netdev - [PATCH RFC net-next v3 10/27] net: ethtool: Add support for new PSE device index description

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Message-Id: <20241121-feature_poe_port_prio-v3-10-83299fa6967c@bootlin.com>
Date: Thu, 21 Nov 2024 15:42:36 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>, Oleksij Rempel <o.rempel@...gutronix.de>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Jonathan Corbet <corbet@....net>, Donald Hunter <donald.hunter@...il.com>, 
 Rob Herring <robh@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>, 
 Simon Horman <horms@...nel.org>, Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 linux-doc@...r.kernel.org, Kyle Swenson <kyle.swenson@....tech>, 
 Dent Project <dentproject@...uxfoundation.org>, kernel@...gutronix.de, 
 Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH RFC net-next v3 10/27] net: ethtool: Add support for new
 PSE device index description

From: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>

Add functionality to report the newly introduced PSE device index to
the user, enabling better identification and management of PSE devices.

Reviewed-by: Oleksij Rempel <o.rempel@...gutronix.de>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---

Changes in v2:
- new patch.
---
 Documentation/networking/ethtool-netlink.rst | 4 ++++
 include/uapi/linux/ethtool_netlink.h         | 1 +
 net/ethtool/pse-pd.c                         | 4 ++++
 3 files changed, 9 insertions(+)

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index b25926071ece..bd7173d1fa4d 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -1766,6 +1766,7 @@ Kernel response contents:
                                                       limit of the PoE PSE.
   ``ETHTOOL_A_C33_PSE_PW_LIMIT_RANGES``       nested  Supported power limit
                                                       configuration ranges.
+  ``ETHTOOL_A_PSE_ID``                           u32  Index of the PSE
   ==========================================  ======  =============================

 When set, the optional ``ETHTOOL_A_PODL_PSE_ADMIN_STATE`` attribute identifies
@@ -1839,6 +1840,9 @@ identifies the C33 PSE power limit ranges through
 If the controller works with fixed classes, the min and max values will be
 equal.

+The ``ETHTOOL_A_PSE_ID`` attribute identifies the index of the PSE
+controller.
+
 PSE_SET
 =======

diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 283305f6b063..9a4c293a9a82 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -970,6 +970,7 @@ enum {
 	ETHTOOL_A_C33_PSE_EXT_SUBSTATE,		/* u32 */
 	ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT,	/* u32 */
 	ETHTOOL_A_C33_PSE_PW_LIMIT_RANGES,	/* nest - _C33_PSE_PW_LIMIT_* */
+	ETHTOOL_A_PSE_ID,			/* u32 */

 	/* add new constants above here */
 	__ETHTOOL_A_PSE_CNT,
diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c
index a0705edca22a..5edb8b0a669e 100644
--- a/net/ethtool/pse-pd.c
+++ b/net/ethtool/pse-pd.c
@@ -83,6 +83,7 @@ static int pse_reply_size(const struct ethnl_req_info *req_base,
 	const struct pse_control_status *st = &data->status;
 	int len = 0;

+	len += nla_total_size(sizeof(u32)); /* _PSE_ID */
 	if (st->podl_admin_state > 0)
 		len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */
 	if (st->podl_pw_status > 0)
@@ -148,6 +149,9 @@ static int pse_fill_reply(struct sk_buff *skb,
 	const struct pse_reply_data *data = PSE_REPDATA(reply_base);
 	const struct pse_control_status *st = &data->status;

+	if (nla_put_u32(skb, ETHTOOL_A_PSE_ID, st->pse_id))
+		return -EMSGSIZE;
+
 	if (st->podl_admin_state > 0 &&
 	    nla_put_u32(skb, ETHTOOL_A_PODL_PSE_ADMIN_STATE,
 			st->podl_admin_state))

-- 
2.34.1