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Commit fd83f122 authored by Jes Sorensen's avatar Jes Sorensen Committed by Kalle Valo
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rtl8xxxu: gen1: Add module parameters to adjust DMA aggregation parameters 



This allows the user to specify DMA aggregation timout and block
count. Blocks are presumably always 512 bytes, so the minimum block
count is 6 for 802.11 packets.

Signed-off-by: default avatarJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent 614e389f

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c

+28 −0
Original line number Diff line number Diff line
@@ -45,6 +45,8 @@ 
int rtl8xxxu_debug = RTL8XXXU_DEBUG_EFUSE;

static bool rtl8xxxu_ht40_2g;

static bool rtl8xxxu_dma_aggregation;

static int rtl8xxxu_dma_agg_timeout = -1;

static int rtl8xxxu_dma_agg_pages = -1;



MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@redhat.com>");

MODULE_DESCRIPTION("RTL8XXXu USB mac80211 Wireless LAN Driver");
@@ -65,6 +67,10 @@ module_param_named(ht40_2g, rtl8xxxu_ht40_2g, bool, 0600); 
MODULE_PARM_DESC(ht40_2g, "Enable HT40 support on the 2.4GHz band");

module_param_named(dma_aggregation, rtl8xxxu_dma_aggregation, bool, 0600);

MODULE_PARM_DESC(dma_aggregation, "Enable DMA packet aggregation");

module_param_named(dma_agg_timeout, rtl8xxxu_dma_agg_timeout, int, 0600);

MODULE_PARM_DESC(dma_agg_timeout, "Set DMA aggregation timeout (range 1-127)");

module_param_named(dma_agg_pages, rtl8xxxu_dma_agg_pages, int, 0600);

MODULE_PARM_DESC(dma_agg_pages, "Set DMA aggregation pages (range 1-127, 0 to disable)");



#define USB_VENDOR_ID_REALTEK		0x0bda

#define RTL8XXXU_RX_URBS		32
@@ -4441,6 +4447,18 @@ void rtl8xxxu_gen1_init_aggregation(struct rtl8xxxu_priv *priv) 
	 */



	page_thresh = (priv->fops->rx_agg_buf_size / 512);

	if (rtl8xxxu_dma_agg_pages >= 0) {

		if (rtl8xxxu_dma_agg_pages <= page_thresh)

			timeout = page_thresh;

		else if (rtl8xxxu_dma_agg_pages <= 6)

			dev_err(&priv->udev->dev,

				"%s: dma_agg_pages=%i too small, minium is 6\n",

				__func__, rtl8xxxu_dma_agg_pages);

		else

			dev_err(&priv->udev->dev,

				"%s: dma_agg_pages=%i larger than limit %i\n",

				__func__, rtl8xxxu_dma_agg_pages, page_thresh);

	}

	rtl8xxxu_write8(priv, REG_RXDMA_AGG_PG_TH, page_thresh);

	/*

	 * REG_RXDMA_AGG_PG_TH + 1 seems to be the timeout register on
@@ -4448,6 +4466,16 @@ void rtl8xxxu_gen1_init_aggregation(struct rtl8xxxu_priv *priv) 
	 * don't set it, so better set both.

	 */

	timeout = 4;



	if (rtl8xxxu_dma_agg_timeout >= 0) {

		if (rtl8xxxu_dma_agg_timeout <= 127)

			timeout = rtl8xxxu_dma_agg_timeout;

		else

			dev_err(&priv->udev->dev,

				"%s: Invalid dma_agg_timeout: %i\n",

				__func__, rtl8xxxu_dma_agg_timeout);

	}



	rtl8xxxu_write8(priv, REG_RXDMA_AGG_PG_TH + 1, timeout);

	rtl8xxxu_write8(priv, REG_USB_DMA_AGG_TO, timeout);

	priv->rx_buf_aggregation = 1;