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ixgb: Fix early TSO completion

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This fix was already merged in commit 96f9c2e277
but reverted in commit 989316ddfe. After
stresstesting we found that the fix does not add new regressions and
works around a TX hang spotted by several users.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
This commit is contained in:
Jesse Brandeburg 2007-01-06 09:51:23 -08:00 committed by Auke Kok
parent 81f4e6c190
commit 5d92785375
1 changed files with 16 additions and 2 deletions
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18
drivers/net/ixgb/ixgb_main.c
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@ -1287,6 +1287,7 @@ 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)->gso_size;
unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
unsigned int f;
@ -1298,6 +1299,11 @@ 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_DATA_PER_TXD);
/* 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;
WARN_ON(buffer_info->dma != 0);
buffer_info->dma =
@ -1324,6 +1330,13 @@ 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_DATA_PER_TXD);
/* 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_page(adapter->pdev,
@ -1401,8 +1414,9 @@ ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
/* Tx Descriptors needed, worst case */
#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
#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
+ 1 /* one more needed for sentinel TSO workaround */
static int
ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)