app/test-pmd/noisy_vnf.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Red Hat Corp.
   3  */
   4
   5 #include <stdarg.h>
   6 #include <stdio.h>
   7 #include <stdbool.h>
   8 #include <string.h>
   9 #include <errno.h>
  10 #include <stdint.h>
  11 #include <unistd.h>
  12 #include <inttypes.h>
  13
  14 #include <sys/queue.h>
  15 #include <sys/stat.h>
  16
  17 #include <rte_common.h>
  18 #include <rte_log.h>
  19 #include <rte_debug.h>
  20 #include <rte_cycles.h>
  21 #include <rte_memory.h>
  22 #include <rte_launch.h>
  23 #include <rte_eal.h>
  24 #include <rte_per_lcore.h>
  25 #include <rte_lcore.h>
  26 #include <rte_memcpy.h>
  27 #include <rte_mempool.h>
  28 #include <rte_mbuf.h>
  29 #include <rte_ethdev.h>
  30 #include <rte_flow.h>
  31 #include <rte_malloc.h>
  32
  33 #include "testpmd.h"
  34
  35 struct noisy_config {
  36         struct rte_ring *f;
  37         uint64_t prev_time;
  38         char *vnf_mem;
  39         bool do_buffering;
  40         bool do_flush;
  41         bool do_sim;
  42 };
  43
  44 struct noisy_config *noisy_cfg[RTE_MAX_ETHPORTS];
  45
  46 static inline void
  47 do_write(char *vnf_mem)
  48 {
  49         uint64_t i = rte_rand();
  50         uint64_t w = rte_rand();
  51
  52         vnf_mem[i % ((noisy_lkup_mem_sz * 1024 * 1024) /
  53                         RTE_CACHE_LINE_SIZE)] = w;
  54 }
  55
  56 static inline void
  57 do_read(char *vnf_mem)
  58 {
  59         uint64_t i = rte_rand();
  60         uint64_t r;
  61
  62         r = vnf_mem[i % ((noisy_lkup_mem_sz * 1024 * 1024) /
  63                         RTE_CACHE_LINE_SIZE)];
  64         r++;
  65 }
  66
  67 static inline void
  68 do_readwrite(char *vnf_mem)
  69 {
  70         do_read(vnf_mem);
  71         do_write(vnf_mem);
  72 }
  73
  74 /*
  75  * Simulate route lookups as defined by commandline parameters
  76  */
  77 static void
  78 sim_memory_lookups(struct noisy_config *ncf, uint16_t nb_pkts)
  79 {
  80         uint16_t i, j;
  81
  82         if (!ncf->do_sim)
  83                 return;
  84
  85         for (i = 0; i < nb_pkts; i++) {
  86                 for (j = 0; j < noisy_lkup_num_writes; j++)
  87                         do_write(ncf->vnf_mem);
  88                 for (j = 0; j < noisy_lkup_num_reads; j++)
  89                         do_read(ncf->vnf_mem);
  90                 for (j = 0; j < noisy_lkup_num_reads_writes; j++)
  91                         do_readwrite(ncf->vnf_mem);
  92         }
  93 }
  94
  95 static uint16_t
  96 do_retry(uint16_t nb_rx, uint16_t nb_tx, struct rte_mbuf **pkts,
  97          struct fwd_stream *fs)
  98 {
  99         uint32_t retry = 0;
 100
 101         while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
 102                 rte_delay_us(burst_tx_delay_time);
 103                 nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 104                                 &pkts[nb_tx], nb_rx - nb_tx);
 105         }
 106
 107         return nb_tx;
 108 }
 109
 110 static uint32_t
 111 drop_pkts(struct rte_mbuf **pkts, uint16_t nb_rx, uint16_t nb_tx)
 112 {
 113         if (nb_tx < nb_rx) {
 114                 do {
 115                         rte_pktmbuf_free(pkts[nb_tx]);
 116                 } while (++nb_tx < nb_rx);
 117         }
 118
 119         return nb_rx - nb_tx;
 120 }
 121
 122 /*
 123  * Forwarding of packets in noisy VNF mode.  Forward packets but perform
 124  * memory operations first as specified on cmdline.
 125  *
 126  * Depending on which commandline parameters are specified we have
 127  * different cases to handle:
 128  *
 129  * 1. No FIFO size was given, so we don't do buffering of incoming
 130  *    packets.  This case is pretty much what iofwd does but in this case
 131  *    we also do simulation of memory accesses (depending on which
 132  *    parameters were specified for it).
 133  * 2. User wants do buffer packets in a FIFO and sent out overflowing
 134  *    packets.
 135  * 3. User wants a FIFO and specifies a time in ms to flush all packets
 136  *    out of the FIFO
 137  * 4. Cases 2 and 3 combined
 138  */
 139 static void
 140 pkt_burst_noisy_vnf(struct fwd_stream *fs)
 141 {
 142         const uint64_t freq_khz = rte_get_timer_hz() / 1000;
 143         struct noisy_config *ncf = noisy_cfg[fs->rx_port];
 144         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 145         struct rte_mbuf *tmp_pkts[MAX_PKT_BURST];
 146         uint16_t nb_deqd = 0;
 147         uint16_t nb_rx = 0;
 148         uint16_t nb_tx = 0;
 149         uint16_t nb_enqd;
 150         unsigned int fifo_free;
 151         uint64_t delta_ms;
 152         bool needs_flush = false;
 153         uint64_t now;
 154
 155         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue,
 156                         pkts_burst, nb_pkt_per_burst);
 157         if (unlikely(nb_rx == 0))
 158                 goto flush;
 159         fs->rx_packets += nb_rx;
 160
 161         if (!ncf->do_buffering) {
 162                 sim_memory_lookups(ncf, nb_rx);
 163                 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 164                                 pkts_burst, nb_rx);
 165                 if (unlikely(nb_tx < nb_rx) && fs->retry_enabled)
 166                         nb_tx += do_retry(nb_rx, nb_tx, pkts_burst, fs);
 167                 fs->tx_packets += nb_tx;
 168                 fs->fwd_dropped += drop_pkts(pkts_burst, nb_rx, nb_tx);
 169                 return;
 170         }
 171
 172         fifo_free = rte_ring_free_count(ncf->f);
 173         if (fifo_free >= nb_rx) {
 174                 nb_enqd = rte_ring_enqueue_burst(ncf->f,
 175                                 (void **) pkts_burst, nb_rx, NULL);
 176                 if (nb_enqd < nb_rx)
 177                         fs->fwd_dropped += drop_pkts(pkts_burst,
 178                                                      nb_rx, nb_enqd);
 179         } else {
 180                 nb_deqd = rte_ring_dequeue_burst(ncf->f,
 181                                 (void **) tmp_pkts, nb_rx, NULL);
 182                 nb_enqd = rte_ring_enqueue_burst(ncf->f,
 183                                 (void **) pkts_burst, nb_deqd, NULL);
 184                 if (nb_deqd > 0) {
 185                         nb_tx = rte_eth_tx_burst(fs->tx_port,
 186                                         fs->tx_queue, tmp_pkts,
 187                                         nb_deqd);
 188                         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled)
 189                                 nb_tx += do_retry(nb_rx, nb_tx, tmp_pkts, fs);
 190                         fs->fwd_dropped += drop_pkts(tmp_pkts, nb_deqd, nb_tx);
 191                 }
 192         }
 193
 194         sim_memory_lookups(ncf, nb_enqd);
 195
 196 flush:
 197         if (ncf->do_flush) {
 198                 if (!ncf->prev_time)
 199                         now = ncf->prev_time = rte_get_timer_cycles();
 200                 else
 201                         now = rte_get_timer_cycles();
 202                 delta_ms = (now - ncf->prev_time) / freq_khz;
 203                 needs_flush = delta_ms >= noisy_tx_sw_buf_flush_time &&
 204                                 noisy_tx_sw_buf_flush_time > 0 && !nb_tx;
 205         }
 206         while (needs_flush && !rte_ring_empty(ncf->f)) {
 207                 unsigned int sent;
 208                 nb_deqd = rte_ring_dequeue_burst(ncf->f, (void **)tmp_pkts,
 209                                 MAX_PKT_BURST, NULL);
 210                 sent = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 211                                          tmp_pkts, nb_deqd);
 212                 if (unlikely(sent < nb_deqd) && fs->retry_enabled)
 213                         nb_tx += do_retry(nb_rx, nb_tx, tmp_pkts, fs);
 214                 fs->fwd_dropped += drop_pkts(tmp_pkts, nb_deqd, sent);
 215                 ncf->prev_time = rte_get_timer_cycles();
 216         }
 217 }
 218
 219 #define NOISY_STRSIZE 256
 220 #define NOISY_RING "noisy_ring_%d\n"
 221
 222 static void
 223 noisy_fwd_end(portid_t pi)
 224 {
 225         rte_ring_free(noisy_cfg[pi]->f);
 226         rte_free(noisy_cfg[pi]->vnf_mem);
 227         rte_free(noisy_cfg[pi]);
 228 }
 229
 230 static void
 231 noisy_fwd_begin(portid_t pi)
 232 {
 233         struct noisy_config *n;
 234         char name[NOISY_STRSIZE];
 235
 236         noisy_cfg[pi] = rte_zmalloc("testpmd noisy fifo and timers",
 237                                 sizeof(struct noisy_config),
 238                                 RTE_CACHE_LINE_SIZE);
 239         if (noisy_cfg[pi] == NULL) {
 240                 rte_exit(EXIT_FAILURE,
 241                          "rte_zmalloc(%d) struct noisy_config) failed\n",
 242                          (int) pi);
 243         }
 244         n = noisy_cfg[pi];
 245         n->do_buffering = noisy_tx_sw_bufsz > 0;
 246         n->do_sim = noisy_lkup_num_writes + noisy_lkup_num_reads +
 247                     noisy_lkup_num_reads_writes;
 248         n->do_flush = noisy_tx_sw_buf_flush_time > 0;
 249
 250         if (n->do_buffering) {
 251                 snprintf(name, NOISY_STRSIZE, NOISY_RING, pi);
 252                 n->f = rte_ring_create(name, noisy_tx_sw_bufsz,
 253                                 rte_socket_id(), 0);
 254                 if (!n->f)
 255                         rte_exit(EXIT_FAILURE,
 256                                  "rte_ring_create(%d), size %d) failed\n",
 257                                  (int) pi,
 258                                  noisy_tx_sw_bufsz);
 259         }
 260         if (noisy_lkup_mem_sz > 0) {
 261                 n->vnf_mem = (char *) rte_zmalloc("vnf sim memory",
 262                                  noisy_lkup_mem_sz * 1024 * 1024,
 263                                  RTE_CACHE_LINE_SIZE);
 264                 if (!n->vnf_mem)
 265                         rte_exit(EXIT_FAILURE,
 266                            "rte_zmalloc(%" PRIu64 ") for vnf memory) failed\n",
 267                            noisy_lkup_mem_sz);
 268         } else if (n->do_sim) {
 269                 rte_exit(EXIT_FAILURE,
 270                          "--noisy-lkup-memory-size must be > 0\n");
 271         }
 272 }
 273
 274 struct fwd_engine noisy_vnf_engine = {
 275         .fwd_mode_name  = "noisy",
 276         .port_fwd_begin = noisy_fwd_begin,
 277         .port_fwd_end   = noisy_fwd_end,
 278         .packet_fwd     = pkt_burst_noisy_vnf,
 279 };