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+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2012 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.
+ *
+ * version: DPDK.L.1.2.3-3
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <sys/queue.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <getopt.h>
+
+#include <netinet/in.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memcpy.h>
+#include <rte_memzone.h>
+#include <rte_tailq.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_launch.h>
+#include <rte_atomic.h>
+#include <rte_lcore.h>
+#include <rte_branch_prediction.h>
+#include <rte_interrupts.h>
+#include <rte_pci.h>
+#include <rte_debug.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_ring.h>
+#include <rte_log.h>
+#include <rte_mempool.h>
+#include <rte_mbuf.h>
+#include <rte_string_fns.h>
+
+/* Macros for printing using RTE_LOG */
+#define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1
+#define FATAL_ERROR(fmt, args...) rte_exit(EXIT_FAILURE, fmt "\n", ##args)
+#define PRINT_INFO(fmt, args...) RTE_LOG(INFO, APP, fmt "\n", ##args)
+
+/* NUMA socket to allocate mbuf pool on */
+#define SOCKET 0
+
+/* Max ports than can be used (each port is associated with two lcores) */
+#define MAX_PORTS (RTE_MAX_LCORE / 2)
+
+/* Max size of a single packet */
+#define MAX_PACKET_SZ 2048
+
+/* Number of bytes needed for each mbuf */
+#define MBUF_SZ \
+ (MAX_PACKET_SZ + sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM)
+
+/* Number of mbufs in mempool that is created */
+#define NB_MBUF 8192
+
+/* How many packets to attempt to read from NIC in one go */
+#define PKT_BURST_SZ 32
+
+/* How many objects (mbufs) to keep in per-lcore mempool cache */
+#define MEMPOOL_CACHE_SZ PKT_BURST_SZ
+
+/* Number of RX ring descriptors */
+#define NB_RXD 128
+
+/* Number of TX ring descriptors */
+#define NB_TXD 512
+
+/*
+ * RX and TX Prefetch, Host, and Write-back threshold values should be
+ * carefully set for optimal performance. Consult the network
+ * controller's datasheet and supporting DPDK documentation for guidance
+ * on how these parameters should be set.
+ */
+/* RX ring configuration */
+static const struct rte_eth_rxconf rx_conf = {
+ .rx_thresh = {
+ .pthresh = 8, /* Ring prefetch threshold */
+ .hthresh = 8, /* Ring host threshold */
+ .wthresh = 4, /* Ring writeback threshold */
+ },
+ .rx_free_thresh = 0, /* Immediately free RX descriptors */
+};
+
+/*
+ * These default values are optimized for use with the Intel(R) 82599 10 GbE
+ * Controller and the DPDK ixgbe PMD. Consider using other values for other
+ * network controllers and/or network drivers.
+ */
+/* TX ring configuration */
+static const struct rte_eth_txconf tx_conf = {
+ .tx_thresh = {
+ .pthresh = 36, /* Ring prefetch threshold */
+ .hthresh = 0, /* Ring host threshold */
+ .wthresh = 0, /* Ring writeback threshold */
+ },
+ .tx_free_thresh = 0, /* Use PMD default values */
+ .tx_rs_thresh = 0, /* Use PMD default values */
+};
+
+/* Options for configuring ethernet port */
+static const struct rte_eth_conf port_conf = {
+ .rxmode = {
+ .header_split = 0, /* Header Split disabled */
+ .hw_ip_checksum = 0, /* IP checksum offload disabled */
+ .hw_vlan_filter = 0, /* VLAN filtering disabled */
+ .jumbo_frame = 0, /* Jumbo Frame Support disabled */
+ .hw_strip_crc = 0, /* CRC stripped by hardware */
+ },
+ .txmode = {
+ },
+};
+
+/* Mempool for mbufs */
+static struct rte_mempool * pktmbuf_pool = NULL;
+
+/* Mask of enabled ports */
+static uint32_t ports_mask = 0;
+
+/* Mask of cores that read from NIC and write to tap */
+static uint32_t input_cores_mask = 0;
+
+/* Mask of cores that read from tap and write to NIC */
+static uint32_t output_cores_mask = 0;
+
+/* Array storing port_id that is associated with each lcore */
+static uint8_t port_ids[RTE_MAX_LCORE];
+
+/* Structure type for recording lcore-specific stats */
+struct stats {
+ uint64_t rx;
+ uint64_t tx;
+ uint64_t dropped;
+};
+
+/* Array of lcore-specific stats */
+static struct stats lcore_stats[RTE_MAX_LCORE];
+
+/* Print out statistics on packets handled */
+static void
+print_stats(void)
+{
+ unsigned i;
+
+ printf("\n**Exception-Path example application statistics**\n"
+ "======= ====== ============ ============ ===============\n"
+ " Lcore Port RX TX Dropped on TX\n"
+ "------- ------ ------------ ------------ ---------------\n");
+ RTE_LCORE_FOREACH(i) {
+ printf("%6u %7u %13"PRIu64" %13"PRIu64" %16"PRIu64"\n",
+ i, (unsigned)port_ids[i],
+ lcore_stats[i].rx, lcore_stats[i].tx,
+ lcore_stats[i].dropped);
+ }
+ printf("======= ====== ============ ============ ===============\n");
+}
+
+/* Custom handling of signals to handle stats */
+static void
+signal_handler(int signum)
+{
+ /* When we receive a USR1 signal, print stats */
+ if (signum == SIGUSR1) {
+ print_stats();
+ }
+
+ /* When we receive a USR2 signal, reset stats */
+ if (signum == SIGUSR2) {
+ memset(&lcore_stats, 0, sizeof(lcore_stats));
+ printf("\n**Statistics have been reset**\n");
+ return;
+ }
+}
+
+/*
+ * Create a tap network interface, or use existing one with same name.
+ * If name[0]='\0' then a name is automatically assigned and returned in name.
+ */
+static int tap_create(char *name)
+{
+ struct ifreq ifr;
+ int fd, ret;
+
+ fd = open("/dev/net/tun", O_RDWR);
+ if (fd < 0)
+ return fd;
+
+ memset(&ifr, 0, sizeof(ifr));
+
+ /* TAP device without packet information */
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+
+ if (name && *name)
+ rte_snprintf(ifr.ifr_name, IFNAMSIZ, name);
+
+ ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
+ if (ret < 0) {
+ close(fd);
+ return ret;
+ }
+
+ if (name)
+ rte_snprintf(name, IFNAMSIZ, ifr.ifr_name);
+
+ return fd;
+}
+
+/* Main processing loop */
+static __attribute__((noreturn)) int
+main_loop(__attribute__((unused)) void *arg)
+{
+ const unsigned lcore_id = rte_lcore_id();
+ char tap_name[IFNAMSIZ];
+ int tap_fd;
+
+ /* Create new tap interface */
+ rte_snprintf(tap_name, IFNAMSIZ, "tap_dpdk_%.2u", lcore_id);
+ tap_fd = tap_create(tap_name);
+ if (tap_fd < 0)
+ FATAL_ERROR("Could not create tap interface \"%s\" (%d)",
+ tap_name, tap_fd);
+
+ if ((1 << lcore_id) & input_cores_mask) {
+ PRINT_INFO("Lcore %u is reading from port %u and writing to %s",
+ lcore_id, (unsigned)port_ids[lcore_id], tap_name);
+ fflush(stdout);
+ /* Loop forever reading from NIC and writing to tap */
+ for (;;) {
+ struct rte_mbuf *pkts_burst[PKT_BURST_SZ];
+ unsigned i;
+ const unsigned nb_rx =
+ rte_eth_rx_burst(port_ids[lcore_id], 0,
+ pkts_burst, PKT_BURST_SZ);
+ lcore_stats[lcore_id].rx += nb_rx;
+ for (i = 0; likely(i < nb_rx); i++) {
+ struct rte_mbuf *m = pkts_burst[i];
+ /* Ignore return val from write() */
+ int ret = write(tap_fd,
+ rte_pktmbuf_mtod(m, void*),
+ rte_pktmbuf_data_len(m));
+ rte_pktmbuf_free(m);
+ if (unlikely(ret < 0))
+ lcore_stats[lcore_id].dropped++;
+ else
+ lcore_stats[lcore_id].tx++;
+ }
+ }
+ }
+ else if ((1 << lcore_id) & output_cores_mask) {
+ PRINT_INFO("Lcore %u is reading from %s and writing to port %u",
+ lcore_id, tap_name, (unsigned)port_ids[lcore_id]);
+ fflush(stdout);
+ /* Loop forever reading from tap and writing to NIC */
+ for (;;) {
+ int ret;
+ struct rte_mbuf *m = rte_pktmbuf_alloc(pktmbuf_pool);
+ if (m == NULL)
+ continue;
+
+ ret = read(tap_fd, m->pkt.data, MAX_PACKET_SZ);
+ lcore_stats[lcore_id].rx++;
+ if (unlikely(ret < 0)) {
+ FATAL_ERROR("Reading from %s interface failed",
+ tap_name);
+ }
+ m->pkt.nb_segs = 1;
+ m->pkt.next = NULL;
+ m->pkt.pkt_len = (uint16_t)ret;
+ m->pkt.data_len = (uint16_t)ret;
+ ret = rte_eth_tx_burst(port_ids[lcore_id], 0, &m, 1);
+ if (unlikely(ret < 1)) {
+ rte_pktmbuf_free(m);
+ lcore_stats[lcore_id].dropped++;
+ }
+ else {
+ lcore_stats[lcore_id].tx++;
+ }
+ }
+ }
+ else {
+ PRINT_INFO("Lcore %u has nothing to do", lcore_id);
+ for (;;)
+ ; /* loop doing nothing */
+ }
+ /*
+ * Tap file is closed automatically when program exits. Putting close()
+ * here will cause the compiler to give an error about unreachable code.
+ */
+}
+
+/* Display usage instructions */
+static void
+print_usage(const char *prgname)
+{
+ PRINT_INFO("\nUsage: %s [EAL options] -- -p PORTMASK -i IN_CORES -o OUT_CORES\n"
+ " -p PORTMASK: hex bitmask of ports to use\n"
+ " -i IN_CORES: hex bitmask of cores which read from NIC\n"
+ " -o OUT_CORES: hex bitmask of cores which write to NIC",
+ prgname);
+}
+
+/* Convert string to unsigned number. 0 is returned if error occurs */
+static uint32_t
+parse_unsigned(const char *portmask)
+{
+ char *end = NULL;
+ unsigned long num;
+
+ num = strtoul(portmask, &end, 16);
+ if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
+ return 0;
+
+ return (uint32_t)num;
+}
+
+/* Record affinities between ports and lcores in global port_ids[] array */
+static void
+setup_port_lcore_affinities(void)
+{
+ unsigned i;
+ uint8_t tx_port = 0;
+ uint8_t rx_port = 0;
+
+ /* Setup port_ids[] array, and check masks were ok */
+ RTE_LCORE_FOREACH(i) {
+ if (input_cores_mask & (1 << i)) {
+ /* Skip ports that are not enabled */
+ while ((ports_mask & (1 << rx_port)) == 0) {
+ rx_port++;
+ if (rx_port > (sizeof(ports_mask) * 8))
+ goto fail; /* not enough ports */
+ }
+
+ port_ids[i] = rx_port++;
+ }
+ else if (output_cores_mask & (1 << i)) {
+ /* Skip ports that are not enabled */
+ while ((ports_mask & (1 << tx_port)) == 0) {
+ tx_port++;
+ if (tx_port > (sizeof(ports_mask) * 8))
+ goto fail; /* not enough ports */
+ }
+
+ port_ids[i] = tx_port++;
+ }
+ }
+
+ if (rx_port != tx_port)
+ goto fail; /* uneven number of cores in masks */
+
+ if (ports_mask & (~((1 << rx_port) - 1)))
+ goto fail; /* unused ports */
+
+ return;
+fail:
+ FATAL_ERROR("Invalid core/port masks specified on command line");
+}
+
+/* Parse the arguments given in the command line of the application */
+static void
+parse_args(int argc, char **argv)
+{
+ int opt;
+ const char *prgname = argv[0];
+
+ /* Disable printing messages within getopt() */
+ opterr = 0;
+
+ /* Parse command line */
+ while ((opt = getopt(argc, argv, "i:o:p:")) != EOF) {
+ switch (opt) {
+ case 'i':
+ input_cores_mask = parse_unsigned(optarg);
+ break;
+ case 'o':
+ output_cores_mask = parse_unsigned(optarg);
+ break;
+ case 'p':
+ ports_mask = parse_unsigned(optarg);
+ break;
+ default:
+ print_usage(prgname);
+ FATAL_ERROR("Invalid option specified");
+ }
+ }
+
+ /* Check that options were parsed ok */
+ if (input_cores_mask == 0) {
+ print_usage(prgname);
+ FATAL_ERROR("IN_CORES not specified correctly");
+ }
+ if (output_cores_mask == 0) {
+ print_usage(prgname);
+ FATAL_ERROR("OUT_CORES not specified correctly");
+ }
+ if (ports_mask == 0) {
+ print_usage(prgname);
+ FATAL_ERROR("PORTMASK not specified correctly");
+ }
+
+ setup_port_lcore_affinities();
+}
+
+/* Initialise a single port on an Ethernet device */
+static void
+init_port(uint8_t port)
+{
+ struct rte_eth_link link;
+ int ret;
+
+ /* Initialise device and RX/TX queues */
+ PRINT_INFO("Initialising port %u ...", (unsigned)port);
+ fflush(stdout);
+ ret = rte_eth_dev_configure(port, 1, 1, &port_conf);
+ if (ret < 0)
+ FATAL_ERROR("Could not configure port%u (%d)",
+ (unsigned)port, ret);
+
+ ret = rte_eth_rx_queue_setup(port, 0, NB_RXD, SOCKET, &rx_conf,
+ pktmbuf_pool);
+ if (ret < 0)
+ FATAL_ERROR("Could not setup up RX queue for port%u (%d)",
+ (unsigned)port, ret);
+
+ ret = rte_eth_tx_queue_setup(port, 0, NB_TXD, SOCKET, &tx_conf);
+ if (ret < 0)
+ FATAL_ERROR("Could not setup up TX queue for port%u (%d)",
+ (unsigned)port, ret);
+
+ ret = rte_eth_dev_start(port);
+ if (ret < 0)
+ FATAL_ERROR("Could not start port%u (%d)", (unsigned)port, ret);
+
+ /* Everything is setup and started, print link status */
+ rte_eth_link_get(port, &link);
+ if (link.link_status)
+ PRINT_INFO(" link up - %u Mbit/s - %s",
+ (unsigned)link.link_speed,
+ (link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
+ ("full-duplex") : ("half-duplex"));
+ else
+ PRINT_INFO(" link down");
+
+ rte_eth_promiscuous_enable(port);
+}
+
+/* Initialise ports/queues etc. and start main loop on each core */
+int
+main(int argc, char** argv)
+{
+ int ret;
+ unsigned i,high_port;
+ uint8_t nb_sys_ports, port;
+
+ /* Associate signal_hanlder function with USR signals */
+ signal(SIGUSR1, signal_handler);
+ signal(SIGUSR2, signal_handler);
+
+ /* Initialise EAL */
+ ret = rte_eal_init(argc, argv);
+ if (ret < 0)
+ FATAL_ERROR("Could not initialise EAL (%d)", ret);
+ argc -= ret;
+ argv += ret;
+
+ /* Parse application arguments (after the EAL ones) */
+ parse_args(argc, argv);
+
+ /* Create the mbuf pool */
+ pktmbuf_pool = rte_mempool_create("mbuf_pool", NB_MBUF, MBUF_SZ,
+ MEMPOOL_CACHE_SZ,
+ sizeof(struct rte_pktmbuf_pool_private),
+ rte_pktmbuf_pool_init, NULL, rte_pktmbuf_init, NULL,
+ SOCKET, 0);
+ if (pktmbuf_pool == NULL) {
+ FATAL_ERROR("Could not initialise mbuf pool");
+ return -1;
+ }
+
+ /* Initialise PMD driver(s) */
+#ifdef RTE_LIBRTE_IGB_PMD
+ ret = rte_igb_pmd_init();
+ if (ret < 0)
+ FATAL_ERROR("Could not initialise igb PMD (%d)", ret);
+#endif
+#ifdef RTE_LIBRTE_IXGBE_PMD
+ ret = rte_ixgbe_pmd_init();
+ if (ret < 0)
+ FATAL_ERROR("Could not initialise ixgbe PMD (%d)", ret);
+#endif
+
+ /* Scan PCI bus for recognised devices */
+ ret = rte_eal_pci_probe();
+ if (ret < 0)
+ FATAL_ERROR("Could not probe PCI (%d)", ret);
+
+ /* Get number of ports found in scan */
+ nb_sys_ports = rte_eth_dev_count();
+ if (nb_sys_ports == 0)
+ FATAL_ERROR("No supported Ethernet devices found - check that "
+ "CONFIG_RTE_LIBRTE_IGB_PMD=y and/or "
+ "CONFIG_RTE_LIBRTE_IXGBE_PMD=y in the config file");
+ /* Find highest port set in portmask */
+ for (high_port = (sizeof(ports_mask) * 8) - 1;
+ (high_port != 0) && !(ports_mask & (1 << high_port));
+ high_port--)
+ ; /* empty body */
+ if (high_port > nb_sys_ports)
+ FATAL_ERROR("Port mask requires more ports than available");
+
+ /* Initialise each port */
+ for (port = 0; port < nb_sys_ports; port++) {
+ /* Skip ports that are not enabled */
+ if ((ports_mask & (1 << port)) == 0) {
+ continue;
+ }
+ init_port(port);
+ }
+
+ /* Launch per-lcore function on every lcore */
+ rte_eal_mp_remote_launch(main_loop, NULL, CALL_MASTER);
+ RTE_LCORE_FOREACH_SLAVE(i) {
+ if (rte_eal_wait_lcore(i) < 0)
+ return -1;
+ }
+
+ return 0;
+}