netdev - Re: [PATCH net-next 4/5] i40e: Fix broken support for floating VEBs

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Date: Fri, 16 Feb 2024 14:49:04 -0800
From: Jacob Keller <jacob.e.keller@...el.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<netdev@...r.kernel.org>
CC: Ivan Vecera <ivecera@...hat.com>, Wojciech Drewek
	<wojciech.drewek@...el.com>, Pucha Himasekhar Reddy
	<himasekharx.reddy.pucha@...el.com>, Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net-next 4/5] i40e: Fix broken support for floating VEBs



On 2/16/2024 1:42 PM, Tony Nguyen wrote:
> From: Ivan Vecera <ivecera@...hat.com>
> 
> Although the i40e supports so-called floating VEB (VEB without
> an uplink connection to external network), this support is
> broken. This functionality is currently unused (except debugfs)
> but it will be used by subsequent series for switchdev mode
> slow-path. Fix this by following:
> > 1) Handle correctly floating VEB (VEB with uplink_seid == 0)
>    in i40e_reconstitute_veb() and look for owner VSI and
>    create it only for non-floating VEBs and also set bridge
>    mode only for such VEBs as the floating ones are using
>    always VEB mode.
> 2) Handle correctly floating VEB in i40e_veb_release() and
>    disallow its release when there are some VSIs. This is
>    different from regular VEB that have owner VSI that is
>    connected to VEB's uplink after VEB deletion by FW.
> 3) Fix i40e_add_veb() to handle 'vsi' that is NULL for floating
>    VEBs. For floating VEB use 0 for downlink SEID and 'true'
>    for 'default_port' parameters as per datasheet.
> 4) Fix 'add relay' command in i40e_dbg_command_write() to allow
>    to create floating VEB by 'add relay 0 0' or 'add relay'
> 

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>