git: em: Free tx mbufs proactively.

[Sepherosa Ziehau]

commit 81745b3d67fa93f153b23699a4c8086b4709a868
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Tue Oct 31 12:51:56 2017 +0800

    em: Free tx mbufs proactively.
    
    This is preparation for the dillon's upcoming sendfile patch.

Summary of changes:
 sys/dev/netif/em/if_em.c | 155 +++++++++++++++++++++++++++++++++++------------
 sys/dev/netif/em/if_em.h |   6 ++
 2 files changed, 122 insertions(+), 39 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/81745b3d67fa93f153b23699a4c8086b4709a868


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