skdim.c

linux-2.6.15.6

static SK_U64
GetIsrCalls(SK_AC *pAC) {
    SK_U64   RxPort0IntDiff = 0;
    SK_U64   RxPort1IntDiff = 0;
    SK_U64   TxPort0IntDiff = 0;
    SK_U64   TxPort1IntDiff = 0;

    if (pAC->DynIrqModInfo.MaskIrqModeration == IRQ_MASK_TX_ONLY) {
        if (pAC->GIni.GIMacsFound == 2) {
            TxPort1IntDiff = pAC->Pnmi.Port[1].TxIntrCts - 
                             pAC->DynIrqModInfo.PrevPort1TxIntrCts;
        }
        TxPort0IntDiff = pAC->Pnmi.Port[0].TxIntrCts - 
                         pAC->DynIrqModInfo.PrevPort0TxIntrCts;
    } else if (pAC->DynIrqModInfo.MaskIrqModeration == IRQ_MASK_RX_ONLY) {
        if (pAC->GIni.GIMacsFound == 2) {
            RxPort1IntDiff = pAC->Pnmi.Port[1].RxIntrCts - 
                             pAC->DynIrqModInfo.PrevPort1RxIntrCts;
        }
        RxPort0IntDiff = pAC->Pnmi.Port[0].RxIntrCts - 
                         pAC->DynIrqModInfo.PrevPort0RxIntrCts;
    } else {
        if (pAC->GIni.GIMacsFound == 2) {
            RxPort1IntDiff = pAC->Pnmi.Port[1].RxIntrCts - 
                             pAC->DynIrqModInfo.PrevPort1RxIntrCts;
            TxPort1IntDiff = pAC->Pnmi.Port[1].TxIntrCts - 
                             pAC->DynIrqModInfo.PrevPort1TxIntrCts;
        } 
        RxPort0IntDiff = pAC->Pnmi.Port[0].RxIntrCts - 
                         pAC->DynIrqModInfo.PrevPort0RxIntrCts;
        TxPort0IntDiff = pAC->Pnmi.Port[0].TxIntrCts - 
                         pAC->DynIrqModInfo.PrevPort0TxIntrCts;
    }

    return (RxPort0IntDiff + RxPort1IntDiff + TxPort0IntDiff + TxPort1IntDiff);
}

/*******************************************************************************
** Function     : GetRxCalls
** Description  : This function will return the number of times a receive inter-
**                rupt was processed. This is needed to evaluate any resizing 
**                factor.
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : SK_U64: the number of RX-ints being processed
** Notes        : It makes only sense to call this function, when dynamic 
**                interrupt moderation is applied
*******************************************************************************/

static SK_U64
GetRxCalls(SK_AC *pAC) {
    SK_U64   RxPort0IntDiff = 0;
    SK_U64   RxPort1IntDiff = 0;

    if (pAC->GIni.GIMacsFound == 2) {
        RxPort1IntDiff = pAC->Pnmi.Port[1].RxIntrCts - 
                         pAC->DynIrqModInfo.PrevPort1RxIntrCts;
    }
    RxPort0IntDiff = pAC->Pnmi.Port[0].RxIntrCts - 
                     pAC->DynIrqModInfo.PrevPort0RxIntrCts;

    return (RxPort0IntDiff + RxPort1IntDiff);
}

/*******************************************************************************
** Function     : SetCurrIntCtr
** Description  : Will store the current number orf occured interrupts in the 
**                adapter context. This is needed to evaluated the number of 
**                interrupts within a current timeframe.
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : void (!)
** Notes        : -
*******************************************************************************/

static void
SetCurrIntCtr(SK_AC *pAC) {
    if (pAC->GIni.GIMacsFound == 2) {
        pAC->DynIrqModInfo.PrevPort1RxIntrCts = pAC->Pnmi.Port[1].RxIntrCts;
        pAC->DynIrqModInfo.PrevPort1TxIntrCts = pAC->Pnmi.Port[1].TxIntrCts;
    } 
    pAC->DynIrqModInfo.PrevPort0RxIntrCts = pAC->Pnmi.Port[0].RxIntrCts;
    pAC->DynIrqModInfo.PrevPort0TxIntrCts = pAC->Pnmi.Port[0].TxIntrCts;
}

/*******************************************************************************
** Function     : IsIntModEnabled()
** Description  : Retrieves the current value of the interrupts moderation
**                command register. Its content determines whether any 
**                moderation is running or not.
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : SK_TRUE  : if mod timer running
**                SK_FALSE : if no moderation is being performed
** Notes        : -
*******************************************************************************/

static SK_BOOL
IsIntModEnabled(SK_AC *pAC) {
    unsigned long CtrCmd;

    SK_IN32(pAC->IoBase, B2_IRQM_CTRL, &CtrCmd);
    if ((CtrCmd & TIM_START) == TIM_START) {
       return SK_TRUE;
    } else {
       return SK_FALSE;
    }
}

/*******************************************************************************
** Function     : EnableIntMod()
** Description  : Enables the interrupt moderation using the values stored in
**                in the pAC->DynIntMod data structure
** Programmer   : Ralph Roesler
** Last Modified: 22-mar-03
** Returns      : -
** Notes        : -
*******************************************************************************/

static void
EnableIntMod(SK_AC *pAC) {
    unsigned long ModBase;

    if (pAC->GIni.GIChipId == CHIP_ID_GENESIS) {
       ModBase = C_CLK_FREQ_GENESIS / pAC->DynIrqModInfo.MaxModIntsPerSec;
    } else {
       ModBase = C_CLK_FREQ_YUKON / pAC->DynIrqModInfo.MaxModIntsPerSec;
    }

    SK_OUT32(pAC->IoBase, B2_IRQM_INI,  ModBase);
    SK_OUT32(pAC->IoBase, B2_IRQM_MSK,  pAC->DynIrqModInfo.MaskIrqModeration);
    SK_OUT32(pAC->IoBase, B2_IRQM_CTRL, TIM_START);
    if (M_DIMINFO.DisplayStats) {
        printk("Enabled interrupt moderation (%i ints/sec)\n",
               M_DIMINFO.MaxModIntsPerSec);
    }
}

/*******************************************************************************
** Function     : DisableIntMod()
** Description  : Disbles the interrupt moderation independent of what inter-
**                rupts are running or not
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : -
** Notes        : -
*******************************************************************************/

static void 
DisableIntMod(SK_AC *pAC) {

    SK_OUT32(pAC->IoBase, B2_IRQM_CTRL, TIM_STOP);
    if (M_DIMINFO.DisplayStats) {
        printk("Disabled interrupt moderation\n");
    }
} 

/*******************************************************************************
** Function     : ResizeDimTimerDuration();
** Description  : Checks the current used descriptor ratio and resizes the 
**                duration timer (longer/smaller) if possible. 
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : -
** Notes        : There are both maximum and minimum timer duration value. 
**                This function assumes that interrupt moderation is already
**                enabled!
*******************************************************************************/

static void 
ResizeDimTimerDuration(SK_AC *pAC) {
    SK_BOOL IncreaseTimerDuration;
    int     TotalMaxNbrDescr;
    int     UsedDescrRatio;
    int     RatioDiffAbs;
    int     RatioDiffRel;
    int     NewMaxModIntsPerSec;
    int     ModAdjValue;
    long    ModBase;

    /*
    ** Check first if we are allowed to perform any modification
    */
    if (IsIntModEnabled(pAC)) { 
        if (M_DIMINFO.IntModTypeSelect != C_INT_MOD_DYNAMIC) {
            return; 
        } else {
            if (M_DIMINFO.ModJustEnabled) {
                M_DIMINFO.ModJustEnabled = SK_FALSE;
                return;
            }
        }
    }

    /*
    ** If we got until here, we have to evaluate the amount of the
    ** descriptor ratio change...
    */
    TotalMaxNbrDescr = pAC->RxDescrPerRing * GetRxCalls(pAC);
    UsedDescrRatio   = (M_DIMINFO.NbrProcessedDescr * 100) / TotalMaxNbrDescr;

    if (UsedDescrRatio > M_DIMINFO.PrevUsedDescrRatio) {
        RatioDiffAbs = (UsedDescrRatio - M_DIMINFO.PrevUsedDescrRatio);
        RatioDiffRel = (RatioDiffAbs * 100) / UsedDescrRatio;
        M_DIMINFO.PrevUsedDescrRatio = UsedDescrRatio;
        IncreaseTimerDuration = SK_FALSE;  /* in other words: DECREASE */
    } else if (UsedDescrRatio < M_DIMINFO.PrevUsedDescrRatio) {
        RatioDiffAbs = (M_DIMINFO.PrevUsedDescrRatio - UsedDescrRatio);
        RatioDiffRel = (RatioDiffAbs * 100) / M_DIMINFO.PrevUsedDescrRatio;
        M_DIMINFO.PrevUsedDescrRatio = UsedDescrRatio;
        IncreaseTimerDuration = SK_TRUE;   /* in other words: INCREASE */
    } else {
        RatioDiffAbs = (M_DIMINFO.PrevUsedDescrRatio - UsedDescrRatio);
        RatioDiffRel = (RatioDiffAbs * 100) / M_DIMINFO.PrevUsedDescrRatio;
        M_DIMINFO.PrevUsedDescrRatio = UsedDescrRatio;
        IncreaseTimerDuration = SK_TRUE;   /* in other words: INCREASE */
    }

    /*
    ** Now we can determine the change in percent
    */
    if ((RatioDiffRel >= 0) && (RatioDiffRel <= 5) ) {
       ModAdjValue = 1;  /*  1% change - maybe some other value in future */
    } else if ((RatioDiffRel > 5) && (RatioDiffRel <= 10) ) {
       ModAdjValue = 1;  /*  1% change - maybe some other value in future */
    } else if ((RatioDiffRel > 10) && (RatioDiffRel <= 15) ) {
       ModAdjValue = 1;  /*  1% change - maybe some other value in future */
    } else {
       ModAdjValue = 1;  /*  1% change - maybe some other value in future */
    }

    if (IncreaseTimerDuration) {
       NewMaxModIntsPerSec =  M_DIMINFO.MaxModIntsPerSec +
                             (M_DIMINFO.MaxModIntsPerSec * ModAdjValue) / 100;
    } else {
       NewMaxModIntsPerSec =  M_DIMINFO.MaxModIntsPerSec -
                             (M_DIMINFO.MaxModIntsPerSec * ModAdjValue) / 100;
    }

    /* 
    ** Check if we exceed boundaries...
    */
    if ( (NewMaxModIntsPerSec > M_DIMINFO.MaxModIntsPerSecUpperLimit) ||
         (NewMaxModIntsPerSec < M_DIMINFO.MaxModIntsPerSecLowerLimit)) {
        if (M_DIMINFO.DisplayStats) {
            printk("Cannot change ModTim from %i to %i ints/sec\n",
                   M_DIMINFO.MaxModIntsPerSec, NewMaxModIntsPerSec);
        }
        return;
    } else {
        if (M_DIMINFO.DisplayStats) {
            printk("Resized ModTim from %i to %i ints/sec\n",
                   M_DIMINFO.MaxModIntsPerSec, NewMaxModIntsPerSec);
        }
    }

    M_DIMINFO.MaxModIntsPerSec = NewMaxModIntsPerSec;

    if (pAC->GIni.GIChipId == CHIP_ID_GENESIS) {
        ModBase = C_CLK_FREQ_GENESIS / pAC->DynIrqModInfo.MaxModIntsPerSec;
    } else {
        ModBase = C_CLK_FREQ_YUKON / pAC->DynIrqModInfo.MaxModIntsPerSec;
    }

    /* 
    ** We do not need to touch any other registers
    */
    SK_OUT32(pAC->IoBase, B2_IRQM_INI, ModBase);
} 

/*******************************************************************************
** Function     : DisplaySelectedModerationType()
** Description  : Displays what type of moderation we have
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : void!
** Notes        : -
*******************************************************************************/

static void
DisplaySelectedModerationType(SK_AC *pAC) {

    if (pAC->DynIrqModInfo.DisplayStats) {
        if (pAC->DynIrqModInfo.IntModTypeSelect == C_INT_MOD_STATIC) {
             printk("Static int moderation runs with %i INTS/sec\n",
                    pAC->DynIrqModInfo.MaxModIntsPerSec);
        } else if (pAC->DynIrqModInfo.IntModTypeSelect == C_INT_MOD_DYNAMIC) {
             if (IsIntModEnabled(pAC)) {
                printk("Dynamic int moderation runs with %i INTS/sec\n",
                       pAC->DynIrqModInfo.MaxModIntsPerSec);
             } else {
                printk("Dynamic int moderation currently not applied\n");
             }
        } else {
             printk("No interrupt moderation selected!\n");
        }
    }
}

/*******************************************************************************
** Function     : DisplaySelectedModerationMask()
** Description  : Displays what interrupts are moderated
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : void!
** Notes        : -
*******************************************************************************/

static void
DisplaySelectedModerationMask(SK_AC *pAC) {

    if (pAC->DynIrqModInfo.DisplayStats) {
        if (pAC->DynIrqModInfo.IntModTypeSelect != C_INT_MOD_NONE) {
            switch (pAC->DynIrqModInfo.MaskIrqModeration) {
                case IRQ_MASK_TX_ONLY: 
                   printk("Only Tx-interrupts are moderated\n");
                   break;
                case IRQ_MASK_RX_ONLY: 
                   printk("Only Rx-interrupts are moderated\n");
                   break;
                case IRQ_MASK_SP_ONLY: 
                   printk("Only special-interrupts are moderated\n");
                   break;
                case IRQ_MASK_TX_RX: 
                   printk("Tx- and Rx-interrupts are moderated\n");
                   break;
                case IRQ_MASK_SP_RX: 
                   printk("Special- and Rx-interrupts are moderated\n");
                   break;
                case IRQ_MASK_SP_TX: 
                   printk("Special- and Tx-interrupts are moderated\n");
                   break;
                case IRQ_MASK_RX_TX_SP:
                   printk("All Rx-, Tx and special-interrupts are moderated\n");
                   break;
                default:
                   printk("Don't know what is moderated\n");
                   break;
            }
        } else {
            printk("No specific interrupts masked for moderation\n");
        }
    } 
}

/*******************************************************************************
** Function     : DisplayDescrRatio
** Description  : Like the name states...
** Programmer   : Ralph Roesler
** Last Modified: 23-mar-03
** Returns      : void!
** Notes        : -
*******************************************************************************/

static void
DisplayDescrRatio(SK_AC *pAC) {
    int TotalMaxNbrDescr = 0;

    if (pAC->DynIrqModInfo.DisplayStats) {
        TotalMaxNbrDescr = pAC->RxDescrPerRing * GetRxCalls(pAC);
        printk("Ratio descriptors: %i/%i\n",
               M_DIMINFO.NbrProcessedDescr, TotalMaxNbrDescr);
    }
}

/*******************************************************************************
**
** End of file
**
*******************************************************************************/