linux/net/sctp/stream_sched_rr.c
Thomas Gleixner 47505b8bcf treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104
Based on 1 normalized pattern(s):

  this sctp implementation 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 or at
  your option any later version this sctp implementation 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 you should have received a copy of the gnu general
  public license along with gnu cc see the file copying if not see
  http www gnu org licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 42 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190523091649.683323110@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:39:00 +02:00

192 lines
4.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/* SCTP kernel implementation
* (C) Copyright Red Hat Inc. 2017
*
* This file is part of the SCTP kernel implementation
*
* These functions manipulate sctp stream queue/scheduling.
*
* Please send any bug reports or fixes you make to the
* email addresched(es):
* lksctp developers <linux-sctp@vger.kernel.org>
*
* Written or modified by:
* Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
*/
#include <linux/list.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>
#include <net/sctp/stream_sched.h>
/* Priority handling
* RFC DRAFT ndata section 3.2
*/
static void sctp_sched_rr_unsched_all(struct sctp_stream *stream);
static void sctp_sched_rr_next_stream(struct sctp_stream *stream)
{
struct list_head *pos;
pos = stream->rr_next->rr_list.next;
if (pos == &stream->rr_list)
pos = pos->next;
stream->rr_next = list_entry(pos, struct sctp_stream_out_ext, rr_list);
}
static void sctp_sched_rr_unsched(struct sctp_stream *stream,
struct sctp_stream_out_ext *soute)
{
if (stream->rr_next == soute)
/* Try to move to the next stream */
sctp_sched_rr_next_stream(stream);
list_del_init(&soute->rr_list);
/* If we have no other stream queued, clear next */
if (list_empty(&stream->rr_list))
stream->rr_next = NULL;
}
static void sctp_sched_rr_sched(struct sctp_stream *stream,
struct sctp_stream_out_ext *soute)
{
if (!list_empty(&soute->rr_list))
/* Already scheduled. */
return;
/* Schedule the stream */
list_add_tail(&soute->rr_list, &stream->rr_list);
if (!stream->rr_next)
stream->rr_next = soute;
}
static int sctp_sched_rr_set(struct sctp_stream *stream, __u16 sid,
__u16 prio, gfp_t gfp)
{
return 0;
}
static int sctp_sched_rr_get(struct sctp_stream *stream, __u16 sid,
__u16 *value)
{
return 0;
}
static int sctp_sched_rr_init(struct sctp_stream *stream)
{
INIT_LIST_HEAD(&stream->rr_list);
stream->rr_next = NULL;
return 0;
}
static int sctp_sched_rr_init_sid(struct sctp_stream *stream, __u16 sid,
gfp_t gfp)
{
INIT_LIST_HEAD(&SCTP_SO(stream, sid)->ext->rr_list);
return 0;
}
static void sctp_sched_rr_free(struct sctp_stream *stream)
{
sctp_sched_rr_unsched_all(stream);
}
static void sctp_sched_rr_enqueue(struct sctp_outq *q,
struct sctp_datamsg *msg)
{
struct sctp_stream *stream;
struct sctp_chunk *ch;
__u16 sid;
ch = list_first_entry(&msg->chunks, struct sctp_chunk, frag_list);
sid = sctp_chunk_stream_no(ch);
stream = &q->asoc->stream;
sctp_sched_rr_sched(stream, SCTP_SO(stream, sid)->ext);
}
static struct sctp_chunk *sctp_sched_rr_dequeue(struct sctp_outq *q)
{
struct sctp_stream *stream = &q->asoc->stream;
struct sctp_stream_out_ext *soute;
struct sctp_chunk *ch = NULL;
/* Bail out quickly if queue is empty */
if (list_empty(&q->out_chunk_list))
goto out;
/* Find which chunk is next */
if (stream->out_curr)
soute = stream->out_curr->ext;
else
soute = stream->rr_next;
ch = list_entry(soute->outq.next, struct sctp_chunk, stream_list);
sctp_sched_dequeue_common(q, ch);
out:
return ch;
}
static void sctp_sched_rr_dequeue_done(struct sctp_outq *q,
struct sctp_chunk *ch)
{
struct sctp_stream_out_ext *soute;
__u16 sid;
/* Last chunk on that msg, move to the next stream */
sid = sctp_chunk_stream_no(ch);
soute = SCTP_SO(&q->asoc->stream, sid)->ext;
sctp_sched_rr_next_stream(&q->asoc->stream);
if (list_empty(&soute->outq))
sctp_sched_rr_unsched(&q->asoc->stream, soute);
}
static void sctp_sched_rr_sched_all(struct sctp_stream *stream)
{
struct sctp_association *asoc;
struct sctp_stream_out_ext *soute;
struct sctp_chunk *ch;
asoc = container_of(stream, struct sctp_association, stream);
list_for_each_entry(ch, &asoc->outqueue.out_chunk_list, list) {
__u16 sid;
sid = sctp_chunk_stream_no(ch);
soute = SCTP_SO(stream, sid)->ext;
if (soute)
sctp_sched_rr_sched(stream, soute);
}
}
static void sctp_sched_rr_unsched_all(struct sctp_stream *stream)
{
struct sctp_stream_out_ext *soute, *tmp;
list_for_each_entry_safe(soute, tmp, &stream->rr_list, rr_list)
sctp_sched_rr_unsched(stream, soute);
}
static struct sctp_sched_ops sctp_sched_rr = {
.set = sctp_sched_rr_set,
.get = sctp_sched_rr_get,
.init = sctp_sched_rr_init,
.init_sid = sctp_sched_rr_init_sid,
.free = sctp_sched_rr_free,
.enqueue = sctp_sched_rr_enqueue,
.dequeue = sctp_sched_rr_dequeue,
.dequeue_done = sctp_sched_rr_dequeue_done,
.sched_all = sctp_sched_rr_sched_all,
.unsched_all = sctp_sched_rr_unsched_all,
};
void sctp_sched_ops_rr_init(void)
{
sctp_sched_ops_register(SCTP_SS_RR, &sctp_sched_rr);
}