netdev - Re: Latest net-next kernel 4.19.0+

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Date:   Tue, 30 Oct 2018 00:29:13 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Dimitris Michailidis <dmichail@...gle.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Paweł Staszewski <pstaszewski@...are.pl>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Latest net-next kernel 4.19.0+

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.