mac80211: add support for mcs masks

* Handle MCS masks set by the user.
* Match rates provided by the rate control algorithm to the mask set,
  also in HT mode, and switch back to legacy mode if necessary.
* add debugfs files to observate the rate selection

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 6b0d70e960d..c33feede5dc 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1181,6 +1181,13 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
                 sband = local->hw.wiphy->bands[i];
                 sdata->rc_rateidx_mask[i] =
                         sband ? (1 << sband->n_bitrates) - 1 : 0;
+                if (sband)
+                        memcpy(sdata->rc_rateidx_mcs_mask[i],
+                               sband->ht_cap.mcs.rx_mask,
+                               sizeof(sdata->rc_rateidx_mcs_mask[i]));
+                else
+                        memset(sdata->rc_rateidx_mcs_mask[i], 0,
+                               sizeof(sdata->rc_rateidx_mcs_mask[i]));
         }
 
         /* setup type-dependent data */