| From: |
| Eric Dumazet <edumazet-AT-google.com> |
| To: |
| "David S . Miller" <davem-AT-davemloft.net>, Jakub Kicinski <kuba-AT-kernel.org>, Paolo Abeni <pabeni-AT-redhat.com> |
| Subject: |
| [PATCH net-next 00/13] tcp: add optional usec resolution to TCP TS |
| Date: |
| Fri, 20 Oct 2023 12:57:35 +0000 |
| Message-ID: |
| <20231020125748.122792-1-edumazet@google.com> |
| Cc: |
| netdev-AT-vger.kernel.org, Neal Cardwell <ncardwell-AT-google.com>, Yuchung Cheng <ycheng-AT-google.com>, Kevin Yang <yyd-AT-google.com>, Soheil Hassas Yeganeh <soheil-AT-google.com>, Wei Wang <weiwan-AT-google.com>, Van Jacobson <vanj-AT-google.com>, Florian Westphal <fw-AT-strlen.de>, eric.dumazet-AT-gmail.com, Eric Dumazet <edumazet-AT-google.com> |
| Archive-link: |
| Article |
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...
https://datatracker.ietf.org/doc/draft-wang-tcpm-low-late...
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
