Hi Raj, There are no explicit vcl apis that allow a udp listener to be switched to connected mode. We might decide to do this at one point through a new bind api (non-posix like) since we do support this for builtin applications.
However, you now have the option of connecting a bound session. That is, on the first received packet on a udp listener, you can grab the peer’s address and connect it. Iperf3 in udp mode, which is part of our make test infra, does exactly that. Subsequently, it re-binds the port to accept more connections. Would that work for you? Regards, Florin > On May 15, 2020, at 4:06 PM, Raj Kumar <raj.gauta...@gmail.com> wrote: > > Thanks! Florin, > > OK, I understood that I need to change my application to use UDP socket and > then use vppcom_session_connect(). > This is fine for the UDP client ( sender) . > > But ,in UDP Server ( receiver) , I am not sure how to use the > vppcom_session_connect(). . > I am using vppcom_session_listen() to listen on the connections and then > calling vppcom_session_accept() to accept a new connection. > > With UDPC, I was able to utilize the RSS ( receiver side scaling) feature to > move the received connections on the different cores /threads. > > Just want to confirm if I can achieve the same with UDP. > > I will change my application and will update you about the result. > > Thanks, > -Raj > > > On Fri, May 15, 2020 at 5:17 PM Florin Coras <fcoras.li...@gmail.com > <mailto:fcoras.li...@gmail.com>> wrote: > Hi Raj, > > We removed udpc transport in vpp. I’ll push a patch that removes it from vcl > as well. > > Calling connect on a udp connection will give you connected semantics now. > Let me know if that solves the issue for you. > > Regards, > Florin > > >> On May 15, 2020, at 12:15 PM, Raj Kumar <raj.gauta...@gmail.com >> <mailto:raj.gauta...@gmail.com>> wrote: >> >> Hi, >> I am getting segmentation fault in VPP when using VCL VPPCOM_PROTO_UDPC >> socket. This issue is observed with both UDP sender and UDP receiver >> application. >> >> However, both UDP sender and receiver works fine with VPPCOM_PROTO_UDP. >> >> Here is the stack trace - >> >> (gdb) bt >> #0 0x0000000000000000 in ?? () >> #1 0x00007ffff775da59 in session_open_vc (app_wrk_index=1, >> rmt=0x7fffb5e34cc0, opaque=0) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vnet/session/session.c:1217 >> #2 0x00007ffff7779257 in session_mq_connect_handler (data=0x7fffb676e7a8) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vnet/session/session_node.c:138 >> #3 0x00007ffff7780f48 in session_event_dispatch_ctrl (elt=0x7fffb643f51c, >> wrk=0x7fffb650a640) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vnet/session/session.h:262 >> #4 session_queue_node_fn (vm=<optimized out>, node=<optimized out>, >> frame=<optimized out>) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vnet/session/session_node.c:1409 >> #5 0x00007ffff6b214c1 in dispatch_node (last_time_stamp=<optimized out>, >> frame=0x0, dispatch_state=VLIB_NODE_STATE_POLLING, >> type=VLIB_NODE_TYPE_INPUT, node=0x7fffb5a9a980, vm=0x7ffff6d7c200 >> <vlib_global_main>) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vlib/main.c:1235 >> #6 vlib_main_or_worker_loop (is_main=1, vm=0x7ffff6d7c200 >> <vlib_global_main>) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vlib/main.c:1815 >> #7 vlib_main_loop (vm=0x7ffff6d7c200 <vlib_global_main>) at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vlib/main.c:1990 >> #8 vlib_main (vm=<optimized out>, vm@entry=0x7ffff6d7c200 >> <vlib_global_main>, input=input@entry=0x7fffb5e34fa0) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vlib/main.c:2236 >> #9 0x00007ffff6b61756 in thread0 (arg=140737334723072) at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vlib/unix/main.c:658 >> #10 0x00007ffff602fc0c in clib_calljmp () from /lib64/libvppinfra.so.20.05 >> #11 0x00007fffffffd1e0 in ?? () >> #12 0x00007ffff6b627ed in vlib_unix_main (argc=<optimized out>, >> argv=<optimized out>) >> at >> /usr/src/debug/vpp-20.05-rc0~748_g83d129837.x86_64/src/vlib/unix/main.c:730 >> >> Earlier , I tested this functionality with VPP 20.01 release with the >> following patches and it worked perfectly. >> https://gerrit.fd.io/r/c/vpp/+/24332 <https://gerrit.fd.io/r/c/vpp/+/24332> >> https://gerrit.fd.io/r/c/vpp/+/24334 <https://gerrit.fd.io/r/c/vpp/+/24334> >> https://gerrit.fd.io/r/c/vpp/+/24462 <https://gerrit.fd.io/r/c/vpp/+/24462> >> >> Thanks, >> -Raj >> >
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