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RDMA/cma: Add multicast communication support

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Extend rdma_cm to support multicast communication.  Multicast support
is added to the existing RDMA_PS_UDP port space, as well as a new
RDMA_PS_IPOIB port space.  The latter port space allows joining the
multicast groups used by IPoIB, which enables offloading IPoIB traffic
to a separate QP.  The port space determines the signature used in the
MGID when joining the group.  The newly added RDMA_PS_IPOIB also
allows for unicast operations, similar to RDMA_PS_UDP.

Supporting the RDMA_PS_IPOIB requires changing how UD QPs are initialized,
since we can no longer assume that the qkey is constant.  This requires
saving the Q_Key to use when attaching to a device, so that it is
available when creating the QP.  The Q_Key information is exported to
the user through the existing rdma_init_qp_attr() interface.

Multicast support is also exported to userspace through the rdma_ucm.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Sean Hefty
2007-02-15 17:00:18 -08:00
committed by Roland Dreier
parent faec2f7b96
commit c8f6a362bf
5 changed files with 549 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
include/rdma/rdma_cm.h
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@@ -52,10 +52,13 @@ enum rdma_cm_event_type {
RDMA_CM_EVENT_ESTABLISHED,
RDMA_CM_EVENT_DISCONNECTED,
RDMA_CM_EVENT_DEVICE_REMOVAL,
RDMA_CM_EVENT_MULTICAST_JOIN,
RDMA_CM_EVENT_MULTICAST_ERROR
};
enum rdma_port_space {
RDMA_PS_SDP = 0x0001,
RDMA_PS_IPOIB= 0x0002,
RDMA_PS_TCP = 0x0106,
RDMA_PS_UDP = 0x0111,
RDMA_PS_SCTP = 0x0183
@@ -294,5 +297,21 @@ int rdma_reject(struct rdma_cm_id *id, const void *private_data,
*/
int rdma_disconnect(struct rdma_cm_id *id);
#endif /* RDMA_CM_H */
/**
* rdma_join_multicast - Join the multicast group specified by the given
* address.
* @id: Communication identifier associated with the request.
* @addr: Multicast address identifying the group to join.
* @context: User-defined context associated with the join request, returned
* to the user through the private_data pointer in multicast events.
*/
int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
void *context);
/**
* rdma_leave_multicast - Leave the multicast group specified by the given
* address.
*/
void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
#endif /* RDMA_CM_H */

4
include/rdma/rdma_cm_ib.h
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@@ -44,7 +44,7 @@
int rdma_set_ib_paths(struct rdma_cm_id *id,
struct ib_sa_path_rec *path_rec, int num_paths);
/* Global qkey for UD QPs and multicast groups. */
#define RDMA_UD_QKEY 0x01234567
/* Global qkey for UDP QPs and multicast groups. */
#define RDMA_UDP_QKEY 0x01234567
#endif /* RDMA_CM_IB_H */

13
include/rdma/rdma_user_cm.h
View File

@@ -38,7 +38,7 @@
#include <rdma/ib_user_verbs.h>
#include <rdma/ib_user_sa.h>
#define RDMA_USER_CM_ABI_VERSION 3
#define RDMA_USER_CM_ABI_VERSION 4
#define RDMA_MAX_PRIVATE_DATA 256
@@ -58,7 +58,9 @@ enum {
RDMA_USER_CM_CMD_GET_EVENT,
RDMA_USER_CM_CMD_GET_OPTION,
RDMA_USER_CM_CMD_SET_OPTION,
RDMA_USER_CM_CMD_NOTIFY
RDMA_USER_CM_CMD_NOTIFY,
RDMA_USER_CM_CMD_JOIN_MCAST,
RDMA_USER_CM_CMD_LEAVE_MCAST
};
/*
@@ -188,6 +190,13 @@ struct rdma_ucm_notify {
__u32 event;
};
struct rdma_ucm_join_mcast {
__u64 response; /* rdma_ucm_create_id_resp */
__u64 uid;
struct sockaddr_in6 addr;
__u32 id;
};
struct rdma_ucm_get_event {
__u64 response;
};