Regarding Mellanox bifurcated driver on Azure

[Prashant Upadhyaya <praupadhyaya@gmail.com>]

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Hi,

I am having a VM on Azure where I have got two 'accelerated networking'
interfaces of Mellanox
# lspci -nn|grep -i ether
6561:00:02.0 Ethernet controller [0200]: Mellanox Technologies MT27710
Family [ConnectX-4 Lx Virtual Function] [15b3:1016] (rev 80)
f08c:00:02.0 Ethernet controller [0200]: Mellanox Technologies MT27710
Family [ConnectX-4 Lx Virtual Function] [15b3:1016] (rev 80)

I have a DPDK application which needs to obtain 'all' packets from the NIC.
I installed the drivers, compiled DPDK24.11 (Ubuntu20.04), my app starts
and is able to detect the NIC's.
Everything looks good
myapp.out -c 0x07 -a f08c:00:02.0 -a 6561:00:02.0
EAL: Detected CPU lcores: 8
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
mlx5_net: Default miss action is not supported.
mlx5_net: Default miss action is not supported.
All Ports initialized
Port 0 is UP (50000 Mbps)
Port 1 is UP (50000 Mbps)

The trouble is that the ARP packets are not being picked up by my DPDK
application, I see them being delivered to the kernel via the eth interface
corresponding to the port (MLX is a bifurcated driver, you don't really
bind to the NIC, so you still see the eth interfaces at linux level and can
run tcpdump on those, I see ARP packets in the tcpdump there on the
interface)
I can receive UDP packets in my DPDK app though.

My application is not setting any rte_flow rules etc. so I was expecting
that by default my dpdk app would get all the packets as is normally the
case with other NIC's
Is there something I need to configure for Mellanox NIC somewhere such that
I get 'all' the packets including ARP packets in my DPDK app ?

Regards
-Prashant

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