TDES3_CONTEXT_TYPE
if (le32_to_cpu(p->des3) & TDES3_CONTEXT_TYPE)
p->des3 = cpu_to_le32(TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV);
p->des3 |= cpu_to_le32(TDES3_CONTEXT_TYPE);