From 81f64e1d911550832b8065631c28c87c96ffca36 Mon Sep 17 00:00:00 2001 From: Zhu Lingshan Date: Mon, 19 Feb 2024 02:56:00 +0800 Subject: vDPA: report virtio-block max segments in a request to user space This commit allows vDPA reporting the maximum number of segments in a request of virtio-block devices to user space. Signed-off-by: Zhu Lingshan Message-Id: <20240218185606.13509-5-lingshan.zhu@intel.com> Signed-off-by: Michael S. Tsirkin --- drivers/vdpa/vdpa.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'drivers/vdpa') diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index d96dc2ad48aa..3e3c84bd0337 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -985,6 +985,20 @@ vdpa_dev_blk_block_size_config_fill(struct sk_buff *msg, u64 features, return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_BLK_SIZE, val_u32); } +static int +vdpa_dev_blk_seg_max_config_fill(struct sk_buff *msg, u64 features, + const struct virtio_blk_config *config) +{ + u32 val_u32; + + if ((features & BIT_ULL(VIRTIO_BLK_F_SEG_MAX)) == 0) + return 0; + + val_u32 = __virtio32_to_cpu(true, config->seg_max); + + return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SEG_MAX, val_u32); +} + static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev, struct sk_buff *msg) { @@ -1008,6 +1022,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev, if (vdpa_dev_blk_block_size_config_fill(msg, features_device, &config)) return -EMSGSIZE; + if (vdpa_dev_blk_seg_max_config_fill(msg, features_device, &config)) + return -EMSGSIZE; + return 0; } -- cgit v1.2.3