Return-path: Received: from mail.gmx.net ([213.165.64.20]:59139 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752187AbXLHLVw (ORCPT ); Sat, 8 Dec 2007 06:21:52 -0500 Subject: [PATCH 1/4] mac80211: Clean up rate selection From: Mattias Nissler To: linux-wireless Cc: Stefano Brivio , "John W. Linville" , Johannes Berg In-Reply-To: <1197112439.7472.34.camel@localhost> References: <1197112439.7472.34.camel@localhost> Content-Type: text/plain Date: Sat, 08 Dec 2007 12:21:49 +0100 Message-Id: <1197112909.7472.49.camel@localhost> (sfid-20071208_112159_240600_F494B452) Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: Move some code out of rc80211_simple since it's probably needed for all rate selection algorithms. While at it, clean up the rate_control_get_rate() interface. Signed-off-by: Mattias Nissler --- net/mac80211/ieee80211_rate.c | 47 ++++++++++++++++++++++++++++ net/mac80211/ieee80211_rate.h | 68 ++++++++++++++++++++++++++--------------- net/mac80211/ieee80211_sta.c | 13 +++----- net/mac80211/rc80211_simple.c | 64 ++++++-------------------------------- net/mac80211/tx.c | 42 +++++++++++-------------- 5 files changed, 124 insertions(+), 110 deletions(-) diff --git a/net/mac80211/ieee80211_rate.c b/net/mac80211/ieee80211_rate.c index 7254bd6..a2f8d64 100644 --- a/net/mac80211/ieee80211_rate.c +++ b/net/mac80211/ieee80211_rate.c @@ -146,6 +146,53 @@ static void rate_control_release(struct kref *kref) kfree(ctrl_ref); } +void rate_control_get_rate(struct net_device *dev, + struct ieee80211_hw_mode *mode, struct sk_buff *skb, + struct rate_selection *sel) +{ + struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); + struct rate_control_ref *ref = local->rate_ctrl; + struct ieee80211_sub_if_data *sdata; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + struct sta_info *sta = sta_info_get(local, hdr->addr1); + int i; + u16 fc; + + memset(sel, 0, sizeof(struct rate_selection)); + + /* Send management frames and broadcast/multicast data using lowest + * rate. */ + fc = le16_to_cpu(hdr->frame_control); + if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || + (hdr->addr1[0] & 0x01)) + sel->rate = rate_lowest(local, mode, sta); + + /* If a forced rate is in effect, select it. */ + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) + sel->rate = &mode->rates[sdata->bss->force_unicast_rateidx]; + + /* If we haven't found the rate yet, ask the rate control algo. */ + if (!sel->rate) + ref->ops->get_rate(ref->priv, dev, mode, skb, sel); + + /* Select a non-ERP backup rate. */ + if (!sel->nonerp) { + for (i = 0; i < mode->num_rates - 1; i++) { + struct ieee80211_rate *rate = &mode->rates[i]; + if (sel->rate->rate < rate->rate) + break; + + if (rate_supported(sta, mode, i) && + !(rate->flags & IEEE80211_RATE_ERP)) + sel->nonerp = rate; + } + } + + if (sta) + sta_info_put(sta); +} + struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) { kref_get(&ref->kref); diff --git a/net/mac80211/ieee80211_rate.h b/net/mac80211/ieee80211_rate.h index 2368813..ceb7783 100644 --- a/net/mac80211/ieee80211_rate.h +++ b/net/mac80211/ieee80211_rate.h @@ -18,31 +18,24 @@ #include "ieee80211_i.h" #include "sta_info.h" -#define RATE_CONTROL_NUM_DOWN 20 -#define RATE_CONTROL_NUM_UP 15 - - -struct rate_control_extra { - /* values from rate_control_get_rate() to the caller: */ - struct ieee80211_rate *probe; /* probe with this rate, or NULL for no - * probing */ +struct rate_selection { + /* Selected transmission rate */ + struct ieee80211_rate *rate; + /* Non-ERP rate to use if mac80211 decides it cannot use an ERP rate */ struct ieee80211_rate *nonerp; - - /* parameters from the caller to rate_control_get_rate(): */ - struct ieee80211_hw_mode *mode; - u16 ethertype; + /* probe with this rate, or NULL for no probing */ + struct ieee80211_rate *probe; }; - struct rate_control_ops { struct module *module; const char *name; void (*tx_status)(void *priv, struct net_device *dev, struct sk_buff *skb, struct ieee80211_tx_status *status); - struct ieee80211_rate *(*get_rate)(void *priv, struct net_device *dev, - struct sk_buff *skb, - struct rate_control_extra *extra); + void (*get_rate)(void *priv, struct net_device *dev, + struct ieee80211_hw_mode *mode, struct sk_buff *skb, + struct rate_selection *sel); void (*rate_init)(void *priv, void *priv_sta, struct ieee80211_local *local, struct sta_info *sta); void (*clear)(void *priv); @@ -75,6 +68,9 @@ void ieee80211_rate_control_unregister(struct rate_control_ops *ops); * first available algorithm. */ struct rate_control_ref *rate_control_alloc(const char *name, struct ieee80211_local *local); +void rate_control_get_rate(struct net_device *dev, + struct ieee80211_hw_mode *mode, struct sk_buff *skb, + struct rate_selection *sel); struct rate_control_ref *rate_control_get(struct rate_control_ref *ref); void rate_control_put(struct rate_control_ref *ref); @@ -88,15 +84,6 @@ static inline void rate_control_tx_status(struct ieee80211_local *local, } -static inline struct ieee80211_rate * -rate_control_get_rate(struct ieee80211_local *local, struct net_device *dev, - struct sk_buff *skb, struct rate_control_extra *extra) -{ - struct rate_control_ref *ref = local->rate_ctrl; - return ref->ops->get_rate(ref->priv, dev, skb, extra); -} - - static inline void rate_control_rate_init(struct sta_info *sta, struct ieee80211_local *local) { @@ -142,6 +129,37 @@ static inline void rate_control_remove_sta_debugfs(struct sta_info *sta) #endif } +static inline int +rate_supported(struct sta_info *sta, struct ieee80211_hw_mode *mode, int index) +{ + return (sta == NULL || sta->supp_rates & BIT(index)) && + (mode->rates[index].flags & IEEE80211_RATE_SUPPORTED); +} + +static inline int +rate_lowest_index(struct ieee80211_local *local, struct ieee80211_hw_mode *mode, + struct sta_info *sta) +{ + int i; + + for (i = 0; i < mode->num_rates; i++) { + if (rate_supported(sta, mode, i)) + return i; + } + + /* warn when we cannot find a rate. */ + WARN_ON(i == 0); + + return 0; +} + +static inline struct ieee80211_rate * +rate_lowest(struct ieee80211_local *local, struct ieee80211_hw_mode *mode, + struct sta_info *sta) +{ + return &mode->rates[rate_lowest_index(local, mode, sta)]; +} + /* functions for rate control related to a device */ int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c index 2a321f0..e55a9f4 100644 --- a/net/mac80211/ieee80211_sta.c +++ b/net/mac80211/ieee80211_sta.c @@ -2208,9 +2208,8 @@ static int ieee80211_sta_join_ibss(struct net_device *dev, struct sk_buff *skb; struct ieee80211_mgmt *mgmt; struct ieee80211_tx_control control; - struct ieee80211_rate *rate; struct ieee80211_hw_mode *mode; - struct rate_control_extra extra; + struct rate_selection ratesel; u8 *pos; struct ieee80211_sub_if_data *sdata; @@ -2295,18 +2294,16 @@ static int ieee80211_sta_join_ibss(struct net_device *dev, } memset(&control, 0, sizeof(control)); - memset(&extra, 0, sizeof(extra)); - extra.mode = local->oper_hw_mode; - rate = rate_control_get_rate(local, dev, skb, &extra); - if (!rate) { + rate_control_get_rate(dev, local->oper_hw_mode, skb, &ratesel); + if (!ratesel.rate) { printk(KERN_DEBUG "%s: Failed to determine TX rate " "for IBSS beacon\n", dev->name); break; } control.tx_rate = ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) && - (rate->flags & IEEE80211_RATE_PREAMBLE2)) ? - rate->val2 : rate->val; + (ratesel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ? + ratesel.rate->val2 : ratesel.rate->val; control.antenna_sel_tx = local->hw.conf.antenna_sel_tx; control.power_level = local->hw.conf.power_level; control.flags |= IEEE80211_TXCTL_NO_ACK; diff --git a/net/mac80211/rc80211_simple.c b/net/mac80211/rc80211_simple.c index da72737..c1c8b76 100644 --- a/net/mac80211/rc80211_simple.c +++ b/net/mac80211/rc80211_simple.c @@ -23,6 +23,8 @@ /* This is a minimal implementation of TX rate controlling that can be used * as the default when no improved mechanisms are available. */ +#define RATE_CONTROL_NUM_DOWN 20 +#define RATE_CONTROL_NUM_UP 15 #define RATE_CONTROL_EMERG_DEC 2 #define RATE_CONTROL_INTERVAL (HZ / 20) @@ -87,26 +89,6 @@ static void rate_control_rate_dec(struct ieee80211_local *local, } } - -static struct ieee80211_rate * -rate_control_lowest_rate(struct ieee80211_local *local, - struct ieee80211_hw_mode *mode) -{ - int i; - - for (i = 0; i < mode->num_rates; i++) { - struct ieee80211_rate *rate = &mode->rates[i]; - - if (rate->flags & IEEE80211_RATE_SUPPORTED) - return rate; - } - - printk(KERN_DEBUG "rate_control_lowest_rate - no supported rates " - "found\n"); - return &mode->rates[0]; -} - - struct global_rate_control { int dummy; }; @@ -216,56 +198,32 @@ static void rate_control_simple_tx_status(void *priv, struct net_device *dev, } -static struct ieee80211_rate * +static void rate_control_simple_get_rate(void *priv, struct net_device *dev, + struct ieee80211_hw_mode *mode, struct sk_buff *skb, - struct rate_control_extra *extra) + struct rate_selection *sel) { struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); - struct ieee80211_sub_if_data *sdata; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; - struct ieee80211_hw_mode *mode = extra->mode; struct sta_info *sta; - int rateidx, nonerp_idx; - u16 fc; - - memset(extra, 0, sizeof(*extra)); - - fc = le16_to_cpu(hdr->frame_control); - if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || - (hdr->addr1[0] & 0x01)) { - /* Send management frames and broadcast/multicast data using - * lowest rate. */ - /* TODO: this could probably be improved.. */ - return rate_control_lowest_rate(local, mode); - } + int rateidx; sta = sta_info_get(local, hdr->addr1); - if (!sta) - return rate_control_lowest_rate(local, mode); - - sdata = IEEE80211_DEV_TO_SUB_IF(dev); - if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) - sta->txrate = sdata->bss->force_unicast_rateidx; + if (!sta) { + sel->rate = rate_lowest(local, mode, NULL); + return; + } rateidx = sta->txrate; if (rateidx >= mode->num_rates) rateidx = mode->num_rates - 1; - sta->last_txrate = rateidx; - nonerp_idx = rateidx; - while (nonerp_idx > 0 && - ((mode->rates[nonerp_idx].flags & IEEE80211_RATE_ERP) || - !(mode->rates[nonerp_idx].flags & IEEE80211_RATE_SUPPORTED) || - !(sta->supp_rates & BIT(nonerp_idx)))) - nonerp_idx--; - extra->nonerp = &mode->rates[nonerp_idx]; - sta_info_put(sta); - return &mode->rates[rateidx]; + sel->rate = &mode->rates[rateidx]; } diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 9ccf4b5..0ccc03d 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -567,21 +567,17 @@ ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx) static ieee80211_txrx_result ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx) { - struct rate_control_extra extra; + struct rate_selection rsel; if (likely(!tx->u.tx.rate)) { - memset(&extra, 0, sizeof(extra)); - extra.mode = tx->u.tx.mode; - extra.ethertype = tx->ethertype; - - tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, - tx->skb, &extra); - if (unlikely(extra.probe != NULL)) { + rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel); + tx->u.tx.rate = rsel.rate; + if (unlikely(rsel.probe != NULL)) { tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE; tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val; - tx->u.tx.rate = extra.probe; + tx->u.tx.rate = rsel.probe; } else tx->u.tx.control->alt_retry_rate = -1; @@ -592,14 +588,14 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx) if (tx->u.tx.mode->mode == MODE_IEEE80211G && (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) && - (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) { + (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) { tx->u.tx.last_frag_rate = tx->u.tx.rate; - if (extra.probe) + if (rsel.probe) tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG; else tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; - tx->u.tx.rate = extra.nonerp; - tx->u.tx.control->rate = extra.nonerp; + tx->u.tx.rate = rsel.nonerp; + tx->u.tx.control->rate = rsel.nonerp; tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE; } else { tx->u.tx.last_frag_rate = tx->u.tx.rate; @@ -1665,8 +1661,7 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id, struct net_device *bdev; struct ieee80211_sub_if_data *sdata = NULL; struct ieee80211_if_ap *ap = NULL; - struct ieee80211_rate *rate; - struct rate_control_extra extra; + struct rate_selection rsel; u8 *b_head, *b_tail; int bh_len, bt_len; @@ -1710,14 +1705,13 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id, } if (control) { - memset(&extra, 0, sizeof(extra)); - extra.mode = local->oper_hw_mode; - - rate = rate_control_get_rate(local, local->mdev, skb, &extra); - if (!rate) { + rate_control_get_rate(local->mdev, local->oper_hw_mode, skb, + &rsel); + if (!rsel.rate) { if (net_ratelimit()) { - printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate " - "found\n", wiphy_name(local->hw.wiphy)); + printk(KERN_DEBUG "%s: ieee80211_beacon_get: " + "no rate found\n", + wiphy_name(local->hw.wiphy)); } dev_kfree_skb(skb); return NULL; @@ -1725,8 +1719,8 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id, control->tx_rate = ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) && - (rate->flags & IEEE80211_RATE_PREAMBLE2)) ? - rate->val2 : rate->val; + (rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ? + rsel.rate->val2 : rsel.rate->val; control->antenna_sel_tx = local->hw.conf.antenna_sel_tx; control->power_level = local->hw.conf.power_level; control->flags |= IEEE80211_TXCTL_NO_ACK; -- 1.5.3.4