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Mon, 09 Oct 2023 13:20:40 -0700 (PDT) Message-ID: <995341e0-d2d7-451e-bd8b-0741cb98bcff@gmail.com> Date: Mon, 9 Oct 2023 13:20:36 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v7 3/3] net: axienet: Introduce dmaengine support Content-Language: en-US To: Radhey Shyam Pandey , davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, michal.simek@amd.com, linux@armlinux.org.uk Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, git@amd.com References: <1695843151-1919509-1-git-send-email-radhey.shyam.pandey@amd.com> <1695843151-1919509-4-git-send-email-radhey.shyam.pandey@amd.com> From: Florian Fainelli In-Reply-To: <1695843151-1919509-4-git-send-email-radhey.shyam.pandey@amd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=3.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_SBL_CSS, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Mon, 09 Oct 2023 13:21:18 -0700 (PDT) X-Spam-Level: ** On 9/27/23 12:32, Radhey Shyam Pandey wrote: > Add dmaengine framework to communicate with the xilinx DMAengine > driver(AXIDMA). > > Axi ethernet driver uses separate channels for transmit and receive. > Add support for these channels to handle TX and RX with skb and > appropriate callbacks. Also add axi ethernet core interrupt for > dmaengine framework support. > > The dmaengine framework was extended for metadata API support. > However it still needs further enhancements to make it well suited for > ethernet usecases. The ethernet features i.e ethtool set/get of DMA IP > properties, ndo_poll_controller,(mentioned in TODO) are not supported > and it requires follow-up discussions. > > dmaengine support has a dependency on xilinx_dma as it uses > xilinx_vdma_channel_set_config() API to reset the DMA IP > which internally reset MAC prior to accessing MDIO. > > Benchmark with netperf: > > xilinx-zcu102-20232:~$ netperf -H 192.168.10.20 -t TCP_STREAM > MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET > to 192.168.10.20 () port 0 AF_INET > Recv Send Send > Socket Socket Message Elapsed > Size Size Size Time Throughput > bytes bytes bytes secs. 10^6bits/sec > > 131072 16384 16384 10.03 915.55 > > xilinx-zcu102-20232:~$ netperf -H 192.168.10.20 -t UDP_STREAM > MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET > to 192.168.10.20 () port 0 AF_INET > Socket Message Elapsed Messages > Size Size Time Okay Errors Throughput > bytes bytes secs # # 10^6bits/sec > > 212992 65507 10.00 18192 0 953.35 > 212992 10.00 18192 953.35 > > Signed-off-by: Radhey Shyam Pandey > --- [snip] > /** > * axienet_tx_poll - Invoked once a transmit is completed by the > * Axi DMA Tx channel. > @@ -911,7 +1036,43 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev) > if (!lp->use_dmaengine) > return axienet_start_xmit_legacy(skb, ndev); > else > - return NETDEV_TX_BUSY; > + return axienet_start_xmit_dmaengine(skb, ndev); Did not notice this before, but should consider using a separate set of net_device_ops with a different ndo_start_xmit() implementation, rather than add another layer of indirection here. -- Florian