1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <linux/idr.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/iscsi_proto.h>
30 #include <scsi/scsi_tcq.h>
31 #include <target/target_core_base.h>
32 #include <target/target_core_fabric.h>
33 #include <target/target_core_configfs.h>
35 #include "iscsi_target_core.h"
36 #include "iscsi_target_parameters.h"
37 #include "iscsi_target_seq_pdu_list.h"
38 #include "iscsi_target_tq.h"
39 #include "iscsi_target_configfs.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include "iscsi_target_stat.h"
52 #include <target/iscsi/iscsi_transport.h>
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_SPINLOCK(np_lock);
59 static struct idr tiqn_idr;
61 struct mutex auth_id_lock;
62 spinlock_t sess_idr_lock;
64 struct iscsit_global *iscsit_global;
66 struct kmem_cache *lio_cmd_cache;
67 struct kmem_cache *lio_qr_cache;
68 struct kmem_cache *lio_dr_cache;
69 struct kmem_cache *lio_ooo_cache;
70 struct kmem_cache *lio_r2t_cache;
72 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
73 struct iscsi_scsi_req *, u32);
75 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
77 struct iscsi_tiqn *tiqn = NULL;
79 spin_lock(&tiqn_lock);
80 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
81 if (!strcmp(tiqn->tiqn, buf)) {
83 spin_lock(&tiqn->tiqn_state_lock);
84 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
85 tiqn->tiqn_access_count++;
86 spin_unlock(&tiqn->tiqn_state_lock);
87 spin_unlock(&tiqn_lock);
90 spin_unlock(&tiqn->tiqn_state_lock);
93 spin_unlock(&tiqn_lock);
98 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
100 spin_lock(&tiqn->tiqn_state_lock);
101 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
102 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
103 spin_unlock(&tiqn->tiqn_state_lock);
106 spin_unlock(&tiqn->tiqn_state_lock);
111 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
113 spin_lock(&tiqn->tiqn_state_lock);
114 tiqn->tiqn_access_count--;
115 spin_unlock(&tiqn->tiqn_state_lock);
119 * Note that IQN formatting is expected to be done in userspace, and
120 * no explict IQN format checks are done here.
122 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
124 struct iscsi_tiqn *tiqn = NULL;
127 if (strlen(buf) >= ISCSI_IQN_LEN) {
128 pr_err("Target IQN exceeds %d bytes\n",
130 return ERR_PTR(-EINVAL);
133 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
135 pr_err("Unable to allocate struct iscsi_tiqn\n");
136 return ERR_PTR(-ENOMEM);
139 sprintf(tiqn->tiqn, "%s", buf);
140 INIT_LIST_HEAD(&tiqn->tiqn_list);
141 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
142 spin_lock_init(&tiqn->tiqn_state_lock);
143 spin_lock_init(&tiqn->tiqn_tpg_lock);
144 spin_lock_init(&tiqn->sess_err_stats.lock);
145 spin_lock_init(&tiqn->login_stats.lock);
146 spin_lock_init(&tiqn->logout_stats.lock);
148 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
150 idr_preload(GFP_KERNEL);
151 spin_lock(&tiqn_lock);
153 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
155 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
156 spin_unlock(&tiqn_lock);
161 tiqn->tiqn_index = ret;
162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
164 spin_unlock(&tiqn_lock);
167 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
173 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
176 * Wait for accesses to said struct iscsi_tiqn to end.
178 spin_lock(&tiqn->tiqn_state_lock);
179 while (tiqn->tiqn_access_count != 0) {
180 spin_unlock(&tiqn->tiqn_state_lock);
182 spin_lock(&tiqn->tiqn_state_lock);
184 spin_unlock(&tiqn->tiqn_state_lock);
187 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
190 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
191 * while holding tiqn->tiqn_state_lock. This means that all subsequent
192 * attempts to access this struct iscsi_tiqn will fail from both transport
193 * fabric and control code paths.
195 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
196 pr_err("iscsit_set_tiqn_shutdown() failed\n");
200 iscsit_wait_for_tiqn(tiqn);
202 spin_lock(&tiqn_lock);
203 list_del(&tiqn->tiqn_list);
204 idr_remove(&tiqn_idr, tiqn->tiqn_index);
205 spin_unlock(&tiqn_lock);
207 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
212 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
216 * Determine if the network portal is accepting storage traffic.
218 spin_lock_bh(&np->np_thread_lock);
219 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
220 spin_unlock_bh(&np->np_thread_lock);
223 if (np->np_login_tpg) {
224 pr_err("np->np_login_tpg() is not NULL!\n");
225 spin_unlock_bh(&np->np_thread_lock);
228 spin_unlock_bh(&np->np_thread_lock);
230 * Determine if the portal group is accepting storage traffic.
232 spin_lock_bh(&tpg->tpg_state_lock);
233 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
234 spin_unlock_bh(&tpg->tpg_state_lock);
237 spin_unlock_bh(&tpg->tpg_state_lock);
240 * Here we serialize access across the TIQN+TPG Tuple.
242 ret = mutex_lock_interruptible(&tpg->np_login_lock);
243 if ((ret != 0) || signal_pending(current))
246 spin_lock_bh(&np->np_thread_lock);
247 np->np_login_tpg = tpg;
248 spin_unlock_bh(&np->np_thread_lock);
253 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
255 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
257 spin_lock_bh(&np->np_thread_lock);
258 np->np_login_tpg = NULL;
259 spin_unlock_bh(&np->np_thread_lock);
261 mutex_unlock(&tpg->np_login_lock);
264 iscsit_put_tiqn_for_login(tiqn);
269 bool iscsit_check_np_match(
270 struct __kernel_sockaddr_storage *sockaddr,
272 int network_transport)
274 struct sockaddr_in *sock_in, *sock_in_e;
275 struct sockaddr_in6 *sock_in6, *sock_in6_e;
276 bool ip_match = false;
279 if (sockaddr->ss_family == AF_INET6) {
280 sock_in6 = (struct sockaddr_in6 *)sockaddr;
281 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
283 if (!memcmp(&sock_in6->sin6_addr.in6_u,
284 &sock_in6_e->sin6_addr.in6_u,
285 sizeof(struct in6_addr)))
288 port = ntohs(sock_in6->sin6_port);
290 sock_in = (struct sockaddr_in *)sockaddr;
291 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
293 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
296 port = ntohs(sock_in->sin_port);
299 if ((ip_match == true) && (np->np_port == port) &&
300 (np->np_network_transport == network_transport))
306 static struct iscsi_np *iscsit_get_np(
307 struct __kernel_sockaddr_storage *sockaddr,
308 int network_transport)
313 spin_lock_bh(&np_lock);
314 list_for_each_entry(np, &g_np_list, np_list) {
315 spin_lock(&np->np_thread_lock);
316 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
317 spin_unlock(&np->np_thread_lock);
321 match = iscsit_check_np_match(sockaddr, np, network_transport);
324 * Increment the np_exports reference count now to
325 * prevent iscsit_del_np() below from being called
326 * while iscsi_tpg_add_network_portal() is called.
329 spin_unlock(&np->np_thread_lock);
330 spin_unlock_bh(&np_lock);
333 spin_unlock(&np->np_thread_lock);
335 spin_unlock_bh(&np_lock);
340 struct iscsi_np *iscsit_add_np(
341 struct __kernel_sockaddr_storage *sockaddr,
343 int network_transport)
345 struct sockaddr_in *sock_in;
346 struct sockaddr_in6 *sock_in6;
350 * Locate the existing struct iscsi_np if already active..
352 np = iscsit_get_np(sockaddr, network_transport);
356 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
358 pr_err("Unable to allocate memory for struct iscsi_np\n");
359 return ERR_PTR(-ENOMEM);
362 np->np_flags |= NPF_IP_NETWORK;
363 if (sockaddr->ss_family == AF_INET6) {
364 sock_in6 = (struct sockaddr_in6 *)sockaddr;
365 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
366 np->np_port = ntohs(sock_in6->sin6_port);
368 sock_in = (struct sockaddr_in *)sockaddr;
369 sprintf(np->np_ip, "%s", ip_str);
370 np->np_port = ntohs(sock_in->sin_port);
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);
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
392 * Increment the np_exports reference count now to prevent
393 * iscsit_del_np() below from being run while a new call to
394 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
395 * active. We don't need to hold np->np_thread_lock at this
396 * point because iscsi_np has not been added to g_np_list yet.
400 spin_lock_bh(&np_lock);
401 list_add_tail(&np->np_list, &g_np_list);
402 spin_unlock_bh(&np_lock);
404 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
405 np->np_ip, np->np_port, np->np_transport->name);
410 int iscsit_reset_np_thread(
412 struct iscsi_tpg_np *tpg_np,
413 struct iscsi_portal_group *tpg)
415 spin_lock_bh(&np->np_thread_lock);
418 * The reset operation need only be performed when the
419 * passed struct iscsi_portal_group has a login in progress
420 * to one of the network portals.
422 if (tpg_np->tpg_np->np_login_tpg != tpg) {
423 spin_unlock_bh(&np->np_thread_lock);
427 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
428 spin_unlock_bh(&np->np_thread_lock);
431 np->np_thread_state = ISCSI_NP_THREAD_RESET;
434 spin_unlock_bh(&np->np_thread_lock);
435 send_sig(SIGINT, np->np_thread, 1);
436 wait_for_completion(&np->np_restart_comp);
437 spin_lock_bh(&np->np_thread_lock);
439 spin_unlock_bh(&np->np_thread_lock);
444 static void iscsit_free_np(struct iscsi_np *np)
447 sock_release(np->np_socket);
450 int iscsit_del_np(struct iscsi_np *np)
452 spin_lock_bh(&np->np_thread_lock);
454 if (np->np_exports) {
455 spin_unlock_bh(&np->np_thread_lock);
458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
459 spin_unlock_bh(&np->np_thread_lock);
463 * We need to send the signal to wakeup Linux/Net
464 * which may be sleeping in sock_accept()..
466 send_sig(SIGINT, np->np_thread, 1);
467 kthread_stop(np->np_thread);
470 np->np_transport->iscsit_free_np(np);
472 spin_lock_bh(&np_lock);
473 list_del(&np->np_list);
474 spin_unlock_bh(&np_lock);
476 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
477 np->np_ip, np->np_port, np->np_transport->name);
479 iscsit_put_transport(np->np_transport);
484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
489 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
493 static struct iscsit_transport iscsi_target_transport = {
495 .transport_type = ISCSI_TCP,
497 .iscsit_setup_np = iscsit_setup_np,
498 .iscsit_accept_np = iscsit_accept_np,
499 .iscsit_free_np = iscsit_free_np,
500 .iscsit_alloc_cmd = iscsit_alloc_cmd,
501 .iscsit_get_login_rx = iscsit_get_login_rx,
502 .iscsit_put_login_tx = iscsit_put_login_tx,
503 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
504 .iscsit_immediate_queue = iscsit_immediate_queue,
505 .iscsit_response_queue = iscsit_response_queue,
506 .iscsit_queue_data_in = iscsit_queue_rsp,
507 .iscsit_queue_status = iscsit_queue_rsp,
510 static int __init iscsi_target_init_module(void)
514 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
516 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
517 if (!iscsit_global) {
518 pr_err("Unable to allocate memory for iscsit_global\n");
521 mutex_init(&auth_id_lock);
522 spin_lock_init(&sess_idr_lock);
526 ret = iscsi_target_register_configfs();
530 ret = iscsi_thread_set_init();
534 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
535 TARGET_THREAD_SET_COUNT) {
536 pr_err("iscsi_allocate_thread_sets() returned"
537 " unexpected value!\n");
541 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
542 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
544 if (!lio_cmd_cache) {
545 pr_err("Unable to kmem_cache_create() for"
550 lio_qr_cache = kmem_cache_create("lio_qr_cache",
551 sizeof(struct iscsi_queue_req),
552 __alignof__(struct iscsi_queue_req), 0, NULL);
554 pr_err("nable to kmem_cache_create() for"
559 lio_dr_cache = kmem_cache_create("lio_dr_cache",
560 sizeof(struct iscsi_datain_req),
561 __alignof__(struct iscsi_datain_req), 0, NULL);
563 pr_err("Unable to kmem_cache_create() for"
568 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
569 sizeof(struct iscsi_ooo_cmdsn),
570 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
571 if (!lio_ooo_cache) {
572 pr_err("Unable to kmem_cache_create() for"
577 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
578 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
580 if (!lio_r2t_cache) {
581 pr_err("Unable to kmem_cache_create() for"
586 iscsit_register_transport(&iscsi_target_transport);
588 if (iscsit_load_discovery_tpg() < 0)
593 kmem_cache_destroy(lio_r2t_cache);
595 kmem_cache_destroy(lio_ooo_cache);
597 kmem_cache_destroy(lio_dr_cache);
599 kmem_cache_destroy(lio_qr_cache);
601 kmem_cache_destroy(lio_cmd_cache);
603 iscsi_deallocate_thread_sets();
605 iscsi_thread_set_free();
607 iscsi_target_deregister_configfs();
609 kfree(iscsit_global);
613 static void __exit iscsi_target_cleanup_module(void)
615 iscsi_deallocate_thread_sets();
616 iscsi_thread_set_free();
617 iscsit_release_discovery_tpg();
618 iscsit_unregister_transport(&iscsi_target_transport);
619 kmem_cache_destroy(lio_cmd_cache);
620 kmem_cache_destroy(lio_qr_cache);
621 kmem_cache_destroy(lio_dr_cache);
622 kmem_cache_destroy(lio_ooo_cache);
623 kmem_cache_destroy(lio_r2t_cache);
625 iscsi_target_deregister_configfs();
627 kfree(iscsit_global);
630 static int iscsit_add_reject(
634 struct iscsi_conn *conn)
636 struct iscsi_cmd *cmd;
637 struct iscsi_reject *hdr;
640 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
644 cmd->iscsi_opcode = ISCSI_OP_REJECT;
646 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
648 hdr = (struct iscsi_reject *) cmd->pdu;
649 hdr->reason = reason;
651 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
653 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
654 iscsit_release_cmd(cmd);
658 spin_lock_bh(&conn->cmd_lock);
659 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
660 spin_unlock_bh(&conn->cmd_lock);
662 cmd->i_state = ISTATE_SEND_REJECT;
663 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
665 ret = wait_for_completion_interruptible(&cmd->reject_comp);
669 return (!fail_conn) ? 0 : -1;
672 int iscsit_add_reject_from_cmd(
677 struct iscsi_cmd *cmd)
679 struct iscsi_conn *conn;
680 struct iscsi_reject *hdr;
684 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
690 cmd->iscsi_opcode = ISCSI_OP_REJECT;
692 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
694 hdr = (struct iscsi_reject *) cmd->pdu;
695 hdr->reason = reason;
697 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
699 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
700 iscsit_release_cmd(cmd);
705 spin_lock_bh(&conn->cmd_lock);
706 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
707 spin_unlock_bh(&conn->cmd_lock);
710 cmd->i_state = ISTATE_SEND_REJECT;
711 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
713 ret = wait_for_completion_interruptible(&cmd->reject_comp);
715 * Perform the kref_put now if se_cmd has already been setup by
716 * scsit_setup_scsi_cmd()
718 if (cmd->se_cmd.se_tfo != NULL) {
719 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
720 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
725 return (!fail_conn) ? 0 : -1;
727 EXPORT_SYMBOL(iscsit_add_reject_from_cmd);
730 * Map some portion of the allocated scatterlist to an iovec, suitable for
731 * kernel sockets to copy data in/out.
733 static int iscsit_map_iovec(
734 struct iscsi_cmd *cmd,
740 struct scatterlist *sg;
741 unsigned int page_off;
744 * We know each entry in t_data_sg contains a page.
746 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
747 page_off = (data_offset % PAGE_SIZE);
749 cmd->first_data_sg = sg;
750 cmd->first_data_sg_off = page_off;
752 while (data_length) {
753 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
755 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
756 iov[i].iov_len = cur_len;
758 data_length -= cur_len;
764 cmd->kmapped_nents = i;
769 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
772 struct scatterlist *sg;
774 sg = cmd->first_data_sg;
776 for (i = 0; i < cmd->kmapped_nents; i++)
777 kunmap(sg_page(&sg[i]));
780 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
782 struct iscsi_cmd *cmd;
784 conn->exp_statsn = exp_statsn;
786 if (conn->sess->sess_ops->RDMAExtensions)
789 spin_lock_bh(&conn->cmd_lock);
790 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
791 spin_lock(&cmd->istate_lock);
792 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
793 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
794 cmd->i_state = ISTATE_REMOVE;
795 spin_unlock(&cmd->istate_lock);
796 iscsit_add_cmd_to_immediate_queue(cmd, conn,
800 spin_unlock(&cmd->istate_lock);
802 spin_unlock_bh(&conn->cmd_lock);
805 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
807 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
809 iov_count += ISCSI_IOV_DATA_BUFFER;
811 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
812 if (!cmd->iov_data) {
813 pr_err("Unable to allocate cmd->iov_data\n");
817 cmd->orig_iov_data_count = iov_count;
821 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
824 int data_direction, payload_length;
825 struct iscsi_scsi_req *hdr;
829 spin_lock_bh(&conn->sess->session_stats_lock);
830 conn->sess->cmd_pdus++;
831 if (conn->sess->se_sess->se_node_acl) {
832 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
833 conn->sess->se_sess->se_node_acl->num_cmds++;
834 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
836 spin_unlock_bh(&conn->sess->session_stats_lock);
838 hdr = (struct iscsi_scsi_req *) buf;
839 payload_length = ntoh24(hdr->dlength);
841 /* FIXME; Add checks for AdditionalHeaderSegment */
843 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
844 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
845 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
846 " not set. Bad iSCSI Initiator.\n");
847 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
851 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
852 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
854 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
855 * that adds support for RESERVE/RELEASE. There is a bug
856 * add with this new functionality that sets R/W bits when
857 * neither CDB carries any READ or WRITE datapayloads.
859 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
860 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
861 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
865 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
866 " set when Expected Data Transfer Length is 0 for"
867 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
868 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
873 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
874 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
875 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
876 " MUST be set if Expected Data Transfer Length is not 0."
877 " Bad iSCSI Initiator\n");
878 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
882 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
883 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
884 pr_err("Bidirectional operations not supported!\n");
885 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
889 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
890 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
891 " Scsi Command PDU.\n");
892 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
896 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
897 pr_err("ImmediateData=No but DataSegmentLength=%u,"
898 " protocol error.\n", payload_length);
899 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
903 if ((be32_to_cpu(hdr->data_length )== payload_length) &&
904 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
905 pr_err("Expected Data Transfer Length and Length of"
906 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
907 " bit is not set protocol error\n");
908 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
912 if (payload_length > be32_to_cpu(hdr->data_length)) {
913 pr_err("DataSegmentLength: %u is greater than"
914 " EDTL: %u, protocol error.\n", payload_length,
916 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
920 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
921 pr_err("DataSegmentLength: %u is greater than"
922 " MaxXmitDataSegmentLength: %u, protocol error.\n",
923 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
924 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
928 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
929 pr_err("DataSegmentLength: %u is greater than"
930 " FirstBurstLength: %u, protocol error.\n",
931 payload_length, conn->sess->sess_ops->FirstBurstLength);
932 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
936 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
937 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
940 cmd->data_direction = data_direction;
941 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
943 * Figure out the SAM Task Attribute for the incoming SCSI CDB
945 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
946 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
947 sam_task_attr = MSG_SIMPLE_TAG;
948 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
949 sam_task_attr = MSG_ORDERED_TAG;
950 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
951 sam_task_attr = MSG_HEAD_TAG;
952 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
953 sam_task_attr = MSG_ACA_TAG;
955 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
956 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
957 sam_task_attr = MSG_SIMPLE_TAG;
960 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
961 cmd->i_state = ISTATE_NEW_CMD;
962 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
963 cmd->immediate_data = (payload_length) ? 1 : 0;
964 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
965 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
966 if (cmd->unsolicited_data)
967 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
969 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
970 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
971 spin_lock_bh(&conn->sess->ttt_lock);
972 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
973 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
974 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
975 spin_unlock_bh(&conn->sess->ttt_lock);
976 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
977 cmd->targ_xfer_tag = 0xFFFFFFFF;
978 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
979 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
980 cmd->first_burst_len = payload_length;
982 if (!conn->sess->sess_ops->RDMAExtensions &&
983 cmd->data_direction == DMA_FROM_DEVICE) {
984 struct iscsi_datain_req *dr;
986 dr = iscsit_allocate_datain_req();
988 return iscsit_add_reject_from_cmd(
989 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
992 iscsit_attach_datain_req(cmd, dr);
996 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
998 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
999 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1000 cmd->data_direction, sam_task_attr,
1001 cmd->sense_buffer + 2);
1003 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1004 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1005 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1008 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1010 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1011 scsilun_to_int(&hdr->lun));
1012 if (cmd->sense_reason)
1015 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1016 if (cmd->sense_reason) {
1017 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1018 return iscsit_add_reject_from_cmd(
1019 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1026 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1027 return iscsit_add_reject_from_cmd(
1028 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1033 spin_lock_bh(&conn->cmd_lock);
1034 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1035 spin_unlock_bh(&conn->cmd_lock);
1037 * Check if we need to delay processing because of ALUA
1038 * Active/NonOptimized primary access state..
1040 core_alua_check_nonop_delay(&cmd->se_cmd);
1044 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1046 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1048 iscsit_set_dataout_sequence_values(cmd);
1050 spin_lock_bh(&cmd->dataout_timeout_lock);
1051 iscsit_start_dataout_timer(cmd, cmd->conn);
1052 spin_unlock_bh(&cmd->dataout_timeout_lock);
1054 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1056 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1057 struct iscsi_scsi_req *hdr)
1061 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1062 * the Immediate Bit is not set, and no Immediate
1065 * A PDU/CmdSN carrying Immediate Data can only
1066 * be processed after the DataCRC has passed.
1067 * If the DataCRC fails, the CmdSN MUST NOT
1068 * be acknowledged. (See below)
1070 if (!cmd->immediate_data) {
1071 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1072 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1073 if (!cmd->sense_reason)
1076 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1078 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
1079 return iscsit_add_reject_from_cmd(
1080 ISCSI_REASON_PROTOCOL_ERROR,
1081 1, 0, (unsigned char *)hdr, cmd);
1085 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1088 * If no Immediate Data is attached, it's OK to return now.
1090 if (!cmd->immediate_data) {
1091 if (!cmd->sense_reason && cmd->unsolicited_data)
1092 iscsit_set_unsoliticed_dataout(cmd);
1093 if (!cmd->sense_reason)
1096 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1101 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1102 * execution. These exceptions are processed in CmdSN order using
1103 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1105 if (cmd->sense_reason) {
1106 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1110 * Call directly into transport_generic_new_cmd() to perform
1111 * the backend memory allocation.
1113 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1114 if (cmd->sense_reason) {
1115 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1121 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1124 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1127 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1129 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1131 if (dump_payload == true)
1132 goto after_immediate_data;
1134 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1135 cmd->first_burst_len);
1136 after_immediate_data:
1137 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1139 * A PDU/CmdSN carrying Immediate Data passed
1140 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1141 * Immediate Bit is not set.
1143 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, hdr->cmdsn);
1145 if (cmd->sense_reason) {
1146 if (iscsit_dump_data_payload(cmd->conn,
1147 cmd->first_burst_len, 1) < 0)
1149 } else if (cmd->unsolicited_data)
1150 iscsit_set_unsoliticed_dataout(cmd);
1152 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1153 return iscsit_add_reject_from_cmd(
1154 ISCSI_REASON_PROTOCOL_ERROR,
1155 1, 0, (unsigned char *)hdr, cmd);
1157 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1159 * Immediate Data failed DataCRC and ERL>=1,
1160 * silently drop this PDU and let the initiator
1161 * plug the CmdSN gap.
1163 * FIXME: Send Unsolicited NOPIN with reserved
1164 * TTT here to help the initiator figure out
1165 * the missing CmdSN, although they should be
1166 * intelligent enough to determine the missing
1167 * CmdSN and issue a retry to plug the sequence.
1169 cmd->i_state = ISTATE_REMOVE;
1170 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1171 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1178 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1181 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1183 bool dump_payload = false;
1185 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1189 * Allocation iovecs needed for struct socket operations for
1190 * traditional iSCSI block I/O.
1192 if (iscsit_allocate_iovecs(cmd) < 0) {
1193 return iscsit_add_reject_from_cmd(
1194 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1197 immed_data = cmd->immediate_data;
1199 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1203 dump_payload = true;
1208 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1211 static u32 iscsit_do_crypto_hash_sg(
1212 struct hash_desc *hash,
1213 struct iscsi_cmd *cmd,
1221 struct scatterlist *sg;
1222 unsigned int page_off;
1224 crypto_hash_init(hash);
1226 sg = cmd->first_data_sg;
1227 page_off = cmd->first_data_sg_off;
1230 while (data_length) {
1231 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1233 crypto_hash_update(hash, &sg[i], cur_len);
1235 data_length -= cur_len;
1241 struct scatterlist pad_sg;
1243 sg_init_one(&pad_sg, pad_bytes, padding);
1244 crypto_hash_update(hash, &pad_sg, padding);
1246 crypto_hash_final(hash, (u8 *) &data_crc);
1251 static void iscsit_do_crypto_hash_buf(
1252 struct hash_desc *hash,
1259 struct scatterlist sg;
1261 crypto_hash_init(hash);
1263 sg_init_one(&sg, buf, payload_length);
1264 crypto_hash_update(hash, &sg, payload_length);
1267 sg_init_one(&sg, pad_bytes, padding);
1268 crypto_hash_update(hash, &sg, padding);
1270 crypto_hash_final(hash, data_crc);
1274 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1275 struct iscsi_cmd **out_cmd)
1277 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1278 struct iscsi_cmd *cmd = NULL;
1279 struct se_cmd *se_cmd;
1280 unsigned long flags;
1281 u32 payload_length = ntoh24(hdr->dlength);
1284 if (!payload_length) {
1285 pr_err("DataOUT payload is ZERO, protocol error.\n");
1286 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1291 spin_lock_bh(&conn->sess->session_stats_lock);
1292 conn->sess->rx_data_octets += payload_length;
1293 if (conn->sess->se_sess->se_node_acl) {
1294 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1295 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1296 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1298 spin_unlock_bh(&conn->sess->session_stats_lock);
1300 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1301 pr_err("DataSegmentLength: %u is greater than"
1302 " MaxXmitDataSegmentLength: %u\n", payload_length,
1303 conn->conn_ops->MaxXmitDataSegmentLength);
1304 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1308 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1313 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1314 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1315 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1316 payload_length, conn->cid);
1318 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1319 pr_err("Command ITT: 0x%08x received DataOUT after"
1320 " last DataOUT received, dumping payload\n",
1321 cmd->init_task_tag);
1322 return iscsit_dump_data_payload(conn, payload_length, 1);
1325 if (cmd->data_direction != DMA_TO_DEVICE) {
1326 pr_err("Command ITT: 0x%08x received DataOUT for a"
1327 " NON-WRITE command.\n", cmd->init_task_tag);
1328 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1331 se_cmd = &cmd->se_cmd;
1332 iscsit_mod_dataout_timer(cmd);
1334 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1335 pr_err("DataOut Offset: %u, Length %u greater than"
1336 " iSCSI Command EDTL %u, protocol error.\n",
1337 hdr->offset, payload_length, cmd->se_cmd.data_length);
1338 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1342 if (cmd->unsolicited_data) {
1343 int dump_unsolicited_data = 0;
1345 if (conn->sess->sess_ops->InitialR2T) {
1346 pr_err("Received unexpected unsolicited data"
1347 " while InitialR2T=Yes, protocol error.\n");
1348 transport_send_check_condition_and_sense(&cmd->se_cmd,
1349 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1353 * Special case for dealing with Unsolicited DataOUT
1354 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1358 /* Something's amiss if we're not in WRITE_PENDING state... */
1359 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1360 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1361 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1363 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1364 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1365 dump_unsolicited_data = 1;
1366 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1368 if (dump_unsolicited_data) {
1370 * Check if a delayed TASK_ABORTED status needs to
1371 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1372 * received with the unsolicitied data out.
1374 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1375 iscsit_stop_dataout_timer(cmd);
1377 transport_check_aborted_status(se_cmd,
1378 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1379 return iscsit_dump_data_payload(conn, payload_length, 1);
1383 * For the normal solicited data path:
1385 * Check for a delayed TASK_ABORTED status and dump any
1386 * incoming data out payload if one exists. Also, when the
1387 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1388 * data out sequence, we decrement outstanding_r2ts. Once
1389 * outstanding_r2ts reaches zero, go ahead and send the delayed
1390 * TASK_ABORTED status.
1392 if (se_cmd->transport_state & CMD_T_ABORTED) {
1393 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1394 if (--cmd->outstanding_r2ts < 1) {
1395 iscsit_stop_dataout_timer(cmd);
1396 transport_check_aborted_status(
1400 return iscsit_dump_data_payload(conn, payload_length, 1);
1404 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1405 * within-command recovery checks before receiving the payload.
1407 rc = iscsit_check_pre_dataout(cmd, buf);
1408 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1410 else if (rc == DATAOUT_CANNOT_RECOVER)
1416 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1419 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1420 struct iscsi_data *hdr)
1423 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1424 u32 payload_length = ntoh24(hdr->dlength);
1425 int iov_ret, data_crc_failed = 0;
1427 rx_size += payload_length;
1428 iov = &cmd->iov_data[0];
1430 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1435 iov_count += iov_ret;
1437 padding = ((-payload_length) & 3);
1439 iov[iov_count].iov_base = cmd->pad_bytes;
1440 iov[iov_count++].iov_len = padding;
1442 pr_debug("Receiving %u padding bytes.\n", padding);
1445 if (conn->conn_ops->DataDigest) {
1446 iov[iov_count].iov_base = &checksum;
1447 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1448 rx_size += ISCSI_CRC_LEN;
1451 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1453 iscsit_unmap_iovec(cmd);
1455 if (rx_got != rx_size)
1458 if (conn->conn_ops->DataDigest) {
1461 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1462 be32_to_cpu(hdr->offset),
1463 payload_length, padding,
1466 if (checksum != data_crc) {
1467 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1468 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1469 " does not match computed 0x%08x\n",
1470 hdr->itt, hdr->offset, payload_length,
1471 hdr->datasn, checksum, data_crc);
1472 data_crc_failed = 1;
1474 pr_debug("Got CRC32C DataDigest 0x%08x for"
1475 " %u bytes of Data Out\n", checksum,
1480 return data_crc_failed;
1484 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1485 bool data_crc_failed)
1487 struct iscsi_conn *conn = cmd->conn;
1490 * Increment post receive data and CRC values or perform
1491 * within-command recovery.
1493 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1494 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1496 else if (rc == DATAOUT_SEND_R2T) {
1497 iscsit_set_dataout_sequence_values(cmd);
1498 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1499 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1501 * Handle extra special case for out of order
1502 * Unsolicited Data Out.
1504 spin_lock_bh(&cmd->istate_lock);
1505 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1506 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1507 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1508 spin_unlock_bh(&cmd->istate_lock);
1510 iscsit_stop_dataout_timer(cmd);
1513 target_execute_cmd(&cmd->se_cmd);
1515 } else /* DATAOUT_CANNOT_RECOVER */
1520 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1522 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1524 struct iscsi_cmd *cmd;
1525 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1527 bool data_crc_failed = false;
1529 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1535 rc = iscsit_get_dataout(conn, cmd, hdr);
1539 data_crc_failed = true;
1541 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1544 int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1547 unsigned char *ping_data = NULL;
1548 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1549 u32 checksum, data_crc, padding = 0, payload_length;
1550 struct iscsi_cmd *cmd_p = NULL;
1551 struct kvec *iov = NULL;
1552 struct iscsi_nopout *hdr;
1554 hdr = (struct iscsi_nopout *) buf;
1555 payload_length = ntoh24(hdr->dlength);
1557 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1558 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1559 " not set, protocol error.\n");
1560 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1564 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1565 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1566 " greater than MaxXmitDataSegmentLength: %u, protocol"
1567 " error.\n", payload_length,
1568 conn->conn_ops->MaxXmitDataSegmentLength);
1569 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1573 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1574 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1575 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1576 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1579 * This is not a response to a Unsolicited NopIN, which means
1580 * it can either be a NOPOUT ping request (with a valid ITT),
1581 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1582 * Either way, make sure we allocate an struct iscsi_cmd, as both
1583 * can contain ping data.
1585 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1587 return iscsit_add_reject(
1588 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1591 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1592 cmd->i_state = ISTATE_SEND_NOPIN;
1593 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1595 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1596 cmd->targ_xfer_tag = 0xFFFFFFFF;
1597 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1598 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1599 cmd->data_direction = DMA_NONE;
1602 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1603 rx_size = payload_length;
1604 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1606 pr_err("Unable to allocate memory for"
1607 " NOPOUT ping data.\n");
1612 iov = &cmd->iov_misc[0];
1613 iov[niov].iov_base = ping_data;
1614 iov[niov++].iov_len = payload_length;
1616 padding = ((-payload_length) & 3);
1618 pr_debug("Receiving %u additional bytes"
1619 " for padding.\n", padding);
1620 iov[niov].iov_base = &cmd->pad_bytes;
1621 iov[niov++].iov_len = padding;
1624 if (conn->conn_ops->DataDigest) {
1625 iov[niov].iov_base = &checksum;
1626 iov[niov++].iov_len = ISCSI_CRC_LEN;
1627 rx_size += ISCSI_CRC_LEN;
1630 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1631 if (rx_got != rx_size) {
1636 if (conn->conn_ops->DataDigest) {
1637 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1638 ping_data, payload_length,
1639 padding, cmd->pad_bytes,
1642 if (checksum != data_crc) {
1643 pr_err("Ping data CRC32C DataDigest"
1644 " 0x%08x does not match computed 0x%08x\n",
1645 checksum, data_crc);
1646 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1647 pr_err("Unable to recover from"
1648 " NOPOUT Ping DataCRC failure while in"
1654 * Silently drop this PDU and let the
1655 * initiator plug the CmdSN gap.
1657 pr_debug("Dropping NOPOUT"
1658 " Command CmdSN: 0x%08x due to"
1659 " DataCRC error.\n", hdr->cmdsn);
1664 pr_debug("Got CRC32C DataDigest"
1665 " 0x%08x for %u bytes of ping data.\n",
1666 checksum, payload_length);
1670 ping_data[payload_length] = '\0';
1672 * Attach ping data to struct iscsi_cmd->buf_ptr.
1674 cmd->buf_ptr = ping_data;
1675 cmd->buf_ptr_size = payload_length;
1677 pr_debug("Got %u bytes of NOPOUT ping"
1678 " data.\n", payload_length);
1679 pr_debug("Ping Data: \"%s\"\n", ping_data);
1682 if (hdr->itt != RESERVED_ITT) {
1684 pr_err("Checking CmdSN for NOPOUT,"
1685 " but cmd is NULL!\n");
1689 * Initiator is expecting a NopIN ping reply,
1691 spin_lock_bh(&conn->cmd_lock);
1692 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1693 spin_unlock_bh(&conn->cmd_lock);
1695 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1697 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1698 iscsit_add_cmd_to_response_queue(cmd, conn,
1703 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1704 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1708 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1709 return iscsit_add_reject_from_cmd(
1710 ISCSI_REASON_PROTOCOL_ERROR,
1716 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1718 * This was a response to a unsolicited NOPIN ping.
1720 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1724 iscsit_stop_nopin_response_timer(conn);
1726 cmd_p->i_state = ISTATE_REMOVE;
1727 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1728 iscsit_start_nopin_timer(conn);
1731 * Initiator is not expecting a NOPIN is response.
1732 * Just ignore for now.
1734 * iSCSI v19-91 10.18
1735 * "A NOP-OUT may also be used to confirm a changed
1736 * ExpStatSN if another PDU will not be available
1746 iscsit_release_cmd(cmd);
1751 EXPORT_SYMBOL(iscsit_handle_nop_out);
1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1757 struct se_tmr_req *se_tmr;
1758 struct iscsi_tmr_req *tmr_req;
1759 struct iscsi_tm *hdr;
1760 int out_of_order_cmdsn = 0;
1764 hdr = (struct iscsi_tm *) buf;
1765 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1766 function = hdr->flags;
1768 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1769 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1770 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1771 hdr->rtt, hdr->refcmdsn, conn->cid);
1773 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1774 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1775 hdr->rtt != RESERVED_ITT)) {
1776 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1777 hdr->rtt = RESERVED_ITT;
1780 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1781 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1782 pr_err("Task Management Request TASK_REASSIGN not"
1783 " issued as immediate command, bad iSCSI Initiator"
1784 "implementation\n");
1785 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1788 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1789 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1790 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1792 cmd->data_direction = DMA_NONE;
1794 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1795 if (!cmd->tmr_req) {
1796 pr_err("Unable to allocate memory for"
1797 " Task Management command!\n");
1798 return iscsit_add_reject_from_cmd(
1799 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1804 * TASK_REASSIGN for ERL=2 / connection stays inside of
1805 * LIO-Target $FABRIC_MOD
1807 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1812 transport_init_se_cmd(&cmd->se_cmd,
1813 &lio_target_fabric_configfs->tf_ops,
1814 conn->sess->se_sess, 0, DMA_NONE,
1815 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1818 case ISCSI_TM_FUNC_ABORT_TASK:
1819 tcm_function = TMR_ABORT_TASK;
1821 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1822 tcm_function = TMR_ABORT_TASK_SET;
1824 case ISCSI_TM_FUNC_CLEAR_ACA:
1825 tcm_function = TMR_CLEAR_ACA;
1827 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1828 tcm_function = TMR_CLEAR_TASK_SET;
1830 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1831 tcm_function = TMR_LUN_RESET;
1833 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1834 tcm_function = TMR_TARGET_WARM_RESET;
1836 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1837 tcm_function = TMR_TARGET_COLD_RESET;
1840 pr_err("Unknown iSCSI TMR Function:"
1841 " 0x%02x\n", function);
1842 return iscsit_add_reject_from_cmd(
1843 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1847 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1848 tcm_function, GFP_KERNEL);
1850 return iscsit_add_reject_from_cmd(
1851 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1854 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1857 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1858 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1859 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1860 cmd->init_task_tag = hdr->itt;
1861 cmd->targ_xfer_tag = 0xFFFFFFFF;
1862 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1863 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1864 se_tmr = cmd->se_cmd.se_tmr_req;
1865 tmr_req = cmd->tmr_req;
1867 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1869 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1870 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1871 scsilun_to_int(&hdr->lun));
1873 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1879 case ISCSI_TM_FUNC_ABORT_TASK:
1880 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1881 if (se_tmr->response)
1884 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1885 case ISCSI_TM_FUNC_CLEAR_ACA:
1886 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1887 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1889 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1890 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1891 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1895 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1896 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1897 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1901 case ISCSI_TM_FUNC_TASK_REASSIGN:
1902 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1904 * Perform sanity checks on the ExpDataSN only if the
1905 * TASK_REASSIGN was successful.
1907 if (se_tmr->response)
1910 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1911 return iscsit_add_reject_from_cmd(
1912 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1916 pr_err("Unknown TMR function: 0x%02x, protocol"
1917 " error.\n", function);
1918 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1922 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1923 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1924 se_tmr->call_transport = 1;
1926 spin_lock_bh(&conn->cmd_lock);
1927 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1928 spin_unlock_bh(&conn->cmd_lock);
1930 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1931 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1932 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1933 out_of_order_cmdsn = 1;
1934 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1936 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1937 return iscsit_add_reject_from_cmd(
1938 ISCSI_REASON_PROTOCOL_ERROR,
1941 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1943 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1946 * Found the referenced task, send to transport for processing.
1948 if (se_tmr->call_transport)
1949 return transport_generic_handle_tmr(&cmd->se_cmd);
1952 * Could not find the referenced LUN, task, or Task Management
1953 * command not authorized or supported. Change state and
1954 * let the tx_thread send the response.
1956 * For connection recovery, this is also the default action for
1957 * TMR TASK_REASSIGN.
1959 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 static int iscsit_handle_text_cmd(
1966 struct iscsi_conn *conn,
1969 char *text_ptr, *text_in;
1970 int cmdsn_ret, niov = 0, rx_got, rx_size;
1971 u32 checksum = 0, data_crc = 0, payload_length;
1972 u32 padding = 0, pad_bytes = 0, text_length = 0;
1973 struct iscsi_cmd *cmd;
1975 struct iscsi_text *hdr;
1977 hdr = (struct iscsi_text *) buf;
1978 payload_length = ntoh24(hdr->dlength);
1980 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1981 pr_err("Unable to accept text parameter length: %u"
1982 "greater than MaxXmitDataSegmentLength %u.\n",
1983 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1984 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1988 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1989 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1990 hdr->exp_statsn, payload_length);
1992 rx_size = text_length = payload_length;
1994 text_in = kzalloc(text_length, GFP_KERNEL);
1996 pr_err("Unable to allocate memory for"
1997 " incoming text parameters\n");
2001 memset(iov, 0, 3 * sizeof(struct kvec));
2002 iov[niov].iov_base = text_in;
2003 iov[niov++].iov_len = text_length;
2005 padding = ((-payload_length) & 3);
2007 iov[niov].iov_base = &pad_bytes;
2008 iov[niov++].iov_len = padding;
2010 pr_debug("Receiving %u additional bytes"
2011 " for padding.\n", padding);
2013 if (conn->conn_ops->DataDigest) {
2014 iov[niov].iov_base = &checksum;
2015 iov[niov++].iov_len = ISCSI_CRC_LEN;
2016 rx_size += ISCSI_CRC_LEN;
2019 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2020 if (rx_got != rx_size) {
2025 if (conn->conn_ops->DataDigest) {
2026 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2027 text_in, text_length,
2028 padding, (u8 *)&pad_bytes,
2031 if (checksum != data_crc) {
2032 pr_err("Text data CRC32C DataDigest"
2033 " 0x%08x does not match computed"
2034 " 0x%08x\n", checksum, data_crc);
2035 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2036 pr_err("Unable to recover from"
2037 " Text Data digest failure while in"
2043 * Silently drop this PDU and let the
2044 * initiator plug the CmdSN gap.
2046 pr_debug("Dropping Text"
2047 " Command CmdSN: 0x%08x due to"
2048 " DataCRC error.\n", hdr->cmdsn);
2053 pr_debug("Got CRC32C DataDigest"
2054 " 0x%08x for %u bytes of text data.\n",
2055 checksum, text_length);
2058 text_in[text_length - 1] = '\0';
2059 pr_debug("Successfully read %d bytes of text"
2060 " data.\n", text_length);
2062 if (strncmp("SendTargets", text_in, 11) != 0) {
2063 pr_err("Received Text Data that is not"
2064 " SendTargets, cannot continue.\n");
2068 text_ptr = strchr(text_in, '=');
2070 pr_err("No \"=\" separator found in Text Data,"
2071 " cannot continue.\n");
2075 if (strncmp("=All", text_ptr, 4) != 0) {
2076 pr_err("Unable to locate All value for"
2077 " SendTargets key, cannot continue.\n");
2081 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2085 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2087 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2090 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2091 cmd->i_state = ISTATE_SEND_TEXTRSP;
2092 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2093 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2094 cmd->targ_xfer_tag = 0xFFFFFFFF;
2095 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2096 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2097 cmd->data_direction = DMA_NONE;
2099 spin_lock_bh(&conn->cmd_lock);
2100 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2101 spin_unlock_bh(&conn->cmd_lock);
2103 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2105 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2106 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2107 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2108 return iscsit_add_reject_from_cmd(
2109 ISCSI_REASON_PROTOCOL_ERROR,
2115 return iscsit_execute_cmd(cmd, 0);
2118 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2120 struct iscsi_conn *conn_p;
2121 struct iscsi_session *sess = conn->sess;
2123 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2124 " for SID: %u.\n", conn->cid, conn->sess->sid);
2126 atomic_set(&sess->session_logout, 1);
2127 atomic_set(&conn->conn_logout_remove, 1);
2128 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2130 iscsit_inc_conn_usage_count(conn);
2131 iscsit_inc_session_usage_count(sess);
2133 spin_lock_bh(&sess->conn_lock);
2134 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2135 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2138 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2139 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2141 spin_unlock_bh(&sess->conn_lock);
2143 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2148 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2150 struct iscsi_conn *l_conn;
2151 struct iscsi_session *sess = conn->sess;
2153 pr_debug("Received logout request CLOSECONNECTION for CID:"
2154 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2157 * A Logout Request with a CLOSECONNECTION reason code for a CID
2158 * can arrive on a connection with a differing CID.
2160 if (conn->cid == cmd->logout_cid) {
2161 spin_lock_bh(&conn->state_lock);
2162 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2163 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2165 atomic_set(&conn->conn_logout_remove, 1);
2166 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2167 iscsit_inc_conn_usage_count(conn);
2169 spin_unlock_bh(&conn->state_lock);
2172 * Handle all different cid CLOSECONNECTION requests in
2173 * iscsit_logout_post_handler_diffcid() as to give enough
2174 * time for any non immediate command's CmdSN to be
2175 * acknowledged on the connection in question.
2177 * Here we simply make sure the CID is still around.
2179 l_conn = iscsit_get_conn_from_cid(sess,
2182 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2183 iscsit_add_cmd_to_response_queue(cmd, conn,
2188 iscsit_dec_conn_usage_count(l_conn);
2191 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2196 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2198 struct iscsi_session *sess = conn->sess;
2200 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2201 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2203 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2204 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2205 " while ERL!=2.\n");
2206 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2207 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2211 if (conn->cid == cmd->logout_cid) {
2212 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2213 " with CID: %hu on CID: %hu, implementation error.\n",
2214 cmd->logout_cid, conn->cid);
2215 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2216 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2220 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2226 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2229 int cmdsn_ret, logout_remove = 0;
2231 struct iscsi_logout *hdr;
2232 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2234 hdr = (struct iscsi_logout *) buf;
2235 reason_code = (hdr->flags & 0x7f);
2238 spin_lock(&tiqn->logout_stats.lock);
2239 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2240 tiqn->logout_stats.normal_logouts++;
2242 tiqn->logout_stats.abnormal_logouts++;
2243 spin_unlock(&tiqn->logout_stats.lock);
2246 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2247 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2248 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2249 hdr->cid, conn->cid);
2251 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2252 pr_err("Received logout request on connection that"
2253 " is not in logged in state, ignoring request.\n");
2254 iscsit_release_cmd(cmd);
2258 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2259 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2260 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2261 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2262 cmd->targ_xfer_tag = 0xFFFFFFFF;
2263 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2264 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2265 cmd->logout_cid = be16_to_cpu(hdr->cid);
2266 cmd->logout_reason = reason_code;
2267 cmd->data_direction = DMA_NONE;
2270 * We need to sleep in these cases (by returning 1) until the Logout
2271 * Response gets sent in the tx thread.
2273 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2274 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2275 be16_to_cpu(hdr->cid) == conn->cid))
2278 spin_lock_bh(&conn->cmd_lock);
2279 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2280 spin_unlock_bh(&conn->cmd_lock);
2282 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2283 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2286 * Immediate commands are executed, well, immediately.
2287 * Non-Immediate Logout Commands are executed in CmdSN order.
2289 if (cmd->immediate_cmd) {
2290 int ret = iscsit_execute_cmd(cmd, 0);
2295 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2296 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2298 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2299 return iscsit_add_reject_from_cmd(
2300 ISCSI_REASON_PROTOCOL_ERROR,
2305 return logout_remove;
2307 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2309 static int iscsit_handle_snack(
2310 struct iscsi_conn *conn,
2313 struct iscsi_snack *hdr;
2315 hdr = (struct iscsi_snack *) buf;
2316 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2318 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2319 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2320 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2321 hdr->begrun, hdr->runlength, conn->cid);
2323 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2324 pr_err("Initiator sent SNACK request while in"
2325 " ErrorRecoveryLevel=0.\n");
2326 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2330 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2331 * call from inside iscsi_send_recovery_datain_or_r2t().
2333 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2335 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2337 be32_to_cpu(hdr->ttt),
2338 be32_to_cpu(hdr->begrun),
2339 be32_to_cpu(hdr->runlength));
2340 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2341 return iscsit_handle_status_snack(conn, hdr->itt,
2342 be32_to_cpu(hdr->ttt),
2343 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2344 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2345 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2346 be32_to_cpu(hdr->begrun),
2347 be32_to_cpu(hdr->runlength));
2348 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2349 /* FIXME: Support R-Data SNACK */
2350 pr_err("R-Data SNACK Not Supported.\n");
2351 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2354 pr_err("Unknown SNACK type 0x%02x, protocol"
2355 " error.\n", hdr->flags & 0x0f);
2356 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2363 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2365 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2366 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2367 wait_for_completion_interruptible_timeout(
2368 &conn->rx_half_close_comp,
2369 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2373 static int iscsit_handle_immediate_data(
2374 struct iscsi_cmd *cmd,
2375 struct iscsi_scsi_req *hdr,
2378 int iov_ret, rx_got = 0, rx_size = 0;
2379 u32 checksum, iov_count = 0, padding = 0;
2380 struct iscsi_conn *conn = cmd->conn;
2383 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2385 return IMMEDIATE_DATA_CANNOT_RECOVER;
2388 iov_count = iov_ret;
2389 iov = &cmd->iov_data[0];
2391 padding = ((-length) & 3);
2393 iov[iov_count].iov_base = cmd->pad_bytes;
2394 iov[iov_count++].iov_len = padding;
2398 if (conn->conn_ops->DataDigest) {
2399 iov[iov_count].iov_base = &checksum;
2400 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2401 rx_size += ISCSI_CRC_LEN;
2404 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2406 iscsit_unmap_iovec(cmd);
2408 if (rx_got != rx_size) {
2409 iscsit_rx_thread_wait_for_tcp(conn);
2410 return IMMEDIATE_DATA_CANNOT_RECOVER;
2413 if (conn->conn_ops->DataDigest) {
2416 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2417 cmd->write_data_done, length, padding,
2420 if (checksum != data_crc) {
2421 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2422 " does not match computed 0x%08x\n", checksum,
2425 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2426 pr_err("Unable to recover from"
2427 " Immediate Data digest failure while"
2429 iscsit_add_reject_from_cmd(
2430 ISCSI_REASON_DATA_DIGEST_ERROR,
2431 1, 0, (unsigned char *)hdr, cmd);
2432 return IMMEDIATE_DATA_CANNOT_RECOVER;
2434 iscsit_add_reject_from_cmd(
2435 ISCSI_REASON_DATA_DIGEST_ERROR,
2436 0, 0, (unsigned char *)hdr, cmd);
2437 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2440 pr_debug("Got CRC32C DataDigest 0x%08x for"
2441 " %u bytes of Immediate Data\n", checksum,
2446 cmd->write_data_done += length;
2448 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2449 spin_lock_bh(&cmd->istate_lock);
2450 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2451 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2452 spin_unlock_bh(&cmd->istate_lock);
2455 return IMMEDIATE_DATA_NORMAL_OPERATION;
2459 * Called with sess->conn_lock held.
2461 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2462 with active network interface */
2463 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2465 struct iscsi_cmd *cmd;
2466 struct iscsi_conn *conn_p;
2469 * Only send a Asynchronous Message on connections whos network
2470 * interface is still functional.
2472 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2473 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2474 iscsit_inc_conn_usage_count(conn_p);
2482 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2484 iscsit_dec_conn_usage_count(conn_p);
2488 cmd->logout_cid = conn->cid;
2489 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2490 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2492 spin_lock_bh(&conn_p->cmd_lock);
2493 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2494 spin_unlock_bh(&conn_p->cmd_lock);
2496 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2497 iscsit_dec_conn_usage_count(conn_p);
2500 static int iscsit_send_conn_drop_async_message(
2501 struct iscsi_cmd *cmd,
2502 struct iscsi_conn *conn)
2504 struct iscsi_async *hdr;
2506 cmd->tx_size = ISCSI_HDR_LEN;
2507 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2509 hdr = (struct iscsi_async *) cmd->pdu;
2510 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2511 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2512 cmd->init_task_tag = RESERVED_ITT;
2513 cmd->targ_xfer_tag = 0xFFFFFFFF;
2514 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2515 cmd->stat_sn = conn->stat_sn++;
2516 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2517 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2518 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2519 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2520 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2521 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2522 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2524 if (conn->conn_ops->HeaderDigest) {
2525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2527 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2528 (unsigned char *)hdr, ISCSI_HDR_LEN,
2529 0, NULL, (u8 *)header_digest);
2531 cmd->tx_size += ISCSI_CRC_LEN;
2532 pr_debug("Attaching CRC32C HeaderDigest to"
2533 " Async Message 0x%08x\n", *header_digest);
2536 cmd->iov_misc[0].iov_base = cmd->pdu;
2537 cmd->iov_misc[0].iov_len = cmd->tx_size;
2538 cmd->iov_misc_count = 1;
2540 pr_debug("Sending Connection Dropped Async Message StatSN:"
2541 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2542 cmd->logout_cid, conn->cid);
2546 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2548 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2549 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2550 wait_for_completion_interruptible_timeout(
2551 &conn->tx_half_close_comp,
2552 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2557 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2558 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2561 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2562 hdr->flags = datain->flags;
2563 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2564 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2565 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2566 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2567 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2568 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2569 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2572 hton24(hdr->dlength, datain->length);
2573 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2574 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2575 (struct scsi_lun *)&hdr->lun);
2577 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2579 hdr->itt = cmd->init_task_tag;
2581 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2582 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2584 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2586 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2588 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2590 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2591 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2592 hdr->datasn = cpu_to_be32(datain->data_sn);
2593 hdr->offset = cpu_to_be32(datain->offset);
2595 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2596 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2597 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2598 ntohl(hdr->offset), datain->length, conn->cid);
2601 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2603 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2604 struct iscsi_datain datain;
2605 struct iscsi_datain_req *dr;
2607 u32 iov_count = 0, tx_size = 0;
2608 int eodr = 0, ret, iov_ret;
2609 bool set_statsn = false;
2611 memset(&datain, 0, sizeof(struct iscsi_datain));
2612 dr = iscsit_get_datain_values(cmd, &datain);
2614 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2615 cmd->init_task_tag);
2619 * Be paranoid and double check the logic for now.
2621 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2622 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2623 " datain.length: %u exceeds cmd->data_length: %u\n",
2624 cmd->init_task_tag, datain.offset, datain.length,
2625 cmd->se_cmd.data_length);
2629 spin_lock_bh(&conn->sess->session_stats_lock);
2630 conn->sess->tx_data_octets += datain.length;
2631 if (conn->sess->se_sess->se_node_acl) {
2632 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2633 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2634 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2636 spin_unlock_bh(&conn->sess->session_stats_lock);
2638 * Special case for successfully execution w/ both DATAIN
2641 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2642 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2643 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2645 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2646 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2647 iscsit_increment_maxcmdsn(cmd, conn->sess);
2648 cmd->stat_sn = conn->stat_sn++;
2650 } else if (dr->dr_complete ==
2651 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2655 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2657 iov = &cmd->iov_data[0];
2658 iov[iov_count].iov_base = cmd->pdu;
2659 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2660 tx_size += ISCSI_HDR_LEN;
2662 if (conn->conn_ops->HeaderDigest) {
2663 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2665 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2666 (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
2667 0, NULL, (u8 *)header_digest);
2669 iov[0].iov_len += ISCSI_CRC_LEN;
2670 tx_size += ISCSI_CRC_LEN;
2672 pr_debug("Attaching CRC32 HeaderDigest"
2673 " for DataIN PDU 0x%08x\n", *header_digest);
2676 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2677 datain.offset, datain.length);
2681 iov_count += iov_ret;
2682 tx_size += datain.length;
2684 cmd->padding = ((-datain.length) & 3);
2686 iov[iov_count].iov_base = cmd->pad_bytes;
2687 iov[iov_count++].iov_len = cmd->padding;
2688 tx_size += cmd->padding;
2690 pr_debug("Attaching %u padding bytes\n",
2693 if (conn->conn_ops->DataDigest) {
2694 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2695 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2697 iov[iov_count].iov_base = &cmd->data_crc;
2698 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2699 tx_size += ISCSI_CRC_LEN;
2701 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2702 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2705 cmd->iov_data_count = iov_count;
2706 cmd->tx_size = tx_size;
2708 /* sendpage is preferred but can't insert markers */
2709 if (!conn->conn_ops->IFMarker)
2710 ret = iscsit_fe_sendpage_sg(cmd, conn);
2712 ret = iscsit_send_tx_data(cmd, conn, 0);
2714 iscsit_unmap_iovec(cmd);
2717 iscsit_tx_thread_wait_for_tcp(conn);
2721 if (dr->dr_complete) {
2722 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2724 iscsit_free_datain_req(cmd, dr);
2731 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2732 struct iscsi_logout_rsp *hdr)
2734 struct iscsi_conn *logout_conn = NULL;
2735 struct iscsi_conn_recovery *cr = NULL;
2736 struct iscsi_session *sess = conn->sess;
2738 * The actual shutting down of Sessions and/or Connections
2739 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2740 * is done in scsi_logout_post_handler().
2742 switch (cmd->logout_reason) {
2743 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2744 pr_debug("iSCSI session logout successful, setting"
2745 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2746 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2748 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2749 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2752 * For CLOSECONNECTION logout requests carrying
2753 * a matching logout CID -> local CID, the reference
2754 * for the local CID will have been incremented in
2755 * iscsi_logout_closeconnection().
2757 * For CLOSECONNECTION logout requests carrying
2758 * a different CID than the connection it arrived
2759 * on, the connection responding to cmd->logout_cid
2760 * is stopped in iscsit_logout_post_handler_diffcid().
2763 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2764 " successful.\n", cmd->logout_cid, conn->cid);
2765 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2767 case ISCSI_LOGOUT_REASON_RECOVERY:
2768 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2769 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2772 * If the connection is still active from our point of view
2773 * force connection recovery to occur.
2775 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2778 iscsit_connection_reinstatement_rcfr(logout_conn);
2779 iscsit_dec_conn_usage_count(logout_conn);
2782 cr = iscsit_get_inactive_connection_recovery_entry(
2783 conn->sess, cmd->logout_cid);
2785 pr_err("Unable to locate CID: %hu for"
2786 " REMOVECONNFORRECOVERY Logout Request.\n",
2788 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2792 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2794 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2795 " for recovery for CID: %hu on CID: %hu successful.\n",
2796 cmd->logout_cid, conn->cid);
2797 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2800 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2801 cmd->logout_reason);
2805 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2806 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2807 hdr->response = cmd->logout_response;
2808 hdr->itt = cmd->init_task_tag;
2809 cmd->stat_sn = conn->stat_sn++;
2810 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2812 iscsit_increment_maxcmdsn(cmd, conn->sess);
2813 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2814 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2816 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2817 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2818 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2819 cmd->logout_cid, conn->cid);
2823 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2826 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2829 int niov = 0, tx_size, rc;
2831 rc = iscsit_build_logout_rsp(cmd, conn,
2832 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2836 tx_size = ISCSI_HDR_LEN;
2837 iov = &cmd->iov_misc[0];
2838 iov[niov].iov_base = cmd->pdu;
2839 iov[niov++].iov_len = ISCSI_HDR_LEN;
2841 if (conn->conn_ops->HeaderDigest) {
2842 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2844 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2845 (unsigned char *)&cmd->pdu[0], ISCSI_HDR_LEN,
2846 0, NULL, (u8 *)header_digest);
2848 iov[0].iov_len += ISCSI_CRC_LEN;
2849 tx_size += ISCSI_CRC_LEN;
2850 pr_debug("Attaching CRC32C HeaderDigest to"
2851 " Logout Response 0x%08x\n", *header_digest);
2853 cmd->iov_misc_count = niov;
2854 cmd->tx_size = tx_size;
2860 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2861 struct iscsi_nopin *hdr, bool nopout_response)
2863 hdr->opcode = ISCSI_OP_NOOP_IN;
2864 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2865 hton24(hdr->dlength, cmd->buf_ptr_size);
2866 if (nopout_response)
2867 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2868 hdr->itt = cmd->init_task_tag;
2869 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2870 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2872 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2874 if (nopout_response)
2875 iscsit_increment_maxcmdsn(cmd, conn->sess);
2877 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2878 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2880 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2881 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2882 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2883 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2885 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2888 * Unsolicited NOPIN, either requesting a response or not.
2890 static int iscsit_send_unsolicited_nopin(
2891 struct iscsi_cmd *cmd,
2892 struct iscsi_conn *conn,
2895 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2896 int tx_size = ISCSI_HDR_LEN, ret;
2898 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2900 if (conn->conn_ops->HeaderDigest) {
2901 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2903 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2904 (unsigned char *)hdr, ISCSI_HDR_LEN,
2905 0, NULL, (u8 *)header_digest);
2907 tx_size += ISCSI_CRC_LEN;
2908 pr_debug("Attaching CRC32C HeaderDigest to"
2909 " NopIN 0x%08x\n", *header_digest);
2912 cmd->iov_misc[0].iov_base = cmd->pdu;
2913 cmd->iov_misc[0].iov_len = tx_size;
2914 cmd->iov_misc_count = 1;
2915 cmd->tx_size = tx_size;
2917 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2918 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2920 ret = iscsit_send_tx_data(cmd, conn, 1);
2922 iscsit_tx_thread_wait_for_tcp(conn);
2926 spin_lock_bh(&cmd->istate_lock);
2927 cmd->i_state = want_response ?
2928 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2929 spin_unlock_bh(&cmd->istate_lock);
2935 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2937 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2940 int niov = 0, tx_size;
2942 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2944 tx_size = ISCSI_HDR_LEN;
2945 iov = &cmd->iov_misc[0];
2946 iov[niov].iov_base = cmd->pdu;
2947 iov[niov++].iov_len = ISCSI_HDR_LEN;
2949 if (conn->conn_ops->HeaderDigest) {
2950 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2952 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2953 (unsigned char *)hdr, ISCSI_HDR_LEN,
2954 0, NULL, (u8 *)header_digest);
2956 iov[0].iov_len += ISCSI_CRC_LEN;
2957 tx_size += ISCSI_CRC_LEN;
2958 pr_debug("Attaching CRC32C HeaderDigest"
2959 " to NopIn 0x%08x\n", *header_digest);
2963 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2964 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2966 if (cmd->buf_ptr_size) {
2967 iov[niov].iov_base = cmd->buf_ptr;
2968 iov[niov++].iov_len = cmd->buf_ptr_size;
2969 tx_size += cmd->buf_ptr_size;
2971 pr_debug("Echoing back %u bytes of ping"
2972 " data.\n", cmd->buf_ptr_size);
2974 padding = ((-cmd->buf_ptr_size) & 3);
2976 iov[niov].iov_base = &cmd->pad_bytes;
2977 iov[niov++].iov_len = padding;
2979 pr_debug("Attaching %u additional"
2980 " padding bytes.\n", padding);
2982 if (conn->conn_ops->DataDigest) {
2983 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2984 cmd->buf_ptr, cmd->buf_ptr_size,
2985 padding, (u8 *)&cmd->pad_bytes,
2986 (u8 *)&cmd->data_crc);
2988 iov[niov].iov_base = &cmd->data_crc;
2989 iov[niov++].iov_len = ISCSI_CRC_LEN;
2990 tx_size += ISCSI_CRC_LEN;
2991 pr_debug("Attached DataDigest for %u"
2992 " bytes of ping data, CRC 0x%08x\n",
2993 cmd->buf_ptr_size, cmd->data_crc);
2997 cmd->iov_misc_count = niov;
2998 cmd->tx_size = tx_size;
3003 static int iscsit_send_r2t(
3004 struct iscsi_cmd *cmd,
3005 struct iscsi_conn *conn)
3008 struct iscsi_r2t *r2t;
3009 struct iscsi_r2t_rsp *hdr;
3012 r2t = iscsit_get_r2t_from_list(cmd);
3016 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3017 memset(hdr, 0, ISCSI_HDR_LEN);
3018 hdr->opcode = ISCSI_OP_R2T;
3019 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3020 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3021 (struct scsi_lun *)&hdr->lun);
3022 hdr->itt = cmd->init_task_tag;
3023 spin_lock_bh(&conn->sess->ttt_lock);
3024 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3025 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3026 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3027 spin_unlock_bh(&conn->sess->ttt_lock);
3028 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3029 hdr->statsn = cpu_to_be32(conn->stat_sn);
3030 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3031 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3032 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3033 hdr->data_offset = cpu_to_be32(r2t->offset);
3034 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3036 cmd->iov_misc[0].iov_base = cmd->pdu;
3037 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3038 tx_size += ISCSI_HDR_LEN;
3040 if (conn->conn_ops->HeaderDigest) {
3041 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3043 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3044 (unsigned char *)hdr, ISCSI_HDR_LEN,
3045 0, NULL, (u8 *)header_digest);
3047 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3048 tx_size += ISCSI_CRC_LEN;
3049 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3050 " PDU 0x%08x\n", *header_digest);
3053 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3054 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3055 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3056 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3057 r2t->offset, r2t->xfer_len, conn->cid);
3059 cmd->iov_misc_count = 1;
3060 cmd->tx_size = tx_size;
3062 spin_lock_bh(&cmd->r2t_lock);
3064 spin_unlock_bh(&cmd->r2t_lock);
3066 ret = iscsit_send_tx_data(cmd, conn, 1);
3068 iscsit_tx_thread_wait_for_tcp(conn);
3072 spin_lock_bh(&cmd->dataout_timeout_lock);
3073 iscsit_start_dataout_timer(cmd, conn);
3074 spin_unlock_bh(&cmd->dataout_timeout_lock);
3080 * @recovery: If called from iscsi_task_reassign_complete_write() for
3081 * connection recovery.
3083 int iscsit_build_r2ts_for_cmd(
3084 struct iscsi_conn *conn,
3085 struct iscsi_cmd *cmd,
3089 u32 offset = 0, xfer_len = 0;
3091 spin_lock_bh(&cmd->r2t_lock);
3092 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3093 spin_unlock_bh(&cmd->r2t_lock);
3097 if (conn->sess->sess_ops->DataSequenceInOrder &&
3099 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3101 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3102 if (conn->sess->sess_ops->DataSequenceInOrder) {
3103 offset = cmd->r2t_offset;
3105 if (first_r2t && recovery) {
3106 int new_data_end = offset +
3107 conn->sess->sess_ops->MaxBurstLength -
3108 cmd->next_burst_len;
3110 if (new_data_end > cmd->se_cmd.data_length)
3111 xfer_len = cmd->se_cmd.data_length - offset;
3114 conn->sess->sess_ops->MaxBurstLength -
3115 cmd->next_burst_len;
3117 int new_data_end = offset +
3118 conn->sess->sess_ops->MaxBurstLength;
3120 if (new_data_end > cmd->se_cmd.data_length)
3121 xfer_len = cmd->se_cmd.data_length - offset;
3123 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3125 cmd->r2t_offset += xfer_len;
3127 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3128 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3130 struct iscsi_seq *seq;
3132 seq = iscsit_get_seq_holder_for_r2t(cmd);
3134 spin_unlock_bh(&cmd->r2t_lock);
3138 offset = seq->offset;
3139 xfer_len = seq->xfer_len;
3141 if (cmd->seq_send_order == cmd->seq_count)
3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3144 cmd->outstanding_r2ts++;
3147 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3148 spin_unlock_bh(&cmd->r2t_lock);
3152 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3155 spin_unlock_bh(&cmd->r2t_lock);
3160 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3161 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3164 cmd->stat_sn = conn->stat_sn++;
3166 spin_lock_bh(&conn->sess->session_stats_lock);
3167 conn->sess->rsp_pdus++;
3168 spin_unlock_bh(&conn->sess->session_stats_lock);
3170 memset(hdr, 0, ISCSI_HDR_LEN);
3171 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3172 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3173 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3174 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3175 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3176 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3177 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3178 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3180 hdr->response = cmd->iscsi_response;
3181 hdr->cmd_status = cmd->se_cmd.scsi_status;
3182 hdr->itt = cmd->init_task_tag;
3183 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3185 iscsit_increment_maxcmdsn(cmd, conn->sess);
3186 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3187 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3189 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3190 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3191 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3192 cmd->se_cmd.scsi_status, conn->cid);
3194 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3196 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3198 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3200 u32 padding = 0, tx_size = 0;
3202 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3204 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3206 iov = &cmd->iov_misc[0];
3207 iov[iov_count].iov_base = cmd->pdu;
3208 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3209 tx_size += ISCSI_HDR_LEN;
3212 * Attach SENSE DATA payload to iSCSI Response PDU
3214 if (cmd->se_cmd.sense_buffer &&
3215 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3216 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3217 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3218 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3220 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3221 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3222 iov[iov_count].iov_base = cmd->sense_buffer;
3223 iov[iov_count++].iov_len =
3224 (cmd->se_cmd.scsi_sense_length + padding);
3225 tx_size += cmd->se_cmd.scsi_sense_length;
3228 memset(cmd->sense_buffer +
3229 cmd->se_cmd.scsi_sense_length, 0, padding);
3231 pr_debug("Adding %u bytes of padding to"
3232 " SENSE.\n", padding);
3235 if (conn->conn_ops->DataDigest) {
3236 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3238 (cmd->se_cmd.scsi_sense_length + padding),
3239 0, NULL, (u8 *)&cmd->data_crc);
3241 iov[iov_count].iov_base = &cmd->data_crc;
3242 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3243 tx_size += ISCSI_CRC_LEN;
3245 pr_debug("Attaching CRC32 DataDigest for"
3246 " SENSE, %u bytes CRC 0x%08x\n",
3247 (cmd->se_cmd.scsi_sense_length + padding),
3251 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3253 cmd->se_cmd.scsi_sense_length);
3256 if (conn->conn_ops->HeaderDigest) {
3257 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3259 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3260 (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
3261 0, NULL, (u8 *)header_digest);
3263 iov[0].iov_len += ISCSI_CRC_LEN;
3264 tx_size += ISCSI_CRC_LEN;
3265 pr_debug("Attaching CRC32 HeaderDigest for Response"
3266 " PDU 0x%08x\n", *header_digest);
3269 cmd->iov_misc_count = iov_count;
3270 cmd->tx_size = tx_size;
3275 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3277 switch (se_tmr->response) {
3278 case TMR_FUNCTION_COMPLETE:
3279 return ISCSI_TMF_RSP_COMPLETE;
3280 case TMR_TASK_DOES_NOT_EXIST:
3281 return ISCSI_TMF_RSP_NO_TASK;
3282 case TMR_LUN_DOES_NOT_EXIST:
3283 return ISCSI_TMF_RSP_NO_LUN;
3284 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3285 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3286 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3287 return ISCSI_TMF_RSP_AUTH_FAILED;
3288 case TMR_FUNCTION_REJECTED:
3290 return ISCSI_TMF_RSP_REJECTED;
3295 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3296 struct iscsi_tm_rsp *hdr)
3298 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3300 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3301 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3302 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3303 hdr->itt = cmd->init_task_tag;
3304 cmd->stat_sn = conn->stat_sn++;
3305 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3307 iscsit_increment_maxcmdsn(cmd, conn->sess);
3308 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3309 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3311 pr_debug("Built Task Management Response ITT: 0x%08x,"
3312 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3313 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3315 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3318 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3320 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3323 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3325 cmd->iov_misc[0].iov_base = cmd->pdu;
3326 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3327 tx_size += ISCSI_HDR_LEN;
3329 if (conn->conn_ops->HeaderDigest) {
3330 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3332 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3333 (unsigned char *)hdr, ISCSI_HDR_LEN,
3334 0, NULL, (u8 *)header_digest);
3336 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3337 tx_size += ISCSI_CRC_LEN;
3338 pr_debug("Attaching CRC32 HeaderDigest for Task"
3339 " Mgmt Response PDU 0x%08x\n", *header_digest);
3342 cmd->iov_misc_count = 1;
3343 cmd->tx_size = tx_size;
3348 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3352 if (np->np_sockaddr.ss_family == AF_INET6) {
3353 const struct sockaddr_in6 sin6 = {
3354 .sin6_addr = IN6ADDR_ANY_INIT };
3355 struct sockaddr_in6 *sock_in6 =
3356 (struct sockaddr_in6 *)&np->np_sockaddr;
3358 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3359 sin6.sin6_addr.s6_addr, 16))
3362 struct sockaddr_in * sock_in =
3363 (struct sockaddr_in *)&np->np_sockaddr;
3365 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3372 #define SENDTARGETS_BUF_LIMIT 32768U
3374 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3376 char *payload = NULL;
3377 struct iscsi_conn *conn = cmd->conn;
3378 struct iscsi_portal_group *tpg;
3379 struct iscsi_tiqn *tiqn;
3380 struct iscsi_tpg_np *tpg_np;
3381 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3382 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3384 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3385 SENDTARGETS_BUF_LIMIT);
3387 payload = kzalloc(buffer_len, GFP_KERNEL);
3389 pr_err("Unable to allocate memory for sendtargets"
3394 spin_lock(&tiqn_lock);
3395 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3396 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3399 if ((len + payload_len) > buffer_len) {
3403 memcpy(payload + payload_len, buf, len);
3406 spin_lock(&tiqn->tiqn_tpg_lock);
3407 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3409 spin_lock(&tpg->tpg_state_lock);
3410 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3411 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3412 spin_unlock(&tpg->tpg_state_lock);
3415 spin_unlock(&tpg->tpg_state_lock);
3417 spin_lock(&tpg->tpg_np_lock);
3418 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3420 struct iscsi_np *np = tpg_np->tpg_np;
3421 bool inaddr_any = iscsit_check_inaddr_any(np);
3423 len = sprintf(buf, "TargetAddress="
3425 (np->np_sockaddr.ss_family == AF_INET6) ?
3426 "[" : "", (inaddr_any == false) ?
3427 np->np_ip : conn->local_ip,
3428 (np->np_sockaddr.ss_family == AF_INET6) ?
3429 "]" : "", (inaddr_any == false) ?
3430 np->np_port : conn->local_port,
3434 if ((len + payload_len) > buffer_len) {
3435 spin_unlock(&tpg->tpg_np_lock);
3436 spin_unlock(&tiqn->tiqn_tpg_lock);
3440 memcpy(payload + payload_len, buf, len);
3443 spin_unlock(&tpg->tpg_np_lock);
3445 spin_unlock(&tiqn->tiqn_tpg_lock);
3450 spin_unlock(&tiqn_lock);
3452 cmd->buf_ptr = payload;
3458 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3459 * MaxRecvDataSegmentLength.
3461 static int iscsit_send_text_rsp(
3462 struct iscsi_cmd *cmd,
3463 struct iscsi_conn *conn)
3465 struct iscsi_text_rsp *hdr;
3467 u32 padding = 0, tx_size = 0;
3468 int text_length, iov_count = 0;
3470 text_length = iscsit_build_sendtargets_response(cmd);
3471 if (text_length < 0)
3474 padding = ((-text_length) & 3);
3476 memset(cmd->buf_ptr + text_length, 0, padding);
3477 pr_debug("Attaching %u additional bytes for"
3478 " padding.\n", padding);
3481 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3482 memset(hdr, 0, ISCSI_HDR_LEN);
3483 hdr->opcode = ISCSI_OP_TEXT_RSP;
3484 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3485 hton24(hdr->dlength, text_length);
3486 hdr->itt = cmd->init_task_tag;
3487 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3488 cmd->stat_sn = conn->stat_sn++;
3489 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3491 iscsit_increment_maxcmdsn(cmd, conn->sess);
3492 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3493 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3495 iov = &cmd->iov_misc[0];
3497 iov[iov_count].iov_base = cmd->pdu;
3498 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3499 iov[iov_count].iov_base = cmd->buf_ptr;
3500 iov[iov_count++].iov_len = text_length + padding;
3502 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3504 if (conn->conn_ops->HeaderDigest) {
3505 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3507 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3508 (unsigned char *)hdr, ISCSI_HDR_LEN,
3509 0, NULL, (u8 *)header_digest);
3511 iov[0].iov_len += ISCSI_CRC_LEN;
3512 tx_size += ISCSI_CRC_LEN;
3513 pr_debug("Attaching CRC32 HeaderDigest for"
3514 " Text Response PDU 0x%08x\n", *header_digest);
3517 if (conn->conn_ops->DataDigest) {
3518 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3519 cmd->buf_ptr, (text_length + padding),
3520 0, NULL, (u8 *)&cmd->data_crc);
3522 iov[iov_count].iov_base = &cmd->data_crc;
3523 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3524 tx_size += ISCSI_CRC_LEN;
3526 pr_debug("Attaching DataDigest for %u bytes of text"
3527 " data, CRC 0x%08x\n", (text_length + padding),
3531 cmd->iov_misc_count = iov_count;
3532 cmd->tx_size = tx_size;
3534 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3535 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3536 text_length, conn->cid);
3541 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3542 struct iscsi_reject *hdr)
3544 hdr->opcode = ISCSI_OP_REJECT;
3545 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3546 hton24(hdr->dlength, ISCSI_HDR_LEN);
3547 hdr->ffffffff = cpu_to_be32(0xffffffff);
3548 cmd->stat_sn = conn->stat_sn++;
3549 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3550 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3551 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3554 EXPORT_SYMBOL(iscsit_build_reject);
3556 static int iscsit_send_reject(
3557 struct iscsi_cmd *cmd,
3558 struct iscsi_conn *conn)
3560 u32 iov_count = 0, tx_size = 0;
3561 struct iscsi_reject *hdr;
3564 iscsit_build_reject(cmd, conn, (struct iscsi_reject *)&cmd->pdu[0]);
3566 iov = &cmd->iov_misc[0];
3567 iov[iov_count].iov_base = cmd->pdu;
3568 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3569 iov[iov_count].iov_base = cmd->buf_ptr;
3570 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3572 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3574 if (conn->conn_ops->HeaderDigest) {
3575 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3577 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3578 (unsigned char *)hdr, ISCSI_HDR_LEN,
3579 0, NULL, (u8 *)header_digest);
3581 iov[0].iov_len += ISCSI_CRC_LEN;
3582 tx_size += ISCSI_CRC_LEN;
3583 pr_debug("Attaching CRC32 HeaderDigest for"
3584 " REJECT PDU 0x%08x\n", *header_digest);
3587 if (conn->conn_ops->DataDigest) {
3588 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3589 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3590 0, NULL, (u8 *)&cmd->data_crc);
3592 iov[iov_count].iov_base = &cmd->data_crc;
3593 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3594 tx_size += ISCSI_CRC_LEN;
3595 pr_debug("Attaching CRC32 DataDigest for REJECT"
3596 " PDU 0x%08x\n", cmd->data_crc);
3599 cmd->iov_misc_count = iov_count;
3600 cmd->tx_size = tx_size;
3602 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3603 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3608 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3610 struct iscsi_thread_set *ts = conn->thread_set;
3613 * thread_id is assigned from iscsit_global->ts_bitmap from
3614 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3616 * Here we use thread_id to determine which CPU that this
3617 * iSCSI connection's iscsi_thread_set will be scheduled to
3620 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3621 for_each_online_cpu(cpu) {
3623 cpumask_set_cpu(cpu, conn->conn_cpumask);
3628 * This should never be reached..
3631 cpumask_setall(conn->conn_cpumask);
3634 static inline void iscsit_thread_check_cpumask(
3635 struct iscsi_conn *conn,
3636 struct task_struct *p,
3641 * mode == 1 signals iscsi_target_tx_thread() usage.
3642 * mode == 0 signals iscsi_target_rx_thread() usage.
3645 if (!conn->conn_tx_reset_cpumask)
3647 conn->conn_tx_reset_cpumask = 0;
3649 if (!conn->conn_rx_reset_cpumask)
3651 conn->conn_rx_reset_cpumask = 0;
3654 * Update the CPU mask for this single kthread so that
3655 * both TX and RX kthreads are scheduled to run on the
3658 memset(buf, 0, 128);
3659 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3660 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3664 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3669 case ISTATE_SEND_R2T:
3670 ret = iscsit_send_r2t(cmd, conn);
3675 spin_lock_bh(&conn->cmd_lock);
3676 list_del(&cmd->i_conn_node);
3677 spin_unlock_bh(&conn->cmd_lock);
3679 iscsit_free_cmd(cmd);
3681 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3682 iscsit_mod_nopin_response_timer(conn);
3683 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3687 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3688 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3693 pr_err("Unknown Opcode: 0x%02x ITT:"
3694 " 0x%08x, i_state: %d on CID: %hu\n",
3695 cmd->iscsi_opcode, cmd->init_task_tag, state,
3707 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3709 struct iscsit_transport *t = conn->conn_transport;
3710 struct iscsi_queue_req *qr;
3711 struct iscsi_cmd *cmd;
3715 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3716 atomic_set(&conn->check_immediate_queue, 0);
3719 kmem_cache_free(lio_qr_cache, qr);
3721 ret = t->iscsit_immediate_queue(conn, cmd, state);
3730 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3736 case ISTATE_SEND_DATAIN:
3737 ret = iscsit_send_datain(cmd, conn);
3742 goto check_rsp_state;
3743 else if (ret == 1) {
3745 spin_lock_bh(&cmd->istate_lock);
3746 cmd->i_state = ISTATE_SENT_STATUS;
3747 spin_unlock_bh(&cmd->istate_lock);
3749 if (atomic_read(&conn->check_immediate_queue))
3753 } else if (ret == 2) {
3754 /* Still must send status,
3755 SCF_TRANSPORT_TASK_SENSE was set */
3756 spin_lock_bh(&cmd->istate_lock);
3757 cmd->i_state = ISTATE_SEND_STATUS;
3758 spin_unlock_bh(&cmd->istate_lock);
3759 state = ISTATE_SEND_STATUS;
3760 goto check_rsp_state;
3764 case ISTATE_SEND_STATUS:
3765 case ISTATE_SEND_STATUS_RECOVERY:
3766 ret = iscsit_send_response(cmd, conn);
3768 case ISTATE_SEND_LOGOUTRSP:
3769 ret = iscsit_send_logout(cmd, conn);
3771 case ISTATE_SEND_ASYNCMSG:
3772 ret = iscsit_send_conn_drop_async_message(
3775 case ISTATE_SEND_NOPIN:
3776 ret = iscsit_send_nopin(cmd, conn);
3778 case ISTATE_SEND_REJECT:
3779 ret = iscsit_send_reject(cmd, conn);
3781 case ISTATE_SEND_TASKMGTRSP:
3782 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3785 ret = iscsit_tmr_post_handler(cmd, conn);
3787 iscsit_fall_back_to_erl0(conn->sess);
3789 case ISTATE_SEND_TEXTRSP:
3790 ret = iscsit_send_text_rsp(cmd, conn);
3793 pr_err("Unknown Opcode: 0x%02x ITT:"
3794 " 0x%08x, i_state: %d on CID: %hu\n",
3795 cmd->iscsi_opcode, cmd->init_task_tag,
3802 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3803 iscsit_tx_thread_wait_for_tcp(conn);
3804 iscsit_unmap_iovec(cmd);
3807 iscsit_unmap_iovec(cmd);
3810 case ISTATE_SEND_LOGOUTRSP:
3811 if (!iscsit_logout_post_handler(cmd, conn))
3814 case ISTATE_SEND_STATUS:
3815 case ISTATE_SEND_ASYNCMSG:
3816 case ISTATE_SEND_NOPIN:
3817 case ISTATE_SEND_STATUS_RECOVERY:
3818 case ISTATE_SEND_TEXTRSP:
3819 case ISTATE_SEND_TASKMGTRSP:
3820 spin_lock_bh(&cmd->istate_lock);
3821 cmd->i_state = ISTATE_SENT_STATUS;
3822 spin_unlock_bh(&cmd->istate_lock);
3824 case ISTATE_SEND_REJECT:
3825 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3826 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3827 complete(&cmd->reject_comp);
3830 complete(&cmd->reject_comp);
3833 pr_err("Unknown Opcode: 0x%02x ITT:"
3834 " 0x%08x, i_state: %d on CID: %hu\n",
3835 cmd->iscsi_opcode, cmd->init_task_tag,
3836 cmd->i_state, conn->cid);
3840 if (atomic_read(&conn->check_immediate_queue))
3851 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3853 struct iscsit_transport *t = conn->conn_transport;
3854 struct iscsi_queue_req *qr;
3855 struct iscsi_cmd *cmd;
3859 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3862 kmem_cache_free(lio_qr_cache, qr);
3864 ret = t->iscsit_response_queue(conn, cmd, state);
3865 if (ret == 1 || ret < 0)
3872 int iscsi_target_tx_thread(void *arg)
3875 struct iscsi_conn *conn;
3876 struct iscsi_thread_set *ts = arg;
3878 * Allow ourselves to be interrupted by SIGINT so that a
3879 * connection recovery / failure event can be triggered externally.
3881 allow_signal(SIGINT);
3884 conn = iscsi_tx_thread_pre_handler(ts);
3890 while (!kthread_should_stop()) {
3892 * Ensure that both TX and RX per connection kthreads
3893 * are scheduled to run on the same CPU.
3895 iscsit_thread_check_cpumask(conn, current, 1);
3897 wait_event_interruptible(conn->queues_wq,
3898 !iscsit_conn_all_queues_empty(conn) ||
3899 ts->status == ISCSI_THREAD_SET_RESET);
3901 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3902 signal_pending(current))
3906 ret = iscsit_handle_immediate_queue(conn);
3910 ret = iscsit_handle_response_queue(conn);
3913 else if (ret == -EAGAIN)
3920 iscsit_take_action_for_connection_exit(conn);
3926 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3928 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3929 struct iscsi_cmd *cmd;
3932 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3933 case ISCSI_OP_SCSI_CMD:
3934 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3936 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3939 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3941 case ISCSI_OP_SCSI_DATA_OUT:
3942 ret = iscsit_handle_data_out(conn, buf);
3944 case ISCSI_OP_NOOP_OUT:
3946 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3947 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3949 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3952 ret = iscsit_handle_nop_out(conn, cmd, buf);
3954 case ISCSI_OP_SCSI_TMFUNC:
3955 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3957 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3960 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3963 ret = iscsit_handle_text_cmd(conn, buf);
3965 case ISCSI_OP_LOGOUT:
3966 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3968 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3971 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3973 wait_for_completion_timeout(&conn->conn_logout_comp,
3974 SECONDS_FOR_LOGOUT_COMP * HZ);
3976 case ISCSI_OP_SNACK:
3977 ret = iscsit_handle_snack(conn, buf);
3980 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3981 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3982 pr_err("Cannot recover from unknown"
3983 " opcode while ERL=0, closing iSCSI connection.\n");
3986 if (!conn->conn_ops->OFMarker) {
3987 pr_err("Unable to recover from unknown"
3988 " opcode while OFMarker=No, closing iSCSI"
3992 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3993 pr_err("Unable to recover from unknown"
3994 " opcode, closing iSCSI connection.\n");
4003 int iscsi_target_rx_thread(void *arg)
4006 u8 buffer[ISCSI_HDR_LEN], opcode;
4007 u32 checksum = 0, digest = 0;
4008 struct iscsi_conn *conn = NULL;
4009 struct iscsi_thread_set *ts = arg;
4012 * Allow ourselves to be interrupted by SIGINT so that a
4013 * connection recovery / failure event can be triggered externally.
4015 allow_signal(SIGINT);
4018 conn = iscsi_rx_thread_pre_handler(ts);
4022 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4023 struct completion comp;
4026 init_completion(&comp);
4027 rc = wait_for_completion_interruptible(&comp);
4034 while (!kthread_should_stop()) {
4036 * Ensure that both TX and RX per connection kthreads
4037 * are scheduled to run on the same CPU.
4039 iscsit_thread_check_cpumask(conn, current, 0);
4041 memset(buffer, 0, ISCSI_HDR_LEN);
4042 memset(&iov, 0, sizeof(struct kvec));
4044 iov.iov_base = buffer;
4045 iov.iov_len = ISCSI_HDR_LEN;
4047 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4048 if (ret != ISCSI_HDR_LEN) {
4049 iscsit_rx_thread_wait_for_tcp(conn);
4054 * Set conn->bad_hdr for use with REJECT PDUs.
4056 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4058 if (conn->conn_ops->HeaderDigest) {
4059 iov.iov_base = &digest;
4060 iov.iov_len = ISCSI_CRC_LEN;
4062 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4063 if (ret != ISCSI_CRC_LEN) {
4064 iscsit_rx_thread_wait_for_tcp(conn);
4068 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4069 buffer, ISCSI_HDR_LEN,
4070 0, NULL, (u8 *)&checksum);
4072 if (digest != checksum) {
4073 pr_err("HeaderDigest CRC32C failed,"
4074 " received 0x%08x, computed 0x%08x\n",
4077 * Set the PDU to 0xff so it will intentionally
4078 * hit default in the switch below.
4080 memset(buffer, 0xff, ISCSI_HDR_LEN);
4081 spin_lock_bh(&conn->sess->session_stats_lock);
4082 conn->sess->conn_digest_errors++;
4083 spin_unlock_bh(&conn->sess->session_stats_lock);
4085 pr_debug("Got HeaderDigest CRC32C"
4086 " 0x%08x\n", checksum);
4090 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4093 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4095 if (conn->sess->sess_ops->SessionType &&
4096 ((!(opcode & ISCSI_OP_TEXT)) ||
4097 (!(opcode & ISCSI_OP_LOGOUT)))) {
4098 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4099 " while in Discovery Session, rejecting.\n", opcode);
4100 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
4105 ret = iscsi_target_rx_opcode(conn, buffer);
4111 if (!signal_pending(current))
4112 atomic_set(&conn->transport_failed, 1);
4113 iscsit_take_action_for_connection_exit(conn);
4119 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4121 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4122 struct iscsi_session *sess = conn->sess;
4124 * We expect this function to only ever be called from either RX or TX
4125 * thread context via iscsit_close_connection() once the other context
4126 * has been reset -> returned sleeping pre-handler state.
4128 spin_lock_bh(&conn->cmd_lock);
4129 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4131 list_del(&cmd->i_conn_node);
4132 spin_unlock_bh(&conn->cmd_lock);
4134 iscsit_increment_maxcmdsn(cmd, sess);
4136 iscsit_free_cmd(cmd);
4138 spin_lock_bh(&conn->cmd_lock);
4140 spin_unlock_bh(&conn->cmd_lock);
4143 static void iscsit_stop_timers_for_cmds(
4144 struct iscsi_conn *conn)
4146 struct iscsi_cmd *cmd;
4148 spin_lock_bh(&conn->cmd_lock);
4149 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4150 if (cmd->data_direction == DMA_TO_DEVICE)
4151 iscsit_stop_dataout_timer(cmd);
4153 spin_unlock_bh(&conn->cmd_lock);
4156 int iscsit_close_connection(
4157 struct iscsi_conn *conn)
4159 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4160 struct iscsi_session *sess = conn->sess;
4162 pr_debug("Closing iSCSI connection CID %hu on SID:"
4163 " %u\n", conn->cid, sess->sid);
4165 * Always up conn_logout_comp just in case the RX Thread is sleeping
4166 * and the logout response never got sent because the connection
4169 complete(&conn->conn_logout_comp);
4171 iscsi_release_thread_set(conn);
4173 iscsit_stop_timers_for_cmds(conn);
4174 iscsit_stop_nopin_response_timer(conn);
4175 iscsit_stop_nopin_timer(conn);
4176 iscsit_free_queue_reqs_for_conn(conn);
4179 * During Connection recovery drop unacknowledged out of order
4180 * commands for this connection, and prepare the other commands
4183 * During normal operation clear the out of order commands (but
4184 * do not free the struct iscsi_ooo_cmdsn's) and release all
4185 * struct iscsi_cmds.
4187 if (atomic_read(&conn->connection_recovery)) {
4188 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4189 iscsit_prepare_cmds_for_realligance(conn);
4191 iscsit_clear_ooo_cmdsns_for_conn(conn);
4192 iscsit_release_commands_from_conn(conn);
4196 * Handle decrementing session or connection usage count if
4197 * a logout response was not able to be sent because the
4198 * connection failed. Fall back to Session Recovery here.
4200 if (atomic_read(&conn->conn_logout_remove)) {
4201 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4202 iscsit_dec_conn_usage_count(conn);
4203 iscsit_dec_session_usage_count(sess);
4205 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4206 iscsit_dec_conn_usage_count(conn);
4208 atomic_set(&conn->conn_logout_remove, 0);
4209 atomic_set(&sess->session_reinstatement, 0);
4210 atomic_set(&sess->session_fall_back_to_erl0, 1);
4213 spin_lock_bh(&sess->conn_lock);
4214 list_del(&conn->conn_list);
4217 * Attempt to let the Initiator know this connection failed by
4218 * sending an Connection Dropped Async Message on another
4219 * active connection.
4221 if (atomic_read(&conn->connection_recovery))
4222 iscsit_build_conn_drop_async_message(conn);
4224 spin_unlock_bh(&sess->conn_lock);
4227 * If connection reinstatement is being performed on this connection,
4228 * up the connection reinstatement semaphore that is being blocked on
4229 * in iscsit_cause_connection_reinstatement().
4231 spin_lock_bh(&conn->state_lock);
4232 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4233 spin_unlock_bh(&conn->state_lock);
4234 complete(&conn->conn_wait_comp);
4235 wait_for_completion(&conn->conn_post_wait_comp);
4236 spin_lock_bh(&conn->state_lock);
4240 * If connection reinstatement is being performed on this connection
4241 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4242 * connection wait rcfr semaphore that is being blocked on
4243 * an iscsit_connection_reinstatement_rcfr().
4245 if (atomic_read(&conn->connection_wait_rcfr)) {
4246 spin_unlock_bh(&conn->state_lock);
4247 complete(&conn->conn_wait_rcfr_comp);
4248 wait_for_completion(&conn->conn_post_wait_comp);
4249 spin_lock_bh(&conn->state_lock);
4251 atomic_set(&conn->connection_reinstatement, 1);
4252 spin_unlock_bh(&conn->state_lock);
4255 * If any other processes are accessing this connection pointer we
4256 * must wait until they have completed.
4258 iscsit_check_conn_usage_count(conn);
4260 if (conn->conn_rx_hash.tfm)
4261 crypto_free_hash(conn->conn_rx_hash.tfm);
4262 if (conn->conn_tx_hash.tfm)
4263 crypto_free_hash(conn->conn_tx_hash.tfm);
4265 if (conn->conn_cpumask)
4266 free_cpumask_var(conn->conn_cpumask);
4268 kfree(conn->conn_ops);
4269 conn->conn_ops = NULL;
4272 sock_release(conn->sock);
4274 if (conn->conn_transport->iscsit_free_conn)
4275 conn->conn_transport->iscsit_free_conn(conn);
4277 iscsit_put_transport(conn->conn_transport);
4279 conn->thread_set = NULL;
4281 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4282 conn->conn_state = TARG_CONN_STATE_FREE;
4285 spin_lock_bh(&sess->conn_lock);
4286 atomic_dec(&sess->nconn);
4287 pr_debug("Decremented iSCSI connection count to %hu from node:"
4288 " %s\n", atomic_read(&sess->nconn),
4289 sess->sess_ops->InitiatorName);
4291 * Make sure that if one connection fails in an non ERL=2 iSCSI
4292 * Session that they all fail.
4294 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4295 !atomic_read(&sess->session_logout))
4296 atomic_set(&sess->session_fall_back_to_erl0, 1);
4299 * If this was not the last connection in the session, and we are
4300 * performing session reinstatement or falling back to ERL=0, call
4301 * iscsit_stop_session() without sleeping to shutdown the other
4302 * active connections.
4304 if (atomic_read(&sess->nconn)) {
4305 if (!atomic_read(&sess->session_reinstatement) &&
4306 !atomic_read(&sess->session_fall_back_to_erl0)) {
4307 spin_unlock_bh(&sess->conn_lock);
4310 if (!atomic_read(&sess->session_stop_active)) {
4311 atomic_set(&sess->session_stop_active, 1);
4312 spin_unlock_bh(&sess->conn_lock);
4313 iscsit_stop_session(sess, 0, 0);
4316 spin_unlock_bh(&sess->conn_lock);
4321 * If this was the last connection in the session and one of the
4322 * following is occurring:
4324 * Session Reinstatement is not being performed, and are falling back
4325 * to ERL=0 call iscsit_close_session().
4327 * Session Logout was requested. iscsit_close_session() will be called
4330 * Session Continuation is not being performed, start the Time2Retain
4331 * handler and check if sleep_on_sess_wait_sem is active.
4333 if (!atomic_read(&sess->session_reinstatement) &&
4334 atomic_read(&sess->session_fall_back_to_erl0)) {
4335 spin_unlock_bh(&sess->conn_lock);
4336 target_put_session(sess->se_sess);
4339 } else if (atomic_read(&sess->session_logout)) {
4340 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4341 sess->session_state = TARG_SESS_STATE_FREE;
4342 spin_unlock_bh(&sess->conn_lock);
4344 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4345 complete(&sess->session_wait_comp);
4349 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4350 sess->session_state = TARG_SESS_STATE_FAILED;
4352 if (!atomic_read(&sess->session_continuation)) {
4353 spin_unlock_bh(&sess->conn_lock);
4354 iscsit_start_time2retain_handler(sess);
4356 spin_unlock_bh(&sess->conn_lock);
4358 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4359 complete(&sess->session_wait_comp);
4363 spin_unlock_bh(&sess->conn_lock);
4368 int iscsit_close_session(struct iscsi_session *sess)
4370 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4371 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4373 if (atomic_read(&sess->nconn)) {
4374 pr_err("%d connection(s) still exist for iSCSI session"
4375 " to %s\n", atomic_read(&sess->nconn),
4376 sess->sess_ops->InitiatorName);
4380 spin_lock_bh(&se_tpg->session_lock);
4381 atomic_set(&sess->session_logout, 1);
4382 atomic_set(&sess->session_reinstatement, 1);
4383 iscsit_stop_time2retain_timer(sess);
4384 spin_unlock_bh(&se_tpg->session_lock);
4387 * transport_deregister_session_configfs() will clear the
4388 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4389 * can be setting it again with __transport_register_session() in
4390 * iscsi_post_login_handler() again after the iscsit_stop_session()
4391 * completes in iscsi_np context.
4393 transport_deregister_session_configfs(sess->se_sess);
4396 * If any other processes are accessing this session pointer we must
4397 * wait until they have completed. If we are in an interrupt (the
4398 * time2retain handler) and contain and active session usage count we
4399 * restart the timer and exit.
4401 if (!in_interrupt()) {
4402 if (iscsit_check_session_usage_count(sess) == 1)
4403 iscsit_stop_session(sess, 1, 1);
4405 if (iscsit_check_session_usage_count(sess) == 2) {
4406 atomic_set(&sess->session_logout, 0);
4407 iscsit_start_time2retain_handler(sess);
4412 transport_deregister_session(sess->se_sess);
4414 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4415 iscsit_free_connection_recovery_entires(sess);
4417 iscsit_free_all_ooo_cmdsns(sess);
4419 spin_lock_bh(&se_tpg->session_lock);
4420 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4421 sess->session_state = TARG_SESS_STATE_FREE;
4422 pr_debug("Released iSCSI session from node: %s\n",
4423 sess->sess_ops->InitiatorName);
4426 tpg->tpg_tiqn->tiqn_nsessions--;
4428 pr_debug("Decremented number of active iSCSI Sessions on"
4429 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4431 spin_lock(&sess_idr_lock);
4432 idr_remove(&sess_idr, sess->session_index);
4433 spin_unlock(&sess_idr_lock);
4435 kfree(sess->sess_ops);
4436 sess->sess_ops = NULL;
4437 spin_unlock_bh(&se_tpg->session_lock);
4443 static void iscsit_logout_post_handler_closesession(
4444 struct iscsi_conn *conn)
4446 struct iscsi_session *sess = conn->sess;
4448 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4449 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4451 atomic_set(&conn->conn_logout_remove, 0);
4452 complete(&conn->conn_logout_comp);
4454 iscsit_dec_conn_usage_count(conn);
4455 iscsit_stop_session(sess, 1, 1);
4456 iscsit_dec_session_usage_count(sess);
4457 target_put_session(sess->se_sess);
4460 static void iscsit_logout_post_handler_samecid(
4461 struct iscsi_conn *conn)
4463 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4464 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4466 atomic_set(&conn->conn_logout_remove, 0);
4467 complete(&conn->conn_logout_comp);
4469 iscsit_cause_connection_reinstatement(conn, 1);
4470 iscsit_dec_conn_usage_count(conn);
4473 static void iscsit_logout_post_handler_diffcid(
4474 struct iscsi_conn *conn,
4477 struct iscsi_conn *l_conn;
4478 struct iscsi_session *sess = conn->sess;
4483 spin_lock_bh(&sess->conn_lock);
4484 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4485 if (l_conn->cid == cid) {
4486 iscsit_inc_conn_usage_count(l_conn);
4490 spin_unlock_bh(&sess->conn_lock);
4496 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4498 spin_lock_bh(&l_conn->state_lock);
4499 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4500 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4501 spin_unlock_bh(&l_conn->state_lock);
4503 iscsit_cause_connection_reinstatement(l_conn, 1);
4504 iscsit_dec_conn_usage_count(l_conn);
4508 * Return of 0 causes the TX thread to restart.
4510 int iscsit_logout_post_handler(
4511 struct iscsi_cmd *cmd,
4512 struct iscsi_conn *conn)
4516 switch (cmd->logout_reason) {
4517 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4518 switch (cmd->logout_response) {
4519 case ISCSI_LOGOUT_SUCCESS:
4520 case ISCSI_LOGOUT_CLEANUP_FAILED:
4522 iscsit_logout_post_handler_closesession(conn);
4527 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4528 if (conn->cid == cmd->logout_cid) {
4529 switch (cmd->logout_response) {
4530 case ISCSI_LOGOUT_SUCCESS:
4531 case ISCSI_LOGOUT_CLEANUP_FAILED:
4533 iscsit_logout_post_handler_samecid(conn);
4538 switch (cmd->logout_response) {
4539 case ISCSI_LOGOUT_SUCCESS:
4540 iscsit_logout_post_handler_diffcid(conn,
4543 case ISCSI_LOGOUT_CID_NOT_FOUND:
4544 case ISCSI_LOGOUT_CLEANUP_FAILED:
4551 case ISCSI_LOGOUT_REASON_RECOVERY:
4552 switch (cmd->logout_response) {
4553 case ISCSI_LOGOUT_SUCCESS:
4554 case ISCSI_LOGOUT_CID_NOT_FOUND:
4555 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4556 case ISCSI_LOGOUT_CLEANUP_FAILED:
4568 EXPORT_SYMBOL(iscsit_logout_post_handler);
4570 void iscsit_fail_session(struct iscsi_session *sess)
4572 struct iscsi_conn *conn;
4574 spin_lock_bh(&sess->conn_lock);
4575 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4576 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4577 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4579 spin_unlock_bh(&sess->conn_lock);
4581 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4582 sess->session_state = TARG_SESS_STATE_FAILED;
4585 int iscsit_free_session(struct iscsi_session *sess)
4587 u16 conn_count = atomic_read(&sess->nconn);
4588 struct iscsi_conn *conn, *conn_tmp = NULL;
4591 spin_lock_bh(&sess->conn_lock);
4592 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4594 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4596 if (conn_count == 0)
4599 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4602 iscsit_inc_conn_usage_count(conn_tmp);
4605 iscsit_inc_conn_usage_count(conn);
4607 spin_unlock_bh(&sess->conn_lock);
4608 iscsit_cause_connection_reinstatement(conn, 1);
4609 spin_lock_bh(&sess->conn_lock);
4611 iscsit_dec_conn_usage_count(conn);
4613 iscsit_dec_conn_usage_count(conn_tmp);
4618 if (atomic_read(&sess->nconn)) {
4619 spin_unlock_bh(&sess->conn_lock);
4620 wait_for_completion(&sess->session_wait_comp);
4622 spin_unlock_bh(&sess->conn_lock);
4624 target_put_session(sess->se_sess);
4628 void iscsit_stop_session(
4629 struct iscsi_session *sess,
4631 int connection_sleep)
4633 u16 conn_count = atomic_read(&sess->nconn);
4634 struct iscsi_conn *conn, *conn_tmp = NULL;
4637 spin_lock_bh(&sess->conn_lock);
4639 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4641 if (connection_sleep) {
4642 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4644 if (conn_count == 0)
4647 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4650 iscsit_inc_conn_usage_count(conn_tmp);
4653 iscsit_inc_conn_usage_count(conn);
4655 spin_unlock_bh(&sess->conn_lock);
4656 iscsit_cause_connection_reinstatement(conn, 1);
4657 spin_lock_bh(&sess->conn_lock);
4659 iscsit_dec_conn_usage_count(conn);
4661 iscsit_dec_conn_usage_count(conn_tmp);
4665 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4666 iscsit_cause_connection_reinstatement(conn, 0);
4669 if (session_sleep && atomic_read(&sess->nconn)) {
4670 spin_unlock_bh(&sess->conn_lock);
4671 wait_for_completion(&sess->session_wait_comp);
4673 spin_unlock_bh(&sess->conn_lock);
4676 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4678 struct iscsi_session *sess;
4679 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4680 struct se_session *se_sess, *se_sess_tmp;
4681 int session_count = 0;
4683 spin_lock_bh(&se_tpg->session_lock);
4684 if (tpg->nsessions && !force) {
4685 spin_unlock_bh(&se_tpg->session_lock);
4689 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4691 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4693 spin_lock(&sess->conn_lock);
4694 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4695 atomic_read(&sess->session_logout) ||
4696 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4697 spin_unlock(&sess->conn_lock);
4700 atomic_set(&sess->session_reinstatement, 1);
4701 spin_unlock(&sess->conn_lock);
4702 spin_unlock_bh(&se_tpg->session_lock);
4704 iscsit_free_session(sess);
4705 spin_lock_bh(&se_tpg->session_lock);
4709 spin_unlock_bh(&se_tpg->session_lock);
4711 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4712 " Group: %hu\n", session_count, tpg->tpgt);
4716 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4717 MODULE_VERSION("4.1.x");
4718 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4719 MODULE_LICENSE("GPL");
4721 module_init(iscsi_target_init_module);
4722 module_exit(iscsi_target_cleanup_module);