From fc0affcfd35cc52c69a37d3ab16e72edf27e75de Mon Sep 17 00:00:00 2001
From: Volker Diels-Grabsch <v@njh.eu>
Date: Tue, 16 Sep 2025 21:21:12 +0200
Subject: Show debug message whenever we observe a new guest MAC address

Signed-off-by: Volker Diels-Grabsch <v@njh.eu>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 tap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tap.c b/tap.c
index 7ba6399..cf862ef 100644
--- a/tap.c
+++ b/tap.c
@@ -1096,7 +1096,11 @@ void tap_add_packet(struct ctx *c, struct iov_tail *data,
 		return;
 
 	if (memcmp(c->guest_mac, eh->h_source, ETH_ALEN)) {
+		char bufmac[ETH_ADDRSTRLEN];
+
 		memcpy(c->guest_mac, eh->h_source, ETH_ALEN);
+		debug("New guest MAC address observed: %s",
+		      eth_ntop(c->guest_mac, bufmac, sizeof(bufmac)));
 		proto_update_l2_buf(c->guest_mac, NULL);
 	}
 
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