1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
51 #include <target/iscsi/iscsi_transport.h>
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
58 static struct idr tiqn_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_lock;
63 struct iscsit_global *iscsit_global;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75 struct iscsi_tiqn *tiqn = NULL;
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
88 spin_unlock(&tiqn->tiqn_state_lock);
91 spin_unlock(&tiqn_lock);
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
104 spin_unlock(&tiqn->tiqn_state_lock);
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122 struct iscsi_tiqn *tiqn = NULL;
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
128 return ERR_PTR(-EINVAL);
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
133 return ERR_PTR(-ENOMEM);
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160 spin_unlock(&tiqn_lock);
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172 * Wait for accesses to said struct iscsi_tiqn to end.
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
178 spin_lock(&tiqn->tiqn_state_lock);
180 spin_unlock(&tiqn->tiqn_state_lock);
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
196 iscsit_wait_for_tiqn(tiqn);
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
212 * Determine if the network portal is accepting storage traffic.
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
219 spin_unlock_bh(&np->np_thread_lock);
221 * Determine if the portal group is accepting storage traffic.
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
228 spin_unlock_bh(&tpg->tpg_state_lock);
231 * Here we serialize access across the TIQN+TPG Tuple.
233 ret = down_interruptible(&tpg->np_login_sem);
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
243 spin_unlock_bh(&tpg->tpg_state_lock);
248 void iscsit_login_kref_put(struct kref *kref)
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
253 complete(&tpg_np->tpg_np_comp);
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261 up(&tpg->np_login_sem);
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
267 iscsit_put_tiqn_for_login(tiqn);
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
275 int network_transport)
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->sin6_port);
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
312 * Called with mutex np_lock held
314 static struct iscsi_np *iscsit_get_np(
315 struct sockaddr_storage *sockaddr,
316 int network_transport)
321 list_for_each_entry(np, &g_np_list, np_list) {
322 spin_lock_bh(&np->np_thread_lock);
323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324 spin_unlock_bh(&np->np_thread_lock);
328 match = iscsit_check_np_match(sockaddr, np, network_transport);
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
336 spin_unlock_bh(&np->np_thread_lock);
339 spin_unlock_bh(&np->np_thread_lock);
345 struct iscsi_np *iscsit_add_np(
346 struct sockaddr_storage *sockaddr,
347 int network_transport)
352 mutex_lock(&np_lock);
355 * Locate the existing struct iscsi_np if already active..
357 np = iscsit_get_np(sockaddr, network_transport);
359 mutex_unlock(&np_lock);
363 np = kzalloc(sizeof(*np), GFP_KERNEL);
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
378 mutex_unlock(&np_lock);
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
387 mutex_unlock(&np_lock);
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
409 int iscsit_reset_np_thread(
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421 atomic_inc(&np->np_reset_count);
424 spin_unlock_bh(&np->np_thread_lock);
425 send_sig(SIGINT, np->np_thread, 1);
426 wait_for_completion(&np->np_restart_comp);
427 spin_lock_bh(&np->np_thread_lock);
429 spin_unlock_bh(&np->np_thread_lock);
431 if (tpg_np && shutdown) {
432 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
434 wait_for_completion(&tpg_np->tpg_np_comp);
440 static void iscsit_free_np(struct iscsi_np *np)
443 sock_release(np->np_socket);
446 int iscsit_del_np(struct iscsi_np *np)
448 spin_lock_bh(&np->np_thread_lock);
450 if (np->np_exports) {
452 spin_unlock_bh(&np->np_thread_lock);
455 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
456 spin_unlock_bh(&np->np_thread_lock);
460 * We need to send the signal to wakeup Linux/Net
461 * which may be sleeping in sock_accept()..
463 send_sig(SIGINT, np->np_thread, 1);
464 kthread_stop(np->np_thread);
465 np->np_thread = NULL;
468 np->np_transport->iscsit_free_np(np);
470 mutex_lock(&np_lock);
471 list_del(&np->np_list);
472 mutex_unlock(&np_lock);
474 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
475 &np->np_sockaddr, np->np_transport->name);
477 iscsit_put_transport(np->np_transport);
482 static void iscsit_get_rx_pdu(struct iscsi_conn *);
484 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
486 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
488 EXPORT_SYMBOL(iscsit_queue_rsp);
490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
492 spin_lock_bh(&conn->cmd_lock);
493 if (!list_empty(&cmd->i_conn_node) &&
494 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
495 list_del_init(&cmd->i_conn_node);
496 spin_unlock_bh(&conn->cmd_lock);
498 __iscsit_free_cmd(cmd, true);
500 EXPORT_SYMBOL(iscsit_aborted_task);
502 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
503 u32, u32, u8 *, u8 *);
504 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
507 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
508 const void *data_buf, u32 data_buf_len)
510 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
512 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
515 iov = &cmd->iov_misc[0];
516 iov[niov].iov_base = cmd->pdu;
517 iov[niov++].iov_len = ISCSI_HDR_LEN;
519 if (conn->conn_ops->HeaderDigest) {
520 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
522 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
523 ISCSI_HDR_LEN, 0, NULL,
524 (u8 *)header_digest);
526 iov[0].iov_len += ISCSI_CRC_LEN;
527 tx_size += ISCSI_CRC_LEN;
528 pr_debug("Attaching CRC32C HeaderDigest"
529 " to opcode 0x%x 0x%08x\n",
530 hdr->opcode, *header_digest);
534 u32 padding = ((-data_buf_len) & 3);
536 iov[niov].iov_base = (void *)data_buf;
537 iov[niov++].iov_len = data_buf_len;
538 tx_size += data_buf_len;
541 iov[niov].iov_base = &cmd->pad_bytes;
542 iov[niov++].iov_len = padding;
544 pr_debug("Attaching %u additional"
545 " padding bytes.\n", padding);
548 if (conn->conn_ops->DataDigest) {
549 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
550 data_buf, data_buf_len,
552 (u8 *)&cmd->pad_bytes,
553 (u8 *)&cmd->data_crc);
555 iov[niov].iov_base = &cmd->data_crc;
556 iov[niov++].iov_len = ISCSI_CRC_LEN;
557 tx_size += ISCSI_CRC_LEN;
558 pr_debug("Attached DataDigest for %u"
559 " bytes opcode 0x%x, CRC 0x%08x\n",
560 data_buf_len, hdr->opcode, cmd->data_crc);
564 cmd->iov_misc_count = niov;
565 cmd->tx_size = tx_size;
567 ret = iscsit_send_tx_data(cmd, conn, 1);
569 iscsit_tx_thread_wait_for_tcp(conn);
576 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
577 static void iscsit_unmap_iovec(struct iscsi_cmd *);
578 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
579 u32, u32, u32, u8 *);
581 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
582 const struct iscsi_datain *datain)
585 u32 iov_count = 0, tx_size = 0;
588 iov = &cmd->iov_data[0];
589 iov[iov_count].iov_base = cmd->pdu;
590 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
591 tx_size += ISCSI_HDR_LEN;
593 if (conn->conn_ops->HeaderDigest) {
594 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
596 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
597 ISCSI_HDR_LEN, 0, NULL,
598 (u8 *)header_digest);
600 iov[0].iov_len += ISCSI_CRC_LEN;
601 tx_size += ISCSI_CRC_LEN;
603 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
607 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
608 datain->offset, datain->length);
612 iov_count += iov_ret;
613 tx_size += datain->length;
615 cmd->padding = ((-datain->length) & 3);
617 iov[iov_count].iov_base = cmd->pad_bytes;
618 iov[iov_count++].iov_len = cmd->padding;
619 tx_size += cmd->padding;
621 pr_debug("Attaching %u padding bytes\n", cmd->padding);
624 if (conn->conn_ops->DataDigest) {
625 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
631 iov[iov_count].iov_base = &cmd->data_crc;
632 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
633 tx_size += ISCSI_CRC_LEN;
635 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
636 datain->length + cmd->padding, cmd->data_crc);
639 cmd->iov_data_count = iov_count;
640 cmd->tx_size = tx_size;
642 ret = iscsit_fe_sendpage_sg(cmd, conn);
644 iscsit_unmap_iovec(cmd);
647 iscsit_tx_thread_wait_for_tcp(conn);
654 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
655 struct iscsi_datain_req *dr, const void *buf,
659 return iscsit_xmit_datain_pdu(conn, cmd, buf);
661 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
664 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
666 return TARGET_PROT_NORMAL;
669 static struct iscsit_transport iscsi_target_transport = {
671 .transport_type = ISCSI_TCP,
672 .rdma_shutdown = false,
674 .iscsit_setup_np = iscsit_setup_np,
675 .iscsit_accept_np = iscsit_accept_np,
676 .iscsit_free_np = iscsit_free_np,
677 .iscsit_get_login_rx = iscsit_get_login_rx,
678 .iscsit_put_login_tx = iscsit_put_login_tx,
679 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
680 .iscsit_immediate_queue = iscsit_immediate_queue,
681 .iscsit_response_queue = iscsit_response_queue,
682 .iscsit_queue_data_in = iscsit_queue_rsp,
683 .iscsit_queue_status = iscsit_queue_rsp,
684 .iscsit_aborted_task = iscsit_aborted_task,
685 .iscsit_xmit_pdu = iscsit_xmit_pdu,
686 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
687 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
690 static int __init iscsi_target_init_module(void)
694 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
695 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
699 spin_lock_init(&iscsit_global->ts_bitmap_lock);
700 mutex_init(&auth_id_lock);
701 spin_lock_init(&sess_idr_lock);
705 ret = target_register_template(&iscsi_ops);
709 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
710 iscsit_global->ts_bitmap = vzalloc(size);
711 if (!iscsit_global->ts_bitmap)
714 lio_qr_cache = kmem_cache_create("lio_qr_cache",
715 sizeof(struct iscsi_queue_req),
716 __alignof__(struct iscsi_queue_req), 0, NULL);
718 pr_err("nable to kmem_cache_create() for"
723 lio_dr_cache = kmem_cache_create("lio_dr_cache",
724 sizeof(struct iscsi_datain_req),
725 __alignof__(struct iscsi_datain_req), 0, NULL);
727 pr_err("Unable to kmem_cache_create() for"
732 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
733 sizeof(struct iscsi_ooo_cmdsn),
734 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
735 if (!lio_ooo_cache) {
736 pr_err("Unable to kmem_cache_create() for"
741 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
742 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
744 if (!lio_r2t_cache) {
745 pr_err("Unable to kmem_cache_create() for"
750 iscsit_register_transport(&iscsi_target_transport);
752 if (iscsit_load_discovery_tpg() < 0)
757 iscsit_unregister_transport(&iscsi_target_transport);
758 kmem_cache_destroy(lio_r2t_cache);
760 kmem_cache_destroy(lio_ooo_cache);
762 kmem_cache_destroy(lio_dr_cache);
764 kmem_cache_destroy(lio_qr_cache);
766 vfree(iscsit_global->ts_bitmap);
768 /* XXX: this probably wants it to be it's own unwind step.. */
769 if (iscsit_global->discovery_tpg)
770 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
771 target_unregister_template(&iscsi_ops);
773 kfree(iscsit_global);
777 static void __exit iscsi_target_cleanup_module(void)
779 iscsit_release_discovery_tpg();
780 iscsit_unregister_transport(&iscsi_target_transport);
781 kmem_cache_destroy(lio_qr_cache);
782 kmem_cache_destroy(lio_dr_cache);
783 kmem_cache_destroy(lio_ooo_cache);
784 kmem_cache_destroy(lio_r2t_cache);
787 * Shutdown discovery sessions and disable discovery TPG
789 if (iscsit_global->discovery_tpg)
790 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
792 target_unregister_template(&iscsi_ops);
794 vfree(iscsit_global->ts_bitmap);
795 kfree(iscsit_global);
798 int iscsit_add_reject(
799 struct iscsi_conn *conn,
803 struct iscsi_cmd *cmd;
805 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
809 cmd->iscsi_opcode = ISCSI_OP_REJECT;
810 cmd->reject_reason = reason;
812 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
814 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
815 iscsit_free_cmd(cmd, false);
819 spin_lock_bh(&conn->cmd_lock);
820 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
821 spin_unlock_bh(&conn->cmd_lock);
823 cmd->i_state = ISTATE_SEND_REJECT;
824 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
828 EXPORT_SYMBOL(iscsit_add_reject);
830 static int iscsit_add_reject_from_cmd(
831 struct iscsi_cmd *cmd,
836 struct iscsi_conn *conn;
839 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
845 cmd->iscsi_opcode = ISCSI_OP_REJECT;
846 cmd->reject_reason = reason;
848 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
850 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
851 iscsit_free_cmd(cmd, false);
856 spin_lock_bh(&conn->cmd_lock);
857 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
858 spin_unlock_bh(&conn->cmd_lock);
861 cmd->i_state = ISTATE_SEND_REJECT;
862 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
864 * Perform the kref_put now if se_cmd has already been setup by
865 * scsit_setup_scsi_cmd()
867 if (cmd->se_cmd.se_tfo != NULL) {
868 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
869 target_put_sess_cmd(&cmd->se_cmd);
874 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
877 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
880 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
882 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
884 EXPORT_SYMBOL(iscsit_reject_cmd);
887 * Map some portion of the allocated scatterlist to an iovec, suitable for
888 * kernel sockets to copy data in/out.
890 static int iscsit_map_iovec(
891 struct iscsi_cmd *cmd,
897 struct scatterlist *sg;
898 unsigned int page_off;
901 * We know each entry in t_data_sg contains a page.
903 u32 ent = data_offset / PAGE_SIZE;
905 if (ent >= cmd->se_cmd.t_data_nents) {
906 pr_err("Initial page entry out-of-bounds\n");
910 sg = &cmd->se_cmd.t_data_sg[ent];
911 page_off = (data_offset % PAGE_SIZE);
913 cmd->first_data_sg = sg;
914 cmd->first_data_sg_off = page_off;
916 while (data_length) {
917 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
919 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
920 iov[i].iov_len = cur_len;
922 data_length -= cur_len;
928 cmd->kmapped_nents = i;
933 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
936 struct scatterlist *sg;
938 sg = cmd->first_data_sg;
940 for (i = 0; i < cmd->kmapped_nents; i++)
941 kunmap(sg_page(&sg[i]));
944 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
947 struct iscsi_cmd *cmd, *cmd_p;
949 conn->exp_statsn = exp_statsn;
951 if (conn->sess->sess_ops->RDMAExtensions)
954 spin_lock_bh(&conn->cmd_lock);
955 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
956 spin_lock(&cmd->istate_lock);
957 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
958 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
959 cmd->i_state = ISTATE_REMOVE;
960 spin_unlock(&cmd->istate_lock);
961 list_move_tail(&cmd->i_conn_node, &ack_list);
964 spin_unlock(&cmd->istate_lock);
966 spin_unlock_bh(&conn->cmd_lock);
968 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
969 list_del_init(&cmd->i_conn_node);
970 iscsit_free_cmd(cmd, false);
974 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
976 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
978 iov_count += ISCSI_IOV_DATA_BUFFER;
979 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
983 cmd->orig_iov_data_count = iov_count;
987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
990 int data_direction, payload_length;
991 struct iscsi_scsi_req *hdr;
995 atomic_long_inc(&conn->sess->cmd_pdus);
997 hdr = (struct iscsi_scsi_req *) buf;
998 payload_length = ntoh24(hdr->dlength);
1000 /* FIXME; Add checks for AdditionalHeaderSegment */
1002 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1003 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1004 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005 " not set. Bad iSCSI Initiator.\n");
1006 return iscsit_add_reject_cmd(cmd,
1007 ISCSI_REASON_BOOKMARK_INVALID, buf);
1010 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1011 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1013 * From RFC-3720 Section 10.3.1:
1015 * "Either or both of R and W MAY be 1 when either the
1016 * Expected Data Transfer Length and/or Bidirectional Read
1017 * Expected Data Transfer Length are 0"
1019 * For this case, go ahead and clear the unnecssary bits
1020 * to avoid any confusion with ->data_direction.
1022 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1023 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1025 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026 " set when Expected Data Transfer Length is 0 for"
1027 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1030 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1031 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1032 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033 " MUST be set if Expected Data Transfer Length is not 0."
1034 " Bad iSCSI Initiator\n");
1035 return iscsit_add_reject_cmd(cmd,
1036 ISCSI_REASON_BOOKMARK_INVALID, buf);
1039 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1041 pr_err("Bidirectional operations not supported!\n");
1042 return iscsit_add_reject_cmd(cmd,
1043 ISCSI_REASON_BOOKMARK_INVALID, buf);
1046 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1047 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048 " Scsi Command PDU.\n");
1049 return iscsit_add_reject_cmd(cmd,
1050 ISCSI_REASON_BOOKMARK_INVALID, buf);
1053 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1054 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055 " protocol error.\n", payload_length);
1056 return iscsit_add_reject_cmd(cmd,
1057 ISCSI_REASON_PROTOCOL_ERROR, buf);
1060 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1061 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1062 pr_err("Expected Data Transfer Length and Length of"
1063 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064 " bit is not set protocol error\n");
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_PROTOCOL_ERROR, buf);
1069 if (payload_length > be32_to_cpu(hdr->data_length)) {
1070 pr_err("DataSegmentLength: %u is greater than"
1071 " EDTL: %u, protocol error.\n", payload_length,
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1077 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1085 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " FirstBurstLength: %u, protocol error.\n",
1088 payload_length, conn->sess->sess_ops->FirstBurstLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_BOOKMARK_INVALID, buf);
1093 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1094 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097 cmd->data_direction = data_direction;
1098 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1100 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1102 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1103 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1104 sam_task_attr = TCM_SIMPLE_TAG;
1105 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1106 sam_task_attr = TCM_ORDERED_TAG;
1107 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1108 sam_task_attr = TCM_HEAD_TAG;
1109 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1110 sam_task_attr = TCM_ACA_TAG;
1112 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1114 sam_task_attr = TCM_SIMPLE_TAG;
1117 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1118 cmd->i_state = ISTATE_NEW_CMD;
1119 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1120 cmd->immediate_data = (payload_length) ? 1 : 0;
1121 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1122 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1123 if (cmd->unsolicited_data)
1124 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1126 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1127 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1128 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1130 cmd->targ_xfer_tag = 0xFFFFFFFF;
1131 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1132 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1133 cmd->first_burst_len = payload_length;
1135 if (!conn->sess->sess_ops->RDMAExtensions &&
1136 cmd->data_direction == DMA_FROM_DEVICE) {
1137 struct iscsi_datain_req *dr;
1139 dr = iscsit_allocate_datain_req();
1141 return iscsit_add_reject_cmd(cmd,
1142 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1144 iscsit_attach_datain_req(cmd, dr);
1148 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1150 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1151 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1152 cmd->data_direction, sam_task_attr,
1153 cmd->sense_buffer + 2);
1155 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1157 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160 target_get_sess_cmd(&cmd->se_cmd, true);
1162 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1163 scsilun_to_int(&hdr->lun));
1164 if (cmd->sense_reason)
1167 /* only used for printks or comparing with ->ref_task_tag */
1168 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1169 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1170 if (cmd->sense_reason) {
1171 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172 return iscsit_add_reject_cmd(cmd,
1173 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1179 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1185 spin_lock_bh(&conn->cmd_lock);
1186 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1187 spin_unlock_bh(&conn->cmd_lock);
1189 * Check if we need to delay processing because of ALUA
1190 * Active/NonOptimized primary access state..
1192 core_alua_check_nonop_delay(&cmd->se_cmd);
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1200 iscsit_set_dataout_sequence_values(cmd);
1202 spin_lock_bh(&cmd->dataout_timeout_lock);
1203 iscsit_start_dataout_timer(cmd, cmd->conn);
1204 spin_unlock_bh(&cmd->dataout_timeout_lock);
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1209 struct iscsi_scsi_req *hdr)
1213 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214 * the Immediate Bit is not set, and no Immediate
1217 * A PDU/CmdSN carrying Immediate Data can only
1218 * be processed after the DataCRC has passed.
1219 * If the DataCRC fails, the CmdSN MUST NOT
1220 * be acknowledged. (See below)
1222 if (!cmd->immediate_data) {
1223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1224 (unsigned char *)hdr, hdr->cmdsn);
1225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1227 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1228 target_put_sess_cmd(&cmd->se_cmd);
1233 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1236 * If no Immediate Data is attached, it's OK to return now.
1238 if (!cmd->immediate_data) {
1239 if (!cmd->sense_reason && cmd->unsolicited_data)
1240 iscsit_set_unsoliticed_dataout(cmd);
1241 if (!cmd->sense_reason)
1244 target_put_sess_cmd(&cmd->se_cmd);
1249 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250 * execution. These exceptions are processed in CmdSN order using
1251 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1253 if (cmd->sense_reason)
1256 * Call directly into transport_generic_new_cmd() to perform
1257 * the backend memory allocation.
1259 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1260 if (cmd->sense_reason)
1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1268 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1271 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1273 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1276 goto after_immediate_data;
1278 * Check for underflow case where both EDTL and immediate data payload
1279 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1280 * already been set in target_cmd_size_check() as se_cmd->data_length.
1282 * For this special case, fail the command and dump the immediate data
1285 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1286 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1287 goto after_immediate_data;
1290 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291 cmd->first_burst_len);
1292 after_immediate_data:
1293 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1295 * A PDU/CmdSN carrying Immediate Data passed
1296 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297 * Immediate Bit is not set.
1299 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300 (unsigned char *)hdr, hdr->cmdsn);
1301 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1304 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1307 rc = iscsit_dump_data_payload(cmd->conn,
1308 cmd->first_burst_len, 1);
1309 target_put_sess_cmd(&cmd->se_cmd);
1311 } else if (cmd->unsolicited_data)
1312 iscsit_set_unsoliticed_dataout(cmd);
1314 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1316 * Immediate Data failed DataCRC and ERL>=1,
1317 * silently drop this PDU and let the initiator
1318 * plug the CmdSN gap.
1320 * FIXME: Send Unsolicited NOPIN with reserved
1321 * TTT here to help the initiator figure out
1322 * the missing CmdSN, although they should be
1323 * intelligent enough to determine the missing
1324 * CmdSN and issue a retry to plug the sequence.
1326 cmd->i_state = ISTATE_REMOVE;
1327 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1338 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1340 bool dump_payload = false;
1342 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1346 * Allocation iovecs needed for struct socket operations for
1347 * traditional iSCSI block I/O.
1349 if (iscsit_allocate_iovecs(cmd) < 0) {
1350 return iscsit_reject_cmd(cmd,
1351 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1353 immed_data = cmd->immediate_data;
1355 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1359 dump_payload = true;
1364 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1367 static u32 iscsit_do_crypto_hash_sg(
1368 struct ahash_request *hash,
1369 struct iscsi_cmd *cmd,
1376 struct scatterlist *sg;
1377 unsigned int page_off;
1379 crypto_ahash_init(hash);
1381 sg = cmd->first_data_sg;
1382 page_off = cmd->first_data_sg_off;
1384 while (data_length) {
1385 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1387 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1388 crypto_ahash_update(hash);
1390 data_length -= cur_len;
1392 /* iscsit_map_iovec has already checked for invalid sg pointers */
1397 struct scatterlist pad_sg;
1399 sg_init_one(&pad_sg, pad_bytes, padding);
1400 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1402 crypto_ahash_finup(hash);
1404 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1405 crypto_ahash_final(hash);
1411 static void iscsit_do_crypto_hash_buf(
1412 struct ahash_request *hash,
1419 struct scatterlist sg[2];
1421 sg_init_table(sg, ARRAY_SIZE(sg));
1422 sg_set_buf(sg, buf, payload_length);
1423 sg_set_buf(sg + 1, pad_bytes, padding);
1425 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1427 crypto_ahash_digest(hash);
1431 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1432 struct iscsi_cmd *cmd, u32 payload_length,
1435 struct iscsi_data *hdr = buf;
1436 struct se_cmd *se_cmd;
1440 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1442 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1443 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1444 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1445 payload_length, conn->cid);
1447 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1448 pr_err("Command ITT: 0x%08x received DataOUT after"
1449 " last DataOUT received, dumping payload\n",
1450 cmd->init_task_tag);
1451 return iscsit_dump_data_payload(conn, payload_length, 1);
1454 if (cmd->data_direction != DMA_TO_DEVICE) {
1455 pr_err("Command ITT: 0x%08x received DataOUT for a"
1456 " NON-WRITE command.\n", cmd->init_task_tag);
1457 return iscsit_dump_data_payload(conn, payload_length, 1);
1459 se_cmd = &cmd->se_cmd;
1460 iscsit_mod_dataout_timer(cmd);
1462 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1463 pr_err("DataOut Offset: %u, Length %u greater than"
1464 " iSCSI Command EDTL %u, protocol error.\n",
1465 hdr->offset, payload_length, cmd->se_cmd.data_length);
1466 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1469 if (cmd->unsolicited_data) {
1470 int dump_unsolicited_data = 0;
1472 if (conn->sess->sess_ops->InitialR2T) {
1473 pr_err("Received unexpected unsolicited data"
1474 " while InitialR2T=Yes, protocol error.\n");
1475 transport_send_check_condition_and_sense(&cmd->se_cmd,
1476 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1480 * Special case for dealing with Unsolicited DataOUT
1481 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1485 /* Something's amiss if we're not in WRITE_PENDING state... */
1486 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1487 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1488 dump_unsolicited_data = 1;
1490 if (dump_unsolicited_data) {
1492 * Check if a delayed TASK_ABORTED status needs to
1493 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1494 * received with the unsolicited data out.
1496 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1497 iscsit_stop_dataout_timer(cmd);
1499 transport_check_aborted_status(se_cmd,
1500 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1501 return iscsit_dump_data_payload(conn, payload_length, 1);
1505 * For the normal solicited data path:
1507 * Check for a delayed TASK_ABORTED status and dump any
1508 * incoming data out payload if one exists. Also, when the
1509 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1510 * data out sequence, we decrement outstanding_r2ts. Once
1511 * outstanding_r2ts reaches zero, go ahead and send the delayed
1512 * TASK_ABORTED status.
1514 if (se_cmd->transport_state & CMD_T_ABORTED) {
1515 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1516 if (--cmd->outstanding_r2ts < 1) {
1517 iscsit_stop_dataout_timer(cmd);
1518 transport_check_aborted_status(
1522 return iscsit_dump_data_payload(conn, payload_length, 1);
1526 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1527 * within-command recovery checks before receiving the payload.
1529 rc = iscsit_check_pre_dataout(cmd, buf);
1530 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1532 else if (rc == DATAOUT_CANNOT_RECOVER)
1537 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1540 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1541 struct iscsi_cmd **out_cmd)
1543 struct iscsi_data *hdr = buf;
1544 struct iscsi_cmd *cmd;
1545 u32 payload_length = ntoh24(hdr->dlength);
1547 bool success = false;
1549 if (!payload_length) {
1550 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1554 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1555 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1556 " MaxXmitDataSegmentLength: %u\n", payload_length,
1557 conn->conn_ops->MaxXmitDataSegmentLength);
1558 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1561 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1565 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1572 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1575 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1576 struct iscsi_data *hdr)
1579 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1580 u32 payload_length = ntoh24(hdr->dlength);
1581 int iov_ret, data_crc_failed = 0;
1583 rx_size += payload_length;
1584 iov = &cmd->iov_data[0];
1586 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1591 iov_count += iov_ret;
1593 padding = ((-payload_length) & 3);
1595 iov[iov_count].iov_base = cmd->pad_bytes;
1596 iov[iov_count++].iov_len = padding;
1598 pr_debug("Receiving %u padding bytes.\n", padding);
1601 if (conn->conn_ops->DataDigest) {
1602 iov[iov_count].iov_base = &checksum;
1603 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1604 rx_size += ISCSI_CRC_LEN;
1607 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1609 iscsit_unmap_iovec(cmd);
1611 if (rx_got != rx_size)
1614 if (conn->conn_ops->DataDigest) {
1617 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1618 be32_to_cpu(hdr->offset),
1619 payload_length, padding,
1622 if (checksum != data_crc) {
1623 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1624 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1625 " does not match computed 0x%08x\n",
1626 hdr->itt, hdr->offset, payload_length,
1627 hdr->datasn, checksum, data_crc);
1628 data_crc_failed = 1;
1630 pr_debug("Got CRC32C DataDigest 0x%08x for"
1631 " %u bytes of Data Out\n", checksum,
1636 return data_crc_failed;
1640 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1641 bool data_crc_failed)
1643 struct iscsi_conn *conn = cmd->conn;
1646 * Increment post receive data and CRC values or perform
1647 * within-command recovery.
1649 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1650 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1652 else if (rc == DATAOUT_SEND_R2T) {
1653 iscsit_set_dataout_sequence_values(cmd);
1654 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1655 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1657 * Handle extra special case for out of order
1658 * Unsolicited Data Out.
1660 spin_lock_bh(&cmd->istate_lock);
1661 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1662 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1663 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1664 spin_unlock_bh(&cmd->istate_lock);
1666 iscsit_stop_dataout_timer(cmd);
1669 target_execute_cmd(&cmd->se_cmd);
1671 } else /* DATAOUT_CANNOT_RECOVER */
1676 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1678 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1680 struct iscsi_cmd *cmd = NULL;
1681 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1683 bool data_crc_failed = false;
1685 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1691 rc = iscsit_get_dataout(conn, cmd, hdr);
1695 data_crc_failed = true;
1697 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1700 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1701 struct iscsi_nopout *hdr)
1703 u32 payload_length = ntoh24(hdr->dlength);
1705 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1706 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1708 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1709 (unsigned char *)hdr);
1711 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1712 (unsigned char *)hdr);
1715 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1716 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1717 " not set, protocol error.\n");
1719 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1720 (unsigned char *)hdr);
1722 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1723 (unsigned char *)hdr);
1726 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1727 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1728 " greater than MaxXmitDataSegmentLength: %u, protocol"
1729 " error.\n", payload_length,
1730 conn->conn_ops->MaxXmitDataSegmentLength);
1732 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1733 (unsigned char *)hdr);
1735 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1736 (unsigned char *)hdr);
1739 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1740 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1741 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1742 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1745 * This is not a response to a Unsolicited NopIN, which means
1746 * it can either be a NOPOUT ping request (with a valid ITT),
1747 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1748 * Either way, make sure we allocate an struct iscsi_cmd, as both
1749 * can contain ping data.
1751 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1752 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1753 cmd->i_state = ISTATE_SEND_NOPIN;
1754 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1756 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1757 cmd->targ_xfer_tag = 0xFFFFFFFF;
1758 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1759 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1760 cmd->data_direction = DMA_NONE;
1765 EXPORT_SYMBOL(iscsit_setup_nop_out);
1767 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1768 struct iscsi_nopout *hdr)
1770 struct iscsi_cmd *cmd_p = NULL;
1773 * Initiator is expecting a NopIN ping reply..
1775 if (hdr->itt != RESERVED_ITT) {
1777 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1778 (unsigned char *)hdr);
1780 spin_lock_bh(&conn->cmd_lock);
1781 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1782 spin_unlock_bh(&conn->cmd_lock);
1784 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1786 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1787 iscsit_add_cmd_to_response_queue(cmd, conn,
1792 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1793 (unsigned char *)hdr, hdr->cmdsn);
1794 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1796 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1802 * This was a response to a unsolicited NOPIN ping.
1804 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1805 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1809 iscsit_stop_nopin_response_timer(conn);
1811 cmd_p->i_state = ISTATE_REMOVE;
1812 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1814 iscsit_start_nopin_timer(conn);
1818 * Otherwise, initiator is not expecting a NOPIN is response.
1819 * Just ignore for now.
1823 iscsit_free_cmd(cmd, false);
1827 EXPORT_SYMBOL(iscsit_process_nop_out);
1829 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1832 unsigned char *ping_data = NULL;
1833 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1834 struct kvec *iov = NULL;
1835 u32 payload_length = ntoh24(hdr->dlength);
1838 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1842 * Handle NOP-OUT payload for traditional iSCSI sockets
1844 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1845 u32 checksum, data_crc, padding = 0;
1846 int niov = 0, rx_got, rx_size = payload_length;
1848 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1854 iov = &cmd->iov_misc[0];
1855 iov[niov].iov_base = ping_data;
1856 iov[niov++].iov_len = payload_length;
1858 padding = ((-payload_length) & 3);
1860 pr_debug("Receiving %u additional bytes"
1861 " for padding.\n", padding);
1862 iov[niov].iov_base = &cmd->pad_bytes;
1863 iov[niov++].iov_len = padding;
1866 if (conn->conn_ops->DataDigest) {
1867 iov[niov].iov_base = &checksum;
1868 iov[niov++].iov_len = ISCSI_CRC_LEN;
1869 rx_size += ISCSI_CRC_LEN;
1872 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1873 if (rx_got != rx_size) {
1878 if (conn->conn_ops->DataDigest) {
1879 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1880 ping_data, payload_length,
1881 padding, cmd->pad_bytes,
1884 if (checksum != data_crc) {
1885 pr_err("Ping data CRC32C DataDigest"
1886 " 0x%08x does not match computed 0x%08x\n",
1887 checksum, data_crc);
1888 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1889 pr_err("Unable to recover from"
1890 " NOPOUT Ping DataCRC failure while in"
1896 * Silently drop this PDU and let the
1897 * initiator plug the CmdSN gap.
1899 pr_debug("Dropping NOPOUT"
1900 " Command CmdSN: 0x%08x due to"
1901 " DataCRC error.\n", hdr->cmdsn);
1906 pr_debug("Got CRC32C DataDigest"
1907 " 0x%08x for %u bytes of ping data.\n",
1908 checksum, payload_length);
1912 ping_data[payload_length] = '\0';
1914 * Attach ping data to struct iscsi_cmd->buf_ptr.
1916 cmd->buf_ptr = ping_data;
1917 cmd->buf_ptr_size = payload_length;
1919 pr_debug("Got %u bytes of NOPOUT ping"
1920 " data.\n", payload_length);
1921 pr_debug("Ping Data: \"%s\"\n", ping_data);
1924 return iscsit_process_nop_out(conn, cmd, hdr);
1927 iscsit_free_cmd(cmd, false);
1933 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1935 switch (iscsi_tmf) {
1936 case ISCSI_TM_FUNC_ABORT_TASK:
1937 return TMR_ABORT_TASK;
1938 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1939 return TMR_ABORT_TASK_SET;
1940 case ISCSI_TM_FUNC_CLEAR_ACA:
1941 return TMR_CLEAR_ACA;
1942 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1943 return TMR_CLEAR_TASK_SET;
1944 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1945 return TMR_LUN_RESET;
1946 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1947 return TMR_TARGET_WARM_RESET;
1948 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1949 return TMR_TARGET_COLD_RESET;
1956 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1959 struct se_tmr_req *se_tmr;
1960 struct iscsi_tmr_req *tmr_req;
1961 struct iscsi_tm *hdr;
1962 int out_of_order_cmdsn = 0, ret;
1963 bool sess_ref = false;
1964 u8 function, tcm_function = TMR_UNKNOWN;
1966 hdr = (struct iscsi_tm *) buf;
1967 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1968 function = hdr->flags;
1970 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1971 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1972 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1973 hdr->rtt, hdr->refcmdsn, conn->cid);
1975 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1976 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1977 hdr->rtt != RESERVED_ITT)) {
1978 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1979 hdr->rtt = RESERVED_ITT;
1982 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1983 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1984 pr_err("Task Management Request TASK_REASSIGN not"
1985 " issued as immediate command, bad iSCSI Initiator"
1986 "implementation\n");
1987 return iscsit_add_reject_cmd(cmd,
1988 ISCSI_REASON_PROTOCOL_ERROR, buf);
1990 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1991 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1992 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1994 cmd->data_direction = DMA_NONE;
1995 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1997 return iscsit_add_reject_cmd(cmd,
1998 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2002 * TASK_REASSIGN for ERL=2 / connection stays inside of
2003 * LIO-Target $FABRIC_MOD
2005 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2006 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2007 conn->sess->se_sess, 0, DMA_NONE,
2008 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2010 target_get_sess_cmd(&cmd->se_cmd, true);
2012 tcm_function = iscsit_convert_tmf(function);
2013 if (tcm_function == TMR_UNKNOWN) {
2014 pr_err("Unknown iSCSI TMR Function:"
2015 " 0x%02x\n", function);
2016 return iscsit_add_reject_cmd(cmd,
2017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2020 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2023 return iscsit_add_reject_cmd(cmd,
2024 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2026 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2028 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2029 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2030 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2031 cmd->init_task_tag = hdr->itt;
2032 cmd->targ_xfer_tag = 0xFFFFFFFF;
2033 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2034 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2035 se_tmr = cmd->se_cmd.se_tmr_req;
2036 tmr_req = cmd->tmr_req;
2038 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2040 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2041 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2042 scsilun_to_int(&hdr->lun));
2044 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2050 case ISCSI_TM_FUNC_ABORT_TASK:
2051 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2052 if (se_tmr->response)
2055 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2056 case ISCSI_TM_FUNC_CLEAR_ACA:
2057 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2058 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2060 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2061 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2062 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2066 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2067 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2068 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2072 case ISCSI_TM_FUNC_TASK_REASSIGN:
2073 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2075 * Perform sanity checks on the ExpDataSN only if the
2076 * TASK_REASSIGN was successful.
2078 if (se_tmr->response)
2081 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2082 return iscsit_add_reject_cmd(cmd,
2083 ISCSI_REASON_BOOKMARK_INVALID, buf);
2086 pr_err("Unknown TMR function: 0x%02x, protocol"
2087 " error.\n", function);
2088 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2092 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2093 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2094 se_tmr->call_transport = 1;
2096 spin_lock_bh(&conn->cmd_lock);
2097 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2098 spin_unlock_bh(&conn->cmd_lock);
2100 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2101 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2102 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2103 out_of_order_cmdsn = 1;
2104 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2106 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2109 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2111 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2114 * Found the referenced task, send to transport for processing.
2116 if (se_tmr->call_transport)
2117 return transport_generic_handle_tmr(&cmd->se_cmd);
2120 * Could not find the referenced LUN, task, or Task Management
2121 * command not authorized or supported. Change state and
2122 * let the tx_thread send the response.
2124 * For connection recovery, this is also the default action for
2125 * TMR TASK_REASSIGN.
2128 pr_debug("Handle TMR, using sess_ref=true check\n");
2129 target_put_sess_cmd(&cmd->se_cmd);
2132 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2135 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2137 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2139 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2140 struct iscsi_text *hdr)
2142 u32 payload_length = ntoh24(hdr->dlength);
2144 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2145 pr_err("Unable to accept text parameter length: %u"
2146 "greater than MaxXmitDataSegmentLength %u.\n",
2147 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2149 (unsigned char *)hdr);
2152 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2153 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2154 pr_err("Multi sequence text commands currently not supported\n");
2155 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2156 (unsigned char *)hdr);
2159 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2160 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2161 hdr->exp_statsn, payload_length);
2163 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2164 cmd->i_state = ISTATE_SEND_TEXTRSP;
2165 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2166 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2167 cmd->targ_xfer_tag = 0xFFFFFFFF;
2168 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2169 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2170 cmd->data_direction = DMA_NONE;
2171 kfree(cmd->text_in_ptr);
2172 cmd->text_in_ptr = NULL;
2176 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2179 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2180 struct iscsi_text *hdr)
2182 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2186 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2187 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2188 pr_err("Unable to locate text_in buffer for sendtargets"
2192 goto empty_sendtargets;
2194 if (strncmp("SendTargets", text_in, 11) != 0) {
2195 pr_err("Received Text Data that is not"
2196 " SendTargets, cannot continue.\n");
2199 text_ptr = strchr(text_in, '=');
2201 pr_err("No \"=\" separator found in Text Data,"
2202 " cannot continue.\n");
2205 if (!strncmp("=All", text_ptr, 4)) {
2206 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2207 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2208 !strncmp("=eui.", text_ptr, 5)) {
2209 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2211 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2215 spin_lock_bh(&conn->cmd_lock);
2216 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2217 spin_unlock_bh(&conn->cmd_lock);
2220 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2222 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2224 (unsigned char *)hdr, hdr->cmdsn);
2225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2231 return iscsit_execute_cmd(cmd, 0);
2234 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2235 (unsigned char *)hdr);
2237 EXPORT_SYMBOL(iscsit_process_text_cmd);
2240 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2243 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2244 char *text_in = NULL;
2245 u32 payload_length = ntoh24(hdr->dlength);
2248 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2252 rx_size = payload_length;
2253 if (payload_length) {
2254 u32 checksum = 0, data_crc = 0;
2255 u32 padding = 0, pad_bytes = 0;
2256 int niov = 0, rx_got;
2259 text_in = kzalloc(payload_length, GFP_KERNEL);
2263 cmd->text_in_ptr = text_in;
2265 memset(iov, 0, 3 * sizeof(struct kvec));
2266 iov[niov].iov_base = text_in;
2267 iov[niov++].iov_len = payload_length;
2269 padding = ((-payload_length) & 3);
2271 iov[niov].iov_base = &pad_bytes;
2272 iov[niov++].iov_len = padding;
2274 pr_debug("Receiving %u additional bytes"
2275 " for padding.\n", padding);
2277 if (conn->conn_ops->DataDigest) {
2278 iov[niov].iov_base = &checksum;
2279 iov[niov++].iov_len = ISCSI_CRC_LEN;
2280 rx_size += ISCSI_CRC_LEN;
2283 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2284 if (rx_got != rx_size)
2287 if (conn->conn_ops->DataDigest) {
2288 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2289 text_in, payload_length,
2290 padding, (u8 *)&pad_bytes,
2293 if (checksum != data_crc) {
2294 pr_err("Text data CRC32C DataDigest"
2295 " 0x%08x does not match computed"
2296 " 0x%08x\n", checksum, data_crc);
2297 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2298 pr_err("Unable to recover from"
2299 " Text Data digest failure while in"
2304 * Silently drop this PDU and let the
2305 * initiator plug the CmdSN gap.
2307 pr_debug("Dropping Text"
2308 " Command CmdSN: 0x%08x due to"
2309 " DataCRC error.\n", hdr->cmdsn);
2314 pr_debug("Got CRC32C DataDigest"
2315 " 0x%08x for %u bytes of text data.\n",
2316 checksum, payload_length);
2319 text_in[payload_length - 1] = '\0';
2320 pr_debug("Successfully read %d bytes of text"
2321 " data.\n", payload_length);
2324 return iscsit_process_text_cmd(conn, cmd, hdr);
2327 kfree(cmd->text_in_ptr);
2328 cmd->text_in_ptr = NULL;
2329 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2332 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2334 struct iscsi_conn *conn_p;
2335 struct iscsi_session *sess = conn->sess;
2337 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2338 " for SID: %u.\n", conn->cid, conn->sess->sid);
2340 atomic_set(&sess->session_logout, 1);
2341 atomic_set(&conn->conn_logout_remove, 1);
2342 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2344 iscsit_inc_conn_usage_count(conn);
2345 iscsit_inc_session_usage_count(sess);
2347 spin_lock_bh(&sess->conn_lock);
2348 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2349 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2352 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2353 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2355 spin_unlock_bh(&sess->conn_lock);
2357 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2362 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2364 struct iscsi_conn *l_conn;
2365 struct iscsi_session *sess = conn->sess;
2367 pr_debug("Received logout request CLOSECONNECTION for CID:"
2368 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2371 * A Logout Request with a CLOSECONNECTION reason code for a CID
2372 * can arrive on a connection with a differing CID.
2374 if (conn->cid == cmd->logout_cid) {
2375 spin_lock_bh(&conn->state_lock);
2376 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2377 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2379 atomic_set(&conn->conn_logout_remove, 1);
2380 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2381 iscsit_inc_conn_usage_count(conn);
2383 spin_unlock_bh(&conn->state_lock);
2386 * Handle all different cid CLOSECONNECTION requests in
2387 * iscsit_logout_post_handler_diffcid() as to give enough
2388 * time for any non immediate command's CmdSN to be
2389 * acknowledged on the connection in question.
2391 * Here we simply make sure the CID is still around.
2393 l_conn = iscsit_get_conn_from_cid(sess,
2396 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2397 iscsit_add_cmd_to_response_queue(cmd, conn,
2402 iscsit_dec_conn_usage_count(l_conn);
2405 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2410 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2412 struct iscsi_session *sess = conn->sess;
2414 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2415 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2417 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2418 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419 " while ERL!=2.\n");
2420 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2421 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2425 if (conn->cid == cmd->logout_cid) {
2426 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2427 " with CID: %hu on CID: %hu, implementation error.\n",
2428 cmd->logout_cid, conn->cid);
2429 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2430 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2434 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2440 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2443 int cmdsn_ret, logout_remove = 0;
2445 struct iscsi_logout *hdr;
2446 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2448 hdr = (struct iscsi_logout *) buf;
2449 reason_code = (hdr->flags & 0x7f);
2452 spin_lock(&tiqn->logout_stats.lock);
2453 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2454 tiqn->logout_stats.normal_logouts++;
2456 tiqn->logout_stats.abnormal_logouts++;
2457 spin_unlock(&tiqn->logout_stats.lock);
2460 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2461 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2462 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2463 hdr->cid, conn->cid);
2465 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2466 pr_err("Received logout request on connection that"
2467 " is not in logged in state, ignoring request.\n");
2468 iscsit_free_cmd(cmd, false);
2472 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2473 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2474 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2475 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2476 cmd->targ_xfer_tag = 0xFFFFFFFF;
2477 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2478 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2479 cmd->logout_cid = be16_to_cpu(hdr->cid);
2480 cmd->logout_reason = reason_code;
2481 cmd->data_direction = DMA_NONE;
2484 * We need to sleep in these cases (by returning 1) until the Logout
2485 * Response gets sent in the tx thread.
2487 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2488 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2489 be16_to_cpu(hdr->cid) == conn->cid))
2492 spin_lock_bh(&conn->cmd_lock);
2493 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2494 spin_unlock_bh(&conn->cmd_lock);
2496 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2497 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2500 * Immediate commands are executed, well, immediately.
2501 * Non-Immediate Logout Commands are executed in CmdSN order.
2503 if (cmd->immediate_cmd) {
2504 int ret = iscsit_execute_cmd(cmd, 0);
2509 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2510 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2512 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2516 return logout_remove;
2518 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2520 int iscsit_handle_snack(
2521 struct iscsi_conn *conn,
2524 struct iscsi_snack *hdr;
2526 hdr = (struct iscsi_snack *) buf;
2527 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2529 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2530 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2531 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2532 hdr->begrun, hdr->runlength, conn->cid);
2534 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2535 pr_err("Initiator sent SNACK request while in"
2536 " ErrorRecoveryLevel=0.\n");
2537 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2541 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2542 * call from inside iscsi_send_recovery_datain_or_r2t().
2544 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2546 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2548 be32_to_cpu(hdr->ttt),
2549 be32_to_cpu(hdr->begrun),
2550 be32_to_cpu(hdr->runlength));
2551 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2552 return iscsit_handle_status_snack(conn, hdr->itt,
2553 be32_to_cpu(hdr->ttt),
2554 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2555 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2556 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2557 be32_to_cpu(hdr->begrun),
2558 be32_to_cpu(hdr->runlength));
2559 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2560 /* FIXME: Support R-Data SNACK */
2561 pr_err("R-Data SNACK Not Supported.\n");
2562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2565 pr_err("Unknown SNACK type 0x%02x, protocol"
2566 " error.\n", hdr->flags & 0x0f);
2567 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2573 EXPORT_SYMBOL(iscsit_handle_snack);
2575 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2577 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2578 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2579 wait_for_completion_interruptible_timeout(
2580 &conn->rx_half_close_comp,
2581 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2585 static int iscsit_handle_immediate_data(
2586 struct iscsi_cmd *cmd,
2587 struct iscsi_scsi_req *hdr,
2590 int iov_ret, rx_got = 0, rx_size = 0;
2591 u32 checksum, iov_count = 0, padding = 0;
2592 struct iscsi_conn *conn = cmd->conn;
2595 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2597 return IMMEDIATE_DATA_CANNOT_RECOVER;
2600 iov_count = iov_ret;
2601 iov = &cmd->iov_data[0];
2603 padding = ((-length) & 3);
2605 iov[iov_count].iov_base = cmd->pad_bytes;
2606 iov[iov_count++].iov_len = padding;
2610 if (conn->conn_ops->DataDigest) {
2611 iov[iov_count].iov_base = &checksum;
2612 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2613 rx_size += ISCSI_CRC_LEN;
2616 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2618 iscsit_unmap_iovec(cmd);
2620 if (rx_got != rx_size) {
2621 iscsit_rx_thread_wait_for_tcp(conn);
2622 return IMMEDIATE_DATA_CANNOT_RECOVER;
2625 if (conn->conn_ops->DataDigest) {
2628 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2629 cmd->write_data_done, length, padding,
2632 if (checksum != data_crc) {
2633 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2634 " does not match computed 0x%08x\n", checksum,
2637 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2638 pr_err("Unable to recover from"
2639 " Immediate Data digest failure while"
2641 iscsit_reject_cmd(cmd,
2642 ISCSI_REASON_DATA_DIGEST_ERROR,
2643 (unsigned char *)hdr);
2644 return IMMEDIATE_DATA_CANNOT_RECOVER;
2646 iscsit_reject_cmd(cmd,
2647 ISCSI_REASON_DATA_DIGEST_ERROR,
2648 (unsigned char *)hdr);
2649 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2652 pr_debug("Got CRC32C DataDigest 0x%08x for"
2653 " %u bytes of Immediate Data\n", checksum,
2658 cmd->write_data_done += length;
2660 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2661 spin_lock_bh(&cmd->istate_lock);
2662 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2663 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2664 spin_unlock_bh(&cmd->istate_lock);
2667 return IMMEDIATE_DATA_NORMAL_OPERATION;
2671 * Called with sess->conn_lock held.
2673 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2674 with active network interface */
2675 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2677 struct iscsi_cmd *cmd;
2678 struct iscsi_conn *conn_p;
2682 * Only send a Asynchronous Message on connections whos network
2683 * interface is still functional.
2685 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2686 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2687 iscsit_inc_conn_usage_count(conn_p);
2696 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2698 iscsit_dec_conn_usage_count(conn_p);
2702 cmd->logout_cid = conn->cid;
2703 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2704 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2706 spin_lock_bh(&conn_p->cmd_lock);
2707 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2708 spin_unlock_bh(&conn_p->cmd_lock);
2710 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2711 iscsit_dec_conn_usage_count(conn_p);
2714 static int iscsit_send_conn_drop_async_message(
2715 struct iscsi_cmd *cmd,
2716 struct iscsi_conn *conn)
2718 struct iscsi_async *hdr;
2720 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2722 hdr = (struct iscsi_async *) cmd->pdu;
2723 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2724 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2725 cmd->init_task_tag = RESERVED_ITT;
2726 cmd->targ_xfer_tag = 0xFFFFFFFF;
2727 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2728 cmd->stat_sn = conn->stat_sn++;
2729 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2730 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2731 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2732 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2733 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2734 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2735 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2737 pr_debug("Sending Connection Dropped Async Message StatSN:"
2738 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2739 cmd->logout_cid, conn->cid);
2741 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2744 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2746 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2747 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2748 wait_for_completion_interruptible_timeout(
2749 &conn->tx_half_close_comp,
2750 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2755 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2756 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2759 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2760 hdr->flags = datain->flags;
2761 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2762 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2763 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2764 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2765 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2766 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2767 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2770 hton24(hdr->dlength, datain->length);
2771 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2772 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2773 (struct scsi_lun *)&hdr->lun);
2775 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2777 hdr->itt = cmd->init_task_tag;
2779 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2780 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2782 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2784 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2786 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2788 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2789 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2790 hdr->datasn = cpu_to_be32(datain->data_sn);
2791 hdr->offset = cpu_to_be32(datain->offset);
2793 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2794 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2795 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2796 ntohl(hdr->offset), datain->length, conn->cid);
2798 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2800 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2802 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2803 struct iscsi_datain datain;
2804 struct iscsi_datain_req *dr;
2806 bool set_statsn = false;
2808 memset(&datain, 0, sizeof(struct iscsi_datain));
2809 dr = iscsit_get_datain_values(cmd, &datain);
2811 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2812 cmd->init_task_tag);
2816 * Be paranoid and double check the logic for now.
2818 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2819 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2820 " datain.length: %u exceeds cmd->data_length: %u\n",
2821 cmd->init_task_tag, datain.offset, datain.length,
2822 cmd->se_cmd.data_length);
2826 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2828 * Special case for successfully execution w/ both DATAIN
2831 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2832 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2833 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2835 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2836 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2837 iscsit_increment_maxcmdsn(cmd, conn->sess);
2838 cmd->stat_sn = conn->stat_sn++;
2840 } else if (dr->dr_complete ==
2841 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2845 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2847 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2851 if (dr->dr_complete) {
2852 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2854 iscsit_free_datain_req(cmd, dr);
2861 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2862 struct iscsi_logout_rsp *hdr)
2864 struct iscsi_conn *logout_conn = NULL;
2865 struct iscsi_conn_recovery *cr = NULL;
2866 struct iscsi_session *sess = conn->sess;
2868 * The actual shutting down of Sessions and/or Connections
2869 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2870 * is done in scsi_logout_post_handler().
2872 switch (cmd->logout_reason) {
2873 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2874 pr_debug("iSCSI session logout successful, setting"
2875 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2876 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2878 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2879 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2882 * For CLOSECONNECTION logout requests carrying
2883 * a matching logout CID -> local CID, the reference
2884 * for the local CID will have been incremented in
2885 * iscsi_logout_closeconnection().
2887 * For CLOSECONNECTION logout requests carrying
2888 * a different CID than the connection it arrived
2889 * on, the connection responding to cmd->logout_cid
2890 * is stopped in iscsit_logout_post_handler_diffcid().
2893 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2894 " successful.\n", cmd->logout_cid, conn->cid);
2895 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2897 case ISCSI_LOGOUT_REASON_RECOVERY:
2898 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2899 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2902 * If the connection is still active from our point of view
2903 * force connection recovery to occur.
2905 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2908 iscsit_connection_reinstatement_rcfr(logout_conn);
2909 iscsit_dec_conn_usage_count(logout_conn);
2912 cr = iscsit_get_inactive_connection_recovery_entry(
2913 conn->sess, cmd->logout_cid);
2915 pr_err("Unable to locate CID: %hu for"
2916 " REMOVECONNFORRECOVERY Logout Request.\n",
2918 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2922 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2924 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2925 " for recovery for CID: %hu on CID: %hu successful.\n",
2926 cmd->logout_cid, conn->cid);
2927 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2930 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2931 cmd->logout_reason);
2935 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2936 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2937 hdr->response = cmd->logout_response;
2938 hdr->itt = cmd->init_task_tag;
2939 cmd->stat_sn = conn->stat_sn++;
2940 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2942 iscsit_increment_maxcmdsn(cmd, conn->sess);
2943 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2944 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2946 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2947 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2948 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2949 cmd->logout_cid, conn->cid);
2953 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2956 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2960 rc = iscsit_build_logout_rsp(cmd, conn,
2961 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2965 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2969 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2970 struct iscsi_nopin *hdr, bool nopout_response)
2972 hdr->opcode = ISCSI_OP_NOOP_IN;
2973 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2974 hton24(hdr->dlength, cmd->buf_ptr_size);
2975 if (nopout_response)
2976 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2977 hdr->itt = cmd->init_task_tag;
2978 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2979 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2981 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2983 if (nopout_response)
2984 iscsit_increment_maxcmdsn(cmd, conn->sess);
2986 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2987 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2989 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2990 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2991 "Solicited" : "Unsolicited", cmd->init_task_tag,
2992 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2994 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2997 * Unsolicited NOPIN, either requesting a response or not.
2999 static int iscsit_send_unsolicited_nopin(
3000 struct iscsi_cmd *cmd,
3001 struct iscsi_conn *conn,
3004 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3007 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3009 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3010 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3012 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3016 spin_lock_bh(&cmd->istate_lock);
3017 cmd->i_state = want_response ?
3018 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3019 spin_unlock_bh(&cmd->istate_lock);
3025 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3027 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3029 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3032 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3033 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3035 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3037 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3042 static int iscsit_send_r2t(
3043 struct iscsi_cmd *cmd,
3044 struct iscsi_conn *conn)
3046 struct iscsi_r2t *r2t;
3047 struct iscsi_r2t_rsp *hdr;
3050 r2t = iscsit_get_r2t_from_list(cmd);
3054 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3055 memset(hdr, 0, ISCSI_HDR_LEN);
3056 hdr->opcode = ISCSI_OP_R2T;
3057 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3058 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3059 (struct scsi_lun *)&hdr->lun);
3060 hdr->itt = cmd->init_task_tag;
3061 if (conn->conn_transport->iscsit_get_r2t_ttt)
3062 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3064 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3065 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3066 hdr->statsn = cpu_to_be32(conn->stat_sn);
3067 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3068 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3069 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3070 hdr->data_offset = cpu_to_be32(r2t->offset);
3071 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3073 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3074 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3075 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3076 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3077 r2t->offset, r2t->xfer_len, conn->cid);
3079 spin_lock_bh(&cmd->r2t_lock);
3081 spin_unlock_bh(&cmd->r2t_lock);
3083 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3088 spin_lock_bh(&cmd->dataout_timeout_lock);
3089 iscsit_start_dataout_timer(cmd, conn);
3090 spin_unlock_bh(&cmd->dataout_timeout_lock);
3096 * @recovery: If called from iscsi_task_reassign_complete_write() for
3097 * connection recovery.
3099 int iscsit_build_r2ts_for_cmd(
3100 struct iscsi_conn *conn,
3101 struct iscsi_cmd *cmd,
3105 u32 offset = 0, xfer_len = 0;
3107 spin_lock_bh(&cmd->r2t_lock);
3108 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3109 spin_unlock_bh(&cmd->r2t_lock);
3113 if (conn->sess->sess_ops->DataSequenceInOrder &&
3115 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3117 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3118 if (conn->sess->sess_ops->DataSequenceInOrder) {
3119 offset = cmd->r2t_offset;
3121 if (first_r2t && recovery) {
3122 int new_data_end = offset +
3123 conn->sess->sess_ops->MaxBurstLength -
3124 cmd->next_burst_len;
3126 if (new_data_end > cmd->se_cmd.data_length)
3127 xfer_len = cmd->se_cmd.data_length - offset;
3130 conn->sess->sess_ops->MaxBurstLength -
3131 cmd->next_burst_len;
3133 int new_data_end = offset +
3134 conn->sess->sess_ops->MaxBurstLength;
3136 if (new_data_end > cmd->se_cmd.data_length)
3137 xfer_len = cmd->se_cmd.data_length - offset;
3139 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3141 cmd->r2t_offset += xfer_len;
3143 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3144 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3146 struct iscsi_seq *seq;
3148 seq = iscsit_get_seq_holder_for_r2t(cmd);
3150 spin_unlock_bh(&cmd->r2t_lock);
3154 offset = seq->offset;
3155 xfer_len = seq->xfer_len;
3157 if (cmd->seq_send_order == cmd->seq_count)
3158 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3160 cmd->outstanding_r2ts++;
3163 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3164 spin_unlock_bh(&cmd->r2t_lock);
3168 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3171 spin_unlock_bh(&cmd->r2t_lock);
3175 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3177 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3178 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3181 cmd->stat_sn = conn->stat_sn++;
3183 atomic_long_inc(&conn->sess->rsp_pdus);
3185 memset(hdr, 0, ISCSI_HDR_LEN);
3186 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3187 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3188 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3189 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3190 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3191 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3192 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3193 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3195 hdr->response = cmd->iscsi_response;
3196 hdr->cmd_status = cmd->se_cmd.scsi_status;
3197 hdr->itt = cmd->init_task_tag;
3198 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3200 iscsit_increment_maxcmdsn(cmd, conn->sess);
3201 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3202 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3204 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3205 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3206 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3207 cmd->se_cmd.scsi_status, conn->cid);
3209 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3211 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3213 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3214 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3215 void *data_buf = NULL;
3216 u32 padding = 0, data_buf_len = 0;
3218 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3221 * Attach SENSE DATA payload to iSCSI Response PDU
3223 if (cmd->se_cmd.sense_buffer &&
3224 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3225 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3226 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3227 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3229 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3230 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3231 data_buf = cmd->sense_buffer;
3232 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3235 memset(cmd->sense_buffer +
3236 cmd->se_cmd.scsi_sense_length, 0, padding);
3237 pr_debug("Adding %u bytes of padding to"
3238 " SENSE.\n", padding);
3241 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3243 cmd->se_cmd.scsi_sense_length);
3246 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3250 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3252 switch (se_tmr->response) {
3253 case TMR_FUNCTION_COMPLETE:
3254 return ISCSI_TMF_RSP_COMPLETE;
3255 case TMR_TASK_DOES_NOT_EXIST:
3256 return ISCSI_TMF_RSP_NO_TASK;
3257 case TMR_LUN_DOES_NOT_EXIST:
3258 return ISCSI_TMF_RSP_NO_LUN;
3259 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3260 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3261 case TMR_FUNCTION_REJECTED:
3263 return ISCSI_TMF_RSP_REJECTED;
3268 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3269 struct iscsi_tm_rsp *hdr)
3271 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3273 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3274 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3275 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3276 hdr->itt = cmd->init_task_tag;
3277 cmd->stat_sn = conn->stat_sn++;
3278 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3280 iscsit_increment_maxcmdsn(cmd, conn->sess);
3281 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3282 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3284 pr_debug("Built Task Management Response ITT: 0x%08x,"
3285 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3286 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3288 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3291 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3293 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3295 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3297 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3300 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3304 if (np->np_sockaddr.ss_family == AF_INET6) {
3305 const struct sockaddr_in6 sin6 = {
3306 .sin6_addr = IN6ADDR_ANY_INIT };
3307 struct sockaddr_in6 *sock_in6 =
3308 (struct sockaddr_in6 *)&np->np_sockaddr;
3310 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3311 sin6.sin6_addr.s6_addr, 16))
3314 struct sockaddr_in * sock_in =
3315 (struct sockaddr_in *)&np->np_sockaddr;
3317 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3324 #define SENDTARGETS_BUF_LIMIT 32768U
3327 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3328 enum iscsit_transport_type network_transport,
3329 int skip_bytes, bool *completed)
3331 char *payload = NULL;
3332 struct iscsi_conn *conn = cmd->conn;
3333 struct iscsi_portal_group *tpg;
3334 struct iscsi_tiqn *tiqn;
3335 struct iscsi_tpg_np *tpg_np;
3336 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3337 int target_name_printed;
3338 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3339 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3342 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3343 SENDTARGETS_BUF_LIMIT);
3345 payload = kzalloc(buffer_len, GFP_KERNEL);
3350 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3353 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3354 text_ptr = strchr(text_in, '=');
3356 pr_err("Unable to locate '=' string in text_in:"
3362 * Skip over '=' character..
3367 spin_lock(&tiqn_lock);
3368 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3369 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3370 strcmp(tiqn->tiqn, text_ptr)) {
3374 target_name_printed = 0;
3376 spin_lock(&tiqn->tiqn_tpg_lock);
3377 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3379 /* If demo_mode_discovery=0 and generate_node_acls=0
3380 * (demo mode dislabed) do not return
3381 * TargetName+TargetAddress unless a NodeACL exists.
3384 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3385 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3386 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3387 cmd->conn->sess->sess_ops->InitiatorName))) {
3391 spin_lock(&tpg->tpg_state_lock);
3392 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3393 spin_unlock(&tpg->tpg_state_lock);
3395 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3398 spin_lock(&tpg->tpg_np_lock);
3399 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3401 struct iscsi_np *np = tpg_np->tpg_np;
3402 bool inaddr_any = iscsit_check_inaddr_any(np);
3403 struct sockaddr_storage *sockaddr;
3405 if (np->np_network_transport != network_transport)
3408 if (!target_name_printed) {
3409 len = sprintf(buf, "TargetName=%s",
3413 if ((len + payload_len) > buffer_len) {
3414 spin_unlock(&tpg->tpg_np_lock);
3415 spin_unlock(&tiqn->tiqn_tpg_lock);
3420 if (skip_bytes && len <= skip_bytes) {
3423 memcpy(payload + payload_len, buf, len);
3425 target_name_printed = 1;
3426 if (len > skip_bytes)
3432 sockaddr = &conn->local_sockaddr;
3434 sockaddr = &np->np_sockaddr;
3436 len = sprintf(buf, "TargetAddress="
3442 if ((len + payload_len) > buffer_len) {
3443 spin_unlock(&tpg->tpg_np_lock);
3444 spin_unlock(&tiqn->tiqn_tpg_lock);
3449 if (skip_bytes && len <= skip_bytes) {
3452 memcpy(payload + payload_len, buf, len);
3454 if (len > skip_bytes)
3458 spin_unlock(&tpg->tpg_np_lock);
3460 spin_unlock(&tiqn->tiqn_tpg_lock);
3467 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3470 spin_unlock(&tiqn_lock);
3472 cmd->buf_ptr = payload;
3478 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3479 struct iscsi_text_rsp *hdr,
3480 enum iscsit_transport_type network_transport)
3482 int text_length, padding;
3483 bool completed = true;
3485 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3486 cmd->read_data_done,
3488 if (text_length < 0)
3492 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3494 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3495 cmd->read_data_done += text_length;
3496 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3497 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3499 hdr->opcode = ISCSI_OP_TEXT_RSP;
3500 padding = ((-text_length) & 3);
3501 hton24(hdr->dlength, text_length);
3502 hdr->itt = cmd->init_task_tag;
3503 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3504 cmd->stat_sn = conn->stat_sn++;
3505 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3507 iscsit_increment_maxcmdsn(cmd, conn->sess);
3509 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3510 * correctly increment MaxCmdSN for each response answering a
3511 * non immediate text request with a valid CmdSN.
3513 cmd->maxcmdsn_inc = 0;
3514 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3515 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3517 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3518 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3519 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3520 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3521 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3523 return text_length + padding;
3525 EXPORT_SYMBOL(iscsit_build_text_rsp);
3527 static int iscsit_send_text_rsp(
3528 struct iscsi_cmd *cmd,
3529 struct iscsi_conn *conn)
3531 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3534 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3535 conn->conn_transport->transport_type);
3536 if (text_length < 0)
3539 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3545 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3546 struct iscsi_reject *hdr)
3548 hdr->opcode = ISCSI_OP_REJECT;
3549 hdr->reason = cmd->reject_reason;
3550 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3551 hton24(hdr->dlength, ISCSI_HDR_LEN);
3552 hdr->ffffffff = cpu_to_be32(0xffffffff);
3553 cmd->stat_sn = conn->stat_sn++;
3554 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3555 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3556 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3559 EXPORT_SYMBOL(iscsit_build_reject);
3561 static int iscsit_send_reject(
3562 struct iscsi_cmd *cmd,
3563 struct iscsi_conn *conn)
3565 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3567 iscsit_build_reject(cmd, conn, hdr);
3569 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3570 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3572 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3577 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3581 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3582 * within iscsit_start_kthreads()
3584 * Here we use bitmap_id to determine which CPU that this
3585 * iSCSI connection's RX/TX threads will be scheduled to
3588 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3589 for_each_online_cpu(cpu) {
3591 cpumask_set_cpu(cpu, conn->conn_cpumask);
3596 * This should never be reached..
3599 cpumask_setall(conn->conn_cpumask);
3603 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3608 case ISTATE_SEND_R2T:
3609 ret = iscsit_send_r2t(cmd, conn);
3614 spin_lock_bh(&conn->cmd_lock);
3615 list_del_init(&cmd->i_conn_node);
3616 spin_unlock_bh(&conn->cmd_lock);
3618 iscsit_free_cmd(cmd, false);
3620 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3621 iscsit_mod_nopin_response_timer(conn);
3622 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3626 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3627 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3632 pr_err("Unknown Opcode: 0x%02x ITT:"
3633 " 0x%08x, i_state: %d on CID: %hu\n",
3634 cmd->iscsi_opcode, cmd->init_task_tag, state,
3644 EXPORT_SYMBOL(iscsit_immediate_queue);
3647 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3649 struct iscsit_transport *t = conn->conn_transport;
3650 struct iscsi_queue_req *qr;
3651 struct iscsi_cmd *cmd;
3655 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3656 atomic_set(&conn->check_immediate_queue, 0);
3659 kmem_cache_free(lio_qr_cache, qr);
3661 ret = t->iscsit_immediate_queue(conn, cmd, state);
3670 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3676 case ISTATE_SEND_DATAIN:
3677 ret = iscsit_send_datain(cmd, conn);
3682 goto check_rsp_state;
3683 else if (ret == 1) {
3685 spin_lock_bh(&cmd->istate_lock);
3686 cmd->i_state = ISTATE_SENT_STATUS;
3687 spin_unlock_bh(&cmd->istate_lock);
3689 if (atomic_read(&conn->check_immediate_queue))
3693 } else if (ret == 2) {
3694 /* Still must send status,
3695 SCF_TRANSPORT_TASK_SENSE was set */
3696 spin_lock_bh(&cmd->istate_lock);
3697 cmd->i_state = ISTATE_SEND_STATUS;
3698 spin_unlock_bh(&cmd->istate_lock);
3699 state = ISTATE_SEND_STATUS;
3700 goto check_rsp_state;
3704 case ISTATE_SEND_STATUS:
3705 case ISTATE_SEND_STATUS_RECOVERY:
3706 ret = iscsit_send_response(cmd, conn);
3708 case ISTATE_SEND_LOGOUTRSP:
3709 ret = iscsit_send_logout(cmd, conn);
3711 case ISTATE_SEND_ASYNCMSG:
3712 ret = iscsit_send_conn_drop_async_message(
3715 case ISTATE_SEND_NOPIN:
3716 ret = iscsit_send_nopin(cmd, conn);
3718 case ISTATE_SEND_REJECT:
3719 ret = iscsit_send_reject(cmd, conn);
3721 case ISTATE_SEND_TASKMGTRSP:
3722 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3725 ret = iscsit_tmr_post_handler(cmd, conn);
3727 iscsit_fall_back_to_erl0(conn->sess);
3729 case ISTATE_SEND_TEXTRSP:
3730 ret = iscsit_send_text_rsp(cmd, conn);
3733 pr_err("Unknown Opcode: 0x%02x ITT:"
3734 " 0x%08x, i_state: %d on CID: %hu\n",
3735 cmd->iscsi_opcode, cmd->init_task_tag,
3743 case ISTATE_SEND_LOGOUTRSP:
3744 if (!iscsit_logout_post_handler(cmd, conn))
3747 case ISTATE_SEND_STATUS:
3748 case ISTATE_SEND_ASYNCMSG:
3749 case ISTATE_SEND_NOPIN:
3750 case ISTATE_SEND_STATUS_RECOVERY:
3751 case ISTATE_SEND_TEXTRSP:
3752 case ISTATE_SEND_TASKMGTRSP:
3753 case ISTATE_SEND_REJECT:
3754 spin_lock_bh(&cmd->istate_lock);
3755 cmd->i_state = ISTATE_SENT_STATUS;
3756 spin_unlock_bh(&cmd->istate_lock);
3759 pr_err("Unknown Opcode: 0x%02x ITT:"
3760 " 0x%08x, i_state: %d on CID: %hu\n",
3761 cmd->iscsi_opcode, cmd->init_task_tag,
3762 cmd->i_state, conn->cid);
3766 if (atomic_read(&conn->check_immediate_queue))
3774 EXPORT_SYMBOL(iscsit_response_queue);
3776 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3778 struct iscsit_transport *t = conn->conn_transport;
3779 struct iscsi_queue_req *qr;
3780 struct iscsi_cmd *cmd;
3784 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3787 kmem_cache_free(lio_qr_cache, qr);
3789 ret = t->iscsit_response_queue(conn, cmd, state);
3790 if (ret == 1 || ret < 0)
3797 int iscsi_target_tx_thread(void *arg)
3800 struct iscsi_conn *conn = arg;
3801 bool conn_freed = false;
3804 * Allow ourselves to be interrupted by SIGINT so that a
3805 * connection recovery / failure event can be triggered externally.
3807 allow_signal(SIGINT);
3809 while (!kthread_should_stop()) {
3811 * Ensure that both TX and RX per connection kthreads
3812 * are scheduled to run on the same CPU.
3814 iscsit_thread_check_cpumask(conn, current, 1);
3816 wait_event_interruptible(conn->queues_wq,
3817 !iscsit_conn_all_queues_empty(conn));
3819 if (signal_pending(current))
3823 ret = iscsit_handle_immediate_queue(conn);
3827 ret = iscsit_handle_response_queue(conn);
3830 } else if (ret == -ECONNRESET) {
3833 } else if (ret < 0) {
3840 * Avoid the normal connection failure code-path if this connection
3841 * is still within LOGIN mode, and iscsi_np process context is
3842 * responsible for cleaning up the early connection failure.
3844 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3845 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3848 while (!kthread_should_stop()) {
3855 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3857 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3858 struct iscsi_cmd *cmd;
3861 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3862 case ISCSI_OP_SCSI_CMD:
3863 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3867 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3869 case ISCSI_OP_SCSI_DATA_OUT:
3870 ret = iscsit_handle_data_out(conn, buf);
3872 case ISCSI_OP_NOOP_OUT:
3874 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3875 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3879 ret = iscsit_handle_nop_out(conn, cmd, buf);
3881 case ISCSI_OP_SCSI_TMFUNC:
3882 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3886 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3889 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3890 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3894 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3899 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3901 case ISCSI_OP_LOGOUT:
3902 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3906 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3908 wait_for_completion_timeout(&conn->conn_logout_comp,
3909 SECONDS_FOR_LOGOUT_COMP * HZ);
3911 case ISCSI_OP_SNACK:
3912 ret = iscsit_handle_snack(conn, buf);
3915 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3916 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3917 pr_err("Cannot recover from unknown"
3918 " opcode while ERL=0, closing iSCSI connection.\n");
3921 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3922 " closing iSCSI connection.\n");
3929 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3932 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3936 spin_lock_bh(&conn->state_lock);
3937 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3938 spin_unlock_bh(&conn->state_lock);
3943 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3946 u8 buffer[ISCSI_HDR_LEN], opcode;
3947 u32 checksum = 0, digest = 0;
3950 while (!kthread_should_stop()) {
3952 * Ensure that both TX and RX per connection kthreads
3953 * are scheduled to run on the same CPU.
3955 iscsit_thread_check_cpumask(conn, current, 0);
3957 memset(buffer, 0, ISCSI_HDR_LEN);
3958 memset(&iov, 0, sizeof(struct kvec));
3960 iov.iov_base = buffer;
3961 iov.iov_len = ISCSI_HDR_LEN;
3963 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3964 if (ret != ISCSI_HDR_LEN) {
3965 iscsit_rx_thread_wait_for_tcp(conn);
3969 if (conn->conn_ops->HeaderDigest) {
3970 iov.iov_base = &digest;
3971 iov.iov_len = ISCSI_CRC_LEN;
3973 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3974 if (ret != ISCSI_CRC_LEN) {
3975 iscsit_rx_thread_wait_for_tcp(conn);
3979 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3980 buffer, ISCSI_HDR_LEN,
3981 0, NULL, (u8 *)&checksum);
3983 if (digest != checksum) {
3984 pr_err("HeaderDigest CRC32C failed,"
3985 " received 0x%08x, computed 0x%08x\n",
3988 * Set the PDU to 0xff so it will intentionally
3989 * hit default in the switch below.
3991 memset(buffer, 0xff, ISCSI_HDR_LEN);
3992 atomic_long_inc(&conn->sess->conn_digest_errors);
3994 pr_debug("Got HeaderDigest CRC32C"
3995 " 0x%08x\n", checksum);
3999 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4002 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4004 if (conn->sess->sess_ops->SessionType &&
4005 ((!(opcode & ISCSI_OP_TEXT)) ||
4006 (!(opcode & ISCSI_OP_LOGOUT)))) {
4007 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4008 " while in Discovery Session, rejecting.\n", opcode);
4009 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4014 ret = iscsi_target_rx_opcode(conn, buffer);
4020 int iscsi_target_rx_thread(void *arg)
4023 struct iscsi_conn *conn = arg;
4024 bool conn_freed = false;
4027 * Allow ourselves to be interrupted by SIGINT so that a
4028 * connection recovery / failure event can be triggered externally.
4030 allow_signal(SIGINT);
4032 * Wait for iscsi_post_login_handler() to complete before allowing
4033 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4035 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4036 if (rc < 0 || iscsi_target_check_conn_state(conn))
4039 if (!conn->conn_transport->iscsit_get_rx_pdu)
4042 conn->conn_transport->iscsit_get_rx_pdu(conn);
4044 if (!signal_pending(current))
4045 atomic_set(&conn->transport_failed, 1);
4046 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4050 while (!kthread_should_stop()) {
4058 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4060 LIST_HEAD(tmp_list);
4061 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4062 struct iscsi_session *sess = conn->sess;
4064 * We expect this function to only ever be called from either RX or TX
4065 * thread context via iscsit_close_connection() once the other context
4066 * has been reset -> returned sleeping pre-handler state.
4068 spin_lock_bh(&conn->cmd_lock);
4069 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4071 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4072 struct se_cmd *se_cmd = &cmd->se_cmd;
4074 if (se_cmd->se_tfo != NULL) {
4075 spin_lock(&se_cmd->t_state_lock);
4076 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4077 spin_unlock(&se_cmd->t_state_lock);
4080 spin_unlock_bh(&conn->cmd_lock);
4082 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4083 list_del_init(&cmd->i_conn_node);
4085 iscsit_increment_maxcmdsn(cmd, sess);
4086 iscsit_free_cmd(cmd, true);
4091 static void iscsit_stop_timers_for_cmds(
4092 struct iscsi_conn *conn)
4094 struct iscsi_cmd *cmd;
4096 spin_lock_bh(&conn->cmd_lock);
4097 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4098 if (cmd->data_direction == DMA_TO_DEVICE)
4099 iscsit_stop_dataout_timer(cmd);
4101 spin_unlock_bh(&conn->cmd_lock);
4104 int iscsit_close_connection(
4105 struct iscsi_conn *conn)
4107 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4108 struct iscsi_session *sess = conn->sess;
4110 pr_debug("Closing iSCSI connection CID %hu on SID:"
4111 " %u\n", conn->cid, sess->sid);
4113 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4114 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4115 * sleeping and the logout response never got sent because the
4116 * connection failed.
4118 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4119 * to signal logout response TX interrupt completion. Go ahead and skip
4120 * this for iser since isert_rx_opcode() does not wait on logout failure,
4121 * and to avoid iscsi_conn pointer dereference in iser-target code.
4123 if (!conn->conn_transport->rdma_shutdown)
4124 complete(&conn->conn_logout_comp);
4126 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4127 if (conn->tx_thread &&
4128 cmpxchg(&conn->tx_thread_active, true, false)) {
4129 send_sig(SIGINT, conn->tx_thread, 1);
4130 kthread_stop(conn->tx_thread);
4132 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4133 if (conn->rx_thread &&
4134 cmpxchg(&conn->rx_thread_active, true, false)) {
4135 send_sig(SIGINT, conn->rx_thread, 1);
4136 kthread_stop(conn->rx_thread);
4140 spin_lock(&iscsit_global->ts_bitmap_lock);
4141 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4143 spin_unlock(&iscsit_global->ts_bitmap_lock);
4145 iscsit_stop_timers_for_cmds(conn);
4146 iscsit_stop_nopin_response_timer(conn);
4147 iscsit_stop_nopin_timer(conn);
4149 if (conn->conn_transport->iscsit_wait_conn)
4150 conn->conn_transport->iscsit_wait_conn(conn);
4153 * During Connection recovery drop unacknowledged out of order
4154 * commands for this connection, and prepare the other commands
4157 * During normal operation clear the out of order commands (but
4158 * do not free the struct iscsi_ooo_cmdsn's) and release all
4159 * struct iscsi_cmds.
4161 if (atomic_read(&conn->connection_recovery)) {
4162 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4163 iscsit_prepare_cmds_for_reallegiance(conn);
4165 iscsit_clear_ooo_cmdsns_for_conn(conn);
4166 iscsit_release_commands_from_conn(conn);
4168 iscsit_free_queue_reqs_for_conn(conn);
4171 * Handle decrementing session or connection usage count if
4172 * a logout response was not able to be sent because the
4173 * connection failed. Fall back to Session Recovery here.
4175 if (atomic_read(&conn->conn_logout_remove)) {
4176 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4177 iscsit_dec_conn_usage_count(conn);
4178 iscsit_dec_session_usage_count(sess);
4180 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4181 iscsit_dec_conn_usage_count(conn);
4183 atomic_set(&conn->conn_logout_remove, 0);
4184 atomic_set(&sess->session_reinstatement, 0);
4185 atomic_set(&sess->session_fall_back_to_erl0, 1);
4188 spin_lock_bh(&sess->conn_lock);
4189 list_del(&conn->conn_list);
4192 * Attempt to let the Initiator know this connection failed by
4193 * sending an Connection Dropped Async Message on another
4194 * active connection.
4196 if (atomic_read(&conn->connection_recovery))
4197 iscsit_build_conn_drop_async_message(conn);
4199 spin_unlock_bh(&sess->conn_lock);
4202 * If connection reinstatement is being performed on this connection,
4203 * up the connection reinstatement semaphore that is being blocked on
4204 * in iscsit_cause_connection_reinstatement().
4206 spin_lock_bh(&conn->state_lock);
4207 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4208 spin_unlock_bh(&conn->state_lock);
4209 complete(&conn->conn_wait_comp);
4210 wait_for_completion(&conn->conn_post_wait_comp);
4211 spin_lock_bh(&conn->state_lock);
4215 * If connection reinstatement is being performed on this connection
4216 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4217 * connection wait rcfr semaphore that is being blocked on
4218 * an iscsit_connection_reinstatement_rcfr().
4220 if (atomic_read(&conn->connection_wait_rcfr)) {
4221 spin_unlock_bh(&conn->state_lock);
4222 complete(&conn->conn_wait_rcfr_comp);
4223 wait_for_completion(&conn->conn_post_wait_comp);
4224 spin_lock_bh(&conn->state_lock);
4226 atomic_set(&conn->connection_reinstatement, 1);
4227 spin_unlock_bh(&conn->state_lock);
4230 * If any other processes are accessing this connection pointer we
4231 * must wait until they have completed.
4233 iscsit_check_conn_usage_count(conn);
4235 ahash_request_free(conn->conn_tx_hash);
4236 if (conn->conn_rx_hash) {
4237 struct crypto_ahash *tfm;
4239 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4240 ahash_request_free(conn->conn_rx_hash);
4241 crypto_free_ahash(tfm);
4244 free_cpumask_var(conn->conn_cpumask);
4246 kfree(conn->conn_ops);
4247 conn->conn_ops = NULL;
4250 sock_release(conn->sock);
4252 if (conn->conn_transport->iscsit_free_conn)
4253 conn->conn_transport->iscsit_free_conn(conn);
4255 iscsit_put_transport(conn->conn_transport);
4257 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4258 conn->conn_state = TARG_CONN_STATE_FREE;
4261 spin_lock_bh(&sess->conn_lock);
4262 atomic_dec(&sess->nconn);
4263 pr_debug("Decremented iSCSI connection count to %hu from node:"
4264 " %s\n", atomic_read(&sess->nconn),
4265 sess->sess_ops->InitiatorName);
4267 * Make sure that if one connection fails in an non ERL=2 iSCSI
4268 * Session that they all fail.
4270 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4271 !atomic_read(&sess->session_logout))
4272 atomic_set(&sess->session_fall_back_to_erl0, 1);
4275 * If this was not the last connection in the session, and we are
4276 * performing session reinstatement or falling back to ERL=0, call
4277 * iscsit_stop_session() without sleeping to shutdown the other
4278 * active connections.
4280 if (atomic_read(&sess->nconn)) {
4281 if (!atomic_read(&sess->session_reinstatement) &&
4282 !atomic_read(&sess->session_fall_back_to_erl0)) {
4283 spin_unlock_bh(&sess->conn_lock);
4286 if (!atomic_read(&sess->session_stop_active)) {
4287 atomic_set(&sess->session_stop_active, 1);
4288 spin_unlock_bh(&sess->conn_lock);
4289 iscsit_stop_session(sess, 0, 0);
4292 spin_unlock_bh(&sess->conn_lock);
4297 * If this was the last connection in the session and one of the
4298 * following is occurring:
4300 * Session Reinstatement is not being performed, and are falling back
4301 * to ERL=0 call iscsit_close_session().
4303 * Session Logout was requested. iscsit_close_session() will be called
4306 * Session Continuation is not being performed, start the Time2Retain
4307 * handler and check if sleep_on_sess_wait_sem is active.
4309 if (!atomic_read(&sess->session_reinstatement) &&
4310 atomic_read(&sess->session_fall_back_to_erl0)) {
4311 spin_unlock_bh(&sess->conn_lock);
4312 iscsit_close_session(sess);
4315 } else if (atomic_read(&sess->session_logout)) {
4316 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4317 sess->session_state = TARG_SESS_STATE_FREE;
4318 spin_unlock_bh(&sess->conn_lock);
4320 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4321 complete(&sess->session_wait_comp);
4325 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4326 sess->session_state = TARG_SESS_STATE_FAILED;
4328 if (!atomic_read(&sess->session_continuation)) {
4329 spin_unlock_bh(&sess->conn_lock);
4330 iscsit_start_time2retain_handler(sess);
4332 spin_unlock_bh(&sess->conn_lock);
4334 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4335 complete(&sess->session_wait_comp);
4342 * If the iSCSI Session for the iSCSI Initiator Node exists,
4343 * forcefully shutdown the iSCSI NEXUS.
4345 int iscsit_close_session(struct iscsi_session *sess)
4347 struct iscsi_portal_group *tpg = sess->tpg;
4348 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4350 if (atomic_read(&sess->nconn)) {
4351 pr_err("%d connection(s) still exist for iSCSI session"
4352 " to %s\n", atomic_read(&sess->nconn),
4353 sess->sess_ops->InitiatorName);
4357 spin_lock_bh(&se_tpg->session_lock);
4358 atomic_set(&sess->session_logout, 1);
4359 atomic_set(&sess->session_reinstatement, 1);
4360 iscsit_stop_time2retain_timer(sess);
4361 spin_unlock_bh(&se_tpg->session_lock);
4364 * transport_deregister_session_configfs() will clear the
4365 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4366 * can be setting it again with __transport_register_session() in
4367 * iscsi_post_login_handler() again after the iscsit_stop_session()
4368 * completes in iscsi_np context.
4370 transport_deregister_session_configfs(sess->se_sess);
4373 * If any other processes are accessing this session pointer we must
4374 * wait until they have completed. If we are in an interrupt (the
4375 * time2retain handler) and contain and active session usage count we
4376 * restart the timer and exit.
4378 if (!in_interrupt()) {
4379 if (iscsit_check_session_usage_count(sess) == 1)
4380 iscsit_stop_session(sess, 1, 1);
4382 if (iscsit_check_session_usage_count(sess) == 2) {
4383 atomic_set(&sess->session_logout, 0);
4384 iscsit_start_time2retain_handler(sess);
4389 transport_deregister_session(sess->se_sess);
4391 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4392 iscsit_free_connection_recovery_entires(sess);
4394 iscsit_free_all_ooo_cmdsns(sess);
4396 spin_lock_bh(&se_tpg->session_lock);
4397 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4398 sess->session_state = TARG_SESS_STATE_FREE;
4399 pr_debug("Released iSCSI session from node: %s\n",
4400 sess->sess_ops->InitiatorName);
4403 tpg->tpg_tiqn->tiqn_nsessions--;
4405 pr_debug("Decremented number of active iSCSI Sessions on"
4406 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4408 spin_lock(&sess_idr_lock);
4409 idr_remove(&sess_idr, sess->session_index);
4410 spin_unlock(&sess_idr_lock);
4412 kfree(sess->sess_ops);
4413 sess->sess_ops = NULL;
4414 spin_unlock_bh(&se_tpg->session_lock);
4420 static void iscsit_logout_post_handler_closesession(
4421 struct iscsi_conn *conn)
4423 struct iscsi_session *sess = conn->sess;
4426 * Traditional iscsi/tcp will invoke this logic from TX thread
4427 * context during session logout, so clear tx_thread_active and
4428 * sleep if iscsit_close_connection() has not already occured.
4430 * Since iser-target invokes this logic from it's own workqueue,
4431 * always sleep waiting for RX/TX thread shutdown to complete
4432 * within iscsit_close_connection().
4434 if (!conn->conn_transport->rdma_shutdown) {
4435 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4440 atomic_set(&conn->conn_logout_remove, 0);
4441 complete(&conn->conn_logout_comp);
4443 iscsit_dec_conn_usage_count(conn);
4444 iscsit_stop_session(sess, sleep, sleep);
4445 iscsit_dec_session_usage_count(sess);
4446 iscsit_close_session(sess);
4449 static void iscsit_logout_post_handler_samecid(
4450 struct iscsi_conn *conn)
4454 if (!conn->conn_transport->rdma_shutdown) {
4455 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4460 atomic_set(&conn->conn_logout_remove, 0);
4461 complete(&conn->conn_logout_comp);
4463 iscsit_cause_connection_reinstatement(conn, sleep);
4464 iscsit_dec_conn_usage_count(conn);
4467 static void iscsit_logout_post_handler_diffcid(
4468 struct iscsi_conn *conn,
4471 struct iscsi_conn *l_conn;
4472 struct iscsi_session *sess = conn->sess;
4473 bool conn_found = false;
4478 spin_lock_bh(&sess->conn_lock);
4479 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4480 if (l_conn->cid == cid) {
4481 iscsit_inc_conn_usage_count(l_conn);
4486 spin_unlock_bh(&sess->conn_lock);
4492 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4494 spin_lock_bh(&l_conn->state_lock);
4495 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4496 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4497 spin_unlock_bh(&l_conn->state_lock);
4499 iscsit_cause_connection_reinstatement(l_conn, 1);
4500 iscsit_dec_conn_usage_count(l_conn);
4504 * Return of 0 causes the TX thread to restart.
4506 int iscsit_logout_post_handler(
4507 struct iscsi_cmd *cmd,
4508 struct iscsi_conn *conn)
4512 switch (cmd->logout_reason) {
4513 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4514 switch (cmd->logout_response) {
4515 case ISCSI_LOGOUT_SUCCESS:
4516 case ISCSI_LOGOUT_CLEANUP_FAILED:
4518 iscsit_logout_post_handler_closesession(conn);
4523 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4524 if (conn->cid == cmd->logout_cid) {
4525 switch (cmd->logout_response) {
4526 case ISCSI_LOGOUT_SUCCESS:
4527 case ISCSI_LOGOUT_CLEANUP_FAILED:
4529 iscsit_logout_post_handler_samecid(conn);
4534 switch (cmd->logout_response) {
4535 case ISCSI_LOGOUT_SUCCESS:
4536 iscsit_logout_post_handler_diffcid(conn,
4539 case ISCSI_LOGOUT_CID_NOT_FOUND:
4540 case ISCSI_LOGOUT_CLEANUP_FAILED:
4547 case ISCSI_LOGOUT_REASON_RECOVERY:
4548 switch (cmd->logout_response) {
4549 case ISCSI_LOGOUT_SUCCESS:
4550 case ISCSI_LOGOUT_CID_NOT_FOUND:
4551 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4552 case ISCSI_LOGOUT_CLEANUP_FAILED:
4564 EXPORT_SYMBOL(iscsit_logout_post_handler);
4566 void iscsit_fail_session(struct iscsi_session *sess)
4568 struct iscsi_conn *conn;
4570 spin_lock_bh(&sess->conn_lock);
4571 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4572 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4573 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4575 spin_unlock_bh(&sess->conn_lock);
4577 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4578 sess->session_state = TARG_SESS_STATE_FAILED;
4581 int iscsit_free_session(struct iscsi_session *sess)
4583 u16 conn_count = atomic_read(&sess->nconn);
4584 struct iscsi_conn *conn, *conn_tmp = NULL;
4587 spin_lock_bh(&sess->conn_lock);
4588 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4590 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4592 if (conn_count == 0)
4595 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4598 iscsit_inc_conn_usage_count(conn_tmp);
4601 iscsit_inc_conn_usage_count(conn);
4603 spin_unlock_bh(&sess->conn_lock);
4604 iscsit_cause_connection_reinstatement(conn, 1);
4605 spin_lock_bh(&sess->conn_lock);
4607 iscsit_dec_conn_usage_count(conn);
4609 iscsit_dec_conn_usage_count(conn_tmp);
4614 if (atomic_read(&sess->nconn)) {
4615 spin_unlock_bh(&sess->conn_lock);
4616 wait_for_completion(&sess->session_wait_comp);
4618 spin_unlock_bh(&sess->conn_lock);
4620 iscsit_close_session(sess);
4624 void iscsit_stop_session(
4625 struct iscsi_session *sess,
4627 int connection_sleep)
4629 u16 conn_count = atomic_read(&sess->nconn);
4630 struct iscsi_conn *conn, *conn_tmp = NULL;
4633 spin_lock_bh(&sess->conn_lock);
4635 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4637 if (connection_sleep) {
4638 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4640 if (conn_count == 0)
4643 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4646 iscsit_inc_conn_usage_count(conn_tmp);
4649 iscsit_inc_conn_usage_count(conn);
4651 spin_unlock_bh(&sess->conn_lock);
4652 iscsit_cause_connection_reinstatement(conn, 1);
4653 spin_lock_bh(&sess->conn_lock);
4655 iscsit_dec_conn_usage_count(conn);
4657 iscsit_dec_conn_usage_count(conn_tmp);
4661 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4662 iscsit_cause_connection_reinstatement(conn, 0);
4665 if (session_sleep && atomic_read(&sess->nconn)) {
4666 spin_unlock_bh(&sess->conn_lock);
4667 wait_for_completion(&sess->session_wait_comp);
4669 spin_unlock_bh(&sess->conn_lock);
4672 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4674 struct iscsi_session *sess;
4675 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4676 struct se_session *se_sess, *se_sess_tmp;
4677 LIST_HEAD(free_list);
4678 int session_count = 0;
4680 spin_lock_bh(&se_tpg->session_lock);
4681 if (tpg->nsessions && !force) {
4682 spin_unlock_bh(&se_tpg->session_lock);
4686 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4688 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4690 spin_lock(&sess->conn_lock);
4691 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4692 atomic_read(&sess->session_logout) ||
4693 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4694 spin_unlock(&sess->conn_lock);
4697 atomic_set(&sess->session_reinstatement, 1);
4698 atomic_set(&sess->session_fall_back_to_erl0, 1);
4699 spin_unlock(&sess->conn_lock);
4701 list_move_tail(&se_sess->sess_list, &free_list);
4703 spin_unlock_bh(&se_tpg->session_lock);
4705 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4706 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4708 iscsit_free_session(sess);
4712 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4713 " Group: %hu\n", session_count, tpg->tpgt);
4717 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4718 MODULE_VERSION("4.1.x");
4719 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4720 MODULE_LICENSE("GPL");
4722 module_init(iscsi_target_init_module);
4723 module_exit(iscsi_target_cleanup_module);