netdev - Re: [PATCH net-next] vrf: add CRC32c offload to device features

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Date:   Thu, 24 May 2018 16:54:51 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     David Ahern <dsa@...ulusnetworks.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] vrf: add CRC32c offload to device features

On Thu, May 24, 2018 at 05:49:35PM +0200, Davide Caratti wrote:
> SCTP sockets originated in a VRF can improve their performance if CRC32c
> computation is delegated to underlying devices: update device features,
> setting NETIF_F_SCTP_CRC. Iterating the following command in the topology
> proposed with [1],
> 
>  # ip vrf exec vrf-h2 netperf -H 192.0.2.1 -t SCTP_STREAM -- -m 10K
> 
> the measured throughput in Mbit/s improved from 2395 ± 1% to 2720 ± 1%.
> 
> [1] https://www.spinics.net/lists/netdev/msg486007.html
> 
> Signed-off-by: Davide Caratti <dcaratti@...hat.com>

Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>

> ---
>  drivers/net/vrf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
> index 90b5f3900c22..f93547f257fb 100644
> --- a/drivers/net/vrf.c
> +++ b/drivers/net/vrf.c
> @@ -1254,7 +1254,7 @@ static void vrf_setup(struct net_device *dev)
>  
>  	/* enable offload features */
>  	dev->features   |= NETIF_F_GSO_SOFTWARE;
> -	dev->features   |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM;
> +	dev->features   |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
>  	dev->features   |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
>  
>  	dev->hw_features = dev->features;
> -- 
> 2.17.0
>