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via-velocity: Add ethtool interrupt coalescing support 

(Partially from the upstream VIA driver). Tweaking the number of
frames-per-interrupt and timer-until-interrupt can reduce the amount of
CPU work quite a lot.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Kagstrom 2009-11-25 22:10:12 +00:00 committed by David S. Miller
parent da95b2d422
commit 6dfc4b95b2
2 changed files with 165 additions and 2 deletions
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160
drivers/net/via-velocity.c
View File

@ -1246,6 +1246,66 @@ static void mii_init(struct velocity_info *vptr, u32 mii_status)
}
}
/**
* setup_queue_timers - Setup interrupt timers
*
* Setup interrupt frequency during suppression (timeout if the frame
* count isn't filled).
*/
static void setup_queue_timers(struct velocity_info *vptr)
{
/* Only for newer revisions */
if (vptr->rev_id >= REV_ID_VT3216_A0) {
u8 txqueue_timer = 0;
u8 rxqueue_timer = 0;
if (vptr->mii_status & (VELOCITY_SPEED_1000 |
VELOCITY_SPEED_100)) {
txqueue_timer = vptr->options.txqueue_timer;
rxqueue_timer = vptr->options.rxqueue_timer;
}
writeb(txqueue_timer, &vptr->mac_regs->TQETMR);
writeb(rxqueue_timer, &vptr->mac_regs->RQETMR);
}
}
/**
* setup_adaptive_interrupts - Setup interrupt suppression
*
* @vptr velocity adapter
*
* The velocity is able to suppress interrupt during high interrupt load.
* This function turns on that feature.
*/
static void setup_adaptive_interrupts(struct velocity_info *vptr)
{
struct mac_regs __iomem *regs = vptr->mac_regs;
u16 tx_intsup = vptr->options.tx_intsup;
u16 rx_intsup = vptr->options.rx_intsup;
/* Setup default interrupt mask (will be changed below) */
vptr->int_mask = INT_MASK_DEF;
/* Set Tx Interrupt Suppression Threshold */
writeb(CAMCR_PS0, &regs->CAMCR);
if (tx_intsup != 0) {
vptr->int_mask &= ~(ISR_PTXI | ISR_PTX0I | ISR_PTX1I |
ISR_PTX2I | ISR_PTX3I);
writew(tx_intsup, &regs->ISRCTL);
} else
writew(ISRCTL_TSUPDIS, &regs->ISRCTL);
/* Set Rx Interrupt Suppression Threshold */
writeb(CAMCR_PS1, &regs->CAMCR);
if (rx_intsup != 0) {
vptr->int_mask &= ~ISR_PRXI;
writew(rx_intsup, &regs->ISRCTL);
} else
writew(ISRCTL_RSUPDIS, &regs->ISRCTL);
/* Select page to interrupt hold timer */
writeb(0, &regs->CAMCR);
}
/**
* velocity_init_registers - initialise MAC registers
@ -1332,7 +1392,7 @@ static void velocity_init_registers(struct velocity_info *vptr,
*/
enable_mii_autopoll(regs);
vptr->int_mask = INT_MASK_DEF;
setup_adaptive_interrupts(vptr);
writel(vptr->rx.pool_dma, &regs->RDBaseLo);
writew(vptr->options.numrx - 1, &regs->RDCSize);
@ -1789,6 +1849,8 @@ static void velocity_error(struct velocity_info *vptr, int status)
BYTE_REG_BITS_OFF(TESTCFG_HBDIS, &regs->TESTCFG);
else
BYTE_REG_BITS_ON(TESTCFG_HBDIS, &regs->TESTCFG);
setup_queue_timers(vptr);
}
/*
* Get link status from PHYSR0
@ -3199,6 +3261,100 @@ static void velocity_set_msglevel(struct net_device *dev, u32 value)
msglevel = value;
}
static int get_pending_timer_val(int val)
{
int mult_bits = val >> 6;
int mult = 1;
switch (mult_bits)
{
case 1:
mult = 4; break;
case 2:
mult = 16; break;
case 3:
mult = 64; break;
case 0:
default:
break;
}
return (val & 0x3f) * mult;
}
static void set_pending_timer_val(int *val, u32 us)
{
u8 mult = 0;
u8 shift = 0;
if (us >= 0x3f) {
mult = 1; /* mult with 4 */
shift = 2;
}
if (us >= 0x3f * 4) {
mult = 2; /* mult with 16 */
shift = 4;
}
if (us >= 0x3f * 16) {
mult = 3; /* mult with 64 */
shift = 6;
}
*val = (mult << 6) | ((us >> shift) & 0x3f);
}
static int velocity_get_coalesce(struct net_device *dev,
struct ethtool_coalesce *ecmd)
{
struct velocity_info *vptr = netdev_priv(dev);
ecmd->tx_max_coalesced_frames = vptr->options.tx_intsup;
ecmd->rx_max_coalesced_frames = vptr->options.rx_intsup;
ecmd->rx_coalesce_usecs = get_pending_timer_val(vptr->options.rxqueue_timer);
ecmd->tx_coalesce_usecs = get_pending_timer_val(vptr->options.txqueue_timer);
return 0;
}
static int velocity_set_coalesce(struct net_device *dev,
struct ethtool_coalesce *ecmd)
{
struct velocity_info *vptr = netdev_priv(dev);
int max_us = 0x3f * 64;
/* 6 bits of */
if (ecmd->tx_coalesce_usecs > max_us)
return -EINVAL;
if (ecmd->rx_coalesce_usecs > max_us)
return -EINVAL;
if (ecmd->tx_max_coalesced_frames > 0xff)
return -EINVAL;
if (ecmd->rx_max_coalesced_frames > 0xff)
return -EINVAL;
vptr->options.rx_intsup = ecmd->rx_max_coalesced_frames;
vptr->options.tx_intsup = ecmd->tx_max_coalesced_frames;
set_pending_timer_val(&vptr->options.rxqueue_timer,
ecmd->rx_coalesce_usecs);
set_pending_timer_val(&vptr->options.txqueue_timer,
ecmd->tx_coalesce_usecs);
/* Setup the interrupt suppression and queue timers */
mac_disable_int(vptr->mac_regs);
setup_adaptive_interrupts(vptr);
setup_queue_timers(vptr);
mac_write_int_mask(vptr->int_mask, vptr->mac_regs);
mac_clear_isr(vptr->mac_regs);
mac_enable_int(vptr->mac_regs);
return 0;
}
static const struct ethtool_ops velocity_ethtool_ops = {
.get_settings = velocity_get_settings,
.set_settings = velocity_set_settings,
@ -3208,6 +3364,8 @@ static const struct ethtool_ops velocity_ethtool_ops = {
.get_msglevel = velocity_get_msglevel,
.set_msglevel = velocity_set_msglevel,
.get_link = velocity_get_link,
.get_coalesce = velocity_get_coalesce,
.set_coalesce = velocity_set_coalesce,
.begin = velocity_ethtool_up,
.complete = velocity_ethtool_down
};

7
drivers/net/via-velocity.h
View File

@ -1005,7 +1005,8 @@ struct mac_regs {
volatile __le32 RDBaseLo; /* 0x38 */
volatile __le16 RDIdx; /* 0x3C */
volatile __le16 reserved_3E;
volatile u8 TQETMR; /* 0x3E, VT3216 and above only */
volatile u8 RQETMR; /* 0x3F, VT3216 and above only */
volatile __le32 TDBaseLo[4]; /* 0x40 */
@ -1491,6 +1492,10 @@ struct velocity_opt {
int rx_bandwidth_hi;
int rx_bandwidth_lo;
int rx_bandwidth_en;
int rxqueue_timer;
int txqueue_timer;
int tx_intsup;
int rx_intsup;
u32 flags;
};