UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

vduse: Support specifying bounce buffer size via sysfs 

As discussed in [1], this adds sysfs interface to support
specifying bounce buffer size in virtio-vdpa case. It would
be a performance tuning parameter for high throughput workloads.

[1] https://lore.kernel.org/netdev/e8f25a35-9d45-69f9-795d-bdbbb90337a3@redhat.com/

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230323053043.35-12-xieyongji@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xie Yongji 2023-03-23 13:30:43 +08:00 committed by Michael S. Tsirkin
parent d4438d23ee
commit b774f93d87
1 changed files with 44 additions and 1 deletions
drivers/vdpa/vdpa_user
vduse_dev.c

45
drivers/vdpa/vdpa_user/vduse_dev.c
View File

@ -37,8 +37,11 @@
#define DRV_LICENSE "GPL v2"
#define VDUSE_DEV_MAX (1U << MINORBITS)
#define VDUSE_MAX_BOUNCE_SIZE (1024 * 1024 * 1024)
#define VDUSE_MIN_BOUNCE_SIZE (1024 * 1024)
#define VDUSE_BOUNCE_SIZE (64 * 1024 * 1024)
#define VDUSE_IOVA_SIZE (128 * 1024 * 1024)
/* 128 MB reserved for virtqueue creation */
#define VDUSE_IOVA_SIZE (VDUSE_MAX_BOUNCE_SIZE + 128 * 1024 * 1024)
#define VDUSE_MSG_DEFAULT_TIMEOUT 30
#define IRQ_UNBOUND -1
@ -1715,8 +1718,48 @@ static ssize_t msg_timeout_store(struct device *device,
static DEVICE_ATTR_RW(msg_timeout);
static ssize_t bounce_size_show(struct device *device,
struct device_attribute *attr, char *buf)
{
struct vduse_dev *dev = dev_get_drvdata(device);
return sysfs_emit(buf, "%u\n", dev->bounce_size);
}
static ssize_t bounce_size_store(struct device *device,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct vduse_dev *dev = dev_get_drvdata(device);
unsigned int bounce_size;
int ret;
ret = -EPERM;
mutex_lock(&dev->domain_lock);
if (dev->domain)
goto unlock;
ret = kstrtouint(buf, 10, &bounce_size);
if (ret < 0)
goto unlock;
ret = -EINVAL;
if (bounce_size > VDUSE_MAX_BOUNCE_SIZE ||
bounce_size < VDUSE_MIN_BOUNCE_SIZE)
goto unlock;
dev->bounce_size = bounce_size & PAGE_MASK;
ret = count;
unlock:
mutex_unlock(&dev->domain_lock);
return ret;
}
static DEVICE_ATTR_RW(bounce_size);
static struct attribute *vduse_dev_attrs[] = {
&dev_attr_msg_timeout.attr,
&dev_attr_bounce_size.attr,
NULL
};