netdev - Re: [PATCH net-next 03/16] libeth: xdp: add XDP

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Message-ID: <20250527190309.156f3047@kernel.org>
Date: Tue, 27 May 2025 19:03:09 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: davem@...emloft.net, pabeni@...hat.com, edumazet@...gle.com,
 andrew+netdev@...n.ch, netdev@...r.kernel.org, Alexander Lobakin
 <aleksander.lobakin@...el.com>, maciej.fijalkowski@...el.com,
 magnus.karlsson@...el.com, michal.kubiak@...el.com,
 przemyslaw.kitszel@...el.com, ast@...nel.org, daniel@...earbox.net,
 hawk@...nel.org, john.fastabend@...il.com, horms@...nel.org,
 bpf@...r.kernel.org
Subject: Re: [PATCH net-next 03/16] libeth: xdp: add XDP_TX buffers sending

On Tue, 20 May 2025 13:59:04 -0700 Tony Nguyen wrote:
> +	if (sinfo || !netmem_is_net_iov(netmem)) {
> +		const struct page_pool *pp = __netmem_get_pp(netmem);
> +
> +		dma_sync_single_for_device(pp->p.dev, desc.addr, desc.len,
> +					   DMA_BIDIRECTIONAL);
> +	}

How can we get an unreadable netmem into the XDP Tx path?