linux/drivers/scsi/iscsi_tcp.h
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   1/*
   2 * iSCSI Initiator TCP Transport
   3 * Copyright (C) 2004 Dmitry Yusupov
   4 * Copyright (C) 2004 Alex Aizman
   5 * Copyright (C) 2005 - 2006 Mike Christie
   6 * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
   7 * maintained by open-iscsi@googlegroups.com
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published
  11 * by the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful, but
  15 * WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17 * General Public License for more details.
  18 *
  19 * See the file COPYING included with this distribution for more details.
  20 */
  21
  22#ifndef ISCSI_SW_TCP_H
  23#define ISCSI_SW_TCP_H
  24
  25#include <scsi/libiscsi.h>
  26#include <scsi/libiscsi_tcp.h>
  27
  28struct socket;
  29struct iscsi_tcp_conn;
  30
  31/* Socket connection send helper */
  32struct iscsi_sw_tcp_send {
  33        struct iscsi_hdr        *hdr;
  34        struct iscsi_segment    segment;
  35        struct iscsi_segment    data_segment;
  36};
  37
  38struct iscsi_sw_tcp_conn {
  39        struct socket           *sock;
  40
  41        struct iscsi_sw_tcp_send out;
  42        /* old values for socket callbacks */
  43        void                    (*old_data_ready)(struct sock *, int);
  44        void                    (*old_state_change)(struct sock *);
  45        void                    (*old_write_space)(struct sock *);
  46
  47        /* data and header digests */
  48        struct hash_desc        tx_hash;        /* CRC32C (Tx) */
  49        struct hash_desc        rx_hash;        /* CRC32C (Rx) */
  50
  51        /* MIB custom statistics */
  52        uint32_t                sendpage_failures_cnt;
  53        uint32_t                discontiguous_hdr_cnt;
  54
  55        ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
  56};
  57
  58struct iscsi_sw_tcp_host {
  59        struct iscsi_session    *session;
  60};
  61
  62struct iscsi_sw_tcp_hdrbuf {
  63        struct iscsi_hdr        hdrbuf;
  64        char                    hdrextbuf[ISCSI_MAX_AHS_SIZE +
  65                                                  ISCSI_DIGEST_SIZE];
  66};
  67
  68#endif /* ISCSI_SW_TCP_H */
  69
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