Hi Florin,
Thanks! for the reply.
I realized the issue with the non-connected case. For receiving datagrams,
I was using recvfrom() with DONOT_WAIT flag because of
that vppcom_session_recvfrom() api was failing. It expects either 0 or
MSG_PEEK flag.
if (flags == 0)
rv = vppcom_session_read (session_handle, buffer, buflen);
else if (flags & MSG_PEEK) 0x2
rv = vppcom_session_peek (session_handle, buffer, buflen);
else
{
VDBG (0, "Unsupport flags for recvfrom %d", flags);
return VPPCOM_EAFNOSUPPORT;
}
I changed the flag to 0 in recvfrom() , after that UDP rx is working fine
but only for IPv4.
I am facing a different issue with IPv6/UDP receiver. I am getting "no
listener for dst port" error.
Please let me know if I am doing something wrong.
Here are the traces : -
[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 ./udp6_rx
VCL<1164>: configured VCL debug level (2) from VCL_DEBUG!
VCL<1164>: allocated VCL heap = 0x7ff877439010, size 268435456 (0x10000000)
VCL<1164>: configured rx_fifo_size 4000000 (0x3d0900)
VCL<1164>: configured tx_fifo_size 4000000 (0x3d0900)
VCL<1164>: configured app_scope_local (1)
VCL<1164>: configured app_scope_global (1)
VCL<1164>: configured api-socket-name (/tmp/vpp-api.sock)
VCL<1164>: completed parsing vppcom config!
vppcom_connect_to_vpp:549: vcl<1164:0>: app (ldp-1164-app) is connected to
VPP!
vppcom_app_create:1067: vcl<1164:0>: sending session enable
vppcom_app_create:1075: vcl<1164:0>: sending app attach
vppcom_app_create:1084: vcl<1164:0>: app_name 'ldp-1164-app',
my_client_index 0 (0x0)
ldp_init:209: ldp<1164>: configured LDP debug level (2) from env var
LDP_DEBUG!
ldp_init:282: ldp<1164>: LDP initialization: done!
ldp_constructor:2490: LDP<1164>: LDP constructor: done!
socket:974: ldp<1164>: calling vls_create: proto 1 (UDP), is_nonblocking 0
vppcom_session_create:1142: vcl<1164:0>: created session 0
bind:1086: ldp<1164>: fd 32: calling vls_bind: vlsh 0, addr 0x7fff9a93efe0,
len 28
vppcom_session_bind:1280: vcl<1164:0>: session 0 handle 0: binding to local
IPv6 address :: port 8092, proto UDP
vppcom_session_listen:1312: vcl<1164:0>: session 0: sending vpp listen
request...
vcl_session_bound_handler:610: vcl<1164:0>: session 0 [0x1]: listen
succeeded!
bind:1102: ldp<1164>: fd 32: returning 0
vpp# sh app server
Connection App Wrk
[0:0][CT:U] :::8092->:::0 ldp-1164-app[shm] 0
[#0][U] :::8092->:::0 ldp-1164-app[shm] 0
vpp# sh err
Count Node Reason
7 dpdk-input no error
2606 ip6-udp-lookup no listener for dst port
8 arp-reply ARP replies sent
1 arp-disabled ARP Disabled on this
interface
13 ip6-glean neighbor solicitations
sent
2606 ip6-input valid ip6 packets
4 ip6-local-hop-by-hop Unknown protocol ip6
local h-b-h packets dropped
2606 ip6-icmp-error destination unreachable
response sent
40 ip6-icmp-input valid packets
1 ip6-icmp-input neighbor solicitations
from source not on link
12 ip6-icmp-input neighbor solicitations
for unknown targets
1 ip6-icmp-input neighbor advertisements
sent
1 ip6-icmp-input neighbor advertisements
received
40 ip6-icmp-input router advertisements sent
40 ip6-icmp-input router advertisements
received
1 ip4-icmp-input echo replies sent
89 lldp-input lldp packets received on
disabled interfaces
1328 llc-input unknown llc ssap/dsap
vpp#
vpp# show trace
------------------- Start of thread 0 vpp_main -------------------
Packet 1
00:23:39:401354: dpdk-input
HundredGigabitEthernet12/0/0 rx queue 0
buffer 0x8894e: current data 0, length 1516, buffer-pool 0, ref-count 1,
totlen-nifb 0, trace handle 0x0
ext-hdr-valid
l4-cksum-computed l4-cksum-correct
PKT MBUF: port 0, nb_segs 1, pkt_len 1516
buf_len 2176, data_len 1516, ol_flags 0x180, data_off 128, phys_addr
0x75025400
packet_type 0x2e1 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
Packet Offload Flags
PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
Packet Types
RTE_PTYPE_L2_ETHER (0x0001) Ethernet packet
RTE_PTYPE_L3_IPV6_EXT_UNKNOWN (0x00e0) IPv6 packet with or without
extension headers
RTE_PTYPE_L4_UDP (0x0200) UDP packet
IP6: b8:83:03:79:9f:e4 -> b8:83:03:79:af:8c 802.1q vlan 2001
UDP: fd0d:edc4:ffff:2001::201 -> fd0d:edc4:ffff:2001::203
tos 0x00, flow label 0x0, hop limit 64, payload length 1458
UDP: 60593 -> 8092
length 1458, checksum 0x0964
00:23:39:401355: ethernet-input
frame: flags 0x3, hw-if-index 2, sw-if-index 2
IP6: b8:83:03:79:9f:e4 -> b8:83:03:79:af:8c 802.1q vlan 2001
00:23:39:401356: ip6-input
UDP: fd0d:edc4:ffff:2001::201 -> fd0d:edc4:ffff:2001::203
tos 0x00, flow label 0x0, hop limit 64, payload length 1458
UDP: 60593 -> 8092
length 1458, checksum 0x0964
00:23:39:401357: ip6-lookup
fib 0 dpo-idx 5 flow hash: 0x00000000
UDP: fd0d:edc4:ffff:2001::201 -> fd0d:edc4:ffff:2001::203
tos 0x00, flow label 0x0, hop limit 64, payload length 1458
UDP: 60593 -> 8092
length 1458, checksum 0x0964
00:23:39:401361: ip6-local
UDP: fd0d:edc4:ffff:2001::201 -> fd0d:edc4:ffff:2001::203
tos 0x00, flow label 0x0, hop limit 64, payload length 1458
UDP: 60593 -> 8092
length 1458, checksum 0x0964
00:23:39:401362: ip6-udp-lookup
UDP: src-port 60593 dst-port 8092 (no listener)
00:23:39:401362: ip6-icmp-error
UDP: fd0d:edc4:ffff:2001::201 -> fd0d:edc4:ffff:2001::203
tos 0x00, flow label 0x0, hop limit 64, payload length 1458
UDP: 60593 -> 8092
length 1458, checksum 0x0964
00:23:39:401363: error-drop
rx:HundredGigabitEthernet12/0/0.2001
00:23:39:401364: drop
ip6-input: valid ip6 packets
vpp#
Thanks,
-Raj
On Tue, Jan 14, 2020 at 1:44 PM Florin Coras <fcoras.li...@gmail.com> wrote:
> Hi Raj,
>
> Session layer does support connection-less transports but udp does not
> raise accept notifications to vcl. UDPC might, but we haven’t tested udpc
> with vcl in a long time so it might not work properly.
>
> What was the problem you were hitting in the non-connected case?
>
> Regards,
> Florin
>
> > On Jan 14, 2020, at 7:13 AM, raj.gauta...@gmail.com wrote:
> >
> > 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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