DESC_PKT_TCODE_MASK
tcode = (hdr->q1 & DESC_PKT_TCODE_MASK) >> DESC_PKT_TCODE_SHIFT;
(((data) & DESC_PKT_TCODE_MASK) >> DESC_PKT_TCODE_SHIFT)
(((TC) << DESC_PKT_TCODE_SHIFT) & DESC_PKT_TCODE_MASK) | \