<div dir="ltr">Sorry I replied privately. I am replying here again. WIth the KNI, I have a listener listener as follows: static void *kni_monitor_system_networking(void *data) { struct mnl_socket *nl; char buf[MNL_SOCKET_BUFFER_SIZE]; int ret; nl = mnl_socket_open(NETLINK_ROUTE); if (nl == NULL) { perror("mnl_socket_open"); exit(EXIT_FAILURE); } if (mnl_socket_bind(nl, RTMGRP_LINK | RTMGRP_IPV4_IFADDR, MNL_SOCKET_AUTOPID) < 0) { perror("mnl_socket_bind"); exit(EXIT_FAILURE); } ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); while (ret > 0) { ret = mnl_cb_run(buf, ret, 0, 0, data_cb, NULL); if (ret <= 0) break; ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); } if (ret == -1) { perror("error"); exit(EXIT_FAILURE); } mnl_socket_close(nl); return 0; } But also I have a thread looping over rte_kni_handle_request: while (1) { for (t = kni_tracker; t; t = t->next) { struct rte_kni *kni = ( struct rte_kni * )t->kni; if (ppo->kni) { rte_kni_handle_request(kni); } usleep(10000); } The rte_kni_handle_request calls the kni_config_promiscusity. So from what you are saying, I can replace this call with another monitor on the netlink ports (the work will be on finding the correct flags and to implement the callback I guess)? I from what I see, mnl_socket_bind(nl, RTMGRP_LINK | RTMGRP_IPV4_IFADDR, MNL_SOCKET_AUTOPID) < 0) this linke should get also requests that are link related, but it doesn't seem to get any packets when I use tcpdump on the interface.</div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 23, 2023 at 5:23 PM Stephen Hemminger <<a href="mailto:stephen@networkplumber.org">stephen@networkplumber.org</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Tue, 23 May 2023 16:46:24 +0100 Igor de Paula <<a href="mailto:igordptx@gmail.com" target="_blank">igordptx@gmail.com</a>> wrote: > Hi, > I am running the DPDK version: 21.08.0 and Ubuntu 20.04.3 LTS. > I have an application that uses KNI to interface with the kernel. > I want to replace it with virtio_user ports as KNI will be deprecated in > the future. > Most of the functionality I am able to replace but there is one thing I am > struggling with. > In KNI we can add functions that will be called in case the network stack > makes a request. The following code shows this: > struct rte_kni *kni; > struct rte_kni_conf conf; > struct rte_kni_ops ops; > struct rte_eth_dev_info dev_info; > int ret; > /* Clear conf at first */ > memset(&conf, 0, sizeof(conf)); > conf.core_id = 0; > memset(&ops, 0, sizeof(ops)); > ops.port_id = ppo->id; > ops.config_promiscusity = ippe_ppo_set_kni_promiscuous_mode; > ops.change_mtu = ippe_ppo_set_kni_mtu; > ops.config_network_if = ippe_ppo_set_kni_interface; > ops.config_mac_address = ippe_ppo_set_kni_mac_address; > kni = rte_kni_alloc(pktmbuf_pool[0], &conf, &ops); > > > And there is a handle_request function supplied by KNI that calls these > functions when need be, > I haven't found any documentation on how to replace this functionality. I > am no expert in how to set up and interact with the kernel stack, Some help > on how to achieve this would be appreciated. If you want to handle changes to kernel network device, then you will have to build a netlink listener that monitors these changes. </blockquote></div>