path: root/Documentation/infiniband
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authorHal Rosenstock <halr@voltaire.com>2007-04-24 21:30:38 -0700
committerRoland Dreier <rolandd@cisco.com>2007-04-24 21:30:38 -0700
commitbd8031b49a9b05933fb1ec1c36620ed4e1e67793 (patch)
tree1936053b198e7c73a7412e1cbdc6254e18dec4cd /Documentation/infiniband
parent37aebbde7023d75bf09fbadb6796276d0a65a068 (diff)
IB/umad: Clarify documentation of transaction ID
Signed-off-by: Hal Rosenstock <halr@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'Documentation/infiniband')
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/infiniband/user_mad.txt b/Documentation/infiniband/user_mad.txt
index 750fe5e80eb..8ec54b974b6 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