Hi , I am trying some host application tests ( using LD_PRELOAD) . TCP rx and tx both work fine. UDP tx also works fine. The issue is only with UDP rx . In some discussion it was mentioned that session layer does not support connection-less transports so protocols like udp still need to accept connections and only afterwards read from the fifos. So, I changed the UDP receiver application to use listen() and accept() before read() . But , I am still having issue to make it run. After I started, udp traffic from other server it seems to accept the connection but never returns from the vppcom_session_accept() function. VPP release is 19.08.
vpp# sh app server Connection App Wrk [0:0][CT:U] 0.0.0.0:8090->0.0.0.0:0 ldp-36646-app[shm] 0 [#0][U] 0.0.0.0:8090->0.0.0.0:0 ldp-36646-app[shm] 0 vpp# [root@orc01 testcode]# VCL_DEBUG=2 LDP_DEBUG=2 LD_PRELOAD=/opt/vpp/build-root/install-vpp-native/vpp/lib/libvcl_ldpreload.so VCL_CONFIG=/etc/vpp/vcl.cfg ./udp_rx VCL<36646>: configured VCL debug level (2) from VCL_DEBUG! VCL<36646>: allocated VCL heap = 0x7f77e5309010, size 268435456 (0x10000000) VCL<36646>: configured rx_fifo_size 4000000 (0x3d0900) VCL<36646>: configured tx_fifo_size 4000000 (0x3d0900) VCL<36646>: configured app_scope_local (1) VCL<36646>: configured app_scope_global (1) VCL<36646>: configured api-socket-name (/tmp/vpp-api.sock) VCL<36646>: completed parsing vppcom config! vppcom_connect_to_vpp:549: vcl<36646:0>: app (ldp-36646-app) is connected to VPP! vppcom_app_create:1067: vcl<36646:0>: sending session enable vppcom_app_create:1075: vcl<36646:0>: sending app attach vppcom_app_create:1084: vcl<36646:0>: app_name 'ldp-36646-app', my_client_index 0 (0x0) ldp_init:209: ldp<36646>: configured LDP debug level (2) from env var LDP_DEBUG! ldp_init:282: ldp<36646>: LDP initialization: done! ldp_constructor:2490: LDP<36646>: LDP constructor: done! socket:974: ldp<36646>: calling vls_create: proto 1 (UDP), is_nonblocking 0 vppcom_session_create:1142: vcl<36646:0>: created session 0 Socket successfully created.. bind:1086: ldp<36646>: fd 32: calling vls_bind: vlsh 0, addr 0x7fff3f3c1040, len 16 vppcom_session_bind:1280: vcl<36646:0>: session 0 handle 0: binding to local IPv4 address 0.0.0.0 port 8090, proto UDP vppcom_session_listen:1312: vcl<36646:0>: session 0: sending vpp listen request... vcl_session_bound_handler:610: vcl<36646:0>: session 0 [0x1]: listen succeeded! bind:1102: ldp<36646>: fd 32: returning 0 Socket successfully binded.. listen:2005: ldp<36646>: fd 32: calling vls_listen: vlsh 0, n 5 vppcom_session_listen:1308: vcl<36646:0>: session 0 [0x1]: already in listen state! listen:2020: ldp<36646>: fd 32: returning 0 Server listening.. ldp_accept4:2043: ldp<36646>: listen fd 32: calling vppcom_session_accept: listen sid 0, ep 0x0, flags 0x3f3c0fc0 vppcom_session_accept:1478: vcl<36646:0>: discarded event: 0
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