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