From 0b4465de66b82f742860a60fb92dca0d49ca3d70 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 20 Apr 2007 23:43:18 +0000 Subject: [PATCH] ar7-2.6: make cpmac robust against hardware quirks when the tx or rx dma ring runs over SVN-Revision: 7018 --- .../linux/ar7-2.6/files/drivers/net/cpmac.c | 105 +++++++++++++----- 1 file changed, 77 insertions(+), 28 deletions(-) diff --git a/target/linux/ar7-2.6/files/drivers/net/cpmac.c b/target/linux/ar7-2.6/files/drivers/net/cpmac.c index 9847a41ce9..a3862e5a1b 100644 --- a/target/linux/ar7-2.6/files/drivers/net/cpmac.c +++ b/target/linux/ar7-2.6/files/drivers/net/cpmac.c @@ -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; - dma_cache_inv((u32)desc, 16); + 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: -- 2.30.2