Merge branch 'mvneta-ethtool-stats'

Russell King says:

====================
mvneta ethtool statistics

Sorry for v3 - I forgot to update the commit message on patch 1 as
requested by Marcin.

This short series adds ethtool statistics reporting to mvneta.  Having
discussed with Andrew on IRC, we decided I'd pick up his patch into my
series.

My change for patch 1 compared to the previous RFC splits out the
reading of the statistics from the hardware into a separate function,
in order to facilitate work going on elsewhere to arrange for the
statistics to be preserved across a suspend/resume cycle.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvneta.c

@@ -101,6 +101,8 @@
 #define MVNETA_TXQ_CMD                           0x2448
 #define      MVNETA_TXQ_DISABLE_SHIFT            8
 #define      MVNETA_TXQ_ENABLE_MASK              0x000000ff
+#define MVNETA_RX_DISCARD_FRAME_COUNT		 0x2484
+#define MVNETA_OVERRUN_FRAME_COUNT		 0x2488
 #define MVNETA_GMAC_CLOCK_DIVIDER                0x24f4
 #define      MVNETA_GMAC_1MS_CLOCK_ENABLE        BIT(31)
 #define MVNETA_ACC_MODE                          0x2500
@@ -192,7 +194,7 @@
 #define      MVNETA_GMAC_AN_FLOW_CTRL_EN         BIT(11)
 #define      MVNETA_GMAC_CONFIG_FULL_DUPLEX      BIT(12)
 #define      MVNETA_GMAC_AN_DUPLEX_EN            BIT(13)
-#define MVNETA_MIB_COUNTERS_BASE                 0x3080
+#define MVNETA_MIB_COUNTERS_BASE                 0x3000
 #define      MVNETA_MIB_LATE_COLLISION           0x7c
 #define MVNETA_DA_FILT_SPEC_MCAST                0x3400
 #define MVNETA_DA_FILT_OTH_MCAST                 0x3500
@@ -278,6 +280,50 @@
 
 #define MVNETA_RX_BUF_SIZE(pkt_size)   ((pkt_size) + NET_SKB_PAD)
 
+struct mvneta_statistic {
+	unsigned short offset;
+	unsigned short type;
+	const char name[ETH_GSTRING_LEN];
+};
+
+#define T_REG_32	32
+#define T_REG_64	64
+
+static const struct mvneta_statistic mvneta_statistics[] = {
+	{ 0x3000, T_REG_64, "good_octets_received", },
+	{ 0x3010, T_REG_32, "good_frames_received", },
+	{ 0x3008, T_REG_32, "bad_octets_received", },
+	{ 0x3014, T_REG_32, "bad_frames_received", },
+	{ 0x3018, T_REG_32, "broadcast_frames_received", },
+	{ 0x301c, T_REG_32, "multicast_frames_received", },
+	{ 0x3050, T_REG_32, "unrec_mac_control_received", },
+	{ 0x3058, T_REG_32, "good_fc_received", },
+	{ 0x305c, T_REG_32, "bad_fc_received", },
+	{ 0x3060, T_REG_32, "undersize_received", },
+	{ 0x3064, T_REG_32, "fragments_received", },
+	{ 0x3068, T_REG_32, "oversize_received", },
+	{ 0x306c, T_REG_32, "jabber_received", },
+	{ 0x3070, T_REG_32, "mac_receive_error", },
+	{ 0x3074, T_REG_32, "bad_crc_event", },
+	{ 0x3078, T_REG_32, "collision", },
+	{ 0x307c, T_REG_32, "late_collision", },
+	{ 0x2484, T_REG_32, "rx_discard", },
+	{ 0x2488, T_REG_32, "rx_overrun", },
+	{ 0x3020, T_REG_32, "frames_64_octets", },
+	{ 0x3024, T_REG_32, "frames_65_to_127_octets", },
+	{ 0x3028, T_REG_32, "frames_128_to_255_octets", },
+	{ 0x302c, T_REG_32, "frames_256_to_511_octets", },
+	{ 0x3030, T_REG_32, "frames_512_to_1023_octets", },
+	{ 0x3034, T_REG_32, "frames_1024_to_max_octets", },
+	{ 0x3038, T_REG_64, "good_octets_sent", },
+	{ 0x3040, T_REG_32, "good_frames_sent", },
+	{ 0x3044, T_REG_32, "excessive_collision", },
+	{ 0x3048, T_REG_32, "multicast_frames_sent", },
+	{ 0x304c, T_REG_32, "broadcast_frames_sent", },
+	{ 0x3054, T_REG_32, "fc_sent", },
+	{ 0x300c, T_REG_32, "internal_mac_transmit_err", },
+};
+
 struct mvneta_pcpu_stats {
 	struct	u64_stats_sync syncp;
 	u64	rx_packets;
@@ -324,6 +370,8 @@ struct mvneta_port {
 	unsigned int speed;
 	unsigned int tx_csum_limit;
 	int use_inband_status:1;
+
+	u64 ethtool_stats[ARRAY_SIZE(mvneta_statistics)];
 };
 
 /* The mvneta_tx_desc and mvneta_rx_desc structures describe the
@@ -530,6 +578,8 @@ static void mvneta_mib_counters_clear(struct mvneta_port *pp)
 	/* Perform dummy reads from MIB counters */
 	for (i = 0; i < MVNETA_MIB_LATE_COLLISION; i += 4)
 		dummy = mvreg_read(pp, (MVNETA_MIB_COUNTERS_BASE + i));
+	dummy = mvreg_read(pp, MVNETA_RX_DISCARD_FRAME_COUNT);
+	dummy = mvreg_read(pp, MVNETA_OVERRUN_FRAME_COUNT);
 }
 
 /* Get System Network Statistics */
@@ -758,7 +808,6 @@ static void mvneta_port_up(struct mvneta_port *pp)
 	u32 q_map;
 
 	/* Enable all initialized TXs. */
-	mvneta_mib_counters_clear(pp);
 	q_map = 0;
 	for (queue = 0; queue < txq_number; queue++) {
 		struct mvneta_tx_queue *txq = &pp->txqs[queue];
@@ -1035,6 +1084,8 @@ static void mvneta_defaults_set(struct mvneta_port *pp)
 	mvreg_write(pp, MVNETA_INTR_ENABLE,
 		    (MVNETA_RXQ_INTR_ENABLE_ALL_MASK
 		     | MVNETA_TXQ_INTR_ENABLE_ALL_MASK));
+
+	mvneta_mib_counters_clear(pp);
 }
 
 /* Set max sizes for tx queues */
@@ -2982,6 +3033,65 @@ static int mvneta_ethtool_set_ringparam(struct net_device *dev,
 	return 0;
 }
 
+static void mvneta_ethtool_get_strings(struct net_device *netdev, u32 sset,
+				       u8 *data)
+{
+	if (sset == ETH_SS_STATS) {
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(mvneta_statistics); i++)
+			memcpy(data + i * ETH_GSTRING_LEN,
+			       mvneta_statistics[i].name, ETH_GSTRING_LEN);
+	}
+}
+
+static void mvneta_ethtool_update_stats(struct mvneta_port *pp)
+{
+	const struct mvneta_statistic *s;
+	void __iomem *base = pp->base;
+	u32 high, low, val;
+	int i;
+
+	for (i = 0, s = mvneta_statistics;
+	     s < mvneta_statistics + ARRAY_SIZE(mvneta_statistics);
+	     s++, i++) {
+		val = 0;
+
+		switch (s->type) {
+		case T_REG_32:
+			val = readl_relaxed(base + s->offset);
+			break;
+		case T_REG_64:
+			/* Docs say to read low 32-bit then high */
+			low = readl_relaxed(base + s->offset);
+			high = readl_relaxed(base + s->offset + 4);
+			val = (u64)high << 32 | low;
+			break;
+		}
+
+		pp->ethtool_stats[i] += val;
+	}
+}
+
+static void mvneta_ethtool_get_stats(struct net_device *dev,
+				     struct ethtool_stats *stats, u64 *data)
+{
+	struct mvneta_port *pp = netdev_priv(dev);
+	int i;
+
+	mvneta_ethtool_update_stats(pp);
+
+	for (i = 0; i < ARRAY_SIZE(mvneta_statistics); i++)
+		*data++ = pp->ethtool_stats[i];
+}
+
+static int mvneta_ethtool_get_sset_count(struct net_device *dev, int sset)
+{
+	if (sset == ETH_SS_STATS)
+		return ARRAY_SIZE(mvneta_statistics);
+	return -EOPNOTSUPP;
+}
+
 static const struct net_device_ops mvneta_netdev_ops = {
 	.ndo_open            = mvneta_open,
 	.ndo_stop            = mvneta_stop,
@@ -3003,6 +3113,9 @@ const struct ethtool_ops mvneta_eth_tool_ops = {
 	.get_drvinfo    = mvneta_ethtool_get_drvinfo,
 	.get_ringparam  = mvneta_ethtool_get_ringparam,
 	.set_ringparam	= mvneta_ethtool_set_ringparam,
+	.get_strings	= mvneta_ethtool_get_strings,
+	.get_ethtool_stats = mvneta_ethtool_get_stats,
+	.get_sset_count	= mvneta_ethtool_get_sset_count,
 };
 
 /* Initialize hw */