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>
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@ -433,6 +433,10 @@ F: doc/guides/sample_app_ug/netmap_compatibility.rst
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F: examples/quota_watermark/
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F: doc/guides/sample_app_ug/quota_watermark.rst
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M: Bruce Richardson <bruce.richardson@intel.com>
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M: John McNamara <john.mcnamara@intel.com>
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F: examples/rxtx_callbacks/
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F: examples/skeleton/
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F: examples/vmdq/
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@ -64,6 +64,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_REORDER) += packet_ordering
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DIRS-$(CONFIG_RTE_LIBRTE_METER) += qos_meter
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DIRS-$(CONFIG_RTE_LIBRTE_SCHED) += qos_sched
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DIRS-y += quota_watermark
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DIRS-$(CONFIG_RTE_ETHDEV_RXTX_CALLBACKS) += rxtx_callbacks
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DIRS-y += skeleton
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DIRS-y += timer
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DIRS-$(CONFIG_RTE_LIBRTE_VHOST) += vhost
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57
examples/rxtx_callbacks/Makefile
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57
examples/rxtx_callbacks/Makefile
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@ -0,0 +1,57 @@
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# BSD LICENSE
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#
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# Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Intel Corporation nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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ifeq ($(RTE_SDK),)
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$(error "Please define RTE_SDK environment variable")
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endif
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# Default target, can be overridden by command line or environment
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RTE_TARGET ?= x86_64-native-linuxapp-gcc
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include $(RTE_SDK)/mk/rte.vars.mk
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# binary name
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APP = rxtx_callbacks
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# all source are stored in SRCS-y
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SRCS-y := main.c
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CFLAGS += $(WERROR_FLAGS)
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# workaround for a gcc bug with noreturn attribute
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# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603
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ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
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CFLAGS_main.o += -Wno-return-type
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endif
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EXTRA_CFLAGS += -O3 -g -Wfatal-errors
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include $(RTE_SDK)/mk/rte.extapp.mk
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228
examples/rxtx_callbacks/main.c
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228
examples/rxtx_callbacks/main.c
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@ -0,0 +1,228 @@
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/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <inttypes.h>
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#include <rte_eal.h>
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#include <rte_ethdev.h>
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#include <rte_cycles.h>
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#include <rte_lcore.h>
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#include <rte_mbuf.h>
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#define RX_RING_SIZE 128
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#define TX_RING_SIZE 512
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#define NUM_MBUFS 8191
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#define MBUF_SIZE (1600 + sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM)
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#define MBUF_CACHE_SIZE 250
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#define BURST_SIZE 32
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static const struct rte_eth_conf port_conf_default = {
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.rxmode = { .max_rx_pkt_len = ETHER_MAX_LEN, },
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};
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static unsigned nb_ports;
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static struct {
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uint64_t total_cycles;
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uint64_t total_pkts;
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} latency_numbers;
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static uint16_t
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add_timestamps(uint8_t port __rte_unused, uint16_t qidx __rte_unused,
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struct rte_mbuf **pkts, uint16_t nb_pkts, void *_ __rte_unused)
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{
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unsigned i;
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uint64_t now = rte_rdtsc();
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for (i = 0; i < nb_pkts; i++)
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pkts[i]->udata64 = now;
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return nb_pkts;
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}
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static uint16_t
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calc_latency(uint8_t port __rte_unused, uint16_t qidx __rte_unused,
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struct rte_mbuf **pkts, uint16_t nb_pkts, void *_ __rte_unused)
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{
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uint64_t cycles = 0;
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uint64_t now = rte_rdtsc();
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unsigned i;
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for (i = 0; i < nb_pkts; i++)
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cycles += now - pkts[i]->udata64;
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latency_numbers.total_cycles += cycles;
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latency_numbers.total_pkts += nb_pkts;
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if (latency_numbers.total_pkts > (100 * 1000 * 1000ULL)) {
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printf("Latency = %"PRIu64" cycles\n",
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latency_numbers.total_cycles / latency_numbers.total_pkts);
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latency_numbers.total_cycles = latency_numbers.total_pkts = 0;
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}
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return nb_pkts;
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}
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/*
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* Initialises a given port using global settings and with the rx buffers
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* coming from the mbuf_pool passed as parameter
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*/
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static inline int
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port_init(uint8_t port, struct rte_mempool *mbuf_pool)
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{
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struct rte_eth_conf port_conf = port_conf_default;
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const uint16_t rx_rings = 1, tx_rings = 1;
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int retval;
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uint16_t q;
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if (port >= rte_eth_dev_count())
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return -1;
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retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
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if (retval != 0)
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return retval;
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for (q = 0; q < rx_rings; q++) {
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retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
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rte_eth_dev_socket_id(port), NULL, mbuf_pool);
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if (retval < 0)
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return retval;
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}
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for (q = 0; q < tx_rings; q++) {
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retval = rte_eth_tx_queue_setup(port, q, TX_RING_SIZE,
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rte_eth_dev_socket_id(port), NULL);
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if (retval < 0)
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return retval;
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}
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retval = rte_eth_dev_start(port);
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if (retval < 0)
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return retval;
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struct ether_addr addr;
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rte_eth_macaddr_get(port, &addr);
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printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
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" %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
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(unsigned)port,
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addr.addr_bytes[0], addr.addr_bytes[1],
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addr.addr_bytes[2], addr.addr_bytes[3],
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addr.addr_bytes[4], addr.addr_bytes[5]);
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rte_eth_promiscuous_enable(port);
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rte_eth_add_rx_callback(port, 0, add_timestamps, NULL);
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rte_eth_add_tx_callback(port, 0, calc_latency, NULL);
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return 0;
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}
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/*
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* Main thread that does the work, reading from INPUT_PORT
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* and writing to OUTPUT_PORT
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*/
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static __attribute__((noreturn)) void
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lcore_main(void)
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{
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uint8_t port;
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for (port = 0; port < nb_ports; port++)
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if (rte_eth_dev_socket_id(port) > 0 &&
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rte_eth_dev_socket_id(port) !=
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(int)rte_socket_id())
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printf("WARNING, port %u is on remote NUMA node to "
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"polling thread.\n\tPerformance will "
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"not be optimal.\n", port);
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printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
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rte_lcore_id());
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for (;;) {
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for (port = 0; port < nb_ports; port++) {
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struct rte_mbuf *bufs[BURST_SIZE];
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const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
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bufs, BURST_SIZE);
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if (unlikely(nb_rx == 0))
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continue;
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const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
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bufs, nb_rx);
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if (unlikely(nb_tx < nb_rx)) {
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uint16_t buf;
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for (buf = nb_tx; buf < nb_rx; buf++)
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rte_pktmbuf_free(bufs[buf]);
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}
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}
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}
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}
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/* Main function, does initialisation and calls the per-lcore functions */
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int
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main(int argc, char *argv[])
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{
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struct rte_mempool *mbuf_pool;
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uint8_t portid;
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/* init EAL */
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int ret = rte_eal_init(argc, argv);
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if (ret < 0)
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rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
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argc -= ret;
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argv += ret;
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nb_ports = rte_eth_dev_count();
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if (nb_ports < 2 || (nb_ports & 1))
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rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
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mbuf_pool = rte_mempool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
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MBUF_SIZE, MBUF_CACHE_SIZE,
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sizeof(struct rte_pktmbuf_pool_private),
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rte_pktmbuf_pool_init, NULL,
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rte_pktmbuf_init, NULL,
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rte_socket_id(), 0);
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if (mbuf_pool == NULL)
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rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
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/* initialize all ports */
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for (portid = 0; portid < nb_ports; portid++)
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if (port_init(portid, mbuf_pool) != 0)
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rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8"\n",
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portid);
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if (rte_lcore_count() > 1)
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printf("\nWARNING: Too much enabled lcores - "
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"App uses only 1 lcore\n");
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/* call lcore_main on master core only */
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lcore_main();
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return 0;
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}
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