dpdk:dpdk-20.08 Host: Dell  ubuntu-PowerEdge-R740 22.04 virtual machine:arch linux kernel3.16.44 Virtual machine driver: virtio-transitional(0.95) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Problem Description: In virtio kernel driver,everything goes right. In dpdk,I get mac wrong on fist dpdk boot.when,dpdk reboot,mac is right. By debugging, in legacy_read_dev_config dpdk-virio read mac by wrong offset    <     rte_pci_ioport_read(VTPCI_IO(hw), dst, length,    <           VIRTIO_PCI_CONFIG(hw) + offset);   <   #define VIRTIO_PCI_CONFIG(hw) \   <            (((hw)->use_msix == VIRTIO_MSIX_ENABLED) ? 24 : 20) I found dpdk reads pci config with offset by hw->use_msix. In kernel dmesg, it shows that MSIX is enable.But,value of hw->misx in dpdk-virtio is uncertain. The above description causes the starting address of reading mac to be either 4 bits ahead or 4 bits behind. However, after restarting dpdk once,dpdk no longer uses the legacy interface, but the modern interface.The mac got through the modern interface is always correct. I don't know if this is a bug in dpdk,or there is something wrong with my environment?