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Commit dd2e0b86 authored Jun 19, 2020 by Eric Dumazet Committed by David S. Miller Jun 20, 2020

tcp: remove indirect calls for icsk->icsk_af_ops->send_check



Mitigate RETPOLINE costs in __tcp_transmit_skb()
by using INDIRECT_CALL_INET() wrapper.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 05e22e83

include/net/ip6_checksum.h

+0 −9

Original line number	Original line	Diff line number	Diff line
	@@ -85,15 +85,6 @@ static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb)
	th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);		th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
	}		}

	#if IS_ENABLED(CONFIG_IPV6)
	static inline void tcp_v6_send_check(struct sock sk, struct sk_buff skb)
	{
	struct ipv6_pinfo *np = inet6_sk(sk);

	__tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
	}
	#endif

	static inline __sum16 udp_v6_check(int len,		static inline __sum16 udp_v6_check(int len,
	const struct in6_addr *saddr,		const struct in6_addr *saddr,
	const struct in6_addr *daddr,		const struct in6_addr *daddr,

include/net/tcp.h

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -932,6 +932,9 @@ static inline int tcp_v6_sdif(const struct sk_buff *skb)
	#endif		#endif
	return 0;		return 0;
	}		}

			INDIRECT_CALLABLE_DECLARE(void tcp_v6_send_check(struct sock sk, struct sk_buff skb));

	#endif		#endif

	static inline bool inet_exact_dif_match(struct net net, struct sk_buff skb)		static inline bool inet_exact_dif_match(struct net net, struct sk_buff skb)

net/ipv4/tcp_output.c

+4 −1

Original line number	Original line	Diff line number	Diff line
	@@ -1066,6 +1066,7 @@ static void tcp_update_skb_after_send(struct sock sk, struct sk_buff skb,

	INDIRECT_CALLABLE_DECLARE(int ip_queue_xmit(struct sock sk, struct sk_buff skb, struct flowi *fl));		INDIRECT_CALLABLE_DECLARE(int ip_queue_xmit(struct sock sk, struct sk_buff skb, struct flowi *fl));
	INDIRECT_CALLABLE_DECLARE(int inet6_csk_xmit(struct sock sk, struct sk_buff skb, struct flowi *fl));		INDIRECT_CALLABLE_DECLARE(int inet6_csk_xmit(struct sock sk, struct sk_buff skb, struct flowi *fl));
			INDIRECT_CALLABLE_DECLARE(void tcp_v4_send_check(struct sock sk, struct sk_buff skb));

	/* This routine actually transmits TCP packets queued in by		/* This routine actually transmits TCP packets queued in by
	* tcp_do_sendmsg(). This is used by both the initial		* tcp_do_sendmsg(). This is used by both the initial
	@@ -1210,7 +1211,9 @@ static int __tcp_transmit_skb(struct sock sk, struct sk_buff skb,
	}		}
	#endif		#endif

	icsk->icsk_af_ops->send_check(sk, skb);		INDIRECT_CALL_INET(icsk->icsk_af_ops->send_check,
			tcp_v6_send_check, tcp_v4_send_check,
			sk, skb);

	if (likely(tcb->tcp_flags & TCPHDR_ACK))		if (likely(tcb->tcp_flags & TCPHDR_ACK))
	tcp_event_ack_sent(sk, tcp_skb_pcount(skb), rcv_nxt);		tcp_event_ack_sent(sk, tcp_skb_pcount(skb), rcv_nxt);

net/ipv6/tcp_ipv6.c

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1811,6 +1811,13 @@ static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_destructor = tcp_twsk_destructor,		.twsk_destructor = tcp_twsk_destructor,
	};		};

			INDIRECT_CALLABLE_SCOPE void tcp_v6_send_check(struct sock sk, struct sk_buff skb)
			{
			struct ipv6_pinfo *np = inet6_sk(sk);

			__tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
			}

	const struct inet_connection_sock_af_ops ipv6_specific = {		const struct inet_connection_sock_af_ops ipv6_specific = {
	.queue_xmit = inet6_csk_xmit,		.queue_xmit = inet6_csk_xmit,
	.send_check = tcp_v6_send_check,		.send_check = tcp_v6_send_check,

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