[V5] SA Busy Handling

Commit Message

Michael Heinz Dec. 3, 2010, 9:57 p.m. UTC

None

Patch

diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index 64e660c..b322173 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -1828,6 +1828,9 @@  static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
 
 	/* Complete corresponding request */
 	if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
+		u16 busy = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.status) &
+							   IB_MGMT_MAD_STATUS_BUSY;
+
 		spin_lock_irqsave(&mad_agent_priv->lock, flags);
 		mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
 		if (!mad_send_wr) {
@@ -1836,6 +1839,16 @@  static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
 			deref_mad_agent(mad_agent_priv);
 			return;
 		}
+
+		if (busy && mad_send_wr->retries_left &&
+		   (mad_recv_wc->recv_buf.mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)) {
+			/* Just let the query timeout and have it requeued later */
+			spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
+			ib_free_recv_mad(mad_recv_wc);
+			deref_mad_agent(mad_agent_priv);
+			return;
+		}
+
 		ib_mark_mad_done(mad_send_wr);
 		spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 
diff --git a/include/rdma/ib_mad.h b/include/rdma/ib_mad.h
index d3b9401..b901968 100644
--- a/include/rdma/ib_mad.h
+++ b/include/rdma/ib_mad.h
@@ -77,6 +77,15 @@ 
 
 #define IB_MGMT_MAX_METHODS			128
 
+/* MAD Status field bit masks */
+#define IB_MGMT_MAD_STATUS_SUCCESS                      0x0000
+#define IB_MGMT_MAD_STATUS_BUSY                         0x0001
+#define IB_MGMT_MAD_STATUS_REDIRECT_REQD                0x0002
+#define IB_MGMT_MAD_STATUS_BAD_VERSION                  0x0004
+#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD           0x0008
+#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB    0x000c
+#define IB_MGMT_MAD_STATUS_INVALID_ATTRIB_VALUE         0x001c
+
 /* RMPP information */
 #define IB_MGMT_RMPP_VERSION			1