ixgbevf driver enabling in RHEL 7.1

Hi,

I am trying to enable ixgbevf in RHEL 7.1
Procedures followed
1. enabled SR-IOV support in BIOS
2.Intel-Vt enabled in BIOS
3. /etc/modprobe.d/sriov.conf updated with options ixgbe max_vfs=1

Reboot. However after reboot, ixgbevf are not enabled. Whether the kernel enables ixgbevf by defalut ? i couldn't see that

~]# lsmod | grep ixg
ixgbe 290931 0
mdio 13807 1 ixgbe
ptp 18933 2 igb,ixgbe
dca 15130 3 igb,ixgbe,ioatdma