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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan , Alex Shi , Yanteng Si , Dongliang Mu , Michael Chan , Pavan Chebbi , Joshua Washington , Harshitha Ramamurthy , Saeed Mahameed , Tariq Toukan , Mark Bloch , Leon Romanovsky , Alexander Duyck , kernel-team@meta.com, Daniel Borkmann , Nikolay Aleksandrov , Shuah Khan , dw@davidwei.uk, mohsin.bashr@gmail.com, willemb@google.com, jiang.kun2@zte.com.cn, xu.xin16@zte.com.cn, wang.yaxin@zte.com.cn, netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Stanislav Fomichev , Mina Almasry , Bobby Eshleman Subject: Re: [PATCH net-next v3 7/8] selftests: drv-net: add primary_rx_redirect support to NetDrvContEnv Message-ID: References: <20260507-tcp-dm-netkit-v3-0-52821445867c@meta.com> <20260507-tcp-dm-netkit-v3-7-52821445867c@meta.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260507-tcp-dm-netkit-v3-7-52821445867c@meta.com> On 05/07, Bobby Eshleman wrote: > From: Bobby Eshleman > > When sending from a namespace that has access to a netkit device with a > leased queue, the nk primary in the host namespace needs to redirect its > RX to the physical device. This patch adds that redirection bpf program > and teaches the harness to install it. > > Add primary_rx_redirect=False parameter to NetDrvContEnv.__init__(). > When enabled, _attach_primary_rx_redirect_bpf() attaches a new BPF TC > program (nk_primary_rx_redirect.bpf.c) to the primary (host-side) netkit > interface. The program redirects non-ICMPv6 IPv6 packets to the physical > NIC via bpf_redirect_neigh(), with the physical ifindex configured via > the .bss map. ICMPv6 is left on the host's netkit primary so IPv6 > neighbor discovery still work locally. > > Extract _find_bss_map_id() from _attach_bpf() into a reusable helper so > other BPF attachment methods can use it. > > Signed-off-by: Bobby Eshleman Acked-by: Stanislav Fomichev