From: Ben Hutchings Date: Thu, 1 Sep 2011 12:09:59 +0000 (+0000) Subject: sfc: Use 64-bit writes for TX push where possible X-Git-Tag: firefly_0821_release~3680^2~4452^2~16 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=483f97f8b2b7f0ab09e14c06fe327d5e346fac28;p=firefly-linux-kernel-4.4.55.git sfc: Use 64-bit writes for TX push where possible This was originally done as part of commit 65f0b417dee94f779ce9b77102b7d73c93723b39 ("sfc: Use write-combining to reduce TX latency"), but that had to be reverted. Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller --- diff --git a/drivers/net/sfc/io.h b/drivers/net/sfc/io.h index dc45110b2456..751d1ec112cc 100644 --- a/drivers/net/sfc/io.h +++ b/drivers/net/sfc/io.h @@ -48,9 +48,9 @@ * replacing the low 96 bits with zero does not affect functionality. * - 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 - * written. If the collector does not hold values for the low 96 - * bits of the register, they will be written as zero. Writing to - * the last qword does not have this effect and must not be done. + * written. If the collector and the current write together do not + * provide values for all 128 bits of the register, the low 96 bits + * will be written as zero. * - 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, 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 _efx_writeq(efx, value->u64[0], reg + 0); + _efx_writeq(efx, value->u64[1], reg + 8); #else _efx_writed(efx, value->u32[0], reg + 0); _efx_writed(efx, value->u32[1], reg + 4); -#endif _efx_writed(efx, value->u32[2], reg + 8); _efx_writed(efx, value->u32[3], reg + 12); +#endif } #define efx_writeo_page(efx, value, reg, page) \ _efx_writeo_page(efx, value, \