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?
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