The l2reflect application implements a ping-pong benchmark to
measure the latency between two instances. For communication,
we use raw ethernet and send one packet at a time. The timing data
is collected locally and min/max/avg values are displayed in a TUI.
Finally, a histogram of the latencies is printed which can be
further processed with the jitterdebugger visualization scripts.
To debug latency spikes, a max threshold can be defined.
If it is hit, a trace point is created on both instances.
Signed-off-by: Felix Moessbauer <felix.moessba...@siemens.com>
Signed-off-by: Henning Schild <henning.sch...@siemens.com>
---
app/Makefile | 1 +
app/l2reflect/Makefile | 14 +
app/l2reflect/l2reflect.h | 62 +++
app/l2reflect/main.c | 857 ++++++++++++++++++++++++++++++++++++++
app/l2reflect/meson.build | 22 +
app/l2reflect/stats.c | 201 +++++++++
app/l2reflect/stats.h | 67 +++
app/meson.build | 1 +
8 files changed, 1225 insertions(+)
create mode 100644 app/l2reflect/Makefile
create mode 100644 app/l2reflect/l2reflect.h
create mode 100644 app/l2reflect/main.c
create mode 100644 app/l2reflect/meson.build
create mode 100644 app/l2reflect/stats.c
create mode 100644 app/l2reflect/stats.h
diff --git a/app/Makefile b/app/Makefile
index 0392a7de0..43563ef0e 100644
--- a/app/Makefile
+++ b/app/Makefile
@@ -7,6 +7,7 @@ DIRS-$(CONFIG_RTE_APP_TEST) += test
DIRS-$(CONFIG_RTE_TEST_PMD) += test-pmd
DIRS-$(CONFIG_RTE_PROC_INFO) += proc-info
DIRS-$(CONFIG_RTE_LIBRTE_PDUMP) += pdump
+DIRS-$(CONFIG_RTE_LIBRTE_L2REFLECT) += l2reflect
DIRS-$(CONFIG_RTE_LIBRTE_ACL) += test-acl
DIRS-$(CONFIG_RTE_LIBRTE_CMDLINE) += test-cmdline
DIRS-$(CONFIG_RTE_LIBRTE_FIB) += test-fib
diff --git a/app/l2reflect/Makefile b/app/l2reflect/Makefile
new file mode 100644
index 000000000..4e844e35d
--- /dev/null
+++ b/app/l2reflect/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2020 Siemens AG
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+APP = l2reflect
+
+CFLAGS += $(WERROR_FLAGS)
+
+# all source are stored in SRCS-y
+
+SRCS-y := main.c stats.c
+
+include $(RTE_SDK)/mk/rte.app.mk
diff --git a/app/l2reflect/l2reflect.h b/app/l2reflect/l2reflect.h
new file mode 100644
index 000000000..372dfb1f2
--- /dev/null
+++ b/app/l2reflect/l2reflect.h
@@ -0,0 +1,62 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Siemens AG
+ *
+ * authors:
+ * Felix Moessbauer <felix.moessba...@siemens.com>
+ * Henning Schild <henning.sch...@siemens.com>
+ */
+#ifndef _L2REFLECT_H_
+#define _L2REFLECT_H_
+#define MAGIC_TRACE_PAYLOAD 0xd00faffeaffed00full
+/* IEEE Std 802 - Local Experimental Ethertype */
+#define ETHER_TYPE_L2REFLECT 0x88B5
+/* Used to compare MAC addresses. */
+#define MAC_ADDR_CMP 0xFFFFFFFFFFFFull
+
+enum {
+ TRACE_TYPE_DATA,
+ TRACE_TYPE_HELO,
+ TRACE_TYPE_EHLO,
+ TRACE_TYPE_RSET,
+ TRACE_TYPE_QUIT,
+};
+
+struct my_magic_packet {
+ struct rte_ether_hdr eth;
+ uint8_t type;
+ uint64_t magic;
+ uint64_t breakval;
+};
+
+enum STATE {
+ /* elect the initial sender */
+ S_ELECT_LEADER = 1,
+ /* reset the counters */
+ S_RESET_TRX = 2,
+ /* measurement S_RUNNING */
+ S_RUNNING = 4,
+ /* terminated by local event */
+ S_LOCAL_TERM = 8,
+ /* terminated by remote event */
+ S_REMOTE_TERM = 16
+};
+
+int l2reflect_hist;
+atomic_int l2reflect_output_hist;
+uint64_t l2reflect_sleep_msec;
+uint16_t l2reflect_port_number;
+atomic_int l2reflect_state;
+struct rte_ether_addr l2reflect_port_eth_addr;
+struct rte_ether_addr l2reflect_remote_eth_addr;
+
+/*
+ * Compares a packet destination MAC address to a device MAC address.
+ */
+static __rte_always_inline int
+ether_addr_cmp(struct rte_ether_addr *ea, struct rte_ether_addr *eb)
+{
+ return ((*(uint64_t *)ea ^ *(uint64_t *)eb) & MAC_ADDR_CMP) == 0;
+}
+
+#endif /* _L2REFLECT_H_ */
diff --git a/app/l2reflect/main.c b/app/l2reflect/main.c
new file mode 100644
index 000000000..2cf93cdec
--- /dev/null
+++ b/app/l2reflect/main.c
@@ -0,0 +1,857 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Siemens AG
+ *
+ * authors:
+ * Felix Moessbauer <felix.moessba...@siemens.com>
+ * Henning Schild <henning.sch...@siemens.com>
+ *
+ * launch (non-rt kernel): l2reflect --lcores 0@0,1@6 -n 1
+ * launch (rt kernel): l2reflect --lcores 0@0,1@6 -n 1 -- -P 50 -r -l
+ *
+ * The l2reflect application implements a ping-pong benchmark to
+ * measure the latency between two instances. For communication,
+ * we use raw ethernet and send one packet at a time. The timing data
+ * is collected locally and min/max/avg values are displayed in a TUI.
+ * Finally, a histogram of the latencies is printed which can be
+ * further processed with the jitterdebugger visualization scripts.
+ * To debug latency spikes, a max threshold can be defined.
+ * If it is hit, a trace point is created on both instances.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <getopt.h>
+#include <sys/signal.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/io.h>
+#include <sched.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdatomic.h>
+
+#include <rte_common.h>
+#include <rte_errno.h>
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memcpy.h>
+#include <rte_memzone.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_launch.h>
+#include <rte_atomic.h>
+#include <rte_cycles.h>
+#include <rte_prefetch.h>
+#include <rte_lcore.h>
+#include <rte_per_lcore.h>
+#include <rte_branch_prediction.h>
+#include <rte_interrupts.h>
+#include <rte_random.h>
+#include <rte_debug.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_ring.h>
+#include <rte_mempool.h>
+#include <rte_mbuf.h>
+
+#include "l2reflect.h"
+#include "stats.h"
+
+#define RTE_LOGTYPE_L2REFLECT RTE_LOGTYPE_USER1
+
+#define NSEC_PER_SEC 1000000000
+
+#define MBUF_SIZE (2048 + sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM)
+#define NB_MBUF 2047
+
+#define MAX_PKT_BURST 32
+/* warmup a few round before starting the measurement */
+#define WARMUP_ROUNDS 42
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+
+static struct timespec last_sent, last_recv;
+static int quiet, disable_int, priority, policy, l2reflect_mlock,
+ l2reflect_interrupt, trace_fd;
+
+static atomic_int sleep_start;
+
+static uint64_t rounds;
+static int quiet, disable_int, priority, policy, l2reflect_mlock,
+ l2reflect_interrupt, trace_fd;
+
+/* Configurable number of RX/TX ring descriptors */
+#define RTE_TEST_RX_DESC_DEFAULT 128
+#define RTE_TEST_TX_DESC_DEFAULT 512
+static uint16_t nb_rxd = RTE_TEST_RX_DESC_DEFAULT;
+static uint16_t nb_txd = RTE_TEST_TX_DESC_DEFAULT;
+
+static struct rte_eth_conf port_conf = {
+ .rxmode = {
+ .split_hdr_size = 0,
+ },
+ .txmode = {
+ .mq_mode = ETH_MQ_TX_NONE,
+ },
+};
+
+static uint32_t l2reflect_q;
+static uint64_t l2reflect_break_usec = UINT64_MAX;
+static uint64_t l2reflect_break_usec;
+
+static struct rte_ether_addr ether_bcast_addr = {
+ .addr_bytes = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }
+};
+
+struct rte_mempool *l2reflect_pktmbuf_pool;
+
+static void
+l2reflect_usage(const char *prgname)
+{
+ printf("%s [EAL options] -- [-p PORT] -P [PRIO] [-b USEC] [-r] [-f]
[-l]"
+ "[-s] [-q] [-d] [-S] [-i MSEC]\n"
+ " -p PORT: port to configure\n"
+ " -P PRIO: scheduling priority to use\n"
+ " -b USEC: break when latency > USEC\n"
+ " -r: scheduling policy SCHED_RR\n"
+ " -f: scheduling policy SCHED_FIFO\n"
+ " -l: lock memory (mlockall)\n"
+ " -s: send one packet on startup\n"
+ " -q: quiet, do not print stats\n"
+ " -d: die die die cli\n"
+ " -H USEC: create histogram of latencies with USEC time
slices\n"
+ " -F FILE: write histogram to file\n"
+ " -S: start processing threads in sleep, wake with SIGUSR2\n"
+ " -i MSEC: use interrupts instead of polling (cont. on
interrupt or after MSEC)\n",
+ prgname);
+}
+
+/* Parse the argument given in the command line of the application */
+static int
+l2reflect_parse_args(int argc, char **argv)
+{
+ int opt, ret;
+ char **argvopt;
+ int option_index;
+ char *prgname = argv[0];
+ static struct option lgopts[] = { { NULL, 0, 0, 0 } };
+
+ argvopt = argv;
+ policy = SCHED_OTHER;
+ hist_filename = NULL;
+ l2reflect_output_hist = 0;
+
+ while ((opt = getopt_long(argc, argvopt, "p:P:b:H:F:i:sqdrflS", lgopts,
+ &option_index)) != EOF) {
+ switch (opt) {
+ /* port */
+ case 'p':
+ l2reflect_port_number =
+ (uint16_t)strtoul(optarg, NULL, 10);
+ break;
+ case 'P':
+ priority = strtoul(optarg, NULL, 10);
+ if (priority > 0) {
+ if (policy == SCHED_OTHER)
+ policy = SCHED_RR;
+ l2reflect_mlock = 1;
+ }
+ break;
+ case 'b':
+ l2reflect_break_usec = strtoul(optarg, NULL, 10);
+ break;
+ case 'S':
+ sleep_start = 1;
+ break;
+ case 'q':
+ quiet = 1;
+ break;
+ case 'd':
+ disable_int = 1;
+ break;
+ case 'r':
+ policy = SCHED_RR;
+ break;
+ case 'f':
+ policy = SCHED_FIFO;
+ break;
+ case 'l':
+ l2reflect_mlock = 1;
+ break;
+ case 'H':
+ l2reflect_hist = 1;
+ hist_bucket_usec = strtoul(optarg, NULL, 10);
+#ifndef RTE_HAS_CJSON
+ printf("not compiled with cjson support\n");
+ return -1;
+#endif
+ break;
+ case 'F':
+ hist_filename = strndup(optarg, 128);
+ break;
+ case 'i':
+ l2reflect_interrupt = 1;
+ l2reflect_sleep_msec = strtoul(optarg, NULL, 10);
+ break;
+ default:
+ l2reflect_usage(prgname);
+ return -1;
+ }
+ }
+
+ if (optind >= 0)
+ argv[optind - 1] = prgname;
+
+ if (hist_filename && !l2reflect_hist) {
+ printf("-F switch requires -H switch as well\n");
+ return -1;
+ }
+
+ ret = optind - 1;
+ optind = 0; /* reset getopt lib */
+ return ret;
+}
+
+__rte_format_printf(1, 0)
+static void
+trace_write(const char *fmt, ...)
+{
+ va_list ap;
+ char buf[256];
+ int n, err;
+
+ if (trace_fd == 0)
+ trace_fd = open("/sys/kernel/debug/tracing/trace_marker",
+ O_WRONLY);
+ if (trace_fd < 0)
+ return;
+
+ va_start(ap, fmt);
+ n = vsnprintf(buf, 256, fmt, ap);
+ va_end(ap);
+
+ err = write(trace_fd, buf, n);
+ assert(err >= 1);
+}
+
+/* Send a burst of one packet */
+static int
+l2reflect_send_packet(struct rte_mbuf **m, uint16_t port)
+{
+ unsigned int ret;
+ struct rte_ether_hdr *eth;
+ struct my_magic_packet *pkt;
+ uint16_t type;
+
+ eth = rte_pktmbuf_mtod(*m, struct rte_ether_hdr *);
+ pkt = (struct my_magic_packet *)eth;
+ type = pkt->type;
+
+ ret = rte_eth_tx_burst(port, l2reflect_q, m, 1);
+ if (unlikely(ret < 1)) {
+ rte_pktmbuf_free(*m);
+ } else {
+ if (type == TRACE_TYPE_DATA) {
+ clock_gettime(CLOCK_MONOTONIC, &last_sent);
+ l2reflect_state = S_RUNNING;
+ }
+ }
+ return 0;
+}
+
+static void
+l2reflect_simple_forward(struct rte_mbuf *m)
+{
+ struct rte_ether_hdr *eth;
+ struct my_magic_packet *pkt;
+
+ eth = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
+ pkt = (struct my_magic_packet *)eth;
+
+ /* dst addr */
+ rte_ether_addr_copy(ð->s_addr, ð->d_addr);
+ /* src addr */
+ rte_ether_addr_copy(&l2reflect_port_eth_addr, ð->s_addr);
+
+ if ((eth->ether_type == rte_cpu_to_be_16(ETHER_TYPE_L2REFLECT)) &&
+ (pkt->magic == MAGIC_TRACE_PAYLOAD)) {
+ /* and the native one */
+ trace_write("sending traced packet\n");
+ }
+
+ l2reflect_send_packet(&m, l2reflect_port_number);
+}
+
+static struct rte_mbuf *
+l2reflect_new_pkt(unsigned int type)
+{
+ struct rte_mbuf *m;
+ struct rte_ether_hdr *eth;
+ struct my_magic_packet *pkt;
+
+ m = rte_pktmbuf_alloc(l2reflect_pktmbuf_pool);
+ if (m == NULL)
+ rte_exit(EXIT_FAILURE, "rte_pktmbuf_alloc failed\n");
+
+ eth = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
+
+ if (l2reflect_state != S_ELECT_LEADER)
+ rte_ether_addr_copy(&l2reflect_remote_eth_addr, ð->d_addr);
+ else
+ rte_ether_addr_copy(ðer_bcast_addr, ð->d_addr);
+
+ /* src addr */
+ rte_ether_addr_copy(&l2reflect_port_eth_addr, ð->s_addr);
+ eth->ether_type = rte_cpu_to_be_16(ETHER_TYPE_L2REFLECT);
+
+ m->data_len = 64;
+ m->nb_segs = 1;
+ m->pkt_len = 64;
+ m->l2_len = sizeof(struct rte_ether_hdr);
+
+ pkt = (struct my_magic_packet *)eth;
+ pkt->type = type;
+ pkt->breakval = l2reflect_break_usec;
+
+ return m;
+}
+
+static void
+l2reflect_send_reset(void)
+{
+ struct rte_mbuf *m;
+ m = l2reflect_new_pkt(TRACE_TYPE_RSET);
+ l2reflect_send_packet(&m, l2reflect_port_number);
+}
+
+static void
+l2reflect_send_quit(void)
+{
+ struct rte_mbuf *m;
+ m = l2reflect_new_pkt(TRACE_TYPE_QUIT);
+ l2reflect_send_packet(&m, l2reflect_port_number);
+}
+
+static void
+l2reflect_new_ball(void)
+{
+ struct rte_mbuf *pnewball;
+ struct rte_ether_hdr *eth;
+ struct my_magic_packet *pkt;
+
+ printf("Should create a packet to play with ...\n");
+ pnewball = l2reflect_new_pkt(TRACE_TYPE_DATA);
+
+ eth = rte_pktmbuf_mtod(pnewball, struct rte_ether_hdr *);
+
+ printf("from MAC address: %02X:%02X:%02X:%02X:%02X:%02X to"
+ " %02X:%02X:%02X:%02X:%02X:%02X\n\n",
+ eth->s_addr.addr_bytes[0], eth->s_addr.addr_bytes[1],
+ eth->s_addr.addr_bytes[2], eth->s_addr.addr_bytes[3],
+ eth->s_addr.addr_bytes[4], eth->s_addr.addr_bytes[5],
+ eth->d_addr.addr_bytes[0], eth->d_addr.addr_bytes[1],
+ eth->d_addr.addr_bytes[2], eth->d_addr.addr_bytes[3],
+ eth->d_addr.addr_bytes[4], eth->d_addr.addr_bytes[5]);
+
+ pkt = (struct my_magic_packet *)eth;
+
+ /* we are tracing lets tell the others */
+ if (l2reflect_break_usec)
+ pkt->magic = MAGIC_TRACE_PAYLOAD;
+
+ l2reflect_send_packet(&pnewball, l2reflect_port_number);
+}
+
+static inline int64_t
+calcdiff_ns(struct timespec t1, struct timespec t2)
+{
+ int64_t diff;
+ diff = NSEC_PER_SEC * (int64_t)((int)t1.tv_sec - (int)t2.tv_sec);
+ diff += ((int)t1.tv_nsec - (int)t2.tv_nsec);
+ return diff;
+}
+
+static inline unsigned int
+l2reflect_rx_filter(
+ struct rte_mbuf **bufs,
+ unsigned int nb_rx,
+ unsigned int data_only)
+{
+ struct rte_ether_hdr *eth;
+ struct my_magic_packet *pkt;
+ unsigned int i, ret;
+
+ ret = 0;
+ for (i = 0; i < nb_rx; i++) {
+ eth = rte_pktmbuf_mtod(bufs[i], struct rte_ether_hdr *);
+ if (l2reflect_state != S_ELECT_LEADER &&
+ !ether_addr_cmp(ð->s_addr, &l2reflect_remote_eth_addr))
+ goto drop;
+
+ if (eth->ether_type != rte_cpu_to_be_16(ETHER_TYPE_L2REFLECT))
+ goto drop;
+
+ pkt = (struct my_magic_packet *)eth;
+ if (data_only && (pkt->type != TRACE_TYPE_DATA &&
+ pkt->type != TRACE_TYPE_RSET &&
+ pkt->type != TRACE_TYPE_QUIT))
+ goto drop;
+
+ bufs[ret++] = bufs[i];
+ continue;
+drop:
+ rte_pktmbuf_free(bufs[i]);
+ }
+
+ return ret;
+}
+
+static int
+elect_leader(uint16_t portid)
+{
+ struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
+ struct rte_mbuf *m;
+ struct rte_ether_hdr *eth;
+ struct my_magic_packet *pkt;
+ uint64_t my_mac, other_mac, breakval;
+ unsigned int i, nb_rx;
+ int i_win;
+ int searching = 1;
+
+ other_mac = 0ULL;
+ my_mac = 0ULL;
+ breakval = 0;
+
+ while (l2reflect_state == S_ELECT_LEADER) {
+ nb_rx = rte_eth_rx_burst(portid, l2reflect_q, pkts_burst,
+ MAX_PKT_BURST);
+ nb_rx = l2reflect_rx_filter(pkts_burst, nb_rx, 0);
+ for (i = 0; i < nb_rx && searching; i++) {
+ eth = rte_pktmbuf_mtod(pkts_burst[i],
+ struct rte_ether_hdr *);
+ pkt = (struct my_magic_packet *)eth;
+ if (pkt->type == TRACE_TYPE_HELO ||
+ pkt->type == TRACE_TYPE_EHLO) {
+ l2reflect_state = S_RUNNING;
+ rte_ether_addr_copy(ð->s_addr,
+ &l2reflect_remote_eth_addr);
+ rte_ether_addr_copy(
+ ð->s_addr,
+ (struct rte_ether_addr *)&other_mac);
+ rte_ether_addr_copy(
+ &l2reflect_port_eth_addr,
+ (struct rte_ether_addr *)&my_mac);
+ breakval = pkt->breakval;
+ /* break, but cleanup */
+ searching = 0;
+ }
+ if (pkt->type == TRACE_TYPE_HELO) {
+ m = l2reflect_new_pkt(TRACE_TYPE_EHLO);
+ RTE_LOG(INFO, L2REFLECT, "found one EHLO\n");
+ l2reflect_send_packet(&m,
+ l2reflect_port_number);
+ }
+ rte_pktmbuf_free(pkts_burst[i]);
+ }
+ m = l2reflect_new_pkt(TRACE_TYPE_HELO);
+ RTE_LOG(INFO, L2REFLECT, "looking for player HELO\n");
+ l2reflect_send_packet(&m, l2reflect_port_number);
+ usleep(500000);
+ }
+ /* leave election logic */
+ if (l2reflect_state != S_RUNNING)
+ return 0;
+
+ if (my_mac == other_mac)
+ rte_exit(EXIT_FAILURE, "talking to myself ... confused\n");
+
+ /* the one with the bigger MAC is the leader */
+ i_win = (my_mac > other_mac);
+
+ RTE_LOG(INFO, L2REFLECT, "i am the \"%s\"\n", i_win ? "rick" : "morty");
+
+ /* looser takes tracing break value from winner */
+ if (!i_win)
+ l2reflect_break_usec = breakval;
+
+ return i_win;
+}
+
+/*
+ * add the measured time diff to the statistics.
+ * return false if threshold is hit
+ */
+static inline bool
+add_to_record(const uint64_t diff)
+{
+ record.rounds++;
+ /* do not count the first rounds, diff would be too high */
+ if (record.rounds > WARMUP_ROUNDS) {
+ if (l2reflect_hist) {
+ const uint64_t bucket =
+ MIN(diff / (hist_bucket_usec * 1000),
+ HIST_CAP_BUCKET);
+ record.hist[bucket]++;
+ }
+
+ record.avg_round += (double)diff;
+ if (diff < record.min_round)
+ record.min_round = diff;
+ if (diff > record.max_round) {
+ record.max_round = diff;
+ if (l2reflect_break_usec &&
+ (record.max_round >
+ l2reflect_break_usec *
+ 1000))
+ return false;
+ }
+ }
+ return true;
+}
+
+/*
+ * process a single packet.
+ * return false if latency threshold is hit
+ */
+static inline bool
+process_packet(
+ struct my_magic_packet *pkt,
+ uint64_t *diff)
+{
+ if (pkt->type == TRACE_TYPE_DATA) {
+ clock_gettime(CLOCK_MONOTONIC, &last_recv);
+ *diff = calcdiff_ns(last_recv, last_sent);
+ if (!add_to_record(*diff))
+ return false;
+ }
+ if (pkt->magic == MAGIC_TRACE_PAYLOAD) {
+ /* and the native one */
+ trace_write("received traced packet\n");
+ }
+ return true;
+}
+
+/* main processing loop */
+static void
+l2reflect_main_loop(void)
+{
+ struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
+ struct rte_mbuf *m;
+ unsigned int lcore_id;
+ unsigned int j, nb_rx, nb_evt;
+ uint16_t portid;
+ uint64_t diff = 0;
+ int sender;
+ struct my_magic_packet *pkt;
+ struct rte_ether_hdr *eth;
+ struct rte_epoll_event event;
+
+ lcore_id = rte_lcore_id();
+
+ RTE_LOG(INFO, L2REFLECT, "entering main loop on lcore %u\n", lcore_id);
+
+ portid = l2reflect_port_number;
+ RTE_LOG(INFO, L2REFLECT, " -- lcoreid=%u portid=%u\n", lcore_id,
+ portid);
+
+restart:
+ init_record();
+ l2reflect_state = S_ELECT_LEADER;
+ sender = elect_leader(portid);
+
+ /* we are the sender so we bring one ball into the game */
+ if (sender)
+ l2reflect_new_ball();
+
+ while (l2reflect_state == S_RUNNING) {
+ if (l2reflect_interrupt) {
+ rte_eth_dev_rx_intr_enable(portid, l2reflect_q);
+ /* wait for interrupt or timeout */
+ nb_evt = rte_epoll_wait(RTE_EPOLL_PER_THREAD, &event, 1,
+ l2reflect_sleep_msec);
+ rte_eth_dev_rx_intr_disable(portid, l2reflect_q);
+ if (nb_evt == 0 && rounds > WARMUP_ROUNDS)
+ ++record.timeouts;
+ }
+
+ nb_rx = rte_eth_rx_burst(portid, l2reflect_q, pkts_burst,
+ MAX_PKT_BURST);
+
+ /* TODO use drivers/hw to filter mac */
+ nb_rx = l2reflect_rx_filter(pkts_burst, nb_rx, 1);
+
+ /* remote is telling us to reset or stop */
+ if (nb_rx) {
+ eth = rte_pktmbuf_mtod(pkts_burst[0],
+ struct rte_ether_hdr *);
+ pkt = (struct my_magic_packet *)eth;
+ if (eth->ether_type ==
+ rte_cpu_to_be_16(ETHER_TYPE_L2REFLECT)) {
+ if (pkt->type == TRACE_TYPE_RSET) {
+ rte_pktmbuf_free(pkts_burst[0]);
+ goto restart;
+ }
+ if (pkt->type == TRACE_TYPE_QUIT) {
+ l2reflect_state = S_REMOTE_TERM;
+ break;
+ }
+ }
+ }
+
+ if (l2reflect_state == S_RUNNING && nb_rx) {
+ eth = rte_pktmbuf_mtod(pkts_burst[0],
+ struct rte_ether_hdr *);
+ pkt = (struct my_magic_packet *)eth;
+ if (eth->ether_type ==
+ rte_cpu_to_be_16(ETHER_TYPE_L2REFLECT)) {
+ if (!process_packet(pkt, &diff))
+ break;
+ }
+ }
+ for (j = 0; j < nb_rx; j++) {
+ m = pkts_burst[j];
+ rte_prefetch0(rte_pktmbuf_mtod(m, void *));
+ l2reflect_simple_forward(m);
+ }
+ }
+ const int state_cpy = l2reflect_state;
+ switch (state_cpy) {
+ case S_RESET_TRX:
+ l2reflect_send_reset();
+ l2reflect_state = S_ELECT_LEADER;
+ case S_ELECT_LEADER:
+ goto restart;
+ }
+
+ if (state_cpy == S_LOCAL_TERM) {
+ l2reflect_send_quit();
+ if (record.max_round > l2reflect_break_usec) {
+ printf("hit latency threshold (%" PRIu64
+ ".%03u > %" PRIu64 ")\n",
+ diff / 1000, (unsigned int)(diff % 1000),
+ l2reflect_break_usec);
+ }
+ } else if (state_cpy == S_REMOTE_TERM) {
+ printf("received message that remote hit threshold (or is
cancelled)\n");
+ }
+}
+
+static int
+l2reflect_launch_one_lcore(__rte_unused void *dummy)
+{
+ struct sched_param param;
+ int err;
+
+ if (sleep_start) {
+ printf("Sleeping and waiting for SIGCONT\n");
+ while (sleep_start)
+ usleep(10000);
+
+ printf("Got SIGCONT, continuing");
+ }
+ if (l2reflect_mlock) {
+ err = mlockall(MCL_CURRENT | MCL_FUTURE);
+ if (err)
+ rte_exit(EXIT_FAILURE, "mlockall failed: %s\n",
+ strerror(errno));
+ }
+ if (priority > 0 || policy != SCHED_OTHER) {
+ memset(¶m, 0, sizeof(param));
+ param.sched_priority = priority;
+ err = sched_setscheduler(0, policy, ¶m);
+ if (err)
+ rte_exit(EXIT_FAILURE,
+ "sched_setscheduler failed: %s\n",
+ strerror(errno));
+ }
+ if (l2reflect_interrupt) {
+ err = rte_eth_dev_rx_intr_ctl_q(l2reflect_port_number,
+ l2reflect_q,
+ RTE_EPOLL_PER_THREAD,
+ RTE_INTR_EVENT_ADD, NULL);
+ if (err)
+ rte_exit(EXIT_FAILURE,
+ "could not register I/O interrupt\n");
+ }
+ l2reflect_main_loop();
+ return 0;
+}
+
+static void
+sig_handler(int signum)
+{
+ switch (signum) {
+ case SIGUSR1:
+ if (l2reflect_state == S_RUNNING)
+ l2reflect_state = S_RESET_TRX;
+ break;
+ case SIGUSR2:
+ l2reflect_output_hist = 1;
+ break;
+ case SIGCONT:
+ sleep_start = 0;
+ break;
+ case SIGHUP:
+ case SIGINT:
+ l2reflect_state = S_LOCAL_TERM;
+ break;
+ }
+}
+
+int
+main(int argc, char **argv)
+{
+ struct rte_eth_dev_info dev_info;
+ int ret;
+ uint32_t i;
+ uint16_t nb_ports;
+ unsigned int lcore_id;
+ struct sigaction action;
+ bzero(&action, sizeof(action));
+ char mempool_name[128];
+
+ action.sa_handler = sig_handler;
+ if (sigaction(SIGHUP, &action, NULL) < 0 ||
+ sigaction(SIGUSR1, &action, NULL) < 0 ||
+ sigaction(SIGUSR2, &action, NULL) < 0 ||
+ sigaction(SIGCONT, &action, NULL) < 0 ||
+ sigaction(SIGINT, &action, NULL) < 0) {
+ rte_exit(EXIT_FAILURE, "Could not register signal handler\n");
+ }
+
+ lcore_id = rte_lcore_id();
+ /* init EAL */
+ ret = rte_eal_init(argc, argv);
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
+ argc -= ret;
+ argv += ret;
+
+ /* parse application arguments (after the EAL ones) */
+ ret = l2reflect_parse_args(argc, argv);
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE, "Invalid L2REFLECT arguments\n");
+
+ snprintf(mempool_name, sizeof(mempool_name), "mbuf_pool_%d", getpid());
+ printf("About to create mempool \"%s\"\n", mempool_name);
+ /* create the mbuf pool */
+ l2reflect_pktmbuf_pool =
+ rte_mempool_create(mempool_name, NB_MBUF, MBUF_SIZE,
+ MAX_PKT_BURST, sizeof(struct rte_pktmbuf_pool_private),
+ rte_pktmbuf_pool_init, NULL,
+ rte_pktmbuf_init, NULL, rte_socket_id(), 0);
+
+ if (l2reflect_pktmbuf_pool == NULL)
+ rte_exit(EXIT_FAILURE,
+ "Cannot init/find mbuf pool name %s\nError: %d %s\n",
+ mempool_name, rte_errno, rte_strerror(rte_errno));
+
+ nb_ports = rte_eth_dev_count_avail();
+ if (nb_ports == 0)
+ rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
+ if (l2reflect_port_number + 1 > nb_ports)
+ rte_exit(EXIT_FAILURE, "Chosen port %d does not exist - bye\n",
+ l2reflect_port_number);
+ printf("We have %d ports and will use port %d\n", nb_ports,
+ l2reflect_port_number);
+
+ rte_eth_dev_info_get(l2reflect_port_number, &dev_info);
+ printf("Initializing port %u... ", l2reflect_port_number);
+ fflush(stdout);
+
+ if (l2reflect_interrupt)
+ port_conf.intr_conf.rxq = 1;
+ ret = rte_eth_dev_configure(l2reflect_port_number, 1, 1, &port_conf);
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE,
+ "Cannot configure device: err=%s, port=%u\n",
+ strerror(-ret), l2reflect_port_number);
+
+ rte_eth_macaddr_get(l2reflect_port_number, &l2reflect_port_eth_addr);
+
+ /* init RX queues */
+ fflush(stdout);
+ for (i = 0; i <= l2reflect_q; i++) {
+ ret = rte_eth_rx_queue_setup(
+ l2reflect_port_number, i, nb_rxd,
+ rte_eth_dev_socket_id(l2reflect_port_number), NULL,
+ l2reflect_pktmbuf_pool);
+ if (ret < 0)
+ rte_exit(
+ EXIT_FAILURE,
+ "rte_eth_rx_queue_setup:err=%s, port=%u q=%u\n",
+ strerror(-ret), l2reflect_port_number, i);
+ }
+
+ /* init one TX queue on each port */
+ fflush(stdout);
+ ret = rte_eth_tx_queue_setup(
+ l2reflect_port_number, 0, nb_txd,
+ rte_eth_dev_socket_id(l2reflect_port_number), NULL);
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE,
+ "rte_eth_tx_queue_setup:err=%s, port=%u\n",
+ strerror(-ret), (unsigned int)l2reflect_port_number);
+
+ /* Start device */
+ ret = rte_eth_dev_start(l2reflect_port_number);
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE, "rte_eth_dev_start:err=%s, port=%u\n",
+ strerror(-ret), (unsigned int)l2reflect_port_number);
+
+ rte_eth_promiscuous_enable(l2reflect_port_number);
+
+ printf("Port %u, MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n\n",
+ (unsigned int)l2reflect_port_number,
+ l2reflect_port_eth_addr.addr_bytes[0],
+ l2reflect_port_eth_addr.addr_bytes[1],
+ l2reflect_port_eth_addr.addr_bytes[2],
+ l2reflect_port_eth_addr.addr_bytes[3],
+ l2reflect_port_eth_addr.addr_bytes[4],
+ l2reflect_port_eth_addr.addr_bytes[5]);
+
+ /*
+ * in quiet mode the master executes the main packet loop
+ * otherwise the one slave does it and the master prints stats
+ */
+ if (quiet) {
+ assert(rte_lcore_count() == 1);
+ if (disable_int) {
+ iopl(3);
+ asm("cli");
+ }
+ l2reflect_launch_one_lcore(NULL);
+ } else {
+ assert(rte_lcore_count() == 2);
+ /* the slave reflects the packets */
+ RTE_LCORE_FOREACH_SLAVE(lcore_id)
+ {
+ rte_eal_remote_launch(l2reflect_launch_one_lcore, NULL,
+ lcore_id);
+ }
+
+ /* the master prints the stats */
+ init_record();
+ l2reflect_stats_loop();
+ rte_eal_mp_wait_lcore();
+ }
+ rte_eal_cleanup();
+
+ if (l2reflect_hist)
+ output_histogram_snapshot();
+
+ cleanup_record();
+
+ if (trace_fd)
+ close(trace_fd);
+
+ return 0;
+}
diff --git a/app/l2reflect/meson.build b/app/l2reflect/meson.build
new file mode 100644
index 000000000..1d39c3b7e
--- /dev/null
+++ b/app/l2reflect/meson.build
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2020 Siemens AG
+
+# meson file, for building this example as part of a main DPDK build.
+
+cjson = dependency('libcjson', required: false)
+
+if not cjson.found()
+ cc = meson.get_compiler('c')
+ cjson = cc.find_library('cjson', required: false)
+endif
+
+if not is_linux
+ build = false
+endif
+
+sources = files('main.c', 'stats.c')
+deps += ['ethdev']
+if cjson.found()
+ ext_deps += cjson
+ cflags += '-DRTE_HAS_CJSON'
+endif
diff --git a/app/l2reflect/stats.c b/app/l2reflect/stats.c
new file mode 100644
index 000000000..62ff44b27
--- /dev/null
+++ b/app/l2reflect/stats.c
@@ -0,0 +1,201 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Siemens AG
+ *
+ * authors:
+ * Felix Moessbauer <felix.moessba...@siemens.com>
+ * Henning Schild <henning.sch...@siemens.com>
+ */
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+#ifdef RTE_HAS_CJSON
+#include <cjson/cJSON.h>
+#endif
+#include "stats.h"
+
+#define ANSI_BOLD_RED "\x1b[01;31m"
+#define ANSI_BOLD_GREEN "\x1b[01;32m"
+#define ANSI_BOLD_YELLOW "\x1b[01;33m"
+#define ANSI_BOLD_BLUE "\x1b[01;34m"
+#define ANSI_BOLD_MAGENTA "\x1b[01;35m"
+#define ANSI_BOLD_CYAN "\x1b[01;36m"
+#define ANSI_RESET "\x1b[0m"
+
+void
+init_record(void)
+{
+ record.max_round = 0;
+ record.min_round = MIN_INITIAL;
+ record.rounds = 0;
+ record.timeouts = 0;
+ record.avg_round = 0;
+ if (l2reflect_hist) {
+ if (!record.hist_size) {
+ record.hist =
+ calloc(HIST_NUM_BUCKETS, sizeof(uint64_t));
+ record.hist_size = HIST_NUM_BUCKETS;
+ } else {
+ memset(record.hist, 0,
+ record.hist_size * sizeof(uint64_t));
+ }
+ }
+}
+
+void
+cleanup_record(void)
+{
+ if (l2reflect_hist) {
+ free(record.hist);
+ record.hist = NULL;
+ record.hist_size = 0;
+ }
+}
+
+void
+output_histogram_snapshot(void)
+{
+ char *json = serialize_histogram(&record);
+ FILE *fd = stdout;
+ if (hist_filename)
+ fd = fopen(hist_filename, "w");
+ fputs(json, fd);
+ fputs("\n", fd);
+ free(json);
+ if (hist_filename)
+ fclose(fd);
+}
+
+void
+print_stats(void)
+{
+ const char clr[] = { 27, '[', '2', 'J', '\0' };
+ const char topLeft[] = { 27, '[', '1', ';', '1', 'H', '\0' };
+ const uint64_t bytes_in_gib = 0x40000000;
+ struct rte_eth_stats stats;
+
+ rte_eth_stats_get(l2reflect_port_number, &stats);
+
+ /* Clear screen and move to top left */
+ printf("%s%s", clr, topLeft);
+
+ printf(ANSI_BOLD_GREEN "Networking Roundtrip Test\n"
+ ANSI_RESET);
+ printf(ANSI_BOLD_MAGENTA
+ "\nPort statistics ===================================="
+ ANSI_RESET);
+
+ printf("\nMe: %02X:%02X:%02X:%02X:%02X:%02X <--> "
+ "Remote: %02X:%02X:%02X:%02X:%02X:%02X",
+ l2reflect_port_eth_addr.addr_bytes[0],
+ l2reflect_port_eth_addr.addr_bytes[1],
+ l2reflect_port_eth_addr.addr_bytes[2],
+ l2reflect_port_eth_addr.addr_bytes[3],
+ l2reflect_port_eth_addr.addr_bytes[4],
+ l2reflect_port_eth_addr.addr_bytes[5],
+ l2reflect_remote_eth_addr.addr_bytes[0],
+ l2reflect_remote_eth_addr.addr_bytes[1],
+ l2reflect_remote_eth_addr.addr_bytes[2],
+ l2reflect_remote_eth_addr.addr_bytes[3],
+ l2reflect_remote_eth_addr.addr_bytes[4],
+ l2reflect_remote_eth_addr.addr_bytes[5]);
+ printf("\nStatistics for port %d PID %d on lcore %d ---------"
+ "\nPackets tx: %22" PRIu64 "\nPackets rx: %22" PRIu64
+ "\nBytes tx: %24" PRIu64 " (%8.2f GiB)"
+ "\nBytes rx: %24" PRIu64 " (%8.2f GiB)"
+ "\nErrors tx: %23" PRIu64 "\nErrors rx: %23" PRIu64
+ "\nTimeouts rx: %21" PRIu64 " (>%9" PRIu64 "ms)",
+ l2reflect_port_number, getpid(), rte_lcore_id(),
+ stats.opackets, stats.ipackets, stats.obytes,
+ (double)stats.obytes / bytes_in_gib, stats.ibytes,
+ (double)stats.ibytes / bytes_in_gib, stats.oerrors,
+ stats.ierrors, record.timeouts, l2reflect_sleep_msec);
+ printf(ANSI_BOLD_MAGENTA
+ "\nPort timing statistics ============================="
+ ANSI_RESET);
+ if (l2reflect_state == S_ELECT_LEADER ||
+ record.min_round == MIN_INITIAL) {
+ printf("\n\nBenchmark not started yet...\n");
+ } else {
+ printf("\n" ANSI_BOLD_RED "Max" ANSI_RESET
+ " roundtrip: %19" PRIu64 " us",
+ record.max_round / 1000);
+ printf("\n" ANSI_BOLD_YELLOW "Avg" ANSI_RESET
+ " roundtrip: %19" PRIu64 " us",
+ record.rounds ? (uint64_t)(record.avg_round /
+ record.rounds / 1000) :
+ 0);
+ printf("\n" ANSI_BOLD_GREEN "Min" ANSI_RESET
+ " roundtrip: %19" PRIu64 " us",
+ record.min_round / 1000);
+ }
+ printf(ANSI_BOLD_MAGENTA
+ "\n===================================================="
+ ANSI_RESET "\n");
+}
+
+void
+l2reflect_stats_loop(void)
+{
+ while (!(l2reflect_state & (S_LOCAL_TERM | S_REMOTE_TERM))) {
+ print_stats();
+ if (l2reflect_hist && l2reflect_output_hist) {
+ output_histogram_snapshot();
+ l2reflect_output_hist = 0;
+ }
+ sleep(1);
+ }
+}
+
+char *
+serialize_histogram(__rte_unused const struct stats *record)
+{
+#ifndef RTE_HAS_CJSON
+ return strdup("to print histogram, build with cjson support");
+#else
+ char *str = NULL;
+ char key[8];
+ unsigned int i;
+ cJSON *hist0, *cpu0, *all_cpus, *output;
+
+ output = cJSON_CreateObject();
+ /* version: 1 */
+ cJSON_AddItemToObject(output, "version", cJSON_CreateNumber(1));
+
+ /* cpu 0 histogram */
+ hist0 = cJSON_CreateObject();
+ for (i = 0; i < record->hist_size; ++i) {
+ /* only log positive numbers to meet jitterplot format */
+ if (record->hist[i] != 0) {
+ snprintf(key, 8, "%u", i * hist_bucket_usec);
+ cJSON_AddNumberToObject(hist0, key, record->hist[i]);
+ }
+ }
+
+ /* cpu 0 stats */
+ cpu0 = cJSON_CreateObject();
+ cJSON_AddItemToObject(cpu0, "histogram", hist0);
+ cJSON_AddItemToObject(cpu0, "count",
+ cJSON_CreateNumber(record->rounds));
+ cJSON_AddItemToObject(cpu0, "min",
+ cJSON_CreateNumber(record->min_round));
+ cJSON_AddItemToObject(cpu0, "max",
+ cJSON_CreateNumber(record->max_round));
+ cJSON_AddItemToObject(cpu0, "avg",
+ cJSON_CreateNumber((record->avg_round /
+ record->rounds / 1000)));
+
+ /* combine objects */
+ all_cpus = cJSON_CreateObject();
+ cJSON_AddItemToObject(all_cpus, "0", cpu0);
+ cJSON_AddItemToObject(output, "cpu", all_cpus);
+
+ str = cJSON_Print(output);
+
+ /* cleanup */
+ cJSON_Delete(output);
+
+ return str;
+#endif
+}
diff --git a/app/l2reflect/stats.h b/app/l2reflect/stats.h
new file mode 100644
index 000000000..4b3c11351
--- /dev/null
+++ b/app/l2reflect/stats.h
@@ -0,0 +1,67 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Siemens AG
+ *
+ * authors:
+ * Felix Moessbauer <felix.moessba...@siemens.com>
+ * Henning Schild <henning.sch...@siemens.com>
+ */
+#ifndef _STATS_H_
+#define _STATS_H_
+#include <stdint.h>
+#include <stdatomic.h>
+#include <limits.h>
+
+#include <rte_ethdev.h>
+
+#include "l2reflect.h"
+
+#define MIN_INITIAL ULONG_MAX
+#define HIST_NUM_BUCKETS 128
+#define HIST_CAP_BUCKET (HIST_NUM_BUCKETS - 1)
+
+/* size of each histogram bucket in usec */
+unsigned int hist_bucket_usec;
+
+/* runtime statistics */
+struct stats {
+ uint64_t max_round;
+ uint64_t min_round;
+ uint64_t rounds;
+ uint64_t timeouts;
+ double avg_round;
+ unsigned int hist_size;
+ /* each slot is 10us */
+ uint64_t *hist;
+};
+
+struct stats record;
+char *hist_filename;
+
+void
+init_record(void);
+void
+cleanup_record(void);
+
+void
+l2reflect_stats_loop(void);
+
+/*
+ * Write the histogram to file / stdio without any locking.
+ * When called during the measurement, values are approximations
+ * (racy reads).
+ */
+void
+output_histogram_snapshot(void);
+
+/* Print out statistics on packets dropped */
+void
+print_stats(void);
+
+/*
+ * get a JSON representation of the record
+ */
+char *
+serialize_histogram(const struct stats *record);
+
+#endif /* _STATS_H_ */
diff --git a/app/meson.build b/app/meson.build
index a29eba024..3dfdbb58c 100644
--- a/app/meson.build
+++ b/app/meson.build
@@ -8,6 +8,7 @@ endif
apps = [
'pdump',
'proc-info',
+ 'l2reflect',
'test-acl',
'test-bbdev',
'test-cmdline',
--
2.20.1
