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ixgb: remove use of skb_dma_map from ixgb

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skb_dma_map is incompatible with HW iommu due to the fact that multiple
mappings can result in different results each time.  For this reason it is
best to just remove use of these function calls.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2009-12-02 16:46:31 +00:00 committed by David S. Miller
parent 602c0554d7
commit adeaa90863
2 changed files with 42 additions and 19 deletions
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1
drivers/net/ixgb/ixgb.h
View file

@ -117,6 +117,7 @@ struct ixgb_buffer {
unsigned long time_stamp;
u16 length;
u16 next_to_watch;
u16 mapped_as_page;
};
struct ixgb_desc_ring {

60
drivers/net/ixgb/ixgb_main.c
View file

@ -892,10 +892,18 @@ static void
ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
struct ixgb_buffer *buffer_info)
{
buffer_info->dma = 0;
if (buffer_info->dma) {
if (buffer_info->mapped_as_page)
pci_unmap_page(adapter->pdev, buffer_info->dma,
buffer_info->length, PCI_DMA_TODEVICE);
else
pci_unmap_single(adapter->pdev, buffer_info->dma,
buffer_info->length,
PCI_DMA_TODEVICE);
buffer_info->dma = 0;
}
if (buffer_info->skb) {
skb_dma_unmap(&adapter->pdev->dev, buffer_info->skb,
DMA_TO_DEVICE);
dev_kfree_skb_any(buffer_info->skb);
buffer_info->skb = NULL;
}
@ -1272,24 +1280,16 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
unsigned int first)
{
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
struct pci_dev *pdev = adapter->pdev;
struct ixgb_buffer *buffer_info;
int len = skb_headlen(skb);
unsigned int offset = 0, size, count = 0, i;
unsigned int mss = skb_shinfo(skb)->gso_size;
unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
unsigned int f;
dma_addr_t *map;
i = tx_ring->next_to_use;
if (skb_dma_map(&adapter->pdev->dev, skb, DMA_TO_DEVICE)) {
dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
return 0;
}
map = skb_shinfo(skb)->dma_maps;
while (len) {
buffer_info = &tx_ring->buffer_info[i];
size = min(len, IXGB_MAX_DATA_PER_TXD);
@ -1301,11 +1301,11 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
buffer_info->length = size;
WARN_ON(buffer_info->dma != 0);
buffer_info->time_stamp = jiffies;
buffer_info->dma = skb_shinfo(skb)->dma_head + offset;
pci_map_single(adapter->pdev,
skb->data + offset,
size,
PCI_DMA_TODEVICE);
buffer_info->mapped_as_page = false;
buffer_info->dma = pci_map_single(pdev, skb->data + offset,
size, PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(pdev, buffer_info->dma))
goto dma_error;
buffer_info->next_to_watch = 0;
len -= size;
@ -1323,7 +1323,7 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
frag = &skb_shinfo(skb)->frags[f];
len = frag->size;
offset = 0;
offset = frag->page_offset;
while (len) {
i++;
@ -1341,7 +1341,13 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
buffer_info->length = size;
buffer_info->time_stamp = jiffies;
buffer_info->dma = map[f] + offset;
buffer_info->mapped_as_page = true;
buffer_info->dma =
pci_map_page(pdev, frag->page,
offset, size,
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(pdev, buffer_info->dma))
goto dma_error;
buffer_info->next_to_watch = 0;
len -= size;
@ -1353,6 +1359,22 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
tx_ring->buffer_info[first].next_to_watch = i;
return count;
dma_error:
dev_err(&pdev->dev, "TX DMA map failed\n");
buffer_info->dma = 0;
count--;
while (count >= 0) {
count--;
i--;
if (i < 0)
i += tx_ring->count;
buffer_info = &tx_ring->buffer_info[i];
ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
}
return 0;
}
static void