git: igb: Configure TX head write back before turn enable bit in TXDCTL

[Sepherosa Ziehau <sephe@xxxxxxxxxxxxxxxxxxxxxxx>]

commit c7c6ca4442476f8401fd722e374c0a2d341ed7cd
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date:   Wed Nov 7 21:47:59 2012 +0800

    igb: Configure TX head write back before turn enable bit in TXDCTL
    
    The original configure sequence works on 82575 and 82576.  However,
    it does not work on i350 and probably will not work on 82580.  For
    these two chips TX head write back _must_ be configured before
    turning on enable bit in TXDCTL according to their datasheet.
    
    Reported-by: ftigeot@
    Tested-by: ftigeot@ (i350), me w/ (82575, 82576)

Summary of changes:
 sys/dev/netif/igb/if_igb.c |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/c7c6ca4442476f8401fd722e374c0a2d341ed7cd


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