Message-ID: <20200511103222.GF2245@nanopsycho>
Date:   Mon, 11 May 2020 12:32:22 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Andrew Lunn <andrew@...n.ch>,
        Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Subject: Re: [RFC next-next v2 1/5] net: marvell: prestera: Add driver for
 Prestera family ASIC devices

Fri, May 01, 2020 at 01:20:48AM CEST, vadym.kochan@...ision.eu wrote:
>Marvell Prestera 98DX326x integrates up to 24 ports of 1GbE with 8
>ports of 10GbE uplinks or 2 ports of 40Gbps stacking for a largely
>wireless SMB deployment.
>
>The current implementation supports only boards designed for the Marvell
>Switchdev solution and requires special firmware.
>
>The core Prestera switching logic is implemented in prestera.c, there is
>an intermediate hw layer between core logic and firmware. It is
>implemented in prestera_hw.c, the purpose of it is to encapsulate hw
>related logic, in future there is a plan to support more devices with
>different HW related configurations.
>
>This patch contains only basic switch initialization and RX/TX support
>over SDMA mechanism.
>
>Currently supported devices have DMA access range <= 32bit and require
>ZONE_DMA to be enabled, for such cases SDMA driver checks if the skb
>allocated in proper range supported by the Prestera device.
>
>Also meanwhile there is no TX interrupt support in current firmware
>version so recycling work is sheduled on each xmit.
>
>It is required to specify 'base_mac' module parameter which is used for

No module parameter please.


>generation of initial port's mac address, as currently there is no
>some generic way to set it because base mac can be stored on different
>storage places.
>
>Signed-off-by: Andrii Savka <andrii.savka@...ision.eu>
>Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
>Signed-off-by: Serhiy Boiko <serhiy.boiko@...ision.eu>
>Signed-off-by: Serhiy Pshyk <serhiy.pshyk@...ision.eu>
>Signed-off-by: Taras Chornyi <taras.chornyi@...ision.eu>
>Signed-off-by: Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>
>Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
>---
> drivers/net/ethernet/marvell/Kconfig          |   1 +
> drivers/net/ethernet/marvell/Makefile         |   1 +
> drivers/net/ethernet/marvell/prestera/Kconfig |  13 +
> .../net/ethernet/marvell/prestera/Makefile    |   4 +
> .../net/ethernet/marvell/prestera/prestera.c  | 530 +++++++++++
> .../net/ethernet/marvell/prestera/prestera.h  | 172 ++++
> .../ethernet/marvell/prestera/prestera_dsa.c  | 134 +++
> .../ethernet/marvell/prestera/prestera_dsa.h  |  37 +
> .../ethernet/marvell/prestera/prestera_hw.c   | 614 +++++++++++++
> .../ethernet/marvell/prestera/prestera_hw.h   |  71 ++
> .../ethernet/marvell/prestera/prestera_rxtx.c | 825 ++++++++++++++++++
> .../ethernet/marvell/prestera/prestera_rxtx.h |  21 +
> 12 files changed, 2423 insertions(+)
> create mode 100644 drivers/net/ethernet/marvell/prestera/Kconfig
> create mode 100644 drivers/net/ethernet/marvell/prestera/Makefile
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera.c
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera.h
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_dsa.c
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_dsa.h
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_hw.c
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_hw.h
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_rxtx.c
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_rxtx.h
>
>diff --git a/drivers/net/ethernet/marvell/Kconfig b/drivers/net/ethernet/marvell/Kconfig
>index 3d5caea096fb..74313d9e1fc0 100644
>--- a/drivers/net/ethernet/marvell/Kconfig
>+++ b/drivers/net/ethernet/marvell/Kconfig
>@@ -171,5 +171,6 @@ config SKY2_DEBUG
> 
> 
> source "drivers/net/ethernet/marvell/octeontx2/Kconfig"
>+source "drivers/net/ethernet/marvell/prestera/Kconfig"
> 
> endif # NET_VENDOR_MARVELL
>diff --git a/drivers/net/ethernet/marvell/Makefile b/drivers/net/ethernet/marvell/Makefile
>index 89dea7284d5b..9f88fe822555 100644
>--- a/drivers/net/ethernet/marvell/Makefile
>+++ b/drivers/net/ethernet/marvell/Makefile
>@@ -12,3 +12,4 @@ obj-$(CONFIG_PXA168_ETH) += pxa168_eth.o
> obj-$(CONFIG_SKGE) += skge.o
> obj-$(CONFIG_SKY2) += sky2.o
> obj-y		+= octeontx2/
>+obj-y		+= prestera/
>diff --git a/drivers/net/ethernet/marvell/prestera/Kconfig b/drivers/net/ethernet/marvell/prestera/Kconfig
>new file mode 100644
>index 000000000000..0eddbc2e5901
>--- /dev/null
>+++ b/drivers/net/ethernet/marvell/prestera/Kconfig
>@@ -0,0 +1,13 @@
>+# SPDX-License-Identifier: GPL-2.0-only
>+#
>+# Marvell Prestera drivers configuration
>+#
>+
>+config PRESTERA
>+	tristate "Marvell Prestera Switch ASICs support"
>+	depends on NET_SWITCHDEV && VLAN_8021Q
>+	help
>+	  This driver supports Marvell Prestera Switch ASICs family.
>+
>+	  To compile this driver as a module, choose M here: the
>+	  module will be called prestera_sw.
>diff --git a/drivers/net/ethernet/marvell/prestera/Makefile b/drivers/net/ethernet/marvell/prestera/Makefile
>new file mode 100644
>index 000000000000..2c35c498339e
>--- /dev/null
>+++ b/drivers/net/ethernet/marvell/prestera/Makefile
>@@ -0,0 +1,4 @@
>+# SPDX-License-Identifier: GPL-2.0
>+obj-$(CONFIG_PRESTERA)	+= prestera_sw.o
>+prestera_sw-objs	:= prestera.o prestera_hw.o prestera_dsa.o \

Everything else is "prestera". Let the module name be "prestera" too.
Don't forget to rename this in Kconfig as well.


>+			   prestera_rxtx.o
>diff --git a/drivers/net/ethernet/marvell/prestera/prestera.c b/drivers/net/ethernet/marvell/prestera/prestera.c
>new file mode 100644
>index 000000000000..e2cccd9db742
>--- /dev/null
>+++ b/drivers/net/ethernet/marvell/prestera/prestera.c
>@@ -0,0 +1,530 @@
>+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
>+/* Copyright (c) 2019-2020 Marvell International Ltd. All rights reserved */
>+
>+#include <linux/kernel.h>
>+#include <linux/module.h>
>+#include <linux/list.h>
>+#include <linux/netdevice.h>
>+#include <linux/netdev_features.h>
>+#include <linux/etherdevice.h>
>+#include <linux/jiffies.h>
>+
>+#include "prestera.h"
>+#include "prestera_hw.h"
>+#include "prestera_rxtx.h"
>+
>+static char base_mac_addr[ETH_ALEN];
>+static char *base_mac;
>+
>+#define PRESTERA_MTU_DEFAULT 1536
>+
>+#define PRESTERA_STATS_DELAY_MS	(msecs_to_jiffies(1000))

Drop the ()s


>+
>+static struct prestera_switch *registered_switch;

Please remove this global variable.


>+static struct workqueue_struct *prestera_wq;
>+
>+struct prestera_port *prestera_port_find_by_hwid(u32 dev_id, u32 hw_id)
>+{
>+	struct prestera_port *port;
>+
>+	rcu_read_lock();
>+
>+	list_for_each_entry_rcu(port, &registered_switch->port_list, list) {
>+		if (port->dev_id == dev_id && port->hw_id == hw_id) {
>+			rcu_read_unlock();
>+			return port;
>+		}
>+	}
>+
>+	rcu_read_unlock();
>+
>+	return NULL;
>+}
>+
>+static struct prestera_port *prestera_find_port(struct prestera_switch *sw,
>+						u32 port_id)
>+{
>+	struct prestera_port *port;
>+
>+	rcu_read_lock();
>+
>+	list_for_each_entry_rcu(port, &sw->port_list, list) {
>+		if (port->id == port_id) {
>+			rcu_read_unlock();

In cases like this is good to have one unlock in the function.


>+			return port;
>+		}
>+	}
>+
>+	rcu_read_unlock();
>+
>+	return NULL;
>+}
>+
>+static int prestera_port_state_set(struct net_device *dev, bool is_up)
>+{
>+	struct prestera_port *port = netdev_priv(dev);
>+	int err;
>+
>+	if (!is_up)
>+		netif_stop_queue(dev);
>+
>+	err = prestera_hw_port_state_set(port, is_up);
>+
>+	if (is_up && !err)
>+		netif_start_queue(dev);
>+
>+	return err;
>+}
>+
>+static int prestera_port_get_port_parent_id(struct net_device *dev,
>+					    struct netdev_phys_item_id *ppid)
>+{
>+	const struct prestera_port *port = netdev_priv(dev);
>+
>+	ppid->id_len = sizeof(port->sw->id);
>+
>+	memcpy(&ppid->id, &port->sw->id, ppid->id_len);
>+	return 0;
>+}
>+
>+static int prestera_port_get_phys_port_name(struct net_device *dev,
>+					    char *buf, size_t len)
>+{

Hmm, in my previous patch version review I wrote:
"Don't implement this please. Just implement basic devlink and devlink
 port support, devlink is going to take care of the netdevice names."

Why did you chose to ignore my comment? :(


>+	const struct prestera_port *port = netdev_priv(dev);
>+
>+	snprintf(buf, len, "%u", port->fp_id);
>+	return 0;
>+}
>+
>+static int prestera_port_open(struct net_device *dev)
>+{
>+	return prestera_port_state_set(dev, true);
>+}
>+
>+static int prestera_port_close(struct net_device *dev)
>+{
>+	return prestera_port_state_set(dev, false);
>+}
>+
>+static netdev_tx_t prestera_port_xmit(struct sk_buff *skb,
>+				      struct net_device *dev)
>+{
>+	return prestera_rxtx_xmit(netdev_priv(dev), skb);
>+}
>+
>+static int prestera_is_valid_mac_addr(struct prestera_port *port, u8 *addr)
>+{
>+	if (!is_valid_ether_addr(addr))
>+		return -EADDRNOTAVAIL;
>+
>+	if (memcmp(port->sw->base_mac, addr, ETH_ALEN - 1))
>+		return -EINVAL;
>+
>+	return 0;
>+}
>+
>+static int prestera_port_set_mac_address(struct net_device *dev, void *p)
>+{
>+	struct prestera_port *port = netdev_priv(dev);
>+	struct sockaddr *addr = p;
>+	int err;
>+
>+	err = prestera_is_valid_mac_addr(port, addr->sa_data);
>+	if (err)
>+		return err;
>+
>+	err = prestera_hw_port_mac_set(port, addr->sa_data);
>+	if (err)
>+		return err;
>+
>+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
>+	return 0;
>+}
>+
>+static int prestera_port_change_mtu(struct net_device *dev, int mtu)
>+{
>+	struct prestera_port *port = netdev_priv(dev);
>+	int err;
>+
>+	err = prestera_hw_port_mtu_set(port, mtu);
>+	if (err)
>+		return err;
>+
>+	dev->mtu = mtu;
>+	return 0;
>+}
>+
>+static void prestera_port_get_stats64(struct net_device *dev,
>+				      struct rtnl_link_stats64 *stats)
>+{
>+	struct prestera_port *port = netdev_priv(dev);
>+	struct prestera_port_stats *port_stats = &port->cached_hw_stats.stats;
>+
>+	stats->rx_packets = port_stats->broadcast_frames_received +
>+				port_stats->multicast_frames_received +
>+				port_stats->unicast_frames_received;
>+
>+	stats->tx_packets = port_stats->broadcast_frames_sent +
>+				port_stats->multicast_frames_sent +
>+				port_stats->unicast_frames_sent;
>+
>+	stats->rx_bytes = port_stats->good_octets_received;
>+
>+	stats->tx_bytes = port_stats->good_octets_sent;
>+
>+	stats->rx_errors = port_stats->rx_error_frame_received;
>+	stats->tx_errors = port_stats->mac_trans_error;
>+
>+	stats->rx_dropped = port_stats->buffer_overrun;
>+	stats->tx_dropped = 0;
>+
>+	stats->multicast = port_stats->multicast_frames_received;
>+	stats->collisions = port_stats->excessive_collision;
>+
>+	stats->rx_crc_errors = port_stats->bad_crc;
>+}
>+
>+static void prestera_port_get_hw_stats(struct prestera_port *port)
>+{
>+	prestera_hw_port_stats_get(port, &port->cached_hw_stats.stats);
>+}
>+
>+static void prestera_port_stats_update(struct work_struct *work)
>+{
>+	struct prestera_port *port =
>+		container_of(work, struct prestera_port,
>+			     cached_hw_stats.caching_dw.work);
>+
>+	prestera_port_get_hw_stats(port);
>+
>+	queue_delayed_work(prestera_wq, &port->cached_hw_stats.caching_dw,
>+			   PRESTERA_STATS_DELAY_MS);
>+}
>+
>+static const struct net_device_ops netdev_ops = {
>+	.ndo_open = prestera_port_open,
>+	.ndo_stop = prestera_port_close,
>+	.ndo_start_xmit = prestera_port_xmit,
>+	.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_phys_port_name = prestera_port_get_phys_port_name,
>+	.ndo_get_port_parent_id = prestera_port_get_port_parent_id
>+};
>+
>+static int prestera_port_autoneg_set(struct prestera_port *port, bool enable,
>+				     u64 link_modes, u8 fec)
>+{
>+	bool refresh = false;
>+	int err = 0;
>+
>+	if (port->caps.type != PRESTERA_PORT_TYPE_TP)
>+		return enable ? -EINVAL : 0;
>+
>+	if (port->adver_link_modes != link_modes || port->adver_fec != fec) {
>+		port->adver_fec = fec ?: BIT(PRESTERA_PORT_FEC_OFF);
>+		port->adver_link_modes = link_modes;
>+		refresh = true;
>+	}
>+
>+	if (port->autoneg == enable && !(port->autoneg && refresh))
>+		return 0;
>+
>+	err = prestera_hw_port_autoneg_set(port, enable, port->adver_link_modes,
>+					   port->adver_fec);
>+	if (err)
>+		return -EINVAL;
>+
>+	port->autoneg = enable;
>+	return 0;
>+}
>+
>+static int prestera_port_create(struct prestera_switch *sw, u32 id)
>+{
>+	struct prestera_port *port;
>+	struct net_device *dev;
>+	int err;
>+
>+	dev = alloc_etherdev(sizeof(*port));
>+	if (!dev)
>+		return -ENOMEM;
>+
>+	port = netdev_priv(dev);
>+
>+	port->dev = dev;
>+	port->id = id;
>+	port->sw = sw;
>+
>+	err = prestera_hw_port_info_get(port, &port->fp_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;
>+	}
>+
>+	dev->features |= NETIF_F_NETNS_LOCAL;
>+	dev->netdev_ops = &netdev_ops;
>+
>+	netif_carrier_off(dev);
>+
>+	dev->mtu = min_t(unsigned int, sw->mtu_max, PRESTERA_MTU_DEFAULT);
>+	dev->min_mtu = sw->mtu_min;
>+	dev->max_mtu = sw->mtu_max;
>+
>+	err = prestera_hw_port_mtu_set(port, dev->mtu);
>+	if (err) {
>+		dev_err(prestera_dev(sw), "Failed to set port(%u) mtu(%d)\n",
>+			id, dev->mtu);
>+		goto err_port_init;
>+	}
>+
>+	/* Only 0xFF mac addrs are supported */
>+	if (port->fp_id >= 0xFF)
>+		goto err_port_init;
>+
>+	memcpy(dev->dev_addr, sw->base_mac, dev->addr_len - 1);
>+	dev->dev_addr[dev->addr_len - 1] = (char)port->fp_id;
>+
>+	err = prestera_hw_port_mac_set(port, dev->dev_addr);
>+	if (err) {
>+		dev_err(prestera_dev(sw), "Failed to set port(%u) mac addr\n", id);
>+		goto err_port_init;
>+	}
>+
>+	err = prestera_hw_port_cap_get(port, &port->caps);
>+	if (err) {
>+		dev_err(prestera_dev(sw), "Failed to get port(%u) caps\n", id);
>+		goto err_port_init;
>+	}
>+
>+	port->adver_fec = BIT(PRESTERA_PORT_FEC_OFF);
>+	prestera_port_autoneg_set(port, true, port->caps.supp_link_modes,
>+				  port->caps.supp_fec);
>+
>+	err = prestera_hw_port_state_set(port, false);
>+	if (err) {
>+		dev_err(prestera_dev(sw), "Failed to set port(%u) down\n", id);
>+		goto err_port_init;
>+	}
>+
>+	err = prestera_rxtx_port_init(port);
>+	if (err)
>+		goto err_port_init;
>+
>+	INIT_DELAYED_WORK(&port->cached_hw_stats.caching_dw,
>+			  &prestera_port_stats_update);
>+
>+	spin_lock(&sw->ports_lock);
>+	list_add(&port->list, &sw->port_list);

This is RCU list. Treat it accordingly.


>+	spin_unlock(&sw->ports_lock);

I don't follow, why do you need to protect the list by spinlock here?
More to that, why do you need the port_list reader-writer
protected (by rcu)? Is is possible that you add/remove port in the same
time packets are flying in?

If yes, you need to ensure the structs are in the memory (free_rcu,
synchronize_rcu). But I believe that you should disable that from
happening in HW.


>+
>+	err = register_netdev(dev);
>+	if (err)
>+		goto err_register_netdev;
>+
>+	return 0;
>+
>+err_register_netdev:
>+	spin_lock(&sw->ports_lock);
>+	list_del_rcu(&port->list);
>+	spin_unlock(&sw->ports_lock);
>+err_port_init:
>+	free_netdev(dev);
>+	return err;
>+}
>+
>+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);
>+	unregister_netdev(dev);
>+
>+	spin_lock(&port->sw->ports_lock);
>+	list_del_rcu(&port->list);
>+	spin_unlock(&port->sw->ports_lock);
>+
>+	free_netdev(dev);
>+}
>+
>+static void prestera_destroy_ports(struct prestera_switch *sw)
>+{
>+	struct prestera_port *port, *tmp;
>+	struct list_head remove_list;
>+
>+	INIT_LIST_HEAD(&remove_list);
>+
>+	spin_lock(&sw->ports_lock);
>+	list_splice_init(&sw->port_list, &remove_list);
>+	spin_unlock(&sw->ports_lock);
>+
>+	list_for_each_entry_safe(port, tmp, &remove_list, list)
>+		prestera_port_destroy(port);
>+}
>+
>+static int prestera_create_ports(struct prestera_switch *sw)
>+{
>+	u32 port;
>+	int err;
>+
>+	for (port = 0; port < sw->port_count; port++) {
>+		err = prestera_port_create(sw, port);
>+		if (err)
>+			goto err_ports_init;
>+	}
>+
>+	return 0;
>+
>+err_ports_init:
>+	prestera_destroy_ports(sw);
>+	return err;
>+}
>+
>+static void prestera_port_handle_event(struct prestera_switch *sw,
>+				       struct prestera_event *evt, void *arg)
>+{
>+	struct delayed_work *caching_dw;
>+	struct prestera_port *port;
>+
>+	port = prestera_find_port(sw, evt->port_evt.port_id);
>+	if (!port)
>+		return;
>+
>+	caching_dw = &port->cached_hw_stats.caching_dw;
>+
>+	if (evt->id == PRESTERA_PORT_EVENT_STATE_CHANGED) {
>+		if (evt->port_evt.data.oper_state) {
>+			netif_carrier_on(port->dev);
>+			if (!delayed_work_pending(caching_dw))
>+				queue_delayed_work(prestera_wq, caching_dw, 0);
>+		} else {
>+			netif_carrier_off(port->dev);
>+			if (delayed_work_pending(caching_dw))
>+				cancel_delayed_work(caching_dw);
>+		}
>+	}
>+}
>+
>+static void prestera_event_handlers_unregister(struct prestera_switch *sw)
>+{
>+	prestera_hw_event_handler_unregister(sw, PRESTERA_EVENT_TYPE_PORT,
>+					     prestera_port_handle_event);
>+}
>+
>+static int prestera_event_handlers_register(struct prestera_switch *sw)
>+{
>+	return prestera_hw_event_handler_register(sw, PRESTERA_EVENT_TYPE_PORT,
>+						  prestera_port_handle_event,
>+						  NULL);
>+}
>+
>+static int prestera_switch_init(struct prestera_switch *sw)
>+{
>+	int err;
>+
>+	err = prestera_hw_switch_init(sw);
>+	if (err) {
>+		dev_err(prestera_dev(sw), "Failed to init Switch device\n");
>+		return err;
>+	}
>+
>+	memcpy(sw->base_mac, base_mac_addr, sizeof(sw->base_mac));
>+	spin_lock_init(&sw->ports_lock);
>+	INIT_LIST_HEAD(&sw->port_list);
>+
>+	err = prestera_hw_switch_mac_set(sw, sw->base_mac);
>+	if (err)
>+		return err;
>+
>+	err = prestera_rxtx_switch_init(sw);
>+	if (err)
>+		return err;
>+
>+	err = prestera_event_handlers_register(sw);
>+	if (err)
>+		goto err_evt_handlers;
>+
>+	err = prestera_create_ports(sw);
>+	if (err)
>+		goto err_ports_create;
>+
>+	return 0;
>+
>+err_ports_create:

You are missing prestera_event_handlers_unregister(sw); call here.


>+err_evt_handlers:
>+	prestera_rxtx_switch_fini(sw);
>+
>+	return err;
>+}
>+
>+static void prestera_switch_fini(struct prestera_switch *sw)
>+{
>+	prestera_destroy_ports(sw);
>+	prestera_event_handlers_unregister(sw);
>+	prestera_rxtx_switch_fini(sw);
>+}
>+
>+int prestera_device_register(struct prestera_device *dev)
>+{
>+	struct prestera_switch *sw;
>+	int err;
>+
>+	sw = kzalloc(sizeof(*sw), GFP_KERNEL);
>+	if (!sw)
>+		return -ENOMEM;
>+
>+	dev->priv = sw;
>+	sw->dev = dev;
>+
>+	err = prestera_switch_init(sw);
>+	if (err) {
>+		kfree(sw);
>+		return err;
>+	}
>+
>+	registered_switch = sw;
>+	return 0;
>+}
>+EXPORT_SYMBOL(prestera_device_register);
>+
>+void prestera_device_unregister(struct prestera_device *dev)
>+{
>+	struct prestera_switch *sw = dev->priv;
>+
>+	registered_switch = NULL;
>+	prestera_switch_fini(sw);
>+	kfree(sw);
>+}
>+EXPORT_SYMBOL(prestera_device_unregister);
>+
>+static int __init prestera_module_init(void)
>+{
>+	if (!base_mac) {
>+		pr_err("[base_mac] parameter must be specified\n");
>+		return -EINVAL;
>+	}
>+	if (!mac_pton(base_mac, base_mac_addr)) {
>+		pr_err("[base_mac] parameter has invalid format\n");
>+		return -EINVAL;
>+	}
>+
>+	prestera_wq = alloc_workqueue("prestera", 0, 0);
>+	if (!prestera_wq)
>+		return -ENOMEM;
>+
>+	return 0;
>+}
>+
>+static void __exit prestera_module_exit(void)
>+{
>+	destroy_workqueue(prestera_wq);
>+}
>+
>+module_init(prestera_module_init);
>+module_exit(prestera_module_exit);
>+
>+MODULE_AUTHOR("Marvell Semi.");
>+MODULE_LICENSE("Dual BSD/GPL");
>+MODULE_DESCRIPTION("Marvell Prestera switch driver");
>+
>+module_param(base_mac, charp, 0);

No please.


[..]

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