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![Mike Christie](/assets/img/avatar_default.png)
max_cmd_len and max_conn are not really used. max_cmd_len is always 16 and can be set by the LLD. max_conn is always one since we do not support MCS. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2031 lines
54 KiB
C
2031 lines
54 KiB
C
/*
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* iSCSI Initiator over TCP/IP Data-Path
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*
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* Copyright (C) 2004 Dmitry Yusupov
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* Copyright (C) 2004 Alex Aizman
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* Copyright (C) 2005 - 2006 Mike Christie
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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* maintained by open-iscsi@googlegroups.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* See the file COPYING included with this distribution for more details.
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*
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* Credits:
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* Christoph Hellwig
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* FUJITA Tomonori
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* Arne Redlich
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* Zhenyu Wang
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*/
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/inet.h>
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#include <linux/file.h>
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#include <linux/blkdev.h>
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#include <linux/crypto.h>
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#include <linux/delay.h>
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#include <linux/kfifo.h>
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#include <linux/scatterlist.h>
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#include <net/tcp.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include "iscsi_tcp.h"
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MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
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"Alex Aizman <itn780@yahoo.com>");
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MODULE_DESCRIPTION("iSCSI/TCP data-path");
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MODULE_LICENSE("GPL");
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#undef DEBUG_TCP
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#define DEBUG_ASSERT
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#ifdef DEBUG_TCP
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#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
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#else
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#define debug_tcp(fmt...)
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#endif
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#ifndef DEBUG_ASSERT
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#ifdef BUG_ON
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#undef BUG_ON
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#endif
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#define BUG_ON(expr)
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#endif
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static unsigned int iscsi_max_lun = 512;
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module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
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static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
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struct iscsi_segment *segment);
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/*
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* Scatterlist handling: inside the iscsi_segment, we
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* remember an index into the scatterlist, and set data/size
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* to the current scatterlist entry. For highmem pages, we
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* kmap as needed.
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*
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* Note that the page is unmapped when we return from
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* TCP's data_ready handler, so we may end up mapping and
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* unmapping the same page repeatedly. The whole reason
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* for this is that we shouldn't keep the page mapped
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* outside the softirq.
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*/
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/**
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* iscsi_tcp_segment_init_sg - init indicated scatterlist entry
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* @segment: the buffer object
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* @sg: scatterlist
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* @offset: byte offset into that sg entry
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*
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* This function sets up the segment so that subsequent
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* data is copied to the indicated sg entry, at the given
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* offset.
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*/
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static inline void
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iscsi_tcp_segment_init_sg(struct iscsi_segment *segment,
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struct scatterlist *sg, unsigned int offset)
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{
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segment->sg = sg;
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segment->sg_offset = offset;
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segment->size = min(sg->length - offset,
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segment->total_size - segment->total_copied);
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segment->data = NULL;
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}
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/**
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* iscsi_tcp_segment_map - map the current S/G page
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* @segment: iscsi_segment
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* @recv: 1 if called from recv path
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*
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* We only need to possibly kmap data if scatter lists are being used,
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* because the iscsi passthrough and internal IO paths will never use high
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* mem pages.
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*/
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static inline void
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iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
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{
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struct scatterlist *sg;
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if (segment->data != NULL || !segment->sg)
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return;
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sg = segment->sg;
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BUG_ON(segment->sg_mapped);
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BUG_ON(sg->length == 0);
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/*
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* If the page count is greater than one it is ok to send
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* to the network layer's zero copy send path. If not we
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* have to go the slow sendmsg path. We always map for the
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* recv path.
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*/
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if (page_count(sg_page(sg)) >= 1 && !recv)
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return;
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debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit",
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segment);
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segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0);
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segment->data = segment->sg_mapped + sg->offset + segment->sg_offset;
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}
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static inline void
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iscsi_tcp_segment_unmap(struct iscsi_segment *segment)
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{
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debug_tcp("iscsi_tcp_segment_unmap %p\n", segment);
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if (segment->sg_mapped) {
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debug_tcp("iscsi_tcp_segment_unmap valid\n");
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kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0);
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segment->sg_mapped = NULL;
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segment->data = NULL;
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}
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}
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/*
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* Splice the digest buffer into the buffer
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*/
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static inline void
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iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest)
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{
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segment->data = digest;
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segment->digest_len = ISCSI_DIGEST_SIZE;
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segment->total_size += ISCSI_DIGEST_SIZE;
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segment->size = ISCSI_DIGEST_SIZE;
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segment->copied = 0;
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segment->sg = NULL;
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segment->hash = NULL;
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}
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/**
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* iscsi_tcp_segment_done - check whether the segment is complete
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* @segment: iscsi segment to check
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* @recv: set to one of this is called from the recv path
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* @copied: number of bytes copied
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*
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* Check if we're done receiving this segment. If the receive
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* buffer is full but we expect more data, move on to the
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* next entry in the scatterlist.
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*
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* If the amount of data we received isn't a multiple of 4,
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* we will transparently receive the pad bytes, too.
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*
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* This function must be re-entrant.
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*/
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static inline int
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iscsi_tcp_segment_done(struct iscsi_segment *segment, int recv, unsigned copied)
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{
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static unsigned char padbuf[ISCSI_PAD_LEN];
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struct scatterlist sg;
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unsigned int pad;
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debug_tcp("copied %u %u size %u %s\n", segment->copied, copied,
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segment->size, recv ? "recv" : "xmit");
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if (segment->hash && copied) {
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/*
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* If a segment is kmapd we must unmap it before sending
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* to the crypto layer since that will try to kmap it again.
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*/
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iscsi_tcp_segment_unmap(segment);
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if (!segment->data) {
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sg_init_table(&sg, 1);
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sg_set_page(&sg, sg_page(segment->sg), copied,
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segment->copied + segment->sg_offset +
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segment->sg->offset);
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} else
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sg_init_one(&sg, segment->data + segment->copied,
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copied);
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crypto_hash_update(segment->hash, &sg, copied);
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}
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segment->copied += copied;
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if (segment->copied < segment->size) {
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iscsi_tcp_segment_map(segment, recv);
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return 0;
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}
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segment->total_copied += segment->copied;
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segment->copied = 0;
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segment->size = 0;
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/* Unmap the current scatterlist page, if there is one. */
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iscsi_tcp_segment_unmap(segment);
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/* Do we have more scatterlist entries? */
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debug_tcp("total copied %u total size %u\n", segment->total_copied,
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segment->total_size);
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if (segment->total_copied < segment->total_size) {
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/* Proceed to the next entry in the scatterlist. */
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iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg),
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0);
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iscsi_tcp_segment_map(segment, recv);
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BUG_ON(segment->size == 0);
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return 0;
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}
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/* Do we need to handle padding? */
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pad = iscsi_padding(segment->total_copied);
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if (pad != 0) {
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debug_tcp("consume %d pad bytes\n", pad);
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segment->total_size += pad;
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segment->size = pad;
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segment->data = padbuf;
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return 0;
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}
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/*
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* Set us up for transferring the data digest. hdr digest
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* is completely handled in hdr done function.
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*/
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if (segment->hash) {
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crypto_hash_final(segment->hash, segment->digest);
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iscsi_tcp_segment_splice_digest(segment,
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recv ? segment->recv_digest : segment->digest);
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return 0;
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}
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return 1;
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}
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/**
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* iscsi_tcp_xmit_segment - transmit segment
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* @tcp_conn: the iSCSI TCP connection
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* @segment: the buffer to transmnit
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*
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* This function transmits as much of the buffer as
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* the network layer will accept, and returns the number of
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* bytes transmitted.
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*
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* If CRC hashing is enabled, the function will compute the
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* hash as it goes. When the entire segment has been transmitted,
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* it will retrieve the hash value and send it as well.
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*/
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static int
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iscsi_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
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struct iscsi_segment *segment)
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{
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struct socket *sk = tcp_conn->sock;
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unsigned int copied = 0;
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int r = 0;
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while (!iscsi_tcp_segment_done(segment, 0, r)) {
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struct scatterlist *sg;
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unsigned int offset, copy;
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int flags = 0;
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r = 0;
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offset = segment->copied;
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copy = segment->size - offset;
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if (segment->total_copied + segment->size < segment->total_size)
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flags |= MSG_MORE;
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/* Use sendpage if we can; else fall back to sendmsg */
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if (!segment->data) {
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sg = segment->sg;
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offset += segment->sg_offset + sg->offset;
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r = tcp_conn->sendpage(sk, sg_page(sg), offset, copy,
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flags);
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} else {
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struct msghdr msg = { .msg_flags = flags };
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struct kvec iov = {
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.iov_base = segment->data + offset,
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.iov_len = copy
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};
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r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
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}
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if (r < 0) {
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iscsi_tcp_segment_unmap(segment);
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if (copied || r == -EAGAIN)
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break;
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return r;
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}
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copied += r;
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}
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return copied;
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}
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/**
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* iscsi_tcp_segment_recv - copy data to segment
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* @tcp_conn: the iSCSI TCP connection
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* @segment: the buffer to copy to
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* @ptr: data pointer
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* @len: amount of data available
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*
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* This function copies up to @len bytes to the
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* given buffer, and returns the number of bytes
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* consumed, which can actually be less than @len.
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*
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* If hash digest is enabled, the function will update the
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* hash while copying.
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* Combining these two operations doesn't buy us a lot (yet),
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* but in the future we could implement combined copy+crc,
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* just way we do for network layer checksums.
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*/
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static int
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iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn,
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struct iscsi_segment *segment, const void *ptr,
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unsigned int len)
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{
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unsigned int copy = 0, copied = 0;
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while (!iscsi_tcp_segment_done(segment, 1, copy)) {
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if (copied == len) {
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debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n",
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len);
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break;
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}
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copy = min(len - copied, segment->size - segment->copied);
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debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy);
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memcpy(segment->data + segment->copied, ptr + copied, copy);
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copied += copy;
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}
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return copied;
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}
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static inline void
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iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen,
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unsigned char digest[ISCSI_DIGEST_SIZE])
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{
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struct scatterlist sg;
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sg_init_one(&sg, hdr, hdrlen);
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crypto_hash_digest(hash, &sg, hdrlen, digest);
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}
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static inline int
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iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn,
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struct iscsi_segment *segment)
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{
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if (!segment->digest_len)
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return 1;
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if (memcmp(segment->recv_digest, segment->digest,
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segment->digest_len)) {
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debug_scsi("digest mismatch\n");
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return 0;
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}
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return 1;
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}
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/*
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* Helper function to set up segment buffer
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*/
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static inline void
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__iscsi_segment_init(struct iscsi_segment *segment, size_t size,
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iscsi_segment_done_fn_t *done, struct hash_desc *hash)
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{
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memset(segment, 0, sizeof(*segment));
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segment->total_size = size;
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segment->done = done;
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if (hash) {
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segment->hash = hash;
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crypto_hash_init(hash);
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}
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}
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static inline void
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iscsi_segment_init_linear(struct iscsi_segment *segment, void *data,
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size_t size, iscsi_segment_done_fn_t *done,
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struct hash_desc *hash)
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{
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__iscsi_segment_init(segment, size, done, hash);
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segment->data = data;
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segment->size = size;
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}
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static inline int
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iscsi_segment_seek_sg(struct iscsi_segment *segment,
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struct scatterlist *sg_list, unsigned int sg_count,
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unsigned int offset, size_t size,
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iscsi_segment_done_fn_t *done, struct hash_desc *hash)
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{
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struct scatterlist *sg;
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unsigned int i;
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debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n",
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offset, size);
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__iscsi_segment_init(segment, size, done, hash);
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for_each_sg(sg_list, sg, sg_count, i) {
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debug_scsi("sg %d, len %u offset %u\n", i, sg->length,
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sg->offset);
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if (offset < sg->length) {
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iscsi_tcp_segment_init_sg(segment, sg, offset);
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return 0;
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}
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offset -= sg->length;
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}
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return ISCSI_ERR_DATA_OFFSET;
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}
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/**
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* iscsi_tcp_hdr_recv_prep - prep segment for hdr reception
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* @tcp_conn: iscsi connection to prep for
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*
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* This function always passes NULL for the hash argument, because when this
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* function is called we do not yet know the final size of the header and want
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* to delay the digest processing until we know that.
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*/
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static void
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iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)
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{
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debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn,
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tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : "");
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iscsi_segment_init_linear(&tcp_conn->in.segment,
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tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr),
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iscsi_tcp_hdr_recv_done, NULL);
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}
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/*
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* Handle incoming reply to any other type of command
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*/
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static int
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iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn,
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struct iscsi_segment *segment)
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{
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struct iscsi_conn *conn = tcp_conn->iscsi_conn;
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int rc = 0;
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if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
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return ISCSI_ERR_DATA_DGST;
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rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr,
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conn->data, tcp_conn->in.datalen);
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if (rc)
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return rc;
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iscsi_tcp_hdr_recv_prep(tcp_conn);
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return 0;
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}
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static void
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iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn)
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{
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struct iscsi_conn *conn = tcp_conn->iscsi_conn;
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struct hash_desc *rx_hash = NULL;
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if (conn->datadgst_en)
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rx_hash = &tcp_conn->rx_hash;
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iscsi_segment_init_linear(&tcp_conn->in.segment,
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conn->data, tcp_conn->in.datalen,
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iscsi_tcp_data_recv_done, rx_hash);
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}
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/*
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* must be called with session lock
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*/
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static void
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iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
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struct iscsi_r2t_info *r2t;
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/* flush ctask's r2t queues */
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while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
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__kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
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sizeof(void*));
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debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
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|
}
|
|
|
|
r2t = tcp_ctask->r2t;
|
|
if (r2t != NULL) {
|
|
__kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
|
|
sizeof(void*));
|
|
tcp_ctask->r2t = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* iscsi_data_rsp - SCSI Data-In Response processing
|
|
* @conn: iscsi connection
|
|
* @ctask: scsi command task
|
|
**/
|
|
static int
|
|
iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
|
|
struct iscsi_session *session = conn->session;
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
int datasn = be32_to_cpu(rhdr->datasn);
|
|
unsigned total_in_length = scsi_in(sc)->length;
|
|
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
|
|
if (tcp_conn->in.datalen == 0)
|
|
return 0;
|
|
|
|
if (tcp_ctask->exp_datasn != datasn) {
|
|
debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n",
|
|
__FUNCTION__, tcp_ctask->exp_datasn, datasn);
|
|
return ISCSI_ERR_DATASN;
|
|
}
|
|
|
|
tcp_ctask->exp_datasn++;
|
|
|
|
tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
|
|
if (tcp_ctask->data_offset + tcp_conn->in.datalen > total_in_length) {
|
|
debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
|
|
__FUNCTION__, tcp_ctask->data_offset,
|
|
tcp_conn->in.datalen, total_in_length);
|
|
return ISCSI_ERR_DATA_OFFSET;
|
|
}
|
|
|
|
if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
|
|
sc->result = (DID_OK << 16) | rhdr->cmd_status;
|
|
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
|
|
if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
|
|
ISCSI_FLAG_DATA_OVERFLOW)) {
|
|
int res_count = be32_to_cpu(rhdr->residual_count);
|
|
|
|
if (res_count > 0 &&
|
|
(rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
|
|
res_count <= total_in_length))
|
|
scsi_in(sc)->resid = res_count;
|
|
else
|
|
sc->result = (DID_BAD_TARGET << 16) |
|
|
rhdr->cmd_status;
|
|
}
|
|
}
|
|
|
|
conn->datain_pdus_cnt++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_solicit_data_init - initialize first Data-Out
|
|
* @conn: iscsi connection
|
|
* @ctask: scsi command task
|
|
* @r2t: R2T info
|
|
*
|
|
* Notes:
|
|
* Initialize first Data-Out within this R2T sequence and finds
|
|
* proper data_offset within this SCSI command.
|
|
*
|
|
* This function is called with connection lock taken.
|
|
**/
|
|
static void
|
|
iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
struct iscsi_r2t_info *r2t)
|
|
{
|
|
struct iscsi_data *hdr;
|
|
|
|
hdr = &r2t->dtask.hdr;
|
|
memset(hdr, 0, sizeof(struct iscsi_data));
|
|
hdr->ttt = r2t->ttt;
|
|
hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
|
|
r2t->solicit_datasn++;
|
|
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
|
|
memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
|
|
hdr->itt = ctask->hdr->itt;
|
|
hdr->exp_statsn = r2t->exp_statsn;
|
|
hdr->offset = cpu_to_be32(r2t->data_offset);
|
|
if (r2t->data_length > conn->max_xmit_dlength) {
|
|
hton24(hdr->dlength, conn->max_xmit_dlength);
|
|
r2t->data_count = conn->max_xmit_dlength;
|
|
hdr->flags = 0;
|
|
} else {
|
|
hton24(hdr->dlength, r2t->data_length);
|
|
r2t->data_count = r2t->data_length;
|
|
hdr->flags = ISCSI_FLAG_CMD_FINAL;
|
|
}
|
|
conn->dataout_pdus_cnt++;
|
|
|
|
r2t->sent = 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_r2t_rsp - iSCSI R2T Response processing
|
|
* @conn: iscsi connection
|
|
* @ctask: scsi command task
|
|
**/
|
|
static int
|
|
iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_r2t_info *r2t;
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
|
|
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_ctask->exp_datasn != r2tsn){
|
|
debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
|
|
__FUNCTION__, tcp_ctask->exp_datasn, r2tsn);
|
|
return ISCSI_ERR_R2TSN;
|
|
}
|
|
|
|
/* fill-in new R2T associated with the task */
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
|
|
|
|
if (!ctask->sc || session->state != ISCSI_STATE_LOGGED_IN) {
|
|
iscsi_conn_printk(KERN_INFO, conn,
|
|
"dropping R2T itt %d in recovery.\n",
|
|
ctask->itt);
|
|
return 0;
|
|
}
|
|
|
|
rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
|
|
BUG_ON(!rc);
|
|
|
|
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_ctask->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(ctask->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(ctask->sc)->length);
|
|
__kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
|
|
sizeof(void*));
|
|
return ISCSI_ERR_DATALEN;
|
|
}
|
|
|
|
r2t->ttt = rhdr->ttt; /* no flip */
|
|
r2t->solicit_datasn = 0;
|
|
|
|
iscsi_solicit_data_init(conn, ctask, r2t);
|
|
|
|
tcp_ctask->exp_datasn = r2tsn + 1;
|
|
__kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
|
|
conn->r2t_pdus_cnt++;
|
|
|
|
iscsi_requeue_ctask(ctask);
|
|
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_session *session = conn->session;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_cmd_task *ctask;
|
|
uint32_t itt;
|
|
|
|
/* 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:
|
|
ctask = session->cmds[itt];
|
|
spin_lock(&conn->session->lock);
|
|
rc = iscsi_data_rsp(conn, ctask);
|
|
spin_unlock(&conn->session->lock);
|
|
if (rc)
|
|
return rc;
|
|
if (tcp_conn->in.datalen) {
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct hash_desc *rx_hash = NULL;
|
|
struct scsi_data_buffer *sdb = scsi_in(ctask->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)
|
|
rx_hash = &tcp_conn->rx_hash;
|
|
|
|
debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, "
|
|
"datalen=%d)\n", tcp_conn,
|
|
tcp_ctask->data_offset,
|
|
tcp_conn->in.datalen);
|
|
return iscsi_segment_seek_sg(&tcp_conn->in.segment,
|
|
sdb->table.sgl,
|
|
sdb->table.nents,
|
|
tcp_ctask->data_offset,
|
|
tcp_conn->in.datalen,
|
|
iscsi_tcp_process_data_in,
|
|
rx_hash);
|
|
}
|
|
/* fall through */
|
|
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:
|
|
ctask = session->cmds[itt];
|
|
if (ahslen)
|
|
rc = ISCSI_ERR_AHSLEN;
|
|
else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) {
|
|
spin_lock(&session->lock);
|
|
rc = iscsi_r2t_rsp(conn, ctask);
|
|
spin_unlock(&session->lock);
|
|
} else
|
|
rc = ISCSI_ERR_PROTO;
|
|
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) {
|
|
if (segment->digest_len == 0) {
|
|
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 - TCP receive in sendfile fashion
|
|
* @rd_desc: read descriptor
|
|
* @skb: socket buffer
|
|
* @offset: offset in skb
|
|
* @len: skb->len - offset
|
|
**/
|
|
static int
|
|
iscsi_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;
|
|
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);
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
break;
|
|
}
|
|
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) {
|
|
debug_tcp("segment done\n");
|
|
rc = segment->done(tcp_conn, segment);
|
|
if (rc != 0) {
|
|
skb_abort_seq_read(&seq);
|
|
goto error;
|
|
}
|
|
|
|
/* The done() functions sets up the
|
|
* next segment. */
|
|
}
|
|
}
|
|
skb_abort_seq_read(&seq);
|
|
conn->rxdata_octets += consumed;
|
|
return consumed;
|
|
|
|
error:
|
|
debug_tcp("Error receiving PDU, errno=%d\n", rc);
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_data_ready(struct sock *sk, int flag)
|
|
{
|
|
struct iscsi_conn *conn = sk->sk_user_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
read_descriptor_t rd_desc;
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
|
|
/*
|
|
* 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_tcp_recv);
|
|
|
|
read_unlock(&sk->sk_callback_lock);
|
|
|
|
/* If we had to (atomically) map a highmem page,
|
|
* unmap it now. */
|
|
iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_state_change(struct sock *sk)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_session *session;
|
|
void (*old_state_change)(struct sock *);
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
|
|
conn = (struct iscsi_conn*)sk->sk_user_data;
|
|
session = conn->session;
|
|
|
|
if ((sk->sk_state == TCP_CLOSE_WAIT ||
|
|
sk->sk_state == TCP_CLOSE) &&
|
|
!atomic_read(&sk->sk_rmem_alloc)) {
|
|
debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
}
|
|
|
|
tcp_conn = conn->dd_data;
|
|
old_state_change = tcp_conn->old_state_change;
|
|
|
|
read_unlock(&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_write_space(struct sock *sk)
|
|
{
|
|
struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
|
|
tcp_conn->old_write_space(sk);
|
|
debug_tcp("iscsi_write_space: cid %d\n", conn->id);
|
|
scsi_queue_work(conn->session->host, &conn->xmitwork);
|
|
}
|
|
|
|
static void
|
|
iscsi_conn_set_callbacks(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct sock *sk = tcp_conn->sock->sk;
|
|
|
|
/* assign new callbacks */
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sk->sk_user_data = conn;
|
|
tcp_conn->old_data_ready = sk->sk_data_ready;
|
|
tcp_conn->old_state_change = sk->sk_state_change;
|
|
tcp_conn->old_write_space = sk->sk_write_space;
|
|
sk->sk_data_ready = iscsi_tcp_data_ready;
|
|
sk->sk_state_change = iscsi_tcp_state_change;
|
|
sk->sk_write_space = iscsi_write_space;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void
|
|
iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
|
|
{
|
|
struct sock *sk = tcp_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_conn->old_data_ready;
|
|
sk->sk_state_change = tcp_conn->old_state_change;
|
|
sk->sk_write_space = tcp_conn->old_write_space;
|
|
sk->sk_no_check = 0;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* iscsi_xmit - TCP transmit
|
|
**/
|
|
static int
|
|
iscsi_xmit(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_segment *segment = &tcp_conn->out.segment;
|
|
unsigned int consumed = 0;
|
|
int rc = 0;
|
|
|
|
while (1) {
|
|
rc = iscsi_tcp_xmit_segment(tcp_conn, segment);
|
|
if (rc < 0)
|
|
goto error;
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
debug_tcp("xmit %d bytes\n", consumed);
|
|
|
|
conn->txdata_octets += consumed;
|
|
return consumed;
|
|
|
|
error:
|
|
/* Transmit error. We could initiate error recovery
|
|
* here. */
|
|
debug_tcp("Error sending PDU, errno=%d\n", rc);
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
|
|
*/
|
|
static inline int
|
|
iscsi_tcp_xmit_qlen(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_segment *segment = &tcp_conn->out.segment;
|
|
|
|
return segment->total_copied - segment->total_size;
|
|
}
|
|
|
|
static inline int
|
|
iscsi_tcp_flush(struct iscsi_conn *conn)
|
|
{
|
|
int rc;
|
|
|
|
while (iscsi_tcp_xmit_qlen(conn)) {
|
|
rc = iscsi_xmit(conn);
|
|
if (rc == 0)
|
|
return -EAGAIN;
|
|
if (rc < 0)
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is called when we're done sending the header.
|
|
* Simply copy the data_segment to the send segment, and return.
|
|
*/
|
|
static int
|
|
iscsi_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_segment *segment)
|
|
{
|
|
tcp_conn->out.segment = tcp_conn->out.data_segment;
|
|
debug_tcp("Header done. Next segment size %u total_size %u\n",
|
|
tcp_conn->out.segment.size, tcp_conn->out.segment.total_size);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, size_t hdrlen)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
|
|
debug_tcp("%s(%p%s)\n", __FUNCTION__, tcp_conn,
|
|
conn->hdrdgst_en? ", digest enabled" : "");
|
|
|
|
/* Clear the data segment - needs to be filled in by the
|
|
* caller using iscsi_tcp_send_data_prep() */
|
|
memset(&tcp_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_ctask and mtask have
|
|
* sufficient room.
|
|
*/
|
|
if (conn->hdrdgst_en) {
|
|
iscsi_tcp_dgst_header(&tcp_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_conn->out.hdr = hdr;
|
|
|
|
iscsi_segment_init_linear(&tcp_conn->out.segment, hdr, hdrlen,
|
|
iscsi_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_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 hash_desc *tx_hash = NULL;
|
|
unsigned int hdr_spec_len;
|
|
|
|
debug_tcp("%s(%p, offset=%d, datalen=%d%s)\n", __FUNCTION__,
|
|
tcp_conn, offset, len,
|
|
conn->datadgst_en? ", digest enabled" : "");
|
|
|
|
/* Make sure the datalen matches what the caller
|
|
said he would send. */
|
|
hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength);
|
|
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
|
|
|
|
if (conn->datadgst_en)
|
|
tx_hash = &tcp_conn->tx_hash;
|
|
|
|
return iscsi_segment_seek_sg(&tcp_conn->out.data_segment,
|
|
sg, count, offset, len,
|
|
NULL, tx_hash);
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_send_linear_data_prepare(struct iscsi_conn *conn, void *data,
|
|
size_t len)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct hash_desc *tx_hash = NULL;
|
|
unsigned int hdr_spec_len;
|
|
|
|
debug_tcp("%s(%p, datalen=%d%s)\n", __FUNCTION__, tcp_conn, len,
|
|
conn->datadgst_en? ", digest enabled" : "");
|
|
|
|
/* Make sure the datalen matches what the caller
|
|
said he would send. */
|
|
hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength);
|
|
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
|
|
|
|
if (conn->datadgst_en)
|
|
tx_hash = &tcp_conn->tx_hash;
|
|
|
|
iscsi_segment_init_linear(&tcp_conn->out.data_segment,
|
|
data, len, NULL, tx_hash);
|
|
}
|
|
|
|
/**
|
|
* iscsi_solicit_data_cont - initialize next Data-Out
|
|
* @conn: iscsi connection
|
|
* @ctask: scsi command task
|
|
* @r2t: R2T info
|
|
* @left: bytes left to transfer
|
|
*
|
|
* Notes:
|
|
* Initialize next Data-Out within this R2T sequence and continue
|
|
* to process next Scatter-Gather element(if any) of this SCSI command.
|
|
*
|
|
* Called under connection lock.
|
|
**/
|
|
static int
|
|
iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
struct iscsi_r2t_info *r2t)
|
|
{
|
|
struct iscsi_data *hdr;
|
|
int new_offset, left;
|
|
|
|
BUG_ON(r2t->data_length - r2t->sent < 0);
|
|
left = r2t->data_length - r2t->sent;
|
|
if (left == 0)
|
|
return 0;
|
|
|
|
hdr = &r2t->dtask.hdr;
|
|
memset(hdr, 0, sizeof(struct iscsi_data));
|
|
hdr->ttt = r2t->ttt;
|
|
hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
|
|
r2t->solicit_datasn++;
|
|
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
|
|
memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
|
|
hdr->itt = ctask->hdr->itt;
|
|
hdr->exp_statsn = r2t->exp_statsn;
|
|
new_offset = r2t->data_offset + r2t->sent;
|
|
hdr->offset = cpu_to_be32(new_offset);
|
|
if (left > conn->max_xmit_dlength) {
|
|
hton24(hdr->dlength, conn->max_xmit_dlength);
|
|
r2t->data_count = conn->max_xmit_dlength;
|
|
} else {
|
|
hton24(hdr->dlength, left);
|
|
r2t->data_count = left;
|
|
hdr->flags = ISCSI_FLAG_CMD_FINAL;
|
|
}
|
|
|
|
conn->dataout_pdus_cnt++;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_ctask - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
|
|
* @conn: iscsi connection
|
|
* @ctask: scsi command task
|
|
* @sc: scsi command
|
|
**/
|
|
static int
|
|
iscsi_tcp_ctask_init(struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
int err;
|
|
|
|
BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
|
|
tcp_ctask->sent = 0;
|
|
tcp_ctask->exp_datasn = 0;
|
|
|
|
/* Prepare PDU, optionally w/ immediate data */
|
|
debug_scsi("ctask deq [cid %d itt 0x%x imm %d unsol %d]\n",
|
|
conn->id, ctask->itt, ctask->imm_count,
|
|
ctask->unsol_count);
|
|
iscsi_tcp_send_hdr_prep(conn, ctask->hdr, ctask->hdr_len);
|
|
|
|
if (!ctask->imm_count)
|
|
return 0;
|
|
|
|
/* If we have immediate data, attach a payload */
|
|
err = iscsi_tcp_send_data_prep(conn, scsi_out(sc)->table.sgl,
|
|
scsi_out(sc)->table.nents,
|
|
0, ctask->imm_count);
|
|
if (err)
|
|
return err;
|
|
tcp_ctask->sent += ctask->imm_count;
|
|
ctask->imm_count = 0;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_mtask_xmit - xmit management(immediate) task
|
|
* @conn: iscsi connection
|
|
* @mtask: task management task
|
|
*
|
|
* Notes:
|
|
* The function can return -EAGAIN in which case caller must
|
|
* call it again later, or recover. '0' return code means successful
|
|
* xmit.
|
|
**/
|
|
static int
|
|
iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
|
|
{
|
|
int rc;
|
|
|
|
/* Flush any pending data first. */
|
|
rc = iscsi_tcp_flush(conn);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (mtask->hdr->itt == RESERVED_ITT) {
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
spin_lock_bh(&session->lock);
|
|
iscsi_free_mgmt_task(conn, mtask);
|
|
spin_unlock_bh(&session->lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* iscsi_tcp_ctask_xmit - xmit normal PDU task
|
|
* @conn: iscsi connection
|
|
* @ctask: 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.
|
|
*/
|
|
static int
|
|
iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
struct scsi_data_buffer *sdb = scsi_out(sc);
|
|
int rc = 0;
|
|
|
|
flush:
|
|
/* Flush any pending data first. */
|
|
rc = iscsi_tcp_flush(conn);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* Are we done already? */
|
|
if (sc->sc_data_direction != DMA_TO_DEVICE)
|
|
return 0;
|
|
|
|
if (ctask->unsol_count != 0) {
|
|
struct iscsi_data *hdr = &tcp_ctask->unsol_dtask.hdr;
|
|
|
|
/* Prepare a header for the unsolicited PDU.
|
|
* The amount of data we want to send will be
|
|
* in ctask->data_count.
|
|
* FIXME: return the data count instead.
|
|
*/
|
|
iscsi_prep_unsolicit_data_pdu(ctask, hdr);
|
|
|
|
debug_tcp("unsol dout [itt 0x%x doff %d dlen %d]\n",
|
|
ctask->itt, tcp_ctask->sent, ctask->data_count);
|
|
|
|
iscsi_tcp_send_hdr_prep(conn, hdr, sizeof(*hdr));
|
|
rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl,
|
|
sdb->table.nents, tcp_ctask->sent,
|
|
ctask->data_count);
|
|
if (rc)
|
|
goto fail;
|
|
tcp_ctask->sent += ctask->data_count;
|
|
ctask->unsol_count -= ctask->data_count;
|
|
goto flush;
|
|
} else {
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_r2t_info *r2t;
|
|
|
|
/* All unsolicited PDUs sent. Check for solicited PDUs.
|
|
*/
|
|
spin_lock_bh(&session->lock);
|
|
r2t = tcp_ctask->r2t;
|
|
if (r2t != NULL) {
|
|
/* Continue with this R2T? */
|
|
if (!iscsi_solicit_data_cont(conn, ctask, r2t)) {
|
|
debug_scsi(" done with r2t %p\n", r2t);
|
|
|
|
__kfifo_put(tcp_ctask->r2tpool.queue,
|
|
(void*)&r2t, sizeof(void*));
|
|
tcp_ctask->r2t = r2t = NULL;
|
|
}
|
|
}
|
|
|
|
if (r2t == NULL) {
|
|
__kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
|
|
sizeof(void*));
|
|
r2t = tcp_ctask->r2t;
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
/* Waiting for more R2Ts to arrive. */
|
|
if (r2t == NULL) {
|
|
debug_tcp("no R2Ts yet\n");
|
|
return 0;
|
|
}
|
|
|
|
debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",
|
|
r2t, r2t->solicit_datasn - 1, ctask->itt,
|
|
r2t->data_offset + r2t->sent, r2t->data_count);
|
|
|
|
iscsi_tcp_send_hdr_prep(conn, &r2t->dtask.hdr,
|
|
sizeof(struct iscsi_hdr));
|
|
|
|
rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl,
|
|
sdb->table.nents,
|
|
r2t->data_offset + r2t->sent,
|
|
r2t->data_count);
|
|
if (rc)
|
|
goto fail;
|
|
tcp_ctask->sent += r2t->data_count;
|
|
r2t->sent += r2t->data_count;
|
|
goto flush;
|
|
}
|
|
return 0;
|
|
fail:
|
|
iscsi_conn_failure(conn, rc);
|
|
return -EIO;
|
|
}
|
|
|
|
static struct iscsi_cls_conn *
|
|
iscsi_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;
|
|
|
|
cls_conn = iscsi_conn_setup(cls_session, 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 = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
|
|
if (!tcp_conn)
|
|
goto tcp_conn_alloc_fail;
|
|
|
|
conn->dd_data = tcp_conn;
|
|
tcp_conn->iscsi_conn = conn;
|
|
|
|
tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
|
|
CRYPTO_ALG_ASYNC);
|
|
tcp_conn->tx_hash.flags = 0;
|
|
if (IS_ERR(tcp_conn->tx_hash.tfm))
|
|
goto free_tcp_conn;
|
|
|
|
tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
|
|
CRYPTO_ALG_ASYNC);
|
|
tcp_conn->rx_hash.flags = 0;
|
|
if (IS_ERR(tcp_conn->rx_hash.tfm))
|
|
goto free_tx_tfm;
|
|
|
|
return cls_conn;
|
|
|
|
free_tx_tfm:
|
|
crypto_free_hash(tcp_conn->tx_hash.tfm);
|
|
free_tcp_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");
|
|
kfree(tcp_conn);
|
|
tcp_conn_alloc_fail:
|
|
iscsi_conn_teardown(cls_conn);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_release_conn(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct socket *sock = tcp_conn->sock;
|
|
|
|
if (!sock)
|
|
return;
|
|
|
|
sock_hold(sock->sk);
|
|
iscsi_conn_restore_callbacks(tcp_conn);
|
|
sock_put(sock->sk);
|
|
|
|
spin_lock_bh(&session->lock);
|
|
tcp_conn->sock = NULL;
|
|
conn->recv_lock = NULL;
|
|
spin_unlock_bh(&session->lock);
|
|
sockfd_put(sock);
|
|
}
|
|
|
|
static void
|
|
iscsi_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;
|
|
|
|
iscsi_tcp_release_conn(conn);
|
|
iscsi_conn_teardown(cls_conn);
|
|
|
|
if (tcp_conn->tx_hash.tfm)
|
|
crypto_free_hash(tcp_conn->tx_hash.tfm);
|
|
if (tcp_conn->rx_hash.tfm)
|
|
crypto_free_hash(tcp_conn->rx_hash.tfm);
|
|
|
|
kfree(tcp_conn);
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
|
|
iscsi_conn_stop(cls_conn, flag);
|
|
iscsi_tcp_release_conn(conn);
|
|
}
|
|
|
|
static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
|
|
char *buf, int *port,
|
|
int (*getname)(struct socket *, struct sockaddr *,
|
|
int *addrlen))
|
|
{
|
|
struct sockaddr_storage *addr;
|
|
struct sockaddr_in6 *sin6;
|
|
struct sockaddr_in *sin;
|
|
int rc = 0, len;
|
|
|
|
addr = kmalloc(sizeof(*addr), GFP_KERNEL);
|
|
if (!addr)
|
|
return -ENOMEM;
|
|
|
|
if (getname(sock, (struct sockaddr *) addr, &len)) {
|
|
rc = -ENODEV;
|
|
goto free_addr;
|
|
}
|
|
|
|
switch (addr->ss_family) {
|
|
case AF_INET:
|
|
sin = (struct sockaddr_in *)addr;
|
|
spin_lock_bh(&conn->session->lock);
|
|
sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
|
|
*port = be16_to_cpu(sin->sin_port);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
break;
|
|
case AF_INET6:
|
|
sin6 = (struct sockaddr_in6 *)addr;
|
|
spin_lock_bh(&conn->session->lock);
|
|
sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr));
|
|
*port = be16_to_cpu(sin6->sin6_port);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
break;
|
|
}
|
|
free_addr:
|
|
kfree(addr);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
|
|
struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
|
|
int is_leading)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = 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;
|
|
}
|
|
/*
|
|
* copy these values now because if we drop the session
|
|
* userspace may still want to query the values since we will
|
|
* be using them for the reconnect
|
|
*/
|
|
err = iscsi_tcp_get_addr(conn, sock, conn->portal_address,
|
|
&conn->portal_port, kernel_getpeername);
|
|
if (err)
|
|
goto free_socket;
|
|
|
|
err = iscsi_tcp_get_addr(conn, sock, conn->local_address,
|
|
&conn->local_port, kernel_getsockname);
|
|
if (err)
|
|
goto free_socket;
|
|
|
|
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
|
|
if (err)
|
|
goto free_socket;
|
|
|
|
/* bind iSCSI connection and socket */
|
|
tcp_conn->sock = sock;
|
|
|
|
/* setup Socket parameters */
|
|
sk = sock->sk;
|
|
sk->sk_reuse = 1;
|
|
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
|
|
sk->sk_allocation = GFP_ATOMIC;
|
|
|
|
/* FIXME: disable Nagle's algorithm */
|
|
|
|
/*
|
|
* Intercept TCP callbacks for sendfile like receive
|
|
* processing.
|
|
*/
|
|
conn->recv_lock = &sk->sk_callback_lock;
|
|
iscsi_conn_set_callbacks(conn);
|
|
tcp_conn->sendpage = tcp_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;
|
|
}
|
|
|
|
/* called with host lock */
|
|
static void
|
|
iscsi_tcp_mtask_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
|
|
{
|
|
debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
|
|
|
|
/* Prepare PDU, optionally w/ immediate data */
|
|
iscsi_tcp_send_hdr_prep(conn, mtask->hdr, sizeof(*mtask->hdr));
|
|
|
|
/* If we have immediate data, attach a payload */
|
|
if (mtask->data_count)
|
|
iscsi_tcp_send_linear_data_prepare(conn, mtask->data,
|
|
mtask->data_count);
|
|
}
|
|
|
|
static int
|
|
iscsi_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_cmd_task *ctask = session->cmds[cmd_i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
/*
|
|
* pre-allocated x4 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_ctask->r2tpool, session->max_r2t * 4, NULL,
|
|
sizeof(struct iscsi_r2t_info))) {
|
|
goto r2t_alloc_fail;
|
|
}
|
|
|
|
/* R2T xmit queue */
|
|
tcp_ctask->r2tqueue = kfifo_alloc(
|
|
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
|
|
if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
|
|
iscsi_pool_free(&tcp_ctask->r2tpool);
|
|
goto r2t_alloc_fail;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
r2t_alloc_fail:
|
|
for (i = 0; i < cmd_i; i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
kfifo_free(tcp_ctask->r2tqueue);
|
|
iscsi_pool_free(&tcp_ctask->r2tpool);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void
|
|
iscsi_r2tpool_free(struct iscsi_session *session)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < session->cmds_max; i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
kfifo_free(tcp_ctask->r2tqueue);
|
|
iscsi_pool_free(&tcp_ctask->r2tpool);
|
|
}
|
|
}
|
|
|
|
static int
|
|
iscsi_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_session *session = conn->session;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
int value;
|
|
|
|
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_conn->sendpage = conn->datadgst_en ?
|
|
sock_no_sendpage : tcp_conn->sock->ops->sendpage;
|
|
break;
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
sscanf(buf, "%d", &value);
|
|
if (value <= 0 || !is_power_of_2(value))
|
|
return -EINVAL;
|
|
if (session->max_r2t == value)
|
|
break;
|
|
iscsi_r2tpool_free(session);
|
|
iscsi_set_param(cls_conn, param, buf, buflen);
|
|
if (iscsi_r2tpool_alloc(session))
|
|
return -ENOMEM;
|
|
break;
|
|
default:
|
|
return iscsi_set_param(cls_conn, param, buf, buflen);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
int len;
|
|
|
|
switch(param) {
|
|
case ISCSI_PARAM_CONN_PORT:
|
|
spin_lock_bh(&conn->session->lock);
|
|
len = sprintf(buf, "%hu\n", conn->portal_port);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
break;
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
spin_lock_bh(&conn->session->lock);
|
|
len = sprintf(buf, "%s\n", conn->portal_address);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
break;
|
|
default:
|
|
return iscsi_conn_get_param(cls_conn, param, buf);
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int
|
|
iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
|
|
char *buf)
|
|
{
|
|
struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
|
|
int len;
|
|
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_IPADDRESS:
|
|
spin_lock_bh(&session->lock);
|
|
if (!session->leadconn)
|
|
len = -ENODEV;
|
|
else
|
|
len = sprintf(buf, "%s\n",
|
|
session->leadconn->local_address);
|
|
spin_unlock_bh(&session->lock);
|
|
break;
|
|
default:
|
|
return iscsi_host_get_param(shost, param, buf);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static void
|
|
iscsi_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;
|
|
|
|
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;
|
|
stats->custom_length = 3;
|
|
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
|
|
stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
|
|
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
|
|
stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
|
|
strcpy(stats->custom[2].desc, "eh_abort_cnt");
|
|
stats->custom[2].value = conn->eh_abort_cnt;
|
|
}
|
|
|
|
static struct iscsi_cls_session *
|
|
iscsi_tcp_session_create(struct iscsi_transport *iscsit,
|
|
struct scsi_transport_template *scsit,
|
|
struct Scsi_Host *shost, uint16_t cmds_max,
|
|
uint16_t qdepth, uint32_t initial_cmdsn,
|
|
uint32_t *hostno)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
uint32_t hn;
|
|
int cmd_i;
|
|
|
|
cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth,
|
|
sizeof(struct iscsi_tcp_cmd_task),
|
|
sizeof(struct iscsi_tcp_mgmt_task),
|
|
initial_cmdsn, &hn);
|
|
if (!cls_session)
|
|
return NULL;
|
|
*hostno = hn;
|
|
|
|
session = class_to_transport_session(cls_session);
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
ctask->hdr = &tcp_ctask->hdr.cmd_hdr;
|
|
ctask->hdr_max = sizeof(tcp_ctask->hdr) - ISCSI_DIGEST_SIZE;
|
|
}
|
|
|
|
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
|
|
struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
|
|
struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
|
|
|
|
mtask->hdr = (struct iscsi_hdr *) &tcp_mtask->hdr;
|
|
}
|
|
|
|
if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
|
|
goto r2tpool_alloc_fail;
|
|
|
|
return cls_session;
|
|
|
|
r2tpool_alloc_fail:
|
|
iscsi_session_teardown(cls_session);
|
|
return NULL;
|
|
}
|
|
|
|
static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
|
|
{
|
|
iscsi_r2tpool_free(class_to_transport_session(cls_session));
|
|
iscsi_session_teardown(cls_session);
|
|
}
|
|
|
|
static int iscsi_tcp_slave_configure(struct scsi_device *sdev)
|
|
{
|
|
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_sht = {
|
|
.module = THIS_MODULE,
|
|
.name = "iSCSI Initiator over TCP/IP",
|
|
.queuecommand = iscsi_queuecommand,
|
|
.change_queue_depth = iscsi_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_abort_handler = iscsi_eh_abort,
|
|
.eh_device_reset_handler= iscsi_eh_device_reset,
|
|
.eh_host_reset_handler = iscsi_eh_host_reset,
|
|
.use_clustering = DISABLE_CLUSTERING,
|
|
.slave_configure = iscsi_tcp_slave_configure,
|
|
.proc_name = "iscsi_tcp",
|
|
.this_id = -1,
|
|
};
|
|
|
|
static struct iscsi_transport iscsi_tcp_transport = {
|
|
.owner = THIS_MODULE,
|
|
.name = "tcp",
|
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
|
|
| CAP_DATADGST,
|
|
.param_mask = ISCSI_MAX_RECV_DLENGTH |
|
|
ISCSI_MAX_XMIT_DLENGTH |
|
|
ISCSI_HDRDGST_EN |
|
|
ISCSI_DATADGST_EN |
|
|
ISCSI_INITIAL_R2T_EN |
|
|
ISCSI_MAX_R2T |
|
|
ISCSI_IMM_DATA_EN |
|
|
ISCSI_FIRST_BURST |
|
|
ISCSI_MAX_BURST |
|
|
ISCSI_PDU_INORDER_EN |
|
|
ISCSI_DATASEQ_INORDER_EN |
|
|
ISCSI_ERL |
|
|
ISCSI_CONN_PORT |
|
|
ISCSI_CONN_ADDRESS |
|
|
ISCSI_EXP_STATSN |
|
|
ISCSI_PERSISTENT_PORT |
|
|
ISCSI_PERSISTENT_ADDRESS |
|
|
ISCSI_TARGET_NAME | ISCSI_TPGT |
|
|
ISCSI_USERNAME | ISCSI_PASSWORD |
|
|
ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
|
|
ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
|
|
ISCSI_LU_RESET_TMO |
|
|
ISCSI_PING_TMO | ISCSI_RECV_TMO,
|
|
.host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
|
|
ISCSI_HOST_INITIATOR_NAME |
|
|
ISCSI_HOST_NETDEV_NAME,
|
|
.host_template = &iscsi_sht,
|
|
.conndata_size = sizeof(struct iscsi_conn),
|
|
/* session management */
|
|
.create_session = iscsi_tcp_session_create,
|
|
.destroy_session = iscsi_tcp_session_destroy,
|
|
/* connection management */
|
|
.create_conn = iscsi_tcp_conn_create,
|
|
.bind_conn = iscsi_tcp_conn_bind,
|
|
.destroy_conn = iscsi_tcp_conn_destroy,
|
|
.set_param = iscsi_conn_set_param,
|
|
.get_conn_param = iscsi_tcp_conn_get_param,
|
|
.get_session_param = iscsi_session_get_param,
|
|
.start_conn = iscsi_conn_start,
|
|
.stop_conn = iscsi_tcp_conn_stop,
|
|
/* iscsi host params */
|
|
.get_host_param = iscsi_tcp_host_get_param,
|
|
.set_host_param = iscsi_host_set_param,
|
|
/* IO */
|
|
.send_pdu = iscsi_conn_send_pdu,
|
|
.get_stats = iscsi_conn_get_stats,
|
|
.init_cmd_task = iscsi_tcp_ctask_init,
|
|
.init_mgmt_task = iscsi_tcp_mtask_init,
|
|
.xmit_cmd_task = iscsi_tcp_ctask_xmit,
|
|
.xmit_mgmt_task = iscsi_tcp_mtask_xmit,
|
|
.cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
|
|
/* recovery */
|
|
.session_recovery_timedout = iscsi_session_recovery_timedout,
|
|
};
|
|
|
|
static int __init
|
|
iscsi_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_tcp_transport.max_lun = iscsi_max_lun;
|
|
|
|
if (!iscsi_register_transport(&iscsi_tcp_transport))
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
iscsi_tcp_exit(void)
|
|
{
|
|
iscsi_unregister_transport(&iscsi_tcp_transport);
|
|
}
|
|
|
|
module_init(iscsi_tcp_init);
|
|
module_exit(iscsi_tcp_exit);
|