Re: [dpdk-users] Failed to bring-up DPDK ports on Azure VM

[madhukar mythri <madhukar.mythri@gmail.com>]

Hi Stephen,

Thanks for quick response.
Yes this error is from a TAP driver from DPDK, but why this error/issue
occurs only when configured with -2queues only ?
Whereas with single or 4 queues it works Rx/Tx traffic works well.

And also, this issue occurs only on single port-0, whereas on other ports
this error/issue is not seen.


On Sun, Apr 18, 2021 at 9:08 PM Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Sun, 18 Apr 2021 17:51:09 +0530
> madhukar mythri <madhukar.mythri@gmail.com> wrote:
>
> > Hi,
> >
> > When we tried to launch a DPDK app on Azure VM with 2-queues,
> > seeing following errors and thus we are not able to receive any traffic
> > on these NIC ports(MLX5).
> > On Azure VM, using "net_failsafe" PMD.
> >
> > =======================
> > PORT 0 Max supports 16 rx queues and 16 tx queues (driver_name =
> > net_failsafe, driver_type = 16)
> > PORT 0 is polling for link-change, interrupts disabled
> >  *rss_add_actions(): Failed to load BPF section l3_l4 (11): Resource
> > temporarily unavailable*
> >  net_failsafe: Failed to create flow on sub_device 1
> >  add_flow(): create() fails for port 0; Reason: action not supported
> > ===================
> >
> > This issue is seen with 2-queues only, whereas with 4-queues we are not
> > seeing this issue.
> >
> > Does anybody faced similar issue and if any solution/work-around please
> let
> > me know.
> >
> > DPDK version: 20.11
> > With RHEL: 7.9 version.
> >
> > Thanks,
> > Madhukar.
>
>
> If you are using failsafe, make sure that you have the Mellanox drivers
> enabled
> in your DPDK build, also TAP device. You need to build with rdma-core
> version 23 or
> later, and you need to have the kernel modules for flower, multiq, and TAP.
>
> Turn on full DPDK logging and check the kernel log (dmesg).
>