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[TCP] mtu probing: move tcp-specific data out of inet_connection_sock

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This moves some TCP-specific MTU probing state out of
inet_connection_sock back to tcp_sock.

Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Heffner 2006-03-20 21:32:58 -08:00 committed by David S. Miller
parent 1d541ddd74
commit 0e7b13685f
4 changed files with 10 additions and 6 deletions
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6
include/linux/tcp.h
View file

@ -343,6 +343,12 @@ struct tcp_sock {
__u32 seq;
__u32 time;
} rcvq_space;
/* TCP-specific MTU probe information. */
struct {
__u32 probe_seq_start;
__u32 probe_seq_end;
} mtu_probe;
};
static inline struct tcp_sock *tcp_sk(const struct sock *sk)

2
include/net/inet_connection_sock.h
View file

@ -114,8 +114,6 @@ struct inet_connection_sock {
/* Information on the current probe. */
int probe_size;
__u32 probe_seq_start;
__u32 probe_seq_end;
} icsk_mtup;
u32 icsk_ca_priv[16];
#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))

4
net/ipv4/tcp_input.c
View file

@ -2054,7 +2054,7 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una,
/* MTU probe failure: don't reduce cwnd */
if (icsk->icsk_ca_state < TCP_CA_CWR &&
icsk->icsk_mtup.probe_size &&
tp->snd_una == icsk->icsk_mtup.probe_seq_start) {
tp->snd_una == tp->mtu_probe.probe_seq_start) {
tcp_mtup_probe_failed(sk);
/* Restores the reduction we did in tcp_mtup_probe() */
tp->snd_cwnd++;
@ -2284,7 +2284,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
/* MTU probing checks */
if (icsk->icsk_mtup.probe_size) {
if (!after(icsk->icsk_mtup.probe_seq_end, TCP_SKB_CB(skb)->end_seq)) {
if (!after(tp->mtu_probe.probe_seq_end, TCP_SKB_CB(skb)->end_seq)) {
tcp_mtup_probe_success(sk, skb);
}
}

4
net/ipv4/tcp_output.c
View file

@ -1238,8 +1238,8 @@ static int tcp_mtu_probe(struct sock *sk)
update_send_head(sk, tp, nskb);
icsk->icsk_mtup.probe_size = tcp_mss_to_mtu(sk, nskb->len);
icsk->icsk_mtup.probe_seq_start = TCP_SKB_CB(nskb)->seq;
icsk->icsk_mtup.probe_seq_end = TCP_SKB_CB(nskb)->end_seq;
tp->mtu_probe.probe_seq_start = TCP_SKB_CB(nskb)->seq;
tp->mtu_probe.probe_seq_end = TCP_SKB_CB(nskb)->end_seq;
return 1;
}