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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
authored by Malli Chilakala and committed by Jeff Garzik 41639fed 6dfbb6dd
+6
-2
drivers/net/ixgb/ixgb_main.c
+6
-2
drivers/net/ixgb/ixgb_main.c
···
1977
1978
num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1979
1980
-
/* leave one descriptor unused */
1981
-
while(--cleancount > 0) {
1982
rx_desc = IXGB_RX_DESC(*rx_ring, i);
1983
1984
skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
···
2005
PCI_DMA_FROMDEVICE);
2006
2007
rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2008
2009
if((i & ~(num_group_tail_writes- 1)) == i) {
2010
/* Force memory writes to complete before letting h/w
···
1977
1978
num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1979
1980
+
/* leave three descriptors unused */
1981
+
while(--cleancount > 2) {
1982
rx_desc = IXGB_RX_DESC(*rx_ring, i);
1983
1984
skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
···
2005
PCI_DMA_FROMDEVICE);
2006
2007
rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2008
+
/* guarantee DD bit not set now before h/w gets descriptor
2009
+
* this is the rest of the workaround for h/w double
2010
+
* writeback. */
2011
+
rx_desc->status = 0;
2012
2013
if((i & ~(num_group_tail_writes- 1)) == i) {
2014
/* Force memory writes to complete before letting h/w