From: Malli Chilakala Date: Fri, 29 Apr 2005 02:41:46 +0000 (-0700) Subject: [PATCH] e1000: Implement a workaround for 82546 errata 10 X-Git-Tag: v2.6.12-rc6~160^2~3^2~6 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97338bde27d97347bc83203d6ac5e93be1ebcd03;p=linux-2.6 [PATCH] e1000: Implement a workaround for 82546 errata 10 Implement 82546 errata 10 -- first Tx descriptor cannot have more than 2015 byte of data in it or it could hang the transmitter. Signed-off-by: Mallikarjuna R Chilakala Signed-off-by: Ganesh Venkatesan Signed-off-by: John Ronciak diff -up net-drivers-2.6/drivers/net/e1000/e1000_main.c net-drivers-2.6/drivers/net/e1000.new/e1000_main.c --- diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index 479915a9f0..e54890aff5 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -1777,6 +1777,15 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb, if(unlikely(mss && !nr_frags && size == len && size > 8)) size -= 4; #endif + /* work-around for errata 10 and it applies + * to all controllers in PCI-X mode + * The fix is to make sure that the first descriptor of a + * packet is smaller than 2048 - 16 - 16 (or 2016) bytes + */ + if(unlikely((adapter->hw.bus_type == e1000_bus_type_pcix) && + (size > 2015) && count == 0)) + size = 2015; + /* Workaround for potential 82544 hang in PCI-X. Avoid * terminating buffers within evenly-aligned dwords. */ if(unlikely(adapter->pcix_82544 && @@ -1979,6 +1988,13 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev) if(adapter->pcix_82544) count++; + /* work-around for errata 10 and it applies to all controllers + * in PCI-X mode, so add one more descriptor to the count + */ + if(unlikely((adapter->hw.bus_type == e1000_bus_type_pcix) && + (len > 2015))) + count++; + nr_frags = skb_shinfo(skb)->nr_frags; for(f = 0; f < nr_frags; f++) count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size,