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authorBruce Richardson <bruce.richardson@intel.com>2015-02-23 18:30:10 +0000
committerThomas Monjalon <thomas.monjalon@6wind.com>2015-02-24 00:38:31 +0100
commite7bc40da738c24a0cf23517f9d7144c0c96a75de (patch)
tree13471151c50b03bed6b1ddc48e79ce82d02a86c5 /examples/rxtx_callbacks
parent4dc294158cac46b6b69b60ff4216503777c5eb57 (diff)
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examples/rxtx_callbacks: show use of callbacks
Example showing how callbacks can be used to insert a timestamp into each packet on RX. On TX the timestamp is used to calculate the packet latency through the app, in cycles. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com> Signed-off-by: John McNamara <john.mcnamara@intel.com> Acked-by: Declan Doherty <declan.doherty@intel.com>
Diffstat (limited to 'examples/rxtx_callbacks')
-rw-r--r--examples/rxtx_callbacks/Makefile57
-rw-r--r--examples/rxtx_callbacks/main.c228
2 files changed, 285 insertions, 0 deletions
diff --git a/examples/rxtx_callbacks/Makefile b/examples/rxtx_callbacks/Makefile
new file mode 100644
index 0000000..0fafbb7
--- /dev/null
+++ b/examples/rxtx_callbacks/Makefile
@@ -0,0 +1,57 @@
+# BSD LICENSE
+#
+# Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in
+# the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Intel Corporation nor the names of its
+# contributors may be used to endorse or promote products derived
+# from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ifeq ($(RTE_SDK),)
+$(error "Please define RTE_SDK environment variable")
+endif
+
+# Default target, can be overridden by command line or environment
+RTE_TARGET ?= x86_64-native-linuxapp-gcc
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# binary name
+APP = rxtx_callbacks
+
+# all source are stored in SRCS-y
+SRCS-y := main.c
+
+CFLAGS += $(WERROR_FLAGS)
+
+# workaround for a gcc bug with noreturn attribute
+# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603
+ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
+CFLAGS_main.o += -Wno-return-type
+endif
+
+EXTRA_CFLAGS += -O3 -g -Wfatal-errors
+
+include $(RTE_SDK)/mk/rte.extapp.mk
diff --git a/examples/rxtx_callbacks/main.c b/examples/rxtx_callbacks/main.c
new file mode 100644
index 0000000..9e5e68e
--- /dev/null
+++ b/examples/rxtx_callbacks/main.c
@@ -0,0 +1,228 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <inttypes.h>
+#include <rte_eal.h>
+#include <rte_ethdev.h>
+#include <rte_cycles.h>
+#include <rte_lcore.h>
+#include <rte_mbuf.h>
+
+#define RX_RING_SIZE 128
+#define TX_RING_SIZE 512
+
+#define NUM_MBUFS 8191
+#define MBUF_SIZE (1600 + sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM)
+#define MBUF_CACHE_SIZE 250
+#define BURST_SIZE 32
+
+static const struct rte_eth_conf port_conf_default = {
+ .rxmode = { .max_rx_pkt_len = ETHER_MAX_LEN, },
+};
+
+static unsigned nb_ports;
+
+static struct {
+ uint64_t total_cycles;
+ uint64_t total_pkts;
+} latency_numbers;
+
+
+static uint16_t
+add_timestamps(uint8_t port __rte_unused, uint16_t qidx __rte_unused,
+ struct rte_mbuf **pkts, uint16_t nb_pkts, void *_ __rte_unused)
+{
+ unsigned i;
+ uint64_t now = rte_rdtsc();
+
+ for (i = 0; i < nb_pkts; i++)
+ pkts[i]->udata64 = now;
+ return nb_pkts;
+}
+
+static uint16_t
+calc_latency(uint8_t port __rte_unused, uint16_t qidx __rte_unused,
+ struct rte_mbuf **pkts, uint16_t nb_pkts, void *_ __rte_unused)
+{
+ uint64_t cycles = 0;
+ uint64_t now = rte_rdtsc();
+ unsigned i;
+
+ for (i = 0; i < nb_pkts; i++)
+ cycles += now - pkts[i]->udata64;
+ latency_numbers.total_cycles += cycles;
+ latency_numbers.total_pkts += nb_pkts;
+
+ if (latency_numbers.total_pkts > (100 * 1000 * 1000ULL)) {
+ printf("Latency = %"PRIu64" cycles\n",
+ latency_numbers.total_cycles / latency_numbers.total_pkts);
+ latency_numbers.total_cycles = latency_numbers.total_pkts = 0;
+ }
+ return nb_pkts;
+}
+
+/*
+ * Initialises a given port using global settings and with the rx buffers
+ * coming from the mbuf_pool passed as parameter
+ */
+static inline int
+port_init(uint8_t port, struct rte_mempool *mbuf_pool)
+{
+ struct rte_eth_conf port_conf = port_conf_default;
+ const uint16_t rx_rings = 1, tx_rings = 1;
+ int retval;
+ uint16_t q;
+
+ if (port >= rte_eth_dev_count())
+ return -1;
+
+ retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
+ if (retval != 0)
+ return retval;
+
+ for (q = 0; q < rx_rings; q++) {
+ retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
+ rte_eth_dev_socket_id(port), NULL, mbuf_pool);
+ if (retval < 0)
+ return retval;
+ }
+
+ for (q = 0; q < tx_rings; q++) {
+ retval = rte_eth_tx_queue_setup(port, q, TX_RING_SIZE,
+ rte_eth_dev_socket_id(port), NULL);
+ if (retval < 0)
+ return retval;
+ }
+
+ retval = rte_eth_dev_start(port);
+ if (retval < 0)
+ return retval;
+
+ struct ether_addr addr;
+
+ rte_eth_macaddr_get(port, &addr);
+ printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
+ " %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
+ (unsigned)port,
+ addr.addr_bytes[0], addr.addr_bytes[1],
+ addr.addr_bytes[2], addr.addr_bytes[3],
+ addr.addr_bytes[4], addr.addr_bytes[5]);
+
+ rte_eth_promiscuous_enable(port);
+ rte_eth_add_rx_callback(port, 0, add_timestamps, NULL);
+ rte_eth_add_tx_callback(port, 0, calc_latency, NULL);
+
+ return 0;
+}
+
+/*
+ * Main thread that does the work, reading from INPUT_PORT
+ * and writing to OUTPUT_PORT
+ */
+static __attribute__((noreturn)) void
+lcore_main(void)
+{
+ uint8_t port;
+
+ for (port = 0; port < nb_ports; port++)
+ if (rte_eth_dev_socket_id(port) > 0 &&
+ rte_eth_dev_socket_id(port) !=
+ (int)rte_socket_id())
+ printf("WARNING, port %u is on remote NUMA node to "
+ "polling thread.\n\tPerformance will "
+ "not be optimal.\n", port);
+
+ printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
+ rte_lcore_id());
+ for (;;) {
+ for (port = 0; port < nb_ports; port++) {
+ struct rte_mbuf *bufs[BURST_SIZE];
+ const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
+ bufs, BURST_SIZE);
+ if (unlikely(nb_rx == 0))
+ continue;
+ const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
+ bufs, nb_rx);
+ if (unlikely(nb_tx < nb_rx)) {
+ uint16_t buf;
+
+ for (buf = nb_tx; buf < nb_rx; buf++)
+ rte_pktmbuf_free(bufs[buf]);
+ }
+ }
+ }
+}
+
+/* Main function, does initialisation and calls the per-lcore functions */
+int
+main(int argc, char *argv[])
+{
+ struct rte_mempool *mbuf_pool;
+ uint8_t portid;
+
+ /* init EAL */
+ int ret = rte_eal_init(argc, argv);
+
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
+ argc -= ret;
+ argv += ret;
+
+ nb_ports = rte_eth_dev_count();
+ if (nb_ports < 2 || (nb_ports & 1))
+ rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
+
+ mbuf_pool = rte_mempool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
+ MBUF_SIZE, MBUF_CACHE_SIZE,
+ sizeof(struct rte_pktmbuf_pool_private),
+ rte_pktmbuf_pool_init, NULL,
+ rte_pktmbuf_init, NULL,
+ rte_socket_id(), 0);
+ if (mbuf_pool == NULL)
+ rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
+
+ /* initialize all ports */
+ for (portid = 0; portid < nb_ports; portid++)
+ if (port_init(portid, mbuf_pool) != 0)
+ rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8"\n",
+ portid);
+
+ if (rte_lcore_count() > 1)
+ printf("\nWARNING: Too much enabled lcores - "
+ "App uses only 1 lcore\n");
+
+ /* call lcore_main on master core only */
+ lcore_main();
+ return 0;
+}