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         enum ethtool_mac_stats_src      src;
   9 };
  10
  11 #define PAUSE_REQINFO(__req_base) \
  12         container_of(__req_base, struct pause_req_info, base)
  13
  14 struct pause_reply_data {
  15         struct ethnl_reply_data         base;
  16         struct ethtool_pauseparam       pauseparam;
  17         struct ethtool_pause_stats      pausestat;
  18 };
  19
  20 #define PAUSE_REPDATA(__reply_base) \
  21         container_of(__reply_base, struct pause_reply_data, base)
  22
  23 const struct nla_policy ethnl_pause_get_policy[] = {
  24         [ETHTOOL_A_PAUSE_HEADER]                =
  25                 NLA_POLICY_NESTED(ethnl_header_policy_stats),
  26         [ETHTOOL_A_PAUSE_STATS_SRC]             =
  27                 NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC),
  28 };
  29
  30 static int pause_parse_request(struct ethnl_req_info *req_base,
  31                                struct nlattr **tb,
  32                                struct netlink_ext_ack *extack)
  33 {
  34         enum ethtool_mac_stats_src src = ETHTOOL_MAC_STATS_SRC_AGGREGATE;
  35         struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
  36
  37         if (tb[ETHTOOL_A_PAUSE_STATS_SRC]) {
  38                 if (!(req_base->flags & ETHTOOL_FLAG_STATS)) {
  39                         NL_SET_ERR_MSG_MOD(extack,
  40                                            "ETHTOOL_FLAG_STATS must be set when requesting a source of stats");
  41                         return -EINVAL;
  42                 }
  43
  44                 src = nla_get_u32(tb[ETHTOOL_A_PAUSE_STATS_SRC]);
  45         }
  46
  47         req_info->src = src;
  48
  49         return 0;
  50 }
  51
  52 static int pause_prepare_data(const struct ethnl_req_info *req_base,
  53                               struct ethnl_reply_data *reply_base,
  54                               const struct genl_info *info)
  55 {
  56         const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
  57         struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
  58         enum ethtool_mac_stats_src src = req_info->src;
  59         struct net_device *dev = reply_base->dev;
  60         int ret;
  61
  62         if (!dev->ethtool_ops->get_pauseparam)
  63                 return -EOPNOTSUPP;
  64
  65         ethtool_stats_init((u64 *)&data->pausestat,
  66                            sizeof(data->pausestat) / 8);
  67         data->pausestat.src = src;
  68
  69         ret = ethnl_ops_begin(dev);
  70         if (ret < 0)
  71                 return ret;
  72
  73         if ((src == ETHTOOL_MAC_STATS_SRC_EMAC ||
  74              src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
  75             !__ethtool_dev_mm_supported(dev)) {
  76                 NL_SET_ERR_MSG_MOD(info->extack,
  77                                    "Device does not support MAC merge layer");
  78                 ethnl_ops_complete(dev);
  79                 return -EOPNOTSUPP;
  80         }
  81
  82         dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
  83         if (req_base->flags & ETHTOOL_FLAG_STATS &&
  84             dev->ethtool_ops->get_pause_stats)
  85                 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
  86
  87         ethnl_ops_complete(dev);
  88
  89         return 0;
  90 }
  91
  92 static int pause_reply_size(const struct ethnl_req_info *req_base,
  93                             const struct ethnl_reply_data *reply_base)
  94 {
  95         int n = nla_total_size(sizeof(u8)) +    /* _PAUSE_AUTONEG */
  96                 nla_total_size(sizeof(u8)) +    /* _PAUSE_RX */
  97                 nla_total_size(sizeof(u8));     /* _PAUSE_TX */
  98
  99         if (req_base->flags & ETHTOOL_FLAG_STATS)
 100                 n += nla_total_size(0) +        /* _PAUSE_STATS */
 101                      nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */
 102                      nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
 103         return n;
 104 }
 105
 106 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
 107                             u16 padtype)
 108 {
 109         if (val == ETHTOOL_STAT_NOT_SET)
 110                 return 0;
 111         if (nla_put_u64_64bit(skb, attrtype, val, padtype))
 112                 return -EMSGSIZE;
 113
 114         return 0;
 115 }
 116
 117 static int pause_put_stats(struct sk_buff *skb,
 118                            const struct ethtool_pause_stats *pause_stats)
 119 {
 120         const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
 121         struct nlattr *nest;
 122
 123         if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src))
 124                 return -EMSGSIZE;
 125
 126         nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
 127         if (!nest)
 128                 return -EMSGSIZE;
 129
 130         if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
 131                              ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
 132             ethtool_put_stat(skb, pause_stats->rx_pause_frames,
 133                              ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
 134                 goto err_cancel;
 135
 136         nla_nest_end(skb, nest);
 137         return 0;
 138
 139 err_cancel:
 140         nla_nest_cancel(skb, nest);
 141         return -EMSGSIZE;
 142 }
 143
 144 static int pause_fill_reply(struct sk_buff *skb,
 145                             const struct ethnl_req_info *req_base,
 146                             const struct ethnl_reply_data *reply_base)
 147 {
 148         const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
 149         const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
 150
 151         if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
 152             nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
 153             nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
 154                 return -EMSGSIZE;
 155
 156         if (req_base->flags & ETHTOOL_FLAG_STATS &&
 157             pause_put_stats(skb, &data->pausestat))
 158                 return -EMSGSIZE;
 159
 160         return 0;
 161 }
 162
 163 /* PAUSE_SET */
 164
 165 const struct nla_policy ethnl_pause_set_policy[] = {
 166         [ETHTOOL_A_PAUSE_HEADER]                =
 167                 NLA_POLICY_NESTED(ethnl_header_policy),
 168         [ETHTOOL_A_PAUSE_AUTONEG]               = { .type = NLA_U8 },
 169         [ETHTOOL_A_PAUSE_RX]                    = { .type = NLA_U8 },
 170         [ETHTOOL_A_PAUSE_TX]                    = { .type = NLA_U8 },
 171 };
 172
 173 static int
 174 ethnl_set_pause_validate(struct ethnl_req_info *req_info,
 175                          struct genl_info *info)
 176 {
 177         const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
 178
 179         return ops->get_pauseparam && ops->set_pauseparam ? 1 : -EOPNOTSUPP;
 180 }
 181
 182 static int
 183 ethnl_set_pause(struct ethnl_req_info *req_info, struct genl_info *info)
 184 {
 185         struct net_device *dev = req_info->dev;
 186         struct ethtool_pauseparam params = {};
 187         struct nlattr **tb = info->attrs;
 188         bool mod = false;
 189         int ret;
 190
 191         dev->ethtool_ops->get_pauseparam(dev, &params);
 192
 193         ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
 194         ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
 195         ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
 196         if (!mod)
 197                 return 0;
 198
 199         ret = dev->ethtool_ops->set_pauseparam(dev, &params);
 200         return ret < 0 ? ret : 1;
 201 }
 202
 203 const struct ethnl_request_ops ethnl_pause_request_ops = {
 204         .request_cmd            = ETHTOOL_MSG_PAUSE_GET,
 205         .reply_cmd              = ETHTOOL_MSG_PAUSE_GET_REPLY,
 206         .hdr_attr               = ETHTOOL_A_PAUSE_HEADER,
 207         .req_info_size          = sizeof(struct pause_req_info),
 208         .reply_data_size        = sizeof(struct pause_reply_data),
 209
 210         .parse_request          = pause_parse_request,
 211         .prepare_data           = pause_prepare_data,
 212         .reply_size             = pause_reply_size,
 213         .fill_reply             = pause_fill_reply,
 214
 215         .set_validate           = ethnl_set_pause_validate,
 216         .set                    = ethnl_set_pause,
 217         .set_ntf_cmd            = ETHTOOL_MSG_PAUSE_NTF,
 218 };