netdev - [PATCH net-next v2] r8169: reset bus if NIC isn't accessible after tx timeout

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Message-ID: <4534318d-b679-9399-e410-8aee2a9cbf58@gmail.com>
Date:   Fri, 13 Jan 2023 23:46:19 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexander Duyck <alexander.duyck@...il.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next v2] r8169: reset bus if NIC isn't accessible after tx
 timeout

ASPM issues may result in the NIC not being accessible any longer.
In this case disabling ASPM may not work. Therefore detect this case
by checking whether register reads return ~0, and try to make the
NIC accessible again by resetting the secondary bus.

v2:
- add exception handling for the case that pci_reset_bus() fails

Suggested-by: Alexander Duyck <alexander.duyck@...il.com>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 49c124d8e..02ef98a95 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4535,6 +4535,16 @@ static void rtl_task(struct work_struct *work)
 		goto out_unlock;
 
 	if (test_and_clear_bit(RTL_FLAG_TASK_TX_TIMEOUT, tp->wk.flags)) {
+		/* if chip isn't accessible, reset bus to revive it */
+		if (RTL_R32(tp, TxConfig) == ~0) {
+			ret = pci_reset_bus(tp->pci_dev);
+			if (ret < 0) {
+				netdev_err(tp->dev, "Can't reset secondary PCI bus, detach NIC\n");
+				netif_device_detach(tp->dev);
+				goto out_unlock;
+			}
+		}
+
 		/* ASPM compatibility issues are a typical reason for tx timeouts */
 		ret = pci_disable_link_state(tp->pci_dev, PCIE_LINK_STATE_L1 |
 							  PCIE_LINK_STATE_L0S);
-- 
2.39.0