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| author | Malli Chilakala <mallikarjuna.chilakala@intel.com> | 2005-04-28 19:41:46 -0700 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-05-12 20:48:54 -0400 |
| commit | 97338bde27d97347bc83203d6ac5e93be1ebcd03 (patch) | |
| tree | a2897ca9e0ea40ef14ea1bcb4af69769021e9414 /drivers/net/e1000 | |
| parent | a4cb847dac40577dd751a4deb4085ed080780679 (diff) | |
| download | kernel_samsung_tuna-97338bde27d97347bc83203d6ac5e93be1ebcd03.zip kernel_samsung_tuna-97338bde27d97347bc83203d6ac5e93be1ebcd03.tar.gz kernel_samsung_tuna-97338bde27d97347bc83203d6ac5e93be1ebcd03.tar.bz2 | |
[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 <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/e1000/e1000_main.c net-drivers-2.6/drivers/net/e1000.new/e1000_main.c
Diffstat (limited to 'drivers/net/e1000')
| -rw-r--r-- | drivers/net/e1000/e1000_main.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index 479915a..e54890a 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, |