netdev - RE: [EXT] Re: [PATCH v3 1/1] net: fec: add xdp and page pool statistics

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Message-ID: <PAXPR04MB91858E0EEBE5D22EF6974E3C89059@PAXPR04MB9185.eurprd04.prod.outlook.com>
Date:   Mon, 14 Nov 2022 15:31:20 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Wei Fang <wei.fang@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        kernel test robot <lkp@...el.com>
Subject: RE: [EXT] Re: [PATCH v3 1/1] net: fec: add xdp and page pool
 statistics



> -----Original Message-----
> From: Alexander Lobakin <alexandr.lobakin@...el.com>
> Sent: Monday, November 14, 2022 9:28 AM
> To: Shenwei Wang <shenwei.wang@....com>
> Cc: Alexander Lobakin <alexandr.lobakin@...el.com>; David S. Miller
> <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub
> Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Alexei
> Starovoitov <ast@...nel.org>; Daniel Borkmann <daniel@...earbox.net>;
> Jesper Dangaard Brouer <hawk@...nel.org>; John Fastabend
> <john.fastabend@...il.com>; Wei Fang <wei.fang@....com>;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; imx@...ts.linux.dev;
> kernel test robot <lkp@...el.com>
> > > <daniel@...earbox.net>;
> > >> @@ -29,6 +29,7 @@ config FEC
> > >>       select CRC32
> > >>       select PHYLIB
> > >>       select PAGE_POOL
> > >> +     select PAGE_POOL_STATS
> > >
> > > Drivers should never select PAGE_POOL_STATS. This Kconfig option was
> > > made to allow user to choose whether he wants stats or better
> > > performance on slower systems. It's pure user choice, if something
> > > doesn't build or link, it must be guarded with
> IS_ENABLED(CONFIG_PAGE_POOL_STATS).
> >
> > As the PAGE_POOL_STATS is becoming the infrastructure codes for many
> > drivers, it is redundant for every driver to implement the stub
> > function in case it is not selected. These stub functions should be provided by
> PAGE_POOL_STATS itself if the option is not selected.
> 
> Correct, but I think you added 'select PAGE_POOL_STATS' due to some build
> issues on PPC64, or not? So if there are any when !PAGE_POOL_STATS, it's
> always better to handle this at the Page Pool API level in a separate patch.

Yes, the 'select PAGE_POOL_STATS' was added because of the building failure
found on PPC64 platform.

Thanks,
Shenwei

> 
> >
> > >
> > >>       imply NET_SELFTESTS
> > >>       help
> > >>         Say Y here if you want to use the built-in 10/100 Fast
> 
> Thanks,
> Olek