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When compared to ixgbe and other previous Intel drivers the i40e and i40evf drivers actually reserve 2 additional descriptors in maybe_stop_tx for cache line alignment. We need to update DESC_NEEDED to reflect this as otherwise we are more likely to return TX_BUSY which will cause issues with things like xmit_more. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>