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diff --git a/sys/net80211/ieee80211_vht.h b/sys/net80211/ieee80211_vht.h
--- a/sys/net80211/ieee80211_vht.h
+++ b/sys/net80211/ieee80211_vht.h
@@ -67,5 +67,7 @@
bool ieee80211_vht_check_tx_vht(const struct ieee80211_node *);
bool ieee80211_vht_check_tx_bw(const struct ieee80211_node *,
enum ieee80211_sta_rx_bw);
+bool ieee80211_vht_node_check_valid_mcs(const struct ieee80211_node *,
+ enum ieee80211_sta_rx_bw bw, uint8_t, uint8_t);
#endif /* _NET80211_IEEE80211_VHT_H_ */
diff --git a/sys/net80211/ieee80211_vht.c b/sys/net80211/ieee80211_vht.c
--- a/sys/net80211/ieee80211_vht.c
+++ b/sys/net80211/ieee80211_vht.c
@@ -1061,3 +1061,53 @@
return (false);
}
}
+
+/**
+ * @brief Check if the given VHT bw/nss/mcs combination is valid
+ * for the give node.
+ *
+ * This checks whether the given VHT bw/nss/mcs is valid based on
+ * the negotiated rate mask in the node.
+ *
+ * @param ni struct ieee80211_node node to check
+ * @param bw channel bandwidth to check
+ * @param nss NSS
+ * @param mcs MCS
+ * @returns True if this combination is available, false otherwise.
+ */
+bool
+ieee80211_vht_node_check_valid_mcs(const struct ieee80211_node *ni,
+ enum ieee80211_sta_rx_bw bw, uint8_t nss, uint8_t mcs)
+{
+ uint8_t mc;
+
+ /* Validate arguments */
+ if (nss < 1 || nss > 8)
+ return (false);
+ if (mcs > 9)
+ return (false);
+
+ /* Check our choice of rate is actually valid */
+ if (!ieee80211_phy_vht_validate_mcs(bw, nss, mcs))
+ return (false);
+
+ /*
+ * Next, check if the MCS rate is available for the
+ * given NSS.
+ */
+ mc = ni->ni_vht_tx_map >> (2*(nss-1)) & 0x3;
+ switch (mc) {
+ case IEEE80211_VHT_MCS_NOT_SUPPORTED:
+ /* Not supported at this NSS */
+ return (false);
+ case IEEE80211_VHT_MCS_SUPPORT_0_9:
+ return (mcs <= 9);
+ case IEEE80211_VHT_MCS_SUPPORT_0_8:
+ return (mcs <= 8);
+ case IEEE80211_VHT_MCS_SUPPORT_0_7:
+ return (mcs <= 7);
+ default:
+ return (false);
+ }
+}
+

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