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From:   Justin Lai <justinlai0215@realtek.com>
To:     <kuba@kernel.org>
CC:     <davem@davemloft.net>, <edumazet@google.com>, <pabeni@redhat.com>,
        <linux-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
        <andrew@lunn.ch>, <pkshih@realtek.com>, <larry.chiu@realtek.com>,
        Justin Lai <justinlai0215@realtek.com>
Subject: [PATCH net-next v14 08/13] rtase: Implement net_device_ops
Date:   Fri, 8 Dec 2023 17:47:28 +0800
Message-ID: <20231208094733.1671296-9-justinlai0215@realtek.com>
In-Reply-To: <20231208094733.1671296-1-justinlai0215@realtek.com>
References: <20231208094733.1671296-1-justinlai0215@realtek.com>
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Precedence: bulk

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@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 237 ++++++++++++++++++
 1 file changed, 237 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 83a119389110..98e714d4874a 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -1428,6 +1428,11 @@ 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;
@@ -1460,6 +1465,203 @@ 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)
+{
+	dev->mtu = new_mtu;
+
+	netdev_update_features(dev);
+
+	return 0;
+}
+
+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_err(dev, "unable to init ring\n");
+		rtase_free_desc(tp);
+		return;
+	}
+
+	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_dump_tally_counter(const struct rtase_private *tp)
+{
+	dma_addr_t paddr = tp->tally_paddr;
+	u32 cmd = lower_32_bits(paddr);
+	u32 val;
+	int err;
+
+	rtase_w32(tp, RTASE_DTCCR4, upper_32_bits(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_dump_state(const struct net_device *dev)
+{
+	const struct rtase_private *tp = netdev_priv(dev);
+	int max_reg_size = RTASE_PCI_REGS_SIZE;
+	const struct rtase_counters *counters;
+	const struct rtase_ring *ring;
+	u32 dword_rd;
+	int n = 0;
+
+	ring = &tp->tx_ring[0];
+	netdev_err(dev, "Tx descriptor info:\n");
+	netdev_err(dev, "Tx curIdx = 0x%x\n", ring->cur_idx);
+	netdev_err(dev, "Tx dirtyIdx = 0x%x\n", ring->dirty_idx);
+	netdev_err(dev, "Tx phyAddr = %pad\n", &ring->phy_addr);
+
+	ring = &tp->rx_ring[0];
+	netdev_err(dev, "Rx descriptor info:\n");
+	netdev_err(dev, "Rx curIdx = 0x%x\n", ring->cur_idx);
+	netdev_err(dev, "Rx dirtyIdx = 0x%x\n", ring->dirty_idx);
+	netdev_err(dev, "Rx phyAddr = %pad\n", &ring->phy_addr);
+
+	netdev_err(dev, "Device Registers:\n");
+	netdev_err(dev, "Chip Command = 0x%02x\n", rtase_r8(tp, RTASE_CHIP_CMD));
+	netdev_err(dev, "IMR = %08x\n", rtase_r32(tp, RTASE_IMR0));
+	netdev_err(dev, "ISR = %08x\n", rtase_r32(tp, RTASE_ISR0));
+	netdev_err(dev, "Boot Ctrl Reg(0xE004) = %04x\n",
+		   rtase_r16(tp, RTASE_BOOT_CTL));
+	netdev_err(dev, "EPHY ISR(0xE014) = %04x\n",
+		   rtase_r16(tp, RTASE_EPHY_ISR));
+	netdev_err(dev, "EPHY IMR(0xE016) = %04x\n",
+		   rtase_r16(tp, RTASE_EPHY_IMR));
+	netdev_err(dev, "CLKSW SET REG(0xE018) = %04x\n",
+		   rtase_r16(tp, RTASE_CLKSW_SET));
+
+	netdev_err(dev, "Dump PCI Registers:\n");
+
+	while (n < max_reg_size) {
+		if ((n % RTASE_DWORD_MOD) == 0)
+			netdev_err(tp->dev, "0x%03x:\n", n);
+
+		pci_read_config_dword(tp->pdev, n, &dword_rd);
+		netdev_err(tp->dev, "%08x\n", dword_rd);
+		n += 4;
+	}
+
+	netdev_err(dev, "Dump tally counter:\n");
+	counters = tp->tally_vaddr;
+	rtase_dump_tally_counter(tp);
+
+	netdev_err(dev, "tx_packets %lld\n",
+		   le64_to_cpu(counters->tx_packets));
+	netdev_err(dev, "rx_packets %lld\n",
+		   le64_to_cpu(counters->rx_packets));
+	netdev_err(dev, "tx_errors %lld\n",
+		   le64_to_cpu(counters->tx_errors));
+	netdev_err(dev, "rx_errors %d\n",
+		   le32_to_cpu(counters->rx_errors));
+	netdev_err(dev, "rx_missed %d\n",
+		   le16_to_cpu(counters->rx_missed));
+	netdev_err(dev, "align_errors %d\n",
+		   le16_to_cpu(counters->align_errors));
+	netdev_err(dev, "tx_one_collision %d\n",
+		   le32_to_cpu(counters->tx_one_collision));
+	netdev_err(dev, "tx_multi_collision %d\n",
+		   le32_to_cpu(counters->tx_multi_collision));
+	netdev_err(dev, "rx_unicast %lld\n",
+		   le64_to_cpu(counters->rx_unicast));
+	netdev_err(dev, "rx_broadcast %lld\n",
+		   le64_to_cpu(counters->rx_broadcast));
+	netdev_err(dev, "rx_multicast %d\n",
+		   le32_to_cpu(counters->rx_multicast));
+	netdev_err(dev, "tx_aborted %d\n",
+		   le16_to_cpu(counters->tx_aborted));
+	netdev_err(dev, "tx_underun %d\n",
+		   le16_to_cpu(counters->tx_underun));
+}
+
+static void rtase_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	rtase_dump_state(dev);
+	rtase_sw_reset(dev);
+}
+
+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;
+
+	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);
+
+	stats->tx_errors = le64_to_cpu(counters->tx_errors);
+	stats->collisions = le32_to_cpu(counters->tx_multi_collision);
+	stats->tx_aborted_errors = le16_to_cpu(counters->tx_aborted);
+	stats->rx_missed_errors = le16_to_cpu(counters->rx_missed);
+}
+
 #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
@@ -1476,13 +1678,48 @@ static void rtase_netpoll(struct net_device *dev)
 }
 #endif
 
+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;
+
+	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,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller = rtase_netpoll,
 #endif
+	.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