ath9k: update the ath_max_4ms_framelen table

Include MCS0-31 and also add SGI for HT20. This makes it
possible to support more different rate combinations with
newer hardware.

Based on a patch by Selvam. T.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 27 insertions, 14 deletions

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 5d3d5635b92f..4078982fb9e9 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -71,24 +71,36 @@ static void ath_tx_rc_status(struct ath_buf *bf, struct ath_tx_status *ts,
                              int nbad, int txok, bool update_rc);
 
 enum {
-        MCS_DEFAULT,
+        MCS_HT20,
+        MCS_HT20_SGI,
         MCS_HT40,
         MCS_HT40_SGI,
 };
 
-static int ath_max_4ms_framelen[3][16] = {
-        [MCS_DEFAULT] = {
-                3216,  6434,  9650,  12868, 19304, 25740,  28956,  32180,
-                6430,  12860, 19300, 25736, 38600, 51472,  57890,  64320,
+static int ath_max_4ms_framelen[4][32] = {
+        [MCS_HT20] = {
+                3212,  6432,  9648,  12864,  19300,  25736,  28952,  32172,
+                6424,  12852, 19280, 25708,  38568,  51424,  57852,  64280,
+                9628,  19260, 28896, 38528,  57792,  65532,  65532,  65532,
+                12828, 25656, 38488, 51320,  65532,  65532,  65532,  65532,
+        },
+        [MCS_HT20_SGI] = {
+                3572,  7144,  10720,  14296,  21444,  28596,  32172,  35744,
+                7140,  14284, 21428,  28568,  42856,  57144,  64288,  65532,
+                10700, 21408, 32112,  42816,  64228,  65532,  65532,  65532,
+                14256, 28516, 42780,  57040,  65532,  65532,  65532,  65532,
         },
         [MCS_HT40] = {
-                6684,  13368, 20052, 26738, 40104, 53476,  60156,  66840,
-                13360, 26720, 40080, 53440, 80160, 106880, 120240, 133600,
+                6680,  13360,  20044,  26724,  40092,  53456,  60140,  65532,
+                13348, 26700,  40052,  53400,  65532,  65532,  65532,  65532,
+                20004, 40008,  60016,  65532,  65532,  65532,  65532,  65532,
+                26644, 53292,  65532,  65532,  65532,  65532,  65532,  65532,
         },
         [MCS_HT40_SGI] = {
-                /* TODO: Only MCS 7 and 15 updated, recalculate the rest */
-                6684,  13368, 20052, 26738, 40104, 53476,  60156,  74200,
-                13360, 26720, 40080, 53440, 80160, 106880, 120240, 148400,
+                7420,  14844,  22272,  29696,  44544,  59396,  65532,  65532,
+                14832, 29668,  44504,  59340,  65532,  65532,  65532,  65532,
+                22232, 44464,  65532,  65532,  65532,  65532,  65532,  65532,
+                29616, 59232,  65532,  65532,  65532,  65532,  65532,  65532,
         }
 };
 
@@ -538,12 +550,13 @@ static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
                                 break;
                         }
 
-                        if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
-                                modeidx = MCS_HT40_SGI;
-                        else if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+                        if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
                                 modeidx = MCS_HT40;
                         else
-                                modeidx = MCS_DEFAULT;
+                                modeidx = MCS_HT20;
+
+                        if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
+                                modeidx++;
 
                         frmlen = ath_max_4ms_framelen[modeidx][rates[i].idx];
                         max_4ms_framelen = min(max_4ms_framelen, frmlen);