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iwlwifi: check short GI support per-station rather than globally

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Short guard interval support is a local per-station parameter not a global
per-NIC parameter.  (mac80211 will correctly remove SGI support from station
capabilities if the BSS does not permit it).  This patch removes the short GI
support bitfield from the global iwl_ht_info struct and properly uses
per-station HT capabilities during rate selection.

Signed-off-by: Daniel C Halperin <daniel.c.halperin@intel.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Daniel C Halperin 2009-08-13 13:30:58 -07:00 committed by John W. Linville
parent 28bd723bba
commit 28e6f48953
3 changed files with 15 additions and 63 deletions
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69
drivers/net/wireless/iwlwifi/iwl-agn-rs.c
View File

@ -1225,18 +1225,6 @@ static int rs_switch_to_mimo2(struct iwl_priv *priv,
else
tbl->is_ht40 = 0;
/* FIXME: - don't toggle SGI here
if (tbl->is_ht40) {
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);
@ -1291,18 +1279,6 @@ static int rs_switch_to_mimo3(struct iwl_priv *priv,
else
tbl->is_ht40 = 0;
/* FIXME: - don't toggle SGI here
if (tbl->is_ht40) {
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);
@ -1350,18 +1326,6 @@ static int rs_switch_to_siso(struct iwl_priv *priv,
else
tbl->is_ht40 = 0;
/* FIXME: - don't toggle SGI here
if (tbl->is_ht40) {
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;
*/
if (is_green)
tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
@ -1530,6 +1494,7 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
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]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
@ -1589,13 +1554,11 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
goto out;
break;
case IWL_SISO_SWITCH_GI:
if (!tbl->is_ht40 &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_20MHZ))
if (!tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_20))
break;
if (tbl->is_ht40 &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_40MHZ))
if (tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_40))
break;
IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
@ -1669,6 +1632,7 @@ static int rs_move_mimo2_to_other(struct iwl_priv *priv,
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]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
@ -1729,13 +1693,11 @@ static int rs_move_mimo2_to_other(struct iwl_priv *priv,
break;
case IWL_MIMO2_SWITCH_GI:
if (!tbl->is_ht40 &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_20MHZ))
if (!tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_20))
break;
if (tbl->is_ht40 &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_40MHZ))
if (tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_40))
break;
IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
@ -1811,6 +1773,7 @@ static int rs_move_mimo3_to_other(struct iwl_priv *priv,
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]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
@ -1893,13 +1856,11 @@ static int rs_move_mimo3_to_other(struct iwl_priv *priv,
break;
case IWL_MIMO3_SWITCH_GI:
if (!tbl->is_ht40 &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_20MHZ))
if (!tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_20))
break;
if (tbl->is_ht40 &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_40MHZ))
if (tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_40))
break;
IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");

5
drivers/net/wireless/iwlwifi/iwl-core.c
View File

@ -2391,11 +2391,6 @@ static void iwl_ht_conf(struct iwl_priv *priv,
}
ht_conf = &sta->ht_cap;
if (ht_conf->cap & IEEE80211_HT_CAP_SGI_20)
iwl_conf->sgf |= HT_SHORT_GI_20MHZ;
if (ht_conf->cap & IEEE80211_HT_CAP_SGI_40)
iwl_conf->sgf |= HT_SHORT_GI_40MHZ;
iwl_conf->is_green_field = !!(ht_conf->cap & IEEE80211_HT_CAP_GRN_FLD);
iwl_conf->sm_ps = (u8)((ht_conf->cap & IEEE80211_HT_CAP_SM_PS) >> 2);

4
drivers/net/wireless/iwlwifi/iwl-dev.h
View File

@ -508,7 +508,6 @@ struct iwl_ht_info {
u8 supported_chan_width;
u8 sm_ps;
u8 is_green_field;
u8 sgf; /* HT_SHORT_GI_* short guard interval */
struct ieee80211_mcs_info mcs;
/* BSS related data */
u8 extension_chan_offset;
@ -728,9 +727,6 @@ struct iwl_dma_ptr {
size_t size;
};
#define HT_SHORT_GI_20MHZ (1 << 0)
#define HT_SHORT_GI_40MHZ (1 << 1)
#define IWL_CHANNEL_WIDTH_20MHZ 0
#define IWL_CHANNEL_WIDTH_40MHZ 1