diff options
Diffstat (limited to 'src/dpdk_lib18/librte_eal/bsdapp/eal/eal_timer.c')
| -rwxr-xr-x | src/dpdk_lib18/librte_eal/bsdapp/eal/eal_timer.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/dpdk_lib18/librte_eal/bsdapp/eal/eal_timer.c b/src/dpdk_lib18/librte_eal/bsdapp/eal/eal_timer.c new file mode 100755 index 00000000..3e698647 --- /dev/null +++ b/src/dpdk_lib18/librte_eal/bsdapp/eal/eal_timer.c @@ -0,0 +1,149 @@ +/*- + * 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. + */ + +#if 0 + +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include <inttypes.h> +//#include <sys/types.h> +//#include <sys/sysctl.h> +#include <errno.h> + + +#include <rte_common.h> +#include <rte_log.h> +#include <rte_cycles.h> +#include <rte_tailq.h> +#include <rte_memory.h> +#include <rte_memzone.h> +#include <rte_eal.h> +#include <rte_debug.h> + +#include "eal_private.h" +#include "eal_internal_cfg.h" + +#ifdef RTE_LIBEAL_USE_HPET +#error "should not be enabled" +//#warning HPET is not supported in FreeBSD +#endif + +enum timer_source eal_timer_source = EAL_TIMER_TSC; + +/* The frequency of the RDTSC timer resolution */ +static uint64_t eal_tsc_resolution_hz = 0; + +void +rte_delay_us(unsigned us) +{ + const uint64_t start = rte_get_timer_cycles(); + const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6; + while ((rte_get_timer_cycles() - start) < ticks) + rte_pause(); +} + +uint64_t +rte_get_tsc_hz(void) +{ + return eal_tsc_resolution_hz; +} + +#if 0 +static int +set_tsc_freq_from_sysctl(void) +{ + size_t sz; + int tmp; + + sz = sizeof(tmp); + tmp = 0; + + if (sysctlbyname("kern.timecounter.smp_tsc", &tmp, &sz, NULL, 0)) + RTE_LOG(WARNING, EAL, "%s\n", strerror(errno)); + else if (tmp != 1) + RTE_LOG(WARNING, EAL, "TSC is not safe to use in SMP mode\n"); + + tmp = 0; + + if (sysctlbyname("kern.timecounter.invariant_tsc", &tmp, &sz, NULL, 0)) + RTE_LOG(WARNING, EAL, "%s\n", strerror(errno)); + else if (tmp != 1) + RTE_LOG(WARNING, EAL, "TSC is not invariant\n"); + + sz = sizeof(eal_tsc_resolution_hz); + if (sysctlbyname("machdep.tsc_freq", &eal_tsc_resolution_hz, &sz, NULL, 0)) { + RTE_LOG(WARNING, EAL, "%s\n", strerror(errno)); + return -1; + } + + return 0; +} +#endif + +static void +set_tsc_freq_fallback(void) +{ + RTE_LOG(WARNING, EAL, "WARNING: clock_gettime cannot use " + "CLOCK_MONOTONIC_RAW and HPET is not available" + " - clock timings may be less accurate.\n"); + /* assume that the sleep(1) will sleep for 1 second */ + uint64_t start = rte_rdtsc(); + sleep(1); + eal_tsc_resolution_hz = rte_rdtsc() - start; +} + +/* + * This function measures the TSC frequency. It uses a variety of approaches. + * + * 1. Read the TSC frequency value provided by the kernel + * 2. If above does not work, just sleep for 1 second and tune off that, + * printing a warning about inaccuracy of timing + */ +static void +set_tsc_freq(void) +{ + //if (set_tsc_freq_from_sysctl() < 0) + set_tsc_freq_fallback(); + + RTE_LOG(INFO, EAL, "TSC frequency is ~%"PRIu64" KHz\n", + eal_tsc_resolution_hz/1000); +} + +int +rte_eal_timer_init(void) +{ + set_tsc_freq(); + return 0; +} +#endif |