Re: [RFT] rtl8187: use DMA-aware buffers with usb_control_msg

John W. Linville
2009-05-09T16:01:28Z

On Sat, May 09, 2009 at 06:57:31AM -0700, Greg KH wrote:
> On Sat, May 09, 2009 at 11:38:32AM +0200, Eric Valette wrote:
> > The patch fix the DMA warning and the driver seems to work (just
> > associated it) but I must say that the allocation failure handling path
> > and the fact that we use now kmalloc for allocating a few bytes in such
> > a routine makes me worry about possible negative performance impact
> > unless theses routines are used only in a slow configuration path (did
> > no took time to red the code due to many other problems).
>
> usb_control messages are slow and should not be on the "fast path" of
> any data being sent through the device. Any overhead of the
> kmalloc/kfree is totally eaten up by the actual transmission turn around
> time of the message itself, so you don't have to worry about the
> performance impact.

Yeah, I don't like the original version either. Even if the kmalloc's
aren't a big performance hit, the failure path sucks. I've included a
new version below, but unfortunately I haven't had a chance to test it.
Please give it a try if you get a chance?

> thanks for testing.

Ditto!

---

>From 73f58f111f3ec5009c603bb4abf86e5ef4c5503f Mon Sep 17 00:00:00 2001
From: John W. Linville <linville@tuxdriver.com>
Date: Wed, 6 May 2009 13:57:27 -0400
Subject: [PATCH] rtl8187: use DMA-aware buffers with usb_control_msg

Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
drivers/net/wireless/rtl818x/rtl8187.h | 57 ++++++++++++++++++------
drivers/net/wireless/rtl818x/rtl8187_dev.c | 8 +++
drivers/net/wireless/rtl818x/rtl8187_rtl8225.c | 8 +++-
3 files changed, 58 insertions(+), 15 deletions(-)

diff --git a/drivers/net/wireless/rtl818x/rtl8187.h b/drivers/net/wireless/rtl818x/rtl8187.h
index 622196d..c09bfef 100644
--- a/drivers/net/wireless/rtl818x/rtl8187.h
+++ b/drivers/net/wireless/rtl818x/rtl8187.h
@@ -127,6 +127,12 @@ struct rtl8187_priv {
__le64 buf;
struct sk_buff_head queue;
} b_tx_status; /* This queue is used by both -b and non-b devices */
+ struct mutex io_mutex;
+ union {
+ u8 bits8;
+ __le16 bits16;
+ __le32 bits32;
+ } *io_dmabuf;
};

void rtl8187_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data);
@@ -136,10 +142,14 @@ static inline u8 rtl818x_ioread8_idx(struct rtl8187_priv *priv,
{
u8 val;

+ mutex_lock(&priv->io_mutex);
usb_control_msg(priv->udev, usb_rcvctrlpipe(priv->udev, 0),
RTL8187_REQ_GET_REG, RTL8187_REQT_READ,
- (unsigned long)addr, idx & 0x03, &val,
- sizeof(val), HZ / 2);
+ (unsigned long)addr, idx & 0x03,
+ &priv->io_dmabuf->bits8, sizeof(val), HZ / 2);
+
+ val = priv->io_dmabuf->bits8;
+ mutex_unlock(&priv->io_mutex);

return val;
}
@@ -154,10 +164,14 @@ static inline u16 rtl818x_ioread16_idx(struct rtl8187_priv *priv,
{
__le16 val;

+ mutex_lock(&priv->io_mutex);
usb_control_msg(priv->udev, usb_rcvctrlpipe(priv->udev, 0),
RTL8187_REQ_GET_REG, RTL8187_REQT_READ,
- (unsigned long)addr, idx & 0x03, &val,
- sizeof(val), HZ / 2);
+ (unsigned long)addr, idx & 0x03,
+ &priv->io_dmabuf->bits16, sizeof(val), HZ / 2);
+
+ val = priv->io_dmabuf->bits16;
+ mutex_unlock(&priv->io_mutex);

return le16_to_cpu(val);
}
@@ -172,10 +186,14 @@ static inline u32 rtl818x_ioread32_idx(struct rtl8187_priv *priv,
{
__le32 val;

+ mutex_lock(&priv->io_mutex);
usb_control_msg(priv->udev, usb_rcvctrlpipe(priv->udev, 0),
RTL8187_REQ_GET_REG, RTL8187_REQT_READ,
- (unsigned long)addr, idx & 0x03, &val,
- sizeof(val), HZ / 2);
+ (unsigned long)addr, idx & 0x03,
+ &priv->io_dmabuf->bits32, sizeof(val), HZ / 2);
+
+ val = priv->io_dmabuf->bits32;
+ mutex_unlock(&priv->io_mutex);

return le32_to_cpu(val);
}
@@ -188,10 +206,15 @@ static inline u32 rtl818x_ioread32(struct rtl8187_priv *priv, __le32 *addr)
static inline void rtl818x_iowrite8_idx(struct rtl8187_priv *priv,
u8 *addr, u8 val, u8 idx)
{
+ mutex_lock(&priv->io_mutex);
+
+ priv->io_dmabuf->bits8 = val;
usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
- (unsigned long)addr, idx & 0x03, &val,
- sizeof(val), HZ / 2);
+ (unsigned long)addr, idx & 0x03,
+ &priv->io_dmabuf->bits8, sizeof(val), HZ / 2);
+
+ mutex_unlock(&priv->io_mutex);
}

static inline void rtl818x_iowrite8(struct rtl8187_priv *priv, u8 *addr, u8 val)
@@ -202,12 +225,15 @@ static inline void rtl818x_iowrite8(struct rtl8187_priv *priv, u8 *addr, u8 val)
static inline void rtl818x_iowrite16_idx(struct rtl8187_priv *priv,
__le16 *addr, u16 val, u8 idx)
{
- __le16 buf = cpu_to_le16(val);
+ mutex_lock(&priv->io_mutex);

+ priv->io_dmabuf->bits16 = cpu_to_le16(val);
usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
- (unsigned long)addr, idx & 0x03, &buf, sizeof(buf),
- HZ / 2);
+ (unsigned long)addr, idx & 0x03,
+ &priv->io_dmabuf->bits16, sizeof(val), HZ / 2);
+
+ mutex_unlock(&priv->io_mutex);
}

static inline void rtl818x_iowrite16(struct rtl8187_priv *priv, __le16 *addr,
@@ -219,12 +245,15 @@ static inline void rtl818x_iowrite16(struct rtl8187_priv *priv, __le16 *addr,
static inline void rtl818x_iowrite32_idx(struct rtl8187_priv *priv,
__le32 *addr, u32 val, u8 idx)
{
- __le32 buf = cpu_to_le32(val);
+ mutex_lock(&priv->io_mutex);

+ priv->io_dmabuf->bits32 = cpu_to_le32(val);
usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
- (unsigned long)addr, idx & 0x03, &buf, sizeof(buf),
- HZ / 2);
+ (unsigned long)addr, idx & 0x03,
+ &priv->io_dmabuf->bits32, sizeof(val), HZ / 2);
+
+ mutex_unlock(&priv->io_mutex);
}

static inline void rtl818x_iowrite32(struct rtl8187_priv *priv, __le32 *addr,
diff --git a/drivers/net/wireless/rtl818x/rtl8187_dev.c b/drivers/net/wireless/rtl818x/rtl8187_dev.c
index 158827e..a492abd 100644
--- a/drivers/net/wireless/rtl818x/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8187_dev.c
@@ -1326,6 +1326,14 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
priv = dev->priv;
priv->is_rtl8187b = (id->driver_info == DEVICE_RTL8187B);

+ /* allocate "DMA aware" buffer for register accesses */
+ priv->io_dmabuf = kmalloc(sizeof(*priv->io_dmabuf), GFP_KERNEL);
+ if (!priv->io_dmabuf) {
+ err = -ENOMEM;
+ goto err_free_dev;
+ }
+ mutex_init(&priv->io_mutex);
+
SET_IEEE80211_DEV(dev, &intf->dev);
usb_set_intfdata(intf, dev);
priv->udev = udev;
diff --git a/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c b/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c
index 78df281..a098193 100644
--- a/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c
+++ b/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c
@@ -88,9 +88,15 @@ static void rtl8225_write_8051(struct ieee80211_hw *dev, u8 addr, __le16 data)
rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, reg80);
udelay(10);

+ mutex_lock(&priv->io_mutex);
+
+ priv->io_dmabuf->bits16 = data;
usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
- addr, 0x8225, &data, sizeof(data), HZ / 2);
+ addr, 0x8225, &priv->io_dmabuf->bits16, sizeof(data),
+ HZ / 2);
+
+ mutex_unlock(&priv->io_mutex);

rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, reg80 | (1 << 2));
udelay(10);
--
1.6.0.6

--
John W. Linville Someday the world will need a hero, and you
linville@tuxdriver.com might be all we have. Be ready.