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b=ckG+UfN4+OwTmM/84OL+PNQ37QbyXpZidAQHHwRsYFhlUGhl2s1ivmwBmzvmUn1Vl sSS0D1edSUniADu4+eUxex8BbVRFdpJ44uzvDenuLNBqQyLVvn6IPJ5TxfW9JQezgD V37hYaMCzs2B01mL3SOT1JYSdbp4vqka7NFyHrgm0LoQurCeQ0fO4XIGiotWN0U+xr QHgOuZqdSTxPl/oTeUzePcsNfoKh4vSHY52iMPXIUHD9TF63dMNyjINh3gKHn3vJkP bzTn//PombRQC2JXt+q6XMqBq/1QdqlCdNAYPU9MGsS1/j+ihKMXKhusryZz2Gu5UQ vAhsAvFWMbhFA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200914_103828_478466_75B65168 X-CRM114-Status: GOOD ( 16.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lorenzo Pieralisi , catalin.marinas@arm.com, Leon Romanovsky , Benjamin Herrenschmidt , Bjorn Helgaas , linux-pci@vger.kernel.org, will@kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 14, 2020 at 02:24:06PM +0000, Clint Sbisa wrote: > On Mon, Sep 14, 2020 at 11:17:26AM -0300, Jason Gunthorpe wrote: > > On Fri, Sep 11, 2020 at 09:42:25PM +0000, Clint Sbisa wrote: > > > > > There's no DMA involved with this BAR-- the driver writes a portion of the > > > packet contents in addition to the descriptors, which generally increases the > > > number of TLPs if write-combine isn't used. Furthermore, this BAR is only used > > > for writes and never for reads. > > > > You use DPDK without DMA? How does receive work? > > That was not worded well. DMA is used, but the first X bytes of the packet are > written directly to this BAR instead of being DMA'd-- the rest of the data is > DMA'd. which is back to my original question, how do you do DMA using /sys/xx/resources? Why not use VFIO like everything else? Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel