summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/brcm80211/include/brcmu_utils.h
blob: 7d0f46e0eb95a071d4f40ab16fefcb6cfb7c2570 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef	_BRCMU_UTILS_H_
#define	_BRCMU_UTILS_H_

#include <linux/skbuff.h>

/*
 * Spin at most 'us' microseconds while 'exp' is true.
 * Caller should explicitly test 'exp' when this completes
 * and take appropriate error action if 'exp' is still true.
 */
#define SPINWAIT(exp, us) { \
	uint countdown = (us) + 9; \
	while ((exp) && (countdown >= 10)) {\
		udelay(10); \
		countdown -= 10; \
	} \
}

/* osl multi-precedence packet queue */
#define PKTQ_LEN_DEFAULT        128	/* Max 128 packets */
#define PKTQ_MAX_PREC           16	/* Maximum precedence levels */

#define BCME_STRLEN		64	/* Max string length for BCM errors */

/* the largest reasonable packet buffer driver uses for ethernet MTU in bytes */
#define	PKTBUFSZ	2048

#ifndef setbit
#ifndef NBBY			/* the BSD family defines NBBY */
#define	NBBY	8		/* 8 bits per byte */
#endif				/* #ifndef NBBY */
#define	setbit(a, i)	(((u8 *)a)[(i)/NBBY] |= 1<<((i)%NBBY))
#define	clrbit(a, i)	(((u8 *)a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
#define	isset(a, i)	(((const u8 *)a)[(i)/NBBY] & (1<<((i)%NBBY)))
#define	isclr(a, i)	((((const u8 *)a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
#endif				/* setbit */

#define	NBITS(type)	(sizeof(type) * 8)
#define NBITVAL(nbits)	(1 << (nbits))
#define MAXBITVAL(nbits)	((1 << (nbits)) - 1)
#define	NBITMASK(nbits)	MAXBITVAL(nbits)
#define MAXNBVAL(nbyte)	MAXBITVAL((nbyte) * 8)

/* crc defines */
#define CRC16_INIT_VALUE 0xffff	/* Initial CRC16 checksum value */
#define CRC16_GOOD_VALUE 0xf0b8	/* Good final CRC16 checksum value */

/* 18-bytes of Ethernet address buffer length */
#define ETHER_ADDR_STR_LEN	18

struct pktq_prec {
	struct sk_buff *head;	/* first packet to dequeue */
	struct sk_buff *tail;	/* last packet to dequeue */
	u16 len;		/* number of queued packets */
	u16 max;		/* maximum number of queued packets */
};

/* multi-priority pkt queue */
struct pktq {
	u16 num_prec;	/* number of precedences in use */
	u16 hi_prec;	/* rapid dequeue hint (>= highest non-empty prec) */
	u16 max;	/* total max packets */
	u16 len;	/* total number of packets */
	/*
	 * q array must be last since # of elements can be either
	 * PKTQ_MAX_PREC or 1
	 */
	struct pktq_prec q[PKTQ_MAX_PREC];
};

/* operations on a specific precedence in packet queue */

static inline int pktq_plen(struct pktq *pq, int prec)
{
	return pq->q[prec].len;
}

static inline int pktq_pavail(struct pktq *pq, int prec)
{
	return pq->q[prec].max - pq->q[prec].len;
}

static inline bool pktq_pfull(struct pktq *pq, int prec)
{
	return pq->q[prec].len >= pq->q[prec].max;
}

static inline bool pktq_pempty(struct pktq *pq, int prec)
{
	return pq->q[prec].len == 0;
}

static inline struct sk_buff *pktq_ppeek(struct pktq *pq, int prec)
{
	return pq->q[prec].head;
}

static inline struct sk_buff *pktq_ppeek_tail(struct pktq *pq, int prec)
{
	return pq->q[prec].tail;
}

extern struct sk_buff *brcmu_pktq_penq(struct pktq *pq, int prec,
				 struct sk_buff *p);
extern struct sk_buff *brcmu_pktq_penq_head(struct pktq *pq, int prec,
				      struct sk_buff *p);
extern struct sk_buff *brcmu_pktq_pdeq(struct pktq *pq, int prec);
extern struct sk_buff *brcmu_pktq_pdeq_tail(struct pktq *pq, int prec);

/* packet primitives */
extern struct sk_buff *brcmu_pkt_buf_get_skb(uint len);
extern void brcmu_pkt_buf_free_skb(struct sk_buff *skb);

/* Empty the queue at particular precedence level */
/* callback function fn(pkt, arg) returns true if pkt belongs to if */
extern void brcmu_pktq_pflush(struct pktq *pq, int prec,
	bool dir, bool (*fn)(struct sk_buff *, void *), void *arg);

/* operations on a set of precedences in packet queue */

extern int brcmu_pktq_mlen(struct pktq *pq, uint prec_bmp);
extern struct sk_buff *brcmu_pktq_mdeq(struct pktq *pq, uint prec_bmp,
	int *prec_out);

/* operations on packet queue as a whole */

static inline int pktq_len(struct pktq *pq)
{
	return (int)pq->len;
}

static inline int pktq_max(struct pktq *pq)
{
	return (int)pq->max;
}

static inline int pktq_avail(struct pktq *pq)
{
	return (int)(pq->max - pq->len);
}

static inline bool pktq_full(struct pktq *pq)
{
	return pq->len >= pq->max;
}

static inline bool pktq_empty(struct pktq *pq)
{
	return pq->len == 0;
}

extern void brcmu_pktq_init(struct pktq *pq, int num_prec, int max_len);
/* prec_out may be NULL if caller is not interested in return value */
extern struct sk_buff *brcmu_pktq_peek_tail(struct pktq *pq, int *prec_out);
extern void brcmu_pktq_flush(struct pktq *pq, bool dir,
		bool (*fn)(struct sk_buff *, void *), void *arg);

/* externs */
/* packet */
extern uint brcmu_pktfrombuf(struct sk_buff *p,
	uint offset, int len, unsigned char *buf);
extern uint brcmu_pkttotlen(struct sk_buff *p);

/* ip address */
struct ipv4_addr;

#ifdef BCMDBG
extern void brcmu_prpkt(const char *msg, struct sk_buff *p0);
#else
#define brcmu_prpkt(a, b)
#endif				/* BCMDBG */

/* externs */
/* format/print */
#if defined(BCMDBG)
extern int brcmu_format_hex(char *str, const void *bytes, int len);
#endif

#endif				/* _BRCMU_UTILS_H_ */