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authorOleksij Rempel2024-07-09 08:19:43 +0200
committerPaolo Abeni2024-07-11 11:19:07 +0200
commitc184cf94e73b04ff7048d045f5413899bc664788 (patch)
treed4c67bcd87891f2f96ea6e4b359bd21f2ff7233b /net
parentf2aeb7306a898e1cbd03963d376f4b6656ca2b55 (diff)
ethtool: netlink: do not return SQI value if link is down
Do not attach SQI value if link is down. "SQI values are only valid if link-up condition is present" per OpenAlliance specification of 100Base-T1 Interoperability Test suite [1]. The same rule would apply for other link types. [1] https://opensig.org/automotive-ethernet-specifications/# Fixes: 806602191592 ("ethtool: provide UAPI for PHY Signal Quality Index (SQI)") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Woojung Huh <woojung.huh@microchip.com> Link: https://patch.msgid.link/20240709061943.729381-1-o.rempel@pengutronix.de Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/ethtool/linkstate.c41
1 files changed, 28 insertions, 13 deletions
diff --git a/net/ethtool/linkstate.c b/net/ethtool/linkstate.c
index b2de2108b356..34d76e87847d 100644
--- a/net/ethtool/linkstate.c
+++ b/net/ethtool/linkstate.c
@@ -37,6 +37,8 @@ static int linkstate_get_sqi(struct net_device *dev)
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);
@@ -55,6 +57,8 @@ static int linkstate_get_sqi_max(struct net_device *dev)
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);
@@ -62,6 +66,17 @@ static int linkstate_get_sqi_max(struct net_device *dev)
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)
{
@@ -93,12 +108,12 @@ static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
data->link = __ethtool_get_link(dev);
ret = linkstate_get_sqi(dev);
- if (ret < 0 && ret != -EOPNOTSUPP)
+ if (linkstate_sqi_critical_error(ret))
goto out;
data->sqi = ret;
ret = linkstate_get_sqi_max(dev);
- if (ret < 0 && ret != -EOPNOTSUPP)
+ if (linkstate_sqi_critical_error(ret))
goto out;
data->sqi_max = ret;
@@ -136,11 +151,10 @@ static int linkstate_reply_size(const struct ethnl_req_info *req_base,
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));
+ 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 */
@@ -164,13 +178,14 @@ 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 (linkstate_sqi_valid(data)) {
+ if (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;
+ 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,