Commit:     bd8031b49a9b05933fb1ec1c36620ed4e1e67793
Parent:     37aebbde7023d75bf09fbadb6796276d0a65a068
Author:     Hal Rosenstock <[EMAIL PROTECTED]>
AuthorDate: Tue Apr 24 21:30:38 2007 -0700
Committer:  Roland Dreier <[EMAIL PROTECTED]>
CommitDate: Tue Apr 24 21:30:38 2007 -0700

    IB/umad: Clarify documentation of transaction ID
    Signed-off-by: Hal Rosenstock <[EMAIL PROTECTED]>
    Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
 Documentation/infiniband/user_mad.txt |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/Documentation/infiniband/user_mad.txt 
index 750fe5e..8ec54b9 100644
--- a/Documentation/infiniband/user_mad.txt
+++ b/Documentation/infiniband/user_mad.txt
@@ -91,6 +91,14 @@ Sending MADs
        if (ret != sizeof *mad + mad_length)
+Transaction IDs
+  Users of the umad devices can use the lower 32 bits of the
+  transaction ID field (that is, the least significant half of the
+  field in network byte order) in MADs being sent to match
+  request/response pairs.  The upper 32 bits are reserved for use by
+  the kernel and will be overwritten before a MAD is sent.
 Setting IsSM Capability Bit
   To set the IsSM capability bit for a port, simply open the
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