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authorMiquel Raynal <miquel.raynal@bootlin.com>2022-02-01 21:06:28 +0300
committerStefan Schmidt <stefan@datenfreihafen.org>2022-02-10 17:41:58 +0300
commit781830c800ddd19566846c634de09fadf37eafde (patch)
treeda035c54ff57637f594223944ddd6d81394cfb39 /net/mac802154
parent731cddce6dd110fb2cdee34eddb48599e7251517 (diff)
downloadlinux-781830c800ddd19566846c634de09fadf37eafde.tar.xz
net: mac802154: Set durations automatically
As depicted in the IEEE 802.15.4 specification, modulation/bands are tight to a number of page/channels so we can for most of them derive the durations automatically. The two locations that must call this new helper to set the variou symbol durations are: - when manually requesting a channel change though the netlink interface - at PHY creation, once the device driver has set the default page/channel If an information is missing, the symbol duration is not touched, a debug message is eventually printed. This keeps the compatibility with the unconverted drivers for which it was too complicated for me to find their precise information. If they initially provided a symbol duration, it would be kept. If they don't, the symbol duration value is left untouched. Once the symbol duration derived, the lifs and sifs durations are updated as well. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Alexander Aring <aahringo@redhat.com> Link: https://lore.kernel.org/r/20220201180629.93410-4-miquel.raynal@bootlin.com Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Diffstat (limited to 'net/mac802154')
-rw-r--r--net/mac802154/cfg.c1
-rw-r--r--net/mac802154/main.c46
2 files changed, 47 insertions, 0 deletions
diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c
index fbeebe3bc31d..1e4a9f74ed43 100644
--- a/net/mac802154/cfg.c
+++ b/net/mac802154/cfg.c
@@ -118,6 +118,7 @@ ieee802154_set_channel(struct wpan_phy *wpan_phy, u8 page, u8 channel)
if (!ret) {
wpan_phy->current_page = page;
wpan_phy->current_channel = channel;
+ ieee802154_configure_durations(wpan_phy);
}
return ret;
diff --git a/net/mac802154/main.c b/net/mac802154/main.c
index 53153367f9d0..5546ef86e231 100644
--- a/net/mac802154/main.c
+++ b/net/mac802154/main.c
@@ -113,6 +113,50 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
}
EXPORT_SYMBOL(ieee802154_alloc_hw);
+void ieee802154_configure_durations(struct wpan_phy *phy)
+{
+ u32 duration = 0;
+
+ switch (phy->current_page) {
+ case 0:
+ if (BIT(phy->current_page) & 0x1)
+ /* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
+ duration = 50 * NSEC_PER_USEC;
+ else if (phy->current_page & 0x7FE)
+ /* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */
+ duration = 25 * NSEC_PER_USEC;
+ else if (phy->current_page & 0x7FFF800)
+ /* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
+ duration = 16 * NSEC_PER_USEC;
+ break;
+ case 2:
+ if (BIT(phy->current_page) & 0x1)
+ /* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
+ duration = 40 * NSEC_PER_USEC;
+ else if (phy->current_page & 0x7FE)
+ /* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
+ duration = 16 * NSEC_PER_USEC;
+ break;
+ case 3:
+ if (BIT(phy->current_page) & 0x3FFF)
+ /* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
+ duration = 6 * NSEC_PER_USEC;
+ break;
+ default:
+ break;
+ }
+
+ if (!duration) {
+ pr_debug("Unknown PHY symbol duration\n");
+ return;
+ }
+
+ phy->symbol_duration = duration;
+ phy->lifs_period = (IEEE802154_LIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
+ phy->sifs_period = (IEEE802154_SIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
+}
+EXPORT_SYMBOL(ieee802154_configure_durations);
+
void ieee802154_free_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = hw_to_local(hw);
@@ -157,6 +201,8 @@ int ieee802154_register_hw(struct ieee802154_hw *hw)
ieee802154_setup_wpan_phy_pib(local->phy);
+ ieee802154_configure_durations(local->phy);
+
if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
local->phy->supported.min_csma_backoffs = 4;
local->phy->supported.max_csma_backoffs = 4;