1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
51 #include <target/iscsi/iscsi_transport.h>
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
58 static struct idr tiqn_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_lock;
63 struct iscsit_global *iscsit_global;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75 struct iscsi_tiqn *tiqn = NULL;
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
88 spin_unlock(&tiqn->tiqn_state_lock);
91 spin_unlock(&tiqn_lock);
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
104 spin_unlock(&tiqn->tiqn_state_lock);
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122 struct iscsi_tiqn *tiqn = NULL;
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
128 return ERR_PTR(-EINVAL);
131 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
133 pr_err("Unable to allocate struct iscsi_tiqn\n");
134 return ERR_PTR(-ENOMEM);
137 sprintf(tiqn->tiqn, "%s", buf);
138 INIT_LIST_HEAD(&tiqn->tiqn_list);
139 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
140 spin_lock_init(&tiqn->tiqn_state_lock);
141 spin_lock_init(&tiqn->tiqn_tpg_lock);
142 spin_lock_init(&tiqn->sess_err_stats.lock);
143 spin_lock_init(&tiqn->login_stats.lock);
144 spin_lock_init(&tiqn->logout_stats.lock);
146 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
148 idr_preload(GFP_KERNEL);
149 spin_lock(&tiqn_lock);
151 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
153 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
154 spin_unlock(&tiqn_lock);
159 tiqn->tiqn_index = ret;
160 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
162 spin_unlock(&tiqn_lock);
165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
174 * Wait for accesses to said struct iscsi_tiqn to end.
176 spin_lock(&tiqn->tiqn_state_lock);
177 while (tiqn->tiqn_access_count != 0) {
178 spin_unlock(&tiqn->tiqn_state_lock);
180 spin_lock(&tiqn->tiqn_state_lock);
182 spin_unlock(&tiqn->tiqn_state_lock);
185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
189 * while holding tiqn->tiqn_state_lock. This means that all subsequent
190 * attempts to access this struct iscsi_tiqn will fail from both transport
191 * fabric and control code paths.
193 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
194 pr_err("iscsit_set_tiqn_shutdown() failed\n");
198 iscsit_wait_for_tiqn(tiqn);
200 spin_lock(&tiqn_lock);
201 list_del(&tiqn->tiqn_list);
202 idr_remove(&tiqn_idr, tiqn->tiqn_index);
203 spin_unlock(&tiqn_lock);
205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
214 * Determine if the network portal is accepting storage traffic.
216 spin_lock_bh(&np->np_thread_lock);
217 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
218 spin_unlock_bh(&np->np_thread_lock);
221 spin_unlock_bh(&np->np_thread_lock);
223 * Determine if the portal group is accepting storage traffic.
225 spin_lock_bh(&tpg->tpg_state_lock);
226 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
227 spin_unlock_bh(&tpg->tpg_state_lock);
230 spin_unlock_bh(&tpg->tpg_state_lock);
233 * Here we serialize access across the TIQN+TPG Tuple.
235 ret = down_interruptible(&tpg->np_login_sem);
239 spin_lock_bh(&tpg->tpg_state_lock);
240 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
241 spin_unlock_bh(&tpg->tpg_state_lock);
242 up(&tpg->np_login_sem);
245 spin_unlock_bh(&tpg->tpg_state_lock);
250 void iscsit_login_kref_put(struct kref *kref)
252 struct iscsi_tpg_np *tpg_np = container_of(kref,
253 struct iscsi_tpg_np, tpg_np_kref);
255 complete(&tpg_np->tpg_np_comp);
258 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
259 struct iscsi_tpg_np *tpg_np)
261 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
263 up(&tpg->np_login_sem);
266 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
269 iscsit_put_tiqn_for_login(tiqn);
274 bool iscsit_check_np_match(
275 struct sockaddr_storage *sockaddr,
277 int network_transport)
279 struct sockaddr_in *sock_in, *sock_in_e;
280 struct sockaddr_in6 *sock_in6, *sock_in6_e;
281 bool ip_match = false;
284 if (sockaddr->ss_family == AF_INET6) {
285 sock_in6 = (struct sockaddr_in6 *)sockaddr;
286 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
288 if (!memcmp(&sock_in6->sin6_addr.in6_u,
289 &sock_in6_e->sin6_addr.in6_u,
290 sizeof(struct in6_addr)))
293 port = ntohs(sock_in6->sin6_port);
294 port_e = ntohs(sock_in6_e->sin6_port);
296 sock_in = (struct sockaddr_in *)sockaddr;
297 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
299 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
302 port = ntohs(sock_in->sin_port);
303 port_e = ntohs(sock_in_e->sin_port);
306 if (ip_match && (port_e == port) &&
307 (np->np_network_transport == network_transport))
314 * Called with mutex np_lock held
316 static struct iscsi_np *iscsit_get_np(
317 struct sockaddr_storage *sockaddr,
318 int network_transport)
323 list_for_each_entry(np, &g_np_list, np_list) {
324 spin_lock_bh(&np->np_thread_lock);
325 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
326 spin_unlock_bh(&np->np_thread_lock);
330 match = iscsit_check_np_match(sockaddr, np, network_transport);
333 * Increment the np_exports reference count now to
334 * prevent iscsit_del_np() below from being called
335 * while iscsi_tpg_add_network_portal() is called.
338 spin_unlock_bh(&np->np_thread_lock);
341 spin_unlock_bh(&np->np_thread_lock);
347 struct iscsi_np *iscsit_add_np(
348 struct sockaddr_storage *sockaddr,
349 int network_transport)
354 mutex_lock(&np_lock);
357 * Locate the existing struct iscsi_np if already active..
359 np = iscsit_get_np(sockaddr, network_transport);
361 mutex_unlock(&np_lock);
365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
367 pr_err("Unable to allocate memory for struct iscsi_np\n");
368 mutex_unlock(&np_lock);
369 return ERR_PTR(-ENOMEM);
372 np->np_flags |= NPF_IP_NETWORK;
373 np->np_network_transport = network_transport;
374 spin_lock_init(&np->np_thread_lock);
375 init_completion(&np->np_restart_comp);
376 INIT_LIST_HEAD(&np->np_list);
378 ret = iscsi_target_setup_login_socket(np, sockaddr);
381 mutex_unlock(&np_lock);
385 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
386 if (IS_ERR(np->np_thread)) {
387 pr_err("Unable to create kthread: iscsi_np\n");
388 ret = PTR_ERR(np->np_thread);
390 mutex_unlock(&np_lock);
394 * Increment the np_exports reference count now to prevent
395 * iscsit_del_np() below from being run while a new call to
396 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
397 * active. We don't need to hold np->np_thread_lock at this
398 * point because iscsi_np has not been added to g_np_list yet.
401 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
403 list_add_tail(&np->np_list, &g_np_list);
404 mutex_unlock(&np_lock);
406 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
407 &np->np_sockaddr, np->np_transport->name);
412 int iscsit_reset_np_thread(
414 struct iscsi_tpg_np *tpg_np,
415 struct iscsi_portal_group *tpg,
418 spin_lock_bh(&np->np_thread_lock);
419 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
420 spin_unlock_bh(&np->np_thread_lock);
423 np->np_thread_state = ISCSI_NP_THREAD_RESET;
426 spin_unlock_bh(&np->np_thread_lock);
427 send_sig(SIGINT, np->np_thread, 1);
428 wait_for_completion(&np->np_restart_comp);
429 spin_lock_bh(&np->np_thread_lock);
431 spin_unlock_bh(&np->np_thread_lock);
433 if (tpg_np && shutdown) {
434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
436 wait_for_completion(&tpg_np->tpg_np_comp);
442 static void iscsit_free_np(struct iscsi_np *np)
445 sock_release(np->np_socket);
448 int iscsit_del_np(struct iscsi_np *np)
450 spin_lock_bh(&np->np_thread_lock);
452 if (np->np_exports) {
454 spin_unlock_bh(&np->np_thread_lock);
457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
458 spin_unlock_bh(&np->np_thread_lock);
462 * We need to send the signal to wakeup Linux/Net
463 * which may be sleeping in sock_accept()..
465 send_sig(SIGINT, np->np_thread, 1);
466 kthread_stop(np->np_thread);
467 np->np_thread = NULL;
470 np->np_transport->iscsit_free_np(np);
472 mutex_lock(&np_lock);
473 list_del(&np->np_list);
474 mutex_unlock(&np_lock);
476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
477 &np->np_sockaddr, np->np_transport->name);
479 iscsit_put_transport(np->np_transport);
484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
488 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
491 EXPORT_SYMBOL(iscsit_queue_rsp);
493 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
495 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
497 spin_lock_bh(&conn->cmd_lock);
498 if (!list_empty(&cmd->i_conn_node) &&
499 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
500 list_del_init(&cmd->i_conn_node);
501 spin_unlock_bh(&conn->cmd_lock);
503 __iscsit_free_cmd(cmd, scsi_cmd, true);
505 EXPORT_SYMBOL(iscsit_aborted_task);
507 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
508 u32, u32, u8 *, u8 *);
509 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
512 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
513 const void *data_buf, u32 data_buf_len)
515 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
517 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
520 iov = &cmd->iov_misc[0];
521 iov[niov].iov_base = cmd->pdu;
522 iov[niov++].iov_len = ISCSI_HDR_LEN;
524 if (conn->conn_ops->HeaderDigest) {
525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
527 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
528 ISCSI_HDR_LEN, 0, NULL,
529 (u8 *)header_digest);
531 iov[0].iov_len += ISCSI_CRC_LEN;
532 tx_size += ISCSI_CRC_LEN;
533 pr_debug("Attaching CRC32C HeaderDigest"
534 " to opcode 0x%x 0x%08x\n",
535 hdr->opcode, *header_digest);
539 u32 padding = ((-data_buf_len) & 3);
541 iov[niov].iov_base = (void *)data_buf;
542 iov[niov++].iov_len = data_buf_len;
543 tx_size += data_buf_len;
546 iov[niov].iov_base = &cmd->pad_bytes;
547 iov[niov++].iov_len = padding;
549 pr_debug("Attaching %u additional"
550 " padding bytes.\n", padding);
553 if (conn->conn_ops->DataDigest) {
554 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
555 data_buf, data_buf_len,
557 (u8 *)&cmd->pad_bytes,
558 (u8 *)&cmd->data_crc);
560 iov[niov].iov_base = &cmd->data_crc;
561 iov[niov++].iov_len = ISCSI_CRC_LEN;
562 tx_size += ISCSI_CRC_LEN;
563 pr_debug("Attached DataDigest for %u"
564 " bytes opcode 0x%x, CRC 0x%08x\n",
565 data_buf_len, hdr->opcode, cmd->data_crc);
569 cmd->iov_misc_count = niov;
570 cmd->tx_size = tx_size;
572 ret = iscsit_send_tx_data(cmd, conn, 1);
574 iscsit_tx_thread_wait_for_tcp(conn);
581 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
582 static void iscsit_unmap_iovec(struct iscsi_cmd *);
583 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
584 u32, u32, u32, u8 *);
586 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
587 const struct iscsi_datain *datain)
590 u32 iov_count = 0, tx_size = 0;
593 iov = &cmd->iov_data[0];
594 iov[iov_count].iov_base = cmd->pdu;
595 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
596 tx_size += ISCSI_HDR_LEN;
598 if (conn->conn_ops->HeaderDigest) {
599 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
601 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
602 ISCSI_HDR_LEN, 0, NULL,
603 (u8 *)header_digest);
605 iov[0].iov_len += ISCSI_CRC_LEN;
606 tx_size += ISCSI_CRC_LEN;
608 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
612 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
613 datain->offset, datain->length);
617 iov_count += iov_ret;
618 tx_size += datain->length;
620 cmd->padding = ((-datain->length) & 3);
622 iov[iov_count].iov_base = cmd->pad_bytes;
623 iov[iov_count++].iov_len = cmd->padding;
624 tx_size += cmd->padding;
626 pr_debug("Attaching %u padding bytes\n", cmd->padding);
629 if (conn->conn_ops->DataDigest) {
630 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
636 iov[iov_count].iov_base = &cmd->data_crc;
637 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
638 tx_size += ISCSI_CRC_LEN;
640 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
641 datain->length + cmd->padding, cmd->data_crc);
644 cmd->iov_data_count = iov_count;
645 cmd->tx_size = tx_size;
647 ret = iscsit_fe_sendpage_sg(cmd, conn);
649 iscsit_unmap_iovec(cmd);
652 iscsit_tx_thread_wait_for_tcp(conn);
659 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
660 struct iscsi_datain_req *dr, const void *buf,
664 return iscsit_xmit_datain_pdu(conn, cmd, buf);
666 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
669 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
671 return TARGET_PROT_NORMAL;
674 static struct iscsit_transport iscsi_target_transport = {
676 .transport_type = ISCSI_TCP,
677 .rdma_shutdown = false,
679 .iscsit_setup_np = iscsit_setup_np,
680 .iscsit_accept_np = iscsit_accept_np,
681 .iscsit_free_np = iscsit_free_np,
682 .iscsit_get_login_rx = iscsit_get_login_rx,
683 .iscsit_put_login_tx = iscsit_put_login_tx,
684 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
685 .iscsit_immediate_queue = iscsit_immediate_queue,
686 .iscsit_response_queue = iscsit_response_queue,
687 .iscsit_queue_data_in = iscsit_queue_rsp,
688 .iscsit_queue_status = iscsit_queue_rsp,
689 .iscsit_aborted_task = iscsit_aborted_task,
690 .iscsit_xmit_pdu = iscsit_xmit_pdu,
691 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
692 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
695 static int __init iscsi_target_init_module(void)
699 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
701 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
702 if (!iscsit_global) {
703 pr_err("Unable to allocate memory for iscsit_global\n");
706 spin_lock_init(&iscsit_global->ts_bitmap_lock);
707 mutex_init(&auth_id_lock);
708 spin_lock_init(&sess_idr_lock);
712 ret = target_register_template(&iscsi_ops);
716 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
717 iscsit_global->ts_bitmap = vzalloc(size);
718 if (!iscsit_global->ts_bitmap) {
719 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
723 lio_qr_cache = kmem_cache_create("lio_qr_cache",
724 sizeof(struct iscsi_queue_req),
725 __alignof__(struct iscsi_queue_req), 0, NULL);
727 pr_err("nable to kmem_cache_create() for"
732 lio_dr_cache = kmem_cache_create("lio_dr_cache",
733 sizeof(struct iscsi_datain_req),
734 __alignof__(struct iscsi_datain_req), 0, NULL);
736 pr_err("Unable to kmem_cache_create() for"
741 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
742 sizeof(struct iscsi_ooo_cmdsn),
743 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
744 if (!lio_ooo_cache) {
745 pr_err("Unable to kmem_cache_create() for"
750 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
751 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
753 if (!lio_r2t_cache) {
754 pr_err("Unable to kmem_cache_create() for"
759 iscsit_register_transport(&iscsi_target_transport);
761 if (iscsit_load_discovery_tpg() < 0)
766 iscsit_unregister_transport(&iscsi_target_transport);
767 kmem_cache_destroy(lio_r2t_cache);
769 kmem_cache_destroy(lio_ooo_cache);
771 kmem_cache_destroy(lio_dr_cache);
773 kmem_cache_destroy(lio_qr_cache);
775 vfree(iscsit_global->ts_bitmap);
777 /* XXX: this probably wants it to be it's own unwind step.. */
778 if (iscsit_global->discovery_tpg)
779 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
780 target_unregister_template(&iscsi_ops);
782 kfree(iscsit_global);
786 static void __exit iscsi_target_cleanup_module(void)
788 iscsit_release_discovery_tpg();
789 iscsit_unregister_transport(&iscsi_target_transport);
790 kmem_cache_destroy(lio_qr_cache);
791 kmem_cache_destroy(lio_dr_cache);
792 kmem_cache_destroy(lio_ooo_cache);
793 kmem_cache_destroy(lio_r2t_cache);
796 * Shutdown discovery sessions and disable discovery TPG
798 if (iscsit_global->discovery_tpg)
799 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
801 target_unregister_template(&iscsi_ops);
803 vfree(iscsit_global->ts_bitmap);
804 kfree(iscsit_global);
807 int iscsit_add_reject(
808 struct iscsi_conn *conn,
812 struct iscsi_cmd *cmd;
814 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
818 cmd->iscsi_opcode = ISCSI_OP_REJECT;
819 cmd->reject_reason = reason;
821 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
823 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
824 iscsit_free_cmd(cmd, false);
828 spin_lock_bh(&conn->cmd_lock);
829 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
830 spin_unlock_bh(&conn->cmd_lock);
832 cmd->i_state = ISTATE_SEND_REJECT;
833 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
837 EXPORT_SYMBOL(iscsit_add_reject);
839 static int iscsit_add_reject_from_cmd(
840 struct iscsi_cmd *cmd,
845 struct iscsi_conn *conn;
848 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
854 cmd->iscsi_opcode = ISCSI_OP_REJECT;
855 cmd->reject_reason = reason;
857 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
859 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
860 iscsit_free_cmd(cmd, false);
865 spin_lock_bh(&conn->cmd_lock);
866 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
867 spin_unlock_bh(&conn->cmd_lock);
870 cmd->i_state = ISTATE_SEND_REJECT;
871 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
873 * Perform the kref_put now if se_cmd has already been setup by
874 * scsit_setup_scsi_cmd()
876 if (cmd->se_cmd.se_tfo != NULL) {
877 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
878 target_put_sess_cmd(&cmd->se_cmd);
883 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
886 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
889 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
891 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
893 EXPORT_SYMBOL(iscsit_reject_cmd);
896 * Map some portion of the allocated scatterlist to an iovec, suitable for
897 * kernel sockets to copy data in/out.
899 static int iscsit_map_iovec(
900 struct iscsi_cmd *cmd,
906 struct scatterlist *sg;
907 unsigned int page_off;
910 * We know each entry in t_data_sg contains a page.
912 u32 ent = data_offset / PAGE_SIZE;
914 if (ent >= cmd->se_cmd.t_data_nents) {
915 pr_err("Initial page entry out-of-bounds\n");
919 sg = &cmd->se_cmd.t_data_sg[ent];
920 page_off = (data_offset % PAGE_SIZE);
922 cmd->first_data_sg = sg;
923 cmd->first_data_sg_off = page_off;
925 while (data_length) {
926 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
928 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
929 iov[i].iov_len = cur_len;
931 data_length -= cur_len;
937 cmd->kmapped_nents = i;
942 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
945 struct scatterlist *sg;
947 sg = cmd->first_data_sg;
949 for (i = 0; i < cmd->kmapped_nents; i++)
950 kunmap(sg_page(&sg[i]));
953 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
956 struct iscsi_cmd *cmd, *cmd_p;
958 conn->exp_statsn = exp_statsn;
960 if (conn->sess->sess_ops->RDMAExtensions)
963 spin_lock_bh(&conn->cmd_lock);
964 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
965 spin_lock(&cmd->istate_lock);
966 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
967 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
968 cmd->i_state = ISTATE_REMOVE;
969 spin_unlock(&cmd->istate_lock);
970 list_move_tail(&cmd->i_conn_node, &ack_list);
973 spin_unlock(&cmd->istate_lock);
975 spin_unlock_bh(&conn->cmd_lock);
977 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
978 list_del_init(&cmd->i_conn_node);
979 iscsit_free_cmd(cmd, false);
983 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
985 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
987 iov_count += ISCSI_IOV_DATA_BUFFER;
989 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
990 if (!cmd->iov_data) {
991 pr_err("Unable to allocate cmd->iov_data\n");
995 cmd->orig_iov_data_count = iov_count;
999 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1002 int data_direction, payload_length;
1003 struct iscsi_scsi_req *hdr;
1004 int iscsi_task_attr;
1007 atomic_long_inc(&conn->sess->cmd_pdus);
1009 hdr = (struct iscsi_scsi_req *) buf;
1010 payload_length = ntoh24(hdr->dlength);
1012 /* FIXME; Add checks for AdditionalHeaderSegment */
1014 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1015 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1016 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1017 " not set. Bad iSCSI Initiator.\n");
1018 return iscsit_add_reject_cmd(cmd,
1019 ISCSI_REASON_BOOKMARK_INVALID, buf);
1022 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1023 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1025 * From RFC-3720 Section 10.3.1:
1027 * "Either or both of R and W MAY be 1 when either the
1028 * Expected Data Transfer Length and/or Bidirectional Read
1029 * Expected Data Transfer Length are 0"
1031 * For this case, go ahead and clear the unnecssary bits
1032 * to avoid any confusion with ->data_direction.
1034 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1035 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1037 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1038 " set when Expected Data Transfer Length is 0 for"
1039 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1042 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1043 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1044 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1045 " MUST be set if Expected Data Transfer Length is not 0."
1046 " Bad iSCSI Initiator\n");
1047 return iscsit_add_reject_cmd(cmd,
1048 ISCSI_REASON_BOOKMARK_INVALID, buf);
1051 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1052 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1053 pr_err("Bidirectional operations not supported!\n");
1054 return iscsit_add_reject_cmd(cmd,
1055 ISCSI_REASON_BOOKMARK_INVALID, buf);
1058 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1059 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1060 " Scsi Command PDU.\n");
1061 return iscsit_add_reject_cmd(cmd,
1062 ISCSI_REASON_BOOKMARK_INVALID, buf);
1065 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1066 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1067 " protocol error.\n", payload_length);
1068 return iscsit_add_reject_cmd(cmd,
1069 ISCSI_REASON_PROTOCOL_ERROR, buf);
1072 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1073 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1074 pr_err("Expected Data Transfer Length and Length of"
1075 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1076 " bit is not set protocol error\n");
1077 return iscsit_add_reject_cmd(cmd,
1078 ISCSI_REASON_PROTOCOL_ERROR, buf);
1081 if (payload_length > be32_to_cpu(hdr->data_length)) {
1082 pr_err("DataSegmentLength: %u is greater than"
1083 " EDTL: %u, protocol error.\n", payload_length,
1085 return iscsit_add_reject_cmd(cmd,
1086 ISCSI_REASON_PROTOCOL_ERROR, buf);
1089 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1090 pr_err("DataSegmentLength: %u is greater than"
1091 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1092 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1093 return iscsit_add_reject_cmd(cmd,
1094 ISCSI_REASON_PROTOCOL_ERROR, buf);
1097 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1098 pr_err("DataSegmentLength: %u is greater than"
1099 " FirstBurstLength: %u, protocol error.\n",
1100 payload_length, conn->sess->sess_ops->FirstBurstLength);
1101 return iscsit_add_reject_cmd(cmd,
1102 ISCSI_REASON_BOOKMARK_INVALID, buf);
1105 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1106 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1109 cmd->data_direction = data_direction;
1110 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1112 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1114 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1115 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1116 sam_task_attr = TCM_SIMPLE_TAG;
1117 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1118 sam_task_attr = TCM_ORDERED_TAG;
1119 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1120 sam_task_attr = TCM_HEAD_TAG;
1121 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1122 sam_task_attr = TCM_ACA_TAG;
1124 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1125 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1126 sam_task_attr = TCM_SIMPLE_TAG;
1129 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1130 cmd->i_state = ISTATE_NEW_CMD;
1131 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1132 cmd->immediate_data = (payload_length) ? 1 : 0;
1133 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1134 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1135 if (cmd->unsolicited_data)
1136 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1138 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1139 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1140 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1142 cmd->targ_xfer_tag = 0xFFFFFFFF;
1143 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1144 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1145 cmd->first_burst_len = payload_length;
1147 if (!conn->sess->sess_ops->RDMAExtensions &&
1148 cmd->data_direction == DMA_FROM_DEVICE) {
1149 struct iscsi_datain_req *dr;
1151 dr = iscsit_allocate_datain_req();
1153 return iscsit_add_reject_cmd(cmd,
1154 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1156 iscsit_attach_datain_req(cmd, dr);
1160 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1162 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1163 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1164 cmd->data_direction, sam_task_attr,
1165 cmd->sense_buffer + 2);
1167 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1168 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1169 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1172 target_get_sess_cmd(&cmd->se_cmd, true);
1174 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1175 scsilun_to_int(&hdr->lun));
1176 if (cmd->sense_reason)
1179 /* only used for printks or comparing with ->ref_task_tag */
1180 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1181 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1182 if (cmd->sense_reason) {
1183 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1184 return iscsit_add_reject_cmd(cmd,
1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1191 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1192 return iscsit_add_reject_cmd(cmd,
1193 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1197 spin_lock_bh(&conn->cmd_lock);
1198 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1199 spin_unlock_bh(&conn->cmd_lock);
1201 * Check if we need to delay processing because of ALUA
1202 * Active/NonOptimized primary access state..
1204 core_alua_check_nonop_delay(&cmd->se_cmd);
1208 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1210 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1212 iscsit_set_dataout_sequence_values(cmd);
1214 spin_lock_bh(&cmd->dataout_timeout_lock);
1215 iscsit_start_dataout_timer(cmd, cmd->conn);
1216 spin_unlock_bh(&cmd->dataout_timeout_lock);
1218 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1220 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1221 struct iscsi_scsi_req *hdr)
1225 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1226 * the Immediate Bit is not set, and no Immediate
1229 * A PDU/CmdSN carrying Immediate Data can only
1230 * be processed after the DataCRC has passed.
1231 * If the DataCRC fails, the CmdSN MUST NOT
1232 * be acknowledged. (See below)
1234 if (!cmd->immediate_data) {
1235 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1236 (unsigned char *)hdr, hdr->cmdsn);
1237 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1239 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1240 target_put_sess_cmd(&cmd->se_cmd);
1245 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1248 * If no Immediate Data is attached, it's OK to return now.
1250 if (!cmd->immediate_data) {
1251 if (!cmd->sense_reason && cmd->unsolicited_data)
1252 iscsit_set_unsoliticed_dataout(cmd);
1253 if (!cmd->sense_reason)
1256 target_put_sess_cmd(&cmd->se_cmd);
1261 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1262 * execution. These exceptions are processed in CmdSN order using
1263 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1265 if (cmd->sense_reason) {
1266 if (cmd->reject_reason)
1272 * Call directly into transport_generic_new_cmd() to perform
1273 * the backend memory allocation.
1275 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1276 if (cmd->sense_reason)
1281 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1284 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1287 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1289 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1292 goto after_immediate_data;
1294 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1295 cmd->first_burst_len);
1296 after_immediate_data:
1297 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1299 * A PDU/CmdSN carrying Immediate Data passed
1300 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1301 * Immediate Bit is not set.
1303 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1304 (unsigned char *)hdr, hdr->cmdsn);
1305 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1308 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1311 rc = iscsit_dump_data_payload(cmd->conn,
1312 cmd->first_burst_len, 1);
1313 target_put_sess_cmd(&cmd->se_cmd);
1315 } else if (cmd->unsolicited_data)
1316 iscsit_set_unsoliticed_dataout(cmd);
1318 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1320 * Immediate Data failed DataCRC and ERL>=1,
1321 * silently drop this PDU and let the initiator
1322 * plug the CmdSN gap.
1324 * FIXME: Send Unsolicited NOPIN with reserved
1325 * TTT here to help the initiator figure out
1326 * the missing CmdSN, although they should be
1327 * intelligent enough to determine the missing
1328 * CmdSN and issue a retry to plug the sequence.
1330 cmd->i_state = ISTATE_REMOVE;
1331 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1332 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1339 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1342 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1344 bool dump_payload = false;
1346 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1350 * Allocation iovecs needed for struct socket operations for
1351 * traditional iSCSI block I/O.
1353 if (iscsit_allocate_iovecs(cmd) < 0) {
1354 return iscsit_reject_cmd(cmd,
1355 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1357 immed_data = cmd->immediate_data;
1359 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1363 dump_payload = true;
1368 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1371 static u32 iscsit_do_crypto_hash_sg(
1372 struct ahash_request *hash,
1373 struct iscsi_cmd *cmd,
1380 struct scatterlist *sg;
1381 unsigned int page_off;
1383 crypto_ahash_init(hash);
1385 sg = cmd->first_data_sg;
1386 page_off = cmd->first_data_sg_off;
1388 while (data_length) {
1389 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1391 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1392 crypto_ahash_update(hash);
1394 data_length -= cur_len;
1396 /* iscsit_map_iovec has already checked for invalid sg pointers */
1401 struct scatterlist pad_sg;
1403 sg_init_one(&pad_sg, pad_bytes, padding);
1404 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1406 crypto_ahash_finup(hash);
1408 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1409 crypto_ahash_final(hash);
1415 static void iscsit_do_crypto_hash_buf(
1416 struct ahash_request *hash,
1423 struct scatterlist sg[2];
1425 sg_init_table(sg, ARRAY_SIZE(sg));
1426 sg_set_buf(sg, buf, payload_length);
1427 sg_set_buf(sg + 1, pad_bytes, padding);
1429 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1431 crypto_ahash_digest(hash);
1435 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1436 struct iscsi_cmd *cmd, u32 payload_length,
1439 struct iscsi_data *hdr = buf;
1440 struct se_cmd *se_cmd;
1444 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1446 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1447 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1448 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1449 payload_length, conn->cid);
1451 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1452 pr_err("Command ITT: 0x%08x received DataOUT after"
1453 " last DataOUT received, dumping payload\n",
1454 cmd->init_task_tag);
1455 return iscsit_dump_data_payload(conn, payload_length, 1);
1458 if (cmd->data_direction != DMA_TO_DEVICE) {
1459 pr_err("Command ITT: 0x%08x received DataOUT for a"
1460 " NON-WRITE command.\n", cmd->init_task_tag);
1461 return iscsit_dump_data_payload(conn, payload_length, 1);
1463 se_cmd = &cmd->se_cmd;
1464 iscsit_mod_dataout_timer(cmd);
1466 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1467 pr_err("DataOut Offset: %u, Length %u greater than"
1468 " iSCSI Command EDTL %u, protocol error.\n",
1469 hdr->offset, payload_length, cmd->se_cmd.data_length);
1470 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1473 if (cmd->unsolicited_data) {
1474 int dump_unsolicited_data = 0;
1476 if (conn->sess->sess_ops->InitialR2T) {
1477 pr_err("Received unexpected unsolicited data"
1478 " while InitialR2T=Yes, protocol error.\n");
1479 transport_send_check_condition_and_sense(&cmd->se_cmd,
1480 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1484 * Special case for dealing with Unsolicited DataOUT
1485 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1489 /* Something's amiss if we're not in WRITE_PENDING state... */
1490 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1491 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1492 dump_unsolicited_data = 1;
1494 if (dump_unsolicited_data) {
1496 * Check if a delayed TASK_ABORTED status needs to
1497 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1498 * received with the unsolicited data out.
1500 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1501 iscsit_stop_dataout_timer(cmd);
1503 transport_check_aborted_status(se_cmd,
1504 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1505 return iscsit_dump_data_payload(conn, payload_length, 1);
1509 * For the normal solicited data path:
1511 * Check for a delayed TASK_ABORTED status and dump any
1512 * incoming data out payload if one exists. Also, when the
1513 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1514 * data out sequence, we decrement outstanding_r2ts. Once
1515 * outstanding_r2ts reaches zero, go ahead and send the delayed
1516 * TASK_ABORTED status.
1518 if (se_cmd->transport_state & CMD_T_ABORTED) {
1519 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1520 if (--cmd->outstanding_r2ts < 1) {
1521 iscsit_stop_dataout_timer(cmd);
1522 transport_check_aborted_status(
1526 return iscsit_dump_data_payload(conn, payload_length, 1);
1530 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1531 * within-command recovery checks before receiving the payload.
1533 rc = iscsit_check_pre_dataout(cmd, buf);
1534 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1536 else if (rc == DATAOUT_CANNOT_RECOVER)
1541 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1544 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1545 struct iscsi_cmd **out_cmd)
1547 struct iscsi_data *hdr = buf;
1548 struct iscsi_cmd *cmd;
1549 u32 payload_length = ntoh24(hdr->dlength);
1551 bool success = false;
1553 if (!payload_length) {
1554 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1558 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1559 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1560 " MaxXmitDataSegmentLength: %u\n", payload_length,
1561 conn->conn_ops->MaxXmitDataSegmentLength);
1562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1565 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1569 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1576 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1579 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1580 struct iscsi_data *hdr)
1583 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1584 u32 payload_length = ntoh24(hdr->dlength);
1585 int iov_ret, data_crc_failed = 0;
1587 rx_size += payload_length;
1588 iov = &cmd->iov_data[0];
1590 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1595 iov_count += iov_ret;
1597 padding = ((-payload_length) & 3);
1599 iov[iov_count].iov_base = cmd->pad_bytes;
1600 iov[iov_count++].iov_len = padding;
1602 pr_debug("Receiving %u padding bytes.\n", padding);
1605 if (conn->conn_ops->DataDigest) {
1606 iov[iov_count].iov_base = &checksum;
1607 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1608 rx_size += ISCSI_CRC_LEN;
1611 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1613 iscsit_unmap_iovec(cmd);
1615 if (rx_got != rx_size)
1618 if (conn->conn_ops->DataDigest) {
1621 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1622 be32_to_cpu(hdr->offset),
1623 payload_length, padding,
1626 if (checksum != data_crc) {
1627 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1628 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1629 " does not match computed 0x%08x\n",
1630 hdr->itt, hdr->offset, payload_length,
1631 hdr->datasn, checksum, data_crc);
1632 data_crc_failed = 1;
1634 pr_debug("Got CRC32C DataDigest 0x%08x for"
1635 " %u bytes of Data Out\n", checksum,
1640 return data_crc_failed;
1644 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1645 bool data_crc_failed)
1647 struct iscsi_conn *conn = cmd->conn;
1650 * Increment post receive data and CRC values or perform
1651 * within-command recovery.
1653 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1654 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1656 else if (rc == DATAOUT_SEND_R2T) {
1657 iscsit_set_dataout_sequence_values(cmd);
1658 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1659 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1661 * Handle extra special case for out of order
1662 * Unsolicited Data Out.
1664 spin_lock_bh(&cmd->istate_lock);
1665 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1666 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1667 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1668 spin_unlock_bh(&cmd->istate_lock);
1670 iscsit_stop_dataout_timer(cmd);
1673 target_execute_cmd(&cmd->se_cmd);
1675 } else /* DATAOUT_CANNOT_RECOVER */
1680 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1682 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1684 struct iscsi_cmd *cmd = NULL;
1685 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1687 bool data_crc_failed = false;
1689 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1695 rc = iscsit_get_dataout(conn, cmd, hdr);
1699 data_crc_failed = true;
1701 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1704 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1705 struct iscsi_nopout *hdr)
1707 u32 payload_length = ntoh24(hdr->dlength);
1709 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1710 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1712 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1713 (unsigned char *)hdr);
1715 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1716 (unsigned char *)hdr);
1719 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1720 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1721 " not set, protocol error.\n");
1723 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1724 (unsigned char *)hdr);
1726 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1727 (unsigned char *)hdr);
1730 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1731 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1732 " greater than MaxXmitDataSegmentLength: %u, protocol"
1733 " error.\n", payload_length,
1734 conn->conn_ops->MaxXmitDataSegmentLength);
1736 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1737 (unsigned char *)hdr);
1739 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1740 (unsigned char *)hdr);
1743 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1744 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1745 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1746 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1749 * This is not a response to a Unsolicited NopIN, which means
1750 * it can either be a NOPOUT ping request (with a valid ITT),
1751 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1752 * Either way, make sure we allocate an struct iscsi_cmd, as both
1753 * can contain ping data.
1755 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1756 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1757 cmd->i_state = ISTATE_SEND_NOPIN;
1758 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1760 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1761 cmd->targ_xfer_tag = 0xFFFFFFFF;
1762 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1763 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1764 cmd->data_direction = DMA_NONE;
1769 EXPORT_SYMBOL(iscsit_setup_nop_out);
1771 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1772 struct iscsi_nopout *hdr)
1774 struct iscsi_cmd *cmd_p = NULL;
1777 * Initiator is expecting a NopIN ping reply..
1779 if (hdr->itt != RESERVED_ITT) {
1781 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1782 (unsigned char *)hdr);
1784 spin_lock_bh(&conn->cmd_lock);
1785 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1786 spin_unlock_bh(&conn->cmd_lock);
1788 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1790 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1791 iscsit_add_cmd_to_response_queue(cmd, conn,
1796 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1797 (unsigned char *)hdr, hdr->cmdsn);
1798 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1800 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1806 * This was a response to a unsolicited NOPIN ping.
1808 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1809 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1813 iscsit_stop_nopin_response_timer(conn);
1815 cmd_p->i_state = ISTATE_REMOVE;
1816 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1818 iscsit_start_nopin_timer(conn);
1822 * Otherwise, initiator is not expecting a NOPIN is response.
1823 * Just ignore for now.
1827 iscsit_free_cmd(cmd, false);
1831 EXPORT_SYMBOL(iscsit_process_nop_out);
1833 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1836 unsigned char *ping_data = NULL;
1837 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1838 struct kvec *iov = NULL;
1839 u32 payload_length = ntoh24(hdr->dlength);
1842 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1846 * Handle NOP-OUT payload for traditional iSCSI sockets
1848 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1849 u32 checksum, data_crc, padding = 0;
1850 int niov = 0, rx_got, rx_size = payload_length;
1852 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1854 pr_err("Unable to allocate memory for"
1855 " NOPOUT ping data.\n");
1860 iov = &cmd->iov_misc[0];
1861 iov[niov].iov_base = ping_data;
1862 iov[niov++].iov_len = payload_length;
1864 padding = ((-payload_length) & 3);
1866 pr_debug("Receiving %u additional bytes"
1867 " for padding.\n", padding);
1868 iov[niov].iov_base = &cmd->pad_bytes;
1869 iov[niov++].iov_len = padding;
1872 if (conn->conn_ops->DataDigest) {
1873 iov[niov].iov_base = &checksum;
1874 iov[niov++].iov_len = ISCSI_CRC_LEN;
1875 rx_size += ISCSI_CRC_LEN;
1878 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1879 if (rx_got != rx_size) {
1884 if (conn->conn_ops->DataDigest) {
1885 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1886 ping_data, payload_length,
1887 padding, cmd->pad_bytes,
1890 if (checksum != data_crc) {
1891 pr_err("Ping data CRC32C DataDigest"
1892 " 0x%08x does not match computed 0x%08x\n",
1893 checksum, data_crc);
1894 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1895 pr_err("Unable to recover from"
1896 " NOPOUT Ping DataCRC failure while in"
1902 * Silently drop this PDU and let the
1903 * initiator plug the CmdSN gap.
1905 pr_debug("Dropping NOPOUT"
1906 " Command CmdSN: 0x%08x due to"
1907 " DataCRC error.\n", hdr->cmdsn);
1912 pr_debug("Got CRC32C DataDigest"
1913 " 0x%08x for %u bytes of ping data.\n",
1914 checksum, payload_length);
1918 ping_data[payload_length] = '\0';
1920 * Attach ping data to struct iscsi_cmd->buf_ptr.
1922 cmd->buf_ptr = ping_data;
1923 cmd->buf_ptr_size = payload_length;
1925 pr_debug("Got %u bytes of NOPOUT ping"
1926 " data.\n", payload_length);
1927 pr_debug("Ping Data: \"%s\"\n", ping_data);
1930 return iscsit_process_nop_out(conn, cmd, hdr);
1933 iscsit_free_cmd(cmd, false);
1939 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1941 switch (iscsi_tmf) {
1942 case ISCSI_TM_FUNC_ABORT_TASK:
1943 return TMR_ABORT_TASK;
1944 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1945 return TMR_ABORT_TASK_SET;
1946 case ISCSI_TM_FUNC_CLEAR_ACA:
1947 return TMR_CLEAR_ACA;
1948 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1949 return TMR_CLEAR_TASK_SET;
1950 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1951 return TMR_LUN_RESET;
1952 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1953 return TMR_TARGET_WARM_RESET;
1954 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1955 return TMR_TARGET_COLD_RESET;
1962 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1965 struct se_tmr_req *se_tmr;
1966 struct iscsi_tmr_req *tmr_req;
1967 struct iscsi_tm *hdr;
1968 int out_of_order_cmdsn = 0, ret;
1969 bool sess_ref = false;
1970 u8 function, tcm_function = TMR_UNKNOWN;
1972 hdr = (struct iscsi_tm *) buf;
1973 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1974 function = hdr->flags;
1976 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1977 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1978 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1979 hdr->rtt, hdr->refcmdsn, conn->cid);
1981 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1982 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1983 hdr->rtt != RESERVED_ITT)) {
1984 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1985 hdr->rtt = RESERVED_ITT;
1988 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1989 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1990 pr_err("Task Management Request TASK_REASSIGN not"
1991 " issued as immediate command, bad iSCSI Initiator"
1992 "implementation\n");
1993 return iscsit_add_reject_cmd(cmd,
1994 ISCSI_REASON_PROTOCOL_ERROR, buf);
1996 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1997 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1998 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2000 cmd->data_direction = DMA_NONE;
2002 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
2003 if (!cmd->tmr_req) {
2004 pr_err("Unable to allocate memory for"
2005 " Task Management command!\n");
2006 return iscsit_add_reject_cmd(cmd,
2007 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2012 * TASK_REASSIGN for ERL=2 / connection stays inside of
2013 * LIO-Target $FABRIC_MOD
2015 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2016 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2017 conn->sess->se_sess, 0, DMA_NONE,
2018 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2020 target_get_sess_cmd(&cmd->se_cmd, true);
2022 tcm_function = iscsit_convert_tmf(function);
2023 if (tcm_function == TMR_UNKNOWN) {
2024 pr_err("Unknown iSCSI TMR Function:"
2025 " 0x%02x\n", function);
2026 return iscsit_add_reject_cmd(cmd,
2027 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2030 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2033 return iscsit_add_reject_cmd(cmd,
2034 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2036 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2038 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2039 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2040 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2041 cmd->init_task_tag = hdr->itt;
2042 cmd->targ_xfer_tag = 0xFFFFFFFF;
2043 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2044 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2045 se_tmr = cmd->se_cmd.se_tmr_req;
2046 tmr_req = cmd->tmr_req;
2048 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2050 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2051 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2052 scsilun_to_int(&hdr->lun));
2054 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2060 case ISCSI_TM_FUNC_ABORT_TASK:
2061 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2062 if (se_tmr->response)
2065 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2066 case ISCSI_TM_FUNC_CLEAR_ACA:
2067 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2068 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2070 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2071 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2072 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2076 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2077 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2078 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2082 case ISCSI_TM_FUNC_TASK_REASSIGN:
2083 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2085 * Perform sanity checks on the ExpDataSN only if the
2086 * TASK_REASSIGN was successful.
2088 if (se_tmr->response)
2091 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2092 return iscsit_add_reject_cmd(cmd,
2093 ISCSI_REASON_BOOKMARK_INVALID, buf);
2096 pr_err("Unknown TMR function: 0x%02x, protocol"
2097 " error.\n", function);
2098 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2102 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2103 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2104 se_tmr->call_transport = 1;
2106 spin_lock_bh(&conn->cmd_lock);
2107 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2108 spin_unlock_bh(&conn->cmd_lock);
2110 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2111 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2112 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2113 out_of_order_cmdsn = 1;
2114 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2116 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2119 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2121 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2124 * Found the referenced task, send to transport for processing.
2126 if (se_tmr->call_transport)
2127 return transport_generic_handle_tmr(&cmd->se_cmd);
2130 * Could not find the referenced LUN, task, or Task Management
2131 * command not authorized or supported. Change state and
2132 * let the tx_thread send the response.
2134 * For connection recovery, this is also the default action for
2135 * TMR TASK_REASSIGN.
2138 pr_debug("Handle TMR, using sess_ref=true check\n");
2139 target_put_sess_cmd(&cmd->se_cmd);
2142 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2145 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2147 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2149 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2150 struct iscsi_text *hdr)
2152 u32 payload_length = ntoh24(hdr->dlength);
2154 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2155 pr_err("Unable to accept text parameter length: %u"
2156 "greater than MaxXmitDataSegmentLength %u.\n",
2157 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2158 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2159 (unsigned char *)hdr);
2162 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2163 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2164 pr_err("Multi sequence text commands currently not supported\n");
2165 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2166 (unsigned char *)hdr);
2169 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2170 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2171 hdr->exp_statsn, payload_length);
2173 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2174 cmd->i_state = ISTATE_SEND_TEXTRSP;
2175 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2176 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2177 cmd->targ_xfer_tag = 0xFFFFFFFF;
2178 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2179 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2180 cmd->data_direction = DMA_NONE;
2181 cmd->text_in_ptr = NULL;
2185 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2188 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2189 struct iscsi_text *hdr)
2191 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2195 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2196 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2197 pr_err("Unable to locate text_in buffer for sendtargets"
2201 goto empty_sendtargets;
2203 if (strncmp("SendTargets", text_in, 11) != 0) {
2204 pr_err("Received Text Data that is not"
2205 " SendTargets, cannot continue.\n");
2208 text_ptr = strchr(text_in, '=');
2210 pr_err("No \"=\" separator found in Text Data,"
2211 " cannot continue.\n");
2214 if (!strncmp("=All", text_ptr, 4)) {
2215 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2216 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2217 !strncmp("=eui.", text_ptr, 5)) {
2218 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2220 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2224 spin_lock_bh(&conn->cmd_lock);
2225 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2226 spin_unlock_bh(&conn->cmd_lock);
2229 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2231 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2232 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2233 (unsigned char *)hdr, hdr->cmdsn);
2234 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2240 return iscsit_execute_cmd(cmd, 0);
2243 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2244 (unsigned char *)hdr);
2246 EXPORT_SYMBOL(iscsit_process_text_cmd);
2249 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2252 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2253 char *text_in = NULL;
2254 u32 payload_length = ntoh24(hdr->dlength);
2257 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2261 rx_size = payload_length;
2262 if (payload_length) {
2263 u32 checksum = 0, data_crc = 0;
2264 u32 padding = 0, pad_bytes = 0;
2265 int niov = 0, rx_got;
2268 text_in = kzalloc(payload_length, GFP_KERNEL);
2270 pr_err("Unable to allocate memory for"
2271 " incoming text parameters\n");
2274 cmd->text_in_ptr = text_in;
2276 memset(iov, 0, 3 * sizeof(struct kvec));
2277 iov[niov].iov_base = text_in;
2278 iov[niov++].iov_len = payload_length;
2280 padding = ((-payload_length) & 3);
2282 iov[niov].iov_base = &pad_bytes;
2283 iov[niov++].iov_len = padding;
2285 pr_debug("Receiving %u additional bytes"
2286 " for padding.\n", padding);
2288 if (conn->conn_ops->DataDigest) {
2289 iov[niov].iov_base = &checksum;
2290 iov[niov++].iov_len = ISCSI_CRC_LEN;
2291 rx_size += ISCSI_CRC_LEN;
2294 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2295 if (rx_got != rx_size)
2298 if (conn->conn_ops->DataDigest) {
2299 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2300 text_in, payload_length,
2301 padding, (u8 *)&pad_bytes,
2304 if (checksum != data_crc) {
2305 pr_err("Text data CRC32C DataDigest"
2306 " 0x%08x does not match computed"
2307 " 0x%08x\n", checksum, data_crc);
2308 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2309 pr_err("Unable to recover from"
2310 " Text Data digest failure while in"
2315 * Silently drop this PDU and let the
2316 * initiator plug the CmdSN gap.
2318 pr_debug("Dropping Text"
2319 " Command CmdSN: 0x%08x due to"
2320 " DataCRC error.\n", hdr->cmdsn);
2325 pr_debug("Got CRC32C DataDigest"
2326 " 0x%08x for %u bytes of text data.\n",
2327 checksum, payload_length);
2330 text_in[payload_length - 1] = '\0';
2331 pr_debug("Successfully read %d bytes of text"
2332 " data.\n", payload_length);
2335 return iscsit_process_text_cmd(conn, cmd, hdr);
2338 kfree(cmd->text_in_ptr);
2339 cmd->text_in_ptr = NULL;
2340 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2343 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2345 struct iscsi_conn *conn_p;
2346 struct iscsi_session *sess = conn->sess;
2348 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2349 " for SID: %u.\n", conn->cid, conn->sess->sid);
2351 atomic_set(&sess->session_logout, 1);
2352 atomic_set(&conn->conn_logout_remove, 1);
2353 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2355 iscsit_inc_conn_usage_count(conn);
2356 iscsit_inc_session_usage_count(sess);
2358 spin_lock_bh(&sess->conn_lock);
2359 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2360 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2363 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2364 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2366 spin_unlock_bh(&sess->conn_lock);
2368 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2373 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2375 struct iscsi_conn *l_conn;
2376 struct iscsi_session *sess = conn->sess;
2378 pr_debug("Received logout request CLOSECONNECTION for CID:"
2379 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2382 * A Logout Request with a CLOSECONNECTION reason code for a CID
2383 * can arrive on a connection with a differing CID.
2385 if (conn->cid == cmd->logout_cid) {
2386 spin_lock_bh(&conn->state_lock);
2387 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2388 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2390 atomic_set(&conn->conn_logout_remove, 1);
2391 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2392 iscsit_inc_conn_usage_count(conn);
2394 spin_unlock_bh(&conn->state_lock);
2397 * Handle all different cid CLOSECONNECTION requests in
2398 * iscsit_logout_post_handler_diffcid() as to give enough
2399 * time for any non immediate command's CmdSN to be
2400 * acknowledged on the connection in question.
2402 * Here we simply make sure the CID is still around.
2404 l_conn = iscsit_get_conn_from_cid(sess,
2407 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2408 iscsit_add_cmd_to_response_queue(cmd, conn,
2413 iscsit_dec_conn_usage_count(l_conn);
2416 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2421 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2423 struct iscsi_session *sess = conn->sess;
2425 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2426 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2428 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2429 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2430 " while ERL!=2.\n");
2431 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2436 if (conn->cid == cmd->logout_cid) {
2437 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2438 " with CID: %hu on CID: %hu, implementation error.\n",
2439 cmd->logout_cid, conn->cid);
2440 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2441 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2445 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2451 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2454 int cmdsn_ret, logout_remove = 0;
2456 struct iscsi_logout *hdr;
2457 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2459 hdr = (struct iscsi_logout *) buf;
2460 reason_code = (hdr->flags & 0x7f);
2463 spin_lock(&tiqn->logout_stats.lock);
2464 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2465 tiqn->logout_stats.normal_logouts++;
2467 tiqn->logout_stats.abnormal_logouts++;
2468 spin_unlock(&tiqn->logout_stats.lock);
2471 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2472 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2473 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2474 hdr->cid, conn->cid);
2476 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2477 pr_err("Received logout request on connection that"
2478 " is not in logged in state, ignoring request.\n");
2479 iscsit_free_cmd(cmd, false);
2483 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2484 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2485 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2486 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2487 cmd->targ_xfer_tag = 0xFFFFFFFF;
2488 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2489 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2490 cmd->logout_cid = be16_to_cpu(hdr->cid);
2491 cmd->logout_reason = reason_code;
2492 cmd->data_direction = DMA_NONE;
2495 * We need to sleep in these cases (by returning 1) until the Logout
2496 * Response gets sent in the tx thread.
2498 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2499 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2500 be16_to_cpu(hdr->cid) == conn->cid))
2503 spin_lock_bh(&conn->cmd_lock);
2504 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2505 spin_unlock_bh(&conn->cmd_lock);
2507 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2508 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2511 * Immediate commands are executed, well, immediately.
2512 * Non-Immediate Logout Commands are executed in CmdSN order.
2514 if (cmd->immediate_cmd) {
2515 int ret = iscsit_execute_cmd(cmd, 0);
2520 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2521 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2523 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2527 return logout_remove;
2529 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2531 int iscsit_handle_snack(
2532 struct iscsi_conn *conn,
2535 struct iscsi_snack *hdr;
2537 hdr = (struct iscsi_snack *) buf;
2538 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2540 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2541 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2542 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2543 hdr->begrun, hdr->runlength, conn->cid);
2545 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2546 pr_err("Initiator sent SNACK request while in"
2547 " ErrorRecoveryLevel=0.\n");
2548 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2552 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2553 * call from inside iscsi_send_recovery_datain_or_r2t().
2555 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2557 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2559 be32_to_cpu(hdr->ttt),
2560 be32_to_cpu(hdr->begrun),
2561 be32_to_cpu(hdr->runlength));
2562 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2563 return iscsit_handle_status_snack(conn, hdr->itt,
2564 be32_to_cpu(hdr->ttt),
2565 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2566 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2567 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2568 be32_to_cpu(hdr->begrun),
2569 be32_to_cpu(hdr->runlength));
2570 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2571 /* FIXME: Support R-Data SNACK */
2572 pr_err("R-Data SNACK Not Supported.\n");
2573 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2576 pr_err("Unknown SNACK type 0x%02x, protocol"
2577 " error.\n", hdr->flags & 0x0f);
2578 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2584 EXPORT_SYMBOL(iscsit_handle_snack);
2586 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590 wait_for_completion_interruptible_timeout(
2591 &conn->rx_half_close_comp,
2592 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2596 static int iscsit_handle_immediate_data(
2597 struct iscsi_cmd *cmd,
2598 struct iscsi_scsi_req *hdr,
2601 int iov_ret, rx_got = 0, rx_size = 0;
2602 u32 checksum, iov_count = 0, padding = 0;
2603 struct iscsi_conn *conn = cmd->conn;
2606 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2608 return IMMEDIATE_DATA_CANNOT_RECOVER;
2611 iov_count = iov_ret;
2612 iov = &cmd->iov_data[0];
2614 padding = ((-length) & 3);
2616 iov[iov_count].iov_base = cmd->pad_bytes;
2617 iov[iov_count++].iov_len = padding;
2621 if (conn->conn_ops->DataDigest) {
2622 iov[iov_count].iov_base = &checksum;
2623 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2624 rx_size += ISCSI_CRC_LEN;
2627 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2629 iscsit_unmap_iovec(cmd);
2631 if (rx_got != rx_size) {
2632 iscsit_rx_thread_wait_for_tcp(conn);
2633 return IMMEDIATE_DATA_CANNOT_RECOVER;
2636 if (conn->conn_ops->DataDigest) {
2639 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2640 cmd->write_data_done, length, padding,
2643 if (checksum != data_crc) {
2644 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2645 " does not match computed 0x%08x\n", checksum,
2648 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2649 pr_err("Unable to recover from"
2650 " Immediate Data digest failure while"
2652 iscsit_reject_cmd(cmd,
2653 ISCSI_REASON_DATA_DIGEST_ERROR,
2654 (unsigned char *)hdr);
2655 return IMMEDIATE_DATA_CANNOT_RECOVER;
2657 iscsit_reject_cmd(cmd,
2658 ISCSI_REASON_DATA_DIGEST_ERROR,
2659 (unsigned char *)hdr);
2660 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2663 pr_debug("Got CRC32C DataDigest 0x%08x for"
2664 " %u bytes of Immediate Data\n", checksum,
2669 cmd->write_data_done += length;
2671 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2672 spin_lock_bh(&cmd->istate_lock);
2673 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2674 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2675 spin_unlock_bh(&cmd->istate_lock);
2678 return IMMEDIATE_DATA_NORMAL_OPERATION;
2682 * Called with sess->conn_lock held.
2684 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2685 with active network interface */
2686 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2688 struct iscsi_cmd *cmd;
2689 struct iscsi_conn *conn_p;
2693 * Only send a Asynchronous Message on connections whos network
2694 * interface is still functional.
2696 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2697 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2698 iscsit_inc_conn_usage_count(conn_p);
2707 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2709 iscsit_dec_conn_usage_count(conn_p);
2713 cmd->logout_cid = conn->cid;
2714 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2715 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2717 spin_lock_bh(&conn_p->cmd_lock);
2718 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2719 spin_unlock_bh(&conn_p->cmd_lock);
2721 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2722 iscsit_dec_conn_usage_count(conn_p);
2725 static int iscsit_send_conn_drop_async_message(
2726 struct iscsi_cmd *cmd,
2727 struct iscsi_conn *conn)
2729 struct iscsi_async *hdr;
2731 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2733 hdr = (struct iscsi_async *) cmd->pdu;
2734 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2735 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2736 cmd->init_task_tag = RESERVED_ITT;
2737 cmd->targ_xfer_tag = 0xFFFFFFFF;
2738 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2739 cmd->stat_sn = conn->stat_sn++;
2740 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2741 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2742 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2743 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2744 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2745 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2746 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2748 pr_debug("Sending Connection Dropped Async Message StatSN:"
2749 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2750 cmd->logout_cid, conn->cid);
2752 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2755 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2757 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2758 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2759 wait_for_completion_interruptible_timeout(
2760 &conn->tx_half_close_comp,
2761 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2766 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2767 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2770 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2771 hdr->flags = datain->flags;
2772 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2773 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2774 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2775 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2776 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2777 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2778 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2781 hton24(hdr->dlength, datain->length);
2782 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2783 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2784 (struct scsi_lun *)&hdr->lun);
2786 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2788 hdr->itt = cmd->init_task_tag;
2790 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2791 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2793 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2795 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2797 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2799 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2800 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2801 hdr->datasn = cpu_to_be32(datain->data_sn);
2802 hdr->offset = cpu_to_be32(datain->offset);
2804 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2805 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2806 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2807 ntohl(hdr->offset), datain->length, conn->cid);
2809 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2811 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2813 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2814 struct iscsi_datain datain;
2815 struct iscsi_datain_req *dr;
2817 bool set_statsn = false;
2819 memset(&datain, 0, sizeof(struct iscsi_datain));
2820 dr = iscsit_get_datain_values(cmd, &datain);
2822 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2823 cmd->init_task_tag);
2827 * Be paranoid and double check the logic for now.
2829 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2830 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2831 " datain.length: %u exceeds cmd->data_length: %u\n",
2832 cmd->init_task_tag, datain.offset, datain.length,
2833 cmd->se_cmd.data_length);
2837 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2839 * Special case for successfully execution w/ both DATAIN
2842 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2843 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2844 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2846 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2847 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2848 iscsit_increment_maxcmdsn(cmd, conn->sess);
2849 cmd->stat_sn = conn->stat_sn++;
2851 } else if (dr->dr_complete ==
2852 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2856 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2858 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2862 if (dr->dr_complete) {
2863 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2865 iscsit_free_datain_req(cmd, dr);
2872 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2873 struct iscsi_logout_rsp *hdr)
2875 struct iscsi_conn *logout_conn = NULL;
2876 struct iscsi_conn_recovery *cr = NULL;
2877 struct iscsi_session *sess = conn->sess;
2879 * The actual shutting down of Sessions and/or Connections
2880 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2881 * is done in scsi_logout_post_handler().
2883 switch (cmd->logout_reason) {
2884 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2885 pr_debug("iSCSI session logout successful, setting"
2886 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2887 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2889 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2890 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2893 * For CLOSECONNECTION logout requests carrying
2894 * a matching logout CID -> local CID, the reference
2895 * for the local CID will have been incremented in
2896 * iscsi_logout_closeconnection().
2898 * For CLOSECONNECTION logout requests carrying
2899 * a different CID than the connection it arrived
2900 * on, the connection responding to cmd->logout_cid
2901 * is stopped in iscsit_logout_post_handler_diffcid().
2904 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2905 " successful.\n", cmd->logout_cid, conn->cid);
2906 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2908 case ISCSI_LOGOUT_REASON_RECOVERY:
2909 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2910 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2913 * If the connection is still active from our point of view
2914 * force connection recovery to occur.
2916 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2919 iscsit_connection_reinstatement_rcfr(logout_conn);
2920 iscsit_dec_conn_usage_count(logout_conn);
2923 cr = iscsit_get_inactive_connection_recovery_entry(
2924 conn->sess, cmd->logout_cid);
2926 pr_err("Unable to locate CID: %hu for"
2927 " REMOVECONNFORRECOVERY Logout Request.\n",
2929 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2933 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2935 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2936 " for recovery for CID: %hu on CID: %hu successful.\n",
2937 cmd->logout_cid, conn->cid);
2938 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2941 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2942 cmd->logout_reason);
2946 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2947 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2948 hdr->response = cmd->logout_response;
2949 hdr->itt = cmd->init_task_tag;
2950 cmd->stat_sn = conn->stat_sn++;
2951 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2953 iscsit_increment_maxcmdsn(cmd, conn->sess);
2954 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2955 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2957 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2958 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2959 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2960 cmd->logout_cid, conn->cid);
2964 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2967 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2971 rc = iscsit_build_logout_rsp(cmd, conn,
2972 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2976 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2980 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2981 struct iscsi_nopin *hdr, bool nopout_response)
2983 hdr->opcode = ISCSI_OP_NOOP_IN;
2984 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2985 hton24(hdr->dlength, cmd->buf_ptr_size);
2986 if (nopout_response)
2987 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2988 hdr->itt = cmd->init_task_tag;
2989 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2990 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2992 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2994 if (nopout_response)
2995 iscsit_increment_maxcmdsn(cmd, conn->sess);
2997 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2998 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3000 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3001 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3002 "Solicited" : "Unsolicited", cmd->init_task_tag,
3003 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3005 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3008 * Unsolicited NOPIN, either requesting a response or not.
3010 static int iscsit_send_unsolicited_nopin(
3011 struct iscsi_cmd *cmd,
3012 struct iscsi_conn *conn,
3015 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3018 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3020 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3021 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3023 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3027 spin_lock_bh(&cmd->istate_lock);
3028 cmd->i_state = want_response ?
3029 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3030 spin_unlock_bh(&cmd->istate_lock);
3036 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3038 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3040 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3043 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3044 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3046 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3048 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3053 static int iscsit_send_r2t(
3054 struct iscsi_cmd *cmd,
3055 struct iscsi_conn *conn)
3057 struct iscsi_r2t *r2t;
3058 struct iscsi_r2t_rsp *hdr;
3061 r2t = iscsit_get_r2t_from_list(cmd);
3065 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3066 memset(hdr, 0, ISCSI_HDR_LEN);
3067 hdr->opcode = ISCSI_OP_R2T;
3068 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3069 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3070 (struct scsi_lun *)&hdr->lun);
3071 hdr->itt = cmd->init_task_tag;
3072 if (conn->conn_transport->iscsit_get_r2t_ttt)
3073 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3075 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3076 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3077 hdr->statsn = cpu_to_be32(conn->stat_sn);
3078 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3079 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3080 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3081 hdr->data_offset = cpu_to_be32(r2t->offset);
3082 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3084 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3085 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3086 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3087 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3088 r2t->offset, r2t->xfer_len, conn->cid);
3090 spin_lock_bh(&cmd->r2t_lock);
3092 spin_unlock_bh(&cmd->r2t_lock);
3094 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3099 spin_lock_bh(&cmd->dataout_timeout_lock);
3100 iscsit_start_dataout_timer(cmd, conn);
3101 spin_unlock_bh(&cmd->dataout_timeout_lock);
3107 * @recovery: If called from iscsi_task_reassign_complete_write() for
3108 * connection recovery.
3110 int iscsit_build_r2ts_for_cmd(
3111 struct iscsi_conn *conn,
3112 struct iscsi_cmd *cmd,
3116 u32 offset = 0, xfer_len = 0;
3118 spin_lock_bh(&cmd->r2t_lock);
3119 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3120 spin_unlock_bh(&cmd->r2t_lock);
3124 if (conn->sess->sess_ops->DataSequenceInOrder &&
3126 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3128 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3129 if (conn->sess->sess_ops->DataSequenceInOrder) {
3130 offset = cmd->r2t_offset;
3132 if (first_r2t && recovery) {
3133 int new_data_end = offset +
3134 conn->sess->sess_ops->MaxBurstLength -
3135 cmd->next_burst_len;
3137 if (new_data_end > cmd->se_cmd.data_length)
3138 xfer_len = cmd->se_cmd.data_length - offset;
3141 conn->sess->sess_ops->MaxBurstLength -
3142 cmd->next_burst_len;
3144 int new_data_end = offset +
3145 conn->sess->sess_ops->MaxBurstLength;
3147 if (new_data_end > cmd->se_cmd.data_length)
3148 xfer_len = cmd->se_cmd.data_length - offset;
3150 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3152 cmd->r2t_offset += xfer_len;
3154 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3155 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157 struct iscsi_seq *seq;
3159 seq = iscsit_get_seq_holder_for_r2t(cmd);
3161 spin_unlock_bh(&cmd->r2t_lock);
3165 offset = seq->offset;
3166 xfer_len = seq->xfer_len;
3168 if (cmd->seq_send_order == cmd->seq_count)
3169 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3171 cmd->outstanding_r2ts++;
3174 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3175 spin_unlock_bh(&cmd->r2t_lock);
3179 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3182 spin_unlock_bh(&cmd->r2t_lock);
3186 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3188 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3189 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3192 cmd->stat_sn = conn->stat_sn++;
3194 atomic_long_inc(&conn->sess->rsp_pdus);
3196 memset(hdr, 0, ISCSI_HDR_LEN);
3197 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3198 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3199 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3200 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3201 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3202 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3203 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3204 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3206 hdr->response = cmd->iscsi_response;
3207 hdr->cmd_status = cmd->se_cmd.scsi_status;
3208 hdr->itt = cmd->init_task_tag;
3209 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3211 iscsit_increment_maxcmdsn(cmd, conn->sess);
3212 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3213 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3215 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3216 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3217 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3218 cmd->se_cmd.scsi_status, conn->cid);
3220 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3222 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3224 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3225 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3226 void *data_buf = NULL;
3227 u32 padding = 0, data_buf_len = 0;
3229 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3232 * Attach SENSE DATA payload to iSCSI Response PDU
3234 if (cmd->se_cmd.sense_buffer &&
3235 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3236 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3237 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3238 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3240 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3241 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3242 data_buf = cmd->sense_buffer;
3243 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3246 memset(cmd->sense_buffer +
3247 cmd->se_cmd.scsi_sense_length, 0, padding);
3248 pr_debug("Adding %u bytes of padding to"
3249 " SENSE.\n", padding);
3252 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3254 cmd->se_cmd.scsi_sense_length);
3257 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3261 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3263 switch (se_tmr->response) {
3264 case TMR_FUNCTION_COMPLETE:
3265 return ISCSI_TMF_RSP_COMPLETE;
3266 case TMR_TASK_DOES_NOT_EXIST:
3267 return ISCSI_TMF_RSP_NO_TASK;
3268 case TMR_LUN_DOES_NOT_EXIST:
3269 return ISCSI_TMF_RSP_NO_LUN;
3270 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3271 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3272 case TMR_FUNCTION_REJECTED:
3274 return ISCSI_TMF_RSP_REJECTED;
3279 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3280 struct iscsi_tm_rsp *hdr)
3282 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3284 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3285 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3286 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3287 hdr->itt = cmd->init_task_tag;
3288 cmd->stat_sn = conn->stat_sn++;
3289 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3291 iscsit_increment_maxcmdsn(cmd, conn->sess);
3292 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3293 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3295 pr_debug("Built Task Management Response ITT: 0x%08x,"
3296 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3297 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3299 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3302 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3304 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3306 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3308 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3311 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3315 if (np->np_sockaddr.ss_family == AF_INET6) {
3316 const struct sockaddr_in6 sin6 = {
3317 .sin6_addr = IN6ADDR_ANY_INIT };
3318 struct sockaddr_in6 *sock_in6 =
3319 (struct sockaddr_in6 *)&np->np_sockaddr;
3321 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3322 sin6.sin6_addr.s6_addr, 16))
3325 struct sockaddr_in * sock_in =
3326 (struct sockaddr_in *)&np->np_sockaddr;
3328 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3335 #define SENDTARGETS_BUF_LIMIT 32768U
3338 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3339 enum iscsit_transport_type network_transport,
3340 int skip_bytes, bool *completed)
3342 char *payload = NULL;
3343 struct iscsi_conn *conn = cmd->conn;
3344 struct iscsi_portal_group *tpg;
3345 struct iscsi_tiqn *tiqn;
3346 struct iscsi_tpg_np *tpg_np;
3347 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3348 int target_name_printed;
3349 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3350 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3353 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3354 SENDTARGETS_BUF_LIMIT);
3356 payload = kzalloc(buffer_len, GFP_KERNEL);
3358 pr_err("Unable to allocate memory for sendtargets"
3363 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3366 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3367 text_ptr = strchr(text_in, '=');
3369 pr_err("Unable to locate '=' string in text_in:"
3375 * Skip over '=' character..
3380 spin_lock(&tiqn_lock);
3381 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3382 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3383 strcmp(tiqn->tiqn, text_ptr)) {
3387 target_name_printed = 0;
3389 spin_lock(&tiqn->tiqn_tpg_lock);
3390 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3392 /* If demo_mode_discovery=0 and generate_node_acls=0
3393 * (demo mode dislabed) do not return
3394 * TargetName+TargetAddress unless a NodeACL exists.
3397 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3398 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3399 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3400 cmd->conn->sess->sess_ops->InitiatorName))) {
3404 spin_lock(&tpg->tpg_state_lock);
3405 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3406 spin_unlock(&tpg->tpg_state_lock);
3408 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3411 spin_lock(&tpg->tpg_np_lock);
3412 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3414 struct iscsi_np *np = tpg_np->tpg_np;
3415 bool inaddr_any = iscsit_check_inaddr_any(np);
3416 struct sockaddr_storage *sockaddr;
3418 if (np->np_network_transport != network_transport)
3421 if (!target_name_printed) {
3422 len = sprintf(buf, "TargetName=%s",
3426 if ((len + payload_len) > buffer_len) {
3427 spin_unlock(&tpg->tpg_np_lock);
3428 spin_unlock(&tiqn->tiqn_tpg_lock);
3433 if (skip_bytes && len <= skip_bytes) {
3436 memcpy(payload + payload_len, buf, len);
3438 target_name_printed = 1;
3439 if (len > skip_bytes)
3445 sockaddr = &conn->local_sockaddr;
3447 sockaddr = &np->np_sockaddr;
3449 len = sprintf(buf, "TargetAddress="
3455 if ((len + payload_len) > buffer_len) {
3456 spin_unlock(&tpg->tpg_np_lock);
3457 spin_unlock(&tiqn->tiqn_tpg_lock);
3462 if (skip_bytes && len <= skip_bytes) {
3465 memcpy(payload + payload_len, buf, len);
3467 if (len > skip_bytes)
3471 spin_unlock(&tpg->tpg_np_lock);
3473 spin_unlock(&tiqn->tiqn_tpg_lock);
3480 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3483 spin_unlock(&tiqn_lock);
3485 cmd->buf_ptr = payload;
3491 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3492 struct iscsi_text_rsp *hdr,
3493 enum iscsit_transport_type network_transport)
3495 int text_length, padding;
3496 bool completed = true;
3498 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3499 cmd->read_data_done,
3501 if (text_length < 0)
3505 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3507 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3508 cmd->read_data_done += text_length;
3509 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3510 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3512 hdr->opcode = ISCSI_OP_TEXT_RSP;
3513 padding = ((-text_length) & 3);
3514 hton24(hdr->dlength, text_length);
3515 hdr->itt = cmd->init_task_tag;
3516 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3517 cmd->stat_sn = conn->stat_sn++;
3518 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3520 iscsit_increment_maxcmdsn(cmd, conn->sess);
3522 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3523 * correctly increment MaxCmdSN for each response answering a
3524 * non immediate text request with a valid CmdSN.
3526 cmd->maxcmdsn_inc = 0;
3527 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3528 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3530 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3531 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3532 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3533 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3534 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3536 return text_length + padding;
3538 EXPORT_SYMBOL(iscsit_build_text_rsp);
3540 static int iscsit_send_text_rsp(
3541 struct iscsi_cmd *cmd,
3542 struct iscsi_conn *conn)
3544 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3547 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3548 conn->conn_transport->transport_type);
3549 if (text_length < 0)
3552 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3558 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3559 struct iscsi_reject *hdr)
3561 hdr->opcode = ISCSI_OP_REJECT;
3562 hdr->reason = cmd->reject_reason;
3563 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3564 hton24(hdr->dlength, ISCSI_HDR_LEN);
3565 hdr->ffffffff = cpu_to_be32(0xffffffff);
3566 cmd->stat_sn = conn->stat_sn++;
3567 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3568 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3569 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3572 EXPORT_SYMBOL(iscsit_build_reject);
3574 static int iscsit_send_reject(
3575 struct iscsi_cmd *cmd,
3576 struct iscsi_conn *conn)
3578 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3580 iscsit_build_reject(cmd, conn, hdr);
3582 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3583 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3585 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3590 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3594 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3595 * within iscsit_start_kthreads()
3597 * Here we use bitmap_id to determine which CPU that this
3598 * iSCSI connection's RX/TX threads will be scheduled to
3601 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3602 for_each_online_cpu(cpu) {
3604 cpumask_set_cpu(cpu, conn->conn_cpumask);
3609 * This should never be reached..
3612 cpumask_setall(conn->conn_cpumask);
3616 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3621 case ISTATE_SEND_R2T:
3622 ret = iscsit_send_r2t(cmd, conn);
3627 spin_lock_bh(&conn->cmd_lock);
3628 list_del_init(&cmd->i_conn_node);
3629 spin_unlock_bh(&conn->cmd_lock);
3631 iscsit_free_cmd(cmd, false);
3633 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3634 iscsit_mod_nopin_response_timer(conn);
3635 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3639 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3640 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3645 pr_err("Unknown Opcode: 0x%02x ITT:"
3646 " 0x%08x, i_state: %d on CID: %hu\n",
3647 cmd->iscsi_opcode, cmd->init_task_tag, state,
3657 EXPORT_SYMBOL(iscsit_immediate_queue);
3660 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3662 struct iscsit_transport *t = conn->conn_transport;
3663 struct iscsi_queue_req *qr;
3664 struct iscsi_cmd *cmd;
3668 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3669 atomic_set(&conn->check_immediate_queue, 0);
3672 kmem_cache_free(lio_qr_cache, qr);
3674 ret = t->iscsit_immediate_queue(conn, cmd, state);
3683 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3689 case ISTATE_SEND_DATAIN:
3690 ret = iscsit_send_datain(cmd, conn);
3695 goto check_rsp_state;
3696 else if (ret == 1) {
3698 spin_lock_bh(&cmd->istate_lock);
3699 cmd->i_state = ISTATE_SENT_STATUS;
3700 spin_unlock_bh(&cmd->istate_lock);
3702 if (atomic_read(&conn->check_immediate_queue))
3706 } else if (ret == 2) {
3707 /* Still must send status,
3708 SCF_TRANSPORT_TASK_SENSE was set */
3709 spin_lock_bh(&cmd->istate_lock);
3710 cmd->i_state = ISTATE_SEND_STATUS;
3711 spin_unlock_bh(&cmd->istate_lock);
3712 state = ISTATE_SEND_STATUS;
3713 goto check_rsp_state;
3717 case ISTATE_SEND_STATUS:
3718 case ISTATE_SEND_STATUS_RECOVERY:
3719 ret = iscsit_send_response(cmd, conn);
3721 case ISTATE_SEND_LOGOUTRSP:
3722 ret = iscsit_send_logout(cmd, conn);
3724 case ISTATE_SEND_ASYNCMSG:
3725 ret = iscsit_send_conn_drop_async_message(
3728 case ISTATE_SEND_NOPIN:
3729 ret = iscsit_send_nopin(cmd, conn);
3731 case ISTATE_SEND_REJECT:
3732 ret = iscsit_send_reject(cmd, conn);
3734 case ISTATE_SEND_TASKMGTRSP:
3735 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3738 ret = iscsit_tmr_post_handler(cmd, conn);
3740 iscsit_fall_back_to_erl0(conn->sess);
3742 case ISTATE_SEND_TEXTRSP:
3743 ret = iscsit_send_text_rsp(cmd, conn);
3746 pr_err("Unknown Opcode: 0x%02x ITT:"
3747 " 0x%08x, i_state: %d on CID: %hu\n",
3748 cmd->iscsi_opcode, cmd->init_task_tag,
3756 case ISTATE_SEND_LOGOUTRSP:
3757 if (!iscsit_logout_post_handler(cmd, conn))
3760 case ISTATE_SEND_STATUS:
3761 case ISTATE_SEND_ASYNCMSG:
3762 case ISTATE_SEND_NOPIN:
3763 case ISTATE_SEND_STATUS_RECOVERY:
3764 case ISTATE_SEND_TEXTRSP:
3765 case ISTATE_SEND_TASKMGTRSP:
3766 case ISTATE_SEND_REJECT:
3767 spin_lock_bh(&cmd->istate_lock);
3768 cmd->i_state = ISTATE_SENT_STATUS;
3769 spin_unlock_bh(&cmd->istate_lock);
3772 pr_err("Unknown Opcode: 0x%02x ITT:"
3773 " 0x%08x, i_state: %d on CID: %hu\n",
3774 cmd->iscsi_opcode, cmd->init_task_tag,
3775 cmd->i_state, conn->cid);
3779 if (atomic_read(&conn->check_immediate_queue))
3787 EXPORT_SYMBOL(iscsit_response_queue);
3789 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3791 struct iscsit_transport *t = conn->conn_transport;
3792 struct iscsi_queue_req *qr;
3793 struct iscsi_cmd *cmd;
3797 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3800 kmem_cache_free(lio_qr_cache, qr);
3802 ret = t->iscsit_response_queue(conn, cmd, state);
3803 if (ret == 1 || ret < 0)
3810 int iscsi_target_tx_thread(void *arg)
3813 struct iscsi_conn *conn = arg;
3815 * Allow ourselves to be interrupted by SIGINT so that a
3816 * connection recovery / failure event can be triggered externally.
3818 allow_signal(SIGINT);
3820 while (!kthread_should_stop()) {
3822 * Ensure that both TX and RX per connection kthreads
3823 * are scheduled to run on the same CPU.
3825 iscsit_thread_check_cpumask(conn, current, 1);
3827 wait_event_interruptible(conn->queues_wq,
3828 !iscsit_conn_all_queues_empty(conn));
3830 if (signal_pending(current))
3834 ret = iscsit_handle_immediate_queue(conn);
3838 ret = iscsit_handle_response_queue(conn);
3841 else if (ret == -ECONNRESET)
3849 * Avoid the normal connection failure code-path if this connection
3850 * is still within LOGIN mode, and iscsi_np process context is
3851 * responsible for cleaning up the early connection failure.
3853 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3854 iscsit_take_action_for_connection_exit(conn);
3859 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3861 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3862 struct iscsi_cmd *cmd;
3865 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3866 case ISCSI_OP_SCSI_CMD:
3867 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3871 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3873 case ISCSI_OP_SCSI_DATA_OUT:
3874 ret = iscsit_handle_data_out(conn, buf);
3876 case ISCSI_OP_NOOP_OUT:
3878 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3879 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3883 ret = iscsit_handle_nop_out(conn, cmd, buf);
3885 case ISCSI_OP_SCSI_TMFUNC:
3886 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3890 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3893 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3894 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3898 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3903 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3905 case ISCSI_OP_LOGOUT:
3906 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3910 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3912 wait_for_completion_timeout(&conn->conn_logout_comp,
3913 SECONDS_FOR_LOGOUT_COMP * HZ);
3915 case ISCSI_OP_SNACK:
3916 ret = iscsit_handle_snack(conn, buf);
3919 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3920 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3921 pr_err("Cannot recover from unknown"
3922 " opcode while ERL=0, closing iSCSI connection.\n");
3925 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3926 " closing iSCSI connection.\n");
3933 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3936 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3940 spin_lock_bh(&conn->state_lock);
3941 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3942 spin_unlock_bh(&conn->state_lock);
3947 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3950 u8 buffer[ISCSI_HDR_LEN], opcode;
3951 u32 checksum = 0, digest = 0;
3954 while (!kthread_should_stop()) {
3956 * Ensure that both TX and RX per connection kthreads
3957 * are scheduled to run on the same CPU.
3959 iscsit_thread_check_cpumask(conn, current, 0);
3961 memset(buffer, 0, ISCSI_HDR_LEN);
3962 memset(&iov, 0, sizeof(struct kvec));
3964 iov.iov_base = buffer;
3965 iov.iov_len = ISCSI_HDR_LEN;
3967 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3968 if (ret != ISCSI_HDR_LEN) {
3969 iscsit_rx_thread_wait_for_tcp(conn);
3973 if (conn->conn_ops->HeaderDigest) {
3974 iov.iov_base = &digest;
3975 iov.iov_len = ISCSI_CRC_LEN;
3977 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3978 if (ret != ISCSI_CRC_LEN) {
3979 iscsit_rx_thread_wait_for_tcp(conn);
3983 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3984 buffer, ISCSI_HDR_LEN,
3985 0, NULL, (u8 *)&checksum);
3987 if (digest != checksum) {
3988 pr_err("HeaderDigest CRC32C failed,"
3989 " received 0x%08x, computed 0x%08x\n",
3992 * Set the PDU to 0xff so it will intentionally
3993 * hit default in the switch below.
3995 memset(buffer, 0xff, ISCSI_HDR_LEN);
3996 atomic_long_inc(&conn->sess->conn_digest_errors);
3998 pr_debug("Got HeaderDigest CRC32C"
3999 " 0x%08x\n", checksum);
4003 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4006 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4008 if (conn->sess->sess_ops->SessionType &&
4009 ((!(opcode & ISCSI_OP_TEXT)) ||
4010 (!(opcode & ISCSI_OP_LOGOUT)))) {
4011 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4012 " while in Discovery Session, rejecting.\n", opcode);
4013 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4018 ret = iscsi_target_rx_opcode(conn, buffer);
4024 int iscsi_target_rx_thread(void *arg)
4027 struct iscsi_conn *conn = arg;
4030 * Allow ourselves to be interrupted by SIGINT so that a
4031 * connection recovery / failure event can be triggered externally.
4033 allow_signal(SIGINT);
4035 * Wait for iscsi_post_login_handler() to complete before allowing
4036 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4038 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4039 if (rc < 0 || iscsi_target_check_conn_state(conn))
4042 if (!conn->conn_transport->iscsit_get_rx_pdu)
4045 conn->conn_transport->iscsit_get_rx_pdu(conn);
4047 if (!signal_pending(current))
4048 atomic_set(&conn->transport_failed, 1);
4049 iscsit_take_action_for_connection_exit(conn);
4053 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4055 LIST_HEAD(tmp_list);
4056 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4057 struct iscsi_session *sess = conn->sess;
4059 * We expect this function to only ever be called from either RX or TX
4060 * thread context via iscsit_close_connection() once the other context
4061 * has been reset -> returned sleeping pre-handler state.
4063 spin_lock_bh(&conn->cmd_lock);
4064 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4066 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4067 struct se_cmd *se_cmd = &cmd->se_cmd;
4069 if (se_cmd->se_tfo != NULL) {
4070 spin_lock(&se_cmd->t_state_lock);
4071 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4072 spin_unlock(&se_cmd->t_state_lock);
4075 spin_unlock_bh(&conn->cmd_lock);
4077 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4078 list_del_init(&cmd->i_conn_node);
4080 iscsit_increment_maxcmdsn(cmd, sess);
4081 iscsit_free_cmd(cmd, true);
4086 static void iscsit_stop_timers_for_cmds(
4087 struct iscsi_conn *conn)
4089 struct iscsi_cmd *cmd;
4091 spin_lock_bh(&conn->cmd_lock);
4092 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4093 if (cmd->data_direction == DMA_TO_DEVICE)
4094 iscsit_stop_dataout_timer(cmd);
4096 spin_unlock_bh(&conn->cmd_lock);
4099 int iscsit_close_connection(
4100 struct iscsi_conn *conn)
4102 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4103 struct iscsi_session *sess = conn->sess;
4105 pr_debug("Closing iSCSI connection CID %hu on SID:"
4106 " %u\n", conn->cid, sess->sid);
4108 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4109 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4110 * sleeping and the logout response never got sent because the
4111 * connection failed.
4113 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4114 * to signal logout response TX interrupt completion. Go ahead and skip
4115 * this for iser since isert_rx_opcode() does not wait on logout failure,
4116 * and to avoid iscsi_conn pointer dereference in iser-target code.
4118 if (!conn->conn_transport->rdma_shutdown)
4119 complete(&conn->conn_logout_comp);
4121 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4122 if (conn->tx_thread &&
4123 cmpxchg(&conn->tx_thread_active, true, false)) {
4124 send_sig(SIGINT, conn->tx_thread, 1);
4125 kthread_stop(conn->tx_thread);
4127 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4128 if (conn->rx_thread &&
4129 cmpxchg(&conn->rx_thread_active, true, false)) {
4130 send_sig(SIGINT, conn->rx_thread, 1);
4131 kthread_stop(conn->rx_thread);
4135 spin_lock(&iscsit_global->ts_bitmap_lock);
4136 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4138 spin_unlock(&iscsit_global->ts_bitmap_lock);
4140 iscsit_stop_timers_for_cmds(conn);
4141 iscsit_stop_nopin_response_timer(conn);
4142 iscsit_stop_nopin_timer(conn);
4144 if (conn->conn_transport->iscsit_wait_conn)
4145 conn->conn_transport->iscsit_wait_conn(conn);
4148 * During Connection recovery drop unacknowledged out of order
4149 * commands for this connection, and prepare the other commands
4152 * During normal operation clear the out of order commands (but
4153 * do not free the struct iscsi_ooo_cmdsn's) and release all
4154 * struct iscsi_cmds.
4156 if (atomic_read(&conn->connection_recovery)) {
4157 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4158 iscsit_prepare_cmds_for_reallegiance(conn);
4160 iscsit_clear_ooo_cmdsns_for_conn(conn);
4161 iscsit_release_commands_from_conn(conn);
4163 iscsit_free_queue_reqs_for_conn(conn);
4166 * Handle decrementing session or connection usage count if
4167 * a logout response was not able to be sent because the
4168 * connection failed. Fall back to Session Recovery here.
4170 if (atomic_read(&conn->conn_logout_remove)) {
4171 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4172 iscsit_dec_conn_usage_count(conn);
4173 iscsit_dec_session_usage_count(sess);
4175 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4176 iscsit_dec_conn_usage_count(conn);
4178 atomic_set(&conn->conn_logout_remove, 0);
4179 atomic_set(&sess->session_reinstatement, 0);
4180 atomic_set(&sess->session_fall_back_to_erl0, 1);
4183 spin_lock_bh(&sess->conn_lock);
4184 list_del(&conn->conn_list);
4187 * Attempt to let the Initiator know this connection failed by
4188 * sending an Connection Dropped Async Message on another
4189 * active connection.
4191 if (atomic_read(&conn->connection_recovery))
4192 iscsit_build_conn_drop_async_message(conn);
4194 spin_unlock_bh(&sess->conn_lock);
4197 * If connection reinstatement is being performed on this connection,
4198 * up the connection reinstatement semaphore that is being blocked on
4199 * in iscsit_cause_connection_reinstatement().
4201 spin_lock_bh(&conn->state_lock);
4202 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4203 spin_unlock_bh(&conn->state_lock);
4204 complete(&conn->conn_wait_comp);
4205 wait_for_completion(&conn->conn_post_wait_comp);
4206 spin_lock_bh(&conn->state_lock);
4210 * If connection reinstatement is being performed on this connection
4211 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4212 * connection wait rcfr semaphore that is being blocked on
4213 * an iscsit_connection_reinstatement_rcfr().
4215 if (atomic_read(&conn->connection_wait_rcfr)) {
4216 spin_unlock_bh(&conn->state_lock);
4217 complete(&conn->conn_wait_rcfr_comp);
4218 wait_for_completion(&conn->conn_post_wait_comp);
4219 spin_lock_bh(&conn->state_lock);
4221 atomic_set(&conn->connection_reinstatement, 1);
4222 spin_unlock_bh(&conn->state_lock);
4225 * If any other processes are accessing this connection pointer we
4226 * must wait until they have completed.
4228 iscsit_check_conn_usage_count(conn);
4230 ahash_request_free(conn->conn_tx_hash);
4231 if (conn->conn_rx_hash) {
4232 struct crypto_ahash *tfm;
4234 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4235 ahash_request_free(conn->conn_rx_hash);
4236 crypto_free_ahash(tfm);
4239 free_cpumask_var(conn->conn_cpumask);
4241 kfree(conn->conn_ops);
4242 conn->conn_ops = NULL;
4245 sock_release(conn->sock);
4247 if (conn->conn_transport->iscsit_free_conn)
4248 conn->conn_transport->iscsit_free_conn(conn);
4250 iscsit_put_transport(conn->conn_transport);
4252 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4253 conn->conn_state = TARG_CONN_STATE_FREE;
4256 spin_lock_bh(&sess->conn_lock);
4257 atomic_dec(&sess->nconn);
4258 pr_debug("Decremented iSCSI connection count to %hu from node:"
4259 " %s\n", atomic_read(&sess->nconn),
4260 sess->sess_ops->InitiatorName);
4262 * Make sure that if one connection fails in an non ERL=2 iSCSI
4263 * Session that they all fail.
4265 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4266 !atomic_read(&sess->session_logout))
4267 atomic_set(&sess->session_fall_back_to_erl0, 1);
4270 * If this was not the last connection in the session, and we are
4271 * performing session reinstatement or falling back to ERL=0, call
4272 * iscsit_stop_session() without sleeping to shutdown the other
4273 * active connections.
4275 if (atomic_read(&sess->nconn)) {
4276 if (!atomic_read(&sess->session_reinstatement) &&
4277 !atomic_read(&sess->session_fall_back_to_erl0)) {
4278 spin_unlock_bh(&sess->conn_lock);
4281 if (!atomic_read(&sess->session_stop_active)) {
4282 atomic_set(&sess->session_stop_active, 1);
4283 spin_unlock_bh(&sess->conn_lock);
4284 iscsit_stop_session(sess, 0, 0);
4287 spin_unlock_bh(&sess->conn_lock);
4292 * If this was the last connection in the session and one of the
4293 * following is occurring:
4295 * Session Reinstatement is not being performed, and are falling back
4296 * to ERL=0 call iscsit_close_session().
4298 * Session Logout was requested. iscsit_close_session() will be called
4301 * Session Continuation is not being performed, start the Time2Retain
4302 * handler and check if sleep_on_sess_wait_sem is active.
4304 if (!atomic_read(&sess->session_reinstatement) &&
4305 atomic_read(&sess->session_fall_back_to_erl0)) {
4306 spin_unlock_bh(&sess->conn_lock);
4307 iscsit_close_session(sess);
4310 } else if (atomic_read(&sess->session_logout)) {
4311 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4312 sess->session_state = TARG_SESS_STATE_FREE;
4313 spin_unlock_bh(&sess->conn_lock);
4315 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4316 complete(&sess->session_wait_comp);
4320 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4321 sess->session_state = TARG_SESS_STATE_FAILED;
4323 if (!atomic_read(&sess->session_continuation)) {
4324 spin_unlock_bh(&sess->conn_lock);
4325 iscsit_start_time2retain_handler(sess);
4327 spin_unlock_bh(&sess->conn_lock);
4329 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4330 complete(&sess->session_wait_comp);
4337 * If the iSCSI Session for the iSCSI Initiator Node exists,
4338 * forcefully shutdown the iSCSI NEXUS.
4340 int iscsit_close_session(struct iscsi_session *sess)
4342 struct iscsi_portal_group *tpg = sess->tpg;
4343 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4345 if (atomic_read(&sess->nconn)) {
4346 pr_err("%d connection(s) still exist for iSCSI session"
4347 " to %s\n", atomic_read(&sess->nconn),
4348 sess->sess_ops->InitiatorName);
4352 spin_lock_bh(&se_tpg->session_lock);
4353 atomic_set(&sess->session_logout, 1);
4354 atomic_set(&sess->session_reinstatement, 1);
4355 iscsit_stop_time2retain_timer(sess);
4356 spin_unlock_bh(&se_tpg->session_lock);
4359 * transport_deregister_session_configfs() will clear the
4360 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4361 * can be setting it again with __transport_register_session() in
4362 * iscsi_post_login_handler() again after the iscsit_stop_session()
4363 * completes in iscsi_np context.
4365 transport_deregister_session_configfs(sess->se_sess);
4368 * If any other processes are accessing this session pointer we must
4369 * wait until they have completed. If we are in an interrupt (the
4370 * time2retain handler) and contain and active session usage count we
4371 * restart the timer and exit.
4373 if (!in_interrupt()) {
4374 if (iscsit_check_session_usage_count(sess) == 1)
4375 iscsit_stop_session(sess, 1, 1);
4377 if (iscsit_check_session_usage_count(sess) == 2) {
4378 atomic_set(&sess->session_logout, 0);
4379 iscsit_start_time2retain_handler(sess);
4384 transport_deregister_session(sess->se_sess);
4386 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4387 iscsit_free_connection_recovery_entires(sess);
4389 iscsit_free_all_ooo_cmdsns(sess);
4391 spin_lock_bh(&se_tpg->session_lock);
4392 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4393 sess->session_state = TARG_SESS_STATE_FREE;
4394 pr_debug("Released iSCSI session from node: %s\n",
4395 sess->sess_ops->InitiatorName);
4398 tpg->tpg_tiqn->tiqn_nsessions--;
4400 pr_debug("Decremented number of active iSCSI Sessions on"
4401 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4403 spin_lock(&sess_idr_lock);
4404 idr_remove(&sess_idr, sess->session_index);
4405 spin_unlock(&sess_idr_lock);
4407 kfree(sess->sess_ops);
4408 sess->sess_ops = NULL;
4409 spin_unlock_bh(&se_tpg->session_lock);
4415 static void iscsit_logout_post_handler_closesession(
4416 struct iscsi_conn *conn)
4418 struct iscsi_session *sess = conn->sess;
4421 * Traditional iscsi/tcp will invoke this logic from TX thread
4422 * context during session logout, so clear tx_thread_active and
4423 * sleep if iscsit_close_connection() has not already occured.
4425 * Since iser-target invokes this logic from it's own workqueue,
4426 * always sleep waiting for RX/TX thread shutdown to complete
4427 * within iscsit_close_connection().
4429 if (!conn->conn_transport->rdma_shutdown)
4430 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4432 atomic_set(&conn->conn_logout_remove, 0);
4433 complete(&conn->conn_logout_comp);
4435 iscsit_dec_conn_usage_count(conn);
4436 iscsit_stop_session(sess, sleep, sleep);
4437 iscsit_dec_session_usage_count(sess);
4438 iscsit_close_session(sess);
4441 static void iscsit_logout_post_handler_samecid(
4442 struct iscsi_conn *conn)
4446 if (!conn->conn_transport->rdma_shutdown)
4447 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4449 atomic_set(&conn->conn_logout_remove, 0);
4450 complete(&conn->conn_logout_comp);
4452 iscsit_cause_connection_reinstatement(conn, sleep);
4453 iscsit_dec_conn_usage_count(conn);
4456 static void iscsit_logout_post_handler_diffcid(
4457 struct iscsi_conn *conn,
4460 struct iscsi_conn *l_conn;
4461 struct iscsi_session *sess = conn->sess;
4462 bool conn_found = false;
4467 spin_lock_bh(&sess->conn_lock);
4468 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4469 if (l_conn->cid == cid) {
4470 iscsit_inc_conn_usage_count(l_conn);
4475 spin_unlock_bh(&sess->conn_lock);
4481 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4483 spin_lock_bh(&l_conn->state_lock);
4484 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4485 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4486 spin_unlock_bh(&l_conn->state_lock);
4488 iscsit_cause_connection_reinstatement(l_conn, 1);
4489 iscsit_dec_conn_usage_count(l_conn);
4493 * Return of 0 causes the TX thread to restart.
4495 int iscsit_logout_post_handler(
4496 struct iscsi_cmd *cmd,
4497 struct iscsi_conn *conn)
4501 switch (cmd->logout_reason) {
4502 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4503 switch (cmd->logout_response) {
4504 case ISCSI_LOGOUT_SUCCESS:
4505 case ISCSI_LOGOUT_CLEANUP_FAILED:
4507 iscsit_logout_post_handler_closesession(conn);
4512 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4513 if (conn->cid == cmd->logout_cid) {
4514 switch (cmd->logout_response) {
4515 case ISCSI_LOGOUT_SUCCESS:
4516 case ISCSI_LOGOUT_CLEANUP_FAILED:
4518 iscsit_logout_post_handler_samecid(conn);
4523 switch (cmd->logout_response) {
4524 case ISCSI_LOGOUT_SUCCESS:
4525 iscsit_logout_post_handler_diffcid(conn,
4528 case ISCSI_LOGOUT_CID_NOT_FOUND:
4529 case ISCSI_LOGOUT_CLEANUP_FAILED:
4536 case ISCSI_LOGOUT_REASON_RECOVERY:
4537 switch (cmd->logout_response) {
4538 case ISCSI_LOGOUT_SUCCESS:
4539 case ISCSI_LOGOUT_CID_NOT_FOUND:
4540 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4541 case ISCSI_LOGOUT_CLEANUP_FAILED:
4553 EXPORT_SYMBOL(iscsit_logout_post_handler);
4555 void iscsit_fail_session(struct iscsi_session *sess)
4557 struct iscsi_conn *conn;
4559 spin_lock_bh(&sess->conn_lock);
4560 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4561 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4562 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4564 spin_unlock_bh(&sess->conn_lock);
4566 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4567 sess->session_state = TARG_SESS_STATE_FAILED;
4570 int iscsit_free_session(struct iscsi_session *sess)
4572 u16 conn_count = atomic_read(&sess->nconn);
4573 struct iscsi_conn *conn, *conn_tmp = NULL;
4576 spin_lock_bh(&sess->conn_lock);
4577 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4579 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4581 if (conn_count == 0)
4584 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4587 iscsit_inc_conn_usage_count(conn_tmp);
4590 iscsit_inc_conn_usage_count(conn);
4592 spin_unlock_bh(&sess->conn_lock);
4593 iscsit_cause_connection_reinstatement(conn, 1);
4594 spin_lock_bh(&sess->conn_lock);
4596 iscsit_dec_conn_usage_count(conn);
4598 iscsit_dec_conn_usage_count(conn_tmp);
4603 if (atomic_read(&sess->nconn)) {
4604 spin_unlock_bh(&sess->conn_lock);
4605 wait_for_completion(&sess->session_wait_comp);
4607 spin_unlock_bh(&sess->conn_lock);
4609 iscsit_close_session(sess);
4613 void iscsit_stop_session(
4614 struct iscsi_session *sess,
4616 int connection_sleep)
4618 u16 conn_count = atomic_read(&sess->nconn);
4619 struct iscsi_conn *conn, *conn_tmp = NULL;
4622 spin_lock_bh(&sess->conn_lock);
4624 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4626 if (connection_sleep) {
4627 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4629 if (conn_count == 0)
4632 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4635 iscsit_inc_conn_usage_count(conn_tmp);
4638 iscsit_inc_conn_usage_count(conn);
4640 spin_unlock_bh(&sess->conn_lock);
4641 iscsit_cause_connection_reinstatement(conn, 1);
4642 spin_lock_bh(&sess->conn_lock);
4644 iscsit_dec_conn_usage_count(conn);
4646 iscsit_dec_conn_usage_count(conn_tmp);
4650 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4651 iscsit_cause_connection_reinstatement(conn, 0);
4654 if (session_sleep && atomic_read(&sess->nconn)) {
4655 spin_unlock_bh(&sess->conn_lock);
4656 wait_for_completion(&sess->session_wait_comp);
4658 spin_unlock_bh(&sess->conn_lock);
4661 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4663 struct iscsi_session *sess;
4664 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4665 struct se_session *se_sess, *se_sess_tmp;
4666 LIST_HEAD(free_list);
4667 int session_count = 0;
4669 spin_lock_bh(&se_tpg->session_lock);
4670 if (tpg->nsessions && !force) {
4671 spin_unlock_bh(&se_tpg->session_lock);
4675 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4677 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4679 spin_lock(&sess->conn_lock);
4680 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4681 atomic_read(&sess->session_logout) ||
4682 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4683 spin_unlock(&sess->conn_lock);
4686 atomic_set(&sess->session_reinstatement, 1);
4687 spin_unlock(&sess->conn_lock);
4689 list_move_tail(&se_sess->sess_list, &free_list);
4691 spin_unlock_bh(&se_tpg->session_lock);
4693 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4694 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4696 iscsit_free_session(sess);
4700 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4701 " Group: %hu\n", session_count, tpg->tpgt);
4705 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4706 MODULE_VERSION("4.1.x");
4707 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4708 MODULE_LICENSE("GPL");
4710 module_init(iscsi_target_init_module);
4711 module_exit(iscsi_target_cleanup_module);