[PATCH net-next v4 0/5] net: wangxun: timeout and error

[PATCH net-next v4 0/5] net: wangxun: timeout and error

[Jiawen Wu]

This series is a split of the previous series:
https://lore.kernel.org/all/20260326021406.30444-1-jiawenwu@trustnetic.com

It is about adding the Tx timeout process and pci_error_handlers.

Changes log:
v4:
- Create a separate work queue for the reset task.
- Gate wx_watchdog_flush_tx() on netif_running().
- Add rtnl_lock() around wx->do_reset() in wx_io_slot_reset().
- Change .close_suspend() to .soft_quiesce() to avoid MMIO when PCI
  channel is frozen.

v3: https://lore.kernel.org/all/20260509100540.32612-1-jiawenwu@trustnetic.com
- Merge the multiple string line into one in wx_handle_tx_hang().
- Remove the redundant warn messages.
- Use test_and_clear_bit() instead of checking the flag bit then clear it.
- Drop the Tx hang check in tx_timeout.
- Call wx_update_stats() before wx_check_tx_hang().
- Add Tx flush when link lost.
- Move wx_ptp_stop() into wx->close_suspend().
- Drop V2 patch 5/6 because WOL packets are handled before DMA ring.
- Check wx NULL pointer in wx_io_error_detected().
- Check perm failure before hardware teardown.

v2: https://lore.kernel.org/all/20260430082517.19612-1-jiawenwu@trustnetic.com
- Add the missing rtnl_unlock() at early return in wx_reset_subtask().
- Replace ngbe_close() with ngbe_close_suspend() in ngbe_dev_shutdown().
- Add a patch to clear stored DMA addresses.
 
v1: https://lore.kernel.org/r/20260428021156.13564-1-jiawenwu@trustnetic.com

The changes from the last full patch set V6:
- Add 'else' handling in ngbe_do_reset().
- Acquire rtnl_lock() before checking netif_running() in
  wx_reset_subtask().
- Use test_and_clear_bit() instead of test_bit()…clear_bit() to avoid
  losing another reset request.
- Change ‘u64 tx_done_old’ to ‘u32’ to avoid data race between
  dev_watchdog and NAPI polling.
- Check the return value of ndo_open() in wx_io_resume().
- Drop pci_save_state().

Jiawen Wu (5):
  net: ngbe: implement libwx reset ops
  net: wangxun: add Tx timeout process
  net: wangxun: add reinit parameter to wx->do_reset callback
  net: wangxun: introduce soft quiesce callbacks for AER recovery
  net: wangxun: implement pci_error_handlers ops

 drivers/net/ethernet/wangxun/libwx/Makefile   |   2 +-
 drivers/net/ethernet/wangxun/libwx/wx_err.c   | 281 ++++++++++++++++++
 drivers/net/ethernet/wangxun/libwx/wx_err.h   |  18 ++
 .../net/ethernet/wangxun/libwx/wx_ethtool.c   |   2 +-
 drivers/net/ethernet/wangxun/libwx/wx_hw.c    |  17 +-
 drivers/net/ethernet/wangxun/libwx/wx_lib.c   |  41 ++-
 drivers/net/ethernet/wangxun/libwx/wx_type.h  |  23 +-
 .../net/ethernet/wangxun/ngbe/ngbe_ethtool.c  |   1 -
 drivers/net/ethernet/wangxun/ngbe/ngbe_main.c |  83 +++++-
 drivers/net/ethernet/wangxun/ngbe/ngbe_type.h |   1 +
 .../net/ethernet/wangxun/txgbe/txgbe_main.c   |  48 ++-
 .../net/ethernet/wangxun/txgbe/txgbe_type.h   |   2 +-
 12 files changed, 500 insertions(+), 19 deletions(-)
 create mode 100644 drivers/net/ethernet/wangxun/libwx/wx_err.c
 create mode 100644 drivers/net/ethernet/wangxun/libwx/wx_err.h

-- 
2.51.0

[PATCH net-next v4 1/5] net: ngbe: implement libwx reset ops

[Jiawen Wu]

Implement wx->do_reset() for library module calling.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 .../net/ethernet/wangxun/ngbe/ngbe_ethtool.c  |  1 -
 drivers/net/ethernet/wangxun/ngbe/ngbe_main.c | 37 ++++++++++++++++++-
 drivers/net/ethernet/wangxun/ngbe/ngbe_type.h |  1 +
 3 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_ethtool.c b/drivers/net/ethernet/wangxun/ngbe/ngbe_ethtool.c
index b2e191982803..1960f7154151 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_ethtool.c
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_ethtool.c
@@ -59,7 +59,6 @@ static int ngbe_set_ringparam(struct net_device *netdev,
 	wx_set_ring(wx, new_tx_count, new_rx_count, temp_ring);
 	kvfree(temp_ring);
 
-	wx_configure(wx);
 	ngbe_up(wx);
 
 clear_reset:
diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
index 8678c49b892a..dea6dfb043f3 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
@@ -133,6 +133,7 @@ static int ngbe_sw_init(struct wx *wx)
 
 	wx->mbx.size = WX_VXMAILBOX_SIZE;
 	wx->setup_tc = ngbe_setup_tc;
+	wx->do_reset = ngbe_do_reset;
 	set_bit(0, &wx->fwd_bitmask);
 
 	return 0;
@@ -423,7 +424,7 @@ void ngbe_down(struct wx *wx)
 	wx_clean_all_rx_rings(wx);
 }
 
-void ngbe_up(struct wx *wx)
+static void ngbe_up_complete(struct wx *wx)
 {
 	wx_configure_vectors(wx);
 
@@ -490,7 +491,7 @@ static int ngbe_open(struct net_device *netdev)
 
 	wx_ptp_init(wx);
 
-	ngbe_up(wx);
+	ngbe_up_complete(wx);
 
 	return 0;
 err_dis_phy:
@@ -503,6 +504,12 @@ static int ngbe_open(struct net_device *netdev)
 	return err;
 }
 
+void ngbe_up(struct wx *wx)
+{
+	wx_configure(wx);
+	ngbe_up_complete(wx);
+}
+
 /**
  * ngbe_close - Disables a network interface
  * @netdev: network interface device structure
@@ -590,6 +597,8 @@ int ngbe_setup_tc(struct net_device *dev, u8 tc)
 	 */
 	if (netif_running(dev))
 		ngbe_close(dev);
+	else
+		ngbe_reset(wx);
 
 	wx_clear_interrupt_scheme(wx);
 
@@ -606,6 +615,30 @@ int ngbe_setup_tc(struct net_device *dev, u8 tc)
 	return 0;
 }
 
+static void ngbe_reinit_locked(struct wx *wx)
+{
+	netif_trans_update(wx->netdev);
+
+	mutex_lock(&wx->reset_lock);
+	set_bit(WX_STATE_RESETTING, wx->state);
+
+	ngbe_down(wx);
+	ngbe_up(wx);
+
+	clear_bit(WX_STATE_RESETTING, wx->state);
+	mutex_unlock(&wx->reset_lock);
+}
+
+void ngbe_do_reset(struct net_device *netdev)
+{
+	struct wx *wx = netdev_priv(netdev);
+
+	if (netif_running(netdev))
+		ngbe_reinit_locked(wx);
+	else
+		ngbe_reset(wx);
+}
+
 static const struct net_device_ops ngbe_netdev_ops = {
 	.ndo_open               = ngbe_open,
 	.ndo_stop               = ngbe_close,
diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h b/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h
index 7077a0da4c98..4f648f272c08 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h
@@ -125,5 +125,6 @@ extern char ngbe_driver_name[];
 void ngbe_down(struct wx *wx);
 void ngbe_up(struct wx *wx);
 int ngbe_setup_tc(struct net_device *dev, u8 tc);
+void ngbe_do_reset(struct net_device *netdev);
 
 #endif /* _NGBE_TYPE_H_ */
-- 
2.51.0

[PATCH net-next v4 2/5] net: wangxun: add Tx timeout process

[Jiawen Wu]

Implement .ndo_tx_timeout to handle Tx side timeout event. When a Tx
timeout event occur, it will trigger driver into reset process.

The WX_HANG_CHECK_ARMED bit is set to indicate a potential hang. It will
be cleared if a pause frame is received to avoid false hang detection
caused by pause frames.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 drivers/net/ethernet/wangxun/libwx/Makefile   |   2 +-
 drivers/net/ethernet/wangxun/libwx/wx_err.c   | 170 ++++++++++++++++++
 drivers/net/ethernet/wangxun/libwx/wx_err.h   |  16 ++
 drivers/net/ethernet/wangxun/libwx/wx_hw.c    |  17 +-
 drivers/net/ethernet/wangxun/libwx/wx_lib.c   |  37 ++++
 drivers/net/ethernet/wangxun/libwx/wx_type.h  |  19 +-
 drivers/net/ethernet/wangxun/ngbe/ngbe_main.c |  14 ++
 .../net/ethernet/wangxun/txgbe/txgbe_main.c   |  14 ++
 8 files changed, 284 insertions(+), 5 deletions(-)
 create mode 100644 drivers/net/ethernet/wangxun/libwx/wx_err.c
 create mode 100644 drivers/net/ethernet/wangxun/libwx/wx_err.h

diff --git a/drivers/net/ethernet/wangxun/libwx/Makefile b/drivers/net/ethernet/wangxun/libwx/Makefile
index a71b0ad77de3..c8724bb129aa 100644
--- a/drivers/net/ethernet/wangxun/libwx/Makefile
+++ b/drivers/net/ethernet/wangxun/libwx/Makefile
@@ -4,5 +4,5 @@
 
 obj-$(CONFIG_LIBWX) += libwx.o
 
-libwx-objs := wx_hw.o wx_lib.o wx_ethtool.o wx_ptp.o wx_mbx.o wx_sriov.o
+libwx-objs := wx_hw.o wx_lib.o wx_ethtool.o wx_ptp.o wx_mbx.o wx_sriov.o wx_err.o
 libwx-objs += wx_vf.o wx_vf_lib.o wx_vf_common.o
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.c b/drivers/net/ethernet/wangxun/libwx/wx_err.c
new file mode 100644
index 000000000000..982a438d009e
--- /dev/null
+++ b/drivers/net/ethernet/wangxun/libwx/wx_err.c
@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2015 - 2026 Beijing WangXun Technology Co., Ltd. */
+/* Copyright (c) 1999 - 2026 Intel Corporation. */
+
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+
+#include "wx_type.h"
+#include "wx_lib.h"
+#include "wx_err.h"
+
+static void wx_pf_reset_subtask(struct wx *wx)
+{
+	if (!test_and_clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags))
+		return;
+
+	wx_warn(wx, "Reset adapter.\n");
+	if (wx->do_reset)
+		wx->do_reset(wx->netdev);
+}
+
+static void wx_reset_task(struct work_struct *work)
+{
+	struct wx *wx = container_of(work, struct wx, reset_task);
+
+	rtnl_lock();
+
+	if (test_bit(WX_STATE_DOWN, wx->state) ||
+	    test_bit(WX_STATE_RESETTING, wx->state))
+		goto out;
+
+	wx_pf_reset_subtask(wx);
+
+out:
+	rtnl_unlock();
+}
+
+void wx_check_err_subtask(struct wx *wx)
+{
+	if (test_bit(WX_FLAG_NEED_PF_RESET, wx->flags))
+		queue_work(wx->reset_wq, &wx->reset_task);
+}
+EXPORT_SYMBOL(wx_check_err_subtask);
+
+int wx_init_err_task(struct wx *wx)
+{
+	wx->reset_wq = alloc_workqueue("wx_reset_wq", WQ_UNBOUND | WQ_HIGHPRI, 1);
+	if (!wx->reset_wq) {
+		pr_err("Failed to create wx_reset_wq workqueue\n");
+		return -ENOMEM;
+	}
+
+	INIT_WORK(&wx->reset_task, wx_reset_task);
+	return 0;
+}
+EXPORT_SYMBOL(wx_init_err_task);
+
+static bool wx_ring_tx_pending(struct wx *wx)
+{
+	int i;
+
+	for (i = 0; i < wx->num_tx_queues; i++) {
+		struct wx_ring *tx_ring = wx->tx_ring[i];
+
+		if (tx_ring->next_to_use != tx_ring->next_to_clean)
+			return true;
+	}
+
+	return false;
+}
+
+static bool wx_vf_tx_pending(struct wx *wx)
+{
+	struct wx_ring_feature *vmdq = &wx->ring_feature[RING_F_VMDQ];
+	u32 q_per_pool = __ALIGN_MASK(1, ~vmdq->mask);
+	u32 i, j;
+
+	if (!wx->num_vfs)
+		return false;
+
+	for (i = 0; i < wx->num_vfs; i++) {
+		for (j = 0; j < q_per_pool; j++) {
+			u32 h, t;
+
+			h = rd32(wx, WX_PX_TR_RP_PV(q_per_pool, i, j));
+			t = rd32(wx, WX_PX_TR_WP_PV(q_per_pool, i, j));
+
+			if (h != t)
+				return true;
+		}
+	}
+
+	return false;
+}
+
+static void wx_watchdog_flush_tx(struct wx *wx)
+{
+	if (!netif_running(wx->netdev))
+		return;
+	if (netif_carrier_ok(wx->netdev))
+		return;
+
+	if (wx_ring_tx_pending(wx) || wx_vf_tx_pending(wx)) {
+		/* We've lost link, so the controller stops DMA,
+		 * but we've got queued Tx work that's never going
+		 * to get done, so reset controller to flush Tx.
+		 * (Do the reset outside of interrupt context).
+		 */
+		wx_warn(wx, "initiating reset due to lost link with pending Tx work\n");
+		set_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
+	}
+}
+
+static void wx_check_tx_hang(struct wx *wx)
+{
+	int i;
+
+	/* If we're down or resetting, just bail */
+	if (!netif_running(wx->netdev) ||
+	    test_bit(WX_STATE_RESETTING, wx->state))
+		return;
+
+	/* Force detection of hung controller */
+	if (netif_carrier_ok(wx->netdev)) {
+		for (i = 0; i < wx->num_tx_queues; i++)
+			set_bit(WX_TX_DETECT_HANG, wx->tx_ring[i]->state);
+	}
+}
+
+void wx_check_tx_hang_subtask(struct wx *wx)
+{
+	wx_watchdog_flush_tx(wx);
+	wx_check_tx_hang(wx);
+}
+EXPORT_SYMBOL(wx_check_tx_hang_subtask);
+
+static void wx_tx_timeout_reset(struct wx *wx)
+{
+	if (test_bit(WX_STATE_DOWN, wx->state))
+		return;
+
+	set_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
+	wx_warn(wx, "initiating reset due to tx timeout\n");
+	wx_service_event_schedule(wx);
+}
+
+void wx_tx_timeout(struct net_device *netdev, unsigned int __always_unused txqueue)
+{
+	struct wx *wx = netdev_priv(netdev);
+
+	wx_tx_timeout_reset(wx);
+}
+EXPORT_SYMBOL(wx_tx_timeout);
+
+void wx_handle_tx_hang(struct wx_ring *tx_ring, unsigned int next)
+{
+	struct wx *wx = netdev_priv(tx_ring->netdev);
+
+	wx_warn(wx,
+		"Detected Tx Unit Hang: Queue %d, TDH %x, TDT %x, ntu %x, ntc %x, ntc.time_stamp %lx, jiffies %lx\n",
+		tx_ring->queue_index,
+		rd32(wx, WX_PX_TR_RP(tx_ring->reg_idx)),
+		rd32(wx, WX_PX_TR_WP(tx_ring->reg_idx)),
+		tx_ring->next_to_use, next,
+		tx_ring->tx_buffer_info[next].time_stamp, jiffies);
+
+	netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
+
+	wx_tx_timeout_reset(wx);
+}
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.h b/drivers/net/ethernet/wangxun/libwx/wx_err.h
new file mode 100644
index 000000000000..a529bf54eeac
--- /dev/null
+++ b/drivers/net/ethernet/wangxun/libwx/wx_err.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * WangXun Gigabit PCI Express Linux driver
+ * Copyright (c) 2015 - 2026 Beijing WangXun Technology Co., Ltd.
+ */
+
+#ifndef _WX_ERR_H_
+#define _WX_ERR_H_
+
+void wx_check_err_subtask(struct wx *wx);
+int wx_init_err_task(struct wx *wx);
+void wx_check_tx_hang_subtask(struct wx *wx);
+void wx_tx_timeout(struct net_device *netdev, unsigned int txqueue);
+void wx_handle_tx_hang(struct wx_ring *tx_ring, unsigned int next);
+
+#endif /* _WX_ERR_H_ */
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_hw.c b/drivers/net/ethernet/wangxun/libwx/wx_hw.c
index 260e14d5d541..122c4952d203 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_hw.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_hw.c
@@ -1932,6 +1932,7 @@ static void wx_configure_tx_ring(struct wx *wx,
 	else
 		ring->atr_sample_rate = 0;
 
+	bitmap_zero(ring->state, WX_RING_STATE_NBITS);
 	/* reinitialize tx_buffer_info */
 	memset(ring->tx_buffer_info, 0,
 	       sizeof(struct wx_tx_buffer) * ring->count);
@@ -2851,16 +2852,26 @@ EXPORT_SYMBOL(wx_fc_enable);
 static void wx_update_xoff_rx_lfc(struct wx *wx)
 {
 	struct wx_hw_stats *hwstats = &wx->stats;
+	u64 data;
+	int i;
 
 	if (wx->fc.mode != wx_fc_full &&
 	    wx->fc.mode != wx_fc_rx_pause)
 		return;
 
 	if (wx->mac.type >= wx_mac_aml)
-		hwstats->lxoffrxc += rd32_wrap(wx, WX_MAC_LXOFFRXC_AML,
-					       &wx->last_stats.lxoffrxc);
+		data = rd32_wrap(wx, WX_MAC_LXOFFRXC_AML,
+				 &wx->last_stats.lxoffrxc);
 	else
-		hwstats->lxoffrxc += rd64(wx, WX_MAC_LXOFFRXC);
+		data = rd64(wx, WX_MAC_LXOFFRXC);
+	hwstats->lxoffrxc += data;
+
+	/* refill credits (no tx hang) if we received xoff */
+	if (!data)
+		return;
+
+	for (i = 0; i < wx->num_tx_queues; i++)
+		clear_bit(WX_HANG_CHECK_ARMED, wx->tx_ring[i]->state);
 }
 
 /**
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_lib.c b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
index d042567b8128..da4d9e229c9e 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
@@ -14,6 +14,7 @@
 
 #include "wx_type.h"
 #include "wx_lib.h"
+#include "wx_err.h"
 #include "wx_ptp.h"
 #include "wx_hw.h"
 #include "wx_vf_lib.h"
@@ -742,6 +743,37 @@ static struct netdev_queue *wx_txring_txq(const struct wx_ring *ring)
 	return netdev_get_tx_queue(ring->netdev, ring->queue_index);
 }
 
+static u32 wx_get_tx_pending(struct wx_ring *ring)
+{
+	unsigned int head, tail;
+
+	head = ring->next_to_clean;
+	tail = ring->next_to_use;
+
+	return ((head <= tail) ? tail : tail + ring->count) - head;
+}
+
+static bool wx_check_tx_hang(struct wx_ring *ring)
+{
+	u32 tx_done_old = ring->tx_stats.tx_done_old;
+	u32 tx_pending = wx_get_tx_pending(ring);
+	u32 tx_done = ring->stats.packets;
+
+	if (!test_and_clear_bit(WX_TX_DETECT_HANG, ring->state))
+		return false;
+
+	if (tx_done_old == tx_done && tx_pending)
+		/* make sure it is true for two checks in a row */
+		return test_and_set_bit(WX_HANG_CHECK_ARMED, ring->state);
+
+	/* update completed stats and continue */
+	ring->tx_stats.tx_done_old = tx_done;
+	/* reset the countdown */
+	clear_bit(WX_HANG_CHECK_ARMED, ring->state);
+
+	return false;
+}
+
 /**
  * wx_clean_tx_irq - Reclaim resources after transmit completes
  * @q_vector: structure containing interrupt and ring information
@@ -866,6 +898,11 @@ static bool wx_clean_tx_irq(struct wx_q_vector *q_vector,
 	netdev_tx_completed_queue(wx_txring_txq(tx_ring),
 				  total_packets, total_bytes);
 
+	if (wx_check_tx_hang(tx_ring)) {
+		wx_handle_tx_hang(tx_ring, i);
+		return true;
+	}
+
 #define TX_WAKE_THRESHOLD (DESC_NEEDED * 2)
 	if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) &&
 		     (wx_desc_unused(tx_ring) >= TX_WAKE_THRESHOLD))) {
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h b/drivers/net/ethernet/wangxun/libwx/wx_type.h
index c7befe4cdfe9..75d74ca2e259 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
+++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
@@ -450,6 +450,11 @@ enum WX_MSCA_CMD_value {
 #define WX_PX_TR_CFG_THRE_SHIFT      8
 #define WX_PX_TR_CFG_HEAD_WB         BIT(27)
 
+#define WX_PX_TR_RP_PV(q_per_pool, vf_number, vf_q_index) \
+		(WX_PX_TR_RP((q_per_pool) * (vf_number) + (vf_q_index)))
+#define WX_PX_TR_WP_PV(q_per_pool, vf_number, vf_q_index) \
+		(WX_PX_TR_WP((q_per_pool) * (vf_number) + (vf_q_index)))
+
 /* Receive DMA Registers */
 #define WX_PX_RR_BAL(_i)             (0x01000 + ((_i) * 0x40))
 #define WX_PX_RR_BAH(_i)             (0x01004 + ((_i) * 0x40))
@@ -1039,6 +1044,7 @@ struct wx_queue_stats {
 struct wx_tx_queue_stats {
 	u64 restart_queue;
 	u64 tx_busy;
+	u32 tx_done_old;
 };
 
 struct wx_rx_queue_stats {
@@ -1054,6 +1060,12 @@ struct wx_rx_queue_stats {
 #define wx_for_each_ring(posm, headm) \
 	for (posm = (headm).ring; posm; posm = posm->next)
 
+enum wx_ring_state {
+	WX_TX_DETECT_HANG,
+	WX_HANG_CHECK_ARMED,
+	WX_RING_STATE_NBITS
+};
+
 struct wx_ring_container {
 	struct wx_ring *ring;           /* pointer to linked list of rings */
 	unsigned int total_bytes;       /* total bytes processed this int */
@@ -1073,6 +1085,7 @@ struct wx_ring {
 		struct wx_tx_buffer *tx_buffer_info;
 		struct wx_rx_buffer *rx_buffer_info;
 	};
+	DECLARE_BITMAP(state, WX_RING_STATE_NBITS);
 	u8 __iomem *tail;
 	dma_addr_t dma;                 /* phys. address of descriptor ring */
 	dma_addr_t headwb_dma;
@@ -1274,6 +1287,7 @@ enum wx_pf_flags {
 	WX_FLAG_NEED_DO_RESET,
 	WX_FLAG_RX_MERGE_ENABLED,
 	WX_FLAG_TXHEAD_WB_ENABLED,
+	WX_FLAG_NEED_PF_RESET,
 	WX_PF_FLAGS_NBITS               /* must be last */
 };
 
@@ -1422,6 +1436,8 @@ struct wx {
 
 	struct timer_list service_timer;
 	struct work_struct service_task;
+	struct work_struct reset_task;
+	struct workqueue_struct *reset_wq;
 	struct mutex reset_lock; /* mutex for reset */
 };
 
@@ -1504,7 +1520,8 @@ rd32_wrap(struct wx *wx, u32 reg, u32 *last)
 
 #define wx_err(wx, fmt, arg...) \
 	dev_err(&(wx)->pdev->dev, fmt, ##arg)
-
+#define wx_warn(wx, fmt, arg...) \
+	dev_warn(&(wx)->pdev->dev, fmt, ##arg)
 #define wx_dbg(wx, fmt, arg...) \
 	dev_dbg(&(wx)->pdev->dev, fmt, ##arg)
 
diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
index dea6dfb043f3..9aae0429995d 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
@@ -14,6 +14,7 @@
 #include "../libwx/wx_type.h"
 #include "../libwx/wx_hw.h"
 #include "../libwx/wx_lib.h"
+#include "../libwx/wx_err.h"
 #include "../libwx/wx_ptp.h"
 #include "../libwx/wx_mbx.h"
 #include "../libwx/wx_sriov.h"
@@ -148,6 +149,8 @@ static void ngbe_service_task(struct work_struct *work)
 	struct wx *wx = container_of(work, struct wx, service_task);
 
 	wx_update_stats(wx);
+	wx_check_tx_hang_subtask(wx);
+	wx_check_err_subtask(wx);
 
 	wx_service_event_complete(wx);
 }
@@ -393,6 +396,7 @@ static void ngbe_disable_device(struct wx *wx)
 	netif_tx_stop_all_queues(netdev);
 	netif_tx_disable(netdev);
 
+	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
 	timer_delete_sync(&wx->service_timer);
 	cancel_work_sync(&wx->service_task);
 
@@ -644,6 +648,7 @@ static const struct net_device_ops ngbe_netdev_ops = {
 	.ndo_stop               = ngbe_close,
 	.ndo_change_mtu         = wx_change_mtu,
 	.ndo_start_xmit         = wx_xmit_frame,
+	.ndo_tx_timeout         = wx_tx_timeout,
 	.ndo_set_rx_mode        = wx_set_rx_mode,
 	.ndo_set_features       = wx_set_features,
 	.ndo_fix_features       = wx_fix_features,
@@ -733,6 +738,7 @@ static int ngbe_probe(struct pci_dev *pdev,
 	wx->driver_name = ngbe_driver_name;
 	ngbe_set_ethtool_ops(netdev);
 	netdev->netdev_ops = &ngbe_netdev_ops;
+	netdev->watchdog_timeo = 5 * HZ;
 
 	netdev->features = NETIF_F_SG | NETIF_F_IP_CSUM |
 			   NETIF_F_TSO | NETIF_F_TSO6 |
@@ -830,6 +836,10 @@ static int ngbe_probe(struct pci_dev *pdev,
 	eth_hw_addr_set(netdev, wx->mac.perm_addr);
 	wx_mac_set_default_filter(wx, wx->mac.perm_addr);
 
+	err = wx_init_err_task(wx);
+	if (err)
+		goto err_free_mac_table;
+
 	ngbe_init_service(wx);
 
 	err = wx_init_interrupt_scheme(wx);
@@ -857,6 +867,8 @@ static int ngbe_probe(struct pci_dev *pdev,
 err_cancel_service:
 	timer_delete_sync(&wx->service_timer);
 	cancel_work_sync(&wx->service_task);
+	cancel_work_sync(&wx->reset_task);
+	destroy_workqueue(wx->reset_wq);
 err_free_mac_table:
 	kfree(wx->rss_key);
 	kfree(wx->mac_table);
@@ -888,6 +900,8 @@ static void ngbe_remove(struct pci_dev *pdev)
 
 	timer_shutdown_sync(&wx->service_timer);
 	cancel_work_sync(&wx->service_task);
+	cancel_work_sync(&wx->reset_task);
+	destroy_workqueue(wx->reset_wq);
 
 	phylink_destroy(wx->phylink);
 	pci_release_selected_regions(pdev,
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
index ce82e13aa8ae..66b8553cd820 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
@@ -14,6 +14,7 @@
 
 #include "../libwx/wx_type.h"
 #include "../libwx/wx_lib.h"
+#include "../libwx/wx_err.h"
 #include "../libwx/wx_ptp.h"
 #include "../libwx/wx_hw.h"
 #include "../libwx/wx_mbx.h"
@@ -123,6 +124,8 @@ static void txgbe_service_task(struct work_struct *work)
 	txgbe_module_detection_subtask(wx);
 	txgbe_link_config_subtask(wx);
 	wx_update_stats(wx);
+	wx_check_tx_hang_subtask(wx);
+	wx_check_err_subtask(wx);
 
 	wx_service_event_complete(wx);
 }
@@ -224,6 +227,7 @@ static void txgbe_disable_device(struct wx *wx)
 	wx_irq_disable(wx);
 	wx_napi_disable_all(wx);
 
+	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
 	timer_delete_sync(&wx->service_timer);
 	cancel_work_sync(&wx->service_task);
 
@@ -654,6 +658,7 @@ static const struct net_device_ops txgbe_netdev_ops = {
 	.ndo_stop               = txgbe_close,
 	.ndo_change_mtu         = wx_change_mtu,
 	.ndo_start_xmit         = wx_xmit_frame,
+	.ndo_tx_timeout         = wx_tx_timeout,
 	.ndo_set_rx_mode        = wx_set_rx_mode,
 	.ndo_set_features       = wx_set_features,
 	.ndo_fix_features       = wx_fix_features,
@@ -745,6 +750,7 @@ static int txgbe_probe(struct pci_dev *pdev,
 	wx->driver_name = txgbe_driver_name;
 	txgbe_set_ethtool_ops(netdev);
 	netdev->netdev_ops = &txgbe_netdev_ops;
+	netdev->watchdog_timeo = 5 * HZ;
 	netdev->udp_tunnel_nic_info = &txgbe_udp_tunnels;
 
 	/* setup the private structure */
@@ -815,6 +821,10 @@ static int txgbe_probe(struct pci_dev *pdev,
 	eth_hw_addr_set(netdev, wx->mac.perm_addr);
 	wx_mac_set_default_filter(wx, wx->mac.perm_addr);
 
+	err = wx_init_err_task(wx);
+	if (err)
+		goto err_free_mac_table;
+
 	txgbe_init_service(wx);
 
 	err = wx_init_interrupt_scheme(wx);
@@ -917,6 +927,8 @@ static int txgbe_probe(struct pci_dev *pdev,
 err_cancel_service:
 	timer_delete_sync(&wx->service_timer);
 	cancel_work_sync(&wx->service_task);
+	cancel_work_sync(&wx->reset_task);
+	destroy_workqueue(wx->reset_wq);
 err_free_mac_table:
 	kfree(wx->rss_key);
 	kfree(wx->mac_table);
@@ -949,6 +961,8 @@ static void txgbe_remove(struct pci_dev *pdev)
 
 	timer_shutdown_sync(&wx->service_timer);
 	cancel_work_sync(&wx->service_task);
+	cancel_work_sync(&wx->reset_task);
+	destroy_workqueue(wx->reset_wq);
 
 	txgbe_remove_phy(txgbe);
 	wx_free_isb_resources(wx);
-- 
2.51.0

RE: [PATCH net-next v4 2/5] net: wangxun: add Tx timeout process

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Jiawen Wu <jiawenwu@trustnetic.com>
> Sent: Monday, June 1, 2026 9:22 AM
> To: netdev@vger.kernel.org
> Cc: Mengyuan Lou <mengyuanlou@net-swift.com>; Andrew Lunn
> <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>; Eric
> Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo
> Abeni <pabeni@redhat.com>; Richard Cochran <richardcochran@gmail.com>;
> Russell King <linux@armlinux.org.uk>; Keller, Jacob E
> <jacob.e.keller@intel.com>; Michal Swiatkowski
> <michal.swiatkowski@linux.intel.com>; Simon Horman <horms@kernel.org>;
> Kees Cook <kees@kernel.org>; Zaremba, Larysa
> <larysa.zaremba@intel.com>; Ingo Molnar <mingo@kernel.org>; Joe Damato
> <joe@dama.to>; Breno Leitao <leitao@debian.org>; Loktionov, Aleksandr
> <aleksandr.loktionov@intel.com>; Uwe Kleine-König (The Capable Hub)
> <u.kleine-koenig@baylibre.com>; Johannes Berg
> <johannes@sipsolutions.net>; Fabio Baltieri
> <fabio.baltieri@gmail.com>; Jiawen Wu <jiawenwu@trustnetic.com>
> Subject: [PATCH net-next v4 2/5] net: wangxun: add Tx timeout process
> 
> Implement .ndo_tx_timeout to handle Tx side timeout event. When a Tx
> timeout event occur, it will trigger driver into reset process.
> 
> The WX_HANG_CHECK_ARMED bit is set to indicate a potential hang. It
> will be cleared if a pause frame is received to avoid false hang
> detection caused by pause frames.
> 
> Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
> ---
>  drivers/net/ethernet/wangxun/libwx/Makefile   |   2 +-
>  drivers/net/ethernet/wangxun/libwx/wx_err.c   | 170
> ++++++++++++++++++
>  drivers/net/ethernet/wangxun/libwx/wx_err.h   |  16 ++
>  drivers/net/ethernet/wangxun/libwx/wx_hw.c    |  17 +-
>  drivers/net/ethernet/wangxun/libwx/wx_lib.c   |  37 ++++
>  drivers/net/ethernet/wangxun/libwx/wx_type.h  |  19 +-
> drivers/net/ethernet/wangxun/ngbe/ngbe_main.c |  14 ++
>  .../net/ethernet/wangxun/txgbe/txgbe_main.c   |  14 ++
>  8 files changed, 284 insertions(+), 5 deletions(-)  create mode
> 100644 drivers/net/ethernet/wangxun/libwx/wx_err.c
>  create mode 100644 drivers/net/ethernet/wangxun/libwx/wx_err.h
> 
> diff --git a/drivers/net/ethernet/wangxun/libwx/Makefile
> b/drivers/net/ethernet/wangxun/libwx/Makefile
> index a71b0ad77de3..c8724bb129aa 100644
> --- a/drivers/net/ethernet/wangxun/libwx/Makefile
> +++ b/drivers/net/ethernet/wangxun/libwx/Makefile
> @@ -4,5 +4,5 @@
> 
>  obj-$(CONFIG_LIBWX) += libwx.o
> 
> -libwx-objs := wx_hw.o wx_lib.o wx_ethtool.o wx_ptp.o wx_mbx.o
> wx_sriov.o
> +libwx-objs := wx_hw.o wx_lib.o wx_ethtool.o wx_ptp.o wx_mbx.o
> +wx_sriov.o wx_err.o
>  libwx-objs += wx_vf.o wx_vf_lib.o wx_vf_common.o diff --git
> a/drivers/net/ethernet/wangxun/libwx/wx_err.c
> b/drivers/net/ethernet/wangxun/libwx/wx_err.c
> new file mode 100644
> index 000000000000..982a438d009e
> --- /dev/null
> +++ b/drivers/net/ethernet/wangxun/libwx/wx_err.c
> @@ -0,0 +1,170 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2015 - 2026 Beijing WangXun Technology Co., Ltd. */
> +/* Copyright (c) 1999 - 2026 Intel Corporation. */
> +

...


Two functions with the same wx_check_tx_hang() name is not good, at least problems with greps and ctags.

> +static void wx_check_tx_hang(struct wx *wx) {
> +	int i;
> +
> +	/* If we're down or resetting, just bail */
> +	if (!netif_running(wx->netdev) ||
> +	    test_bit(WX_STATE_RESETTING, wx->state))
> +		return;
> +
> +	/* Force detection of hung controller */
> +	if (netif_carrier_ok(wx->netdev)) {
> +		for (i = 0; i < wx->num_tx_queues; i++)
> +			set_bit(WX_TX_DETECT_HANG, wx->tx_ring[i]-
> >state);
> +	}
> +}
> +
> +void wx_check_tx_hang_subtask(struct wx *wx) {
> +	wx_watchdog_flush_tx(wx);
> +	wx_check_tx_hang(wx);
> +}
> +EXPORT_SYMBOL(wx_check_tx_hang_subtask);
> +

...

>  }
> 
>  /**
> diff --git a/drivers/net/ethernet/wangxun/libwx/wx_lib.c
> b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
> index d042567b8128..da4d9e229c9e 100644
> --- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c
> +++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
> @@ -14,6 +14,7 @@
> 
>  #include "wx_type.h"
>  #include "wx_lib.h"

...

Two functions with the same wx_check_tx_hang() name is not good, at least problems with greps and ctags.

> +static bool wx_check_tx_hang(struct wx_ring *ring) {
> +	u32 tx_done_old = ring->tx_stats.tx_done_old;
> +	u32 tx_pending = wx_get_tx_pending(ring);
> +	u32 tx_done = ring->stats.packets;
> +
> +	if (!test_and_clear_bit(WX_TX_DETECT_HANG, ring->state))
> +		return false;
> +
> +	if (tx_done_old == tx_done && tx_pending)
> +		/* make sure it is true for two checks in a row */
> +		return test_and_set_bit(WX_HANG_CHECK_ARMED, ring-
> >state);
> +
> +	/* update completed stats and continue */
> +	ring->tx_stats.tx_done_old = tx_done;
> +	/* reset the countdown */
> +	clear_bit(WX_HANG_CHECK_ARMED, ring->state);
> +
> +	return false;
> +}
> +

...

> 
>  	txgbe_remove_phy(txgbe);
>  	wx_free_isb_resources(wx);
> --
> 2.51.0

[PATCH net-next v4 3/5] net: wangxun: add reinit parameter to wx->do_reset callback

[Jiawen Wu]

To implement a simple hardware reset without tearing down the network
interface state, introduce a boolean 'reinit' parameter to wx->do_reset
callback.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 drivers/net/ethernet/wangxun/libwx/wx_err.c     | 2 +-
 drivers/net/ethernet/wangxun/libwx/wx_ethtool.c | 2 +-
 drivers/net/ethernet/wangxun/libwx/wx_lib.c     | 4 ++--
 drivers/net/ethernet/wangxun/libwx/wx_type.h    | 2 +-
 drivers/net/ethernet/wangxun/ngbe/ngbe_main.c   | 4 ++--
 drivers/net/ethernet/wangxun/ngbe/ngbe_type.h   | 2 +-
 drivers/net/ethernet/wangxun/txgbe/txgbe_main.c | 4 ++--
 drivers/net/ethernet/wangxun/txgbe/txgbe_type.h | 2 +-
 8 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.c b/drivers/net/ethernet/wangxun/libwx/wx_err.c
index 982a438d009e..e249cea874be 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_err.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_err.c
@@ -16,7 +16,7 @@ static void wx_pf_reset_subtask(struct wx *wx)
 
 	wx_warn(wx, "Reset adapter.\n");
 	if (wx->do_reset)
-		wx->do_reset(wx->netdev);
+		wx->do_reset(wx->netdev, true);
 }
 
 static void wx_reset_task(struct work_struct *work)
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c b/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
index 5df971aca9e3..d1356ff5d69b 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
@@ -395,7 +395,7 @@ static void wx_update_rsc(struct wx *wx)
 
 	/* reset the device to apply the new RSC setting */
 	if (need_reset && wx->do_reset)
-		wx->do_reset(netdev);
+		wx->do_reset(netdev, true);
 }
 
 int wx_set_coalesce(struct net_device *netdev,
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_lib.c b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
index da4d9e229c9e..e5a45356ba00 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
@@ -3148,7 +3148,7 @@ int wx_set_features(struct net_device *netdev, netdev_features_t features)
 	netdev->features = features;
 
 	if (changed & NETIF_F_HW_VLAN_CTAG_RX && wx->do_reset)
-		wx->do_reset(netdev);
+		wx->do_reset(netdev, true);
 	else if (changed & (NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_HW_VLAN_CTAG_FILTER))
 		wx_set_rx_mode(netdev);
 
@@ -3198,7 +3198,7 @@ int wx_set_features(struct net_device *netdev, netdev_features_t features)
 
 out:
 	if (need_reset && wx->do_reset)
-		wx->do_reset(netdev);
+		wx->do_reset(netdev, true);
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h b/drivers/net/ethernet/wangxun/libwx/wx_type.h
index 75d74ca2e259..a8b4e84787f4 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
+++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
@@ -1408,7 +1408,7 @@ struct wx {
 	void (*atr)(struct wx_ring *ring, struct wx_tx_buffer *first, u8 ptype);
 	void (*configure_fdir)(struct wx *wx);
 	int (*setup_tc)(struct net_device *netdev, u8 tc);
-	void (*do_reset)(struct net_device *netdev);
+	void (*do_reset)(struct net_device *netdev, bool reinit);
 	int (*ptp_setup_sdp)(struct wx *wx);
 	void (*set_num_queues)(struct wx *wx);
 
diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
index 9aae0429995d..3dc8342dd3a7 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
@@ -633,11 +633,11 @@ static void ngbe_reinit_locked(struct wx *wx)
 	mutex_unlock(&wx->reset_lock);
 }
 
-void ngbe_do_reset(struct net_device *netdev)
+void ngbe_do_reset(struct net_device *netdev, bool reinit)
 {
 	struct wx *wx = netdev_priv(netdev);
 
-	if (netif_running(netdev))
+	if (netif_running(netdev) && reinit)
 		ngbe_reinit_locked(wx);
 	else
 		ngbe_reset(wx);
diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h b/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h
index 4f648f272c08..c9233dc7ae50 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_type.h
@@ -125,6 +125,6 @@ extern char ngbe_driver_name[];
 void ngbe_down(struct wx *wx);
 void ngbe_up(struct wx *wx);
 int ngbe_setup_tc(struct net_device *dev, u8 tc);
-void ngbe_do_reset(struct net_device *netdev);
+void ngbe_do_reset(struct net_device *netdev, bool reinit);
 
 #endif /* _NGBE_TYPE_H_ */
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
index 66b8553cd820..b37c9ed57cf7 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
@@ -610,11 +610,11 @@ static void txgbe_reinit_locked(struct wx *wx)
 	mutex_unlock(&wx->reset_lock);
 }
 
-void txgbe_do_reset(struct net_device *netdev)
+void txgbe_do_reset(struct net_device *netdev, bool reinit)
 {
 	struct wx *wx = netdev_priv(netdev);
 
-	if (netif_running(netdev))
+	if (netif_running(netdev) && reinit)
 		txgbe_reinit_locked(wx);
 	else
 		txgbe_reset(wx);
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
index 6b05f32b4a01..1e373f7fd9b5 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
@@ -313,7 +313,7 @@ extern char txgbe_driver_name[];
 void txgbe_down(struct wx *wx);
 void txgbe_up(struct wx *wx);
 int txgbe_setup_tc(struct net_device *dev, u8 tc);
-void txgbe_do_reset(struct net_device *netdev);
+void txgbe_do_reset(struct net_device *netdev, bool reinit);
 
 #define TXGBE_LINK_SPEED_UNKNOWN        0
 #define TXGBE_LINK_SPEED_10GB_FULL      4
-- 
2.51.0

RE: [PATCH net-next v4 3/5] net: wangxun: add reinit parameter to wx->do_reset callback

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Jiawen Wu <jiawenwu@trustnetic.com>
> Sent: Monday, June 1, 2026 9:22 AM
> To: netdev@vger.kernel.org
> Cc: Mengyuan Lou <mengyuanlou@net-swift.com>; Andrew Lunn
> <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>; Eric
> Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo
> Abeni <pabeni@redhat.com>; Richard Cochran <richardcochran@gmail.com>;
> Russell King <linux@armlinux.org.uk>; Keller, Jacob E
> <jacob.e.keller@intel.com>; Michal Swiatkowski
> <michal.swiatkowski@linux.intel.com>; Simon Horman <horms@kernel.org>;
> Kees Cook <kees@kernel.org>; Zaremba, Larysa
> <larysa.zaremba@intel.com>; Ingo Molnar <mingo@kernel.org>; Joe Damato
> <joe@dama.to>; Breno Leitao <leitao@debian.org>; Loktionov, Aleksandr
> <aleksandr.loktionov@intel.com>; Uwe Kleine-König (The Capable Hub)
> <u.kleine-koenig@baylibre.com>; Johannes Berg
> <johannes@sipsolutions.net>; Fabio Baltieri
> <fabio.baltieri@gmail.com>; Jiawen Wu <jiawenwu@trustnetic.com>
> Subject: [PATCH net-next v4 3/5] net: wangxun: add reinit parameter to
> wx->do_reset callback
> 
> To implement a simple hardware reset without tearing down the network
> interface state, introduce a boolean 'reinit' parameter to wx-
> >do_reset callback.
> 
> Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
> ---
>  drivers/net/ethernet/wangxun/libwx/wx_err.c     | 2 +-
>  drivers/net/ethernet/wangxun/libwx/wx_ethtool.c | 2 +-
>  drivers/net/ethernet/wangxun/libwx/wx_lib.c     | 4 ++--
>  drivers/net/ethernet/wangxun/libwx/wx_type.h    | 2 +-
>  drivers/net/ethernet/wangxun/ngbe/ngbe_main.c   | 4 ++--
>  drivers/net/ethernet/wangxun/ngbe/ngbe_type.h   | 2 +-
>  drivers/net/ethernet/wangxun/txgbe/txgbe_main.c | 4 ++--
> drivers/net/ethernet/wangxun/txgbe/txgbe_type.h | 2 +-
>  8 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.c
> b/drivers/net/ethernet/wangxun/libwx/wx_err.c
> index 982a438d009e..e249cea874be 100644
> --- a/drivers/net/ethernet/wangxun/libwx/wx_err.c
> +++ b/drivers/net/ethernet/wangxun/libwx/wx_err.c
> @@ -16,7 +16,7 @@ static void wx_pf_reset_subtask(struct wx *wx)
> 
>  	wx_warn(wx, "Reset adapter.\n");
>  	if (wx->do_reset)
> -		wx->do_reset(wx->netdev);
> +		wx->do_reset(wx->netdev, true);
>  }
> 


...

>  		txgbe_reinit_locked(wx);
>  	else
>  		txgbe_reset(wx);
> diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
> b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
> index 6b05f32b4a01..1e373f7fd9b5 100644
> --- a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
> +++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
> @@ -313,7 +313,7 @@ extern char txgbe_driver_name[];  void
> txgbe_down(struct wx *wx);  void txgbe_up(struct wx *wx);  int
> txgbe_setup_tc(struct net_device *dev, u8 tc); -void
> txgbe_do_reset(struct net_device *netdev);
> +void txgbe_do_reset(struct net_device *netdev, bool reinit);
> 
>  #define TXGBE_LINK_SPEED_UNKNOWN        0
>  #define TXGBE_LINK_SPEED_10GB_FULL      4
> --
> 2.51.0

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>

[PATCH net-next v4 4/5] net: wangxun: introduce soft quiesce callbacks for AER recovery

[Jiawen Wu]

Introduce device-specific soft quiesce callbacks for ngbe and txgbe to
provide a lightweight shutdown path during PCI error recovery. It avoids
MMIO-dependent operations in PCI error status, for the later
implementation of PCIe error callback function in libwx.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 drivers/net/ethernet/wangxun/libwx/wx_type.h  |  1 +
 drivers/net/ethernet/wangxun/ngbe/ngbe_main.c | 23 +++++++++++++++++++
 .../net/ethernet/wangxun/txgbe/txgbe_main.c   | 22 ++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h b/drivers/net/ethernet/wangxun/libwx/wx_type.h
index a8b4e84787f4..1b25a52188f7 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
+++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
@@ -1409,6 +1409,7 @@ struct wx {
 	void (*configure_fdir)(struct wx *wx);
 	int (*setup_tc)(struct net_device *netdev, u8 tc);
 	void (*do_reset)(struct net_device *netdev, bool reinit);
+	void (*soft_quiesce)(struct wx *wx);
 	int (*ptp_setup_sdp)(struct wx *wx);
 	void (*set_num_queues)(struct wx *wx);
 
diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
index 3dc8342dd3a7..2484d3177034 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
@@ -47,6 +47,28 @@ static const struct pci_device_id ngbe_pci_tbl[] = {
 	{ }
 };
 
+static void ngbe_soft_quiesce(struct wx *wx)
+{
+	if (test_and_set_bit(WX_STATE_DOWN, wx->state))
+		return;
+
+	wx_ptp_stop(wx);
+	phylink_stop(wx->phylink);
+	pci_clear_master(wx->pdev);
+	wx_napi_disable_all(wx);
+
+	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
+	timer_delete_sync(&wx->service_timer);
+
+	wx_clean_all_tx_rings(wx);
+	wx_clean_all_rx_rings(wx);
+
+	wx_free_irq(wx);
+	wx_free_isb_resources(wx);
+	wx_free_resources(wx);
+	phylink_disconnect_phy(wx->phylink);
+}
+
 /**
  *  ngbe_init_type_code - Initialize the shared code
  *  @wx: pointer to hardware structure
@@ -135,6 +157,7 @@ static int ngbe_sw_init(struct wx *wx)
 	wx->mbx.size = WX_VXMAILBOX_SIZE;
 	wx->setup_tc = ngbe_setup_tc;
 	wx->do_reset = ngbe_do_reset;
+	wx->soft_quiesce = ngbe_soft_quiesce;
 	set_bit(0, &wx->fwd_bitmask);
 
 	return 0;
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
index b37c9ed57cf7..816aba4a9099 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
@@ -296,6 +296,27 @@ void txgbe_up(struct wx *wx)
 	txgbe_up_complete(wx);
 }
 
+static void txgbe_soft_quiesce(struct wx *wx)
+{
+	if (test_and_set_bit(WX_STATE_DOWN, wx->state))
+		return;
+
+	wx_ptp_stop(wx);
+	phylink_stop(wx->phylink);
+	pci_clear_master(wx->pdev);
+	wx_napi_disable_all(wx);
+
+	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
+	timer_delete_sync(&wx->service_timer);
+
+	wx_clean_all_tx_rings(wx);
+	wx_clean_all_rx_rings(wx);
+
+	wx_free_irq(wx);
+	txgbe_free_misc_irq(wx->priv);
+	wx_free_resources(wx);
+}
+
 /**
  *  txgbe_init_type_code - Initialize the shared code
  *  @wx: pointer to hardware structure
@@ -412,6 +433,7 @@ static int txgbe_sw_init(struct wx *wx)
 
 	wx->setup_tc = txgbe_setup_tc;
 	wx->do_reset = txgbe_do_reset;
+	wx->soft_quiesce = txgbe_soft_quiesce;
 	set_bit(0, &wx->fwd_bitmask);
 
 	switch (wx->mac.type) {
-- 
2.51.0

RE: [PATCH net-next v4 4/5] net: wangxun: introduce soft quiesce callbacks for AER recovery

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Jiawen Wu <jiawenwu@trustnetic.com>
> Sent: Monday, June 1, 2026 9:22 AM
> To: netdev@vger.kernel.org
> Cc: Mengyuan Lou <mengyuanlou@net-swift.com>; Andrew Lunn
> <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>; Eric
> Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo
> Abeni <pabeni@redhat.com>; Richard Cochran <richardcochran@gmail.com>;
> Russell King <linux@armlinux.org.uk>; Keller, Jacob E
> <jacob.e.keller@intel.com>; Michal Swiatkowski
> <michal.swiatkowski@linux.intel.com>; Simon Horman <horms@kernel.org>;
> Kees Cook <kees@kernel.org>; Zaremba, Larysa
> <larysa.zaremba@intel.com>; Ingo Molnar <mingo@kernel.org>; Joe Damato
> <joe@dama.to>; Breno Leitao <leitao@debian.org>; Loktionov, Aleksandr
> <aleksandr.loktionov@intel.com>; Uwe Kleine-König (The Capable Hub)
> <u.kleine-koenig@baylibre.com>; Johannes Berg
> <johannes@sipsolutions.net>; Fabio Baltieri
> <fabio.baltieri@gmail.com>; Jiawen Wu <jiawenwu@trustnetic.com>
> Subject: [PATCH net-next v4 4/5] net: wangxun: introduce soft quiesce
> callbacks for AER recovery
> 
> Introduce device-specific soft quiesce callbacks for ngbe and txgbe to
> provide a lightweight shutdown path during PCI error recovery. It
> avoids MMIO-dependent operations in PCI error status, for the later
> implementation of PCIe error callback function in libwx.
> 
> Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
> ---
>  drivers/net/ethernet/wangxun/libwx/wx_type.h  |  1 +
> drivers/net/ethernet/wangxun/ngbe/ngbe_main.c | 23 +++++++++++++++++++
>  .../net/ethernet/wangxun/txgbe/txgbe_main.c   | 22 ++++++++++++++++++
>  3 files changed, 46 insertions(+)
> 
> diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h
> b/drivers/net/ethernet/wangxun/libwx/wx_type.h
> index a8b4e84787f4..1b25a52188f7 100644
> --- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
> +++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
> @@ -1409,6 +1409,7 @@ struct wx {
>  	void (*configure_fdir)(struct wx *wx);
>  	int (*setup_tc)(struct net_device *netdev, u8 tc);
>  	void (*do_reset)(struct net_device *netdev, bool reinit);
> +	void (*soft_quiesce)(struct wx *wx);
>  	int (*ptp_setup_sdp)(struct wx *wx);
>  	void (*set_num_queues)(struct wx *wx);
> 
> diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> index 3dc8342dd3a7..2484d3177034 100644
> --- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> +++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> @@ -47,6 +47,28 @@ static const struct pci_device_id ngbe_pci_tbl[] =
> {
>  	{ }
>  };
> 
> +static void ngbe_soft_quiesce(struct wx *wx) {
> +	if (test_and_set_bit(WX_STATE_DOWN, wx->state))
> +		return;
> +
> +	wx_ptp_stop(wx);
> +	phylink_stop(wx->phylink);
> +	pci_clear_master(wx->pdev);
> +	wx_napi_disable_all(wx);
> +
> +	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
> +	timer_delete_sync(&wx->service_timer);
> +
> +	wx_clean_all_tx_rings(wx);
> +	wx_clean_all_rx_rings(wx);
> +
> +	wx_free_irq(wx);
> +	wx_free_isb_resources(wx);
> +	wx_free_resources(wx);
> +	phylink_disconnect_phy(wx->phylink);
> +}
> +
>  /**
>   *  ngbe_init_type_code - Initialize the shared code
>   *  @wx: pointer to hardware structure
> @@ -135,6 +157,7 @@ static int ngbe_sw_init(struct wx *wx)
>  	wx->mbx.size = WX_VXMAILBOX_SIZE;
>  	wx->setup_tc = ngbe_setup_tc;
>  	wx->do_reset = ngbe_do_reset;
> +	wx->soft_quiesce = ngbe_soft_quiesce;
>  	set_bit(0, &wx->fwd_bitmask);
> 
>  	return 0;
> diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> index b37c9ed57cf7..816aba4a9099 100644
> --- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> +++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> @@ -296,6 +296,27 @@ void txgbe_up(struct wx *wx)
>  	txgbe_up_complete(wx);
>  }
> 
> +static void txgbe_soft_quiesce(struct wx *wx) {
> +	if (test_and_set_bit(WX_STATE_DOWN, wx->state))
> +		return;
> +
> +	wx_ptp_stop(wx);
> +	phylink_stop(wx->phylink);
> +	pci_clear_master(wx->pdev);
> +	wx_napi_disable_all(wx);
> +
> +	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
> +	timer_delete_sync(&wx->service_timer);
> +
> +	wx_clean_all_tx_rings(wx);
> +	wx_clean_all_rx_rings(wx);
> +
> +	wx_free_irq(wx);
> +	txgbe_free_misc_irq(wx->priv);
I think wx_free_isb_resources(wx) is missed here, what Sashiko says?
I fill like phylink_disconnect_phy() too.

Can you prove there is no ISB resources leak?

> +	wx_free_resources(wx);
> +}
> +
>  /**
>   *  txgbe_init_type_code - Initialize the shared code
>   *  @wx: pointer to hardware structure
> @@ -412,6 +433,7 @@ static int txgbe_sw_init(struct wx *wx)
> 
>  	wx->setup_tc = txgbe_setup_tc;
>  	wx->do_reset = txgbe_do_reset;
> +	wx->soft_quiesce = txgbe_soft_quiesce;
>  	set_bit(0, &wx->fwd_bitmask);
> 
>  	switch (wx->mac.type) {
> --
> 2.51.0

RE: [PATCH net-next v4 4/5] net: wangxun: introduce soft quiesce callbacks for AER recovery

[Jiawen Wu]

> > diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > index b37c9ed57cf7..816aba4a9099 100644
> > --- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > +++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
> > @@ -296,6 +296,27 @@ void txgbe_up(struct wx *wx)
> >  	txgbe_up_complete(wx);
> >  }
> >
> > +static void txgbe_soft_quiesce(struct wx *wx) {
> > +	if (test_and_set_bit(WX_STATE_DOWN, wx->state))
> > +		return;
> > +
> > +	wx_ptp_stop(wx);
> > +	phylink_stop(wx->phylink);
> > +	pci_clear_master(wx->pdev);
> > +	wx_napi_disable_all(wx);
> > +
> > +	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
> > +	timer_delete_sync(&wx->service_timer);
> > +
> > +	wx_clean_all_tx_rings(wx);
> > +	wx_clean_all_rx_rings(wx);
> > +
> > +	wx_free_irq(wx);
> > +	txgbe_free_misc_irq(wx->priv);
> I think wx_free_isb_resources(wx) is missed here, what Sashiko says?
> I fill like phylink_disconnect_phy() too.
> 
> Can you prove there is no ISB resources leak?

TXGBE is different from NGBE, wx_free_isb_resources() and phylink_disconnect_phy()
are not on the close path for TXGBE.

> 
> > +	wx_free_resources(wx);
> > +}
> > +
> >  /**
> >   *  txgbe_init_type_code - Initialize the shared code
> >   *  @wx: pointer to hardware structure
> > @@ -412,6 +433,7 @@ static int txgbe_sw_init(struct wx *wx)
> >
> >  	wx->setup_tc = txgbe_setup_tc;
> >  	wx->do_reset = txgbe_do_reset;
> > +	wx->soft_quiesce = txgbe_soft_quiesce;
> >  	set_bit(0, &wx->fwd_bitmask);
> >
> >  	switch (wx->mac.type) {
> > --
> > 2.51.0
> 
> 

RE: [PATCH net-next v4 4/5] net: wangxun: introduce soft quiesce callbacks for AER recovery

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Jiawen Wu <jiawenwu@trustnetic.com>
> Sent: Monday, June 1, 2026 9:22 AM
> To: netdev@vger.kernel.org
> Cc: Mengyuan Lou <mengyuanlou@net-swift.com>; Andrew Lunn
> <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>; Eric
> Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo
> Abeni <pabeni@redhat.com>; Richard Cochran <richardcochran@gmail.com>;
> Russell King <linux@armlinux.org.uk>; Keller, Jacob E
> <jacob.e.keller@intel.com>; Michal Swiatkowski
> <michal.swiatkowski@linux.intel.com>; Simon Horman <horms@kernel.org>;
> Kees Cook <kees@kernel.org>; Zaremba, Larysa
> <larysa.zaremba@intel.com>; Ingo Molnar <mingo@kernel.org>; Joe Damato
> <joe@dama.to>; Breno Leitao <leitao@debian.org>; Loktionov, Aleksandr
> <aleksandr.loktionov@intel.com>; Uwe Kleine-König (The Capable Hub)
> <u.kleine-koenig@baylibre.com>; Johannes Berg
> <johannes@sipsolutions.net>; Fabio Baltieri
> <fabio.baltieri@gmail.com>; Jiawen Wu <jiawenwu@trustnetic.com>
> Subject: [PATCH net-next v4 4/5] net: wangxun: introduce soft quiesce
> callbacks for AER recovery
> 
> Introduce device-specific soft quiesce callbacks for ngbe and txgbe to
> provide a lightweight shutdown path during PCI error recovery. It
> avoids MMIO-dependent operations in PCI error status, for the later
> implementation of PCIe error callback function in libwx.
> 
> Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
> ---
>  drivers/net/ethernet/wangxun/libwx/wx_type.h  |  1 +
> drivers/net/ethernet/wangxun/ngbe/ngbe_main.c | 23 +++++++++++++++++++
>  .../net/ethernet/wangxun/txgbe/txgbe_main.c   | 22 ++++++++++++++++++
>  3 files changed, 46 insertions(+)
> 
> diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h
> b/drivers/net/ethernet/wangxun/libwx/wx_type.h
> index a8b4e84787f4..1b25a52188f7 100644
> --- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
> +++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
> @@ -1409,6 +1409,7 @@ struct wx {
>  	void (*configure_fdir)(struct wx *wx);
>  	int (*setup_tc)(struct net_device *netdev, u8 tc);
>  	void (*do_reset)(struct net_device *netdev, bool reinit);
> +	void (*soft_quiesce)(struct wx *wx);
>  	int (*ptp_setup_sdp)(struct wx *wx);
>  	void (*set_num_queues)(struct wx *wx);
> 
> diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> index 3dc8342dd3a7..2484d3177034 100644
> --- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> +++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
> @@ -47,6 +47,28 @@ static const struct pci_device_id ngbe_pci_tbl[] =
> {
>  	{ }
>  };
> 
> +static void ngbe_soft_quiesce(struct wx *wx) {
> +	if (test_and_set_bit(WX_STATE_DOWN, wx->state))
> +		return;
> +
> +	wx_ptp_stop(wx);
> +	phylink_stop(wx->phylink);
> +	pci_clear_master(wx->pdev);
> +	wx_napi_disable_all(wx);
> +
> +	clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags);
> +	timer_delete_sync(&wx->service_timer);
Can you exlplain how do you handle service_task work item that was ALREADY QUEUED before
timer_delete_sync()? Because they are NOT cancelled here.

> +
> +	wx_clean_all_tx_rings(wx);
> +	wx_clean_all_rx_rings(wx);
> +
> +	wx_free_irq(wx);
> +	wx_free_isb_resources(wx);
> +	wx_free_resources(wx);
> +	phylink_disconnect_phy(wx->phylink);
> +}

...

>  /**
>   *  txgbe_init_type_code - Initialize the shared code
>   *  @wx: pointer to hardware structure
> @@ -412,6 +433,7 @@ static int txgbe_sw_init(struct wx *wx)
> 
>  	wx->setup_tc = txgbe_setup_tc;
>  	wx->do_reset = txgbe_do_reset;
> +	wx->soft_quiesce = txgbe_soft_quiesce;
>  	set_bit(0, &wx->fwd_bitmask);
> 
>  	switch (wx->mac.type) {
> --
> 2.51.0

[PATCH net-next v4 5/5] net: wangxun: implement pci_error_handlers ops

[Jiawen Wu]

Support AER driver to handle the PCIe errors.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 drivers/net/ethernet/wangxun/libwx/wx_err.c   | 111 ++++++++++++++++++
 drivers/net/ethernet/wangxun/libwx/wx_err.h   |   2 +
 drivers/net/ethernet/wangxun/libwx/wx_type.h  |   1 +
 drivers/net/ethernet/wangxun/ngbe/ngbe_main.c |   9 +-
 .../net/ethernet/wangxun/txgbe/txgbe_main.c   |   8 +-
 5 files changed, 127 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.c b/drivers/net/ethernet/wangxun/libwx/wx_err.c
index e249cea874be..ae5d14071f3d 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_err.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_err.c
@@ -4,11 +4,122 @@
 
 #include <linux/netdevice.h>
 #include <linux/pci.h>
+#include <linux/aer.h>
 
 #include "wx_type.h"
 #include "wx_lib.h"
 #include "wx_err.h"
 
+/**
+ * wx_io_error_detected - called when PCI error is detected
+ * @pdev: Pointer to PCI device
+ * @state: The current pci connection state
+ *
+ * Return: pci_ers_result_t.
+ *
+ * This function is called after a PCI bus error affecting
+ * this device has been detected.
+ */
+static pci_ers_result_t wx_io_error_detected(struct pci_dev *pdev,
+					     pci_channel_state_t state)
+{
+	struct wx *wx = pci_get_drvdata(pdev);
+	struct net_device *netdev;
+
+	if (!wx)
+		return PCI_ERS_RESULT_DISCONNECT;
+
+	netdev = wx->netdev;
+	if (!netif_device_present(netdev))
+		return PCI_ERS_RESULT_DISCONNECT;
+
+	if (state == pci_channel_io_perm_failure)
+		return PCI_ERS_RESULT_DISCONNECT;
+
+	rtnl_lock();
+	netif_device_detach(netdev);
+
+	if (netif_running(netdev) && wx->soft_quiesce)
+		wx->soft_quiesce(wx);
+
+	if (!test_and_set_bit(WX_STATE_DISABLED, wx->state))
+		pci_disable_device(pdev);
+	rtnl_unlock();
+
+	/* Request a slot reset. */
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * wx_io_slot_reset - called after the pci bus has been reset.
+ * @pdev: Pointer to PCI device
+ *
+ * Return: pci_ers_result_t.
+ *
+ * Restart the card from scratch, as if from a cold-boot.
+ */
+static pci_ers_result_t wx_io_slot_reset(struct pci_dev *pdev)
+{
+	struct wx *wx = pci_get_drvdata(pdev);
+	pci_ers_result_t result;
+
+	if (pci_enable_device_mem(pdev)) {
+		wx_err(wx, "Cannot re-enable PCI device after reset.\n");
+		result = PCI_ERS_RESULT_DISCONNECT;
+	} else {
+		/* make all memory operations done before clearing the flag */
+		smp_mb__before_atomic();
+		clear_bit(WX_STATE_DISABLED, wx->state);
+		pci_set_master(pdev);
+		pci_restore_state(pdev);
+		pci_wake_from_d3(pdev, false);
+
+		rtnl_lock();
+		if (wx->do_reset)
+			wx->do_reset(wx->netdev, false);
+		rtnl_unlock();
+		result = PCI_ERS_RESULT_RECOVERED;
+	}
+
+	pci_aer_clear_nonfatal_status(pdev);
+
+	return result;
+}
+
+/**
+ * wx_io_resume - called when traffic can start flowing again.
+ * @pdev: Pointer to PCI device
+ *
+ * This callback is called when the error recovery driver tells us that
+ * its OK to resume normal operation.
+ */
+static void wx_io_resume(struct pci_dev *pdev)
+{
+	struct wx *wx = pci_get_drvdata(pdev);
+	struct net_device *netdev;
+	int err;
+
+	netdev = wx->netdev;
+	rtnl_lock();
+	if (netif_running(netdev)) {
+		err = netdev->netdev_ops->ndo_open(netdev);
+		if (err) {
+			wx_err(wx, "Failed to open netdev after reset\n");
+			goto out;
+		}
+	}
+	netif_device_attach(netdev);
+out:
+	rtnl_unlock();
+}
+
+const struct pci_error_handlers wx_err_handler = {
+	.error_detected = wx_io_error_detected,
+	.slot_reset = wx_io_slot_reset,
+	.resume = wx_io_resume,
+};
+EXPORT_SYMBOL(wx_err_handler);
+
 static void wx_pf_reset_subtask(struct wx *wx)
 {
 	if (!test_and_clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags))
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.h b/drivers/net/ethernet/wangxun/libwx/wx_err.h
index a529bf54eeac..de5d02316230 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_err.h
+++ b/drivers/net/ethernet/wangxun/libwx/wx_err.h
@@ -7,6 +7,8 @@
 #ifndef _WX_ERR_H_
 #define _WX_ERR_H_
 
+extern const struct pci_error_handlers wx_err_handler;
+
 void wx_check_err_subtask(struct wx *wx);
 int wx_init_err_task(struct wx *wx);
 void wx_check_tx_hang_subtask(struct wx *wx);
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_type.h b/drivers/net/ethernet/wangxun/libwx/wx_type.h
index 1b25a52188f7..778e186e4555 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_type.h
+++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h
@@ -1221,6 +1221,7 @@ enum wx_state {
 	WX_STATE_PTP_RUNNING,
 	WX_STATE_PTP_TX_IN_PROGRESS,
 	WX_STATE_SERVICE_SCHED,
+	WX_STATE_DISABLED,
 	WX_STATE_NBITS		/* must be last */
 };
 
diff --git a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
index 2484d3177034..8e5a708ea809 100644
--- a/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
+++ b/drivers/net/ethernet/wangxun/ngbe/ngbe_main.c
@@ -589,7 +589,8 @@ static void ngbe_dev_shutdown(struct pci_dev *pdev, bool *enable_wake)
 	*enable_wake = !!wufc;
 	wx_control_hw(wx, false);
 
-	pci_disable_device(pdev);
+	if (!test_and_set_bit(WX_STATE_DISABLED, wx->state))
+		pci_disable_device(pdev);
 }
 
 static void ngbe_shutdown(struct pci_dev *pdev)
@@ -879,6 +880,7 @@ static int ngbe_probe(struct pci_dev *pdev,
 		goto err_register;
 
 	pci_set_drvdata(pdev, wx);
+	pci_save_state(pdev);
 
 	return 0;
 
@@ -934,7 +936,8 @@ static void ngbe_remove(struct pci_dev *pdev)
 	kfree(wx->mac_table);
 	wx_clear_interrupt_scheme(wx);
 
-	pci_disable_device(pdev);
+	if (!test_and_set_bit(WX_STATE_DISABLED, wx->state))
+		pci_disable_device(pdev);
 }
 
 static int ngbe_suspend(struct pci_dev *pdev, pm_message_t state)
@@ -961,6 +964,7 @@ static int ngbe_resume(struct pci_dev *pdev)
 		wx_err(wx, "Cannot enable PCI device from suspend\n");
 		return err;
 	}
+	clear_bit(WX_STATE_DISABLED, wx->state);
 	pci_set_master(pdev);
 	device_wakeup_disable(&pdev->dev);
 
@@ -985,6 +989,7 @@ static struct pci_driver ngbe_driver = {
 	.resume   = ngbe_resume,
 	.shutdown = ngbe_shutdown,
 	.sriov_configure = wx_pci_sriov_configure,
+	.err_handler = &wx_err_handler,
 };
 
 module_pci_driver(ngbe_driver);
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
index 816aba4a9099..e913e3553ced 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
@@ -570,7 +570,8 @@ static void txgbe_dev_shutdown(struct pci_dev *pdev)
 
 	wx_control_hw(wx, false);
 
-	pci_disable_device(pdev);
+	if (!test_and_set_bit(WX_STATE_DISABLED, wx->state))
+		pci_disable_device(pdev);
 }
 
 static void txgbe_shutdown(struct pci_dev *pdev)
@@ -922,6 +923,7 @@ static int txgbe_probe(struct pci_dev *pdev,
 		goto err_remove_phy;
 
 	pci_set_drvdata(pdev, wx);
+	pci_save_state(pdev);
 
 	netif_tx_stop_all_queues(netdev);
 
@@ -996,7 +998,8 @@ static void txgbe_remove(struct pci_dev *pdev)
 	kfree(wx->mac_table);
 	wx_clear_interrupt_scheme(wx);
 
-	pci_disable_device(pdev);
+	if (!test_and_set_bit(WX_STATE_DISABLED, wx->state))
+		pci_disable_device(pdev);
 }
 
 static struct pci_driver txgbe_driver = {
@@ -1006,6 +1009,7 @@ static struct pci_driver txgbe_driver = {
 	.remove   = txgbe_remove,
 	.shutdown = txgbe_shutdown,
 	.sriov_configure = wx_pci_sriov_configure,
+	.err_handler = &wx_err_handler,
 };
 
 module_pci_driver(txgbe_driver);
-- 
2.51.0

RE: [PATCH net-next v4 5/5] net: wangxun: implement pci_error_handlers ops

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Jiawen Wu <jiawenwu@trustnetic.com>
> Sent: Monday, June 1, 2026 9:22 AM
> To: netdev@vger.kernel.org
> Cc: Mengyuan Lou <mengyuanlou@net-swift.com>; Andrew Lunn
> <andrew+netdev@lunn.ch>; David S. Miller <davem@davemloft.net>; Eric
> Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo
> Abeni <pabeni@redhat.com>; Richard Cochran <richardcochran@gmail.com>;
> Russell King <linux@armlinux.org.uk>; Keller, Jacob E
> <jacob.e.keller@intel.com>; Michal Swiatkowski
> <michal.swiatkowski@linux.intel.com>; Simon Horman <horms@kernel.org>;
> Kees Cook <kees@kernel.org>; Zaremba, Larysa
> <larysa.zaremba@intel.com>; Ingo Molnar <mingo@kernel.org>; Joe Damato
> <joe@dama.to>; Breno Leitao <leitao@debian.org>; Loktionov, Aleksandr
> <aleksandr.loktionov@intel.com>; Uwe Kleine-König (The Capable Hub)
> <u.kleine-koenig@baylibre.com>; Johannes Berg
> <johannes@sipsolutions.net>; Fabio Baltieri
> <fabio.baltieri@gmail.com>; Jiawen Wu <jiawenwu@trustnetic.com>
> Subject: [PATCH net-next v4 5/5] net: wangxun: implement
> pci_error_handlers ops
> 
> Support AER driver to handle the PCIe errors.
> 
> Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
> ---
>  drivers/net/ethernet/wangxun/libwx/wx_err.c   | 111
> ++++++++++++++++++
>  drivers/net/ethernet/wangxun/libwx/wx_err.h   |   2 +
>  drivers/net/ethernet/wangxun/libwx/wx_type.h  |   1 +
>  drivers/net/ethernet/wangxun/ngbe/ngbe_main.c |   9 +-
>  .../net/ethernet/wangxun/txgbe/txgbe_main.c   |   8 +-
>  5 files changed, 127 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.c
> b/drivers/net/ethernet/wangxun/libwx/wx_err.c
> index e249cea874be..ae5d14071f3d 100644
> --- a/drivers/net/ethernet/wangxun/libwx/wx_err.c
> +++ b/drivers/net/ethernet/wangxun/libwx/wx_err.c
> @@ -4,11 +4,122 @@
> 
>  #include <linux/netdevice.h>
>  #include <linux/pci.h>
> +#include <linux/aer.h>
> 
>  #include "wx_type.h"
>  #include "wx_lib.h"
>  #include "wx_err.h"
> 

...

> +
> +/**
> + * wx_io_resume - called when traffic can start flowing again.
> + * @pdev: Pointer to PCI device
> + *
> + * This callback is called when the error recovery driver tells us
> that
> + * its OK to resume normal operation.
> + */
> +static void wx_io_resume(struct pci_dev *pdev)
> +{
> +	struct wx *wx = pci_get_drvdata(pdev);
> +	struct net_device *netdev;
> +	int err;
> +
> +	netdev = wx->netdev;
> +	rtnl_lock();
> +	if (netif_running(netdev)) {
> +		err = netdev->netdev_ops->ndo_open(netdev);
> +		if (err) {
> +			wx_err(wx, "Failed to open netdev after
> reset\n");
If you jump over the netif_device_attach(netdev); 
I'm afraid the interface probably will be UP (IFF_UP set, because netif_running() returned true)
but permanently "detached" - the kernel's watchdog, TX queue wakeups,
and carrier-change notifications all check netif_device_present() and 
will silently no-op.

> +			goto out;
> +		}
> +	}
> +	netif_device_attach(netdev);
> +out:
> +	rtnl_unlock();
> +}
> +
> +const struct pci_error_handlers wx_err_handler = {
> +	.error_detected = wx_io_error_detected,
> +	.slot_reset = wx_io_slot_reset,
> +	.resume = wx_io_resume,
> +};
> +EXPORT_SYMBOL(wx_err_handler);
> +
>  static void wx_pf_reset_subtask(struct wx *wx)
>  {
>  	if (!test_and_clear_bit(WX_FLAG_NEED_PF_RESET, wx->flags))
> diff --git a/drivers/net/ethernet/wangxun/libwx/wx_err.h
> b/drivers/net/ethernet/wangxun/libwx/wx_err.h
> index a529bf54eeac..de5d02316230 100644
> --- a/drivers/net/ethernet/wangxun/libwx/wx_err.h
> +++ b/drivers/net/ethernet/wangxun/libwx/wx_err.h
> @@ -7,6 +7,8 @@
>  #ifndef _WX_ERR_H_
>  #define _WX_ERR_H_
> 

...

>  };
> 
>  module_pci_driver(txgbe_driver);
> --
> 2.51.0