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IB/umad: Add P_Key index support

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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 <[email protected]>
Reviewed-by: Sean Hefty <[email protected]>
Reviewed-by: Hal Rosenstock <[email protected]>
This commit is contained in:
Roland Dreier 2007-10-09 19:59:15 -07:00
commit 2be8e3ee8e
3 changed files with 135 additions and 29 deletions
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14
Documentation/infiniband/user_mad.txt
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@ -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