Adrian Chadd 1c2427605c Set DROP_EN on each RX queue if transmit flow-control is disabled.
This allows the NIC to drop frames on the receive queue and not
cause the MAC to block on receiving to _any_ queue.

Tested:

igb0@pci0:5:0:0:        class=0x020000 card=0x152115d9 chip=0x15218086 rev=0x01 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'I350 Gigabit Network Connection'
    class      = network
    subclass   = ethernet

Discussed with: Eric Joyner <eric.joyner@intel.com>

MFC after:	1 week
Sponsored by:	Norse Corp, Inc.
2014-09-15 19:53:49 +00:00
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