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Date: Fri, 20 Nov 2015 00:50:50 +0100
From: Francois Romieu <romieu@...zoreil.com>
To: Grant Grundler <grantgrundler@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>,
Will Deacon <will.deacon@....com>,
Arnd Bergmann <arnd@...db.de>,
"open list:TULIP NETWORK DRI..." <netdev@...r.kernel.org>,
David Miller <davem@...emloft.net>, ard.biesheuvel@...aro.org,
Grant Grundler <grundler@...isc-linux.org>
Subject: Re: [PATCH] net: tulip: turn compile-time warning into dev_warn()
Grant Grundler <grantgrundler@...il.com> :
[...]
> Some additional minor refactoring of the code could convert this into
> a "multi-bus driver" if there is any system that could incorporate
> both a platform device and a PCI device.
>
> I expect the conversion to DMA API to be straight forward as the next
> patch shows:
You may change your mind once error checking is factored in.
Uncompiled stuff below includes a remaining WTF I am no too sure about
but it should be closer to what is needed.
diff --git a/drivers/net/ethernet/dec/tulip/tulip_core.c b/drivers/net/ethernet/dec/tulip/tulip_core.c
index ed41559..0e18b5d9 100644
--- a/drivers/net/ethernet/dec/tulip/tulip_core.c
+++ b/drivers/net/ethernet/dec/tulip/tulip_core.c
@@ -263,7 +263,6 @@ static netdev_tx_t tulip_start_xmit(struct sk_buff *skb,
struct net_device *dev);
static int tulip_open(struct net_device *dev);
static int tulip_close(struct net_device *dev);
-static void tulip_up(struct net_device *dev);
static void tulip_down(struct net_device *dev);
static struct net_device_stats *tulip_get_stats(struct net_device *dev);
static int private_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
@@ -291,7 +290,7 @@ static void tulip_set_power_state (struct tulip_private *tp,
}
-static void tulip_up(struct net_device *dev)
+static int tulip_up(struct net_device *dev)
{
struct tulip_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->base_addr;
@@ -299,10 +298,6 @@ static void tulip_up(struct net_device *dev)
u32 reg;
int i;
-#ifdef CONFIG_TULIP_NAPI
- napi_enable(&tp->napi);
-#endif
-
/* Wake the chip from sleep/snooze mode. */
tulip_set_power_state (tp, 0, 0);
@@ -353,6 +348,7 @@ static void tulip_up(struct net_device *dev)
/* This is set_rx_mode(), but without starting the transmitter. */
u16 *eaddrs = (u16 *)dev->dev_addr;
u16 *setup_frm = &tp->setup_frame[15*6];
+ struct device *d = &tp->pdev->dev;
dma_addr_t mapping;
/* 21140 bug: you must add the broadcast address. */
@@ -362,9 +358,12 @@ static void tulip_up(struct net_device *dev)
*setup_frm++ = eaddrs[1]; *setup_frm++ = eaddrs[1];
*setup_frm++ = eaddrs[2]; *setup_frm++ = eaddrs[2];
- mapping = pci_map_single(tp->pdev, tp->setup_frame,
- sizeof(tp->setup_frame),
- PCI_DMA_TODEVICE);
+ mapping = dma_map_single(d, tp->setup_frame,
+ sizeof(tp->setup_frame), DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(d, mapping))) {
+ tulip_set_power_state(tp, 0, 1);
+ return -EIO;
+ }
tp->tx_buffers[tp->cur_tx].skb = NULL;
tp->tx_buffers[tp->cur_tx].mapping = mapping;
@@ -376,6 +375,10 @@ static void tulip_up(struct net_device *dev)
tp->cur_tx++;
}
+#ifdef CONFIG_TULIP_NAPI
+ napi_enable(&tp->napi);
+#endif
+
tp->saved_if_port = dev->if_port;
if (dev->if_port == 0)
dev->if_port = tp->default_port;
@@ -516,24 +519,30 @@ static int
tulip_open(struct net_device *dev)
{
struct tulip_private *tp = netdev_priv(dev);
- int retval;
+ int irq = tp->pdev->irq;
+ int rc;
- tulip_init_ring (dev);
+ rc = tulip_init_ring(dev);
+ if (rc < 0)
+ goto out;
- retval = request_irq(tp->pdev->irq, tulip_interrupt, IRQF_SHARED,
- dev->name, dev);
- if (retval)
- goto free_ring;
+ rc = request_irq(irq, tulip_interrupt, IRQF_SHARED, dev->name, dev);
+ if (rc < 0)
+ goto free_ring_0;
- tulip_up (dev);
+ rc = tulip_up(dev);
+ if (rc < 0)
+ goto free_irq_1;
netif_start_queue (dev);
+out:
+ return rc;
- return 0;
-
-free_ring:
- tulip_free_ring (dev);
- return retval;
+free_irq_1:
+ free_irq(irq, dev);
+free_ring_0:
+ tulip_free_ring(dev);
+ return rc;
}
@@ -614,9 +623,11 @@ out_unlock:
/* Initialize the Rx and Tx rings, along with various 'dev' bits. */
-static void tulip_init_ring(struct net_device *dev)
+static int tulip_init_ring(struct net_device *dev)
{
struct tulip_private *tp = netdev_priv(dev);
+ struct device *d = &tp->pdev->dev;
+ int rc;
int i;
tp->susp_rx = 0;
@@ -642,10 +653,17 @@ static void tulip_init_ring(struct net_device *dev)
use skb_reserve() to align the IP header! */
struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
tp->rx_buffers[i].skb = skb;
- if (skb == NULL)
- break;
- mapping = pci_map_single(tp->pdev, skb->data,
- PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
+ if (!skb) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+ mapping = dma_map_single(d, skb->data, PKT_BUF_SZ,
+ DMA_FROM_DEVICE);
+ if (unlikely(dma_mapping_error(d, mapping))) {
+ rc = -EIO;
+ dev_kfree_skb(skb);
+ goto err_out;
+ }
tp->rx_buffers[i].mapping = mapping;
tp->rx_ring[i].status = cpu_to_le32(DescOwned); /* Owned by Tulip chip */
tp->rx_ring[i].buffer1 = cpu_to_le32(mapping);
@@ -661,12 +679,24 @@ static void tulip_init_ring(struct net_device *dev)
tp->tx_ring[i].buffer2 = cpu_to_le32(tp->tx_ring_dma + sizeof(struct tulip_tx_desc) * (i + 1));
}
tp->tx_ring[i-1].buffer2 = cpu_to_le32(tp->tx_ring_dma);
+
+ return 0;
+
+err_out:
+ while (--i) {
+ struct ring_info *info = tp->rx_buffers + i;
+
+ dma_unmap_single(d, info->mapping, PKT_BUF_SZ, DMA_FROM_DEVICE);
+ dev_kfree_skb(info->skb);
+ }
+ return rc;
}
static netdev_tx_t
tulip_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct tulip_private *tp = netdev_priv(dev);
+ struct device *d = &tp->pdev->dev;
int entry;
u32 flag;
dma_addr_t mapping;
@@ -678,8 +708,14 @@ tulip_start_xmit(struct sk_buff *skb, struct net_device *dev)
entry = tp->cur_tx % TX_RING_SIZE;
tp->tx_buffers[entry].skb = skb;
- mapping = pci_map_single(tp->pdev, skb->data,
- skb->len, PCI_DMA_TODEVICE);
+
+ mapping = dma_map_single(d, skb->data, skb->len, DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(d, mapping))) {
+ dev->stats.tx_dropped++;
+ dev_kfree_skb_any(skb);
+ goto out_unlock;
+ }
+
tp->tx_buffers[entry].mapping = mapping;
tp->tx_ring[entry].buffer1 = cpu_to_le32(mapping);
@@ -707,6 +743,7 @@ tulip_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Trigger an immediate transmit demand. */
iowrite32(0, tp->base_addr + CSR1);
+out_unlock:
spin_unlock_irqrestore(&tp->lock, flags);
return NETDEV_TX_OK;
@@ -714,6 +751,7 @@ tulip_start_xmit(struct sk_buff *skb, struct net_device *dev)
static void tulip_clean_tx_ring(struct tulip_private *tp)
{
+ struct device *d = &tp->pdev->dev;
unsigned int dirty_tx;
for (dirty_tx = tp->dirty_tx ; tp->cur_tx - dirty_tx > 0;
@@ -730,16 +768,15 @@ static void tulip_clean_tx_ring(struct tulip_private *tp)
if (tp->tx_buffers[entry].skb == NULL) {
/* test because dummy frames not mapped */
if (tp->tx_buffers[entry].mapping)
- pci_unmap_single(tp->pdev,
+ dma_unmap_single(d,
tp->tx_buffers[entry].mapping,
sizeof(tp->setup_frame),
- PCI_DMA_TODEVICE);
+ DMA_TO_DEVICE);
continue;
}
- pci_unmap_single(tp->pdev, tp->tx_buffers[entry].mapping,
- tp->tx_buffers[entry].skb->len,
- PCI_DMA_TODEVICE);
+ dma_unmap_single(d, tp->tx_buffers[entry].mapping,
+ tp->tx_buffers[entry].skb->len, DMA_TO_DEVICE);
/* Free the original skb. */
dev_kfree_skb_irq(tp->tx_buffers[entry].skb);
@@ -796,6 +833,7 @@ static void tulip_down (struct net_device *dev)
static void tulip_free_ring (struct net_device *dev)
{
struct tulip_private *tp = netdev_priv(dev);
+ struct device *d = &tp->pdev->dev;
int i;
/* Free all the skbuffs in the Rx queue. */
@@ -811,8 +849,7 @@ static void tulip_free_ring (struct net_device *dev)
/* An invalid address. */
tp->rx_ring[i].buffer1 = cpu_to_le32(0xBADF00D0);
if (skb) {
- pci_unmap_single(tp->pdev, mapping, PKT_BUF_SZ,
- PCI_DMA_FROMDEVICE);
+ dma_unmap_single(d, mapping, PKT_BUF_SZ, DMA_FROM_DEVICE);
dev_kfree_skb (skb);
}
}
@@ -821,8 +858,8 @@ static void tulip_free_ring (struct net_device *dev)
struct sk_buff *skb = tp->tx_buffers[i].skb;
if (skb != NULL) {
- pci_unmap_single(tp->pdev, tp->tx_buffers[i].mapping,
- skb->len, PCI_DMA_TODEVICE);
+ dma_unmap_single(d, tp->tx_buffers[i].mapping, skb->len,
+ DMA_TO_DEVICE);
dev_kfree_skb (skb);
}
tp->tx_buffers[i].skb = NULL;
@@ -1143,7 +1180,9 @@ static void set_rx_mode(struct net_device *dev)
if (tp->cur_tx - tp->dirty_tx > TX_RING_SIZE - 2) {
/* Same setup recently queued, we need not add it. */
} else {
+ struct device *d = &tp->pdev->dev;
unsigned int entry;
+ dma_addr_t mapping;
int dummy = -1;
/* Now add this frame to the Tx list. */
@@ -1164,16 +1203,18 @@ static void set_rx_mode(struct net_device *dev)
}
tp->tx_buffers[entry].skb = NULL;
- tp->tx_buffers[entry].mapping =
- pci_map_single(tp->pdev, tp->setup_frame,
- sizeof(tp->setup_frame),
- PCI_DMA_TODEVICE);
+ mapping = dma_map_single(d, tp->setup_frame,
+ sizeof(tp->setup_frame),
+ DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(d, mapping))) {
+ // WTF ?
+ }
+ tp->tx_buffers[entry].mapping = mapping;
/* Put the setup frame on the Tx list. */
if (entry == TX_RING_SIZE-1)
tx_flags |= DESC_RING_WRAP; /* Wrap ring. */
tp->tx_ring[entry].length = cpu_to_le32(tx_flags);
- tp->tx_ring[entry].buffer1 =
- cpu_to_le32(tp->tx_buffers[entry].mapping);
+ tp->tx_ring[entry].buffer1 = cpu_to_le32(mapping);
tp->tx_ring[entry].status = cpu_to_le32(DescOwned);
if (dummy >= 0)
tp->tx_ring[dummy].status = cpu_to_le32(DescOwned);
@@ -1445,10 +1486,10 @@ static int tulip_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
tp = netdev_priv(dev);
tp->dev = dev;
- tp->rx_ring = pci_alloc_consistent(pdev,
- sizeof(struct tulip_rx_desc) * RX_RING_SIZE +
- sizeof(struct tulip_tx_desc) * TX_RING_SIZE,
- &tp->rx_ring_dma);
+ tp->rx_ring = dma_alloc_coherent(&pdev->dev,
+ sizeof(struct tulip_rx_desc) * RX_RING_SIZE +
+ sizeof(struct tulip_tx_desc) * TX_RING_SIZE,
+ &tp->rx_ring_dma, GFP_KERNEL);
if (!tp->rx_ring)
goto err_out_mtable;
tp->tx_ring = (struct tulip_tx_desc *)(tp->rx_ring + RX_RING_SIZE);
@@ -1783,10 +1824,10 @@ static int tulip_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
return 0;
err_out_free_ring:
- pci_free_consistent (pdev,
- sizeof (struct tulip_rx_desc) * RX_RING_SIZE +
- sizeof (struct tulip_tx_desc) * TX_RING_SIZE,
- tp->rx_ring, tp->rx_ring_dma);
+ dma_free_coherent(&pdev->dev,
+ sizeof(struct tulip_rx_desc) * RX_RING_SIZE +
+ sizeof(struct tulip_tx_desc) * TX_RING_SIZE,
+ tp->rx_ring, tp->rx_ring_dma);
err_out_mtable:
kfree (tp->mtable);
@@ -1874,8 +1915,8 @@ static int tulip_resume(struct pci_dev *pdev)
struct net_device *dev = pci_get_drvdata(pdev);
struct tulip_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->base_addr;
- int retval;
unsigned int tmp;
+ int retval;
if (!dev)
return -EINVAL;
@@ -1913,9 +1954,9 @@ static int tulip_resume(struct pci_dev *pdev)
netif_device_attach(dev);
if (netif_running(dev))
- tulip_up(dev);
+ retval = tulip_up(dev);
- return 0;
+ return retval;
}
#endif /* CONFIG_PM */
@@ -1924,17 +1965,13 @@ static int tulip_resume(struct pci_dev *pdev)
static void tulip_remove_one(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata (pdev);
- struct tulip_private *tp;
-
- if (!dev)
- return;
+ struct tulip_private *tp = netdev_priv(dev);
- tp = netdev_priv(dev);
unregister_netdev(dev);
- pci_free_consistent (pdev,
- sizeof (struct tulip_rx_desc) * RX_RING_SIZE +
- sizeof (struct tulip_tx_desc) * TX_RING_SIZE,
- tp->rx_ring, tp->rx_ring_dma);
+ dma_free_coherent(&pdev->dev,
+ sizeof(struct tulip_rx_desc) * RX_RING_SIZE +
+ sizeof(struct tulip_tx_desc) * TX_RING_SIZE,
+ tp->rx_ring, tp->rx_ring_dma);
kfree (tp->mtable);
pci_iounmap(pdev, tp->base_addr);
free_netdev (dev);
--
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