net/ethtool/mm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2022-2023 NXP
   4  */
   5 #include "common.h"
   6 #include "netlink.h"
   7
   8 struct mm_req_info {
   9         struct ethnl_req_info           base;
  10 };
  11
  12 struct mm_reply_data {
  13         struct ethnl_reply_data         base;
  14         struct ethtool_mm_state         state;
  15         struct ethtool_mm_stats         stats;
  16 };
  17
  18 #define MM_REPDATA(__reply_base) \
  19         container_of(__reply_base, struct mm_reply_data, base)
  20
  21 #define ETHTOOL_MM_STAT_CNT \
  22         (__ETHTOOL_A_MM_STAT_CNT - (ETHTOOL_A_MM_STAT_PAD + 1))
  23
  24 const struct nla_policy ethnl_mm_get_policy[ETHTOOL_A_MM_HEADER + 1] = {
  25         [ETHTOOL_A_MM_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_stats),
  26 };
  27
  28 static int mm_prepare_data(const struct ethnl_req_info *req_base,
  29                            struct ethnl_reply_data *reply_base,
  30                            const struct genl_info *info)
  31 {
  32         struct mm_reply_data *data = MM_REPDATA(reply_base);
  33         struct net_device *dev = reply_base->dev;
  34         const struct ethtool_ops *ops;
  35         int ret;
  36
  37         ops = dev->ethtool_ops;
  38
  39         if (!ops->get_mm)
  40                 return -EOPNOTSUPP;
  41
  42         ethtool_stats_init((u64 *)&data->stats,
  43                            sizeof(data->stats) / sizeof(u64));
  44
  45         ret = ethnl_ops_begin(dev);
  46         if (ret < 0)
  47                 return ret;
  48
  49         ret = ops->get_mm(dev, &data->state);
  50         if (ret)
  51                 goto out_complete;
  52
  53         if (ops->get_mm_stats && (req_base->flags & ETHTOOL_FLAG_STATS))
  54                 ops->get_mm_stats(dev, &data->stats);
  55
  56 out_complete:
  57         ethnl_ops_complete(dev);
  58
  59         return ret;
  60 }
  61
  62 static int mm_reply_size(const struct ethnl_req_info *req_base,
  63                          const struct ethnl_reply_data *reply_base)
  64 {
  65         int len = 0;
  66
  67         len += nla_total_size(sizeof(u8)); /* _MM_PMAC_ENABLED */
  68         len += nla_total_size(sizeof(u8)); /* _MM_TX_ENABLED */
  69         len += nla_total_size(sizeof(u8)); /* _MM_TX_ACTIVE */
  70         len += nla_total_size(sizeof(u8)); /* _MM_VERIFY_ENABLED */
  71         len += nla_total_size(sizeof(u8)); /* _MM_VERIFY_STATUS */
  72         len += nla_total_size(sizeof(u32)); /* _MM_VERIFY_TIME */
  73         len += nla_total_size(sizeof(u32)); /* _MM_MAX_VERIFY_TIME */
  74         len += nla_total_size(sizeof(u32)); /* _MM_TX_MIN_FRAG_SIZE */
  75         len += nla_total_size(sizeof(u32)); /* _MM_RX_MIN_FRAG_SIZE */
  76
  77         if (req_base->flags & ETHTOOL_FLAG_STATS)
  78                 len += nla_total_size(0) + /* _MM_STATS */
  79                        nla_total_size_64bit(sizeof(u64)) * ETHTOOL_MM_STAT_CNT;
  80
  81         return len;
  82 }
  83
  84 static int mm_put_stat(struct sk_buff *skb, u64 val, u16 attrtype)
  85 {
  86         if (val == ETHTOOL_STAT_NOT_SET)
  87                 return 0;
  88         if (nla_put_u64_64bit(skb, attrtype, val, ETHTOOL_A_MM_STAT_PAD))
  89                 return -EMSGSIZE;
  90         return 0;
  91 }
  92
  93 static int mm_put_stats(struct sk_buff *skb,
  94                         const struct ethtool_mm_stats *stats)
  95 {
  96         struct nlattr *nest;
  97
  98         nest = nla_nest_start(skb, ETHTOOL_A_MM_STATS);
  99         if (!nest)
 100                 return -EMSGSIZE;
 101
 102         if (mm_put_stat(skb, stats->MACMergeFrameAssErrorCount,
 103                         ETHTOOL_A_MM_STAT_REASSEMBLY_ERRORS) ||
 104             mm_put_stat(skb, stats->MACMergeFrameSmdErrorCount,
 105                         ETHTOOL_A_MM_STAT_SMD_ERRORS) ||
 106             mm_put_stat(skb, stats->MACMergeFrameAssOkCount,
 107                         ETHTOOL_A_MM_STAT_REASSEMBLY_OK) ||
 108             mm_put_stat(skb, stats->MACMergeFragCountRx,
 109                         ETHTOOL_A_MM_STAT_RX_FRAG_COUNT) ||
 110             mm_put_stat(skb, stats->MACMergeFragCountTx,
 111                         ETHTOOL_A_MM_STAT_TX_FRAG_COUNT) ||
 112             mm_put_stat(skb, stats->MACMergeHoldCount,
 113                         ETHTOOL_A_MM_STAT_HOLD_COUNT))
 114                 goto err_cancel;
 115
 116         nla_nest_end(skb, nest);
 117         return 0;
 118
 119 err_cancel:
 120         nla_nest_cancel(skb, nest);
 121         return -EMSGSIZE;
 122 }
 123
 124 static int mm_fill_reply(struct sk_buff *skb,
 125                          const struct ethnl_req_info *req_base,
 126                          const struct ethnl_reply_data *reply_base)
 127 {
 128         const struct mm_reply_data *data = MM_REPDATA(reply_base);
 129         const struct ethtool_mm_state *state = &data->state;
 130
 131         if (nla_put_u8(skb, ETHTOOL_A_MM_TX_ENABLED, state->tx_enabled) ||
 132             nla_put_u8(skb, ETHTOOL_A_MM_TX_ACTIVE, state->tx_active) ||
 133             nla_put_u8(skb, ETHTOOL_A_MM_PMAC_ENABLED, state->pmac_enabled) ||
 134             nla_put_u8(skb, ETHTOOL_A_MM_VERIFY_ENABLED, state->verify_enabled) ||
 135             nla_put_u8(skb, ETHTOOL_A_MM_VERIFY_STATUS, state->verify_status) ||
 136             nla_put_u32(skb, ETHTOOL_A_MM_VERIFY_TIME, state->verify_time) ||
 137             nla_put_u32(skb, ETHTOOL_A_MM_MAX_VERIFY_TIME, state->max_verify_time) ||
 138             nla_put_u32(skb, ETHTOOL_A_MM_TX_MIN_FRAG_SIZE, state->tx_min_frag_size) ||
 139             nla_put_u32(skb, ETHTOOL_A_MM_RX_MIN_FRAG_SIZE, state->rx_min_frag_size))
 140                 return -EMSGSIZE;
 141
 142         if (req_base->flags & ETHTOOL_FLAG_STATS &&
 143             mm_put_stats(skb, &data->stats))
 144                 return -EMSGSIZE;
 145
 146         return 0;
 147 }
 148
 149 const struct nla_policy ethnl_mm_set_policy[ETHTOOL_A_MM_MAX + 1] = {
 150         [ETHTOOL_A_MM_HEADER]           = NLA_POLICY_NESTED(ethnl_header_policy),
 151         [ETHTOOL_A_MM_VERIFY_ENABLED]   = NLA_POLICY_MAX(NLA_U8, 1),
 152         [ETHTOOL_A_MM_VERIFY_TIME]      = NLA_POLICY_RANGE(NLA_U32, 1, 128),
 153         [ETHTOOL_A_MM_TX_ENABLED]       = NLA_POLICY_MAX(NLA_U8, 1),
 154         [ETHTOOL_A_MM_PMAC_ENABLED]     = NLA_POLICY_MAX(NLA_U8, 1),
 155         [ETHTOOL_A_MM_TX_MIN_FRAG_SIZE] = NLA_POLICY_RANGE(NLA_U32, 60, 252),
 156 };
 157
 158 static void mm_state_to_cfg(const struct ethtool_mm_state *state,
 159                             struct ethtool_mm_cfg *cfg)
 160 {
 161         /* We could also compare state->verify_status against
 162          * ETHTOOL_MM_VERIFY_STATUS_DISABLED, but state->verify_enabled
 163          * is more like an administrative state which should be seen in
 164          * ETHTOOL_MSG_MM_GET replies. For example, a port with verification
 165          * disabled might be in the ETHTOOL_MM_VERIFY_STATUS_INITIAL
 166          * if it's down.
 167          */
 168         cfg->verify_enabled = state->verify_enabled;
 169         cfg->verify_time = state->verify_time;
 170         cfg->tx_enabled = state->tx_enabled;
 171         cfg->pmac_enabled = state->pmac_enabled;
 172         cfg->tx_min_frag_size = state->tx_min_frag_size;
 173 }
 174
 175 static int
 176 ethnl_set_mm_validate(struct ethnl_req_info *req_info, struct genl_info *info)
 177 {
 178         const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
 179
 180         return ops->get_mm && ops->set_mm ? 1 : -EOPNOTSUPP;
 181 }
 182
 183 static int ethnl_set_mm(struct ethnl_req_info *req_info, struct genl_info *info)
 184 {
 185         struct netlink_ext_ack *extack = info->extack;
 186         struct net_device *dev = req_info->dev;
 187         struct ethtool_mm_state state = {};
 188         struct nlattr **tb = info->attrs;
 189         struct ethtool_mm_cfg cfg = {};
 190         bool mod = false;
 191         int ret;
 192
 193         ret = dev->ethtool_ops->get_mm(dev, &state);
 194         if (ret)
 195                 return ret;
 196
 197         mm_state_to_cfg(&state, &cfg);
 198
 199         ethnl_update_bool(&cfg.verify_enabled, tb[ETHTOOL_A_MM_VERIFY_ENABLED],
 200                           &mod);
 201         ethnl_update_u32(&cfg.verify_time, tb[ETHTOOL_A_MM_VERIFY_TIME], &mod);
 202         ethnl_update_bool(&cfg.tx_enabled, tb[ETHTOOL_A_MM_TX_ENABLED], &mod);
 203         ethnl_update_bool(&cfg.pmac_enabled, tb[ETHTOOL_A_MM_PMAC_ENABLED],
 204                           &mod);
 205         ethnl_update_u32(&cfg.tx_min_frag_size,
 206                          tb[ETHTOOL_A_MM_TX_MIN_FRAG_SIZE], &mod);
 207
 208         if (!mod)
 209                 return 0;
 210
 211         if (cfg.verify_time > state.max_verify_time) {
 212                 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MM_VERIFY_TIME],
 213                                     "verifyTime exceeds device maximum");
 214                 return -ERANGE;
 215         }
 216
 217         if (cfg.verify_enabled && !cfg.tx_enabled) {
 218                 NL_SET_ERR_MSG(extack, "Verification requires TX enabled");
 219                 return -EINVAL;
 220         }
 221
 222         if (cfg.tx_enabled && !cfg.pmac_enabled) {
 223                 NL_SET_ERR_MSG(extack, "TX enabled requires pMAC enabled");
 224                 return -EINVAL;
 225         }
 226
 227         ret = dev->ethtool_ops->set_mm(dev, &cfg, extack);
 228         return ret < 0 ? ret : 1;
 229 }
 230
 231 const struct ethnl_request_ops ethnl_mm_request_ops = {
 232         .request_cmd            = ETHTOOL_MSG_MM_GET,
 233         .reply_cmd              = ETHTOOL_MSG_MM_GET_REPLY,
 234         .hdr_attr               = ETHTOOL_A_MM_HEADER,
 235         .req_info_size          = sizeof(struct mm_req_info),
 236         .reply_data_size        = sizeof(struct mm_reply_data),
 237
 238         .prepare_data           = mm_prepare_data,
 239         .reply_size             = mm_reply_size,
 240         .fill_reply             = mm_fill_reply,
 241
 242         .set_validate           = ethnl_set_mm_validate,
 243         .set                    = ethnl_set_mm,
 244         .set_ntf_cmd            = ETHTOOL_MSG_MM_NTF,
 245 };
 246
 247 /* Returns whether a given device supports the MAC merge layer
 248  * (has an eMAC and a pMAC). Must be called under rtnl_lock() and
 249  * ethnl_ops_begin().
 250  */
 251 bool __ethtool_dev_mm_supported(struct net_device *dev)
 252 {
 253         const struct ethtool_ops *ops = dev->ethtool_ops;
 254         struct ethtool_mm_state state = {};
 255         int ret = -EOPNOTSUPP;
 256
 257         if (ops && ops->get_mm)
 258                 ret = ops->get_mm(dev, &state);
 259
 260         return !ret;
 261 }
 262
 263 bool ethtool_dev_mm_supported(struct net_device *dev)
 264 {
 265         const struct ethtool_ops *ops = dev->ethtool_ops;
 266         bool supported;
 267         int ret;
 268
 269         ASSERT_RTNL();
 270
 271         if (!ops)
 272                 return false;
 273
 274         ret = ethnl_ops_begin(dev);
 275         if (ret < 0)
 276                 return false;
 277
 278         supported = __ethtool_dev_mm_supported(dev);
 279
 280         ethnl_ops_complete(dev);
 281
 282         return supported;
 283 }
 284 EXPORT_SYMBOL_GPL(ethtool_dev_mm_supported);