Re: [PATCH][1/4] b44: Ignore carrier lost errors

Pekka Pietikainen
2004-08-30T06:10:41Z

On Sun, Aug 29, 2004 at 07:49:28PM -0400, Jeff Garzik wrote:
> > BTW, can someone fixup something for me? Update MODULE_AUTHOR()
> > please :-) 3/4 of this driver have been rewritten since I last
> > touched it, heh.
>
> hehe. I'll take care of it tonight when I queue Florian's stuff
> to netdev-2.6 (and thus -mm, and thus eventually mainline).
And here's a resend of the bounce buffer patch, which should still
apply on top of Florians (or without) just fine.

Signed-off-by: Pekka Pietikainen <pp@ee.oulu.fi>
--- linux-2.6.8-rc3/drivers/net/b44.h.4g4g 2004-08-08 10:54:03.979353080 +0300
+++ linux-2.6.8-rc3/drivers/net/b44.h 2004-08-08 10:54:17.928232528 +0300
@@ -493,6 +493,7 @@

struct ring_info *rx_buffers;
struct ring_info *tx_buffers;
+ unsigned char *tx_bufs;

u32 dma_offset;
u32 flags;
@@ -525,7 +526,7 @@
struct pci_dev *pdev;
struct net_device *dev;

- dma_addr_t rx_ring_dma, tx_ring_dma;
+ dma_addr_t rx_ring_dma, tx_ring_dma,tx_bufs_dma;

u32 rx_pending;
u32 tx_pending;
--- linux-2.6.8-rc3/drivers/net/b44.c.4g4g 2004-08-08 10:53:58.724151992 +0300
+++ linux-2.6.8-rc3/drivers/net/b44.c 2004-08-08 10:54:17.657273720 +0300
@@ -27,8 +27,8 @@

#define DRV_MODULE_NAME "b44"
#define PFX DRV_MODULE_NAME ": "
-#define DRV_MODULE_VERSION "0.94"
-#define DRV_MODULE_RELDATE "May 4, 2004"
+#define DRV_MODULE_VERSION "0.95"
+#define DRV_MODULE_RELDATE "Aug 3, 2004"

#define B44_DEF_MSG_ENABLE \
(NETIF_MSG_DRV | \
@@ -57,6 +57,7 @@
#define B44_DEF_TX_RING_PENDING (B44_TX_RING_SIZE - 1)
#define B44_TX_RING_BYTES (sizeof(struct dma_desc) * \
B44_TX_RING_SIZE)
+#define B44_DMA_MASK 0x3fffffff

#define TX_RING_GAP(BP) \
(B44_TX_RING_SIZE - (BP)->tx_pending)
@@ -67,6 +68,7 @@
#define NEXT_TX(N) (((N) + 1) & (B44_TX_RING_SIZE - 1))

#define RX_PKT_BUF_SZ (1536 + bp->rx_offset + 64)
+#define TX_PKT_BUF_SZ (B44_MAX_MTU + ETH_HLEN + 8)

/* minimum number of free TX descriptors required to wake up TX process */
#define B44_TX_WAKEUP_THRESH (B44_TX_RING_SIZE / 4)
@@ -631,10 +633,30 @@
if (skb == NULL)
return -ENOMEM;

- skb->dev = bp->dev;
mapping = pci_map_single(bp->pdev, skb->data,
RX_PKT_BUF_SZ,
PCI_DMA_FROMDEVICE);
+
+ /* Hardware bug work-around, the chip is unable to do PCI DMA
+ to/from anything above 1GB :-( */
+ if(mapping+RX_PKT_BUF_SZ > B44_DMA_MASK) {
+ /* Sigh... */
+ pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);
+ dev_kfree_skb_any(skb);
+ skb = __dev_alloc_skb(RX_PKT_BUF_SZ,GFP_DMA);
+ if (skb == NULL)
+ return -ENOMEM;
+ mapping = pci_map_single(bp->pdev, skb->data,
+ RX_PKT_BUF_SZ,
+ PCI_DMA_FROMDEVICE);
+ if(mapping+RX_PKT_BUF_SZ > B44_DMA_MASK) {
+ pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);
+ dev_kfree_skb_any(skb);
+ return -ENOMEM;
+ }
+ }
+
+ skb->dev = bp->dev;
skb_reserve(skb, bp->rx_offset);

rh = (struct rx_header *)
@@ -912,6 +934,12 @@

entry = bp->tx_prod;
mapping = pci_map_single(bp->pdev, skb->data, len, PCI_DMA_TODEVICE);
+ if(mapping+len > B44_DMA_MASK) {
+ /* Chip can't handle DMA to/from >1GB, use bounce buffer */
+ pci_unmap_single(bp->pdev, mapping, len,PCI_DMA_TODEVICE);
+ memcpy(bp->tx_bufs+entry*TX_PKT_BUF_SZ,skb->data,skb->len);
+ mapping = pci_map_single(bp->pdev, bp->tx_bufs+entry*TX_PKT_BUF_SZ, len, PCI_DMA_TODEVICE);
+ }

bp->tx_buffers[entry].skb = skb;
pci_unmap_addr_set(&bp->tx_buffers[entry], mapping, mapping);
@@ -1059,6 +1087,11 @@
bp->tx_ring, bp->tx_ring_dma);
bp->tx_ring = NULL;
}
+ if (bp->tx_bufs) {
+ pci_free_consistent(bp->pdev, B44_TX_RING_SIZE * TX_PKT_BUF_SZ,
+ bp->tx_bufs, bp->tx_bufs_dma);
+ bp->tx_bufs = NULL;
+ }
}

/*
@@ -1081,6 +1114,12 @@
goto out_err;
memset(bp->tx_buffers, 0, size);

+ size = B44_TX_RING_SIZE * TX_PKT_BUF_SZ;
+ bp->tx_bufs = pci_alloc_consistent(bp->pdev, size, &bp->tx_bufs_dma);
+ if (!bp->tx_bufs)
+ goto out_err;
+ memset(bp->tx_bufs, 0, size);
+
size = DMA_TABLE_BYTES;
bp->rx_ring = pci_alloc_consistent(bp->pdev, size, &bp->rx_ring_dma);
if (!bp->rx_ring)
@@ -1746,12 +1785,19 @@

pci_set_master(pdev);

- err = pci_set_dma_mask(pdev, (u64) 0xffffffff);
+ err = pci_set_dma_mask(pdev, (u64) B44_DMA_MASK);
if (err) {
printk(KERN_ERR PFX "No usable DMA configuration, "
"aborting.\n");
goto err_out_free_res;
}
+
+ err = pci_set_consistent_dma_mask(pdev, (u64) B44_DMA_MASK);
+ if (err) {
+ printk(KERN_ERR PFX "No usable DMA configuration, "
+ "aborting.\n");
+ goto err_out_free_res;
+ }

b44reg_base = pci_resource_start(pdev, 0);
b44reg_len = pci_resource_len(pdev, 0);