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net: dump more useful information in netdev_rx_csum_fault()

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Currently netdev_rx_csum_fault() only shows a device name,
we need more information about the skb for debugging csum
failures.

Sample output:

 ens3: hw csum failure
 dev features: 0x0000000000014b89
 skb len=84 data_len=0 pkt_type=0 gso_size=0 gso_type=0 nr_frags=0 ip_summed=0 csum=0 csum_complete_sw=0 csum_valid=0 csum_level=0

Note, I use pr_err() just to be consistent with the existing one.

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2018-11-12 14:47:18 -08:00 • committed by David S. Miller
parent ddc49acb65
commit 7fe50ac83f
5 changed files with 16 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

11
net/core/dev.c
View file

@ -3091,10 +3091,17 @@ EXPORT_SYMBOL(__skb_gso_segment);
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb)
{
if (net_ratelimit()) {
pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
if (dev)
pr_err("dev features: %pNF\n", &dev->features);
pr_err("skb len=%u data_len=%u pkt_type=%u gso_size=%u gso_type=%u nr_frags=%u ip_summed=%u csum=%x csum_complete_sw=%d csum_valid=%d csum_level=%u\n",
skb->len, skb->data_len, skb->pkt_type,
skb_shinfo(skb)->gso_size, skb_shinfo(skb)->gso_type,
skb_shinfo(skb)->nr_frags, skb->ip_summed, skb->csum,
skb->csum_complete_sw, skb->csum_valid, skb->csum_level);
dump_stack();
}
}
@ -5781,7 +5788,7 @@ __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
if (likely(!sum)) {
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
!skb->csum_complete_sw)
netdev_rx_csum_fault(skb->dev);
netdev_rx_csum_fault(skb->dev, skb);
}
NAPI_GRO_CB(skb)->csum = wsum;