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Date: Fri, 7 Jul 2023 12:29:54 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
martin.lau@...ux.dev, song@...nel.org, yhs@...com, john.fastabend@...il.com,
kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
kuba@...nel.org, toke@...nel.org, willemb@...gle.com, dsahern@...nel.org,
magnus.karlsson@...el.com, bjorn@...nel.org, maciej.fijalkowski@...el.com,
hawk@...nel.org, netdev@...r.kernel.org, xdp-hints@...-project.net
Subject: [RFC bpf-next v3 02/14] bpf: Make it easier to add new metadata kfunc
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.
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
include/net/offload.h | 8 +++++---
kernel/bpf/offload.c | 13 +++++++------
net/core/xdp.c | 2 +-
3 files changed, 13 insertions(+), 10 deletions(-)
diff --git a/include/net/offload.h b/include/net/offload.h
index 264a35881473..de0fac38a95b 100644
--- a/include/net/offload.h
+++ b/include/net/offload.h
@@ -6,12 +6,14 @@
#define XDP_METADATA_KFUNC_xxx \
NETDEV_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \
- bpf_xdp_metadata_rx_timestamp) \
+ bpf_xdp_metadata_rx_timestamp, \
+ xmo_rx_timestamp) \
NETDEV_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
- bpf_xdp_metadata_rx_hash)
+ bpf_xdp_metadata_rx_hash, \
+ xmo_rx_hash)
enum {
-#define NETDEV_METADATA_KFUNC(name, _) name,
+#define NETDEV_METADATA_KFUNC(name, _, __) name,
XDP_METADATA_KFUNC_xxx
#undef NETDEV_METADATA_KFUNC
MAX_NETDEV_METADATA_KFUNC,
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 235d81f7e0ed..cec63c76dce5 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -844,10 +844,11 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
if (!ops)
goto out;
- if (func_id == bpf_dev_bound_kfunc_id(XDP_METADATA_KFUNC_RX_TIMESTAMP))
- p = ops->xmo_rx_timestamp;
- else if (func_id == bpf_dev_bound_kfunc_id(XDP_METADATA_KFUNC_RX_HASH))
- p = ops->xmo_rx_hash;
+#define NETDEV_METADATA_KFUNC(name, _, xmo) \
+ if (func_id == bpf_dev_bound_kfunc_id(name)) p = ops->xmo;
+ XDP_METADATA_KFUNC_xxx
+#undef NETDEV_METADATA_KFUNC
+
out:
up_read(&bpf_devs_lock);
@@ -855,13 +856,13 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
}
BTF_SET_START(dev_bound_kfunc_ids)
-#define NETDEV_METADATA_KFUNC(name, str) BTF_ID(func, str)
+#define NETDEV_METADATA_KFUNC(name, str, _) BTF_ID(func, str)
XDP_METADATA_KFUNC_xxx
#undef NETDEV_METADATA_KFUNC
BTF_SET_END(dev_bound_kfunc_ids)
BTF_ID_LIST(dev_bound_kfunc_ids_unsorted)
-#define NETDEV_METADATA_KFUNC(name, str) BTF_ID(func, str)
+#define NETDEV_METADATA_KFUNC(name, str, _) BTF_ID(func, str)
XDP_METADATA_KFUNC_xxx
#undef NETDEV_METADATA_KFUNC
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 819767697370..c4be4367f2dd 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 NETDEV_METADATA_KFUNC(_, name) BTF_ID_FLAGS(func, name, 0)
+#define NETDEV_METADATA_KFUNC(_, name, __) BTF_ID_FLAGS(func, name, 0)
XDP_METADATA_KFUNC_xxx
#undef NETDEV_METADATA_KFUNC
BTF_SET8_END(xdp_metadata_kfunc_ids)
--
2.41.0.255.g8b1d071c50-goog
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