[PATCH infiniband-diags] ibtracert.c: Remove checking the port 0 state for BasePort0 switches

[Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>]

From: Dan Ben Yosef <danby-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

The port 0 state check is needed only for HCA/Routers and
EnhancedPort0 switches.

For BasePort0 switches, the PortState field in the PortInfo attribute
for port0 is undefined (not used).

Signed-off-by: Dan Ben Yosef <danby-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
 src/ibtracert.c |   47 ++++++++++++++++++++++++++++++++++++++++-------
 1 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/src/ibtracert.c b/src/ibtracert.c
index d32968b..326200b 100644
--- a/src/ibtracert.c
+++ b/src/ibtracert.c
@@ -92,6 +92,7 @@ struct Switch {
 	int mccap;
 	int linearFDBtop;
 	int fdb_base;
+	int enhsp0;
 	int8_t fdb[64];
 	char switchinfo[64];
 };
@@ -114,6 +115,17 @@ struct Node {
 Node *nodesdist[MAXHOPS];
 uint64_t target_portguid;
 
+static int is_route_inactive_port0(Node * node, Port * port, Switch * sw)
+{
+	int res = 0;
+	/* not active for HCA and for enhanced port0 Switches */
+	if (port->state != 4 &&
+	    (node->type != IB_NODE_SWITCH ||
+	     (node->type == IB_NODE_SWITCH && sw->enhsp0)))
+		res = 1;
+	return res;
+}
+
 static int get_node(Node * node, Port * port, ib_portid_t * portid)
 {
 	void *pi = port->portinfo, *ni = node->nodeinfo, *nd = node->nodedesc;
@@ -164,6 +176,7 @@ static int switch_lookup(Switch * sw, ib_portid_t * portid, int lid)
 
 	mad_decode_field(si, IB_SW_LINEAR_FDB_CAP_F, &sw->linearcap);
 	mad_decode_field(si, IB_SW_LINEAR_FDB_TOP_F, &sw->linearFDBtop);
+	mad_decode_field(si, IB_SW_ENHANCED_PORT0_F, &sw->enhsp0);
 
 	if (lid >= sw->linearcap && lid > sw->linearFDBtop)
 		return -1;
@@ -248,7 +261,7 @@ static int find_route(ib_portid_t * from, ib_portid_t * to, int dump)
 	Port *port, fromport, toport, nextport;
 	Switch sw;
 	int maxhops = MAXHOPS;
-	int portnum, outport;
+	int portnum, outport = 255, next_sw_outport = 255;
 
 	memset(&fromnode,0,sizeof(Node));
 	memset(&tonode,0,sizeof(Node));
@@ -274,20 +287,28 @@ static int find_route(ib_portid_t * from, ib_portid_t * to, int dump)
 	portnum = port->portnum;
 
 	dump_endnode(dump, "From", node, port);
+	if (node->type == IB_NODE_SWITCH) {
+		next_sw_outport = switch_lookup(&sw, from, to->lid);
+		if (next_sw_outport < 0 || next_sw_outport > node->numports) {
+			/* needed to print the port in badtbl */
+			outport = next_sw_outport;
+			goto badtbl;
+		}
+	}
 
 	while (maxhops--) {
-		if (port->state != 4)
+		/* checking if the port state isn't active.
+		 * The "sw" argument is only relevant when the port is a
+		 * switch port for HCAs this argument is ignored */
+		if (is_route_inactive_port0(node, port, &sw))
 			goto badport;
 
 		if (sameport(port, &toport))
 			break;	/* found */
 
-		outport = portnum;
 		if (node->type == IB_NODE_SWITCH) {
 			DEBUG("switch node");
-			if ((outport = switch_lookup(&sw, from, to->lid)) < 0 ||
-			    outport > node->numports)
-				goto badtbl;
+			outport = next_sw_outport;
 
 			if (extend_dpath(&from->drpath, outport) < 0)
 				goto badpath;
@@ -307,6 +328,7 @@ static int find_route(ib_portid_t * from, ib_portid_t * to, int dump)
 			   (node->type == IB_NODE_ROUTER)) {
 			int ca_src = 0;
 
+			outport = portnum;
 			DEBUG("ca or router node");
 			if (!sameport(port, &fromport)) {
 				IBWARN
@@ -335,8 +357,19 @@ static int find_route(ib_portid_t * from, ib_portid_t * to, int dump)
 				nextport.portnum =
 				    from->drpath.p[from->drpath.cnt + 1];
 		}
+		/* only if the next node is a switch, get switch info */
+		if (nextnode.type == IB_NODE_SWITCH) {
+			next_sw_outport = switch_lookup(&sw, from, to->lid);
+			if (next_sw_outport < 0 ||
+			    next_sw_outport > nextnode.numports) {
+				/* needed to print the port in badtbl */
+				outport = next_sw_outport;
+				goto badtbl;
+			}
+		}
+
 		port = &nextport;
-		if (port->state != 4)
+		if (is_route_inactive_port0(&nextnode, port, &sw))
 			goto badoutport;
 		node = &nextnode;
 		portnum = port->portnum;
-- 
1.7.8.2

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