fec: Add support for reading RMON registers

Add ethtool operation to read RMON registers.

Tested against net-next on i.MX28.

v2: make conditional on #ifndef CONFIG_M5272

Signed-off-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fec.h

@@ -60,6 +60,61 @@
 #define BM_MIIGSK_CFGR_RMII		0x01
 #define BM_MIIGSK_CFGR_FRCONT_10M	0x40
 
+#define RMON_T_DROP		0x200 /* Count of frames not cntd correctly */
+#define RMON_T_PACKETS		0x204 /* RMON TX packet count */
+#define RMON_T_BC_PKT		0x208 /* RMON TX broadcast pkts */
+#define RMON_T_MC_PKT		0x20C /* RMON TX multicast pkts */
+#define RMON_T_CRC_ALIGN	0x210 /* RMON TX pkts with CRC align err */
+#define RMON_T_UNDERSIZE	0x214 /* RMON TX pkts < 64 bytes, good CRC */
+#define RMON_T_OVERSIZE		0x218 /* RMON TX pkts > MAX_FL bytes good CRC */
+#define RMON_T_FRAG		0x21C /* RMON TX pkts < 64 bytes, bad CRC */
+#define RMON_T_JAB		0x220 /* RMON TX pkts > MAX_FL bytes, bad CRC */
+#define RMON_T_COL		0x224 /* RMON TX collision count */
+#define RMON_T_P64		0x228 /* RMON TX 64 byte pkts */
+#define RMON_T_P65TO127		0x22C /* RMON TX 65 to 127 byte pkts */
+#define RMON_T_P128TO255	0x230 /* RMON TX 128 to 255 byte pkts */
+#define RMON_T_P256TO511	0x234 /* RMON TX 256 to 511 byte pkts */
+#define RMON_T_P512TO1023	0x238 /* RMON TX 512 to 1023 byte pkts */
+#define RMON_T_P1024TO2047	0x23C /* RMON TX 1024 to 2047 byte pkts */
+#define RMON_T_P_GTE2048	0x240 /* RMON TX pkts > 2048 bytes */
+#define RMON_T_OCTETS		0x244 /* RMON TX octets */
+#define IEEE_T_DROP		0x248 /* Count of frames not counted crtly */
+#define IEEE_T_FRAME_OK		0x24C /* Frames tx'd OK */
+#define IEEE_T_1COL		0x250 /* Frames tx'd with single collision */
+#define IEEE_T_MCOL		0x254 /* Frames tx'd with multiple collision */
+#define IEEE_T_DEF		0x258 /* Frames tx'd after deferral delay */
+#define IEEE_T_LCOL		0x25C /* Frames tx'd with late collision */
+#define IEEE_T_EXCOL		0x260 /* Frames tx'd with excesv collisions */
+#define IEEE_T_MACERR		0x264 /* Frames tx'd with TX FIFO underrun */
+#define IEEE_T_CSERR		0x268 /* Frames tx'd with carrier sense err */
+#define IEEE_T_SQE		0x26C /* Frames tx'd with SQE err */
+#define IEEE_T_FDXFC		0x270 /* Flow control pause frames tx'd */
+#define IEEE_T_OCTETS_OK	0x274 /* Octet count for frames tx'd w/o err */
+#define RMON_R_PACKETS		0x284 /* RMON RX packet count */
+#define RMON_R_BC_PKT		0x288 /* RMON RX broadcast pkts */
+#define RMON_R_MC_PKT		0x28C /* RMON RX multicast pkts */
+#define RMON_R_CRC_ALIGN	0x290 /* RMON RX pkts with CRC alignment err */
+#define RMON_R_UNDERSIZE	0x294 /* RMON RX pkts < 64 bytes, good CRC */
+#define RMON_R_OVERSIZE		0x298 /* RMON RX pkts > MAX_FL bytes good CRC */
+#define RMON_R_FRAG		0x29C /* RMON RX pkts < 64 bytes, bad CRC */
+#define RMON_R_JAB		0x2A0 /* RMON RX pkts > MAX_FL bytes, bad CRC */
+#define RMON_R_RESVD_O		0x2A4 /* Reserved */
+#define RMON_R_P64		0x2A8 /* RMON RX 64 byte pkts */
+#define RMON_R_P65TO127		0x2AC /* RMON RX 65 to 127 byte pkts */
+#define RMON_R_P128TO255	0x2B0 /* RMON RX 128 to 255 byte pkts */
+#define RMON_R_P256TO511	0x2B4 /* RMON RX 256 to 511 byte pkts */
+#define RMON_R_P512TO1023	0x2B8 /* RMON RX 512 to 1023 byte pkts */
+#define RMON_R_P1024TO2047	0x2BC /* RMON RX 1024 to 2047 byte pkts */
+#define RMON_R_P_GTE2048	0x2C0 /* RMON RX pkts > 2048 bytes */
+#define RMON_R_OCTETS		0x2C4 /* RMON RX octets */
+#define IEEE_R_DROP		0x2C8 /* Count frames not counted correctly */
+#define IEEE_R_FRAME_OK		0x2CC /* Frames rx'd OK */
+#define IEEE_R_CRC		0x2D0 /* Frames rx'd with CRC err */
+#define IEEE_R_ALIGN		0x2D4 /* Frames rx'd with alignment err */
+#define IEEE_R_MACERR		0x2D8 /* Receive FIFO overflow count */
+#define IEEE_R_FDXFC		0x2DC /* Flow control pause frames rx'd */
+#define IEEE_R_OCTETS_OK	0x2E0 /* Octet cnt for frames rx'd w/o err */
+
 #else
 
 #define FEC_ECNTRL		0x000 /* Ethernet control reg */

drivers/net/ethernet/freescale/fec_main.c

@@ -604,6 +604,14 @@ fec_restart(struct net_device *ndev, int duplex)
 	if (fep->bufdesc_ex)
 		ecntl |= (1 << 4);
 
+#ifndef CONFIG_M5272
+	/* Disable, clear, and enable the MIB */
+	writel(1 << 31, fep->hwp + FEC_MIB_CTRLSTAT);
+	for (i = RMON_T_DROP; i < IEEE_R_OCTETS_OK; i++)
+		writel(0, fep->hwp + i);
+	writel(0, fep->hwp + FEC_MIB_CTRLSTAT);
+#endif
+
 	/* And last, enable the transmit and receive processing */
 	writel(ecntl, fep->hwp + FEC_ECNTRL);
 	writel(0, fep->hwp + FEC_R_DES_ACTIVE);
@@ -1435,6 +1443,107 @@ static int fec_enet_set_pauseparam(struct net_device *ndev,
 	return 0;
 }
 
+#ifndef CONFIG_M5272
+static const struct fec_stat {
+	char name[ETH_GSTRING_LEN];
+	u16 offset;
+} fec_stats[] = {
+	/* RMON TX */
+	{ "tx_dropped", RMON_T_DROP },
+	{ "tx_packets", RMON_T_PACKETS },
+	{ "tx_broadcast", RMON_T_BC_PKT },
+	{ "tx_multicast", RMON_T_MC_PKT },
+	{ "tx_crc_errors", RMON_T_CRC_ALIGN },
+	{ "tx_undersize", RMON_T_UNDERSIZE },
+	{ "tx_oversize", RMON_T_OVERSIZE },
+	{ "tx_fragment", RMON_T_FRAG },
+	{ "tx_jabber", RMON_T_JAB },
+	{ "tx_collision", RMON_T_COL },
+	{ "tx_64byte", RMON_T_P64 },
+	{ "tx_65to127byte", RMON_T_P65TO127 },
+	{ "tx_128to255byte", RMON_T_P128TO255 },
+	{ "tx_256to511byte", RMON_T_P256TO511 },
+	{ "tx_512to1023byte", RMON_T_P512TO1023 },
+	{ "tx_1024to2047byte", RMON_T_P1024TO2047 },
+	{ "tx_GTE2048byte", RMON_T_P_GTE2048 },
+	{ "tx_octets", RMON_T_OCTETS },
+
+	/* IEEE TX */
+	{ "IEEE_tx_drop", IEEE_T_DROP },
+	{ "IEEE_tx_frame_ok", IEEE_T_FRAME_OK },
+	{ "IEEE_tx_1col", IEEE_T_1COL },
+	{ "IEEE_tx_mcol", IEEE_T_MCOL },
+	{ "IEEE_tx_def", IEEE_T_DEF },
+	{ "IEEE_tx_lcol", IEEE_T_LCOL },
+	{ "IEEE_tx_excol", IEEE_T_EXCOL },
+	{ "IEEE_tx_macerr", IEEE_T_MACERR },
+	{ "IEEE_tx_cserr", IEEE_T_CSERR },
+	{ "IEEE_tx_sqe", IEEE_T_SQE },
+	{ "IEEE_tx_fdxfc", IEEE_T_FDXFC },
+	{ "IEEE_tx_octets_ok", IEEE_T_OCTETS_OK },
+
+	/* RMON RX */
+	{ "rx_packets", RMON_R_PACKETS },
+	{ "rx_broadcast", RMON_R_BC_PKT },
+	{ "rx_multicast", RMON_R_MC_PKT },
+	{ "rx_crc_errors", RMON_R_CRC_ALIGN },
+	{ "rx_undersize", RMON_R_UNDERSIZE },
+	{ "rx_oversize", RMON_R_OVERSIZE },
+	{ "rx_fragment", RMON_R_FRAG },
+	{ "rx_jabber", RMON_R_JAB },
+	{ "rx_64byte", RMON_R_P64 },
+	{ "rx_65to127byte", RMON_R_P65TO127 },
+	{ "rx_128to255byte", RMON_R_P128TO255 },
+	{ "rx_256to511byte", RMON_R_P256TO511 },
+	{ "rx_512to1023byte", RMON_R_P512TO1023 },
+	{ "rx_1024to2047byte", RMON_R_P1024TO2047 },
+	{ "rx_GTE2048byte", RMON_R_P_GTE2048 },
+	{ "rx_octets", RMON_R_OCTETS },
+
+	/* IEEE RX */
+	{ "IEEE_rx_drop", IEEE_R_DROP },
+	{ "IEEE_rx_frame_ok", IEEE_R_FRAME_OK },
+	{ "IEEE_rx_crc", IEEE_R_CRC },
+	{ "IEEE_rx_align", IEEE_R_ALIGN },
+	{ "IEEE_rx_macerr", IEEE_R_MACERR },
+	{ "IEEE_rx_fdxfc", IEEE_R_FDXFC },
+	{ "IEEE_rx_octets_ok", IEEE_R_OCTETS_OK },
+};
+
+static void fec_enet_get_ethtool_stats(struct net_device *dev,
+	struct ethtool_stats *stats, u64 *data)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
+		data[i] = readl(fep->hwp + fec_stats[i].offset);
+}
+
+static void fec_enet_get_strings(struct net_device *netdev,
+	u32 stringset, u8 *data)
+{
+	int i;
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
+			memcpy(data + i * ETH_GSTRING_LEN,
+				fec_stats[i].name, ETH_GSTRING_LEN);
+		break;
+	}
+}
+
+static int fec_enet_get_sset_count(struct net_device *dev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return ARRAY_SIZE(fec_stats);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+#endif
+
 static int fec_enet_nway_reset(struct net_device *dev)
 {
 	struct fec_enet_private *fep = netdev_priv(dev);
@@ -1455,6 +1564,11 @@ static const struct ethtool_ops fec_enet_ethtool_ops = {
 	.get_link		= ethtool_op_get_link,
 	.get_ts_info		= fec_enet_get_ts_info,
 	.nway_reset		= fec_enet_nway_reset,
+#ifndef CONFIG_M5272
+	.get_ethtool_stats	= fec_enet_get_ethtool_stats,
+	.get_strings		= fec_enet_get_strings,
+	.get_sset_count		= fec_enet_get_sset_count,
+#endif
 };
 
 static int fec_enet_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)