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Date: Wed, 1 Nov 2017 22:47:19 +0800
From: Lipeng <lipeng321@...wei.com>
To: <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linuxarm@...wei.com>, <yisen.zhuang@...wei.com>,
<salil.mehta@...wei.com>, <lipeng321@...wei.com>
Subject: [PATCH net-next 6/9] net: hns3: Add timeout process in hns3_enet
This patch add timeout handler in hns3_enet.c to handle
TX side timeout event, when TX timeout event occur, it will triger
NIC driver into reset process.
Signed-off-by: qumingguang <qumingguang@...wei.com>
Signed-off-by: Lipeng <lipeng321@...wei.com>
---
.../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c | 86 ++++++++++++++++++++++
.../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h | 2 +
2 files changed, 88 insertions(+)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
index c6c5b2a..aed6611 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
@@ -258,6 +258,7 @@ static int hns3_nic_net_up(struct net_device *netdev)
static int hns3_nic_net_open(struct net_device *netdev)
{
+ struct hns3_nic_priv *priv = netdev_priv(netdev);
int ret;
netif_carrier_off(netdev);
@@ -273,6 +274,7 @@ static int hns3_nic_net_open(struct net_device *netdev)
return ret;
}
+ priv->last_reset_time = jiffies;
return 0;
}
@@ -1322,10 +1324,91 @@ static int hns3_nic_change_mtu(struct net_device *netdev, int new_mtu)
return ret;
}
+static bool hns3_get_tx_timeo_queue_info(struct net_device *ndev)
+{
+ struct hns3_nic_priv *priv = netdev_priv(ndev);
+ struct hns3_enet_ring *tx_ring = NULL;
+ int timeout_queue = 0;
+ int hw_head, hw_tail;
+ int i;
+
+ /* Find the stopped queue the same way the stack does */
+ for (i = 0; i < ndev->real_num_tx_queues; i++) {
+ struct netdev_queue *q;
+ unsigned long trans_start;
+
+ q = netdev_get_tx_queue(ndev, i);
+ trans_start = q->trans_start;
+ if (netif_xmit_stopped(q) &&
+ time_after(jiffies,
+ (trans_start + ndev->watchdog_timeo))) {
+ timeout_queue = i;
+ break;
+ }
+ }
+
+ if (i == ndev->num_tx_queues) {
+ netdev_info(ndev,
+ "no netdev TX timeout queue found, timeout count: %llu\n",
+ priv->tx_timeout_count);
+ return false;
+ }
+
+ tx_ring = priv->ring_data[timeout_queue].ring;
+
+ hw_head = readl_relaxed(tx_ring->tqp->io_base +
+ HNS3_RING_RX_RING_HEAD_REG);
+ hw_tail = readl_relaxed(tx_ring->tqp->io_base +
+ HNS3_RING_RX_RING_TAIL_REG);
+ netdev_info(ndev,
+ "tx_timeout count: %llu, queue id: %d, SW_NTU: 0x%x, SW_NTC: 0x%x, HW_HEAD: 0x%x, HW_TAIL: 0x%x, INT: 0x%x\n",
+ priv->tx_timeout_count,
+ timeout_queue,
+ tx_ring->next_to_use,
+ tx_ring->next_to_clean,
+ hw_head,
+ hw_tail,
+ readl(tx_ring->tqp_vector->mask_addr));
+
+ return true;
+}
+
+static void hns3_nic_net_timeout(struct net_device *ndev)
+{
+ struct hns3_nic_priv *priv = netdev_priv(ndev);
+ unsigned long last_reset_time = priv->last_reset_time;
+ struct hnae3_handle *h = priv->ae_handle;
+
+ if (!hns3_get_tx_timeo_queue_info(ndev))
+ return;
+
+ priv->tx_timeout_count++;
+
+ /* This timeout is far away enough from last timeout,
+ * if timeout again,set the reset type to PF reset
+ */
+ if (time_after(jiffies, (last_reset_time + 20 * HZ)))
+ priv->reset_level = HNAE3_FUNC_RESET;
+
+ /* Don't do any new action before the next timeout */
+ else if (time_before(jiffies, (last_reset_time + ndev->watchdog_timeo)))
+ return;
+
+ priv->last_reset_time = jiffies;
+
+ if (h->ae_algo->ops->reset_event)
+ h->ae_algo->ops->reset_event(h, priv->reset_level, 0);
+
+ priv->reset_level++;
+ if (priv->reset_level > HNAE3_GLOBAL_RESET)
+ priv->reset_level = HNAE3_GLOBAL_RESET;
+}
+
static const struct net_device_ops hns3_nic_netdev_ops = {
.ndo_open = hns3_nic_net_open,
.ndo_stop = hns3_nic_net_stop,
.ndo_start_xmit = hns3_nic_net_xmit,
+ .ndo_tx_timeout = hns3_nic_net_timeout,
.ndo_set_mac_address = hns3_nic_net_set_mac_address,
.ndo_change_mtu = hns3_nic_change_mtu,
.ndo_set_features = hns3_nic_set_features,
@@ -2763,6 +2846,9 @@ static int hns3_client_init(struct hnae3_handle *handle)
priv->dev = &pdev->dev;
priv->netdev = netdev;
priv->ae_handle = handle;
+ priv->last_reset_time = jiffies;
+ priv->reset_level = HNAE3_FUNC_RESET;
+ priv->tx_timeout_count = 0;
handle->kinfo.netdev = netdev;
handle->priv = (void *)priv;
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h
index 58dc30b..8a9de75 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h
@@ -518,6 +518,8 @@ struct hns3_nic_priv {
/* The most recently read link state */
int link;
u64 tx_timeout_count;
+ enum hnae3_reset_type reset_level;
+ unsigned long last_reset_time;
unsigned long state;
--
1.9.1
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