netdev - [PATCH v4 net-next 00/15] inet: socket lock and data-races avoidance

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Date: Wed, 16 Aug 2023 08:15:32 +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: Simon Horman <simon.horman@...igine.com>, Soheil Hassas Yeganeh <soheil@...gle.com>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v4 net-next 00/15] inet: socket lock and data-races avoidance

In this series, I converted 20 bits in "struct inet_sock" and made
them truly atomic.

This allows to implement many IP_ socket options in a lockless
fashion (no need to acquire socket lock), and fixes data-races
that were showing up in various KCSAN reports.

I also took care of IP_TTL/IP_MINTTL, but left few other options
for another series.

v4: Rebased after recent mptcp changes.
  Added Reviewed-by: tags from Simon (thanks !)

v3: fixed patch 7, feedback from build bot about ipvs set_mcast_loop()

v2: addressed a feedback from a build bot in patch 9 by removing
 unused issk variable in mptcp_setsockopt_sol_ip_set_transparent()
 Added Acked-by: tags from Soheil (thanks !)

Eric Dumazet (15):
  inet: introduce inet->inet_flags
  inet: set/get simple options locklessly
  inet: move inet->recverr to inet->inet_flags
  inet: move inet->recverr_rfc4884 to inet->inet_flags
  inet: move inet->freebind to inet->inet_flags
  inet: move inet->hdrincl to inet->inet_flags
  inet: move inet->mc_loop to inet->inet_frags
  inet: move inet->mc_all to inet->inet_frags
  inet: move inet->transparent to inet->inet_flags
  inet: move inet->is_icsk to inet->inet_flags
  inet: move inet->nodefrag to inet->inet_flags
  inet: move inet->bind_address_no_port to inet->inet_flags
  inet: move inet->defer_connect to inet->inet_flags
  inet: implement lockless IP_TTL
  inet: implement lockless IP_MINTTL

 include/net/inet_connection_sock.h  |   4 +-
 include/net/inet_sock.h             |  92 ++++---
 include/net/ipv6.h                  |   3 +-
 include/net/route.h                 |   2 +-
 include/net/tcp.h                   |   2 +-
 net/core/sock.c                     |   2 +-
 net/dccp/ipv4.c                     |   4 +-
 net/ipv4/af_inet.c                  |  16 +-
 net/ipv4/cipso_ipv4.c               |   4 +-
 net/ipv4/igmp.c                     |   2 +-
 net/ipv4/inet_diag.c                |  22 +-
 net/ipv4/inet_timewait_sock.c       |   2 +-
 net/ipv4/ip_output.c                |   7 +-
 net/ipv4/ip_sockglue.c              | 405 +++++++++++++---------------
 net/ipv4/netfilter/nf_defrag_ipv4.c |   2 +-
 net/ipv4/ping.c                     |   7 +-
 net/ipv4/raw.c                      |  26 +-
 net/ipv4/route.c                    |   8 +-
 net/ipv4/tcp.c                      |  12 +-
 net/ipv4/tcp_fastopen.c             |   2 +-
 net/ipv4/tcp_input.c                |   2 +-
 net/ipv4/tcp_ipv4.c                 |   5 +-
 net/ipv4/tcp_minisocks.c            |   3 +-
 net/ipv4/udp.c                      |   7 +-
 net/ipv4/udp_tunnel_core.c          |   2 +-
 net/ipv6/af_inet6.c                 |   8 +-
 net/ipv6/datagram.c                 |   2 +-
 net/ipv6/ip6_output.c               |   5 +-
 net/ipv6/ipv6_sockglue.c            |  12 +-
 net/ipv6/raw.c                      |  16 +-
 net/ipv6/udp.c                      |   2 +-
 net/l2tp/l2tp_ip.c                  |   2 +-
 net/mptcp/protocol.c                |  10 +-
 net/mptcp/sockopt.c                 |  18 +-
 net/netfilter/ipvs/ip_vs_core.c     |   4 +-
 net/netfilter/ipvs/ip_vs_sync.c     |   4 +-
 net/sctp/input.c                    |   2 +-
 net/sctp/protocol.c                 |   2 +-
 net/sctp/socket.c                   |   2 +-
 39 files changed, 362 insertions(+), 370 deletions(-)

-- 
2.41.0.694.ge786442a9b-goog