netdev - [RFC net-next v17 6/6] eea: introduce callback for ndo_get

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Message-Id: <20251229014844.126452-7-xuanzhuo@linux.alibaba.com>
Date: Mon, 29 Dec 2025 09:48:44 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Wen Gu <guwen@...ux.alibaba.com>,
	Philo Lu <lulie@...ux.alibaba.com>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Lukas Bulwahn <lukas.bulwahn@...hat.com>,
	Dong Yibo <dong100@...se.com>,
	Vivian Wang <wangruikang@...as.ac.cn>,
	MD Danish Anwar <danishanwar@...com>,
	Dust Li <dust.li@...ux.alibaba.com>
Subject: [RFC net-next v17 6/6] eea: introduce callback for ndo_get_stats64

Add basic driver framework for the Alibaba Elastic Ethernet Adapter(EEA).

This commit introduces ndo_get_stats64 support.

Reviewed-by: Dust Li <dust.li@...ux.alibaba.com>
Reviewed-by: Philo Lu <lulie@...ux.alibaba.com>
Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/ethernet/alibaba/eea/eea_net.c | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/net/ethernet/alibaba/eea/eea_net.c b/drivers/net/ethernet/alibaba/eea/eea_net.c
index 7b43823ca3b1..b085f89997d2 100644
--- a/drivers/net/ethernet/alibaba/eea/eea_net.c
+++ b/drivers/net/ethernet/alibaba/eea/eea_net.c
@@ -269,6 +269,52 @@ static int eea_netdev_open(struct net_device *netdev)
 	return err;
 }
 
+static void eea_stats(struct net_device *netdev, struct rtnl_link_stats64 *tot)
+{
+	struct eea_net *enet = netdev_priv(netdev);
+	u64 packets, bytes;
+	u32 start;
+	int i;
+
+	/* This function is protected by RCU. Here uses enet->tx and enet->rx
+	 * to check whether the TX and RX structures are safe to access. In
+	 * eea_free_rxtx_q_mem, before freeing the TX and RX resources, enet->rx
+	 * and enet->tx are set to NULL, and synchronize_net is called.
+	 */
+
+	if (enet->rx) {
+		for (i = 0; i < enet->cfg.rx_ring_num; i++) {
+			struct eea_net_rx *rx = enet->rx[i];
+
+			do {
+				start = u64_stats_fetch_begin(&rx->stats.syncp);
+				packets = u64_stats_read(&rx->stats.packets);
+				bytes = u64_stats_read(&rx->stats.bytes);
+			} while (u64_stats_fetch_retry(&rx->stats.syncp,
+						       start));
+
+			tot->rx_packets += packets;
+			tot->rx_bytes   += bytes;
+		}
+	}
+
+	if (enet->tx) {
+		for (i = 0; i < enet->cfg.tx_ring_num; i++) {
+			struct eea_net_tx *tx = &enet->tx[i];
+
+			do {
+				start = u64_stats_fetch_begin(&tx->stats.syncp);
+				packets = u64_stats_read(&tx->stats.packets);
+				bytes = u64_stats_read(&tx->stats.bytes);
+			} while (u64_stats_fetch_retry(&tx->stats.syncp,
+						       start));
+
+			tot->tx_packets += packets;
+			tot->tx_bytes   += bytes;
+		}
+	}
+}
+
 /* resources: ring, buffers, irq */
 int eea_reset_hw_resources(struct eea_net *enet, struct eea_net_init_ctx *ctx)
 {
@@ -453,6 +499,7 @@ static const struct net_device_ops eea_netdev = {
 	.ndo_stop           = eea_netdev_stop,
 	.ndo_start_xmit     = eea_tx_xmit,
 	.ndo_validate_addr  = eth_validate_addr,
+	.ndo_get_stats64    = eea_stats,
 	.ndo_features_check = passthru_features_check,
 	.ndo_tx_timeout     = eea_tx_timeout,
 };
-- 
2.32.0.3.g01195cf9f