On 09/20, Lorenzo Bianconi wrote: > 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``
What do you think about adding new UAPI enum here? Similar to xdp_rss_hash_type for the hash. The values can match the internal CHECKSUM_XXX ones with (BUILD_BUG_ONs to enforce the relationship). Will be a bit nicer api-wise to have an enum than an opaque u8.
