linux-kernel - Re: [PATCH iwl-net v2 3/6] ice: check for XDP rings instead of bpf program when unconfiguring

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Message-ID: <04b468d6-713c-4a87-9fd3-4821626c4244@intel.com>
Date: Wed, 24 Jul 2024 11:25:16 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Larysa Zaremba <larysa.zaremba@...el.com>,
	<intel-wired-lan@...ts.osuosl.org>
CC: Tony Nguyen <anthony.l.nguyen@...el.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Alexei Starovoitov
	<ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, "Jesper Dangaard
 Brouer" <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, "Maciej
 Fijalkowski" <maciej.fijalkowski@...el.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
	<magnus.karlsson@...el.com>, Michal Kubiak <michal.kubiak@...el.com>,
	Wojciech Drewek <wojciech.drewek@...el.com>, Amritha Nambiar
	<amritha.nambiar@...el.com>
Subject: Re: [PATCH iwl-net v2 3/6] ice: check for XDP rings instead of bpf
 program when unconfiguring



On 7/24/2024 9:48 AM, Larysa Zaremba wrote:
> If VSI rebuild is pending, .ndo_bpf() can attach/detach the XDP program on
> VSI without applying new ring configuration. When unconfiguring the VSI, we
> can encounter the state in which there is an XDP program but no XDP rings
> to destroy or there will be XDP rings that need to be destroyed, but no XDP
> program to indicate their presence.
> 
> When unconfiguring, rely on the presence of XDP rings rather then XDP
> program, as they better represent the current state that has to be
> destroyed.
> 
> Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
> Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
> ---

Right. When operating on the rings, we should be checking xdp_rings. Ok.

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