1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "netlink.h" 4 #include "common.h" 5 6 struct rss_req_info { 7 struct ethnl_req_info base; 8 u32 rss_context; 9 }; 10 11 struct rss_reply_data { 12 struct ethnl_reply_data base; 13 bool no_key_fields; 14 u32 indir_size; 15 u32 hkey_size; 16 u32 hfunc; 17 u32 input_xfrm; 18 u32 *indir_table; 19 u8 *hkey; 20 }; 21 22 #define RSS_REQINFO(__req_base) \ 23 container_of(__req_base, struct rss_req_info, base) 24 25 #define RSS_REPDATA(__reply_base) \ 26 container_of(__reply_base, struct rss_reply_data, base) 27 28 const struct nla_policy ethnl_rss_get_policy[] = { 29 [ETHTOOL_A_RSS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy), 30 [ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32 }, 31 [ETHTOOL_A_RSS_START_CONTEXT] = { .type = NLA_U32 }, 32 }; 33 34 static int 35 rss_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb, 36 struct netlink_ext_ack *extack) 37 { 38 struct rss_req_info *request = RSS_REQINFO(req_info); 39 40 if (tb[ETHTOOL_A_RSS_CONTEXT]) 41 request->rss_context = nla_get_u32(tb[ETHTOOL_A_RSS_CONTEXT]); 42 if (tb[ETHTOOL_A_RSS_START_CONTEXT]) { 43 NL_SET_BAD_ATTR(extack, tb[ETHTOOL_A_RSS_START_CONTEXT]); 44 return -EINVAL; 45 } 46 47 return 0; 48 } 49 50 static int 51 rss_prepare_get(const struct rss_req_info *request, struct net_device *dev, 52 struct rss_reply_data *data, const struct genl_info *info) 53 { 54 struct ethtool_rxfh_param rxfh = {}; 55 const struct ethtool_ops *ops; 56 u32 total_size, indir_bytes; 57 u8 *rss_config; 58 int ret; 59 60 ops = dev->ethtool_ops; 61 62 ret = ethnl_ops_begin(dev); 63 if (ret < 0) 64 return ret; 65 66 data->indir_size = 0; 67 data->hkey_size = 0; 68 if (ops->get_rxfh_indir_size) 69 data->indir_size = ops->get_rxfh_indir_size(dev); 70 if (ops->get_rxfh_key_size) 71 data->hkey_size = ops->get_rxfh_key_size(dev); 72 73 indir_bytes = data->indir_size * sizeof(u32); 74 total_size = indir_bytes + data->hkey_size; 75 rss_config = kzalloc(total_size, GFP_KERNEL); 76 if (!rss_config) { 77 ret = -ENOMEM; 78 goto out_ops; 79 } 80 81 if (data->indir_size) 82 data->indir_table = (u32 *)rss_config; 83 if (data->hkey_size) 84 data->hkey = rss_config + indir_bytes; 85 86 rxfh.indir_size = data->indir_size; 87 rxfh.indir = data->indir_table; 88 rxfh.key_size = data->hkey_size; 89 rxfh.key = data->hkey; 90 91 ret = ops->get_rxfh(dev, &rxfh); 92 if (ret) 93 goto out_ops; 94 95 data->hfunc = rxfh.hfunc; 96 data->input_xfrm = rxfh.input_xfrm; 97 out_ops: 98 ethnl_ops_complete(dev); 99 return ret; 100 } 101 102 static int 103 rss_prepare_ctx(const struct rss_req_info *request, struct net_device *dev, 104 struct rss_reply_data *data, const struct genl_info *info) 105 { 106 struct ethtool_rxfh_context *ctx; 107 u32 total_size, indir_bytes; 108 u8 *rss_config; 109 110 ctx = xa_load(&dev->ethtool->rss_ctx, request->rss_context); 111 if (!ctx) 112 return -ENOENT; 113 114 data->indir_size = ctx->indir_size; 115 data->hkey_size = ctx->key_size; 116 data->hfunc = ctx->hfunc; 117 data->input_xfrm = ctx->input_xfrm; 118 119 indir_bytes = data->indir_size * sizeof(u32); 120 total_size = indir_bytes + data->hkey_size; 121 rss_config = kzalloc(total_size, GFP_KERNEL); 122 if (!rss_config) 123 return -ENOMEM; 124 125 data->indir_table = (u32 *)rss_config; 126 memcpy(data->indir_table, ethtool_rxfh_context_indir(ctx), indir_bytes); 127 128 if (data->hkey_size) { 129 data->hkey = rss_config + indir_bytes; 130 memcpy(data->hkey, ethtool_rxfh_context_key(ctx), 131 data->hkey_size); 132 } 133 134 return 0; 135 } 136 137 static int 138 rss_prepare_data(const struct ethnl_req_info *req_base, 139 struct ethnl_reply_data *reply_base, 140 const struct genl_info *info) 141 { 142 struct rss_reply_data *data = RSS_REPDATA(reply_base); 143 struct rss_req_info *request = RSS_REQINFO(req_base); 144 struct net_device *dev = reply_base->dev; 145 const struct ethtool_ops *ops; 146 147 ops = dev->ethtool_ops; 148 if (!ops->get_rxfh) 149 return -EOPNOTSUPP; 150 151 /* Some drivers don't handle rss_context */ 152 if (request->rss_context) { 153 if (!ops->cap_rss_ctx_supported && !ops->create_rxfh_context) 154 return -EOPNOTSUPP; 155 156 data->no_key_fields = !ops->rxfh_per_ctx_key; 157 return rss_prepare_ctx(request, dev, data, info); 158 } 159 160 return rss_prepare_get(request, dev, data, info); 161 } 162 163 static int 164 rss_reply_size(const struct ethnl_req_info *req_base, 165 const struct ethnl_reply_data *reply_base) 166 { 167 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 168 int len; 169 170 len = nla_total_size(sizeof(u32)) + /* _RSS_CONTEXT */ 171 nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */ 172 nla_total_size(sizeof(u32)) + /* _RSS_INPUT_XFRM */ 173 nla_total_size(sizeof(u32) * data->indir_size) + /* _RSS_INDIR */ 174 nla_total_size(data->hkey_size); /* _RSS_HKEY */ 175 176 return len; 177 } 178 179 static int 180 rss_fill_reply(struct sk_buff *skb, const struct ethnl_req_info *req_base, 181 const struct ethnl_reply_data *reply_base) 182 { 183 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 184 struct rss_req_info *request = RSS_REQINFO(req_base); 185 186 if (request->rss_context && 187 nla_put_u32(skb, ETHTOOL_A_RSS_CONTEXT, request->rss_context)) 188 return -EMSGSIZE; 189 190 if ((data->indir_size && 191 nla_put(skb, ETHTOOL_A_RSS_INDIR, 192 sizeof(u32) * data->indir_size, data->indir_table))) 193 return -EMSGSIZE; 194 195 if (data->no_key_fields) 196 return 0; 197 198 if ((data->hfunc && 199 nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc)) || 200 (data->input_xfrm && 201 nla_put_u32(skb, ETHTOOL_A_RSS_INPUT_XFRM, data->input_xfrm)) || 202 (data->hkey_size && 203 nla_put(skb, ETHTOOL_A_RSS_HKEY, data->hkey_size, data->hkey))) 204 return -EMSGSIZE; 205 206 return 0; 207 } 208 209 static void rss_cleanup_data(struct ethnl_reply_data *reply_base) 210 { 211 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 212 213 kfree(data->indir_table); 214 } 215 216 struct rss_nl_dump_ctx { 217 unsigned long ifindex; 218 unsigned long ctx_idx; 219 220 /* User wants to only dump contexts from given ifindex */ 221 unsigned int match_ifindex; 222 unsigned int start_ctx; 223 }; 224 225 static struct rss_nl_dump_ctx *rss_dump_ctx(struct netlink_callback *cb) 226 { 227 NL_ASSERT_CTX_FITS(struct rss_nl_dump_ctx); 228 229 return (struct rss_nl_dump_ctx *)cb->ctx; 230 } 231 232 int ethnl_rss_dump_start(struct netlink_callback *cb) 233 { 234 const struct genl_info *info = genl_info_dump(cb); 235 struct rss_nl_dump_ctx *ctx = rss_dump_ctx(cb); 236 struct ethnl_req_info req_info = {}; 237 struct nlattr **tb = info->attrs; 238 int ret; 239 240 /* Filtering by context not supported */ 241 if (tb[ETHTOOL_A_RSS_CONTEXT]) { 242 NL_SET_BAD_ATTR(info->extack, tb[ETHTOOL_A_RSS_CONTEXT]); 243 return -EINVAL; 244 } 245 if (tb[ETHTOOL_A_RSS_START_CONTEXT]) { 246 ctx->start_ctx = nla_get_u32(tb[ETHTOOL_A_RSS_START_CONTEXT]); 247 ctx->ctx_idx = ctx->start_ctx; 248 } 249 250 ret = ethnl_parse_header_dev_get(&req_info, 251 tb[ETHTOOL_A_RSS_HEADER], 252 sock_net(cb->skb->sk), cb->extack, 253 false); 254 if (req_info.dev) { 255 ctx->match_ifindex = req_info.dev->ifindex; 256 ctx->ifindex = ctx->match_ifindex; 257 ethnl_parse_header_dev_put(&req_info); 258 req_info.dev = NULL; 259 } 260 261 return ret; 262 } 263 264 static int 265 rss_dump_one_ctx(struct sk_buff *skb, struct netlink_callback *cb, 266 struct net_device *dev, u32 rss_context) 267 { 268 const struct genl_info *info = genl_info_dump(cb); 269 struct rss_reply_data data = {}; 270 struct rss_req_info req = {}; 271 void *ehdr; 272 int ret; 273 274 req.rss_context = rss_context; 275 276 ehdr = ethnl_dump_put(skb, cb, ETHTOOL_MSG_RSS_GET_REPLY); 277 if (!ehdr) 278 return -EMSGSIZE; 279 280 ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_RSS_HEADER); 281 if (ret < 0) 282 goto err_cancel; 283 284 /* Context 0 is not currently storred or cached in the XArray */ 285 if (!rss_context) 286 ret = rss_prepare_get(&req, dev, &data, info); 287 else 288 ret = rss_prepare_ctx(&req, dev, &data, info); 289 if (ret) 290 goto err_cancel; 291 292 ret = rss_fill_reply(skb, &req.base, &data.base); 293 if (ret) 294 goto err_cleanup; 295 genlmsg_end(skb, ehdr); 296 297 rss_cleanup_data(&data.base); 298 return 0; 299 300 err_cleanup: 301 rss_cleanup_data(&data.base); 302 err_cancel: 303 genlmsg_cancel(skb, ehdr); 304 return ret; 305 } 306 307 static int 308 rss_dump_one_dev(struct sk_buff *skb, struct netlink_callback *cb, 309 struct net_device *dev) 310 { 311 struct rss_nl_dump_ctx *ctx = rss_dump_ctx(cb); 312 int ret; 313 314 if (!dev->ethtool_ops->get_rxfh) 315 return 0; 316 317 if (!ctx->ctx_idx) { 318 ret = rss_dump_one_ctx(skb, cb, dev, 0); 319 if (ret) 320 return ret; 321 ctx->ctx_idx++; 322 } 323 324 for (; xa_find(&dev->ethtool->rss_ctx, &ctx->ctx_idx, 325 ULONG_MAX, XA_PRESENT); ctx->ctx_idx++) { 326 ret = rss_dump_one_ctx(skb, cb, dev, ctx->ctx_idx); 327 if (ret) 328 return ret; 329 } 330 ctx->ctx_idx = ctx->start_ctx; 331 332 return 0; 333 } 334 335 int ethnl_rss_dumpit(struct sk_buff *skb, struct netlink_callback *cb) 336 { 337 struct rss_nl_dump_ctx *ctx = rss_dump_ctx(cb); 338 struct net *net = sock_net(skb->sk); 339 struct net_device *dev; 340 int ret = 0; 341 342 rtnl_lock(); 343 for_each_netdev_dump(net, dev, ctx->ifindex) { 344 if (ctx->match_ifindex && ctx->match_ifindex != ctx->ifindex) 345 break; 346 347 ret = rss_dump_one_dev(skb, cb, dev); 348 if (ret) 349 break; 350 } 351 rtnl_unlock(); 352 353 return ret; 354 } 355 356 const struct ethnl_request_ops ethnl_rss_request_ops = { 357 .request_cmd = ETHTOOL_MSG_RSS_GET, 358 .reply_cmd = ETHTOOL_MSG_RSS_GET_REPLY, 359 .hdr_attr = ETHTOOL_A_RSS_HEADER, 360 .req_info_size = sizeof(struct rss_req_info), 361 .reply_data_size = sizeof(struct rss_reply_data), 362 363 .parse_request = rss_parse_request, 364 .prepare_data = rss_prepare_data, 365 .reply_size = rss_reply_size, 366 .fill_reply = rss_fill_reply, 367 .cleanup_data = rss_cleanup_data, 368 }; 369