Hi Florin,
*I am using vpp 25.02. vcl app is in a pod and vpp is in diff pod.*
i added vcl config :
vcl {
app-scope-global
app-scope-local
*app-socket-api /var/run/vpp/app_ns_sockets/default*
use-mq-eventfd
event-queue-size 10000
rx-fifo-size 512000
tx-fifo-size 512000
namespace-id vcl
namespace-secret 123456
}
vpp startup config:
removed: socksvr { socket-name /var/run/pw/vpp-api.sock}
*added: session { use-app-socket-api enable }*
*after this i got below error:*vls_app_create_nochild failed rv= -1
Thanks,
Praveen
On Mon, Dec 8, 2025 at 10:05 PM Florin Coras via lists.fd.io <fcoras.lists=
[email protected]> wrote:
> Hi Praveen,
>
> api-socket-name (binary api) should be replaced by app-socket-name (host
> stack specific app socket api). VPP needs to be configured to enable it in
> startup.conf (use-app-socket-api). Point with this being that I’d like to
> confirm it’s not a bapi specific issue.
>
> Regards,
> Florin
>
> On Dec 7, 2025, at 11:26 PM, Praveen Singh via lists.fd.io <praveen.553=
> [email protected]> wrote:
>
> Hi Florin,
> I am using api socket only. Below is the vcl config.
> *cat /etc/vpp/vcl.conf*
> vcl {
> app-scope-global
> app-scope-local
> *api-socket-name /var/run/pw/vpp-api.sock*
> use-mq-eventfd
> event-queue-size 10000
> rx-fifo-size 512000
> tx-fifo-size 512000
> namespace-id vcl
> namespace-secret 123456
> }
>
> Thanks,
> Praveen
>
> On Mon, Dec 8, 2025 at 12:43 PM Florin Coras via lists.fd.io
> <[email protected]> wrote:
>
>> Hi Praveen,
>>
>> On Dec 7, 2025, at 10:06 PM, Praveen Singh via lists.fd.io <praveen.553=
>> [email protected]> wrote:
>>
>> Hi Florin,
>> I ran the app with root permission only, still getting same error message.
>>
>> if (vl_socket_client_recv_fd_msg2 (&wrk->bapi_sock_ctx, fds, mp->n_fds,
>> 5))
>> goto failed;
>> clib_warning("Praveen wrk->bapi_sock_ctx.socket_fd %d fds %d
>> mp->n_fds %d ", wrk->bapi_sock_ctx.socket_fd, fds,mp->n_fds);
>>
>> Below is the output:
>> vl_api_app_attach_reply_t_handler:87: Praveen
>> wrk->bapi_sock_ctx.socket_fd 6 fds 1694124968 mp->n_fds 3
>>
>>
>> Could you also try with app socket api. For config example see here [1]
>>
>> Regards,
>> Florin
>>
>> [1] https://wiki.fd.io/view/VPP/HostStack/LDP/iperf
>>
>>
>> Thanks,
>> Praveen
>>
>> On Thu, Nov 20, 2025 at 11:05 AM Florin Coras via lists.fd.io
>> <[email protected]> wrote:
>>
>>> Hi Praveen,
>>>
>>> Inline.
>>>
>>> On Nov 19, 2025, at 9:19 PM, Praveen Singh via lists.fd.io <praveen.553=
>>> [email protected]> wrote:
>>>
>>> Hi Florin,
>>> Thank you for your reply. Here is the additional log which I printed.
>>> VCL<2105>: configured namespace_id vcl
>>> VCL<2105>: configured namespace_secret 123456 (0x1e240)
>>> VCL<2105>: completed parsing vppcom config!
>>> vppcom_app_create:1503: vcl<0:-1>: Allocate default worker
>>> vcl_worker_alloc_and_init:287: vcl<2105:0>: Praveen: worker index 0,
>>> worker mqs_epfd 5, wrk->app_api_sock.fd
>>> clib_socket_init:639: Praveen: socket (fd 6, '/var/run/pw/vpp-api.sock')
>>> vcl_bapi_connect_to_vpp:558: vcl<2105:0>: app (test-wrk-0) is connected
>>> to VPP!
>>> vcl_bapi_init:663: vcl<2105:0>: sending session enable
>>>
>>> *vcl_mq_epoll_add_api_sock:54: vcl<2105:0>: created cs->fd=0
>>> wrk->mqs_epfd 5 errno=1 (Operation not permitted) rv -1*
>>>
>>>
>>> This is used to track vpp’s status. So not critical unless you want vcl
>>> to reattach after vpp restarts.
>>>
>>>
>>> *vcl_mq_epoll_add_evfd:93: vcl<2105:0>: created mqs_epfd=10
>>> wrk->mqs_epfd 5 errno=1 (Operation not permitted)*
>>>
>>>
>>> This is used by vpp to signal the presence of new events in the message
>>> queue to vcl. If “mqs_epfd” is actually “mq_fd” in that function, the value
>>> looks reasonable. Maybe this is really a permission problem. Have you tried
>>> running the app as root?
>>>
>>> Regards,
>>> Florin
>>>
>>> *vppcom_app_create:1513: vcl<2105:0>: app_name 'test', my_client_index
>>> 1280 (0x500)*
>>> DEBUG: vcl_app_create_wrapper: VCL app creation - app_name=test, ret=0
>>> vppcom_session_create:1572: vcl<2105:0>: created session 0
>>> DEBUG: vcl_socket_wrapper: VCL socket created - domain=2, type=2,
>>> proto=17, options=2, sockfd=0, errno=0 (Success)
>>> DEBUG: vcl_bind_wrapper: === BIND OPERATION START ===
>>> DEBUG: vcl_bind_wrapper: sockfd=0, addrlen=16
>>> vppcom_session_bind:1767: vcl<2105:0>: session 0 handle 0: binding to
>>> local IPv4 address 10.166.220.80 port 862, proto UDP
>>> vppcom_session_listen:1796: vcl<2105:0>: session 0: sending vpp listen
>>> request...
>>> vcl_send_session_listen:75: vcl_send_session_listen: vnode id:0 thread
>>> id:0 clt:1280 wrk:0 port:24067 proto:1
>>> vcl_session_app_add_segment_handler:992: vcl<2105:0>: mapped new segment
>>> 'seg-5-6-52' size 134230016
>>> vcl_session_bound_handler:602: vcl<2105:0>: session 0 [0xf]: listen
>>> succeeded!
>>> DEBUG: vcl_bind_wrapper: VCL bind result - sockfd=0, ret=0, errno=0
>>> (Success)
>>> DEBUG: vcl_bind_wrapper: VCL bind successful - sockfd=0
>>>
>>> One more question, What is the impact of the below error?
>>> vcl_mq_epoll_add_evfd:90: vcl<118:0>: failed to add mq socket to mq
>>> epoll fd
>>>
>>> Thanks,
>>> Praveen
>>>
>>> On Thu, Nov 20, 2025 at 1:19 AM Florin Coras via lists.fd.io
>>> <[email protected]> wrote:
>>>
>>>> Hi Praveen,
>>>>
>>>> You’d probably have to check the exact reason why epoll_ctl fails. But
>>>> some quick comments:
>>>> - we’re moving away from binary api in vcl. We’re still building it but
>>>> it’s slowly being deprecated. I’d recommend switching to sapi api.
>>>> - maybe check vl_api_app_attach_reply_t_handler and confirm that
>>>> wrk->app_event_queue fd we got from vl_socket_client_recv_fd_msg2 is
>>>> reasonable.
>>>>
>>>> Regards,
>>>> Florin
>>>>
>>>> > On Nov 18, 2025, at 7:59 PM, Praveen Singh via lists.fd.io
>>>> <[email protected]> wrote:
>>>> >
>>>> > Hi All,
>>>> > When i connected my vcl app, i got below error. any input on below
>>>> error?
>>>> > <inline.0.part>
>>>> >
>>>> >
>>>> >
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
>
>
>
>
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