net/mlx4_en: call gro handler for encapsulated frames

In order to use the native GRO handling of encapsulated protocols on
mlx4, we need to call napi_gro_receive() instead of netif_receive_skb()
unless busy polling is in action.

While we are at it, rename mlx4_en_cq_ll_polling() to
mlx4_en_cq_busy_polling()

Tested with GRE tunnel : GRO aggregation is now performed on the
ethernet device instead of being done later on gre device.

Signed-off-by: Eric Dumazet <[email protected]>
Cc: Amir Vadai <[email protected]>
Cc: Jerry Chu <[email protected]>
Cc: Or Gerlitz <[email protected]>
Acked-By: Amir Vadai <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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