[PATCH net-next v3 0/9] forcedeth: stats & debug enhancements

@@ -609,7 +609,7 @@ struct nv_ethtool_str {
 };
 
 static const struct nv_ethtool_str nv_estats_str[] = {
-	{ "tx_bytes" },
+	{ "tx_bytes" }, /* includes Ethernet FCS CRC */
 	{ "tx_zero_rexmt" },
 	{ "tx_one_rexmt" },
 	{ "tx_many_rexmt" },

@@ -637,7 +637,7 @@ static const struct nv_ethtool_str nv_estats_str[] = {
 	/* version 2 stats */
 	{ "tx_deferral" },
 	{ "tx_packets" },
-	{ "rx_bytes" },
+	{ "rx_bytes" }, /* includes Ethernet FCS CRC */
 	{ "tx_pause" },
 	{ "rx_pause" },
 	{ "rx_drop_frame" },

@@ -649,7 +649,7 @@ static const struct nv_ethtool_str nv_estats_str[] = {
 };
 
 struct nv_ethtool_stats {
-	u64 tx_bytes;
+	u64 tx_bytes; /* should be ifconfig->tx_bytes + 4*tx_packets */
 	u64 tx_zero_rexmt;
 	u64 tx_one_rexmt;
 	u64 tx_many_rexmt;

@@ -670,14 +670,14 @@ struct nv_ethtool_stats {
 	u64 rx_unicast;
 	u64 rx_multicast;
 	u64 rx_broadcast;
-	u64 rx_packets;
+	u64 rx_packets; /* should be ifconfig->rx_packets */
 	u64 rx_errors_total;
 	u64 tx_errors_total;
 
 	/* version 2 stats */
 	u64 tx_deferral;
-	u64 tx_packets;
-	u64 rx_bytes;
+	u64 tx_packets; /* should be ifconfig->tx_packets */
+	u64 rx_bytes;   /* should be ifconfig->rx_bytes + 4*rx_packets */
 	u64 tx_pause;
 	u64 rx_pause;
 	u64 rx_drop_frame;

@@ -1706,10 +1706,17 @@ static struct net_device_stats *nv_get_stats(struct net_device *dev)
 	if (np->driver_data & (DEV_HAS_STATISTICS_V1|DEV_HAS_STATISTICS_V2|DEV_HAS_STATISTICS_V3)) {
 		nv_get_hw_stats(dev);
 
+		/*
+		 * Note: because HW stats are not always available and
+		 * for consistency reasons, the following ifconfig
+		 * stats are managed by software: rx_bytes, tx_bytes,
+		 * rx_packets and tx_packets. The related hardware
+		 * stats reported by ethtool should be equivalent to
+		 * these ifconfig stats, with 4 additional bytes per
+		 * packet (Ethernet FCS CRC).
+		 */
+
 		/* copy to net_device stats */
-		dev->stats.tx_packets = np->estats.tx_packets;
-		dev->stats.rx_bytes = np->estats.rx_bytes;
-		dev->stats.tx_bytes = np->estats.tx_bytes;
 		dev->stats.tx_fifo_errors = np->estats.tx_fifo_errors;
 		dev->stats.tx_carrier_errors = np->estats.tx_carrier_errors;
 		dev->stats.rx_crc_errors = np->estats.rx_crc_errors;

@@ -2380,6 +2387,9 @@ static int nv_tx_done(struct net_device *dev, int limit)
 				if (flags & NV_TX_ERROR) {
 					if ((flags & NV_TX_RETRYERROR) && !(flags & NV_TX_RETRYCOUNT_MASK))
 						nv_legacybackoff_reseed(dev);
+				} else {
+					dev->stats.tx_packets++;
+					dev->stats.tx_bytes += np->get_tx_ctx->skb->len;
 				}
 				dev_kfree_skb_any(np->get_tx_ctx->skb);
 				np->get_tx_ctx->skb = NULL;

@@ -2390,6 +2400,9 @@ static int nv_tx_done(struct net_device *dev, int limit)
 				if (flags & NV_TX2_ERROR) {
 					if ((flags & NV_TX2_RETRYERROR) && !(flags & NV_TX2_RETRYCOUNT_MASK))
 						nv_legacybackoff_reseed(dev);
+				} else {
+					dev->stats.tx_packets++;
+					dev->stats.tx_bytes += np->get_tx_ctx->skb->len;
 				}
 				dev_kfree_skb_any(np->get_tx_ctx->skb);
 				np->get_tx_ctx->skb = NULL;

@@ -2429,6 +2442,9 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
 					else
 						nv_legacybackoff_reseed(dev);
 				}
+			} else {
+				dev->stats.tx_packets++;
+				dev->stats.tx_bytes += np->get_tx_ctx->skb->len;
 			}
 
 			dev_kfree_skb_any(np->get_tx_ctx->skb);

@@ -2678,6 +2694,7 @@ static int nv_rx_process(struct net_device *dev, int limit)
 		skb->protocol = eth_type_trans(skb, dev);
 		napi_gro_receive(&np->napi, skb);
 		dev->stats.rx_packets++;
+		dev->stats.rx_bytes += len;
 next_pkt:
 		if (unlikely(np->get_rx.orig++ == np->last_rx.orig))
 			np->get_rx.orig = np->first_rx.orig;

@@ -2761,6 +2778,7 @@ static int nv_rx_process_optimized(struct net_device *dev, int limit)
 			}
 			napi_gro_receive(&np->napi, skb);
 			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += len;
 		} else {
 			dev_kfree_skb(skb);
 		}

@@ -633,6 +633,7 @@ static const struct nv_ethtool_str nv_estats_str[] = {
 	{ "rx_packets" },
 	{ "rx_errors_total" },
 	{ "tx_errors_total" },
+	{ "tx_timeout" },
 
 	/* version 2 stats */
 	{ "tx_deferral" },

@@ -673,6 +674,7 @@ struct nv_ethtool_stats {
 	u64 rx_packets; /* should be ifconfig->rx_packets */
 	u64 rx_errors_total;
 	u64 tx_errors_total;
+	u64 tx_timeout;
 
 	/* version 2 stats */
 	u64 tx_deferral;

@@ -852,6 +854,7 @@ struct fe_priv {
 	struct nv_driver_stat stat_tx_packets; /* not always available in HW */
 	struct nv_driver_stat stat_tx_bytes;
 	struct nv_driver_stat stat_tx_dropped;
+	atomic_t stat_tx_timeout;  /* TX timeouts since last nv_update_stats */
 
 	/* msi/msi-x fields */
 	u32 msi_flags;

@@ -1746,6 +1749,7 @@ static void nv_update_stats(struct net_device *dev)
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_packets);
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_bytes);
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_dropped);
+	np->estats.tx_timeout += atomic_xchg(&np->stat_tx_timeout, 0);
 }
 
 /*

@@ -2639,6 +2643,8 @@ static void nv_tx_timeout(struct net_device *dev)
 		}
 	}
 
+	atomic_inc(&np->stat_tx_timeout);
+
 	spin_lock_irq(&np->lock);
 
 	/* 1) stop tx engine */

@@ -824,6 +824,7 @@ struct fe_priv {
 	struct nv_driver_stat stat_rx_packets;
 	struct nv_driver_stat stat_rx_bytes; /* not always available in HW */
 	struct nv_driver_stat stat_rx_missed_errors;
+	struct nv_driver_stat stat_rx_dropped;
 
 	/* media detection workaround.
 	 * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);

@@ -1740,6 +1741,7 @@ static void nv_update_stats(struct net_device *dev)
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_rx_packets);
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_rx_bytes);
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_rx_missed_errors);
+	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_rx_dropped);
 
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_packets);
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_bytes);

@@ -1786,6 +1788,8 @@ nv_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *storage)
 			&np->stat_tx_bytes);
 		storage->rx_errors  = np->estats.rx_errors_total;
 		storage->tx_errors  = np->estats.tx_errors_total;
+		storage->rx_dropped = NV_DRIVER_STAT_GET_TOTAL(
+			&np->stat_rx_dropped);
 		storage->tx_dropped = NV_DRIVER_STAT_GET_TOTAL(
 			&np->stat_tx_dropped);
 

@@ -1841,8 +1845,10 @@ static int nv_alloc_rx(struct net_device *dev)
 				np->put_rx.orig = np->first_rx.orig;
 			if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
 				np->put_rx_ctx = np->first_rx_ctx;
-		} else
+		} else {
+			NV_DRIVER_STAT_ATOMIC_INC(&np->stat_rx_dropped);
 			return 1;
+		}
 	}
 	return 0;
 }

@@ -1873,8 +1879,10 @@ static int nv_alloc_rx_optimized(struct net_device *dev)
 				np->put_rx.ex = np->first_rx.ex;
 			if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
 				np->put_rx_ctx = np->first_rx_ctx;
-		} else
+		} else {
+			NV_DRIVER_STAT_ATOMIC_INC(&np->stat_rx_dropped);
 			return 1;
+		}
 	}
 	return 0;
 }

@@ -65,7 +65,7 @@
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/prefetch.h>
-#include  <linux/io.h>
+#include <linux/io.h>
 
 #include <asm/irq.h>
 #include <asm/system.h>

@@ -892,6 +892,11 @@ enum {
 static int dma_64bit = NV_DMA_64BIT_ENABLED;
 
 /*
+ * Debug output control for tx_timeout
+ */
+static bool debug_tx_timeout = false;
+
+/*
  * Crossover Detection
  * Realtek 8201 phy + some OEM boards do not work properly.
  */

@@ -2477,56 +2482,64 @@ static void nv_tx_timeout(struct net_device *dev)
 	u32 status;
 	union ring_type put_tx;
 	int saved_tx_limit;
-	int i;
 
 	if (np->msi_flags & NV_MSI_X_ENABLED)
 		status = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
 	else
 		status = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
 
-	netdev_info(dev, "Got tx_timeout. irq: %08x\n", status);
+	netdev_warn(dev, "Got tx_timeout. irq status: %08x\n", status);
 
-	netdev_info(dev, "Ring at %lx\n", (unsigned long)np->ring_addr);
-	netdev_info(dev, "Dumping tx registers\n");
-	for (i = 0; i <= np->register_size; i += 32) {
-		netdev_info(dev,
-			    "%3x: %08x %08x %08x %08x %08x %08x %08x %08x\n",
-			    i,
-			    readl(base + i + 0), readl(base + i + 4),
-			    readl(base + i + 8), readl(base + i + 12),
-			    readl(base + i + 16), readl(base + i + 20),
-			    readl(base + i + 24), readl(base + i + 28));
-	}
-	netdev_info(dev, "Dumping tx ring\n");
-	for (i = 0; i < np->tx_ring_size; i += 4) {
-		if (!nv_optimized(np)) {
-			netdev_info(dev,
-				    "%03x: %08x %08x // %08x %08x // %08x %08x // %08x %08x\n",
-				    i,
-				    le32_to_cpu(np->tx_ring.orig[i].buf),
-				    le32_to_cpu(np->tx_ring.orig[i].flaglen),
-				    le32_to_cpu(np->tx_ring.orig[i+1].buf),
-				    le32_to_cpu(np->tx_ring.orig[i+1].flaglen),
-				    le32_to_cpu(np->tx_ring.orig[i+2].buf),
-				    le32_to_cpu(np->tx_ring.orig[i+2].flaglen),
-				    le32_to_cpu(np->tx_ring.orig[i+3].buf),
-				    le32_to_cpu(np->tx_ring.orig[i+3].flaglen));
-		} else {
+	if (unlikely(debug_tx_timeout)) {
+		int i;
+
+		netdev_info(dev, "Ring at %lx\n", (unsigned long)np->ring_addr);
+		netdev_info(dev, "Dumping tx registers\n");
+		for (i = 0; i <= np->register_size; i += 32) {
 			netdev_info(dev,
-				    "%03x: %08x %08x %08x // %08x %08x %08x // %08x %08x %08x // %08x %08x %08x\n",
+				    "%3x: %08x %08x %08x %08x "
+				    "%08x %08x %08x %08x\n",
 				    i,
-				    le32_to_cpu(np->tx_ring.ex[i].bufhigh),
-				    le32_to_cpu(np->tx_ring.ex[i].buflow),
-				    le32_to_cpu(np->tx_ring.ex[i].flaglen),
-				    le32_to_cpu(np->tx_ring.ex[i+1].bufhigh),
-				    le32_to_cpu(np->tx_ring.ex[i+1].buflow),
-				    le32_to_cpu(np->tx_ring.ex[i+1].flaglen),
-				    le32_to_cpu(np->tx_ring.ex[i+2].bufhigh),
-				    le32_to_cpu(np->tx_ring.ex[i+2].buflow),
-				    le32_to_cpu(np->tx_ring.ex[i+2].flaglen),
-				    le32_to_cpu(np->tx_ring.ex[i+3].bufhigh),
-				    le32_to_cpu(np->tx_ring.ex[i+3].buflow),
-				    le32_to_cpu(np->tx_ring.ex[i+3].flaglen));
+				    readl(base + i + 0), readl(base + i + 4),
+				    readl(base + i + 8), readl(base + i + 12),
+				    readl(base + i + 16), readl(base + i + 20),
+				    readl(base + i + 24), readl(base + i + 28));
+		}
+		netdev_info(dev, "Dumping tx ring\n");
+		for (i = 0; i < np->tx_ring_size; i += 4) {
+			if (!nv_optimized(np)) {
+				netdev_info(dev,
+					    "%03x: %08x %08x // %08x %08x "
+					    "// %08x %08x // %08x %08x\n",
+					    i,
+					    le32_to_cpu(np->tx_ring.orig[i].buf),
+					    le32_to_cpu(np->tx_ring.orig[i].flaglen),
+					    le32_to_cpu(np->tx_ring.orig[i+1].buf),
+					    le32_to_cpu(np->tx_ring.orig[i+1].flaglen),
+					    le32_to_cpu(np->tx_ring.orig[i+2].buf),
+					    le32_to_cpu(np->tx_ring.orig[i+2].flaglen),
+					    le32_to_cpu(np->tx_ring.orig[i+3].buf),
+					    le32_to_cpu(np->tx_ring.orig[i+3].flaglen));
+			} else {
+				netdev_info(dev,
+					    "%03x: %08x %08x %08x "
+					    "// %08x %08x %08x "
+					    "// %08x %08x %08x "
+					    "// %08x %08x %08x\n",
+					    i,
+					    le32_to_cpu(np->tx_ring.ex[i].bufhigh),
+					    le32_to_cpu(np->tx_ring.ex[i].buflow),
+					    le32_to_cpu(np->tx_ring.ex[i].flaglen),
+					    le32_to_cpu(np->tx_ring.ex[i+1].bufhigh),
+					    le32_to_cpu(np->tx_ring.ex[i+1].buflow),
+					    le32_to_cpu(np->tx_ring.ex[i+1].flaglen),
+					    le32_to_cpu(np->tx_ring.ex[i+2].bufhigh),
+					    le32_to_cpu(np->tx_ring.ex[i+2].buflow),
+					    le32_to_cpu(np->tx_ring.ex[i+2].flaglen),
+					    le32_to_cpu(np->tx_ring.ex[i+3].bufhigh),
+					    le32_to_cpu(np->tx_ring.ex[i+3].buflow),
+					    le32_to_cpu(np->tx_ring.ex[i+3].flaglen));
+			}
 		}
 	}
 

@@ -6156,6 +6169,9 @@ module_param(phy_cross, int, 0);
 MODULE_PARM_DESC(phy_cross, "Phy crossover detection for Realtek 8201 phy is enabled by setting to 1 and disabled by setting to 0.");
 module_param(phy_power_down, int, 0);
 MODULE_PARM_DESC(phy_power_down, "Power down phy and disable link when interface is down (1), or leave phy powered up (0).");
+module_param(debug_tx_timeout, bool, 0);
+MODULE_PARM_DESC(debug_tx_timeout,
+		 "Dump tx related registers and ring when tx_timeout happens");
 
 MODULE_AUTHOR("Manfred Spraul <manfred@colorfullife.com>");
 MODULE_DESCRIPTION("Reverse Engineered nForce ethernet driver");

@@ -5540,7 +5540,7 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 	init_timer(&np->nic_poll);
 	np->nic_poll.data = (unsigned long) dev;
 	np->nic_poll.function = nv_do_nic_poll;	/* timer handler */
-	init_timer(&np->stats_poll);
+	init_timer_deferrable(&np->stats_poll);
 	np->stats_poll.data = (unsigned long) dev;
 	np->stats_poll.function = nv_do_stats_poll;	/* timer handler */
 

@@ -3810,6 +3810,7 @@ static int nv_request_irq(struct net_device *dev, int intr_test)
 				writel(0, base + NvRegMSIXMap0);
 				writel(0, base + NvRegMSIXMap1);
 			}
+			netdev_info(dev, "MSI-X enabled\n");
 		}
 	}
 	if (ret != 0 && np->msi_flags & NV_MSI_CAPABLE) {

@@ -3831,6 +3832,7 @@ static int nv_request_irq(struct net_device *dev, int intr_test)
 			writel(0, base + NvRegMSIMap1);
 			/* enable msi vector 0 */
 			writel(NVREG_MSI_VECTOR_0_ENABLED, base + NvRegMSIIrqMask);
+			netdev_info(dev, "MSI enabled\n");
 		}
 	}
 	if (ret != 0) {

@@ -6153,23 +6153,23 @@ static void __exit exit_nic(void)
 	pci_unregister_driver(&driver);
 }
 
-module_param(max_interrupt_work, int, 0);
+module_param(max_interrupt_work, int, S_IRUGO);
 MODULE_PARM_DESC(max_interrupt_work, "forcedeth maximum events handled per interrupt");
-module_param(optimization_mode, int, 0);
+module_param(optimization_mode, int, S_IRUGO);
 MODULE_PARM_DESC(optimization_mode, "In throughput mode (0), every tx & rx packet will generate an interrupt. In CPU mode (1), interrupts are controlled by a timer. In dynamic mode (2), the mode toggles between throughput and CPU mode based on network load.");
-module_param(poll_interval, int, 0);
+module_param(poll_interval, int, S_IRUGO);
 MODULE_PARM_DESC(poll_interval, "Interval determines how frequent timer interrupt is generated by [(time_in_micro_secs * 100) / (2^10)]. Min is 0 and Max is 65535.");
-module_param(msi, int, 0);
+module_param(msi, int, S_IRUGO);
 MODULE_PARM_DESC(msi, "MSI interrupts are enabled by setting to 1 and disabled by setting to 0.");
-module_param(msix, int, 0);
+module_param(msix, int, S_IRUGO);
 MODULE_PARM_DESC(msix, "MSIX interrupts are enabled by setting to 1 and disabled by setting to 0.");
-module_param(dma_64bit, int, 0);
+module_param(dma_64bit, int, S_IRUGO);
 MODULE_PARM_DESC(dma_64bit, "High DMA is enabled by setting to 1 and disabled by setting to 0.");
-module_param(phy_cross, int, 0);
+module_param(phy_cross, int, S_IRUGO);
 MODULE_PARM_DESC(phy_cross, "Phy crossover detection for Realtek 8201 phy is enabled by setting to 1 and disabled by setting to 0.");
-module_param(phy_power_down, int, 0);
+module_param(phy_power_down, int, S_IRUGO);
 MODULE_PARM_DESC(phy_power_down, "Power down phy and disable link when interface is down (1), or leave phy powered up (0).");
-module_param(debug_tx_timeout, bool, 0);
+module_param(debug_tx_timeout, bool, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(debug_tx_timeout,
 		 "Dump tx related registers and ring when tx_timeout happens");
 

@@ -692,6 +692,21 @@ struct nv_ethtool_stats {
 #define NV_DEV_STATISTICS_V2_COUNT (NV_DEV_STATISTICS_V3_COUNT - 3)
 #define NV_DEV_STATISTICS_V1_COUNT (NV_DEV_STATISTICS_V2_COUNT - 6)
 
+/* driver statistics */
+struct nv_driver_stat {
+	atomic_t delta;  /* increase since last nv_update_stats() */
+	u64 total;  /* cumulative, requires netdev_priv(dev)->stats_lock */
+};
+
+#define NV_DRIVER_STAT_ATOMIC_INC(ptr_stat) /* atomic */ \
+	({ atomic_inc(&(ptr_stat)->delta); })
+#define NV_DRIVER_STAT_ATOMIC_ADD(ptr_stat,increment) /* atomic */	\
+	({ atomic_add((increment), &(ptr_stat)->delta); })
+#define NV_DRIVER_STAT_UPDATE_TOTAL(ptr_stat) /* requires stats_lock */ \
+	({ (ptr_stat)->total += atomic_xchg(&(ptr_stat)->delta, 0); })
+#define NV_DRIVER_STAT_GET_TOTAL(ptr_stat) /* requires stats_lock */ \
+	((ptr_stat)->total)
+
 /* diagnostics */
 #define NV_TEST_COUNT_BASE 3
 #define NV_TEST_COUNT_EXTENDED 4

@@ -736,6 +751,12 @@ struct nv_skb_map {
  * - tx setup is lockless: it relies on netif_tx_lock. Actual submission
  *	needs netdev_priv(dev)->lock :-(
  * - set_multicast_list: preparation lockless, relies on netif_tx_lock.
+ *
+ * Stats are protected with stats_lock:
+ * - updated by nv_do_stats_poll (timer). This is meant to avoid
+ *   integer wraparound in the NIC stats registers, at low frequency
+ *   (0.1 Hz)
+ * - updated by nv_get_ethtool_stats + nv_get_stats64
  */
 
 /* in dev: base, irq */

@@ -745,9 +766,10 @@ struct fe_priv {
 	struct net_device *dev;
 	struct napi_struct napi;
 
-	/* General data:
-	 * Locking: spin_lock(&np->lock); */
+	/* stats are updated in syscall and timer */
+	spinlock_t stats_lock;
 	struct nv_ethtool_stats estats;
+
 	int in_shutdown;
 	u32 linkspeed;
 	int duplex;

@@ -798,6 +820,11 @@ struct fe_priv {
 	u32 nic_poll_irq;
 	int rx_ring_size;
 
+	/* RX software stats */
+	struct nv_driver_stat stat_rx_packets;
+	struct nv_driver_stat stat_rx_bytes; /* not always available in HW */
+	struct nv_driver_stat stat_rx_missed_errors;
+
 	/* media detection workaround.
 	 * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);
 	 */

@@ -820,6 +847,11 @@ struct fe_priv {
 	struct nv_skb_map *tx_end_flip;
 	int tx_stop;
 
+	/* TX software stats */
+	struct nv_driver_stat stat_tx_packets; /* not always available in HW */
+	struct nv_driver_stat stat_tx_bytes;
+	struct nv_driver_stat stat_tx_dropped;
+
 	/* msi/msi-x fields */
 	u32 msi_flags;
 	struct msix_entry msi_x_entry[NV_MSI_X_MAX_VECTORS];

@@ -1635,11 +1667,19 @@ static void nv_mac_reset(struct net_device *dev)
 	pci_push(base);
 }
 
-static void nv_get_hw_stats(struct net_device *dev)
+/* Caller must appropriately lock netdev_priv(dev)->stats_lock */
+static void nv_update_stats(struct net_device *dev)
 {
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
 
+	/* If it happens that this is run in top-half context, then
+	 * replace the spin_lock of stats_lock with
+	 * spin_lock_irqsave() in calling functions. */
+	WARN_ONCE(in_irq(), "forcedeth: estats spin_lock(_bh) from top-half");
+	assert_spin_locked(&np->stats_lock);
+
+	/* query hardware */
 	np->estats.tx_bytes += readl(base + NvRegTxCnt);
 	np->estats.tx_zero_rexmt += readl(base + NvRegTxZeroReXmt);
 	np->estats.tx_one_rexmt += readl(base + NvRegTxOneReXmt);

@@ -1695,21 +1735,35 @@ static void nv_get_hw_stats(struct net_device *dev)
 		np->estats.tx_multicast += readl(base + NvRegTxMulticast);
 		np->estats.tx_broadcast += readl(base + NvRegTxBroadcast);
 	}
+
+	/* update software stats */
+	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_rx_packets);
+	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_rx_bytes);
+	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_rx_missed_errors);
+
+	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_packets);
+	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_bytes);
+	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_dropped);
 }
 
 /*
- * nv_get_stats: dev->get_stats function
+ * nv_get_stats64: dev->ndo_get_stats64 function
  * Get latest stats value from the nic.
  * Called with read_lock(&dev_base_lock) held for read -
  * only synchronized against unregister_netdevice.
  */
-static struct net_device_stats *nv_get_stats(struct net_device *dev)
+static struct rtnl_link_stats64*
+nv_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *storage)
+	__acquires(&netdev_priv(dev)->stats_lock)
+	__releases(&netdev_priv(dev)->stats_lock)
 {
 	struct fe_priv *np = netdev_priv(dev);
 
 	/* If the nic supports hw counters then retrieve latest values */
-	if (np->driver_data & (DEV_HAS_STATISTICS_V1|DEV_HAS_STATISTICS_V2|DEV_HAS_STATISTICS_V3)) {
-		nv_get_hw_stats(dev);
+	if (np->driver_data & DEV_HAS_STATISTICS_V123) {
+		spin_lock_bh(&np->stats_lock);
+
+		nv_update_stats(dev);
 
 		/*
 		 * Note: because HW stats are not always available and

@@ -1721,17 +1775,40 @@ static struct net_device_stats *nv_get_stats(struct net_device *dev)
 		 * packet (Ethernet FCS CRC).
 		 */
 
-		/* copy to net_device stats */
-		dev->stats.tx_fifo_errors = np->estats.tx_fifo_errors;
-		dev->stats.tx_carrier_errors = np->estats.tx_carrier_errors;
-		dev->stats.rx_crc_errors = np->estats.rx_crc_errors;
-		dev->stats.rx_over_errors = np->estats.rx_over_errors;
-		dev->stats.rx_fifo_errors = np->estats.rx_drop_frame;
-		dev->stats.rx_errors = np->estats.rx_errors_total;
-		dev->stats.tx_errors = np->estats.tx_errors_total;
-	}
-
-	return &dev->stats;
+		/* generic stats */
+		storage->rx_packets = NV_DRIVER_STAT_GET_TOTAL(
+			&np->stat_rx_packets);
+		storage->tx_packets = NV_DRIVER_STAT_GET_TOTAL(
+			&np->stat_tx_packets);
+		storage->rx_bytes   = NV_DRIVER_STAT_GET_TOTAL(
+			&np->stat_rx_bytes);
+		storage->tx_bytes   = NV_DRIVER_STAT_GET_TOTAL(
+			&np->stat_tx_bytes);
+		storage->rx_errors  = np->estats.rx_errors_total;
+		storage->tx_errors  = np->estats.tx_errors_total;
+		storage->tx_dropped = NV_DRIVER_STAT_GET_TOTAL(
+			&np->stat_tx_dropped);
+
+		/* meaningful only when NIC supports stats v3 */
+		storage->multicast  = np->estats.rx_multicast;
+
+		/* detailed rx_errors */
+		storage->rx_length_errors = np->estats.rx_length_error;
+		storage->rx_over_errors   = np->estats.rx_over_errors;
+		storage->rx_crc_errors    = np->estats.rx_crc_errors;
+		storage->rx_frame_errors  = np->estats.rx_frame_align_error;
+		storage->rx_fifo_errors   = np->estats.rx_drop_frame;
+		storage->rx_missed_errors = NV_DRIVER_STAT_GET_TOTAL(
+			&np->stat_rx_missed_errors);
+
+		/* detailed tx_errors */
+		storage->tx_carrier_errors = np->estats.tx_carrier_errors;
+		storage->tx_fifo_errors    = np->estats.tx_fifo_errors;
+
+		spin_unlock_bh(&np->stats_lock);
+	}
+
+	return storage;
 }
 
 /*

@@ -1933,7 +2010,7 @@ static void nv_drain_tx(struct net_device *dev)
 			np->tx_ring.ex[i].buflow = 0;
 		}
 		if (nv_release_txskb(np, &np->tx_skb[i]))
-			dev->stats.tx_dropped++;
+			NV_DRIVER_STAT_ATOMIC_INC(&np->stat_tx_dropped);
 		np->tx_skb[i].dma = 0;
 		np->tx_skb[i].dma_len = 0;
 		np->tx_skb[i].dma_single = 0;

@@ -2390,11 +2467,15 @@ static int nv_tx_done(struct net_device *dev, int limit)
 		if (np->desc_ver == DESC_VER_1) {
 			if (flags & NV_TX_LASTPACKET) {
 				if (flags & NV_TX_ERROR) {
-					if ((flags & NV_TX_RETRYERROR) && !(flags & NV_TX_RETRYCOUNT_MASK))
+					if ((flags & NV_TX_RETRYERROR)
+					    && !(flags & NV_TX_RETRYCOUNT_MASK))
 						nv_legacybackoff_reseed(dev);
 				} else {
-					dev->stats.tx_packets++;
-					dev->stats.tx_bytes += np->get_tx_ctx->skb->len;
+					NV_DRIVER_STAT_ATOMIC_INC(
+						&np->stat_tx_packets);
+					NV_DRIVER_STAT_ATOMIC_ADD(
+						&np->stat_tx_bytes,
+						np->get_tx_ctx->skb->len);
 				}
 				dev_kfree_skb_any(np->get_tx_ctx->skb);
 				np->get_tx_ctx->skb = NULL;

@@ -2403,11 +2484,15 @@ static int nv_tx_done(struct net_device *dev, int limit)
 		} else {
 			if (flags & NV_TX2_LASTPACKET) {
 				if (flags & NV_TX2_ERROR) {
-					if ((flags & NV_TX2_RETRYERROR) && !(flags & NV_TX2_RETRYCOUNT_MASK))
+					if ((flags & NV_TX2_RETRYERROR)
+					    && !(flags & NV_TX2_RETRYCOUNT_MASK))
 						nv_legacybackoff_reseed(dev);
 				} else {
-					dev->stats.tx_packets++;
-					dev->stats.tx_bytes += np->get_tx_ctx->skb->len;
+					NV_DRIVER_STAT_ATOMIC_INC(
+						&np->stat_tx_packets);
+					NV_DRIVER_STAT_ATOMIC_ADD(
+						&np->stat_tx_bytes,
+						np->get_tx_ctx->skb->len);
 				}
 				dev_kfree_skb_any(np->get_tx_ctx->skb);
 				np->get_tx_ctx->skb = NULL;

@@ -2441,15 +2526,18 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
 
 		if (flags & NV_TX2_LASTPACKET) {
 			if (flags & NV_TX2_ERROR) {
-				if ((flags & NV_TX2_RETRYERROR) && !(flags & NV_TX2_RETRYCOUNT_MASK)) {
+				if ((flags & NV_TX2_RETRYERROR)
+				    && !(flags & NV_TX2_RETRYCOUNT_MASK)) {
 					if (np->driver_data & DEV_HAS_GEAR_MODE)
 						nv_gear_backoff_reseed(dev);
 					else
 						nv_legacybackoff_reseed(dev);
 				}
 			} else {
-				dev->stats.tx_packets++;
-				dev->stats.tx_bytes += np->get_tx_ctx->skb->len;
+				NV_DRIVER_STAT_ATOMIC_INC(&np->stat_tx_packets);
+				NV_DRIVER_STAT_ATOMIC_ADD(
+					&np->stat_tx_bytes,
+					np->get_tx_ctx->skb->len);
 			}
 
 			dev_kfree_skb_any(np->get_tx_ctx->skb);

@@ -2663,7 +2751,7 @@ static int nv_rx_process(struct net_device *dev, int limit)
 					/* the rest are hard errors */
 					else {
 						if (flags & NV_RX_MISSEDFRAME)
-							dev->stats.rx_missed_errors++;
+							NV_DRIVER_STAT_ATOMIC_INC(&np->stat_rx_missed_errors);
 						dev_kfree_skb(skb);
 						goto next_pkt;
 					}

@@ -2706,8 +2794,8 @@ static int nv_rx_process(struct net_device *dev, int limit)
 		skb_put(skb, len);
 		skb->protocol = eth_type_trans(skb, dev);
 		napi_gro_receive(&np->napi, skb);
-		dev->stats.rx_packets++;
-		dev->stats.rx_bytes += len;
+		NV_DRIVER_STAT_ATOMIC_INC(&np->stat_rx_packets);
+		NV_DRIVER_STAT_ATOMIC_ADD(&np->stat_rx_bytes, len);
 next_pkt:
 		if (unlikely(np->get_rx.orig++ == np->last_rx.orig))
 			np->get_rx.orig = np->first_rx.orig;

@@ -2790,8 +2878,8 @@ static int nv_rx_process_optimized(struct net_device *dev, int limit)
 				__vlan_hwaccel_put_tag(skb, vid);
 			}
 			napi_gro_receive(&np->napi, skb);
-			dev->stats.rx_packets++;
-			dev->stats.rx_bytes += len;
+			NV_DRIVER_STAT_ATOMIC_INC(&np->stat_rx_packets);
+			NV_DRIVER_STAT_ATOMIC_ADD(&np->stat_rx_bytes, len);
 		} else {
 			dev_kfree_skb(skb);
 		}

@@ -4000,11 +4088,18 @@ static void nv_poll_controller(struct net_device *dev)
 #endif
 
 static void nv_do_stats_poll(unsigned long data)
+	__acquires(&netdev_priv(dev)->stats_lock)
+	__releases(&netdev_priv(dev)->stats_lock)
 {
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 
-	nv_get_hw_stats(dev);
+	/* If lock is currently taken, the stats are being refreshed
+	 * and hence fresh enough */
+	if (spin_trylock(&np->stats_lock)) {
+		nv_update_stats(dev);
+		spin_unlock(&np->stats_lock);
+	}
 
 	if (!np->in_shutdown)
 		mod_timer(&np->stats_poll,

@@ -4711,14 +4806,18 @@ static int nv_get_sset_count(struct net_device *dev, int sset)
 	}
 }
 
-static void nv_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *estats, u64 *buffer)
+static void nv_get_ethtool_stats(struct net_device *dev,
+				 struct ethtool_stats *estats, u64 *buffer)
+	__acquires(&netdev_priv(dev)->stats_lock)
+	__releases(&netdev_priv(dev)->stats_lock)
 {
 	struct fe_priv *np = netdev_priv(dev);
 
-	/* update stats */
-	nv_get_hw_stats(dev);
-
-	memcpy(buffer, &np->estats, nv_get_sset_count(dev, ETH_SS_STATS)*sizeof(u64));
+	spin_lock_bh(&np->stats_lock);
+	nv_update_stats(dev);
+	memcpy(buffer, &np->estats,
+	       nv_get_sset_count(dev, ETH_SS_STATS)*sizeof(u64));
+	spin_unlock_bh(&np->stats_lock);
 }
 
 static int nv_link_test(struct net_device *dev)

@@ -5362,7 +5461,7 @@ static int nv_close(struct net_device *dev)
 static const struct net_device_ops nv_netdev_ops = {
 	.ndo_open		= nv_open,
 	.ndo_stop		= nv_close,
-	.ndo_get_stats		= nv_get_stats,
+	.ndo_get_stats64	= nv_get_stats64,
 	.ndo_start_xmit		= nv_start_xmit,
 	.ndo_tx_timeout		= nv_tx_timeout,
 	.ndo_change_mtu		= nv_change_mtu,

@@ -5379,7 +5478,7 @@ static const struct net_device_ops nv_netdev_ops = {
 static const struct net_device_ops nv_netdev_ops_optimized = {
 	.ndo_open		= nv_open,
 	.ndo_stop		= nv_close,
-	.ndo_get_stats		= nv_get_stats,
+	.ndo_get_stats64	= nv_get_stats64,
 	.ndo_start_xmit		= nv_start_xmit_optimized,
 	.ndo_tx_timeout		= nv_tx_timeout,
 	.ndo_change_mtu		= nv_change_mtu,

@@ -5418,6 +5517,7 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 	np->dev = dev;
 	np->pci_dev = pci_dev;
 	spin_lock_init(&np->lock);
+	spin_lock_init(&np->stats_lock);
 	SET_NETDEV_DEV(dev, &pci_dev->dev);
 
 	init_timer(&np->oom_kick);