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Message-ID: <20250724092505.8-9-extja@kvaser.com>
Date: Thu, 24 Jul 2025 11:25:02 +0200
From: Jimmy Assarsson <extja@...ser.com>
To: linux-can@...r.kernel.org
Cc: Jimmy Assarsson <jimmyassarsson@...il.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
Vincent Mailhol <mailhol.vincent@...adoo.fr>,
netdev@...r.kernel.org
Subject: [PATCH v2 08/11] can: kvaser_usb: Add devlink support
Add devlink support at device level.
Example output:
$ devlink dev
usb/1-1.3:1.0
$ devlink dev info
usb/1-1.3:1.0:
driver kvaser_usb
Signed-off-by: Jimmy Assarsson <extja@...ser.com>
---
Changes in v2:
- Add two space indentation to terminal output.
Suggested by Vincent Mailhol [1]
[1] https://lore.kernel.org/linux-can/20250723083236.9-1-extja@kvaser.com/T/#m31ee4aad13ee29d5559b56fdce842609ae4f67c5
drivers/net/can/usb/Kconfig | 1 +
drivers/net/can/usb/kvaser_usb/Makefile | 2 +-
drivers/net/can/usb/kvaser_usb/kvaser_usb.h | 3 +
.../net/can/usb/kvaser_usb/kvaser_usb_core.c | 72 ++++++++++++-------
.../can/usb/kvaser_usb/kvaser_usb_devlink.c | 10 +++
5 files changed, 62 insertions(+), 26 deletions(-)
create mode 100644 drivers/net/can/usb/kvaser_usb/kvaser_usb_devlink.c
diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig
index 9dae0c71a2e1..a7547a83120e 100644
--- a/drivers/net/can/usb/Kconfig
+++ b/drivers/net/can/usb/Kconfig
@@ -66,6 +66,7 @@ config CAN_GS_USB
config CAN_KVASER_USB
tristate "Kvaser CAN/USB interface"
+ select NET_DEVLINK
help
This driver adds support for Kvaser CAN/USB devices like Kvaser
Leaf Light, Kvaser USBcan II and Kvaser Memorator Pro 5xHS.
diff --git a/drivers/net/can/usb/kvaser_usb/Makefile b/drivers/net/can/usb/kvaser_usb/Makefile
index cf260044f0b9..41b4a11555aa 100644
--- a/drivers/net/can/usb/kvaser_usb/Makefile
+++ b/drivers/net/can/usb/kvaser_usb/Makefile
@@ -1,3 +1,3 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb.o
-kvaser_usb-y = kvaser_usb_core.o kvaser_usb_leaf.o kvaser_usb_hydra.o
+kvaser_usb-y = kvaser_usb_core.o kvaser_usb_devlink.o kvaser_usb_leaf.o kvaser_usb_hydra.o
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb.h b/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
index 35c2cf3d4486..d5f913ac9b44 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb.h
@@ -27,6 +27,7 @@
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/usb.h>
+#include <net/devlink.h>
#include <linux/can.h>
#include <linux/can/dev.h>
@@ -226,6 +227,8 @@ struct kvaser_usb_dev_cfg {
extern const struct kvaser_usb_dev_ops kvaser_usb_hydra_dev_ops;
extern const struct kvaser_usb_dev_ops kvaser_usb_leaf_dev_ops;
+extern const struct devlink_ops kvaser_usb_devlink_ops;
+
void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv);
int kvaser_usb_recv_cmd(const struct kvaser_usb *dev, void *cmd, int len,
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 2313fbc1a2c3..b9b2e120a5cd 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -914,6 +914,7 @@ static int kvaser_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct kvaser_usb *dev;
+ struct devlink *devlink;
int err;
int i;
const struct kvaser_usb_driver_info *driver_info;
@@ -923,17 +924,20 @@ static int kvaser_usb_probe(struct usb_interface *intf,
if (!driver_info)
return -ENODEV;
- dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
- if (!dev)
+ devlink = devlink_alloc(&kvaser_usb_devlink_ops, sizeof(*dev), &intf->dev);
+ if (!devlink)
return -ENOMEM;
+ dev = devlink_priv(devlink);
dev->intf = intf;
dev->driver_info = driver_info;
ops = driver_info->ops;
err = ops->dev_setup_endpoints(dev);
- if (err)
- return dev_err_probe(&intf->dev, err, "Cannot get usb endpoint(s)");
+ if (err) {
+ dev_err_probe(&intf->dev, err, "Cannot get usb endpoint(s)");
+ goto free_devlink;
+ }
dev->udev = interface_to_usbdev(intf);
@@ -944,50 +948,66 @@ static int kvaser_usb_probe(struct usb_interface *intf,
dev->card_data.ctrlmode_supported = 0;
dev->card_data.capabilities = 0;
err = ops->dev_init_card(dev);
- if (err)
- return dev_err_probe(&intf->dev, err,
- "Failed to initialize card\n");
+ if (err) {
+ dev_err_probe(&intf->dev, err,
+ "Failed to initialize card\n");
+ goto free_devlink;
+ }
err = ops->dev_get_software_info(dev);
- if (err)
- return dev_err_probe(&intf->dev, err,
- "Cannot get software info\n");
+ if (err) {
+ dev_err_probe(&intf->dev, err,
+ "Cannot get software info\n");
+ goto free_devlink;
+ }
if (ops->dev_get_software_details) {
err = ops->dev_get_software_details(dev);
- if (err)
- return dev_err_probe(&intf->dev, err,
- "Cannot get software details\n");
+ if (err) {
+ dev_err_probe(&intf->dev, err,
+ "Cannot get software details\n");
+ goto free_devlink;
+ }
}
- if (WARN_ON(!dev->cfg))
- return -ENODEV;
+ if (WARN_ON(!dev->cfg)) {
+ err = -ENODEV;
+ goto free_devlink;
+ }
dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
err = ops->dev_get_card_info(dev);
- if (err)
- return dev_err_probe(&intf->dev, err,
- "Cannot get card info\n");
+ if (err) {
+ dev_err_probe(&intf->dev, err,
+ "Cannot get card info\n");
+ goto free_devlink;
+ }
if (ops->dev_get_capabilities) {
err = ops->dev_get_capabilities(dev);
if (err) {
- kvaser_usb_remove_interfaces(dev);
- return dev_err_probe(&intf->dev, err,
- "Cannot get capabilities\n");
+ dev_err_probe(&intf->dev, err,
+ "Cannot get capabilities\n");
+ goto remove_interfaces;
}
}
for (i = 0; i < dev->nchannels; i++) {
err = kvaser_usb_init_one(dev, i);
- if (err) {
- kvaser_usb_remove_interfaces(dev);
- return err;
- }
+ if (err)
+ goto remove_interfaces;
}
+ devlink_register(devlink);
return 0;
+
+remove_interfaces:
+ kvaser_usb_remove_interfaces(dev);
+free_devlink:
+ devlink_free(devlink);
+
+ return err;
}
static void kvaser_usb_disconnect(struct usb_interface *intf)
@@ -1000,6 +1020,8 @@ static void kvaser_usb_disconnect(struct usb_interface *intf)
return;
kvaser_usb_remove_interfaces(dev);
+ devlink_unregister(priv_to_devlink(dev));
+ devlink_free(priv_to_devlink(dev));
}
static struct usb_driver kvaser_usb_driver = {
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_devlink.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_devlink.c
new file mode 100644
index 000000000000..9a3a8966a0a1
--- /dev/null
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_devlink.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/* kvaser_usb devlink functions
+ *
+ * Copyright (C) 2025 KVASER AB, Sweden. All rights reserved.
+ */
+
+#include <net/devlink.h>
+
+const struct devlink_ops kvaser_usb_devlink_ops = {
+};
--
2.49.0
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