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

[Stephen Hemminger]

On Mon, 10 Oct 2022 08:05:26 +0000
Dattu Gundu <dattu.gundu at oracle.com> wrote:

> 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 ?

No. There is no reason to use failsave if you you use tne native netvsc PMD.
Netvsc PMD has internal support for the accelerated SRIOV path.

> Question2: Is there any alternatives on Azure cloud ?

There are two alternatives vdev_netvsc/failsafe/tap or netvsc PMD

> 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.

Plead post full kernel config for your custom kernel, 
You will need the multi-queue prio qdisc to get the interface to TAP working.