[PATCH 6.1 0249/1146] can: kvaser_usb_leaf: Fix improved state not being reported

Greg Kroah-Hartman
2022-12-28T15:31:01Z

From: Anssi Hannula <anssi.hannula@bitwise.fi>

[ Upstream commit 8d21f5927ae604881f98587fabf6753f88730968 ]

The tested 0bfd:0017 Kvaser Memorator Professional HS/HS FW 2.0.50 and
0bfd:0124 Kvaser Mini PCI Express 2xHS FW 4.18.778 do not seem to send
any unsolicited events when error counters decrease or when the device
transitions from ERROR_PASSIVE to ERROR_ACTIVE (or WARNING).

This causes the interface to e.g. indefinitely stay in the ERROR_PASSIVE
state.

Fix that by asking for chip state (inc. counters) event every 0.5 secs
when error counters are non-zero.

Since there are non-error-counter devices, also always poll in
ERROR_PASSIVE even if the counters show zero.

Fixes: 080f40a6fa28 ("can: kvaser_usb: Add support for Kvaser CAN/USB devices")
Tested-by: Jimmy Assarsson <extja@kvaser.com>
Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Link: https://lore.kernel.org/all/20221010185237.319219-7-extja@kvaser.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/can/usb/kvaser_usb/kvaser_usb.h | 7 +++
.../net/can/usb/kvaser_usb/kvaser_usb_core.c | 19 +++++-
.../net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 58 +++++++++++++++++++
3 files changed, 81 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb.h b/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
index f6c0938027ec..d9c5dd5da908 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
@@ -104,6 +104,9 @@ struct kvaser_usb_net_priv {
struct can_priv can;
struct can_berr_counter bec;

+ /* subdriver-specific data */
+ void *sub_priv;
+
struct kvaser_usb *dev;
struct net_device *netdev;
int channel;
@@ -125,6 +128,8 @@ struct kvaser_usb_net_priv {
*
* @dev_setup_endpoints: setup USB in and out endpoints
* @dev_init_card: initialize card
+ * @dev_init_channel: initialize channel
+ * @dev_remove_channel: uninitialize channel
* @dev_get_software_info: get software info
* @dev_get_software_details: get software details
* @dev_get_card_info: get card info
@@ -146,6 +151,8 @@ struct kvaser_usb_dev_ops {
struct can_berr_counter *bec);
int (*dev_setup_endpoints)(struct kvaser_usb *dev);
int (*dev_init_card)(struct kvaser_usb *dev);
+ int (*dev_init_channel)(struct kvaser_usb_net_priv *priv);
+ void (*dev_remove_channel)(struct kvaser_usb_net_priv *priv);
int (*dev_get_software_info)(struct kvaser_usb *dev);
int (*dev_get_software_details)(struct kvaser_usb *dev);
int (*dev_get_card_info)(struct kvaser_usb *dev);
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
index 802e27c0eced..0ebdfb77c50f 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -684,6 +684,7 @@ static const struct ethtool_ops kvaser_usb_ethtool_ops_hwts = {

static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
{
+ const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
int i;

for (i = 0; i < dev->nchannels; i++) {
@@ -699,6 +700,9 @@ static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
if (!dev->nets[i])
continue;

+ if (ops->dev_remove_channel)
+ ops->dev_remove_channel(dev->nets[i]);
+
free_candev(dev->nets[i]->netdev);
}
}
@@ -772,17 +776,26 @@ static int kvaser_usb_init_one(struct kvaser_usb *dev, int channel)

dev->nets[channel] = priv;

+ if (ops->dev_init_channel) {
+ err = ops->dev_init_channel(priv);
+ if (err)
+ goto err;
+ }
+
err = register_candev(netdev);
if (err) {
dev_err(&dev->intf->dev, "Failed to register CAN device\n");
- free_candev(netdev);
- dev->nets[channel] = NULL;
- return err;
+ goto err;
}

netdev_dbg(netdev, "device registered\n");

return 0;
+
+err:
+ free_candev(netdev);
+ dev->nets[channel] = NULL;
+ return err;
}

static int kvaser_usb_probe(struct usb_interface *intf,
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index a6a26085bc15..993fcc19637d 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -21,6 +21,7 @@
#include <linux/types.h>
#include <linux/units.h>
#include <linux/usb.h>
+#include <linux/workqueue.h>

#include <linux/can.h>
#include <linux/can/dev.h>
@@ -56,6 +57,7 @@
#define CMD_RX_EXT_MESSAGE 14
#define CMD_TX_EXT_MESSAGE 15
#define CMD_SET_BUS_PARAMS 16
+#define CMD_GET_CHIP_STATE 19
#define CMD_CHIP_STATE_EVENT 20
#define CMD_SET_CTRL_MODE 21
#define CMD_RESET_CHIP 24
@@ -421,6 +423,12 @@ struct kvaser_usb_err_summary {
};
};

+struct kvaser_usb_net_leaf_priv {
+ struct kvaser_usb_net_priv *net;
+
+ struct delayed_work chip_state_req_work;
+};
+
static const struct can_bittiming_const kvaser_usb_leaf_m16c_bittiming_const = {
.name = "kvaser_usb_ucii",
.tseg1_min = 4,
@@ -943,6 +951,16 @@ static int kvaser_usb_leaf_simple_cmd_async(struct kvaser_usb_net_priv *priv,
return err;
}

+static void kvaser_usb_leaf_chip_state_req_work(struct work_struct *work)
+{
+ struct kvaser_usb_net_leaf_priv *leaf =
+ container_of(work, struct kvaser_usb_net_leaf_priv,
+ chip_state_req_work.work);
+ struct kvaser_usb_net_priv *priv = leaf->net;
+
+ kvaser_usb_leaf_simple_cmd_async(priv, CMD_GET_CHIP_STATE);
+}
+
static void
kvaser_usb_leaf_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
const struct kvaser_usb_err_summary *es,
@@ -1014,6 +1032,7 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
struct sk_buff *skb;
struct net_device_stats *stats;
struct kvaser_usb_net_priv *priv;
+ struct kvaser_usb_net_leaf_priv *leaf;
enum can_state old_state, new_state;

if (es->channel >= dev->nchannels) {
@@ -1023,6 +1042,7 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
}

priv = dev->nets[es->channel];
+ leaf = priv->sub_priv;
stats = &priv->netdev->stats;

/* Update all of the CAN interface's state and error counters before
@@ -1039,6 +1059,14 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
kvaser_usb_leaf_rx_error_update_can_state(priv, es, &tmp_cf);
new_state = priv->can.state;

+ /* If there are errors, request status updates periodically as we do
+ * not get automatic notifications of improved state.
+ */
+ if (new_state < CAN_STATE_BUS_OFF &&
+ (es->rxerr || es->txerr || new_state == CAN_STATE_ERROR_PASSIVE))
+ schedule_delayed_work(&leaf->chip_state_req_work,
+ msecs_to_jiffies(500));
+
skb = alloc_can_err_skb(priv->netdev, &cf);
if (!skb) {
stats->rx_dropped++;
@@ -1573,10 +1601,13 @@ static int kvaser_usb_leaf_start_chip(struct kvaser_usb_net_priv *priv)

static int kvaser_usb_leaf_stop_chip(struct kvaser_usb_net_priv *priv)
{
+ struct kvaser_usb_net_leaf_priv *leaf = priv->sub_priv;
int err;

reinit_completion(&priv->stop_comp);

+ cancel_delayed_work(&leaf->chip_state_req_work);
+
err = kvaser_usb_leaf_send_simple_cmd(priv->dev, CMD_STOP_CHIP,
priv->channel);
if (err)
@@ -1623,6 +1654,31 @@ static int kvaser_usb_leaf_init_card(struct kvaser_usb *dev)
return 0;
}

+static int kvaser_usb_leaf_init_channel(struct kvaser_usb_net_priv *priv)
+{
+ struct kvaser_usb_net_leaf_priv *leaf;
+
+ leaf = devm_kzalloc(&priv->dev->intf->dev, sizeof(*leaf), GFP_KERNEL);
+ if (!leaf)
+ return -ENOMEM;
+
+ leaf->net = priv;
+ INIT_DELAYED_WORK(&leaf->chip_state_req_work,
+ kvaser_usb_leaf_chip_state_req_work);
+
+ priv->sub_priv = leaf;
+
+ return 0;
+}
+
+static void kvaser_usb_leaf_remove_channel(struct kvaser_usb_net_priv *priv)
+{
+ struct kvaser_usb_net_leaf_priv *leaf = priv->sub_priv;
+
+ if (leaf)
+ cancel_delayed_work_sync(&leaf->chip_state_req_work);
+}
+
static int kvaser_usb_leaf_set_bittiming(struct net_device *netdev)
{
struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
@@ -1720,6 +1776,8 @@ const struct kvaser_usb_dev_ops kvaser_usb_leaf_dev_ops = {
.dev_get_berr_counter = kvaser_usb_leaf_get_berr_counter,
.dev_setup_endpoints = kvaser_usb_leaf_setup_endpoints,
.dev_init_card = kvaser_usb_leaf_init_card,
+ .dev_init_channel = kvaser_usb_leaf_init_channel,
+ .dev_remove_channel = kvaser_usb_leaf_remove_channel,
.dev_get_software_info = kvaser_usb_leaf_get_software_info,
.dev_get_software_details = NULL,
.dev_get_card_info = kvaser_usb_leaf_get_card_info,
--
2.35.1