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779b89c757
Currently, dynack was only tested upstream using AP/STA mode. Testing it on IBSS, showed that late-ack detection was broken. This is caused due to dynack using Association Request/Response frames for late-ack detection, which IBSS does not use. Also allowing Authentication frames here solves this. A second issue also got fixed, which was also seen AP/STA mode: When a station was added, the estimated value would be exponentially averaged using 0 as a starting point. This means that on larger distances, the ack timeout was still not high enough before synchronizing would run out of late-ack's for estimation. Fix this by using the initial estimated value as a baseline and only start averaging in the following estimation rounds. Test setup: - 2x identical devices: RB912UAG-5HPnD + 19dB sector - IBSS - 2x2 802.11an (ar9340), HT20, long GI - RSSI's -70 / -71 - Real distance: 23910 meter Results (60s iperf runs): Fixed coverage class 54 (up to 24300m): * 21.5 Mbits/sec Dynack: * 28.9 Mbits/sec Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
28 lines
1.1 KiB
Diff
28 lines
1.1 KiB
Diff
From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
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Date: Fri, 2 Nov 2018 21:49:55 +0100
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Subject: [PATCH] ath9k: dynack: use authentication messages for 'late' ack
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In order to properly support dynack in ad-hoc mode running
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wpa_supplicant, take into account authentication frames for
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'late ack' detection. This patch has been tested on devices
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mounted on offshore high-voltage stations connected through
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~24Km link
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Reported-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
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Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
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Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
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---
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--- a/drivers/net/wireless/ath/ath9k/dynack.c
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+++ b/drivers/net/wireless/ath/ath9k/dynack.c
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@@ -187,7 +187,8 @@ void ath_dynack_sample_tx_ts(struct ath_
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/* late ACK */
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if (ts->ts_status & ATH9K_TXERR_XRETRY) {
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if (ieee80211_is_assoc_req(hdr->frame_control) ||
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- ieee80211_is_assoc_resp(hdr->frame_control)) {
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+ ieee80211_is_assoc_resp(hdr->frame_control) ||
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+ ieee80211_is_auth(hdr->frame_control)) {
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ath_dbg(common, DYNACK, "late ack\n");
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ath9k_hw_setslottime(ah, (LATEACK_TO - 3) / 2);
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ath9k_hw_set_ack_timeout(ah, LATEACK_TO);
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