linux-kernel - Re: [PATCH 00/18] xfrm: Add compat layer

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Date:   Fri, 27 Jul 2018 16:19:36 +0200
From:   Florian Westphal <fw@...len.de>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        Florian Westphal <fw@...len.de>, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Dmitry Safonov <0x7f454c46@...il.com>, netdev@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        John Stultz <john.stultz@...aro.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-efi@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        Eric Paris <eparis@...hat.com>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Paul Moore <paul@...l-moore.com>, coreteam@...filter.org,
        linux-audit@...hat.com, netfilter-devel@...r.kernel.org,
        Fan Du <fan.du@...el.com>
Subject: Re: [PATCH 00/18] xfrm: Add compat layer

Dmitry Safonov <dima@...sta.com> wrote:
> 1. It will double copy netlink messages, making it O(n) instead of
> O(1), where n - is number of bind()s.. Probably we don't care much.

About those bind() patches, I don't understand why they are needed.

Why can't you just add the compat skb to the native skb when doing
the multicast call?

skb_shinfo(skb)->frag_list = compat_skb;
xfrm_nlmsg_multicast(net, skb, 0, ...