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 void ethtool_stats_init(u64 *stats, unsigned int n)
  25 {
  26         while (n--)
  27                 stats[n] = ETHTOOL_STAT_NOT_SET;
  28 }
  29
  30 static int pause_prepare_data(const struct ethnl_req_info *req_base,
  31                               struct ethnl_reply_data *reply_base,
  32                               struct genl_info *info)
  33 {
  34         struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
  35         struct net_device *dev = reply_base->dev;
  36         int ret;
  37
  38         if (!dev->ethtool_ops->get_pauseparam)
  39                 return -EOPNOTSUPP;
  40
  41         ethtool_stats_init((u64 *)&data->pausestat,
  42                            sizeof(data->pausestat) / 8);
  43
  44         ret = ethnl_ops_begin(dev);
  45         if (ret < 0)
  46                 return ret;
  47         dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
  48         if (req_base->flags & ETHTOOL_FLAG_STATS &&
  49             dev->ethtool_ops->get_pause_stats)
  50                 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
  51         ethnl_ops_complete(dev);
  52
  53         return 0;
  54 }
  55
  56 static int pause_reply_size(const struct ethnl_req_info *req_base,
  57                             const struct ethnl_reply_data *reply_base)
  58 {
  59         int n = nla_total_size(sizeof(u8)) +    /* _PAUSE_AUTONEG */
  60                 nla_total_size(sizeof(u8)) +    /* _PAUSE_RX */
  61                 nla_total_size(sizeof(u8));     /* _PAUSE_TX */
  62
  63         if (req_base->flags & ETHTOOL_FLAG_STATS)
  64                 n += nla_total_size(0) +        /* _PAUSE_STATS */
  65                      nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
  66         return n;
  67 }
  68
  69 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
  70                             u16 padtype)
  71 {
  72         if (val == ETHTOOL_STAT_NOT_SET)
  73                 return 0;
  74         if (nla_put_u64_64bit(skb, attrtype, val, padtype))
  75                 return -EMSGSIZE;
  76
  77         return 0;
  78 }
  79
  80 static int pause_put_stats(struct sk_buff *skb,
  81                            const struct ethtool_pause_stats *pause_stats)
  82 {
  83         const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
  84         struct nlattr *nest;
  85
  86         nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
  87         if (!nest)
  88                 return -EMSGSIZE;
  89
  90         if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
  91                              ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
  92             ethtool_put_stat(skb, pause_stats->rx_pause_frames,
  93                              ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
  94                 goto err_cancel;
  95
  96         nla_nest_end(skb, nest);
  97         return 0;
  98
  99 err_cancel:
 100         nla_nest_cancel(skb, nest);
 101         return -EMSGSIZE;
 102 }
 103
 104 static int pause_fill_reply(struct sk_buff *skb,
 105                             const struct ethnl_req_info *req_base,
 106                             const struct ethnl_reply_data *reply_base)
 107 {
 108         const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
 109         const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
 110
 111         if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
 112             nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
 113             nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
 114                 return -EMSGSIZE;
 115
 116         if (req_base->flags & ETHTOOL_FLAG_STATS &&
 117             pause_put_stats(skb, &data->pausestat))
 118                 return -EMSGSIZE;
 119
 120         return 0;
 121 }
 122
 123 const struct ethnl_request_ops ethnl_pause_request_ops = {
 124         .request_cmd            = ETHTOOL_MSG_PAUSE_GET,
 125         .reply_cmd              = ETHTOOL_MSG_PAUSE_GET_REPLY,
 126         .hdr_attr               = ETHTOOL_A_PAUSE_HEADER,
 127         .req_info_size          = sizeof(struct pause_req_info),
 128         .reply_data_size        = sizeof(struct pause_reply_data),
 129
 130         .prepare_data           = pause_prepare_data,
 131         .reply_size             = pause_reply_size,
 132         .fill_reply             = pause_fill_reply,
 133 };
 134
 135 /* PAUSE_SET */
 136
 137 const struct nla_policy ethnl_pause_set_policy[] = {
 138         [ETHTOOL_A_PAUSE_HEADER]                =
 139                 NLA_POLICY_NESTED(ethnl_header_policy),
 140         [ETHTOOL_A_PAUSE_AUTONEG]               = { .type = NLA_U8 },
 141         [ETHTOOL_A_PAUSE_RX]                    = { .type = NLA_U8 },
 142         [ETHTOOL_A_PAUSE_TX]                    = { .type = NLA_U8 },
 143 };
 144
 145 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
 146 {
 147         struct ethtool_pauseparam params = {};
 148         struct ethnl_req_info req_info = {};
 149         struct nlattr **tb = info->attrs;
 150         const struct ethtool_ops *ops;
 151         struct net_device *dev;
 152         bool mod = false;
 153         int ret;
 154
 155         ret = ethnl_parse_header_dev_get(&req_info,
 156                                          tb[ETHTOOL_A_PAUSE_HEADER],
 157                                          genl_info_net(info), info->extack,
 158                                          true);
 159         if (ret < 0)
 160                 return ret;
 161         dev = req_info.dev;
 162         ops = dev->ethtool_ops;
 163         ret = -EOPNOTSUPP;
 164         if (!ops->get_pauseparam || !ops->set_pauseparam)
 165                 goto out_dev;
 166
 167         rtnl_lock();
 168         ret = ethnl_ops_begin(dev);
 169         if (ret < 0)
 170                 goto out_rtnl;
 171         ops->get_pauseparam(dev, &params);
 172
 173         ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
 174         ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
 175         ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
 176         ret = 0;
 177         if (!mod)
 178                 goto out_ops;
 179
 180         ret = dev->ethtool_ops->set_pauseparam(dev, &params);
 181         if (ret < 0)
 182                 goto out_ops;
 183         ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
 184
 185 out_ops:
 186         ethnl_ops_complete(dev);
 187 out_rtnl:
 188         rtnl_unlock();
 189 out_dev:
 190         dev_put(dev);
 191         return ret;
 192 }