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Message-ID: <20091125012043.32704.15951.stgit@gitlad.jf.intel.com>
Date: Tue, 24 Nov 2009 17:20:43 -0800
From: Alexander Duyck <alexander.h.duyck@...el.com>
To: mcarlson@...adcom.com, mchan@...adcom.com,
sathyap@...verengines.com, subbus@...verengines.com,
davem@...emloft.net
Cc: netdev@...r.kernel.org
Subject: [RFC PATCH 06/10] igbvf: remove skb_dma_map/unmap call from drivers
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@...el.com>
---
drivers/net/igbvf/igbvf.h | 1 +
drivers/net/igbvf/netdev.c | 65 +++++++++++++++++++++++++++++++++++---------
2 files changed, 52 insertions(+), 14 deletions(-)
diff --git a/drivers/net/igbvf/igbvf.h b/drivers/net/igbvf/igbvf.h
index 8e9b67e..3d1ee7a 100644
--- a/drivers/net/igbvf/igbvf.h
+++ b/drivers/net/igbvf/igbvf.h
@@ -117,6 +117,7 @@ struct igbvf_buffer {
unsigned long time_stamp;
u16 length;
u16 next_to_watch;
+ u16 mapped_as_page;
};
/* Rx */
struct {
diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index e01f445..cf26f92 100644
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -366,10 +366,20 @@ next_desc:
static void igbvf_put_txbuf(struct igbvf_adapter *adapter,
struct igbvf_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;
}
@@ -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,
--
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