1051 lines
28 KiB
C
1051 lines
28 KiB
C
/*
|
|
* iSCSI Initiator over TCP/IP Data-Path
|
|
*
|
|
* Copyright (C) 2004 Dmitry Yusupov
|
|
* Copyright (C) 2004 Alex Aizman
|
|
* Copyright (C) 2005 - 2006 Mike Christie
|
|
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
|
|
* maintained by open-iscsi@googlegroups.com
|
|
*
|
|
* 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.
|
|
*
|
|
* See the file COPYING included with this distribution for more details.
|
|
*
|
|
* Credits:
|
|
* Christoph Hellwig
|
|
* FUJITA Tomonori
|
|
* Arne Redlich
|
|
* Zhenyu Wang
|
|
*/
|
|
|
|
#include <crypto/hash.h>
|
|
#include <linux/types.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched/mm.h>
|
|
#include <linux/file.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/kfifo.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/module.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <net/tcp.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_transport_iscsi.h>
|
|
|
|
#include "iscsi_tcp.h"
|
|
|
|
MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
|
|
"Dmitry Yusupov <dmitry_yus@yahoo.com>, "
|
|
"Alex Aizman <itn780@yahoo.com>");
|
|
MODULE_DESCRIPTION("iSCSI/TCP data-path");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
|
|
static struct scsi_host_template iscsi_sw_tcp_sht;
|
|
static struct iscsi_transport iscsi_sw_tcp_transport;
|
|
|
|
static unsigned int iscsi_max_lun = ~0;
|
|
module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
|
|
|
|
static int iscsi_sw_tcp_dbg;
|
|
module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
|
|
S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
|
|
"Set to 1 to turn on, and zero to turn off. Default is off.");
|
|
|
|
#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
|
|
do { \
|
|
if (iscsi_sw_tcp_dbg) \
|
|
iscsi_conn_printk(KERN_INFO, _conn, \
|
|
"%s " dbg_fmt, \
|
|
__func__, ##arg); \
|
|
} while (0);
|
|
|
|
|
|
/**
|
|
* iscsi_sw_tcp_recv - TCP receive in sendfile fashion
|
|
* @rd_desc: read descriptor
|
|
* @skb: socket buffer
|
|
* @offset: offset in skb
|
|
* @len: skb->len - offset
|
|
*/
|
|
static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
|
|
unsigned int offset, size_t len)
|
|
{
|
|
struct iscsi_conn *conn = rd_desc->arg.data;
|
|
unsigned int consumed, total_consumed = 0;
|
|
int status;
|
|
|
|
ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
|
|
|
|
do {
|
|
status = 0;
|
|
consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
|
|
offset += consumed;
|
|
total_consumed += consumed;
|
|
} while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
|
|
|
|
ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
|
|
skb->len - offset, status);
|
|
return total_consumed;
|
|
}
|
|
|
|
/**
|
|
* iscsi_sw_sk_state_check - check socket state
|
|
* @sk: socket
|
|
*
|
|
* If the socket is in CLOSE or CLOSE_WAIT we should
|
|
* not close the connection if there is still some
|
|
* data pending.
|
|
*
|
|
* Must be called with sk_callback_lock.
|
|
*/
|
|
static inline int iscsi_sw_sk_state_check(struct sock *sk)
|
|
{
|
|
struct iscsi_conn *conn = sk->sk_user_data;
|
|
|
|
if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
|
|
(conn->session->state != ISCSI_STATE_LOGGING_OUT) &&
|
|
!atomic_read(&sk->sk_rmem_alloc)) {
|
|
ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
|
|
iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
|
|
return -ECONNRESET;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void iscsi_sw_tcp_data_ready(struct sock *sk)
|
|
{
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
read_descriptor_t rd_desc;
|
|
|
|
read_lock_bh(&sk->sk_callback_lock);
|
|
conn = sk->sk_user_data;
|
|
if (!conn) {
|
|
read_unlock_bh(&sk->sk_callback_lock);
|
|
return;
|
|
}
|
|
tcp_conn = conn->dd_data;
|
|
|
|
/*
|
|
* Use rd_desc to pass 'conn' to iscsi_tcp_recv.
|
|
* We set count to 1 because we want the network layer to
|
|
* hand us all the skbs that are available. iscsi_tcp_recv
|
|
* handled pdus that cross buffers or pdus that still need data.
|
|
*/
|
|
rd_desc.arg.data = conn;
|
|
rd_desc.count = 1;
|
|
tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
|
|
|
|
iscsi_sw_sk_state_check(sk);
|
|
|
|
/* If we had to (atomically) map a highmem page,
|
|
* unmap it now. */
|
|
iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
|
|
read_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void iscsi_sw_tcp_state_change(struct sock *sk)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn;
|
|
struct iscsi_conn *conn;
|
|
void (*old_state_change)(struct sock *);
|
|
|
|
read_lock_bh(&sk->sk_callback_lock);
|
|
conn = sk->sk_user_data;
|
|
if (!conn) {
|
|
read_unlock_bh(&sk->sk_callback_lock);
|
|
return;
|
|
}
|
|
|
|
iscsi_sw_sk_state_check(sk);
|
|
|
|
tcp_conn = conn->dd_data;
|
|
tcp_sw_conn = tcp_conn->dd_data;
|
|
old_state_change = tcp_sw_conn->old_state_change;
|
|
|
|
read_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
old_state_change(sk);
|
|
}
|
|
|
|
/**
|
|
* iscsi_write_space - Called when more output buffer space is available
|
|
* @sk: socket space is available for
|
|
**/
|
|
static void iscsi_sw_tcp_write_space(struct sock *sk)
|
|
{
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn;
|
|
void (*old_write_space)(struct sock *);
|
|
|
|
read_lock_bh(&sk->sk_callback_lock);
|
|
conn = sk->sk_user_data;
|
|
if (!conn) {
|
|
read_unlock_bh(&sk->sk_callback_lock);
|
|
return;
|
|
}
|
|
|
|
tcp_conn = conn->dd_data;
|
|
tcp_sw_conn = tcp_conn->dd_data;
|
|
old_write_space = tcp_sw_conn->old_write_space;
|
|
read_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
old_write_space(sk);
|
|
|
|
ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
|
|
iscsi_conn_queue_work(conn);
|
|
}
|
|
|
|
static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct sock *sk = tcp_sw_conn->sock->sk;
|
|
|
|
/* assign new callbacks */
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sk->sk_user_data = conn;
|
|
tcp_sw_conn->old_data_ready = sk->sk_data_ready;
|
|
tcp_sw_conn->old_state_change = sk->sk_state_change;
|
|
tcp_sw_conn->old_write_space = sk->sk_write_space;
|
|
sk->sk_data_ready = iscsi_sw_tcp_data_ready;
|
|
sk->sk_state_change = iscsi_sw_tcp_state_change;
|
|
sk->sk_write_space = iscsi_sw_tcp_write_space;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void
|
|
iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct sock *sk = tcp_sw_conn->sock->sk;
|
|
|
|
/* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sk->sk_user_data = NULL;
|
|
sk->sk_data_ready = tcp_sw_conn->old_data_ready;
|
|
sk->sk_state_change = tcp_sw_conn->old_state_change;
|
|
sk->sk_write_space = tcp_sw_conn->old_write_space;
|
|
sk->sk_no_check_tx = 0;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* iscsi_sw_tcp_xmit_segment - transmit segment
|
|
* @tcp_conn: the iSCSI TCP connection
|
|
* @segment: the buffer to transmnit
|
|
*
|
|
* This function transmits as much of the buffer as
|
|
* the network layer will accept, and returns the number of
|
|
* bytes transmitted.
|
|
*
|
|
* If CRC hashing is enabled, the function will compute the
|
|
* hash as it goes. When the entire segment has been transmitted,
|
|
* it will retrieve the hash value and send it as well.
|
|
*/
|
|
static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment)
|
|
{
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct socket *sk = tcp_sw_conn->sock;
|
|
unsigned int copied = 0;
|
|
int r = 0;
|
|
|
|
while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
|
|
struct scatterlist *sg;
|
|
unsigned int offset, copy;
|
|
int flags = 0;
|
|
|
|
r = 0;
|
|
offset = segment->copied;
|
|
copy = segment->size - offset;
|
|
|
|
if (segment->total_copied + segment->size < segment->total_size)
|
|
flags |= MSG_MORE;
|
|
|
|
/* Use sendpage if we can; else fall back to sendmsg */
|
|
if (!segment->data) {
|
|
sg = segment->sg;
|
|
offset += segment->sg_offset + sg->offset;
|
|
r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
|
|
copy, flags);
|
|
} else {
|
|
struct msghdr msg = { .msg_flags = flags };
|
|
struct kvec iov = {
|
|
.iov_base = segment->data + offset,
|
|
.iov_len = copy
|
|
};
|
|
|
|
r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
|
|
}
|
|
|
|
if (r < 0) {
|
|
iscsi_tcp_segment_unmap(segment);
|
|
return r;
|
|
}
|
|
copied += r;
|
|
}
|
|
return copied;
|
|
}
|
|
|
|
/**
|
|
* iscsi_sw_tcp_xmit - TCP transmit
|
|
* @conn: iscsi connection
|
|
**/
|
|
static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
|
|
unsigned int consumed = 0;
|
|
int rc = 0;
|
|
|
|
while (1) {
|
|
rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
|
|
/*
|
|
* We may not have been able to send data because the conn
|
|
* is getting stopped. libiscsi will know so propagate err
|
|
* for it to do the right thing.
|
|
*/
|
|
if (rc == -EAGAIN)
|
|
return rc;
|
|
else if (rc < 0) {
|
|
rc = ISCSI_ERR_XMIT_FAILED;
|
|
goto error;
|
|
} else if (rc == 0)
|
|
break;
|
|
|
|
consumed += rc;
|
|
|
|
if (segment->total_copied >= segment->total_size) {
|
|
if (segment->done != NULL) {
|
|
rc = segment->done(tcp_conn, segment);
|
|
if (rc != 0)
|
|
goto error;
|
|
}
|
|
}
|
|
}
|
|
|
|
ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
|
|
|
|
conn->txdata_octets += consumed;
|
|
return consumed;
|
|
|
|
error:
|
|
/* Transmit error. We could initiate error recovery
|
|
* here. */
|
|
ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
|
|
iscsi_conn_failure(conn, rc);
|
|
return -EIO;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
|
|
* @conn: iscsi connection
|
|
*/
|
|
static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
|
|
|
|
return segment->total_copied - segment->total_size;
|
|
}
|
|
|
|
static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
unsigned int noreclaim_flag;
|
|
int rc = 0;
|
|
|
|
noreclaim_flag = memalloc_noreclaim_save();
|
|
|
|
while (iscsi_sw_tcp_xmit_qlen(conn)) {
|
|
rc = iscsi_sw_tcp_xmit(conn);
|
|
if (rc == 0) {
|
|
rc = -EAGAIN;
|
|
break;
|
|
}
|
|
if (rc < 0)
|
|
break;
|
|
rc = 0;
|
|
}
|
|
|
|
memalloc_noreclaim_restore(noreclaim_flag);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* This is called when we're done sending the header.
|
|
* Simply copy the data_segment to the send segment, and return.
|
|
*/
|
|
static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment)
|
|
{
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
|
|
tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
|
|
ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
|
|
"Header done. Next segment size %u total_size %u\n",
|
|
tcp_sw_conn->out.segment.size,
|
|
tcp_sw_conn->out.segment.total_size);
|
|
return 0;
|
|
}
|
|
|
|
static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
|
|
size_t hdrlen)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
|
|
ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
|
|
"digest enabled" : "digest disabled");
|
|
|
|
/* Clear the data segment - needs to be filled in by the
|
|
* caller using iscsi_tcp_send_data_prep() */
|
|
memset(&tcp_sw_conn->out.data_segment, 0,
|
|
sizeof(struct iscsi_segment));
|
|
|
|
/* If header digest is enabled, compute the CRC and
|
|
* place the digest into the same buffer. We make
|
|
* sure that both iscsi_tcp_task and mtask have
|
|
* sufficient room.
|
|
*/
|
|
if (conn->hdrdgst_en) {
|
|
iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,
|
|
hdr + hdrlen);
|
|
hdrlen += ISCSI_DIGEST_SIZE;
|
|
}
|
|
|
|
/* Remember header pointer for later, when we need
|
|
* to decide whether there's a payload to go along
|
|
* with the header. */
|
|
tcp_sw_conn->out.hdr = hdr;
|
|
|
|
iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
|
|
iscsi_sw_tcp_send_hdr_done, NULL);
|
|
}
|
|
|
|
/*
|
|
* Prepare the send buffer for the payload data.
|
|
* Padding and checksumming will all be taken care
|
|
* of by the iscsi_segment routines.
|
|
*/
|
|
static int
|
|
iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
|
|
unsigned int count, unsigned int offset,
|
|
unsigned int len)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct ahash_request *tx_hash = NULL;
|
|
unsigned int hdr_spec_len;
|
|
|
|
ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
|
|
conn->datadgst_en ?
|
|
"digest enabled" : "digest disabled");
|
|
|
|
/* Make sure the datalen matches what the caller
|
|
said he would send. */
|
|
hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
|
|
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
|
|
|
|
if (conn->datadgst_en)
|
|
tx_hash = tcp_sw_conn->tx_hash;
|
|
|
|
return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
|
|
sg, count, offset, len,
|
|
NULL, tx_hash);
|
|
}
|
|
|
|
static void
|
|
iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
|
|
size_t len)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct ahash_request *tx_hash = NULL;
|
|
unsigned int hdr_spec_len;
|
|
|
|
ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
|
|
"digest enabled" : "digest disabled");
|
|
|
|
/* Make sure the datalen matches what the caller
|
|
said he would send. */
|
|
hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
|
|
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
|
|
|
|
if (conn->datadgst_en)
|
|
tx_hash = tcp_sw_conn->tx_hash;
|
|
|
|
iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
|
|
data, len, NULL, tx_hash);
|
|
}
|
|
|
|
static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
|
|
unsigned int offset, unsigned int count)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
int err = 0;
|
|
|
|
iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
if (!task->sc)
|
|
iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
|
|
else {
|
|
struct scsi_data_buffer *sdb = scsi_out(task->sc);
|
|
|
|
err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
|
|
sdb->table.nents, offset,
|
|
count);
|
|
}
|
|
|
|
if (err) {
|
|
/* got invalid offset/len */
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
|
|
{
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
|
|
task->hdr = task->dd_data + sizeof(*tcp_task);
|
|
task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
|
|
return 0;
|
|
}
|
|
|
|
static struct iscsi_cls_conn *
|
|
iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
|
|
uint32_t conn_idx)
|
|
{
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_cls_conn *cls_conn;
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn;
|
|
struct crypto_ahash *tfm;
|
|
|
|
cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
|
|
conn_idx);
|
|
if (!cls_conn)
|
|
return NULL;
|
|
conn = cls_conn->dd_data;
|
|
tcp_conn = conn->dd_data;
|
|
tcp_sw_conn = tcp_conn->dd_data;
|
|
|
|
tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(tfm))
|
|
goto free_conn;
|
|
|
|
tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
|
|
if (!tcp_sw_conn->tx_hash)
|
|
goto free_tfm;
|
|
ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);
|
|
|
|
tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
|
|
if (!tcp_sw_conn->rx_hash)
|
|
goto free_tx_hash;
|
|
ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);
|
|
|
|
tcp_conn->rx_hash = tcp_sw_conn->rx_hash;
|
|
|
|
return cls_conn;
|
|
|
|
free_tx_hash:
|
|
ahash_request_free(tcp_sw_conn->tx_hash);
|
|
free_tfm:
|
|
crypto_free_ahash(tfm);
|
|
free_conn:
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"Could not create connection due to crc32c "
|
|
"loading error. Make sure the crc32c "
|
|
"module is built as a module or into the "
|
|
"kernel\n");
|
|
iscsi_tcp_conn_teardown(cls_conn);
|
|
return NULL;
|
|
}
|
|
|
|
static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct socket *sock = tcp_sw_conn->sock;
|
|
|
|
if (!sock)
|
|
return;
|
|
|
|
sock_hold(sock->sk);
|
|
iscsi_sw_tcp_conn_restore_callbacks(conn);
|
|
sock_put(sock->sk);
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
tcp_sw_conn->sock = NULL;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
sockfd_put(sock);
|
|
}
|
|
|
|
static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
|
|
iscsi_sw_tcp_release_conn(conn);
|
|
|
|
ahash_request_free(tcp_sw_conn->rx_hash);
|
|
if (tcp_sw_conn->tx_hash) {
|
|
struct crypto_ahash *tfm;
|
|
|
|
tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);
|
|
ahash_request_free(tcp_sw_conn->tx_hash);
|
|
crypto_free_ahash(tfm);
|
|
}
|
|
|
|
iscsi_tcp_conn_teardown(cls_conn);
|
|
}
|
|
|
|
static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct socket *sock = tcp_sw_conn->sock;
|
|
|
|
/* userspace may have goofed up and not bound us */
|
|
if (!sock)
|
|
return;
|
|
|
|
sock->sk->sk_err = EIO;
|
|
wake_up_interruptible(sk_sleep(sock->sk));
|
|
|
|
/* stop xmit side */
|
|
iscsi_suspend_tx(conn);
|
|
|
|
/* stop recv side and release socket */
|
|
iscsi_sw_tcp_release_conn(conn);
|
|
|
|
iscsi_conn_stop(cls_conn, flag);
|
|
}
|
|
|
|
static int
|
|
iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
|
|
struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
|
|
int is_leading)
|
|
{
|
|
struct iscsi_session *session = cls_session->dd_data;
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct sock *sk;
|
|
struct socket *sock;
|
|
int err;
|
|
|
|
/* lookup for existing socket */
|
|
sock = sockfd_lookup((int)transport_eph, &err);
|
|
if (!sock) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"sockfd_lookup failed %d\n", err);
|
|
return -EEXIST;
|
|
}
|
|
|
|
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
|
|
if (err)
|
|
goto free_socket;
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
/* bind iSCSI connection and socket */
|
|
tcp_sw_conn->sock = sock;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
/* setup Socket parameters */
|
|
sk = sock->sk;
|
|
sk->sk_reuse = SK_CAN_REUSE;
|
|
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
|
|
sk->sk_allocation = GFP_ATOMIC;
|
|
sk_set_memalloc(sk);
|
|
|
|
iscsi_sw_tcp_conn_set_callbacks(conn);
|
|
tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
|
|
/*
|
|
* set receive state machine into initial state
|
|
*/
|
|
iscsi_tcp_hdr_recv_prep(tcp_conn);
|
|
return 0;
|
|
|
|
free_socket:
|
|
sockfd_put(sock);
|
|
return err;
|
|
}
|
|
|
|
static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf,
|
|
int buflen)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
|
|
switch(param) {
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
iscsi_set_param(cls_conn, param, buf, buflen);
|
|
break;
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
iscsi_set_param(cls_conn, param, buf, buflen);
|
|
tcp_sw_conn->sendpage = conn->datadgst_en ?
|
|
sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
|
|
break;
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
return iscsi_tcp_set_max_r2t(conn, buf);
|
|
default:
|
|
return iscsi_set_param(cls_conn, param, buf, buflen);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
struct sockaddr_in6 addr;
|
|
int rc, len;
|
|
|
|
switch(param) {
|
|
case ISCSI_PARAM_CONN_PORT:
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
case ISCSI_PARAM_LOCAL_PORT:
|
|
spin_lock_bh(&conn->session->frwd_lock);
|
|
if (!tcp_sw_conn || !tcp_sw_conn->sock) {
|
|
spin_unlock_bh(&conn->session->frwd_lock);
|
|
return -ENOTCONN;
|
|
}
|
|
if (param == ISCSI_PARAM_LOCAL_PORT)
|
|
rc = kernel_getsockname(tcp_sw_conn->sock,
|
|
(struct sockaddr *)&addr, &len);
|
|
else
|
|
rc = kernel_getpeername(tcp_sw_conn->sock,
|
|
(struct sockaddr *)&addr, &len);
|
|
spin_unlock_bh(&conn->session->frwd_lock);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return iscsi_conn_get_addr_param((struct sockaddr_storage *)
|
|
&addr, param, buf);
|
|
default:
|
|
return iscsi_conn_get_param(cls_conn, param, buf);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
|
|
enum iscsi_host_param param, char *buf)
|
|
{
|
|
struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
|
|
struct iscsi_session *session = tcp_sw_host->session;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn;
|
|
struct sockaddr_in6 addr;
|
|
int rc, len;
|
|
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_IPADDRESS:
|
|
if (!session)
|
|
return -ENOTCONN;
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
conn = session->leadconn;
|
|
if (!conn) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
return -ENOTCONN;
|
|
}
|
|
tcp_conn = conn->dd_data;
|
|
|
|
tcp_sw_conn = tcp_conn->dd_data;
|
|
if (!tcp_sw_conn->sock) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
rc = kernel_getsockname(tcp_sw_conn->sock,
|
|
(struct sockaddr *)&addr, &len);
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return iscsi_conn_get_addr_param((struct sockaddr_storage *)
|
|
&addr, param, buf);
|
|
default:
|
|
return iscsi_host_get_param(shost, param, buf);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
|
|
struct iscsi_stats *stats)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
|
|
|
|
stats->custom_length = 3;
|
|
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
|
|
stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
|
|
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
|
|
stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
|
|
strcpy(stats->custom[2].desc, "eh_abort_cnt");
|
|
stats->custom[2].value = conn->eh_abort_cnt;
|
|
|
|
iscsi_tcp_conn_get_stats(cls_conn, stats);
|
|
}
|
|
|
|
static struct iscsi_cls_session *
|
|
iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
|
|
uint16_t qdepth, uint32_t initial_cmdsn)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
struct iscsi_sw_tcp_host *tcp_sw_host;
|
|
struct Scsi_Host *shost;
|
|
|
|
if (ep) {
|
|
printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
|
|
return NULL;
|
|
}
|
|
|
|
shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
|
|
sizeof(struct iscsi_sw_tcp_host), 1);
|
|
if (!shost)
|
|
return NULL;
|
|
shost->transportt = iscsi_sw_tcp_scsi_transport;
|
|
shost->cmd_per_lun = qdepth;
|
|
shost->max_lun = iscsi_max_lun;
|
|
shost->max_id = 0;
|
|
shost->max_channel = 0;
|
|
shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
|
|
|
|
if (iscsi_host_add(shost, NULL))
|
|
goto free_host;
|
|
|
|
cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
|
|
cmds_max, 0,
|
|
sizeof(struct iscsi_tcp_task) +
|
|
sizeof(struct iscsi_sw_tcp_hdrbuf),
|
|
initial_cmdsn, 0);
|
|
if (!cls_session)
|
|
goto remove_host;
|
|
session = cls_session->dd_data;
|
|
tcp_sw_host = iscsi_host_priv(shost);
|
|
tcp_sw_host->session = session;
|
|
|
|
shost->can_queue = session->scsi_cmds_max;
|
|
if (iscsi_tcp_r2tpool_alloc(session))
|
|
goto remove_session;
|
|
return cls_session;
|
|
|
|
remove_session:
|
|
iscsi_session_teardown(cls_session);
|
|
remove_host:
|
|
iscsi_host_remove(shost);
|
|
free_host:
|
|
iscsi_host_free(shost);
|
|
return NULL;
|
|
}
|
|
|
|
static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
|
|
|
|
iscsi_tcp_r2tpool_free(cls_session->dd_data);
|
|
iscsi_session_teardown(cls_session);
|
|
|
|
iscsi_host_remove(shost);
|
|
iscsi_host_free(shost);
|
|
}
|
|
|
|
static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
|
|
{
|
|
switch (param_type) {
|
|
case ISCSI_HOST_PARAM:
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
|
case ISCSI_HOST_PARAM_HWADDRESS:
|
|
case ISCSI_HOST_PARAM_IPADDRESS:
|
|
case ISCSI_HOST_PARAM_INITIATOR_NAME:
|
|
return S_IRUGO;
|
|
default:
|
|
return 0;
|
|
}
|
|
case ISCSI_PARAM:
|
|
switch (param) {
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
case ISCSI_PARAM_CONN_PORT:
|
|
case ISCSI_PARAM_LOCAL_PORT:
|
|
case ISCSI_PARAM_EXP_STATSN:
|
|
case ISCSI_PARAM_PERSISTENT_ADDRESS:
|
|
case ISCSI_PARAM_PERSISTENT_PORT:
|
|
case ISCSI_PARAM_PING_TMO:
|
|
case ISCSI_PARAM_RECV_TMO:
|
|
case ISCSI_PARAM_INITIAL_R2T_EN:
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
case ISCSI_PARAM_IMM_DATA_EN:
|
|
case ISCSI_PARAM_FIRST_BURST:
|
|
case ISCSI_PARAM_MAX_BURST:
|
|
case ISCSI_PARAM_PDU_INORDER_EN:
|
|
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
|
case ISCSI_PARAM_ERL:
|
|
case ISCSI_PARAM_TARGET_NAME:
|
|
case ISCSI_PARAM_TPGT:
|
|
case ISCSI_PARAM_USERNAME:
|
|
case ISCSI_PARAM_PASSWORD:
|
|
case ISCSI_PARAM_USERNAME_IN:
|
|
case ISCSI_PARAM_PASSWORD_IN:
|
|
case ISCSI_PARAM_FAST_ABORT:
|
|
case ISCSI_PARAM_ABORT_TMO:
|
|
case ISCSI_PARAM_LU_RESET_TMO:
|
|
case ISCSI_PARAM_TGT_RESET_TMO:
|
|
case ISCSI_PARAM_IFACE_NAME:
|
|
case ISCSI_PARAM_INITIATOR_NAME:
|
|
return S_IRUGO;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
|
|
{
|
|
set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
|
|
{
|
|
struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
|
|
struct iscsi_session *session = tcp_sw_host->session;
|
|
struct iscsi_conn *conn = session->leadconn;
|
|
|
|
if (conn->datadgst_en)
|
|
sdev->request_queue->backing_dev_info->capabilities
|
|
|= BDI_CAP_STABLE_WRITES;
|
|
blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
|
|
blk_queue_dma_alignment(sdev->request_queue, 0);
|
|
return 0;
|
|
}
|
|
|
|
static struct scsi_host_template iscsi_sw_tcp_sht = {
|
|
.module = THIS_MODULE,
|
|
.name = "iSCSI Initiator over TCP/IP",
|
|
.queuecommand = iscsi_queuecommand,
|
|
.change_queue_depth = scsi_change_queue_depth,
|
|
.can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
|
|
.sg_tablesize = 4096,
|
|
.max_sectors = 0xFFFF,
|
|
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
|
|
.eh_timed_out = iscsi_eh_cmd_timed_out,
|
|
.eh_abort_handler = iscsi_eh_abort,
|
|
.eh_device_reset_handler= iscsi_eh_device_reset,
|
|
.eh_target_reset_handler = iscsi_eh_recover_target,
|
|
.use_clustering = DISABLE_CLUSTERING,
|
|
.slave_alloc = iscsi_sw_tcp_slave_alloc,
|
|
.slave_configure = iscsi_sw_tcp_slave_configure,
|
|
.target_alloc = iscsi_target_alloc,
|
|
.proc_name = "iscsi_tcp",
|
|
.this_id = -1,
|
|
.track_queue_depth = 1,
|
|
};
|
|
|
|
static struct iscsi_transport iscsi_sw_tcp_transport = {
|
|
.owner = THIS_MODULE,
|
|
.name = "tcp",
|
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
|
|
| CAP_DATADGST,
|
|
/* session management */
|
|
.create_session = iscsi_sw_tcp_session_create,
|
|
.destroy_session = iscsi_sw_tcp_session_destroy,
|
|
/* connection management */
|
|
.create_conn = iscsi_sw_tcp_conn_create,
|
|
.bind_conn = iscsi_sw_tcp_conn_bind,
|
|
.destroy_conn = iscsi_sw_tcp_conn_destroy,
|
|
.attr_is_visible = iscsi_sw_tcp_attr_is_visible,
|
|
.set_param = iscsi_sw_tcp_conn_set_param,
|
|
.get_conn_param = iscsi_sw_tcp_conn_get_param,
|
|
.get_session_param = iscsi_session_get_param,
|
|
.start_conn = iscsi_conn_start,
|
|
.stop_conn = iscsi_sw_tcp_conn_stop,
|
|
/* iscsi host params */
|
|
.get_host_param = iscsi_sw_tcp_host_get_param,
|
|
.set_host_param = iscsi_host_set_param,
|
|
/* IO */
|
|
.send_pdu = iscsi_conn_send_pdu,
|
|
.get_stats = iscsi_sw_tcp_conn_get_stats,
|
|
/* iscsi task/cmd helpers */
|
|
.init_task = iscsi_tcp_task_init,
|
|
.xmit_task = iscsi_tcp_task_xmit,
|
|
.cleanup_task = iscsi_tcp_cleanup_task,
|
|
/* low level pdu helpers */
|
|
.xmit_pdu = iscsi_sw_tcp_pdu_xmit,
|
|
.init_pdu = iscsi_sw_tcp_pdu_init,
|
|
.alloc_pdu = iscsi_sw_tcp_pdu_alloc,
|
|
/* recovery */
|
|
.session_recovery_timedout = iscsi_session_recovery_timedout,
|
|
};
|
|
|
|
static int __init iscsi_sw_tcp_init(void)
|
|
{
|
|
if (iscsi_max_lun < 1) {
|
|
printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
|
|
iscsi_max_lun);
|
|
return -EINVAL;
|
|
}
|
|
|
|
iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
|
|
&iscsi_sw_tcp_transport);
|
|
if (!iscsi_sw_tcp_scsi_transport)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit iscsi_sw_tcp_exit(void)
|
|
{
|
|
iscsi_unregister_transport(&iscsi_sw_tcp_transport);
|
|
}
|
|
|
|
module_init(iscsi_sw_tcp_init);
|
|
module_exit(iscsi_sw_tcp_exit);
|