From dd5b4cc71cd09c33e1579cc6d5720656e94e52de Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 22 Nov 2010 20:58:24 +0100 Subject: cfg80211/mac80211: improve ad-hoc multicast rate handling - store the multicast rate as an index instead of the rate value (reduces cpu overhead in a hotpath) - validate the rate values (must match a bitrate in at least one sband) Signed-off-by: Felix Fietkau Signed-off-by: John W. Linville --- net/mac80211/ibss.c | 3 ++- net/mac80211/rate.c | 25 ++++++++++++------------- net/wireless/nl80211.c | 36 +++++++++++++++++++++++++++++++++--- 3 files changed, 47 insertions(+), 17 deletions(-) (limited to 'net') diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c index 6fe6837..410d104 100644 --- a/net/mac80211/ibss.c +++ b/net/mac80211/ibss.c @@ -915,7 +915,8 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, sdata->u.ibss.privacy = params->privacy; sdata->u.ibss.basic_rates = params->basic_rates; - sdata->vif.bss_conf.mcast_rate = params->mcast_rate; + memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, + sizeof(params->mcast_rate)); sdata->vif.bss_conf.beacon_int = params->beacon_interval; diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c index 76de4f8..3d5a2cb 100644 --- a/net/mac80211/rate.c +++ b/net/mac80211/rate.c @@ -211,20 +211,11 @@ static bool rc_no_data_or_no_ack(struct ieee80211_tx_rate_control *txrc) return (info->flags & IEEE80211_TX_CTL_NO_ACK) || !ieee80211_is_data(fc); } -static void rc_send_low_broadcast(s8 *idx, u32 basic_rates, u32 mcast_rate, +static void rc_send_low_broadcast(s8 *idx, u32 basic_rates, struct ieee80211_supported_band *sband) { u8 i; - if (mcast_rate) { - for (i = 0; i < sband->n_bitrates; i++) { - if (sband->bitrates[i].bitrate == mcast_rate) { - *idx = i; - return; - } - } - } - if (basic_rates == 0) return; /* assume basic rates unknown and accept rate */ if (*idx < 0) @@ -247,17 +238,25 @@ bool rate_control_send_low(struct ieee80211_sta *sta, struct ieee80211_tx_rate_control *txrc) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); + struct ieee80211_supported_band *sband = txrc->sband; + int mcast_rate; if (!sta || !priv_sta || rc_no_data_or_no_ack(txrc)) { info->control.rates[0].idx = rate_lowest_index(txrc->sband, sta); info->control.rates[0].count = (info->flags & IEEE80211_TX_CTL_NO_ACK) ? 1 : txrc->hw->max_rate_tries; - if (!sta && txrc->bss) + if (!sta && txrc->bss) { + mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; + if (mcast_rate > 0) { + info->control.rates[0].idx = mcast_rate - 1; + return true; + } + rc_send_low_broadcast(&info->control.rates[0].idx, txrc->bss_conf->basic_rates, - txrc->bss_conf->mcast_rate, - txrc->sband); + sband); + } return true; } return false; diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index b15eb77..8734efa 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3600,6 +3600,34 @@ static int nl80211_disassociate(struct sk_buff *skb, struct genl_info *info) local_state_change); } +static bool +nl80211_parse_mcast_rate(struct cfg80211_registered_device *rdev, + int mcast_rate[IEEE80211_NUM_BANDS], + int rateval) +{ + struct wiphy *wiphy = &rdev->wiphy; + bool found = false; + int band, i; + + for (band = 0; band < IEEE80211_NUM_BANDS; band++) { + struct ieee80211_supported_band *sband; + + sband = wiphy->bands[band]; + if (!sband) + continue; + + for (i = 0; i < sband->n_bitrates; i++) { + if (sband->bitrates[i].bitrate == rateval) { + mcast_rate[band] = i + 1; + found = true; + break; + } + } + } + + return found; +} + static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info) { struct cfg80211_registered_device *rdev = info->user_ptr[0]; @@ -3683,9 +3711,11 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info) return -EINVAL; } } - if (info->attrs[NL80211_ATTR_MCAST_RATE]) - ibss.mcast_rate = - nla_get_u32(info->attrs[NL80211_ATTR_MCAST_RATE]); + + if (info->attrs[NL80211_ATTR_MCAST_RATE] && + !nl80211_parse_mcast_rate(rdev, ibss.mcast_rate, + nla_get_u32(info->attrs[NL80211_ATTR_MCAST_RATE]))) + return -EINVAL; if (ibss.privacy && info->attrs[NL80211_ATTR_KEYS]) { connkeys = nl80211_parse_connkeys(rdev, -- cgit v1.1