disable PHC switch with vclocks (#2066452)

Resolves: #2066452

linuxptp-vclock.patch

@@ -1,3 +1,5 @@
+Patches backported from the upstream repository.
+
 commit 6d2e07353d042b845da60dc6e3a20a71932678d0
 Author: Miroslav Lichvar <mlichvar@redhat.com>
 Date:   Tue Mar 8 11:46:58 2022 +0100
@@ -1505,3 +1507,32 @@ index 1fbadcb..287d77c 100644
  
  	if (section_name)
  		free(section_name);
+commit 5f402a959959edc7248415a98581f3eaab3c9735
+Author: Miroslav Lichvar <mlichvar@redhat.com>
+Date:   Thu Jul 14 17:06:15 2022 +0200
+
+    port: Disable PHC switch with vclocks.
+    
+    With a virtual PHC, don't try to switch to the physical PHC after a
+    link-state change. JBOD and other multi-PHC configurations are not
+    supported with vclocks yet.
+    
+    Fixes: 9b9c2c58e6ed ("port: Check for virtual clocks.")
+    
+    Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
+
+diff --git a/port.c b/port.c
+index e309b98..70b6e60 100644
+--- a/port.c
++++ b/port.c
+@@ -2591,8 +2591,9 @@ void port_link_status(void *ctx, int linkup, int ts_index)
+ 	    (p->link_status & LINK_STATE_CHANGED || p->link_status & TS_LABEL_CHANGED)) {
+ 		interface_get_tsinfo(p->iface);
+ 
+-		/* Only switch phc with HW time stamping mode */
++		/* Only switch a non-vclock PHC with HW time stamping. */
+ 		if (interface_tsinfo_valid(p->iface) &&
++		    interface_get_vclock(p->iface) < 0 &&
+ 		    interface_phc_index(p->iface) >= 0) {
+ 			required_modes = clock_required_modes(p->clock);
+ 			if (!interface_tsmodes_supported(p->iface, required_modes)) {