K 10
svn:author
V 8
hselasky
K 8
svn:date
V 27
2018-03-26T21:03:33.636910Z
K 7
svn:log
V 815
MFC r330658:
Fix mlx5en(4) driver to properly call m_defrag().

When the mlx5en(4) driver was converted to using BUSDMA(9) the call to
m_defrag() was moved after the part of the TX routine that strips the
header from the mbuf chain. Before it called m_defrag it first trimmed
off the now-empty mbufs from the start of the chain. This has the side
effect of also removing the head of the chain that has M_PKTHDR set.
m_defrag() will not defrag a chain that does not have M_PKTHDR set,
thus it was effectively never defragging the mbuf chains.

As it turns out, trimming the mbufs in this fashion is unnecessary since
the call to bus_dmamap_load_mbuf_sg doesn't map empty mbufs anyway, so
remove it.

Differential Revision:	https://reviews.freebsd.org/D12050
Submitted by:	mjoras@
Sponsored by:	Mellanox Technologies

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