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IB/umad: Clarify documentation of transaction ID

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Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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Hal Rosenstock 2007-04-24 21:30:38 -07:00 committed by Roland Dreier
parent 37aebbde70
commit bd8031b49a
1 changed files with 8 additions and 0 deletions
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8
Documentation/infiniband/user_mad.txt
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@ -91,6 +91,14 @@ Sending MADs
if (ret != sizeof *mad + mad_length) if (ret != sizeof *mad + mad_length)
perror("write"); perror("write");
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 Setting IsSM Capability Bit
To set the IsSM capability bit for a port, simply open the To set the IsSM capability bit for a port, simply open the