udev: Enable ntuple offloading feature in supported NICs

  We are using CPU-affinity and packet steering functions in various
places in IPFire, but packets might still be received on a random CPU
core.

This feature enables that packets that belong to the same connection
(i.e. have the save tuple) will be steered to the same queue. This will
increase cache locality and decrease locking which results in higher
throughput.

https://www.kernel.org/doc/Documentation/networking/scaling.txt

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---
 config/rootfiles/common/udev    |  2 ++
 config/udev/99-offloading.rules |  2 ++
 config/udev/network-offloading  | 44 +++++++++++++++++++++++++++++++++
 lfs/udev                        |  6 +++++
 4 files changed, 54 insertions(+)
 create mode 100644 config/udev/99-offloading.rules
 create mode 100644 config/udev/network-offloading
  

Acked-by: Peter Müller <peter.mueller@ipfire.org>

> We are using CPU-affinity and packet steering functions in various
> places in IPFire, but packets might still be received on a random CPU
> core.
> 
> This feature enables that packets that belong to the same connection
> (i.e. have the save tuple) will be steered to the same queue. This will
> increase cache locality and decrease locking which results in higher
> throughput.
> 
> https://www.kernel.org/doc/Documentation/networking/scaling.txt
> 
> Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
> ---
>  config/rootfiles/common/udev    |  2 ++
>  config/udev/99-offloading.rules |  2 ++
>  config/udev/network-offloading  | 44 +++++++++++++++++++++++++++++++++
>  lfs/udev                        |  6 +++++
>  4 files changed, 54 insertions(+)
>  create mode 100644 config/udev/99-offloading.rules
>  create mode 100644 config/udev/network-offloading
> 
> diff --git a/config/rootfiles/common/udev b/config/rootfiles/common/udev
> index 877a832a3..4a01f3eef 100644
> --- a/config/rootfiles/common/udev
> +++ b/config/rootfiles/common/udev
> @@ -37,6 +37,7 @@ lib/udev/mtd_probe
>  lib/udev/network-hotplug-bridges
>  lib/udev/network-hotplug-rename
>  lib/udev/network-hotplug-vlan
> +lib/udev/network-offloading
>  lib/udev/rule_generator.functions
>  #lib/udev/rules.d
>  lib/udev/rules.d/25-alsa.rules
> @@ -64,6 +65,7 @@ lib/udev/rules.d/78-sound-card.rules
>  lib/udev/rules.d/80-drivers.rules
>  lib/udev/rules.d/90-hwrng.rules
>  lib/udev/rules.d/99-codel.rules
> +lib/udev/rules.d/99-offloading.rules
>  lib/udev/scsi_id
>  lib/udev/v4l_id
>  lib/udev/write_cd_rules
> diff --git a/config/udev/99-offloading.rules b/config/udev/99-offloading.rules
> new file mode 100644
> index 000000000..5387971ac
> --- /dev/null
> +++ b/config/udev/99-offloading.rules
> @@ -0,0 +1,2 @@
> +# Call the offloading script
> +SUBSYSTEM=="net", RUN+="/lib/udev/network-offloading"
> diff --git a/config/udev/network-offloading b/config/udev/network-offloading
> new file mode 100644
> index 000000000..dfdf51ee9
> --- /dev/null
> +++ b/config/udev/network-offloading
> @@ -0,0 +1,44 @@
> +#!/bin/bash
> +############################################################################
> +#                                                                          #
> +# This file is part of the IPFire Firewall.                                #
> +#                                                                          #
> +# IPFire is free software; you can redistribute it and/or modify           #
> +# it under the terms of the GNU General Public License as published by     #
> +# the Free Software Foundation; either version 2 of the License, or        #
> +# (at your option) any later version.                                      #
> +#                                                                          #
> +# IPFire is distributed in the hope that it will be useful,                #
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of           #
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            #
> +# GNU General Public License for more details.                             #
> +#                                                                          #
> +# You should have received a copy of the GNU General Public License        #
> +# along with IPFire; if not, write to the Free Software                    #
> +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA #
> +#                                                                          #
> +# Copyright (C) 2021 IPFire Team <info@ipfire.org>.                        #
> +#                                                                          #
> +############################################################################
> +
> +if [ -z "${INTERFACE}" ]; then
> +	echo "INTERFACE variable was not set" >&2
> +	exit 1
> +fi
> +
> +case "${ACTION}" in
> +	add|register)
> +		# Try to enable ntuple (and ignore if not supported)
> +		ethtool --features "${INTERFACE}" ntuple on &>/dev/null
> +		;;
> +
> +	remove|unregister)
> +		# Nothing to do here.
> +		;;
> +
> +	*)
> +		echo "No or unkown ACTION set" >&2
> +		exit 1
> +esac
> +
> +exit 0
> diff --git a/lfs/udev b/lfs/udev
> index b578ab54c..cfad0398b 100644
> --- a/lfs/udev
> +++ b/lfs/udev
> @@ -132,5 +132,11 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
>  	install -m 755 $(DIR_SRC)/config/udev/enable_codel \
>  		/lib/udev/enable_codel
>  
> +	# Install offloading rules
> +	install -v -m 644 $(DIR_SRC)/config/udev/99-offloading.rules \
> +		/lib/udev/rules.d
> +	install -m 755 $(DIR_SRC)/config/udev/network-offloading \
> +		/lib/udev/network-offloading
> +
>  	@rm -rf $(DIR_APP)
>  	@$(POSTBUILD)
>