On Thu, Sep 21, 2023 at 03:40:39PM +0300, Yishai Hadas wrote:
> Expose admin commands over the virtio device, to be used by the
> vfio-virtio driver in the next patches.
>
> It includes: list query/use, legacy write/read, read notify_info.
>
> Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxx>
> ---
> drivers/vfio/pci/virtio/cmd.c | 146 ++++++++++++++++++++++++++++++++++
> drivers/vfio/pci/virtio/cmd.h | 27 +++++++
> 2 files changed, 173 insertions(+)
> create mode 100644 drivers/vfio/pci/virtio/cmd.c
> create mode 100644 drivers/vfio/pci/virtio/cmd.h
>
> diff --git a/drivers/vfio/pci/virtio/cmd.c b/drivers/vfio/pci/virtio/cmd.c
> new file mode 100644
> index 000000000000..f068239cdbb0
> --- /dev/null
> +++ b/drivers/vfio/pci/virtio/cmd.c
> @@ -0,0 +1,146 @@
> +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
> +/*
> + * Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved
> + */
> +
> +#include "cmd.h"
> +
> +int virtiovf_cmd_list_query(struct pci_dev *pdev, u8 *buf, int buf_size)
> +{
> + struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
> + struct scatterlist out_sg;
> + struct virtio_admin_cmd cmd = {};
> +
> + if (!virtio_dev)
> + return -ENOTCONN;
> +
> + sg_init_one(&out_sg, buf, buf_size);
> + cmd.opcode = VIRTIO_ADMIN_CMD_LIST_QUERY;
> + cmd.group_type = VIRTIO_ADMIN_GROUP_TYPE_SRIOV;
> + cmd.result_sg = &out_sg;
> +
> + return virtio_admin_cmd_exec(virtio_dev, &cmd);
> +}
> +
in/out seem all wrong here. In virtio terminology, in means from
device to driver, out means from driver to device.
> +int virtiovf_cmd_list_use(struct pci_dev *pdev, u8 *buf, int buf_size)
> +{
> + struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev);
> + struct scatterlist in_sg;
> + struct virtio_admin_cmd cmd = {};
> +
> + if (!virtio_dev)
> + return -ENOTCONN;
> +
> + sg_init_one(&in_sg, buf, buf_size);
> + cmd.opcode = VIRTIO_ADMIN_CMD_LIST_USE;
> + cmd.group_type = VIRTIO_ADMIN_GROUP_TYPE_SRIOV;
> + cmd.data_sg = &in_sg;
> +
> + return virtio_admin_cmd_exec(virtio_dev, &cmd);
> +}
> +
> +int virtiovf_cmd_lr_write(struct virtiovf_pci_core_device *virtvdev, u16 opcode,
what is _lr short for?
> + u8 offset, u8 size, u8 *buf)
> +{
> + struct virtio_device *virtio_dev =
> + virtio_pci_vf_get_pf_dev(virtvdev->core_device.pdev);
> + struct virtio_admin_cmd_data_lr_write *in;
> + struct scatterlist in_sg;
> + struct virtio_admin_cmd cmd = {};
> + int ret;
> +
> + if (!virtio_dev)
> + return -ENOTCONN;
> +
> + in = kzalloc(sizeof(*in) + size, GFP_KERNEL);
> + if (!in)
> + return -ENOMEM;
> +
> + in->offset = offset;
> + memcpy(in->registers, buf, size);
> + sg_init_one(&in_sg, in, sizeof(*in) + size);
> + cmd.opcode = opcode;
> + cmd.group_type = VIRTIO_ADMIN_GROUP_TYPE_SRIOV;
> + cmd.group_member_id = virtvdev->vf_id + 1;
weird. why + 1?
> + cmd.data_sg = &in_sg;
> + ret = virtio_admin_cmd_exec(virtio_dev, &cmd);
> +
> + kfree(in);
> + return ret;
> +}
How do you know it's safe to send this command, in particular at
this time? This seems to be doing zero checks, and zero synchronization
with the PF driver.
> +
> +int virtiovf_cmd_lr_read(struct virtiovf_pci_core_device *virtvdev, u16 opcode,
> + u8 offset, u8 size, u8 *buf)
> +{
> + struct virtio_device *virtio_dev =
> + virtio_pci_vf_get_pf_dev(virtvdev->core_device.pdev);
> + struct virtio_admin_cmd_data_lr_read *in;
> + struct scatterlist in_sg, out_sg;
> + struct virtio_admin_cmd cmd = {};
> + int ret;
> +
> + if (!virtio_dev)
> + return -ENOTCONN;
> +
> + in = kzalloc(sizeof(*in), GFP_KERNEL);
> + if (!in)
> + return -ENOMEM;
> +
> + in->offset = offset;
> + sg_init_one(&in_sg, in, sizeof(*in));
> + sg_init_one(&out_sg, buf, size);
> + cmd.opcode = opcode;
> + cmd.group_type = VIRTIO_ADMIN_GROUP_TYPE_SRIOV;
> + cmd.data_sg = &in_sg;
> + cmd.result_sg = &out_sg;
> + cmd.group_member_id = virtvdev->vf_id + 1;
> + ret = virtio_admin_cmd_exec(virtio_dev, &cmd);
> +
> + kfree(in);
> + return ret;
> +}
> +
> +int virtiovf_cmd_lq_read_notify(struct virtiovf_pci_core_device *virtvdev,
and what is lq short for?
> + u8 req_bar_flags, u8 *bar, u64 *bar_offset)
> +{
> + struct virtio_device *virtio_dev =
> + virtio_pci_vf_get_pf_dev(virtvdev->core_device.pdev);
> + struct virtio_admin_cmd_notify_info_result *out;
> + struct scatterlist out_sg;
> + struct virtio_admin_cmd cmd = {};
> + int ret;
> +
> + if (!virtio_dev)
> + return -ENOTCONN;
> +
> + out = kzalloc(sizeof(*out), GFP_KERNEL);
> + if (!out)
> + return -ENOMEM;
> +
> + sg_init_one(&out_sg, out, sizeof(*out));
> + cmd.opcode = VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO;
> + cmd.group_type = VIRTIO_ADMIN_GROUP_TYPE_SRIOV;
> + cmd.result_sg = &out_sg;
> + cmd.group_member_id = virtvdev->vf_id + 1;
> + ret = virtio_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 = &out->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(out);
> + return ret;
> +}
> diff --git a/drivers/vfio/pci/virtio/cmd.h b/drivers/vfio/pci/virtio/cmd.h
> new file mode 100644
> index 000000000000..c2a3645f4b90
> --- /dev/null
> +++ b/drivers/vfio/pci/virtio/cmd.h
> @@ -0,0 +1,27 @@
> +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
> +/*
> + * Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
> + */
> +
> +#ifndef VIRTIO_VFIO_CMD_H
> +#define VIRTIO_VFIO_CMD_H
> +
> +#include <linux/kernel.h>
> +#include <linux/virtio.h>
> +#include <linux/vfio_pci_core.h>
> +#include <linux/virtio_pci.h>
> +
> +struct virtiovf_pci_core_device {
> + struct vfio_pci_core_device core_device;
> + int vf_id;
> +};
> +
> +int virtiovf_cmd_list_query(struct pci_dev *pdev, u8 *buf, int buf_size);
> +int virtiovf_cmd_list_use(struct pci_dev *pdev, u8 *buf, int buf_size);
> +int virtiovf_cmd_lr_write(struct virtiovf_pci_core_device *virtvdev, u16 opcode,
> + u8 offset, u8 size, u8 *buf);
> +int virtiovf_cmd_lr_read(struct virtiovf_pci_core_device *virtvdev, u16 opcode,
> + u8 offset, u8 size, u8 *buf);
> +int virtiovf_cmd_lq_read_notify(struct virtiovf_pci_core_device *virtvdev,
> + u8 req_bar_flags, u8 *bar, u64 *bar_offset);
> +#endif /* VIRTIO_VFIO_CMD_H */
> --
> 2.27.0
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