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Message-ID: <247a04527829dcc9e7a6e580b3cd5fe4745c9e84.1760364551.git.asml.silence@gmail.com>
Date: Mon, 13 Oct 2025 15:54:13 +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 11/24] net: move netdev_config manipulation to dedicated helpers
From: Jakub Kicinski <kuba@...nel.org>
netdev_config manipulation will become slightly more complicated
soon and we will need to call if from ethtool as well as queue API.
Encapsulate the logic into helper functions.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Reviewed-by: Mina Almasry <almasrymina@...gle.com>
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
net/core/Makefile | 1 +
net/core/dev.c | 7 ++-----
net/core/dev.h | 5 +++++
net/core/netdev_config.c | 43 ++++++++++++++++++++++++++++++++++++++++
net/ethtool/netlink.c | 14 ++++++-------
5 files changed, 57 insertions(+), 13 deletions(-)
create mode 100644 net/core/netdev_config.c
diff --git a/net/core/Makefile b/net/core/Makefile
index 9ef2099c5426..9f1f08ff585f 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -21,6 +21,7 @@ obj-y += net-sysfs.o
obj-y += hotdata.o
obj-y += netdev_rx_queue.o
obj-y += netdev_queues.o
+obj-y += netdev_config.o
obj-$(CONFIG_PAGE_POOL) += page_pool.o page_pool_user.o
obj-$(CONFIG_PROC_FS) += net-procfs.o
obj-$(CONFIG_NET_PKTGEN) += pktgen.o
diff --git a/net/core/dev.c b/net/core/dev.c
index a64cef2c537e..5f92425dfdbd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -11973,10 +11973,8 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
if (!dev->ethtool)
goto free_all;
- dev->cfg = kzalloc(sizeof(*dev->cfg), GFP_KERNEL_ACCOUNT);
- if (!dev->cfg)
+ if (netdev_alloc_config(dev))
goto free_all;
- dev->cfg_pending = dev->cfg;
dev->num_napi_configs = maxqs;
napi_config_sz = array_size(maxqs, sizeof(*dev->napi_config));
@@ -12047,8 +12045,7 @@ void free_netdev(struct net_device *dev)
return;
}
- WARN_ON(dev->cfg != dev->cfg_pending);
- kfree(dev->cfg);
+ netdev_free_config(dev);
kfree(dev->ethtool);
netif_free_tx_queues(dev);
netif_free_rx_queues(dev);
diff --git a/net/core/dev.h b/net/core/dev.h
index 900880e8b5b4..1ec0b836c652 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -92,6 +92,11 @@ extern struct rw_semaphore dev_addr_sem;
extern struct list_head net_todo_list;
void netdev_run_todo(void);
+int netdev_alloc_config(struct net_device *dev);
+void __netdev_free_config(struct netdev_config *cfg);
+void netdev_free_config(struct net_device *dev);
+int netdev_reconfig_start(struct net_device *dev);
+
/* netdev management, shared between various uAPI entry points */
struct netdev_name_node {
struct hlist_node hlist;
diff --git a/net/core/netdev_config.c b/net/core/netdev_config.c
new file mode 100644
index 000000000000..270b7f10a192
--- /dev/null
+++ b/net/core/netdev_config.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/netdevice.h>
+#include <net/netdev_queues.h>
+
+#include "dev.h"
+
+int netdev_alloc_config(struct net_device *dev)
+{
+ struct netdev_config *cfg;
+
+ cfg = kzalloc(sizeof(*dev->cfg), GFP_KERNEL_ACCOUNT);
+ if (!cfg)
+ return -ENOMEM;
+
+ dev->cfg = cfg;
+ dev->cfg_pending = cfg;
+ return 0;
+}
+
+void __netdev_free_config(struct netdev_config *cfg)
+{
+ kfree(cfg);
+}
+
+void netdev_free_config(struct net_device *dev)
+{
+ WARN_ON(dev->cfg != dev->cfg_pending);
+ __netdev_free_config(dev->cfg);
+}
+
+int netdev_reconfig_start(struct net_device *dev)
+{
+ struct netdev_config *cfg;
+
+ WARN_ON(dev->cfg != dev->cfg_pending);
+ cfg = kmemdup(dev->cfg, sizeof(*dev->cfg), GFP_KERNEL_ACCOUNT);
+ if (!cfg)
+ return -ENOMEM;
+
+ dev->cfg_pending = cfg;
+ return 0;
+}
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 2f813f25f07e..d376d3043177 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -6,6 +6,7 @@
#include <linux/ethtool_netlink.h>
#include <linux/phy_link_topology.h>
#include <linux/pm_runtime.h>
+#include "../core/dev.h"
#include "netlink.h"
#include "module_fw.h"
@@ -906,12 +907,9 @@ static int ethnl_default_set_doit(struct sk_buff *skb, struct genl_info *info)
rtnl_lock();
netdev_lock_ops(dev);
- dev->cfg_pending = kmemdup(dev->cfg, sizeof(*dev->cfg),
- GFP_KERNEL_ACCOUNT);
- if (!dev->cfg_pending) {
- ret = -ENOMEM;
- goto out_tie_cfg;
- }
+ ret = netdev_reconfig_start(dev);
+ if (ret)
+ goto out_unlock;
ret = ethnl_ops_begin(dev);
if (ret < 0)
@@ -930,9 +928,9 @@ static int ethnl_default_set_doit(struct sk_buff *skb, struct genl_info *info)
out_ops:
ethnl_ops_complete(dev);
out_free_cfg:
- kfree(dev->cfg_pending);
-out_tie_cfg:
+ __netdev_free_config(dev->cfg_pending);
dev->cfg_pending = dev->cfg;
+out_unlock:
netdev_unlock_ops(dev);
rtnl_unlock();
out_dev:
--
2.49.0
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