include/net/sctp/stream_sched.h

   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         /* Frees the entire thing */
  30         void (*free)(struct sctp_stream *stream);
  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         /* Sched all chunks already enqueued */
  39         void (*sched_all)(struct sctp_stream *steam);
  40         /* Unched all chunks already enqueued */
  41         void (*unsched_all)(struct sctp_stream *steam);
  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
  62 #endif /* __sctp_stream_sched_h__ */