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SubjectRe: [PATCH net-next v7 3/3] net: axienet: Introduce dmaengine support
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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 <radhey.shyam.pandey@amd.com>
> ---
[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

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