package/kernel/mac80211/patches/652-0012-rtl8xxxu-gen1-Add-module-parameters-to-adjust-DMA-ag.patch

   1 From fd83f12278262feccd012b62c30643bd6a6c2888 Mon Sep 17 00:00:00 2001
   2 From: Jes Sorensen <Jes.Sorensen@redhat.com>
   3 Date: Mon, 27 Jun 2016 12:32:10 -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 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  13 ---
  14  .../net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c  | 28 ++++++++++++++++++++++
  15  1 file changed, 28 insertions(+)
  16
  17 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  18 +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  19 @@ -45,6 +45,8 @@
  20  int rtl8xxxu_debug = RTL8XXXU_DEBUG_EFUSE;
  21  static bool rtl8xxxu_ht40_2g;
  22  static bool rtl8xxxu_dma_aggregation;
  23 +static int rtl8xxxu_dma_agg_timeout = -1;
  24 +static int rtl8xxxu_dma_agg_pages = -1;
  25
  26  MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@redhat.com>");
  27  MODULE_DESCRIPTION("RTL8XXXu USB mac80211 Wireless LAN Driver");
  28 @@ -65,6 +67,10 @@ module_param_named(ht40_2g, rtl8xxxu_ht4
  29  MODULE_PARM_DESC(ht40_2g, "Enable HT40 support on the 2.4GHz band");
  30  module_param_named(dma_aggregation, rtl8xxxu_dma_aggregation, bool, 0600);
  31  MODULE_PARM_DESC(dma_aggregation, "Enable DMA packet aggregation");
  32 +module_param_named(dma_agg_timeout, rtl8xxxu_dma_agg_timeout, int, 0600);
  33 +MODULE_PARM_DESC(dma_agg_timeout, "Set DMA aggregation timeout (range 1-127)");
  34 +module_param_named(dma_agg_pages, rtl8xxxu_dma_agg_pages, int, 0600);
  35 +MODULE_PARM_DESC(dma_agg_pages, "Set DMA aggregation pages (range 1-127, 0 to disable)");
  36
  37  #define USB_VENDOR_ID_REALTEK          0x0bda
  38  #define RTL8XXXU_RX_URBS               32
  39 @@ -4441,6 +4447,18 @@ void rtl8xxxu_gen1_init_aggregation(stru
  40          */
  41
  42         page_thresh = (priv->fops->rx_agg_buf_size / 512);
  43 +       if (rtl8xxxu_dma_agg_pages >= 0) {
  44 +               if (rtl8xxxu_dma_agg_pages <= page_thresh)
  45 +                       timeout = page_thresh;
  46 +               else if (rtl8xxxu_dma_agg_pages <= 6)
  47 +                       dev_err(&priv->udev->dev,
  48 +                               "%s: dma_agg_pages=%i too small, minium is 6\n",
  49 +                               __func__, rtl8xxxu_dma_agg_pages);
  50 +               else
  51 +                       dev_err(&priv->udev->dev,
  52 +                               "%s: dma_agg_pages=%i larger than limit %i\n",
  53 +                               __func__, rtl8xxxu_dma_agg_pages, page_thresh);
  54 +       }
  55         rtl8xxxu_write8(priv, REG_RXDMA_AGG_PG_TH, page_thresh);
  56         /*
  57          * REG_RXDMA_AGG_PG_TH + 1 seems to be the timeout register on
  58 @@ -4448,6 +4466,16 @@ void rtl8xxxu_gen1_init_aggregation(stru
  59          * don't set it, so better set both.
  60          */
  61         timeout = 4;
  62 +
  63 +       if (rtl8xxxu_dma_agg_timeout >= 0) {
  64 +               if (rtl8xxxu_dma_agg_timeout <= 127)
  65 +                       timeout = rtl8xxxu_dma_agg_timeout;
  66 +               else
  67 +                       dev_err(&priv->udev->dev,
  68 +                               "%s: Invalid dma_agg_timeout: %i\n",
  69 +                               __func__, rtl8xxxu_dma_agg_timeout);
  70 +       }
  71 +
  72         rtl8xxxu_write8(priv, REG_RXDMA_AGG_PG_TH + 1, timeout);
  73         rtl8xxxu_write8(priv, REG_USB_DMA_AGG_TO, timeout);
  74         priv->rx_buf_aggregation = 1;