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/* Copyright (c) 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License. */
#ifndef OFPROTO_DPIF_UPCALL_H
#define OFPROTO_DPIF_UPCALL_H
#define FLOW_MISS_MAX_BATCH 50
#include "dpif.h"
#include "flow.h"
#include "hmap.h"
#include "list.h"
#include "odp-util.h"
#include "ofpbuf.h"
#include "ofproto-dpif-xlate.h"
struct dpif;
struct dpif_backer;
/* udif is responsible for retrieving upcalls from the kernel, processing miss
* upcalls, and handing more complex ones up to the main ofproto-dpif
* module. */
struct udpif *udpif_create(struct dpif_backer *, struct dpif *);
void udpif_set_threads(struct udpif *, size_t n_handlers);
void udpif_destroy(struct udpif *);
void udpif_wait(struct udpif *);
void udpif_revalidate(struct udpif *);
void udpif_get_memory_usage(struct udpif *, struct simap *usage);
/* udpif figures out how to forward packets, and does forward them, but it
* can't set up datapath flows on its own. This interface passes packet
* forwarding data from udpif to the higher level ofproto_dpif to allow the
* latter to set up datapath flows. */
/* Flow miss batching.
*
* Some dpifs implement operations faster when you hand them off in a batch.
* To allow batching, "struct flow_miss" queues the dpif-related work needed
* for a given flow. Each "struct flow_miss" corresponds to sending one or
* more packets, plus possibly installing the flow in the dpif. */
struct flow_miss {
struct hmap_node hmap_node;
struct ofproto_dpif *ofproto;
struct flow flow;
enum odp_key_fitness key_fitness;
const struct nlattr *key;
size_t key_len;
enum dpif_upcall_type upcall_type;
struct dpif_flow_stats stats;
struct xlate_out xout;
};
struct flow_miss_batch {
struct list list_node;
struct flow_miss miss_buf[FLOW_MISS_MAX_BATCH];
struct hmap misses;
unsigned int reval_seq;
/* Flow misses refer to the memory held by "struct upcall"s,
* so we need to keep track of the upcalls to be able to
* free them when done. */
struct list upcalls; /* Contains "struct upcall"s. */
};
struct flow_miss_batch *flow_miss_batch_next(struct udpif *);
void flow_miss_batch_destroy(struct flow_miss_batch *);
/* Drop keys are odp flow keys which have drop flows installed in the kernel.
* These are datapath flows which have no associated ofproto, if they did we
* would use facets.
*
* udpif can't install drop flows by itself. This interfaces allows udpif to
* pass the drop flows up to ofproto_dpif to get it to install them. */
struct drop_key {
struct hmap_node hmap_node;
struct list list_node;
struct nlattr *key;
size_t key_len;
};
struct drop_key *drop_key_next(struct udpif *);
void drop_key_destroy(struct drop_key *);
void udpif_drop_key_clear(struct udpif *);
#endif /* ofproto-dpif-upcall.h */
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