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igb: cleanup tx dma so map & unmap use matching calls

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The igb driver was using map_single to map the skbs and then unmap_page to
unmap them.  This update changes that so instead uses skb_dma_map and
skb_dma_unmap.

In addition the next_to_watch member of the buffer_info struct was being
set uneccesarily.  I removed the spots where it was set without being needed.

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 2009-03-20 00:17:43 +00:00 committed by David S. Miller
parent c5cd11e380
commit 65689fef7e
1 changed files with 34 additions and 30 deletions
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64
drivers/net/igb/igb_main.c
View file

@ -2257,19 +2257,14 @@ static void igb_free_all_tx_resources(struct igb_adapter *adapter)
static void igb_unmap_and_free_tx_resource(struct igb_adapter *adapter,
struct igb_buffer *buffer_info)
{
if (buffer_info->dma) {
pci_unmap_page(adapter->pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_TODEVICE);
buffer_info->dma = 0;
}
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;
}
buffer_info->time_stamp = 0;
buffer_info->next_to_watch = 0;
/* buffer_info must be completely set up in the transmit path */
}
@ -3078,25 +3073,33 @@ static inline int igb_tx_map_adv(struct igb_adapter *adapter,
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 >= IGB_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 = pci_map_single(adapter->pdev, skb->data, len,
PCI_DMA_TODEVICE);
buffer_info->dma = map[count];
count++;
i++;
if (i == tx_ring->count)
i = 0;
for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
struct skb_frag_struct *frag;
i++;
if (i == tx_ring->count)
i = 0;
frag = &skb_shinfo(skb)->frags[f];
len = frag->size;
@ -3105,19 +3108,10 @@ static inline int igb_tx_map_adv(struct igb_adapter *adapter,
buffer_info->length = len;
buffer_info->time_stamp = jiffies;
buffer_info->next_to_watch = i;
buffer_info->dma = pci_map_page(adapter->pdev,
frag->page,
frag->page_offset,
len,
PCI_DMA_TODEVICE);
buffer_info->dma = map[count];
count++;
i++;
if (i == tx_ring->count)
i = 0;
}
i = ((i == 0) ? tx_ring->count - 1 : i - 1);
tx_ring->buffer_info[i].skb = skb;
tx_ring->buffer_info[first].next_to_watch = i;
@ -3230,6 +3224,7 @@ static int igb_xmit_frame_ring_adv(struct sk_buff *skb,
unsigned int first;
unsigned int tx_flags = 0;
u8 hdr_len = 0;
int count = 0;
int tso = 0;
union skb_shared_tx *shtx;
@ -3291,14 +3286,23 @@ static int igb_xmit_frame_ring_adv(struct sk_buff *skb,
(skb->ip_summed == CHECKSUM_PARTIAL))
tx_flags |= IGB_TX_FLAGS_CSUM;
igb_tx_queue_adv(adapter, tx_ring, tx_flags,
igb_tx_map_adv(adapter, tx_ring, skb, first),
skb->len, hdr_len);
/*
* count reflects descriptors mapped, if 0 then mapping error
* has occured and we need to rewind the descriptor queue
*/
count = igb_tx_map_adv(adapter, tx_ring, skb, first);
netdev->trans_start = jiffies;
/* Make sure there is space in the ring for the next send. */
igb_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 4);
if (count) {
igb_tx_queue_adv(adapter, tx_ring, tx_flags, count,
skb->len, hdr_len);
netdev->trans_start = jiffies;
/* Make sure there is space in the ring for the next send. */
igb_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 4);
} else {
dev_kfree_skb_any(skb);
tx_ring->buffer_info[first].time_stamp = 0;
tx_ring->next_to_use = first;
}
return NETDEV_TX_OK;
}