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Message-Id: <cover.1675708062.git.pabeni@redhat.com>
Date: Mon, 6 Feb 2023 19:30:18 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Subject: [PATCH v3 net-next 0/4] net: introduce rps_default_mask
Real-time setups try hard to ensure proper isolation between time
critical applications and e.g. network processing performed by the
network stack in softirq and RPS is used to move the softirq
activity away from the isolated core.
If the network configuration is dynamic, with netns and devices
routinely created at run-time, enforcing the correct RPS setting
on each newly created device allowing to transient bad configuration
became complex.
Additionally, when multi-queue devices are involved, configuring rps
in user-space on each queue easily becomes very expensive, e.g.
some setups use veths with per cpu queues.
These series try to address the above, introducing a new
sysctl knob: rps_default_mask. The new sysctl entry allows
configuring a netns-wide RPS mask, to be enforced since receive
queue creation time without any fourther per device configuration
required.
Additionally, a simple self-test is introduced to check the
rps_default_mask behavior.
v2 -> v3:
- reduce code duplication
- rebased
Paolo Abeni (4):
net-sysctl: factor out cpumask parsing helper
net-sysctl: factor-out rpm mask manipulation helpers
net: introduce default_rps_mask netns attribute
self-tests: introduce self-tests for RPS default mask
Documentation/admin-guide/sysctl/net.rst | 6 ++
include/linux/netdevice.h | 1 +
net/core/dev.h | 2 +
net/core/net-sysfs.c | 79 +++++++++++-------
net/core/sysctl_net_core.c | 80 ++++++++++++++-----
tools/testing/selftests/net/Makefile | 1 +
tools/testing/selftests/net/config | 3 +
.../testing/selftests/net/rps_default_mask.sh | 57 +++++++++++++
8 files changed, 181 insertions(+), 48 deletions(-)
create mode 100755 tools/testing/selftests/net/rps_default_mask.sh
--
2.39.1
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