MFC r181271.   Don't enable TSO by default. Users of RTL8169/8110 reported   watchdog timeout issues and the root cause seems to stem from   silicon bug of controller. Personally I couldn't reproduce it on   RTL8169 controller but it seems it's dependent on usage pattern.   For newer PCIe based controllers I have no TSO complaints but   turning off TSO would be more safe. Users who are sure that   their controller works with TSO can still reenable the TSO with   ifconfig(8).
MFC r181271.
  Don't enable TSO by default. Users of RTL8169/8110 reported
  watchdog timeout issues and the root cause seems to stem from
  silicon bug of controller. Personally I couldn't reproduce it on
  RTL8169 controller but it seems it's dependent on usage pattern.
  For newer PCIe based controllers I have no TSO complaints but
  turning off TSO would be more safe. Users who are sure that
  their controller works with TSO can still reenable the TSO with
  ifconfig(8).

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