luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Revert "pkt_sched: Make default qdisc nonshared-multiqueue safe."

Browse Source 
This reverts commit a0c80b80e0.

After discussions with Jamal and Herbert on netdev, we should
provide at least minimal prioritization at the qdisc level
even in multiqueue situations.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-07-21 09:56:13 -07:00
parent 867d79fb9a
commit d3678b463d
1 changed files with 78 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

101
net/sched/sch_generic.c
View File

@ -356,44 +356,99 @@ static struct Qdisc noqueue_qdisc = {
};
static int fifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc)
{
struct sk_buff_head *list = &qdisc->q;
static const u8 prio2band[TC_PRIO_MAX+1] =
{ 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 };
if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len)
/* 3-band FIFO queue: old style, but should be a bit faster than
generic prio+fifo combination.
*/
#define PFIFO_FAST_BANDS 3
static inline struct sk_buff_head *prio2list(struct sk_buff *skb,
struct Qdisc *qdisc)
{
struct sk_buff_head *list = qdisc_priv(qdisc);
return list + prio2band[skb->priority & TC_PRIO_MAX];
}
static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc)
{
struct sk_buff_head *list = prio2list(skb, qdisc);
if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) {
qdisc->q.qlen++;
return __qdisc_enqueue_tail(skb, qdisc, list);
}
return qdisc_drop(skb, qdisc);
}
static struct sk_buff *fifo_fast_dequeue(struct Qdisc* qdisc)
static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc)
{
struct sk_buff_head *list = &qdisc->q;
int prio;
struct sk_buff_head *list = qdisc_priv(qdisc);
if (!skb_queue_empty(list))
return __qdisc_dequeue_head(qdisc, list);
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
if (!skb_queue_empty(list + prio)) {
qdisc->q.qlen--;
return __qdisc_dequeue_head(qdisc, list + prio);
}
}
return NULL;
}
static int fifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
{
return __qdisc_requeue(skb, qdisc, &qdisc->q);
qdisc->q.qlen++;
return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc));
}
static void fifo_fast_reset(struct Qdisc* qdisc)
static void pfifo_fast_reset(struct Qdisc* qdisc)
{
__qdisc_reset_queue(qdisc, &qdisc->q);
int prio;
struct sk_buff_head *list = qdisc_priv(qdisc);
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
__qdisc_reset_queue(qdisc, list + prio);
qdisc->qstats.backlog = 0;
qdisc->q.qlen = 0;
}
static struct Qdisc_ops fifo_fast_ops __read_mostly = {
.id = "fifo_fast",
.priv_size = 0,
.enqueue = fifo_fast_enqueue,
.dequeue = fifo_fast_dequeue,
.requeue = fifo_fast_requeue,
.reset = fifo_fast_reset,
static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb)
{
struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS };
memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1);
NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
return skb->len;
nla_put_failure:
return -1;
}
static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt)
{
int prio;
struct sk_buff_head *list = qdisc_priv(qdisc);
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
skb_queue_head_init(list + prio);
return 0;
}
static struct Qdisc_ops pfifo_fast_ops __read_mostly = {
.id = "pfifo_fast",
.priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head),
.enqueue = pfifo_fast_enqueue,
.dequeue = pfifo_fast_dequeue,
.requeue = pfifo_fast_requeue,
.init = pfifo_fast_init,
.reset = pfifo_fast_reset,
.dump = pfifo_fast_dump,
.owner = THIS_MODULE,
};
@ -522,7 +577,7 @@ static void attach_one_default_qdisc(struct net_device *dev,
if (dev->tx_queue_len) {
qdisc = qdisc_create_dflt(dev, dev_queue,
&fifo_fast_ops, TC_H_ROOT);
&pfifo_fast_ops, TC_H_ROOT);
if (!qdisc) {
printk(KERN_INFO "%s: activation failed\n", dev->name);
return;
@ -550,9 +605,9 @@ void dev_activate(struct net_device *dev)
int need_watchdog;
/* No queueing discipline is attached to device;
* create default one i.e. fifo_fast for devices,
* which need queueing and noqueue_qdisc for
* virtual interfaces.
create default one i.e. pfifo_fast for devices,
which need queueing and noqueue_qdisc for
virtual interfaces
*/
if (dev_all_qdisc_sleeping_noop(dev))