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net: reimplement softnet_data.output_queue as a FIFO queue

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reimplement softnet_data.output_queue as a FIFO queue to keep the
fairness among the qdiscs rescheduled.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
----
 include/linux/netdevice.h |    1 +
 net/core/dev.c            |   22 ++++++++++++----------
 2 files changed, 13 insertions(+), 10 deletions(-)
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Changli Gao 2010-04-26 23:06:24 +00:00 committed by David S. Miller
parent bb61187465
commit a9cbd588fd
2 changed files with 13 additions and 10 deletions
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1
include/linux/netdevice.h
View file

@ -1385,6 +1385,7 @@ static inline int unregister_gifconf(unsigned int family)
*/
struct softnet_data {
struct Qdisc *output_queue;
struct Qdisc **output_queue_tailp;
struct list_head poll_list;
struct sk_buff *completion_queue;

22
net/core/dev.c
View file

@ -1557,8 +1557,9 @@ static inline void __netif_reschedule(struct Qdisc *q)
local_irq_save(flags);
sd = &__get_cpu_var(softnet_data);
q->next_sched = sd->output_queue;
sd->output_queue = q;
q->next_sched = NULL;
*sd->output_queue_tailp = q;
sd->output_queue_tailp = &q->next_sched;
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
}
@ -2529,6 +2530,7 @@ static void net_tx_action(struct softirq_action *h)
local_irq_disable();
head = sd->output_queue;
sd->output_queue = NULL;
sd->output_queue_tailp = &sd->output_queue;
local_irq_enable();
while (head) {
@ -5594,7 +5596,6 @@ static int dev_cpu_callback(struct notifier_block *nfb,
void *ocpu)
{
struct sk_buff **list_skb;
struct Qdisc **list_net;
struct sk_buff *skb;
unsigned int cpu, oldcpu = (unsigned long)ocpu;
struct softnet_data *sd, *oldsd;
@ -5615,13 +5616,13 @@ static int dev_cpu_callback(struct notifier_block *nfb,
*list_skb = oldsd->completion_queue;
oldsd->completion_queue = NULL;
/* Find end of our output_queue. */
list_net = &sd->output_queue;
while (*list_net)
list_net = &(*list_net)->next_sched;
/* Append output queue from offline CPU. */
*list_net = oldsd->output_queue;
oldsd->output_queue = NULL;
if (oldsd->output_queue) {
*sd->output_queue_tailp = oldsd->output_queue;
sd->output_queue_tailp = oldsd->output_queue_tailp;
oldsd->output_queue = NULL;
oldsd->output_queue_tailp = &oldsd->output_queue;
}
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_enable();
@ -5851,7 +5852,8 @@ static int __init net_dev_init(void)
skb_queue_head_init(&sd->input_pkt_queue);
sd->completion_queue = NULL;
INIT_LIST_HEAD(&sd->poll_list);
sd->output_queue = NULL;
sd->output_queue_tailp = &sd->output_queue;
#ifdef CONFIG_RPS
sd->csd.func = rps_trigger_softirq;
sd->csd.info = sd;