> We are trying to use VPP C API in our C application to call VPP functionality
> in our system. Our system has different sub systems running different VPP
> versions. We want to have single C application interacting with different
> versions of VPP. We started with reading SRv6 policy and steering policy data
> using VPP C API's sr_steering_pol_dump and sr_policies_dump structures. But,
> while testing with different version, we found differences during data
> reading in handler functions.
>
> Till VPP v20.01, fields in structures sr_policies_details and
> sr_steering_pol_details are as shown below : -
> define sr_policies_details
> {
> u32 context;
> vl_api_srv6_sid_t bsid;
> u8 type;
> u8 is_encap;
> u32 fib_table;
> u8 num_sid_lists;
> vl_api_srv6_sid_list_t sid_lists[num_sid_lists];
> };
>
> define sr_steering_pol_details
> {
> u32 context;
> u8 traffic_type;
> u32 fib_table;
> u8 prefix_addr[16];
> u32 mask_width;
> u32 sw_if_index;
> vl_api_srv6_sid_t bsid;
> };
>
> From VPP v20.05, fields in structures sr_policies_details and
> sr_steering_pol_details are as shown below : -
> define sr_policies_details
> {
> u32 context;
> vl_api_ip6_address_t bsid;
> bool is_spray;
> bool is_encap;
> u32 fib_table;
> u8 num_sid_lists;
> vl_api_srv6_sid_list_t sid_lists[num_sid_lists];
> };
> define sr_steering_pol_details
> {
> u32 context;
> vl_api_sr_steer_t traffic_type;
> u32 fib_table;
> vl_api_prefix_t prefix;
> vl_api_interface_index_t sw_if_index;
> vl_api_ip6_address_t bsid;
> };
>
> Our handler functions has following signatures : -
> static void
> vl_api_sr_steering_pol_details_t_handler(vl_api_sr_steering_pol_details_t *
> mp)
> static void vl_api_sr_policies_details_t_handler(vl_api_sr_policies_details_t
> * mp)
>
> Is there a way to abstract this difference and use the same piece of code for
> both versions of VPP?
Yes, but you would have to build your own wrapper.
Cheers,
Ole
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