[PATCH RFC 01/12] vhost-vdpa: add support for vDPA blk devices

Stefano Garzarella
2020-11-13T13:47:35Z

From: Max Gurtovoy <maxg@mellanox.com>

Currently only net devices can act as vDPA backends. Add an
infrastructure for block devices will basic feature list that will be
increased in the future.

Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
drivers/vhost/vdpa.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 2754f3069738..fb0411594963 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -22,6 +22,7 @@
#include <linux/nospec.h>
#include <linux/vhost.h>
#include <linux/virtio_net.h>
+#include <linux/virtio_blk.h>

#include "vhost.h"

@@ -194,6 +195,9 @@ static int vhost_vdpa_config_validate(struct vhost_vdpa *v,
case VIRTIO_ID_NET:
size = sizeof(struct virtio_net_config);
break;
+ case VIRTIO_ID_BLOCK:
+ size = sizeof(struct virtio_blk_config);
+ break;
}

if (c->len == 0)
@@ -975,12 +979,13 @@ static void vhost_vdpa_release_dev(struct device *device)
static int vhost_vdpa_probe(struct vdpa_device *vdpa)
{
const struct vdpa_config_ops *ops = vdpa->config;
+ u32 device_id = ops->get_device_id(vdpa);
struct vhost_vdpa *v;
int minor;
int r;

- /* Currently, we only accept the network devices. */
- if (ops->get_device_id(vdpa) != VIRTIO_ID_NET)
+ /* Currently, we only accept the network and block devices. */
+ if (device_id != VIRTIO_ID_NET && device_id != VIRTIO_ID_BLOCK)
return -ENOTSUPP;

v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
@@ -998,7 +1003,7 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
v->minor = minor;
v->vdpa = vdpa;
v->nvqs = vdpa->nvqs;
- v->virtio_id = ops->get_device_id(vdpa);
+ v->virtio_id = device_id;

device_initialize(&v->dev);
v->dev.release = vhost_vdpa_release_dev;
--
2.26.2