/*
drivers/net/tulip/interrupt.c
- Maintained by Jeff Garzik <jgarzik@pobox.com>
+ Maintained by Valerie Henson <val_henson@linux.intel.com>
Copyright 2000,2001 The Linux Kernel Team
Written/copyright 1994-2001 by Donald Becker.
#include <linux/pci.h>
#include "tulip.h"
-#include <linux/config.h>
#include <linux/etherdevice.h>
int tulip_rx_copybreak;
}
/* Acknowledge current RX interrupt sources. */
iowrite32((RxIntr | RxNoBuf), tp->base_addr + CSR5);
-
-
+
+
/* If we own the next entry, it is a new packet. Send it up. */
while ( ! (tp->rx_ring[entry].status & cpu_to_le32(DescOwned))) {
s32 status = le32_to_cpu(tp->rx_ring[entry].status);
-
-
+
+
if (tp->dirty_rx + RX_RING_SIZE == tp->cur_rx)
break;
-
+
if (tulip_debug > 5)
printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %8.8x.\n",
dev->name, entry, status);
if (--rx_work_limit < 0)
goto not_done;
-
+
if ((status & 0x38008300) != 0x0300) {
if ((status & 0x38000300) != 0x0300) {
/* Ingore earlier buffers. */
/* Omit the four octet CRC from the length. */
short pkt_len = ((status >> 16) & 0x7ff) - 4;
struct sk_buff *skb;
-
+
#ifndef final_version
if (pkt_len > 1518) {
printk(KERN_WARNING "%s: Bogus packet size of %d (%#x).\n",
} else { /* Pass up the skb already on the Rx ring. */
char *temp = skb_put(skb = tp->rx_buffers[entry].skb,
pkt_len);
-
+
#ifndef final_version
if (tp->rx_buffers[entry].mapping !=
le32_to_cpu(tp->rx_ring[entry].buffer1)) {
skb->head, temp);
}
#endif
-
+
pci_unmap_single(tp->pdev, tp->rx_buffers[entry].mapping,
PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
-
+
tp->rx_buffers[entry].skb = NULL;
tp->rx_buffers[entry].mapping = 0;
}
skb->protocol = eth_type_trans(skb, dev);
-
+
netif_receive_skb(skb);
-
+
dev->last_rx = jiffies;
tp->stats.rx_packets++;
tp->stats.rx_bytes += pkt_len;
entry = (++tp->cur_rx) % RX_RING_SIZE;
if (tp->cur_rx - tp->dirty_rx > RX_RING_SIZE/4)
tulip_refill_rx(dev);
-
+
}
-
+
/* New ack strategy... irq does not ack Rx any longer
hopefully this helps */
-
+
/* Really bad things can happen here... If new packet arrives
* and an irq arrives (tx or just due to occasionally unset
* mask), it will be acked by irq handler, but new thread
* tomorrow (night 011029). If it will not fail, we won
* finally: amount of IO did not increase at all. */
} while ((ioread32(tp->base_addr + CSR5) & RxIntr));
-
+
done:
-
+
#ifdef CONFIG_TULIP_NAPI_HW_MITIGATION
-
+
/* We use this simplistic scheme for IM. It's proven by
real life installations. We can have IM enabled
- continuesly but this would cause unnecessary latency.
- Unfortunely we can't use all the NET_RX_* feedback here.
- This would turn on IM for devices that is not contributing
- to backlog congestion with unnecessary latency.
-
+ continuesly but this would cause unnecessary latency.
+ Unfortunely we can't use all the NET_RX_* feedback here.
+ This would turn on IM for devices that is not contributing
+ to backlog congestion with unnecessary latency.
+
We monitor the the device RX-ring and have:
-
+
HW Interrupt Mitigation either ON or OFF.
-
- ON: More then 1 pkt received (per intr.) OR we are dropping
+
+ ON: More then 1 pkt received (per intr.) OR we are dropping
OFF: Only 1 pkt received
-
+
Note. We only use min and max (0, 15) settings from mit_table */
-
-
+
+
if( tp->flags & HAS_INTR_MITIGATION) {
if( received > 1 ) {
if( ! tp->mit_on ) {
}
#endif /* CONFIG_TULIP_NAPI_HW_MITIGATION */
-
+
dev->quota -= received;
*budget -= received;
-
+
tulip_refill_rx(dev);
-
+
/* If RX ring is not full we are out of memory. */
if (tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL) goto oom;
-
+
/* Remove us from polling list and enable RX intr. */
-
+
netif_rx_complete(dev);
iowrite32(tulip_tbl[tp->chip_id].valid_intrs, tp->base_addr+CSR7);
-
+
/* The last op happens after poll completion. Which means the following:
* 1. it can race with disabling irqs in irq handler
* 2. it can race with dise/enabling irqs in other poll threads
* due to races in masking and due to too late acking of already
* processed irqs. But it must not result in losing events.
*/
-
+
return 0;
-
+
not_done:
if (!received) {
}
dev->quota -= received;
*budget -= received;
-
+
if (tp->cur_rx - tp->dirty_rx > RX_RING_SIZE/2 ||
tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL)
tulip_refill_rx(dev);
-
+
if (tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL) goto oom;
-
+
return 1;
-
-
+
+
oom: /* Executed with RX ints disabled */
-
-
+
+
/* Start timer, stop polling, but do not enable rx interrupts. */
mod_timer(&tp->oom_timer, jiffies+1);
-
+
/* Think: timer_pending() was an explicit signature of bug.
* Timer can be pending now but fired and completed
* before we did netif_rx_complete(). See? We would lose it. */
-
+
/* remove ourselves from the polling list */
netif_rx_complete(dev);
-
+
return 0;
}
/* The interrupt handler does all of the Rx thread work and cleans up
after the Tx thread. */
-irqreturn_t tulip_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
+irqreturn_t tulip_interrupt(int irq, void *dev_instance)
{
struct net_device *dev = (struct net_device *)dev_instance;
struct tulip_private *tp = netdev_priv(dev);
/* Let's see whether the interrupt really is for us */
csr5 = ioread32(ioaddr + CSR5);
- if (tp->flags & HAS_PHY_IRQ)
+ if (tp->flags & HAS_PHY_IRQ)
handled = phy_interrupt (dev);
-
+
if ((csr5 & (NormalIntr|AbnormalIntr)) == 0)
return IRQ_RETVAL(handled);
/* Mask RX intrs and add the device to poll list. */
iowrite32(tulip_tbl[tp->chip_id].valid_intrs&~RxPollInt, ioaddr + CSR7);
netif_rx_schedule(dev);
-
+
if (!(csr5&~(AbnormalIntr|NormalIntr|RxPollInt|TPLnkPass)))
break;
}
-
+
/* Acknowledge the interrupt sources we handle here ASAP
the poll function does Rx and RxNoBuf acking */
-
+
iowrite32(csr5 & 0x0001ff3f, ioaddr + CSR5);
-#else
+#else
/* Acknowledge all of the current interrupt sources ASAP. */
iowrite32(csr5 & 0x0001ffff, ioaddr + CSR5);
}
#endif /* CONFIG_TULIP_NAPI */
-
+
if (tulip_debug > 4)
printk(KERN_DEBUG "%s: interrupt csr5=%#8.8x new csr5=%#8.8x.\n",
dev->name, csr5, ioread32(ioaddr + CSR5));
-
+
if (csr5 & (TxNoBuf | TxDied | TxIntr | TimerInt)) {
unsigned int dirty_tx;
#ifdef CONFIG_TULIP_NAPI
if (rxd)
csr5 &= ~RxPollInt;
- } while ((csr5 & (TxNoBuf |
- TxDied |
- TxIntr |
+ } while ((csr5 & (TxNoBuf |
+ TxDied |
+ TxIntr |
TimerInt |
/* Abnormal intr. */
- RxDied |
- TxFIFOUnderflow |
- TxJabber |
- TPLnkFail |
+ RxDied |
+ TxFIFOUnderflow |
+ TxJabber |
+ TPLnkFail |
SytemError )) != 0);
-#else
+#else
} while ((csr5 & (NormalIntr|AbnormalIntr)) != 0);
tulip_refill_rx(dev);
git://git.onelab.eu / linux-2.6.git / blobdiff