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: NLaura Mihaela Vasilescu <laura.vasilescu@rosedu.org> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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