linux-kernel - Re: [PATCH v3 3/4] crypto/net/ipv6: sr: Switch to using crypto

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Message-ID: <2c0de89e-0842-21af-cedf-2aa9184c6d1a@arista.com>
Date:   Wed, 18 Jan 2023 16:37:16 +0000
From:   Dmitry Safonov <dima@...sta.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "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 v3 3/4] crypto/net/ipv6: sr: Switch to using crypto_pool

On 1/18/23 03:48, Jakub Kicinski wrote:
> On Mon, 16 Jan 2023 20:14:57 +0000 Dmitry Safonov wrote:
>> The conversion to use crypto_pool has the following upsides:
>> - now SR uses asynchronous API which may potentially free CPU cycles and
>>   improve performance for of CPU crypto algorithm providers;
>> - hash descriptors now don't have to be allocated on boot, but only at
>>   the moment SR starts using HMAC and until the last HMAC secret is
>>   deleted;
>> - potentially reuse ahash_request(s) for different users
>> - allocate only one per-CPU scratch buffer rather than a new one for
>>   each user
>> - have a common API for net/ users that need ahash on RX/TX fast path
> 
> breaks allmodconfig build:
> 
> ERROR: modpost: "seg6_hmac_init" [net/ipv6/ipv6.ko] undefined!
> make[2]: *** [../scripts/Makefile.modpost:138: Module.symvers] Error 1
> make[1]: *** [/home/nipa/net-next/Makefile:1960: modpost] Error 2
> make: *** [Makefile:242: __sub-make] Error 2

Thanks!
Yeah, I thought I barely touched seg6 in v3 and it seems I didn't even
build it in current .config assuming not much changed. Oops!

Will send a better version 4 today,
          Dmitry