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Commit 0e7b1368 authored Mar 20, 2006 by John Heffner Committed by David S. Miller Mar 20, 2006

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



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>

parent 1d541ddd

include/linux/tcp.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -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)

include/net/inet_connection_sock.h

+0 −2

Original line number	Diff line number	Diff line
		@@ -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))

net/ipv4/tcp_input.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}
		}

net/ipv4/tcp_output.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}