diff --git a/include/net/sctp/stream_sched.h b/include/net/sctp/stream_sched.h
new file mode 100644
index 000000000000..c676550a4c7d
--- /dev/null
+++ b/include/net/sctp/stream_sched.h
@@ -0,0 +1,72 @@
+/* SCTP kernel implementation
+ * (C) Copyright Red Hat Inc. 2017
+ *
+ * These are definitions used by the stream schedulers, defined in RFC
+ * draft ndata (https://tools.ietf.org/html/draft-ietf-tsvwg-sctp-ndata-11)
+ *
+ * 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
+ * .
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresses:
+ * lksctp developers
+ *
+ * Written or modified by:
+ * Marcelo Ricardo Leitner
+ */
+
+#ifndef __sctp_stream_sched_h__
+#define __sctp_stream_sched_h__
+
+struct sctp_sched_ops {
+ /* Property handling for a given stream */
+ int (*set)(struct sctp_stream *stream, __u16 sid, __u16 value,
+ gfp_t gfp);
+ int (*get)(struct sctp_stream *stream, __u16 sid, __u16 *value);
+
+ /* Init the specific scheduler */
+ int (*init)(struct sctp_stream *stream);
+ /* Init a stream */
+ int (*init_sid)(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
+ /* Frees the entire thing */
+ void (*free)(struct sctp_stream *stream);
+
+ /* Enqueue a chunk */
+ void (*enqueue)(struct sctp_outq *q, struct sctp_datamsg *msg);
+ /* Dequeue a chunk */
+ struct sctp_chunk *(*dequeue)(struct sctp_outq *q);
+ /* Called only if the chunk fit the packet */
+ void (*dequeue_done)(struct sctp_outq *q, struct sctp_chunk *chunk);
+ /* Sched all chunks already enqueued */
+ void (*sched_all)(struct sctp_stream *steam);
+ /* Unched all chunks already enqueued */
+ void (*unsched_all)(struct sctp_stream *steam);
+};
+
+int sctp_sched_set_sched(struct sctp_association *asoc,
+ enum sctp_sched_type sched);
+int sctp_sched_get_sched(struct sctp_association *asoc);
+int sctp_sched_set_value(struct sctp_association *asoc, __u16 sid,
+ __u16 value, gfp_t gfp);
+int sctp_sched_get_value(struct sctp_association *asoc, __u16 sid,
+ __u16 *value);
+void sctp_sched_dequeue_done(struct sctp_outq *q, struct sctp_chunk *ch);
+
+void sctp_sched_dequeue_common(struct sctp_outq *q, struct sctp_chunk *ch);
+int sctp_sched_init_sid(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
+struct sctp_sched_ops *sctp_sched_ops_from_stream(struct sctp_stream *stream);
+
+#endif /* __sctp_stream_sched_h__ */
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index c48f7999fe9b..3c22a30fd71b 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -84,7 +84,6 @@ struct sctp_ulpq;
struct sctp_ep_common;
struct crypto_shash;
struct sctp_stream;
-struct sctp_stream_out;
#include
@@ -531,8 +530,12 @@ struct sctp_chunk {
/* How many times this chunk have been sent, for prsctp RTX policy */
int sent_count;
- /* This is our link to the per-transport transmitted list. */
- struct list_head transmitted_list;
+ union {
+ /* This is our link to the per-transport transmitted list. */
+ struct list_head transmitted_list;
+ /* List in specific stream outq */
+ struct list_head stream_list;
+ };
/* This field is used by chunks that hold fragmented data.
* For the first fragment this is the list that holds the rest of
@@ -1019,6 +1022,9 @@ struct sctp_outq {
/* Data pending that has never been transmitted. */
struct list_head out_chunk_list;
+ /* Stream scheduler being used */
+ struct sctp_sched_ops *sched;
+
unsigned int out_qlen; /* Total length of queued data chunks. */
/* Error of send failed, may used in SCTP_SEND_FAILED event. */
@@ -1325,6 +1331,7 @@ struct sctp_inithdr_host {
struct sctp_stream_out_ext {
__u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
__u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
+ struct list_head outq; /* chunks enqueued by this stream */
};
struct sctp_stream_out {
@@ -1342,6 +1349,8 @@ struct sctp_stream {
struct sctp_stream_in *in;
__u16 outcnt;
__u16 incnt;
+ /* Current stream being sent, if any */
+ struct sctp_stream_out *out_curr;
};
#define SCTP_STREAM_CLOSED 0x00
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index 6217ff8500a1..4487e7625ddb 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -1088,4 +1088,10 @@ struct sctp_add_streams {
uint16_t sas_outstrms;
};
+/* SCTP Stream schedulers */
+enum sctp_sched_type {
+ SCTP_SS_FCFS,
+ SCTP_SS_MAX = SCTP_SS_FCFS
+};
+
#endif /* _UAPI_SCTP_H */
diff --git a/net/sctp/Makefile b/net/sctp/Makefile
index 70f1b570bab9..0f6e6d1d69fd 100644
--- a/net/sctp/Makefile
+++ b/net/sctp/Makefile
@@ -12,7 +12,7 @@ sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
inqueue.o outqueue.o ulpqueue.o \
tsnmap.o bind_addr.o socket.o primitive.o \
output.o input.o debug.o stream.o auth.o \
- offload.o
+ offload.o stream_sched.o
sctp_probe-y := probe.o
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 746b07b7937d..4db012aa25f7 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -50,6 +50,7 @@
#include
#include
+#include
/* Declare internal functions here. */
static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn);
@@ -72,32 +73,38 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp);
/* Add data to the front of the queue. */
static inline void sctp_outq_head_data(struct sctp_outq *q,
- struct sctp_chunk *ch)
+ struct sctp_chunk *ch)
{
+ struct sctp_stream_out_ext *oute;
+ __u16 stream;
+
list_add(&ch->list, &q->out_chunk_list);
q->out_qlen += ch->skb->len;
+
+ stream = sctp_chunk_stream_no(ch);
+ oute = q->asoc->stream.out[stream].ext;
+ list_add(&ch->stream_list, &oute->outq);
}
/* Take data from the front of the queue. */
static inline struct sctp_chunk *sctp_outq_dequeue_data(struct sctp_outq *q)
{
- struct sctp_chunk *ch = NULL;
-
- if (!list_empty(&q->out_chunk_list)) {
- struct list_head *entry = q->out_chunk_list.next;
-
- ch = list_entry(entry, struct sctp_chunk, list);
- list_del_init(entry);
- q->out_qlen -= ch->skb->len;
- }
- return ch;
+ return q->sched->dequeue(q);
}
+
/* Add data chunk to the end of the queue. */
static inline void sctp_outq_tail_data(struct sctp_outq *q,
struct sctp_chunk *ch)
{
+ struct sctp_stream_out_ext *oute;
+ __u16 stream;
+
list_add_tail(&ch->list, &q->out_chunk_list);
q->out_qlen += ch->skb->len;
+
+ stream = sctp_chunk_stream_no(ch);
+ oute = q->asoc->stream.out[stream].ext;
+ list_add_tail(&ch->stream_list, &oute->outq);
}
/*
@@ -207,6 +214,7 @@ void sctp_outq_init(struct sctp_association *asoc, struct sctp_outq *q)
INIT_LIST_HEAD(&q->retransmit);
INIT_LIST_HEAD(&q->sacked);
INIT_LIST_HEAD(&q->abandoned);
+ sctp_sched_set_sched(asoc, SCTP_SS_FCFS);
}
/* Free the outqueue structure and any related pending chunks.
@@ -258,6 +266,7 @@ static void __sctp_outq_teardown(struct sctp_outq *q)
/* Throw away any leftover data chunks. */
while ((chunk = sctp_outq_dequeue_data(q)) != NULL) {
+ sctp_sched_dequeue_done(q, chunk);
/* Mark as send failure. */
sctp_chunk_fail(chunk, q->error);
@@ -391,13 +400,14 @@ static int sctp_prsctp_prune_unsent(struct sctp_association *asoc,
struct sctp_outq *q = &asoc->outqueue;
struct sctp_chunk *chk, *temp;
+ q->sched->unsched_all(&asoc->stream);
+
list_for_each_entry_safe(chk, temp, &q->out_chunk_list, list) {
if (!SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
chk->sinfo.sinfo_timetolive <= sinfo->sinfo_timetolive)
continue;
- list_del_init(&chk->list);
- q->out_qlen -= chk->skb->len;
+ sctp_sched_dequeue_common(q, chk);
asoc->sent_cnt_removable--;
asoc->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++;
if (chk->sinfo.sinfo_stream < asoc->stream.outcnt) {
@@ -415,6 +425,8 @@ static int sctp_prsctp_prune_unsent(struct sctp_association *asoc,
break;
}
+ q->sched->sched_all(&asoc->stream);
+
return msg_len;
}
@@ -1033,22 +1045,9 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
while ((chunk = sctp_outq_dequeue_data(q)) != NULL) {
__u32 sid = ntohs(chunk->subh.data_hdr->stream);
- /* RFC 2960 6.5 Every DATA chunk MUST carry a valid
- * stream identifier.
- */
- if (chunk->sinfo.sinfo_stream >= asoc->stream.outcnt) {
-
- /* Mark as failed send. */
- sctp_chunk_fail(chunk, SCTP_ERROR_INV_STRM);
- if (asoc->peer.prsctp_capable &&
- SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
- asoc->sent_cnt_removable--;
- sctp_chunk_free(chunk);
- continue;
- }
-
/* Has this chunk expired? */
if (sctp_chunk_abandoned(chunk)) {
+ sctp_sched_dequeue_done(q, chunk);
sctp_chunk_fail(chunk, 0);
sctp_chunk_free(chunk);
continue;
@@ -1070,6 +1069,7 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
new_transport = asoc->peer.active_path;
if (new_transport->state == SCTP_UNCONFIRMED) {
WARN_ONCE(1, "Attempt to send packet on unconfirmed path.");
+ sctp_sched_dequeue_done(q, chunk);
sctp_chunk_fail(chunk, 0);
sctp_chunk_free(chunk);
continue;
@@ -1133,6 +1133,11 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
else
asoc->stats.oodchunks++;
+ /* Only now it's safe to consider this
+ * chunk as sent, sched-wise.
+ */
+ sctp_sched_dequeue_done(q, chunk);
+
break;
default:
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index e6a2974e020e..402bfbb888cd 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -50,6 +50,7 @@
#include
#include
#include
+#include
static int sctp_cmd_interpreter(enum sctp_event event_type,
union sctp_subtype subtype,
@@ -1089,6 +1090,8 @@ static void sctp_cmd_send_msg(struct sctp_association *asoc,
list_for_each_entry(chunk, &msg->chunks, frag_list)
sctp_outq_tail(&asoc->outqueue, chunk, gfp);
+
+ asoc->outqueue.sched->enqueue(&asoc->outqueue, msg);
}
diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index 055ca25bbc91..5ea33a2c453b 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -32,8 +32,61 @@
* Xin Long
*/
+#include
#include
#include
+#include
+
+/* Migrates chunks from stream queues to new stream queues if needed,
+ * but not across associations. Also, removes those chunks to streams
+ * higher than the new max.
+ */
+static void sctp_stream_outq_migrate(struct sctp_stream *stream,
+ struct sctp_stream *new, __u16 outcnt)
+{
+ struct sctp_association *asoc;
+ struct sctp_chunk *ch, *temp;
+ struct sctp_outq *outq;
+ int i;
+
+ asoc = container_of(stream, struct sctp_association, stream);
+ outq = &asoc->outqueue;
+
+ list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
+ __u16 sid = sctp_chunk_stream_no(ch);
+
+ if (sid < outcnt)
+ continue;
+
+ sctp_sched_dequeue_common(outq, ch);
+ /* No need to call dequeue_done here because
+ * the chunks are not scheduled by now.
+ */
+
+ /* Mark as failed send. */
+ sctp_chunk_fail(ch, SCTP_ERROR_INV_STRM);
+ if (asoc->peer.prsctp_capable &&
+ SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
+ asoc->sent_cnt_removable--;
+
+ sctp_chunk_free(ch);
+ }
+
+ if (new) {
+ /* Here we actually move the old ext stuff into the new
+ * buffer, because we want to keep it. Then
+ * sctp_stream_update will swap ->out pointers.
+ */
+ for (i = 0; i < outcnt; i++) {
+ kfree(new->out[i].ext);
+ new->out[i].ext = stream->out[i].ext;
+ stream->out[i].ext = NULL;
+ }
+ }
+
+ for (i = outcnt; i < stream->outcnt; i++)
+ kfree(stream->out[i].ext);
+}
static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
gfp_t gfp)
@@ -87,7 +140,8 @@ static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
gfp_t gfp)
{
- int i;
+ struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
+ int i, ret = 0;
gfp |= __GFP_NOWARN;
@@ -97,6 +151,11 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
if (outcnt == stream->outcnt)
goto in;
+ /* Filter out chunks queued on streams that won't exist anymore */
+ sched->unsched_all(stream);
+ sctp_stream_outq_migrate(stream, NULL, outcnt);
+ sched->sched_all(stream);
+
i = sctp_stream_alloc_out(stream, outcnt, gfp);
if (i)
return i;
@@ -105,20 +164,27 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_OPEN;
+ sched->init(stream);
+
in:
if (!incnt)
- return 0;
+ goto out;
i = sctp_stream_alloc_in(stream, incnt, gfp);
if (i) {
- kfree(stream->out);
- stream->out = NULL;
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto free;
}
stream->incnt = incnt;
+ goto out;
- return 0;
+free:
+ sched->free(stream);
+ kfree(stream->out);
+ stream->out = NULL;
+out:
+ return ret;
}
int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
@@ -130,13 +196,15 @@ int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
return -ENOMEM;
stream->out[sid].ext = soute;
- return 0;
+ return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
}
void sctp_stream_free(struct sctp_stream *stream)
{
+ struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
int i;
+ sched->free(stream);
for (i = 0; i < stream->outcnt; i++)
kfree(stream->out[i].ext);
kfree(stream->out);
@@ -156,6 +224,10 @@ void sctp_stream_clear(struct sctp_stream *stream)
void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
{
+ struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
+
+ sched->unsched_all(stream);
+ sctp_stream_outq_migrate(stream, new, new->outcnt);
sctp_stream_free(stream);
stream->out = new->out;
@@ -163,6 +235,8 @@ void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
stream->outcnt = new->outcnt;
stream->incnt = new->incnt;
+ sched->sched_all(stream);
+
new->out = NULL;
new->in = NULL;
}
diff --git a/net/sctp/stream_sched.c b/net/sctp/stream_sched.c
new file mode 100644
index 000000000000..40a9a9de2b98
--- /dev/null
+++ b/net/sctp/stream_sched.c
@@ -0,0 +1,270 @@
+/* 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.
+ *
+ * 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
+ * .
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresched(es):
+ * lksctp developers
+ *
+ * Written or modified by:
+ * Marcelo Ricardo Leitner
+ */
+
+#include
+#include
+#include
+#include
+
+/* First Come First Serve (a.k.a. FIFO)
+ * RFC DRAFT ndata Section 3.1
+ */
+static int sctp_sched_fcfs_set(struct sctp_stream *stream, __u16 sid,
+ __u16 value, gfp_t gfp)
+{
+ return 0;
+}
+
+static int sctp_sched_fcfs_get(struct sctp_stream *stream, __u16 sid,
+ __u16 *value)
+{
+ *value = 0;
+ return 0;
+}
+
+static int sctp_sched_fcfs_init(struct sctp_stream *stream)
+{
+ return 0;
+}
+
+static int sctp_sched_fcfs_init_sid(struct sctp_stream *stream, __u16 sid,
+ gfp_t gfp)
+{
+ return 0;
+}
+
+static void sctp_sched_fcfs_free(struct sctp_stream *stream)
+{
+}
+
+static void sctp_sched_fcfs_enqueue(struct sctp_outq *q,
+ struct sctp_datamsg *msg)
+{
+}
+
+static struct sctp_chunk *sctp_sched_fcfs_dequeue(struct sctp_outq *q)
+{
+ struct sctp_stream *stream = &q->asoc->stream;
+ struct sctp_chunk *ch = NULL;
+ struct list_head *entry;
+
+ if (list_empty(&q->out_chunk_list))
+ goto out;
+
+ if (stream->out_curr) {
+ ch = list_entry(stream->out_curr->ext->outq.next,
+ struct sctp_chunk, stream_list);
+ } else {
+ entry = q->out_chunk_list.next;
+ ch = list_entry(entry, struct sctp_chunk, list);
+ }
+
+ sctp_sched_dequeue_common(q, ch);
+
+out:
+ return ch;
+}
+
+static void sctp_sched_fcfs_dequeue_done(struct sctp_outq *q,
+ struct sctp_chunk *chunk)
+{
+}
+
+static void sctp_sched_fcfs_sched_all(struct sctp_stream *stream)
+{
+}
+
+static void sctp_sched_fcfs_unsched_all(struct sctp_stream *stream)
+{
+}
+
+static struct sctp_sched_ops sctp_sched_fcfs = {
+ .set = sctp_sched_fcfs_set,
+ .get = sctp_sched_fcfs_get,
+ .init = sctp_sched_fcfs_init,
+ .init_sid = sctp_sched_fcfs_init_sid,
+ .free = sctp_sched_fcfs_free,
+ .enqueue = sctp_sched_fcfs_enqueue,
+ .dequeue = sctp_sched_fcfs_dequeue,
+ .dequeue_done = sctp_sched_fcfs_dequeue_done,
+ .sched_all = sctp_sched_fcfs_sched_all,
+ .unsched_all = sctp_sched_fcfs_unsched_all,
+};
+
+/* API to other parts of the stack */
+
+struct sctp_sched_ops *sctp_sched_ops[] = {
+ &sctp_sched_fcfs,
+};
+
+int sctp_sched_set_sched(struct sctp_association *asoc,
+ enum sctp_sched_type sched)
+{
+ struct sctp_sched_ops *n = sctp_sched_ops[sched];
+ struct sctp_sched_ops *old = asoc->outqueue.sched;
+ struct sctp_datamsg *msg = NULL;
+ struct sctp_chunk *ch;
+ int i, ret = 0;
+
+ if (old == n)
+ return ret;
+
+ if (sched > SCTP_SS_MAX)
+ return -EINVAL;
+
+ if (old) {
+ old->free(&asoc->stream);
+
+ /* Give the next scheduler a clean slate. */
+ for (i = 0; i < asoc->stream.outcnt; i++) {
+ void *p = asoc->stream.out[i].ext;
+
+ if (!p)
+ continue;
+
+ p += offsetofend(struct sctp_stream_out_ext, outq);
+ memset(p, 0, sizeof(struct sctp_stream_out_ext) -
+ offsetofend(struct sctp_stream_out_ext, outq));
+ }
+ }
+
+ asoc->outqueue.sched = n;
+ n->init(&asoc->stream);
+ for (i = 0; i < asoc->stream.outcnt; i++) {
+ if (!asoc->stream.out[i].ext)
+ continue;
+
+ ret = n->init_sid(&asoc->stream, i, GFP_KERNEL);
+ if (ret)
+ goto err;
+ }
+
+ /* We have to requeue all chunks already queued. */
+ list_for_each_entry(ch, &asoc->outqueue.out_chunk_list, list) {
+ if (ch->msg == msg)
+ continue;
+ msg = ch->msg;
+ n->enqueue(&asoc->outqueue, msg);
+ }
+
+ return ret;
+
+err:
+ n->free(&asoc->stream);
+ asoc->outqueue.sched = &sctp_sched_fcfs; /* Always safe */
+
+ return ret;
+}
+
+int sctp_sched_get_sched(struct sctp_association *asoc)
+{
+ int i;
+
+ for (i = 0; i <= SCTP_SS_MAX; i++)
+ if (asoc->outqueue.sched == sctp_sched_ops[i])
+ return i;
+
+ return 0;
+}
+
+int sctp_sched_set_value(struct sctp_association *asoc, __u16 sid,
+ __u16 value, gfp_t gfp)
+{
+ if (sid >= asoc->stream.outcnt)
+ return -EINVAL;
+
+ if (!asoc->stream.out[sid].ext) {
+ int ret;
+
+ ret = sctp_stream_init_ext(&asoc->stream, sid);
+ if (ret)
+ return ret;
+ }
+
+ return asoc->outqueue.sched->set(&asoc->stream, sid, value, gfp);
+}
+
+int sctp_sched_get_value(struct sctp_association *asoc, __u16 sid,
+ __u16 *value)
+{
+ if (sid >= asoc->stream.outcnt)
+ return -EINVAL;
+
+ if (!asoc->stream.out[sid].ext)
+ return 0;
+
+ return asoc->outqueue.sched->get(&asoc->stream, sid, value);
+}
+
+void sctp_sched_dequeue_done(struct sctp_outq *q, struct sctp_chunk *ch)
+{
+ if (!list_is_last(&ch->frag_list, &ch->msg->chunks)) {
+ struct sctp_stream_out *sout;
+ __u16 sid;
+
+ /* datamsg is not finish, so save it as current one,
+ * in case application switch scheduler or a higher
+ * priority stream comes in.
+ */
+ sid = sctp_chunk_stream_no(ch);
+ sout = &q->asoc->stream.out[sid];
+ q->asoc->stream.out_curr = sout;
+ return;
+ }
+
+ q->asoc->stream.out_curr = NULL;
+ q->sched->dequeue_done(q, ch);
+}
+
+/* Auxiliary functions for the schedulers */
+void sctp_sched_dequeue_common(struct sctp_outq *q, struct sctp_chunk *ch)
+{
+ list_del_init(&ch->list);
+ list_del_init(&ch->stream_list);
+ q->out_qlen -= ch->skb->len;
+}
+
+int sctp_sched_init_sid(struct sctp_stream *stream, __u16 sid, gfp_t gfp)
+{
+ struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
+
+ INIT_LIST_HEAD(&stream->out[sid].ext->outq);
+ return sched->init_sid(stream, sid, gfp);
+}
+
+struct sctp_sched_ops *sctp_sched_ops_from_stream(struct sctp_stream *stream)
+{
+ struct sctp_association *asoc;
+
+ asoc = container_of(stream, struct sctp_association, stream);
+
+ return asoc->outqueue.sched;
+}