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tcp: introduce tcp_rto_delta_us() helper for xmit timer fix

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Pure refactor. This helper will be required in the xmit timer fix
later in the patch series. (Because the TLP logic will want to make
this calculation.)

Fixes: 6ba8a3b19e ("tcp: Tail loss probe (TLP)")
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neal Cardwell 2017-08-03 09:19:52 -04:00 committed by David S. Miller
parent b91d532928
commit e1a10ef7fa
2 changed files with 11 additions and 4 deletions
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10
include/net/tcp.h
View File

@ -1916,6 +1916,16 @@ extern void tcp_rack_advance(struct tcp_sock *tp, u8 sacked, u32 end_seq,
u64 xmit_time);
extern void tcp_rack_reo_timeout(struct sock *sk);
/* At how many usecs into the future should the RTO fire? */
static inline s64 tcp_rto_delta_us(const struct sock *sk)
{
const struct sk_buff *skb = tcp_write_queue_head(sk);
u32 rto = inet_csk(sk)->icsk_rto;
u64 rto_time_stamp_us = skb->skb_mstamp + jiffies_to_usecs(rto);
return rto_time_stamp_us - tcp_sk(sk)->tcp_mstamp;
}
/*
* Save and compile IPv4 options, return a pointer to it
*/

5
net/ipv4/tcp_input.c
View File

@ -3004,10 +3004,7 @@ void tcp_rearm_rto(struct sock *sk)
/* Offset the time elapsed after installing regular RTO */
if (icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
struct sk_buff *skb = tcp_write_queue_head(sk);
u64 rto_time_stamp = skb->skb_mstamp +
jiffies_to_usecs(rto);
s64 delta_us = rto_time_stamp - tp->tcp_mstamp;
s64 delta_us = tcp_rto_delta_us(sk);
/* delta_us may not be positive if the socket is locked
* when the retrans timer fires and is rescheduled.
*/