[PATCH 2.6.18-rc1 1/2] dllink driver: porting v1.19 to linux2.6.18-rc1

From: Hayim Shaul
Date: Thu Sep 07 2006 - 04:58:40 EST

--- drivers/net/dl2k.c.orig 2006-09-07 10:33:00.000000000 +0300
+++ drivers/net/dl2k.c 2006-09-07 10:33:16.000000000 +0300
@@ -1,7 +1,8 @@
/* D-Link DL2000-based Gigabit Ethernet Adapter Linux driver */
/*
Copyright (c) 2001, 2002 by D-Link Corporation
- Written by Edward Peng.<edward_peng@xxxxxxxxxxxx>
+ Copyright (c) 2003 by Alpha Networks
+ Written by Edward Peng.<edward_peng@xxxxxxxxxxxxxxxxxxxx>
Created 03-May-2001, base on Linux' sundance.c.

This program is free software; you can redistribute it and/or modify
@@ -9,10 +10,54 @@
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
*/
+/*
+ Rev Date Description
+ ==========================================================================
+ 0.01 2001/05/03 Created DL2000-based linux driver
+ 0.02 2001/05/21 Added VLAN and hardware checksum support.
+ 1.00 2001/06/26 Added jumbo frame support.
+ 1.01 2001/08/21 Added two parameters, rx_coalesce and rx_timeout.
+ 1.02 2001/10/08 Supported fiber media.
+ Added flow control parameters.
+ 1.03 2001/10/12 Changed the default media to 1000mbps_fd for
+ the fiber devices.
+ 1.04 2001/11/08 Fixed Tx stopped when tx very busy.
+ 1.05 2001/11/22 Fixed Tx stopped when unidirectional tx busy.
+ 1.06 2001/12/13 Fixed disconnect bug at 10Mbps mode.
+ Fixed tx_full flag incorrect.
+ Added tx_coalesce paramter.
+ 1.07 2002/01/03 Fixed miscount of RX frame error.
+ 1.08 2002/01/17 Fixed the multicast bug.
+ 1.09 2002/03/07 Move rx-poll-now to re-fill loop.
+ Added rio_timer() to watch rx buffers.
+ 1.10 2002/04/16 Fixed miscount of carrier error.
+ 1.11 2002/05/23 Added ISR schedule scheme
+ Fixed miscount of rx frame error for DGE-550SX.
+ Fixed VLAN bug.
+ 1.12 2002/06/13 Lock tx_coalesce=1 on 10/100Mbps mode.
+ 1.13 2002/08/13 1. Fix disconnection (many tx:carrier/rx:frame
+ errs) with some mainboards.
+ 2. Use definition "DRV_NAME" "DRV_VERSION"
+ "DRV_RELDATE" for flexibility.
+ 1.14 2002/08/14 Support ethtool.
+ 1.15 2002/08/27 Changed the default media to Auto-Negotiation
+ for the fiber devices.
+ 1.16 2002/09/04 More power down time for fiber devices auto-
+ negotiation.
+ Fix disconnect bug after ifup and ifdown.
+ 1.17 2002/10/03 Fix RMON statistics overflow.
+ Always use I/O mapping to access eeprom,
+ avoid system freezing with some chipsets.
+ 1.18 2002/11/07 New tx scheme, adaptive tx_coalesce.
+ Remove tx_coalesce option.
+ 1.19 2003/12/16 Fix problem parsing the eeprom on big endian
+ systems. (philt@xxxxxxxxxxxxxxxx)
+ 1.19b 2006/07/01 made compile on kernel 2.6.15. (hayim@xxxxxxxxxxxx)

+*/
#define DRV_NAME "D-Link DL2000-based linux driver"
-#define DRV_VERSION "v1.18"
-#define DRV_RELDATE "2006/06/27"
+#define DRV_VERSION "v1.19b"
+#define DRV_RELDATE "2006/07/01"
#include "dl2k.h"
#include <linux/dma-mapping.h>

@@ -26,9 +71,8 @@
static int tx_flow=-1;
static int rx_flow=-1;
static int copy_thresh;
-static int rx_coalesce=10; /* Rx frame count each interrupt */
+static int rx_coalesce=0; /* Rx frame count each interrupt */
static int rx_timeout=200; /* Rx DMA wait time in 640ns increments */
-static int tx_coalesce=16; /* HW xmit count each TxDMAComplete */


MODULE_AUTHOR ("Edward Peng");
@@ -43,12 +87,11 @@
module_param(copy_thresh, int, 0);
module_param(rx_coalesce, int, 0); /* Rx frame count each interrupt */
module_param(rx_timeout, int, 0); /* Rx DMA wait time in 64ns increments */
-module_param(tx_coalesce, int, 0); /* HW xmit count each TxDMAComplete */


/* Enable the default interrupts */
#define DEFAULT_INTR (RxDMAComplete | HostError | IntRequested | TxDMAComplete| \
- UpdateStats | LinkEvent)
+ UpdateStats | LinkEvent|TxComplete)
#define EnableInt() \
writew(DEFAULT_INTR, ioaddr + IntEnable)

@@ -59,11 +102,13 @@
static void rio_timer (unsigned long data);
static void rio_tx_timeout (struct net_device *dev);
static void alloc_list (struct net_device *dev);
+static void tx_poll (unsigned long data);
static int start_xmit (struct sk_buff *skb, struct net_device *dev);
static irqreturn_t rio_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
-static void rio_free_tx (struct net_device *dev, int irq);
+static void rio_free_tx (struct net_device *dev);
static void tx_error (struct net_device *dev, int tx_status);
-static int receive_packet (struct net_device *dev);
+static void rx_poll (unsigned long data);
+static void refill_rx (struct net_device *dev);
static void rio_error (struct net_device *dev, int int_status);
static int change_mtu (struct net_device *dev, int new_mtu);
static void set_multicast (struct net_device *dev);
@@ -136,10 +181,11 @@
np->pdev = pdev;
spin_lock_init (&np->tx_lock);
spin_lock_init (&np->rx_lock);
+ tasklet_init(&np->tx_tasklet, tx_poll, (unsigned long) dev);
+ tasklet_init(&np->rx_tasklet, rx_poll, (unsigned long) dev);

/* Parse manual configuration */
np->an_enable = 1;
- np->tx_coalesce = 1;
if (card_idx < MAX_UNITS) {
if (media[card_idx] != NULL) {
np->an_enable = 0;
@@ -193,10 +239,6 @@
np->tx_flow = (tx_flow == 0) ? 0 : 1;
np->rx_flow = (rx_flow == 0) ? 0 : 1;

- if (tx_coalesce < 1)
- tx_coalesce = 1;
- else if (tx_coalesce > TX_RING_SIZE-1)
- tx_coalesce = TX_RING_SIZE - 1;
}
dev->open = &rio_open;
dev->hard_start_xmit = &start_xmit;
@@ -262,9 +304,6 @@
dev->name, np->name,
dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5], irq);
- if (tx_coalesce > 1)
- printk(KERN_INFO "tx_coalesce:\t%d packets\n",
- tx_coalesce);
if (np->coalesce)
printk(KERN_INFO "rx_coalesce:\t%d packets\n"
KERN_INFO "rx_timeout: \t%d ns\n",
@@ -335,8 +374,9 @@
#endif
/* Read eeprom */
for (i = 0; i < 128; i++) {
- ((u16 *) sromdata)[i] = le16_to_cpu (read_eeprom (ioaddr, i));
+ ((u16 *) sromdata)[i] = cpu_to_le16 (read_eeprom (ioaddr, i));
}
+ psrom->crc = le32_to_cpu(psrom->crc);
#ifdef MEM_MAPPING
ioaddr = dev->base_addr;
#endif
@@ -351,7 +391,7 @@
for (i = 0; i < 6; i++)
dev->dev_addr[i] = psrom->mac_addr[i];

- /* Parse Software Information Block */
+ /* Parse Software Infomation Block */
i = 0x30;
psib = (u8 *) sromdata;
do {
@@ -401,7 +441,7 @@
int i;
u16 macctrl;

- i = request_irq (dev->irq, &rio_interrupt, IRQF_SHARED, dev->name, dev);
+ i = request_irq (dev->irq, &rio_interrupt, SA_SHIRQ, dev->name, dev);
if (i)
return i;

@@ -434,9 +474,12 @@
writeb (0x30, ioaddr + RxDMABurstThresh);
writeb (0x30, ioaddr + RxDMAUrgentThresh);
writel (0x0007ffff, ioaddr + RmonStatMask);
+
/* clear statistics */
clear_stats (dev);

+ atomic_set(&np->tx_desc_lock, 0);
+
/* VLAN supported */
if (np->vlan) {
/* priority field in RxDMAIntCtrl */
@@ -521,17 +564,31 @@
np->timer.expires = jiffies + next_tick;
add_timer(&np->timer);
}
-
+
static void
rio_tx_timeout (struct net_device *dev)
{
+ struct netdev_private *np = dev->priv;
long ioaddr = dev->base_addr;

- printk (KERN_INFO "%s: Tx timed out (%4.4x), is buffer full?\n",
+ printk (KERN_INFO "%s: Tx timed out (%4.4x), "
+ "clean up tx queue to restart..\n",
dev->name, readl (ioaddr + TxStatus));
- rio_free_tx(dev, 0);
+ printk (KERN_INFO "%s: cur_tx=%lx cur_task=%lx old_tx=%lx "
+ "TFDListPtr=%08x tx_full=%d",
+ dev->name, np->cur_tx, np->cur_task, np->old_tx,
+ readl(ioaddr + TFDListPtr0),
+ netif_queue_stopped(dev));
+ writew(0, ioaddr + IntEnable);
+ writew(0, ioaddr + TFDListPtr0);
+ writew(0, ioaddr + TFDListPtr1);
+ tasklet_disable(&np->tx_tasklet);
+ rio_free_tx(dev);
dev->if_port = 0;
dev->trans_start = jiffies;
+ tasklet_enable(&np->tx_tasklet);
+ writew(DEFAULT_INTR, ioaddr + IntEnable);
+ return;
}

/* allocate and initialize Tx and Rx descriptors */
@@ -543,6 +600,7 @@

np->cur_rx = np->cur_tx = 0;
np->old_rx = np->old_tx = 0;
+ np->cur_task = 0;
np->rx_buf_sz = (dev->mtu <= 1500 ? PACKET_SIZE : dev->mtu + 32);

/* Initialize Tx descriptors, TFDListPtr leaves in start_xmit(). */
@@ -592,6 +650,31 @@
return;
}

+static void tx_poll (unsigned long data)
+{
+ struct net_device *dev = (struct net_device*) data;
+ struct netdev_private *np = dev->priv;
+ unsigned head = np->cur_task % TX_RING_SIZE;
+ struct netdev_desc *txdesc =
+ &np->tx_ring[(np->cur_tx + TX_RING_SIZE - 1) % TX_RING_SIZE];
+
+ /* Indicate the latest descriptor of tx ring */
+ txdesc->status |= cpu_to_le64 (TxDMAIndicate);
+
+ while ((np->cur_task + TX_RING_SIZE - np->cur_tx) % TX_RING_SIZE > 0) {
+ txdesc = &np->tx_ring[np->cur_task];
+ txdesc->status &= cpu_to_le64 (~TFDDone);
+ np->cur_task = (np->cur_task + 1) % TX_RING_SIZE;
+ }
+
+ if (readl (dev->base_addr + TFDListPtr0) == 0) {
+ writel (np->tx_ring_dma + head * sizeof (struct netdev_desc),
+ dev->base_addr + TFDListPtr0);
+ writel (0, dev->base_addr + TFDListPtr1);
+ }
+
+ return;
+}
static int
start_xmit (struct sk_buff *skb, struct net_device *dev)
{
@@ -630,35 +713,40 @@

/* DL2K bug: DMA fails to get next descriptor ptr in 10Mbps mode
* Work around: Always use 1 descriptor in 10Mbps mode */
- if (entry % np->tx_coalesce == 0 || np->speed == 10)
- txdesc->status = cpu_to_le64 (entry | tfc_vlan_tag |
+ if (np->speed == 10) {
+ /* Note the order! Stop queue before hardware processing
+ * this descriptor */
+ netif_stop_queue (dev);
+ txdesc->status = cpu_to_le64 (entry | tfc_vlan_tag |
WordAlignDisable |
- TxDMAIndicate |
+ TxDMAIndicate | TxComplete |
(1 << FragCountShift));
- else
- txdesc->status = cpu_to_le64 (entry | tfc_vlan_tag |
+ /* TxDMAPollNow */
+ writel(readl(ioaddr + DMACtrl) | 0x00001000, ioaddr + DMACtrl);
+ if (readl (dev->base_addr + TFDListPtr0) == 0) {
+ writel (np->tx_ring_dma +
+ entry * sizeof (struct netdev_desc),
+ dev->base_addr + TFDListPtr0);
+ writel (0, dev->base_addr + TFDListPtr1);
+ }
+ np->cur_tx = np->cur_task = (np->cur_tx + 1) % TX_RING_SIZE;
+ } else {
+ np->cur_tx = (np->cur_tx + 1) % TX_RING_SIZE;
+ mb();
+ txdesc->status = cpu_to_le64 (entry | tfc_vlan_tag | TFDDone |
WordAlignDisable |
(1 << FragCountShift));
-
- /* TxDMAPollNow */
- writel (readl (ioaddr + DMACtrl) | 0x00001000, ioaddr + DMACtrl);
- /* Schedule ISR */
- writel(10000, ioaddr + CountDown);
- np->cur_tx = (np->cur_tx + 1) % TX_RING_SIZE;
- if ((np->cur_tx - np->old_tx + TX_RING_SIZE) % TX_RING_SIZE
- < TX_QUEUE_LEN - 1 && np->speed != 10) {
- /* do nothing */
- } else if (!netif_queue_stopped(dev)) {
- netif_stop_queue (dev);
+ tasklet_schedule (&np->tx_tasklet);
+ /* Schedule ISR */
+ if ((np->cur_tx - np->old_tx + TX_RING_SIZE) % TX_RING_SIZE
+ < TX_QUEUE_LEN - 1) {
+ /* do nothing */
+ } else if (!netif_queue_stopped(dev)) {
+ netif_stop_queue (dev);
+ }
}

- /* The first TFDListPtr */
- if (readl (dev->base_addr + TFDListPtr0) == 0) {
- writel (np->tx_ring_dma + entry * sizeof (struct netdev_desc),
- dev->base_addr + TFDListPtr0);
- writel (0, dev->base_addr + TFDListPtr1);
- }
-
+
/* NETDEV WATCHDOG timer */
dev->trans_start = jiffies;
return 0;
@@ -684,16 +772,22 @@
break;
handled = 1;
/* Processing received packets */
- if (int_status & RxDMAComplete)
- receive_packet (dev);
+ if (int_status & RxDMAComplete) {
+ writew(DEFAULT_INTR & ~(RxDMAComplete | RxComplete),
+ ioaddr + IntEnable);
+ if (np->budget < 0) {
+ np->budget = RX_BUDGET;
+ }
+ tasklet_schedule (&np->rx_tasklet);
+ }
/* TxDMAComplete interrupt */
- if ((int_status & (TxDMAComplete|IntRequested))) {
+ if ((int_status & (TxDMAComplete|IntRequested|TxComplete))) {
int tx_status;
tx_status = readl (ioaddr + TxStatus);
if (tx_status & 0x01)
tx_error (dev, tx_status);
/* Free used tx skbuffs */
- rio_free_tx (dev, 1);
+ rio_free_tx (dev);
}

/* Handle uncommon events */
@@ -701,26 +795,28 @@
(HostError | LinkEvent | UpdateStats))
rio_error (dev, int_status);
}
- if (np->cur_tx != np->old_tx)
- writel (100, ioaddr + CountDown);
+ writel(5000, ioaddr + CountDown);
return IRQ_RETVAL(handled);
}

static void
-rio_free_tx (struct net_device *dev, int irq)
+rio_free_tx (struct net_device *dev)
{
struct netdev_private *np = netdev_priv(dev);
int entry = np->old_tx % TX_RING_SIZE;
- int tx_use = 0;
unsigned long flag = 0;
+ int irq = in_interrupt();
+
+ if (atomic_read(&np->tx_desc_lock))
+ return;
+ atomic_inc(&np->tx_desc_lock);

if (irq)
spin_lock(&np->tx_lock);
else
spin_lock_irqsave(&np->tx_lock, flag);
-
/* Free used tx skbuffs */
- while (entry != np->cur_tx) {
+ while (entry != np->cur_task) {
struct sk_buff *skb;

if (!(np->tx_ring[entry].status & TFDDone))
@@ -736,8 +832,8 @@

np->tx_skbuff[entry] = NULL;
entry = (entry + 1) % TX_RING_SIZE;
- tx_use++;
}
+
if (irq)
spin_unlock(&np->tx_lock);
else
@@ -746,12 +842,19 @@

/* If the ring is no longer full, clear tx_full and
call netif_wake_queue() */
-
- if (netif_queue_stopped(dev) &&
+ if (np->speed != 10) {
+ if (netif_queue_stopped(dev) &&
((np->cur_tx - np->old_tx + TX_RING_SIZE) % TX_RING_SIZE
- < TX_QUEUE_LEN - 1 || np->speed == 10)) {
+ < TX_QUEUE_LEN - 1)) {
netif_wake_queue (dev);
+ }
+ }
+ else {
+ if (netif_queue_stopped(dev) &&
+ np->cur_tx == np->old_tx)
+ netif_wake_queue(dev);
}
+ atomic_dec(&np->tx_desc_lock);
}

static void
@@ -782,7 +885,7 @@
break;
mdelay (1);
}
- rio_free_tx (dev, 1);
+ rio_free_tx (dev);
/* Reset TFDListPtr */
writel (np->tx_ring_dma +
np->old_tx * sizeof (struct netdev_desc),
@@ -816,28 +919,36 @@
writel (readw (dev->base_addr + MACCtrl) | TxEnable, ioaddr + MACCtrl);
}

-static int
-receive_packet (struct net_device *dev)
+static void rx_poll (unsigned long data)
{
- struct netdev_private *np = netdev_priv(dev);
+ struct net_device *dev = (struct net_device*) data;
+ struct netdev_private *np = (struct netdev_private *) dev->priv;
int entry = np->cur_rx % RX_RING_SIZE;
- int cnt = 30;
-
+ int cnt = np->budget;
+ long ioaddr = dev->base_addr;
+ int received = 0;
/* If RFDDone, FrameStart and FrameEnd set, there is a new packet in. */
while (1) {
struct netdev_desc *desc = &np->rx_ring[entry];
int pkt_len;
u64 frame_status;

- if (!(desc->status & RFDDone) ||
- !(desc->status & FrameStart) || !(desc->status & FrameEnd))
- break;
+ if (--cnt < 0) {
+ np->cur_rx = entry;
+ goto not_done;
+ }

/* Chip omits the CRC. */
pkt_len = le64_to_cpu (desc->status & 0xffff);
frame_status = le64_to_cpu (desc->status);
- if (--cnt < 0)
+
+ if (!(desc->status & RFDDone) ||
+ !(desc->status & FrameStart) || !(desc->status & FrameEnd))
break;
+
+
+ pci_dma_sync_single_for_device (np->pdev, desc->fraginfo, np->rx_buf_sz,
+ PCI_DMA_FROMDEVICE);
/* Update rx error statistics, drop packet. */
if (frame_status & RFS_Errors) {
np->stats.rx_errors++;
@@ -891,9 +1002,37 @@
dev->last_rx = jiffies;
}
entry = (entry + 1) % RX_RING_SIZE;
+ received++;
}
- spin_lock(&np->rx_lock);
np->cur_rx = entry;
+ refill_rx (dev);
+ np->budget -= received;
+ writew (DEFAULT_INTR, ioaddr + IntEnable);
+ return;
+
+not_done:
+ refill_rx (dev);
+ if (!received)
+ received = 1;
+ np->budget -= received;
+ if (np->budget <= 0)
+ np->budget = RX_BUDGET;
+ tasklet_schedule (&np->rx_tasklet);
+ return;
+}
+
+static void refill_rx (struct net_device *dev)
+{
+ struct netdev_private *np = dev->priv;
+ int entry;
+ int irq = in_interrupt();
+ unsigned long flag = 0;
+
+ if (irq)
+ spin_lock(&np->rx_lock);
+ else
+ spin_lock_irqsave(&np->rx_lock, flag);
+
/* Re-allocate skbuffs to fill the descriptor ring */
entry = np->old_rx;
while (entry != np->cur_rx) {
@@ -924,8 +1063,12 @@
entry = (entry + 1) % RX_RING_SIZE;
}
np->old_rx = entry;
- spin_unlock(&np->rx_lock);
- return 0;
+
+ if (irq)
+ spin_unlock(&np->rx_lock);
+ else
+ spin_unlock_irqrestore(&np->rx_lock, flag);
+ return;
}

static void
@@ -943,10 +1086,6 @@
mii_get_media_pcs (dev);
else
mii_get_media (dev);
- if (np->speed == 1000)
- np->tx_coalesce = tx_coalesce;
- else
- np->tx_coalesce = 1;
macctrl = 0;
macctrl |= (np->vlan) ? AutoVLANuntagging : 0;
macctrl |= (np->full_duplex) ? DuplexSelect : 0;
@@ -984,10 +1123,10 @@
{
long ioaddr = dev->base_addr;
struct netdev_private *np = netdev_priv(dev);
+ unsigned int stat_reg;
#ifdef MEM_MAPPING
int i;
#endif
- unsigned int stat_reg;

/* All statistics registers need to be acknowledged,
else statistic overflow could cause problems */
@@ -1028,7 +1167,6 @@
readw (ioaddr + BcstFramesXmtdOk);
readw (ioaddr + MacControlFramesXmtd);
readw (ioaddr + FramesWEXDeferal);
-
#ifdef MEM_MAPPING
for (i = 0x100; i <= 0x150; i += 4)
readl (ioaddr + i);
@@ -1047,7 +1185,7 @@
long ioaddr = dev->base_addr;
#ifdef MEM_MAPPING
int i;
-#endif
+#endif

/* All statistics registers need to be acknowledged,
else statistic overflow could cause problems */
@@ -1086,7 +1224,7 @@
#ifdef MEM_MAPPING
for (i = 0x100; i <= 0x150; i += 4)
readl (ioaddr + i);
-#endif
+#endif
readw (ioaddr + TxJumboFrames);
readw (ioaddr + RxJumboFrames);
readw (ioaddr + TCPCheckSumErrors);
@@ -1752,6 +1890,8 @@
/* Stop Tx and Rx logics */
writel (TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl);
synchronize_irq (dev->irq);
+ tasklet_kill (&np->tx_tasklet);
+ tasklet_kill (&np->rx_tasklet);
free_irq (dev->irq, dev);
del_timer_sync (&np->timer);


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