Re: [PATCH net-next v2 1/2] net: mvneta: avoid getting status from rx_desc as much as possible

Hi Jisheng, On ven., févr. 17 2017, Jisheng Zhang wrote: > In hot code path mvneta_rx_hwbm(), the rx_desc->status is read twice. > The rx_desc is allocated by dma_alloc_coherent, it's uncacheable if > the device isn't cache-coherent, reading from uncached memory is > fairly slow. So reuse the

[PATCH net-next v2 1/2] net: mvneta: avoid getting status from rx_desc as much as possible

In hot code path mvneta_rx_hwbm(), the rx_desc->status is read twice. The rx_desc is allocated by dma_alloc_coherent, it's uncacheable if the device isn't cache-coherent, reading from uncached memory is fairly slow. So reuse the read out rx_status to avoid the second reading from uncached memory.