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42d452e770
As it says in rfc8260#section-3.6 about the weighted fair queueing scheduler: A Weighted Fair Queueing scheduler between the streams is used. The weight is configurable per outgoing SCTP stream. This scheduler considers the lengths of the messages of each stream and schedules them in a specific way to use the capacity according to the given weights. If the weight of stream S1 is n times the weight of stream S2, the scheduler should assign to stream S1 n times the capacity it assigns to stream S2. The details are implementation dependent. Interleaving user messages allows for a better realization of the capacity usage according to the given weights. This patch adds Weighted Fair Queueing Scheduler actually based on the code of Fair Capacity Scheduler by adding fc_weight into struct sctp_stream_out_ext and taking it into account when sorting stream-> fc_list in sctp_sched_fc_sched() and sctp_sched_fc_dequeue_done(). Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* SCTP kernel implementation
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* (C) Copyright Red Hat Inc. 2017
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*
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* These are definitions used by the stream schedulers, defined in RFC
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* draft ndata (https://tools.ietf.org/html/draft-ietf-tsvwg-sctp-ndata-11)
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*
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* Please send any bug reports or fixes you make to the
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* email addresses:
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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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#ifndef __sctp_stream_sched_h__
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#define __sctp_stream_sched_h__
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struct sctp_sched_ops {
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/* Property handling for a given stream */
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int (*set)(struct sctp_stream *stream, __u16 sid, __u16 value,
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gfp_t gfp);
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int (*get)(struct sctp_stream *stream, __u16 sid, __u16 *value);
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/* Init the specific scheduler */
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int (*init)(struct sctp_stream *stream);
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/* Init a stream */
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int (*init_sid)(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
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/* free a stream */
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void (*free_sid)(struct sctp_stream *stream, __u16 sid);
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/* Enqueue a chunk */
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void (*enqueue)(struct sctp_outq *q, struct sctp_datamsg *msg);
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/* Dequeue a chunk */
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struct sctp_chunk *(*dequeue)(struct sctp_outq *q);
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/* Called only if the chunk fit the packet */
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void (*dequeue_done)(struct sctp_outq *q, struct sctp_chunk *chunk);
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/* Sched all chunks already enqueued */
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void (*sched_all)(struct sctp_stream *steam);
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/* Unched all chunks already enqueued */
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void (*unsched_all)(struct sctp_stream *steam);
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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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int sctp_sched_get_sched(struct sctp_association *asoc);
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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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int sctp_sched_get_value(struct sctp_association *asoc, __u16 sid,
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__u16 *value);
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void sctp_sched_dequeue_done(struct sctp_outq *q, struct sctp_chunk *ch);
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void sctp_sched_dequeue_common(struct sctp_outq *q, struct sctp_chunk *ch);
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int sctp_sched_init_sid(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
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struct sctp_sched_ops *sctp_sched_ops_from_stream(struct sctp_stream *stream);
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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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void sctp_sched_ops_prio_init(void);
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void sctp_sched_ops_rr_init(void);
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void sctp_sched_ops_fc_init(void);
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void sctp_sched_ops_wfq_init(void);
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#endif /* __sctp_stream_sched_h__ */
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