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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2023 Bootlin
*
*/
#include <linux/phy.h>
#include <linux/phy_link_topology.h>
#include <linux/sfp.h>
#include <net/netdev_lock.h>
#include "common.h"
#include "netlink.h"
struct phy_req_info {
struct ethnl_req_info base;
};
struct phy_reply_data {
struct ethnl_reply_data base;
u32 phyindex;
char *drvname;
char *name;
unsigned int upstream_type;
char *upstream_sfp_name;
unsigned int upstream_index;
char *downstream_sfp_name;
};
#define PHY_REPDATA(__reply_base) \
container_of(__reply_base, struct phy_reply_data, base)
const struct nla_policy ethnl_phy_get_policy[ETHTOOL_A_PHY_HEADER + 1] = {
[ETHTOOL_A_PHY_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
};
static int phy_reply_size(const struct ethnl_req_info *req_info,
const struct ethnl_reply_data *reply_data)
{
struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
size_t size = 0;
/* ETHTOOL_A_PHY_INDEX */
size += nla_total_size(sizeof(u32));
/* ETHTOOL_A_DRVNAME */
if (rep_data->drvname)
size += nla_total_size(strlen(rep_data->drvname) + 1);
/* ETHTOOL_A_NAME */
size += nla_total_size(strlen(rep_data->name) + 1);
/* ETHTOOL_A_PHY_UPSTREAM_TYPE */
size += nla_total_size(sizeof(u32));
/* ETHTOOL_A_PHY_UPSTREAM_SFP_NAME */
if (rep_data->upstream_sfp_name)
size += nla_total_size(strlen(rep_data->upstream_sfp_name) + 1);
/* ETHTOOL_A_PHY_UPSTREAM_INDEX */
if (rep_data->upstream_index)
size += nla_total_size(sizeof(u32));
/* ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME */
if (rep_data->downstream_sfp_name)
size += nla_total_size(strlen(rep_data->downstream_sfp_name) + 1);
return size;
}
static int phy_prepare_data(const struct ethnl_req_info *req_info,
struct ethnl_reply_data *reply_data,
const struct genl_info *info)
{
struct phy_link_topology *topo = reply_data->dev->link_topo;
struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
struct nlattr **tb = info->attrs;
struct phy_device_node *pdn;
struct phy_device *phydev;
int ret;
/* RTNL is held by the caller */
phydev = ethnl_req_get_phydev(req_info, tb, ETHTOOL_A_PHY_HEADER,
info->extack);
if (IS_ERR_OR_NULL(phydev))
return -EOPNOTSUPP;
pdn = xa_load(&topo->phys, phydev->phyindex);
if (!pdn)
return -EOPNOTSUPP;
rep_data->phyindex = phydev->phyindex;
rep_data->name = kstrdup(dev_name(&phydev->mdio.dev), GFP_KERNEL);
if (!rep_data->name)
return -ENOMEM;
if (phydev->drv) {
rep_data->drvname = kstrdup(phydev->drv->name, GFP_KERNEL);
if (!rep_data->drvname) {
ret = -ENOMEM;
goto err_free_name;
}
}
rep_data->upstream_type = pdn->upstream_type;
if (pdn->upstream_type == PHY_UPSTREAM_PHY) {
struct phy_device *upstream = pdn->upstream.phydev;
rep_data->upstream_index = upstream->phyindex;
}
if (pdn->parent_sfp_bus) {
rep_data->upstream_sfp_name = kstrdup(sfp_get_name(pdn->parent_sfp_bus),
GFP_KERNEL);
if (!rep_data->upstream_sfp_name) {
ret = -ENOMEM;
goto err_free_drvname;
}
}
if (phydev->sfp_bus) {
rep_data->downstream_sfp_name = kstrdup(sfp_get_name(phydev->sfp_bus),
GFP_KERNEL);
if (!rep_data->downstream_sfp_name) {
ret = -ENOMEM;
goto err_free_upstream_sfp;
}
}
return 0;
err_free_upstream_sfp:
kfree(rep_data->upstream_sfp_name);
err_free_drvname:
kfree(rep_data->drvname);
err_free_name:
kfree(rep_data->name);
return ret;
}
static int phy_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_info,
const struct ethnl_reply_data *reply_data)
{
struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
if (nla_put_u32(skb, ETHTOOL_A_PHY_INDEX, rep_data->phyindex) ||
nla_put_string(skb, ETHTOOL_A_PHY_NAME, rep_data->name) ||
nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_TYPE, rep_data->upstream_type))
return -EMSGSIZE;
if (rep_data->drvname &&
nla_put_string(skb, ETHTOOL_A_PHY_DRVNAME, rep_data->drvname))
return -EMSGSIZE;
if (rep_data->upstream_index &&
nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_INDEX,
rep_data->upstream_index))
return -EMSGSIZE;
if (rep_data->upstream_sfp_name &&
nla_put_string(skb, ETHTOOL_A_PHY_UPSTREAM_SFP_NAME,
rep_data->upstream_sfp_name))
return -EMSGSIZE;
if (rep_data->downstream_sfp_name &&
nla_put_string(skb, ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME,
rep_data->downstream_sfp_name))
return -EMSGSIZE;
return 0;
}
static void phy_cleanup_data(struct ethnl_reply_data *reply_data)
{
struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
kfree(rep_data->drvname);
kfree(rep_data->name);
kfree(rep_data->upstream_sfp_name);
kfree(rep_data->downstream_sfp_name);
}
const struct ethnl_request_ops ethnl_phy_request_ops = {
.request_cmd = ETHTOOL_MSG_PHY_GET,
.reply_cmd = ETHTOOL_MSG_PHY_GET_REPLY,
.hdr_attr = ETHTOOL_A_PHY_HEADER,
.req_info_size = sizeof(struct phy_req_info),
.reply_data_size = sizeof(struct phy_reply_data),
.prepare_data = phy_prepare_data,
.reply_size = phy_reply_size,
.fill_reply = phy_fill_reply,
.cleanup_data = phy_cleanup_data,
};
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