net/ethtool/linkinfo.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "netlink.h"
   4 #include "common.h"
   5
   6 struct linkinfo_req_info {
   7         struct ethnl_req_info           base;
   8 };
   9
  10 struct linkinfo_reply_data {
  11         struct ethnl_reply_data         base;
  12         struct ethtool_link_ksettings   ksettings;
  13         struct ethtool_link_settings    *lsettings;
  14 };
  15
  16 #define LINKINFO_REPDATA(__reply_base) \
  17         container_of(__reply_base, struct linkinfo_reply_data, base)
  18
  19 const struct nla_policy ethnl_linkinfo_get_policy[] = {
  20         [ETHTOOL_A_LINKINFO_HEADER]             =
  21                 NLA_POLICY_NESTED(ethnl_header_policy),
  22 };
  23
  24 static int linkinfo_prepare_data(const struct ethnl_req_info *req_base,
  25                                  struct ethnl_reply_data *reply_base,
  26                                  struct genl_info *info)
  27 {
  28         struct linkinfo_reply_data *data = LINKINFO_REPDATA(reply_base);
  29         struct net_device *dev = reply_base->dev;
  30         int ret;
  31
  32         data->lsettings = &data->ksettings.base;
  33
  34         ret = ethnl_ops_begin(dev);
  35         if (ret < 0)
  36                 return ret;
  37         ret = __ethtool_get_link_ksettings(dev, &data->ksettings);
  38         if (ret < 0 && info)
  39                 GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
  40         ethnl_ops_complete(dev);
  41
  42         return ret;
  43 }
  44
  45 static int linkinfo_reply_size(const struct ethnl_req_info *req_base,
  46                                const struct ethnl_reply_data *reply_base)
  47 {
  48         return nla_total_size(sizeof(u8)) /* LINKINFO_PORT */
  49                 + nla_total_size(sizeof(u8)) /* LINKINFO_PHYADDR */
  50                 + nla_total_size(sizeof(u8)) /* LINKINFO_TP_MDIX */
  51                 + nla_total_size(sizeof(u8)) /* LINKINFO_TP_MDIX_CTRL */
  52                 + nla_total_size(sizeof(u8)) /* LINKINFO_TRANSCEIVER */
  53                 + 0;
  54 }
  55
  56 static int linkinfo_fill_reply(struct sk_buff *skb,
  57                                const struct ethnl_req_info *req_base,
  58                                const struct ethnl_reply_data *reply_base)
  59 {
  60         const struct linkinfo_reply_data *data = LINKINFO_REPDATA(reply_base);
  61
  62         if (nla_put_u8(skb, ETHTOOL_A_LINKINFO_PORT, data->lsettings->port) ||
  63             nla_put_u8(skb, ETHTOOL_A_LINKINFO_PHYADDR,
  64                        data->lsettings->phy_address) ||
  65             nla_put_u8(skb, ETHTOOL_A_LINKINFO_TP_MDIX,
  66                        data->lsettings->eth_tp_mdix) ||
  67             nla_put_u8(skb, ETHTOOL_A_LINKINFO_TP_MDIX_CTRL,
  68                        data->lsettings->eth_tp_mdix_ctrl) ||
  69             nla_put_u8(skb, ETHTOOL_A_LINKINFO_TRANSCEIVER,
  70                        data->lsettings->transceiver))
  71                 return -EMSGSIZE;
  72
  73         return 0;
  74 }
  75
  76 const struct ethnl_request_ops ethnl_linkinfo_request_ops = {
  77         .request_cmd            = ETHTOOL_MSG_LINKINFO_GET,
  78         .reply_cmd              = ETHTOOL_MSG_LINKINFO_GET_REPLY,
  79         .hdr_attr               = ETHTOOL_A_LINKINFO_HEADER,
  80         .req_info_size          = sizeof(struct linkinfo_req_info),
  81         .reply_data_size        = sizeof(struct linkinfo_reply_data),
  82
  83         .prepare_data           = linkinfo_prepare_data,
  84         .reply_size             = linkinfo_reply_size,
  85         .fill_reply             = linkinfo_fill_reply,
  86 };
  87
  88 /* LINKINFO_SET */
  89
  90 const struct nla_policy ethnl_linkinfo_set_policy[] = {
  91         [ETHTOOL_A_LINKINFO_HEADER]             =
  92                 NLA_POLICY_NESTED(ethnl_header_policy),
  93         [ETHTOOL_A_LINKINFO_PORT]               = { .type = NLA_U8 },
  94         [ETHTOOL_A_LINKINFO_PHYADDR]            = { .type = NLA_U8 },
  95         [ETHTOOL_A_LINKINFO_TP_MDIX_CTRL]       = { .type = NLA_U8 },
  96 };
  97
  98 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info)
  99 {
 100         struct ethtool_link_ksettings ksettings = {};
 101         struct ethtool_link_settings *lsettings;
 102         struct ethnl_req_info req_info = {};
 103         struct nlattr **tb = info->attrs;
 104         struct net_device *dev;
 105         bool mod = false;
 106         int ret;
 107
 108         ret = ethnl_parse_header_dev_get(&req_info,
 109                                          tb[ETHTOOL_A_LINKINFO_HEADER],
 110                                          genl_info_net(info), info->extack,
 111                                          true);
 112         if (ret < 0)
 113                 return ret;
 114         dev = req_info.dev;
 115         ret = -EOPNOTSUPP;
 116         if (!dev->ethtool_ops->get_link_ksettings ||
 117             !dev->ethtool_ops->set_link_ksettings)
 118                 goto out_dev;
 119
 120         rtnl_lock();
 121         ret = ethnl_ops_begin(dev);
 122         if (ret < 0)
 123                 goto out_rtnl;
 124
 125         ret = __ethtool_get_link_ksettings(dev, &ksettings);
 126         if (ret < 0) {
 127                 GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
 128                 goto out_ops;
 129         }
 130         lsettings = &ksettings.base;
 131
 132         ethnl_update_u8(&lsettings->port, tb[ETHTOOL_A_LINKINFO_PORT], &mod);
 133         ethnl_update_u8(&lsettings->phy_address, tb[ETHTOOL_A_LINKINFO_PHYADDR],
 134                         &mod);
 135         ethnl_update_u8(&lsettings->eth_tp_mdix_ctrl,
 136                         tb[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL], &mod);
 137         ret = 0;
 138         if (!mod)
 139                 goto out_ops;
 140
 141         ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
 142         if (ret < 0)
 143                 GENL_SET_ERR_MSG(info, "link settings update failed");
 144         else
 145                 ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL);
 146
 147 out_ops:
 148         ethnl_ops_complete(dev);
 149 out_rtnl:
 150         rtnl_unlock();
 151 out_dev:
 152         dev_put(dev);
 153         return ret;
 154 }