[Bug 23] Ixgbe driver writes to reserved bit in the EIMC register

[Bug 23] Ixgbe driver writes to reserved bit in the EIMC register

[bugzilla]

https://dpdk.org/tracker/show_bug.cgi?id=23

            Bug ID: 23
           Summary: Ixgbe driver writes to reserved bit in the EIMC
                    register
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: minor
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: solal.pirelli@gmail.com
  Target Milestone: ---

The Intel 82599 data sheet
(https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/82599-10-gbe-controller-datasheet.pdf,
§8.2.3.5.4) states that bit 31 of the EIMC register is reserved.

However, the ixgbe driver writes to this bit anyway, e.g. in
ixgbe_stop_adapter_generic
(http://dpdk.org/browse/dpdk/tree/drivers/net/ixgbe/base/ixgbe_common.c?h=v18.02#n1126
with the mask defined as all-1s in
http://dpdk.org/browse/dpdk/tree/drivers/net/ixgbe/base/ixgbe_type.h?h=v18.02#n2047).

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