1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <linux/inet.h>
31 #include <scsi/scsi_proto.h>
32 #include <scsi/iscsi_proto.h>
33 #include <scsi/scsi_tcq.h>
34 #include <target/target_core_base.h>
35 #include <target/target_core_fabric.h>
37 #include <target/iscsi/iscsi_target_core.h>
38 #include "iscsi_target_parameters.h"
39 #include "iscsi_target_seq_pdu_list.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include <target/iscsi/iscsi_target_stat.h>
52 #include <target/iscsi/iscsi_transport.h>
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_MUTEX(np_lock);
59 static struct idr tiqn_idr;
61 struct mutex auth_id_lock;
63 struct iscsit_global *iscsit_global;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75 struct iscsi_tiqn *tiqn = NULL;
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
88 spin_unlock(&tiqn->tiqn_state_lock);
91 spin_unlock(&tiqn_lock);
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
104 spin_unlock(&tiqn->tiqn_state_lock);
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122 struct iscsi_tiqn *tiqn = NULL;
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
128 return ERR_PTR(-EINVAL);
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
133 return ERR_PTR(-ENOMEM);
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160 spin_unlock(&tiqn_lock);
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172 * Wait for accesses to said struct iscsi_tiqn to end.
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
178 spin_lock(&tiqn->tiqn_state_lock);
180 spin_unlock(&tiqn->tiqn_state_lock);
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
196 iscsit_wait_for_tiqn(tiqn);
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
212 * Determine if the network portal is accepting storage traffic.
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
219 spin_unlock_bh(&np->np_thread_lock);
221 * Determine if the portal group is accepting storage traffic.
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
228 spin_unlock_bh(&tpg->tpg_state_lock);
231 * Here we serialize access across the TIQN+TPG Tuple.
233 ret = down_interruptible(&tpg->np_login_sem);
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
243 spin_unlock_bh(&tpg->tpg_state_lock);
248 void iscsit_login_kref_put(struct kref *kref)
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
253 complete(&tpg_np->tpg_np_comp);
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261 up(&tpg->np_login_sem);
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
267 iscsit_put_tiqn_for_login(tiqn);
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
275 int network_transport)
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->sin6_port);
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
312 * Called with mutex np_lock held
314 static struct iscsi_np *iscsit_get_np(
315 struct sockaddr_storage *sockaddr,
316 int network_transport)
321 list_for_each_entry(np, &g_np_list, np_list) {
322 spin_lock_bh(&np->np_thread_lock);
323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324 spin_unlock_bh(&np->np_thread_lock);
328 match = iscsit_check_np_match(sockaddr, np, network_transport);
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
336 spin_unlock_bh(&np->np_thread_lock);
339 spin_unlock_bh(&np->np_thread_lock);
345 struct iscsi_np *iscsit_add_np(
346 struct sockaddr_storage *sockaddr,
347 int network_transport)
352 mutex_lock(&np_lock);
355 * Locate the existing struct iscsi_np if already active..
357 np = iscsit_get_np(sockaddr, network_transport);
359 mutex_unlock(&np_lock);
363 np = kzalloc(sizeof(*np), GFP_KERNEL);
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
375 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
377 ret = iscsi_target_setup_login_socket(np, sockaddr);
380 mutex_unlock(&np_lock);
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
389 mutex_unlock(&np_lock);
393 * Increment the np_exports reference count now to prevent
394 * iscsit_del_np() below from being run while a new call to
395 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
396 * active. We don't need to hold np->np_thread_lock at this
397 * point because iscsi_np has not been added to g_np_list yet.
400 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
402 list_add_tail(&np->np_list, &g_np_list);
403 mutex_unlock(&np_lock);
405 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
406 &np->np_sockaddr, np->np_transport->name);
411 int iscsit_reset_np_thread(
413 struct iscsi_tpg_np *tpg_np,
414 struct iscsi_portal_group *tpg,
417 spin_lock_bh(&np->np_thread_lock);
418 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
419 spin_unlock_bh(&np->np_thread_lock);
422 np->np_thread_state = ISCSI_NP_THREAD_RESET;
423 atomic_inc(&np->np_reset_count);
426 spin_unlock_bh(&np->np_thread_lock);
427 send_sig(SIGINT, np->np_thread, 1);
428 wait_for_completion(&np->np_restart_comp);
429 spin_lock_bh(&np->np_thread_lock);
431 spin_unlock_bh(&np->np_thread_lock);
433 if (tpg_np && shutdown) {
434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
436 wait_for_completion(&tpg_np->tpg_np_comp);
442 static void iscsit_free_np(struct iscsi_np *np)
445 sock_release(np->np_socket);
448 int iscsit_del_np(struct iscsi_np *np)
450 spin_lock_bh(&np->np_thread_lock);
452 if (np->np_exports) {
454 spin_unlock_bh(&np->np_thread_lock);
457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
458 spin_unlock_bh(&np->np_thread_lock);
462 * We need to send the signal to wakeup Linux/Net
463 * which may be sleeping in sock_accept()..
465 send_sig(SIGINT, np->np_thread, 1);
466 kthread_stop(np->np_thread);
467 np->np_thread = NULL;
470 np->np_transport->iscsit_free_np(np);
472 mutex_lock(&np_lock);
473 list_del(&np->np_list);
474 mutex_unlock(&np_lock);
476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
477 &np->np_sockaddr, np->np_transport->name);
479 iscsit_put_transport(np->np_transport);
484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
488 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
490 EXPORT_SYMBOL(iscsit_queue_rsp);
492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node))
496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
499 __iscsit_free_cmd(cmd, true);
501 EXPORT_SYMBOL(iscsit_aborted_task);
503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
504 u32, u32, const void *, void *);
505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
509 const void *data_buf, u32 data_buf_len)
511 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
516 iov = &cmd->iov_misc[0];
517 iov[niov].iov_base = cmd->pdu;
518 iov[niov++].iov_len = ISCSI_HDR_LEN;
520 if (conn->conn_ops->HeaderDigest) {
521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
524 ISCSI_HDR_LEN, 0, NULL,
527 iov[0].iov_len += ISCSI_CRC_LEN;
528 tx_size += ISCSI_CRC_LEN;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr->opcode, *header_digest);
535 u32 padding = ((-data_buf_len) & 3);
537 iov[niov].iov_base = (void *)data_buf;
538 iov[niov++].iov_len = data_buf_len;
539 tx_size += data_buf_len;
542 iov[niov].iov_base = &cmd->pad_bytes;
543 iov[niov++].iov_len = padding;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding);
549 if (conn->conn_ops->DataDigest) {
550 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
551 data_buf, data_buf_len,
552 padding, &cmd->pad_bytes,
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,
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);
703 ret = target_register_template(&iscsi_ops);
707 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
708 iscsit_global->ts_bitmap = vzalloc(size);
709 if (!iscsit_global->ts_bitmap)
712 lio_qr_cache = kmem_cache_create("lio_qr_cache",
713 sizeof(struct iscsi_queue_req),
714 __alignof__(struct iscsi_queue_req), 0, NULL);
716 pr_err("nable to kmem_cache_create() for"
721 lio_dr_cache = kmem_cache_create("lio_dr_cache",
722 sizeof(struct iscsi_datain_req),
723 __alignof__(struct iscsi_datain_req), 0, NULL);
725 pr_err("Unable to kmem_cache_create() for"
730 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
731 sizeof(struct iscsi_ooo_cmdsn),
732 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
733 if (!lio_ooo_cache) {
734 pr_err("Unable to kmem_cache_create() for"
739 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
740 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
742 if (!lio_r2t_cache) {
743 pr_err("Unable to kmem_cache_create() for"
748 iscsit_register_transport(&iscsi_target_transport);
750 if (iscsit_load_discovery_tpg() < 0)
755 iscsit_unregister_transport(&iscsi_target_transport);
756 kmem_cache_destroy(lio_r2t_cache);
758 kmem_cache_destroy(lio_ooo_cache);
760 kmem_cache_destroy(lio_dr_cache);
762 kmem_cache_destroy(lio_qr_cache);
764 vfree(iscsit_global->ts_bitmap);
766 /* XXX: this probably wants it to be it's own unwind step.. */
767 if (iscsit_global->discovery_tpg)
768 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
769 target_unregister_template(&iscsi_ops);
771 kfree(iscsit_global);
775 static void __exit iscsi_target_cleanup_module(void)
777 iscsit_release_discovery_tpg();
778 iscsit_unregister_transport(&iscsi_target_transport);
779 kmem_cache_destroy(lio_qr_cache);
780 kmem_cache_destroy(lio_dr_cache);
781 kmem_cache_destroy(lio_ooo_cache);
782 kmem_cache_destroy(lio_r2t_cache);
785 * Shutdown discovery sessions and disable discovery TPG
787 if (iscsit_global->discovery_tpg)
788 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
790 target_unregister_template(&iscsi_ops);
792 vfree(iscsit_global->ts_bitmap);
793 kfree(iscsit_global);
796 int iscsit_add_reject(
797 struct iscsi_conn *conn,
801 struct iscsi_cmd *cmd;
803 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
807 cmd->iscsi_opcode = ISCSI_OP_REJECT;
808 cmd->reject_reason = reason;
810 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
812 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
813 iscsit_free_cmd(cmd, false);
817 spin_lock_bh(&conn->cmd_lock);
818 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
819 spin_unlock_bh(&conn->cmd_lock);
821 cmd->i_state = ISTATE_SEND_REJECT;
822 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
826 EXPORT_SYMBOL(iscsit_add_reject);
828 static int iscsit_add_reject_from_cmd(
829 struct iscsi_cmd *cmd,
834 struct iscsi_conn *conn;
835 const bool do_put = cmd->se_cmd.se_tfo != NULL;
838 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
844 cmd->iscsi_opcode = ISCSI_OP_REJECT;
845 cmd->reject_reason = reason;
847 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
849 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
850 iscsit_free_cmd(cmd, false);
855 spin_lock_bh(&conn->cmd_lock);
856 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
857 spin_unlock_bh(&conn->cmd_lock);
860 cmd->i_state = ISTATE_SEND_REJECT;
861 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
863 * Perform the kref_put now if se_cmd has already been setup by
864 * scsit_setup_scsi_cmd()
867 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
868 target_put_sess_cmd(&cmd->se_cmd);
873 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
876 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
879 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
881 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
883 EXPORT_SYMBOL(iscsit_reject_cmd);
886 * Map some portion of the allocated scatterlist to an iovec, suitable for
887 * kernel sockets to copy data in/out.
889 static int iscsit_map_iovec(
890 struct iscsi_cmd *cmd,
896 struct scatterlist *sg;
897 unsigned int page_off;
900 * We know each entry in t_data_sg contains a page.
902 u32 ent = data_offset / PAGE_SIZE;
904 if (ent >= cmd->se_cmd.t_data_nents) {
905 pr_err("Initial page entry out-of-bounds\n");
909 sg = &cmd->se_cmd.t_data_sg[ent];
910 page_off = (data_offset % PAGE_SIZE);
912 cmd->first_data_sg = sg;
913 cmd->first_data_sg_off = page_off;
915 while (data_length) {
916 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
918 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
919 iov[i].iov_len = cur_len;
921 data_length -= cur_len;
927 cmd->kmapped_nents = i;
932 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
935 struct scatterlist *sg;
937 sg = cmd->first_data_sg;
939 for (i = 0; i < cmd->kmapped_nents; i++)
940 kunmap(sg_page(&sg[i]));
943 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
946 struct iscsi_cmd *cmd, *cmd_p;
948 conn->exp_statsn = exp_statsn;
950 if (conn->sess->sess_ops->RDMAExtensions)
953 spin_lock_bh(&conn->cmd_lock);
954 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
955 spin_lock(&cmd->istate_lock);
956 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
957 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
958 cmd->i_state = ISTATE_REMOVE;
959 spin_unlock(&cmd->istate_lock);
960 list_move_tail(&cmd->i_conn_node, &ack_list);
963 spin_unlock(&cmd->istate_lock);
965 spin_unlock_bh(&conn->cmd_lock);
967 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
968 list_del_init(&cmd->i_conn_node);
969 iscsit_free_cmd(cmd, false);
973 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
975 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
977 iov_count += ISCSI_IOV_DATA_BUFFER;
978 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
982 cmd->orig_iov_data_count = iov_count;
986 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
989 int data_direction, payload_length;
990 struct iscsi_scsi_req *hdr;
994 atomic_long_inc(&conn->sess->cmd_pdus);
996 hdr = (struct iscsi_scsi_req *) buf;
997 payload_length = ntoh24(hdr->dlength);
999 /* FIXME; Add checks for AdditionalHeaderSegment */
1001 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1002 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1003 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1004 " not set. Bad iSCSI Initiator.\n");
1005 return iscsit_add_reject_cmd(cmd,
1006 ISCSI_REASON_BOOKMARK_INVALID, buf);
1009 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1010 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1012 * From RFC-3720 Section 10.3.1:
1014 * "Either or both of R and W MAY be 1 when either the
1015 * Expected Data Transfer Length and/or Bidirectional Read
1016 * Expected Data Transfer Length are 0"
1018 * For this case, go ahead and clear the unnecssary bits
1019 * to avoid any confusion with ->data_direction.
1021 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1022 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1024 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1025 " set when Expected Data Transfer Length is 0 for"
1026 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1029 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1030 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1031 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1032 " MUST be set if Expected Data Transfer Length is not 0."
1033 " Bad iSCSI Initiator\n");
1034 return iscsit_add_reject_cmd(cmd,
1035 ISCSI_REASON_BOOKMARK_INVALID, buf);
1038 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1040 pr_err("Bidirectional operations not supported!\n");
1041 return iscsit_add_reject_cmd(cmd,
1042 ISCSI_REASON_BOOKMARK_INVALID, buf);
1045 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1046 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1047 " Scsi Command PDU.\n");
1048 return iscsit_add_reject_cmd(cmd,
1049 ISCSI_REASON_BOOKMARK_INVALID, buf);
1052 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1053 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1054 " protocol error.\n", payload_length);
1055 return iscsit_add_reject_cmd(cmd,
1056 ISCSI_REASON_PROTOCOL_ERROR, buf);
1059 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1060 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1061 pr_err("Expected Data Transfer Length and Length of"
1062 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1063 " bit is not set protocol error\n");
1064 return iscsit_add_reject_cmd(cmd,
1065 ISCSI_REASON_PROTOCOL_ERROR, buf);
1068 if (payload_length > be32_to_cpu(hdr->data_length)) {
1069 pr_err("DataSegmentLength: %u is greater than"
1070 " EDTL: %u, protocol error.\n", payload_length,
1072 return iscsit_add_reject_cmd(cmd,
1073 ISCSI_REASON_PROTOCOL_ERROR, buf);
1076 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1077 pr_err("DataSegmentLength: %u is greater than"
1078 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1079 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1080 return iscsit_add_reject_cmd(cmd,
1081 ISCSI_REASON_PROTOCOL_ERROR, buf);
1084 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1085 pr_err("DataSegmentLength: %u is greater than"
1086 " FirstBurstLength: %u, protocol error.\n",
1087 payload_length, conn->sess->sess_ops->FirstBurstLength);
1088 return iscsit_add_reject_cmd(cmd,
1089 ISCSI_REASON_BOOKMARK_INVALID, buf);
1092 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1093 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1096 cmd->data_direction = data_direction;
1097 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1099 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1101 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1102 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1103 sam_task_attr = TCM_SIMPLE_TAG;
1104 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1105 sam_task_attr = TCM_ORDERED_TAG;
1106 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1107 sam_task_attr = TCM_HEAD_TAG;
1108 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1109 sam_task_attr = TCM_ACA_TAG;
1111 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1112 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1113 sam_task_attr = TCM_SIMPLE_TAG;
1116 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1117 cmd->i_state = ISTATE_NEW_CMD;
1118 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1119 cmd->immediate_data = (payload_length) ? 1 : 0;
1120 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1121 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1122 if (cmd->unsolicited_data)
1123 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1125 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1126 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1127 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1129 cmd->targ_xfer_tag = 0xFFFFFFFF;
1130 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1131 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1132 cmd->first_burst_len = payload_length;
1134 if (!conn->sess->sess_ops->RDMAExtensions &&
1135 cmd->data_direction == DMA_FROM_DEVICE) {
1136 struct iscsi_datain_req *dr;
1138 dr = iscsit_allocate_datain_req();
1140 return iscsit_add_reject_cmd(cmd,
1141 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1143 iscsit_attach_datain_req(cmd, dr);
1147 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1149 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1150 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1151 cmd->data_direction, sam_task_attr,
1152 cmd->sense_buffer + 2);
1154 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1155 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1156 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1159 target_get_sess_cmd(&cmd->se_cmd, true);
1161 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1162 scsilun_to_int(&hdr->lun));
1163 if (cmd->sense_reason)
1166 /* only used for printks or comparing with ->ref_task_tag */
1167 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1168 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1169 if (cmd->sense_reason) {
1170 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1171 return iscsit_add_reject_cmd(cmd,
1172 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1178 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1179 return iscsit_add_reject_cmd(cmd,
1180 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184 spin_lock_bh(&conn->cmd_lock);
1185 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1186 spin_unlock_bh(&conn->cmd_lock);
1188 * Check if we need to delay processing because of ALUA
1189 * Active/NonOptimized primary access state..
1191 core_alua_check_nonop_delay(&cmd->se_cmd);
1195 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1197 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1199 iscsit_set_dataout_sequence_values(cmd);
1201 spin_lock_bh(&cmd->dataout_timeout_lock);
1202 iscsit_start_dataout_timer(cmd, cmd->conn);
1203 spin_unlock_bh(&cmd->dataout_timeout_lock);
1205 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1207 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1208 struct iscsi_scsi_req *hdr)
1212 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1213 * the Immediate Bit is not set, and no Immediate
1216 * A PDU/CmdSN carrying Immediate Data can only
1217 * be processed after the DataCRC has passed.
1218 * If the DataCRC fails, the CmdSN MUST NOT
1219 * be acknowledged. (See below)
1221 if (!cmd->immediate_data) {
1222 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1223 (unsigned char *)hdr, hdr->cmdsn);
1224 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1226 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1227 target_put_sess_cmd(&cmd->se_cmd);
1232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1235 * If no Immediate Data is attached, it's OK to return now.
1237 if (!cmd->immediate_data) {
1238 if (!cmd->sense_reason && cmd->unsolicited_data)
1239 iscsit_set_unsoliticed_dataout(cmd);
1240 if (!cmd->sense_reason)
1243 target_put_sess_cmd(&cmd->se_cmd);
1248 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1249 * execution. These exceptions are processed in CmdSN order using
1250 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1252 if (cmd->sense_reason)
1255 * Call directly into transport_generic_new_cmd() to perform
1256 * the backend memory allocation.
1258 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1259 if (cmd->sense_reason)
1264 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1267 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1270 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1272 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1275 goto after_immediate_data;
1277 * Check for underflow case where both EDTL and immediate data payload
1278 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1279 * already been set in target_cmd_size_check() as se_cmd->data_length.
1281 * For this special case, fail the command and dump the immediate data
1284 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1285 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1286 goto after_immediate_data;
1289 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1290 cmd->first_burst_len);
1291 after_immediate_data:
1292 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1294 * A PDU/CmdSN carrying Immediate Data passed
1295 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1296 * Immediate Bit is not set.
1298 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1299 (unsigned char *)hdr, hdr->cmdsn);
1300 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1303 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1306 rc = iscsit_dump_data_payload(cmd->conn,
1307 cmd->first_burst_len, 1);
1308 target_put_sess_cmd(&cmd->se_cmd);
1310 } else if (cmd->unsolicited_data)
1311 iscsit_set_unsoliticed_dataout(cmd);
1313 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1315 * Immediate Data failed DataCRC and ERL>=1,
1316 * silently drop this PDU and let the initiator
1317 * plug the CmdSN gap.
1319 * FIXME: Send Unsolicited NOPIN with reserved
1320 * TTT here to help the initiator figure out
1321 * the missing CmdSN, although they should be
1322 * intelligent enough to determine the missing
1323 * CmdSN and issue a retry to plug the sequence.
1325 cmd->i_state = ISTATE_REMOVE;
1326 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1327 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1334 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1337 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1339 bool dump_payload = false;
1341 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1345 * Allocation iovecs needed for struct socket operations for
1346 * traditional iSCSI block I/O.
1348 if (iscsit_allocate_iovecs(cmd) < 0) {
1349 return iscsit_reject_cmd(cmd,
1350 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1352 immed_data = cmd->immediate_data;
1354 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1358 dump_payload = true;
1363 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1366 static u32 iscsit_do_crypto_hash_sg(
1367 struct ahash_request *hash,
1368 struct iscsi_cmd *cmd,
1375 struct scatterlist *sg;
1376 unsigned int page_off;
1378 crypto_ahash_init(hash);
1380 sg = cmd->first_data_sg;
1381 page_off = cmd->first_data_sg_off;
1383 if (data_length && page_off) {
1384 struct scatterlist first_sg;
1385 u32 len = min_t(u32, data_length, sg->length - page_off);
1387 sg_init_table(&first_sg, 1);
1388 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1390 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1391 crypto_ahash_update(hash);
1397 while (data_length) {
1398 u32 cur_len = min_t(u32, data_length, sg->length);
1400 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1401 crypto_ahash_update(hash);
1403 data_length -= cur_len;
1404 /* iscsit_map_iovec has already checked for invalid sg pointers */
1409 struct scatterlist pad_sg;
1411 sg_init_one(&pad_sg, pad_bytes, padding);
1412 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1414 crypto_ahash_finup(hash);
1416 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1417 crypto_ahash_final(hash);
1423 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1424 const void *buf, u32 payload_length, u32 padding,
1425 const void *pad_bytes, void *data_crc)
1427 struct scatterlist sg[2];
1429 sg_init_table(sg, ARRAY_SIZE(sg));
1430 sg_set_buf(sg, buf, payload_length);
1432 sg_set_buf(sg + 1, pad_bytes, padding);
1434 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1436 crypto_ahash_digest(hash);
1440 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1441 struct iscsi_cmd *cmd, u32 payload_length,
1444 struct iscsi_data *hdr = buf;
1445 struct se_cmd *se_cmd;
1449 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1451 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1452 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1453 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1454 payload_length, conn->cid);
1456 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1457 pr_err("Command ITT: 0x%08x received DataOUT after"
1458 " last DataOUT received, dumping payload\n",
1459 cmd->init_task_tag);
1460 return iscsit_dump_data_payload(conn, payload_length, 1);
1463 if (cmd->data_direction != DMA_TO_DEVICE) {
1464 pr_err("Command ITT: 0x%08x received DataOUT for a"
1465 " NON-WRITE command.\n", cmd->init_task_tag);
1466 return iscsit_dump_data_payload(conn, payload_length, 1);
1468 se_cmd = &cmd->se_cmd;
1469 iscsit_mod_dataout_timer(cmd);
1471 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1472 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1473 be32_to_cpu(hdr->offset), payload_length,
1474 cmd->se_cmd.data_length);
1475 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1478 if (cmd->unsolicited_data) {
1479 int dump_unsolicited_data = 0;
1481 if (conn->sess->sess_ops->InitialR2T) {
1482 pr_err("Received unexpected unsolicited data"
1483 " while InitialR2T=Yes, protocol error.\n");
1484 transport_send_check_condition_and_sense(&cmd->se_cmd,
1485 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1489 * Special case for dealing with Unsolicited DataOUT
1490 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1494 /* Something's amiss if we're not in WRITE_PENDING state... */
1495 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1496 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1497 dump_unsolicited_data = 1;
1499 if (dump_unsolicited_data) {
1501 * Check if a delayed TASK_ABORTED status needs to
1502 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1503 * received with the unsolicited data out.
1505 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1506 iscsit_stop_dataout_timer(cmd);
1508 transport_check_aborted_status(se_cmd,
1509 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1510 return iscsit_dump_data_payload(conn, payload_length, 1);
1514 * For the normal solicited data path:
1516 * Check for a delayed TASK_ABORTED status and dump any
1517 * incoming data out payload if one exists. Also, when the
1518 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1519 * data out sequence, we decrement outstanding_r2ts. Once
1520 * outstanding_r2ts reaches zero, go ahead and send the delayed
1521 * TASK_ABORTED status.
1523 if (se_cmd->transport_state & CMD_T_ABORTED) {
1524 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1525 if (--cmd->outstanding_r2ts < 1) {
1526 iscsit_stop_dataout_timer(cmd);
1527 transport_check_aborted_status(
1531 return iscsit_dump_data_payload(conn, payload_length, 1);
1535 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1536 * within-command recovery checks before receiving the payload.
1538 rc = iscsit_check_pre_dataout(cmd, buf);
1539 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1541 else if (rc == DATAOUT_CANNOT_RECOVER)
1546 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1549 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1550 struct iscsi_cmd **out_cmd)
1552 struct iscsi_data *hdr = buf;
1553 struct iscsi_cmd *cmd;
1554 u32 payload_length = ntoh24(hdr->dlength);
1556 bool success = false;
1558 if (!payload_length) {
1559 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1563 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1564 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1565 " MaxXmitDataSegmentLength: %u\n", payload_length,
1566 conn->conn_ops->MaxXmitDataSegmentLength);
1567 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1570 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1574 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1581 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1584 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1585 struct iscsi_data *hdr)
1588 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1589 u32 payload_length = ntoh24(hdr->dlength);
1590 int iov_ret, data_crc_failed = 0;
1592 rx_size += payload_length;
1593 iov = &cmd->iov_data[0];
1595 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1600 iov_count += iov_ret;
1602 padding = ((-payload_length) & 3);
1604 iov[iov_count].iov_base = cmd->pad_bytes;
1605 iov[iov_count++].iov_len = padding;
1607 pr_debug("Receiving %u padding bytes.\n", padding);
1610 if (conn->conn_ops->DataDigest) {
1611 iov[iov_count].iov_base = &checksum;
1612 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1613 rx_size += ISCSI_CRC_LEN;
1616 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1618 iscsit_unmap_iovec(cmd);
1620 if (rx_got != rx_size)
1623 if (conn->conn_ops->DataDigest) {
1626 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1627 be32_to_cpu(hdr->offset),
1628 payload_length, padding,
1631 if (checksum != data_crc) {
1632 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1633 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1634 " does not match computed 0x%08x\n",
1635 hdr->itt, hdr->offset, payload_length,
1636 hdr->datasn, checksum, data_crc);
1637 data_crc_failed = 1;
1639 pr_debug("Got CRC32C DataDigest 0x%08x for"
1640 " %u bytes of Data Out\n", checksum,
1645 return data_crc_failed;
1649 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1650 bool data_crc_failed)
1652 struct iscsi_conn *conn = cmd->conn;
1655 * Increment post receive data and CRC values or perform
1656 * within-command recovery.
1658 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1659 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1661 else if (rc == DATAOUT_SEND_R2T) {
1662 iscsit_set_dataout_sequence_values(cmd);
1663 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1664 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1666 * Handle extra special case for out of order
1667 * Unsolicited Data Out.
1669 spin_lock_bh(&cmd->istate_lock);
1670 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1671 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1672 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1673 spin_unlock_bh(&cmd->istate_lock);
1675 iscsit_stop_dataout_timer(cmd);
1678 target_execute_cmd(&cmd->se_cmd);
1680 } else /* DATAOUT_CANNOT_RECOVER */
1685 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1687 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1689 struct iscsi_cmd *cmd = NULL;
1690 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1692 bool data_crc_failed = false;
1694 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1700 rc = iscsit_get_dataout(conn, cmd, hdr);
1704 data_crc_failed = true;
1706 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1709 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1710 struct iscsi_nopout *hdr)
1712 u32 payload_length = ntoh24(hdr->dlength);
1714 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1715 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1717 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1718 (unsigned char *)hdr);
1720 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1721 (unsigned char *)hdr);
1724 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1725 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1726 " not set, protocol error.\n");
1728 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1729 (unsigned char *)hdr);
1731 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1732 (unsigned char *)hdr);
1735 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1736 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1737 " greater than MaxXmitDataSegmentLength: %u, protocol"
1738 " error.\n", payload_length,
1739 conn->conn_ops->MaxXmitDataSegmentLength);
1741 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1742 (unsigned char *)hdr);
1744 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1745 (unsigned char *)hdr);
1748 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1749 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1750 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1751 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1754 * This is not a response to a Unsolicited NopIN, which means
1755 * it can either be a NOPOUT ping request (with a valid ITT),
1756 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1757 * Either way, make sure we allocate an struct iscsi_cmd, as both
1758 * can contain ping data.
1760 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1761 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1762 cmd->i_state = ISTATE_SEND_NOPIN;
1763 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1765 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1766 cmd->targ_xfer_tag = 0xFFFFFFFF;
1767 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1768 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1769 cmd->data_direction = DMA_NONE;
1774 EXPORT_SYMBOL(iscsit_setup_nop_out);
1776 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1777 struct iscsi_nopout *hdr)
1779 struct iscsi_cmd *cmd_p = NULL;
1782 * Initiator is expecting a NopIN ping reply..
1784 if (hdr->itt != RESERVED_ITT) {
1786 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1787 (unsigned char *)hdr);
1789 spin_lock_bh(&conn->cmd_lock);
1790 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1791 spin_unlock_bh(&conn->cmd_lock);
1793 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1795 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1796 iscsit_add_cmd_to_response_queue(cmd, conn,
1801 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1802 (unsigned char *)hdr, hdr->cmdsn);
1803 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1805 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1811 * This was a response to a unsolicited NOPIN ping.
1813 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1814 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1818 iscsit_stop_nopin_response_timer(conn);
1820 cmd_p->i_state = ISTATE_REMOVE;
1821 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1823 iscsit_start_nopin_timer(conn);
1827 * Otherwise, initiator is not expecting a NOPIN is response.
1828 * Just ignore for now.
1832 iscsit_free_cmd(cmd, false);
1836 EXPORT_SYMBOL(iscsit_process_nop_out);
1838 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1841 unsigned char *ping_data = NULL;
1842 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1843 struct kvec *iov = NULL;
1844 u32 payload_length = ntoh24(hdr->dlength);
1847 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1851 * Handle NOP-OUT payload for traditional iSCSI sockets
1853 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1854 u32 checksum, data_crc, padding = 0;
1855 int niov = 0, rx_got, rx_size = payload_length;
1857 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1863 iov = &cmd->iov_misc[0];
1864 iov[niov].iov_base = ping_data;
1865 iov[niov++].iov_len = payload_length;
1867 padding = ((-payload_length) & 3);
1869 pr_debug("Receiving %u additional bytes"
1870 " for padding.\n", padding);
1871 iov[niov].iov_base = &cmd->pad_bytes;
1872 iov[niov++].iov_len = padding;
1875 if (conn->conn_ops->DataDigest) {
1876 iov[niov].iov_base = &checksum;
1877 iov[niov++].iov_len = ISCSI_CRC_LEN;
1878 rx_size += ISCSI_CRC_LEN;
1881 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1882 if (rx_got != rx_size) {
1887 if (conn->conn_ops->DataDigest) {
1888 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1889 payload_length, padding,
1890 cmd->pad_bytes, &data_crc);
1892 if (checksum != data_crc) {
1893 pr_err("Ping data CRC32C DataDigest"
1894 " 0x%08x does not match computed 0x%08x\n",
1895 checksum, data_crc);
1896 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1897 pr_err("Unable to recover from"
1898 " NOPOUT Ping DataCRC failure while in"
1904 * Silently drop this PDU and let the
1905 * initiator plug the CmdSN gap.
1907 pr_debug("Dropping NOPOUT"
1908 " Command CmdSN: 0x%08x due to"
1909 " DataCRC error.\n", hdr->cmdsn);
1914 pr_debug("Got CRC32C DataDigest"
1915 " 0x%08x for %u bytes of ping data.\n",
1916 checksum, payload_length);
1920 ping_data[payload_length] = '\0';
1922 * Attach ping data to struct iscsi_cmd->buf_ptr.
1924 cmd->buf_ptr = ping_data;
1925 cmd->buf_ptr_size = payload_length;
1927 pr_debug("Got %u bytes of NOPOUT ping"
1928 " data.\n", payload_length);
1929 pr_debug("Ping Data: \"%s\"\n", ping_data);
1932 return iscsit_process_nop_out(conn, cmd, hdr);
1935 iscsit_free_cmd(cmd, false);
1941 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1943 switch (iscsi_tmf) {
1944 case ISCSI_TM_FUNC_ABORT_TASK:
1945 return TMR_ABORT_TASK;
1946 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1947 return TMR_ABORT_TASK_SET;
1948 case ISCSI_TM_FUNC_CLEAR_ACA:
1949 return TMR_CLEAR_ACA;
1950 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1951 return TMR_CLEAR_TASK_SET;
1952 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1953 return TMR_LUN_RESET;
1954 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1955 return TMR_TARGET_WARM_RESET;
1956 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1957 return TMR_TARGET_COLD_RESET;
1964 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967 struct se_tmr_req *se_tmr;
1968 struct iscsi_tmr_req *tmr_req;
1969 struct iscsi_tm *hdr;
1970 int out_of_order_cmdsn = 0, ret;
1971 u8 function, tcm_function = TMR_UNKNOWN;
1973 hdr = (struct iscsi_tm *) buf;
1974 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1975 function = hdr->flags;
1977 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1978 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1979 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1980 hdr->rtt, hdr->refcmdsn, conn->cid);
1982 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1983 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1984 hdr->rtt != RESERVED_ITT)) {
1985 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1986 hdr->rtt = RESERVED_ITT;
1989 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1990 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1991 pr_err("Task Management Request TASK_REASSIGN not"
1992 " issued as immediate command, bad iSCSI Initiator"
1993 "implementation\n");
1994 return iscsit_add_reject_cmd(cmd,
1995 ISCSI_REASON_PROTOCOL_ERROR, buf);
1997 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1998 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1999 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2001 cmd->data_direction = DMA_NONE;
2002 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2003 if (!cmd->tmr_req) {
2004 return iscsit_add_reject_cmd(cmd,
2005 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2009 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2010 conn->sess->se_sess, 0, DMA_NONE,
2011 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2013 target_get_sess_cmd(&cmd->se_cmd, true);
2016 * TASK_REASSIGN for ERL=2 / connection stays inside of
2017 * LIO-Target $FABRIC_MOD
2019 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2020 tcm_function = iscsit_convert_tmf(function);
2021 if (tcm_function == TMR_UNKNOWN) {
2022 pr_err("Unknown iSCSI TMR Function:"
2023 " 0x%02x\n", function);
2024 return iscsit_add_reject_cmd(cmd,
2025 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2028 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2031 return iscsit_add_reject_cmd(cmd,
2032 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2034 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2036 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2037 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2038 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2039 cmd->init_task_tag = hdr->itt;
2040 cmd->targ_xfer_tag = 0xFFFFFFFF;
2041 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2042 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2043 se_tmr = cmd->se_cmd.se_tmr_req;
2044 tmr_req = cmd->tmr_req;
2046 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2048 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2049 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2050 scsilun_to_int(&hdr->lun));
2052 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2058 case ISCSI_TM_FUNC_ABORT_TASK:
2059 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2060 if (se_tmr->response)
2063 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2064 case ISCSI_TM_FUNC_CLEAR_ACA:
2065 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2066 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2068 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2069 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2070 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2074 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2075 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2076 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2080 case ISCSI_TM_FUNC_TASK_REASSIGN:
2081 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2083 * Perform sanity checks on the ExpDataSN only if the
2084 * TASK_REASSIGN was successful.
2086 if (se_tmr->response)
2089 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2090 return iscsit_add_reject_cmd(cmd,
2091 ISCSI_REASON_BOOKMARK_INVALID, buf);
2094 pr_err("Unknown TMR function: 0x%02x, protocol"
2095 " error.\n", function);
2096 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2100 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2101 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2102 se_tmr->call_transport = 1;
2104 spin_lock_bh(&conn->cmd_lock);
2105 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2106 spin_unlock_bh(&conn->cmd_lock);
2108 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2109 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2110 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2111 out_of_order_cmdsn = 1;
2112 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2113 target_put_sess_cmd(&cmd->se_cmd);
2115 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2119 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2121 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2124 * Found the referenced task, send to transport for processing.
2126 if (se_tmr->call_transport)
2127 return transport_generic_handle_tmr(&cmd->se_cmd);
2130 * Could not find the referenced LUN, task, or Task Management
2131 * command not authorized or supported. Change state and
2132 * let the tx_thread send the response.
2134 * For connection recovery, this is also the default action for
2135 * TMR TASK_REASSIGN.
2137 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2138 target_put_sess_cmd(&cmd->se_cmd);
2141 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2143 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2145 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2146 struct iscsi_text *hdr)
2148 u32 payload_length = ntoh24(hdr->dlength);
2150 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2151 pr_err("Unable to accept text parameter length: %u"
2152 "greater than MaxXmitDataSegmentLength %u.\n",
2153 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2154 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2155 (unsigned char *)hdr);
2158 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2159 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2160 pr_err("Multi sequence text commands currently not supported\n");
2161 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2162 (unsigned char *)hdr);
2165 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2166 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2167 hdr->exp_statsn, payload_length);
2169 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2170 cmd->i_state = ISTATE_SEND_TEXTRSP;
2171 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2172 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2173 cmd->targ_xfer_tag = 0xFFFFFFFF;
2174 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2175 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2176 cmd->data_direction = DMA_NONE;
2177 kfree(cmd->text_in_ptr);
2178 cmd->text_in_ptr = NULL;
2182 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2185 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2186 struct iscsi_text *hdr)
2188 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2192 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2193 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2194 pr_err("Unable to locate text_in buffer for sendtargets"
2198 goto empty_sendtargets;
2200 if (strncmp("SendTargets", text_in, 11) != 0) {
2201 pr_err("Received Text Data that is not"
2202 " SendTargets, cannot continue.\n");
2205 text_ptr = strchr(text_in, '=');
2207 pr_err("No \"=\" separator found in Text Data,"
2208 " cannot continue.\n");
2211 if (!strncmp("=All", text_ptr, 4)) {
2212 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2213 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2214 !strncmp("=eui.", text_ptr, 5)) {
2215 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2217 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2221 spin_lock_bh(&conn->cmd_lock);
2222 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2223 spin_unlock_bh(&conn->cmd_lock);
2226 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2228 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2229 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2230 (unsigned char *)hdr, hdr->cmdsn);
2231 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2237 return iscsit_execute_cmd(cmd, 0);
2240 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2241 (unsigned char *)hdr);
2243 EXPORT_SYMBOL(iscsit_process_text_cmd);
2246 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2249 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2250 char *text_in = NULL;
2251 u32 payload_length = ntoh24(hdr->dlength);
2254 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2258 rx_size = payload_length;
2259 if (payload_length) {
2260 u32 checksum = 0, data_crc = 0;
2261 u32 padding = 0, pad_bytes = 0;
2262 int niov = 0, rx_got;
2265 text_in = kzalloc(payload_length, GFP_KERNEL);
2269 cmd->text_in_ptr = text_in;
2271 memset(iov, 0, 3 * sizeof(struct kvec));
2272 iov[niov].iov_base = text_in;
2273 iov[niov++].iov_len = payload_length;
2275 padding = ((-payload_length) & 3);
2277 iov[niov].iov_base = &pad_bytes;
2278 iov[niov++].iov_len = padding;
2280 pr_debug("Receiving %u additional bytes"
2281 " for padding.\n", padding);
2283 if (conn->conn_ops->DataDigest) {
2284 iov[niov].iov_base = &checksum;
2285 iov[niov++].iov_len = ISCSI_CRC_LEN;
2286 rx_size += ISCSI_CRC_LEN;
2289 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2290 if (rx_got != rx_size)
2293 if (conn->conn_ops->DataDigest) {
2294 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2295 payload_length, padding,
2296 &pad_bytes, &data_crc);
2298 if (checksum != data_crc) {
2299 pr_err("Text data CRC32C DataDigest"
2300 " 0x%08x does not match computed"
2301 " 0x%08x\n", checksum, data_crc);
2302 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2303 pr_err("Unable to recover from"
2304 " Text Data digest failure while in"
2309 * Silently drop this PDU and let the
2310 * initiator plug the CmdSN gap.
2312 pr_debug("Dropping Text"
2313 " Command CmdSN: 0x%08x due to"
2314 " DataCRC error.\n", hdr->cmdsn);
2319 pr_debug("Got CRC32C DataDigest"
2320 " 0x%08x for %u bytes of text data.\n",
2321 checksum, payload_length);
2324 text_in[payload_length - 1] = '\0';
2325 pr_debug("Successfully read %d bytes of text"
2326 " data.\n", payload_length);
2329 return iscsit_process_text_cmd(conn, cmd, hdr);
2332 kfree(cmd->text_in_ptr);
2333 cmd->text_in_ptr = NULL;
2334 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2337 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2339 struct iscsi_conn *conn_p;
2340 struct iscsi_session *sess = conn->sess;
2342 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2343 " for SID: %u.\n", conn->cid, conn->sess->sid);
2345 atomic_set(&sess->session_logout, 1);
2346 atomic_set(&conn->conn_logout_remove, 1);
2347 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2349 iscsit_inc_conn_usage_count(conn);
2350 iscsit_inc_session_usage_count(sess);
2352 spin_lock_bh(&sess->conn_lock);
2353 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2354 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2357 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2358 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2360 spin_unlock_bh(&sess->conn_lock);
2362 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2367 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2369 struct iscsi_conn *l_conn;
2370 struct iscsi_session *sess = conn->sess;
2372 pr_debug("Received logout request CLOSECONNECTION for CID:"
2373 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2376 * A Logout Request with a CLOSECONNECTION reason code for a CID
2377 * can arrive on a connection with a differing CID.
2379 if (conn->cid == cmd->logout_cid) {
2380 spin_lock_bh(&conn->state_lock);
2381 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2382 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2384 atomic_set(&conn->conn_logout_remove, 1);
2385 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2386 iscsit_inc_conn_usage_count(conn);
2388 spin_unlock_bh(&conn->state_lock);
2391 * Handle all different cid CLOSECONNECTION requests in
2392 * iscsit_logout_post_handler_diffcid() as to give enough
2393 * time for any non immediate command's CmdSN to be
2394 * acknowledged on the connection in question.
2396 * Here we simply make sure the CID is still around.
2398 l_conn = iscsit_get_conn_from_cid(sess,
2401 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2402 iscsit_add_cmd_to_response_queue(cmd, conn,
2407 iscsit_dec_conn_usage_count(l_conn);
2410 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2417 struct iscsi_session *sess = conn->sess;
2419 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2420 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2422 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2423 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2424 " while ERL!=2.\n");
2425 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2426 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2430 if (conn->cid == cmd->logout_cid) {
2431 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2432 " with CID: %hu on CID: %hu, implementation error.\n",
2433 cmd->logout_cid, conn->cid);
2434 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2435 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2439 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2445 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2448 int cmdsn_ret, logout_remove = 0;
2450 struct iscsi_logout *hdr;
2451 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2453 hdr = (struct iscsi_logout *) buf;
2454 reason_code = (hdr->flags & 0x7f);
2457 spin_lock(&tiqn->logout_stats.lock);
2458 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2459 tiqn->logout_stats.normal_logouts++;
2461 tiqn->logout_stats.abnormal_logouts++;
2462 spin_unlock(&tiqn->logout_stats.lock);
2465 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2466 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2467 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2468 hdr->cid, conn->cid);
2470 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2471 pr_err("Received logout request on connection that"
2472 " is not in logged in state, ignoring request.\n");
2473 iscsit_free_cmd(cmd, false);
2477 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2478 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2479 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2480 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2481 cmd->targ_xfer_tag = 0xFFFFFFFF;
2482 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2483 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2484 cmd->logout_cid = be16_to_cpu(hdr->cid);
2485 cmd->logout_reason = reason_code;
2486 cmd->data_direction = DMA_NONE;
2489 * We need to sleep in these cases (by returning 1) until the Logout
2490 * Response gets sent in the tx thread.
2492 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2493 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2494 be16_to_cpu(hdr->cid) == conn->cid))
2497 spin_lock_bh(&conn->cmd_lock);
2498 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2499 spin_unlock_bh(&conn->cmd_lock);
2501 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2502 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2505 * Immediate commands are executed, well, immediately.
2506 * Non-Immediate Logout Commands are executed in CmdSN order.
2508 if (cmd->immediate_cmd) {
2509 int ret = iscsit_execute_cmd(cmd, 0);
2514 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2515 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2517 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2521 return logout_remove;
2523 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2525 int iscsit_handle_snack(
2526 struct iscsi_conn *conn,
2529 struct iscsi_snack *hdr;
2531 hdr = (struct iscsi_snack *) buf;
2532 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2534 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2535 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2536 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2537 hdr->begrun, hdr->runlength, conn->cid);
2539 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2540 pr_err("Initiator sent SNACK request while in"
2541 " ErrorRecoveryLevel=0.\n");
2542 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2546 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2547 * call from inside iscsi_send_recovery_datain_or_r2t().
2549 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2551 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2553 be32_to_cpu(hdr->ttt),
2554 be32_to_cpu(hdr->begrun),
2555 be32_to_cpu(hdr->runlength));
2556 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2557 return iscsit_handle_status_snack(conn, hdr->itt,
2558 be32_to_cpu(hdr->ttt),
2559 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2560 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2561 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2562 be32_to_cpu(hdr->begrun),
2563 be32_to_cpu(hdr->runlength));
2564 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2565 /* FIXME: Support R-Data SNACK */
2566 pr_err("R-Data SNACK Not Supported.\n");
2567 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2570 pr_err("Unknown SNACK type 0x%02x, protocol"
2571 " error.\n", hdr->flags & 0x0f);
2572 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2578 EXPORT_SYMBOL(iscsit_handle_snack);
2580 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2582 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2583 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2584 wait_for_completion_interruptible_timeout(
2585 &conn->rx_half_close_comp,
2586 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2590 static int iscsit_handle_immediate_data(
2591 struct iscsi_cmd *cmd,
2592 struct iscsi_scsi_req *hdr,
2595 int iov_ret, rx_got = 0, rx_size = 0;
2596 u32 checksum, iov_count = 0, padding = 0;
2597 struct iscsi_conn *conn = cmd->conn;
2600 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2602 return IMMEDIATE_DATA_CANNOT_RECOVER;
2605 iov_count = iov_ret;
2606 iov = &cmd->iov_data[0];
2608 padding = ((-length) & 3);
2610 iov[iov_count].iov_base = cmd->pad_bytes;
2611 iov[iov_count++].iov_len = padding;
2615 if (conn->conn_ops->DataDigest) {
2616 iov[iov_count].iov_base = &checksum;
2617 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2618 rx_size += ISCSI_CRC_LEN;
2621 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2623 iscsit_unmap_iovec(cmd);
2625 if (rx_got != rx_size) {
2626 iscsit_rx_thread_wait_for_tcp(conn);
2627 return IMMEDIATE_DATA_CANNOT_RECOVER;
2630 if (conn->conn_ops->DataDigest) {
2633 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2634 cmd->write_data_done, length, padding,
2637 if (checksum != data_crc) {
2638 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2639 " does not match computed 0x%08x\n", checksum,
2642 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2643 pr_err("Unable to recover from"
2644 " Immediate Data digest failure while"
2646 iscsit_reject_cmd(cmd,
2647 ISCSI_REASON_DATA_DIGEST_ERROR,
2648 (unsigned char *)hdr);
2649 return IMMEDIATE_DATA_CANNOT_RECOVER;
2651 iscsit_reject_cmd(cmd,
2652 ISCSI_REASON_DATA_DIGEST_ERROR,
2653 (unsigned char *)hdr);
2654 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2657 pr_debug("Got CRC32C DataDigest 0x%08x for"
2658 " %u bytes of Immediate Data\n", checksum,
2663 cmd->write_data_done += length;
2665 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2666 spin_lock_bh(&cmd->istate_lock);
2667 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2668 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2669 spin_unlock_bh(&cmd->istate_lock);
2672 return IMMEDIATE_DATA_NORMAL_OPERATION;
2676 * Called with sess->conn_lock held.
2678 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2679 with active network interface */
2680 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2682 struct iscsi_cmd *cmd;
2683 struct iscsi_conn *conn_p;
2687 * Only send a Asynchronous Message on connections whos network
2688 * interface is still functional.
2690 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2691 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2692 iscsit_inc_conn_usage_count(conn_p);
2701 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2703 iscsit_dec_conn_usage_count(conn_p);
2707 cmd->logout_cid = conn->cid;
2708 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2709 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2711 spin_lock_bh(&conn_p->cmd_lock);
2712 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2713 spin_unlock_bh(&conn_p->cmd_lock);
2715 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2716 iscsit_dec_conn_usage_count(conn_p);
2719 static int iscsit_send_conn_drop_async_message(
2720 struct iscsi_cmd *cmd,
2721 struct iscsi_conn *conn)
2723 struct iscsi_async *hdr;
2725 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2727 hdr = (struct iscsi_async *) cmd->pdu;
2728 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2729 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2730 cmd->init_task_tag = RESERVED_ITT;
2731 cmd->targ_xfer_tag = 0xFFFFFFFF;
2732 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2733 cmd->stat_sn = conn->stat_sn++;
2734 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2735 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2736 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2737 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2738 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2739 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2740 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2742 pr_debug("Sending Connection Dropped Async Message StatSN:"
2743 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2744 cmd->logout_cid, conn->cid);
2746 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2749 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2751 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2752 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2753 wait_for_completion_interruptible_timeout(
2754 &conn->tx_half_close_comp,
2755 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2760 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2761 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2764 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2765 hdr->flags = datain->flags;
2766 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2767 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2768 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2769 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2770 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2771 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2772 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2775 hton24(hdr->dlength, datain->length);
2776 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2777 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2778 (struct scsi_lun *)&hdr->lun);
2780 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2782 hdr->itt = cmd->init_task_tag;
2784 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2785 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2787 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2789 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2791 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2793 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2794 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2795 hdr->datasn = cpu_to_be32(datain->data_sn);
2796 hdr->offset = cpu_to_be32(datain->offset);
2798 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2799 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2800 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2801 ntohl(hdr->offset), datain->length, conn->cid);
2803 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2805 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2807 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2808 struct iscsi_datain datain;
2809 struct iscsi_datain_req *dr;
2811 bool set_statsn = false;
2813 memset(&datain, 0, sizeof(struct iscsi_datain));
2814 dr = iscsit_get_datain_values(cmd, &datain);
2816 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2817 cmd->init_task_tag);
2821 * Be paranoid and double check the logic for now.
2823 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2824 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2825 " datain.length: %u exceeds cmd->data_length: %u\n",
2826 cmd->init_task_tag, datain.offset, datain.length,
2827 cmd->se_cmd.data_length);
2831 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2833 * Special case for successfully execution w/ both DATAIN
2836 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2837 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2838 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2840 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2841 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2842 iscsit_increment_maxcmdsn(cmd, conn->sess);
2843 cmd->stat_sn = conn->stat_sn++;
2845 } else if (dr->dr_complete ==
2846 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2850 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2852 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2856 if (dr->dr_complete) {
2857 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2859 iscsit_free_datain_req(cmd, dr);
2866 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2867 struct iscsi_logout_rsp *hdr)
2869 struct iscsi_conn *logout_conn = NULL;
2870 struct iscsi_conn_recovery *cr = NULL;
2871 struct iscsi_session *sess = conn->sess;
2873 * The actual shutting down of Sessions and/or Connections
2874 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2875 * is done in scsi_logout_post_handler().
2877 switch (cmd->logout_reason) {
2878 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2879 pr_debug("iSCSI session logout successful, setting"
2880 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2881 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2883 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2884 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2887 * For CLOSECONNECTION logout requests carrying
2888 * a matching logout CID -> local CID, the reference
2889 * for the local CID will have been incremented in
2890 * iscsi_logout_closeconnection().
2892 * For CLOSECONNECTION logout requests carrying
2893 * a different CID than the connection it arrived
2894 * on, the connection responding to cmd->logout_cid
2895 * is stopped in iscsit_logout_post_handler_diffcid().
2898 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2899 " successful.\n", cmd->logout_cid, conn->cid);
2900 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2902 case ISCSI_LOGOUT_REASON_RECOVERY:
2903 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2904 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2907 * If the connection is still active from our point of view
2908 * force connection recovery to occur.
2910 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2913 iscsit_connection_reinstatement_rcfr(logout_conn);
2914 iscsit_dec_conn_usage_count(logout_conn);
2917 cr = iscsit_get_inactive_connection_recovery_entry(
2918 conn->sess, cmd->logout_cid);
2920 pr_err("Unable to locate CID: %hu for"
2921 " REMOVECONNFORRECOVERY Logout Request.\n",
2923 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2927 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2929 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2930 " for recovery for CID: %hu on CID: %hu successful.\n",
2931 cmd->logout_cid, conn->cid);
2932 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2935 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2936 cmd->logout_reason);
2940 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2941 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2942 hdr->response = cmd->logout_response;
2943 hdr->itt = cmd->init_task_tag;
2944 cmd->stat_sn = conn->stat_sn++;
2945 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2947 iscsit_increment_maxcmdsn(cmd, conn->sess);
2948 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2949 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2951 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2952 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2953 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2954 cmd->logout_cid, conn->cid);
2958 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2961 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2965 rc = iscsit_build_logout_rsp(cmd, conn,
2966 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2970 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2974 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2975 struct iscsi_nopin *hdr, bool nopout_response)
2977 hdr->opcode = ISCSI_OP_NOOP_IN;
2978 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2979 hton24(hdr->dlength, cmd->buf_ptr_size);
2980 if (nopout_response)
2981 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2982 hdr->itt = cmd->init_task_tag;
2983 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2984 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2986 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2988 if (nopout_response)
2989 iscsit_increment_maxcmdsn(cmd, conn->sess);
2991 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2992 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2994 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2995 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2996 "Solicited" : "Unsolicited", cmd->init_task_tag,
2997 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2999 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3002 * Unsolicited NOPIN, either requesting a response or not.
3004 static int iscsit_send_unsolicited_nopin(
3005 struct iscsi_cmd *cmd,
3006 struct iscsi_conn *conn,
3009 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3012 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3014 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3015 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3017 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3021 spin_lock_bh(&cmd->istate_lock);
3022 cmd->i_state = want_response ?
3023 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3024 spin_unlock_bh(&cmd->istate_lock);
3030 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3032 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3034 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3037 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3038 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3040 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3042 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3047 static int iscsit_send_r2t(
3048 struct iscsi_cmd *cmd,
3049 struct iscsi_conn *conn)
3051 struct iscsi_r2t *r2t;
3052 struct iscsi_r2t_rsp *hdr;
3055 r2t = iscsit_get_r2t_from_list(cmd);
3059 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3060 memset(hdr, 0, ISCSI_HDR_LEN);
3061 hdr->opcode = ISCSI_OP_R2T;
3062 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3063 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3064 (struct scsi_lun *)&hdr->lun);
3065 hdr->itt = cmd->init_task_tag;
3066 if (conn->conn_transport->iscsit_get_r2t_ttt)
3067 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3069 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3070 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3071 hdr->statsn = cpu_to_be32(conn->stat_sn);
3072 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3073 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3074 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3075 hdr->data_offset = cpu_to_be32(r2t->offset);
3076 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3078 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3079 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3080 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3081 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3082 r2t->offset, r2t->xfer_len, conn->cid);
3084 spin_lock_bh(&cmd->r2t_lock);
3086 spin_unlock_bh(&cmd->r2t_lock);
3088 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3093 spin_lock_bh(&cmd->dataout_timeout_lock);
3094 iscsit_start_dataout_timer(cmd, conn);
3095 spin_unlock_bh(&cmd->dataout_timeout_lock);
3101 * @recovery: If called from iscsi_task_reassign_complete_write() for
3102 * connection recovery.
3104 int iscsit_build_r2ts_for_cmd(
3105 struct iscsi_conn *conn,
3106 struct iscsi_cmd *cmd,
3110 u32 offset = 0, xfer_len = 0;
3112 spin_lock_bh(&cmd->r2t_lock);
3113 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3114 spin_unlock_bh(&cmd->r2t_lock);
3118 if (conn->sess->sess_ops->DataSequenceInOrder &&
3120 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3122 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3123 if (conn->sess->sess_ops->DataSequenceInOrder) {
3124 offset = cmd->r2t_offset;
3126 if (first_r2t && recovery) {
3127 int new_data_end = offset +
3128 conn->sess->sess_ops->MaxBurstLength -
3129 cmd->next_burst_len;
3131 if (new_data_end > cmd->se_cmd.data_length)
3132 xfer_len = cmd->se_cmd.data_length - offset;
3135 conn->sess->sess_ops->MaxBurstLength -
3136 cmd->next_burst_len;
3138 int new_data_end = offset +
3139 conn->sess->sess_ops->MaxBurstLength;
3141 if (new_data_end > cmd->se_cmd.data_length)
3142 xfer_len = cmd->se_cmd.data_length - offset;
3144 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3146 cmd->r2t_offset += xfer_len;
3148 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3149 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151 struct iscsi_seq *seq;
3153 seq = iscsit_get_seq_holder_for_r2t(cmd);
3155 spin_unlock_bh(&cmd->r2t_lock);
3159 offset = seq->offset;
3160 xfer_len = seq->xfer_len;
3162 if (cmd->seq_send_order == cmd->seq_count)
3163 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3165 cmd->outstanding_r2ts++;
3168 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3169 spin_unlock_bh(&cmd->r2t_lock);
3173 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3176 spin_unlock_bh(&cmd->r2t_lock);
3180 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3182 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3183 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3186 cmd->stat_sn = conn->stat_sn++;
3188 atomic_long_inc(&conn->sess->rsp_pdus);
3190 memset(hdr, 0, ISCSI_HDR_LEN);
3191 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3192 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3193 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3194 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3195 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3196 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3197 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3198 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3200 hdr->response = cmd->iscsi_response;
3201 hdr->cmd_status = cmd->se_cmd.scsi_status;
3202 hdr->itt = cmd->init_task_tag;
3203 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3205 iscsit_increment_maxcmdsn(cmd, conn->sess);
3206 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3207 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3209 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3210 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3211 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3212 cmd->se_cmd.scsi_status, conn->cid);
3214 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3216 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3218 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3219 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3220 void *data_buf = NULL;
3221 u32 padding = 0, data_buf_len = 0;
3223 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3226 * Attach SENSE DATA payload to iSCSI Response PDU
3228 if (cmd->se_cmd.sense_buffer &&
3229 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3230 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3231 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3232 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3234 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3235 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3236 data_buf = cmd->sense_buffer;
3237 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3240 memset(cmd->sense_buffer +
3241 cmd->se_cmd.scsi_sense_length, 0, padding);
3242 pr_debug("Adding %u bytes of padding to"
3243 " SENSE.\n", padding);
3246 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3248 cmd->se_cmd.scsi_sense_length);
3251 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3255 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3257 switch (se_tmr->response) {
3258 case TMR_FUNCTION_COMPLETE:
3259 return ISCSI_TMF_RSP_COMPLETE;
3260 case TMR_TASK_DOES_NOT_EXIST:
3261 return ISCSI_TMF_RSP_NO_TASK;
3262 case TMR_LUN_DOES_NOT_EXIST:
3263 return ISCSI_TMF_RSP_NO_LUN;
3264 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3265 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3266 case TMR_FUNCTION_REJECTED:
3268 return ISCSI_TMF_RSP_REJECTED;
3273 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3274 struct iscsi_tm_rsp *hdr)
3276 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3278 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3279 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3280 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3281 hdr->itt = cmd->init_task_tag;
3282 cmd->stat_sn = conn->stat_sn++;
3283 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3285 iscsit_increment_maxcmdsn(cmd, conn->sess);
3286 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3287 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3289 pr_debug("Built Task Management Response ITT: 0x%08x,"
3290 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3291 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3293 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3296 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3298 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3300 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3302 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3305 #define SENDTARGETS_BUF_LIMIT 32768U
3308 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3309 enum iscsit_transport_type network_transport,
3310 int skip_bytes, bool *completed)
3312 char *payload = NULL;
3313 struct iscsi_conn *conn = cmd->conn;
3314 struct iscsi_portal_group *tpg;
3315 struct iscsi_tiqn *tiqn;
3316 struct iscsi_tpg_np *tpg_np;
3317 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3318 int target_name_printed;
3319 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3320 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3323 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3324 SENDTARGETS_BUF_LIMIT);
3326 payload = kzalloc(buffer_len, GFP_KERNEL);
3331 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3334 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3335 text_ptr = strchr(text_in, '=');
3337 pr_err("Unable to locate '=' string in text_in:"
3343 * Skip over '=' character..
3348 spin_lock(&tiqn_lock);
3349 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3350 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3351 strcmp(tiqn->tiqn, text_ptr)) {
3355 target_name_printed = 0;
3357 spin_lock(&tiqn->tiqn_tpg_lock);
3358 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3360 /* If demo_mode_discovery=0 and generate_node_acls=0
3361 * (demo mode dislabed) do not return
3362 * TargetName+TargetAddress unless a NodeACL exists.
3365 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3366 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3367 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3368 cmd->conn->sess->sess_ops->InitiatorName))) {
3372 spin_lock(&tpg->tpg_state_lock);
3373 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3374 spin_unlock(&tpg->tpg_state_lock);
3376 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3379 spin_lock(&tpg->tpg_np_lock);
3380 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3382 struct iscsi_np *np = tpg_np->tpg_np;
3383 struct sockaddr_storage *sockaddr;
3385 if (np->np_network_transport != network_transport)
3388 if (!target_name_printed) {
3389 len = sprintf(buf, "TargetName=%s",
3393 if ((len + payload_len) > buffer_len) {
3394 spin_unlock(&tpg->tpg_np_lock);
3395 spin_unlock(&tiqn->tiqn_tpg_lock);
3400 if (skip_bytes && len <= skip_bytes) {
3403 memcpy(payload + payload_len, buf, len);
3405 target_name_printed = 1;
3406 if (len > skip_bytes)
3411 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3412 sockaddr = &conn->local_sockaddr;
3414 sockaddr = &np->np_sockaddr;
3416 len = sprintf(buf, "TargetAddress="
3422 if ((len + payload_len) > buffer_len) {
3423 spin_unlock(&tpg->tpg_np_lock);
3424 spin_unlock(&tiqn->tiqn_tpg_lock);
3429 if (skip_bytes && len <= skip_bytes) {
3432 memcpy(payload + payload_len, buf, len);
3434 if (len > skip_bytes)
3438 spin_unlock(&tpg->tpg_np_lock);
3440 spin_unlock(&tiqn->tiqn_tpg_lock);
3447 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3450 spin_unlock(&tiqn_lock);
3452 cmd->buf_ptr = payload;
3458 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3459 struct iscsi_text_rsp *hdr,
3460 enum iscsit_transport_type network_transport)
3462 int text_length, padding;
3463 bool completed = true;
3465 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3466 cmd->read_data_done,
3468 if (text_length < 0)
3472 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3474 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3475 cmd->read_data_done += text_length;
3476 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3477 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3479 hdr->opcode = ISCSI_OP_TEXT_RSP;
3480 padding = ((-text_length) & 3);
3481 hton24(hdr->dlength, text_length);
3482 hdr->itt = cmd->init_task_tag;
3483 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3484 cmd->stat_sn = conn->stat_sn++;
3485 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3487 iscsit_increment_maxcmdsn(cmd, conn->sess);
3489 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3490 * correctly increment MaxCmdSN for each response answering a
3491 * non immediate text request with a valid CmdSN.
3493 cmd->maxcmdsn_inc = 0;
3494 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3495 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3497 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3498 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3499 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3500 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3501 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3503 return text_length + padding;
3505 EXPORT_SYMBOL(iscsit_build_text_rsp);
3507 static int iscsit_send_text_rsp(
3508 struct iscsi_cmd *cmd,
3509 struct iscsi_conn *conn)
3511 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3514 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3515 conn->conn_transport->transport_type);
3516 if (text_length < 0)
3519 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3525 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3526 struct iscsi_reject *hdr)
3528 hdr->opcode = ISCSI_OP_REJECT;
3529 hdr->reason = cmd->reject_reason;
3530 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3531 hton24(hdr->dlength, ISCSI_HDR_LEN);
3532 hdr->ffffffff = cpu_to_be32(0xffffffff);
3533 cmd->stat_sn = conn->stat_sn++;
3534 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3535 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3536 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3539 EXPORT_SYMBOL(iscsit_build_reject);
3541 static int iscsit_send_reject(
3542 struct iscsi_cmd *cmd,
3543 struct iscsi_conn *conn)
3545 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3547 iscsit_build_reject(cmd, conn, hdr);
3549 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3550 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3552 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3557 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3561 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3562 * within iscsit_start_kthreads()
3564 * Here we use bitmap_id to determine which CPU that this
3565 * iSCSI connection's RX/TX threads will be scheduled to
3568 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3569 for_each_online_cpu(cpu) {
3571 cpumask_set_cpu(cpu, conn->conn_cpumask);
3576 * This should never be reached..
3579 cpumask_setall(conn->conn_cpumask);
3583 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3588 case ISTATE_SEND_R2T:
3589 ret = iscsit_send_r2t(cmd, conn);
3594 spin_lock_bh(&conn->cmd_lock);
3595 list_del_init(&cmd->i_conn_node);
3596 spin_unlock_bh(&conn->cmd_lock);
3598 iscsit_free_cmd(cmd, false);
3600 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3601 iscsit_mod_nopin_response_timer(conn);
3602 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3606 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3607 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3612 pr_err("Unknown Opcode: 0x%02x ITT:"
3613 " 0x%08x, i_state: %d on CID: %hu\n",
3614 cmd->iscsi_opcode, cmd->init_task_tag, state,
3624 EXPORT_SYMBOL(iscsit_immediate_queue);
3627 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3629 struct iscsit_transport *t = conn->conn_transport;
3630 struct iscsi_queue_req *qr;
3631 struct iscsi_cmd *cmd;
3635 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3636 atomic_set(&conn->check_immediate_queue, 0);
3639 kmem_cache_free(lio_qr_cache, qr);
3641 ret = t->iscsit_immediate_queue(conn, cmd, state);
3650 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3656 case ISTATE_SEND_DATAIN:
3657 ret = iscsit_send_datain(cmd, conn);
3662 goto check_rsp_state;
3663 else if (ret == 1) {
3665 spin_lock_bh(&cmd->istate_lock);
3666 cmd->i_state = ISTATE_SENT_STATUS;
3667 spin_unlock_bh(&cmd->istate_lock);
3669 if (atomic_read(&conn->check_immediate_queue))
3673 } else if (ret == 2) {
3674 /* Still must send status,
3675 SCF_TRANSPORT_TASK_SENSE was set */
3676 spin_lock_bh(&cmd->istate_lock);
3677 cmd->i_state = ISTATE_SEND_STATUS;
3678 spin_unlock_bh(&cmd->istate_lock);
3679 state = ISTATE_SEND_STATUS;
3680 goto check_rsp_state;
3684 case ISTATE_SEND_STATUS:
3685 case ISTATE_SEND_STATUS_RECOVERY:
3686 ret = iscsit_send_response(cmd, conn);
3688 case ISTATE_SEND_LOGOUTRSP:
3689 ret = iscsit_send_logout(cmd, conn);
3691 case ISTATE_SEND_ASYNCMSG:
3692 ret = iscsit_send_conn_drop_async_message(
3695 case ISTATE_SEND_NOPIN:
3696 ret = iscsit_send_nopin(cmd, conn);
3698 case ISTATE_SEND_REJECT:
3699 ret = iscsit_send_reject(cmd, conn);
3701 case ISTATE_SEND_TASKMGTRSP:
3702 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3705 ret = iscsit_tmr_post_handler(cmd, conn);
3707 iscsit_fall_back_to_erl0(conn->sess);
3709 case ISTATE_SEND_TEXTRSP:
3710 ret = iscsit_send_text_rsp(cmd, conn);
3713 pr_err("Unknown Opcode: 0x%02x ITT:"
3714 " 0x%08x, i_state: %d on CID: %hu\n",
3715 cmd->iscsi_opcode, cmd->init_task_tag,
3723 case ISTATE_SEND_LOGOUTRSP:
3724 if (!iscsit_logout_post_handler(cmd, conn))
3727 case ISTATE_SEND_STATUS:
3728 case ISTATE_SEND_ASYNCMSG:
3729 case ISTATE_SEND_NOPIN:
3730 case ISTATE_SEND_STATUS_RECOVERY:
3731 case ISTATE_SEND_TEXTRSP:
3732 case ISTATE_SEND_TASKMGTRSP:
3733 case ISTATE_SEND_REJECT:
3734 spin_lock_bh(&cmd->istate_lock);
3735 cmd->i_state = ISTATE_SENT_STATUS;
3736 spin_unlock_bh(&cmd->istate_lock);
3739 pr_err("Unknown Opcode: 0x%02x ITT:"
3740 " 0x%08x, i_state: %d on CID: %hu\n",
3741 cmd->iscsi_opcode, cmd->init_task_tag,
3742 cmd->i_state, conn->cid);
3746 if (atomic_read(&conn->check_immediate_queue))
3754 EXPORT_SYMBOL(iscsit_response_queue);
3756 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3758 struct iscsit_transport *t = conn->conn_transport;
3759 struct iscsi_queue_req *qr;
3760 struct iscsi_cmd *cmd;
3764 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3767 kmem_cache_free(lio_qr_cache, qr);
3769 ret = t->iscsit_response_queue(conn, cmd, state);
3770 if (ret == 1 || ret < 0)
3777 int iscsi_target_tx_thread(void *arg)
3780 struct iscsi_conn *conn = arg;
3781 bool conn_freed = false;
3784 * Allow ourselves to be interrupted by SIGINT so that a
3785 * connection recovery / failure event can be triggered externally.
3787 allow_signal(SIGINT);
3789 while (!kthread_should_stop()) {
3791 * Ensure that both TX and RX per connection kthreads
3792 * are scheduled to run on the same CPU.
3794 iscsit_thread_check_cpumask(conn, current, 1);
3796 wait_event_interruptible(conn->queues_wq,
3797 !iscsit_conn_all_queues_empty(conn));
3799 if (signal_pending(current))
3803 ret = iscsit_handle_immediate_queue(conn);
3807 ret = iscsit_handle_response_queue(conn);
3810 } else if (ret == -ECONNRESET) {
3813 } else if (ret < 0) {
3820 * Avoid the normal connection failure code-path if this connection
3821 * is still within LOGIN mode, and iscsi_np process context is
3822 * responsible for cleaning up the early connection failure.
3824 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3825 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3828 while (!kthread_should_stop()) {
3835 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3837 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3838 struct iscsi_cmd *cmd;
3841 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3842 case ISCSI_OP_SCSI_CMD:
3843 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3847 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3849 case ISCSI_OP_SCSI_DATA_OUT:
3850 ret = iscsit_handle_data_out(conn, buf);
3852 case ISCSI_OP_NOOP_OUT:
3854 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3855 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3859 ret = iscsit_handle_nop_out(conn, cmd, buf);
3861 case ISCSI_OP_SCSI_TMFUNC:
3862 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3866 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3869 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3870 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3874 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3879 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3881 case ISCSI_OP_LOGOUT:
3882 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3886 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3888 wait_for_completion_timeout(&conn->conn_logout_comp,
3889 SECONDS_FOR_LOGOUT_COMP * HZ);
3891 case ISCSI_OP_SNACK:
3892 ret = iscsit_handle_snack(conn, buf);
3895 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3896 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3897 pr_err("Cannot recover from unknown"
3898 " opcode while ERL=0, closing iSCSI connection.\n");
3901 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3902 " closing iSCSI connection.\n");
3909 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3912 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3916 spin_lock_bh(&conn->state_lock);
3917 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3918 spin_unlock_bh(&conn->state_lock);
3923 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3927 u32 checksum = 0, digest = 0;
3930 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3934 while (!kthread_should_stop()) {
3936 * Ensure that both TX and RX per connection kthreads
3937 * are scheduled to run on the same CPU.
3939 iscsit_thread_check_cpumask(conn, current, 0);
3941 memset(&iov, 0, sizeof(struct kvec));
3943 iov.iov_base = buffer;
3944 iov.iov_len = ISCSI_HDR_LEN;
3946 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3947 if (ret != ISCSI_HDR_LEN) {
3948 iscsit_rx_thread_wait_for_tcp(conn);
3952 if (conn->conn_ops->HeaderDigest) {
3953 iov.iov_base = &digest;
3954 iov.iov_len = ISCSI_CRC_LEN;
3956 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3957 if (ret != ISCSI_CRC_LEN) {
3958 iscsit_rx_thread_wait_for_tcp(conn);
3962 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3963 ISCSI_HDR_LEN, 0, NULL,
3966 if (digest != checksum) {
3967 pr_err("HeaderDigest CRC32C failed,"
3968 " received 0x%08x, computed 0x%08x\n",
3971 * Set the PDU to 0xff so it will intentionally
3972 * hit default in the switch below.
3974 memset(buffer, 0xff, ISCSI_HDR_LEN);
3975 atomic_long_inc(&conn->sess->conn_digest_errors);
3977 pr_debug("Got HeaderDigest CRC32C"
3978 " 0x%08x\n", checksum);
3982 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3985 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3987 if (conn->sess->sess_ops->SessionType &&
3988 ((!(opcode & ISCSI_OP_TEXT)) ||
3989 (!(opcode & ISCSI_OP_LOGOUT)))) {
3990 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3991 " while in Discovery Session, rejecting.\n", opcode);
3992 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3997 ret = iscsi_target_rx_opcode(conn, buffer);
4005 int iscsi_target_rx_thread(void *arg)
4008 struct iscsi_conn *conn = arg;
4009 bool conn_freed = false;
4012 * Allow ourselves to be interrupted by SIGINT so that a
4013 * connection recovery / failure event can be triggered externally.
4015 allow_signal(SIGINT);
4017 * Wait for iscsi_post_login_handler() to complete before allowing
4018 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4020 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4021 if (rc < 0 || iscsi_target_check_conn_state(conn))
4024 if (!conn->conn_transport->iscsit_get_rx_pdu)
4027 conn->conn_transport->iscsit_get_rx_pdu(conn);
4029 if (!signal_pending(current))
4030 atomic_set(&conn->transport_failed, 1);
4031 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4035 while (!kthread_should_stop()) {
4043 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4045 LIST_HEAD(tmp_list);
4046 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4047 struct iscsi_session *sess = conn->sess;
4049 * We expect this function to only ever be called from either RX or TX
4050 * thread context via iscsit_close_connection() once the other context
4051 * has been reset -> returned sleeping pre-handler state.
4053 spin_lock_bh(&conn->cmd_lock);
4054 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4056 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4057 struct se_cmd *se_cmd = &cmd->se_cmd;
4059 if (se_cmd->se_tfo != NULL) {
4060 spin_lock_irq(&se_cmd->t_state_lock);
4061 if (se_cmd->transport_state & CMD_T_ABORTED) {
4063 * LIO's abort path owns the cleanup for this,
4064 * so put it back on the list and let
4065 * aborted_task handle it.
4067 list_move_tail(&cmd->i_conn_node,
4068 &conn->conn_cmd_list);
4070 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4072 spin_unlock_irq(&se_cmd->t_state_lock);
4075 spin_unlock_bh(&conn->cmd_lock);
4077 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4078 list_del_init(&cmd->i_conn_node);
4080 iscsit_increment_maxcmdsn(cmd, sess);
4081 iscsit_free_cmd(cmd, true);
4086 static void iscsit_stop_timers_for_cmds(
4087 struct iscsi_conn *conn)
4089 struct iscsi_cmd *cmd;
4091 spin_lock_bh(&conn->cmd_lock);
4092 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4093 if (cmd->data_direction == DMA_TO_DEVICE)
4094 iscsit_stop_dataout_timer(cmd);
4096 spin_unlock_bh(&conn->cmd_lock);
4099 int iscsit_close_connection(
4100 struct iscsi_conn *conn)
4102 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4103 struct iscsi_session *sess = conn->sess;
4105 pr_debug("Closing iSCSI connection CID %hu on SID:"
4106 " %u\n", conn->cid, sess->sid);
4108 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4109 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4110 * sleeping and the logout response never got sent because the
4111 * connection failed.
4113 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4114 * to signal logout response TX interrupt completion. Go ahead and skip
4115 * this for iser since isert_rx_opcode() does not wait on logout failure,
4116 * and to avoid iscsi_conn pointer dereference in iser-target code.
4118 if (!conn->conn_transport->rdma_shutdown)
4119 complete(&conn->conn_logout_comp);
4121 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4122 if (conn->tx_thread &&
4123 cmpxchg(&conn->tx_thread_active, true, false)) {
4124 send_sig(SIGINT, conn->tx_thread, 1);
4125 kthread_stop(conn->tx_thread);
4127 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4128 if (conn->rx_thread &&
4129 cmpxchg(&conn->rx_thread_active, true, false)) {
4130 send_sig(SIGINT, conn->rx_thread, 1);
4131 kthread_stop(conn->rx_thread);
4135 spin_lock(&iscsit_global->ts_bitmap_lock);
4136 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4138 spin_unlock(&iscsit_global->ts_bitmap_lock);
4140 iscsit_stop_timers_for_cmds(conn);
4141 iscsit_stop_nopin_response_timer(conn);
4142 iscsit_stop_nopin_timer(conn);
4144 if (conn->conn_transport->iscsit_wait_conn)
4145 conn->conn_transport->iscsit_wait_conn(conn);
4148 * During Connection recovery drop unacknowledged out of order
4149 * commands for this connection, and prepare the other commands
4152 * During normal operation clear the out of order commands (but
4153 * do not free the struct iscsi_ooo_cmdsn's) and release all
4154 * struct iscsi_cmds.
4156 if (atomic_read(&conn->connection_recovery)) {
4157 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4158 iscsit_prepare_cmds_for_reallegiance(conn);
4160 iscsit_clear_ooo_cmdsns_for_conn(conn);
4161 iscsit_release_commands_from_conn(conn);
4163 iscsit_free_queue_reqs_for_conn(conn);
4166 * Handle decrementing session or connection usage count if
4167 * a logout response was not able to be sent because the
4168 * connection failed. Fall back to Session Recovery here.
4170 if (atomic_read(&conn->conn_logout_remove)) {
4171 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4172 iscsit_dec_conn_usage_count(conn);
4173 iscsit_dec_session_usage_count(sess);
4175 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4176 iscsit_dec_conn_usage_count(conn);
4178 atomic_set(&conn->conn_logout_remove, 0);
4179 atomic_set(&sess->session_reinstatement, 0);
4180 atomic_set(&sess->session_fall_back_to_erl0, 1);
4183 spin_lock_bh(&sess->conn_lock);
4184 list_del(&conn->conn_list);
4187 * Attempt to let the Initiator know this connection failed by
4188 * sending an Connection Dropped Async Message on another
4189 * active connection.
4191 if (atomic_read(&conn->connection_recovery))
4192 iscsit_build_conn_drop_async_message(conn);
4194 spin_unlock_bh(&sess->conn_lock);
4197 * If connection reinstatement is being performed on this connection,
4198 * up the connection reinstatement semaphore that is being blocked on
4199 * in iscsit_cause_connection_reinstatement().
4201 spin_lock_bh(&conn->state_lock);
4202 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4203 spin_unlock_bh(&conn->state_lock);
4204 complete(&conn->conn_wait_comp);
4205 wait_for_completion(&conn->conn_post_wait_comp);
4206 spin_lock_bh(&conn->state_lock);
4210 * If connection reinstatement is being performed on this connection
4211 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4212 * connection wait rcfr semaphore that is being blocked on
4213 * an iscsit_connection_reinstatement_rcfr().
4215 if (atomic_read(&conn->connection_wait_rcfr)) {
4216 spin_unlock_bh(&conn->state_lock);
4217 complete(&conn->conn_wait_rcfr_comp);
4218 wait_for_completion(&conn->conn_post_wait_comp);
4219 spin_lock_bh(&conn->state_lock);
4221 atomic_set(&conn->connection_reinstatement, 1);
4222 spin_unlock_bh(&conn->state_lock);
4225 * If any other processes are accessing this connection pointer we
4226 * must wait until they have completed.
4228 iscsit_check_conn_usage_count(conn);
4230 ahash_request_free(conn->conn_tx_hash);
4231 if (conn->conn_rx_hash) {
4232 struct crypto_ahash *tfm;
4234 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4235 ahash_request_free(conn->conn_rx_hash);
4236 crypto_free_ahash(tfm);
4240 sock_release(conn->sock);
4242 if (conn->conn_transport->iscsit_free_conn)
4243 conn->conn_transport->iscsit_free_conn(conn);
4245 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4246 conn->conn_state = TARG_CONN_STATE_FREE;
4247 iscsit_free_conn(conn);
4249 spin_lock_bh(&sess->conn_lock);
4250 atomic_dec(&sess->nconn);
4251 pr_debug("Decremented iSCSI connection count to %hu from node:"
4252 " %s\n", atomic_read(&sess->nconn),
4253 sess->sess_ops->InitiatorName);
4255 * Make sure that if one connection fails in an non ERL=2 iSCSI
4256 * Session that they all fail.
4258 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4259 !atomic_read(&sess->session_logout))
4260 atomic_set(&sess->session_fall_back_to_erl0, 1);
4263 * If this was not the last connection in the session, and we are
4264 * performing session reinstatement or falling back to ERL=0, call
4265 * iscsit_stop_session() without sleeping to shutdown the other
4266 * active connections.
4268 if (atomic_read(&sess->nconn)) {
4269 if (!atomic_read(&sess->session_reinstatement) &&
4270 !atomic_read(&sess->session_fall_back_to_erl0)) {
4271 spin_unlock_bh(&sess->conn_lock);
4274 if (!atomic_read(&sess->session_stop_active)) {
4275 atomic_set(&sess->session_stop_active, 1);
4276 spin_unlock_bh(&sess->conn_lock);
4277 iscsit_stop_session(sess, 0, 0);
4280 spin_unlock_bh(&sess->conn_lock);
4285 * If this was the last connection in the session and one of the
4286 * following is occurring:
4288 * Session Reinstatement is not being performed, and are falling back
4289 * to ERL=0 call iscsit_close_session().
4291 * Session Logout was requested. iscsit_close_session() will be called
4294 * Session Continuation is not being performed, start the Time2Retain
4295 * handler and check if sleep_on_sess_wait_sem is active.
4297 if (!atomic_read(&sess->session_reinstatement) &&
4298 atomic_read(&sess->session_fall_back_to_erl0)) {
4299 spin_unlock_bh(&sess->conn_lock);
4300 complete_all(&sess->session_wait_comp);
4301 iscsit_close_session(sess);
4304 } else if (atomic_read(&sess->session_logout)) {
4305 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4306 sess->session_state = TARG_SESS_STATE_FREE;
4308 if (atomic_read(&sess->session_close)) {
4309 spin_unlock_bh(&sess->conn_lock);
4310 complete_all(&sess->session_wait_comp);
4311 iscsit_close_session(sess);
4313 spin_unlock_bh(&sess->conn_lock);
4318 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4319 sess->session_state = TARG_SESS_STATE_FAILED;
4321 if (!atomic_read(&sess->session_continuation))
4322 iscsit_start_time2retain_handler(sess);
4324 if (atomic_read(&sess->session_close)) {
4325 spin_unlock_bh(&sess->conn_lock);
4326 complete_all(&sess->session_wait_comp);
4327 iscsit_close_session(sess);
4329 spin_unlock_bh(&sess->conn_lock);
4337 * If the iSCSI Session for the iSCSI Initiator Node exists,
4338 * forcefully shutdown the iSCSI NEXUS.
4340 int iscsit_close_session(struct iscsi_session *sess)
4342 struct iscsi_portal_group *tpg = sess->tpg;
4343 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4345 if (atomic_read(&sess->nconn)) {
4346 pr_err("%d connection(s) still exist for iSCSI session"
4347 " to %s\n", atomic_read(&sess->nconn),
4348 sess->sess_ops->InitiatorName);
4352 spin_lock_bh(&se_tpg->session_lock);
4353 atomic_set(&sess->session_logout, 1);
4354 atomic_set(&sess->session_reinstatement, 1);
4355 iscsit_stop_time2retain_timer(sess);
4356 spin_unlock_bh(&se_tpg->session_lock);
4359 * transport_deregister_session_configfs() will clear the
4360 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4361 * can be setting it again with __transport_register_session() in
4362 * iscsi_post_login_handler() again after the iscsit_stop_session()
4363 * completes in iscsi_np context.
4365 transport_deregister_session_configfs(sess->se_sess);
4368 * If any other processes are accessing this session pointer we must
4369 * wait until they have completed. If we are in an interrupt (the
4370 * time2retain handler) and contain and active session usage count we
4371 * restart the timer and exit.
4373 if (!in_interrupt()) {
4374 if (iscsit_check_session_usage_count(sess) == 1)
4375 iscsit_stop_session(sess, 1, 1);
4377 if (iscsit_check_session_usage_count(sess) == 2) {
4378 atomic_set(&sess->session_logout, 0);
4379 iscsit_start_time2retain_handler(sess);
4384 transport_deregister_session(sess->se_sess);
4386 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4387 iscsit_free_connection_recovery_entires(sess);
4389 iscsit_free_all_ooo_cmdsns(sess);
4391 spin_lock_bh(&se_tpg->session_lock);
4392 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4393 sess->session_state = TARG_SESS_STATE_FREE;
4394 pr_debug("Released iSCSI session from node: %s\n",
4395 sess->sess_ops->InitiatorName);
4398 tpg->tpg_tiqn->tiqn_nsessions--;
4400 pr_debug("Decremented number of active iSCSI Sessions on"
4401 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4403 ida_free(&sess_ida, sess->session_index);
4404 kfree(sess->sess_ops);
4405 sess->sess_ops = NULL;
4406 spin_unlock_bh(&se_tpg->session_lock);
4412 static void iscsit_logout_post_handler_closesession(
4413 struct iscsi_conn *conn)
4415 struct iscsi_session *sess = conn->sess;
4418 * Traditional iscsi/tcp will invoke this logic from TX thread
4419 * context during session logout, so clear tx_thread_active and
4420 * sleep if iscsit_close_connection() has not already occured.
4422 * Since iser-target invokes this logic from it's own workqueue,
4423 * always sleep waiting for RX/TX thread shutdown to complete
4424 * within iscsit_close_connection().
4426 if (!conn->conn_transport->rdma_shutdown) {
4427 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4432 atomic_set(&conn->conn_logout_remove, 0);
4433 complete(&conn->conn_logout_comp);
4435 iscsit_dec_conn_usage_count(conn);
4436 atomic_set(&sess->session_close, 1);
4437 iscsit_stop_session(sess, sleep, sleep);
4438 iscsit_dec_session_usage_count(sess);
4441 static void iscsit_logout_post_handler_samecid(
4442 struct iscsi_conn *conn)
4446 if (!conn->conn_transport->rdma_shutdown) {
4447 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4452 atomic_set(&conn->conn_logout_remove, 0);
4453 complete(&conn->conn_logout_comp);
4455 iscsit_cause_connection_reinstatement(conn, sleep);
4456 iscsit_dec_conn_usage_count(conn);
4459 static void iscsit_logout_post_handler_diffcid(
4460 struct iscsi_conn *conn,
4463 struct iscsi_conn *l_conn;
4464 struct iscsi_session *sess = conn->sess;
4465 bool conn_found = false;
4470 spin_lock_bh(&sess->conn_lock);
4471 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4472 if (l_conn->cid == cid) {
4473 iscsit_inc_conn_usage_count(l_conn);
4478 spin_unlock_bh(&sess->conn_lock);
4484 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4486 spin_lock_bh(&l_conn->state_lock);
4487 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4488 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4489 spin_unlock_bh(&l_conn->state_lock);
4491 iscsit_cause_connection_reinstatement(l_conn, 1);
4492 iscsit_dec_conn_usage_count(l_conn);
4496 * Return of 0 causes the TX thread to restart.
4498 int iscsit_logout_post_handler(
4499 struct iscsi_cmd *cmd,
4500 struct iscsi_conn *conn)
4504 switch (cmd->logout_reason) {
4505 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4506 switch (cmd->logout_response) {
4507 case ISCSI_LOGOUT_SUCCESS:
4508 case ISCSI_LOGOUT_CLEANUP_FAILED:
4510 iscsit_logout_post_handler_closesession(conn);
4515 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4516 if (conn->cid == cmd->logout_cid) {
4517 switch (cmd->logout_response) {
4518 case ISCSI_LOGOUT_SUCCESS:
4519 case ISCSI_LOGOUT_CLEANUP_FAILED:
4521 iscsit_logout_post_handler_samecid(conn);
4526 switch (cmd->logout_response) {
4527 case ISCSI_LOGOUT_SUCCESS:
4528 iscsit_logout_post_handler_diffcid(conn,
4531 case ISCSI_LOGOUT_CID_NOT_FOUND:
4532 case ISCSI_LOGOUT_CLEANUP_FAILED:
4539 case ISCSI_LOGOUT_REASON_RECOVERY:
4540 switch (cmd->logout_response) {
4541 case ISCSI_LOGOUT_SUCCESS:
4542 case ISCSI_LOGOUT_CID_NOT_FOUND:
4543 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4544 case ISCSI_LOGOUT_CLEANUP_FAILED:
4556 EXPORT_SYMBOL(iscsit_logout_post_handler);
4558 void iscsit_fail_session(struct iscsi_session *sess)
4560 struct iscsi_conn *conn;
4562 spin_lock_bh(&sess->conn_lock);
4563 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4564 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4565 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4567 spin_unlock_bh(&sess->conn_lock);
4569 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4570 sess->session_state = TARG_SESS_STATE_FAILED;
4573 void iscsit_stop_session(
4574 struct iscsi_session *sess,
4576 int connection_sleep)
4578 u16 conn_count = atomic_read(&sess->nconn);
4579 struct iscsi_conn *conn, *conn_tmp = NULL;
4582 spin_lock_bh(&sess->conn_lock);
4584 if (connection_sleep) {
4585 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4587 if (conn_count == 0)
4590 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4593 iscsit_inc_conn_usage_count(conn_tmp);
4596 iscsit_inc_conn_usage_count(conn);
4598 spin_unlock_bh(&sess->conn_lock);
4599 iscsit_cause_connection_reinstatement(conn, 1);
4600 spin_lock_bh(&sess->conn_lock);
4602 iscsit_dec_conn_usage_count(conn);
4604 iscsit_dec_conn_usage_count(conn_tmp);
4608 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4609 iscsit_cause_connection_reinstatement(conn, 0);
4612 if (session_sleep && atomic_read(&sess->nconn)) {
4613 spin_unlock_bh(&sess->conn_lock);
4614 wait_for_completion(&sess->session_wait_comp);
4616 spin_unlock_bh(&sess->conn_lock);
4619 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4621 struct iscsi_session *sess;
4622 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4623 struct se_session *se_sess, *se_sess_tmp;
4624 LIST_HEAD(free_list);
4625 int session_count = 0;
4627 spin_lock_bh(&se_tpg->session_lock);
4628 if (tpg->nsessions && !force) {
4629 spin_unlock_bh(&se_tpg->session_lock);
4633 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4635 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4637 spin_lock(&sess->conn_lock);
4638 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4639 atomic_read(&sess->session_logout) ||
4640 atomic_read(&sess->session_close) ||
4641 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4642 spin_unlock(&sess->conn_lock);
4645 iscsit_inc_session_usage_count(sess);
4646 atomic_set(&sess->session_reinstatement, 1);
4647 atomic_set(&sess->session_fall_back_to_erl0, 1);
4648 atomic_set(&sess->session_close, 1);
4649 spin_unlock(&sess->conn_lock);
4651 list_move_tail(&se_sess->sess_list, &free_list);
4653 spin_unlock_bh(&se_tpg->session_lock);
4655 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4656 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4658 list_del_init(&se_sess->sess_list);
4659 iscsit_stop_session(sess, 1, 1);
4660 iscsit_dec_session_usage_count(sess);
4664 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4665 " Group: %hu\n", session_count, tpg->tpgt);
4669 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4670 MODULE_VERSION("4.1.x");
4671 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4672 MODULE_LICENSE("GPL");
4674 module_init(iscsi_target_init_module);
4675 module_exit(iscsi_target_cleanup_module);