Release 4.8 net/sched/sch_fifo.c
/*
* net/sched/sch_fifo.c The simplest FIFO queue.
*
* This program 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 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/pkt_sched.h>
/* 1 band FIFO pseudo-"scheduler" */
static int bfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff **to_free)
{
if (likely(sch->qstats.backlog + qdisc_pkt_len(skb) <= sch->limit))
return qdisc_enqueue_tail(skb, sch);
return qdisc_drop(skb, sch, to_free);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 39 | 65.00% | 2 | 22.22% |
| eric dumazet | eric dumazet | 9 | 15.00% | 2 | 22.22% |
| thomas graf | thomas graf | 6 | 10.00% | 2 | 22.22% |
| jussi kivilinna | jussi kivilinna | 3 | 5.00% | 1 | 11.11% |
| patrick mchardy | patrick mchardy | 2 | 3.33% | 1 | 11.11% |
| florian westphal | florian westphal | 1 | 1.67% | 1 | 11.11% |
| Total | 60 | 100.00% | 9 | 100.00% |
static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff **to_free)
{
if (likely(skb_queue_len(&sch->q) < sch->limit))
return qdisc_enqueue_tail(skb, sch);
return qdisc_drop(skb, sch, to_free);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 36 | 63.16% | 2 | 28.57% |
| thomas graf | thomas graf | 10 | 17.54% | 1 | 14.29% |
| eric dumazet | eric dumazet | 9 | 15.79% | 2 | 28.57% |
| patrick mchardy | patrick mchardy | 1 | 1.75% | 1 | 14.29% |
| florian westphal | florian westphal | 1 | 1.75% | 1 | 14.29% |
| Total | 57 | 100.00% | 7 | 100.00% |
static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff **to_free)
{
unsigned int prev_backlog;
if (likely(skb_queue_len(&sch->q) < sch->limit))
return qdisc_enqueue_tail(skb, sch);
prev_backlog = sch->qstats.backlog;
/* queue full, remove one skb to fulfill the limit */
__qdisc_queue_drop_head(sch, &sch->q, to_free);
qdisc_qstats_drop(sch);
qdisc_enqueue_tail(skb, sch);
qdisc_tree_reduce_backlog(sch, 0, prev_backlog - sch->qstats.backlog);
return NET_XMIT_CN;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| hagen paul pfeifer | hagen paul pfeifer | 57 | 55.88% | 1 | 16.67% |
| eric dumazet | eric dumazet | 42 | 41.18% | 4 | 66.67% |
| john fastabend | john fastabend | 3 | 2.94% | 1 | 16.67% |
| Total | 102 | 100.00% | 6 | 100.00% |
static int fifo_init(struct Qdisc *sch, struct nlattr *opt)
{
bool bypass;
bool is_bfifo = sch->ops == &bfifo_qdisc_ops;
if (opt == NULL) {
u32 limit = qdisc_dev(sch)->tx_queue_len;
if (is_bfifo)
limit *= psched_mtu(qdisc_dev(sch));
sch->limit = limit;
} else {
struct tc_fifo_qopt *ctl = nla_data(opt);
if (nla_len(opt) < sizeof(*ctl))
return -EINVAL;
sch->limit = ctl->limit;
}
if (is_bfifo)
bypass = sch->limit >= psched_mtu(qdisc_dev(sch));
else
bypass = sch->limit >= 1;
if (bypass)
sch->flags |= TCQ_F_CAN_BYPASS;
else
sch->flags &= ~TCQ_F_CAN_BYPASS;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 68 | 44.44% | 3 | 30.00% |
| eric dumazet | eric dumazet | 61 | 39.87% | 2 | 20.00% |
| patrick mchardy | patrick mchardy | 14 | 9.15% | 3 | 30.00% |
| david s. miller | david s. miller | 6 | 3.92% | 1 | 10.00% |
| thomas graf | thomas graf | 4 | 2.61% | 1 | 10.00% |
| Total | 153 | 100.00% | 10 | 100.00% |
static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct tc_fifo_qopt opt = { .limit = sch->limit };
if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
goto nla_put_failure;
return skb->len;
nla_put_failure:
return -1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 47 | 78.33% | 2 | 33.33% |
| david s. miller | david s. miller | 7 | 11.67% | 1 | 16.67% |
| thomas graf | thomas graf | 4 | 6.67% | 1 | 16.67% |
| patrick mchardy | patrick mchardy | 1 | 1.67% | 1 | 16.67% |
| eric dumazet | eric dumazet | 1 | 1.67% | 1 | 16.67% |
| Total | 60 | 100.00% | 6 | 100.00% |
struct Qdisc_ops pfifo_qdisc_ops __read_mostly = {
.id = "pfifo",
.priv_size = 0,
.enqueue = pfifo_enqueue,
.dequeue = qdisc_dequeue_head,
.peek = qdisc_peek_head,
.init = fifo_init,
.reset = qdisc_reset_queue,
.change = fifo_init,
.dump = fifo_dump,
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(pfifo_qdisc_ops);
struct Qdisc_ops bfifo_qdisc_ops __read_mostly = {
.id = "bfifo",
.priv_size = 0,
.enqueue = bfifo_enqueue,
.dequeue = qdisc_dequeue_head,
.peek = qdisc_peek_head,
.init = fifo_init,
.reset = qdisc_reset_queue,
.change = fifo_init,
.dump = fifo_dump,
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(bfifo_qdisc_ops);
struct Qdisc_ops pfifo_head_drop_qdisc_ops __read_mostly = {
.id = "pfifo_head_drop",
.priv_size = 0,
.enqueue = pfifo_tail_enqueue,
.dequeue = qdisc_dequeue_head,
.peek = qdisc_peek_head,
.init = fifo_init,
.reset = qdisc_reset_queue,
.change = fifo_init,
.dump = fifo_dump,
.owner = THIS_MODULE,
};
/* Pass size change message down to embedded FIFO */
int fifo_set_limit(struct Qdisc *q, unsigned int limit)
{
struct nlattr *nla;
int ret = -ENOMEM;
/* Hack to avoid sending change message to non-FIFO */
if (strncmp(q->ops->id + 1, "fifo", 4) != 0)
return 0;
nla = kmalloc(nla_attr_size(sizeof(struct tc_fifo_qopt)), GFP_KERNEL);
if (nla) {
nla->nla_type = RTM_NEWQDISC;
nla->nla_len = nla_attr_size(sizeof(struct tc_fifo_qopt));
((struct tc_fifo_qopt *)nla_data(nla))->limit = limit;
ret = q->ops->change(q, nla);
kfree(nla);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| patrick mchardy | patrick mchardy | 126 | 100.00% | 1 | 100.00% |
| Total | 126 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL(fifo_set_limit);
struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
unsigned int limit)
{
struct Qdisc *q;
int err = -ENOMEM;
q = qdisc_create_dflt(sch->dev_queue, ops, TC_H_MAKE(sch->handle, 1));
if (q) {
err = fifo_set_limit(q, limit);
if (err < 0) {
qdisc_destroy(q);
q = NULL;
}
}
return q ? : ERR_PTR(err);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| patrick mchardy | patrick mchardy | 89 | 95.70% | 1 | 50.00% |
| david s. miller | david s. miller | 4 | 4.30% | 1 | 50.00% |
| Total | 93 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL(fifo_create_dflt);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| patrick mchardy | patrick mchardy | 259 | 29.91% | 7 | 22.58% |
| pre-git | pre-git | 243 | 28.06% | 3 | 9.68% |
| eric dumazet | eric dumazet | 127 | 14.67% | 6 | 19.35% |
| hagen paul pfeifer | hagen paul pfeifer | 113 | 13.05% | 1 | 3.23% |
| dave jones | dave jones | 48 | 5.54% | 1 | 3.23% |
| david s. miller | david s. miller | 30 | 3.46% | 4 | 12.90% |
| thomas graf | thomas graf | 28 | 3.23% | 3 | 9.68% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 5 | 0.58% | 1 | 3.23% |
| tejun heo | tejun heo | 3 | 0.35% | 1 | 3.23% |
| john fastabend | john fastabend | 3 | 0.35% | 1 | 3.23% |
| jussi kivilinna | jussi kivilinna | 3 | 0.35% | 1 | 3.23% |
| linus torvalds | linus torvalds | 2 | 0.23% | 1 | 3.23% |
| florian westphal | florian westphal | 2 | 0.23% | 1 | 3.23% |
| Total | 866 | 100.00% | 31 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.