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

   1 /*
   2  * Copyright (c) 2010 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #ifndef _BRCMU_UTILS_H_
  18 #define _BRCMU_UTILS_H_
  19
  20 #include <linux/skbuff.h>
  21
  22 /*
  23  * Spin at most 'us' microseconds while 'exp' is true.
  24  * Caller should explicitly test 'exp' when this completes
  25  * and take appropriate error action if 'exp' is still true.
  26  */
  27 #define SPINWAIT(exp, us) { \
  28         uint countdown = (us) + 9; \
  29         while ((exp) && (countdown >= 10)) {\
  30                 udelay(10); \
  31                 countdown -= 10; \
  32         } \
  33 }
  34
  35 /* osl multi-precedence packet queue */
  36 #define PKTQ_LEN_DEFAULT        128     /* Max 128 packets */
  37 #define PKTQ_MAX_PREC           16      /* Maximum precedence levels */
  38
  39 #define BCME_STRLEN             64      /* Max string length for BCM errors */
  40
  41 /* the largest reasonable packet buffer driver uses for ethernet MTU in bytes */
  42 #define PKTBUFSZ        2048
  43
  44 #ifndef setbit
  45 #ifndef NBBY                    /* the BSD family defines NBBY */
  46 #define NBBY    8               /* 8 bits per byte */
  47 #endif                          /* #ifndef NBBY */
  48 #define setbit(a, i)    (((u8 *)a)[(i)/NBBY] |= 1<<((i)%NBBY))
  49 #define clrbit(a, i)    (((u8 *)a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
  50 #define isset(a, i)     (((const u8 *)a)[(i)/NBBY] & (1<<((i)%NBBY)))
  51 #define isclr(a, i)     ((((const u8 *)a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
  52 #endif                          /* setbit */
  53
  54 #define NBITS(type)     (sizeof(type) * 8)
  55 #define NBITVAL(nbits)  (1 << (nbits))
  56 #define MAXBITVAL(nbits)        ((1 << (nbits)) - 1)
  57 #define NBITMASK(nbits) MAXBITVAL(nbits)
  58 #define MAXNBVAL(nbyte) MAXBITVAL((nbyte) * 8)
  59
  60 /* crc defines */
  61 #define CRC16_INIT_VALUE 0xffff /* Initial CRC16 checksum value */
  62 #define CRC16_GOOD_VALUE 0xf0b8 /* Good final CRC16 checksum value */
  63
  64 /* 18-bytes of Ethernet address buffer length */
  65 #define ETHER_ADDR_STR_LEN      18
  66
  67 struct pktq_prec {
  68         struct sk_buff *head;   /* first packet to dequeue */
  69         struct sk_buff *tail;   /* last packet to dequeue */
  70         u16 len;                /* number of queued packets */
  71         u16 max;                /* maximum number of queued packets */
  72 };
  73
  74 /* multi-priority pkt queue */
  75 struct pktq {
  76         u16 num_prec;   /* number of precedences in use */
  77         u16 hi_prec;    /* rapid dequeue hint (>= highest non-empty prec) */
  78         u16 max;        /* total max packets */
  79         u16 len;        /* total number of packets */
  80         /*
  81          * q array must be last since # of elements can be either
  82          * PKTQ_MAX_PREC or 1
  83          */
  84         struct pktq_prec q[PKTQ_MAX_PREC];
  85 };
  86
  87 /* operations on a specific precedence in packet queue */
  88
  89 static inline int pktq_plen(struct pktq *pq, int prec)
  90 {
  91         return pq->q[prec].len;
  92 }
  93
  94 static inline int pktq_pavail(struct pktq *pq, int prec)
  95 {
  96         return pq->q[prec].max - pq->q[prec].len;
  97 }
  98
  99 static inline bool pktq_pfull(struct pktq *pq, int prec)
 100 {
 101         return pq->q[prec].len >= pq->q[prec].max;
 102 }
 103
 104 static inline bool pktq_pempty(struct pktq *pq, int prec)
 105 {
 106         return pq->q[prec].len == 0;
 107 }
 108
 109 static inline struct sk_buff *pktq_ppeek(struct pktq *pq, int prec)
 110 {
 111         return pq->q[prec].head;
 112 }
 113
 114 static inline struct sk_buff *pktq_ppeek_tail(struct pktq *pq, int prec)
 115 {
 116         return pq->q[prec].tail;
 117 }
 118
 119 extern struct sk_buff *brcmu_pktq_penq(struct pktq *pq, int prec,
 120                                  struct sk_buff *p);
 121 extern struct sk_buff *brcmu_pktq_penq_head(struct pktq *pq, int prec,
 122                                       struct sk_buff *p);
 123 extern struct sk_buff *brcmu_pktq_pdeq(struct pktq *pq, int prec);
 124 extern struct sk_buff *brcmu_pktq_pdeq_tail(struct pktq *pq, int prec);
 125
 126 /* packet primitives */
 127 extern struct sk_buff *brcmu_pkt_buf_get_skb(uint len);
 128 extern void brcmu_pkt_buf_free_skb(struct sk_buff *skb);
 129
 130 /* Empty the queue at particular precedence level */
 131 /* callback function fn(pkt, arg) returns true if pkt belongs to if */
 132 extern void brcmu_pktq_pflush(struct pktq *pq, int prec,
 133         bool dir, bool (*fn)(struct sk_buff *, void *), void *arg);
 134
 135 /* operations on a set of precedences in packet queue */
 136
 137 extern int brcmu_pktq_mlen(struct pktq *pq, uint prec_bmp);
 138 extern struct sk_buff *brcmu_pktq_mdeq(struct pktq *pq, uint prec_bmp,
 139         int *prec_out);
 140
 141 /* operations on packet queue as a whole */
 142
 143 static inline int pktq_len(struct pktq *pq)
 144 {
 145         return (int)pq->len;
 146 }
 147
 148 static inline int pktq_max(struct pktq *pq)
 149 {
 150         return (int)pq->max;
 151 }
 152
 153 static inline int pktq_avail(struct pktq *pq)
 154 {
 155         return (int)(pq->max - pq->len);
 156 }
 157
 158 static inline bool pktq_full(struct pktq *pq)
 159 {
 160         return pq->len >= pq->max;
 161 }
 162
 163 static inline bool pktq_empty(struct pktq *pq)
 164 {
 165         return pq->len == 0;
 166 }
 167
 168 extern void brcmu_pktq_init(struct pktq *pq, int num_prec, int max_len);
 169 /* prec_out may be NULL if caller is not interested in return value */
 170 extern struct sk_buff *brcmu_pktq_peek_tail(struct pktq *pq, int *prec_out);
 171 extern void brcmu_pktq_flush(struct pktq *pq, bool dir,
 172                 bool (*fn)(struct sk_buff *, void *), void *arg);
 173
 174 /* externs */
 175 /* packet */
 176 extern uint brcmu_pktfrombuf(struct sk_buff *p,
 177         uint offset, int len, unsigned char *buf);
 178 extern uint brcmu_pkttotlen(struct sk_buff *p);
 179
 180 /* ip address */
 181 struct ipv4_addr;
 182
 183 #ifdef BCMDBG
 184 extern void brcmu_prpkt(const char *msg, struct sk_buff *p0);
 185 #else
 186 #define brcmu_prpkt(a, b)
 187 #endif                          /* BCMDBG */
 188
 189 /* externs */
 190 /* format/print */
 191 #if defined(BCMDBG)
 192 extern int brcmu_format_hex(char *str, const void *bytes, int len);
 193 #endif
 194
 195 #endif                          /* _BRCMU_UTILS_H_ */