Some Marvell AP firmware used with mwl8k misbehaves when beacon frames
do not contain a WLAN_EID_DS_PARAMS element with the current channel.
It was reported on OpenWrt Github issues [0].

When hostapd/mac80211 omits DSSS Parameter Set from the beacon (which is
valid on some bands), the firmware stops transmitting sane frames and RX
status starts reporting bogus channel information. This makes AP mode
unusable.

Newer Marvell drivers (mwlwifi [1]) hard-code DSSS Parameter Set into
AP beacons for all chips, which suggests this is a firmware requirement
rather than a mwl8k-specific quirk.

Mirror that behaviour in mwl8k: when setting the beacon, check if
WLAN_EID_DS_PARAMS is present, and if not, extend the beacon and inject
a DSSS Parameter Set element, using the current channel from
hw->conf.chandef.chan.

Tested on Linksys EA4500 (88W8366).

[0] https://github.com/openwrt/openwrt/issues/19088
[1] https://github.com/kaloz/mwlwifi/blob/db97edf20fadea2617805006f5230665fadc6a8c/hif/fwcmd.c#L675

Fixes: b64fe619e371 ("mwl8k: basic AP interface support")
Tested-by: Antony Kolitsos <zeusomighty@hotmail.com>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>

---
V2:
  - added "wifi:" prefix to commit title
  - renamed "DS Params" -> "DSSS Parameter Set"
  - Insert WLAN_EID_DS_PARAMS after WLAN_EID_SSID, WLAN_EID_SUPP_RATES
    and WLAN_EID_EXT_SUPP_RATES
V3:
  - Insert WLAN_EID_DS_PARAMS after WLAN_EID_SSID and WLAN_EID_SUPP_RATES
    only
  - Style issues fixes
V4:
  - Style issues fixes
  - Added "Fixes"
---
 drivers/net/wireless/marvell/mwl8k.c | 71 ++++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwl8k.c b/drivers/net/wireless/marvell/mwl8k.c
index 891e125ad30b..54d6d00ecdf1 100644
--- a/drivers/net/wireless/marvell/mwl8k.c
+++ b/drivers/net/wireless/marvell/mwl8k.c
@@ -2966,6 +2966,51 @@ mwl8k_cmd_rf_antenna(struct ieee80211_hw *hw, int antenna, int mask)
 /*
  * CMD_SET_BEACON.
  */
+
+static bool mwl8k_beacon_has_ds_params(const u8 *buf, int len)
+{
+	const struct ieee80211_mgmt *mgmt = (const void *)buf;
+	int ies_len;
+
+	if (len <= offsetof(struct ieee80211_mgmt, u.beacon.variable))
+		return false;
+
+	ies_len = len - offsetof(struct ieee80211_mgmt, u.beacon.variable);
+
+	return cfg80211_find_ie(WLAN_EID_DS_PARAMS, mgmt->u.beacon.variable,
+				ies_len) != NULL;
+}
+
+static void mwl8k_beacon_copy_inject_ds_params(struct ieee80211_hw *hw,
+					       u8 *buf_dst, const u8 *buf_src,
+					       int src_len)
+{
+	const struct ieee80211_mgmt *mgmt = (const void *)buf_src;
+	static const u8 before_ds_params[] = {
+		WLAN_EID_SSID,
+		WLAN_EID_SUPP_RATES,
+	};
+	const u8 *ies;
+	int hdr_len, left, offs, pos;
+
+	ies = mgmt->u.beacon.variable;
+	hdr_len = offsetof(struct ieee80211_mgmt, u.beacon.variable);
+
+	offs = ieee80211_ie_split(ies, src_len - hdr_len, before_ds_params,
+				  ARRAY_SIZE(before_ds_params), 0);
+
+	pos = hdr_len + offs;
+	left = src_len - pos;
+
+	memcpy(buf_dst, buf_src, pos);
+
+	/* Inject a DSSS Parameter Set after SSID + Supp Rates */
+	buf_dst[pos + 0] = WLAN_EID_DS_PARAMS;
+	buf_dst[pos + 1] = 1;
+	buf_dst[pos + 2] = hw->conf.chandef.chan->hw_value;
+
+	memcpy(buf_dst + pos + 3, buf_src + pos, left);
+}
 struct mwl8k_cmd_set_beacon {
 	struct mwl8k_cmd_pkt_hdr header;
 	__le16 beacon_len;
@@ -2975,17 +3020,33 @@ struct mwl8k_cmd_set_beacon {
 static int mwl8k_cmd_set_beacon(struct ieee80211_hw *hw,
 				struct ieee80211_vif *vif, u8 *beacon, int len)
 {
+	bool ds_params_present = mwl8k_beacon_has_ds_params(beacon, len);
 	struct mwl8k_cmd_set_beacon *cmd;
-	int rc;
+	int rc, final_len = len;
 
-	cmd = kzalloc(sizeof(*cmd) + len, GFP_KERNEL);
+	if (!ds_params_present) {
+		/*
+		 * mwl8k firmware requires a DS Params IE with the current
+		 * channel in AP beacons. If mac80211/hostapd does not
+		 * include it, inject one here. IE ID + length + channel
+		 * number = 3 bytes.
+		 */
+		final_len += 3;
+	}
+
+	cmd = kzalloc(sizeof(*cmd) + final_len, GFP_KERNEL);
 	if (cmd == NULL)
 		return -ENOMEM;
 
 	cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_BEACON);
-	cmd->header.length = cpu_to_le16(sizeof(*cmd) + len);
-	cmd->beacon_len = cpu_to_le16(len);
-	memcpy(cmd->beacon, beacon, len);
+	cmd->header.length = cpu_to_le16(sizeof(*cmd) + final_len);
+	cmd->beacon_len = cpu_to_le16(final_len);
+
+	if (ds_params_present)
+		memcpy(cmd->beacon, beacon, len);
+	else
+		mwl8k_beacon_copy_inject_ds_params(hw, cmd->beacon, beacon,
+						   len);
 
 	rc = mwl8k_post_pervif_cmd(hw, vif, &cmd->header);
 	kfree(cmd);
-- 
2.34.1