target/linux/rb532/patches/240-via_rhine_performance.patch

   1 Index: linux-2.6.23.17/drivers/net/via-rhine.c
   2 ===================================================================
   3 --- linux-2.6.23.17.orig/drivers/net/via-rhine.c
   4 +++ linux-2.6.23.17/drivers/net/via-rhine.c
   5 @@ -33,6 +33,8 @@
   6  #define DRV_VERSION    "1.4.3"
   7  #define DRV_RELDATE    "2007-03-06"
   8
   9 +#define PKT_ALIGN 1
  10 +
  11
  12  /* A few user-configurable values.
  13     These may be modified when a driver module is loaded. */
  14 @@ -40,6 +42,7 @@
  15  static int debug = 1;  /* 1 normal messages, 0 quiet .. 7 verbose. */
  16  static int max_interrupt_work = 20;
  17
  18 +#ifndef PKT_ALIGN
  19  /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
  20     Setting to > 1518 effectively disables this feature. */
  21  #if defined(__alpha__) || defined(__arm__) || defined(__hppa__) \
  22 @@ -49,6 +52,7 @@ static int rx_copybreak = 1518;
  23  #else
  24  static int rx_copybreak;
  25  #endif
  26 +#endif /* PKT_ALIGN */
  27
  28  /* Work-around for broken BIOSes: they are unable to get the chip back out of
  29     power state D3 so PXE booting fails. bootparam(7): via-rhine.avoid_D3=1 */
  30 @@ -111,6 +115,7 @@ static const int multicast_filter_limit
  31  #include <asm/io.h>
  32  #include <asm/irq.h>
  33  #include <asm/uaccess.h>
  34 +#include <asm/unaligned.h>
  35  #include <linux/dmi.h>
  36
  37  /* These identify the driver base version and may not be removed. */
  38 @@ -130,12 +135,14 @@ MODULE_LICENSE("GPL");
  39
  40  module_param(max_interrupt_work, int, 0);
  41  module_param(debug, int, 0);
  42 -module_param(rx_copybreak, int, 0);
  43  module_param(avoid_D3, bool, 0);
  44  MODULE_PARM_DESC(max_interrupt_work, "VIA Rhine maximum events handled per interrupt");
  45  MODULE_PARM_DESC(debug, "VIA Rhine debug level (0-7)");
  46 -MODULE_PARM_DESC(rx_copybreak, "VIA Rhine copy breakpoint for copy-only-tiny-frames");
  47  MODULE_PARM_DESC(avoid_D3, "Avoid power state D3 (work-around for broken BIOSes)");
  48 +#ifndef PKT_ALIGN
  49 +module_param(rx_copybreak, int, 0);
  50 +MODULE_PARM_DESC(rx_copybreak, "VIA Rhine copy breakpoint for copy-only-tiny-frames");
  51 +#endif
  52
  53  /*
  54                 Theory of Operation
  55 @@ -927,7 +934,7 @@ static void alloc_rbufs(struct net_devic
  56
  57         /* Fill in the Rx buffers.  Handle allocation failure gracefully. */
  58         for (i = 0; i < RX_RING_SIZE; i++) {
  59 -               struct sk_buff *skb = dev_alloc_skb(rp->rx_buf_sz);
  60 +               struct sk_buff *skb = dev_alloc_skb(rp->rx_buf_sz + 4);
  61                 rp->rx_skbuff[i] = skb;
  62                 if (skb == NULL)
  63                         break;
  64 @@ -1484,7 +1491,9 @@ static int rhine_rx(struct net_device *d
  65                         struct sk_buff *skb;
  66                         /* Length should omit the CRC */
  67                         int pkt_len = data_size - 4;
  68 -
  69 +#ifdef PKT_ALIGN
  70 +                       int i;
  71 +#else
  72                         /* Check if the packet is long enough to accept without
  73                            copying to a minimally-sized skbuff. */
  74                         if (pkt_len < rx_copybreak &&
  75 @@ -1503,7 +1512,9 @@ static int rhine_rx(struct net_device *d
  76                                                                rp->rx_skbuff_dma[entry],
  77                                                                rp->rx_buf_sz,
  78                                                                PCI_DMA_FROMDEVICE);
  79 -                       } else {
  80 +                       } else
  81 +#endif
  82 +                       {
  83                                 skb = rp->rx_skbuff[entry];
  84                                 if (skb == NULL) {
  85                                         printk(KERN_ERR "%s: Inconsistent Rx "
  86 @@ -1517,6 +1528,14 @@ static int rhine_rx(struct net_device *d
  87                                                  rp->rx_skbuff_dma[entry],
  88                                                  rp->rx_buf_sz,
  89                                                  PCI_DMA_FROMDEVICE);
  90 +#ifdef PKT_ALIGN
  91 +                               /* align the data to the ip header - should be faster than copying the entire packet */
  92 +                               for (i = pkt_len - (pkt_len % 4); i >= 0; i -= 4) {
  93 +                                       put_unaligned(*((u32 *) (skb->data + i)), (u32 *) (skb->data + i + 2));
  94 +                               }
  95 +                               skb->data += 2;
  96 +                               skb->tail += 2;
  97 +#endif
  98                         }
  99                         skb->protocol = eth_type_trans(skb, dev);
 100  #ifdef CONFIG_VIA_RHINE_NAPI