IB/hfi1: Integrate TID RDMA READ protocol into RC protocol

This patch integrates the TID RDMA READ protocol into the IB RC protocol.
This protocol is an end-to-end protocol between the hfi1 drivers on two
OPA nodes that converts a qualified RDMA READ request into a TID RDMA
READ request to avoid data copying on the requester side. The following
codes are added in this patch:
- Send the TID RDMA READ request;
- Complete the TID RDMA READ send request;
- Send the TID RDMA READ response;
- Complete the TID RDMA READ request;

Reviewed-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: Doug Ledford <dledford@redhat.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/tid_rdma.c b/drivers/infiniband/hw/hfi1/tid_rdma.c
index f767c5c20566..f6d9e2717106 100644
--- a/drivers/infiniband/hw/hfi1/tid_rdma.c
+++ b/drivers/infiniband/hw/hfi1/tid_rdma.c
@@ -2796,3 +2796,36 @@ void hfi1_tid_rdma_restart_req(struct rvt_qp *qp, struct rvt_swqe *wqe,
 
 	req->state = TID_REQUEST_ACTIVE;
 }
+
+void hfi1_qp_kern_exp_rcv_clear_all(struct rvt_qp *qp)
+{
+	int i, ret;
+	struct hfi1_qp_priv *qpriv = qp->priv;
+	struct tid_flow_state *fs;
+
+	if (qp->ibqp.qp_type != IB_QPT_RC || !HFI1_CAP_IS_KSET(TID_RDMA))
+		return;
+
+	/*
+	 * First, clear the flow to help prevent any delayed packets from
+	 * being delivered.
+	 */
+	fs = &qpriv->flow_state;
+	if (fs->index != RXE_NUM_TID_FLOWS)
+		hfi1_kern_clear_hw_flow(qpriv->rcd, qp);
+
+	for (i = qp->s_acked; i != qp->s_head;) {
+		struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, i);
+
+		if (++i == qp->s_size)
+			i = 0;
+		/* Free only locally allocated TID entries */
+		if (wqe->wr.opcode != IB_WR_TID_RDMA_READ)
+			continue;
+		do {
+			struct hfi1_swqe_priv *priv = wqe->priv;
+
+			ret = hfi1_kern_exp_rcv_clear(&priv->tid_req);
+		} while (!ret);
+	}
+}