147505b8bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2ac1ed8b8SMarcelo Ricardo Leitner /* SCTP kernel implementation
3ac1ed8b8SMarcelo Ricardo Leitner * (C) Copyright Red Hat Inc. 2017
4ac1ed8b8SMarcelo Ricardo Leitner *
5ac1ed8b8SMarcelo Ricardo Leitner * This file is part of the SCTP kernel implementation
6ac1ed8b8SMarcelo Ricardo Leitner *
7ac1ed8b8SMarcelo Ricardo Leitner * These functions manipulate sctp stream queue/scheduling.
8ac1ed8b8SMarcelo Ricardo Leitner *
9ac1ed8b8SMarcelo Ricardo Leitner * Please send any bug reports or fixes you make to the
10ac1ed8b8SMarcelo Ricardo Leitner * email addresched(es):
11ac1ed8b8SMarcelo Ricardo Leitner * lksctp developers <linux-sctp@vger.kernel.org>
12ac1ed8b8SMarcelo Ricardo Leitner *
13ac1ed8b8SMarcelo Ricardo Leitner * Written or modified by:
14ac1ed8b8SMarcelo Ricardo Leitner * Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
15ac1ed8b8SMarcelo Ricardo Leitner */
16ac1ed8b8SMarcelo Ricardo Leitner
17ac1ed8b8SMarcelo Ricardo Leitner #include <linux/list.h>
18ac1ed8b8SMarcelo Ricardo Leitner #include <net/sctp/sctp.h>
19ac1ed8b8SMarcelo Ricardo Leitner #include <net/sctp/sm.h>
20ac1ed8b8SMarcelo Ricardo Leitner #include <net/sctp/stream_sched.h>
21ac1ed8b8SMarcelo Ricardo Leitner
22ac1ed8b8SMarcelo Ricardo Leitner /* Priority handling
23ac1ed8b8SMarcelo Ricardo Leitner * RFC DRAFT ndata section 3.2
24ac1ed8b8SMarcelo Ricardo Leitner */
25ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_unsched_all(struct sctp_stream *stream);
26ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_next_stream(struct sctp_stream * stream)27ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_next_stream(struct sctp_stream *stream)
28ac1ed8b8SMarcelo Ricardo Leitner {
29ac1ed8b8SMarcelo Ricardo Leitner struct list_head *pos;
30ac1ed8b8SMarcelo Ricardo Leitner
31ac1ed8b8SMarcelo Ricardo Leitner pos = stream->rr_next->rr_list.next;
32ac1ed8b8SMarcelo Ricardo Leitner if (pos == &stream->rr_list)
33ac1ed8b8SMarcelo Ricardo Leitner pos = pos->next;
34ac1ed8b8SMarcelo Ricardo Leitner stream->rr_next = list_entry(pos, struct sctp_stream_out_ext, rr_list);
35ac1ed8b8SMarcelo Ricardo Leitner }
36ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_unsched(struct sctp_stream * stream,struct sctp_stream_out_ext * soute)37ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_unsched(struct sctp_stream *stream,
38ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream_out_ext *soute)
39ac1ed8b8SMarcelo Ricardo Leitner {
40ac1ed8b8SMarcelo Ricardo Leitner if (stream->rr_next == soute)
41ac1ed8b8SMarcelo Ricardo Leitner /* Try to move to the next stream */
42ac1ed8b8SMarcelo Ricardo Leitner sctp_sched_rr_next_stream(stream);
43ac1ed8b8SMarcelo Ricardo Leitner
44ac1ed8b8SMarcelo Ricardo Leitner list_del_init(&soute->rr_list);
45ac1ed8b8SMarcelo Ricardo Leitner
46ac1ed8b8SMarcelo Ricardo Leitner /* If we have no other stream queued, clear next */
47ac1ed8b8SMarcelo Ricardo Leitner if (list_empty(&stream->rr_list))
48ac1ed8b8SMarcelo Ricardo Leitner stream->rr_next = NULL;
49ac1ed8b8SMarcelo Ricardo Leitner }
50ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_sched(struct sctp_stream * stream,struct sctp_stream_out_ext * soute)51ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_sched(struct sctp_stream *stream,
52ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream_out_ext *soute)
53ac1ed8b8SMarcelo Ricardo Leitner {
54ac1ed8b8SMarcelo Ricardo Leitner if (!list_empty(&soute->rr_list))
55ac1ed8b8SMarcelo Ricardo Leitner /* Already scheduled. */
56ac1ed8b8SMarcelo Ricardo Leitner return;
57ac1ed8b8SMarcelo Ricardo Leitner
58ac1ed8b8SMarcelo Ricardo Leitner /* Schedule the stream */
59ac1ed8b8SMarcelo Ricardo Leitner list_add_tail(&soute->rr_list, &stream->rr_list);
60ac1ed8b8SMarcelo Ricardo Leitner
61ac1ed8b8SMarcelo Ricardo Leitner if (!stream->rr_next)
62ac1ed8b8SMarcelo Ricardo Leitner stream->rr_next = soute;
63ac1ed8b8SMarcelo Ricardo Leitner }
64ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_set(struct sctp_stream * stream,__u16 sid,__u16 prio,gfp_t gfp)65ac1ed8b8SMarcelo Ricardo Leitner static int sctp_sched_rr_set(struct sctp_stream *stream, __u16 sid,
66ac1ed8b8SMarcelo Ricardo Leitner __u16 prio, gfp_t gfp)
67ac1ed8b8SMarcelo Ricardo Leitner {
68ac1ed8b8SMarcelo Ricardo Leitner return 0;
69ac1ed8b8SMarcelo Ricardo Leitner }
70ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_get(struct sctp_stream * stream,__u16 sid,__u16 * value)71ac1ed8b8SMarcelo Ricardo Leitner static int sctp_sched_rr_get(struct sctp_stream *stream, __u16 sid,
72ac1ed8b8SMarcelo Ricardo Leitner __u16 *value)
73ac1ed8b8SMarcelo Ricardo Leitner {
74ac1ed8b8SMarcelo Ricardo Leitner return 0;
75ac1ed8b8SMarcelo Ricardo Leitner }
76ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_init(struct sctp_stream * stream)77ac1ed8b8SMarcelo Ricardo Leitner static int sctp_sched_rr_init(struct sctp_stream *stream)
78ac1ed8b8SMarcelo Ricardo Leitner {
79ac1ed8b8SMarcelo Ricardo Leitner INIT_LIST_HEAD(&stream->rr_list);
80ac1ed8b8SMarcelo Ricardo Leitner stream->rr_next = NULL;
81ac1ed8b8SMarcelo Ricardo Leitner
82ac1ed8b8SMarcelo Ricardo Leitner return 0;
83ac1ed8b8SMarcelo Ricardo Leitner }
84ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_init_sid(struct sctp_stream * stream,__u16 sid,gfp_t gfp)85ac1ed8b8SMarcelo Ricardo Leitner static int sctp_sched_rr_init_sid(struct sctp_stream *stream, __u16 sid,
86ac1ed8b8SMarcelo Ricardo Leitner gfp_t gfp)
87ac1ed8b8SMarcelo Ricardo Leitner {
8805364ca0SKonstantin Khorenko INIT_LIST_HEAD(&SCTP_SO(stream, sid)->ext->rr_list);
89ac1ed8b8SMarcelo Ricardo Leitner
90ac1ed8b8SMarcelo Ricardo Leitner return 0;
91ac1ed8b8SMarcelo Ricardo Leitner }
92ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_free_sid(struct sctp_stream * stream,__u16 sid)93*9ed7bfc7SZhengchao Shao static void sctp_sched_rr_free_sid(struct sctp_stream *stream, __u16 sid)
94*9ed7bfc7SZhengchao Shao {
95*9ed7bfc7SZhengchao Shao }
96*9ed7bfc7SZhengchao Shao
sctp_sched_rr_enqueue(struct sctp_outq * q,struct sctp_datamsg * msg)97ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_enqueue(struct sctp_outq *q,
98ac1ed8b8SMarcelo Ricardo Leitner struct sctp_datamsg *msg)
99ac1ed8b8SMarcelo Ricardo Leitner {
100ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream *stream;
101ac1ed8b8SMarcelo Ricardo Leitner struct sctp_chunk *ch;
102ac1ed8b8SMarcelo Ricardo Leitner __u16 sid;
103ac1ed8b8SMarcelo Ricardo Leitner
104ac1ed8b8SMarcelo Ricardo Leitner ch = list_first_entry(&msg->chunks, struct sctp_chunk, frag_list);
105ac1ed8b8SMarcelo Ricardo Leitner sid = sctp_chunk_stream_no(ch);
106ac1ed8b8SMarcelo Ricardo Leitner stream = &q->asoc->stream;
10705364ca0SKonstantin Khorenko sctp_sched_rr_sched(stream, SCTP_SO(stream, sid)->ext);
108ac1ed8b8SMarcelo Ricardo Leitner }
109ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_dequeue(struct sctp_outq * q)110ac1ed8b8SMarcelo Ricardo Leitner static struct sctp_chunk *sctp_sched_rr_dequeue(struct sctp_outq *q)
111ac1ed8b8SMarcelo Ricardo Leitner {
112ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream *stream = &q->asoc->stream;
113ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream_out_ext *soute;
114ac1ed8b8SMarcelo Ricardo Leitner struct sctp_chunk *ch = NULL;
115ac1ed8b8SMarcelo Ricardo Leitner
116ac1ed8b8SMarcelo Ricardo Leitner /* Bail out quickly if queue is empty */
117ac1ed8b8SMarcelo Ricardo Leitner if (list_empty(&q->out_chunk_list))
118ac1ed8b8SMarcelo Ricardo Leitner goto out;
119ac1ed8b8SMarcelo Ricardo Leitner
120ac1ed8b8SMarcelo Ricardo Leitner /* Find which chunk is next */
121ac1ed8b8SMarcelo Ricardo Leitner if (stream->out_curr)
122ac1ed8b8SMarcelo Ricardo Leitner soute = stream->out_curr->ext;
123ac1ed8b8SMarcelo Ricardo Leitner else
124ac1ed8b8SMarcelo Ricardo Leitner soute = stream->rr_next;
125ac1ed8b8SMarcelo Ricardo Leitner ch = list_entry(soute->outq.next, struct sctp_chunk, stream_list);
126ac1ed8b8SMarcelo Ricardo Leitner
127ac1ed8b8SMarcelo Ricardo Leitner sctp_sched_dequeue_common(q, ch);
128ac1ed8b8SMarcelo Ricardo Leitner
129ac1ed8b8SMarcelo Ricardo Leitner out:
130ac1ed8b8SMarcelo Ricardo Leitner return ch;
131ac1ed8b8SMarcelo Ricardo Leitner }
132ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_dequeue_done(struct sctp_outq * q,struct sctp_chunk * ch)133ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_dequeue_done(struct sctp_outq *q,
134ac1ed8b8SMarcelo Ricardo Leitner struct sctp_chunk *ch)
135ac1ed8b8SMarcelo Ricardo Leitner {
136ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream_out_ext *soute;
137ac1ed8b8SMarcelo Ricardo Leitner __u16 sid;
138ac1ed8b8SMarcelo Ricardo Leitner
139ac1ed8b8SMarcelo Ricardo Leitner /* Last chunk on that msg, move to the next stream */
140ac1ed8b8SMarcelo Ricardo Leitner sid = sctp_chunk_stream_no(ch);
14105364ca0SKonstantin Khorenko soute = SCTP_SO(&q->asoc->stream, sid)->ext;
142ac1ed8b8SMarcelo Ricardo Leitner
143ac1ed8b8SMarcelo Ricardo Leitner sctp_sched_rr_next_stream(&q->asoc->stream);
144ac1ed8b8SMarcelo Ricardo Leitner
145ac1ed8b8SMarcelo Ricardo Leitner if (list_empty(&soute->outq))
146ac1ed8b8SMarcelo Ricardo Leitner sctp_sched_rr_unsched(&q->asoc->stream, soute);
147ac1ed8b8SMarcelo Ricardo Leitner }
148ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_sched_all(struct sctp_stream * stream)149ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_sched_all(struct sctp_stream *stream)
150ac1ed8b8SMarcelo Ricardo Leitner {
151ac1ed8b8SMarcelo Ricardo Leitner struct sctp_association *asoc;
152ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream_out_ext *soute;
153ac1ed8b8SMarcelo Ricardo Leitner struct sctp_chunk *ch;
154ac1ed8b8SMarcelo Ricardo Leitner
155ac1ed8b8SMarcelo Ricardo Leitner asoc = container_of(stream, struct sctp_association, stream);
156ac1ed8b8SMarcelo Ricardo Leitner list_for_each_entry(ch, &asoc->outqueue.out_chunk_list, list) {
157ac1ed8b8SMarcelo Ricardo Leitner __u16 sid;
158ac1ed8b8SMarcelo Ricardo Leitner
159ac1ed8b8SMarcelo Ricardo Leitner sid = sctp_chunk_stream_no(ch);
16005364ca0SKonstantin Khorenko soute = SCTP_SO(stream, sid)->ext;
161ac1ed8b8SMarcelo Ricardo Leitner if (soute)
162ac1ed8b8SMarcelo Ricardo Leitner sctp_sched_rr_sched(stream, soute);
163ac1ed8b8SMarcelo Ricardo Leitner }
164ac1ed8b8SMarcelo Ricardo Leitner }
165ac1ed8b8SMarcelo Ricardo Leitner
sctp_sched_rr_unsched_all(struct sctp_stream * stream)166ac1ed8b8SMarcelo Ricardo Leitner static void sctp_sched_rr_unsched_all(struct sctp_stream *stream)
167ac1ed8b8SMarcelo Ricardo Leitner {
168ac1ed8b8SMarcelo Ricardo Leitner struct sctp_stream_out_ext *soute, *tmp;
169ac1ed8b8SMarcelo Ricardo Leitner
170ac1ed8b8SMarcelo Ricardo Leitner list_for_each_entry_safe(soute, tmp, &stream->rr_list, rr_list)
171ac1ed8b8SMarcelo Ricardo Leitner sctp_sched_rr_unsched(stream, soute);
172ac1ed8b8SMarcelo Ricardo Leitner }
173ac1ed8b8SMarcelo Ricardo Leitner
1741ba896f6SXin Long static struct sctp_sched_ops sctp_sched_rr = {
175ac1ed8b8SMarcelo Ricardo Leitner .set = sctp_sched_rr_set,
176ac1ed8b8SMarcelo Ricardo Leitner .get = sctp_sched_rr_get,
177ac1ed8b8SMarcelo Ricardo Leitner .init = sctp_sched_rr_init,
178ac1ed8b8SMarcelo Ricardo Leitner .init_sid = sctp_sched_rr_init_sid,
179*9ed7bfc7SZhengchao Shao .free_sid = sctp_sched_rr_free_sid,
180ac1ed8b8SMarcelo Ricardo Leitner .enqueue = sctp_sched_rr_enqueue,
181ac1ed8b8SMarcelo Ricardo Leitner .dequeue = sctp_sched_rr_dequeue,
182ac1ed8b8SMarcelo Ricardo Leitner .dequeue_done = sctp_sched_rr_dequeue_done,
183ac1ed8b8SMarcelo Ricardo Leitner .sched_all = sctp_sched_rr_sched_all,
184ac1ed8b8SMarcelo Ricardo Leitner .unsched_all = sctp_sched_rr_unsched_all,
185ac1ed8b8SMarcelo Ricardo Leitner };
1861ba896f6SXin Long
sctp_sched_ops_rr_init(void)1871ba896f6SXin Long void sctp_sched_ops_rr_init(void)
1881ba896f6SXin Long {
1891ba896f6SXin Long sctp_sched_ops_register(SCTP_SS_RR, &sctp_sched_rr);
1901ba896f6SXin Long }
191