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                               struct genl_info *info)
  55 {
  56         const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
  57         struct netlink_ext_ack *extack = info ? info->extack : NULL;
  58         struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
  59         enum ethtool_mac_stats_src src = req_info->src;
  60         struct net_device *dev = reply_base->dev;
  61         int ret;
  62
  63         if (!dev->ethtool_ops->get_pauseparam)
  64                 return -EOPNOTSUPP;
  65
  66         ethtool_stats_init((u64 *)&data->pausestat,
  67                            sizeof(data->pausestat) / 8);
  68         data->pausestat.src = src;
  69
  70         ret = ethnl_ops_begin(dev);
  71         if (ret < 0)
  72                 return ret;
  73
  74         if ((src == ETHTOOL_MAC_STATS_SRC_EMAC ||
  75              src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
  76             !__ethtool_dev_mm_supported(dev)) {
  77                 NL_SET_ERR_MSG_MOD(extack,
  78                                    "Device does not support MAC merge layer");
  79                 ethnl_ops_complete(dev);
  80                 return -EOPNOTSUPP;
  81         }
  82
  83         dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
  84         if (req_base->flags & ETHTOOL_FLAG_STATS &&
  85             dev->ethtool_ops->get_pause_stats)
  86                 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
  87
  88         ethnl_ops_complete(dev);
  89
  90         return 0;
  91 }
  92
  93 static int pause_reply_size(const struct ethnl_req_info *req_base,
  94                             const struct ethnl_reply_data *reply_base)
  95 {
  96         int n = nla_total_size(sizeof(u8)) +    /* _PAUSE_AUTONEG */
  97                 nla_total_size(sizeof(u8)) +    /* _PAUSE_RX */
  98                 nla_total_size(sizeof(u8));     /* _PAUSE_TX */
  99
 100         if (req_base->flags & ETHTOOL_FLAG_STATS)
 101                 n += nla_total_size(0) +        /* _PAUSE_STATS */
 102                      nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */
 103                      nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
 104         return n;
 105 }
 106
 107 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
 108                             u16 padtype)
 109 {
 110         if (val == ETHTOOL_STAT_NOT_SET)
 111                 return 0;
 112         if (nla_put_u64_64bit(skb, attrtype, val, padtype))
 113                 return -EMSGSIZE;
 114
 115         return 0;
 116 }
 117
 118 static int pause_put_stats(struct sk_buff *skb,
 119                            const struct ethtool_pause_stats *pause_stats)
 120 {
 121         const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
 122         struct nlattr *nest;
 123
 124         if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src))
 125                 return -EMSGSIZE;
 126
 127         nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
 128         if (!nest)
 129                 return -EMSGSIZE;
 130
 131         if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
 132                              ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
 133             ethtool_put_stat(skb, pause_stats->rx_pause_frames,
 134                              ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
 135                 goto err_cancel;
 136
 137         nla_nest_end(skb, nest);
 138         return 0;
 139
 140 err_cancel:
 141         nla_nest_cancel(skb, nest);
 142         return -EMSGSIZE;
 143 }
 144
 145 static int pause_fill_reply(struct sk_buff *skb,
 146                             const struct ethnl_req_info *req_base,
 147                             const struct ethnl_reply_data *reply_base)
 148 {
 149         const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
 150         const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
 151
 152         if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
 153             nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
 154             nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
 155                 return -EMSGSIZE;
 156
 157         if (req_base->flags & ETHTOOL_FLAG_STATS &&
 158             pause_put_stats(skb, &data->pausestat))
 159                 return -EMSGSIZE;
 160
 161         return 0;
 162 }
 163
 164 /* PAUSE_SET */
 165
 166 const struct nla_policy ethnl_pause_set_policy[] = {
 167         [ETHTOOL_A_PAUSE_HEADER]                =
 168                 NLA_POLICY_NESTED(ethnl_header_policy),
 169         [ETHTOOL_A_PAUSE_AUTONEG]               = { .type = NLA_U8 },
 170         [ETHTOOL_A_PAUSE_RX]                    = { .type = NLA_U8 },
 171         [ETHTOOL_A_PAUSE_TX]                    = { .type = NLA_U8 },
 172 };
 173
 174 static int
 175 ethnl_set_pause_validate(struct ethnl_req_info *req_info,
 176                          struct genl_info *info)
 177 {
 178         const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
 179
 180         return ops->get_pauseparam && ops->set_pauseparam ? 1 : -EOPNOTSUPP;
 181 }
 182
 183 static int
 184 ethnl_set_pause(struct ethnl_req_info *req_info, struct genl_info *info)
 185 {
 186         struct net_device *dev = req_info->dev;
 187         struct ethtool_pauseparam params = {};
 188         struct nlattr **tb = info->attrs;
 189         bool mod = false;
 190         int ret;
 191
 192         dev->ethtool_ops->get_pauseparam(dev, &params);
 193
 194         ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
 195         ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
 196         ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
 197         if (!mod)
 198                 return 0;
 199
 200         ret = dev->ethtool_ops->set_pauseparam(dev, &params);
 201         return ret < 0 ? ret : 1;
 202 }
 203
 204 const struct ethnl_request_ops ethnl_pause_request_ops = {
 205         .request_cmd            = ETHTOOL_MSG_PAUSE_GET,
 206         .reply_cmd              = ETHTOOL_MSG_PAUSE_GET_REPLY,
 207         .hdr_attr               = ETHTOOL_A_PAUSE_HEADER,
 208         .req_info_size          = sizeof(struct pause_req_info),
 209         .reply_data_size        = sizeof(struct pause_reply_data),
 210
 211         .parse_request          = pause_parse_request,
 212         .prepare_data           = pause_prepare_data,
 213         .reply_size             = pause_reply_size,
 214         .fill_reply             = pause_fill_reply,
 215
 216         .set_validate           = ethnl_set_pause_validate,
 217         .set                    = ethnl_set_pause,
 218         .set_ntf_cmd            = ETHTOOL_MSG_PAUSE_NTF,
 219 };