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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>,
	David Marchand <david.marchand@redhat.com>
Cc: Matan Azrad <matan@mellanox.com>,
	Shahaf Shuler <shahafs@mellanox.com>,
	Viacheslav Ovsiienko <viacheslavo@mellanox.com>,
	Jasvinder Singh <jasvinder.singh@intel.com>,
	Cristian Dumitrescu <cristian.dumitrescu@intel.com>,
	Andrew Rybchenko <arybchenko@solarflare.com>, dev <dev@dpdk.org>,
	dpdk stable <stable@dpdk.org>,
	Raslan Darawsheh <rasland@mellanox.com>
Subject: Re: [dpdk-dev] [PATCH] ethdev: limit maximum number of queues
Date: Wed, 27 Nov 2019 14:14:22 +0000
Message-ID: <7bbfaed7-665c-63ec-97e6-a805a7b320bb@intel.com> (raw)
In-Reply-To: <7429394.Qh3vguxsr8@xps>

On 11/27/2019 2:11 PM, Thomas Monjalon wrote:
> 27/11/2019 15:07, David Marchand:
>> On Wed, Nov 27, 2019 at 3:06 PM Ferruh Yigit <ferruh.yigit@intel.com> wrote:
>>>
>>> On 11/27/2019 1:42 PM, Thomas Monjalon wrote:
>>>> A buffer overflow happens in testpmd with some drivers
>>>> since the queue arrays are limited to RTE_MAX_QUEUES_PER_PORT.
>>>>
>>>> The advertised capabilities of mlx4, mlx5 and softnic
>>>> for the number of queues were the maximum number: UINT16_MAX.
>>>> They must be limited by the configured RTE_MAX_QUEUES_PER_PORT
>>>> that applications expect to be respected.
>>>>
>>>> The limitation is applied in above drivers having no limitation,
>>>> and at ethdev level (function rte_eth_dev_info_get), in order
>>>> to force the configured limit for all drivers.
>>>
>>> The limit is not device limit, should we reflect it into PMDs?
>>> Why not keep the limit only in the ethdev?
>>
>> +1.
> 
> Yes ethdev is enough.
> I thought it would be better to document the limit in the PMDs as well,
> instead of keeping gigantic max.
> 
> I can change if you feel strong about it.
> 

No strong opinion, but not sure if we should document ethdev limitation in
ethdev, for me only ethdev limit looks good.

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 13:42 Thomas Monjalon
2019-11-27 14:05 ` Ferruh Yigit
2019-11-27 14:07   ` David Marchand
2019-11-27 14:11     ` Thomas Monjalon
2019-11-27 14:14       ` Ferruh Yigit [this message]
2019-11-27 14:15         ` Ferruh Yigit
2019-11-27 14:30       ` David Marchand
2019-11-27 14:31 ` [dpdk-dev] [PATCH v2] " Thomas Monjalon
2019-11-27 14:47   ` David Marchand
2019-11-27 15:09     ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon

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