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| author | Parav Pandit <parav@mellanox.com> | 2018-01-18 10:11:16 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-01-19 13:05:38 -0700 |
| commit | 411460ac50b0832eeb631d167a355dfe9a228c89 (patch) | |
| tree | 2668cf4439e26ddac8e6eef59ce60245ef959485 /include/rdma/rdma_cm.h | |
| parent | 2ffcf04263832557dc55d5a7339d8f29428b679a (diff) | |
| download | lwn-411460ac50b0832eeb631d167a355dfe9a228c89.tar.gz lwn-411460ac50b0832eeb631d167a355dfe9a228c89.zip | |
RDMA/cma: Introduce API to read GIDs for multiple transports
This patch introduces an API that allows legacy applications to query
GIDs for a rdma_cm_id which is used during connection establishment.
GIDs are stored and created differently for iWarp, IB and RoCE transports.
Therefore rdma_read_gids() returns GID for all the transports hiding
such internal details to caller.
It is usable for client side and server side connections.
In general continued use of GID based addressing outside of IB is
discouraged, so rdma_read_gids() should not be used by any new ULPs.
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma/rdma_cm.h')
| -rw-r--r-- | include/rdma/rdma_cm.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h index 3d2eed3c4e75..6538a5cc27b6 100644 --- a/include/rdma/rdma_cm.h +++ b/include/rdma/rdma_cm.h @@ -413,4 +413,23 @@ bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason); const void *rdma_consumer_reject_data(struct rdma_cm_id *id, struct rdma_cm_event *ev, u8 *data_len); +/** + * rdma_read_gids - Return the SGID and DGID used for establishing + * connection. This can be used after rdma_resolve_addr() + * on client side. This can be use on new connection + * on server side. This is applicable to IB, RoCE, iWarp. + * If cm_id is not bound yet to the RDMA device, it doesn't + * copy and SGID or DGID to the given pointers. + * @id: Communication identifier whose GIDs are queried. + * @sgid: Pointer to SGID where SGID will be returned. It is optional. + * @dgid: Pointer to DGID where DGID will be returned. It is optional. + * Note: This API should not be used by any new ULPs or new code. + * Instead, users interested in querying GIDs should refer to path record + * of the rdma_cm_id to query the GIDs. + * This API is provided for compatibility for existing users. + */ + +void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid, + union ib_gid *dgid); + #endif /* RDMA_CM_H */ |