789 lines
15 KiB
C
789 lines
15 KiB
C
/*
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* net/dsa/dsa2.c - Hardware switch handling, binding version 2
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* Copyright (c) 2008-2009 Marvell Semiconductor
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* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
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* Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/rtnetlink.h>
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#include <linux/of.h>
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#include <linux/of_net.h>
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#include "dsa_priv.h"
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static LIST_HEAD(dsa_tree_list);
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static DEFINE_MUTEX(dsa2_mutex);
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static const struct devlink_ops dsa_devlink_ops = {
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};
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static struct dsa_switch_tree *dsa_tree_find(int index)
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{
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struct dsa_switch_tree *dst;
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list_for_each_entry(dst, &dsa_tree_list, list)
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if (dst->index == index)
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return dst;
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return NULL;
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}
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static struct dsa_switch_tree *dsa_tree_alloc(int index)
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{
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struct dsa_switch_tree *dst;
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dst = kzalloc(sizeof(*dst), GFP_KERNEL);
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if (!dst)
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return NULL;
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dst->index = index;
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INIT_LIST_HEAD(&dst->list);
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list_add_tail(&dsa_tree_list, &dst->list);
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/* Initialize the reference counter to the number of switches, not 1 */
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kref_init(&dst->refcount);
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refcount_set(&dst->refcount.refcount, 0);
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return dst;
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}
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static void dsa_tree_free(struct dsa_switch_tree *dst)
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{
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list_del(&dst->list);
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kfree(dst);
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}
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static struct dsa_switch_tree *dsa_tree_touch(int index)
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{
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struct dsa_switch_tree *dst;
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dst = dsa_tree_find(index);
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if (!dst)
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dst = dsa_tree_alloc(index);
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return dst;
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}
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static void dsa_tree_get(struct dsa_switch_tree *dst)
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{
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kref_get(&dst->refcount);
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}
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static void dsa_tree_release(struct kref *ref)
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{
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struct dsa_switch_tree *dst;
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dst = container_of(ref, struct dsa_switch_tree, refcount);
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dsa_tree_free(dst);
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}
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static void dsa_tree_put(struct dsa_switch_tree *dst)
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{
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kref_put(&dst->refcount, dsa_tree_release);
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}
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static bool dsa_port_is_dsa(struct dsa_port *port)
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{
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return port->type == DSA_PORT_TYPE_DSA;
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}
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static bool dsa_port_is_cpu(struct dsa_port *port)
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{
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return port->type == DSA_PORT_TYPE_CPU;
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}
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static bool dsa_port_is_user(struct dsa_port *dp)
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{
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return dp->type == DSA_PORT_TYPE_USER;
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}
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static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
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struct device_node *dn)
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{
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struct dsa_switch *ds;
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struct dsa_port *dp;
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int device, port;
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for (device = 0; device < DSA_MAX_SWITCHES; device++) {
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ds = dst->ds[device];
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if (!ds)
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continue;
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for (port = 0; port < ds->num_ports; port++) {
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dp = &ds->ports[port];
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if (dp->dn == dn)
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return dp;
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}
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}
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return NULL;
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}
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static bool dsa_port_setup_routing_table(struct dsa_port *dp)
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{
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struct dsa_switch *ds = dp->ds;
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struct dsa_switch_tree *dst = ds->dst;
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struct device_node *dn = dp->dn;
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struct of_phandle_iterator it;
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struct dsa_port *link_dp;
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int err;
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of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
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link_dp = dsa_tree_find_port_by_node(dst, it.node);
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if (!link_dp) {
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of_node_put(it.node);
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return false;
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}
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ds->rtable[link_dp->ds->index] = dp->index;
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}
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return true;
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}
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static bool dsa_switch_setup_routing_table(struct dsa_switch *ds)
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{
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bool complete = true;
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struct dsa_port *dp;
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int i;
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for (i = 0; i < DSA_MAX_SWITCHES; i++)
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ds->rtable[i] = DSA_RTABLE_NONE;
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for (i = 0; i < ds->num_ports; i++) {
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dp = &ds->ports[i];
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if (dsa_port_is_dsa(dp)) {
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complete = dsa_port_setup_routing_table(dp);
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if (!complete)
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break;
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}
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}
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return complete;
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}
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static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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bool complete = true;
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int device;
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for (device = 0; device < DSA_MAX_SWITCHES; device++) {
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ds = dst->ds[device];
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if (!ds)
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continue;
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complete = dsa_switch_setup_routing_table(ds);
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if (!complete)
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break;
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}
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return complete;
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}
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static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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struct dsa_port *dp;
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int device, port;
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for (device = 0; device < DSA_MAX_SWITCHES; device++) {
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ds = dst->ds[device];
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if (!ds)
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continue;
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for (port = 0; port < ds->num_ports; port++) {
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dp = &ds->ports[port];
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if (dsa_port_is_cpu(dp))
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return dp;
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}
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}
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return NULL;
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}
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static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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struct dsa_port *dp;
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int device, port;
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/* DSA currently only supports a single CPU port */
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dst->cpu_dp = dsa_tree_find_first_cpu(dst);
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if (!dst->cpu_dp) {
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pr_warn("Tree has no master device\n");
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return -EINVAL;
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}
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/* Assign the default CPU port to all ports of the fabric */
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for (device = 0; device < DSA_MAX_SWITCHES; device++) {
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ds = dst->ds[device];
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if (!ds)
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continue;
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for (port = 0; port < ds->num_ports; port++) {
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dp = &ds->ports[port];
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if (dsa_port_is_user(dp))
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dp->cpu_dp = dst->cpu_dp;
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}
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}
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return 0;
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}
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static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
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{
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/* DSA currently only supports a single CPU port */
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dst->cpu_dp = NULL;
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}
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static int dsa_port_setup(struct dsa_port *dp)
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{
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struct dsa_switch *ds = dp->ds;
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int err;
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memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));
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err = devlink_port_register(ds->devlink, &dp->devlink_port, dp->index);
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if (err)
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return err;
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switch (dp->type) {
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case DSA_PORT_TYPE_UNUSED:
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break;
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case DSA_PORT_TYPE_CPU:
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case DSA_PORT_TYPE_DSA:
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err = dsa_port_fixed_link_register_of(dp);
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if (err) {
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dev_err(ds->dev, "failed to register fixed link for port %d.%d\n",
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ds->index, dp->index);
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return err;
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}
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break;
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case DSA_PORT_TYPE_USER:
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err = dsa_slave_create(dp);
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if (err)
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dev_err(ds->dev, "failed to create slave for port %d.%d\n",
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ds->index, dp->index);
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else
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devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
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break;
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}
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return 0;
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}
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static void dsa_port_teardown(struct dsa_port *dp)
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{
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devlink_port_unregister(&dp->devlink_port);
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switch (dp->type) {
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case DSA_PORT_TYPE_UNUSED:
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break;
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case DSA_PORT_TYPE_CPU:
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case DSA_PORT_TYPE_DSA:
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dsa_port_fixed_link_unregister_of(dp);
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break;
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case DSA_PORT_TYPE_USER:
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if (dp->slave) {
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dsa_slave_destroy(dp->slave);
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dp->slave = NULL;
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}
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break;
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}
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}
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static int dsa_switch_setup(struct dsa_switch *ds)
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{
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int err;
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/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
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* driver and before ops->setup() has run, since the switch drivers and
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* the slave MDIO bus driver rely on these values for probing PHY
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* devices or not
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*/
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ds->phys_mii_mask |= dsa_user_ports(ds);
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/* Add the switch to devlink before calling setup, so that setup can
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* add dpipe tables
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*/
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ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
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if (!ds->devlink)
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return -ENOMEM;
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err = devlink_register(ds->devlink, ds->dev);
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if (err)
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return err;
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err = ds->ops->setup(ds);
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if (err < 0)
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return err;
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err = dsa_switch_register_notifier(ds);
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if (err)
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return err;
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if (!ds->slave_mii_bus && ds->ops->phy_read) {
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ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
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if (!ds->slave_mii_bus)
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return -ENOMEM;
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dsa_slave_mii_bus_init(ds);
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err = mdiobus_register(ds->slave_mii_bus);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static void dsa_switch_teardown(struct dsa_switch *ds)
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{
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if (ds->slave_mii_bus && ds->ops->phy_read)
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mdiobus_unregister(ds->slave_mii_bus);
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dsa_switch_unregister_notifier(ds);
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if (ds->devlink) {
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devlink_unregister(ds->devlink);
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devlink_free(ds->devlink);
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ds->devlink = NULL;
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}
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}
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static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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struct dsa_port *dp;
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int device, port;
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int err;
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for (device = 0; device < DSA_MAX_SWITCHES; device++) {
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ds = dst->ds[device];
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if (!ds)
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continue;
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err = dsa_switch_setup(ds);
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if (err)
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return err;
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for (port = 0; port < ds->num_ports; port++) {
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dp = &ds->ports[port];
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err = dsa_port_setup(dp);
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if (err)
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return err;
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}
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}
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return 0;
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}
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static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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struct dsa_port *dp;
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int device, port;
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for (device = 0; device < DSA_MAX_SWITCHES; device++) {
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ds = dst->ds[device];
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if (!ds)
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continue;
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for (port = 0; port < ds->num_ports; port++) {
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dp = &ds->ports[port];
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dsa_port_teardown(dp);
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}
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dsa_switch_teardown(ds);
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}
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}
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static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
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{
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struct dsa_port *cpu_dp = dst->cpu_dp;
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struct net_device *master = cpu_dp->master;
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/* DSA currently supports a single pair of CPU port and master device */
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return dsa_master_setup(master, cpu_dp);
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}
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static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
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{
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struct dsa_port *cpu_dp = dst->cpu_dp;
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struct net_device *master = cpu_dp->master;
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return dsa_master_teardown(master);
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}
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static int dsa_tree_setup(struct dsa_switch_tree *dst)
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{
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bool complete;
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int err;
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if (dst->setup) {
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pr_err("DSA: tree %d already setup! Disjoint trees?\n",
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dst->index);
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return -EEXIST;
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}
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complete = dsa_tree_setup_routing_table(dst);
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if (!complete)
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return 0;
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err = dsa_tree_setup_default_cpu(dst);
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if (err)
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return err;
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err = dsa_tree_setup_switches(dst);
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if (err)
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return err;
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err = dsa_tree_setup_master(dst);
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if (err)
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return err;
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dst->setup = true;
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pr_info("DSA: tree %d setup\n", dst->index);
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return 0;
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}
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static void dsa_tree_teardown(struct dsa_switch_tree *dst)
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{
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if (!dst->setup)
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return;
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dsa_tree_teardown_master(dst);
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dsa_tree_teardown_switches(dst);
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dsa_tree_teardown_default_cpu(dst);
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pr_info("DSA: tree %d torn down\n", dst->index);
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dst->setup = false;
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}
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static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
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unsigned int index)
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{
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dsa_tree_teardown(dst);
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dst->ds[index] = NULL;
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dsa_tree_put(dst);
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}
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static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
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struct dsa_switch *ds)
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{
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unsigned int index = ds->index;
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int err;
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if (dst->ds[index])
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return -EBUSY;
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dsa_tree_get(dst);
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dst->ds[index] = ds;
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err = dsa_tree_setup(dst);
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if (err)
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dsa_tree_remove_switch(dst, index);
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return err;
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}
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static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
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{
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if (!name)
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name = "eth%d";
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dp->type = DSA_PORT_TYPE_USER;
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dp->name = name;
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return 0;
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}
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static int dsa_port_parse_dsa(struct dsa_port *dp)
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{
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dp->type = DSA_PORT_TYPE_DSA;
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return 0;
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}
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static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
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{
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struct dsa_switch *ds = dp->ds;
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struct dsa_switch_tree *dst = ds->dst;
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const struct dsa_device_ops *tag_ops;
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enum dsa_tag_protocol tag_protocol;
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tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
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tag_ops = dsa_resolve_tag_protocol(tag_protocol);
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if (IS_ERR(tag_ops)) {
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dev_warn(ds->dev, "No tagger for this switch\n");
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return PTR_ERR(tag_ops);
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}
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dp->type = DSA_PORT_TYPE_CPU;
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dp->rcv = tag_ops->rcv;
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dp->tag_ops = tag_ops;
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dp->master = master;
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dp->dst = dst;
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return 0;
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}
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static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
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{
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struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
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const char *name = of_get_property(dn, "label", NULL);
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bool link = of_property_read_bool(dn, "link");
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dp->dn = dn;
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if (ethernet) {
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struct net_device *master;
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master = of_find_net_device_by_node(ethernet);
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if (!master)
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return -EPROBE_DEFER;
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|
|
|
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;
|
|
u32 reg;
|
|
int err;
|
|
|
|
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", ®);
|
|
if (err)
|
|
return err;
|
|
|
|
if (reg >= ds->num_ports)
|
|
return -EINVAL;
|
|
|
|
dp = &ds->ports[reg];
|
|
|
|
err = dsa_port_parse_of(dp, port);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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];
|
|
if (ds->index >= DSA_MAX_SWITCHES)
|
|
return -EINVAL;
|
|
|
|
ds->dst = dsa_tree_touch(m[0]);
|
|
if (!ds->dst)
|
|
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;
|
|
|
|
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 = &ds->ports[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)
|
|
{
|
|
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;
|
|
|
|
return dsa_switch_parse_ports(ds, cd);
|
|
}
|
|
|
|
static int dsa_switch_add(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_switch_tree *dst = ds->dst;
|
|
|
|
return dsa_tree_add_switch(dst, ds);
|
|
}
|
|
|
|
static int dsa_switch_probe(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_chip_data *pdata = ds->dev->platform_data;
|
|
struct device_node *np = ds->dev->of_node;
|
|
int err;
|
|
|
|
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;
|
|
|
|
return dsa_switch_add(ds);
|
|
}
|
|
|
|
struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
|
|
{
|
|
size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
|
|
struct dsa_switch *ds;
|
|
int i;
|
|
|
|
ds = devm_kzalloc(dev, size, GFP_KERNEL);
|
|
if (!ds)
|
|
return NULL;
|
|
|
|
ds->dev = dev;
|
|
ds->num_ports = n;
|
|
|
|
for (i = 0; i < ds->num_ports; ++i) {
|
|
ds->ports[i].index = i;
|
|
ds->ports[i].ds = ds;
|
|
}
|
|
|
|
return ds;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_switch_alloc);
|
|
|
|
int dsa_register_switch(struct dsa_switch *ds)
|
|
{
|
|
int err;
|
|
|
|
mutex_lock(&dsa2_mutex);
|
|
err = dsa_switch_probe(ds);
|
|
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;
|
|
unsigned int index = ds->index;
|
|
|
|
dsa_tree_remove_switch(dst, index);
|
|
}
|
|
|
|
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);
|