2005-08-05 02:30:08 +00:00
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/*
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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 Mike Christie
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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/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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2006-01-11 12:16:10 +00:00
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#include <linux/mutex.h>
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2005-08-05 02:30:08 +00:00
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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_eh.h>
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#include <scsi/scsi_request.h>
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#include <scsi/scsi_tcq.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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2005-11-30 05:13:01 +00:00
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MODULE_VERSION("0:4.445");
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2005-08-05 02:30:08 +00:00
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/* #define DEBUG_TCP */
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/* #define DEBUG_SCSI */
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#define DEBUG_ASSERT
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#ifdef DEBUG_TCP
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#define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
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#else
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#define debug_tcp(fmt...)
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#endif
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#ifdef DEBUG_SCSI
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#define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
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#else
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#define debug_scsi(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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#define INVALID_SN_DELTA 0xffff
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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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/* global data */
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static kmem_cache_t *taskcache;
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static inline void
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iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
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{
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sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
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ibuf->sent = 0;
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}
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static inline void
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iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
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{
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ibuf->sg.page = (void*)vbuf;
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ibuf->sg.offset = (unsigned int)-1;
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ibuf->sg.length = size;
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ibuf->sent = 0;
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}
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static inline void*
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iscsi_buf_iov_base(struct iscsi_buf *ibuf)
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{
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return (char*)ibuf->sg.page + ibuf->sent;
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}
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static inline void
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iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
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{
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/*
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* Fastpath: sg element fits into single page
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*/
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if (sg->length + sg->offset <= PAGE_SIZE && page_count(sg->page) >= 2) {
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ibuf->sg.page = sg->page;
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ibuf->sg.offset = sg->offset;
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ibuf->sg.length = sg->length;
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} else
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iscsi_buf_init_iov(ibuf, page_address(sg->page), sg->length);
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ibuf->sent = 0;
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}
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static inline int
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iscsi_buf_left(struct iscsi_buf *ibuf)
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{
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int rc;
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rc = ibuf->sg.length - ibuf->sent;
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BUG_ON(rc < 0);
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return rc;
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}
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static inline void
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2005-09-13 02:01:32 +00:00
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iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
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u8* crc)
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2005-08-05 02:30:08 +00:00
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{
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2005-09-13 02:01:32 +00:00
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crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
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buf->sg.length += sizeof(uint32_t);
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2005-08-05 02:30:08 +00:00
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}
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static void
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iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
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{
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struct iscsi_session *session = conn->session;
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unsigned long flags;
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spin_lock_irqsave(&session->lock, flags);
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if (session->conn_cnt == 1 || session->leadconn == conn)
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session->state = ISCSI_STATE_FAILED;
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spin_unlock_irqrestore(&session->lock, flags);
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set_bit(SUSPEND_BIT, &conn->suspend_tx);
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set_bit(SUSPEND_BIT, &conn->suspend_rx);
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iscsi_conn_error(iscsi_handle(conn), err);
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}
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static inline int
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iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
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{
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uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
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uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
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if (max_cmdsn < exp_cmdsn -1 &&
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max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
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return ISCSI_ERR_MAX_CMDSN;
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if (max_cmdsn > session->max_cmdsn ||
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max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
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session->max_cmdsn = max_cmdsn;
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if (exp_cmdsn > session->exp_cmdsn ||
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exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
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session->exp_cmdsn = exp_cmdsn;
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return 0;
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}
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static inline int
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iscsi_hdr_extract(struct iscsi_conn *conn)
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{
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struct sk_buff *skb = conn->in.skb;
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if (conn->in.copy >= conn->hdr_size &&
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conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
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/*
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* Zero-copy PDU Header: using connection context
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* to store header pointer.
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*/
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if (skb_shinfo(skb)->frag_list == NULL &&
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!skb_shinfo(skb)->nr_frags)
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conn->in.hdr = (struct iscsi_hdr *)
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((char*)skb->data + conn->in.offset);
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else {
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/* ignoring return code since we checked
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* in.copy before */
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skb_copy_bits(skb, conn->in.offset,
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&conn->hdr, conn->hdr_size);
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conn->in.hdr = &conn->hdr;
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}
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conn->in.offset += conn->hdr_size;
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conn->in.copy -= conn->hdr_size;
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} else {
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int hdr_remains;
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int copylen;
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/*
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* PDU header scattered across SKB's,
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* copying it... This'll happen quite rarely.
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*/
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if (conn->in_progress == IN_PROGRESS_WAIT_HEADER)
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conn->in.hdr_offset = 0;
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hdr_remains = conn->hdr_size - conn->in.hdr_offset;
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BUG_ON(hdr_remains <= 0);
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copylen = min(conn->in.copy, hdr_remains);
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skb_copy_bits(skb, conn->in.offset,
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(char*)&conn->hdr + conn->in.hdr_offset, copylen);
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debug_tcp("PDU gather offset %d bytes %d in.offset %d "
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"in.copy %d\n", conn->in.hdr_offset, copylen,
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conn->in.offset, conn->in.copy);
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conn->in.offset += copylen;
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conn->in.copy -= copylen;
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if (copylen < hdr_remains) {
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conn->in_progress = IN_PROGRESS_HEADER_GATHER;
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conn->in.hdr_offset += copylen;
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return -EAGAIN;
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}
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conn->in.hdr = &conn->hdr;
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conn->discontiguous_hdr_cnt++;
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conn->in_progress = IN_PROGRESS_WAIT_HEADER;
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}
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return 0;
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}
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static inline void
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iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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struct scsi_cmnd *sc = ctask->sc;
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struct iscsi_session *session = conn->session;
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spin_lock(&session->lock);
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if (unlikely(!sc)) {
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spin_unlock(&session->lock);
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return;
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}
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if (sc->sc_data_direction == DMA_TO_DEVICE) {
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struct iscsi_data_task *dtask, *n;
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/* WRITE: cleanup Data-Out's if any */
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spin_lock(&conn->lock);
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list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
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list_del(&dtask->item);
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mempool_free(dtask, ctask->datapool);
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}
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spin_unlock(&conn->lock);
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}
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ctask->xmstate = XMSTATE_IDLE;
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ctask->r2t = NULL;
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ctask->sc = NULL;
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__kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
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spin_unlock(&session->lock);
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}
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/**
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* iscsi_cmd_rsp - SCSI Command Response processing
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* @conn: iscsi connection
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* @ctask: scsi command task
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**/
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static int
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iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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int rc;
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struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
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struct iscsi_session *session = conn->session;
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struct scsi_cmnd *sc = ctask->sc;
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rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
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if (rc) {
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sc->result = (DID_ERROR << 16);
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goto out;
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}
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conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
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sc->result = (DID_OK << 16) | rhdr->cmd_status;
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if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
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sc->result = (DID_ERROR << 16);
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goto out;
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}
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if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) {
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int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE);
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memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
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debug_scsi("copied %d bytes of sense\n", sensecopy);
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}
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if (sc->sc_data_direction == DMA_TO_DEVICE)
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goto out;
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if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
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int res_count = be32_to_cpu(rhdr->residual_count);
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if (res_count > 0 && res_count <= sc->request_bufflen)
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sc->resid = res_count;
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else
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sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
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} else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
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sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
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else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
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sc->resid = be32_to_cpu(rhdr->residual_count);
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out:
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debug_scsi("done [sc %lx res %d itt 0x%x]\n",
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(long)sc, sc->result, ctask->itt);
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conn->scsirsp_pdus_cnt++;
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iscsi_ctask_cleanup(conn, ctask);
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sc->scsi_done(sc);
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return rc;
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}
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/**
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* iscsi_data_rsp - SCSI Data-In Response processing
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* @conn: iscsi connection
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* @ctask: scsi command task
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**/
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static int
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iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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int rc;
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struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
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struct iscsi_session *session = conn->session;
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int datasn = be32_to_cpu(rhdr->datasn);
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rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
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if (rc)
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return rc;
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/*
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* setup Data-In byte counter (gets decremented..)
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*/
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ctask->data_count = conn->in.datalen;
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if (conn->in.datalen == 0)
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return 0;
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if (ctask->datasn != datasn)
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return ISCSI_ERR_DATASN;
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ctask->datasn++;
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ctask->data_offset = be32_to_cpu(rhdr->offset);
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if (ctask->data_offset + conn->in.datalen > ctask->total_length)
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|
|
return ISCSI_ERR_DATA_OFFSET;
|
|
|
|
|
|
|
|
if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
|
|
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
|
|
|
|
|
|
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
|
2006-01-14 00:05:38 +00:00
|
|
|
if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
|
2005-08-05 02:30:08 +00:00
|
|
|
int res_count = be32_to_cpu(rhdr->residual_count);
|
|
|
|
|
|
|
|
if (res_count > 0 &&
|
|
|
|
res_count <= sc->request_bufflen) {
|
|
|
|
sc->resid = res_count;
|
|
|
|
sc->result = (DID_OK << 16) | rhdr->cmd_status;
|
|
|
|
} else
|
|
|
|
sc->result = (DID_BAD_TARGET << 16) |
|
|
|
|
rhdr->cmd_status;
|
2006-01-14 00:05:38 +00:00
|
|
|
} else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
|
2005-08-05 02:30:08 +00:00
|
|
|
sc->resid = be32_to_cpu(rhdr->residual_count);
|
|
|
|
sc->result = (DID_OK << 16) | rhdr->cmd_status;
|
|
|
|
} else
|
|
|
|
sc->result = (DID_OK << 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;
|
|
|
|
struct iscsi_data_task *dtask;
|
|
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
|
|
|
|
|
|
dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
|
|
|
|
BUG_ON(!dtask);
|
|
|
|
hdr = &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;
|
|
|
|
|
2005-09-13 02:01:32 +00:00
|
|
|
iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
|
|
|
|
sizeof(struct iscsi_hdr));
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
r2t->dtask = dtask;
|
|
|
|
|
|
|
|
if (sc->use_sg) {
|
|
|
|
int i, sg_count = 0;
|
|
|
|
struct scatterlist *sg = sc->request_buffer;
|
|
|
|
|
|
|
|
r2t->sg = NULL;
|
|
|
|
for (i = 0; i < sc->use_sg; i++, sg += 1) {
|
|
|
|
/* FIXME: prefetch ? */
|
|
|
|
if (sg_count + sg->length > r2t->data_offset) {
|
|
|
|
int page_offset;
|
|
|
|
|
|
|
|
/* sg page found! */
|
|
|
|
|
|
|
|
/* offset within this page */
|
|
|
|
page_offset = r2t->data_offset - sg_count;
|
|
|
|
|
|
|
|
/* fill in this buffer */
|
|
|
|
iscsi_buf_init_sg(&r2t->sendbuf, sg);
|
|
|
|
r2t->sendbuf.sg.offset += page_offset;
|
|
|
|
r2t->sendbuf.sg.length -= page_offset;
|
|
|
|
|
|
|
|
/* xmit logic will continue with next one */
|
|
|
|
r2t->sg = sg + 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
sg_count += sg->length;
|
|
|
|
}
|
|
|
|
BUG_ON(r2t->sg == NULL);
|
|
|
|
} else
|
|
|
|
iscsi_buf_init_iov(&ctask->sendbuf,
|
|
|
|
(char*)sc->request_buffer + r2t->data_offset,
|
|
|
|
r2t->data_count);
|
|
|
|
|
|
|
|
list_add(&dtask->item, &ctask->dataqueue);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
|
|
|
|
int r2tsn = be32_to_cpu(rhdr->r2tsn);
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (conn->in.ahslen)
|
|
|
|
return ISCSI_ERR_AHSLEN;
|
|
|
|
|
|
|
|
if (conn->in.datalen)
|
|
|
|
return ISCSI_ERR_DATALEN;
|
|
|
|
|
|
|
|
if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
|
|
|
|
return ISCSI_ERR_R2TSN;
|
|
|
|
|
|
|
|
rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
/* FIXME: use R2TSN to detect missing R2T */
|
|
|
|
|
|
|
|
/* fill-in new R2T associated with the task */
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
if (!ctask->sc || ctask->mtask ||
|
|
|
|
session->state != ISCSI_STATE_LOGGED_IN) {
|
|
|
|
printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
|
|
|
|
"recovery...\n", ctask->itt);
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
rc = __kfifo_get(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 ||
|
|
|
|
r2t->data_length > session->max_burst) {
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
return ISCSI_ERR_DATALEN;
|
|
|
|
}
|
|
|
|
|
|
|
|
r2t->data_offset = be32_to_cpu(rhdr->data_offset);
|
|
|
|
if (r2t->data_offset + r2t->data_length > ctask->total_length) {
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
return ISCSI_ERR_DATALEN;
|
|
|
|
}
|
|
|
|
|
|
|
|
r2t->ttt = rhdr->ttt; /* no flip */
|
|
|
|
r2t->solicit_datasn = 0;
|
|
|
|
|
|
|
|
iscsi_solicit_data_init(conn, ctask, r2t);
|
|
|
|
|
|
|
|
ctask->exp_r2tsn = r2tsn + 1;
|
|
|
|
ctask->xmstate |= XMSTATE_SOL_HDR;
|
|
|
|
__kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
|
|
|
|
__kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
|
|
|
|
|
|
|
|
schedule_work(&conn->xmitwork);
|
|
|
|
conn->r2t_pdus_cnt++;
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_hdr_recv(struct iscsi_conn *conn)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
struct iscsi_hdr *hdr;
|
|
|
|
struct iscsi_cmd_task *ctask;
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
uint32_t cdgst, rdgst = 0;
|
|
|
|
|
|
|
|
hdr = conn->in.hdr;
|
|
|
|
|
|
|
|
/* verify PDU length */
|
|
|
|
conn->in.datalen = ntoh24(hdr->dlength);
|
|
|
|
if (conn->in.datalen > conn->max_recv_dlength) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
|
|
|
|
conn->in.datalen, conn->max_recv_dlength);
|
|
|
|
return ISCSI_ERR_DATALEN;
|
|
|
|
}
|
|
|
|
conn->data_copied = 0;
|
|
|
|
|
|
|
|
/* read AHS */
|
2005-09-13 02:01:41 +00:00
|
|
|
conn->in.ahslen = hdr->hlength * 4;
|
2005-08-05 02:30:08 +00:00
|
|
|
conn->in.offset += conn->in.ahslen;
|
|
|
|
conn->in.copy -= conn->in.ahslen;
|
|
|
|
if (conn->in.copy < 0) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
|
|
|
|
"%d bytes\n", conn->in.ahslen);
|
|
|
|
return ISCSI_ERR_AHSLEN;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* calculate read padding */
|
|
|
|
conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
|
|
|
|
if (conn->in.padding) {
|
|
|
|
conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
|
|
|
|
debug_scsi("read padding %d bytes\n", conn->in.padding);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (conn->hdrdgst_en) {
|
|
|
|
struct scatterlist sg;
|
|
|
|
|
|
|
|
sg_init_one(&sg, (u8 *)hdr,
|
|
|
|
sizeof(struct iscsi_hdr) + conn->in.ahslen);
|
|
|
|
crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
|
|
|
|
rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
|
|
|
|
conn->in.ahslen);
|
2005-11-30 08:27:19 +00:00
|
|
|
if (cdgst != rdgst) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error "
|
|
|
|
"recv 0x%x calc 0x%x\n", conn->in.itt, rdgst,
|
|
|
|
cdgst);
|
|
|
|
return ISCSI_ERR_HDR_DGST;
|
|
|
|
}
|
2005-08-05 02:30:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* save opcode for later */
|
2005-11-30 05:12:46 +00:00
|
|
|
conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK;
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
/* verify itt (itt encoding: age+cid+itt) */
|
|
|
|
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
|
|
if ((hdr->itt & AGE_MASK) !=
|
|
|
|
(session->age << AGE_SHIFT)) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: received itt %x expected "
|
|
|
|
"session age (%x)\n", hdr->itt,
|
|
|
|
session->age & AGE_MASK);
|
|
|
|
return ISCSI_ERR_BAD_ITT;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: received itt %x, expected "
|
|
|
|
"CID (%x)\n", hdr->itt, conn->id);
|
|
|
|
return ISCSI_ERR_BAD_ITT;
|
|
|
|
}
|
|
|
|
conn->in.itt = hdr->itt & ITT_MASK;
|
|
|
|
} else
|
|
|
|
conn->in.itt = hdr->itt;
|
|
|
|
|
|
|
|
debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
|
|
|
|
hdr->opcode, conn->in.offset, conn->in.copy,
|
|
|
|
conn->in.ahslen, conn->in.datalen);
|
|
|
|
|
|
|
|
if (conn->in.itt < session->cmds_max) {
|
|
|
|
ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt];
|
|
|
|
|
|
|
|
if (!ctask->sc) {
|
|
|
|
printk(KERN_INFO "iscsi_tcp: dropping ctask with "
|
|
|
|
"itt 0x%x\n", ctask->itt);
|
|
|
|
conn->in.datalen = 0; /* force drop */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctask->sc->SCp.phase != session->age) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: ctask's session age %d, "
|
|
|
|
"expected %d\n", ctask->sc->SCp.phase,
|
|
|
|
session->age);
|
|
|
|
return ISCSI_ERR_SESSION_FAILED;
|
|
|
|
}
|
|
|
|
|
|
|
|
conn->in.ctask = ctask;
|
|
|
|
|
|
|
|
debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
|
|
|
|
hdr->opcode, conn->id, (long)ctask->sc,
|
|
|
|
ctask->itt, conn->in.datalen);
|
|
|
|
|
|
|
|
switch(conn->in.opcode) {
|
|
|
|
case ISCSI_OP_SCSI_CMD_RSP:
|
|
|
|
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
|
2005-11-30 05:12:54 +00:00
|
|
|
if (!conn->in.datalen)
|
2005-08-05 02:30:08 +00:00
|
|
|
rc = iscsi_cmd_rsp(conn, ctask);
|
|
|
|
else
|
|
|
|
/*
|
|
|
|
* got sense or response data; copying PDU
|
|
|
|
* Header to the connection's header
|
|
|
|
* placeholder
|
|
|
|
*/
|
|
|
|
memcpy(&conn->hdr, hdr,
|
|
|
|
sizeof(struct iscsi_hdr));
|
|
|
|
break;
|
|
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
|
|
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
|
|
|
|
/* save flags for non-exceptional status */
|
|
|
|
conn->in.flags = hdr->flags;
|
|
|
|
/* save cmd_status for sense data */
|
|
|
|
conn->in.cmd_status =
|
|
|
|
((struct iscsi_data_rsp*)hdr)->cmd_status;
|
|
|
|
rc = iscsi_data_rsp(conn, ctask);
|
|
|
|
break;
|
|
|
|
case ISCSI_OP_R2T:
|
|
|
|
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
|
2005-11-30 05:12:54 +00:00
|
|
|
if (ctask->sc->sc_data_direction == DMA_TO_DEVICE)
|
2005-08-05 02:30:08 +00:00
|
|
|
rc = iscsi_r2t_rsp(conn, ctask);
|
|
|
|
else
|
|
|
|
rc = ISCSI_ERR_PROTO;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET &&
|
|
|
|
conn->in.itt < ISCSI_MGMT_ITT_OFFSET +
|
|
|
|
session->mgmtpool_max) {
|
|
|
|
struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
|
|
|
|
session->mgmt_cmds[conn->in.itt -
|
|
|
|
ISCSI_MGMT_ITT_OFFSET];
|
|
|
|
|
|
|
|
debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
|
|
|
|
conn->in.opcode, conn->id, mtask->itt,
|
|
|
|
conn->in.datalen);
|
|
|
|
|
|
|
|
switch(conn->in.opcode) {
|
|
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
|
|
case ISCSI_OP_TEXT_RSP:
|
2006-01-14 00:05:35 +00:00
|
|
|
case ISCSI_OP_LOGOUT_RSP:
|
2005-08-05 02:30:08 +00:00
|
|
|
rc = iscsi_check_assign_cmdsn(session,
|
|
|
|
(struct iscsi_nopin*)hdr);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (!conn->in.datalen) {
|
|
|
|
rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
|
|
|
|
NULL, 0);
|
|
|
|
if (conn->login_mtask != mtask) {
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
|
|
(void*)&mtask, sizeof(void*));
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ISCSI_OP_SCSI_TMFUNC_RSP:
|
|
|
|
rc = iscsi_check_assign_cmdsn(session,
|
|
|
|
(struct iscsi_nopin*)hdr);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (conn->in.datalen || conn->in.ahslen) {
|
|
|
|
rc = ISCSI_ERR_PROTO;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
conn->tmfrsp_pdus_cnt++;
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
if (conn->tmabort_state == TMABORT_INITIAL) {
|
|
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
|
|
(void*)&mtask, sizeof(void*));
|
|
|
|
conn->tmabort_state =
|
|
|
|
((struct iscsi_tm_rsp *)hdr)->
|
2005-09-13 02:01:38 +00:00
|
|
|
response == ISCSI_TMF_RSP_COMPLETE ?
|
2005-08-05 02:30:08 +00:00
|
|
|
TMABORT_SUCCESS:TMABORT_FAILED;
|
|
|
|
/* unblock eh_abort() */
|
|
|
|
wake_up(&conn->ehwait);
|
|
|
|
}
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
break;
|
2006-01-14 00:05:35 +00:00
|
|
|
case ISCSI_OP_NOOP_IN:
|
2005-09-13 02:02:04 +00:00
|
|
|
if (hdr->ttt != ISCSI_RESERVED_TAG) {
|
|
|
|
rc = ISCSI_ERR_PROTO;
|
|
|
|
break;
|
|
|
|
}
|
2006-01-14 00:05:35 +00:00
|
|
|
rc = iscsi_check_assign_cmdsn(session,
|
2005-09-13 02:02:04 +00:00
|
|
|
(struct iscsi_nopin*)hdr);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
|
|
|
|
|
|
if (!conn->in.datalen) {
|
|
|
|
struct iscsi_mgmt_task *mtask;
|
|
|
|
|
|
|
|
rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
|
|
|
|
NULL, 0);
|
|
|
|
mtask = (struct iscsi_mgmt_task *)
|
|
|
|
session->mgmt_cmds[conn->in.itt -
|
|
|
|
ISCSI_MGMT_ITT_OFFSET];
|
|
|
|
if (conn->login_mtask != mtask) {
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
|
|
(void*)&mtask, sizeof(void*));
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
2005-08-05 02:30:08 +00:00
|
|
|
default:
|
|
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else if (conn->in.itt == ISCSI_RESERVED_TAG) {
|
2005-09-13 02:02:04 +00:00
|
|
|
switch(conn->in.opcode) {
|
|
|
|
case ISCSI_OP_NOOP_IN:
|
|
|
|
if (!conn->in.datalen) {
|
|
|
|
rc = iscsi_check_assign_cmdsn(session,
|
2005-08-05 02:30:08 +00:00
|
|
|
(struct iscsi_nopin*)hdr);
|
2005-09-13 02:02:04 +00:00
|
|
|
if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
|
|
|
|
rc = iscsi_recv_pdu(iscsi_handle(conn),
|
|
|
|
hdr, NULL, 0);
|
2006-01-14 00:05:35 +00:00
|
|
|
} else
|
2005-09-13 02:02:04 +00:00
|
|
|
rc = ISCSI_ERR_PROTO;
|
|
|
|
break;
|
|
|
|
case ISCSI_OP_REJECT:
|
|
|
|
/* we need sth like iscsi_reject_rsp()*/
|
|
|
|
case ISCSI_OP_ASYNC_EVENT:
|
|
|
|
/* we need sth like iscsi_async_event_rsp() */
|
2005-08-05 02:30:08 +00:00
|
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
2005-09-13 02:02:04 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
|
|
break;
|
|
|
|
}
|
2005-08-05 02:30:08 +00:00
|
|
|
} else
|
|
|
|
rc = ISCSI_ERR_BAD_ITT;
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_ctask_copy - copy skb bits to the destanation cmd task
|
|
|
|
* @conn: iscsi connection
|
|
|
|
* @ctask: scsi command task
|
|
|
|
* @buf: buffer to copy to
|
|
|
|
* @buf_size: size of buffer
|
|
|
|
* @offset: offset within the buffer
|
|
|
|
*
|
|
|
|
* Notes:
|
|
|
|
* The function calls skb_copy_bits() and updates per-connection and
|
|
|
|
* per-cmd byte counters.
|
|
|
|
*
|
|
|
|
* Read counters (in bytes):
|
|
|
|
*
|
|
|
|
* conn->in.offset offset within in progress SKB
|
|
|
|
* conn->in.copy left to copy from in progress SKB
|
|
|
|
* including padding
|
|
|
|
* conn->in.copied copied already from in progress SKB
|
|
|
|
* conn->data_copied copied already from in progress buffer
|
|
|
|
* ctask->sent total bytes sent up to the MidLayer
|
|
|
|
* ctask->data_count left to copy from in progress Data-In
|
|
|
|
* buf_left left to copy from in progress buffer
|
|
|
|
**/
|
|
|
|
static inline int
|
|
|
|
iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
|
|
void *buf, int buf_size, int offset)
|
|
|
|
{
|
|
|
|
int buf_left = buf_size - (conn->data_copied + offset);
|
|
|
|
int size = min(conn->in.copy, buf_left);
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
size = min(size, ctask->data_count);
|
|
|
|
|
|
|
|
debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
|
|
|
|
size, conn->in.offset, conn->in.copied);
|
|
|
|
|
|
|
|
BUG_ON(size <= 0);
|
|
|
|
BUG_ON(ctask->sent + size > ctask->total_length);
|
|
|
|
|
|
|
|
rc = skb_copy_bits(conn->in.skb, conn->in.offset,
|
|
|
|
(char*)buf + (offset + conn->data_copied), size);
|
|
|
|
/* must fit into skb->len */
|
|
|
|
BUG_ON(rc);
|
|
|
|
|
|
|
|
conn->in.offset += size;
|
|
|
|
conn->in.copy -= size;
|
|
|
|
conn->in.copied += size;
|
|
|
|
conn->data_copied += size;
|
|
|
|
ctask->sent += size;
|
|
|
|
ctask->data_count -= size;
|
|
|
|
|
|
|
|
BUG_ON(conn->in.copy < 0);
|
|
|
|
BUG_ON(ctask->data_count < 0);
|
|
|
|
|
|
|
|
if (buf_size != (conn->data_copied + offset)) {
|
|
|
|
if (!ctask->data_count) {
|
|
|
|
BUG_ON(buf_size - conn->data_copied < 0);
|
|
|
|
/* done with this PDU */
|
|
|
|
return buf_size - conn->data_copied;
|
|
|
|
}
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* done with this buffer or with both - PDU and buffer */
|
|
|
|
conn->data_copied = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_tcp_copy - copy skb bits to the destanation buffer
|
|
|
|
* @conn: iscsi connection
|
|
|
|
* @buf: buffer to copy to
|
|
|
|
* @buf_size: number of bytes to copy
|
|
|
|
*
|
|
|
|
* Notes:
|
|
|
|
* The function calls skb_copy_bits() and updates per-connection
|
|
|
|
* byte counters.
|
|
|
|
**/
|
|
|
|
static inline int
|
|
|
|
iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
|
|
|
|
{
|
|
|
|
int buf_left = buf_size - conn->data_copied;
|
|
|
|
int size = min(conn->in.copy, buf_left);
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
|
|
|
|
size, conn->in.offset, conn->data_copied);
|
|
|
|
BUG_ON(size <= 0);
|
|
|
|
|
|
|
|
rc = skb_copy_bits(conn->in.skb, conn->in.offset,
|
|
|
|
(char*)buf + conn->data_copied, size);
|
|
|
|
BUG_ON(rc);
|
|
|
|
|
|
|
|
conn->in.offset += size;
|
|
|
|
conn->in.copy -= size;
|
|
|
|
conn->in.copied += size;
|
|
|
|
conn->data_copied += size;
|
|
|
|
|
|
|
|
if (buf_size != conn->data_copied)
|
|
|
|
return -EAGAIN;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
|
|
|
|
int offset, int length)
|
|
|
|
{
|
|
|
|
struct scatterlist temp;
|
|
|
|
|
|
|
|
memcpy(&temp, sg, sizeof(struct scatterlist));
|
|
|
|
temp.offset = offset;
|
|
|
|
temp.length = length;
|
|
|
|
crypto_digest_update(conn->data_rx_tfm, &temp, 1);
|
|
|
|
}
|
|
|
|
|
2005-11-30 05:12:57 +00:00
|
|
|
static void
|
|
|
|
iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len)
|
|
|
|
{
|
|
|
|
struct scatterlist tmp;
|
|
|
|
|
|
|
|
sg_init_one(&tmp, buf, len);
|
|
|
|
crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
|
|
|
|
}
|
|
|
|
|
2005-08-05 02:30:08 +00:00
|
|
|
static int iscsi_scsi_data_in(struct iscsi_conn *conn)
|
|
|
|
{
|
|
|
|
struct iscsi_cmd_task *ctask = conn->in.ctask;
|
|
|
|
struct scsi_cmnd *sc = ctask->sc;
|
2005-11-30 05:12:57 +00:00
|
|
|
struct scatterlist *sg;
|
2005-08-05 02:30:08 +00:00
|
|
|
int i, offset, rc = 0;
|
|
|
|
|
|
|
|
BUG_ON((void*)ctask != sc->SCp.ptr);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* copying Data-In into the Scsi_Cmnd
|
|
|
|
*/
|
|
|
|
if (!sc->use_sg) {
|
|
|
|
i = ctask->data_count;
|
|
|
|
rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
|
|
|
|
sc->request_bufflen, ctask->data_offset);
|
|
|
|
if (rc == -EAGAIN)
|
|
|
|
return rc;
|
2006-01-14 00:05:35 +00:00
|
|
|
if (conn->datadgst_en)
|
2005-11-30 05:12:57 +00:00
|
|
|
iscsi_recv_digest_update(conn, sc->request_buffer, i);
|
2005-08-05 02:30:08 +00:00
|
|
|
rc = 0;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
|
|
|
offset = ctask->data_offset;
|
|
|
|
sg = sc->request_buffer;
|
|
|
|
|
|
|
|
if (ctask->data_offset)
|
|
|
|
for (i = 0; i < ctask->sg_count; i++)
|
|
|
|
offset -= sg[i].length;
|
|
|
|
/* we've passed through partial sg*/
|
|
|
|
if (offset < 0)
|
|
|
|
offset = 0;
|
|
|
|
|
|
|
|
for (i = ctask->sg_count; i < sc->use_sg; i++) {
|
|
|
|
char *dest;
|
|
|
|
|
|
|
|
dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
|
|
|
|
rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
|
|
|
|
sg[i].length, offset);
|
|
|
|
kunmap_atomic(dest, KM_SOFTIRQ0);
|
|
|
|
if (rc == -EAGAIN)
|
|
|
|
/* continue with the next SKB/PDU */
|
|
|
|
return rc;
|
|
|
|
if (!rc) {
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
if (!offset)
|
|
|
|
crypto_digest_update(conn->data_rx_tfm,
|
|
|
|
&sg[i], 1);
|
|
|
|
else
|
|
|
|
partial_sg_digest_update(conn, &sg[i],
|
|
|
|
sg[i].offset + offset,
|
|
|
|
sg[i].length - offset);
|
|
|
|
}
|
|
|
|
offset = 0;
|
|
|
|
ctask->sg_count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!ctask->data_count) {
|
|
|
|
if (rc && conn->datadgst_en)
|
|
|
|
/*
|
|
|
|
* data-in is complete, but buffer not...
|
|
|
|
*/
|
|
|
|
partial_sg_digest_update(conn, &sg[i],
|
|
|
|
sg[i].offset, sg[i].length-rc);
|
|
|
|
rc = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!conn->in.copy)
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
BUG_ON(ctask->data_count);
|
|
|
|
|
|
|
|
done:
|
|
|
|
/* check for non-exceptional status */
|
|
|
|
if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
|
|
|
|
debug_scsi("done [sc %lx res %d itt 0x%x]\n",
|
|
|
|
(long)sc, sc->result, ctask->itt);
|
|
|
|
conn->scsirsp_pdus_cnt++;
|
|
|
|
iscsi_ctask_cleanup(conn, ctask);
|
|
|
|
sc->scsi_done(sc);
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_data_recv(struct iscsi_conn *conn)
|
|
|
|
{
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
switch(conn->in.opcode) {
|
|
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
|
|
rc = iscsi_scsi_data_in(conn);
|
|
|
|
break;
|
|
|
|
case ISCSI_OP_SCSI_CMD_RSP: {
|
|
|
|
/*
|
|
|
|
* SCSI Sense Data:
|
|
|
|
* copying the entire Data Segment.
|
|
|
|
*/
|
|
|
|
if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
|
|
|
|
rc = -EAGAIN;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* check for sense
|
|
|
|
*/
|
|
|
|
conn->in.hdr = &conn->hdr;
|
|
|
|
conn->senselen = (conn->data[0] << 8) | conn->data[1];
|
|
|
|
rc = iscsi_cmd_rsp(conn, conn->in.ctask);
|
2006-01-14 00:05:35 +00:00
|
|
|
if (!rc && conn->datadgst_en)
|
2005-11-30 05:12:57 +00:00
|
|
|
iscsi_recv_digest_update(conn, conn->data,
|
|
|
|
conn->in.datalen);
|
2005-08-05 02:30:08 +00:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ISCSI_OP_TEXT_RSP:
|
|
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
|
|
case ISCSI_OP_NOOP_IN: {
|
|
|
|
struct iscsi_mgmt_task *mtask = NULL;
|
|
|
|
|
|
|
|
if (conn->in.itt != ISCSI_RESERVED_TAG)
|
|
|
|
mtask = (struct iscsi_mgmt_task *)
|
|
|
|
session->mgmt_cmds[conn->in.itt -
|
|
|
|
ISCSI_MGMT_ITT_OFFSET];
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Collect data segment to the connection's data
|
|
|
|
* placeholder
|
|
|
|
*/
|
|
|
|
if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
|
|
|
|
rc = -EAGAIN;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr,
|
|
|
|
conn->data, conn->in.datalen);
|
|
|
|
|
2006-01-14 00:05:35 +00:00
|
|
|
if (!rc && conn->datadgst_en &&
|
2005-11-30 05:12:57 +00:00
|
|
|
conn->in.opcode != ISCSI_OP_LOGIN_RSP)
|
|
|
|
iscsi_recv_digest_update(conn, conn->data,
|
|
|
|
conn->in.datalen);
|
|
|
|
|
2005-08-05 02:30:08 +00:00
|
|
|
if (mtask && conn->login_mtask != mtask) {
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&mtask,
|
|
|
|
sizeof(void*));
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
2005-11-30 05:12:57 +00:00
|
|
|
case ISCSI_OP_ASYNC_EVENT:
|
|
|
|
case ISCSI_OP_REJECT:
|
2005-08-05 02:30:08 +00:00
|
|
|
default:
|
|
|
|
BUG_ON(1);
|
|
|
|
}
|
|
|
|
exit:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_tcp_data_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_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
|
|
|
|
unsigned int offset, size_t len)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
struct iscsi_conn *conn = rd_desc->arg.data;
|
|
|
|
int processed;
|
|
|
|
char pad[ISCSI_PAD_LEN];
|
|
|
|
struct scatterlist sg;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Save current SKB and its offset in the corresponding
|
|
|
|
* connection context.
|
|
|
|
*/
|
2005-09-13 02:01:35 +00:00
|
|
|
conn->in.copy = skb->len - offset;
|
2005-08-05 02:30:08 +00:00
|
|
|
conn->in.offset = offset;
|
|
|
|
conn->in.skb = skb;
|
|
|
|
conn->in.len = conn->in.copy;
|
|
|
|
BUG_ON(conn->in.copy <= 0);
|
|
|
|
debug_tcp("in %d bytes\n", conn->in.copy);
|
|
|
|
|
|
|
|
more:
|
|
|
|
conn->in.copied = 0;
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
if (unlikely(conn->suspend_rx)) {
|
|
|
|
debug_tcp("conn %d Rx suspended!\n", conn->id);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
|
|
|
|
conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
|
|
|
|
rc = iscsi_hdr_extract(conn);
|
|
|
|
if (rc) {
|
|
|
|
if (rc == -EAGAIN)
|
|
|
|
goto nomore;
|
|
|
|
else {
|
|
|
|
iscsi_conn_failure(conn, rc);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Verify and process incoming PDU header.
|
|
|
|
*/
|
|
|
|
rc = iscsi_hdr_recv(conn);
|
|
|
|
if (!rc && conn->in.datalen) {
|
2005-11-30 08:27:19 +00:00
|
|
|
if (conn->datadgst_en) {
|
2005-08-05 02:30:08 +00:00
|
|
|
BUG_ON(!conn->data_rx_tfm);
|
|
|
|
crypto_digest_init(conn->data_rx_tfm);
|
|
|
|
}
|
|
|
|
conn->in_progress = IN_PROGRESS_DATA_RECV;
|
|
|
|
} else if (rc) {
|
|
|
|
iscsi_conn_failure(conn, rc);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
|
2005-11-30 05:12:57 +00:00
|
|
|
uint32_t recv_digest;
|
2005-08-05 02:30:08 +00:00
|
|
|
debug_tcp("extra data_recv offset %d copy %d\n",
|
|
|
|
conn->in.offset, conn->in.copy);
|
2005-11-30 05:12:57 +00:00
|
|
|
skb_copy_bits(conn->in.skb, conn->in.offset,
|
|
|
|
&recv_digest, 4);
|
|
|
|
conn->in.offset += 4;
|
|
|
|
conn->in.copy -= 4;
|
|
|
|
if (recv_digest != conn->in.datadgst) {
|
|
|
|
debug_tcp("iscsi_tcp: data digest error!"
|
|
|
|
"0x%x != 0x%x\n", recv_digest,
|
|
|
|
conn->in.datadgst);
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
|
|
|
|
return 0;
|
|
|
|
} else {
|
|
|
|
debug_tcp("iscsi_tcp: data digest match!"
|
|
|
|
"0x%x == 0x%x\n", recv_digest,
|
|
|
|
conn->in.datadgst);
|
|
|
|
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
2005-08-05 02:30:08 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
|
|
|
|
|
|
|
|
debug_tcp("data_recv offset %d copy %d\n",
|
|
|
|
conn->in.offset, conn->in.copy);
|
|
|
|
|
|
|
|
rc = iscsi_data_recv(conn);
|
|
|
|
if (rc) {
|
|
|
|
if (rc == -EAGAIN) {
|
|
|
|
rd_desc->count = conn->in.datalen -
|
|
|
|
conn->in.ctask->data_count;
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
iscsi_conn_failure(conn, rc);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
conn->in.copy -= conn->in.padding;
|
|
|
|
conn->in.offset += conn->in.padding;
|
2005-11-30 08:27:19 +00:00
|
|
|
if (conn->datadgst_en) {
|
2005-08-05 02:30:08 +00:00
|
|
|
if (conn->in.padding) {
|
|
|
|
debug_tcp("padding -> %d\n", conn->in.padding);
|
|
|
|
memset(pad, 0, conn->in.padding);
|
|
|
|
sg_init_one(&sg, pad, conn->in.padding);
|
|
|
|
crypto_digest_update(conn->data_rx_tfm, &sg, 1);
|
|
|
|
}
|
|
|
|
crypto_digest_final(conn->data_rx_tfm,
|
|
|
|
(u8 *) & conn->in.datadgst);
|
|
|
|
debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
|
|
|
|
conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
|
|
|
|
} else
|
|
|
|
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
|
|
|
}
|
|
|
|
|
|
|
|
debug_tcp("f, processed %d from out of %d padding %d\n",
|
|
|
|
conn->in.offset - offset, (int)len, conn->in.padding);
|
|
|
|
BUG_ON(conn->in.offset - offset > len);
|
|
|
|
|
|
|
|
if (conn->in.offset - offset != len) {
|
|
|
|
debug_tcp("continue to process %d bytes\n",
|
|
|
|
(int)len - (conn->in.offset - offset));
|
|
|
|
goto more;
|
|
|
|
}
|
|
|
|
|
|
|
|
nomore:
|
|
|
|
processed = conn->in.offset - offset;
|
|
|
|
BUG_ON(processed == 0);
|
|
|
|
return processed;
|
|
|
|
|
|
|
|
again:
|
|
|
|
processed = conn->in.offset - offset;
|
|
|
|
debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
|
|
|
|
processed, (int)len, (int)rd_desc->count);
|
|
|
|
BUG_ON(processed == 0);
|
|
|
|
BUG_ON(processed > len);
|
|
|
|
|
|
|
|
conn->rxdata_octets += processed;
|
|
|
|
return processed;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_tcp_data_ready(struct sock *sk, int flag)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = sk->sk_user_data;
|
|
|
|
read_descriptor_t rd_desc;
|
|
|
|
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
|
|
|
|
|
|
/* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
|
|
|
|
rd_desc.arg.data = conn;
|
|
|
|
rd_desc.count = 0;
|
|
|
|
tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
|
|
|
|
|
|
|
|
read_unlock(&sk->sk_callback_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_tcp_state_change(struct sock *sk)
|
|
|
|
{
|
|
|
|
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;
|
|
|
|
|
2005-11-30 05:12:49 +00:00
|
|
|
if ((sk->sk_state == TCP_CLOSE_WAIT ||
|
|
|
|
sk->sk_state == TCP_CLOSE) &&
|
|
|
|
!atomic_read(&sk->sk_rmem_alloc)) {
|
2005-08-05 02:30:08 +00:00
|
|
|
debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
}
|
|
|
|
|
|
|
|
old_state_change = 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;
|
|
|
|
conn->old_write_space(sk);
|
|
|
|
debug_tcp("iscsi_write_space: cid %d\n", conn->id);
|
|
|
|
clear_bit(SUSPEND_BIT, &conn->suspend_tx);
|
|
|
|
schedule_work(&conn->xmitwork);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_conn_set_callbacks(struct iscsi_conn *conn)
|
|
|
|
{
|
|
|
|
struct sock *sk = conn->sock->sk;
|
|
|
|
|
|
|
|
/* assign new callbacks */
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
|
|
sk->sk_user_data = conn;
|
|
|
|
conn->old_data_ready = sk->sk_data_ready;
|
|
|
|
conn->old_state_change = sk->sk_state_change;
|
|
|
|
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_conn *conn)
|
|
|
|
{
|
|
|
|
struct sock *sk = 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 = conn->old_data_ready;
|
|
|
|
sk->sk_state_change = conn->old_state_change;
|
|
|
|
sk->sk_write_space = conn->old_write_space;
|
|
|
|
sk->sk_no_check = 0;
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_send - generic send routine
|
|
|
|
* @sk: kernel's socket
|
|
|
|
* @buf: buffer to write from
|
|
|
|
* @size: actual size to write
|
|
|
|
* @flags: socket's flags
|
|
|
|
*
|
|
|
|
* Notes:
|
|
|
|
* depending on buffer will use tcp_sendpage() or tcp_sendmsg().
|
|
|
|
* buf->sg.offset == -1 tells us that buffer is non S/G and forces
|
|
|
|
* to use tcp_sendmsg().
|
|
|
|
*/
|
|
|
|
static inline int
|
|
|
|
iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags)
|
|
|
|
{
|
|
|
|
int res;
|
|
|
|
|
|
|
|
if ((int)buf->sg.offset >= 0) {
|
|
|
|
int offset = buf->sg.offset + buf->sent;
|
|
|
|
|
|
|
|
/* tcp_sendpage */
|
|
|
|
res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags);
|
|
|
|
} else {
|
|
|
|
struct msghdr msg;
|
|
|
|
|
|
|
|
buf->iov.iov_base = iscsi_buf_iov_base(buf);
|
|
|
|
buf->iov.iov_len = size;
|
|
|
|
|
|
|
|
memset(&msg, 0, sizeof(struct msghdr));
|
|
|
|
|
|
|
|
/* tcp_sendmsg */
|
|
|
|
res = kernel_sendmsg(sk, &msg, &buf->iov, 1, size);
|
|
|
|
}
|
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_sendhdr - send PDU Header via tcp_sendpage()
|
|
|
|
* @conn: iscsi connection
|
|
|
|
* @buf: buffer to write from
|
|
|
|
* @datalen: lenght of data to be sent after the header
|
|
|
|
*
|
|
|
|
* Notes:
|
|
|
|
* (Tx, Fast Path)
|
|
|
|
**/
|
|
|
|
static inline int
|
|
|
|
iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
|
|
|
|
{
|
|
|
|
struct socket *sk = conn->sock;
|
|
|
|
int flags = 0; /* MSG_DONTWAIT; */
|
|
|
|
int res, size;
|
|
|
|
|
|
|
|
size = buf->sg.length - buf->sent;
|
|
|
|
BUG_ON(buf->sent + size > buf->sg.length);
|
|
|
|
if (buf->sent + size != buf->sg.length || datalen)
|
|
|
|
flags |= MSG_MORE;
|
|
|
|
|
|
|
|
res = iscsi_send(sk, buf, size, flags);
|
|
|
|
debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
|
|
|
|
if (res >= 0) {
|
|
|
|
conn->txdata_octets += res;
|
|
|
|
buf->sent += res;
|
|
|
|
if (size != res)
|
|
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
|
|
} else if (res == -EAGAIN) {
|
|
|
|
conn->sendpage_failures_cnt++;
|
|
|
|
set_bit(SUSPEND_BIT, &conn->suspend_tx);
|
|
|
|
} else if (res == -EPIPE)
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_sendpage - send one page of iSCSI Data-Out.
|
|
|
|
* @conn: iscsi connection
|
|
|
|
* @buf: buffer to write from
|
|
|
|
* @count: remaining data
|
|
|
|
* @sent: number of bytes sent
|
|
|
|
*
|
|
|
|
* Notes:
|
|
|
|
* (Tx, Fast Path)
|
|
|
|
**/
|
|
|
|
static inline int
|
|
|
|
iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
|
|
|
|
int *count, int *sent)
|
|
|
|
{
|
|
|
|
struct socket *sk = conn->sock;
|
|
|
|
int flags = 0; /* MSG_DONTWAIT; */
|
|
|
|
int res, size;
|
|
|
|
|
|
|
|
size = buf->sg.length - buf->sent;
|
|
|
|
BUG_ON(buf->sent + size > buf->sg.length);
|
|
|
|
if (size > *count)
|
|
|
|
size = *count;
|
2005-09-13 02:01:28 +00:00
|
|
|
if (buf->sent + size != buf->sg.length || *count != size)
|
2005-08-05 02:30:08 +00:00
|
|
|
flags |= MSG_MORE;
|
|
|
|
|
|
|
|
res = iscsi_send(sk, buf, size, flags);
|
|
|
|
debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
|
|
|
|
size, buf->sent, *count, *sent, res);
|
|
|
|
if (res >= 0) {
|
|
|
|
conn->txdata_octets += res;
|
|
|
|
buf->sent += res;
|
|
|
|
*count -= res;
|
|
|
|
*sent += res;
|
|
|
|
if (size != res)
|
|
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
|
|
} else if (res == -EAGAIN) {
|
|
|
|
conn->sendpage_failures_cnt++;
|
|
|
|
set_bit(SUSPEND_BIT, &conn->suspend_tx);
|
|
|
|
} else if (res == -EPIPE)
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
BUG_ON(!conn->data_tx_tfm);
|
|
|
|
crypto_digest_init(conn->data_tx_tfm);
|
|
|
|
ctask->digest_count = 4;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
iscsi_buf_data_digest_update(struct iscsi_conn *conn, struct iscsi_buf *buf)
|
|
|
|
{
|
|
|
|
struct scatterlist sg;
|
|
|
|
|
|
|
|
if (buf->sg.offset != -1)
|
|
|
|
crypto_digest_update(conn->data_tx_tfm, &buf->sg, 1);
|
|
|
|
else {
|
|
|
|
sg_init_one(&sg, (char *)buf->sg.page, buf->sg.length);
|
|
|
|
crypto_digest_update(conn->data_tx_tfm, &sg, 1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
|
|
struct iscsi_buf *buf, uint32_t *digest, int final)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
int sent = 0;
|
|
|
|
|
|
|
|
if (final)
|
|
|
|
crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
|
|
|
|
|
|
|
|
iscsi_buf_init_virt(buf, (char*)digest, 4);
|
|
|
|
rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
|
|
|
|
if (rc) {
|
|
|
|
ctask->datadigest = *digest;
|
|
|
|
ctask->xmstate |= XMSTATE_DATA_DIGEST;
|
|
|
|
} else
|
|
|
|
ctask->digest_count = 4;
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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 void
|
|
|
|
iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
|
|
struct iscsi_r2t_info *r2t, int left)
|
|
|
|
{
|
|
|
|
struct iscsi_data *hdr;
|
|
|
|
struct iscsi_data_task *dtask;
|
|
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
|
|
int new_offset;
|
|
|
|
|
|
|
|
dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
|
|
|
|
BUG_ON(!dtask);
|
|
|
|
hdr = &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++;
|
|
|
|
|
2005-09-13 02:01:32 +00:00
|
|
|
iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
|
|
|
|
sizeof(struct iscsi_hdr));
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
r2t->dtask = dtask;
|
|
|
|
|
|
|
|
if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
|
|
|
|
BUG_ON(ctask->bad_sg == r2t->sg);
|
|
|
|
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
|
|
|
|
r2t->sg += 1;
|
|
|
|
} else
|
|
|
|
iscsi_buf_init_iov(&ctask->sendbuf,
|
|
|
|
(char*)sc->request_buffer + new_offset,
|
|
|
|
r2t->data_count);
|
|
|
|
|
|
|
|
list_add(&dtask->item, &ctask->dataqueue);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
struct iscsi_data *hdr;
|
|
|
|
struct iscsi_data_task *dtask;
|
|
|
|
|
|
|
|
dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
|
|
|
|
BUG_ON(!dtask);
|
|
|
|
hdr = &dtask->hdr;
|
|
|
|
memset(hdr, 0, sizeof(struct iscsi_data));
|
|
|
|
hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
|
|
|
|
hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
|
|
|
|
ctask->unsol_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 = cpu_to_be32(conn->exp_statsn);
|
|
|
|
hdr->offset = cpu_to_be32(ctask->total_length -
|
|
|
|
ctask->r2t_data_count -
|
|
|
|
ctask->unsol_count);
|
|
|
|
if (ctask->unsol_count > conn->max_xmit_dlength) {
|
|
|
|
hton24(hdr->dlength, conn->max_xmit_dlength);
|
|
|
|
ctask->data_count = conn->max_xmit_dlength;
|
|
|
|
hdr->flags = 0;
|
|
|
|
} else {
|
|
|
|
hton24(hdr->dlength, ctask->unsol_count);
|
|
|
|
ctask->data_count = ctask->unsol_count;
|
|
|
|
hdr->flags = ISCSI_FLAG_CMD_FINAL;
|
|
|
|
}
|
|
|
|
|
2005-09-13 02:01:32 +00:00
|
|
|
iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
|
|
|
|
sizeof(struct iscsi_hdr));
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
list_add(&dtask->item, &ctask->dataqueue);
|
|
|
|
|
|
|
|
ctask->dtask = dtask;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
|
|
|
|
* @conn: iscsi connection
|
|
|
|
* @ctask: scsi command task
|
|
|
|
* @sc: scsi command
|
|
|
|
**/
|
|
|
|
static void
|
|
|
|
iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
|
|
struct scsi_cmnd *sc)
|
|
|
|
{
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
|
|
|
BUG_ON(__kfifo_len(ctask->r2tqueue));
|
|
|
|
|
|
|
|
ctask->sc = sc;
|
|
|
|
ctask->conn = conn;
|
|
|
|
ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
|
|
|
|
ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
|
|
|
|
int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
|
|
|
|
ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
|
|
|
|
(session->age << AGE_SHIFT);
|
|
|
|
ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
|
|
|
|
ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
|
|
|
|
ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
|
|
|
|
memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
|
|
|
|
memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
|
|
|
|
|
|
|
|
ctask->mtask = NULL;
|
|
|
|
ctask->sent = 0;
|
|
|
|
ctask->sg_count = 0;
|
|
|
|
|
|
|
|
ctask->total_length = sc->request_bufflen;
|
|
|
|
|
|
|
|
if (sc->sc_data_direction == DMA_TO_DEVICE) {
|
|
|
|
ctask->exp_r2tsn = 0;
|
|
|
|
ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
|
|
|
|
BUG_ON(ctask->total_length == 0);
|
|
|
|
if (sc->use_sg) {
|
|
|
|
struct scatterlist *sg = sc->request_buffer;
|
|
|
|
|
|
|
|
iscsi_buf_init_sg(&ctask->sendbuf,
|
|
|
|
&sg[ctask->sg_count++]);
|
|
|
|
ctask->sg = sg;
|
|
|
|
ctask->bad_sg = sg + sc->use_sg;
|
|
|
|
} else {
|
|
|
|
iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
|
|
|
|
sc->request_bufflen);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Write counters:
|
|
|
|
*
|
|
|
|
* imm_count bytes to be sent right after
|
|
|
|
* SCSI PDU Header
|
|
|
|
*
|
|
|
|
* unsol_count bytes(as Data-Out) to be sent
|
|
|
|
* without R2T ack right after
|
|
|
|
* immediate data
|
|
|
|
*
|
|
|
|
* r2t_data_count bytes to be sent via R2T ack's
|
|
|
|
*
|
|
|
|
* pad_count bytes to be sent as zero-padding
|
|
|
|
*/
|
|
|
|
ctask->imm_count = 0;
|
|
|
|
ctask->unsol_count = 0;
|
|
|
|
ctask->unsol_datasn = 0;
|
|
|
|
ctask->xmstate = XMSTATE_W_HDR;
|
|
|
|
/* calculate write padding */
|
|
|
|
ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
|
|
|
|
if (ctask->pad_count) {
|
|
|
|
ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
|
|
|
|
debug_scsi("write padding %d bytes\n",
|
|
|
|
ctask->pad_count);
|
|
|
|
ctask->xmstate |= XMSTATE_W_PAD;
|
|
|
|
}
|
|
|
|
if (session->imm_data_en) {
|
|
|
|
if (ctask->total_length >= session->first_burst)
|
|
|
|
ctask->imm_count = min(session->first_burst,
|
|
|
|
conn->max_xmit_dlength);
|
|
|
|
else
|
|
|
|
ctask->imm_count = min(ctask->total_length,
|
|
|
|
conn->max_xmit_dlength);
|
|
|
|
hton24(ctask->hdr.dlength, ctask->imm_count);
|
|
|
|
ctask->xmstate |= XMSTATE_IMM_DATA;
|
|
|
|
} else
|
|
|
|
zero_data(ctask->hdr.dlength);
|
|
|
|
|
|
|
|
if (!session->initial_r2t_en)
|
|
|
|
ctask->unsol_count = min(session->first_burst,
|
|
|
|
ctask->total_length) - ctask->imm_count;
|
|
|
|
if (!ctask->unsol_count)
|
|
|
|
/* No unsolicit Data-Out's */
|
|
|
|
ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
|
|
|
|
else
|
|
|
|
ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
|
|
|
|
|
|
|
|
ctask->r2t_data_count = ctask->total_length -
|
|
|
|
ctask->imm_count -
|
|
|
|
ctask->unsol_count;
|
|
|
|
|
|
|
|
debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
|
|
|
|
"r2t_data %d]\n",
|
|
|
|
ctask->itt, ctask->total_length, ctask->imm_count,
|
|
|
|
ctask->unsol_count, ctask->r2t_data_count);
|
|
|
|
} else {
|
|
|
|
ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
|
|
|
|
if (sc->sc_data_direction == DMA_FROM_DEVICE)
|
|
|
|
ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
|
|
|
|
ctask->datasn = 0;
|
|
|
|
ctask->xmstate = XMSTATE_R_HDR;
|
|
|
|
zero_data(ctask->hdr.dlength);
|
|
|
|
}
|
|
|
|
|
2006-01-14 00:05:35 +00:00
|
|
|
iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
|
2005-09-13 02:01:32 +00:00
|
|
|
sizeof(struct iscsi_hdr));
|
2005-08-05 02:30:08 +00:00
|
|
|
conn->scsicmd_pdus_cnt++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_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.
|
|
|
|
*
|
|
|
|
* Management xmit state machine consists of two states:
|
|
|
|
* IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
|
|
|
|
* IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
|
|
|
|
**/
|
|
|
|
static int
|
|
|
|
iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
|
|
|
|
{
|
|
|
|
|
|
|
|
debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
|
|
|
|
conn->id, mtask->xmstate, mtask->itt);
|
|
|
|
|
|
|
|
if (mtask->xmstate & XMSTATE_IMM_HDR) {
|
|
|
|
mtask->xmstate &= ~XMSTATE_IMM_HDR;
|
|
|
|
if (mtask->data_count)
|
|
|
|
mtask->xmstate |= XMSTATE_IMM_DATA;
|
2005-09-13 02:01:32 +00:00
|
|
|
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
|
|
|
|
conn->stop_stage != STOP_CONN_RECOVER &&
|
|
|
|
conn->hdrdgst_en)
|
|
|
|
iscsi_hdr_digest(conn, &mtask->headbuf,
|
|
|
|
(u8*)mtask->hdrext);
|
2005-08-05 02:30:08 +00:00
|
|
|
if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
|
|
|
|
mtask->xmstate |= XMSTATE_IMM_HDR;
|
|
|
|
if (mtask->data_count)
|
|
|
|
mtask->xmstate &= ~XMSTATE_IMM_DATA;
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mtask->xmstate & XMSTATE_IMM_DATA) {
|
|
|
|
BUG_ON(!mtask->data_count);
|
|
|
|
mtask->xmstate &= ~XMSTATE_IMM_DATA;
|
|
|
|
/* FIXME: implement.
|
|
|
|
* Virtual buffer could be spreaded across multiple pages...
|
|
|
|
*/
|
|
|
|
do {
|
|
|
|
if (iscsi_sendpage(conn, &mtask->sendbuf,
|
|
|
|
&mtask->data_count, &mtask->sent)) {
|
|
|
|
mtask->xmstate |= XMSTATE_IMM_DATA;
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
} while (mtask->data_count);
|
|
|
|
}
|
|
|
|
|
|
|
|
BUG_ON(mtask->xmstate != XMSTATE_IDLE);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
ctask->xmstate &= ~XMSTATE_R_HDR;
|
2006-01-14 00:05:35 +00:00
|
|
|
if (conn->hdrdgst_en)
|
2005-09-13 02:01:32 +00:00
|
|
|
iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
|
2005-08-05 02:30:08 +00:00
|
|
|
if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
|
|
|
|
BUG_ON(ctask->xmstate != XMSTATE_IDLE);
|
|
|
|
return 0; /* wait for Data-In */
|
|
|
|
}
|
|
|
|
ctask->xmstate |= XMSTATE_R_HDR;
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
ctask->xmstate &= ~XMSTATE_W_HDR;
|
2006-01-14 00:05:35 +00:00
|
|
|
if (conn->hdrdgst_en)
|
2005-09-13 02:01:32 +00:00
|
|
|
iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
|
2005-08-05 02:30:08 +00:00
|
|
|
if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
|
|
|
|
ctask->xmstate |= XMSTATE_W_HDR;
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_data_digest(struct iscsi_conn *conn,
|
|
|
|
struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
|
|
|
|
debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
|
|
|
|
if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
|
|
|
|
&ctask->datadigest, 0)) {
|
|
|
|
ctask->xmstate |= XMSTATE_DATA_DIGEST;
|
|
|
|
debug_tcp("resent data digest 0x%x fail!\n",
|
|
|
|
ctask->datadigest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
BUG_ON(!ctask->imm_count);
|
|
|
|
ctask->xmstate &= ~XMSTATE_IMM_DATA;
|
|
|
|
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
iscsi_data_digest_init(conn, ctask);
|
|
|
|
ctask->immdigest = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
|
|
|
|
&ctask->sent)) {
|
|
|
|
ctask->xmstate |= XMSTATE_IMM_DATA;
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
crypto_digest_final(conn->data_tx_tfm,
|
|
|
|
(u8*)&ctask->immdigest);
|
|
|
|
debug_tcp("tx imm sendpage fail 0x%x\n",
|
|
|
|
ctask->datadigest);
|
|
|
|
}
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
if (conn->datadgst_en)
|
|
|
|
iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
|
|
|
|
|
|
|
|
if (!ctask->imm_count)
|
|
|
|
break;
|
|
|
|
iscsi_buf_init_sg(&ctask->sendbuf,
|
|
|
|
&ctask->sg[ctask->sg_count++]);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
|
|
|
|
if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
|
|
|
|
&ctask->immdigest, 1)) {
|
|
|
|
debug_tcp("sending imm digest 0x%x fail!\n",
|
|
|
|
ctask->immdigest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
struct iscsi_data_task *dtask;
|
|
|
|
|
|
|
|
ctask->xmstate |= XMSTATE_UNS_DATA;
|
|
|
|
if (ctask->xmstate & XMSTATE_UNS_INIT) {
|
|
|
|
iscsi_unsolicit_data_init(conn, ctask);
|
|
|
|
BUG_ON(!ctask->dtask);
|
|
|
|
dtask = ctask->dtask;
|
2005-09-13 02:01:32 +00:00
|
|
|
if (conn->hdrdgst_en)
|
|
|
|
iscsi_hdr_digest(conn, &ctask->headbuf,
|
|
|
|
(u8*)dtask->hdrext);
|
2005-08-05 02:30:08 +00:00
|
|
|
ctask->xmstate &= ~XMSTATE_UNS_INIT;
|
|
|
|
}
|
|
|
|
if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
|
|
|
|
ctask->xmstate &= ~XMSTATE_UNS_DATA;
|
|
|
|
ctask->xmstate |= XMSTATE_UNS_HDR;
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
|
|
|
|
ctask->itt, ctask->unsol_count, ctask->sent);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
struct iscsi_data_task *dtask = ctask->dtask;
|
|
|
|
|
|
|
|
BUG_ON(!ctask->data_count);
|
|
|
|
ctask->xmstate &= ~XMSTATE_UNS_DATA;
|
|
|
|
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
iscsi_data_digest_init(conn, ctask);
|
|
|
|
dtask->digest = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
int start = ctask->sent;
|
|
|
|
|
|
|
|
if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
|
|
|
|
&ctask->sent)) {
|
|
|
|
ctask->unsol_count -= ctask->sent - start;
|
|
|
|
ctask->xmstate |= XMSTATE_UNS_DATA;
|
|
|
|
/* will continue with this ctask later.. */
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
crypto_digest_final(conn->data_tx_tfm,
|
|
|
|
(u8 *)&dtask->digest);
|
|
|
|
debug_tcp("tx uns data fail 0x%x\n",
|
|
|
|
dtask->digest);
|
|
|
|
}
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
BUG_ON(ctask->sent > ctask->total_length);
|
|
|
|
ctask->unsol_count -= ctask->sent - start;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* XXX:we may run here with un-initial sendbuf.
|
|
|
|
* so pass it
|
|
|
|
*/
|
|
|
|
if (conn->datadgst_en && ctask->sent - start > 0)
|
|
|
|
iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
|
|
|
|
|
|
|
|
if (!ctask->data_count)
|
|
|
|
break;
|
|
|
|
iscsi_buf_init_sg(&ctask->sendbuf,
|
|
|
|
&ctask->sg[ctask->sg_count++]);
|
|
|
|
}
|
|
|
|
BUG_ON(ctask->unsol_count < 0);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Done with the Data-Out. Next, check if we need
|
|
|
|
* to send another unsolicited Data-Out.
|
|
|
|
*/
|
|
|
|
if (ctask->unsol_count) {
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
if (iscsi_digest_final_send(conn, ctask,
|
|
|
|
&dtask->digestbuf,
|
|
|
|
&dtask->digest, 1)) {
|
|
|
|
debug_tcp("send uns digest 0x%x fail\n",
|
|
|
|
dtask->digest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
debug_tcp("sending uns digest 0x%x, more uns\n",
|
|
|
|
dtask->digest);
|
|
|
|
}
|
|
|
|
ctask->xmstate |= XMSTATE_UNS_INIT;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
|
|
|
|
if (iscsi_digest_final_send(conn, ctask,
|
|
|
|
&dtask->digestbuf,
|
|
|
|
&dtask->digest, 1)) {
|
|
|
|
debug_tcp("send last uns digest 0x%x fail\n",
|
|
|
|
dtask->digest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
debug_tcp("sending uns digest 0x%x\n",dtask->digest);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
struct iscsi_r2t_info *r2t = ctask->r2t;
|
|
|
|
struct iscsi_data_task *dtask = r2t->dtask;
|
|
|
|
int left;
|
|
|
|
|
|
|
|
ctask->xmstate &= ~XMSTATE_SOL_DATA;
|
|
|
|
ctask->dtask = dtask;
|
|
|
|
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
iscsi_data_digest_init(conn, ctask);
|
|
|
|
dtask->digest = 0;
|
|
|
|
}
|
|
|
|
solicit_again:
|
|
|
|
/*
|
|
|
|
* send Data-Out whitnin this R2T sequence.
|
|
|
|
*/
|
|
|
|
if (!r2t->data_count)
|
|
|
|
goto data_out_done;
|
|
|
|
|
|
|
|
if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
|
|
|
|
ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
|
|
/* will continue with this ctask later.. */
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
crypto_digest_final(conn->data_tx_tfm,
|
|
|
|
(u8 *)&dtask->digest);
|
|
|
|
debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
|
|
|
|
}
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
BUG_ON(r2t->data_count < 0);
|
|
|
|
if (conn->datadgst_en)
|
|
|
|
iscsi_buf_data_digest_update(conn, &r2t->sendbuf);
|
|
|
|
|
|
|
|
if (r2t->data_count) {
|
|
|
|
BUG_ON(ctask->sc->use_sg == 0);
|
|
|
|
if (!iscsi_buf_left(&r2t->sendbuf)) {
|
|
|
|
BUG_ON(ctask->bad_sg == r2t->sg);
|
|
|
|
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
|
|
|
|
r2t->sg += 1;
|
|
|
|
}
|
|
|
|
goto solicit_again;
|
|
|
|
}
|
|
|
|
|
|
|
|
data_out_done:
|
|
|
|
/*
|
|
|
|
* Done with this Data-Out. Next, check if we have
|
|
|
|
* to send another Data-Out for this R2T.
|
|
|
|
*/
|
|
|
|
BUG_ON(r2t->data_length - r2t->sent < 0);
|
|
|
|
left = r2t->data_length - r2t->sent;
|
|
|
|
if (left) {
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
if (iscsi_digest_final_send(conn, ctask,
|
|
|
|
&dtask->digestbuf,
|
|
|
|
&dtask->digest, 1)) {
|
|
|
|
debug_tcp("send r2t data digest 0x%x"
|
|
|
|
"fail\n", dtask->digest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
debug_tcp("r2t data send digest 0x%x\n",
|
|
|
|
dtask->digest);
|
|
|
|
}
|
|
|
|
iscsi_solicit_data_cont(conn, ctask, r2t, left);
|
|
|
|
ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
|
|
ctask->xmstate &= ~XMSTATE_SOL_HDR;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Done with this R2T. Check if there are more
|
|
|
|
* outstanding R2Ts ready to be processed.
|
|
|
|
*/
|
|
|
|
BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
|
|
|
|
&dtask->digest, 1)) {
|
|
|
|
debug_tcp("send last r2t data digest 0x%x"
|
|
|
|
"fail\n", dtask->digest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
|
|
|
|
}
|
|
|
|
|
|
|
|
ctask->r2t_data_count -= r2t->data_length;
|
|
|
|
ctask->r2t = NULL;
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
__kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
|
|
|
|
ctask->r2t = r2t;
|
|
|
|
ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
|
|
ctask->xmstate &= ~XMSTATE_SOL_HDR;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
struct iscsi_data_task *dtask = ctask->dtask;
|
|
|
|
int sent;
|
|
|
|
|
|
|
|
ctask->xmstate &= ~XMSTATE_W_PAD;
|
|
|
|
iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
|
|
|
|
ctask->pad_count);
|
|
|
|
if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
|
|
|
|
ctask->xmstate |= XMSTATE_W_PAD;
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
|
|
|
|
/* imm data? */
|
|
|
|
if (!dtask) {
|
|
|
|
if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
|
|
|
|
&ctask->immdigest, 1)) {
|
|
|
|
debug_tcp("send padding digest 0x%x"
|
|
|
|
"fail!\n", ctask->immdigest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
debug_tcp("done with padding, digest 0x%x\n",
|
|
|
|
ctask->datadigest);
|
|
|
|
} else {
|
|
|
|
if (iscsi_digest_final_send(conn, ctask,
|
|
|
|
&dtask->digestbuf,
|
|
|
|
&dtask->digest, 1)) {
|
|
|
|
debug_tcp("send padding digest 0x%x"
|
|
|
|
"fail\n", dtask->digest);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
debug_tcp("done with padding, digest 0x%x\n",
|
|
|
|
dtask->digest);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
|
|
|
|
conn->id, ctask->xmstate, ctask->itt);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* serialize with TMF AbortTask
|
|
|
|
*/
|
|
|
|
if (ctask->mtask)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
if (ctask->xmstate & XMSTATE_R_HDR) {
|
|
|
|
rc = handle_xmstate_r_hdr(conn, ctask);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctask->xmstate & XMSTATE_W_HDR) {
|
|
|
|
rc = handle_xmstate_w_hdr(conn, ctask);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* XXX: for data digest xmit recover */
|
|
|
|
if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
|
|
|
|
rc = handle_xmstate_data_digest(conn, ctask);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctask->xmstate & XMSTATE_IMM_DATA) {
|
|
|
|
rc = handle_xmstate_imm_data(conn, ctask);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctask->xmstate & XMSTATE_UNS_HDR) {
|
|
|
|
BUG_ON(!ctask->unsol_count);
|
|
|
|
ctask->xmstate &= ~XMSTATE_UNS_HDR;
|
|
|
|
unsolicit_head_again:
|
|
|
|
rc = handle_xmstate_uns_hdr(conn, ctask);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctask->xmstate & XMSTATE_UNS_DATA) {
|
|
|
|
rc = handle_xmstate_uns_data(conn, ctask);
|
|
|
|
if (rc == 1)
|
|
|
|
goto unsolicit_head_again;
|
|
|
|
else if (rc)
|
|
|
|
return rc;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctask->xmstate & XMSTATE_SOL_HDR) {
|
|
|
|
struct iscsi_r2t_info *r2t;
|
|
|
|
|
|
|
|
ctask->xmstate &= ~XMSTATE_SOL_HDR;
|
|
|
|
ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
|
|
if (!ctask->r2t)
|
|
|
|
__kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
|
|
|
|
sizeof(void*));
|
|
|
|
solicit_head_again:
|
|
|
|
r2t = ctask->r2t;
|
2005-09-13 02:01:32 +00:00
|
|
|
if (conn->hdrdgst_en)
|
2006-01-14 00:05:35 +00:00
|
|
|
iscsi_hdr_digest(conn, &r2t->headbuf,
|
2005-09-13 02:01:32 +00:00
|
|
|
(u8*)r2t->dtask->hdrext);
|
2005-08-05 02:30:08 +00:00
|
|
|
if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
|
|
|
|
ctask->xmstate &= ~XMSTATE_SOL_DATA;
|
|
|
|
ctask->xmstate |= XMSTATE_SOL_HDR;
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
|
|
|
|
r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
|
|
|
|
r2t->sent);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctask->xmstate & XMSTATE_SOL_DATA) {
|
|
|
|
rc = handle_xmstate_sol_data(conn, ctask);
|
|
|
|
if (rc == 1)
|
|
|
|
goto solicit_head_again;
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
done:
|
|
|
|
/*
|
|
|
|
* Last thing to check is whether we need to send write
|
|
|
|
* padding. Note that we check for xmstate equality, not just the bit.
|
|
|
|
*/
|
|
|
|
if (ctask->xmstate == XMSTATE_W_PAD)
|
|
|
|
rc = handle_xmstate_w_pad(conn, ctask);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* iscsi_data_xmit - xmit any command into the scheduled connection
|
|
|
|
* @conn: iscsi connection
|
|
|
|
*
|
|
|
|
* Notes:
|
|
|
|
* The function can return -EAGAIN in which case the caller must
|
|
|
|
* re-schedule it again later or recover. '0' return code means
|
|
|
|
* successful xmit.
|
|
|
|
**/
|
|
|
|
static int
|
|
|
|
iscsi_data_xmit(struct iscsi_conn *conn)
|
|
|
|
{
|
|
|
|
if (unlikely(conn->suspend_tx)) {
|
|
|
|
debug_tcp("conn %d Tx suspended!\n", conn->id);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Transmit in the following order:
|
|
|
|
*
|
|
|
|
* 1) un-finished xmit (ctask or mtask)
|
|
|
|
* 2) immediate control PDUs
|
|
|
|
* 3) write data
|
|
|
|
* 4) SCSI commands
|
|
|
|
* 5) non-immediate control PDUs
|
|
|
|
*
|
|
|
|
* No need to lock around __kfifo_get as long as
|
|
|
|
* there's one producer and one consumer.
|
|
|
|
*/
|
|
|
|
|
|
|
|
BUG_ON(conn->ctask && conn->mtask);
|
|
|
|
|
|
|
|
if (conn->ctask) {
|
|
|
|
if (iscsi_ctask_xmit(conn, conn->ctask))
|
|
|
|
goto again;
|
|
|
|
/* done with this in-progress ctask */
|
|
|
|
conn->ctask = NULL;
|
|
|
|
}
|
|
|
|
if (conn->mtask) {
|
|
|
|
if (iscsi_mtask_xmit(conn, conn->mtask))
|
|
|
|
goto again;
|
|
|
|
/* done with this in-progress mtask */
|
|
|
|
conn->mtask = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* process immediate first */
|
|
|
|
if (unlikely(__kfifo_len(conn->immqueue))) {
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
|
|
|
|
sizeof(void*))) {
|
|
|
|
if (iscsi_mtask_xmit(conn, conn->mtask))
|
|
|
|
goto again;
|
|
|
|
|
|
|
|
if (conn->mtask->hdr.itt ==
|
|
|
|
cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
|
|
(void*)&conn->mtask, sizeof(void*));
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* done with this mtask */
|
|
|
|
conn->mtask = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* process write queue */
|
|
|
|
while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
|
|
|
|
sizeof(void*))) {
|
|
|
|
if (iscsi_ctask_xmit(conn, conn->ctask))
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* process command queue */
|
|
|
|
while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
|
|
|
|
sizeof(void*))) {
|
|
|
|
if (iscsi_ctask_xmit(conn, conn->ctask))
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
/* done with this ctask */
|
|
|
|
conn->ctask = NULL;
|
|
|
|
|
|
|
|
/* process the rest control plane PDUs, if any */
|
|
|
|
if (unlikely(__kfifo_len(conn->mgmtqueue))) {
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
|
|
|
while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
|
|
|
|
sizeof(void*))) {
|
|
|
|
if (iscsi_mtask_xmit(conn, conn->mtask))
|
|
|
|
goto again;
|
|
|
|
|
|
|
|
if (conn->mtask->hdr.itt ==
|
|
|
|
cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
|
|
(void*)&conn->mtask,
|
|
|
|
sizeof(void*));
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* done with this mtask */
|
|
|
|
conn->mtask = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
again:
|
|
|
|
if (unlikely(conn->suspend_tx))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_xmitworker(void *data)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = data;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* serialize Xmit worker on a per-connection basis.
|
|
|
|
*/
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_lock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
if (iscsi_data_xmit(conn))
|
|
|
|
schedule_work(&conn->xmitwork);
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#define FAILURE_BAD_HOST 1
|
|
|
|
#define FAILURE_SESSION_FAILED 2
|
|
|
|
#define FAILURE_SESSION_FREED 3
|
|
|
|
#define FAILURE_WINDOW_CLOSED 4
|
|
|
|
#define FAILURE_SESSION_TERMINATE 5
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
|
|
|
|
{
|
|
|
|
struct Scsi_Host *host;
|
|
|
|
int reason = 0;
|
|
|
|
struct iscsi_session *session;
|
|
|
|
struct iscsi_conn *conn = NULL;
|
|
|
|
struct iscsi_cmd_task *ctask = NULL;
|
|
|
|
|
|
|
|
sc->scsi_done = done;
|
|
|
|
sc->result = 0;
|
|
|
|
|
|
|
|
host = sc->device->host;
|
|
|
|
session = iscsi_hostdata(host->hostdata);
|
|
|
|
BUG_ON(host != session->host);
|
|
|
|
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
|
|
|
|
if (session->state != ISCSI_STATE_LOGGED_IN) {
|
|
|
|
if (session->state == ISCSI_STATE_FAILED) {
|
|
|
|
reason = FAILURE_SESSION_FAILED;
|
|
|
|
goto reject;
|
|
|
|
} else if (session->state == ISCSI_STATE_TERMINATE) {
|
|
|
|
reason = FAILURE_SESSION_TERMINATE;
|
|
|
|
goto fault;
|
|
|
|
}
|
|
|
|
reason = FAILURE_SESSION_FREED;
|
|
|
|
goto fault;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for iSCSI window and take care of CmdSN wrap-around
|
|
|
|
*/
|
|
|
|
if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
|
|
|
|
reason = FAILURE_WINDOW_CLOSED;
|
|
|
|
goto reject;
|
|
|
|
}
|
|
|
|
|
|
|
|
conn = session->leadconn;
|
|
|
|
|
|
|
|
__kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
|
|
|
|
BUG_ON(ctask->sc);
|
|
|
|
|
|
|
|
sc->SCp.phase = session->age;
|
|
|
|
sc->SCp.ptr = (char*)ctask;
|
|
|
|
iscsi_cmd_init(conn, ctask, sc);
|
|
|
|
|
|
|
|
__kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
|
|
|
|
debug_scsi(
|
|
|
|
"ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
|
|
|
|
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
|
|
|
|
conn->id, (long)sc, ctask->itt, sc->request_bufflen,
|
|
|
|
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
|
2006-01-11 12:16:10 +00:00
|
|
|
if (!in_interrupt() && mutex_trylock(&conn->xmitmutex)) {
|
2005-08-05 02:30:08 +00:00
|
|
|
spin_unlock_irq(host->host_lock);
|
|
|
|
if (iscsi_data_xmit(conn))
|
|
|
|
schedule_work(&conn->xmitwork);
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
spin_lock_irq(host->host_lock);
|
|
|
|
} else
|
|
|
|
schedule_work(&conn->xmitwork);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
reject:
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
|
|
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
|
|
|
|
fault:
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
|
|
|
|
sc->cmnd[0], reason);
|
|
|
|
sc->sense_buffer[0] = 0x70;
|
|
|
|
sc->sense_buffer[2] = NOT_READY;
|
|
|
|
sc->sense_buffer[7] = 0x6;
|
|
|
|
sc->sense_buffer[12] = 0x08;
|
|
|
|
sc->sense_buffer[13] = 0x00;
|
|
|
|
sc->result = (DID_NO_CONNECT << 16);
|
|
|
|
sc->resid = sc->request_bufflen;
|
|
|
|
sc->scsi_done(sc);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-11-30 05:12:59 +00:00
|
|
|
static int
|
|
|
|
iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
|
|
|
|
{
|
|
|
|
if (depth > ISCSI_MAX_CMD_PER_LUN)
|
|
|
|
depth = ISCSI_MAX_CMD_PER_LUN;
|
|
|
|
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
|
|
|
|
return sdev->queue_depth;
|
|
|
|
}
|
|
|
|
|
2005-08-05 02:30:08 +00:00
|
|
|
static int
|
|
|
|
iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
*items = kmalloc(max * sizeof(void*), GFP_KERNEL);
|
|
|
|
if (*items == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
q->max = max;
|
|
|
|
q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
|
|
|
|
if (q->pool == NULL) {
|
|
|
|
kfree(*items);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
|
|
|
|
GFP_KERNEL, NULL);
|
|
|
|
if (q->queue == ERR_PTR(-ENOMEM)) {
|
|
|
|
kfree(q->pool);
|
|
|
|
kfree(*items);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < max; i++) {
|
|
|
|
q->pool[i] = kmalloc(item_size, GFP_KERNEL);
|
|
|
|
if (q->pool[i] == NULL) {
|
|
|
|
int j;
|
|
|
|
|
|
|
|
for (j = 0; j < i; j++)
|
|
|
|
kfree(q->pool[j]);
|
|
|
|
|
|
|
|
kfifo_free(q->queue);
|
|
|
|
kfree(q->pool);
|
|
|
|
kfree(*items);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
memset(q->pool[i], 0, item_size);
|
|
|
|
(*items)[i] = q->pool[i];
|
|
|
|
__kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_pool_free(struct iscsi_queue *q, void **items)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < q->max; i++)
|
|
|
|
kfree(items[i]);
|
|
|
|
kfree(q->pool);
|
|
|
|
kfree(items);
|
|
|
|
}
|
|
|
|
|
|
|
|
static iscsi_connh_t
|
|
|
|
iscsi_conn_create(iscsi_sessionh_t sessionh, uint32_t conn_idx)
|
|
|
|
{
|
|
|
|
struct iscsi_session *session = iscsi_ptr(sessionh);
|
|
|
|
struct iscsi_conn *conn = NULL;
|
|
|
|
|
|
|
|
conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
|
|
|
|
if (conn == NULL)
|
|
|
|
goto conn_alloc_fail;
|
|
|
|
memset(conn, 0, sizeof(struct iscsi_conn));
|
|
|
|
|
|
|
|
conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
|
|
|
|
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
|
|
|
conn->id = conn_idx;
|
|
|
|
conn->exp_statsn = 0;
|
|
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
|
|
|
|
|
|
/* initial operational parameters */
|
|
|
|
conn->hdr_size = sizeof(struct iscsi_hdr);
|
|
|
|
conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
|
|
|
|
conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
|
|
|
|
|
|
|
|
spin_lock_init(&conn->lock);
|
|
|
|
|
|
|
|
/* initialize general xmit PDU commands queue */
|
|
|
|
conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
|
|
|
|
GFP_KERNEL, NULL);
|
|
|
|
if (conn->xmitqueue == ERR_PTR(-ENOMEM))
|
|
|
|
goto xmitqueue_alloc_fail;
|
|
|
|
|
|
|
|
/* initialize write response PDU commands queue */
|
|
|
|
conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
|
|
|
|
GFP_KERNEL, NULL);
|
|
|
|
if (conn->writequeue == ERR_PTR(-ENOMEM))
|
|
|
|
goto writequeue_alloc_fail;
|
|
|
|
|
|
|
|
/* initialize general immediate & non-immediate PDU commands queue */
|
|
|
|
conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
|
|
|
|
GFP_KERNEL, NULL);
|
|
|
|
if (conn->immqueue == ERR_PTR(-ENOMEM))
|
|
|
|
goto immqueue_alloc_fail;
|
|
|
|
|
|
|
|
conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
|
|
|
|
GFP_KERNEL, NULL);
|
|
|
|
if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
|
|
|
|
goto mgmtqueue_alloc_fail;
|
|
|
|
|
|
|
|
INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
|
|
|
|
|
|
|
|
/* allocate login_mtask used for the login/text sequences */
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
if (!__kfifo_get(session->mgmtpool.queue,
|
|
|
|
(void*)&conn->login_mtask,
|
|
|
|
sizeof(void*))) {
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
goto login_mtask_alloc_fail;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
/* allocate initial PDU receive place holder */
|
|
|
|
if (conn->data_size <= PAGE_SIZE)
|
|
|
|
conn->data = kmalloc(conn->data_size, GFP_KERNEL);
|
|
|
|
else
|
|
|
|
conn->data = (void*)__get_free_pages(GFP_KERNEL,
|
|
|
|
get_order(conn->data_size));
|
|
|
|
if (!conn->data)
|
|
|
|
goto max_recv_dlenght_alloc_fail;
|
|
|
|
|
|
|
|
init_timer(&conn->tmabort_timer);
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_init(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
init_waitqueue_head(&conn->ehwait);
|
|
|
|
|
|
|
|
return iscsi_handle(conn);
|
|
|
|
|
|
|
|
max_recv_dlenght_alloc_fail:
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
|
|
|
|
sizeof(void*));
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
login_mtask_alloc_fail:
|
|
|
|
kfifo_free(conn->mgmtqueue);
|
|
|
|
mgmtqueue_alloc_fail:
|
|
|
|
kfifo_free(conn->immqueue);
|
|
|
|
immqueue_alloc_fail:
|
|
|
|
kfifo_free(conn->writequeue);
|
|
|
|
writequeue_alloc_fail:
|
|
|
|
kfifo_free(conn->xmitqueue);
|
|
|
|
xmitqueue_alloc_fail:
|
|
|
|
kfree(conn);
|
|
|
|
conn_alloc_fail:
|
|
|
|
return iscsi_handle(NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_conn_destroy(iscsi_connh_t connh)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = iscsi_ptr(connh);
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_lock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
set_bit(SUSPEND_BIT, &conn->suspend_tx);
|
|
|
|
if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
|
|
|
|
struct sock *sk = conn->sock->sk;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* conn_start() has never been called!
|
|
|
|
* need to cleanup the socket.
|
|
|
|
*/
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
|
|
set_bit(SUSPEND_BIT, &conn->suspend_rx);
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
|
|
|
|
sock_hold(conn->sock->sk);
|
|
|
|
iscsi_conn_restore_callbacks(conn);
|
|
|
|
sock_put(conn->sock->sk);
|
|
|
|
sock_release(conn->sock);
|
|
|
|
conn->sock = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
|
|
|
|
if (session->leadconn == conn) {
|
|
|
|
/*
|
|
|
|
* leading connection? then give up on recovery.
|
|
|
|
*/
|
|
|
|
session->state = ISCSI_STATE_TERMINATE;
|
|
|
|
wake_up(&conn->ehwait);
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Block until all in-progress commands for this connection
|
|
|
|
* time out or fail.
|
|
|
|
*/
|
|
|
|
for (;;) {
|
|
|
|
spin_lock_bh(&conn->lock);
|
|
|
|
if (!session->host->host_busy) { /* OK for ERL == 0 */
|
|
|
|
spin_unlock_bh(&conn->lock);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&conn->lock);
|
|
|
|
msleep_interruptible(500);
|
|
|
|
printk("conn_destroy(): host_busy %d host_failed %d\n",
|
|
|
|
session->host->host_busy, session->host->host_failed);
|
|
|
|
/*
|
|
|
|
* force eh_abort() to unblock
|
|
|
|
*/
|
|
|
|
wake_up(&conn->ehwait);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now free crypto */
|
|
|
|
if (conn->hdrdgst_en || conn->datadgst_en) {
|
|
|
|
if (conn->tx_tfm)
|
|
|
|
crypto_free_tfm(conn->tx_tfm);
|
|
|
|
if (conn->rx_tfm)
|
|
|
|
crypto_free_tfm(conn->rx_tfm);
|
|
|
|
if (conn->data_tx_tfm)
|
|
|
|
crypto_free_tfm(conn->data_tx_tfm);
|
|
|
|
if (conn->data_rx_tfm)
|
|
|
|
crypto_free_tfm(conn->data_rx_tfm);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* free conn->data, size = MaxRecvDataSegmentLength */
|
|
|
|
if (conn->data_size <= PAGE_SIZE)
|
|
|
|
kfree(conn->data);
|
|
|
|
else
|
|
|
|
free_pages((unsigned long)conn->data,
|
|
|
|
get_order(conn->data_size));
|
|
|
|
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
|
|
|
|
sizeof(void*));
|
|
|
|
list_del(&conn->item);
|
|
|
|
if (list_empty(&session->connections))
|
|
|
|
session->leadconn = NULL;
|
|
|
|
if (session->leadconn && session->leadconn == conn)
|
|
|
|
session->leadconn = container_of(session->connections.next,
|
|
|
|
struct iscsi_conn, item);
|
|
|
|
|
|
|
|
if (session->leadconn == NULL)
|
|
|
|
/* none connections exits.. reset sequencing */
|
|
|
|
session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
kfifo_free(conn->xmitqueue);
|
|
|
|
kfifo_free(conn->writequeue);
|
|
|
|
kfifo_free(conn->immqueue);
|
|
|
|
kfifo_free(conn->mgmtqueue);
|
|
|
|
kfree(conn);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh,
|
|
|
|
uint32_t transport_fd, int is_leading)
|
|
|
|
{
|
|
|
|
struct iscsi_session *session = iscsi_ptr(sessionh);
|
|
|
|
struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh);
|
|
|
|
struct sock *sk;
|
|
|
|
struct socket *sock;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
/* lookup for existing socket */
|
|
|
|
sock = sockfd_lookup(transport_fd, &err);
|
|
|
|
if (!sock) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
|
|
|
|
return -EEXIST;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* lookup for existing connection */
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
list_for_each_entry(tmp, &session->connections, item) {
|
|
|
|
if (tmp == conn) {
|
|
|
|
if (conn->c_stage != ISCSI_CONN_STOPPED ||
|
|
|
|
conn->stop_stage == STOP_CONN_TERM) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: can't bind "
|
|
|
|
"non-stopped connection (%d:%d)\n",
|
|
|
|
conn->c_stage, conn->stop_stage);
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (tmp != conn) {
|
|
|
|
/* bind new iSCSI connection to session */
|
|
|
|
conn->session = session;
|
|
|
|
|
|
|
|
list_add(&conn->item, &session->connections);
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
if (conn->stop_stage != STOP_CONN_SUSPEND) {
|
|
|
|
/* bind iSCSI connection and socket */
|
|
|
|
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.
|
|
|
|
*/
|
|
|
|
iscsi_conn_set_callbacks(conn);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* set receive state machine into initial state
|
|
|
|
*/
|
|
|
|
conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (is_leading)
|
|
|
|
session->leadconn = conn;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Unblock xmitworker(), Login Phase will pass through.
|
|
|
|
*/
|
|
|
|
clear_bit(SUSPEND_BIT, &conn->suspend_rx);
|
|
|
|
clear_bit(SUSPEND_BIT, &conn->suspend_tx);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_conn_start(iscsi_connh_t connh)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = iscsi_ptr(connh);
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
struct sock *sk;
|
|
|
|
|
|
|
|
/* FF phase warming up... */
|
|
|
|
|
|
|
|
if (session == NULL) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
|
|
|
|
return -EPERM;
|
|
|
|
}
|
|
|
|
|
|
|
|
sk = conn->sock->sk;
|
|
|
|
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
conn->c_stage = ISCSI_CONN_STARTED;
|
|
|
|
session->state = ISCSI_STATE_LOGGED_IN;
|
|
|
|
|
|
|
|
switch(conn->stop_stage) {
|
|
|
|
case STOP_CONN_RECOVER:
|
|
|
|
/*
|
|
|
|
* unblock eh_abort() if it is blocked. re-try all
|
|
|
|
* commands after successful recovery
|
|
|
|
*/
|
|
|
|
session->conn_cnt++;
|
|
|
|
conn->stop_stage = 0;
|
|
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
|
|
session->age++;
|
|
|
|
wake_up(&conn->ehwait);
|
|
|
|
break;
|
|
|
|
case STOP_CONN_TERM:
|
|
|
|
session->conn_cnt++;
|
|
|
|
conn->stop_stage = 0;
|
|
|
|
break;
|
|
|
|
case STOP_CONN_SUSPEND:
|
|
|
|
conn->stop_stage = 0;
|
|
|
|
clear_bit(SUSPEND_BIT, &conn->suspend_rx);
|
|
|
|
clear_bit(SUSPEND_BIT, &conn->suspend_tx);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_conn_stop(iscsi_connh_t connh, int flag)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = iscsi_ptr(connh);
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
struct sock *sk;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
BUG_ON(!conn->sock);
|
|
|
|
sk = conn->sock->sk;
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
|
|
set_bit(SUSPEND_BIT, &conn->suspend_rx);
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_lock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
spin_lock_irqsave(session->host->host_lock, flags);
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
conn->stop_stage = flag;
|
|
|
|
conn->c_stage = ISCSI_CONN_STOPPED;
|
|
|
|
set_bit(SUSPEND_BIT, &conn->suspend_tx);
|
|
|
|
|
|
|
|
if (flag != STOP_CONN_SUSPEND)
|
|
|
|
session->conn_cnt--;
|
|
|
|
|
|
|
|
if (session->conn_cnt == 0 || session->leadconn == conn)
|
|
|
|
session->state = ISCSI_STATE_FAILED;
|
|
|
|
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
spin_unlock_irqrestore(session->host->host_lock, flags);
|
|
|
|
|
|
|
|
if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
|
|
|
|
struct iscsi_cmd_task *ctask;
|
|
|
|
struct iscsi_mgmt_task *mtask;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Socket must go now.
|
|
|
|
*/
|
|
|
|
sock_hold(conn->sock->sk);
|
|
|
|
iscsi_conn_restore_callbacks(conn);
|
|
|
|
sock_put(conn->sock->sk);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* flush xmit queues.
|
|
|
|
*/
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
while (__kfifo_get(conn->writequeue, (void*)&ctask,
|
|
|
|
sizeof(void*)) ||
|
|
|
|
__kfifo_get(conn->xmitqueue, (void*)&ctask,
|
|
|
|
sizeof(void*))) {
|
|
|
|
struct iscsi_r2t_info *r2t;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* flush ctask's r2t queues
|
|
|
|
*/
|
|
|
|
while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
|
|
|
|
sizeof(void*)))
|
|
|
|
__kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
|
|
|
|
sizeof(void*));
|
|
|
|
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
local_bh_disable();
|
|
|
|
iscsi_ctask_cleanup(conn, ctask);
|
|
|
|
local_bh_enable();
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
}
|
|
|
|
conn->ctask = NULL;
|
|
|
|
while (__kfifo_get(conn->immqueue, (void*)&mtask,
|
|
|
|
sizeof(void*)) ||
|
|
|
|
__kfifo_get(conn->mgmtqueue, (void*)&mtask,
|
|
|
|
sizeof(void*))) {
|
|
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
|
|
(void*)&mtask, sizeof(void*));
|
|
|
|
}
|
|
|
|
conn->mtask = NULL;
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* release socket only after we stopped data_xmit()
|
|
|
|
* activity and flushed all outstandings
|
|
|
|
*/
|
|
|
|
sock_release(conn->sock);
|
|
|
|
conn->sock = NULL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* for connection level recovery we should not calculate
|
|
|
|
* header digest. conn->hdr_size used for optimization
|
|
|
|
* in hdr_extract() and will be re-negotiated at
|
|
|
|
* set_param() time.
|
|
|
|
*/
|
2005-11-30 08:27:19 +00:00
|
|
|
if (flag == STOP_CONN_RECOVER) {
|
2005-08-05 02:30:08 +00:00
|
|
|
conn->hdr_size = sizeof(struct iscsi_hdr);
|
2005-11-30 08:27:19 +00:00
|
|
|
conn->hdrdgst_en = 0;
|
|
|
|
conn->datadgst_en = 0;
|
|
|
|
}
|
2005-08-05 02:30:08 +00:00
|
|
|
}
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
|
|
char *data, uint32_t data_size)
|
|
|
|
{
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
|
|
|
|
struct iscsi_mgmt_task *mtask;
|
|
|
|
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
if (session->state == ISCSI_STATE_TERMINATE) {
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
return -EPERM;
|
|
|
|
}
|
|
|
|
if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
|
|
|
|
hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
|
|
|
|
/*
|
|
|
|
* Login and Text are sent serially, in
|
|
|
|
* request-followed-by-response sequence.
|
|
|
|
* Same mtask can be used. Same ITT must be used.
|
|
|
|
* Note that login_mtask is preallocated at conn_create().
|
|
|
|
*/
|
|
|
|
mtask = conn->login_mtask;
|
|
|
|
else {
|
|
|
|
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
|
|
|
|
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
|
|
|
|
|
|
|
|
if (!__kfifo_get(session->mgmtpool.queue,
|
|
|
|
(void*)&mtask, sizeof(void*))) {
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
return -ENOSPC;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* pre-format CmdSN and ExpStatSN for outgoing PDU.
|
|
|
|
*/
|
|
|
|
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
|
|
hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
|
|
|
|
(session->age << AGE_SHIFT);
|
|
|
|
nop->cmdsn = cpu_to_be32(session->cmdsn);
|
|
|
|
if (conn->c_stage == ISCSI_CONN_STARTED &&
|
|
|
|
!(hdr->opcode & ISCSI_OP_IMMEDIATE))
|
|
|
|
session->cmdsn++;
|
|
|
|
} else
|
|
|
|
/* do not advance CmdSN */
|
|
|
|
nop->cmdsn = cpu_to_be32(session->cmdsn);
|
|
|
|
|
|
|
|
nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
|
|
|
|
|
|
|
|
memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
|
|
|
|
|
2005-09-13 02:01:32 +00:00
|
|
|
iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
|
2005-08-05 02:30:08 +00:00
|
|
|
sizeof(struct iscsi_hdr));
|
|
|
|
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
if (data_size) {
|
|
|
|
memcpy(mtask->data, data, data_size);
|
|
|
|
mtask->data_count = data_size;
|
|
|
|
} else
|
|
|
|
mtask->data_count = 0;
|
|
|
|
|
|
|
|
mtask->xmstate = XMSTATE_IMM_HDR;
|
|
|
|
|
|
|
|
if (mtask->data_count) {
|
|
|
|
iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
|
|
|
|
mtask->data_count);
|
|
|
|
}
|
|
|
|
|
|
|
|
debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
|
|
|
|
hdr->opcode, hdr->itt, data_size);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* since send_pdu() could be called at least from two contexts,
|
|
|
|
* we need to serialize __kfifo_put, so we don't have to take
|
|
|
|
* additional lock on fast data-path
|
|
|
|
*/
|
|
|
|
if (hdr->opcode & ISCSI_OP_IMMEDIATE)
|
|
|
|
__kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
|
|
|
|
else
|
|
|
|
__kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
|
|
|
|
|
|
|
|
schedule_work(&conn->xmitwork);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_eh_host_reset(struct scsi_cmnd *sc)
|
|
|
|
{
|
|
|
|
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
|
|
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
if (session->state == ISCSI_STATE_TERMINATE) {
|
|
|
|
debug_scsi("failing host reset: session terminated "
|
|
|
|
"[CID %d age %d]", conn->id, session->age);
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
return FAILED;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
debug_scsi("failing connection CID %d due to SCSI host reset "
|
|
|
|
"[itt 0x%x age %d]", conn->id, ctask->itt,
|
|
|
|
session->age);
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
|
|
|
|
return SUCCESS;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_tmabort_timedout(unsigned long data)
|
|
|
|
{
|
|
|
|
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
|
|
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
if (conn->tmabort_state == TMABORT_INITIAL) {
|
|
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
|
|
(void*)&ctask->mtask, sizeof(void*));
|
|
|
|
conn->tmabort_state = TMABORT_TIMEDOUT;
|
|
|
|
debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
|
|
|
|
(long)ctask->sc, ctask->itt);
|
|
|
|
/* unblock eh_abort() */
|
|
|
|
wake_up(&conn->ehwait);
|
|
|
|
}
|
|
|
|
spin_unlock(&session->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_eh_abort(struct scsi_cmnd *sc)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
|
|
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
|
|
|
conn->eh_abort_cnt++;
|
|
|
|
debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* two cases for ERL=0 here:
|
|
|
|
*
|
|
|
|
* 1) connection-level failure;
|
|
|
|
* 2) recovery due protocol error;
|
|
|
|
*/
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_lock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
if (session->state != ISCSI_STATE_LOGGED_IN) {
|
|
|
|
if (session->state == ISCSI_STATE_TERMINATE) {
|
|
|
|
spin_unlock_bh(&session->lock);
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
goto failed;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
} else {
|
|
|
|
struct iscsi_tm *hdr = &conn->tmhdr;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Still LOGGED_IN...
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (!ctask->sc || sc->SCp.phase != session->age) {
|
|
|
|
/*
|
|
|
|
* 1) ctask completed before time out. But session
|
|
|
|
* is still ok => Happy Retry.
|
|
|
|
* 2) session was re-open during time out of ctask.
|
|
|
|
*/
|
|
|
|
spin_unlock_bh(&session->lock);
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
goto success;
|
|
|
|
}
|
|
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ctask timed out but session is OK
|
|
|
|
* ERL=0 requires task mgmt abort to be issued on each
|
|
|
|
* failed command. requests must be serialized.
|
|
|
|
*/
|
|
|
|
memset(hdr, 0, sizeof(struct iscsi_tm));
|
|
|
|
hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
|
|
|
|
hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
|
|
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
|
|
memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
|
|
|
|
hdr->rtt = ctask->hdr.itt;
|
|
|
|
hdr->refcmdsn = ctask->hdr.cmdsn;
|
|
|
|
|
|
|
|
rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
|
|
|
|
NULL, 0);
|
|
|
|
if (rc) {
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
|
|
|
|
} else {
|
|
|
|
struct iscsi_r2t_info *r2t;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* TMF abort vs. TMF response race logic
|
|
|
|
*/
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
ctask->mtask = (struct iscsi_mgmt_task *)
|
|
|
|
session->mgmt_cmds[(hdr->itt & ITT_MASK) -
|
|
|
|
ISCSI_MGMT_ITT_OFFSET];
|
|
|
|
/*
|
|
|
|
* have to flush r2tqueue to avoid r2t leaks
|
|
|
|
*/
|
|
|
|
while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
|
|
|
|
sizeof(void*))) {
|
|
|
|
__kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
|
|
|
|
sizeof(void*));
|
|
|
|
}
|
|
|
|
if (conn->tmabort_state == TMABORT_INITIAL) {
|
|
|
|
conn->tmfcmd_pdus_cnt++;
|
|
|
|
conn->tmabort_timer.expires = 3*HZ + jiffies;
|
|
|
|
conn->tmabort_timer.function =
|
|
|
|
iscsi_tmabort_timedout;
|
|
|
|
conn->tmabort_timer.data = (unsigned long)ctask;
|
|
|
|
add_timer(&conn->tmabort_timer);
|
|
|
|
debug_scsi("abort sent [itt 0x%x]", ctask->itt);
|
|
|
|
} else {
|
|
|
|
if (!ctask->sc ||
|
|
|
|
conn->tmabort_state == TMABORT_SUCCESS) {
|
|
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
|
|
spin_unlock_bh(&session->lock);
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
goto success;
|
|
|
|
}
|
|
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
}
|
|
|
|
}
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* block eh thread until:
|
|
|
|
*
|
|
|
|
* 1) abort response;
|
|
|
|
* 2) abort timeout;
|
|
|
|
* 3) session re-opened;
|
|
|
|
* 4) session terminated;
|
|
|
|
*/
|
|
|
|
for (;;) {
|
|
|
|
int p_state = session->state;
|
|
|
|
|
|
|
|
rc = wait_event_interruptible(conn->ehwait,
|
|
|
|
(p_state == ISCSI_STATE_LOGGED_IN ?
|
|
|
|
(session->state == ISCSI_STATE_TERMINATE ||
|
|
|
|
conn->tmabort_state != TMABORT_INITIAL) :
|
|
|
|
(session->state == ISCSI_STATE_TERMINATE ||
|
|
|
|
session->state == ISCSI_STATE_LOGGED_IN)));
|
|
|
|
if (rc) {
|
|
|
|
/* shutdown.. */
|
|
|
|
session->state = ISCSI_STATE_TERMINATE;
|
|
|
|
goto failed;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (signal_pending(current))
|
|
|
|
flush_signals(current);
|
|
|
|
|
|
|
|
if (session->state == ISCSI_STATE_TERMINATE)
|
|
|
|
goto failed;
|
|
|
|
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
if (sc->SCp.phase == session->age &&
|
|
|
|
(conn->tmabort_state == TMABORT_TIMEDOUT ||
|
|
|
|
conn->tmabort_state == TMABORT_FAILED)) {
|
|
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
|
|
if (!ctask->sc) {
|
|
|
|
/*
|
|
|
|
* ctask completed before tmf abort response or
|
|
|
|
* time out.
|
|
|
|
* But session is still ok => Happy Retry.
|
|
|
|
*/
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
success:
|
|
|
|
debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
|
|
|
|
rc = SUCCESS;
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
failed:
|
|
|
|
debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
|
|
|
|
rc = FAILED;
|
|
|
|
|
|
|
|
exit:
|
|
|
|
del_timer_sync(&conn->tmabort_timer);
|
|
|
|
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_lock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
if (conn->sock) {
|
|
|
|
struct sock *sk = conn->sock->sk;
|
|
|
|
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
|
|
iscsi_ctask_cleanup(conn, ctask);
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
}
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
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];
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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(&ctask->r2tpool, session->max_r2t * 4,
|
|
|
|
(void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
|
|
|
|
goto r2t_alloc_fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* R2T xmit queue */
|
|
|
|
ctask->r2tqueue = kfifo_alloc(
|
|
|
|
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
|
|
|
|
if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
|
|
|
|
iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
|
|
|
|
goto r2t_alloc_fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* number of
|
|
|
|
* Data-Out PDU's within R2T-sequence can be quite big;
|
|
|
|
* using mempool
|
|
|
|
*/
|
|
|
|
ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
|
|
|
|
mempool_alloc_slab, mempool_free_slab, taskcache);
|
|
|
|
if (ctask->datapool == NULL) {
|
|
|
|
kfifo_free(ctask->r2tqueue);
|
|
|
|
iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
|
|
|
|
goto r2t_alloc_fail;
|
|
|
|
}
|
|
|
|
INIT_LIST_HEAD(&ctask->dataqueue);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
r2t_alloc_fail:
|
|
|
|
for (i = 0; i < cmd_i; i++) {
|
|
|
|
mempool_destroy(session->cmds[i]->datapool);
|
|
|
|
kfifo_free(session->cmds[i]->r2tqueue);
|
|
|
|
iscsi_pool_free(&session->cmds[i]->r2tpool,
|
|
|
|
(void**)session->cmds[i]->r2ts);
|
|
|
|
}
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_r2tpool_free(struct iscsi_session *session)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < session->cmds_max; i++) {
|
|
|
|
mempool_destroy(session->cmds[i]->datapool);
|
|
|
|
kfifo_free(session->cmds[i]->r2tqueue);
|
|
|
|
iscsi_pool_free(&session->cmds[i]->r2tpool,
|
|
|
|
(void**)session->cmds[i]->r2ts);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct scsi_host_template iscsi_sht = {
|
|
|
|
.name = "iSCSI Initiator over TCP/IP, v."
|
|
|
|
ISCSI_VERSION_STR,
|
2005-11-30 05:12:59 +00:00
|
|
|
.queuecommand = iscsi_queuecommand,
|
|
|
|
.change_queue_depth = iscsi_change_queue_depth,
|
2005-08-05 02:30:08 +00:00
|
|
|
.can_queue = ISCSI_XMIT_CMDS_MAX - 1,
|
|
|
|
.sg_tablesize = ISCSI_SG_TABLESIZE,
|
2005-11-30 05:12:59 +00:00
|
|
|
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
|
|
|
|
.eh_abort_handler = iscsi_eh_abort,
|
|
|
|
.eh_host_reset_handler = iscsi_eh_host_reset,
|
|
|
|
.use_clustering = DISABLE_CLUSTERING,
|
2005-08-05 02:30:08 +00:00
|
|
|
.proc_name = "iscsi_tcp",
|
|
|
|
.this_id = -1,
|
|
|
|
};
|
|
|
|
|
|
|
|
static iscsi_sessionh_t
|
|
|
|
iscsi_session_create(uint32_t initial_cmdsn, struct Scsi_Host *host)
|
|
|
|
{
|
|
|
|
int cmd_i;
|
|
|
|
struct iscsi_session *session;
|
|
|
|
|
|
|
|
session = iscsi_hostdata(host->hostdata);
|
|
|
|
memset(session, 0, sizeof(struct iscsi_session));
|
|
|
|
|
|
|
|
session->host = host;
|
|
|
|
session->id = host->host_no;
|
|
|
|
session->state = ISCSI_STATE_LOGGED_IN;
|
|
|
|
session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
|
|
|
|
session->cmds_max = ISCSI_XMIT_CMDS_MAX;
|
|
|
|
session->cmdsn = initial_cmdsn;
|
|
|
|
session->exp_cmdsn = initial_cmdsn + 1;
|
|
|
|
session->max_cmdsn = initial_cmdsn + 1;
|
|
|
|
session->max_r2t = 1;
|
|
|
|
|
|
|
|
/* initialize SCSI PDU commands pool */
|
|
|
|
if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
|
|
|
|
(void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
|
|
|
|
goto cmdpool_alloc_fail;
|
|
|
|
|
|
|
|
/* pre-format cmds pool with ITT */
|
|
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
|
|
|
|
session->cmds[cmd_i]->itt = cmd_i;
|
|
|
|
|
|
|
|
spin_lock_init(&session->lock);
|
|
|
|
INIT_LIST_HEAD(&session->connections);
|
|
|
|
|
|
|
|
/* initialize immediate command pool */
|
|
|
|
if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
|
|
|
|
(void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
|
|
|
|
goto mgmtpool_alloc_fail;
|
|
|
|
|
|
|
|
|
|
|
|
/* pre-format immediate cmds pool with ITT */
|
|
|
|
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
|
|
|
|
session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
|
|
|
|
session->mgmt_cmds[cmd_i]->data = kmalloc(
|
|
|
|
DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
|
|
|
|
if (!session->mgmt_cmds[cmd_i]->data) {
|
|
|
|
int j;
|
|
|
|
|
|
|
|
for (j = 0; j < cmd_i; j++)
|
|
|
|
kfree(session->mgmt_cmds[j]->data);
|
|
|
|
goto immdata_alloc_fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (iscsi_r2tpool_alloc(session))
|
|
|
|
goto r2tpool_alloc_fail;
|
|
|
|
|
|
|
|
return iscsi_handle(session);
|
|
|
|
|
|
|
|
r2tpool_alloc_fail:
|
|
|
|
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
|
|
|
|
kfree(session->mgmt_cmds[cmd_i]->data);
|
|
|
|
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
|
|
|
|
immdata_alloc_fail:
|
|
|
|
mgmtpool_alloc_fail:
|
|
|
|
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
|
|
|
|
cmdpool_alloc_fail:
|
|
|
|
return iscsi_handle(NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_session_destroy(iscsi_sessionh_t sessionh)
|
|
|
|
{
|
|
|
|
int cmd_i;
|
|
|
|
struct iscsi_data_task *dtask, *n;
|
|
|
|
struct iscsi_session *session = iscsi_ptr(sessionh);
|
|
|
|
|
|
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
|
|
|
|
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
|
|
|
|
list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
|
|
|
|
list_del(&dtask->item);
|
|
|
|
mempool_free(dtask, ctask->datapool);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
|
|
|
|
kfree(session->mgmt_cmds[cmd_i]->data);
|
|
|
|
|
|
|
|
iscsi_r2tpool_free(session);
|
|
|
|
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
|
|
|
|
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param,
|
|
|
|
uint32_t value)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = iscsi_ptr(connh);
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
|
|
|
|
conn->stop_stage != STOP_CONN_RECOVER) {
|
|
|
|
printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
|
|
|
|
param);
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
switch(param) {
|
|
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH: {
|
|
|
|
char *saveptr = conn->data;
|
2005-12-15 09:17:19 +00:00
|
|
|
gfp_t flags = GFP_KERNEL;
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
if (conn->data_size >= value) {
|
|
|
|
conn->max_recv_dlength = value;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_bh(&session->lock);
|
|
|
|
if (conn->stop_stage == STOP_CONN_RECOVER)
|
|
|
|
flags = GFP_ATOMIC;
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
|
|
|
|
if (value <= PAGE_SIZE)
|
|
|
|
conn->data = kmalloc(value, flags);
|
|
|
|
else
|
|
|
|
conn->data = (void*)__get_free_pages(flags,
|
|
|
|
get_order(value));
|
|
|
|
if (conn->data == NULL) {
|
|
|
|
conn->data = saveptr;
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
if (conn->data_size <= PAGE_SIZE)
|
|
|
|
kfree(saveptr);
|
|
|
|
else
|
|
|
|
free_pages((unsigned long)saveptr,
|
|
|
|
get_order(conn->data_size));
|
|
|
|
conn->max_recv_dlength = value;
|
|
|
|
conn->data_size = value;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
|
|
|
conn->max_xmit_dlength = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
|
|
conn->hdrdgst_en = value;
|
|
|
|
conn->hdr_size = sizeof(struct iscsi_hdr);
|
|
|
|
if (conn->hdrdgst_en) {
|
|
|
|
conn->hdr_size += sizeof(__u32);
|
|
|
|
if (!conn->tx_tfm)
|
|
|
|
conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
|
|
|
|
if (!conn->tx_tfm)
|
|
|
|
return -ENOMEM;
|
|
|
|
if (!conn->rx_tfm)
|
|
|
|
conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
|
|
|
|
if (!conn->rx_tfm) {
|
|
|
|
crypto_free_tfm(conn->tx_tfm);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (conn->tx_tfm)
|
|
|
|
crypto_free_tfm(conn->tx_tfm);
|
|
|
|
if (conn->rx_tfm)
|
|
|
|
crypto_free_tfm(conn->rx_tfm);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
|
|
conn->datadgst_en = value;
|
|
|
|
if (conn->datadgst_en) {
|
|
|
|
if (!conn->data_tx_tfm)
|
|
|
|
conn->data_tx_tfm =
|
|
|
|
crypto_alloc_tfm("crc32c", 0);
|
|
|
|
if (!conn->data_tx_tfm)
|
|
|
|
return -ENOMEM;
|
|
|
|
if (!conn->data_rx_tfm)
|
|
|
|
conn->data_rx_tfm =
|
|
|
|
crypto_alloc_tfm("crc32c", 0);
|
|
|
|
if (!conn->data_rx_tfm) {
|
|
|
|
crypto_free_tfm(conn->data_tx_tfm);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (conn->data_tx_tfm)
|
|
|
|
crypto_free_tfm(conn->data_tx_tfm);
|
|
|
|
if (conn->data_rx_tfm)
|
|
|
|
crypto_free_tfm(conn->data_rx_tfm);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_INITIAL_R2T_EN:
|
|
|
|
session->initial_r2t_en = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
|
|
if (session->max_r2t == roundup_pow_of_two(value))
|
|
|
|
break;
|
|
|
|
iscsi_r2tpool_free(session);
|
|
|
|
session->max_r2t = value;
|
|
|
|
if (session->max_r2t & (session->max_r2t - 1))
|
|
|
|
session->max_r2t = roundup_pow_of_two(session->max_r2t);
|
|
|
|
if (iscsi_r2tpool_alloc(session))
|
|
|
|
return -ENOMEM;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_IMM_DATA_EN:
|
|
|
|
session->imm_data_en = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_FIRST_BURST:
|
|
|
|
session->first_burst = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_MAX_BURST:
|
|
|
|
session->max_burst = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_PDU_INORDER_EN:
|
|
|
|
session->pdu_inorder_en = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
|
|
|
session->dataseq_inorder_en = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_ERL:
|
|
|
|
session->erl = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_IFMARKER_EN:
|
|
|
|
BUG_ON(value);
|
|
|
|
session->ifmarker_en = value;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_OFMARKER_EN:
|
|
|
|
BUG_ON(value);
|
|
|
|
session->ofmarker_en = value;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_conn_get_param(iscsi_connh_t connh, enum iscsi_param param,
|
|
|
|
uint32_t *value)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = iscsi_ptr(connh);
|
|
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
|
|
|
|
switch(param) {
|
|
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
|
|
|
*value = conn->max_recv_dlength;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
|
|
|
*value = conn->max_xmit_dlength;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
|
|
*value = conn->hdrdgst_en;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
|
|
*value = conn->datadgst_en;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_INITIAL_R2T_EN:
|
|
|
|
*value = session->initial_r2t_en;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
|
|
*value = session->max_r2t;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_IMM_DATA_EN:
|
|
|
|
*value = session->imm_data_en;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_FIRST_BURST:
|
|
|
|
*value = session->first_burst;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_MAX_BURST:
|
|
|
|
*value = session->max_burst;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_PDU_INORDER_EN:
|
|
|
|
*value = session->pdu_inorder_en;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
|
|
|
*value = session->dataseq_inorder_en;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_ERL:
|
|
|
|
*value = session->erl;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_IFMARKER_EN:
|
|
|
|
*value = session->ifmarker_en;
|
|
|
|
break;
|
|
|
|
case ISCSI_PARAM_OFMARKER_EN:
|
|
|
|
*value = session->ofmarker_en;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return ISCSI_ERR_PARAM_NOT_FOUND;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = iscsi_ptr(connh);
|
|
|
|
|
|
|
|
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 = conn->sendpage_failures_cnt;
|
|
|
|
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
|
|
|
|
stats->custom[1].value = conn->discontiguous_hdr_cnt;
|
|
|
|
strcpy(stats->custom[2].desc, "eh_abort_cnt");
|
|
|
|
stats->custom[2].value = conn->eh_abort_cnt;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data,
|
|
|
|
uint32_t data_size)
|
|
|
|
{
|
|
|
|
struct iscsi_conn *conn = iscsi_ptr(connh);
|
|
|
|
int rc;
|
|
|
|
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_lock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
|
2006-01-11 12:16:10 +00:00
|
|
|
mutex_unlock(&conn->xmitmutex);
|
2005-08-05 02:30:08 +00:00
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct iscsi_transport iscsi_tcp_transport = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.name = "tcp",
|
|
|
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
|
|
|
|
| CAP_DATADGST,
|
|
|
|
.host_template = &iscsi_sht,
|
|
|
|
.hostdata_size = sizeof(struct iscsi_session),
|
|
|
|
.max_conn = 1,
|
|
|
|
.max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
|
|
|
|
.create_session = iscsi_session_create,
|
|
|
|
.destroy_session = iscsi_session_destroy,
|
|
|
|
.create_conn = iscsi_conn_create,
|
|
|
|
.bind_conn = iscsi_conn_bind,
|
|
|
|
.destroy_conn = iscsi_conn_destroy,
|
|
|
|
.set_param = iscsi_conn_set_param,
|
|
|
|
.get_param = iscsi_conn_get_param,
|
|
|
|
.start_conn = iscsi_conn_start,
|
|
|
|
.stop_conn = iscsi_conn_stop,
|
|
|
|
.send_pdu = iscsi_conn_send_pdu,
|
|
|
|
.get_stats = iscsi_conn_get_stats,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
iscsi_tcp_init(void)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
if (iscsi_max_lun < 1) {
|
|
|
|
printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
iscsi_tcp_transport.max_lun = iscsi_max_lun;
|
|
|
|
|
|
|
|
taskcache = kmem_cache_create("iscsi_taskcache",
|
|
|
|
sizeof(struct iscsi_data_task), 0,
|
|
|
|
SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL);
|
|
|
|
if (!taskcache)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
error = iscsi_register_transport(&iscsi_tcp_transport);
|
|
|
|
if (error)
|
|
|
|
kmem_cache_destroy(taskcache);
|
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
iscsi_tcp_exit(void)
|
|
|
|
{
|
|
|
|
iscsi_unregister_transport(&iscsi_tcp_transport);
|
|
|
|
kmem_cache_destroy(taskcache);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(iscsi_tcp_init);
|
|
|
|
module_exit(iscsi_tcp_exit);
|