netdev - [PATCH rdma-next v1 3/3] IB/mlx5: Add page fault handler for DC initiator WQE

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Date:   Sun,  4 Aug 2019 13:00:48 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Cc:     Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Michael Guralnik <michaelgur@...lanox.com>,
        Moni Shoua <monis@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: [PATCH rdma-next v1 3/3] IB/mlx5: Add page fault handler for DC initiator WQE

From: Michael Guralnik <michaelgur@...lanox.com>

Parsing DC initiator WQEs upon page fault requires skipping an address
vector segment, as in UD WQEs.

Signed-off-by: Michael Guralnik <michaelgur@...lanox.com>
Reviewed-by: Moni Shoua <monis@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
---
 drivers/infiniband/hw/mlx5/odp.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 5e87a5e25574..6f1de5edbe8e 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -1065,6 +1065,12 @@ static int mlx5_ib_mr_initiator_pfault_handler(
 	case IB_QPT_UD:
 		transport_caps = dev->odp_caps.per_transport_caps.ud_odp_caps;
 		break;
+	case IB_QPT_DRIVER:
+		if (qp->qp_sub_type == MLX5_IB_QPT_DCI) {
+			transport_caps = dev->dc_odp_caps;
+			break;
+		}
+		/* fall through */
 	default:
 		mlx5_ib_err(dev, "ODP fault on QP of an unsupported transport 0x%x\n",
 			    qp->ibqp.qp_type);
@@ -1078,7 +1084,8 @@ static int mlx5_ib_mr_initiator_pfault_handler(
 		return -EFAULT;
 	}
 
-	if (qp->ibqp.qp_type == IB_QPT_UD) {
+	if (qp->ibqp.qp_type == IB_QPT_UD ||
+	    qp->qp_sub_type == MLX5_IB_QPT_DCI) {
 		av = *wqe;
 		if (av->dqp_dct & cpu_to_be32(MLX5_EXTENDED_UD_AV))
 			*wqe += sizeof(struct mlx5_av);
-- 
2.20.1