netdev - Re: [PATCH net-next v1 3/3] io_uring/zcrx: selftests: add test case for rss ctx

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Message-ID: <aAwSyL-N9g5p1z9o@LQ3V64L9R2>
Date: Fri, 25 Apr 2025 15:55:04 -0700
From: Joe Damato <jdamato@...tly.com>
To: David Wei <dw@...idwei.uk>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v1 3/3] io_uring/zcrx: selftests: add test case
 for rss ctx

On Thu, Apr 24, 2025 at 07:20:49PM -0700, David Wei wrote:
> RSS contexts are used to shard work across multiple queues for an
> application using io_uring zero copy receive. Add a test case checking
> that steering flows into an RSS context works.
> 
> Until I add multi-thread support to the selftest binary, this test case
> only has 1 queue in the RSS context.
> 
> Signed-off-by: David Wei <dw@...idwei.uk>
> ---
>  .../selftests/drivers/net/hw/iou-zcrx.py      | 41 +++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/tools/testing/selftests/drivers/net/hw/iou-zcrx.py b/tools/testing/selftests/drivers/net/hw/iou-zcrx.py
> index 0b0b6a261159..48b3d27cf472 100755
> --- a/tools/testing/selftests/drivers/net/hw/iou-zcrx.py
> +++ b/tools/testing/selftests/drivers/net/hw/iou-zcrx.py
> @@ -21,12 +21,25 @@ def _get_combined_channels(cfg):
>      return int(values[1])
>  
>  
> +    output = ethtool(f"-N {cfg.ifname} flow-type tcp6 dst-port 9999 action {chan}", host=cfg.remote).stdout
> +    rx_cmd = f"{cfg.bin_remote} -s -p 9999 -i {cfg.ifname} -q {combined_chans - 1}"
> +    tx_cmd = f"{cfg.bin_local} -c -h {cfg.remote_addr_v['6']} -p 9999 -l 12840"

I wonder if perhaps future cleanup work might use rand_port from
lib.py instead of hardcoding 9999 ?

Reviewed-by: Joe Damato <jdamato@...tly.com>