Introduce xmo_rx_checksum netdev callback in order allow the eBPF program bounded to the device to retrieve the RX checksum result computed by the hw NIC.
Signed-off-by: Lorenzo Bianconi <[email protected]> --- include/net/xdp.h | 6 ++++++ net/core/xdp.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/net/xdp.h b/include/net/xdp.h index 6fd294fa6841d59c3d7dc4475e09e731996566b0..481b39976ac8c8d4db2de39055c72ba8d0d511c3 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -581,6 +581,10 @@ 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_CHECKSUM, \ + NETDEV_XDP_RX_METADATA_CHECKSUM, \ + bpf_xdp_metadata_rx_checksum, \ + xmo_rx_checksum) enum xdp_rx_metadata { #define XDP_METADATA_KFUNC(name, _, __, ___) name, @@ -644,6 +648,8 @@ 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_checksum)(const struct xdp_md *ctx, u8 *ip_summed, + u32 *cksum_meta); }; #ifdef CONFIG_NET diff --git a/net/core/xdp.c b/net/core/xdp.c index 9100e160113a9a1e2cb88e7602e85c5f36a9f3b9..3edab2d5e5c7c2013b1ef98c949a83655eb94349 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -961,6 +961,35 @@ __bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx, return -EOPNOTSUPP; } +/** + * bpf_xdp_metadata_rx_checksum - Read XDP frame RX checksum. + * @ctx: XDP context pointer. + * @ip_summed: Return value pointer indicating checksum result. + * @cksum_meta: Return value pointer indicating checksum result metadata. + * + * In case of success, ``ip_summed`` is set to the RX checksum result. Possible + * values are: + * ``CHECKSUM_NONE`` + * ``CHECKSUM_UNNECESSARY`` + * ``CHECKSUM_COMPLETE`` + * ``CHECKSUM_PARTIAL`` + * + * In case of success, ``cksum_meta`` contains the hw computed checksum value + * for ``CHECKSUM_COMPLETE`` or the ``csum_level`` for + * ``CHECKSUM_UNNECESSARY``. It is set to 0 for ``CHECKSUM_NONE`` and + * ``CHECKSUM_PARTIAL``. + * + * Return: + * * Returns 0 on success or ``-errno`` on error. + * * ``-EOPNOTSUPP`` : means device driver does not implement kfunc + * * ``-ENODATA`` : means no RX-timestamp available for this frame + */ +__bpf_kfunc int bpf_xdp_metadata_rx_checksum(const struct xdp_md *ctx, + u8 *ip_summed, u32 *cksum_meta) +{ + return -EOPNOTSUPP; +} + __bpf_kfunc_end_defs(); BTF_KFUNCS_START(xdp_metadata_kfunc_ids) -- 2.51.0
