The virtio device mac is empty in vhostuser type.

The virtio device mac is empty in vhostuser type.

[? ?]

Hi,

When I attached a virtio device to ovs bridge in vhostuser type, the virtual port does not have the mac address.
After checked the dpdk code, I found the 'mac' which is the member of struct 'virtio_net' is empty.
It only been assigned in case VHOST_USER_SEND_RARP of function 'vhost_user_msg_handler'.
But the comments said VHOST_USER_SEND_RARP would be handled during VM migration.

Therefore I would like to ask when I launch the dpdk vhost-user program, how could I get the virtio NIC MAC address?

Thanks
________________________________
Best Regards,
Hering
heringlinux@outlook.com

Re: The virtio device mac is empty in vhostuser type.

[Tan, Jianfeng]

Hi,

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of ? ?
> Sent: Thursday, November 9, 2017 11:24 AM
> To: dev
> Cc: yuanhan.liu; Xie, Huawei
> Subject: [dpdk-dev] The virtio device mac is empty in vhostuser type.
> 
> Hi,
> 
> When I attached a virtio device to ovs bridge in vhostuser type, the virtual
> port does not have the mac address.
> After checked the dpdk code, I found the 'mac' which is the member of
> struct 'virtio_net' is empty.
> It only been assigned in case VHOST_USER_SEND_RARP of function
> 'vhost_user_msg_handler'.
> But the comments said VHOST_USER_SEND_RARP would be handled during
> VM migration.

We can treat virtio and vhost as a back-to-back connected cable: virtio and vhost (pmd) have their own mac.

> 
> Therefore I would like to ask when I launch the dpdk vhost-user program,
> how could I get the virtio NIC MAC address?

Usually, we do ARP learn on this vhost port to get the mac address of virtio.

Thanks,
Jianfeng


> 
> Thanks
> ________________________________
> Best Regards,
> Hering
> heringlinux@outlook.com