ip: allow set and display of link mode parameter
The kernel supports a link mode attribute (which can be dormant or default).
This attribute is used to control how the link watch engine
handles operstate transistion.
This adds a new parameter to ip link command to allow setting and
displaying the value.
---
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 8123da1..aea1a81 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -158,6 +158,20 @@
fprintf(f, "qlen %d", qlen);
}
+static const char *link_modes[] = {
+ "DEFAULT", "DORMANT"
+};
+
+static void print_linkmode(FILE *f, struct rtattr *tb)
+{
+ unsigned int mode = rta_getattr_u8(tb);
+
+ if (mode >= sizeof(link_modes) / sizeof(link_modes[0]))
+ fprintf(f, "mode %d ", mode);
+ else
+ fprintf(f, "mode %s ", link_modes[mode]);
+}
+
static void print_linktype(FILE *fp, struct rtattr *tb)
{
struct rtattr *linkinfo[IFLA_INFO_MAX+1];
@@ -398,9 +412,13 @@
SPRINT_BUF(b1);
fprintf(fp, "master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1));
}
+
if (tb[IFLA_OPERSTATE])
print_operstate(fp, *(__u8 *)RTA_DATA(tb[IFLA_OPERSTATE]));
-
+
+ if (do_link && tb[IFLA_LINKMODE])
+ print_linkmode(fp, tb[IFLA_LINKMODE]);
+
if (filter.showqueue)
print_queuelen(fp, tb);
diff --git a/ip/iplink.c b/ip/iplink.c
index 8481514..814a92c 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -132,6 +132,15 @@
return l;
}
+int get_link_mode(const char *mode)
+{
+ if (strcmp(mode, "default") == 0)
+ return IF_LINK_MODE_DEFAULT;
+ if (strcmp(mode, "dormant") == 0)
+ return IF_LINK_MODE_DORMANT;
+ return -1;
+}
+
#if IPLINK_IOCTL_COMPAT
static int have_rtnl_newlink = -1;
@@ -421,6 +430,13 @@
duparg("group", *argv);
if (rtnl_group_a2n(group, *argv))
invarg("Invalid \"group\" value\n", *argv);
+ } else if (strcmp(*argv, "mode") == 0) {
+ int mode;
+ NEXT_ARG();
+ mode = get_link_mode(*argv);
+ if (mode < 0)
+ invarg("Invalid link mode\n", *argv);
+ addattr8(&req->n, sizeof(*req), IFLA_LINKMODE, mode);
} else {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
diff --git a/man/man8/ip-link.8 b/man/man8/ip-link.8
index 8c63584..acc6d28 100644
--- a/man/man8/ip-link.8
+++ b/man/man8/ip-link.8
@@ -100,6 +100,9 @@
.B spoofchk { on | off }
] |
.br
+.B mode
+.IR LINKMODE " |"
+.br
.B master
.IR DEVICE
.br
@@ -249,6 +252,14 @@
.IR "NETNSNAME".
.TP
+.BI mode " LINKMODE"
+allows setting link mode which determines which RFC2863 operational state
+the device will transistion to when it is brought up. Setting
+.I dormant
+mode changes the behaviour so that device goes into DORMANT state instead
+of UP when driver is ready.
+
+.TP
.BI alias " NAME"
give the device a symbolic name for easy reference.
