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stmmac: fix and better tune the default buffer sizes 

This patch is to fix and tune the default buffer sizes.
It reduces the default bufsize used by the driver from
4KiB to 1536 bytes.

Patch has been tested on both ARM and SH4 platform based.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe CAVALLARO 2014-03-10 13:40:32 +01:00 committed by David S. Miller
parent 83bf79b6bb
commit d916701c67
1 changed files with 6 additions and 6 deletions
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12
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -92,8 +92,8 @@ static int tc = TC_DEFAULT;
module_param(tc, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(tc, "DMA threshold control value");
#define DMA_BUFFER_SIZE BUF_SIZE_4KiB
static int buf_sz = DMA_BUFFER_SIZE;
#define DEFAULT_BUFSIZE 1536
static int buf_sz = DEFAULT_BUFSIZE;
module_param(buf_sz, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(buf_sz, "DMA buffer size");
@ -136,8 +136,8 @@ static void stmmac_verify_args(void)
dma_rxsize = DMA_RX_SIZE;
if (unlikely(dma_txsize < 0))
dma_txsize = DMA_TX_SIZE;
if (unlikely((buf_sz < DMA_BUFFER_SIZE) || (buf_sz > BUF_SIZE_16KiB)))
buf_sz = DMA_BUFFER_SIZE;
if (unlikely((buf_sz < DEFAULT_BUFSIZE) || (buf_sz > BUF_SIZE_16KiB)))
buf_sz = DEFAULT_BUFSIZE;
if (unlikely(flow_ctrl > 1))
flow_ctrl = FLOW_AUTO;
else if (likely(flow_ctrl < 0))
@ -901,10 +901,10 @@ static int stmmac_set_bfsize(int mtu, int bufsize)
ret = BUF_SIZE_8KiB;
else if (mtu >= BUF_SIZE_2KiB)
ret = BUF_SIZE_4KiB;
else if (mtu >= DMA_BUFFER_SIZE)
else if (mtu > DEFAULT_BUFSIZE)
ret = BUF_SIZE_2KiB;
else
ret = DMA_BUFFER_SIZE;
ret = DEFAULT_BUFSIZE;
return ret;
}