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Date: Mon, 6 Jun 2022 17:32:06 +0200
From: Jimmy Assarsson <extja@...ser.com>
To: Anssi Hannula <anssi.hannula@...wise.fi>
Cc: linux-can@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/12] can: kvaser_usb_leaf: Fix improved state not being
reported
On 5/16/22 15:47, Anssi Hannula wrote:
> 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 the driver seems to be prepared for non-error-counter devices
> (!KVASER_USB_HAS_TXRX_ERRORS) as well, also always poll in ERROR_PASSIVE
> even if the counters show zero.
>
> Fixes: 080f40a6fa28 ("can: kvaser_usb: Add support for Kvaser CAN/USB devices")
> Signed-off-by: Anssi Hannula <anssi.hannula@...wise.fi>
Looks good to me.
Tested-by: Jimmy Assarsson <extja@...ser.com>
> ---
> drivers/net/can/usb/kvaser_usb/kvaser_usb.h | 7 +++
> .../net/can/usb/kvaser_usb/kvaser_usb_core.c | 18 +++++-
> .../net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 58 +++++++++++++++++++
> 3 files changed, 80 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 f1bea13a3829..70aa7a9ed35b 100644
> --- a/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
> +++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
> @@ -107,6 +107,9 @@ 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;
> @@ -128,6 +131,8 @@ 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
> @@ -149,6 +154,8 @@ 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 a8d72fb8291a..6a1ebdd9ba85 100644
> --- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
> +++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
> @@ -645,6 +645,9 @@ static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
> if (!dev->nets[i])
> continue;
>
> + if (dev->ops->dev_remove_channel)
> + dev->ops->dev_remove_channel(dev->nets[i]);
> +
> free_candev(dev->nets[i]->netdev);
> }
> }
> @@ -712,17 +715,26 @@ static int kvaser_usb_init_one(struct kvaser_usb *dev,
>
> dev->nets[channel] = priv;
>
> + if (dev->ops->dev_init_channel) {
> + err = dev->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 5f27c00179c1..abb681808a28 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
> @@ -375,6 +377,12 @@ 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_bittiming_const = {
> .name = "kvaser_usb",
> .tseg1_min = KVASER_USB_TSEG1_MIN,
> @@ -757,6 +765,16 @@ 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,
> @@ -828,6 +846,7 @@ 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) {
> @@ -837,6 +856,7 @@ 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
> @@ -853,6 +873,14 @@ 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++;
> @@ -1312,10 +1340,13 @@ 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)
> @@ -1362,6 +1393,31 @@ 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);
> @@ -1463,6 +1519,8 @@ 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,
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