linux-kernel - [PATCH net-next 0/3] make skip

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Date: Thu, 15 Feb 2024 16:04:41 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Jiri Pirko <jiri@...nulli.us>
Cc: Asbjørn Sloth Tønnesen <ast@...erby.net>,
	Daniel Borkmann <daniel@...earbox.net>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llu@...erby.dk
Subject: [PATCH net-next 0/3] make skip_sw actually skip software

Hi,

During development of flower-route[1], which I
recently presented at FOSDEM[2], I noticed that
CPU usage, would increase the more rules I installed
into the hardware for IP forwarding offloading.

Since we use TC flower offload for the hottest
prefixes, and leave the long tail to Linux / the CPU.
we therefore need both the hardware and software
datapath to perform well.

I found that skip_sw rules, are quite expensive
in the kernel datapath, sice they must be evaluated
and matched upon, before the kernel checks the
skip_sw flag.

This patchset optimizes the case where all rules
are skip_sw.

[1] flower-route
    https://github.com/fiberby-dk/flower-route

[2] FOSDEM talk
    https://fosdem.org/2024/schedule/event/fosdem-2024-3337-flying-higher-hardware-offloading-with-bird/

Asbjørn Sloth Tønnesen (3):
  net: sched: cls_api: add skip_sw counter
  net: sched: cls_api: add filter counter
  net: sched: make skip_sw actually skip software

 include/net/pkt_cls.h     |  5 +++++
 include/net/sch_generic.h |  3 +++
 net/core/dev.c            |  3 +++
 net/sched/cls_api.c       | 24 ++++++++++++++++++++++++
 4 files changed, 35 insertions(+)

-- 
Best regards
Asbjørn Sloth Tønnesen
Network Engineer
Fiberby ApS