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[PATCH] ixgb: Reset status in the Rx 

Reset status in the Rx descriptor prior to handing it to the controller.
Leave three Rx descriptors unused

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Ganesh Venkatesan <ganesh.venkatesan@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

diff -up net-drivers-2.6/drivers/net/ixgb/ixgb_main.c net-drivers-2.6/drivers/net/ixgb.new/ixgb_main.c
This commit is contained in:
Malli Chilakala 2005-04-28 18:51:54 -07:00 committed by Jeff Garzik
parent 6dfbb6dd39
commit 41639fed1b
1 changed files with 6 additions and 2 deletions
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8
drivers/net/ixgb/ixgb_main.c
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@ -1977,8 +1977,8 @@ ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
/* leave one descriptor unused */
while(--cleancount > 0) {
/* leave three descriptors unused */
while(--cleancount > 2) {
rx_desc = IXGB_RX_DESC(*rx_ring, i);
skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
@ -2005,6 +2005,10 @@ ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
PCI_DMA_FROMDEVICE);
rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
/* guarantee DD bit not set now before h/w gets descriptor
* this is the rest of the workaround for h/w double
* writeback. */
rx_desc->status = 0;
if((i & ~(num_group_tail_writes- 1)) == i) {
/* Force memory writes to complete before letting h/w