[Bug 221439] ix ethernet doesn't link to switch if vlans are enabled.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221439

            Bug ID: 221439
           Summary: ix ethernet doesn't link to switch if vlans are
                    enabled.
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: wojtek at puchar.net

Intel 10Gbe interface (ix driver)  cannot link at 1Gb/s to a switch IF any vlan
on that interface is enabled. With no vlan enabled it connects fine.

Temporary workaround is to delay creating vlans until link is up.

FreeBSD puchar.net 11.1-PRERELEASE FreeBSD 11.1-PRERELEASE #5: Sat Aug 12
10:51:41 CEST 2017     root at puchar.net:/usr/src/sys/amd64/compile/puchar  amd64


ix0: <Intel(R) PRO/10GbE PCI-Express Network Driver, Version - 3.2.12-k> port
0xe020-0xe03f mem 0xfbc00000-0xfbdfffff,0xfbe04000-0xfbe07fff irq 42 at device
0.0 on pci4
ix0: Using MSI-X interrupts with 9 vectors
ix0: Ethernet address: 0c:c4:7a:6e:7e:9e
ix0: PCI Express Bus: Speed 5.0GT/s Width x8

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