[PATCH v1] examples/l3fwd: relax the RSS/Offload requirement

[Stephen Hemminger]

On Sun,  3 Sep 2023 04:01:11 +0000
Trevor Tao <taozj888 at 163.com> wrote:

> Now the port Rx mq_mode had been set to RTE_ETH_MQ_RX_RSS, and offload
> mode set to RTE_ETH_RX_OFFLOAD_CHECKSUM by default, but some hardware
> and/or virtual interface does not support the RSS and offload mode
> presupposed, e.g., some virtio interfaces in the cloud don't support
> RSS and may only partly support RTE_ETH_RX_OFFLOAD_UDP_CKSUM/
> RTE_ETH_RX_OFFLOAD_TCP_CKSUM,
> but not RTE_ETH_RX_OFFLOAD_IPV4_CKSUM, and the error msg here:
> 
> virtio_dev_configure(): RSS support requested but not supported by
> the device
> Port0 dev_configure = -95
> 
> and:
> Ethdev port_id=0 requested Rx offloads 0xe does not match Rx offloads
> capabilities 0x201d in rte_eth_dev_configure()
> 
> So to enable the l3fwd running in that environment, the Rx mode requirement
> can be relaxed to reflect the hardware feature reality here, and the l3fwd
> can run smoothly then.
> A warning msg would be provided to user in case it happens here.
> 
> On the other side, enabling the software cksum check in case the
> hw support missing.
> 
> Fixes: af75078fece3 ("first public release")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Trevor Tao <taozj888 at 163.com>

Multiple queue without RSS and rte_flow support is kind of useless.
All packets will arrive on one queue.