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![Mike Christie](/assets/img/avatar_default.png)
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2560 lines
66 KiB
C
2560 lines
66 KiB
C
/*
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* iSCSI Initiator over TCP/IP Data-Path
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*
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* Copyright (C) 2004 Dmitry Yusupov
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* Copyright (C) 2004 Alex Aizman
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* Copyright (C) 2005 - 2006 Mike Christie
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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* maintained by open-iscsi@googlegroups.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* See the file COPYING included with this distribution for more details.
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*
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* Credits:
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* Christoph Hellwig
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* FUJITA Tomonori
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* Arne Redlich
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* Zhenyu Wang
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*/
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/inet.h>
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#include <linux/blkdev.h>
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#include <linux/crypto.h>
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#include <linux/delay.h>
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#include <linux/kfifo.h>
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#include <linux/scatterlist.h>
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#include <linux/mutex.h>
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#include <net/tcp.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_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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#define ISCSI_TCP_VERSION "1.0-595"
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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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MODULE_VERSION(ISCSI_TCP_VERSION);
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/* #define DEBUG_TCP */
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#define DEBUG_ASSERT
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#ifdef DEBUG_TCP
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#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
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#else
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#define debug_tcp(fmt...)
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#endif
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#ifndef DEBUG_ASSERT
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#ifdef BUG_ON
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#undef BUG_ON
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#endif
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#define BUG_ON(expr)
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#endif
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static unsigned int iscsi_max_lun = 512;
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module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
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static 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 = virt_to_page(vbuf);
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ibuf->sg.offset = offset_in_page(vbuf);
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ibuf->sg.length = size;
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ibuf->sent = 0;
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ibuf->use_sendmsg = 1;
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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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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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/*
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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 && !PageSlab(sg->page))
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ibuf->use_sendmsg = 0;
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else
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ibuf->use_sendmsg = 1;
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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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iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
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u8* crc)
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{
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
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crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc);
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buf->sg.length += sizeof(uint32_t);
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}
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static inline int
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iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn)
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{
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struct sk_buff *skb = tcp_conn->in.skb;
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tcp_conn->in.zero_copy_hdr = 0;
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if (tcp_conn->in.copy >= tcp_conn->hdr_size &&
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tcp_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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tcp_conn->in.hdr = (struct iscsi_hdr *)
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((char*)skb->data + tcp_conn->in.offset);
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tcp_conn->in.zero_copy_hdr = 1;
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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, tcp_conn->in.offset,
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&tcp_conn->hdr, tcp_conn->hdr_size);
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tcp_conn->in.hdr = &tcp_conn->hdr;
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}
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tcp_conn->in.offset += tcp_conn->hdr_size;
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tcp_conn->in.copy -= tcp_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 (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER)
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tcp_conn->in.hdr_offset = 0;
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hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset;
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BUG_ON(hdr_remains <= 0);
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copylen = min(tcp_conn->in.copy, hdr_remains);
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skb_copy_bits(skb, tcp_conn->in.offset,
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(char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset,
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copylen);
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debug_tcp("PDU gather offset %d bytes %d in.offset %d "
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"in.copy %d\n", tcp_conn->in.hdr_offset, copylen,
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tcp_conn->in.offset, tcp_conn->in.copy);
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tcp_conn->in.offset += copylen;
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tcp_conn->in.copy -= copylen;
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if (copylen < hdr_remains) {
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tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER;
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tcp_conn->in.hdr_offset += copylen;
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return -EAGAIN;
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}
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tcp_conn->in.hdr = &tcp_conn->hdr;
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tcp_conn->discontiguous_hdr_cnt++;
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tcp_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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/*
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* must be called with session lock
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*/
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static void
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__iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
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struct scsi_cmnd *sc;
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sc = ctask->sc;
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if (unlikely(!sc))
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return;
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tcp_ctask->xmstate = XMSTATE_IDLE;
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tcp_ctask->r2t = NULL;
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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_tcp_conn *tcp_conn = conn->dd_data;
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struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
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struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_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 = tcp_conn->in.datalen;
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if (tcp_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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tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
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if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length)
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return ISCSI_ERR_DATA_OFFSET;
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if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
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struct scsi_cmnd *sc = ctask->sc;
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conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
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if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
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int res_count = be32_to_cpu(rhdr->residual_count);
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if (res_count > 0 &&
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res_count <= sc->request_bufflen) {
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sc->resid = res_count;
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sc->result = (DID_OK << 16) | rhdr->cmd_status;
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} else
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sc->result = (DID_BAD_TARGET << 16) |
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rhdr->cmd_status;
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} else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
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sc->resid = be32_to_cpu(rhdr->residual_count);
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sc->result = (DID_OK << 16) | rhdr->cmd_status;
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} else
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sc->result = (DID_OK << 16) | rhdr->cmd_status;
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}
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conn->datain_pdus_cnt++;
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return 0;
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}
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/**
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* iscsi_solicit_data_init - initialize first Data-Out
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* @conn: iscsi connection
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* @ctask: scsi command task
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* @r2t: R2T info
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*
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* Notes:
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* Initialize first Data-Out within this R2T sequence and finds
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* proper data_offset within this SCSI command.
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*
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* This function is called with connection lock taken.
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**/
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static void
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iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
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struct iscsi_r2t_info *r2t)
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{
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struct iscsi_data *hdr;
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struct scsi_cmnd *sc = ctask->sc;
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struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
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hdr = &r2t->dtask.hdr;
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memset(hdr, 0, sizeof(struct iscsi_data));
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hdr->ttt = r2t->ttt;
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hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
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r2t->solicit_datasn++;
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hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
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memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
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hdr->itt = ctask->hdr->itt;
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hdr->exp_statsn = r2t->exp_statsn;
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hdr->offset = cpu_to_be32(r2t->data_offset);
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if (r2t->data_length > conn->max_xmit_dlength) {
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hton24(hdr->dlength, conn->max_xmit_dlength);
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r2t->data_count = conn->max_xmit_dlength;
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hdr->flags = 0;
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} else {
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hton24(hdr->dlength, r2t->data_length);
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r2t->data_count = r2t->data_length;
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hdr->flags = ISCSI_FLAG_CMD_FINAL;
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}
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conn->dataout_pdus_cnt++;
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r2t->sent = 0;
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iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
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sizeof(struct iscsi_hdr));
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if (sc->use_sg) {
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int i, sg_count = 0;
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struct scatterlist *sg = sc->request_buffer;
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r2t->sg = NULL;
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for (i = 0; i < sc->use_sg; i++, sg += 1) {
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/* FIXME: prefetch ? */
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if (sg_count + sg->length > r2t->data_offset) {
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int page_offset;
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/* sg page found! */
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/* offset within this page */
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page_offset = r2t->data_offset - sg_count;
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/* fill in this buffer */
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iscsi_buf_init_sg(&r2t->sendbuf, sg);
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r2t->sendbuf.sg.offset += page_offset;
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r2t->sendbuf.sg.length -= page_offset;
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/* xmit logic will continue with next one */
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r2t->sg = sg + 1;
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break;
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}
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sg_count += sg->length;
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}
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BUG_ON(r2t->sg == NULL);
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} else
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iscsi_buf_init_iov(&tcp_ctask->sendbuf,
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(char*)sc->request_buffer + r2t->data_offset,
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r2t->data_count);
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}
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/**
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* iscsi_r2t_rsp - iSCSI R2T 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_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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struct iscsi_r2t_info *r2t;
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struct iscsi_session *session = conn->session;
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struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
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struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
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int r2tsn = be32_to_cpu(rhdr->r2tsn);
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int rc;
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if (tcp_conn->in.datalen)
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return ISCSI_ERR_DATALEN;
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if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn)
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return ISCSI_ERR_R2TSN;
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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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/* FIXME: use R2TSN to detect missing R2T */
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/* fill-in new R2T associated with the task */
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spin_lock(&session->lock);
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if (!ctask->sc || ctask->mtask ||
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session->state != ISCSI_STATE_LOGGED_IN) {
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printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
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"recovery...\n", ctask->itt);
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spin_unlock(&session->lock);
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return 0;
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}
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rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
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BUG_ON(!rc);
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r2t->exp_statsn = rhdr->statsn;
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r2t->data_length = be32_to_cpu(rhdr->data_length);
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if (r2t->data_length == 0 ||
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r2t->data_length > session->max_burst) {
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spin_unlock(&session->lock);
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return ISCSI_ERR_DATALEN;
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}
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r2t->data_offset = be32_to_cpu(rhdr->data_offset);
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if (r2t->data_offset + r2t->data_length > ctask->total_length) {
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spin_unlock(&session->lock);
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return ISCSI_ERR_DATALEN;
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}
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r2t->ttt = rhdr->ttt; /* no flip */
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r2t->solicit_datasn = 0;
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iscsi_solicit_data_init(conn, ctask, r2t);
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tcp_ctask->exp_r2tsn = r2tsn + 1;
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tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
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__kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
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__kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
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scsi_queue_work(session->host, &conn->xmitwork);
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conn->r2t_pdus_cnt++;
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spin_unlock(&session->lock);
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return 0;
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}
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static int
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iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
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{
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int rc = 0, opcode, ahslen;
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struct iscsi_hdr *hdr;
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struct iscsi_session *session = conn->session;
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
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uint32_t cdgst, rdgst = 0, itt;
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hdr = tcp_conn->in.hdr;
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/* verify PDU length */
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tcp_conn->in.datalen = ntoh24(hdr->dlength);
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if (tcp_conn->in.datalen > conn->max_recv_dlength) {
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printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
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tcp_conn->in.datalen, conn->max_recv_dlength);
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return ISCSI_ERR_DATALEN;
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}
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tcp_conn->data_copied = 0;
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/* read AHS */
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ahslen = hdr->hlength << 2;
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tcp_conn->in.offset += ahslen;
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tcp_conn->in.copy -= ahslen;
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if (tcp_conn->in.copy < 0) {
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printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
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"%d bytes\n", ahslen);
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return ISCSI_ERR_AHSLEN;
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}
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|
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/* calculate read padding */
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tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
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if (tcp_conn->in.padding) {
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tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
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debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
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}
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if (conn->hdrdgst_en) {
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struct scatterlist sg;
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sg_init_one(&sg, (u8 *)hdr,
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sizeof(struct iscsi_hdr) + ahslen);
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crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
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rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
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ahslen);
|
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if (cdgst != rdgst) {
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printk(KERN_ERR "iscsi_tcp: hdrdgst error "
|
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"recv 0x%x calc 0x%x\n", rdgst, cdgst);
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return ISCSI_ERR_HDR_DGST;
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}
|
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}
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opcode = hdr->opcode & ISCSI_OPCODE_MASK;
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/* verify itt (itt encoding: age+cid+itt) */
|
|
rc = iscsi_verify_itt(conn, hdr, &itt);
|
|
if (rc == ISCSI_ERR_NO_SCSI_CMD) {
|
|
tcp_conn->in.datalen = 0; /* force drop */
|
|
return 0;
|
|
} else if (rc)
|
|
return rc;
|
|
|
|
debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
|
|
opcode, tcp_conn->in.offset, tcp_conn->in.copy,
|
|
ahslen, tcp_conn->in.datalen);
|
|
|
|
switch(opcode) {
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
tcp_conn->in.ctask = session->cmds[itt];
|
|
rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
|
|
/* fall through */
|
|
case ISCSI_OP_SCSI_CMD_RSP:
|
|
tcp_conn->in.ctask = session->cmds[itt];
|
|
if (tcp_conn->in.datalen)
|
|
goto copy_hdr;
|
|
|
|
spin_lock(&session->lock);
|
|
__iscsi_ctask_cleanup(conn, tcp_conn->in.ctask);
|
|
rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
|
|
spin_unlock(&session->lock);
|
|
break;
|
|
case ISCSI_OP_R2T:
|
|
tcp_conn->in.ctask = session->cmds[itt];
|
|
if (ahslen)
|
|
rc = ISCSI_ERR_AHSLEN;
|
|
else if (tcp_conn->in.ctask->sc->sc_data_direction ==
|
|
DMA_TO_DEVICE)
|
|
rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
|
|
else
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
case ISCSI_OP_TEXT_RSP:
|
|
case ISCSI_OP_LOGOUT_RSP:
|
|
case ISCSI_OP_NOOP_IN:
|
|
case ISCSI_OP_REJECT:
|
|
case ISCSI_OP_ASYNC_EVENT:
|
|
if (tcp_conn->in.datalen)
|
|
goto copy_hdr;
|
|
/* fall through */
|
|
case ISCSI_OP_SCSI_TMFUNC_RSP:
|
|
rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
|
|
break;
|
|
default:
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
|
|
copy_hdr:
|
|
/*
|
|
* if we did zero copy for the header but we will need multiple
|
|
* skbs to complete the command then we have to copy the header
|
|
* for later use
|
|
*/
|
|
if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <
|
|
(tcp_conn->in.datalen + tcp_conn->in.padding +
|
|
(conn->datadgst_en ? 4 : 0))) {
|
|
debug_tcp("Copying header for later use. in.copy %d in.datalen"
|
|
" %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
|
|
memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
|
|
sizeof(struct iscsi_hdr));
|
|
tcp_conn->in.hdr = &tcp_conn->hdr;
|
|
tcp_conn->in.zero_copy_hdr = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_ctask_copy - copy skb bits to the destanation cmd task
|
|
* @conn: iscsi tcp 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_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
|
|
void *buf, int buf_size, int offset)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
int buf_left = buf_size - (tcp_conn->data_copied + offset);
|
|
int size = min(tcp_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, tcp_conn->in.offset, tcp_conn->in.copied);
|
|
|
|
BUG_ON(size <= 0);
|
|
BUG_ON(tcp_ctask->sent + size > ctask->total_length);
|
|
|
|
rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
|
|
(char*)buf + (offset + tcp_conn->data_copied), size);
|
|
/* must fit into skb->len */
|
|
BUG_ON(rc);
|
|
|
|
tcp_conn->in.offset += size;
|
|
tcp_conn->in.copy -= size;
|
|
tcp_conn->in.copied += size;
|
|
tcp_conn->data_copied += size;
|
|
tcp_ctask->sent += size;
|
|
ctask->data_count -= size;
|
|
|
|
BUG_ON(tcp_conn->in.copy < 0);
|
|
BUG_ON(ctask->data_count < 0);
|
|
|
|
if (buf_size != (tcp_conn->data_copied + offset)) {
|
|
if (!ctask->data_count) {
|
|
BUG_ON(buf_size - tcp_conn->data_copied < 0);
|
|
/* done with this PDU */
|
|
return buf_size - tcp_conn->data_copied;
|
|
}
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* done with this buffer or with both - PDU and buffer */
|
|
tcp_conn->data_copied = 0;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_copy - copy skb bits to the destanation buffer
|
|
* @conn: iscsi tcp connection
|
|
*
|
|
* Notes:
|
|
* The function calls skb_copy_bits() and updates per-connection
|
|
* byte counters.
|
|
**/
|
|
static inline int
|
|
iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn)
|
|
{
|
|
void *buf = tcp_conn->data;
|
|
int buf_size = tcp_conn->in.datalen;
|
|
int buf_left = buf_size - tcp_conn->data_copied;
|
|
int size = min(tcp_conn->in.copy, buf_left);
|
|
int rc;
|
|
|
|
debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
|
|
size, tcp_conn->in.offset, tcp_conn->data_copied);
|
|
BUG_ON(size <= 0);
|
|
|
|
rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
|
|
(char*)buf + tcp_conn->data_copied, size);
|
|
BUG_ON(rc);
|
|
|
|
tcp_conn->in.offset += size;
|
|
tcp_conn->in.copy -= size;
|
|
tcp_conn->in.copied += size;
|
|
tcp_conn->data_copied += size;
|
|
|
|
if (buf_size != tcp_conn->data_copied)
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
partial_sg_digest_update(struct iscsi_tcp_conn *tcp_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(tcp_conn->data_rx_tfm, &temp, 1);
|
|
}
|
|
|
|
static void
|
|
iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
|
|
{
|
|
struct scatterlist tmp;
|
|
|
|
sg_init_one(&tmp, buf, len);
|
|
crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1);
|
|
}
|
|
|
|
static int iscsi_scsi_data_in(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
struct scatterlist *sg;
|
|
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(tcp_conn, ctask, sc->request_buffer,
|
|
sc->request_bufflen,
|
|
tcp_ctask->data_offset);
|
|
if (rc == -EAGAIN)
|
|
return rc;
|
|
if (conn->datadgst_en)
|
|
iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
|
|
i);
|
|
rc = 0;
|
|
goto done;
|
|
}
|
|
|
|
offset = tcp_ctask->data_offset;
|
|
sg = sc->request_buffer;
|
|
|
|
if (tcp_ctask->data_offset)
|
|
for (i = 0; i < tcp_ctask->sg_count; i++)
|
|
offset -= sg[i].length;
|
|
/* we've passed through partial sg*/
|
|
if (offset < 0)
|
|
offset = 0;
|
|
|
|
for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
|
|
char *dest;
|
|
|
|
dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
|
|
rc = iscsi_ctask_copy(tcp_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(
|
|
tcp_conn->data_rx_tfm,
|
|
&sg[i], 1);
|
|
else
|
|
partial_sg_digest_update(tcp_conn,
|
|
&sg[i],
|
|
sg[i].offset + offset,
|
|
sg[i].length - offset);
|
|
}
|
|
offset = 0;
|
|
tcp_ctask->sg_count++;
|
|
}
|
|
|
|
if (!ctask->data_count) {
|
|
if (rc && conn->datadgst_en)
|
|
/*
|
|
* data-in is complete, but buffer not...
|
|
*/
|
|
partial_sg_digest_update(tcp_conn, &sg[i],
|
|
sg[i].offset, sg[i].length-rc);
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
if (!tcp_conn->in.copy)
|
|
return -EAGAIN;
|
|
}
|
|
BUG_ON(ctask->data_count);
|
|
|
|
done:
|
|
/* check for non-exceptional status */
|
|
if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
|
|
debug_scsi("done [sc %lx res %d itt 0x%x]\n",
|
|
(long)sc, sc->result, ctask->itt);
|
|
spin_lock(&conn->session->lock);
|
|
__iscsi_ctask_cleanup(conn, ctask);
|
|
__iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
|
|
spin_unlock(&conn->session->lock);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
iscsi_data_recv(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
int rc = 0, opcode;
|
|
|
|
opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
|
|
switch (opcode) {
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
rc = iscsi_scsi_data_in(conn);
|
|
break;
|
|
case ISCSI_OP_SCSI_CMD_RSP:
|
|
spin_lock(&conn->session->lock);
|
|
__iscsi_ctask_cleanup(conn, tcp_conn->in.ctask);
|
|
spin_unlock(&conn->session->lock);
|
|
case ISCSI_OP_TEXT_RSP:
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
case ISCSI_OP_NOOP_IN:
|
|
case ISCSI_OP_ASYNC_EVENT:
|
|
case ISCSI_OP_REJECT:
|
|
/*
|
|
* Collect data segment to the connection's data
|
|
* placeholder
|
|
*/
|
|
if (iscsi_tcp_copy(tcp_conn)) {
|
|
rc = -EAGAIN;
|
|
goto exit;
|
|
}
|
|
|
|
rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data,
|
|
tcp_conn->in.datalen);
|
|
if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
|
|
iscsi_recv_digest_update(tcp_conn, tcp_conn->data,
|
|
tcp_conn->in.datalen);
|
|
break;
|
|
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;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
int processed;
|
|
char pad[ISCSI_PAD_LEN];
|
|
struct scatterlist sg;
|
|
|
|
/*
|
|
* Save current SKB and its offset in the corresponding
|
|
* connection context.
|
|
*/
|
|
tcp_conn->in.copy = skb->len - offset;
|
|
tcp_conn->in.offset = offset;
|
|
tcp_conn->in.skb = skb;
|
|
tcp_conn->in.len = tcp_conn->in.copy;
|
|
BUG_ON(tcp_conn->in.copy <= 0);
|
|
debug_tcp("in %d bytes\n", tcp_conn->in.copy);
|
|
|
|
more:
|
|
tcp_conn->in.copied = 0;
|
|
rc = 0;
|
|
|
|
if (unlikely(conn->suspend_rx)) {
|
|
debug_tcp("conn %d Rx suspended!\n", conn->id);
|
|
return 0;
|
|
}
|
|
|
|
if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
|
|
tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
|
|
rc = iscsi_hdr_extract(tcp_conn);
|
|
if (rc) {
|
|
if (rc == -EAGAIN)
|
|
goto nomore;
|
|
else {
|
|
iscsi_conn_failure(conn, rc);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Verify and process incoming PDU header.
|
|
*/
|
|
rc = iscsi_tcp_hdr_recv(conn);
|
|
if (!rc && tcp_conn->in.datalen) {
|
|
if (conn->datadgst_en) {
|
|
BUG_ON(!tcp_conn->data_rx_tfm);
|
|
crypto_digest_init(tcp_conn->data_rx_tfm);
|
|
}
|
|
tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
|
|
} else if (rc) {
|
|
iscsi_conn_failure(conn, rc);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
|
|
uint32_t recv_digest;
|
|
|
|
debug_tcp("extra data_recv offset %d copy %d\n",
|
|
tcp_conn->in.offset, tcp_conn->in.copy);
|
|
skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
|
|
&recv_digest, 4);
|
|
tcp_conn->in.offset += 4;
|
|
tcp_conn->in.copy -= 4;
|
|
if (recv_digest != tcp_conn->in.datadgst) {
|
|
debug_tcp("iscsi_tcp: data digest error!"
|
|
"0x%x != 0x%x\n", recv_digest,
|
|
tcp_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,
|
|
tcp_conn->in.datadgst);
|
|
tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
|
}
|
|
}
|
|
|
|
if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
|
|
tcp_conn->in.copy) {
|
|
|
|
debug_tcp("data_recv offset %d copy %d\n",
|
|
tcp_conn->in.offset, tcp_conn->in.copy);
|
|
|
|
rc = iscsi_data_recv(conn);
|
|
if (rc) {
|
|
if (rc == -EAGAIN)
|
|
goto again;
|
|
iscsi_conn_failure(conn, rc);
|
|
return 0;
|
|
}
|
|
tcp_conn->in.copy -= tcp_conn->in.padding;
|
|
tcp_conn->in.offset += tcp_conn->in.padding;
|
|
if (conn->datadgst_en) {
|
|
if (tcp_conn->in.padding) {
|
|
debug_tcp("padding -> %d\n",
|
|
tcp_conn->in.padding);
|
|
memset(pad, 0, tcp_conn->in.padding);
|
|
sg_init_one(&sg, pad, tcp_conn->in.padding);
|
|
crypto_digest_update(tcp_conn->data_rx_tfm,
|
|
&sg, 1);
|
|
}
|
|
crypto_digest_final(tcp_conn->data_rx_tfm,
|
|
(u8 *) & tcp_conn->in.datadgst);
|
|
debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
|
|
tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
|
|
} else
|
|
tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
|
}
|
|
|
|
debug_tcp("f, processed %d from out of %d padding %d\n",
|
|
tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
|
|
BUG_ON(tcp_conn->in.offset - offset > len);
|
|
|
|
if (tcp_conn->in.offset - offset != len) {
|
|
debug_tcp("continue to process %d bytes\n",
|
|
(int)len - (tcp_conn->in.offset - offset));
|
|
goto more;
|
|
}
|
|
|
|
nomore:
|
|
processed = tcp_conn->in.offset - offset;
|
|
BUG_ON(processed == 0);
|
|
return processed;
|
|
|
|
again:
|
|
processed = tcp_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.
|
|
* We set count to 1 because we want the network layer to
|
|
* hand us all the skbs that are available. iscsi_tcp_data_recv
|
|
* handled pdus that cross buffers or pdus that still need data.
|
|
*/
|
|
rd_desc.arg.data = conn;
|
|
rd_desc.count = 1;
|
|
tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
|
|
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_state_change(struct sock *sk)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_session *session;
|
|
void (*old_state_change)(struct sock *);
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
|
|
conn = (struct iscsi_conn*)sk->sk_user_data;
|
|
session = conn->session;
|
|
|
|
if ((sk->sk_state == TCP_CLOSE_WAIT ||
|
|
sk->sk_state == TCP_CLOSE) &&
|
|
!atomic_read(&sk->sk_rmem_alloc)) {
|
|
debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
}
|
|
|
|
tcp_conn = conn->dd_data;
|
|
old_state_change = tcp_conn->old_state_change;
|
|
|
|
read_unlock(&sk->sk_callback_lock);
|
|
|
|
old_state_change(sk);
|
|
}
|
|
|
|
/**
|
|
* iscsi_write_space - Called when more output buffer space is available
|
|
* @sk: socket space is available for
|
|
**/
|
|
static void
|
|
iscsi_write_space(struct sock *sk)
|
|
{
|
|
struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
|
|
tcp_conn->old_write_space(sk);
|
|
debug_tcp("iscsi_write_space: cid %d\n", conn->id);
|
|
scsi_queue_work(conn->session->host, &conn->xmitwork);
|
|
}
|
|
|
|
static void
|
|
iscsi_conn_set_callbacks(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct sock *sk = tcp_conn->sock->sk;
|
|
|
|
/* assign new callbacks */
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sk->sk_user_data = conn;
|
|
tcp_conn->old_data_ready = sk->sk_data_ready;
|
|
tcp_conn->old_state_change = sk->sk_state_change;
|
|
tcp_conn->old_write_space = sk->sk_write_space;
|
|
sk->sk_data_ready = iscsi_tcp_data_ready;
|
|
sk->sk_state_change = iscsi_tcp_state_change;
|
|
sk->sk_write_space = iscsi_write_space;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void
|
|
iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct sock *sk = tcp_conn->sock->sk;
|
|
|
|
/* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sk->sk_user_data = NULL;
|
|
sk->sk_data_ready = tcp_conn->old_data_ready;
|
|
sk->sk_state_change = tcp_conn->old_state_change;
|
|
sk->sk_write_space = tcp_conn->old_write_space;
|
|
sk->sk_no_check = 0;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* iscsi_send - generic send routine
|
|
* @sk: kernel's socket
|
|
* @buf: buffer to write from
|
|
* @size: actual size to write
|
|
* @flags: socket's flags
|
|
*/
|
|
static inline int
|
|
iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct socket *sk = tcp_conn->sock;
|
|
int offset = buf->sg.offset + buf->sent, res;
|
|
|
|
/*
|
|
* if we got use_sg=0 or are sending something we kmallocd
|
|
* then we did not have to do kmap (kmap returns page_address)
|
|
*
|
|
* if we got use_sg > 0, but had to drop down, we do not
|
|
* set clustering so this should only happen for that
|
|
* slab case.
|
|
*/
|
|
if (buf->use_sendmsg)
|
|
res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
|
|
else
|
|
res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
|
|
|
|
if (res >= 0) {
|
|
conn->txdata_octets += res;
|
|
buf->sent += res;
|
|
return res;
|
|
}
|
|
|
|
tcp_conn->sendpage_failures_cnt++;
|
|
if (res == -EAGAIN)
|
|
res = -ENOBUFS;
|
|
else
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
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)
|
|
{
|
|
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(conn, buf, size, flags);
|
|
debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
|
|
if (res >= 0) {
|
|
if (size != res)
|
|
return -EAGAIN;
|
|
return 0;
|
|
}
|
|
|
|
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)
|
|
{
|
|
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;
|
|
if (buf->sent + size != buf->sg.length || *count != size)
|
|
flags |= MSG_MORE;
|
|
|
|
res = iscsi_send(conn, 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) {
|
|
*count -= res;
|
|
*sent += res;
|
|
if (size != res)
|
|
return -EAGAIN;
|
|
return 0;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static inline void
|
|
iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
|
|
struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
BUG_ON(!tcp_conn->data_tx_tfm);
|
|
crypto_digest_init(tcp_conn->data_tx_tfm);
|
|
tcp_ctask->digest_count = 4;
|
|
}
|
|
|
|
static int
|
|
iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
struct iscsi_buf *buf, uint32_t *digest, int final)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
int rc = 0;
|
|
int sent = 0;
|
|
|
|
if (final)
|
|
crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest);
|
|
|
|
iscsi_buf_init_iov(buf, (char*)digest, 4);
|
|
rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
|
|
if (rc) {
|
|
tcp_ctask->datadigest = *digest;
|
|
tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST;
|
|
} else
|
|
tcp_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_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_data *hdr;
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
int new_offset;
|
|
|
|
hdr = &r2t->dtask.hdr;
|
|
memset(hdr, 0, sizeof(struct iscsi_data));
|
|
hdr->ttt = r2t->ttt;
|
|
hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
|
|
r2t->solicit_datasn++;
|
|
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
|
|
memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
|
|
hdr->itt = ctask->hdr->itt;
|
|
hdr->exp_statsn = r2t->exp_statsn;
|
|
new_offset = r2t->data_offset + r2t->sent;
|
|
hdr->offset = cpu_to_be32(new_offset);
|
|
if (left > conn->max_xmit_dlength) {
|
|
hton24(hdr->dlength, conn->max_xmit_dlength);
|
|
r2t->data_count = conn->max_xmit_dlength;
|
|
} else {
|
|
hton24(hdr->dlength, left);
|
|
r2t->data_count = left;
|
|
hdr->flags = ISCSI_FLAG_CMD_FINAL;
|
|
}
|
|
conn->dataout_pdus_cnt++;
|
|
|
|
iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
|
|
sizeof(struct iscsi_hdr));
|
|
|
|
if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
|
|
BUG_ON(tcp_ctask->bad_sg == r2t->sg);
|
|
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
|
|
r2t->sg += 1;
|
|
} else
|
|
iscsi_buf_init_iov(&tcp_ctask->sendbuf,
|
|
(char*)sc->request_buffer + new_offset,
|
|
r2t->data_count);
|
|
}
|
|
|
|
static void
|
|
iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_data_task *dtask;
|
|
|
|
dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask;
|
|
iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr,
|
|
tcp_ctask->r2t_data_count);
|
|
iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
|
|
sizeof(struct iscsi_hdr));
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
|
|
* @conn: iscsi connection
|
|
* @ctask: scsi command task
|
|
* @sc: scsi command
|
|
**/
|
|
static void
|
|
iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
|
|
|
|
tcp_ctask->sent = 0;
|
|
tcp_ctask->sg_count = 0;
|
|
|
|
if (sc->sc_data_direction == DMA_TO_DEVICE) {
|
|
tcp_ctask->xmstate = XMSTATE_W_HDR;
|
|
tcp_ctask->exp_r2tsn = 0;
|
|
BUG_ON(ctask->total_length == 0);
|
|
|
|
if (sc->use_sg) {
|
|
struct scatterlist *sg = sc->request_buffer;
|
|
|
|
iscsi_buf_init_sg(&tcp_ctask->sendbuf,
|
|
&sg[tcp_ctask->sg_count++]);
|
|
tcp_ctask->sg = sg;
|
|
tcp_ctask->bad_sg = sg + sc->use_sg;
|
|
} else
|
|
iscsi_buf_init_iov(&tcp_ctask->sendbuf,
|
|
sc->request_buffer,
|
|
sc->request_bufflen);
|
|
|
|
if (ctask->imm_count)
|
|
tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
|
|
|
|
tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
|
|
if (tcp_ctask->pad_count) {
|
|
tcp_ctask->pad_count = ISCSI_PAD_LEN -
|
|
tcp_ctask->pad_count;
|
|
debug_scsi("write padding %d bytes\n",
|
|
tcp_ctask->pad_count);
|
|
tcp_ctask->xmstate |= XMSTATE_W_PAD;
|
|
}
|
|
|
|
if (ctask->unsol_count)
|
|
tcp_ctask->xmstate |= XMSTATE_UNS_HDR |
|
|
XMSTATE_UNS_INIT;
|
|
tcp_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, tcp_ctask->r2t_data_count);
|
|
} else
|
|
tcp_ctask->xmstate = XMSTATE_R_HDR;
|
|
|
|
iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
|
|
sizeof(struct iscsi_hdr));
|
|
}
|
|
|
|
/**
|
|
* iscsi_tcp_mtask_xmit - xmit management(immediate) task
|
|
* @conn: iscsi connection
|
|
* @mtask: task management task
|
|
*
|
|
* Notes:
|
|
* The function can return -EAGAIN in which case caller must
|
|
* call it again later, or recover. '0' return code means successful
|
|
* xmit.
|
|
*
|
|
* 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_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
|
|
{
|
|
struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
|
|
int rc;
|
|
|
|
debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
|
|
conn->id, tcp_mtask->xmstate, mtask->itt);
|
|
|
|
if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
|
|
tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
|
|
if (mtask->data_count)
|
|
tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
|
|
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
|
|
conn->stop_stage != STOP_CONN_RECOVER &&
|
|
conn->hdrdgst_en)
|
|
iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
|
|
(u8*)tcp_mtask->hdrext);
|
|
rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
|
|
mtask->data_count);
|
|
if (rc) {
|
|
tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
|
|
if (mtask->data_count)
|
|
tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
|
|
BUG_ON(!mtask->data_count);
|
|
tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
|
|
/* FIXME: implement.
|
|
* Virtual buffer could be spreaded across multiple pages...
|
|
*/
|
|
do {
|
|
int rc;
|
|
|
|
rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
|
|
&mtask->data_count, &tcp_mtask->sent);
|
|
if (rc) {
|
|
tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
|
|
return rc;
|
|
}
|
|
} while (mtask->data_count);
|
|
}
|
|
|
|
BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
|
|
if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
spin_lock_bh(&session->lock);
|
|
list_del(&conn->mtask->running);
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
|
|
sizeof(void*));
|
|
spin_unlock_bh(&session->lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
handle_xmstate_r_hdr(struct iscsi_conn *conn,
|
|
struct iscsi_tcp_cmd_task *tcp_ctask)
|
|
{
|
|
int rc;
|
|
|
|
tcp_ctask->xmstate &= ~XMSTATE_R_HDR;
|
|
if (conn->hdrdgst_en)
|
|
iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
|
|
(u8*)tcp_ctask->hdrext);
|
|
rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0);
|
|
if (!rc) {
|
|
BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
|
|
return 0; /* wait for Data-In */
|
|
}
|
|
tcp_ctask->xmstate |= XMSTATE_R_HDR;
|
|
return rc;
|
|
}
|
|
|
|
static inline int
|
|
handle_xmstate_w_hdr(struct iscsi_conn *conn,
|
|
struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
int rc;
|
|
|
|
tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
|
|
if (conn->hdrdgst_en)
|
|
iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
|
|
(u8*)tcp_ctask->hdrext);
|
|
rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
|
|
if (rc)
|
|
tcp_ctask->xmstate |= XMSTATE_W_HDR;
|
|
return rc;
|
|
}
|
|
|
|
static inline int
|
|
handle_xmstate_data_digest(struct iscsi_conn *conn,
|
|
struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
int rc;
|
|
|
|
tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
|
|
debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest);
|
|
rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf,
|
|
&tcp_ctask->datadigest, 0);
|
|
if (rc) {
|
|
tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST;
|
|
debug_tcp("resent data digest 0x%x fail!\n",
|
|
tcp_ctask->datadigest);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static inline int
|
|
handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
int rc;
|
|
|
|
BUG_ON(!ctask->imm_count);
|
|
tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
|
|
|
|
if (conn->datadgst_en) {
|
|
iscsi_data_digest_init(tcp_conn, ctask);
|
|
tcp_ctask->immdigest = 0;
|
|
}
|
|
|
|
for (;;) {
|
|
rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf,
|
|
&ctask->imm_count, &tcp_ctask->sent);
|
|
if (rc) {
|
|
tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
|
|
if (conn->datadgst_en) {
|
|
crypto_digest_final(tcp_conn->data_tx_tfm,
|
|
(u8*)&tcp_ctask->immdigest);
|
|
debug_tcp("tx imm sendpage fail 0x%x\n",
|
|
tcp_ctask->datadigest);
|
|
}
|
|
return rc;
|
|
}
|
|
if (conn->datadgst_en)
|
|
crypto_digest_update(tcp_conn->data_tx_tfm,
|
|
&tcp_ctask->sendbuf.sg, 1);
|
|
|
|
if (!ctask->imm_count)
|
|
break;
|
|
iscsi_buf_init_sg(&tcp_ctask->sendbuf,
|
|
&tcp_ctask->sg[tcp_ctask->sg_count++]);
|
|
}
|
|
|
|
if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) {
|
|
rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf,
|
|
&tcp_ctask->immdigest, 1);
|
|
if (rc) {
|
|
debug_tcp("sending imm digest 0x%x fail!\n",
|
|
tcp_ctask->immdigest);
|
|
return rc;
|
|
}
|
|
debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_data_task *dtask;
|
|
int rc;
|
|
|
|
tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
|
|
if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
|
|
iscsi_unsolicit_data_init(conn, ctask);
|
|
dtask = tcp_ctask->dtask;
|
|
if (conn->hdrdgst_en)
|
|
iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
|
|
(u8*)dtask->hdrext);
|
|
tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
|
|
}
|
|
|
|
rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
|
|
if (rc) {
|
|
tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
|
|
tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
|
|
return rc;
|
|
}
|
|
|
|
debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
|
|
ctask->itt, ctask->unsol_count, tcp_ctask->sent);
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_data_task *dtask = tcp_ctask->dtask;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
int rc;
|
|
|
|
BUG_ON(!ctask->data_count);
|
|
tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
|
|
|
|
if (conn->datadgst_en) {
|
|
iscsi_data_digest_init(tcp_conn, ctask);
|
|
dtask->digest = 0;
|
|
}
|
|
|
|
for (;;) {
|
|
int start = tcp_ctask->sent;
|
|
|
|
rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf,
|
|
&ctask->data_count, &tcp_ctask->sent);
|
|
if (rc) {
|
|
ctask->unsol_count -= tcp_ctask->sent - start;
|
|
tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
|
|
/* will continue with this ctask later.. */
|
|
if (conn->datadgst_en) {
|
|
crypto_digest_final(tcp_conn->data_tx_tfm,
|
|
(u8 *)&dtask->digest);
|
|
debug_tcp("tx uns data fail 0x%x\n",
|
|
dtask->digest);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
BUG_ON(tcp_ctask->sent > ctask->total_length);
|
|
ctask->unsol_count -= tcp_ctask->sent - start;
|
|
|
|
/*
|
|
* XXX:we may run here with un-initial sendbuf.
|
|
* so pass it
|
|
*/
|
|
if (conn->datadgst_en && tcp_ctask->sent - start > 0)
|
|
crypto_digest_update(tcp_conn->data_tx_tfm,
|
|
&tcp_ctask->sendbuf.sg, 1);
|
|
|
|
if (!ctask->data_count)
|
|
break;
|
|
iscsi_buf_init_sg(&tcp_ctask->sendbuf,
|
|
&tcp_ctask->sg[tcp_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) {
|
|
rc = iscsi_digest_final_send(conn, ctask,
|
|
&dtask->digestbuf,
|
|
&dtask->digest, 1);
|
|
if (rc) {
|
|
debug_tcp("send uns digest 0x%x fail\n",
|
|
dtask->digest);
|
|
return rc;
|
|
}
|
|
debug_tcp("sending uns digest 0x%x, more uns\n",
|
|
dtask->digest);
|
|
}
|
|
tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
|
|
return 1;
|
|
}
|
|
|
|
if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) {
|
|
rc = iscsi_digest_final_send(conn, ctask,
|
|
&dtask->digestbuf,
|
|
&dtask->digest, 1);
|
|
if (rc) {
|
|
debug_tcp("send last uns digest 0x%x fail\n",
|
|
dtask->digest);
|
|
return rc;
|
|
}
|
|
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_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_r2t_info *r2t = tcp_ctask->r2t;
|
|
struct iscsi_data_task *dtask = &r2t->dtask;
|
|
int left, rc;
|
|
|
|
tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
|
|
tcp_ctask->dtask = dtask;
|
|
|
|
if (conn->datadgst_en) {
|
|
iscsi_data_digest_init(tcp_conn, ctask);
|
|
dtask->digest = 0;
|
|
}
|
|
solicit_again:
|
|
/*
|
|
* send Data-Out whitnin this R2T sequence.
|
|
*/
|
|
if (!r2t->data_count)
|
|
goto data_out_done;
|
|
|
|
rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent);
|
|
if (rc) {
|
|
tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
/* will continue with this ctask later.. */
|
|
if (conn->datadgst_en) {
|
|
crypto_digest_final(tcp_conn->data_tx_tfm,
|
|
(u8 *)&dtask->digest);
|
|
debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
BUG_ON(r2t->data_count < 0);
|
|
if (conn->datadgst_en)
|
|
crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg,
|
|
1);
|
|
|
|
if (r2t->data_count) {
|
|
BUG_ON(ctask->sc->use_sg == 0);
|
|
if (!iscsi_buf_left(&r2t->sendbuf)) {
|
|
BUG_ON(tcp_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) {
|
|
rc = iscsi_digest_final_send(conn, ctask,
|
|
&dtask->digestbuf,
|
|
&dtask->digest, 1);
|
|
if (rc) {
|
|
debug_tcp("send r2t data digest 0x%x"
|
|
"fail\n", dtask->digest);
|
|
return rc;
|
|
}
|
|
debug_tcp("r2t data send digest 0x%x\n",
|
|
dtask->digest);
|
|
}
|
|
iscsi_solicit_data_cont(conn, ctask, r2t, left);
|
|
tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Done with this R2T. Check if there are more
|
|
* outstanding R2Ts ready to be processed.
|
|
*/
|
|
BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0);
|
|
if (conn->datadgst_en) {
|
|
rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
|
|
&dtask->digest, 1);
|
|
if (rc) {
|
|
debug_tcp("send last r2t data digest 0x%x"
|
|
"fail\n", dtask->digest);
|
|
return rc;
|
|
}
|
|
debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
|
|
}
|
|
|
|
tcp_ctask->r2t_data_count -= r2t->data_length;
|
|
tcp_ctask->r2t = NULL;
|
|
spin_lock_bh(&session->lock);
|
|
__kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
|
|
spin_unlock_bh(&session->lock);
|
|
if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
|
|
tcp_ctask->r2t = r2t;
|
|
tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
tcp_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_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct iscsi_data_task *dtask = tcp_ctask->dtask;
|
|
int sent, rc;
|
|
|
|
tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
|
|
iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
|
|
tcp_ctask->pad_count);
|
|
rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
|
|
&sent);
|
|
if (rc) {
|
|
tcp_ctask->xmstate |= XMSTATE_W_PAD;
|
|
return rc;
|
|
}
|
|
|
|
if (conn->datadgst_en) {
|
|
crypto_digest_update(tcp_conn->data_tx_tfm,
|
|
&tcp_ctask->sendbuf.sg, 1);
|
|
/* imm data? */
|
|
if (!dtask) {
|
|
rc = iscsi_digest_final_send(conn, ctask,
|
|
&tcp_ctask->immbuf,
|
|
&tcp_ctask->immdigest, 1);
|
|
if (rc) {
|
|
debug_tcp("send padding digest 0x%x"
|
|
"fail!\n", tcp_ctask->immdigest);
|
|
return rc;
|
|
}
|
|
debug_tcp("done with padding, digest 0x%x\n",
|
|
tcp_ctask->datadigest);
|
|
} else {
|
|
rc = iscsi_digest_final_send(conn, ctask,
|
|
&dtask->digestbuf,
|
|
&dtask->digest, 1);
|
|
if (rc) {
|
|
debug_tcp("send padding digest 0x%x"
|
|
"fail\n", dtask->digest);
|
|
return rc;
|
|
}
|
|
debug_tcp("done with padding, digest 0x%x\n",
|
|
dtask->digest);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
int rc = 0;
|
|
|
|
debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
|
|
conn->id, tcp_ctask->xmstate, ctask->itt);
|
|
|
|
/*
|
|
* serialize with TMF AbortTask
|
|
*/
|
|
if (ctask->mtask)
|
|
return rc;
|
|
|
|
if (tcp_ctask->xmstate & XMSTATE_R_HDR)
|
|
return handle_xmstate_r_hdr(conn, tcp_ctask);
|
|
|
|
if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
|
|
rc = handle_xmstate_w_hdr(conn, ctask);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
/* XXX: for data digest xmit recover */
|
|
if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) {
|
|
rc = handle_xmstate_data_digest(conn, ctask);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
|
|
rc = handle_xmstate_imm_data(conn, ctask);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
|
|
BUG_ON(!ctask->unsol_count);
|
|
tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
|
|
unsolicit_head_again:
|
|
rc = handle_xmstate_uns_hdr(conn, ctask);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
if (tcp_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 (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
|
|
struct iscsi_r2t_info *r2t;
|
|
|
|
tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
|
|
tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
|
|
if (!tcp_ctask->r2t)
|
|
__kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
|
|
sizeof(void*));
|
|
solicit_head_again:
|
|
r2t = tcp_ctask->r2t;
|
|
if (conn->hdrdgst_en)
|
|
iscsi_hdr_digest(conn, &r2t->headbuf,
|
|
(u8*)r2t->dtask.hdrext);
|
|
rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
|
|
if (rc) {
|
|
tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
|
|
tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
|
|
return rc;
|
|
}
|
|
|
|
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 (tcp_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 (tcp_ctask->xmstate == XMSTATE_W_PAD)
|
|
rc = handle_xmstate_w_pad(conn, ctask);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct iscsi_cls_conn *
|
|
iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
|
|
{
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_cls_conn *cls_conn;
|
|
struct iscsi_tcp_conn *tcp_conn;
|
|
|
|
cls_conn = iscsi_conn_setup(cls_session, conn_idx);
|
|
if (!cls_conn)
|
|
return NULL;
|
|
conn = cls_conn->dd_data;
|
|
/*
|
|
* due to strange issues with iser these are not set
|
|
* in iscsi_conn_setup
|
|
*/
|
|
conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
|
|
|
|
tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
|
|
if (!tcp_conn)
|
|
goto tcp_conn_alloc_fail;
|
|
|
|
conn->dd_data = tcp_conn;
|
|
tcp_conn->iscsi_conn = conn;
|
|
tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
|
/* initial operational parameters */
|
|
tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
|
|
tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
|
|
|
|
/* allocate initial PDU receive place holder */
|
|
if (tcp_conn->data_size <= PAGE_SIZE)
|
|
tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL);
|
|
else
|
|
tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL,
|
|
get_order(tcp_conn->data_size));
|
|
if (!tcp_conn->data)
|
|
goto max_recv_dlenght_alloc_fail;
|
|
|
|
return cls_conn;
|
|
|
|
max_recv_dlenght_alloc_fail:
|
|
kfree(tcp_conn);
|
|
tcp_conn_alloc_fail:
|
|
iscsi_conn_teardown(cls_conn);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
int digest = 0;
|
|
|
|
if (conn->hdrdgst_en || conn->datadgst_en)
|
|
digest = 1;
|
|
|
|
iscsi_conn_teardown(cls_conn);
|
|
|
|
/* now free tcp_conn */
|
|
if (digest) {
|
|
if (tcp_conn->tx_tfm)
|
|
crypto_free_tfm(tcp_conn->tx_tfm);
|
|
if (tcp_conn->rx_tfm)
|
|
crypto_free_tfm(tcp_conn->rx_tfm);
|
|
if (tcp_conn->data_tx_tfm)
|
|
crypto_free_tfm(tcp_conn->data_tx_tfm);
|
|
if (tcp_conn->data_rx_tfm)
|
|
crypto_free_tfm(tcp_conn->data_rx_tfm);
|
|
}
|
|
|
|
/* free conn->data, size = MaxRecvDataSegmentLength */
|
|
if (tcp_conn->data_size <= PAGE_SIZE)
|
|
kfree(tcp_conn->data);
|
|
else
|
|
free_pages((unsigned long)tcp_conn->data,
|
|
get_order(tcp_conn->data_size));
|
|
kfree(tcp_conn);
|
|
}
|
|
|
|
static int
|
|
iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
|
|
struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
|
|
int is_leading)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct sock *sk;
|
|
struct socket *sock;
|
|
int err;
|
|
|
|
/* lookup for existing socket */
|
|
sock = sockfd_lookup((int)transport_eph, &err);
|
|
if (!sock) {
|
|
printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
|
|
return -EEXIST;
|
|
}
|
|
|
|
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
|
|
if (err)
|
|
return err;
|
|
|
|
/* bind iSCSI connection and socket */
|
|
tcp_conn->sock = sock;
|
|
|
|
/* setup Socket parameters */
|
|
sk = sock->sk;
|
|
sk->sk_reuse = 1;
|
|
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
|
|
sk->sk_allocation = GFP_ATOMIC;
|
|
|
|
/* FIXME: disable Nagle's algorithm */
|
|
|
|
/*
|
|
* Intercept TCP callbacks for sendfile like receive
|
|
* processing.
|
|
*/
|
|
conn->recv_lock = &sk->sk_callback_lock;
|
|
iscsi_conn_set_callbacks(conn);
|
|
tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
|
|
/*
|
|
* set receive state machine into initial state
|
|
*/
|
|
tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
struct iscsi_r2t_info *r2t;
|
|
|
|
/* flush ctask's r2t queues */
|
|
while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)))
|
|
__kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
|
|
sizeof(void*));
|
|
|
|
__iscsi_ctask_cleanup(conn, ctask);
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct sock *sk;
|
|
|
|
if (!tcp_conn->sock)
|
|
return;
|
|
|
|
sk = tcp_conn->sock->sk;
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void
|
|
iscsi_tcp_terminate_conn(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
|
|
if (!tcp_conn->sock)
|
|
return;
|
|
|
|
sock_hold(tcp_conn->sock->sk);
|
|
iscsi_conn_restore_callbacks(conn);
|
|
sock_put(tcp_conn->sock->sk);
|
|
|
|
sock_release(tcp_conn->sock);
|
|
tcp_conn->sock = NULL;
|
|
conn->recv_lock = NULL;
|
|
}
|
|
|
|
/* called with host lock */
|
|
static void
|
|
iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
|
|
char *data, uint32_t data_size)
|
|
{
|
|
struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
|
|
|
|
iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
|
|
sizeof(struct iscsi_hdr));
|
|
tcp_mtask->xmstate = XMSTATE_IMM_HDR;
|
|
|
|
if (mtask->data_count)
|
|
iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
|
|
mtask->data_count);
|
|
}
|
|
|
|
static int
|
|
iscsi_r2tpool_alloc(struct iscsi_session *session)
|
|
{
|
|
int i;
|
|
int cmd_i;
|
|
|
|
/*
|
|
* initialize per-task: R2T pool and xmit queue
|
|
*/
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
/*
|
|
* pre-allocated x4 as much r2ts to handle race when
|
|
* target acks DataOut faster than we data_xmit() queues
|
|
* could replenish r2tqueue.
|
|
*/
|
|
|
|
/* R2T pool */
|
|
if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
|
|
(void***)&tcp_ctask->r2ts,
|
|
sizeof(struct iscsi_r2t_info))) {
|
|
goto r2t_alloc_fail;
|
|
}
|
|
|
|
/* R2T xmit queue */
|
|
tcp_ctask->r2tqueue = kfifo_alloc(
|
|
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
|
|
if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
|
|
iscsi_pool_free(&tcp_ctask->r2tpool,
|
|
(void**)tcp_ctask->r2ts);
|
|
goto r2t_alloc_fail;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
r2t_alloc_fail:
|
|
for (i = 0; i < cmd_i; i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
kfifo_free(tcp_ctask->r2tqueue);
|
|
iscsi_pool_free(&tcp_ctask->r2tpool,
|
|
(void**)tcp_ctask->r2ts);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void
|
|
iscsi_r2tpool_free(struct iscsi_session *session)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < session->cmds_max; i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
kfifo_free(tcp_ctask->r2tqueue);
|
|
iscsi_pool_free(&tcp_ctask->r2tpool,
|
|
(void**)tcp_ctask->r2ts);
|
|
}
|
|
}
|
|
|
|
static int
|
|
iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
|
|
uint32_t value)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
|
|
switch(param) {
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH: {
|
|
char *saveptr = tcp_conn->data;
|
|
gfp_t flags = GFP_KERNEL;
|
|
|
|
if (tcp_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)
|
|
tcp_conn->data = kmalloc(value, flags);
|
|
else
|
|
tcp_conn->data = (void*)__get_free_pages(flags,
|
|
get_order(value));
|
|
if (tcp_conn->data == NULL) {
|
|
tcp_conn->data = saveptr;
|
|
return -ENOMEM;
|
|
}
|
|
if (tcp_conn->data_size <= PAGE_SIZE)
|
|
kfree(saveptr);
|
|
else
|
|
free_pages((unsigned long)saveptr,
|
|
get_order(tcp_conn->data_size));
|
|
conn->max_recv_dlength = value;
|
|
tcp_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;
|
|
tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
|
|
if (conn->hdrdgst_en) {
|
|
tcp_conn->hdr_size += sizeof(__u32);
|
|
if (!tcp_conn->tx_tfm)
|
|
tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c",
|
|
0);
|
|
if (!tcp_conn->tx_tfm)
|
|
return -ENOMEM;
|
|
if (!tcp_conn->rx_tfm)
|
|
tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c",
|
|
0);
|
|
if (!tcp_conn->rx_tfm) {
|
|
crypto_free_tfm(tcp_conn->tx_tfm);
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
if (tcp_conn->tx_tfm)
|
|
crypto_free_tfm(tcp_conn->tx_tfm);
|
|
if (tcp_conn->rx_tfm)
|
|
crypto_free_tfm(tcp_conn->rx_tfm);
|
|
}
|
|
break;
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
conn->datadgst_en = value;
|
|
if (conn->datadgst_en) {
|
|
if (!tcp_conn->data_tx_tfm)
|
|
tcp_conn->data_tx_tfm =
|
|
crypto_alloc_tfm("crc32c", 0);
|
|
if (!tcp_conn->data_tx_tfm)
|
|
return -ENOMEM;
|
|
if (!tcp_conn->data_rx_tfm)
|
|
tcp_conn->data_rx_tfm =
|
|
crypto_alloc_tfm("crc32c", 0);
|
|
if (!tcp_conn->data_rx_tfm) {
|
|
crypto_free_tfm(tcp_conn->data_tx_tfm);
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
if (tcp_conn->data_tx_tfm)
|
|
crypto_free_tfm(tcp_conn->data_tx_tfm);
|
|
if (tcp_conn->data_rx_tfm)
|
|
crypto_free_tfm(tcp_conn->data_rx_tfm);
|
|
}
|
|
tcp_conn->sendpage = conn->datadgst_en ?
|
|
sock_no_sendpage : tcp_conn->sock->ops->sendpage;
|
|
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;
|
|
case ISCSI_PARAM_EXP_STATSN:
|
|
conn->exp_statsn = value;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iscsi_session_get_param(struct iscsi_cls_session *cls_session,
|
|
enum iscsi_param param, uint32_t *value)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
|
|
struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
|
|
|
|
switch(param) {
|
|
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 -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, uint32_t *value)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct inet_sock *inet;
|
|
|
|
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_CONN_PORT:
|
|
mutex_lock(&conn->xmitmutex);
|
|
if (!tcp_conn->sock) {
|
|
mutex_unlock(&conn->xmitmutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
inet = inet_sk(tcp_conn->sock->sk);
|
|
*value = be16_to_cpu(inet->dport);
|
|
mutex_unlock(&conn->xmitmutex);
|
|
case ISCSI_PARAM_EXP_STATSN:
|
|
*value = conn->exp_statsn;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
struct sock *sk;
|
|
struct inet_sock *inet;
|
|
struct ipv6_pinfo *np;
|
|
int len = 0;
|
|
|
|
switch (param) {
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
mutex_lock(&conn->xmitmutex);
|
|
if (!tcp_conn->sock) {
|
|
mutex_unlock(&conn->xmitmutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sk = tcp_conn->sock->sk;
|
|
if (sk->sk_family == PF_INET) {
|
|
inet = inet_sk(sk);
|
|
len = sprintf(buf, "%u.%u.%u.%u\n",
|
|
NIPQUAD(inet->daddr));
|
|
} else {
|
|
np = inet6_sk(sk);
|
|
len = sprintf(buf,
|
|
"%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
|
|
NIP6(np->daddr));
|
|
}
|
|
mutex_unlock(&conn->xmitmutex);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static void
|
|
iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
|
|
|
stats->txdata_octets = conn->txdata_octets;
|
|
stats->rxdata_octets = conn->rxdata_octets;
|
|
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
|
|
stats->dataout_pdus = conn->dataout_pdus_cnt;
|
|
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
|
|
stats->datain_pdus = conn->datain_pdus_cnt;
|
|
stats->r2t_pdus = conn->r2t_pdus_cnt;
|
|
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
|
|
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
|
|
stats->custom_length = 3;
|
|
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
|
|
stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
|
|
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
|
|
stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
|
|
strcpy(stats->custom[2].desc, "eh_abort_cnt");
|
|
stats->custom[2].value = conn->eh_abort_cnt;
|
|
}
|
|
|
|
static struct iscsi_cls_session *
|
|
iscsi_tcp_session_create(struct iscsi_transport *iscsit,
|
|
struct scsi_transport_template *scsit,
|
|
uint32_t initial_cmdsn, uint32_t *hostno)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
uint32_t hn;
|
|
int cmd_i;
|
|
|
|
cls_session = iscsi_session_setup(iscsit, scsit,
|
|
sizeof(struct iscsi_tcp_cmd_task),
|
|
sizeof(struct iscsi_tcp_mgmt_task),
|
|
initial_cmdsn, &hn);
|
|
if (!cls_session)
|
|
return NULL;
|
|
*hostno = hn;
|
|
|
|
session = class_to_transport_session(cls_session);
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
|
|
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
|
|
|
|
ctask->hdr = &tcp_ctask->hdr;
|
|
}
|
|
|
|
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
|
|
struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
|
|
struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
|
|
|
|
mtask->hdr = &tcp_mtask->hdr;
|
|
}
|
|
|
|
if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
|
|
goto r2tpool_alloc_fail;
|
|
|
|
return cls_session;
|
|
|
|
r2tpool_alloc_fail:
|
|
iscsi_session_teardown(cls_session);
|
|
return NULL;
|
|
}
|
|
|
|
static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
|
|
{
|
|
iscsi_r2tpool_free(class_to_transport_session(cls_session));
|
|
iscsi_session_teardown(cls_session);
|
|
}
|
|
|
|
static struct scsi_host_template iscsi_sht = {
|
|
.name = "iSCSI Initiator over TCP/IP, v"
|
|
ISCSI_TCP_VERSION,
|
|
.queuecommand = iscsi_queuecommand,
|
|
.change_queue_depth = iscsi_change_queue_depth,
|
|
.can_queue = ISCSI_XMIT_CMDS_MAX - 1,
|
|
.sg_tablesize = ISCSI_SG_TABLESIZE,
|
|
.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,
|
|
.proc_name = "iscsi_tcp",
|
|
.this_id = -1,
|
|
};
|
|
|
|
static struct iscsi_transport iscsi_tcp_transport = {
|
|
.owner = THIS_MODULE,
|
|
.name = "tcp",
|
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
|
|
| CAP_DATADGST,
|
|
.param_mask = ISCSI_MAX_RECV_DLENGTH |
|
|
ISCSI_MAX_XMIT_DLENGTH |
|
|
ISCSI_HDRDGST_EN |
|
|
ISCSI_DATADGST_EN |
|
|
ISCSI_INITIAL_R2T_EN |
|
|
ISCSI_MAX_R2T |
|
|
ISCSI_IMM_DATA_EN |
|
|
ISCSI_FIRST_BURST |
|
|
ISCSI_MAX_BURST |
|
|
ISCSI_PDU_INORDER_EN |
|
|
ISCSI_DATASEQ_INORDER_EN |
|
|
ISCSI_ERL |
|
|
ISCSI_CONN_PORT |
|
|
ISCSI_CONN_ADDRESS |
|
|
ISCSI_EXP_STATSN,
|
|
.host_template = &iscsi_sht,
|
|
.conndata_size = sizeof(struct iscsi_conn),
|
|
.max_conn = 1,
|
|
.max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
|
|
/* session management */
|
|
.create_session = iscsi_tcp_session_create,
|
|
.destroy_session = iscsi_tcp_session_destroy,
|
|
/* connection management */
|
|
.create_conn = iscsi_tcp_conn_create,
|
|
.bind_conn = iscsi_tcp_conn_bind,
|
|
.destroy_conn = iscsi_tcp_conn_destroy,
|
|
.set_param = iscsi_conn_set_param,
|
|
.get_conn_param = iscsi_conn_get_param,
|
|
.get_conn_str_param = iscsi_conn_get_str_param,
|
|
.get_session_param = iscsi_session_get_param,
|
|
.start_conn = iscsi_conn_start,
|
|
.stop_conn = iscsi_conn_stop,
|
|
/* these are called as part of conn recovery */
|
|
.suspend_conn_recv = iscsi_tcp_suspend_conn_rx,
|
|
.terminate_conn = iscsi_tcp_terminate_conn,
|
|
/* IO */
|
|
.send_pdu = iscsi_conn_send_pdu,
|
|
.get_stats = iscsi_conn_get_stats,
|
|
.init_cmd_task = iscsi_tcp_cmd_init,
|
|
.init_mgmt_task = iscsi_tcp_mgmt_init,
|
|
.xmit_cmd_task = iscsi_tcp_ctask_xmit,
|
|
.xmit_mgmt_task = iscsi_tcp_mtask_xmit,
|
|
.cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
|
|
/* recovery */
|
|
.session_recovery_timedout = iscsi_session_recovery_timedout,
|
|
};
|
|
|
|
static int __init
|
|
iscsi_tcp_init(void)
|
|
{
|
|
if (iscsi_max_lun < 1) {
|
|
printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
|
|
iscsi_max_lun);
|
|
return -EINVAL;
|
|
}
|
|
iscsi_tcp_transport.max_lun = iscsi_max_lun;
|
|
|
|
if (!iscsi_register_transport(&iscsi_tcp_transport))
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
iscsi_tcp_exit(void)
|
|
{
|
|
iscsi_unregister_transport(&iscsi_tcp_transport);
|
|
}
|
|
|
|
module_init(iscsi_tcp_init);
|
|
module_exit(iscsi_tcp_exit);
|