mac802154: Prepare forcing specific symbol duration

The scan logic will bypass the whole ->set_channel() logic from the top
by calling the driver hook to just switch between channels when
required.

We can no longer rely on the "current" page/channel settings to set the
right symbol duration. Let's add these as new parameters to allow
providing the page/channel couple that we want.

There is no functional change.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230103165644.432209-5-miquel.raynal@bootlin.comSigned-off-by: Stefan Schmidt <stefan@datenfreihafen.org>

include/net/cfg802154.h

@@ -483,6 +483,7 @@ static inline const char *wpan_phy_name(struct wpan_phy *phy)
 	return dev_name(&phy->dev);
 }
 
-void ieee802154_configure_durations(struct wpan_phy *phy);
+void ieee802154_configure_durations(struct wpan_phy *phy,
+				    unsigned int page, unsigned int channel);
 
 #endif /* __NET_CFG802154_H */

net/mac802154/cfg.c

@@ -118,7 +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);
+		ieee802154_configure_durations(wpan_phy, page, channel);
 	}
 
 	return ret;

net/mac802154/main.c

@@ -113,32 +113,33 @@ 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)
+void ieee802154_configure_durations(struct wpan_phy *phy,
+				    unsigned int page, unsigned int channel)
 {
 	u32 duration = 0;
 
-	switch (phy->current_page) {
+	switch (page) {
 	case 0:
-		if (BIT(phy->current_channel) & 0x1)
+		if (BIT(channel) & 0x1)
 			/* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
 			duration = 50 * NSEC_PER_USEC;
-		else if (BIT(phy->current_channel) & 0x7FE)
+		else if (BIT(channel) & 0x7FE)
 			/* 915 MHz BPSK	802.15.4-2003: 40 ksym/s */
 			duration = 25 * NSEC_PER_USEC;
-		else if (BIT(phy->current_channel) & 0x7FFF800)
+		else if (BIT(channel) & 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_channel) & 0x1)
+		if (BIT(channel) & 0x1)
 			/* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
 			duration = 40 * NSEC_PER_USEC;
-		else if (BIT(phy->current_channel) & 0x7FE)
+		else if (BIT(channel) & 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_channel) & 0x3FFF)
+		if (BIT(channel) & 0x3FFF)
 			/* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
 			duration = 6 * NSEC_PER_USEC;
 		break;
@@ -201,7 +202,8 @@ int ieee802154_register_hw(struct ieee802154_hw *hw)
 
 	ieee802154_setup_wpan_phy_pib(local->phy);
 
-	ieee802154_configure_durations(local->phy);
+	ieee802154_configure_durations(local->phy, local->phy->current_page,
+				       local->phy->current_channel);
 
 	if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
 		local->phy->supported.min_csma_backoffs = 4;