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1/* SCTP kernel implementation
2 * (C) Copyright Red Hat Inc. 2017
3 *
4 * These are definitions used by the stream schedulers, defined in RFC
5 * draft ndata (https://tools.ietf.org/html/draft-ietf-tsvwg-sctp-ndata-11)
6 *
7 * This SCTP implementation is free software;
8 * you can redistribute it and/or modify it under the terms of
9 * the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
11 * any later version.
12 *
13 * This SCTP implementation is distributed in the hope that it
14 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
15 * ************************
16 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17 * See the GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with GNU CC; see the file COPYING. If not, see
21 * <http://www.gnu.org/licenses/>.
22 *
23 * Please send any bug reports or fixes you make to the
24 * email addresses:
25 * lksctp developers <linux-sctp@vger.kernel.org>
26 *
27 * Written or modified by:
28 * Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
29 */
30
31#ifndef __sctp_stream_sched_h__
32#define __sctp_stream_sched_h__
33
34struct sctp_sched_ops {
35 /* Property handling for a given stream */
36 int (*set)(struct sctp_stream *stream, __u16 sid, __u16 value,
37 gfp_t gfp);
38 int (*get)(struct sctp_stream *stream, __u16 sid, __u16 *value);
39
40 /* Init the specific scheduler */
41 int (*init)(struct sctp_stream *stream);
42 /* Init a stream */
43 int (*init_sid)(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
44 /* Frees the entire thing */
45 void (*free)(struct sctp_stream *stream);
46
47 /* Enqueue a chunk */
48 void (*enqueue)(struct sctp_outq *q, struct sctp_datamsg *msg);
49 /* Dequeue a chunk */
50 struct sctp_chunk *(*dequeue)(struct sctp_outq *q);
51 /* Called only if the chunk fit the packet */
52 void (*dequeue_done)(struct sctp_outq *q, struct sctp_chunk *chunk);
53 /* Sched all chunks already enqueued */
54 void (*sched_all)(struct sctp_stream *steam);
55 /* Unched all chunks already enqueued */
56 void (*unsched_all)(struct sctp_stream *steam);
57};
58
59int sctp_sched_set_sched(struct sctp_association *asoc,
60 enum sctp_sched_type sched);
61int sctp_sched_get_sched(struct sctp_association *asoc);
62int sctp_sched_set_value(struct sctp_association *asoc, __u16 sid,
63 __u16 value, gfp_t gfp);
64int sctp_sched_get_value(struct sctp_association *asoc, __u16 sid,
65 __u16 *value);
66void sctp_sched_dequeue_done(struct sctp_outq *q, struct sctp_chunk *ch);
67
68void sctp_sched_dequeue_common(struct sctp_outq *q, struct sctp_chunk *ch);
69int sctp_sched_init_sid(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
70struct sctp_sched_ops *sctp_sched_ops_from_stream(struct sctp_stream *stream);
71
72void sctp_sched_ops_register(enum sctp_sched_type sched,
73 struct sctp_sched_ops *sched_ops);
74void sctp_sched_ops_prio_init(void);
75void sctp_sched_ops_rr_init(void);
76
77#endif /* __sctp_stream_sched_h__ */