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eal: fix PRNG init with HPET enabled

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When rte_rand_init is invoked, and the kernel running dpdk does not
support *getentropy, at the same time, the cpu does not support rdseed,
then rte_rand_init invoked rte_get_timer_cycles.

If HPET was enabled in the DPDK build (CONFIG_RTE_LIBEAL_USE_HPET=y) and
the system, rte_get_timer_cycles will invoke rte_get_hpet_cycles while
*eal_hpet is not available.

To fix that, use rte_get_tsc_cycles instead of rte_get_timer_cycles.

Fixes: 3f002f0696 ("eal: replace libc-based random generation with LFSR")
Cc: stable@dpdk.org

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
This commit is contained in:
Tonghao Zhang 2020-04-16 01:41:06 +08:00 committed by David Marchand
parent 56b27c4b36
commit 9b41c276fd
1 changed files with 1 additions and 1 deletions
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2
lib/librte_eal/common/rte_random.c
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@ -198,7 +198,7 @@ __rte_random_initial_seed(void)
return (uint64_t)rdseed_low | ((uint64_t)rdseed_high << 32);
#endif
/* second fallback: seed using rdtsc */
return rte_get_timer_cycles();
return rte_get_tsc_cycles();
}
RTE_INIT(rte_rand_init)