projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a081c13e MC |
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 [email protected] | |
| 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; | |
| 2856830b | 42 | unsigned char padbuf[ISCSI_PAD_LEN]; |
| a081c13e MC |
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; | |
| 70c7c88a | 50 | bool atomic_mapped; |
| a081c13e MC |
51 | |
| 52 | iscsi_segment_done_fn_t *done; | |
| 53 | }; | |
| 54 | ||
| 25985edc | 55 | /* Socket connection receive helper */ |
| a081c13e MC |
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; | |
| 45465487 | 84 | struct kfifo r2tqueue; |
| a081c13e MC |
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); | |
| 6df19a79 MC |
104 | extern int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
| 105 | struct iscsi_segment *segment, int recv, | |
| a081c13e MC |
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); | |
| 1304be5f | 131 | extern int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf); |
| a081c13e MC |
132 | extern void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
| 133 | struct iscsi_stats *stats); | |
| 134 | #endif /* LIBISCSI_TCP_H */ |