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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 | |
26 | struct iscsi_tcp_conn; |
27 | struct iscsi_segment; |
28 | struct sk_buff; |
29 | struct hash_desc; |
30 | |
31 | typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *, |
32 | struct iscsi_segment *); |
33 | |
34 | struct 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 | bool atomic_mapped; |
51 | |
52 | iscsi_segment_done_fn_t *done; |
53 | }; |
54 | |
55 | /* Socket connection receive helper */ |
56 | struct iscsi_tcp_recv { |
57 | struct iscsi_hdr *hdr; |
58 | struct iscsi_segment segment; |
59 | |
60 | /* Allocate buffer for BHS + AHS */ |
61 | uint32_t hdr_buf[64]; |
62 | |
63 | /* copied and flipped values */ |
64 | int datalen; |
65 | }; |
66 | |
67 | struct iscsi_tcp_conn { |
68 | struct iscsi_conn *iscsi_conn; |
69 | void *dd_data; |
70 | int stop_stage; /* conn_stop() flag: * |
71 | * stop to recover, * |
72 | * stop to terminate */ |
73 | /* control data */ |
74 | struct iscsi_tcp_recv in; /* TCP receive context */ |
75 | /* CRC32C (Rx) LLD should set this is they do not offload */ |
76 | struct hash_desc *rx_hash; |
77 | }; |
78 | |
79 | struct iscsi_tcp_task { |
80 | uint32_t exp_datasn; /* expected target's R2TSN/DataSN */ |
81 | int data_offset; |
82 | struct iscsi_r2t_info *r2t; /* in progress solict R2T */ |
83 | struct iscsi_pool r2tpool; |
84 | struct kfifo r2tqueue; |
85 | void *dd_data; |
86 | }; |
87 | |
88 | enum { |
89 | ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */ |
90 | ISCSI_TCP_SKB_DONE, /* skb is out of data */ |
91 | ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */ |
92 | ISCSI_TCP_SUSPENDED, /* conn is suspended */ |
93 | }; |
94 | |
95 | extern void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn); |
96 | extern int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, |
97 | unsigned int offset, bool offloaded, int *status); |
98 | extern void iscsi_tcp_cleanup_task(struct iscsi_task *task); |
99 | extern int iscsi_tcp_task_init(struct iscsi_task *task); |
100 | extern int iscsi_tcp_task_xmit(struct iscsi_task *task); |
101 | |
102 | /* segment helpers */ |
103 | extern int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn); |
104 | extern int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
105 | struct iscsi_segment *segment, int recv, |
106 | unsigned copied); |
107 | extern void iscsi_tcp_segment_unmap(struct iscsi_segment *segment); |
108 | |
109 | extern void iscsi_segment_init_linear(struct iscsi_segment *segment, |
110 | void *data, size_t size, |
111 | iscsi_segment_done_fn_t *done, |
112 | struct hash_desc *hash); |
113 | extern int |
114 | iscsi_segment_seek_sg(struct iscsi_segment *segment, |
115 | struct scatterlist *sg_list, unsigned int sg_count, |
116 | unsigned int offset, size_t size, |
117 | iscsi_segment_done_fn_t *done, struct hash_desc *hash); |
118 | |
119 | /* digest helpers */ |
120 | extern void iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, |
121 | size_t hdrlen, |
122 | unsigned char digest[ISCSI_DIGEST_SIZE]); |
123 | extern struct iscsi_cls_conn * |
124 | iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, |
125 | uint32_t conn_idx); |
126 | extern void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn); |
127 | |
128 | /* misc helpers */ |
129 | extern int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session); |
130 | extern void iscsi_tcp_r2tpool_free(struct iscsi_session *session); |
131 | extern int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf); |
132 | extern void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
133 | struct iscsi_stats *stats); |
134 | #endif /* LIBISCSI_TCP_H */ |
135 |
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