From: Jason Wang <jasowang@redhat.com>
To: Stefano Garzarella <sgarzare@redhat.com>,
virtualization@lists.linux-foundation.org
Cc: Stefan Hajnoczi <stefanha@redhat.com>,
Laurent Vivier <lvivier@redhat.com>,
linux-kernel@vger.kernel.org, Eli Cohen <elic@nvidia.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Max Gurtovoy <mgurtovoy@nvidia.com>
Subject: Re: [PATCH RFC 04/12] vdpa: add vdpa simulator for block device
Date: Mon, 16 Nov 2020 12:10:19 +0800 [thread overview]
Message-ID: <061b5093-ef1c-a7d8-495e-1fe338b8b097@redhat.com> (raw)
In-Reply-To: <20201113134712.69744-5-sgarzare@redhat.com>
On 2020/11/13 下午9:47, Stefano Garzarella wrote:
> From: Max Gurtovoy <mgurtovoy@nvidia.com>
>
> This will allow running vDPA for virtio block protocol.
>
> Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
> [sgarzare: various cleanups/fixes]
> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
> ---
> v1:
> - Removed unused headers
> - Used cpu_to_vdpasim*() to store config fields
> - Replaced 'select VDPA_SIM' with 'depends on VDPA_SIM' since selected
> option can not depend on other [Jason]
> - Start with a single queue for now [Jason]
> - Add comments to memory barriers
> ---
> drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 124 +++++++++++++++++++++++++++
> drivers/vdpa/Kconfig | 9 ++
> drivers/vdpa/vdpa_sim/Makefile | 1 +
> 3 files changed, 134 insertions(+)
> create mode 100644 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> new file mode 100644
> index 000000000000..386dbb2f7138
> --- /dev/null
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> @@ -0,0 +1,124 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * VDPA simulator for block device.
> + *
> + * Copyright (c) 2020, Mellanox Technologies. All rights reserved.
> + *
> + */
> +
> +#include <linux/module.h>
> +
> +#include "vdpa_sim.h"
> +
> +#define VDPASIM_BLK_FEATURES ((1ULL << VIRTIO_BLK_F_SIZE_MAX) | \
> + (1ULL << VIRTIO_BLK_F_SEG_MAX) | \
> + (1ULL << VIRTIO_BLK_F_BLK_SIZE) | \
> + (1ULL << VIRTIO_BLK_F_TOPOLOGY) | \
> + (1ULL << VIRTIO_BLK_F_MQ))
> +
> +#define VDPASIM_BLK_CAPACITY 0x40000
> +#define VDPASIM_BLK_SIZE_MAX 0x1000
> +#define VDPASIM_BLK_SEG_MAX 32
> +#define VDPASIM_BLK_VQ_NUM 1
> +
> +static struct vdpasim *vdpasim_blk_dev;
> +
> +static void vdpasim_blk_work(struct work_struct *work)
> +{
> + struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
> + u8 status = VIRTIO_BLK_S_OK;
> + int i;
> +
> + spin_lock(&vdpasim->lock);
> +
> + if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
> + goto out;
> +
> + for (i = 0; i < VDPASIM_BLK_VQ_NUM; i++) {
> + struct vdpasim_virtqueue *vq = &vdpasim->vqs[i];
> +
> + if (!vq->ready)
> + continue;
> +
> + while (vringh_getdesc_iotlb(&vq->vring, &vq->iov, &vq->iov,
> + &vq->head, GFP_ATOMIC) > 0) {
> +
> + int write;
> +
> + vq->iov.i = vq->iov.used - 1;
> + write = vringh_iov_push_iotlb(&vq->vring, &vq->iov, &status, 1);
> + if (write <= 0)
> + break;
> +
> + /* Make sure data is wrote before advancing index */
> + smp_wmb();
> +
> + vringh_complete_iotlb(&vq->vring, vq->head, write);
> +
> + /* Make sure used is visible before rasing the interrupt. */
> + smp_wmb();
> +
> + if (vringh_need_notify_iotlb(&vq->vring) > 0)
> + vringh_notify(&vq->vring);
Do we initialize vrh->notify anywhere? And This seems duplicated with
the following vq->cb.
I think the correct way is to initialize vrh->notify and use
vringh_need_notify_iotlb()/vringh_notify() instead of the vq->cb here.
And while at it, it's better to convert net simulator to do the same.
Thanks
> +
> + local_bh_disable();
> + if (vq->cb)
> + vq->cb(vq->private);
> + local_bh_enable();
> + }
> + }
> +out:
> + spin_unlock(&vdpasim->lock);
> +
> +}
> +
> +static int __init vdpasim_blk_init(void)
> +{
> + struct vdpasim_init_attr attr = {};
> + struct virtio_blk_config *config;
> + int ret;
> +
> + attr.device_id = VIRTIO_ID_BLOCK;
> + attr.features = VDPASIM_FEATURES | VDPASIM_BLK_FEATURES;
> + attr.work_fn = vdpasim_blk_work;
> + vdpasim_blk_dev = vdpasim_create(&attr);
> + if (IS_ERR(vdpasim_blk_dev)) {
> + ret = PTR_ERR(vdpasim_blk_dev);
> + goto out;
> + }
> +
> + config = (struct virtio_blk_config *)vdpasim_blk_dev->config;
> + config->capacity = cpu_to_vdpasim64(vdpasim_blk_dev, VDPASIM_BLK_CAPACITY);
> + config->size_max = cpu_to_vdpasim32(vdpasim_blk_dev, VDPASIM_BLK_SIZE_MAX);
> + config->seg_max = cpu_to_vdpasim32(vdpasim_blk_dev, VDPASIM_BLK_SEG_MAX);
> + config->num_queues = cpu_to_vdpasim16(vdpasim_blk_dev, VDPASIM_BLK_VQ_NUM);
> + config->min_io_size = cpu_to_vdpasim16(vdpasim_blk_dev, 1);
> + config->opt_io_size = cpu_to_vdpasim32(vdpasim_blk_dev, 1);
> + config->blk_size = cpu_to_vdpasim32(vdpasim_blk_dev, 512);
> +
> + ret = vdpa_register_device(&vdpasim_blk_dev->vdpa);
> + if (ret)
> + goto put_dev;
> +
> + return 0;
> +
> +put_dev:
> + put_device(&vdpasim_blk_dev->vdpa.dev);
> +out:
> + return ret;
> +}
> +
> +static void __exit vdpasim_blk_exit(void)
> +{
> + struct vdpa_device *vdpa = &vdpasim_blk_dev->vdpa;
> +
> + vdpa_unregister_device(vdpa);
> +}
> +
> +module_init(vdpasim_blk_init)
> +module_exit(vdpasim_blk_exit)
> +
> +MODULE_VERSION(DRV_VERSION);
> +MODULE_LICENSE(DRV_LICENSE);
> +MODULE_AUTHOR("Max Gurtovoy <mgurtovoy@nvidia.com>");
> +MODULE_DESCRIPTION("vDPA Device Simulator for block device");
> diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
> index fdb1a9267347..0fb63362cd5d 100644
> --- a/drivers/vdpa/Kconfig
> +++ b/drivers/vdpa/Kconfig
> @@ -24,6 +24,15 @@ config VDPA_SIM_NET
> to RX. This device is used for testing, prototyping and
> development of vDPA.
>
> +config VDPA_SIM_BLOCK
> + tristate "vDPA simulator for block device"
> + depends on VDPA_SIM
> + default n
> + help
> + vDPA block device simulator which terminates IO request in a
> + memory buffer. This device is used for testing, prototyping and
> + development of vDPA.
> +
> config IFCVF
> tristate "Intel IFC VF vDPA driver"
> depends on PCI_MSI
> diff --git a/drivers/vdpa/vdpa_sim/Makefile b/drivers/vdpa/vdpa_sim/Makefile
> index 79d4536d347e..d458103302f2 100644
> --- a/drivers/vdpa/vdpa_sim/Makefile
> +++ b/drivers/vdpa/vdpa_sim/Makefile
> @@ -1,3 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0
> obj-$(CONFIG_VDPA_SIM) += vdpa_sim.o
> obj-$(CONFIG_VDPA_SIM_NET) += vdpa_sim_net.o
> +obj-$(CONFIG_VDPA_SIM_BLOCK) += vdpa_sim_blk.o
next prev parent reply other threads:[~2020-11-16 4:10 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 13:47 [PATCH RFC 00/12] vdpa: generalize vdpa simulator and add block device Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 01/12] vhost-vdpa: add support for vDPA blk devices Stefano Garzarella
2020-11-17 10:57 ` Stefan Hajnoczi
2020-11-17 15:05 ` Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 02/12] vdpa: split vdpasim to core and net modules Stefano Garzarella
2020-11-16 4:00 ` Jason Wang
2020-11-16 9:39 ` Stefano Garzarella
2020-11-18 13:14 ` Stefano Garzarella
2020-11-19 6:16 ` Jason Wang
2020-11-13 13:47 ` [PATCH RFC 03/12] vdpa_sim: remove hard-coded virtq count Stefano Garzarella
2020-11-16 4:02 ` Jason Wang
2020-11-13 13:47 ` [PATCH RFC 04/12] vdpa: add vdpa simulator for block device Stefano Garzarella
2020-11-16 4:10 ` Jason Wang [this message]
2020-11-16 10:17 ` Stefano Garzarella
2020-11-17 11:11 ` Stefan Hajnoczi
2020-11-17 14:16 ` Stefano Garzarella
2020-11-17 16:43 ` Stefan Hajnoczi
2020-11-17 17:38 ` Stefano Garzarella
2020-11-18 11:23 ` Stefan Hajnoczi
2020-11-18 11:39 ` Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 05/12] vdpa_sim: remove the limit of IOTLB entries Stefano Garzarella
2020-11-16 4:12 ` Jason Wang
2020-11-16 10:22 ` Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 06/12] vdpa_sim: add struct vdpasim_device to store device properties Stefano Garzarella
2020-11-16 4:14 ` Jason Wang
2020-11-16 10:30 ` Stefano Garzarella
2020-11-17 11:23 ` Stefan Hajnoczi
2020-11-17 14:24 ` Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 07/12] vdpa_sim: move config management outside of the core Stefano Garzarella
2020-11-16 4:18 ` Jason Wang
2020-11-16 10:42 ` Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 08/12] vdpa_sim: use kvmalloc to allocate vdpasim->buffer Stefano Garzarella
2020-11-16 4:19 ` Jason Wang
2020-11-13 13:47 ` [PATCH RFC 09/12] vdpa_sim: make vdpasim->buffer size configurable Stefano Garzarella
2020-11-16 4:19 ` Jason Wang
2020-11-13 13:47 ` [PATCH RFC 10/12] vdpa_sim: split vdpasim_virtqueue's iov field in riov and wiov Stefano Garzarella
2020-11-16 4:21 ` Jason Wang
2020-11-17 11:27 ` Stefan Hajnoczi
2020-11-20 14:41 ` Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 11/12] vringh: allow vringh_iov_xfer() to skip bytes when ptr is NULL Stefano Garzarella
2020-11-16 4:32 ` Jason Wang
2020-11-16 11:48 ` Stefano Garzarella
2020-11-13 13:47 ` [PATCH RFC 12/12] vdpa_sim_blk: implement ramdisk behaviour Stefano Garzarella
2020-11-16 5:25 ` Jason Wang
2020-11-16 11:08 ` Stefano Garzarella
2020-11-16 9:50 ` Michael S. Tsirkin
2020-11-16 11:23 ` Stefano Garzarella
2020-11-17 11:36 ` Stefan Hajnoczi
2020-11-17 14:32 ` Stefano Garzarella
2020-11-16 3:37 ` [PATCH RFC 00/12] vdpa: generalize vdpa simulator and add block device Jason Wang
2020-11-16 8:53 ` Stefano Garzarella
2020-12-18 11:38 ` Stefano Garzarella
2020-12-21 3:16 ` Jason Wang
2020-12-21 11:14 ` Stefano Garzarella
2020-12-22 2:44 ` Jason Wang
2020-12-22 10:57 ` Stefano Garzarella
2020-12-22 12:29 ` Jason Wang
2020-12-22 12:56 ` Jason Wang
2020-12-22 13:23 ` Stefano Garzarella
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