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mac80211: rt2x00: no longer use TXOP_BACKOFF for probe frames

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Import a revert-commit from Stanislaw Gruszka which significantly
improves WiFi performance on rt2x00 based hardware.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2018-05-28 15:45:43 +02:00
parent 55f3731002
commit f4a639a3d7
2 changed files with 48 additions and 1 deletions
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2
package/kernel/mac80211/Makefile
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@ -11,7 +11,7 @@ include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=mac80211
PKG_VERSION:=2017-11-01
PKG_RELEASE:=8
PKG_RELEASE:=9
PKG_SOURCE_URL:=http://mirror2.openwrt.org/sources
PKG_HASH:=8437ab7886b988c8152e7a4db30b7f41009e49a3b2cb863edd05da1ecd7eb05a

47
package/kernel/mac80211/patches/090-Revert-rt2800-use-TXOP_BACKOFF-for-probe-frames.patch Normal file
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@ -0,0 +1,47 @@
From patchwork Mon May 28 11:25:06 2018
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Revert "rt2800: use TXOP_BACKOFF for probe frames"
From: Stanislaw Gruszka <sgruszka@redhat.com>
X-Patchwork-Id: 10431861
Message-Id: <1527506706-6488-1-git-send-email-sgruszka@redhat.com>
To: linux-wireless@vger.kernel.org
Date: Mon, 28 May 2018 13:25:06 +0200
This reverts commit fb47ada8dc3c30c8e7b415da155742b49536c61e.
In some situations when we set TXOP_BACKOFF, the probe frame is
not sent at all. What it worse then sending probe frame as part
of AMPDU and can degrade 11n performance to 11g rates.
Cc: stable@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
drivers/net/wireless/ralink/rt2x00/rt2x00queue.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
index a6884e73d2ab..7ddee980048b 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
@@ -372,16 +372,15 @@ static void rt2x00queue_create_tx_descriptor_ht(struct rt2x00_dev *rt2x00dev,
/*
* Determine IFS values
- * - Use TXOP_BACKOFF for probe and management frames except beacons
+ * - Use TXOP_BACKOFF for management frames except beacons
* - Use TXOP_SIFS for fragment bursts
* - Use TXOP_HTTXOP for everything else
*
* Note: rt2800 devices won't use CTS protection (if used)
* for frames not transmitted with TXOP_HTTXOP
*/
- if ((ieee80211_is_mgmt(hdr->frame_control) &&
- !ieee80211_is_beacon(hdr->frame_control)) ||
- (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE))
+ if (ieee80211_is_mgmt(hdr->frame_control) &&
+ !ieee80211_is_beacon(hdr->frame_control))
txdesc->u.ht.txop = TXOP_BACKOFF;
else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
txdesc->u.ht.txop = TXOP_SIFS;