Date: Tue, 26 Sep 2023 19:49:38 +0800
From: Justin Lai <justinlai0215@...ltek.com>
To: <kuba@...nel.org>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <andrew@...n.ch>, <pkshih@...ltek.com>, <larry.chiu@...ltek.com>,
        Justin Lai
	<justinlai0215@...ltek.com>
Subject: [PATCH net-next v8 08/13] net:ethernet:realtek:rtase: Implement net_device_ops

1. Implement .ndo_set_rx_mode so that the device can change address
list filtering.
2. Implement .ndo_set_mac_address so that mac address can be changed.
3. Implement .ndo_change_mtu so that mtu can be changed.
4. Implement .ndo_tx_timeout to perform related processing when the
transmitter does not make any progress.
5. Implement .ndo_get_stats64 to provide statistics that are called
when the user wants to get network device usage.
6. Implement .ndo_vlan_rx_add_vid to register VLAN ID when the device
supports VLAN filtering.
7. Implement .ndo_vlan_rx_kill_vid to unregister VLAN ID when the device
supports VLAN filtering.
8. Implement the .ndo_setup_tc to enable setting any "tc" scheduler,
classifier or action on dev.
9. Implement .ndo_fix_features enables adjusting requested feature flags
based on device-specific constraints.
10. Implement .ndo_set_features enables updating device configuration to
new features.

Signed-off-by: Justin Lai <justinlai0215@...ltek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 334 ++++++++++++++++++
 1 file changed, 334 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index edd00a393bf1..8ea0fd15e884 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -1437,6 +1437,11 @@ static netdev_tx_t rtase_start_xmit(struct sk_buff *skb,
 	return NETDEV_TX_BUSY;
 }
 
+static void rtase_set_rx_mode(struct net_device *dev)
+{
+	rtase_hw_set_rx_packet_filter(dev);
+}
+
 static void rtase_enable_eem_write(const struct rtase_private *tp)
 {
 	u8 val;
@@ -1469,6 +1474,240 @@ static void rtase_rar_set(const struct rtase_private *tp, const u8 *addr)
 	rtase_w16(tp, RTASE_LBK_CTRL, LBK_ATLD | LBK_CLR);
 }
 
+static int rtase_set_mac_address(struct net_device *dev, void *p)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret;
+
+	ret = eth_mac_addr(dev, p);
+	if (ret)
+		return ret;
+
+	rtase_rar_set(tp, dev->dev_addr);
+
+	return 0;
+}
+
+static int rtase_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret;
+
+	dev->mtu = new_mtu;
+
+	if (!netif_running(dev))
+		goto out;
+
+	rtase_down(dev);
+
+	rtase_set_rxbufsize(tp, dev);
+
+	ret = rtase_init_ring(dev);
+
+	if (ret)
+		return ret;
+
+	netif_stop_queue(dev);
+	netif_carrier_off(dev);
+	rtase_hw_config(dev);
+
+	/* always link, so start to transmit & receive */
+	rtase_hw_start(dev);
+	netif_carrier_on(dev);
+	netif_wake_queue(dev);
+
+out:
+	netdev_update_features(dev);
+
+	return ret;
+}
+
+static void rtase_wait_for_quiescence(const struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	struct rtase_int_vector *ivec;
+	u32 i;
+
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		synchronize_irq(ivec->irq);
+		/* wait for any pending NAPI task to complete */
+		napi_disable(&ivec->napi);
+	}
+
+	rtase_irq_dis_and_clear(tp);
+
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		napi_enable(&ivec->napi);
+	}
+}
+
+static void rtase_sw_reset(struct net_device *dev)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret;
+
+	netif_stop_queue(dev);
+	netif_carrier_off(dev);
+	rtase_hw_reset(dev);
+
+	/* let's wait a bit while any (async) irq lands on */
+	rtase_wait_for_quiescence(dev);
+	rtase_tx_clear(tp);
+	rtase_rx_clear(tp);
+
+	ret = rtase_init_ring(dev);
+	if (ret)
+		netdev_alert(dev, "unable to init ring\n");
+
+	rtase_hw_config(dev);
+	/* always link, so start to transmit & receive */
+	rtase_hw_start(dev);
+
+	netif_carrier_on(dev);
+	netif_wake_queue(dev);
+}
+
+static void rtase_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	rtase_sw_reset(dev);
+}
+
+static void rtase_dump_tally_counter(const struct rtase_private *tp,
+				     dma_addr_t paddr)
+{
+	u32 cmd = lower_32_bits(le64_to_cpu(paddr));
+	u32 val;
+	int err;
+
+	rtase_w32(tp, RTASE_DTCCR4, upper_32_bits(le64_to_cpu(paddr)));
+	rtase_w32(tp, RTASE_DTCCR0, cmd);
+	rtase_w32(tp, RTASE_DTCCR0, cmd | COUNTER_DUMP);
+
+	err = read_poll_timeout(rtase_r32, val, !(val & COUNTER_DUMP), 10, 250,
+				false, tp, RTASE_DTCCR0);
+
+	if (err == -ETIMEDOUT)
+		netdev_err(tp->dev, "error occurred in dump tally counter\n");
+}
+
+static void rtase_get_stats64(struct net_device *dev,
+			      struct rtnl_link_stats64 *stats)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	const struct rtase_counters *counters = tp->tally_vaddr;
+	dma_addr_t paddr = tp->tally_paddr;
+
+	if (!counters)
+		return;
+
+	netdev_stats_to_stats64(stats, &dev->stats);
+	dev_fetch_sw_netstats(stats, dev->tstats);
+
+	/* fetch additional counter values missing in stats collected by driver
+	 * from tally counter
+	 */
+	rtase_dump_tally_counter(tp, paddr);
+
+	stats->tx_errors = le64_to_cpu(counters->tx_errors);
+	stats->collisions = le64_to_cpu(counters->tx_multi_collision);
+	stats->tx_aborted_errors = le64_to_cpu(counters->tx_aborted);
+	stats->rx_missed_errors = le64_to_cpu(counters->rx_missed);
+}
+
+static void rtase_enable_vlan_filter(const struct rtase_private *tp, bool enabled)
+{
+	u16 tmp;
+
+	if (enabled == 1) {
+		tmp = rtase_r16(tp, RTASE_FCR);
+		if (!(tmp & FCR_VLAN_FTR_EN))
+			rtase_w16(tp, RTASE_FCR, tmp | FCR_VLAN_FTR_EN);
+
+		tmp = rtase_r16(tp, RTASE_PCPR);
+		if (!(tmp & PCPR_VLAN_FTR_EN))
+			rtase_w16(tp, RTASE_PCPR, tmp | PCPR_VLAN_FTR_EN);
+	} else {
+		tmp = rtase_r16(tp, RTASE_FCR);
+		if (tmp & FCR_VLAN_FTR_EN)
+			rtase_w16(tp, RTASE_FCR, tmp & ~FCR_VLAN_FTR_EN);
+
+		tmp = rtase_r16(tp, RTASE_PCPR);
+		if (!(tmp & PCPR_VLAN_FTR_EN))
+			rtase_w16(tp, RTASE_PCPR, tmp & ~PCPR_VLAN_FTR_EN);
+	}
+}
+
+static int rtase_vlan_rx_add_vid(struct net_device *dev, __be16 protocol,
+				 u16 vid)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	u16 tmp_mem, i;
+
+	if (be16_to_cpu(protocol) != ETH_P_8021Q)
+		return -EINVAL;
+
+	for (i = 0; i < RTASE_VLAN_FILTER_ENTRY_NUM; i++) {
+		u16 addr, mask;
+
+		if (!(tp->vlan_filter_ctrl & BIT(i))) {
+			tp->vlan_filter_ctrl |= BIT(i);
+			tp->vlan_filter_vid[i] = vid;
+			rtase_w32(tp, RTASE_VLAN_ENTRY_0 + i * 4,
+				  vid | VLAN_ENTRY_CAREBIT);
+			/* each 16-bit register contains two VLAN entries */
+			addr = RTASE_VLAN_ENTRY_MEM_0 + (i & ~0x1);
+			mask = 0x1 << ((i & 0x1) * 8);
+			tmp_mem = rtase_r16(tp, addr);
+			tmp_mem |= mask;
+			rtase_w16(tp, addr, tmp_mem);
+			break;
+		}
+	}
+
+	if (i == RTASE_VLAN_FILTER_ENTRY_NUM)
+		return -ENOENT;
+
+	rtase_enable_vlan_filter(tp, true);
+
+	return 0;
+}
+
+static int rtase_vlan_rx_kill_vid(struct net_device *dev, __be16 protocol,
+				  u16 vid)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	u16 tmp_mem, i;
+
+	if (be16_to_cpu(protocol) != ETH_P_8021Q)
+		return -EINVAL;
+
+	for (i = 0; i < RTASE_VLAN_FILTER_ENTRY_NUM; i++) {
+		u16 addr, mask;
+
+		if (tp->vlan_filter_vid[i] == vid) {
+			tp->vlan_filter_ctrl &= ~BIT(i);
+			tp->vlan_filter_vid[i] = 0;
+			rtase_w32(tp, RTASE_VLAN_ENTRY_0 + i * 4, 0);
+
+			/* each 16-bit register contains two VLAN entries */
+			addr = RTASE_VLAN_ENTRY_MEM_0 + (i & ~0x1);
+			mask = ~(0x1 << ((i & 0x1) * 8));
+			tmp_mem = rtase_r16(tp, addr);
+			tmp_mem &= mask;
+			rtase_w16(tp, addr, tmp_mem);
+			break;
+		}
+	}
+
+	/* check vlan filter enabled */
+	if (!tp->vlan_filter_ctrl)
+		rtase_enable_vlan_filter(tp, false);
+
+	return 0;
+}
+
 #ifdef CONFIG_NET_POLL_CONTROLLER
 /* Polling 'interrupt' - used by things like netconsole to send skbs
  * without having to re-enable interrupts. It's not called while
@@ -1485,13 +1724,108 @@ static void rtase_netpoll(struct net_device *dev)
 }
 #endif
 
+static void rtase_set_hw_cbs(const struct rtase_private *tp, u32 queue)
+{
+	u32 idle = tp->tx_qos[queue].idleslope * RTASE_1T_CLOCK;
+	u32 val, i;
+
+	val = u32_encode_bits(idle / RTASE_1T_POWER, RTASE_IDLESLOPE_INT_MASK);
+	idle %= RTASE_1T_POWER;
+
+	for (i = 1; i <= RTASE_IDLESLOPE_INT_SHIFT; i++) {
+		idle *= 2;
+		if ((idle / RTASE_1T_POWER) == 1)
+			val |= BIT(RTASE_IDLESLOPE_INT_SHIFT - i);
+
+		idle %= RTASE_1T_POWER;
+	}
+	rtase_w32(tp, RTASE_TXQCRDT_0 + queue * 4, val);
+}
+
+static int rtase_setup_tc_cbs(struct rtase_private *tp,
+			      const struct tc_cbs_qopt_offload *qopt)
+{
+	u32 queue = qopt->queue;
+
+	tp->tx_qos[queue].hicredit = qopt->hicredit;
+	tp->tx_qos[queue].locredit = qopt->locredit;
+	tp->tx_qos[queue].idleslope = qopt->idleslope;
+	tp->tx_qos[queue].sendslope = qopt->sendslope;
+
+	/* set hardware cbs */
+	rtase_set_hw_cbs(tp, queue);
+
+	return 0;
+}
+
+static int rtase_setup_tc(struct net_device *dev, enum tc_setup_type type,
+			  void *type_data)
+{
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret = 0;
+
+	switch (type) {
+	case TC_SETUP_QDISC_MQPRIO:
+		break;
+	case TC_SETUP_BLOCK:
+		break;
+	case TC_SETUP_QDISC_CBS:
+		ret = rtase_setup_tc_cbs(tp, type_data);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ret;
+}
+
+static netdev_features_t rtase_fix_features(struct net_device *dev,
+					    netdev_features_t features)
+{
+	netdev_features_t features_fix = features;
+
+	if (dev->mtu > MSS_MAX)
+		features_fix &= ~NETIF_F_ALL_TSO;
+
+	if (dev->mtu > ETH_DATA_LEN) {
+		features_fix &= ~NETIF_F_ALL_TSO;
+		features_fix &= ~NETIF_F_CSUM_MASK;
+	}
+
+	return features_fix;
+}
+
+static int rtase_set_features(struct net_device *dev,
+			      netdev_features_t features)
+{
+	netdev_features_t features_set = features;
+
+	features_set &= NETIF_F_RXALL | NETIF_F_RXCSUM |
+			NETIF_F_HW_VLAN_CTAG_RX;
+
+	if (features_set ^ dev->features)
+		rtase_hw_set_features(dev, features_set);
+
+	return 0;
+}
+
 static const struct net_device_ops rtase_netdev_ops = {
 	.ndo_open = rtase_open,
 	.ndo_stop = rtase_close,
 	.ndo_start_xmit = rtase_start_xmit,
+	.ndo_set_rx_mode = rtase_set_rx_mode,
+	.ndo_set_mac_address = rtase_set_mac_address,
+	.ndo_change_mtu = rtase_change_mtu,
+	.ndo_tx_timeout = rtase_tx_timeout,
+	.ndo_get_stats64 = rtase_get_stats64,
+	.ndo_vlan_rx_add_vid = rtase_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid = rtase_vlan_rx_kill_vid,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller = rtase_netpoll,
 #endif
+	.ndo_setup_tc = rtase_setup_tc,
+	.ndo_fix_features = rtase_fix_features,
+	.ndo_set_features = rtase_set_features,
 };
 
 static void rtase_get_mac_address(struct net_device *dev)
-- 
2.34.1

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