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ath10k: report estimated frame transmit airtime to improve fairness

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The airtime of a transmitted frame will be estimated from last used tx rate
which the firmware reports with the peer stats feature
(WMI_SERVICE_PEER_STATS). The airtime is computed on the tx path and it
will be reported to mac80211 upon tx completion.

This change is based on Kan's orginal commit in Chromium tree
("CHROMIUM: ath10k: Implementing airtime fairness based TX scheduler")
ref: https://chromium-review.googlesource.com/588190

Tested on QCA4019 with firmware version 10.4-3.2.1.1-00015
Tested on QCA9984 with firmware version 10.4-3.9.0.1-00005

Signed-off-by: Kan Yan <kyan@google.com>
[rmanohar@codeaurora.org: ported only the airtime computation]
Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
[toke@redhat.com: Rebase to mac80211-next, add test note]
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Kan Yan
2019-02-11 18:47:52 +02:00
committed by Kalle Valo
parent bb2edb7335
commit d1ce37b783
4 changed files with 61 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
drivers/net/wireless/ath/ath10k/mac.c
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@@ -3544,7 +3544,7 @@ static void ath10k_tx_h_add_p2p_noa_ie(struct ath10k *ar,
static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
struct ieee80211_vif *vif,
struct ieee80211_txq *txq,
struct sk_buff *skb)
struct sk_buff *skb, u16 airtime)
{
struct ieee80211_hdr *hdr = (void *)skb->data;
struct ath10k_skb_cb *cb = ATH10K_SKB_CB(skb);
@@ -3561,6 +3561,7 @@ static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
cb->vif = vif;
cb->txq = txq;
cb->airtime_est = airtime;
}
bool ath10k_mac_tx_frm_has_freq(struct ath10k *ar)
@@ -3948,6 +3949,49 @@ static bool ath10k_mac_tx_can_push(struct ieee80211_hw *hw,
return false;
}
/* Return estimated airtime in microsecond, which is calculated using last
* reported TX rate. This is just a rough estimation because host driver has no
* knowledge of the actual transmit rate, retries or aggregation. If actual
* airtime can be reported by firmware, then delta between estimated and actual
* airtime can be adjusted from deficit.
*/
#define IEEE80211_ATF_OVERHEAD 100 /* IFS + some slot time */
#define IEEE80211_ATF_OVERHEAD_IFS 16 /* IFS only */
static u16 ath10k_mac_update_airtime(struct ath10k *ar,
struct ieee80211_txq *txq,
struct sk_buff *skb)
{
struct ath10k_sta *arsta;
u32 pktlen;
u16 airtime = 0;
if (!txq || !txq->sta)
return airtime;
spin_lock_bh(&ar->data_lock);
arsta = (struct ath10k_sta *)txq->sta->drv_priv;
pktlen = skb->len + 38; /* Assume MAC header 30, SNAP 8 for most case */
if (arsta->last_tx_bitrate) {
/* airtime in us, last_tx_bitrate in 100kbps */
airtime = (pktlen * 8 * (1000 / 100))
/ arsta->last_tx_bitrate;
/* overhead for media access time and IFS */
airtime += IEEE80211_ATF_OVERHEAD_IFS;
} else {
/* This is mostly for throttle excessive BC/MC frames, and the
* airtime/rate doesn't need be exact. Airtime of BC/MC frames
* in 2G get some discount, which helps prevent very low rate
* frames from being blocked for too long.
*/
airtime = (pktlen * 8 * (1000 / 100)) / 60; /* 6M */
airtime += IEEE80211_ATF_OVERHEAD;
}
spin_unlock_bh(&ar->data_lock);
return airtime;
}
int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
struct ieee80211_txq *txq)
{
@@ -3963,6 +4007,7 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
size_t skb_len;
bool is_mgmt, is_presp;
int ret;
u16 airtime;
spin_lock_bh(&ar->htt.tx_lock);
ret = ath10k_htt_tx_inc_pending(htt);
@@ -3980,7 +4025,8 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
return -ENOENT;
}
ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb);
airtime = ath10k_mac_update_airtime(ar, txq, skb);
ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb, airtime);
skb_len = skb->len;
txmode = ath10k_mac_tx_h_get_txmode(ar, vif, sta, skb);
@@ -4247,8 +4293,10 @@ static void ath10k_mac_op_tx(struct ieee80211_hw *hw,
bool is_mgmt;
bool is_presp;
int ret;
u16 airtime;
ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb);
airtime = ath10k_mac_update_airtime(ar, txq, skb);
ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb, airtime);
txmode = ath10k_mac_tx_h_get_txmode(ar, vif, sta, skb);
txpath = ath10k_mac_tx_h_get_txpath(ar, skb, txmode);
@@ -8604,6 +8652,9 @@ int ath10k_mac_register(struct ath10k *ar)
wiphy_ext_feature_set(ar->hw->wiphy,
NL80211_EXT_FEATURE_ACK_SIGNAL_SUPPORT);
if (ath10k_peer_stats_enabled(ar))
wiphy_ext_feature_set(ar->hw->wiphy,
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS);
/*
* on LL hardware queues are managed entirely by the FW
* so we only advertise to mac we can do the queues thing