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Diffstat (limited to 'src/seastar/dpdk/examples/timer/main.c')
| -rw-r--r-- | src/seastar/dpdk/examples/timer/main.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/seastar/dpdk/examples/timer/main.c b/src/seastar/dpdk/examples/timer/main.c new file mode 100644 index 00000000..37ad559e --- /dev/null +++ b/src/seastar/dpdk/examples/timer/main.c @@ -0,0 +1,151 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 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 <stdio.h> +#include <string.h> +#include <stdint.h> +#include <errno.h> +#include <sys/queue.h> + +#include <rte_common.h> +#include <rte_memory.h> +#include <rte_memzone.h> +#include <rte_launch.h> +#include <rte_eal.h> +#include <rte_per_lcore.h> +#include <rte_lcore.h> +#include <rte_cycles.h> +#include <rte_timer.h> +#include <rte_debug.h> + +#define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */ + +static struct rte_timer timer0; +static struct rte_timer timer1; + +/* timer0 callback */ +static void +timer0_cb(__attribute__((unused)) struct rte_timer *tim, + __attribute__((unused)) void *arg) +{ + static unsigned counter = 0; + unsigned lcore_id = rte_lcore_id(); + + printf("%s() on lcore %u\n", __func__, lcore_id); + + /* this timer is automatically reloaded until we decide to + * stop it, when counter reaches 20. */ + if ((counter ++) == 20) + rte_timer_stop(tim); +} + +/* timer1 callback */ +static void +timer1_cb(__attribute__((unused)) struct rte_timer *tim, + __attribute__((unused)) void *arg) +{ + unsigned lcore_id = rte_lcore_id(); + uint64_t hz; + + printf("%s() on lcore %u\n", __func__, lcore_id); + + /* reload it on another lcore */ + hz = rte_get_timer_hz(); + lcore_id = rte_get_next_lcore(lcore_id, 0, 1); + rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL); +} + +static __attribute__((noreturn)) int +lcore_mainloop(__attribute__((unused)) void *arg) +{ + uint64_t prev_tsc = 0, cur_tsc, diff_tsc; + unsigned lcore_id; + + lcore_id = rte_lcore_id(); + printf("Starting mainloop on core %u\n", lcore_id); + + while (1) { + /* + * Call the timer handler on each core: as we don't + * need a very precise timer, so only call + * rte_timer_manage() every ~10ms (at 2Ghz). In a real + * application, this will enhance performances as + * reading the HPET timer is not efficient. + */ + cur_tsc = rte_rdtsc(); + diff_tsc = cur_tsc - prev_tsc; + if (diff_tsc > TIMER_RESOLUTION_CYCLES) { + rte_timer_manage(); + prev_tsc = cur_tsc; + } + } +} + +int +main(int argc, char **argv) +{ + int ret; + uint64_t hz; + unsigned lcore_id; + + /* init EAL */ + ret = rte_eal_init(argc, argv); + if (ret < 0) + rte_panic("Cannot init EAL\n"); + + /* init RTE timer library */ + rte_timer_subsystem_init(); + + /* init timer structures */ + rte_timer_init(&timer0); + rte_timer_init(&timer1); + + /* load timer0, every second, on master lcore, reloaded automatically */ + hz = rte_get_timer_hz(); + lcore_id = rte_lcore_id(); + rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL); + + /* load timer1, every second/3, on next lcore, reloaded manually */ + lcore_id = rte_get_next_lcore(lcore_id, 0, 1); + rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL); + + /* call lcore_mainloop() on every slave lcore */ + RTE_LCORE_FOREACH_SLAVE(lcore_id) { + rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id); + } + + /* call it on master lcore too */ + (void) lcore_mainloop(NULL); + + return 0; +} |