1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
33 #include <target/iscsi/iscsi_target_core.h>
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_datain_values.h"
37 #include "iscsi_target_erl0.h"
38 #include "iscsi_target_erl1.h"
39 #include "iscsi_target_erl2.h"
40 #include "iscsi_target_login.h"
41 #include "iscsi_target_tmr.h"
42 #include "iscsi_target_tpg.h"
43 #include "iscsi_target_util.h"
44 #include "iscsi_target.h"
45 #include "iscsi_target_device.h"
46 #include <target/iscsi/iscsi_target_stat.h>
48 #include <target/iscsi/iscsi_transport.h>
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_MUTEX(np_lock);
55 static struct idr tiqn_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
60 struct iscsit_global *iscsit_global;
62 struct kmem_cache *lio_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 struct iscsi_scsi_req *, u32);
70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
72 struct iscsi_tiqn *tiqn = NULL;
74 spin_lock(&tiqn_lock);
75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
76 if (!strcmp(tiqn->tiqn, buf)) {
78 spin_lock(&tiqn->tiqn_state_lock);
79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
80 tiqn->tiqn_access_count++;
81 spin_unlock(&tiqn->tiqn_state_lock);
82 spin_unlock(&tiqn_lock);
85 spin_unlock(&tiqn->tiqn_state_lock);
88 spin_unlock(&tiqn_lock);
93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
95 spin_lock(&tiqn->tiqn_state_lock);
96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
98 spin_unlock(&tiqn->tiqn_state_lock);
101 spin_unlock(&tiqn->tiqn_state_lock);
106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
108 spin_lock(&tiqn->tiqn_state_lock);
109 tiqn->tiqn_access_count--;
110 spin_unlock(&tiqn->tiqn_state_lock);
114 * Note that IQN formatting is expected to be done in userspace, and
115 * no explict IQN format checks are done here.
117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
119 struct iscsi_tiqn *tiqn = NULL;
122 if (strlen(buf) >= ISCSI_IQN_LEN) {
123 pr_err("Target IQN exceeds %d bytes\n",
125 return ERR_PTR(-EINVAL);
128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
130 pr_err("Unable to allocate struct iscsi_tiqn\n");
131 return ERR_PTR(-ENOMEM);
134 sprintf(tiqn->tiqn, "%s", buf);
135 INIT_LIST_HEAD(&tiqn->tiqn_list);
136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
137 spin_lock_init(&tiqn->tiqn_state_lock);
138 spin_lock_init(&tiqn->tiqn_tpg_lock);
139 spin_lock_init(&tiqn->sess_err_stats.lock);
140 spin_lock_init(&tiqn->login_stats.lock);
141 spin_lock_init(&tiqn->logout_stats.lock);
143 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145 idr_preload(GFP_KERNEL);
146 spin_lock(&tiqn_lock);
148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
151 spin_unlock(&tiqn_lock);
156 tiqn->tiqn_index = ret;
157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159 spin_unlock(&tiqn_lock);
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
171 * Wait for accesses to said struct iscsi_tiqn to end.
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
177 spin_lock(&tiqn->tiqn_state_lock);
179 spin_unlock(&tiqn->tiqn_state_lock);
182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
195 iscsit_wait_for_tiqn(tiqn);
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
211 * Determine if the network portal is accepting storage traffic.
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
218 spin_unlock_bh(&np->np_thread_lock);
220 * Determine if the portal group is accepting storage traffic.
222 spin_lock_bh(&tpg->tpg_state_lock);
223 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
224 spin_unlock_bh(&tpg->tpg_state_lock);
227 spin_unlock_bh(&tpg->tpg_state_lock);
230 * Here we serialize access across the TIQN+TPG Tuple.
232 ret = down_interruptible(&tpg->np_login_sem);
236 spin_lock_bh(&tpg->tpg_state_lock);
237 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
238 spin_unlock_bh(&tpg->tpg_state_lock);
239 up(&tpg->np_login_sem);
242 spin_unlock_bh(&tpg->tpg_state_lock);
247 void iscsit_login_kref_put(struct kref *kref)
249 struct iscsi_tpg_np *tpg_np = container_of(kref,
250 struct iscsi_tpg_np, tpg_np_kref);
252 complete(&tpg_np->tpg_np_comp);
255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
256 struct iscsi_tpg_np *tpg_np)
258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260 up(&tpg->np_login_sem);
263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
266 iscsit_put_tiqn_for_login(tiqn);
271 bool iscsit_check_np_match(
272 struct sockaddr_storage *sockaddr,
274 int network_transport)
276 struct sockaddr_in *sock_in, *sock_in_e;
277 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 bool ip_match = false;
281 if (sockaddr->ss_family == AF_INET6) {
282 sock_in6 = (struct sockaddr_in6 *)sockaddr;
283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285 if (!memcmp(&sock_in6->sin6_addr.in6_u,
286 &sock_in6_e->sin6_addr.in6_u,
287 sizeof(struct in6_addr)))
290 port = ntohs(sock_in6->sin6_port);
291 port_e = ntohs(sock_in6_e->sin6_port);
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
299 port = ntohs(sock_in->sin_port);
300 port_e = ntohs(sock_in_e->sin_port);
303 if (ip_match && (port_e == port) &&
304 (np->np_network_transport == network_transport))
311 * Called with mutex np_lock held
313 static struct iscsi_np *iscsit_get_np(
314 struct sockaddr_storage *sockaddr,
315 int network_transport)
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
335 spin_unlock_bh(&np->np_thread_lock);
338 spin_unlock_bh(&np->np_thread_lock);
344 struct iscsi_np *iscsit_add_np(
345 struct sockaddr_storage *sockaddr,
346 int network_transport)
351 mutex_lock(&np_lock);
354 * Locate the existing struct iscsi_np if already active..
356 np = iscsit_get_np(sockaddr, network_transport);
358 mutex_unlock(&np_lock);
362 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
364 pr_err("Unable to allocate memory for struct iscsi_np\n");
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
378 mutex_unlock(&np_lock);
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
387 mutex_unlock(&np_lock);
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
409 int iscsit_reset_np_thread(
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
423 spin_unlock_bh(&np->np_thread_lock);
424 send_sig(SIGINT, np->np_thread, 1);
425 wait_for_completion(&np->np_restart_comp);
426 spin_lock_bh(&np->np_thread_lock);
428 spin_unlock_bh(&np->np_thread_lock);
430 if (tpg_np && shutdown) {
431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
433 wait_for_completion(&tpg_np->tpg_np_comp);
439 static void iscsit_free_np(struct iscsi_np *np)
442 sock_release(np->np_socket);
445 int iscsit_del_np(struct iscsi_np *np)
447 spin_lock_bh(&np->np_thread_lock);
449 if (np->np_exports) {
451 spin_unlock_bh(&np->np_thread_lock);
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
464 np->np_thread = NULL;
467 np->np_transport->iscsit_free_np(np);
469 mutex_lock(&np_lock);
470 list_del(&np->np_list);
471 mutex_unlock(&np_lock);
473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np->np_sockaddr, np->np_transport->name);
476 iscsit_put_transport(np->np_transport);
481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
485 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
488 EXPORT_SYMBOL(iscsit_queue_rsp);
490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
492 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node) &&
496 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
497 list_del_init(&cmd->i_conn_node);
498 spin_unlock_bh(&conn->cmd_lock);
500 __iscsit_free_cmd(cmd, scsi_cmd, true);
502 EXPORT_SYMBOL(iscsit_aborted_task);
504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
505 u32, u32, u8 *, u8 *);
506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
510 const void *data_buf, u32 data_buf_len)
512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
514 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
517 iov = &cmd->iov_misc[0];
518 iov[niov].iov_base = cmd->pdu;
519 iov[niov++].iov_len = ISCSI_HDR_LEN;
521 if (conn->conn_ops->HeaderDigest) {
522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
525 ISCSI_HDR_LEN, 0, NULL,
526 (u8 *)header_digest);
528 iov[0].iov_len += ISCSI_CRC_LEN;
529 tx_size += ISCSI_CRC_LEN;
530 pr_debug("Attaching CRC32C HeaderDigest"
531 " to opcode 0x%x 0x%08x\n",
532 hdr->opcode, *header_digest);
536 u32 padding = ((-data_buf_len) & 3);
538 iov[niov].iov_base = (void *)data_buf;
539 iov[niov++].iov_len = data_buf_len;
540 tx_size += data_buf_len;
543 iov[niov].iov_base = &cmd->pad_bytes;
544 iov[niov++].iov_len = padding;
546 pr_debug("Attaching %u additional"
547 " padding bytes.\n", padding);
550 if (conn->conn_ops->DataDigest) {
551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
552 data_buf, data_buf_len,
554 (u8 *)&cmd->pad_bytes,
555 (u8 *)&cmd->data_crc);
557 iov[niov].iov_base = &cmd->data_crc;
558 iov[niov++].iov_len = ISCSI_CRC_LEN;
559 tx_size += ISCSI_CRC_LEN;
560 pr_debug("Attached DataDigest for %u"
561 " bytes opcode 0x%x, CRC 0x%08x\n",
562 data_buf_len, hdr->opcode, cmd->data_crc);
566 cmd->iov_misc_count = niov;
567 cmd->tx_size = tx_size;
569 ret = iscsit_send_tx_data(cmd, conn, 1);
571 iscsit_tx_thread_wait_for_tcp(conn);
578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
579 static void iscsit_unmap_iovec(struct iscsi_cmd *);
580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
581 u32, u32, u32, u8 *);
583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
584 const struct iscsi_datain *datain)
587 u32 iov_count = 0, tx_size = 0;
590 iov = &cmd->iov_data[0];
591 iov[iov_count].iov_base = cmd->pdu;
592 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
593 tx_size += ISCSI_HDR_LEN;
595 if (conn->conn_ops->HeaderDigest) {
596 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
598 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
599 ISCSI_HDR_LEN, 0, NULL,
600 (u8 *)header_digest);
602 iov[0].iov_len += ISCSI_CRC_LEN;
603 tx_size += ISCSI_CRC_LEN;
605 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
609 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
610 datain->offset, datain->length);
614 iov_count += iov_ret;
615 tx_size += datain->length;
617 cmd->padding = ((-datain->length) & 3);
619 iov[iov_count].iov_base = cmd->pad_bytes;
620 iov[iov_count++].iov_len = cmd->padding;
621 tx_size += cmd->padding;
623 pr_debug("Attaching %u padding bytes\n", cmd->padding);
626 if (conn->conn_ops->DataDigest) {
627 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
633 iov[iov_count].iov_base = &cmd->data_crc;
634 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
635 tx_size += ISCSI_CRC_LEN;
637 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
638 datain->length + cmd->padding, cmd->data_crc);
641 cmd->iov_data_count = iov_count;
642 cmd->tx_size = tx_size;
644 ret = iscsit_fe_sendpage_sg(cmd, conn);
646 iscsit_unmap_iovec(cmd);
649 iscsit_tx_thread_wait_for_tcp(conn);
656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
657 struct iscsi_datain_req *dr, const void *buf,
661 return iscsit_xmit_datain_pdu(conn, cmd, buf);
663 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
668 return TARGET_PROT_NORMAL;
671 static struct iscsit_transport iscsi_target_transport = {
673 .transport_type = ISCSI_TCP,
674 .rdma_shutdown = false,
676 .iscsit_setup_np = iscsit_setup_np,
677 .iscsit_accept_np = iscsit_accept_np,
678 .iscsit_free_np = iscsit_free_np,
679 .iscsit_get_login_rx = iscsit_get_login_rx,
680 .iscsit_put_login_tx = iscsit_put_login_tx,
681 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
682 .iscsit_immediate_queue = iscsit_immediate_queue,
683 .iscsit_response_queue = iscsit_response_queue,
684 .iscsit_queue_data_in = iscsit_queue_rsp,
685 .iscsit_queue_status = iscsit_queue_rsp,
686 .iscsit_aborted_task = iscsit_aborted_task,
687 .iscsit_xmit_pdu = iscsit_xmit_pdu,
688 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
689 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
692 static int __init iscsi_target_init_module(void)
696 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
698 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
699 if (!iscsit_global) {
700 pr_err("Unable to allocate memory for iscsit_global\n");
703 spin_lock_init(&iscsit_global->ts_bitmap_lock);
704 mutex_init(&auth_id_lock);
705 spin_lock_init(&sess_idr_lock);
709 ret = target_register_template(&iscsi_ops);
713 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
714 iscsit_global->ts_bitmap = vzalloc(size);
715 if (!iscsit_global->ts_bitmap) {
716 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
720 lio_qr_cache = kmem_cache_create("lio_qr_cache",
721 sizeof(struct iscsi_queue_req),
722 __alignof__(struct iscsi_queue_req), 0, NULL);
724 pr_err("nable to kmem_cache_create() for"
729 lio_dr_cache = kmem_cache_create("lio_dr_cache",
730 sizeof(struct iscsi_datain_req),
731 __alignof__(struct iscsi_datain_req), 0, NULL);
733 pr_err("Unable to kmem_cache_create() for"
738 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
739 sizeof(struct iscsi_ooo_cmdsn),
740 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
741 if (!lio_ooo_cache) {
742 pr_err("Unable to kmem_cache_create() for"
747 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
748 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
750 if (!lio_r2t_cache) {
751 pr_err("Unable to kmem_cache_create() for"
756 iscsit_register_transport(&iscsi_target_transport);
758 if (iscsit_load_discovery_tpg() < 0)
763 iscsit_unregister_transport(&iscsi_target_transport);
764 kmem_cache_destroy(lio_r2t_cache);
766 kmem_cache_destroy(lio_ooo_cache);
768 kmem_cache_destroy(lio_dr_cache);
770 kmem_cache_destroy(lio_qr_cache);
772 vfree(iscsit_global->ts_bitmap);
774 /* XXX: this probably wants it to be it's own unwind step.. */
775 if (iscsit_global->discovery_tpg)
776 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
777 target_unregister_template(&iscsi_ops);
779 kfree(iscsit_global);
783 static void __exit iscsi_target_cleanup_module(void)
785 iscsit_release_discovery_tpg();
786 iscsit_unregister_transport(&iscsi_target_transport);
787 kmem_cache_destroy(lio_qr_cache);
788 kmem_cache_destroy(lio_dr_cache);
789 kmem_cache_destroy(lio_ooo_cache);
790 kmem_cache_destroy(lio_r2t_cache);
793 * Shutdown discovery sessions and disable discovery TPG
795 if (iscsit_global->discovery_tpg)
796 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
798 target_unregister_template(&iscsi_ops);
800 vfree(iscsit_global->ts_bitmap);
801 kfree(iscsit_global);
804 int iscsit_add_reject(
805 struct iscsi_conn *conn,
809 struct iscsi_cmd *cmd;
811 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
815 cmd->iscsi_opcode = ISCSI_OP_REJECT;
816 cmd->reject_reason = reason;
818 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
820 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
821 iscsit_free_cmd(cmd, false);
825 spin_lock_bh(&conn->cmd_lock);
826 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
827 spin_unlock_bh(&conn->cmd_lock);
829 cmd->i_state = ISTATE_SEND_REJECT;
830 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
834 EXPORT_SYMBOL(iscsit_add_reject);
836 static int iscsit_add_reject_from_cmd(
837 struct iscsi_cmd *cmd,
842 struct iscsi_conn *conn;
845 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
851 cmd->iscsi_opcode = ISCSI_OP_REJECT;
852 cmd->reject_reason = reason;
854 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
856 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
857 iscsit_free_cmd(cmd, false);
862 spin_lock_bh(&conn->cmd_lock);
863 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
864 spin_unlock_bh(&conn->cmd_lock);
867 cmd->i_state = ISTATE_SEND_REJECT;
868 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
870 * Perform the kref_put now if se_cmd has already been setup by
871 * scsit_setup_scsi_cmd()
873 if (cmd->se_cmd.se_tfo != NULL) {
874 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
875 target_put_sess_cmd(&cmd->se_cmd);
880 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
883 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
886 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
888 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
890 EXPORT_SYMBOL(iscsit_reject_cmd);
893 * Map some portion of the allocated scatterlist to an iovec, suitable for
894 * kernel sockets to copy data in/out.
896 static int iscsit_map_iovec(
897 struct iscsi_cmd *cmd,
903 struct scatterlist *sg;
904 unsigned int page_off;
907 * We know each entry in t_data_sg contains a page.
909 u32 ent = data_offset / PAGE_SIZE;
911 if (ent >= cmd->se_cmd.t_data_nents) {
912 pr_err("Initial page entry out-of-bounds\n");
916 sg = &cmd->se_cmd.t_data_sg[ent];
917 page_off = (data_offset % PAGE_SIZE);
919 cmd->first_data_sg = sg;
920 cmd->first_data_sg_off = page_off;
922 while (data_length) {
923 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
925 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
926 iov[i].iov_len = cur_len;
928 data_length -= cur_len;
934 cmd->kmapped_nents = i;
939 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
942 struct scatterlist *sg;
944 sg = cmd->first_data_sg;
946 for (i = 0; i < cmd->kmapped_nents; i++)
947 kunmap(sg_page(&sg[i]));
950 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
953 struct iscsi_cmd *cmd, *cmd_p;
955 conn->exp_statsn = exp_statsn;
957 if (conn->sess->sess_ops->RDMAExtensions)
960 spin_lock_bh(&conn->cmd_lock);
961 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
962 spin_lock(&cmd->istate_lock);
963 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
964 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
965 cmd->i_state = ISTATE_REMOVE;
966 spin_unlock(&cmd->istate_lock);
967 list_move_tail(&cmd->i_conn_node, &ack_list);
970 spin_unlock(&cmd->istate_lock);
972 spin_unlock_bh(&conn->cmd_lock);
974 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
975 list_del_init(&cmd->i_conn_node);
976 iscsit_free_cmd(cmd, false);
980 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
982 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
984 iov_count += ISCSI_IOV_DATA_BUFFER;
986 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
987 if (!cmd->iov_data) {
988 pr_err("Unable to allocate cmd->iov_data\n");
992 cmd->orig_iov_data_count = iov_count;
996 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
999 int data_direction, payload_length;
1000 struct iscsi_scsi_req *hdr;
1001 int iscsi_task_attr;
1004 atomic_long_inc(&conn->sess->cmd_pdus);
1006 hdr = (struct iscsi_scsi_req *) buf;
1007 payload_length = ntoh24(hdr->dlength);
1009 /* FIXME; Add checks for AdditionalHeaderSegment */
1011 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1012 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1013 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1014 " not set. Bad iSCSI Initiator.\n");
1015 return iscsit_add_reject_cmd(cmd,
1016 ISCSI_REASON_BOOKMARK_INVALID, buf);
1019 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1020 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1022 * From RFC-3720 Section 10.3.1:
1024 * "Either or both of R and W MAY be 1 when either the
1025 * Expected Data Transfer Length and/or Bidirectional Read
1026 * Expected Data Transfer Length are 0"
1028 * For this case, go ahead and clear the unnecssary bits
1029 * to avoid any confusion with ->data_direction.
1031 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1032 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1034 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1035 " set when Expected Data Transfer Length is 0 for"
1036 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1039 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1041 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1042 " MUST be set if Expected Data Transfer Length is not 0."
1043 " Bad iSCSI Initiator\n");
1044 return iscsit_add_reject_cmd(cmd,
1045 ISCSI_REASON_BOOKMARK_INVALID, buf);
1048 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1049 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1050 pr_err("Bidirectional operations not supported!\n");
1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
1055 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1056 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1057 " Scsi Command PDU.\n");
1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_BOOKMARK_INVALID, buf);
1062 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1063 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1064 " protocol error.\n", payload_length);
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_PROTOCOL_ERROR, buf);
1069 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1070 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1071 pr_err("Expected Data Transfer Length and Length of"
1072 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1073 " bit is not set protocol error\n");
1074 return iscsit_add_reject_cmd(cmd,
1075 ISCSI_REASON_PROTOCOL_ERROR, buf);
1078 if (payload_length > be32_to_cpu(hdr->data_length)) {
1079 pr_err("DataSegmentLength: %u is greater than"
1080 " EDTL: %u, protocol error.\n", payload_length,
1082 return iscsit_add_reject_cmd(cmd,
1083 ISCSI_REASON_PROTOCOL_ERROR, buf);
1086 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1087 pr_err("DataSegmentLength: %u is greater than"
1088 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1089 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1090 return iscsit_add_reject_cmd(cmd,
1091 ISCSI_REASON_PROTOCOL_ERROR, buf);
1094 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1095 pr_err("DataSegmentLength: %u is greater than"
1096 " FirstBurstLength: %u, protocol error.\n",
1097 payload_length, conn->sess->sess_ops->FirstBurstLength);
1098 return iscsit_add_reject_cmd(cmd,
1099 ISCSI_REASON_BOOKMARK_INVALID, buf);
1102 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1103 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1106 cmd->data_direction = data_direction;
1107 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1109 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1111 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1112 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1113 sam_task_attr = TCM_SIMPLE_TAG;
1114 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1115 sam_task_attr = TCM_ORDERED_TAG;
1116 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1117 sam_task_attr = TCM_HEAD_TAG;
1118 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1119 sam_task_attr = TCM_ACA_TAG;
1121 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1122 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1123 sam_task_attr = TCM_SIMPLE_TAG;
1126 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1127 cmd->i_state = ISTATE_NEW_CMD;
1128 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1129 cmd->immediate_data = (payload_length) ? 1 : 0;
1130 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1131 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1132 if (cmd->unsolicited_data)
1133 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1135 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1136 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1137 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1139 cmd->targ_xfer_tag = 0xFFFFFFFF;
1140 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1141 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1142 cmd->first_burst_len = payload_length;
1144 if (!conn->sess->sess_ops->RDMAExtensions &&
1145 cmd->data_direction == DMA_FROM_DEVICE) {
1146 struct iscsi_datain_req *dr;
1148 dr = iscsit_allocate_datain_req();
1150 return iscsit_add_reject_cmd(cmd,
1151 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1153 iscsit_attach_datain_req(cmd, dr);
1157 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1159 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1160 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1161 cmd->data_direction, sam_task_attr,
1162 cmd->sense_buffer + 2);
1164 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1165 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1166 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1169 target_get_sess_cmd(&cmd->se_cmd, true);
1171 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1172 scsilun_to_int(&hdr->lun));
1173 if (cmd->sense_reason)
1176 /* only used for printks or comparing with ->ref_task_tag */
1177 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1178 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1179 if (cmd->sense_reason) {
1180 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1181 return iscsit_add_reject_cmd(cmd,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1188 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1189 return iscsit_add_reject_cmd(cmd,
1190 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1194 spin_lock_bh(&conn->cmd_lock);
1195 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1196 spin_unlock_bh(&conn->cmd_lock);
1198 * Check if we need to delay processing because of ALUA
1199 * Active/NonOptimized primary access state..
1201 core_alua_check_nonop_delay(&cmd->se_cmd);
1205 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1207 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1209 iscsit_set_dataout_sequence_values(cmd);
1211 spin_lock_bh(&cmd->dataout_timeout_lock);
1212 iscsit_start_dataout_timer(cmd, cmd->conn);
1213 spin_unlock_bh(&cmd->dataout_timeout_lock);
1215 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1217 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1218 struct iscsi_scsi_req *hdr)
1222 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1223 * the Immediate Bit is not set, and no Immediate
1226 * A PDU/CmdSN carrying Immediate Data can only
1227 * be processed after the DataCRC has passed.
1228 * If the DataCRC fails, the CmdSN MUST NOT
1229 * be acknowledged. (See below)
1231 if (!cmd->immediate_data) {
1232 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1233 (unsigned char *)hdr, hdr->cmdsn);
1234 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1236 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1237 target_put_sess_cmd(&cmd->se_cmd);
1242 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1245 * If no Immediate Data is attached, it's OK to return now.
1247 if (!cmd->immediate_data) {
1248 if (!cmd->sense_reason && cmd->unsolicited_data)
1249 iscsit_set_unsoliticed_dataout(cmd);
1250 if (!cmd->sense_reason)
1253 target_put_sess_cmd(&cmd->se_cmd);
1258 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1259 * execution. These exceptions are processed in CmdSN order using
1260 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1262 if (cmd->sense_reason) {
1263 if (cmd->reject_reason)
1269 * Call directly into transport_generic_new_cmd() to perform
1270 * the backend memory allocation.
1272 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1273 if (cmd->sense_reason)
1278 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1281 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1284 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1286 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1289 goto after_immediate_data;
1291 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1292 cmd->first_burst_len);
1293 after_immediate_data:
1294 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1296 * A PDU/CmdSN carrying Immediate Data passed
1297 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1298 * Immediate Bit is not set.
1300 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1301 (unsigned char *)hdr, hdr->cmdsn);
1302 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1305 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1308 rc = iscsit_dump_data_payload(cmd->conn,
1309 cmd->first_burst_len, 1);
1310 target_put_sess_cmd(&cmd->se_cmd);
1312 } else if (cmd->unsolicited_data)
1313 iscsit_set_unsoliticed_dataout(cmd);
1315 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1317 * Immediate Data failed DataCRC and ERL>=1,
1318 * silently drop this PDU and let the initiator
1319 * plug the CmdSN gap.
1321 * FIXME: Send Unsolicited NOPIN with reserved
1322 * TTT here to help the initiator figure out
1323 * the missing CmdSN, although they should be
1324 * intelligent enough to determine the missing
1325 * CmdSN and issue a retry to plug the sequence.
1327 cmd->i_state = ISTATE_REMOVE;
1328 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1329 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1336 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1339 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1341 bool dump_payload = false;
1343 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1347 * Allocation iovecs needed for struct socket operations for
1348 * traditional iSCSI block I/O.
1350 if (iscsit_allocate_iovecs(cmd) < 0) {
1351 return iscsit_reject_cmd(cmd,
1352 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1354 immed_data = cmd->immediate_data;
1356 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1360 dump_payload = true;
1365 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1368 static u32 iscsit_do_crypto_hash_sg(
1369 struct ahash_request *hash,
1370 struct iscsi_cmd *cmd,
1377 struct scatterlist *sg;
1378 unsigned int page_off;
1380 crypto_ahash_init(hash);
1382 sg = cmd->first_data_sg;
1383 page_off = cmd->first_data_sg_off;
1385 while (data_length) {
1386 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1388 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1389 crypto_ahash_update(hash);
1391 data_length -= cur_len;
1393 /* iscsit_map_iovec has already checked for invalid sg pointers */
1398 struct scatterlist pad_sg;
1400 sg_init_one(&pad_sg, pad_bytes, padding);
1401 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1403 crypto_ahash_finup(hash);
1405 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1406 crypto_ahash_final(hash);
1412 static void iscsit_do_crypto_hash_buf(
1413 struct ahash_request *hash,
1420 struct scatterlist sg[2];
1422 sg_init_table(sg, ARRAY_SIZE(sg));
1423 sg_set_buf(sg, buf, payload_length);
1424 sg_set_buf(sg + 1, pad_bytes, padding);
1426 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1428 crypto_ahash_digest(hash);
1432 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1433 struct iscsi_cmd **out_cmd)
1435 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1436 struct iscsi_cmd *cmd = NULL;
1437 struct se_cmd *se_cmd;
1438 u32 payload_length = ntoh24(hdr->dlength);
1441 if (!payload_length) {
1442 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1447 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1449 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1450 pr_err("DataSegmentLength: %u is greater than"
1451 " MaxXmitDataSegmentLength: %u\n", payload_length,
1452 conn->conn_ops->MaxXmitDataSegmentLength);
1453 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1457 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1462 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1463 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1464 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1465 payload_length, conn->cid);
1467 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1468 pr_err("Command ITT: 0x%08x received DataOUT after"
1469 " last DataOUT received, dumping payload\n",
1470 cmd->init_task_tag);
1471 return iscsit_dump_data_payload(conn, payload_length, 1);
1474 if (cmd->data_direction != DMA_TO_DEVICE) {
1475 pr_err("Command ITT: 0x%08x received DataOUT for a"
1476 " NON-WRITE command.\n", cmd->init_task_tag);
1477 return iscsit_dump_data_payload(conn, payload_length, 1);
1479 se_cmd = &cmd->se_cmd;
1480 iscsit_mod_dataout_timer(cmd);
1482 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1483 pr_err("DataOut Offset: %u, Length %u greater than"
1484 " iSCSI Command EDTL %u, protocol error.\n",
1485 hdr->offset, payload_length, cmd->se_cmd.data_length);
1486 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1489 if (cmd->unsolicited_data) {
1490 int dump_unsolicited_data = 0;
1492 if (conn->sess->sess_ops->InitialR2T) {
1493 pr_err("Received unexpected unsolicited data"
1494 " while InitialR2T=Yes, protocol error.\n");
1495 transport_send_check_condition_and_sense(&cmd->se_cmd,
1496 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1500 * Special case for dealing with Unsolicited DataOUT
1501 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1505 /* Something's amiss if we're not in WRITE_PENDING state... */
1506 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1507 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1508 dump_unsolicited_data = 1;
1510 if (dump_unsolicited_data) {
1512 * Check if a delayed TASK_ABORTED status needs to
1513 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1514 * received with the unsolicited data out.
1516 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1517 iscsit_stop_dataout_timer(cmd);
1519 transport_check_aborted_status(se_cmd,
1520 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1521 return iscsit_dump_data_payload(conn, payload_length, 1);
1525 * For the normal solicited data path:
1527 * Check for a delayed TASK_ABORTED status and dump any
1528 * incoming data out payload if one exists. Also, when the
1529 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1530 * data out sequence, we decrement outstanding_r2ts. Once
1531 * outstanding_r2ts reaches zero, go ahead and send the delayed
1532 * TASK_ABORTED status.
1534 if (se_cmd->transport_state & CMD_T_ABORTED) {
1535 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1536 if (--cmd->outstanding_r2ts < 1) {
1537 iscsit_stop_dataout_timer(cmd);
1538 transport_check_aborted_status(
1542 return iscsit_dump_data_payload(conn, payload_length, 1);
1546 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1547 * within-command recovery checks before receiving the payload.
1549 rc = iscsit_check_pre_dataout(cmd, buf);
1550 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1552 else if (rc == DATAOUT_CANNOT_RECOVER)
1558 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1561 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1562 struct iscsi_data *hdr)
1565 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1566 u32 payload_length = ntoh24(hdr->dlength);
1567 int iov_ret, data_crc_failed = 0;
1569 rx_size += payload_length;
1570 iov = &cmd->iov_data[0];
1572 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1577 iov_count += iov_ret;
1579 padding = ((-payload_length) & 3);
1581 iov[iov_count].iov_base = cmd->pad_bytes;
1582 iov[iov_count++].iov_len = padding;
1584 pr_debug("Receiving %u padding bytes.\n", padding);
1587 if (conn->conn_ops->DataDigest) {
1588 iov[iov_count].iov_base = &checksum;
1589 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1590 rx_size += ISCSI_CRC_LEN;
1593 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1595 iscsit_unmap_iovec(cmd);
1597 if (rx_got != rx_size)
1600 if (conn->conn_ops->DataDigest) {
1603 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1604 be32_to_cpu(hdr->offset),
1605 payload_length, padding,
1608 if (checksum != data_crc) {
1609 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1610 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1611 " does not match computed 0x%08x\n",
1612 hdr->itt, hdr->offset, payload_length,
1613 hdr->datasn, checksum, data_crc);
1614 data_crc_failed = 1;
1616 pr_debug("Got CRC32C DataDigest 0x%08x for"
1617 " %u bytes of Data Out\n", checksum,
1622 return data_crc_failed;
1626 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1627 bool data_crc_failed)
1629 struct iscsi_conn *conn = cmd->conn;
1632 * Increment post receive data and CRC values or perform
1633 * within-command recovery.
1635 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1636 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1638 else if (rc == DATAOUT_SEND_R2T) {
1639 iscsit_set_dataout_sequence_values(cmd);
1640 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1641 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1643 * Handle extra special case for out of order
1644 * Unsolicited Data Out.
1646 spin_lock_bh(&cmd->istate_lock);
1647 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1648 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1649 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1650 spin_unlock_bh(&cmd->istate_lock);
1652 iscsit_stop_dataout_timer(cmd);
1655 target_execute_cmd(&cmd->se_cmd);
1657 } else /* DATAOUT_CANNOT_RECOVER */
1662 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1664 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1666 struct iscsi_cmd *cmd = NULL;
1667 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1669 bool data_crc_failed = false;
1671 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1677 rc = iscsit_get_dataout(conn, cmd, hdr);
1681 data_crc_failed = true;
1683 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1686 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1687 struct iscsi_nopout *hdr)
1689 u32 payload_length = ntoh24(hdr->dlength);
1691 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1692 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1694 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1695 (unsigned char *)hdr);
1697 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1698 (unsigned char *)hdr);
1701 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1702 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1703 " not set, protocol error.\n");
1705 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1706 (unsigned char *)hdr);
1708 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1709 (unsigned char *)hdr);
1712 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1713 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1714 " greater than MaxXmitDataSegmentLength: %u, protocol"
1715 " error.\n", payload_length,
1716 conn->conn_ops->MaxXmitDataSegmentLength);
1718 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1719 (unsigned char *)hdr);
1721 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1722 (unsigned char *)hdr);
1725 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1726 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1727 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1728 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1731 * This is not a response to a Unsolicited NopIN, which means
1732 * it can either be a NOPOUT ping request (with a valid ITT),
1733 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1734 * Either way, make sure we allocate an struct iscsi_cmd, as both
1735 * can contain ping data.
1737 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1738 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1739 cmd->i_state = ISTATE_SEND_NOPIN;
1740 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1742 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1743 cmd->targ_xfer_tag = 0xFFFFFFFF;
1744 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1745 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1746 cmd->data_direction = DMA_NONE;
1751 EXPORT_SYMBOL(iscsit_setup_nop_out);
1753 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1754 struct iscsi_nopout *hdr)
1756 struct iscsi_cmd *cmd_p = NULL;
1759 * Initiator is expecting a NopIN ping reply..
1761 if (hdr->itt != RESERVED_ITT) {
1763 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1764 (unsigned char *)hdr);
1766 spin_lock_bh(&conn->cmd_lock);
1767 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1768 spin_unlock_bh(&conn->cmd_lock);
1770 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1772 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1773 iscsit_add_cmd_to_response_queue(cmd, conn,
1778 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1779 (unsigned char *)hdr, hdr->cmdsn);
1780 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1782 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1788 * This was a response to a unsolicited NOPIN ping.
1790 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1791 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1795 iscsit_stop_nopin_response_timer(conn);
1797 cmd_p->i_state = ISTATE_REMOVE;
1798 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1800 iscsit_start_nopin_timer(conn);
1804 * Otherwise, initiator is not expecting a NOPIN is response.
1805 * Just ignore for now.
1809 iscsit_free_cmd(cmd, false);
1813 EXPORT_SYMBOL(iscsit_process_nop_out);
1815 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1818 unsigned char *ping_data = NULL;
1819 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1820 struct kvec *iov = NULL;
1821 u32 payload_length = ntoh24(hdr->dlength);
1824 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1828 * Handle NOP-OUT payload for traditional iSCSI sockets
1830 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1831 u32 checksum, data_crc, padding = 0;
1832 int niov = 0, rx_got, rx_size = payload_length;
1834 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1836 pr_err("Unable to allocate memory for"
1837 " NOPOUT ping data.\n");
1842 iov = &cmd->iov_misc[0];
1843 iov[niov].iov_base = ping_data;
1844 iov[niov++].iov_len = payload_length;
1846 padding = ((-payload_length) & 3);
1848 pr_debug("Receiving %u additional bytes"
1849 " for padding.\n", padding);
1850 iov[niov].iov_base = &cmd->pad_bytes;
1851 iov[niov++].iov_len = padding;
1854 if (conn->conn_ops->DataDigest) {
1855 iov[niov].iov_base = &checksum;
1856 iov[niov++].iov_len = ISCSI_CRC_LEN;
1857 rx_size += ISCSI_CRC_LEN;
1860 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1861 if (rx_got != rx_size) {
1866 if (conn->conn_ops->DataDigest) {
1867 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1868 ping_data, payload_length,
1869 padding, cmd->pad_bytes,
1872 if (checksum != data_crc) {
1873 pr_err("Ping data CRC32C DataDigest"
1874 " 0x%08x does not match computed 0x%08x\n",
1875 checksum, data_crc);
1876 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1877 pr_err("Unable to recover from"
1878 " NOPOUT Ping DataCRC failure while in"
1884 * Silently drop this PDU and let the
1885 * initiator plug the CmdSN gap.
1887 pr_debug("Dropping NOPOUT"
1888 " Command CmdSN: 0x%08x due to"
1889 " DataCRC error.\n", hdr->cmdsn);
1894 pr_debug("Got CRC32C DataDigest"
1895 " 0x%08x for %u bytes of ping data.\n",
1896 checksum, payload_length);
1900 ping_data[payload_length] = '\0';
1902 * Attach ping data to struct iscsi_cmd->buf_ptr.
1904 cmd->buf_ptr = ping_data;
1905 cmd->buf_ptr_size = payload_length;
1907 pr_debug("Got %u bytes of NOPOUT ping"
1908 " data.\n", payload_length);
1909 pr_debug("Ping Data: \"%s\"\n", ping_data);
1912 return iscsit_process_nop_out(conn, cmd, hdr);
1915 iscsit_free_cmd(cmd, false);
1922 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1925 struct se_tmr_req *se_tmr;
1926 struct iscsi_tmr_req *tmr_req;
1927 struct iscsi_tm *hdr;
1928 int out_of_order_cmdsn = 0, ret;
1929 bool sess_ref = false;
1932 hdr = (struct iscsi_tm *) buf;
1933 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1934 function = hdr->flags;
1936 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1937 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1938 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1939 hdr->rtt, hdr->refcmdsn, conn->cid);
1941 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1942 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1943 hdr->rtt != RESERVED_ITT)) {
1944 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1945 hdr->rtt = RESERVED_ITT;
1948 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1949 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1950 pr_err("Task Management Request TASK_REASSIGN not"
1951 " issued as immediate command, bad iSCSI Initiator"
1952 "implementation\n");
1953 return iscsit_add_reject_cmd(cmd,
1954 ISCSI_REASON_PROTOCOL_ERROR, buf);
1956 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1957 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1958 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1960 cmd->data_direction = DMA_NONE;
1962 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1963 if (!cmd->tmr_req) {
1964 pr_err("Unable to allocate memory for"
1965 " Task Management command!\n");
1966 return iscsit_add_reject_cmd(cmd,
1967 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1972 * TASK_REASSIGN for ERL=2 / connection stays inside of
1973 * LIO-Target $FABRIC_MOD
1975 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1980 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1981 conn->sess->se_sess, 0, DMA_NONE,
1982 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1984 target_get_sess_cmd(&cmd->se_cmd, true);
1988 case ISCSI_TM_FUNC_ABORT_TASK:
1989 tcm_function = TMR_ABORT_TASK;
1991 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1992 tcm_function = TMR_ABORT_TASK_SET;
1994 case ISCSI_TM_FUNC_CLEAR_ACA:
1995 tcm_function = TMR_CLEAR_ACA;
1997 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1998 tcm_function = TMR_CLEAR_TASK_SET;
2000 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2001 tcm_function = TMR_LUN_RESET;
2003 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2004 tcm_function = TMR_TARGET_WARM_RESET;
2006 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2007 tcm_function = TMR_TARGET_COLD_RESET;
2010 pr_err("Unknown iSCSI TMR Function:"
2011 " 0x%02x\n", function);
2012 return iscsit_add_reject_cmd(cmd,
2013 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2016 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
2017 tcm_function, GFP_KERNEL);
2019 return iscsit_add_reject_cmd(cmd,
2020 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2022 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2025 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2026 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2027 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2028 cmd->init_task_tag = hdr->itt;
2029 cmd->targ_xfer_tag = 0xFFFFFFFF;
2030 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2031 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2032 se_tmr = cmd->se_cmd.se_tmr_req;
2033 tmr_req = cmd->tmr_req;
2035 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2037 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2038 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2039 scsilun_to_int(&hdr->lun));
2041 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2047 case ISCSI_TM_FUNC_ABORT_TASK:
2048 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2049 if (se_tmr->response)
2052 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2053 case ISCSI_TM_FUNC_CLEAR_ACA:
2054 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2055 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2057 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2058 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2059 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2063 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2064 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2065 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2069 case ISCSI_TM_FUNC_TASK_REASSIGN:
2070 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2072 * Perform sanity checks on the ExpDataSN only if the
2073 * TASK_REASSIGN was successful.
2075 if (se_tmr->response)
2078 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2079 return iscsit_add_reject_cmd(cmd,
2080 ISCSI_REASON_BOOKMARK_INVALID, buf);
2083 pr_err("Unknown TMR function: 0x%02x, protocol"
2084 " error.\n", function);
2085 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2089 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2090 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2091 se_tmr->call_transport = 1;
2093 spin_lock_bh(&conn->cmd_lock);
2094 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2095 spin_unlock_bh(&conn->cmd_lock);
2097 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2098 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2099 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2100 out_of_order_cmdsn = 1;
2101 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2103 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2106 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2108 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2111 * Found the referenced task, send to transport for processing.
2113 if (se_tmr->call_transport)
2114 return transport_generic_handle_tmr(&cmd->se_cmd);
2117 * Could not find the referenced LUN, task, or Task Management
2118 * command not authorized or supported. Change state and
2119 * let the tx_thread send the response.
2121 * For connection recovery, this is also the default action for
2122 * TMR TASK_REASSIGN.
2125 pr_debug("Handle TMR, using sess_ref=true check\n");
2126 target_put_sess_cmd(&cmd->se_cmd);
2129 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2132 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2134 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2136 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2137 struct iscsi_text *hdr)
2139 u32 payload_length = ntoh24(hdr->dlength);
2141 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2142 pr_err("Unable to accept text parameter length: %u"
2143 "greater than MaxXmitDataSegmentLength %u.\n",
2144 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2145 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2146 (unsigned char *)hdr);
2149 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2150 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2151 pr_err("Multi sequence text commands currently not supported\n");
2152 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2153 (unsigned char *)hdr);
2156 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2157 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2158 hdr->exp_statsn, payload_length);
2160 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2161 cmd->i_state = ISTATE_SEND_TEXTRSP;
2162 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2163 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2164 cmd->targ_xfer_tag = 0xFFFFFFFF;
2165 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2166 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2167 cmd->data_direction = DMA_NONE;
2168 cmd->text_in_ptr = NULL;
2172 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2175 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2176 struct iscsi_text *hdr)
2178 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2182 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2183 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2184 pr_err("Unable to locate text_in buffer for sendtargets"
2188 goto empty_sendtargets;
2190 if (strncmp("SendTargets", text_in, 11) != 0) {
2191 pr_err("Received Text Data that is not"
2192 " SendTargets, cannot continue.\n");
2195 text_ptr = strchr(text_in, '=');
2197 pr_err("No \"=\" separator found in Text Data,"
2198 " cannot continue.\n");
2201 if (!strncmp("=All", text_ptr, 4)) {
2202 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2203 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2204 !strncmp("=eui.", text_ptr, 5)) {
2205 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2207 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2211 spin_lock_bh(&conn->cmd_lock);
2212 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2213 spin_unlock_bh(&conn->cmd_lock);
2216 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2218 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2219 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2220 (unsigned char *)hdr, hdr->cmdsn);
2221 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2227 return iscsit_execute_cmd(cmd, 0);
2230 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2231 (unsigned char *)hdr);
2233 EXPORT_SYMBOL(iscsit_process_text_cmd);
2236 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2239 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2240 char *text_in = NULL;
2241 u32 payload_length = ntoh24(hdr->dlength);
2244 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2248 rx_size = payload_length;
2249 if (payload_length) {
2250 u32 checksum = 0, data_crc = 0;
2251 u32 padding = 0, pad_bytes = 0;
2252 int niov = 0, rx_got;
2255 text_in = kzalloc(payload_length, GFP_KERNEL);
2257 pr_err("Unable to allocate memory for"
2258 " incoming text parameters\n");
2261 cmd->text_in_ptr = text_in;
2263 memset(iov, 0, 3 * sizeof(struct kvec));
2264 iov[niov].iov_base = text_in;
2265 iov[niov++].iov_len = payload_length;
2267 padding = ((-payload_length) & 3);
2269 iov[niov].iov_base = &pad_bytes;
2270 iov[niov++].iov_len = padding;
2272 pr_debug("Receiving %u additional bytes"
2273 " for padding.\n", padding);
2275 if (conn->conn_ops->DataDigest) {
2276 iov[niov].iov_base = &checksum;
2277 iov[niov++].iov_len = ISCSI_CRC_LEN;
2278 rx_size += ISCSI_CRC_LEN;
2281 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2282 if (rx_got != rx_size)
2285 if (conn->conn_ops->DataDigest) {
2286 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2287 text_in, payload_length,
2288 padding, (u8 *)&pad_bytes,
2291 if (checksum != data_crc) {
2292 pr_err("Text data CRC32C DataDigest"
2293 " 0x%08x does not match computed"
2294 " 0x%08x\n", checksum, data_crc);
2295 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2296 pr_err("Unable to recover from"
2297 " Text Data digest failure while in"
2302 * Silently drop this PDU and let the
2303 * initiator plug the CmdSN gap.
2305 pr_debug("Dropping Text"
2306 " Command CmdSN: 0x%08x due to"
2307 " DataCRC error.\n", hdr->cmdsn);
2312 pr_debug("Got CRC32C DataDigest"
2313 " 0x%08x for %u bytes of text data.\n",
2314 checksum, payload_length);
2317 text_in[payload_length - 1] = '\0';
2318 pr_debug("Successfully read %d bytes of text"
2319 " data.\n", payload_length);
2322 return iscsit_process_text_cmd(conn, cmd, hdr);
2325 kfree(cmd->text_in_ptr);
2326 cmd->text_in_ptr = NULL;
2327 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2330 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2332 struct iscsi_conn *conn_p;
2333 struct iscsi_session *sess = conn->sess;
2335 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2336 " for SID: %u.\n", conn->cid, conn->sess->sid);
2338 atomic_set(&sess->session_logout, 1);
2339 atomic_set(&conn->conn_logout_remove, 1);
2340 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2342 iscsit_inc_conn_usage_count(conn);
2343 iscsit_inc_session_usage_count(sess);
2345 spin_lock_bh(&sess->conn_lock);
2346 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2347 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2350 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2351 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2353 spin_unlock_bh(&sess->conn_lock);
2355 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2360 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2362 struct iscsi_conn *l_conn;
2363 struct iscsi_session *sess = conn->sess;
2365 pr_debug("Received logout request CLOSECONNECTION for CID:"
2366 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2369 * A Logout Request with a CLOSECONNECTION reason code for a CID
2370 * can arrive on a connection with a differing CID.
2372 if (conn->cid == cmd->logout_cid) {
2373 spin_lock_bh(&conn->state_lock);
2374 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2375 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2377 atomic_set(&conn->conn_logout_remove, 1);
2378 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2379 iscsit_inc_conn_usage_count(conn);
2381 spin_unlock_bh(&conn->state_lock);
2384 * Handle all different cid CLOSECONNECTION requests in
2385 * iscsit_logout_post_handler_diffcid() as to give enough
2386 * time for any non immediate command's CmdSN to be
2387 * acknowledged on the connection in question.
2389 * Here we simply make sure the CID is still around.
2391 l_conn = iscsit_get_conn_from_cid(sess,
2394 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2395 iscsit_add_cmd_to_response_queue(cmd, conn,
2400 iscsit_dec_conn_usage_count(l_conn);
2403 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2408 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2410 struct iscsi_session *sess = conn->sess;
2412 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2413 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2415 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2416 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2417 " while ERL!=2.\n");
2418 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2419 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2423 if (conn->cid == cmd->logout_cid) {
2424 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2425 " with CID: %hu on CID: %hu, implementation error.\n",
2426 cmd->logout_cid, conn->cid);
2427 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2438 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2441 int cmdsn_ret, logout_remove = 0;
2443 struct iscsi_logout *hdr;
2444 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2446 hdr = (struct iscsi_logout *) buf;
2447 reason_code = (hdr->flags & 0x7f);
2450 spin_lock(&tiqn->logout_stats.lock);
2451 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2452 tiqn->logout_stats.normal_logouts++;
2454 tiqn->logout_stats.abnormal_logouts++;
2455 spin_unlock(&tiqn->logout_stats.lock);
2458 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2459 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2460 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2461 hdr->cid, conn->cid);
2463 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2464 pr_err("Received logout request on connection that"
2465 " is not in logged in state, ignoring request.\n");
2466 iscsit_free_cmd(cmd, false);
2470 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2471 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2472 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2473 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2474 cmd->targ_xfer_tag = 0xFFFFFFFF;
2475 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2476 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2477 cmd->logout_cid = be16_to_cpu(hdr->cid);
2478 cmd->logout_reason = reason_code;
2479 cmd->data_direction = DMA_NONE;
2482 * We need to sleep in these cases (by returning 1) until the Logout
2483 * Response gets sent in the tx thread.
2485 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2486 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2487 be16_to_cpu(hdr->cid) == conn->cid))
2490 spin_lock_bh(&conn->cmd_lock);
2491 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2492 spin_unlock_bh(&conn->cmd_lock);
2494 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2495 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2498 * Immediate commands are executed, well, immediately.
2499 * Non-Immediate Logout Commands are executed in CmdSN order.
2501 if (cmd->immediate_cmd) {
2502 int ret = iscsit_execute_cmd(cmd, 0);
2507 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2508 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2510 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2514 return logout_remove;
2516 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2518 int iscsit_handle_snack(
2519 struct iscsi_conn *conn,
2522 struct iscsi_snack *hdr;
2524 hdr = (struct iscsi_snack *) buf;
2525 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2527 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2528 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2529 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2530 hdr->begrun, hdr->runlength, conn->cid);
2532 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2533 pr_err("Initiator sent SNACK request while in"
2534 " ErrorRecoveryLevel=0.\n");
2535 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2539 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2540 * call from inside iscsi_send_recovery_datain_or_r2t().
2542 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2544 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2546 be32_to_cpu(hdr->ttt),
2547 be32_to_cpu(hdr->begrun),
2548 be32_to_cpu(hdr->runlength));
2549 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2550 return iscsit_handle_status_snack(conn, hdr->itt,
2551 be32_to_cpu(hdr->ttt),
2552 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2553 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2554 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2555 be32_to_cpu(hdr->begrun),
2556 be32_to_cpu(hdr->runlength));
2557 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2558 /* FIXME: Support R-Data SNACK */
2559 pr_err("R-Data SNACK Not Supported.\n");
2560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2563 pr_err("Unknown SNACK type 0x%02x, protocol"
2564 " error.\n", hdr->flags & 0x0f);
2565 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2571 EXPORT_SYMBOL(iscsit_handle_snack);
2573 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2575 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2576 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2577 wait_for_completion_interruptible_timeout(
2578 &conn->rx_half_close_comp,
2579 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2583 static int iscsit_handle_immediate_data(
2584 struct iscsi_cmd *cmd,
2585 struct iscsi_scsi_req *hdr,
2588 int iov_ret, rx_got = 0, rx_size = 0;
2589 u32 checksum, iov_count = 0, padding = 0;
2590 struct iscsi_conn *conn = cmd->conn;
2593 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2595 return IMMEDIATE_DATA_CANNOT_RECOVER;
2598 iov_count = iov_ret;
2599 iov = &cmd->iov_data[0];
2601 padding = ((-length) & 3);
2603 iov[iov_count].iov_base = cmd->pad_bytes;
2604 iov[iov_count++].iov_len = padding;
2608 if (conn->conn_ops->DataDigest) {
2609 iov[iov_count].iov_base = &checksum;
2610 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2611 rx_size += ISCSI_CRC_LEN;
2614 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2616 iscsit_unmap_iovec(cmd);
2618 if (rx_got != rx_size) {
2619 iscsit_rx_thread_wait_for_tcp(conn);
2620 return IMMEDIATE_DATA_CANNOT_RECOVER;
2623 if (conn->conn_ops->DataDigest) {
2626 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2627 cmd->write_data_done, length, padding,
2630 if (checksum != data_crc) {
2631 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2632 " does not match computed 0x%08x\n", checksum,
2635 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2636 pr_err("Unable to recover from"
2637 " Immediate Data digest failure while"
2639 iscsit_reject_cmd(cmd,
2640 ISCSI_REASON_DATA_DIGEST_ERROR,
2641 (unsigned char *)hdr);
2642 return IMMEDIATE_DATA_CANNOT_RECOVER;
2644 iscsit_reject_cmd(cmd,
2645 ISCSI_REASON_DATA_DIGEST_ERROR,
2646 (unsigned char *)hdr);
2647 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2650 pr_debug("Got CRC32C DataDigest 0x%08x for"
2651 " %u bytes of Immediate Data\n", checksum,
2656 cmd->write_data_done += length;
2658 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2659 spin_lock_bh(&cmd->istate_lock);
2660 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2661 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2662 spin_unlock_bh(&cmd->istate_lock);
2665 return IMMEDIATE_DATA_NORMAL_OPERATION;
2669 * Called with sess->conn_lock held.
2671 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2672 with active network interface */
2673 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2675 struct iscsi_cmd *cmd;
2676 struct iscsi_conn *conn_p;
2680 * Only send a Asynchronous Message on connections whos network
2681 * interface is still functional.
2683 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2684 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2685 iscsit_inc_conn_usage_count(conn_p);
2694 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2696 iscsit_dec_conn_usage_count(conn_p);
2700 cmd->logout_cid = conn->cid;
2701 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2702 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2704 spin_lock_bh(&conn_p->cmd_lock);
2705 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2706 spin_unlock_bh(&conn_p->cmd_lock);
2708 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2709 iscsit_dec_conn_usage_count(conn_p);
2712 static int iscsit_send_conn_drop_async_message(
2713 struct iscsi_cmd *cmd,
2714 struct iscsi_conn *conn)
2716 struct iscsi_async *hdr;
2718 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2720 hdr = (struct iscsi_async *) cmd->pdu;
2721 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2722 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2723 cmd->init_task_tag = RESERVED_ITT;
2724 cmd->targ_xfer_tag = 0xFFFFFFFF;
2725 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2726 cmd->stat_sn = conn->stat_sn++;
2727 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2728 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2729 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2730 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2731 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2732 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2733 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2735 pr_debug("Sending Connection Dropped Async Message StatSN:"
2736 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2737 cmd->logout_cid, conn->cid);
2739 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2742 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2744 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2745 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2746 wait_for_completion_interruptible_timeout(
2747 &conn->tx_half_close_comp,
2748 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2753 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2754 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2757 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2758 hdr->flags = datain->flags;
2759 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2760 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2761 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2762 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2763 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2764 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2765 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2768 hton24(hdr->dlength, datain->length);
2769 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2770 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2771 (struct scsi_lun *)&hdr->lun);
2773 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2775 hdr->itt = cmd->init_task_tag;
2777 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2778 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2780 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2782 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2784 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2786 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2787 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2788 hdr->datasn = cpu_to_be32(datain->data_sn);
2789 hdr->offset = cpu_to_be32(datain->offset);
2791 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2792 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2793 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2794 ntohl(hdr->offset), datain->length, conn->cid);
2796 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2798 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2800 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2801 struct iscsi_datain datain;
2802 struct iscsi_datain_req *dr;
2804 bool set_statsn = false;
2806 memset(&datain, 0, sizeof(struct iscsi_datain));
2807 dr = iscsit_get_datain_values(cmd, &datain);
2809 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2810 cmd->init_task_tag);
2814 * Be paranoid and double check the logic for now.
2816 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2817 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2818 " datain.length: %u exceeds cmd->data_length: %u\n",
2819 cmd->init_task_tag, datain.offset, datain.length,
2820 cmd->se_cmd.data_length);
2824 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2826 * Special case for successfully execution w/ both DATAIN
2829 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2830 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2831 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2833 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2834 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2835 iscsit_increment_maxcmdsn(cmd, conn->sess);
2836 cmd->stat_sn = conn->stat_sn++;
2838 } else if (dr->dr_complete ==
2839 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2843 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2845 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2849 if (dr->dr_complete) {
2850 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2852 iscsit_free_datain_req(cmd, dr);
2859 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2860 struct iscsi_logout_rsp *hdr)
2862 struct iscsi_conn *logout_conn = NULL;
2863 struct iscsi_conn_recovery *cr = NULL;
2864 struct iscsi_session *sess = conn->sess;
2866 * The actual shutting down of Sessions and/or Connections
2867 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2868 * is done in scsi_logout_post_handler().
2870 switch (cmd->logout_reason) {
2871 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2872 pr_debug("iSCSI session logout successful, setting"
2873 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2874 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2876 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2877 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2880 * For CLOSECONNECTION logout requests carrying
2881 * a matching logout CID -> local CID, the reference
2882 * for the local CID will have been incremented in
2883 * iscsi_logout_closeconnection().
2885 * For CLOSECONNECTION logout requests carrying
2886 * a different CID than the connection it arrived
2887 * on, the connection responding to cmd->logout_cid
2888 * is stopped in iscsit_logout_post_handler_diffcid().
2891 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2892 " successful.\n", cmd->logout_cid, conn->cid);
2893 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2895 case ISCSI_LOGOUT_REASON_RECOVERY:
2896 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2897 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2900 * If the connection is still active from our point of view
2901 * force connection recovery to occur.
2903 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2906 iscsit_connection_reinstatement_rcfr(logout_conn);
2907 iscsit_dec_conn_usage_count(logout_conn);
2910 cr = iscsit_get_inactive_connection_recovery_entry(
2911 conn->sess, cmd->logout_cid);
2913 pr_err("Unable to locate CID: %hu for"
2914 " REMOVECONNFORRECOVERY Logout Request.\n",
2916 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2920 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2922 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2923 " for recovery for CID: %hu on CID: %hu successful.\n",
2924 cmd->logout_cid, conn->cid);
2925 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2928 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2929 cmd->logout_reason);
2933 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2934 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2935 hdr->response = cmd->logout_response;
2936 hdr->itt = cmd->init_task_tag;
2937 cmd->stat_sn = conn->stat_sn++;
2938 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2940 iscsit_increment_maxcmdsn(cmd, conn->sess);
2941 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2942 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2944 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2945 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2946 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2947 cmd->logout_cid, conn->cid);
2951 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2954 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2958 rc = iscsit_build_logout_rsp(cmd, conn,
2959 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2963 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2967 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2968 struct iscsi_nopin *hdr, bool nopout_response)
2970 hdr->opcode = ISCSI_OP_NOOP_IN;
2971 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2972 hton24(hdr->dlength, cmd->buf_ptr_size);
2973 if (nopout_response)
2974 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2975 hdr->itt = cmd->init_task_tag;
2976 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2977 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2979 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2981 if (nopout_response)
2982 iscsit_increment_maxcmdsn(cmd, conn->sess);
2984 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2985 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2987 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2988 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2989 "Solicited" : "Unsolicited", cmd->init_task_tag,
2990 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2992 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2995 * Unsolicited NOPIN, either requesting a response or not.
2997 static int iscsit_send_unsolicited_nopin(
2998 struct iscsi_cmd *cmd,
2999 struct iscsi_conn *conn,
3002 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3005 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3007 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3008 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3010 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3014 spin_lock_bh(&cmd->istate_lock);
3015 cmd->i_state = want_response ?
3016 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3017 spin_unlock_bh(&cmd->istate_lock);
3023 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3025 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3027 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3030 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3031 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3033 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3035 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3040 static int iscsit_send_r2t(
3041 struct iscsi_cmd *cmd,
3042 struct iscsi_conn *conn)
3044 struct iscsi_r2t *r2t;
3045 struct iscsi_r2t_rsp *hdr;
3048 r2t = iscsit_get_r2t_from_list(cmd);
3052 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3053 memset(hdr, 0, ISCSI_HDR_LEN);
3054 hdr->opcode = ISCSI_OP_R2T;
3055 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3056 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3057 (struct scsi_lun *)&hdr->lun);
3058 hdr->itt = cmd->init_task_tag;
3059 if (conn->conn_transport->iscsit_get_r2t_ttt)
3060 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3062 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3063 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3064 hdr->statsn = cpu_to_be32(conn->stat_sn);
3065 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3066 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3067 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3068 hdr->data_offset = cpu_to_be32(r2t->offset);
3069 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3071 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3072 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3073 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3074 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3075 r2t->offset, r2t->xfer_len, conn->cid);
3077 spin_lock_bh(&cmd->r2t_lock);
3079 spin_unlock_bh(&cmd->r2t_lock);
3081 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3086 spin_lock_bh(&cmd->dataout_timeout_lock);
3087 iscsit_start_dataout_timer(cmd, conn);
3088 spin_unlock_bh(&cmd->dataout_timeout_lock);
3094 * @recovery: If called from iscsi_task_reassign_complete_write() for
3095 * connection recovery.
3097 int iscsit_build_r2ts_for_cmd(
3098 struct iscsi_conn *conn,
3099 struct iscsi_cmd *cmd,
3103 u32 offset = 0, xfer_len = 0;
3105 spin_lock_bh(&cmd->r2t_lock);
3106 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3107 spin_unlock_bh(&cmd->r2t_lock);
3111 if (conn->sess->sess_ops->DataSequenceInOrder &&
3113 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3115 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3116 if (conn->sess->sess_ops->DataSequenceInOrder) {
3117 offset = cmd->r2t_offset;
3119 if (first_r2t && recovery) {
3120 int new_data_end = offset +
3121 conn->sess->sess_ops->MaxBurstLength -
3122 cmd->next_burst_len;
3124 if (new_data_end > cmd->se_cmd.data_length)
3125 xfer_len = cmd->se_cmd.data_length - offset;
3128 conn->sess->sess_ops->MaxBurstLength -
3129 cmd->next_burst_len;
3131 int new_data_end = offset +
3132 conn->sess->sess_ops->MaxBurstLength;
3134 if (new_data_end > cmd->se_cmd.data_length)
3135 xfer_len = cmd->se_cmd.data_length - offset;
3137 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3139 cmd->r2t_offset += xfer_len;
3141 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3144 struct iscsi_seq *seq;
3146 seq = iscsit_get_seq_holder_for_r2t(cmd);
3148 spin_unlock_bh(&cmd->r2t_lock);
3152 offset = seq->offset;
3153 xfer_len = seq->xfer_len;
3155 if (cmd->seq_send_order == cmd->seq_count)
3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3158 cmd->outstanding_r2ts++;
3161 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3162 spin_unlock_bh(&cmd->r2t_lock);
3166 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3169 spin_unlock_bh(&cmd->r2t_lock);
3173 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3175 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3176 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3179 cmd->stat_sn = conn->stat_sn++;
3181 atomic_long_inc(&conn->sess->rsp_pdus);
3183 memset(hdr, 0, ISCSI_HDR_LEN);
3184 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3185 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3186 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3187 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3188 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3189 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3190 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3191 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3193 hdr->response = cmd->iscsi_response;
3194 hdr->cmd_status = cmd->se_cmd.scsi_status;
3195 hdr->itt = cmd->init_task_tag;
3196 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3198 iscsit_increment_maxcmdsn(cmd, conn->sess);
3199 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3200 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3202 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3203 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3204 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3205 cmd->se_cmd.scsi_status, conn->cid);
3207 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3209 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3211 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3212 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3213 void *data_buf = NULL;
3214 u32 padding = 0, data_buf_len = 0;
3216 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3219 * Attach SENSE DATA payload to iSCSI Response PDU
3221 if (cmd->se_cmd.sense_buffer &&
3222 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3223 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3224 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3225 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3227 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3228 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3229 data_buf = cmd->sense_buffer;
3230 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3233 memset(cmd->sense_buffer +
3234 cmd->se_cmd.scsi_sense_length, 0, padding);
3235 pr_debug("Adding %u bytes of padding to"
3236 " SENSE.\n", padding);
3239 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3241 cmd->se_cmd.scsi_sense_length);
3244 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3248 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3250 switch (se_tmr->response) {
3251 case TMR_FUNCTION_COMPLETE:
3252 return ISCSI_TMF_RSP_COMPLETE;
3253 case TMR_TASK_DOES_NOT_EXIST:
3254 return ISCSI_TMF_RSP_NO_TASK;
3255 case TMR_LUN_DOES_NOT_EXIST:
3256 return ISCSI_TMF_RSP_NO_LUN;
3257 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3258 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3259 case TMR_FUNCTION_REJECTED:
3261 return ISCSI_TMF_RSP_REJECTED;
3266 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3267 struct iscsi_tm_rsp *hdr)
3269 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3271 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3272 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3273 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3274 hdr->itt = cmd->init_task_tag;
3275 cmd->stat_sn = conn->stat_sn++;
3276 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3278 iscsit_increment_maxcmdsn(cmd, conn->sess);
3279 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3280 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3282 pr_debug("Built Task Management Response ITT: 0x%08x,"
3283 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3284 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3286 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3289 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3291 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3293 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3295 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3298 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3302 if (np->np_sockaddr.ss_family == AF_INET6) {
3303 const struct sockaddr_in6 sin6 = {
3304 .sin6_addr = IN6ADDR_ANY_INIT };
3305 struct sockaddr_in6 *sock_in6 =
3306 (struct sockaddr_in6 *)&np->np_sockaddr;
3308 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3309 sin6.sin6_addr.s6_addr, 16))
3312 struct sockaddr_in * sock_in =
3313 (struct sockaddr_in *)&np->np_sockaddr;
3315 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
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);
3345 pr_err("Unable to allocate memory for sendtargets"
3350 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3353 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3354 text_ptr = strchr(text_in, '=');
3356 pr_err("Unable to locate '=' string in text_in:"
3362 * Skip over '=' character..
3367 spin_lock(&tiqn_lock);
3368 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3369 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3370 strcmp(tiqn->tiqn, text_ptr)) {
3374 target_name_printed = 0;
3376 spin_lock(&tiqn->tiqn_tpg_lock);
3377 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3379 /* If demo_mode_discovery=0 and generate_node_acls=0
3380 * (demo mode dislabed) do not return
3381 * TargetName+TargetAddress unless a NodeACL exists.
3384 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3385 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3386 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3387 cmd->conn->sess->sess_ops->InitiatorName))) {
3391 spin_lock(&tpg->tpg_state_lock);
3392 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3393 spin_unlock(&tpg->tpg_state_lock);
3395 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3398 spin_lock(&tpg->tpg_np_lock);
3399 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3401 struct iscsi_np *np = tpg_np->tpg_np;
3402 bool inaddr_any = iscsit_check_inaddr_any(np);
3403 struct sockaddr_storage *sockaddr;
3405 if (np->np_network_transport != network_transport)
3408 if (!target_name_printed) {
3409 len = sprintf(buf, "TargetName=%s",
3413 if ((len + payload_len) > buffer_len) {
3414 spin_unlock(&tpg->tpg_np_lock);
3415 spin_unlock(&tiqn->tiqn_tpg_lock);
3420 if (skip_bytes && len <= skip_bytes) {
3423 memcpy(payload + payload_len, buf, len);
3425 target_name_printed = 1;
3426 if (len > skip_bytes)
3432 sockaddr = &conn->local_sockaddr;
3434 sockaddr = &np->np_sockaddr;
3436 len = sprintf(buf, "TargetAddress="
3442 if ((len + payload_len) > buffer_len) {
3443 spin_unlock(&tpg->tpg_np_lock);
3444 spin_unlock(&tiqn->tiqn_tpg_lock);
3449 if (skip_bytes && len <= skip_bytes) {
3452 memcpy(payload + payload_len, buf, len);
3454 if (len > skip_bytes)
3458 spin_unlock(&tpg->tpg_np_lock);
3460 spin_unlock(&tiqn->tiqn_tpg_lock);
3467 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3470 spin_unlock(&tiqn_lock);
3472 cmd->buf_ptr = payload;
3478 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3479 struct iscsi_text_rsp *hdr,
3480 enum iscsit_transport_type network_transport)
3482 int text_length, padding;
3483 bool completed = true;
3485 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3486 cmd->read_data_done,
3488 if (text_length < 0)
3492 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3494 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3495 cmd->read_data_done += text_length;
3496 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3497 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3499 hdr->opcode = ISCSI_OP_TEXT_RSP;
3500 padding = ((-text_length) & 3);
3501 hton24(hdr->dlength, text_length);
3502 hdr->itt = cmd->init_task_tag;
3503 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3504 cmd->stat_sn = conn->stat_sn++;
3505 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3507 iscsit_increment_maxcmdsn(cmd, conn->sess);
3509 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3510 * correctly increment MaxCmdSN for each response answering a
3511 * non immediate text request with a valid CmdSN.
3513 cmd->maxcmdsn_inc = 0;
3514 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3515 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3517 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3518 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3519 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3520 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3521 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3523 return text_length + padding;
3525 EXPORT_SYMBOL(iscsit_build_text_rsp);
3527 static int iscsit_send_text_rsp(
3528 struct iscsi_cmd *cmd,
3529 struct iscsi_conn *conn)
3531 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3534 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3535 conn->conn_transport->transport_type);
3536 if (text_length < 0)
3539 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3545 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3546 struct iscsi_reject *hdr)
3548 hdr->opcode = ISCSI_OP_REJECT;
3549 hdr->reason = cmd->reject_reason;
3550 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3551 hton24(hdr->dlength, ISCSI_HDR_LEN);
3552 hdr->ffffffff = cpu_to_be32(0xffffffff);
3553 cmd->stat_sn = conn->stat_sn++;
3554 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3555 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3556 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3559 EXPORT_SYMBOL(iscsit_build_reject);
3561 static int iscsit_send_reject(
3562 struct iscsi_cmd *cmd,
3563 struct iscsi_conn *conn)
3565 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3567 iscsit_build_reject(cmd, conn, hdr);
3569 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3570 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3572 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3577 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3581 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3582 * within iscsit_start_kthreads()
3584 * Here we use bitmap_id to determine which CPU that this
3585 * iSCSI connection's RX/TX threads will be scheduled to
3588 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3589 for_each_online_cpu(cpu) {
3591 cpumask_set_cpu(cpu, conn->conn_cpumask);
3596 * This should never be reached..
3599 cpumask_setall(conn->conn_cpumask);
3603 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3608 case ISTATE_SEND_R2T:
3609 ret = iscsit_send_r2t(cmd, conn);
3614 spin_lock_bh(&conn->cmd_lock);
3615 list_del_init(&cmd->i_conn_node);
3616 spin_unlock_bh(&conn->cmd_lock);
3618 iscsit_free_cmd(cmd, false);
3620 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3621 iscsit_mod_nopin_response_timer(conn);
3622 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3626 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3627 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3632 pr_err("Unknown Opcode: 0x%02x ITT:"
3633 " 0x%08x, i_state: %d on CID: %hu\n",
3634 cmd->iscsi_opcode, cmd->init_task_tag, state,
3644 EXPORT_SYMBOL(iscsit_immediate_queue);
3647 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3649 struct iscsit_transport *t = conn->conn_transport;
3650 struct iscsi_queue_req *qr;
3651 struct iscsi_cmd *cmd;
3655 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3656 atomic_set(&conn->check_immediate_queue, 0);
3659 kmem_cache_free(lio_qr_cache, qr);
3661 ret = t->iscsit_immediate_queue(conn, cmd, state);
3670 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3676 case ISTATE_SEND_DATAIN:
3677 ret = iscsit_send_datain(cmd, conn);
3682 goto check_rsp_state;
3683 else if (ret == 1) {
3685 spin_lock_bh(&cmd->istate_lock);
3686 cmd->i_state = ISTATE_SENT_STATUS;
3687 spin_unlock_bh(&cmd->istate_lock);
3689 if (atomic_read(&conn->check_immediate_queue))
3693 } else if (ret == 2) {
3694 /* Still must send status,
3695 SCF_TRANSPORT_TASK_SENSE was set */
3696 spin_lock_bh(&cmd->istate_lock);
3697 cmd->i_state = ISTATE_SEND_STATUS;
3698 spin_unlock_bh(&cmd->istate_lock);
3699 state = ISTATE_SEND_STATUS;
3700 goto check_rsp_state;
3704 case ISTATE_SEND_STATUS:
3705 case ISTATE_SEND_STATUS_RECOVERY:
3706 ret = iscsit_send_response(cmd, conn);
3708 case ISTATE_SEND_LOGOUTRSP:
3709 ret = iscsit_send_logout(cmd, conn);
3711 case ISTATE_SEND_ASYNCMSG:
3712 ret = iscsit_send_conn_drop_async_message(
3715 case ISTATE_SEND_NOPIN:
3716 ret = iscsit_send_nopin(cmd, conn);
3718 case ISTATE_SEND_REJECT:
3719 ret = iscsit_send_reject(cmd, conn);
3721 case ISTATE_SEND_TASKMGTRSP:
3722 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3725 ret = iscsit_tmr_post_handler(cmd, conn);
3727 iscsit_fall_back_to_erl0(conn->sess);
3729 case ISTATE_SEND_TEXTRSP:
3730 ret = iscsit_send_text_rsp(cmd, conn);
3733 pr_err("Unknown Opcode: 0x%02x ITT:"
3734 " 0x%08x, i_state: %d on CID: %hu\n",
3735 cmd->iscsi_opcode, cmd->init_task_tag,
3743 case ISTATE_SEND_LOGOUTRSP:
3744 if (!iscsit_logout_post_handler(cmd, conn))
3747 case ISTATE_SEND_STATUS:
3748 case ISTATE_SEND_ASYNCMSG:
3749 case ISTATE_SEND_NOPIN:
3750 case ISTATE_SEND_STATUS_RECOVERY:
3751 case ISTATE_SEND_TEXTRSP:
3752 case ISTATE_SEND_TASKMGTRSP:
3753 case ISTATE_SEND_REJECT:
3754 spin_lock_bh(&cmd->istate_lock);
3755 cmd->i_state = ISTATE_SENT_STATUS;
3756 spin_unlock_bh(&cmd->istate_lock);
3759 pr_err("Unknown Opcode: 0x%02x ITT:"
3760 " 0x%08x, i_state: %d on CID: %hu\n",
3761 cmd->iscsi_opcode, cmd->init_task_tag,
3762 cmd->i_state, conn->cid);
3766 if (atomic_read(&conn->check_immediate_queue))
3774 EXPORT_SYMBOL(iscsit_response_queue);
3776 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3778 struct iscsit_transport *t = conn->conn_transport;
3779 struct iscsi_queue_req *qr;
3780 struct iscsi_cmd *cmd;
3784 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3787 kmem_cache_free(lio_qr_cache, qr);
3789 ret = t->iscsit_response_queue(conn, cmd, state);
3790 if (ret == 1 || ret < 0)
3797 int iscsi_target_tx_thread(void *arg)
3800 struct iscsi_conn *conn = arg;
3802 * Allow ourselves to be interrupted by SIGINT so that a
3803 * connection recovery / failure event can be triggered externally.
3805 allow_signal(SIGINT);
3807 while (!kthread_should_stop()) {
3809 * Ensure that both TX and RX per connection kthreads
3810 * are scheduled to run on the same CPU.
3812 iscsit_thread_check_cpumask(conn, current, 1);
3814 wait_event_interruptible(conn->queues_wq,
3815 !iscsit_conn_all_queues_empty(conn));
3817 if (signal_pending(current))
3821 ret = iscsit_handle_immediate_queue(conn);
3825 ret = iscsit_handle_response_queue(conn);
3828 else if (ret == -ECONNRESET)
3836 * Avoid the normal connection failure code-path if this connection
3837 * is still within LOGIN mode, and iscsi_np process context is
3838 * responsible for cleaning up the early connection failure.
3840 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3841 iscsit_take_action_for_connection_exit(conn);
3846 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3848 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3849 struct iscsi_cmd *cmd;
3852 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3853 case ISCSI_OP_SCSI_CMD:
3854 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3858 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3860 case ISCSI_OP_SCSI_DATA_OUT:
3861 ret = iscsit_handle_data_out(conn, buf);
3863 case ISCSI_OP_NOOP_OUT:
3865 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3866 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870 ret = iscsit_handle_nop_out(conn, cmd, buf);
3872 case ISCSI_OP_SCSI_TMFUNC:
3873 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3877 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3880 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3881 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3885 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3890 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3892 case ISCSI_OP_LOGOUT:
3893 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3897 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3899 wait_for_completion_timeout(&conn->conn_logout_comp,
3900 SECONDS_FOR_LOGOUT_COMP * HZ);
3902 case ISCSI_OP_SNACK:
3903 ret = iscsit_handle_snack(conn, buf);
3906 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3907 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3908 pr_err("Cannot recover from unknown"
3909 " opcode while ERL=0, closing iSCSI connection.\n");
3912 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3913 " closing iSCSI connection.\n");
3920 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3923 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3927 spin_lock_bh(&conn->state_lock);
3928 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3929 spin_unlock_bh(&conn->state_lock);
3934 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3937 u8 buffer[ISCSI_HDR_LEN], opcode;
3938 u32 checksum = 0, digest = 0;
3941 while (!kthread_should_stop()) {
3943 * Ensure that both TX and RX per connection kthreads
3944 * are scheduled to run on the same CPU.
3946 iscsit_thread_check_cpumask(conn, current, 0);
3948 memset(buffer, 0, ISCSI_HDR_LEN);
3949 memset(&iov, 0, sizeof(struct kvec));
3951 iov.iov_base = buffer;
3952 iov.iov_len = ISCSI_HDR_LEN;
3954 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3955 if (ret != ISCSI_HDR_LEN) {
3956 iscsit_rx_thread_wait_for_tcp(conn);
3960 if (conn->conn_ops->HeaderDigest) {
3961 iov.iov_base = &digest;
3962 iov.iov_len = ISCSI_CRC_LEN;
3964 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3965 if (ret != ISCSI_CRC_LEN) {
3966 iscsit_rx_thread_wait_for_tcp(conn);
3970 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3971 buffer, ISCSI_HDR_LEN,
3972 0, NULL, (u8 *)&checksum);
3974 if (digest != checksum) {
3975 pr_err("HeaderDigest CRC32C failed,"
3976 " received 0x%08x, computed 0x%08x\n",
3979 * Set the PDU to 0xff so it will intentionally
3980 * hit default in the switch below.
3982 memset(buffer, 0xff, ISCSI_HDR_LEN);
3983 atomic_long_inc(&conn->sess->conn_digest_errors);
3985 pr_debug("Got HeaderDigest CRC32C"
3986 " 0x%08x\n", checksum);
3990 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3993 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3995 if (conn->sess->sess_ops->SessionType &&
3996 ((!(opcode & ISCSI_OP_TEXT)) ||
3997 (!(opcode & ISCSI_OP_LOGOUT)))) {
3998 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3999 " while in Discovery Session, rejecting.\n", opcode);
4000 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4005 ret = iscsi_target_rx_opcode(conn, buffer);
4011 int iscsi_target_rx_thread(void *arg)
4014 struct iscsi_conn *conn = arg;
4017 * Allow ourselves to be interrupted by SIGINT so that a
4018 * connection recovery / failure event can be triggered externally.
4020 allow_signal(SIGINT);
4022 * Wait for iscsi_post_login_handler() to complete before allowing
4023 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4025 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4026 if (rc < 0 || iscsi_target_check_conn_state(conn))
4029 if (!conn->conn_transport->iscsit_get_rx_pdu)
4032 conn->conn_transport->iscsit_get_rx_pdu(conn);
4034 if (!signal_pending(current))
4035 atomic_set(&conn->transport_failed, 1);
4036 iscsit_take_action_for_connection_exit(conn);
4040 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4042 LIST_HEAD(tmp_list);
4043 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4044 struct iscsi_session *sess = conn->sess;
4046 * We expect this function to only ever be called from either RX or TX
4047 * thread context via iscsit_close_connection() once the other context
4048 * has been reset -> returned sleeping pre-handler state.
4050 spin_lock_bh(&conn->cmd_lock);
4051 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4053 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4054 struct se_cmd *se_cmd = &cmd->se_cmd;
4056 if (se_cmd->se_tfo != NULL) {
4057 spin_lock(&se_cmd->t_state_lock);
4058 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4059 spin_unlock(&se_cmd->t_state_lock);
4062 spin_unlock_bh(&conn->cmd_lock);
4064 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4065 list_del_init(&cmd->i_conn_node);
4067 iscsit_increment_maxcmdsn(cmd, sess);
4068 iscsit_free_cmd(cmd, true);
4073 static void iscsit_stop_timers_for_cmds(
4074 struct iscsi_conn *conn)
4076 struct iscsi_cmd *cmd;
4078 spin_lock_bh(&conn->cmd_lock);
4079 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4080 if (cmd->data_direction == DMA_TO_DEVICE)
4081 iscsit_stop_dataout_timer(cmd);
4083 spin_unlock_bh(&conn->cmd_lock);
4086 int iscsit_close_connection(
4087 struct iscsi_conn *conn)
4089 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4090 struct iscsi_session *sess = conn->sess;
4092 pr_debug("Closing iSCSI connection CID %hu on SID:"
4093 " %u\n", conn->cid, sess->sid);
4095 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4096 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4097 * sleeping and the logout response never got sent because the
4098 * connection failed.
4100 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4101 * to signal logout response TX interrupt completion. Go ahead and skip
4102 * this for iser since isert_rx_opcode() does not wait on logout failure,
4103 * and to avoid iscsi_conn pointer dereference in iser-target code.
4105 if (!conn->conn_transport->rdma_shutdown)
4106 complete(&conn->conn_logout_comp);
4108 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4109 if (conn->tx_thread &&
4110 cmpxchg(&conn->tx_thread_active, true, false)) {
4111 send_sig(SIGINT, conn->tx_thread, 1);
4112 kthread_stop(conn->tx_thread);
4114 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4115 if (conn->rx_thread &&
4116 cmpxchg(&conn->rx_thread_active, true, false)) {
4117 send_sig(SIGINT, conn->rx_thread, 1);
4118 kthread_stop(conn->rx_thread);
4122 spin_lock(&iscsit_global->ts_bitmap_lock);
4123 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4125 spin_unlock(&iscsit_global->ts_bitmap_lock);
4127 iscsit_stop_timers_for_cmds(conn);
4128 iscsit_stop_nopin_response_timer(conn);
4129 iscsit_stop_nopin_timer(conn);
4131 if (conn->conn_transport->iscsit_wait_conn)
4132 conn->conn_transport->iscsit_wait_conn(conn);
4135 * During Connection recovery drop unacknowledged out of order
4136 * commands for this connection, and prepare the other commands
4139 * During normal operation clear the out of order commands (but
4140 * do not free the struct iscsi_ooo_cmdsn's) and release all
4141 * struct iscsi_cmds.
4143 if (atomic_read(&conn->connection_recovery)) {
4144 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4145 iscsit_prepare_cmds_for_realligance(conn);
4147 iscsit_clear_ooo_cmdsns_for_conn(conn);
4148 iscsit_release_commands_from_conn(conn);
4150 iscsit_free_queue_reqs_for_conn(conn);
4153 * Handle decrementing session or connection usage count if
4154 * a logout response was not able to be sent because the
4155 * connection failed. Fall back to Session Recovery here.
4157 if (atomic_read(&conn->conn_logout_remove)) {
4158 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4159 iscsit_dec_conn_usage_count(conn);
4160 iscsit_dec_session_usage_count(sess);
4162 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4163 iscsit_dec_conn_usage_count(conn);
4165 atomic_set(&conn->conn_logout_remove, 0);
4166 atomic_set(&sess->session_reinstatement, 0);
4167 atomic_set(&sess->session_fall_back_to_erl0, 1);
4170 spin_lock_bh(&sess->conn_lock);
4171 list_del(&conn->conn_list);
4174 * Attempt to let the Initiator know this connection failed by
4175 * sending an Connection Dropped Async Message on another
4176 * active connection.
4178 if (atomic_read(&conn->connection_recovery))
4179 iscsit_build_conn_drop_async_message(conn);
4181 spin_unlock_bh(&sess->conn_lock);
4184 * If connection reinstatement is being performed on this connection,
4185 * up the connection reinstatement semaphore that is being blocked on
4186 * in iscsit_cause_connection_reinstatement().
4188 spin_lock_bh(&conn->state_lock);
4189 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4190 spin_unlock_bh(&conn->state_lock);
4191 complete(&conn->conn_wait_comp);
4192 wait_for_completion(&conn->conn_post_wait_comp);
4193 spin_lock_bh(&conn->state_lock);
4197 * If connection reinstatement is being performed on this connection
4198 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4199 * connection wait rcfr semaphore that is being blocked on
4200 * an iscsit_connection_reinstatement_rcfr().
4202 if (atomic_read(&conn->connection_wait_rcfr)) {
4203 spin_unlock_bh(&conn->state_lock);
4204 complete(&conn->conn_wait_rcfr_comp);
4205 wait_for_completion(&conn->conn_post_wait_comp);
4206 spin_lock_bh(&conn->state_lock);
4208 atomic_set(&conn->connection_reinstatement, 1);
4209 spin_unlock_bh(&conn->state_lock);
4212 * If any other processes are accessing this connection pointer we
4213 * must wait until they have completed.
4215 iscsit_check_conn_usage_count(conn);
4217 ahash_request_free(conn->conn_tx_hash);
4218 if (conn->conn_rx_hash) {
4219 struct crypto_ahash *tfm;
4221 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4222 ahash_request_free(conn->conn_rx_hash);
4223 crypto_free_ahash(tfm);
4226 free_cpumask_var(conn->conn_cpumask);
4228 kfree(conn->conn_ops);
4229 conn->conn_ops = NULL;
4232 sock_release(conn->sock);
4234 if (conn->conn_transport->iscsit_free_conn)
4235 conn->conn_transport->iscsit_free_conn(conn);
4237 iscsit_put_transport(conn->conn_transport);
4239 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4240 conn->conn_state = TARG_CONN_STATE_FREE;
4243 spin_lock_bh(&sess->conn_lock);
4244 atomic_dec(&sess->nconn);
4245 pr_debug("Decremented iSCSI connection count to %hu from node:"
4246 " %s\n", atomic_read(&sess->nconn),
4247 sess->sess_ops->InitiatorName);
4249 * Make sure that if one connection fails in an non ERL=2 iSCSI
4250 * Session that they all fail.
4252 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4253 !atomic_read(&sess->session_logout))
4254 atomic_set(&sess->session_fall_back_to_erl0, 1);
4257 * If this was not the last connection in the session, and we are
4258 * performing session reinstatement or falling back to ERL=0, call
4259 * iscsit_stop_session() without sleeping to shutdown the other
4260 * active connections.
4262 if (atomic_read(&sess->nconn)) {
4263 if (!atomic_read(&sess->session_reinstatement) &&
4264 !atomic_read(&sess->session_fall_back_to_erl0)) {
4265 spin_unlock_bh(&sess->conn_lock);
4268 if (!atomic_read(&sess->session_stop_active)) {
4269 atomic_set(&sess->session_stop_active, 1);
4270 spin_unlock_bh(&sess->conn_lock);
4271 iscsit_stop_session(sess, 0, 0);
4274 spin_unlock_bh(&sess->conn_lock);
4279 * If this was the last connection in the session and one of the
4280 * following is occurring:
4282 * Session Reinstatement is not being performed, and are falling back
4283 * to ERL=0 call iscsit_close_session().
4285 * Session Logout was requested. iscsit_close_session() will be called
4288 * Session Continuation is not being performed, start the Time2Retain
4289 * handler and check if sleep_on_sess_wait_sem is active.
4291 if (!atomic_read(&sess->session_reinstatement) &&
4292 atomic_read(&sess->session_fall_back_to_erl0)) {
4293 spin_unlock_bh(&sess->conn_lock);
4294 iscsit_close_session(sess);
4297 } else if (atomic_read(&sess->session_logout)) {
4298 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4299 sess->session_state = TARG_SESS_STATE_FREE;
4300 spin_unlock_bh(&sess->conn_lock);
4302 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4303 complete(&sess->session_wait_comp);
4307 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4308 sess->session_state = TARG_SESS_STATE_FAILED;
4310 if (!atomic_read(&sess->session_continuation)) {
4311 spin_unlock_bh(&sess->conn_lock);
4312 iscsit_start_time2retain_handler(sess);
4314 spin_unlock_bh(&sess->conn_lock);
4316 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4317 complete(&sess->session_wait_comp);
4324 * If the iSCSI Session for the iSCSI Initiator Node exists,
4325 * forcefully shutdown the iSCSI NEXUS.
4327 int iscsit_close_session(struct iscsi_session *sess)
4329 struct iscsi_portal_group *tpg = sess->tpg;
4330 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4332 if (atomic_read(&sess->nconn)) {
4333 pr_err("%d connection(s) still exist for iSCSI session"
4334 " to %s\n", atomic_read(&sess->nconn),
4335 sess->sess_ops->InitiatorName);
4339 spin_lock_bh(&se_tpg->session_lock);
4340 atomic_set(&sess->session_logout, 1);
4341 atomic_set(&sess->session_reinstatement, 1);
4342 iscsit_stop_time2retain_timer(sess);
4343 spin_unlock_bh(&se_tpg->session_lock);
4346 * transport_deregister_session_configfs() will clear the
4347 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4348 * can be setting it again with __transport_register_session() in
4349 * iscsi_post_login_handler() again after the iscsit_stop_session()
4350 * completes in iscsi_np context.
4352 transport_deregister_session_configfs(sess->se_sess);
4355 * If any other processes are accessing this session pointer we must
4356 * wait until they have completed. If we are in an interrupt (the
4357 * time2retain handler) and contain and active session usage count we
4358 * restart the timer and exit.
4360 if (!in_interrupt()) {
4361 if (iscsit_check_session_usage_count(sess) == 1)
4362 iscsit_stop_session(sess, 1, 1);
4364 if (iscsit_check_session_usage_count(sess) == 2) {
4365 atomic_set(&sess->session_logout, 0);
4366 iscsit_start_time2retain_handler(sess);
4371 transport_deregister_session(sess->se_sess);
4373 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4374 iscsit_free_connection_recovery_entires(sess);
4376 iscsit_free_all_ooo_cmdsns(sess);
4378 spin_lock_bh(&se_tpg->session_lock);
4379 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4380 sess->session_state = TARG_SESS_STATE_FREE;
4381 pr_debug("Released iSCSI session from node: %s\n",
4382 sess->sess_ops->InitiatorName);
4385 tpg->tpg_tiqn->tiqn_nsessions--;
4387 pr_debug("Decremented number of active iSCSI Sessions on"
4388 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4390 spin_lock(&sess_idr_lock);
4391 idr_remove(&sess_idr, sess->session_index);
4392 spin_unlock(&sess_idr_lock);
4394 kfree(sess->sess_ops);
4395 sess->sess_ops = NULL;
4396 spin_unlock_bh(&se_tpg->session_lock);
4402 static void iscsit_logout_post_handler_closesession(
4403 struct iscsi_conn *conn)
4405 struct iscsi_session *sess = conn->sess;
4408 * Traditional iscsi/tcp will invoke this logic from TX thread
4409 * context during session logout, so clear tx_thread_active and
4410 * sleep if iscsit_close_connection() has not already occured.
4412 * Since iser-target invokes this logic from it's own workqueue,
4413 * always sleep waiting for RX/TX thread shutdown to complete
4414 * within iscsit_close_connection().
4416 if (!conn->conn_transport->rdma_shutdown)
4417 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4419 atomic_set(&conn->conn_logout_remove, 0);
4420 complete(&conn->conn_logout_comp);
4422 iscsit_dec_conn_usage_count(conn);
4423 iscsit_stop_session(sess, sleep, sleep);
4424 iscsit_dec_session_usage_count(sess);
4425 iscsit_close_session(sess);
4428 static void iscsit_logout_post_handler_samecid(
4429 struct iscsi_conn *conn)
4433 if (!conn->conn_transport->rdma_shutdown)
4434 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4436 atomic_set(&conn->conn_logout_remove, 0);
4437 complete(&conn->conn_logout_comp);
4439 iscsit_cause_connection_reinstatement(conn, sleep);
4440 iscsit_dec_conn_usage_count(conn);
4443 static void iscsit_logout_post_handler_diffcid(
4444 struct iscsi_conn *conn,
4447 struct iscsi_conn *l_conn;
4448 struct iscsi_session *sess = conn->sess;
4449 bool conn_found = false;
4454 spin_lock_bh(&sess->conn_lock);
4455 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4456 if (l_conn->cid == cid) {
4457 iscsit_inc_conn_usage_count(l_conn);
4462 spin_unlock_bh(&sess->conn_lock);
4468 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4470 spin_lock_bh(&l_conn->state_lock);
4471 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4472 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4473 spin_unlock_bh(&l_conn->state_lock);
4475 iscsit_cause_connection_reinstatement(l_conn, 1);
4476 iscsit_dec_conn_usage_count(l_conn);
4480 * Return of 0 causes the TX thread to restart.
4482 int iscsit_logout_post_handler(
4483 struct iscsi_cmd *cmd,
4484 struct iscsi_conn *conn)
4488 switch (cmd->logout_reason) {
4489 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4490 switch (cmd->logout_response) {
4491 case ISCSI_LOGOUT_SUCCESS:
4492 case ISCSI_LOGOUT_CLEANUP_FAILED:
4494 iscsit_logout_post_handler_closesession(conn);
4499 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4500 if (conn->cid == cmd->logout_cid) {
4501 switch (cmd->logout_response) {
4502 case ISCSI_LOGOUT_SUCCESS:
4503 case ISCSI_LOGOUT_CLEANUP_FAILED:
4505 iscsit_logout_post_handler_samecid(conn);
4510 switch (cmd->logout_response) {
4511 case ISCSI_LOGOUT_SUCCESS:
4512 iscsit_logout_post_handler_diffcid(conn,
4515 case ISCSI_LOGOUT_CID_NOT_FOUND:
4516 case ISCSI_LOGOUT_CLEANUP_FAILED:
4523 case ISCSI_LOGOUT_REASON_RECOVERY:
4524 switch (cmd->logout_response) {
4525 case ISCSI_LOGOUT_SUCCESS:
4526 case ISCSI_LOGOUT_CID_NOT_FOUND:
4527 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4528 case ISCSI_LOGOUT_CLEANUP_FAILED:
4540 EXPORT_SYMBOL(iscsit_logout_post_handler);
4542 void iscsit_fail_session(struct iscsi_session *sess)
4544 struct iscsi_conn *conn;
4546 spin_lock_bh(&sess->conn_lock);
4547 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4548 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4549 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4551 spin_unlock_bh(&sess->conn_lock);
4553 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4554 sess->session_state = TARG_SESS_STATE_FAILED;
4557 int iscsit_free_session(struct iscsi_session *sess)
4559 u16 conn_count = atomic_read(&sess->nconn);
4560 struct iscsi_conn *conn, *conn_tmp = NULL;
4563 spin_lock_bh(&sess->conn_lock);
4564 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4566 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4568 if (conn_count == 0)
4571 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4574 iscsit_inc_conn_usage_count(conn_tmp);
4577 iscsit_inc_conn_usage_count(conn);
4579 spin_unlock_bh(&sess->conn_lock);
4580 iscsit_cause_connection_reinstatement(conn, 1);
4581 spin_lock_bh(&sess->conn_lock);
4583 iscsit_dec_conn_usage_count(conn);
4585 iscsit_dec_conn_usage_count(conn_tmp);
4590 if (atomic_read(&sess->nconn)) {
4591 spin_unlock_bh(&sess->conn_lock);
4592 wait_for_completion(&sess->session_wait_comp);
4594 spin_unlock_bh(&sess->conn_lock);
4596 iscsit_close_session(sess);
4600 void iscsit_stop_session(
4601 struct iscsi_session *sess,
4603 int connection_sleep)
4605 u16 conn_count = atomic_read(&sess->nconn);
4606 struct iscsi_conn *conn, *conn_tmp = NULL;
4609 spin_lock_bh(&sess->conn_lock);
4611 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4613 if (connection_sleep) {
4614 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4616 if (conn_count == 0)
4619 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4622 iscsit_inc_conn_usage_count(conn_tmp);
4625 iscsit_inc_conn_usage_count(conn);
4627 spin_unlock_bh(&sess->conn_lock);
4628 iscsit_cause_connection_reinstatement(conn, 1);
4629 spin_lock_bh(&sess->conn_lock);
4631 iscsit_dec_conn_usage_count(conn);
4633 iscsit_dec_conn_usage_count(conn_tmp);
4637 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4638 iscsit_cause_connection_reinstatement(conn, 0);
4641 if (session_sleep && atomic_read(&sess->nconn)) {
4642 spin_unlock_bh(&sess->conn_lock);
4643 wait_for_completion(&sess->session_wait_comp);
4645 spin_unlock_bh(&sess->conn_lock);
4648 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4650 struct iscsi_session *sess;
4651 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4652 struct se_session *se_sess, *se_sess_tmp;
4653 LIST_HEAD(free_list);
4654 int session_count = 0;
4656 spin_lock_bh(&se_tpg->session_lock);
4657 if (tpg->nsessions && !force) {
4658 spin_unlock_bh(&se_tpg->session_lock);
4662 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4664 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4666 spin_lock(&sess->conn_lock);
4667 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4668 atomic_read(&sess->session_logout) ||
4669 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4670 spin_unlock(&sess->conn_lock);
4673 atomic_set(&sess->session_reinstatement, 1);
4674 spin_unlock(&sess->conn_lock);
4676 list_move_tail(&se_sess->sess_list, &free_list);
4678 spin_unlock_bh(&se_tpg->session_lock);
4680 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4681 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4683 iscsit_free_session(sess);
4687 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4688 " Group: %hu\n", session_count, tpg->tpgt);
4692 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4693 MODULE_VERSION("4.1.x");
4694 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4695 MODULE_LICENSE("GPL");
4697 module_init(iscsi_target_init_module);
4698 module_exit(iscsi_target_cleanup_module);