netdev - [PATCH 0/2] macvlan: Allow some packets to bypass broadcast queue

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Message-ID: <ZCJXefIhSrd7Hm2Z@gondor.apana.org.au>
Date:   Tue, 28 Mar 2023 10:56:57 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     netdev@...r.kernel.org
Subject: [PATCH 0/2] macvlan: Allow some packets to bypass broadcast queue

This patch series allows some packets to bypass the broadcast
queue on receive.  Currently all multicast packets are queued
on receive and then processed in a work queue.  This is to avoid
an unbounded amount of work occurring in the receive path, as
one broadcast packet could easily translate into 4,000 packets.

However, for multicast packets with just one receiver (possible
for IPv6 ND), this introduces unnecessary latency as the packet
will go to exactly one device.

This series allows such multicast packets to be processed inline.
It also adds a toggle which lets the admin control what threshold
to set between queueing and not queueing.  A follow-up patch for
iproute will be posted.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt