netdev - Re: Latest net-next kernel 4.19.0+

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Date:   Wed, 31 Oct 2018 22:24:35 +0100
From:   Paweł Staszewski <pstaszewski@...are.pl>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Dimitris Michailidis <dmichail@...gle.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Latest net-next kernel 4.19.0+



W dniu 30.10.2018 o 15:16, Eric Dumazet pisze:
>
> On 10/30/2018 01:09 AM, Paweł Staszewski wrote:
>>
>> W dniu 30.10.2018 o 08:29, Eric Dumazet pisze:
>>> On 10/29/2018 11:09 PM, Dimitris Michailidis wrote:
>>>
>>>> Indeed this is a bug. I would expect it to produce frequent errors
>>>> though as many odd-length
>>>> packets would trigger it. Do you have RXFCS? Regardless, how
>>>> frequently do you see the problem?
>>>>
>>> Old kernels (before 88078d98d1bb) were simply resetting ip_summed to CHECKSUM_NONE
>>>
>>> And before your fix (commit d55bef5059dd057bd), mlx5 bug was canceling the bug you fixed.
>>>
>>> So we now need to also fix mlx5.
>>>
>>> And of course use skb_header_pointer() in mlx5e_get_fcs() as I mentioned earlier,
>>> plus __get_unaligned_cpu32() as you hinted.
>>>
>>>
>>>
>>>
>> No RXFCS
>>
>> And this trace is rly frequently like once per 3/4 seconds
>> like below:
>> [28965.776864] vlan1490: hw csum failure
> Might be vlan related.
>
> Can you first check this :
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> index 94224c22ecc310a87b6715051e335446f29bec03..6f4bfebf0d9a3ae7567062abb3ea6532b3aaf3d6 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> @@ -789,13 +789,8 @@ static inline void mlx5e_handle_csum(struct net_device *netdev,
>                  skb->ip_summed = CHECKSUM_COMPLETE;
>                  skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
>                  if (network_depth > ETH_HLEN)
> -                       /* CQE csum is calculated from the IP header and does
> -                        * not cover VLAN headers (if present). This will add
> -                        * the checksum manually.
> -                        */
> -                       skb->csum = csum_partial(skb->data + ETH_HLEN,
> -                                                network_depth - ETH_HLEN,
> -                                                skb->csum);
> +                       /* Temporary debugging */
> +                       skb->ip_summed = CHECKSUM_NONE;
>                  if (unlikely(netdev->features & NETIF_F_RXFCS))
>                          skb->csum = csum_add(skb->csum,
>                                               (__force __wsum)mlx5e_get_fcs(skb));
>
>

Ok thanks - will try it.