From: Malli Chilakala Date: Fri, 29 Apr 2005 01:51:54 +0000 (-0700) Subject: [PATCH] ixgb: Reset status in the Rx X-Git-Tag: v2.6.12-rc6~160^2~2^2~6 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=41639fed1b32dde4ea3d94242a89308435d341be;p=~emulex%2Finfiniband.git [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 Signed-off-by: Ganesh Venkatesan Signed-off-by: John Ronciak diff -up net-drivers-2.6/drivers/net/ixgb/ixgb_main.c net-drivers-2.6/drivers/net/ixgb.new/ixgb_main.c --- diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c index da6b9d6e6db..a6a13f6fe65 100644 --- a/drivers/net/ixgb/ixgb_main.c +++ b/drivers/net/ixgb/ixgb_main.c @@ -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