bnx2x: MTU for FCoE L2 ring

Always configure an FCoE L2 ring with a mini-jumbo MTU size (2500).
To do that we had to move the rx_buf_size parameter from per
function level to a per ring level.

Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bnx2x/bnx2x_cmn.h b/drivers/net/bnx2x/bnx2x_cmn.h
index 03eb4d6..f062d5d 100644
--- a/drivers/net/bnx2x/bnx2x_cmn.h
+++ b/drivers/net/bnx2x/bnx2x_cmn.h
@@ -822,11 +822,11 @@
 	struct eth_rx_bd *rx_bd = &fp->rx_desc_ring[index];
 	dma_addr_t mapping;
 
-	skb = netdev_alloc_skb(bp->dev, bp->rx_buf_size);
+	skb = netdev_alloc_skb(bp->dev, fp->rx_buf_size);
 	if (unlikely(skb == NULL))
 		return -ENOMEM;
 
-	mapping = dma_map_single(&bp->pdev->dev, skb->data, bp->rx_buf_size,
+	mapping = dma_map_single(&bp->pdev->dev, skb->data, fp->rx_buf_size,
 				 DMA_FROM_DEVICE);
 	if (unlikely(dma_mapping_error(&bp->pdev->dev, mapping))) {
 		dev_kfree_skb(skb);
@@ -892,7 +892,7 @@
 		if (fp->tpa_state[i] == BNX2X_TPA_START)
 			dma_unmap_single(&bp->pdev->dev,
 					 dma_unmap_addr(rx_buf, mapping),
-					 bp->rx_buf_size, DMA_FROM_DEVICE);
+					 fp->rx_buf_size, DMA_FROM_DEVICE);
 
 		dev_kfree_skb(skb);
 		rx_buf->skb = NULL;