librdmacm: Return ECE results through rdma_accept

Passive side (server) returns its answer through REP message,
which is constructed as a result of rdma_accept().

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

librdmacm/cma.c

@@ -1827,6 +1827,14 @@ int rdma_get_request(struct rdma_cm_id *listen, struct rdma_cm_id **id)
 	return ret;
 }
 
+static void ucma_copy_ece_param_to_kern_rep(struct cma_id_private *id_priv,
+					    struct ucma_abi_ece *dst)
+{
+	/* Return result with same ID as received. */
+	dst->vendor_id = id_priv->remote_ece.vendor_id;
+	dst->attr_mod = id_priv->local_ece.options;
+}
+
 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
 {
 	uint32_t qp_num = id->qp ? id->qp->qp_num : conn_param->qp_num;
@@ -1868,6 +1876,7 @@ int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
 	cmd.uid = (uintptr_t) id_priv;
 	ucma_copy_conn_param_to_kern(id_priv, &cmd.conn_param, conn_param,
 				     qp_num, srq);
+	ucma_copy_ece_param_to_kern_rep(id_priv, &cmd.ece);
 
 	ret = write(id->channel->fd, &cmd, sizeof cmd);
 	if (ret != sizeof cmd) {

librdmacm/rdma_cma_abi.h

@@ -258,6 +258,7 @@ struct ucma_abi_accept {
 	struct ucma_abi_conn_param conn_param;
 	__u32 id;
 	__u32 reserved;
+	struct ucma_abi_ece ece;
 };
 
 struct ucma_abi_reject {