1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* SCTP kernel implementation
3 * (C) Copyright Red Hat Inc. 2017
4 *
5 * These are definitions used by the stream schedulers, defined in RFC
6 * draft ndata (https://tools.ietf.org/html/draft-ietf-tsvwg-sctp-ndata-11)
7 *
8 * Please send any bug reports or fixes you make to the
9 * email addresses:
10 * lksctp developers <linux-sctp@vger.kernel.org>
11 *
12 * Written or modified by:
13 * Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
14 */
15
16 #ifndef __sctp_stream_sched_h__
17 #define __sctp_stream_sched_h__
18
19 struct sctp_sched_ops {
20 /* Property handling for a given stream */
21 int (*set)(struct sctp_stream *stream, __u16 sid, __u16 value,
22 gfp_t gfp);
23 int (*get)(struct sctp_stream *stream, __u16 sid, __u16 *value);
24
25 /* Init the specific scheduler */
26 int (*init)(struct sctp_stream *stream);
27 /* Init a stream */
28 int (*init_sid)(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
29 /* free a stream */
30 void (*free_sid)(struct sctp_stream *stream, __u16 sid);
31
32 /* Enqueue a chunk */
33 void (*enqueue)(struct sctp_outq *q, struct sctp_datamsg *msg);
34 /* Dequeue a chunk */
35 struct sctp_chunk *(*dequeue)(struct sctp_outq *q);
36 /* Called only if the chunk fit the packet */
37 void (*dequeue_done)(struct sctp_outq *q, struct sctp_chunk *chunk);
38 /* Schedule all chunks already enqueued */
39 void (*sched_all)(struct sctp_stream *stream);
40 /* Unschedule all chunks already enqueued */
41 void (*unsched_all)(struct sctp_stream *stream);
42 };
43
44 int sctp_sched_set_sched(struct sctp_association *asoc,
45 enum sctp_sched_type sched);
46 int sctp_sched_get_sched(struct sctp_association *asoc);
47 int sctp_sched_set_value(struct sctp_association *asoc, __u16 sid,
48 __u16 value, gfp_t gfp);
49 int sctp_sched_get_value(struct sctp_association *asoc, __u16 sid,
50 __u16 *value);
51 void sctp_sched_dequeue_done(struct sctp_outq *q, struct sctp_chunk *ch);
52
53 void sctp_sched_dequeue_common(struct sctp_outq *q, struct sctp_chunk *ch);
54 int sctp_sched_init_sid(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
55 struct sctp_sched_ops *sctp_sched_ops_from_stream(struct sctp_stream *stream);
56
57 void sctp_sched_ops_register(enum sctp_sched_type sched,
58 struct sctp_sched_ops *sched_ops);
59 void sctp_sched_ops_prio_init(void);
60 void sctp_sched_ops_rr_init(void);
61 void sctp_sched_ops_fc_init(void);
62 void sctp_sched_ops_wfq_init(void);
63
64 #endif /* __sctp_stream_sched_h__ */
65
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