From: Noa Osherovich <noaos@mellanox.com>
Date: Sun, 29 Oct 2017 13:59:45 +0200
Subject: IB/mlx5: Add PCI write end padding support
Patch-mainline: v4.15-rc1
Git-commit: b1383aa64121778d9419cc982e387e27d9e96c64
References: bsc#1103991 FATE#326007
Add the PCI write end padding flag to device_cap_flags enum and set it
during mlx5_ib_query_device so it will be reported to user-space.
During WQ/QP creation, set that capability for WQ/QP if user requested
it and HW supports it.
PCI write end padding modification is not supported for now. There's no
such flag for a QP but for a WQ, create and modify use the same flag.
Return an error if PCI write end padding flag is set during modify_wq.
Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/hw/mlx5/main.c | 3 ++
drivers/infiniband/hw/mlx5/mlx5_ib.h | 3 +-
drivers/infiniband/hw/mlx5/qp.c | 36 ++++++++++++++++++++++++++++++++---
3 files changed, 38 insertions(+), 4 deletions(-)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -715,6 +715,9 @@ static int mlx5_ib_query_device(struct i
if (mlx5_get_flow_namespace(dev->mdev, MLX5_FLOW_NAMESPACE_BYPASS))
props->device_cap_flags |= IB_DEVICE_MANAGED_FLOW_STEERING;
+ if (MLX5_CAP_GEN(mdev, end_pad))
+ props->device_cap_flags |= IB_DEVICE_PCI_WRITE_END_PADDING;
+
props->vendor_part_id = mdev->pdev->device;
props->hw_ver = mdev->pdev->revision;
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -228,6 +228,7 @@ struct wr_list {
enum mlx5_ib_rq_flags {
MLX5_IB_RQ_CVLAN_STRIPPING = 1 << 0,
+ MLX5_IB_RQ_PCI_WRITE_END_PADDING = 1 << 1,
};
struct mlx5_ib_wq {
@@ -421,7 +422,7 @@ enum mlx5_ib_qp_flags {
MLX5_IB_QP_RSS = 1 << 8,
MLX5_IB_QP_CVLAN_STRIPPING = 1 << 9,
MLX5_IB_QP_UNDERLAY = 1 << 10,
- /* Reserved for PCI_WRITE_PAD = 1 << 11, */
+ MLX5_IB_QP_PCI_WRITE_END_PADDING = 1 << 11,
MLX5_IB_QP_TUNNEL_OFFLOAD = 1 << 12,
};
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -1178,8 +1178,8 @@ static int create_raw_packet_qp_rq(struc
wq = MLX5_ADDR_OF(rqc, rqc, wq);
MLX5_SET(wq, wq, wq_type, MLX5_WQ_TYPE_CYCLIC);
- MLX5_SET(wq, wq, end_padding_mode,
- MLX5_GET(qpc, qpc, end_padding_mode));
+ if (rq->flags & MLX5_IB_RQ_PCI_WRITE_END_PADDING)
+ MLX5_SET(wq, wq, end_padding_mode, MLX5_WQ_END_PAD_MODE_ALIGN);
MLX5_SET(wq, wq, page_offset, MLX5_GET(qpc, qpc, page_offset));
MLX5_SET(wq, wq, pd, MLX5_GET(qpc, qpc, pd));
MLX5_SET64(wq, wq, dbr_addr, MLX5_GET64(qpc, qpc, dbr_addr));
@@ -1276,6 +1276,8 @@ static int create_raw_packet_qp(struct m
if (qp->flags & MLX5_IB_QP_CVLAN_STRIPPING)
rq->flags |= MLX5_IB_RQ_CVLAN_STRIPPING;
+ if (qp->flags & MLX5_IB_QP_PCI_WRITE_END_PADDING)
+ rq->flags |= MLX5_IB_RQ_PCI_WRITE_END_PADDING;
err = create_raw_packet_qp_rq(dev, rq, in);
if (err)
goto err_destroy_sq;
@@ -1821,6 +1823,19 @@ static int create_qp_common(struct mlx5_
qp->flags |= MLX5_IB_QP_LSO;
}
+ if (init_attr->create_flags & IB_QP_CREATE_PCI_WRITE_END_PADDING) {
+ if (!MLX5_CAP_GEN(dev->mdev, end_pad)) {
+ mlx5_ib_dbg(dev, "scatter end padding is not supported\n");
+ err = -EOPNOTSUPP;
+ goto err;
+ } else if (init_attr->qp_type != IB_QPT_RAW_PACKET) {
+ MLX5_SET(qpc, qpc, end_padding_mode,
+ MLX5_WQ_END_PAD_MODE_ALIGN);
+ } else {
+ qp->flags |= MLX5_IB_QP_PCI_WRITE_END_PADDING;
+ }
+ }
+
if (init_attr->qp_type == IB_QPT_RAW_PACKET ||
qp->flags & MLX5_IB_QP_UNDERLAY) {
qp->raw_packet_qp.sq.ubuffer.buf_addr = ucmd.sq_buf_addr;
@@ -1865,6 +1880,7 @@ err_create:
else if (qp->create_type == MLX5_QP_KERNEL)
destroy_qp_kernel(dev, qp);
+err:
kvfree(in);
return err;
}
@@ -4749,7 +4765,15 @@ static int create_rq(struct mlx5_ib_rwq
MLX5_SET(wq, wq, wq_type,
rwq->create_flags & MLX5_IB_WQ_FLAGS_STRIDING_RQ ?
MLX5_WQ_TYPE_CYCLIC_STRIDING_RQ : MLX5_WQ_TYPE_CYCLIC);
- MLX5_SET(wq, wq, end_padding_mode, MLX5_WQ_END_PAD_MODE_ALIGN);
+ if (init_attr->create_flags & IB_WQ_FLAGS_PCI_WRITE_END_PADDING) {
+ if (!MLX5_CAP_GEN(dev->mdev, end_pad)) {
+ mlx5_ib_dbg(dev, "Scatter end padding is not supported\n");
+ err = -EOPNOTSUPP;
+ goto out;
+ } else {
+ MLX5_SET(wq, wq, end_padding_mode, MLX5_WQ_END_PAD_MODE_ALIGN);
+ }
+ }
MLX5_SET(wq, wq, log_wq_stride, rwq->log_rq_stride);
if (rwq->create_flags & MLX5_IB_WQ_FLAGS_STRIDING_RQ) {
MLX5_SET(wq, wq, two_byte_shift_en, rwq->two_byte_shift_en);
@@ -5129,6 +5153,12 @@ int mlx5_ib_modify_wq(struct ib_wq *wq,
MLX5_SET(rqc, rqc, vsd,
(wq_attr->flags & IB_WQ_FLAGS_CVLAN_STRIPPING) ? 0 : 1);
}
+
+ if (wq_attr->flags_mask & IB_WQ_FLAGS_PCI_WRITE_END_PADDING) {
+ mlx5_ib_dbg(dev, "Modifying scatter end padding is not supported\n");
+ err = -EOPNOTSUPP;
+ goto out;
+ }
}
if (curr_wq_state == IB_WQS_RESET && wq_state == IB_WQS_RDY) {