netdev - Re: [PATCH net v2] net: thunderx: Fix TCP/UDP checksum offload for IPv6 pkts

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Date:   Thu, 23 Nov 2017 10:10:16 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Aleksey Makarov <aleksey.makarov@...iga.com>,
        netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        "Goutham, Sunil" <Sunil.Goutham@...ium.com>,
        Robert Richter <rric@...nel.org>,
        Florian Westphal <fw@...len.de>,
        Aleksey Makarov <aleksey.makarov@...ium.com>,
        Sunil Goutham <sgoutham@...ium.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net v2] net: thunderx: Fix TCP/UDP checksum offload for
 IPv6 pkts

On Thu, 2017-11-23 at 17:41 +0300, Aleksey Makarov wrote:
> From: Sunil Goutham <sgoutham@...ium.com>
> 
> Don't offload IP header checksum to NIC.
> 
> This fixes a previous patch which enabled checksum offloading
> for both IPv4 and IPv6 packets.  So L3 checksum offload was
> getting enabled for IPv6 pkts.  And HW is dropping these pkts
> as it assumes the pkt is IPv4 when IP csum offload is set
> in the SQ descriptor.
> 
> Fixes: bbbb494fd005 ("net: thunderx: Enable TSO and checksum offloads
> for ipv6")
> Signed-off-by: Sunil Goutham <sgoutham@...ium.com>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@...iga.com>
> ---
>  drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> v2:
> - Don't enable checksum offloading both for IPv4 and IPv6 (Eric
> Dumazet)
> 
> v1:
>   https://lkml.kernel.org/r/20171122123727.23580-1-aleksey.makarov@au
> riga.com
> 
> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> index d4496e9afcdf..8b2c31e2a2b0 100644
> --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> @@ -1355,7 +1355,6 @@ nicvf_sq_add_hdr_subdesc(struct nicvf *nic,
> struct snd_queue *sq, int qentry,
>  
>  	/* Offload checksum calculation to HW */
>  	if (skb->ip_summed == CHECKSUM_PARTIAL) {
> -		hdr->csum_l3 = 1; /* Enable IP csum calculation */
>  		hdr->l3_offset = skb_network_offset(skb);
>  		hdr->l4_offset = skb_transport_offset(skb);
>  

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks !