Re: [dpdk-dev] [PATCH v3 5/5] examples/l3fwd-power: support virtio/vhost

["Xia, Chenbo" <chenbo.xia@intel.com>]

> -----Original Message-----
> From: Li, Miao <miao.li@intel.com>
> Sent: Friday, September 24, 2021 6:23 PM
> To: dev@dpdk.org
> Cc: Xia, Chenbo <chenbo.xia@intel.com>; maxime.coquelin@redhat.com; Li, Miao
> <miao.li@intel.com>
> Subject: [PATCH v3 5/5] examples/l3fwd-power: support virtio/vhost
> 
> In l3fwd-power, there is default port configuration which requires
> RSS and IPV4/UDP/TCP checksum. Once device does not support these,
> the l3fwd-power will exit and report an error.
> This patch updates the port configuration based on device capabilities
> after getting the device information to support devices like virtio
> and vhost.
> 
> Signed-off-by: Miao Li <miao.li@intel.com>
> ---
>  examples/l3fwd-power/main.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
> index aa7b8db44a..14ae87a9d5 100644
> --- a/examples/l3fwd-power/main.c
> +++ b/examples/l3fwd-power/main.c
> @@ -2637,6 +2637,11 @@ main(int argc, char **argv)
>  				local_port_conf.rx_adv_conf.rss_conf.rss_hf);
>  		}
> 
> +		if (local_port_conf.rx_adv_conf.rss_conf.rss_hf == 0)
> +			local_port_conf.rxmode.mq_mode = ETH_MQ_RX_NONE;
> +		local_port_conf.rxmode.offloads &= dev_info.rx_offload_capa;
> +		port_conf.rxmode.offloads = local_port_conf.rxmode.offloads;
> +
>  		ret = rte_eth_dev_configure(portid, nb_rx_queue,
>  					(uint16_t)n_tx_queue, &local_port_conf);
>  		if (ret < 0)
> --
> 2.25.1

Just as David suggested, I think we'd better consider RFC 1812, if HW does not
support RX IP CKSUM offload, check IP CKSUM in is_valid_ipv4_pkt.

Thanks,
Chenbo