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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ac1ed8b8 MRL |
2 | /* SCTP kernel implementation |
3 | * (C) Copyright Red Hat Inc. 2017 | |
4 | * | |
5 | * This file is part of the SCTP kernel implementation | |
6 | * | |
7 | * These functions manipulate sctp stream queue/scheduling. | |
8 | * | |
ac1ed8b8 MRL |
9 | * Please send any bug reports or fixes you make to the |
10 | * email addresched(es): | |
11 | * lksctp developers <linux-sctp@vger.kernel.org> | |
12 | * | |
13 | * Written or modified by: | |
14 | * Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> | |
15 | */ | |
16 | ||
17 | #include <linux/list.h> | |
18 | #include <net/sctp/sctp.h> | |
19 | #include <net/sctp/sm.h> | |
20 | #include <net/sctp/stream_sched.h> | |
21 | ||
22 | /* Priority handling | |
23 | * RFC DRAFT ndata section 3.2 | |
24 | */ | |
25 | static void sctp_sched_rr_unsched_all(struct sctp_stream *stream); | |
26 | ||
27 | static void sctp_sched_rr_next_stream(struct sctp_stream *stream) | |
28 | { | |
29 | struct list_head *pos; | |
30 | ||
31 | pos = stream->rr_next->rr_list.next; | |
32 | if (pos == &stream->rr_list) | |
33 | pos = pos->next; | |
34 | stream->rr_next = list_entry(pos, struct sctp_stream_out_ext, rr_list); | |
35 | } | |
36 | ||
37 | static void sctp_sched_rr_unsched(struct sctp_stream *stream, | |
38 | struct sctp_stream_out_ext *soute) | |
39 | { | |
40 | if (stream->rr_next == soute) | |
41 | /* Try to move to the next stream */ | |
42 | sctp_sched_rr_next_stream(stream); | |
43 | ||
44 | list_del_init(&soute->rr_list); | |
45 | ||
46 | /* If we have no other stream queued, clear next */ | |
47 | if (list_empty(&stream->rr_list)) | |
48 | stream->rr_next = NULL; | |
49 | } | |
50 | ||
51 | static void sctp_sched_rr_sched(struct sctp_stream *stream, | |
52 | struct sctp_stream_out_ext *soute) | |
53 | { | |
54 | if (!list_empty(&soute->rr_list)) | |
55 | /* Already scheduled. */ | |
56 | return; | |
57 | ||
58 | /* Schedule the stream */ | |
59 | list_add_tail(&soute->rr_list, &stream->rr_list); | |
60 | ||
61 | if (!stream->rr_next) | |
62 | stream->rr_next = soute; | |
63 | } | |
64 | ||
65 | static int sctp_sched_rr_set(struct sctp_stream *stream, __u16 sid, | |
66 | __u16 prio, gfp_t gfp) | |
67 | { | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static int sctp_sched_rr_get(struct sctp_stream *stream, __u16 sid, | |
72 | __u16 *value) | |
73 | { | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static int sctp_sched_rr_init(struct sctp_stream *stream) | |
78 | { | |
79 | INIT_LIST_HEAD(&stream->rr_list); | |
80 | stream->rr_next = NULL; | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static int sctp_sched_rr_init_sid(struct sctp_stream *stream, __u16 sid, | |
86 | gfp_t gfp) | |
87 | { | |
05364ca0 | 88 | INIT_LIST_HEAD(&SCTP_SO(stream, sid)->ext->rr_list); |
ac1ed8b8 MRL |
89 | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static void sctp_sched_rr_free(struct sctp_stream *stream) | |
94 | { | |
95 | sctp_sched_rr_unsched_all(stream); | |
96 | } | |
97 | ||
98 | static void sctp_sched_rr_enqueue(struct sctp_outq *q, | |
99 | struct sctp_datamsg *msg) | |
100 | { | |
101 | struct sctp_stream *stream; | |
102 | struct sctp_chunk *ch; | |
103 | __u16 sid; | |
104 | ||
105 | ch = list_first_entry(&msg->chunks, struct sctp_chunk, frag_list); | |
106 | sid = sctp_chunk_stream_no(ch); | |
107 | stream = &q->asoc->stream; | |
05364ca0 | 108 | sctp_sched_rr_sched(stream, SCTP_SO(stream, sid)->ext); |
ac1ed8b8 MRL |
109 | } |
110 | ||
111 | static struct sctp_chunk *sctp_sched_rr_dequeue(struct sctp_outq *q) | |
112 | { | |
113 | struct sctp_stream *stream = &q->asoc->stream; | |
114 | struct sctp_stream_out_ext *soute; | |
115 | struct sctp_chunk *ch = NULL; | |
116 | ||
117 | /* Bail out quickly if queue is empty */ | |
118 | if (list_empty(&q->out_chunk_list)) | |
119 | goto out; | |
120 | ||
121 | /* Find which chunk is next */ | |
122 | if (stream->out_curr) | |
123 | soute = stream->out_curr->ext; | |
124 | else | |
125 | soute = stream->rr_next; | |
126 | ch = list_entry(soute->outq.next, struct sctp_chunk, stream_list); | |
127 | ||
128 | sctp_sched_dequeue_common(q, ch); | |
129 | ||
130 | out: | |
131 | return ch; | |
132 | } | |
133 | ||
134 | static void sctp_sched_rr_dequeue_done(struct sctp_outq *q, | |
135 | struct sctp_chunk *ch) | |
136 | { | |
137 | struct sctp_stream_out_ext *soute; | |
138 | __u16 sid; | |
139 | ||
140 | /* Last chunk on that msg, move to the next stream */ | |
141 | sid = sctp_chunk_stream_no(ch); | |
05364ca0 | 142 | soute = SCTP_SO(&q->asoc->stream, sid)->ext; |
ac1ed8b8 MRL |
143 | |
144 | sctp_sched_rr_next_stream(&q->asoc->stream); | |
145 | ||
146 | if (list_empty(&soute->outq)) | |
147 | sctp_sched_rr_unsched(&q->asoc->stream, soute); | |
148 | } | |
149 | ||
150 | static void sctp_sched_rr_sched_all(struct sctp_stream *stream) | |
151 | { | |
152 | struct sctp_association *asoc; | |
153 | struct sctp_stream_out_ext *soute; | |
154 | struct sctp_chunk *ch; | |
155 | ||
156 | asoc = container_of(stream, struct sctp_association, stream); | |
157 | list_for_each_entry(ch, &asoc->outqueue.out_chunk_list, list) { | |
158 | __u16 sid; | |
159 | ||
160 | sid = sctp_chunk_stream_no(ch); | |
05364ca0 | 161 | soute = SCTP_SO(stream, sid)->ext; |
ac1ed8b8 MRL |
162 | if (soute) |
163 | sctp_sched_rr_sched(stream, soute); | |
164 | } | |
165 | } | |
166 | ||
167 | static void sctp_sched_rr_unsched_all(struct sctp_stream *stream) | |
168 | { | |
169 | struct sctp_stream_out_ext *soute, *tmp; | |
170 | ||
171 | list_for_each_entry_safe(soute, tmp, &stream->rr_list, rr_list) | |
172 | sctp_sched_rr_unsched(stream, soute); | |
173 | } | |
174 | ||
1ba896f6 | 175 | static struct sctp_sched_ops sctp_sched_rr = { |
ac1ed8b8 MRL |
176 | .set = sctp_sched_rr_set, |
177 | .get = sctp_sched_rr_get, | |
178 | .init = sctp_sched_rr_init, | |
179 | .init_sid = sctp_sched_rr_init_sid, | |
180 | .free = sctp_sched_rr_free, | |
181 | .enqueue = sctp_sched_rr_enqueue, | |
182 | .dequeue = sctp_sched_rr_dequeue, | |
183 | .dequeue_done = sctp_sched_rr_dequeue_done, | |
184 | .sched_all = sctp_sched_rr_sched_all, | |
185 | .unsched_all = sctp_sched_rr_unsched_all, | |
186 | }; | |
1ba896f6 XL |
187 | |
188 | void sctp_sched_ops_rr_init(void) | |
189 | { | |
190 | sctp_sched_ops_register(SCTP_SS_RR, &sctp_sched_rr); | |
191 | } |