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

From: Ido Schimmel
Date: Wed Jun 03 2020 - 06:07:57 EST

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On Thu, May 28, 2020 at 06:12:42PM +0300, Vadym Kochan wrote:
> Add very basic support for devlink interface:
>
> - driver name
> - fw version
> - devlink ports

I suggest adding support for reload while the driver is still simple. I
use it all the time because I run with modules built-in. It's also used
in FIB offload tests to relocate the netdevs to a different namespace
where the test is performed

>
> Signed-off-by: Vadym Kochan <vadym.kochan@xxxxxxxxxxx>
> ---
> 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 | 111 ++++++++++++++++++
> .../marvell/prestera/prestera_devlink.h | 25 ++++
> .../ethernet/marvell/prestera/prestera_main.c | 27 ++++-
> 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 0848edb272a5..dfd5174d0568 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 5079d872e18a..f8abaaff5f21 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera.h
> +++ b/drivers/net/ethernet/marvell/prestera/prestera.h
> @@ -11,6 +11,9 @@
> #include <linux/notifier.h>
> #include <uapi/linux/if_ether.h>
> #include <linux/workqueue.h>
> +#include <net/devlink.h>
> +
> +#define PRESTERA_DRV_NAME "prestera"
>
> struct prestera_fw_rev {
> u16 maj;
> @@ -63,6 +66,7 @@ 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..58021057981b
> --- /dev/null
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_devlink.c
> @@ -0,0 +1,111 @@
> +// 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.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 = 0;
> +
> + 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);
> +
> + err = devlink_info_version_running_put(req,
> + DEVLINK_INFO_VERSION_GENERIC_FW,
> + buf);
> + if (err)
> + return err;
> +
> + return 0;
> +}
> +
> +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_warn(sw->dev->dev, "devlink_register failed: %d\n", err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +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 devlink *dl = priv_to_devlink(port->sw);
> + struct prestera_switch *sw;
> + int err;
> +
> + sw = port->sw;
> + dl = priv_to_devlink(sw);
> +
> + devlink_port_attrs_set(&port->dl_port, DEVLINK_PORT_FLAVOUR_PHYSICAL,
> + port->fp_id, false, 0,
> + &port->sw->id, sizeof(port->sw->id));
> +
> + err = devlink_port_register(dl, &port->dl_port, port->fp_id);
> + if (err)
> + dev_err(sw->dev->dev, "devlink_port_register failed: %d\n", err);

Return the error?

> +
> + return 0;
> +}
> +
> +void prestera_devlink_port_unregister(struct prestera_port *port)
> +{
> + devlink_port_unregister(&port->dl_port);
> +}
> +
> +void prestera_devlink_port_type_set(struct prestera_port *port)
> +{
> + devlink_port_type_eth_set(&port->dl_port, port->dev);
> +}
> +
> +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..b46441d1e758
> --- /dev/null
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_devlink.h
> @@ -0,0 +1,25 @@
> +/* 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_type_set(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 b5241e9b784a..ddab9422fe5e 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
> @@ -14,6 +14,7 @@
> #include "prestera.h"
> #include "prestera_hw.h"
> #include "prestera_rxtx.h"
> +#include "prestera_devlink.h"
>
> #define PRESTERA_MTU_DEFAULT 1536
>
> @@ -185,6 +186,7 @@ static const struct net_device_ops 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,
> @@ -234,9 +236,13 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
> &port->hw_id, &port->dev_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;

Seems like an unrelated change

> }
>
> + err = prestera_devlink_port_register(port);
> + if (err)
> + goto err_dl_port_register;
> +
> dev->features |= NETIF_F_NETNS_LOCAL;
> dev->netdev_ops = &netdev_ops;
>
> @@ -295,11 +301,16 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
> if (err)
> goto err_register_netdev;
>
> + prestera_devlink_port_type_set(port);
> +
> return 0;
>
> err_register_netdev:
> list_del_rcu(&port->list);
> err_port_init:
> + prestera_devlink_port_unregister(port);
> +err_dl_port_register:
> +err_port_info_get:
> free_netdev(dev);
> return err;
> }
> @@ -313,6 +324,7 @@ static void prestera_port_destroy(struct prestera_port *port)

Shouldn't you call devlink_port_type_clear() here?

>
> list_del_rcu(&port->list);
>
> + prestera_devlink_port_unregister(port);
> free_netdev(dev);
> }
>
> @@ -435,6 +447,10 @@ static int prestera_switch_init(struct prestera_switch *sw)
> if (err)
> return err;
>
> + err = prestera_devlink_register(sw);
> + if (err)
> + goto err_dl_register;
> +
> err = prestera_create_ports(sw);
> if (err)
> goto err_ports_create;
> @@ -442,6 +458,8 @@ 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);
>
> return err;
> @@ -450,6 +468,7 @@ 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);
> }
> @@ -459,7 +478,7 @@ 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;
>
> @@ -468,7 +487,7 @@ int prestera_device_register(struct prestera_device *dev)
>
> err = prestera_switch_init(sw);
> if (err) {
> - kfree(sw);
> + prestera_devlink_free(sw);
> return err;
> }
>
> @@ -481,7 +500,7 @@ 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
>

Next message: Joerg Roedel: "Re: [PATCH v3 23/75] x86/boot/compressed/64: Setup GHCB Based VC Exception handler"
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