I finally found a good use for hard timeouts in OpenFlow, but they require
a slight reinterpretation of the meaning of hard timeouts. Until now, a
hard timeout meant that a flow would be removed the specified number of
seconds after a flow was created. Intervening modifications with
OFPFC_MODIFY(_STRICT) had no effect on the hard timeout; the flow would
still be deleted the specified number of seconds after its original
creation.
This commit changes the effect of OFPFC_MODIFY(_STRICT). Now, modifying
a flow resets its hard timeout counter. A flow will time out the specified
number of seconds after creation or after the last time it is modified,
whichever comes later.
---
ofproto/ofproto-dpif.c | 2 +-
ofproto/ofproto-provider.h | 3 ++-
ofproto/ofproto.c | 8 ++++++--
3 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c
index 3130da4..2669bf0 100644
--- a/ofproto/ofproto-dpif.c
+++ b/ofproto/ofproto-dpif.c
@@ -1992,7 +1992,7 @@ rule_expire(struct rule_dpif *rule)
/* Has 'rule' expired? */
now = time_msec();
if (rule->up.hard_timeout
- && now > rule->up.created + rule->up.hard_timeout * 1000) {
+ && now > rule->up.modified + rule->up.hard_timeout * 1000) {
reason = OFPRR_HARD_TIMEOUT;
} else if (rule->up.idle_timeout && list_is_empty(&rule->facets)
&& now > rule->used + rule->up.idle_timeout * 1000) {
diff --git a/ofproto/ofproto-provider.h b/ofproto/ofproto-provider.h
index 9c53657..e56c8d1 100644
--- a/ofproto/ofproto-provider.h
+++ b/ofproto/ofproto-provider.h
@@ -106,8 +106,9 @@ struct rule {
ovs_be64 flow_cookie; /* Controller-issued identifier. */
long long int created; /* Creation time. */
+ long long int modified; /* Time of last modification. */
uint16_t idle_timeout; /* In seconds from time of last use. */
- uint16_t hard_timeout; /* In seconds from time of creation. */
+ uint16_t hard_timeout; /* In seconds from last modification. */
uint8_t table_id; /* Index in ofproto's 'tables' array. */
bool send_flow_removed; /* Send a flow removed message? */
diff --git a/ofproto/ofproto.c b/ofproto/ofproto.c
index d35e1d8..b7e31d2 100644
--- a/ofproto/ofproto.c
+++ b/ofproto/ofproto.c
@@ -2233,7 +2233,7 @@ add_flow(struct ofproto *ofproto, struct ofconn *ofconn,
rule->cr = fm->cr;
rule->pending = NULL;
rule->flow_cookie = fm->cookie;
- rule->created = time_msec();
+ rule->created = rule->modified = time_msec();
rule->idle_timeout = fm->idle_timeout;
rule->hard_timeout = fm->hard_timeout;
rule->table_id = table - ofproto->tables;
@@ -2296,6 +2296,8 @@ modify_flows__(struct ofproto *ofproto, struct ofconn
*ofconn,
rule->actions = ofputil_actions_clone(fm->actions, fm->n_actions);
rule->n_actions = fm->n_actions;
rule->ofproto->ofproto_class->rule_modify_actions(rule);
+ } else {
+ rule->modified = time_msec();
}
rule->flow_cookie = fm->cookie;
}
@@ -2904,7 +2906,9 @@ ofoperation_complete(struct ofoperation *op, int error)
break;
case OFOPERATION_MODIFY:
- if (error) {
+ if (!error) {
+ rule->modified = time_msec();
+ } else {
free(rule->actions);
rule->actions = op->actions;
rule->n_actions = op->n_actions;
--
1.7.4.4
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