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/* Copyright (c) 2015, 2016 Red Hat, 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.
*/
#include <config.h>
#include "dirs.h"
#include "pinctrl.h"
#include "ofp-msgs.h"
#include "ofp-print.h"
#include "ofp-util.h"
#include "rconn.h"
#include "openvswitch/vlog.h"
#include "socket-util.h"
#include "vswitch-idl.h"
VLOG_DEFINE_THIS_MODULE(pinctrl);
/* OpenFlow connection to the switch. */
static struct rconn *swconn;
/* Last seen sequence number for 'swconn'. When this differs from
* rconn_get_connection_seqno(rconn), 'swconn' has reconnected. */
static unsigned int conn_seq_no;
void
pinctrl_init(void)
{
swconn = rconn_create(5, 0, DSCP_DEFAULT, 1 << OFP13_VERSION);
conn_seq_no = 0;
}
static ovs_be32
queue_msg(struct ofpbuf *msg)
{
const struct ofp_header *oh = msg->data;
ovs_be32 xid = oh->xid;
rconn_send(swconn, msg, NULL);
return xid;
}
static void
get_switch_config(struct rconn *swconn)
{
struct ofpbuf *request;
request = ofpraw_alloc(OFPRAW_OFPT_GET_CONFIG_REQUEST,
rconn_get_version(swconn), 0);
queue_msg(request);
}
static void
set_switch_config(struct rconn *swconn,
const struct ofputil_switch_config *config)
{
enum ofp_version version = rconn_get_version(swconn);
struct ofpbuf *request = ofputil_encode_set_config(config, version);
queue_msg(request);
}
static void
process_packet_in(struct controller_ctx *ctx OVS_UNUSED,
const struct ofp_header *msg)
{
struct ofputil_packet_in pin;
uint32_t buffer_id;
size_t total_len;
if (ofputil_decode_packet_in(msg, &pin, &total_len, &buffer_id) != 0) {
return;
}
if (pin.reason != OFPR_ACTION) {
return;
}
/* XXX : process the received packet */
}
static void
pinctrl_recv(struct controller_ctx *ctx, const struct ofp_header *oh,
enum ofptype type)
{
if (type == OFPTYPE_ECHO_REQUEST) {
queue_msg(make_echo_reply(oh));
} else if (type == OFPTYPE_GET_CONFIG_REPLY) {
struct ofputil_switch_config config;
ofputil_decode_get_config_reply(oh, &config);
config.miss_send_len = htons(UINT16_MAX);
set_switch_config(swconn, &config);
} else if (type == OFPTYPE_PACKET_IN) {
process_packet_in(ctx, oh);
} else if (type != OFPTYPE_ECHO_REPLY && type != OFPTYPE_BARRIER_REPLY) {
if (VLOG_IS_DBG_ENABLED()) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 300);
char *s = ofp_to_string(oh, ntohs(oh->length), 2);
VLOG_DBG_RL(&rl, "OpenFlow packet ignored: %s", s);
free(s);
}
}
}
void
pinctrl_run(struct controller_ctx *ctx, const struct ovsrec_bridge *br_int)
{
if (br_int) {
char *target;
target = xasprintf("unix:%s/%s.mgmt", ovs_rundir(), br_int->name);
if (strcmp(target, rconn_get_target(swconn))) {
VLOG_INFO("%s: connecting to switch", target);
rconn_connect(swconn, target, target);
}
free(target);
} else {
rconn_disconnect(swconn);
}
rconn_run(swconn);
if (!rconn_is_connected(swconn)) {
return;
}
if (conn_seq_no != rconn_get_connection_seqno(swconn)) {
get_switch_config(swconn);
conn_seq_no = rconn_get_connection_seqno(swconn);
}
struct ofpbuf *msg = rconn_recv(swconn);
if (!msg) {
return;
}
const struct ofp_header *oh = msg->data;
enum ofptype type;
ofptype_decode(&type, oh);
pinctrl_recv(ctx, oh, type);
ofpbuf_delete(msg);
}
void
pinctrl_wait(void)
{
rconn_run_wait(swconn);
rconn_recv_wait(swconn);
}
void
pinctrl_destroy(void)
{
rconn_destroy(swconn);
}
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