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- check for error bits in descriptors, and count and report errors
accordingly; make sure we do not pass up known-to-be-bad packets up the
receive path.
- check for various error conditions which would cause the transmit process
to go to suspended state, and recover from them, before the timeout expires.
- finally, on the VXT2000, the transmit process for some reason will reset
its ring position to the beginning of the ring every time it completes a
transmission burst, while we don't, so play with the head of ring register
behind its back. This makes my VXT2000+ (net)boot multiuser.
Tested on VXT2000 (ze@vxtbus), KA49 (ze@vsbus) and KA53 (ze@ibus); ok deraadt@
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