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@xxxxxxxxxxx>
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -292,6 +292,20 @@
#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_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 @@
* 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 @@
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 @@
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];
}
/**
--- a/drivers/net/wireless/b43/xmit.c
+++ b/drivers/net/wireless/b43/xmit.c
@@ -208,7 +208,7 @@
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);
--- a/drivers/net/wireless/b43legacy/xmit.c
+++ b/drivers/net/wireless/b43legacy/xmit.c
@@ -210,7 +210,7 @@
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;
--- a/drivers/net/wireless/rtl8180_dev.c
+++ b/drivers/net/wireless/rtl8180_dev.c
@@ -292,8 +292,8 @@
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);
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -454,15 +454,16 @@
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 @@
* 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 @@
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];
--
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