linux-kernel - Re: [PATCH iwl-net 1/3] ice: remove af_xdp_zc

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Date: Thu, 16 May 2024 09:27:54 +0100
From: Simon Horman <horms@...nel.org>
To: Larysa Zaremba <larysa.zaremba@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org,
	Jacob Keller <jacob.e.keller@...el.com>,
	maciej.fijalkowski@...el.com,
	Magnus Karlsson <magnus.karlsson@...il.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	igor.bagnucki@...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>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH iwl-net 1/3] ice: remove af_xdp_zc_qps bitmap

On Wed, May 15, 2024 at 06:02:14PM +0200, Larysa Zaremba wrote:
> Referenced commit has introduced a bitmap to distinguish between ZC and
> copy-mode AF_XDP queues, because xsk_get_pool_from_qid() does not do this
> for us.
> 
> The bitmap would be especially useful when restoring previous state after
> rebuild, if only it was not reallocated in the process. This leads to e.g.
> xdpsock dying after changing number of queues.
> 
> Instead of preserving the bitmap during the rebuild, remove it completely
> and distinguish between ZC and copy-mode queues based on the presence of
> a device associated with the pool.
> 
> Fixes: e102db780e1c ("ice: track AF_XDP ZC enabled queues in bitmap")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>

Reviewed-by: Simon Horman <horms@...nel.org>