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