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Message-ID: <20090319111521.11723.60786.stgit@lost.foo-projects.org>
Date: Thu, 19 Mar 2009 04:15:21 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, gospo@...hat.com,
Alexander Duyck <alexander.h.duyck@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next PATCH] ixgb: refactor tx path to use skb_dma_map/unmap
From: Alexander Duyck <alexander.h.duyck@...el.com>
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@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ixgb/ixgb_main.c | 70 +++++++++++++++++++++++-------------------
1 files changed, 39 insertions(+), 31 deletions(-)
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index e2ef16b..4b0ea66 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -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)) {
--
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