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