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;
423 spin_unlock_bh(&np->np_thread_lock);
424 send_sig(SIGINT, np->np_thread, 1);
425 wait_for_completion(&np->np_restart_comp);
426 spin_lock_bh(&np->np_thread_lock);
428 spin_unlock_bh(&np->np_thread_lock);
430 if (tpg_np && shutdown) {
431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
433 wait_for_completion(&tpg_np->tpg_np_comp);
439 static void iscsit_free_np(struct iscsi_np *np)
442 sock_release(np->np_socket);
445 int iscsit_del_np(struct iscsi_np *np)
447 spin_lock_bh(&np->np_thread_lock);
449 if (np->np_exports) {
451 spin_unlock_bh(&np->np_thread_lock);
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
464 np->np_thread = NULL;
467 np->np_transport->iscsit_free_np(np);
469 mutex_lock(&np_lock);
470 list_del(&np->np_list);
471 mutex_unlock(&np_lock);
473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np->np_sockaddr, np->np_transport->name);
476 iscsit_put_transport(np->np_transport);
481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
485 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
487 EXPORT_SYMBOL(iscsit_queue_rsp);
489 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
491 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
493 spin_lock_bh(&conn->cmd_lock);
494 if (!list_empty(&cmd->i_conn_node) &&
495 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
499 __iscsit_free_cmd(cmd, scsi_cmd, true);
501 EXPORT_SYMBOL(iscsit_aborted_task);
503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
504 u32, u32, u8 *, u8 *);
505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
509 const void *data_buf, u32 data_buf_len)
511 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
516 iov = &cmd->iov_misc[0];
517 iov[niov].iov_base = cmd->pdu;
518 iov[niov++].iov_len = ISCSI_HDR_LEN;
520 if (conn->conn_ops->HeaderDigest) {
521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
524 ISCSI_HDR_LEN, 0, NULL,
525 (u8 *)header_digest);
527 iov[0].iov_len += ISCSI_CRC_LEN;
528 tx_size += ISCSI_CRC_LEN;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr->opcode, *header_digest);
535 u32 padding = ((-data_buf_len) & 3);
537 iov[niov].iov_base = (void *)data_buf;
538 iov[niov++].iov_len = data_buf_len;
539 tx_size += data_buf_len;
542 iov[niov].iov_base = &cmd->pad_bytes;
543 iov[niov++].iov_len = padding;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding);
549 if (conn->conn_ops->DataDigest) {
550 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
551 data_buf, data_buf_len,
553 (u8 *)&cmd->pad_bytes,
554 (u8 *)&cmd->data_crc);
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
568 ret = iscsit_send_tx_data(cmd, conn, 1);
570 iscsit_tx_thread_wait_for_tcp(conn);
577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
586 u32 iov_count = 0, tx_size = 0;
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
599 (u8 *)header_digest);
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
613 iov_count += iov_ret;
614 tx_size += datain->length;
616 cmd->padding = ((-datain->length) & 3);
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
645 iscsit_unmap_iovec(cmd);
648 iscsit_tx_thread_wait_for_tcp(conn);
655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
667 return TARGET_PROT_NORMAL;
670 static struct iscsit_transport iscsi_target_transport = {
672 .transport_type = ISCSI_TCP,
673 .rdma_shutdown = false,
675 .iscsit_setup_np = iscsit_setup_np,
676 .iscsit_accept_np = iscsit_accept_np,
677 .iscsit_free_np = iscsit_free_np,
678 .iscsit_get_login_rx = iscsit_get_login_rx,
679 .iscsit_put_login_tx = iscsit_put_login_tx,
680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
681 .iscsit_immediate_queue = iscsit_immediate_queue,
682 .iscsit_response_queue = iscsit_response_queue,
683 .iscsit_queue_data_in = iscsit_queue_rsp,
684 .iscsit_queue_status = iscsit_queue_rsp,
685 .iscsit_aborted_task = iscsit_aborted_task,
686 .iscsit_xmit_pdu = iscsit_xmit_pdu,
687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
691 static int __init iscsi_target_init_module(void)
695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
696 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
700 spin_lock_init(&iscsit_global->ts_bitmap_lock);
701 mutex_init(&auth_id_lock);
702 spin_lock_init(&sess_idr_lock);
706 ret = target_register_template(&iscsi_ops);
710 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
711 iscsit_global->ts_bitmap = vzalloc(size);
712 if (!iscsit_global->ts_bitmap)
715 lio_qr_cache = kmem_cache_create("lio_qr_cache",
716 sizeof(struct iscsi_queue_req),
717 __alignof__(struct iscsi_queue_req), 0, NULL);
719 pr_err("nable to kmem_cache_create() for"
724 lio_dr_cache = kmem_cache_create("lio_dr_cache",
725 sizeof(struct iscsi_datain_req),
726 __alignof__(struct iscsi_datain_req), 0, NULL);
728 pr_err("Unable to kmem_cache_create() for"
733 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
734 sizeof(struct iscsi_ooo_cmdsn),
735 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
736 if (!lio_ooo_cache) {
737 pr_err("Unable to kmem_cache_create() for"
742 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
743 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
745 if (!lio_r2t_cache) {
746 pr_err("Unable to kmem_cache_create() for"
751 iscsit_register_transport(&iscsi_target_transport);
753 if (iscsit_load_discovery_tpg() < 0)
758 iscsit_unregister_transport(&iscsi_target_transport);
759 kmem_cache_destroy(lio_r2t_cache);
761 kmem_cache_destroy(lio_ooo_cache);
763 kmem_cache_destroy(lio_dr_cache);
765 kmem_cache_destroy(lio_qr_cache);
767 vfree(iscsit_global->ts_bitmap);
769 /* XXX: this probably wants it to be it's own unwind step.. */
770 if (iscsit_global->discovery_tpg)
771 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
772 target_unregister_template(&iscsi_ops);
774 kfree(iscsit_global);
778 static void __exit iscsi_target_cleanup_module(void)
780 iscsit_release_discovery_tpg();
781 iscsit_unregister_transport(&iscsi_target_transport);
782 kmem_cache_destroy(lio_qr_cache);
783 kmem_cache_destroy(lio_dr_cache);
784 kmem_cache_destroy(lio_ooo_cache);
785 kmem_cache_destroy(lio_r2t_cache);
788 * Shutdown discovery sessions and disable discovery TPG
790 if (iscsit_global->discovery_tpg)
791 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
793 target_unregister_template(&iscsi_ops);
795 vfree(iscsit_global->ts_bitmap);
796 kfree(iscsit_global);
799 int iscsit_add_reject(
800 struct iscsi_conn *conn,
804 struct iscsi_cmd *cmd;
806 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
810 cmd->iscsi_opcode = ISCSI_OP_REJECT;
811 cmd->reject_reason = reason;
813 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
815 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
816 iscsit_free_cmd(cmd, false);
820 spin_lock_bh(&conn->cmd_lock);
821 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
822 spin_unlock_bh(&conn->cmd_lock);
824 cmd->i_state = ISTATE_SEND_REJECT;
825 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
829 EXPORT_SYMBOL(iscsit_add_reject);
831 static int iscsit_add_reject_from_cmd(
832 struct iscsi_cmd *cmd,
837 struct iscsi_conn *conn;
840 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
846 cmd->iscsi_opcode = ISCSI_OP_REJECT;
847 cmd->reject_reason = reason;
849 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
851 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
852 iscsit_free_cmd(cmd, false);
857 spin_lock_bh(&conn->cmd_lock);
858 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
859 spin_unlock_bh(&conn->cmd_lock);
862 cmd->i_state = ISTATE_SEND_REJECT;
863 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
865 * Perform the kref_put now if se_cmd has already been setup by
866 * scsit_setup_scsi_cmd()
868 if (cmd->se_cmd.se_tfo != NULL) {
869 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
870 target_put_sess_cmd(&cmd->se_cmd);
875 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
878 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
881 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
883 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
885 EXPORT_SYMBOL(iscsit_reject_cmd);
888 * Map some portion of the allocated scatterlist to an iovec, suitable for
889 * kernel sockets to copy data in/out.
891 static int iscsit_map_iovec(
892 struct iscsi_cmd *cmd,
898 struct scatterlist *sg;
899 unsigned int page_off;
902 * We know each entry in t_data_sg contains a page.
904 u32 ent = data_offset / PAGE_SIZE;
906 if (ent >= cmd->se_cmd.t_data_nents) {
907 pr_err("Initial page entry out-of-bounds\n");
911 sg = &cmd->se_cmd.t_data_sg[ent];
912 page_off = (data_offset % PAGE_SIZE);
914 cmd->first_data_sg = sg;
915 cmd->first_data_sg_off = page_off;
917 while (data_length) {
918 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
920 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
921 iov[i].iov_len = cur_len;
923 data_length -= cur_len;
929 cmd->kmapped_nents = i;
934 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
937 struct scatterlist *sg;
939 sg = cmd->first_data_sg;
941 for (i = 0; i < cmd->kmapped_nents; i++)
942 kunmap(sg_page(&sg[i]));
945 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
948 struct iscsi_cmd *cmd, *cmd_p;
950 conn->exp_statsn = exp_statsn;
952 if (conn->sess->sess_ops->RDMAExtensions)
955 spin_lock_bh(&conn->cmd_lock);
956 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
957 spin_lock(&cmd->istate_lock);
958 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
959 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
960 cmd->i_state = ISTATE_REMOVE;
961 spin_unlock(&cmd->istate_lock);
962 list_move_tail(&cmd->i_conn_node, &ack_list);
965 spin_unlock(&cmd->istate_lock);
967 spin_unlock_bh(&conn->cmd_lock);
969 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
970 list_del_init(&cmd->i_conn_node);
971 iscsit_free_cmd(cmd, false);
975 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
977 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
979 iov_count += ISCSI_IOV_DATA_BUFFER;
980 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
984 cmd->orig_iov_data_count = iov_count;
988 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
991 int data_direction, payload_length;
992 struct iscsi_scsi_req *hdr;
996 atomic_long_inc(&conn->sess->cmd_pdus);
998 hdr = (struct iscsi_scsi_req *) buf;
999 payload_length = ntoh24(hdr->dlength);
1001 /* FIXME; Add checks for AdditionalHeaderSegment */
1003 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1004 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1005 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1006 " not set. Bad iSCSI Initiator.\n");
1007 return iscsit_add_reject_cmd(cmd,
1008 ISCSI_REASON_BOOKMARK_INVALID, buf);
1011 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1012 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1014 * From RFC-3720 Section 10.3.1:
1016 * "Either or both of R and W MAY be 1 when either the
1017 * Expected Data Transfer Length and/or Bidirectional Read
1018 * Expected Data Transfer Length are 0"
1020 * For this case, go ahead and clear the unnecssary bits
1021 * to avoid any confusion with ->data_direction.
1023 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1024 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1026 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1027 " set when Expected Data Transfer Length is 0 for"
1028 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1031 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1032 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1033 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1034 " MUST be set if Expected Data Transfer Length is not 0."
1035 " Bad iSCSI Initiator\n");
1036 return iscsit_add_reject_cmd(cmd,
1037 ISCSI_REASON_BOOKMARK_INVALID, buf);
1040 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1041 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1042 pr_err("Bidirectional operations not supported!\n");
1043 return iscsit_add_reject_cmd(cmd,
1044 ISCSI_REASON_BOOKMARK_INVALID, buf);
1047 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1048 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1049 " Scsi Command PDU.\n");
1050 return iscsit_add_reject_cmd(cmd,
1051 ISCSI_REASON_BOOKMARK_INVALID, buf);
1054 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1055 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1056 " protocol error.\n", payload_length);
1057 return iscsit_add_reject_cmd(cmd,
1058 ISCSI_REASON_PROTOCOL_ERROR, buf);
1061 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1062 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1063 pr_err("Expected Data Transfer Length and Length of"
1064 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1065 " bit is not set protocol error\n");
1066 return iscsit_add_reject_cmd(cmd,
1067 ISCSI_REASON_PROTOCOL_ERROR, buf);
1070 if (payload_length > be32_to_cpu(hdr->data_length)) {
1071 pr_err("DataSegmentLength: %u is greater than"
1072 " EDTL: %u, protocol error.\n", payload_length,
1074 return iscsit_add_reject_cmd(cmd,
1075 ISCSI_REASON_PROTOCOL_ERROR, buf);
1078 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1079 pr_err("DataSegmentLength: %u is greater than"
1080 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1081 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1082 return iscsit_add_reject_cmd(cmd,
1083 ISCSI_REASON_PROTOCOL_ERROR, buf);
1086 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1087 pr_err("DataSegmentLength: %u is greater than"
1088 " FirstBurstLength: %u, protocol error.\n",
1089 payload_length, conn->sess->sess_ops->FirstBurstLength);
1090 return iscsit_add_reject_cmd(cmd,
1091 ISCSI_REASON_BOOKMARK_INVALID, buf);
1094 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1095 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1098 cmd->data_direction = data_direction;
1099 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1101 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1103 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1104 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1105 sam_task_attr = TCM_SIMPLE_TAG;
1106 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1107 sam_task_attr = TCM_ORDERED_TAG;
1108 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1109 sam_task_attr = TCM_HEAD_TAG;
1110 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1111 sam_task_attr = TCM_ACA_TAG;
1113 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1114 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1115 sam_task_attr = TCM_SIMPLE_TAG;
1118 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1119 cmd->i_state = ISTATE_NEW_CMD;
1120 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1121 cmd->immediate_data = (payload_length) ? 1 : 0;
1122 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1123 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1124 if (cmd->unsolicited_data)
1125 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1127 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1128 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1129 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1131 cmd->targ_xfer_tag = 0xFFFFFFFF;
1132 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1133 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1134 cmd->first_burst_len = payload_length;
1136 if (!conn->sess->sess_ops->RDMAExtensions &&
1137 cmd->data_direction == DMA_FROM_DEVICE) {
1138 struct iscsi_datain_req *dr;
1140 dr = iscsit_allocate_datain_req();
1142 return iscsit_add_reject_cmd(cmd,
1143 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1145 iscsit_attach_datain_req(cmd, dr);
1149 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1151 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1152 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1153 cmd->data_direction, sam_task_attr,
1154 cmd->sense_buffer + 2);
1156 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1157 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1158 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1161 target_get_sess_cmd(&cmd->se_cmd, true);
1163 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1164 scsilun_to_int(&hdr->lun));
1165 if (cmd->sense_reason)
1168 /* only used for printks or comparing with ->ref_task_tag */
1169 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1170 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1171 if (cmd->sense_reason) {
1172 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1173 return iscsit_add_reject_cmd(cmd,
1174 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1180 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1181 return iscsit_add_reject_cmd(cmd,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1186 spin_lock_bh(&conn->cmd_lock);
1187 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1188 spin_unlock_bh(&conn->cmd_lock);
1190 * Check if we need to delay processing because of ALUA
1191 * Active/NonOptimized primary access state..
1193 core_alua_check_nonop_delay(&cmd->se_cmd);
1197 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1199 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1201 iscsit_set_dataout_sequence_values(cmd);
1203 spin_lock_bh(&cmd->dataout_timeout_lock);
1204 iscsit_start_dataout_timer(cmd, cmd->conn);
1205 spin_unlock_bh(&cmd->dataout_timeout_lock);
1207 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1209 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1210 struct iscsi_scsi_req *hdr)
1214 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1215 * the Immediate Bit is not set, and no Immediate
1218 * A PDU/CmdSN carrying Immediate Data can only
1219 * be processed after the DataCRC has passed.
1220 * If the DataCRC fails, the CmdSN MUST NOT
1221 * be acknowledged. (See below)
1223 if (!cmd->immediate_data) {
1224 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1225 (unsigned char *)hdr, hdr->cmdsn);
1226 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1228 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1229 target_put_sess_cmd(&cmd->se_cmd);
1234 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1237 * If no Immediate Data is attached, it's OK to return now.
1239 if (!cmd->immediate_data) {
1240 if (!cmd->sense_reason && cmd->unsolicited_data)
1241 iscsit_set_unsoliticed_dataout(cmd);
1242 if (!cmd->sense_reason)
1245 target_put_sess_cmd(&cmd->se_cmd);
1250 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1251 * execution. These exceptions are processed in CmdSN order using
1252 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1254 if (cmd->sense_reason) {
1255 if (cmd->reject_reason)
1261 * Call directly into transport_generic_new_cmd() to perform
1262 * the backend memory allocation.
1264 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1265 if (cmd->sense_reason)
1270 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1273 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1276 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1278 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1281 goto after_immediate_data;
1283 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1284 cmd->first_burst_len);
1285 after_immediate_data:
1286 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1288 * A PDU/CmdSN carrying Immediate Data passed
1289 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1290 * Immediate Bit is not set.
1292 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1293 (unsigned char *)hdr, hdr->cmdsn);
1294 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1297 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1300 rc = iscsit_dump_data_payload(cmd->conn,
1301 cmd->first_burst_len, 1);
1302 target_put_sess_cmd(&cmd->se_cmd);
1304 } else if (cmd->unsolicited_data)
1305 iscsit_set_unsoliticed_dataout(cmd);
1307 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1309 * Immediate Data failed DataCRC and ERL>=1,
1310 * silently drop this PDU and let the initiator
1311 * plug the CmdSN gap.
1313 * FIXME: Send Unsolicited NOPIN with reserved
1314 * TTT here to help the initiator figure out
1315 * the missing CmdSN, although they should be
1316 * intelligent enough to determine the missing
1317 * CmdSN and issue a retry to plug the sequence.
1319 cmd->i_state = ISTATE_REMOVE;
1320 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1321 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1328 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1331 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1333 bool dump_payload = false;
1335 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1339 * Allocation iovecs needed for struct socket operations for
1340 * traditional iSCSI block I/O.
1342 if (iscsit_allocate_iovecs(cmd) < 0) {
1343 return iscsit_reject_cmd(cmd,
1344 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1346 immed_data = cmd->immediate_data;
1348 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1352 dump_payload = true;
1357 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1360 static u32 iscsit_do_crypto_hash_sg(
1361 struct ahash_request *hash,
1362 struct iscsi_cmd *cmd,
1369 struct scatterlist *sg;
1370 unsigned int page_off;
1372 crypto_ahash_init(hash);
1374 sg = cmd->first_data_sg;
1375 page_off = cmd->first_data_sg_off;
1377 while (data_length) {
1378 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1380 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1381 crypto_ahash_update(hash);
1383 data_length -= cur_len;
1385 /* iscsit_map_iovec has already checked for invalid sg pointers */
1390 struct scatterlist pad_sg;
1392 sg_init_one(&pad_sg, pad_bytes, padding);
1393 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1395 crypto_ahash_finup(hash);
1397 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1398 crypto_ahash_final(hash);
1404 static void iscsit_do_crypto_hash_buf(
1405 struct ahash_request *hash,
1412 struct scatterlist sg[2];
1414 sg_init_table(sg, ARRAY_SIZE(sg));
1415 sg_set_buf(sg, buf, payload_length);
1416 sg_set_buf(sg + 1, pad_bytes, padding);
1418 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1420 crypto_ahash_digest(hash);
1424 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1425 struct iscsi_cmd *cmd, u32 payload_length,
1428 struct iscsi_data *hdr = buf;
1429 struct se_cmd *se_cmd;
1433 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1435 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1436 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1437 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1438 payload_length, conn->cid);
1440 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1441 pr_err("Command ITT: 0x%08x received DataOUT after"
1442 " last DataOUT received, dumping payload\n",
1443 cmd->init_task_tag);
1444 return iscsit_dump_data_payload(conn, payload_length, 1);
1447 if (cmd->data_direction != DMA_TO_DEVICE) {
1448 pr_err("Command ITT: 0x%08x received DataOUT for a"
1449 " NON-WRITE command.\n", cmd->init_task_tag);
1450 return iscsit_dump_data_payload(conn, payload_length, 1);
1452 se_cmd = &cmd->se_cmd;
1453 iscsit_mod_dataout_timer(cmd);
1455 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1456 pr_err("DataOut Offset: %u, Length %u greater than"
1457 " iSCSI Command EDTL %u, protocol error.\n",
1458 hdr->offset, payload_length, cmd->se_cmd.data_length);
1459 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1462 if (cmd->unsolicited_data) {
1463 int dump_unsolicited_data = 0;
1465 if (conn->sess->sess_ops->InitialR2T) {
1466 pr_err("Received unexpected unsolicited data"
1467 " while InitialR2T=Yes, protocol error.\n");
1468 transport_send_check_condition_and_sense(&cmd->se_cmd,
1469 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1473 * Special case for dealing with Unsolicited DataOUT
1474 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1478 /* Something's amiss if we're not in WRITE_PENDING state... */
1479 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1480 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1481 dump_unsolicited_data = 1;
1483 if (dump_unsolicited_data) {
1485 * Check if a delayed TASK_ABORTED status needs to
1486 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1487 * received with the unsolicited data out.
1489 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1490 iscsit_stop_dataout_timer(cmd);
1492 transport_check_aborted_status(se_cmd,
1493 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1494 return iscsit_dump_data_payload(conn, payload_length, 1);
1498 * For the normal solicited data path:
1500 * Check for a delayed TASK_ABORTED status and dump any
1501 * incoming data out payload if one exists. Also, when the
1502 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1503 * data out sequence, we decrement outstanding_r2ts. Once
1504 * outstanding_r2ts reaches zero, go ahead and send the delayed
1505 * TASK_ABORTED status.
1507 if (se_cmd->transport_state & CMD_T_ABORTED) {
1508 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1509 if (--cmd->outstanding_r2ts < 1) {
1510 iscsit_stop_dataout_timer(cmd);
1511 transport_check_aborted_status(
1515 return iscsit_dump_data_payload(conn, payload_length, 1);
1519 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1520 * within-command recovery checks before receiving the payload.
1522 rc = iscsit_check_pre_dataout(cmd, buf);
1523 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1525 else if (rc == DATAOUT_CANNOT_RECOVER)
1530 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1533 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1534 struct iscsi_cmd **out_cmd)
1536 struct iscsi_data *hdr = buf;
1537 struct iscsi_cmd *cmd;
1538 u32 payload_length = ntoh24(hdr->dlength);
1540 bool success = false;
1542 if (!payload_length) {
1543 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1547 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1548 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1549 " MaxXmitDataSegmentLength: %u\n", payload_length,
1550 conn->conn_ops->MaxXmitDataSegmentLength);
1551 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1554 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1558 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1565 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1568 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1569 struct iscsi_data *hdr)
1572 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1573 u32 payload_length = ntoh24(hdr->dlength);
1574 int iov_ret, data_crc_failed = 0;
1576 rx_size += payload_length;
1577 iov = &cmd->iov_data[0];
1579 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1584 iov_count += iov_ret;
1586 padding = ((-payload_length) & 3);
1588 iov[iov_count].iov_base = cmd->pad_bytes;
1589 iov[iov_count++].iov_len = padding;
1591 pr_debug("Receiving %u padding bytes.\n", padding);
1594 if (conn->conn_ops->DataDigest) {
1595 iov[iov_count].iov_base = &checksum;
1596 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1597 rx_size += ISCSI_CRC_LEN;
1600 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1602 iscsit_unmap_iovec(cmd);
1604 if (rx_got != rx_size)
1607 if (conn->conn_ops->DataDigest) {
1610 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1611 be32_to_cpu(hdr->offset),
1612 payload_length, padding,
1615 if (checksum != data_crc) {
1616 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1617 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1618 " does not match computed 0x%08x\n",
1619 hdr->itt, hdr->offset, payload_length,
1620 hdr->datasn, checksum, data_crc);
1621 data_crc_failed = 1;
1623 pr_debug("Got CRC32C DataDigest 0x%08x for"
1624 " %u bytes of Data Out\n", checksum,
1629 return data_crc_failed;
1633 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1634 bool data_crc_failed)
1636 struct iscsi_conn *conn = cmd->conn;
1639 * Increment post receive data and CRC values or perform
1640 * within-command recovery.
1642 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1643 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1645 else if (rc == DATAOUT_SEND_R2T) {
1646 iscsit_set_dataout_sequence_values(cmd);
1647 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1648 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1650 * Handle extra special case for out of order
1651 * Unsolicited Data Out.
1653 spin_lock_bh(&cmd->istate_lock);
1654 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1655 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1656 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1657 spin_unlock_bh(&cmd->istate_lock);
1659 iscsit_stop_dataout_timer(cmd);
1662 target_execute_cmd(&cmd->se_cmd);
1664 } else /* DATAOUT_CANNOT_RECOVER */
1669 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1671 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1673 struct iscsi_cmd *cmd = NULL;
1674 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1676 bool data_crc_failed = false;
1678 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1684 rc = iscsit_get_dataout(conn, cmd, hdr);
1688 data_crc_failed = true;
1690 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1693 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1694 struct iscsi_nopout *hdr)
1696 u32 payload_length = ntoh24(hdr->dlength);
1698 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1699 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1701 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1702 (unsigned char *)hdr);
1704 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1705 (unsigned char *)hdr);
1708 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1709 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1710 " not set, protocol error.\n");
1712 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1713 (unsigned char *)hdr);
1715 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1716 (unsigned char *)hdr);
1719 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1720 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1721 " greater than MaxXmitDataSegmentLength: %u, protocol"
1722 " error.\n", payload_length,
1723 conn->conn_ops->MaxXmitDataSegmentLength);
1725 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1726 (unsigned char *)hdr);
1728 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1729 (unsigned char *)hdr);
1732 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1733 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1734 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1735 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1738 * This is not a response to a Unsolicited NopIN, which means
1739 * it can either be a NOPOUT ping request (with a valid ITT),
1740 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1741 * Either way, make sure we allocate an struct iscsi_cmd, as both
1742 * can contain ping data.
1744 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1745 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1746 cmd->i_state = ISTATE_SEND_NOPIN;
1747 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1749 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1750 cmd->targ_xfer_tag = 0xFFFFFFFF;
1751 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1752 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1753 cmd->data_direction = DMA_NONE;
1758 EXPORT_SYMBOL(iscsit_setup_nop_out);
1760 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1761 struct iscsi_nopout *hdr)
1763 struct iscsi_cmd *cmd_p = NULL;
1766 * Initiator is expecting a NopIN ping reply..
1768 if (hdr->itt != RESERVED_ITT) {
1770 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1771 (unsigned char *)hdr);
1773 spin_lock_bh(&conn->cmd_lock);
1774 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1775 spin_unlock_bh(&conn->cmd_lock);
1777 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1779 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1780 iscsit_add_cmd_to_response_queue(cmd, conn,
1785 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1786 (unsigned char *)hdr, hdr->cmdsn);
1787 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1789 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1795 * This was a response to a unsolicited NOPIN ping.
1797 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1798 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1802 iscsit_stop_nopin_response_timer(conn);
1804 cmd_p->i_state = ISTATE_REMOVE;
1805 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1807 iscsit_start_nopin_timer(conn);
1811 * Otherwise, initiator is not expecting a NOPIN is response.
1812 * Just ignore for now.
1816 iscsit_free_cmd(cmd, false);
1820 EXPORT_SYMBOL(iscsit_process_nop_out);
1822 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1825 unsigned char *ping_data = NULL;
1826 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1827 struct kvec *iov = NULL;
1828 u32 payload_length = ntoh24(hdr->dlength);
1831 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1835 * Handle NOP-OUT payload for traditional iSCSI sockets
1837 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1838 u32 checksum, data_crc, padding = 0;
1839 int niov = 0, rx_got, rx_size = payload_length;
1841 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1847 iov = &cmd->iov_misc[0];
1848 iov[niov].iov_base = ping_data;
1849 iov[niov++].iov_len = payload_length;
1851 padding = ((-payload_length) & 3);
1853 pr_debug("Receiving %u additional bytes"
1854 " for padding.\n", padding);
1855 iov[niov].iov_base = &cmd->pad_bytes;
1856 iov[niov++].iov_len = padding;
1859 if (conn->conn_ops->DataDigest) {
1860 iov[niov].iov_base = &checksum;
1861 iov[niov++].iov_len = ISCSI_CRC_LEN;
1862 rx_size += ISCSI_CRC_LEN;
1865 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1866 if (rx_got != rx_size) {
1871 if (conn->conn_ops->DataDigest) {
1872 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1873 ping_data, payload_length,
1874 padding, cmd->pad_bytes,
1877 if (checksum != data_crc) {
1878 pr_err("Ping data CRC32C DataDigest"
1879 " 0x%08x does not match computed 0x%08x\n",
1880 checksum, data_crc);
1881 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1882 pr_err("Unable to recover from"
1883 " NOPOUT Ping DataCRC failure while in"
1889 * Silently drop this PDU and let the
1890 * initiator plug the CmdSN gap.
1892 pr_debug("Dropping NOPOUT"
1893 " Command CmdSN: 0x%08x due to"
1894 " DataCRC error.\n", hdr->cmdsn);
1899 pr_debug("Got CRC32C DataDigest"
1900 " 0x%08x for %u bytes of ping data.\n",
1901 checksum, payload_length);
1905 ping_data[payload_length] = '\0';
1907 * Attach ping data to struct iscsi_cmd->buf_ptr.
1909 cmd->buf_ptr = ping_data;
1910 cmd->buf_ptr_size = payload_length;
1912 pr_debug("Got %u bytes of NOPOUT ping"
1913 " data.\n", payload_length);
1914 pr_debug("Ping Data: \"%s\"\n", ping_data);
1917 return iscsit_process_nop_out(conn, cmd, hdr);
1920 iscsit_free_cmd(cmd, false);
1926 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1928 switch (iscsi_tmf) {
1929 case ISCSI_TM_FUNC_ABORT_TASK:
1930 return TMR_ABORT_TASK;
1931 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1932 return TMR_ABORT_TASK_SET;
1933 case ISCSI_TM_FUNC_CLEAR_ACA:
1934 return TMR_CLEAR_ACA;
1935 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1936 return TMR_CLEAR_TASK_SET;
1937 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1938 return TMR_LUN_RESET;
1939 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1940 return TMR_TARGET_WARM_RESET;
1941 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1942 return TMR_TARGET_COLD_RESET;
1949 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1952 struct se_tmr_req *se_tmr;
1953 struct iscsi_tmr_req *tmr_req;
1954 struct iscsi_tm *hdr;
1955 int out_of_order_cmdsn = 0, ret;
1956 bool sess_ref = false;
1957 u8 function, tcm_function = TMR_UNKNOWN;
1959 hdr = (struct iscsi_tm *) buf;
1960 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1961 function = hdr->flags;
1963 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1964 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1965 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1966 hdr->rtt, hdr->refcmdsn, conn->cid);
1968 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1969 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1970 hdr->rtt != RESERVED_ITT)) {
1971 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1972 hdr->rtt = RESERVED_ITT;
1975 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1976 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1977 pr_err("Task Management Request TASK_REASSIGN not"
1978 " issued as immediate command, bad iSCSI Initiator"
1979 "implementation\n");
1980 return iscsit_add_reject_cmd(cmd,
1981 ISCSI_REASON_PROTOCOL_ERROR, buf);
1983 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1984 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1985 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1987 cmd->data_direction = DMA_NONE;
1988 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1990 return iscsit_add_reject_cmd(cmd,
1991 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1995 * TASK_REASSIGN for ERL=2 / connection stays inside of
1996 * LIO-Target $FABRIC_MOD
1998 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1999 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2000 conn->sess->se_sess, 0, DMA_NONE,
2001 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2003 target_get_sess_cmd(&cmd->se_cmd, true);
2005 tcm_function = iscsit_convert_tmf(function);
2006 if (tcm_function == TMR_UNKNOWN) {
2007 pr_err("Unknown iSCSI TMR Function:"
2008 " 0x%02x\n", function);
2009 return iscsit_add_reject_cmd(cmd,
2010 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2013 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2016 return iscsit_add_reject_cmd(cmd,
2017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2019 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2021 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2022 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2023 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2024 cmd->init_task_tag = hdr->itt;
2025 cmd->targ_xfer_tag = 0xFFFFFFFF;
2026 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2027 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2028 se_tmr = cmd->se_cmd.se_tmr_req;
2029 tmr_req = cmd->tmr_req;
2031 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2033 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2034 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2035 scsilun_to_int(&hdr->lun));
2037 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2043 case ISCSI_TM_FUNC_ABORT_TASK:
2044 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2045 if (se_tmr->response)
2048 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2049 case ISCSI_TM_FUNC_CLEAR_ACA:
2050 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2051 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2053 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2054 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2055 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2059 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2060 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2061 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2065 case ISCSI_TM_FUNC_TASK_REASSIGN:
2066 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2068 * Perform sanity checks on the ExpDataSN only if the
2069 * TASK_REASSIGN was successful.
2071 if (se_tmr->response)
2074 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2075 return iscsit_add_reject_cmd(cmd,
2076 ISCSI_REASON_BOOKMARK_INVALID, buf);
2079 pr_err("Unknown TMR function: 0x%02x, protocol"
2080 " error.\n", function);
2081 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2085 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2086 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2087 se_tmr->call_transport = 1;
2089 spin_lock_bh(&conn->cmd_lock);
2090 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2091 spin_unlock_bh(&conn->cmd_lock);
2093 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2094 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2095 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2096 out_of_order_cmdsn = 1;
2097 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2099 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2102 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2104 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2107 * Found the referenced task, send to transport for processing.
2109 if (se_tmr->call_transport)
2110 return transport_generic_handle_tmr(&cmd->se_cmd);
2113 * Could not find the referenced LUN, task, or Task Management
2114 * command not authorized or supported. Change state and
2115 * let the tx_thread send the response.
2117 * For connection recovery, this is also the default action for
2118 * TMR TASK_REASSIGN.
2121 pr_debug("Handle TMR, using sess_ref=true check\n");
2122 target_put_sess_cmd(&cmd->se_cmd);
2125 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2133 struct iscsi_text *hdr)
2135 u32 payload_length = ntoh24(hdr->dlength);
2137 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2138 pr_err("Unable to accept text parameter length: %u"
2139 "greater than MaxXmitDataSegmentLength %u.\n",
2140 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2141 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2142 (unsigned char *)hdr);
2145 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2146 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2147 pr_err("Multi sequence text commands currently not supported\n");
2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2149 (unsigned char *)hdr);
2152 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2153 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2154 hdr->exp_statsn, payload_length);
2156 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2157 cmd->i_state = ISTATE_SEND_TEXTRSP;
2158 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2159 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2160 cmd->targ_xfer_tag = 0xFFFFFFFF;
2161 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2162 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2163 cmd->data_direction = DMA_NONE;
2164 cmd->text_in_ptr = NULL;
2168 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2171 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2172 struct iscsi_text *hdr)
2174 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2178 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2179 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2180 pr_err("Unable to locate text_in buffer for sendtargets"
2184 goto empty_sendtargets;
2186 if (strncmp("SendTargets", text_in, 11) != 0) {
2187 pr_err("Received Text Data that is not"
2188 " SendTargets, cannot continue.\n");
2191 text_ptr = strchr(text_in, '=');
2193 pr_err("No \"=\" separator found in Text Data,"
2194 " cannot continue.\n");
2197 if (!strncmp("=All", text_ptr, 4)) {
2198 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2199 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2200 !strncmp("=eui.", text_ptr, 5)) {
2201 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2203 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2207 spin_lock_bh(&conn->cmd_lock);
2208 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2209 spin_unlock_bh(&conn->cmd_lock);
2212 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2214 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2215 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2216 (unsigned char *)hdr, hdr->cmdsn);
2217 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2223 return iscsit_execute_cmd(cmd, 0);
2226 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2227 (unsigned char *)hdr);
2229 EXPORT_SYMBOL(iscsit_process_text_cmd);
2232 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2235 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2236 char *text_in = NULL;
2237 u32 payload_length = ntoh24(hdr->dlength);
2240 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2244 rx_size = payload_length;
2245 if (payload_length) {
2246 u32 checksum = 0, data_crc = 0;
2247 u32 padding = 0, pad_bytes = 0;
2248 int niov = 0, rx_got;
2251 text_in = kzalloc(payload_length, GFP_KERNEL);
2255 cmd->text_in_ptr = text_in;
2257 memset(iov, 0, 3 * sizeof(struct kvec));
2258 iov[niov].iov_base = text_in;
2259 iov[niov++].iov_len = payload_length;
2261 padding = ((-payload_length) & 3);
2263 iov[niov].iov_base = &pad_bytes;
2264 iov[niov++].iov_len = padding;
2266 pr_debug("Receiving %u additional bytes"
2267 " for padding.\n", padding);
2269 if (conn->conn_ops->DataDigest) {
2270 iov[niov].iov_base = &checksum;
2271 iov[niov++].iov_len = ISCSI_CRC_LEN;
2272 rx_size += ISCSI_CRC_LEN;
2275 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2276 if (rx_got != rx_size)
2279 if (conn->conn_ops->DataDigest) {
2280 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2281 text_in, payload_length,
2282 padding, (u8 *)&pad_bytes,
2285 if (checksum != data_crc) {
2286 pr_err("Text data CRC32C DataDigest"
2287 " 0x%08x does not match computed"
2288 " 0x%08x\n", checksum, data_crc);
2289 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2290 pr_err("Unable to recover from"
2291 " Text Data digest failure while in"
2296 * Silently drop this PDU and let the
2297 * initiator plug the CmdSN gap.
2299 pr_debug("Dropping Text"
2300 " Command CmdSN: 0x%08x due to"
2301 " DataCRC error.\n", hdr->cmdsn);
2306 pr_debug("Got CRC32C DataDigest"
2307 " 0x%08x for %u bytes of text data.\n",
2308 checksum, payload_length);
2311 text_in[payload_length - 1] = '\0';
2312 pr_debug("Successfully read %d bytes of text"
2313 " data.\n", payload_length);
2316 return iscsit_process_text_cmd(conn, cmd, hdr);
2319 kfree(cmd->text_in_ptr);
2320 cmd->text_in_ptr = NULL;
2321 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2324 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2326 struct iscsi_conn *conn_p;
2327 struct iscsi_session *sess = conn->sess;
2329 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2330 " for SID: %u.\n", conn->cid, conn->sess->sid);
2332 atomic_set(&sess->session_logout, 1);
2333 atomic_set(&conn->conn_logout_remove, 1);
2334 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2336 iscsit_inc_conn_usage_count(conn);
2337 iscsit_inc_session_usage_count(sess);
2339 spin_lock_bh(&sess->conn_lock);
2340 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2341 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2344 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2345 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2347 spin_unlock_bh(&sess->conn_lock);
2349 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2354 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2356 struct iscsi_conn *l_conn;
2357 struct iscsi_session *sess = conn->sess;
2359 pr_debug("Received logout request CLOSECONNECTION for CID:"
2360 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2363 * A Logout Request with a CLOSECONNECTION reason code for a CID
2364 * can arrive on a connection with a differing CID.
2366 if (conn->cid == cmd->logout_cid) {
2367 spin_lock_bh(&conn->state_lock);
2368 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2369 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2371 atomic_set(&conn->conn_logout_remove, 1);
2372 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2373 iscsit_inc_conn_usage_count(conn);
2375 spin_unlock_bh(&conn->state_lock);
2378 * Handle all different cid CLOSECONNECTION requests in
2379 * iscsit_logout_post_handler_diffcid() as to give enough
2380 * time for any non immediate command's CmdSN to be
2381 * acknowledged on the connection in question.
2383 * Here we simply make sure the CID is still around.
2385 l_conn = iscsit_get_conn_from_cid(sess,
2388 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2389 iscsit_add_cmd_to_response_queue(cmd, conn,
2394 iscsit_dec_conn_usage_count(l_conn);
2397 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2402 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2404 struct iscsi_session *sess = conn->sess;
2406 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2407 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2409 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2410 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411 " while ERL!=2.\n");
2412 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2413 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2417 if (conn->cid == cmd->logout_cid) {
2418 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419 " with CID: %hu on CID: %hu, implementation error.\n",
2420 cmd->logout_cid, conn->cid);
2421 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2422 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2426 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2432 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2435 int cmdsn_ret, logout_remove = 0;
2437 struct iscsi_logout *hdr;
2438 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2440 hdr = (struct iscsi_logout *) buf;
2441 reason_code = (hdr->flags & 0x7f);
2444 spin_lock(&tiqn->logout_stats.lock);
2445 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2446 tiqn->logout_stats.normal_logouts++;
2448 tiqn->logout_stats.abnormal_logouts++;
2449 spin_unlock(&tiqn->logout_stats.lock);
2452 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2453 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2454 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2455 hdr->cid, conn->cid);
2457 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2458 pr_err("Received logout request on connection that"
2459 " is not in logged in state, ignoring request.\n");
2460 iscsit_free_cmd(cmd, false);
2464 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2465 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2466 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2467 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2468 cmd->targ_xfer_tag = 0xFFFFFFFF;
2469 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2470 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2471 cmd->logout_cid = be16_to_cpu(hdr->cid);
2472 cmd->logout_reason = reason_code;
2473 cmd->data_direction = DMA_NONE;
2476 * We need to sleep in these cases (by returning 1) until the Logout
2477 * Response gets sent in the tx thread.
2479 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2480 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2481 be16_to_cpu(hdr->cid) == conn->cid))
2484 spin_lock_bh(&conn->cmd_lock);
2485 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2486 spin_unlock_bh(&conn->cmd_lock);
2488 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2489 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2492 * Immediate commands are executed, well, immediately.
2493 * Non-Immediate Logout Commands are executed in CmdSN order.
2495 if (cmd->immediate_cmd) {
2496 int ret = iscsit_execute_cmd(cmd, 0);
2501 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2502 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2504 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2508 return logout_remove;
2510 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2512 int iscsit_handle_snack(
2513 struct iscsi_conn *conn,
2516 struct iscsi_snack *hdr;
2518 hdr = (struct iscsi_snack *) buf;
2519 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2521 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2522 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2523 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2524 hdr->begrun, hdr->runlength, conn->cid);
2526 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2527 pr_err("Initiator sent SNACK request while in"
2528 " ErrorRecoveryLevel=0.\n");
2529 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2533 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2534 * call from inside iscsi_send_recovery_datain_or_r2t().
2536 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2538 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2540 be32_to_cpu(hdr->ttt),
2541 be32_to_cpu(hdr->begrun),
2542 be32_to_cpu(hdr->runlength));
2543 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2544 return iscsit_handle_status_snack(conn, hdr->itt,
2545 be32_to_cpu(hdr->ttt),
2546 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2547 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2548 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2549 be32_to_cpu(hdr->begrun),
2550 be32_to_cpu(hdr->runlength));
2551 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2552 /* FIXME: Support R-Data SNACK */
2553 pr_err("R-Data SNACK Not Supported.\n");
2554 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2557 pr_err("Unknown SNACK type 0x%02x, protocol"
2558 " error.\n", hdr->flags & 0x0f);
2559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2565 EXPORT_SYMBOL(iscsit_handle_snack);
2567 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2569 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2570 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2571 wait_for_completion_interruptible_timeout(
2572 &conn->rx_half_close_comp,
2573 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2577 static int iscsit_handle_immediate_data(
2578 struct iscsi_cmd *cmd,
2579 struct iscsi_scsi_req *hdr,
2582 int iov_ret, rx_got = 0, rx_size = 0;
2583 u32 checksum, iov_count = 0, padding = 0;
2584 struct iscsi_conn *conn = cmd->conn;
2587 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2589 return IMMEDIATE_DATA_CANNOT_RECOVER;
2592 iov_count = iov_ret;
2593 iov = &cmd->iov_data[0];
2595 padding = ((-length) & 3);
2597 iov[iov_count].iov_base = cmd->pad_bytes;
2598 iov[iov_count++].iov_len = padding;
2602 if (conn->conn_ops->DataDigest) {
2603 iov[iov_count].iov_base = &checksum;
2604 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2605 rx_size += ISCSI_CRC_LEN;
2608 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2610 iscsit_unmap_iovec(cmd);
2612 if (rx_got != rx_size) {
2613 iscsit_rx_thread_wait_for_tcp(conn);
2614 return IMMEDIATE_DATA_CANNOT_RECOVER;
2617 if (conn->conn_ops->DataDigest) {
2620 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2621 cmd->write_data_done, length, padding,
2624 if (checksum != data_crc) {
2625 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2626 " does not match computed 0x%08x\n", checksum,
2629 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2630 pr_err("Unable to recover from"
2631 " Immediate Data digest failure while"
2633 iscsit_reject_cmd(cmd,
2634 ISCSI_REASON_DATA_DIGEST_ERROR,
2635 (unsigned char *)hdr);
2636 return IMMEDIATE_DATA_CANNOT_RECOVER;
2638 iscsit_reject_cmd(cmd,
2639 ISCSI_REASON_DATA_DIGEST_ERROR,
2640 (unsigned char *)hdr);
2641 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2644 pr_debug("Got CRC32C DataDigest 0x%08x for"
2645 " %u bytes of Immediate Data\n", checksum,
2650 cmd->write_data_done += length;
2652 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2653 spin_lock_bh(&cmd->istate_lock);
2654 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2655 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2656 spin_unlock_bh(&cmd->istate_lock);
2659 return IMMEDIATE_DATA_NORMAL_OPERATION;
2663 * Called with sess->conn_lock held.
2665 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2666 with active network interface */
2667 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2669 struct iscsi_cmd *cmd;
2670 struct iscsi_conn *conn_p;
2674 * Only send a Asynchronous Message on connections whos network
2675 * interface is still functional.
2677 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2678 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2679 iscsit_inc_conn_usage_count(conn_p);
2688 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2690 iscsit_dec_conn_usage_count(conn_p);
2694 cmd->logout_cid = conn->cid;
2695 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2696 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2698 spin_lock_bh(&conn_p->cmd_lock);
2699 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2700 spin_unlock_bh(&conn_p->cmd_lock);
2702 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2703 iscsit_dec_conn_usage_count(conn_p);
2706 static int iscsit_send_conn_drop_async_message(
2707 struct iscsi_cmd *cmd,
2708 struct iscsi_conn *conn)
2710 struct iscsi_async *hdr;
2712 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2714 hdr = (struct iscsi_async *) cmd->pdu;
2715 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2716 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2717 cmd->init_task_tag = RESERVED_ITT;
2718 cmd->targ_xfer_tag = 0xFFFFFFFF;
2719 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2720 cmd->stat_sn = conn->stat_sn++;
2721 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2722 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2723 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2724 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2725 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2726 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2727 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2729 pr_debug("Sending Connection Dropped Async Message StatSN:"
2730 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2731 cmd->logout_cid, conn->cid);
2733 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2736 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2738 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2739 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2740 wait_for_completion_interruptible_timeout(
2741 &conn->tx_half_close_comp,
2742 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2747 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2748 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2751 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2752 hdr->flags = datain->flags;
2753 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2754 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2755 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2756 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2757 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2758 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2759 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2762 hton24(hdr->dlength, datain->length);
2763 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2764 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2765 (struct scsi_lun *)&hdr->lun);
2767 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2769 hdr->itt = cmd->init_task_tag;
2771 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2772 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2774 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2776 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2778 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2780 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2781 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2782 hdr->datasn = cpu_to_be32(datain->data_sn);
2783 hdr->offset = cpu_to_be32(datain->offset);
2785 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2786 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2787 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2788 ntohl(hdr->offset), datain->length, conn->cid);
2790 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2792 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2794 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2795 struct iscsi_datain datain;
2796 struct iscsi_datain_req *dr;
2798 bool set_statsn = false;
2800 memset(&datain, 0, sizeof(struct iscsi_datain));
2801 dr = iscsit_get_datain_values(cmd, &datain);
2803 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2804 cmd->init_task_tag);
2808 * Be paranoid and double check the logic for now.
2810 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2811 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2812 " datain.length: %u exceeds cmd->data_length: %u\n",
2813 cmd->init_task_tag, datain.offset, datain.length,
2814 cmd->se_cmd.data_length);
2818 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2820 * Special case for successfully execution w/ both DATAIN
2823 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2824 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2825 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2827 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2828 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2829 iscsit_increment_maxcmdsn(cmd, conn->sess);
2830 cmd->stat_sn = conn->stat_sn++;
2832 } else if (dr->dr_complete ==
2833 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2837 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2839 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2843 if (dr->dr_complete) {
2844 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2846 iscsit_free_datain_req(cmd, dr);
2853 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2854 struct iscsi_logout_rsp *hdr)
2856 struct iscsi_conn *logout_conn = NULL;
2857 struct iscsi_conn_recovery *cr = NULL;
2858 struct iscsi_session *sess = conn->sess;
2860 * The actual shutting down of Sessions and/or Connections
2861 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2862 * is done in scsi_logout_post_handler().
2864 switch (cmd->logout_reason) {
2865 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2866 pr_debug("iSCSI session logout successful, setting"
2867 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2868 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2870 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2871 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2874 * For CLOSECONNECTION logout requests carrying
2875 * a matching logout CID -> local CID, the reference
2876 * for the local CID will have been incremented in
2877 * iscsi_logout_closeconnection().
2879 * For CLOSECONNECTION logout requests carrying
2880 * a different CID than the connection it arrived
2881 * on, the connection responding to cmd->logout_cid
2882 * is stopped in iscsit_logout_post_handler_diffcid().
2885 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2886 " successful.\n", cmd->logout_cid, conn->cid);
2887 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2889 case ISCSI_LOGOUT_REASON_RECOVERY:
2890 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2891 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2894 * If the connection is still active from our point of view
2895 * force connection recovery to occur.
2897 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2900 iscsit_connection_reinstatement_rcfr(logout_conn);
2901 iscsit_dec_conn_usage_count(logout_conn);
2904 cr = iscsit_get_inactive_connection_recovery_entry(
2905 conn->sess, cmd->logout_cid);
2907 pr_err("Unable to locate CID: %hu for"
2908 " REMOVECONNFORRECOVERY Logout Request.\n",
2910 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2914 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2916 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2917 " for recovery for CID: %hu on CID: %hu successful.\n",
2918 cmd->logout_cid, conn->cid);
2919 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2922 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2923 cmd->logout_reason);
2927 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2928 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2929 hdr->response = cmd->logout_response;
2930 hdr->itt = cmd->init_task_tag;
2931 cmd->stat_sn = conn->stat_sn++;
2932 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2934 iscsit_increment_maxcmdsn(cmd, conn->sess);
2935 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2936 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2938 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2939 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2940 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2941 cmd->logout_cid, conn->cid);
2945 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2948 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2952 rc = iscsit_build_logout_rsp(cmd, conn,
2953 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2957 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2961 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2962 struct iscsi_nopin *hdr, bool nopout_response)
2964 hdr->opcode = ISCSI_OP_NOOP_IN;
2965 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2966 hton24(hdr->dlength, cmd->buf_ptr_size);
2967 if (nopout_response)
2968 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2969 hdr->itt = cmd->init_task_tag;
2970 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2971 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2973 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2975 if (nopout_response)
2976 iscsit_increment_maxcmdsn(cmd, conn->sess);
2978 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2979 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2981 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2982 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2983 "Solicited" : "Unsolicited", cmd->init_task_tag,
2984 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2986 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2989 * Unsolicited NOPIN, either requesting a response or not.
2991 static int iscsit_send_unsolicited_nopin(
2992 struct iscsi_cmd *cmd,
2993 struct iscsi_conn *conn,
2996 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2999 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3001 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3002 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3004 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3008 spin_lock_bh(&cmd->istate_lock);
3009 cmd->i_state = want_response ?
3010 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3011 spin_unlock_bh(&cmd->istate_lock);
3017 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3019 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3021 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3024 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3025 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3027 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3029 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3034 static int iscsit_send_r2t(
3035 struct iscsi_cmd *cmd,
3036 struct iscsi_conn *conn)
3038 struct iscsi_r2t *r2t;
3039 struct iscsi_r2t_rsp *hdr;
3042 r2t = iscsit_get_r2t_from_list(cmd);
3046 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3047 memset(hdr, 0, ISCSI_HDR_LEN);
3048 hdr->opcode = ISCSI_OP_R2T;
3049 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3050 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3051 (struct scsi_lun *)&hdr->lun);
3052 hdr->itt = cmd->init_task_tag;
3053 if (conn->conn_transport->iscsit_get_r2t_ttt)
3054 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3056 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3057 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3058 hdr->statsn = cpu_to_be32(conn->stat_sn);
3059 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3060 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3061 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3062 hdr->data_offset = cpu_to_be32(r2t->offset);
3063 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3065 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3066 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3067 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3068 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3069 r2t->offset, r2t->xfer_len, conn->cid);
3071 spin_lock_bh(&cmd->r2t_lock);
3073 spin_unlock_bh(&cmd->r2t_lock);
3075 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3080 spin_lock_bh(&cmd->dataout_timeout_lock);
3081 iscsit_start_dataout_timer(cmd, conn);
3082 spin_unlock_bh(&cmd->dataout_timeout_lock);
3088 * @recovery: If called from iscsi_task_reassign_complete_write() for
3089 * connection recovery.
3091 int iscsit_build_r2ts_for_cmd(
3092 struct iscsi_conn *conn,
3093 struct iscsi_cmd *cmd,
3097 u32 offset = 0, xfer_len = 0;
3099 spin_lock_bh(&cmd->r2t_lock);
3100 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3101 spin_unlock_bh(&cmd->r2t_lock);
3105 if (conn->sess->sess_ops->DataSequenceInOrder &&
3107 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3109 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3110 if (conn->sess->sess_ops->DataSequenceInOrder) {
3111 offset = cmd->r2t_offset;
3113 if (first_r2t && recovery) {
3114 int new_data_end = offset +
3115 conn->sess->sess_ops->MaxBurstLength -
3116 cmd->next_burst_len;
3118 if (new_data_end > cmd->se_cmd.data_length)
3119 xfer_len = cmd->se_cmd.data_length - offset;
3122 conn->sess->sess_ops->MaxBurstLength -
3123 cmd->next_burst_len;
3125 int new_data_end = offset +
3126 conn->sess->sess_ops->MaxBurstLength;
3128 if (new_data_end > cmd->se_cmd.data_length)
3129 xfer_len = cmd->se_cmd.data_length - offset;
3131 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3133 cmd->r2t_offset += xfer_len;
3135 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3136 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3138 struct iscsi_seq *seq;
3140 seq = iscsit_get_seq_holder_for_r2t(cmd);
3142 spin_unlock_bh(&cmd->r2t_lock);
3146 offset = seq->offset;
3147 xfer_len = seq->xfer_len;
3149 if (cmd->seq_send_order == cmd->seq_count)
3150 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3152 cmd->outstanding_r2ts++;
3155 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3156 spin_unlock_bh(&cmd->r2t_lock);
3160 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3163 spin_unlock_bh(&cmd->r2t_lock);
3167 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3169 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3170 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3173 cmd->stat_sn = conn->stat_sn++;
3175 atomic_long_inc(&conn->sess->rsp_pdus);
3177 memset(hdr, 0, ISCSI_HDR_LEN);
3178 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3179 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3180 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3181 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3182 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3183 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3184 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3185 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3187 hdr->response = cmd->iscsi_response;
3188 hdr->cmd_status = cmd->se_cmd.scsi_status;
3189 hdr->itt = cmd->init_task_tag;
3190 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3192 iscsit_increment_maxcmdsn(cmd, conn->sess);
3193 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3194 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3196 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3197 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3198 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3199 cmd->se_cmd.scsi_status, conn->cid);
3201 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3203 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3205 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3206 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3207 void *data_buf = NULL;
3208 u32 padding = 0, data_buf_len = 0;
3210 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3213 * Attach SENSE DATA payload to iSCSI Response PDU
3215 if (cmd->se_cmd.sense_buffer &&
3216 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3217 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3218 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3219 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3221 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3222 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3223 data_buf = cmd->sense_buffer;
3224 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3227 memset(cmd->sense_buffer +
3228 cmd->se_cmd.scsi_sense_length, 0, padding);
3229 pr_debug("Adding %u bytes of padding to"
3230 " SENSE.\n", padding);
3233 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3235 cmd->se_cmd.scsi_sense_length);
3238 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3242 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3244 switch (se_tmr->response) {
3245 case TMR_FUNCTION_COMPLETE:
3246 return ISCSI_TMF_RSP_COMPLETE;
3247 case TMR_TASK_DOES_NOT_EXIST:
3248 return ISCSI_TMF_RSP_NO_TASK;
3249 case TMR_LUN_DOES_NOT_EXIST:
3250 return ISCSI_TMF_RSP_NO_LUN;
3251 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3252 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3253 case TMR_FUNCTION_REJECTED:
3255 return ISCSI_TMF_RSP_REJECTED;
3260 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3261 struct iscsi_tm_rsp *hdr)
3263 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3265 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3266 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3267 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3268 hdr->itt = cmd->init_task_tag;
3269 cmd->stat_sn = conn->stat_sn++;
3270 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3272 iscsit_increment_maxcmdsn(cmd, conn->sess);
3273 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3274 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3276 pr_debug("Built Task Management Response ITT: 0x%08x,"
3277 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3278 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3280 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3283 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3285 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3287 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3289 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3292 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3296 if (np->np_sockaddr.ss_family == AF_INET6) {
3297 const struct sockaddr_in6 sin6 = {
3298 .sin6_addr = IN6ADDR_ANY_INIT };
3299 struct sockaddr_in6 *sock_in6 =
3300 (struct sockaddr_in6 *)&np->np_sockaddr;
3302 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3303 sin6.sin6_addr.s6_addr, 16))
3306 struct sockaddr_in * sock_in =
3307 (struct sockaddr_in *)&np->np_sockaddr;
3309 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3316 #define SENDTARGETS_BUF_LIMIT 32768U
3319 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3320 enum iscsit_transport_type network_transport,
3321 int skip_bytes, bool *completed)
3323 char *payload = NULL;
3324 struct iscsi_conn *conn = cmd->conn;
3325 struct iscsi_portal_group *tpg;
3326 struct iscsi_tiqn *tiqn;
3327 struct iscsi_tpg_np *tpg_np;
3328 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3329 int target_name_printed;
3330 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3331 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3334 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3335 SENDTARGETS_BUF_LIMIT);
3337 payload = kzalloc(buffer_len, GFP_KERNEL);
3342 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3345 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3346 text_ptr = strchr(text_in, '=');
3348 pr_err("Unable to locate '=' string in text_in:"
3354 * Skip over '=' character..
3359 spin_lock(&tiqn_lock);
3360 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3361 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3362 strcmp(tiqn->tiqn, text_ptr)) {
3366 target_name_printed = 0;
3368 spin_lock(&tiqn->tiqn_tpg_lock);
3369 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3371 /* If demo_mode_discovery=0 and generate_node_acls=0
3372 * (demo mode dislabed) do not return
3373 * TargetName+TargetAddress unless a NodeACL exists.
3376 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3377 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3378 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3379 cmd->conn->sess->sess_ops->InitiatorName))) {
3383 spin_lock(&tpg->tpg_state_lock);
3384 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3385 spin_unlock(&tpg->tpg_state_lock);
3387 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3390 spin_lock(&tpg->tpg_np_lock);
3391 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3393 struct iscsi_np *np = tpg_np->tpg_np;
3394 bool inaddr_any = iscsit_check_inaddr_any(np);
3395 struct sockaddr_storage *sockaddr;
3397 if (np->np_network_transport != network_transport)
3400 if (!target_name_printed) {
3401 len = sprintf(buf, "TargetName=%s",
3405 if ((len + payload_len) > buffer_len) {
3406 spin_unlock(&tpg->tpg_np_lock);
3407 spin_unlock(&tiqn->tiqn_tpg_lock);
3412 if (skip_bytes && len <= skip_bytes) {
3415 memcpy(payload + payload_len, buf, len);
3417 target_name_printed = 1;
3418 if (len > skip_bytes)
3424 sockaddr = &conn->local_sockaddr;
3426 sockaddr = &np->np_sockaddr;
3428 len = sprintf(buf, "TargetAddress="
3434 if ((len + payload_len) > buffer_len) {
3435 spin_unlock(&tpg->tpg_np_lock);
3436 spin_unlock(&tiqn->tiqn_tpg_lock);
3441 if (skip_bytes && len <= skip_bytes) {
3444 memcpy(payload + payload_len, buf, len);
3446 if (len > skip_bytes)
3450 spin_unlock(&tpg->tpg_np_lock);
3452 spin_unlock(&tiqn->tiqn_tpg_lock);
3459 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3462 spin_unlock(&tiqn_lock);
3464 cmd->buf_ptr = payload;
3470 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3471 struct iscsi_text_rsp *hdr,
3472 enum iscsit_transport_type network_transport)
3474 int text_length, padding;
3475 bool completed = true;
3477 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3478 cmd->read_data_done,
3480 if (text_length < 0)
3484 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3486 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3487 cmd->read_data_done += text_length;
3488 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3489 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3491 hdr->opcode = ISCSI_OP_TEXT_RSP;
3492 padding = ((-text_length) & 3);
3493 hton24(hdr->dlength, text_length);
3494 hdr->itt = cmd->init_task_tag;
3495 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3496 cmd->stat_sn = conn->stat_sn++;
3497 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3499 iscsit_increment_maxcmdsn(cmd, conn->sess);
3501 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3502 * correctly increment MaxCmdSN for each response answering a
3503 * non immediate text request with a valid CmdSN.
3505 cmd->maxcmdsn_inc = 0;
3506 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3507 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3509 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3510 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3511 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3512 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3513 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3515 return text_length + padding;
3517 EXPORT_SYMBOL(iscsit_build_text_rsp);
3519 static int iscsit_send_text_rsp(
3520 struct iscsi_cmd *cmd,
3521 struct iscsi_conn *conn)
3523 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3526 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3527 conn->conn_transport->transport_type);
3528 if (text_length < 0)
3531 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3537 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3538 struct iscsi_reject *hdr)
3540 hdr->opcode = ISCSI_OP_REJECT;
3541 hdr->reason = cmd->reject_reason;
3542 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3543 hton24(hdr->dlength, ISCSI_HDR_LEN);
3544 hdr->ffffffff = cpu_to_be32(0xffffffff);
3545 cmd->stat_sn = conn->stat_sn++;
3546 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3547 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3548 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3551 EXPORT_SYMBOL(iscsit_build_reject);
3553 static int iscsit_send_reject(
3554 struct iscsi_cmd *cmd,
3555 struct iscsi_conn *conn)
3557 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3559 iscsit_build_reject(cmd, conn, hdr);
3561 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3562 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3564 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3569 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3573 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3574 * within iscsit_start_kthreads()
3576 * Here we use bitmap_id to determine which CPU that this
3577 * iSCSI connection's RX/TX threads will be scheduled to
3580 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3581 for_each_online_cpu(cpu) {
3583 cpumask_set_cpu(cpu, conn->conn_cpumask);
3588 * This should never be reached..
3591 cpumask_setall(conn->conn_cpumask);
3595 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3600 case ISTATE_SEND_R2T:
3601 ret = iscsit_send_r2t(cmd, conn);
3606 spin_lock_bh(&conn->cmd_lock);
3607 list_del_init(&cmd->i_conn_node);
3608 spin_unlock_bh(&conn->cmd_lock);
3610 iscsit_free_cmd(cmd, false);
3612 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3613 iscsit_mod_nopin_response_timer(conn);
3614 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3618 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3619 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3624 pr_err("Unknown Opcode: 0x%02x ITT:"
3625 " 0x%08x, i_state: %d on CID: %hu\n",
3626 cmd->iscsi_opcode, cmd->init_task_tag, state,
3636 EXPORT_SYMBOL(iscsit_immediate_queue);
3639 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3641 struct iscsit_transport *t = conn->conn_transport;
3642 struct iscsi_queue_req *qr;
3643 struct iscsi_cmd *cmd;
3647 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3648 atomic_set(&conn->check_immediate_queue, 0);
3651 kmem_cache_free(lio_qr_cache, qr);
3653 ret = t->iscsit_immediate_queue(conn, cmd, state);
3662 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3668 case ISTATE_SEND_DATAIN:
3669 ret = iscsit_send_datain(cmd, conn);
3674 goto check_rsp_state;
3675 else if (ret == 1) {
3677 spin_lock_bh(&cmd->istate_lock);
3678 cmd->i_state = ISTATE_SENT_STATUS;
3679 spin_unlock_bh(&cmd->istate_lock);
3681 if (atomic_read(&conn->check_immediate_queue))
3685 } else if (ret == 2) {
3686 /* Still must send status,
3687 SCF_TRANSPORT_TASK_SENSE was set */
3688 spin_lock_bh(&cmd->istate_lock);
3689 cmd->i_state = ISTATE_SEND_STATUS;
3690 spin_unlock_bh(&cmd->istate_lock);
3691 state = ISTATE_SEND_STATUS;
3692 goto check_rsp_state;
3696 case ISTATE_SEND_STATUS:
3697 case ISTATE_SEND_STATUS_RECOVERY:
3698 ret = iscsit_send_response(cmd, conn);
3700 case ISTATE_SEND_LOGOUTRSP:
3701 ret = iscsit_send_logout(cmd, conn);
3703 case ISTATE_SEND_ASYNCMSG:
3704 ret = iscsit_send_conn_drop_async_message(
3707 case ISTATE_SEND_NOPIN:
3708 ret = iscsit_send_nopin(cmd, conn);
3710 case ISTATE_SEND_REJECT:
3711 ret = iscsit_send_reject(cmd, conn);
3713 case ISTATE_SEND_TASKMGTRSP:
3714 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3717 ret = iscsit_tmr_post_handler(cmd, conn);
3719 iscsit_fall_back_to_erl0(conn->sess);
3721 case ISTATE_SEND_TEXTRSP:
3722 ret = iscsit_send_text_rsp(cmd, conn);
3725 pr_err("Unknown Opcode: 0x%02x ITT:"
3726 " 0x%08x, i_state: %d on CID: %hu\n",
3727 cmd->iscsi_opcode, cmd->init_task_tag,
3735 case ISTATE_SEND_LOGOUTRSP:
3736 if (!iscsit_logout_post_handler(cmd, conn))
3739 case ISTATE_SEND_STATUS:
3740 case ISTATE_SEND_ASYNCMSG:
3741 case ISTATE_SEND_NOPIN:
3742 case ISTATE_SEND_STATUS_RECOVERY:
3743 case ISTATE_SEND_TEXTRSP:
3744 case ISTATE_SEND_TASKMGTRSP:
3745 case ISTATE_SEND_REJECT:
3746 spin_lock_bh(&cmd->istate_lock);
3747 cmd->i_state = ISTATE_SENT_STATUS;
3748 spin_unlock_bh(&cmd->istate_lock);
3751 pr_err("Unknown Opcode: 0x%02x ITT:"
3752 " 0x%08x, i_state: %d on CID: %hu\n",
3753 cmd->iscsi_opcode, cmd->init_task_tag,
3754 cmd->i_state, conn->cid);
3758 if (atomic_read(&conn->check_immediate_queue))
3766 EXPORT_SYMBOL(iscsit_response_queue);
3768 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3770 struct iscsit_transport *t = conn->conn_transport;
3771 struct iscsi_queue_req *qr;
3772 struct iscsi_cmd *cmd;
3776 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3779 kmem_cache_free(lio_qr_cache, qr);
3781 ret = t->iscsit_response_queue(conn, cmd, state);
3782 if (ret == 1 || ret < 0)
3789 int iscsi_target_tx_thread(void *arg)
3792 struct iscsi_conn *conn = arg;
3794 * Allow ourselves to be interrupted by SIGINT so that a
3795 * connection recovery / failure event can be triggered externally.
3797 allow_signal(SIGINT);
3799 while (!kthread_should_stop()) {
3801 * Ensure that both TX and RX per connection kthreads
3802 * are scheduled to run on the same CPU.
3804 iscsit_thread_check_cpumask(conn, current, 1);
3806 wait_event_interruptible(conn->queues_wq,
3807 !iscsit_conn_all_queues_empty(conn));
3809 if (signal_pending(current))
3813 ret = iscsit_handle_immediate_queue(conn);
3817 ret = iscsit_handle_response_queue(conn);
3820 else if (ret == -ECONNRESET)
3828 * Avoid the normal connection failure code-path if this connection
3829 * is still within LOGIN mode, and iscsi_np process context is
3830 * responsible for cleaning up the early connection failure.
3832 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3833 iscsit_take_action_for_connection_exit(conn);
3838 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3840 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3841 struct iscsi_cmd *cmd;
3844 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3845 case ISCSI_OP_SCSI_CMD:
3846 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3850 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3852 case ISCSI_OP_SCSI_DATA_OUT:
3853 ret = iscsit_handle_data_out(conn, buf);
3855 case ISCSI_OP_NOOP_OUT:
3857 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3858 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862 ret = iscsit_handle_nop_out(conn, cmd, buf);
3864 case ISCSI_OP_SCSI_TMFUNC:
3865 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3869 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3872 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3873 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3877 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3882 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3884 case ISCSI_OP_LOGOUT:
3885 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3889 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3891 wait_for_completion_timeout(&conn->conn_logout_comp,
3892 SECONDS_FOR_LOGOUT_COMP * HZ);
3894 case ISCSI_OP_SNACK:
3895 ret = iscsit_handle_snack(conn, buf);
3898 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3899 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3900 pr_err("Cannot recover from unknown"
3901 " opcode while ERL=0, closing iSCSI connection.\n");
3904 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3905 " closing iSCSI connection.\n");
3912 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3915 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3919 spin_lock_bh(&conn->state_lock);
3920 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3921 spin_unlock_bh(&conn->state_lock);
3926 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3929 u8 buffer[ISCSI_HDR_LEN], opcode;
3930 u32 checksum = 0, digest = 0;
3933 while (!kthread_should_stop()) {
3935 * Ensure that both TX and RX per connection kthreads
3936 * are scheduled to run on the same CPU.
3938 iscsit_thread_check_cpumask(conn, current, 0);
3940 memset(buffer, 0, ISCSI_HDR_LEN);
3941 memset(&iov, 0, sizeof(struct kvec));
3943 iov.iov_base = buffer;
3944 iov.iov_len = ISCSI_HDR_LEN;
3946 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3947 if (ret != ISCSI_HDR_LEN) {
3948 iscsit_rx_thread_wait_for_tcp(conn);
3952 if (conn->conn_ops->HeaderDigest) {
3953 iov.iov_base = &digest;
3954 iov.iov_len = ISCSI_CRC_LEN;
3956 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3957 if (ret != ISCSI_CRC_LEN) {
3958 iscsit_rx_thread_wait_for_tcp(conn);
3962 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3963 buffer, ISCSI_HDR_LEN,
3964 0, NULL, (u8 *)&checksum);
3966 if (digest != checksum) {
3967 pr_err("HeaderDigest CRC32C failed,"
3968 " received 0x%08x, computed 0x%08x\n",
3971 * Set the PDU to 0xff so it will intentionally
3972 * hit default in the switch below.
3974 memset(buffer, 0xff, ISCSI_HDR_LEN);
3975 atomic_long_inc(&conn->sess->conn_digest_errors);
3977 pr_debug("Got HeaderDigest CRC32C"
3978 " 0x%08x\n", checksum);
3982 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3985 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3987 if (conn->sess->sess_ops->SessionType &&
3988 ((!(opcode & ISCSI_OP_TEXT)) ||
3989 (!(opcode & ISCSI_OP_LOGOUT)))) {
3990 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3991 " while in Discovery Session, rejecting.\n", opcode);
3992 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3997 ret = iscsi_target_rx_opcode(conn, buffer);
4003 int iscsi_target_rx_thread(void *arg)
4006 struct iscsi_conn *conn = arg;
4009 * Allow ourselves to be interrupted by SIGINT so that a
4010 * connection recovery / failure event can be triggered externally.
4012 allow_signal(SIGINT);
4014 * Wait for iscsi_post_login_handler() to complete before allowing
4015 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4017 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4018 if (rc < 0 || iscsi_target_check_conn_state(conn))
4021 if (!conn->conn_transport->iscsit_get_rx_pdu)
4024 conn->conn_transport->iscsit_get_rx_pdu(conn);
4026 if (!signal_pending(current))
4027 atomic_set(&conn->transport_failed, 1);
4028 iscsit_take_action_for_connection_exit(conn);
4032 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4034 LIST_HEAD(tmp_list);
4035 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4036 struct iscsi_session *sess = conn->sess;
4038 * We expect this function to only ever be called from either RX or TX
4039 * thread context via iscsit_close_connection() once the other context
4040 * has been reset -> returned sleeping pre-handler state.
4042 spin_lock_bh(&conn->cmd_lock);
4043 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4045 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4046 struct se_cmd *se_cmd = &cmd->se_cmd;
4048 if (se_cmd->se_tfo != NULL) {
4049 spin_lock(&se_cmd->t_state_lock);
4050 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4051 spin_unlock(&se_cmd->t_state_lock);
4054 spin_unlock_bh(&conn->cmd_lock);
4056 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4057 list_del_init(&cmd->i_conn_node);
4059 iscsit_increment_maxcmdsn(cmd, sess);
4060 iscsit_free_cmd(cmd, true);
4065 static void iscsit_stop_timers_for_cmds(
4066 struct iscsi_conn *conn)
4068 struct iscsi_cmd *cmd;
4070 spin_lock_bh(&conn->cmd_lock);
4071 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4072 if (cmd->data_direction == DMA_TO_DEVICE)
4073 iscsit_stop_dataout_timer(cmd);
4075 spin_unlock_bh(&conn->cmd_lock);
4078 int iscsit_close_connection(
4079 struct iscsi_conn *conn)
4081 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4082 struct iscsi_session *sess = conn->sess;
4084 pr_debug("Closing iSCSI connection CID %hu on SID:"
4085 " %u\n", conn->cid, sess->sid);
4087 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4088 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4089 * sleeping and the logout response never got sent because the
4090 * connection failed.
4092 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4093 * to signal logout response TX interrupt completion. Go ahead and skip
4094 * this for iser since isert_rx_opcode() does not wait on logout failure,
4095 * and to avoid iscsi_conn pointer dereference in iser-target code.
4097 if (!conn->conn_transport->rdma_shutdown)
4098 complete(&conn->conn_logout_comp);
4100 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4101 if (conn->tx_thread &&
4102 cmpxchg(&conn->tx_thread_active, true, false)) {
4103 send_sig(SIGINT, conn->tx_thread, 1);
4104 kthread_stop(conn->tx_thread);
4106 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4107 if (conn->rx_thread &&
4108 cmpxchg(&conn->rx_thread_active, true, false)) {
4109 send_sig(SIGINT, conn->rx_thread, 1);
4110 kthread_stop(conn->rx_thread);
4114 spin_lock(&iscsit_global->ts_bitmap_lock);
4115 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4117 spin_unlock(&iscsit_global->ts_bitmap_lock);
4119 iscsit_stop_timers_for_cmds(conn);
4120 iscsit_stop_nopin_response_timer(conn);
4121 iscsit_stop_nopin_timer(conn);
4123 if (conn->conn_transport->iscsit_wait_conn)
4124 conn->conn_transport->iscsit_wait_conn(conn);
4127 * During Connection recovery drop unacknowledged out of order
4128 * commands for this connection, and prepare the other commands
4131 * During normal operation clear the out of order commands (but
4132 * do not free the struct iscsi_ooo_cmdsn's) and release all
4133 * struct iscsi_cmds.
4135 if (atomic_read(&conn->connection_recovery)) {
4136 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4137 iscsit_prepare_cmds_for_reallegiance(conn);
4139 iscsit_clear_ooo_cmdsns_for_conn(conn);
4140 iscsit_release_commands_from_conn(conn);
4142 iscsit_free_queue_reqs_for_conn(conn);
4145 * Handle decrementing session or connection usage count if
4146 * a logout response was not able to be sent because the
4147 * connection failed. Fall back to Session Recovery here.
4149 if (atomic_read(&conn->conn_logout_remove)) {
4150 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4151 iscsit_dec_conn_usage_count(conn);
4152 iscsit_dec_session_usage_count(sess);
4154 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4155 iscsit_dec_conn_usage_count(conn);
4157 atomic_set(&conn->conn_logout_remove, 0);
4158 atomic_set(&sess->session_reinstatement, 0);
4159 atomic_set(&sess->session_fall_back_to_erl0, 1);
4162 spin_lock_bh(&sess->conn_lock);
4163 list_del(&conn->conn_list);
4166 * Attempt to let the Initiator know this connection failed by
4167 * sending an Connection Dropped Async Message on another
4168 * active connection.
4170 if (atomic_read(&conn->connection_recovery))
4171 iscsit_build_conn_drop_async_message(conn);
4173 spin_unlock_bh(&sess->conn_lock);
4176 * If connection reinstatement is being performed on this connection,
4177 * up the connection reinstatement semaphore that is being blocked on
4178 * in iscsit_cause_connection_reinstatement().
4180 spin_lock_bh(&conn->state_lock);
4181 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4182 spin_unlock_bh(&conn->state_lock);
4183 complete(&conn->conn_wait_comp);
4184 wait_for_completion(&conn->conn_post_wait_comp);
4185 spin_lock_bh(&conn->state_lock);
4189 * If connection reinstatement is being performed on this connection
4190 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4191 * connection wait rcfr semaphore that is being blocked on
4192 * an iscsit_connection_reinstatement_rcfr().
4194 if (atomic_read(&conn->connection_wait_rcfr)) {
4195 spin_unlock_bh(&conn->state_lock);
4196 complete(&conn->conn_wait_rcfr_comp);
4197 wait_for_completion(&conn->conn_post_wait_comp);
4198 spin_lock_bh(&conn->state_lock);
4200 atomic_set(&conn->connection_reinstatement, 1);
4201 spin_unlock_bh(&conn->state_lock);
4204 * If any other processes are accessing this connection pointer we
4205 * must wait until they have completed.
4207 iscsit_check_conn_usage_count(conn);
4209 ahash_request_free(conn->conn_tx_hash);
4210 if (conn->conn_rx_hash) {
4211 struct crypto_ahash *tfm;
4213 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4214 ahash_request_free(conn->conn_rx_hash);
4215 crypto_free_ahash(tfm);
4218 free_cpumask_var(conn->conn_cpumask);
4220 kfree(conn->conn_ops);
4221 conn->conn_ops = NULL;
4224 sock_release(conn->sock);
4226 if (conn->conn_transport->iscsit_free_conn)
4227 conn->conn_transport->iscsit_free_conn(conn);
4229 iscsit_put_transport(conn->conn_transport);
4231 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4232 conn->conn_state = TARG_CONN_STATE_FREE;
4235 spin_lock_bh(&sess->conn_lock);
4236 atomic_dec(&sess->nconn);
4237 pr_debug("Decremented iSCSI connection count to %hu from node:"
4238 " %s\n", atomic_read(&sess->nconn),
4239 sess->sess_ops->InitiatorName);
4241 * Make sure that if one connection fails in an non ERL=2 iSCSI
4242 * Session that they all fail.
4244 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4245 !atomic_read(&sess->session_logout))
4246 atomic_set(&sess->session_fall_back_to_erl0, 1);
4249 * If this was not the last connection in the session, and we are
4250 * performing session reinstatement or falling back to ERL=0, call
4251 * iscsit_stop_session() without sleeping to shutdown the other
4252 * active connections.
4254 if (atomic_read(&sess->nconn)) {
4255 if (!atomic_read(&sess->session_reinstatement) &&
4256 !atomic_read(&sess->session_fall_back_to_erl0)) {
4257 spin_unlock_bh(&sess->conn_lock);
4260 if (!atomic_read(&sess->session_stop_active)) {
4261 atomic_set(&sess->session_stop_active, 1);
4262 spin_unlock_bh(&sess->conn_lock);
4263 iscsit_stop_session(sess, 0, 0);
4266 spin_unlock_bh(&sess->conn_lock);
4271 * If this was the last connection in the session and one of the
4272 * following is occurring:
4274 * Session Reinstatement is not being performed, and are falling back
4275 * to ERL=0 call iscsit_close_session().
4277 * Session Logout was requested. iscsit_close_session() will be called
4280 * Session Continuation is not being performed, start the Time2Retain
4281 * handler and check if sleep_on_sess_wait_sem is active.
4283 if (!atomic_read(&sess->session_reinstatement) &&
4284 atomic_read(&sess->session_fall_back_to_erl0)) {
4285 spin_unlock_bh(&sess->conn_lock);
4286 iscsit_close_session(sess);
4289 } else if (atomic_read(&sess->session_logout)) {
4290 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4291 sess->session_state = TARG_SESS_STATE_FREE;
4292 spin_unlock_bh(&sess->conn_lock);
4294 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4295 complete(&sess->session_wait_comp);
4299 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4300 sess->session_state = TARG_SESS_STATE_FAILED;
4302 if (!atomic_read(&sess->session_continuation)) {
4303 spin_unlock_bh(&sess->conn_lock);
4304 iscsit_start_time2retain_handler(sess);
4306 spin_unlock_bh(&sess->conn_lock);
4308 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4309 complete(&sess->session_wait_comp);
4316 * If the iSCSI Session for the iSCSI Initiator Node exists,
4317 * forcefully shutdown the iSCSI NEXUS.
4319 int iscsit_close_session(struct iscsi_session *sess)
4321 struct iscsi_portal_group *tpg = sess->tpg;
4322 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4324 if (atomic_read(&sess->nconn)) {
4325 pr_err("%d connection(s) still exist for iSCSI session"
4326 " to %s\n", atomic_read(&sess->nconn),
4327 sess->sess_ops->InitiatorName);
4331 spin_lock_bh(&se_tpg->session_lock);
4332 atomic_set(&sess->session_logout, 1);
4333 atomic_set(&sess->session_reinstatement, 1);
4334 iscsit_stop_time2retain_timer(sess);
4335 spin_unlock_bh(&se_tpg->session_lock);
4338 * transport_deregister_session_configfs() will clear the
4339 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4340 * can be setting it again with __transport_register_session() in
4341 * iscsi_post_login_handler() again after the iscsit_stop_session()
4342 * completes in iscsi_np context.
4344 transport_deregister_session_configfs(sess->se_sess);
4347 * If any other processes are accessing this session pointer we must
4348 * wait until they have completed. If we are in an interrupt (the
4349 * time2retain handler) and contain and active session usage count we
4350 * restart the timer and exit.
4352 if (!in_interrupt()) {
4353 if (iscsit_check_session_usage_count(sess) == 1)
4354 iscsit_stop_session(sess, 1, 1);
4356 if (iscsit_check_session_usage_count(sess) == 2) {
4357 atomic_set(&sess->session_logout, 0);
4358 iscsit_start_time2retain_handler(sess);
4363 transport_deregister_session(sess->se_sess);
4365 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4366 iscsit_free_connection_recovery_entires(sess);
4368 iscsit_free_all_ooo_cmdsns(sess);
4370 spin_lock_bh(&se_tpg->session_lock);
4371 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4372 sess->session_state = TARG_SESS_STATE_FREE;
4373 pr_debug("Released iSCSI session from node: %s\n",
4374 sess->sess_ops->InitiatorName);
4377 tpg->tpg_tiqn->tiqn_nsessions--;
4379 pr_debug("Decremented number of active iSCSI Sessions on"
4380 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4382 spin_lock(&sess_idr_lock);
4383 idr_remove(&sess_idr, sess->session_index);
4384 spin_unlock(&sess_idr_lock);
4386 kfree(sess->sess_ops);
4387 sess->sess_ops = NULL;
4388 spin_unlock_bh(&se_tpg->session_lock);
4394 static void iscsit_logout_post_handler_closesession(
4395 struct iscsi_conn *conn)
4397 struct iscsi_session *sess = conn->sess;
4400 * Traditional iscsi/tcp will invoke this logic from TX thread
4401 * context during session logout, so clear tx_thread_active and
4402 * sleep if iscsit_close_connection() has not already occured.
4404 * Since iser-target invokes this logic from it's own workqueue,
4405 * always sleep waiting for RX/TX thread shutdown to complete
4406 * within iscsit_close_connection().
4408 if (!conn->conn_transport->rdma_shutdown)
4409 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4411 atomic_set(&conn->conn_logout_remove, 0);
4412 complete(&conn->conn_logout_comp);
4414 iscsit_dec_conn_usage_count(conn);
4415 iscsit_stop_session(sess, sleep, sleep);
4416 iscsit_dec_session_usage_count(sess);
4417 iscsit_close_session(sess);
4420 static void iscsit_logout_post_handler_samecid(
4421 struct iscsi_conn *conn)
4425 if (!conn->conn_transport->rdma_shutdown)
4426 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4428 atomic_set(&conn->conn_logout_remove, 0);
4429 complete(&conn->conn_logout_comp);
4431 iscsit_cause_connection_reinstatement(conn, sleep);
4432 iscsit_dec_conn_usage_count(conn);
4435 static void iscsit_logout_post_handler_diffcid(
4436 struct iscsi_conn *conn,
4439 struct iscsi_conn *l_conn;
4440 struct iscsi_session *sess = conn->sess;
4441 bool conn_found = false;
4446 spin_lock_bh(&sess->conn_lock);
4447 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4448 if (l_conn->cid == cid) {
4449 iscsit_inc_conn_usage_count(l_conn);
4454 spin_unlock_bh(&sess->conn_lock);
4460 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4462 spin_lock_bh(&l_conn->state_lock);
4463 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4464 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4465 spin_unlock_bh(&l_conn->state_lock);
4467 iscsit_cause_connection_reinstatement(l_conn, 1);
4468 iscsit_dec_conn_usage_count(l_conn);
4472 * Return of 0 causes the TX thread to restart.
4474 int iscsit_logout_post_handler(
4475 struct iscsi_cmd *cmd,
4476 struct iscsi_conn *conn)
4480 switch (cmd->logout_reason) {
4481 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4482 switch (cmd->logout_response) {
4483 case ISCSI_LOGOUT_SUCCESS:
4484 case ISCSI_LOGOUT_CLEANUP_FAILED:
4486 iscsit_logout_post_handler_closesession(conn);
4491 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4492 if (conn->cid == cmd->logout_cid) {
4493 switch (cmd->logout_response) {
4494 case ISCSI_LOGOUT_SUCCESS:
4495 case ISCSI_LOGOUT_CLEANUP_FAILED:
4497 iscsit_logout_post_handler_samecid(conn);
4502 switch (cmd->logout_response) {
4503 case ISCSI_LOGOUT_SUCCESS:
4504 iscsit_logout_post_handler_diffcid(conn,
4507 case ISCSI_LOGOUT_CID_NOT_FOUND:
4508 case ISCSI_LOGOUT_CLEANUP_FAILED:
4515 case ISCSI_LOGOUT_REASON_RECOVERY:
4516 switch (cmd->logout_response) {
4517 case ISCSI_LOGOUT_SUCCESS:
4518 case ISCSI_LOGOUT_CID_NOT_FOUND:
4519 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4520 case ISCSI_LOGOUT_CLEANUP_FAILED:
4532 EXPORT_SYMBOL(iscsit_logout_post_handler);
4534 void iscsit_fail_session(struct iscsi_session *sess)
4536 struct iscsi_conn *conn;
4538 spin_lock_bh(&sess->conn_lock);
4539 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4540 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4541 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4543 spin_unlock_bh(&sess->conn_lock);
4545 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4546 sess->session_state = TARG_SESS_STATE_FAILED;
4549 int iscsit_free_session(struct iscsi_session *sess)
4551 u16 conn_count = atomic_read(&sess->nconn);
4552 struct iscsi_conn *conn, *conn_tmp = NULL;
4555 spin_lock_bh(&sess->conn_lock);
4556 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4558 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4560 if (conn_count == 0)
4563 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4566 iscsit_inc_conn_usage_count(conn_tmp);
4569 iscsit_inc_conn_usage_count(conn);
4571 spin_unlock_bh(&sess->conn_lock);
4572 iscsit_cause_connection_reinstatement(conn, 1);
4573 spin_lock_bh(&sess->conn_lock);
4575 iscsit_dec_conn_usage_count(conn);
4577 iscsit_dec_conn_usage_count(conn_tmp);
4582 if (atomic_read(&sess->nconn)) {
4583 spin_unlock_bh(&sess->conn_lock);
4584 wait_for_completion(&sess->session_wait_comp);
4586 spin_unlock_bh(&sess->conn_lock);
4588 iscsit_close_session(sess);
4592 void iscsit_stop_session(
4593 struct iscsi_session *sess,
4595 int connection_sleep)
4597 u16 conn_count = atomic_read(&sess->nconn);
4598 struct iscsi_conn *conn, *conn_tmp = NULL;
4601 spin_lock_bh(&sess->conn_lock);
4603 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4605 if (connection_sleep) {
4606 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4608 if (conn_count == 0)
4611 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4614 iscsit_inc_conn_usage_count(conn_tmp);
4617 iscsit_inc_conn_usage_count(conn);
4619 spin_unlock_bh(&sess->conn_lock);
4620 iscsit_cause_connection_reinstatement(conn, 1);
4621 spin_lock_bh(&sess->conn_lock);
4623 iscsit_dec_conn_usage_count(conn);
4625 iscsit_dec_conn_usage_count(conn_tmp);
4629 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4630 iscsit_cause_connection_reinstatement(conn, 0);
4633 if (session_sleep && atomic_read(&sess->nconn)) {
4634 spin_unlock_bh(&sess->conn_lock);
4635 wait_for_completion(&sess->session_wait_comp);
4637 spin_unlock_bh(&sess->conn_lock);
4640 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4642 struct iscsi_session *sess;
4643 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4644 struct se_session *se_sess, *se_sess_tmp;
4645 LIST_HEAD(free_list);
4646 int session_count = 0;
4648 spin_lock_bh(&se_tpg->session_lock);
4649 if (tpg->nsessions && !force) {
4650 spin_unlock_bh(&se_tpg->session_lock);
4654 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4656 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4658 spin_lock(&sess->conn_lock);
4659 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4660 atomic_read(&sess->session_logout) ||
4661 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4662 spin_unlock(&sess->conn_lock);
4665 atomic_set(&sess->session_reinstatement, 1);
4666 atomic_set(&sess->session_fall_back_to_erl0, 1);
4667 spin_unlock(&sess->conn_lock);
4669 list_move_tail(&se_sess->sess_list, &free_list);
4671 spin_unlock_bh(&se_tpg->session_lock);
4673 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4674 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4676 iscsit_free_session(sess);
4680 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4681 " Group: %hu\n", session_count, tpg->tpgt);
4685 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4686 MODULE_VERSION("4.1.x");
4687 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4688 MODULE_LICENSE("GPL");
4690 module_init(iscsi_target_init_module);
4691 module_exit(iscsi_target_cleanup_module);