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 | 17 +++++++++- include/linux/nl802154.h | 1 + include/net/mac802154.h | 7 ++++- include/net/wpan-phy.h | 3 ++ net/ieee802154/nl-phy.c | 61 +++++++++++++++++++++++++++--------- net/ieee802154/nl_policy.c | 1 + net/mac802154/ieee802154_dev.c | 8 +++++ 7 files changed, 81 insertions(+), 17 deletions(-) diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c index 10a4647..319b0e6 100644 --- a/drivers/net/ieee802154/at86rf230.c +++ b/drivers/net/ieee802154/at86rf230.c @@ -153,7 +153,7 @@ 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 @@ -720,6 +720,20 @@ at86rf230_set_txpower(struct ieee802154_dev *dev, int db) return 0; } +static int +at86rf230_set_lbt(struct ieee802154_dev *dev, u8 on) +{ + struct at86rf230_local *lp = dev->priv; + int rc; + + if (!is_rf212(lp)) + return -ENOTSUPP; + + rc = at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on); + + return rc; +} + static struct ieee802154_ops at86rf230_ops = { .owner = THIS_MODULE, .xmit = at86rf230_xmit, @@ -729,6 +743,7 @@ static struct ieee802154_ops at86rf230_ops = { .stop = at86rf230_stop, .set_hw_addr_filt = at86rf230_set_hw_addr_filt, .set_txpower = at86rf230_set_txpower, + .set_lbt = at86rf230_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 334950f..c0bfdd4 100644 --- a/include/net/mac802154.h +++ b/include/net/mac802154.h @@ -116,7 +116,11 @@ struct ieee802154_dev { * * set_txpower: * Set radio transmit power in dB. - * Returns either zero, er negative errno. + * Returns either zero, or negative errno. + * + * set_lbt + * Enables or disables listen before talk on the device. + * Returns either zero, or negative errno. */ struct ieee802154_ops { struct module *owner; @@ -134,6 +138,7 @@ 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, u8 on); }; /* Basic interface to register ieee802154 device */ diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h index 44e5e49..30cdae6 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; + u8 lbt:1; + 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 txpower); + int (*set_lbt)(struct wpan_phy *phy, u8 on); char priv[0] __attribute__((__aligned__(NETDEV_ALIGN))); }; diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c index 3ade8c6..cda6e0d 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_s32(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]) @@ -357,41 +358,71 @@ out_dev: return rc; } +static int phy_set_txpower(struct wpan_phy *phy, struct genl_info *info) +{ + int txpower = nla_get_s32(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_s32(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; - rc = phy->set_txpower(phy, txpower); - if (rc < 0) + if (info->attrs[IEEE802154_ATTR_TXPOWER] && + (rc = phy_set_txpower(phy, info)) < 0) goto out; - phy->transmit_power = txpower_wpan; + if (info->attrs[IEEE802154_ATTR_LBT_ENABLED] && + (rc = phy_set_lbt(phy, info)) < 0) + goto out; wpan_phy_put(phy); diff --git a/net/ieee802154/nl_policy.c b/net/ieee802154/nl_policy.c index 4035333..ab88033 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_S32, }, + [IEEE802154_ATTR_LBT_ENABLED] = { .type = NLA_U8, }, }; diff --git a/net/mac802154/ieee802154_dev.c b/net/mac802154/ieee802154_dev.c index febf2ab..762a452 100644 --- a/net/mac802154/ieee802154_dev.c +++ b/net/mac802154/ieee802154_dev.c @@ -172,6 +172,13 @@ static int mac802154_set_txpower(struct wpan_phy *phy, int txpower) return priv->ops->set_txpower(&priv->hw, txpower); } +static int mac802154_set_lbt(struct wpan_phy *phy, u8 on) +{ + struct mac802154_priv *priv = wpan_phy_priv(phy); + + return priv->ops->set_lbt(&priv->hw, on); +} + struct ieee802154_dev * ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops) { @@ -250,6 +257,7 @@ 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) -- 1.7.9.5 ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. 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