linux-kernel - Re: [PATCH v2 2/2] net: ethernet: ti: am65-cpsw: Add minimal XDP support

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Date: Tue, 5 Mar 2024 17:43:43 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Julien Panis <jpanis@...libre.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v2 2/2] net: ethernet: ti: am65-cpsw: Add minimal XDP
 support

> 3) From 2), am65_cpsw_alloc_skb() function removed and replaced by
> netdev_alloc_skb_ip_align(), as used by the driver before -> res = 506
> Conclusion: Here is where the loss comes from.
> IOW, My am65_cpsw_alloc_skb() function is not good.
> 
> Initially, I mainly created this 'custom' am65_cpsw_alloc_skb() function
> because I thought that none of XDP memory models could be used along
> with netdev_alloc_skb_ip_align() function. Was I wrong ?
> By creating this custom am65_cpsw_alloc_skb(), I also wanted to handle
> the way headroom is reserved differently.

What is special about your device? Why would
netdev_alloc_skb_ip_align() not work?

	Andrew