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