lib/librte_gro/gro_vxlan_tcp4.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Intel Corporation
   3  */
   4
   5 #include <rte_malloc.h>
   6 #include <rte_mbuf.h>
   7 #include <rte_cycles.h>
   8 #include <rte_ethdev.h>
   9 #include <rte_udp.h>
  10
  11 #include "gro_vxlan_tcp4.h"
  12
  13 void *
  14 gro_vxlan_tcp4_tbl_create(uint16_t socket_id,
  15                 uint16_t max_flow_num,
  16                 uint16_t max_item_per_flow)
  17 {
  18         struct gro_vxlan_tcp4_tbl *tbl;
  19         size_t size;
  20         uint32_t entries_num, i;
  21
  22         entries_num = max_flow_num * max_item_per_flow;
  23         entries_num = RTE_MIN(entries_num, GRO_VXLAN_TCP4_TBL_MAX_ITEM_NUM);
  24
  25         if (entries_num == 0)
  26                 return NULL;
  27
  28         tbl = rte_zmalloc_socket(__func__,
  29                         sizeof(struct gro_vxlan_tcp4_tbl),
  30                         RTE_CACHE_LINE_SIZE,
  31                         socket_id);
  32         if (tbl == NULL)
  33                 return NULL;
  34
  35         size = sizeof(struct gro_vxlan_tcp4_item) * entries_num;
  36         tbl->items = rte_zmalloc_socket(__func__,
  37                         size,
  38                         RTE_CACHE_LINE_SIZE,
  39                         socket_id);
  40         if (tbl->items == NULL) {
  41                 rte_free(tbl);
  42                 return NULL;
  43         }
  44         tbl->max_item_num = entries_num;
  45
  46         size = sizeof(struct gro_vxlan_tcp4_flow) * entries_num;
  47         tbl->flows = rte_zmalloc_socket(__func__,
  48                         size,
  49                         RTE_CACHE_LINE_SIZE,
  50                         socket_id);
  51         if (tbl->flows == NULL) {
  52                 rte_free(tbl->items);
  53                 rte_free(tbl);
  54                 return NULL;
  55         }
  56
  57         for (i = 0; i < entries_num; i++)
  58                 tbl->flows[i].start_index = INVALID_ARRAY_INDEX;
  59         tbl->max_flow_num = entries_num;
  60
  61         return tbl;
  62 }
  63
  64 void
  65 gro_vxlan_tcp4_tbl_destroy(void *tbl)
  66 {
  67         struct gro_vxlan_tcp4_tbl *vxlan_tbl = tbl;
  68
  69         if (vxlan_tbl) {
  70                 rte_free(vxlan_tbl->items);
  71                 rte_free(vxlan_tbl->flows);
  72         }
  73         rte_free(vxlan_tbl);
  74 }
  75
  76 static inline uint32_t
  77 find_an_empty_item(struct gro_vxlan_tcp4_tbl *tbl)
  78 {
  79         uint32_t max_item_num = tbl->max_item_num, i;
  80
  81         for (i = 0; i < max_item_num; i++)
  82                 if (tbl->items[i].inner_item.firstseg == NULL)
  83                         return i;
  84         return INVALID_ARRAY_INDEX;
  85 }
  86
  87 static inline uint32_t
  88 find_an_empty_flow(struct gro_vxlan_tcp4_tbl *tbl)
  89 {
  90         uint32_t max_flow_num = tbl->max_flow_num, i;
  91
  92         for (i = 0; i < max_flow_num; i++)
  93                 if (tbl->flows[i].start_index == INVALID_ARRAY_INDEX)
  94                         return i;
  95         return INVALID_ARRAY_INDEX;
  96 }
  97
  98 static inline uint32_t
  99 insert_new_item(struct gro_vxlan_tcp4_tbl *tbl,
 100                 struct rte_mbuf *pkt,
 101                 uint64_t start_time,
 102                 uint32_t prev_idx,
 103                 uint32_t sent_seq,
 104                 uint16_t outer_ip_id,
 105                 uint16_t ip_id,
 106                 uint8_t outer_is_atomic,
 107                 uint8_t is_atomic)
 108 {
 109         uint32_t item_idx;
 110
 111         item_idx = find_an_empty_item(tbl);
 112         if (unlikely(item_idx == INVALID_ARRAY_INDEX))
 113                 return INVALID_ARRAY_INDEX;
 114
 115         tbl->items[item_idx].inner_item.firstseg = pkt;
 116         tbl->items[item_idx].inner_item.lastseg = rte_pktmbuf_lastseg(pkt);
 117         tbl->items[item_idx].inner_item.start_time = start_time;
 118         tbl->items[item_idx].inner_item.next_pkt_idx = INVALID_ARRAY_INDEX;
 119         tbl->items[item_idx].inner_item.sent_seq = sent_seq;
 120         tbl->items[item_idx].inner_item.ip_id = ip_id;
 121         tbl->items[item_idx].inner_item.nb_merged = 1;
 122         tbl->items[item_idx].inner_item.is_atomic = is_atomic;
 123         tbl->items[item_idx].outer_ip_id = outer_ip_id;
 124         tbl->items[item_idx].outer_is_atomic = outer_is_atomic;
 125         tbl->item_num++;
 126
 127         /* If the previous packet exists, chain the new one with it. */
 128         if (prev_idx != INVALID_ARRAY_INDEX) {
 129                 tbl->items[item_idx].inner_item.next_pkt_idx =
 130                         tbl->items[prev_idx].inner_item.next_pkt_idx;
 131                 tbl->items[prev_idx].inner_item.next_pkt_idx = item_idx;
 132         }
 133
 134         return item_idx;
 135 }
 136
 137 static inline uint32_t
 138 delete_item(struct gro_vxlan_tcp4_tbl *tbl,
 139                 uint32_t item_idx,
 140                 uint32_t prev_item_idx)
 141 {
 142         uint32_t next_idx = tbl->items[item_idx].inner_item.next_pkt_idx;
 143
 144         /* NULL indicates an empty item. */
 145         tbl->items[item_idx].inner_item.firstseg = NULL;
 146         tbl->item_num--;
 147         if (prev_item_idx != INVALID_ARRAY_INDEX)
 148                 tbl->items[prev_item_idx].inner_item.next_pkt_idx = next_idx;
 149
 150         return next_idx;
 151 }
 152
 153 static inline uint32_t
 154 insert_new_flow(struct gro_vxlan_tcp4_tbl *tbl,
 155                 struct vxlan_tcp4_flow_key *src,
 156                 uint32_t item_idx)
 157 {
 158         struct vxlan_tcp4_flow_key *dst;
 159         uint32_t flow_idx;
 160
 161         flow_idx = find_an_empty_flow(tbl);
 162         if (unlikely(flow_idx == INVALID_ARRAY_INDEX))
 163                 return INVALID_ARRAY_INDEX;
 164
 165         dst = &(tbl->flows[flow_idx].key);
 166
 167         ether_addr_copy(&(src->inner_key.eth_saddr),
 168                         &(dst->inner_key.eth_saddr));
 169         ether_addr_copy(&(src->inner_key.eth_daddr),
 170                         &(dst->inner_key.eth_daddr));
 171         dst->inner_key.ip_src_addr = src->inner_key.ip_src_addr;
 172         dst->inner_key.ip_dst_addr = src->inner_key.ip_dst_addr;
 173         dst->inner_key.recv_ack = src->inner_key.recv_ack;
 174         dst->inner_key.src_port = src->inner_key.src_port;
 175         dst->inner_key.dst_port = src->inner_key.dst_port;
 176
 177         dst->vxlan_hdr.vx_flags = src->vxlan_hdr.vx_flags;
 178         dst->vxlan_hdr.vx_vni = src->vxlan_hdr.vx_vni;
 179         ether_addr_copy(&(src->outer_eth_saddr), &(dst->outer_eth_saddr));
 180         ether_addr_copy(&(src->outer_eth_daddr), &(dst->outer_eth_daddr));
 181         dst->outer_ip_src_addr = src->outer_ip_src_addr;
 182         dst->outer_ip_dst_addr = src->outer_ip_dst_addr;
 183         dst->outer_src_port = src->outer_src_port;
 184         dst->outer_dst_port = src->outer_dst_port;
 185
 186         tbl->flows[flow_idx].start_index = item_idx;
 187         tbl->flow_num++;
 188
 189         return flow_idx;
 190 }
 191
 192 static inline int
 193 is_same_vxlan_tcp4_flow(struct vxlan_tcp4_flow_key k1,
 194                 struct vxlan_tcp4_flow_key k2)
 195 {
 196         return (is_same_ether_addr(&k1.outer_eth_saddr, &k2.outer_eth_saddr) &&
 197                         is_same_ether_addr(&k1.outer_eth_daddr,
 198                                 &k2.outer_eth_daddr) &&
 199                         (k1.outer_ip_src_addr == k2.outer_ip_src_addr) &&
 200                         (k1.outer_ip_dst_addr == k2.outer_ip_dst_addr) &&
 201                         (k1.outer_src_port == k2.outer_src_port) &&
 202                         (k1.outer_dst_port == k2.outer_dst_port) &&
 203                         (k1.vxlan_hdr.vx_flags == k2.vxlan_hdr.vx_flags) &&
 204                         (k1.vxlan_hdr.vx_vni == k2.vxlan_hdr.vx_vni) &&
 205                         is_same_tcp4_flow(k1.inner_key, k2.inner_key));
 206 }
 207
 208 static inline int
 209 check_vxlan_seq_option(struct gro_vxlan_tcp4_item *item,
 210                 struct tcp_hdr *tcp_hdr,
 211                 uint32_t sent_seq,
 212                 uint16_t outer_ip_id,
 213                 uint16_t ip_id,
 214                 uint16_t tcp_hl,
 215                 uint16_t tcp_dl,
 216                 uint8_t outer_is_atomic,
 217                 uint8_t is_atomic)
 218 {
 219         struct rte_mbuf *pkt = item->inner_item.firstseg;
 220         int cmp;
 221         uint16_t l2_offset;
 222
 223         /* Don't merge packets whose outer DF bits are different. */
 224         if (unlikely(item->outer_is_atomic ^ outer_is_atomic))
 225                 return 0;
 226
 227         l2_offset = pkt->outer_l2_len + pkt->outer_l3_len;
 228         cmp = check_seq_option(&item->inner_item, tcp_hdr, sent_seq, ip_id,
 229                         tcp_hl, tcp_dl, l2_offset, is_atomic);
 230         if ((cmp > 0) && (outer_is_atomic ||
 231                                 (outer_ip_id == item->outer_ip_id + 1)))
 232                 /* Append the new packet. */
 233                 return 1;
 234         else if ((cmp < 0) && (outer_is_atomic ||
 235                                 (outer_ip_id + item->inner_item.nb_merged ==
 236                                  item->outer_ip_id)))
 237                 /* Prepend the new packet. */
 238                 return -1;
 239
 240         return 0;
 241 }
 242
 243 static inline int
 244 merge_two_vxlan_tcp4_packets(struct gro_vxlan_tcp4_item *item,
 245                 struct rte_mbuf *pkt,
 246                 int cmp,
 247                 uint32_t sent_seq,
 248                 uint16_t outer_ip_id,
 249                 uint16_t ip_id)
 250 {
 251         if (merge_two_tcp4_packets(&item->inner_item, pkt, cmp, sent_seq,
 252                                 ip_id, pkt->outer_l2_len +
 253                                 pkt->outer_l3_len)) {
 254                 /* Update the outer IPv4 ID to the large value. */
 255                 item->outer_ip_id = cmp > 0 ? outer_ip_id : item->outer_ip_id;
 256                 return 1;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static inline void
 263 update_vxlan_header(struct gro_vxlan_tcp4_item *item)
 264 {
 265         struct ipv4_hdr *ipv4_hdr;
 266         struct udp_hdr *udp_hdr;
 267         struct rte_mbuf *pkt = item->inner_item.firstseg;
 268         uint16_t len;
 269
 270         /* Update the outer IPv4 header. */
 271         len = pkt->pkt_len - pkt->outer_l2_len;
 272         ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
 273                         pkt->outer_l2_len);
 274         ipv4_hdr->total_length = rte_cpu_to_be_16(len);
 275
 276         /* Update the outer UDP header. */
 277         len -= pkt->outer_l3_len;
 278         udp_hdr = (struct udp_hdr *)((char *)ipv4_hdr + pkt->outer_l3_len);
 279         udp_hdr->dgram_len = rte_cpu_to_be_16(len);
 280
 281         /* Update the inner IPv4 header. */
 282         len -= pkt->l2_len;
 283         ipv4_hdr = (struct ipv4_hdr *)((char *)udp_hdr + pkt->l2_len);
 284         ipv4_hdr->total_length = rte_cpu_to_be_16(len);
 285 }
 286
 287 int32_t
 288 gro_vxlan_tcp4_reassemble(struct rte_mbuf *pkt,
 289                 struct gro_vxlan_tcp4_tbl *tbl,
 290                 uint64_t start_time)
 291 {
 292         struct rte_ether_hdr *outer_eth_hdr, *eth_hdr;
 293         struct ipv4_hdr *outer_ipv4_hdr, *ipv4_hdr;
 294         struct tcp_hdr *tcp_hdr;
 295         struct udp_hdr *udp_hdr;
 296         struct rte_vxlan_hdr *vxlan_hdr;
 297         uint32_t sent_seq;
 298         int32_t tcp_dl;
 299         uint16_t frag_off, outer_ip_id, ip_id;
 300         uint8_t outer_is_atomic, is_atomic;
 301
 302         struct vxlan_tcp4_flow_key key;
 303         uint32_t cur_idx, prev_idx, item_idx;
 304         uint32_t i, max_flow_num, remaining_flow_num;
 305         int cmp;
 306         uint16_t hdr_len;
 307         uint8_t find;
 308
 309         /*
 310          * Don't process the packet whose TCP header length is greater
 311          * than 60 bytes or less than 20 bytes.
 312          */
 313         if (unlikely(INVALID_TCP_HDRLEN(pkt->l4_len)))
 314                 return -1;
 315
 316         outer_eth_hdr = rte_pktmbuf_mtod(pkt, struct rte_ether_hdr *);
 317         outer_ipv4_hdr = (struct ipv4_hdr *)((char *)outer_eth_hdr +
 318                         pkt->outer_l2_len);
 319         udp_hdr = (struct udp_hdr *)((char *)outer_ipv4_hdr +
 320                         pkt->outer_l3_len);
 321         vxlan_hdr = (struct rte_vxlan_hdr *)((char *)udp_hdr +
 322                         sizeof(struct udp_hdr));
 323         eth_hdr = (struct rte_ether_hdr *)((char *)vxlan_hdr +
 324                         sizeof(struct rte_vxlan_hdr));
 325         ipv4_hdr = (struct ipv4_hdr *)((char *)udp_hdr + pkt->l2_len);
 326         tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + pkt->l3_len);
 327
 328         /*
 329          * Don't process the packet which has FIN, SYN, RST, PSH, URG,
 330          * ECE or CWR set.
 331          */
 332         if (tcp_hdr->tcp_flags != TCP_ACK_FLAG)
 333                 return -1;
 334
 335         hdr_len = pkt->outer_l2_len + pkt->outer_l3_len + pkt->l2_len +
 336                 pkt->l3_len + pkt->l4_len;
 337         /*
 338          * Don't process the packet whose payload length is less than or
 339          * equal to 0.
 340          */
 341         tcp_dl = pkt->pkt_len - hdr_len;
 342         if (tcp_dl <= 0)
 343                 return -1;
 344
 345         /*
 346          * Save IPv4 ID for the packet whose DF bit is 0. For the packet
 347          * whose DF bit is 1, IPv4 ID is ignored.
 348          */
 349         frag_off = rte_be_to_cpu_16(outer_ipv4_hdr->fragment_offset);
 350         outer_is_atomic = (frag_off & IPV4_HDR_DF_FLAG) == IPV4_HDR_DF_FLAG;
 351         outer_ip_id = outer_is_atomic ? 0 :
 352                 rte_be_to_cpu_16(outer_ipv4_hdr->packet_id);
 353         frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
 354         is_atomic = (frag_off & IPV4_HDR_DF_FLAG) == IPV4_HDR_DF_FLAG;
 355         ip_id = is_atomic ? 0 : rte_be_to_cpu_16(ipv4_hdr->packet_id);
 356
 357         sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
 358
 359         ether_addr_copy(&(eth_hdr->s_addr), &(key.inner_key.eth_saddr));
 360         ether_addr_copy(&(eth_hdr->d_addr), &(key.inner_key.eth_daddr));
 361         key.inner_key.ip_src_addr = ipv4_hdr->src_addr;
 362         key.inner_key.ip_dst_addr = ipv4_hdr->dst_addr;
 363         key.inner_key.recv_ack = tcp_hdr->recv_ack;
 364         key.inner_key.src_port = tcp_hdr->src_port;
 365         key.inner_key.dst_port = tcp_hdr->dst_port;
 366
 367         key.vxlan_hdr.vx_flags = vxlan_hdr->vx_flags;
 368         key.vxlan_hdr.vx_vni = vxlan_hdr->vx_vni;
 369         ether_addr_copy(&(outer_eth_hdr->s_addr), &(key.outer_eth_saddr));
 370         ether_addr_copy(&(outer_eth_hdr->d_addr), &(key.outer_eth_daddr));
 371         key.outer_ip_src_addr = outer_ipv4_hdr->src_addr;
 372         key.outer_ip_dst_addr = outer_ipv4_hdr->dst_addr;
 373         key.outer_src_port = udp_hdr->src_port;
 374         key.outer_dst_port = udp_hdr->dst_port;
 375
 376         /* Search for a matched flow. */
 377         max_flow_num = tbl->max_flow_num;
 378         remaining_flow_num = tbl->flow_num;
 379         find = 0;
 380         for (i = 0; i < max_flow_num && remaining_flow_num; i++) {
 381                 if (tbl->flows[i].start_index != INVALID_ARRAY_INDEX) {
 382                         if (is_same_vxlan_tcp4_flow(tbl->flows[i].key, key)) {
 383                                 find = 1;
 384                                 break;
 385                         }
 386                         remaining_flow_num--;
 387                 }
 388         }
 389
 390         /*
 391          * Can't find a matched flow. Insert a new flow and store the
 392          * packet into the flow.
 393          */
 394         if (find == 0) {
 395                 item_idx = insert_new_item(tbl, pkt, start_time,
 396                                 INVALID_ARRAY_INDEX, sent_seq, outer_ip_id,
 397                                 ip_id, outer_is_atomic, is_atomic);
 398                 if (item_idx == INVALID_ARRAY_INDEX)
 399                         return -1;
 400                 if (insert_new_flow(tbl, &key, item_idx) ==
 401                                 INVALID_ARRAY_INDEX) {
 402                         /*
 403                          * Fail to insert a new flow, so
 404                          * delete the inserted packet.
 405                          */
 406                         delete_item(tbl, item_idx, INVALID_ARRAY_INDEX);
 407                         return -1;
 408                 }
 409                 return 0;
 410         }
 411
 412         /* Check all packets in the flow and try to find a neighbor. */
 413         cur_idx = tbl->flows[i].start_index;
 414         prev_idx = cur_idx;
 415         do {
 416                 cmp = check_vxlan_seq_option(&(tbl->items[cur_idx]), tcp_hdr,
 417                                 sent_seq, outer_ip_id, ip_id, pkt->l4_len,
 418                                 tcp_dl, outer_is_atomic, is_atomic);
 419                 if (cmp) {
 420                         if (merge_two_vxlan_tcp4_packets(&(tbl->items[cur_idx]),
 421                                                 pkt, cmp, sent_seq,
 422                                                 outer_ip_id, ip_id))
 423                                 return 1;
 424                         /*
 425                          * Can't merge two packets, as the packet
 426                          * length will be greater than the max value.
 427                          * Insert the packet into the flow.
 428                          */
 429                         if (insert_new_item(tbl, pkt, start_time, prev_idx,
 430                                                 sent_seq, outer_ip_id,
 431                                                 ip_id, outer_is_atomic,
 432                                                 is_atomic) ==
 433                                         INVALID_ARRAY_INDEX)
 434                                 return -1;
 435                         return 0;
 436                 }
 437                 prev_idx = cur_idx;
 438                 cur_idx = tbl->items[cur_idx].inner_item.next_pkt_idx;
 439         } while (cur_idx != INVALID_ARRAY_INDEX);
 440
 441         /* Can't find neighbor. Insert the packet into the flow. */
 442         if (insert_new_item(tbl, pkt, start_time, prev_idx, sent_seq,
 443                                 outer_ip_id, ip_id, outer_is_atomic,
 444                                 is_atomic) == INVALID_ARRAY_INDEX)
 445                 return -1;
 446
 447         return 0;
 448 }
 449
 450 uint16_t
 451 gro_vxlan_tcp4_tbl_timeout_flush(struct gro_vxlan_tcp4_tbl *tbl,
 452                 uint64_t flush_timestamp,
 453                 struct rte_mbuf **out,
 454                 uint16_t nb_out)
 455 {
 456         uint16_t k = 0;
 457         uint32_t i, j;
 458         uint32_t max_flow_num = tbl->max_flow_num;
 459
 460         for (i = 0; i < max_flow_num; i++) {
 461                 if (unlikely(tbl->flow_num == 0))
 462                         return k;
 463
 464                 j = tbl->flows[i].start_index;
 465                 while (j != INVALID_ARRAY_INDEX) {
 466                         if (tbl->items[j].inner_item.start_time <=
 467                                         flush_timestamp) {
 468                                 out[k++] = tbl->items[j].inner_item.firstseg;
 469                                 if (tbl->items[j].inner_item.nb_merged > 1)
 470                                         update_vxlan_header(&(tbl->items[j]));
 471                                 /*
 472                                  * Delete the item and get the next packet
 473                                  * index.
 474                                  */
 475                                 j = delete_item(tbl, j, INVALID_ARRAY_INDEX);
 476                                 tbl->flows[i].start_index = j;
 477                                 if (j == INVALID_ARRAY_INDEX)
 478                                         tbl->flow_num--;
 479
 480                                 if (unlikely(k == nb_out))
 481                                         return k;
 482                         } else
 483                                 /*
 484                                  * The left packets in the flow won't be
 485                                  * timeout. Go to check other flows.
 486                                  */
 487                                 break;
 488                 }
 489         }
 490         return k;
 491 }
 492
 493 uint32_t
 494 gro_vxlan_tcp4_tbl_pkt_count(void *tbl)
 495 {
 496         struct gro_vxlan_tcp4_tbl *gro_tbl = tbl;
 497
 498         if (gro_tbl)
 499                 return gro_tbl->item_num;
 500
 501         return 0;
 502 }