[PATCH] IB/ipath: fixes to performance get counters for IB compliance

This patch fixes some problems uncovered during IB compliance testing to
return the right values for error counters returned by the Performance Get
Counters packet.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Cc: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/infiniband/hw/ipath/ipath_ud.c

@@ -560,7 +560,16 @@ void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
 	spin_lock_irqsave(&rq->lock, flags);
 	if (rq->tail == rq->head) {
 		spin_unlock_irqrestore(&rq->lock, flags);
-		dev->n_pkt_drops++;
+		/*
+		 * Count VL15 packets dropped due to no receive buffer.
+		 * Otherwise, count them as buffer overruns since usually,
+		 * the HW will be able to receive packets even if there are
+		 * no QPs with posted receive buffers.
+		 */
+		if (qp->ibqp.qp_num == 0)
+			dev->n_vl15_dropped++;
+		else
+			dev->rcv_errors++;
 		goto bail;
 	}
 	/* Silently drop packets which are too big. */