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[89.24.32.122]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-381c10b7b80sm8686121f8f.10.2024.11.02.10.21.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 02 Nov 2024 10:21:50 -0700 (PDT) Message-ID: <8784622f-ccdc-4086-83f7-50462d6369df@gmail.com> Date: Sat, 2 Nov 2024 18:21:48 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH v2 04/18] crypto: crc32 - don't unnecessarily register arch algorithms To: Eric Biggers , Herbert Xu Cc: Ard Biesheuvel , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org References: <20241026040958.GA34351@sol.localdomain> <20241102163605.GA28213@sol.localdomain> Content-Language: en-US From: Milan Broz Autocrypt: addr=gmazyland@gmail.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241102_102154_265908_006460F9 X-CRM114-Status: GOOD ( 15.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 11/2/24 5:36 PM, Eric Biggers wrote: > On Sat, Nov 02, 2024 at 07:08:43PM +0800, Herbert Xu wrote: >> On Sat, Nov 02, 2024 at 12:05:01PM +0100, Ard Biesheuvel wrote: >>> >>> The only issue resulting from *not* taking this patch is that btrfs >>> may misidentify the CRC32 implementation as being 'slow' and take an >>> alternative code path, which does not necessarily result in worse >>> performance. >> >> If we were removing crc32* (or at least crc32*-arch) from the Crypto >> API then these patches would be redundant. But if we're keeping them >> because btrfs uses them then we should definitely make crc32*-arch >> do the right thing. IOW they should not be registered if they're >> the same as crc32*-generic. >> >> Thanks, > > I would like to eventually remove crc32 and crc32c from the crypto API, but it > will take some time to get all the users converted. If there are AF_ALG users > it could even be impossible, though the usual culprit, iwd, doesn't appear to > use any CRCs, so hopefully we are fine there. Hi, Please do not forget about dm-integrity, it can use crc32/crc32c for non-cryptographic integrity through crypto API. To test it, cryptsetup testsuite should cover these variants (integrity-compat-test). Also, libcryptsetup can be compiled with userspace kernel crypto (AF_ALG) as a crypto backend. At least, I think we never used CRC32 though AF_ALG from userspace there... Thanks, Milan