Subject: [net-next PATCH V3 1/3] net: adjust napi_consume_skb to handle none-NAPI callers

From: Jesper Dangaard Brouer <[email-masked]>
Date: Thu, 10 Mar 2016 15:59:11 +0100

Some drivers reuse/share code paths that free SKBs between NAPI
and none-NAPI calls. Adjust napi_consume_skb to handle this
use-case.

Before, calls from netpoll (w/ IRQs disabled) was handled and
indicated with a budget zero indication.  Use the same zero
indication to handle calls not originating from NAPI/softirq.
Simply handled by using dev_consume_skb_any().

This adds an extra branch+call for the netpoll case (checking
in_irq() + irqs_disabled()), but that is okay as this is a slowpath.

Suggested-by: Alexander Duyck <[email-masked]>
Signed-off-by: Jesper Dangaard Brouer <[email-masked]>
---
 net/core/skbuff.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 7af7ec635d90..bc62baa54ceb 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -801,9 +801,9 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
 	if (unlikely(!skb))
 		return;
 
-	/* if budget is 0 assume netpoll w/ IRQs disabled */
+	/* Zero budget indicate none-NAPI context called us, like netpoll */
 	if (unlikely(!budget)) {
-		dev_consume_skb_irq(skb);
+		dev_consume_skb_any(skb);
 		return;
 	}