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Subject[PATCH] 2.4.4-ac11 - dma mapping in drivers/net/fealnx.c
The patch makes the driver use the dma mapping interface.
It compiles.
No adequate adapter for testing.

--- linux-2.4.4-ac11/drivers/net/fealnx.c Sat May 19 14:36:37 2001
+++ linux-2.4.4-ac11/drivers/net/fealnx.c Sun May 20 15:53:26 2001
@@ -46,6 +46,8 @@ static int full_duplex[MAX_UNITS] = { -1
// #define RX_RING_SIZE 32
#define TX_RING_SIZE 6
#define RX_RING_SIZE 12
+#define TX_TOTAL_SIZE TX_RING_SIZE*sizeof(struct fealnx_desc)
+#define RX_TOTAL_SIZE RX_RING_SIZE*sizeof(struct fealnx_desc)

/* Operational parameters that usually are not changed. */
/* Time in jiffies before concluding the transmitter is hung. */
@@ -363,8 +365,11 @@ enum tx_desc_control_bits {

struct netdev_private {
/* Descriptor rings first for alignment. */
- struct fealnx_desc rx_ring[RX_RING_SIZE];
- struct fealnx_desc tx_ring[TX_RING_SIZE];
+ struct fealnx_desc *rx_ring;
+ struct fealnx_desc *tx_ring;
+
+ dma_addr_t rx_ring_dma;
+ dma_addr_t tx_ring_dma;

struct net_device_stats stats;

@@ -461,6 +466,8 @@ static int __devinit fealnx_init_one(str
long ioaddr;
unsigned int chip_id = ent->driver_data;
struct net_device *dev;
+ void *ring_space;
+ dma_addr_t ring_dma;

/* when built into the kernel, we only print version if device is found */
#ifndef MODULE
@@ -528,6 +535,22 @@ static int __devinit fealnx_init_one(str
np->flags = skel_netdrv_tbl[chip_id].flags;
pci_set_drvdata(pdev, dev);

+ ring_space = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &ring_dma);
+ if (!ring_space) {
+ err = -ENOMEM;
+ goto err_out_free_dev;
+ }
+ np->rx_ring = (struct fealnx_desc *)ring_space;
+ np->rx_ring_dma = ring_dma;
+
+ ring_space = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &ring_dma);
+ if (!ring_space) {
+ err = -ENOMEM;
+ goto err_out_free_rx;
+ }
+ np->tx_ring = (struct fealnx_desc *)ring_space;
+ np->tx_ring_dma = ring_dma;
+
/* find the connected MII xcvrs */
if (np->flags == HAS_MII_XCVR) {
int phy, phy_idx = 0;
@@ -623,7 +646,7 @@ static int __devinit fealnx_init_one(str

err = register_netdev(dev);
if (err)
- goto err_out_free;
+ goto err_out_free_tx;

printk(KERN_INFO "%s: %s at 0x%lx, ",
dev->name, skel_netdrv_tbl[chip_id].chip_name, ioaddr);
@@ -633,7 +656,11 @@ static int __devinit fealnx_init_one(str

return 0;

-err_out_free:
+err_out_free_tx:
+ pci_free_consistent(pdev, TX_TOTAL_SIZE, np->tx_ring, np->tx_ring_dma);
+err_out_free_rx:
+ pci_free_consistent(pdev, RX_TOTAL_SIZE, np->rx_ring, np->rx_ring_dma);
+err_out_free_dev:
kfree(dev);
err_out_unmap:
#ifndef USE_IO_OPS
@@ -647,7 +674,14 @@ err_out_res:
static void __devexit fealnx_remove_one(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
+
if (dev) {
+ struct netdev_private *np = dev->priv;
+
+ pci_free_consistent(pdev, TX_TOTAL_SIZE, np->tx_ring,
+ np->tx_ring_dma);
+ pci_free_consistent(pdev, RX_TOTAL_SIZE, np->rx_ring,
+ np->rx_ring_dma);
unregister_netdev(dev);
#ifndef USE_IO_OPS
iounmap((void *)dev->base_addr);
@@ -828,8 +862,8 @@ static int netdev_open(struct net_device

init_ring(dev);

- writel(virt_to_bus(np->rx_ring), ioaddr + RXLBA);
- writel(virt_to_bus(np->tx_ring), ioaddr + TXLBA);
+ writel(np->rx_ring_dma, ioaddr + RXLBA);
+ writel(np->tx_ring_dma, ioaddr + TXLBA);

/* Initialize other registers. */
/* Configure the PCI bus bursts and FIFO thresholds.
@@ -1077,7 +1111,8 @@ static void allocate_rx_buffers(struct n
break; /* Better luck next round. */

skb->dev = dev; /* Mark as being used by this device. */
- np->lack_rxbuf->buffer = virt_to_bus(skb->tail);
+ np->lack_rxbuf->buffer = pci_map_single(np->pci_dev, skb->tail,
+ np->rx_buf_sz, PCI_DMA_FROMDEVICE);
np->lack_rxbuf = np->lack_rxbuf->next_desc_logical;
++np->really_rx_count;
}
@@ -1168,14 +1203,15 @@ static void init_ring(struct net_device
for (i = 0; i < RX_RING_SIZE; i++) {
np->rx_ring[i].status = 0;
np->rx_ring[i].control = np->rx_buf_sz << RBSShift;
- np->rx_ring[i].next_desc = virt_to_bus(&np->rx_ring[i + 1]);
+ np->rx_ring[i].next_desc = np->rx_ring_dma +
+ (i + 1)*sizeof(struct fealnx_desc);
np->rx_ring[i].next_desc_logical = &np->rx_ring[i + 1];
np->rx_ring[i].skbuff = NULL;
}

/* for the last rx descriptor */
- np->rx_ring[i - 1].next_desc = virt_to_bus(&np->rx_ring[0]);
- np->rx_ring[i - 1].next_desc_logical = &np->rx_ring[0];
+ np->rx_ring[i - 1].next_desc = np->rx_ring_dma;
+ np->rx_ring[i - 1].next_desc_logical = np->rx_ring;

/* allocate skb for rx buffers */
for (i = 0; i < RX_RING_SIZE; i++) {
@@ -1189,7 +1225,8 @@ static void init_ring(struct net_device
++np->really_rx_count;
np->rx_ring[i].skbuff = skb;
skb->dev = dev; /* Mark as being used by this device. */
- np->rx_ring[i].buffer = virt_to_bus(skb->tail);
+ np->rx_ring[i].buffer = pci_map_single(np->pci_dev, skb->tail,
+ np->rx_buf_sz, PCI_DMA_FROMDEVICE);
np->rx_ring[i].status = RXOWN;
np->rx_ring[i].control |= RXIC;
}
@@ -1202,13 +1239,14 @@ static void init_ring(struct net_device

for (i = 0; i < TX_RING_SIZE; i++) {
np->tx_ring[i].status = 0;
- np->tx_ring[i].next_desc = virt_to_bus(&np->tx_ring[i + 1]);
+ np->tx_ring[i].next_desc = np->tx_ring_dma +
+ (i + 1)*sizeof(struct fealnx_desc);
np->tx_ring[i].next_desc_logical = &np->tx_ring[i + 1];
np->tx_ring[i].skbuff = NULL;
}

/* for the last tx descriptor */
- np->tx_ring[i - 1].next_desc = virt_to_bus(&np->tx_ring[0]);
+ np->tx_ring[i - 1].next_desc = np->tx_ring_dma;
np->tx_ring[i - 1].next_desc_logical = &np->tx_ring[0];

return;
@@ -1220,11 +1258,12 @@ static int start_tx(struct sk_buff *skb,
struct netdev_private *np = dev->priv;

np->cur_tx_copy->skbuff = skb;
- np->cur_tx_copy->buffer = virt_to_bus(skb->data);

#define one_buffer
#define BPT 1022
#if defined(one_buffer)
+ np->cur_tx_copy->buffer = pci_map_single(np->pci_dev, skb->data,
+ skb->len, PCI_DMA_TODEVICE);
np->cur_tx_copy->control = TXIC | TXLD | TXFD | CRCEnable | PADEnable;
np->cur_tx_copy->control |= (skb->len << PKTSShift); /* pkt size */
np->cur_tx_copy->control |= (skb->len << TBSShift); /* buffer size */
@@ -1239,6 +1278,8 @@ static int start_tx(struct sk_buff *skb,
struct fealnx_desc *next;

/* for the first descriptor */
+ np->cur_tx_copy->buffer = pci_map_single(np->pci_dev, skb->data,
+ BPT, PCI_DMA_TODEVICE);
np->cur_tx_copy->control = TXIC | TXFD | CRCEnable | PADEnable;
np->cur_tx_copy->control |= (skb->len << PKTSShift); /* pkt size */
np->cur_tx_copy->control |= (BPT << TBSShift); /* buffer size */
@@ -1252,7 +1293,8 @@ static int start_tx(struct sk_buff *skb,
// 89/12/29 add,
if (np->pci_dev->device == 0x891)
np->cur_tx_copy->control |= ETIControl | RetryTxLC;
- next->buffer = virt_to_bus(skb->data) + BPT;
+ next->buffer = pci_map_single(ep->pci_dev, skb->data + BPT,
+ skb->len - BPT, PCI_DMA_TODEVICE);

next->status = TXOWN;
np->cur_tx_copy->status = TXOWN;
@@ -1260,6 +1302,8 @@ static int start_tx(struct sk_buff *skb,
np->cur_tx_copy = next->next_desc_logical;
np->free_tx_count -= 2;
} else {
+ np->cur_tx_copy->buffer = pci_map_single(np->pci_dev, skb->data,
+ skb->len, PCI_DMA_TODEVICE);
np->cur_tx_copy->control = TXIC | TXLD | TXFD | CRCEnable | PADEnable;
np->cur_tx_copy->control |= (skb->len << PKTSShift); /* pkt size */
np->cur_tx_copy->control |= (skb->len << TBSShift); /* buffer size */
@@ -1308,7 +1352,8 @@ void reset_rx_descriptors(struct net_dev

allocate_rx_buffers(dev);

- writel(virt_to_bus(np->cur_rx), dev->base_addr + RXLBA);
+ writel(np->rx_ring_dma + (np->cur_rx - np->rx_ring),
+ dev->base_addr + RXLBA);
writel(np->crvalue, dev->base_addr + TCRRCR);
}

@@ -1421,6 +1466,8 @@ static void intr_handler(int irq, void *
}

/* Free the original skb. */
+ pci_unmap_single(np->pci_dev, np->cur_tx->buffer,
+ np->cur_tx->skbuff->len, PCI_DMA_TODEVICE);
dev_kfree_skb_irq(np->cur_tx->skbuff);
np->cur_tx->skbuff = NULL;
--np->really_tx_count;
@@ -1554,6 +1601,10 @@ static int netdev_rx(struct net_device *
printk(KERN_DEBUG " netdev_rx() normal Rx pkt length %d"
" status %x.\n", pkt_len, rx_status);
#endif
+ pci_dma_sync_single(np->pci_dev, np->cur_rx->buffer,
+ np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+ pci_unmap_single(np->pci_dev, np->cur_rx->buffer,
+ np->rx_buf_sz, PCI_DMA_FROMDEVICE);

/* Check if the packet is long enough to accept without copying
to a minimally-sized skbuff. */
@@ -1564,12 +1615,12 @@ static int netdev_rx(struct net_device *
/* Call copy + cksum if available. */

#if ! defined(__alpha__)
- eth_copy_and_sum(skb, bus_to_virt(np->cur_rx->buffer),
- pkt_len, 0);
+ eth_copy_and_sum(skb,
+ np->cur_rx->skbuff->tail, pkt_len, 0);
skb_put(skb, pkt_len);
#else
memcpy(skb_put(skb, pkt_len),
- bus_to_virt(np->cur_rx->buffer), pkt_len);
+ np->cur_rx->skbuff->tail, pkt_len);
#endif
} else {
skb_put(skb = np->cur_rx->skbuff, pkt_len);
@@ -1592,7 +1643,8 @@ static int netdev_rx(struct net_device *

if (skb != NULL) {
skb->dev = dev; /* Mark as being used by this device. */
- np->cur_rx->buffer = virt_to_bus(skb->tail);
+ np->cur_rx->buffer = pci_map_single(np->pci_dev, skb->tail,
+ np->rx_buf_sz, PCI_DMA_FROMDEVICE);
np->cur_rx->skbuff = skb;
++np->really_rx_count;
}
@@ -1727,16 +1779,26 @@ static int netdev_close(struct net_devic

/* Free all the skbuffs in the Rx queue. */
for (i = 0; i < RX_RING_SIZE; i++) {
+ struct sk_buff *skb = np->rx_ring[i].skbuff;
+
np->rx_ring[i].status = 0;
- if (np->rx_ring[i].skbuff)
- dev_kfree_skb(np->rx_ring[i].skbuff);
- np->rx_ring[i].skbuff = NULL;
+ if (skb) {
+ pci_unmap_single(np->pci_dev, np->rx_ring[i].buffer,
+ np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+ dev_kfree_skb(skb);
+ np->rx_ring[i].skbuff = NULL;
+ }
}

for (i = 0; i < TX_RING_SIZE; i++) {
- if (np->tx_ring[i].skbuff)
- dev_kfree_skb(np->tx_ring[i].skbuff);
- np->tx_ring[i].skbuff = NULL;
+ struct sk_buff *skb = np->tx_ring[i].skbuff;
+
+ if (skb) {
+ pci_unmap_single(np->pci_dev, np->tx_ring[i].buffer,
+ skb->len, PCI_DMA_TODEVICE);
+ dev_kfree_skb(skb);
+ np->tx_ring[i].skbuff = NULL;
+ }
}

return 0;
--
Ueimor
-
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