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igbvf: remove skb_dma_map/unmap call from drivers

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This patch removes the skb_dma_map/unmap calls from the igbvf driver due to
the fact that it does not play well with HW IOMMU when combined with
transmitting cloned skbs.

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 16:47:37 +00:00 committed by David S. Miller
parent 6366ad331f
commit a7d5ca40ff
2 changed files with 52 additions and 14 deletions
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1
drivers/net/igbvf/igbvf.h
View File

@ -117,6 +117,7 @@ struct igbvf_buffer {
unsigned long time_stamp;
u16 length;
u16 next_to_watch;
u16 mapped_as_page;
};
/* Rx */
struct {

63
drivers/net/igbvf/netdev.c
View File

@ -366,10 +366,20 @@ next_desc:
static void igbvf_put_txbuf(struct igbvf_adapter *adapter,
struct igbvf_buffer *buffer_info)
{
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;
}
@ -2088,27 +2098,24 @@ static inline int igbvf_tx_map_adv(struct igbvf_adapter *adapter,
unsigned int first)
{
struct igbvf_buffer *buffer_info;
struct pci_dev *pdev = adapter->pdev;
unsigned int len = skb_headlen(skb);
unsigned int count = 0, i;
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;
buffer_info = &tx_ring->buffer_info[i];
BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
buffer_info->length = len;
/* set time_stamp *before* dma to help avoid a possible race */
buffer_info->time_stamp = jiffies;
buffer_info->next_to_watch = i;
buffer_info->dma = skb_shinfo(skb)->dma_head;
buffer_info->dma = pci_map_single(pdev, skb->data, len,
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(pdev, buffer_info->dma))
goto dma_error;
for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
struct skb_frag_struct *frag;
@ -2125,14 +2132,44 @@ static inline int igbvf_tx_map_adv(struct igbvf_adapter *adapter,
buffer_info->length = len;
buffer_info->time_stamp = jiffies;
buffer_info->next_to_watch = i;
buffer_info->dma = map[count];
buffer_info->mapped_as_page = true;
buffer_info->dma = pci_map_page(pdev,
frag->page,
frag->page_offset,
len,
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(pdev, buffer_info->dma))
goto dma_error;
count++;
}
tx_ring->buffer_info[i].skb = skb;
tx_ring->buffer_info[first].next_to_watch = i;
return count + 1;
return ++count;
dma_error:
dev_err(&pdev->dev, "TX DMA map failed\n");
/* clear timestamp and dma mappings for failed buffer_info mapping */
buffer_info->dma = 0;
buffer_info->time_stamp = 0;
buffer_info->length = 0;
buffer_info->next_to_watch = 0;
buffer_info->mapped_as_page = false;
count--;
/* clear timestamp and dma mappings for remaining portion of packet */
while (count >= 0) {
count--;
i--;
if (i < 0)
i += tx_ring->count;
buffer_info = &tx_ring->buffer_info[i];
igbvf_put_txbuf(adapter, buffer_info);
}
return 0;
}
static inline void igbvf_tx_queue_adv(struct igbvf_adapter *adapter,