ath9k: Add data structure for supporting virtual radio/wiphy operation

This is the initial step in allowing ath9k to register multiple
virtual radios (wiphys). The goal of virtual radios is to allow the
same radio to be shared for multiple virtual interfaces that may
operate on different channels. The mac80211 virtual interface support
is designed only for single channel operation and as such, it is not
suitable for this type of use. Anyway, it can be used on top of the
virtual radio concept, if desired (e.g., use two virtual radios to
handle two channels and then add multiple mac80211 virtual interfaces
on top of each virtual radio).

The new struct ath_wiphy is now registered as the driver data
structure for wiphy. This structure has a pointer to the shared (among
virtual wiphys of the same physical radio) struct ath_softc data. The
primary wiphy maintains the allocated memory for ath_softc. Secondary
(virtual) wiphys will only allocate the new ath_wiphy structure.

Registration of secondary wiphys is added in a separate patch.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 14 insertions, 5 deletions

diff --git a/drivers/net/wireless/ath9k/pci.c b/drivers/net/wireless/ath9k/pci.c
index eea9d3a9d43c..9a58baabb9ca 100644
--- a/drivers/net/wireless/ath9k/pci.c
+++ b/drivers/net/wireless/ath9k/pci.c
@@ -83,6 +83,7 @@ static struct ath_bus_ops ath_pci_bus_ops = {
 static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	void __iomem *mem;
+	struct ath_wiphy *aphy;
 	struct ath_softc *sc;
 	struct ieee80211_hw *hw;
 	u8 csz;
@@ -155,7 +156,8 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto bad1;
 	}
 
-	hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
+	hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy) +
+				sizeof(struct ath_softc), &ath9k_ops);
 	if (hw == NULL) {
 		printk(KERN_ERR "ath_pci: no memory for ieee80211_hw\n");
 		goto bad2;
@@ -164,7 +166,11 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	SET_IEEE80211_DEV(hw, &pdev->dev);
 	pci_set_drvdata(pdev, hw);
 
-	sc = hw->priv;
+	aphy = hw->priv;
+	sc = (struct ath_softc *) (aphy + 1);
+	aphy->sc = sc;
+	aphy->hw = hw;
+	sc->pri_wiphy = aphy;
 	sc->hw = hw;
 	sc->dev = &pdev->dev;
 	sc->mem = mem;
@@ -214,7 +220,8 @@ bad:
 static void ath_pci_remove(struct pci_dev *pdev)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
-	struct ath_softc *sc = hw->priv;
+	struct ath_wiphy *aphy = hw->priv;
+	struct ath_softc *sc = aphy->sc;
 
 	ath_cleanup(sc);
 }
@@ -224,7 +231,8 @@ static void ath_pci_remove(struct pci_dev *pdev)
 static int ath_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
-	struct ath_softc *sc = hw->priv;
+	struct ath_wiphy *aphy = hw->priv;
+	struct ath_softc *sc = aphy->sc;
 
 	ath9k_hw_set_gpio(sc->sc_ah, ATH_LED_PIN, 1);
 
@@ -243,7 +251,8 @@ static int ath_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 static int ath_pci_resume(struct pci_dev *pdev)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
-	struct ath_softc *sc = hw->priv;
+	struct ath_wiphy *aphy = hw->priv;
+	struct ath_softc *sc = aphy->sc;
 	u32 val;
 	int err;