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Based on 3 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
/* 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 open-iscsi@googlegroups.com
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*
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* See the file COPYING included with this distribution for more details.
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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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