[net-next v8 3/6] net: marvell: prestera: Add basic devlink support

Vadym Kochan
2020-09-10T19:53:42Z

Add very basic support for devlink interface:

- driver name
- fw version
- devlink ports

Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
---
PATCH v8:
1) Put license in one line.

2) Use traditional error handling pattern in prestera_devlink_port_register():

err = F();
if (err)
return err;

3) Initialize 'sw' and 'dl' on definition.

PATCH v5:
1) Simplified some error path handling by simple return error code in:

- prestera_dl_info_get(...)

2) Remove not-needed err assignment in:
- prestera_dl_info_get(...)

3) Use dev_err() in prestera_devlink_register(...).

drivers/net/ethernet/marvell/prestera/Kconfig | 1 +
.../net/ethernet/marvell/prestera/Makefile | 2 +-
.../net/ethernet/marvell/prestera/prestera.h | 4 +
.../marvell/prestera/prestera_devlink.c | 112 ++++++++++++++++++
.../marvell/prestera/prestera_devlink.h | 23 ++++
.../ethernet/marvell/prestera/prestera_main.c | 28 ++++-
6 files changed, 165 insertions(+), 5 deletions(-)
create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_devlink.c
create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_devlink.h

diff --git a/drivers/net/ethernet/marvell/prestera/Kconfig b/drivers/net/ethernet/marvell/prestera/Kconfig
index 2a5945c455cc..b1fcc44f566a 100644
--- a/drivers/net/ethernet/marvell/prestera/Kconfig
+++ b/drivers/net/ethernet/marvell/prestera/Kconfig
@@ -6,6 +6,7 @@
config PRESTERA
tristate "Marvell Prestera Switch ASICs support"
depends on NET_SWITCHDEV && VLAN_8021Q
+ select NET_DEVLINK
help
This driver supports Marvell Prestera Switch ASICs family.

diff --git a/drivers/net/ethernet/marvell/prestera/Makefile b/drivers/net/ethernet/marvell/prestera/Makefile
index 2146714eab21..babd71fba809 100644
--- a/drivers/net/ethernet/marvell/prestera/Makefile
+++ b/drivers/net/ethernet/marvell/prestera/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_PRESTERA) += prestera.o
prestera-objs := prestera_main.o prestera_hw.o prestera_dsa.o \
- prestera_rxtx.o
+ prestera_rxtx.o prestera_devlink.o

obj-$(CONFIG_PRESTERA_PCI) += prestera_pci.o
diff --git a/drivers/net/ethernet/marvell/prestera/prestera.h b/drivers/net/ethernet/marvell/prestera/prestera.h
index c5bf0fe8d59e..0a34d7ca4823 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera.h
+++ b/drivers/net/ethernet/marvell/prestera/prestera.h
@@ -7,8 +7,11 @@
#include <linux/notifier.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
+#include <net/devlink.h>
#include <uapi/linux/if_ether.h>

+#define PRESTERA_DRV_NAME "prestera"
+
struct prestera_fw_rev {
u16 maj;
u16 min;
@@ -58,6 +61,7 @@ struct prestera_port_caps {
struct prestera_port {
struct net_device *dev;
struct prestera_switch *sw;
+ struct devlink_port dl_port;
u32 id;
u32 hw_id;
u32 dev_id;
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_devlink.c b/drivers/net/ethernet/marvell/prestera/prestera_devlink.c
new file mode 100644
index 000000000000..94c185a0e2b8
--- /dev/null
+++ b/drivers/net/ethernet/marvell/prestera/prestera_devlink.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/* Copyright (c) 2019-2020 Marvell International Ltd. All rights reserved */
+
+#include <net/devlink.h>
+
+#include "prestera_devlink.h"
+
+static int prestera_dl_info_get(struct devlink *dl,
+ struct devlink_info_req *req,
+ struct netlink_ext_ack *extack)
+{
+ struct prestera_switch *sw = devlink_priv(dl);
+ char buf[16];
+ int err;
+
+ err = devlink_info_driver_name_put(req, PRESTERA_DRV_NAME);
+ if (err)
+ return err;
+
+ snprintf(buf, sizeof(buf), "%d.%d.%d",
+ sw->dev->fw_rev.maj,
+ sw->dev->fw_rev.min,
+ sw->dev->fw_rev.sub);
+
+ return devlink_info_version_running_put(req,
+ DEVLINK_INFO_VERSION_GENERIC_FW,
+ buf);
+}
+
+static const struct devlink_ops prestera_dl_ops = {
+ .info_get = prestera_dl_info_get,
+};
+
+struct prestera_switch *prestera_devlink_alloc(void)
+{
+ struct devlink *dl;
+
+ dl = devlink_alloc(&prestera_dl_ops, sizeof(struct prestera_switch));
+
+ return devlink_priv(dl);
+}
+
+void prestera_devlink_free(struct prestera_switch *sw)
+{
+ struct devlink *dl = priv_to_devlink(sw);
+
+ devlink_free(dl);
+}
+
+int prestera_devlink_register(struct prestera_switch *sw)
+{
+ struct devlink *dl = priv_to_devlink(sw);
+ int err;
+
+ err = devlink_register(dl, sw->dev->dev);
+ if (err)
+ dev_err(prestera_dev(sw), "devlink_register failed: %d\n", err);
+
+ return err;
+}
+
+void prestera_devlink_unregister(struct prestera_switch *sw)
+{
+ struct devlink *dl = priv_to_devlink(sw);
+
+ devlink_unregister(dl);
+}
+
+int prestera_devlink_port_register(struct prestera_port *port)
+{
+ struct prestera_switch *sw = port->sw;
+ struct devlink *dl = priv_to_devlink(sw);
+ struct devlink_port_attrs attrs = {};
+ int err;
+
+ attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
+ attrs.phys.port_number = port->fp_id;
+ attrs.switch_id.id_len = sizeof(sw->id);
+ memcpy(attrs.switch_id.id, &sw->id, attrs.switch_id.id_len);
+
+ devlink_port_attrs_set(&port->dl_port, &attrs);
+
+ err = devlink_port_register(dl, &port->dl_port, port->fp_id);
+ if (err) {
+ dev_err(prestera_dev(sw), "devlink_port_register failed: %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+void prestera_devlink_port_unregister(struct prestera_port *port)
+{
+ devlink_port_unregister(&port->dl_port);
+}
+
+void prestera_devlink_port_set(struct prestera_port *port)
+{
+ devlink_port_type_eth_set(&port->dl_port, port->dev);
+}
+
+void prestera_devlink_port_clear(struct prestera_port *port)
+{
+ devlink_port_type_clear(&port->dl_port);
+}
+
+struct devlink_port *prestera_devlink_get_port(struct net_device *dev)
+{
+ struct prestera_port *port = netdev_priv(dev);
+
+ return &port->dl_port;
+}
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_devlink.h b/drivers/net/ethernet/marvell/prestera/prestera_devlink.h
new file mode 100644
index 000000000000..51bee9f75415
--- /dev/null
+++ b/drivers/net/ethernet/marvell/prestera/prestera_devlink.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/* Copyright (c) 2019-2020 Marvell International Ltd. All rights reserved. */
+
+#ifndef _PRESTERA_DEVLINK_H_
+#define _PRESTERA_DEVLINK_H_
+
+#include "prestera.h"
+
+struct prestera_switch *prestera_devlink_alloc(void);
+void prestera_devlink_free(struct prestera_switch *sw);
+
+int prestera_devlink_register(struct prestera_switch *sw);
+void prestera_devlink_unregister(struct prestera_switch *sw);
+
+int prestera_devlink_port_register(struct prestera_port *port);
+void prestera_devlink_port_unregister(struct prestera_port *port);
+
+void prestera_devlink_port_set(struct prestera_port *port);
+void prestera_devlink_port_clear(struct prestera_port *port);
+
+struct devlink_port *prestera_devlink_get_port(struct net_device *dev);
+
+#endif /* _PRESTERA_DEVLINK_H_ */
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
index eb695e2ebda3..47cd2bc367bf 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
@@ -12,6 +12,7 @@
#include "prestera.h"
#include "prestera_hw.h"
#include "prestera_rxtx.h"
+#include "prestera_devlink.h"

#define PRESTERA_MTU_DEFAULT 1536

@@ -186,6 +187,7 @@ static const struct net_device_ops prestera_netdev_ops = {
.ndo_change_mtu = prestera_port_change_mtu,
.ndo_get_stats64 = prestera_port_get_stats64,
.ndo_set_mac_address = prestera_port_set_mac_address,
+ .ndo_get_devlink_port = prestera_devlink_get_port,
};

static int prestera_port_autoneg_set(struct prestera_port *port, bool enable,
@@ -250,9 +252,13 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
&port->fp_id);
if (err) {
dev_err(prestera_dev(sw), "Failed to get port(%u) info\n", id);
- goto err_port_init;
+ goto err_port_info_get;
}

+ err = prestera_devlink_port_register(port);
+ if (err)
+ goto err_dl_port_register;
+
dev->features |= NETIF_F_NETNS_LOCAL;
dev->netdev_ops = &prestera_netdev_ops;

@@ -313,11 +319,16 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
if (err)
goto err_register_netdev;

+ prestera_devlink_port_set(port);
+
return 0;

err_register_netdev:
prestera_port_list_del(port);
err_port_init:
+ prestera_devlink_port_unregister(port);
+err_dl_port_register:
+err_port_info_get:
free_netdev(dev);
return err;
}
@@ -327,8 +338,10 @@ static void prestera_port_destroy(struct prestera_port *port)
struct net_device *dev = port->dev;

cancel_delayed_work_sync(&port->cached_hw_stats.caching_dw);
+ prestera_devlink_port_clear(port);
unregister_netdev(dev);
prestera_port_list_del(port);
+ prestera_devlink_port_unregister(port);
free_netdev(dev);
}

@@ -446,6 +459,10 @@ static int prestera_switch_init(struct prestera_switch *sw)
if (err)
goto err_handlers_register;

+ err = prestera_devlink_register(sw);
+ if (err)
+ goto err_dl_register;
+
err = prestera_create_ports(sw);
if (err)
goto err_ports_create;
@@ -453,6 +470,8 @@ static int prestera_switch_init(struct prestera_switch *sw)
return 0;

err_ports_create:
+ prestera_devlink_unregister(sw);
+err_dl_register:
prestera_event_handlers_unregister(sw);
err_handlers_register:
prestera_rxtx_switch_fini(sw);
@@ -464,6 +483,7 @@ static int prestera_switch_init(struct prestera_switch *sw)
static void prestera_switch_fini(struct prestera_switch *sw)
{
prestera_destroy_ports(sw);
+ prestera_devlink_unregister(sw);
prestera_event_handlers_unregister(sw);
prestera_rxtx_switch_fini(sw);
prestera_hw_switch_fini(sw);
@@ -474,7 +494,7 @@ int prestera_device_register(struct prestera_device *dev)
struct prestera_switch *sw;
int err;

- sw = kzalloc(sizeof(*sw), GFP_KERNEL);
+ sw = prestera_devlink_alloc();
if (!sw)
return -ENOMEM;

@@ -483,7 +503,7 @@ int prestera_device_register(struct prestera_device *dev)

err = prestera_switch_init(sw);
if (err) {
- kfree(sw);
+ prestera_devlink_free(sw);
return err;
}

@@ -496,7 +516,7 @@ void prestera_device_unregister(struct prestera_device *dev)
struct prestera_switch *sw = dev->priv;

prestera_switch_fini(sw);
- kfree(sw);
+ prestera_devlink_free(sw);
}
EXPORT_SYMBOL(prestera_device_unregister);

--
2.17.1