From: Parav Pandit <parav@xxxxxxxxxxxx>
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.
rdma_read_gids() should not be used by any new ULPs.
Signed-off-by: Parav Pandit <parav@xxxxxxxxxxxx>
Reviewed-by: Daniel Jurgens <danielj@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
---
drivers/infiniband/core/cma.c | 27 +++++++++++++++++++++++++++
include/rdma/rdma_cm.h | 19 +++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 3810716ea65e..a4c010e7b82b 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2037,6 +2037,33 @@ __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
}
EXPORT_SYMBOL(rdma_get_service_id);
+void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
+ union ib_gid *dgid)
+{
+ struct rdma_addr *addr = &cm_id->route.addr;
+
+ if (!cm_id->device) {
+ if (sgid)
+ memset(sgid, 0, sizeof(*sgid));
+ if (dgid)
+ memset(dgid, 0, sizeof(*dgid));
+ return;
+ }
+
+ if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
+ if (sgid)
+ rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
+ if (dgid)
+ rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
+ } else {
+ if (sgid)
+ rdma_addr_get_sgid(&addr->dev_addr, sgid);
+ if (dgid)
+ rdma_addr_get_dgid(&addr->dev_addr, dgid);
+ }
+}
+EXPORT_SYMBOL(rdma_read_gids);
+
static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
{
struct rdma_id_private *id_priv = iw_id->context;
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 */
--
2.15.1
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