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SubjectRe: [Internet]Re: [PATCH net-next v4 4/4] net: tun: track dropped skb via kfree_skb_reason()
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On 2022/3/2 AM 11:29,“David Ahern”<dsahern@gmail.com> write:

>On 3/1/22 7:50 PM, Jakub Kicinski wrote:
>> On Sat, 26 Feb 2022 00:49:29 -0800 Dongli Zhang wrote:
>>> + SKB_DROP_REASON_SKB_PULL, /* failed to pull sk_buff data */
>>> + SKB_DROP_REASON_SKB_TRIM, /* failed to trim sk_buff data */
>>
[...]
>>> SKB_DROP_REASON_DEV_HDR, /* there is something wrong with
>>> * device driver specific header
>>> */
>>> + SKB_DROP_REASON_DEV_READY, /* device is not ready */
>>
>> What is ready? link is not up? peer not connected? can we expand?
>
>As I recall in this case it is the tfile for a tun device disappeared -
>ie., a race condition.

This seems is that tun is not attached to a file (the tun device file
is not opened?) Maybe TAP_UNATTACHED is more suitable :)


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