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126 lines
3.8 KiB
126 lines
3.8 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* iSCSI over TCP/IP Data-Path lib |
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* |
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* Copyright (C) 2008 Mike Christie |
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* Copyright (C) 2008 Red Hat, Inc. All rights reserved. |
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* maintained by [email protected] |
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*/ |
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#ifndef LIBISCSI_TCP_H |
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#define LIBISCSI_TCP_H |
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#include <scsi/libiscsi.h> |
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struct iscsi_tcp_conn; |
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struct iscsi_segment; |
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struct sk_buff; |
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struct ahash_request; |
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typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *, |
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struct iscsi_segment *); |
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struct iscsi_segment { |
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unsigned char *data; |
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unsigned int size; |
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unsigned int copied; |
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unsigned int total_size; |
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unsigned int total_copied; |
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struct ahash_request *hash; |
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unsigned char padbuf[ISCSI_PAD_LEN]; |
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unsigned char recv_digest[ISCSI_DIGEST_SIZE]; |
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unsigned char digest[ISCSI_DIGEST_SIZE]; |
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unsigned int digest_len; |
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struct scatterlist *sg; |
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void *sg_mapped; |
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unsigned int sg_offset; |
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bool atomic_mapped; |
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iscsi_segment_done_fn_t *done; |
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}; |
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/* Socket connection receive helper */ |
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struct iscsi_tcp_recv { |
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struct iscsi_hdr *hdr; |
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struct iscsi_segment segment; |
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/* Allocate buffer for BHS + AHS */ |
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uint32_t hdr_buf[64]; |
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/* copied and flipped values */ |
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int datalen; |
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}; |
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struct iscsi_tcp_conn { |
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struct iscsi_conn *iscsi_conn; |
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void *dd_data; |
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int stop_stage; /* conn_stop() flag: * |
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* stop to recover, * |
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* stop to terminate */ |
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/* control data */ |
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struct iscsi_tcp_recv in; /* TCP receive context */ |
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/* CRC32C (Rx) LLD should set this is they do not offload */ |
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struct ahash_request *rx_hash; |
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}; |
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struct iscsi_tcp_task { |
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uint32_t exp_datasn; /* expected target's R2TSN/DataSN */ |
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int data_offset; |
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struct iscsi_r2t_info *r2t; /* in progress solict R2T */ |
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struct iscsi_pool r2tpool; |
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struct kfifo r2tqueue; |
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void *dd_data; |
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spinlock_t pool2queue; |
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spinlock_t queue2pool; |
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}; |
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enum { |
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ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */ |
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ISCSI_TCP_SKB_DONE, /* skb is out of data */ |
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ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */ |
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ISCSI_TCP_SUSPENDED, /* conn is suspended */ |
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}; |
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extern void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn); |
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extern int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, |
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unsigned int offset, bool offloaded, int *status); |
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extern void iscsi_tcp_cleanup_task(struct iscsi_task *task); |
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extern int iscsi_tcp_task_init(struct iscsi_task *task); |
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extern int iscsi_tcp_task_xmit(struct iscsi_task *task); |
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/* segment helpers */ |
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extern int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn); |
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extern int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
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struct iscsi_segment *segment, int recv, |
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unsigned copied); |
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extern void iscsi_tcp_segment_unmap(struct iscsi_segment *segment); |
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extern void iscsi_segment_init_linear(struct iscsi_segment *segment, |
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void *data, size_t size, |
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iscsi_segment_done_fn_t *done, |
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struct ahash_request *hash); |
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extern int |
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iscsi_segment_seek_sg(struct iscsi_segment *segment, |
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struct scatterlist *sg_list, unsigned int sg_count, |
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unsigned int offset, size_t size, |
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iscsi_segment_done_fn_t *done, |
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struct ahash_request *hash); |
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/* digest helpers */ |
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extern void iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr, |
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size_t hdrlen, |
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unsigned char digest[ISCSI_DIGEST_SIZE]); |
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extern struct iscsi_cls_conn * |
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iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, |
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uint32_t conn_idx); |
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extern void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn); |
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/* misc helpers */ |
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extern int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session); |
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extern void iscsi_tcp_r2tpool_free(struct iscsi_session *session); |
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extern int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf); |
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extern void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
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struct iscsi_stats *stats); |
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#endif /* LIBISCSI_TCP_H */
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