When multiple switches are unlinked and then a switch is relinked,
it should behave like a cable pull or power down of switch so it
depends on the state of the remote peer port (as to linked or not).
This is not represented in the IB port/port physical state and is
additional state.

Signed-off-by: Hal Rosenstock <hal.rosenstock@gmail.com>
---

diff --git a/ibsim/sim.h b/ibsim/sim.h
index bf85875..52eb73b 100644
--- a/ibsim/sim.h
+++ b/ibsim/sim.h
@@ -210,6 +211,7 @@ struct Port {
 	int remoteport;
 	Node *previous_remotenode;
 	int previous_remoteport;
+	int unlinked;
 	int errrate;
 	uint16_t errattr;
 	Node *node;
diff --git a/ibsim/sim_cmd.c b/ibsim/sim_cmd.c
index cb6e639..d27ab0f 100644
--- a/ibsim/sim_cmd.c
+++ b/ibsim/sim_cmd.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2004-2008 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2009 HNR Consulting. All rights reserved.
  *
  * This file is part of ibsim.
  *
@@ -146,12 +147,18 @@ static int do_link(FILE * f, char *line)
 
 	rport = node_get_port(rnode, rportnum);
 
+	if (rport->unlinked) {
+		lport->unlinked = 0;
+		return -1;
+	}
+
 	if (link_ports(lport, rport) < 0)
 		return -fprintf(f,
 				"# can't link: local/remote port are already connected\n");
 
 	lport->previous_remotenode = NULL;
 	rport->previous_remotenode = NULL;
+	lport->unlinked = 0;
 
 	return 0;
 }
@@ -194,7 +201,7 @@ static int do_relink(FILE * f, char *line)
 		numports++;	// To make the for-loop below run up to last port
 	else
 		lportnum--;
-	
+
 	if (lportnum >= 0) {
 		lport = ports + lnode->portsbase + lportnum;
 
@@ -206,12 +213,18 @@ static int do_relink(FILE * f, char *line)
 		rport = node_get_port(lport->previous_remotenode,
 				      lport->previous_remoteport);
 
+		if (rport->unlinked) {
+			lport->unlinked = 0;
+			return -1;
+		}
+
 		if (link_ports(lport, rport) < 0)
 			return -fprintf(f,
 					"# can't link: local/remote port are already connected\n");
 
 		lport->previous_remotenode = NULL;
 		rport->previous_remotenode = NULL;
+		lport->unlinked = 0;
 
 		return 1;
 	}
@@ -224,11 +237,17 @@ static int do_relink(FILE * f, char *line)
 		rport = node_get_port(lport->previous_remotenode,
 				      lport->previous_remoteport);
 
+		if (rport->unlinked) {
+			lport->unlinked = 0;
+			continue;
+		}
+
 		if (link_ports(lport, rport) < 0)
 			continue;
 
 		lport->previous_remotenode = NULL;
 		rport->previous_remotenode = NULL;
+		lport->unlinked = 0;
 
 		relinked++;
 	}
@@ -246,6 +265,7 @@ static void unlink_port(Node * lnode, Port * lport, Node * rnode, int rportnum)
 	lport->previous_remoteport = lport->remoteport;
 	rport->previous_remotenode = rport->remotenode;
 	rport->previous_remoteport = rport->remoteport;
+	lport->unlinked = 1;
 
 	lport->remotenode = rport->remotenode = 0;
 	lport->remoteport = rport->remoteport = 0;
@@ -406,6 +426,7 @@ static int do_unlink(FILE * f, char *line, int clear)
 	if (portnum >= 0) {
 		port = ports + node->portsbase + portnum;
 		if (!clear && !port->remotenode) {
+			port->unlinked = 1;
 			fprintf(f, "# port %d at nodeid \"%s\" is not linked\n",
 				portnum, nodeid);
 			return -1;
@@ -420,8 +441,10 @@ static int do_unlink(FILE * f, char *line, int clear)
 
 	for (port = ports + node->portsbase, e = port + numports; port < e;
 	     port++) {
-		if (!clear && !port->remotenode)
+		if (!clear && !port->remotenode) {
+			port->unlinked = 1;
 			continue;
+		}
 		if (port->remotenode)
 			unlink_port(node, port, port->remotenode,
 				    port->remoteport);
diff --git a/ibsim/sim_net.c b/ibsim/sim_net.c
index 8a5d281..0092068 100644
--- a/ibsim/sim_net.c
+++ b/ibsim/sim_net.c
@@ -492,6 +492,7 @@ static void init_ports(Node * node, int type, int maxports)
 		port->linkwidth = LINKWIDTH_4x;
 		port->linkspeedena = netspeed;
 		port->linkspeed = LINKSPEED_SDR;
+		port->unlinked = 0;
 
 		size = (type == SWITCH_NODE && i) ? sw_pkey_size : ca_pkey_size;
 		if (size) {
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