netdev - [PATCH v2 net-next 0/6] udp: Introduce optional per-netns hash table.

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Date:   Thu, 10 Nov 2022 20:00:28 -0800
From:   Kuniyuki Iwashima <kuniyu@...zon.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     Kuniyuki Iwashima <kuniyu@...zon.com>,
        Kuniyuki Iwashima <kuni1840@...il.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 0/6] udp: Introduce optional per-netns hash table.

This series is the UDP version of the per-netns ehash series [0],
which were initially in the same patch set. [1]

The notable difference with TCP is the max table size is 64K.  This
is because the possible hash range by udp_hashfn() always fits in 64K
within the same netns.  Also, the UDP per-netns table isolates both
1-tuple and 2-tuple tables.

For details, please see the last patch.

  patch 1 - 4: prep for per-netns hash table
  patch     5: allocate bitmap beforehand for udp_lib_get_port() and smaller
               hash table
  patch     6: add per-netns hash table

[0]: https://lore.kernel.org/netdev/20220908011022.45342-1-kuniyu@amazon.com/
[1]: https://lore.kernel.org/netdev/20220826000445.46552-1-kuniyu@amazon.com/


Changes:
  v3:
    * Drop get_port() fix (posted separately later)
    * Patch 3
      * Fix CONFIG_PROC_FS=n build failure (kernel test robot)
    * Patch 5
      * Allocate bitmap when creating netns (Paolo Abeni)

  v2: https://lore.kernel.org/netdev/20221104190612.24206-1-kuniyu@amazon.com/

  v1: [1]


Kuniyuki Iwashima (6):
  udp: Clean up some functions.
  udp: Set NULL to sk->sk_prot->h.udp_table.
  udp: Set NULL to udp_seq_afinfo.udp_table.
  udp: Access &udp_table via net.
  udp: Add bitmap in udp_table.
  udp: Introduce optional per-netns hash table.

 Documentation/networking/ip-sysctl.rst |  27 ++++
 include/linux/udp.h                    |   2 +
 include/net/netns/ipv4.h               |   3 +
 include/net/udp.h                      |  20 +++
 net/core/filter.c                      |   4 +-
 net/ipv4/sysctl_net_ipv4.c             |  38 +++++
 net/ipv4/udp.c                         | 205 ++++++++++++++++++++-----
 net/ipv4/udp_diag.c                    |   6 +-
 net/ipv4/udp_offload.c                 |   5 +-
 net/ipv6/udp.c                         |  31 ++--
 net/ipv6/udp_offload.c                 |   5 +-
 11 files changed, 287 insertions(+), 59 deletions(-)

-- 
2.30.2