From e7bc40da738c24a0cf23517f9d7144c0c96a75de Mon Sep 17 00:00:00 2001 From: Bruce Richardson Date: Mon, 23 Feb 2015 18:30:10 +0000 Subject: [PATCH] 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 Signed-off-by: John McNamara Acked-by: Declan Doherty --- MAINTAINERS | 4 + examples/Makefile | 1 + examples/rxtx_callbacks/Makefile | 57 ++++++++ examples/rxtx_callbacks/main.c | 228 +++++++++++++++++++++++++++++++ 4 files changed, 290 insertions(+) create mode 100644 examples/rxtx_callbacks/Makefile create mode 100644 examples/rxtx_callbacks/main.c diff --git a/MAINTAINERS b/MAINTAINERS index baf8e36a1b..7750881760 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -433,6 +433,10 @@ F: doc/guides/sample_app_ug/netmap_compatibility.rst F: examples/quota_watermark/ F: doc/guides/sample_app_ug/quota_watermark.rst +M: Bruce Richardson +M: John McNamara +F: examples/rxtx_callbacks/ + F: examples/skeleton/ F: examples/vmdq/ diff --git a/examples/Makefile b/examples/Makefile index fa5a0859c3..3c241537a0 100644 --- a/examples/Makefile +++ b/examples/Makefile @@ -64,6 +64,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_REORDER) += packet_ordering DIRS-$(CONFIG_RTE_LIBRTE_METER) += qos_meter DIRS-$(CONFIG_RTE_LIBRTE_SCHED) += qos_sched DIRS-y += quota_watermark +DIRS-$(CONFIG_RTE_ETHDEV_RXTX_CALLBACKS) += rxtx_callbacks DIRS-y += skeleton DIRS-y += timer DIRS-$(CONFIG_RTE_LIBRTE_VHOST) += vhost diff --git a/examples/rxtx_callbacks/Makefile b/examples/rxtx_callbacks/Makefile new file mode 100644 index 0000000000..0fafbb721e --- /dev/null +++ b/examples/rxtx_callbacks/Makefile @@ -0,0 +1,57 @@ +# BSD LICENSE +# +# Copyright(c) 2010-2015 Intel Corporation. All rights reserved. +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# * Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in +# the documentation and/or other materials provided with the +# distribution. +# * Neither the name of Intel Corporation nor the names of its +# contributors may be used to endorse or promote products derived +# from this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +ifeq ($(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 0000000000..9e5e68efee --- /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 +#include +#include +#include +#include +#include +#include + +#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; +} -- 2.20.1