diff options
| -rw-r--r-- | include/net/tcp.h | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index b4dc93dae98c..4b45be570821 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -700,11 +700,14 @@ u32 __tcp_select_window(struct sock *sk); void tcp_send_window_probe(struct sock *sk); -/* TCP timestamps are only 32-bits, this causes a slight - * complication on 64-bit systems since we store a snapshot - * of jiffies in the buffer control blocks below. We decided - * to use only the low 32-bits of jiffies and hide the ugly - * casts with the following macro. +/* TCP uses 32bit jiffies to save some space. + * Note that this is different from tcp_time_stamp, which + * historically has been the same until linux-4.13. + */ +#define tcp_jiffies32 ((u32)jiffies) + +/* Generator for TCP TS option (RFC 7323) + * Currently tied to 'jiffies' but will soon be driven by 1 ms clock. */ #define tcp_time_stamp ((__u32)(jiffies)) |