diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2017-03-24 20:07:53 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-25 06:49:30 +0300 |
| commit | 545cd5e5ec5477c325e4098b6fd21213dceda408 (patch) | |
| tree | 43a2aaa0f59d8721b8ab25d0f52749f798f42122 /include/net/busy_poll.h | |
| parent | dcb421f4279f362c3eef7479616c76588b74d782 (diff) | |
| download | linux-545cd5e5ec5477c325e4098b6fd21213dceda408.tar.xz | |
net: Busy polling should ignore sender CPUs
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>
Diffstat (limited to 'include/net/busy_poll.h')
| -rw-r--r-- | include/net/busy_poll.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h index c0452de83086..3fcda9e70c3f 100644 --- a/include/net/busy_poll.h +++ b/include/net/busy_poll.h @@ -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(); |