Messages in this thread Patch in this message | | | From | Francois Michel <> | Subject | [PATCH v2 net-next 2/3] netem: use a seeded PRNG for generating random losses | Date | Tue, 15 Aug 2023 11:23:39 +0200 |
| |
From: François Michel <francois.michel@uclouvain.be>
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> --- net/sched/sch_netem.c | 11 ++++++----- 1 file 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; } -- 2.41.0
| |