netdev - Re: [net-next.git 1/7] stmmac: review napi gro support

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Date:	Wed, 03 Apr 2013 00:05:15 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:	netdev@...r.kernel.org
Subject: Re: [net-next.git 1/7] stmmac: review napi gro support

On Wed, 2013-04-03 at 07:41 +0200, Giuseppe CAVALLARO wrote:
> This patch is to:
> o use napi_gro_flush() before calling __napi_complete()
> o turn on NETIF_F_GRO by default
> 
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 6b26d31..8b69e3b 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -2046,7 +2046,8 @@ static int stmmac_poll(struct napi_struct *napi, int budget)
>  
>  	work_done = stmmac_rx(priv, budget);
>  	if (work_done < budget) {
> -		napi_complete(napi);
> +		napi_gro_flush(napi, false);
> +		__napi_complete(napi);
>  		stmmac_enable_dma_irq(priv);
>  	}

Why are you doing this ?

This adds a (fatal) race.


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