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SubjectRe: [PATCH net-next v3 3/3] net: icmp: add reasons of the skb drops to icmp protocol
On Thu, Mar 17, 2022 at 10:48 PM David Ahern <dsahern@kernel.org> wrote:
>
> On 3/16/22 10:05 PM, Jakub Kicinski wrote:
> > On Wed, 16 Mar 2022 21:35:47 -0600 David Ahern wrote:
> >> On 3/16/22 9:18 PM, Jakub Kicinski wrote:
> >>>
> >>> I guess this set raises the follow up question to Dave if adding
> >>> drop reasons to places with MIB exception stats means improving
> >>> the granularity or one MIB stat == one reason?
> >>
> >> There are a few examples where multiple MIB stats are bumped on a drop,
> >> but the reason code should always be set based on first failure. Did you
> >> mean something else with your question?
> >
> > I meant whether we want to differentiate between TYPE, and BROADCAST or
> > whatever other possible invalid protocol cases we can get here or just
> > dump them all into a single protocol error code.
>
> I think a single one is a good starting point.

Ok, I'll try my best to make a V4 base this way...Is there any inspiration?

Such as we make SKB_DROP_REASON_PTYPE_ABSENT to
SKB_DROP_REASON_L2_PROTO, which means the L2 protocol is not
supported or invalied.

And use SKB_DROP_REASON_L4_PROTO for the L4 protocol problem,
such as GRE version not supported, ICMP type not supported, etc.

Sounds nice, isn't it?

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