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>

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 621c6ac..8b54b10 100644 (file)
--- 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;
        }