IB/hfi1: Allow the driver to initialize QP priv struct

This patch adds an interface to allow the driver to initialize the QP priv
struct when the QP is created and after the qpn has been assigned.  A
field is added to the QP priv struct to reference the rcd and two new
files are added to contain the function to initialize the rcd field so
that more TID RDMA related code can be added here later.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/tid_rdma.c b/drivers/infiniband/hw/hfi1/tid_rdma.c
new file mode 100644
index 000000000000..da1ecb68a928
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/tid_rdma.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+/*
+ * Copyright(c) 2018 Intel Corporation.
+ *
+ */
+
+#include "hfi.h"
+#include "verbs.h"
+#include "tid_rdma.h"
+
+/**
+ * qp_to_rcd - determine the receive context used by a qp
+ * @qp - the qp
+ *
+ * This routine returns the receive context associated
+ * with a a qp's qpn.
+ *
+ * Returns the context.
+ */
+static struct hfi1_ctxtdata *qp_to_rcd(struct rvt_dev_info *rdi,
+				       struct rvt_qp *qp)
+{
+	struct hfi1_ibdev *verbs_dev = container_of(rdi,
+						    struct hfi1_ibdev,
+						    rdi);
+	struct hfi1_devdata *dd = container_of(verbs_dev,
+					       struct hfi1_devdata,
+					       verbs_dev);
+	unsigned int ctxt;
+
+	if (qp->ibqp.qp_num == 0)
+		ctxt = 0;
+	else
+		ctxt = ((qp->ibqp.qp_num >> dd->qos_shift) %
+			(dd->n_krcv_queues - 1)) + 1;
+
+	return dd->rcd[ctxt];
+}
+
+int hfi1_qp_priv_init(struct rvt_dev_info *rdi, struct rvt_qp *qp,
+		      struct ib_qp_init_attr *init_attr)
+{
+	struct hfi1_qp_priv *qpriv = qp->priv;
+
+	qpriv->rcd = qp_to_rcd(rdi, qp);
+
+	return 0;
+}