From: Iuliana Prodan <iuliana.prodan@nxp.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Baolin Wang <baolin.wang@linaro.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Corentin Labbe <clabbe.montjoie@gmail.com>,
Horia Geanta <horia.geanta@nxp.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Maxime Ripard <mripard@kernel.org>,
Aymen Sghaier <aymen.sghaier@nxp.com>,
"David S. Miller" <davem@davemloft.net>,
Silvano Di Ninno <silvano.dininno@nxp.com>,
Franck Lenormand <franck.lenormand@nxp.com>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH v5 2/3] crypto: engine - support for parallel requests based on retry mechanism
Date: Fri, 24 Apr 2020 14:34:57 +0000 [thread overview]
Message-ID: <VI1PR0402MB3712298355411E273294E5F38CD00@VI1PR0402MB3712.eurprd04.prod.outlook.com> (raw)
In-Reply-To: 20200423114640.GA14399@gondor.apana.org.au
On 4/23/2020 2:47 PM, Herbert Xu wrote:
> On Wed, Apr 15, 2020 at 11:26:14PM +0300, Iuliana Prodan wrote:
>> Added support for executing multiple requests, in parallel,
>> for crypto engine based on a retry mechanism.
>> If hardware was unable to execute a backlog request, enqueue it
>> back in front of crypto-engine queue, to keep the order
>> of requests.
>>
>> A new variable is added, retry_support (this is to keep the
>> backward compatibility of crypto-engine) , which keeps track
>> whether the hardware has support for retry mechanism and,
>> also, if can run multiple requests.
>>
>> If do_one_request() returns:
>>> = 0: hardware executed the request successfully;
>> < 0: this is the old error path. If hardware has support for retry
>> mechanism, the request is put back in front of crypto-engine queue.
>> For backwards compatibility, if the retry support is not available,
>> the crypto-engine will work as before.
>> Only MAY_BACKLOG requests are enqueued back into
>> crypto-engine's queue, since the others can be dropped.
>
> This looks a lot nicer!
>
> However, I do have one little issue with the error case. I think
> we should not lump all errors together. For queueing errors, we
> should requeue regardless of MAY_BACKLOG. After all, we don't
> want to have random packet loss just becayse the queue was full.
>
> For other errors (e.g., a kmalloc error), we should requeue the
> MAY_BACKLOG requests and drop everythin else.
>
Do you refer to the error codes returned by do_one_request (which sends
the req to hw for execution)?
If this returns:
1. 0, success;
2. -ENOSPC, I'll requeue it regardless of MAY_BACKLOG;
3. any other error (-EIO, -EINVAL, -ENOMEM, etc), I'll requeue only
MAY_BACKLOG requests.
Thanks,
Iulia
next prev parent reply other threads:[~2020-04-24 14:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-15 20:26 [PATCH v5 0/3] crypto: engine - support for parallel and batch requests Iuliana Prodan
2020-04-15 20:26 ` [PATCH v5 1/3] crypto: algapi - create function to add request in front of queue Iuliana Prodan
2020-04-15 20:26 ` [PATCH v5 2/3] crypto: engine - support for parallel requests based on retry mechanism Iuliana Prodan
2020-04-23 11:46 ` Herbert Xu
2020-04-24 14:34 ` Iuliana Prodan [this message]
2020-04-24 15:10 ` Herbert Xu
2020-04-15 20:26 ` [PATCH v5 3/3] crypto: engine - support for batch requests Iuliana Prodan
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