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-rw-r--r--include/scsi/libiscsi_tcp.h126
1 files changed, 126 insertions, 0 deletions
diff --git a/include/scsi/libiscsi_tcp.h b/include/scsi/libiscsi_tcp.h
new file mode 100644
index 000000000..7c8ba9d73
--- /dev/null
+++ b/include/scsi/libiscsi_tcp.h
@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * iSCSI over TCP/IP Data-Path lib
+ *
+ * Copyright (C) 2008 Mike Christie
+ * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
+ * maintained by open-iscsi@googlegroups.com
+ */
+
+#ifndef LIBISCSI_TCP_H
+#define LIBISCSI_TCP_H
+
+#include <scsi/libiscsi.h>
+
+struct iscsi_tcp_conn;
+struct iscsi_segment;
+struct sk_buff;
+struct ahash_request;
+
+typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *,
+ struct iscsi_segment *);
+
+struct iscsi_segment {
+ unsigned char *data;
+ unsigned int size;
+ unsigned int copied;
+ unsigned int total_size;
+ unsigned int total_copied;
+
+ struct ahash_request *hash;
+ unsigned char padbuf[ISCSI_PAD_LEN];
+ unsigned char recv_digest[ISCSI_DIGEST_SIZE];
+ unsigned char digest[ISCSI_DIGEST_SIZE];
+ unsigned int digest_len;
+
+ struct scatterlist *sg;
+ void *sg_mapped;
+ unsigned int sg_offset;
+ bool atomic_mapped;
+
+ iscsi_segment_done_fn_t *done;
+};
+
+/* Socket connection receive helper */
+struct iscsi_tcp_recv {
+ struct iscsi_hdr *hdr;
+ struct iscsi_segment segment;
+
+ /* Allocate buffer for BHS + AHS */
+ uint32_t hdr_buf[64];
+
+ /* copied and flipped values */
+ int datalen;
+};
+
+struct iscsi_tcp_conn {
+ struct iscsi_conn *iscsi_conn;
+ void *dd_data;
+ int stop_stage; /* conn_stop() flag: *
+ * stop to recover, *
+ * stop to terminate */
+ /* control data */
+ struct iscsi_tcp_recv in; /* TCP receive context */
+ /* CRC32C (Rx) LLD should set this is they do not offload */
+ struct ahash_request *rx_hash;
+};
+
+struct iscsi_tcp_task {
+ uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
+ int data_offset;
+ struct iscsi_r2t_info *r2t; /* in progress solict R2T */
+ struct iscsi_pool r2tpool;
+ struct kfifo r2tqueue;
+ void *dd_data;
+ spinlock_t pool2queue;
+ spinlock_t queue2pool;
+};
+
+enum {
+ ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */
+ ISCSI_TCP_SKB_DONE, /* skb is out of data */
+ ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */
+ ISCSI_TCP_SUSPENDED, /* conn is suspended */
+};
+
+extern void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn);
+extern int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb,
+ unsigned int offset, bool offloaded, int *status);
+extern void iscsi_tcp_cleanup_task(struct iscsi_task *task);
+extern int iscsi_tcp_task_init(struct iscsi_task *task);
+extern int iscsi_tcp_task_xmit(struct iscsi_task *task);
+
+/* segment helpers */
+extern int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn);
+extern int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn,
+ struct iscsi_segment *segment, int recv,
+ unsigned copied);
+extern void iscsi_tcp_segment_unmap(struct iscsi_segment *segment);
+
+extern void iscsi_segment_init_linear(struct iscsi_segment *segment,
+ void *data, size_t size,
+ iscsi_segment_done_fn_t *done,
+ struct ahash_request *hash);
+extern int
+iscsi_segment_seek_sg(struct iscsi_segment *segment,
+ struct scatterlist *sg_list, unsigned int sg_count,
+ unsigned int offset, size_t size,
+ iscsi_segment_done_fn_t *done,
+ struct ahash_request *hash);
+
+/* digest helpers */
+extern void iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr,
+ size_t hdrlen,
+ unsigned char digest[ISCSI_DIGEST_SIZE]);
+extern struct iscsi_cls_conn *
+iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size,
+ uint32_t conn_idx);
+extern void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn);
+
+/* misc helpers */
+extern int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session);
+extern void iscsi_tcp_r2tpool_free(struct iscsi_session *session);
+extern int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf);
+extern void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
+ struct iscsi_stats *stats);
+#endif /* LIBISCSI_TCP_H */