[PATCH] Add support for configuring Infiniband GUIDs

[Eli Cohen <eli@mellanox.com>]

Add two NLA's that allow configuration of Infiniband node or port GUIDs
by referencing the IPoIB net device set over then physical function. The
format to be used is as follows:

ip link set dev ib0 vf 0 node_guid 00:02:c9:03:00:21:6e:70
ip link set dev ib0 vf 0 port_guid 00:02:c9:03:00:21:6e:78

Signed-off-by: Eli Cohen <eli@mellanox.com>
---

Changes from V1:
Removed internal issue number and gerrit ID

 ip/iplink.c           | 40 ++++++++++++++++++++++++++++++++++++++++
 man/man8/ip-link.8.in | 12 +++++++++++-
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/ip/iplink.c b/ip/iplink.c
index b1f8a37922f5..0d2d750f2887 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -267,6 +267,30 @@ static int nl_get_ll_addr_len(unsigned int dev_index)
 	return RTA_PAYLOAD(tb[IFLA_ADDRESS]);
 }
 
+static int extract_guid(__u64 *guid, char *arg)
+{
+	__u64 ret;
+	int g[8];
+	int err;
+
+	err = sscanf(arg, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
+		     g, g + 1, g + 2, g + 3, g + 4, g + 5, g + 6, g + 7);
+	if (err != 8)
+		return -1;
+
+	ret = ((__u64)(g[0]) << 56) |
+	      ((__u64)(g[1]) << 48) |
+	      ((__u64)(g[2]) << 40) |
+	      ((__u64)(g[3]) << 32) |
+	      ((__u64)(g[4]) << 24) |
+	      ((__u64)(g[5]) << 16) |
+	      ((__u64)(g[6]) << 8) |
+	      ((__u64)(g[7]));
+	*guid = ret;
+
+	return 0;
+}
+
 static int iplink_parse_vf(int vf, int *argcp, char ***argvp,
 			   struct iplink_req *req, int dev_index)
 {
@@ -420,6 +444,22 @@ static int iplink_parse_vf(int vf, int *argcp, char ***argvp,
 				invarg("Invalid \"state\" value\n", *argv);
 			ivl.vf = vf;
 			addattr_l(&req->n, sizeof(*req), IFLA_VF_LINK_STATE, &ivl, sizeof(ivl));
+		} else if (matches(*argv, "node_guid") == 0) {
+			struct ifla_vf_guid ivg;
+
+			NEXT_ARG();
+			ivg.vf = vf;
+			if (extract_guid(&ivg.guid, *argv))
+				return -1;
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_IB_NODE_GUID, &ivg, sizeof(ivg));
+		} else if (matches(*argv, "port_guid") == 0) {
+			struct ifla_vf_guid ivg;
+
+			NEXT_ARG();
+			ivg.vf = vf;
+			if (extract_guid(&ivg.guid, *argv))
+				return -1;
+			addattr_l(&req->n, sizeof(*req), IFLA_VF_IB_PORT_GUID, &ivg, sizeof(ivg));
 		} else {
 			/* rewind arg */
 			PREV_ARG();
diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index 375b4d081408..07f0a94a289a 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -146,7 +146,11 @@ ip-link \- network device configuration
 .br
 .RB "[ " state " { " auto " | " enable " | " disable " } ]"
 .br
-.RB "[ " trust " { " on " | " off " } ] ]"
+.RB "[ " trust " { " on " | " off " } ]"
+.br
+.RB "[ " node_guid " eui64 ]"
+.br
+.RB "[ " port_guid " eui64 ] ]"
 .br
 .in -9
 .RB "[ " master
@@ -1191,6 +1195,12 @@ sent by the VF.
 .BI trust " on|off"
 - trust the specified VF user. This enables that VF user can set a specific feature
 which may impact security and/or performance. (e.g. VF multicast promiscuous mode)
+.sp
+.BI node_guid " eui64"
+- configure node GUID for the VF.
+.sp
+.BI port_guid " eui64"
+- configure port GUID for the VF.
 .in -8
 
 .TP
-- 
2.8.1