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net: Busy polling should ignore sender CPUs

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This patch is a cleanup/fix for NAPI IDs following the changes that made it
so that sender_cpu and napi_id were doing a better job of sharing the same
location in the sk_buff.

One issue I found is that we weren't validating the napi_id as being valid
before we started trying to setup the busy polling.  This change corrects
that by using the MIN_NAPI_ID value that is now used in both allocating the
NAPI IDs, as well as validating them.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2017-03-24 10:07:53 -07:00
committed by David S. Miller
parent dcb421f427
commit 545cd5e5ec
2 changed files with 16 additions and 6 deletions
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9
include/net/busy_poll.h
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@@ -35,6 +35,12 @@ struct napi_struct;
extern unsigned int sysctl_net_busy_read __read_mostly;
extern unsigned int sysctl_net_busy_poll __read_mostly;
/* 0 - Reserved to indicate value not set
* 1..NR_CPUS - Reserved for sender_cpu
* NR_CPUS+1..~0 - Region available for NAPI IDs
*/
#define MIN_NAPI_ID ((unsigned int)(NR_CPUS + 1))
static inline bool net_busy_loop_on(void)
{
return sysctl_net_busy_poll;
@@ -58,10 +64,9 @@ static inline unsigned long busy_loop_end_time(void)
static inline bool sk_can_busy_loop(const struct sock *sk)
{
return sk->sk_ll_usec && sk->sk_napi_id && !signal_pending(current);
return sk->sk_ll_usec && !signal_pending(current);
}
static inline bool busy_loop_timeout(unsigned long end_time)
{
unsigned long now = busy_loop_us_clock();