| /* |
| 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 %d\n", 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 mode\n", 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 timer\n", 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)); |
| |
| } |
