igb: Add support for byte queue limits.
This adds support for byte queue limits (BQL) Since this driver collects bytes count in 'bytecount' field, use it also in igb_tx_map() Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> CC: Alexander Duyck <alexander.h.duyck@intel.com> 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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