void
format_flags(struct ds *ds, const char *(*bit_to_string)(uint32_t),
uint32_t flags, char del)
{
uint32_t bad = 0;
if (!flags) {
return;
}
while (flags) {
uint32_t bit = rightmost_1bit(flags);
const char *s;
s = bit_to_string(bit);
if (s) {
ds_put_format(ds, "%s%c", s, del);
} else {
bad |= bit;
}
flags &= ~bit;
}
if (bad) {
ds_put_format(ds, "0x%"PRIx32"%c", bad, del);
}
ds_chomp(ds, del);
}
/* Returns a bitmap of OpenFlow versions that are supported by at
* least one of the 'protocols'. */
uint32_t
ofputil_protocols_to_version_bitmap(enum ofputil_protocol protocols)
{
uint32_t bitmap = 0;
for (; protocols; protocols = zero_rightmost_1bit(protocols)) {
enum ofputil_protocol protocol = rightmost_1bit(protocols);
bitmap |= 1u << ofputil_protocol_to_ofp_version(protocol);
}
return bitmap;
}
static void
lswitch_handshake(struct lswitch *sw)
{
enum ofputil_protocol protocol;
enum ofp_version version;
send_features_request(sw);
send_controller_id(sw);
version = rconn_get_version(sw->rconn);
protocol = ofputil_protocol_from_ofp_version(version);
if (sw->default_flows) {
struct ofpbuf *msg = NULL;
int error = 0;
size_t i;
if (!(protocol & sw->usable_protocols)) {
enum ofputil_protocol want = rightmost_1bit(sw->usable_protocols);
while (!error) {
msg = ofputil_encode_set_protocol(protocol, want, &protocol);
if (!msg) {
break;
}
error = rconn_send(sw->rconn, msg, NULL);
}
}
if (protocol & sw->usable_protocols) {
for (i = 0; !error && i < sw->n_default_flows; i++) {
msg = ofputil_encode_flow_mod(&sw->default_flows[i], protocol);
error = rconn_send(sw->rconn, msg, NULL);
}
if (error) {
VLOG_INFO_RL(&rl, "%s: failed to queue default flows (%s)",
rconn_get_name(sw->rconn), ovs_strerror(error));
}
} else {
VLOG_INFO_RL(&rl, "%s: failed to set usable protocol",
rconn_get_name(sw->rconn));
}
}
sw->protocol = protocol;
}
/* Returns the ofputil_protocol that is initially in effect on an OpenFlow
* connection that has negotiated the given 'version'. 'version' should
* normally be an 8-bit OpenFlow version identifier (e.g. 0x01 for OpenFlow
* 1.0, 0x02 for OpenFlow 1.1). Returns 0 if 'version' is not supported or
* outside the valid range. */
enum ofputil_protocol
ofputil_protocol_from_ofp_version(enum ofp_version version)
{
return rightmost_1bit(ofputil_protocols_from_ofp_version(version));
}