bge/brg: no carrier after cable disconnect/reconnect

[Sverre Froyen <sverre%viewmark.com@localhost>]

Hi,

I was performing some network maintenance and noticed that after disconnecting and reconnecting bge/brgphy interfaces, the interfaces are stuck in a “no carrier” state. I’m pretty sure this used not to be case but I have no idea how long ago that was. It appears that the only way to revive a stuck interface it to reboot the computer.

Here’s some data for the computer:

NetBSD 6.1_STABLE (VM) #12: Fri Jan  2 09:32:36 MST 2015
Dell Computer Corporation PowerEdge 2650

bge0 at pci1 dev 6 function 0: Broadcom BCM5701 Gigabit Ethernet
bge0: interrupting at ioapic1 pin 12
bge0: HW config 00000019, 00000000, 00000000, 00000000 00000000
bge0: ASIC BCM5701 B5 (0x105), Ethernet address 00:06:5b:fd:79:a6
brgphy0 at bge0 phy 1: BCM5701 1000BASE-T media interface, rev. 0
brgphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto

The interface is connected (twisted pair) to a 100Mb/s switch (also Dell).

The sources were updated 2 Jan.

ifconfig output (in the running state):

bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	capabilities=3f00<IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx>
	enabled=3f00<IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx>
	address: xx:xx:xx:xx:xx:xx
	media: Ethernet autoselect (100baseTX full-duplex,flowcontrol,rxpause,txpause)
	status: active
	inet xxx.xxx.xxx.xxx netmask 0xffffffc0 broadcast xxx.xxx.xxx.xxx
	inet6 fe80::206:5bff:fefd:79a6%bge0 prefixlen 64 scopeid 0x1

I believe this also happens with bnx/brgphy interfaces (on amd64).

Any suggestions?

Regards,
Sverre