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ixgb: refactor tx path to use skb_dma_map/unmap 

This code updates ixgb so that it can use the skb_dma_map/unmap functions
to map the buffers.  In addition it also updates the tx hang logic to use
time_stamp instead of dma to determine if it has detected a tx hang.

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 2009-03-19 01:15:21 +00:00 committed by David S. Miller
parent 5f66f20806
commit fe52eeb82b
1 changed files with 39 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
drivers/net/ixgb/ixgb_main.c
View File

@ -887,19 +887,13 @@ static void
ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
struct ixgb_buffer *buffer_info)
{
struct pci_dev *pdev = adapter->pdev;
if (buffer_info->dma)
pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
PCI_DMA_TODEVICE);
/* okay to call kfree_skb here instead of kfree_skb_any because
* this is never called in interrupt context */
if (buffer_info->skb)
dev_kfree_skb(buffer_info->skb);
buffer_info->skb = NULL;
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;
/* these fields must always be initialized in tx
* buffer_info->length = 0;
@ -1275,17 +1269,23 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
{
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
struct ixgb_buffer *buffer_info;
int len = skb->len;
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;
len -= skb->data_len;
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);
@ -1297,7 +1297,7 @@ 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 =
buffer_info->dma = map[0] + offset;
pci_map_single(adapter->pdev,
skb->data + offset,
size,
@ -1307,7 +1307,11 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
len -= size;
offset += size;
count++;
if (++i == tx_ring->count) i = 0;
if (len) {
i++;
if (i == tx_ring->count)
i = 0;
}
}
for (f = 0; f < nr_frags; f++) {
@ -1318,6 +1322,10 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
offset = 0;
while (len) {
i++;
if (i == tx_ring->count)
i = 0;
buffer_info = &tx_ring->buffer_info[i];
size = min(len, IXGB_MAX_DATA_PER_TXD);
@ -1329,21 +1337,14 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
buffer_info->length = size;
buffer_info->time_stamp = jiffies;
buffer_info->dma =
pci_map_page(adapter->pdev,
frag->page,
frag->page_offset + offset,
size,
PCI_DMA_TODEVICE);
buffer_info->dma = map[f + 1] + offset;
buffer_info->next_to_watch = 0;
len -= size;
offset += size;
count++;
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;
@ -1445,6 +1446,7 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
unsigned int first;
unsigned int tx_flags = 0;
int vlan_id = 0;
int count = 0;
int tso;
if (test_bit(__IXGB_DOWN, &adapter->flags)) {
@ -1479,13 +1481,19 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
else if (ixgb_tx_csum(adapter, skb))
tx_flags |= IXGB_TX_FLAGS_CSUM;
ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
tx_flags);
count = ixgb_tx_map(adapter, skb, first);
netdev->trans_start = jiffies;
if (count) {
ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
netdev->trans_start = jiffies;
/* Make sure there is space in the ring for the next send. */
ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
/* Make sure there is space in the ring for the next send. */
ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
} else {
dev_kfree_skb_any(skb);
adapter->tx_ring.buffer_info[first].time_stamp = 0;
adapter->tx_ring.next_to_use = first;
}
return NETDEV_TX_OK;
}
@ -1818,7 +1826,7 @@ ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
/* detect a transmit hang in hardware, this serializes the
* check with the clearing of time_stamp and movement of i */
adapter->detect_tx_hung = false;
if (tx_ring->buffer_info[eop].dma &&
if (tx_ring->buffer_info[eop].time_stamp &&
time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
&& !(IXGB_READ_REG(&adapter->hw, STATUS) &
IXGB_STATUS_TXOFF)) {