[dpdk-users] Set mtu value

[dpdk-users] Set mtu value

[Victor Detoni]

Hello,

I'm trying to use rte_eth_dev_set_mtu function to change mtu value. When I
use the code below the function returns -ENOTSUP. Someone knows what's
happening? I can change mtu value with "ifconfig".

uint16_t mtu;
ret = rte_eth_dev_set_mtu(ported,mtu);

if (ret == 0)
  printf("Port %d: MTU set to %d\n",portid, ,mtu);
else if (ret == -ENOTSUP)
  printf("Port %d: Operation not supported\n",portid);
else
  printf("Port %d: Error setting MTU\n",portid);

Re: [dpdk-users] Set mtu value

[Stephen Hemminger]

only some device drivers support changing MTU via the change API.
For the rest the application has to stop the device, configure new
settings, and start.

Re: [dpdk-users] Set mtu value

[Victor Detoni]

Stephen, thank you for your answer.

When you say "stop the device, configure new settings, and start", you mean
use these functions rte_eth_dev_stop and rte_eth_dev_start?

On Mon, Aug 22, 2016 at 2:27 AM, Stephen Hemminger <
stephen@networkplumber.org> wrote:

> only some device drivers support changing MTU via the change API.
> For the rest the application has to stop the device, configure new
> settings, and start.
>

Re: [dpdk-users] Set mtu value

[Victor Detoni]

Even using `ifconfig eth0 mtu 1000` it doesn't work. My dpdk api shows 1500
mtu value.

And when I try to use l3fwd api and settings --enable-jumbo --max-pkt-len
9000 for example, it doesn't work. it appears: Cause
rte_eth_tx_queue_setup: err-22, port=0

Any tips? I'm using Ubuntu 16.04 and VMXNET3.

thanks

On Mon, Aug 22, 2016 at 10:12 AM, Victor Detoni <victordetoni@gmail.com>
wrote:

> Stephen, thank you for your answer.
>
> When you say "stop the device, configure new settings, and start", you
> mean use these functions rte_eth_dev_stop and rte_eth_dev_start?
>
> On Mon, Aug 22, 2016 at 2:27 AM, Stephen Hemminger <
> stephen@networkplumber.org> wrote:
>
>> only some device drivers support changing MTU via the change API.
>> For the rest the application has to stop the device, configure new
>> settings, and start.
>>
>
>