vDPA: allow userspace to query features of a vDPA device

This commit adds a new vDPA netlink attribution VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES. Userspace can query features of vDPA devices through this new attr. This commit invokes vdpa_config_ops.get_config() rather than vdpa_get_config_unlocked() to read the device config spcae, so no races in vdpa_set_features_unlocked() Userspace tool iproute2 example: $ vdpa dev config show vdpa0 vdpa0: mac 00:e8:ca:11:be:05 link up link_announce false max_vq_pairs 4 mtu 1500 negotiated_features MRG_RXBUF CTRL_VQ MQ VERSION_1 ACCESS_PLATFORM dev_features MTU MAC MRG_RXBUF CTRL_VQ MQ ANY_LAYOUT VERSION_1 ACCESS_PLATFORM

Zhu Lingshan committed 4 years ago

Commit 22856511 parent e60d6402 files · +15 −5Browse files

Showing the changes to include/uapi/linux (1 of 2 files). Show all

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include/uapi/linux/vdpa.h+4−0

@@ -46,6 +46,7 @@ enum vdpa_attr { · 45 unmodified lines
46	46
47	47	VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
48	48	VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, /* u32 */
	49	+ /* virtio features that are supported by the vDPA management device */
49	50	VDPA_ATTR_DEV_SUPPORTED_FEATURES, /* u64 */
50	51
51	52	VDPA_ATTR_DEV_QUEUE_INDEX, /* u32 */
@@ -54,6 +55,9 @@ enum vdpa_attr { · 2 unmodified lines
54	55
55	56	VDPA_ATTR_DEV_FEATURES, /* u64 */
56	57
	58	+ /* virtio features that are supported by the vDPA device */
	59	+ VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, /* u64 */
	60	+
57	61	/* new attributes must be added above here */
58	62	VDPA_ATTR_MAX,
59	63	};