diff options
| author | Matt Johnston <matt@codeconstruct.com.au> | 2022-02-09 07:05:57 +0300 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2022-03-18 03:38:38 +0300 |
| commit | 75ce2111151a757729dd33d498b1d1cf58af8636 (patch) | |
| tree | 3437ce2d7b48ef67916f02ef642e51a6b8367f52 /include/uapi | |
| parent | a0ca9e58d596699d11f9b6f237131fc5153a07fc (diff) | |
| download | linux-75ce2111151a757729dd33d498b1d1cf58af8636.tar.xz | |
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>
OpenBMC-Staging-Count: 1
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>
(cherry picked from commit 63ed1aab3d40aa61aaa66819bdce9377ac7f40fa)
Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'include/uapi')
| -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 */ |