Hi Wei,
I suspect you wanted to register CREATE_LOOPBACK_REPLY instead of
CREATE_LOOPBACK in foreach_vpe_api_reply_msg
Regards,
Florin
> On Mar 7, 2022, at 9:07 AM, Wei Huang <wei.hu.hu...@oracle.com> wrote:
>
> I used the following program to test API functions. For sw_interface_dump, I
> got the reply with all the interfaces information, but for the
> create_loopback message, I don't get any reply, although the loopback is
> successfully created. I also tried ip_route_add_del, ip_route_add_del_v2,
> same thing, the reply handler function never got called.
> Anybody knows why the reply handler not get called?
>
> Thanks,
> Wei
> =========================================
> #include <stdio.h>
>
> #include <vlibmemory/api.h>
> #include <svm/fifo_segment.h>
> #include <svm/message_queue.h>
> #include <vpp/api/vpe_msg_enum.h>
>
> #define vl_typedefs
> #include <vpp/api/vpe_all_api_h.h>
> #undef vl_typedefs
>
> #define vl_endianfun
> #include <vpp/api/vpe_all_api_h.h>
> #undef vl_endianfun
>
> #define vl_print(handle, ...)
> #define vl_printfun
> #include <vpp/api/vpe_all_api_h.h>
> #undef vl_printfun
>
> #define DEFAULT_QUEUE_SIZE 1024
>
> typedef struct
> {
> svm_queue_t *vl_input_queue; /* vpe input queue */
> u32 my_client_index; /* API client handle */
> } vpp_api_agent_main_t;
>
> vpp_api_agent_main_t agent_main;
>
> static void
> vl_api_sw_interface_details_t_handler(vl_api_sw_interface_details_t * mp)
> {
> printf("Received: sw_interface_details interface_index:%u
> interface_name:%s context:0x%x\n",
> ntohl(mp->sw_if_index), mp->interface_name, ntohl(mp->context));
> }
>
> static void vl_api_create_loopback_reply_t_handler(
> vl_api_create_loopback_reply_t * mp) {
> printf("\tCreate loopback reply received, message id: %d, with retval:
> %d, new interface index: %d\n",
> clib_net_to_host_u32(mp->context), mp->retval,
> clib_net_to_host_u32(mp->sw_if_index));
> }
>
> #define foreach_vpe_api_reply_msg \
> _(SW_INTERFACE_DETAILS, sw_interface_details) \
> _(CREATE_LOOPBACK, create_loopback_reply)
>
> void agent_api_hookup(vpp_api_agent_main_t * agentm)
> {
> #define _(N,n) \
> vl_msg_api_set_handlers(VL_API_##N, #n, \
> vl_api_##n##_t_handler, \
> vl_noop_handler, \
> vl_api_##n##_t_endian, \
> vl_api_##n##_t_print, \
> sizeof(vl_api_##n##_t), 1);
> foreach_vpe_api_reply_msg;
> #undef _
> }
>
>
> void send_sw_interface_dump()
> {
> vl_api_sw_interface_dump_t * mp;
>
> mp = vl_msg_api_alloc(sizeof(*mp));
> memset(mp, 0, sizeof(*mp));
> mp->_vl_msg_id = ntohs(VL_API_SW_INTERFACE_DUMP);
> mp->client_index = agent_main.my_client_index;
> mp->context = htonl (0x1234);
>
> vl_msg_api_send_shmem(agent_main.vl_input_queue, (u8 *) &mp);
> printf("Sent: sw_interface_dump context:0x%x\n", ntohl(mp->context));
>
> }
>
> static void create_loopback()
> {
> vl_api_create_loopback_t * mp;
>
> // Allocate create loopback message
> mp = vl_msg_api_alloc(sizeof(*mp));
> memset(mp, 0, sizeof(*mp));
> // Set the message ID to create_loopback ID reported by VPP
> mp->_vl_msg_id = ntohs(VL_API_CREATE_LOOPBACK);
> // Set our client index
> mp->client_index = agent_main.my_client_index;
> // Set context (context is an arbitrary number that can help matching
> request/reply pairs)
> mp->context = htonl (0x1235);
> // We could also set mac address
>
> // send messagee to VPP
> vl_msg_api_send_shmem(agent_main.vl_input_queue, (u8 *) &mp);
> printf("Sending create loopback. Create loopback msg \n");
> }
>
> void main()
> {
> // Initialization
> clib_mem_init_thread_safe(0, 256 << 20);
> clib_memset(&agent_main, 0, sizeof (vpp_api_agent_main_t));
>
> // Create shared mem with vpp
> api_main_t *am = vlibapi_get_main();
>
> if (vl_client_connect_to_vlib("/vpe-api", "t3_app", DEFAULT_QUEUE_SIZE) <
> 0)
> {
> printf("Shmem connect failed\n");
> svm_region_exit();
> }
> else
> {
> agent_main.vl_input_queue = am->shmem_hdr->vl_input_queue;
> agent_main.my_client_index = am->my_client_index;
>
> printf("Connected to vpp!!!\n");
> }
>
> // Register callback functions
> agent_api_hookup(&agent_main);
>
> send_sw_interface_dump();
> sleep(1);
>
> create_loopback();
> sleep(3);
> }
>
>
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