3 files changed, 57 insertions, 0 deletions

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index af383553bdd2..0e272c67c49b 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -667,6 +667,30 @@ nl802154_set_max_csma_backoffs(struct sk_buff *skb, struct genl_info *info)
         return rdev_set_max_csma_backoffs(rdev, wpan_dev, max_csma_backoffs);
 }
 
+static int
+nl802154_set_max_frame_retries(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;
+        s8 max_frame_retries;
+
+        if (netif_running(dev))
+                return -EBUSY;
+
+        if (!info->attrs[NL802154_ATTR_MAX_FRAME_RETRIES])
+                return -EINVAL;
+
+        max_frame_retries = nla_get_s8(
+                        info->attrs[NL802154_ATTR_MAX_FRAME_RETRIES]);
+
+        /* check 802.15.4 constraints */
+        if (max_frame_retries < -1 || max_frame_retries > 7)
+                return -EINVAL;
+
+        return rdev_set_max_frame_retries(rdev, wpan_dev, max_frame_retries);
+}
+
 #define NL802154_FLAG_NEED_WPAN_PHY     0x01
 #define NL802154_FLAG_NEED_NETDEV       0x02
 #define NL802154_FLAG_NEED_RTNL         0x04
@@ -817,6 +841,14 @@ static const struct genl_ops nl802154_ops[] = {
                 .internal_flags = NL802154_FLAG_NEED_NETDEV |
                                   NL802154_FLAG_NEED_RTNL,
         },
+        {
+                .cmd = NL802154_CMD_SET_MAX_FRAME_RETRIES,
+                .doit = nl802154_set_max_frame_retries,
+                .policy = nl802154_policy,
+                .flags = GENL_ADMIN_PERM,
+                .internal_flags = NL802154_FLAG_NEED_NETDEV |
+                                  NL802154_FLAG_NEED_RTNL,
+        },
 };
 
 /* initialisation/exit functions */
diff --git a/net/ieee802154/rdev-ops.h b/net/ieee802154/rdev-ops.h
index 263095c8686c..f9171aaf985e 100644
--- a/net/ieee802154/rdev-ops.h
+++ b/net/ieee802154/rdev-ops.h
@@ -59,4 +59,13 @@ rdev_set_max_csma_backoffs(struct cfg802154_registered_device *rdev,
                                                 max_csma_backoffs);
 }
 
+static inline int
+rdev_set_max_frame_retries(struct cfg802154_registered_device *rdev,
+                           struct wpan_dev *wpan_dev,
+                           const s8 max_frame_retries)
+{
+        return rdev->ops->set_max_frame_retries(&rdev->wpan_phy, wpan_dev,
+                                                max_frame_retries);
+}
+
 #endif /* __CFG802154_RDEV_OPS */
diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c
index d72feebb939d..a8f6eaa76d4d 100644
--- a/net/mac802154/cfg.c
+++ b/net/mac802154/cfg.c
@@ -140,6 +140,21 @@ static int ieee802154_set_max_csma_backoffs(struct wpan_phy *wpan_phy,
         return 0;
 }
 
+static int ieee802154_set_max_frame_retries(struct wpan_phy *wpan_phy,
+                                            struct wpan_dev *wpan_dev,
+                                            const s8 max_frame_retries)
+{
+        struct ieee802154_local *local = wpan_phy_priv(wpan_phy);
+
+        ASSERT_RTNL();
+
+        if (!(local->hw.flags & IEEE802154_HW_FRAME_RETRIES))
+                return -EOPNOTSUPP;
+
+        wpan_dev->frame_retries = max_frame_retries;
+        return 0;
+}
+
 const struct cfg802154_ops mac802154_config_ops = {
         .add_virtual_intf_deprecated = ieee802154_add_iface_deprecated,
         .del_virtual_intf_deprecated = ieee802154_del_iface_deprecated,
@@ -148,4 +163,5 @@ const struct cfg802154_ops mac802154_config_ops = {
         .set_short_addr = ieee802154_set_short_addr,
         .set_backoff_exponent = ieee802154_set_backoff_exponent,
         .set_max_csma_backoffs = ieee802154_set_max_csma_backoffs,
+        .set_max_frame_retries = ieee802154_set_max_frame_retries,
 };