MFC r314365

MFC r314365
      1. state checks in bxe_tx_mq_start_locked() and bxe_tx_mq_start() to
         sync threads during interface down or detach.
      2. add sysctl to set pause frame parameters
      3. increase max segs for TSO packets to BXE_TSO_MAX_SEGMENTS (32)
      4. add debug messages for PHY
      5. HW LRO support restricted to FreeBSD versions 8.x and above.

Submitted by:	Vaishali.Kulkarni@cavium.com

git-svn-id: svn://svn.freebsd.org/base/stable/8@315884 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f