* packet seems disappeared after vxlan_rcv/gro_cells_receive/napi_schedule(&cell->napi)
@ 2021-06-09 23:50 Vincent Li
2021-06-11 23:05 ` Vincent Li
0 siblings, 1 reply; 2+ messages in thread
From: Vincent Li @ 2021-06-09 23:50 UTC (permalink / raw)
To: netdev
Hi Experts,
I am doing a tunnel communication test between Cilium eBPF tunnel and
Linux VXLAN vni key based tunnel device (to simulate BIG-IP VXLAN vni
key based device), https://github.com/cilium/cilium/issues/16462
I came across a problem when packet is handled by
vxlan_rcv->gro_cells_receive->napi_schedule(&cell->napi), the packet
seems getting dropped somewhere after that. I suspect I might have
done something wrong to setup the VXLAN device.
Here is how I setup the vxlan device test on my Centos 8 with most
recent mainline git kernel build (5.13.0-rc4+ )
====start of the script====
#!/bin/bash
ip link add vxlan666 type vxlan id 666 dstport 8472 local
10.169.72.236 dev ens192 nolearning l2miss l3miss proxy
ip link set vxlan666 up
ip a add 10.0.4.236/24 dev vxlan666
ip route add 10.0.1.0/24 dev vxlan666 proto kernel scope link src 10.0.4.236
arp -i vxlan666 -s 10.0.1.17 6a:29:d2:78:63:7d
bridge fdb append 6a:29:d2:78:63:7d dst 10.169.72.238 dev vxlan666
====end of the script====
then I run tcpdump in the background
#tcpdump -nn -e -i vxlan666 &
and start to ping the IP 10.0.1.17 which is a POD IP in Cilium managed
K8S cluster
#ping -c 1 10.0.1.17
PING 10.0.1.17 (10.0.1.17) 56(84) bytes of data.
19:06:44.452994 d6:04:7c:b2:93:54 > 6a:29:d2:78:63:7d, ethertype IPv4
(0x0800), length 98: 10.0.4.236 > 10.0.1.17: ICMP echo request, id
1522, seq 1, length 64
19:06:44.454515 56:3d:9c:3a:09:78 > b2:1c:3c:57:9e:97, ethertype IPv4
(0x0800), length 98: 10.0.1.17 > 10.0.4.236: ICMP echo reply, id 1522,
seq 1, length 64
^C
--- 10.0.1.17 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms
You can see the tcpdump shows ICMP echo reply, but ping did not get
the ICMP echo reply and shows 100% packet loss.
I added netdev_info log below and I can see the kernel log:
@@ -35,13 +39,17 @@ int gro_cells_receive(struct gro_cells *gcells,
struct sk_buff *skb)
}
__skb_queue_tail(&cell->napi_skbs, skb);
- if (skb_queue_len(&cell->napi_skbs) == 1)
+ if (skb_queue_len(&cell->napi_skbs) == 1) {
+ netdev_info(skb->dev, "gro_cells_receive: napi_schedule\n");
napi_schedule(&cell->napi);
+ }
+ netdev_info(skb->dev, "gro_cells_receive: NET_RX_SUCCESS\n");
res = NET_RX_SUCCESS;
Jun 9 19:06:44 kernel-dev kernel: vxlan666: gro_cells_receive: napi_schedule
Jun 9 19:06:44 kernel-dev kernel: vxlan666: gro_cells_receive: NET_RX_SUCCESS
I don't know where I have done wrong, any help is appreciated ! :)
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: packet seems disappeared after vxlan_rcv/gro_cells_receive/napi_schedule(&cell->napi)
2021-06-09 23:50 packet seems disappeared after vxlan_rcv/gro_cells_receive/napi_schedule(&cell->napi) Vincent Li
@ 2021-06-11 23:05 ` Vincent Li
0 siblings, 0 replies; 2+ messages in thread
From: Vincent Li @ 2021-06-11 23:05 UTC (permalink / raw)
To: netdev
Just reply myself for conclusion, I figured out the problem in
https://github.com/cilium/cilium/issues/16462#issuecomment-859680801
On Wed, Jun 9, 2021 at 4:50 PM Vincent Li <vincent.mc.li@gmail.com> wrote:
>
> Hi Experts,
>
> I am doing a tunnel communication test between Cilium eBPF tunnel and
> Linux VXLAN vni key based tunnel device (to simulate BIG-IP VXLAN vni
> key based device), https://github.com/cilium/cilium/issues/16462
>
> I came across a problem when packet is handled by
> vxlan_rcv->gro_cells_receive->napi_schedule(&cell->napi), the packet
> seems getting dropped somewhere after that. I suspect I might have
> done something wrong to setup the VXLAN device.
>
> Here is how I setup the vxlan device test on my Centos 8 with most
> recent mainline git kernel build (5.13.0-rc4+ )
>
> ====start of the script====
> #!/bin/bash
>
>
> ip link add vxlan666 type vxlan id 666 dstport 8472 local
> 10.169.72.236 dev ens192 nolearning l2miss l3miss proxy
>
> ip link set vxlan666 up
>
> ip a add 10.0.4.236/24 dev vxlan666
>
> ip route add 10.0.1.0/24 dev vxlan666 proto kernel scope link src 10.0.4.236
>
> arp -i vxlan666 -s 10.0.1.17 6a:29:d2:78:63:7d
>
> bridge fdb append 6a:29:d2:78:63:7d dst 10.169.72.238 dev vxlan666
>
> ====end of the script====
>
> then I run tcpdump in the background
>
> #tcpdump -nn -e -i vxlan666 &
>
> and start to ping the IP 10.0.1.17 which is a POD IP in Cilium managed
> K8S cluster
>
> #ping -c 1 10.0.1.17
>
>
> PING 10.0.1.17 (10.0.1.17) 56(84) bytes of data.
>
> 19:06:44.452994 d6:04:7c:b2:93:54 > 6a:29:d2:78:63:7d, ethertype IPv4
> (0x0800), length 98: 10.0.4.236 > 10.0.1.17: ICMP echo request, id
> 1522, seq 1, length 64
>
> 19:06:44.454515 56:3d:9c:3a:09:78 > b2:1c:3c:57:9e:97, ethertype IPv4
> (0x0800), length 98: 10.0.1.17 > 10.0.4.236: ICMP echo reply, id 1522,
> seq 1, length 64
>
>
> ^C
>
> --- 10.0.1.17 ping statistics ---
>
> 1 packets transmitted, 0 received, 100% packet loss, time 0ms
>
> You can see the tcpdump shows ICMP echo reply, but ping did not get
> the ICMP echo reply and shows 100% packet loss.
>
> I added netdev_info log below and I can see the kernel log:
>
> @@ -35,13 +39,17 @@ int gro_cells_receive(struct gro_cells *gcells,
> struct sk_buff *skb)
>
> }
>
>
> __skb_queue_tail(&cell->napi_skbs, skb);
> - if (skb_queue_len(&cell->napi_skbs) == 1)
> + if (skb_queue_len(&cell->napi_skbs) == 1) {
> + netdev_info(skb->dev, "gro_cells_receive: napi_schedule\n");
> napi_schedule(&cell->napi);
> + }
> + netdev_info(skb->dev, "gro_cells_receive: NET_RX_SUCCESS\n");
> res = NET_RX_SUCCESS;
>
> Jun 9 19:06:44 kernel-dev kernel: vxlan666: gro_cells_receive: napi_schedule
>
> Jun 9 19:06:44 kernel-dev kernel: vxlan666: gro_cells_receive: NET_RX_SUCCESS
>
>
> I don't know where I have done wrong, any help is appreciated ! :)
^ permalink raw reply [flat|nested] 2+ messages in thread
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