Matt Johnston 63ed1aab3d
mctp: Add SIOCMCTP{ALLOC,DROP}TAG ioctls for tag control ...
This change adds a couple of new ioctls for mctp sockets:
SIOCMCTPALLOCTAG and SIOCMCTPDROPTAG. These ioctls provide facilities
for explicit allocation / release of tags, overriding the automatic
allocate-on-send/release-on-reply and timeout behaviours. This allows
userspace more control over messages that may not fit a simple
request/response model.
In order to indicate a pre-allocated tag to the sendmsg() syscall, we
introduce a new flag to the struct sockaddr_mctp.smctp_tag value:
MCTP_TAG_PREALLOC.
Additional changes from Jeremy Kerr <jk@codeconstruct.com.au >.
Contains a fix that was:
Reported-by: kernel test robot <lkp@intel.com >
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au >
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au >
Signed-off-by: David S. Miller <davem@davemloft.net >
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63ed1aab3d