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netem: use vmalloc for distribution table 

The netem probability table can be large (up to 64K bytes)
which may be too large to allocate in one contiguous chunk.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2011-02-23 13:04:18 +00:00 committed by David S. Miller
parent 861d7f745f
commit 6373a9a286
1 changed files with 18 additions and 4 deletions
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22
net/sched/sch_netem.c
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@ -308,6 +308,16 @@ static void netem_reset(struct Qdisc *sch)
qdisc_watchdog_cancel(&q->watchdog);
}
static void dist_free(struct disttable *d)
{
if (d) {
if (is_vmalloc_addr(d))
vfree(d);
else
kfree(d);
}
}
/*
* Distribution data is a variable size payload containing
* signed 16 bit values.
@ -315,16 +325,20 @@ static void netem_reset(struct Qdisc *sch)
static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
{
struct netem_sched_data *q = qdisc_priv(sch);
unsigned long n = nla_len(attr)/sizeof(__s16);
size_t n = nla_len(attr)/sizeof(__s16);
const __s16 *data = nla_data(attr);
spinlock_t *root_lock;
struct disttable *d;
int i;
size_t s;
if (n > 65536)
return -EINVAL;
d = kmalloc(sizeof(*d) + n*sizeof(d->table[0]), GFP_KERNEL);
s = sizeof(struct disttable) + n * sizeof(s16);
d = kmalloc(s, GFP_KERNEL);
if (!d)
d = vmalloc(s);
if (!d)
return -ENOMEM;
@ -335,7 +349,7 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
root_lock = qdisc_root_sleeping_lock(sch);
spin_lock_bh(root_lock);
kfree(q->delay_dist);
dist_free(q->delay_dist);
q->delay_dist = d;
spin_unlock_bh(root_lock);
return 0;
@ -556,7 +570,7 @@ static void netem_destroy(struct Qdisc *sch)
qdisc_watchdog_cancel(&q->watchdog);
qdisc_destroy(q->qdisc);
kfree(q->delay_dist);
dist_free(q->delay_dist);
}
static int netem_dump(struct Qdisc *sch, struct sk_buff *skb)