dbdb016d92
If we got the padding, data and header in different skbs, we were not handling the padding correctly because we attributed it to the data's skb. This resulted in the initiator reading from pad bytes + skb offset instead of the correct offset. If you could not connect with the open solaris target, this will fix the lock up problem you were hitting. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
170 lines
5 KiB
C
170 lines
5 KiB
C
/*
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* iSCSI Initiator TCP Transport
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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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#ifndef ISCSI_TCP_H
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#define ISCSI_TCP_H
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#include <scsi/libiscsi.h>
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/* Socket's Receive state machine */
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#define IN_PROGRESS_WAIT_HEADER 0x0
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#define IN_PROGRESS_HEADER_GATHER 0x1
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#define IN_PROGRESS_DATA_RECV 0x2
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#define IN_PROGRESS_DDIGEST_RECV 0x3
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#define IN_PROGRESS_PAD_RECV 0x4
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/* xmit state machine */
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#define XMSTATE_IDLE 0x0
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#define XMSTATE_CMD_HDR_INIT 0x1
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#define XMSTATE_CMD_HDR_XMIT 0x2
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#define XMSTATE_IMM_HDR 0x4
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#define XMSTATE_IMM_DATA 0x8
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#define XMSTATE_UNS_INIT 0x10
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#define XMSTATE_UNS_HDR 0x20
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#define XMSTATE_UNS_DATA 0x40
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#define XMSTATE_SOL_HDR 0x80
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#define XMSTATE_SOL_DATA 0x100
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#define XMSTATE_W_PAD 0x200
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#define XMSTATE_W_RESEND_PAD 0x400
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#define XMSTATE_W_RESEND_DATA_DIGEST 0x800
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#define XMSTATE_IMM_HDR_INIT 0x1000
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#define XMSTATE_SOL_HDR_INIT 0x2000
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#define ISCSI_PAD_LEN 4
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#define ISCSI_SG_TABLESIZE SG_ALL
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#define ISCSI_TCP_MAX_CMD_LEN 16
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struct crypto_hash;
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struct socket;
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/* Socket connection recieve helper */
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struct iscsi_tcp_recv {
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struct iscsi_hdr *hdr;
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struct sk_buff *skb;
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int offset;
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int len;
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int hdr_offset;
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int copy;
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int copied;
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int padding;
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struct iscsi_cmd_task *ctask; /* current cmd in progress */
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/* copied and flipped values */
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int datalen;
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int datadgst;
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char zero_copy_hdr;
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};
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struct iscsi_tcp_conn {
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struct iscsi_conn *iscsi_conn;
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struct socket *sock;
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struct iscsi_hdr hdr; /* header placeholder */
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char hdrext[4*sizeof(__u16) +
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sizeof(__u32)];
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int data_copied;
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int stop_stage; /* conn_stop() flag: *
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* stop to recover, *
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* stop to terminate */
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/* iSCSI connection-wide sequencing */
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int hdr_size; /* PDU header size */
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/* control data */
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struct iscsi_tcp_recv in; /* TCP receive context */
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int in_progress; /* connection state machine */
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/* old values for socket callbacks */
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void (*old_data_ready)(struct sock *, int);
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void (*old_state_change)(struct sock *);
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void (*old_write_space)(struct sock *);
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/* data and header digests */
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struct hash_desc tx_hash; /* CRC32C (Tx) */
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struct hash_desc rx_hash; /* CRC32C (Rx) */
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/* MIB custom statistics */
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uint32_t sendpage_failures_cnt;
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uint32_t discontiguous_hdr_cnt;
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ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
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};
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struct iscsi_buf {
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struct scatterlist sg;
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unsigned int sent;
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char use_sendmsg;
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};
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struct iscsi_data_task {
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struct iscsi_data hdr; /* PDU */
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char hdrext[sizeof(__u32)]; /* Header-Digest */
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struct iscsi_buf digestbuf; /* digest buffer */
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uint32_t digest; /* data digest */
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};
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struct iscsi_tcp_mgmt_task {
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struct iscsi_hdr hdr;
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char hdrext[sizeof(__u32)]; /* Header-Digest */
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int xmstate; /* mgmt xmit progress */
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struct iscsi_buf headbuf; /* header buffer */
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struct iscsi_buf sendbuf; /* in progress buffer */
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int sent;
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};
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struct iscsi_r2t_info {
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__be32 ttt; /* copied from R2T */
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__be32 exp_statsn; /* copied from R2T */
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uint32_t data_length; /* copied from R2T */
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uint32_t data_offset; /* copied from R2T */
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struct iscsi_buf headbuf; /* Data-Out Header Buffer */
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struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/
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int sent; /* R2T sequence progress */
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int data_count; /* DATA-Out payload progress */
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struct scatterlist *sg; /* per-R2T SG list */
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int solicit_datasn;
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struct iscsi_data_task dtask; /* which data task */
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};
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struct iscsi_tcp_cmd_task {
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struct iscsi_cmd hdr;
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char hdrext[4*sizeof(__u16)+ /* AHS */
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sizeof(__u32)]; /* HeaderDigest */
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char pad[ISCSI_PAD_LEN];
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int pad_count; /* padded bytes */
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struct iscsi_buf headbuf; /* header buf (xmit) */
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struct iscsi_buf sendbuf; /* in progress buffer*/
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int xmstate; /* xmit xtate machine */
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int sent;
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struct scatterlist *sg; /* per-cmd SG list */
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struct scatterlist *bad_sg; /* assert statement */
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int sg_count; /* SG's to process */
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uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
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int data_offset;
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struct iscsi_r2t_info *r2t; /* in progress R2T */
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struct iscsi_queue r2tpool;
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struct kfifo *r2tqueue;
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struct iscsi_r2t_info **r2ts;
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int digest_count;
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uint32_t immdigest; /* for imm data */
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struct iscsi_buf immbuf; /* for imm data digest */
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struct iscsi_data_task unsol_dtask; /* unsol data task */
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};
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#endif /* ISCSI_H */
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