linux/drivers/net/dsa/dsa_loop.c
Vladimir Oltean 2e554a7a5d net: dsa: propagate switchdev vlan_filtering prepare phase to drivers
A driver may refuse to enable VLAN filtering for any reason beyond what
the DSA framework cares about, such as:
- having tc-flower rules that rely on the switch being VLAN-aware
- the particular switch does not support VLAN, even if the driver does
  (the DSA framework just checks for the presence of the .port_vlan_add
  and .port_vlan_del pointers)
- simply not supporting this configuration to be toggled at runtime

Currently, when a driver rejects a configuration it cannot support, it
does this from the commit phase, which triggers various warnings in
switchdev.

So propagate the prepare phase to drivers, to give them the ability to
refuse invalid configurations cleanly and avoid the warnings.

Since we need to modify all function prototypes and check for the
prepare phase from within the drivers, take that opportunity and move
the existing driver restrictions within the prepare phase where that is
possible and easy.

Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Woojung Huh <woojung.huh@microchip.com>
Cc: Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
Cc: Sean Wang <sean.wang@mediatek.com>
Cc: Landen Chao <Landen.Chao@mediatek.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Vivien Didelot <vivien.didelot@gmail.com>
Cc: Jonathan McDowell <noodles@earth.li>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-10-05 05:56:48 -07:00

410 lines
9.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Distributed Switch Architecture loopback driver
*
* Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
*/
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/export.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/if_bridge.h>
#include <linux/dsa/loop.h>
#include <net/dsa.h>
#include "dsa_loop.h"
static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
[DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
[DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
};
static struct phy_device *phydevs[PHY_MAX_ADDR];
enum dsa_loop_devlink_resource_id {
DSA_LOOP_DEVLINK_PARAM_ID_VTU,
};
static u64 dsa_loop_devlink_vtu_get(void *priv)
{
struct dsa_loop_priv *ps = priv;
unsigned int i, count = 0;
struct dsa_loop_vlan *vl;
for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
vl = &ps->vlans[i];
if (vl->members)
count++;
}
return count;
}
static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
{
struct devlink_resource_size_params size_params;
struct dsa_loop_priv *ps = ds->priv;
int err;
devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
ARRAY_SIZE(ps->vlans),
1, DEVLINK_RESOURCE_UNIT_ENTRY);
err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
DSA_LOOP_DEVLINK_PARAM_ID_VTU,
DEVLINK_RESOURCE_ID_PARENT_TOP,
&size_params);
if (err)
goto out;
dsa_devlink_resource_occ_get_register(ds,
DSA_LOOP_DEVLINK_PARAM_ID_VTU,
dsa_loop_devlink_vtu_get, ps);
return 0;
out:
dsa_devlink_resources_unregister(ds);
return err;
}
static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
int port,
enum dsa_tag_protocol mp)
{
dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
return DSA_TAG_PROTO_NONE;
}
static int dsa_loop_setup(struct dsa_switch *ds)
{
struct dsa_loop_priv *ps = ds->priv;
unsigned int i;
for (i = 0; i < ds->num_ports; i++)
memcpy(ps->ports[i].mib, dsa_loop_mibs,
sizeof(dsa_loop_mibs));
dev_dbg(ds->dev, "%s\n", __func__);
return dsa_loop_setup_devlink_resources(ds);
}
static void dsa_loop_teardown(struct dsa_switch *ds)
{
dsa_devlink_resources_unregister(ds);
}
static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
{
if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
return 0;
return __DSA_LOOP_CNT_MAX;
}
static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
u32 stringset, uint8_t *data)
{
struct dsa_loop_priv *ps = ds->priv;
unsigned int i;
if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
return;
for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
memcpy(data + i * ETH_GSTRING_LEN,
ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
}
static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
uint64_t *data)
{
struct dsa_loop_priv *ps = ds->priv;
unsigned int i;
for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
data[i] = ps->ports[port].mib[i].val;
}
static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
{
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
int ret;
ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
if (ret < 0)
ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
else
ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
return ret;
}
static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
int regnum, u16 value)
{
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
int ret;
ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
if (ret < 0)
ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
else
ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
return ret;
}
static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
struct net_device *bridge)
{
dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
__func__, port, bridge->name);
return 0;
}
static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
struct net_device *bridge)
{
dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
__func__, port, bridge->name);
}
static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
u8 state)
{
dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
__func__, port, state);
}
static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
bool vlan_filtering,
struct switchdev_trans *trans)
{
dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
__func__, port, vlan_filtering);
return 0;
}
static int
dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan)
{
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d",
__func__, port, vlan->vid_begin, vlan->vid_end);
/* Just do a sleeping operation to make lockdep checks effective */
mdiobus_read(bus, ps->port_base + port, MII_BMSR);
if (vlan->vid_end > ARRAY_SIZE(ps->vlans))
return -ERANGE;
return 0;
}
static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan)
{
bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
struct dsa_loop_vlan *vl;
u16 vid;
/* Just do a sleeping operation to make lockdep checks effective */
mdiobus_read(bus, ps->port_base + port, MII_BMSR);
for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
vl = &ps->vlans[vid];
vl->members |= BIT(port);
if (untagged)
vl->untagged |= BIT(port);
else
vl->untagged &= ~BIT(port);
dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
__func__, port, vid, untagged ? "un" : "", pvid);
}
if (pvid)
ps->ports[port].pvid = vid;
}
static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan)
{
bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
struct dsa_loop_priv *ps = ds->priv;
struct mii_bus *bus = ps->bus;
struct dsa_loop_vlan *vl;
u16 vid, pvid = ps->ports[port].pvid;
/* Just do a sleeping operation to make lockdep checks effective */
mdiobus_read(bus, ps->port_base + port, MII_BMSR);
for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
vl = &ps->vlans[vid];
vl->members &= ~BIT(port);
if (untagged)
vl->untagged &= ~BIT(port);
if (pvid == vid)
pvid = 1;
dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
__func__, port, vid, untagged ? "un" : "", pvid);
}
ps->ports[port].pvid = pvid;
return 0;
}
static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
int new_mtu)
{
struct dsa_loop_priv *priv = ds->priv;
priv->ports[port].mtu = new_mtu;
return 0;
}
static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
{
return ETH_MAX_MTU;
}
static const struct dsa_switch_ops dsa_loop_driver = {
.get_tag_protocol = dsa_loop_get_protocol,
.setup = dsa_loop_setup,
.teardown = dsa_loop_teardown,
.get_strings = dsa_loop_get_strings,
.get_ethtool_stats = dsa_loop_get_ethtool_stats,
.get_sset_count = dsa_loop_get_sset_count,
.get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
.phy_read = dsa_loop_phy_read,
.phy_write = dsa_loop_phy_write,
.port_bridge_join = dsa_loop_port_bridge_join,
.port_bridge_leave = dsa_loop_port_bridge_leave,
.port_stp_state_set = dsa_loop_port_stp_state_set,
.port_vlan_filtering = dsa_loop_port_vlan_filtering,
.port_vlan_prepare = dsa_loop_port_vlan_prepare,
.port_vlan_add = dsa_loop_port_vlan_add,
.port_vlan_del = dsa_loop_port_vlan_del,
.port_change_mtu = dsa_loop_port_change_mtu,
.port_max_mtu = dsa_loop_port_max_mtu,
};
static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
{
struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
struct dsa_loop_priv *ps;
struct dsa_switch *ds;
int ret;
if (!pdata)
return -ENODEV;
ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
if (!ds)
return -ENOMEM;
ds->dev = &mdiodev->dev;
ds->num_ports = DSA_LOOP_NUM_PORTS;
ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
if (!ps)
return -ENOMEM;
ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
if (!ps->netdev)
return -EPROBE_DEFER;
pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
ds->dev = &mdiodev->dev;
ds->ops = &dsa_loop_driver;
ds->priv = ps;
ds->configure_vlan_while_not_filtering = true;
ps->bus = mdiodev->bus;
dev_set_drvdata(&mdiodev->dev, ds);
ret = dsa_register_switch(ds);
if (!ret)
dev_info(&mdiodev->dev, "%s: 0x%0x\n",
pdata->name, pdata->enabled_ports);
return ret;
}
static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
{
struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
struct dsa_loop_priv *ps = ds->priv;
dsa_unregister_switch(ds);
dev_put(ps->netdev);
}
static struct mdio_driver dsa_loop_drv = {
.mdiodrv.driver = {
.name = "dsa-loop",
},
.probe = dsa_loop_drv_probe,
.remove = dsa_loop_drv_remove,
};
#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
static int __init dsa_loop_init(void)
{
struct fixed_phy_status status = {
.link = 1,
.speed = SPEED_100,
.duplex = DUPLEX_FULL,
};
unsigned int i;
for (i = 0; i < NUM_FIXED_PHYS; i++)
phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
return mdio_driver_register(&dsa_loop_drv);
}
module_init(dsa_loop_init);
static void __exit dsa_loop_exit(void)
{
unsigned int i;
mdio_driver_unregister(&dsa_loop_drv);
for (i = 0; i < NUM_FIXED_PHYS; i++)
if (!IS_ERR(phydevs[i]))
fixed_phy_unregister(phydevs[i]);
}
module_exit(dsa_loop_exit);
MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Fainelli");
MODULE_DESCRIPTION("DSA loopback driver");