net/ethtool/pause.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "netlink.h"
   4 #include "common.h"
   5
   6 struct pause_req_info {
   7         struct ethnl_req_info           base;
   8 };
   9
  10 struct pause_reply_data {
  11         struct ethnl_reply_data         base;
  12         struct ethtool_pauseparam       pauseparam;
  13         struct ethtool_pause_stats      pausestat;
  14 };
  15
  16 #define PAUSE_REPDATA(__reply_base) \
  17         container_of(__reply_base, struct pause_reply_data, base)
  18
  19 const struct nla_policy ethnl_pause_get_policy[] = {
  20         [ETHTOOL_A_PAUSE_HEADER]                =
  21                 NLA_POLICY_NESTED(ethnl_header_policy_stats),
  22 };
  23
  24 static int pause_prepare_data(const struct ethnl_req_info *req_base,
  25                               struct ethnl_reply_data *reply_base,
  26                               struct genl_info *info)
  27 {
  28         struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
  29         struct net_device *dev = reply_base->dev;
  30         int ret;
  31
  32         if (!dev->ethtool_ops->get_pauseparam)
  33                 return -EOPNOTSUPP;
  34
  35         ethtool_stats_init((u64 *)&data->pausestat,
  36                            sizeof(data->pausestat) / 8);
  37
  38         ret = ethnl_ops_begin(dev);
  39         if (ret < 0)
  40                 return ret;
  41         dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
  42         if (req_base->flags & ETHTOOL_FLAG_STATS &&
  43             dev->ethtool_ops->get_pause_stats)
  44                 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
  45         ethnl_ops_complete(dev);
  46
  47         return 0;
  48 }
  49
  50 static int pause_reply_size(const struct ethnl_req_info *req_base,
  51                             const struct ethnl_reply_data *reply_base)
  52 {
  53         int n = nla_total_size(sizeof(u8)) +    /* _PAUSE_AUTONEG */
  54                 nla_total_size(sizeof(u8)) +    /* _PAUSE_RX */
  55                 nla_total_size(sizeof(u8));     /* _PAUSE_TX */
  56
  57         if (req_base->flags & ETHTOOL_FLAG_STATS)
  58                 n += nla_total_size(0) +        /* _PAUSE_STATS */
  59                      nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
  60         return n;
  61 }
  62
  63 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
  64                             u16 padtype)
  65 {
  66         if (val == ETHTOOL_STAT_NOT_SET)
  67                 return 0;
  68         if (nla_put_u64_64bit(skb, attrtype, val, padtype))
  69                 return -EMSGSIZE;
  70
  71         return 0;
  72 }
  73
  74 static int pause_put_stats(struct sk_buff *skb,
  75                            const struct ethtool_pause_stats *pause_stats)
  76 {
  77         const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
  78         struct nlattr *nest;
  79
  80         nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
  81         if (!nest)
  82                 return -EMSGSIZE;
  83
  84         if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
  85                              ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
  86             ethtool_put_stat(skb, pause_stats->rx_pause_frames,
  87                              ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
  88                 goto err_cancel;
  89
  90         nla_nest_end(skb, nest);
  91         return 0;
  92
  93 err_cancel:
  94         nla_nest_cancel(skb, nest);
  95         return -EMSGSIZE;
  96 }
  97
  98 static int pause_fill_reply(struct sk_buff *skb,
  99                             const struct ethnl_req_info *req_base,
 100                             const struct ethnl_reply_data *reply_base)
 101 {
 102         const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
 103         const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
 104
 105         if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
 106             nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
 107             nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
 108                 return -EMSGSIZE;
 109
 110         if (req_base->flags & ETHTOOL_FLAG_STATS &&
 111             pause_put_stats(skb, &data->pausestat))
 112                 return -EMSGSIZE;
 113
 114         return 0;
 115 }
 116
 117 const struct ethnl_request_ops ethnl_pause_request_ops = {
 118         .request_cmd            = ETHTOOL_MSG_PAUSE_GET,
 119         .reply_cmd              = ETHTOOL_MSG_PAUSE_GET_REPLY,
 120         .hdr_attr               = ETHTOOL_A_PAUSE_HEADER,
 121         .req_info_size          = sizeof(struct pause_req_info),
 122         .reply_data_size        = sizeof(struct pause_reply_data),
 123
 124         .prepare_data           = pause_prepare_data,
 125         .reply_size             = pause_reply_size,
 126         .fill_reply             = pause_fill_reply,
 127 };
 128
 129 /* PAUSE_SET */
 130
 131 const struct nla_policy ethnl_pause_set_policy[] = {
 132         [ETHTOOL_A_PAUSE_HEADER]                =
 133                 NLA_POLICY_NESTED(ethnl_header_policy),
 134         [ETHTOOL_A_PAUSE_AUTONEG]               = { .type = NLA_U8 },
 135         [ETHTOOL_A_PAUSE_RX]                    = { .type = NLA_U8 },
 136         [ETHTOOL_A_PAUSE_TX]                    = { .type = NLA_U8 },
 137 };
 138
 139 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
 140 {
 141         struct ethtool_pauseparam params = {};
 142         struct ethnl_req_info req_info = {};
 143         struct nlattr **tb = info->attrs;
 144         const struct ethtool_ops *ops;
 145         struct net_device *dev;
 146         bool mod = false;
 147         int ret;
 148
 149         ret = ethnl_parse_header_dev_get(&req_info,
 150                                          tb[ETHTOOL_A_PAUSE_HEADER],
 151                                          genl_info_net(info), info->extack,
 152                                          true);
 153         if (ret < 0)
 154                 return ret;
 155         dev = req_info.dev;
 156         ops = dev->ethtool_ops;
 157         ret = -EOPNOTSUPP;
 158         if (!ops->get_pauseparam || !ops->set_pauseparam)
 159                 goto out_dev;
 160
 161         rtnl_lock();
 162         ret = ethnl_ops_begin(dev);
 163         if (ret < 0)
 164                 goto out_rtnl;
 165         ops->get_pauseparam(dev, &params);
 166
 167         ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
 168         ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
 169         ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
 170         ret = 0;
 171         if (!mod)
 172                 goto out_ops;
 173
 174         ret = dev->ethtool_ops->set_pauseparam(dev, &params);
 175         if (ret < 0)
 176                 goto out_ops;
 177         ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
 178
 179 out_ops:
 180         ethnl_ops_complete(dev);
 181 out_rtnl:
 182         rtnl_unlock();
 183 out_dev:
 184         ethnl_parse_header_dev_put(&req_info);
 185         return ret;
 186 }