[dpdk-dev] [PATCH v4 28/41] net/dpaa: add support for link status update

[Shreyansh Jain]

On Monday 18 September 2017 08:26 PM, Ferruh Yigit wrote:
> On 9/9/2017 12:21 PM, Shreyansh Jain wrote:
>> Signed-off-by: Hemant Agrawal <hemant.agrawal at nxp.com>
>> Signed-off-by: Shreyansh Jain <shreyansh.jain at nxp.com>
> 
> <...>
> 
>> +static int dpaa_eth_link_update(struct rte_eth_dev *dev,
>> +				int wait_to_complete __rte_unused)
>> +{
>> +	struct dpaa_if *dpaa_intf = dev->data->dev_private;
>> +	struct rte_eth_link *link = &dev->data->dev_link;
>> +
>> +	PMD_INIT_FUNC_TRACE();
>> +
>> +	if (dpaa_intf->fif->mac_type == fman_mac_1g)
>> +		link->link_speed = 1000;
>> +	else if (dpaa_intf->fif->mac_type == fman_mac_10g)
>> +		link->link_speed = 10000;
>> +	else
>> +		DPAA_PMD_ERR("invalid link_speed: %s, %d",
>> +			     dpaa_intf->name, dpaa_intf->fif->mac_type);
>> +
>> +	link->link_status = dpaa_intf->valid;
>> +	link->link_duplex = ETH_LINK_FULL_DUPLEX;
>> +	link->link_autoneg = ETH_LINK_AUTONEG;
> 
> Shouldn't this function go and get link information from hardware?

Our currently hardware interfaces don't support these operations 
explicitly. For the "fman_mac_1g" and "fman_mac_10g", these are the 
default sets which are exposing.
Overtime, we will get more such interfaces exposed from Linux kernel to 
Fman library and update this code.

> 
>> +	return 0;
>> +}
>> +
>>   static
>>   int dpaa_eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
>>   			    uint16_t nb_desc __rte_unused,
>> @@ -216,6 +238,22 @@ static void dpaa_eth_tx_queue_release(void *txq __rte_unused)
>>   	PMD_INIT_FUNC_TRACE();
>>   }
>>   
>> +static int dpaa_link_down(struct rte_eth_dev *dev)
>> +{
>> +	PMD_INIT_FUNC_TRACE();
>> +
>> +	dpaa_eth_dev_stop(dev);
> 
> Drivers tend to do revers, make link down on device stop. Just to double
> check if stop() is intended for link down.

fman_if_disable_rx is equivalent to "link down" as well as stop (because 
it flushes the queues). That is why these APIs are linked.

> 
>> +	return 0;
>> +}
>> +
>> +static int dpaa_link_up(struct rte_eth_dev *dev)
>> +{
>> +	PMD_INIT_FUNC_TRACE();
>> +
>> +	dpaa_eth_dev_start(dev);
>> +	return 0;
>> +}
> 
> <...>
>