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kernel-fxtec-pro1x/drivers/target/iscsi/iscsi_target.c
Linus Torvalds 48efe453e6 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 
Pull SCSI target updates from Nicholas Bellinger:
 "Lots of activity again this round for I/O performance optimizations
  (per-cpu IDA pre-allocation for vhost + iscsi/target), and the
  addition of new fabric independent features to target-core
  (COMPARE_AND_WRITE + EXTENDED_COPY).

  The main highlights include:

   - Support for iscsi-target login multiplexing across individual
     network portals
   - Generic Per-cpu IDA logic (kent + akpm + clameter)
   - Conversion of vhost to use per-cpu IDA pre-allocation for
     descriptors, SGLs and userspace page pointer list
   - Conversion of iscsi-target + iser-target to use per-cpu IDA
     pre-allocation for descriptors
   - Add support for generic COMPARE_AND_WRITE (AtomicTestandSet)
     emulation for virtual backend drivers
   - Add support for generic EXTENDED_COPY (CopyOffload) emulation for
     virtual backend drivers.
   - Add support for fast memory registration mode to iser-target (Vu)

  The patches to add COMPARE_AND_WRITE and EXTENDED_COPY support are of
  particular significance, which make us the first and only open source
  target to support the full set of VAAI primitives.

  Currently Linux clients are lacking upstream support to actually
  utilize these primitives.  However, with server side support now in
  place for folks like MKP + ZAB working on the client, this logic once
  reserved for the highest end of storage arrays, can now be run in VMs
  on their laptops"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (50 commits)
  target/iscsi: Bump versions to v4.1.0
  target: Update copyright ownership/year information to 2013
  iscsi-target: Bump default TCP listen backlog to 256
  target: Fix >= v3.9+ regression in PR APTPL + ALUA metadata write-out
  iscsi-target; Bump default CmdSN Depth to 64
  iscsi-target: Remove unnecessary wait_for_completion in iscsi_get_thread_set
  iscsi-target: Add thread_set->ts_activate_sem + use common deallocate
  iscsi-target: Fix race with thread_pre_handler flush_signals + ISCSI_THREAD_SET_DIE
  target: remove unused including <linux/version.h>
  iser-target: introduce fast memory registration mode (FRWR)
  iser-target: generalize rdma memory registration and cleanup
  iser-target: move rdma wr processing to a shared function
  target: Enable global EXTENDED_COPY setup/release
  target: Add Third Party Copy (3PC) bit in INQUIRY response
  target: Enable EXTENDED_COPY setup in spc_parse_cdb
  target: Add support for EXTENDED_COPY copy offload emulation
  target: Avoid non-existent tg_pt_gp_mem in target_alua_state_check
  target: Add global device list for EXTENDED_COPY
  target: Make helpers non static for EXTENDED_COPY command setup
  target: Make spc_parse_naa_6h_vendor_specific non static
  ...
2013-09-12 16:11:45 -07:00

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/*******************************************************************************
* This file contains main functions related to the iSCSI Target Core Driver.
*
* (c) Copyright 2007-2013 Datera, Inc.
*
* 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 <linux/idr.h>
#include <asm/unaligned.h>
#include <scsi/scsi_device.h>
#include <scsi/iscsi_proto.h>
#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.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"
#include <target/iscsi/iscsi_transport.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_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 *,
struct iscsi_scsi_req *, u32);
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);
tiqn->tiqn_state = TIQN_STATE_ACTIVE;
idr_preload(GFP_KERNEL);
spin_lock(&tiqn_lock);
ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
if (ret < 0) {
pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
spin_unlock(&tiqn_lock);
idr_preload_end();
kfree(tiqn);
return ERR_PTR(ret);
}
tiqn->tiqn_index = ret;
list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
spin_unlock(&tiqn_lock);
idr_preload_end();
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;
}
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 = down_interruptible(&tpg->np_login_sem);
if ((ret != 0) || signal_pending(current))
return -1;
spin_lock_bh(&tpg->tpg_state_lock);
if (tpg->tpg_state != TPG_STATE_ACTIVE) {
spin_unlock_bh(&tpg->tpg_state_lock);
up(&tpg->np_login_sem);
return -1;
}
spin_unlock_bh(&tpg->tpg_state_lock);
return 0;
}
void iscsit_login_kref_put(struct kref *kref)
{
struct iscsi_tpg_np *tpg_np = container_of(kref,
struct iscsi_tpg_np, tpg_np_kref);
complete(&tpg_np->tpg_np_comp);
}
int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
struct iscsi_tpg_np *tpg_np)
{
struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
up(&tpg->np_login_sem);
if (tpg_np)
kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
if (tiqn)
iscsit_put_tiqn_for_login(tiqn);
return 0;
}
bool iscsit_check_np_match(
struct __kernel_sockaddr_storage *sockaddr,
struct iscsi_np *np,
int network_transport)
{
struct sockaddr_in *sock_in, *sock_in_e;
struct sockaddr_in6 *sock_in6, *sock_in6_e;
bool ip_match = false;
u16 port;
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 = true;
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 = true;
port = ntohs(sock_in->sin_port);
}
if ((ip_match == true) && (np->np_port == port) &&
(np->np_network_transport == network_transport))
return true;
return false;
}
static struct iscsi_np *iscsit_get_np(
struct __kernel_sockaddr_storage *sockaddr,
int network_transport)
{
struct iscsi_np *np;
bool match;
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;
}
match = iscsit_check_np_match(sockaddr, np, network_transport);
if (match == true) {
/*
* 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_transport->name);
return np;
}
int iscsit_reset_np_thread(
struct iscsi_np *np,
struct iscsi_tpg_np *tpg_np,
struct iscsi_portal_group *tpg,
bool shutdown)
{
spin_lock_bh(&np->np_thread_lock);
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);
if (tpg_np && shutdown) {
kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
wait_for_completion(&tpg_np->tpg_np_comp);
}
return 0;
}
static void iscsit_free_np(struct iscsi_np *np)
{
if (np->np_socket)
sock_release(np->np_socket);
}
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);
}
np->np_transport->iscsit_free_np(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_transport->name);
iscsit_put_transport(np->np_transport);
kfree(np);
return 0;
}
static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
{
iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
return 0;
}
static struct iscsit_transport iscsi_target_transport = {
.name = "iSCSI/TCP",
.transport_type = ISCSI_TCP,
.owner = NULL,
.iscsit_setup_np = iscsit_setup_np,
.iscsit_accept_np = iscsit_accept_np,
.iscsit_free_np = iscsit_free_np,
.iscsit_get_login_rx = iscsit_get_login_rx,
.iscsit_put_login_tx = iscsit_put_login_tx,
.iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
.iscsit_immediate_queue = iscsit_immediate_queue,
.iscsit_response_queue = iscsit_response_queue,
.iscsit_queue_data_in = iscsit_queue_rsp,
.iscsit_queue_status = iscsit_queue_rsp,
};
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_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 ts_out2;
}
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;
}
iscsit_register_transport(&iscsi_target_transport);
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);
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();
iscsit_unregister_transport(&iscsi_target_transport);
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);
}
static int iscsit_add_reject(
struct iscsi_conn *conn,
u8 reason,
unsigned char *buf)
{
struct iscsi_cmd *cmd;
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
return -1;
cmd->iscsi_opcode = ISCSI_OP_REJECT;
cmd->reject_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_free_cmd(cmd, false);
return -1;
}
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &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);
return -1;
}
static int iscsit_add_reject_from_cmd(
struct iscsi_cmd *cmd,
u8 reason,
bool add_to_conn,
unsigned char *buf)
{
struct iscsi_conn *conn;
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;
cmd->reject_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_free_cmd(cmd, false);
return -1;
}
if (add_to_conn) {
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &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);
/*
* Perform the kref_put now if se_cmd has already been setup by
* scsit_setup_scsi_cmd()
*/
if (cmd->se_cmd.se_tfo != NULL) {
pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
}
return -1;
}
static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
unsigned char *buf)
{
return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
}
int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
{
return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
}
/*
* Map some portion of the allocated scatterlist to an iovec, suitable for
* kernel sockets to copy data in/out.
*/
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 know each entry in t_data_sg contains a page.
*/
sg = &cmd->se_cmd.t_data_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;
if (conn->sess->sess_ops->RDMAExtensions)
return;
spin_lock_bh(&conn->cmd_lock);
list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
spin_lock(&cmd->istate_lock);
if ((cmd->i_state == ISTATE_SENT_STATUS) &&
iscsi_sna_lt(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 = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
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;
}
int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
int data_direction, payload_length;
struct iscsi_scsi_req *hdr;
int iscsi_task_attr;
int sam_task_attr;
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);
/* 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_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
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_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
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_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
(hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
pr_err("Bidirectional operations not supported!\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
pr_err("Illegally set Immediate Bit in iSCSI Initiator"
" Scsi Command PDU.\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if (payload_length && !conn->sess->sess_ops->ImmediateData) {
pr_err("ImmediateData=No but DataSegmentLength=%u,"
" protocol error.\n", payload_length);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if ((be32_to_cpu(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_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if (payload_length > be32_to_cpu(hdr->data_length)) {
pr_err("DataSegmentLength: %u is greater than"
" EDTL: %u, protocol error.\n", payload_length,
hdr->data_length);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err("DataSegmentLength: %u is greater than"
" MaxXmitDataSegmentLength: %u, protocol error.\n",
payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
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_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
(hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
DMA_NONE;
cmd->data_direction = data_direction;
iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
/*
* Figure out the SAM Task Attribute for the incoming SCSI CDB
*/
if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
(iscsi_task_attr == ISCSI_ATTR_SIMPLE))
sam_task_attr = MSG_SIMPLE_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
sam_task_attr = MSG_ORDERED_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
sam_task_attr = MSG_HEAD_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_ACA)
sam_task_attr = MSG_ACA_TAG;
else {
pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
" MSG_SIMPLE_TAG\n", iscsi_task_attr);
sam_task_attr = MSG_SIMPLE_TAG;
}
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 = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->first_burst_len = payload_length;
if (!conn->sess->sess_ops->RDMAExtensions &&
cmd->data_direction == DMA_FROM_DEVICE) {
struct iscsi_datain_req *dr;
dr = iscsit_allocate_datain_req();
if (!dr)
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
iscsit_attach_datain_req(cmd, dr);
}
/*
* Initialize struct se_cmd descriptor from target_core_mod infrastructure
*/
transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
conn->sess->se_sess, be32_to_cpu(hdr->data_length),
cmd->data_direction, sam_task_attr,
cmd->sense_buffer + 2);
pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
" ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
conn->cid);
target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
scsilun_to_int(&hdr->lun));
if (cmd->sense_reason)
goto attach_cmd;
cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
if (cmd->sense_reason) {
if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
goto attach_cmd;
}
if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
attach_cmd:
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &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);
return 0;
}
EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
{
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);
}
EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_scsi_req *hdr)
{
int cmdsn_ret = 0;
/*
* 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,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
return 0;
}
}
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
/*
* If no Immediate Data is attached, it's OK to return now.
*/
if (!cmd->immediate_data) {
if (!cmd->sense_reason && cmd->unsolicited_data)
iscsit_set_unsoliticed_dataout(cmd);
if (!cmd->sense_reason)
return 0;
target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
return 0;
}
/*
* Early CHECK_CONDITIONs with ImmediateData never make it to command
* execution. These exceptions are processed in CmdSN order using
* iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
*/
if (cmd->sense_reason) {
if (cmd->reject_reason)
return 0;
return 1;
}
/*
* Call directly into transport_generic_new_cmd() to perform
* the backend memory allocation.
*/
cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
if (cmd->sense_reason)
return 1;
return 0;
}
EXPORT_SYMBOL(iscsit_process_scsi_cmd);
static int
iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
bool dump_payload)
{
struct iscsi_conn *conn = cmd->conn;
int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
/*
* Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
*/
if (dump_payload == true)
goto after_immediate_data;
immed_ret = iscsit_handle_immediate_data(cmd, hdr,
cmd->first_burst_len);
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(cmd->conn, cmd,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
int rc;
rc = iscsit_dump_data_payload(cmd->conn,
cmd->first_burst_len, 1);
target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
return rc;
} else if (cmd->unsolicited_data)
iscsit_set_unsoliticed_dataout(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, cmd->conn, cmd->i_state);
} else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
return -1;
return 0;
}
static int
iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
int rc, immed_data;
bool dump_payload = false;
rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
if (rc < 0)
return 0;
/*
* Allocation iovecs needed for struct socket operations for
* traditional iSCSI block I/O.
*/
if (iscsit_allocate_iovecs(cmd) < 0) {
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
immed_data = cmd->immediate_data;
rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
if (rc < 0)
return rc;
else if (rc > 0)
dump_payload = true;
if (!immed_data)
return 0;
return iscsit_get_immediate_data(cmd, hdr, dump_payload);
}
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,
const void *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);
}
int
iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
struct iscsi_cmd **out_cmd)
{
struct iscsi_data *hdr = (struct iscsi_data *)buf;
struct iscsi_cmd *cmd = NULL;
struct se_cmd *se_cmd;
u32 payload_length = ntoh24(hdr->dlength);
int rc;
if (!payload_length) {
pr_err("DataOUT payload is ZERO, protocol error.\n");
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
}
/* 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->MaxXmitDataSegmentLength) {
pr_err("DataSegmentLength: %u is greater than"
" MaxXmitDataSegmentLength: %u\n", payload_length,
conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
}
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, ntohl(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_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
}
se_cmd = &cmd->se_cmd;
iscsit_mod_dataout_timer(cmd);
if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
pr_err("DataOut Offset: %u, Length %u greater than"
" iSCSI Command EDTL %u, protocol error.\n",
hdr->offset, payload_length, cmd->se_cmd.data_length);
return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
}
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... */
WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
dump_unsolicited_data = 1;
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 (se_cmd->transport_state & CMD_T_ABORTED) {
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.
*/
rc = iscsit_check_pre_dataout(cmd, buf);
if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
return 0;
else if (rc == DATAOUT_CANNOT_RECOVER)
return -1;
*out_cmd = cmd;
return 0;
}
EXPORT_SYMBOL(iscsit_check_dataout_hdr);
static int
iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_data *hdr)
{
struct kvec *iov;
u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
u32 payload_length = ntoh24(hdr->dlength);
int iov_ret, data_crc_failed = 0;
rx_size += payload_length;
iov = &cmd->iov_data[0];
iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(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,
be32_to_cpu(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);
}
}
return data_crc_failed;
}
int
iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
bool data_crc_failed)
{
struct iscsi_conn *conn = cmd->conn;
int rc, ooo_cmdsn;
/*
* Increment post receive data and CRC values or perform
* within-command recovery.
*/
rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
return 0;
else if (rc == DATAOUT_SEND_R2T) {
iscsit_set_dataout_sequence_values(cmd);
conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
} else if (rc == 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);
if (ooo_cmdsn)
return 0;
target_execute_cmd(&cmd->se_cmd);
return 0;
} else /* DATAOUT_CANNOT_RECOVER */
return -1;
return 0;
}
EXPORT_SYMBOL(iscsit_check_dataout_payload);
static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
{
struct iscsi_cmd *cmd;
struct iscsi_data *hdr = (struct iscsi_data *)buf;
int rc;
bool data_crc_failed = false;
rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
if (rc < 0)
return 0;
else if (!cmd)
return 0;
rc = iscsit_get_dataout(conn, cmd, hdr);
if (rc < 0)
return rc;
else if (rc > 0)
data_crc_failed = true;
return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
}
int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_nopout *hdr)
{
u32 payload_length = ntoh24(hdr->dlength);
if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
" not set, protocol error.\n");
if (!cmd)
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
" greater than MaxXmitDataSegmentLength: %u, protocol"
" error.\n", payload_length,
conn->conn_ops->MaxXmitDataSegmentLength);
if (!cmd)
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
hdr->itt == RESERVED_ITT ? "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 == cpu_to_be32(0xFFFFFFFF)) {
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 = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->data_direction = DMA_NONE;
}
return 0;
}
EXPORT_SYMBOL(iscsit_setup_nop_out);
int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_nopout *hdr)
{
struct iscsi_cmd *cmd_p = NULL;
int cmdsn_ret = 0;
/*
* Initiator is expecting a NopIN ping reply..
*/
if (hdr->itt != RESERVED_ITT) {
BUG_ON(!cmd);
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
iscsit_ack_from_expstatsn(conn, be32_to_cpu(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,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
return 0;
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
return 0;
}
/*
* This was a response to a unsolicited NOPIN ping.
*/
if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
if (!cmd_p)
return -EINVAL;
iscsit_stop_nopin_response_timer(conn);
cmd_p->i_state = ISTATE_REMOVE;
iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
iscsit_start_nopin_timer(conn);
return 0;
}
/*
* Otherwise, initiator is not expecting a NOPIN is response.
* Just ignore for now.
*/
return 0;
}
EXPORT_SYMBOL(iscsit_process_nop_out);
static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
unsigned char *ping_data = NULL;
struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
struct kvec *iov = NULL;
u32 payload_length = ntoh24(hdr->dlength);
int ret;
ret = iscsit_setup_nop_out(conn, cmd, hdr);
if (ret < 0)
return 0;
/*
* Handle NOP-OUT payload for traditional iSCSI sockets
*/
if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
u32 checksum, data_crc, padding = 0;
int niov = 0, rx_got, 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);
}
return iscsit_process_nop_out(conn, cmd, hdr);
out:
if (cmd)
iscsit_free_cmd(cmd, false);
kfree(ping_data);
return ret;
}
int
iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct se_tmr_req *se_tmr;
struct iscsi_tmr_req *tmr_req;
struct iscsi_tm *hdr;
int out_of_order_cmdsn = 0, ret;
bool sess_ref = false;
u8 function;
hdr = (struct iscsi_tm *) buf;
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 != RESERVED_ITT)) {
pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
hdr->rtt = RESERVED_ITT;
}
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_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
cmd->data_direction = DMA_NONE;
cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
if (!cmd->tmr_req) {
pr_err("Unable to allocate memory for"
" Task Management command!\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
buf);
}
/*
* TASK_REASSIGN for ERL=2 / connection stays inside of
* LIO-Target $FABRIC_MOD
*/
if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
u8 tcm_function;
int ret;
transport_init_se_cmd(&cmd->se_cmd,
&lio_target_fabric_configfs->tf_ops,
conn->sess->se_sess, 0, DMA_NONE,
MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
sess_ref = true;
switch (function) {
case ISCSI_TM_FUNC_ABORT_TASK:
tcm_function = TMR_ABORT_TASK;
break;
case ISCSI_TM_FUNC_ABORT_TASK_SET:
tcm_function = TMR_ABORT_TASK_SET;
break;
case ISCSI_TM_FUNC_CLEAR_ACA:
tcm_function = TMR_CLEAR_ACA;
break;
case ISCSI_TM_FUNC_CLEAR_TASK_SET:
tcm_function = TMR_CLEAR_TASK_SET;
break;
case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
tcm_function = TMR_LUN_RESET;
break;
case ISCSI_TM_FUNC_TARGET_WARM_RESET:
tcm_function = TMR_TARGET_WARM_RESET;
break;
case ISCSI_TM_FUNC_TARGET_COLD_RESET:
tcm_function = TMR_TARGET_COLD_RESET;
break;
default:
pr_err("Unknown iSCSI TMR Function:"
" 0x%02x\n", function);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
tcm_function, GFP_KERNEL);
if (ret < 0)
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
}
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 = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(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 = transport_lookup_tmr_lun(&cmd->se_cmd,
scsilun_to_int(&hdr->lun));
if (ret < 0) {
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)
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) {
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) {
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)
break;
if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
break;
default:
pr_err("Unknown TMR function: 0x%02x, protocol"
" error.\n", function);
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_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, 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 -1;
}
iscsit_ack_from_expstatsn(conn, be32_to_cpu(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.
*/
if (sess_ref) {
pr_debug("Handle TMR, using sess_ref=true check\n");
target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
}
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
/* #warning FIXME: Support Text Command parameters besides SendTargets */
int
iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_text *hdr)
{
u32 payload_length = ntoh24(hdr->dlength);
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err("Unable to accept text parameter length: %u"
"greater than MaxXmitDataSegmentLength %u.\n",
payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
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);
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 = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->data_direction = DMA_NONE;
return 0;
}
EXPORT_SYMBOL(iscsit_setup_text_cmd);
int
iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_text *hdr)
{
unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
int cmdsn_ret;
if (!text_in) {
pr_err("Unable to locate text_in buffer for sendtargets"
" discovery\n");
goto reject;
}
if (strncmp("SendTargets", text_in, 11) != 0) {
pr_err("Received Text Data that is not"
" SendTargets, cannot continue.\n");
goto reject;
}
text_ptr = strchr(text_in, '=');
if (!text_ptr) {
pr_err("No \"=\" separator found in Text Data,"
" cannot continue.\n");
goto reject;
}
if (!strncmp("=All", text_ptr, 4)) {
cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
} else if (!strncmp("=iqn.", text_ptr, 5) ||
!strncmp("=eui.", text_ptr, 5)) {
cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
} else {
pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
goto reject;
}
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
return 0;
}
return iscsit_execute_cmd(cmd, 0);
reject:
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
EXPORT_SYMBOL(iscsit_process_text_cmd);
static int
iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_text *hdr = (struct iscsi_text *)buf;
char *text_in = NULL;
u32 payload_length = ntoh24(hdr->dlength);
int rx_size, rc;
rc = iscsit_setup_text_cmd(conn, cmd, hdr);
if (rc < 0)
return 0;
rx_size = payload_length;
if (payload_length) {
u32 checksum = 0, data_crc = 0;
u32 padding = 0, pad_bytes = 0;
int niov = 0, rx_got;
struct kvec iov[3];
text_in = kzalloc(payload_length, GFP_KERNEL);
if (!text_in) {
pr_err("Unable to allocate memory for"
" incoming text parameters\n");
goto reject;
}
cmd->text_in_ptr = text_in;
memset(iov, 0, 3 * sizeof(struct kvec));
iov[niov].iov_base = text_in;
iov[niov++].iov_len = payload_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)
goto reject;
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
text_in, payload_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");
goto reject;
} 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, payload_length);
}
}
text_in[payload_length - 1] = '\0';
pr_debug("Successfully read %d bytes of text"
" data.\n", payload_length);
}
return iscsit_process_text_cmd(conn, cmd, hdr);
reject:
kfree(cmd->text_in_ptr);
cmd->text_in_ptr = NULL;
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
}
EXPORT_SYMBOL(iscsit_handle_text_cmd);
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;
}
int
iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
int cmdsn_ret, logout_remove = 0;
u8 reason_code = 0;
struct iscsi_logout *hdr;
struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
hdr = (struct iscsi_logout *) buf;
reason_code = (hdr->flags & 0x7f);
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");
iscsit_free_cmd(cmd, false);
return 0;
}
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 = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->logout_cid = be16_to_cpu(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) &&
be16_to_cpu(hdr->cid) == conn->cid))
logout_remove = 1;
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
/*
* Immediate commands are executed, well, immediately.
* Non-Immediate Logout Commands are executed in CmdSN order.
*/
if (cmd->immediate_cmd) {
int ret = iscsit_execute_cmd(cmd, 0);
if (ret < 0)
return ret;
} else {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
logout_remove = 0;
else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
}
return logout_remove;
}
EXPORT_SYMBOL(iscsit_handle_logout_cmd);
static int iscsit_handle_snack(
struct iscsi_conn *conn,
unsigned char *buf)
{
struct iscsi_snack *hdr;
hdr = (struct iscsi_snack *) buf;
hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
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(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
}
/*
* 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,
be32_to_cpu(hdr->ttt),
be32_to_cpu(hdr->begrun),
be32_to_cpu(hdr->runlength));
case ISCSI_FLAG_SNACK_TYPE_STATUS:
return iscsit_handle_status_snack(conn, hdr->itt,
be32_to_cpu(hdr->ttt),
be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
be32_to_cpu(hdr->begrun),
be32_to_cpu(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(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
default:
pr_err("Unknown SNACK type 0x%02x, protocol"
" error.\n", hdr->flags & 0x0f);
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
}
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,
struct iscsi_scsi_req *hdr,
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_reject_cmd(cmd,
ISCSI_REASON_DATA_DIGEST_ERROR,
(unsigned char *)hdr);
return IMMEDIATE_DATA_CANNOT_RECOVER;
} else {
iscsit_reject_cmd(cmd,
ISCSI_REASON_DATA_DIGEST_ERROR,
(unsigned char *)hdr);
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->se_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_ATOMIC);
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_conn_node, &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 = RESERVED_ITT;
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, 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 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);
}
}
static void
iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
bool set_statsn)
{
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 = cmd->init_task_tag;
if (hdr->flags & ISCSI_FLAG_DATA_ACK)
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
else
hdr->ttt = cpu_to_be32(0xFFFFFFFF);
if (set_statsn)
hdr->statsn = cpu_to_be32(cmd->stat_sn);
else
hdr->statsn = cpu_to_be32(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);
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);
}
static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
struct iscsi_datain datain;
struct iscsi_datain_req *dr;
struct kvec *iov;
u32 iov_count = 0, tx_size = 0;
int eodr = 0, ret, iov_ret;
bool set_statsn = false;
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->se_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->se_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 = true;
} else if (dr->dr_complete ==
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
set_statsn = true;
}
iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
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, cmd->pdu,
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;
/* sendpage is preferred but can't insert markers */
if (!conn->conn_ops->IFMarker)
ret = iscsit_fe_sendpage_sg(cmd, conn);
else
ret = iscsit_send_tx_data(cmd, conn, 0);
iscsit_unmap_iovec(cmd);
if (ret < 0) {
iscsit_tx_thread_wait_for_tcp(conn);
return ret;
}
if (dr->dr_complete) {
eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2 : 1;
iscsit_free_datain_req(cmd, dr);
}
return eodr;
}
int
iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_logout_rsp *hdr)
{
struct iscsi_conn *logout_conn = NULL;
struct iscsi_conn_recovery *cr = NULL;
struct iscsi_session *sess = conn->sess;
/*
* 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;
}
hdr->opcode = ISCSI_OP_LOGOUT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hdr->response = cmd->logout_response;
hdr->itt = 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);
pr_debug("Built 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;
}
EXPORT_SYMBOL(iscsit_build_logout_rsp);
static int
iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct kvec *iov;
int niov = 0, tx_size, rc;
rc = iscsit_build_logout_rsp(cmd, conn,
(struct iscsi_logout_rsp *)&cmd->pdu[0]);
if (rc < 0)
return rc;
tx_size = ISCSI_HDR_LEN;
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, &cmd->pdu[0],
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;
return 0;
}
void
iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_nopin *hdr, bool nopout_response)
{
hdr->opcode = ISCSI_OP_NOOP_IN;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, cmd->buf_ptr_size);
if (nopout_response)
put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
hdr->itt = cmd->init_task_tag;
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
conn->stat_sn;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
if (nopout_response)
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);
pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
" StatSN: 0x%08x, Length %u\n", (nopout_response) ?
"Solicitied" : "Unsolicitied", cmd->init_task_tag,
cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
}
EXPORT_SYMBOL(iscsit_build_nopin_rsp);
/*
* 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)
{
struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
int tx_size = ISCSI_HDR_LEN, ret;
iscsit_build_nopin_rsp(cmd, conn, hdr, false);
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 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);
ret = iscsit_send_tx_data(cmd, conn, 1);
if (ret < 0) {
iscsit_tx_thread_wait_for_tcp(conn);
return ret;
}
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = want_response ?
ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
return 0;
}
static int
iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
struct kvec *iov;
u32 padding = 0;
int niov = 0, tx_size;
iscsit_build_nopin_rsp(cmd, conn, hdr, true);
tx_size = ISCSI_HDR_LEN;
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, 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;
return 0;
}
static 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;
int ret;
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 = 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, 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);
ret = iscsit_send_tx_data(cmd, conn, 1);
if (ret < 0) {
iscsit_tx_thread_wait_for_tcp(conn);
return ret;
}
spin_lock_bh(&cmd->dataout_timeout_lock);
iscsit_start_dataout_timer(cmd, conn);
spin_unlock_bh(&cmd->dataout_timeout_lock);
return 0;
}
/*
* @recovery: If called from iscsi_task_reassign_complete_write() for
* connection recovery.
*/
int iscsit_build_r2ts_for_cmd(
struct iscsi_conn *conn,
struct iscsi_cmd *cmd,
bool recovery)
{
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 &&
!recovery)
cmd->r2t_offset = max(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 && recovery) {
int new_data_end = offset +
conn->sess->sess_ops->MaxBurstLength -
cmd->next_burst_len;
if (new_data_end > cmd->se_cmd.data_length)
xfer_len = cmd->se_cmd.data_length - offset;
else
xfer_len =
conn->sess->sess_ops->MaxBurstLength -
cmd->next_burst_len;
} else {
int new_data_end = offset +
conn->sess->sess_ops->MaxBurstLength;
if (new_data_end > cmd->se_cmd.data_length)
xfer_len = cmd->se_cmd.data_length - offset;
else
xfer_len = conn->sess->sess_ops->MaxBurstLength;
}
cmd->r2t_offset += xfer_len;
if (cmd->r2t_offset == cmd->se_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;
}
void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
{
if (inc_stat_sn)
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);
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 = 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);
pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
" Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
cmd->se_cmd.scsi_status, conn->cid);
}
EXPORT_SYMBOL(iscsit_build_rsp_pdu);
static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
struct kvec *iov;
u32 padding = 0, tx_size = 0;
int iov_count = 0;
bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
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))) {
put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
cmd->se_cmd.scsi_sense_length += sizeof (__be16);
padding = -(cmd->se_cmd.scsi_sense_length) & 3;
hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
iov[iov_count].iov_base = 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->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->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, cmd->pdu,
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;
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_REJECTED:
default:
return ISCSI_TMF_RSP_REJECTED;
}
}
void
iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_tm_rsp *hdr)
{
struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
hdr->itt = 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);
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);
}
EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
static int
iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
u32 tx_size = 0;
iscsit_build_task_mgt_rsp(cmd, conn, hdr);
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, 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;
return 0;
}
static bool iscsit_check_inaddr_any(struct iscsi_np *np)
{
bool ret = false;
if (np->np_sockaddr.ss_family == AF_INET6) {
const struct sockaddr_in6 sin6 = {
.sin6_addr = IN6ADDR_ANY_INIT };
struct sockaddr_in6 *sock_in6 =
(struct sockaddr_in6 *)&np->np_sockaddr;
if (!memcmp(sock_in6->sin6_addr.s6_addr,
sin6.sin6_addr.s6_addr, 16))
ret = true;
} else {
struct sockaddr_in * sock_in =
(struct sockaddr_in *)&np->np_sockaddr;
if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
ret = true;
}
return ret;
}
#define SENDTARGETS_BUF_LIMIT 32768U
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[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
SENDTARGETS_BUF_LIMIT);
payload = kzalloc(buffer_len, GFP_KERNEL);
if (!payload) {
pr_err("Unable to allocate memory for sendtargets"
" response.\n");
return -ENOMEM;
}
/*
* Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
* explicit case..
*/
if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
text_ptr = strchr(text_in, '=');
if (!text_ptr) {
pr_err("Unable to locate '=' string in text_in:"
" %s\n", text_in);
kfree(payload);
return -EINVAL;
}
/*
* Skip over '=' character..
*/
text_ptr += 1;
}
spin_lock(&tiqn_lock);
list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
strcmp(tiqn->tiqn, text_ptr)) {
continue;
}
len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
len += 1;
if ((len + payload_len) > buffer_len) {
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) {
struct iscsi_np *np = tpg_np->tpg_np;
bool inaddr_any = iscsit_check_inaddr_any(np);
len = sprintf(buf, "TargetAddress="
"%s:%hu,%hu",
(inaddr_any == false) ?
np->np_ip : conn->local_ip,
(inaddr_any == false) ?
np->np_port : conn->local_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;
if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
break;
}
spin_unlock(&tiqn_lock);
cmd->buf_ptr = payload;
return payload_len;
}
int
iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_text_rsp *hdr)
{
int text_length, padding;
text_length = iscsit_build_sendtargets_response(cmd);
if (text_length < 0)
return text_length;
hdr->opcode = ISCSI_OP_TEXT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
padding = ((-text_length) & 3);
hton24(hdr->dlength, text_length);
hdr->itt = 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);
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 text_length + padding;
}
EXPORT_SYMBOL(iscsit_build_text_rsp);
/*
* 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 iscsi_text_rsp *)cmd->pdu;
struct kvec *iov;
u32 tx_size = 0;
int text_length, iov_count = 0, rc;
rc = iscsit_build_text_rsp(cmd, conn, hdr);
if (rc < 0)
return rc;
text_length = rc;
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;
tx_size += (ISCSI_HDR_LEN + text_length);
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 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,
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,
cmd->data_crc);
}
cmd->iov_misc_count = iov_count;
cmd->tx_size = tx_size;
return 0;
}
void
iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_reject *hdr)
{
hdr->opcode = ISCSI_OP_REJECT;
hdr->reason = cmd->reject_reason;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, ISCSI_HDR_LEN);
hdr->ffffffff = cpu_to_be32(0xffffffff);
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);
}
EXPORT_SYMBOL(iscsit_build_reject);
static int iscsit_send_reject(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
struct kvec *iov;
u32 iov_count = 0, tx_size;
iscsit_build_reject(cmd, conn, hdr);
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, 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, 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;
}
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);
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);
set_cpus_allowed_ptr(p, conn->conn_cpumask);
}
static int
iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
{
int ret;
switch (state) {
case ISTATE_SEND_R2T:
ret = iscsit_send_r2t(cmd, conn);
if (ret < 0)
goto err;
break;
case ISTATE_REMOVE:
spin_lock_bh(&conn->cmd_lock);
list_del(&cmd->i_conn_node);
spin_unlock_bh(&conn->cmd_lock);
iscsit_free_cmd(cmd, false);
break;
case ISTATE_SEND_NOPIN_WANT_RESPONSE:
iscsit_mod_nopin_response_timer(conn);
ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
if (ret < 0)
goto err;
break;
case ISTATE_SEND_NOPIN_NO_RESPONSE:
ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
if (ret < 0)
goto err;
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);
goto err;
}
return 0;
err:
return -1;
}
static int
iscsit_handle_immediate_queue(struct iscsi_conn *conn)
{
struct iscsit_transport *t = conn->conn_transport;
struct iscsi_queue_req *qr;
struct iscsi_cmd *cmd;
u8 state;
int ret;
while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
atomic_set(&conn->check_immediate_queue, 0);
cmd = qr->cmd;
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);
ret = t->iscsit_immediate_queue(conn, cmd, state);
if (ret < 0)
return ret;
}
return 0;
}
static int
iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
{
int ret;
check_rsp_state:
switch (state) {
case ISTATE_SEND_DATAIN:
ret = iscsit_send_datain(cmd, conn);
if (ret < 0)
goto err;
else if (!ret)
/* more drs */
goto check_rsp_state;
else if (ret == 1) {
/* all done */
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
if (atomic_read(&conn->check_immediate_queue))
return 1;
return 0;
} else if (ret == 2) {
/* Still must send status,
SCF_TRANSPORT_TASK_SENSE was set */
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SEND_STATUS;
spin_unlock_bh(&cmd->istate_lock);
state = ISTATE_SEND_STATUS;
goto check_rsp_state;
}
break;
case ISTATE_SEND_STATUS:
case ISTATE_SEND_STATUS_RECOVERY:
ret = iscsit_send_response(cmd, conn);
break;
case ISTATE_SEND_LOGOUTRSP:
ret = iscsit_send_logout(cmd, conn);
break;
case ISTATE_SEND_ASYNCMSG:
ret = iscsit_send_conn_drop_async_message(
cmd, conn);
break;
case ISTATE_SEND_NOPIN:
ret = iscsit_send_nopin(cmd, conn);
break;
case ISTATE_SEND_REJECT:
ret = iscsit_send_reject(cmd, conn);
break;
case ISTATE_SEND_TASKMGTRSP:
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:
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);
goto err;
}
if (ret < 0)
goto err;
if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
iscsit_tx_thread_wait_for_tcp(conn);
iscsit_unmap_iovec(cmd);
goto err;
}
iscsit_unmap_iovec(cmd);
switch (state) {
case ISTATE_SEND_LOGOUTRSP:
if (!iscsit_logout_post_handler(cmd, conn))
goto restart;
/* fall through */
case ISTATE_SEND_STATUS:
case ISTATE_SEND_ASYNCMSG:
case ISTATE_SEND_NOPIN:
case ISTATE_SEND_STATUS_RECOVERY:
case ISTATE_SEND_TEXTRSP:
case ISTATE_SEND_TASKMGTRSP:
case ISTATE_SEND_REJECT:
spin_lock_bh(&cmd->istate_lock);
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,
cmd->i_state, conn->cid);
goto err;
}
if (atomic_read(&conn->check_immediate_queue))
return 1;
return 0;
err:
return -1;
restart:
return -EAGAIN;
}
static int iscsit_handle_response_queue(struct iscsi_conn *conn)
{
struct iscsit_transport *t = conn->conn_transport;
struct iscsi_queue_req *qr;
struct iscsi_cmd *cmd;
u8 state;
int ret;
while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
cmd = qr->cmd;
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);
ret = t->iscsit_response_queue(conn, cmd, state);
if (ret == 1 || ret < 0)
return ret;
}
return 0;
}
int iscsi_target_tx_thread(void *arg)
{
int ret = 0;
struct iscsi_conn *conn;
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;
ret = 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);
wait_event_interruptible(conn->queues_wq,
!iscsit_conn_all_queues_empty(conn) ||
ts->status == ISCSI_THREAD_SET_RESET);
if ((ts->status == ISCSI_THREAD_SET_RESET) ||
signal_pending(current))
goto transport_err;
get_immediate:
ret = iscsit_handle_immediate_queue(conn);
if (ret < 0)
goto transport_err;
ret = iscsit_handle_response_queue(conn);
if (ret == 1)
goto get_immediate;
else if (ret == -EAGAIN)
goto restart;
else if (ret < 0)
goto transport_err;
}
transport_err:
iscsit_take_action_for_connection_exit(conn);
goto restart;
out:
return 0;
}
static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
{
struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
struct iscsi_cmd *cmd;
int ret = 0;
switch (hdr->opcode & ISCSI_OPCODE_MASK) {
case ISCSI_OP_SCSI_CMD:
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
goto reject;
ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
break;
case ISCSI_OP_SCSI_DATA_OUT:
ret = iscsit_handle_data_out(conn, buf);
break;
case ISCSI_OP_NOOP_OUT:
cmd = NULL;
if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
goto reject;
}
ret = iscsit_handle_nop_out(conn, cmd, buf);
break;
case ISCSI_OP_SCSI_TMFUNC:
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
goto reject;
ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
break;
case ISCSI_OP_TEXT:
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
goto reject;
ret = iscsit_handle_text_cmd(conn, cmd, buf);
break;
case ISCSI_OP_LOGOUT:
cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
if (!cmd)
goto reject;
ret = iscsit_handle_logout_cmd(conn, cmd, buf);
if (ret > 0)
wait_for_completion_timeout(&conn->conn_logout_comp,
SECONDS_FOR_LOGOUT_COMP * HZ);
break;
case ISCSI_OP_SNACK:
ret = iscsit_handle_snack(conn, buf);
break;
default:
pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Cannot recover from unknown"
" opcode while ERL=0, closing iSCSI connection.\n");
return -1;
}
if (!conn->conn_ops->OFMarker) {
pr_err("Unable to recover from unknown"
" opcode while OFMarker=No, closing iSCSI"
" connection.\n");
return -1;
}
if (iscsit_recover_from_unknown_opcode(conn) < 0) {
pr_err("Unable to recover from unknown"
" opcode, closing iSCSI connection.\n");
return -1;
}
break;
}
return ret;
reject:
return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
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;
if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
struct completion comp;
int rc;
init_completion(&comp);
rc = wait_for_completion_interruptible(&comp);
if (rc < 0)
goto transport_err;
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;
}
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(conn, ISCSI_REASON_PROTOCOL_ERROR,
buffer);
goto transport_err;
}
ret = iscsi_target_rx_opcode(conn, buffer);
if (ret < 0)
goto transport_err;
}
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_conn_node) {
list_del(&cmd->i_conn_node);
spin_unlock_bh(&conn->cmd_lock);
iscsit_increment_maxcmdsn(cmd, sess);
iscsit_free_cmd(cmd, true);
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_conn_node) {
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)
sock_release(conn->sock);
if (conn->conn_transport->iscsit_free_conn)
conn->conn_transport->iscsit_free_conn(conn);
iscsit_put_transport(conn->conn_transport);
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);
target_put_session(sess->se_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);
target_put_session(sess->se_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.
*/
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;
}
EXPORT_SYMBOL(iscsit_logout_post_handler);
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);
target_put_session(sess->se_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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