+static void
+parse_controller(struct ofpbuf *b, char *arg)
+{
+ enum ofp_packet_in_reason reason = OFPR_ACTION;
+ uint16_t controller_id = 0;
+ uint16_t max_len = UINT16_MAX;
+
+ if (!arg[0]) {
+ /* Use defaults. */
+ } else if (strspn(arg, "0123456789") == strlen(arg)) {
+ max_len = str_to_u16(arg, "max_len");
+ } else {
+ char *name, *value;
+
+ while (ofputil_parse_key_value(&arg, &name, &value)) {
+ if (!strcmp(name, "reason")) {
+ if (!ofputil_packet_in_reason_from_string(value, &reason)) {
+ ovs_fatal(0, "unknown reason \"%s\"", value);
+ }
+ } else if (!strcmp(name, "max_len")) {
+ max_len = str_to_u16(value, "max_len");
+ } else if (!strcmp(name, "id")) {
+ controller_id = str_to_u16(value, "id");
+ } else {
+ ovs_fatal(0, "unknown key \"%s\" parsing controller action",
+ name);
+ }
+ }
+ }
+
+ if (reason == OFPR_ACTION && controller_id == 0) {
+ put_output_action(b, OFPP_CONTROLLER)->max_len = htons(max_len);
+ } else {
+ struct nx_action_controller *nac;
+
+ nac = ofputil_put_NXAST_CONTROLLER(b);
+ nac->max_len = htons(max_len);
+ nac->reason = reason;
+ nac->controller_id = htons(controller_id);
+ }
+}
+