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jme: Don't show UDP Checksum error if HW misjudged

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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>
This commit is contained in:
Guo-Fu Tseng 2011-02-13 19:27:17 +00:00 committed by David S. Miller
parent 8b53abae58
commit c00cd82641
1 changed files with 29 additions and 3 deletions
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32
drivers/net/jme.c
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@ -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);