diff options
| author |   Thomas Higdon <tph@fb.com> | 2019-09-13 23:23:35 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-09-16 16:26:11 +0200 |
| commit | 8f7baad7f03543451af27f5380fc816b008aa1f2 (patch) | |
| tree | 6bf8b48edf5926cfb1b372f611d41fffe872d237 /include/uapi | |
| parent | tcp: Add TCP_INFO counter for packets received out-of-order (diff) | |
| download | linux-dev-8f7baad7f03543451af27f5380fc816b008aa1f2.tar.xz linux-dev-8f7baad7f03543451af27f5380fc816b008aa1f2.zip | |
tcp: Add snd_wnd to TCP_INFO
Neal Cardwell mentioned that snd_wnd would be useful for diagnosing TCP
performance problems --
> (1) Usually when we're diagnosing TCP performance problems, we do so
> from the sender, since the sender makes most of the
> performance-critical decisions (cwnd, pacing, TSO size, TSQ, etc).
> From the sender-side the thing that would be most useful is to see
> tp->snd_wnd, the receive window that the receiver has advertised to
> the sender.
This serves the purpose of adding an additional __u32 to avoid the
would-be hole caused by the addition of the tcpi_rcvi_ooopack field.
Signed-off-by: Thomas Higdon <tph@fb.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/tcp.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 20237987ccc8..81e697978e8b 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -272,6 +272,10 @@ struct tcp_info { __u32 tcpi_reord_seen; /* reordering events seen */ __u32 tcpi_rcv_ooopack; /* Out-of-order packets received */ + + __u32 tcpi_snd_wnd; /* peer's advertised receive window after + * scaling (bytes) + */ }; /* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */ |