wifi: ath11k: provide address list if chip supports 2 stations

Provide address list to mac80211 so user doesn't need to specify addresses when
a second interface is added because the address can be allocated from the list
by mac80211.

The derived addresses have LAA (Local Administered Address) bit set, and only
the first byte is changed. Take the 00:03:7f:xx:xx:xx as example to derive:

addresses[0] is unchanged, it's still 00:03:7f:xx:xx:xx,
addresses[1] is 02:03:7f:xx:xx:xx,
addresses[2] is 12:03:7f:xx:xx:xx,
addresses[3] is 22:03:7f:xx:xx:xx,
addresses[4] is 32:03:7f:xx:xx:xx.

However as only 3 addresses are reported now, so addresses[3] and addresses[4]
aren't actually derived.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3

Signed-off-by: Carl Huang <quic_cjhuang@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20230714023801.2621802-3-quic_cjhuang@quicinc.com

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 7180ce9dbf98..7f18a6a68b81 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -9824,6 +9824,33 @@ static int ath11k_mac_setup_channels_rates(struct ath11k *ar,
 	return 0;
 }
 
+static void ath11k_mac_setup_mac_address_list(struct ath11k *ar)
+{
+	struct mac_address *addresses;
+	u16 n_addresses;
+	int i;
+
+	if (!ar->ab->hw_params.support_dual_stations)
+		return;
+
+	n_addresses = ar->ab->hw_params.num_vdevs;
+	addresses = kcalloc(n_addresses, sizeof(*addresses), GFP_KERNEL);
+	if (!addresses)
+		return;
+
+	memcpy(addresses[0].addr, ar->mac_addr, ETH_ALEN);
+	for (i = 1; i < n_addresses; i++) {
+		memcpy(addresses[i].addr, ar->mac_addr, ETH_ALEN);
+		/* set Local Administered Address bit */
+		addresses[i].addr[0] |= 0x2;
+
+		addresses[i].addr[0] += (i - 1) << 4;
+	}
+
+	ar->hw->wiphy->addresses = addresses;
+	ar->hw->wiphy->n_addresses = n_addresses;
+}
+
 static int ath11k_mac_setup_iface_combinations(struct ath11k *ar)
 {
 	struct ath11k_base *ab = ar->ab;
@@ -9947,6 +9974,8 @@ static void __ath11k_mac_unregister(struct ath11k *ar)
 	kfree(ar->hw->wiphy->iface_combinations[0].limits);
 	kfree(ar->hw->wiphy->iface_combinations);
 
+	kfree(ar->hw->wiphy->addresses);
+
 	SET_IEEE80211_DEV(ar->hw, NULL);
 }
 
@@ -9989,6 +10018,7 @@ static int __ath11k_mac_register(struct ath11k *ar)
 	ath11k_pdev_caps_update(ar);
 
 	SET_IEEE80211_PERM_ADDR(ar->hw, ar->mac_addr);
+	ath11k_mac_setup_mac_address_list(ar);
 
 	SET_IEEE80211_DEV(ar->hw, ab->dev);