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sfc: Use 64-bit writes for TX push where possible

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This was originally done as part of commit
65f0b417de ("sfc: Use write-combining to
reduce TX latency"), but that had to be reverted.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2011-09-01 12:09:59 +00:00 committed by David S. Miller
parent 86c432ca5d
commit 483f97f8b2
1 changed files with 5 additions and 4 deletions
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9
drivers/net/sfc/io.h
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@ -48,9 +48,9 @@
* replacing the low 96 bits with zero does not affect functionality. * replacing the low 96 bits with zero does not affect functionality.
* - If the host writes to the last dword address of such a register * - If the host writes to the last dword address of such a register
* (i.e. the high 32 bits) the underlying register will always be * (i.e. the high 32 bits) the underlying register will always be
* written. If the collector does not hold values for the low 96 * written. If the collector and the current write together do not
* bits of the register, they will be written as zero. Writing to * provide values for all 128 bits of the register, the low 96 bits
* the last qword does not have this effect and must not be done. * will be written as zero.
* - If the host writes to the address of any other part of such a * - If the host writes to the address of any other part of such a
* register while the collector already holds values for some other * register while the collector already holds values for some other
* register, the write is discarded and the collector maintains its * register, the write is discarded and the collector maintains its
@ -237,12 +237,13 @@ static inline void _efx_writeo_page(struct efx_nic *efx, efx_oword_t *value,
#ifdef EFX_USE_QWORD_IO #ifdef EFX_USE_QWORD_IO
_efx_writeq(efx, value->u64[0], reg + 0); _efx_writeq(efx, value->u64[0], reg + 0);
_efx_writeq(efx, value->u64[1], reg + 8);
#else #else
_efx_writed(efx, value->u32[0], reg + 0); _efx_writed(efx, value->u32[0], reg + 0);
_efx_writed(efx, value->u32[1], reg + 4); _efx_writed(efx, value->u32[1], reg + 4);
#endif
_efx_writed(efx, value->u32[2], reg + 8); _efx_writed(efx, value->u32[2], reg + 8);
_efx_writed(efx, value->u32[3], reg + 12); _efx_writed(efx, value->u32[3], reg + 12);
#endif
} }
#define efx_writeo_page(efx, value, reg, page) \ #define efx_writeo_page(efx, value, reg, page) \
_efx_writeo_page(efx, value, \ _efx_writeo_page(efx, value, \