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Tue, 06 Oct 2026 10:33:16 -0700 (PDT) From: Tianyi Gao To: netdev@vger.kernel.org Cc: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, toke@redhat.com, lorenzo@kernel.org, horms@kernel.org, bpf@vger.kernel.org, shuah@kernel.org, hawk@kernel.org, kernel-team@cloudflare.com, ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, sdf@fomichev.me, linux-kselftest@vger.kernel.org, Tianyi Gao Subject: [PATCH net 0/2] veth: fix peer NETDEV_XDP_ACT_NDO_XMIT after GRO is toggled while down Date: Tue, 6 Oct 2026 18:32:35 +0100 Message-ID: <20261006173241.65945-1-tianyi@cloudflare.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Toggling GRO on a veth device while it is down leaves its peer's NETDEV_XDP_ACT_NDO_XMIT flag stale once the device comes up. XDP redirects into the peer are then rejected with -EOPNOTSUPP, or, if GRO was turned off, accepted and then dropped with -ENXIO. Patch 1 refreshes the peer's flags in veth_open(). Patch 2 extends veth.sh to check the peer's flag after GRO is toggled while the device is down, in both directions. Tianyi Gao (2): veth: fix peer NETDEV_XDP_ACT_NDO_XMIT after GRO is toggled while down selftests: net: veth: test peer ndo-xmit after GRO toggle while down drivers/net/veth.c | 1 + tools/testing/selftests/net/veth.sh | 46 +++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) base-commit: d5a007b9b457c915ab1a53227e8939e4018aa97a -- 2.55.0