examples/quota_watermark/qw/main.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <rte_eal.h>
   6
   7 #include <rte_common.h>
   8 #include <rte_debug.h>
   9 #include <rte_errno.h>
  10 #include <rte_ethdev.h>
  11 #include <rte_launch.h>
  12 #include <rte_lcore.h>
  13 #include <rte_log.h>
  14 #include <rte_mbuf.h>
  15 #include <rte_ring.h>
  16
  17 #include <rte_byteorder.h>
  18
  19 #include "args.h"
  20 #include "main.h"
  21 #include "init.h"
  22 #include "../include/conf.h"
  23
  24
  25 #ifdef QW_SOFTWARE_FC
  26 #define SEND_PAUSE_FRAME(port_id, duration) send_pause_frame(port_id, duration)
  27 #else
  28 #define SEND_PAUSE_FRAME(port_id, duration) do { } while(0)
  29 #endif
  30
  31 #define ETHER_TYPE_FLOW_CONTROL 0x8808
  32
  33 struct ether_fc_frame {
  34         uint16_t opcode;
  35         uint16_t param;
  36 } __attribute__((__packed__));
  37
  38
  39 int *quota;
  40 unsigned int *low_watermark;
  41 unsigned int *high_watermark;
  42
  43 uint16_t port_pairs[RTE_MAX_ETHPORTS];
  44
  45 struct rte_ring *rings[RTE_MAX_LCORE][RTE_MAX_ETHPORTS];
  46 struct rte_mempool *mbuf_pool;
  47
  48
  49 static void send_pause_frame(uint16_t port_id, uint16_t duration)
  50 {
  51         struct rte_mbuf *mbuf;
  52         struct ether_fc_frame *pause_frame;
  53         struct rte_ether_hdr *hdr;
  54         struct rte_ether_addr mac_addr;
  55
  56         RTE_LOG_DP(DEBUG, USER1,
  57                         "Sending PAUSE frame (duration=%d) on port %d\n",
  58                         duration, port_id);
  59
  60         /* Get a mbuf from the pool */
  61         mbuf = rte_pktmbuf_alloc(mbuf_pool);
  62         if (unlikely(mbuf == NULL))
  63                 return;
  64
  65         /* Prepare a PAUSE frame */
  66         hdr = rte_pktmbuf_mtod(mbuf, struct rte_ether_hdr *);
  67         pause_frame = (struct ether_fc_frame *) &hdr[1];
  68
  69         rte_eth_macaddr_get(port_id, &mac_addr);
  70         ether_addr_copy(&mac_addr, &hdr->s_addr);
  71
  72         void *tmp = &hdr->d_addr.addr_bytes[0];
  73         *((uint64_t *)tmp) = 0x010000C28001ULL;
  74
  75         hdr->ether_type = rte_cpu_to_be_16(ETHER_TYPE_FLOW_CONTROL);
  76
  77         pause_frame->opcode = rte_cpu_to_be_16(0x0001);
  78         pause_frame->param  = rte_cpu_to_be_16(duration);
  79
  80         mbuf->pkt_len  = 60;
  81         mbuf->data_len = 60;
  82
  83         rte_eth_tx_burst(port_id, 0, &mbuf, 1);
  84 }
  85
  86 /**
  87  * Get the previous enabled lcore ID
  88  *
  89  * @param lcore_id
  90  *   The current lcore ID.
  91  * @return
  92  *   The previous enabled lcore_id or -1 if not found.
  93  */
  94 static unsigned int
  95 get_previous_lcore_id(unsigned int lcore_id)
  96 {
  97         int i;
  98
  99         for (i = lcore_id - 1; i >= 0; i--)
 100                 if (rte_lcore_is_enabled(i))
 101                         return i;
 102
 103         return -1;
 104 }
 105
 106 /**
 107  * Get the last enabled lcore ID
 108  *
 109  * @return
 110  *   The last enabled lcore_id.
 111  */
 112 static unsigned int
 113 get_last_lcore_id(void)
 114 {
 115         int i;
 116
 117         for (i = RTE_MAX_LCORE; i >= 0; i--)
 118                 if (rte_lcore_is_enabled(i))
 119                         return i;
 120
 121         return 0;
 122 }
 123
 124 static void
 125 receive_stage(__attribute__((unused)) void *args)
 126 {
 127         int i, ret;
 128
 129         uint16_t port_id;
 130         uint16_t nb_rx_pkts;
 131
 132         unsigned int lcore_id;
 133         unsigned int free;
 134
 135         struct rte_mbuf *pkts[MAX_PKT_QUOTA];
 136         struct rte_ring *ring;
 137         enum ring_state ring_state[RTE_MAX_ETHPORTS] = { RING_READY };
 138
 139         lcore_id = rte_lcore_id();
 140
 141         RTE_LOG(INFO, USER1,
 142                         "%s() started on core %u\n", __func__, lcore_id);
 143
 144         while (1) {
 145
 146                 /* Process each port round robin style */
 147                 for (port_id = 0; port_id < RTE_MAX_ETHPORTS; port_id++) {
 148
 149                         if (!is_bit_set(port_id, portmask))
 150                                 continue;
 151
 152                         ring = rings[lcore_id][port_id];
 153
 154                         if (ring_state[port_id] != RING_READY) {
 155                                 if (rte_ring_count(ring) > *low_watermark)
 156                                         continue;
 157                                 else
 158                                         ring_state[port_id] = RING_READY;
 159                         }
 160
 161                         /* Enqueue received packets on the RX ring */
 162                         nb_rx_pkts = rte_eth_rx_burst(port_id, 0, pkts,
 163                                         (uint16_t) *quota);
 164                         ret = rte_ring_enqueue_bulk(ring, (void *) pkts,
 165                                         nb_rx_pkts, &free);
 166                         if (RING_SIZE - free > *high_watermark) {
 167                                 ring_state[port_id] = RING_OVERLOADED;
 168                                 send_pause_frame(port_id, 1337);
 169                         }
 170
 171                         if (ret == 0) {
 172
 173                                 /*
 174                                  * Return  mbufs to the pool,
 175                                  * effectively dropping packets
 176                                  */
 177                                 for (i = 0; i < nb_rx_pkts; i++)
 178                                         rte_pktmbuf_free(pkts[i]);
 179                         }
 180                 }
 181         }
 182 }
 183
 184 static int
 185 pipeline_stage(__attribute__((unused)) void *args)
 186 {
 187         int i, ret;
 188         int nb_dq_pkts;
 189
 190         uint16_t port_id;
 191
 192         unsigned int lcore_id, previous_lcore_id;
 193         unsigned int free;
 194
 195         void *pkts[MAX_PKT_QUOTA];
 196         struct rte_ring *rx, *tx;
 197         enum ring_state ring_state[RTE_MAX_ETHPORTS] = { RING_READY };
 198
 199         lcore_id = rte_lcore_id();
 200         previous_lcore_id = get_previous_lcore_id(lcore_id);
 201
 202         RTE_LOG(INFO, USER1,
 203                         "%s() started on core %u - processing packets from core %u\n",
 204                         __func__, lcore_id, previous_lcore_id);
 205
 206         while (1) {
 207
 208                 for (port_id = 0; port_id < RTE_MAX_ETHPORTS; port_id++) {
 209
 210                         if (!is_bit_set(port_id, portmask))
 211                                 continue;
 212
 213                         tx = rings[lcore_id][port_id];
 214                         rx = rings[previous_lcore_id][port_id];
 215
 216                         if (ring_state[port_id] != RING_READY) {
 217                                 if (rte_ring_count(tx) > *low_watermark)
 218                                         continue;
 219                                 else
 220                                         ring_state[port_id] = RING_READY;
 221                         }
 222
 223                         /* Dequeue up to quota mbuf from rx */
 224                         nb_dq_pkts = rte_ring_dequeue_burst(rx, pkts,
 225                                         *quota, NULL);
 226                         if (unlikely(nb_dq_pkts < 0))
 227                                 continue;
 228
 229                         /* Enqueue them on tx */
 230                         ret = rte_ring_enqueue_bulk(tx, pkts,
 231                                         nb_dq_pkts, &free);
 232                         if (RING_SIZE - free > *high_watermark)
 233                                 ring_state[port_id] = RING_OVERLOADED;
 234
 235                         if (ret == 0) {
 236
 237                                 /*
 238                                  * Return  mbufs to the pool,
 239                                  * effectively dropping packets
 240                                  */
 241                                 for (i = 0; i < nb_dq_pkts; i++)
 242                                         rte_pktmbuf_free(pkts[i]);
 243                         }
 244                 }
 245         }
 246
 247         return 0;
 248 }
 249
 250 static int
 251 send_stage(__attribute__((unused)) void *args)
 252 {
 253         uint16_t nb_dq_pkts;
 254
 255         uint16_t port_id;
 256         uint16_t dest_port_id;
 257
 258         unsigned int lcore_id, previous_lcore_id;
 259
 260         struct rte_ring *tx;
 261         struct rte_mbuf *tx_pkts[MAX_PKT_QUOTA];
 262
 263         lcore_id = rte_lcore_id();
 264         previous_lcore_id = get_previous_lcore_id(lcore_id);
 265
 266         RTE_LOG(INFO, USER1,
 267                         "%s() started on core %u - processing packets from core %u\n",
 268                         __func__, lcore_id, previous_lcore_id);
 269
 270         while (1) {
 271
 272                 /* Process each ring round robin style */
 273                 for (port_id = 0; port_id < RTE_MAX_ETHPORTS; port_id++) {
 274
 275                         if (!is_bit_set(port_id, portmask))
 276                                 continue;
 277
 278                         dest_port_id = port_pairs[port_id];
 279                         tx = rings[previous_lcore_id][port_id];
 280
 281                         if (rte_ring_empty(tx))
 282                                 continue;
 283
 284                         /* Dequeue packets from tx and send them */
 285                         nb_dq_pkts = (uint16_t) rte_ring_dequeue_burst(tx,
 286                                         (void *) tx_pkts, *quota, NULL);
 287                         rte_eth_tx_burst(dest_port_id, 0, tx_pkts, nb_dq_pkts);
 288
 289                         /* TODO: Check if nb_dq_pkts == nb_tx_pkts? */
 290                 }
 291         }
 292
 293         return 0;
 294 }
 295
 296 int
 297 main(int argc, char **argv)
 298 {
 299         int ret;
 300         unsigned int lcore_id, master_lcore_id, last_lcore_id;
 301
 302         uint16_t port_id;
 303
 304         rte_log_set_global_level(RTE_LOG_INFO);
 305
 306         ret = rte_eal_init(argc, argv);
 307         if (ret < 0)
 308                 rte_exit(EXIT_FAILURE, "Cannot initialize EAL\n");
 309
 310         argc -= ret;
 311         argv += ret;
 312
 313         init_dpdk();
 314         setup_shared_variables();
 315
 316         *quota = 32;
 317         *low_watermark = 60 * RING_SIZE / 100;
 318
 319         last_lcore_id   = get_last_lcore_id();
 320         master_lcore_id = rte_get_master_lcore();
 321
 322         /* Parse the application's arguments */
 323         ret = parse_qw_args(argc, argv);
 324         if (ret < 0)
 325                 rte_exit(EXIT_FAILURE, "Invalid quota/watermark argument(s)\n");
 326
 327         /* Create a pool of mbuf to store packets */
 328         mbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", MBUF_PER_POOL, 32, 0,
 329                         MBUF_DATA_SIZE, rte_socket_id());
 330         if (mbuf_pool == NULL)
 331                 rte_panic("%s\n", rte_strerror(rte_errno));
 332
 333         for (port_id = 0; port_id < RTE_MAX_ETHPORTS; port_id++)
 334                 if (is_bit_set(port_id, portmask)) {
 335                         configure_eth_port(port_id);
 336                         init_ring(master_lcore_id, port_id);
 337                 }
 338
 339         pair_ports();
 340
 341         /*
 342          * Start pipeline_connect() on all the available slave lcores
 343          * but the last
 344          */
 345         for (lcore_id = 0 ; lcore_id < last_lcore_id; lcore_id++) {
 346                 if (rte_lcore_is_enabled(lcore_id) &&
 347                                 lcore_id != master_lcore_id) {
 348
 349                         for (port_id = 0; port_id < RTE_MAX_ETHPORTS; port_id++)
 350                                 if (is_bit_set(port_id, portmask))
 351                                         init_ring(lcore_id, port_id);
 352
 353                         rte_eal_remote_launch(pipeline_stage,
 354                                         NULL, lcore_id);
 355                 }
 356         }
 357
 358         /* Start send_stage() on the last slave core */
 359         rte_eal_remote_launch(send_stage, NULL, last_lcore_id);
 360
 361         /* Start receive_stage() on the master core */
 362         receive_stage(NULL);
 363
 364         return 0;
 365 }