IEEE80211_HTCAP_MPDUDENSITY_16
v = IEEE80211_HTCAP_MPDUDENSITY_16;
case IEEE80211_HTCAP_MPDUDENSITY_16:
vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_16;
if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16)
ireq->i_val <= IEEE80211_HTCAP_MPDUDENSITY_16))