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Commit 152a2a8b authored by David Woodhouse's avatar David Woodhouse Committed by David S. Miller
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solos-pci: ensure all TX packets are aligned to 4 bytes 



The FPGA can't handled unaligned DMA (yet). So copy into an aligned buffer,
if skb->data isn't suitably aligned.

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 13af8164

drivers/atm/solos-pci.c

+23 −4
Original line number Diff line number Diff line
@@ -128,9 +128,11 @@ struct solos_card { 
	struct sk_buff_head cli_queue[4];

	struct sk_buff *tx_skb[4];

	struct sk_buff *rx_skb[4];

	unsigned char *dma_bounce;

	wait_queue_head_t param_wq;

	wait_queue_head_t fw_wq;

	int using_dma;

	int dma_alignment;

	int fpga_version;

	int buffer_size;

	int atmel_flash;
@@ -1083,7 +1085,12 @@ static uint32_t fpga_tx(struct solos_card *card) 
				tx_started |= 1 << port;

				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,

				unsigned char *data = skb->data;

				if ((unsigned long)data & card->dma_alignment) {

					data = card->dma_bounce + (BUF_SIZE * port);

					memcpy(data, skb->data, skb->len);

				}

				SKB_CB(skb)->dma_addr = pci_map_single(card->dev, data,

								       skb->len, PCI_DMA_TODEVICE);

				card->tx_skb[port] = skb;

				iowrite32(SKB_CB(skb)->dma_addr,
@@ -1261,18 +1268,27 @@ static int fpga_probe(struct pci_dev *dev, const struct pci_device_id *id) 
	else

		card->atmel_flash = 0;



	data32 = ioread32(card->config_regs + PORTS);

	card->nr_ports = (data32 & 0x000000FF);



	if (card->fpga_version >= DMA_SUPPORTED) {

		pci_set_master(dev);

		card->using_dma = 1;

		if (1) { /* All known FPGA versions so far */

			card->dma_alignment = 3;

			card->dma_bounce = kmalloc(card->nr_ports * BUF_SIZE, GFP_KERNEL);

			if (!card->dma_bounce) {

				dev_warn(&card->dev->dev, "Failed to allocate DMA bounce buffers\n");

				/* Fallback to MMIO doesn't work */

				goto out_unmap_both;

			}

		}

	} else {

		card->using_dma = 0;

		/* Set RX empty flag for all ports */

		iowrite32(0xF0, card->config_regs + FLAGS_ADDR);

	}



	data32 = ioread32(card->config_regs + PORTS);

	card->nr_ports = (data32 & 0x000000FF);



	pci_set_drvdata(dev, card);



	tasklet_init(&card->tlet, solos_bh, (unsigned long)card);
@@ -1319,6 +1335,7 @@ static int fpga_probe(struct pci_dev *dev, const struct pci_device_id *id) 
	tasklet_kill(&card->tlet);

	

 out_unmap_both:

	kfree(card->dma_bounce);

	pci_set_drvdata(dev, NULL);

	pci_iounmap(dev, card->buffers);

 out_unmap_config:
@@ -1429,6 +1446,8 @@ static void fpga_remove(struct pci_dev *dev) 
	free_irq(dev->irq, card);

	tasklet_kill(&card->tlet);



	kfree(card->dma_bounce);



	/* Release device from reset */

	iowrite32(0, card->config_regs + FPGA_MODE);

	(void)ioread32(card->config_regs + FPGA_MODE);