linux-kernel - Re: [PATCHv2 net-next] dropwatch: Support monitoring of dropped frames

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Date:   Tue, 4 Aug 2020 14:28:28 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     izabela.bakollari@...il.com
Cc:     Neil Horman <nhorman@...driver.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCHv2 net-next] dropwatch: Support monitoring of dropped frames

On Tue, Aug 4, 2020 at 9:14 AM <izabela.bakollari@...il.com> wrote:
>
> From: Izabela Bakollari <izabela.bakollari@...il.com>
>
> Dropwatch is a utility that monitors dropped frames by having userspace
> record them over the dropwatch protocol over a file. This augument
> allows live monitoring of dropped frames using tools like tcpdump.
>
> With this feature, dropwatch allows two additional commands (start and
> stop interface) which allows the assignment of a net_device to the
> dropwatch protocol. When assinged, dropwatch will clone dropped frames,
> and receive them on the assigned interface, allowing tools like tcpdump
> to monitor for them.
>
> With this feature, create a dummy ethernet interface (ip link add dev
> dummy0 type dummy), assign it to the dropwatch kernel subsystem, by using
> these new commands, and then monitor dropped frames in real time by
> running tcpdump -i dummy0.

drop monitor is already able to send dropped packets to user-space,
and wireshark already catches up with this feature:

https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commitdiff;h=a94a860c0644ec3b8a129fd243674a2e376ce1c8

So what you propose here seems pretty much a duplicate?

Thanks.