git: em: Don't update TDT upon very packets transmitted

[Sepherosa Ziehau <sephe@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 893bb181c090d408f132963afc9917e844dfd9e8
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date:   Fri Dec 28 15:12:02 2012 +0800

    em: Don't update TDT upon very packets transmitted
    
    Merged following commits on emx(4):
    7f32a9b0f8f25e43ab2ae4ee0d82ce69325d3b4b
    0aba36eb844503423f414a3235eca72a78dc575a
    b691889cfe23462069618f44bcf2ba0e71dcbb79
    
    With following exception:
    This optimization is not performed for 82547

Summary of changes:
 sys/dev/netif/em/if_em.c |   57 ++++++++++++++++++++++++++++++++-------------
 sys/dev/netif/em/if_em.h |    2 +
 2 files changed, 42 insertions(+), 17 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/893bb181c090d408f132963afc9917e844dfd9e8


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