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5d6ac29b9e
This patch replaces uses of the long obsolete hash interface with ahash. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
1220 lines
33 KiB
C
1220 lines
33 KiB
C
/*
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* iSCSI over TCP/IP Data-Path lib
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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 <crypto/hash.h>
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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/slab.h>
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#include <linux/file.h>
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#include <linux/blkdev.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 <linux/module.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("Mike Christie <michaelc@cs.wisc.edu>, "
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"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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static int iscsi_dbg_libtcp;
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module_param_named(debug_libiscsi_tcp, iscsi_dbg_libtcp, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp "
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"module. Set to 1 to turn on, and zero to turn off. Default "
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"is off.");
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#define ISCSI_DBG_TCP(_conn, dbg_fmt, arg...) \
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do { \
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if (iscsi_dbg_libtcp) \
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iscsi_conn_printk(KERN_INFO, _conn, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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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 void 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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if (recv) {
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segment->atomic_mapped = true;
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segment->sg_mapped = kmap_atomic(sg_page(sg));
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} else {
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segment->atomic_mapped = false;
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/* the xmit path can sleep with the page mapped so use kmap */
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segment->sg_mapped = kmap(sg_page(sg));
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}
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segment->data = segment->sg_mapped + sg->offset + segment->sg_offset;
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}
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void iscsi_tcp_segment_unmap(struct iscsi_segment *segment)
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{
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if (segment->sg_mapped) {
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if (segment->atomic_mapped)
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kunmap_atomic(segment->sg_mapped);
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else
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kunmap(sg_page(segment->sg));
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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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EXPORT_SYMBOL_GPL(iscsi_tcp_segment_unmap);
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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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* @tcp_conn: iscsi tcp connection
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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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int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn,
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struct iscsi_segment *segment, int recv,
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unsigned copied)
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{
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struct scatterlist sg;
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unsigned int pad;
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ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copied %u %u size %u %s\n",
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segment->copied, copied, segment->size,
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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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ahash_request_set_crypt(segment->hash, &sg, NULL, copied);
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crypto_ahash_update(segment->hash);
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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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ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "total copied %u total size %u\n",
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segment->total_copied, 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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if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) {
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pad = iscsi_padding(segment->total_copied);
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if (pad != 0) {
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ISCSI_DBG_TCP(tcp_conn->iscsi_conn,
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"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 = segment->padbuf;
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return 0;
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}
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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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ahash_request_set_crypt(segment->hash, NULL,
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segment->digest, 0);
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crypto_ahash_final(segment->hash);
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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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EXPORT_SYMBOL_GPL(iscsi_tcp_segment_done);
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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(tcp_conn, segment, 1, copy)) {
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if (copied == len) {
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ISCSI_DBG_TCP(tcp_conn->iscsi_conn,
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"copied %d bytes\n", 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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ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "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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inline void
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iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr,
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size_t hdrlen, 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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ahash_request_set_crypt(hash, &sg, digest, hdrlen);
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crypto_ahash_digest(hash);
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}
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EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header);
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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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ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "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 ahash_request *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_ahash_init(hash);
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}
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}
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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 ahash_request *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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EXPORT_SYMBOL_GPL(iscsi_segment_init_linear);
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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,
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struct ahash_request *hash)
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{
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struct scatterlist *sg;
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unsigned int i;
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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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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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EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg);
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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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void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)
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{
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ISCSI_DBG_TCP(tcp_conn->iscsi_conn,
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"(%s)\n", tcp_conn->iscsi_conn->hdrdgst_en ?
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"digest enabled" : "digest disabled");
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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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EXPORT_SYMBOL_GPL(iscsi_tcp_hdr_recv_prep);
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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 ahash_request *rx_hash = NULL;
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if (conn->datadgst_en &&
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!(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
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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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* iscsi_tcp_cleanup_task - free tcp_task resources
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* @task: iscsi task
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*
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* must be called with session back_lock
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*/
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void iscsi_tcp_cleanup_task(struct iscsi_task *task)
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{
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struct iscsi_tcp_task *tcp_task = task->dd_data;
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struct iscsi_r2t_info *r2t;
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/* nothing to do for mgmt */
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if (!task->sc)
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return;
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spin_lock_bh(&tcp_task->queue2pool);
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/* flush task's r2t queues */
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while (kfifo_out(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) {
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kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t,
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sizeof(void*));
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ISCSI_DBG_TCP(task->conn, "pending r2t dropped\n");
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}
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r2t = tcp_task->r2t;
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if (r2t != NULL) {
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kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t,
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sizeof(void*));
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tcp_task->r2t = NULL;
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}
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spin_unlock_bh(&tcp_task->queue2pool);
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}
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EXPORT_SYMBOL_GPL(iscsi_tcp_cleanup_task);
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|
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/**
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* iscsi_tcp_data_in - SCSI Data-In Response processing
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* @conn: iscsi connection
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* @task: scsi command task
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*/
|
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static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task)
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{
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
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struct iscsi_tcp_task *tcp_task = task->dd_data;
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struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
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int datasn = be32_to_cpu(rhdr->datasn);
|
|
unsigned total_in_length = scsi_in(task->sc)->length;
|
|
|
|
/*
|
|
* lib iscsi will update this in the completion handling if there
|
|
* is status.
|
|
*/
|
|
if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
|
|
iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr);
|
|
|
|
if (tcp_conn->in.datalen == 0)
|
|
return 0;
|
|
|
|
if (tcp_task->exp_datasn != datasn) {
|
|
ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->datasn(%d)"
|
|
"\n", 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) {
|
|
ISCSI_DBG_TCP(conn, "data_offset(%d) + data_len(%d) > "
|
|
"total_length_in(%d)\n", 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);
|
|
u32 data_length;
|
|
u32 data_offset;
|
|
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){
|
|
ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
|
|
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;
|
|
}
|
|
|
|
data_length = be32_to_cpu(rhdr->data_length);
|
|
if (data_length == 0) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"invalid R2T with zero data len\n");
|
|
return ISCSI_ERR_DATALEN;
|
|
}
|
|
|
|
if (data_length > session->max_burst)
|
|
ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max "
|
|
"burst %u. Attempting to execute request.\n",
|
|
data_length, session->max_burst);
|
|
|
|
data_offset = be32_to_cpu(rhdr->data_offset);
|
|
if (data_offset + 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", data_length,
|
|
data_offset, scsi_out(task->sc)->length);
|
|
return ISCSI_ERR_DATALEN;
|
|
}
|
|
|
|
spin_lock(&tcp_task->pool2queue);
|
|
rc = kfifo_out(&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 leaked.\n");
|
|
spin_unlock(&tcp_task->pool2queue);
|
|
return ISCSI_ERR_PROTO;
|
|
}
|
|
|
|
r2t->exp_statsn = rhdr->statsn;
|
|
r2t->data_length = data_length;
|
|
r2t->data_offset = data_offset;
|
|
|
|
r2t->ttt = rhdr->ttt; /* no flip */
|
|
r2t->datasn = 0;
|
|
r2t->sent = 0;
|
|
|
|
tcp_task->exp_datasn = r2tsn + 1;
|
|
kfifo_in(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*));
|
|
conn->r2t_pdus_cnt++;
|
|
spin_unlock(&tcp_task->pool2queue);
|
|
|
|
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;
|
|
|
|
ISCSI_DBG_TCP(conn, "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->back_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->back_lock);
|
|
break;
|
|
}
|
|
|
|
if (tcp_conn->in.datalen) {
|
|
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
|
struct ahash_request *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;
|
|
|
|
ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( "
|
|
"offset=%d, datalen=%d)\n",
|
|
tcp_task->data_offset,
|
|
tcp_conn->in.datalen);
|
|
task->last_xfer = jiffies;
|
|
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->back_lock);
|
|
return rc;
|
|
}
|
|
rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
|
|
spin_unlock(&conn->session->back_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->back_lock);
|
|
task = iscsi_itt_to_ctask(conn, hdr->itt);
|
|
spin_unlock(&conn->session->back_lock);
|
|
if (!task)
|
|
rc = ISCSI_ERR_BAD_ITT;
|
|
else if (ahslen)
|
|
rc = ISCSI_ERR_AHSLEN;
|
|
else if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
|
|
task->last_xfer = jiffies;
|
|
spin_lock(&conn->session->frwd_lock);
|
|
rc = iscsi_tcp_r2t_rsp(conn, task);
|
|
spin_unlock(&conn->session->frwd_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 &&
|
|
!(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;
|
|
|
|
ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset);
|
|
/*
|
|
* Update for each skb instead of pdu, because over slow networks a
|
|
* data_in's data could take a while to read in. We also want to
|
|
* account for r2ts.
|
|
*/
|
|
conn->last_recv = jiffies;
|
|
|
|
if (unlikely(conn->suspend_rx)) {
|
|
ISCSI_DBG_TCP(conn, "Rx suspended!\n");
|
|
*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) {
|
|
ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n",
|
|
consumed);
|
|
*status = ISCSI_TCP_SKB_DONE;
|
|
goto skb_done;
|
|
}
|
|
BUG_ON(segment->copied >= segment->size);
|
|
|
|
ISCSI_DBG_TCP(conn, "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;
|
|
ISCSI_DBG_TCP(conn, "segment done\n");
|
|
rc = segment->done(tcp_conn, segment);
|
|
if (rc != 0) {
|
|
*status = ISCSI_TCP_CONN_ERR;
|
|
ISCSI_DBG_TCP(conn, "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.
|
|
*/
|
|
ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", 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 */
|
|
ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n",
|
|
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_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(&tcp_task->queue2pool);
|
|
if (tcp_task->r2t) {
|
|
r2t = tcp_task->r2t;
|
|
/* Continue with this R2T? */
|
|
if (r2t->data_length <= r2t->sent) {
|
|
ISCSI_DBG_TCP(task->conn,
|
|
" done with r2t %p\n", r2t);
|
|
kfifo_in(&tcp_task->r2tpool.queue,
|
|
(void *)&tcp_task->r2t,
|
|
sizeof(void *));
|
|
tcp_task->r2t = r2t = NULL;
|
|
}
|
|
}
|
|
|
|
if (r2t == NULL) {
|
|
if (kfifo_out(&tcp_task->r2tqueue,
|
|
(void *)&tcp_task->r2t, sizeof(void *)) !=
|
|
sizeof(void *))
|
|
r2t = NULL;
|
|
else
|
|
r2t = tcp_task->r2t;
|
|
}
|
|
spin_unlock_bh(&tcp_task->queue2pool);
|
|
}
|
|
|
|
return r2t;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_task_xmit - xmit normal PDU task
|
|
* @task: iscsi command task
|
|
*
|
|
* We're expected to return 0 when everything was transmitted successfully,
|
|
* -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. */
|
|
ISCSI_DBG_TCP(conn, "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);
|
|
|
|
ISCSI_DBG_TCP(conn, "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) {
|
|
iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED);
|
|
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) + dd_data_size, 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 = conn->dd_data + sizeof(*tcp_conn);
|
|
return cls_conn;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup);
|
|
|
|
void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
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 */
|
|
if (kfifo_alloc(&tcp_task->r2tqueue,
|
|
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL)) {
|
|
iscsi_pool_free(&tcp_task->r2tpool);
|
|
goto r2t_alloc_fail;
|
|
}
|
|
spin_lock_init(&tcp_task->pool2queue);
|
|
spin_lock_init(&tcp_task->queue2pool);
|
|
}
|
|
|
|
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);
|
|
|
|
int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
unsigned short r2ts = 0;
|
|
|
|
sscanf(buf, "%hu", &r2ts);
|
|
if (session->max_r2t == r2ts)
|
|
return 0;
|
|
|
|
if (!r2ts || !is_power_of_2(r2ts))
|
|
return -EINVAL;
|
|
|
|
session->max_r2t = r2ts;
|
|
iscsi_tcp_r2tpool_free(session);
|
|
return iscsi_tcp_r2tpool_alloc(session);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_tcp_set_max_r2t);
|
|
|
|
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);
|