULE_LICENSE("GPL");
4721 module_init(iscsi_target_init_module);
4722 module_exit(iscsi_target_cleanup_module);