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mac80211: distinct between max rates and the number of rates the hw can report

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Some drivers cannot handle multiple retry rates specified by the rc
algorithm but instead use their own retry table (for example rt2800).
However, if such a device registers itself with a max_rates value of 1
the rc algorithm cannot make use of the extended information the device
can provide about retried rates. On the other hand, if a device
registers itself with a max_rates value > 1 the rc algorithm assumes
that the device can handle multi rate retries.

Fix this issue by introducing another hw parameter max_report_rates that
can be set to a different value then max_rates to indicate if a device
is capable of reporting more rates then specified in max_rates.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Helmut Schaa 2010-10-02 11:31:55 +02:00 committed by John W. Linville
parent 5a5b6ed6ce
commit 78be49ec2a
3 changed files with 10 additions and 2 deletions
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6
include/net/mac80211.h
View file

@ -1109,7 +1109,10 @@ enum ieee80211_hw_flags {
* @sta_data_size: size (in bytes) of the drv_priv data area
* within &struct ieee80211_sta.
*
* @max_rates: maximum number of alternate rate retry stages
* @max_rates: maximum number of alternate rate retry stages the hw
* can handle.
* @max_report_rates: maximum number of alternate rate retry stages
* the hw can report back.
* @max_rate_tries: maximum number of tries for each stage
*
* @napi_weight: weight used for NAPI polling. You must specify an
@ -1131,6 +1134,7 @@ struct ieee80211_hw {
u16 max_listen_interval;
s8 max_signal;
u8 max_rates;
u8 max_report_rates;
u8 max_rate_tries;
};

4
net/mac80211/main.c
View file

@ -537,6 +537,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
/* set up some defaults */
local->hw.queues = 1;
local->hw.max_rates = 1;
local->hw.max_report_rates = 0;
local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
local->user_power_level = -1;
@ -612,6 +613,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
WLAN_CIPHER_SUITE_AES_CMAC
};
if (hw->max_report_rates == 0)
hw->max_report_rates = hw->max_rates;
/*
* generic code guarantees at least one band,
* set this very early because much code assumes

2
net/mac80211/status.c
View file

@ -176,7 +176,7 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
/* the HW cannot have attempted that rate */
if (i >= hw->max_rates) {
if (i >= hw->max_report_rates) {
info->status.rates[i].idx = -1;
info->status.rates[i].count = 0;
} else if (info->status.rates[i].idx >= 0) {