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mac80211: reduce IEEE80211_TX_MAX_RATES 

IEEE80211_TX_MAX_RATES can be reduced from 5 to 4 as there
is no current hardware supporting a rate chain with 5 multi
rate stages (mrr), so 4 mrr stages are sufficient.

The memory that is freed within the ieee80211_tx_info struct
will be used in the upcoming Transmission Power Control (TPC)
implementation.

Suggested-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>
[reword commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Thomas Huehn 2012-07-02 19:46:16 +02:00 committed by Johannes Berg
parent cb831b537d
commit e3e1a0bcb3
4 changed files with 11 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/wireless/ath/carl9170/tx.c
View File

@ -277,11 +277,11 @@ static void carl9170_tx_release(struct kref *ref)
return;
BUILD_BUG_ON(
offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
offsetof(struct ieee80211_tx_info, status.ack_signal) != 20);
memset(&txinfo->status.ampdu_ack_len, 0,
memset(&txinfo->status.ack_signal, 0,
sizeof(struct ieee80211_tx_info) -
offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
offsetof(struct ieee80211_tx_info, status.ack_signal));
if (atomic_read(&ar->tx_total_queued))
ar->tx_schedule = true;

6
drivers/net/wireless/p54/txrx.c
View File

@ -422,11 +422,11 @@ static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
* Clear manually, ieee80211_tx_info_clear_status would
* clear the counts too and we need them.
*/
memset(&info->status.ampdu_ack_len, 0,
memset(&info->status.ack_signal, 0,
sizeof(struct ieee80211_tx_info) -
offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
offsetof(struct ieee80211_tx_info, status.ack_signal));
BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
status.ampdu_ack_len) != 23);
status.ack_signal) != 20);
if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
pad = entry_data->align[0];

8
include/net/mac80211.h
View File

@ -475,7 +475,7 @@ enum mac80211_rate_control_flags {
#define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24
/* maximum number of rate stages */
#define IEEE80211_TX_MAX_RATES 5
#define IEEE80211_TX_MAX_RATES 4
/**
* struct ieee80211_tx_rate - rate selection/status
@ -563,11 +563,11 @@ struct ieee80211_tx_info {
} control;
struct {
struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
u8 ampdu_ack_len;
int ack_signal;
u8 ampdu_ack_len;
u8 ampdu_len;
u8 antenna;
/* 14 bytes free */
/* 21 bytes free */
} status;
struct {
struct ieee80211_tx_rate driver_rates[
@ -634,7 +634,7 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
info->status.rates[i].count = 0;
BUILD_BUG_ON(
offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
offsetof(struct ieee80211_tx_info, status.ack_signal) != 20);
memset(&info->status.ampdu_ack_len, 0,
sizeof(struct ieee80211_tx_info) -
offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));

3
net/mac80211/tx.c
View File

@ -959,8 +959,7 @@ ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
info->control.rates[1].idx = -1;
info->control.rates[2].idx = -1;
info->control.rates[3].idx = -1;
info->control.rates[4].idx = -1;
BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
} else {
hdr->frame_control &= ~morefrags;