nfp_rtsym_writeq
err = nfp_rtsym_writeq(pf->cpp, pf->mbox, NFP_MBOX_DATA_LEN, in_length);
err = nfp_rtsym_writeq(pf->cpp, pf->mbox, NFP_MBOX_CMD, cmd);
int nfp_rtsym_writeq(struct nfp_cpp *cpp, const struct nfp_rtsym *sym, u64 off,
err = nfp_rtsym_writeq(rtbl->cpp, sym, 0, value);