net/ethtool/linkstate.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "netlink.h"
   4 #include "common.h"
   5 #include <linux/phy.h>
   6
   7 struct linkstate_req_info {
   8         struct ethnl_req_info           base;
   9 };
  10
  11 struct linkstate_reply_data {
  12         struct ethnl_reply_data                 base;
  13         int                                     link;
  14         int                                     sqi;
  15         int                                     sqi_max;
  16         struct ethtool_link_ext_stats           link_stats;
  17         bool                                    link_ext_state_provided;
  18         struct ethtool_link_ext_state_info      ethtool_link_ext_state_info;
  19 };
  20
  21 #define LINKSTATE_REPDATA(__reply_base) \
  22         container_of(__reply_base, struct linkstate_reply_data, base)
  23
  24 const struct nla_policy ethnl_linkstate_get_policy[] = {
  25         [ETHTOOL_A_LINKSTATE_HEADER]            =
  26                 NLA_POLICY_NESTED(ethnl_header_policy_stats),
  27 };
  28
  29 static int linkstate_get_sqi(struct net_device *dev)
  30 {
  31         struct phy_device *phydev = dev->phydev;
  32         int ret;
  33
  34         if (!phydev)
  35                 return -EOPNOTSUPP;
  36
  37         mutex_lock(&phydev->lock);
  38         if (!phydev->drv || !phydev->drv->get_sqi)
  39                 ret = -EOPNOTSUPP;
  40         else
  41                 ret = phydev->drv->get_sqi(phydev);
  42         mutex_unlock(&phydev->lock);
  43
  44         return ret;
  45 }
  46
  47 static int linkstate_get_sqi_max(struct net_device *dev)
  48 {
  49         struct phy_device *phydev = dev->phydev;
  50         int ret;
  51
  52         if (!phydev)
  53                 return -EOPNOTSUPP;
  54
  55         mutex_lock(&phydev->lock);
  56         if (!phydev->drv || !phydev->drv->get_sqi_max)
  57                 ret = -EOPNOTSUPP;
  58         else
  59                 ret = phydev->drv->get_sqi_max(phydev);
  60         mutex_unlock(&phydev->lock);
  61
  62         return ret;
  63 };
  64
  65 static int linkstate_get_link_ext_state(struct net_device *dev,
  66                                         struct linkstate_reply_data *data)
  67 {
  68         int err;
  69
  70         if (!dev->ethtool_ops->get_link_ext_state)
  71                 return -EOPNOTSUPP;
  72
  73         err = dev->ethtool_ops->get_link_ext_state(dev, &data->ethtool_link_ext_state_info);
  74         if (err)
  75                 return err;
  76
  77         data->link_ext_state_provided = true;
  78
  79         return 0;
  80 }
  81
  82 static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
  83                                   struct ethnl_reply_data *reply_base,
  84                                   const struct genl_info *info)
  85 {
  86         struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
  87         struct net_device *dev = reply_base->dev;
  88         int ret;
  89
  90         ret = ethnl_ops_begin(dev);
  91         if (ret < 0)
  92                 return ret;
  93         data->link = __ethtool_get_link(dev);
  94
  95         ret = linkstate_get_sqi(dev);
  96         if (ret < 0 && ret != -EOPNOTSUPP)
  97                 goto out;
  98         data->sqi = ret;
  99
 100         ret = linkstate_get_sqi_max(dev);
 101         if (ret < 0 && ret != -EOPNOTSUPP)
 102                 goto out;
 103         data->sqi_max = ret;
 104
 105         if (dev->flags & IFF_UP) {
 106                 ret = linkstate_get_link_ext_state(dev, data);
 107                 if (ret < 0 && ret != -EOPNOTSUPP && ret != -ENODATA)
 108                         goto out;
 109         }
 110
 111         ethtool_stats_init((u64 *)&data->link_stats,
 112                            sizeof(data->link_stats) / 8);
 113
 114         if (req_base->flags & ETHTOOL_FLAG_STATS) {
 115                 if (dev->phydev)
 116                         data->link_stats.link_down_events =
 117                                 READ_ONCE(dev->phydev->link_down_events);
 118
 119                 if (dev->ethtool_ops->get_link_ext_stats)
 120                         dev->ethtool_ops->get_link_ext_stats(dev,
 121                                                              &data->link_stats);
 122         }
 123
 124         ret = 0;
 125 out:
 126         ethnl_ops_complete(dev);
 127         return ret;
 128 }
 129
 130 static int linkstate_reply_size(const struct ethnl_req_info *req_base,
 131                                 const struct ethnl_reply_data *reply_base)
 132 {
 133         struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
 134         int len;
 135
 136         len = nla_total_size(sizeof(u8)) /* LINKSTATE_LINK */
 137                 + 0;
 138
 139         if (data->sqi != -EOPNOTSUPP)
 140                 len += nla_total_size(sizeof(u32));
 141
 142         if (data->sqi_max != -EOPNOTSUPP)
 143                 len += nla_total_size(sizeof(u32));
 144
 145         if (data->link_ext_state_provided)
 146                 len += nla_total_size(sizeof(u8)); /* LINKSTATE_EXT_STATE */
 147
 148         if (data->ethtool_link_ext_state_info.__link_ext_substate)
 149                 len += nla_total_size(sizeof(u8)); /* LINKSTATE_EXT_SUBSTATE */
 150
 151         if (data->link_stats.link_down_events != ETHTOOL_STAT_NOT_SET)
 152                 len += nla_total_size(sizeof(u32));
 153
 154         return len;
 155 }
 156
 157 static int linkstate_fill_reply(struct sk_buff *skb,
 158                                 const struct ethnl_req_info *req_base,
 159                                 const struct ethnl_reply_data *reply_base)
 160 {
 161         struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
 162
 163         if (data->link >= 0 &&
 164             nla_put_u8(skb, ETHTOOL_A_LINKSTATE_LINK, !!data->link))
 165                 return -EMSGSIZE;
 166
 167         if (data->sqi != -EOPNOTSUPP &&
 168             nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI, data->sqi))
 169                 return -EMSGSIZE;
 170
 171         if (data->sqi_max != -EOPNOTSUPP &&
 172             nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI_MAX, data->sqi_max))
 173                 return -EMSGSIZE;
 174
 175         if (data->link_ext_state_provided) {
 176                 if (nla_put_u8(skb, ETHTOOL_A_LINKSTATE_EXT_STATE,
 177                                data->ethtool_link_ext_state_info.link_ext_state))
 178                         return -EMSGSIZE;
 179
 180                 if (data->ethtool_link_ext_state_info.__link_ext_substate &&
 181                     nla_put_u8(skb, ETHTOOL_A_LINKSTATE_EXT_SUBSTATE,
 182                                data->ethtool_link_ext_state_info.__link_ext_substate))
 183                         return -EMSGSIZE;
 184         }
 185
 186         if (data->link_stats.link_down_events != ETHTOOL_STAT_NOT_SET)
 187                 if (nla_put_u32(skb, ETHTOOL_A_LINKSTATE_EXT_DOWN_CNT,
 188                                 data->link_stats.link_down_events))
 189                         return -EMSGSIZE;
 190
 191         return 0;
 192 }
 193
 194 const struct ethnl_request_ops ethnl_linkstate_request_ops = {
 195         .request_cmd            = ETHTOOL_MSG_LINKSTATE_GET,
 196         .reply_cmd              = ETHTOOL_MSG_LINKSTATE_GET_REPLY,
 197         .hdr_attr               = ETHTOOL_A_LINKSTATE_HEADER,
 198         .req_info_size          = sizeof(struct linkstate_req_info),
 199         .reply_data_size        = sizeof(struct linkstate_reply_data),
 200
 201         .prepare_data           = linkstate_prepare_data,
 202         .reply_size             = linkstate_reply_size,
 203         .fill_reply             = linkstate_fill_reply,
 204 };