Hi All, Have a Qs related to-> access to different ports on the same NIC by 2 DPDK applications.
Setup: 4-Port 10 Gig NIC card with ports bound for DPDK usage. With intel’s igb_uio kernel driver (used for binding NIC’s ports) using dpdk-setup.sh, at the /dev level, I see 4 device paths created, /dev/uio0, /dev/uio1, /dev/ui02, /dev/uio3 And I was able to run 2 DPDK applications concurrently(by blacklisting the ports in EAL parameters), and they were able to take ownership of different ports on the same NIC. For example DPDK_APP1 can take access of ports->0,1 and DPDK_APP2 can take access of ports->2,3. Currently, I am using another DPDK app that relies on binding to VFIO driver. So I am trying to switch to binding NIC’s 4 ports to VFIO driver. Enabled VTIO in BIOS and added intel_iommu=on in kernel boot-param in GRUB. After binding all 4 ports to VFIO driver, using dpdk-setup,sh, at the /dev level, I only see these 2 device paths created-> /dev/vfio/vfio(control channel) and /dev/vfio/1(essentially just 1 path). I am able to run one DPDK application, for example-> PacketGen tool. But not able to run 2 DPDK applications concurrently accessing different ports on the same NIC, due to DPDK application not being able to get access to the ports. For example, if I launch DPDK_APP1 first, it can get access to the ports, but DPDK_APP2 is NOT able to get access, and vice-versa. Note that both apps are trying to access different ports on the same NIC, and also ports have been black-listed as part of EAL params to the DPDK apps. I know this is possible with igb_uio driver. Please let me know, if it is possible to do this when ports are bound to VFIO driver. Thanks, Sudha
