if_re: Generate an address if there is none in the EEPROM

There exists hardware that has no ethernet address burned into
the EEPROM. Loading if_re on such a HW brings the device up
with '00:00:00:00:00:00' as the address, and that doesn't get
you too far in a real network.

PR: 262406
Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/670
Signed-off-by: Evgeni Golov <evgeni@debian.org>
Differential Revision: https://reviews.freebsd.org/D34485

sys/dev/re/if_re.c

@@ -1674,6 +1674,11 @@ re_attach(device_t dev)
 		goto fail;
 	}
 
+	/* If address was not found, create one based on the hostid and name. */
+	if (ETHER_IS_ZERO(eaddr)) {
+		ether_gen_addr(ifp, (struct ether_addr *)eaddr);
+	}
+
 	/*
 	 * Call MI attach routine.
 	 */