Bill Paul 274342303b Add a transmit descriptor usage counter and use it to absolutely,
positively not let ti_encap() fill up the TX ring all the way and wrap
around. This fixes a potential transmit lockup where a really fast
machine (or particular TX traffic pattern) can overrun the end of the
ring.

Reported by: John Plevyak <jplevyak@inktomi.com>
1999-06-19 00:36:56 +00:00
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