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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-05-17 08:35:36 +0100 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-22 06:19:18 -0400 |
| commit | 5a0a92e67b5009a71e011658da04fb92dad8961f (patch) | |
| tree | 972c08baf56fbd8abfcf5d5854567e846b322e80 /drivers/net/sc92031.c | |
| parent | 789585e968f07653a29a9e829aed20386043636c (diff) | |
| download | lwn-5a0a92e67b5009a71e011658da04fb92dad8961f.tar.gz lwn-5a0a92e67b5009a71e011658da04fb92dad8961f.zip | |
[SC92031] Using padto turned driver into an IPv6-only interface
IPv4 would work with this driver only with static arp table entries,
the patch reverts a padto introduced in
commit 26a17b7bbb36a8552d531bc1ad08472fb5aa3007
sc92031: start transmit return value bugfix
The padto does not work because the driver code evaluates `len' later on and
there are cases where skb->len is not updated accordingly.
This was observed with ARP frames (skb->len = 42 bytes, !skb_cloned(),
skb_tailroom = 84 bytes). Then in skb_pad(), the first condition is true, where
skb->len is not updated. As a consequence, the driver uses 42 bytes instead of
the 60 bytes, and the ARP frame never makes it onto the wire.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/sc92031.c')
| -rw-r--r-- | drivers/net/sc92031.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/sc92031.c b/drivers/net/sc92031.c index f64a860029b7..b4b63805ee8f 100644 --- a/drivers/net/sc92031.c +++ b/drivers/net/sc92031.c @@ -953,9 +953,6 @@ static int sc92031_start_xmit(struct sk_buff *skb, struct net_device *dev) unsigned entry; u32 tx_status; - if (skb_padto(skb, ETH_ZLEN)) - return NETDEV_TX_OK; - if (unlikely(skb->len > TX_BUF_SIZE)) { dev->stats.tx_dropped++; goto out; @@ -975,6 +972,11 @@ static int sc92031_start_xmit(struct sk_buff *skb, struct net_device *dev) skb_copy_and_csum_dev(skb, priv->tx_bufs + entry * TX_BUF_SIZE); len = skb->len; + if (unlikely(len < ETH_ZLEN)) { + memset(priv->tx_bufs + entry * TX_BUF_SIZE + len, + 0, ETH_ZLEN - len); + len = ETH_ZLEN; + } wmb(); |