![Karen Xie](/assets/img/avatar_default.png)
virt_to_page() call should not be used on kernel text and data addresses. virt_to_page() is used by sg_init_one(). So change padbuf to be allocated within iscsi_segment. Signed-off-by: Karen Xie <kxie@chelsio.com> Acked-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
1163 lines
31 KiB
C
1163 lines
31 KiB
C
/*
|
|
* iSCSI over TCP/IP Data-Path lib
|
|
*
|
|
* 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 <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/file.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/kfifo.h>
|
|
#include <linux/scatterlist.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");
|
|
#undef DEBUG_TCP
|
|
|
|
#ifdef DEBUG_TCP
|
|
#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
|
|
#else
|
|
#define debug_tcp(fmt...)
|
|
#endif
|
|
|
|
static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment);
|
|
|
|
/*
|
|
* Scatterlist handling: inside the iscsi_segment, we
|
|
* remember an index into the scatterlist, and set data/size
|
|
* to the current scatterlist entry. For highmem pages, we
|
|
* kmap as needed.
|
|
*
|
|
* Note that the page is unmapped when we return from
|
|
* TCP's data_ready handler, so we may end up mapping and
|
|
* unmapping the same page repeatedly. The whole reason
|
|
* for this is that we shouldn't keep the page mapped
|
|
* outside the softirq.
|
|
*/
|
|
|
|
/**
|
|
* iscsi_tcp_segment_init_sg - init indicated scatterlist entry
|
|
* @segment: the buffer object
|
|
* @sg: scatterlist
|
|
* @offset: byte offset into that sg entry
|
|
*
|
|
* This function sets up the segment so that subsequent
|
|
* data is copied to the indicated sg entry, at the given
|
|
* offset.
|
|
*/
|
|
static inline void
|
|
iscsi_tcp_segment_init_sg(struct iscsi_segment *segment,
|
|
struct scatterlist *sg, unsigned int offset)
|
|
{
|
|
segment->sg = sg;
|
|
segment->sg_offset = offset;
|
|
segment->size = min(sg->length - offset,
|
|
segment->total_size - segment->total_copied);
|
|
segment->data = NULL;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_segment_map - map the current S/G page
|
|
* @segment: iscsi_segment
|
|
* @recv: 1 if called from recv path
|
|
*
|
|
* We only need to possibly kmap data if scatter lists are being used,
|
|
* because the iscsi passthrough and internal IO paths will never use high
|
|
* mem pages.
|
|
*/
|
|
static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
|
|
{
|
|
struct scatterlist *sg;
|
|
|
|
if (segment->data != NULL || !segment->sg)
|
|
return;
|
|
|
|
sg = segment->sg;
|
|
BUG_ON(segment->sg_mapped);
|
|
BUG_ON(sg->length == 0);
|
|
|
|
/*
|
|
* If the page count is greater than one it is ok to send
|
|
* to the network layer's zero copy send path. If not we
|
|
* have to go the slow sendmsg path. We always map for the
|
|
* recv path.
|
|
*/
|
|
if (page_count(sg_page(sg)) >= 1 && !recv)
|
|
return;
|
|
|
|
debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit",
|
|
segment);
|
|
segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0);
|
|
segment->data = segment->sg_mapped + sg->offset + segment->sg_offset;
|
|
}
|
|
|
|
void iscsi_tcp_segment_unmap(struct iscsi_segment *segment)
|
|
{
|
|
debug_tcp("iscsi_tcp_segment_unmap %p\n", segment);
|
|
|
|
if (segment->sg_mapped) {
|
|
debug_tcp("iscsi_tcp_segment_unmap valid\n");
|
|
kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0);
|
|
segment->sg_mapped = NULL;
|
|
segment->data = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_segment_unmap);
|
|
|
|
/*
|
|
* Splice the digest buffer into the buffer
|
|
*/
|
|
static inline void
|
|
iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest)
|
|
{
|
|
segment->data = digest;
|
|
segment->digest_len = ISCSI_DIGEST_SIZE;
|
|
segment->total_size += ISCSI_DIGEST_SIZE;
|
|
segment->size = ISCSI_DIGEST_SIZE;
|
|
segment->copied = 0;
|
|
segment->sg = NULL;
|
|
segment->hash = NULL;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_segment_done - check whether the segment is complete
|
|
* @tcp_conn: iscsi tcp connection
|
|
* @segment: iscsi segment to check
|
|
* @recv: set to one of this is called from the recv path
|
|
* @copied: number of bytes copied
|
|
*
|
|
* Check if we're done receiving this segment. If the receive
|
|
* buffer is full but we expect more data, move on to the
|
|
* next entry in the scatterlist.
|
|
*
|
|
* If the amount of data we received isn't a multiple of 4,
|
|
* we will transparently receive the pad bytes, too.
|
|
*
|
|
* This function must be re-entrant.
|
|
*/
|
|
int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment, int recv,
|
|
unsigned copied)
|
|
{
|
|
struct scatterlist sg;
|
|
unsigned int pad;
|
|
|
|
debug_tcp("copied %u %u size %u %s\n", segment->copied, copied,
|
|
segment->size, recv ? "recv" : "xmit");
|
|
if (segment->hash && copied) {
|
|
/*
|
|
* If a segment is kmapd we must unmap it before sending
|
|
* to the crypto layer since that will try to kmap it again.
|
|
*/
|
|
iscsi_tcp_segment_unmap(segment);
|
|
|
|
if (!segment->data) {
|
|
sg_init_table(&sg, 1);
|
|
sg_set_page(&sg, sg_page(segment->sg), copied,
|
|
segment->copied + segment->sg_offset +
|
|
segment->sg->offset);
|
|
} else
|
|
sg_init_one(&sg, segment->data + segment->copied,
|
|
copied);
|
|
crypto_hash_update(segment->hash, &sg, copied);
|
|
}
|
|
|
|
segment->copied += copied;
|
|
if (segment->copied < segment->size) {
|
|
iscsi_tcp_segment_map(segment, recv);
|
|
return 0;
|
|
}
|
|
|
|
segment->total_copied += segment->copied;
|
|
segment->copied = 0;
|
|
segment->size = 0;
|
|
|
|
/* Unmap the current scatterlist page, if there is one. */
|
|
iscsi_tcp_segment_unmap(segment);
|
|
|
|
/* Do we have more scatterlist entries? */
|
|
debug_tcp("total copied %u total size %u\n", segment->total_copied,
|
|
segment->total_size);
|
|
if (segment->total_copied < segment->total_size) {
|
|
/* Proceed to the next entry in the scatterlist. */
|
|
iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg),
|
|
0);
|
|
iscsi_tcp_segment_map(segment, recv);
|
|
BUG_ON(segment->size == 0);
|
|
return 0;
|
|
}
|
|
|
|
/* Do we need to handle padding? */
|
|
if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) {
|
|
pad = iscsi_padding(segment->total_copied);
|
|
if (pad != 0) {
|
|
debug_tcp("consume %d pad bytes\n", pad);
|
|
segment->total_size += pad;
|
|
segment->size = pad;
|
|
segment->data = segment->padbuf;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set us up for transferring the data digest. hdr digest
|
|
* is completely handled in hdr done function.
|
|
*/
|
|
if (segment->hash) {
|
|
crypto_hash_final(segment->hash, segment->digest);
|
|
iscsi_tcp_segment_splice_digest(segment,
|
|
recv ? segment->recv_digest : segment->digest);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_segment_done);
|
|
|
|
/**
|
|
* iscsi_tcp_segment_recv - copy data to segment
|
|
* @tcp_conn: the iSCSI TCP connection
|
|
* @segment: the buffer to copy to
|
|
* @ptr: data pointer
|
|
* @len: amount of data available
|
|
*
|
|
* This function copies up to @len bytes to the
|
|
* given buffer, and returns the number of bytes
|
|
* consumed, which can actually be less than @len.
|
|
*
|
|
* If hash digest is enabled, the function will update the
|
|
* hash while copying.
|
|
* Combining these two operations doesn't buy us a lot (yet),
|
|
* but in the future we could implement combined copy+crc,
|
|
* just way we do for network layer checksums.
|
|
*/
|
|
static int
|
|
iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment, const void *ptr,
|
|
unsigned int len)
|
|
{
|
|
unsigned int copy = 0, copied = 0;
|
|
|
|
while (!iscsi_tcp_segment_done(tcp_conn, segment, 1, copy)) {
|
|
if (copied == len) {
|
|
debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n",
|
|
len);
|
|
break;
|
|
}
|
|
|
|
copy = min(len - copied, segment->size - segment->copied);
|
|
debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy);
|
|
memcpy(segment->data + segment->copied, ptr + copied, copy);
|
|
copied += copy;
|
|
}
|
|
return copied;
|
|
}
|
|
|
|
inline void
|
|
iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen,
|
|
unsigned char digest[ISCSI_DIGEST_SIZE])
|
|
{
|
|
struct scatterlist sg;
|
|
|
|
sg_init_one(&sg, hdr, hdrlen);
|
|
crypto_hash_digest(hash, &sg, hdrlen, digest);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header);
|
|
|
|
static inline int
|
|
iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment)
|
|
{
|
|
if (!segment->digest_len)
|
|
return 1;
|
|
|
|
if (memcmp(segment->recv_digest, segment->digest,
|
|
segment->digest_len)) {
|
|
debug_scsi("digest mismatch\n");
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Helper function to set up segment buffer
|
|
*/
|
|
static inline void
|
|
__iscsi_segment_init(struct iscsi_segment *segment, size_t size,
|
|
iscsi_segment_done_fn_t *done, struct hash_desc *hash)
|
|
{
|
|
memset(segment, 0, sizeof(*segment));
|
|
segment->total_size = size;
|
|
segment->done = done;
|
|
|
|
if (hash) {
|
|
segment->hash = hash;
|
|
crypto_hash_init(hash);
|
|
}
|
|
}
|
|
|
|
inline void
|
|
iscsi_segment_init_linear(struct iscsi_segment *segment, void *data,
|
|
size_t size, iscsi_segment_done_fn_t *done,
|
|
struct hash_desc *hash)
|
|
{
|
|
__iscsi_segment_init(segment, size, done, hash);
|
|
segment->data = data;
|
|
segment->size = size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_segment_init_linear);
|
|
|
|
inline int
|
|
iscsi_segment_seek_sg(struct iscsi_segment *segment,
|
|
struct scatterlist *sg_list, unsigned int sg_count,
|
|
unsigned int offset, size_t size,
|
|
iscsi_segment_done_fn_t *done, struct hash_desc *hash)
|
|
{
|
|
struct scatterlist *sg;
|
|
unsigned int i;
|
|
|
|
debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n",
|
|
offset, size);
|
|
__iscsi_segment_init(segment, size, done, hash);
|
|
for_each_sg(sg_list, sg, sg_count, i) {
|
|
debug_scsi("sg %d, len %u offset %u\n", i, sg->length,
|
|
sg->offset);
|
|
if (offset < sg->length) {
|
|
iscsi_tcp_segment_init_sg(segment, sg, offset);
|
|
return 0;
|
|
}
|
|
offset -= sg->length;
|
|
}
|
|
|
|
return ISCSI_ERR_DATA_OFFSET;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg);
|
|
|
|
/**
|
|
* iscsi_tcp_hdr_recv_prep - prep segment for hdr reception
|
|
* @tcp_conn: iscsi connection to prep for
|
|
*
|
|
* This function always passes NULL for the hash argument, because when this
|
|
* function is called we do not yet know the final size of the header and want
|
|
* to delay the digest processing until we know that.
|
|
*/
|
|
void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)
|
|
{
|
|
debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn,
|
|
tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : "");
|
|
iscsi_segment_init_linear(&tcp_conn->in.segment,
|
|
tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr),
|
|
iscsi_tcp_hdr_recv_done, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_hdr_recv_prep);
|
|
|
|
/*
|
|
* Handle incoming reply to any other type of command
|
|
*/
|
|
static int
|
|
iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment)
|
|
{
|
|
struct iscsi_conn *conn = tcp_conn->iscsi_conn;
|
|
int rc = 0;
|
|
|
|
if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
|
|
return ISCSI_ERR_DATA_DGST;
|
|
|
|
rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr,
|
|
conn->data, tcp_conn->in.datalen);
|
|
if (rc)
|
|
return rc;
|
|
|
|
iscsi_tcp_hdr_recv_prep(tcp_conn);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn)
|
|
{
|
|
struct iscsi_conn *conn = tcp_conn->iscsi_conn;
|
|
struct hash_desc *rx_hash = NULL;
|
|
|
|
if (conn->datadgst_en &
|
|
!(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
|
|
rx_hash = tcp_conn->rx_hash;
|
|
|
|
iscsi_segment_init_linear(&tcp_conn->in.segment,
|
|
conn->data, tcp_conn->in.datalen,
|
|
iscsi_tcp_data_recv_done, rx_hash);
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_cleanup_task - free tcp_task resources
|
|
* @task: iscsi task
|
|
*
|
|
* must be called with session lock
|
|
*/
|
|
void iscsi_tcp_cleanup_task(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
struct iscsi_r2t_info *r2t;
|
|
|
|
/* nothing to do for mgmt or pending tasks */
|
|
if (!task->sc || task->state == ISCSI_TASK_PENDING)
|
|
return;
|
|
|
|
/* flush task's r2t queues */
|
|
while (__kfifo_get(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) {
|
|
__kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
|
|
sizeof(void*));
|
|
debug_scsi("iscsi_tcp_cleanup_task pending r2t dropped\n");
|
|
}
|
|
|
|
r2t = tcp_task->r2t;
|
|
if (r2t != NULL) {
|
|
__kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
|
|
sizeof(void*));
|
|
tcp_task->r2t = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_cleanup_task);
|
|
|
|
/**
|
|
* iscsi_tcp_data_in - SCSI Data-In Response processing
|
|
* @conn: iscsi connection
|
|
* @task: scsi command task
|
|
*/
|
|
static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
|
|
int datasn = be32_to_cpu(rhdr->datasn);
|
|
unsigned total_in_length = scsi_in(task->sc)->length;
|
|
|
|
iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr);
|
|
if (tcp_conn->in.datalen == 0)
|
|
return 0;
|
|
|
|
if (tcp_task->exp_datasn != datasn) {
|
|
debug_tcp("%s: task->exp_datasn(%d) != rhdr->datasn(%d)\n",
|
|
__func__, tcp_task->exp_datasn, datasn);
|
|
return ISCSI_ERR_DATASN;
|
|
}
|
|
|
|
tcp_task->exp_datasn++;
|
|
|
|
tcp_task->data_offset = be32_to_cpu(rhdr->offset);
|
|
if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) {
|
|
debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
|
|
__func__, tcp_task->data_offset,
|
|
tcp_conn->in.datalen, total_in_length);
|
|
return ISCSI_ERR_DATA_OFFSET;
|
|
}
|
|
|
|
conn->datain_pdus_cnt++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_r2t_rsp - iSCSI R2T Response processing
|
|
* @conn: iscsi connection
|
|
* @task: scsi command task
|
|
*/
|
|
static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
|
|
struct iscsi_r2t_info *r2t;
|
|
int r2tsn = be32_to_cpu(rhdr->r2tsn);
|
|
int rc;
|
|
|
|
if (tcp_conn->in.datalen) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"invalid R2t with datalen %d\n",
|
|
tcp_conn->in.datalen);
|
|
return ISCSI_ERR_DATALEN;
|
|
}
|
|
|
|
if (tcp_task->exp_datasn != r2tsn){
|
|
debug_tcp("%s: task->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
|
|
__func__, tcp_task->exp_datasn, r2tsn);
|
|
return ISCSI_ERR_R2TSN;
|
|
}
|
|
|
|
/* fill-in new R2T associated with the task */
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
|
|
|
|
if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) {
|
|
iscsi_conn_printk(KERN_INFO, conn,
|
|
"dropping R2T itt %d in recovery.\n",
|
|
task->itt);
|
|
return 0;
|
|
}
|
|
|
|
rc = __kfifo_get(tcp_task->r2tpool.queue, (void*)&r2t, sizeof(void*));
|
|
if (!rc) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. "
|
|
"Target has sent more R2Ts than it "
|
|
"negotiated for or driver has has leaked.\n");
|
|
return ISCSI_ERR_PROTO;
|
|
}
|
|
|
|
r2t->exp_statsn = rhdr->statsn;
|
|
r2t->data_length = be32_to_cpu(rhdr->data_length);
|
|
if (r2t->data_length == 0) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"invalid R2T with zero data len\n");
|
|
__kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
|
|
sizeof(void*));
|
|
return ISCSI_ERR_DATALEN;
|
|
}
|
|
|
|
if (r2t->data_length > session->max_burst)
|
|
debug_scsi("invalid R2T with data len %u and max burst %u."
|
|
"Attempting to execute request.\n",
|
|
r2t->data_length, session->max_burst);
|
|
|
|
r2t->data_offset = be32_to_cpu(rhdr->data_offset);
|
|
if (r2t->data_offset + r2t->data_length > scsi_out(task->sc)->length) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"invalid R2T with data len %u at offset %u "
|
|
"and total length %d\n", r2t->data_length,
|
|
r2t->data_offset, scsi_out(task->sc)->length);
|
|
__kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
|
|
sizeof(void*));
|
|
return ISCSI_ERR_DATALEN;
|
|
}
|
|
|
|
r2t->ttt = rhdr->ttt; /* no flip */
|
|
r2t->datasn = 0;
|
|
r2t->sent = 0;
|
|
|
|
tcp_task->exp_datasn = r2tsn + 1;
|
|
__kfifo_put(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*));
|
|
conn->r2t_pdus_cnt++;
|
|
|
|
iscsi_requeue_task(task);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle incoming reply to DataIn command
|
|
*/
|
|
static int
|
|
iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment)
|
|
{
|
|
struct iscsi_conn *conn = tcp_conn->iscsi_conn;
|
|
struct iscsi_hdr *hdr = tcp_conn->in.hdr;
|
|
int rc;
|
|
|
|
if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
|
|
return ISCSI_ERR_DATA_DGST;
|
|
|
|
/* check for non-exceptional status */
|
|
if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
|
|
rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
iscsi_tcp_hdr_recv_prep(tcp_conn);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_hdr_dissect - process PDU header
|
|
* @conn: iSCSI connection
|
|
* @hdr: PDU header
|
|
*
|
|
* This function analyzes the header of the PDU received,
|
|
* and performs several sanity checks. If the PDU is accompanied
|
|
* by data, the receive buffer is set up to copy the incoming data
|
|
* to the correct location.
|
|
*/
|
|
static int
|
|
iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
|
|
{
|
|
int rc = 0, opcode, ahslen;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_task *task;
|
|
|
|
/* verify PDU length */
|
|
tcp_conn->in.datalen = ntoh24(hdr->dlength);
|
|
if (tcp_conn->in.datalen > conn->max_recv_dlength) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"iscsi_tcp: datalen %d > %d\n",
|
|
tcp_conn->in.datalen, conn->max_recv_dlength);
|
|
return ISCSI_ERR_DATALEN;
|
|
}
|
|
|
|
/* Additional header segments. So far, we don't
|
|
* process additional headers.
|
|
*/
|
|
ahslen = hdr->hlength << 2;
|
|
|
|
opcode = hdr->opcode & ISCSI_OPCODE_MASK;
|
|
/* verify itt (itt encoding: age+cid+itt) */
|
|
rc = iscsi_verify_itt(conn, hdr->itt);
|
|
if (rc)
|
|
return rc;
|
|
|
|
debug_tcp("opcode 0x%x ahslen %d datalen %d\n",
|
|
opcode, ahslen, tcp_conn->in.datalen);
|
|
|
|
switch(opcode) {
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
spin_lock(&conn->session->lock);
|
|
task = iscsi_itt_to_ctask(conn, hdr->itt);
|
|
if (!task)
|
|
rc = ISCSI_ERR_BAD_ITT;
|
|
else
|
|
rc = iscsi_tcp_data_in(conn, task);
|
|
if (rc) {
|
|
spin_unlock(&conn->session->lock);
|
|
break;
|
|
}
|
|
|
|
if (tcp_conn->in.datalen) {
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
struct hash_desc *rx_hash = NULL;
|
|
struct scsi_data_buffer *sdb = scsi_in(task->sc);
|
|
|
|
/*
|
|
* Setup copy of Data-In into the Scsi_Cmnd
|
|
* Scatterlist case:
|
|
* We set up the iscsi_segment to point to the next
|
|
* scatterlist entry to copy to. As we go along,
|
|
* we move on to the next scatterlist entry and
|
|
* update the digest per-entry.
|
|
*/
|
|
if (conn->datadgst_en &&
|
|
!(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
|
|
rx_hash = tcp_conn->rx_hash;
|
|
|
|
debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, "
|
|
"datalen=%d)\n", tcp_conn,
|
|
tcp_task->data_offset,
|
|
tcp_conn->in.datalen);
|
|
rc = iscsi_segment_seek_sg(&tcp_conn->in.segment,
|
|
sdb->table.sgl,
|
|
sdb->table.nents,
|
|
tcp_task->data_offset,
|
|
tcp_conn->in.datalen,
|
|
iscsi_tcp_process_data_in,
|
|
rx_hash);
|
|
spin_unlock(&conn->session->lock);
|
|
return rc;
|
|
}
|
|
rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
|
|
spin_unlock(&conn->session->lock);
|
|
break;
|
|
case ISCSI_OP_SCSI_CMD_RSP:
|
|
if (tcp_conn->in.datalen) {
|
|
iscsi_tcp_data_recv_prep(tcp_conn);
|
|
return 0;
|
|
}
|
|
rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
|
|
break;
|
|
case ISCSI_OP_R2T:
|
|
spin_lock(&conn->session->lock);
|
|
task = iscsi_itt_to_ctask(conn, hdr->itt);
|
|
if (!task)
|
|
rc = ISCSI_ERR_BAD_ITT;
|
|
else if (ahslen)
|
|
rc = ISCSI_ERR_AHSLEN;
|
|
else if (task->sc->sc_data_direction == DMA_TO_DEVICE)
|
|
rc = iscsi_tcp_r2t_rsp(conn, task);
|
|
else
|
|
rc = ISCSI_ERR_PROTO;
|
|
spin_unlock(&conn->session->lock);
|
|
break;
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
case ISCSI_OP_TEXT_RSP:
|
|
case ISCSI_OP_REJECT:
|
|
case ISCSI_OP_ASYNC_EVENT:
|
|
/*
|
|
* It is possible that we could get a PDU with a buffer larger
|
|
* than 8K, but there are no targets that currently do this.
|
|
* For now we fail until we find a vendor that needs it
|
|
*/
|
|
if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"iscsi_tcp: received buffer of "
|
|
"len %u but conn buffer is only %u "
|
|
"(opcode %0x)\n",
|
|
tcp_conn->in.datalen,
|
|
ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
}
|
|
|
|
/* If there's data coming in with the response,
|
|
* receive it to the connection's buffer.
|
|
*/
|
|
if (tcp_conn->in.datalen) {
|
|
iscsi_tcp_data_recv_prep(tcp_conn);
|
|
return 0;
|
|
}
|
|
/* fall through */
|
|
case ISCSI_OP_LOGOUT_RSP:
|
|
case ISCSI_OP_NOOP_IN:
|
|
case ISCSI_OP_SCSI_TMFUNC_RSP:
|
|
rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
|
|
break;
|
|
default:
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
}
|
|
|
|
if (rc == 0) {
|
|
/* Anything that comes with data should have
|
|
* been handled above. */
|
|
if (tcp_conn->in.datalen)
|
|
return ISCSI_ERR_PROTO;
|
|
iscsi_tcp_hdr_recv_prep(tcp_conn);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_hdr_recv_done - process PDU header
|
|
*
|
|
* This is the callback invoked when the PDU header has
|
|
* been received. If the header is followed by additional
|
|
* header segments, we go back for more data.
|
|
*/
|
|
static int
|
|
iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment)
|
|
{
|
|
struct iscsi_conn *conn = tcp_conn->iscsi_conn;
|
|
struct iscsi_hdr *hdr;
|
|
|
|
/* Check if there are additional header segments
|
|
* *prior* to computing the digest, because we
|
|
* may need to go back to the caller for more.
|
|
*/
|
|
hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf;
|
|
if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) {
|
|
/* Bump the header length - the caller will
|
|
* just loop around and get the AHS for us, and
|
|
* call again. */
|
|
unsigned int ahslen = hdr->hlength << 2;
|
|
|
|
/* Make sure we don't overflow */
|
|
if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf))
|
|
return ISCSI_ERR_AHSLEN;
|
|
|
|
segment->total_size += ahslen;
|
|
segment->size += ahslen;
|
|
return 0;
|
|
}
|
|
|
|
/* We're done processing the header. See if we're doing
|
|
* header digests; if so, set up the recv_digest buffer
|
|
* and go back for more. */
|
|
if (conn->hdrdgst_en &&
|
|
!(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) {
|
|
if (segment->digest_len == 0) {
|
|
/*
|
|
* Even if we offload the digest processing we
|
|
* splice it in so we can increment the skb/segment
|
|
* counters in preparation for the data segment.
|
|
*/
|
|
iscsi_tcp_segment_splice_digest(segment,
|
|
segment->recv_digest);
|
|
return 0;
|
|
}
|
|
|
|
iscsi_tcp_dgst_header(tcp_conn->rx_hash, hdr,
|
|
segment->total_copied - ISCSI_DIGEST_SIZE,
|
|
segment->digest);
|
|
|
|
if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
|
|
return ISCSI_ERR_HDR_DGST;
|
|
}
|
|
|
|
tcp_conn->in.hdr = hdr;
|
|
return iscsi_tcp_hdr_dissect(conn, hdr);
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_recv_segment_is_hdr - tests if we are reading in a header
|
|
* @tcp_conn: iscsi tcp conn
|
|
*
|
|
* returns non zero if we are currently processing or setup to process
|
|
* a header.
|
|
*/
|
|
inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn)
|
|
{
|
|
return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_recv_segment_is_hdr);
|
|
|
|
/**
|
|
* iscsi_tcp_recv_skb - Process skb
|
|
* @conn: iscsi connection
|
|
* @skb: network buffer with header and/or data segment
|
|
* @offset: offset in skb
|
|
* @offload: bool indicating if transfer was offloaded
|
|
*
|
|
* Will return status of transfer in status. And will return
|
|
* number of bytes copied.
|
|
*/
|
|
int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb,
|
|
unsigned int offset, bool offloaded, int *status)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_segment *segment = &tcp_conn->in.segment;
|
|
struct skb_seq_state seq;
|
|
unsigned int consumed = 0;
|
|
int rc = 0;
|
|
|
|
debug_tcp("in %d bytes\n", skb->len - offset);
|
|
|
|
if (unlikely(conn->suspend_rx)) {
|
|
debug_tcp("conn %d Rx suspended!\n", conn->id);
|
|
*status = ISCSI_TCP_SUSPENDED;
|
|
return 0;
|
|
}
|
|
|
|
if (offloaded) {
|
|
segment->total_copied = segment->total_size;
|
|
goto segment_done;
|
|
}
|
|
|
|
skb_prepare_seq_read(skb, offset, skb->len, &seq);
|
|
while (1) {
|
|
unsigned int avail;
|
|
const u8 *ptr;
|
|
|
|
avail = skb_seq_read(consumed, &ptr, &seq);
|
|
if (avail == 0) {
|
|
debug_tcp("no more data avail. Consumed %d\n",
|
|
consumed);
|
|
*status = ISCSI_TCP_SKB_DONE;
|
|
skb_abort_seq_read(&seq);
|
|
goto skb_done;
|
|
}
|
|
BUG_ON(segment->copied >= segment->size);
|
|
|
|
debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail);
|
|
rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail);
|
|
BUG_ON(rc == 0);
|
|
consumed += rc;
|
|
|
|
if (segment->total_copied >= segment->total_size) {
|
|
skb_abort_seq_read(&seq);
|
|
goto segment_done;
|
|
}
|
|
}
|
|
|
|
segment_done:
|
|
*status = ISCSI_TCP_SEGMENT_DONE;
|
|
debug_tcp("segment done\n");
|
|
rc = segment->done(tcp_conn, segment);
|
|
if (rc != 0) {
|
|
*status = ISCSI_TCP_CONN_ERR;
|
|
debug_tcp("Error receiving PDU, errno=%d\n", rc);
|
|
iscsi_conn_failure(conn, rc);
|
|
return 0;
|
|
}
|
|
/* The done() functions sets up the next segment. */
|
|
|
|
skb_done:
|
|
conn->rxdata_octets += consumed;
|
|
return consumed;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb);
|
|
|
|
/**
|
|
* iscsi_tcp_task_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
|
|
* @conn: iscsi connection
|
|
* @task: scsi command task
|
|
* @sc: scsi command
|
|
*/
|
|
int iscsi_tcp_task_init(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
struct iscsi_conn *conn = task->conn;
|
|
struct scsi_cmnd *sc = task->sc;
|
|
int err;
|
|
|
|
if (!sc) {
|
|
/*
|
|
* mgmt tasks do not have a scatterlist since they come
|
|
* in from the iscsi interface.
|
|
*/
|
|
debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id,
|
|
task->itt);
|
|
|
|
return conn->session->tt->init_pdu(task, 0, task->data_count);
|
|
}
|
|
|
|
BUG_ON(__kfifo_len(tcp_task->r2tqueue));
|
|
tcp_task->exp_datasn = 0;
|
|
|
|
/* Prepare PDU, optionally w/ immediate data */
|
|
debug_scsi("task deq [cid %d itt 0x%x imm %d unsol %d]\n",
|
|
conn->id, task->itt, task->imm_count,
|
|
task->unsol_r2t.data_length);
|
|
|
|
err = conn->session->tt->init_pdu(task, 0, task->imm_count);
|
|
if (err)
|
|
return err;
|
|
task->imm_count = 0;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_task_init);
|
|
|
|
static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_session *session = task->conn->session;
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
struct iscsi_r2t_info *r2t = NULL;
|
|
|
|
if (iscsi_task_has_unsol_data(task))
|
|
r2t = &task->unsol_r2t;
|
|
else {
|
|
spin_lock_bh(&session->lock);
|
|
if (tcp_task->r2t) {
|
|
r2t = tcp_task->r2t;
|
|
/* Continue with this R2T? */
|
|
if (r2t->data_length <= r2t->sent) {
|
|
debug_scsi(" done with r2t %p\n", r2t);
|
|
__kfifo_put(tcp_task->r2tpool.queue,
|
|
(void *)&tcp_task->r2t,
|
|
sizeof(void *));
|
|
tcp_task->r2t = r2t = NULL;
|
|
}
|
|
}
|
|
|
|
if (r2t == NULL) {
|
|
__kfifo_get(tcp_task->r2tqueue,
|
|
(void *)&tcp_task->r2t, sizeof(void *));
|
|
r2t = tcp_task->r2t;
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
}
|
|
|
|
return r2t;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_task_xmit - xmit normal PDU task
|
|
* @task: iscsi command task
|
|
*
|
|
* We're expected to return 0 when everything was transmitted succesfully,
|
|
* -EAGAIN if there's still data in the queue, or != 0 for any other kind
|
|
* of error.
|
|
*/
|
|
int iscsi_tcp_task_xmit(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_r2t_info *r2t;
|
|
int rc = 0;
|
|
|
|
flush:
|
|
/* Flush any pending data first. */
|
|
rc = session->tt->xmit_pdu(task);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* mgmt command */
|
|
if (!task->sc) {
|
|
if (task->hdr->itt == RESERVED_ITT)
|
|
iscsi_put_task(task);
|
|
return 0;
|
|
}
|
|
|
|
/* Are we done already? */
|
|
if (task->sc->sc_data_direction != DMA_TO_DEVICE)
|
|
return 0;
|
|
|
|
r2t = iscsi_tcp_get_curr_r2t(task);
|
|
if (r2t == NULL) {
|
|
/* Waiting for more R2Ts to arrive. */
|
|
debug_tcp("no R2Ts yet\n");
|
|
return 0;
|
|
}
|
|
|
|
rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT);
|
|
if (rc)
|
|
return rc;
|
|
iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr);
|
|
|
|
debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",
|
|
r2t, r2t->datasn - 1, task->hdr->itt,
|
|
r2t->data_offset + r2t->sent, r2t->data_count);
|
|
|
|
rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent,
|
|
r2t->data_count);
|
|
if (rc)
|
|
return rc;
|
|
r2t->sent += r2t->data_count;
|
|
goto flush;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_task_xmit);
|
|
|
|
struct iscsi_cls_conn *
|
|
iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size,
|
|
uint32_t conn_idx)
|
|
|
|
{
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_cls_conn *cls_conn;
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
|
|
cls_conn = iscsi_conn_setup(cls_session, sizeof(*tcp_conn), conn_idx);
|
|
if (!cls_conn)
|
|
return NULL;
|
|
conn = cls_conn->dd_data;
|
|
/*
|
|
* due to strange issues with iser these are not set
|
|
* in iscsi_conn_setup
|
|
*/
|
|
conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
|
|
|
|
tcp_conn = conn->dd_data;
|
|
tcp_conn->iscsi_conn = conn;
|
|
|
|
tcp_conn->dd_data = kzalloc(dd_data_size, GFP_KERNEL);
|
|
if (!tcp_conn->dd_data) {
|
|
iscsi_conn_teardown(cls_conn);
|
|
return NULL;
|
|
}
|
|
return cls_conn;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup);
|
|
|
|
void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
|
|
kfree(tcp_conn->dd_data);
|
|
iscsi_conn_teardown(cls_conn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown);
|
|
|
|
int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session)
|
|
{
|
|
int i;
|
|
int cmd_i;
|
|
|
|
/*
|
|
* initialize per-task: R2T pool and xmit queue
|
|
*/
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
|
|
struct iscsi_task *task = session->cmds[cmd_i];
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
|
|
/*
|
|
* pre-allocated x2 as much r2ts to handle race when
|
|
* target acks DataOut faster than we data_xmit() queues
|
|
* could replenish r2tqueue.
|
|
*/
|
|
|
|
/* R2T pool */
|
|
if (iscsi_pool_init(&tcp_task->r2tpool,
|
|
session->max_r2t * 2, NULL,
|
|
sizeof(struct iscsi_r2t_info))) {
|
|
goto r2t_alloc_fail;
|
|
}
|
|
|
|
/* R2T xmit queue */
|
|
tcp_task->r2tqueue = kfifo_alloc(
|
|
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
|
|
if (tcp_task->r2tqueue == ERR_PTR(-ENOMEM)) {
|
|
iscsi_pool_free(&tcp_task->r2tpool);
|
|
goto r2t_alloc_fail;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
r2t_alloc_fail:
|
|
for (i = 0; i < cmd_i; i++) {
|
|
struct iscsi_task *task = session->cmds[i];
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
|
|
kfifo_free(tcp_task->r2tqueue);
|
|
iscsi_pool_free(&tcp_task->r2tpool);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_alloc);
|
|
|
|
void iscsi_tcp_r2tpool_free(struct iscsi_session *session)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < session->cmds_max; i++) {
|
|
struct iscsi_task *task = session->cmds[i];
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
|
|
kfifo_free(tcp_task->r2tqueue);
|
|
iscsi_pool_free(&tcp_task->r2tpool);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_free);
|
|
|
|
void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
|
|
struct iscsi_stats *stats)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
|
|
stats->txdata_octets = conn->txdata_octets;
|
|
stats->rxdata_octets = conn->rxdata_octets;
|
|
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
|
|
stats->dataout_pdus = conn->dataout_pdus_cnt;
|
|
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
|
|
stats->datain_pdus = conn->datain_pdus_cnt;
|
|
stats->r2t_pdus = conn->r2t_pdus_cnt;
|
|
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
|
|
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_conn_get_stats);
|