I am reading the gre tunnel related codes in ovs.
The fuction "ovs_tnl_send" encapsulates packets coming from vports, then
sends the packets out from a NIC based on a host route entry.
I was puzzled on the paragraph:
********
cache_vport = ovs_internal_dev_get_vport(rt_dst(rt).dev);
skb->protocol = htons(ETH_P_IP);
iph = ip_hdr(skb);
iph->tot_len = htons(skb->len - skb_network_offset(skb));
ip_send_check(iph);
if (cache_vport) {
if (unlikely(compute_ip_summed(skb, true))) {
kfree_skb(skb);
goto next;
}
OVS_CB(skb)->flow = cache->flow;
ovs_vport_receive(cache_vport, skb);--->send to datapath again?
sent_len += orig_len;
} else {------>send to NIC
int xmit_err;
skb->dev = rt_dst(rt).dev;
xmit_err = dev_queue_xmit(skb);
if (likely(net_xmit_eval(xmit_err) == 0))
sent_len += orig_len;
}
**********
The question is when the rt_dst(rt).dev is a internal dev? Why sending the
packet to the datapath again?
Thanks a lot.
---Xing'an_______________________________________________
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