networkd: add support for bond options

The following bond options are supported by this patch.

MIIMonitorSec:
Specifies the frequency in milli-seconds that MII link
monitoring will occur.

UpDelaySec:
Specifies the delay time in milli-seconds to enable a link
after a link up status has been detected.

DownDelaySec:
Specifies the delay time in milli-seconds to disable a link
after a link failure has been detected.

changes:
1. Added gconf variables.
2. man page

conf:

[NetDev]
Name=bond1
Kind=bond

[Bond]
Mode=802.3ad
TransmitHashPolicy=layer2+3
LacpduTransmitRate=fast
MIIMonitorSec=1s
UpDelaySec=2s
DownDelaySec=8s

cat /proc/net/bonding/bond1
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer2+3 (2)
MII Status: up
MII Polling Interval (ms): 1000
Up Delay (ms): 2000
Down Delay (ms): 8000

802.3ad info
LACP rate: fast
Min links: 0
Aggregator selection policy (ad_select): stable
bond bond1 has no active aggregator

[tomegun: rephrased manpage, dropped bond_ prefix from variables]

1 files changed, 30 insertions, 0 deletions

diff --git a/src/network/networkd-netdev-bond.c b/src/network/networkd-netdev-bond.c
index e3f3333560..1f57083626 100644
--- a/src/network/networkd-netdev-bond.c
+++ b/src/network/networkd-netdev-bond.c
@@ -145,6 +145,36 @@ static int netdev_bond_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_m
                 }
         }
 
+        if (b->miimon != 0) {
+                r = sd_rtnl_message_append_u32(m, IFLA_BOND_MIIMON, b->miimon / 1000);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Could not append IFLA_BOND_BOND_MIIMON attribute: %s",
+                                         strerror(-r));
+                        return r;
+                }
+        }
+
+        if (b->downdelay != 0) {
+                r = sd_rtnl_message_append_u32(m, IFLA_BOND_DOWNDELAY, b->downdelay / 1000);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Could not append IFLA_BOND_DOWNDELAY attribute: %s",
+                                         strerror(-r));
+                        return r;
+                }
+        }
+
+        if (b->updelay != 0) {
+                r = sd_rtnl_message_append_u32(m, IFLA_BOND_UPDELAY, b->updelay / 1000);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Could not append IFLA_BOND_UPDELAY attribute: %s",
+                                         strerror(-r));
+                        return r;
+                }
+        }
+
         return 0;
 }