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>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
51 #include <target/iscsi/iscsi_transport.h>
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
58 static struct idr tiqn_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_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))
312 * Called with mutex np_lock held
314 static struct iscsi_np *iscsit_get_np(
315 struct sockaddr_storage *sockaddr,
316 int network_transport)
321 list_for_each_entry(np, &g_np_list, np_list) {
322 spin_lock_bh(&np->np_thread_lock);
323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324 spin_unlock_bh(&np->np_thread_lock);
328 match = iscsit_check_np_match(sockaddr, np, network_transport);
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
336 spin_unlock_bh(&np->np_thread_lock);
339 spin_unlock_bh(&np->np_thread_lock);
345 struct iscsi_np *iscsit_add_np(
346 struct sockaddr_storage *sockaddr,
347 int network_transport)
352 mutex_lock(&np_lock);
355 * Locate the existing struct iscsi_np if already active..
357 np = iscsit_get_np(sockaddr, network_transport);
359 mutex_unlock(&np_lock);
363 np = kzalloc(sizeof(*np), GFP_KERNEL);
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
375 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
377 ret = iscsi_target_setup_login_socket(np, sockaddr);
380 mutex_unlock(&np_lock);
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
389 mutex_unlock(&np_lock);
393 * Increment the np_exports reference count now to prevent
394 * iscsit_del_np() below from being run while a new call to
395 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
396 * active. We don't need to hold np->np_thread_lock at this
397 * point because iscsi_np has not been added to g_np_list yet.
400 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
402 list_add_tail(&np->np_list, &g_np_list);
403 mutex_unlock(&np_lock);
405 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
406 &np->np_sockaddr, np->np_transport->name);
411 int iscsit_reset_np_thread(
413 struct iscsi_tpg_np *tpg_np,
414 struct iscsi_portal_group *tpg,
417 spin_lock_bh(&np->np_thread_lock);
418 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
419 spin_unlock_bh(&np->np_thread_lock);
422 np->np_thread_state = ISCSI_NP_THREAD_RESET;
423 atomic_inc(&np->np_reset_count);
426 spin_unlock_bh(&np->np_thread_lock);
427 send_sig(SIGINT, np->np_thread, 1);
428 wait_for_completion(&np->np_restart_comp);
429 spin_lock_bh(&np->np_thread_lock);
431 spin_unlock_bh(&np->np_thread_lock);
433 if (tpg_np && shutdown) {
434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
436 wait_for_completion(&tpg_np->tpg_np_comp);
442 static void iscsit_free_np(struct iscsi_np *np)
445 sock_release(np->np_socket);
448 int iscsit_del_np(struct iscsi_np *np)
450 spin_lock_bh(&np->np_thread_lock);
452 if (np->np_exports) {
454 spin_unlock_bh(&np->np_thread_lock);
457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
458 spin_unlock_bh(&np->np_thread_lock);
462 * We need to send the signal to wakeup Linux/Net
463 * which may be sleeping in sock_accept()..
465 send_sig(SIGINT, np->np_thread, 1);
466 kthread_stop(np->np_thread);
467 np->np_thread = NULL;
470 np->np_transport->iscsit_free_np(np);
472 mutex_lock(&np_lock);
473 list_del(&np->np_list);
474 mutex_unlock(&np_lock);
476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
477 &np->np_sockaddr, np->np_transport->name);
479 iscsit_put_transport(np->np_transport);
484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
488 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
490 EXPORT_SYMBOL(iscsit_queue_rsp);
492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node) &&
496 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
497 list_del_init(&cmd->i_conn_node);
498 spin_unlock_bh(&conn->cmd_lock);
500 __iscsit_free_cmd(cmd, true);
502 EXPORT_SYMBOL(iscsit_aborted_task);
504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
505 u32, u32, u8 *, u8 *);
506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
510 const void *data_buf, u32 data_buf_len)
512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
514 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
517 iov = &cmd->iov_misc[0];
518 iov[niov].iov_base = cmd->pdu;
519 iov[niov++].iov_len = ISCSI_HDR_LEN;
521 if (conn->conn_ops->HeaderDigest) {
522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
525 ISCSI_HDR_LEN, 0, NULL,
526 (u8 *)header_digest);
528 iov[0].iov_len += ISCSI_CRC_LEN;
529 tx_size += ISCSI_CRC_LEN;
530 pr_debug("Attaching CRC32C HeaderDigest"
531 " to opcode 0x%x 0x%08x\n",
532 hdr->opcode, *header_digest);
536 u32 padding = ((-data_buf_len) & 3);
538 iov[niov].iov_base = (void *)data_buf;
539 iov[niov++].iov_len = data_buf_len;
540 tx_size += data_buf_len;
543 iov[niov].iov_base = &cmd->pad_bytes;
544 iov[niov++].iov_len = padding;
546 pr_debug("Attaching %u additional"
547 " padding bytes.\n", padding);
550 if (conn->conn_ops->DataDigest) {
551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
552 data_buf, data_buf_len,
554 (u8 *)&cmd->pad_bytes,
555 (u8 *)&cmd->data_crc);
557 iov[niov].iov_base = &cmd->data_crc;
558 iov[niov++].iov_len = ISCSI_CRC_LEN;
559 tx_size += ISCSI_CRC_LEN;
560 pr_debug("Attached DataDigest for %u"
561 " bytes opcode 0x%x, CRC 0x%08x\n",
562 data_buf_len, hdr->opcode, cmd->data_crc);
566 cmd->iov_misc_count = niov;
567 cmd->tx_size = tx_size;
569 ret = iscsit_send_tx_data(cmd, conn, 1);
571 iscsit_tx_thread_wait_for_tcp(conn);
578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
579 static void iscsit_unmap_iovec(struct iscsi_cmd *);
580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
581 u32, u32, u32, u8 *);
583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
584 const struct iscsi_datain *datain)
587 u32 iov_count = 0, tx_size = 0;
590 iov = &cmd->iov_data[0];
591 iov[iov_count].iov_base = cmd->pdu;
592 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
593 tx_size += ISCSI_HDR_LEN;
595 if (conn->conn_ops->HeaderDigest) {
596 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
598 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
599 ISCSI_HDR_LEN, 0, NULL,
600 (u8 *)header_digest);
602 iov[0].iov_len += ISCSI_CRC_LEN;
603 tx_size += ISCSI_CRC_LEN;
605 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
609 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
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);
703 spin_lock_init(&sess_idr_lock);
707 ret = target_register_template(&iscsi_ops);
711 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
712 iscsit_global->ts_bitmap = vzalloc(size);
713 if (!iscsit_global->ts_bitmap)
716 lio_qr_cache = kmem_cache_create("lio_qr_cache",
717 sizeof(struct iscsi_queue_req),
718 __alignof__(struct iscsi_queue_req), 0, NULL);
720 pr_err("nable to kmem_cache_create() for"
725 lio_dr_cache = kmem_cache_create("lio_dr_cache",
726 sizeof(struct iscsi_datain_req),
727 __alignof__(struct iscsi_datain_req), 0, NULL);
729 pr_err("Unable to kmem_cache_create() for"
734 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
735 sizeof(struct iscsi_ooo_cmdsn),
736 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
737 if (!lio_ooo_cache) {
738 pr_err("Unable to kmem_cache_create() for"
743 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
744 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
746 if (!lio_r2t_cache) {
747 pr_err("Unable to kmem_cache_create() for"
752 iscsit_register_transport(&iscsi_target_transport);
754 if (iscsit_load_discovery_tpg() < 0)
759 iscsit_unregister_transport(&iscsi_target_transport);
760 kmem_cache_destroy(lio_r2t_cache);
762 kmem_cache_destroy(lio_ooo_cache);
764 kmem_cache_destroy(lio_dr_cache);
766 kmem_cache_destroy(lio_qr_cache);
768 vfree(iscsit_global->ts_bitmap);
770 /* XXX: this probably wants it to be it's own unwind step.. */
771 if (iscsit_global->discovery_tpg)
772 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
773 target_unregister_template(&iscsi_ops);
775 kfree(iscsit_global);
779 static void __exit iscsi_target_cleanup_module(void)
781 iscsit_release_discovery_tpg();
782 iscsit_unregister_transport(&iscsi_target_transport);
783 kmem_cache_destroy(lio_qr_cache);
784 kmem_cache_destroy(lio_dr_cache);
785 kmem_cache_destroy(lio_ooo_cache);
786 kmem_cache_destroy(lio_r2t_cache);
789 * Shutdown discovery sessions and disable discovery TPG
791 if (iscsit_global->discovery_tpg)
792 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
794 target_unregister_template(&iscsi_ops);
796 vfree(iscsit_global->ts_bitmap);
797 kfree(iscsit_global);
800 int iscsit_add_reject(
801 struct iscsi_conn *conn,
805 struct iscsi_cmd *cmd;
807 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
811 cmd->iscsi_opcode = ISCSI_OP_REJECT;
812 cmd->reject_reason = reason;
814 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
816 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
817 iscsit_free_cmd(cmd, false);
821 spin_lock_bh(&conn->cmd_lock);
822 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
823 spin_unlock_bh(&conn->cmd_lock);
825 cmd->i_state = ISTATE_SEND_REJECT;
826 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
830 EXPORT_SYMBOL(iscsit_add_reject);
832 static int iscsit_add_reject_from_cmd(
833 struct iscsi_cmd *cmd,
838 struct iscsi_conn *conn;
841 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
847 cmd->iscsi_opcode = ISCSI_OP_REJECT;
848 cmd->reject_reason = reason;
850 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
852 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
853 iscsit_free_cmd(cmd, false);
858 spin_lock_bh(&conn->cmd_lock);
859 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
860 spin_unlock_bh(&conn->cmd_lock);
863 cmd->i_state = ISTATE_SEND_REJECT;
864 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
866 * Perform the kref_put now if se_cmd has already been setup by
867 * scsit_setup_scsi_cmd()
869 if (cmd->se_cmd.se_tfo != NULL) {
870 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
871 target_put_sess_cmd(&cmd->se_cmd);
876 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
879 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
882 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
884 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
886 EXPORT_SYMBOL(iscsit_reject_cmd);
889 * Map some portion of the allocated scatterlist to an iovec, suitable for
890 * kernel sockets to copy data in/out.
892 static int iscsit_map_iovec(
893 struct iscsi_cmd *cmd,
899 struct scatterlist *sg;
900 unsigned int page_off;
903 * We know each entry in t_data_sg contains a page.
905 u32 ent = data_offset / PAGE_SIZE;
907 if (ent >= cmd->se_cmd.t_data_nents) {
908 pr_err("Initial page entry out-of-bounds\n");
912 sg = &cmd->se_cmd.t_data_sg[ent];
913 page_off = (data_offset % PAGE_SIZE);
915 cmd->first_data_sg = sg;
916 cmd->first_data_sg_off = page_off;
918 while (data_length) {
919 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
921 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
922 iov[i].iov_len = cur_len;
924 data_length -= cur_len;
930 cmd->kmapped_nents = i;
935 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
938 struct scatterlist *sg;
940 sg = cmd->first_data_sg;
942 for (i = 0; i < cmd->kmapped_nents; i++)
943 kunmap(sg_page(&sg[i]));
946 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
949 struct iscsi_cmd *cmd, *cmd_p;
951 conn->exp_statsn = exp_statsn;
953 if (conn->sess->sess_ops->RDMAExtensions)
956 spin_lock_bh(&conn->cmd_lock);
957 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
958 spin_lock(&cmd->istate_lock);
959 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
960 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
961 cmd->i_state = ISTATE_REMOVE;
962 spin_unlock(&cmd->istate_lock);
963 list_move_tail(&cmd->i_conn_node, &ack_list);
966 spin_unlock(&cmd->istate_lock);
968 spin_unlock_bh(&conn->cmd_lock);
970 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
971 list_del_init(&cmd->i_conn_node);
972 iscsit_free_cmd(cmd, false);
976 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
978 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
980 iov_count += ISCSI_IOV_DATA_BUFFER;
981 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
985 cmd->orig_iov_data_count = iov_count;
989 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
992 int data_direction, payload_length;
993 struct iscsi_scsi_req *hdr;
997 atomic_long_inc(&conn->sess->cmd_pdus);
999 hdr = (struct iscsi_scsi_req *) buf;
1000 payload_length = ntoh24(hdr->dlength);
1002 /* FIXME; Add checks for AdditionalHeaderSegment */
1004 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1005 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1006 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1007 " not set. Bad iSCSI Initiator.\n");
1008 return iscsit_add_reject_cmd(cmd,
1009 ISCSI_REASON_BOOKMARK_INVALID, buf);
1012 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1013 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1015 * From RFC-3720 Section 10.3.1:
1017 * "Either or both of R and W MAY be 1 when either the
1018 * Expected Data Transfer Length and/or Bidirectional Read
1019 * Expected Data Transfer Length are 0"
1021 * For this case, go ahead and clear the unnecssary bits
1022 * to avoid any confusion with ->data_direction.
1024 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1025 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1027 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1028 " set when Expected Data Transfer Length is 0 for"
1029 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1032 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1033 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1034 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1035 " MUST be set if Expected Data Transfer Length is not 0."
1036 " Bad iSCSI Initiator\n");
1037 return iscsit_add_reject_cmd(cmd,
1038 ISCSI_REASON_BOOKMARK_INVALID, buf);
1041 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1043 pr_err("Bidirectional operations not supported!\n");
1044 return iscsit_add_reject_cmd(cmd,
1045 ISCSI_REASON_BOOKMARK_INVALID, buf);
1048 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1049 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1050 " Scsi Command PDU.\n");
1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
1055 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1056 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1057 " protocol error.\n", payload_length);
1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_PROTOCOL_ERROR, buf);
1062 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1063 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1064 pr_err("Expected Data Transfer Length and Length of"
1065 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1066 " bit is not set protocol error\n");
1067 return iscsit_add_reject_cmd(cmd,
1068 ISCSI_REASON_PROTOCOL_ERROR, buf);
1071 if (payload_length > be32_to_cpu(hdr->data_length)) {
1072 pr_err("DataSegmentLength: %u is greater than"
1073 " EDTL: %u, protocol error.\n", payload_length,
1075 return iscsit_add_reject_cmd(cmd,
1076 ISCSI_REASON_PROTOCOL_ERROR, buf);
1079 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1080 pr_err("DataSegmentLength: %u is greater than"
1081 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1082 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1083 return iscsit_add_reject_cmd(cmd,
1084 ISCSI_REASON_PROTOCOL_ERROR, buf);
1087 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1088 pr_err("DataSegmentLength: %u is greater than"
1089 " FirstBurstLength: %u, protocol error.\n",
1090 payload_length, conn->sess->sess_ops->FirstBurstLength);
1091 return iscsit_add_reject_cmd(cmd,
1092 ISCSI_REASON_BOOKMARK_INVALID, buf);
1095 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1096 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1099 cmd->data_direction = data_direction;
1100 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1102 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1104 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1105 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1106 sam_task_attr = TCM_SIMPLE_TAG;
1107 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1108 sam_task_attr = TCM_ORDERED_TAG;
1109 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1110 sam_task_attr = TCM_HEAD_TAG;
1111 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1112 sam_task_attr = TCM_ACA_TAG;
1114 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1115 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1116 sam_task_attr = TCM_SIMPLE_TAG;
1119 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1120 cmd->i_state = ISTATE_NEW_CMD;
1121 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1122 cmd->immediate_data = (payload_length) ? 1 : 0;
1123 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1124 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1125 if (cmd->unsolicited_data)
1126 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1128 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1129 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1130 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1132 cmd->targ_xfer_tag = 0xFFFFFFFF;
1133 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1134 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1135 cmd->first_burst_len = payload_length;
1137 if (!conn->sess->sess_ops->RDMAExtensions &&
1138 cmd->data_direction == DMA_FROM_DEVICE) {
1139 struct iscsi_datain_req *dr;
1141 dr = iscsit_allocate_datain_req();
1143 return iscsit_add_reject_cmd(cmd,
1144 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1146 iscsit_attach_datain_req(cmd, dr);
1150 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1152 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1153 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1154 cmd->data_direction, sam_task_attr,
1155 cmd->sense_buffer + 2);
1157 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1158 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1159 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1162 target_get_sess_cmd(&cmd->se_cmd, true);
1164 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1165 scsilun_to_int(&hdr->lun));
1166 if (cmd->sense_reason)
1169 /* only used for printks or comparing with ->ref_task_tag */
1170 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1171 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1172 if (cmd->sense_reason) {
1173 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1174 return iscsit_add_reject_cmd(cmd,
1175 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1181 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1182 return iscsit_add_reject_cmd(cmd,
1183 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1187 spin_lock_bh(&conn->cmd_lock);
1188 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1189 spin_unlock_bh(&conn->cmd_lock);
1191 * Check if we need to delay processing because of ALUA
1192 * Active/NonOptimized primary access state..
1194 core_alua_check_nonop_delay(&cmd->se_cmd);
1198 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1200 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1202 iscsit_set_dataout_sequence_values(cmd);
1204 spin_lock_bh(&cmd->dataout_timeout_lock);
1205 iscsit_start_dataout_timer(cmd, cmd->conn);
1206 spin_unlock_bh(&cmd->dataout_timeout_lock);
1208 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1210 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1211 struct iscsi_scsi_req *hdr)
1215 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1216 * the Immediate Bit is not set, and no Immediate
1219 * A PDU/CmdSN carrying Immediate Data can only
1220 * be processed after the DataCRC has passed.
1221 * If the DataCRC fails, the CmdSN MUST NOT
1222 * be acknowledged. (See below)
1224 if (!cmd->immediate_data) {
1225 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1226 (unsigned char *)hdr, hdr->cmdsn);
1227 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1229 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1230 target_put_sess_cmd(&cmd->se_cmd);
1235 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1238 * If no Immediate Data is attached, it's OK to return now.
1240 if (!cmd->immediate_data) {
1241 if (!cmd->sense_reason && cmd->unsolicited_data)
1242 iscsit_set_unsoliticed_dataout(cmd);
1243 if (!cmd->sense_reason)
1246 target_put_sess_cmd(&cmd->se_cmd);
1251 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1252 * execution. These exceptions are processed in CmdSN order using
1253 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1255 if (cmd->sense_reason)
1258 * Call directly into transport_generic_new_cmd() to perform
1259 * the backend memory allocation.
1261 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1262 if (cmd->sense_reason)
1267 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1270 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1273 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1275 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1278 goto after_immediate_data;
1280 * Check for underflow case where both EDTL and immediate data payload
1281 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1282 * already been set in target_cmd_size_check() as se_cmd->data_length.
1284 * For this special case, fail the command and dump the immediate data
1287 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1288 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1289 goto after_immediate_data;
1292 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1293 cmd->first_burst_len);
1294 after_immediate_data:
1295 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1297 * A PDU/CmdSN carrying Immediate Data passed
1298 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1299 * Immediate Bit is not set.
1301 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1302 (unsigned char *)hdr, hdr->cmdsn);
1303 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1306 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1309 rc = iscsit_dump_data_payload(cmd->conn,
1310 cmd->first_burst_len, 1);
1311 target_put_sess_cmd(&cmd->se_cmd);
1313 } else if (cmd->unsolicited_data)
1314 iscsit_set_unsoliticed_dataout(cmd);
1316 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1318 * Immediate Data failed DataCRC and ERL>=1,
1319 * silently drop this PDU and let the initiator
1320 * plug the CmdSN gap.
1322 * FIXME: Send Unsolicited NOPIN with reserved
1323 * TTT here to help the initiator figure out
1324 * the missing CmdSN, although they should be
1325 * intelligent enough to determine the missing
1326 * CmdSN and issue a retry to plug the sequence.
1328 cmd->i_state = ISTATE_REMOVE;
1329 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1330 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1337 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1340 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1342 bool dump_payload = false;
1344 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1348 * Allocation iovecs needed for struct socket operations for
1349 * traditional iSCSI block I/O.
1351 if (iscsit_allocate_iovecs(cmd) < 0) {
1352 return iscsit_reject_cmd(cmd,
1353 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1355 immed_data = cmd->immediate_data;
1357 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1361 dump_payload = true;
1366 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1369 static u32 iscsit_do_crypto_hash_sg(
1370 struct ahash_request *hash,
1371 struct iscsi_cmd *cmd,
1378 struct scatterlist *sg;
1379 unsigned int page_off;
1381 crypto_ahash_init(hash);
1383 sg = cmd->first_data_sg;
1384 page_off = cmd->first_data_sg_off;
1386 while (data_length) {
1387 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1389 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1390 crypto_ahash_update(hash);
1392 data_length -= cur_len;
1394 /* iscsit_map_iovec has already checked for invalid sg pointers */
1399 struct scatterlist pad_sg;
1401 sg_init_one(&pad_sg, pad_bytes, padding);
1402 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1404 crypto_ahash_finup(hash);
1406 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1407 crypto_ahash_final(hash);
1413 static void iscsit_do_crypto_hash_buf(
1414 struct ahash_request *hash,
1421 struct scatterlist sg[2];
1423 sg_init_table(sg, ARRAY_SIZE(sg));
1424 sg_set_buf(sg, buf, payload_length);
1425 sg_set_buf(sg + 1, pad_bytes, padding);
1427 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1429 crypto_ahash_digest(hash);
1433 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1434 struct iscsi_cmd *cmd, u32 payload_length,
1437 struct iscsi_data *hdr = buf;
1438 struct se_cmd *se_cmd;
1442 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1444 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1445 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1446 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1447 payload_length, conn->cid);
1449 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1450 pr_err("Command ITT: 0x%08x received DataOUT after"
1451 " last DataOUT received, dumping payload\n",
1452 cmd->init_task_tag);
1453 return iscsit_dump_data_payload(conn, payload_length, 1);
1456 if (cmd->data_direction != DMA_TO_DEVICE) {
1457 pr_err("Command ITT: 0x%08x received DataOUT for a"
1458 " NON-WRITE command.\n", cmd->init_task_tag);
1459 return iscsit_dump_data_payload(conn, payload_length, 1);
1461 se_cmd = &cmd->se_cmd;
1462 iscsit_mod_dataout_timer(cmd);
1464 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1465 pr_err("DataOut Offset: %u, Length %u greater than"
1466 " iSCSI Command EDTL %u, protocol error.\n",
1467 hdr->offset, payload_length, cmd->se_cmd.data_length);
1468 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1471 if (cmd->unsolicited_data) {
1472 int dump_unsolicited_data = 0;
1474 if (conn->sess->sess_ops->InitialR2T) {
1475 pr_err("Received unexpected unsolicited data"
1476 " while InitialR2T=Yes, protocol error.\n");
1477 transport_send_check_condition_and_sense(&cmd->se_cmd,
1478 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1482 * Special case for dealing with Unsolicited DataOUT
1483 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1487 /* Something's amiss if we're not in WRITE_PENDING state... */
1488 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1489 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1490 dump_unsolicited_data = 1;
1492 if (dump_unsolicited_data) {
1494 * Check if a delayed TASK_ABORTED status needs to
1495 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1496 * received with the unsolicited data out.
1498 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1499 iscsit_stop_dataout_timer(cmd);
1501 transport_check_aborted_status(se_cmd,
1502 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1503 return iscsit_dump_data_payload(conn, payload_length, 1);
1507 * For the normal solicited data path:
1509 * Check for a delayed TASK_ABORTED status and dump any
1510 * incoming data out payload if one exists. Also, when the
1511 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1512 * data out sequence, we decrement outstanding_r2ts. Once
1513 * outstanding_r2ts reaches zero, go ahead and send the delayed
1514 * TASK_ABORTED status.
1516 if (se_cmd->transport_state & CMD_T_ABORTED) {
1517 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1518 if (--cmd->outstanding_r2ts < 1) {
1519 iscsit_stop_dataout_timer(cmd);
1520 transport_check_aborted_status(
1524 return iscsit_dump_data_payload(conn, payload_length, 1);
1528 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1529 * within-command recovery checks before receiving the payload.
1531 rc = iscsit_check_pre_dataout(cmd, buf);
1532 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1534 else if (rc == DATAOUT_CANNOT_RECOVER)
1539 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1542 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1543 struct iscsi_cmd **out_cmd)
1545 struct iscsi_data *hdr = buf;
1546 struct iscsi_cmd *cmd;
1547 u32 payload_length = ntoh24(hdr->dlength);
1549 bool success = false;
1551 if (!payload_length) {
1552 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1556 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1557 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1558 " MaxXmitDataSegmentLength: %u\n", payload_length,
1559 conn->conn_ops->MaxXmitDataSegmentLength);
1560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1563 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1567 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1574 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1577 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1578 struct iscsi_data *hdr)
1581 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1582 u32 payload_length = ntoh24(hdr->dlength);
1583 int iov_ret, data_crc_failed = 0;
1585 rx_size += payload_length;
1586 iov = &cmd->iov_data[0];
1588 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1593 iov_count += iov_ret;
1595 padding = ((-payload_length) & 3);
1597 iov[iov_count].iov_base = cmd->pad_bytes;
1598 iov[iov_count++].iov_len = padding;
1600 pr_debug("Receiving %u padding bytes.\n", padding);
1603 if (conn->conn_ops->DataDigest) {
1604 iov[iov_count].iov_base = &checksum;
1605 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1606 rx_size += ISCSI_CRC_LEN;
1609 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1611 iscsit_unmap_iovec(cmd);
1613 if (rx_got != rx_size)
1616 if (conn->conn_ops->DataDigest) {
1619 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1620 be32_to_cpu(hdr->offset),
1621 payload_length, padding,
1624 if (checksum != data_crc) {
1625 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1626 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1627 " does not match computed 0x%08x\n",
1628 hdr->itt, hdr->offset, payload_length,
1629 hdr->datasn, checksum, data_crc);
1630 data_crc_failed = 1;
1632 pr_debug("Got CRC32C DataDigest 0x%08x for"
1633 " %u bytes of Data Out\n", checksum,
1638 return data_crc_failed;
1642 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1643 bool data_crc_failed)
1645 struct iscsi_conn *conn = cmd->conn;
1648 * Increment post receive data and CRC values or perform
1649 * within-command recovery.
1651 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1652 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1654 else if (rc == DATAOUT_SEND_R2T) {
1655 iscsit_set_dataout_sequence_values(cmd);
1656 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1657 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1659 * Handle extra special case for out of order
1660 * Unsolicited Data Out.
1662 spin_lock_bh(&cmd->istate_lock);
1663 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1664 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1665 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1666 spin_unlock_bh(&cmd->istate_lock);
1668 iscsit_stop_dataout_timer(cmd);
1671 target_execute_cmd(&cmd->se_cmd);
1673 } else /* DATAOUT_CANNOT_RECOVER */
1678 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1680 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1682 struct iscsi_cmd *cmd = NULL;
1683 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1685 bool data_crc_failed = false;
1687 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1693 rc = iscsit_get_dataout(conn, cmd, hdr);
1697 data_crc_failed = true;
1699 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1702 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1703 struct iscsi_nopout *hdr)
1705 u32 payload_length = ntoh24(hdr->dlength);
1707 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1708 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1710 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1711 (unsigned char *)hdr);
1713 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1714 (unsigned char *)hdr);
1717 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1718 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1719 " not set, protocol error.\n");
1721 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1722 (unsigned char *)hdr);
1724 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1725 (unsigned char *)hdr);
1728 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1729 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1730 " greater than MaxXmitDataSegmentLength: %u, protocol"
1731 " error.\n", payload_length,
1732 conn->conn_ops->MaxXmitDataSegmentLength);
1734 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1735 (unsigned char *)hdr);
1737 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1738 (unsigned char *)hdr);
1741 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1742 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1743 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1744 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1747 * This is not a response to a Unsolicited NopIN, which means
1748 * it can either be a NOPOUT ping request (with a valid ITT),
1749 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1750 * Either way, make sure we allocate an struct iscsi_cmd, as both
1751 * can contain ping data.
1753 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1754 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1755 cmd->i_state = ISTATE_SEND_NOPIN;
1756 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1758 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1759 cmd->targ_xfer_tag = 0xFFFFFFFF;
1760 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1761 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1762 cmd->data_direction = DMA_NONE;
1767 EXPORT_SYMBOL(iscsit_setup_nop_out);
1769 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1770 struct iscsi_nopout *hdr)
1772 struct iscsi_cmd *cmd_p = NULL;
1775 * Initiator is expecting a NopIN ping reply..
1777 if (hdr->itt != RESERVED_ITT) {
1779 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1780 (unsigned char *)hdr);
1782 spin_lock_bh(&conn->cmd_lock);
1783 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1784 spin_unlock_bh(&conn->cmd_lock);
1786 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1788 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1789 iscsit_add_cmd_to_response_queue(cmd, conn,
1794 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1795 (unsigned char *)hdr, hdr->cmdsn);
1796 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1798 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1804 * This was a response to a unsolicited NOPIN ping.
1806 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1807 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1811 iscsit_stop_nopin_response_timer(conn);
1813 cmd_p->i_state = ISTATE_REMOVE;
1814 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1816 iscsit_start_nopin_timer(conn);
1820 * Otherwise, initiator is not expecting a NOPIN is response.
1821 * Just ignore for now.
1825 iscsit_free_cmd(cmd, false);
1829 EXPORT_SYMBOL(iscsit_process_nop_out);
1831 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1834 unsigned char *ping_data = NULL;
1835 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1836 struct kvec *iov = NULL;
1837 u32 payload_length = ntoh24(hdr->dlength);
1840 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1844 * Handle NOP-OUT payload for traditional iSCSI sockets
1846 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1847 u32 checksum, data_crc, padding = 0;
1848 int niov = 0, rx_got, rx_size = payload_length;
1850 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1856 iov = &cmd->iov_misc[0];
1857 iov[niov].iov_base = ping_data;
1858 iov[niov++].iov_len = payload_length;
1860 padding = ((-payload_length) & 3);
1862 pr_debug("Receiving %u additional bytes"
1863 " for padding.\n", padding);
1864 iov[niov].iov_base = &cmd->pad_bytes;
1865 iov[niov++].iov_len = padding;
1868 if (conn->conn_ops->DataDigest) {
1869 iov[niov].iov_base = &checksum;
1870 iov[niov++].iov_len = ISCSI_CRC_LEN;
1871 rx_size += ISCSI_CRC_LEN;
1874 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1875 if (rx_got != rx_size) {
1880 if (conn->conn_ops->DataDigest) {
1881 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1882 ping_data, payload_length,
1883 padding, cmd->pad_bytes,
1886 if (checksum != data_crc) {
1887 pr_err("Ping data CRC32C DataDigest"
1888 " 0x%08x does not match computed 0x%08x\n",
1889 checksum, data_crc);
1890 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1891 pr_err("Unable to recover from"
1892 " NOPOUT Ping DataCRC failure while in"
1898 * Silently drop this PDU and let the
1899 * initiator plug the CmdSN gap.
1901 pr_debug("Dropping NOPOUT"
1902 " Command CmdSN: 0x%08x due to"
1903 " DataCRC error.\n", hdr->cmdsn);
1908 pr_debug("Got CRC32C DataDigest"
1909 " 0x%08x for %u bytes of ping data.\n",
1910 checksum, payload_length);
1914 ping_data[payload_length] = '\0';
1916 * Attach ping data to struct iscsi_cmd->buf_ptr.
1918 cmd->buf_ptr = ping_data;
1919 cmd->buf_ptr_size = payload_length;
1921 pr_debug("Got %u bytes of NOPOUT ping"
1922 " data.\n", payload_length);
1923 pr_debug("Ping Data: \"%s\"\n", ping_data);
1926 return iscsit_process_nop_out(conn, cmd, hdr);
1929 iscsit_free_cmd(cmd, false);
1935 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1937 switch (iscsi_tmf) {
1938 case ISCSI_TM_FUNC_ABORT_TASK:
1939 return TMR_ABORT_TASK;
1940 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1941 return TMR_ABORT_TASK_SET;
1942 case ISCSI_TM_FUNC_CLEAR_ACA:
1943 return TMR_CLEAR_ACA;
1944 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1945 return TMR_CLEAR_TASK_SET;
1946 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1947 return TMR_LUN_RESET;
1948 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1949 return TMR_TARGET_WARM_RESET;
1950 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1951 return TMR_TARGET_COLD_RESET;
1958 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1961 struct se_tmr_req *se_tmr;
1962 struct iscsi_tmr_req *tmr_req;
1963 struct iscsi_tm *hdr;
1964 int out_of_order_cmdsn = 0, ret;
1965 bool sess_ref = false;
1966 u8 function, tcm_function = TMR_UNKNOWN;
1968 hdr = (struct iscsi_tm *) buf;
1969 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1970 function = hdr->flags;
1972 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1973 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1974 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1975 hdr->rtt, hdr->refcmdsn, conn->cid);
1977 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1978 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1979 hdr->rtt != RESERVED_ITT)) {
1980 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1981 hdr->rtt = RESERVED_ITT;
1984 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1985 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1986 pr_err("Task Management Request TASK_REASSIGN not"
1987 " issued as immediate command, bad iSCSI Initiator"
1988 "implementation\n");
1989 return iscsit_add_reject_cmd(cmd,
1990 ISCSI_REASON_PROTOCOL_ERROR, buf);
1992 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1993 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1994 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1996 cmd->data_direction = DMA_NONE;
1997 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1999 return iscsit_add_reject_cmd(cmd,
2000 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2004 * TASK_REASSIGN for ERL=2 / connection stays inside of
2005 * LIO-Target $FABRIC_MOD
2007 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2008 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2009 conn->sess->se_sess, 0, DMA_NONE,
2010 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2012 target_get_sess_cmd(&cmd->se_cmd, true);
2014 tcm_function = iscsit_convert_tmf(function);
2015 if (tcm_function == TMR_UNKNOWN) {
2016 pr_err("Unknown iSCSI TMR Function:"
2017 " 0x%02x\n", function);
2018 return iscsit_add_reject_cmd(cmd,
2019 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2022 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2025 return iscsit_add_reject_cmd(cmd,
2026 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2028 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2030 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2031 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2032 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2033 cmd->init_task_tag = hdr->itt;
2034 cmd->targ_xfer_tag = 0xFFFFFFFF;
2035 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2036 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2037 se_tmr = cmd->se_cmd.se_tmr_req;
2038 tmr_req = cmd->tmr_req;
2040 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2042 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2043 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2044 scsilun_to_int(&hdr->lun));
2046 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2052 case ISCSI_TM_FUNC_ABORT_TASK:
2053 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2054 if (se_tmr->response)
2057 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2058 case ISCSI_TM_FUNC_CLEAR_ACA:
2059 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2060 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2062 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2063 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2064 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2068 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2069 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2070 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2074 case ISCSI_TM_FUNC_TASK_REASSIGN:
2075 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2077 * Perform sanity checks on the ExpDataSN only if the
2078 * TASK_REASSIGN was successful.
2080 if (se_tmr->response)
2083 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2084 return iscsit_add_reject_cmd(cmd,
2085 ISCSI_REASON_BOOKMARK_INVALID, buf);
2088 pr_err("Unknown TMR function: 0x%02x, protocol"
2089 " error.\n", function);
2090 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2094 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2095 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2096 se_tmr->call_transport = 1;
2098 spin_lock_bh(&conn->cmd_lock);
2099 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2100 spin_unlock_bh(&conn->cmd_lock);
2102 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2103 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2104 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2105 out_of_order_cmdsn = 1;
2106 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2108 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2111 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2113 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2116 * Found the referenced task, send to transport for processing.
2118 if (se_tmr->call_transport)
2119 return transport_generic_handle_tmr(&cmd->se_cmd);
2122 * Could not find the referenced LUN, task, or Task Management
2123 * command not authorized or supported. Change state and
2124 * let the tx_thread send the response.
2126 * For connection recovery, this is also the default action for
2127 * TMR TASK_REASSIGN.
2130 pr_debug("Handle TMR, using sess_ref=true check\n");
2131 target_put_sess_cmd(&cmd->se_cmd);
2134 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2137 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2139 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2141 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2142 struct iscsi_text *hdr)
2144 u32 payload_length = ntoh24(hdr->dlength);
2146 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2147 pr_err("Unable to accept text parameter length: %u"
2148 "greater than MaxXmitDataSegmentLength %u.\n",
2149 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2150 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2151 (unsigned char *)hdr);
2154 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2155 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2156 pr_err("Multi sequence text commands currently not supported\n");
2157 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2158 (unsigned char *)hdr);
2161 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2162 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2163 hdr->exp_statsn, payload_length);
2165 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2166 cmd->i_state = ISTATE_SEND_TEXTRSP;
2167 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2168 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2169 cmd->targ_xfer_tag = 0xFFFFFFFF;
2170 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2171 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2172 cmd->data_direction = DMA_NONE;
2173 kfree(cmd->text_in_ptr);
2174 cmd->text_in_ptr = NULL;
2178 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2181 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2182 struct iscsi_text *hdr)
2184 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2188 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2189 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2190 pr_err("Unable to locate text_in buffer for sendtargets"
2194 goto empty_sendtargets;
2196 if (strncmp("SendTargets", text_in, 11) != 0) {
2197 pr_err("Received Text Data that is not"
2198 " SendTargets, cannot continue.\n");
2201 text_ptr = strchr(text_in, '=');
2203 pr_err("No \"=\" separator found in Text Data,"
2204 " cannot continue.\n");
2207 if (!strncmp("=All", text_ptr, 4)) {
2208 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2209 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2210 !strncmp("=eui.", text_ptr, 5)) {
2211 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2213 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2217 spin_lock_bh(&conn->cmd_lock);
2218 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2219 spin_unlock_bh(&conn->cmd_lock);
2222 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2224 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2225 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2226 (unsigned char *)hdr, hdr->cmdsn);
2227 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2233 return iscsit_execute_cmd(cmd, 0);
2236 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2237 (unsigned char *)hdr);
2239 EXPORT_SYMBOL(iscsit_process_text_cmd);
2242 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2245 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2246 char *text_in = NULL;
2247 u32 payload_length = ntoh24(hdr->dlength);
2250 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2254 rx_size = payload_length;
2255 if (payload_length) {
2256 u32 checksum = 0, data_crc = 0;
2257 u32 padding = 0, pad_bytes = 0;
2258 int niov = 0, rx_got;
2261 text_in = kzalloc(payload_length, GFP_KERNEL);
2265 cmd->text_in_ptr = text_in;
2267 memset(iov, 0, 3 * sizeof(struct kvec));
2268 iov[niov].iov_base = text_in;
2269 iov[niov++].iov_len = payload_length;
2271 padding = ((-payload_length) & 3);
2273 iov[niov].iov_base = &pad_bytes;
2274 iov[niov++].iov_len = padding;
2276 pr_debug("Receiving %u additional bytes"
2277 " for padding.\n", padding);
2279 if (conn->conn_ops->DataDigest) {
2280 iov[niov].iov_base = &checksum;
2281 iov[niov++].iov_len = ISCSI_CRC_LEN;
2282 rx_size += ISCSI_CRC_LEN;
2285 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2286 if (rx_got != rx_size)
2289 if (conn->conn_ops->DataDigest) {
2290 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2291 text_in, payload_length,
2292 padding, (u8 *)&pad_bytes,
2295 if (checksum != data_crc) {
2296 pr_err("Text data CRC32C DataDigest"
2297 " 0x%08x does not match computed"
2298 " 0x%08x\n", checksum, data_crc);
2299 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2300 pr_err("Unable to recover from"
2301 " Text Data digest failure while in"
2306 * Silently drop this PDU and let the
2307 * initiator plug the CmdSN gap.
2309 pr_debug("Dropping Text"
2310 " Command CmdSN: 0x%08x due to"
2311 " DataCRC error.\n", hdr->cmdsn);
2316 pr_debug("Got CRC32C DataDigest"
2317 " 0x%08x for %u bytes of text data.\n",
2318 checksum, payload_length);
2321 text_in[payload_length - 1] = '\0';
2322 pr_debug("Successfully read %d bytes of text"
2323 " data.\n", payload_length);
2326 return iscsit_process_text_cmd(conn, cmd, hdr);
2329 kfree(cmd->text_in_ptr);
2330 cmd->text_in_ptr = NULL;
2331 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2334 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2336 struct iscsi_conn *conn_p;
2337 struct iscsi_session *sess = conn->sess;
2339 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2340 " for SID: %u.\n", conn->cid, conn->sess->sid);
2342 atomic_set(&sess->session_logout, 1);
2343 atomic_set(&conn->conn_logout_remove, 1);
2344 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2346 iscsit_inc_conn_usage_count(conn);
2347 iscsit_inc_session_usage_count(sess);
2349 spin_lock_bh(&sess->conn_lock);
2350 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2351 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2354 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2355 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2357 spin_unlock_bh(&sess->conn_lock);
2359 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2364 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2366 struct iscsi_conn *l_conn;
2367 struct iscsi_session *sess = conn->sess;
2369 pr_debug("Received logout request CLOSECONNECTION for CID:"
2370 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2373 * A Logout Request with a CLOSECONNECTION reason code for a CID
2374 * can arrive on a connection with a differing CID.
2376 if (conn->cid == cmd->logout_cid) {
2377 spin_lock_bh(&conn->state_lock);
2378 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2379 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2381 atomic_set(&conn->conn_logout_remove, 1);
2382 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2383 iscsit_inc_conn_usage_count(conn);
2385 spin_unlock_bh(&conn->state_lock);
2388 * Handle all different cid CLOSECONNECTION requests in
2389 * iscsit_logout_post_handler_diffcid() as to give enough
2390 * time for any non immediate command's CmdSN to be
2391 * acknowledged on the connection in question.
2393 * Here we simply make sure the CID is still around.
2395 l_conn = iscsit_get_conn_from_cid(sess,
2398 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2399 iscsit_add_cmd_to_response_queue(cmd, conn,
2404 iscsit_dec_conn_usage_count(l_conn);
2407 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2412 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2414 struct iscsi_session *sess = conn->sess;
2416 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2417 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2419 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2420 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2421 " while ERL!=2.\n");
2422 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2423 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2427 if (conn->cid == cmd->logout_cid) {
2428 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2429 " with CID: %hu on CID: %hu, implementation error.\n",
2430 cmd->logout_cid, conn->cid);
2431 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2436 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2442 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2445 int cmdsn_ret, logout_remove = 0;
2447 struct iscsi_logout *hdr;
2448 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2450 hdr = (struct iscsi_logout *) buf;
2451 reason_code = (hdr->flags & 0x7f);
2454 spin_lock(&tiqn->logout_stats.lock);
2455 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2456 tiqn->logout_stats.normal_logouts++;
2458 tiqn->logout_stats.abnormal_logouts++;
2459 spin_unlock(&tiqn->logout_stats.lock);
2462 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2463 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2464 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2465 hdr->cid, conn->cid);
2467 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2468 pr_err("Received logout request on connection that"
2469 " is not in logged in state, ignoring request.\n");
2470 iscsit_free_cmd(cmd, false);
2474 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2475 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2476 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2477 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2478 cmd->targ_xfer_tag = 0xFFFFFFFF;
2479 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2480 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2481 cmd->logout_cid = be16_to_cpu(hdr->cid);
2482 cmd->logout_reason = reason_code;
2483 cmd->data_direction = DMA_NONE;
2486 * We need to sleep in these cases (by returning 1) until the Logout
2487 * Response gets sent in the tx thread.
2489 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2490 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2491 be16_to_cpu(hdr->cid) == conn->cid))
2494 spin_lock_bh(&conn->cmd_lock);
2495 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2496 spin_unlock_bh(&conn->cmd_lock);
2498 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2499 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2502 * Immediate commands are executed, well, immediately.
2503 * Non-Immediate Logout Commands are executed in CmdSN order.
2505 if (cmd->immediate_cmd) {
2506 int ret = iscsit_execute_cmd(cmd, 0);
2511 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2512 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2514 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2518 return logout_remove;
2520 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2522 int iscsit_handle_snack(
2523 struct iscsi_conn *conn,
2526 struct iscsi_snack *hdr;
2528 hdr = (struct iscsi_snack *) buf;
2529 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2531 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2532 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2533 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2534 hdr->begrun, hdr->runlength, conn->cid);
2536 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2537 pr_err("Initiator sent SNACK request while in"
2538 " ErrorRecoveryLevel=0.\n");
2539 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2543 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2544 * call from inside iscsi_send_recovery_datain_or_r2t().
2546 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2548 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2550 be32_to_cpu(hdr->ttt),
2551 be32_to_cpu(hdr->begrun),
2552 be32_to_cpu(hdr->runlength));
2553 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2554 return iscsit_handle_status_snack(conn, hdr->itt,
2555 be32_to_cpu(hdr->ttt),
2556 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2557 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2558 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2559 be32_to_cpu(hdr->begrun),
2560 be32_to_cpu(hdr->runlength));
2561 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2562 /* FIXME: Support R-Data SNACK */
2563 pr_err("R-Data SNACK Not Supported.\n");
2564 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2567 pr_err("Unknown SNACK type 0x%02x, protocol"
2568 " error.\n", hdr->flags & 0x0f);
2569 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2575 EXPORT_SYMBOL(iscsit_handle_snack);
2577 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2579 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2580 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2581 wait_for_completion_interruptible_timeout(
2582 &conn->rx_half_close_comp,
2583 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2587 static int iscsit_handle_immediate_data(
2588 struct iscsi_cmd *cmd,
2589 struct iscsi_scsi_req *hdr,
2592 int iov_ret, rx_got = 0, rx_size = 0;
2593 u32 checksum, iov_count = 0, padding = 0;
2594 struct iscsi_conn *conn = cmd->conn;
2597 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2599 return IMMEDIATE_DATA_CANNOT_RECOVER;
2602 iov_count = iov_ret;
2603 iov = &cmd->iov_data[0];
2605 padding = ((-length) & 3);
2607 iov[iov_count].iov_base = cmd->pad_bytes;
2608 iov[iov_count++].iov_len = padding;
2612 if (conn->conn_ops->DataDigest) {
2613 iov[iov_count].iov_base = &checksum;
2614 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2615 rx_size += ISCSI_CRC_LEN;
2618 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2620 iscsit_unmap_iovec(cmd);
2622 if (rx_got != rx_size) {
2623 iscsit_rx_thread_wait_for_tcp(conn);
2624 return IMMEDIATE_DATA_CANNOT_RECOVER;
2627 if (conn->conn_ops->DataDigest) {
2630 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2631 cmd->write_data_done, length, padding,
2634 if (checksum != data_crc) {
2635 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2636 " does not match computed 0x%08x\n", checksum,
2639 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2640 pr_err("Unable to recover from"
2641 " Immediate Data digest failure while"
2643 iscsit_reject_cmd(cmd,
2644 ISCSI_REASON_DATA_DIGEST_ERROR,
2645 (unsigned char *)hdr);
2646 return IMMEDIATE_DATA_CANNOT_RECOVER;
2648 iscsit_reject_cmd(cmd,
2649 ISCSI_REASON_DATA_DIGEST_ERROR,
2650 (unsigned char *)hdr);
2651 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2654 pr_debug("Got CRC32C DataDigest 0x%08x for"
2655 " %u bytes of Immediate Data\n", checksum,
2660 cmd->write_data_done += length;
2662 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2663 spin_lock_bh(&cmd->istate_lock);
2664 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2665 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2666 spin_unlock_bh(&cmd->istate_lock);
2669 return IMMEDIATE_DATA_NORMAL_OPERATION;
2673 * Called with sess->conn_lock held.
2675 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2676 with active network interface */
2677 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2679 struct iscsi_cmd *cmd;
2680 struct iscsi_conn *conn_p;
2684 * Only send a Asynchronous Message on connections whos network
2685 * interface is still functional.
2687 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2688 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2689 iscsit_inc_conn_usage_count(conn_p);
2698 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2700 iscsit_dec_conn_usage_count(conn_p);
2704 cmd->logout_cid = conn->cid;
2705 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2706 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2708 spin_lock_bh(&conn_p->cmd_lock);
2709 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2710 spin_unlock_bh(&conn_p->cmd_lock);
2712 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2713 iscsit_dec_conn_usage_count(conn_p);
2716 static int iscsit_send_conn_drop_async_message(
2717 struct iscsi_cmd *cmd,
2718 struct iscsi_conn *conn)
2720 struct iscsi_async *hdr;
2722 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2724 hdr = (struct iscsi_async *) cmd->pdu;
2725 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2726 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2727 cmd->init_task_tag = RESERVED_ITT;
2728 cmd->targ_xfer_tag = 0xFFFFFFFF;
2729 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2730 cmd->stat_sn = conn->stat_sn++;
2731 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2732 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2733 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2734 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2735 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2736 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2737 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2739 pr_debug("Sending Connection Dropped Async Message StatSN:"
2740 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2741 cmd->logout_cid, conn->cid);
2743 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2746 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2748 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2749 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2750 wait_for_completion_interruptible_timeout(
2751 &conn->tx_half_close_comp,
2752 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2757 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2758 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2761 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2762 hdr->flags = datain->flags;
2763 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2764 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2765 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2766 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2767 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2768 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2769 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2772 hton24(hdr->dlength, datain->length);
2773 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2774 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2775 (struct scsi_lun *)&hdr->lun);
2777 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2779 hdr->itt = cmd->init_task_tag;
2781 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2782 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2784 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2786 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2788 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2790 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2791 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2792 hdr->datasn = cpu_to_be32(datain->data_sn);
2793 hdr->offset = cpu_to_be32(datain->offset);
2795 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2796 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2797 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2798 ntohl(hdr->offset), datain->length, conn->cid);
2800 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2802 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2804 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2805 struct iscsi_datain datain;
2806 struct iscsi_datain_req *dr;
2808 bool set_statsn = false;
2810 memset(&datain, 0, sizeof(struct iscsi_datain));
2811 dr = iscsit_get_datain_values(cmd, &datain);
2813 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2814 cmd->init_task_tag);
2818 * Be paranoid and double check the logic for now.
2820 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2821 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2822 " datain.length: %u exceeds cmd->data_length: %u\n",
2823 cmd->init_task_tag, datain.offset, datain.length,
2824 cmd->se_cmd.data_length);
2828 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2830 * Special case for successfully execution w/ both DATAIN
2833 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2834 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2835 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2837 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2838 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2839 iscsit_increment_maxcmdsn(cmd, conn->sess);
2840 cmd->stat_sn = conn->stat_sn++;
2842 } else if (dr->dr_complete ==
2843 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2847 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2849 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2853 if (dr->dr_complete) {
2854 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2856 iscsit_free_datain_req(cmd, dr);
2863 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2864 struct iscsi_logout_rsp *hdr)
2866 struct iscsi_conn *logout_conn = NULL;
2867 struct iscsi_conn_recovery *cr = NULL;
2868 struct iscsi_session *sess = conn->sess;
2870 * The actual shutting down of Sessions and/or Connections
2871 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2872 * is done in scsi_logout_post_handler().
2874 switch (cmd->logout_reason) {
2875 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2876 pr_debug("iSCSI session logout successful, setting"
2877 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2878 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2880 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2881 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2884 * For CLOSECONNECTION logout requests carrying
2885 * a matching logout CID -> local CID, the reference
2886 * for the local CID will have been incremented in
2887 * iscsi_logout_closeconnection().
2889 * For CLOSECONNECTION logout requests carrying
2890 * a different CID than the connection it arrived
2891 * on, the connection responding to cmd->logout_cid
2892 * is stopped in iscsit_logout_post_handler_diffcid().
2895 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2896 " successful.\n", cmd->logout_cid, conn->cid);
2897 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2899 case ISCSI_LOGOUT_REASON_RECOVERY:
2900 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2901 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2904 * If the connection is still active from our point of view
2905 * force connection recovery to occur.
2907 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2910 iscsit_connection_reinstatement_rcfr(logout_conn);
2911 iscsit_dec_conn_usage_count(logout_conn);
2914 cr = iscsit_get_inactive_connection_recovery_entry(
2915 conn->sess, cmd->logout_cid);
2917 pr_err("Unable to locate CID: %hu for"
2918 " REMOVECONNFORRECOVERY Logout Request.\n",
2920 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2924 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2926 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2927 " for recovery for CID: %hu on CID: %hu successful.\n",
2928 cmd->logout_cid, conn->cid);
2929 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2932 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2933 cmd->logout_reason);
2937 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2938 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2939 hdr->response = cmd->logout_response;
2940 hdr->itt = cmd->init_task_tag;
2941 cmd->stat_sn = conn->stat_sn++;
2942 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2944 iscsit_increment_maxcmdsn(cmd, conn->sess);
2945 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2946 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2948 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2949 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2950 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2951 cmd->logout_cid, conn->cid);
2955 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2958 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2962 rc = iscsit_build_logout_rsp(cmd, conn,
2963 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2967 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2971 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2972 struct iscsi_nopin *hdr, bool nopout_response)
2974 hdr->opcode = ISCSI_OP_NOOP_IN;
2975 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2976 hton24(hdr->dlength, cmd->buf_ptr_size);
2977 if (nopout_response)
2978 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2979 hdr->itt = cmd->init_task_tag;
2980 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2981 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2983 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2985 if (nopout_response)
2986 iscsit_increment_maxcmdsn(cmd, conn->sess);
2988 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2989 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2991 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2992 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2993 "Solicited" : "Unsolicited", cmd->init_task_tag,
2994 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2996 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2999 * Unsolicited NOPIN, either requesting a response or not.
3001 static int iscsit_send_unsolicited_nopin(
3002 struct iscsi_cmd *cmd,
3003 struct iscsi_conn *conn,
3006 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3009 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3011 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3012 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3014 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3018 spin_lock_bh(&cmd->istate_lock);
3019 cmd->i_state = want_response ?
3020 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3021 spin_unlock_bh(&cmd->istate_lock);
3027 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3029 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3031 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3034 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3035 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3037 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3039 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3044 static int iscsit_send_r2t(
3045 struct iscsi_cmd *cmd,
3046 struct iscsi_conn *conn)
3048 struct iscsi_r2t *r2t;
3049 struct iscsi_r2t_rsp *hdr;
3052 r2t = iscsit_get_r2t_from_list(cmd);
3056 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3057 memset(hdr, 0, ISCSI_HDR_LEN);
3058 hdr->opcode = ISCSI_OP_R2T;
3059 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3060 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3061 (struct scsi_lun *)&hdr->lun);
3062 hdr->itt = cmd->init_task_tag;
3063 if (conn->conn_transport->iscsit_get_r2t_ttt)
3064 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3066 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3067 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3068 hdr->statsn = cpu_to_be32(conn->stat_sn);
3069 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3070 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3071 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3072 hdr->data_offset = cpu_to_be32(r2t->offset);
3073 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3075 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3076 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3077 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3078 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3079 r2t->offset, r2t->xfer_len, conn->cid);
3081 spin_lock_bh(&cmd->r2t_lock);
3083 spin_unlock_bh(&cmd->r2t_lock);
3085 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3090 spin_lock_bh(&cmd->dataout_timeout_lock);
3091 iscsit_start_dataout_timer(cmd, conn);
3092 spin_unlock_bh(&cmd->dataout_timeout_lock);
3098 * @recovery: If called from iscsi_task_reassign_complete_write() for
3099 * connection recovery.
3101 int iscsit_build_r2ts_for_cmd(
3102 struct iscsi_conn *conn,
3103 struct iscsi_cmd *cmd,
3107 u32 offset = 0, xfer_len = 0;
3109 spin_lock_bh(&cmd->r2t_lock);
3110 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3111 spin_unlock_bh(&cmd->r2t_lock);
3115 if (conn->sess->sess_ops->DataSequenceInOrder &&
3117 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3119 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3120 if (conn->sess->sess_ops->DataSequenceInOrder) {
3121 offset = cmd->r2t_offset;
3123 if (first_r2t && recovery) {
3124 int new_data_end = offset +
3125 conn->sess->sess_ops->MaxBurstLength -
3126 cmd->next_burst_len;
3128 if (new_data_end > cmd->se_cmd.data_length)
3129 xfer_len = cmd->se_cmd.data_length - offset;
3132 conn->sess->sess_ops->MaxBurstLength -
3133 cmd->next_burst_len;
3135 int new_data_end = offset +
3136 conn->sess->sess_ops->MaxBurstLength;
3138 if (new_data_end > cmd->se_cmd.data_length)
3139 xfer_len = cmd->se_cmd.data_length - offset;
3141 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3143 cmd->r2t_offset += xfer_len;
3145 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3146 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3148 struct iscsi_seq *seq;
3150 seq = iscsit_get_seq_holder_for_r2t(cmd);
3152 spin_unlock_bh(&cmd->r2t_lock);
3156 offset = seq->offset;
3157 xfer_len = seq->xfer_len;
3159 if (cmd->seq_send_order == cmd->seq_count)
3160 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3162 cmd->outstanding_r2ts++;
3165 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3166 spin_unlock_bh(&cmd->r2t_lock);
3170 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3173 spin_unlock_bh(&cmd->r2t_lock);
3177 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3179 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3180 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3183 cmd->stat_sn = conn->stat_sn++;
3185 atomic_long_inc(&conn->sess->rsp_pdus);
3187 memset(hdr, 0, ISCSI_HDR_LEN);
3188 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3189 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3190 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3191 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3192 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3193 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3194 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3195 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3197 hdr->response = cmd->iscsi_response;
3198 hdr->cmd_status = cmd->se_cmd.scsi_status;
3199 hdr->itt = cmd->init_task_tag;
3200 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3202 iscsit_increment_maxcmdsn(cmd, conn->sess);
3203 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3204 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3206 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3207 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3208 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3209 cmd->se_cmd.scsi_status, conn->cid);
3211 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3213 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3215 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3216 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3217 void *data_buf = NULL;
3218 u32 padding = 0, data_buf_len = 0;
3220 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3223 * Attach SENSE DATA payload to iSCSI Response PDU
3225 if (cmd->se_cmd.sense_buffer &&
3226 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3227 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3228 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3229 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3231 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3232 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3233 data_buf = cmd->sense_buffer;
3234 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3237 memset(cmd->sense_buffer +
3238 cmd->se_cmd.scsi_sense_length, 0, padding);
3239 pr_debug("Adding %u bytes of padding to"
3240 " SENSE.\n", padding);
3243 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3245 cmd->se_cmd.scsi_sense_length);
3248 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3252 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3254 switch (se_tmr->response) {
3255 case TMR_FUNCTION_COMPLETE:
3256 return ISCSI_TMF_RSP_COMPLETE;
3257 case TMR_TASK_DOES_NOT_EXIST:
3258 return ISCSI_TMF_RSP_NO_TASK;
3259 case TMR_LUN_DOES_NOT_EXIST:
3260 return ISCSI_TMF_RSP_NO_LUN;
3261 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3262 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3263 case TMR_FUNCTION_REJECTED:
3265 return ISCSI_TMF_RSP_REJECTED;
3270 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3271 struct iscsi_tm_rsp *hdr)
3273 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3275 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3276 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3277 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3278 hdr->itt = cmd->init_task_tag;
3279 cmd->stat_sn = conn->stat_sn++;
3280 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3282 iscsit_increment_maxcmdsn(cmd, conn->sess);
3283 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3284 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3286 pr_debug("Built Task Management Response ITT: 0x%08x,"
3287 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3288 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3290 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3293 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3295 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3297 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3299 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3302 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3306 if (np->np_sockaddr.ss_family == AF_INET6) {
3307 const struct sockaddr_in6 sin6 = {
3308 .sin6_addr = IN6ADDR_ANY_INIT };
3309 struct sockaddr_in6 *sock_in6 =
3310 (struct sockaddr_in6 *)&np->np_sockaddr;
3312 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3313 sin6.sin6_addr.s6_addr, 16))
3316 struct sockaddr_in * sock_in =
3317 (struct sockaddr_in *)&np->np_sockaddr;
3319 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3326 #define SENDTARGETS_BUF_LIMIT 32768U
3329 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3330 enum iscsit_transport_type network_transport,
3331 int skip_bytes, bool *completed)
3333 char *payload = NULL;
3334 struct iscsi_conn *conn = cmd->conn;
3335 struct iscsi_portal_group *tpg;
3336 struct iscsi_tiqn *tiqn;
3337 struct iscsi_tpg_np *tpg_np;
3338 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3339 int target_name_printed;
3340 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3341 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3344 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3345 SENDTARGETS_BUF_LIMIT);
3347 payload = kzalloc(buffer_len, GFP_KERNEL);
3352 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3355 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3356 text_ptr = strchr(text_in, '=');
3358 pr_err("Unable to locate '=' string in text_in:"
3364 * Skip over '=' character..
3369 spin_lock(&tiqn_lock);
3370 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3371 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3372 strcmp(tiqn->tiqn, text_ptr)) {
3376 target_name_printed = 0;
3378 spin_lock(&tiqn->tiqn_tpg_lock);
3379 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3381 /* If demo_mode_discovery=0 and generate_node_acls=0
3382 * (demo mode dislabed) do not return
3383 * TargetName+TargetAddress unless a NodeACL exists.
3386 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3387 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3388 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3389 cmd->conn->sess->sess_ops->InitiatorName))) {
3393 spin_lock(&tpg->tpg_state_lock);
3394 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3395 spin_unlock(&tpg->tpg_state_lock);
3397 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3400 spin_lock(&tpg->tpg_np_lock);
3401 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3403 struct iscsi_np *np = tpg_np->tpg_np;
3404 bool inaddr_any = iscsit_check_inaddr_any(np);
3405 struct sockaddr_storage *sockaddr;
3407 if (np->np_network_transport != network_transport)
3410 if (!target_name_printed) {
3411 len = sprintf(buf, "TargetName=%s",
3415 if ((len + payload_len) > buffer_len) {
3416 spin_unlock(&tpg->tpg_np_lock);
3417 spin_unlock(&tiqn->tiqn_tpg_lock);
3422 if (skip_bytes && len <= skip_bytes) {
3425 memcpy(payload + payload_len, buf, len);
3427 target_name_printed = 1;
3428 if (len > skip_bytes)
3434 sockaddr = &conn->local_sockaddr;
3436 sockaddr = &np->np_sockaddr;
3438 len = sprintf(buf, "TargetAddress="
3444 if ((len + payload_len) > buffer_len) {
3445 spin_unlock(&tpg->tpg_np_lock);
3446 spin_unlock(&tiqn->tiqn_tpg_lock);
3451 if (skip_bytes && len <= skip_bytes) {
3454 memcpy(payload + payload_len, buf, len);
3456 if (len > skip_bytes)
3460 spin_unlock(&tpg->tpg_np_lock);
3462 spin_unlock(&tiqn->tiqn_tpg_lock);
3469 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3472 spin_unlock(&tiqn_lock);
3474 cmd->buf_ptr = payload;
3480 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3481 struct iscsi_text_rsp *hdr,
3482 enum iscsit_transport_type network_transport)
3484 int text_length, padding;
3485 bool completed = true;
3487 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3488 cmd->read_data_done,
3490 if (text_length < 0)
3494 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3496 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3497 cmd->read_data_done += text_length;
3498 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3499 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3501 hdr->opcode = ISCSI_OP_TEXT_RSP;
3502 padding = ((-text_length) & 3);
3503 hton24(hdr->dlength, text_length);
3504 hdr->itt = cmd->init_task_tag;
3505 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3506 cmd->stat_sn = conn->stat_sn++;
3507 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3509 iscsit_increment_maxcmdsn(cmd, conn->sess);
3511 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3512 * correctly increment MaxCmdSN for each response answering a
3513 * non immediate text request with a valid CmdSN.
3515 cmd->maxcmdsn_inc = 0;
3516 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3517 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3519 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3520 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3521 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3522 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3523 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3525 return text_length + padding;
3527 EXPORT_SYMBOL(iscsit_build_text_rsp);
3529 static int iscsit_send_text_rsp(
3530 struct iscsi_cmd *cmd,
3531 struct iscsi_conn *conn)
3533 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3536 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3537 conn->conn_transport->transport_type);
3538 if (text_length < 0)
3541 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3547 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3548 struct iscsi_reject *hdr)
3550 hdr->opcode = ISCSI_OP_REJECT;
3551 hdr->reason = cmd->reject_reason;
3552 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3553 hton24(hdr->dlength, ISCSI_HDR_LEN);
3554 hdr->ffffffff = cpu_to_be32(0xffffffff);
3555 cmd->stat_sn = conn->stat_sn++;
3556 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3557 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3558 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3561 EXPORT_SYMBOL(iscsit_build_reject);
3563 static int iscsit_send_reject(
3564 struct iscsi_cmd *cmd,
3565 struct iscsi_conn *conn)
3567 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3569 iscsit_build_reject(cmd, conn, hdr);
3571 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3572 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3574 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3579 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3583 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3584 * within iscsit_start_kthreads()
3586 * Here we use bitmap_id to determine which CPU that this
3587 * iSCSI connection's RX/TX threads will be scheduled to
3590 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3591 for_each_online_cpu(cpu) {
3593 cpumask_set_cpu(cpu, conn->conn_cpumask);
3598 * This should never be reached..
3601 cpumask_setall(conn->conn_cpumask);
3605 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3610 case ISTATE_SEND_R2T:
3611 ret = iscsit_send_r2t(cmd, conn);
3616 spin_lock_bh(&conn->cmd_lock);
3617 list_del_init(&cmd->i_conn_node);
3618 spin_unlock_bh(&conn->cmd_lock);
3620 iscsit_free_cmd(cmd, false);
3622 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3623 iscsit_mod_nopin_response_timer(conn);
3624 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3628 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3629 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3634 pr_err("Unknown Opcode: 0x%02x ITT:"
3635 " 0x%08x, i_state: %d on CID: %hu\n",
3636 cmd->iscsi_opcode, cmd->init_task_tag, state,
3646 EXPORT_SYMBOL(iscsit_immediate_queue);
3649 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3651 struct iscsit_transport *t = conn->conn_transport;
3652 struct iscsi_queue_req *qr;
3653 struct iscsi_cmd *cmd;
3657 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3658 atomic_set(&conn->check_immediate_queue, 0);
3661 kmem_cache_free(lio_qr_cache, qr);
3663 ret = t->iscsit_immediate_queue(conn, cmd, state);
3672 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3678 case ISTATE_SEND_DATAIN:
3679 ret = iscsit_send_datain(cmd, conn);
3684 goto check_rsp_state;
3685 else if (ret == 1) {
3687 spin_lock_bh(&cmd->istate_lock);
3688 cmd->i_state = ISTATE_SENT_STATUS;
3689 spin_unlock_bh(&cmd->istate_lock);
3691 if (atomic_read(&conn->check_immediate_queue))
3695 } else if (ret == 2) {
3696 /* Still must send status,
3697 SCF_TRANSPORT_TASK_SENSE was set */
3698 spin_lock_bh(&cmd->istate_lock);
3699 cmd->i_state = ISTATE_SEND_STATUS;
3700 spin_unlock_bh(&cmd->istate_lock);
3701 state = ISTATE_SEND_STATUS;
3702 goto check_rsp_state;
3706 case ISTATE_SEND_STATUS:
3707 case ISTATE_SEND_STATUS_RECOVERY:
3708 ret = iscsit_send_response(cmd, conn);
3710 case ISTATE_SEND_LOGOUTRSP:
3711 ret = iscsit_send_logout(cmd, conn);
3713 case ISTATE_SEND_ASYNCMSG:
3714 ret = iscsit_send_conn_drop_async_message(
3717 case ISTATE_SEND_NOPIN:
3718 ret = iscsit_send_nopin(cmd, conn);
3720 case ISTATE_SEND_REJECT:
3721 ret = iscsit_send_reject(cmd, conn);
3723 case ISTATE_SEND_TASKMGTRSP:
3724 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3727 ret = iscsit_tmr_post_handler(cmd, conn);
3729 iscsit_fall_back_to_erl0(conn->sess);
3731 case ISTATE_SEND_TEXTRSP:
3732 ret = iscsit_send_text_rsp(cmd, conn);
3735 pr_err("Unknown Opcode: 0x%02x ITT:"
3736 " 0x%08x, i_state: %d on CID: %hu\n",
3737 cmd->iscsi_opcode, cmd->init_task_tag,
3745 case ISTATE_SEND_LOGOUTRSP:
3746 if (!iscsit_logout_post_handler(cmd, conn))
3749 case ISTATE_SEND_STATUS:
3750 case ISTATE_SEND_ASYNCMSG:
3751 case ISTATE_SEND_NOPIN:
3752 case ISTATE_SEND_STATUS_RECOVERY:
3753 case ISTATE_SEND_TEXTRSP:
3754 case ISTATE_SEND_TASKMGTRSP:
3755 case ISTATE_SEND_REJECT:
3756 spin_lock_bh(&cmd->istate_lock);
3757 cmd->i_state = ISTATE_SENT_STATUS;
3758 spin_unlock_bh(&cmd->istate_lock);
3761 pr_err("Unknown Opcode: 0x%02x ITT:"
3762 " 0x%08x, i_state: %d on CID: %hu\n",
3763 cmd->iscsi_opcode, cmd->init_task_tag,
3764 cmd->i_state, conn->cid);
3768 if (atomic_read(&conn->check_immediate_queue))
3776 EXPORT_SYMBOL(iscsit_response_queue);
3778 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3780 struct iscsit_transport *t = conn->conn_transport;
3781 struct iscsi_queue_req *qr;
3782 struct iscsi_cmd *cmd;
3786 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3789 kmem_cache_free(lio_qr_cache, qr);
3791 ret = t->iscsit_response_queue(conn, cmd, state);
3792 if (ret == 1 || ret < 0)
3799 int iscsi_target_tx_thread(void *arg)
3802 struct iscsi_conn *conn = arg;
3803 bool conn_freed = false;
3806 * Allow ourselves to be interrupted by SIGINT so that a
3807 * connection recovery / failure event can be triggered externally.
3809 allow_signal(SIGINT);
3811 while (!kthread_should_stop()) {
3813 * Ensure that both TX and RX per connection kthreads
3814 * are scheduled to run on the same CPU.
3816 iscsit_thread_check_cpumask(conn, current, 1);
3818 wait_event_interruptible(conn->queues_wq,
3819 !iscsit_conn_all_queues_empty(conn));
3821 if (signal_pending(current))
3825 ret = iscsit_handle_immediate_queue(conn);
3829 ret = iscsit_handle_response_queue(conn);
3832 } else if (ret == -ECONNRESET) {
3835 } else if (ret < 0) {
3842 * Avoid the normal connection failure code-path if this connection
3843 * is still within LOGIN mode, and iscsi_np process context is
3844 * responsible for cleaning up the early connection failure.
3846 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3847 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3850 while (!kthread_should_stop()) {
3857 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3859 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3860 struct iscsi_cmd *cmd;
3863 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3864 case ISCSI_OP_SCSI_CMD:
3865 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3869 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3871 case ISCSI_OP_SCSI_DATA_OUT:
3872 ret = iscsit_handle_data_out(conn, buf);
3874 case ISCSI_OP_NOOP_OUT:
3876 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3877 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3881 ret = iscsit_handle_nop_out(conn, cmd, buf);
3883 case ISCSI_OP_SCSI_TMFUNC:
3884 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3888 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3891 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3892 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3896 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3901 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3903 case ISCSI_OP_LOGOUT:
3904 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3908 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3910 wait_for_completion_timeout(&conn->conn_logout_comp,
3911 SECONDS_FOR_LOGOUT_COMP * HZ);
3913 case ISCSI_OP_SNACK:
3914 ret = iscsit_handle_snack(conn, buf);
3917 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3918 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3919 pr_err("Cannot recover from unknown"
3920 " opcode while ERL=0, closing iSCSI connection.\n");
3923 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3924 " closing iSCSI connection.\n");
3931 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3934 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3938 spin_lock_bh(&conn->state_lock);
3939 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3940 spin_unlock_bh(&conn->state_lock);
3945 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3948 u8 buffer[ISCSI_HDR_LEN], opcode;
3949 u32 checksum = 0, digest = 0;
3952 while (!kthread_should_stop()) {
3954 * Ensure that both TX and RX per connection kthreads
3955 * are scheduled to run on the same CPU.
3957 iscsit_thread_check_cpumask(conn, current, 0);
3959 memset(buffer, 0, ISCSI_HDR_LEN);
3960 memset(&iov, 0, sizeof(struct kvec));
3962 iov.iov_base = buffer;
3963 iov.iov_len = ISCSI_HDR_LEN;
3965 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3966 if (ret != ISCSI_HDR_LEN) {
3967 iscsit_rx_thread_wait_for_tcp(conn);
3971 if (conn->conn_ops->HeaderDigest) {
3972 iov.iov_base = &digest;
3973 iov.iov_len = ISCSI_CRC_LEN;
3975 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3976 if (ret != ISCSI_CRC_LEN) {
3977 iscsit_rx_thread_wait_for_tcp(conn);
3981 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3982 buffer, ISCSI_HDR_LEN,
3983 0, NULL, (u8 *)&checksum);
3985 if (digest != checksum) {
3986 pr_err("HeaderDigest CRC32C failed,"
3987 " received 0x%08x, computed 0x%08x\n",
3990 * Set the PDU to 0xff so it will intentionally
3991 * hit default in the switch below.
3993 memset(buffer, 0xff, ISCSI_HDR_LEN);
3994 atomic_long_inc(&conn->sess->conn_digest_errors);
3996 pr_debug("Got HeaderDigest CRC32C"
3997 " 0x%08x\n", checksum);
4001 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4004 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4006 if (conn->sess->sess_ops->SessionType &&
4007 ((!(opcode & ISCSI_OP_TEXT)) ||
4008 (!(opcode & ISCSI_OP_LOGOUT)))) {
4009 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4010 " while in Discovery Session, rejecting.\n", opcode);
4011 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4016 ret = iscsi_target_rx_opcode(conn, buffer);
4022 int iscsi_target_rx_thread(void *arg)
4025 struct iscsi_conn *conn = arg;
4026 bool conn_freed = false;
4029 * Allow ourselves to be interrupted by SIGINT so that a
4030 * connection recovery / failure event can be triggered externally.
4032 allow_signal(SIGINT);
4034 * Wait for iscsi_post_login_handler() to complete before allowing
4035 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4037 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4038 if (rc < 0 || iscsi_target_check_conn_state(conn))
4041 if (!conn->conn_transport->iscsit_get_rx_pdu)
4044 conn->conn_transport->iscsit_get_rx_pdu(conn);
4046 if (!signal_pending(current))
4047 atomic_set(&conn->transport_failed, 1);
4048 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4052 while (!kthread_should_stop()) {
4060 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4062 LIST_HEAD(tmp_list);
4063 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4064 struct iscsi_session *sess = conn->sess;
4066 * We expect this function to only ever be called from either RX or TX
4067 * thread context via iscsit_close_connection() once the other context
4068 * has been reset -> returned sleeping pre-handler state.
4070 spin_lock_bh(&conn->cmd_lock);
4071 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4073 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4074 struct se_cmd *se_cmd = &cmd->se_cmd;
4076 if (se_cmd->se_tfo != NULL) {
4077 spin_lock(&se_cmd->t_state_lock);
4078 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4079 spin_unlock(&se_cmd->t_state_lock);
4082 spin_unlock_bh(&conn->cmd_lock);
4084 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4085 list_del_init(&cmd->i_conn_node);
4087 iscsit_increment_maxcmdsn(cmd, sess);
4088 iscsit_free_cmd(cmd, true);
4093 static void iscsit_stop_timers_for_cmds(
4094 struct iscsi_conn *conn)
4096 struct iscsi_cmd *cmd;
4098 spin_lock_bh(&conn->cmd_lock);
4099 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4100 if (cmd->data_direction == DMA_TO_DEVICE)
4101 iscsit_stop_dataout_timer(cmd);
4103 spin_unlock_bh(&conn->cmd_lock);
4106 int iscsit_close_connection(
4107 struct iscsi_conn *conn)
4109 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4110 struct iscsi_session *sess = conn->sess;
4112 pr_debug("Closing iSCSI connection CID %hu on SID:"
4113 " %u\n", conn->cid, sess->sid);
4115 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4116 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4117 * sleeping and the logout response never got sent because the
4118 * connection failed.
4120 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4121 * to signal logout response TX interrupt completion. Go ahead and skip
4122 * this for iser since isert_rx_opcode() does not wait on logout failure,
4123 * and to avoid iscsi_conn pointer dereference in iser-target code.
4125 if (!conn->conn_transport->rdma_shutdown)
4126 complete(&conn->conn_logout_comp);
4128 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4129 if (conn->tx_thread &&
4130 cmpxchg(&conn->tx_thread_active, true, false)) {
4131 send_sig(SIGINT, conn->tx_thread, 1);
4132 kthread_stop(conn->tx_thread);
4134 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4135 if (conn->rx_thread &&
4136 cmpxchg(&conn->rx_thread_active, true, false)) {
4137 send_sig(SIGINT, conn->rx_thread, 1);
4138 kthread_stop(conn->rx_thread);
4142 spin_lock(&iscsit_global->ts_bitmap_lock);
4143 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4145 spin_unlock(&iscsit_global->ts_bitmap_lock);
4147 iscsit_stop_timers_for_cmds(conn);
4148 iscsit_stop_nopin_response_timer(conn);
4149 iscsit_stop_nopin_timer(conn);
4151 if (conn->conn_transport->iscsit_wait_conn)
4152 conn->conn_transport->iscsit_wait_conn(conn);
4155 * During Connection recovery drop unacknowledged out of order
4156 * commands for this connection, and prepare the other commands
4159 * During normal operation clear the out of order commands (but
4160 * do not free the struct iscsi_ooo_cmdsn's) and release all
4161 * struct iscsi_cmds.
4163 if (atomic_read(&conn->connection_recovery)) {
4164 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4165 iscsit_prepare_cmds_for_reallegiance(conn);
4167 iscsit_clear_ooo_cmdsns_for_conn(conn);
4168 iscsit_release_commands_from_conn(conn);
4170 iscsit_free_queue_reqs_for_conn(conn);
4173 * Handle decrementing session or connection usage count if
4174 * a logout response was not able to be sent because the
4175 * connection failed. Fall back to Session Recovery here.
4177 if (atomic_read(&conn->conn_logout_remove)) {
4178 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4179 iscsit_dec_conn_usage_count(conn);
4180 iscsit_dec_session_usage_count(sess);
4182 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4183 iscsit_dec_conn_usage_count(conn);
4185 atomic_set(&conn->conn_logout_remove, 0);
4186 atomic_set(&sess->session_reinstatement, 0);
4187 atomic_set(&sess->session_fall_back_to_erl0, 1);
4190 spin_lock_bh(&sess->conn_lock);
4191 list_del(&conn->conn_list);
4194 * Attempt to let the Initiator know this connection failed by
4195 * sending an Connection Dropped Async Message on another
4196 * active connection.
4198 if (atomic_read(&conn->connection_recovery))
4199 iscsit_build_conn_drop_async_message(conn);
4201 spin_unlock_bh(&sess->conn_lock);
4204 * If connection reinstatement is being performed on this connection,
4205 * up the connection reinstatement semaphore that is being blocked on
4206 * in iscsit_cause_connection_reinstatement().
4208 spin_lock_bh(&conn->state_lock);
4209 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4210 spin_unlock_bh(&conn->state_lock);
4211 complete(&conn->conn_wait_comp);
4212 wait_for_completion(&conn->conn_post_wait_comp);
4213 spin_lock_bh(&conn->state_lock);
4217 * If connection reinstatement is being performed on this connection
4218 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4219 * connection wait rcfr semaphore that is being blocked on
4220 * an iscsit_connection_reinstatement_rcfr().
4222 if (atomic_read(&conn->connection_wait_rcfr)) {
4223 spin_unlock_bh(&conn->state_lock);
4224 complete(&conn->conn_wait_rcfr_comp);
4225 wait_for_completion(&conn->conn_post_wait_comp);
4226 spin_lock_bh(&conn->state_lock);
4228 atomic_set(&conn->connection_reinstatement, 1);
4229 spin_unlock_bh(&conn->state_lock);
4232 * If any other processes are accessing this connection pointer we
4233 * must wait until they have completed.
4235 iscsit_check_conn_usage_count(conn);
4237 ahash_request_free(conn->conn_tx_hash);
4238 if (conn->conn_rx_hash) {
4239 struct crypto_ahash *tfm;
4241 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4242 ahash_request_free(conn->conn_rx_hash);
4243 crypto_free_ahash(tfm);
4246 free_cpumask_var(conn->conn_cpumask);
4248 kfree(conn->conn_ops);
4249 conn->conn_ops = NULL;
4252 sock_release(conn->sock);
4254 if (conn->conn_transport->iscsit_free_conn)
4255 conn->conn_transport->iscsit_free_conn(conn);
4257 iscsit_put_transport(conn->conn_transport);
4259 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4260 conn->conn_state = TARG_CONN_STATE_FREE;
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_entires(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 spin_lock(&sess_idr_lock);
4411 idr_remove(&sess_idr, sess->session_index);
4412 spin_unlock(&sess_idr_lock);
4414 kfree(sess->sess_ops);
4415 sess->sess_ops = NULL;
4416 spin_unlock_bh(&se_tpg->session_lock);
4422 static void iscsit_logout_post_handler_closesession(
4423 struct iscsi_conn *conn)
4425 struct iscsi_session *sess = conn->sess;
4428 * Traditional iscsi/tcp will invoke this logic from TX thread
4429 * context during session logout, so clear tx_thread_active and
4430 * sleep if iscsit_close_connection() has not already occured.
4432 * Since iser-target invokes this logic from it's own workqueue,
4433 * always sleep waiting for RX/TX thread shutdown to complete
4434 * within iscsit_close_connection().
4436 if (!conn->conn_transport->rdma_shutdown) {
4437 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4442 atomic_set(&conn->conn_logout_remove, 0);
4443 complete(&conn->conn_logout_comp);
4445 iscsit_dec_conn_usage_count(conn);
4446 iscsit_stop_session(sess, sleep, sleep);
4447 iscsit_dec_session_usage_count(sess);
4448 iscsit_close_session(sess);
4451 static void iscsit_logout_post_handler_samecid(
4452 struct iscsi_conn *conn)
4456 if (!conn->conn_transport->rdma_shutdown) {
4457 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4462 atomic_set(&conn->conn_logout_remove, 0);
4463 complete(&conn->conn_logout_comp);
4465 iscsit_cause_connection_reinstatement(conn, sleep);
4466 iscsit_dec_conn_usage_count(conn);
4469 static void iscsit_logout_post_handler_diffcid(
4470 struct iscsi_conn *conn,
4473 struct iscsi_conn *l_conn;
4474 struct iscsi_session *sess = conn->sess;
4475 bool conn_found = false;
4480 spin_lock_bh(&sess->conn_lock);
4481 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4482 if (l_conn->cid == cid) {
4483 iscsit_inc_conn_usage_count(l_conn);
4488 spin_unlock_bh(&sess->conn_lock);
4494 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4496 spin_lock_bh(&l_conn->state_lock);
4497 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4498 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4499 spin_unlock_bh(&l_conn->state_lock);
4501 iscsit_cause_connection_reinstatement(l_conn, 1);
4502 iscsit_dec_conn_usage_count(l_conn);
4506 * Return of 0 causes the TX thread to restart.
4508 int iscsit_logout_post_handler(
4509 struct iscsi_cmd *cmd,
4510 struct iscsi_conn *conn)
4514 switch (cmd->logout_reason) {
4515 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4516 switch (cmd->logout_response) {
4517 case ISCSI_LOGOUT_SUCCESS:
4518 case ISCSI_LOGOUT_CLEANUP_FAILED:
4520 iscsit_logout_post_handler_closesession(conn);
4525 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4526 if (conn->cid == cmd->logout_cid) {
4527 switch (cmd->logout_response) {
4528 case ISCSI_LOGOUT_SUCCESS:
4529 case ISCSI_LOGOUT_CLEANUP_FAILED:
4531 iscsit_logout_post_handler_samecid(conn);
4536 switch (cmd->logout_response) {
4537 case ISCSI_LOGOUT_SUCCESS:
4538 iscsit_logout_post_handler_diffcid(conn,
4541 case ISCSI_LOGOUT_CID_NOT_FOUND:
4542 case ISCSI_LOGOUT_CLEANUP_FAILED:
4549 case ISCSI_LOGOUT_REASON_RECOVERY:
4550 switch (cmd->logout_response) {
4551 case ISCSI_LOGOUT_SUCCESS:
4552 case ISCSI_LOGOUT_CID_NOT_FOUND:
4553 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4554 case ISCSI_LOGOUT_CLEANUP_FAILED:
4566 EXPORT_SYMBOL(iscsit_logout_post_handler);
4568 void iscsit_fail_session(struct iscsi_session *sess)
4570 struct iscsi_conn *conn;
4572 spin_lock_bh(&sess->conn_lock);
4573 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4574 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4575 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4577 spin_unlock_bh(&sess->conn_lock);
4579 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4580 sess->session_state = TARG_SESS_STATE_FAILED;
4583 int iscsit_free_session(struct iscsi_session *sess)
4585 u16 conn_count = atomic_read(&sess->nconn);
4586 struct iscsi_conn *conn, *conn_tmp = NULL;
4589 spin_lock_bh(&sess->conn_lock);
4590 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4592 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4594 if (conn_count == 0)
4597 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4600 iscsit_inc_conn_usage_count(conn_tmp);
4603 iscsit_inc_conn_usage_count(conn);
4605 spin_unlock_bh(&sess->conn_lock);
4606 iscsit_cause_connection_reinstatement(conn, 1);
4607 spin_lock_bh(&sess->conn_lock);
4609 iscsit_dec_conn_usage_count(conn);
4611 iscsit_dec_conn_usage_count(conn_tmp);
4616 if (atomic_read(&sess->nconn)) {
4617 spin_unlock_bh(&sess->conn_lock);
4618 wait_for_completion(&sess->session_wait_comp);
4620 spin_unlock_bh(&sess->conn_lock);
4622 iscsit_close_session(sess);
4626 void iscsit_stop_session(
4627 struct iscsi_session *sess,
4629 int connection_sleep)
4631 u16 conn_count = atomic_read(&sess->nconn);
4632 struct iscsi_conn *conn, *conn_tmp = NULL;
4635 spin_lock_bh(&sess->conn_lock);
4637 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4639 if (connection_sleep) {
4640 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4642 if (conn_count == 0)
4645 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4648 iscsit_inc_conn_usage_count(conn_tmp);
4651 iscsit_inc_conn_usage_count(conn);
4653 spin_unlock_bh(&sess->conn_lock);
4654 iscsit_cause_connection_reinstatement(conn, 1);
4655 spin_lock_bh(&sess->conn_lock);
4657 iscsit_dec_conn_usage_count(conn);
4659 iscsit_dec_conn_usage_count(conn_tmp);
4663 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4664 iscsit_cause_connection_reinstatement(conn, 0);
4667 if (session_sleep && atomic_read(&sess->nconn)) {
4668 spin_unlock_bh(&sess->conn_lock);
4669 wait_for_completion(&sess->session_wait_comp);
4671 spin_unlock_bh(&sess->conn_lock);
4674 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4676 struct iscsi_session *sess;
4677 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4678 struct se_session *se_sess, *se_sess_tmp;
4679 LIST_HEAD(free_list);
4680 int session_count = 0;
4682 spin_lock_bh(&se_tpg->session_lock);
4683 if (tpg->nsessions && !force) {
4684 spin_unlock_bh(&se_tpg->session_lock);
4688 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4690 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4692 spin_lock(&sess->conn_lock);
4693 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4694 atomic_read(&sess->session_logout) ||
4695 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4696 spin_unlock(&sess->conn_lock);
4699 atomic_set(&sess->session_reinstatement, 1);
4700 atomic_set(&sess->session_fall_back_to_erl0, 1);
4701 spin_unlock(&sess->conn_lock);
4703 list_move_tail(&se_sess->sess_list, &free_list);
4705 spin_unlock_bh(&se_tpg->session_lock);
4707 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4708 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4710 iscsit_free_session(sess);
4714 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4715 " Group: %hu\n", session_count, tpg->tpgt);
4719 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4720 MODULE_VERSION("4.1.x");
4721 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4722 MODULE_LICENSE("GPL");
4724 module_init(iscsi_target_init_module);
4725 module_exit(iscsi_target_cleanup_module);