netdev - RE: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC

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Message-ID: <DB8PR04MB6795DF1A354A33F3BE8F563CE6DD9@DB8PR04MB6795.eurprd04.prod.outlook.com>
Date:   Fri, 17 Sep 2021 10:39:18 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Colin Foster <colin.foster@...advantage.com>
CC:     Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write
 to ANA_PFC_PFC_CFG


> -----Original Message-----
> From: Colin Foster <colin.foster@...advantage.com>
> Sent: 2021年9月17日 11:38
> To: Joakim Zhang <qiangqing.zhang@....com>
> Cc: Vladimir Oltean <vladimir.oltean@....com>; Claudiu Manoil
> <claudiu.manoil@....com>; Alexandre Belloni
> <alexandre.belloni@...tlin.com>; UNGLinuxDriver@...rochip.com; David S.
> Miller <davem@...emloft.net>; Jakub Kicinski <kuba@...nel.org>;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write
> to ANA_PFC_PFC_CFG
> 
> On Fri, Sep 17, 2021 at 02:34:37AM +0000, Joakim Zhang wrote:
> >
> > Hi Vladimir,
> >
> > > -----Original Message-----
> > > From: Vladimir Oltean <vladimir.oltean@....com>
> > > Sent: 2021年9月16日 19:49
> > > To: Colin Foster <colin.foster@...advantage.com>
> > > Cc: Claudiu Manoil <claudiu.manoil@....com>; Alexandre Belloni
> > > <alexandre.belloni@...tlin.com>; UNGLinuxDriver@...rochip.com; David
> S.
> > > Miller <davem@...emloft.net>; Jakub Kicinski <kuba@...nel.org>;
> > > netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> > > Subject: Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and
> > > useless write to ANA_PFC_PFC_CFG
> > >
> > > On Wed, Sep 15, 2021 at 06:09:37PM -0700, Colin Foster wrote:
> > > > A useless write to ANA_PFC_PFC_CFG was left in while refactoring
> > > > ocelot to phylink. Since priority flow control is disabled,
> > > > writing the speed has no effect.
> > > >
> > > > Further, it was using ethtool.h SPEED_ instead of OCELOT_SPEED_
> > > > macros, which are incorrectly offset for GENMASK.
> > > >
> > > > Lastly, for priority flow control to properly function, some
> > > > scenarios would rely on the rate adaptation from the PCS while the
> > > > MAC speed would be fixed. So it isn't used, and even if it was, neither
> "speed"
> > > > nor "mac_speed" are necessarily the correct values to be used.
> > > >
> > > > Fixes: e6e12df625f2 ("net: mscc: ocelot: convert to phylink")
> > > > Signed-off-by: Colin Foster <colin.foster@...advantage.com>
> > > > ---
> > > >  drivers/net/ethernet/mscc/ocelot.c | 4 ----
> > > >  1 file changed, 4 deletions(-)
> > > >
> > > > diff --git a/drivers/net/ethernet/mscc/ocelot.c
> > > > b/drivers/net/ethernet/mscc/ocelot.c
> > > > index c581b955efb3..08be0440af28 100644
> > > > --- a/drivers/net/ethernet/mscc/ocelot.c
> > > > +++ b/drivers/net/ethernet/mscc/ocelot.c
> > > > @@ -569,10 +569,6 @@ void ocelot_phylink_mac_link_up(struct ocelot
> > > *ocelot, int port,
> > > >  	ocelot_port_writel(ocelot_port,
> DEV_CLOCK_CFG_LINK_SPEED(speed),
> > > >  			   DEV_CLOCK_CFG);
> > > >
> > > > -	/* No PFC */
> > > > -	ocelot_write_gix(ocelot,
> ANA_PFC_PFC_CFG_FC_LINK_SPEED(speed),
> > > > -			 ANA_PFC_PFC_CFG, port);
> > > > -
> > >
> > > This will conflict with the other patch.... why didn't you send both
> > > as part of a series? By not doing that, you are telling patchwork to
> > > build-test them in parallel, which of course does not work:
> > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpa
> > > tchw
> > >
> ork.kernel.org%2Fproject%2Fnetdevbpf%2Fpatch%2F20210916012341.518512
> > > -
> > >
> 1-colin.foster%40in-advantage.com%2F&amp;data=04%7C01%7Cqiangqing.zh
> > >
> ang%40nxp.com%7C546aa03ab17b45f0891a08d97908095f%7C686ea1d3bc2b
> > >
> 4c6fa92cd99c5c301635%7C0%7C0%7C637673897688805938%7CUnknown%7
> > >
> CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiL
> > >
> CJXVCI6Mn0%3D%7C1000&amp;sdata=fmGI6K2dS36tm5xuuKLKdVF1pEj9umv
> > > FLA8kyfXWD3A%3D&amp;reserved=0
> > >
> > > Also, why didn't you bump the version counter of the patch, and
> > > we're still at v1 despite the earlier attempt?
> > >
> > > git format-patch -2 --cover-letter --subject-prefix="PATCH v3 net"
> > > -o /opt/patches/linux/ocelot-phylink-fixes/v3/
> > > ./scripts/get_maintainer.pl
> > > /opt/patches/linux/ocelot-phylink-fixes/v3/*.patch
> > > ./scripts/checkpatch.pl --strict
> > > /opt/patches/linux/ocelot-phylink-fixes/v3/*.patch
> > > # Go through patches, write change log compared to v2 using vimdiff,
> > > meld, git range-diff, whatever # Write cover letter summarizing what
> changes and why.
> > > If fixing bugs explain the impact.
> > > git send-email \
> > > 	--to='netdev@...r.kernel.org' \
> > > 	--to='linux-kernel@...r.kernel.org' \
> > > 	--cc='Vladimir Oltean <vladimir.oltean@....com>' \
> > > 	--cc='Claudiu Manoil <claudiu.manoil@....com>' \
> > > 	--cc='Alexandre Belloni <alexandre.belloni@...tlin.com>' \
> > > 	--cc='UNGLinuxDriver@...rochip.com' \
> > > 	--cc='"David S. Miller" <davem@...emloft.net>' \
> > > 	--cc='Jakub Kicinski <kuba@...nel.org>' \
> > > 	/opt/patches/linux/ocelot-phylink-fixes/v3/*.patch
> > >
> > > Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
> > >
> > > Please keep this tag but resend a new version. You can download the
> > > patch with the review tags automatically using:
> > > git b4 20210916010938.517698-1-colin.foster@...advantage.com
> > > git b4 20210916012341.518512-1-colin.foster@...advantage.com
> > >
> > > where "git b4" is an alias configured like this in ~/.gitconfig:
> > >
> > > [b4]
> > > 	midmask =
> > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flo
> > >
> re.ker%2F&amp;data=04%7C01%7Cqiangqing.zhang%40nxp.com%7Cf6f8b45f
> 5e4
> > >
> a4d1b35bf08d9798c95f9%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0
> %7C6
> > >
> 37674466980672633%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD
> AiLCJQIj
> > >
> oiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=WCM%2
> FE6Sy
> > > 6ZXaNq3v7x%2BeIQ%2BX7P7bK2IZFUsBz55l%2BRU%3D&amp;reserved=0
> > >
> nel.org%2Fr%2F%2525s&amp;data=04%7C01%7Cqiangqing.zhang%40nxp.co
> > >
> m%7C546aa03ab17b45f0891a08d97908095f%7C686ea1d3bc2b4c6fa92cd99c5
> > >
> c301635%7C0%7C0%7C637673897688815892%7CUnknown%7CTWFpbGZsb3d
> > >
> 8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3
> > >
> D%7C1000&amp;sdata=t8N%2F%2FAnLVLtoMDzNDL%2Fv7ixEkBeiIqB6Go%2F
> > > zD19gisE%3D&amp;reserved=0
> > > [alias]
> > > 	b4 = "!f() { b4 am -t -o - $@ | git am -3; }; f"
> >
> > I came across this detailed suggestions, sometime we need download the
> > patch from the patchwork, so I have a try with above method(adding
> > these two symbol in my .gitconfig), but I met below error, could you please
> tell me what I am missing? Thanks.
> 
> One that I can answer.
> 
> b4 is a Python command.
> "pip install b4" should install it, then export /home/username/.local/bin into
> PATH "export PATH=/home/colin/.local/bin:$PATH"
> 
> You can add this path to ~/.profile if you want it to persist.

Thanks Colin,

But it still failed at my side, after I google, have not found a solution, could you please
help have a look about below error?

$ git b4 20210916010938.517698-1-colin.foster@...advantage.com
Traceback (most recent call last):
  File "/home/zqq/.local/bin/b4", line 7, in <module>
    from b4.command import cmd
  File "/home/zqq/.local/lib/python2.7/site-packages/b4/__init__.py", line 11, in <module>
    import email.policy
ImportError: No module named policy

Best Regards,
Joakim Zhang