1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 * Copyright(c) 2019-2020 Realtek Corporation 3 */ 4 #ifndef __RTW89_UTIL_H__ 5 #define __RTW89_UTIL_H__ 6 7 #include "core.h" 8 9 #define rtw89_iterate_vifs_bh(rtwdev, iterator, data) \ 10 ieee80211_iterate_active_interfaces_atomic((rtwdev)->hw, \ 11 IEEE80211_IFACE_ITER_NORMAL, iterator, data) 12 13 /* call this function with rtwdev->mutex is held */ 14 #define rtw89_for_each_rtwvif(rtwdev, rtwvif) \ 15 list_for_each_entry(rtwvif, &(rtwdev)->rtwvifs_list, list) 16 17 /* Before adding rtwvif to list, we need to check if it already exist, beacase 18 * in some case such as SER L2 happen during WoWLAN flow, calling reconfig 19 * twice cause the list to be added twice. 20 */ 21 static inline bool rtw89_rtwvif_in_list(struct rtw89_dev *rtwdev, 22 struct rtw89_vif *new) 23 { 24 struct rtw89_vif *rtwvif; 25 26 lockdep_assert_held(&rtwdev->mutex); 27 28 rtw89_for_each_rtwvif(rtwdev, rtwvif) 29 if (rtwvif == new) 30 return true; 31 32 return false; 33 } 34 35 /* The result of negative dividend and positive divisor is undefined, but it 36 * should be one case of round-down or round-up. So, make it round-down if the 37 * result is round-up. 38 * Note: the maximum value of divisor is 0x7FFF_FFFF, because we cast it to 39 * signed value to make compiler to use signed divide instruction. 40 */ 41 static inline s32 s32_div_u32_round_down(s32 dividend, u32 divisor, s32 *remainder) 42 { 43 s32 i_divisor = (s32)divisor; 44 s32 i_remainder; 45 s32 quotient; 46 47 quotient = dividend / i_divisor; 48 i_remainder = dividend % i_divisor; 49 50 if (i_remainder < 0) { 51 quotient--; 52 i_remainder += i_divisor; 53 } 54 55 if (remainder) 56 *remainder = i_remainder; 57 return quotient; 58 } 59 60 static inline s32 s32_div_u32_round_closest(s32 dividend, u32 divisor) 61 { 62 return s32_div_u32_round_down(dividend + divisor / 2, divisor, NULL); 63 } 64 65 static inline void ether_addr_copy_mask(u8 *dst, const u8 *src, u8 mask) 66 { 67 int i; 68 69 eth_zero_addr(dst); 70 for (i = 0; i < ETH_ALEN; i++) { 71 if (mask & BIT(i)) 72 dst[i] = src[i]; 73 } 74 } 75 76 #endif 77