drivers/atm/zatm.h

   1 /* drivers/atm/zatm.h - ZeitNet ZN122x device driver declarations */
   2
   3 /* Written 1995-1998 by Werner Almesberger, EPFL LRC/ICA */
   4
   5
   6 #ifndef DRIVER_ATM_ZATM_H
   7 #define DRIVER_ATM_ZATM_H
   8
   9 #include <linux/config.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/atm.h>
  12 #include <linux/atmdev.h>
  13 #include <linux/sonet.h>
  14 #include <linux/pci.h>
  15
  16
  17 #define DEV_LABEL       "zatm"
  18
  19 #define MAX_AAL5_PDU    10240   /* allocate for AAL5 PDUs of this size */
  20 #define MAX_RX_SIZE_LD  14      /* ceil(log2((MAX_AAL5_PDU+47)/48)) */
  21
  22 #define LOW_MARK        12      /* start adding new buffers if less than 12 */
  23 #define HIGH_MARK       30      /* stop adding buffers after reaching 30 */
  24 #define OFF_CNG_THRES   5       /* threshold for offset changes */
  25
  26 #define RX_SIZE         2       /* RX lookup entry size (in bytes) */
  27 #define NR_POOLS        32      /* number of free buffer pointers */
  28 #define POOL_SIZE       8       /* buffer entry size (in bytes) */
  29 #define NR_SHAPERS      16      /* number of shapers */
  30 #define SHAPER_SIZE     4       /* shaper entry size (in bytes) */
  31 #define VC_SIZE         32      /* VC dsc (TX or RX) size (in bytes) */
  32
  33 #define RING_ENTRIES    32      /* ring entries (without back pointer) */
  34 #define RING_WORDS      4       /* ring element size */
  35 #define RING_SIZE       (sizeof(unsigned long)*(RING_ENTRIES+1)*RING_WORDS)
  36
  37 #define NR_MBX          4       /* four mailboxes */
  38 #define MBX_RX_0        0       /* mailbox indices */
  39 #define MBX_RX_1        1
  40 #define MBX_TX_0        2
  41 #define MBX_TX_1        3
  42
  43
  44 /*
  45  * mkdep doesn't spot this dependency, but that's okay, because zatm.c uses
  46  * CONFIG_ATM_ZATM_EXACT_TS too.
  47  */
  48
  49 #ifdef CONFIG_ATM_ZATM_EXACT_TS
  50 #define POLL_INTERVAL   60      /* TSR poll interval in seconds; must be <=
  51                                    (2^31-1)/clock */
  52 #define TIMER_SHIFT     20      /* scale factor for fixed-point arithmetic;
  53                                    1 << TIMER_SHIFT must be
  54                                      (1)  <= (2^64-1)/(POLL_INTERVAL*clock),
  55                                      (2)  >> clock/10^6, and
  56                                      (3)  <= (2^32-1)/1000  */
  57 #define ADJ_IGN_THRES   1000000 /* don't adjust if we're off by more than that
  58                                    many usecs - this filters clock corrections,
  59                                    time zone changes, etc. */
  60 #define ADJ_REP_THRES   20000   /* report only differences of more than that
  61                                    many usecs (don't mention single lost timer
  62                                    ticks; 10 msec is only 0.03% anyway) */
  63 #define ADJ_MSG_THRES   5       /* issue complaints only if getting that many
  64                                    significant timer differences in a row */
  65 #endif
  66
  67
  68 struct zatm_vcc {
  69         /*-------------------------------- RX part */
  70         int rx_chan;                    /* RX channel, 0 if none */
  71         int pool;                       /* free buffer pool */
  72         /*-------------------------------- TX part */
  73         int tx_chan;                    /* TX channel, 0 if none */
  74         int shaper;                     /* shaper, <0 if none */
  75         struct sk_buff_head tx_queue;   /* list of buffers in transit */
  76         wait_queue_head_t tx_wait;      /* for close */
  77         u32 *ring;                      /* transmit ring */
  78         int ring_curr;                  /* current write position */
  79         int txing;                      /* number of transmits in progress */
  80         struct sk_buff_head backlog;    /* list of buffers waiting for ring */
  81 };
  82
  83 struct zatm_dev {
  84         /*-------------------------------- TX part */
  85         int tx_bw;                      /* remaining bandwidth */
  86         u32 free_shapers;               /* bit set */
  87         int ubr;                        /* UBR shaper; -1 if none */
  88         int ubr_ref_cnt;                /* number of VCs using UBR shaper */
  89         /*-------------------------------- RX part */
  90         int pool_ref[NR_POOLS];         /* free buffer pool usage counters */
  91         volatile struct sk_buff *last_free[NR_POOLS];
  92                                         /* last entry in respective pool */
  93         struct sk_buff_head pool[NR_POOLS];/* free buffer pools */
  94         struct zatm_pool_info pool_info[NR_POOLS]; /* pool information */
  95         /*-------------------------------- maps */
  96         struct atm_vcc **tx_map;        /* TX VCCs */
  97         struct atm_vcc **rx_map;        /* RX VCCs */
  98         int chans;                      /* map size, must be 2^n */
  99         /*-------------------------------- mailboxes */
 100         unsigned long mbx_start[NR_MBX];/* start addresses */
 101         u16 mbx_end[NR_MBX];            /* end offset (in bytes) */
 102         /*-------------------------------- other pointers */
 103         u32 pool_base;                  /* Free buffer pool dsc (word addr) */
 104         /*-------------------------------- ZATM links */
 105         struct atm_dev *more;           /* other ZATM devices */
 106 #ifdef CONFIG_ATM_ZATM_EXACT_TS
 107         /*-------------------------------- timestamp calculation */
 108         u32 last_clk;                   /* results of last poll: clock, */
 109         struct timeval last_time;       /*   virtual time and */
 110         struct timeval last_real_time;  /*   real time */
 111         u32 factor;                     /* multiplication factor */
 112         int timer_diffs;                /* number of significant deviations */
 113         struct zatm_t_hist timer_history[ZATM_TIMER_HISTORY_SIZE];
 114                                         /* record of timer synchronizations */
 115         int th_curr;                    /* current position */
 116 #endif
 117         /*-------------------------------- general information */
 118         int mem;                        /* RAM on board (in bytes) */
 119         int khz;                        /* timer clock */
 120         int copper;                     /* PHY type */
 121         unsigned char irq;              /* IRQ */
 122         unsigned int base;              /* IO base address */
 123         struct pci_dev *pci_dev;        /* PCI stuff */
 124 };
 125
 126
 127 #define ZATM_DEV(d) ((struct zatm_dev *) (d)->dev_data)
 128 #define ZATM_VCC(d) ((struct zatm_vcc *) (d)->dev_data)
 129
 130
 131 struct zatm_skb_prv {
 132         struct atm_skb_data _;          /* reserved */
 133         u32 *dsc;                       /* pointer to skb's descriptor */
 134 };
 135
 136 #define ZATM_PRV_DSC(skb) (((struct zatm_skb_prv *) (skb)->cb)->dsc)
 137
 138 #endif