wifi: rtw89: Add extra TX headroom for USB

JIRA: https://issues.redhat.com/browse/RHEL-114889

commit ec542d5
Author: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Date:   Mon Jun 30 23:44:28 2025 +0300

    wifi: rtw89: Add extra TX headroom for USB
    
    In the case of USB the TX descriptor is transmitted in the same buffer
    as the 802.11 frame, so add the required headroom.
    
    Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
    Acked-by: Ping-Ke Shih <pkshih@realtek.com>
    Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
    Link: https://patch.msgid.link/91fb7579-60e5-4a06-8007-3312639beea6@gmail.com

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Author: jtornosm

drivers/net/wireless/realtek/rtw89/core.c

@@ -5591,6 +5591,9 @@ static int rtw89_core_register_hw(struct rtw89_dev *rtwdev)
 	int ret;
 	int tx_headroom = IEEE80211_HT_CTL_LEN;
 
+	if (rtwdev->hci.type == RTW89_HCI_TYPE_USB)
+		tx_headroom += chip->txwd_body_size + chip->txwd_info_size;
+
 	hw->vif_data_size = struct_size_t(struct rtw89_vif, links_inst, n);
 	hw->sta_data_size = struct_size_t(struct rtw89_sta, links_inst, n);
 	hw->txq_data_size = sizeof(struct rtw89_txq);