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// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
#include <linux/phy.h>
struct linkstate_req_info {
struct ethnl_req_info base;
};
struct linkstate_reply_data {
struct ethnl_reply_data base;
int link;
int sqi;
int sqi_max;
struct ethtool_link_ext_stats link_stats;
bool link_ext_state_provided;
struct ethtool_link_ext_state_info ethtool_link_ext_state_info;
};
#define LINKSTATE_REPDATA(__reply_base) \
container_of(__reply_base, struct linkstate_reply_data, base)
const struct nla_policy ethnl_linkstate_get_policy[] = {
[ETHTOOL_A_LINKSTATE_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy_stats),
};
static int linkstate_get_sqi(struct net_device *dev)
{
struct phy_device *phydev = dev->phydev;
int ret;
if (!phydev)
return -EOPNOTSUPP;
mutex_lock(&phydev->lock);
if (!phydev->drv || !phydev->drv->get_sqi)
ret = -EOPNOTSUPP;
else if (!phydev->link)
ret = -ENETDOWN;
else
ret = phydev->drv->get_sqi(phydev);
mutex_unlock(&phydev->lock);
return ret;
}
static int linkstate_get_sqi_max(struct net_device *dev)
{
struct phy_device *phydev = dev->phydev;
int ret;
if (!phydev)
return -EOPNOTSUPP;
mutex_lock(&phydev->lock);
if (!phydev->drv || !phydev->drv->get_sqi_max)
ret = -EOPNOTSUPP;
else if (!phydev->link)
ret = -ENETDOWN;
else
ret = phydev->drv->get_sqi_max(phydev);
mutex_unlock(&phydev->lock);
return ret;
};
static bool linkstate_sqi_critical_error(int sqi)
{
return sqi < 0 && sqi != -EOPNOTSUPP && sqi != -ENETDOWN;
}
static bool linkstate_sqi_valid(struct linkstate_reply_data *data)
{
return data->sqi >= 0 && data->sqi_max >= 0 &&
data->sqi <= data->sqi_max;
}
static int linkstate_get_link_ext_state(struct net_device *dev,
struct linkstate_reply_data *data)
{
int err;
if (!dev->ethtool_ops->get_link_ext_state)
return -EOPNOTSUPP;
err = dev->ethtool_ops->get_link_ext_state(dev, &data->ethtool_link_ext_state_info);
if (err)
return err;
data->link_ext_state_provided = true;
return 0;
}
static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
const struct genl_info *info)
{
struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
int ret;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
data->link = __ethtool_get_link(dev);
ret = linkstate_get_sqi(dev);
if (linkstate_sqi_critical_error(ret))
goto out;
data->sqi = ret;
ret = linkstate_get_sqi_max(dev);
if (linkstate_sqi_critical_error(ret))
goto out;
data->sqi_max = ret;
if (dev->flags & IFF_UP) {
ret = linkstate_get_link_ext_state(dev, data);
if (ret < 0 && ret != -EOPNOTSUPP && ret != -ENODATA)
goto out;
}
ethtool_stats_init((u64 *)&data->link_stats,
sizeof(data->link_stats) / 8);
if (req_base->flags & ETHTOOL_FLAG_STATS) {
if (dev->phydev)
data->link_stats.link_down_events =
READ_ONCE(dev->phydev->link_down_events);
if (dev->ethtool_ops->get_link_ext_stats)
dev->ethtool_ops->get_link_ext_stats(dev,
&data->link_stats);
}
ret = 0;
out:
ethnl_ops_complete(dev);
return ret;
}
static int linkstate_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
int len;
len = nla_total_size(sizeof(u8)) /* LINKSTATE_LINK */
+ 0;
if (linkstate_sqi_valid(data)) {
len += nla_total_size(sizeof(u32)); /* LINKSTATE_SQI */
len += nla_total_size(sizeof(u32)); /* LINKSTATE_SQI_MAX */
}
if (data->link_ext_state_provided)
len += nla_total_size(sizeof(u8)); /* LINKSTATE_EXT_STATE */
if (data->ethtool_link_ext_state_info.__link_ext_substate)
len += nla_total_size(sizeof(u8)); /* LINKSTATE_EXT_SUBSTATE */
if (data->link_stats.link_down_events != ETHTOOL_STAT_NOT_SET)
len += nla_total_size(sizeof(u32));
return len;
}
static int linkstate_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
if (data->link >= 0 &&
nla_put_u8(skb, ETHTOOL_A_LINKSTATE_LINK, !!data->link))
return -EMSGSIZE;
if (linkstate_sqi_valid(data)) {
if (nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI, data->sqi))
return -EMSGSIZE;
if (nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI_MAX,
data->sqi_max))
return -EMSGSIZE;
}
if (data->link_ext_state_provided) {
if (nla_put_u8(skb, ETHTOOL_A_LINKSTATE_EXT_STATE,
data->ethtool_link_ext_state_info.link_ext_state))
return -EMSGSIZE;
if (data->ethtool_link_ext_state_info.__link_ext_substate &&
nla_put_u8(skb, ETHTOOL_A_LINKSTATE_EXT_SUBSTATE,
data->ethtool_link_ext_state_info.__link_ext_substate))
return -EMSGSIZE;
}
if (data->link_stats.link_down_events != ETHTOOL_STAT_NOT_SET)
if (nla_put_u32(skb, ETHTOOL_A_LINKSTATE_EXT_DOWN_CNT,
data->link_stats.link_down_events))
return -EMSGSIZE;
return 0;
}
const struct ethnl_request_ops ethnl_linkstate_request_ops = {
.request_cmd = ETHTOOL_MSG_LINKSTATE_GET,
.reply_cmd = ETHTOOL_MSG_LINKSTATE_GET_REPLY,
.hdr_attr = ETHTOOL_A_LINKSTATE_HEADER,
.req_info_size = sizeof(struct linkstate_req_info),
.reply_data_size = sizeof(struct linkstate_reply_data),
.prepare_data = linkstate_prepare_data,
.reply_size = linkstate_reply_size,
.fill_reply = linkstate_fill_reply,
};
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