drivers/scsi/iscsi_tcp.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * iSCSI Initiator TCP Transport
   4  * Copyright (C) 2004 Dmitry Yusupov
   5  * Copyright (C) 2004 Alex Aizman
   6  * Copyright (C) 2005 - 2006 Mike Christie
   7  * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
   8  * maintained by open-iscsi@googlegroups.com
   9  *
  10  * See the file COPYING included with this distribution for more details.
  11  */
  12
  13 #ifndef ISCSI_SW_TCP_H
  14 #define ISCSI_SW_TCP_H
  15
  16 #include <scsi/libiscsi.h>
  17 #include <scsi/libiscsi_tcp.h>
  18
  19 struct socket;
  20 struct iscsi_tcp_conn;
  21
  22 /* Socket connection send helper */
  23 struct iscsi_sw_tcp_send {
  24         struct iscsi_hdr        *hdr;
  25         struct iscsi_segment    segment;
  26         struct iscsi_segment    data_segment;
  27 };
  28
  29 struct iscsi_sw_tcp_conn {
  30         struct socket           *sock;
  31
  32         struct iscsi_sw_tcp_send out;
  33         /* old values for socket callbacks */
  34         void                    (*old_data_ready)(struct sock *);
  35         void                    (*old_state_change)(struct sock *);
  36         void                    (*old_write_space)(struct sock *);
  37
  38         /* data and header digests */
  39         struct ahash_request    *tx_hash;       /* CRC32C (Tx) */
  40         struct ahash_request    *rx_hash;       /* CRC32C (Rx) */
  41
  42         /* MIB custom statistics */
  43         uint32_t                sendpage_failures_cnt;
  44         uint32_t                discontiguous_hdr_cnt;
  45
  46         ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
  47 };
  48
  49 struct iscsi_sw_tcp_host {
  50         struct iscsi_session    *session;
  51 };
  52
  53 struct iscsi_sw_tcp_hdrbuf {
  54         struct iscsi_hdr        hdrbuf;
  55         char                    hdrextbuf[ISCSI_MAX_AHS_SIZE +
  56                                                   ISCSI_DIGEST_SIZE];
  57 };
  58
  59 #endif /* ISCSI_SW_TCP_H */