[Bug 239240] igb: TX(2) desc avail = 1024, pidx = 0 messages appear when the network card loses ethernet link

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239240

Ozkan KIRIK <ozkan.kirik at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ozkan.kirik at gmail.com

--- Comment #5 from Ozkan KIRIK <ozkan.kirik at gmail.com> ---
I have tested same problem with;

- Intel i210 (igb)
- Intel i350 (igb)
- Intel x540 (ixgbe)
- Intel x520 (ixgbe)

all cards above. When the active cable uplugged, TX desc avail messages
starting to repeat and ifconfig down/up sometimes works sometime not works.
Usually a reboot needs to start working again.

But ixl cards (Intel x710 ie) are working stable. There is no such problem
about ixl.

In addition to cable unplug, mediaselect configuration change also triggers TX
desc avail bug.

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