Re: [PATCH V1 vfio 6/9] virtio-pci: Introduce APIs to execute legacy IO admin commands

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Re sending as previous reply was by mistake not in a text format.

On 25/10/2023 0:01, Michael S. Tsirkin wrote:
On Tue, Oct 17, 2023 at 04:42:14PM +0300, Yishai Hadas wrote:
Introduce APIs to execute legacy IO admin commands.

It includes: list_query/use, io_legacy_read/write,
io_legacy_notify_info.

Those APIs will be used by the next patches from this series.

Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxx>
---
  drivers/virtio/virtio_pci_common.c |  11 ++
  drivers/virtio/virtio_pci_common.h |   2 +
  drivers/virtio/virtio_pci_modern.c | 206 +++++++++++++++++++++++++++++
  include/linux/virtio_pci_admin.h   |  18 +++
  4 files changed, 237 insertions(+)
  create mode 100644 include/linux/virtio_pci_admin.h

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 6b4766d5abe6..212d68401d2c 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -645,6 +645,17 @@ static struct pci_driver virtio_pci_driver = {
  	.sriov_configure = virtio_pci_sriov_configure,
  };
+struct virtio_device *virtio_pci_vf_get_pf_dev(struct pci_dev *pdev)
+{
+	struct virtio_pci_device *pf_vp_dev;
+
+	pf_vp_dev = pci_iov_get_pf_drvdata(pdev, &virtio_pci_driver);
+	if (IS_ERR(pf_vp_dev))
+		return NULL;
+
+	return &pf_vp_dev->vdev;
+}
+
  module_pci_driver(virtio_pci_driver);
MODULE_AUTHOR("Anthony Liguori <aliguori@xxxxxxxxxx>");
diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
index a21b9ba01a60..2785e61ed668 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -155,4 +155,6 @@ static inline void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
  int virtio_pci_modern_probe(struct virtio_pci_device *);
  void virtio_pci_modern_remove(struct virtio_pci_device *);
+struct virtio_device *virtio_pci_vf_get_pf_dev(struct pci_dev *pdev);
+
  #endif
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index cc159a8e6c70..00b65e20b2f5 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -719,6 +719,212 @@ static void vp_modern_destroy_avq(struct virtio_device *vdev)
  	vp_dev->del_vq(&vp_dev->admin_vq.info);
  }
+/*
+ * virtio_pci_admin_list_query - Provides to driver list of commands
+ * supported for the PCI VF.
+ * @dev: VF pci_dev
+ * @buf: buffer to hold the returned list
+ * @buf_size: size of the given buffer
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_list_query(struct pci_dev *pdev, u8 *buf, int buf_size)
+{
+	struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+	struct virtio_admin_cmd cmd = {};
+	struct scatterlist result_sg;
+
+	if (!virtio_dev)
+		return -ENODEV;
+
+	sg_init_one(&result_sg, buf, buf_size);
+	cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_QUERY);
+	cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+	cmd.result_sg = &result_sg;
+
+	return vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_list_query);
+
+/*
+ * virtio_pci_admin_list_use - Provides to device list of commands
+ * used for the PCI VF.
+ * @dev: VF pci_dev
+ * @buf: buffer which holds the list
+ * @buf_size: size of the given buffer
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_list_use(struct pci_dev *pdev, u8 *buf, int buf_size)
+{
+	struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+	struct virtio_admin_cmd cmd = {};
+	struct scatterlist data_sg;
+
+	if (!virtio_dev)
+		return -ENODEV;
+
+	sg_init_one(&data_sg, buf, buf_size);
+	cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_USE);
+	cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+	cmd.data_sg = &data_sg;
+
+	return vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_list_use);
list commands are actually for a group, not for the VF.
The VF was given to let the function gets the PF from it.
For now, the only existing 'group_type' in the spec is SRIOV, this is why we hard-coded it internally to match the VF PCI.

Alternatively,
We can change the API to get the PF and 'group_type' from the caller to better match future usage. However, this will require to export the virtio_pci_vf_get_pf_dev() API outside virtio-pci.

Do you prefer to change to the latter option ?
+
+/*
+ * virtio_pci_admin_legacy_io_write - Write legacy registers of a member device
+ * @dev: VF pci_dev
+ * @opcode: op code of the io write command
opcode is actually either VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_WRITE
or VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_WRITE correct?

So please just add 2 APIs for this so users don't need to care.
Could be wrappers around these two things.


OK.
We'll export the below 2 APIs [1] which internally will call virtio_pci_admin_legacy_io_write() with the proper op code hard-coded.
[1]virtio_pci_admin_legacy_device_io_write()
     virtio_pci_admin_legacy_common_io_write()

Yishai


+ * @offset: starting byte offset within the registers to write to
+ * @size: size of the data to write
+ * @buf: buffer which holds the data
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_io_write(struct pci_dev *pdev, u16 opcode,
+				     u8 offset, u8 size, u8 *buf)
+{
+	struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+	struct virtio_admin_cmd_legacy_wr_data *data;
+	struct virtio_admin_cmd cmd = {};
+	struct scatterlist data_sg;
+	int vf_id;
+	int ret;
+
+	if (!virtio_dev)
+		return -ENODEV;
+
+	vf_id = pci_iov_vf_id(pdev);
+	if (vf_id < 0)
+		return vf_id;
+
+	data = kzalloc(sizeof(*data) + size, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->offset = offset;
+	memcpy(data->registers, buf, size);
+	sg_init_one(&data_sg, data, sizeof(*data) + size);
+	cmd.opcode = cpu_to_le16(opcode);
+	cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+	cmd.group_member_id = cpu_to_le64(vf_id + 1);
+	cmd.data_sg = &data_sg;
+	ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+
+	kfree(data);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_io_write);
+
+/*
+ * virtio_pci_admin_legacy_io_read - Read legacy registers of a member device
+ * @dev: VF pci_dev
+ * @opcode: op code of the io read command
+ * @offset: starting byte offset within the registers to read from
+ * @size: size of the data to be read
+ * @buf: buffer to hold the returned data
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_io_read(struct pci_dev *pdev, u16 opcode,
+				    u8 offset, u8 size, u8 *buf)
+{
+	struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+	struct virtio_admin_cmd_legacy_rd_data *data;
+	struct scatterlist data_sg, result_sg;
+	struct virtio_admin_cmd cmd = {};
+	int vf_id;
+	int ret;
+
+	if (!virtio_dev)
+		return -ENODEV;
+
+	vf_id = pci_iov_vf_id(pdev);
+	if (vf_id < 0)
+		return vf_id;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->offset = offset;
+	sg_init_one(&data_sg, data, sizeof(*data));
+	sg_init_one(&result_sg, buf, size);
+	cmd.opcode = cpu_to_le16(opcode);
+	cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+	cmd.group_member_id = cpu_to_le64(vf_id + 1);
+	cmd.data_sg = &data_sg;
+	cmd.result_sg = &result_sg;
+	ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+
+	kfree(data);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_io_read);
+
+/*
+ * virtio_pci_admin_legacy_io_notify_info - Read the queue notification
+ * information for legacy interface
+ * @dev: VF pci_dev
+ * @req_bar_flags: requested bar flags
+ * @bar: on output the BAR number of the member device
+ * @bar_offset: on output the offset within bar
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int virtio_pci_admin_legacy_io_notify_info(struct pci_dev *pdev,
+					   u8 req_bar_flags, u8 *bar,
+					   u64 *bar_offset)
+{
+	struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
+	struct virtio_admin_cmd_notify_info_result *result;
+	struct virtio_admin_cmd cmd = {};
+	struct scatterlist result_sg;
+	int vf_id;
+	int ret;
+
+	if (!virtio_dev)
+		return -ENODEV;
+
+	vf_id = pci_iov_vf_id(pdev);
+	if (vf_id < 0)
+		return vf_id;
+
+	result = kzalloc(sizeof(*result), GFP_KERNEL);
+	if (!result)
+		return -ENOMEM;
+
+	sg_init_one(&result_sg, result, sizeof(*result));
+	cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO);
+	cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
+	cmd.group_member_id = cpu_to_le64(vf_id + 1);
+	cmd.result_sg = &result_sg;
+	ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
+	if (!ret) {
+		struct virtio_admin_cmd_notify_info_data *entry;
+		int i;
+
+		ret = -ENOENT;
+		for (i = 0; i < VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO; i++) {
+			entry = &result->entries[i];
+			if (entry->flags == VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_END)
+				break;
+			if (entry->flags != req_bar_flags)
+				continue;
+			*bar = entry->bar;
+			*bar_offset = le64_to_cpu(entry->offset);
+			ret = 0;
+			break;
+		}
+	}
+
+	kfree(result);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_io_notify_info);
+
  static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
  	.get		= NULL,
  	.set		= NULL,
diff --git a/include/linux/virtio_pci_admin.h b/include/linux/virtio_pci_admin.h
new file mode 100644
index 000000000000..cb916a4bc1b1
--- /dev/null
+++ b/include/linux/virtio_pci_admin.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_VIRTIO_PCI_ADMIN_H
+#define _LINUX_VIRTIO_PCI_ADMIN_H
+
+#include <linux/types.h>
+#include <linux/pci.h>
+
+int virtio_pci_admin_list_use(struct pci_dev *pdev, u8 *buf, int buf_size);
+int virtio_pci_admin_list_query(struct pci_dev *pdev, u8 *buf, int buf_size);
+int virtio_pci_admin_legacy_io_write(struct pci_dev *pdev, u16 opcode,
+				     u8 offset, u8 size, u8 *buf);
+int virtio_pci_admin_legacy_io_read(struct pci_dev *pdev, u16 opcode,
+				    u8 offset, u8 size, u8 *buf);
+int virtio_pci_admin_legacy_io_notify_info(struct pci_dev *pdev,
+					   u8 req_bar_flags, u8 *bar,
+					   u64 *bar_offset);
+
+#endif /* _LINUX_VIRTIO_PCI_ADMIN_H */
--
2.27.0





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