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mac80211: add multi-rate retry support

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This patch adjusts the rate control API to allow multi-rate retry
if supported by the driver. The ieee80211_hw struct specifies how
many alternate rate selections the driver supports.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2008-10-05 18:04:24 +02:00 committed by John W. Linville
parent 76708dee38
commit 870abdf671
7 changed files with 39 additions and 14 deletions
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1
drivers/net/wireless/b43/main.c
View File

@ -4588,6 +4588,7 @@ static int b43_wireless_init(struct ssb_device *dev)
BIT(NL80211_IFTYPE_ADHOC);
hw->queues = b43_modparam_qos ? 4 : 1;
hw->max_altrates = 1;
SET_IEEE80211_DEV(hw, dev->dev);
if (is_valid_ether_addr(sprom->et1mac))
SET_IEEE80211_PERM_ADDR(hw, sprom->et1mac);

2
drivers/net/wireless/b43/xmit.c
View File

@ -208,7 +208,7 @@ int b43_generate_txhdr(struct b43_wldev *dev,
txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
rate_ofdm = b43_is_ofdm_rate(rate);
fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info) ? : txrate;
fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
rate_fb = fbrate->hw_value;
rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);

1
drivers/net/wireless/b43legacy/main.c
View File

@ -3710,6 +3710,7 @@ static int b43legacy_wireless_init(struct ssb_device *dev)
BIT(NL80211_IFTYPE_WDS) |
BIT(NL80211_IFTYPE_ADHOC);
hw->queues = 1; /* FIXME: hardware has more queues */
hw->max_altrates = 1;
SET_IEEE80211_DEV(hw, dev->dev);
if (is_valid_ether_addr(sprom->et1mac))
SET_IEEE80211_PERM_ADDR(hw, sprom->et1mac);

2
drivers/net/wireless/b43legacy/xmit.c
View File

@ -210,7 +210,7 @@ static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
rate = tx_rate->hw_value;
rate_ofdm = b43legacy_is_ofdm_rate(rate);
rate_fb = ieee80211_get_alt_retry_rate(dev->wl->hw, info) ? : tx_rate;
rate_fb = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : tx_rate;
rate_fb_ofdm = b43legacy_is_ofdm_rate(rate_fb->hw_value);
txhdr->mac_frame_ctl = wlhdr->frame_control;

5
drivers/net/wireless/rtl8180_dev.c
View File

@ -292,8 +292,8 @@ static int rtl8180_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
entry->plcp_len = cpu_to_le16(plcp_len);
entry->tx_buf = cpu_to_le32(mapping);
entry->frame_len = cpu_to_le32(skb->len);
entry->flags2 = info->control.alt_retry_rate_idx >= 0 ?
ieee80211_get_alt_retry_rate(dev, info)->bitrate << 4 : 0;
entry->flags2 = info->control.retries[0].rate_idx >= 0 ?
ieee80211_get_alt_retry_rate(dev, info, 0)->bitrate << 4 : 0;
entry->retry_limit = info->control.retry_limit;
entry->flags = cpu_to_le32(tx_flags);
__skb_queue_tail(&ring->queue, skb);
@ -855,6 +855,7 @@ static int __devinit rtl8180_probe(struct pci_dev *pdev,
priv = dev->priv;
priv->pdev = pdev;
dev->max_altrates = 1;
SET_IEEE80211_DEV(dev, &pdev->dev);
pci_set_drvdata(pdev, dev);

29
include/net/mac80211.h
View File

@ -292,6 +292,20 @@ enum mac80211_tx_control_flags {
#define IEEE80211_TX_INFO_DRIVER_DATA_PTRS \
(IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *))
/* maximum number of alternate rate retry stages */
#define IEEE80211_TX_MAX_ALTRATE 3
/**
* struct ieee80211_tx_altrate - alternate rate selection/status
*
* @rate_idx: rate index to attempt to send with
* @limit: number of retries before fallback
*/
struct ieee80211_tx_altrate {
s8 rate_idx;
u8 limit;
};
/**
* struct ieee80211_tx_info - skb transmit information
*
@ -335,12 +349,14 @@ struct ieee80211_tx_info {
struct ieee80211_key_conf *hw_key;
struct ieee80211_sta *sta;
unsigned long jiffies;
s8 rts_cts_rate_idx, alt_retry_rate_idx;
s8 rts_cts_rate_idx;
u8 retry_limit;
struct ieee80211_tx_altrate retries[IEEE80211_TX_MAX_ALTRATE];
} control;
struct {
u64 ampdu_ack_map;
int ack_signal;
struct ieee80211_tx_altrate retries[IEEE80211_TX_MAX_ALTRATE + 1];
u8 retry_count;
bool excessive_retries;
u8 ampdu_ack_len;
@ -828,6 +844,9 @@ enum ieee80211_hw_flags {
* within &struct ieee80211_vif.
* @sta_data_size: size (in bytes) of the drv_priv data area
* within &struct ieee80211_sta.
*
* @max_altrates: maximum number of alternate rate retry stages
* @max_altrate_tries: maximum number of tries for each stage
*/
struct ieee80211_hw {
struct ieee80211_conf conf;
@ -844,6 +863,8 @@ struct ieee80211_hw {
u16 ampdu_queues;
u16 max_listen_interval;
s8 max_signal;
u8 max_altrates;
u8 max_altrate_tries;
};
struct ieee80211_hw *wiphy_to_hw(struct wiphy *wiphy);
@ -900,11 +921,11 @@ ieee80211_get_rts_cts_rate(const struct ieee80211_hw *hw,
static inline struct ieee80211_rate *
ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
const struct ieee80211_tx_info *c)
const struct ieee80211_tx_info *c, int idx)
{
if (c->control.alt_retry_rate_idx < 0)
if (c->control.retries[idx].rate_idx < 0)
return NULL;
return &hw->wiphy->bands[c->band]->bitrates[c->control.alt_retry_rate_idx];
return &hw->wiphy->bands[c->band]->bitrates[c->control.retries[idx].rate_idx];
}
/**

13
net/mac80211/tx.c
View File

@ -454,15 +454,16 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
if (unlikely(rsel.probe_idx >= 0)) {
info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
info->control.alt_retry_rate_idx = tx->rate_idx;
info->control.retries[0].rate_idx = tx->rate_idx;
info->control.retries[0].limit = tx->local->hw.max_altrate_tries;
tx->rate_idx = rsel.probe_idx;
} else
info->control.alt_retry_rate_idx = -1;
} else if (info->control.retries[0].limit == 0)
info->control.retries[0].rate_idx = -1;
if (unlikely(tx->rate_idx < 0))
return TX_DROP;
} else
info->control.alt_retry_rate_idx = -1;
info->control.retries[0].rate_idx = -1;
if (tx->sdata->bss_conf.use_cts_prot &&
(tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
@ -521,7 +522,7 @@ ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
* frames.
* TODO: The last fragment could still use multiple retry
* rates. */
info->control.alt_retry_rate_idx = -1;
info->control.retries[0].rate_idx = -1;
}
/* Use CTS protection for unicast frames sent using extended rates if
@ -551,7 +552,7 @@ ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
int idx;
/* Do not use multiple retry rates when using RTS/CTS */
info->control.alt_retry_rate_idx = -1;
info->control.retries[0].rate_idx = -1;
/* Use min(data rate, max base rate) as CTS/RTS rate */
rate = &sband->bitrates[tx->rate_idx];