[PATCH iproute2-next v2] ip link: Add support to get SR-IOV VF node GUID and port GUID

[Leon Romanovsky <leon@kernel.org>]

From: Danit Goldberg <danitg@mellanox.com>

Extend iplink to show VF GUIDs (IFLA_VF_IB_NODE_GUID, IFLA_VF_IB_PORT_GUID),
giving the ability for user-space application to print GUID values.
This ability is added to the one of setting new node GUID and port GUID values.

Suitable ip link command:
- ip link show <device>

For example:
- ip link set ib4 vf 0 node_guid 22:44:33:00:33:11:00:33
- ip link set ib4 vf 0 port_guid 10:21:33:12:00:11:22:10
- ip link show ib4
ib4: <BROADCAST,MULTICAST> mtu 4092 qdisc noop state DOWN mode DEFAULT group default qlen 256
link/infiniband 00:00:0a:2d:fe:80:00:00:00:00:00:00:ec:0d:9a:03:00:44:36:8d brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
vf 0     link/infiniband 00:00:0a:2d:fe:80:00:00:00:00:00:00:ec:0d:9a:03:00:44:36:8d brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff,
spoof checking off, NODE_GUID 22:44:33:00:33:11:00:33, PORT_GUID 10:21:33:12:00:11:22:10, link-state disable, trust off, query_rss off

Signed-off-by: Danit Goldberg <danitg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
Changelog:
 v1->v2: https://lore.kernel.org/linux-rdma/20191115152155.246821-1-leon@kernel.orga
 * Change to "b1" caused to extra padding in print of GUIDs, use real
   size instead of RTA_PAYLOAD().
 v0->v1: https://lore.kernel.org/linux-rdma/20191114133126.238128-2-leon@kernel.org
 * Use already preallocated "b1" buffer instead of new one.
---
 ip/ipaddress.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index b72eb7a1..fe41bbef 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -484,6 +484,24 @@ static void print_vfinfo(FILE *fp, struct ifinfomsg *ifi, struct rtattr *vfinfo)
 				   vf_spoofchk->setting);
 	}

+	if (vf[IFLA_VF_IB_NODE_GUID]) {
+		struct ifla_vf_guid *guid = RTA_DATA(vf[IFLA_VF_IB_NODE_GUID]);
+		uint64_t node_guid = ntohll(guid->guid);
+
+		print_string(PRINT_ANY, "node guid", ", NODE_GUID %s",
+			     ll_addr_n2a((const unsigned char *)&node_guid,
+					 sizeof(node_guid), ARPHRD_INFINIBAND,
+					 b1, sizeof(b1)));
+	}
+	if (vf[IFLA_VF_IB_PORT_GUID]) {
+		struct ifla_vf_guid *guid = RTA_DATA(vf[IFLA_VF_IB_PORT_GUID]);
+		uint64_t port_guid = ntohll(guid->guid);
+
+		print_string(PRINT_ANY, "port guid", ", PORT_GUID %s",
+			     ll_addr_n2a((const unsigned char *)&port_guid,
+					 sizeof(port_guid), ARPHRD_INFINIBAND,
+					 b1, sizeof(b1)));
+	}
 	if (vf[IFLA_VF_LINK_STATE]) {
 		struct ifla_vf_link_state *vf_linkstate =
 			RTA_DATA(vf[IFLA_VF_LINK_STATE]);
--
2.20.1