v4.19.13 snapshot.
diff --git a/net/caif/cfdbgl.c b/net/caif/cfdbgl.c
new file mode 100644
index 0000000..7aae0b5
--- /dev/null
+++ b/net/caif/cfdbgl.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Author: Sjur Brendeland
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
+
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <net/caif/caif_layer.h>
+#include <net/caif/cfsrvl.h>
+#include <net/caif/cfpkt.h>
+
+#define container_obj(layr) ((struct cfsrvl *) layr)
+
+static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt);
+static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt);
+
+struct cflayer *cfdbgl_create(u8 channel_id, struct dev_info *dev_info)
+{
+ struct cfsrvl *dbg = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
+ if (!dbg)
+ return NULL;
+ caif_assert(offsetof(struct cfsrvl, layer) == 0);
+ cfsrvl_init(dbg, channel_id, dev_info, false);
+ dbg->layer.receive = cfdbgl_receive;
+ dbg->layer.transmit = cfdbgl_transmit;
+ snprintf(dbg->layer.name, CAIF_LAYER_NAME_SZ - 1, "dbg%d", channel_id);
+ return &dbg->layer;
+}
+
+static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt)
+{
+ return layr->up->receive(layr->up, pkt);
+}
+
+static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt)
+{
+ struct cfsrvl *service = container_obj(layr);
+ struct caif_payload_info *info;
+ int ret;
+
+ if (!cfsrvl_ready(service, &ret)) {
+ cfpkt_destroy(pkt);
+ return ret;
+ }
+
+ /* Add info for MUX-layer to route the packet out */
+ info = cfpkt_info(pkt);
+ info->channel_id = service->layer.id;
+ info->dev_info = &service->dev_info;
+
+ return layr->dn->transmit(layr->dn, pkt);
+}