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openvswitch: meter: fix the incorrect calculation of max delta_t
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Max delat_t should be the full_bucket/rate instead of the full_bucket.
Also report EINVAL if the rate is zero.

Fixes: 96fbc13 ("openvswitch: Add meter infrastructure")
Cc: Andy Zhou <azhou@ovn.org>
Signed-off-by: zhangliping <zhangliping02@baidu.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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zhangliping authored and David S. Miller committed Mar 12, 2018
1 parent 13fbcc8 commit ddc502d
Showing 1 changed file with 9 additions and 3 deletions.
12 changes: 9 additions & 3 deletions net/openvswitch/meter.c
Original file line number Diff line number Diff line change
Expand Up @@ -242,14 +242,20 @@ static struct dp_meter *dp_meter_create(struct nlattr **a)

band->type = nla_get_u32(attr[OVS_BAND_ATTR_TYPE]);
band->rate = nla_get_u32(attr[OVS_BAND_ATTR_RATE]);
if (band->rate == 0) {
err = -EINVAL;
goto exit_free_meter;
}

band->burst_size = nla_get_u32(attr[OVS_BAND_ATTR_BURST]);
/* Figure out max delta_t that is enough to fill any bucket.
* Keep max_delta_t size to the bucket units:
* pkts => 1/1000 packets, kilobits => bits.
*
* Start with a full bucket.
*/
band_max_delta_t = (band->burst_size + band->rate) * 1000;
/* Start with a full bucket. */
band->bucket = band_max_delta_t;
band->bucket = (band->burst_size + band->rate) * 1000;
band_max_delta_t = band->bucket / band->rate;
if (band_max_delta_t > meter->max_delta_t)
meter->max_delta_t = band_max_delta_t;
band++;
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