l1ctl protocol: Introduce multi-part message DONE flag

In case a single request from L2 triggers multiple response messages
from L1, we need a way to signal via L1CTL if the response is the
final or some intermediate response.

3 files changed, 9 insertions, 1 deletions

diff --git a/include/l1a_l23_interface.h b/include/l1a_l23_interface.h
index e9def59c..690a6baa 100644
--- a/include/l1a_l23_interface.h
+++ b/include/l1a_l23_interface.h
@@ -41,9 +41,12 @@
  * that it will avoid some unaligned access.
  */
 
+/* there are no more messages in a sequence */
+#define L1CTL_F_DONE	0x01
+
 struct l1ctl_hdr {
 	uint8_t msg_type;
-	uint8_t padding;
+	uint8_t flags;
 	uint8_t data[0];
 } __attribute__((packed));
 
diff --git a/src/target/firmware/layer1/l23_api.c b/src/target/firmware/layer1/l23_api.c
index d17c8c46..a48ea9d8 100644
--- a/src/target/firmware/layer1/l23_api.c
+++ b/src/target/firmware/layer1/l23_api.c
@@ -94,6 +94,9 @@ struct msgb *l1ctl_msgb_alloc(uint8_t msg_type)
 	}
 	l1h = (struct l1ctl_hdr *) msgb_put(msg, sizeof(*l1h));
 	l1h->msg_type = msg_type;
+	l1h->flags = 0;
+
+	msg->l1h = l1h;
 
 	return msg;
 }
diff --git a/src/target/firmware/layer1/sync.c b/src/target/firmware/layer1/sync.c
index f100ff5d..dfdf64e2 100644
--- a/src/target/firmware/layer1/sync.c
+++ b/src/target/firmware/layer1/sync.c
@@ -820,6 +820,8 @@ static int l1s_pm_resp(__unused uint8_t p1, __unused uint8_t p2,
 			l1s.pm.range.arfcn_next++;
 		} else {
 			/* we have finished, flush the msgb to L2 */
+			struct l1ctl_hdr *l1h = l1s.pm.msg->l1h;
+			l1h->flags |= L1CTL_F_DONE;
 			l1_queue_for_l2(l1s.pm.msg);
 			l1s.pm.msg = NULL;
 		}