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linux/drivers/target/iscsi/iscsi_target.c
Jörn Engel 8359cf43b9 target: remove useless casts 
A reader should spend an extra moment whenever noticing a cast,
because either something special is going on that deserves extra
attention or, as is all too often the case, the code is wrong.

These casts, afaics, have all been useless.  They cast a foo* to a
foo*, cast a void* to the assigned type, cast a foo* to void*, before
assigning it to a void* variable, etc.

In a few cases I also removed an additional &...[0], which is equally
useless.

Lastly I added three FIXMEs where, to the best of my judgement, the
code appears to have a bug.  It would be good if someone could check
these.

Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-14 11:28:07 +00:00

4530 lines
123 KiB
C
Raw Blame History

/*******************************************************************************
* This file contains main functions related to the iSCSI Target Core Driver.
*
* \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
*
* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
*
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
******************************************************************************/
#include <linux/string.h>
#include <linux/kthread.h>
#include <linux/crypto.h>
#include <linux/completion.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#include <scsi/scsi_device.h>
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include "iscsi_target_core.h"
#include "iscsi_target_parameters.h"
#include "iscsi_target_seq_pdu_list.h"
#include "iscsi_target_tq.h"
#include "iscsi_target_configfs.h"
#include "iscsi_target_datain_values.h"
#include "iscsi_target_erl0.h"
#include "iscsi_target_erl1.h"
#include "iscsi_target_erl2.h"
#include "iscsi_target_login.h"
#include "iscsi_target_tmr.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include "iscsi_target_device.h"
#include "iscsi_target_stat.h"
static LIST_HEAD(g_tiqn_list);
static LIST_HEAD(g_np_list);
static DEFINE_SPINLOCK(tiqn_lock);
static DEFINE_SPINLOCK(np_lock);
static struct idr tiqn_idr;
struct idr sess_idr;
struct mutex auth_id_lock;
spinlock_t sess_idr_lock;
struct iscsit_global *iscsit_global;
struct kmem_cache *lio_cmd_cache;
struct kmem_cache *lio_qr_cache;
struct kmem_cache *lio_dr_cache;
struct kmem_cache *lio_ooo_cache;
struct kmem_cache *lio_r2t_cache;
static int iscsit_handle_immediate_data(struct iscsi_cmd *,
unsigned char *buf, u32);
static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
{
struct iscsi_tiqn *tiqn = NULL;
spin_lock(&tiqn_lock);
list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
if (!strcmp(tiqn->tiqn, buf)) {
spin_lock(&tiqn->tiqn_state_lock);
if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
tiqn->tiqn_access_count++;
spin_unlock(&tiqn->tiqn_state_lock);
spin_unlock(&tiqn_lock);
return tiqn;
}
spin_unlock(&tiqn->tiqn_state_lock);
}
}
spin_unlock(&tiqn_lock);
return NULL;
}
static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
{
spin_lock(&tiqn->tiqn_state_lock);
if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
spin_unlock(&tiqn->tiqn_state_lock);
return 0;
}
spin_unlock(&tiqn->tiqn_state_lock);
return -1;
}
void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
{
spin_lock(&tiqn->tiqn_state_lock);
tiqn->tiqn_access_count--;
spin_unlock(&tiqn->tiqn_state_lock);
}
/*
* Note that IQN formatting is expected to be done in userspace, and
* no explict IQN format checks are done here.
*/
struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
{
struct iscsi_tiqn *tiqn = NULL;
int ret;
if (strlen(buf) >= ISCSI_IQN_LEN) {
pr_err("Target IQN exceeds %d bytes\n",
ISCSI_IQN_LEN);
return ERR_PTR(-EINVAL);
}
tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
if (!tiqn) {
pr_err("Unable to allocate struct iscsi_tiqn\n");
return ERR_PTR(-ENOMEM);
}
sprintf(tiqn->tiqn, "%s", buf);
INIT_LIST_HEAD(&tiqn->tiqn_list);
INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
spin_lock_init(&tiqn->tiqn_state_lock);
spin_lock_init(&tiqn->tiqn_tpg_lock);
spin_lock_init(&tiqn->sess_err_stats.lock);
spin_lock_init(&tiqn->login_stats.lock);
spin_lock_init(&tiqn->logout_stats.lock);
if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
pr_err("idr_pre_get() for tiqn_idr failed\n");
kfree(tiqn);
return ERR_PTR(-ENOMEM);
}
tiqn->tiqn_state = TIQN_STATE_ACTIVE;
spin_lock(&tiqn_lock);
ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
if (ret < 0) {
pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
spin_unlock(&tiqn_lock);
kfree(tiqn);
return ERR_PTR(ret);
}
list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
spin_unlock(&tiqn_lock);
pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
return tiqn;
}
static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
{
/*
* Wait for accesses to said struct iscsi_tiqn to end.
*/
spin_lock(&tiqn->tiqn_state_lock);
while (tiqn->tiqn_access_count != 0) {
spin_unlock(&tiqn->tiqn_state_lock);
msleep(10);
spin_lock(&tiqn->tiqn_state_lock);
}
spin_unlock(&tiqn->tiqn_state_lock);
}
void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
{
/*
* iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
* while holding tiqn->tiqn_state_lock. This means that all subsequent
* attempts to access this struct iscsi_tiqn will fail from both transport
* fabric and control code paths.
*/
if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
pr_err("iscsit_set_tiqn_shutdown() failed\n");
return;
}
iscsit_wait_for_tiqn(tiqn);
spin_lock(&tiqn_lock);
list_del(&tiqn->tiqn_list);
idr_remove(&tiqn_idr, tiqn->tiqn_index);
spin_unlock(&tiqn_lock);
pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
tiqn->tiqn);
kfree(tiqn);
}
int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
{
int ret;
/*
* Determine if the network portal is accepting storage traffic.
*/
spin_lock_bh(&np->np_thread_lock);
if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
spin_unlock_bh(&np->np_thread_lock);
return -1;
}
if (np->np_login_tpg) {
pr_err("np->np_login_tpg() is not NULL!\n");
spin_unlock_bh(&np->np_thread_lock);
return -1;
}
spin_unlock_bh(&np->np_thread_lock);
/*
* Determine if the portal group is accepting storage traffic.
*/
spin_lock_bh(&tpg->tpg_state_lock);
if (tpg->tpg_state != TPG_STATE_ACTIVE) {
spin_unlock_bh(&tpg->tpg_state_lock);
return -1;
}
spin_unlock_bh(&tpg->tpg_state_lock);
/*
* Here we serialize access across the TIQN+TPG Tuple.
*/
ret = mutex_lock_interruptible(&tpg->np_login_lock);
if ((ret != 0) || signal_pending(current))
return -1;
spin_lock_bh(&np->np_thread_lock);
np->np_login_tpg = tpg;
spin_unlock_bh(&np->np_thread_lock);
return 0;
}
int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
{
struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
spin_lock_bh(&np->np_thread_lock);
np->np_login_tpg = NULL;
spin_unlock_bh(&np->np_thread_lock);
mutex_unlock(&tpg->np_login_lock);
if (tiqn)
iscsit_put_tiqn_for_login(tiqn);
return 0;
}
static struct iscsi_np *iscsit_get_np(
struct __kernel_sockaddr_storage *sockaddr,
int network_transport)
{
struct sockaddr_in *sock_in, *sock_in_e;
struct sockaddr_in6 *sock_in6, *sock_in6_e;
struct iscsi_np *np;
int ip_match = 0;
u16 port;
spin_lock_bh(&np_lock);
list_for_each_entry(np, &g_np_list, np_list) {
spin_lock(&np->np_thread_lock);
if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
spin_unlock(&np->np_thread_lock);
continue;
}
if (sockaddr->ss_family == AF_INET6) {
sock_in6 = (struct sockaddr_in6 *)sockaddr;
sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
if (!memcmp(&sock_in6->sin6_addr.in6_u,
&sock_in6_e->sin6_addr.in6_u,
sizeof(struct in6_addr)))
ip_match = 1;
port = ntohs(sock_in6->sin6_port);
} else {
sock_in = (struct sockaddr_in *)sockaddr;
sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
if (sock_in->sin_addr.s_addr ==
sock_in_e->sin_addr.s_addr)
ip_match = 1;
port = ntohs(sock_in->sin_port);
}
if ((ip_match == 1) && (np->np_port == port) &&
(np->np_network_transport == network_transport)) {
/*
* Increment the np_exports reference count now to
* prevent iscsit_del_np() below from being called
* while iscsi_tpg_add_network_portal() is called.
*/
np->np_exports++;
spin_unlock(&np->np_thread_lock);
spin_unlock_bh(&np_lock);
return np;
}
spin_unlock(&np->np_thread_lock);
}
spin_unlock_bh(&np_lock);
return NULL;
}
struct iscsi_np *iscsit_add_np(
struct __kernel_sockaddr_storage *sockaddr,
char *ip_str,
int network_transport)
{
struct sockaddr_in *sock_in;
struct sockaddr_in6 *sock_in6;
struct iscsi_np *np;
int ret;
/*
* Locate the existing struct iscsi_np if already active..
*/
np = iscsit_get_np(sockaddr, network_transport);
if (np)
return np;
np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
if (!np) {
pr_err("Unable to allocate memory for struct iscsi_np\n");
return ERR_PTR(-ENOMEM);
}
np->np_flags |= NPF_IP_NETWORK;
if (sockaddr->ss_family == AF_INET6) {
sock_in6 = (struct sockaddr_in6 *)sockaddr;
snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
np->np_port = ntohs(sock_in6->sin6_port);
} else {
sock_in = (struct sockaddr_in *)sockaddr;
sprintf(np->np_ip, "%s", ip_str);
np->np_port = ntohs(sock_in->sin_port);
}
np->np_network_transport = network_transport;
spin_lock_init(&np->np_thread_lock);
init_completion(&np->np_restart_comp);
INIT_LIST_HEAD(&np->np_list);
ret = iscsi_target_setup_login_socket(np, sockaddr);
if (ret != 0) {
kfree(np);
return ERR_PTR(ret);
}
np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
if (IS_ERR(np->np_thread)) {
pr_err("Unable to create kthread: iscsi_np\n");
ret = PTR_ERR(np->np_thread);
kfree(np);
return ERR_PTR(ret);
}
/*
* Increment the np_exports reference count now to prevent
* iscsit_del_np() below from being run while a new call to
* iscsi_tpg_add_network_portal() for a matching iscsi_np is
* active. We don't need to hold np->np_thread_lock at this
* point because iscsi_np has not been added to g_np_list yet.
*/
np->np_exports = 1;
spin_lock_bh(&np_lock);
list_add_tail(&np->np_list, &g_np_list);
spin_unlock_bh(&np_lock);
pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
"TCP" : "SCTP");
return np;
}
int iscsit_reset_np_thread(
struct iscsi_np *np,
struct iscsi_tpg_np *tpg_np,
struct iscsi_portal_group *tpg)
{
spin_lock_bh(&np->np_thread_lock);
if (tpg && tpg_np) {
/*
* The reset operation need only be performed when the
* passed struct iscsi_portal_group has a login in progress
* to one of the network portals.
*/
if (tpg_np->tpg_np->np_login_tpg != tpg) {
spin_unlock_bh(&np->np_thread_lock);
return 0;
}
}
if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
spin_unlock_bh(&np->np_thread_lock);
return 0;
}
np->np_thread_state = ISCSI_NP_THREAD_RESET;
if (np->np_thread) {
spin_unlock_bh(&np->np_thread_lock);
send_sig(SIGINT, np->np_thread, 1);
wait_for_completion(&np->np_restart_comp);
spin_lock_bh(&np->np_thread_lock);
}
spin_unlock_bh(&np->np_thread_lock);
return 0;
}
int iscsit_del_np_comm(struct iscsi_np *np)
{
if (!np->np_socket)
return 0;
/*
* Some network transports allocate their own struct sock->file,
* see if we need to free any additional allocated resources.
*/
if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
kfree(np->np_socket->file);
np->np_socket->file = NULL;
}
sock_release(np->np_socket);
return 0;
}
int iscsit_del_np(struct iscsi_np *np)
{
spin_lock_bh(&np->np_thread_lock);
np->np_exports--;
if (np->np_exports) {
spin_unlock_bh(&np->np_thread_lock);
return 0;
}
np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
spin_unlock_bh(&np->np_thread_lock);
if (np->np_thread) {
/*
* We need to send the signal to wakeup Linux/Net
* which may be sleeping in sock_accept()..
*/
send_sig(SIGINT, np->np_thread, 1);
kthread_stop(np->np_thread);
}
iscsit_del_np_comm(np);
spin_lock_bh(&np_lock);
list_del(&np->np_list);
spin_unlock_bh(&np_lock);
pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
"TCP" : "SCTP");
kfree(np);
return 0;
}
static int __init iscsi_target_init_module(void)
{
int ret = 0;
pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
if (!iscsit_global) {
pr_err("Unable to allocate memory for iscsit_global\n");
return -1;
}
mutex_init(&auth_id_lock);
spin_lock_init(&sess_idr_lock);
idr_init(&tiqn_idr);
idr_init(&sess_idr);
ret = iscsi_target_register_configfs();
if (ret < 0)
goto out;
ret = iscsi_thread_set_init();
if (ret < 0)
goto configfs_out;
if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
TARGET_THREAD_SET_COUNT) {
pr_err("iscsi_allocate_thread_sets() returned"
" unexpected value!\n");
goto ts_out1;
}
lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
0, NULL);
if (!lio_cmd_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_cmd_cache\n");
goto ts_out2;
}
lio_qr_cache = kmem_cache_create("lio_qr_cache",
sizeof(struct iscsi_queue_req),
__alignof__(struct iscsi_queue_req), 0, NULL);
if (!lio_qr_cache) {
pr_err("nable to kmem_cache_create() for"
" lio_qr_cache\n");
goto cmd_out;
}
lio_dr_cache = kmem_cache_create("lio_dr_cache",
sizeof(struct iscsi_datain_req),
__alignof__(struct iscsi_datain_req), 0, NULL);
if (!lio_dr_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_dr_cache\n");
goto qr_out;
}
lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
sizeof(struct iscsi_ooo_cmdsn),
__alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
if (!lio_ooo_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_ooo_cache\n");
goto dr_out;
}
lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
0, NULL);
if (!lio_r2t_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_r2t_cache\n");
goto ooo_out;
}
if (iscsit_load_discovery_tpg() < 0)
goto r2t_out;
return ret;
r2t_out:
kmem_cache_destroy(lio_r2t_cache);
ooo_out:
kmem_cache_destroy(lio_ooo_cache);
dr_out:
kmem_cache_destroy(lio_dr_cache);
qr_out:
kmem_cache_destroy(lio_qr_cache);
cmd_out:
kmem_cache_destroy(lio_cmd_cache);
ts_out2:
iscsi_deallocate_thread_sets();
ts_out1:
iscsi_thread_set_free();
configfs_out:
iscsi_target_deregister_configfs();
out:
kfree(iscsit_global);
return -ENOMEM;
}
static void __exit iscsi_target_cleanup_module(void)
{
iscsi_deallocate_thread_sets();
iscsi_thread_set_free();
iscsit_release_discovery_tpg();
kmem_cache_destroy(lio_cmd_cache);
kmem_cache_destroy(lio_qr_cache);
kmem_cache_destroy(lio_dr_cache);
kmem_cache_destroy(lio_ooo_cache);
kmem_cache_destroy(lio_r2t_cache);
iscsi_target_deregister_configfs();
kfree(iscsit_global);
}
int iscsit_add_reject(
u8 reason,
int fail_conn,
unsigned char *buf,
struct iscsi_conn *conn)
{
struct iscsi_cmd *cmd;
struct iscsi_reject *hdr;
int ret;
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
return -1;
cmd->iscsi_opcode = ISCSI_OP_REJECT;
if (fail_conn)
cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
hdr = (struct iscsi_reject *) cmd->pdu;
hdr->reason = reason;
cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
if (!cmd->buf_ptr) {
pr_err("Unable to allocate memory for cmd->buf_ptr\n");
iscsit_release_cmd(cmd);
return -1;
}
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
cmd->i_state = ISTATE_SEND_REJECT;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
ret = wait_for_completion_interruptible(&cmd->reject_comp);
if (ret != 0)
return -1;
return (!fail_conn) ? 0 : -1;
}
int iscsit_add_reject_from_cmd(
u8 reason,
int fail_conn,
int add_to_conn,
unsigned char *buf,
struct iscsi_cmd *cmd)
{
struct iscsi_conn *conn;
struct iscsi_reject *hdr;
int ret;
if (!cmd->conn) {
pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
cmd->init_task_tag);
return -1;
}
conn = cmd->conn;
cmd->iscsi_opcode = ISCSI_OP_REJECT;
if (fail_conn)
cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
hdr = (struct iscsi_reject *) cmd->pdu;
hdr->reason = reason;
cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
if (!cmd->buf_ptr) {
pr_err("Unable to allocate memory for cmd->buf_ptr\n");
iscsit_release_cmd(cmd);
return -1;
}
if (add_to_conn) {
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
}
cmd->i_state = ISTATE_SEND_REJECT;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
ret = wait_for_completion_interruptible(&cmd->reject_comp);
if (ret != 0)
return -1;
return (!fail_conn) ? 0 : -1;
}
/*
* Map some portion of the allocated scatterlist to an iovec, suitable for
* kernel sockets to copy data in/out. This handles both pages and slab-allocated
* buffers, since we have been tricky and mapped t_mem_sg to the buffer in
* either case (see iscsit_alloc_buffs)
*/
static int iscsit_map_iovec(
struct iscsi_cmd *cmd,
struct kvec *iov,
u32 data_offset,
u32 data_length)
{
u32 i = 0;
struct scatterlist *sg;
unsigned int page_off;
/*
* We have a private mapping of the allocated pages in t_mem_sg.
* At this point, we also know each contains a page.
*/
sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
page_off = (data_offset % PAGE_SIZE);
cmd->first_data_sg = sg;
cmd->first_data_sg_off = page_off;
while (data_length) {
u32 cur_len = min_t(u32, data_length, sg->length - page_off);
iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
iov[i].iov_len = cur_len;
data_length -= cur_len;
page_off = 0;
sg = sg_next(sg);
i++;
}
cmd->kmapped_nents = i;
return i;
}
static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
{
u32 i;
struct scatterlist *sg;
sg = cmd->first_data_sg;
for (i = 0; i < cmd->kmapped_nents; i++)
kunmap(sg_page(&sg[i]));
}
static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
{
struct iscsi_cmd *cmd;
conn->exp_statsn = exp_statsn;
spin_lock_bh(&conn->cmd_lock);
list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
spin_lock(&cmd->istate_lock);
if ((cmd->i_state == ISTATE_SENT_STATUS) &&
(cmd->stat_sn < exp_statsn)) {
cmd->i_state = ISTATE_REMOVE;
spin_unlock(&cmd->istate_lock);
iscsit_add_cmd_to_immediate_queue(cmd, conn,
cmd->i_state);
continue;
}
spin_unlock(&cmd->istate_lock);
}
spin_unlock_bh(&conn->cmd_lock);
}
static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
{
u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
cmd->se_cmd.t_data_nents;
iov_count += ISCSI_IOV_DATA_BUFFER;
cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
if (!cmd->iov_data) {
pr_err("Unable to allocate cmd->iov_data\n");
return -ENOMEM;
}
cmd->orig_iov_data_count = iov_count;
return 0;
}
static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
{
struct scatterlist *sgl;
u32 length = cmd->se_cmd.data_length;
int nents = DIV_ROUND_UP(length, PAGE_SIZE);
int i = 0, ret;
/*
* If no SCSI payload is present, allocate the default iovecs used for
* iSCSI PDU Header
*/
if (!length)
return iscsit_allocate_iovecs(cmd);
sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
if (!sgl)
return -ENOMEM;
sg_init_table(sgl, nents);
while (length) {
int buf_size = min_t(int, length, PAGE_SIZE);
struct page *page;
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page)
goto page_alloc_failed;
sg_set_page(&sgl[i], page, buf_size, 0);
length -= buf_size;
i++;
}
cmd->t_mem_sg = sgl;
cmd->t_mem_sg_nents = nents;
/* BIDI ops not supported */
/* Tell the core about our preallocated memory */
transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
/*
* Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
* so that cmd->se_cmd.t_tasks_se_num has been set.
*/
ret = iscsit_allocate_iovecs(cmd);
if (ret < 0)
goto page_alloc_failed;
return 0;
page_alloc_failed:
while (i >= 0) {
__free_page(sg_page(&sgl[i]));
i--;
}
kfree(cmd->t_mem_sg);
cmd->t_mem_sg = NULL;
return -ENOMEM;
}
static int iscsit_handle_scsi_cmd(
struct iscsi_conn *conn,
unsigned char *buf)
{
int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
int dump_immediate_data = 0, send_check_condition = 0, payload_length;
struct iscsi_cmd *cmd = NULL;
struct iscsi_scsi_req *hdr;
spin_lock_bh(&conn->sess->session_stats_lock);
conn->sess->cmd_pdus++;
if (conn->sess->se_sess->se_node_acl) {
spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
conn->sess->se_sess->se_node_acl->num_cmds++;
spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
}
spin_unlock_bh(&conn->sess->session_stats_lock);
hdr = (struct iscsi_scsi_req *) buf;
payload_length = ntoh24(hdr->dlength);
hdr->itt = be32_to_cpu(hdr->itt);
hdr->data_length = be32_to_cpu(hdr->data_length);
hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
/* FIXME; Add checks for AdditionalHeaderSegment */
if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
" not set. Bad iSCSI Initiator.\n");
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
buf, conn);
}
if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
(hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
/*
* Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
* that adds support for RESERVE/RELEASE. There is a bug
* add with this new functionality that sets R/W bits when
* neither CDB carries any READ or WRITE datapayloads.
*/
if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
hdr->flags &= ~ISCSI_FLAG_CMD_READ;
hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
goto done;
}
pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
" set when Expected Data Transfer Length is 0 for"
" CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
buf, conn);
}
done:
if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
" MUST be set if Expected Data Transfer Length is not 0."
" Bad iSCSI Initiator\n");
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
buf, conn);
}
if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
(hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
pr_err("Bidirectional operations not supported!\n");
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
buf, conn);
}
if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
pr_err("Illegally set Immediate Bit in iSCSI Initiator"
" Scsi Command PDU.\n");
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
buf, conn);
}
if (payload_length && !conn->sess->sess_ops->ImmediateData) {
pr_err("ImmediateData=No but DataSegmentLength=%u,"
" protocol error.\n", payload_length);
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
if ((hdr->data_length == payload_length) &&
(!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
pr_err("Expected Data Transfer Length and Length of"
" Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
" bit is not set protocol error\n");
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
if (payload_length > hdr->data_length) {
pr_err("DataSegmentLength: %u is greater than"
" EDTL: %u, protocol error.\n", payload_length,
hdr->data_length);
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
pr_err("DataSegmentLength: %u is greater than"
" MaxRecvDataSegmentLength: %u, protocol error.\n",
payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
pr_err("DataSegmentLength: %u is greater than"
" FirstBurstLength: %u, protocol error.\n",
payload_length, conn->sess->sess_ops->FirstBurstLength);
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
buf, conn);
}
data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
(hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
DMA_NONE;
cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
(hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
if (!cmd)
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
buf, conn);
pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
" ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
cmd->i_state = ISTATE_NEW_CMD;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
cmd->immediate_data = (payload_length) ? 1 : 0;
cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
(hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
if (cmd->unsolicited_data)
cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
if (hdr->flags & ISCSI_FLAG_CMD_READ) {
spin_lock_bh(&conn->sess->ttt_lock);
cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
if (cmd->targ_xfer_tag == 0xFFFFFFFF)
cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
spin_unlock_bh(&conn->sess->ttt_lock);
} else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = hdr->cmdsn;
cmd->exp_stat_sn = hdr->exp_statsn;
cmd->first_burst_len = payload_length;
if (cmd->data_direction == DMA_FROM_DEVICE) {
struct iscsi_datain_req *dr;
dr = iscsit_allocate_datain_req();
if (!dr)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1, 1, buf, cmd);
iscsit_attach_datain_req(cmd, dr);
}
/*
* The CDB is going to an se_device_t.
*/
ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
get_unaligned_le64(&hdr->lun));
if (ret < 0) {
if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
pr_debug("Responding to non-acl'ed,"
" non-existent or non-exported iSCSI LUN:"
" 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
}
send_check_condition = 1;
goto attach_cmd;
}
/*
* The Initiator Node has access to the LUN (the addressing method
* is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
* allocate 1->N transport tasks (depending on sector count and
* maximum request size the physical HBA(s) can handle.
*/
transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
if (transport_ret == -ENOMEM) {
return iscsit_add_reject_from_cmd(
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1, 1, buf, cmd);
} else if (transport_ret == -EINVAL) {
/*
* Unsupported SAM Opcode. CHECK_CONDITION will be sent
* in iscsit_execute_cmd() during the CmdSN OOO Execution
* Mechinism.
*/
send_check_condition = 1;
} else {
cmd->data_length = cmd->se_cmd.data_length;
if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1, 1, buf, cmd);
}
attach_cmd:
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
/*
* Check if we need to delay processing because of ALUA
* Active/NonOptimized primary access state..
*/
core_alua_check_nonop_delay(&cmd->se_cmd);
/*
* Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
* also call iscsit_allocate_iovecs()
*/
ret = iscsit_alloc_buffs(cmd);
if (ret < 0)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1, 1, buf, cmd);
/*
* Check the CmdSN against ExpCmdSN/MaxCmdSN here if
* the Immediate Bit is not set, and no Immediate
* Data is attached.
*
* A PDU/CmdSN carrying Immediate Data can only
* be processed after the DataCRC has passed.
* If the DataCRC fails, the CmdSN MUST NOT
* be acknowledged. (See below)
*/
if (!cmd->immediate_data) {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
return 0;
else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
}
iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
/*
* If no Immediate Data is attached, it's OK to return now.
*/
if (!cmd->immediate_data) {
if (send_check_condition)
return 0;
if (cmd->unsolicited_data) {
iscsit_set_dataout_sequence_values(cmd);
spin_lock_bh(&cmd->dataout_timeout_lock);
iscsit_start_dataout_timer(cmd, cmd->conn);
spin_unlock_bh(&cmd->dataout_timeout_lock);
}
return 0;
}
/*
* Early CHECK_CONDITIONs never make it to the transport processing
* thread. They are processed in CmdSN order by
* iscsit_check_received_cmdsn() below.
*/
if (send_check_condition) {
immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
dump_immediate_data = 1;
goto after_immediate_data;
}
/*
* Call directly into transport_generic_new_cmd() to perform
* the backend memory allocation.
*/
ret = transport_generic_new_cmd(&cmd->se_cmd);
if (ret < 0) {
immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
dump_immediate_data = 1;
goto after_immediate_data;
}
immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
after_immediate_data:
if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
/*
* A PDU/CmdSN carrying Immediate Data passed
* DataCRC, check against ExpCmdSN/MaxCmdSN if
* Immediate Bit is not set.
*/
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
/*
* Special case for Unsupported SAM WRITE Opcodes
* and ImmediateData=Yes.
*/
if (dump_immediate_data) {
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return -1;
} else if (cmd->unsolicited_data) {
iscsit_set_dataout_sequence_values(cmd);
spin_lock_bh(&cmd->dataout_timeout_lock);
iscsit_start_dataout_timer(cmd, cmd->conn);
spin_unlock_bh(&cmd->dataout_timeout_lock);
}
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
} else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
/*
* Immediate Data failed DataCRC and ERL>=1,
* silently drop this PDU and let the initiator
* plug the CmdSN gap.
*
* FIXME: Send Unsolicited NOPIN with reserved
* TTT here to help the initiator figure out
* the missing CmdSN, although they should be
* intelligent enough to determine the missing
* CmdSN and issue a retry to plug the sequence.
*/
cmd->i_state = ISTATE_REMOVE;
iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
} else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
return -1;
return 0;
}
static u32 iscsit_do_crypto_hash_sg(
struct hash_desc *hash,
struct iscsi_cmd *cmd,
u32 data_offset,
u32 data_length,
u32 padding,
u8 *pad_bytes)
{
u32 data_crc;
u32 i;
struct scatterlist *sg;
unsigned int page_off;
crypto_hash_init(hash);
sg = cmd->first_data_sg;
page_off = cmd->first_data_sg_off;
i = 0;
while (data_length) {
u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
crypto_hash_update(hash, &sg[i], cur_len);
data_length -= cur_len;
page_off = 0;
i++;
}
if (padding) {
struct scatterlist pad_sg;
sg_init_one(&pad_sg, pad_bytes, padding);
crypto_hash_update(hash, &pad_sg, padding);
}
crypto_hash_final(hash, (u8 *) &data_crc);
return data_crc;
}
static void iscsit_do_crypto_hash_buf(
struct hash_desc *hash,
unsigned char *buf,
u32 payload_length,
u32 padding,
u8 *pad_bytes,
u8 *data_crc)
{
struct scatterlist sg;
crypto_hash_init(hash);
sg_init_one(&sg, buf, payload_length);
crypto_hash_update(hash, &sg, payload_length);
if (padding) {
sg_init_one(&sg, pad_bytes, padding);
crypto_hash_update(hash, &sg, padding);
}
crypto_hash_final(hash, data_crc);
}
static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
{
int iov_ret, ooo_cmdsn = 0, ret;
u8 data_crc_failed = 0;
u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
u32 rx_size = 0, payload_length;
struct iscsi_cmd *cmd = NULL;
struct se_cmd *se_cmd;
struct iscsi_data *hdr;
struct kvec *iov;
unsigned long flags;
hdr = (struct iscsi_data *) buf;
payload_length = ntoh24(hdr->dlength);
hdr->itt = be32_to_cpu(hdr->itt);
hdr->ttt = be32_to_cpu(hdr->ttt);
hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
hdr->datasn = be32_to_cpu(hdr->datasn);
hdr->offset = be32_to_cpu(hdr->offset);
if (!payload_length) {
pr_err("DataOUT payload is ZERO, protocol error.\n");
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
/* iSCSI write */
spin_lock_bh(&conn->sess->session_stats_lock);
conn->sess->rx_data_octets += payload_length;
if (conn->sess->se_sess->se_node_acl) {
spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
}
spin_unlock_bh(&conn->sess->session_stats_lock);
if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
pr_err("DataSegmentLength: %u is greater than"
" MaxRecvDataSegmentLength: %u\n", payload_length,
conn->conn_ops->MaxRecvDataSegmentLength);
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
payload_length);
if (!cmd)
return 0;
pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
payload_length, conn->cid);
if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
pr_err("Command ITT: 0x%08x received DataOUT after"
" last DataOUT received, dumping payload\n",
cmd->init_task_tag);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
if (cmd->data_direction != DMA_TO_DEVICE) {
pr_err("Command ITT: 0x%08x received DataOUT for a"
" NON-WRITE command.\n", cmd->init_task_tag);
return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
}
se_cmd = &cmd->se_cmd;
iscsit_mod_dataout_timer(cmd);
if ((hdr->offset + payload_length) > cmd->data_length) {
pr_err("DataOut Offset: %u, Length %u greater than"
" iSCSI Command EDTL %u, protocol error.\n",
hdr->offset, payload_length, cmd->data_length);
return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1, 0, buf, cmd);
}
if (cmd->unsolicited_data) {
int dump_unsolicited_data = 0;
if (conn->sess->sess_ops->InitialR2T) {
pr_err("Received unexpected unsolicited data"
" while InitialR2T=Yes, protocol error.\n");
transport_send_check_condition_and_sense(&cmd->se_cmd,
TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
return -1;
}
/*
* Special case for dealing with Unsolicited DataOUT
* and Unsupported SAM WRITE Opcodes and SE resource allocation
* failures;
*/
/* Something's amiss if we're not in WRITE_PENDING state... */
spin_lock_irqsave(&se_cmd->t_state_lock, flags);
WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
spin_lock_irqsave(&se_cmd->t_state_lock, flags);
if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
(se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
dump_unsolicited_data = 1;
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
if (dump_unsolicited_data) {
/*
* Check if a delayed TASK_ABORTED status needs to
* be sent now if the ISCSI_FLAG_CMD_FINAL has been
* received with the unsolicitied data out.
*/
if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
iscsit_stop_dataout_timer(cmd);
transport_check_aborted_status(se_cmd,
(hdr->flags & ISCSI_FLAG_CMD_FINAL));
return iscsit_dump_data_payload(conn, payload_length, 1);
}
} else {
/*
* For the normal solicited data path:
*
* Check for a delayed TASK_ABORTED status and dump any
* incoming data out payload if one exists. Also, when the
* ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
* data out sequence, we decrement outstanding_r2ts. Once
* outstanding_r2ts reaches zero, go ahead and send the delayed
* TASK_ABORTED status.
*/
if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
if (--cmd->outstanding_r2ts < 1) {
iscsit_stop_dataout_timer(cmd);
transport_check_aborted_status(
se_cmd, 1);
}
return iscsit_dump_data_payload(conn, payload_length, 1);
}
}
/*
* Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
* within-command recovery checks before receiving the payload.
*/
ret = iscsit_check_pre_dataout(cmd, buf);
if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
return 0;
else if (ret == DATAOUT_CANNOT_RECOVER)
return -1;
rx_size += payload_length;
iov = &cmd->iov_data[0];
iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
if (iov_ret < 0)
return -1;
iov_count += iov_ret;
padding = ((-payload_length) & 3);
if (padding != 0) {
iov[iov_count].iov_base = cmd->pad_bytes;
iov[iov_count++].iov_len = padding;
rx_size += padding;
pr_debug("Receiving %u padding bytes.\n", padding);
}
if (conn->conn_ops->DataDigest) {
iov[iov_count].iov_base = &checksum;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
iscsit_unmap_iovec(cmd);
if (rx_got != rx_size)
return -1;
if (conn->conn_ops->DataDigest) {
u32 data_crc;
data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
hdr->offset, payload_length, padding,
cmd->pad_bytes);
if (checksum != data_crc) {
pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
" DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
" does not match computed 0x%08x\n",
hdr->itt, hdr->offset, payload_length,
hdr->datasn, checksum, data_crc);
data_crc_failed = 1;
} else {
pr_debug("Got CRC32C DataDigest 0x%08x for"
" %u bytes of Data Out\n", checksum,
payload_length);
}
}
/*
* Increment post receive data and CRC values or perform
* within-command recovery.
*/
ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
return 0;
else if (ret == DATAOUT_SEND_R2T) {
iscsit_set_dataout_sequence_values(cmd);
iscsit_build_r2ts_for_cmd(cmd, conn, 0);
} else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
/*
* Handle extra special case for out of order
* Unsolicited Data Out.
*/
spin_lock_bh(&cmd->istate_lock);
ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
spin_unlock_bh(&cmd->istate_lock);
iscsit_stop_dataout_timer(cmd);
return (!ooo_cmdsn) ? transport_generic_handle_data(
&cmd->se_cmd) : 0;
} else /* DATAOUT_CANNOT_RECOVER */
return -1;
return 0;
}
static int iscsit_handle_nop_out(
struct iscsi_conn *conn,
unsigned char *buf)
{
unsigned char *ping_data = NULL;
int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
u32 checksum, data_crc, padding = 0, payload_length;
u64 lun;
struct iscsi_cmd *cmd = NULL;
struct kvec *iov = NULL;
struct iscsi_nopout *hdr;
hdr = (struct iscsi_nopout *) buf;
payload_length = ntoh24(hdr->dlength);
lun = get_unaligned_le64(&hdr->lun);
hdr->itt = be32_to_cpu(hdr->itt);
hdr->ttt = be32_to_cpu(hdr->ttt);
hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
" not set, protocol error.\n");
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
" greater than MaxRecvDataSegmentLength: %u, protocol"
" error.\n", payload_length,
conn->conn_ops->MaxRecvDataSegmentLength);
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
(hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
payload_length);
/*
* This is not a response to a Unsolicited NopIN, which means
* it can either be a NOPOUT ping request (with a valid ITT),
* or a NOPOUT not requesting a NOPIN (with a reserved ITT).
* Either way, make sure we allocate an struct iscsi_cmd, as both
* can contain ping data.
*/
if (hdr->ttt == 0xFFFFFFFF) {
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
return iscsit_add_reject(
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1, buf, conn);
cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
cmd->i_state = ISTATE_SEND_NOPIN;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1 : 0);
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = hdr->cmdsn;
cmd->exp_stat_sn = hdr->exp_statsn;
cmd->data_direction = DMA_NONE;
}
if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
rx_size = payload_length;
ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
if (!ping_data) {
pr_err("Unable to allocate memory for"
" NOPOUT ping data.\n");
ret = -1;
goto out;
}
iov = &cmd->iov_misc[0];
iov[niov].iov_base = ping_data;
iov[niov++].iov_len = payload_length;
padding = ((-payload_length) & 3);
if (padding != 0) {
pr_debug("Receiving %u additional bytes"
" for padding.\n", padding);
iov[niov].iov_base = &cmd->pad_bytes;
iov[niov++].iov_len = padding;
rx_size += padding;
}
if (conn->conn_ops->DataDigest) {
iov[niov].iov_base = &checksum;
iov[niov++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
if (rx_got != rx_size) {
ret = -1;
goto out;
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
ping_data, payload_length,
padding, cmd->pad_bytes,
(u8 *)&data_crc);
if (checksum != data_crc) {
pr_err("Ping data CRC32C DataDigest"
" 0x%08x does not match computed 0x%08x\n",
checksum, data_crc);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to recover from"
" NOPOUT Ping DataCRC failure while in"
" ERL=0.\n");
ret = -1;
goto out;
} else {
/*
* Silently drop this PDU and let the
* initiator plug the CmdSN gap.
*/
pr_debug("Dropping NOPOUT"
" Command CmdSN: 0x%08x due to"
" DataCRC error.\n", hdr->cmdsn);
ret = 0;
goto out;
}
} else {
pr_debug("Got CRC32C DataDigest"
" 0x%08x for %u bytes of ping data.\n",
checksum, payload_length);
}
}
ping_data[payload_length] = '\0';
/*
* Attach ping data to struct iscsi_cmd->buf_ptr.
*/
cmd->buf_ptr = ping_data;
cmd->buf_ptr_size = payload_length;
pr_debug("Got %u bytes of NOPOUT ping"
" data.\n", payload_length);
pr_debug("Ping Data: \"%s\"\n", ping_data);
}
if (hdr->itt != 0xFFFFFFFF) {
if (!cmd) {
pr_err("Checking CmdSN for NOPOUT,"
" but cmd is NULL!\n");
return -1;
}
/*
* Initiator is expecting a NopIN ping reply,
*/
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
iscsit_add_cmd_to_response_queue(cmd, conn,
cmd->i_state);
return 0;
}
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
ret = 0;
goto ping_out;
}
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
return 0;
}
if (hdr->ttt != 0xFFFFFFFF) {
/*
* This was a response to a unsolicited NOPIN ping.
*/
cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
if (!cmd)
return -1;
iscsit_stop_nopin_response_timer(conn);
cmd->i_state = ISTATE_REMOVE;
iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
iscsit_start_nopin_timer(conn);
} else {
/*
* Initiator is not expecting a NOPIN is response.
* Just ignore for now.
*
* iSCSI v19-91 10.18
* "A NOP-OUT may also be used to confirm a changed
* ExpStatSN if another PDU will not be available
* for a long time."
*/
ret = 0;
goto out;
}
return 0;
out:
if (cmd)
iscsit_release_cmd(cmd);
ping_out:
kfree(ping_data);
return ret;
}
static int iscsit_handle_task_mgt_cmd(
struct iscsi_conn *conn,
unsigned char *buf)
{
struct iscsi_cmd *cmd;
struct se_tmr_req *se_tmr;
struct iscsi_tmr_req *tmr_req;
struct iscsi_tm *hdr;
u32 payload_length;
int out_of_order_cmdsn = 0;
int ret;
u8 function;
hdr = (struct iscsi_tm *) buf;
payload_length = ntoh24(hdr->dlength);
hdr->itt = be32_to_cpu(hdr->itt);
hdr->rtt = be32_to_cpu(hdr->rtt);
hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
function = hdr->flags;
pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
" 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
" 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
hdr->rtt, hdr->refcmdsn, conn->cid);
if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
(hdr->rtt != ISCSI_RESERVED_TAG))) {
pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
hdr->rtt = ISCSI_RESERVED_TAG;
}
if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
pr_err("Task Management Request TASK_REASSIGN not"
" issued as immediate command, bad iSCSI Initiator"
"implementation\n");
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
(hdr->refcmdsn != ISCSI_RESERVED_TAG))
hdr->refcmdsn = ISCSI_RESERVED_TAG;
cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
if (!cmd)
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1, buf, conn);
cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
cmd->i_state = ISTATE_SEND_TASKMGTRSP;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = hdr->cmdsn;
cmd->exp_stat_sn = hdr->exp_statsn;
se_tmr = cmd->se_cmd.se_tmr_req;
tmr_req = cmd->tmr_req;
/*
* Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
*/
if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
ret = iscsit_get_lun_for_tmr(cmd,
get_unaligned_le64(&hdr->lun));
if (ret < 0) {
cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
goto attach;
}
}
switch (function) {
case ISCSI_TM_FUNC_ABORT_TASK:
se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
goto attach;
}
break;
case ISCSI_TM_FUNC_ABORT_TASK_SET:
case ISCSI_TM_FUNC_CLEAR_ACA:
case ISCSI_TM_FUNC_CLEAR_TASK_SET:
case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
break;
case ISCSI_TM_FUNC_TARGET_WARM_RESET:
if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
goto attach;
}
break;
case ISCSI_TM_FUNC_TARGET_COLD_RESET:
if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
goto attach;
}
break;
case ISCSI_TM_FUNC_TASK_REASSIGN:
se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
/*
* Perform sanity checks on the ExpDataSN only if the
* TASK_REASSIGN was successful.
*/
if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
break;
if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
buf, cmd);
break;
default:
pr_err("Unknown TMR function: 0x%02x, protocol"
" error.\n", function);
cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
goto attach;
}
if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
(se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
se_tmr->call_transport = 1;
attach:
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
out_of_order_cmdsn = 1;
else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
return 0;
else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
}
iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
return 0;
/*
* Found the referenced task, send to transport for processing.
*/
if (se_tmr->call_transport)
return transport_generic_handle_tmr(&cmd->se_cmd);
/*
* Could not find the referenced LUN, task, or Task Management
* command not authorized or supported. Change state and
* let the tx_thread send the response.
*
* For connection recovery, this is also the default action for
* TMR TASK_REASSIGN.
*/
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
/* #warning FIXME: Support Text Command parameters besides SendTargets */
static int iscsit_handle_text_cmd(
struct iscsi_conn *conn,
unsigned char *buf)
{
char *text_ptr, *text_in;
int cmdsn_ret, niov = 0, rx_got, rx_size;
u32 checksum = 0, data_crc = 0, payload_length;
u32 padding = 0, pad_bytes = 0, text_length = 0;
struct iscsi_cmd *cmd;
struct kvec iov[3];
struct iscsi_text *hdr;
hdr = (struct iscsi_text *) buf;
payload_length = ntoh24(hdr->dlength);
hdr->itt = be32_to_cpu(hdr->itt);
hdr->ttt = be32_to_cpu(hdr->ttt);
hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
pr_err("Unable to accept text parameter length: %u"
"greater than MaxRecvDataSegmentLength %u.\n",
payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
" ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
hdr->exp_statsn, payload_length);
rx_size = text_length = payload_length;
if (text_length) {
text_in = kzalloc(text_length, GFP_KERNEL);
if (!text_in) {
pr_err("Unable to allocate memory for"
" incoming text parameters\n");
return -1;
}
memset(iov, 0, 3 * sizeof(struct kvec));
iov[niov].iov_base = text_in;
iov[niov++].iov_len = text_length;
padding = ((-payload_length) & 3);
if (padding != 0) {
iov[niov].iov_base = &pad_bytes;
iov[niov++].iov_len = padding;
rx_size += padding;
pr_debug("Receiving %u additional bytes"
" for padding.\n", padding);
}
if (conn->conn_ops->DataDigest) {
iov[niov].iov_base = &checksum;
iov[niov++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
rx_got = rx_data(conn, &iov[0], niov, rx_size);
if (rx_got != rx_size) {
kfree(text_in);
return -1;
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
text_in, text_length,
padding, (u8 *)&pad_bytes,
(u8 *)&data_crc);
if (checksum != data_crc) {
pr_err("Text data CRC32C DataDigest"
" 0x%08x does not match computed"
" 0x%08x\n", checksum, data_crc);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to recover from"
" Text Data digest failure while in"
" ERL=0.\n");
kfree(text_in);
return -1;
} else {
/*
* Silently drop this PDU and let the
* initiator plug the CmdSN gap.
*/
pr_debug("Dropping Text"
" Command CmdSN: 0x%08x due to"
" DataCRC error.\n", hdr->cmdsn);
kfree(text_in);
return 0;
}
} else {
pr_debug("Got CRC32C DataDigest"
" 0x%08x for %u bytes of text data.\n",
checksum, text_length);
}
}
text_in[text_length - 1] = '\0';
pr_debug("Successfully read %d bytes of text"
" data.\n", text_length);
if (strncmp("SendTargets", text_in, 11) != 0) {
pr_err("Received Text Data that is not"
" SendTargets, cannot continue.\n");
kfree(text_in);
return -1;
}
text_ptr = strchr(text_in, '=');
if (!text_ptr) {
pr_err("No \"=\" separator found in Text Data,"
" cannot continue.\n");
kfree(text_in);
return -1;
}
if (strncmp("=All", text_ptr, 4) != 0) {
pr_err("Unable to locate All value for"
" SendTargets key, cannot continue.\n");
kfree(text_in);
return -1;
}
/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
kfree(text_in);
}
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1, buf, conn);
cmd->iscsi_opcode = ISCSI_OP_TEXT;
cmd->i_state = ISTATE_SEND_TEXTRSP;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = hdr->cmdsn;
cmd->exp_stat_sn = hdr->exp_statsn;
cmd->data_direction = DMA_NONE;
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
return 0;
}
return iscsit_execute_cmd(cmd, 0);
}
int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_conn *conn_p;
struct iscsi_session *sess = conn->sess;
pr_debug("Received logout request CLOSESESSION on CID: %hu"
" for SID: %u.\n", conn->cid, conn->sess->sid);
atomic_set(&sess->session_logout, 1);
atomic_set(&conn->conn_logout_remove, 1);
conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
iscsit_inc_conn_usage_count(conn);
iscsit_inc_session_usage_count(sess);
spin_lock_bh(&sess->conn_lock);
list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
continue;
pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
}
spin_unlock_bh(&sess->conn_lock);
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_conn *l_conn;
struct iscsi_session *sess = conn->sess;
pr_debug("Received logout request CLOSECONNECTION for CID:"
" %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
/*
* A Logout Request with a CLOSECONNECTION reason code for a CID
* can arrive on a connection with a differing CID.
*/
if (conn->cid == cmd->logout_cid) {
spin_lock_bh(&conn->state_lock);
pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
atomic_set(&conn->conn_logout_remove, 1);
conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
iscsit_inc_conn_usage_count(conn);
spin_unlock_bh(&conn->state_lock);
} else {
/*
* Handle all different cid CLOSECONNECTION requests in
* iscsit_logout_post_handler_diffcid() as to give enough
* time for any non immediate command's CmdSN to be
* acknowledged on the connection in question.
*
* Here we simply make sure the CID is still around.
*/
l_conn = iscsit_get_conn_from_cid(sess,
cmd->logout_cid);
if (!l_conn) {
cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
iscsit_add_cmd_to_response_queue(cmd, conn,
cmd->i_state);
return 0;
}
iscsit_dec_conn_usage_count(l_conn);
}
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_session *sess = conn->sess;
pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
" CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
if (sess->sess_ops->ErrorRecoveryLevel != 2) {
pr_err("Received Logout Request REMOVECONNFORRECOVERY"
" while ERL!=2.\n");
cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
if (conn->cid == cmd->logout_cid) {
pr_err("Received Logout Request REMOVECONNFORRECOVERY"
" with CID: %hu on CID: %hu, implementation error.\n",
cmd->logout_cid, conn->cid);
cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
static int iscsit_handle_logout_cmd(
struct iscsi_conn *conn,
unsigned char *buf)
{
int cmdsn_ret, logout_remove = 0;
u8 reason_code = 0;
struct iscsi_cmd *cmd;
struct iscsi_logout *hdr;
struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
hdr = (struct iscsi_logout *) buf;
reason_code = (hdr->flags & 0x7f);
hdr->itt = be32_to_cpu(hdr->itt);
hdr->cid = be16_to_cpu(hdr->cid);
hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
if (tiqn) {
spin_lock(&tiqn->logout_stats.lock);
if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
tiqn->logout_stats.normal_logouts++;
else
tiqn->logout_stats.abnormal_logouts++;
spin_unlock(&tiqn->logout_stats.lock);
}
pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
" ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
hdr->cid, conn->cid);
if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
pr_err("Received logout request on connection that"
" is not in logged in state, ignoring request.\n");
return 0;
}
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
buf, conn);
cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
cmd->i_state = ISTATE_SEND_LOGOUTRSP;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = hdr->cmdsn;
cmd->exp_stat_sn = hdr->exp_statsn;
cmd->logout_cid = hdr->cid;
cmd->logout_reason = reason_code;
cmd->data_direction = DMA_NONE;
/*
* We need to sleep in these cases (by returning 1) until the Logout
* Response gets sent in the tx thread.
*/
if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
(hdr->cid == conn->cid)))
logout_remove = 1;
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
/*
* Immediate commands are executed, well, immediately.
* Non-Immediate Logout Commands are executed in CmdSN order.
*/
if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
int ret = iscsit_execute_cmd(cmd, 0);
if (ret < 0)
return ret;
} else {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
logout_remove = 0;
} else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
}
}
return logout_remove;
}
static int iscsit_handle_snack(
struct iscsi_conn *conn,
unsigned char *buf)
{
u32 unpacked_lun;
u64 lun;
struct iscsi_snack *hdr;
hdr = (struct iscsi_snack *) buf;
hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
lun = get_unaligned_le64(&hdr->lun);
unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
hdr->itt = be32_to_cpu(hdr->itt);
hdr->ttt = be32_to_cpu(hdr->ttt);
hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
hdr->begrun = be32_to_cpu(hdr->begrun);
hdr->runlength = be32_to_cpu(hdr->runlength);
pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
" 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
" CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
hdr->begrun, hdr->runlength, conn->cid);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Initiator sent SNACK request while in"
" ErrorRecoveryLevel=0.\n");
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
/*
* SNACK_DATA and SNACK_R2T are both 0, so check which function to
* call from inside iscsi_send_recovery_datain_or_r2t().
*/
switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
case 0:
return iscsit_handle_recovery_datain_or_r2t(conn, buf,
hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
case ISCSI_FLAG_SNACK_TYPE_STATUS:
return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
hdr->begrun, hdr->runlength);
case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
hdr->runlength);
case ISCSI_FLAG_SNACK_TYPE_RDATA:
/* FIXME: Support R-Data SNACK */
pr_err("R-Data SNACK Not Supported.\n");
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
default:
pr_err("Unknown SNACK type 0x%02x, protocol"
" error.\n", hdr->flags & 0x0f);
return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buf, conn);
}
return 0;
}
static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
{
if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
(conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
wait_for_completion_interruptible_timeout(
&conn->rx_half_close_comp,
ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
}
}
static int iscsit_handle_immediate_data(
struct iscsi_cmd *cmd,
unsigned char *buf,
u32 length)
{
int iov_ret, rx_got = 0, rx_size = 0;
u32 checksum, iov_count = 0, padding = 0;
struct iscsi_conn *conn = cmd->conn;
struct kvec *iov;
iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
if (iov_ret < 0)
return IMMEDIATE_DATA_CANNOT_RECOVER;
rx_size = length;
iov_count = iov_ret;
iov = &cmd->iov_data[0];
padding = ((-length) & 3);
if (padding != 0) {
iov[iov_count].iov_base = cmd->pad_bytes;
iov[iov_count++].iov_len = padding;
rx_size += padding;
}
if (conn->conn_ops->DataDigest) {
iov[iov_count].iov_base = &checksum;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
iscsit_unmap_iovec(cmd);
if (rx_got != rx_size) {
iscsit_rx_thread_wait_for_tcp(conn);
return IMMEDIATE_DATA_CANNOT_RECOVER;
}
if (conn->conn_ops->DataDigest) {
u32 data_crc;
data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
cmd->write_data_done, length, padding,
cmd->pad_bytes);
if (checksum != data_crc) {
pr_err("ImmediateData CRC32C DataDigest 0x%08x"
" does not match computed 0x%08x\n", checksum,
data_crc);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to recover from"
" Immediate Data digest failure while"
" in ERL=0.\n");
iscsit_add_reject_from_cmd(
ISCSI_REASON_DATA_DIGEST_ERROR,
1, 0, buf, cmd);
return IMMEDIATE_DATA_CANNOT_RECOVER;
} else {
iscsit_add_reject_from_cmd(
ISCSI_REASON_DATA_DIGEST_ERROR,
0, 0, buf, cmd);
return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
}
} else {
pr_debug("Got CRC32C DataDigest 0x%08x for"
" %u bytes of Immediate Data\n", checksum,
length);
}
}
cmd->write_data_done += length;
if (cmd->write_data_done == cmd->data_length) {
spin_lock_bh(&cmd->istate_lock);
cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
spin_unlock_bh(&cmd->istate_lock);
}
return IMMEDIATE_DATA_NORMAL_OPERATION;
}
/*
* Called with sess->conn_lock held.
*/
/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
with active network interface */
static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
{
struct iscsi_cmd *cmd;
struct iscsi_conn *conn_p;
/*
* Only send a Asynchronous Message on connections whos network
* interface is still functional.
*/
list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
iscsit_inc_conn_usage_count(conn_p);
break;
}
}
if (!conn_p)
return;
cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
if (!cmd) {
iscsit_dec_conn_usage_count(conn_p);
return;
}
cmd->logout_cid = conn->cid;
cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
cmd->i_state = ISTATE_SEND_ASYNCMSG;
spin_lock_bh(&conn_p->cmd_lock);
list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
spin_unlock_bh(&conn_p->cmd_lock);
iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
iscsit_dec_conn_usage_count(conn_p);
}
static int iscsit_send_conn_drop_async_message(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_async *hdr;
cmd->tx_size = ISCSI_HDR_LEN;
cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
hdr = (struct iscsi_async *) cmd->pdu;
hdr->opcode = ISCSI_OP_ASYNC_EVENT;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
cmd->init_task_tag = 0xFFFFFFFF;
cmd->targ_xfer_tag = 0xFFFFFFFF;
put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
hdr->param1 = cpu_to_be16(cmd->logout_cid);
hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
cmd->tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32C HeaderDigest to"
" Async Message 0x%08x\n", *header_digest);
}
cmd->iov_misc[0].iov_base = cmd->pdu;
cmd->iov_misc[0].iov_len = cmd->tx_size;
cmd->iov_misc_count = 1;
pr_debug("Sending Connection Dropped Async Message StatSN:"
" 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
cmd->logout_cid, conn->cid);
return 0;
}
static int iscsit_send_data_in(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn,
int *eodr)
{
int iov_ret = 0, set_statsn = 0;
u32 iov_count = 0, tx_size = 0;
struct iscsi_datain datain;
struct iscsi_datain_req *dr;
struct iscsi_data_rsp *hdr;
struct kvec *iov;
memset(&datain, 0, sizeof(struct iscsi_datain));
dr = iscsit_get_datain_values(cmd, &datain);
if (!dr) {
pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
cmd->init_task_tag);
return -1;
}
/*
* Be paranoid and double check the logic for now.
*/
if ((datain.offset + datain.length) > cmd->data_length) {
pr_err("Command ITT: 0x%08x, datain.offset: %u and"
" datain.length: %u exceeds cmd->data_length: %u\n",
cmd->init_task_tag, datain.offset, datain.length,
cmd->data_length);
return -1;
}
spin_lock_bh(&conn->sess->session_stats_lock);
conn->sess->tx_data_octets += datain.length;
if (conn->sess->se_sess->se_node_acl) {
spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
}
spin_unlock_bh(&conn->sess->session_stats_lock);
/*
* Special case for successfully execution w/ both DATAIN
* and Sense Data.
*/
if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
(cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
else {
if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
(dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
iscsit_increment_maxcmdsn(cmd, conn->sess);
cmd->stat_sn = conn->stat_sn++;
set_statsn = 1;
} else if (dr->dr_complete ==
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
set_statsn = 1;
}
hdr = (struct iscsi_data_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
hdr->flags = datain.flags;
if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
}
}
hton24(hdr->dlength, datain.length);
if (hdr->flags & ISCSI_FLAG_DATA_ACK)
int_to_scsilun(cmd->se_cmd.orig_fe_lun,
(struct scsi_lun *)&hdr->lun);
else
put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
hdr->itt = cpu_to_be32(cmd->init_task_tag);
hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
cpu_to_be32(cmd->targ_xfer_tag) :
0xFFFFFFFF;
hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
0xFFFFFFFF;
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
hdr->datasn = cpu_to_be32(datain.data_sn);
hdr->offset = cpu_to_be32(datain.offset);
iov = &cmd->iov_data[0];
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
tx_size += ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 HeaderDigest"
" for DataIN PDU 0x%08x\n", *header_digest);
}
iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
if (iov_ret < 0)
return -1;
iov_count += iov_ret;
tx_size += datain.length;
cmd->padding = ((-datain.length) & 3);
if (cmd->padding) {
iov[iov_count].iov_base = cmd->pad_bytes;
iov[iov_count++].iov_len = cmd->padding;
tx_size += cmd->padding;
pr_debug("Attaching %u padding bytes\n",
cmd->padding);
}
if (conn->conn_ops->DataDigest) {
cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
iov[iov_count].iov_base = &cmd->data_crc;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attached CRC32C DataDigest %d bytes, crc"
" 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
}
cmd->iov_data_count = iov_count;
cmd->tx_size = tx_size;
pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
ntohl(hdr->offset), datain.length, conn->cid);
if (dr->dr_complete) {
*eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2 : 1;
iscsit_free_datain_req(cmd, dr);
}
return 0;
}
static int iscsit_send_logout_response(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
int niov = 0, tx_size;
struct iscsi_conn *logout_conn = NULL;
struct iscsi_conn_recovery *cr = NULL;
struct iscsi_session *sess = conn->sess;
struct kvec *iov;
struct iscsi_logout_rsp *hdr;
/*
* The actual shutting down of Sessions and/or Connections
* for CLOSESESSION and CLOSECONNECTION Logout Requests
* is done in scsi_logout_post_handler().
*/
switch (cmd->logout_reason) {
case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
pr_debug("iSCSI session logout successful, setting"
" logout response to ISCSI_LOGOUT_SUCCESS.\n");
cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
break;
case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
break;
/*
* For CLOSECONNECTION logout requests carrying
* a matching logout CID -> local CID, the reference
* for the local CID will have been incremented in
* iscsi_logout_closeconnection().
*
* For CLOSECONNECTION logout requests carrying
* a different CID than the connection it arrived
* on, the connection responding to cmd->logout_cid
* is stopped in iscsit_logout_post_handler_diffcid().
*/
pr_debug("iSCSI CID: %hu logout on CID: %hu"
" successful.\n", cmd->logout_cid, conn->cid);
cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
break;
case ISCSI_LOGOUT_REASON_RECOVERY:
if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
(cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
break;
/*
* If the connection is still active from our point of view
* force connection recovery to occur.
*/
logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
cmd->logout_cid);
if ((logout_conn)) {
iscsit_connection_reinstatement_rcfr(logout_conn);
iscsit_dec_conn_usage_count(logout_conn);
}
cr = iscsit_get_inactive_connection_recovery_entry(
conn->sess, cmd->logout_cid);
if (!cr) {
pr_err("Unable to locate CID: %hu for"
" REMOVECONNFORRECOVERY Logout Request.\n",
cmd->logout_cid);
cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
break;
}
iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
" for recovery for CID: %hu on CID: %hu successful.\n",
cmd->logout_cid, conn->cid);
cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
break;
default:
pr_err("Unknown cmd->logout_reason: 0x%02x\n",
cmd->logout_reason);
return -1;
}
tx_size = ISCSI_HDR_LEN;
hdr = (struct iscsi_logout_rsp *)cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_LOGOUT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hdr->response = cmd->logout_response;
hdr->itt = cpu_to_be32(cmd->init_task_tag);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
iov = &cmd->iov_misc[0];
iov[niov].iov_base = cmd->pdu;
iov[niov++].iov_len = ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32C HeaderDigest to"
" Logout Response 0x%08x\n", *header_digest);
}
cmd->iov_misc_count = niov;
cmd->tx_size = tx_size;
pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
" 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
cmd->init_task_tag, cmd->stat_sn, hdr->response,
cmd->logout_cid, conn->cid);
return 0;
}
/*
* Unsolicited NOPIN, either requesting a response or not.
*/
static int iscsit_send_unsolicited_nopin(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn,
int want_response)
{
int tx_size = ISCSI_HDR_LEN;
struct iscsi_nopin *hdr;
hdr = (struct iscsi_nopin *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_NOOP_IN;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hdr->itt = cpu_to_be32(cmd->init_task_tag);
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = conn->stat_sn;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32C HeaderDigest to"
" NopIN 0x%08x\n", *header_digest);
}
cmd->iov_misc[0].iov_base = cmd->pdu;
cmd->iov_misc[0].iov_len = tx_size;
cmd->iov_misc_count = 1;
cmd->tx_size = tx_size;
pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
" 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
return 0;
}
static int iscsit_send_nopin_response(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
int niov = 0, tx_size;
u32 padding = 0;
struct kvec *iov;
struct iscsi_nopin *hdr;
tx_size = ISCSI_HDR_LEN;
hdr = (struct iscsi_nopin *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_NOOP_IN;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, cmd->buf_ptr_size);
put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
hdr->itt = cpu_to_be32(cmd->init_task_tag);
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
iov = &cmd->iov_misc[0];
iov[niov].iov_base = cmd->pdu;
iov[niov++].iov_len = ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32C HeaderDigest"
" to NopIn 0x%08x\n", *header_digest);
}
/*
* NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
* NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
*/
if (cmd->buf_ptr_size) {
iov[niov].iov_base = cmd->buf_ptr;
iov[niov++].iov_len = cmd->buf_ptr_size;
tx_size += cmd->buf_ptr_size;
pr_debug("Echoing back %u bytes of ping"
" data.\n", cmd->buf_ptr_size);
padding = ((-cmd->buf_ptr_size) & 3);
if (padding != 0) {
iov[niov].iov_base = &cmd->pad_bytes;
iov[niov++].iov_len = padding;
tx_size += padding;
pr_debug("Attaching %u additional"
" padding bytes.\n", padding);
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
cmd->buf_ptr, cmd->buf_ptr_size,
padding, (u8 *)&cmd->pad_bytes,
(u8 *)&cmd->data_crc);
iov[niov].iov_base = &cmd->data_crc;
iov[niov++].iov_len = ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attached DataDigest for %u"
" bytes of ping data, CRC 0x%08x\n",
cmd->buf_ptr_size, cmd->data_crc);
}
}
cmd->iov_misc_count = niov;
cmd->tx_size = tx_size;
pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
" 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
return 0;
}
int iscsit_send_r2t(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
int tx_size = 0;
struct iscsi_r2t *r2t;
struct iscsi_r2t_rsp *hdr;
r2t = iscsit_get_r2t_from_list(cmd);
if (!r2t)
return -1;
hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_R2T;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
int_to_scsilun(cmd->se_cmd.orig_fe_lun,
(struct scsi_lun *)&hdr->lun);
hdr->itt = cpu_to_be32(cmd->init_task_tag);
spin_lock_bh(&conn->sess->ttt_lock);
r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
if (r2t->targ_xfer_tag == 0xFFFFFFFF)
r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
spin_unlock_bh(&conn->sess->ttt_lock);
hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
hdr->statsn = cpu_to_be32(conn->stat_sn);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
hdr->data_offset = cpu_to_be32(r2t->offset);
hdr->data_length = cpu_to_be32(r2t->xfer_len);
cmd->iov_misc[0].iov_base = cmd->pdu;
cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
tx_size += ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 HeaderDigest for R2T"
" PDU 0x%08x\n", *header_digest);
}
pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
" 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
(!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
r2t->offset, r2t->xfer_len, conn->cid);
cmd->iov_misc_count = 1;
cmd->tx_size = tx_size;
spin_lock_bh(&cmd->r2t_lock);
r2t->sent_r2t = 1;
spin_unlock_bh(&cmd->r2t_lock);
return 0;
}
/*
* type 0: Normal Operation.
* type 1: Called from Storage Transport.
* type 2: Called from iscsi_task_reassign_complete_write() for
* connection recovery.
*/
int iscsit_build_r2ts_for_cmd(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn,
int type)
{
int first_r2t = 1;
u32 offset = 0, xfer_len = 0;
spin_lock_bh(&cmd->r2t_lock);
if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
spin_unlock_bh(&cmd->r2t_lock);
return 0;
}
if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
if (cmd->r2t_offset < cmd->write_data_done)
cmd->r2t_offset = cmd->write_data_done;
while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
if (conn->sess->sess_ops->DataSequenceInOrder) {
offset = cmd->r2t_offset;
if (first_r2t && (type == 2)) {
xfer_len = ((offset +
(conn->sess->sess_ops->MaxBurstLength -
cmd->next_burst_len) >
cmd->data_length) ?
(cmd->data_length - offset) :
(conn->sess->sess_ops->MaxBurstLength -
cmd->next_burst_len));
} else {
xfer_len = ((offset +
conn->sess->sess_ops->MaxBurstLength) >
cmd->data_length) ?
(cmd->data_length - offset) :
conn->sess->sess_ops->MaxBurstLength;
}
cmd->r2t_offset += xfer_len;
if (cmd->r2t_offset == cmd->data_length)
cmd->cmd_flags |= ICF_SENT_LAST_R2T;
} else {
struct iscsi_seq *seq;
seq = iscsit_get_seq_holder_for_r2t(cmd);
if (!seq) {
spin_unlock_bh(&cmd->r2t_lock);
return -1;
}
offset = seq->offset;
xfer_len = seq->xfer_len;
if (cmd->seq_send_order == cmd->seq_count)
cmd->cmd_flags |= ICF_SENT_LAST_R2T;
}
cmd->outstanding_r2ts++;
first_r2t = 0;
if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
spin_unlock_bh(&cmd->r2t_lock);
return -1;
}
if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
break;
}
spin_unlock_bh(&cmd->r2t_lock);
return 0;
}
static int iscsit_send_status(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
u8 iov_count = 0, recovery;
u32 padding = 0, tx_size = 0;
struct iscsi_scsi_rsp *hdr;
struct kvec *iov;
recovery = (cmd->i_state != ISTATE_SEND_STATUS);
if (!recovery)
cmd->stat_sn = conn->stat_sn++;
spin_lock_bh(&conn->sess->session_stats_lock);
conn->sess->rsp_pdus++;
spin_unlock_bh(&conn->sess->session_stats_lock);
hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
}
hdr->response = cmd->iscsi_response;
hdr->cmd_status = cmd->se_cmd.scsi_status;
hdr->itt = cpu_to_be32(cmd->init_task_tag);
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
iov = &cmd->iov_misc[0];
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
tx_size += ISCSI_HDR_LEN;
/*
* Attach SENSE DATA payload to iSCSI Response PDU
*/
if (cmd->se_cmd.sense_buffer &&
((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
(cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
padding = -(cmd->se_cmd.scsi_sense_length) & 3;
hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
iov[iov_count++].iov_len =
(cmd->se_cmd.scsi_sense_length + padding);
tx_size += cmd->se_cmd.scsi_sense_length;
if (padding) {
memset(cmd->se_cmd.sense_buffer +
cmd->se_cmd.scsi_sense_length, 0, padding);
tx_size += padding;
pr_debug("Adding %u bytes of padding to"
" SENSE.\n", padding);
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
cmd->se_cmd.sense_buffer,
(cmd->se_cmd.scsi_sense_length + padding),
0, NULL, (u8 *)&cmd->data_crc);
iov[iov_count].iov_base = &cmd->data_crc;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 DataDigest for"
" SENSE, %u bytes CRC 0x%08x\n",
(cmd->se_cmd.scsi_sense_length + padding),
cmd->data_crc);
}
pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
" Response PDU\n",
cmd->se_cmd.scsi_sense_length);
}
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 HeaderDigest for Response"
" PDU 0x%08x\n", *header_digest);
}
cmd->iov_misc_count = iov_count;
cmd->tx_size = tx_size;
pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
" Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
(!recovery) ? "" : "Recovery ", cmd->init_task_tag,
cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
return 0;
}
static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
{
switch (se_tmr->response) {
case TMR_FUNCTION_COMPLETE:
return ISCSI_TMF_RSP_COMPLETE;
case TMR_TASK_DOES_NOT_EXIST:
return ISCSI_TMF_RSP_NO_TASK;
case TMR_LUN_DOES_NOT_EXIST:
return ISCSI_TMF_RSP_NO_LUN;
case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
return ISCSI_TMF_RSP_NOT_SUPPORTED;
case TMR_FUNCTION_AUTHORIZATION_FAILED:
return ISCSI_TMF_RSP_AUTH_FAILED;
case TMR_FUNCTION_REJECTED:
default:
return ISCSI_TMF_RSP_REJECTED;
}
}
static int iscsit_send_task_mgt_rsp(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
struct iscsi_tm_rsp *hdr;
u32 tx_size = 0;
hdr = (struct iscsi_tm_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
hdr->itt = cpu_to_be32(cmd->init_task_tag);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
cmd->iov_misc[0].iov_base = cmd->pdu;
cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
tx_size += ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 HeaderDigest for Task"
" Mgmt Response PDU 0x%08x\n", *header_digest);
}
cmd->iov_misc_count = 1;
cmd->tx_size = tx_size;
pr_debug("Built Task Management Response ITT: 0x%08x,"
" StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
return 0;
}
static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
{
char *payload = NULL;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_portal_group *tpg;
struct iscsi_tiqn *tiqn;
struct iscsi_tpg_np *tpg_np;
int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
unsigned char buf[256];
buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
32768 : conn->conn_ops->MaxRecvDataSegmentLength;
memset(buf, 0, 256);
payload = kzalloc(buffer_len, GFP_KERNEL);
if (!payload) {
pr_err("Unable to allocate memory for sendtargets"
" response.\n");
return -ENOMEM;
}
spin_lock(&tiqn_lock);
list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
len += 1;
if ((len + payload_len) > buffer_len) {
spin_unlock(&tiqn->tiqn_tpg_lock);
end_of_buf = 1;
goto eob;
}
memcpy(payload + payload_len, buf, len);
payload_len += len;
spin_lock(&tiqn->tiqn_tpg_lock);
list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
spin_lock(&tpg->tpg_state_lock);
if ((tpg->tpg_state == TPG_STATE_FREE) ||
(tpg->tpg_state == TPG_STATE_INACTIVE)) {
spin_unlock(&tpg->tpg_state_lock);
continue;
}
spin_unlock(&tpg->tpg_state_lock);
spin_lock(&tpg->tpg_np_lock);
list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
tpg_np_list) {
len = sprintf(buf, "TargetAddress="
"%s%s%s:%hu,%hu",
(tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
"[" : "", tpg_np->tpg_np->np_ip,
(tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
"]" : "", tpg_np->tpg_np->np_port,
tpg->tpgt);
len += 1;
if ((len + payload_len) > buffer_len) {
spin_unlock(&tpg->tpg_np_lock);
spin_unlock(&tiqn->tiqn_tpg_lock);
end_of_buf = 1;
goto eob;
}
memcpy(payload + payload_len, buf, len);
payload_len += len;
}
spin_unlock(&tpg->tpg_np_lock);
}
spin_unlock(&tiqn->tiqn_tpg_lock);
eob:
if (end_of_buf)
break;
}
spin_unlock(&tiqn_lock);
cmd->buf_ptr = payload;
return payload_len;
}
/*
* FIXME: Add support for F_BIT and C_BIT when the length is longer than
* MaxRecvDataSegmentLength.
*/
static int iscsit_send_text_rsp(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_text_rsp *hdr;
struct kvec *iov;
u32 padding = 0, tx_size = 0;
int text_length, iov_count = 0;
text_length = iscsit_build_sendtargets_response(cmd);
if (text_length < 0)
return text_length;
padding = ((-text_length) & 3);
if (padding != 0) {
memset(cmd->buf_ptr + text_length, 0, padding);
pr_debug("Attaching %u additional bytes for"
" padding.\n", padding);
}
hdr = (struct iscsi_text_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_TEXT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, text_length);
hdr->itt = cpu_to_be32(cmd->init_task_tag);
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
iov = &cmd->iov_misc[0];
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
iov[iov_count].iov_base = cmd->buf_ptr;
iov[iov_count++].iov_len = text_length + padding;
tx_size += (ISCSI_HDR_LEN + text_length + padding);
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 HeaderDigest for"
" Text Response PDU 0x%08x\n", *header_digest);
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
cmd->buf_ptr, (text_length + padding),
0, NULL, (u8 *)&cmd->data_crc);
iov[iov_count].iov_base = &cmd->data_crc;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching DataDigest for %u bytes of text"
" data, CRC 0x%08x\n", (text_length + padding),
cmd->data_crc);
}
cmd->iov_misc_count = iov_count;
cmd->tx_size = tx_size;
pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
" Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
text_length, conn->cid);
return 0;
}
static int iscsit_send_reject(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
u32 iov_count = 0, tx_size = 0;
struct iscsi_reject *hdr;
struct kvec *iov;
hdr = (struct iscsi_reject *) cmd->pdu;
hdr->opcode = ISCSI_OP_REJECT;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, ISCSI_HDR_LEN);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
iov = &cmd->iov_misc[0];
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
iov[iov_count].iov_base = cmd->buf_ptr;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)hdr, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 HeaderDigest for"
" REJECT PDU 0x%08x\n", *header_digest);
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
(unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
0, NULL, (u8 *)&cmd->data_crc);
iov[iov_count].iov_base = &cmd->data_crc;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 DataDigest for REJECT"
" PDU 0x%08x\n", cmd->data_crc);
}
cmd->iov_misc_count = iov_count;
cmd->tx_size = tx_size;
pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
" CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
return 0;
}
static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
{
if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
(conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
wait_for_completion_interruptible_timeout(
&conn->tx_half_close_comp,
ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
}
}
#ifdef CONFIG_SMP
void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
{
struct iscsi_thread_set *ts = conn->thread_set;
int ord, cpu;
/*
* thread_id is assigned from iscsit_global->ts_bitmap from
* within iscsi_thread_set.c:iscsi_allocate_thread_sets()
*
* Here we use thread_id to determine which CPU that this
* iSCSI connection's iscsi_thread_set will be scheduled to
* execute upon.
*/
ord = ts->thread_id % cpumask_weight(cpu_online_mask);
#if 0
pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
" thread_id: %d\n", ord, ts->thread_id);
#endif
for_each_online_cpu(cpu) {
if (ord-- == 0) {
cpumask_set_cpu(cpu, conn->conn_cpumask);
return;
}
}
/*
* This should never be reached..
*/
dump_stack();
cpumask_setall(conn->conn_cpumask);
}
static inline void iscsit_thread_check_cpumask(
struct iscsi_conn *conn,
struct task_struct *p,
int mode)
{
char buf[128];
/*
* mode == 1 signals iscsi_target_tx_thread() usage.
* mode == 0 signals iscsi_target_rx_thread() usage.
*/
if (mode == 1) {
if (!conn->conn_tx_reset_cpumask)
return;
conn->conn_tx_reset_cpumask = 0;
} else {
if (!conn->conn_rx_reset_cpumask)
return;
conn->conn_rx_reset_cpumask = 0;
}
/*
* Update the CPU mask for this single kthread so that
* both TX and RX kthreads are scheduled to run on the
* same CPU.
*/
memset(buf, 0, 128);
cpumask_scnprintf(buf, 128, conn->conn_cpumask);
#if 0
pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
" %s for %s\n", buf, p->comm);
#endif
set_cpus_allowed_ptr(p, conn->conn_cpumask);
}
#else
void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
{
return;
}
#define iscsit_thread_check_cpumask(X, Y, Z) ({})
#endif /* CONFIG_SMP */
int iscsi_target_tx_thread(void *arg)
{
u8 state;
int eodr = 0;
int ret = 0;
int sent_status = 0;
int use_misc = 0;
int map_sg = 0;
struct iscsi_cmd *cmd = NULL;
struct iscsi_conn *conn;
struct iscsi_queue_req *qr = NULL;
struct se_cmd *se_cmd;
struct iscsi_thread_set *ts = arg;
/*
* Allow ourselves to be interrupted by SIGINT so that a
* connection recovery / failure event can be triggered externally.
*/
allow_signal(SIGINT);
restart:
conn = iscsi_tx_thread_pre_handler(ts);
if (!conn)
goto out;
eodr = map_sg = ret = sent_status = use_misc = 0;
while (!kthread_should_stop()) {
/*
* Ensure that both TX and RX per connection kthreads
* are scheduled to run on the same CPU.
*/
iscsit_thread_check_cpumask(conn, current, 1);
schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
if ((ts->status == ISCSI_THREAD_SET_RESET) ||
signal_pending(current))
goto transport_err;
get_immediate:
qr = iscsit_get_cmd_from_immediate_queue(conn);
if (qr) {
atomic_set(&conn->check_immediate_queue, 0);
cmd = qr->cmd;
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);
spin_lock_bh(&cmd->istate_lock);
switch (state) {
case ISTATE_SEND_R2T:
spin_unlock_bh(&cmd->istate_lock);
ret = iscsit_send_r2t(cmd, conn);
break;
case ISTATE_REMOVE:
spin_unlock_bh(&cmd->istate_lock);
if (cmd->data_direction == DMA_TO_DEVICE)
iscsit_stop_dataout_timer(cmd);
spin_lock_bh(&conn->cmd_lock);
list_del(&cmd->i_list);
spin_unlock_bh(&conn->cmd_lock);
iscsit_free_cmd(cmd);
goto get_immediate;
case ISTATE_SEND_NOPIN_WANT_RESPONSE:
spin_unlock_bh(&cmd->istate_lock);
iscsit_mod_nopin_response_timer(conn);
ret = iscsit_send_unsolicited_nopin(cmd,
conn, 1);
break;
case ISTATE_SEND_NOPIN_NO_RESPONSE:
spin_unlock_bh(&cmd->istate_lock);
ret = iscsit_send_unsolicited_nopin(cmd,
conn, 0);
break;
default:
pr_err("Unknown Opcode: 0x%02x ITT:"
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag, state,
conn->cid);
spin_unlock_bh(&cmd->istate_lock);
goto transport_err;
}
if (ret < 0) {
conn->tx_immediate_queue = 0;
goto transport_err;
}
if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
conn->tx_immediate_queue = 0;
iscsit_tx_thread_wait_for_tcp(conn);
goto transport_err;
}
spin_lock_bh(&cmd->istate_lock);
switch (state) {
case ISTATE_SEND_R2T:
spin_unlock_bh(&cmd->istate_lock);
spin_lock_bh(&cmd->dataout_timeout_lock);
iscsit_start_dataout_timer(cmd, conn);
spin_unlock_bh(&cmd->dataout_timeout_lock);
break;
case ISTATE_SEND_NOPIN_WANT_RESPONSE:
cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
spin_unlock_bh(&cmd->istate_lock);
break;
case ISTATE_SEND_NOPIN_NO_RESPONSE:
cmd->i_state = ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
break;
default:
pr_err("Unknown Opcode: 0x%02x ITT:"
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag,
state, conn->cid);
spin_unlock_bh(&cmd->istate_lock);
goto transport_err;
}
goto get_immediate;
} else
conn->tx_immediate_queue = 0;
get_response:
qr = iscsit_get_cmd_from_response_queue(conn);
if (qr) {
cmd = qr->cmd;
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);
spin_lock_bh(&cmd->istate_lock);
check_rsp_state:
switch (state) {
case ISTATE_SEND_DATAIN:
spin_unlock_bh(&cmd->istate_lock);
ret = iscsit_send_data_in(cmd, conn,
&eodr);
map_sg = 1;
break;
case ISTATE_SEND_STATUS:
case ISTATE_SEND_STATUS_RECOVERY:
spin_unlock_bh(&cmd->istate_lock);
use_misc = 1;
ret = iscsit_send_status(cmd, conn);
break;
case ISTATE_SEND_LOGOUTRSP:
spin_unlock_bh(&cmd->istate_lock);
use_misc = 1;
ret = iscsit_send_logout_response(cmd, conn);
break;
case ISTATE_SEND_ASYNCMSG:
spin_unlock_bh(&cmd->istate_lock);
use_misc = 1;
ret = iscsit_send_conn_drop_async_message(
cmd, conn);
break;
case ISTATE_SEND_NOPIN:
spin_unlock_bh(&cmd->istate_lock);
use_misc = 1;
ret = iscsit_send_nopin_response(cmd, conn);
break;
case ISTATE_SEND_REJECT:
spin_unlock_bh(&cmd->istate_lock);
use_misc = 1;
ret = iscsit_send_reject(cmd, conn);
break;
case ISTATE_SEND_TASKMGTRSP:
spin_unlock_bh(&cmd->istate_lock);
use_misc = 1;
ret = iscsit_send_task_mgt_rsp(cmd, conn);
if (ret != 0)
break;
ret = iscsit_tmr_post_handler(cmd, conn);
if (ret != 0)
iscsit_fall_back_to_erl0(conn->sess);
break;
case ISTATE_SEND_TEXTRSP:
spin_unlock_bh(&cmd->istate_lock);
use_misc = 1;
ret = iscsit_send_text_rsp(cmd, conn);
break;
default:
pr_err("Unknown Opcode: 0x%02x ITT:"
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag,
state, conn->cid);
spin_unlock_bh(&cmd->istate_lock);
goto transport_err;
}
if (ret < 0) {
conn->tx_response_queue = 0;
goto transport_err;
}
se_cmd = &cmd->se_cmd;
if (map_sg && !conn->conn_ops->IFMarker) {
if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
conn->tx_response_queue = 0;
iscsit_tx_thread_wait_for_tcp(conn);
iscsit_unmap_iovec(cmd);
goto transport_err;
}
} else {
if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
conn->tx_response_queue = 0;
iscsit_tx_thread_wait_for_tcp(conn);
iscsit_unmap_iovec(cmd);
goto transport_err;
}
}
map_sg = 0;
iscsit_unmap_iovec(cmd);
spin_lock_bh(&cmd->istate_lock);
switch (state) {
case ISTATE_SEND_DATAIN:
if (!eodr)
goto check_rsp_state;
if (eodr == 1) {
cmd->i_state = ISTATE_SENT_LAST_DATAIN;
sent_status = 1;
eodr = use_misc = 0;
} else if (eodr == 2) {
cmd->i_state = state =
ISTATE_SEND_STATUS;
sent_status = 0;
eodr = use_misc = 0;
goto check_rsp_state;
}
break;
case ISTATE_SEND_STATUS:
use_misc = 0;
sent_status = 1;
break;
case ISTATE_SEND_ASYNCMSG:
case ISTATE_SEND_NOPIN:
case ISTATE_SEND_STATUS_RECOVERY:
case ISTATE_SEND_TEXTRSP:
use_misc = 0;
sent_status = 1;
break;
case ISTATE_SEND_REJECT:
use_misc = 0;
if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
spin_unlock_bh(&cmd->istate_lock);
complete(&cmd->reject_comp);
goto transport_err;
}
complete(&cmd->reject_comp);
break;
case ISTATE_SEND_TASKMGTRSP:
use_misc = 0;
sent_status = 1;
break;
case ISTATE_SEND_LOGOUTRSP:
spin_unlock_bh(&cmd->istate_lock);
if (!iscsit_logout_post_handler(cmd, conn))
goto restart;
spin_lock_bh(&cmd->istate_lock);
use_misc = 0;
sent_status = 1;
break;
default:
pr_err("Unknown Opcode: 0x%02x ITT:"
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag,
cmd->i_state, conn->cid);
spin_unlock_bh(&cmd->istate_lock);
goto transport_err;
}
if (sent_status) {
cmd->i_state = ISTATE_SENT_STATUS;
sent_status = 0;
}
spin_unlock_bh(&cmd->istate_lock);
if (atomic_read(&conn->check_immediate_queue))
goto get_immediate;
goto get_response;
} else
conn->tx_response_queue = 0;
}
transport_err:
iscsit_take_action_for_connection_exit(conn);
goto restart;
out:
return 0;
}
int iscsi_target_rx_thread(void *arg)
{
int ret;
u8 buffer[ISCSI_HDR_LEN], opcode;
u32 checksum = 0, digest = 0;
struct iscsi_conn *conn = NULL;
struct iscsi_thread_set *ts = arg;
struct kvec iov;
/*
* Allow ourselves to be interrupted by SIGINT so that a
* connection recovery / failure event can be triggered externally.
*/
allow_signal(SIGINT);
restart:
conn = iscsi_rx_thread_pre_handler(ts);
if (!conn)
goto out;
while (!kthread_should_stop()) {
/*
* Ensure that both TX and RX per connection kthreads
* are scheduled to run on the same CPU.
*/
iscsit_thread_check_cpumask(conn, current, 0);
memset(buffer, 0, ISCSI_HDR_LEN);
memset(&iov, 0, sizeof(struct kvec));
iov.iov_base = buffer;
iov.iov_len = ISCSI_HDR_LEN;
ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
if (ret != ISCSI_HDR_LEN) {
iscsit_rx_thread_wait_for_tcp(conn);
goto transport_err;
}
/*
* Set conn->bad_hdr for use with REJECT PDUs.
*/
memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
if (conn->conn_ops->HeaderDigest) {
iov.iov_base = &digest;
iov.iov_len = ISCSI_CRC_LEN;
ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
if (ret != ISCSI_CRC_LEN) {
iscsit_rx_thread_wait_for_tcp(conn);
goto transport_err;
}
iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
buffer, ISCSI_HDR_LEN,
0, NULL, (u8 *)&checksum);
if (digest != checksum) {
pr_err("HeaderDigest CRC32C failed,"
" received 0x%08x, computed 0x%08x\n",
digest, checksum);
/*
* Set the PDU to 0xff so it will intentionally
* hit default in the switch below.
*/
memset(buffer, 0xff, ISCSI_HDR_LEN);
spin_lock_bh(&conn->sess->session_stats_lock);
conn->sess->conn_digest_errors++;
spin_unlock_bh(&conn->sess->session_stats_lock);
} else {
pr_debug("Got HeaderDigest CRC32C"
" 0x%08x\n", checksum);
}
}
if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
goto transport_err;
opcode = buffer[0] & ISCSI_OPCODE_MASK;
if (conn->sess->sess_ops->SessionType &&
((!(opcode & ISCSI_OP_TEXT)) ||
(!(opcode & ISCSI_OP_LOGOUT)))) {
pr_err("Received illegal iSCSI Opcode: 0x%02x"
" while in Discovery Session, rejecting.\n", opcode);
iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
buffer, conn);
goto transport_err;
}
switch (opcode) {
case ISCSI_OP_SCSI_CMD:
if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
goto transport_err;
break;
case ISCSI_OP_SCSI_DATA_OUT:
if (iscsit_handle_data_out(conn, buffer) < 0)
goto transport_err;
break;
case ISCSI_OP_NOOP_OUT:
if (iscsit_handle_nop_out(conn, buffer) < 0)
goto transport_err;
break;
case ISCSI_OP_SCSI_TMFUNC:
if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
goto transport_err;
break;
case ISCSI_OP_TEXT:
if (iscsit_handle_text_cmd(conn, buffer) < 0)
goto transport_err;
break;
case ISCSI_OP_LOGOUT:
ret = iscsit_handle_logout_cmd(conn, buffer);
if (ret > 0) {
wait_for_completion_timeout(&conn->conn_logout_comp,
SECONDS_FOR_LOGOUT_COMP * HZ);
goto transport_err;
} else if (ret < 0)
goto transport_err;
break;
case ISCSI_OP_SNACK:
if (iscsit_handle_snack(conn, buffer) < 0)
goto transport_err;
break;
default:
pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
opcode);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Cannot recover from unknown"
" opcode while ERL=0, closing iSCSI connection"
".\n");
goto transport_err;
}
if (!conn->conn_ops->OFMarker) {
pr_err("Unable to recover from unknown"
" opcode while OFMarker=No, closing iSCSI"
" connection.\n");
goto transport_err;
}
if (iscsit_recover_from_unknown_opcode(conn) < 0) {
pr_err("Unable to recover from unknown"
" opcode, closing iSCSI connection.\n");
goto transport_err;
}
break;
}
}
transport_err:
if (!signal_pending(current))
atomic_set(&conn->transport_failed, 1);
iscsit_take_action_for_connection_exit(conn);
goto restart;
out:
return 0;
}
static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
{
struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
struct iscsi_session *sess = conn->sess;
/*
* We expect this function to only ever be called from either RX or TX
* thread context via iscsit_close_connection() once the other context
* has been reset -> returned sleeping pre-handler state.
*/
spin_lock_bh(&conn->cmd_lock);
list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
list_del(&cmd->i_list);
spin_unlock_bh(&conn->cmd_lock);
iscsit_increment_maxcmdsn(cmd, sess);
iscsit_free_cmd(cmd);
spin_lock_bh(&conn->cmd_lock);
}
spin_unlock_bh(&conn->cmd_lock);
}
static void iscsit_stop_timers_for_cmds(
struct iscsi_conn *conn)
{
struct iscsi_cmd *cmd;
spin_lock_bh(&conn->cmd_lock);
list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
if (cmd->data_direction == DMA_TO_DEVICE)
iscsit_stop_dataout_timer(cmd);
}
spin_unlock_bh(&conn->cmd_lock);
}
int iscsit_close_connection(
struct iscsi_conn *conn)
{
int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
struct iscsi_session *sess = conn->sess;
pr_debug("Closing iSCSI connection CID %hu on SID:"
" %u\n", conn->cid, sess->sid);
/*
* Always up conn_logout_comp just in case the RX Thread is sleeping
* and the logout response never got sent because the connection
* failed.
*/
complete(&conn->conn_logout_comp);
iscsi_release_thread_set(conn);
iscsit_stop_timers_for_cmds(conn);
iscsit_stop_nopin_response_timer(conn);
iscsit_stop_nopin_timer(conn);
iscsit_free_queue_reqs_for_conn(conn);
/*
* During Connection recovery drop unacknowledged out of order
* commands for this connection, and prepare the other commands
* for realligence.
*
* During normal operation clear the out of order commands (but
* do not free the struct iscsi_ooo_cmdsn's) and release all
* struct iscsi_cmds.
*/
if (atomic_read(&conn->connection_recovery)) {
iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
iscsit_prepare_cmds_for_realligance(conn);
} else {
iscsit_clear_ooo_cmdsns_for_conn(conn);
iscsit_release_commands_from_conn(conn);
}
/*
* Handle decrementing session or connection usage count if
* a logout response was not able to be sent because the
* connection failed. Fall back to Session Recovery here.
*/
if (atomic_read(&conn->conn_logout_remove)) {
if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
iscsit_dec_conn_usage_count(conn);
iscsit_dec_session_usage_count(sess);
}
if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
iscsit_dec_conn_usage_count(conn);
atomic_set(&conn->conn_logout_remove, 0);
atomic_set(&sess->session_reinstatement, 0);
atomic_set(&sess->session_fall_back_to_erl0, 1);
}
spin_lock_bh(&sess->conn_lock);
list_del(&conn->conn_list);
/*
* Attempt to let the Initiator know this connection failed by
* sending an Connection Dropped Async Message on another
* active connection.
*/
if (atomic_read(&conn->connection_recovery))
iscsit_build_conn_drop_async_message(conn);
spin_unlock_bh(&sess->conn_lock);
/*
* If connection reinstatement is being performed on this connection,
* up the connection reinstatement semaphore that is being blocked on
* in iscsit_cause_connection_reinstatement().
*/
spin_lock_bh(&conn->state_lock);
if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
spin_unlock_bh(&conn->state_lock);
complete(&conn->conn_wait_comp);
wait_for_completion(&conn->conn_post_wait_comp);
spin_lock_bh(&conn->state_lock);
}
/*
* If connection reinstatement is being performed on this connection
* by receiving a REMOVECONNFORRECOVERY logout request, up the
* connection wait rcfr semaphore that is being blocked on
* an iscsit_connection_reinstatement_rcfr().
*/
if (atomic_read(&conn->connection_wait_rcfr)) {
spin_unlock_bh(&conn->state_lock);
complete(&conn->conn_wait_rcfr_comp);
wait_for_completion(&conn->conn_post_wait_comp);
spin_lock_bh(&conn->state_lock);
}
atomic_set(&conn->connection_reinstatement, 1);
spin_unlock_bh(&conn->state_lock);
/*
* If any other processes are accessing this connection pointer we
* must wait until they have completed.
*/
iscsit_check_conn_usage_count(conn);
if (conn->conn_rx_hash.tfm)
crypto_free_hash(conn->conn_rx_hash.tfm);
if (conn->conn_tx_hash.tfm)
crypto_free_hash(conn->conn_tx_hash.tfm);
if (conn->conn_cpumask)
free_cpumask_var(conn->conn_cpumask);
kfree(conn->conn_ops);
conn->conn_ops = NULL;
if (conn->sock) {
if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
kfree(conn->sock->file);
conn->sock->file = NULL;
}
sock_release(conn->sock);
}
conn->thread_set = NULL;
pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
conn->conn_state = TARG_CONN_STATE_FREE;
kfree(conn);
spin_lock_bh(&sess->conn_lock);
atomic_dec(&sess->nconn);
pr_debug("Decremented iSCSI connection count to %hu from node:"
" %s\n", atomic_read(&sess->nconn),
sess->sess_ops->InitiatorName);
/*
* Make sure that if one connection fails in an non ERL=2 iSCSI
* Session that they all fail.
*/
if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
!atomic_read(&sess->session_logout))
atomic_set(&sess->session_fall_back_to_erl0, 1);
/*
* If this was not the last connection in the session, and we are
* performing session reinstatement or falling back to ERL=0, call
* iscsit_stop_session() without sleeping to shutdown the other
* active connections.
*/
if (atomic_read(&sess->nconn)) {
if (!atomic_read(&sess->session_reinstatement) &&
!atomic_read(&sess->session_fall_back_to_erl0)) {
spin_unlock_bh(&sess->conn_lock);
return 0;
}
if (!atomic_read(&sess->session_stop_active)) {
atomic_set(&sess->session_stop_active, 1);
spin_unlock_bh(&sess->conn_lock);
iscsit_stop_session(sess, 0, 0);
return 0;
}
spin_unlock_bh(&sess->conn_lock);
return 0;
}
/*
* If this was the last connection in the session and one of the
* following is occurring:
*
* Session Reinstatement is not being performed, and are falling back
* to ERL=0 call iscsit_close_session().
*
* Session Logout was requested. iscsit_close_session() will be called
* elsewhere.
*
* Session Continuation is not being performed, start the Time2Retain
* handler and check if sleep_on_sess_wait_sem is active.
*/
if (!atomic_read(&sess->session_reinstatement) &&
atomic_read(&sess->session_fall_back_to_erl0)) {
spin_unlock_bh(&sess->conn_lock);
iscsit_close_session(sess);
return 0;
} else if (atomic_read(&sess->session_logout)) {
pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
sess->session_state = TARG_SESS_STATE_FREE;
spin_unlock_bh(&sess->conn_lock);
if (atomic_read(&sess->sleep_on_sess_wait_comp))
complete(&sess->session_wait_comp);
return 0;
} else {
pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
sess->session_state = TARG_SESS_STATE_FAILED;
if (!atomic_read(&sess->session_continuation)) {
spin_unlock_bh(&sess->conn_lock);
iscsit_start_time2retain_handler(sess);
} else
spin_unlock_bh(&sess->conn_lock);
if (atomic_read(&sess->sleep_on_sess_wait_comp))
complete(&sess->session_wait_comp);
return 0;
}
spin_unlock_bh(&sess->conn_lock);
return 0;
}
int iscsit_close_session(struct iscsi_session *sess)
{
struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
if (atomic_read(&sess->nconn)) {
pr_err("%d connection(s) still exist for iSCSI session"
" to %s\n", atomic_read(&sess->nconn),
sess->sess_ops->InitiatorName);
BUG();
}
spin_lock_bh(&se_tpg->session_lock);
atomic_set(&sess->session_logout, 1);
atomic_set(&sess->session_reinstatement, 1);
iscsit_stop_time2retain_timer(sess);
spin_unlock_bh(&se_tpg->session_lock);
/*
* transport_deregister_session_configfs() will clear the
* struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
* can be setting it again with __transport_register_session() in
* iscsi_post_login_handler() again after the iscsit_stop_session()
* completes in iscsi_np context.
*/
transport_deregister_session_configfs(sess->se_sess);
/*
* If any other processes are accessing this session pointer we must
* wait until they have completed. If we are in an interrupt (the
* time2retain handler) and contain and active session usage count we
* restart the timer and exit.
*/
if (!in_interrupt()) {
if (iscsit_check_session_usage_count(sess) == 1)
iscsit_stop_session(sess, 1, 1);
} else {
if (iscsit_check_session_usage_count(sess) == 2) {
atomic_set(&sess->session_logout, 0);
iscsit_start_time2retain_handler(sess);
return 0;
}
}
transport_deregister_session(sess->se_sess);
if (sess->sess_ops->ErrorRecoveryLevel == 2)
iscsit_free_connection_recovery_entires(sess);
iscsit_free_all_ooo_cmdsns(sess);
spin_lock_bh(&se_tpg->session_lock);
pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
sess->session_state = TARG_SESS_STATE_FREE;
pr_debug("Released iSCSI session from node: %s\n",
sess->sess_ops->InitiatorName);
tpg->nsessions--;
if (tpg->tpg_tiqn)
tpg->tpg_tiqn->tiqn_nsessions--;
pr_debug("Decremented number of active iSCSI Sessions on"
" iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
spin_lock(&sess_idr_lock);
idr_remove(&sess_idr, sess->session_index);
spin_unlock(&sess_idr_lock);
kfree(sess->sess_ops);
sess->sess_ops = NULL;
spin_unlock_bh(&se_tpg->session_lock);
kfree(sess);
return 0;
}
static void iscsit_logout_post_handler_closesession(
struct iscsi_conn *conn)
{
struct iscsi_session *sess = conn->sess;
iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
atomic_set(&conn->conn_logout_remove, 0);
complete(&conn->conn_logout_comp);
iscsit_dec_conn_usage_count(conn);
iscsit_stop_session(sess, 1, 1);
iscsit_dec_session_usage_count(sess);
iscsit_close_session(sess);
}
static void iscsit_logout_post_handler_samecid(
struct iscsi_conn *conn)
{
iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
atomic_set(&conn->conn_logout_remove, 0);
complete(&conn->conn_logout_comp);
iscsit_cause_connection_reinstatement(conn, 1);
iscsit_dec_conn_usage_count(conn);
}
static void iscsit_logout_post_handler_diffcid(
struct iscsi_conn *conn,
u16 cid)
{
struct iscsi_conn *l_conn;
struct iscsi_session *sess = conn->sess;
if (!sess)
return;
spin_lock_bh(&sess->conn_lock);
list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
if (l_conn->cid == cid) {
iscsit_inc_conn_usage_count(l_conn);
break;
}
}
spin_unlock_bh(&sess->conn_lock);
if (!l_conn)
return;
if (l_conn->sock)
l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
spin_lock_bh(&l_conn->state_lock);
pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
spin_unlock_bh(&l_conn->state_lock);
iscsit_cause_connection_reinstatement(l_conn, 1);
iscsit_dec_conn_usage_count(l_conn);
}
/*
* Return of 0 causes the TX thread to restart.
*/
static int iscsit_logout_post_handler(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
int ret = 0;
switch (cmd->logout_reason) {
case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
iscsit_logout_post_handler_closesession(conn);
break;
}
ret = 0;
break;
case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
if (conn->cid == cmd->logout_cid) {
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
iscsit_logout_post_handler_samecid(conn);
break;
}
ret = 0;
} else {
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
iscsit_logout_post_handler_diffcid(conn,
cmd->logout_cid);
break;
case ISCSI_LOGOUT_CID_NOT_FOUND:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
break;
}
ret = 1;
}
break;
case ISCSI_LOGOUT_REASON_RECOVERY:
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
case ISCSI_LOGOUT_CID_NOT_FOUND:
case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
break;
}
ret = 1;
break;
default:
break;
}
return ret;
}
void iscsit_fail_session(struct iscsi_session *sess)
{
struct iscsi_conn *conn;
spin_lock_bh(&sess->conn_lock);
list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
}
spin_unlock_bh(&sess->conn_lock);
pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
sess->session_state = TARG_SESS_STATE_FAILED;
}
int iscsit_free_session(struct iscsi_session *sess)
{
u16 conn_count = atomic_read(&sess->nconn);
struct iscsi_conn *conn, *conn_tmp = NULL;
int is_last;
spin_lock_bh(&sess->conn_lock);
atomic_set(&sess->sleep_on_sess_wait_comp, 1);
list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
conn_list) {
if (conn_count == 0)
break;
if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
is_last = 1;
} else {
iscsit_inc_conn_usage_count(conn_tmp);
is_last = 0;
}
iscsit_inc_conn_usage_count(conn);
spin_unlock_bh(&sess->conn_lock);
iscsit_cause_connection_reinstatement(conn, 1);
spin_lock_bh(&sess->conn_lock);
iscsit_dec_conn_usage_count(conn);
if (is_last == 0)
iscsit_dec_conn_usage_count(conn_tmp);
conn_count--;
}
if (atomic_read(&sess->nconn)) {
spin_unlock_bh(&sess->conn_lock);
wait_for_completion(&sess->session_wait_comp);
} else
spin_unlock_bh(&sess->conn_lock);
iscsit_close_session(sess);
return 0;
}
void iscsit_stop_session(
struct iscsi_session *sess,
int session_sleep,
int connection_sleep)
{
u16 conn_count = atomic_read(&sess->nconn);
struct iscsi_conn *conn, *conn_tmp = NULL;
int is_last;
spin_lock_bh(&sess->conn_lock);
if (session_sleep)
atomic_set(&sess->sleep_on_sess_wait_comp, 1);
if (connection_sleep) {
list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
conn_list) {
if (conn_count == 0)
break;
if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
is_last = 1;
} else {
iscsit_inc_conn_usage_count(conn_tmp);
is_last = 0;
}
iscsit_inc_conn_usage_count(conn);
spin_unlock_bh(&sess->conn_lock);
iscsit_cause_connection_reinstatement(conn, 1);
spin_lock_bh(&sess->conn_lock);
iscsit_dec_conn_usage_count(conn);
if (is_last == 0)
iscsit_dec_conn_usage_count(conn_tmp);
conn_count--;
}
} else {
list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
iscsit_cause_connection_reinstatement(conn, 0);
}
if (session_sleep && atomic_read(&sess->nconn)) {
spin_unlock_bh(&sess->conn_lock);
wait_for_completion(&sess->session_wait_comp);
} else
spin_unlock_bh(&sess->conn_lock);
}
int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
{
struct iscsi_session *sess;
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
struct se_session *se_sess, *se_sess_tmp;
int session_count = 0;
spin_lock_bh(&se_tpg->session_lock);
if (tpg->nsessions && !force) {
spin_unlock_bh(&se_tpg->session_lock);
return -1;
}
list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
sess_list) {
sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
spin_lock(&sess->conn_lock);
if (atomic_read(&sess->session_fall_back_to_erl0) ||
atomic_read(&sess->session_logout) ||
(sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
spin_unlock(&sess->conn_lock);
continue;
}
atomic_set(&sess->session_reinstatement, 1);
spin_unlock(&sess->conn_lock);
spin_unlock_bh(&se_tpg->session_lock);
iscsit_free_session(sess);
spin_lock_bh(&se_tpg->session_lock);
session_count++;
}
spin_unlock_bh(&se_tpg->session_lock);
pr_debug("Released %d iSCSI Session(s) from Target Portal"
" Group: %hu\n", session_count, tpg->tpgt);
return 0;
}
MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
MODULE_VERSION("4.1.x");
MODULE_AUTHOR("nab@Linux-iSCSI.org");
MODULE_LICENSE("GPL");
module_init(iscsi_target_init_module);
module_exit(iscsi_target_cleanup_module);
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