diff options
| author | Jie Meng <jmeng@fb.com> | 2022-08-15 13:29:00 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-08-17 10:19:22 +0100 |
| commit | 8ea731d4c2ce721a29b17c7a1ee82c28b80f00ba (patch) | |
| tree | 7e8a887c40fac1f9f5baba2ff2354e3b03be4886 | |
| parent | cfc111d5391dda87310e7a385a9e17f300a8a97c (diff) | |
tcp: Make SYN ACK RTO tunable by BPF programs with TFO
Instead of the hardcoded TCP_TIMEOUT_INIT, this diff calls tcp_timeout_init
to initiate req->timeout like the non TFO SYN ACK case.
Tested using the following packetdrill script, on a host with a BPF
program that sets the initial connect timeout to 10ms.
`../../common/defaults.sh`
// Initialize connection
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
+0 < S 0:0(0) win 32792 <mss 1000,sackOK,FO TFO_COOKIE>
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
+.01 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
+.02 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
+.04 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
+.01 < . 1:1(0) ack 1 win 32792
+0 accept(3, ..., ...) = 4
Signed-off-by: Jie Meng <jmeng@fb.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_fastopen.c | 3 | ||||
| -rw-r--r-- | net/ipv4/tcp_timer.c | 2 |
2 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c index 825b216d11f5..45cc7f1ca296 100644 --- a/net/ipv4/tcp_fastopen.c +++ b/net/ipv4/tcp_fastopen.c @@ -272,8 +272,9 @@ static struct sock *tcp_fastopen_create_child(struct sock *sk, * The request socket is not added to the ehash * because it's been added to the accept queue directly. */ + req->timeout = tcp_timeout_init(child); inet_csk_reset_xmit_timer(child, ICSK_TIME_RETRANS, - TCP_TIMEOUT_INIT, TCP_RTO_MAX); + req->timeout, TCP_RTO_MAX); refcount_set(&req->rsk_refcnt, 2); diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index b4dfb82d6ecb..cb79127f45c3 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -428,7 +428,7 @@ static void tcp_fastopen_synack_timer(struct sock *sk, struct request_sock *req) if (!tp->retrans_stamp) tp->retrans_stamp = tcp_time_stamp(tp); inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, - TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX); + req->timeout << req->num_timeout, TCP_RTO_MAX); } |