Listen-before-talk is an alternative to CSMA in uncoordinated networks
and prescribed by european regulations if one wants to have a device
with radio duty cycles above 10% (or less in some bands). Add a phy
property to enable/disable LBT in the phy, including support in the
at86rf230 driver for RF212 chips.
Signed-off-by: Phoebe Buckheister <phoebe.buckheis...@itwm.fraunhofer.de>
---
drivers/net/ieee802154/at86rf230.c | 11 +++++-
include/linux/nl802154.h | 1 +
include/net/mac802154.h | 6 ++++
include/net/wpan-phy.h | 3 ++
net/ieee802154/nl-phy.c | 69 +++++++++++++++++++++++++++---------
net/ieee802154/nl_policy.c | 1 +
net/mac802154/ieee802154_dev.c | 11 ++++++
7 files changed, 84 insertions(+), 18 deletions(-)
diff --git a/drivers/net/ieee802154/at86rf230.c
b/drivers/net/ieee802154/at86rf230.c
index 3a8b831..973811b 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -152,7 +152,7 @@ static inline int is_rf212(struct at86rf230_local *local)
#define SR_RESERVED_17_5 0x17, 0x08, 3
#define SR_AACK_UPLD_RES_FT 0x17, 0x10, 4
#define SR_AACK_FLTR_RES_FT 0x17, 0x20, 5
-#define SR_RESERVED_17_2 0x17, 0x40, 6
+#define SR_CSMA_LBT_MODE 0x17, 0x40, 6
#define SR_RESERVED_17_1 0x17, 0x80, 7
#define RG_FTN_CTRL (0x18)
#define SR_RESERVED_18_2 0x18, 0x7f, 0
@@ -786,6 +786,14 @@ at86rf212_set_txpower(struct ieee802154_dev *dev, int db)
return 0;
}
+static int
+at86rf212_set_lbt(struct ieee802154_dev *dev, bool on)
+{
+ struct at86rf230_local *lp = dev->priv;
+
+ return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
+}
+
static struct ieee802154_ops at86rf230_ops = {
.owner = THIS_MODULE,
.xmit = at86rf230_xmit,
@@ -805,6 +813,7 @@ static struct ieee802154_ops at86rf212_ops = {
.stop = at86rf230_stop,
.set_hw_addr_filt = at86rf230_set_hw_addr_filt,
.set_txpower = at86rf212_set_txpower,
+ .set_lbt = at86rf212_set_lbt,
};
static void at86rf230_irqwork(struct work_struct *work)
diff --git a/include/linux/nl802154.h b/include/linux/nl802154.h
index 625d19e..326baee 100644
--- a/include/linux/nl802154.h
+++ b/include/linux/nl802154.h
@@ -71,6 +71,7 @@ enum {
IEEE802154_ATTR_DEV_TYPE,
IEEE802154_ATTR_TXPOWER,
+ IEEE802154_ATTR_LBT_ENABLED,
__IEEE802154_ATTR_MAX,
};
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index 8bd2785..521edcb 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -117,6 +117,11 @@ struct ieee802154_dev {
* set_txpower:
* Set radio transmit power in dB. Called with pib_lock held.
* Returns either zero, or negative errno.
+ *
+ * set_lbt
+ * Enables or disables listen before talk on the device. Called with
+ * pib_lock held.
+ * Returns either zero, or negative errno.
*/
struct ieee802154_ops {
struct module *owner;
@@ -134,6 +139,7 @@ struct ieee802154_ops {
int (*ieee_addr)(struct ieee802154_dev *dev,
u8 addr[IEEE802154_ADDR_LEN]);
int (*set_txpower)(struct ieee802154_dev *dev, int db);
+ int (*set_lbt)(struct ieee802154_dev *dev, bool on);
};
/* Basic interface to register ieee802154 device */
diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h
index f06c272..e87b613 100644
--- a/include/net/wpan-phy.h
+++ b/include/net/wpan-phy.h
@@ -47,6 +47,8 @@ struct wpan_phy {
u8 transmit_power;
u8 cca_mode;
+ bool lbt;
+
struct device dev;
int idx;
@@ -55,6 +57,7 @@ struct wpan_phy {
void (*del_iface)(struct wpan_phy *phy, struct net_device *dev);
int (*set_txpower)(struct wpan_phy *phy, int db);
+ int (*set_lbt)(struct wpan_phy *phy, bool on);
char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
};
diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c
index 14bc270..d73ae97 100644
--- a/net/ieee802154/nl-phy.c
+++ b/net/ieee802154/nl-phy.c
@@ -57,7 +57,8 @@ static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32
portid,
nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel) ||
nla_put_s8(msg, IEEE802154_ATTR_TXPOWER,
- ((signed char) (phy->transmit_power << 2)) >>
2))
+ ((signed char) (phy->transmit_power << 2)) >>
2) ||
+ nla_put_u8(msg, IEEE802154_ATTR_LBT_ENABLED, phy->lbt))
goto nla_put_failure;
for (i = 0; i < 32; i++) {
if (phy->channels_supported[i])
@@ -357,45 +358,77 @@ out_dev:
return rc;
}
+static int phy_set_txpower(struct wpan_phy *phy, struct genl_info *info)
+{
+ int txpower = nla_get_s8(info->attrs[IEEE802154_ATTR_TXPOWER]);
+ int rc;
+ u8 txpower_wpan;
+
+ if (txpower < -64 || txpower > 63)
+ return -EINVAL; /* txpower code subfield is 6 bits long */
+
+ txpower_wpan = ((unsigned char) (txpower << 2)) >> 2;
+
+ rc = phy->set_txpower(phy, txpower);
+ if (rc < 0)
+ return rc;
+
+ phy->transmit_power = txpower_wpan;
+
+ return 0;
+}
+
+static int phy_set_lbt(struct wpan_phy *phy, struct genl_info *info)
+{
+ u8 on = !!nla_get_u8(info->attrs[IEEE802154_ATTR_LBT_ENABLED]);
+ int rc;
+
+ rc = phy->set_lbt(phy, on);
+ if (rc < 0)
+ return rc;
+
+ phy->lbt = on;
+
+ return 0;
+}
+
int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
{
struct wpan_phy *phy;
const char *name;
- int txpower;
- u8 txpower_wpan;
- int rc = -EINVAL;
+ int rc = -ENOTSUPP;
pr_debug("%s\n", __func__);
- if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
+ if (!info->attrs[IEEE802154_ATTR_PHY_NAME] &&
+ !info->attrs[IEEE802154_ATTR_LBT_ENABLED])
return -EINVAL;
name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
return -EINVAL; /* phy name should be null-terminated */
- txpower = nla_get_s8(info->attrs[IEEE802154_ATTR_TXPOWER]);
- if (txpower < -64 || txpower > 63)
- return -EINVAL; /* txpower code subfield is 6 bits long */
-
- txpower_wpan = ((unsigned char) (txpower << 2)) >> 2;
-
phy = wpan_phy_find(name);
if (!phy)
return -ENODEV;
- if (!phy->set_txpower)
+ if ((!phy->set_txpower && info->attrs[IEEE802154_ATTR_TXPOWER]) ||
+ (!phy->set_lbt && info->attrs[IEEE802154_ATTR_LBT_ENABLED]))
goto out;
mutex_lock(&phy->pib_lock);
- rc = phy->set_txpower(phy, txpower);
- if (rc < 0) {
- mutex_unlock(&phy->pib_lock);
- goto out;
+ if (info->attrs[IEEE802154_ATTR_TXPOWER]) {
+ rc = phy_set_txpower(phy, info);
+ if (rc < 0)
+ goto error;
}
- phy->transmit_power = txpower_wpan;
+ if (info->attrs[IEEE802154_ATTR_LBT_ENABLED]) {
+ rc = phy_set_lbt(phy, info);
+ if (rc < 0)
+ goto error;
+ }
mutex_unlock(&phy->pib_lock);
@@ -403,6 +436,8 @@ int ieee802154_set_phyparams(struct sk_buff *skb, struct
genl_info *info)
return 0;
+error:
+ mutex_unlock(&phy->pib_lock);
out:
wpan_phy_put(phy);
return rc;
diff --git a/net/ieee802154/nl_policy.c b/net/ieee802154/nl_policy.c
index 90b1d0d..a09f642 100644
--- a/net/ieee802154/nl_policy.c
+++ b/net/ieee802154/nl_policy.c
@@ -54,5 +54,6 @@ const struct nla_policy ieee802154_policy[IEEE802154_ATTR_MAX
+ 1] = {
[IEEE802154_ATTR_CHANNEL_PAGE_LIST] = { .len = 32 * 4, },
[IEEE802154_ATTR_TXPOWER] = { .type = NLA_S8, },
+ [IEEE802154_ATTR_LBT_ENABLED] = { .type = NLA_U8, },
};
diff --git a/net/mac802154/ieee802154_dev.c b/net/mac802154/ieee802154_dev.c
index 9eb49e0..56338c8 100644
--- a/net/mac802154/ieee802154_dev.c
+++ b/net/mac802154/ieee802154_dev.c
@@ -175,6 +175,16 @@ static int mac802154_set_txpower(struct wpan_phy *phy, int
db)
return priv->ops->set_txpower(&priv->hw, db);
}
+static int mac802154_set_lbt(struct wpan_phy *phy, bool on)
+{
+ struct mac802154_priv *priv = wpan_phy_priv(phy);
+
+ if (!priv->ops->set_lbt)
+ return -ENOTSUPP;
+
+ return priv->ops->set_lbt(&priv->hw, on);
+}
+
struct ieee802154_dev *
ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
{
@@ -253,6 +263,7 @@ int ieee802154_register_device(struct ieee802154_dev *dev)
priv->phy->add_iface = mac802154_add_iface;
priv->phy->del_iface = mac802154_del_iface;
priv->phy->set_txpower = mac802154_set_txpower;
+ priv->phy->set_lbt = mac802154_set_lbt;
rc = wpan_phy_register(priv->phy);
if (rc < 0)
--
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