netdev - Re: [Patch net-next v2] net: dump more useful information in netdev_rx_csum

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Date:   Tue, 13 Nov 2018 10:00:37 -0800
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>
Subject: Re: [Patch net-next v2] net: dump more useful information in netdev_rx_csum_fault()

On Mon, Nov 12, 2018 at 2:49 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> Currently netdev_rx_csum_fault() only shows a device name,
> we need more information about the skb for debugging csum
> failures.
>
> Sample output:
>
>  ens3: hw csum failure
>  dev features: 0x0000000000014b89
>  skb len=84 data_len=0 pkt_type=0 gso_size=0 gso_type=0 nr_frags=0 ip_summed=0 csum=0 csum_complete_sw=0 csum_valid=0 csum_level=0

Recent issues were protocol dependent, including whether vlan headers
were present. Perhaps also print skb vlan fields and even the first N
bytes of data to inspect protocol headers? Also skb_iif, esp. if this
differs from dev->ifindex.