--- /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 / svn-archive / archive.git / blobdiff