git: DragonFly_RELEASE_3_2 igb: Configure TX head write back before turn enable bit in TXDCTL

[Sepherosa Ziehau <sephe@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 904664dba5ad96f3b803b5917173caa2e8c84576
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/904664dba5ad96f3b803b5917173caa2e8c84576


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