bonding: add downdelay netlink support

Add IFLA_BOND_DOWNDELAY to allow get/set of bonding parameter
downdelay via netlink.

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index ae94b847ffcc..2914d649ee34 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -216,3 +216,32 @@ int bond_option_updelay_set(struct bonding *bond, int updelay)
 
         return 0;
 }
+
+int bond_option_downdelay_set(struct bonding *bond, int downdelay)
+{
+        if (!(bond->params.miimon)) {
+                pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
+                       bond->dev->name);
+                return -EPERM;
+        }
+
+        if (downdelay < 0) {
+                pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
+                       bond->dev->name, downdelay, 0, INT_MAX);
+                return -EINVAL;
+        } else {
+                if ((downdelay % bond->params.miimon) != 0) {
+                        pr_warn("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
+                                bond->dev->name, downdelay,
+                                bond->params.miimon,
+                                (downdelay / bond->params.miimon) *
+                                bond->params.miimon);
+                }
+                bond->params.downdelay = downdelay / bond->params.miimon;
+                pr_info("%s: Setting down delay to %d.\n",
+                        bond->dev->name,
+                        bond->params.downdelay * bond->params.miimon);
+        }
+
+        return 0;
+}