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From: Haiyang Zhang <haiyangz@microsoft.com>
To: "sashal@kernel.org" <sashal@kernel.org>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"saeedm@mellanox.com" <saeedm@mellanox.com>,
	"leon@kernel.org" <leon@kernel.org>,
	"eranbe@mellanox.com" <eranbe@mellanox.com>,
	"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>,
	KY Srinivasan <kys@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH net-next, 3/6] net/mlx5: Add wrappers for HyperV PCIe operations
Date: Wed, 14 Aug 2019 19:08:57 +0000
Message-ID: <1565809632-39138-4-git-send-email-haiyangz@microsoft.com> (raw)
In-Reply-To: <1565809632-39138-1-git-send-email-haiyangz@microsoft.com>

From: Eran Ben Elisha <eranbe@mellanox.com>

Add wrapper functions for HyperV PCIe read / write /
block_invalidate_register operations.  This will be used as an
infrastructure in the downstream patch for software communication.

This will be enabled by default if CONFIG_PCI_HYPERV_MINI is set.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/Makefile |  1 +
 drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c | 64 ++++++++++++++++++++++++
 drivers/net/ethernet/mellanox/mlx5/core/lib/hv.h | 22 ++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/hv.h

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index 8b7edaa..a8950b1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -45,6 +45,7 @@ mlx5_core-$(CONFIG_MLX5_ESWITCH)   += eswitch.o eswitch_offloads.o eswitch_offlo
 mlx5_core-$(CONFIG_MLX5_MPFS)      += lib/mpfs.o
 mlx5_core-$(CONFIG_VXLAN)          += lib/vxlan.o
 mlx5_core-$(CONFIG_PTP_1588_CLOCK) += lib/clock.o
+mlx5_core-$(CONFIG_PCI_HYPERV_MINI)     += lib/hv.o
 
 #
 # Ipoib netdev
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c
new file mode 100644
index 0000000..cf08d02
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2018 Mellanox Technologies
+
+#include <linux/hyperv.h>
+#include "mlx5_core.h"
+#include "lib/hv.h"
+
+static int mlx5_hv_config_common(struct mlx5_core_dev *dev, void *buf, int len,
+				 int offset, bool read)
+{
+	int rc = -EOPNOTSUPP;
+	int bytes_returned;
+	int block_id;
+
+	if (offset % HV_CONFIG_BLOCK_SIZE_MAX || len % HV_CONFIG_BLOCK_SIZE_MAX)
+		return -EINVAL;
+
+	block_id = offset / HV_CONFIG_BLOCK_SIZE_MAX;
+
+	rc = read ?
+	     hyperv_read_cfg_blk(dev->pdev, buf,
+				 HV_CONFIG_BLOCK_SIZE_MAX, block_id,
+				 &bytes_returned) :
+	     hyperv_write_cfg_blk(dev->pdev, buf,
+				  HV_CONFIG_BLOCK_SIZE_MAX, block_id);
+
+	/* Make sure len bytes were read successfully  */
+	if (read)
+		rc |= !(len == bytes_returned);
+
+	if (rc) {
+		mlx5_core_err(dev, "Failed to %s hv config, err = %d, len = %d, offset = %d\n",
+			      read ? "read" : "write", rc, len,
+			      offset);
+		return rc;
+	}
+
+	return 0;
+}
+
+int mlx5_hv_read_config(struct mlx5_core_dev *dev, void *buf, int len,
+			int offset)
+{
+	return mlx5_hv_config_common(dev, buf, len, offset, true);
+}
+
+int mlx5_hv_write_config(struct mlx5_core_dev *dev, void *buf, int len,
+			 int offset)
+{
+	return mlx5_hv_config_common(dev, buf, len, offset, false);
+}
+
+int mlx5_hv_register_invalidate(struct mlx5_core_dev *dev, void *context,
+				void (*block_invalidate)(void *context,
+							 u64 block_mask))
+{
+	return hyperv_reg_block_invalidate(dev->pdev, context,
+					   block_invalidate);
+}
+
+void mlx5_hv_unregister_invalidate(struct mlx5_core_dev *dev)
+{
+	hyperv_reg_block_invalidate(dev->pdev, NULL, NULL);
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.h
new file mode 100644
index 0000000..7f69771
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2019 Mellanox Technologies. */
+
+#ifndef __LIB_HV_H__
+#define __LIB_HV_H__
+
+#if IS_ENABLED(CONFIG_PCI_HYPERV_MINI)
+
+#include <linux/hyperv.h>
+#include <linux/mlx5/driver.h>
+
+int mlx5_hv_read_config(struct mlx5_core_dev *dev, void *buf, int len,
+			int offset);
+int mlx5_hv_write_config(struct mlx5_core_dev *dev, void *buf, int len,
+			 int offset);
+int mlx5_hv_register_invalidate(struct mlx5_core_dev *dev, void *context,
+				void (*block_invalidate)(void *context,
+							 u64 block_mask));
+void mlx5_hv_unregister_invalidate(struct mlx5_core_dev *dev);
+#endif
+
+#endif /* __LIB_HV_H__ */
-- 
1.8.3.1


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-14 19:08 [PATCH net-next, 0/6] Add software backchannel and mlx5e HV VHCA stats Haiyang Zhang
2019-08-14 19:08 ` [PATCH net-next, 1/6] PCI: hv: Add a paravirtual backchannel in software Haiyang Zhang
2019-08-14 19:08 ` [PATCH net-next, 2/6] PCI: hv: Add a Hyper-V PCI mini driver for software backchannel interface Haiyang Zhang
2019-08-16 12:27   ` Vitaly Kuznetsov
2019-08-16 14:48     ` Haiyang Zhang
2019-08-16 16:16       ` Vitaly Kuznetsov
2019-08-16 19:50         ` Haiyang Zhang
2019-08-14 19:08 ` Haiyang Zhang [this message]
2019-08-14 20:41   ` [PATCH net-next, 3/6] net/mlx5: Add wrappers for HyperV PCIe operations Mark Bloch
2019-08-15 11:34     ` Eran Ben Elisha
2019-08-19 15:04       ` Haiyang Zhang
2019-08-14 19:08 ` [PATCH net-next, 4/6] net/mlx5: Add HV VHCA infrastructure Haiyang Zhang
2019-08-14 20:41   ` Mark Bloch
2019-08-15 11:35     ` Eran Ben Elisha
2019-08-14 19:09 ` [PATCH net-next, 5/6] net/mlx5: Add HV VHCA control agent Haiyang Zhang
2019-08-14 20:41   ` Mark Bloch
2019-08-15 11:35     ` Eran Ben Elisha
2019-08-14 19:09 ` [PATCH net-next, 6/6] net/mlx5e: Add mlx5e HV VHCA stats agent Haiyang Zhang

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