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ethtool: provide UAPI for PHY Signal Quality Index (SQI)

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Signal Quality Index is a mandatory value required by "OPEN Alliance
SIG" for the 100Base-T1 PHYs [1]. This indicator can be used for cable
integrity diagnostic and investigating other noise sources and
implement by at least two vendors: NXP[2] and TI[3].

[1] http://www.opensig.org/download/document/218/Advanced_PHY_features_for_automotive_Ethernet_V1.0.pdf
[2] https://www.nxp.com/docs/en/data-sheet/TJA1100.pdf
[3] https://www.ti.com/product/DP83TC811R-Q1

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleksij Rempel 2020-05-20 08:29:14 +02:00 committed by David S. Miller
parent b0301a5a28
commit 8066021915
4 changed files with 82 additions and 3 deletions
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6
Documentation/networking/ethtool-netlink.rst
View File

@ -454,10 +454,12 @@ Request contents:
Kernel response contents:
==================================== ====== ==========================
==================================== ====== ============================
``ETHTOOL_A_LINKSTATE_HEADER`` nested reply header
``ETHTOOL_A_LINKSTATE_LINK`` bool link state (up/down)
==================================== ====== ==========================
``ETHTOOL_A_LINKSTATE_SQI`` u32 Current Signal Quality Index
``ETHTOOL_A_LINKSTATE_SQI_MAX`` u32 Max support SQI value
==================================== ====== ============================
For most NIC drivers, the value of ``ETHTOOL_A_LINKSTATE_LINK`` returns
carrier flag provided by ``netif_carrier_ok()`` but there are drivers which

2
include/linux/phy.h
View File

@ -723,6 +723,8 @@ struct phy_driver {
struct ethtool_tunable *tuna,
const void *data);
int (*set_loopback)(struct phy_device *dev, bool enable);
int (*get_sqi)(struct phy_device *dev);
int (*get_sqi_max)(struct phy_device *dev);
};
#define to_phy_driver(d) container_of(to_mdio_common_driver(d), \
struct phy_driver, mdiodrv)

2
include/uapi/linux/ethtool_netlink.h
View File

@ -232,6 +232,8 @@ enum {
ETHTOOL_A_LINKSTATE_UNSPEC,
ETHTOOL_A_LINKSTATE_HEADER, /* nest - _A_HEADER_* */
ETHTOOL_A_LINKSTATE_LINK, /* u8 */
ETHTOOL_A_LINKSTATE_SQI, /* u32 */
ETHTOOL_A_LINKSTATE_SQI_MAX, /* u32 */
/* add new constants above here */
__ETHTOOL_A_LINKSTATE_CNT,

75
net/ethtool/linkstate.c
View File

@ -2,6 +2,7 @@
#include "netlink.h"
#include "common.h"
#include <linux/phy.h>
struct linkstate_req_info {
struct ethnl_req_info base;
@ -10,6 +11,8 @@ struct linkstate_req_info {
struct linkstate_reply_data {
struct ethnl_reply_data base;
int link;
int sqi;
int sqi_max;
};
#define LINKSTATE_REPDATA(__reply_base) \
@ -20,8 +23,46 @@ linkstate_get_policy[ETHTOOL_A_LINKSTATE_MAX + 1] = {
[ETHTOOL_A_LINKSTATE_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKSTATE_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_LINKSTATE_LINK] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKSTATE_SQI] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKSTATE_SQI_MAX] = { .type = NLA_REJECT },
};
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
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
ret = phydev->drv->get_sqi_max(phydev);
mutex_unlock(&phydev->lock);
return ret;
}
static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
@ -34,6 +75,19 @@ static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
if (ret < 0)
return ret;
data->link = __ethtool_get_link(dev);
ret = linkstate_get_sqi(dev);
if (ret < 0 && ret != -EOPNOTSUPP)
return ret;
data->sqi = ret;
ret = linkstate_get_sqi_max(dev);
if (ret < 0 && ret != -EOPNOTSUPP)
return ret;
data->sqi_max = ret;
ethnl_ops_complete(dev);
return 0;
@ -42,8 +96,19 @@ static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
static int linkstate_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
return nla_total_size(sizeof(u8)) /* LINKSTATE_LINK */
struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
int len;
len = nla_total_size(sizeof(u8)) /* LINKSTATE_LINK */
+ 0;
if (data->sqi != -EOPNOTSUPP)
len += nla_total_size(sizeof(u32));
if (data->sqi_max != -EOPNOTSUPP)
len += nla_total_size(sizeof(u32));
return len;
}
static int linkstate_fill_reply(struct sk_buff *skb,
@ -56,6 +121,14 @@ static int linkstate_fill_reply(struct sk_buff *skb,
nla_put_u8(skb, ETHTOOL_A_LINKSTATE_LINK, !!data->link))
return -EMSGSIZE;
if (data->sqi != -EOPNOTSUPP &&
nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI, data->sqi))
return -EMSGSIZE;
if (data->sqi_max != -EOPNOTSUPP &&
nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI_MAX, data->sqi_max))
return -EMSGSIZE;
return 0;
}