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bpf: expose information about supported xdp metadata kfunc

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Add new xdp-rx-metadata-features member to netdev netlink
which exports a bitmask of supported kfuncs. Most of the patch
is autogenerated (headers), the only relevant part is netdev.yaml
and the changes in netdev-genl.c to marshal into netlink.

Example output on veth:

$ ip link add veth0 type veth peer name veth1 # ifndex == 12
$ ./tools/net/ynl/samples/netdev 12

Select ifc ($ifindex; or 0 = dump; or -2 ntf check): 12
   veth1[12]    xdp-features (23): basic redirect rx-sg xdp-rx-metadata-features (3): timestamp hash xdp-zc-max-segs=0

Cc: netdev@vger.kernel.org
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20230913171350.369987-3-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Stanislav Fomichev
2023-09-13 10:13:49 -07:00
committed by Andrii Nakryiko
parent 6f30f1a00a
commit 6070b1bdcf
1 changed files with 16 additions and 0 deletions
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16
include/uapi/linux/netdev.h
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@@ -38,11 +38,27 @@ enum netdev_xdp_act {
NETDEV_XDP_ACT_MASK = 127,
};
/**
* enum netdev_xdp_rx_metadata
* @NETDEV_XDP_RX_METADATA_TIMESTAMP: Device is capable of exposing receive HW
* timestamp via bpf_xdp_metadata_rx_timestamp().
* @NETDEV_XDP_RX_METADATA_HASH: Device is capable of exposing receive packet
* hash via bpf_xdp_metadata_rx_hash().
*/
enum netdev_xdp_rx_metadata {
NETDEV_XDP_RX_METADATA_TIMESTAMP = 1,
NETDEV_XDP_RX_METADATA_HASH = 2,
/* private: */
NETDEV_XDP_RX_METADATA_MASK = 3,
};
enum {
NETDEV_A_DEV_IFINDEX = 1,
NETDEV_A_DEV_PAD,
NETDEV_A_DEV_XDP_FEATURES,
NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
__NETDEV_A_DEV_MAX,
NETDEV_A_DEV_MAX = (__NETDEV_A_DEV_MAX - 1)