package/broadcom-wl/src/kmod/pktq.h

   1 /*
   2  * Misc useful os-independent macros and functions.
   3  *
   4  * Copyright 2006, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  * $Id: bcmutils.h,v 1.1.1.16 2006/04/08 06:13:39 honor Exp $
  12  */
  13
  14 #ifndef _pktq_h_
  15 #define _pktq_h_
  16 #include <osl.h>
  17
  18 /* osl multi-precedence packet queue */
  19
  20 #define PKTQ_LEN_DEFAULT        128     /* Max 128 packets */
  21 #define PKTQ_MAX_PREC           16      /* Maximum precedence levels */
  22
  23 struct pktq {
  24         struct pktq_prec {
  25                 void *head;     /* first packet to dequeue */
  26                 void *tail;     /* last packet to dequeue */
  27                 uint16 len;     /* number of queued packets */
  28                 uint16 max;     /* maximum number of queued packets */
  29         } q[PKTQ_MAX_PREC];
  30         uint16 num_prec;        /* number of precedences in use */
  31         uint16 hi_prec;         /* rapid dequeue hint (>= highest non-empty prec) */
  32         uint16 max;             /* total max packets */
  33         uint16 len;             /* total number of packets */
  34 };
  35
  36 #define PKTQ_PREC_ITER(pq, prec)        for (prec = (pq)->num_prec - 1; prec >= 0; prec--)
  37
  38 /* forward definition of ether_addr structure used by some function prototypes */
  39
  40 struct ether_addr;
  41
  42 /* operations on a specific precedence in packet queue */
  43
  44 #define pktq_psetmax(pq, prec, _max)    ((pq)->q[prec].max = (_max))
  45 #define pktq_plen(pq, prec)             ((pq)->q[prec].len)
  46 #define pktq_pavail(pq, prec)           ((pq)->q[prec].max - (pq)->q[prec].len)
  47 #define pktq_pfull(pq, prec)            ((pq)->q[prec].len >= (pq)->q[prec].max)
  48 #define pktq_pempty(pq, prec)           ((pq)->q[prec].len == 0)
  49
  50 #define pktq_ppeek(pq, prec)            ((pq)->q[prec].head)
  51 #define pktq_ppeek_tail(pq, prec)       ((pq)->q[prec].tail)
  52
  53 extern void *pktq_penq(struct pktq *pq, int prec, void *p);
  54 extern void *pktq_penq_head(struct pktq *pq, int prec, void *p);
  55 extern void *pktq_pdeq(struct pktq *pq, int prec);
  56 extern void *pktq_pdeq_tail(struct pktq *pq, int prec);
  57 /* Empty the queue at particular precedence level */
  58 extern void pktq_pflush(osl_t *osh, struct pktq *pq, int prec, bool dir);
  59 /* Remove a specified packet from its queue */
  60 extern bool pktq_pdel(struct pktq *pq, void *p, int prec);
  61
  62 /* operations on a set of precedences in packet queue */
  63
  64 extern int pktq_mlen(struct pktq *pq, uint prec_bmp);
  65 extern void *pktq_mdeq(struct pktq *pq, uint prec_bmp, int *prec_out);
  66
  67 /* operations on packet queue as a whole */
  68
  69 #define pktq_len(pq)                    ((int)(pq)->len)
  70 #define pktq_max(pq)                    ((int)(pq)->max)
  71 #define pktq_avail(pq)                  ((int)((pq)->max - (pq)->len))
  72 #define pktq_full(pq)                   ((pq)->len >= (pq)->max)
  73 #define pktq_empty(pq)                  ((pq)->len == 0)
  74
  75 /* operations for single precedence queues */
  76 #define pktenq(pq, p)           pktq_penq((pq), 0, (p))
  77 #define pktenq_head(pq, p)      pktq_penq_head((pq), 0, (p))
  78 #define pktdeq(pq)              pktq_pdeq((pq), 0)
  79 #define pktdeq_tail(pq)         pktq_pdeq_tail((pq), 0)
  80
  81 extern void pktq_init(struct pktq *pq, int num_prec, int max_len);
  82 /* prec_out may be NULL if caller is not interested in return value */
  83 extern void *pktq_deq(struct pktq *pq, int *prec_out);
  84 extern void *pktq_deq_tail(struct pktq *pq, int *prec_out);
  85 extern void *pktq_peek(struct pktq *pq, int *prec_out);
  86 extern void *pktq_peek_tail(struct pktq *pq, int *prec_out);
  87 extern void pktq_flush(osl_t *osh, struct pktq *pq, bool dir); /* Empty the entire queue */
  88
  89 /* externs */
  90 /* packet */
  91 extern uint pktcopy(osl_t *osh, void *p, uint offset, int len, uchar *buf);
  92 extern uint pkttotlen(osl_t *osh, void *p);
  93 extern void *pktlast(osl_t *osh, void *p);
  94
  95 extern void pktsetprio(void *pkt, bool update_vtag);
  96
  97 #endif  /* _pktq_h_ */