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authorAlexander Duyck <alexander.h.duyck@intel.com>2017-03-24 20:07:53 +0300
committerDavid S. Miller <davem@davemloft.net>2017-03-25 06:49:30 +0300
commit545cd5e5ec5477c325e4098b6fd21213dceda408 (patch)
tree43a2aaa0f59d8721b8ab25d0f52749f798f42122 /include/net/busy_poll.h
parentdcb421f4279f362c3eef7479616c76588b74d782 (diff)
downloadlinux-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.h9
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();