[External] : Re: qdisc errors on Azure VM (TAP Config)

[Dattu Gundu]

Hi Stephen, 

As Microsoft recommended in the below link to use the failsafe PMD in the AZURE.
https://learn.microsoft.com/en-us/azure/virtual-network/setup-dpdk#failsafe-pmd
So, we are using the failsafe/tap/vdev_netvsc  in AZURE cloud VM's. 


Question1: Can we use failsafe on top of NETVSC PMD on AZURE ?
Question2: Is there any alternatives on Azure cloud ?
Question3: If no alternatives, what are the required packages to be installed for QDISC ?



FYI, 

Flower, Mirred, Ingress already set in our config.

/tmp # cat config | grep FLOW
# CONFIG_NF_FLOW_TABLE is not set
CONFIG_NET_CLS_FLOW=y
CONFIG_NET_CLS_FLOWER=y
CONFIG_NET_FLOW_LIMIT=y
CONFIG_BNXT_FLOWER_OFFLOAD=y

/tmp # cat config | grep INGRESS
CONFIG_NET_INGRESS=y
CONFIG_NETFILTER_INGRESS=y
CONFIG_NET_SCH_INGRESS=y

/tmp # cat config | grep MIRRED
CONFIG_NET_ACT_MIRRED=y

/tmp # cat config | grep MQPRIO
# CONFIG_NET_SCH_MQPRIO is not set
/tmp #

Thanks,
Raghava Dattu.

-----Original Message-----
From: Stephen Hemminger <stephen at networkplumber.org> 
Sent: Thursday, October 6, 2022 10:02 PM
To: Dattu Gundu <dattu.gundu at oracle.com>
Cc: users at dpdk.org
Subject: [External] : Re: qdisc errors on Azure VM (TAP Config)

On Thu, 6 Oct 2022 06:08:59 +0000
Dattu Gundu <dattu.gundu at oracle.com> wrote:

> Hi,
> 
> I am observing the below errors during the bootup of Azure VM.
> 
> I understand these errors started popping from DPDK 20.11.1 due to 
> extended ack support was added in Linux version 4.17 And used for diagnosing the TAP config in kernel.
> 
> Is it because we are trying to delete the qdisc before they are created ?
> And looks like the failure is per queue. 
> 
> Am I missing any packages ?
> 
> How to avoid these errors ?
> If they are not serious, is there a way to suppress them ?
> 
> net_vdev_netvsc: probably using routed NetVSC interface "s0p0" (index 
> 7)
> tap_nl_dump_ext_ack(): Cannot delete qdisc with handle of zero
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> net_vdev_netvsc: probably using routed NetVSC interface "s1p0" (index 
> 8)
> tap_nl_dump_ext_ack(): Cannot delete qdisc with handle of zero
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> tap_nl_dump_ext_ack(): Failed to find qdisc with specified classid
> 
> Currently using below kernel: 
> 5.4.17
> x86_64
> GNU/Linux
> #3 SMP PREEMPT Thu Aug 18 05:23:39 UTC 2022
> 
> Thanks,
> Raghava Dattu.

If possible use netvsc PMD and not the older vdev_netvsc/failsafe/tap stuff.

Are you sure your kernel has all the necessary qdisc to run the failsafe/tap device. It needs to have flower, mirred, mqprio, etc.