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tcp: minor optimization around tcp_hdr() usage in receive path 

This is additional to the
commit ea1627c20c ("tcp: minor optimizations around tcp_hdr() usage").
At this point, skb->data is same with tcp_hdr() as tcp header has not
been pulled yet. So use the less expensive one to get the tcp header.

Remove the third parameter of tcp_rcv_established() and put it into
the function body.

Furthermore, the local variables are listed as a reverse christmas tree :)

Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yafang Shao 2018-05-29 23:27:31 +08:00 committed by David S. Miller
parent 0c3a4cf84f
commit 3d97d88e80
5 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/tcp.h
View File

@ -334,8 +334,7 @@ void tcp_write_timer_handler(struct sock *sk);
void tcp_delack_timer_handler(struct sock *sk);
int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb);
void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th);
void tcp_rcv_established(struct sock *sk, struct sk_buff *skb);
void tcp_rcv_space_adjust(struct sock *sk);
int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
void tcp_twsk_destructor(struct sock *sk);

5
include/trace/events/tcp.h
View File

@ -248,8 +248,9 @@ TRACE_EVENT(tcp_probe,
),
TP_fast_assign(
const struct tcp_sock *tp = tcp_sk(sk);
const struct tcphdr *th = (const struct tcphdr *)skb->data;
const struct inet_sock *inet = inet_sk(sk);
const struct tcp_sock *tp = tcp_sk(sk);
memset(__entry->saddr, 0, sizeof(struct sockaddr_in6));
memset(__entry->daddr, 0, sizeof(struct sockaddr_in6));
@ -261,7 +262,7 @@ TRACE_EVENT(tcp_probe,
__entry->dport = ntohs(inet->inet_dport);
__entry->mark = skb->mark;
__entry->data_len = skb->len - tcp_hdrlen(skb);
__entry->data_len = skb->len - __tcp_hdrlen(th);
__entry->snd_nxt = tp->snd_nxt;
__entry->snd_una = tp->snd_una;
__entry->snd_cwnd = tp->snd_cwnd;

6
net/ipv4/tcp_input.c
View File

@ -5390,11 +5390,11 @@ discard:
* the rest is checked inline. Fast processing is turned on in
* tcp_data_queue when everything is OK.
*/
void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th)
void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
{
unsigned int len = skb->len;
const struct tcphdr *th = (const struct tcphdr *)skb->data;
struct tcp_sock *tp = tcp_sk(sk);
unsigned int len = skb->len;
/* TCP congestion window tracking */
trace_tcp_probe(sk, skb);

2
net/ipv4/tcp_ipv4.c
View File

@ -1486,7 +1486,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
sk->sk_rx_dst = NULL;
}
}
tcp_rcv_established(sk, skb, tcp_hdr(skb));
tcp_rcv_established(sk, skb);
return 0;
}

2
net/ipv6/tcp_ipv6.c
View File

@ -1322,7 +1322,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
}
}
tcp_rcv_established(sk, skb, tcp_hdr(skb));
tcp_rcv_established(sk, skb);
if (opt_skb)
goto ipv6_pktoptions;
return 0;