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![Xin Long](/assets/img/avatar_default.png)
As Marcelo said in the stream scheduler patch: Support for I-DATA chunks, also described in RFC8260, with user message interleaving is straightforward as it just requires the schedulers to probe for the feature and ignore datamsg boundaries when dequeueing. All needs to do is just to ignore datamsg boundaries when dequeueing. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo R. Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
287 lines
6.6 KiB
C
287 lines
6.6 KiB
C
/* SCTP kernel implementation
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* (C) Copyright Red Hat Inc. 2017
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*
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* This file is part of the SCTP kernel implementation
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*
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* These functions manipulate sctp stream queue/scheduling.
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Please send any bug reports or fixes you make to the
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* email addresched(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
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*/
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#include <linux/list.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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#include <net/sctp/stream_sched.h>
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/* First Come First Serve (a.k.a. FIFO)
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* RFC DRAFT ndata Section 3.1
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*/
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static int sctp_sched_fcfs_set(struct sctp_stream *stream, __u16 sid,
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__u16 value, gfp_t gfp)
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{
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return 0;
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}
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static int sctp_sched_fcfs_get(struct sctp_stream *stream, __u16 sid,
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__u16 *value)
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{
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*value = 0;
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return 0;
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}
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static int sctp_sched_fcfs_init(struct sctp_stream *stream)
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{
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return 0;
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}
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static int sctp_sched_fcfs_init_sid(struct sctp_stream *stream, __u16 sid,
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gfp_t gfp)
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{
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return 0;
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}
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static void sctp_sched_fcfs_free(struct sctp_stream *stream)
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{
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}
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static void sctp_sched_fcfs_enqueue(struct sctp_outq *q,
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struct sctp_datamsg *msg)
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{
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}
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static struct sctp_chunk *sctp_sched_fcfs_dequeue(struct sctp_outq *q)
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{
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struct sctp_stream *stream = &q->asoc->stream;
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struct sctp_chunk *ch = NULL;
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struct list_head *entry;
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if (list_empty(&q->out_chunk_list))
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goto out;
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if (stream->out_curr) {
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ch = list_entry(stream->out_curr->ext->outq.next,
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struct sctp_chunk, stream_list);
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} else {
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entry = q->out_chunk_list.next;
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ch = list_entry(entry, struct sctp_chunk, list);
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}
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sctp_sched_dequeue_common(q, ch);
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out:
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return ch;
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}
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static void sctp_sched_fcfs_dequeue_done(struct sctp_outq *q,
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struct sctp_chunk *chunk)
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{
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}
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static void sctp_sched_fcfs_sched_all(struct sctp_stream *stream)
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{
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}
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static void sctp_sched_fcfs_unsched_all(struct sctp_stream *stream)
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{
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}
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static struct sctp_sched_ops sctp_sched_fcfs = {
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.set = sctp_sched_fcfs_set,
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.get = sctp_sched_fcfs_get,
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.init = sctp_sched_fcfs_init,
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.init_sid = sctp_sched_fcfs_init_sid,
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.free = sctp_sched_fcfs_free,
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.enqueue = sctp_sched_fcfs_enqueue,
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.dequeue = sctp_sched_fcfs_dequeue,
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.dequeue_done = sctp_sched_fcfs_dequeue_done,
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.sched_all = sctp_sched_fcfs_sched_all,
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.unsched_all = sctp_sched_fcfs_unsched_all,
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};
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static void sctp_sched_ops_fcfs_init(void)
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{
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sctp_sched_ops_register(SCTP_SS_FCFS, &sctp_sched_fcfs);
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}
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/* API to other parts of the stack */
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static struct sctp_sched_ops *sctp_sched_ops[SCTP_SS_MAX + 1];
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void sctp_sched_ops_register(enum sctp_sched_type sched,
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struct sctp_sched_ops *sched_ops)
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{
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sctp_sched_ops[sched] = sched_ops;
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}
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void sctp_sched_ops_init(void)
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{
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sctp_sched_ops_fcfs_init();
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sctp_sched_ops_prio_init();
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sctp_sched_ops_rr_init();
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}
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int sctp_sched_set_sched(struct sctp_association *asoc,
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enum sctp_sched_type sched)
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{
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struct sctp_sched_ops *n = sctp_sched_ops[sched];
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struct sctp_sched_ops *old = asoc->outqueue.sched;
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struct sctp_datamsg *msg = NULL;
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struct sctp_chunk *ch;
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int i, ret = 0;
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if (old == n)
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return ret;
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if (sched > SCTP_SS_MAX)
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return -EINVAL;
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if (old) {
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old->free(&asoc->stream);
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/* Give the next scheduler a clean slate. */
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for (i = 0; i < asoc->stream.outcnt; i++) {
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void *p = asoc->stream.out[i].ext;
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if (!p)
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continue;
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p += offsetofend(struct sctp_stream_out_ext, outq);
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memset(p, 0, sizeof(struct sctp_stream_out_ext) -
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offsetofend(struct sctp_stream_out_ext, outq));
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}
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}
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asoc->outqueue.sched = n;
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n->init(&asoc->stream);
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for (i = 0; i < asoc->stream.outcnt; i++) {
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if (!asoc->stream.out[i].ext)
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continue;
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ret = n->init_sid(&asoc->stream, i, GFP_KERNEL);
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if (ret)
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goto err;
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}
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/* We have to requeue all chunks already queued. */
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list_for_each_entry(ch, &asoc->outqueue.out_chunk_list, list) {
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if (ch->msg == msg)
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continue;
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msg = ch->msg;
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n->enqueue(&asoc->outqueue, msg);
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}
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return ret;
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err:
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n->free(&asoc->stream);
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asoc->outqueue.sched = &sctp_sched_fcfs; /* Always safe */
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return ret;
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}
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int sctp_sched_get_sched(struct sctp_association *asoc)
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{
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int i;
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for (i = 0; i <= SCTP_SS_MAX; i++)
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if (asoc->outqueue.sched == sctp_sched_ops[i])
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return i;
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return 0;
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}
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int sctp_sched_set_value(struct sctp_association *asoc, __u16 sid,
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__u16 value, gfp_t gfp)
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{
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if (sid >= asoc->stream.outcnt)
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return -EINVAL;
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if (!asoc->stream.out[sid].ext) {
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int ret;
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ret = sctp_stream_init_ext(&asoc->stream, sid);
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if (ret)
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return ret;
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}
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return asoc->outqueue.sched->set(&asoc->stream, sid, value, gfp);
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}
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int sctp_sched_get_value(struct sctp_association *asoc, __u16 sid,
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__u16 *value)
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{
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if (sid >= asoc->stream.outcnt)
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return -EINVAL;
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if (!asoc->stream.out[sid].ext)
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return 0;
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return asoc->outqueue.sched->get(&asoc->stream, sid, value);
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}
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void sctp_sched_dequeue_done(struct sctp_outq *q, struct sctp_chunk *ch)
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{
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if (!list_is_last(&ch->frag_list, &ch->msg->chunks) &&
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!q->asoc->intl_enable) {
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struct sctp_stream_out *sout;
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__u16 sid;
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/* datamsg is not finish, so save it as current one,
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* in case application switch scheduler or a higher
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* priority stream comes in.
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*/
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sid = sctp_chunk_stream_no(ch);
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sout = &q->asoc->stream.out[sid];
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q->asoc->stream.out_curr = sout;
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return;
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}
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q->asoc->stream.out_curr = NULL;
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q->sched->dequeue_done(q, ch);
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}
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/* Auxiliary functions for the schedulers */
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void sctp_sched_dequeue_common(struct sctp_outq *q, struct sctp_chunk *ch)
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{
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list_del_init(&ch->list);
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list_del_init(&ch->stream_list);
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q->out_qlen -= ch->skb->len;
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}
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int sctp_sched_init_sid(struct sctp_stream *stream, __u16 sid, gfp_t gfp)
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{
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struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
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INIT_LIST_HEAD(&stream->out[sid].ext->outq);
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return sched->init_sid(stream, sid, gfp);
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}
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struct sctp_sched_ops *sctp_sched_ops_from_stream(struct sctp_stream *stream)
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{
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struct sctp_association *asoc;
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asoc = container_of(stream, struct sctp_association, stream);
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return asoc->outqueue.sched;
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}
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