package/kernel/mac80211/patches/650-0017-rtl8xxxu-gen1-Add-module-parameters-to-adjust-DMA-ag.patch

   1 From 3dc0c72274876ad9612b12ab9fce553ec7e21d20 Mon Sep 17 00:00:00 2001
   2 From: Jes Sorensen <Jes.Sorensen@redhat.com>
   3 Date: Wed, 22 Jun 2016 23:17:37 -0400
   4 Subject: [PATCH] rtl8xxxu: gen1: Add module parameters to adjust DMA
   5  aggregation parameters
   6
   7 This allows the user to specify DMA aggregation timout and block
   8 count. Blocks are presumably always 512 bytes, so the minimum block
   9 count is 6 for 802.11 packets.
  10
  11 Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
  12 ---
  13  .../net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c  | 28 ++++++++++++++++++++++
  14  1 file changed, 28 insertions(+)
  15
  16 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  17 +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  18 @@ -45,6 +45,8 @@
  19  int rtl8xxxu_debug = RTL8XXXU_DEBUG_EFUSE;
  20  static bool rtl8xxxu_ht40_2g;
  21  static bool rtl8xxxu_dma_aggregation;
  22 +static int rtl8xxxu_dma_agg_timeout = -1;
  23 +static int rtl8xxxu_dma_agg_pages = -1;
  24
  25  MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@redhat.com>");
  26  MODULE_DESCRIPTION("RTL8XXXu USB mac80211 Wireless LAN Driver");
  27 @@ -65,6 +67,10 @@ module_param_named(ht40_2g, rtl8xxxu_ht4
  28  MODULE_PARM_DESC(ht40_2g, "Enable HT40 support on the 2.4GHz band");
  29  module_param_named(dma_aggregation, rtl8xxxu_dma_aggregation, bool, 0600);
  30  MODULE_PARM_DESC(dma_aggregation, "Enable DMA packet aggregation");
  31 +module_param_named(dma_agg_timeout, rtl8xxxu_dma_agg_timeout, int, 0600);
  32 +MODULE_PARM_DESC(dma_agg_timeout, "Set DMA aggregation timeout (range 1-127)");
  33 +module_param_named(dma_agg_pages, rtl8xxxu_dma_agg_pages, int, 0600);
  34 +MODULE_PARM_DESC(dma_agg_pages, "Set DMA aggregation pages (range 1-127, 0 to disable)");
  35
  36  #define USB_VENDOR_ID_REALTEK          0x0bda
  37  #define RTL8XXXU_RX_URBS               32
  38 @@ -4441,6 +4447,18 @@ void rtl8xxxu_gen1_init_aggregation(stru
  39          */
  40
  41         page_thresh = (priv->fops->rx_agg_buf_size / 512);
  42 +       if (rtl8xxxu_dma_agg_pages >= 0) {
  43 +               if (rtl8xxxu_dma_agg_pages <= page_thresh)
  44 +                       timeout = page_thresh;
  45 +               else if (rtl8xxxu_dma_agg_pages <= 6)
  46 +                       dev_err(&priv->udev->dev,
  47 +                               "%s: dma_agg_pages=%i too small, minium is 6\n",
  48 +                               __func__, rtl8xxxu_dma_agg_pages);
  49 +               else
  50 +                       dev_err(&priv->udev->dev,
  51 +                               "%s: dma_agg_pages=%i larger than limit %i\n",
  52 +                               __func__, rtl8xxxu_dma_agg_pages, page_thresh);
  53 +       }
  54         rtl8xxxu_write8(priv, REG_RXDMA_AGG_PG_TH, page_thresh);
  55         /*
  56          * REG_RXDMA_AGG_PG_TH + 1 seems to be the timeout register on
  57 @@ -4448,6 +4466,16 @@ void rtl8xxxu_gen1_init_aggregation(stru
  58          * don't set it, so better set both.
  59          */
  60         timeout = 4;
  61 +
  62 +       if (rtl8xxxu_dma_agg_timeout >= 0) {
  63 +               if (rtl8xxxu_dma_agg_timeout <= 127)
  64 +                       timeout = rtl8xxxu_dma_agg_timeout;
  65 +               else
  66 +                       dev_err(&priv->udev->dev,
  67 +                               "%s: Invalid dma_agg_timeout: %i\n",
  68 +                               __func__, rtl8xxxu_dma_agg_timeout);
  69 +       }
  70 +
  71         rtl8xxxu_write8(priv, REG_RXDMA_AGG_PG_TH + 1, timeout);
  72         rtl8xxxu_write8(priv, REG_USB_DMA_AGG_TO, timeout);
  73         priv->rx_buf_aggregation = 1;