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ixgb: fix rare early tso completion

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Fix rare early completion when using TSO.  This essentially is the
e1000 fix, with code that was mostly already written. Another skb frag
was also needed.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
This commit is contained in:
Auke Kok 2006-05-23 10:29:41 -07:00 committed by Auke Kok
parent 4e3ceac609
commit 96f9c2e277
1 changed files with 15 additions and 2 deletions
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17
drivers/net/ixgb/ixgb_main.c
View file

@ -1266,6 +1266,7 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
struct ixgb_buffer *buffer_info;
int len = skb->len;
unsigned int offset = 0, size, count = 0, i;
unsigned int mss = skb_shinfo(skb)->tso_size;
unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
unsigned int f;
@ -1277,6 +1278,11 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
while(len) {
buffer_info = &tx_ring->buffer_info[i];
size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
/* Workaround for premature desc write-backs
* in TSO mode. Append 4-byte sentinel desc */
if(unlikely(mss && !nr_frags && size == len && size > 8))
size -= 4;
buffer_info->length = size;
buffer_info->dma =
pci_map_single(adapter->pdev,
@ -1301,6 +1307,12 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
while(len) {
buffer_info = &tx_ring->buffer_info[i];
size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
/* Workaround for premature desc write-backs
* in TSO mode. Append 4-byte sentinel desc */
if(unlikely(mss && (f == (nr_frags-1)) && (size == len)
&& (size > 8)))
size -= 4;
buffer_info->length = size;
buffer_info->dma =
pci_map_page(adapter->pdev,
@ -1378,7 +1390,8 @@ ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
(((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 \
/* one more for TSO workaround */ + 1
static int
ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
@ -1416,7 +1429,7 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
return NETDEV_TX_OK;
}
if (tso)
if (likely(tso))
tx_flags |= IXGB_TX_FLAGS_TSO;
else if(ixgb_tx_csum(adapter, skb))
tx_flags |= IXGB_TX_FLAGS_CSUM;