netdev - Re: Latest net-next kernel 4.19.0+

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Date:   Tue, 30 Oct 2018 07:16:18 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paweł Staszewski <pstaszewski@...are.pl>,
        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+



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));