Merge branch 'r8169-improve-rtl_rx-and-NUM_RX_DESC-handling'

Heiner Kallweit says:

====================
r8169: improve rtl_rx and NUM_RX_DESC handling

This series improves rtl_rx() and the handling of NUM_RX_DESC.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -68,7 +68,7 @@
 #define R8169_REGS_SIZE		256
 #define R8169_RX_BUF_SIZE	(SZ_16K - 1)
 #define NUM_TX_DESC	256	/* Number of Tx descriptor registers */
-#define NUM_RX_DESC	256U	/* Number of Rx descriptor registers */
+#define NUM_RX_DESC	256	/* Number of Rx descriptor registers */
 #define R8169_TX_RING_BYTES	(NUM_TX_DESC * sizeof(struct TxDesc))
 #define R8169_RX_RING_BYTES	(NUM_RX_DESC * sizeof(struct RxDesc))
 
@@ -3844,7 +3844,7 @@ static struct page *rtl8169_alloc_rx_data(struct rtl8169_private *tp,
 
 static void rtl8169_rx_clear(struct rtl8169_private *tp)
 {
-	unsigned int i;
+	int i;
 
 	for (i = 0; i < NUM_RX_DESC && tp->Rx_databuff[i]; i++) {
 		dma_unmap_page(tp_to_dev(tp),
@@ -3859,7 +3859,7 @@ static void rtl8169_rx_clear(struct rtl8169_private *tp)
 
 static int rtl8169_rx_fill(struct rtl8169_private *tp)
 {
-	unsigned int i;
+	int i;
 
 	for (i = 0; i < NUM_RX_DESC; i++) {
 		struct page *data;
@@ -4415,15 +4415,13 @@ static inline void rtl8169_rx_csum(struct sk_buff *skb, u32 opts1)
 		skb_checksum_none_assert(skb);
 }
 
-static int rtl_rx(struct net_device *dev, struct rtl8169_private *tp, u32 budget)
+static int rtl_rx(struct net_device *dev, struct rtl8169_private *tp, int budget)
 {
-	unsigned int cur_rx, rx_left, count;
 	struct device *d = tp_to_dev(tp);
+	int count;
 
-	cur_rx = tp->cur_rx;
-
-	for (rx_left = min(budget, NUM_RX_DESC); rx_left > 0; rx_left--, cur_rx++) {
-		unsigned int pkt_size, entry = cur_rx % NUM_RX_DESC;
+	for (count = 0; count < budget; count++, tp->cur_rx++) {
+		unsigned int pkt_size, entry = tp->cur_rx % NUM_RX_DESC;
 		struct RxDesc *desc = tp->RxDescArray + entry;
 		struct sk_buff *skb;
 		const void *rx_buf;
@@ -4500,9 +4498,6 @@ static int rtl_rx(struct net_device *dev, struct rtl8169_private *tp, u32 budget
 		rtl8169_mark_to_asic(desc);
 	}
 
-	count = cur_rx - tp->cur_rx;
-	tp->cur_rx = cur_rx;
-
 	return count;
 }
 
@@ -4561,7 +4556,7 @@ static int rtl8169_poll(struct napi_struct *napi, int budget)
 	struct net_device *dev = tp->dev;
 	int work_done;
 
-	work_done = rtl_rx(dev, tp, (u32) budget);
+	work_done = rtl_rx(dev, tp, budget);
 
 	rtl_tx(dev, tp, budget);