Introduce XDP RX checksum capability to XDP metadata specs. XDP RX checksum will be use by devices capable of exposing receive checksum result via bpf_xdp_metadata_rx_checksum(). Moreover, 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 lorenzo@kernel.org --- Documentation/netlink/specs/netdev.yaml | 5 +++++ include/net/xdp.h | 14 ++++++++++++++ net/core/xdp.c | 29 +++++++++++++++++++++++++++++ 3 files changed, 48 insertions(+)
diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml index e00d3fa1c152d7165e9485d6d383a2cc9cef7cfd..00699bf4a7fdb67c6b9ee3548098b0c933fd39a4 100644 --- a/Documentation/netlink/specs/netdev.yaml +++ b/Documentation/netlink/specs/netdev.yaml @@ -61,6 +61,11 @@ definitions: doc: | Device is capable of exposing receive packet VLAN tag via bpf_xdp_metadata_rx_vlan_tag(). + - + name: checksum + doc: | + Device is capable of exposing receive checksum result via + bpf_xdp_metadata_rx_checksum(). - type: flags name: xsk-flags diff --git a/include/net/xdp.h b/include/net/xdp.h index aa742f413c358575396530879af4570dc3fc18de..9ab9ac10ae2074b70618a9d4f32544d8b9a30b63 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -586,6 +586,10 @@ 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, @@ -643,12 +647,22 @@ enum xdp_rss_hash_type { XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR, };
+enum xdp_checksum { + XDP_CHECKSUM_NONE = CHECKSUM_NONE, + XDP_CHECKSUM_UNNECESSARY = CHECKSUM_UNNECESSARY, + XDP_CHECKSUM_COMPLETE = CHECKSUM_COMPLETE, + XDP_CHECKSUM_PARTIAL = CHECKSUM_PARTIAL, +}; + struct xdp_metadata_ops { int (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp); int (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash, 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, + enum xdp_checksum *ip_summed, + u32 *cksum_meta); };
#ifdef CONFIG_NET diff --git a/net/core/xdp.c b/net/core/xdp.c index 9100e160113a9a1e2cb88e7602e85c5f36a9f3b9..4362a5d294c9117ab69dab00deefbd8fcd62d6cd 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: + * ``XDP_CHECKSUM_NONE`` + * ``XDP_CHECKSUM_UNNECESSARY`` + * ``XDP_CHECKSUM_COMPLETE`` + * ``XDP_CHECKSUM_PARTIAL`` + * + * In case of success, ``cksum_meta`` contains the hw computed checksum value + * for ``XDP_CHECKSUM_COMPLETE`` or the ``csum_level`` for + * ``XDP_CHECKSUM_UNNECESSARY``. It is set to 0 for ``XDP_CHECKSUM_NONE`` and + * ``XDP_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)