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         ret = ethnl_ops_begin(dev);
  42         if (ret < 0)
  43                 return ret;
  44         dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
  45         if (req_base->flags & ETHTOOL_FLAG_STATS &&
  46             dev->ethtool_ops->get_pause_stats) {
  47                 ethtool_stats_init((u64 *)&data->pausestat,
  48                                    sizeof(data->pausestat) / 8);
  49                 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
  50         }
  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)) *
  66                                 (ETHTOOL_A_PAUSE_STAT_MAX - 2);
  67         return n;
  68 }
  69
  70 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
  71                             u16 padtype)
  72 {
  73         if (val == ETHTOOL_STAT_NOT_SET)
  74                 return 0;
  75         if (nla_put_u64_64bit(skb, attrtype, val, padtype))
  76                 return -EMSGSIZE;
  77
  78         return 0;
  79 }
  80
  81 static int pause_put_stats(struct sk_buff *skb,
  82                            const struct ethtool_pause_stats *pause_stats)
  83 {
  84         const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
  85         struct nlattr *nest;
  86
  87         nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
  88         if (!nest)
  89                 return -EMSGSIZE;
  90
  91         if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
  92                              ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
  93             ethtool_put_stat(skb, pause_stats->rx_pause_frames,
  94                              ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
  95                 goto err_cancel;
  96
  97         nla_nest_end(skb, nest);
  98         return 0;
  99
 100 err_cancel:
 101         nla_nest_cancel(skb, nest);
 102         return -EMSGSIZE;
 103 }
 104
 105 static int pause_fill_reply(struct sk_buff *skb,
 106                             const struct ethnl_req_info *req_base,
 107                             const struct ethnl_reply_data *reply_base)
 108 {
 109         const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
 110         const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
 111
 112         if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
 113             nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
 114             nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
 115                 return -EMSGSIZE;
 116
 117         if (req_base->flags & ETHTOOL_FLAG_STATS &&
 118             pause_put_stats(skb, &data->pausestat))
 119                 return -EMSGSIZE;
 120
 121         return 0;
 122 }
 123
 124 const struct ethnl_request_ops ethnl_pause_request_ops = {
 125         .request_cmd            = ETHTOOL_MSG_PAUSE_GET,
 126         .reply_cmd              = ETHTOOL_MSG_PAUSE_GET_REPLY,
 127         .hdr_attr               = ETHTOOL_A_PAUSE_HEADER,
 128         .req_info_size          = sizeof(struct pause_req_info),
 129         .reply_data_size        = sizeof(struct pause_reply_data),
 130
 131         .prepare_data           = pause_prepare_data,
 132         .reply_size             = pause_reply_size,
 133         .fill_reply             = pause_fill_reply,
 134 };
 135
 136 /* PAUSE_SET */
 137
 138 const struct nla_policy ethnl_pause_set_policy[] = {
 139         [ETHTOOL_A_PAUSE_HEADER]                =
 140                 NLA_POLICY_NESTED(ethnl_header_policy),
 141         [ETHTOOL_A_PAUSE_AUTONEG]               = { .type = NLA_U8 },
 142         [ETHTOOL_A_PAUSE_RX]                    = { .type = NLA_U8 },
 143         [ETHTOOL_A_PAUSE_TX]                    = { .type = NLA_U8 },
 144 };
 145
 146 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
 147 {
 148         struct ethtool_pauseparam params = {};
 149         struct ethnl_req_info req_info = {};
 150         struct nlattr **tb = info->attrs;
 151         const struct ethtool_ops *ops;
 152         struct net_device *dev;
 153         bool mod = false;
 154         int ret;
 155
 156         ret = ethnl_parse_header_dev_get(&req_info,
 157                                          tb[ETHTOOL_A_PAUSE_HEADER],
 158                                          genl_info_net(info), info->extack,
 159                                          true);
 160         if (ret < 0)
 161                 return ret;
 162         dev = req_info.dev;
 163         ops = dev->ethtool_ops;
 164         ret = -EOPNOTSUPP;
 165         if (!ops->get_pauseparam || !ops->set_pauseparam)
 166                 goto out_dev;
 167
 168         rtnl_lock();
 169         ret = ethnl_ops_begin(dev);
 170         if (ret < 0)
 171                 goto out_rtnl;
 172         ops->get_pauseparam(dev, &params);
 173
 174         ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
 175         ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
 176         ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
 177         ret = 0;
 178         if (!mod)
 179                 goto out_ops;
 180
 181         ret = dev->ethtool_ops->set_pauseparam(dev, &params);
 182         if (ret < 0)
 183                 goto out_ops;
 184         ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
 185
 186 out_ops:
 187         ethnl_ops_complete(dev);
 188 out_rtnl:
 189         rtnl_unlock();
 190 out_dev:
 191         dev_put(dev);
 192         return ret;
 193 }