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From: xiangxia.m.yue@gmail.com
To: mattias.ronnblom@ericsson.com, david.marchand@redhat.com
Cc: dev@dpdk.org, Tonghao Zhang <xiangxia.m.yue@gmail.com>, stable@dpdk.org
Subject: [dpdk-dev] [PATCH v2] eal: fix crash when the random init
Date: Wed, 15 Apr 2020 15:43:35 +0800	[thread overview]
Message-ID: <1586936615-35033-1-git-send-email-xiangxia.m.yue@gmail.com> (raw)
In-Reply-To: <586680073-11075-1-git-send-email-xiangxia.m.yue@gmail.com>

From: Tonghao Zhang <xiangxia.m.yue@gmail.com>

When rte_rand_init is invoked, and the kernel running dpdk does't
support *getentropy, at the same time, the cpu does't support rdseed,
then rte_rand_init invoked rte_get_timer_cycles which invoked
rte_get_hpet_cycles while *eal_hpet is not available.

To fix that, use rte_get_tsc_cycles instread of rte_get_timer_cycles.

Fixes: faf8fd252785 ("eal: improve entropy for initial PRNG seed")
Fixes: 3f002f069612 ("eal: replace libc-based random generation with LFSR")

Cc: stable@dpdk.org

Reported-by: Ravi Kerur <rkerur@gmail.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
---
v2:
* use rte_get_tsc_cycles instread of rte_get_timer_cycles

---
 lib/librte_eal/common/rte_random.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/rte_random.c b/lib/librte_eal/common/rte_random.c
index 57ec8fb2b3dd..b7a089ac4fe0 100644
--- a/lib/librte_eal/common/rte_random.c
+++ b/lib/librte_eal/common/rte_random.c
@@ -198,7 +198,7 @@ struct rte_rand_state *__rte_rand_get_state(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)
-- 
1.8.3.1


       reply	other threads:[~2020-04-16 14:04 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <586680073-11075-1-git-send-email-xiangxia.m.yue@gmail.com>
2020-04-15  7:43 ` xiangxia.m.yue [this message]
2020-04-16 16:12   ` Mattias Rönnblom
2020-04-15 17:41 ` [dpdk-dev] [PATCH v3] " xiangxia.m.yue
2020-04-21 16:17   ` David Marchand

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