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Commit 656a999e authored by Alexander Aring's avatar Alexander Aring Committed by Marcel Holtmann
Browse files

ieee820154: add backoff exponent setting support 



This patch adds support for setting backoff exponents via nl802154
framework.

Signed-off-by: default avatarAlexander Aring <alex.aring@gmail.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 9830c62a

include/net/cfg802154.h

+3 −0
Original line number Diff line number Diff line
@@ -42,6 +42,9 @@ struct cfg802154_ops { 
			      struct wpan_dev *wpan_dev, u16 pan_id);

	int	(*set_short_addr)(struct wpan_phy *wpan_phy,

				  struct wpan_dev *wpan_dev, u16 short_addr);

	int	(*set_backoff_exponent)(struct wpan_phy *wpan_phy,

					struct wpan_dev *wpan_dev, u8 min_be,

					u8 max_be);

};



struct wpan_phy {

net/ieee802154/nl802154.c

+34 −0
Original line number Diff line number Diff line
@@ -616,6 +616,32 @@ static int nl802154_set_short_addr(struct sk_buff *skb, struct genl_info *info) 
	return rdev_set_short_addr(rdev, wpan_dev, short_addr);

}



static int

nl802154_set_backoff_exponent(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 min_be, max_be;



	/* should be set on netif open inside phy settings */

	if (netif_running(dev))

		return -EBUSY;



	if (!info->attrs[NL802154_ATTR_MIN_BE] ||

	    !info->attrs[NL802154_ATTR_MAX_BE])

		return -EINVAL;



	min_be = nla_get_u8(info->attrs[NL802154_ATTR_MIN_BE]);

	max_be = nla_get_u8(info->attrs[NL802154_ATTR_MAX_BE]);



	/* check 802.15.4 constraints */

	if (max_be < 3 || max_be > 8 || min_be > max_be)

		return -EINVAL;



	return rdev_set_backoff_exponent(rdev, wpan_dev, min_be, max_be);

}



#define NL802154_FLAG_NEED_WPAN_PHY	0x01

#define NL802154_FLAG_NEED_NETDEV	0x02

#define NL802154_FLAG_NEED_RTNL		0x04
@@ -750,6 +776,14 @@ static const struct genl_ops nl802154_ops[] = { 
		.internal_flags = NL802154_FLAG_NEED_NETDEV |

				  NL802154_FLAG_NEED_RTNL,

	},

	{

		.cmd = NL802154_CMD_SET_BACKOFF_EXPONENT,

		.doit = nl802154_set_backoff_exponent,

		.policy = nl802154_policy,

		.flags = GENL_ADMIN_PERM,

		.internal_flags = NL802154_FLAG_NEED_NETDEV |

				  NL802154_FLAG_NEED_RTNL,

	},

};



/* initialisation/exit functions */

net/ieee802154/rdev-ops.h

+9 −0
Original line number Diff line number Diff line
@@ -41,4 +41,13 @@ rdev_set_short_addr(struct cfg802154_registered_device *rdev, 
	return rdev->ops->set_short_addr(&rdev->wpan_phy, wpan_dev, short_addr);

}



static inline int

rdev_set_backoff_exponent(struct cfg802154_registered_device *rdev,

			  struct wpan_dev *wpan_dev, const u8 min_be,

			  const u8 max_be)

{

	return rdev->ops->set_backoff_exponent(&rdev->wpan_phy, wpan_dev,

					       min_be, max_be);

}



#endif /* __CFG802154_RDEV_OPS */

net/mac802154/cfg.c

+18 −0
Original line number Diff line number Diff line
@@ -83,6 +83,23 @@ static int ieee802154_set_pan_id(struct wpan_phy *wpan_phy, 
	return 0;

}



static int

ieee802154_set_backoff_exponent(struct wpan_phy *wpan_phy,

				struct wpan_dev *wpan_dev,

				const u8 min_be, const u8 max_be)

{

	struct ieee802154_local *local = wpan_phy_priv(wpan_phy);



	ASSERT_RTNL();



	if (!(local->hw.flags & IEEE802154_HW_CSMA_PARAMS))

		return -EOPNOTSUPP;



	wpan_dev->min_be = min_be;

	wpan_dev->max_be = max_be;

	return 0;

}



static int

ieee802154_set_short_addr(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev,

			  const u16 short_addr)
@@ -114,4 +131,5 @@ const struct cfg802154_ops mac802154_config_ops = { 
	.set_channel = ieee802154_set_channel,

	.set_pan_id = ieee802154_set_pan_id,

	.set_short_addr = ieee802154_set_short_addr,

	.set_backoff_exponent = ieee802154_set_backoff_exponent,

};