diff mbox series

[v4,net,01/12] net: add dev_net_rcu() helper

Message ID 20250205155120.1676781-2-edumazet@google.com (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series net: first round to use dev_net_rcu() | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 40 this patch: 40
netdev/build_tools success Errors and warnings before: 26 (+1) this patch: 26 (+1)
netdev/cc_maintainers warning 1 maintainers not CCed: andrew+netdev@lunn.ch
netdev/build_clang success Errors and warnings before: 7211 this patch: 7211
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 4267 this patch: 4267
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 20 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 16 this patch: 16
netdev/source_inline success Was 0 now: 0

Commit Message

Eric Dumazet Feb. 5, 2025, 3:51 p.m. UTC 
dev->nd_net can change, readers should either
use rcu_read_lock() or RTNL.

We currently use a generic helper, dev_net() with
no debugging support. We probably have many hidden bugs.

Add dev_net_rcu() helper for callers using rcu_read_lock()
protection.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 include/linux/netdevice.h   | 6 ++++++
 include/net/net_namespace.h | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 03bb584c62cf8a920b12c673dcc438eb1cc41499..c0a86afb85daa2b50e26a1ca238707a24a1842ad 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2663,6 +2663,12 @@  struct net *dev_net(const struct net_device *dev)
 	return read_pnet(&dev->nd_net);
 }
 
+static inline
+struct net *dev_net_rcu(const struct net_device *dev)
+{
+	return read_pnet_rcu(&dev->nd_net);
+}
+
 static inline
 void dev_net_set(struct net_device *dev, struct net *net)
 {
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 0f5eb9db0c6264efc1ac83ab577511fd6823f4fe..7ba1402ca7796663bed3373b1a0c6a0249cd1599 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -398,7 +398,7 @@  static inline struct net *read_pnet(const possible_net_t *pnet)
 #endif
 }
 
-static inline struct net *read_pnet_rcu(possible_net_t *pnet)
+static inline struct net *read_pnet_rcu(const possible_net_t *pnet)
 {
 #ifdef CONFIG_NET_NS
 	return rcu_dereference(pnet->net);