66bbe0ce11
The previous patches converted iscsi_tcp to support sg chaining. This patch sets the proper flags and sets sg_table size to 4096. This allows fs io to be capped at max_sectors, but passthrough IO to be limited by some other part of the kernel. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
138 lines
3.7 KiB
C
138 lines
3.7 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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struct crypto_hash;
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struct socket;
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struct iscsi_tcp_conn;
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struct iscsi_segment;
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typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *,
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struct iscsi_segment *);
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struct iscsi_segment {
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unsigned char *data;
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unsigned int size;
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unsigned int copied;
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unsigned int total_size;
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unsigned int total_copied;
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struct hash_desc *hash;
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unsigned char recv_digest[ISCSI_DIGEST_SIZE];
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unsigned char digest[ISCSI_DIGEST_SIZE];
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unsigned int digest_len;
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struct scatterlist *sg;
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void *sg_mapped;
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unsigned int sg_offset;
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iscsi_segment_done_fn_t *done;
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};
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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 iscsi_segment segment;
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/* Allocate buffer for BHS + AHS */
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uint32_t hdr_buf[64];
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/* copied and flipped values */
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int datalen;
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};
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/* Socket connection send helper */
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struct iscsi_tcp_send {
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struct iscsi_hdr *hdr;
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struct iscsi_segment segment;
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struct iscsi_segment data_segment;
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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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int stop_stage; /* conn_stop() flag: *
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* stop to recover, *
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* stop to terminate */
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/* control data */
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struct iscsi_tcp_recv in; /* TCP receive context */
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struct iscsi_tcp_send out; /* TCP send context */
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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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int error;
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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_data_task {
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struct iscsi_data hdr; /* PDU */
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char hdrext[ISCSI_DIGEST_SIZE];/* Header-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[ISCSI_DIGEST_SIZE]; /* Header-Digest */
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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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int sent; /* R2T sequence progress */
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int data_count; /* DATA-Out payload progress */
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int solicit_datasn;
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struct iscsi_data_task dtask; /* Data-Out header buf */
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};
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struct iscsi_tcp_cmd_task {
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struct iscsi_hdr_buff {
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struct iscsi_cmd cmd_hdr;
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char hdrextbuf[ISCSI_MAX_AHS_SIZE +
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ISCSI_DIGEST_SIZE];
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} hdr;
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int sent;
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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_pool r2tpool;
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struct kfifo *r2tqueue;
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struct iscsi_data_task unsol_dtask; /* Data-Out header buf */
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};
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#endif /* ISCSI_H */
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