linux-kernel - Re: [PATCH net-next v3 0/4] net: lan966x: Add xdp support

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Message-ID: <Y22AYAqqY+U1IlNT@lunn.ch>
Date:   Thu, 10 Nov 2022 23:51:12 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        linux@...linux.org.uk, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v3 0/4] net: lan966x: Add xdp support

On Thu, Nov 10, 2022 at 05:21:48PM +0100, Alexander Lobakin wrote:
> From: Andrew Lunn <andrew@...n.ch>
> Date: Thu, 10 Nov 2022 14:57:35 +0100
> 
> > > Nice stuff! I hear time to time that XDP is for 10G+ NICs only, but
> > > I'm not a fan of such, and this series proves once again XDP fits
> > > any hardware ^.^
> > 
> > The Freescale FEC recently gained XDP support. Many variants of it are
> > Fast Ethernet only.
> > 
> > What i found most interesting about that patchset was that the use of
> > the page_ppol API made the driver significantly faster for the general
> > case as well as XDP.
> 
> The driver didn't have any page recycling or page splitting logics,
> while Page Pool recycles even pages from skbs if
> skb_mark_for_recycle() is used, which is the case here. So it
> significantly reduced the number of new page allocations for Rx, if
> there still are any at all.

When reviewing new drivers we should be pushing them towards using the
page pool API. It seems to do better than the average role your own
implementation.

	Andrew