I'm working on a Dell R720 server. The NIC daugherboard has 4 ports.
Qty 2 ports with X540-AT2 and Qty 2 ports with I350.

Using kernel 2.6.39-100.7.1.el6uek.x86_64 using ixgbe 3.9.15 and igb 3.4.7.

The max_vfs parameter is working properly with ixgbe NIC ports, but
max_vfs is failing with the igb driver.

# cat /etc/modprobe.d/ixgbe.conf
options ixgbe max_vfs=32,32
# cat /etc/modprobe.d/igb.conf
options igb max_vfs=7,7

# lspci
01:00.0 Ethernet controller: Intel Corporation Ethernet Controller 10
Gigabit X540-AT2 (rev 01)
01:00.1 Ethernet controller: Intel Corporation Ethernet Controller 10
Gigabit X540-AT2 (rev 01)
08:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network
Connection (rev 01)
08:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network
Connection (rev 01)

# dmesg
Intel(R) Gigabit Ethernet Network Driver - version 3.4.7
Copyright (c) 2007-2011 Intel Corporation.
igb 0000:08:00.0: PCI INT D -> GSI 19 (level, low) -> IRQ 19
igb 0000:08:00.0: setting latency timer to 64
igb: 0000:08:00.0: igb_validate_option: max_vfs - SR-IOV VF devices set to 7

igb 0000:08:00.0: Failed to initialize SR-IOV virtualization

igb 0000:08:00.0: irq 125 for MSI/MSI-X
igb 0000:08:00.0: irq 126 for MSI/MSI-X
igb 0000:08:00.0: Intel(R) Gigabit Ethernet Network Connection
igb 0000:08:00.0: eth2: (PCIe:5.0GT/s:Width x2
)
igb 0000:08:00.0: eth2: MAC: bc:30:5b:ef:bf:14
igb 0000:08:00.0: eth2: PBA No: G14843-011
igb 0000:08:00.0: LRO is disabled
igb 0000:08:00.0: Using MSI-X interrupts. 1 rx queue(s), 1 tx queue(s)
igb 0000:08:00.1: PCI INT C -> GSI 18 (level, low) -> IRQ 18
igb 0000:08:00.1: setting latency timer to 64
igb: 0000:08:00.1: igb_validate_option: max_vfs - SR-IOV VF devices set to 7

igb 0000:08:00.1: Failed to initialize SR-IOV virtualization

igb 0000:08:00.1: irq 127 for MSI/MSI-X
igb 0000:08:00.1: irq 128 for MSI/MSI-X
igb 0000:08:00.1: Intel(R) Gigabit Ethernet Network Connection
igb 0000:08:00.1: eth3: (PCIe:5.0GT/s:Width x2
)
igb 0000:08:00.1: eth3: MAC: bc:30:5b:ef:bf:15
igb 0000:08:00.1: eth3: PBA No: G14843-011
igb 0000:08:00.1: LRO is disabled
igb 0000:08:00.1: Using MSI-X interrupts. 1 rx queue(s), 1 tx queue(s)

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