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

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Date: Mon, 4 Mar 2024 17:16:48 +0100
From: Julien Panis <jpanis@...libre.com>
To: Andrew Lunn <andrew@...n.ch>
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

On 3/1/24 17:38, Andrew Lunn wrote:
> On Fri, Mar 01, 2024 at 04:02:53PM +0100, Julien Panis wrote:
>> This patch adds XDP (eXpress Data Path) support to TI AM65 CPSW
>> Ethernet driver. The following features are implemented:
>> - NETDEV_XDP_ACT_BASIC (XDP_PASS, XDP_TX, XDP_DROP, XDP_ABORTED)
>> - NETDEV_XDP_ACT_REDIRECT (XDP_REDIRECT)
>> - NETDEV_XDP_ACT_NDO_XMIT (ndo_xdp_xmit callback)
>>
>> The page pool memory model is used to get better performance.
> Do you have any benchmark numbers? It should help with none XDP
> traffic as well. So maybe iperf numbers before and after?
>
> 	Andrew

OK, I will add benchmark numbers in the next version.

I will also fix a potential issue with TX buffer type, which is not properly
handled in this v2. It should be set for each buffer, I think (instead of just
being set for the tx channel before initiating xmit).

Julien