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path: root/drivers/net/fec_mpc52xx.c
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Diffstat (limited to 'drivers/net/fec_mpc52xx.c')
-rw-r--r--drivers/net/fec_mpc52xx.c121
1 files changed, 62 insertions, 59 deletions
diff --git a/drivers/net/fec_mpc52xx.c b/drivers/net/fec_mpc52xx.c
index 6407672b28e9..848e8407ea8f 100644
--- a/drivers/net/fec_mpc52xx.c
+++ b/drivers/net/fec_mpc52xx.c
@@ -85,11 +85,15 @@ MODULE_PARM_DESC(debug, "debugging messages level");
static void mpc52xx_fec_tx_timeout(struct net_device *dev)
{
+ struct mpc52xx_fec_priv *priv = netdev_priv(dev);
+ unsigned long flags;
+
dev_warn(&dev->dev, "transmit timed out\n");
+ spin_lock_irqsave(&priv->lock, flags);
mpc52xx_fec_reset(dev);
-
dev->stats.tx_errors++;
+ spin_unlock_irqrestore(&priv->lock, flags);
netif_wake_queue(dev);
}
@@ -135,28 +139,32 @@ static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task
}
}
+static void
+mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
+{
+ struct mpc52xx_fec_priv *priv = netdev_priv(dev);
+ struct bcom_fec_bd *bd;
+
+ bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
+ bd->status = FEC_RX_BUFFER_SIZE;
+ bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
+ FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
+ bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
+}
+
static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
{
- while (!bcom_queue_full(rxtsk)) {
- struct sk_buff *skb;
- struct bcom_fec_bd *bd;
+ struct sk_buff *skb;
+ while (!bcom_queue_full(rxtsk)) {
skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
- if (skb == NULL)
+ if (!skb)
return -EAGAIN;
/* zero out the initial receive buffers to aid debugging */
memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
-
- bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
-
- bd->status = FEC_RX_BUFFER_SIZE;
- bd->skb_pa = dma_map_single(dev->dev.parent, skb->data,
- FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
-
- bcom_submit_next_buffer(rxtsk, skb);
+ mpc52xx_fec_rx_submit(dev, skb);
}
-
return 0;
}
@@ -328,13 +336,12 @@ static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
DMA_TO_DEVICE);
bcom_submit_next_buffer(priv->tx_dmatsk, skb);
+ spin_unlock_irqrestore(&priv->lock, flags);
if (bcom_queue_full(priv->tx_dmatsk)) {
netif_stop_queue(dev);
}
- spin_unlock_irqrestore(&priv->lock, flags);
-
return NETDEV_TX_OK;
}
@@ -359,9 +366,9 @@ static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
+ unsigned long flags;
- spin_lock(&priv->lock);
-
+ spin_lock_irqsave(&priv->lock, flags);
while (bcom_buffer_done(priv->tx_dmatsk)) {
struct sk_buff *skb;
struct bcom_fec_bd *bd;
@@ -372,11 +379,10 @@ static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
dev_kfree_skb_irq(skb);
}
+ spin_unlock_irqrestore(&priv->lock, flags);
netif_wake_queue(dev);
- spin_unlock(&priv->lock);
-
return IRQ_HANDLED;
}
@@ -384,67 +390,60 @@ static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
+ struct sk_buff *rskb; /* received sk_buff */
+ struct sk_buff *skb; /* new sk_buff to enqueue in its place */
+ struct bcom_fec_bd *bd;
+ u32 status, physaddr;
+ int length;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
while (bcom_buffer_done(priv->rx_dmatsk)) {
- struct sk_buff *skb;
- struct sk_buff *rskb;
- struct bcom_fec_bd *bd;
- u32 status;
rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
- (struct bcom_bd **)&bd);
- dma_unmap_single(dev->dev.parent, bd->skb_pa, rskb->len,
- DMA_FROM_DEVICE);
+ (struct bcom_bd **)&bd);
+ physaddr = bd->skb_pa;
/* Test for errors in received frame */
if (status & BCOM_FEC_RX_BD_ERRORS) {
/* Drop packet and reuse the buffer */
- bd = (struct bcom_fec_bd *)
- bcom_prepare_next_buffer(priv->rx_dmatsk);
-
- bd->status = FEC_RX_BUFFER_SIZE;
- bd->skb_pa = dma_map_single(dev->dev.parent,
- rskb->data,
- FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
-
- bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
-
+ mpc52xx_fec_rx_submit(dev, rskb);
dev->stats.rx_dropped++;
-
continue;
}
/* skbs are allocated on open, so now we allocate a new one,
* and remove the old (with the packet) */
skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
- if (skb) {
- /* Process the received skb */
- int length = status & BCOM_FEC_RX_BD_LEN_MASK;
-
- skb_put(rskb, length - 4); /* length without CRC32 */
-
- rskb->dev = dev;
- rskb->protocol = eth_type_trans(rskb, dev);
-
- netif_rx(rskb);
- } else {
+ if (!skb) {
/* Can't get a new one : reuse the same & drop pkt */
- dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
+ dev_notice(&dev->dev, "Low memory - dropped packet.\n");
+ mpc52xx_fec_rx_submit(dev, rskb);
dev->stats.rx_dropped++;
-
- skb = rskb;
+ continue;
}
- bd = (struct bcom_fec_bd *)
- bcom_prepare_next_buffer(priv->rx_dmatsk);
+ /* Enqueue the new sk_buff back on the hardware */
+ mpc52xx_fec_rx_submit(dev, skb);
- bd->status = FEC_RX_BUFFER_SIZE;
- bd->skb_pa = dma_map_single(dev->dev.parent, skb->data,
- FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
+ /* Process the received skb - Drop the spin lock while
+ * calling into the network stack */
+ spin_unlock_irqrestore(&priv->lock, flags);
- bcom_submit_next_buffer(priv->rx_dmatsk, skb);
+ dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
+ DMA_FROM_DEVICE);
+ length = status & BCOM_FEC_RX_BD_LEN_MASK;
+ skb_put(rskb, length - 4); /* length without CRC32 */
+ rskb->dev = dev;
+ rskb->protocol = eth_type_trans(rskb, dev);
+ netif_rx(rskb);
+
+ spin_lock_irqsave(&priv->lock, flags);
}
+ spin_unlock_irqrestore(&priv->lock, flags);
+
return IRQ_HANDLED;
}
@@ -454,6 +453,7 @@ static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
u32 ievent;
+ unsigned long flags;
ievent = in_be32(&fec->ievent);
@@ -471,9 +471,10 @@ static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
+ spin_lock_irqsave(&priv->lock, flags);
mpc52xx_fec_reset(dev);
+ spin_unlock_irqrestore(&priv->lock, flags);
- netif_wake_queue(dev);
return IRQ_HANDLED;
}
@@ -768,6 +769,8 @@ static void mpc52xx_fec_reset(struct net_device *dev)
bcom_enable(priv->tx_dmatsk);
mpc52xx_fec_start(dev);
+
+ netif_wake_queue(dev);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 08:55:34 +0000