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Tue, 23 Sep 2025 13:00:48 -0700 (PDT) From: Mehdi Ben Hadj Khelifa To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, donald.hunter@gmail.com, andrew+netdev@lunn.ch, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, matttbe@kernel.org, chuck.lever@oracle.com, jdamato@fastly.com, skhawaja@google.com, dw@davidwei.uk, mkarsten@uwaterloo.ca, yoong.siang.song@intel.com, david.hunter.linux@gmail.com, skhan@linuxfoundation.org Cc: horms@kernel.org, sdf@fomichev.me, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, Mehdi Ben Hadj Khelifa Subject: [PATCH RFC 2/4] net: xdp: Add xmo_rx_queue_index callback Date: Tue, 23 Sep 2025 22:00:13 +0100 Message-ID: <20250923210026.3870-3-mehdi.benhadjkhelifa@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250923210026.3870-1-mehdi.benhadjkhelifa@gmail.com> References: <20250923210026.3870-1-mehdi.benhadjkhelifa@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce xmo_rx_queue_index netdev callback in order allow the eBPF program bounded to the device to retrieve the RX queue index from the hw NIC. Signed-off-by: Mehdi Ben Hadj Khelifa --- include/net/xdp.h | 5 +++++ net/core/xdp.c | 15 +++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/net/xdp.h b/include/net/xdp.h index b40f1f96cb11..edbf66c31f83 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -547,6 +547,10 @@ void xdp_attachment_setup(struct xdp_attachment_info *= info, NETDEV_XDP_RX_METADATA_VLAN_TAG, \ bpf_xdp_metadata_rx_vlan_tag, \ xmo_rx_vlan_tag) \ + XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_QUEUE_INDEX, \ + NETDEV_XDP_RX_METADATA_QUEUE_INDEX, \ + bpf_xdp_metadata_rx_queue_index, \ + xmo_rx_queue_index) \ =20 enum xdp_rx_metadata { #define XDP_METADATA_KFUNC(name, _, __, ___) name, @@ -610,6 +614,7 @@ struct xdp_metadata_ops { enum xdp_rss_hash_type *rss_type); int (*xmo_rx_vlan_tag)(const struct xdp_md *ctx, __be16 *vlan_proto, u16 *vlan_tci); + int (*xmo_rx_queue_index)(const struct xdp_md *ctx, u32 *queue_index); }; =20 #ifdef CONFIG_NET diff --git a/net/core/xdp.c b/net/core/xdp.c index 491334b9b8be..78c0c63e343c 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -962,6 +962,21 @@ __bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const str= uct xdp_md *ctx, return -EOPNOTSUPP; } =20 +/** + * bpf_xdp_metadata_rx_queue_index - Read XDP frame RX queue index. + * @ctx: XDP context pointer. + * @queue_index: Return value pointer. + * + * Return: + * * Returns 0 on success or ``-errno`` on error. + * * ``-EOPNOTSUPP`` : means device driver does not implement kfunc + * * ``-ENODATA`` : means no RX queue index available for this frame + */ +__bpf_kfunc int bpf_xdp_metadata_rx_queue_index(const struct xdp_md *ctx, = u32 *queue_index) +{ + return -EOPNOTSUPP; +} + __bpf_kfunc_end_defs(); =20 BTF_KFUNCS_START(xdp_metadata_kfunc_ids) --=20 2.51.0