|author||Ira Weiny <firstname.lastname@example.org>||2014-08-08 19:00:55 -0400|
|committer||Roland Dreier <email@example.com>||2014-08-10 20:36:00 -0700|
IB/mad: add new ioctl to ABI to support new registration options
Registrations options are specified through flags. Definitions of flags will be in subsequent patches. Signed-off-by: Ira Weiny <firstname.lastname@example.org> Signed-off-by: Roland Dreier <email@example.com>
Diffstat (limited to 'Documentation/infiniband')
1 files changed, 9 insertions, 4 deletions
diff --git a/Documentation/infiniband/user_mad.txt b/Documentation/infiniband/user_mad.txt
index 8a366959f5cc..7aca13a54a3a 100644
@@ -26,6 +26,11 @@ Creating MAD agents
ioctl. Also, all agents registered through a file descriptor will
be unregistered when the descriptor is closed.
+ 2014 -- a new registration ioctl is now provided which allows additional
+ fields to be provided during registration.
+ Users of this registration call are implicitly setting the use of
+ pkey_index (see below).
MADs are received using read(). The receive side now supports
@@ -104,10 +109,10 @@ 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.
+ with a pkey_index member has been defined; however, to preserve binary
+ compatibility with older applications, this new layout will not be used
+ unless one of IB_USER_MAD_ENABLE_PKEY or IB_USER_MAD_REGISTER_AGENT2 ioctl's
+ are 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