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authorHal Rosenstock <halr@voltaire.com>2007-04-25 00:30:38 -0400
committerRoland Dreier <rolandd@cisco.com>2007-04-25 00:30:38 -0400
commitbd8031b49a9b05933fb1ec1c36620ed4e1e67793 (patch)
tree1936053b198e7c73a7412e1cbdc6254e18dec4cd
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>
-rw-r--r--Documentation/infiniband/user_mad.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/infiniband/user_mad.txt b/Documentation/infiniband/user_mad.txt
index 750fe5e80ebc..8ec54b974b67 100644
--- a/Documentation/infiniband/user_mad.txt
+++ b/Documentation/infiniband/user_mad.txt
@@ -91,6 +91,14 @@ Sending MADs
91 if (ret != sizeof *mad + mad_length) 91 if (ret != sizeof *mad + mad_length)
92 perror("write"); 92 perror("write");
93 93
94Transaction IDs
95
96 Users of the umad devices can use the lower 32 bits of the
97 transaction ID field (that is, the least significant half of the
98 field in network byte order) in MADs being sent to match
99 request/response pairs. The upper 32 bits are reserved for use by
100 the kernel and will be overwritten before a MAD is sent.
101
94Setting IsSM Capability Bit 102Setting IsSM Capability Bit
95 103
96 To set the IsSM capability bit for a port, simply open the 104 To set the IsSM capability bit for a port, simply open the