igb: move rx_buffer_len into the ring structure

This patch moves the rx_buffer_len value into the ring structure.  This allows
greater flexibility and the option of doing things such as supporting packet
split only on some queues, or enabling virtualization.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/igb.h

@@ -198,7 +198,7 @@ struct igb_ring {
 		/* RX */
 		struct {
 			struct igb_rx_queue_stats rx_stats;
-			u64 rx_queue_drops;
+			u32 rx_buffer_len;
 		};
 	};
 };
@@ -218,7 +218,6 @@ struct igb_adapter {
 	struct vlan_group *vlgrp;
 	u16 mng_vlan_id;
 	u32 bd_number;
-	u32 rx_buffer_len;
 	u32 wol;
 	u32 en_mng_pt;
 	u16 link_speed;