[Bug 191384] New: ixgbe driver failed to identify PCI-Express slot bandwidth on 10-STABLE and 9.3-RC1, 10.0-RELEASE is partialy affected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191384

            Bug ID: 191384
           Summary: ixgbe driver failed to identify PCI-Express slot
                    bandwidth on 10-STABLE and 9.3-RC1, 10.0-RELEASE is
                    partialy affected
           Product: Base System
           Version: 10.0-STABLE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: avv314 at gmail.com

Hardware is Dell R510, 2xCPU E5620, 32GB RAM
Intel 10Gb SR Server Adapter:
ix0 at pci0:3:0:0: class=0x020000 card=0xa05f8086 chip=0x10c78086 rev=0x01
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82598EB 10-Gigabit AF Network Connection'
    class      = network
    subclass   = ethernet

If this 10Gb card inserted into PCI-E x8 Gen2 slot:
Booting FreeBSD 10.0-STABLE #0 r267874:
ix0: <Intel(R) PRO/10GbE PCI-Express Network Driver, Version - 2.5.15> port
0xece0-0xecff mem
0xdf2a0000-0xdf2bffff,0xdf2c0000-0xdf2fffff,0xdf29c000-0xdf29ffff irq 38 at
device 0.0 on pci3
ix0: Using MSIX interrupts with 9 vectors
ix0: Ethernet address: 00:1b:21:5c:83:11
ix0: PCI Express Bus: Speed 2.5GT/s Width x1
ix0: PCI-Express bandwidth available for this card
     is not sufficient for optimal performance.
ix0: For optimal performance a x8 PCIE, or x4 PCIE Gen2 slot is required.
Same situation for 9.3-RC1, but I have no dmesg output for it, so may be not
excatly.

Booting 10.0-RELEASE seems is Ok. But fail to detect Gen2.
ix0: <Intel(R) PRO/10GbE PCI-Express Network Driver, Version - 2.5.15> port
0xece0-0xecff mem
0xdf2a0000-0xdf2bffff,0xdf2c0000-0xdf2fffff,0xdf29c000-0xdf29ffff irq 38 at
device 0.0 on pci3
ix0: Using MSIX interrupts with 9 vectors
ix0: Ethernet address: 00:1b:21:5c:83:11
ix0: PCI Express Bus: Speed 2.5GT/s Width x8

When same card inserted into x4 Gen2 slot, 10.0-RELEASE also fail to detect
Gen2:
ix0: <Intel(R) PRO/10GbE PCI-Express Network Driver, Version - 2.5.15> port
0xdce0-0xdcff mem
0xdf4a0000-0xdf4bffff,0xdf4c0000-0xdf4fffff,0xdf49c000-0xdf49ffff irq 41 at
device 0.0 on pci5
ix0: Using MSIX interrupts with 9 vectors
ix0: Ethernet address: 00:1b:21:5c:83:11
ix0: PCI Express Bus: Speed 2.5GT/s Width x4
ix0: PCI-Express bandwidth available for this card
     is not sufficient for optimal performance.
ix0: For optimal performance a x8 PCIE, or x4 PCIE Gen2 slot is required.

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