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ar7-2.6: make cpmac robust against hardware quirks when the tx or rx dma ring runs over

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SVN-Revision: 7018
This commit is contained in:
Felix Fietkau
2007-04-20 23:43:18 +00:00
parent 9cb1c0e1ef
commit 0b4465de66
1 changed files with 77 additions and 28 deletions
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103
target/linux/ar7-2.6/files/drivers/net/cpmac.c
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@@ -197,7 +197,7 @@ struct cpmac_priv {
spinlock_t lock;
struct sk_buff *skb_pool;
int free_skbs;
struct cpmac_desc *rx_head;
struct cpmac_desc *rx_head, *rx_tail;
int tx_head, tx_tail;
struct cpmac_desc *desc_ring;
struct cpmac_regs *regs;
@@ -209,9 +209,12 @@ struct cpmac_priv {
u32 msg_enable;
struct net_device *dev;
struct work_struct alloc_work;
struct work_struct reset_work;
};
static irqreturn_t cpmac_irq(int, void *);
static int cpmac_stop(struct net_device *dev);
static int cpmac_open(struct net_device *dev);
#define CPMAC_LOW_THRESH 8
#define CPMAC_ALLOC_SIZE 32
@@ -373,15 +376,18 @@ static void cpmac_rx(struct net_device *dev, int channel)
char *data;
struct sk_buff *skb;
struct cpmac_desc *desc;
struct cpmac_desc *start;
struct cpmac_priv *priv = netdev_priv(dev);
spin_lock(&priv->lock);
if (unlikely(!priv->rx_head))
return;
desc = priv->rx_head;
desc = priv->rx_tail->next;
dma_cache_inv((u32)desc, 16);
start = priv->rx_tail;
while((desc->dataflags & CPMAC_OWN) == 0) {
priv->regs->rx_ack[0] = virt_to_phys(desc);
if (unlikely(!desc->datalen)) {
@@ -407,19 +413,31 @@ static void cpmac_rx(struct net_device *dev, int channel)
if (printk_ratelimit())
printk(KERN_NOTICE "%s: rx: no free skbs, dropping packet\n",
dev->name);
priv->regs->rx_ptr[0] = virt_to_phys(desc);
priv->stats.rx_dropped++;
}
desc->hw_data = virt_to_phys(desc->skb->data);
desc->buflen = CPMAC_SKB_SIZE;
desc->dataflags = CPMAC_OWN;
desc->hw_next = 0;
dma_cache_wback((u32)desc, 16);
priv->rx_tail->hw_next = virt_to_phys(desc);
priv->rx_tail->dataflags = CPMAC_OWN;
dma_cache_wback((u32)priv->rx_tail, 16);
priv->rx_tail = desc;
desc = desc->next;
dma_cache_inv((u32)desc, 16);
if (start == desc) {
printk("Somebody set up us the bomb!!\n");
break;
}
}
out:
priv->rx_head = desc;
priv->regs->rx_ptr[0] = virt_to_phys(desc);
spin_unlock(&priv->lock);
priv->regs->rx_ptr[0] = virt_to_phys(priv->rx_head);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
@@ -493,6 +511,15 @@ static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
netif_stop_queue(dev);
desc = &priv->desc_ring[chan];
dma_cache_inv((u32)desc, 16);
if (desc->dataflags & CPMAC_OWN) {
printk(KERN_NOTICE "%s: tx dma ring full, dropping\n", dev->name);
spin_lock_irqsave(&priv->lock, flags);
priv->stats.tx_dropped++;
spin_unlock_irqrestore(&priv->lock, flags);
return -ENOMEM;
}
dev->trans_start = jiffies;
desc->jiffies = dev->trans_start;
spin_unlock_irqrestore(&priv->lock, flags);
@@ -529,9 +556,9 @@ static void cpmac_end_xmit(struct net_device *dev, int channel)
break;
desc = &priv->desc_ring[priv->tx_head];
}
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
}
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
} else {
if (printk_ratelimit())
printk(KERN_NOTICE "%s: end_xmit: spurious interrupt\n",
@@ -540,6 +567,40 @@ static void cpmac_end_xmit(struct net_device *dev, int channel)
spin_unlock(&priv->lock);
}
static void cpmac_reset(struct net_device *dev)
{
int i;
struct cpmac_priv *priv = netdev_priv(dev);
ar7_device_reset(priv->config->reset_bit);
priv->regs->rx_ctrl.control &= ~1;
priv->regs->tx_ctrl.control &= ~1;
for (i = 0; i < 8; i++) {
priv->regs->tx_ptr[i] = 0;
priv->regs->rx_ptr[i] = 0;
}
priv->regs->mac_control &= ~MAC_MII; /* disable mii */
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
static void
cpmac_full_reset(struct work_struct *work)
{
struct cpmac_priv *priv = container_of(work, struct cpmac_priv,
alloc_work);
struct net_device *dev = priv->dev;
#else
static void
cpmac_full_reset(void *data)
{
struct net_device *dev = (struct net_device*)data;
#endif
cpmac_stop(dev);
cpmac_open(dev);
}
static irqreturn_t cpmac_irq(int irq, void *dev_id)
{
struct net_device *dev = (struct net_device *)dev_id;
@@ -560,9 +621,11 @@ static irqreturn_t cpmac_irq(int irq, void *dev_id)
}
if (unlikely(status & INTST_HOST)) { /* host interrupt ??? */
printk("%s: host int, something bad happened...\n", dev->name);
printk("%s: mac status: 0x%08x\n", dev->name,
priv->regs->mac_status);
printk("%s: host int, something bad happened - mac status: 0x%08x\n", dev->name, priv->regs->mac_status);
/* try to recover */
cpmac_reset(dev);
schedule_work(&priv->reset_work);
}
if (unlikely(status & INTST_STATUS)) { /* status interrupt ??? */
@@ -665,21 +728,6 @@ static int cpmac_change_mtu(struct net_device *dev, int mtu)
return 0;
}
static void cpmac_reset(struct net_device *dev)
{
int i;
struct cpmac_priv *priv = netdev_priv(dev);
ar7_device_reset(priv->config->reset_bit);
priv->regs->rx_ctrl.control &= ~1;
priv->regs->tx_ctrl.control &= ~1;
for (i = 0; i < 8; i++) {
priv->regs->tx_ptr[i] = 0;
priv->regs->rx_ptr[i] = 0;
}
priv->regs->mac_control &= ~MAC_MII; /* disable mii */
}
static void cpmac_adjust_link(struct net_device *dev)
{
struct cpmac_priv *priv = netdev_priv(dev);
@@ -767,8 +815,10 @@ static int cpmac_open(struct net_device *dev)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs);
INIT_WORK(&priv->reset_work, cpmac_full_reset);
#else
INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs, dev);
INIT_WORK(&priv->reset_work, cpmac_full_reset, dev);
#endif
schedule_work(&priv->alloc_work);
flush_scheduled_work();
@@ -788,9 +838,9 @@ static int cpmac_open(struct net_device *dev)
desc->hw_next = virt_to_phys(desc->next);
dma_cache_wback((u32)desc, 16);
}
priv->rx_head[CPMAC_RX_RING_SIZE - 1].next = priv->rx_head;
priv->rx_head[CPMAC_RX_RING_SIZE - 1].hw_next =
virt_to_phys(priv->rx_head);
priv->rx_tail = &priv->rx_head[CPMAC_RX_RING_SIZE - 1];
priv->rx_tail->next = priv->rx_head;
priv->rx_tail->hw_next = 0;
cpmac_reset(dev);
for (i = 0; i < 8; i++)
@@ -828,7 +878,6 @@ static int cpmac_open(struct net_device *dev)
phy_start(priv->phy);
netif_start_queue(dev);
return 0;
fail_irq: