K 10
svn:author
V 5
andre
K 8
svn:date
V 27
2006-09-29T13:12:38.000000Z
K 7
svn:log
V 709
Handle all error cases from bus_dmamap_load_mbuf_sg().  Those are:

 - EFBIG means the mbuf chain was too long and bus_dma ran out of segments.
   Defragment the mbuf chain and try again. (Already existed, not changed.)
 - ENOMEM means bus_dma could not obtain enough bounce buffers at this point
   in time.  Defer sending and try again later.
 - All other errors, in particular EINVAL, are fatal and prevent the mbuf
   chain from ever going through.  Drop it and report error.
 - Checking (nsegs == 0) is unnecessary as bus_dmamap_load_mbuf_sg() always
   reports an error if it is < 1.

This prevents broken packets from clogging the interface queue indefinately.

Discussed with:	scottl
Reviewed by:	jfv

END