[dpdk-dev] how to get driver name for a given port ID

[dpdk-dev] how to get driver name for a given port ID

[Montorsi, Francesco]

Hi all,

Is there an API to retrieve the driver name for a certain port ID before calling rte_eth_dev_configure()?

My use case is: I'm trying to call rte_eth_dev_configure() with nb_rx_q=4 and found that this works for ixgbe driver but it doesn't for "rte_em_pmd" (1Gbps device):

ERROR HwEmulDPDKPort::init() rte_eth_dev_configure: err=-22, port=0: Unknown error -22
EAL: PCI device 0000:03:00.0 on NUMA socket 0
EAL:   remove driver: 8086:105e rte_em_pmd
EAL:   PCI memory unmapped at 0x7feb40000000
EAL:   PCI memory unmapped at 0x7feb40020000

So, for those devices I want to use nb_rx_q=1...

Thanks,

Francesco Montorsi

Re: [dpdk-dev] how to get driver name for a given port ID

[Montorsi, Francesco]

Hi, 
Just as reference for other DPDK users: the solution to the problem is simple:

rte_eth_dev_info_get (uint8_t port_id, struct rte_eth_dev_info *dev_info)

returns a dev_info structure that contains "driver_name"...

HTH,
Francesco



> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Montorsi,
> Francesco
> Sent: lunedì 26 ottobre 2015 15:18
> To: dev@dpdk.org
> Subject: [dpdk-dev] how to get driver name for a given port ID
> 
> Hi all,
> 
> Is there an API to retrieve the driver name for a certain port ID before calling
> rte_eth_dev_configure()?
> 
> My use case is: I'm trying to call rte_eth_dev_configure() with nb_rx_q=4
> and found that this works for ixgbe driver but it doesn't for "rte_em_pmd"
> (1Gbps device):
> 
> ERROR HwEmulDPDKPort::init() rte_eth_dev_configure: err=-22, port=0:
> Unknown error -22
> EAL: PCI device 0000:03:00.0 on NUMA socket 0
> EAL:   remove driver: 8086:105e rte_em_pmd
> EAL:   PCI memory unmapped at 0x7feb40000000
> EAL:   PCI memory unmapped at 0x7feb40020000
> 
> So, for those devices I want to use nb_rx_q=1...
> 
> Thanks,
> 
> Francesco Montorsi

Re: [dpdk-dev] how to get driver name for a given port ID

[Andriy Berestovskyy]

Hi Francesco,
You're on the right track. Please note that struct rte_eth_dev_info
also has max_rx_queues field - maximum number of RX queues the NIC
supports.

Regards,
Andriy

On Tue, Oct 27, 2015 at 10:59 AM, Montorsi, Francesco
<fmontorsi@empirix.com> wrote:
> Hi,
> Just as reference for other DPDK users: the solution to the problem is simple:
>
> rte_eth_dev_info_get (uint8_t port_id, struct rte_eth_dev_info *dev_info)
>
> returns a dev_info structure that contains "driver_name"...
>
> HTH,
> Francesco
>
>
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Montorsi,
>> Francesco
>> Sent: lunedì 26 ottobre 2015 15:18
>> To: dev@dpdk.org
>> Subject: [dpdk-dev] how to get driver name for a given port ID
>>
>> Hi all,
>>
>> Is there an API to retrieve the driver name for a certain port ID before calling
>> rte_eth_dev_configure()?
>>
>> My use case is: I'm trying to call rte_eth_dev_configure() with nb_rx_q=4
>> and found that this works for ixgbe driver but it doesn't for "rte_em_pmd"
>> (1Gbps device):
>>
>> ERROR HwEmulDPDKPort::init() rte_eth_dev_configure: err=-22, port=0:
>> Unknown error -22
>> EAL: PCI device 0000:03:00.0 on NUMA socket 0
>> EAL:   remove driver: 8086:105e rte_em_pmd
>> EAL:   PCI memory unmapped at 0x7feb40000000
>> EAL:   PCI memory unmapped at 0x7feb40020000
>>
>> So, for those devices I want to use nb_rx_q=1...
>>
>> Thanks,
>>
>> Francesco Montorsi
>



-- 
Andriy Berestovskyy