From: we...@ucloud.cn
Date: Tue, 15 Jan 2019 10:44:35 +0800
> + tun_info = skb_tunnel_info(skb);
> + if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) &&
> + ip_tunnel_info_af(tun_info) == AF_INET &&
> + tun_info->key.u.ipv4.dst) {
> + struct iphdr tnl_params_info;
> +
> + memcpy(&tnl_params_info, tnl_params,
> + sizeof(tnl_params_info));
It is not at all reasonable to build and memcpy an entire extra iphdr
on the cpu stack, for every packet transmit. That's terrible for
performance.
Please find a more minimal and efficient way to achieve the behavior
you are looking for.
Thank you.
