linux-kernel - [PATCH 0/3] rework netlink skb allocation

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Message-ID: <1566470851-4694-1-git-send-email-jan.dakinevich@virtuozzo.com>
Date:   Thu, 22 Aug 2019 10:48:08 +0000
From:   Jan Dakinevich <jan.dakinevich@...tuozzo.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Denis Lunev <den@...tuozzo.com>,
        Konstantin Khorenko <khorenko@...tuozzo.com>,
        "jan.dakinevich@...il.com" <jan.dakinevich@...il.com>,
        Jan Dakinevich <jan.dakinevich@...tuozzo.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Alexey Kuznetsov (C)" <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Johannes Berg <johannes.berg@...el.com>,
        David Ahern <dsahern@...il.com>,
        Christian Brauner <christian@...uner.io>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Simon Horman <simon.horman@...ronome.com>,
        John Hurley <john.hurley@...ronome.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Li RongQing <lirongqing@...du.com>,
        Taehee Yoo <ap420073@...il.com>,
        Patrick Talbert <ptalbert@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Safonov <dima@...sta.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
        "coreteam@...filter.org" <coreteam@...filter.org>
Subject: [PATCH 0/3] rework netlink skb allocation

Currently, userspace is able to initiate costly high-order allocation in 
kernel sending large broadcast netlink message, which is considered 
undesirable. At the same time, unicast message are safe in this regard, 
because they uses vmalloc-ed memory.

This series introduces changes, that allow broadcast messages to be 
allocated with vmalloc() as well as unicast.

Jan Dakinevich (3):
  skbuff: use kvfree() to deallocate head
  netlink: always use vmapped memory for skb data
  netlink: use generic skb_set_owner_r()

 include/linux/netlink.h   | 16 ----------------
 net/core/skbuff.c         |  2 +-
 net/ipv4/fib_frontend.c   |  2 +-
 net/netfilter/nfnetlink.c |  2 +-
 net/netlink/af_netlink.c  | 39 +++++++--------------------------------
 5 files changed, 10 insertions(+), 51 deletions(-)

-- 
2.1.4