[Bug 21] Ixgbe driver changes FCTRL without first disabling RXCTRL.RXEN

[Bug 21] Ixgbe driver changes FCTRL without first disabling RXCTRL.RXEN

[bugzilla]

https://dpdk.org/tracker/show_bug.cgi?id=21

            Bug ID: 21
           Summary: Ixgbe driver changes FCTRL without first disabling
                    RXCTRL.RXEN
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: normal
          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,
§8.2.3.7.1) states that "Before receive filters are updated/modified the
RXCTRL.RXEN bit should be set to 0b. After the proper filters have been set the
RXCTRL.RXEN bit can be set to 1b to re-enable the receiver."

However, the ixgbe driver's promiscuous and allmulticast enable/disable
functions edit the FCTRL filters without disabling (or at least checking)
RXCTRL.RXEN. (e.g.
http://dpdk.org/browse/dpdk/tree/drivers/net/ixgbe/ixgbe_ethdev.c?h=v18.02#n4053)

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