netdev - Re: [PATCH] net: Require exact match for TCP socket lookups if dif is l3mdev

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Date:   Thu, 13 Oct 2016 15:39:23 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] net: Require exact match for TCP socket lookups if dif is
 l3mdev

On 10/13/16 3:29 PM, Eric Dumazet wrote:
> Since netif_index_is_l3_master() is not cheap, can you reorder the
> test ?
> 
> if (!net->ipv4.sysctl_tcp_l3mdev_accept)
>         return netif_index_is_l3_master(net, dif);

sure. Since this use case is called under rcu_read_lock I can make a netif_index_is_l3_master_rcu which saves a few cycles.