From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Pascal Mazon <pascal.mazon@6wind.com>, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] net/tap: driver closing tx interface on queue setup
Date: Mon, 30 Jan 2017 17:19:20 +0000 [thread overview]
Message-ID: <01e6d298-0356-aefd-5e54-4fd73748f890@intel.com> (raw)
In-Reply-To: <dfe52108-6bb8-73ba-f65d-0aa066882e48@6wind.com>
On 1/30/2017 2:38 PM, Pascal Mazon wrote:
> On 01/30/2017 12:00 PM, Ferruh Yigit wrote:> On 1/29/2017 2:12 AM, Keith
> Wiles wrote:
>>> The tap driver setup both rx and tx file descriptors when the
>>> rte_eth_rx_queue_setup() causing the tx to be closed when tx setup
>>> was called.
>>
>> Can you please describe the problem more.
>> Without this patch rx->fd == tx->fd, with this patch rx and tx has
>> different file descriptors.
>>
>> What was the wrong with rx and tx having same fd?
>>
>> As far as I can see, rte_eth_rx_queue_setup() won't close tx->fd, that
>> function will do nothing if rx or tx has valid fd.
>>
>>>
>>> Signed-off-by: Keith Wiles <keith.wiles@intel.com>
>>
>> <...>
>>
>
> Hi,
>
> The tap PMD recently broke for me because of this patch [1].
>
> During init (eth_dev_tap_create()), the tap PMD allocates a shared RX/TX
> queue through tun_alloc().
> The recent patch now releases existing queues in rx_queue_setup(),
> before adding new ones.
>
> When rx_queue_setup() is called, it uses close() calls on all shared
> queues, effectively deleting the netdevice.
> That's the main issue here.
>
> I tested Keith's patch [2], and it fixes that issue, using separate queues.
Thanks for the clarification, and I am adding following patch to patch [2]:
Tested-by: Pascal Mazon <pascal.mazon@6wind.com>
<...>
>
> [1] d00d7cc88335 ("ethdev: release queue before setting up")
> [2] http://dpdk.org/ml/archives/dev/2017-January/056470.html
>
>
next prev parent reply other threads:[~2017-01-30 17:19 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-29 2:12 Keith Wiles
2017-01-30 11:00 ` Ferruh Yigit
2017-01-30 14:34 ` Wiles, Keith
2017-01-30 17:42 ` Ferruh Yigit
2017-01-30 18:20 ` Wiles, Keith
2017-01-30 19:31 ` Ferruh Yigit
2017-01-30 14:38 ` Pascal Mazon
2017-01-30 15:04 ` Wiles, Keith
2017-01-30 17:19 ` Ferruh Yigit [this message]
2017-01-30 20:54 ` [dpdk-dev] [PATCH v2] net/tap: fix invalid queue file descriptor Ferruh Yigit
2017-01-30 20:57 ` Wiles, Keith
2017-01-30 21:23 ` Ferruh Yigit
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