Implement functionality that enables drivers to expose VLAN tag to XDP code. Signed-off-by: Larysa Zaremba <larysa.zaremba@xxxxxxxxx> --- Documentation/networking/xdp-rx-metadata.rst | 11 ++++++++- include/linux/netdevice.h | 2 ++ include/net/xdp.h | 4 ++++ kernel/bpf/offload.c | 4 ++++ net/core/xdp.c | 24 ++++++++++++++++++++ 5 files changed, 44 insertions(+), 1 deletion(-) diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst index 25ce72af81c2..73a78029c596 100644 --- a/Documentation/networking/xdp-rx-metadata.rst +++ b/Documentation/networking/xdp-rx-metadata.rst @@ -18,7 +18,16 @@ Currently, the following kfuncs are supported. In the future, as more metadata is supported, this set will grow: .. kernel-doc:: net/core/xdp.c - :identifiers: bpf_xdp_metadata_rx_timestamp bpf_xdp_metadata_rx_hash + :identifiers: bpf_xdp_metadata_rx_timestamp + +.. kernel-doc:: net/core/xdp.c + :identifiers: bpf_xdp_metadata_rx_hash + +.. kernel-doc:: net/core/xdp.c + :identifiers: bpf_xdp_metadata_rx_ctag + +.. kernel-doc:: net/core/xdp.c + :identifiers: bpf_xdp_metadata_rx_stag An XDP program can use these kfuncs to read the metadata into stack variables for its own consumption. Or, to pass the metadata on to other diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 08fbd4622ccf..fdae37fe11f5 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1655,6 +1655,8 @@ 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_ctag)(const struct xdp_md *ctx, u16 *vlan_tag); + int (*xmo_rx_stag)(const struct xdp_md *ctx, u16 *vlan_tag); }; /** diff --git a/include/net/xdp.h b/include/net/xdp.h index 6381560efae2..2db7439fc60f 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -389,6 +389,10 @@ void xdp_attachment_setup(struct xdp_attachment_info *info, bpf_xdp_metadata_rx_timestamp) \ XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \ bpf_xdp_metadata_rx_hash) \ + XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CTAG, \ + bpf_xdp_metadata_rx_ctag) \ + XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_STAG, \ + bpf_xdp_metadata_rx_stag) \ enum { #define XDP_METADATA_KFUNC(name, _) name, diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c index d9c9f45e3529..2c6b6e82cfac 100644 --- a/kernel/bpf/offload.c +++ b/kernel/bpf/offload.c @@ -848,6 +848,10 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id) p = ops->xmo_rx_timestamp; else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_HASH)) p = ops->xmo_rx_hash; + else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_CTAG)) + p = ops->xmo_rx_ctag; + else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_STAG)) + p = ops->xmo_rx_stag; out: up_read(&bpf_devs_lock); diff --git a/net/core/xdp.c b/net/core/xdp.c index 41e5ca8643ec..eff21501609f 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -738,6 +738,30 @@ __bpf_kfunc int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, u32 *hash, return -EOPNOTSUPP; } +/** + * bpf_xdp_metadata_rx_ctag - Read XDP packet inner vlan tag. + * @ctx: XDP context pointer. + * @vlan_tag: Return value pointer. + * + * Returns 0 on success or ``-errno`` on error. + */ +__bpf_kfunc int bpf_xdp_metadata_rx_ctag(const struct xdp_md *ctx, u16 *vlan_tag) +{ + return -EOPNOTSUPP; +} + +/** + * bpf_xdp_metadata_rx_stag - Read XDP packet outer vlan tag. + * @ctx: XDP context pointer. + * @vlan_tag: Return value pointer. + * + * Returns 0 on success or ``-errno`` on error. + */ +__bpf_kfunc int bpf_xdp_metadata_rx_stag(const struct xdp_md *ctx, u16 *vlan_tag) +{ + return -EOPNOTSUPP; +} + __diag_pop(); BTF_SET8_START(xdp_metadata_kfunc_ids) -- 2.35.3