/include/scsi/libiscsi_tcp.h
C++ Header | 133 lines | 84 code | 20 blank | 29 comment | 0 complexity | 6125d529f14026449ff50a1fef1270c8 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/* 2 * iSCSI over TCP/IP Data-Path lib 3 * 4 * Copyright (C) 2008 Mike Christie 5 * Copyright (C) 2008 Red Hat, Inc. All rights reserved. 6 * maintained by open-iscsi@googlegroups.com 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published 10 * by the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * See the file COPYING included with this distribution for more details. 19 */ 20 21#ifndef LIBISCSI_TCP_H 22#define LIBISCSI_TCP_H 23 24#include <scsi/libiscsi.h> 25 26struct iscsi_tcp_conn; 27struct iscsi_segment; 28struct sk_buff; 29struct hash_desc; 30 31typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *, 32 struct iscsi_segment *); 33 34struct iscsi_segment { 35 unsigned char *data; 36 unsigned int size; 37 unsigned int copied; 38 unsigned int total_size; 39 unsigned int total_copied; 40 41 struct hash_desc *hash; 42 unsigned char padbuf[ISCSI_PAD_LEN]; 43 unsigned char recv_digest[ISCSI_DIGEST_SIZE]; 44 unsigned char digest[ISCSI_DIGEST_SIZE]; 45 unsigned int digest_len; 46 47 struct scatterlist *sg; 48 void *sg_mapped; 49 unsigned int sg_offset; 50 51 iscsi_segment_done_fn_t *done; 52}; 53 54/* Socket connection recieve helper */ 55struct iscsi_tcp_recv { 56 struct iscsi_hdr *hdr; 57 struct iscsi_segment segment; 58 59 /* Allocate buffer for BHS + AHS */ 60 uint32_t hdr_buf[64]; 61 62 /* copied and flipped values */ 63 int datalen; 64}; 65 66struct iscsi_tcp_conn { 67 struct iscsi_conn *iscsi_conn; 68 void *dd_data; 69 int stop_stage; /* conn_stop() flag: * 70 * stop to recover, * 71 * stop to terminate */ 72 /* control data */ 73 struct iscsi_tcp_recv in; /* TCP receive context */ 74 /* CRC32C (Rx) LLD should set this is they do not offload */ 75 struct hash_desc *rx_hash; 76}; 77 78struct iscsi_tcp_task { 79 uint32_t exp_datasn; /* expected target's R2TSN/DataSN */ 80 int data_offset; 81 struct iscsi_r2t_info *r2t; /* in progress solict R2T */ 82 struct iscsi_pool r2tpool; 83 struct kfifo r2tqueue; 84 void *dd_data; 85}; 86 87enum { 88 ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */ 89 ISCSI_TCP_SKB_DONE, /* skb is out of data */ 90 ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */ 91 ISCSI_TCP_SUSPENDED, /* conn is suspended */ 92}; 93 94extern void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn); 95extern int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, 96 unsigned int offset, bool offloaded, int *status); 97extern void iscsi_tcp_cleanup_task(struct iscsi_task *task); 98extern int iscsi_tcp_task_init(struct iscsi_task *task); 99extern int iscsi_tcp_task_xmit(struct iscsi_task *task); 100 101/* segment helpers */ 102extern int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn); 103extern int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, 104 struct iscsi_segment *segment, int recv, 105 unsigned copied); 106extern void iscsi_tcp_segment_unmap(struct iscsi_segment *segment); 107 108extern void iscsi_segment_init_linear(struct iscsi_segment *segment, 109 void *data, size_t size, 110 iscsi_segment_done_fn_t *done, 111 struct hash_desc *hash); 112extern int 113iscsi_segment_seek_sg(struct iscsi_segment *segment, 114 struct scatterlist *sg_list, unsigned int sg_count, 115 unsigned int offset, size_t size, 116 iscsi_segment_done_fn_t *done, struct hash_desc *hash); 117 118/* digest helpers */ 119extern void iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, 120 size_t hdrlen, 121 unsigned char digest[ISCSI_DIGEST_SIZE]); 122extern struct iscsi_cls_conn * 123iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, 124 uint32_t conn_idx); 125extern void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn); 126 127/* misc helpers */ 128extern int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session); 129extern void iscsi_tcp_r2tpool_free(struct iscsi_session *session); 130 131extern void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, 132 struct iscsi_stats *stats); 133#endif /* LIBISCSI_TCP_H */