On 11/26/2012 07:55 PM, Johannes Berg wrote:
+static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
+ struct cfg80211_bss *cbss)
+{
+ struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+ const u8 *ht_cap_ie, *vht_cap_ie;
+ const struct ieee80211_ht_cap *ht_cap;
+ const struct ieee80211_vht_cap *vht_cap;
+ u8 chains = 1;
+
+ if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
+ return chains;
+
+ ht_cap_ie = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY,
+ cbss->information_elements,
+ cbss->len_information_elements);
+ if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
+ ht_cap = (void *)(ht_cap_ie + 2);
+ chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
+ /*
+ * TODO: use "Tx Maximum Number Spatial Streams Supported" and
+ * "Tx Unequal Modulation Supported" fields.
+ */
+
+ }
+
+ if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
+ return chains;
+
+
+ vht_cap_ie = cfg80211_find_ie(WLAN_EID_VHT_CAPABILITY,
+ cbss->information_elements,
+ cbss->len_information_elements);
+ if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
+ u8 nss;
+ u16 tx_mcs_map;
+
+ vht_cap = (void *)(vht_cap_ie + 2);
+ tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
Guess we should take rx_mcs_map as we are determining vht_rx_chains?
Thanks,
Mahesh
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