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iwlwifi: adding MIMO3 support in rate scaling

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Separated the MIMO tpt matrix into MIMO2 and MIMO3, adding MIMO3 support
in rate scaling algorithm. If the device support 3x3, then utilize all
three antenna (A/B/C) for tx to improve throughput.

Adding rs_switch_to_mimo3() function to allow switch to mimo3 modulation
mode from other modes(legacy/siso/mimo2). Adding rs_move_mimo3_to_other()
function to allow switch from mimo3 modulation mode to either siso or mimo2;
also support toggle between SGI and NGI.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Wey-Yi Guy 2009-04-01 14:33:24 -07:00 committed by John W. Linville
parent 11397a656f
commit 584a0f0063
2 changed files with 327 additions and 26 deletions
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335
drivers/net/wireless/iwlwifi/iwl-agn-rs.c
View file

@ -191,7 +191,7 @@ static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
* 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
* "G" is the only table that supports CCK (the first 4 rates).
*/
/*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
static s32 expected_tpt_A[IWL_RATE_COUNT] = {
0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
};
@ -208,11 +208,11 @@ static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
};
static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
};
static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
};
@ -224,14 +224,31 @@ static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
};
static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
};
static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
};
/* Expected throughput metric MIMO3 */
static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
};
static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
};
static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
};
static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
};
static inline u8 rs_extract_rate(u32 rate_n_flags)
{
return (u8)(rate_n_flags & 0xFF);
@ -1011,17 +1028,26 @@ static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
tbl->expected_tpt = expected_tpt_siso20MHzSGI;
else
tbl->expected_tpt = expected_tpt_siso20MHz;
} else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
} else if (is_mimo2(tbl->lq_type)) {
if (tbl->is_fat && !lq_sta->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo40MHz;
tbl->expected_tpt = expected_tpt_mimo2_40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo20MHz;
tbl->expected_tpt = expected_tpt_mimo2_20MHz;
} else if (is_mimo3(tbl->lq_type)) {
if (tbl->is_fat && !lq_sta->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo3_40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo3_20MHz;
} else
tbl->expected_tpt = expected_tpt_G;
}
@ -1130,7 +1156,7 @@ static s32 rs_get_best_rate(struct iwl_priv *priv,
}
/*
* Set up search table for MIMO
* Set up search table for MIMO2
*/
static int rs_switch_to_mimo2(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
@ -1183,7 +1209,73 @@ static int rs_switch_to_mimo2(struct iwl_priv *priv,
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
rate, rate_mask);
return -1;
}
tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate, is_green);
return 0;
}
/*
* Set up search table for MIMO3
*/
static int rs_switch_to_mimo3(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta,
struct iwl_scale_tbl_info *tbl, int index)
{
u16 rate_mask;
s32 rate;
s8 is_green = lq_sta->is_green;
if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
return -1;
if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
== WLAN_HT_CAP_SM_PS_STATIC)
return -1;
/* Need both Tx chains/antennas to support MIMO */
if (priv->hw_params.tx_chains_num < 3)
return -1;
IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
tbl->lq_type = LQ_MIMO3;
tbl->is_dup = lq_sta->is_dup;
tbl->action = 0;
rate_mask = lq_sta->active_mimo3_rate;
if (priv->current_ht_config.supported_chan_width
== IWL_CHANNEL_WIDTH_40MHZ)
tbl->is_fat = 1;
else
tbl->is_fat = 0;
/* FIXME: - don't toggle SGI here
if (tbl->is_fat) {
if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
} else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
*/
rs_set_expected_tpt_table(lq_sta, tbl);
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
rate, rate_mask);
@ -1342,9 +1434,29 @@ static int rs_move_legacy_other(struct iwl_priv *priv,
goto out;
}
break;
case IWL_LEGACY_SWITCH_MIMO3_ABC:
IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
/* Set up search table to try MIMO3 */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
search_tbl->ant_type = ANT_ABC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->action_counter = 0;
goto out;
}
break;
}
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
if (tbl->action == start_action)
@ -1357,7 +1469,7 @@ static int rs_move_legacy_other(struct iwl_priv *priv,
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
return 0;
@ -1457,9 +1569,23 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
rate_n_flags_from_tbl(priv, search_tbl,
index, is_green);
goto out;
case IWL_SISO_SWITCH_MIMO3_ABC:
IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
search_tbl->ant_type = ANT_ABC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
}
tbl->action++;
if (tbl->action > IWL_SISO_SWITCH_GI)
if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
if (tbl->action == start_action)
@ -1471,15 +1597,15 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_SISO_SWITCH_GI)
if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
return 0;
}
/*
* Try to switch to new modulation mode from MIMO
* Try to switch to new modulation mode from MIMO2
*/
static int rs_move_mimo_to_other(struct iwl_priv *priv,
static int rs_move_mimo2_to_other(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int index)
@ -1501,7 +1627,7 @@ static int rs_move_mimo_to_other(struct iwl_priv *priv,
switch (tbl->action) {
case IWL_MIMO2_SWITCH_ANTENNA1:
case IWL_MIMO2_SWITCH_ANTENNA2:
IWL_DEBUG_RATE(priv, "LQ: MIMO toggle Antennas\n");
IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
if (tx_chains_num <= 2)
break;
@ -1549,7 +1675,160 @@ static int rs_move_mimo_to_other(struct iwl_priv *priv,
HT_SHORT_GI_40MHZ))
break;
IWL_DEBUG_RATE(priv, "LQ: MIMO toggle SGI/NGI\n");
IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
/* Set up new search table for MIMO2 */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = !tbl->is_SGI;
rs_set_expected_tpt_table(lq_sta, search_tbl);
/*
* If active table already uses the fastest possible
* modulation (dual stream with short guard interval),
* and it's working well, there's no need to look
* for a better type of modulation!
*/
if (tbl->is_SGI) {
s32 tpt = lq_sta->last_tpt / 100;
if (tpt >= search_tbl->expected_tpt[index])
break;
}
search_tbl->current_rate =
rate_n_flags_from_tbl(priv, search_tbl,
index, is_green);
goto out;
case IWL_MIMO2_SWITCH_MIMO3_ABC:
IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
search_tbl->ant_type = ANT_ABC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
}
tbl->action++;
if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
if (tbl->action == start_action)
break;
}
search_tbl->lq_type = LQ_NONE;
return 0;
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
return 0;
}
/*
* Try to switch to new modulation mode from MIMO3
*/
static int rs_move_mimo3_to_other(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int index)
{
s8 is_green = lq_sta->is_green;
struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
struct iwl_scale_tbl_info *search_tbl =
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
struct iwl_rate_scale_data *window = &(tbl->win[index]);
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
int ret;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IWL_MIMO3_SWITCH_ANTENNA1:
case IWL_MIMO3_SWITCH_ANTENNA2:
IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
if (tx_chains_num <= 3)
break;
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
break;
memcpy(search_tbl, tbl, sz);
if (rs_toggle_antenna(valid_tx_ant,
&search_tbl->current_rate, search_tbl))
goto out;
break;
case IWL_MIMO3_SWITCH_SISO_A:
case IWL_MIMO3_SWITCH_SISO_B:
case IWL_MIMO3_SWITCH_SISO_C:
IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
/* Set up new search table for SISO */
memcpy(search_tbl, tbl, sz);
if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
search_tbl->ant_type = ANT_A;
else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
search_tbl->ant_type = ANT_B;
else
search_tbl->ant_type = ANT_C;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
case IWL_MIMO3_SWITCH_MIMO2_AB:
case IWL_MIMO3_SWITCH_MIMO2_AC:
case IWL_MIMO3_SWITCH_MIMO2_BC:
IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
search_tbl->ant_type = ANT_AB;
else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
search_tbl->ant_type = ANT_AC;
else
search_tbl->ant_type = ANT_BC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
case IWL_MIMO3_SWITCH_GI:
if (!tbl->is_fat &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_20MHZ))
break;
if (tbl->is_fat &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_40MHZ))
break;
IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
/* Set up new search table for MIMO */
memcpy(search_tbl, tbl, sz);
@ -1570,11 +1849,10 @@ static int rs_move_mimo_to_other(struct iwl_priv *priv,
rate_n_flags_from_tbl(priv, search_tbl,
index, is_green);
goto out;
}
tbl->action++;
if (tbl->action > IWL_MIMO2_SWITCH_GI)
tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
if (tbl->action > IWL_MIMO3_SWITCH_GI)
tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
if (tbl->action == start_action)
break;
@ -1584,8 +1862,8 @@ static int rs_move_mimo_to_other(struct iwl_priv *priv,
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_MIMO2_SWITCH_GI)
tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
if (tbl->action > IWL_MIMO3_SWITCH_GI)
tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
return 0;
}
@ -1997,8 +2275,10 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
rs_move_legacy_other(priv, lq_sta, conf, sta, index);
else if (is_siso(tbl->lq_type))
rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
else if (is_mimo2(tbl->lq_type))
rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
else
rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
/* If new "search" mode was selected, set up in uCode table */
if (lq_sta->search_better_tbl) {
@ -2362,6 +2642,9 @@ static void rs_fill_link_cmd(const struct iwl_priv *priv,
} else if (num_of_ant(tbl_type.ant_type) == 2) {
lq_cmd->general_params.dual_stream_ant_msk =
tbl_type.ant_type;
} else if (num_of_ant(tbl_type.ant_type) == 3) {
lq_cmd->general_params.dual_stream_ant_msk =
tbl_type.ant_type;
} /* otherwise we don't modify the existing value */
index++;

18
drivers/net/wireless/iwlwifi/iwl-agn-rs.h
View file

@ -241,6 +241,7 @@ enum {
#define IWL_LEGACY_SWITCH_MIMO2_AB 3
#define IWL_LEGACY_SWITCH_MIMO2_AC 4
#define IWL_LEGACY_SWITCH_MIMO2_BC 5
#define IWL_LEGACY_SWITCH_MIMO3_ABC 6
/* possible actions when in siso mode */
#define IWL_SISO_SWITCH_ANTENNA1 0
@ -249,6 +250,8 @@ enum {
#define IWL_SISO_SWITCH_MIMO2_AC 3
#define IWL_SISO_SWITCH_MIMO2_BC 4
#define IWL_SISO_SWITCH_GI 5
#define IWL_SISO_SWITCH_MIMO3_ABC 6
/* possible actions when in mimo mode */
#define IWL_MIMO2_SWITCH_ANTENNA1 0
@ -257,6 +260,21 @@ enum {
#define IWL_MIMO2_SWITCH_SISO_B 3
#define IWL_MIMO2_SWITCH_SISO_C 4
#define IWL_MIMO2_SWITCH_GI 5
#define IWL_MIMO2_SWITCH_MIMO3_ABC 6
/* possible actions when in mimo3 mode */
#define IWL_MIMO3_SWITCH_ANTENNA1 0
#define IWL_MIMO3_SWITCH_ANTENNA2 1
#define IWL_MIMO3_SWITCH_SISO_A 2
#define IWL_MIMO3_SWITCH_SISO_B 3
#define IWL_MIMO3_SWITCH_SISO_C 4
#define IWL_MIMO3_SWITCH_MIMO2_AB 5
#define IWL_MIMO3_SWITCH_MIMO2_AC 6
#define IWL_MIMO3_SWITCH_MIMO2_BC 7
#define IWL_MIMO3_SWITCH_GI 8
/*FIXME:RS:add possible actions for MIMO3*/