Subject: Re: [PATCH net-next] net: Add low-latency/polling support for UDP multicast

From: Eliezer Tamir <[email-masked]>
Date: Tue, 06 Aug 2013 10:13:07 +0300

On 06/08/2013 01:16, Shawn Bohrer wrote:
> Set the napi id for each socket in the multicast path to enable
> low-latency/polling support.
> 
> Signed-off-by: Shawn Bohrer <[email-masked]>
> ---
>  net/ipv4/udp.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index 766e6ba..0d0da17 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -1596,6 +1596,7 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
>  	dif = skb->dev->ifindex;
>  	sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
>  	while (sk) {
> +		sk_mark_napi_id(sk, skb);
>  		stack[count++] = sk;
>  		sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest,
>  				       daddr, uh->source, saddr, dif);
> 

Looks OK.
To be complete, you want to do the same for __udp6_lib_mcast_deliver().

-Eliezer