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authorGuo-Fu Tseng <cooldavid@cooldavid.org>2011-02-13 19:27:17 +0000
committerDavid S. Miller <davem@davemloft.net>2011-02-13 21:44:43 -0800
commitc00cd82641023ade3c44b4f11140a8afad460415 (patch)
treeebabaf3e94536309efbfea8f0079d951db2b9114 /drivers/net/jme.c
parent8b53abae582cee9a17320460e0f05474097192b6 (diff)
jme: Don't show UDP Checksum error if HW misjudged
Some JMicron Chip treat 0 as error checksum for UDP packets. Which should be "No checksum needed". Reported-by: Adam Swift <Adam.Swift@omnitude.net> Confirmed-by: "Aries Lee" <arieslee@jmicron.com> Signed-off-by: Guo-Fu Tseng <cooldavid@cooldavid.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/jme.c')
-rw-r--r--drivers/net/jme.c32
1 files changed, 29 insertions, 3 deletions
diff --git a/drivers/net/jme.c b/drivers/net/jme.c
index ed35e17f43dc..5b441b75e138 100644
--- a/drivers/net/jme.c
+++ b/drivers/net/jme.c
@@ -956,8 +956,34 @@ jme_disable_rx_engine(struct jme_adapter *jme)
jme_mac_rxclk_off(jme);
}
+static u16
+jme_udpsum(struct sk_buff *skb)
+{
+ u16 csum = 0xFFFFu;
+
+ if (skb->len < (ETH_HLEN + sizeof(struct iphdr)))
+ return csum;
+ if (skb->protocol != htons(ETH_P_IP))
+ return csum;
+ skb_set_network_header(skb, ETH_HLEN);
+ if ((ip_hdr(skb)->protocol != IPPROTO_UDP) ||
+ (skb->len < (ETH_HLEN +
+ (ip_hdr(skb)->ihl << 2) +
+ sizeof(struct udphdr)))) {
+ skb_reset_network_header(skb);
+ return csum;
+ }
+ skb_set_transport_header(skb,
+ ETH_HLEN + (ip_hdr(skb)->ihl << 2));
+ csum = udp_hdr(skb)->check;
+ skb_reset_transport_header(skb);
+ skb_reset_network_header(skb);
+
+ return csum;
+}
+
static int
-jme_rxsum_ok(struct jme_adapter *jme, u16 flags)
+jme_rxsum_ok(struct jme_adapter *jme, u16 flags, struct sk_buff *skb)
{
if (!(flags & (RXWBFLAG_TCPON | RXWBFLAG_UDPON | RXWBFLAG_IPV4)))
return false;
@@ -970,7 +996,7 @@ jme_rxsum_ok(struct jme_adapter *jme, u16 flags)
}
if (unlikely((flags & (RXWBFLAG_MF | RXWBFLAG_UDPON | RXWBFLAG_UDPCS))
- == RXWBFLAG_UDPON)) {
+ == RXWBFLAG_UDPON) && jme_udpsum(skb)) {
if (flags & RXWBFLAG_IPV4)
netif_err(jme, rx_err, jme->dev, "UDP Checksum error\n");
return false;
@@ -1018,7 +1044,7 @@ jme_alloc_and_feed_skb(struct jme_adapter *jme, int idx)
skb_put(skb, framesize);
skb->protocol = eth_type_trans(skb, jme->dev);
- if (jme_rxsum_ok(jme, le16_to_cpu(rxdesc->descwb.flags)))
+ if (jme_rxsum_ok(jme, le16_to_cpu(rxdesc->descwb.flags), skb))
skb->ip_summed = CHECKSUM_UNNECESSARY;
else
skb_checksum_none_assert(skb);