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Date: Wed, 9 Dec 2020 02:22:18 +0100 From: Andrew Lunn <andrew@...n.ch> To: Florian Fainelli <f.fainelli@...il.com> Cc: Sven Van Asbroeck <thesven73@...il.com>, Jakub Kicinski <kuba@...nel.org>, Bryan Whitehead <bryan.whitehead@...rochip.com>, Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>, David S Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH net v1 2/2] lan743x: boost performance: limit PCIe bandwidth requirement > dma_sync_single_for_{cpu,device} is what you would need in order to make > a partial cache line invalidation. You would still need to unmap the > same address+length pair that was used for the initial mapping otherwise > the DMA-API debugging will rightfully complain. But often you don't unmap it, you call dma_sync_single_for_device and put it back into the ring. Andrew
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