From 545cd5e5ec5477c325e4098b6fd21213dceda408 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Fri, 24 Mar 2017 10:07:53 -0700 Subject: 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 Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- include/net/busy_poll.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'include/net/busy_poll.h') 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(); -- cgit v1.2.1