TDES2_BUFFER1_SIZE_MASK
return (le32_to_cpu(p->des2) & TDES2_BUFFER1_SIZE_MASK);
p->des2 |= cpu_to_le32(len & TDES2_BUFFER1_SIZE_MASK);
p->des2 |= cpu_to_le32(FIELD_PREP(TDES2_BUFFER1_SIZE_MASK,