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/net | |
| 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/net')
| -rw-r--r-- | include/net/mctp.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/net/mctp.h b/include/net/mctp.h index 706d329dd8e8..e80a4baf8379 100644 --- a/include/net/mctp.h +++ b/include/net/mctp.h @@ -126,7 +126,7 @@ struct mctp_sock { */ struct mctp_sk_key { mctp_eid_t peer_addr; - mctp_eid_t local_addr; + mctp_eid_t local_addr; /* MCTP_ADDR_ANY for local owned tags */ __u8 tag; /* incoming tag match; invert TO for local */ /* we hold a ref to sk when set */ @@ -163,6 +163,12 @@ struct mctp_sk_key { */ unsigned long dev_flow_state; struct mctp_dev *dev; + + /* a tag allocated with SIOCMCTPALLOCTAG ioctl will not expire + * automatically on timeout or response, instead SIOCMCTPDROPTAG + * is used. + */ + bool manual_alloc; }; struct mctp_skb_cb { @@ -239,6 +245,9 @@ int mctp_local_output(struct sock *sk, struct mctp_route *rt, struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag); void mctp_key_unref(struct mctp_sk_key *key); +struct mctp_sk_key *mctp_alloc_local_tag(struct mctp_sock *msk, + mctp_eid_t daddr, mctp_eid_t saddr, + bool manual, u8 *tagp); /* routing <--> device interface */ unsigned int mctp_default_net(struct net *net); |