diff options
| author | François Michel <francois.michel@uclouvain.be> | 2023-08-15 11:23:39 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-08-17 19:15:05 -0700 |
| commit | 9c87b2aeccf174bce220e527d48391439981273b (patch) | |
| tree | 20b51823c6840055659ef4fd5b162d5c1f622cc8 /net | |
| parent | 4072d97ddc447ce9dd8f7a39cdf6f92d2031bb01 (diff) | |
netem: use a seeded PRNG for generating random losses
Use prandom_u32_state() instead of get_random_u32() to generate
the random loss events of netem. The state of the prng is part
of the prng attribute of struct netem_sched_data.
Signed-off-by: François Michel <francois.michel@uclouvain.be>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Link: https://lore.kernel.org/r/20230815092348.1449179-3-francois.michel@uclouvain.be
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_netem.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 621c6acfd644..8b54b1005a10 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -206,7 +206,7 @@ static u32 get_crandom(struct crndstate *state) static bool loss_4state(struct netem_sched_data *q) { struct clgstate *clg = &q->clg; - u32 rnd = get_random_u32(); + u32 rnd = prandom_u32_state(&q->prng.prng_state); /* * Makes a comparison between rnd and the transition @@ -271,18 +271,19 @@ static bool loss_4state(struct netem_sched_data *q) static bool loss_gilb_ell(struct netem_sched_data *q) { struct clgstate *clg = &q->clg; + struct rnd_state *s = &q->prng.prng_state; switch (clg->state) { case GOOD_STATE: - if (get_random_u32() < clg->a1) + if (prandom_u32_state(s) < clg->a1) clg->state = BAD_STATE; - if (get_random_u32() < clg->a4) + if (prandom_u32_state(s) < clg->a4) return true; break; case BAD_STATE: - if (get_random_u32() < clg->a2) + if (prandom_u32_state(s) < clg->a2) clg->state = GOOD_STATE; - if (get_random_u32() > clg->a3) + if (prandom_u32_state(s) > clg->a3) return true; } |