1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <linux/inet.h>
31 #include <scsi/scsi_proto.h>
32 #include <scsi/iscsi_proto.h>
33 #include <scsi/scsi_tcq.h>
34 #include <target/target_core_base.h>
35 #include <target/target_core_fabric.h>
37 #include <target/iscsi/iscsi_target_core.h>
38 #include "iscsi_target_parameters.h"
39 #include "iscsi_target_seq_pdu_list.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include <target/iscsi/iscsi_target_stat.h>
52 #include <target/iscsi/iscsi_transport.h>
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_MUTEX(np_lock);
59 static struct idr tiqn_idr;
61 struct mutex auth_id_lock;
63 struct iscsit_global *iscsit_global;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75 struct iscsi_tiqn *tiqn = NULL;
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
88 spin_unlock(&tiqn->tiqn_state_lock);
91 spin_unlock(&tiqn_lock);
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
104 spin_unlock(&tiqn->tiqn_state_lock);
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122 struct iscsi_tiqn *tiqn = NULL;
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
128 return ERR_PTR(-EINVAL);
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
133 return ERR_PTR(-ENOMEM);
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160 spin_unlock(&tiqn_lock);
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172 * Wait for accesses to said struct iscsi_tiqn to end.
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
178 spin_lock(&tiqn->tiqn_state_lock);
180 spin_unlock(&tiqn->tiqn_state_lock);
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
196 iscsit_wait_for_tiqn(tiqn);
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
212 * Determine if the network portal is accepting storage traffic.
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
219 spin_unlock_bh(&np->np_thread_lock);
221 * Determine if the portal group is accepting storage traffic.
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
228 spin_unlock_bh(&tpg->tpg_state_lock);
231 * Here we serialize access across the TIQN+TPG Tuple.
233 ret = down_interruptible(&tpg->np_login_sem);
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
243 spin_unlock_bh(&tpg->tpg_state_lock);
248 void iscsit_login_kref_put(struct kref *kref)
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
253 complete(&tpg_np->tpg_np_comp);
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261 up(&tpg->np_login_sem);
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
267 iscsit_put_tiqn_for_login(tiqn);
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
275 int network_transport)
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->sin6_port);
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
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, const void *, void *);
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,
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,
553 padding, &cmd->pad_bytes,
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
568 ret = iscsit_send_tx_data(cmd, conn, 1);
570 iscsit_tx_thread_wait_for_tcp(conn);
577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
586 u32 iov_count = 0, tx_size = 0;
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
613 iov_count += iov_ret;
614 tx_size += datain->length;
616 cmd->padding = ((-datain->length) & 3);
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
645 iscsit_unmap_iovec(cmd);
648 iscsit_tx_thread_wait_for_tcp(conn);
655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
667 return TARGET_PROT_NORMAL;
670 static struct iscsit_transport iscsi_target_transport = {
672 .transport_type = ISCSI_TCP,
673 .rdma_shutdown = false,
675 .iscsit_setup_np = iscsit_setup_np,
676 .iscsit_accept_np = iscsit_accept_np,
677 .iscsit_free_np = iscsit_free_np,
678 .iscsit_get_login_rx = iscsit_get_login_rx,
679 .iscsit_put_login_tx = iscsit_put_login_tx,
680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
681 .iscsit_immediate_queue = iscsit_immediate_queue,
682 .iscsit_response_queue = iscsit_response_queue,
683 .iscsit_queue_data_in = iscsit_queue_rsp,
684 .iscsit_queue_status = iscsit_queue_rsp,
685 .iscsit_aborted_task = iscsit_aborted_task,
686 .iscsit_xmit_pdu = iscsit_xmit_pdu,
687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
691 static int __init iscsi_target_init_module(void)
695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
696 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
700 spin_lock_init(&iscsit_global->ts_bitmap_lock);
701 mutex_init(&auth_id_lock);
704 ret = target_register_template(&iscsi_ops);
708 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
709 iscsit_global->ts_bitmap = vzalloc(size);
710 if (!iscsit_global->ts_bitmap)
713 lio_qr_cache = kmem_cache_create("lio_qr_cache",
714 sizeof(struct iscsi_queue_req),
715 __alignof__(struct iscsi_queue_req), 0, NULL);
717 pr_err("Unable to kmem_cache_create() for"
722 lio_dr_cache = kmem_cache_create("lio_dr_cache",
723 sizeof(struct iscsi_datain_req),
724 __alignof__(struct iscsi_datain_req), 0, NULL);
726 pr_err("Unable to kmem_cache_create() for"
731 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
732 sizeof(struct iscsi_ooo_cmdsn),
733 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
734 if (!lio_ooo_cache) {
735 pr_err("Unable to kmem_cache_create() for"
740 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
741 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
743 if (!lio_r2t_cache) {
744 pr_err("Unable to kmem_cache_create() for"
749 iscsit_register_transport(&iscsi_target_transport);
751 if (iscsit_load_discovery_tpg() < 0)
756 iscsit_unregister_transport(&iscsi_target_transport);
757 kmem_cache_destroy(lio_r2t_cache);
759 kmem_cache_destroy(lio_ooo_cache);
761 kmem_cache_destroy(lio_dr_cache);
763 kmem_cache_destroy(lio_qr_cache);
765 vfree(iscsit_global->ts_bitmap);
767 /* XXX: this probably wants it to be it's own unwind step.. */
768 if (iscsit_global->discovery_tpg)
769 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
770 target_unregister_template(&iscsi_ops);
772 kfree(iscsit_global);
776 static void __exit iscsi_target_cleanup_module(void)
778 iscsit_release_discovery_tpg();
779 iscsit_unregister_transport(&iscsi_target_transport);
780 kmem_cache_destroy(lio_qr_cache);
781 kmem_cache_destroy(lio_dr_cache);
782 kmem_cache_destroy(lio_ooo_cache);
783 kmem_cache_destroy(lio_r2t_cache);
786 * Shutdown discovery sessions and disable discovery TPG
788 if (iscsit_global->discovery_tpg)
789 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
791 target_unregister_template(&iscsi_ops);
793 vfree(iscsit_global->ts_bitmap);
794 kfree(iscsit_global);
797 int iscsit_add_reject(
798 struct iscsi_conn *conn,
802 struct iscsi_cmd *cmd;
804 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
808 cmd->iscsi_opcode = ISCSI_OP_REJECT;
809 cmd->reject_reason = reason;
811 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
813 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
814 iscsit_free_cmd(cmd, false);
818 spin_lock_bh(&conn->cmd_lock);
819 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
820 spin_unlock_bh(&conn->cmd_lock);
822 cmd->i_state = ISTATE_SEND_REJECT;
823 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
827 EXPORT_SYMBOL(iscsit_add_reject);
829 static int iscsit_add_reject_from_cmd(
830 struct iscsi_cmd *cmd,
835 struct iscsi_conn *conn;
836 const bool do_put = cmd->se_cmd.se_tfo != NULL;
839 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
845 cmd->iscsi_opcode = ISCSI_OP_REJECT;
846 cmd->reject_reason = reason;
848 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
850 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
851 iscsit_free_cmd(cmd, false);
856 spin_lock_bh(&conn->cmd_lock);
857 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
858 spin_unlock_bh(&conn->cmd_lock);
861 cmd->i_state = ISTATE_SEND_REJECT;
862 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
864 * Perform the kref_put now if se_cmd has already been setup by
865 * scsit_setup_scsi_cmd()
868 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
869 target_put_sess_cmd(&cmd->se_cmd);
874 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
877 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
880 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
882 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
884 EXPORT_SYMBOL(iscsit_reject_cmd);
887 * Map some portion of the allocated scatterlist to an iovec, suitable for
888 * kernel sockets to copy data in/out.
890 static int iscsit_map_iovec(
891 struct iscsi_cmd *cmd,
897 struct scatterlist *sg;
898 unsigned int page_off;
901 * We know each entry in t_data_sg contains a page.
903 u32 ent = data_offset / PAGE_SIZE;
905 if (ent >= cmd->se_cmd.t_data_nents) {
906 pr_err("Initial page entry out-of-bounds\n");
910 sg = &cmd->se_cmd.t_data_sg[ent];
911 page_off = (data_offset % PAGE_SIZE);
913 cmd->first_data_sg = sg;
914 cmd->first_data_sg_off = page_off;
916 while (data_length) {
917 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
919 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
920 iov[i].iov_len = cur_len;
922 data_length -= cur_len;
928 cmd->kmapped_nents = i;
933 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
936 struct scatterlist *sg;
938 sg = cmd->first_data_sg;
940 for (i = 0; i < cmd->kmapped_nents; i++)
941 kunmap(sg_page(&sg[i]));
944 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
947 struct iscsi_cmd *cmd, *cmd_p;
949 conn->exp_statsn = exp_statsn;
951 if (conn->sess->sess_ops->RDMAExtensions)
954 spin_lock_bh(&conn->cmd_lock);
955 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
956 spin_lock(&cmd->istate_lock);
957 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
958 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
959 cmd->i_state = ISTATE_REMOVE;
960 spin_unlock(&cmd->istate_lock);
961 list_move_tail(&cmd->i_conn_node, &ack_list);
964 spin_unlock(&cmd->istate_lock);
966 spin_unlock_bh(&conn->cmd_lock);
968 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
969 list_del_init(&cmd->i_conn_node);
970 iscsit_free_cmd(cmd, false);
974 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
976 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
978 iov_count += ISCSI_IOV_DATA_BUFFER;
979 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
983 cmd->orig_iov_data_count = iov_count;
987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
990 int data_direction, payload_length;
991 struct iscsi_scsi_req *hdr;
995 atomic_long_inc(&conn->sess->cmd_pdus);
997 hdr = (struct iscsi_scsi_req *) buf;
998 payload_length = ntoh24(hdr->dlength);
1000 /* FIXME; Add checks for AdditionalHeaderSegment */
1002 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1003 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1004 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005 " not set. Bad iSCSI Initiator.\n");
1006 return iscsit_add_reject_cmd(cmd,
1007 ISCSI_REASON_BOOKMARK_INVALID, buf);
1010 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1011 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1013 * From RFC-3720 Section 10.3.1:
1015 * "Either or both of R and W MAY be 1 when either the
1016 * Expected Data Transfer Length and/or Bidirectional Read
1017 * Expected Data Transfer Length are 0"
1019 * For this case, go ahead and clear the unnecssary bits
1020 * to avoid any confusion with ->data_direction.
1022 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1023 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1025 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026 " set when Expected Data Transfer Length is 0 for"
1027 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1030 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1031 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1032 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033 " MUST be set if Expected Data Transfer Length is not 0."
1034 " Bad iSCSI Initiator\n");
1035 return iscsit_add_reject_cmd(cmd,
1036 ISCSI_REASON_BOOKMARK_INVALID, buf);
1039 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1041 pr_err("Bidirectional operations not supported!\n");
1042 return iscsit_add_reject_cmd(cmd,
1043 ISCSI_REASON_BOOKMARK_INVALID, buf);
1046 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1047 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048 " Scsi Command PDU.\n");
1049 return iscsit_add_reject_cmd(cmd,
1050 ISCSI_REASON_BOOKMARK_INVALID, buf);
1053 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1054 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055 " protocol error.\n", payload_length);
1056 return iscsit_add_reject_cmd(cmd,
1057 ISCSI_REASON_PROTOCOL_ERROR, buf);
1060 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1061 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1062 pr_err("Expected Data Transfer Length and Length of"
1063 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064 " bit is not set protocol error\n");
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_PROTOCOL_ERROR, buf);
1069 if (payload_length > be32_to_cpu(hdr->data_length)) {
1070 pr_err("DataSegmentLength: %u is greater than"
1071 " EDTL: %u, protocol error.\n", payload_length,
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1077 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1085 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " FirstBurstLength: %u, protocol error.\n",
1088 payload_length, conn->sess->sess_ops->FirstBurstLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_BOOKMARK_INVALID, buf);
1093 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1094 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097 cmd->data_direction = data_direction;
1098 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1100 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1102 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1103 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1104 sam_task_attr = TCM_SIMPLE_TAG;
1105 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1106 sam_task_attr = TCM_ORDERED_TAG;
1107 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1108 sam_task_attr = TCM_HEAD_TAG;
1109 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1110 sam_task_attr = TCM_ACA_TAG;
1112 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1114 sam_task_attr = TCM_SIMPLE_TAG;
1117 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1118 cmd->i_state = ISTATE_NEW_CMD;
1119 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1120 cmd->immediate_data = (payload_length) ? 1 : 0;
1121 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1122 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1123 if (cmd->unsolicited_data)
1124 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1126 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1127 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1128 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1130 cmd->targ_xfer_tag = 0xFFFFFFFF;
1131 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1132 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1133 cmd->first_burst_len = payload_length;
1135 if (!conn->sess->sess_ops->RDMAExtensions &&
1136 cmd->data_direction == DMA_FROM_DEVICE) {
1137 struct iscsi_datain_req *dr;
1139 dr = iscsit_allocate_datain_req();
1141 return iscsit_add_reject_cmd(cmd,
1142 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1144 iscsit_attach_datain_req(cmd, dr);
1148 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1150 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1151 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1152 cmd->data_direction, sam_task_attr,
1153 cmd->sense_buffer + 2);
1155 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1157 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160 target_get_sess_cmd(&cmd->se_cmd, true);
1162 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1163 scsilun_to_int(&hdr->lun));
1164 if (cmd->sense_reason)
1167 /* only used for printks or comparing with ->ref_task_tag */
1168 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1169 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1170 if (cmd->sense_reason) {
1171 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172 return iscsit_add_reject_cmd(cmd,
1173 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1179 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1185 spin_lock_bh(&conn->cmd_lock);
1186 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1187 spin_unlock_bh(&conn->cmd_lock);
1189 * Check if we need to delay processing because of ALUA
1190 * Active/NonOptimized primary access state..
1192 core_alua_check_nonop_delay(&cmd->se_cmd);
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1200 iscsit_set_dataout_sequence_values(cmd);
1202 spin_lock_bh(&cmd->dataout_timeout_lock);
1203 iscsit_start_dataout_timer(cmd, cmd->conn);
1204 spin_unlock_bh(&cmd->dataout_timeout_lock);
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1209 struct iscsi_scsi_req *hdr)
1213 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214 * the Immediate Bit is not set, and no Immediate
1217 * A PDU/CmdSN carrying Immediate Data can only
1218 * be processed after the DataCRC has passed.
1219 * If the DataCRC fails, the CmdSN MUST NOT
1220 * be acknowledged. (See below)
1222 if (!cmd->immediate_data) {
1223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1224 (unsigned char *)hdr, hdr->cmdsn);
1225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1227 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1228 target_put_sess_cmd(&cmd->se_cmd);
1233 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1236 * If no Immediate Data is attached, it's OK to return now.
1238 if (!cmd->immediate_data) {
1239 if (!cmd->sense_reason && cmd->unsolicited_data)
1240 iscsit_set_unsoliticed_dataout(cmd);
1241 if (!cmd->sense_reason)
1244 target_put_sess_cmd(&cmd->se_cmd);
1249 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250 * execution. These exceptions are processed in CmdSN order using
1251 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1253 if (cmd->sense_reason)
1256 * Call directly into transport_generic_new_cmd() to perform
1257 * the backend memory allocation.
1259 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1260 if (cmd->sense_reason)
1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1268 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1271 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1273 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1276 goto after_immediate_data;
1278 * Check for underflow case where both EDTL and immediate data payload
1279 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1280 * already been set in target_cmd_size_check() as se_cmd->data_length.
1282 * For this special case, fail the command and dump the immediate data
1285 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1286 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1287 goto after_immediate_data;
1290 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291 cmd->first_burst_len);
1292 after_immediate_data:
1293 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1295 * A PDU/CmdSN carrying Immediate Data passed
1296 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297 * Immediate Bit is not set.
1299 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300 (unsigned char *)hdr, hdr->cmdsn);
1301 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1304 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1307 rc = iscsit_dump_data_payload(cmd->conn,
1308 cmd->first_burst_len, 1);
1309 target_put_sess_cmd(&cmd->se_cmd);
1311 } else if (cmd->unsolicited_data)
1312 iscsit_set_unsoliticed_dataout(cmd);
1314 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1316 * Immediate Data failed DataCRC and ERL>=1,
1317 * silently drop this PDU and let the initiator
1318 * plug the CmdSN gap.
1320 * FIXME: Send Unsolicited NOPIN with reserved
1321 * TTT here to help the initiator figure out
1322 * the missing CmdSN, although they should be
1323 * intelligent enough to determine the missing
1324 * CmdSN and issue a retry to plug the sequence.
1326 cmd->i_state = ISTATE_REMOVE;
1327 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1338 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1340 bool dump_payload = false;
1342 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1346 * Allocation iovecs needed for struct socket operations for
1347 * traditional iSCSI block I/O.
1349 if (iscsit_allocate_iovecs(cmd) < 0) {
1350 return iscsit_reject_cmd(cmd,
1351 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1353 immed_data = cmd->immediate_data;
1355 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1359 dump_payload = true;
1364 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1367 static u32 iscsit_do_crypto_hash_sg(
1368 struct ahash_request *hash,
1369 struct iscsi_cmd *cmd,
1376 struct scatterlist *sg;
1377 unsigned int page_off;
1379 crypto_ahash_init(hash);
1381 sg = cmd->first_data_sg;
1382 page_off = cmd->first_data_sg_off;
1384 while (data_length) {
1385 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1387 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1388 crypto_ahash_update(hash);
1390 data_length -= cur_len;
1392 /* iscsit_map_iovec has already checked for invalid sg pointers */
1397 struct scatterlist pad_sg;
1399 sg_init_one(&pad_sg, pad_bytes, padding);
1400 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1402 crypto_ahash_finup(hash);
1404 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1405 crypto_ahash_final(hash);
1411 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1412 const void *buf, u32 payload_length, u32 padding,
1413 const void *pad_bytes, void *data_crc)
1415 struct scatterlist sg[2];
1417 sg_init_table(sg, ARRAY_SIZE(sg));
1418 sg_set_buf(sg, buf, payload_length);
1420 sg_set_buf(sg + 1, pad_bytes, padding);
1422 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1424 crypto_ahash_digest(hash);
1428 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1429 struct iscsi_cmd *cmd, u32 payload_length,
1432 struct iscsi_data *hdr = buf;
1433 struct se_cmd *se_cmd;
1437 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1439 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1440 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1441 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1442 payload_length, conn->cid);
1444 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1445 pr_err("Command ITT: 0x%08x received DataOUT after"
1446 " last DataOUT received, dumping payload\n",
1447 cmd->init_task_tag);
1448 return iscsit_dump_data_payload(conn, payload_length, 1);
1451 if (cmd->data_direction != DMA_TO_DEVICE) {
1452 pr_err("Command ITT: 0x%08x received DataOUT for a"
1453 " NON-WRITE command.\n", cmd->init_task_tag);
1454 return iscsit_dump_data_payload(conn, payload_length, 1);
1456 se_cmd = &cmd->se_cmd;
1457 iscsit_mod_dataout_timer(cmd);
1459 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1460 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1461 be32_to_cpu(hdr->offset), payload_length,
1462 cmd->se_cmd.data_length);
1463 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1466 if (cmd->unsolicited_data) {
1467 int dump_unsolicited_data = 0;
1469 if (conn->sess->sess_ops->InitialR2T) {
1470 pr_err("Received unexpected unsolicited data"
1471 " while InitialR2T=Yes, protocol error.\n");
1472 transport_send_check_condition_and_sense(&cmd->se_cmd,
1473 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1477 * Special case for dealing with Unsolicited DataOUT
1478 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1482 /* Something's amiss if we're not in WRITE_PENDING state... */
1483 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1484 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1485 dump_unsolicited_data = 1;
1487 if (dump_unsolicited_data) {
1489 * Check if a delayed TASK_ABORTED status needs to
1490 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1491 * received with the unsolicited data out.
1493 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1494 iscsit_stop_dataout_timer(cmd);
1496 return iscsit_dump_data_payload(conn, payload_length, 1);
1500 * For the normal solicited data path:
1502 * Check for a delayed TASK_ABORTED status and dump any
1503 * incoming data out payload if one exists. Also, when the
1504 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1505 * data out sequence, we decrement outstanding_r2ts. Once
1506 * outstanding_r2ts reaches zero, go ahead and send the delayed
1507 * TASK_ABORTED status.
1509 if (se_cmd->transport_state & CMD_T_ABORTED) {
1510 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1511 --cmd->outstanding_r2ts < 1)
1512 iscsit_stop_dataout_timer(cmd);
1514 return iscsit_dump_data_payload(conn, payload_length, 1);
1518 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1519 * within-command recovery checks before receiving the payload.
1521 rc = iscsit_check_pre_dataout(cmd, buf);
1522 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1524 else if (rc == DATAOUT_CANNOT_RECOVER)
1529 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1532 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1533 struct iscsi_cmd **out_cmd)
1535 struct iscsi_data *hdr = buf;
1536 struct iscsi_cmd *cmd;
1537 u32 payload_length = ntoh24(hdr->dlength);
1539 bool success = false;
1541 if (!payload_length) {
1542 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1546 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1548 " MaxXmitDataSegmentLength: %u\n", payload_length,
1549 conn->conn_ops->MaxXmitDataSegmentLength);
1550 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1553 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1557 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1564 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1567 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1568 struct iscsi_data *hdr)
1571 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1572 u32 payload_length = ntoh24(hdr->dlength);
1573 int iov_ret, data_crc_failed = 0;
1575 rx_size += payload_length;
1576 iov = &cmd->iov_data[0];
1578 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1583 iov_count += iov_ret;
1585 padding = ((-payload_length) & 3);
1587 iov[iov_count].iov_base = cmd->pad_bytes;
1588 iov[iov_count++].iov_len = padding;
1590 pr_debug("Receiving %u padding bytes.\n", padding);
1593 if (conn->conn_ops->DataDigest) {
1594 iov[iov_count].iov_base = &checksum;
1595 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1596 rx_size += ISCSI_CRC_LEN;
1599 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1601 iscsit_unmap_iovec(cmd);
1603 if (rx_got != rx_size)
1606 if (conn->conn_ops->DataDigest) {
1609 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1610 be32_to_cpu(hdr->offset),
1611 payload_length, padding,
1614 if (checksum != data_crc) {
1615 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1616 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1617 " does not match computed 0x%08x\n",
1618 hdr->itt, hdr->offset, payload_length,
1619 hdr->datasn, checksum, data_crc);
1620 data_crc_failed = 1;
1622 pr_debug("Got CRC32C DataDigest 0x%08x for"
1623 " %u bytes of Data Out\n", checksum,
1628 return data_crc_failed;
1632 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1633 bool data_crc_failed)
1635 struct iscsi_conn *conn = cmd->conn;
1638 * Increment post receive data and CRC values or perform
1639 * within-command recovery.
1641 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1642 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1644 else if (rc == DATAOUT_SEND_R2T) {
1645 iscsit_set_dataout_sequence_values(cmd);
1646 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1647 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1649 * Handle extra special case for out of order
1650 * Unsolicited Data Out.
1652 spin_lock_bh(&cmd->istate_lock);
1653 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1654 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1655 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1656 spin_unlock_bh(&cmd->istate_lock);
1658 iscsit_stop_dataout_timer(cmd);
1661 target_execute_cmd(&cmd->se_cmd);
1663 } else /* DATAOUT_CANNOT_RECOVER */
1668 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1670 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1672 struct iscsi_cmd *cmd = NULL;
1673 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1675 bool data_crc_failed = false;
1677 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1683 rc = iscsit_get_dataout(conn, cmd, hdr);
1687 data_crc_failed = true;
1689 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1692 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1693 struct iscsi_nopout *hdr)
1695 u32 payload_length = ntoh24(hdr->dlength);
1697 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1698 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1700 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1701 (unsigned char *)hdr);
1703 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1704 (unsigned char *)hdr);
1707 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1708 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1709 " not set, protocol error.\n");
1711 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1712 (unsigned char *)hdr);
1714 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1715 (unsigned char *)hdr);
1718 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1719 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1720 " greater than MaxXmitDataSegmentLength: %u, protocol"
1721 " error.\n", payload_length,
1722 conn->conn_ops->MaxXmitDataSegmentLength);
1724 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1725 (unsigned char *)hdr);
1727 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1728 (unsigned char *)hdr);
1731 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1732 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1733 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1734 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1737 * This is not a response to a Unsolicited NopIN, which means
1738 * it can either be a NOPOUT ping request (with a valid ITT),
1739 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1740 * Either way, make sure we allocate an struct iscsi_cmd, as both
1741 * can contain ping data.
1743 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1744 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1745 cmd->i_state = ISTATE_SEND_NOPIN;
1746 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1748 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1749 cmd->targ_xfer_tag = 0xFFFFFFFF;
1750 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1751 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1752 cmd->data_direction = DMA_NONE;
1757 EXPORT_SYMBOL(iscsit_setup_nop_out);
1759 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1760 struct iscsi_nopout *hdr)
1762 struct iscsi_cmd *cmd_p = NULL;
1765 * Initiator is expecting a NopIN ping reply..
1767 if (hdr->itt != RESERVED_ITT) {
1769 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1770 (unsigned char *)hdr);
1772 spin_lock_bh(&conn->cmd_lock);
1773 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1774 spin_unlock_bh(&conn->cmd_lock);
1776 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1778 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1779 iscsit_add_cmd_to_response_queue(cmd, conn,
1784 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1785 (unsigned char *)hdr, hdr->cmdsn);
1786 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1788 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1794 * This was a response to a unsolicited NOPIN ping.
1796 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1797 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1801 iscsit_stop_nopin_response_timer(conn);
1803 cmd_p->i_state = ISTATE_REMOVE;
1804 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1806 iscsit_start_nopin_timer(conn);
1810 * Otherwise, initiator is not expecting a NOPIN is response.
1811 * Just ignore for now.
1815 iscsit_free_cmd(cmd, false);
1819 EXPORT_SYMBOL(iscsit_process_nop_out);
1821 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1824 unsigned char *ping_data = NULL;
1825 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1826 struct kvec *iov = NULL;
1827 u32 payload_length = ntoh24(hdr->dlength);
1830 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1834 * Handle NOP-OUT payload for traditional iSCSI sockets
1836 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1837 u32 checksum, data_crc, padding = 0;
1838 int niov = 0, rx_got, rx_size = payload_length;
1840 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1846 iov = &cmd->iov_misc[0];
1847 iov[niov].iov_base = ping_data;
1848 iov[niov++].iov_len = payload_length;
1850 padding = ((-payload_length) & 3);
1852 pr_debug("Receiving %u additional bytes"
1853 " for padding.\n", padding);
1854 iov[niov].iov_base = &cmd->pad_bytes;
1855 iov[niov++].iov_len = padding;
1858 if (conn->conn_ops->DataDigest) {
1859 iov[niov].iov_base = &checksum;
1860 iov[niov++].iov_len = ISCSI_CRC_LEN;
1861 rx_size += ISCSI_CRC_LEN;
1864 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1865 if (rx_got != rx_size) {
1870 if (conn->conn_ops->DataDigest) {
1871 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1872 payload_length, padding,
1873 cmd->pad_bytes, &data_crc);
1875 if (checksum != data_crc) {
1876 pr_err("Ping data CRC32C DataDigest"
1877 " 0x%08x does not match computed 0x%08x\n",
1878 checksum, data_crc);
1879 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1880 pr_err("Unable to recover from"
1881 " NOPOUT Ping DataCRC failure while in"
1887 * Silently drop this PDU and let the
1888 * initiator plug the CmdSN gap.
1890 pr_debug("Dropping NOPOUT"
1891 " Command CmdSN: 0x%08x due to"
1892 " DataCRC error.\n", hdr->cmdsn);
1897 pr_debug("Got CRC32C DataDigest"
1898 " 0x%08x for %u bytes of ping data.\n",
1899 checksum, payload_length);
1903 ping_data[payload_length] = '\0';
1905 * Attach ping data to struct iscsi_cmd->buf_ptr.
1907 cmd->buf_ptr = ping_data;
1908 cmd->buf_ptr_size = payload_length;
1910 pr_debug("Got %u bytes of NOPOUT ping"
1911 " data.\n", payload_length);
1912 pr_debug("Ping Data: \"%s\"\n", ping_data);
1915 return iscsit_process_nop_out(conn, cmd, hdr);
1918 iscsit_free_cmd(cmd, false);
1924 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1926 switch (iscsi_tmf) {
1927 case ISCSI_TM_FUNC_ABORT_TASK:
1928 return TMR_ABORT_TASK;
1929 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1930 return TMR_ABORT_TASK_SET;
1931 case ISCSI_TM_FUNC_CLEAR_ACA:
1932 return TMR_CLEAR_ACA;
1933 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1934 return TMR_CLEAR_TASK_SET;
1935 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1936 return TMR_LUN_RESET;
1937 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1938 return TMR_TARGET_WARM_RESET;
1939 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1940 return TMR_TARGET_COLD_RESET;
1947 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1950 struct se_tmr_req *se_tmr;
1951 struct iscsi_tmr_req *tmr_req;
1952 struct iscsi_tm *hdr;
1953 int out_of_order_cmdsn = 0, ret;
1954 u8 function, tcm_function = TMR_UNKNOWN;
1956 hdr = (struct iscsi_tm *) buf;
1957 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1958 function = hdr->flags;
1960 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1961 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1962 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1963 hdr->rtt, hdr->refcmdsn, conn->cid);
1965 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1966 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1967 hdr->rtt != RESERVED_ITT)) {
1968 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1969 hdr->rtt = RESERVED_ITT;
1972 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1973 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1974 pr_err("Task Management Request TASK_REASSIGN not"
1975 " issued as immediate command, bad iSCSI Initiator"
1976 "implementation\n");
1977 return iscsit_add_reject_cmd(cmd,
1978 ISCSI_REASON_PROTOCOL_ERROR, buf);
1980 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1981 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1982 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1984 cmd->data_direction = DMA_NONE;
1985 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1986 if (!cmd->tmr_req) {
1987 return iscsit_add_reject_cmd(cmd,
1988 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1992 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1993 conn->sess->se_sess, 0, DMA_NONE,
1994 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1996 target_get_sess_cmd(&cmd->se_cmd, true);
1999 * TASK_REASSIGN for ERL=2 / connection stays inside of
2000 * LIO-Target $FABRIC_MOD
2002 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2003 tcm_function = iscsit_convert_tmf(function);
2004 if (tcm_function == TMR_UNKNOWN) {
2005 pr_err("Unknown iSCSI TMR Function:"
2006 " 0x%02x\n", function);
2007 return iscsit_add_reject_cmd(cmd,
2008 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2011 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2014 return iscsit_add_reject_cmd(cmd,
2015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2017 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2019 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2020 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2021 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2022 cmd->init_task_tag = hdr->itt;
2023 cmd->targ_xfer_tag = 0xFFFFFFFF;
2024 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2025 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2026 se_tmr = cmd->se_cmd.se_tmr_req;
2027 tmr_req = cmd->tmr_req;
2029 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2031 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2032 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2033 scsilun_to_int(&hdr->lun));
2035 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2041 case ISCSI_TM_FUNC_ABORT_TASK:
2042 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2043 if (se_tmr->response)
2046 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2047 case ISCSI_TM_FUNC_CLEAR_ACA:
2048 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2049 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2051 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2052 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2053 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2057 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2058 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2059 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2063 case ISCSI_TM_FUNC_TASK_REASSIGN:
2064 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2066 * Perform sanity checks on the ExpDataSN only if the
2067 * TASK_REASSIGN was successful.
2069 if (se_tmr->response)
2072 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2073 return iscsit_add_reject_cmd(cmd,
2074 ISCSI_REASON_BOOKMARK_INVALID, buf);
2077 pr_err("Unknown TMR function: 0x%02x, protocol"
2078 " error.\n", function);
2079 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2083 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2084 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2085 se_tmr->call_transport = 1;
2087 spin_lock_bh(&conn->cmd_lock);
2088 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2089 spin_unlock_bh(&conn->cmd_lock);
2091 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2092 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2093 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2094 out_of_order_cmdsn = 1;
2095 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2096 target_put_sess_cmd(&cmd->se_cmd);
2098 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2102 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2104 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2107 * Found the referenced task, send to transport for processing.
2109 if (se_tmr->call_transport)
2110 return transport_generic_handle_tmr(&cmd->se_cmd);
2113 * Could not find the referenced LUN, task, or Task Management
2114 * command not authorized or supported. Change state and
2115 * let the tx_thread send the response.
2117 * For connection recovery, this is also the default action for
2118 * TMR TASK_REASSIGN.
2120 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2121 target_put_sess_cmd(&cmd->se_cmd);
2124 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2126 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2128 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2129 struct iscsi_text *hdr)
2131 u32 payload_length = ntoh24(hdr->dlength);
2133 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2134 pr_err("Unable to accept text parameter length: %u"
2135 "greater than MaxXmitDataSegmentLength %u.\n",
2136 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2137 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2138 (unsigned char *)hdr);
2141 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2142 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2143 pr_err("Multi sequence text commands currently not supported\n");
2144 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2145 (unsigned char *)hdr);
2148 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2149 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2150 hdr->exp_statsn, payload_length);
2152 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2153 cmd->i_state = ISTATE_SEND_TEXTRSP;
2154 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2155 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2156 cmd->targ_xfer_tag = 0xFFFFFFFF;
2157 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2158 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2159 cmd->data_direction = DMA_NONE;
2160 kfree(cmd->text_in_ptr);
2161 cmd->text_in_ptr = NULL;
2165 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2168 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2169 struct iscsi_text *hdr)
2171 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2175 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2176 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2177 pr_err("Unable to locate text_in buffer for sendtargets"
2181 goto empty_sendtargets;
2183 if (strncmp("SendTargets", text_in, 11) != 0) {
2184 pr_err("Received Text Data that is not"
2185 " SendTargets, cannot continue.\n");
2188 text_ptr = strchr(text_in, '=');
2190 pr_err("No \"=\" separator found in Text Data,"
2191 " cannot continue.\n");
2194 if (!strncmp("=All", text_ptr, 4)) {
2195 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2196 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2197 !strncmp("=eui.", text_ptr, 5)) {
2198 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2200 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2204 spin_lock_bh(&conn->cmd_lock);
2205 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2206 spin_unlock_bh(&conn->cmd_lock);
2209 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2211 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2212 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2213 (unsigned char *)hdr, hdr->cmdsn);
2214 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2220 return iscsit_execute_cmd(cmd, 0);
2223 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2224 (unsigned char *)hdr);
2226 EXPORT_SYMBOL(iscsit_process_text_cmd);
2229 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2232 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2233 char *text_in = NULL;
2234 u32 payload_length = ntoh24(hdr->dlength);
2237 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2241 rx_size = payload_length;
2242 if (payload_length) {
2243 u32 checksum = 0, data_crc = 0;
2244 u32 padding = 0, pad_bytes = 0;
2245 int niov = 0, rx_got;
2248 text_in = kzalloc(payload_length, GFP_KERNEL);
2252 cmd->text_in_ptr = text_in;
2254 memset(iov, 0, 3 * sizeof(struct kvec));
2255 iov[niov].iov_base = text_in;
2256 iov[niov++].iov_len = payload_length;
2258 padding = ((-payload_length) & 3);
2260 iov[niov].iov_base = &pad_bytes;
2261 iov[niov++].iov_len = padding;
2263 pr_debug("Receiving %u additional bytes"
2264 " for padding.\n", padding);
2266 if (conn->conn_ops->DataDigest) {
2267 iov[niov].iov_base = &checksum;
2268 iov[niov++].iov_len = ISCSI_CRC_LEN;
2269 rx_size += ISCSI_CRC_LEN;
2272 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2273 if (rx_got != rx_size)
2276 if (conn->conn_ops->DataDigest) {
2277 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2278 payload_length, padding,
2279 &pad_bytes, &data_crc);
2281 if (checksum != data_crc) {
2282 pr_err("Text data CRC32C DataDigest"
2283 " 0x%08x does not match computed"
2284 " 0x%08x\n", checksum, data_crc);
2285 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2286 pr_err("Unable to recover from"
2287 " Text Data digest failure while in"
2292 * Silently drop this PDU and let the
2293 * initiator plug the CmdSN gap.
2295 pr_debug("Dropping Text"
2296 " Command CmdSN: 0x%08x due to"
2297 " DataCRC error.\n", hdr->cmdsn);
2302 pr_debug("Got CRC32C DataDigest"
2303 " 0x%08x for %u bytes of text data.\n",
2304 checksum, payload_length);
2307 text_in[payload_length - 1] = '\0';
2308 pr_debug("Successfully read %d bytes of text"
2309 " data.\n", payload_length);
2312 return iscsit_process_text_cmd(conn, cmd, hdr);
2315 kfree(cmd->text_in_ptr);
2316 cmd->text_in_ptr = NULL;
2317 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2320 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2322 struct iscsi_conn *conn_p;
2323 struct iscsi_session *sess = conn->sess;
2325 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2326 " for SID: %u.\n", conn->cid, conn->sess->sid);
2328 atomic_set(&sess->session_logout, 1);
2329 atomic_set(&conn->conn_logout_remove, 1);
2330 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2332 iscsit_inc_conn_usage_count(conn);
2333 iscsit_inc_session_usage_count(sess);
2335 spin_lock_bh(&sess->conn_lock);
2336 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2337 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2340 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2341 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2343 spin_unlock_bh(&sess->conn_lock);
2345 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2350 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2352 struct iscsi_conn *l_conn;
2353 struct iscsi_session *sess = conn->sess;
2355 pr_debug("Received logout request CLOSECONNECTION for CID:"
2356 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2359 * A Logout Request with a CLOSECONNECTION reason code for a CID
2360 * can arrive on a connection with a differing CID.
2362 if (conn->cid == cmd->logout_cid) {
2363 spin_lock_bh(&conn->state_lock);
2364 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2365 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2367 atomic_set(&conn->conn_logout_remove, 1);
2368 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2369 iscsit_inc_conn_usage_count(conn);
2371 spin_unlock_bh(&conn->state_lock);
2374 * Handle all different cid CLOSECONNECTION requests in
2375 * iscsit_logout_post_handler_diffcid() as to give enough
2376 * time for any non immediate command's CmdSN to be
2377 * acknowledged on the connection in question.
2379 * Here we simply make sure the CID is still around.
2381 l_conn = iscsit_get_conn_from_cid(sess,
2384 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2385 iscsit_add_cmd_to_response_queue(cmd, conn,
2390 iscsit_dec_conn_usage_count(l_conn);
2393 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2398 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2400 struct iscsi_session *sess = conn->sess;
2402 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2403 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2405 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2406 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2407 " while ERL!=2.\n");
2408 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2409 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2413 if (conn->cid == cmd->logout_cid) {
2414 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2415 " with CID: %hu on CID: %hu, implementation error.\n",
2416 cmd->logout_cid, conn->cid);
2417 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2418 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2422 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2428 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2431 int cmdsn_ret, logout_remove = 0;
2433 struct iscsi_logout *hdr;
2434 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2436 hdr = (struct iscsi_logout *) buf;
2437 reason_code = (hdr->flags & 0x7f);
2440 spin_lock(&tiqn->logout_stats.lock);
2441 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2442 tiqn->logout_stats.normal_logouts++;
2444 tiqn->logout_stats.abnormal_logouts++;
2445 spin_unlock(&tiqn->logout_stats.lock);
2448 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2449 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2450 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2451 hdr->cid, conn->cid);
2453 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2454 pr_err("Received logout request on connection that"
2455 " is not in logged in state, ignoring request.\n");
2456 iscsit_free_cmd(cmd, false);
2460 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2461 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2462 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2463 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2464 cmd->targ_xfer_tag = 0xFFFFFFFF;
2465 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2466 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2467 cmd->logout_cid = be16_to_cpu(hdr->cid);
2468 cmd->logout_reason = reason_code;
2469 cmd->data_direction = DMA_NONE;
2472 * We need to sleep in these cases (by returning 1) until the Logout
2473 * Response gets sent in the tx thread.
2475 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2476 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2477 be16_to_cpu(hdr->cid) == conn->cid))
2480 spin_lock_bh(&conn->cmd_lock);
2481 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2482 spin_unlock_bh(&conn->cmd_lock);
2484 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2485 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2488 * Immediate commands are executed, well, immediately.
2489 * Non-Immediate Logout Commands are executed in CmdSN order.
2491 if (cmd->immediate_cmd) {
2492 int ret = iscsit_execute_cmd(cmd, 0);
2497 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2498 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2500 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2504 return logout_remove;
2506 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2508 int iscsit_handle_snack(
2509 struct iscsi_conn *conn,
2512 struct iscsi_snack *hdr;
2514 hdr = (struct iscsi_snack *) buf;
2515 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2517 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2518 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2519 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2520 hdr->begrun, hdr->runlength, conn->cid);
2522 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2523 pr_err("Initiator sent SNACK request while in"
2524 " ErrorRecoveryLevel=0.\n");
2525 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2529 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2530 * call from inside iscsi_send_recovery_datain_or_r2t().
2532 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2534 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2536 be32_to_cpu(hdr->ttt),
2537 be32_to_cpu(hdr->begrun),
2538 be32_to_cpu(hdr->runlength));
2539 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2540 return iscsit_handle_status_snack(conn, hdr->itt,
2541 be32_to_cpu(hdr->ttt),
2542 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2543 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2544 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2545 be32_to_cpu(hdr->begrun),
2546 be32_to_cpu(hdr->runlength));
2547 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2548 /* FIXME: Support R-Data SNACK */
2549 pr_err("R-Data SNACK Not Supported.\n");
2550 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2553 pr_err("Unknown SNACK type 0x%02x, protocol"
2554 " error.\n", hdr->flags & 0x0f);
2555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561 EXPORT_SYMBOL(iscsit_handle_snack);
2563 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2565 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2566 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2567 wait_for_completion_interruptible_timeout(
2568 &conn->rx_half_close_comp,
2569 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2573 static int iscsit_handle_immediate_data(
2574 struct iscsi_cmd *cmd,
2575 struct iscsi_scsi_req *hdr,
2578 int iov_ret, rx_got = 0, rx_size = 0;
2579 u32 checksum, iov_count = 0, padding = 0;
2580 struct iscsi_conn *conn = cmd->conn;
2583 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2585 return IMMEDIATE_DATA_CANNOT_RECOVER;
2588 iov_count = iov_ret;
2589 iov = &cmd->iov_data[0];
2591 padding = ((-length) & 3);
2593 iov[iov_count].iov_base = cmd->pad_bytes;
2594 iov[iov_count++].iov_len = padding;
2598 if (conn->conn_ops->DataDigest) {
2599 iov[iov_count].iov_base = &checksum;
2600 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2601 rx_size += ISCSI_CRC_LEN;
2604 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2606 iscsit_unmap_iovec(cmd);
2608 if (rx_got != rx_size) {
2609 iscsit_rx_thread_wait_for_tcp(conn);
2610 return IMMEDIATE_DATA_CANNOT_RECOVER;
2613 if (conn->conn_ops->DataDigest) {
2616 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2617 cmd->write_data_done, length, padding,
2620 if (checksum != data_crc) {
2621 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2622 " does not match computed 0x%08x\n", checksum,
2625 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2626 pr_err("Unable to recover from"
2627 " Immediate Data digest failure while"
2629 iscsit_reject_cmd(cmd,
2630 ISCSI_REASON_DATA_DIGEST_ERROR,
2631 (unsigned char *)hdr);
2632 return IMMEDIATE_DATA_CANNOT_RECOVER;
2634 iscsit_reject_cmd(cmd,
2635 ISCSI_REASON_DATA_DIGEST_ERROR,
2636 (unsigned char *)hdr);
2637 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2640 pr_debug("Got CRC32C DataDigest 0x%08x for"
2641 " %u bytes of Immediate Data\n", checksum,
2646 cmd->write_data_done += length;
2648 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2649 spin_lock_bh(&cmd->istate_lock);
2650 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2651 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2652 spin_unlock_bh(&cmd->istate_lock);
2655 return IMMEDIATE_DATA_NORMAL_OPERATION;
2659 * Called with sess->conn_lock held.
2661 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2662 with active network interface */
2663 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2665 struct iscsi_cmd *cmd;
2666 struct iscsi_conn *conn_p;
2670 * Only send a Asynchronous Message on connections whos network
2671 * interface is still functional.
2673 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2674 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2675 iscsit_inc_conn_usage_count(conn_p);
2684 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2686 iscsit_dec_conn_usage_count(conn_p);
2690 cmd->logout_cid = conn->cid;
2691 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2692 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2694 spin_lock_bh(&conn_p->cmd_lock);
2695 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2696 spin_unlock_bh(&conn_p->cmd_lock);
2698 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2699 iscsit_dec_conn_usage_count(conn_p);
2702 static int iscsit_send_conn_drop_async_message(
2703 struct iscsi_cmd *cmd,
2704 struct iscsi_conn *conn)
2706 struct iscsi_async *hdr;
2708 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2710 hdr = (struct iscsi_async *) cmd->pdu;
2711 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2712 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2713 cmd->init_task_tag = RESERVED_ITT;
2714 cmd->targ_xfer_tag = 0xFFFFFFFF;
2715 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2716 cmd->stat_sn = conn->stat_sn++;
2717 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2718 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2719 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2720 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2721 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2722 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2723 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2725 pr_debug("Sending Connection Dropped Async Message StatSN:"
2726 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2727 cmd->logout_cid, conn->cid);
2729 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2732 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2734 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2735 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2736 wait_for_completion_interruptible_timeout(
2737 &conn->tx_half_close_comp,
2738 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2743 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2744 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2747 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2748 hdr->flags = datain->flags;
2749 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2750 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2751 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2752 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2753 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2754 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2755 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2758 hton24(hdr->dlength, datain->length);
2759 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2760 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2761 (struct scsi_lun *)&hdr->lun);
2763 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2765 hdr->itt = cmd->init_task_tag;
2767 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2768 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2770 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2772 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2774 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2776 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2777 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2778 hdr->datasn = cpu_to_be32(datain->data_sn);
2779 hdr->offset = cpu_to_be32(datain->offset);
2781 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2782 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2783 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2784 ntohl(hdr->offset), datain->length, conn->cid);
2786 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2788 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2790 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2791 struct iscsi_datain datain;
2792 struct iscsi_datain_req *dr;
2794 bool set_statsn = false;
2796 memset(&datain, 0, sizeof(struct iscsi_datain));
2797 dr = iscsit_get_datain_values(cmd, &datain);
2799 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2800 cmd->init_task_tag);
2804 * Be paranoid and double check the logic for now.
2806 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2807 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2808 " datain.length: %u exceeds cmd->data_length: %u\n",
2809 cmd->init_task_tag, datain.offset, datain.length,
2810 cmd->se_cmd.data_length);
2814 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2816 * Special case for successfully execution w/ both DATAIN
2819 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2820 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2821 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2823 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2824 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2825 iscsit_increment_maxcmdsn(cmd, conn->sess);
2826 cmd->stat_sn = conn->stat_sn++;
2828 } else if (dr->dr_complete ==
2829 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2833 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2835 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2839 if (dr->dr_complete) {
2840 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2842 iscsit_free_datain_req(cmd, dr);
2849 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2850 struct iscsi_logout_rsp *hdr)
2852 struct iscsi_conn *logout_conn = NULL;
2853 struct iscsi_conn_recovery *cr = NULL;
2854 struct iscsi_session *sess = conn->sess;
2856 * The actual shutting down of Sessions and/or Connections
2857 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2858 * is done in scsi_logout_post_handler().
2860 switch (cmd->logout_reason) {
2861 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2862 pr_debug("iSCSI session logout successful, setting"
2863 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2864 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2866 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2867 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2870 * For CLOSECONNECTION logout requests carrying
2871 * a matching logout CID -> local CID, the reference
2872 * for the local CID will have been incremented in
2873 * iscsi_logout_closeconnection().
2875 * For CLOSECONNECTION logout requests carrying
2876 * a different CID than the connection it arrived
2877 * on, the connection responding to cmd->logout_cid
2878 * is stopped in iscsit_logout_post_handler_diffcid().
2881 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2882 " successful.\n", cmd->logout_cid, conn->cid);
2883 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2885 case ISCSI_LOGOUT_REASON_RECOVERY:
2886 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2887 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2890 * If the connection is still active from our point of view
2891 * force connection recovery to occur.
2893 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2896 iscsit_connection_reinstatement_rcfr(logout_conn);
2897 iscsit_dec_conn_usage_count(logout_conn);
2900 cr = iscsit_get_inactive_connection_recovery_entry(
2901 conn->sess, cmd->logout_cid);
2903 pr_err("Unable to locate CID: %hu for"
2904 " REMOVECONNFORRECOVERY Logout Request.\n",
2906 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2910 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2912 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2913 " for recovery for CID: %hu on CID: %hu successful.\n",
2914 cmd->logout_cid, conn->cid);
2915 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2918 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2919 cmd->logout_reason);
2923 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2924 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2925 hdr->response = cmd->logout_response;
2926 hdr->itt = cmd->init_task_tag;
2927 cmd->stat_sn = conn->stat_sn++;
2928 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2930 iscsit_increment_maxcmdsn(cmd, conn->sess);
2931 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2932 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2934 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2935 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2936 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2937 cmd->logout_cid, conn->cid);
2941 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2944 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2948 rc = iscsit_build_logout_rsp(cmd, conn,
2949 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2953 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2957 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2958 struct iscsi_nopin *hdr, bool nopout_response)
2960 hdr->opcode = ISCSI_OP_NOOP_IN;
2961 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2962 hton24(hdr->dlength, cmd->buf_ptr_size);
2963 if (nopout_response)
2964 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2965 hdr->itt = cmd->init_task_tag;
2966 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2967 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2969 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2971 if (nopout_response)
2972 iscsit_increment_maxcmdsn(cmd, conn->sess);
2974 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2975 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2977 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2978 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2979 "Solicited" : "Unsolicited", cmd->init_task_tag,
2980 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2982 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2985 * Unsolicited NOPIN, either requesting a response or not.
2987 static int iscsit_send_unsolicited_nopin(
2988 struct iscsi_cmd *cmd,
2989 struct iscsi_conn *conn,
2992 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2995 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2997 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2998 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3000 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3004 spin_lock_bh(&cmd->istate_lock);
3005 cmd->i_state = want_response ?
3006 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3007 spin_unlock_bh(&cmd->istate_lock);
3013 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3015 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3017 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3020 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3021 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3023 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3025 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3030 static int iscsit_send_r2t(
3031 struct iscsi_cmd *cmd,
3032 struct iscsi_conn *conn)
3034 struct iscsi_r2t *r2t;
3035 struct iscsi_r2t_rsp *hdr;
3038 r2t = iscsit_get_r2t_from_list(cmd);
3042 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3043 memset(hdr, 0, ISCSI_HDR_LEN);
3044 hdr->opcode = ISCSI_OP_R2T;
3045 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3046 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3047 (struct scsi_lun *)&hdr->lun);
3048 hdr->itt = cmd->init_task_tag;
3049 if (conn->conn_transport->iscsit_get_r2t_ttt)
3050 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3052 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3053 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3054 hdr->statsn = cpu_to_be32(conn->stat_sn);
3055 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3056 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3057 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3058 hdr->data_offset = cpu_to_be32(r2t->offset);
3059 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3061 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3062 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3063 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3064 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3065 r2t->offset, r2t->xfer_len, conn->cid);
3067 spin_lock_bh(&cmd->r2t_lock);
3069 spin_unlock_bh(&cmd->r2t_lock);
3071 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3076 spin_lock_bh(&cmd->dataout_timeout_lock);
3077 iscsit_start_dataout_timer(cmd, conn);
3078 spin_unlock_bh(&cmd->dataout_timeout_lock);
3084 * @recovery: If called from iscsi_task_reassign_complete_write() for
3085 * connection recovery.
3087 int iscsit_build_r2ts_for_cmd(
3088 struct iscsi_conn *conn,
3089 struct iscsi_cmd *cmd,
3093 u32 offset = 0, xfer_len = 0;
3095 spin_lock_bh(&cmd->r2t_lock);
3096 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3097 spin_unlock_bh(&cmd->r2t_lock);
3101 if (conn->sess->sess_ops->DataSequenceInOrder &&
3103 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3105 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3106 if (conn->sess->sess_ops->DataSequenceInOrder) {
3107 offset = cmd->r2t_offset;
3109 if (first_r2t && recovery) {
3110 int new_data_end = offset +
3111 conn->sess->sess_ops->MaxBurstLength -
3112 cmd->next_burst_len;
3114 if (new_data_end > cmd->se_cmd.data_length)
3115 xfer_len = cmd->se_cmd.data_length - offset;
3118 conn->sess->sess_ops->MaxBurstLength -
3119 cmd->next_burst_len;
3121 int new_data_end = offset +
3122 conn->sess->sess_ops->MaxBurstLength;
3124 if (new_data_end > cmd->se_cmd.data_length)
3125 xfer_len = cmd->se_cmd.data_length - offset;
3127 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3129 cmd->r2t_offset += xfer_len;
3131 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3132 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3134 struct iscsi_seq *seq;
3136 seq = iscsit_get_seq_holder_for_r2t(cmd);
3138 spin_unlock_bh(&cmd->r2t_lock);
3142 offset = seq->offset;
3143 xfer_len = seq->xfer_len;
3145 if (cmd->seq_send_order == cmd->seq_count)
3146 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3148 cmd->outstanding_r2ts++;
3151 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3152 spin_unlock_bh(&cmd->r2t_lock);
3156 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3159 spin_unlock_bh(&cmd->r2t_lock);
3163 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3165 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3166 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3169 cmd->stat_sn = conn->stat_sn++;
3171 atomic_long_inc(&conn->sess->rsp_pdus);
3173 memset(hdr, 0, ISCSI_HDR_LEN);
3174 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3175 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3176 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3177 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3178 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3179 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3180 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3181 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3183 hdr->response = cmd->iscsi_response;
3184 hdr->cmd_status = cmd->se_cmd.scsi_status;
3185 hdr->itt = cmd->init_task_tag;
3186 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3188 iscsit_increment_maxcmdsn(cmd, conn->sess);
3189 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3190 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3192 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3193 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3194 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3195 cmd->se_cmd.scsi_status, conn->cid);
3197 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3199 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3201 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3202 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3203 void *data_buf = NULL;
3204 u32 padding = 0, data_buf_len = 0;
3206 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3209 * Attach SENSE DATA payload to iSCSI Response PDU
3211 if (cmd->se_cmd.sense_buffer &&
3212 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3213 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3214 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3215 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3217 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3218 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3219 data_buf = cmd->sense_buffer;
3220 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3223 memset(cmd->sense_buffer +
3224 cmd->se_cmd.scsi_sense_length, 0, padding);
3225 pr_debug("Adding %u bytes of padding to"
3226 " SENSE.\n", padding);
3229 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3231 cmd->se_cmd.scsi_sense_length);
3234 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3238 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3240 switch (se_tmr->response) {
3241 case TMR_FUNCTION_COMPLETE:
3242 return ISCSI_TMF_RSP_COMPLETE;
3243 case TMR_TASK_DOES_NOT_EXIST:
3244 return ISCSI_TMF_RSP_NO_TASK;
3245 case TMR_LUN_DOES_NOT_EXIST:
3246 return ISCSI_TMF_RSP_NO_LUN;
3247 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3248 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3249 case TMR_FUNCTION_REJECTED:
3251 return ISCSI_TMF_RSP_REJECTED;
3256 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3257 struct iscsi_tm_rsp *hdr)
3259 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3261 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3262 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3263 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3264 hdr->itt = cmd->init_task_tag;
3265 cmd->stat_sn = conn->stat_sn++;
3266 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3268 iscsit_increment_maxcmdsn(cmd, conn->sess);
3269 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3270 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3272 pr_debug("Built Task Management Response ITT: 0x%08x,"
3273 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3274 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3276 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3279 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3281 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3283 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3285 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3288 #define SENDTARGETS_BUF_LIMIT 32768U
3291 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3292 enum iscsit_transport_type network_transport,
3293 int skip_bytes, bool *completed)
3295 char *payload = NULL;
3296 struct iscsi_conn *conn = cmd->conn;
3297 struct iscsi_portal_group *tpg;
3298 struct iscsi_tiqn *tiqn;
3299 struct iscsi_tpg_np *tpg_np;
3300 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3301 int target_name_printed;
3302 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3303 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3306 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3307 SENDTARGETS_BUF_LIMIT);
3309 payload = kzalloc(buffer_len, GFP_KERNEL);
3314 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3317 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3318 text_ptr = strchr(text_in, '=');
3320 pr_err("Unable to locate '=' string in text_in:"
3326 * Skip over '=' character..
3331 spin_lock(&tiqn_lock);
3332 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3333 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3334 strcmp(tiqn->tiqn, text_ptr)) {
3338 target_name_printed = 0;
3340 spin_lock(&tiqn->tiqn_tpg_lock);
3341 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3343 /* If demo_mode_discovery=0 and generate_node_acls=0
3344 * (demo mode dislabed) do not return
3345 * TargetName+TargetAddress unless a NodeACL exists.
3348 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3349 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3350 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3351 cmd->conn->sess->sess_ops->InitiatorName))) {
3355 spin_lock(&tpg->tpg_state_lock);
3356 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3357 spin_unlock(&tpg->tpg_state_lock);
3359 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3362 spin_lock(&tpg->tpg_np_lock);
3363 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3365 struct iscsi_np *np = tpg_np->tpg_np;
3366 struct sockaddr_storage *sockaddr;
3368 if (np->np_network_transport != network_transport)
3371 if (!target_name_printed) {
3372 len = sprintf(buf, "TargetName=%s",
3376 if ((len + payload_len) > buffer_len) {
3377 spin_unlock(&tpg->tpg_np_lock);
3378 spin_unlock(&tiqn->tiqn_tpg_lock);
3383 if (skip_bytes && len <= skip_bytes) {
3386 memcpy(payload + payload_len, buf, len);
3388 target_name_printed = 1;
3389 if (len > skip_bytes)
3394 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3395 sockaddr = &conn->local_sockaddr;
3397 sockaddr = &np->np_sockaddr;
3399 len = sprintf(buf, "TargetAddress="
3405 if ((len + payload_len) > buffer_len) {
3406 spin_unlock(&tpg->tpg_np_lock);
3407 spin_unlock(&tiqn->tiqn_tpg_lock);
3412 if (skip_bytes && len <= skip_bytes) {
3415 memcpy(payload + payload_len, buf, len);
3417 if (len > skip_bytes)
3421 spin_unlock(&tpg->tpg_np_lock);
3423 spin_unlock(&tiqn->tiqn_tpg_lock);
3430 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3433 spin_unlock(&tiqn_lock);
3435 cmd->buf_ptr = payload;
3441 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3442 struct iscsi_text_rsp *hdr,
3443 enum iscsit_transport_type network_transport)
3445 int text_length, padding;
3446 bool completed = true;
3448 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3449 cmd->read_data_done,
3451 if (text_length < 0)
3455 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3457 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3458 cmd->read_data_done += text_length;
3459 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3460 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3462 hdr->opcode = ISCSI_OP_TEXT_RSP;
3463 padding = ((-text_length) & 3);
3464 hton24(hdr->dlength, text_length);
3465 hdr->itt = cmd->init_task_tag;
3466 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3467 cmd->stat_sn = conn->stat_sn++;
3468 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3470 iscsit_increment_maxcmdsn(cmd, conn->sess);
3472 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3473 * correctly increment MaxCmdSN for each response answering a
3474 * non immediate text request with a valid CmdSN.
3476 cmd->maxcmdsn_inc = 0;
3477 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3478 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3480 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3481 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3482 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3483 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3484 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3486 return text_length + padding;
3488 EXPORT_SYMBOL(iscsit_build_text_rsp);
3490 static int iscsit_send_text_rsp(
3491 struct iscsi_cmd *cmd,
3492 struct iscsi_conn *conn)
3494 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3497 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3498 conn->conn_transport->transport_type);
3499 if (text_length < 0)
3502 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3508 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3509 struct iscsi_reject *hdr)
3511 hdr->opcode = ISCSI_OP_REJECT;
3512 hdr->reason = cmd->reject_reason;
3513 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3514 hton24(hdr->dlength, ISCSI_HDR_LEN);
3515 hdr->ffffffff = cpu_to_be32(0xffffffff);
3516 cmd->stat_sn = conn->stat_sn++;
3517 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3518 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3519 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3522 EXPORT_SYMBOL(iscsit_build_reject);
3524 static int iscsit_send_reject(
3525 struct iscsi_cmd *cmd,
3526 struct iscsi_conn *conn)
3528 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3530 iscsit_build_reject(cmd, conn, hdr);
3532 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3533 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3535 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3540 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3544 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3545 * within iscsit_start_kthreads()
3547 * Here we use bitmap_id to determine which CPU that this
3548 * iSCSI connection's RX/TX threads will be scheduled to
3551 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3552 for_each_online_cpu(cpu) {
3554 cpumask_set_cpu(cpu, conn->conn_cpumask);
3559 * This should never be reached..
3562 cpumask_setall(conn->conn_cpumask);
3566 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3571 case ISTATE_SEND_R2T:
3572 ret = iscsit_send_r2t(cmd, conn);
3577 spin_lock_bh(&conn->cmd_lock);
3578 list_del_init(&cmd->i_conn_node);
3579 spin_unlock_bh(&conn->cmd_lock);
3581 iscsit_free_cmd(cmd, false);
3583 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3584 iscsit_mod_nopin_response_timer(conn);
3585 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3589 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3590 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3595 pr_err("Unknown Opcode: 0x%02x ITT:"
3596 " 0x%08x, i_state: %d on CID: %hu\n",
3597 cmd->iscsi_opcode, cmd->init_task_tag, state,
3607 EXPORT_SYMBOL(iscsit_immediate_queue);
3610 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3612 struct iscsit_transport *t = conn->conn_transport;
3613 struct iscsi_queue_req *qr;
3614 struct iscsi_cmd *cmd;
3618 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3619 atomic_set(&conn->check_immediate_queue, 0);
3622 kmem_cache_free(lio_qr_cache, qr);
3624 ret = t->iscsit_immediate_queue(conn, cmd, state);
3633 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3639 case ISTATE_SEND_DATAIN:
3640 ret = iscsit_send_datain(cmd, conn);
3645 goto check_rsp_state;
3646 else if (ret == 1) {
3648 spin_lock_bh(&cmd->istate_lock);
3649 cmd->i_state = ISTATE_SENT_STATUS;
3650 spin_unlock_bh(&cmd->istate_lock);
3652 if (atomic_read(&conn->check_immediate_queue))
3656 } else if (ret == 2) {
3657 /* Still must send status,
3658 SCF_TRANSPORT_TASK_SENSE was set */
3659 spin_lock_bh(&cmd->istate_lock);
3660 cmd->i_state = ISTATE_SEND_STATUS;
3661 spin_unlock_bh(&cmd->istate_lock);
3662 state = ISTATE_SEND_STATUS;
3663 goto check_rsp_state;
3667 case ISTATE_SEND_STATUS:
3668 case ISTATE_SEND_STATUS_RECOVERY:
3669 ret = iscsit_send_response(cmd, conn);
3671 case ISTATE_SEND_LOGOUTRSP:
3672 ret = iscsit_send_logout(cmd, conn);
3674 case ISTATE_SEND_ASYNCMSG:
3675 ret = iscsit_send_conn_drop_async_message(
3678 case ISTATE_SEND_NOPIN:
3679 ret = iscsit_send_nopin(cmd, conn);
3681 case ISTATE_SEND_REJECT:
3682 ret = iscsit_send_reject(cmd, conn);
3684 case ISTATE_SEND_TASKMGTRSP:
3685 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3688 ret = iscsit_tmr_post_handler(cmd, conn);
3690 iscsit_fall_back_to_erl0(conn->sess);
3692 case ISTATE_SEND_TEXTRSP:
3693 ret = iscsit_send_text_rsp(cmd, conn);
3696 pr_err("Unknown Opcode: 0x%02x ITT:"
3697 " 0x%08x, i_state: %d on CID: %hu\n",
3698 cmd->iscsi_opcode, cmd->init_task_tag,
3706 case ISTATE_SEND_LOGOUTRSP:
3707 if (!iscsit_logout_post_handler(cmd, conn))
3710 case ISTATE_SEND_STATUS:
3711 case ISTATE_SEND_ASYNCMSG:
3712 case ISTATE_SEND_NOPIN:
3713 case ISTATE_SEND_STATUS_RECOVERY:
3714 case ISTATE_SEND_TEXTRSP:
3715 case ISTATE_SEND_TASKMGTRSP:
3716 case ISTATE_SEND_REJECT:
3717 spin_lock_bh(&cmd->istate_lock);
3718 cmd->i_state = ISTATE_SENT_STATUS;
3719 spin_unlock_bh(&cmd->istate_lock);
3722 pr_err("Unknown Opcode: 0x%02x ITT:"
3723 " 0x%08x, i_state: %d on CID: %hu\n",
3724 cmd->iscsi_opcode, cmd->init_task_tag,
3725 cmd->i_state, conn->cid);
3729 if (atomic_read(&conn->check_immediate_queue))
3737 EXPORT_SYMBOL(iscsit_response_queue);
3739 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3741 struct iscsit_transport *t = conn->conn_transport;
3742 struct iscsi_queue_req *qr;
3743 struct iscsi_cmd *cmd;
3747 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3750 kmem_cache_free(lio_qr_cache, qr);
3752 ret = t->iscsit_response_queue(conn, cmd, state);
3753 if (ret == 1 || ret < 0)
3760 int iscsi_target_tx_thread(void *arg)
3763 struct iscsi_conn *conn = arg;
3764 bool conn_freed = false;
3767 * Allow ourselves to be interrupted by SIGINT so that a
3768 * connection recovery / failure event can be triggered externally.
3770 allow_signal(SIGINT);
3772 while (!kthread_should_stop()) {
3774 * Ensure that both TX and RX per connection kthreads
3775 * are scheduled to run on the same CPU.
3777 iscsit_thread_check_cpumask(conn, current, 1);
3779 wait_event_interruptible(conn->queues_wq,
3780 !iscsit_conn_all_queues_empty(conn));
3782 if (signal_pending(current))
3786 ret = iscsit_handle_immediate_queue(conn);
3790 ret = iscsit_handle_response_queue(conn);
3793 } else if (ret == -ECONNRESET) {
3796 } else if (ret < 0) {
3803 * Avoid the normal connection failure code-path if this connection
3804 * is still within LOGIN mode, and iscsi_np process context is
3805 * responsible for cleaning up the early connection failure.
3807 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3808 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3811 while (!kthread_should_stop()) {
3818 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3820 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3821 struct iscsi_cmd *cmd;
3824 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3825 case ISCSI_OP_SCSI_CMD:
3826 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3830 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3832 case ISCSI_OP_SCSI_DATA_OUT:
3833 ret = iscsit_handle_data_out(conn, buf);
3835 case ISCSI_OP_NOOP_OUT:
3837 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3838 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3842 ret = iscsit_handle_nop_out(conn, cmd, buf);
3844 case ISCSI_OP_SCSI_TMFUNC:
3845 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3849 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3852 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3853 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3857 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3864 case ISCSI_OP_LOGOUT:
3865 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3869 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3871 wait_for_completion_timeout(&conn->conn_logout_comp,
3872 SECONDS_FOR_LOGOUT_COMP * HZ);
3874 case ISCSI_OP_SNACK:
3875 ret = iscsit_handle_snack(conn, buf);
3878 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3879 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3880 pr_err("Cannot recover from unknown"
3881 " opcode while ERL=0, closing iSCSI connection.\n");
3884 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3885 " closing iSCSI connection.\n");
3892 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3895 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3899 spin_lock_bh(&conn->state_lock);
3900 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3901 spin_unlock_bh(&conn->state_lock);
3906 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3910 u32 checksum = 0, digest = 0;
3913 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3917 while (!kthread_should_stop()) {
3919 * Ensure that both TX and RX per connection kthreads
3920 * are scheduled to run on the same CPU.
3922 iscsit_thread_check_cpumask(conn, current, 0);
3924 memset(&iov, 0, sizeof(struct kvec));
3926 iov.iov_base = buffer;
3927 iov.iov_len = ISCSI_HDR_LEN;
3929 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3930 if (ret != ISCSI_HDR_LEN) {
3931 iscsit_rx_thread_wait_for_tcp(conn);
3935 if (conn->conn_ops->HeaderDigest) {
3936 iov.iov_base = &digest;
3937 iov.iov_len = ISCSI_CRC_LEN;
3939 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3940 if (ret != ISCSI_CRC_LEN) {
3941 iscsit_rx_thread_wait_for_tcp(conn);
3945 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3946 ISCSI_HDR_LEN, 0, NULL,
3949 if (digest != checksum) {
3950 pr_err("HeaderDigest CRC32C failed,"
3951 " received 0x%08x, computed 0x%08x\n",
3954 * Set the PDU to 0xff so it will intentionally
3955 * hit default in the switch below.
3957 memset(buffer, 0xff, ISCSI_HDR_LEN);
3958 atomic_long_inc(&conn->sess->conn_digest_errors);
3960 pr_debug("Got HeaderDigest CRC32C"
3961 " 0x%08x\n", checksum);
3965 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3968 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3970 if (conn->sess->sess_ops->SessionType &&
3971 ((!(opcode & ISCSI_OP_TEXT)) ||
3972 (!(opcode & ISCSI_OP_LOGOUT)))) {
3973 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3974 " while in Discovery Session, rejecting.\n", opcode);
3975 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3980 ret = iscsi_target_rx_opcode(conn, buffer);
3988 int iscsi_target_rx_thread(void *arg)
3991 struct iscsi_conn *conn = arg;
3992 bool conn_freed = false;
3995 * Allow ourselves to be interrupted by SIGINT so that a
3996 * connection recovery / failure event can be triggered externally.
3998 allow_signal(SIGINT);
4000 * Wait for iscsi_post_login_handler() to complete before allowing
4001 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4003 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4004 if (rc < 0 || iscsi_target_check_conn_state(conn))
4007 if (!conn->conn_transport->iscsit_get_rx_pdu)
4010 conn->conn_transport->iscsit_get_rx_pdu(conn);
4012 if (!signal_pending(current))
4013 atomic_set(&conn->transport_failed, 1);
4014 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4018 while (!kthread_should_stop()) {
4026 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4028 LIST_HEAD(tmp_list);
4029 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4030 struct iscsi_session *sess = conn->sess;
4032 * We expect this function to only ever be called from either RX or TX
4033 * thread context via iscsit_close_connection() once the other context
4034 * has been reset -> returned sleeping pre-handler state.
4036 spin_lock_bh(&conn->cmd_lock);
4037 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4039 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4040 struct se_cmd *se_cmd = &cmd->se_cmd;
4042 if (se_cmd->se_tfo != NULL) {
4043 spin_lock(&se_cmd->t_state_lock);
4044 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4045 spin_unlock(&se_cmd->t_state_lock);
4048 spin_unlock_bh(&conn->cmd_lock);
4050 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4051 list_del_init(&cmd->i_conn_node);
4053 iscsit_increment_maxcmdsn(cmd, sess);
4054 iscsit_free_cmd(cmd, true);
4059 static void iscsit_stop_timers_for_cmds(
4060 struct iscsi_conn *conn)
4062 struct iscsi_cmd *cmd;
4064 spin_lock_bh(&conn->cmd_lock);
4065 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4066 if (cmd->data_direction == DMA_TO_DEVICE)
4067 iscsit_stop_dataout_timer(cmd);
4069 spin_unlock_bh(&conn->cmd_lock);
4072 int iscsit_close_connection(
4073 struct iscsi_conn *conn)
4075 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4076 struct iscsi_session *sess = conn->sess;
4078 pr_debug("Closing iSCSI connection CID %hu on SID:"
4079 " %u\n", conn->cid, sess->sid);
4081 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4082 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4083 * sleeping and the logout response never got sent because the
4084 * connection failed.
4086 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4087 * to signal logout response TX interrupt completion. Go ahead and skip
4088 * this for iser since isert_rx_opcode() does not wait on logout failure,
4089 * and to avoid iscsi_conn pointer dereference in iser-target code.
4091 if (!conn->conn_transport->rdma_shutdown)
4092 complete(&conn->conn_logout_comp);
4094 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4095 if (conn->tx_thread &&
4096 cmpxchg(&conn->tx_thread_active, true, false)) {
4097 send_sig(SIGINT, conn->tx_thread, 1);
4098 kthread_stop(conn->tx_thread);
4100 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4101 if (conn->rx_thread &&
4102 cmpxchg(&conn->rx_thread_active, true, false)) {
4103 send_sig(SIGINT, conn->rx_thread, 1);
4104 kthread_stop(conn->rx_thread);
4108 spin_lock(&iscsit_global->ts_bitmap_lock);
4109 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4111 spin_unlock(&iscsit_global->ts_bitmap_lock);
4113 iscsit_stop_timers_for_cmds(conn);
4114 iscsit_stop_nopin_response_timer(conn);
4115 iscsit_stop_nopin_timer(conn);
4117 if (conn->conn_transport->iscsit_wait_conn)
4118 conn->conn_transport->iscsit_wait_conn(conn);
4121 * During Connection recovery drop unacknowledged out of order
4122 * commands for this connection, and prepare the other commands
4125 * During normal operation clear the out of order commands (but
4126 * do not free the struct iscsi_ooo_cmdsn's) and release all
4127 * struct iscsi_cmds.
4129 if (atomic_read(&conn->connection_recovery)) {
4130 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4131 iscsit_prepare_cmds_for_reallegiance(conn);
4133 iscsit_clear_ooo_cmdsns_for_conn(conn);
4134 iscsit_release_commands_from_conn(conn);
4136 iscsit_free_queue_reqs_for_conn(conn);
4139 * Handle decrementing session or connection usage count if
4140 * a logout response was not able to be sent because the
4141 * connection failed. Fall back to Session Recovery here.
4143 if (atomic_read(&conn->conn_logout_remove)) {
4144 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4145 iscsit_dec_conn_usage_count(conn);
4146 iscsit_dec_session_usage_count(sess);
4148 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4149 iscsit_dec_conn_usage_count(conn);
4151 atomic_set(&conn->conn_logout_remove, 0);
4152 atomic_set(&sess->session_reinstatement, 0);
4153 atomic_set(&sess->session_fall_back_to_erl0, 1);
4156 spin_lock_bh(&sess->conn_lock);
4157 list_del(&conn->conn_list);
4160 * Attempt to let the Initiator know this connection failed by
4161 * sending an Connection Dropped Async Message on another
4162 * active connection.
4164 if (atomic_read(&conn->connection_recovery))
4165 iscsit_build_conn_drop_async_message(conn);
4167 spin_unlock_bh(&sess->conn_lock);
4170 * If connection reinstatement is being performed on this connection,
4171 * up the connection reinstatement semaphore that is being blocked on
4172 * in iscsit_cause_connection_reinstatement().
4174 spin_lock_bh(&conn->state_lock);
4175 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4176 spin_unlock_bh(&conn->state_lock);
4177 complete(&conn->conn_wait_comp);
4178 wait_for_completion(&conn->conn_post_wait_comp);
4179 spin_lock_bh(&conn->state_lock);
4183 * If connection reinstatement is being performed on this connection
4184 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4185 * connection wait rcfr semaphore that is being blocked on
4186 * an iscsit_connection_reinstatement_rcfr().
4188 if (atomic_read(&conn->connection_wait_rcfr)) {
4189 spin_unlock_bh(&conn->state_lock);
4190 complete(&conn->conn_wait_rcfr_comp);
4191 wait_for_completion(&conn->conn_post_wait_comp);
4192 spin_lock_bh(&conn->state_lock);
4194 atomic_set(&conn->connection_reinstatement, 1);
4195 spin_unlock_bh(&conn->state_lock);
4198 * If any other processes are accessing this connection pointer we
4199 * must wait until they have completed.
4201 iscsit_check_conn_usage_count(conn);
4203 ahash_request_free(conn->conn_tx_hash);
4204 if (conn->conn_rx_hash) {
4205 struct crypto_ahash *tfm;
4207 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4208 ahash_request_free(conn->conn_rx_hash);
4209 crypto_free_ahash(tfm);
4213 sock_release(conn->sock);
4215 if (conn->conn_transport->iscsit_free_conn)
4216 conn->conn_transport->iscsit_free_conn(conn);
4218 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4219 conn->conn_state = TARG_CONN_STATE_FREE;
4220 iscsit_free_conn(conn);
4222 spin_lock_bh(&sess->conn_lock);
4223 atomic_dec(&sess->nconn);
4224 pr_debug("Decremented iSCSI connection count to %hu from node:"
4225 " %s\n", atomic_read(&sess->nconn),
4226 sess->sess_ops->InitiatorName);
4228 * Make sure that if one connection fails in an non ERL=2 iSCSI
4229 * Session that they all fail.
4231 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4232 !atomic_read(&sess->session_logout))
4233 atomic_set(&sess->session_fall_back_to_erl0, 1);
4236 * If this was not the last connection in the session, and we are
4237 * performing session reinstatement or falling back to ERL=0, call
4238 * iscsit_stop_session() without sleeping to shutdown the other
4239 * active connections.
4241 if (atomic_read(&sess->nconn)) {
4242 if (!atomic_read(&sess->session_reinstatement) &&
4243 !atomic_read(&sess->session_fall_back_to_erl0)) {
4244 spin_unlock_bh(&sess->conn_lock);
4247 if (!atomic_read(&sess->session_stop_active)) {
4248 atomic_set(&sess->session_stop_active, 1);
4249 spin_unlock_bh(&sess->conn_lock);
4250 iscsit_stop_session(sess, 0, 0);
4253 spin_unlock_bh(&sess->conn_lock);
4258 * If this was the last connection in the session and one of the
4259 * following is occurring:
4261 * Session Reinstatement is not being performed, and are falling back
4262 * to ERL=0 call iscsit_close_session().
4264 * Session Logout was requested. iscsit_close_session() will be called
4267 * Session Continuation is not being performed, start the Time2Retain
4268 * handler and check if sleep_on_sess_wait_sem is active.
4270 if (!atomic_read(&sess->session_reinstatement) &&
4271 atomic_read(&sess->session_fall_back_to_erl0)) {
4272 spin_unlock_bh(&sess->conn_lock);
4273 iscsit_close_session(sess);
4276 } else if (atomic_read(&sess->session_logout)) {
4277 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4278 sess->session_state = TARG_SESS_STATE_FREE;
4279 spin_unlock_bh(&sess->conn_lock);
4281 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4282 complete(&sess->session_wait_comp);
4286 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4287 sess->session_state = TARG_SESS_STATE_FAILED;
4289 if (!atomic_read(&sess->session_continuation)) {
4290 spin_unlock_bh(&sess->conn_lock);
4291 iscsit_start_time2retain_handler(sess);
4293 spin_unlock_bh(&sess->conn_lock);
4295 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4296 complete(&sess->session_wait_comp);
4303 * If the iSCSI Session for the iSCSI Initiator Node exists,
4304 * forcefully shutdown the iSCSI NEXUS.
4306 int iscsit_close_session(struct iscsi_session *sess)
4308 struct iscsi_portal_group *tpg = sess->tpg;
4309 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4311 if (atomic_read(&sess->nconn)) {
4312 pr_err("%d connection(s) still exist for iSCSI session"
4313 " to %s\n", atomic_read(&sess->nconn),
4314 sess->sess_ops->InitiatorName);
4318 spin_lock_bh(&se_tpg->session_lock);
4319 atomic_set(&sess->session_logout, 1);
4320 atomic_set(&sess->session_reinstatement, 1);
4321 iscsit_stop_time2retain_timer(sess);
4322 spin_unlock_bh(&se_tpg->session_lock);
4325 * transport_deregister_session_configfs() will clear the
4326 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4327 * can be setting it again with __transport_register_session() in
4328 * iscsi_post_login_handler() again after the iscsit_stop_session()
4329 * completes in iscsi_np context.
4331 transport_deregister_session_configfs(sess->se_sess);
4334 * If any other processes are accessing this session pointer we must
4335 * wait until they have completed. If we are in an interrupt (the
4336 * time2retain handler) and contain and active session usage count we
4337 * restart the timer and exit.
4339 if (!in_interrupt()) {
4340 if (iscsit_check_session_usage_count(sess) == 1)
4341 iscsit_stop_session(sess, 1, 1);
4343 if (iscsit_check_session_usage_count(sess) == 2) {
4344 atomic_set(&sess->session_logout, 0);
4345 iscsit_start_time2retain_handler(sess);
4350 transport_deregister_session(sess->se_sess);
4352 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4353 iscsit_free_connection_recovery_entries(sess);
4355 iscsit_free_all_ooo_cmdsns(sess);
4357 spin_lock_bh(&se_tpg->session_lock);
4358 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4359 sess->session_state = TARG_SESS_STATE_FREE;
4360 pr_debug("Released iSCSI session from node: %s\n",
4361 sess->sess_ops->InitiatorName);
4364 tpg->tpg_tiqn->tiqn_nsessions--;
4366 pr_debug("Decremented number of active iSCSI Sessions on"
4367 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4369 ida_free(&sess_ida, sess->session_index);
4370 kfree(sess->sess_ops);
4371 sess->sess_ops = NULL;
4372 spin_unlock_bh(&se_tpg->session_lock);
4378 static void iscsit_logout_post_handler_closesession(
4379 struct iscsi_conn *conn)
4381 struct iscsi_session *sess = conn->sess;
4384 * Traditional iscsi/tcp will invoke this logic from TX thread
4385 * context during session logout, so clear tx_thread_active and
4386 * sleep if iscsit_close_connection() has not already occured.
4388 * Since iser-target invokes this logic from it's own workqueue,
4389 * always sleep waiting for RX/TX thread shutdown to complete
4390 * within iscsit_close_connection().
4392 if (!conn->conn_transport->rdma_shutdown) {
4393 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4398 atomic_set(&conn->conn_logout_remove, 0);
4399 complete(&conn->conn_logout_comp);
4401 iscsit_dec_conn_usage_count(conn);
4402 iscsit_stop_session(sess, sleep, sleep);
4403 iscsit_dec_session_usage_count(sess);
4404 iscsit_close_session(sess);
4407 static void iscsit_logout_post_handler_samecid(
4408 struct iscsi_conn *conn)
4412 if (!conn->conn_transport->rdma_shutdown) {
4413 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4418 atomic_set(&conn->conn_logout_remove, 0);
4419 complete(&conn->conn_logout_comp);
4421 iscsit_cause_connection_reinstatement(conn, sleep);
4422 iscsit_dec_conn_usage_count(conn);
4425 static void iscsit_logout_post_handler_diffcid(
4426 struct iscsi_conn *conn,
4429 struct iscsi_conn *l_conn;
4430 struct iscsi_session *sess = conn->sess;
4431 bool conn_found = false;
4436 spin_lock_bh(&sess->conn_lock);
4437 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4438 if (l_conn->cid == cid) {
4439 iscsit_inc_conn_usage_count(l_conn);
4444 spin_unlock_bh(&sess->conn_lock);
4450 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4452 spin_lock_bh(&l_conn->state_lock);
4453 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4454 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4455 spin_unlock_bh(&l_conn->state_lock);
4457 iscsit_cause_connection_reinstatement(l_conn, 1);
4458 iscsit_dec_conn_usage_count(l_conn);
4462 * Return of 0 causes the TX thread to restart.
4464 int iscsit_logout_post_handler(
4465 struct iscsi_cmd *cmd,
4466 struct iscsi_conn *conn)
4470 switch (cmd->logout_reason) {
4471 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4472 switch (cmd->logout_response) {
4473 case ISCSI_LOGOUT_SUCCESS:
4474 case ISCSI_LOGOUT_CLEANUP_FAILED:
4476 iscsit_logout_post_handler_closesession(conn);
4481 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4482 if (conn->cid == cmd->logout_cid) {
4483 switch (cmd->logout_response) {
4484 case ISCSI_LOGOUT_SUCCESS:
4485 case ISCSI_LOGOUT_CLEANUP_FAILED:
4487 iscsit_logout_post_handler_samecid(conn);
4492 switch (cmd->logout_response) {
4493 case ISCSI_LOGOUT_SUCCESS:
4494 iscsit_logout_post_handler_diffcid(conn,
4497 case ISCSI_LOGOUT_CID_NOT_FOUND:
4498 case ISCSI_LOGOUT_CLEANUP_FAILED:
4505 case ISCSI_LOGOUT_REASON_RECOVERY:
4506 switch (cmd->logout_response) {
4507 case ISCSI_LOGOUT_SUCCESS:
4508 case ISCSI_LOGOUT_CID_NOT_FOUND:
4509 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4510 case ISCSI_LOGOUT_CLEANUP_FAILED:
4522 EXPORT_SYMBOL(iscsit_logout_post_handler);
4524 void iscsit_fail_session(struct iscsi_session *sess)
4526 struct iscsi_conn *conn;
4528 spin_lock_bh(&sess->conn_lock);
4529 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4530 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4531 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4533 spin_unlock_bh(&sess->conn_lock);
4535 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4536 sess->session_state = TARG_SESS_STATE_FAILED;
4539 int iscsit_free_session(struct iscsi_session *sess)
4541 u16 conn_count = atomic_read(&sess->nconn);
4542 struct iscsi_conn *conn, *conn_tmp = NULL;
4545 spin_lock_bh(&sess->conn_lock);
4546 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4548 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4550 if (conn_count == 0)
4553 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4556 iscsit_inc_conn_usage_count(conn_tmp);
4559 iscsit_inc_conn_usage_count(conn);
4561 spin_unlock_bh(&sess->conn_lock);
4562 iscsit_cause_connection_reinstatement(conn, 1);
4563 spin_lock_bh(&sess->conn_lock);
4565 iscsit_dec_conn_usage_count(conn);
4567 iscsit_dec_conn_usage_count(conn_tmp);
4572 if (atomic_read(&sess->nconn)) {
4573 spin_unlock_bh(&sess->conn_lock);
4574 wait_for_completion(&sess->session_wait_comp);
4576 spin_unlock_bh(&sess->conn_lock);
4578 iscsit_close_session(sess);
4582 void iscsit_stop_session(
4583 struct iscsi_session *sess,
4585 int connection_sleep)
4587 u16 conn_count = atomic_read(&sess->nconn);
4588 struct iscsi_conn *conn, *conn_tmp = NULL;
4591 spin_lock_bh(&sess->conn_lock);
4593 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4595 if (connection_sleep) {
4596 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4598 if (conn_count == 0)
4601 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4604 iscsit_inc_conn_usage_count(conn_tmp);
4607 iscsit_inc_conn_usage_count(conn);
4609 spin_unlock_bh(&sess->conn_lock);
4610 iscsit_cause_connection_reinstatement(conn, 1);
4611 spin_lock_bh(&sess->conn_lock);
4613 iscsit_dec_conn_usage_count(conn);
4615 iscsit_dec_conn_usage_count(conn_tmp);
4619 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4620 iscsit_cause_connection_reinstatement(conn, 0);
4623 if (session_sleep && atomic_read(&sess->nconn)) {
4624 spin_unlock_bh(&sess->conn_lock);
4625 wait_for_completion(&sess->session_wait_comp);
4627 spin_unlock_bh(&sess->conn_lock);
4630 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4632 struct iscsi_session *sess;
4633 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4634 struct se_session *se_sess, *se_sess_tmp;
4635 LIST_HEAD(free_list);
4636 int session_count = 0;
4638 spin_lock_bh(&se_tpg->session_lock);
4639 if (tpg->nsessions && !force) {
4640 spin_unlock_bh(&se_tpg->session_lock);
4644 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4646 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4648 spin_lock(&sess->conn_lock);
4649 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4650 atomic_read(&sess->session_logout) ||
4651 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4652 spin_unlock(&sess->conn_lock);
4655 atomic_set(&sess->session_reinstatement, 1);
4656 atomic_set(&sess->session_fall_back_to_erl0, 1);
4657 spin_unlock(&sess->conn_lock);
4659 list_move_tail(&se_sess->sess_list, &free_list);
4661 spin_unlock_bh(&se_tpg->session_lock);
4663 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4664 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4666 iscsit_free_session(sess);
4670 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4671 " Group: %hu\n", session_count, tpg->tpgt);
4675 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4676 MODULE_VERSION("4.1.x");
4677 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4678 MODULE_LICENSE("GPL");
4680 module_init(iscsi_target_init_module);
4681 module_exit(iscsi_target_cleanup_module);