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    SubjectRe: [PATCH net-next v3 3/3] net: icmp: add reasons of the skb drops to icmp protocol
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    On 3/17/22 7:37 PM, Menglong Dong wrote:
    > 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.

    not following. PTYPE is a Linux name. That means nothing to a user.

    I am not sure where you want to use L2_PROTO.

    >
    > 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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