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linux/net/dsa/dsa2.c
Florian Fainelli 4d776482ec net: dsa: Get information about stacked DSA protocol 
It is possible to stack multiple DSA switches in a way that they are not
part of the tree (disjoint) but the DSA master of a switch is a DSA
slave of another. When that happens switch drivers may have to know this
is the case so as to determine whether their tagging protocol has a
remove chance of working.

This is useful for specific switch drivers such as b53 where devices
have been known to be stacked in the wild without the Broadcom tag
protocol supporting that feature. This allows b53 to continue supporting
those devices by forcing the disabling of Broadcom tags on the outermost
switches if necessary.

The get_tag_protocol() function is therefore updated to gain an
additional enum dsa_tag_protocol argument which denotes the current
tagging protocol used by the DSA master we are attached to, else
DSA_TAG_PROTO_NONE for the top of the dsa_switch_tree.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-01-08 16:01:13 -08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/dsa/dsa2.c - Hardware switch handling, binding version 2
* Copyright (c) 2008-2009 Marvell Semiconductor
* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
* Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <net/devlink.h>
#include "dsa_priv.h"
static LIST_HEAD(dsa_tree_list);
static DEFINE_MUTEX(dsa2_mutex);
static const struct devlink_ops dsa_devlink_ops = {
};
static struct dsa_switch_tree *dsa_tree_find(int index)
{
struct dsa_switch_tree *dst;
list_for_each_entry(dst, &dsa_tree_list, list)
if (dst->index == index)
return dst;
return NULL;
}
static struct dsa_switch_tree *dsa_tree_alloc(int index)
{
struct dsa_switch_tree *dst;
dst = kzalloc(sizeof(*dst), GFP_KERNEL);
if (!dst)
return NULL;
dst->index = index;
INIT_LIST_HEAD(&dst->rtable);
INIT_LIST_HEAD(&dst->ports);
INIT_LIST_HEAD(&dst->list);
list_add_tail(&dst->list, &dsa_tree_list);
kref_init(&dst->refcount);
return dst;
}
static void dsa_tree_free(struct dsa_switch_tree *dst)
{
list_del(&dst->list);
kfree(dst);
}
static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
{
if (dst)
kref_get(&dst->refcount);
return dst;
}
static struct dsa_switch_tree *dsa_tree_touch(int index)
{
struct dsa_switch_tree *dst;
dst = dsa_tree_find(index);
if (dst)
return dsa_tree_get(dst);
else
return dsa_tree_alloc(index);
}
static void dsa_tree_release(struct kref *ref)
{
struct dsa_switch_tree *dst;
dst = container_of(ref, struct dsa_switch_tree, refcount);
dsa_tree_free(dst);
}
static void dsa_tree_put(struct dsa_switch_tree *dst)
{
if (dst)
kref_put(&dst->refcount, dsa_tree_release);
}
static bool dsa_port_is_dsa(struct dsa_port *port)
{
return port->type == DSA_PORT_TYPE_DSA;
}
static bool dsa_port_is_cpu(struct dsa_port *port)
{
return port->type == DSA_PORT_TYPE_CPU;
}
static bool dsa_port_is_user(struct dsa_port *dp)
{
return dp->type == DSA_PORT_TYPE_USER;
}
static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
struct device_node *dn)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dp->dn == dn)
return dp;
return NULL;
}
static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
struct dsa_port *link_dp)
{
struct dsa_switch *ds = dp->ds;
struct dsa_switch_tree *dst;
struct dsa_link *dl;
dst = ds->dst;
list_for_each_entry(dl, &dst->rtable, list)
if (dl->dp == dp && dl->link_dp == link_dp)
return dl;
dl = kzalloc(sizeof(*dl), GFP_KERNEL);
if (!dl)
return NULL;
dl->dp = dp;
dl->link_dp = link_dp;
INIT_LIST_HEAD(&dl->list);
list_add_tail(&dl->list, &dst->rtable);
return dl;
}
static bool dsa_port_setup_routing_table(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
struct dsa_switch_tree *dst = ds->dst;
struct device_node *dn = dp->dn;
struct of_phandle_iterator it;
struct dsa_port *link_dp;
struct dsa_link *dl;
int err;
of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
link_dp = dsa_tree_find_port_by_node(dst, it.node);
if (!link_dp) {
of_node_put(it.node);
return false;
}
dl = dsa_link_touch(dp, link_dp);
if (!dl) {
of_node_put(it.node);
return false;
}
}
return true;
}
static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
{
bool complete = true;
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list) {
if (dsa_port_is_dsa(dp)) {
complete = dsa_port_setup_routing_table(dp);
if (!complete)
break;
}
}
return complete;
}
static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_cpu(dp))
return dp;
return NULL;
}
static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
{
struct dsa_port *cpu_dp, *dp;
cpu_dp = dsa_tree_find_first_cpu(dst);
if (!cpu_dp) {
pr_err("DSA: tree %d has no CPU port\n", dst->index);
return -EINVAL;
}
/* Assign the default CPU port to all ports of the fabric */
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
dp->cpu_dp = cpu_dp;
return 0;
}
static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
dp->cpu_dp = NULL;
}
static int dsa_port_setup(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
struct dsa_switch_tree *dst = ds->dst;
const unsigned char *id = (const unsigned char *)&dst->index;
const unsigned char len = sizeof(dst->index);
struct devlink_port *dlp = &dp->devlink_port;
bool dsa_port_link_registered = false;
bool devlink_port_registered = false;
struct devlink *dl = ds->devlink;
bool dsa_port_enabled = false;
int err = 0;
if (dp->setup)
return 0;
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
dsa_port_disable(dp);
break;
case DSA_PORT_TYPE_CPU:
memset(dlp, 0, sizeof(*dlp));
devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_CPU,
dp->index, false, 0, id, len);
err = devlink_port_register(dl, dlp, dp->index);
if (err)
break;
devlink_port_registered = true;
err = dsa_port_link_register_of(dp);
if (err)
break;
dsa_port_link_registered = true;
err = dsa_port_enable(dp, NULL);
if (err)
break;
dsa_port_enabled = true;
break;
case DSA_PORT_TYPE_DSA:
memset(dlp, 0, sizeof(*dlp));
devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_DSA,
dp->index, false, 0, id, len);
err = devlink_port_register(dl, dlp, dp->index);
if (err)
break;
devlink_port_registered = true;
err = dsa_port_link_register_of(dp);
if (err)
break;
dsa_port_link_registered = true;
err = dsa_port_enable(dp, NULL);
if (err)
break;
dsa_port_enabled = true;
break;
case DSA_PORT_TYPE_USER:
memset(dlp, 0, sizeof(*dlp));
devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_PHYSICAL,
dp->index, false, 0, id, len);
err = devlink_port_register(dl, dlp, dp->index);
if (err)
break;
devlink_port_registered = true;
dp->mac = of_get_mac_address(dp->dn);
err = dsa_slave_create(dp);
if (err)
break;
devlink_port_type_eth_set(dlp, dp->slave);
break;
}
if (err && dsa_port_enabled)
dsa_port_disable(dp);
if (err && dsa_port_link_registered)
dsa_port_link_unregister_of(dp);
if (err && devlink_port_registered)
devlink_port_unregister(dlp);
if (err)
return err;
dp->setup = true;
return 0;
}
static void dsa_port_teardown(struct dsa_port *dp)
{
struct devlink_port *dlp = &dp->devlink_port;
if (!dp->setup)
return;
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
break;
case DSA_PORT_TYPE_CPU:
dsa_port_disable(dp);
dsa_tag_driver_put(dp->tag_ops);
devlink_port_unregister(dlp);
dsa_port_link_unregister_of(dp);
break;
case DSA_PORT_TYPE_DSA:
dsa_port_disable(dp);
devlink_port_unregister(dlp);
dsa_port_link_unregister_of(dp);
break;
case DSA_PORT_TYPE_USER:
devlink_port_unregister(dlp);
if (dp->slave) {
dsa_slave_destroy(dp->slave);
dp->slave = NULL;
}
break;
}
dp->setup = false;
}
static int dsa_switch_setup(struct dsa_switch *ds)
{
struct dsa_devlink_priv *dl_priv;
int err;
if (ds->setup)
return 0;
/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
* driver and before ops->setup() has run, since the switch drivers and
* the slave MDIO bus driver rely on these values for probing PHY
* devices or not
*/
ds->phys_mii_mask |= dsa_user_ports(ds);
/* Add the switch to devlink before calling setup, so that setup can
* add dpipe tables
*/
ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv));
if (!ds->devlink)
return -ENOMEM;
dl_priv = devlink_priv(ds->devlink);
dl_priv->ds = ds;
err = devlink_register(ds->devlink, ds->dev);
if (err)
goto free_devlink;
err = dsa_switch_register_notifier(ds);
if (err)
goto unregister_devlink;
err = ds->ops->setup(ds);
if (err < 0)
goto unregister_notifier;
devlink_params_publish(ds->devlink);
if (!ds->slave_mii_bus && ds->ops->phy_read) {
ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
if (!ds->slave_mii_bus) {
err = -ENOMEM;
goto unregister_notifier;
}
dsa_slave_mii_bus_init(ds);
err = mdiobus_register(ds->slave_mii_bus);
if (err < 0)
goto unregister_notifier;
}
ds->setup = true;
return 0;
unregister_notifier:
dsa_switch_unregister_notifier(ds);
unregister_devlink:
devlink_unregister(ds->devlink);
free_devlink:
devlink_free(ds->devlink);
ds->devlink = NULL;
return err;
}
static void dsa_switch_teardown(struct dsa_switch *ds)
{
if (!ds->setup)
return;
if (ds->slave_mii_bus && ds->ops->phy_read)
mdiobus_unregister(ds->slave_mii_bus);
dsa_switch_unregister_notifier(ds);
if (ds->ops->teardown)
ds->ops->teardown(ds);
if (ds->devlink) {
devlink_unregister(ds->devlink);
devlink_free(ds->devlink);
ds->devlink = NULL;
}
ds->setup = false;
}
static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
int err;
list_for_each_entry(dp, &dst->ports, list) {
err = dsa_switch_setup(dp->ds);
if (err)
goto teardown;
}
list_for_each_entry(dp, &dst->ports, list) {
err = dsa_port_setup(dp);
if (err)
goto teardown;
}
return 0;
teardown:
list_for_each_entry(dp, &dst->ports, list)
dsa_port_teardown(dp);
list_for_each_entry(dp, &dst->ports, list)
dsa_switch_teardown(dp->ds);
return err;
}
static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
dsa_port_teardown(dp);
list_for_each_entry(dp, &dst->ports, list)
dsa_switch_teardown(dp->ds);
}
static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
int err;
list_for_each_entry(dp, &dst->ports, list) {
if (dsa_port_is_cpu(dp)) {
err = dsa_master_setup(dp->master, dp);
if (err)
return err;
}
}
return 0;
}
static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_cpu(dp))
dsa_master_teardown(dp->master);
}
static int dsa_tree_setup(struct dsa_switch_tree *dst)
{
bool complete;
int err;
if (dst->setup) {
pr_err("DSA: tree %d already setup! Disjoint trees?\n",
dst->index);
return -EEXIST;
}
complete = dsa_tree_setup_routing_table(dst);
if (!complete)
return 0;
err = dsa_tree_setup_default_cpu(dst);
if (err)
return err;
err = dsa_tree_setup_switches(dst);
if (err)
goto teardown_default_cpu;
err = dsa_tree_setup_master(dst);
if (err)
goto teardown_switches;
dst->setup = true;
pr_info("DSA: tree %d setup\n", dst->index);
return 0;
teardown_switches:
dsa_tree_teardown_switches(dst);
teardown_default_cpu:
dsa_tree_teardown_default_cpu(dst);
return err;
}
static void dsa_tree_teardown(struct dsa_switch_tree *dst)
{
struct dsa_link *dl, *next;
if (!dst->setup)
return;
dsa_tree_teardown_master(dst);
dsa_tree_teardown_switches(dst);
dsa_tree_teardown_default_cpu(dst);
list_for_each_entry_safe(dl, next, &dst->rtable, list) {
list_del(&dl->list);
kfree(dl);
}
pr_info("DSA: tree %d torn down\n", dst->index);
dst->setup = false;
}
static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
{
struct dsa_switch_tree *dst = ds->dst;
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dp->ds == ds && dp->index == index)
return dp;
dp = kzalloc(sizeof(*dp), GFP_KERNEL);
if (!dp)
return NULL;
dp->ds = ds;
dp->index = index;
INIT_LIST_HEAD(&dp->list);
list_add_tail(&dp->list, &dst->ports);
return dp;
}
static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
{
if (!name)
name = "eth%d";
dp->type = DSA_PORT_TYPE_USER;
dp->name = name;
return 0;
}
static int dsa_port_parse_dsa(struct dsa_port *dp)
{
dp->type = DSA_PORT_TYPE_DSA;
return 0;
}
static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp,
struct net_device *master)
{
enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE;
struct dsa_switch *mds, *ds = dp->ds;
unsigned int mdp_upstream;
struct dsa_port *mdp;
/* It is possible to stack DSA switches onto one another when that
* happens the switch driver may want to know if its tagging protocol
* is going to work in such a configuration.
*/
if (dsa_slave_dev_check(master)) {
mdp = dsa_slave_to_port(master);
mds = mdp->ds;
mdp_upstream = dsa_upstream_port(mds, mdp->index);
tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream,
DSA_TAG_PROTO_NONE);
}
/* If the master device is not itself a DSA slave in a disjoint DSA
* tree, then return immediately.
*/
return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol);
}
static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
{
struct dsa_switch *ds = dp->ds;
struct dsa_switch_tree *dst = ds->dst;
const struct dsa_device_ops *tag_ops;
enum dsa_tag_protocol tag_protocol;
tag_protocol = dsa_get_tag_protocol(dp, master);
tag_ops = dsa_tag_driver_get(tag_protocol);
if (IS_ERR(tag_ops)) {
if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
return -EPROBE_DEFER;
dev_warn(ds->dev, "No tagger for this switch\n");
dp->master = NULL;
return PTR_ERR(tag_ops);
}
dp->master = master;
dp->type = DSA_PORT_TYPE_CPU;
dp->filter = tag_ops->filter;
dp->rcv = tag_ops->rcv;
dp->tag_ops = tag_ops;
dp->dst = dst;
return 0;
}
static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
{
struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
const char *name = of_get_property(dn, "label", NULL);
bool link = of_property_read_bool(dn, "link");
dp->dn = dn;
if (ethernet) {
struct net_device *master;
master = of_find_net_device_by_node(ethernet);
if (!master)
return -EPROBE_DEFER;
return dsa_port_parse_cpu(dp, master);
}
if (link)
return dsa_port_parse_dsa(dp);
return dsa_port_parse_user(dp, name);
}
static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
struct device_node *dn)
{
struct device_node *ports, *port;
struct dsa_port *dp;
int err = 0;
u32 reg;
ports = of_get_child_by_name(dn, "ports");
if (!ports) {
dev_err(ds->dev, "no ports child node found\n");
return -EINVAL;
}
for_each_available_child_of_node(ports, port) {
err = of_property_read_u32(port, "reg", &reg);
if (err)
goto out_put_node;
if (reg >= ds->num_ports) {
err = -EINVAL;
goto out_put_node;
}
dp = dsa_to_port(ds, reg);
err = dsa_port_parse_of(dp, port);
if (err)
goto out_put_node;
}
out_put_node:
of_node_put(ports);
return err;
}
static int dsa_switch_parse_member_of(struct dsa_switch *ds,
struct device_node *dn)
{
u32 m[2] = { 0, 0 };
int sz;
/* Don't error out if this optional property isn't found */
sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
if (sz < 0 && sz != -EINVAL)
return sz;
ds->index = m[1];
ds->dst = dsa_tree_touch(m[0]);
if (!ds->dst)
return -ENOMEM;
return 0;
}
static int dsa_switch_touch_ports(struct dsa_switch *ds)
{
struct dsa_port *dp;
int port;
for (port = 0; port < ds->num_ports; port++) {
dp = dsa_port_touch(ds, port);
if (!dp)
return -ENOMEM;
}
return 0;
}
static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
{
int err;
err = dsa_switch_parse_member_of(ds, dn);
if (err)
return err;
err = dsa_switch_touch_ports(ds);
if (err)
return err;
return dsa_switch_parse_ports_of(ds, dn);
}
static int dsa_port_parse(struct dsa_port *dp, const char *name,
struct device *dev)
{
if (!strcmp(name, "cpu")) {
struct net_device *master;
master = dsa_dev_to_net_device(dev);
if (!master)
return -EPROBE_DEFER;
dev_put(master);
return dsa_port_parse_cpu(dp, master);
}
if (!strcmp(name, "dsa"))
return dsa_port_parse_dsa(dp);
return dsa_port_parse_user(dp, name);
}
static int dsa_switch_parse_ports(struct dsa_switch *ds,
struct dsa_chip_data *cd)
{
bool valid_name_found = false;
struct dsa_port *dp;
struct device *dev;
const char *name;
unsigned int i;
int err;
for (i = 0; i < DSA_MAX_PORTS; i++) {
name = cd->port_names[i];
dev = cd->netdev[i];
dp = dsa_to_port(ds, i);
if (!name)
continue;
err = dsa_port_parse(dp, name, dev);
if (err)
return err;
valid_name_found = true;
}
if (!valid_name_found && i == DSA_MAX_PORTS)
return -EINVAL;
return 0;
}
static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
{
int err;
ds->cd = cd;
/* We don't support interconnected switches nor multiple trees via
* platform data, so this is the unique switch of the tree.
*/
ds->index = 0;
ds->dst = dsa_tree_touch(0);
if (!ds->dst)
return -ENOMEM;
err = dsa_switch_touch_ports(ds);
if (err)
return err;
return dsa_switch_parse_ports(ds, cd);
}
static int dsa_switch_probe(struct dsa_switch *ds)
{
struct dsa_switch_tree *dst;
struct dsa_chip_data *pdata;
struct device_node *np;
int err;
if (!ds->dev)
return -ENODEV;
pdata = ds->dev->platform_data;
np = ds->dev->of_node;
if (!ds->num_ports)
return -EINVAL;
if (np)
err = dsa_switch_parse_of(ds, np);
else if (pdata)
err = dsa_switch_parse(ds, pdata);
else
err = -ENODEV;
if (err)
return err;
dst = ds->dst;
dsa_tree_get(dst);
err = dsa_tree_setup(dst);
if (err)
dsa_tree_put(dst);
return err;
}
int dsa_register_switch(struct dsa_switch *ds)
{
int err;
mutex_lock(&dsa2_mutex);
err = dsa_switch_probe(ds);
dsa_tree_put(ds->dst);
mutex_unlock(&dsa2_mutex);
return err;
}
EXPORT_SYMBOL_GPL(dsa_register_switch);
static void dsa_switch_remove(struct dsa_switch *ds)
{
struct dsa_switch_tree *dst = ds->dst;
struct dsa_port *dp, *next;
dsa_tree_teardown(dst);
list_for_each_entry_safe(dp, next, &dst->ports, list) {
list_del(&dp->list);
kfree(dp);
}
dsa_tree_put(dst);
}
void dsa_unregister_switch(struct dsa_switch *ds)
{
mutex_lock(&dsa2_mutex);
dsa_switch_remove(ds);
mutex_unlock(&dsa2_mutex);
}
EXPORT_SYMBOL_GPL(dsa_unregister_switch);
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