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// SPDX-License-Identifier: GPL-2.0+
/*
* Infrastructure to handle all PHY devices connected to a given netdev,
* either directly or indirectly attached.
*
* Copyright (c) 2023 Maxime Chevallier<maxime.chevallier@bootlin.com>
*/
#include <linux/phy_link_topology.h>
#include <linux/phy.h>
#include <linux/rtnetlink.h>
#include <linux/xarray.h>
static int netdev_alloc_phy_link_topology(struct net_device *dev)
{
struct phy_link_topology *topo;
topo = kzalloc(sizeof(*topo), GFP_KERNEL);
if (!topo)
return -ENOMEM;
xa_init_flags(&topo->phys, XA_FLAGS_ALLOC1);
topo->next_phy_index = 1;
dev->link_topo = topo;
return 0;
}
int phy_link_topo_add_phy(struct net_device *dev,
struct phy_device *phy,
enum phy_upstream upt, void *upstream)
{
struct phy_link_topology *topo = dev->link_topo;
struct phy_device_node *pdn;
int ret;
if (!topo) {
ret = netdev_alloc_phy_link_topology(dev);
if (ret)
return ret;
topo = dev->link_topo;
}
pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
if (!pdn)
return -ENOMEM;
pdn->phy = phy;
switch (upt) {
case PHY_UPSTREAM_MAC:
pdn->upstream.netdev = (struct net_device *)upstream;
if (phy_on_sfp(phy))
pdn->parent_sfp_bus = pdn->upstream.netdev->sfp_bus;
break;
case PHY_UPSTREAM_PHY:
pdn->upstream.phydev = (struct phy_device *)upstream;
if (phy_on_sfp(phy))
pdn->parent_sfp_bus = pdn->upstream.phydev->sfp_bus;
break;
default:
ret = -EINVAL;
goto err;
}
pdn->upstream_type = upt;
/* Attempt to re-use a previously allocated phy_index */
if (phy->phyindex)
ret = xa_insert(&topo->phys, phy->phyindex, pdn, GFP_KERNEL);
else
ret = xa_alloc_cyclic(&topo->phys, &phy->phyindex, pdn,
xa_limit_32b, &topo->next_phy_index,
GFP_KERNEL);
if (ret)
goto err;
return 0;
err:
kfree(pdn);
return ret;
}
EXPORT_SYMBOL_GPL(phy_link_topo_add_phy);
void phy_link_topo_del_phy(struct net_device *dev,
struct phy_device *phy)
{
struct phy_link_topology *topo = dev->link_topo;
struct phy_device_node *pdn;
if (!topo)
return;
pdn = xa_erase(&topo->phys, phy->phyindex);
/* We delete the PHY from the topology, however we don't re-set the
* phy->phyindex field. If the PHY isn't gone, we can re-assign it the
* same index next time it's added back to the topology
*/
kfree(pdn);
}
EXPORT_SYMBOL_GPL(phy_link_topo_del_phy);
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