netdev - [PATCH 6/8] net: ethtool: Add new power limit get and set features

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Message-Id: <20240529-feature_poe_power_cap-v1-6-0c4b1d5953b8@bootlin.com>
Date: Wed, 29 May 2024 16:09:33 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Donald Hunter <donald.hunter@...il.com>, 
 Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 Dent Project <dentproject@...uxfoundation.org>, kernel@...gutronix.de, 
 Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH 6/8] net: ethtool: Add new power limit get and set features

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

This patch expands the status information provided by ethtool for PSE c33
with power limit. It also adds a call to pse_ethtool_set_pw_limit() to
configure the PSE control power limit.

Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
 include/uapi/linux/ethtool_netlink.h |  1 +
 net/ethtool/pse-pd.c                 | 41 ++++++++++++++++++++++++++++++------
 2 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index c3f288b737e6..2b8c76278b9f 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -918,6 +918,7 @@ enum {
 	ETHTOOL_A_C33_PSE_PW_STATUS_MSG,	/* binary */
 	ETHTOOL_A_C33_PSE_PW_CLASS,		/* u32 */
 	ETHTOOL_A_C33_PSE_ACTUAL_PW,		/* u32 */
+	ETHTOOL_A_C33_PSE_PW_LIMIT,		/* 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 faddc14efbea..dbd75eeae4eb 100644
--- a/net/ethtool/pse-pd.c
+++ b/net/ethtool/pse-pd.c
@@ -93,6 +93,8 @@ static int pse_reply_size(const struct ethnl_req_info *req_base,
 	if (st->c33_pw_status_msg)
 		/* _C33_PSE_PW_STATUS_MSG */
 		len += nla_total_size(strlen(st->c33_pw_status_msg) + 1);
+	if (st->c33_pw_limit > 0)
+		len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_LIMIT */
 
 	return len;
 }
@@ -139,6 +141,11 @@ static int pse_fill_reply(struct sk_buff *skb,
 			   st->c33_pw_status_msg))
 		return -EMSGSIZE;
 
+	if (st->c33_pw_limit > 0 &&
+	    nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_LIMIT,
+			st->c33_pw_limit))
+		return -EMSGSIZE;
+
 	return 0;
 }
 
@@ -152,6 +159,7 @@ const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
 	[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] =
 		NLA_POLICY_RANGE(NLA_U32, ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
 				 ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED),
+	[ETHTOOL_A_C33_PSE_PW_LIMIT] = { .type = NLA_U32 },
 };
 
 static int
@@ -194,19 +202,38 @@ static int
 ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
 {
 	struct net_device *dev = req_info->dev;
-	struct pse_control_config config = {};
 	struct nlattr **tb = info->attrs;
 	struct phy_device *phydev;
+	int ret = 0;
 
 	phydev = dev->phydev;
+
+	if (tb[ETHTOOL_A_C33_PSE_PW_LIMIT]) {
+		unsigned int pw_limit = nla_get_u32(tb[ETHTOOL_A_C33_PSE_PW_LIMIT]);
+
+		ret = pse_ethtool_set_pw_limit(phydev->psec, info->extack,
+					       pw_limit);
+		if (ret)
+			return ret;
+	}
+
 	/* These values are already validated by the ethnl_pse_set_policy */
-	if (pse_has_podl(phydev->psec))
-		config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
-	if (pse_has_c33(phydev->psec))
-		config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
+	if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] ||
+	    tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]) {
+		struct pse_control_config config = {};
+
+		if (pse_has_podl(phydev->psec))
+			config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
+		if (pse_has_c33(phydev->psec))
+			config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
+
+		ret = pse_ethtool_set_config(phydev->psec, info->extack,
+					     &config);
+		if (ret)
+			return ret;
+	}
 
-	/* Return errno directly - PSE has no notification */
-	return pse_ethtool_set_config(phydev->psec, info->extack, &config);
+	return ret;
 }
 
 const struct ethnl_request_ops ethnl_pse_request_ops = {

-- 
2.34.1