MLX5_VSC_DATA_OFFSET
pci_read_config(dev, vsc_addr + MLX5_VSC_DATA_OFFSET, 4);
pci_read_config(dev, vsc_addr + MLX5_VSC_DATA_OFFSET, 4);
pci_write_config(dev, vsc_addr + MLX5_VSC_DATA_OFFSET, *data, 4);
*data = pci_read_config(dev, vsc_addr + MLX5_VSC_DATA_OFFSET, 4);