package/kernel/mac80211/patches/rt2x00/021-rt2800-partially-restore-old-mmio-txstatus-behaviour.patch

   1 From 91a5340db0526b7263bc8da14b120ea3129b5f28 Mon Sep 17 00:00:00 2001
   2 From: Stanislaw Gruszka <sgruszka@redhat.com>
   3 Date: Sat, 9 Feb 2019 12:08:31 +0100
   4 Subject: [PATCH 21/28] rt2800: partially restore old mmio txstatus behaviour
   5
   6 Do not disable txstatus interrupt and add quota of processed tx statuses in
   7 one tasklet. Quota is needed to allow to fed device with new frames during
   8 processing of tx statuses.
   9
  10 Patch fixes about 15% performance degradation on some scenarios coused by
  11 0b0d556e0ebb ("rt2800mmio: use txdone/txstatus routines from lib").
  12
  13 Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
  14 ---
  15  .../net/wireless/ralink/rt2x00/rt2800lib.c    |  4 +--
  16  .../net/wireless/ralink/rt2x00/rt2800lib.h    |  2 +-
  17  .../net/wireless/ralink/rt2x00/rt2800mmio.c   | 30 +++++--------------
  18  .../net/wireless/ralink/rt2x00/rt2800usb.c    |  2 +-
  19  4 files changed, 12 insertions(+), 26 deletions(-)
  20
  21 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  22 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  23 @@ -1100,7 +1100,7 @@ void rt2800_txdone_entry(struct queue_en
  24  }
  25  EXPORT_SYMBOL_GPL(rt2800_txdone_entry);
  26
  27 -void rt2800_txdone(struct rt2x00_dev *rt2x00dev)
  28 +void rt2800_txdone(struct rt2x00_dev *rt2x00dev, unsigned int quota)
  29  {
  30         struct data_queue *queue;
  31         struct queue_entry *entry;
  32 @@ -1108,7 +1108,7 @@ void rt2800_txdone(struct rt2x00_dev *rt
  33         u8 qid;
  34         bool match;
  35
  36 -       while (kfifo_get(&rt2x00dev->txstatus_fifo, &reg)) {
  37 +       while (quota-- > 0 && kfifo_get(&rt2x00dev->txstatus_fifo, &reg)) {
  38                 /*
  39                  * TX_STA_FIFO_PID_QUEUE is a 2-bit field, thus qid is
  40                  * guaranteed to be one of the TX QIDs .
  41 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.h
  42 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.h
  43 @@ -195,7 +195,7 @@ void rt2800_process_rxwi(struct queue_en
  44
  45  void rt2800_txdone_entry(struct queue_entry *entry, u32 status, __le32 *txwi,
  46                          bool match);
  47 -void rt2800_txdone(struct rt2x00_dev *rt2x00dev);
  48 +void rt2800_txdone(struct rt2x00_dev *rt2x00dev, unsigned int quota);
  49  void rt2800_txdone_nostatus(struct rt2x00_dev *rt2x00dev);
  50  bool rt2800_txstatus_timeout(struct rt2x00_dev *rt2x00dev);
  51
  52 --- a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
  53 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
  54 @@ -255,20 +255,6 @@ void rt2800mmio_autowake_tasklet(unsigne
  55  }
  56  EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);
  57
  58 -static void rt2800mmio_txdone(struct rt2x00_dev *rt2x00dev)
  59 -{
  60 -       bool timeout = false;
  61 -
  62 -       while (!kfifo_is_empty(&rt2x00dev->txstatus_fifo) ||
  63 -              (timeout = rt2800_txstatus_timeout(rt2x00dev))) {
  64 -
  65 -               rt2800_txdone(rt2x00dev);
  66 -
  67 -               if (timeout)
  68 -                       rt2800_txdone_nostatus(rt2x00dev);
  69 -       }
  70 -}
  71 -
  72  static bool rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev)
  73  {
  74         u32 status;
  75 @@ -305,14 +291,11 @@ void rt2800mmio_txstatus_tasklet(unsigne
  76  {
  77         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
  78
  79 -       do {
  80 -               rt2800mmio_txdone(rt2x00dev);
  81 +       rt2800_txdone(rt2x00dev, 16);
  82
  83 -       } while (rt2800mmio_fetch_txstatus(rt2x00dev));
  84 +       if (!kfifo_is_empty(&rt2x00dev->txstatus_fifo))
  85 +               tasklet_schedule(&rt2x00dev->txstatus_tasklet);
  86
  87 -       if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  88 -               rt2800mmio_enable_interrupt(rt2x00dev,
  89 -                                           INT_SOURCE_CSR_TX_FIFO_STATUS);
  90  }
  91  EXPORT_SYMBOL_GPL(rt2800mmio_txstatus_tasklet);
  92
  93 @@ -339,8 +322,10 @@ irqreturn_t rt2800mmio_interrupt(int irq
  94         mask = ~reg;
  95
  96         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) {
  97 +               rt2x00_set_field32(&mask, INT_MASK_CSR_TX_FIFO_STATUS, 1);
  98                 rt2800mmio_fetch_txstatus(rt2x00dev);
  99 -               tasklet_schedule(&rt2x00dev->txstatus_tasklet);
 100 +               if (!kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 101 +                       tasklet_schedule(&rt2x00dev->txstatus_tasklet);
 102         }
 103
 104         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_PRE_TBTT))
 105 @@ -500,7 +485,8 @@ void rt2800mmio_flush_queue(struct data_
 106                  */
 107                 if (tx_queue) {
 108                         tasklet_disable(&rt2x00dev->txstatus_tasklet);
 109 -                       rt2800mmio_txdone(rt2x00dev);
 110 +                       rt2800_txdone(rt2x00dev, UINT_MAX);
 111 +                       rt2800_txdone_nostatus(rt2x00dev);
 112                         tasklet_enable(&rt2x00dev->txstatus_tasklet);
 113                 }
 114
 115 --- a/drivers/net/wireless/ralink/rt2x00/rt2800usb.c
 116 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800usb.c
 117 @@ -480,7 +480,7 @@ static void rt2800usb_work_txdone(struct
 118         while (!kfifo_is_empty(&rt2x00dev->txstatus_fifo) ||
 119                rt2800_txstatus_timeout(rt2x00dev)) {
 120
 121 -               rt2800_txdone(rt2x00dev);
 122 +               rt2800_txdone(rt2x00dev, UINT_MAX);
 123
 124                 rt2800_txdone_nostatus(rt2x00dev);
 125