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via-velocity: Implement NAPI support

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This patch adds NAPI support for VIA velocity. The new velocity_poll
function also pairs tx/rx handling twice which improves perforamance on
some workloads (e.g., netperf UDP_STREAM) significantly (that part is
from the VIA driver).

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 22:10:26 +00:00 committed by David S. Miller
parent 6dfc4b95b2
commit dfff7144b1
2 changed files with 49 additions and 35 deletions
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81
drivers/net/via-velocity.c
View file

@ -354,12 +354,6 @@ VELOCITY_PARAM(ValPktLen, "Receiving or Drop invalid 802.3 frame");
*/
VELOCITY_PARAM(wol_opts, "Wake On Lan options");
#define INT_WORKS_DEF 20
#define INT_WORKS_MIN 10
#define INT_WORKS_MAX 64
VELOCITY_PARAM(int_works, "Number of packets per interrupt services");
static int rx_copybreak = 200;
module_param(rx_copybreak, int, 0644);
MODULE_PARM_DESC(rx_copybreak, "Copy breakpoint for copy-only-tiny-frames");
@ -503,7 +497,6 @@ static void __devinit velocity_get_options(struct velocity_opt *opts, int index,
velocity_set_bool_opt(&opts->flags, ValPktLen[index], VAL_PKT_LEN_DEF, VELOCITY_FLAGS_VAL_PKT_LEN, "ValPktLen", devname);
velocity_set_int_opt((int *) &opts->spd_dpx, speed_duplex[index], MED_LNK_MIN, MED_LNK_MAX, MED_LNK_DEF, "Media link mode", devname);
velocity_set_int_opt((int *) &opts->wol_opts, wol_opts[index], WOL_OPT_MIN, WOL_OPT_MAX, WOL_OPT_DEF, "Wake On Lan options", devname);
velocity_set_int_opt((int *) &opts->int_works, int_works[index], INT_WORKS_MIN, INT_WORKS_MAX, INT_WORKS_DEF, "Interrupt service works", devname);
opts->numrx = (opts->numrx & ~3);
}
@ -2109,13 +2102,14 @@ static int velocity_receive_frame(struct velocity_info *vptr, int idx)
* any received packets from the receive queue. Hand the ring
* slots back to the adapter for reuse.
*/
static int velocity_rx_srv(struct velocity_info *vptr, int status)
static int velocity_rx_srv(struct velocity_info *vptr, int status,
int budget_left)
{
struct net_device_stats *stats = &vptr->dev->stats;
int rd_curr = vptr->rx.curr;
int works = 0;
do {
while (works < budget_left) {
struct rx_desc *rd = vptr->rx.ring + rd_curr;
if (!vptr->rx.info[rd_curr].skb)
@ -2146,7 +2140,8 @@ static int velocity_rx_srv(struct velocity_info *vptr, int status)
rd_curr++;
if (rd_curr >= vptr->options.numrx)
rd_curr = 0;
} while (++works <= 15);
works++;
}
vptr->rx.curr = rd_curr;
@ -2157,6 +2152,40 @@ static int velocity_rx_srv(struct velocity_info *vptr, int status)
return works;
}
static int velocity_poll(struct napi_struct *napi, int budget)
{
struct velocity_info *vptr = container_of(napi,
struct velocity_info, napi);
unsigned int rx_done;
u32 isr_status;
spin_lock(&vptr->lock);
isr_status = mac_read_isr(vptr->mac_regs);
/* Ack the interrupt */
mac_write_isr(vptr->mac_regs, isr_status);
if (isr_status & (~(ISR_PRXI | ISR_PPRXI | ISR_PTXI | ISR_PPTXI)))
velocity_error(vptr, isr_status);
/*
* Do rx and tx twice for performance (taken from the VIA
* out-of-tree driver).
*/
rx_done = velocity_rx_srv(vptr, isr_status, budget / 2);
velocity_tx_srv(vptr, isr_status);
rx_done += velocity_rx_srv(vptr, isr_status, budget - rx_done);
velocity_tx_srv(vptr, isr_status);
spin_unlock(&vptr->lock);
/* If budget not fully consumed, exit the polling mode */
if (rx_done < budget) {
napi_complete(napi);
mac_enable_int(vptr->mac_regs);
}
return rx_done;
}
/**
* velocity_intr - interrupt callback
@ -2173,8 +2202,6 @@ static irqreturn_t velocity_intr(int irq, void *dev_instance)
struct net_device *dev = dev_instance;
struct velocity_info *vptr = netdev_priv(dev);
u32 isr_status;
int max_count = 0;
spin_lock(&vptr->lock);
isr_status = mac_read_isr(vptr->mac_regs);
@ -2185,32 +2212,13 @@ static irqreturn_t velocity_intr(int irq, void *dev_instance)
return IRQ_NONE;
}
mac_disable_int(vptr->mac_regs);
/*
* Keep processing the ISR until we have completed
* processing and the isr_status becomes zero
*/
while (isr_status != 0) {
mac_write_isr(vptr->mac_regs, isr_status);
if (isr_status & (~(ISR_PRXI | ISR_PPRXI | ISR_PTXI | ISR_PPTXI)))
velocity_error(vptr, isr_status);
if (isr_status & (ISR_PRXI | ISR_PPRXI))
max_count += velocity_rx_srv(vptr, isr_status);
if (isr_status & (ISR_PTXI | ISR_PPTXI))
max_count += velocity_tx_srv(vptr, isr_status);
isr_status = mac_read_isr(vptr->mac_regs);
if (max_count > vptr->options.int_works) {
printk(KERN_WARNING "%s: excessive work at interrupt.\n",
dev->name);
max_count = 0;
}
if (likely(napi_schedule_prep(&vptr->napi))) {
mac_disable_int(vptr->mac_regs);
__napi_schedule(&vptr->napi);
}
spin_unlock(&vptr->lock);
mac_enable_int(vptr->mac_regs);
return IRQ_HANDLED;
return IRQ_HANDLED;
}
/**
@ -2250,6 +2258,7 @@ static int velocity_open(struct net_device *dev)
mac_enable_int(vptr->mac_regs);
netif_start_queue(dev);
napi_enable(&vptr->napi);
vptr->flags |= VELOCITY_FLAGS_OPENED;
out:
return ret;
@ -2485,6 +2494,7 @@ static int velocity_close(struct net_device *dev)
{
struct velocity_info *vptr = netdev_priv(dev);
napi_disable(&vptr->napi);
netif_stop_queue(dev);
velocity_shutdown(vptr);
@ -2803,6 +2813,7 @@ static int __devinit velocity_found1(struct pci_dev *pdev, const struct pci_devi
dev->irq = pdev->irq;
dev->netdev_ops = &velocity_netdev_ops;
dev->ethtool_ops = &velocity_ethtool_ops;
netif_napi_add(dev, &vptr->napi, velocity_poll, VELOCITY_NAPI_WEIGHT);
dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_FILTER |
NETIF_F_HW_VLAN_RX;

3
drivers/net/via-velocity.h
View file

@ -32,6 +32,7 @@
#define VELOCITY_VERSION "1.14"
#define VELOCITY_IO_SIZE 256
#define VELOCITY_NAPI_WEIGHT 64
#define PKT_BUF_SZ 1540
@ -1562,6 +1563,8 @@ struct velocity_info {
u32 ticks;
u8 rev_id;
struct napi_struct napi;
};
/**