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

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Date: Mon, 26 Feb 2024 17:25:33 +0000
From: Simon Horman <horms@...nel.org>
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>,
	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] net: ethernet: ti: am65-cpsw: Add minimal XDP support

On Fri, Feb 23, 2024 at 12:01:37PM +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)
> 
> Signed-off-by: Julien Panis <jpanis@...libre.com>

..

> @@ -440,6 +476,27 @@ static void am65_cpsw_nuss_tx_cleanup(void *data, dma_addr_t desc_dma)
>  	dev_kfree_skb_any(skb);
>  }
>  
> +static struct sk_buff *am65_cpsw_alloc_skb(struct net_device *ndev, unsigned int len)
> +{
> +	struct page *page;
> +	struct sk_buff *skb;

nit: please arrange local variables in reverse xmas tree order,
     from longest line to shortest in new code.

     This tool can be useful: https://github.com/ecree-solarflare/xmastree

> +
> +	page = dev_alloc_pages(0);

nit: Maybe dev_alloc_page() is appropriate here?

> +	if (unlikely(!page))
> +		return NULL;
> +
> +	len += AM65_CPSW_HEADROOM;
> +
> +	skb = build_skb(page_address(page), len);
> +	if (unlikely(!skb))

Does page need to be freed here?

> +		return NULL;
> +
> +	skb_reserve(skb, AM65_CPSW_HEADROOM + NET_IP_ALIGN);
> +	skb->dev = ndev;
> +
> +	return skb;
> +}

..