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 <mallikarjuna.chilakala@xxxxxxxxx>
Signed-off-by: Ganesh Venkatesan <ganesh.venkatesan@xxxxxxxxx>
Signed-off-by: John Ronciak <john.ronciak@xxxxxxxxx>
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 2005-04-12
23:00:53.000000000 -0700
+++ net-drivers-2.4/drivers/net/e1000.new/e1000_main.c 2005-04-12
23:00:55.000000000 -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,
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