Commit a35b6e48 authored Feb 05, 2026 by Eric Dumazet Committed by Jakub Kicinski Feb 06, 2026

tcp: inline tcp_filter()



This helper is already (auto)inlined from IPv4 TCP stack.

Make it an inline function to benefit IPv6 as well.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/2 grow/shrink: 1/0 up/down: 30/-49 (-19)
Function                                     old     new   delta
tcp_v6_rcv                                  3448    3478     +30
__pfx_tcp_filter                              16       -     -16
tcp_filter                                    33       -     -33
Total: Before=24891904, After=24891885, chg -0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260205164329.3401481-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>

parent fd241734

include/net/tcp.h

+7 −1

Original line number	Diff line number	Diff line
		@@ -1633,8 +1633,14 @@ static inline bool tcp_checksum_complete(struct sk_buff *skb)
		bool tcp_add_backlog(struct sock sk, struct sk_buff skb,
		enum skb_drop_reason *reason);

		static inline int tcp_filter(struct sock sk, struct sk_buff skb,
		enum skb_drop_reason *reason)
		{
		const struct tcphdr th = (const struct tcphdr )skb->data;

		return sk_filter_trim_cap(sk, skb, __tcp_hdrlen(th), reason);
		}

		int tcp_filter(struct sock sk, struct sk_buff skb, enum skb_drop_reason *reason);
		void tcp_set_state(struct sock *sk, int state);
		void tcp_done(struct sock *sk);
		int tcp_abort(struct sock *sk, int err);

net/ipv4/tcp_ipv4.c

+0 −8

Original line number	Diff line number	Diff line
		@@ -2109,14 +2109,6 @@ bool tcp_add_backlog(struct sock sk, struct sk_buff skb,
		}
		EXPORT_IPV6_MOD(tcp_add_backlog);

		int tcp_filter(struct sock sk, struct sk_buff skb, enum skb_drop_reason *reason)
		{
		struct tcphdr th = (struct tcphdr )skb->data;

		return sk_filter_trim_cap(sk, skb, th->doff * 4, reason);
		}
		EXPORT_IPV6_MOD(tcp_filter);

		static void tcp_v4_restore_cb(struct sk_buff *skb)
		{
		memmove(IPCB(skb), &TCP_SKB_CB(skb)->header.h4,