target/linux/rb532/patches-2.6.28/008-korina_reset_resource_buffer_size_1536.patch

   1 The new value is the one used in the external patch before and allows at
   2 least a standard MTU of 1500 to be handled correctly. Impact of this
   3 change gets visible when bigger packets are to be received, issuing:
   4 | ping -s 492 <IP>
   5 and bigger payload sized led to 100% packet loss.
   6
   7 Signed-off-by: Phil Sutter <n0-1@freewrt.org>
   8 ---
   9  drivers/net/korina.c |    5 ++++-
  10  1 files changed, 4 insertions(+), 1 deletions(-)
  11
  12 diff --git a/drivers/net/korina.c b/drivers/net/korina.c
  13 index fefb33d..e30c2f4 100644
  14 --- a/drivers/net/korina.c
  15 +++ b/drivers/net/korina.c
  16 @@ -84,7 +84,10 @@
  17  #define KORINA_NUM_RDS 64  /* number of receive descriptors */
  18  #define KORINA_NUM_TDS 64  /* number of transmit descriptors */
  19
  20 -#define KORINA_RBSIZE  536 /* size of one resource buffer = Ether MTU */
  21 +/* KORINA_RBSIZE is the hardware's default maximum receive
  22 + * frame size in bytes. Having this hardcoded means that there
  23 + * is no support for MTU sizes greater than 1500. */
  24 +#define KORINA_RBSIZE  1536 /* size of one resource buffer = Ether MTU */
  25  #define KORINA_RDS_MASK        (KORINA_NUM_RDS - 1)
  26  #define KORINA_TDS_MASK        (KORINA_NUM_TDS - 1)
  27  #define RD_RING_SIZE   (KORINA_NUM_RDS * sizeof(struct dma_desc))
  28 --
  29 1.5.6.4
  30
  31