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Date: Wed, 2 Jun 2010 22:42:48 -0700
From: Yaogong Wang <ywang15@...u.edu>
To: linux-sctp@...r.kernel.org,
Vlad Yasevich <vladislav.yasevich@...com>,
Sridhar Samudrala <sri@...ibm.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 6/6] sctp multistream scheduling: a sample weighted fair queue
scheduling module
A sample weighted fair queue scheduling module that uses our interface
Signed-off-by: Yaogong Wang <ywang15@...u.edu>
---
diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
p5/include/net/sctp/structs.h p6/include/net/sctp/structs.h
--- p5/include/net/sctp/structs.h 2010-06-02 12:58:41.000000000 -0700
+++ p6/include/net/sctp/structs.h 2010-05-28 15:09:31.000000000 -0700
@@ -1693,6 +1693,7 @@ struct sctp_association {
/* Multistream scheduling */
const struct sctp_sched_ops *sched_ops;
+ __u16 *sched_internal;
__u32 sched_priv_len;
__u16 *sched_priv;
diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
p5/net/sctp/Kconfig p6/net/sctp/Kconfig
--- p5/net/sctp/Kconfig 2010-05-28 14:43:17.000000000 -0700
+++ p6/net/sctp/Kconfig 2010-05-28 15:10:30.000000000 -0700
@@ -43,6 +43,12 @@ config SCTP_SCHED_PRIO
help
Use priority queue to schedule among multiple streams
+config SCTP_SCHED_WFQ
+ tristate "SCTP Multistream Scheduling: Weighted Fair Queue"
+ default m
+ help
+ Use weighted fair queue to schedule among multiple streams
+
config SCTP_DBG_MSG
bool "SCTP: Debug messages"
help
diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
p5/net/sctp/Makefile p6/net/sctp/Makefile
--- p5/net/sctp/Makefile 2010-05-28 14:48:08.000000000 -0700
+++ p6/net/sctp/Makefile 2010-05-28 15:11:02.000000000 -0700
@@ -12,6 +12,7 @@ sctp-y := sm_statetable.o sm_statefuns.o
output.o input.o debug.o ssnmap.o auth.o sched.o
obj-$(CONFIG_SCTP_SCHED_PRIO) += sctp_prio.o
+obj-$(CONFIG_SCTP_SCHED_WFQ) += sctp_wfq.o
sctp-$(CONFIG_SCTP_DBG_OBJCNT) += objcnt.o
sctp-$(CONFIG_PROC_FS) += proc.o
sctp-$(CONFIG_SYSCTL) += sysctl.o
diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
p5/net/sctp/associola.c p6/net/sctp/associola.c
--- p5/net/sctp/associola.c 2010-06-02 12:58:27.000000000 -0700
+++ p6/net/sctp/associola.c 2010-05-28 15:09:37.000000000 -0700
@@ -195,6 +195,7 @@ static struct sctp_association *sctp_ass
memcpy(asoc->sched_priv, sp->sched_priv, asoc->sched_priv_len);
} else
asoc->sched_priv = NULL;
+ asoc->sched_internal = NULL;
/* Allocate storage for the ssnmap after the inbound and outbound
* streams have been negotiated during Init.
diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
p5/net/sctp/sctp_wfq.c p6/net/sctp/sctp_wfq.c
--- p5/net/sctp/sctp_wfq.c 1969-12-31 16:00:00.000000000 -0800
+++ p6/net/sctp/sctp_wfq.c 2010-06-02 13:10:05.000000000 -0700
@@ -0,0 +1,150 @@
+/*
+ * Weighted fair queue scheduling among multiple SCTP streams
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <net/sctp/sctp.h>
+
+static int quantum = 1500;
+module_param(quantum, int, 0644);
+MODULE_PARM_DESC(quantum, "quantum in bytes");
+
+/*
+ * Weighted fair queue internal data structure
+ *
+ * implemented using deficit round robin technique
+ */
+struct wfq {
+ __u16 rr_ptr;
+ __u16 deficit[0];
+};
+
+static int wfq_init(struct sctp_outq *q, gfp_t gfp)
+{
+ __u16 i;
+ struct wfq *internal;
+
+ /* initiate out_chunk_list */
+ q->out_chunk_list = kmalloc(q->asoc->c.sinit_num_ostreams
+ * sizeof(struct list_head), gfp);
+ if (!q->out_chunk_list)
+ return -ENOMEM;
+ for (i = 0; i < q->asoc->c.sinit_num_ostreams; i++)
+ INIT_LIST_HEAD(&q->out_chunk_list[i]);
+
+ /* initiate internal data structure */
+ q->asoc->sched_internal = kmalloc(q->asoc->sched_priv_len
+ + sizeof(__u16), gfp);
+ if (!q->asoc->sched_internal) {
+ kfree(q->out_chunk_list);
+ return -ENOMEM;
+ }
+ internal = (struct wfq *)q->asoc->sched_internal;
+ internal->rr_ptr = 0;
+ internal->deficit[0] = q->asoc->sched_priv[0] * quantum;
+ for (i = 1; i < q->asoc->c.sinit_num_ostreams; i++)
+ internal->deficit[i] = 0;
+
+ return 0;
+}
+
+static void wfq_release(struct sctp_outq *q)
+{
+ kfree(q->out_chunk_list);
+ kfree(q->asoc->sched_internal);
+ return;
+}
+
+static void wfq_enqueue_head_data(struct sctp_outq *q,
+ struct sctp_chunk *ch)
+{
+ list_add(&ch->list, &q->out_chunk_list[ch->sinfo.sinfo_stream]);
+ q->out_qlen += ch->skb->len;
+ return;
+}
+
+static void wfq_enqueue_tail_data(struct sctp_outq *q, struct sctp_chunk *ch)
+{
+ list_add_tail(&ch->list, &q->out_chunk_list[ch->sinfo.sinfo_stream]);
+ q->out_qlen += ch->skb->len;
+ return;
+}
+
+static struct sctp_chunk *wfq_dequeue_data(struct sctp_outq *q)
+{
+ struct sctp_chunk *ch = NULL;
+ struct wfq *internal = (struct wfq *)q->asoc->sched_internal;
+ __u16 i, cur = 0;
+ int flag = 0, hasdata = 0;
+
+ for (i = 0; i < q->asoc->c.sinit_num_ostreams || hasdata; i++) {
+ if (!list_empty(&q->out_chunk_list[internal->rr_ptr])) {
+ hasdata = 1;
+ struct list_head *tmp_entry =
+ q->out_chunk_list[internal->rr_ptr].next;
+ struct sctp_chunk *tmp_ch =
+ list_entry(tmp_entry, struct sctp_chunk, list);
+ if (tmp_ch->skb->len <=
+ internal->deficit[internal->rr_ptr]) {
+ internal->deficit[internal->rr_ptr] -=
+ tmp_ch->skb->len;
+ cur = internal->rr_ptr;
+ flag = 1;
+ break;
+ }
+ } else {
+ internal->deficit[internal->rr_ptr] = 0;
+ }
+ internal->rr_ptr = (internal->rr_ptr + 1)
+ % q->asoc->c.sinit_num_ostreams;
+ internal->deficit[internal->rr_ptr] +=
+ q->asoc->sched_priv[internal->rr_ptr] * quantum;
+ }
+
+ if (flag) {
+ struct list_head *entry = q->out_chunk_list[cur].next;
+ ch = list_entry(entry, struct sctp_chunk, list);
+ list_del_init(entry);
+ q->out_qlen -= ch->skb->len;
+ }
+ return ch;
+}
+
+static inline int wfq_is_empty(struct sctp_outq *q)
+{
+ __u16 i;
+ for (i = 0; i < q->asoc->c.sinit_num_ostreams; i++)
+ if (!list_empty(&q->out_chunk_list[i]))
+ return 0;
+ return 1;
+}
+
+static struct sctp_sched_ops sctp_wfq = {
+ .name = "wfq",
+ .owner = THIS_MODULE,
+ .init = wfq_init,
+ .release = wfq_release,
+ .enqueue_head_data = wfq_enqueue_head_data,
+ .enqueue_tail_data = wfq_enqueue_tail_data,
+ .dequeue_data = wfq_dequeue_data,
+ .is_empty = wfq_is_empty,
+};
+
+static int __init sctp_wfq_register(void)
+{
+ return sctp_register_sched(&sctp_wfq);
+}
+
+static void __exit sctp_wfq_unregister(void)
+{
+ sctp_unregister_sched(&sctp_wfq);
+}
+
+module_init(sctp_wfq_register);
+module_exit(sctp_wfq_unregister);
+
+MODULE_AUTHOR("Yaogong Wang");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SCTP Multistream Scheduling: Weighted Fair Queue");
--
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