MFC r246482 (rrs) + r246581:

This fixes a out-of-order problem with several of the newer
drivers. The basic problem was that the driver was pulling
the mbuf off the drbr ring and then when sending with xmit(),
encounting a full transmit ring. Thus the lower layer xmit()
function would return an error, and the drivers would then
append the data back on to the ring.  For TCP this is a
horrible scenario sure to bring on a fast-retransmit.

The fix is to use drbr_peek() to pull the data pointer but
not remove it from the ring. If it fails then we either call
the new drbr_putback or drbr_advance method. Advance moves
it forward (we do this sometimes when the xmit() function
frees the mbuf). When we succeed we always call advance.
The putback will always copy the mbuf back to the top of the
ring. Note that the putback *cannot* be used with a
drbr_dequeue() only with drbr_peek(). We most of the time,
in putback, would not need to copy it back since most likey
the mbuf is still the same, but sometimes xmit() functions
will change the mbuf via a pullup or other call. So the
optimial case for the single consumer is to always copy it
back.  If we ever do a multiple_consumer (for lagg?) we
will need a test and atomic in the put back possibly a
seperate putback_mc() in the ring buf.

Reviewed by:	jhb@freebsd.org, jlv@freebsd.org
MFC r257007,258140:

Update driver to version 10.0.664.0.

Many thanks to Emulex for their continued support of FreeBSD.

Submitted by:	Venkata Duvvuru <VenkatKumar.Duvvuru Emulex Com>