netdev - Re: [PATCH net 4/7] net: tls: handle backlogging of crypto requests

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Message-ID: <20240209092505.GQ1435458@kernel.org>
Date: Fri, 9 Feb 2024 09:25:05 +0000
From: Simon Horman <horms@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
	pabeni@...hat.com, sd@...asysnail.net, vadim.fedorenko@...ux.dev,
	borisp@...dia.com, john.fastabend@...il.com, vakul.garg@....com,
	davejwatson@...com
Subject: Re: [PATCH net 4/7] net: tls: handle backlogging of crypto requests

On Tue, Feb 06, 2024 at 05:18:21PM -0800, Jakub Kicinski wrote:
> Since we're setting the CRYPTO_TFM_REQ_MAY_BACKLOG flag on our
> requests to the crypto API, crypto_aead_{encrypt,decrypt} can return
>  -EBUSY instead of -EINPROGRESS in valid situations. For example, when
> the cryptd queue for AESNI is full (easy to trigger with an
> artificially low cryptd.cryptd_max_cpu_qlen), requests will be enqueued
> to the backlog but still processed. In that case, the async callback
> will also be called twice: first with err == -EINPROGRESS, which it
> seems we can just ignore, then with err == 0.
> 
> Compared to Sabrina's original patch this version uses the new
> tls_*crypt_async_wait() helpers and converts the EBUSY to
> EINPROGRESS to avoid having to modify all the error handling
> paths. The handling is identical.
> 
> Fixes: a54667f6728c ("tls: Add support for encryption using async offload accelerator")
> Fixes: 94524d8fc965 ("net/tls: Add support for async decryption of tls records")
> Co-developed-by: Sabrina Dubroca <sd@...asysnail.net>
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
> Link: https://lore.kernel.org/netdev/9681d1febfec295449a62300938ed2ae66983f28.1694018970.git.sd@queasysnail.net/
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Reviewed-by: Simon Horman <horms@...nel.org>