ieee820154: add max csma backoffs setting support

[deliverable/linux.git] / net / ieee802154 / nl802154.c

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index d1cf3021ff3640ae8bb50ec4437ffb86beb2e7d7..af383553bdd2f9253359ac3fda087a3de0847a21 100644 (file)
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -642,6 +642,31 @@ nl802154_set_backoff_exponent(struct sk_buff *skb, struct genl_info *info)
        return rdev_set_backoff_exponent(rdev, wpan_dev, min_be, max_be);
 }
 
+static int
+nl802154_set_max_csma_backoffs(struct sk_buff *skb, struct genl_info *info)
+{
+       struct cfg802154_registered_device *rdev = info->user_ptr[0];
+       struct net_device *dev = info->user_ptr[1];
+       struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
+       u8 max_csma_backoffs;
+
+       /* conflict here while other running iface settings */
+       if (netif_running(dev))
+               return -EBUSY;
+
+       if (!info->attrs[NL802154_ATTR_MAX_CSMA_BACKOFFS])
+               return -EINVAL;
+
+       max_csma_backoffs = nla_get_u8(
+                       info->attrs[NL802154_ATTR_MAX_CSMA_BACKOFFS]);
+
+       /* check 802.15.4 constraints */
+       if (max_csma_backoffs > 5)
+               return -EINVAL;
+
+       return rdev_set_max_csma_backoffs(rdev, wpan_dev, max_csma_backoffs);
+}
+
 #define NL802154_FLAG_NEED_WPAN_PHY    0x01
 #define NL802154_FLAG_NEED_NETDEV      0x02
 #define NL802154_FLAG_NEED_RTNL                0x04
@@ -784,6 +809,14 @@ static const struct genl_ops nl802154_ops[] = {
                .internal_flags = NL802154_FLAG_NEED_NETDEV |
                                  NL802154_FLAG_NEED_RTNL,
        },
+       {
+               .cmd = NL802154_CMD_SET_MAX_CSMA_BACKOFFS,
+               .doit = nl802154_set_max_csma_backoffs,
+               .policy = nl802154_policy,
+               .flags = GENL_ADMIN_PERM,
+               .internal_flags = NL802154_FLAG_NEED_NETDEV |
+                                 NL802154_FLAG_NEED_RTNL,
+       },
 };
 
 /* initialisation/exit functions */