linux-kernel - [PATCH net-next v4 24/24] net: validate driver supports passed qcfg params

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Message-ID: <bc5737ba2a1e5586408cd0398b2db0f218ed3e89.1760364551.git.asml.silence@gmail.com>
Date: Mon, 13 Oct 2025 15:54:26 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	davem@...emloft.net,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Donald Hunter <donald.hunter@...il.com>,
	Michael Chan <michael.chan@...adcom.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Joshua Washington <joshwash@...gle.com>,
	Harshitha Ramamurthy <hramamurthy@...gle.com>,
	Jian Shen <shenjian15@...wei.com>,
	Salil Mehta <salil.mehta@...wei.com>,
	Jijie Shao <shaojijie@...wei.com>,
	Sunil Goutham <sgoutham@...vell.com>,
	Geetha sowjanya <gakula@...vell.com>,
	Subbaraya Sundeep <sbhatta@...vell.com>,
	hariprasad <hkelam@...vell.com>,
	Bharat Bhushan <bbhushan2@...vell.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>,
	Mark Bloch <mbloch@...dia.com>,
	Leon Romanovsky <leon@...nel.org>,
	Alexander Duyck <alexanderduyck@...com>,
	kernel-team@...a.com,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Joe Damato <joe@...a.to>,
	David Wei <dw@...idwei.uk>,
	Willem de Bruijn <willemb@...gle.com>,
	Mina Almasry <almasrymina@...gle.com>,
	Pavel Begunkov <asml.silence@...il.com>,
	Breno Leitao <leitao@...ian.org>,
	Dragos Tatulea <dtatulea@...dia.com>,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	Jonathan Corbet <corbet@....net>
Subject: [PATCH net-next v4 24/24] net: validate driver supports passed qcfg params

When we pass a qcfg to a driver, make sure it supports the set
parameters by checking it against ->supported_ring_params.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 net/core/dev.h             |  3 +++
 net/core/netdev_config.c   | 26 ++++++++++++++++++++++++++
 net/core/netdev_rx_queue.c |  8 +++-----
 3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/net/core/dev.h b/net/core/dev.h
index 63192dbb1895..96eae1c51328 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -103,6 +103,9 @@ int netdev_queue_config_revalidate(struct net_device *dev,
 				   struct netlink_ext_ack *extack);
 void netdev_queue_config_update_cnt(struct net_device *dev, unsigned int txq,
 				    unsigned int rxq);
+int netdev_queue_config_validate(struct net_device *dev, int rxq_idx,
+				 struct netdev_queue_config *qcfg,
+				 struct netlink_ext_ack *extack);
 
 /* netdev management, shared between various uAPI entry points */
 struct netdev_name_node {
diff --git a/net/core/netdev_config.c b/net/core/netdev_config.c
index 2c9b06f94e01..99e64d942d44 100644
--- a/net/core/netdev_config.c
+++ b/net/core/netdev_config.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
 #include <linux/netdevice.h>
+#include <linux/ethtool.h>
 #include <net/netdev_queues.h>
 #include <net/netdev_rx_queue.h>
 
@@ -136,6 +137,31 @@ void netdev_queue_config(struct net_device *dev, int rxq,
 }
 EXPORT_SYMBOL(netdev_queue_config);
 
+int netdev_queue_config_validate(struct net_device *dev, int rxq_idx,
+				 struct netdev_queue_config *qcfg,
+				 struct netlink_ext_ack *extack)
+{
+	const struct netdev_queue_mgmt_ops *qops = dev->queue_mgmt_ops;
+	int err;
+
+	if (WARN_ON_ONCE(!qops))
+		return -EINVAL;
+
+	if (!(qops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN) &&
+	    qcfg->rx_buf_len &&
+	    qcfg->rx_buf_len != dev->cfg_pending->rx_buf_len) {
+		NL_SET_ERR_MSG_MOD(extack, "changing rx-buf-len not supported");
+		return -EINVAL;
+	}
+
+	if (qops->ndo_queue_cfg_validate) {
+		err = qops->ndo_queue_cfg_validate(dev, rxq_idx, qcfg, extack);
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
 int netdev_queue_config_revalidate(struct net_device *dev,
 				   struct netlink_ext_ack *extack)
 {
diff --git a/net/core/netdev_rx_queue.c b/net/core/netdev_rx_queue.c
index 5ae375a072a1..a157964cf60d 100644
--- a/net/core/netdev_rx_queue.c
+++ b/net/core/netdev_rx_queue.c
@@ -46,11 +46,9 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx,
 
 	netdev_queue_config(dev, rxq_idx, &qcfg);
 
-	if (qops->ndo_queue_cfg_validate) {
-		err = qops->ndo_queue_cfg_validate(dev, rxq_idx, &qcfg, extack);
-		if (err)
-			goto err_free_old_mem;
-	}
+	err = netdev_queue_config_validate(dev, rxq_idx, &qcfg, extack);
+	if (err)
+		goto err_free_old_mem;
 
 	err = qops->ndo_queue_mem_alloc(dev, &qcfg, new_mem, rxq_idx);
 	if (err)
-- 
2.49.0