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RDMA/ucma: Support write an event into a CM

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Enable user-space to inject an event into a CM through it's event
channel. Two new events are added and supported: RDMA_CM_EVENT_USER and
RDMA_CM_EVENT_INTERNAL. With these 2 events a new event parameter "arg"
is supported, which is passed from sender to receiver transparently.

With this feature an application is able to write an event into a CM
channel with a new user-space rdmacm API. For example thread T1 could
write an event with the API:
    rdma_write_cm_event(cm_id, RDMA_CM_EVENT_USER, status, arg);
and thread T2 could receive the event with rdma_get_cm_event().

Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Reviewed-by: Vlad Dumitrescu <vdumitrescu@nvidia.com>
Link: https://patch.msgid.link/fdf49d0b17a45933c5d8c1d90605c9447d9a3c73.1751279794.git.leonro@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Mark Zhang
2025-06-30 13:52:35 +03:00
committed by Leon Romanovsky
parent 810f874eda
commit a3c9d0fcd3
3 changed files with 70 additions and 3 deletions
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16
include/uapi/rdma/rdma_user_cm.h
View File

@@ -68,7 +68,8 @@ enum {
RDMA_USER_CM_CMD_BIND,
RDMA_USER_CM_CMD_RESOLVE_ADDR,
RDMA_USER_CM_CMD_JOIN_MCAST,
RDMA_USER_CM_CMD_RESOLVE_IB_SERVICE
RDMA_USER_CM_CMD_RESOLVE_IB_SERVICE,
RDMA_USER_CM_CMD_WRITE_CM_EVENT,
};
/* See IBTA Annex A11, servies ID bytes 4 & 5 */
@@ -304,6 +305,7 @@ struct rdma_ucm_event_resp {
union {
struct rdma_ucm_conn_param conn;
struct rdma_ucm_ud_param ud;
__u32 arg32[2];
} param;
__u32 reserved;
struct rdma_ucm_ece ece;
@@ -362,4 +364,16 @@ struct rdma_ucm_resolve_ib_service {
__u32 id;
struct rdma_ucm_ib_service ibs;
};
struct rdma_ucm_write_cm_event {
__u32 id;
__u32 reserved;
__u32 event;
__u32 status;
union {
struct rdma_ucm_conn_param conn;
struct rdma_ucm_ud_param ud;
__u64 arg;
} param;
};
#endif /* RDMA_USER_CM_H */