drivers/net/wireless/broadcom/brcm80211/include/brcmu_utils.h

   1 // SPDX-License-Identifier: ISC
   2 /*
   3  * Copyright (c) 2010 Broadcom Corporation
   4  */
   5
   6 #ifndef _BRCMU_UTILS_H_
   7 #define _BRCMU_UTILS_H_
   8
   9 #include <linux/skbuff.h>
  10
  11 /*
  12  * Spin at most 'us' microseconds while 'exp' is true.
  13  * Caller should explicitly test 'exp' when this completes
  14  * and take appropriate error action if 'exp' is still true.
  15  */
  16 #define SPINWAIT(exp, us) { \
  17         uint countdown = (us) + 9; \
  18         while ((exp) && (countdown >= 10)) {\
  19                 udelay(10); \
  20                 countdown -= 10; \
  21         } \
  22 }
  23
  24 /* osl multi-precedence packet queue */
  25 #define PKTQ_LEN_DEFAULT        128     /* Max 128 packets */
  26 #define PKTQ_MAX_PREC           16      /* Maximum precedence levels */
  27
  28 #define BCME_STRLEN             64      /* Max string length for BCM errors */
  29
  30 /* the largest reasonable packet buffer driver uses for ethernet MTU in bytes */
  31 #define PKTBUFSZ        2048
  32
  33 #ifndef setbit
  34 #ifndef NBBY                    /* the BSD family defines NBBY */
  35 #define NBBY    8               /* 8 bits per byte */
  36 #endif                          /* #ifndef NBBY */
  37 #define setbit(a, i)    (((u8 *)a)[(i)/NBBY] |= 1<<((i)%NBBY))
  38 #define clrbit(a, i)    (((u8 *)a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
  39 #define isset(a, i)     (((const u8 *)a)[(i)/NBBY] & (1<<((i)%NBBY)))
  40 #define isclr(a, i)     ((((const u8 *)a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
  41 #endif                          /* setbit */
  42
  43 #define NBITS(type)     (sizeof(type) * 8)
  44 #define NBITVAL(nbits)  (1 << (nbits))
  45 #define MAXBITVAL(nbits)        ((1 << (nbits)) - 1)
  46 #define NBITMASK(nbits) MAXBITVAL(nbits)
  47 #define MAXNBVAL(nbyte) MAXBITVAL((nbyte) * 8)
  48
  49 /* crc defines */
  50 #define CRC16_INIT_VALUE 0xffff /* Initial CRC16 checksum value */
  51 #define CRC16_GOOD_VALUE 0xf0b8 /* Good final CRC16 checksum value */
  52
  53 /* 18-bytes of Ethernet address buffer length */
  54 #define ETHER_ADDR_STR_LEN      18
  55
  56 struct pktq_prec {
  57         struct sk_buff_head skblist;
  58         u16 max;                /* maximum number of queued packets */
  59 };
  60
  61 /* multi-priority pkt queue */
  62 struct pktq {
  63         u16 num_prec;   /* number of precedences in use */
  64         u16 hi_prec;    /* rapid dequeue hint (>= highest non-empty prec) */
  65         u16 max;        /* total max packets */
  66         u16 len;        /* total number of packets */
  67         /*
  68          * q array must be last since # of elements can be either
  69          * PKTQ_MAX_PREC or 1
  70          */
  71         struct pktq_prec q[PKTQ_MAX_PREC];
  72 };
  73
  74 /* operations on a specific precedence in packet queue */
  75
  76 static inline int pktq_plen(struct pktq *pq, int prec)
  77 {
  78         return pq->q[prec].skblist.qlen;
  79 }
  80
  81 static inline int pktq_pavail(struct pktq *pq, int prec)
  82 {
  83         return pq->q[prec].max - pq->q[prec].skblist.qlen;
  84 }
  85
  86 static inline bool pktq_pfull(struct pktq *pq, int prec)
  87 {
  88         return pq->q[prec].skblist.qlen >= pq->q[prec].max;
  89 }
  90
  91 static inline bool pktq_pempty(struct pktq *pq, int prec)
  92 {
  93         return skb_queue_empty(&pq->q[prec].skblist);
  94 }
  95
  96 static inline struct sk_buff *pktq_ppeek(struct pktq *pq, int prec)
  97 {
  98         return skb_peek(&pq->q[prec].skblist);
  99 }
 100
 101 static inline struct sk_buff *pktq_ppeek_tail(struct pktq *pq, int prec)
 102 {
 103         return skb_peek_tail(&pq->q[prec].skblist);
 104 }
 105
 106 struct sk_buff *brcmu_pktq_penq(struct pktq *pq, int prec, struct sk_buff *p);
 107 struct sk_buff *brcmu_pktq_penq_head(struct pktq *pq, int prec,
 108                                      struct sk_buff *p);
 109 struct sk_buff *brcmu_pktq_pdeq(struct pktq *pq, int prec);
 110 struct sk_buff *brcmu_pktq_pdeq_tail(struct pktq *pq, int prec);
 111 struct sk_buff *brcmu_pktq_pdeq_match(struct pktq *pq, int prec,
 112                                       bool (*match_fn)(struct sk_buff *p,
 113                                                        void *arg),
 114                                       void *arg);
 115
 116 /* packet primitives */
 117 struct sk_buff *brcmu_pkt_buf_get_skb(uint len);
 118 void brcmu_pkt_buf_free_skb(struct sk_buff *skb);
 119
 120 /* Empty the queue at particular precedence level */
 121 /* callback function fn(pkt, arg) returns true if pkt belongs to if */
 122 void brcmu_pktq_pflush(struct pktq *pq, int prec, bool dir,
 123                        bool (*fn)(struct sk_buff *, void *), void *arg);
 124
 125 /* operations on a set of precedences in packet queue */
 126
 127 int brcmu_pktq_mlen(struct pktq *pq, uint prec_bmp);
 128 struct sk_buff *brcmu_pktq_mdeq(struct pktq *pq, uint prec_bmp, int *prec_out);
 129
 130 /* operations on packet queue as a whole */
 131
 132 static inline int pktq_len(struct pktq *pq)
 133 {
 134         return (int)pq->len;
 135 }
 136
 137 static inline int pktq_max(struct pktq *pq)
 138 {
 139         return (int)pq->max;
 140 }
 141
 142 static inline int pktq_avail(struct pktq *pq)
 143 {
 144         return (int)(pq->max - pq->len);
 145 }
 146
 147 static inline bool pktq_full(struct pktq *pq)
 148 {
 149         return pq->len >= pq->max;
 150 }
 151
 152 static inline bool pktq_empty(struct pktq *pq)
 153 {
 154         return pq->len == 0;
 155 }
 156
 157 void brcmu_pktq_init(struct pktq *pq, int num_prec, int max_len);
 158 /* prec_out may be NULL if caller is not interested in return value */
 159 struct sk_buff *brcmu_pktq_peek_tail(struct pktq *pq, int *prec_out);
 160 void brcmu_pktq_flush(struct pktq *pq, bool dir,
 161                       bool (*fn)(struct sk_buff *, void *), void *arg);
 162
 163 /* externs */
 164 /* ip address */
 165 struct ipv4_addr;
 166
 167 /*
 168  * bitfield macros using masking and shift
 169  *
 170  * remark: the mask parameter should be a shifted mask.
 171  */
 172 static inline void brcmu_maskset32(u32 *var, u32 mask, u8 shift, u32 value)
 173 {
 174         value = (value << shift) & mask;
 175         *var = (*var & ~mask) | value;
 176 }
 177 static inline u32 brcmu_maskget32(u32 var, u32 mask, u8 shift)
 178 {
 179         return (var & mask) >> shift;
 180 }
 181 static inline void brcmu_maskset16(u16 *var, u16 mask, u8 shift, u16 value)
 182 {
 183         value = (value << shift) & mask;
 184         *var = (*var & ~mask) | value;
 185 }
 186 static inline u16 brcmu_maskget16(u16 var, u16 mask, u8 shift)
 187 {
 188         return (var & mask) >> shift;
 189 }
 190
 191 /* externs */
 192 /* format/print */
 193 #ifdef DEBUG
 194 void brcmu_prpkt(const char *msg, struct sk_buff *p0);
 195 #else
 196 #define brcmu_prpkt(a, b)
 197 #endif                          /* DEBUG */
 198
 199 #ifdef DEBUG
 200 __printf(3, 4)
 201 void brcmu_dbg_hex_dump(const void *data, size_t size, const char *fmt, ...);
 202 #else
 203 __printf(3, 4)
 204 static inline
 205 void brcmu_dbg_hex_dump(const void *data, size_t size, const char *fmt, ...)
 206 {
 207 }
 208 #endif
 209
 210 #define BRCMU_BOARDREV_LEN      8
 211 #define BRCMU_DOTREV_LEN        16
 212
 213 char *brcmu_boardrev_str(u32 brev, char *buf);
 214 char *brcmu_dotrev_str(u32 dotrev, char *buf);
 215
 216 #endif                          /* _BRCMU_UTILS_H_ */