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Date: Sat, 18 May 2013 23:21:18 +0300 (EEST)
From: Petko Manolov <petkan@...leusys.com>
To: David Miller <davem@...emloft.net>
cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] drivers: net: usb: rtl8150: getting rid of skb pool
From: Petko Manolov <petkan@...leusys.com>
removing socket buffer pre-allocation pool;
Signed-off-by: Petko Manolov <petkan@...leusys.com>
---
drivers/net/usb/rtl8150.c | 60 +++--------------------------------
drivers/net/usb/rtl8150.h | 3 --
2 files changed, 5 insertions(+), 58 deletions(-)
diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
index 7d1897b..fd4bc2a 100644
--- a/drivers/net/usb/rtl8150.c
+++ b/drivers/net/usb/rtl8150.c
@@ -240,21 +240,6 @@ static void unlink_all_urbs(rtl8150_t * dev)
usb_kill_urb(dev->ctrl_urb);
}
-static inline struct sk_buff *pull_skb(rtl8150_t *dev)
-{
- struct sk_buff *skb;
- int i;
-
- for (i = 0; i < RX_SKB_POOL_SIZE; i++) {
- if (dev->rx_skb_pool[i]) {
- skb = dev->rx_skb_pool[i];
- dev->rx_skb_pool[i] = NULL;
- return skb;
- }
- }
- return NULL;
-}
-
static void read_bulk_callback(struct urb *urb)
{
rtl8150_t *dev;
@@ -305,9 +290,7 @@ static void read_bulk_callback(struct urb *urb)
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += pkt_len;
- spin_lock(&dev->rx_pool_lock);
- skb = pull_skb(dev);
- spin_unlock(&dev->rx_pool_lock);
+ skb = __netdev_alloc_skb_ip_align(dev->netdev, RTL8150_MTU, GFP_ATOMIC);
if (!skb)
goto resched;
@@ -441,47 +424,16 @@ static int rtl8150_resume(struct usb_interface *intf)
**
*/
-static void fill_skb_pool(rtl8150_t *dev)
-{
- struct sk_buff *skb;
- int i;
-
- for (i = 0; i < RX_SKB_POOL_SIZE; i++) {
- if (dev->rx_skb_pool[i])
- continue;
- skb = dev_alloc_skb(RTL8150_MTU + 2);
- if (!skb) {
- return;
- }
- skb_reserve(skb, 2);
- dev->rx_skb_pool[i] = skb;
- }
-}
-
-static void free_skb_pool(rtl8150_t *dev)
-{
- int i;
-
- for (i = 0; i < RX_SKB_POOL_SIZE; i++)
- if (dev->rx_skb_pool[i])
- dev_kfree_skb(dev->rx_skb_pool[i]);
-}
-
static void rx_fixup(unsigned long data)
{
struct rtl8150 *dev = (struct rtl8150 *)data;
struct sk_buff *skb;
int status;
- spin_lock_irq(&dev->rx_pool_lock);
- fill_skb_pool(dev);
- spin_unlock_irq(&dev->rx_pool_lock);
if (test_bit(RX_URB_FAIL, &dev->flags))
if (dev->rx_skb)
goto try_again;
- spin_lock_irq(&dev->rx_pool_lock);
- skb = pull_skb(dev);
- spin_unlock_irq(&dev->rx_pool_lock);
+ skb = __netdev_alloc_skb_ip_align(dev->netdev, RTL8150_MTU, GFP_ATOMIC);
if (skb == NULL)
goto tlsched;
dev->rx_skb = skb;
@@ -611,7 +563,9 @@ static int rtl8150_open(struct net_device *netdev)
int res;
if (dev->rx_skb == NULL)
- dev->rx_skb = pull_skb(dev);
+ dev->rx_skb = __netdev_alloc_skb_ip_align(dev->netdev,
+ RTL8150_MTU,
+ GFP_ATOMIC);
if (!dev->rx_skb)
return -ENOMEM;
@@ -764,7 +718,6 @@ static int rtl8150_probe(struct usb_interface *intf,
}
tasklet_init(&dev->tl, rx_fixup, (unsigned long)dev);
- spin_lock_init(&dev->rx_pool_lock);
dev->udev = udev;
dev->netdev = netdev;
@@ -781,7 +734,6 @@ static int rtl8150_probe(struct usb_interface *intf,
dev_err(&intf->dev, "couldn't reset the device\n");
goto out1;
}
- fill_skb_pool(dev);
set_ethernet_addr(dev);
usb_set_intfdata(intf, dev);
@@ -797,7 +749,6 @@ static int rtl8150_probe(struct usb_interface *intf,
out2:
usb_set_intfdata(intf, NULL);
- free_skb_pool(dev);
out1:
free_all_urbs(dev);
out:
@@ -817,7 +768,6 @@ static void rtl8150_disconnect(struct usb_interface *intf)
unregister_netdev(dev->netdev);
unlink_all_urbs(dev);
free_all_urbs(dev);
- free_skb_pool(dev);
if (dev->rx_skb)
dev_kfree_skb(dev->rx_skb);
kfree(dev->intr_buff);
diff --git a/drivers/net/usb/rtl8150.h b/drivers/net/usb/rtl8150.h
index cfb1e74..a29410c 100644
--- a/drivers/net/usb/rtl8150.h
+++ b/drivers/net/usb/rtl8150.h
@@ -75,7 +75,6 @@
#define RTL8150_MTU 1540
#define RTL8150_TX_TIMEOUT (HZ)
-#define RX_SKB_POOL_SIZE 4
/* rtl8150 flags */
#define RTL8150_HW_CRC 0
@@ -117,8 +116,6 @@ struct rtl8150 {
struct net_device *netdev;
struct urb *rx_urb, *tx_urb, *intr_urb, *ctrl_urb;
struct sk_buff *tx_skb, *rx_skb;
- struct sk_buff *rx_skb_pool[RX_SKB_POOL_SIZE];
- spinlock_t rx_pool_lock;
struct usb_ctrlrequest dr;
int intr_interval;
__le16 rx_creg;
--
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