From 6dddd93938b3651cfeba7158ac179b4e6d3c1553 Mon Sep 17 00:00:00 2001
From: Yonatan Nachum <ynachum@amazon.com>
Date: Sun, 19 Feb 2023 08:13:28 +0000
Subject: RDMA/efa: Add data polling capability feature bit
Add feature bit to existing device caps field. EFA supports data polling
of 128 bytes blocks.
The flag indicates that the NIC guarentees that a 128 byte aligned block
is written in order, ie that observing the last 8 bits of the block mean
the prior 127 bytes are also written.
It is useful for "last data polling" acceleration techniques.
Link: https://lore.kernel.org/r/20230219081328.10419-1-mrgolin@amazon.com
Reviewed-by: Yehuda Yitschak <yehuday@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Yonatan Nachum <ynachum@amazon.com>
Signed-off-by: Michael Margolin <mrgolin@amazon.com>
Acked-by: Gal Pressman <gal.pressman@linux.dev>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/infiniband/hw/efa/efa_admin_cmds_defs.h | 7 +++++--
drivers/infiniband/hw/efa/efa_verbs.c | 5 ++++-
2 files changed, 9 insertions(+), 3 deletions(-)
(limited to 'drivers/infiniband')
diff --git a/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h b/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h
index d4b9226088bd..3db791e6c030 100644
--- a/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h
+++ b/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h
@@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
/*
- * Copyright 2018-2021 Amazon.com, Inc. or its affiliates. All rights reserved.
+ * Copyright 2018-2023 Amazon.com, Inc. or its affiliates. All rights reserved.
*/
#ifndef _EFA_ADMIN_CMDS_H_
@@ -618,7 +618,9 @@ struct efa_admin_feature_device_attr_desc {
* TX queues
* 1 : rnr_retry - If set, RNR retry is supported on
* modify QP command
- * 31:2 : reserved - MBZ
+ * 2 : data_polling_128 - If set, 128 bytes data
+ * polling is supported
+ * 31:3 : reserved - MBZ
*/
u32 device_caps;
@@ -991,6 +993,7 @@ struct efa_admin_host_info {
/* feature_device_attr_desc */
#define EFA_ADMIN_FEATURE_DEVICE_ATTR_DESC_RDMA_READ_MASK BIT(0)
#define EFA_ADMIN_FEATURE_DEVICE_ATTR_DESC_RNR_RETRY_MASK BIT(1)
+#define EFA_ADMIN_FEATURE_DEVICE_ATTR_DESC_DATA_POLLING_128_MASK BIT(2)
/* create_eq_cmd */
#define EFA_ADMIN_CREATE_EQ_CMD_ENTRY_SIZE_WORDS_MASK GENMASK(4, 0)
diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
index 31454643f8c5..c20136e9d3d1 100644
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
- * Copyright 2018-2022 Amazon.com, Inc. or its affiliates. All rights reserved.
+ * Copyright 2018-2023 Amazon.com, Inc. or its affiliates. All rights reserved.
*/
#include <linux/dma-buf.h>
@@ -250,6 +250,9 @@ int efa_query_device(struct ib_device *ibdev,
if (EFA_DEV_CAP(dev, RNR_RETRY))
resp.device_caps |= EFA_QUERY_DEVICE_CAPS_RNR_RETRY;
+ if (EFA_DEV_CAP(dev, DATA_POLLING_128))
+ resp.device_caps |= EFA_QUERY_DEVICE_CAPS_DATA_POLLING_128;
+
if (dev->neqs)
resp.device_caps |= EFA_QUERY_DEVICE_CAPS_CQ_NOTIFICATIONS;
--
cgit