vdpa: Add support for returning device configuration information

Add netlink attribute to store the negotiated features. This can be used by userspace to get the current state of the vdpa instance. Examples: $ vdpa dev config show vdpa-a vdpa-a: mac 00:00:00:00:88:88 link up link_announce false max_vq_pairs 16 mtu 1500 negotiated_features CSUM GUEST_CSUM MTU MAC HOST_TSO4 HOST_TSO6 STATUS \ CTRL_VQ MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM $ vdpa -j dev config show vdpa-a {"config":{"vdpa-a":{"mac":"00:00:00:00:88:88","link ":"up","link_announce":false, \ "max_vq_pairs":16,"mtu":1500,"negotiated_features":["CSUM","GUEST_CSUM","MTU","MAC", \ "HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ","MQ","CTRL_MAC_ADDR","VERSION_1", \ "ACCESS_PLATFORM"]}}} $ vdpa -jp dev config show vdpa-a { "config": { "vdpa-a": { "mac": "00:00:00:00:88:88", "link ": "up", "link_announce ": false, "max_vq_pairs": 16, "mtu": 1500, "negotiated_features": [ "CSUM","GUEST_CSUM","MTU","MAC","HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ","MQ", \ "CTRL_MAC_ADDR","VERSION_1","ACCESS_PLATFORM" ] } } }

Eli Cohen committed 4 years ago

Commit 612f3301 parent 75560522 files · +7 −0Browse 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

@@ -23,6 +23,9 @@ enum vdpa_command { · 22 unmodified lines
23	23	enum vdpa_attr {
24	24	VDPA_ATTR_UNSPEC,
25	25
	26	+ /* Pad attribute for 64b alignment */
	27	+ VDPA_ATTR_PAD = VDPA_ATTR_UNSPEC,
	28	+
26	29	/* bus name (optional) + dev name together make the parent device handle */
27	30	VDPA_ATTR_MGMTDEV_BUS_NAME, /* string */
28	31	VDPA_ATTR_MGMTDEV_DEV_NAME, /* string */
@@ -40,6 +43,7 @@ enum vdpa_attr { · 11 unmodified lines
40	43	VDPA_ATTR_DEV_NET_CFG_MAX_VQP, /* u16 */
41	44	VDPA_ATTR_DEV_NET_CFG_MTU, /* u16 */
42	45
	46	+ VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
43	47	/* new attributes must be added above here */
44	48	VDPA_ATTR_MAX,
45	49	};