interrupt.c
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上传日期:2013-02-24
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- /*
- drivers/net/tulip/interrupt.c
- Maintained by Jeff Garzik <jgarzik@mandrakesoft.com>
- Copyright 2000,2001 The Linux Kernel Team
- Written/copyright 1994-2001 by Donald Becker.
- This software may be used and distributed according to the terms
- of the GNU General Public License, incorporated herein by reference.
- Please refer to Documentation/DocBook/tulip.{pdf,ps,html}
- for more information on this driver, or visit the project
- Web page at http://sourceforge.net/projects/tulip/
- */
- #include "tulip.h"
- #include <linux/config.h>
- #include <linux/etherdevice.h>
- #include <linux/pci.h>
- int tulip_rx_copybreak;
- unsigned int tulip_max_interrupt_work;
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- #define MIT_SIZE 15
- unsigned int mit_table[MIT_SIZE+1] =
- {
- /* CRS11 21143 hardware Mitigation Control Interrupt
- We use only RX mitigation we other techniques for
- TX intr. mitigation.
- 31 Cycle Size (timer control)
- 30:27 TX timer in 16 * Cycle size
- 26:24 TX No pkts before Int.
- 23:20 RX timer in Cycle size
- 19:17 RX No pkts before Int.
- 16 Continues Mode (CM)
- */
- 0x0, /* IM disabled */
- 0x80150000, /* RX time = 1, RX pkts = 2, CM = 1 */
- 0x80150000,
- 0x80270000,
- 0x80370000,
- 0x80490000,
- 0x80590000,
- 0x80690000,
- 0x807B0000,
- 0x808B0000,
- 0x809D0000,
- 0x80AD0000,
- 0x80BD0000,
- 0x80CF0000,
- 0x80DF0000,
- // 0x80FF0000 /* RX time = 16, RX pkts = 7, CM = 1 */
- 0x80F10000 /* RX time = 16, RX pkts = 0, CM = 1 */
- };
- #endif
- int tulip_refill_rx(struct net_device *dev)
- {
- struct tulip_private *tp = (struct tulip_private *)dev->priv;
- 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 = pci_map_single(tp->pdev, skb->tail, PKT_BUF_SZ,
- PCI_DMA_FROMDEVICE);
- 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);
- }
- if(tp->chip_id == LC82C168) {
- if(((inl(dev->base_addr + CSR5)>>17)&0x07) == 4) {
- /* Rx stopped due to out of buffers,
- * restart it
- */
- outl(0x01, dev->base_addr + CSR2);
- }
- }
- return refilled;
- }
- static int tulip_rx(struct net_device *dev)
- {
- struct tulip_private *tp = (struct tulip_private *)dev->priv;
- int entry = tp->cur_rx % RX_RING_SIZE;
- int rx_work_limit = tp->dirty_rx + RX_RING_SIZE - tp->cur_rx;
- int received = 0;
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- int drop = 0, mit_sel = 0;
- /* that one buffer is needed for mit activation; or might be a
- bug in the ring buffer code; check later -- JHS*/
- if (rx_work_limit >=RX_RING_SIZE) rx_work_limit--;
- #endif
- if (tulip_debug > 4)
- printk(KERN_DEBUG " In tulip_rx(), entry %d %8.8x.n", entry,
- tp->rx_ring[entry].status);
- /* 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 (tulip_debug > 5)
- printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %8.8x.n",
- dev->name, entry, status);
- if (--rx_work_limit < 0)
- break;
- if ((status & 0x38008300) != 0x0300) {
- if ((status & 0x38000300) != 0x0300) {
- /* Ingore earlier buffers. */
- if ((status & 0xffff) != 0x7fff) {
- if (tulip_debug > 1)
- printk(KERN_WARNING "%s: Oversized Ethernet frame "
- "spanned multiple buffers, status %8.8x!n",
- dev->name, status);
- tp->stats.rx_length_errors++;
- }
- } else if (status & RxDescFatalErr) {
- /* There was a fatal error. */
- if (tulip_debug > 2)
- printk(KERN_DEBUG "%s: Receive error, Rx status %8.8x.n",
- dev->name, status);
- tp->stats.rx_errors++; /* end of a packet.*/
- if (status & 0x0890) 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 {
- /* 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",
- dev->name, pkt_len, pkt_len);
- pkt_len = 1518;
- tp->stats.rx_length_errors++;
- }
- #endif
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- drop = atomic_read(&netdev_dropping);
- if (drop)
- goto throttle;
- #endif
- /* Check if the packet is long enough to accept without copying
- to a minimally-sized skbuff. */
- if (pkt_len < tulip_rx_copybreak
- && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
- skb->dev = dev;
- skb_reserve(skb, 2); /* 16 byte align the IP header */
- pci_dma_sync_single(tp->pdev,
- tp->rx_buffers[entry].mapping,
- pkt_len, PCI_DMA_FROMDEVICE);
- #if ! defined(__alpha__)
- eth_copy_and_sum(skb, tp->rx_buffers[entry].skb->tail,
- pkt_len, 0);
- skb_put(skb, pkt_len);
- #else
- memcpy(skb_put(skb, pkt_len),
- tp->rx_buffers[entry].skb->tail,
- pkt_len);
- #endif
- } 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)) {
- printk(KERN_ERR "%s: Internal fault: The skbuff addresses "
- "do not match in tulip_rx: %08x vs. %08x %p / %p.n",
- dev->name,
- le32_to_cpu(tp->rx_ring[entry].buffer1),
- tp->rx_buffers[entry].mapping,
- 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);
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- mit_sel =
- #endif
- netif_rx(skb);
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- switch (mit_sel) {
- case NET_RX_SUCCESS:
- case NET_RX_CN_LOW:
- case NET_RX_CN_MOD:
- break;
- case NET_RX_CN_HIGH:
- rx_work_limit -= NET_RX_CN_HIGH; /* additional*/
- break;
- case NET_RX_DROP:
- rx_work_limit = -1;
- break;
- default:
- printk("unknown feedback return code %dn", mit_sel);
- break;
- }
- drop = atomic_read(&netdev_dropping);
- if (drop) {
- throttle:
- rx_work_limit = -1;
- mit_sel = NET_RX_DROP;
- if (tp->fc_bit) {
- long ioaddr = dev->base_addr;
- /* disable Rx & RxNoBuf ints. */
- outl(tulip_tbl[tp->chip_id].valid_intrs&RX_A_NBF_STOP, ioaddr + CSR7);
- set_bit(tp->fc_bit, &netdev_fc_xoff);
- }
- }
- #endif
- dev->last_rx = jiffies;
- tp->stats.rx_packets++;
- tp->stats.rx_bytes += pkt_len;
- }
- received++;
- entry = (++tp->cur_rx) % RX_RING_SIZE;
- }
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- /* 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.
- 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
- 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 || mit_sel == NET_RX_DROP)
- && tp->mit_sel != 15 ) {
- tp->mit_sel = 15;
- tp->mit_change = 1; /* Force IM change */
- }
- if((received <= 1 && mit_sel != NET_RX_DROP) && tp->mit_sel != 0 ) {
- tp->mit_sel = 0;
- tp->mit_change = 1; /* Force IM change */
- }
- }
- return RX_RING_SIZE+1; /* maxrx+1 */
- #else
- return received;
- #endif
- }
- /* The interrupt handler does all of the Rx thread work and cleans up
- after the Tx thread. */
- void tulip_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
- {
- struct net_device *dev = (struct net_device *)dev_instance;
- struct tulip_private *tp = (struct tulip_private *)dev->priv;
- long ioaddr = dev->base_addr;
- int csr5;
- int entry;
- 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;
- unsigned int work_count = tulip_max_interrupt_work;
- /* Let's see whether the interrupt really is for us */
- csr5 = inl(ioaddr + CSR5);
- if ((csr5 & (NormalIntr|AbnormalIntr)) == 0)
- return;
- tp->nir++;
- do {
- /* Acknowledge all of the current interrupt sources ASAP. */
- outl(csr5 & 0x0001ffff, ioaddr + CSR5);
- if (tulip_debug > 4)
- printk(KERN_DEBUG "%s: interrupt csr5=%#8.8x new csr5=%#8.8x.n",
- dev->name, csr5, inl(dev->base_addr + CSR5));
- if (csr5 & (RxIntr | RxNoBuf)) {
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- if ((!tp->fc_bit) ||
- (!test_bit(tp->fc_bit, &netdev_fc_xoff)))
- #endif
- rx += tulip_rx(dev);
- tulip_refill_rx(dev);
- }
- 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 */
- /* Check for Rx filter setup frames. */
- if (tp->tx_buffers[entry].skb == NULL) {
- /* test because dummy frames not mapped */
- if (tp->tx_buffers[entry].mapping)
- pci_unmap_single(tp->pdev,
- tp->tx_buffers[entry].mapping,
- sizeof(tp->setup_frame),
- PCI_DMA_TODEVICE);
- continue;
- }
- 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 %8.8x.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->full_duplex == 0)
- 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++;
- }
- pci_unmap_single(tp->pdev, tp->tx_buffers[entry].mapping,
- tp->tx_buffers[entry].skb->len,
- PCI_DMA_TODEVICE);
- /* 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) {
- printk(KERN_ERR "%s: Out-of-sync dirty pointer, %d vs. %d.n",
- dev->name, 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)
- printk(KERN_WARNING "%s: The transmitter stopped."
- " CSR5 is %x, CSR6 %x, new CSR6 %x.n",
- dev->name, csr5, inl(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);
- outl(0, ioaddr + CSR1);
- }
- if (csr5 & (RxDied | RxNoBuf)) {
- if (tp->flags & COMET_MAC_ADDR) {
- outl(tp->mc_filter[0], ioaddr + 0xAC);
- outl(tp->mc_filter[1], ioaddr + 0xB0);
- }
- }
- if (csr5 & RxDied) { /* Missed a Rx frame. */
- tp->stats.rx_missed_errors += inl(ioaddr + CSR8) & 0xffff;
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- if (tp->fc_bit && !test_bit(tp->fc_bit, &netdev_fc_xoff)) {
- tp->stats.rx_errors++;
- tulip_start_rxtx(tp);
- }
- #else
- tp->stats.rx_errors++;
- tulip_start_rxtx(tp);
- #endif
- }
- /*
- * 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 & SytemError) {
- 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
- */
- printk(KERN_ERR "%s: (%lu) System Error occured (%d)n",
- dev->name, tp->nir, error);
- }
- /* Clear all error sources, included undocumented ones! */
- outl(0x0800f7ba, ioaddr + CSR5);
- oi++;
- }
- if (csr5 & TimerInt) {
- if (tulip_debug > 2)
- printk(KERN_ERR "%s: Re-enabling interrupts, %8.8x.n",
- dev->name, csr5);
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- if (tp->fc_bit && (test_bit(tp->fc_bit, &netdev_fc_xoff)))
- if (net_ratelimit()) printk("BUG!! enabling interupt when FC off (timerintr.) n");
- #endif
- outl(tulip_tbl[tp->chip_id].valid_intrs, ioaddr + CSR7);
- tp->ttimer = 0;
- oi++;
- }
- if (tx > maxtx || rx > maxrx || oi > maxoi) {
- if (tulip_debug > 1)
- printk(KERN_WARNING "%s: Too much work during an interrupt, "
- "csr5=0x%8.8x. (%lu) (%d,%d,%d)n", dev->name, csr5, tp->nir, tx, rx, oi);
- /* Acknowledge all interrupt sources. */
- outl(0x8001ffff, ioaddr + CSR5);
- if (tp->flags & HAS_INTR_MITIGATION) {
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- if(tp->mit_change) {
- outl(mit_table[tp->mit_sel], ioaddr + CSR11);
- tp->mit_change = 0;
- }
- #else
- /* Josip Loncaric at ICASE did extensive experimentation
- to develop a good interrupt mitigation setting.*/
- outl(0x8b240000, ioaddr + CSR11);
- #endif
- } else if (tp->chip_id == LC82C168) {
- /* the LC82C168 doesn't have a hw timer.*/
- outl(0x00, ioaddr + CSR7);
- mod_timer(&tp->timer, RUN_AT(HZ/50));
- } else {
- /* Mask all interrupting sources, set timer to
- re-enable. */
- #ifndef CONFIG_NET_HW_FLOWCONTROL
- outl(((~csr5) & 0x0001ebef) | AbnormalIntr | TimerInt, ioaddr + CSR7);
- outl(0x0012, ioaddr + CSR11);
- #endif
- }
- break;
- }
- work_count--;
- if (work_count == 0)
- break;
- csr5 = inl(ioaddr + CSR5);
- } while ((csr5 & (NormalIntr|AbnormalIntr)) != 0);
- tulip_refill_rx(dev);
- /* check if the card is in suspend mode */
- entry = tp->dirty_rx % RX_RING_SIZE;
- if (tp->rx_buffers[entry].skb == NULL) {
- if (tulip_debug > 1)
- printk(KERN_WARNING "%s: in rx suspend mode: (%lu) (tp->cur_rx = %u, ttimer = %d, rx = %d) go/stay in suspend moden", dev->name, tp->nir, tp->cur_rx, tp->ttimer, rx);
- if (tp->chip_id == LC82C168) {
- outl(0x00, ioaddr + CSR7);
- mod_timer(&tp->timer, RUN_AT(HZ/50));
- } else {
- if (tp->ttimer == 0 || (inl(ioaddr + CSR11) & 0xffff) == 0) {
- if (tulip_debug > 1)
- printk(KERN_WARNING "%s: in rx suspend mode: (%lu) set timern", dev->name, tp->nir);
- outl(tulip_tbl[tp->chip_id].valid_intrs | TimerInt,
- ioaddr + CSR7);
- outl(TimerInt, ioaddr + CSR5);
- outl(12, ioaddr + CSR11);
- tp->ttimer = 1;
- }
- }
- }
- if ((missed = inl(ioaddr + CSR8) & 0x1ffff)) {
- tp->stats.rx_dropped += missed & 0x10000 ? 0x10000 : missed;
- }
- if (tulip_debug > 4)
- printk(KERN_DEBUG "%s: exiting interrupt, csr5=%#4.4x.n",
- dev->name, inl(ioaddr + CSR5));
- }