[dpdk-dev] [PATCH v2] librte_ether: release memory in uninit function.

[Qiu, Michael]

On 2015/6/29 18:20, Iremonger, Bernard wrote:
>
>> -----Original Message-----
>> From: Qiu, Michael
>> Sent: Monday, June 29, 2015 9:55 AM
>> To: Iremonger, Bernard; dev at dpdk.org
>> Cc: Zhang, Helin; Ananyev, Konstantin; mukawa at igel.co.jp; Stephen
>> Hemminger
>> Subject: Re: [PATCH v2] librte_ether: release memory in uninit function.
>>
>> On 6/26/2015 5:32 PM, Iremonger, Bernard wrote:
>>> Changes in v2:
>>> do not free mac_addrs and hash_mac_addrs here.
>>>
>>> Signed-off-by: Bernard Iremonger <bernard.iremonger at intel.com>
>>> ---
>>>  lib/librte_ether/rte_ethdev.c |    6 +++++-
>>>  1 files changed, 5 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/lib/librte_ether/rte_ethdev.c
>>> b/lib/librte_ether/rte_ethdev.c index e13fde5..7ae101a 100644
>>> --- a/lib/librte_ether/rte_ethdev.c
>>> +++ b/lib/librte_ether/rte_ethdev.c
>>> @@ -369,8 +369,12 @@ rte_eth_dev_uninit(struct rte_pci_device
>> *pci_dev)
>>>  	/* free ether device */
>>>  	rte_eth_dev_release_port(eth_dev);
>>>
>>> -	if (rte_eal_process_type() == RTE_PROC_PRIMARY)
>>> +	if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
>>> +		rte_free(eth_dev->data->rx_queues);
>>> +		rte_free(eth_dev->data->tx_queues);
>>>  		rte_free(eth_dev->data->dev_private);
>>> +		memset(eth_dev->data, 0, sizeof(struct
>> rte_eth_dev_data));
>>> +	}
>>>
>>>  	eth_dev->pci_dev = NULL;
>>>  	eth_dev->driver = NULL;
>>
>> Actually, This could be put in rte_eth_dev_close() becasue queues should be
>> released when closed.
>>
>> Also before free dev->data->rx_queues you should make sure
>> dev->data->rx_queues[i] has been freed in PMD close() function, So this
>> two should be better done at the same time, ether in
>> rte_eth_dev_close() or in PMD close() function. For hotplug in fm10k, I put it
>> in PMD close() function.
>>
>> Thanks,
>> Michael
> Hi Michael,
>  
> The consensus is that the rx_queue and tx_queue memory should not be released in the PMD as it is not allocated by the PMD. The memory is allocated in rte_eth_dev_rx_queue_config() and rte_eth_dev_tx_queue_config(), which are both called from rte_eth_dev_configure() which is called by the application (for example test_pmd). So it seems to make sense to free this memory  in rte_eth_dev_uninit().

It really make sense to free memory in rte_ether level, but when close a
port with out detached? just as stop --> close() --> quit(), the memory
will not be released :)

Thanks,
Michael
 
>
> Regards,
>
> Bernard.
>
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