Luiz Otavio O Souza 904e8e891b Simplify the handling of small packets padding in cpsw:
- Pad small packets to 60 bytes and not 64 (exclude the CRC bytes);
 - Pad the packet using m_append(9), if the packet has enough space for
   padding, which is usually true, it will not be necessary append a newly
   allocated mbuf to the chain.

Suggested by:	yongari
MFC after:	3 days
Sponsored by:	Rubicon Communications, LLC (Netgate)
2017-01-21 19:49:39 +00:00
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