octeon_ep_vf: add ethtool support

Add support for the following ethtool commands:

ethtool -i|--driver devname
ethtool devname
ethtool -S|--statistics devname
Signed-off-by: Shinas Rasheed <srasheed@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeon_ep_vf/Makefile

@@ -6,4 +6,5 @@
 obj-$(CONFIG_OCTEON_EP_VF) += octeon_ep_vf.o
 
 octeon_ep_vf-y := octep_vf_main.o octep_vf_cn9k.o octep_vf_cnxk.o \
-		  octep_vf_tx.o octep_vf_rx.o octep_vf_mbox.o
+		  octep_vf_tx.o octep_vf_rx.o octep_vf_mbox.o \
+		  octep_vf_ethtool.o

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_ethtool.c

+// SPDX-License-Identifier: GPL-2.0
+/* Marvell Octeon EP (EndPoint) VF Ethernet Driver
+ *
+ * Copyright (C) 2020 Marvell.
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+
+#include "octep_vf_config.h"
+#include "octep_vf_main.h"
+
+static const char octep_vf_gstrings_global_stats[][ETH_GSTRING_LEN] = {
+	"rx_packets",
+	"tx_packets",
+	"rx_bytes",
+	"tx_bytes",
+	"rx_alloc_errors",
+	"tx_busy_errors",
+	"rx_dropped",
+	"tx_dropped",
+	"tx_hw_pkts",
+	"tx_hw_octs",
+	"tx_hw_bcast",
+	"tx_hw_mcast",
+	"rx_hw_pkts",
+	"rx_hw_bytes",
+	"rx_hw_bcast",
+	"rx_hw_mcast",
+	"rx_dropped_pkts_fifo_full",
+	"rx_dropped_bytes_fifo_full",
+	"rx_err_pkts",
+};
+
+#define OCTEP_VF_GLOBAL_STATS_CNT (sizeof(octep_vf_gstrings_global_stats) / ETH_GSTRING_LEN)
+
+static const char octep_vf_gstrings_tx_q_stats[][ETH_GSTRING_LEN] = {
+	"tx_packets_posted[Q-%u]",
+	"tx_packets_completed[Q-%u]",
+	"tx_bytes[Q-%u]",
+	"tx_busy[Q-%u]",
+};
+
+#define OCTEP_VF_TX_Q_STATS_CNT (sizeof(octep_vf_gstrings_tx_q_stats) / ETH_GSTRING_LEN)
+
+static const char octep_vf_gstrings_rx_q_stats[][ETH_GSTRING_LEN] = {
+	"rx_packets[Q-%u]",
+	"rx_bytes[Q-%u]",
+	"rx_alloc_errors[Q-%u]",
+};
+
+#define OCTEP_VF_RX_Q_STATS_CNT (sizeof(octep_vf_gstrings_rx_q_stats) / ETH_GSTRING_LEN)
+
+static void octep_vf_get_drvinfo(struct net_device *netdev,
+				 struct ethtool_drvinfo *info)
+{
+	struct octep_vf_device *oct = netdev_priv(netdev);
+
+	strscpy(info->driver, OCTEP_VF_DRV_NAME, sizeof(info->driver));
+	strscpy(info->bus_info, pci_name(oct->pdev), sizeof(info->bus_info));
+}
+
+static void octep_vf_get_strings(struct net_device *netdev,
+				 u32 stringset, u8 *data)
+{
+	struct octep_vf_device *oct = netdev_priv(netdev);
+	u16 num_queues = CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf);
+	char *strings = (char *)data;
+	int i, j;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < OCTEP_VF_GLOBAL_STATS_CNT; i++) {
+			snprintf(strings, ETH_GSTRING_LEN,
+				 octep_vf_gstrings_global_stats[i]);
+			strings += ETH_GSTRING_LEN;
+		}
+
+		for (i = 0; i < num_queues; i++) {
+			for (j = 0; j < OCTEP_VF_TX_Q_STATS_CNT; j++) {
+				snprintf(strings, ETH_GSTRING_LEN,
+					 octep_vf_gstrings_tx_q_stats[j], i);
+				strings += ETH_GSTRING_LEN;
+			}
+		}
+
+		for (i = 0; i < num_queues; i++) {
+			for (j = 0; j < OCTEP_VF_RX_Q_STATS_CNT; j++) {
+				snprintf(strings, ETH_GSTRING_LEN,
+					 octep_vf_gstrings_rx_q_stats[j], i);
+				strings += ETH_GSTRING_LEN;
+			}
+		}
+		break;
+	default:
+		break;
+	}
+}
+
+static int octep_vf_get_sset_count(struct net_device *netdev, int sset)
+{
+	struct octep_vf_device *oct = netdev_priv(netdev);
+	u16 num_queues = CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf);
+
+	switch (sset) {
+	case ETH_SS_STATS:
+		return OCTEP_VF_GLOBAL_STATS_CNT + (num_queues *
+		       (OCTEP_VF_TX_Q_STATS_CNT + OCTEP_VF_RX_Q_STATS_CNT));
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void octep_vf_get_ethtool_stats(struct net_device *netdev,
+				       struct ethtool_stats *stats, u64 *data)
+{
+	struct octep_vf_device *oct = netdev_priv(netdev);
+	struct octep_vf_iface_tx_stats *iface_tx_stats;
+	struct octep_vf_iface_rx_stats *iface_rx_stats;
+	u64 rx_alloc_errors, tx_busy_errors;
+	u64 rx_packets, rx_bytes;
+	u64 tx_packets, tx_bytes;
+	int q, i;
+
+	rx_packets = 0;
+	rx_bytes = 0;
+	tx_packets = 0;
+	tx_bytes = 0;
+	rx_alloc_errors = 0;
+	tx_busy_errors = 0;
+	tx_packets = 0;
+	tx_bytes = 0;
+	rx_packets = 0;
+	rx_bytes = 0;
+
+	octep_vf_get_if_stats(oct);
+	iface_tx_stats = &oct->iface_tx_stats;
+	iface_rx_stats = &oct->iface_rx_stats;
+
+	for (q = 0; q < oct->num_oqs; q++) {
+		struct octep_vf_iq *iq = oct->iq[q];
+		struct octep_vf_oq *oq = oct->oq[q];
+
+		tx_packets += iq->stats.instr_completed;
+		tx_bytes += iq->stats.bytes_sent;
+		tx_busy_errors += iq->stats.tx_busy;
+
+		rx_packets += oq->stats.packets;
+		rx_bytes += oq->stats.bytes;
+		rx_alloc_errors += oq->stats.alloc_failures;
+	}
+	i = 0;
+	data[i++] = rx_packets;
+	data[i++] = tx_packets;
+	data[i++] = rx_bytes;
+	data[i++] = tx_bytes;
+	data[i++] = rx_alloc_errors;
+	data[i++] = tx_busy_errors;
+	data[i++] = iface_rx_stats->dropped_pkts_fifo_full +
+		    iface_rx_stats->err_pkts;
+	data[i++] = iface_tx_stats->dropped;
+	data[i++] = iface_tx_stats->pkts;
+	data[i++] = iface_tx_stats->octs;
+	data[i++] = iface_tx_stats->bcst;
+	data[i++] = iface_tx_stats->mcst;
+	data[i++] = iface_rx_stats->pkts;
+	data[i++] = iface_rx_stats->octets;
+	data[i++] = iface_rx_stats->mcast_pkts;
+	data[i++] = iface_rx_stats->bcast_pkts;
+	data[i++] = iface_rx_stats->dropped_pkts_fifo_full;
+	data[i++] = iface_rx_stats->dropped_octets_fifo_full;
+	data[i++] = iface_rx_stats->err_pkts;
+
+	/* Per Tx Queue stats */
+	for (q = 0; q < oct->num_iqs; q++) {
+		struct octep_vf_iq *iq = oct->iq[q];
+
+		data[i++] = iq->stats.instr_posted;
+		data[i++] = iq->stats.instr_completed;
+		data[i++] = iq->stats.bytes_sent;
+		data[i++] = iq->stats.tx_busy;
+	}
+
+	/* Per Rx Queue stats */
+	for (q = 0; q < oct->num_oqs; q++) {
+		struct octep_vf_oq *oq = oct->oq[q];
+
+		data[i++] = oq->stats.packets;
+		data[i++] = oq->stats.bytes;
+		data[i++] = oq->stats.alloc_failures;
+	}
+}
+
+#define OCTEP_VF_SET_ETHTOOL_LINK_MODES_BITMAP(octep_vf_speeds, ksettings, name) \
+{ \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_10GBASE_T)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 10000baseT_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_10GBASE_R)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 10000baseR_FEC); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_10GBASE_CR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 10000baseCR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_10GBASE_KR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 10000baseKR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_10GBASE_LR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 10000baseLR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_10GBASE_SR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 10000baseSR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_25GBASE_CR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 25000baseCR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_25GBASE_KR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 25000baseKR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_25GBASE_SR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 25000baseSR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_40GBASE_CR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 40000baseCR4_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_40GBASE_KR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 40000baseKR4_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_40GBASE_LR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 40000baseLR4_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_40GBASE_SR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 40000baseSR4_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_50GBASE_CR2)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 50000baseCR2_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_50GBASE_KR2)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 50000baseKR2_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_50GBASE_SR2)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 50000baseSR2_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_50GBASE_CR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 50000baseCR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_50GBASE_KR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 50000baseKR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_50GBASE_LR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 50000baseLR_ER_FR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_50GBASE_SR)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 50000baseSR_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_100GBASE_CR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 100000baseCR4_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_100GBASE_KR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 100000baseKR4_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_100GBASE_LR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 100000baseLR4_ER4_Full); \
+	if ((octep_vf_speeds) & BIT(OCTEP_VF_LINK_MODE_100GBASE_SR4)) \
+		ethtool_link_ksettings_add_link_mode(ksettings, name, 100000baseSR4_Full); \
+}
+
+static int octep_vf_get_link_ksettings(struct net_device *netdev,
+				       struct ethtool_link_ksettings *cmd)
+{
+	struct octep_vf_device *oct = netdev_priv(netdev);
+	struct octep_vf_iface_link_info *link_info;
+	u32 advertised_modes, supported_modes;
+
+	ethtool_link_ksettings_zero_link_mode(cmd, supported);
+	ethtool_link_ksettings_zero_link_mode(cmd, advertising);
+
+	octep_vf_get_link_info(oct);
+
+	advertised_modes = oct->link_info.advertised_modes;
+	supported_modes = oct->link_info.supported_modes;
+	link_info = &oct->link_info;
+
+	OCTEP_VF_SET_ETHTOOL_LINK_MODES_BITMAP(supported_modes, cmd, supported);
+	OCTEP_VF_SET_ETHTOOL_LINK_MODES_BITMAP(advertised_modes, cmd, advertising);
+
+	if (link_info->autoneg) {
+		if (link_info->autoneg & OCTEP_VF_LINK_MODE_AUTONEG_SUPPORTED)
+			ethtool_link_ksettings_add_link_mode(cmd, supported, Autoneg);
+		if (link_info->autoneg & OCTEP_VF_LINK_MODE_AUTONEG_ADVERTISED) {
+			ethtool_link_ksettings_add_link_mode(cmd, advertising, Autoneg);
+			cmd->base.autoneg = AUTONEG_ENABLE;
+		} else {
+			cmd->base.autoneg = AUTONEG_DISABLE;
+		}
+	} else {
+		cmd->base.autoneg = AUTONEG_DISABLE;
+	}
+
+	cmd->base.port = PORT_FIBRE;
+	ethtool_link_ksettings_add_link_mode(cmd, supported, FIBRE);
+	ethtool_link_ksettings_add_link_mode(cmd, advertising, FIBRE);
+
+	if (netif_carrier_ok(netdev)) {
+		cmd->base.speed = link_info->speed;
+		cmd->base.duplex = DUPLEX_FULL;
+	} else {
+		cmd->base.speed = SPEED_UNKNOWN;
+		cmd->base.duplex = DUPLEX_UNKNOWN;
+	}
+	return 0;
+}
+
+static const struct ethtool_ops octep_vf_ethtool_ops = {
+	.get_drvinfo = octep_vf_get_drvinfo,
+	.get_link = ethtool_op_get_link,
+	.get_strings = octep_vf_get_strings,
+	.get_sset_count = octep_vf_get_sset_count,
+	.get_ethtool_stats = octep_vf_get_ethtool_stats,
+	.get_link_ksettings = octep_vf_get_link_ksettings,
+};
+
+void octep_vf_set_ethtool_ops(struct net_device *netdev)
+{
+	netdev->ethtool_ops = &octep_vf_ethtool_ops;
+}

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c

@@ -1081,6 +1081,7 @@ static int octep_vf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	INIT_WORK(&octep_vf_dev->tx_timeout_task, octep_vf_tx_timeout_task);
 
 	netdev->netdev_ops = &octep_vf_netdev_ops;
+	octep_vf_set_ethtool_ops(netdev);
 	netif_carrier_off(netdev);
 
 	if (octep_vf_setup_mbox(octep_vf_dev)) {

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.h

@@ -331,6 +331,7 @@ void octep_vf_device_setup_cn93(struct octep_vf_device *oct);
 void octep_vf_device_setup_cnxk(struct octep_vf_device *oct);
 int octep_vf_iq_process_completions(struct octep_vf_iq *iq, u16 budget);
 int octep_vf_oq_process_rx(struct octep_vf_oq *oq, int budget);
+void octep_vf_set_ethtool_ops(struct net_device *netdev);
 int octep_vf_get_link_info(struct octep_vf_device *oct);
 int octep_vf_get_if_stats(struct octep_vf_device *oct);
 void octep_vf_mbox_work(struct work_struct *work);

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_mbox.c

@@ -114,7 +114,7 @@ static int __octep_vf_mbox_send_cmd(struct octep_vf_device *oct,
 {
 	struct octep_vf_mbox *mbox = oct->mbox;
 	u64 reg_val = 0ull;
-	int count;
+	int count = 0;
 
 	if (!mbox)
 		return OCTEP_PFVF_MBOX_CMD_STATUS_NOT_SETUP;