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Date: Tue, 23 Nov 2021 10:00:45 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Chris Snook <chris.snook@...il.com>, Felix Fietkau <nbd@....name>,
Florian Fainelli <f.fainelli@...il.com>,
John Crispin <john@...ozen.org>,
Mark Lee <Mark-MC.Lee@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Michal Simek <michal.simek@...inx.com>,
Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>,
Sean Wang <sean.wang@...iatek.com>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <olteanv@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>,
"David S. Miller" <davem@...emloft.net>,
Heiner Kallweit <hkallweit1@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: [PATCH RFC net-next 7/8] net: phylink: use legacy_pre_march2020
Use the legacy flag to indicate whether we should operate in legacy
mode. This allows us to stop using the presence of a PCS as an
indicator to the age of the phylink user, and make PCS presence
optional.
Legacy mode involves:
1) calling mac_config() whenever the link comes up
2) calling mac_config() whenever the inband advertisement changes,
possibly followed by a call to mac_an_restart()
3) making use of mac_an_restart()
4) making use of mac_pcs_get_state()
All the above functionality was moved to a seperate "PCS" block of
operations in March 2020.
Update the documents to indicate that the differences that this flag
makes.
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
drivers/net/phy/phylink.c | 12 ++++++------
include/linux/phylink.h | 17 +++++++++++++++++
2 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 3603c024109a..a935655c39c0 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -742,7 +742,7 @@ static void phylink_mac_pcs_an_restart(struct phylink *pl)
phylink_autoneg_inband(pl->cur_link_an_mode)) {
if (pl->pcs_ops)
pl->pcs_ops->pcs_an_restart(pl->pcs);
- else
+ else if (pl->config->legacy_pre_march2020)
pl->mac_ops->mac_an_restart(pl->config);
}
}
@@ -803,7 +803,7 @@ static int phylink_change_inband_advert(struct phylink *pl)
if (test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state))
return 0;
- if (!pl->pcs_ops) {
+ if (!pl->pcs_ops && pl->config->legacy_pre_march2020) {
/* Legacy method */
phylink_mac_config(pl, &pl->link_config);
phylink_mac_pcs_an_restart(pl);
@@ -854,7 +854,8 @@ static void phylink_mac_pcs_get_state(struct phylink *pl,
if (pl->pcs_ops)
pl->pcs_ops->pcs_get_state(pl->pcs, state);
- else if (pl->mac_ops->mac_pcs_get_state)
+ else if (pl->mac_ops->mac_pcs_get_state &&
+ pl->config->legacy_pre_march2020)
pl->mac_ops->mac_pcs_get_state(pl->config, state);
else
state->link = 0;
@@ -1024,12 +1025,11 @@ static void phylink_resolve(struct work_struct *w)
}
phylink_major_config(pl, false, &link_state);
pl->link_config.interface = link_state.interface;
- } else if (!pl->pcs_ops) {
+ } else if (!pl->pcs_ops && pl->config->legacy_pre_march2020) {
/* The interface remains unchanged, only the speed,
* duplex or pause settings have changed. Call the
* old mac_config() method to configure the MAC/PCS
- * only if we do not have a PCS installed (an
- * unconverted user.)
+ * only if we do not have a legacy MAC driver.
*/
phylink_mac_config(pl, &link_state);
}
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index d005b8e36048..a2f266cc3442 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -190,6 +190,10 @@ void validate(struct phylink_config *config, unsigned long *supported,
* negotiation completion state in @state->an_complete, and link up state
* in @state->link. If possible, @state->lp_advertising should also be
* populated.
+ *
+ * Note: This is a legacy method. This function will not be called unless
+ * legacy_pre_march2020 is set in &struct phylink_config and there is no
+ * PCS attached.
*/
void mac_pcs_get_state(struct phylink_config *config,
struct phylink_link_state *state);
@@ -230,6 +234,15 @@ int mac_prepare(struct phylink_config *config, unsigned int mode,
* guaranteed to be correct, and so any mac_config() implementation must
* never reference these fields.
*
+ * Note: For legacy March 2020 drivers (drivers with legacy_pre_march2020 set
+ * in their &phylnk_config and which don't have a PCS), this function will be
+ * called on each link up event, and to also change the in-band advert. For
+ * non-legacy drivers, it will only be called to reconfigure the MAC for a
+ * "major" change in e.g. interface mode. It will not be called for changes
+ * in speed, duplex or pause modes or to change the in-band advertisement.
+ * In any case, it is strongly preferred that speed, duplex and pause settings
+ * are handled in the mac_link_up() method and not in this method.
+ *
* (this requires a rewrite - please refer to mac_link_up() for situations
* where the PCS and MAC are not tightly integrated.)
*
@@ -314,6 +327,10 @@ int mac_finish(struct phylink_config *config, unsigned int mode,
/**
* mac_an_restart() - restart 802.3z BaseX autonegotiation
* @config: a pointer to a &struct phylink_config.
+ *
+ * Note: This is a legacy method. This function will not be called unless
+ * legacy_pre_march2020 is set in &struct phylink_config and there is no
+ * PCS attached.
*/
void mac_an_restart(struct phylink_config *config);
--
2.30.2
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