netdev - Re: [PATCH V2 net-next 2/2] net/mlx4_en: Extend checksum offloading by CHECKSUM COMPLETE

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Message-ID: <CAJ3xEMg4Nhd1B4iO20=Xt=Z9jeYJVbVnXdgz5Q1w0KQ+9kVYRQ@mail.gmail.com>
Date:	Sun, 9 Nov 2014 10:24:41 +0200
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Amir Vadai <amirv@...lanox.com>, Ido Shamay <idos@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Matan Barak <matanb@...lanox.com>,
	Saeed Mahameed <saeedm@...lanox.com>,
	Shani Michaeli <shanim@...lanox.com>,
	Jerry Chu <hkchu@...gle.com>
Subject: Re: [PATCH V2 net-next 2/2] net/mlx4_en: Extend checksum offloading
 by CHECKSUM COMPLETE

On Fri, Nov 7, 2014 at 10:40 AM, Ido Shamay <idos@....mellanox.co.il> wrote:
> On 11/6/2014 6:28 PM, Or Gerlitz wrote:
>>
>>                 if (likely(dev->features & NETIF_F_RXCSUM)) {
>> -                       if ((cqe->status &
>> cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
>> -                           (cqe->checksum == cpu_to_be16(0xffff))) {
>> -                               ring->csum_ok++;
>> -                               ip_summed = CHECKSUM_UNNECESSARY;
>> +                       if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP
>> |
>> +
>> MLX4_CQE_STATUS_UDP)) {
>> +                               if ((cqe->status &
>> cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
>> +                                   cqe->checksum == cpu_to_be16(0xffff))
>> {
>> +                                       ip_summed = CHECKSUM_UNNECESSARY;
>> +                                       ring->csum_ok++;
>> +                               } else {
>> +                                       ip_summed = CHECKSUM_NONE;
>> +                                       ring->csum_none++;
>> +                               }
>>                         } else {
>> -                               ip_summed = CHECKSUM_NONE;
>> -                               ring->csum_none++;
>> +                               if (priv->flags &
>> MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP &&
>> +                                   (cqe->status &
>> cpu_to_be16(MLX4_CQE_STATUS_IPV4 |
>> +
>> MLX4_CQE_STATUS_IPV6))) {
>> +                                       ip_summed = CHECKSUM_COMPLETE;
>> +                                       ring->csum_complete++;
>> +                               } else {
>> +                                       ip_summed = CHECKSUM_NONE;
>> +                                       ring->csum_none++;
>> +                               }
>>                         }
>>                 } else {
>>                         ip_summed = CHECKSUM_NONE;
>> @@ -776,6 +874,14 @@ int mlx4_en_process_rx_cq(struct net_device *dev,
>> struct mlx4_en_cq *cq, int bud
>>                         if (!nr)
>>                                 goto next;
>>
>> +                       if (ip_summed == CHECKSUM_COMPLETE) {
>> +                               va =
>> skb_frag_address(skb_shinfo(gro_skb)->frags);
>> +                               if (check_csum(cqe, gro_skb, va,
>> ring->hwtstamp_rx_filter)) {
>> +                                       ip_summed = CHECKSUM_NONE;
>> +                                       ring->csum_none++;
>
>
> When check_csum returns non zero value, then ring->csum_complete counter was
> already incremented, and now we are incrementing ring->csum_none (for the
> same packet), so need to --ring->csum_complete.

Thanks Ido, I'll fix that.

Amir, I saw the little noise you just reported on too but didn't want
to re-spin V1 just for that, thanks for catching this up.


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