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 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
  18 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
  19 @@ -372,15 +372,16 @@ static void rt2x00queue_create_tx_descri
  20
  21         /*
  22          * Determine IFS values
  23 -        * - Use TXOP_BACKOFF for management frames except beacons
  24 +        * - Use TXOP_BACKOFF for probe and management frames except beacons
  25          * - Use TXOP_SIFS for fragment bursts
  26          * - Use TXOP_HTTXOP for everything else
  27          *
  28          * Note: rt2800 devices won't use CTS protection (if used)
  29          * for frames not transmitted with TXOP_HTTXOP
  30          */
  31 -       if (ieee80211_is_mgmt(hdr->frame_control) &&
  32 -           !ieee80211_is_beacon(hdr->frame_control))
  33 +       if ((ieee80211_is_mgmt(hdr->frame_control) &&
  34 +            !ieee80211_is_beacon(hdr->frame_control)) ||
  35 +           (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE))
  36                 txdesc->u.ht.txop = TXOP_BACKOFF;
  37         else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
  38                 txdesc->u.ht.txop = TXOP_SIFS;