IDPF_TX_DESCS_PER_CACHE_LINE
needed = count + IDPF_TX_DESCS_PER_CACHE_LINE + IDPF_TX_DESCS_FOR_CTX;
count += (IDPF_TX_DESCS_PER_CACHE_LINE + tso);
IDPF_TX_DESCS_PER_CACHE_LINE + \