ionic: add helpers for accessing buffer info

These helpers clean up some of the code around DMA mapping
and other buffer references, and will be used in the next
few patches for the XDP support.
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_txrx.c

@@ -88,6 +88,21 @@ static inline struct netdev_queue *q_to_ndq(struct ionic_queue *q)
 	return netdev_get_tx_queue(q->lif->netdev, q->index);
 }
 
+static void *ionic_rx_buf_va(struct ionic_buf_info *buf_info)
+{
+	return page_address(buf_info->page) + buf_info->page_offset;
+}
+
+static dma_addr_t ionic_rx_buf_pa(struct ionic_buf_info *buf_info)
+{
+	return buf_info->dma_addr + buf_info->page_offset;
+}
+
+static unsigned int ionic_rx_buf_size(struct ionic_buf_info *buf_info)
+{
+	return min_t(u32, IONIC_MAX_BUF_LEN, IONIC_PAGE_SIZE - buf_info->page_offset);
+}
+
 static int ionic_rx_page_alloc(struct ionic_queue *q,
 			       struct ionic_buf_info *buf_info)
 {
@@ -207,12 +222,11 @@ static struct sk_buff *ionic_rx_frags(struct ionic_queue *q,
 			return NULL;
 		}
 
-		frag_len = min_t(u16, len, min_t(u32, IONIC_MAX_BUF_LEN,
-						 IONIC_PAGE_SIZE - buf_info->page_offset));
+		frag_len = min_t(u16, len, ionic_rx_buf_size(buf_info));
 		len -= frag_len;
 
 		dma_sync_single_for_cpu(dev,
-					buf_info->dma_addr + buf_info->page_offset,
+					ionic_rx_buf_pa(buf_info),
 					frag_len, DMA_FROM_DEVICE);
 
 		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
@@ -262,10 +276,10 @@ static struct sk_buff *ionic_rx_copybreak(struct ionic_queue *q,
 		return NULL;
 	}
 
-	dma_sync_single_for_cpu(dev, buf_info->dma_addr + buf_info->page_offset,
+	dma_sync_single_for_cpu(dev, ionic_rx_buf_pa(buf_info),
 				len, DMA_FROM_DEVICE);
-	skb_copy_to_linear_data(skb, page_address(buf_info->page) + buf_info->page_offset, len);
-	dma_sync_single_for_device(dev, buf_info->dma_addr + buf_info->page_offset,
+	skb_copy_to_linear_data(skb, ionic_rx_buf_va(buf_info), len);
+	dma_sync_single_for_device(dev, ionic_rx_buf_pa(buf_info),
 				   len, DMA_FROM_DEVICE);
 
 	skb_put(skb, len);
@@ -452,9 +466,8 @@ void ionic_rx_fill(struct ionic_queue *q)
 		}
 
 		/* fill main descriptor - buf[0] */
-		desc->addr = cpu_to_le64(buf_info->dma_addr + buf_info->page_offset);
-		frag_len = min_t(u16, len, min_t(u32, IONIC_MAX_BUF_LEN,
-						 IONIC_PAGE_SIZE - buf_info->page_offset));
+		desc->addr = cpu_to_le64(ionic_rx_buf_pa(buf_info));
+		frag_len = min_t(u16, len, ionic_rx_buf_size(buf_info));
 		desc->len = cpu_to_le16(frag_len);
 		remain_len -= frag_len;
 		buf_info++;
@@ -472,10 +485,8 @@ void ionic_rx_fill(struct ionic_queue *q)
 				}
 			}
 
-			sg_elem->addr = cpu_to_le64(buf_info->dma_addr + buf_info->page_offset);
-			frag_len = min_t(u16, remain_len, min_t(u32, IONIC_MAX_BUF_LEN,
-								IONIC_PAGE_SIZE -
-								buf_info->page_offset));
+			sg_elem->addr = cpu_to_le64(ionic_rx_buf_pa(buf_info));
+			frag_len = min_t(u16, remain_len, ionic_rx_buf_size(buf_info));
 			sg_elem->len = cpu_to_le16(frag_len);
 			remain_len -= frag_len;
 			buf_info++;