[dpdk-users] ring vdev and secondary process

[dpdk-users] ring vdev and secondary process

[Tom Barbette]

Hi all,


I'm trying to use virtual devices (ring-based PMD, but the underlying system does not matter) between two DPDK processes.


But when I launch the secondary process, I get "RING: Cannot reserve memory". I modified the message to get the rte_errno, which is 17, File exists.  This also happens with testpmd.


I'm using DPDK 18.08. Using the ring API directly works without any problem. But I'd like to use the vdev one to build functional tests.


I tried with the TAP pmd, the device is not available in the secondary process (rte_eth_dev_count_avail() is 0).


Thanks,

Tom

Re: [dpdk-users] ring vdev and secondary process

[Wiles, Keith]

> On Sep 3, 2018, at 3:40 PM, Tom Barbette <barbette@kth.se> wrote:
> 
> Hi all,
> 
> 
> I'm trying to use virtual devices (ring-based PMD, but the underlying system does not matter) between two DPDK processes.
> 
> 
> But when I launch the secondary process, I get "RING: Cannot reserve memory". I modified the message to get the rte_errno, which is 17, File exists.  This also happens with testpmd.

Memory can not be allocated in the secondary process, but must request it from the primary. Is this the problem?

> 
> 
> I'm using DPDK 18.08. Using the ring API directly works without any problem. But I'd like to use the vdev one to build functional tests.
> 
> 
> I tried with the TAP pmd, the device is not available in the secondary process (rte_eth_dev_count_avail() is 0).
> 
> 
> Thanks,
> 
> Tom

Regards,
Keith

Re: [dpdk-users] ring vdev and secondary process

[Tom Barbette]

Hi Keith,

No it's not the problem. The ring is allocated by the primary. The secondary should just attach. Vdevs should be usable between multiple process from what I gathered.

Tom
________________________________________
De : Wiles, Keith <keith.wiles@intel.com>
Envoyé : lundi 3 septembre 2018 17:08
À : Tom Barbette
Cc : users@dpdk.org
Objet : Re: [dpdk-users] ring vdev and secondary process

> On Sep 3, 2018, at 3:40 PM, Tom Barbette <barbette@kth.se> wrote:
>
> Hi all,
>
>
> I'm trying to use virtual devices (ring-based PMD, but the underlying system does not matter) between two DPDK processes.
>
>
> But when I launch the secondary process, I get "RING: Cannot reserve memory". I modified the message to get the rte_errno, which is 17, File exists.  This also happens with testpmd.

Memory can not be allocated in the secondary process, but must request it from the primary. Is this the problem?

>
>
> I'm using DPDK 18.08. Using the ring API directly works without any problem. But I'd like to use the vdev one to build functional tests.
>
>
> I tried with the TAP pmd, the device is not available in the secondary process (rte_eth_dev_count_avail() is 0).
>
>
> Thanks,
>
> Tom

Regards,
Keith