netdev - Re: [PATCH net-next 3/3] udp: keep the sk_receive

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Message-ID: <1494864688.6465.2.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Mon, 15 May 2017 09:11:28 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 3/3] udp: keep the sk_receive_queue held when
 splicing

On Mon, 2017-05-15 at 11:01 +0200, Paolo Abeni wrote:
> On packet reception, when we are forced to splice the
> sk_receive_queue, we can keep the related lock held, so
> that we can avoid re-acquiring it, if fwd memory
> scheduling is required.
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
>  net/ipv4/udp.c | 36 ++++++++++++++++++++++++++----------
>  1 file changed, 26 insertions(+), 10 deletions(-)
> 
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index 492c76b..d698973 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -1164,7 +1164,8 @@ int udp_sendpage(struct sock *sk, struct page *page, int offset,
>  }
>  
>  /* fully reclaim rmem/fwd memory allocated for skb */
> -static void udp_rmem_release(struct sock *sk, int size, int partial)
> +static void udp_rmem_release(struct sock *sk, int size, int partial,
> +			     int rx_queue_lock_held)

Looks good, but please use a bool rx_queue_lock_held ?

Thanks !