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authorFrançois Michel <francois.michel@uclouvain.be>2023-08-15 11:23:38 +0200
committerJakub Kicinski <kuba@kernel.org>2023-08-17 19:15:05 -0700
commit4072d97ddc447ce9dd8f7a39cdf6f92d2031bb01 (patch)
tree87096da91c4853b507a2aa966892cd3f876c9622 /net
parenta5e5b2cd47bc7ac853b3ae9d4af97d08caaf585d (diff)
netem: add prng attribute to netem_sched_data
Add prng attribute to struct netem_sched_data and allows setting the seed of the PRNG through netlink using the new TCA_NETEM_PRNG_SEED attribute. The PRNG attribute is not actually used yet. 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/20230815092348.1449179-2-francois.michel@uclouvain.be Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/sched/sch_netem.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 38d9aa0cd30e..621c6acfd644 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -105,6 +105,11 @@ struct netem_sched_data {
u32 rho;
} delay_cor, loss_cor, dup_cor, reorder_cor, corrupt_cor;
+ struct prng {
+ u64 seed;
+ struct rnd_state prng_state;
+ } prng;
+
struct disttable *delay_dist;
enum {
@@ -922,6 +927,7 @@ static const struct nla_policy netem_policy[TCA_NETEM_MAX + 1] = {
[TCA_NETEM_LATENCY64] = { .type = NLA_S64 },
[TCA_NETEM_JITTER64] = { .type = NLA_S64 },
[TCA_NETEM_SLOT] = { .len = sizeof(struct tc_netem_slot) },
+ [TCA_NETEM_PRNG_SEED] = { .type = NLA_U64 },
};
static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
@@ -1040,6 +1046,12 @@ static int netem_change(struct Qdisc *sch, struct nlattr *opt,
/* capping jitter to the range acceptable by tabledist() */
q->jitter = min_t(s64, abs(q->jitter), INT_MAX);
+ if (tb[TCA_NETEM_PRNG_SEED])
+ q->prng.seed = nla_get_u64(tb[TCA_NETEM_PRNG_SEED]);
+ else
+ q->prng.seed = get_random_u64();
+ prandom_seed_state(&q->prng.prng_state, q->prng.seed);
+
unlock:
sch_tree_unlock(sch);
@@ -1203,6 +1215,10 @@ static int netem_dump(struct Qdisc *sch, struct sk_buff *skb)
goto nla_put_failure;
}
+ if (nla_put_u64_64bit(skb, TCA_NETEM_PRNG_SEED, q->prng.seed,
+ TCA_NETEM_PAD))
+ goto nla_put_failure;
+
return nla_nest_end(skb, nla);
nla_put_failure: