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bpf: make it easier to add new metadata kfunc

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No functional changes.

Instead of having hand-crafted code in bpf_dev_bound_resolve_kfunc,
move kfunc <> xmo handler relationship into XDP_METADATA_KFUNC_xxx.
This way, any time new kfunc is added, we don't have to touch
bpf_dev_bound_resolve_kfunc.

Also document XDP_METADATA_KFUNC_xxx arguments since we now have
more than two and it might be confusing what is what.

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/20230913171350.369987-2-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Stanislav Fomichev
2023-09-13 10:13:48 -07:00
committed by Martin KaFai Lau
parent d609f3d228
commit fc45c5b642
3 changed files with 19 additions and 10 deletions
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9
kernel/bpf/offload.c
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@@ -845,10 +845,11 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
if (!ops)
goto out;
if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_TIMESTAMP))
p = ops->xmo_rx_timestamp;
else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_HASH))
p = ops->xmo_rx_hash;
#define XDP_METADATA_KFUNC(name, _, xmo) \
if (func_id == bpf_xdp_metadata_kfunc_id(name)) p = ops->xmo;
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
out:
up_read(&bpf_devs_lock);