From: Stanislav Fomichev <sdf.kernel@gmail.com>
To: Jakub Kicinski <kuba@kernel.org>
Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com,
pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org,
jv@jvosburgh.net, hawk@kernel.org, sdf@fomichev.me,
emil@etsalapatis.com, liuhangbin@gmail.com, bpf@vger.kernel.org,
linux-kselftest@vger.kernel.org, willemdebruijn.kernel@gmail.com,
aleksander.lobakin@intel.com
Subject: Re: [PATCH net-next 4/5] selftests/bpf: check XDP attach on a nested bond slave
Date: Tue, 29 Sep 2026 16:32:58 -0700 [thread overview]
Message-ID: <arxKpT2j8-26H7-X@devvm7509.cco0.facebook.com> (raw)
In-Reply-To: <20260928223648.2739371-5-kuba@kernel.org>
On 09/28, Jakub Kicinski wrote:
> test_xdp_bonding_attach() already covers a flat bond both ways round:
> the master is refused while a slave has a program, and a slave is
> refused while the master has one. The nested test only ever checked
> that attaching to the outermost master succeeds.
>
> That left the more interesting half of the nesting untested. Only the
> direct upper is consulted when deciding whether a device is already
> running XDP, so with bond -> bond_nest1 -> bond_nest2 the check on
> bond_nest2 looks at bond_nest1, and it only sees a program there if
> bond_nest1 recorded the one it was handed. Before the preceding fix it
> did not, and a second program could be attached to bond_nest2 while the
> outer bond's program was already running on it.
>
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
next prev parent reply other threads:[~2026-09-29 23:34 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-28 22:36 [PATCH net-next 0/5] net: fix a couple of problems with XDP and bonding Jakub Kicinski
2026-09-28 22:36 ` [PATCH net-next 1/5] net: record XDP programs propagated to lower devices Jakub Kicinski
2026-09-29 23:32 ` Stanislav Fomichev
2026-09-30 4:38 ` netdev-bot+sashiko
2026-09-28 22:36 ` [PATCH net-next 2/5] netdevsim: add ndo_xdp_xmit Jakub Kicinski
2026-09-29 23:32 ` Stanislav Fomichev
2026-09-30 4:38 ` netdev-bot+sashiko
2026-09-28 22:36 ` [PATCH net-next 3/5] selftests: drv-net: check tcp-data-split against an already attached XDP Jakub Kicinski
2026-09-29 23:32 ` Stanislav Fomichev
2026-09-30 4:38 ` netdev-bot+sashiko
2026-09-28 22:36 ` [PATCH net-next 4/5] selftests/bpf: check XDP attach on a nested bond slave Jakub Kicinski
2026-09-29 23:32 ` Stanislav Fomichev [this message]
2026-09-30 4:38 ` netdev-bot+sashiko
2026-09-28 22:36 ` [PATCH net-next 5/5] net: drop GSO skbs instead of handing them to XDP Jakub Kicinski
2026-09-29 23:33 ` Stanislav Fomichev
2026-09-30 4:38 ` netdev-bot+sashiko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=arxKpT2j8-26H7-X@devvm7509.cco0.facebook.com \
--to=sdf.kernel@gmail.com \
--cc=aleksander.lobakin@intel.com \
--cc=andrew+netdev@lunn.ch \
--cc=bpf@vger.kernel.org \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=emil@etsalapatis.com \
--cc=hawk@kernel.org \
--cc=horms@kernel.org \
--cc=jv@jvosburgh.net \
--cc=kuba@kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=liuhangbin@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=sdf@fomichev.me \
--cc=willemdebruijn.kernel@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox