igb: Add ethtool support to configure number of channels
This patch adds the ethtool callbacks necessary to configure the number of RSS queues. The maximum number of queues is in accordance with the datasheets. Signed-off-by: Laura Mihaela Vasilescu <laura.vasilescu@rosedu.org> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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