1 /* 2 * Copyright (C) 2017 Netronome Systems, Inc. 3 * 4 * This software is dual licensed under the GNU General License Version 2, 5 * June 1991 as shown in the file COPYING in the top-level directory of this 6 * source tree or the BSD 2-Clause License provided below. You have the 7 * option to license this software under the complete terms of either license. 8 * 9 * The BSD 2-Clause License: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * 1. Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * 2. Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/hash.h> 35 #include <linux/hashtable.h> 36 #include <linux/jhash.h> 37 #include <linux/vmalloc.h> 38 #include <net/pkt_cls.h> 39 40 #include "cmsg.h" 41 #include "main.h" 42 #include "../nfp_app.h" 43 44 struct nfp_mask_id_table { 45 struct hlist_node link; 46 u32 hash_key; 47 u32 ref_cnt; 48 u8 mask_id; 49 }; 50 51 static int nfp_release_stats_entry(struct nfp_app *app, u32 stats_context_id) 52 { 53 struct nfp_flower_priv *priv = app->priv; 54 struct circ_buf *ring; 55 56 ring = &priv->stats_ids.free_list; 57 /* Check if buffer is full. */ 58 if (!CIRC_SPACE(ring->head, ring->tail, NFP_FL_STATS_ENTRY_RS * 59 NFP_FL_STATS_ELEM_RS - 60 NFP_FL_STATS_ELEM_RS + 1)) 61 return -ENOBUFS; 62 63 memcpy(&ring->buf[ring->head], &stats_context_id, NFP_FL_STATS_ELEM_RS); 64 ring->head = (ring->head + NFP_FL_STATS_ELEM_RS) % 65 (NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS); 66 67 return 0; 68 } 69 70 static int nfp_get_stats_entry(struct nfp_app *app, u32 *stats_context_id) 71 { 72 struct nfp_flower_priv *priv = app->priv; 73 u32 freed_stats_id, temp_stats_id; 74 struct circ_buf *ring; 75 76 ring = &priv->stats_ids.free_list; 77 freed_stats_id = NFP_FL_STATS_ENTRY_RS; 78 /* Check for unallocated entries first. */ 79 if (priv->stats_ids.init_unalloc > 0) { 80 *stats_context_id = priv->stats_ids.init_unalloc - 1; 81 priv->stats_ids.init_unalloc--; 82 return 0; 83 } 84 85 /* Check if buffer is empty. */ 86 if (ring->head == ring->tail) { 87 *stats_context_id = freed_stats_id; 88 return -ENOENT; 89 } 90 91 memcpy(&temp_stats_id, &ring->buf[ring->tail], NFP_FL_STATS_ELEM_RS); 92 *stats_context_id = temp_stats_id; 93 memcpy(&ring->buf[ring->tail], &freed_stats_id, NFP_FL_STATS_ELEM_RS); 94 ring->tail = (ring->tail + NFP_FL_STATS_ELEM_RS) % 95 (NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS); 96 97 return 0; 98 } 99 100 /* Must be called with either RTNL or rcu_read_lock */ 101 struct nfp_fl_payload * 102 nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie) 103 { 104 struct nfp_flower_priv *priv = app->priv; 105 struct nfp_fl_payload *flower_entry; 106 107 hash_for_each_possible_rcu(priv->flow_table, flower_entry, link, 108 tc_flower_cookie) 109 if (flower_entry->tc_flower_cookie == tc_flower_cookie) 110 return flower_entry; 111 112 return NULL; 113 } 114 115 static void 116 nfp_flower_update_stats(struct nfp_app *app, struct nfp_fl_stats_frame *stats) 117 { 118 struct nfp_fl_payload *nfp_flow; 119 unsigned long flower_cookie; 120 121 flower_cookie = be64_to_cpu(stats->stats_cookie); 122 123 rcu_read_lock(); 124 nfp_flow = nfp_flower_search_fl_table(app, flower_cookie); 125 if (!nfp_flow) 126 goto exit_rcu_unlock; 127 128 if (nfp_flow->meta.host_ctx_id != stats->stats_con_id) 129 goto exit_rcu_unlock; 130 131 spin_lock(&nfp_flow->lock); 132 nfp_flow->stats.pkts += be32_to_cpu(stats->pkt_count); 133 nfp_flow->stats.bytes += be64_to_cpu(stats->byte_count); 134 nfp_flow->stats.used = jiffies; 135 spin_unlock(&nfp_flow->lock); 136 137 exit_rcu_unlock: 138 rcu_read_unlock(); 139 } 140 141 void nfp_flower_rx_flow_stats(struct nfp_app *app, struct sk_buff *skb) 142 { 143 unsigned int msg_len = skb->len - NFP_FLOWER_CMSG_HLEN; 144 struct nfp_fl_stats_frame *stats_frame; 145 unsigned char *msg; 146 int i; 147 148 msg = nfp_flower_cmsg_get_data(skb); 149 150 stats_frame = (struct nfp_fl_stats_frame *)msg; 151 for (i = 0; i < msg_len / sizeof(*stats_frame); i++) 152 nfp_flower_update_stats(app, stats_frame + i); 153 } 154 155 static int nfp_release_mask_id(struct nfp_app *app, u8 mask_id) 156 { 157 struct nfp_flower_priv *priv = app->priv; 158 struct circ_buf *ring; 159 struct timespec64 now; 160 161 ring = &priv->mask_ids.mask_id_free_list; 162 /* Checking if buffer is full. */ 163 if (CIRC_SPACE(ring->head, ring->tail, NFP_FLOWER_MASK_ENTRY_RS) == 0) 164 return -ENOBUFS; 165 166 memcpy(&ring->buf[ring->head], &mask_id, NFP_FLOWER_MASK_ELEMENT_RS); 167 ring->head = (ring->head + NFP_FLOWER_MASK_ELEMENT_RS) % 168 (NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS); 169 170 getnstimeofday64(&now); 171 priv->mask_ids.last_used[mask_id] = now; 172 173 return 0; 174 } 175 176 static int nfp_mask_alloc(struct nfp_app *app, u8 *mask_id) 177 { 178 struct nfp_flower_priv *priv = app->priv; 179 struct timespec64 delta, now; 180 struct circ_buf *ring; 181 u8 temp_id, freed_id; 182 183 ring = &priv->mask_ids.mask_id_free_list; 184 freed_id = NFP_FLOWER_MASK_ENTRY_RS - 1; 185 /* Checking for unallocated entries first. */ 186 if (priv->mask_ids.init_unallocated > 0) { 187 *mask_id = priv->mask_ids.init_unallocated; 188 priv->mask_ids.init_unallocated--; 189 return 0; 190 } 191 192 /* Checking if buffer is empty. */ 193 if (ring->head == ring->tail) 194 goto err_not_found; 195 196 memcpy(&temp_id, &ring->buf[ring->tail], NFP_FLOWER_MASK_ELEMENT_RS); 197 *mask_id = temp_id; 198 199 getnstimeofday64(&now); 200 delta = timespec64_sub(now, priv->mask_ids.last_used[*mask_id]); 201 202 if (timespec64_to_ns(&delta) < NFP_FL_MASK_REUSE_TIME_NS) 203 goto err_not_found; 204 205 memcpy(&ring->buf[ring->tail], &freed_id, NFP_FLOWER_MASK_ELEMENT_RS); 206 ring->tail = (ring->tail + NFP_FLOWER_MASK_ELEMENT_RS) % 207 (NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS); 208 209 return 0; 210 211 err_not_found: 212 *mask_id = freed_id; 213 return -ENOENT; 214 } 215 216 static int 217 nfp_add_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len) 218 { 219 struct nfp_flower_priv *priv = app->priv; 220 struct nfp_mask_id_table *mask_entry; 221 unsigned long hash_key; 222 u8 mask_id; 223 224 if (nfp_mask_alloc(app, &mask_id)) 225 return -ENOENT; 226 227 mask_entry = kmalloc(sizeof(*mask_entry), GFP_KERNEL); 228 if (!mask_entry) { 229 nfp_release_mask_id(app, mask_id); 230 return -ENOMEM; 231 } 232 233 INIT_HLIST_NODE(&mask_entry->link); 234 mask_entry->mask_id = mask_id; 235 hash_key = jhash(mask_data, mask_len, priv->mask_id_seed); 236 mask_entry->hash_key = hash_key; 237 mask_entry->ref_cnt = 1; 238 hash_add(priv->mask_table, &mask_entry->link, hash_key); 239 240 return mask_id; 241 } 242 243 static struct nfp_mask_id_table * 244 nfp_search_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len) 245 { 246 struct nfp_flower_priv *priv = app->priv; 247 struct nfp_mask_id_table *mask_entry; 248 unsigned long hash_key; 249 250 hash_key = jhash(mask_data, mask_len, priv->mask_id_seed); 251 252 hash_for_each_possible(priv->mask_table, mask_entry, link, hash_key) 253 if (mask_entry->hash_key == hash_key) 254 return mask_entry; 255 256 return NULL; 257 } 258 259 static int 260 nfp_find_in_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len) 261 { 262 struct nfp_mask_id_table *mask_entry; 263 264 mask_entry = nfp_search_mask_table(app, mask_data, mask_len); 265 if (!mask_entry) 266 return -ENOENT; 267 268 mask_entry->ref_cnt++; 269 270 /* Casting u8 to int for later use. */ 271 return mask_entry->mask_id; 272 } 273 274 static bool 275 nfp_check_mask_add(struct nfp_app *app, char *mask_data, u32 mask_len, 276 u8 *meta_flags, u8 *mask_id) 277 { 278 int id; 279 280 id = nfp_find_in_mask_table(app, mask_data, mask_len); 281 if (id < 0) { 282 id = nfp_add_mask_table(app, mask_data, mask_len); 283 if (id < 0) 284 return false; 285 *meta_flags |= NFP_FL_META_FLAG_NEW_MASK; 286 } 287 *mask_id = id; 288 289 return true; 290 } 291 292 static bool 293 nfp_check_mask_remove(struct nfp_app *app, char *mask_data, u32 mask_len, 294 u8 *meta_flags, u8 *mask_id) 295 { 296 struct nfp_mask_id_table *mask_entry; 297 298 mask_entry = nfp_search_mask_table(app, mask_data, mask_len); 299 if (!mask_entry) 300 return false; 301 302 *mask_id = mask_entry->mask_id; 303 mask_entry->ref_cnt--; 304 if (!mask_entry->ref_cnt) { 305 hash_del(&mask_entry->link); 306 nfp_release_mask_id(app, *mask_id); 307 kfree(mask_entry); 308 if (meta_flags) 309 *meta_flags |= NFP_FL_META_FLAG_LAST_MASK; 310 } 311 312 return true; 313 } 314 315 int nfp_compile_flow_metadata(struct nfp_app *app, 316 struct tc_cls_flower_offload *flow, 317 struct nfp_fl_payload *nfp_flow) 318 { 319 struct nfp_flower_priv *priv = app->priv; 320 struct nfp_fl_payload *check_entry; 321 u8 new_mask_id; 322 u32 stats_cxt; 323 324 if (nfp_get_stats_entry(app, &stats_cxt)) 325 return -ENOENT; 326 327 nfp_flow->meta.host_ctx_id = cpu_to_be32(stats_cxt); 328 nfp_flow->meta.host_cookie = cpu_to_be64(flow->cookie); 329 330 new_mask_id = 0; 331 if (!nfp_check_mask_add(app, nfp_flow->mask_data, 332 nfp_flow->meta.mask_len, 333 &nfp_flow->meta.flags, &new_mask_id)) { 334 if (nfp_release_stats_entry(app, stats_cxt)) 335 return -EINVAL; 336 return -ENOENT; 337 } 338 339 nfp_flow->meta.flow_version = cpu_to_be64(priv->flower_version); 340 priv->flower_version++; 341 342 /* Update flow payload with mask ids. */ 343 nfp_flow->unmasked_data[NFP_FL_MASK_ID_LOCATION] = new_mask_id; 344 nfp_flow->stats.pkts = 0; 345 nfp_flow->stats.bytes = 0; 346 nfp_flow->stats.used = jiffies; 347 348 check_entry = nfp_flower_search_fl_table(app, flow->cookie); 349 if (check_entry) { 350 if (nfp_release_stats_entry(app, stats_cxt)) 351 return -EINVAL; 352 353 if (!nfp_check_mask_remove(app, nfp_flow->mask_data, 354 nfp_flow->meta.mask_len, 355 NULL, &new_mask_id)) 356 return -EINVAL; 357 358 return -EEXIST; 359 } 360 361 return 0; 362 } 363 364 int nfp_modify_flow_metadata(struct nfp_app *app, 365 struct nfp_fl_payload *nfp_flow) 366 { 367 struct nfp_flower_priv *priv = app->priv; 368 u8 new_mask_id = 0; 369 u32 temp_ctx_id; 370 371 nfp_check_mask_remove(app, nfp_flow->mask_data, 372 nfp_flow->meta.mask_len, &nfp_flow->meta.flags, 373 &new_mask_id); 374 375 nfp_flow->meta.flow_version = cpu_to_be64(priv->flower_version); 376 priv->flower_version++; 377 378 /* Update flow payload with mask ids. */ 379 nfp_flow->unmasked_data[NFP_FL_MASK_ID_LOCATION] = new_mask_id; 380 381 /* Release the stats ctx id. */ 382 temp_ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id); 383 384 return nfp_release_stats_entry(app, temp_ctx_id); 385 } 386 387 int nfp_flower_metadata_init(struct nfp_app *app) 388 { 389 struct nfp_flower_priv *priv = app->priv; 390 391 hash_init(priv->mask_table); 392 hash_init(priv->flow_table); 393 get_random_bytes(&priv->mask_id_seed, sizeof(priv->mask_id_seed)); 394 395 /* Init ring buffer and unallocated mask_ids. */ 396 priv->mask_ids.mask_id_free_list.buf = 397 kmalloc_array(NFP_FLOWER_MASK_ENTRY_RS, 398 NFP_FLOWER_MASK_ELEMENT_RS, GFP_KERNEL); 399 if (!priv->mask_ids.mask_id_free_list.buf) 400 return -ENOMEM; 401 402 priv->mask_ids.init_unallocated = NFP_FLOWER_MASK_ENTRY_RS - 1; 403 404 /* Init timestamps for mask id*/ 405 priv->mask_ids.last_used = 406 kmalloc_array(NFP_FLOWER_MASK_ENTRY_RS, 407 sizeof(*priv->mask_ids.last_used), GFP_KERNEL); 408 if (!priv->mask_ids.last_used) 409 goto err_free_mask_id; 410 411 /* Init ring buffer and unallocated stats_ids. */ 412 priv->stats_ids.free_list.buf = 413 vmalloc(NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS); 414 if (!priv->stats_ids.free_list.buf) 415 goto err_free_last_used; 416 417 priv->stats_ids.init_unalloc = NFP_FL_REPEATED_HASH_MAX; 418 419 return 0; 420 421 err_free_last_used: 422 kfree(priv->mask_ids.last_used); 423 err_free_mask_id: 424 kfree(priv->mask_ids.mask_id_free_list.buf); 425 return -ENOMEM; 426 } 427 428 void nfp_flower_metadata_cleanup(struct nfp_app *app) 429 { 430 struct nfp_flower_priv *priv = app->priv; 431 432 if (!priv) 433 return; 434 435 kfree(priv->mask_ids.mask_id_free_list.buf); 436 kfree(priv->mask_ids.last_used); 437 vfree(priv->stats_ids.free_list.buf); 438 } 439