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>
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
|
|
* iSCSI Initiator TCP Transport
|
|
* Copyright (C) 2004 Dmitry Yusupov
|
|
* Copyright (C) 2004 Alex Aizman
|
|
* Copyright (C) 2005 - 2006 Mike Christie
|
|
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
|
|
* maintained by open-iscsi@googlegroups.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published
|
|
* by the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* See the file COPYING included with this distribution for more details.
|
|
*/
|
|
|
|
#ifndef ISCSI_TCP_H
|
|
#define ISCSI_TCP_H
|
|
|
|
#include <scsi/libiscsi.h>
|
|
|
|
struct crypto_hash;
|
|
struct socket;
|
|
struct iscsi_tcp_conn;
|
|
struct iscsi_segment;
|
|
|
|
typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *,
|
|
struct iscsi_segment *);
|
|
|
|
struct iscsi_segment {
|
|
unsigned char *data;
|
|
unsigned int size;
|
|
unsigned int copied;
|
|
unsigned int total_size;
|
|
unsigned int total_copied;
|
|
|
|
struct hash_desc *hash;
|
|
unsigned char recv_digest[ISCSI_DIGEST_SIZE];
|
|
unsigned char digest[ISCSI_DIGEST_SIZE];
|
|
unsigned int digest_len;
|
|
|
|
struct scatterlist *sg;
|
|
void *sg_mapped;
|
|
unsigned int sg_offset;
|
|
|
|
iscsi_segment_done_fn_t *done;
|
|
};
|
|
|
|
/* Socket connection recieve helper */
|
|
struct iscsi_tcp_recv {
|
|
struct iscsi_hdr *hdr;
|
|
struct iscsi_segment segment;
|
|
|
|
/* Allocate buffer for BHS + AHS */
|
|
uint32_t hdr_buf[64];
|
|
|
|
/* copied and flipped values */
|
|
int datalen;
|
|
};
|
|
|
|
/* Socket connection send helper */
|
|
struct iscsi_tcp_send {
|
|
struct iscsi_hdr *hdr;
|
|
struct iscsi_segment segment;
|
|
struct iscsi_segment data_segment;
|
|
};
|
|
|
|
struct iscsi_tcp_conn {
|
|
struct iscsi_conn *iscsi_conn;
|
|
struct socket *sock;
|
|
int stop_stage; /* conn_stop() flag: *
|
|
* stop to recover, *
|
|
* stop to terminate */
|
|
/* control data */
|
|
struct iscsi_tcp_recv in; /* TCP receive context */
|
|
struct iscsi_tcp_send out; /* TCP send context */
|
|
|
|
/* old values for socket callbacks */
|
|
void (*old_data_ready)(struct sock *, int);
|
|
void (*old_state_change)(struct sock *);
|
|
void (*old_write_space)(struct sock *);
|
|
|
|
/* data and header digests */
|
|
struct hash_desc tx_hash; /* CRC32C (Tx) */
|
|
struct hash_desc rx_hash; /* CRC32C (Rx) */
|
|
|
|
/* MIB custom statistics */
|
|
uint32_t sendpage_failures_cnt;
|
|
uint32_t discontiguous_hdr_cnt;
|
|
|
|
int error;
|
|
|
|
ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
|
|
};
|
|
|
|
struct iscsi_data_task {
|
|
struct iscsi_data hdr; /* PDU */
|
|
char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */
|
|
};
|
|
|
|
struct iscsi_tcp_mgmt_task {
|
|
struct iscsi_hdr hdr;
|
|
char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */
|
|
};
|
|
|
|
struct iscsi_r2t_info {
|
|
__be32 ttt; /* copied from R2T */
|
|
__be32 exp_statsn; /* copied from R2T */
|
|
uint32_t data_length; /* copied from R2T */
|
|
uint32_t data_offset; /* copied from R2T */
|
|
int sent; /* R2T sequence progress */
|
|
int data_count; /* DATA-Out payload progress */
|
|
int solicit_datasn;
|
|
struct iscsi_data_task dtask; /* Data-Out header buf */
|
|
};
|
|
|
|
struct iscsi_tcp_cmd_task {
|
|
struct iscsi_hdr_buff {
|
|
struct iscsi_cmd cmd_hdr;
|
|
char hdrextbuf[ISCSI_MAX_AHS_SIZE +
|
|
ISCSI_DIGEST_SIZE];
|
|
} hdr;
|
|
|
|
int sent;
|
|
uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
|
|
int data_offset;
|
|
struct iscsi_r2t_info *r2t; /* in progress R2T */
|
|
struct iscsi_pool r2tpool;
|
|
struct kfifo *r2tqueue;
|
|
struct iscsi_data_task unsol_dtask; /* Data-Out header buf */
|
|
};
|
|
|
|
#endif /* ISCSI_H */
|