net/ethtool/features.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "netlink.h"
   4 #include "common.h"
   5 #include "bitset.h"
   6
   7 struct features_req_info {
   8         struct ethnl_req_info   base;
   9 };
  10
  11 struct features_reply_data {
  12         struct ethnl_reply_data base;
  13         u32                     hw[ETHTOOL_DEV_FEATURE_WORDS];
  14         u32                     wanted[ETHTOOL_DEV_FEATURE_WORDS];
  15         u32                     active[ETHTOOL_DEV_FEATURE_WORDS];
  16         u32                     nochange[ETHTOOL_DEV_FEATURE_WORDS];
  17         u32                     all[ETHTOOL_DEV_FEATURE_WORDS];
  18 };
  19
  20 #define FEATURES_REPDATA(__reply_base) \
  21         container_of(__reply_base, struct features_reply_data, base)
  22
  23 static const struct nla_policy
  24 features_get_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
  25         [ETHTOOL_A_FEATURES_UNSPEC]     = { .type = NLA_REJECT },
  26         [ETHTOOL_A_FEATURES_HEADER]     = { .type = NLA_NESTED },
  27         [ETHTOOL_A_FEATURES_HW]         = { .type = NLA_REJECT },
  28         [ETHTOOL_A_FEATURES_WANTED]     = { .type = NLA_REJECT },
  29         [ETHTOOL_A_FEATURES_ACTIVE]     = { .type = NLA_REJECT },
  30         [ETHTOOL_A_FEATURES_NOCHANGE]   = { .type = NLA_REJECT },
  31 };
  32
  33 static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
  34 {
  35         unsigned int i;
  36
  37         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
  38                 dest[i] = src >> (32 * i);
  39 }
  40
  41 static int features_prepare_data(const struct ethnl_req_info *req_base,
  42                                  struct ethnl_reply_data *reply_base,
  43                                  struct genl_info *info)
  44 {
  45         struct features_reply_data *data = FEATURES_REPDATA(reply_base);
  46         struct net_device *dev = reply_base->dev;
  47         netdev_features_t all_features;
  48
  49         ethnl_features_to_bitmap32(data->hw, dev->hw_features);
  50         ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
  51         ethnl_features_to_bitmap32(data->active, dev->features);
  52         ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
  53         all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
  54         ethnl_features_to_bitmap32(data->all, all_features);
  55
  56         return 0;
  57 }
  58
  59 static int features_reply_size(const struct ethnl_req_info *req_base,
  60                                const struct ethnl_reply_data *reply_base)
  61 {
  62         const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
  63         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
  64         unsigned int len = 0;
  65         int ret;
  66
  67         ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
  68                                   netdev_features_strings, compact);
  69         if (ret < 0)
  70                 return ret;
  71         len += ret;
  72         ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
  73                                   netdev_features_strings, compact);
  74         if (ret < 0)
  75                 return ret;
  76         len += ret;
  77         ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
  78                                   netdev_features_strings, compact);
  79         if (ret < 0)
  80                 return ret;
  81         len += ret;
  82         ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
  83                                   netdev_features_strings, compact);
  84         if (ret < 0)
  85                 return ret;
  86         len += ret;
  87
  88         return len;
  89 }
  90
  91 static int features_fill_reply(struct sk_buff *skb,
  92                                const struct ethnl_req_info *req_base,
  93                                const struct ethnl_reply_data *reply_base)
  94 {
  95         const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
  96         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
  97         int ret;
  98
  99         ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
 100                                  data->all, NETDEV_FEATURE_COUNT,
 101                                  netdev_features_strings, compact);
 102         if (ret < 0)
 103                 return ret;
 104         ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
 105                                  NULL, NETDEV_FEATURE_COUNT,
 106                                  netdev_features_strings, compact);
 107         if (ret < 0)
 108                 return ret;
 109         ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
 110                                  NULL, NETDEV_FEATURE_COUNT,
 111                                  netdev_features_strings, compact);
 112         if (ret < 0)
 113                 return ret;
 114         return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
 115                                   data->nochange, NULL, NETDEV_FEATURE_COUNT,
 116                                   netdev_features_strings, compact);
 117 }
 118
 119 const struct ethnl_request_ops ethnl_features_request_ops = {
 120         .request_cmd            = ETHTOOL_MSG_FEATURES_GET,
 121         .reply_cmd              = ETHTOOL_MSG_FEATURES_GET_REPLY,
 122         .hdr_attr               = ETHTOOL_A_FEATURES_HEADER,
 123         .max_attr               = ETHTOOL_A_FEATURES_MAX,
 124         .req_info_size          = sizeof(struct features_req_info),
 125         .reply_data_size        = sizeof(struct features_reply_data),
 126         .request_policy         = features_get_policy,
 127
 128         .prepare_data           = features_prepare_data,
 129         .reply_size             = features_reply_size,
 130         .fill_reply             = features_fill_reply,
 131 };
 132
 133 /* FEATURES_SET */
 134
 135 static const struct nla_policy
 136 features_set_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
 137         [ETHTOOL_A_FEATURES_UNSPEC]     = { .type = NLA_REJECT },
 138         [ETHTOOL_A_FEATURES_HEADER]     = { .type = NLA_NESTED },
 139         [ETHTOOL_A_FEATURES_HW]         = { .type = NLA_REJECT },
 140         [ETHTOOL_A_FEATURES_WANTED]     = { .type = NLA_NESTED },
 141         [ETHTOOL_A_FEATURES_ACTIVE]     = { .type = NLA_REJECT },
 142         [ETHTOOL_A_FEATURES_NOCHANGE]   = { .type = NLA_REJECT },
 143 };
 144
 145 static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
 146 {
 147         const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
 148         unsigned int i;
 149
 150         bitmap_zero(dest, NETDEV_FEATURE_COUNT);
 151         for (i = 0; i < words; i++)
 152                 dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG));
 153 }
 154
 155 static netdev_features_t ethnl_bitmap_to_features(unsigned long *src)
 156 {
 157         const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE;
 158         const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
 159         netdev_features_t ret = 0;
 160         unsigned int i;
 161
 162         for (i = 0; i < words; i++)
 163                 ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG);
 164         ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT);
 165         return ret;
 166 }
 167
 168 static int features_send_reply(struct net_device *dev, struct genl_info *info,
 169                                const unsigned long *wanted,
 170                                const unsigned long *wanted_mask,
 171                                const unsigned long *active,
 172                                const unsigned long *active_mask, bool compact)
 173 {
 174         struct sk_buff *rskb;
 175         void *reply_payload;
 176         int reply_len = 0;
 177         int ret;
 178
 179         reply_len = ethnl_reply_header_size();
 180         ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT,
 181                                 netdev_features_strings, compact);
 182         if (ret < 0)
 183                 goto err;
 184         reply_len += ret;
 185         ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT,
 186                                 netdev_features_strings, compact);
 187         if (ret < 0)
 188                 goto err;
 189         reply_len += ret;
 190
 191         ret = -ENOMEM;
 192         rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY,
 193                                 ETHTOOL_A_FEATURES_HEADER, info,
 194                                 &reply_payload);
 195         if (!rskb)
 196                 goto err;
 197
 198         ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted,
 199                                wanted_mask, NETDEV_FEATURE_COUNT,
 200                                netdev_features_strings, compact);
 201         if (ret < 0)
 202                 goto nla_put_failure;
 203         ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active,
 204                                active_mask, NETDEV_FEATURE_COUNT,
 205                                netdev_features_strings, compact);
 206         if (ret < 0)
 207                 goto nla_put_failure;
 208
 209         genlmsg_end(rskb, reply_payload);
 210         ret = genlmsg_reply(rskb, info);
 211         return ret;
 212
 213 nla_put_failure:
 214         nlmsg_free(rskb);
 215         WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n",
 216                   reply_len);
 217 err:
 218         GENL_SET_ERR_MSG(info, "failed to send reply message");
 219         return ret;
 220 }
 221
 222 int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
 223 {
 224         DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT);
 225         DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT);
 226         DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT);
 227         DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT);
 228         DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
 229         DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
 230         struct nlattr *tb[ETHTOOL_A_FEATURES_MAX + 1];
 231         struct ethnl_req_info req_info = {};
 232         struct net_device *dev;
 233         bool mod;
 234         int ret;
 235
 236         ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
 237                           ETHTOOL_A_FEATURES_MAX, features_set_policy,
 238                           info->extack);
 239         if (ret < 0)
 240                 return ret;
 241         if (!tb[ETHTOOL_A_FEATURES_WANTED])
 242                 return -EINVAL;
 243         ret = ethnl_parse_header_dev_get(&req_info,
 244                                          tb[ETHTOOL_A_FEATURES_HEADER],
 245                                          genl_info_net(info), info->extack,
 246                                          true);
 247         if (ret < 0)
 248                 return ret;
 249         dev = req_info.dev;
 250
 251         rtnl_lock();
 252         ethnl_features_to_bitmap(old_active, dev->features);
 253         ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
 254                                  tb[ETHTOOL_A_FEATURES_WANTED],
 255                                  netdev_features_strings, info->extack);
 256         if (ret < 0)
 257                 goto out_rtnl;
 258         if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
 259                 GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
 260                 ret = -EINVAL;
 261                 goto out_rtnl;
 262         }
 263
 264         /* set req_wanted bits not in req_mask from old_active */
 265         bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
 266         bitmap_andnot(new_active, old_active, req_mask, NETDEV_FEATURE_COUNT);
 267         bitmap_or(req_wanted, new_active, req_wanted, NETDEV_FEATURE_COUNT);
 268         if (bitmap_equal(req_wanted, old_active, NETDEV_FEATURE_COUNT)) {
 269                 ret = 0;
 270                 goto out_rtnl;
 271         }
 272
 273         dev->wanted_features = ethnl_bitmap_to_features(req_wanted);
 274         __netdev_update_features(dev);
 275         ethnl_features_to_bitmap(new_active, dev->features);
 276         mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);
 277
 278         ret = 0;
 279         if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
 280                 bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS;
 281
 282                 bitmap_xor(wanted_diff_mask, req_wanted, new_active,
 283                            NETDEV_FEATURE_COUNT);
 284                 bitmap_xor(active_diff_mask, old_active, new_active,
 285                            NETDEV_FEATURE_COUNT);
 286                 bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask,
 287                            NETDEV_FEATURE_COUNT);
 288                 bitmap_and(req_wanted, req_wanted, wanted_diff_mask,
 289                            NETDEV_FEATURE_COUNT);
 290                 bitmap_and(new_active, new_active, active_diff_mask,
 291                            NETDEV_FEATURE_COUNT);
 292
 293                 ret = features_send_reply(dev, info, req_wanted,
 294                                           wanted_diff_mask, new_active,
 295                                           active_diff_mask, compact);
 296         }
 297         if (mod)
 298                 ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
 299
 300 out_rtnl:
 301         rtnl_unlock();
 302         dev_put(dev);
 303         return ret;
 304 }