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![Vivien Didelot](/assets/img/avatar_default.png)
In the case of pdata, the dsa_cpu_parse function calls dev_put() before
making sure it isn't NULL. Fix this.
Fixes: 71e0bbde0d
("net: dsa: Add support for platform data")
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
841 lines
17 KiB
C
841 lines
17 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_switch_trees);
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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_get_dst(u32 tree)
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{
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struct dsa_switch_tree *dst;
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list_for_each_entry(dst, &dsa_switch_trees, list)
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if (dst->tree == tree) {
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kref_get(&dst->refcount);
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return dst;
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}
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return NULL;
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}
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static void dsa_free_dst(struct kref *ref)
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{
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struct dsa_switch_tree *dst = container_of(ref, struct dsa_switch_tree,
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refcount);
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list_del(&dst->list);
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kfree(dst);
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}
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static void dsa_put_dst(struct dsa_switch_tree *dst)
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{
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kref_put(&dst->refcount, dsa_free_dst);
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}
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static struct dsa_switch_tree *dsa_add_dst(u32 tree)
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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->tree = tree;
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INIT_LIST_HEAD(&dst->list);
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list_add_tail(&dsa_switch_trees, &dst->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_dst_add_ds(struct dsa_switch_tree *dst,
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struct dsa_switch *ds, u32 index)
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{
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kref_get(&dst->refcount);
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dst->ds[index] = ds;
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}
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static void dsa_dst_del_ds(struct dsa_switch_tree *dst,
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struct dsa_switch *ds, u32 index)
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{
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dst->ds[index] = NULL;
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kref_put(&dst->refcount, dsa_free_dst);
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}
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/* For platform data configurations, we need to have a valid name argument to
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* differentiate a disabled port from an enabled one
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*/
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static bool dsa_port_is_valid(struct dsa_port *port)
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{
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return !!(port->dn || port->name);
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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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if (port->name && !strcmp(port->name, "dsa"))
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return true;
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else
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return !!of_parse_phandle(port->dn, "link", 0);
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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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if (port->name && !strcmp(port->name, "cpu"))
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return true;
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else
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return !!of_parse_phandle(port->dn, "ethernet", 0);
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}
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static bool dsa_ds_find_port_dn(struct dsa_switch *ds,
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struct device_node *port)
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{
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u32 index;
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for (index = 0; index < ds->num_ports; index++)
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if (ds->ports[index].dn == port)
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return true;
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return false;
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}
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static struct dsa_switch *dsa_dst_find_port_dn(struct dsa_switch_tree *dst,
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struct device_node *port)
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{
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struct dsa_switch *ds;
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u32 index;
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for (index = 0; index < DSA_MAX_SWITCHES; index++) {
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ds = dst->ds[index];
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if (!ds)
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continue;
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if (dsa_ds_find_port_dn(ds, port))
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return ds;
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}
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return NULL;
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}
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static int dsa_port_complete(struct dsa_switch_tree *dst,
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struct dsa_switch *src_ds,
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struct dsa_port *port,
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u32 src_port)
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{
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struct device_node *link;
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int index;
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struct dsa_switch *dst_ds;
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for (index = 0;; index++) {
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link = of_parse_phandle(port->dn, "link", index);
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if (!link)
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break;
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dst_ds = dsa_dst_find_port_dn(dst, link);
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of_node_put(link);
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if (!dst_ds)
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return 1;
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src_ds->rtable[dst_ds->index] = src_port;
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}
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return 0;
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}
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/* A switch is complete if all the DSA ports phandles point to ports
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* known in the tree. A return value of 1 means the tree is not
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* complete. This is not an error condition. A value of 0 is
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* success.
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*/
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static int dsa_ds_complete(struct dsa_switch_tree *dst, struct dsa_switch *ds)
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{
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struct dsa_port *port;
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u32 index;
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int err;
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for (index = 0; index < ds->num_ports; index++) {
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port = &ds->ports[index];
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if (!dsa_port_is_valid(port))
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continue;
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if (!dsa_port_is_dsa(port))
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continue;
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err = dsa_port_complete(dst, ds, port, index);
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if (err != 0)
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return err;
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ds->dsa_port_mask |= BIT(index);
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}
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return 0;
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}
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/* A tree is complete if all the DSA ports phandles point to ports
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* known in the tree. A return value of 1 means the tree is not
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* complete. This is not an error condition. A value of 0 is
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* success.
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*/
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static int dsa_dst_complete(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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u32 index;
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int err;
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for (index = 0; index < DSA_MAX_SWITCHES; index++) {
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ds = dst->ds[index];
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if (!ds)
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continue;
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err = dsa_ds_complete(dst, ds);
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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 int dsa_dsa_port_apply(struct dsa_port *port)
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{
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struct dsa_switch *ds = port->ds;
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int err;
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err = dsa_cpu_dsa_setup(port);
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if (err) {
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dev_warn(ds->dev, "Failed to setup dsa port %d: %d\n",
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port->index, err);
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return err;
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}
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memset(&port->devlink_port, 0, sizeof(port->devlink_port));
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return devlink_port_register(ds->devlink, &port->devlink_port,
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port->index);
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}
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static void dsa_dsa_port_unapply(struct dsa_port *port)
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{
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devlink_port_unregister(&port->devlink_port);
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dsa_cpu_dsa_destroy(port);
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}
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static int dsa_cpu_port_apply(struct dsa_port *port)
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{
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struct dsa_switch *ds = port->ds;
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int err;
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err = dsa_cpu_dsa_setup(port);
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if (err) {
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dev_warn(ds->dev, "Failed to setup cpu port %d: %d\n",
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port->index, err);
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return err;
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}
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memset(&port->devlink_port, 0, sizeof(port->devlink_port));
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err = devlink_port_register(ds->devlink, &port->devlink_port,
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port->index);
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return err;
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}
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static void dsa_cpu_port_unapply(struct dsa_port *port)
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{
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devlink_port_unregister(&port->devlink_port);
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dsa_cpu_dsa_destroy(port);
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port->ds->cpu_port_mask &= ~BIT(port->index);
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}
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static int dsa_user_port_apply(struct dsa_port *port)
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{
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struct dsa_switch *ds = port->ds;
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const char *name = port->name;
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int err;
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if (port->dn)
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name = of_get_property(port->dn, "label", NULL);
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if (!name)
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name = "eth%d";
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err = dsa_slave_create(port, name);
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if (err) {
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dev_warn(ds->dev, "Failed to create slave %d: %d\n",
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port->index, err);
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port->netdev = NULL;
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return err;
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}
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memset(&port->devlink_port, 0, sizeof(port->devlink_port));
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err = devlink_port_register(ds->devlink, &port->devlink_port,
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port->index);
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if (err)
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return err;
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devlink_port_type_eth_set(&port->devlink_port, port->netdev);
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return 0;
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}
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static void dsa_user_port_unapply(struct dsa_port *port)
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{
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devlink_port_unregister(&port->devlink_port);
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if (port->netdev) {
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dsa_slave_destroy(port->netdev);
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port->netdev = NULL;
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port->ds->enabled_port_mask &= ~(1 << port->index);
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}
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}
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static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
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{
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struct dsa_port *port;
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u32 index;
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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 = ds->enabled_port_mask;
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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->ops->set_addr) {
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err = ds->ops->set_addr(ds, dst->cpu_dp->netdev->dev_addr);
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if (err < 0)
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return err;
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}
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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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for (index = 0; index < ds->num_ports; index++) {
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port = &ds->ports[index];
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if (!dsa_port_is_valid(port))
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continue;
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if (dsa_port_is_dsa(port)) {
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err = dsa_dsa_port_apply(port);
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if (err)
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return err;
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continue;
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}
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if (dsa_port_is_cpu(port)) {
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err = dsa_cpu_port_apply(port);
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if (err)
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return err;
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continue;
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}
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err = dsa_user_port_apply(port);
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if (err)
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continue;
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}
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return 0;
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}
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static void dsa_ds_unapply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
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{
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struct dsa_port *port;
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u32 index;
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for (index = 0; index < ds->num_ports; index++) {
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port = &ds->ports[index];
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if (!dsa_port_is_valid(port))
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continue;
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if (dsa_port_is_dsa(port)) {
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dsa_dsa_port_unapply(port);
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continue;
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}
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if (dsa_port_is_cpu(port)) {
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dsa_cpu_port_unapply(port);
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continue;
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}
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dsa_user_port_unapply(port);
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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_dst_apply(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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u32 index;
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int err;
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for (index = 0; index < DSA_MAX_SWITCHES; index++) {
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ds = dst->ds[index];
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if (!ds)
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continue;
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err = dsa_ds_apply(dst, ds);
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if (err)
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return err;
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}
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if (dst->cpu_dp) {
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err = dsa_cpu_port_ethtool_setup(dst->cpu_dp);
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if (err)
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return err;
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}
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/* If we use a tagging format that doesn't have an ethertype
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* field, make sure that all packets from this point on get
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* sent to the tag format's receive function.
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*/
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wmb();
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dst->cpu_dp->netdev->dsa_ptr = dst;
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dst->applied = true;
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return 0;
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}
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static void dsa_dst_unapply(struct dsa_switch_tree *dst)
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{
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struct dsa_switch *ds;
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u32 index;
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if (!dst->applied)
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return;
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dst->cpu_dp->netdev->dsa_ptr = NULL;
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/* If we used a tagging format that doesn't have an ethertype
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* field, make sure that all packets from this point get sent
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* without the tag and go through the regular receive path.
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*/
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wmb();
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for (index = 0; index < DSA_MAX_SWITCHES; index++) {
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ds = dst->ds[index];
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if (!ds)
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continue;
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dsa_ds_unapply(dst, ds);
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}
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if (dst->cpu_dp) {
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dsa_cpu_port_ethtool_restore(dst->cpu_dp);
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dst->cpu_dp = NULL;
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}
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pr_info("DSA: tree %d unapplied\n", dst->tree);
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dst->applied = false;
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}
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static int dsa_cpu_parse(struct dsa_port *port, u32 index,
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struct dsa_switch_tree *dst,
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struct dsa_switch *ds)
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{
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enum dsa_tag_protocol tag_protocol;
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struct net_device *ethernet_dev;
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struct device_node *ethernet;
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if (port->dn) {
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ethernet = of_parse_phandle(port->dn, "ethernet", 0);
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if (!ethernet)
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return -EINVAL;
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ethernet_dev = of_find_net_device_by_node(ethernet);
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if (!ethernet_dev)
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return -EPROBE_DEFER;
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} else {
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ethernet_dev = dsa_dev_to_net_device(ds->cd->netdev[index]);
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if (!ethernet_dev)
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return -EPROBE_DEFER;
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dev_put(ethernet_dev);
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}
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if (!dst->cpu_dp) {
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dst->cpu_dp = port;
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dst->cpu_dp->netdev = ethernet_dev;
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}
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/* Initialize cpu_port_mask now for drv->setup()
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* to have access to a correct value, just like what
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* net/dsa/dsa.c::dsa_switch_setup_one does.
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*/
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ds->cpu_port_mask |= BIT(index);
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tag_protocol = ds->ops->get_tag_protocol(ds);
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dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
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if (IS_ERR(dst->tag_ops)) {
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dev_warn(ds->dev, "No tagger for this switch\n");
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ds->cpu_port_mask &= ~BIT(index);
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return PTR_ERR(dst->tag_ops);
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}
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dst->rcv = dst->tag_ops->rcv;
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return 0;
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}
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static int dsa_ds_parse(struct dsa_switch_tree *dst, struct dsa_switch *ds)
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{
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struct dsa_port *port;
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u32 index;
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int err;
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for (index = 0; index < ds->num_ports; index++) {
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port = &ds->ports[index];
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if (!dsa_port_is_valid(port) ||
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dsa_port_is_dsa(port))
|
|
continue;
|
|
|
|
if (dsa_port_is_cpu(port)) {
|
|
err = dsa_cpu_parse(port, index, dst, ds);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
/* Initialize enabled_port_mask now for drv->setup()
|
|
* to have access to a correct value, just like what
|
|
* net/dsa/dsa.c::dsa_switch_setup_one does.
|
|
*/
|
|
ds->enabled_port_mask |= BIT(index);
|
|
}
|
|
|
|
}
|
|
|
|
pr_info("DSA: switch %d %d parsed\n", dst->tree, ds->index);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dsa_dst_parse(struct dsa_switch_tree *dst)
|
|
{
|
|
struct dsa_switch *ds;
|
|
struct dsa_port *dp;
|
|
u32 index;
|
|
int port;
|
|
int err;
|
|
|
|
for (index = 0; index < DSA_MAX_SWITCHES; index++) {
|
|
ds = dst->ds[index];
|
|
if (!ds)
|
|
continue;
|
|
|
|
err = dsa_ds_parse(dst, ds);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (!dst->cpu_dp) {
|
|
pr_warn("Tree has no master device\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Assign the default CPU port to all ports of the fabric */
|
|
for (index = 0; index < DSA_MAX_SWITCHES; index++) {
|
|
ds = dst->ds[index];
|
|
if (!ds)
|
|
continue;
|
|
|
|
for (port = 0; port < ds->num_ports; port++) {
|
|
dp = &ds->ports[port];
|
|
if (!dsa_port_is_valid(dp) ||
|
|
dsa_port_is_dsa(dp) ||
|
|
dsa_port_is_cpu(dp))
|
|
continue;
|
|
|
|
dp->cpu_dp = dst->cpu_dp;
|
|
}
|
|
}
|
|
|
|
pr_info("DSA: tree %d parsed\n", dst->tree);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dsa_parse_ports_dn(struct device_node *ports, struct dsa_switch *ds)
|
|
{
|
|
struct device_node *port;
|
|
int err;
|
|
u32 reg;
|
|
|
|
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;
|
|
|
|
ds->ports[reg].dn = port;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dsa_parse_ports(struct dsa_chip_data *cd, struct dsa_switch *ds)
|
|
{
|
|
bool valid_name_found = false;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < DSA_MAX_PORTS; i++) {
|
|
if (!cd->port_names[i])
|
|
continue;
|
|
|
|
ds->ports[i].name = cd->port_names[i];
|
|
valid_name_found = true;
|
|
}
|
|
|
|
if (!valid_name_found && i == DSA_MAX_PORTS)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dsa_parse_member_dn(struct device_node *np, u32 *tree, u32 *index)
|
|
{
|
|
int err;
|
|
|
|
*tree = *index = 0;
|
|
|
|
err = of_property_read_u32_index(np, "dsa,member", 0, tree);
|
|
if (err) {
|
|
/* Does not exist, but it is optional */
|
|
if (err == -EINVAL)
|
|
return 0;
|
|
return err;
|
|
}
|
|
|
|
err = of_property_read_u32_index(np, "dsa,member", 1, index);
|
|
if (err)
|
|
return err;
|
|
|
|
if (*index >= DSA_MAX_SWITCHES)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dsa_parse_member(struct dsa_chip_data *pd, u32 *tree, u32 *index)
|
|
{
|
|
if (!pd)
|
|
return -ENODEV;
|
|
|
|
/* We do not support complex trees with dsa_chip_data */
|
|
*tree = 0;
|
|
*index = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct device_node *dsa_get_ports(struct dsa_switch *ds,
|
|
struct device_node *np)
|
|
{
|
|
struct device_node *ports;
|
|
|
|
ports = of_get_child_by_name(np, "ports");
|
|
if (!ports) {
|
|
dev_err(ds->dev, "no ports child node found\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return ports;
|
|
}
|
|
|
|
static int _dsa_register_switch(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_chip_data *pdata = ds->dev->platform_data;
|
|
struct device_node *np = ds->dev->of_node;
|
|
struct dsa_switch_tree *dst;
|
|
struct device_node *ports;
|
|
u32 tree, index;
|
|
int i, err;
|
|
|
|
if (np) {
|
|
err = dsa_parse_member_dn(np, &tree, &index);
|
|
if (err)
|
|
return err;
|
|
|
|
ports = dsa_get_ports(ds, np);
|
|
if (IS_ERR(ports))
|
|
return PTR_ERR(ports);
|
|
|
|
err = dsa_parse_ports_dn(ports, ds);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
err = dsa_parse_member(pdata, &tree, &index);
|
|
if (err)
|
|
return err;
|
|
|
|
err = dsa_parse_ports(pdata, ds);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
dst = dsa_get_dst(tree);
|
|
if (!dst) {
|
|
dst = dsa_add_dst(tree);
|
|
if (!dst)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (dst->ds[index]) {
|
|
err = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
ds->dst = dst;
|
|
ds->index = index;
|
|
ds->cd = pdata;
|
|
|
|
/* Initialize the routing table */
|
|
for (i = 0; i < DSA_MAX_SWITCHES; ++i)
|
|
ds->rtable[i] = DSA_RTABLE_NONE;
|
|
|
|
dsa_dst_add_ds(dst, ds, index);
|
|
|
|
err = dsa_dst_complete(dst);
|
|
if (err < 0)
|
|
goto out_del_dst;
|
|
|
|
if (err == 1) {
|
|
/* Not all switches registered yet */
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (dst->applied) {
|
|
pr_info("DSA: Disjoint trees?\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = dsa_dst_parse(dst);
|
|
if (err) {
|
|
if (err == -EPROBE_DEFER) {
|
|
dsa_dst_del_ds(dst, ds, ds->index);
|
|
return err;
|
|
}
|
|
|
|
goto out_del_dst;
|
|
}
|
|
|
|
err = dsa_dst_apply(dst);
|
|
if (err) {
|
|
dsa_dst_unapply(dst);
|
|
goto out_del_dst;
|
|
}
|
|
|
|
dsa_put_dst(dst);
|
|
return 0;
|
|
|
|
out_del_dst:
|
|
dsa_dst_del_ds(dst, ds, ds->index);
|
|
out:
|
|
dsa_put_dst(dst);
|
|
|
|
return err;
|
|
}
|
|
|
|
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_register_switch(ds);
|
|
mutex_unlock(&dsa2_mutex);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_register_switch);
|
|
|
|
static void _dsa_unregister_switch(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_switch_tree *dst = ds->dst;
|
|
|
|
dsa_dst_unapply(dst);
|
|
|
|
dsa_dst_del_ds(dst, ds, ds->index);
|
|
}
|
|
|
|
void dsa_unregister_switch(struct dsa_switch *ds)
|
|
{
|
|
mutex_lock(&dsa2_mutex);
|
|
_dsa_unregister_switch(ds);
|
|
mutex_unlock(&dsa2_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_unregister_switch);
|