netdev - Re: [PATCH v4 1/4] crypto: Introduce crypto

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Date:   Thu, 19 Jan 2023 17:51:13 +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>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andy Lutomirski <luto@...capital.net>,
        Bob Gilligan <gilligan@...sta.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Leonard Crestez <cdleonard@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Salam Noureddine <noureddine@...sta.com>,
        netdev@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH v4 1/4] crypto: Introduce crypto_pool

On Wed, Jan 18, 2023 at 09:41:08PM +0000, Dmitry Safonov wrote:
> Introduce a per-CPU pool of async crypto requests that can be used
> in bh-disabled contexts (designed with net RX/TX softirqs as users in
> mind). Allocation can sleep and is a slow-path.
> Initial implementation has only ahash as a backend and a fix-sized array
> of possible algorithms used in parallel.
> 
> Signed-off-by: Dmitry Safonov <dima@...sta.com>
> ---
>  crypto/Kconfig        |   3 +
>  crypto/Makefile       |   1 +
>  crypto/crypto_pool.c  | 333 ++++++++++++++++++++++++++++++++++++++++++
>  include/crypto/pool.h |  46 ++++++
>  4 files changed, 383 insertions(+)
>  create mode 100644 crypto/crypto_pool.c
>  create mode 100644 include/crypto/pool.h

I'm still nacking this.

I'm currently working on per-request keys which should render
this unnecessary.  With per-request keys you can simply do an
atomic kmalloc when you compute the hash.

Modelling tcp_md5 is just propagating bad code.

Thanks,
-- 
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