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Message-Id: <1237325367.27681.344.camel@macbook.infradead.org>
Date: Tue, 17 Mar 2009 21:29:27 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: netdev@...r.kernel.org
Subject: [PATCH 15/30] solos: Tidy up DMA handling a little. Still untested
Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
---
drivers/atm/solos-pci.c | 95 ++++++++++++++++++++++++++---------------------
1 files changed, 53 insertions(+), 42 deletions(-)
diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c
index 63c9ad0..acba08d 100644
--- a/drivers/atm/solos-pci.c
+++ b/drivers/atm/solos-pci.c
@@ -68,6 +68,8 @@
#define RX_BUF(card, nr) ((card->buffers) + (nr)*BUF_SIZE*2)
#define TX_BUF(card, nr) ((card->buffers) + (nr)*BUF_SIZE*2 + BUF_SIZE)
+#define RX_DMA_SIZE 2048
+
static int debug = 0;
static int atmdebug = 0;
static int firmware_upgrade = 0;
@@ -608,17 +610,11 @@ void solos_bh(unsigned long card_arg)
if (card->using_dma) {
skb = card->rx_skb[port];
- pci_unmap_single(card->dev, SKB_CB(skb)->dma_addr, skb->len,
- PCI_DMA_FROMDEVICE);
-
- card->rx_skb[port] = alloc_skb(2048, GFP_ATOMIC);
- if (card->rx_skb[port]) {
- SKB_CB(card->rx_skb[port])->dma_addr =
- pci_map_single(card->dev, skb->data, skb->len,
- PCI_DMA_FROMDEVICE);
- iowrite32(SKB_CB(card->rx_skb[port])->dma_addr,
- card->config_regs + RX_DMA_ADDR(port));
- }
+ card->rx_skb[port] = NULL;
+
+ pci_unmap_single(card->dev, SKB_CB(skb)->dma_addr,
+ RX_DMA_SIZE, PCI_DMA_FROMDEVICE);
+
header = (void *)skb->data;
size = le16_to_cpu(header->size);
skb_put(skb, size + sizeof(*header));
@@ -669,7 +665,7 @@ void solos_bh(unsigned long card_arg)
case PKT_STATUS:
process_status(card, port, skb);
- dev_kfree_skb(skb);
+ dev_kfree_skb_any(skb);
break;
case PKT_COMMAND:
@@ -681,12 +677,32 @@ void solos_bh(unsigned long card_arg)
if (net_ratelimit())
dev_warn(&card->dev->dev, "Dropping console response on port %d\n",
port);
+ dev_kfree_skb_any(skb);
} else
skb_queue_tail(&card->cli_queue[port], skb);
spin_unlock(&card->cli_queue_lock);
break;
}
}
+ /* Allocate RX skbs for any ports which need them */
+ if (card->using_dma && card->atmdev[port] &&
+ !card->rx_skb[port]) {
+ struct sk_buff *skb = alloc_skb(RX_DMA_SIZE, GFP_ATOMIC);
+ if (skb) {
+ SKB_CB(skb)->dma_addr =
+ pci_map_single(card->dev, skb->data,
+ RX_DMA_SIZE, PCI_DMA_FROMDEVICE);
+ iowrite32(SKB_CB(skb)->dma_addr,
+ card->config_regs + RX_DMA_ADDR(port));
+ card->rx_skb[port] = skb;
+ } else {
+ if (net_ratelimit())
+ dev_warn(&card->dev->dev, "Failed to allocate RX skb");
+
+ /* We'll have to try again later */
+ tasklet_schedule(&card->tlet);
+ }
+ }
}
if (rx_done)
iowrite32(rx_done, card->config_regs + FLAGS_ADDR);
@@ -901,50 +917,45 @@ static int fpga_tx(struct solos_card *card)
for (port = 0; port < card->nr_ports; port++) {
if (card->atmdev[port] && !(tx_pending & (1 << port))) {
+ struct sk_buff *oldskb = card->tx_skb[port];
+ if (oldskb)
+ pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
+ oldskb->len, PCI_DMA_TODEVICE);
+
spin_lock(&card->tx_queue_lock);
skb = skb_dequeue(&card->tx_queue[port]);
spin_unlock(&card->tx_queue_lock);
- if (!skb)
+ if (skb && !card->using_dma) {
+ memcpy_toio(TX_BUF(card, port), skb->data, skb->len);
+ tx_started |= 1 << port; //Set TX full flag
+ oldskb = skb; /* We're done with this skb already */
+ } else if (skb && card->using_dma) {
+ SKB_CB(skb)->dma_addr = pci_map_single(card->dev, skb->data,
+ skb->len, PCI_DMA_TODEVICE);
+ iowrite32(SKB_CB(skb)->dma_addr,
+ card->config_regs + TX_DMA_ADDR(port));
+ }
+
+ if (!oldskb)
continue;
+ /* Clean up and free oldskb now it's gone */
if (atmdebug) {
dev_info(&card->dev->dev, "Transmitted: port %d\n",
port);
- print_buffer(skb);
+ print_buffer(oldskb);
}
- if (card->using_dma) {
- if (card->tx_skb[port]) {
- struct sk_buff *oldskb = card->tx_skb[port];
-
- pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
- oldskb->len, PCI_DMA_TODEVICE);
-
- vcc = SKB_CB(oldskb)->vcc;
-
- if (vcc) {
- atomic_inc(&vcc->stats->tx);
- solos_pop(vcc, oldskb);
- } else
- dev_kfree_skb_irq(oldskb);
- }
- SKB_CB(skb)->dma_addr = pci_map_single(card->dev, skb->data,
- skb->len, PCI_DMA_TODEVICE);
- iowrite32(SKB_CB(skb)->dma_addr, card->config_regs + TX_DMA_ADDR(port));
- } else {
- memcpy_toio(TX_BUF(card, port), skb->data, skb->len);
- tx_started |= 1 << port; //Set TX full flag
+ vcc = SKB_CB(oldskb)->vcc;
- vcc = SKB_CB(skb)->vcc;
+ if (vcc) {
+ atomic_inc(&vcc->stats->tx);
+ solos_pop(vcc, oldskb);
+ } else
+ dev_kfree_skb_irq(oldskb);
- if (vcc) {
- atomic_inc(&vcc->stats->tx);
- solos_pop(vcc, skb);
- } else
- dev_kfree_skb_irq(skb);
- }
}
}
if (tx_started)
--
1.6.0.6
--
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