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@xxxxxxxxxxxxxxx
Cc: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxx>
---
include/net/xdp.h | 16 ++++++++++++----
kernel/bpf/offload.c | 9 +++++----
net/core/xdp.c | 4 ++--
3 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/include/net/xdp.h b/include/net/xdp.h
index de08c8e0d134..d59e12f8f311 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -383,14 +383,22 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
#define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE
+/* Define the relationship between xdp-rx-metadata kfunc and
+ * various other entities:
+ * - xdp_rx_metadata enum
+ * - kfunc name
+ * - xdp_metadata_ops field
+ */
#define XDP_METADATA_KFUNC_xxx \
XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \
- bpf_xdp_metadata_rx_timestamp) \
+ bpf_xdp_metadata_rx_timestamp, \
+ xmo_rx_timestamp) \
XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
- bpf_xdp_metadata_rx_hash) \
+ bpf_xdp_metadata_rx_hash, \
+ xmo_rx_hash) \
-enum {
-#define XDP_METADATA_KFUNC(name, _) name,
+enum xdp_rx_metadata {
+#define XDP_METADATA_KFUNC(name, _, __) name,
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
MAX_XDP_METADATA_KFUNC,
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 3e4f2ec1af06..6aa6de8d715d 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -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);
diff --git a/net/core/xdp.c b/net/core/xdp.c
index a70670fe9a2d..bab563b2f812 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -741,7 +741,7 @@ __bpf_kfunc int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, u32 *hash,
__diag_pop();
BTF_SET8_START(xdp_metadata_kfunc_ids)
-#define XDP_METADATA_KFUNC(_, name) BTF_ID_FLAGS(func, name, KF_TRUSTED_ARGS)
+#define XDP_METADATA_KFUNC(_, name, __) BTF_ID_FLAGS(func, name, KF_TRUSTED_ARGS)
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
BTF_SET8_END(xdp_metadata_kfunc_ids)
@@ -752,7 +752,7 @@ static const struct btf_kfunc_id_set xdp_metadata_kfunc_set = {
};
BTF_ID_LIST(xdp_metadata_kfunc_ids_unsorted)
-#define XDP_METADATA_KFUNC(name, str) BTF_ID(func, str)
+#define XDP_METADATA_KFUNC(name, str, _) BTF_ID(func, str)
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
--
2.42.0.283.g2d96d420d3-goog
