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Subject: Re: Anyone using Solarflare on FreeBSD 10-STABLE ?
To: Philip Paeps <philip@freebsd.org>, Allan Jude <allanjude@freebsd.org>,
 Mark Saad <nonesuch@longcount.org>
Cc: freebsd-hackers@freebsd.org
References: <CAMXt9Na1MkFJHXCxQhkVU=JoqvVsU_w1U3xNTN+J0PzxESChaw@mail.gmail.com>
 <bf3d1ef1-30d9-f7c7-5a2a-af47cc937414@freebsd.org>
 <333473BB-43C3-4E3E-B62F-03DE5650E403@freebsd.org>
From: Andrew Rybchenko <arybchik@freebsd.org>
Message-ID: <7951e7d5-b5e6-033d-0b51-1d4a10946937@oktetlabs.ru>
Date: Tue, 17 Oct 2017 22:44:55 +0300
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On 10/17/2017 08:54 PM, Philip Paeps wrote:
> On 2017-10-17 19:36:20 (+0200), Allan Jude wrote:
>> On 10/17/2017 12:32, Mark Saad wrote:
>>> Speificly I wanted to know if anyone knew what this sysctl refers to
>>>
>>> dev.sfxge.NN.stats.rxdp_di_dropped_pkts
>>
>> I have two 11.1 boxes with a dual ported sfxge each, but I have no idea
>> what that counter is trying to describe.
>>
>> The man page says this is Philip's fault.
>
> This code is not my fault! ;-)  I believe arybchik added it.
>
> Looking at the code, it's packets that have been dropped in the data 
> path by the dispatcher cpu.  Probably related to virtual functions?

Philip, thanks. I don't think in this particular case it is related to 
virtual functions.

Basically the counter means that ingress packet does not match any 
installed filter. E.g. promiscuous mode is disabled and:
  - destination MAC is unicast and not the interface MAC address, OR
  - destination MAC is multicast and there is no matching multicast 
address added.

There is a race condition as well on interface bring up when packet is 
received but default filters are not installed yet.

SFN8522 and SFN8542 have other cases for encapsulated traffic depending 
on driver version (right now I don't remember the state in 10-STABLE).

Mark, let me know if I can help more.

Andrew.