56 	return &dp->meters[meter_id & (METER_HASH_BUCKETS - 1)];  in meter_hash_bucket()
68 		if (meter->id == meter_id)  in lookup_meter()
76 	struct hlist_head *head = meter_hash_bucket(dp, meter->id);  in attach_meter()
78 	hlist_add_head_rcu(&meter->dp_hash_node, head);  in attach_meter()
85 		hlist_del_rcu(&meter->dp_hash_node);  in detach_meter()
93 	struct ovs_header *ovs_header = info->userhdr;  in ovs_meter_cmd_reply_start()
97 		return ERR_PTR(-ENOMEM);  in ovs_meter_cmd_reply_start()
99 	*ovs_reply_header = genlmsg_put(skb, info->snd_portid,  in ovs_meter_cmd_reply_start()
100 					info->snd_seq,  in ovs_meter_cmd_reply_start()
104 		return ERR_PTR(-EMSGSIZE);  in ovs_meter_cmd_reply_start()
106 	(*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;  in ovs_meter_cmd_reply_start()
115 	struct dp_meter_band *band;  in ovs_meter_cmd_reply_stats()  local
125 		    sizeof(struct ovs_flow_stats), &meter->stats) ||  in ovs_meter_cmd_reply_stats()
126 	    nla_put_u64_64bit(reply, OVS_METER_ATTR_USED, meter->used,  in ovs_meter_cmd_reply_stats()
134 	band = meter->bands;  in ovs_meter_cmd_reply_stats()
136 	for (i = 0; i < meter->n_bands; ++i, ++band) {  in ovs_meter_cmd_reply_stats()
142 					 &band->stats))  in ovs_meter_cmd_reply_stats()
150 	return -EMSGSIZE;  in ovs_meter_cmd_reply_stats()
176 	/* Currently only DROP band type is supported. */  in ovs_meter_cmd_features()
187 	err = -EMSGSIZE;  in ovs_meter_cmd_features()
197 	struct dp_meter_band *band;  in dp_meter_create()  local
202 		return ERR_PTR(-EINVAL);  in dp_meter_create()
206 			return ERR_PTR(-EINVAL);  in dp_meter_create()
212 		return ERR_PTR(-ENOMEM);  in dp_meter_create()
214 	meter->id = nla_get_u32(a[OVS_METER_ATTR_ID]);  in dp_meter_create()
215 	meter->used = div_u64(ktime_get_ns(), 1000 * 1000);  in dp_meter_create()
216 	meter->kbps = a[OVS_METER_ATTR_KBPS] ? 1 : 0;  in dp_meter_create()
217 	meter->keep_stats = !a[OVS_METER_ATTR_CLEAR];  in dp_meter_create()
218 	spin_lock_init(&meter->lock);  in dp_meter_create()
219 	if (meter->keep_stats && a[OVS_METER_ATTR_STATS]) {  in dp_meter_create()
220 		meter->stats = *(struct ovs_flow_stats *)  in dp_meter_create()
223 	meter->n_bands = n_bands;  in dp_meter_create()
226 	band = meter->bands;  in dp_meter_create()
240 			err = -EINVAL;  in dp_meter_create()
244 		band->type = nla_get_u32(attr[OVS_BAND_ATTR_TYPE]);  in dp_meter_create()
245 		band->rate = nla_get_u32(attr[OVS_BAND_ATTR_RATE]);  in dp_meter_create()
246 		if (band->rate == 0) {  in dp_meter_create()
247 			err = -EINVAL;  in dp_meter_create()
251 		band->burst_size = nla_get_u32(attr[OVS_BAND_ATTR_BURST]);  in dp_meter_create()
258 		band->bucket = (band->burst_size + band->rate) * 1000ULL;  in dp_meter_create()
259 		band_max_delta_t = div_u64(band->bucket, band->rate);  in dp_meter_create()
260 		if (band_max_delta_t > meter->max_delta_t)  in dp_meter_create()
261 			meter->max_delta_t = band_max_delta_t;  in dp_meter_create()
262 		band++;  in dp_meter_create()
274 	struct nlattr **a = info->attrs;  in ovs_meter_cmd_set()
278 	struct ovs_header *ovs_header = info->userhdr;  in ovs_meter_cmd_set()
285 		return -ENODEV;  in ovs_meter_cmd_set()
300 	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);  in ovs_meter_cmd_set()
302 		err = -ENODEV;  in ovs_meter_cmd_set()
320 		spin_lock_bh(&old_meter->lock);  in ovs_meter_cmd_set()
321 		if (old_meter->keep_stats) {  in ovs_meter_cmd_set()
326 		spin_unlock_bh(&old_meter->lock);  in ovs_meter_cmd_set()
343 	struct nlattr **a = info->attrs;  in ovs_meter_cmd_get()
345 	struct ovs_header *ovs_header = info->userhdr;  in ovs_meter_cmd_get()
353 		return -EINVAL;  in ovs_meter_cmd_get()
364 	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);  in ovs_meter_cmd_get()
366 		err = -ENODEV;  in ovs_meter_cmd_get()
373 		err = -ENOENT;  in ovs_meter_cmd_get()
377 	spin_lock_bh(&meter->lock);  in ovs_meter_cmd_get()
379 	spin_unlock_bh(&meter->lock);  in ovs_meter_cmd_get()
396 	struct nlattr **a = info->attrs;  in ovs_meter_cmd_del()
398 	struct ovs_header *ovs_header = info->userhdr;  in ovs_meter_cmd_del()
406 		return -EINVAL;  in ovs_meter_cmd_del()
416 	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);  in ovs_meter_cmd_del()
418 		err = -ENODEV;  in ovs_meter_cmd_del()
424 		spin_lock_bh(&old_meter->lock);  in ovs_meter_cmd_del()
427 		spin_unlock_bh(&old_meter->lock);  in ovs_meter_cmd_del()
443  * Return true 'meter_id' drop band is triggered. The 'skb' should be
450 	struct dp_meter_band *band;  in ovs_meter_execute()  local
455 	int i, band_exceeded_max = -1;  in ovs_meter_execute()
464 	spin_lock(&meter->lock);  in ovs_meter_execute()
466 	long_delta_ms = (now_ms - meter->used); /* ms */  in ovs_meter_execute()
471 	delta_ms = (long_delta_ms > (long long int)meter->max_delta_t)  in ovs_meter_execute()
472 		   ? meter->max_delta_t : (u32)long_delta_ms;  in ovs_meter_execute()
476 	meter->used = now_ms;  in ovs_meter_execute()
477 	meter->stats.n_packets += 1;  in ovs_meter_execute()
478 	meter->stats.n_bytes += skb->len;  in ovs_meter_execute()
480 	/* Bucket rate is either in kilobits per second, or in packets per  in ovs_meter_execute()
481 	 * second.  We maintain the bucket in the units of either bits or  in ovs_meter_execute()
488 	 * 'cost' is the number of bucket units in this packet.  in ovs_meter_execute()
490 	cost = (meter->kbps) ? skb->len * 8 : 1000;  in ovs_meter_execute()
493 	for (i = 0; i < meter->n_bands; ++i) {  in ovs_meter_execute()
496 		band = &meter->bands[i];  in ovs_meter_execute()
497 		max_bucket_size = (band->burst_size + band->rate) * 1000LL;  in ovs_meter_execute()
499 		band->bucket += delta_ms * band->rate;  in ovs_meter_execute()
500 		if (band->bucket > max_bucket_size)  in ovs_meter_execute()
501 			band->bucket = max_bucket_size;  in ovs_meter_execute()
503 		if (band->bucket >= cost) {  in ovs_meter_execute()
504 			band->bucket -= cost;  in ovs_meter_execute()
505 		} else if (band->rate > band_exceeded_rate) {  in ovs_meter_execute()
506 			band_exceeded_rate = band->rate;  in ovs_meter_execute()
512 		/* Update band statistics. */  in ovs_meter_execute()
513 		band = &meter->bands[band_exceeded_max];  in ovs_meter_execute()
514 		band->stats.n_packets += 1;  in ovs_meter_execute()
515 		band->stats.n_bytes += skb->len;  in ovs_meter_execute()
517 		/* Drop band triggered, let the caller drop the 'skb'.  */  in ovs_meter_execute()
518 		if (band->type == OVS_METER_BAND_TYPE_DROP) {  in ovs_meter_execute()
519 			spin_unlock(&meter->lock);  in ovs_meter_execute()
524 	spin_unlock(&meter->lock);  in ovs_meter_execute()
577 	dp->meters = kmalloc_array(METER_HASH_BUCKETS,  in ovs_meters_init()
580 	if (!dp->meters)  in ovs_meters_init()
581 		return -ENOMEM;  in ovs_meters_init()
584 		INIT_HLIST_HEAD(&dp->meters[i]);  in ovs_meters_init()
594 		struct hlist_head *head = &dp->meters[i];  in ovs_meters_exit()
602 	kfree(dp->meters);  in ovs_meters_exit()