/* * 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_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_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 */