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net: add softnet_data.in_net_rx_action 

We want to make two optimizations in napi_schedule_rps() and
____napi_schedule() which require to know if these helpers are
called from net_rx_action(), instead of being called from
other contexts.

sd.in_net_rx_action is only read/written by the owning cpu.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Tested-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2023-03-28 23:50:19 +00:00 committed by Paolo Abeni
parent 8fcb76b934
commit c59647c0dc
2 changed files with 5 additions and 0 deletions
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1
include/linux/netdevice.h
View File

@ -3188,6 +3188,7 @@ struct softnet_data {
#ifdef CONFIG_RPS
struct softnet_data *rps_ipi_list;
#endif
bool in_net_rx_action;
#ifdef CONFIG_NET_FLOW_LIMIT
struct sd_flow_limit __rcu *flow_limit;
#endif

4
net/core/dev.c
View File

@ -6646,6 +6646,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
LIST_HEAD(list);
LIST_HEAD(repoll);
sd->in_net_rx_action = true;
local_irq_disable();
list_splice_init(&sd->poll_list, &list);
local_irq_enable();
@ -6656,6 +6657,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
skb_defer_free_flush(sd);
if (list_empty(&list)) {
sd->in_net_rx_action = false;
if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
goto end;
break;
@ -6682,6 +6684,8 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
list_splice(&list, &sd->poll_list);
if (!list_empty(&sd->poll_list))
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
else
sd->in_net_rx_action = false;
net_rps_action_and_irq_enable(sd);
end:;