netdev - [PATCH] netfilter: nf_flow_table_bpf: add prototype for bpf_xdp_flow

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Message-ID: <20260119091615.1880992-1-sun.jian.kdev@gmail.com>
Date: Mon, 19 Jan 2026 17:16:15 +0800
From: Sun Jian <sun.jian.kdev@...il.com>
To: fw@...len.de
Cc: pablo@...filter.org,
	phil@....cc,
	daniel@...earbox.net,
	ast@...nel.org,
	netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org,
	Sun Jian <sun.jian.kdev@...il.com>
Subject: [PATCH] netfilter: nf_flow_table_bpf: add prototype for bpf_xdp_flow_lookup()

Sparse reports:

  netfilter/nf_flow_table_bpf.c:58:45:
    symbol 'bpf_xdp_flow_lookup' was not declared. Should it be static?

bpf_xdp_flow_lookup() is exported as a __bpf_kfunc and must remain
non-static. Add a forward declaration to provide an explicit prototype
, only to silence the sparse warning.

No functional change intended.

Signed-off-by: Sun Jian <sun.jian.kdev@...il.com>
---
 net/netfilter/nf_flow_table_bpf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/netfilter/nf_flow_table_bpf.c b/net/netfilter/nf_flow_table_bpf.c
index 4a5f5195f2d2..a129e0ee5e81 100644
--- a/net/netfilter/nf_flow_table_bpf.c
+++ b/net/netfilter/nf_flow_table_bpf.c
@@ -31,6 +31,9 @@ __diag_ignore_all("-Wmissing-prototypes",
 		  "Global functions as their definitions will be in nf_flow_table BTF");
 
 __bpf_kfunc_start_defs();
+__bpf_kfunc struct flow_offload_tuple_rhash *
+bpf_xdp_flow_lookup(struct xdp_md *ctx, struct bpf_fib_lookup *fib_tuple,
+		    struct bpf_flowtable_opts *opts, u32 opts_len);
 
 static struct flow_offload_tuple_rhash *
 bpf_xdp_flow_tuple_lookup(struct net_device *dev,
-- 
2.43.0