1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
51 #include <target/iscsi/iscsi_transport.h>
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
58 static struct idr tiqn_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_lock;
63 struct iscsit_global *iscsit_global;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75 struct iscsi_tiqn *tiqn = NULL;
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
88 spin_unlock(&tiqn->tiqn_state_lock);
91 spin_unlock(&tiqn_lock);
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
104 spin_unlock(&tiqn->tiqn_state_lock);
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122 struct iscsi_tiqn *tiqn = NULL;
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
128 return ERR_PTR(-EINVAL);
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
133 return ERR_PTR(-ENOMEM);
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160 spin_unlock(&tiqn_lock);
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172 * Wait for accesses to said struct iscsi_tiqn to end.
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
178 spin_lock(&tiqn->tiqn_state_lock);
180 spin_unlock(&tiqn->tiqn_state_lock);
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
196 iscsit_wait_for_tiqn(tiqn);
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
212 * Determine if the network portal is accepting storage traffic.
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
219 spin_unlock_bh(&np->np_thread_lock);
221 * Determine if the portal group is accepting storage traffic.
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
228 spin_unlock_bh(&tpg->tpg_state_lock);
231 * Here we serialize access across the TIQN+TPG Tuple.
233 ret = down_interruptible(&tpg->np_login_sem);
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
243 spin_unlock_bh(&tpg->tpg_state_lock);
248 void iscsit_login_kref_put(struct kref *kref)
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
253 complete(&tpg_np->tpg_np_comp);
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261 up(&tpg->np_login_sem);
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
267 iscsit_put_tiqn_for_login(tiqn);
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
275 int network_transport)
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->sin6_port);
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
312 * Called with mutex np_lock held
314 static struct iscsi_np *iscsit_get_np(
315 struct sockaddr_storage *sockaddr,
316 int network_transport)
321 list_for_each_entry(np, &g_np_list, np_list) {
322 spin_lock_bh(&np->np_thread_lock);
323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324 spin_unlock_bh(&np->np_thread_lock);
328 match = iscsit_check_np_match(sockaddr, np, network_transport);
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
336 spin_unlock_bh(&np->np_thread_lock);
339 spin_unlock_bh(&np->np_thread_lock);
345 struct iscsi_np *iscsit_add_np(
346 struct sockaddr_storage *sockaddr,
347 int network_transport)
352 mutex_lock(&np_lock);
355 * Locate the existing struct iscsi_np if already active..
357 np = iscsit_get_np(sockaddr, network_transport);
359 mutex_unlock(&np_lock);
363 np = kzalloc(sizeof(*np), GFP_KERNEL);
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
378 mutex_unlock(&np_lock);
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
387 mutex_unlock(&np_lock);
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
409 int iscsit_reset_np_thread(
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421 atomic_inc(&np->np_reset_count);
424 spin_unlock_bh(&np->np_thread_lock);
425 send_sig(SIGINT, np->np_thread, 1);
426 wait_for_completion(&np->np_restart_comp);
427 spin_lock_bh(&np->np_thread_lock);
429 spin_unlock_bh(&np->np_thread_lock);
431 if (tpg_np && shutdown) {
432 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
434 wait_for_completion(&tpg_np->tpg_np_comp);
440 static void iscsit_free_np(struct iscsi_np *np)
443 sock_release(np->np_socket);
446 int iscsit_del_np(struct iscsi_np *np)
448 spin_lock_bh(&np->np_thread_lock);
450 if (np->np_exports) {
452 spin_unlock_bh(&np->np_thread_lock);
455 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
456 spin_unlock_bh(&np->np_thread_lock);
460 * We need to send the signal to wakeup Linux/Net
461 * which may be sleeping in sock_accept()..
463 send_sig(SIGINT, np->np_thread, 1);
464 kthread_stop(np->np_thread);
465 np->np_thread = NULL;
468 np->np_transport->iscsit_free_np(np);
470 mutex_lock(&np_lock);
471 list_del(&np->np_list);
472 mutex_unlock(&np_lock);
474 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
475 &np->np_sockaddr, np->np_transport->name);
477 iscsit_put_transport(np->np_transport);
482 static void iscsit_get_rx_pdu(struct iscsi_conn *);
484 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
486 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
488 EXPORT_SYMBOL(iscsit_queue_rsp);
490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
492 spin_lock_bh(&conn->cmd_lock);
493 if (!list_empty(&cmd->i_conn_node))
494 list_del_init(&cmd->i_conn_node);
495 spin_unlock_bh(&conn->cmd_lock);
497 __iscsit_free_cmd(cmd, true);
499 EXPORT_SYMBOL(iscsit_aborted_task);
501 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
502 u32, u32, u8 *, u8 *);
503 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
506 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
507 const void *data_buf, u32 data_buf_len)
509 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
511 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
514 iov = &cmd->iov_misc[0];
515 iov[niov].iov_base = cmd->pdu;
516 iov[niov++].iov_len = ISCSI_HDR_LEN;
518 if (conn->conn_ops->HeaderDigest) {
519 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
521 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
522 ISCSI_HDR_LEN, 0, NULL,
523 (u8 *)header_digest);
525 iov[0].iov_len += ISCSI_CRC_LEN;
526 tx_size += ISCSI_CRC_LEN;
527 pr_debug("Attaching CRC32C HeaderDigest"
528 " to opcode 0x%x 0x%08x\n",
529 hdr->opcode, *header_digest);
533 u32 padding = ((-data_buf_len) & 3);
535 iov[niov].iov_base = (void *)data_buf;
536 iov[niov++].iov_len = data_buf_len;
537 tx_size += data_buf_len;
540 iov[niov].iov_base = &cmd->pad_bytes;
541 iov[niov++].iov_len = padding;
543 pr_debug("Attaching %u additional"
544 " padding bytes.\n", padding);
547 if (conn->conn_ops->DataDigest) {
548 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
549 data_buf, data_buf_len,
551 (u8 *)&cmd->pad_bytes,
552 (u8 *)&cmd->data_crc);
554 iov[niov].iov_base = &cmd->data_crc;
555 iov[niov++].iov_len = ISCSI_CRC_LEN;
556 tx_size += ISCSI_CRC_LEN;
557 pr_debug("Attached DataDigest for %u"
558 " bytes opcode 0x%x, CRC 0x%08x\n",
559 data_buf_len, hdr->opcode, cmd->data_crc);
563 cmd->iov_misc_count = niov;
564 cmd->tx_size = tx_size;
566 ret = iscsit_send_tx_data(cmd, conn, 1);
568 iscsit_tx_thread_wait_for_tcp(conn);
575 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
576 static void iscsit_unmap_iovec(struct iscsi_cmd *);
577 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
578 u32, u32, u32, u8 *);
580 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
581 const struct iscsi_datain *datain)
584 u32 iov_count = 0, tx_size = 0;
587 iov = &cmd->iov_data[0];
588 iov[iov_count].iov_base = cmd->pdu;
589 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
590 tx_size += ISCSI_HDR_LEN;
592 if (conn->conn_ops->HeaderDigest) {
593 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
595 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
596 ISCSI_HDR_LEN, 0, NULL,
597 (u8 *)header_digest);
599 iov[0].iov_len += ISCSI_CRC_LEN;
600 tx_size += ISCSI_CRC_LEN;
602 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
606 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
607 datain->offset, datain->length);
611 iov_count += iov_ret;
612 tx_size += datain->length;
614 cmd->padding = ((-datain->length) & 3);
616 iov[iov_count].iov_base = cmd->pad_bytes;
617 iov[iov_count++].iov_len = cmd->padding;
618 tx_size += cmd->padding;
620 pr_debug("Attaching %u padding bytes\n", cmd->padding);
623 if (conn->conn_ops->DataDigest) {
624 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
630 iov[iov_count].iov_base = &cmd->data_crc;
631 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
632 tx_size += ISCSI_CRC_LEN;
634 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
635 datain->length + cmd->padding, cmd->data_crc);
638 cmd->iov_data_count = iov_count;
639 cmd->tx_size = tx_size;
641 ret = iscsit_fe_sendpage_sg(cmd, conn);
643 iscsit_unmap_iovec(cmd);
646 iscsit_tx_thread_wait_for_tcp(conn);
653 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
654 struct iscsi_datain_req *dr, const void *buf,
658 return iscsit_xmit_datain_pdu(conn, cmd, buf);
660 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
663 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
665 return TARGET_PROT_NORMAL;
668 static struct iscsit_transport iscsi_target_transport = {
670 .transport_type = ISCSI_TCP,
671 .rdma_shutdown = false,
673 .iscsit_setup_np = iscsit_setup_np,
674 .iscsit_accept_np = iscsit_accept_np,
675 .iscsit_free_np = iscsit_free_np,
676 .iscsit_get_login_rx = iscsit_get_login_rx,
677 .iscsit_put_login_tx = iscsit_put_login_tx,
678 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
679 .iscsit_immediate_queue = iscsit_immediate_queue,
680 .iscsit_response_queue = iscsit_response_queue,
681 .iscsit_queue_data_in = iscsit_queue_rsp,
682 .iscsit_queue_status = iscsit_queue_rsp,
683 .iscsit_aborted_task = iscsit_aborted_task,
684 .iscsit_xmit_pdu = iscsit_xmit_pdu,
685 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
686 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
689 static int __init iscsi_target_init_module(void)
693 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
694 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
698 spin_lock_init(&iscsit_global->ts_bitmap_lock);
699 mutex_init(&auth_id_lock);
700 spin_lock_init(&sess_idr_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("nable 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 if (data_length && page_off) {
1385 struct scatterlist first_sg;
1386 u32 len = min_t(u32, data_length, sg->length - page_off);
1388 sg_init_table(&first_sg, 1);
1389 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1391 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1392 crypto_ahash_update(hash);
1398 while (data_length) {
1399 u32 cur_len = min_t(u32, data_length, sg->length);
1401 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1402 crypto_ahash_update(hash);
1404 data_length -= cur_len;
1405 /* iscsit_map_iovec has already checked for invalid sg pointers */
1410 struct scatterlist pad_sg;
1412 sg_init_one(&pad_sg, pad_bytes, padding);
1413 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1415 crypto_ahash_finup(hash);
1417 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1418 crypto_ahash_final(hash);
1424 static void iscsit_do_crypto_hash_buf(
1425 struct ahash_request *hash,
1432 struct scatterlist sg[2];
1434 sg_init_table(sg, ARRAY_SIZE(sg));
1435 sg_set_buf(sg, buf, payload_length);
1437 sg_set_buf(sg + 1, pad_bytes, padding);
1439 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1441 crypto_ahash_digest(hash);
1445 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1446 struct iscsi_cmd *cmd, u32 payload_length,
1449 struct iscsi_data *hdr = buf;
1450 struct se_cmd *se_cmd;
1454 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1456 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1457 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1458 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1459 payload_length, conn->cid);
1461 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1462 pr_err("Command ITT: 0x%08x received DataOUT after"
1463 " last DataOUT received, dumping payload\n",
1464 cmd->init_task_tag);
1465 return iscsit_dump_data_payload(conn, payload_length, 1);
1468 if (cmd->data_direction != DMA_TO_DEVICE) {
1469 pr_err("Command ITT: 0x%08x received DataOUT for a"
1470 " NON-WRITE command.\n", cmd->init_task_tag);
1471 return iscsit_dump_data_payload(conn, payload_length, 1);
1473 se_cmd = &cmd->se_cmd;
1474 iscsit_mod_dataout_timer(cmd);
1476 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1477 pr_err("DataOut Offset: %u, Length %u greater than"
1478 " iSCSI Command EDTL %u, protocol error.\n",
1479 hdr->offset, payload_length, cmd->se_cmd.data_length);
1480 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1483 if (cmd->unsolicited_data) {
1484 int dump_unsolicited_data = 0;
1486 if (conn->sess->sess_ops->InitialR2T) {
1487 pr_err("Received unexpected unsolicited data"
1488 " while InitialR2T=Yes, protocol error.\n");
1489 transport_send_check_condition_and_sense(&cmd->se_cmd,
1490 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1494 * Special case for dealing with Unsolicited DataOUT
1495 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1499 /* Something's amiss if we're not in WRITE_PENDING state... */
1500 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1501 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1502 dump_unsolicited_data = 1;
1504 if (dump_unsolicited_data) {
1506 * Check if a delayed TASK_ABORTED status needs to
1507 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1508 * received with the unsolicited data out.
1510 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1511 iscsit_stop_dataout_timer(cmd);
1513 transport_check_aborted_status(se_cmd,
1514 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1515 return iscsit_dump_data_payload(conn, payload_length, 1);
1519 * For the normal solicited data path:
1521 * Check for a delayed TASK_ABORTED status and dump any
1522 * incoming data out payload if one exists. Also, when the
1523 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1524 * data out sequence, we decrement outstanding_r2ts. Once
1525 * outstanding_r2ts reaches zero, go ahead and send the delayed
1526 * TASK_ABORTED status.
1528 if (se_cmd->transport_state & CMD_T_ABORTED) {
1529 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1530 if (--cmd->outstanding_r2ts < 1) {
1531 iscsit_stop_dataout_timer(cmd);
1532 transport_check_aborted_status(
1536 return iscsit_dump_data_payload(conn, payload_length, 1);
1540 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1541 * within-command recovery checks before receiving the payload.
1543 rc = iscsit_check_pre_dataout(cmd, buf);
1544 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1546 else if (rc == DATAOUT_CANNOT_RECOVER)
1551 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1554 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1555 struct iscsi_cmd **out_cmd)
1557 struct iscsi_data *hdr = buf;
1558 struct iscsi_cmd *cmd;
1559 u32 payload_length = ntoh24(hdr->dlength);
1561 bool success = false;
1563 if (!payload_length) {
1564 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1568 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1569 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1570 " MaxXmitDataSegmentLength: %u\n", payload_length,
1571 conn->conn_ops->MaxXmitDataSegmentLength);
1572 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1575 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1579 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1586 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1589 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1590 struct iscsi_data *hdr)
1593 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1594 u32 payload_length = ntoh24(hdr->dlength);
1595 int iov_ret, data_crc_failed = 0;
1597 rx_size += payload_length;
1598 iov = &cmd->iov_data[0];
1600 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1605 iov_count += iov_ret;
1607 padding = ((-payload_length) & 3);
1609 iov[iov_count].iov_base = cmd->pad_bytes;
1610 iov[iov_count++].iov_len = padding;
1612 pr_debug("Receiving %u padding bytes.\n", padding);
1615 if (conn->conn_ops->DataDigest) {
1616 iov[iov_count].iov_base = &checksum;
1617 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1618 rx_size += ISCSI_CRC_LEN;
1621 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1623 iscsit_unmap_iovec(cmd);
1625 if (rx_got != rx_size)
1628 if (conn->conn_ops->DataDigest) {
1631 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1632 be32_to_cpu(hdr->offset),
1633 payload_length, padding,
1636 if (checksum != data_crc) {
1637 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1638 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1639 " does not match computed 0x%08x\n",
1640 hdr->itt, hdr->offset, payload_length,
1641 hdr->datasn, checksum, data_crc);
1642 data_crc_failed = 1;
1644 pr_debug("Got CRC32C DataDigest 0x%08x for"
1645 " %u bytes of Data Out\n", checksum,
1650 return data_crc_failed;
1654 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1655 bool data_crc_failed)
1657 struct iscsi_conn *conn = cmd->conn;
1660 * Increment post receive data and CRC values or perform
1661 * within-command recovery.
1663 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1664 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1666 else if (rc == DATAOUT_SEND_R2T) {
1667 iscsit_set_dataout_sequence_values(cmd);
1668 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1669 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1671 * Handle extra special case for out of order
1672 * Unsolicited Data Out.
1674 spin_lock_bh(&cmd->istate_lock);
1675 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1676 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1677 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1678 spin_unlock_bh(&cmd->istate_lock);
1680 iscsit_stop_dataout_timer(cmd);
1683 target_execute_cmd(&cmd->se_cmd);
1685 } else /* DATAOUT_CANNOT_RECOVER */
1690 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1692 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1694 struct iscsi_cmd *cmd = NULL;
1695 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1697 bool data_crc_failed = false;
1699 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1705 rc = iscsit_get_dataout(conn, cmd, hdr);
1709 data_crc_failed = true;
1711 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1714 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1715 struct iscsi_nopout *hdr)
1717 u32 payload_length = ntoh24(hdr->dlength);
1719 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1720 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1722 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1723 (unsigned char *)hdr);
1725 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1726 (unsigned char *)hdr);
1729 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1730 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1731 " not set, protocol error.\n");
1733 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1734 (unsigned char *)hdr);
1736 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1737 (unsigned char *)hdr);
1740 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1741 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1742 " greater than MaxXmitDataSegmentLength: %u, protocol"
1743 " error.\n", payload_length,
1744 conn->conn_ops->MaxXmitDataSegmentLength);
1746 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1747 (unsigned char *)hdr);
1749 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1750 (unsigned char *)hdr);
1753 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1754 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1755 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1756 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1759 * This is not a response to a Unsolicited NopIN, which means
1760 * it can either be a NOPOUT ping request (with a valid ITT),
1761 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1762 * Either way, make sure we allocate an struct iscsi_cmd, as both
1763 * can contain ping data.
1765 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1766 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1767 cmd->i_state = ISTATE_SEND_NOPIN;
1768 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1770 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1771 cmd->targ_xfer_tag = 0xFFFFFFFF;
1772 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1773 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1774 cmd->data_direction = DMA_NONE;
1779 EXPORT_SYMBOL(iscsit_setup_nop_out);
1781 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1782 struct iscsi_nopout *hdr)
1784 struct iscsi_cmd *cmd_p = NULL;
1787 * Initiator is expecting a NopIN ping reply..
1789 if (hdr->itt != RESERVED_ITT) {
1791 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1792 (unsigned char *)hdr);
1794 spin_lock_bh(&conn->cmd_lock);
1795 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1796 spin_unlock_bh(&conn->cmd_lock);
1798 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1800 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1801 iscsit_add_cmd_to_response_queue(cmd, conn,
1806 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1807 (unsigned char *)hdr, hdr->cmdsn);
1808 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1810 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1816 * This was a response to a unsolicited NOPIN ping.
1818 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1819 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1823 iscsit_stop_nopin_response_timer(conn);
1825 cmd_p->i_state = ISTATE_REMOVE;
1826 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1828 iscsit_start_nopin_timer(conn);
1832 * Otherwise, initiator is not expecting a NOPIN is response.
1833 * Just ignore for now.
1837 iscsit_free_cmd(cmd, false);
1841 EXPORT_SYMBOL(iscsit_process_nop_out);
1843 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1846 unsigned char *ping_data = NULL;
1847 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1848 struct kvec *iov = NULL;
1849 u32 payload_length = ntoh24(hdr->dlength);
1852 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1856 * Handle NOP-OUT payload for traditional iSCSI sockets
1858 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1859 u32 checksum, data_crc, padding = 0;
1860 int niov = 0, rx_got, rx_size = payload_length;
1862 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1868 iov = &cmd->iov_misc[0];
1869 iov[niov].iov_base = ping_data;
1870 iov[niov++].iov_len = payload_length;
1872 padding = ((-payload_length) & 3);
1874 pr_debug("Receiving %u additional bytes"
1875 " for padding.\n", padding);
1876 iov[niov].iov_base = &cmd->pad_bytes;
1877 iov[niov++].iov_len = padding;
1880 if (conn->conn_ops->DataDigest) {
1881 iov[niov].iov_base = &checksum;
1882 iov[niov++].iov_len = ISCSI_CRC_LEN;
1883 rx_size += ISCSI_CRC_LEN;
1886 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1887 if (rx_got != rx_size) {
1892 if (conn->conn_ops->DataDigest) {
1893 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1894 ping_data, payload_length,
1895 padding, cmd->pad_bytes,
1898 if (checksum != data_crc) {
1899 pr_err("Ping data CRC32C DataDigest"
1900 " 0x%08x does not match computed 0x%08x\n",
1901 checksum, data_crc);
1902 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1903 pr_err("Unable to recover from"
1904 " NOPOUT Ping DataCRC failure while in"
1910 * Silently drop this PDU and let the
1911 * initiator plug the CmdSN gap.
1913 pr_debug("Dropping NOPOUT"
1914 " Command CmdSN: 0x%08x due to"
1915 " DataCRC error.\n", hdr->cmdsn);
1920 pr_debug("Got CRC32C DataDigest"
1921 " 0x%08x for %u bytes of ping data.\n",
1922 checksum, payload_length);
1926 ping_data[payload_length] = '\0';
1928 * Attach ping data to struct iscsi_cmd->buf_ptr.
1930 cmd->buf_ptr = ping_data;
1931 cmd->buf_ptr_size = payload_length;
1933 pr_debug("Got %u bytes of NOPOUT ping"
1934 " data.\n", payload_length);
1935 pr_debug("Ping Data: \"%s\"\n", ping_data);
1938 return iscsit_process_nop_out(conn, cmd, hdr);
1941 iscsit_free_cmd(cmd, false);
1947 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1949 switch (iscsi_tmf) {
1950 case ISCSI_TM_FUNC_ABORT_TASK:
1951 return TMR_ABORT_TASK;
1952 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1953 return TMR_ABORT_TASK_SET;
1954 case ISCSI_TM_FUNC_CLEAR_ACA:
1955 return TMR_CLEAR_ACA;
1956 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1957 return TMR_CLEAR_TASK_SET;
1958 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1959 return TMR_LUN_RESET;
1960 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1961 return TMR_TARGET_WARM_RESET;
1962 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1963 return TMR_TARGET_COLD_RESET;
1970 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1973 struct se_tmr_req *se_tmr;
1974 struct iscsi_tmr_req *tmr_req;
1975 struct iscsi_tm *hdr;
1976 int out_of_order_cmdsn = 0, ret;
1977 u8 function, tcm_function = TMR_UNKNOWN;
1979 hdr = (struct iscsi_tm *) buf;
1980 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1981 function = hdr->flags;
1983 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1984 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1985 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1986 hdr->rtt, hdr->refcmdsn, conn->cid);
1988 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1989 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1990 hdr->rtt != RESERVED_ITT)) {
1991 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1992 hdr->rtt = RESERVED_ITT;
1995 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1996 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1997 pr_err("Task Management Request TASK_REASSIGN not"
1998 " issued as immediate command, bad iSCSI Initiator"
1999 "implementation\n");
2000 return iscsit_add_reject_cmd(cmd,
2001 ISCSI_REASON_PROTOCOL_ERROR, buf);
2003 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2004 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2005 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2007 cmd->data_direction = DMA_NONE;
2008 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2009 if (!cmd->tmr_req) {
2010 return iscsit_add_reject_cmd(cmd,
2011 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2015 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2016 conn->sess->se_sess, 0, DMA_NONE,
2017 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2019 target_get_sess_cmd(&cmd->se_cmd, true);
2022 * TASK_REASSIGN for ERL=2 / connection stays inside of
2023 * LIO-Target $FABRIC_MOD
2025 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2026 tcm_function = iscsit_convert_tmf(function);
2027 if (tcm_function == TMR_UNKNOWN) {
2028 pr_err("Unknown iSCSI TMR Function:"
2029 " 0x%02x\n", function);
2030 return iscsit_add_reject_cmd(cmd,
2031 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2034 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2037 return iscsit_add_reject_cmd(cmd,
2038 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2040 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2042 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2043 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2044 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2045 cmd->init_task_tag = hdr->itt;
2046 cmd->targ_xfer_tag = 0xFFFFFFFF;
2047 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2048 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2049 se_tmr = cmd->se_cmd.se_tmr_req;
2050 tmr_req = cmd->tmr_req;
2052 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2054 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2055 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2056 scsilun_to_int(&hdr->lun));
2058 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2064 case ISCSI_TM_FUNC_ABORT_TASK:
2065 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2066 if (se_tmr->response)
2069 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2070 case ISCSI_TM_FUNC_CLEAR_ACA:
2071 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2072 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2074 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2075 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2076 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2080 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2081 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2082 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2086 case ISCSI_TM_FUNC_TASK_REASSIGN:
2087 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2089 * Perform sanity checks on the ExpDataSN only if the
2090 * TASK_REASSIGN was successful.
2092 if (se_tmr->response)
2095 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2096 return iscsit_add_reject_cmd(cmd,
2097 ISCSI_REASON_BOOKMARK_INVALID, buf);
2100 pr_err("Unknown TMR function: 0x%02x, protocol"
2101 " error.\n", function);
2102 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2106 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2107 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2108 se_tmr->call_transport = 1;
2110 spin_lock_bh(&conn->cmd_lock);
2111 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2112 spin_unlock_bh(&conn->cmd_lock);
2114 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2115 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2116 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2117 out_of_order_cmdsn = 1;
2118 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2119 target_put_sess_cmd(&cmd->se_cmd);
2121 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2125 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2127 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2130 * Found the referenced task, send to transport for processing.
2132 if (se_tmr->call_transport)
2133 return transport_generic_handle_tmr(&cmd->se_cmd);
2136 * Could not find the referenced LUN, task, or Task Management
2137 * command not authorized or supported. Change state and
2138 * let the tx_thread send the response.
2140 * For connection recovery, this is also the default action for
2141 * TMR TASK_REASSIGN.
2143 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2144 target_put_sess_cmd(&cmd->se_cmd);
2147 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2149 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2151 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2152 struct iscsi_text *hdr)
2154 u32 payload_length = ntoh24(hdr->dlength);
2156 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2157 pr_err("Unable to accept text parameter length: %u"
2158 "greater than MaxXmitDataSegmentLength %u.\n",
2159 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2160 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2161 (unsigned char *)hdr);
2164 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2165 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2166 pr_err("Multi sequence text commands currently not supported\n");
2167 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2168 (unsigned char *)hdr);
2171 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2172 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2173 hdr->exp_statsn, payload_length);
2175 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2176 cmd->i_state = ISTATE_SEND_TEXTRSP;
2177 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2178 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2179 cmd->targ_xfer_tag = 0xFFFFFFFF;
2180 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2181 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2182 cmd->data_direction = DMA_NONE;
2183 kfree(cmd->text_in_ptr);
2184 cmd->text_in_ptr = NULL;
2188 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2191 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2192 struct iscsi_text *hdr)
2194 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2198 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2199 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2200 pr_err("Unable to locate text_in buffer for sendtargets"
2204 goto empty_sendtargets;
2206 if (strncmp("SendTargets", text_in, 11) != 0) {
2207 pr_err("Received Text Data that is not"
2208 " SendTargets, cannot continue.\n");
2211 text_ptr = strchr(text_in, '=');
2213 pr_err("No \"=\" separator found in Text Data,"
2214 " cannot continue.\n");
2217 if (!strncmp("=All", text_ptr, 4)) {
2218 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2219 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2220 !strncmp("=eui.", text_ptr, 5)) {
2221 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2223 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2227 spin_lock_bh(&conn->cmd_lock);
2228 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2229 spin_unlock_bh(&conn->cmd_lock);
2232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2234 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2235 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2236 (unsigned char *)hdr, hdr->cmdsn);
2237 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2243 return iscsit_execute_cmd(cmd, 0);
2246 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2247 (unsigned char *)hdr);
2249 EXPORT_SYMBOL(iscsit_process_text_cmd);
2252 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2255 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2256 char *text_in = NULL;
2257 u32 payload_length = ntoh24(hdr->dlength);
2260 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2264 rx_size = payload_length;
2265 if (payload_length) {
2266 u32 checksum = 0, data_crc = 0;
2267 u32 padding = 0, pad_bytes = 0;
2268 int niov = 0, rx_got;
2271 text_in = kzalloc(payload_length, GFP_KERNEL);
2275 cmd->text_in_ptr = text_in;
2277 memset(iov, 0, 3 * sizeof(struct kvec));
2278 iov[niov].iov_base = text_in;
2279 iov[niov++].iov_len = payload_length;
2281 padding = ((-payload_length) & 3);
2283 iov[niov].iov_base = &pad_bytes;
2284 iov[niov++].iov_len = padding;
2286 pr_debug("Receiving %u additional bytes"
2287 " for padding.\n", padding);
2289 if (conn->conn_ops->DataDigest) {
2290 iov[niov].iov_base = &checksum;
2291 iov[niov++].iov_len = ISCSI_CRC_LEN;
2292 rx_size += ISCSI_CRC_LEN;
2295 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2296 if (rx_got != rx_size)
2299 if (conn->conn_ops->DataDigest) {
2300 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2301 text_in, payload_length,
2302 padding, (u8 *)&pad_bytes,
2305 if (checksum != data_crc) {
2306 pr_err("Text data CRC32C DataDigest"
2307 " 0x%08x does not match computed"
2308 " 0x%08x\n", checksum, data_crc);
2309 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2310 pr_err("Unable to recover from"
2311 " Text Data digest failure while in"
2316 * Silently drop this PDU and let the
2317 * initiator plug the CmdSN gap.
2319 pr_debug("Dropping Text"
2320 " Command CmdSN: 0x%08x due to"
2321 " DataCRC error.\n", hdr->cmdsn);
2326 pr_debug("Got CRC32C DataDigest"
2327 " 0x%08x for %u bytes of text data.\n",
2328 checksum, payload_length);
2331 text_in[payload_length - 1] = '\0';
2332 pr_debug("Successfully read %d bytes of text"
2333 " data.\n", payload_length);
2336 return iscsit_process_text_cmd(conn, cmd, hdr);
2339 kfree(cmd->text_in_ptr);
2340 cmd->text_in_ptr = NULL;
2341 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2344 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2346 struct iscsi_conn *conn_p;
2347 struct iscsi_session *sess = conn->sess;
2349 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2350 " for SID: %u.\n", conn->cid, conn->sess->sid);
2352 atomic_set(&sess->session_logout, 1);
2353 atomic_set(&conn->conn_logout_remove, 1);
2354 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2356 iscsit_inc_conn_usage_count(conn);
2357 iscsit_inc_session_usage_count(sess);
2359 spin_lock_bh(&sess->conn_lock);
2360 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2361 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2364 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2365 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2367 spin_unlock_bh(&sess->conn_lock);
2369 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2374 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2376 struct iscsi_conn *l_conn;
2377 struct iscsi_session *sess = conn->sess;
2379 pr_debug("Received logout request CLOSECONNECTION for CID:"
2380 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2383 * A Logout Request with a CLOSECONNECTION reason code for a CID
2384 * can arrive on a connection with a differing CID.
2386 if (conn->cid == cmd->logout_cid) {
2387 spin_lock_bh(&conn->state_lock);
2388 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2389 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2391 atomic_set(&conn->conn_logout_remove, 1);
2392 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2393 iscsit_inc_conn_usage_count(conn);
2395 spin_unlock_bh(&conn->state_lock);
2398 * Handle all different cid CLOSECONNECTION requests in
2399 * iscsit_logout_post_handler_diffcid() as to give enough
2400 * time for any non immediate command's CmdSN to be
2401 * acknowledged on the connection in question.
2403 * Here we simply make sure the CID is still around.
2405 l_conn = iscsit_get_conn_from_cid(sess,
2408 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2409 iscsit_add_cmd_to_response_queue(cmd, conn,
2414 iscsit_dec_conn_usage_count(l_conn);
2417 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2422 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2424 struct iscsi_session *sess = conn->sess;
2426 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2427 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2429 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2430 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2431 " while ERL!=2.\n");
2432 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2433 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2437 if (conn->cid == cmd->logout_cid) {
2438 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2439 " with CID: %hu on CID: %hu, implementation error.\n",
2440 cmd->logout_cid, conn->cid);
2441 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2442 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2446 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2452 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2455 int cmdsn_ret, logout_remove = 0;
2457 struct iscsi_logout *hdr;
2458 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2460 hdr = (struct iscsi_logout *) buf;
2461 reason_code = (hdr->flags & 0x7f);
2464 spin_lock(&tiqn->logout_stats.lock);
2465 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2466 tiqn->logout_stats.normal_logouts++;
2468 tiqn->logout_stats.abnormal_logouts++;
2469 spin_unlock(&tiqn->logout_stats.lock);
2472 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2473 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2474 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2475 hdr->cid, conn->cid);
2477 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2478 pr_err("Received logout request on connection that"
2479 " is not in logged in state, ignoring request.\n");
2480 iscsit_free_cmd(cmd, false);
2484 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2485 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2486 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2487 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2488 cmd->targ_xfer_tag = 0xFFFFFFFF;
2489 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2490 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2491 cmd->logout_cid = be16_to_cpu(hdr->cid);
2492 cmd->logout_reason = reason_code;
2493 cmd->data_direction = DMA_NONE;
2496 * We need to sleep in these cases (by returning 1) until the Logout
2497 * Response gets sent in the tx thread.
2499 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2500 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2501 be16_to_cpu(hdr->cid) == conn->cid))
2504 spin_lock_bh(&conn->cmd_lock);
2505 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2506 spin_unlock_bh(&conn->cmd_lock);
2508 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2509 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2512 * Immediate commands are executed, well, immediately.
2513 * Non-Immediate Logout Commands are executed in CmdSN order.
2515 if (cmd->immediate_cmd) {
2516 int ret = iscsit_execute_cmd(cmd, 0);
2521 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2522 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2524 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2528 return logout_remove;
2530 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2532 int iscsit_handle_snack(
2533 struct iscsi_conn *conn,
2536 struct iscsi_snack *hdr;
2538 hdr = (struct iscsi_snack *) buf;
2539 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2541 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2542 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2543 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2544 hdr->begrun, hdr->runlength, conn->cid);
2546 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2547 pr_err("Initiator sent SNACK request while in"
2548 " ErrorRecoveryLevel=0.\n");
2549 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2553 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2554 * call from inside iscsi_send_recovery_datain_or_r2t().
2556 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2558 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2560 be32_to_cpu(hdr->ttt),
2561 be32_to_cpu(hdr->begrun),
2562 be32_to_cpu(hdr->runlength));
2563 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2564 return iscsit_handle_status_snack(conn, hdr->itt,
2565 be32_to_cpu(hdr->ttt),
2566 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2567 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2568 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2569 be32_to_cpu(hdr->begrun),
2570 be32_to_cpu(hdr->runlength));
2571 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2572 /* FIXME: Support R-Data SNACK */
2573 pr_err("R-Data SNACK Not Supported.\n");
2574 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2577 pr_err("Unknown SNACK type 0x%02x, protocol"
2578 " error.\n", hdr->flags & 0x0f);
2579 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2585 EXPORT_SYMBOL(iscsit_handle_snack);
2587 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2589 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2590 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2591 wait_for_completion_interruptible_timeout(
2592 &conn->rx_half_close_comp,
2593 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2597 static int iscsit_handle_immediate_data(
2598 struct iscsi_cmd *cmd,
2599 struct iscsi_scsi_req *hdr,
2602 int iov_ret, rx_got = 0, rx_size = 0;
2603 u32 checksum, iov_count = 0, padding = 0;
2604 struct iscsi_conn *conn = cmd->conn;
2607 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2609 return IMMEDIATE_DATA_CANNOT_RECOVER;
2612 iov_count = iov_ret;
2613 iov = &cmd->iov_data[0];
2615 padding = ((-length) & 3);
2617 iov[iov_count].iov_base = cmd->pad_bytes;
2618 iov[iov_count++].iov_len = padding;
2622 if (conn->conn_ops->DataDigest) {
2623 iov[iov_count].iov_base = &checksum;
2624 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2625 rx_size += ISCSI_CRC_LEN;
2628 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2630 iscsit_unmap_iovec(cmd);
2632 if (rx_got != rx_size) {
2633 iscsit_rx_thread_wait_for_tcp(conn);
2634 return IMMEDIATE_DATA_CANNOT_RECOVER;
2637 if (conn->conn_ops->DataDigest) {
2640 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2641 cmd->write_data_done, length, padding,
2644 if (checksum != data_crc) {
2645 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2646 " does not match computed 0x%08x\n", checksum,
2649 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2650 pr_err("Unable to recover from"
2651 " Immediate Data digest failure while"
2653 iscsit_reject_cmd(cmd,
2654 ISCSI_REASON_DATA_DIGEST_ERROR,
2655 (unsigned char *)hdr);
2656 return IMMEDIATE_DATA_CANNOT_RECOVER;
2658 iscsit_reject_cmd(cmd,
2659 ISCSI_REASON_DATA_DIGEST_ERROR,
2660 (unsigned char *)hdr);
2661 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2664 pr_debug("Got CRC32C DataDigest 0x%08x for"
2665 " %u bytes of Immediate Data\n", checksum,
2670 cmd->write_data_done += length;
2672 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2673 spin_lock_bh(&cmd->istate_lock);
2674 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2675 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2676 spin_unlock_bh(&cmd->istate_lock);
2679 return IMMEDIATE_DATA_NORMAL_OPERATION;
2683 * Called with sess->conn_lock held.
2685 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2686 with active network interface */
2687 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2689 struct iscsi_cmd *cmd;
2690 struct iscsi_conn *conn_p;
2694 * Only send a Asynchronous Message on connections whos network
2695 * interface is still functional.
2697 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2698 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2699 iscsit_inc_conn_usage_count(conn_p);
2708 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2710 iscsit_dec_conn_usage_count(conn_p);
2714 cmd->logout_cid = conn->cid;
2715 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2716 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2718 spin_lock_bh(&conn_p->cmd_lock);
2719 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2720 spin_unlock_bh(&conn_p->cmd_lock);
2722 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2723 iscsit_dec_conn_usage_count(conn_p);
2726 static int iscsit_send_conn_drop_async_message(
2727 struct iscsi_cmd *cmd,
2728 struct iscsi_conn *conn)
2730 struct iscsi_async *hdr;
2732 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2734 hdr = (struct iscsi_async *) cmd->pdu;
2735 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2736 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2737 cmd->init_task_tag = RESERVED_ITT;
2738 cmd->targ_xfer_tag = 0xFFFFFFFF;
2739 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2740 cmd->stat_sn = conn->stat_sn++;
2741 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2742 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2743 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2744 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2745 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2746 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2747 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2749 pr_debug("Sending Connection Dropped Async Message StatSN:"
2750 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2751 cmd->logout_cid, conn->cid);
2753 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2756 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2758 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2759 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2760 wait_for_completion_interruptible_timeout(
2761 &conn->tx_half_close_comp,
2762 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2767 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2768 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2771 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2772 hdr->flags = datain->flags;
2773 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2774 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2775 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2776 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2777 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2778 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2779 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2782 hton24(hdr->dlength, datain->length);
2783 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2784 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2785 (struct scsi_lun *)&hdr->lun);
2787 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2789 hdr->itt = cmd->init_task_tag;
2791 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2792 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2794 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2796 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2798 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2800 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2801 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2802 hdr->datasn = cpu_to_be32(datain->data_sn);
2803 hdr->offset = cpu_to_be32(datain->offset);
2805 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2806 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2807 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2808 ntohl(hdr->offset), datain->length, conn->cid);
2810 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2812 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2814 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2815 struct iscsi_datain datain;
2816 struct iscsi_datain_req *dr;
2818 bool set_statsn = false;
2820 memset(&datain, 0, sizeof(struct iscsi_datain));
2821 dr = iscsit_get_datain_values(cmd, &datain);
2823 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2824 cmd->init_task_tag);
2828 * Be paranoid and double check the logic for now.
2830 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2831 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2832 " datain.length: %u exceeds cmd->data_length: %u\n",
2833 cmd->init_task_tag, datain.offset, datain.length,
2834 cmd->se_cmd.data_length);
2838 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2840 * Special case for successfully execution w/ both DATAIN
2843 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2844 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2845 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2847 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2848 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2849 iscsit_increment_maxcmdsn(cmd, conn->sess);
2850 cmd->stat_sn = conn->stat_sn++;
2852 } else if (dr->dr_complete ==
2853 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2857 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2859 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2863 if (dr->dr_complete) {
2864 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2866 iscsit_free_datain_req(cmd, dr);
2873 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2874 struct iscsi_logout_rsp *hdr)
2876 struct iscsi_conn *logout_conn = NULL;
2877 struct iscsi_conn_recovery *cr = NULL;
2878 struct iscsi_session *sess = conn->sess;
2880 * The actual shutting down of Sessions and/or Connections
2881 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2882 * is done in scsi_logout_post_handler().
2884 switch (cmd->logout_reason) {
2885 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2886 pr_debug("iSCSI session logout successful, setting"
2887 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2888 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2890 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2891 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2894 * For CLOSECONNECTION logout requests carrying
2895 * a matching logout CID -> local CID, the reference
2896 * for the local CID will have been incremented in
2897 * iscsi_logout_closeconnection().
2899 * For CLOSECONNECTION logout requests carrying
2900 * a different CID than the connection it arrived
2901 * on, the connection responding to cmd->logout_cid
2902 * is stopped in iscsit_logout_post_handler_diffcid().
2905 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2906 " successful.\n", cmd->logout_cid, conn->cid);
2907 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2909 case ISCSI_LOGOUT_REASON_RECOVERY:
2910 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2911 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2914 * If the connection is still active from our point of view
2915 * force connection recovery to occur.
2917 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2920 iscsit_connection_reinstatement_rcfr(logout_conn);
2921 iscsit_dec_conn_usage_count(logout_conn);
2924 cr = iscsit_get_inactive_connection_recovery_entry(
2925 conn->sess, cmd->logout_cid);
2927 pr_err("Unable to locate CID: %hu for"
2928 " REMOVECONNFORRECOVERY Logout Request.\n",
2930 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2934 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2936 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2937 " for recovery for CID: %hu on CID: %hu successful.\n",
2938 cmd->logout_cid, conn->cid);
2939 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2942 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2943 cmd->logout_reason);
2947 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2948 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2949 hdr->response = cmd->logout_response;
2950 hdr->itt = cmd->init_task_tag;
2951 cmd->stat_sn = conn->stat_sn++;
2952 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2954 iscsit_increment_maxcmdsn(cmd, conn->sess);
2955 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2956 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2958 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2959 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2960 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2961 cmd->logout_cid, conn->cid);
2965 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2968 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2972 rc = iscsit_build_logout_rsp(cmd, conn,
2973 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2977 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2981 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2982 struct iscsi_nopin *hdr, bool nopout_response)
2984 hdr->opcode = ISCSI_OP_NOOP_IN;
2985 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2986 hton24(hdr->dlength, cmd->buf_ptr_size);
2987 if (nopout_response)
2988 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2989 hdr->itt = cmd->init_task_tag;
2990 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2991 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2993 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2995 if (nopout_response)
2996 iscsit_increment_maxcmdsn(cmd, conn->sess);
2998 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2999 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3001 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3002 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3003 "Solicited" : "Unsolicited", cmd->init_task_tag,
3004 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3006 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3009 * Unsolicited NOPIN, either requesting a response or not.
3011 static int iscsit_send_unsolicited_nopin(
3012 struct iscsi_cmd *cmd,
3013 struct iscsi_conn *conn,
3016 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3019 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3021 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3022 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3024 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3028 spin_lock_bh(&cmd->istate_lock);
3029 cmd->i_state = want_response ?
3030 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3031 spin_unlock_bh(&cmd->istate_lock);
3037 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3039 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3041 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3044 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3045 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3047 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3049 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3054 static int iscsit_send_r2t(
3055 struct iscsi_cmd *cmd,
3056 struct iscsi_conn *conn)
3058 struct iscsi_r2t *r2t;
3059 struct iscsi_r2t_rsp *hdr;
3062 r2t = iscsit_get_r2t_from_list(cmd);
3066 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3067 memset(hdr, 0, ISCSI_HDR_LEN);
3068 hdr->opcode = ISCSI_OP_R2T;
3069 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3070 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3071 (struct scsi_lun *)&hdr->lun);
3072 hdr->itt = cmd->init_task_tag;
3073 if (conn->conn_transport->iscsit_get_r2t_ttt)
3074 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3076 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3077 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3078 hdr->statsn = cpu_to_be32(conn->stat_sn);
3079 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3080 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3081 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3082 hdr->data_offset = cpu_to_be32(r2t->offset);
3083 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3085 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3086 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3087 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3088 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3089 r2t->offset, r2t->xfer_len, conn->cid);
3091 spin_lock_bh(&cmd->r2t_lock);
3093 spin_unlock_bh(&cmd->r2t_lock);
3095 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3100 spin_lock_bh(&cmd->dataout_timeout_lock);
3101 iscsit_start_dataout_timer(cmd, conn);
3102 spin_unlock_bh(&cmd->dataout_timeout_lock);
3108 * @recovery: If called from iscsi_task_reassign_complete_write() for
3109 * connection recovery.
3111 int iscsit_build_r2ts_for_cmd(
3112 struct iscsi_conn *conn,
3113 struct iscsi_cmd *cmd,
3117 u32 offset = 0, xfer_len = 0;
3119 spin_lock_bh(&cmd->r2t_lock);
3120 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3121 spin_unlock_bh(&cmd->r2t_lock);
3125 if (conn->sess->sess_ops->DataSequenceInOrder &&
3127 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3129 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3130 if (conn->sess->sess_ops->DataSequenceInOrder) {
3131 offset = cmd->r2t_offset;
3133 if (first_r2t && recovery) {
3134 int new_data_end = offset +
3135 conn->sess->sess_ops->MaxBurstLength -
3136 cmd->next_burst_len;
3138 if (new_data_end > cmd->se_cmd.data_length)
3139 xfer_len = cmd->se_cmd.data_length - offset;
3142 conn->sess->sess_ops->MaxBurstLength -
3143 cmd->next_burst_len;
3145 int new_data_end = offset +
3146 conn->sess->sess_ops->MaxBurstLength;
3148 if (new_data_end > cmd->se_cmd.data_length)
3149 xfer_len = cmd->se_cmd.data_length - offset;
3151 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3153 cmd->r2t_offset += xfer_len;
3155 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3158 struct iscsi_seq *seq;
3160 seq = iscsit_get_seq_holder_for_r2t(cmd);
3162 spin_unlock_bh(&cmd->r2t_lock);
3166 offset = seq->offset;
3167 xfer_len = seq->xfer_len;
3169 if (cmd->seq_send_order == cmd->seq_count)
3170 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3172 cmd->outstanding_r2ts++;
3175 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3176 spin_unlock_bh(&cmd->r2t_lock);
3180 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3183 spin_unlock_bh(&cmd->r2t_lock);
3187 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3189 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3190 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3193 cmd->stat_sn = conn->stat_sn++;
3195 atomic_long_inc(&conn->sess->rsp_pdus);
3197 memset(hdr, 0, ISCSI_HDR_LEN);
3198 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3199 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3200 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3201 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3202 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3203 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3204 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3205 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3207 hdr->response = cmd->iscsi_response;
3208 hdr->cmd_status = cmd->se_cmd.scsi_status;
3209 hdr->itt = cmd->init_task_tag;
3210 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3212 iscsit_increment_maxcmdsn(cmd, conn->sess);
3213 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3214 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3216 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3217 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3218 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3219 cmd->se_cmd.scsi_status, conn->cid);
3221 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3223 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3225 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3226 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3227 void *data_buf = NULL;
3228 u32 padding = 0, data_buf_len = 0;
3230 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3233 * Attach SENSE DATA payload to iSCSI Response PDU
3235 if (cmd->se_cmd.sense_buffer &&
3236 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3237 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3238 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3239 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3241 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3242 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3243 data_buf = cmd->sense_buffer;
3244 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3247 memset(cmd->sense_buffer +
3248 cmd->se_cmd.scsi_sense_length, 0, padding);
3249 pr_debug("Adding %u bytes of padding to"
3250 " SENSE.\n", padding);
3253 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3255 cmd->se_cmd.scsi_sense_length);
3258 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3262 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3264 switch (se_tmr->response) {
3265 case TMR_FUNCTION_COMPLETE:
3266 return ISCSI_TMF_RSP_COMPLETE;
3267 case TMR_TASK_DOES_NOT_EXIST:
3268 return ISCSI_TMF_RSP_NO_TASK;
3269 case TMR_LUN_DOES_NOT_EXIST:
3270 return ISCSI_TMF_RSP_NO_LUN;
3271 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3272 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3273 case TMR_FUNCTION_REJECTED:
3275 return ISCSI_TMF_RSP_REJECTED;
3280 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3281 struct iscsi_tm_rsp *hdr)
3283 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3285 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3286 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3287 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3288 hdr->itt = cmd->init_task_tag;
3289 cmd->stat_sn = conn->stat_sn++;
3290 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3292 iscsit_increment_maxcmdsn(cmd, conn->sess);
3293 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3294 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3296 pr_debug("Built Task Management Response ITT: 0x%08x,"
3297 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3298 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3300 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3303 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3305 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3307 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3309 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3312 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3316 if (np->np_sockaddr.ss_family == AF_INET6) {
3317 const struct sockaddr_in6 sin6 = {
3318 .sin6_addr = IN6ADDR_ANY_INIT };
3319 struct sockaddr_in6 *sock_in6 =
3320 (struct sockaddr_in6 *)&np->np_sockaddr;
3322 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3323 sin6.sin6_addr.s6_addr, 16))
3326 struct sockaddr_in * sock_in =
3327 (struct sockaddr_in *)&np->np_sockaddr;
3329 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3336 #define SENDTARGETS_BUF_LIMIT 32768U
3339 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3340 enum iscsit_transport_type network_transport,
3341 int skip_bytes, bool *completed)
3343 char *payload = NULL;
3344 struct iscsi_conn *conn = cmd->conn;
3345 struct iscsi_portal_group *tpg;
3346 struct iscsi_tiqn *tiqn;
3347 struct iscsi_tpg_np *tpg_np;
3348 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3349 int target_name_printed;
3350 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3351 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3354 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3355 SENDTARGETS_BUF_LIMIT);
3357 payload = kzalloc(buffer_len, GFP_KERNEL);
3362 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3365 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3366 text_ptr = strchr(text_in, '=');
3368 pr_err("Unable to locate '=' string in text_in:"
3374 * Skip over '=' character..
3379 spin_lock(&tiqn_lock);
3380 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3381 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3382 strcmp(tiqn->tiqn, text_ptr)) {
3386 target_name_printed = 0;
3388 spin_lock(&tiqn->tiqn_tpg_lock);
3389 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3391 /* If demo_mode_discovery=0 and generate_node_acls=0
3392 * (demo mode dislabed) do not return
3393 * TargetName+TargetAddress unless a NodeACL exists.
3396 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3397 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3398 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3399 cmd->conn->sess->sess_ops->InitiatorName))) {
3403 spin_lock(&tpg->tpg_state_lock);
3404 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3405 spin_unlock(&tpg->tpg_state_lock);
3407 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3410 spin_lock(&tpg->tpg_np_lock);
3411 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3413 struct iscsi_np *np = tpg_np->tpg_np;
3414 bool inaddr_any = iscsit_check_inaddr_any(np);
3415 struct sockaddr_storage *sockaddr;
3417 if (np->np_network_transport != network_transport)
3420 if (!target_name_printed) {
3421 len = sprintf(buf, "TargetName=%s",
3425 if ((len + payload_len) > buffer_len) {
3426 spin_unlock(&tpg->tpg_np_lock);
3427 spin_unlock(&tiqn->tiqn_tpg_lock);
3432 if (skip_bytes && len <= skip_bytes) {
3435 memcpy(payload + payload_len, buf, len);
3437 target_name_printed = 1;
3438 if (len > skip_bytes)
3444 sockaddr = &conn->local_sockaddr;
3446 sockaddr = &np->np_sockaddr;
3448 len = sprintf(buf, "TargetAddress="
3454 if ((len + payload_len) > buffer_len) {
3455 spin_unlock(&tpg->tpg_np_lock);
3456 spin_unlock(&tiqn->tiqn_tpg_lock);
3461 if (skip_bytes && len <= skip_bytes) {
3464 memcpy(payload + payload_len, buf, len);
3466 if (len > skip_bytes)
3470 spin_unlock(&tpg->tpg_np_lock);
3472 spin_unlock(&tiqn->tiqn_tpg_lock);
3479 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3482 spin_unlock(&tiqn_lock);
3484 cmd->buf_ptr = payload;
3490 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3491 struct iscsi_text_rsp *hdr,
3492 enum iscsit_transport_type network_transport)
3494 int text_length, padding;
3495 bool completed = true;
3497 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3498 cmd->read_data_done,
3500 if (text_length < 0)
3504 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3506 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3507 cmd->read_data_done += text_length;
3508 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3509 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3511 hdr->opcode = ISCSI_OP_TEXT_RSP;
3512 padding = ((-text_length) & 3);
3513 hton24(hdr->dlength, text_length);
3514 hdr->itt = cmd->init_task_tag;
3515 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3516 cmd->stat_sn = conn->stat_sn++;
3517 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3519 iscsit_increment_maxcmdsn(cmd, conn->sess);
3521 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3522 * correctly increment MaxCmdSN for each response answering a
3523 * non immediate text request with a valid CmdSN.
3525 cmd->maxcmdsn_inc = 0;
3526 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3527 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3529 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3530 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3531 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3532 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3533 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3535 return text_length + padding;
3537 EXPORT_SYMBOL(iscsit_build_text_rsp);
3539 static int iscsit_send_text_rsp(
3540 struct iscsi_cmd *cmd,
3541 struct iscsi_conn *conn)
3543 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3546 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3547 conn->conn_transport->transport_type);
3548 if (text_length < 0)
3551 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3557 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3558 struct iscsi_reject *hdr)
3560 hdr->opcode = ISCSI_OP_REJECT;
3561 hdr->reason = cmd->reject_reason;
3562 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3563 hton24(hdr->dlength, ISCSI_HDR_LEN);
3564 hdr->ffffffff = cpu_to_be32(0xffffffff);
3565 cmd->stat_sn = conn->stat_sn++;
3566 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3567 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3568 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3571 EXPORT_SYMBOL(iscsit_build_reject);
3573 static int iscsit_send_reject(
3574 struct iscsi_cmd *cmd,
3575 struct iscsi_conn *conn)
3577 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3579 iscsit_build_reject(cmd, conn, hdr);
3581 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3582 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3584 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3589 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3593 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3594 * within iscsit_start_kthreads()
3596 * Here we use bitmap_id to determine which CPU that this
3597 * iSCSI connection's RX/TX threads will be scheduled to
3600 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3601 for_each_online_cpu(cpu) {
3603 cpumask_set_cpu(cpu, conn->conn_cpumask);
3608 * This should never be reached..
3611 cpumask_setall(conn->conn_cpumask);
3615 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3620 case ISTATE_SEND_R2T:
3621 ret = iscsit_send_r2t(cmd, conn);
3626 spin_lock_bh(&conn->cmd_lock);
3627 list_del_init(&cmd->i_conn_node);
3628 spin_unlock_bh(&conn->cmd_lock);
3630 iscsit_free_cmd(cmd, false);
3632 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3633 iscsit_mod_nopin_response_timer(conn);
3634 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3638 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3639 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3644 pr_err("Unknown Opcode: 0x%02x ITT:"
3645 " 0x%08x, i_state: %d on CID: %hu\n",
3646 cmd->iscsi_opcode, cmd->init_task_tag, state,
3656 EXPORT_SYMBOL(iscsit_immediate_queue);
3659 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3661 struct iscsit_transport *t = conn->conn_transport;
3662 struct iscsi_queue_req *qr;
3663 struct iscsi_cmd *cmd;
3667 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3668 atomic_set(&conn->check_immediate_queue, 0);
3671 kmem_cache_free(lio_qr_cache, qr);
3673 ret = t->iscsit_immediate_queue(conn, cmd, state);
3682 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3688 case ISTATE_SEND_DATAIN:
3689 ret = iscsit_send_datain(cmd, conn);
3694 goto check_rsp_state;
3695 else if (ret == 1) {
3697 spin_lock_bh(&cmd->istate_lock);
3698 cmd->i_state = ISTATE_SENT_STATUS;
3699 spin_unlock_bh(&cmd->istate_lock);
3701 if (atomic_read(&conn->check_immediate_queue))
3705 } else if (ret == 2) {
3706 /* Still must send status,
3707 SCF_TRANSPORT_TASK_SENSE was set */
3708 spin_lock_bh(&cmd->istate_lock);
3709 cmd->i_state = ISTATE_SEND_STATUS;
3710 spin_unlock_bh(&cmd->istate_lock);
3711 state = ISTATE_SEND_STATUS;
3712 goto check_rsp_state;
3716 case ISTATE_SEND_STATUS:
3717 case ISTATE_SEND_STATUS_RECOVERY:
3718 ret = iscsit_send_response(cmd, conn);
3720 case ISTATE_SEND_LOGOUTRSP:
3721 ret = iscsit_send_logout(cmd, conn);
3723 case ISTATE_SEND_ASYNCMSG:
3724 ret = iscsit_send_conn_drop_async_message(
3727 case ISTATE_SEND_NOPIN:
3728 ret = iscsit_send_nopin(cmd, conn);
3730 case ISTATE_SEND_REJECT:
3731 ret = iscsit_send_reject(cmd, conn);
3733 case ISTATE_SEND_TASKMGTRSP:
3734 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3737 ret = iscsit_tmr_post_handler(cmd, conn);
3739 iscsit_fall_back_to_erl0(conn->sess);
3741 case ISTATE_SEND_TEXTRSP:
3742 ret = iscsit_send_text_rsp(cmd, conn);
3745 pr_err("Unknown Opcode: 0x%02x ITT:"
3746 " 0x%08x, i_state: %d on CID: %hu\n",
3747 cmd->iscsi_opcode, cmd->init_task_tag,
3755 case ISTATE_SEND_LOGOUTRSP:
3756 if (!iscsit_logout_post_handler(cmd, conn))
3759 case ISTATE_SEND_STATUS:
3760 case ISTATE_SEND_ASYNCMSG:
3761 case ISTATE_SEND_NOPIN:
3762 case ISTATE_SEND_STATUS_RECOVERY:
3763 case ISTATE_SEND_TEXTRSP:
3764 case ISTATE_SEND_TASKMGTRSP:
3765 case ISTATE_SEND_REJECT:
3766 spin_lock_bh(&cmd->istate_lock);
3767 cmd->i_state = ISTATE_SENT_STATUS;
3768 spin_unlock_bh(&cmd->istate_lock);
3771 pr_err("Unknown Opcode: 0x%02x ITT:"
3772 " 0x%08x, i_state: %d on CID: %hu\n",
3773 cmd->iscsi_opcode, cmd->init_task_tag,
3774 cmd->i_state, conn->cid);
3778 if (atomic_read(&conn->check_immediate_queue))
3786 EXPORT_SYMBOL(iscsit_response_queue);
3788 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3790 struct iscsit_transport *t = conn->conn_transport;
3791 struct iscsi_queue_req *qr;
3792 struct iscsi_cmd *cmd;
3796 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3799 kmem_cache_free(lio_qr_cache, qr);
3801 ret = t->iscsit_response_queue(conn, cmd, state);
3802 if (ret == 1 || ret < 0)
3809 int iscsi_target_tx_thread(void *arg)
3812 struct iscsi_conn *conn = arg;
3813 bool conn_freed = false;
3816 * Allow ourselves to be interrupted by SIGINT so that a
3817 * connection recovery / failure event can be triggered externally.
3819 allow_signal(SIGINT);
3821 while (!kthread_should_stop()) {
3823 * Ensure that both TX and RX per connection kthreads
3824 * are scheduled to run on the same CPU.
3826 iscsit_thread_check_cpumask(conn, current, 1);
3828 wait_event_interruptible(conn->queues_wq,
3829 !iscsit_conn_all_queues_empty(conn));
3831 if (signal_pending(current))
3835 ret = iscsit_handle_immediate_queue(conn);
3839 ret = iscsit_handle_response_queue(conn);
3842 } else if (ret == -ECONNRESET) {
3845 } else if (ret < 0) {
3852 * Avoid the normal connection failure code-path if this connection
3853 * is still within LOGIN mode, and iscsi_np process context is
3854 * responsible for cleaning up the early connection failure.
3856 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3857 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3860 while (!kthread_should_stop()) {
3867 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3869 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3870 struct iscsi_cmd *cmd;
3873 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3874 case ISCSI_OP_SCSI_CMD:
3875 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3879 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3881 case ISCSI_OP_SCSI_DATA_OUT:
3882 ret = iscsit_handle_data_out(conn, buf);
3884 case ISCSI_OP_NOOP_OUT:
3886 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3887 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3891 ret = iscsit_handle_nop_out(conn, cmd, buf);
3893 case ISCSI_OP_SCSI_TMFUNC:
3894 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3898 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3901 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3902 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3906 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3911 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3913 case ISCSI_OP_LOGOUT:
3914 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3918 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3920 wait_for_completion_timeout(&conn->conn_logout_comp,
3921 SECONDS_FOR_LOGOUT_COMP * HZ);
3923 case ISCSI_OP_SNACK:
3924 ret = iscsit_handle_snack(conn, buf);
3927 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3928 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3929 pr_err("Cannot recover from unknown"
3930 " opcode while ERL=0, closing iSCSI connection.\n");
3933 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3934 " closing iSCSI connection.\n");
3941 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3944 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3948 spin_lock_bh(&conn->state_lock);
3949 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3950 spin_unlock_bh(&conn->state_lock);
3955 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3959 u32 checksum = 0, digest = 0;
3962 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3966 while (!kthread_should_stop()) {
3968 * Ensure that both TX and RX per connection kthreads
3969 * are scheduled to run on the same CPU.
3971 iscsit_thread_check_cpumask(conn, current, 0);
3973 memset(&iov, 0, sizeof(struct kvec));
3975 iov.iov_base = buffer;
3976 iov.iov_len = ISCSI_HDR_LEN;
3978 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3979 if (ret != ISCSI_HDR_LEN) {
3980 iscsit_rx_thread_wait_for_tcp(conn);
3984 if (conn->conn_ops->HeaderDigest) {
3985 iov.iov_base = &digest;
3986 iov.iov_len = ISCSI_CRC_LEN;
3988 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3989 if (ret != ISCSI_CRC_LEN) {
3990 iscsit_rx_thread_wait_for_tcp(conn);
3994 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3995 buffer, ISCSI_HDR_LEN,
3996 0, NULL, (u8 *)&checksum);
3998 if (digest != checksum) {
3999 pr_err("HeaderDigest CRC32C failed,"
4000 " received 0x%08x, computed 0x%08x\n",
4003 * Set the PDU to 0xff so it will intentionally
4004 * hit default in the switch below.
4006 memset(buffer, 0xff, ISCSI_HDR_LEN);
4007 atomic_long_inc(&conn->sess->conn_digest_errors);
4009 pr_debug("Got HeaderDigest CRC32C"
4010 " 0x%08x\n", checksum);
4014 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4017 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4019 if (conn->sess->sess_ops->SessionType &&
4020 ((!(opcode & ISCSI_OP_TEXT)) ||
4021 (!(opcode & ISCSI_OP_LOGOUT)))) {
4022 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4023 " while in Discovery Session, rejecting.\n", opcode);
4024 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4029 ret = iscsi_target_rx_opcode(conn, buffer);
4037 int iscsi_target_rx_thread(void *arg)
4040 struct iscsi_conn *conn = arg;
4041 bool conn_freed = false;
4044 * Allow ourselves to be interrupted by SIGINT so that a
4045 * connection recovery / failure event can be triggered externally.
4047 allow_signal(SIGINT);
4049 * Wait for iscsi_post_login_handler() to complete before allowing
4050 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4052 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4053 if (rc < 0 || iscsi_target_check_conn_state(conn))
4056 if (!conn->conn_transport->iscsit_get_rx_pdu)
4059 conn->conn_transport->iscsit_get_rx_pdu(conn);
4061 if (!signal_pending(current))
4062 atomic_set(&conn->transport_failed, 1);
4063 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4067 while (!kthread_should_stop()) {
4075 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4077 LIST_HEAD(tmp_list);
4078 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4079 struct iscsi_session *sess = conn->sess;
4081 * We expect this function to only ever be called from either RX or TX
4082 * thread context via iscsit_close_connection() once the other context
4083 * has been reset -> returned sleeping pre-handler state.
4085 spin_lock_bh(&conn->cmd_lock);
4086 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4088 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4089 struct se_cmd *se_cmd = &cmd->se_cmd;
4091 if (se_cmd->se_tfo != NULL) {
4092 spin_lock_irq(&se_cmd->t_state_lock);
4093 if (se_cmd->transport_state & CMD_T_ABORTED) {
4095 * LIO's abort path owns the cleanup for this,
4096 * so put it back on the list and let
4097 * aborted_task handle it.
4099 list_move_tail(&cmd->i_conn_node,
4100 &conn->conn_cmd_list);
4102 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4104 spin_unlock_irq(&se_cmd->t_state_lock);
4107 spin_unlock_bh(&conn->cmd_lock);
4109 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4110 list_del_init(&cmd->i_conn_node);
4112 iscsit_increment_maxcmdsn(cmd, sess);
4113 iscsit_free_cmd(cmd, true);
4118 static void iscsit_stop_timers_for_cmds(
4119 struct iscsi_conn *conn)
4121 struct iscsi_cmd *cmd;
4123 spin_lock_bh(&conn->cmd_lock);
4124 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4125 if (cmd->data_direction == DMA_TO_DEVICE)
4126 iscsit_stop_dataout_timer(cmd);
4128 spin_unlock_bh(&conn->cmd_lock);
4131 int iscsit_close_connection(
4132 struct iscsi_conn *conn)
4134 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4135 struct iscsi_session *sess = conn->sess;
4137 pr_debug("Closing iSCSI connection CID %hu on SID:"
4138 " %u\n", conn->cid, sess->sid);
4140 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4141 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4142 * sleeping and the logout response never got sent because the
4143 * connection failed.
4145 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4146 * to signal logout response TX interrupt completion. Go ahead and skip
4147 * this for iser since isert_rx_opcode() does not wait on logout failure,
4148 * and to avoid iscsi_conn pointer dereference in iser-target code.
4150 if (!conn->conn_transport->rdma_shutdown)
4151 complete(&conn->conn_logout_comp);
4153 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4154 if (conn->tx_thread &&
4155 cmpxchg(&conn->tx_thread_active, true, false)) {
4156 send_sig(SIGINT, conn->tx_thread, 1);
4157 kthread_stop(conn->tx_thread);
4159 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4160 if (conn->rx_thread &&
4161 cmpxchg(&conn->rx_thread_active, true, false)) {
4162 send_sig(SIGINT, conn->rx_thread, 1);
4163 kthread_stop(conn->rx_thread);
4167 spin_lock(&iscsit_global->ts_bitmap_lock);
4168 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4170 spin_unlock(&iscsit_global->ts_bitmap_lock);
4172 iscsit_stop_timers_for_cmds(conn);
4173 iscsit_stop_nopin_response_timer(conn);
4174 iscsit_stop_nopin_timer(conn);
4176 if (conn->conn_transport->iscsit_wait_conn)
4177 conn->conn_transport->iscsit_wait_conn(conn);
4180 * During Connection recovery drop unacknowledged out of order
4181 * commands for this connection, and prepare the other commands
4184 * During normal operation clear the out of order commands (but
4185 * do not free the struct iscsi_ooo_cmdsn's) and release all
4186 * struct iscsi_cmds.
4188 if (atomic_read(&conn->connection_recovery)) {
4189 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4190 iscsit_prepare_cmds_for_reallegiance(conn);
4192 iscsit_clear_ooo_cmdsns_for_conn(conn);
4193 iscsit_release_commands_from_conn(conn);
4195 iscsit_free_queue_reqs_for_conn(conn);
4198 * Handle decrementing session or connection usage count if
4199 * a logout response was not able to be sent because the
4200 * connection failed. Fall back to Session Recovery here.
4202 if (atomic_read(&conn->conn_logout_remove)) {
4203 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4204 iscsit_dec_conn_usage_count(conn);
4205 iscsit_dec_session_usage_count(sess);
4207 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4208 iscsit_dec_conn_usage_count(conn);
4210 atomic_set(&conn->conn_logout_remove, 0);
4211 atomic_set(&sess->session_reinstatement, 0);
4212 atomic_set(&sess->session_fall_back_to_erl0, 1);
4215 spin_lock_bh(&sess->conn_lock);
4216 list_del(&conn->conn_list);
4219 * Attempt to let the Initiator know this connection failed by
4220 * sending an Connection Dropped Async Message on another
4221 * active connection.
4223 if (atomic_read(&conn->connection_recovery))
4224 iscsit_build_conn_drop_async_message(conn);
4226 spin_unlock_bh(&sess->conn_lock);
4229 * If connection reinstatement is being performed on this connection,
4230 * up the connection reinstatement semaphore that is being blocked on
4231 * in iscsit_cause_connection_reinstatement().
4233 spin_lock_bh(&conn->state_lock);
4234 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4235 spin_unlock_bh(&conn->state_lock);
4236 complete(&conn->conn_wait_comp);
4237 wait_for_completion(&conn->conn_post_wait_comp);
4238 spin_lock_bh(&conn->state_lock);
4242 * If connection reinstatement is being performed on this connection
4243 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4244 * connection wait rcfr semaphore that is being blocked on
4245 * an iscsit_connection_reinstatement_rcfr().
4247 if (atomic_read(&conn->connection_wait_rcfr)) {
4248 spin_unlock_bh(&conn->state_lock);
4249 complete(&conn->conn_wait_rcfr_comp);
4250 wait_for_completion(&conn->conn_post_wait_comp);
4251 spin_lock_bh(&conn->state_lock);
4253 atomic_set(&conn->connection_reinstatement, 1);
4254 spin_unlock_bh(&conn->state_lock);
4257 * If any other processes are accessing this connection pointer we
4258 * must wait until they have completed.
4260 iscsit_check_conn_usage_count(conn);
4262 ahash_request_free(conn->conn_tx_hash);
4263 if (conn->conn_rx_hash) {
4264 struct crypto_ahash *tfm;
4266 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4267 ahash_request_free(conn->conn_rx_hash);
4268 crypto_free_ahash(tfm);
4271 free_cpumask_var(conn->conn_cpumask);
4273 kfree(conn->conn_ops);
4274 conn->conn_ops = NULL;
4277 sock_release(conn->sock);
4279 if (conn->conn_transport->iscsit_free_conn)
4280 conn->conn_transport->iscsit_free_conn(conn);
4282 iscsit_put_transport(conn->conn_transport);
4284 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4285 conn->conn_state = TARG_CONN_STATE_FREE;
4288 spin_lock_bh(&sess->conn_lock);
4289 atomic_dec(&sess->nconn);
4290 pr_debug("Decremented iSCSI connection count to %hu from node:"
4291 " %s\n", atomic_read(&sess->nconn),
4292 sess->sess_ops->InitiatorName);
4294 * Make sure that if one connection fails in an non ERL=2 iSCSI
4295 * Session that they all fail.
4297 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4298 !atomic_read(&sess->session_logout))
4299 atomic_set(&sess->session_fall_back_to_erl0, 1);
4302 * If this was not the last connection in the session, and we are
4303 * performing session reinstatement or falling back to ERL=0, call
4304 * iscsit_stop_session() without sleeping to shutdown the other
4305 * active connections.
4307 if (atomic_read(&sess->nconn)) {
4308 if (!atomic_read(&sess->session_reinstatement) &&
4309 !atomic_read(&sess->session_fall_back_to_erl0)) {
4310 spin_unlock_bh(&sess->conn_lock);
4313 if (!atomic_read(&sess->session_stop_active)) {
4314 atomic_set(&sess->session_stop_active, 1);
4315 spin_unlock_bh(&sess->conn_lock);
4316 iscsit_stop_session(sess, 0, 0);
4319 spin_unlock_bh(&sess->conn_lock);
4324 * If this was the last connection in the session and one of the
4325 * following is occurring:
4327 * Session Reinstatement is not being performed, and are falling back
4328 * to ERL=0 call iscsit_close_session().
4330 * Session Logout was requested. iscsit_close_session() will be called
4333 * Session Continuation is not being performed, start the Time2Retain
4334 * handler and check if sleep_on_sess_wait_sem is active.
4336 if (!atomic_read(&sess->session_reinstatement) &&
4337 atomic_read(&sess->session_fall_back_to_erl0)) {
4338 spin_unlock_bh(&sess->conn_lock);
4339 complete_all(&sess->session_wait_comp);
4340 iscsit_close_session(sess);
4343 } else if (atomic_read(&sess->session_logout)) {
4344 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4345 sess->session_state = TARG_SESS_STATE_FREE;
4347 if (atomic_read(&sess->session_close)) {
4348 spin_unlock_bh(&sess->conn_lock);
4349 complete_all(&sess->session_wait_comp);
4350 iscsit_close_session(sess);
4352 spin_unlock_bh(&sess->conn_lock);
4357 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4358 sess->session_state = TARG_SESS_STATE_FAILED;
4360 if (!atomic_read(&sess->session_continuation))
4361 iscsit_start_time2retain_handler(sess);
4363 if (atomic_read(&sess->session_close)) {
4364 spin_unlock_bh(&sess->conn_lock);
4365 complete_all(&sess->session_wait_comp);
4366 iscsit_close_session(sess);
4368 spin_unlock_bh(&sess->conn_lock);
4376 * If the iSCSI Session for the iSCSI Initiator Node exists,
4377 * forcefully shutdown the iSCSI NEXUS.
4379 int iscsit_close_session(struct iscsi_session *sess)
4381 struct iscsi_portal_group *tpg = sess->tpg;
4382 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4384 if (atomic_read(&sess->nconn)) {
4385 pr_err("%d connection(s) still exist for iSCSI session"
4386 " to %s\n", atomic_read(&sess->nconn),
4387 sess->sess_ops->InitiatorName);
4391 spin_lock_bh(&se_tpg->session_lock);
4392 atomic_set(&sess->session_logout, 1);
4393 atomic_set(&sess->session_reinstatement, 1);
4394 iscsit_stop_time2retain_timer(sess);
4395 spin_unlock_bh(&se_tpg->session_lock);
4398 * transport_deregister_session_configfs() will clear the
4399 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4400 * can be setting it again with __transport_register_session() in
4401 * iscsi_post_login_handler() again after the iscsit_stop_session()
4402 * completes in iscsi_np context.
4404 transport_deregister_session_configfs(sess->se_sess);
4407 * If any other processes are accessing this session pointer we must
4408 * wait until they have completed. If we are in an interrupt (the
4409 * time2retain handler) and contain and active session usage count we
4410 * restart the timer and exit.
4412 if (!in_interrupt()) {
4413 if (iscsit_check_session_usage_count(sess) == 1)
4414 iscsit_stop_session(sess, 1, 1);
4416 if (iscsit_check_session_usage_count(sess) == 2) {
4417 atomic_set(&sess->session_logout, 0);
4418 iscsit_start_time2retain_handler(sess);
4423 transport_deregister_session(sess->se_sess);
4425 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4426 iscsit_free_connection_recovery_entires(sess);
4428 iscsit_free_all_ooo_cmdsns(sess);
4430 spin_lock_bh(&se_tpg->session_lock);
4431 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4432 sess->session_state = TARG_SESS_STATE_FREE;
4433 pr_debug("Released iSCSI session from node: %s\n",
4434 sess->sess_ops->InitiatorName);
4437 tpg->tpg_tiqn->tiqn_nsessions--;
4439 pr_debug("Decremented number of active iSCSI Sessions on"
4440 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4442 spin_lock(&sess_idr_lock);
4443 idr_remove(&sess_idr, sess->session_index);
4444 spin_unlock(&sess_idr_lock);
4446 kfree(sess->sess_ops);
4447 sess->sess_ops = NULL;
4448 spin_unlock_bh(&se_tpg->session_lock);
4454 static void iscsit_logout_post_handler_closesession(
4455 struct iscsi_conn *conn)
4457 struct iscsi_session *sess = conn->sess;
4460 * Traditional iscsi/tcp will invoke this logic from TX thread
4461 * context during session logout, so clear tx_thread_active and
4462 * sleep if iscsit_close_connection() has not already occured.
4464 * Since iser-target invokes this logic from it's own workqueue,
4465 * always sleep waiting for RX/TX thread shutdown to complete
4466 * within iscsit_close_connection().
4468 if (!conn->conn_transport->rdma_shutdown) {
4469 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4474 atomic_set(&conn->conn_logout_remove, 0);
4475 complete(&conn->conn_logout_comp);
4477 iscsit_dec_conn_usage_count(conn);
4478 atomic_set(&sess->session_close, 1);
4479 iscsit_stop_session(sess, sleep, sleep);
4480 iscsit_dec_session_usage_count(sess);
4483 static void iscsit_logout_post_handler_samecid(
4484 struct iscsi_conn *conn)
4488 if (!conn->conn_transport->rdma_shutdown) {
4489 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4494 atomic_set(&conn->conn_logout_remove, 0);
4495 complete(&conn->conn_logout_comp);
4497 iscsit_cause_connection_reinstatement(conn, sleep);
4498 iscsit_dec_conn_usage_count(conn);
4501 static void iscsit_logout_post_handler_diffcid(
4502 struct iscsi_conn *conn,
4505 struct iscsi_conn *l_conn;
4506 struct iscsi_session *sess = conn->sess;
4507 bool conn_found = false;
4512 spin_lock_bh(&sess->conn_lock);
4513 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4514 if (l_conn->cid == cid) {
4515 iscsit_inc_conn_usage_count(l_conn);
4520 spin_unlock_bh(&sess->conn_lock);
4526 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4528 spin_lock_bh(&l_conn->state_lock);
4529 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4530 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4531 spin_unlock_bh(&l_conn->state_lock);
4533 iscsit_cause_connection_reinstatement(l_conn, 1);
4534 iscsit_dec_conn_usage_count(l_conn);
4538 * Return of 0 causes the TX thread to restart.
4540 int iscsit_logout_post_handler(
4541 struct iscsi_cmd *cmd,
4542 struct iscsi_conn *conn)
4546 switch (cmd->logout_reason) {
4547 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4548 switch (cmd->logout_response) {
4549 case ISCSI_LOGOUT_SUCCESS:
4550 case ISCSI_LOGOUT_CLEANUP_FAILED:
4552 iscsit_logout_post_handler_closesession(conn);
4557 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4558 if (conn->cid == cmd->logout_cid) {
4559 switch (cmd->logout_response) {
4560 case ISCSI_LOGOUT_SUCCESS:
4561 case ISCSI_LOGOUT_CLEANUP_FAILED:
4563 iscsit_logout_post_handler_samecid(conn);
4568 switch (cmd->logout_response) {
4569 case ISCSI_LOGOUT_SUCCESS:
4570 iscsit_logout_post_handler_diffcid(conn,
4573 case ISCSI_LOGOUT_CID_NOT_FOUND:
4574 case ISCSI_LOGOUT_CLEANUP_FAILED:
4581 case ISCSI_LOGOUT_REASON_RECOVERY:
4582 switch (cmd->logout_response) {
4583 case ISCSI_LOGOUT_SUCCESS:
4584 case ISCSI_LOGOUT_CID_NOT_FOUND:
4585 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4586 case ISCSI_LOGOUT_CLEANUP_FAILED:
4598 EXPORT_SYMBOL(iscsit_logout_post_handler);
4600 void iscsit_fail_session(struct iscsi_session *sess)
4602 struct iscsi_conn *conn;
4604 spin_lock_bh(&sess->conn_lock);
4605 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4606 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4607 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4609 spin_unlock_bh(&sess->conn_lock);
4611 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4612 sess->session_state = TARG_SESS_STATE_FAILED;
4615 void iscsit_stop_session(
4616 struct iscsi_session *sess,
4618 int connection_sleep)
4620 u16 conn_count = atomic_read(&sess->nconn);
4621 struct iscsi_conn *conn, *conn_tmp = NULL;
4624 spin_lock_bh(&sess->conn_lock);
4626 if (connection_sleep) {
4627 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4629 if (conn_count == 0)
4632 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4635 iscsit_inc_conn_usage_count(conn_tmp);
4638 iscsit_inc_conn_usage_count(conn);
4640 spin_unlock_bh(&sess->conn_lock);
4641 iscsit_cause_connection_reinstatement(conn, 1);
4642 spin_lock_bh(&sess->conn_lock);
4644 iscsit_dec_conn_usage_count(conn);
4646 iscsit_dec_conn_usage_count(conn_tmp);
4650 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4651 iscsit_cause_connection_reinstatement(conn, 0);
4654 if (session_sleep && atomic_read(&sess->nconn)) {
4655 spin_unlock_bh(&sess->conn_lock);
4656 wait_for_completion(&sess->session_wait_comp);
4658 spin_unlock_bh(&sess->conn_lock);
4661 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4663 struct iscsi_session *sess;
4664 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4665 struct se_session *se_sess, *se_sess_tmp;
4666 LIST_HEAD(free_list);
4667 int session_count = 0;
4669 spin_lock_bh(&se_tpg->session_lock);
4670 if (tpg->nsessions && !force) {
4671 spin_unlock_bh(&se_tpg->session_lock);
4675 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4677 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4679 spin_lock(&sess->conn_lock);
4680 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4681 atomic_read(&sess->session_logout) ||
4682 atomic_read(&sess->session_close) ||
4683 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4684 spin_unlock(&sess->conn_lock);
4687 iscsit_inc_session_usage_count(sess);
4688 atomic_set(&sess->session_reinstatement, 1);
4689 atomic_set(&sess->session_fall_back_to_erl0, 1);
4690 atomic_set(&sess->session_close, 1);
4691 spin_unlock(&sess->conn_lock);
4693 list_move_tail(&se_sess->sess_list, &free_list);
4695 spin_unlock_bh(&se_tpg->session_lock);
4697 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4698 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4700 list_del_init(&se_sess->sess_list);
4701 iscsit_stop_session(sess, 1, 1);
4702 iscsit_dec_session_usage_count(sess);
4706 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4707 " Group: %hu\n", session_count, tpg->tpgt);
4711 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4712 MODULE_VERSION("4.1.x");
4713 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4714 MODULE_LICENSE("GPL");
4716 module_init(iscsi_target_init_module);
4717 module_exit(iscsi_target_cleanup_module);