package/kernel/mac80211/patches/020-16-rt2800-use-TXOP_BACKOFF-for-probe-frames.patch

   1 From fb47ada8dc3c30c8e7b415da155742b49536c61e Mon Sep 17 00:00:00 2001
   2 From: Stanislaw Gruszka <sgruszka@redhat.com>
   3 Date: Wed, 15 Feb 2017 10:25:12 +0100
   4 Subject: [PATCH 16/19] rt2800: use TXOP_BACKOFF for probe frames
   5
   6 Even if we do not set AMPDU bit in TXWI, device still can aggregate
   7 frame and send it with rate not corresponding to requested. That mean
   8 we can do not sent probe frames with requested rate. To prevent that
   9 use TXOP_BACKOFF for probe frames.
  10
  11 Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
  12 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  13 ---
  14  drivers/net/wireless/ralink/rt2x00/rt2x00queue.c | 7 ++++---
  15  1 file changed, 4 insertions(+), 3 deletions(-)
  16
  17 diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
  18 index e1660b92b20c..a2c1ca5c76d1 100644
  19 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
  20 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
  21 @@ -372,15 +372,16 @@ static void rt2x00queue_create_tx_descriptor_ht(struct rt2x00_dev *rt2x00dev,
  22
  23         /*
  24          * Determine IFS values
  25 -        * - Use TXOP_BACKOFF for management frames except beacons
  26 +        * - Use TXOP_BACKOFF for probe and management frames except beacons
  27          * - Use TXOP_SIFS for fragment bursts
  28          * - Use TXOP_HTTXOP for everything else
  29          *
  30          * Note: rt2800 devices won't use CTS protection (if used)
  31          * for frames not transmitted with TXOP_HTTXOP
  32          */
  33 -       if (ieee80211_is_mgmt(hdr->frame_control) &&
  34 -           !ieee80211_is_beacon(hdr->frame_control))
  35 +       if ((ieee80211_is_mgmt(hdr->frame_control) &&
  36 +            !ieee80211_is_beacon(hdr->frame_control)) ||
  37 +           (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE))
  38                 txdesc->u.ht.txop = TXOP_BACKOFF;
  39         else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
  40                 txdesc->u.ht.txop = TXOP_SIFS;
  41 --
  42 2.12.1
  43