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

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>
This commit is contained in:
Eric Dumazet 2020-06-19 12:12:34 -07:00 committed by David S. Miller
parent 902053f17d
commit 05e22e8395
4 changed files with 14 additions and 6 deletions
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6
include/net/ip.h
View File

@ -231,11 +231,7 @@ struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
struct ipcm_cookie *ipc, struct rtable **rtp,
struct inet_cork *cork, unsigned int flags);
static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb,
struct flowi *fl)
{
return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos);
}
int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
{

1
include/net/tcp.h
View File

@ -25,6 +25,7 @@
#include <linux/skbuff.h>
#include <linux/kref.h>
#include <linux/ktime.h>
#include <linux/indirect_call_wrapper.h>
#include <net/inet_connection_sock.h>
#include <net/inet_timewait_sock.h>

6
net/ipv4/ip_output.c
View File

@ -539,6 +539,12 @@ no_route:
}
EXPORT_SYMBOL(__ip_queue_xmit);
int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
{
return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos);
}
EXPORT_SYMBOL(ip_queue_xmit);
static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from)
{
to->pkt_type = from->pkt_type;

7
net/ipv4/tcp_output.c
View File

@ -1064,6 +1064,9 @@ static void tcp_update_skb_after_send(struct sock *sk, struct sk_buff *skb,
list_move_tail(&skb->tcp_tsorted_anchor, &tp->tsorted_sent_queue);
}
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));
/* This routine actually transmits TCP packets queued in by
* tcp_do_sendmsg(). This is used by both the initial
* transmission and possible later retransmissions.
@ -1235,7 +1238,9 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb,
tcp_add_tx_delay(skb, tp);
err = icsk->icsk_af_ops->queue_xmit(sk, skb, &inet->cork.fl);
err = INDIRECT_CALL_INET(icsk->icsk_af_ops->queue_xmit,
inet6_csk_xmit, ip_queue_xmit,
sk, skb, &inet->cork.fl);
if (unlikely(err > 0)) {
tcp_enter_cwr(sk);