Anonymus nested structs

Hi,

I’m trying to wrap the following struct:

struct ibv_odp_caps {
    uint64_t general_caps;
    struct {
        uint32_t rc_odp_caps;
        uint32_t uc_odp_caps;
        uint32_t ud_odp_caps;
    } per_transport_caps;
};

as follows:

    cdef struct per_transport_caps:
        unsigned int    rc_odp_caps
        unsigned int    uc_odp_caps
        unsigned int    ud_odp_caps

    cdef struct ibv_odp_caps:
        unsigned long       general_caps
        per_transport_caps  per_transport_caps

but get the following error:

warning: 'struct per_transport_caps' declared inside parameter list [enabled by default]
 static PyObject* __pyx_convert__to_py_struct__per_transport_caps(struct per_transport_caps s);
warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
warning: 'struct per_transport_caps' declared inside parameter list [enabled by default]
 static PyObject* __pyx_convert__to_py_struct__per_transport_caps(struct per_transport_caps s) {
error: parameter 1 ('s') has incomplete type
 static PyObject* __pyx_convert__to_py_struct__per_transport_caps(struct per_transport_caps s) {
error: type of formal parameter 1 is incomplete
       member = __pyx_convert__to_py_struct__per_transport_caps(s.per_transport_caps); if (unlikely(!member)) goto bad;

The Oreily book suggested to flatten the inner struct, but this also fails:

    cdef struct ibv_odp_caps:
        unsigned long       general_caps
        unsigned int    rc_odp_caps
        unsigned int    uc_odp_caps
        unsigned int    ud_odp_caps

gets:

error: 'struct ibv_odp_caps' has no member named 'rc_odp_caps'
       member = __Pyx_PyInt_From_unsigned_int(s.rc_odp_caps); if (unlikely(!member)) goto bad;
error: 'struct ibv_odp_caps' has no member named 'uc_odp_caps'
       member = __Pyx_PyInt_From_unsigned_int(s.uc_odp_caps); if (unlikely(!member)) goto bad;
error: 'struct ibv_odp_caps' has no member named 'ud_odp_caps'
       member = __Pyx_PyInt_From_unsigned_int(s.ud_odp_caps); if (unlikely(!member)) goto bad;

How do I wrap this properly?

[horeyazub]

hi, @noaos we were able to add the struct of per_transport_caps by using the following:

cdef struct per_transport_caps: uint32_t rc_odp_caps uint32_t uc_odp_caps uint32_t ud_odp_caps

cdef struct ibv_odp_caps:  
    uint64_t general_caps
    per_transport_caps per_transport_caps

what was missing is the import of : from libc.stdint cimport uint32_t

and this most likely why you had the error of : pyverbs/device.c:1827:56: error: unknown type name ‘ibv_odp_caps_sub’ static PyObject* __pyx_convert__to_py_ibv_odp_caps_sub(ibv_odp_caps_sub s);

the way to use it is by calling it like so: self.odp_caps.per_transport_caps.rc_odp_caps

I tried it and it worked for me

[gmossessian]

I’ve replicated your error now, but I also have some code in production that looks exactly the same, except it works.

I will try to understand what the difference is in a few days, after the holidays are over. Happy New Year!