[RESEND][PATCH net-drivers-2.4 10/16] e1000:Implement a workaround for 82546 errata 10 (fwd)
From: Malli Chilakala <hidden>
Date: 2005-04-27 18:11:15
Implement a workaround for 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 <redacted> Signed-off-by: Ganesh Venkatesan <redacted> Signed-off-by: John Ronciak <redacted> diff -up net-drivers-2.4/drivers/net/e1000/e1000_main.c net-drivers-2.4/drivers/net/e1000.new/e1000_main.c
--- net-drivers-2.4/drivers/net/e1000/e1000_main.c 2005-04-1223:00:53.000000000 -0700
+++ net-drivers-2.4/drivers/net/e1000.new/e1000_main.c 2005-04-1223:00:55.000000000 -0700
@@ -1750,6 +1750,15 @@ e1000_tx_map(struct e1000_adapter *adapt 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 &&
@@ -1951,6 +1960,13 @@ e1000_xmit_frame(struct sk_buff *skb, st 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,