netdev - [PATCH net-next 00/13] tcp: add optional usec resolution to TCP TS

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Date: Fri, 20 Oct 2023 12:57:35 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Neal Cardwell <ncardwell@...gle.com>, 
	Yuchung Cheng <ycheng@...gle.com>, Kevin Yang <yyd@...gle.com>, 
	Soheil Hassas Yeganeh <soheil@...gle.com>, Wei Wang <weiwan@...gle.com>, Van Jacobson <vanj@...gle.com>, 
	Florian Westphal <fw@...len.de>, eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 00/13] tcp: add optional usec resolution to TCP TS

As discussed in various public places in 2016, Google adopted
usec resolution in RFC 7323 TS values, at Van Jacobson suggestion.

Goals were :

1) better observability of delays in networking stacks/fabrics.

2) better disambiguation of events based on TSval/ecr values.

3) building block for congestion control modules needing usec resolution.

Back then we implemented a schem based on private SYN options
to safely negotiate the feature.

For upstream submission, we chose to use a much simpler route
attribute because this feature is probably going to be used
in private networks.

ip route add 10/8 ... features tcp_usec_ts

References:

https://www.ietf.org/proceedings/97/slides/slides-97-tcpm-tcp-options-for-low-latency-00.pdf
https://datatracker.ietf.org/doc/draft-wang-tcpm-low-latency-opt/

First two patches are fixing old minor bugs and might be taken
by stable teams (thanks to appropriate Fixes: tags)

Eric Dumazet (13):
  chtls: fix tp->rcv_tstamp initialization
  tcp: fix cookie_init_timestamp() overflows
  tcp: add tcp_time_stamp_ms() helper
  tcp: introduce tcp_clock_ms()
  tcp: replace tcp_time_stamp_raw()
  tcp: rename tcp_skb_timestamp()
  tcp: move tcp_ns_to_ts() to net/ipv4/syncookies.c
  tcp: rename tcp_time_stamp() to tcp_time_stamp_ts()
  tcp: add tcp_rtt_tsopt_us()
  tcp: add RTAX_FEATURE_TCP_USEC_TS
  tcp: introduce TCP_PAWS_WRAP
  tcp: add support for usec resolution in TCP TS values
  tcp: add TCPI_OPT_USEC_TS

 .../chelsio/inline_crypto/chtls/chtls_cm.c    |  2 +-
 include/linux/tcp.h                           |  9 ++-
 include/net/inet_timewait_sock.h              |  3 +-
 include/net/tcp.h                             | 59 ++++++++++++++-----
 include/uapi/linux/rtnetlink.h                | 18 +++---
 include/uapi/linux/tcp.h                      |  1 +
 net/ipv4/syncookies.c                         | 32 ++++++----
 net/ipv4/tcp.c                                | 26 +++++---
 net/ipv4/tcp_input.c                          | 52 ++++++++--------
 net/ipv4/tcp_ipv4.c                           |  5 +-
 net/ipv4/tcp_lp.c                             |  2 +-
 net/ipv4/tcp_minisocks.c                      | 19 ++++--
 net/ipv4/tcp_output.c                         | 14 +++--
 net/ipv4/tcp_timer.c                          | 44 +++++++++-----
 net/ipv6/tcp_ipv6.c                           |  5 +-
 net/netfilter/nf_synproxy_core.c              |  2 +-
 .../selftests/bpf/progs/xdp_synproxy_kern.c   |  4 +-
 17 files changed, 193 insertions(+), 104 deletions(-)

-- 
2.42.0.655.g421f12c284-goog