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| author | Roland Dreier <rolandd@cisco.com> | 2007-10-09 19:59:15 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2007-10-09 19:59:15 -0700 |
| commit | 2be8e3ee8efd6f99ce454115c29d09750915021a (patch) | |
| tree | 00e21e061a18c7bd1339ebbb637de9701863312d /Documentation/infiniband | |
| parent | c01759cee91379cc3cb551bfd7c76f1b51f91ca2 (diff) | |
| download | lwn-2be8e3ee8efd6f99ce454115c29d09750915021a.tar.gz lwn-2be8e3ee8efd6f99ce454115c29d09750915021a.zip | |
IB/umad: Add P_Key index support
Add support for setting the P_Key index of sent MADs and getting the
P_Key index of received MADs. This requires a change to the layout of
the ABI structure struct ib_user_mad_hdr, so to avoid breaking
compatibility, we default to the old (unchanged) ABI and add a new
ioctl IB_USER_MAD_ENABLE_PKEY that allows applications that are aware
of the new ABI to opt into using it.
We plan on switching to the new ABI by default in a year or so, and
this patch adds a warning that is printed when an application uses the
old ABI, to push people towards converting to the new ABI.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Reviewed-by: Hal Rosenstock <hal@xsigo.com>
Diffstat (limited to 'Documentation/infiniband')
| -rw-r--r-- | Documentation/infiniband/user_mad.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/infiniband/user_mad.txt b/Documentation/infiniband/user_mad.txt index 8ec54b974b67..744687dd195b 100644 --- a/Documentation/infiniband/user_mad.txt +++ b/Documentation/infiniband/user_mad.txt @@ -99,6 +99,20 @@ Transaction IDs request/response pairs. The upper 32 bits are reserved for use by the kernel and will be overwritten before a MAD is sent. +P_Key Index Handling + + The old ib_umad interface did not allow setting the P_Key index for + MADs that are sent and did not provide a way for obtaining the P_Key + index of received MADs. A new layout for struct ib_user_mad_hdr + with a pkey_index member has been defined; however, to preserve + binary compatibility with older applications, this new layout will + not be used unless the IB_USER_MAD_ENABLE_PKEY ioctl is called + before a file descriptor is used for anything else. + + In September 2008, the IB_USER_MAD_ABI_VERSION will be incremented + to 6, the new layout of struct ib_user_mad_hdr will be used by + default, and the IB_USER_MAD_ENABLE_PKEY ioctl will be removed. + Setting IsSM Capability Bit To set the IsSM capability bit for a port, simply open the |