On 2015-08-10 at 11:53:41 +0200, yalin wang <yalin.wang2...@gmail.com> wrote:
> This change to use generic bitrev8() for bmac driver.
>
> Signed-off-by: yalin wang <yalin.wang2...@gmail.com>
> ---
> drivers/net/ethernet/apple/bmac.c | 17 +++--------------
> 1 file changed, 3 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/net/ethernet/apple/bmac.c
> b/drivers/net/ethernet/apple/bmac.c
> index a65d7a6..e749747 100644
> --- a/drivers/net/ethernet/apple/bmac.c
> +++ b/drivers/net/ethernet/apple/bmac.c
> @@ -22,6 +22,7 @@
> #include <linux/bitrev.h>
> #include <linux/ethtool.h>
> #include <linux/slab.h>
> +#include <linux/bitrev.h>
> #include <asm/prom.h>
> #include <asm/dbdma.h>
> #include <asm/io.h>
> @@ -805,18 +806,6 @@ static irqreturn_t bmac_txdma_intr(int irq, void *dev_id)
> }
>
> #ifndef SUNHME_MULTICAST
> -/* Real fast bit-reversal algorithm, 6-bit values */
> -static int reverse6[64] = {
> - 0x0,0x20,0x10,0x30,0x8,0x28,0x18,0x38,
> - 0x4,0x24,0x14,0x34,0xc,0x2c,0x1c,0x3c,
> - 0x2,0x22,0x12,0x32,0xa,0x2a,0x1a,0x3a,
> - 0x6,0x26,0x16,0x36,0xe,0x2e,0x1e,0x3e,
> - 0x1,0x21,0x11,0x31,0x9,0x29,0x19,0x39,
> - 0x5,0x25,0x15,0x35,0xd,0x2d,0x1d,0x3d,
> - 0x3,0x23,0x13,0x33,0xb,0x2b,0x1b,0x3b,
> - 0x7,0x27,0x17,0x37,0xf,0x2f,0x1f,0x3f
> -};
> -
> static unsigned int
> crc416(unsigned int curval, unsigned short nxtval)
> {
> @@ -871,7 +860,7 @@ bmac_addhash(struct bmac_data *bp, unsigned char *addr)
>
> if (!(*addr)) return;
> crc = bmac_crc((unsigned short *)addr) & 0x3f; /* Big-endian alert! */
> - crc = reverse6[crc]; /* Hyperfast bit-reversing algorithm */
> + crc = bitrev8((u8)crc);
No, this won't work. reverse6 works on 6 bit values, while bitrev8 works
on 8bit values, e.g. reverse6[1] = 0x20, while bitrev8(1) = 0x80
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