IB/mad: Validate MADs for spec compliance

Validate MADs sent by userspace clients for spec compliance with
C13-18.1.1 (prevent duplicate requests and responses sent on the
same port).  Without this, RMPP transactions get aborted because
of duplicate packets.

This patch is similar to that provided by Jack Morgenstein.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/rdma/ib_mad.h b/include/rdma/ib_mad.h
index 5ff77558013b..585d28e960dd 100644
--- a/include/rdma/ib_mad.h
+++ b/include/rdma/ib_mad.h
@@ -75,6 +75,7 @@
 #define IB_MGMT_METHOD_TRAP_REPRESS             0x07
 
 #define IB_MGMT_METHOD_RESP                     0x80
+#define IB_BM_ATTR_MOD_RESP                     cpu_to_be32(1)
 
 #define IB_MGMT_MAX_METHODS                     128
 
@@ -247,6 +248,12 @@ struct ib_mad_send_buf {
 };
 
 /**
+ * ib_response_mad - Returns if the specified MAD has been generated in
+ *   response to a sent request or trap.
+ */
+int ib_response_mad(struct ib_mad *mad);
+
+/**
  * ib_get_rmpp_resptime - Returns the RMPP response time.
  * @rmpp_hdr: An RMPP header.
  */