| Message ID | 20211128090753.958-1-jelonek.jonas@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] ath9k: switch to rate table based lookup | expand |
Jonas Jelonek <jelonek.jonas@gmail.com> wrote: > This patch changes mac80211 rate control for the ath9k driver. The rate lookup > per packet is changed from legacy usage of ieee80211_get_tx_rates() to the new > rate table based lookup in struct ieee80211_sta->rates. > > The most recent rate control API, introduced with commit 0d528d85c519 > ("mac80211: improve the rate control API"), allows drivers to directly get > rates from ieee80211_sta->rates. This is not used by every driver yet, the > translation/merge is currently performed in ieee80211_get_tx_rates. This patch > changes the behaviour and avoids the call to ieee80211_get_tx_rates and > subsequent calls. ath9k now directly reads rates from sta->rates into its rate > table. Cause ath9k does not expect rate selection in SKB->CB, the table merge > does not consider rate array in SKB->CB except for the first entry (used for > probing). > > Tested with a 8devices Rambutan with QCA9558 SoC by performing two runs, one > without the patch and one with. Generated traffic between AP and multiple STAs > in each run, measured throughput and captured rc_stats. Comparison of both > runs resulted in same rate selection and no performance loss or other negative > effects. > > Co-developed-by: Thomas Huehn <thomas.huehn@hs-nordhausen.de> > Signed-off-by: Thomas Huehn <thomas.huehn@hs-nordhausen.de> > Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com> > Acked-by: Toke Høiland-Jørgensen <toke@redhat.com> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Patch applied to ath-next branch of ath.git, thanks. 7f3a6f5dd207 ath9k: switch to rate table based lookup
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c index 5691bd6eb82c..d0caf1de2bde 100644 --- a/drivers/net/wireless/ath/ath9k/xmit.c +++ b/drivers/net/wireless/ath/ath9k/xmit.c @@ -154,11 +154,52 @@ static void ath_send_bar(struct ath_atx_tid *tid, u16 seqno) seqno << IEEE80211_SEQ_SEQ_SHIFT); } +static bool ath_merge_ratetbl(struct ieee80211_sta *sta, struct ath_buf *bf, + struct ieee80211_tx_info *tx_info) +{ + struct ieee80211_sta_rates *ratetbl; + u8 i; + + if (!sta) + return false; + + ratetbl = rcu_dereference(sta->rates); + if (!ratetbl) + return false; + + if (tx_info->control.rates[0].idx < 0 || + tx_info->control.rates[0].count == 0) + { + i = 0; + } else { + bf->rates[0] = tx_info->control.rates[0]; + i = 1; + } + + for ( ; i < IEEE80211_TX_MAX_RATES; i++) { + bf->rates[i].idx = ratetbl->rate[i].idx; + bf->rates[i].flags = ratetbl->rate[i].flags; + if (tx_info->control.use_rts) + bf->rates[i].count = ratetbl->rate[i].count_rts; + else if (tx_info->control.use_cts_prot) + bf->rates[i].count = ratetbl->rate[i].count_cts; + else + bf->rates[i].count = ratetbl->rate[i].count; + } + + return true; +} + static void ath_set_rates(struct ieee80211_vif *vif, struct ieee80211_sta *sta, struct ath_buf *bf) { - ieee80211_get_tx_rates(vif, sta, bf->bf_mpdu, bf->rates, - ARRAY_SIZE(bf->rates)); + struct ieee80211_tx_info *tx_info; + + tx_info = IEEE80211_SKB_CB(bf->bf_mpdu); + + if (!ath_merge_ratetbl(sta, bf, tx_info)) + ieee80211_get_tx_rates(vif, sta, bf->bf_mpdu, bf->rates, + ARRAY_SIZE(bf->rates)); } static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,