package/kernel/mac80211/patches/rt2x00/032-rt2x00-do-not-increment-sequence-number-while-re-tra.patch

   1 From 746ba11f170603bf1eaade817553a6c2e9135bbe Mon Sep 17 00:00:00 2001
   2 From: Vijayakumar Durai <vijayakumar.durai1@vivint.com>
   3 Date: Wed, 27 Mar 2019 11:03:17 +0100
   4 Subject: [PATCH] rt2x00: do not increment sequence number while
   5  re-transmitting
   6
   7 Currently rt2x00 devices retransmit the management frames with
   8 incremented sequence number if hardware is assigning the sequence.
   9
  10 This is HW bug fixed already for non-QOS data frames, but it should
  11 be fixed for management frames except beacon.
  12
  13 Without fix retransmitted frames have wrong SN:
  14
  15  AlphaNet_e8:fb:36 Vivotek_52:31:51 Authentication, SN=1648, FN=0, Flags=........C Frame is not being retransmitted 1648 1
  16  AlphaNet_e8:fb:36 Vivotek_52:31:51 Authentication, SN=1649, FN=0, Flags=....R...C Frame is being retransmitted 1649 1
  17  AlphaNet_e8:fb:36 Vivotek_52:31:51 Authentication, SN=1650, FN=0, Flags=....R...C Frame is being retransmitted 1650 1
  18
  19 With the fix SN stays correctly the same:
  20
  21  88:6a:e3:e8:f9:a2 8c:f5:a3:88:76:87 Authentication, SN=1450, FN=0, Flags=........C
  22  88:6a:e3:e8:f9:a2 8c:f5:a3:88:76:87 Authentication, SN=1450, FN=0, Flags=....R...C
  23  88:6a:e3:e8:f9:a2 8c:f5:a3:88:76:87 Authentication, SN=1450, FN=0, Flags=....R...C
  24
  25 Cc: stable@vger.kernel.org
  26 Signed-off-by: Vijayakumar Durai <vijayakumar.durai1@vivint.com>
  27 [sgruszka: simplify code, change comments and changelog]
  28 Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
  29 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  30 ---
  31  drivers/net/wireless/ralink/rt2x00/rt2x00.h      |  1 -
  32  drivers/net/wireless/ralink/rt2x00/rt2x00mac.c   | 10 ----------
  33  drivers/net/wireless/ralink/rt2x00/rt2x00queue.c | 15 +++++++++------
  34  3 files changed, 9 insertions(+), 17 deletions(-)
  35
  36 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
  37 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
  38 @@ -673,7 +673,6 @@ enum rt2x00_state_flags {
  39         CONFIG_CHANNEL_HT40,
  40         CONFIG_POWERSAVING,
  41         CONFIG_HT_DISABLED,
  42 -       CONFIG_QOS_DISABLED,
  43         CONFIG_MONITORING,
  44
  45         /*
  46 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c
  47 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c
  48 @@ -642,19 +642,9 @@ void rt2x00mac_bss_info_changed(struct i
  49                         rt2x00dev->intf_associated--;
  50
  51                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
  52 -
  53 -               clear_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
  54         }
  55
  56         /*
  57 -        * Check for access point which do not support 802.11e . We have to
  58 -        * generate data frames sequence number in S/W for such AP, because
  59 -        * of H/W bug.
  60 -        */
  61 -       if (changes & BSS_CHANGED_QOS && !bss_conf->qos)
  62 -               set_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
  63 -
  64 -       /*
  65          * When the erp information has changed, we should perform
  66          * additional configuration steps. For all other changes we are done.
  67          */
  68 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
  69 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
  70 @@ -201,15 +201,18 @@ static void rt2x00queue_create_tx_descri
  71         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_SW_SEQNO)) {
  72                 /*
  73                  * rt2800 has a H/W (or F/W) bug, device incorrectly increase
  74 -                * seqno on retransmited data (non-QOS) frames. To workaround
  75 -                * the problem let's generate seqno in software if QOS is
  76 -                * disabled.
  77 +                * seqno on retransmitted data (non-QOS) and management frames.
  78 +                * To workaround the problem let's generate seqno in software.
  79 +                * Except for beacons which are transmitted periodically by H/W
  80 +                * hence hardware has to assign seqno for them.
  81                  */
  82 -               if (test_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags))
  83 -                       __clear_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
  84 -               else
  85 +               if (ieee80211_is_beacon(hdr->frame_control)) {
  86 +                       __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
  87                         /* H/W will generate sequence number */
  88                         return;
  89 +               }
  90 +
  91 +               __clear_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
  92         }
  93
  94         /*