ath10k: implement set_base_macaddr to fix rx-bssid mask in multiple APs conf

Many integrated QCA9984 WiFis in various IPQ806x platform routers
from various vendors (Netgear R7800, ZyXEL NBG6817, TP-LINK C2600,
etc.) have either blank, bogus or non-unique MAC-addresses in
their calibration data.

As a result, OpenWrt utilizes a discouraged binary calibration data
patching method that allows to modify the device's MAC-addresses right
at the source. This is because the ath10k' firmware extracts the MAC
address from the supplied radio/calibration data and issues a response
to the ath10k linux driver. Which was designed to take the main MAC in
ath10k_wmi_event_ready().

Part of the "setting an alternate MAC" issue was already tackled by a
patch from Brian Norris:
commit 9d580466
("ath10k: retrieve MAC address from system firmware if provided")
by allowing the option to specify an alternate MAC-address with the
established device_get_mac_address() function which extracts the right
address from DeviceTree/fwnode mac-address or local-mac-address
properties and saves it for later.

However, Ben Greear noted that the Qualcomm's ath10k firmware is liable
to not properly calculate its rx-bssid mask in this case. This can cause
issues in the popluar "multiple AP with a single ath10k instance"
configurations.

To improve MAC address handling, Felix Fietkau suggested to call
pdev_set_base_macaddr_cmdid before bringing up the first vif and
use the first vif MAC address there. Which is in ath10k_core_start().

This patch implement Felix Fietkau's request to
"call pdev_set_base_macaddr_cmdid before bringing up the first vif".
The pdev_set_base_macaddr_cmdid is already declared for all devices
and version. The driver just needed the support code for this
function.

Tested on:
QCA9880/CUS223, firmwares: 10.2.4.13-2, 10.2.4.70.44, 10.2.4-1.0-00041
QCA9887/MR33 firmware:10.2.4-1.0-00033
QCA4019/RT-AC58U firmware: 10.4-3.4-00104, 10.4-3.5.3-00057
QCA9984/R7800 firmware: Candela Technologies (CT) Firmware

BugLink: https://lists.openwrt.org/pipermail/openwrt-devel/2018-November/014595.html
Fixes: 9d580466 ("ath10k: retrieve MAC address from system firmware if provided")
Cc: Brian Norris <briannorris@chromium.org>
Cc: Ben Greear <greearb@candelatech.com>
Cc: Felix Fietkau <nbd@nbd.name>
Cc: Mathias Kresin <dev@kresin.me>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath10k/core.c

@@ -2659,6 +2659,13 @@ int ath10k_core_start(struct ath10k *ar, enum ath10k_firmware_mode mode,
 		goto err_hif_stop;
 	}
 
+	status = ath10k_wmi_pdev_set_base_macaddr(ar, ar->mac_addr);
+	if (status && status != -EOPNOTSUPP) {
+		ath10k_err(ar,
+			   "failed to set base mac address: %d\n", status);
+		goto err_hif_stop;
+	}
+
 	/* Some firmware revisions do not properly set up hardware rx filter
 	 * registers.
 	 *

drivers/net/wireless/ath/ath10k/wmi-ops.h

@@ -69,6 +69,8 @@ struct wmi_ops {
 
 	struct sk_buff *(*gen_pdev_suspend)(struct ath10k *ar, u32 suspend_opt);
 	struct sk_buff *(*gen_pdev_resume)(struct ath10k *ar);
+	struct sk_buff *(*gen_pdev_set_base_macaddr)(struct ath10k *ar,
+						     const u8 macaddr[ETH_ALEN]);
 	struct sk_buff *(*gen_pdev_set_rd)(struct ath10k *ar, u16 rd, u16 rd2g,
 					   u16 rd5g, u16 ctl2g, u16 ctl5g,
 					   enum wmi_dfs_region dfs_reg);
@@ -519,6 +521,22 @@ ath10k_wmi_pdev_set_regdomain(struct ath10k *ar, u16 rd, u16 rd2g, u16 rd5g,
 				   ar->wmi.cmd->pdev_set_regdomain_cmdid);
 }
 
+static inline int
+ath10k_wmi_pdev_set_base_macaddr(struct ath10k *ar, const u8 macaddr[ETH_ALEN])
+{
+	struct sk_buff *skb;
+
+	if (!ar->wmi.ops->gen_pdev_set_base_macaddr)
+		return -EOPNOTSUPP;
+
+	skb = ar->wmi.ops->gen_pdev_set_base_macaddr(ar, macaddr);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	return ath10k_wmi_cmd_send(ar, skb,
+				   ar->wmi.cmd->pdev_set_base_macaddr_cmdid);
+}
+
 static inline int
 ath10k_wmi_pdev_suspend_target(struct ath10k *ar, u32 suspend_opt)
 {

drivers/net/wireless/ath/ath10k/wmi.c

@@ -6286,6 +6286,25 @@ int ath10k_wmi_connect(struct ath10k *ar)
 	return 0;
 }
 
+static struct sk_buff *
+ath10k_wmi_op_gen_pdev_set_base_macaddr(struct ath10k *ar,
+					const u8 macaddr[ETH_ALEN])
+{
+	struct wmi_pdev_set_base_macaddr_cmd *cmd;
+	struct sk_buff *skb;
+
+	skb = ath10k_wmi_alloc_skb(ar, sizeof(*cmd));
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	cmd = (struct wmi_pdev_set_base_macaddr_cmd *)skb->data;
+	ether_addr_copy(cmd->mac_addr.addr, macaddr);
+
+	ath10k_dbg(ar, ATH10K_DBG_WMI,
+		   "wmi pdev basemac %pM\n", macaddr);
+	return skb;
+}
+
 static struct sk_buff *
 ath10k_wmi_op_gen_pdev_set_rd(struct ath10k *ar, u16 rd, u16 rd2g, u16 rd5g,
 			      u16 ctl2g, u16 ctl5g,
@@ -9095,6 +9114,7 @@ static const struct wmi_ops wmi_10_2_ops = {
 	.gen_peer_create = ath10k_wmi_op_gen_peer_create,
 	.gen_peer_delete = ath10k_wmi_op_gen_peer_delete,
 	.gen_peer_flush = ath10k_wmi_op_gen_peer_flush,
+	.gen_pdev_set_base_macaddr = ath10k_wmi_op_gen_pdev_set_base_macaddr,
 	.gen_peer_set_param = ath10k_wmi_op_gen_peer_set_param,
 	.gen_set_psmode = ath10k_wmi_op_gen_set_psmode,
 	.gen_set_sta_ps = ath10k_wmi_op_gen_set_sta_ps,
@@ -9213,6 +9233,7 @@ static const struct wmi_ops wmi_10_4_ops = {
 
 	.gen_pdev_suspend = ath10k_wmi_op_gen_pdev_suspend,
 	.gen_pdev_resume = ath10k_wmi_op_gen_pdev_resume,
+	.gen_pdev_set_base_macaddr = ath10k_wmi_op_gen_pdev_set_base_macaddr,
 	.gen_pdev_set_rd = ath10k_wmi_10x_op_gen_pdev_set_rd,
 	.gen_pdev_set_param = ath10k_wmi_op_gen_pdev_set_param,
 	.gen_init = ath10k_wmi_10_4_op_gen_init,

drivers/net/wireless/ath/ath10k/wmi.h

@@ -4085,6 +4085,10 @@ struct wmi_pdev_set_param_cmd {
 	__le32 param_value;
 } __packed;
 
+struct wmi_pdev_set_base_macaddr_cmd {
+	struct wmi_mac_addr mac_addr;
+} __packed;
+
 /* valid period is 1 ~ 60000ms, unit in millisecond */
 #define WMI_PDEV_PARAM_CAL_PERIOD_MAX 60000