tg3: remove use of skb_dma_map/unmap

Due to the fact that skb_dma_map/unmap do not work correctly when a HW
IOMMU is enabled it has been recommended to go about removing the calls
from the network device drivers.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: Matt Carlson <mcarlson@broadcom.com>
CC: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.h

@@ -2441,10 +2441,6 @@ struct ring_info {
 	DECLARE_PCI_UNMAP_ADDR(mapping)
 };
 
-struct tx_ring_info {
-	struct sk_buff			*skb;
-};
-
 struct tg3_config_info {
 	u32				flags;
 };
@@ -2608,7 +2604,7 @@ struct tg3_napi {
 
 	struct tg3_rx_buffer_desc	*rx_rcb;
 	struct tg3_tx_buffer_desc	*tx_ring;
-	struct tx_ring_info		*tx_buffers;
+	struct ring_info		*tx_buffers;
 
 	dma_addr_t			status_mapping;
 	dma_addr_t			rx_rcb_mapping;