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authorNeal Cardwell <ncardwell@google.com>2017-08-03 16:19:52 +0300
committerDavid S. Miller <davem@davemloft.net>2017-08-04 01:38:30 +0300
commite1a10ef7fa876f8510aaec36ea5c0cf34baba410 (patch)
tree6a584647a18d274929570b49b8c9140274db763d /include/net/tcp.h
parentb91d532928dff2141ea9c107c3e73104d9843767 (diff)
downloadlinux-e1a10ef7fa876f8510aaec36ea5c0cf34baba410.tar.xz
tcp: introduce tcp_rto_delta_us() helper for xmit timer fix
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: 6ba8a3b19e76 ("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>
Diffstat (limited to 'include/net/tcp.h')
-rw-r--r--include/net/tcp.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 70483296157f..ada65e767b28 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -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
*/