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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 recv_digest[ISCSI_DIGEST_SIZE]; | |
43 | unsigned char digest[ISCSI_DIGEST_SIZE]; | |
44 | unsigned int digest_len; | |
45 | ||
46 | struct scatterlist *sg; | |
47 | void *sg_mapped; | |
48 | unsigned int sg_offset; | |
49 | ||
50 | iscsi_segment_done_fn_t *done; | |
51 | }; | |
52 | ||
53 | /* Socket connection recieve helper */ | |
54 | struct iscsi_tcp_recv { | |
55 | struct iscsi_hdr *hdr; | |
56 | struct iscsi_segment segment; | |
57 | ||
58 | /* Allocate buffer for BHS + AHS */ | |
59 | uint32_t hdr_buf[64]; | |
60 | ||
61 | /* copied and flipped values */ | |
62 | int datalen; | |
63 | }; | |
64 | ||
65 | struct iscsi_tcp_conn { | |
66 | struct iscsi_conn *iscsi_conn; | |
67 | void *dd_data; | |
68 | int stop_stage; /* conn_stop() flag: * | |
69 | * stop to recover, * | |
70 | * stop to terminate */ | |
71 | /* control data */ | |
72 | struct iscsi_tcp_recv in; /* TCP receive context */ | |
73 | /* CRC32C (Rx) LLD should set this is they do not offload */ | |
74 | struct hash_desc *rx_hash; | |
75 | }; | |
76 | ||
77 | struct iscsi_tcp_task { | |
78 | uint32_t exp_datasn; /* expected target's R2TSN/DataSN */ | |
79 | int data_offset; | |
80 | struct iscsi_r2t_info *r2t; /* in progress solict R2T */ | |
81 | struct iscsi_pool r2tpool; | |
82 | struct kfifo *r2tqueue; | |
83 | void *dd_data; | |
84 | }; | |
85 | ||
86 | enum { | |
87 | ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */ | |
88 | ISCSI_TCP_SKB_DONE, /* skb is out of data */ | |
89 | ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */ | |
90 | ISCSI_TCP_SUSPENDED, /* conn is suspended */ | |
91 | }; | |
92 | ||
93 | extern void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn); | |
94 | extern int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, | |
95 | unsigned int offset, bool offloaded, int *status); | |
96 | extern void iscsi_tcp_cleanup_task(struct iscsi_task *task); | |
97 | extern int iscsi_tcp_task_init(struct iscsi_task *task); | |
98 | extern int iscsi_tcp_task_xmit(struct iscsi_task *task); | |
99 | ||
100 | /* segment helpers */ | |
101 | extern int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn); | |
6df19a79 MC |
102 | extern int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
103 | struct iscsi_segment *segment, int recv, | |
a081c13e MC |
104 | unsigned copied); |
105 | extern void iscsi_tcp_segment_unmap(struct iscsi_segment *segment); | |
106 | ||
107 | extern void iscsi_segment_init_linear(struct iscsi_segment *segment, | |
108 | void *data, size_t size, | |
109 | iscsi_segment_done_fn_t *done, | |
110 | struct hash_desc *hash); | |
111 | extern int | |
112 | iscsi_segment_seek_sg(struct iscsi_segment *segment, | |
113 | struct scatterlist *sg_list, unsigned int sg_count, | |
114 | unsigned int offset, size_t size, | |
115 | iscsi_segment_done_fn_t *done, struct hash_desc *hash); | |
116 | ||
117 | /* digest helpers */ | |
118 | extern void iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, | |
119 | size_t hdrlen, | |
120 | unsigned char digest[ISCSI_DIGEST_SIZE]); | |
121 | extern struct iscsi_cls_conn * | |
122 | iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, | |
123 | uint32_t conn_idx); | |
124 | extern void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn); | |
125 | ||
126 | /* misc helpers */ | |
127 | extern int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session); | |
128 | extern void iscsi_tcp_r2tpool_free(struct iscsi_session *session); | |
129 | ||
130 | extern void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, | |
131 | struct iscsi_stats *stats); | |
132 | #endif /* LIBISCSI_TCP_H */ |