<div dir="ltr"><div>Hi,</div> We are migrating our DPDK App from “failsafe” to “netvsc” PMD as per the recommendation of Microsoft. “Failsafe” PMD works well on both Azure cloud and on-prem Hyper-V VM(Linux) machines using the DPDK “testpmd” app. Whereas “Netvsc” PMD works well only on Azure cloud with both(AN enabled/disabled options), But not working on the on-prem local Hyper-V Linux VM(based on RHEL-9). We could not receive any packets on the synthetic device when we test with DPDK “testpmd”. The Network Adapter(without SR-IOV enable) connection is good from the Hyper-V switch to VM, we could receive packets on the Kernel-mode driver “hv_netvsc” network interface, but, once we bind the VMbus network device to “uio_hv_generic” as follows and load “testpmd” App, we could not receive any pkts on Rx as per the port stats. Steps to bind network device from “hv_netvsc” to “uio_hv_generic” and start the “testpmd” app: ====================== NET_UUID="f8615163-df3e-46c5-913f-f2d2f965ed0e" modprobe uio_hv_generic echo $NET_UUID > /sys/bus/vmbus/drivers/uio_hv_generic/new_id echo $DEV_UUID > /sys/bus/vmbus/drivers/hv_netvsc/unbind echo $DEV_UUID > /sys/bus/vmbus/drivers/uio_hv_generic/bind ./dpdk-testpmd -l 2-3 -n 2 -v --legacy-mem -- -i --mbcache=64 ================ Here, DEV_UUID got from the synthetic kernel interface using “cat /sys/class/net/eth0/device/device_id”. Once we start the “testpmd” as mentioned above we could see the driver-name properly as “net_netvsc” and we could “start” the DPDK ports well without any Errors as shown below. These steps works well on Azure cloud VM with AN enabled/disabled and we could receive the traffic on Rx stats well. It looks like, Hyper-V setup issue, as the above steps works fine on Azure-VM and not working on local Hyper-V(Windows 2016 based) VM(Linux RHEL-9). Has anybody tried local on-prem Windows Hyper-V VM(Linux) DPDK App’s ? If so, please let me know, any suggestions on this issue. Linux-kernel version on VM: 5.15.0 DPDK-version: 24.11 Sample output of “testpmd” App as follows: ==================== ./dpdk-testpmd -l 2-3 -n 2 -v --legacy-mem -- -i --mbcache=64 EAL: Detected CPU lcores: 8 EAL: Detected NUMA nodes: 1 EAL: Static memory layout is selected, amount of reserved memory can be adjusted with -m or --socket-mem EAL: Detected static linkage of DPDK EAL: Multi-process socket /var/run/dpdk/rte/mp_socket EAL: Selected IOVA mode 'PA' Interactive-mode selected testpmd: create a new mbuf pool <mb_pool_0>: n=149504, size=2176, socket=0 testpmd: preferred mempool ops selected: ring_mp_mc Configuring Port 0 (socket 0) Port 0: 00:15:5D:2E:CC:1E Configuring Port 1 (socket 0) Port 1: 00:15:5D:2E:CC:1F Checking link statuses... Done testpmd> sh port info 0 Command not found testpmd> show port info 0 ********************* Infos for port 0 ********************* MAC address: 00:15:5D:2E:CC:1E Device name: 7cac5c55-1a7c-4690-a70c-13d4acbb35ac Driver name: net_netvsc Firmware-version: not available Connect to socket: 0 memory allocation on the socket: 0 Link status: up Link speed: 10 Gbps Link duplex: full-duplex Autoneg status: On MTU: 1500 Promiscuous mode: enabled Allmulticast mode: disabled Maximum number of MAC addresses: 1 Maximum number of MAC addresses of hash filtering: 0 VLAN offload: strip off, filter off, extend off, qinq strip off Hash key size in bytes: 40 Redirection table size: 128 Supported RSS offload flow types: ipv4 ipv4-tcp ipv4-udp ipv6 ipv6-tcp Minimum size of RX buffer: 1024 Maximum configurable length of RX packet: 16128 Maximum configurable size of LRO aggregated packet: 0 Current number of RX queues: 1 Max possible RX queues: 64 Max possible number of RXDs per queue: 65535 Min possible number of RXDs per queue: 0 RXDs number alignment: 1 Current number of TX queues: 1 Max possible TX queues: 64 Max possible number of TXDs per queue: 4096 Min possible number of TXDs per queue: 1 TXDs number alignment: 1 Max segment number per packet: 65535 Max segment number per MTU/TSO: 65535 Device capabilities: 0x0( ) Device error handling mode: none Device private info: none testpmd> testpmd> start io packet forwarding - ports=2 - cores=1 - streams=2 - NUMA support enabled, MP allocation mode: native Logical Core 3 (socket 0) forwards packets on 2 streams: RX P=0/Q=0 (socket 0) -> TX P=1/Q=0 (socket 0) peer=02:00:00:00:00:01 RX P=1/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00 io packet forwarding packets/burst=32 nb forwarding cores=1 - nb forwarding ports=2 port 0: RX queue number: 1 Tx queue number: 1 Rx offloads=0x0 Tx offloads=0x0 RX queue: 0 RX desc=512 - RX free threshold=0 RX threshold registers: pthresh=0 hthresh=0 wthresh=0 RX Offloads=0x0 TX queue: 0 TX desc=512 - TX free threshold=0 TX threshold registers: pthresh=0 hthresh=0 wthresh=0 TX offloads=0x0 - TX RS bit threshold=0 port 1: RX queue number: 1 Tx queue number: 1 Rx offloads=0x0 Tx offloads=0x0 RX queue: 0 RX desc=512 - RX free threshold=0 RX threshold registers: pthresh=0 hthresh=0 wthresh=0 RX Offloads=0x0 TX queue: 0 TX desc=512 - TX free threshold=0 TX threshold registers: pthresh=0 hthresh=0 wthresh=0 TX offloads=0x0 - TX RS bit threshold=0 testpmd> testpmd> show port stats 0 ######################## NIC statistics for port 0 ######################## RX-packets: 0 RX-missed: 0 RX-bytes: 0 RX-errors: 0 RX-nombuf: 0 TX-packets: 0 TX-errors: 0 TX-bytes: 0 Throughput (since last show) Rx-pps: 0 Rx-bps: 0 Tx-pps: 0 Tx-bps: 0 ############################################################################ testpmd> ==================== We had pumped the traffic from another machine to this MAC address. <div> </div><div>Thanks,</div><div>Madhukar.</div></div>