[PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

Subsystems: networking drivers, ocelot ethernet switch driver, the rest

STALE1786d

9 messages, 5 authors, 2021-09-17 · open the first message on its own page

[PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Colin Foster <colin.foster@in-advantage.com>
Date: 2021-09-16 01:10:27

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@in-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);
-
 	/* Core: Enable port for frame transfer */
 	ocelot_fields_write(ocelot, port,
 			    QSYS_SWITCH_PORT_MODE_PORT_ENA, 1);
-- 
2.25.1

Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: 2021-09-16 11:49:26

On Wed, Sep 15, 2021 at 06:09:37PM -0700, Colin Foster wrote:
quoted hunk
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@in-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://patchwork.kernel.org/project/netdevbpf/patch/20210916012341.518512-1-colin.foster@in-advantage.com/

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@vger.kernel.org' \
	--to='linux-kernel@vger.kernel.org' \
	--cc='Vladimir Oltean [off-list ref]' \
	--cc='Claudiu Manoil [off-list ref]' \
	--cc='Alexandre Belloni [off-list ref]' \
	--cc='UNGLinuxDriver@microchip.com' \
	--cc='"David S. Miller" [off-list ref]' \
	--cc='Jakub Kicinski [off-list ref]' \
	/opt/patches/linux/ocelot-phylink-fixes/v3/*.patch

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.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@in-advantage.com
git b4 20210916012341.518512-1-colin.foster@in-advantage.com

where "git b4" is an alias configured like this in ~/.gitconfig:

[b4]
	midmask = https://lore.kernel.org/r/%s
[alias]
	b4 = "!f() { b4 am -t -o - $@ | git am -3; }; f"

Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Jakub Kicinski <kuba@kernel.org>
Date: 2021-09-16 14:52:43

On Thu, 16 Sep 2021 11:49:18 +0000 Vladimir Oltean wrote:
git format-patch -2 --cover-letter 
Nice instructions, let me toss this version from pw.

FWIW the patchwork checks don't complain about 2-patch series without 
a cover letter [1]. Having cover letters is a good rule of thumb but 
I thought I'd mention that 'cause unlikely anyone would realize otherwise.

[1] https://github.com/kuba-moo/nipa/blob/master/tests/series/cover_letter/test.py

Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: 2021-09-16 14:56:46

On Thu, Sep 16, 2021 at 07:52:39AM -0700, Jakub Kicinski wrote:
On Thu, 16 Sep 2021 11:49:18 +0000 Vladimir Oltean wrote:
quoted
git format-patch -2 --cover-letter
Nice instructions, let me toss this version from pw.

FWIW the patchwork checks don't complain about 2-patch series without
a cover letter [1]. Having cover letters is a good rule of thumb but
I thought I'd mention that 'cause unlikely anyone would realize otherwise.

[1] https://github.com/kuba-moo/nipa/blob/master/tests/series/cover_letter/test.py
In my certainly limited experience I have found out that forcing
yourself to write a change log and a cover letter makes you think more,
which is sadly sometimes needed.

Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Colin Foster <colin.foster@in-advantage.com>
Date: 2021-09-17 01:24:46

On Thu, Sep 16, 2021 at 11:49:18AM +0000, Vladimir Oltean wrote:
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://patchwork.kernel.org/project/netdevbpf/patch/20210916012341.518512-1-colin.foster@in-advantage.com/

Also, why didn't you bump the version counter of the patch, and we're
still at v1 despite the earlier attempt?
I wasn't sure if changing the names of the patch and the intent is what 
would constitute a new "patch series" so then restart the counter for 
the counters or not. I had figured "two new patches, two new counters"
which I understand now was incorrect.

In this particular case, should I have stuck with my first submission
title:
[PATCH v2 net] bug fix when writing MAC speed
and submitted the two patches? 

I assume it would only cause headaches if I incremented the counter and
changed the name to something like
[PATCH v2 net] remove unnecessary register writes
or something simliar? Although your example below suggests I should
maybe submit the next set as
[PATCH v3 net] ocelot phylink fixes
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@vger.kernel.org' \
	--to='linux-kernel@vger.kernel.org' \
	--cc='Vladimir Oltean [off-list ref]' \
	--cc='Claudiu Manoil [off-list ref]' \
	--cc='Alexandre Belloni [off-list ref]' \
	--cc='UNGLinuxDriver@microchip.com' \
	--cc='"David S. Miller" [off-list ref]' \
	--cc='Jakub Kicinski [off-list ref]' \
	/opt/patches/linux/ocelot-phylink-fixes/v3/*.patch
I've been using --to-cmd and --cc-cmd with get_maintainer.pl. If this is
ill-advised, I'll stop. I noticed it seemed to determine the list on a
per-patch-file basis instead of generating one single list.
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.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@in-advantage.com
git b4 20210916012341.518512-1-colin.foster@in-advantage.com

where "git b4" is an alias configured like this in ~/.gitconfig:

[b4]
	midmask = https://lore.kernel.org/r/%s
[alias]
	b4 = "!f() { b4 am -t -o - $@ | git am -3; }; f"
Thank you for all this. I understand you have better things to do than
to hold my hand through this process, so I greatly appreciate your help.

RE: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Joakim Zhang <hidden>
Date: 2021-09-17 02:35:22

Hi Vladimir,
-----Original Message-----
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Sent: 2021年9月16日 19:49
To: Colin Foster <colin.foster@in-advantage.com>
Cc: Claudiu Manoil <claudiu.manoil@nxp.com>; Alexandre Belloni
[off-list ref]; UNGLinuxDriver@microchip.com; David S.
Miller [off-list ref]; Jakub Kicinski [off-list ref];
netdev@vger.kernel.org; linux-kernel@vger.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:
quoted
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@in-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,
quoted
 	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%2Fpatchw
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@vger.kernel.org' \
	--to='linux-kernel@vger.kernel.org' \
	--cc='Vladimir Oltean [off-list ref]' \
	--cc='Claudiu Manoil [off-list ref]' \
	--cc='Alexandre Belloni [off-list ref]' \
	--cc='UNGLinuxDriver@microchip.com' \
	--cc='"David S. Miller" [off-list ref]' \
	--cc='Jakub Kicinski [off-list ref]' \
	/opt/patches/linux/ocelot-phylink-fixes/v3/*.patch

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.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@in-advantage.com
git b4 20210916012341.518512-1-colin.foster@in-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%2Flore.ker
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.

$ git b4 20210916010938.517698-1-colin.foster@in-advantage.com
f() { b4 am -t -o - $@ | git am -3; }; f: 1: f() { b4 am -t -o - $@ | git am -3; }; f: b4: not found

Best Regards,
Joakim Zhang

Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Colin Foster <colin.foster@in-advantage.com>
Date: 2021-09-17 03:38:19

On Fri, Sep 17, 2021 at 02:34:37AM +0000, Joakim Zhang wrote:
Hi Vladimir,
quoted
-----Original Message-----
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Sent: 2021年9月16日 19:49
To: Colin Foster <colin.foster@in-advantage.com>
Cc: Claudiu Manoil <claudiu.manoil@nxp.com>; Alexandre Belloni
[off-list ref]; UNGLinuxDriver@microchip.com; David S.
Miller [off-list ref]; Jakub Kicinski [off-list ref];
netdev@vger.kernel.org; linux-kernel@vger.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:
quoted
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@in-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,
quoted
 	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%2Fpatchw
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@vger.kernel.org' \
	--to='linux-kernel@vger.kernel.org' \
	--cc='Vladimir Oltean [off-list ref]' \
	--cc='Claudiu Manoil [off-list ref]' \
	--cc='Alexandre Belloni [off-list ref]' \
	--cc='UNGLinuxDriver@microchip.com' \
	--cc='"David S. Miller" [off-list ref]' \
	--cc='Jakub Kicinski [off-list ref]' \
	/opt/patches/linux/ocelot-phylink-fixes/v3/*.patch

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.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@in-advantage.com
git b4 20210916012341.518512-1-colin.foster@in-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%2Flore.ker
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.
$ git b4 20210916010938.517698-1-colin.foster@in-advantage.com
f() { b4 am -t -o - $@ | git am -3; }; f: 1: f() { b4 am -t -o - $@ | git am -3; }; f: b4: not found

Best Regards,
Joakim Zhang

RE: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Joakim Zhang <hidden>
Date: 2021-09-17 10:39:24

-----Original Message-----
From: Colin Foster <colin.foster@in-advantage.com>
Sent: 2021年9月17日 11:38
To: Joakim Zhang <redacted>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>; Claudiu Manoil
[off-list ref]; Alexandre Belloni
[off-list ref]; UNGLinuxDriver@microchip.com; David S.
Miller [off-list ref]; Jakub Kicinski [off-list ref];
netdev@vger.kernel.org; linux-kernel@vger.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:
quoted
Hi Vladimir,
quoted
-----Original Message-----
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Sent: 2021年9月16日 19:49
To: Colin Foster <colin.foster@in-advantage.com>
Cc: Claudiu Manoil <claudiu.manoil@nxp.com>; Alexandre Belloni
[off-list ref]; UNGLinuxDriver@microchip.com; David
S.
quoted
quoted
Miller [off-list ref]; Jakub Kicinski [off-list ref];
netdev@vger.kernel.org; linux-kernel@vger.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:
quoted
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"
quoted
quoted
quoted
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@in-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,
quoted
 	ocelot_port_writel(ocelot_port,
DEV_CLOCK_CFG_LINK_SPEED(speed),
quoted
quoted
quoted
 			   DEV_CLOCK_CFG);

-	/* No PFC */
-	ocelot_write_gix(ocelot,
ANA_PFC_PFC_CFG_FC_LINK_SPEED(speed),
quoted
quoted
quoted
-			 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
quoted
quoted
-
1-colin.foster%40in-advantage.com%2F&amp;data=04%7C01%7Cqiangqing.zh
quoted
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ang%40nxp.com%7C546aa03ab17b45f0891a08d97908095f%7C686ea1d3bc2b
quoted
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4c6fa92cd99c5c301635%7C0%7C0%7C637673897688805938%7CUnknown%7
quoted
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CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiL
quoted
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CJXVCI6Mn0%3D%7C1000&amp;sdata=fmGI6K2dS36tm5xuuKLKdVF1pEj9umv
quoted
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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.
quoted
quoted
If fixing bugs explain the impact.
git send-email \
	--to='netdev@vger.kernel.org' \
	--to='linux-kernel@vger.kernel.org' \
	--cc='Vladimir Oltean [off-list ref]' \
	--cc='Claudiu Manoil [off-list ref]' \
	--cc='Alexandre Belloni [off-list ref]' \
	--cc='UNGLinuxDriver@microchip.com' \
	--cc='"David S. Miller" [off-list ref]' \
	--cc='Jakub Kicinski [off-list ref]' \
	/opt/patches/linux/ocelot-phylink-fixes/v3/*.patch

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.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@in-advantage.com
git b4 20210916012341.518512-1-colin.foster@in-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
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a4d1b35bf08d9798c95f9%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0
%7C6
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quoted
37674466980672633%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD
AiLCJQIj
quoted
quoted
oiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=WCM%2
FE6Sy
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6ZXaNq3v7x%2BeIQ%2BX7P7bK2IZFUsBz55l%2BRU%3D&amp;reserved=0
nel.org%2Fr%2F%2525s&amp;data=04%7C01%7Cqiangqing.zhang%40nxp.co
quoted
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m%7C546aa03ab17b45f0891a08d97908095f%7C686ea1d3bc2b4c6fa92cd99c5
quoted
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c301635%7C0%7C0%7C637673897688815892%7CUnknown%7CTWFpbGZsb3d
quoted
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8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3
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D%7C1000&amp;sdata=t8N%2F%2FAnLVLtoMDzNDL%2Fv7ixEkBeiIqB6Go%2F
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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@in-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

Re: [PATCH v1 net] net: mscc: ocelot: remove buggy and useless write to ANA_PFC_PFC_CFG

From: Konstantin Ryabitsev <hidden>
Date: 2021-09-17 13:50:06

On Fri, Sep 17, 2021 at 10:39:18AM +0000, Joakim Zhang wrote:
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@in-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>
                              ^^^^^^^^^^^
You seem to be trying to run it with python 2.7
    import email.policy
ImportError: No module named policy
I'm not sure how you managed to make it install, but it won't work with python
versions < 3.6. Python version 2 is no longer maintained.

-K
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