S2IO: Save/Restore unused buffer mappings in 2/3 buffer mode

diff -Nurp patch1/drivers/net/s2io.c patch2/drivers/net/s2io.c
@@ -84,7 +84,7 @@
 #include "s2io.h"
 #include "s2io-regs.h"
 
-#define DRV_VERSION "2.0.17.1"
+#define DRV_VERSION "2.0.19.1"
 
 /* S2io Driver name & version. */
 static char s2io_driver_name[] = "Neterion";

@@ -2242,6 +2242,7 @@ static int fill_rx_buffers(struct s2io_n
 	struct buffAdd *ba;
 	unsigned long flags;
 	struct RxD_t *first_rxdp = NULL;
+	u64 Buffer0_ptr = 0, Buffer1_ptr = 0;
 
 	mac_control = &nic->mac_control;
 	config = &nic->config;

@@ -2342,7 +2343,14 @@ static int fill_rx_buffers(struct s2io_n
 			 * payload
 			 */
 
+			/* save the buffer pointers to avoid frequent dma mapping */
+			Buffer0_ptr = ((struct RxD3*)rxdp)->Buffer0_ptr;
+			Buffer1_ptr = ((struct RxD3*)rxdp)->Buffer1_ptr;
 			memset(rxdp, 0, sizeof(struct RxD3));
+			/* restore the buffer pointers for dma sync*/
+			((struct RxD3*)rxdp)->Buffer0_ptr = Buffer0_ptr;
+			((struct RxD3*)rxdp)->Buffer1_ptr = Buffer1_ptr;
+
 			ba = &mac_control->rings[ring_no].ba[block_no][off];
 			skb_reserve(skb, BUF0_LEN);
 			tmp = (u64)(unsigned long) skb->data;

@@ -3307,6 +3315,7 @@ static void s2io_reset(struct s2io_nic *
 	u16 subid, pci_cmd;
 	int i;
 	u16 val16;
+	unsigned long long reset_cnt = 0;
 	DBG_PRINT(INIT_DBG,"%s - Resetting XFrame card %s\n",
 			__FUNCTION__, sp->dev->name);
 

@@ -3372,6 +3381,11 @@ new_way:
 
 	/* Reset device statistics maintained by OS */
 	memset(&sp->stats, 0, sizeof (struct net_device_stats));
+	/* save reset count */
+	reset_cnt = sp->mac_control.stats_info->sw_stat.soft_reset_cnt;
+	memset(sp->mac_control.stats_info, 0, sizeof(struct stat_block));
+	/* restore reset count */
+	sp->mac_control.stats_info->sw_stat.soft_reset_cnt = reset_cnt;
 
 	/* SXE-002: Configure link and activity LED to turn it off */
 	subid = sp->pdev->subsystem_device;

@@ -4279,9 +4293,7 @@ static void s2io_updt_stats(struct s2io_
 			if (cnt == 5)
 				break; /* Updt failed */
 		} while(1);
-	} else {
-		memset(sp->mac_control.stats_info, 0, sizeof(struct stat_block));
-	}
+	} 
 }
 
 /**