+++ /dev/null
-/*
- * originally drivers/net/tulip/interrupt.c
- * Copyright 2000,2001 The Linux Kernel Team
- * Written/copyright 1994-2001 by Donald Becker.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include "net.h"
-
-int tulip_refill_rx(struct net_device *dev)
-{
- struct tulip_private *tp = netdev_priv(dev);
- int entry;
- int refilled = 0;
-
- /* Refill the Rx ring buffers. */
- for (; tp->cur_rx - tp->dirty_rx > 0; tp->dirty_rx++) {
- entry = tp->dirty_rx % RX_RING_SIZE;
- if (tp->rx_buffers[entry].skb == NULL) {
- struct sk_buff *skb;
- dma_addr_t mapping;
-
- skb = tp->rx_buffers[entry].skb = dev_alloc_skb(PKT_BUF_SZ);
- if (skb == NULL)
- break;
-
- mapping = dma_map_single(&dev->dev, skb->data,
- PKT_BUF_SZ, DMA_FROM_DEVICE);
- tp->rx_buffers[entry].mapping = mapping;
-
- skb->dev = dev; /* Mark as being used by this device. */
- tp->rx_ring[entry].buffer1 = cpu_to_le32(mapping);
- refilled++;
- }
- tp->rx_ring[entry].status = cpu_to_le32(DescOwned);
- }
- return refilled;
-}
-
-void oom_timer(unsigned long data)
-{
- struct net_device *dev = (struct net_device *)data;
- struct tulip_private *tp = netdev_priv(dev);
- napi_schedule(&tp->napi);
-}
-
-int tulip_poll(struct napi_struct *napi, int budget)
-{
- struct tulip_private *tp = container_of(napi, struct tulip_private, napi);
- struct net_device *dev = tp->dev;
- int entry = tp->cur_rx % RX_RING_SIZE;
- int work_done = 0;
-
- if (tulip_debug > 4)
- printk(KERN_DEBUG " In tulip_rx(), entry %d %08x\n",
- entry, tp->rx_ring[entry].status);
-
- do {
- if (ioread32(tp->base_addr + CSR5) == 0xffffffff) {
- printk(KERN_DEBUG " In tulip_poll(), hardware disappeared\n");
- break;
- }
- /* 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);
- short pkt_len;
-
- if (tp->dirty_rx + RX_RING_SIZE == tp->cur_rx)
- break;
-
- if (tulip_debug > 5)
- printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %08x\n",
- dev->name, entry, status);
-
- if (++work_done >= budget)
- goto not_done;
-
- /*
- * Omit the four octet CRC from the length.
- * (May not be considered valid until we have
- * checked status for RxLengthOver2047 bits)
- */
- pkt_len = ((status >> 16) & 0x7ff) - 4;
-
-#if 0
- csr6 = ioread32(tp->base_addr + CSR6);
- if (csr6 & 0x1)
- pkt_len += 2;
-
-#endif
- /*
- * Maximum pkt_len is 1518 (1514 + vlan header)
- * Anything higher than this is always invalid
- * regardless of RxLengthOver2047 bits
- */
-
- if ((status & (RxLengthOver2047 |
- RxDescCRCError |
- RxDescCollisionSeen |
- RxDescRunt |
- RxDescDescErr |
- RxWholePkt)) != RxWholePkt ||
- pkt_len > 1518) {
- if ((status & (RxLengthOver2047 |
- RxWholePkt)) != RxWholePkt) {
- /* Ingore earlier buffers. */
- if ((status & 0xffff) != 0x7fff) {
- if (tulip_debug > 1)
- dev_warn(&dev->dev,
- "Oversized Ethernet frame spanned multiple buffers, status %08x!\n",
- status);
- tp->stats.rx_length_errors++;
- }
- } else {
- /* There was a fatal error. */
- if (tulip_debug > 2)
- printk(KERN_DEBUG "%s: Receive error, Rx status %08x\n",
- dev->name, status);
- tp->stats.rx_errors++; /* end of a packet.*/
- if (pkt_len > 1518 ||
- (status & RxDescRunt))
- tp->stats.rx_length_errors++;
-
- if (status & 0x0004) tp->stats.rx_frame_errors++;
- if (status & 0x0002) tp->stats.rx_crc_errors++;
- if (status & 0x0001) tp->stats.rx_fifo_errors++;
- }
- } else {
- struct sk_buff *skb = tp->rx_buffers[entry].skb;
- char *temp = skb_put(skb, pkt_len);
-
-#if 0
- if (csr6 & 1)
- skb_pull(skb, 2);
-#endif
-#ifndef final_version
- if (tp->rx_buffers[entry].mapping !=
- le32_to_cpu(tp->rx_ring[entry].buffer1)) {
- dev_err(&dev->dev,
- "Internal fault: The skbuff addresses do not match in tulip_rx: %08x vs. %08llx %p / %p\n",
- le32_to_cpu(tp->rx_ring[entry].buffer1),
- (unsigned long long)tp->rx_buffers[entry].mapping,
- skb->head, temp);
- }
-#endif
-
- tp->rx_buffers[entry].skb = NULL;
- tp->rx_buffers[entry].mapping = 0;
- skb->protocol = eth_type_trans(skb, dev);
-
- netif_receive_skb(skb);
-
- 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
- * is not scheduled. It is major hole in design.
- * No idea how to fix this if "playing with fire" will fail
- * 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));
-
- 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. */
- napi_complete(napi);
- iowrite32(VALID_INTR, 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
- * 3. if an irq raised after beginning loop, it will be immediately
- * triggered here.
- *
- * Summarizing: the logic results in some redundant irqs both
- * due to races in masking and due to too late acking of already
- * processed irqs. But it must not result in losing events.
- */
-
- return work_done;
-
- not_done:
- 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 work_done;
-
- 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 napi_complete(). See? We would lose it. */
-
- /* remove ourselves from the polling list */
- napi_complete(napi);
-
- return work_done;
-}
-
-/* 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 net_device *dev = (struct net_device *)dev_instance;
- struct tulip_private *tp = netdev_priv(dev);
- void __iomem *ioaddr = tp->base_addr;
- int csr5;
- int missed;
- int rx = 0;
- int tx = 0;
- int oi = 0;
- int maxrx = RX_RING_SIZE;
- int maxtx = TX_RING_SIZE;
- int maxoi = TX_RING_SIZE;
- int rxd = 0;
- unsigned int work_count = 25;
- unsigned int handled = 0;
-
- /* Let's see whether the interrupt really is for us */
- csr5 = ioread32(ioaddr + CSR5);
-
- if ((csr5 & (NormalIntr|AbnormalIntr)) == 0)
- return IRQ_RETVAL(handled);
-
- tp->nir++;
-
- do {
-
- if (!rxd && (csr5 & (RxIntr | RxNoBuf))) {
- rxd++;
- /* Mask RX intrs and add the device to poll list. */
- iowrite32(VALID_INTR&~RxPollInt, ioaddr + CSR7);
- napi_schedule(&tp->napi);
-
- 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);
-
- 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;
-
- spin_lock(&tp->lock);
-
- for (dirty_tx = tp->dirty_tx; tp->cur_tx - dirty_tx > 0;
- dirty_tx++) {
- int entry = dirty_tx % TX_RING_SIZE;
- int status = le32_to_cpu(tp->tx_ring[entry].status);
-
- if (status < 0)
- break; /* It still has not been Txed */
-
- if (status & 0x8000) {
- /* There was an major error, log it. */
-#ifndef final_version
- if (tulip_debug > 1)
- printk(KERN_DEBUG "%s: Transmit error, Tx status %08x\n",
- dev->name, status);
-#endif
- tp->stats.tx_errors++;
- if (status & 0x4104) tp->stats.tx_aborted_errors++;
- if (status & 0x0C00) tp->stats.tx_carrier_errors++;
- if (status & 0x0200) tp->stats.tx_window_errors++;
- if (status & 0x0002) tp->stats.tx_fifo_errors++;
- if (status & 0x0080) tp->stats.tx_heartbeat_errors++;
- } else {
- tp->stats.tx_bytes +=
- tp->tx_buffers[entry].skb->len;
- tp->stats.collisions += (status >> 3) & 15;
- tp->stats.tx_packets++;
- }
-
- dma_unmap_single(&tp->pdev->dev, tp->tx_buffers[entry].mapping,
- tp->tx_buffers[entry].skb->len, DMA_TO_DEVICE);
- /* Free the original skb. */
- dev_kfree_skb_irq(tp->tx_buffers[entry].skb);
- tp->tx_buffers[entry].skb = NULL;
- tp->tx_buffers[entry].mapping = 0;
- tx++;
- }
-
-#ifndef final_version
- if (tp->cur_tx - dirty_tx > TX_RING_SIZE) {
- dev_err(&dev->dev,
- "Out-of-sync dirty pointer, %d vs. %d\n",
- dirty_tx, tp->cur_tx);
- dirty_tx += TX_RING_SIZE;
- }
-#endif
-
- if (tp->cur_tx - dirty_tx < TX_RING_SIZE - 2)
- netif_wake_queue(dev);
-
- tp->dirty_tx = dirty_tx;
- if (csr5 & TxDied) {
- if (tulip_debug > 2)
- dev_warn(&dev->dev,
- "The transmitter stopped. CSR5 is %x, CSR6 %x, new CSR6 %x\n",
- csr5, ioread32(ioaddr + CSR6),
- tp->csr6);
- tulip_restart_rxtx(tp);
- }
- spin_unlock(&tp->lock);
- }
-
- /* Log errors. */
- if (csr5 & AbnormalIntr) { /* Abnormal error summary bit. */
- if (csr5 == 0xffffffff)
- break;
- if (csr5 & TxJabber) tp->stats.tx_errors++;
- if (csr5 & TxFIFOUnderflow) {
- if ((tp->csr6 & 0xC000) != 0xC000)
- tp->csr6 += 0x4000; /* Bump up the Tx threshold */
- else
- tp->csr6 |= 0x00200000; /* Store-n-forward. */
- /* Restart the transmit process. */
- tulip_restart_rxtx(tp);
- iowrite32(0, ioaddr + CSR1);
- }
- if (csr5 & (RxDied | RxNoBuf)) {
- iowrite32(tp->mc_filter[0], ioaddr + CSR27);
- iowrite32(tp->mc_filter[1], ioaddr + CSR28);
- }
- if (csr5 & RxDied) { /* Missed a Rx frame. */
- tp->stats.rx_missed_errors += ioread32(ioaddr + CSR8) & 0xffff;
- tp->stats.rx_errors++;
- tulip_start_rxtx(tp);
- }
- /*
- * NB: t21142_lnk_change() does a del_timer_sync(), so be careful if this
- * call is ever done under the spinlock
- */
- if (csr5 & (TPLnkPass | TPLnkFail | 0x08000000)) {
- if (tp->link_change)
- (tp->link_change)(dev, csr5);
- }
- if (csr5 & SystemError) {
- int error = (csr5 >> 23) & 7;
- /* oops, we hit a PCI error. The code produced corresponds
- * to the reason:
- * 0 - parity error
- * 1 - master abort
- * 2 - target abort
- * Note that on parity error, we should do a software reset
- * of the chip to get it back into a sane state (according
- * to the 21142/3 docs that is).
- * -- rmk
- */
- dev_err(&dev->dev,
- "(%lu) System Error occurred (%d)\n",
- tp->nir, error);
- }
- /* Clear all error sources, included undocumented ones! */
- iowrite32(0x0800f7ba, ioaddr + CSR5);
- oi++;
- }
- if (csr5 & TimerInt) {
-
- if (tulip_debug > 2)
- dev_err(&dev->dev,
- "Re-enabling interrupts, %08x\n",
- csr5);
- iowrite32(VALID_INTR, ioaddr + CSR7);
- oi++;
- }
- if (tx > maxtx || rx > maxrx || oi > maxoi) {
- if (tulip_debug > 1)
- dev_warn(&dev->dev, "Too much work during an interrupt, csr5=0x%08x. (%lu) (%d,%d,%d)\n",
- csr5, tp->nir, tx, rx, oi);
-
- /* Acknowledge all interrupt sources. */
- iowrite32(0x8001ffff, ioaddr + CSR5);
- /* Mask all interrupting sources, set timer to
- re-enable. */
- iowrite32(((~csr5) & 0x0001ebef) | AbnormalIntr | TimerInt, ioaddr + CSR7);
- iowrite32(0x0012, ioaddr + CSR11);
- break;
- }
-
- work_count--;
- if (work_count == 0)
- break;
-
- csr5 = ioread32(ioaddr + CSR5);
-
- if (rxd)
- csr5 &= ~RxPollInt;
- } while ((csr5 & (TxNoBuf |
- TxDied |
- TxIntr |
- TimerInt |
- /* Abnormal intr. */
- RxDied |
- TxFIFOUnderflow |
- TxJabber |
- TPLnkFail |
- SystemError )) != 0);
-
- if ((missed = ioread32(ioaddr + CSR8) & 0x1ffff)) {
- tp->stats.rx_dropped += missed & 0x10000 ? 0x10000 : missed;
- }
-
- if (tulip_debug > 4)
- printk(KERN_DEBUG "%s: exiting interrupt, csr5=%#04x\n",
- dev->name, ioread32(ioaddr + CSR5));
-
- return IRQ_HANDLED;
-}
projects / openwrt / openwrt.git / blobdiff