netdev - Re: [PATCH bpf-next v4 3/4] net: stmmac: Add launch time support to XDP ZC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <Z4AJx-a-eY3pgHNv@mini-arch>
Date: Thu, 9 Jan 2025 09:39:19 -0800
From: Stanislav Fomichev <stfomichev@...il.com>
To: "Song, Yoong Siang" <yoong.siang.song@...el.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Willem de Bruijn <willemb@...gle.com>,
	"Bezdeka, Florian" <florian.bezdeka@...mens.com>,
	Donald Hunter <donald.hunter@...il.com>,
	Jonathan Corbet <corbet@....net>, Bjorn Topel <bjorn@...nel.org>,
	"Karlsson, Magnus" <magnus.karlsson@...el.com>,
	"Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
	Jonathan Lemon <jonathan.lemon@...il.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	"Damato, Joe" <jdamato@...tly.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Mina Almasry <almasrymina@...gle.com>,
	Daniel Jurgens <danielj@...dia.com>,
	Amritha Nambiar <amritha.nambiar@...el.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Mykola Lysenko <mykolal@...com>,
	Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	"Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
	"Kitszel, Przemyslaw" <przemyslaw.kitszel@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"bpf@...r.kernel.org" <bpf@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
	"linux-stm32@...md-mailman.stormreply.com" <linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"xdp-hints@...-project.net" <xdp-hints@...-project.net>
Subject: Re: [PATCH bpf-next v4 3/4] net: stmmac: Add launch time support to
 XDP ZC

On 01/09, Song, Yoong Siang wrote:
> On Wednesday, January 8, 2025 1:08 AM, Stanislav Fomichev <stfomichev@...il.com> wrote:
> >On 01/06, Song Yoong Siang wrote:
> >> Enable launch time (Time-Based Scheduling) support to XDP zero copy via XDP
> >> Tx metadata framework.
> >>
> >> This patch is tested with tools/testing/selftests/bpf/xdp_hw_metadata on
> >> Intel Tiger Lake platform. Below are the test steps and result.
> >>
> >> Test Steps:
> >> 1. Add mqprio qdisc:
> >>    $ sudo tc qdisc add dev enp0s30f4 handle 8001: parent root mqprio num_tc
> >>      4 map 0 1 2 3 3 3 3 3 3 3 3 3 3 3 3 3 queues 1@0 1@1 1@2 1@3 hw 0
> >>
> >> 2. Enable launch time hardware offload on hardware queue 1:
> >>    $ sudo tc qdisc replace dev enp0s30f4 parent 8001:2 etf offload clockid
> >>      CLOCK_TAI delta 500000
> >>
> >> 3. Add an ingress qdisc:
> >>    $ sudo tc qdisc add dev enp0s30f4 ingress
> >>
> >> 4. Add a flower filter to route incoming packet with VLAN priority 1 into
> >>    hardware queue 1:
> >>    $ sudo tc filter add dev enp0s30f4 parent ffff: protocol 802.1Q flower
> >>      vlan_prio 1 hw_tc 1
> >>
> >> 5. Enable VLAN tag stripping:
> >>    $ sudo ethtool -K enp0s30f4 rxvlan on
> >>
> >> 6. Start xdp_hw_metadata selftest application:
> >>    $ sudo ./xdp_hw_metadata enp0s30f4 -l 1000000000
> >>
> >> 7. Send an UDP packet with VLAN priority 1 to port 9091 of DUT.
> >
> >Tangential: I wonder whether we can add the setup steps to the
> >xdp_hw_metadata tool? It is useful to have one command to run that
> >takes care of all the details. Same way it already enables HW
> >tstamping..
> >
> >Or, if not the full setup, some kind of detection we can signal to the
> >user that some things might be missing?
> 
> Sure. I can try to add the setup steps into xdp_hw_metadata
> by using ioctl() function. However, there are some device specific
> command, like the number of queue, their priority,
> how they route the incoming packet, etc. I will try to find out
> a common way that can work for most of the devices,
> at least work for both igc and stmmac.

We can query the number of queues (and everything else you need) in the
tool, similar to what we do in
testing/selftests/drivers/net/hw/ncdevmem.c, take a look. But if it's
too complicated, maybe at least print these commands on startup and tell
the user to run them.

The reason I'm asking is that I hope that we eventually can run this
tool from (automatic) testing/selftests/drivers/net/hw testsuite to
make sure the metadata stuff keeps working.