mac80211: rt2x00: no longer use TXOP_BACKOFF for probe frames

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

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry-picked from commit f4a639a3d7d40b4f63c431c2d554c479fbcc6b74)

diff --git a/package/kernel/mac80211/Makefile b/package/kernel/mac80211/Makefile
index 0cdce6386db78cb72883d32bd6c00ccba1325083..0a4cbc8ab4d4af740c68cb1b3430ebe93b1335d5 100644 (file)
--- a/package/kernel/mac80211/Makefile
+++ b/package/kernel/mac80211/Makefile
@@ -11,7 +11,7 @@ include $(INCLUDE_DIR)/kernel.mk
 PKG_NAME:=mac80211
 
 PKG_VERSION:=2017-01-31
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 PKG_SOURCE_URL:=http://mirror2.openwrt.org/sources
 PKG_BACKPORT_VERSION:=
 PKG_HASH:=75e6d39e34cf156212a2509172a4a62b673b69eb4a1d9aaa565f7fa719fa2317

diff --git a/package/kernel/mac80211/patches/090-Revert-rt2800-use-TXOP_BACKOFF-for-probe-frames.patch b/package/kernel/mac80211/patches/090-Revert-rt2800-use-TXOP_BACKOFF-for-probe-frames.patch
new file mode 100644 (file)
index 0000000..3438051
--- /dev/null
+++ b/package/kernel/mac80211/patches/090-Revert-rt2800-use-TXOP_BACKOFF-for-probe-frames.patch
@@ -0,0 +1,45 @@
+From 52a192362932f333a7ebafd581c4d9b81da2fec8 Mon Sep 17 00:00:00 2001
+From: Stanislaw Gruszka <sgruszka@redhat.com>
+Date: Mon, 28 May 2018 13:25:06 +0200
+Subject: [PATCH] Revert "rt2800: use TXOP_BACKOFF for probe frames"
+
+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>
+Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
+---
+ 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;
+-- 
+2.17.1
+