1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains main functions related to the iSCSI Target Core Driver.
5 * (c) Copyright 2007-2013 Datera, Inc.
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 ******************************************************************************/
11 #include <crypto/hash.h>
12 #include <linux/string.h>
13 #include <linux/kthread.h>
14 #include <linux/completion.h>
15 #include <linux/module.h>
16 #include <linux/vmalloc.h>
17 #include <linux/idr.h>
18 #include <linux/delay.h>
19 #include <linux/sched/signal.h>
20 #include <asm/unaligned.h>
21 #include <linux/inet.h>
23 #include <scsi/scsi_proto.h>
24 #include <scsi/iscsi_proto.h>
25 #include <scsi/scsi_tcq.h>
26 #include <target/target_core_base.h>
27 #include <target/target_core_fabric.h>
29 #include <target/iscsi/iscsi_target_core.h>
30 #include "iscsi_target_parameters.h"
31 #include "iscsi_target_seq_pdu_list.h"
32 #include "iscsi_target_datain_values.h"
33 #include "iscsi_target_erl0.h"
34 #include "iscsi_target_erl1.h"
35 #include "iscsi_target_erl2.h"
36 #include "iscsi_target_login.h"
37 #include "iscsi_target_tmr.h"
38 #include "iscsi_target_tpg.h"
39 #include "iscsi_target_util.h"
40 #include "iscsi_target.h"
41 #include "iscsi_target_device.h"
42 #include <target/iscsi/iscsi_target_stat.h>
44 #include <target/iscsi/iscsi_transport.h>
46 static LIST_HEAD(g_tiqn_list);
47 static LIST_HEAD(g_np_list);
48 static DEFINE_SPINLOCK(tiqn_lock);
49 static DEFINE_MUTEX(np_lock);
51 static struct idr tiqn_idr;
53 struct mutex auth_id_lock;
55 struct iscsit_global *iscsit_global;
57 struct kmem_cache *lio_qr_cache;
58 struct kmem_cache *lio_dr_cache;
59 struct kmem_cache *lio_ooo_cache;
60 struct kmem_cache *lio_r2t_cache;
62 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
63 struct iscsi_scsi_req *, u32);
65 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
67 struct iscsi_tiqn *tiqn = NULL;
69 spin_lock(&tiqn_lock);
70 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
71 if (!strcmp(tiqn->tiqn, buf)) {
73 spin_lock(&tiqn->tiqn_state_lock);
74 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
75 tiqn->tiqn_access_count++;
76 spin_unlock(&tiqn->tiqn_state_lock);
77 spin_unlock(&tiqn_lock);
80 spin_unlock(&tiqn->tiqn_state_lock);
83 spin_unlock(&tiqn_lock);
88 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
90 spin_lock(&tiqn->tiqn_state_lock);
91 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
92 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
93 spin_unlock(&tiqn->tiqn_state_lock);
96 spin_unlock(&tiqn->tiqn_state_lock);
101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
103 spin_lock(&tiqn->tiqn_state_lock);
104 tiqn->tiqn_access_count--;
105 spin_unlock(&tiqn->tiqn_state_lock);
109 * Note that IQN formatting is expected to be done in userspace, and
110 * no explict IQN format checks are done here.
112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
114 struct iscsi_tiqn *tiqn = NULL;
117 if (strlen(buf) >= ISCSI_IQN_LEN) {
118 pr_err("Target IQN exceeds %d bytes\n",
120 return ERR_PTR(-EINVAL);
123 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
125 return ERR_PTR(-ENOMEM);
127 sprintf(tiqn->tiqn, "%s", buf);
128 INIT_LIST_HEAD(&tiqn->tiqn_list);
129 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
130 spin_lock_init(&tiqn->tiqn_state_lock);
131 spin_lock_init(&tiqn->tiqn_tpg_lock);
132 spin_lock_init(&tiqn->sess_err_stats.lock);
133 spin_lock_init(&tiqn->login_stats.lock);
134 spin_lock_init(&tiqn->logout_stats.lock);
136 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
138 idr_preload(GFP_KERNEL);
139 spin_lock(&tiqn_lock);
141 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
143 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
144 spin_unlock(&tiqn_lock);
149 tiqn->tiqn_index = ret;
150 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
152 spin_unlock(&tiqn_lock);
155 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
164 * Wait for accesses to said struct iscsi_tiqn to end.
166 spin_lock(&tiqn->tiqn_state_lock);
167 while (tiqn->tiqn_access_count != 0) {
168 spin_unlock(&tiqn->tiqn_state_lock);
170 spin_lock(&tiqn->tiqn_state_lock);
172 spin_unlock(&tiqn->tiqn_state_lock);
175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
178 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
179 * while holding tiqn->tiqn_state_lock. This means that all subsequent
180 * attempts to access this struct iscsi_tiqn will fail from both transport
181 * fabric and control code paths.
183 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
184 pr_err("iscsit_set_tiqn_shutdown() failed\n");
188 iscsit_wait_for_tiqn(tiqn);
190 spin_lock(&tiqn_lock);
191 list_del(&tiqn->tiqn_list);
192 idr_remove(&tiqn_idr, tiqn->tiqn_index);
193 spin_unlock(&tiqn_lock);
195 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
204 * Determine if the network portal is accepting storage traffic.
206 spin_lock_bh(&np->np_thread_lock);
207 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
208 spin_unlock_bh(&np->np_thread_lock);
211 spin_unlock_bh(&np->np_thread_lock);
213 * Determine if the portal group is accepting storage traffic.
215 spin_lock_bh(&tpg->tpg_state_lock);
216 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
217 spin_unlock_bh(&tpg->tpg_state_lock);
220 spin_unlock_bh(&tpg->tpg_state_lock);
223 * Here we serialize access across the TIQN+TPG Tuple.
225 ret = down_interruptible(&tpg->np_login_sem);
229 spin_lock_bh(&tpg->tpg_state_lock);
230 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
231 spin_unlock_bh(&tpg->tpg_state_lock);
232 up(&tpg->np_login_sem);
235 spin_unlock_bh(&tpg->tpg_state_lock);
240 void iscsit_login_kref_put(struct kref *kref)
242 struct iscsi_tpg_np *tpg_np = container_of(kref,
243 struct iscsi_tpg_np, tpg_np_kref);
245 complete(&tpg_np->tpg_np_comp);
248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
249 struct iscsi_tpg_np *tpg_np)
251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
253 up(&tpg->np_login_sem);
256 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
259 iscsit_put_tiqn_for_login(tiqn);
264 bool iscsit_check_np_match(
265 struct sockaddr_storage *sockaddr,
267 int network_transport)
269 struct sockaddr_in *sock_in, *sock_in_e;
270 struct sockaddr_in6 *sock_in6, *sock_in6_e;
271 bool ip_match = false;
274 if (sockaddr->ss_family == AF_INET6) {
275 sock_in6 = (struct sockaddr_in6 *)sockaddr;
276 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
278 if (!memcmp(&sock_in6->sin6_addr.in6_u,
279 &sock_in6_e->sin6_addr.in6_u,
280 sizeof(struct in6_addr)))
283 port = ntohs(sock_in6->sin6_port);
284 port_e = ntohs(sock_in6_e->sin6_port);
286 sock_in = (struct sockaddr_in *)sockaddr;
287 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
289 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
292 port = ntohs(sock_in->sin_port);
293 port_e = ntohs(sock_in_e->sin_port);
296 if (ip_match && (port_e == port) &&
297 (np->np_network_transport == network_transport))
303 static struct iscsi_np *iscsit_get_np(
304 struct sockaddr_storage *sockaddr,
305 int network_transport)
310 lockdep_assert_held(&np_lock);
312 list_for_each_entry(np, &g_np_list, np_list) {
313 spin_lock_bh(&np->np_thread_lock);
314 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
315 spin_unlock_bh(&np->np_thread_lock);
319 match = iscsit_check_np_match(sockaddr, np, network_transport);
322 * Increment the np_exports reference count now to
323 * prevent iscsit_del_np() below from being called
324 * while iscsi_tpg_add_network_portal() is called.
327 spin_unlock_bh(&np->np_thread_lock);
330 spin_unlock_bh(&np->np_thread_lock);
336 struct iscsi_np *iscsit_add_np(
337 struct sockaddr_storage *sockaddr,
338 int network_transport)
343 mutex_lock(&np_lock);
346 * Locate the existing struct iscsi_np if already active..
348 np = iscsit_get_np(sockaddr, network_transport);
350 mutex_unlock(&np_lock);
354 np = kzalloc(sizeof(*np), GFP_KERNEL);
356 mutex_unlock(&np_lock);
357 return ERR_PTR(-ENOMEM);
360 np->np_flags |= NPF_IP_NETWORK;
361 np->np_network_transport = network_transport;
362 spin_lock_init(&np->np_thread_lock);
363 init_completion(&np->np_restart_comp);
364 INIT_LIST_HEAD(&np->np_list);
366 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
368 ret = iscsi_target_setup_login_socket(np, sockaddr);
371 mutex_unlock(&np_lock);
375 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
376 if (IS_ERR(np->np_thread)) {
377 pr_err("Unable to create kthread: iscsi_np\n");
378 ret = PTR_ERR(np->np_thread);
380 mutex_unlock(&np_lock);
384 * Increment the np_exports reference count now to prevent
385 * iscsit_del_np() below from being run while a new call to
386 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
387 * active. We don't need to hold np->np_thread_lock at this
388 * point because iscsi_np has not been added to g_np_list yet.
391 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
393 list_add_tail(&np->np_list, &g_np_list);
394 mutex_unlock(&np_lock);
396 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
397 &np->np_sockaddr, np->np_transport->name);
402 int iscsit_reset_np_thread(
404 struct iscsi_tpg_np *tpg_np,
405 struct iscsi_portal_group *tpg,
408 spin_lock_bh(&np->np_thread_lock);
409 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
410 spin_unlock_bh(&np->np_thread_lock);
413 np->np_thread_state = ISCSI_NP_THREAD_RESET;
414 atomic_inc(&np->np_reset_count);
417 spin_unlock_bh(&np->np_thread_lock);
418 send_sig(SIGINT, np->np_thread, 1);
419 wait_for_completion(&np->np_restart_comp);
420 spin_lock_bh(&np->np_thread_lock);
422 spin_unlock_bh(&np->np_thread_lock);
424 if (tpg_np && shutdown) {
425 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
427 wait_for_completion(&tpg_np->tpg_np_comp);
433 static void iscsit_free_np(struct iscsi_np *np)
436 sock_release(np->np_socket);
439 int iscsit_del_np(struct iscsi_np *np)
441 spin_lock_bh(&np->np_thread_lock);
443 if (np->np_exports) {
445 spin_unlock_bh(&np->np_thread_lock);
448 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
449 spin_unlock_bh(&np->np_thread_lock);
453 * We need to send the signal to wakeup Linux/Net
454 * which may be sleeping in sock_accept()..
456 send_sig(SIGINT, np->np_thread, 1);
457 kthread_stop(np->np_thread);
458 np->np_thread = NULL;
461 np->np_transport->iscsit_free_np(np);
463 mutex_lock(&np_lock);
464 list_del(&np->np_list);
465 mutex_unlock(&np_lock);
467 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
468 &np->np_sockaddr, np->np_transport->name);
470 iscsit_put_transport(np->np_transport);
475 static void iscsit_get_rx_pdu(struct iscsi_conn *);
477 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
479 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
481 EXPORT_SYMBOL(iscsit_queue_rsp);
483 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
485 spin_lock_bh(&conn->cmd_lock);
486 if (!list_empty(&cmd->i_conn_node) &&
487 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
488 list_del_init(&cmd->i_conn_node);
489 spin_unlock_bh(&conn->cmd_lock);
491 __iscsit_free_cmd(cmd, true);
493 EXPORT_SYMBOL(iscsit_aborted_task);
495 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
496 u32, u32, const void *, void *);
497 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
500 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
501 const void *data_buf, u32 data_buf_len)
503 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
505 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
508 iov = &cmd->iov_misc[0];
509 iov[niov].iov_base = cmd->pdu;
510 iov[niov++].iov_len = ISCSI_HDR_LEN;
512 if (conn->conn_ops->HeaderDigest) {
513 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
515 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
516 ISCSI_HDR_LEN, 0, NULL,
519 iov[0].iov_len += ISCSI_CRC_LEN;
520 tx_size += ISCSI_CRC_LEN;
521 pr_debug("Attaching CRC32C HeaderDigest"
522 " to opcode 0x%x 0x%08x\n",
523 hdr->opcode, *header_digest);
527 u32 padding = ((-data_buf_len) & 3);
529 iov[niov].iov_base = (void *)data_buf;
530 iov[niov++].iov_len = data_buf_len;
531 tx_size += data_buf_len;
534 iov[niov].iov_base = &cmd->pad_bytes;
535 iov[niov++].iov_len = padding;
537 pr_debug("Attaching %u additional"
538 " padding bytes.\n", padding);
541 if (conn->conn_ops->DataDigest) {
542 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
543 data_buf, data_buf_len,
544 padding, &cmd->pad_bytes,
547 iov[niov].iov_base = &cmd->data_crc;
548 iov[niov++].iov_len = ISCSI_CRC_LEN;
549 tx_size += ISCSI_CRC_LEN;
550 pr_debug("Attached DataDigest for %u"
551 " bytes opcode 0x%x, CRC 0x%08x\n",
552 data_buf_len, hdr->opcode, cmd->data_crc);
556 cmd->iov_misc_count = niov;
557 cmd->tx_size = tx_size;
559 ret = iscsit_send_tx_data(cmd, conn, 1);
561 iscsit_tx_thread_wait_for_tcp(conn);
568 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
569 u32 data_offset, u32 data_length);
570 static void iscsit_unmap_iovec(struct iscsi_cmd *);
571 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
572 u32, u32, u32, u8 *);
574 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
575 const struct iscsi_datain *datain)
578 u32 iov_count = 0, tx_size = 0;
581 iov = &cmd->iov_data[0];
582 iov[iov_count].iov_base = cmd->pdu;
583 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
584 tx_size += ISCSI_HDR_LEN;
586 if (conn->conn_ops->HeaderDigest) {
587 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
589 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
590 ISCSI_HDR_LEN, 0, NULL,
593 iov[0].iov_len += ISCSI_CRC_LEN;
594 tx_size += ISCSI_CRC_LEN;
596 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
600 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
601 cmd->orig_iov_data_count - (iov_count + 2),
602 datain->offset, datain->length);
606 iov_count += iov_ret;
607 tx_size += datain->length;
609 cmd->padding = ((-datain->length) & 3);
611 iov[iov_count].iov_base = cmd->pad_bytes;
612 iov[iov_count++].iov_len = cmd->padding;
613 tx_size += cmd->padding;
615 pr_debug("Attaching %u padding bytes\n", cmd->padding);
618 if (conn->conn_ops->DataDigest) {
619 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
625 iov[iov_count].iov_base = &cmd->data_crc;
626 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
627 tx_size += ISCSI_CRC_LEN;
629 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
630 datain->length + cmd->padding, cmd->data_crc);
633 cmd->iov_data_count = iov_count;
634 cmd->tx_size = tx_size;
636 ret = iscsit_fe_sendpage_sg(cmd, conn);
638 iscsit_unmap_iovec(cmd);
641 iscsit_tx_thread_wait_for_tcp(conn);
648 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
649 struct iscsi_datain_req *dr, const void *buf,
653 return iscsit_xmit_datain_pdu(conn, cmd, buf);
655 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
658 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
660 return TARGET_PROT_NORMAL;
663 static struct iscsit_transport iscsi_target_transport = {
665 .transport_type = ISCSI_TCP,
666 .rdma_shutdown = false,
668 .iscsit_setup_np = iscsit_setup_np,
669 .iscsit_accept_np = iscsit_accept_np,
670 .iscsit_free_np = iscsit_free_np,
671 .iscsit_get_login_rx = iscsit_get_login_rx,
672 .iscsit_put_login_tx = iscsit_put_login_tx,
673 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
674 .iscsit_immediate_queue = iscsit_immediate_queue,
675 .iscsit_response_queue = iscsit_response_queue,
676 .iscsit_queue_data_in = iscsit_queue_rsp,
677 .iscsit_queue_status = iscsit_queue_rsp,
678 .iscsit_aborted_task = iscsit_aborted_task,
679 .iscsit_xmit_pdu = iscsit_xmit_pdu,
680 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
681 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
684 static int __init iscsi_target_init_module(void)
688 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
689 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
693 spin_lock_init(&iscsit_global->ts_bitmap_lock);
694 mutex_init(&auth_id_lock);
697 ret = target_register_template(&iscsi_ops);
701 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
702 iscsit_global->ts_bitmap = vzalloc(size);
703 if (!iscsit_global->ts_bitmap)
706 lio_qr_cache = kmem_cache_create("lio_qr_cache",
707 sizeof(struct iscsi_queue_req),
708 __alignof__(struct iscsi_queue_req), 0, NULL);
710 pr_err("Unable to kmem_cache_create() for"
715 lio_dr_cache = kmem_cache_create("lio_dr_cache",
716 sizeof(struct iscsi_datain_req),
717 __alignof__(struct iscsi_datain_req), 0, NULL);
719 pr_err("Unable to kmem_cache_create() for"
724 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
725 sizeof(struct iscsi_ooo_cmdsn),
726 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
727 if (!lio_ooo_cache) {
728 pr_err("Unable to kmem_cache_create() for"
733 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
734 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
736 if (!lio_r2t_cache) {
737 pr_err("Unable to kmem_cache_create() for"
742 iscsit_register_transport(&iscsi_target_transport);
744 if (iscsit_load_discovery_tpg() < 0)
749 iscsit_unregister_transport(&iscsi_target_transport);
750 kmem_cache_destroy(lio_r2t_cache);
752 kmem_cache_destroy(lio_ooo_cache);
754 kmem_cache_destroy(lio_dr_cache);
756 kmem_cache_destroy(lio_qr_cache);
758 vfree(iscsit_global->ts_bitmap);
760 /* XXX: this probably wants it to be it's own unwind step.. */
761 if (iscsit_global->discovery_tpg)
762 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
763 target_unregister_template(&iscsi_ops);
765 kfree(iscsit_global);
769 static void __exit iscsi_target_cleanup_module(void)
771 iscsit_release_discovery_tpg();
772 iscsit_unregister_transport(&iscsi_target_transport);
773 kmem_cache_destroy(lio_qr_cache);
774 kmem_cache_destroy(lio_dr_cache);
775 kmem_cache_destroy(lio_ooo_cache);
776 kmem_cache_destroy(lio_r2t_cache);
779 * Shutdown discovery sessions and disable discovery TPG
781 if (iscsit_global->discovery_tpg)
782 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
784 target_unregister_template(&iscsi_ops);
786 vfree(iscsit_global->ts_bitmap);
787 kfree(iscsit_global);
790 int iscsit_add_reject(
791 struct iscsi_conn *conn,
795 struct iscsi_cmd *cmd;
797 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
801 cmd->iscsi_opcode = ISCSI_OP_REJECT;
802 cmd->reject_reason = reason;
804 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
806 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
807 iscsit_free_cmd(cmd, false);
811 spin_lock_bh(&conn->cmd_lock);
812 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
813 spin_unlock_bh(&conn->cmd_lock);
815 cmd->i_state = ISTATE_SEND_REJECT;
816 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
820 EXPORT_SYMBOL(iscsit_add_reject);
822 static int iscsit_add_reject_from_cmd(
823 struct iscsi_cmd *cmd,
828 struct iscsi_conn *conn;
829 const bool do_put = cmd->se_cmd.se_tfo != NULL;
832 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
838 cmd->iscsi_opcode = ISCSI_OP_REJECT;
839 cmd->reject_reason = reason;
841 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
843 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
844 iscsit_free_cmd(cmd, false);
849 spin_lock_bh(&conn->cmd_lock);
850 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
851 spin_unlock_bh(&conn->cmd_lock);
854 cmd->i_state = ISTATE_SEND_REJECT;
855 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
857 * Perform the kref_put now if se_cmd has already been setup by
858 * scsit_setup_scsi_cmd()
861 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
862 target_put_sess_cmd(&cmd->se_cmd);
867 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
870 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
873 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
875 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
877 EXPORT_SYMBOL(iscsit_reject_cmd);
880 * Map some portion of the allocated scatterlist to an iovec, suitable for
881 * kernel sockets to copy data in/out.
883 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
884 u32 data_offset, u32 data_length)
886 u32 i = 0, orig_data_length = data_length;
887 struct scatterlist *sg;
888 unsigned int page_off;
891 * We know each entry in t_data_sg contains a page.
893 u32 ent = data_offset / PAGE_SIZE;
898 if (ent >= cmd->se_cmd.t_data_nents) {
899 pr_err("Initial page entry out-of-bounds\n");
903 sg = &cmd->se_cmd.t_data_sg[ent];
904 page_off = (data_offset % PAGE_SIZE);
906 cmd->first_data_sg = sg;
907 cmd->first_data_sg_off = page_off;
909 while (data_length) {
912 if (WARN_ON_ONCE(!sg || i >= nvec))
915 cur_len = min_t(u32, data_length, sg->length - page_off);
917 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
918 iov[i].iov_len = cur_len;
920 data_length -= cur_len;
926 cmd->kmapped_nents = i;
931 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
932 data_offset, orig_data_length, i, nvec);
933 for_each_sg(cmd->se_cmd.t_data_sg, sg,
934 cmd->se_cmd.t_data_nents, i) {
935 pr_err("[%d] off %d len %d\n",
936 i, sg->offset, sg->length);
941 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
944 struct scatterlist *sg;
946 sg = cmd->first_data_sg;
948 for (i = 0; i < cmd->kmapped_nents; i++)
949 kunmap(sg_page(&sg[i]));
952 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
955 struct iscsi_cmd *cmd, *cmd_p;
957 conn->exp_statsn = exp_statsn;
959 if (conn->sess->sess_ops->RDMAExtensions)
962 spin_lock_bh(&conn->cmd_lock);
963 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
964 spin_lock(&cmd->istate_lock);
965 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
966 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
967 cmd->i_state = ISTATE_REMOVE;
968 spin_unlock(&cmd->istate_lock);
969 list_move_tail(&cmd->i_conn_node, &ack_list);
972 spin_unlock(&cmd->istate_lock);
974 spin_unlock_bh(&conn->cmd_lock);
976 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
977 list_del_init(&cmd->i_conn_node);
978 iscsit_free_cmd(cmd, false);
982 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
984 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
986 iov_count += ISCSI_IOV_DATA_BUFFER;
987 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
991 cmd->orig_iov_data_count = iov_count;
995 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
998 int data_direction, payload_length;
999 struct iscsi_scsi_req *hdr;
1000 int iscsi_task_attr;
1003 atomic_long_inc(&conn->sess->cmd_pdus);
1005 hdr = (struct iscsi_scsi_req *) buf;
1006 payload_length = ntoh24(hdr->dlength);
1008 /* FIXME; Add checks for AdditionalHeaderSegment */
1010 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1011 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1012 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1013 " not set. Bad iSCSI Initiator.\n");
1014 return iscsit_add_reject_cmd(cmd,
1015 ISCSI_REASON_BOOKMARK_INVALID, buf);
1018 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1019 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1021 * From RFC-3720 Section 10.3.1:
1023 * "Either or both of R and W MAY be 1 when either the
1024 * Expected Data Transfer Length and/or Bidirectional Read
1025 * Expected Data Transfer Length are 0"
1027 * For this case, go ahead and clear the unnecssary bits
1028 * to avoid any confusion with ->data_direction.
1030 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1031 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1033 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1034 " set when Expected Data Transfer Length is 0 for"
1035 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1038 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1040 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1041 " MUST be set if Expected Data Transfer Length is not 0."
1042 " Bad iSCSI Initiator\n");
1043 return iscsit_add_reject_cmd(cmd,
1044 ISCSI_REASON_BOOKMARK_INVALID, buf);
1047 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1048 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1049 pr_err("Bidirectional operations not supported!\n");
1050 return iscsit_add_reject_cmd(cmd,
1051 ISCSI_REASON_BOOKMARK_INVALID, buf);
1054 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1055 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1056 " Scsi Command PDU.\n");
1057 return iscsit_add_reject_cmd(cmd,
1058 ISCSI_REASON_BOOKMARK_INVALID, buf);
1061 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1062 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1063 " protocol error.\n", payload_length);
1064 return iscsit_add_reject_cmd(cmd,
1065 ISCSI_REASON_PROTOCOL_ERROR, buf);
1068 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1069 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1070 pr_err("Expected Data Transfer Length and Length of"
1071 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1072 " bit is not set protocol error\n");
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1077 if (payload_length > be32_to_cpu(hdr->data_length)) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " EDTL: %u, protocol error.\n", payload_length,
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1085 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1088 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_PROTOCOL_ERROR, buf);
1093 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1094 pr_err("DataSegmentLength: %u is greater than"
1095 " FirstBurstLength: %u, protocol error.\n",
1096 payload_length, conn->sess->sess_ops->FirstBurstLength);
1097 return iscsit_add_reject_cmd(cmd,
1098 ISCSI_REASON_BOOKMARK_INVALID, buf);
1101 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1102 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1105 cmd->data_direction = data_direction;
1106 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1108 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1110 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1111 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1112 sam_task_attr = TCM_SIMPLE_TAG;
1113 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1114 sam_task_attr = TCM_ORDERED_TAG;
1115 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1116 sam_task_attr = TCM_HEAD_TAG;
1117 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1118 sam_task_attr = TCM_ACA_TAG;
1120 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1121 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1122 sam_task_attr = TCM_SIMPLE_TAG;
1125 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1126 cmd->i_state = ISTATE_NEW_CMD;
1127 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1128 cmd->immediate_data = (payload_length) ? 1 : 0;
1129 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1130 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1131 if (cmd->unsolicited_data)
1132 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1134 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1135 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1136 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1138 cmd->targ_xfer_tag = 0xFFFFFFFF;
1139 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1140 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1141 cmd->first_burst_len = payload_length;
1143 if (!conn->sess->sess_ops->RDMAExtensions &&
1144 cmd->data_direction == DMA_FROM_DEVICE) {
1145 struct iscsi_datain_req *dr;
1147 dr = iscsit_allocate_datain_req();
1149 return iscsit_add_reject_cmd(cmd,
1150 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1152 iscsit_attach_datain_req(cmd, dr);
1156 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1158 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1159 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1160 cmd->data_direction, sam_task_attr,
1161 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1163 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1164 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1165 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1168 target_get_sess_cmd(&cmd->se_cmd, true);
1170 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb);
1171 if (cmd->sense_reason) {
1172 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1173 return iscsit_add_reject_cmd(cmd,
1174 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1180 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1181 if (cmd->sense_reason)
1184 /* only used for printks or comparing with ->ref_task_tag */
1185 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1186 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1187 if (cmd->sense_reason)
1190 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1191 return iscsit_add_reject_cmd(cmd,
1192 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1196 spin_lock_bh(&conn->cmd_lock);
1197 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1198 spin_unlock_bh(&conn->cmd_lock);
1200 * Check if we need to delay processing because of ALUA
1201 * Active/NonOptimized primary access state..
1203 core_alua_check_nonop_delay(&cmd->se_cmd);
1207 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1209 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1211 iscsit_set_dataout_sequence_values(cmd);
1213 spin_lock_bh(&cmd->dataout_timeout_lock);
1214 iscsit_start_dataout_timer(cmd, cmd->conn);
1215 spin_unlock_bh(&cmd->dataout_timeout_lock);
1217 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1219 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1220 struct iscsi_scsi_req *hdr)
1224 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1225 * the Immediate Bit is not set, and no Immediate
1228 * A PDU/CmdSN carrying Immediate Data can only
1229 * be processed after the DataCRC has passed.
1230 * If the DataCRC fails, the CmdSN MUST NOT
1231 * be acknowledged. (See below)
1233 if (!cmd->immediate_data) {
1234 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1235 (unsigned char *)hdr, hdr->cmdsn);
1236 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1238 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1239 target_put_sess_cmd(&cmd->se_cmd);
1244 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1247 * If no Immediate Data is attached, it's OK to return now.
1249 if (!cmd->immediate_data) {
1250 if (!cmd->sense_reason && cmd->unsolicited_data)
1251 iscsit_set_unsolicited_dataout(cmd);
1252 if (!cmd->sense_reason)
1255 target_put_sess_cmd(&cmd->se_cmd);
1260 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1261 * execution. These exceptions are processed in CmdSN order using
1262 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1264 if (cmd->sense_reason)
1267 * Call directly into transport_generic_new_cmd() to perform
1268 * the backend memory allocation.
1270 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1271 if (cmd->sense_reason)
1276 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1279 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1282 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1286 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1289 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1290 cmd->first_burst_len);
1292 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1293 cmd->se_cmd.data_length, cmd->write_data_done,
1294 cmd->first_burst_len, length);
1295 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1296 pr_debug("Finished dumping immediate data\n");
1298 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1300 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1301 cmd->first_burst_len);
1304 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1306 * A PDU/CmdSN carrying Immediate Data passed
1307 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1308 * Immediate Bit is not set.
1310 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1311 (unsigned char *)hdr, hdr->cmdsn);
1312 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1315 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1316 target_put_sess_cmd(&cmd->se_cmd);
1319 } else if (cmd->unsolicited_data)
1320 iscsit_set_unsolicited_dataout(cmd);
1322 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1324 * Immediate Data failed DataCRC and ERL>=1,
1325 * silently drop this PDU and let the initiator
1326 * plug the CmdSN gap.
1328 * FIXME: Send Unsolicited NOPIN with reserved
1329 * TTT here to help the initiator figure out
1330 * the missing CmdSN, although they should be
1331 * intelligent enough to determine the missing
1332 * CmdSN and issue a retry to plug the sequence.
1334 cmd->i_state = ISTATE_REMOVE;
1335 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1336 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1343 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1346 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1348 bool dump_payload = false;
1350 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1354 * Allocation iovecs needed for struct socket operations for
1355 * traditional iSCSI block I/O.
1357 if (iscsit_allocate_iovecs(cmd) < 0) {
1358 return iscsit_reject_cmd(cmd,
1359 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1361 immed_data = cmd->immediate_data;
1363 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1367 dump_payload = true;
1372 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1375 static u32 iscsit_do_crypto_hash_sg(
1376 struct ahash_request *hash,
1377 struct iscsi_cmd *cmd,
1384 struct scatterlist *sg;
1385 unsigned int page_off;
1387 crypto_ahash_init(hash);
1389 sg = cmd->first_data_sg;
1390 page_off = cmd->first_data_sg_off;
1392 while (data_length) {
1393 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1395 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1396 crypto_ahash_update(hash);
1398 data_length -= cur_len;
1400 /* iscsit_map_iovec has already checked for invalid sg pointers */
1405 struct scatterlist pad_sg;
1407 sg_init_one(&pad_sg, pad_bytes, padding);
1408 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1410 crypto_ahash_finup(hash);
1412 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1413 crypto_ahash_final(hash);
1419 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1420 const void *buf, u32 payload_length, u32 padding,
1421 const void *pad_bytes, void *data_crc)
1423 struct scatterlist sg[2];
1425 sg_init_table(sg, ARRAY_SIZE(sg));
1426 sg_set_buf(sg, buf, payload_length);
1428 sg_set_buf(sg + 1, pad_bytes, padding);
1430 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1432 crypto_ahash_digest(hash);
1436 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1437 struct iscsi_cmd *cmd, u32 payload_length,
1440 struct iscsi_data *hdr = buf;
1441 struct se_cmd *se_cmd;
1445 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1447 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1448 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1449 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1450 payload_length, conn->cid);
1452 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1453 pr_err("Command ITT: 0x%08x received DataOUT after"
1454 " last DataOUT received, dumping payload\n",
1455 cmd->init_task_tag);
1456 return iscsit_dump_data_payload(conn, payload_length, 1);
1459 if (cmd->data_direction != DMA_TO_DEVICE) {
1460 pr_err("Command ITT: 0x%08x received DataOUT for a"
1461 " NON-WRITE command.\n", cmd->init_task_tag);
1462 return iscsit_dump_data_payload(conn, payload_length, 1);
1464 se_cmd = &cmd->se_cmd;
1465 iscsit_mod_dataout_timer(cmd);
1467 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1468 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1469 be32_to_cpu(hdr->offset), payload_length,
1470 cmd->se_cmd.data_length);
1471 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1474 if (cmd->unsolicited_data) {
1475 int dump_unsolicited_data = 0;
1477 if (conn->sess->sess_ops->InitialR2T) {
1478 pr_err("Received unexpected unsolicited data"
1479 " while InitialR2T=Yes, protocol error.\n");
1480 transport_send_check_condition_and_sense(&cmd->se_cmd,
1481 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1485 * Special case for dealing with Unsolicited DataOUT
1486 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1490 /* Something's amiss if we're not in WRITE_PENDING state... */
1491 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1492 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1493 dump_unsolicited_data = 1;
1495 if (dump_unsolicited_data) {
1497 * Check if a delayed TASK_ABORTED status needs to
1498 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1499 * received with the unsolicited data out.
1501 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1502 iscsit_stop_dataout_timer(cmd);
1504 return iscsit_dump_data_payload(conn, payload_length, 1);
1508 * For the normal solicited data path:
1510 * Check for a delayed TASK_ABORTED status and dump any
1511 * incoming data out payload if one exists. Also, when the
1512 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1513 * data out sequence, we decrement outstanding_r2ts. Once
1514 * outstanding_r2ts reaches zero, go ahead and send the delayed
1515 * TASK_ABORTED status.
1517 if (se_cmd->transport_state & CMD_T_ABORTED) {
1518 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1519 --cmd->outstanding_r2ts < 1)
1520 iscsit_stop_dataout_timer(cmd);
1522 return iscsit_dump_data_payload(conn, payload_length, 1);
1526 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1527 * within-command recovery checks before receiving the payload.
1529 rc = iscsit_check_pre_dataout(cmd, buf);
1530 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1532 else if (rc == DATAOUT_CANNOT_RECOVER)
1537 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1540 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1541 struct iscsi_cmd **out_cmd)
1543 struct iscsi_data *hdr = buf;
1544 struct iscsi_cmd *cmd;
1545 u32 payload_length = ntoh24(hdr->dlength);
1547 bool success = false;
1549 if (!payload_length) {
1550 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1554 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1555 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1556 " MaxXmitDataSegmentLength: %u\n", payload_length,
1557 conn->conn_ops->MaxXmitDataSegmentLength);
1558 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1561 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1565 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1572 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1575 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1576 struct iscsi_data *hdr)
1579 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1581 int iov_ret, data_crc_failed = 0;
1583 payload_length = min_t(u32, cmd->se_cmd.data_length,
1584 ntoh24(hdr->dlength));
1585 rx_size += payload_length;
1586 iov = &cmd->iov_data[0];
1588 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1589 be32_to_cpu(hdr->offset), payload_length);
1593 iov_count += iov_ret;
1595 padding = ((-payload_length) & 3);
1597 iov[iov_count].iov_base = cmd->pad_bytes;
1598 iov[iov_count++].iov_len = padding;
1600 pr_debug("Receiving %u padding bytes.\n", padding);
1603 if (conn->conn_ops->DataDigest) {
1604 iov[iov_count].iov_base = &checksum;
1605 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1606 rx_size += ISCSI_CRC_LEN;
1609 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1610 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1612 iscsit_unmap_iovec(cmd);
1614 if (rx_got != rx_size)
1617 if (conn->conn_ops->DataDigest) {
1620 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1621 be32_to_cpu(hdr->offset),
1622 payload_length, padding,
1625 if (checksum != data_crc) {
1626 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1627 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1628 " does not match computed 0x%08x\n",
1629 hdr->itt, hdr->offset, payload_length,
1630 hdr->datasn, checksum, data_crc);
1631 data_crc_failed = 1;
1633 pr_debug("Got CRC32C DataDigest 0x%08x for"
1634 " %u bytes of Data Out\n", checksum,
1639 return data_crc_failed;
1643 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1644 bool data_crc_failed)
1646 struct iscsi_conn *conn = cmd->conn;
1649 * Increment post receive data and CRC values or perform
1650 * within-command recovery.
1652 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1653 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1655 else if (rc == DATAOUT_SEND_R2T) {
1656 iscsit_set_dataout_sequence_values(cmd);
1657 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1658 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1660 * Handle extra special case for out of order
1661 * Unsolicited Data Out.
1663 spin_lock_bh(&cmd->istate_lock);
1664 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1665 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1666 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1667 spin_unlock_bh(&cmd->istate_lock);
1669 iscsit_stop_dataout_timer(cmd);
1672 target_execute_cmd(&cmd->se_cmd);
1674 } else /* DATAOUT_CANNOT_RECOVER */
1679 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1681 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1683 struct iscsi_cmd *cmd = NULL;
1684 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1686 bool data_crc_failed = false;
1688 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1694 rc = iscsit_get_dataout(conn, cmd, hdr);
1698 data_crc_failed = true;
1700 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1703 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1704 struct iscsi_nopout *hdr)
1706 u32 payload_length = ntoh24(hdr->dlength);
1708 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1709 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1711 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1712 (unsigned char *)hdr);
1714 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1715 (unsigned char *)hdr);
1718 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1719 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1720 " not set, protocol error.\n");
1722 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1723 (unsigned char *)hdr);
1725 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1726 (unsigned char *)hdr);
1729 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1730 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1731 " greater than MaxXmitDataSegmentLength: %u, protocol"
1732 " error.\n", payload_length,
1733 conn->conn_ops->MaxXmitDataSegmentLength);
1735 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1736 (unsigned char *)hdr);
1738 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1739 (unsigned char *)hdr);
1742 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1743 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1744 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1745 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1748 * This is not a response to a Unsolicited NopIN, which means
1749 * it can either be a NOPOUT ping request (with a valid ITT),
1750 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1751 * Either way, make sure we allocate an struct iscsi_cmd, as both
1752 * can contain ping data.
1754 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1755 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1756 cmd->i_state = ISTATE_SEND_NOPIN;
1757 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1759 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1760 cmd->targ_xfer_tag = 0xFFFFFFFF;
1761 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1762 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1763 cmd->data_direction = DMA_NONE;
1768 EXPORT_SYMBOL(iscsit_setup_nop_out);
1770 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1771 struct iscsi_nopout *hdr)
1773 struct iscsi_cmd *cmd_p = NULL;
1776 * Initiator is expecting a NopIN ping reply..
1778 if (hdr->itt != RESERVED_ITT) {
1780 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1781 (unsigned char *)hdr);
1783 spin_lock_bh(&conn->cmd_lock);
1784 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1785 spin_unlock_bh(&conn->cmd_lock);
1787 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1789 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1790 iscsit_add_cmd_to_response_queue(cmd, conn,
1795 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1796 (unsigned char *)hdr, hdr->cmdsn);
1797 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1799 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1805 * This was a response to a unsolicited NOPIN ping.
1807 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1808 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1812 iscsit_stop_nopin_response_timer(conn);
1814 cmd_p->i_state = ISTATE_REMOVE;
1815 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1817 iscsit_start_nopin_timer(conn);
1821 * Otherwise, initiator is not expecting a NOPIN is response.
1822 * Just ignore for now.
1826 iscsit_free_cmd(cmd, false);
1830 EXPORT_SYMBOL(iscsit_process_nop_out);
1832 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1835 unsigned char *ping_data = NULL;
1836 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1837 struct kvec *iov = NULL;
1838 u32 payload_length = ntoh24(hdr->dlength);
1841 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1845 * Handle NOP-OUT payload for traditional iSCSI sockets
1847 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1848 u32 checksum, data_crc, padding = 0;
1849 int niov = 0, rx_got, rx_size = payload_length;
1851 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1857 iov = &cmd->iov_misc[0];
1858 iov[niov].iov_base = ping_data;
1859 iov[niov++].iov_len = payload_length;
1861 padding = ((-payload_length) & 3);
1863 pr_debug("Receiving %u additional bytes"
1864 " for padding.\n", padding);
1865 iov[niov].iov_base = &cmd->pad_bytes;
1866 iov[niov++].iov_len = padding;
1869 if (conn->conn_ops->DataDigest) {
1870 iov[niov].iov_base = &checksum;
1871 iov[niov++].iov_len = ISCSI_CRC_LEN;
1872 rx_size += ISCSI_CRC_LEN;
1875 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1876 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1877 if (rx_got != rx_size) {
1882 if (conn->conn_ops->DataDigest) {
1883 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1884 payload_length, padding,
1885 cmd->pad_bytes, &data_crc);
1887 if (checksum != data_crc) {
1888 pr_err("Ping data CRC32C DataDigest"
1889 " 0x%08x does not match computed 0x%08x\n",
1890 checksum, data_crc);
1891 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1892 pr_err("Unable to recover from"
1893 " NOPOUT Ping DataCRC failure while in"
1899 * Silently drop this PDU and let the
1900 * initiator plug the CmdSN gap.
1902 pr_debug("Dropping NOPOUT"
1903 " Command CmdSN: 0x%08x due to"
1904 " DataCRC error.\n", hdr->cmdsn);
1909 pr_debug("Got CRC32C DataDigest"
1910 " 0x%08x for %u bytes of ping data.\n",
1911 checksum, payload_length);
1915 ping_data[payload_length] = '\0';
1917 * Attach ping data to struct iscsi_cmd->buf_ptr.
1919 cmd->buf_ptr = ping_data;
1920 cmd->buf_ptr_size = payload_length;
1922 pr_debug("Got %u bytes of NOPOUT ping"
1923 " data.\n", payload_length);
1924 pr_debug("Ping Data: \"%s\"\n", ping_data);
1927 return iscsit_process_nop_out(conn, cmd, hdr);
1930 iscsit_free_cmd(cmd, false);
1936 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1938 switch (iscsi_tmf) {
1939 case ISCSI_TM_FUNC_ABORT_TASK:
1940 return TMR_ABORT_TASK;
1941 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1942 return TMR_ABORT_TASK_SET;
1943 case ISCSI_TM_FUNC_CLEAR_ACA:
1944 return TMR_CLEAR_ACA;
1945 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1946 return TMR_CLEAR_TASK_SET;
1947 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1948 return TMR_LUN_RESET;
1949 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1950 return TMR_TARGET_WARM_RESET;
1951 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1952 return TMR_TARGET_COLD_RESET;
1959 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1962 struct se_tmr_req *se_tmr;
1963 struct iscsi_tmr_req *tmr_req;
1964 struct iscsi_tm *hdr;
1965 int out_of_order_cmdsn = 0, ret;
1966 u8 function, tcm_function = TMR_UNKNOWN;
1968 hdr = (struct iscsi_tm *) buf;
1969 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1970 function = hdr->flags;
1972 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1973 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1974 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1975 hdr->rtt, hdr->refcmdsn, conn->cid);
1977 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1978 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1979 hdr->rtt != RESERVED_ITT)) {
1980 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1981 hdr->rtt = RESERVED_ITT;
1984 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1985 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1986 pr_err("Task Management Request TASK_REASSIGN not"
1987 " issued as immediate command, bad iSCSI Initiator"
1988 "implementation\n");
1989 return iscsit_add_reject_cmd(cmd,
1990 ISCSI_REASON_PROTOCOL_ERROR, buf);
1992 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1993 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1994 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1996 cmd->data_direction = DMA_NONE;
1997 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1998 if (!cmd->tmr_req) {
1999 return iscsit_add_reject_cmd(cmd,
2000 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2004 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2005 conn->sess->se_sess, 0, DMA_NONE,
2006 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2007 scsilun_to_int(&hdr->lun));
2009 target_get_sess_cmd(&cmd->se_cmd, true);
2012 * TASK_REASSIGN for ERL=2 / connection stays inside of
2013 * LIO-Target $FABRIC_MOD
2015 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2016 tcm_function = iscsit_convert_tmf(function);
2017 if (tcm_function == TMR_UNKNOWN) {
2018 pr_err("Unknown iSCSI TMR Function:"
2019 " 0x%02x\n", function);
2020 return iscsit_add_reject_cmd(cmd,
2021 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2024 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2027 return iscsit_add_reject_cmd(cmd,
2028 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2030 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2032 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2033 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2034 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2035 cmd->init_task_tag = hdr->itt;
2036 cmd->targ_xfer_tag = 0xFFFFFFFF;
2037 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2038 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2039 se_tmr = cmd->se_cmd.se_tmr_req;
2040 tmr_req = cmd->tmr_req;
2042 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2044 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2045 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2047 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2053 case ISCSI_TM_FUNC_ABORT_TASK:
2054 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2055 if (se_tmr->response)
2058 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2059 case ISCSI_TM_FUNC_CLEAR_ACA:
2060 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2061 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2063 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2064 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2065 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2069 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2070 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2071 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2075 case ISCSI_TM_FUNC_TASK_REASSIGN:
2076 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2078 * Perform sanity checks on the ExpDataSN only if the
2079 * TASK_REASSIGN was successful.
2081 if (se_tmr->response)
2084 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2085 return iscsit_add_reject_cmd(cmd,
2086 ISCSI_REASON_BOOKMARK_INVALID, buf);
2089 pr_err("Unknown TMR function: 0x%02x, protocol"
2090 " error.\n", function);
2091 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2095 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2096 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2097 se_tmr->call_transport = 1;
2099 spin_lock_bh(&conn->cmd_lock);
2100 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2101 spin_unlock_bh(&conn->cmd_lock);
2103 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2104 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2105 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2106 out_of_order_cmdsn = 1;
2107 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2108 target_put_sess_cmd(&cmd->se_cmd);
2110 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2114 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2116 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2119 * Found the referenced task, send to transport for processing.
2121 if (se_tmr->call_transport)
2122 return transport_generic_handle_tmr(&cmd->se_cmd);
2125 * Could not find the referenced LUN, task, or Task Management
2126 * command not authorized or supported. Change state and
2127 * let the tx_thread send the response.
2129 * For connection recovery, this is also the default action for
2130 * TMR TASK_REASSIGN.
2132 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2133 target_put_sess_cmd(&cmd->se_cmd);
2136 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2138 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2140 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2141 struct iscsi_text *hdr)
2143 u32 payload_length = ntoh24(hdr->dlength);
2145 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2146 pr_err("Unable to accept text parameter length: %u"
2147 "greater than MaxXmitDataSegmentLength %u.\n",
2148 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2149 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2150 (unsigned char *)hdr);
2153 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2154 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2155 pr_err("Multi sequence text commands currently not supported\n");
2156 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2157 (unsigned char *)hdr);
2160 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2161 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2162 hdr->exp_statsn, payload_length);
2164 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2165 cmd->i_state = ISTATE_SEND_TEXTRSP;
2166 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2167 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2168 cmd->targ_xfer_tag = 0xFFFFFFFF;
2169 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2170 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2171 cmd->data_direction = DMA_NONE;
2172 kfree(cmd->text_in_ptr);
2173 cmd->text_in_ptr = NULL;
2177 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2180 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2181 struct iscsi_text *hdr)
2183 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2187 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2188 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2189 pr_err("Unable to locate text_in buffer for sendtargets"
2193 goto empty_sendtargets;
2195 if (strncmp("SendTargets=", text_in, 12) != 0) {
2196 pr_err("Received Text Data that is not"
2197 " SendTargets, cannot continue.\n");
2200 /* '=' confirmed in strncmp */
2201 text_ptr = strchr(text_in, '=');
2203 if (!strncmp("=All", text_ptr, 5)) {
2204 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2205 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2206 !strncmp("=eui.", text_ptr, 5)) {
2207 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2209 pr_err("Unable to locate valid SendTargets%s value\n",
2214 spin_lock_bh(&conn->cmd_lock);
2215 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2216 spin_unlock_bh(&conn->cmd_lock);
2219 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2221 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2222 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2223 (unsigned char *)hdr, hdr->cmdsn);
2224 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2230 return iscsit_execute_cmd(cmd, 0);
2233 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2234 (unsigned char *)hdr);
2236 EXPORT_SYMBOL(iscsit_process_text_cmd);
2239 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2242 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2243 char *text_in = NULL;
2244 u32 payload_length = ntoh24(hdr->dlength);
2247 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2251 rx_size = payload_length;
2252 if (payload_length) {
2253 u32 checksum = 0, data_crc = 0;
2255 int niov = 0, rx_got;
2258 rx_size = ALIGN(payload_length, 4);
2259 text_in = kzalloc(rx_size, GFP_KERNEL);
2263 cmd->text_in_ptr = text_in;
2265 memset(iov, 0, sizeof(iov));
2266 iov[niov].iov_base = text_in;
2267 iov[niov++].iov_len = rx_size;
2269 padding = rx_size - payload_length;
2271 pr_debug("Receiving %u additional bytes"
2272 " for padding.\n", padding);
2273 if (conn->conn_ops->DataDigest) {
2274 iov[niov].iov_base = &checksum;
2275 iov[niov++].iov_len = ISCSI_CRC_LEN;
2276 rx_size += ISCSI_CRC_LEN;
2279 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2280 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2281 if (rx_got != rx_size)
2284 if (conn->conn_ops->DataDigest) {
2285 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2286 text_in, rx_size, 0, NULL,
2289 if (checksum != data_crc) {
2290 pr_err("Text data CRC32C DataDigest"
2291 " 0x%08x does not match computed"
2292 " 0x%08x\n", checksum, data_crc);
2293 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2294 pr_err("Unable to recover from"
2295 " Text Data digest failure while in"
2300 * Silently drop this PDU and let the
2301 * initiator plug the CmdSN gap.
2303 pr_debug("Dropping Text"
2304 " Command CmdSN: 0x%08x due to"
2305 " DataCRC error.\n", hdr->cmdsn);
2310 pr_debug("Got CRC32C DataDigest"
2311 " 0x%08x for %u bytes of text data.\n",
2312 checksum, payload_length);
2315 text_in[payload_length - 1] = '\0';
2316 pr_debug("Successfully read %d bytes of text"
2317 " data.\n", payload_length);
2320 return iscsit_process_text_cmd(conn, cmd, hdr);
2323 kfree(cmd->text_in_ptr);
2324 cmd->text_in_ptr = NULL;
2325 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2328 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2330 struct iscsi_conn *conn_p;
2331 struct iscsi_session *sess = conn->sess;
2333 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2334 " for SID: %u.\n", conn->cid, conn->sess->sid);
2336 atomic_set(&sess->session_logout, 1);
2337 atomic_set(&conn->conn_logout_remove, 1);
2338 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2340 iscsit_inc_conn_usage_count(conn);
2341 iscsit_inc_session_usage_count(sess);
2343 spin_lock_bh(&sess->conn_lock);
2344 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2345 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2348 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2349 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2351 spin_unlock_bh(&sess->conn_lock);
2353 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2358 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2360 struct iscsi_conn *l_conn;
2361 struct iscsi_session *sess = conn->sess;
2363 pr_debug("Received logout request CLOSECONNECTION for CID:"
2364 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2367 * A Logout Request with a CLOSECONNECTION reason code for a CID
2368 * can arrive on a connection with a differing CID.
2370 if (conn->cid == cmd->logout_cid) {
2371 spin_lock_bh(&conn->state_lock);
2372 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2373 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2375 atomic_set(&conn->conn_logout_remove, 1);
2376 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2377 iscsit_inc_conn_usage_count(conn);
2379 spin_unlock_bh(&conn->state_lock);
2382 * Handle all different cid CLOSECONNECTION requests in
2383 * iscsit_logout_post_handler_diffcid() as to give enough
2384 * time for any non immediate command's CmdSN to be
2385 * acknowledged on the connection in question.
2387 * Here we simply make sure the CID is still around.
2389 l_conn = iscsit_get_conn_from_cid(sess,
2392 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2393 iscsit_add_cmd_to_response_queue(cmd, conn,
2398 iscsit_dec_conn_usage_count(l_conn);
2401 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2406 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2408 struct iscsi_session *sess = conn->sess;
2410 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2411 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2413 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2414 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2415 " while ERL!=2.\n");
2416 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2417 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2421 if (conn->cid == cmd->logout_cid) {
2422 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2423 " with CID: %hu on CID: %hu, implementation error.\n",
2424 cmd->logout_cid, conn->cid);
2425 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2426 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2430 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2436 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2439 int cmdsn_ret, logout_remove = 0;
2441 struct iscsi_logout *hdr;
2442 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2444 hdr = (struct iscsi_logout *) buf;
2445 reason_code = (hdr->flags & 0x7f);
2448 spin_lock(&tiqn->logout_stats.lock);
2449 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2450 tiqn->logout_stats.normal_logouts++;
2452 tiqn->logout_stats.abnormal_logouts++;
2453 spin_unlock(&tiqn->logout_stats.lock);
2456 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2457 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2458 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2459 hdr->cid, conn->cid);
2461 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2462 pr_err("Received logout request on connection that"
2463 " is not in logged in state, ignoring request.\n");
2464 iscsit_free_cmd(cmd, false);
2468 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2469 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2470 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2471 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2472 cmd->targ_xfer_tag = 0xFFFFFFFF;
2473 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2474 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2475 cmd->logout_cid = be16_to_cpu(hdr->cid);
2476 cmd->logout_reason = reason_code;
2477 cmd->data_direction = DMA_NONE;
2480 * We need to sleep in these cases (by returning 1) until the Logout
2481 * Response gets sent in the tx thread.
2483 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2484 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2485 be16_to_cpu(hdr->cid) == conn->cid))
2488 spin_lock_bh(&conn->cmd_lock);
2489 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2490 spin_unlock_bh(&conn->cmd_lock);
2492 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2493 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2496 * Immediate commands are executed, well, immediately.
2497 * Non-Immediate Logout Commands are executed in CmdSN order.
2499 if (cmd->immediate_cmd) {
2500 int ret = iscsit_execute_cmd(cmd, 0);
2505 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2506 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2508 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2512 return logout_remove;
2514 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2516 int iscsit_handle_snack(
2517 struct iscsi_conn *conn,
2520 struct iscsi_snack *hdr;
2522 hdr = (struct iscsi_snack *) buf;
2523 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2525 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2526 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2527 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2528 hdr->begrun, hdr->runlength, conn->cid);
2530 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2531 pr_err("Initiator sent SNACK request while in"
2532 " ErrorRecoveryLevel=0.\n");
2533 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2537 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2538 * call from inside iscsi_send_recovery_datain_or_r2t().
2540 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2542 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2544 be32_to_cpu(hdr->ttt),
2545 be32_to_cpu(hdr->begrun),
2546 be32_to_cpu(hdr->runlength));
2547 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2548 return iscsit_handle_status_snack(conn, hdr->itt,
2549 be32_to_cpu(hdr->ttt),
2550 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2551 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2552 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2553 be32_to_cpu(hdr->begrun),
2554 be32_to_cpu(hdr->runlength));
2555 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2556 /* FIXME: Support R-Data SNACK */
2557 pr_err("R-Data SNACK Not Supported.\n");
2558 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561 pr_err("Unknown SNACK type 0x%02x, protocol"
2562 " error.\n", hdr->flags & 0x0f);
2563 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2569 EXPORT_SYMBOL(iscsit_handle_snack);
2571 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2573 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2574 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2575 wait_for_completion_interruptible_timeout(
2576 &conn->rx_half_close_comp,
2577 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2581 static int iscsit_handle_immediate_data(
2582 struct iscsi_cmd *cmd,
2583 struct iscsi_scsi_req *hdr,
2586 int iov_ret, rx_got = 0, rx_size = 0;
2587 u32 checksum, iov_count = 0, padding = 0;
2588 struct iscsi_conn *conn = cmd->conn;
2590 void *overflow_buf = NULL;
2592 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2593 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2594 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2595 cmd->orig_iov_data_count - 2,
2596 cmd->write_data_done, rx_size);
2598 return IMMEDIATE_DATA_CANNOT_RECOVER;
2600 iov_count = iov_ret;
2601 iov = &cmd->iov_data[0];
2602 if (rx_size < length) {
2604 * Special case: length of immediate data exceeds the data
2605 * buffer size derived from the CDB.
2607 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2608 if (!overflow_buf) {
2609 iscsit_unmap_iovec(cmd);
2610 return IMMEDIATE_DATA_CANNOT_RECOVER;
2612 cmd->overflow_buf = overflow_buf;
2613 iov[iov_count].iov_base = overflow_buf;
2614 iov[iov_count].iov_len = length - rx_size;
2619 padding = ((-length) & 3);
2621 iov[iov_count].iov_base = cmd->pad_bytes;
2622 iov[iov_count++].iov_len = padding;
2626 if (conn->conn_ops->DataDigest) {
2627 iov[iov_count].iov_base = &checksum;
2628 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2629 rx_size += ISCSI_CRC_LEN;
2632 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2633 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2635 iscsit_unmap_iovec(cmd);
2637 if (rx_got != rx_size) {
2638 iscsit_rx_thread_wait_for_tcp(conn);
2639 return IMMEDIATE_DATA_CANNOT_RECOVER;
2642 if (conn->conn_ops->DataDigest) {
2645 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2646 cmd->write_data_done, length, padding,
2649 if (checksum != data_crc) {
2650 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2651 " does not match computed 0x%08x\n", checksum,
2654 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2655 pr_err("Unable to recover from"
2656 " Immediate Data digest failure while"
2658 iscsit_reject_cmd(cmd,
2659 ISCSI_REASON_DATA_DIGEST_ERROR,
2660 (unsigned char *)hdr);
2661 return IMMEDIATE_DATA_CANNOT_RECOVER;
2663 iscsit_reject_cmd(cmd,
2664 ISCSI_REASON_DATA_DIGEST_ERROR,
2665 (unsigned char *)hdr);
2666 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2669 pr_debug("Got CRC32C DataDigest 0x%08x for"
2670 " %u bytes of Immediate Data\n", checksum,
2675 cmd->write_data_done += length;
2677 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2678 spin_lock_bh(&cmd->istate_lock);
2679 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2680 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2681 spin_unlock_bh(&cmd->istate_lock);
2684 return IMMEDIATE_DATA_NORMAL_OPERATION;
2687 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2688 with active network interface */
2689 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2691 struct iscsi_cmd *cmd;
2692 struct iscsi_conn *conn_p;
2695 lockdep_assert_held(&conn->sess->conn_lock);
2698 * Only send a Asynchronous Message on connections whos network
2699 * interface is still functional.
2701 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2702 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2703 iscsit_inc_conn_usage_count(conn_p);
2712 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2714 iscsit_dec_conn_usage_count(conn_p);
2718 cmd->logout_cid = conn->cid;
2719 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2720 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2722 spin_lock_bh(&conn_p->cmd_lock);
2723 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2724 spin_unlock_bh(&conn_p->cmd_lock);
2726 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2727 iscsit_dec_conn_usage_count(conn_p);
2730 static int iscsit_send_conn_drop_async_message(
2731 struct iscsi_cmd *cmd,
2732 struct iscsi_conn *conn)
2734 struct iscsi_async *hdr;
2736 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2738 hdr = (struct iscsi_async *) cmd->pdu;
2739 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2740 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2741 cmd->init_task_tag = RESERVED_ITT;
2742 cmd->targ_xfer_tag = 0xFFFFFFFF;
2743 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2744 cmd->stat_sn = conn->stat_sn++;
2745 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2746 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2747 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2748 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2749 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2750 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2751 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2753 pr_debug("Sending Connection Dropped Async Message StatSN:"
2754 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2755 cmd->logout_cid, conn->cid);
2757 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2760 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2762 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2763 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2764 wait_for_completion_interruptible_timeout(
2765 &conn->tx_half_close_comp,
2766 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2771 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2772 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2775 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2776 hdr->flags = datain->flags;
2777 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2778 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2779 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2780 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2781 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2782 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2783 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2786 hton24(hdr->dlength, datain->length);
2787 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2788 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2789 (struct scsi_lun *)&hdr->lun);
2791 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2793 hdr->itt = cmd->init_task_tag;
2795 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2796 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2798 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2800 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2802 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2804 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2805 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2806 hdr->datasn = cpu_to_be32(datain->data_sn);
2807 hdr->offset = cpu_to_be32(datain->offset);
2809 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2810 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2811 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2812 ntohl(hdr->offset), datain->length, conn->cid);
2814 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2816 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2818 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2819 struct iscsi_datain datain;
2820 struct iscsi_datain_req *dr;
2822 bool set_statsn = false;
2824 memset(&datain, 0, sizeof(struct iscsi_datain));
2825 dr = iscsit_get_datain_values(cmd, &datain);
2827 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2828 cmd->init_task_tag);
2832 * Be paranoid and double check the logic for now.
2834 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2835 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2836 " datain.length: %u exceeds cmd->data_length: %u\n",
2837 cmd->init_task_tag, datain.offset, datain.length,
2838 cmd->se_cmd.data_length);
2842 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2844 * Special case for successfully execution w/ both DATAIN
2847 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2848 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2849 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2851 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2852 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2853 iscsit_increment_maxcmdsn(cmd, conn->sess);
2854 cmd->stat_sn = conn->stat_sn++;
2856 } else if (dr->dr_complete ==
2857 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2861 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2863 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2867 if (dr->dr_complete) {
2868 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2870 iscsit_free_datain_req(cmd, dr);
2877 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2878 struct iscsi_logout_rsp *hdr)
2880 struct iscsi_conn *logout_conn = NULL;
2881 struct iscsi_conn_recovery *cr = NULL;
2882 struct iscsi_session *sess = conn->sess;
2884 * The actual shutting down of Sessions and/or Connections
2885 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2886 * is done in scsi_logout_post_handler().
2888 switch (cmd->logout_reason) {
2889 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2890 pr_debug("iSCSI session logout successful, setting"
2891 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2892 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2894 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2895 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2898 * For CLOSECONNECTION logout requests carrying
2899 * a matching logout CID -> local CID, the reference
2900 * for the local CID will have been incremented in
2901 * iscsi_logout_closeconnection().
2903 * For CLOSECONNECTION logout requests carrying
2904 * a different CID than the connection it arrived
2905 * on, the connection responding to cmd->logout_cid
2906 * is stopped in iscsit_logout_post_handler_diffcid().
2909 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2910 " successful.\n", cmd->logout_cid, conn->cid);
2911 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2913 case ISCSI_LOGOUT_REASON_RECOVERY:
2914 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2915 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2918 * If the connection is still active from our point of view
2919 * force connection recovery to occur.
2921 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2924 iscsit_connection_reinstatement_rcfr(logout_conn);
2925 iscsit_dec_conn_usage_count(logout_conn);
2928 cr = iscsit_get_inactive_connection_recovery_entry(
2929 conn->sess, cmd->logout_cid);
2931 pr_err("Unable to locate CID: %hu for"
2932 " REMOVECONNFORRECOVERY Logout Request.\n",
2934 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2938 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2940 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2941 " for recovery for CID: %hu on CID: %hu successful.\n",
2942 cmd->logout_cid, conn->cid);
2943 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2946 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2947 cmd->logout_reason);
2951 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2952 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2953 hdr->response = cmd->logout_response;
2954 hdr->itt = cmd->init_task_tag;
2955 cmd->stat_sn = conn->stat_sn++;
2956 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2958 iscsit_increment_maxcmdsn(cmd, conn->sess);
2959 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2960 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2962 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2963 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2964 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2965 cmd->logout_cid, conn->cid);
2969 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2972 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2976 rc = iscsit_build_logout_rsp(cmd, conn,
2977 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2981 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2985 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2986 struct iscsi_nopin *hdr, bool nopout_response)
2988 hdr->opcode = ISCSI_OP_NOOP_IN;
2989 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2990 hton24(hdr->dlength, cmd->buf_ptr_size);
2991 if (nopout_response)
2992 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2993 hdr->itt = cmd->init_task_tag;
2994 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2995 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2997 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2999 if (nopout_response)
3000 iscsit_increment_maxcmdsn(cmd, conn->sess);
3002 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3003 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3005 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3006 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3007 "Solicited" : "Unsolicited", cmd->init_task_tag,
3008 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3010 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3013 * Unsolicited NOPIN, either requesting a response or not.
3015 static int iscsit_send_unsolicited_nopin(
3016 struct iscsi_cmd *cmd,
3017 struct iscsi_conn *conn,
3020 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3023 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3025 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3026 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3028 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3032 spin_lock_bh(&cmd->istate_lock);
3033 cmd->i_state = want_response ?
3034 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3035 spin_unlock_bh(&cmd->istate_lock);
3041 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3043 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3045 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3048 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3049 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3051 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3053 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3058 static int iscsit_send_r2t(
3059 struct iscsi_cmd *cmd,
3060 struct iscsi_conn *conn)
3062 struct iscsi_r2t *r2t;
3063 struct iscsi_r2t_rsp *hdr;
3066 r2t = iscsit_get_r2t_from_list(cmd);
3070 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3071 memset(hdr, 0, ISCSI_HDR_LEN);
3072 hdr->opcode = ISCSI_OP_R2T;
3073 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3074 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3075 (struct scsi_lun *)&hdr->lun);
3076 hdr->itt = cmd->init_task_tag;
3077 if (conn->conn_transport->iscsit_get_r2t_ttt)
3078 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3080 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3081 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3082 hdr->statsn = cpu_to_be32(conn->stat_sn);
3083 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3084 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3085 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3086 hdr->data_offset = cpu_to_be32(r2t->offset);
3087 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3089 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3090 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3091 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3092 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3093 r2t->offset, r2t->xfer_len, conn->cid);
3095 spin_lock_bh(&cmd->r2t_lock);
3097 spin_unlock_bh(&cmd->r2t_lock);
3099 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3104 spin_lock_bh(&cmd->dataout_timeout_lock);
3105 iscsit_start_dataout_timer(cmd, conn);
3106 spin_unlock_bh(&cmd->dataout_timeout_lock);
3112 * @recovery: If called from iscsi_task_reassign_complete_write() for
3113 * connection recovery.
3115 int iscsit_build_r2ts_for_cmd(
3116 struct iscsi_conn *conn,
3117 struct iscsi_cmd *cmd,
3121 u32 offset = 0, xfer_len = 0;
3123 spin_lock_bh(&cmd->r2t_lock);
3124 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3125 spin_unlock_bh(&cmd->r2t_lock);
3129 if (conn->sess->sess_ops->DataSequenceInOrder &&
3131 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3133 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3134 if (conn->sess->sess_ops->DataSequenceInOrder) {
3135 offset = cmd->r2t_offset;
3137 if (first_r2t && recovery) {
3138 int new_data_end = offset +
3139 conn->sess->sess_ops->MaxBurstLength -
3140 cmd->next_burst_len;
3142 if (new_data_end > cmd->se_cmd.data_length)
3143 xfer_len = cmd->se_cmd.data_length - offset;
3146 conn->sess->sess_ops->MaxBurstLength -
3147 cmd->next_burst_len;
3149 int new_data_end = offset +
3150 conn->sess->sess_ops->MaxBurstLength;
3152 if (new_data_end > cmd->se_cmd.data_length)
3153 xfer_len = cmd->se_cmd.data_length - offset;
3155 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3158 if ((s32)xfer_len < 0) {
3159 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3163 cmd->r2t_offset += xfer_len;
3165 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3166 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3168 struct iscsi_seq *seq;
3170 seq = iscsit_get_seq_holder_for_r2t(cmd);
3172 spin_unlock_bh(&cmd->r2t_lock);
3176 offset = seq->offset;
3177 xfer_len = seq->xfer_len;
3179 if (cmd->seq_send_order == cmd->seq_count)
3180 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3182 cmd->outstanding_r2ts++;
3185 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3186 spin_unlock_bh(&cmd->r2t_lock);
3190 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3193 spin_unlock_bh(&cmd->r2t_lock);
3197 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3199 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3200 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3203 cmd->stat_sn = conn->stat_sn++;
3205 atomic_long_inc(&conn->sess->rsp_pdus);
3207 memset(hdr, 0, ISCSI_HDR_LEN);
3208 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3209 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3210 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3211 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3212 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3213 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3214 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3215 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3217 hdr->response = cmd->iscsi_response;
3218 hdr->cmd_status = cmd->se_cmd.scsi_status;
3219 hdr->itt = cmd->init_task_tag;
3220 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3222 iscsit_increment_maxcmdsn(cmd, conn->sess);
3223 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3224 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3226 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3227 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3228 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3229 cmd->se_cmd.scsi_status, conn->cid);
3231 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3233 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3235 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3236 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3237 void *data_buf = NULL;
3238 u32 padding = 0, data_buf_len = 0;
3240 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3243 * Attach SENSE DATA payload to iSCSI Response PDU
3245 if (cmd->se_cmd.sense_buffer &&
3246 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3247 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3248 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3249 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3251 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3252 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3253 data_buf = cmd->sense_buffer;
3254 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3257 memset(cmd->sense_buffer +
3258 cmd->se_cmd.scsi_sense_length, 0, padding);
3259 pr_debug("Adding %u bytes of padding to"
3260 " SENSE.\n", padding);
3263 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3265 cmd->se_cmd.scsi_sense_length);
3268 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3272 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3274 switch (se_tmr->response) {
3275 case TMR_FUNCTION_COMPLETE:
3276 return ISCSI_TMF_RSP_COMPLETE;
3277 case TMR_TASK_DOES_NOT_EXIST:
3278 return ISCSI_TMF_RSP_NO_TASK;
3279 case TMR_LUN_DOES_NOT_EXIST:
3280 return ISCSI_TMF_RSP_NO_LUN;
3281 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3282 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3283 case TMR_FUNCTION_REJECTED:
3285 return ISCSI_TMF_RSP_REJECTED;
3290 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3291 struct iscsi_tm_rsp *hdr)
3293 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3295 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3296 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3297 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3298 hdr->itt = cmd->init_task_tag;
3299 cmd->stat_sn = conn->stat_sn++;
3300 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3302 iscsit_increment_maxcmdsn(cmd, conn->sess);
3303 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3304 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3306 pr_debug("Built Task Management Response ITT: 0x%08x,"
3307 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3308 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3310 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3313 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3315 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3317 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3319 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3322 #define SENDTARGETS_BUF_LIMIT 32768U
3325 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3326 enum iscsit_transport_type network_transport,
3327 int skip_bytes, bool *completed)
3329 char *payload = NULL;
3330 struct iscsi_conn *conn = cmd->conn;
3331 struct iscsi_portal_group *tpg;
3332 struct iscsi_tiqn *tiqn;
3333 struct iscsi_tpg_np *tpg_np;
3334 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3335 int target_name_printed;
3336 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3337 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3340 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3341 SENDTARGETS_BUF_LIMIT);
3343 payload = kzalloc(buffer_len, GFP_KERNEL);
3348 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3351 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3352 text_ptr = strchr(text_in, '=');
3354 pr_err("Unable to locate '=' string in text_in:"
3360 * Skip over '=' character..
3365 spin_lock(&tiqn_lock);
3366 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3367 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3368 strcmp(tiqn->tiqn, text_ptr)) {
3372 target_name_printed = 0;
3374 spin_lock(&tiqn->tiqn_tpg_lock);
3375 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3377 /* If demo_mode_discovery=0 and generate_node_acls=0
3378 * (demo mode dislabed) do not return
3379 * TargetName+TargetAddress unless a NodeACL exists.
3382 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3383 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3384 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3385 cmd->conn->sess->sess_ops->InitiatorName))) {
3389 spin_lock(&tpg->tpg_state_lock);
3390 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3391 spin_unlock(&tpg->tpg_state_lock);
3393 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3396 spin_lock(&tpg->tpg_np_lock);
3397 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3399 struct iscsi_np *np = tpg_np->tpg_np;
3400 struct sockaddr_storage *sockaddr;
3402 if (np->np_network_transport != network_transport)
3405 if (!target_name_printed) {
3406 len = sprintf(buf, "TargetName=%s",
3410 if ((len + payload_len) > buffer_len) {
3411 spin_unlock(&tpg->tpg_np_lock);
3412 spin_unlock(&tiqn->tiqn_tpg_lock);
3417 if (skip_bytes && len <= skip_bytes) {
3420 memcpy(payload + payload_len, buf, len);
3422 target_name_printed = 1;
3423 if (len > skip_bytes)
3428 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3429 sockaddr = &conn->local_sockaddr;
3431 sockaddr = &np->np_sockaddr;
3433 len = sprintf(buf, "TargetAddress="
3439 if ((len + payload_len) > buffer_len) {
3440 spin_unlock(&tpg->tpg_np_lock);
3441 spin_unlock(&tiqn->tiqn_tpg_lock);
3446 if (skip_bytes && len <= skip_bytes) {
3449 memcpy(payload + payload_len, buf, len);
3451 if (len > skip_bytes)
3455 spin_unlock(&tpg->tpg_np_lock);
3457 spin_unlock(&tiqn->tiqn_tpg_lock);
3464 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3467 spin_unlock(&tiqn_lock);
3469 cmd->buf_ptr = payload;
3475 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3476 struct iscsi_text_rsp *hdr,
3477 enum iscsit_transport_type network_transport)
3479 int text_length, padding;
3480 bool completed = true;
3482 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3483 cmd->read_data_done,
3485 if (text_length < 0)
3489 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3491 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3492 cmd->read_data_done += text_length;
3493 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3494 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3496 hdr->opcode = ISCSI_OP_TEXT_RSP;
3497 padding = ((-text_length) & 3);
3498 hton24(hdr->dlength, text_length);
3499 hdr->itt = cmd->init_task_tag;
3500 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3501 cmd->stat_sn = conn->stat_sn++;
3502 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3504 iscsit_increment_maxcmdsn(cmd, conn->sess);
3506 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3507 * correctly increment MaxCmdSN for each response answering a
3508 * non immediate text request with a valid CmdSN.
3510 cmd->maxcmdsn_inc = 0;
3511 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3512 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3514 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3515 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3516 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3517 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3518 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3520 return text_length + padding;
3522 EXPORT_SYMBOL(iscsit_build_text_rsp);
3524 static int iscsit_send_text_rsp(
3525 struct iscsi_cmd *cmd,
3526 struct iscsi_conn *conn)
3528 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3531 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3532 conn->conn_transport->transport_type);
3533 if (text_length < 0)
3536 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3542 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3543 struct iscsi_reject *hdr)
3545 hdr->opcode = ISCSI_OP_REJECT;
3546 hdr->reason = cmd->reject_reason;
3547 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3548 hton24(hdr->dlength, ISCSI_HDR_LEN);
3549 hdr->ffffffff = cpu_to_be32(0xffffffff);
3550 cmd->stat_sn = conn->stat_sn++;
3551 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3552 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3553 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3556 EXPORT_SYMBOL(iscsit_build_reject);
3558 static int iscsit_send_reject(
3559 struct iscsi_cmd *cmd,
3560 struct iscsi_conn *conn)
3562 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3564 iscsit_build_reject(cmd, conn, hdr);
3566 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3567 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3569 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3574 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3578 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3579 * within iscsit_start_kthreads()
3581 * Here we use bitmap_id to determine which CPU that this
3582 * iSCSI connection's RX/TX threads will be scheduled to
3585 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3586 for_each_online_cpu(cpu) {
3588 cpumask_set_cpu(cpu, conn->conn_cpumask);
3593 * This should never be reached..
3596 cpumask_setall(conn->conn_cpumask);
3600 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3605 case ISTATE_SEND_R2T:
3606 ret = iscsit_send_r2t(cmd, conn);
3611 spin_lock_bh(&conn->cmd_lock);
3612 list_del_init(&cmd->i_conn_node);
3613 spin_unlock_bh(&conn->cmd_lock);
3615 iscsit_free_cmd(cmd, false);
3617 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3618 iscsit_mod_nopin_response_timer(conn);
3619 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3623 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3624 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3629 pr_err("Unknown Opcode: 0x%02x ITT:"
3630 " 0x%08x, i_state: %d on CID: %hu\n",
3631 cmd->iscsi_opcode, cmd->init_task_tag, state,
3641 EXPORT_SYMBOL(iscsit_immediate_queue);
3644 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3646 struct iscsit_transport *t = conn->conn_transport;
3647 struct iscsi_queue_req *qr;
3648 struct iscsi_cmd *cmd;
3652 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3653 atomic_set(&conn->check_immediate_queue, 0);
3656 kmem_cache_free(lio_qr_cache, qr);
3658 ret = t->iscsit_immediate_queue(conn, cmd, state);
3667 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3673 case ISTATE_SEND_DATAIN:
3674 ret = iscsit_send_datain(cmd, conn);
3679 goto check_rsp_state;
3680 else if (ret == 1) {
3682 spin_lock_bh(&cmd->istate_lock);
3683 cmd->i_state = ISTATE_SENT_STATUS;
3684 spin_unlock_bh(&cmd->istate_lock);
3686 if (atomic_read(&conn->check_immediate_queue))
3690 } else if (ret == 2) {
3691 /* Still must send status,
3692 SCF_TRANSPORT_TASK_SENSE was set */
3693 spin_lock_bh(&cmd->istate_lock);
3694 cmd->i_state = ISTATE_SEND_STATUS;
3695 spin_unlock_bh(&cmd->istate_lock);
3696 state = ISTATE_SEND_STATUS;
3697 goto check_rsp_state;
3701 case ISTATE_SEND_STATUS:
3702 case ISTATE_SEND_STATUS_RECOVERY:
3703 ret = iscsit_send_response(cmd, conn);
3705 case ISTATE_SEND_LOGOUTRSP:
3706 ret = iscsit_send_logout(cmd, conn);
3708 case ISTATE_SEND_ASYNCMSG:
3709 ret = iscsit_send_conn_drop_async_message(
3712 case ISTATE_SEND_NOPIN:
3713 ret = iscsit_send_nopin(cmd, conn);
3715 case ISTATE_SEND_REJECT:
3716 ret = iscsit_send_reject(cmd, conn);
3718 case ISTATE_SEND_TASKMGTRSP:
3719 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3722 ret = iscsit_tmr_post_handler(cmd, conn);
3724 iscsit_fall_back_to_erl0(conn->sess);
3726 case ISTATE_SEND_TEXTRSP:
3727 ret = iscsit_send_text_rsp(cmd, conn);
3730 pr_err("Unknown Opcode: 0x%02x ITT:"
3731 " 0x%08x, i_state: %d on CID: %hu\n",
3732 cmd->iscsi_opcode, cmd->init_task_tag,
3740 case ISTATE_SEND_LOGOUTRSP:
3741 if (!iscsit_logout_post_handler(cmd, conn))
3744 case ISTATE_SEND_STATUS:
3745 case ISTATE_SEND_ASYNCMSG:
3746 case ISTATE_SEND_NOPIN:
3747 case ISTATE_SEND_STATUS_RECOVERY:
3748 case ISTATE_SEND_TEXTRSP:
3749 case ISTATE_SEND_TASKMGTRSP:
3750 case ISTATE_SEND_REJECT:
3751 spin_lock_bh(&cmd->istate_lock);
3752 cmd->i_state = ISTATE_SENT_STATUS;
3753 spin_unlock_bh(&cmd->istate_lock);
3756 pr_err("Unknown Opcode: 0x%02x ITT:"
3757 " 0x%08x, i_state: %d on CID: %hu\n",
3758 cmd->iscsi_opcode, cmd->init_task_tag,
3759 cmd->i_state, conn->cid);
3763 if (atomic_read(&conn->check_immediate_queue))
3771 EXPORT_SYMBOL(iscsit_response_queue);
3773 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3775 struct iscsit_transport *t = conn->conn_transport;
3776 struct iscsi_queue_req *qr;
3777 struct iscsi_cmd *cmd;
3781 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3784 kmem_cache_free(lio_qr_cache, qr);
3786 ret = t->iscsit_response_queue(conn, cmd, state);
3787 if (ret == 1 || ret < 0)
3794 int iscsi_target_tx_thread(void *arg)
3797 struct iscsi_conn *conn = arg;
3798 bool conn_freed = false;
3801 * Allow ourselves to be interrupted by SIGINT so that a
3802 * connection recovery / failure event can be triggered externally.
3804 allow_signal(SIGINT);
3806 while (!kthread_should_stop()) {
3808 * Ensure that both TX and RX per connection kthreads
3809 * are scheduled to run on the same CPU.
3811 iscsit_thread_check_cpumask(conn, current, 1);
3813 wait_event_interruptible(conn->queues_wq,
3814 !iscsit_conn_all_queues_empty(conn));
3816 if (signal_pending(current))
3820 ret = iscsit_handle_immediate_queue(conn);
3824 ret = iscsit_handle_response_queue(conn);
3827 } else if (ret == -ECONNRESET) {
3830 } else if (ret < 0) {
3837 * Avoid the normal connection failure code-path if this connection
3838 * is still within LOGIN mode, and iscsi_np process context is
3839 * responsible for cleaning up the early connection failure.
3841 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3842 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3845 while (!kthread_should_stop()) {
3852 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3854 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3855 struct iscsi_cmd *cmd;
3858 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3859 case ISCSI_OP_SCSI_CMD:
3860 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3864 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3866 case ISCSI_OP_SCSI_DATA_OUT:
3867 ret = iscsit_handle_data_out(conn, buf);
3869 case ISCSI_OP_NOOP_OUT:
3871 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3872 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3876 ret = iscsit_handle_nop_out(conn, cmd, buf);
3878 case ISCSI_OP_SCSI_TMFUNC:
3879 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3883 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3886 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3887 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3891 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3896 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3898 case ISCSI_OP_LOGOUT:
3899 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3903 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3905 wait_for_completion_timeout(&conn->conn_logout_comp,
3906 SECONDS_FOR_LOGOUT_COMP * HZ);
3908 case ISCSI_OP_SNACK:
3909 ret = iscsit_handle_snack(conn, buf);
3912 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3913 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3914 pr_err("Cannot recover from unknown"
3915 " opcode while ERL=0, closing iSCSI connection.\n");
3918 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3919 " closing iSCSI connection.\n");
3926 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3929 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3933 spin_lock_bh(&conn->state_lock);
3934 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3935 spin_unlock_bh(&conn->state_lock);
3940 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3944 u32 checksum = 0, digest = 0;
3947 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3951 while (!kthread_should_stop()) {
3953 * Ensure that both TX and RX per connection kthreads
3954 * are scheduled to run on the same CPU.
3956 iscsit_thread_check_cpumask(conn, current, 0);
3958 memset(&iov, 0, sizeof(struct kvec));
3960 iov.iov_base = buffer;
3961 iov.iov_len = ISCSI_HDR_LEN;
3963 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3964 if (ret != ISCSI_HDR_LEN) {
3965 iscsit_rx_thread_wait_for_tcp(conn);
3969 if (conn->conn_ops->HeaderDigest) {
3970 iov.iov_base = &digest;
3971 iov.iov_len = ISCSI_CRC_LEN;
3973 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3974 if (ret != ISCSI_CRC_LEN) {
3975 iscsit_rx_thread_wait_for_tcp(conn);
3979 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3980 ISCSI_HDR_LEN, 0, NULL,
3983 if (digest != checksum) {
3984 pr_err("HeaderDigest CRC32C failed,"
3985 " received 0x%08x, computed 0x%08x\n",
3988 * Set the PDU to 0xff so it will intentionally
3989 * hit default in the switch below.
3991 memset(buffer, 0xff, ISCSI_HDR_LEN);
3992 atomic_long_inc(&conn->sess->conn_digest_errors);
3994 pr_debug("Got HeaderDigest CRC32C"
3995 " 0x%08x\n", checksum);
3999 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4002 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4004 if (conn->sess->sess_ops->SessionType &&
4005 ((!(opcode & ISCSI_OP_TEXT)) ||
4006 (!(opcode & ISCSI_OP_LOGOUT)))) {
4007 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4008 " while in Discovery Session, rejecting.\n", opcode);
4009 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4014 ret = iscsi_target_rx_opcode(conn, buffer);
4022 int iscsi_target_rx_thread(void *arg)
4025 struct iscsi_conn *conn = arg;
4026 bool conn_freed = false;
4029 * Allow ourselves to be interrupted by SIGINT so that a
4030 * connection recovery / failure event can be triggered externally.
4032 allow_signal(SIGINT);
4034 * Wait for iscsi_post_login_handler() to complete before allowing
4035 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4037 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4038 if (rc < 0 || iscsi_target_check_conn_state(conn))
4041 if (!conn->conn_transport->iscsit_get_rx_pdu)
4044 conn->conn_transport->iscsit_get_rx_pdu(conn);
4046 if (!signal_pending(current))
4047 atomic_set(&conn->transport_failed, 1);
4048 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4052 while (!kthread_should_stop()) {
4060 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4062 LIST_HEAD(tmp_list);
4063 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4064 struct iscsi_session *sess = conn->sess;
4066 * We expect this function to only ever be called from either RX or TX
4067 * thread context via iscsit_close_connection() once the other context
4068 * has been reset -> returned sleeping pre-handler state.
4070 spin_lock_bh(&conn->cmd_lock);
4071 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4073 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4074 struct se_cmd *se_cmd = &cmd->se_cmd;
4076 if (se_cmd->se_tfo != NULL) {
4077 spin_lock_irq(&se_cmd->t_state_lock);
4078 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4079 spin_unlock_irq(&se_cmd->t_state_lock);
4082 spin_unlock_bh(&conn->cmd_lock);
4084 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4085 list_del_init(&cmd->i_conn_node);
4087 iscsit_increment_maxcmdsn(cmd, sess);
4088 iscsit_free_cmd(cmd, true);
4093 static void iscsit_stop_timers_for_cmds(
4094 struct iscsi_conn *conn)
4096 struct iscsi_cmd *cmd;
4098 spin_lock_bh(&conn->cmd_lock);
4099 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4100 if (cmd->data_direction == DMA_TO_DEVICE)
4101 iscsit_stop_dataout_timer(cmd);
4103 spin_unlock_bh(&conn->cmd_lock);
4106 int iscsit_close_connection(
4107 struct iscsi_conn *conn)
4109 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4110 struct iscsi_session *sess = conn->sess;
4112 pr_debug("Closing iSCSI connection CID %hu on SID:"
4113 " %u\n", conn->cid, sess->sid);
4115 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4116 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4117 * sleeping and the logout response never got sent because the
4118 * connection failed.
4120 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4121 * to signal logout response TX interrupt completion. Go ahead and skip
4122 * this for iser since isert_rx_opcode() does not wait on logout failure,
4123 * and to avoid iscsi_conn pointer dereference in iser-target code.
4125 if (!conn->conn_transport->rdma_shutdown)
4126 complete(&conn->conn_logout_comp);
4128 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4129 if (conn->tx_thread &&
4130 cmpxchg(&conn->tx_thread_active, true, false)) {
4131 send_sig(SIGINT, conn->tx_thread, 1);
4132 kthread_stop(conn->tx_thread);
4134 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4135 if (conn->rx_thread &&
4136 cmpxchg(&conn->rx_thread_active, true, false)) {
4137 send_sig(SIGINT, conn->rx_thread, 1);
4138 kthread_stop(conn->rx_thread);
4142 spin_lock(&iscsit_global->ts_bitmap_lock);
4143 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4145 spin_unlock(&iscsit_global->ts_bitmap_lock);
4147 iscsit_stop_timers_for_cmds(conn);
4148 iscsit_stop_nopin_response_timer(conn);
4149 iscsit_stop_nopin_timer(conn);
4151 if (conn->conn_transport->iscsit_wait_conn)
4152 conn->conn_transport->iscsit_wait_conn(conn);
4155 * During Connection recovery drop unacknowledged out of order
4156 * commands for this connection, and prepare the other commands
4159 * During normal operation clear the out of order commands (but
4160 * do not free the struct iscsi_ooo_cmdsn's) and release all
4161 * struct iscsi_cmds.
4163 if (atomic_read(&conn->connection_recovery)) {
4164 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4165 iscsit_prepare_cmds_for_reallegiance(conn);
4167 iscsit_clear_ooo_cmdsns_for_conn(conn);
4168 iscsit_release_commands_from_conn(conn);
4170 iscsit_free_queue_reqs_for_conn(conn);
4173 * Handle decrementing session or connection usage count if
4174 * a logout response was not able to be sent because the
4175 * connection failed. Fall back to Session Recovery here.
4177 if (atomic_read(&conn->conn_logout_remove)) {
4178 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4179 iscsit_dec_conn_usage_count(conn);
4180 iscsit_dec_session_usage_count(sess);
4182 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4183 iscsit_dec_conn_usage_count(conn);
4185 atomic_set(&conn->conn_logout_remove, 0);
4186 atomic_set(&sess->session_reinstatement, 0);
4187 atomic_set(&sess->session_fall_back_to_erl0, 1);
4190 spin_lock_bh(&sess->conn_lock);
4191 list_del(&conn->conn_list);
4194 * Attempt to let the Initiator know this connection failed by
4195 * sending an Connection Dropped Async Message on another
4196 * active connection.
4198 if (atomic_read(&conn->connection_recovery))
4199 iscsit_build_conn_drop_async_message(conn);
4201 spin_unlock_bh(&sess->conn_lock);
4204 * If connection reinstatement is being performed on this connection,
4205 * up the connection reinstatement semaphore that is being blocked on
4206 * in iscsit_cause_connection_reinstatement().
4208 spin_lock_bh(&conn->state_lock);
4209 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4210 spin_unlock_bh(&conn->state_lock);
4211 complete(&conn->conn_wait_comp);
4212 wait_for_completion(&conn->conn_post_wait_comp);
4213 spin_lock_bh(&conn->state_lock);
4217 * If connection reinstatement is being performed on this connection
4218 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4219 * connection wait rcfr semaphore that is being blocked on
4220 * an iscsit_connection_reinstatement_rcfr().
4222 if (atomic_read(&conn->connection_wait_rcfr)) {
4223 spin_unlock_bh(&conn->state_lock);
4224 complete(&conn->conn_wait_rcfr_comp);
4225 wait_for_completion(&conn->conn_post_wait_comp);
4226 spin_lock_bh(&conn->state_lock);
4228 atomic_set(&conn->connection_reinstatement, 1);
4229 spin_unlock_bh(&conn->state_lock);
4232 * If any other processes are accessing this connection pointer we
4233 * must wait until they have completed.
4235 iscsit_check_conn_usage_count(conn);
4237 ahash_request_free(conn->conn_tx_hash);
4238 if (conn->conn_rx_hash) {
4239 struct crypto_ahash *tfm;
4241 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4242 ahash_request_free(conn->conn_rx_hash);
4243 crypto_free_ahash(tfm);
4247 sock_release(conn->sock);
4249 if (conn->conn_transport->iscsit_free_conn)
4250 conn->conn_transport->iscsit_free_conn(conn);
4252 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4253 conn->conn_state = TARG_CONN_STATE_FREE;
4254 iscsit_free_conn(conn);
4256 spin_lock_bh(&sess->conn_lock);
4257 atomic_dec(&sess->nconn);
4258 pr_debug("Decremented iSCSI connection count to %hu from node:"
4259 " %s\n", atomic_read(&sess->nconn),
4260 sess->sess_ops->InitiatorName);
4262 * Make sure that if one connection fails in an non ERL=2 iSCSI
4263 * Session that they all fail.
4265 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4266 !atomic_read(&sess->session_logout))
4267 atomic_set(&sess->session_fall_back_to_erl0, 1);
4270 * If this was not the last connection in the session, and we are
4271 * performing session reinstatement or falling back to ERL=0, call
4272 * iscsit_stop_session() without sleeping to shutdown the other
4273 * active connections.
4275 if (atomic_read(&sess->nconn)) {
4276 if (!atomic_read(&sess->session_reinstatement) &&
4277 !atomic_read(&sess->session_fall_back_to_erl0)) {
4278 spin_unlock_bh(&sess->conn_lock);
4281 if (!atomic_read(&sess->session_stop_active)) {
4282 atomic_set(&sess->session_stop_active, 1);
4283 spin_unlock_bh(&sess->conn_lock);
4284 iscsit_stop_session(sess, 0, 0);
4287 spin_unlock_bh(&sess->conn_lock);
4292 * If this was the last connection in the session and one of the
4293 * following is occurring:
4295 * Session Reinstatement is not being performed, and are falling back
4296 * to ERL=0 call iscsit_close_session().
4298 * Session Logout was requested. iscsit_close_session() will be called
4301 * Session Continuation is not being performed, start the Time2Retain
4302 * handler and check if sleep_on_sess_wait_sem is active.
4304 if (!atomic_read(&sess->session_reinstatement) &&
4305 atomic_read(&sess->session_fall_back_to_erl0)) {
4306 spin_unlock_bh(&sess->conn_lock);
4307 complete_all(&sess->session_wait_comp);
4308 iscsit_close_session(sess);
4311 } else if (atomic_read(&sess->session_logout)) {
4312 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4313 sess->session_state = TARG_SESS_STATE_FREE;
4315 if (atomic_read(&sess->session_close)) {
4316 spin_unlock_bh(&sess->conn_lock);
4317 complete_all(&sess->session_wait_comp);
4318 iscsit_close_session(sess);
4320 spin_unlock_bh(&sess->conn_lock);
4325 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4326 sess->session_state = TARG_SESS_STATE_FAILED;
4328 if (!atomic_read(&sess->session_continuation))
4329 iscsit_start_time2retain_handler(sess);
4331 if (atomic_read(&sess->session_close)) {
4332 spin_unlock_bh(&sess->conn_lock);
4333 complete_all(&sess->session_wait_comp);
4334 iscsit_close_session(sess);
4336 spin_unlock_bh(&sess->conn_lock);
4344 * If the iSCSI Session for the iSCSI Initiator Node exists,
4345 * forcefully shutdown the iSCSI NEXUS.
4347 int iscsit_close_session(struct iscsi_session *sess)
4349 struct iscsi_portal_group *tpg = sess->tpg;
4350 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4352 if (atomic_read(&sess->nconn)) {
4353 pr_err("%d connection(s) still exist for iSCSI session"
4354 " to %s\n", atomic_read(&sess->nconn),
4355 sess->sess_ops->InitiatorName);
4359 spin_lock_bh(&se_tpg->session_lock);
4360 atomic_set(&sess->session_logout, 1);
4361 atomic_set(&sess->session_reinstatement, 1);
4362 iscsit_stop_time2retain_timer(sess);
4363 spin_unlock_bh(&se_tpg->session_lock);
4366 * transport_deregister_session_configfs() will clear the
4367 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4368 * can be setting it again with __transport_register_session() in
4369 * iscsi_post_login_handler() again after the iscsit_stop_session()
4370 * completes in iscsi_np context.
4372 transport_deregister_session_configfs(sess->se_sess);
4375 * If any other processes are accessing this session pointer we must
4376 * wait until they have completed. If we are in an interrupt (the
4377 * time2retain handler) and contain and active session usage count we
4378 * restart the timer and exit.
4380 if (!in_interrupt()) {
4381 iscsit_check_session_usage_count(sess);
4383 if (iscsit_check_session_usage_count(sess) == 2) {
4384 atomic_set(&sess->session_logout, 0);
4385 iscsit_start_time2retain_handler(sess);
4390 transport_deregister_session(sess->se_sess);
4392 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4393 iscsit_free_connection_recovery_entries(sess);
4395 iscsit_free_all_ooo_cmdsns(sess);
4397 spin_lock_bh(&se_tpg->session_lock);
4398 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4399 sess->session_state = TARG_SESS_STATE_FREE;
4400 pr_debug("Released iSCSI session from node: %s\n",
4401 sess->sess_ops->InitiatorName);
4404 tpg->tpg_tiqn->tiqn_nsessions--;
4406 pr_debug("Decremented number of active iSCSI Sessions on"
4407 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4409 ida_free(&sess_ida, sess->session_index);
4410 kfree(sess->sess_ops);
4411 sess->sess_ops = NULL;
4412 spin_unlock_bh(&se_tpg->session_lock);
4418 static void iscsit_logout_post_handler_closesession(
4419 struct iscsi_conn *conn)
4421 struct iscsi_session *sess = conn->sess;
4424 * Traditional iscsi/tcp will invoke this logic from TX thread
4425 * context during session logout, so clear tx_thread_active and
4426 * sleep if iscsit_close_connection() has not already occured.
4428 * Since iser-target invokes this logic from it's own workqueue,
4429 * always sleep waiting for RX/TX thread shutdown to complete
4430 * within iscsit_close_connection().
4432 if (!conn->conn_transport->rdma_shutdown) {
4433 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4438 atomic_set(&conn->conn_logout_remove, 0);
4439 complete(&conn->conn_logout_comp);
4441 iscsit_dec_conn_usage_count(conn);
4442 atomic_set(&sess->session_close, 1);
4443 iscsit_stop_session(sess, sleep, sleep);
4444 iscsit_dec_session_usage_count(sess);
4447 static void iscsit_logout_post_handler_samecid(
4448 struct iscsi_conn *conn)
4452 if (!conn->conn_transport->rdma_shutdown) {
4453 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4458 atomic_set(&conn->conn_logout_remove, 0);
4459 complete(&conn->conn_logout_comp);
4461 iscsit_cause_connection_reinstatement(conn, sleep);
4462 iscsit_dec_conn_usage_count(conn);
4465 static void iscsit_logout_post_handler_diffcid(
4466 struct iscsi_conn *conn,
4469 struct iscsi_conn *l_conn;
4470 struct iscsi_session *sess = conn->sess;
4471 bool conn_found = false;
4476 spin_lock_bh(&sess->conn_lock);
4477 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4478 if (l_conn->cid == cid) {
4479 iscsit_inc_conn_usage_count(l_conn);
4484 spin_unlock_bh(&sess->conn_lock);
4490 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4492 spin_lock_bh(&l_conn->state_lock);
4493 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4494 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4495 spin_unlock_bh(&l_conn->state_lock);
4497 iscsit_cause_connection_reinstatement(l_conn, 1);
4498 iscsit_dec_conn_usage_count(l_conn);
4502 * Return of 0 causes the TX thread to restart.
4504 int iscsit_logout_post_handler(
4505 struct iscsi_cmd *cmd,
4506 struct iscsi_conn *conn)
4510 switch (cmd->logout_reason) {
4511 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4512 switch (cmd->logout_response) {
4513 case ISCSI_LOGOUT_SUCCESS:
4514 case ISCSI_LOGOUT_CLEANUP_FAILED:
4516 iscsit_logout_post_handler_closesession(conn);
4521 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4522 if (conn->cid == cmd->logout_cid) {
4523 switch (cmd->logout_response) {
4524 case ISCSI_LOGOUT_SUCCESS:
4525 case ISCSI_LOGOUT_CLEANUP_FAILED:
4527 iscsit_logout_post_handler_samecid(conn);
4532 switch (cmd->logout_response) {
4533 case ISCSI_LOGOUT_SUCCESS:
4534 iscsit_logout_post_handler_diffcid(conn,
4537 case ISCSI_LOGOUT_CID_NOT_FOUND:
4538 case ISCSI_LOGOUT_CLEANUP_FAILED:
4545 case ISCSI_LOGOUT_REASON_RECOVERY:
4546 switch (cmd->logout_response) {
4547 case ISCSI_LOGOUT_SUCCESS:
4548 case ISCSI_LOGOUT_CID_NOT_FOUND:
4549 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4550 case ISCSI_LOGOUT_CLEANUP_FAILED:
4562 EXPORT_SYMBOL(iscsit_logout_post_handler);
4564 void iscsit_fail_session(struct iscsi_session *sess)
4566 struct iscsi_conn *conn;
4568 spin_lock_bh(&sess->conn_lock);
4569 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4570 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4571 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4573 spin_unlock_bh(&sess->conn_lock);
4575 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4576 sess->session_state = TARG_SESS_STATE_FAILED;
4579 void iscsit_stop_session(
4580 struct iscsi_session *sess,
4582 int connection_sleep)
4584 u16 conn_count = atomic_read(&sess->nconn);
4585 struct iscsi_conn *conn, *conn_tmp = NULL;
4588 spin_lock_bh(&sess->conn_lock);
4590 if (connection_sleep) {
4591 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4593 if (conn_count == 0)
4596 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4599 iscsit_inc_conn_usage_count(conn_tmp);
4602 iscsit_inc_conn_usage_count(conn);
4604 spin_unlock_bh(&sess->conn_lock);
4605 iscsit_cause_connection_reinstatement(conn, 1);
4606 spin_lock_bh(&sess->conn_lock);
4608 iscsit_dec_conn_usage_count(conn);
4610 iscsit_dec_conn_usage_count(conn_tmp);
4614 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4615 iscsit_cause_connection_reinstatement(conn, 0);
4618 if (session_sleep && atomic_read(&sess->nconn)) {
4619 spin_unlock_bh(&sess->conn_lock);
4620 wait_for_completion(&sess->session_wait_comp);
4622 spin_unlock_bh(&sess->conn_lock);
4625 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4627 struct iscsi_session *sess;
4628 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4629 struct se_session *se_sess, *se_sess_tmp;
4630 LIST_HEAD(free_list);
4631 int session_count = 0;
4633 spin_lock_bh(&se_tpg->session_lock);
4634 if (tpg->nsessions && !force) {
4635 spin_unlock_bh(&se_tpg->session_lock);
4639 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4641 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4643 spin_lock(&sess->conn_lock);
4644 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4645 atomic_read(&sess->session_logout) ||
4646 atomic_read(&sess->session_close) ||
4647 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4648 spin_unlock(&sess->conn_lock);
4651 iscsit_inc_session_usage_count(sess);
4652 atomic_set(&sess->session_reinstatement, 1);
4653 atomic_set(&sess->session_fall_back_to_erl0, 1);
4654 atomic_set(&sess->session_close, 1);
4655 spin_unlock(&sess->conn_lock);
4657 list_move_tail(&se_sess->sess_list, &free_list);
4659 spin_unlock_bh(&se_tpg->session_lock);
4661 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4662 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4664 list_del_init(&se_sess->sess_list);
4665 iscsit_stop_session(sess, 1, 1);
4666 iscsit_dec_session_usage_count(sess);
4670 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4671 " Group: %hu\n", session_count, tpg->tpgt);
4675 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4676 MODULE_VERSION("4.1.x");
4677 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4678 MODULE_LICENSE("GPL");
4680 module_init(iscsi_target_init_module);
4681 module_exit(iscsi_target_cleanup_module);