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| author | Stanislav Fomichev <sdf@google.com> | 2023-09-13 10:13:49 -0700 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2023-09-15 11:26:58 -0700 |
| commit | a9c2a608549bb1a2363d289d63907640afcf22af (patch) | |
| tree | 00e21fcf6e3ae2a3bbb5061f0dab1082350c3f47 /Documentation/networking | |
| parent | fc45c5b642dbcac3bb10f4f904e4b863233e5369 (diff) | |
| download | linux-a9c2a608549bb1a2363d289d63907640afcf22af.tar.gz | |
bpf: expose information about supported xdp metadata kfunc
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>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/xdp-rx-metadata.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst index 25ce72af81c21..205696780b789 100644 --- a/Documentation/networking/xdp-rx-metadata.rst +++ b/Documentation/networking/xdp-rx-metadata.rst @@ -105,6 +105,13 @@ bpf_tail_call Adding programs that access metadata kfuncs to the ``BPF_MAP_TYPE_PROG_ARRAY`` is currently not supported. +Supported Devices +================= + +It is possible to query which kfunc the particular netdev implements via +netlink. See ``xdp-rx-metadata-features`` attribute set in +``Documentation/netlink/specs/netdev.yaml``. + Example ======= |