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| author | Hal Rosenstock <halr@voltaire.com> | 2007-04-24 21:30:38 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2007-04-24 21:30:38 -0700 |
| commit | bd8031b49a9b05933fb1ec1c36620ed4e1e67793 (patch) | |
| tree | 1936053b198e7c73a7412e1cbdc6254e18dec4cd /Documentation/infiniband | |
| parent | 37aebbde7023d75bf09fbadb6796276d0a65a068 (diff) | |
| download | lwn-bd8031b49a9b05933fb1ec1c36620ed4e1e67793.tar.gz lwn-bd8031b49a9b05933fb1ec1c36620ed4e1e67793.zip | |
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')
| -rw-r--r-- | Documentation/infiniband/user_mad.txt | 8 |
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 if (ret != sizeof *mad + mad_length) 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 To set the IsSM capability bit for a port, simply open the |