ieee802154: add netlink APIs for smartMAC configuration

Introduce new netlink attributes for SET_PHY_ATTRS:
 * CSMA minimal backoff exponent
 * CSMA maximal backoff exponent
 * CSMA retry limit
 * frame retransmission limit

The CSMA attributes shall correspond to minBE, maxBE and maxCSMABackoffs of
802.15.4, respectively. The frame retransmission shall correspond to
maxFrameRetries of 802.15.4, unless given as -1: then the old behaviour
of the stack shall apply. For RF2xy, the old behaviour is to not do
channel sensing at all and simply send *right now*, which is not
intended behaviour for most applications and actually prohibited for
some channel/page combinations.

For all values except frame retransmission limit, the defaults of
802.15.4 apply. Frame retransmission limits are set to -1 to indicate
backward-compatible behaviour.

Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 24 insertions, 0 deletions

diff --git a/include/linux/nl802154.h b/include/linux/nl802154.h
index 0594a0a..e110b8c 100644
--- a/include/linux/nl802154.h
+++ b/include/linux/nl802154.h
@@ -74,6 +74,11 @@ enum {
 	IEEE802154_ATTR_LBT_ENABLED,
 	IEEE802154_ATTR_CCA_MODE,
 	IEEE802154_ATTR_CCA_ED_LEVEL,
+	IEEE802154_ATTR_CSMA_RETRIES,
+	IEEE802154_ATTR_CSMA_MIN_BE,
+	IEEE802154_ATTR_CSMA_MAX_BE,
+
+	IEEE802154_ATTR_FRAME_RETRIES,
 
 	__IEEE802154_ATTR_MAX,
 };
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index 15fe6bc..8ca3d04 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -131,6 +131,14 @@ struct ieee802154_dev {
  *	  Sets the CCA energy detection threshold in dBm. Called with pib_lock
  *	  held.
  *	  Returns either zero, or negative errno.
+ *
+ * set_csma_params
+ *	  Sets the CSMA parameter set for the PHY. Called with pib_lock held.
+ *	  Returns either zero, or negative errno.
+ *
+ * set_frame_retries
+ *	  Sets the retransmission attempt limit. Called with pib_lock held.
+ *	  Returns either zero, or negative errno.
  */
 struct ieee802154_ops {
 	struct module	*owner;
@@ -152,6 +160,10 @@ struct ieee802154_ops {
 	int		(*set_cca_mode)(struct ieee802154_dev *dev, u8 mode);
 	int		(*set_cca_ed_level)(struct ieee802154_dev *dev,
 					    s32 level);
+	int		(*set_csma_params)(struct ieee802154_dev *dev,
+					   u8 min_be, u8 max_be, u8 retries);
+	int		(*set_frame_retries)(struct ieee802154_dev *dev,
+					     s8 retries);
 };
 
 /* Basic interface to register ieee802154 device */
diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h
index 0b570ad..10ab0fc 100644
--- a/include/net/wpan-phy.h
+++ b/include/net/wpan-phy.h
@@ -46,6 +46,10 @@ struct wpan_phy {
 	u32 channels_supported[32];
 	s8 transmit_power;
 	u8 cca_mode;
+	u8 min_be;
+	u8 max_be;
+	u8 csma_retries;
+	s8 frame_retries;
 
 	bool lbt;
 	s32 cca_ed_level;
@@ -61,6 +65,9 @@ struct wpan_phy {
 	int (*set_lbt)(struct wpan_phy *phy, bool on);
 	int (*set_cca_mode)(struct wpan_phy *phy, u8 cca_mode);
 	int (*set_cca_ed_level)(struct wpan_phy *phy, int level);
+	int (*set_csma_params)(struct wpan_phy *phy, u8 min_be, u8 max_be,
+			       u8 retries);
+	int (*set_frame_retries)(struct wpan_phy *phy, s8 retries);
 
 	char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
 };