netdev - Re: [PATCH v4 01/21] net/tcp: Prepare tcp_md5sig

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Date:   Mon, 20 Feb 2023 17:41:50 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andy Lutomirski <luto@...capital.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Bob Gilligan <gilligan@...sta.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        David Laight <David.Laight@...lab.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ivan Delalande <colona@...sta.com>,
        Leonard Crestez <cdleonard@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH v4 01/21] net/tcp: Prepare tcp_md5sig_pool for TCP-AO

On Wed, Feb 15, 2023 at 06:33:15PM +0000, Dmitry Safonov wrote:
> TCP-AO similarly to TCP-MD5 needs to allocate tfms on a slow-path, which
> is setsockopt() and use crypto ahash requests on fast paths, which are
> RX/TX softirqs. It as well needs a temporary/scratch buffer for
> preparing the hashing request.
> 
> Extend tcp_md5sig_pool to support other hashing algorithms than MD5.
> Move it in a separate file.
> 
> This patch was previously submitted as more generic crypto_pool [1],
> but Herbert nacked making it generic crypto API. His view is that crypto
> requests should be atomically allocated on fast-paths. So, in this
> version I don't move this pool anywhere outside TCP, only extending it
> for TCP-AO use-case. It can be converted once there will be per-request
> hashing crypto keys.
> 
> [1]: https://lore.kernel.org/all/20230118214111.394416-1-dima@arista.com/T/#u
> Signed-off-by: Dmitry Safonov <dima@...sta.com>
> ---
>  include/net/tcp.h        |  48 ++++--
>  net/ipv4/Kconfig         |   4 +
>  net/ipv4/Makefile        |   1 +
>  net/ipv4/tcp.c           | 103 +++---------
>  net/ipv4/tcp_ipv4.c      |  97 +++++++-----
>  net/ipv4/tcp_minisocks.c |  21 ++-
>  net/ipv4/tcp_sigpool.c   | 333 +++++++++++++++++++++++++++++++++++++++
>  net/ipv6/tcp_ipv6.c      |  58 +++----
>  8 files changed, 493 insertions(+), 172 deletions(-)
>  create mode 100644 net/ipv4/tcp_sigpool.c

Please wait for my per-request hash work before you resubmit this.
Once that's in place all you need is a single tfm for the whole
system.

As to request pools what exactly is the point of that? Just kmalloc
them on demand.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt