This commit allows reporting the max size of any single segment of virtio-block devices to user space.
Signed-off-by: Zhu Lingshan <[email protected]> --- drivers/vdpa/vdpa.c | 17 +++++++++++++++++ include/uapi/linux/vdpa.h | 1 + 2 files changed, 18 insertions(+) diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index d5ccb618de2b..ee1472d32b0d 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -956,6 +956,20 @@ vdpa_dev_blk_capacity_config_fill(struct sk_buff *msg, val_u64, VDPA_ATTR_PAD); } +static int +vdpa_dev_blk_seg_size_config_fill(struct sk_buff *msg, u64 features, + const struct virtio_blk_config *config) +{ + u32 val_u32; + + if ((features & BIT_ULL(VIRTIO_BLK_F_SIZE_MAX)) == 0) + return 0; + + val_u32 = __virtio32_to_cpu(true, config->size_max); + + return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE, val_u32); +} + static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev, struct sk_buff *msg) { @@ -973,6 +987,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev, if (vdpa_dev_blk_capacity_config_fill(msg, &config)) return -EMSGSIZE; + if (vdpa_dev_blk_seg_size_config_fill(msg, features_device, &config)) + return -EMSGSIZE; + return 0; } diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h index 1bf69226cb96..586bce3c906a 100644 --- a/include/uapi/linux/vdpa.h +++ b/include/uapi/linux/vdpa.h @@ -57,6 +57,7 @@ enum vdpa_attr { VDPA_ATTR_DEV_FEATURES, /* u64 */ VDPA_ATTR_DEV_BLK_CFG_CAPACITY, /* u64 */ + VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE, /* u32 */ /* new attributes must be added above here */ VDPA_ATTR_MAX, -- 2.39.3
