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| author | Matt Johnston <matt@codeconstruct.com.au> | 2022-02-09 12:05:57 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-02-09 12:00:11 +0000 |
| commit | 63ed1aab3d40aa61aaa66819bdce9377ac7f40fa (patch) | |
| tree | 6f239012c2653e6f0d89ef1ac483467e2590a339 /include/uapi/linux/mctp.h | |
| parent | 0de55a7d1133d0ab1acad5d91eea6ccd8cf6d448 (diff) | |
| download | linux-63ed1aab3d40aa61aaa66819bdce9377ac7f40fa.tar.gz linux-63ed1aab3d40aa61aaa66819bdce9377ac7f40fa.tar.bz2 linux-63ed1aab3d40aa61aaa66819bdce9377ac7f40fa.zip | |
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>
Diffstat (limited to 'include/uapi/linux/mctp.h')
| -rw-r--r-- | include/uapi/linux/mctp.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/uapi/linux/mctp.h b/include/uapi/linux/mctp.h index 07b0318716fc..154ab56651f1 100644 --- a/include/uapi/linux/mctp.h +++ b/include/uapi/linux/mctp.h @@ -44,7 +44,25 @@ struct sockaddr_mctp_ext { #define MCTP_TAG_MASK 0x07 #define MCTP_TAG_OWNER 0x08 +#define MCTP_TAG_PREALLOC 0x10 #define MCTP_OPT_ADDR_EXT 1 +#define SIOCMCTPALLOCTAG (SIOCPROTOPRIVATE + 0) +#define SIOCMCTPDROPTAG (SIOCPROTOPRIVATE + 1) + +struct mctp_ioc_tag_ctl { + mctp_eid_t peer_addr; + + /* For SIOCMCTPALLOCTAG: must be passed as zero, kernel will + * populate with the allocated tag value. Returned tag value will + * always have TO and PREALLOC set. + * + * For SIOCMCTPDROPTAG: userspace provides tag value to drop, from + * a prior SIOCMCTPALLOCTAG call (and so must have TO and PREALLOC set). + */ + __u8 tag; + __u16 flags; +}; + #endif /* __UAPI_MCTP_H */ |