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1372 lines
29 KiB
C
1372 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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 <net/devlink.h>
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#include "dsa_priv.h"
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static DEFINE_MUTEX(dsa2_mutex);
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LIST_HEAD(dsa_tree_list);
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/**
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* dsa_tree_notify - Execute code for all switches in a DSA switch tree.
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* @dst: collection of struct dsa_switch devices to notify.
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* @e: event, must be of type DSA_NOTIFIER_*
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* @v: event-specific value.
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*
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* Given a struct dsa_switch_tree, this can be used to run a function once for
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* each member DSA switch. The other alternative of traversing the tree is only
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* through its ports list, which does not uniquely list the switches.
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*/
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int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v)
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{
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struct raw_notifier_head *nh = &dst->nh;
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int err;
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err = raw_notifier_call_chain(nh, e, v);
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return notifier_to_errno(err);
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}
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/**
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* dsa_broadcast - Notify all DSA trees in the system.
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* @e: event, must be of type DSA_NOTIFIER_*
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* @v: event-specific value.
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*
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* Can be used to notify the switching fabric of events such as cross-chip
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* bridging between disjoint trees (such as islands of tagger-compatible
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* switches bridged by an incompatible middle switch).
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*/
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int dsa_broadcast(unsigned long e, void *v)
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{
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struct dsa_switch_tree *dst;
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int err = 0;
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list_for_each_entry(dst, &dsa_tree_list, list) {
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err = dsa_tree_notify(dst, e, v);
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if (err)
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break;
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}
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return err;
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}
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/**
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* dsa_lag_map() - Map LAG netdev to a linear LAG ID
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* @dst: Tree in which to record the mapping.
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* @lag: Netdev that is to be mapped to an ID.
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*
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* dsa_lag_id/dsa_lag_dev can then be used to translate between the
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* two spaces. The size of the mapping space is determined by the
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* driver by setting ds->num_lag_ids. It is perfectly legal to leave
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* it unset if it is not needed, in which case these functions become
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* no-ops.
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*/
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void dsa_lag_map(struct dsa_switch_tree *dst, struct net_device *lag)
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{
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unsigned int id;
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if (dsa_lag_id(dst, lag) >= 0)
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/* Already mapped */
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return;
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for (id = 0; id < dst->lags_len; id++) {
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if (!dsa_lag_dev(dst, id)) {
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dst->lags[id] = lag;
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return;
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}
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}
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/* No IDs left, which is OK. Some drivers do not need it. The
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* ones that do, e.g. mv88e6xxx, will discover that dsa_lag_id
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* returns an error for this device when joining the LAG. The
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* driver can then return -EOPNOTSUPP back to DSA, which will
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* fall back to a software LAG.
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*/
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}
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/**
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* dsa_lag_unmap() - Remove a LAG ID mapping
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* @dst: Tree in which the mapping is recorded.
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* @lag: Netdev that was mapped.
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*
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* As there may be multiple users of the mapping, it is only removed
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* if there are no other references to it.
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*/
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void dsa_lag_unmap(struct dsa_switch_tree *dst, struct net_device *lag)
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{
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struct dsa_port *dp;
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unsigned int id;
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dsa_lag_foreach_port(dp, dst, lag)
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/* There are remaining users of this mapping */
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return;
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dsa_lags_foreach_id(id, dst) {
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if (dsa_lag_dev(dst, id) == lag) {
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dst->lags[id] = NULL;
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break;
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}
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}
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}
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struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
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{
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struct dsa_switch_tree *dst;
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struct dsa_port *dp;
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list_for_each_entry(dst, &dsa_tree_list, list) {
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if (dst->index != tree_index)
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continue;
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list_for_each_entry(dp, &dst->ports, list) {
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if (dp->ds->index != sw_index)
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continue;
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return dp->ds;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(dsa_switch_find);
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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->rtable);
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INIT_LIST_HEAD(&dst->ports);
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INIT_LIST_HEAD(&dst->list);
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list_add_tail(&dst->list, &dsa_tree_list);
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kref_init(&dst->refcount);
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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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if (dst->tag_ops)
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dsa_tag_driver_put(dst->tag_ops);
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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_get(struct dsa_switch_tree *dst)
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{
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if (dst)
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kref_get(&dst->refcount);
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return 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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return dsa_tree_get(dst);
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else
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return dsa_tree_alloc(index);
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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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if (dst)
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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_port *dp;
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list_for_each_entry(dp, &dst->ports, list)
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if (dp->dn == dn)
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return dp;
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return NULL;
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}
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static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
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struct dsa_port *link_dp)
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{
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struct dsa_switch *ds = dp->ds;
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struct dsa_switch_tree *dst;
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struct dsa_link *dl;
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dst = ds->dst;
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list_for_each_entry(dl, &dst->rtable, list)
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if (dl->dp == dp && dl->link_dp == link_dp)
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return dl;
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dl = kzalloc(sizeof(*dl), GFP_KERNEL);
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if (!dl)
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return NULL;
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dl->dp = dp;
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dl->link_dp = link_dp;
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INIT_LIST_HEAD(&dl->list);
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list_add_tail(&dl->list, &dst->rtable);
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return dl;
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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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struct dsa_link *dl;
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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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dl = dsa_link_touch(dp, link_dp);
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if (!dl) {
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of_node_put(it.node);
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return false;
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}
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}
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return true;
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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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bool complete = true;
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struct dsa_port *dp;
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list_for_each_entry(dp, &dst->ports, list) {
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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 struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
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{
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struct dsa_port *dp;
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list_for_each_entry(dp, &dst->ports, list)
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if (dsa_port_is_cpu(dp))
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return dp;
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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_port *cpu_dp, *dp;
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cpu_dp = dsa_tree_find_first_cpu(dst);
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if (!cpu_dp) {
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pr_err("DSA: tree %d has no CPU port\n", dst->index);
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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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list_for_each_entry(dp, &dst->ports, list)
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if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
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dp->cpu_dp = cpu_dp;
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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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struct dsa_port *dp;
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list_for_each_entry(dp, &dst->ports, list)
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if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
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dp->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 devlink_port *dlp = &dp->devlink_port;
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bool dsa_port_link_registered = false;
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bool dsa_port_enabled = false;
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int err = 0;
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if (dp->setup)
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return 0;
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switch (dp->type) {
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case DSA_PORT_TYPE_UNUSED:
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dsa_port_disable(dp);
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break;
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case DSA_PORT_TYPE_CPU:
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err = dsa_port_link_register_of(dp);
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if (err)
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break;
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dsa_port_link_registered = true;
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err = dsa_port_enable(dp, NULL);
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if (err)
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break;
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dsa_port_enabled = true;
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break;
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case DSA_PORT_TYPE_DSA:
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err = dsa_port_link_register_of(dp);
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if (err)
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break;
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dsa_port_link_registered = true;
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err = dsa_port_enable(dp, NULL);
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if (err)
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break;
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dsa_port_enabled = true;
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break;
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case DSA_PORT_TYPE_USER:
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dp->mac = of_get_mac_address(dp->dn);
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err = dsa_slave_create(dp);
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if (err)
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break;
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devlink_port_type_eth_set(dlp, dp->slave);
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break;
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}
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if (err && dsa_port_enabled)
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dsa_port_disable(dp);
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if (err && dsa_port_link_registered)
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dsa_port_link_unregister_of(dp);
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if (err)
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return err;
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dp->setup = true;
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return 0;
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}
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static int dsa_port_devlink_setup(struct dsa_port *dp)
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{
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struct devlink_port *dlp = &dp->devlink_port;
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struct dsa_switch_tree *dst = dp->ds->dst;
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struct devlink_port_attrs attrs = {};
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struct devlink *dl = dp->ds->devlink;
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const unsigned char *id;
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unsigned char len;
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int err;
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id = (const unsigned char *)&dst->index;
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len = sizeof(dst->index);
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attrs.phys.port_number = dp->index;
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memcpy(attrs.switch_id.id, id, len);
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attrs.switch_id.id_len = len;
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memset(dlp, 0, sizeof(*dlp));
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switch (dp->type) {
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case DSA_PORT_TYPE_UNUSED:
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attrs.flavour = DEVLINK_PORT_FLAVOUR_UNUSED;
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break;
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case DSA_PORT_TYPE_CPU:
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attrs.flavour = DEVLINK_PORT_FLAVOUR_CPU;
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break;
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case DSA_PORT_TYPE_DSA:
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attrs.flavour = DEVLINK_PORT_FLAVOUR_DSA;
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break;
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case DSA_PORT_TYPE_USER:
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attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
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break;
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}
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devlink_port_attrs_set(dlp, &attrs);
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err = devlink_port_register(dl, dlp, dp->index);
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if (!err)
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dp->devlink_port_setup = true;
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return err;
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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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struct devlink_port *dlp = &dp->devlink_port;
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if (!dp->setup)
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return;
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devlink_port_type_clear(dlp);
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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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dsa_port_disable(dp);
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dsa_port_link_unregister_of(dp);
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break;
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case DSA_PORT_TYPE_DSA:
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dsa_port_disable(dp);
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dsa_port_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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dp->setup = false;
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}
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static void dsa_port_devlink_teardown(struct dsa_port *dp)
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{
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struct devlink_port *dlp = &dp->devlink_port;
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if (dp->devlink_port_setup)
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devlink_port_unregister(dlp);
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dp->devlink_port_setup = false;
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}
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static int dsa_devlink_info_get(struct devlink *dl,
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struct devlink_info_req *req,
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struct netlink_ext_ack *extack)
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{
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struct dsa_switch *ds = dsa_devlink_to_ds(dl);
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if (ds->ops->devlink_info_get)
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return ds->ops->devlink_info_get(ds, req, extack);
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return -EOPNOTSUPP;
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}
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static int dsa_devlink_sb_pool_get(struct devlink *dl,
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unsigned int sb_index, u16 pool_index,
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struct devlink_sb_pool_info *pool_info)
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{
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struct dsa_switch *ds = dsa_devlink_to_ds(dl);
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if (!ds->ops->devlink_sb_pool_get)
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return -EOPNOTSUPP;
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return ds->ops->devlink_sb_pool_get(ds, sb_index, pool_index,
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pool_info);
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}
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static int dsa_devlink_sb_pool_set(struct devlink *dl, unsigned int sb_index,
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u16 pool_index, u32 size,
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enum devlink_sb_threshold_type threshold_type,
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struct netlink_ext_ack *extack)
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{
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struct dsa_switch *ds = dsa_devlink_to_ds(dl);
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if (!ds->ops->devlink_sb_pool_set)
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return -EOPNOTSUPP;
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return ds->ops->devlink_sb_pool_set(ds, sb_index, pool_index, size,
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threshold_type, extack);
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}
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static int dsa_devlink_sb_port_pool_get(struct devlink_port *dlp,
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unsigned int sb_index, u16 pool_index,
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u32 *p_threshold)
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{
|
|
struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
|
|
int port = dsa_devlink_port_to_port(dlp);
|
|
|
|
if (!ds->ops->devlink_sb_port_pool_get)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_port_pool_get(ds, port, sb_index,
|
|
pool_index, p_threshold);
|
|
}
|
|
|
|
static int dsa_devlink_sb_port_pool_set(struct devlink_port *dlp,
|
|
unsigned int sb_index, u16 pool_index,
|
|
u32 threshold,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
|
|
int port = dsa_devlink_port_to_port(dlp);
|
|
|
|
if (!ds->ops->devlink_sb_port_pool_set)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_port_pool_set(ds, port, sb_index,
|
|
pool_index, threshold, extack);
|
|
}
|
|
|
|
static int
|
|
dsa_devlink_sb_tc_pool_bind_get(struct devlink_port *dlp,
|
|
unsigned int sb_index, u16 tc_index,
|
|
enum devlink_sb_pool_type pool_type,
|
|
u16 *p_pool_index, u32 *p_threshold)
|
|
{
|
|
struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
|
|
int port = dsa_devlink_port_to_port(dlp);
|
|
|
|
if (!ds->ops->devlink_sb_tc_pool_bind_get)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_tc_pool_bind_get(ds, port, sb_index,
|
|
tc_index, pool_type,
|
|
p_pool_index, p_threshold);
|
|
}
|
|
|
|
static int
|
|
dsa_devlink_sb_tc_pool_bind_set(struct devlink_port *dlp,
|
|
unsigned int sb_index, u16 tc_index,
|
|
enum devlink_sb_pool_type pool_type,
|
|
u16 pool_index, u32 threshold,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
|
|
int port = dsa_devlink_port_to_port(dlp);
|
|
|
|
if (!ds->ops->devlink_sb_tc_pool_bind_set)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_tc_pool_bind_set(ds, port, sb_index,
|
|
tc_index, pool_type,
|
|
pool_index, threshold,
|
|
extack);
|
|
}
|
|
|
|
static int dsa_devlink_sb_occ_snapshot(struct devlink *dl,
|
|
unsigned int sb_index)
|
|
{
|
|
struct dsa_switch *ds = dsa_devlink_to_ds(dl);
|
|
|
|
if (!ds->ops->devlink_sb_occ_snapshot)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_occ_snapshot(ds, sb_index);
|
|
}
|
|
|
|
static int dsa_devlink_sb_occ_max_clear(struct devlink *dl,
|
|
unsigned int sb_index)
|
|
{
|
|
struct dsa_switch *ds = dsa_devlink_to_ds(dl);
|
|
|
|
if (!ds->ops->devlink_sb_occ_max_clear)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_occ_max_clear(ds, sb_index);
|
|
}
|
|
|
|
static int dsa_devlink_sb_occ_port_pool_get(struct devlink_port *dlp,
|
|
unsigned int sb_index,
|
|
u16 pool_index, u32 *p_cur,
|
|
u32 *p_max)
|
|
{
|
|
struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
|
|
int port = dsa_devlink_port_to_port(dlp);
|
|
|
|
if (!ds->ops->devlink_sb_occ_port_pool_get)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_occ_port_pool_get(ds, port, sb_index,
|
|
pool_index, p_cur, p_max);
|
|
}
|
|
|
|
static int
|
|
dsa_devlink_sb_occ_tc_port_bind_get(struct devlink_port *dlp,
|
|
unsigned int sb_index, u16 tc_index,
|
|
enum devlink_sb_pool_type pool_type,
|
|
u32 *p_cur, u32 *p_max)
|
|
{
|
|
struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
|
|
int port = dsa_devlink_port_to_port(dlp);
|
|
|
|
if (!ds->ops->devlink_sb_occ_tc_port_bind_get)
|
|
return -EOPNOTSUPP;
|
|
|
|
return ds->ops->devlink_sb_occ_tc_port_bind_get(ds, port,
|
|
sb_index, tc_index,
|
|
pool_type, p_cur,
|
|
p_max);
|
|
}
|
|
|
|
static const struct devlink_ops dsa_devlink_ops = {
|
|
.info_get = dsa_devlink_info_get,
|
|
.sb_pool_get = dsa_devlink_sb_pool_get,
|
|
.sb_pool_set = dsa_devlink_sb_pool_set,
|
|
.sb_port_pool_get = dsa_devlink_sb_port_pool_get,
|
|
.sb_port_pool_set = dsa_devlink_sb_port_pool_set,
|
|
.sb_tc_pool_bind_get = dsa_devlink_sb_tc_pool_bind_get,
|
|
.sb_tc_pool_bind_set = dsa_devlink_sb_tc_pool_bind_set,
|
|
.sb_occ_snapshot = dsa_devlink_sb_occ_snapshot,
|
|
.sb_occ_max_clear = dsa_devlink_sb_occ_max_clear,
|
|
.sb_occ_port_pool_get = dsa_devlink_sb_occ_port_pool_get,
|
|
.sb_occ_tc_port_bind_get = dsa_devlink_sb_occ_tc_port_bind_get,
|
|
};
|
|
|
|
static int dsa_switch_setup(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_devlink_priv *dl_priv;
|
|
struct dsa_port *dp;
|
|
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;
|
|
|
|
/* Setup devlink port instances now, so that the switch
|
|
* setup() can register regions etc, against the ports
|
|
*/
|
|
list_for_each_entry(dp, &ds->dst->ports, list) {
|
|
if (dp->ds == ds) {
|
|
err = dsa_port_devlink_setup(dp);
|
|
if (err)
|
|
goto unregister_devlink_ports;
|
|
}
|
|
}
|
|
|
|
err = dsa_switch_register_notifier(ds);
|
|
if (err)
|
|
goto unregister_devlink_ports;
|
|
|
|
ds->configure_vlan_while_not_filtering = true;
|
|
|
|
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 teardown;
|
|
}
|
|
|
|
dsa_slave_mii_bus_init(ds);
|
|
|
|
err = mdiobus_register(ds->slave_mii_bus);
|
|
if (err < 0)
|
|
goto teardown;
|
|
}
|
|
|
|
ds->setup = true;
|
|
|
|
return 0;
|
|
|
|
teardown:
|
|
if (ds->ops->teardown)
|
|
ds->ops->teardown(ds);
|
|
unregister_notifier:
|
|
dsa_switch_unregister_notifier(ds);
|
|
unregister_devlink_ports:
|
|
list_for_each_entry(dp, &ds->dst->ports, list)
|
|
if (dp->ds == ds)
|
|
dsa_port_devlink_teardown(dp);
|
|
devlink_unregister(ds->devlink);
|
|
free_devlink:
|
|
devlink_free(ds->devlink);
|
|
ds->devlink = NULL;
|
|
|
|
return err;
|
|
}
|
|
|
|
static void dsa_switch_teardown(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_port *dp;
|
|
|
|
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) {
|
|
list_for_each_entry(dp, &ds->dst->ports, list)
|
|
if (dp->ds == ds)
|
|
dsa_port_devlink_teardown(dp);
|
|
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)
|
|
continue;
|
|
}
|
|
|
|
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_lags(struct dsa_switch_tree *dst)
|
|
{
|
|
unsigned int len = 0;
|
|
struct dsa_port *dp;
|
|
|
|
list_for_each_entry(dp, &dst->ports, list) {
|
|
if (dp->ds->num_lag_ids > len)
|
|
len = dp->ds->num_lag_ids;
|
|
}
|
|
|
|
if (!len)
|
|
return 0;
|
|
|
|
dst->lags = kcalloc(len, sizeof(*dst->lags), GFP_KERNEL);
|
|
if (!dst->lags)
|
|
return -ENOMEM;
|
|
|
|
dst->lags_len = len;
|
|
return 0;
|
|
}
|
|
|
|
static void dsa_tree_teardown_lags(struct dsa_switch_tree *dst)
|
|
{
|
|
kfree(dst->lags);
|
|
}
|
|
|
|
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;
|
|
|
|
err = dsa_tree_setup_lags(dst);
|
|
if (err)
|
|
goto teardown_master;
|
|
|
|
dst->setup = true;
|
|
|
|
pr_info("DSA: tree %d setup\n", dst->index);
|
|
|
|
return 0;
|
|
|
|
teardown_master:
|
|
dsa_tree_teardown_master(dst);
|
|
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_lags(dst);
|
|
|
|
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;
|
|
}
|
|
|
|
/* Since the dsa/tagging sysfs device attribute is per master, the assumption
|
|
* is that all DSA switches within a tree share the same tagger, otherwise
|
|
* they would have formed disjoint trees (different "dsa,member" values).
|
|
*/
|
|
int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
|
|
struct net_device *master,
|
|
const struct dsa_device_ops *tag_ops,
|
|
const struct dsa_device_ops *old_tag_ops)
|
|
{
|
|
struct dsa_notifier_tag_proto_info info;
|
|
struct dsa_port *dp;
|
|
int err = -EBUSY;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
/* At the moment we don't allow changing the tag protocol under
|
|
* traffic. The rtnl_mutex also happens to serialize concurrent
|
|
* attempts to change the tagging protocol. If we ever lift the IFF_UP
|
|
* restriction, there needs to be another mutex which serializes this.
|
|
*/
|
|
if (master->flags & IFF_UP)
|
|
goto out_unlock;
|
|
|
|
list_for_each_entry(dp, &dst->ports, list) {
|
|
if (!dsa_is_user_port(dp->ds, dp->index))
|
|
continue;
|
|
|
|
if (dp->slave->flags & IFF_UP)
|
|
goto out_unlock;
|
|
}
|
|
|
|
info.tag_ops = tag_ops;
|
|
err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info);
|
|
if (err)
|
|
goto out_unwind_tagger;
|
|
|
|
dst->tag_ops = tag_ops;
|
|
|
|
rtnl_unlock();
|
|
|
|
return 0;
|
|
|
|
out_unwind_tagger:
|
|
info.tag_ops = old_tag_ops;
|
|
dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info);
|
|
out_unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
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;
|
|
enum dsa_tag_protocol tag_protocol;
|
|
|
|
tag_protocol = dsa_get_tag_protocol(dp, master);
|
|
if (dst->tag_ops) {
|
|
if (dst->tag_ops->proto != tag_protocol) {
|
|
dev_err(ds->dev,
|
|
"A DSA switch tree can have only one tagging protocol\n");
|
|
return -EINVAL;
|
|
}
|
|
/* In the case of multiple CPU ports per switch, the tagging
|
|
* protocol is still reference-counted only per switch tree, so
|
|
* nothing to do here.
|
|
*/
|
|
} else {
|
|
dst->tag_ops = dsa_tag_driver_get(tag_protocol);
|
|
if (IS_ERR(dst->tag_ops)) {
|
|
if (PTR_ERR(dst->tag_ops) == -ENOPROTOOPT)
|
|
return -EPROBE_DEFER;
|
|
dev_warn(ds->dev, "No tagger for this switch\n");
|
|
dp->master = NULL;
|
|
return PTR_ERR(dst->tag_ops);
|
|
}
|
|
}
|
|
|
|
dp->master = master;
|
|
dp->type = DSA_PORT_TYPE_CPU;
|
|
dsa_port_set_tag_protocol(dp, dst->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) {
|
|
/* The second possibility is "ethernet-ports" */
|
|
ports = of_get_child_by_name(dn, "ethernet-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)
|
|
goto out_put_node;
|
|
|
|
if (reg >= ds->num_ports) {
|
|
dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%zu)\n",
|
|
port, 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 void dsa_switch_release_ports(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_switch_tree *dst = ds->dst;
|
|
struct dsa_port *dp, *next;
|
|
|
|
list_for_each_entry_safe(dp, next, &dst->ports, list) {
|
|
if (dp->ds != ds)
|
|
continue;
|
|
list_del(&dp->list);
|
|
kfree(dp);
|
|
}
|
|
}
|
|
|
|
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);
|
|
if (err)
|
|
dsa_switch_release_ports(ds);
|
|
} else if (pdata) {
|
|
err = dsa_switch_parse(ds, pdata);
|
|
if (err)
|
|
dsa_switch_release_ports(ds);
|
|
} else {
|
|
err = -ENODEV;
|
|
}
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
dst = ds->dst;
|
|
dsa_tree_get(dst);
|
|
err = dsa_tree_setup(dst);
|
|
if (err) {
|
|
dsa_switch_release_ports(ds);
|
|
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;
|
|
|
|
dsa_tree_teardown(dst);
|
|
dsa_switch_release_ports(ds);
|
|
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);
|