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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2016-07-16 17:08:56 +0300
committerDavid S. Miller <davem@davemloft.net>2016-07-18 22:44:31 -0700
commit0564bf0afae443deeb16f36e2c39fefff89d05f2 (patch)
treec5e1ce04411e5a08980e5a5b7411632d893f1607 /net/sched
parent8e6ce7ebeb34f0992f56de078c3744fb383657fa (diff)
downloadlinux-0564bf0afae443deeb16f36e2c39fefff89d05f2.tar.bz2
net/sched/sch_htb: clamp xstats tokens to fit into 32-bit int
In kernel HTB keeps tokens in signed 64-bit in nanoseconds. In netlink protocol these values are converted into pshed ticks (64ns for now) and truncated to 32-bit. In struct tc_htb_xstats fields "tokens" and "ctokens" are declared as unsigned 32-bit but they could be negative thus tool 'tc' prints them as signed. Big values loose higher bits and/or become negative. This patch clamps tokens in xstat into range from INT_MIN to INT_MAX. In this way it's easier to understand what's going on here. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_htb.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 62f9d8100c6e..052f84d6cc23 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1140,8 +1140,10 @@ htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d)
if (!cl->level && cl->un.leaf.q)
qlen = cl->un.leaf.q->q.qlen;
- cl->xstats.tokens = PSCHED_NS2TICKS(cl->tokens);
- cl->xstats.ctokens = PSCHED_NS2TICKS(cl->ctokens);
+ cl->xstats.tokens = clamp_t(s64, PSCHED_NS2TICKS(cl->tokens),
+ INT_MIN, INT_MAX);
+ cl->xstats.ctokens = clamp_t(s64, PSCHED_NS2TICKS(cl->ctokens),
+ INT_MIN, INT_MAX);
if (gnet_stats_copy_basic(d, NULL, &cl->bstats) < 0 ||
gnet_stats_copy_rate_est(d, NULL, &cl->rate_est) < 0 ||