Log: - Removed updates to if_ibytes, if_obytes, if_imcasts, and if_omcasts.   These should not be handled by the driver. - Add code to handle excessively fragmented mbufs when mapping TX frames.
Log:
- Removed updates to if_ibytes, if_obytes, if_imcasts, and if_omcasts.
  These should not be handled by the driver.
- Add code to handle excessively fragmented mbufs when mapping TX frames.

Reviewed by:	ps
Approved by:	ps (mentor)
MFC after:	1 week

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