eal: fix PRNG init with HPET enabled

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: 3f002f069612 ("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>

diff --git a/lib/librte_eal/common/rte_random.c b/lib/librte_eal/common/rte_random.c
index 57ec8fb..b7a089a 100644 (file)
--- a/lib/librte_eal/common/rte_random.c
+++ b/lib/librte_eal/common/rte_random.c
@@ -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)