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stmmac: review RX/TX ring management

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This patch is to rework the ring management now optimized.
The indexes into the ring buffer are always incremented, and
the entry is accessed via doing a modulo to find the "real"
position in the ring.
It is inefficient, modulo is an expensive operation.

The formula [(entry + 1) & (size - 1)] is now adopted on
a ring that is power-of-2 in size.
Then, the number of elements cannot be set by command line but
it is fixed.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe Cavallaro
2016-02-29 14:27:30 +01:00
committed by David S. Miller
parent 293e4365a1
commit e3ad57c967
5 changed files with 111 additions and 117 deletions
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4
drivers/net/ethernet/stmicro/stmmac/common.h
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@@ -42,6 +42,10 @@
#define DWMAC_CORE_3_40 0x34
#define DWMAC_CORE_3_50 0x35
#define DMA_TX_SIZE 512
#define DMA_RX_SIZE 512
#define STMMAC_GET_ENTRY(x, size) ((x + 1) & (size - 1))
#undef FRAME_FILTER_DEBUG
/* #define FRAME_FILTER_DEBUG */