> I'm OK with what you say about RQ, but replacing sq_wqebb_count with 
 > log_sq_bb_per_wqe
 > looks like obfuscation to me: you still pass in 2 values, and the kernel does
 > not actually care about number of SQ WRs at all, it really only needs to 
 > look at
 > # of wqbbs.

Makes sense... how about:

struct mlx4_ib_create_qp {
        __u64   buf_addr;
        __u64   db_addr;
        __u8    log_sq_stride;
        __u8    log_sq_bb_count;
        __u8    reserved[6];
};
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