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ethtool: linkstate: add a statistic for PHY down events

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The previous attempt to augment carrier_down (see Link)
was not met with much enthusiasm so let's do the simple
thing of exposing what some devices already maintain.
Add a common ethtool statistic for link going down.
Currently users have to maintain per-driver mapping
to extract the right stat from the vendor-specific ethtool -S
stats. carrier_down does not fit the bill because it counts
a lot of software related false positives.

Add the statistic to the extended link state API to steer
vendors towards implementing all of it.

Implement for bnxt and all Linux-controlled PHYs. mlx5 and (possibly)
enic also have a counter for this but I leave the implementation
to their maintainers.

Link: https://lore.kernel.org/r/20220520004500.2250674-1-kuba@kernel.org
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20221104190125.684910-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski
2022-11-04 12:01:25 -07:00
committed by Paolo Abeni
parent 91c596cc8d
commit 9a0f830f80
7 changed files with 61 additions and 1 deletions
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24
net/ethtool/linkstate.c
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@@ -13,6 +13,7 @@ struct linkstate_reply_data {
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;
};
@@ -22,7 +23,7 @@ struct linkstate_reply_data {
const struct nla_policy ethnl_linkstate_get_policy[] = {
[ETHTOOL_A_LINKSTATE_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
NLA_POLICY_NESTED(ethnl_header_policy_stats),
};
static int linkstate_get_sqi(struct net_device *dev)
@@ -107,6 +108,19 @@ static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
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);
@@ -134,6 +148,9 @@ static int linkstate_reply_size(const struct ethnl_req_info *req_base,
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;
}
@@ -166,6 +183,11 @@ static int linkstate_fill_reply(struct sk_buff *skb,
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;
}