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From: "Meunier, Julien (Nokia - FR/Paris-Saclay)" <julien.meunier@nokia.com>
To: Akhil Goyal <akhil.goyal@nxp.com>,
	Pablo de Lara <pablo.de.lara.guarch@intel.com>,
	Declan Doherty <declan.doherty@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] cryptodev: fix invalid dev_id after a pmd close
Date: Tue, 15 Oct 2019 14:39:37 +0000	[thread overview]
Message-ID: <8eded01d-bf6d-8a3c-e8cf-d722adfebffa@nokia.com> (raw)
In-Reply-To: <VE1PR04MB66391CF60B6B43C13E5C3A01E6930@VE1PR04MB6639.eurprd04.prod.outlook.com>

Hi

On 15/10/2019 15:44, Akhil Goyal wrote:
> 
>>
>> Hi Julien
>>
>>>
>>> Each cryptodev are indexed with its dev_id in the global
>>> rte_crypto_devices variable. nb_devs is incremented / decremented each
>>> time a cryptodev is created / deleted. The goal of nb_devs is to prevent
>>> the user to get an invalid dev_id.
>>>
>>> Let's imagine DPDK has configured N cryptodevs. If the cryptodev=1 is
>>> removed at runtime, the latest cryptodev N cannot be accessible, because
>>> nb_devs=N-1.
>>>
>>> In order to prevent this kind of behavior, let's remove the check with
>>> nb_devs and iterate in all the rte_crypto_devices elements: if data is
>>> not NULL, that means a valid cryptodev is available.
>>>
>>> Fixes: d11b0f30df88 ("cryptodev: introduce API and framework for crypto
>>> devices")
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Julien Meunier <julien.meunier@nokia.com>
>>> ---
> // snip//
> 
>>> @@ -560,7 +570,13 @@ rte_cryptodev_get_dev_id(const char *name)
>>>   uint8_t
>>>   rte_cryptodev_count(void)
>>>   {
>>> -	return cryptodev_globals.nb_devs;
>>> +	uint8_t i, dev_count = 0;
>>> +
>>> +	for (i = 0; i < RTE_CRYPTO_MAX_DEVS; i++)
>>> +		if (cryptodev_globals.devs[i].data != NULL)
>>> +			dev_count++;
>>> +
>>> +	return dev_count;
>>>   }
>>
>> Why do you want to remove the nb_devs? We can have it updated
>> (incremented/decremented)
>> While allocate/release of the device.
>> The point is, whenever somebody call rte_cryptodev_count() it will do a lookup
>> of valid data
>> pointer.
> 
> Could you please do the requested change. This patch need to be integrated by this week.
> 
> Thanks.
> 
Sorry, I was busy on other tasks. I will propose a new patch today by 
keeping the nb_devs field.

Regards.

-- 
Julien Meunier

  reply	other threads:[~2019-10-15 14:39 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-07  8:39 Julien Meunier
2019-10-03 12:49 ` Akhil Goyal
2019-10-15 13:44   ` Akhil Goyal
2019-10-15 14:39     ` Meunier, Julien (Nokia - FR/Paris-Saclay) [this message]
2019-10-15 16:50 ` [dpdk-dev] [PATCH v2] cryptodev: fix check related to device id Julien Meunier
2019-10-16  7:02   ` Akhil Goyal
2019-10-16  7:16     ` Meunier, Julien (Nokia - FR/Paris-Saclay)
2019-10-16 10:21 ` [dpdk-dev] [PATCH v3] " Julien Meunier
2019-10-16 12:49   ` Akhil Goyal

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