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Message-ID: <20240403202259.1978707-1-kuba@kernel.org>
Date: Wed, 3 Apr 2024 13:22:59 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
Jakub Kicinski <kuba@...nel.org>,
jiri@...nulli.us
Subject: [PATCH net-next] netlink: add nlmsg_consume() and use it in devlink compat
devlink_compat_running_version() sticks out when running
netdevsim tests and watching dropped skbs. Add nlmsg_consume()
for cases were we want to free a netlink skb but it is expected,
rather than a drop. af_netlink code uses consume_skb() directly,
which is fine, but some may prefer the symmetry of nlmsg_new() /
nlmsg_consume().
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: jiri@...nulli.us
---
include/net/netlink.h | 14 ++++++++++++--
net/devlink/dev.c | 2 +-
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/include/net/netlink.h b/include/net/netlink.h
index 1d2bbcc50212..61cef3bd2d31 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -41,7 +41,8 @@
* nlmsg_get_pos() return current position in message
* nlmsg_trim() trim part of message
* nlmsg_cancel() cancel message construction
- * nlmsg_free() free a netlink message
+ * nlmsg_consume() free a netlink message (expected)
+ * nlmsg_free() free a netlink message (drop)
*
* Message Sending:
* nlmsg_multicast() multicast message to several groups
@@ -1082,7 +1083,7 @@ static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
}
/**
- * nlmsg_free - free a netlink message
+ * nlmsg_free - drop a netlink message
* @skb: socket buffer of netlink message
*/
static inline void nlmsg_free(struct sk_buff *skb)
@@ -1090,6 +1091,15 @@ static inline void nlmsg_free(struct sk_buff *skb)
kfree_skb(skb);
}
+/**
+ * nlmsg_consume - free a netlink message
+ * @skb: socket buffer of netlink message
+ */
+static inline void nlmsg_consume(struct sk_buff *skb)
+{
+ consume_skb(skb);
+}
+
/**
* nlmsg_multicast_filtered - multicast a netlink message with filter function
* @sk: netlink socket to spread messages to
diff --git a/net/devlink/dev.c b/net/devlink/dev.c
index c609deb42e88..13c73f50da3d 100644
--- a/net/devlink/dev.c
+++ b/net/devlink/dev.c
@@ -1214,7 +1214,7 @@ static void __devlink_compat_running_version(struct devlink *devlink,
}
}
free_msg:
- nlmsg_free(msg);
+ nlmsg_consume(msg);
}
void devlink_compat_running_version(struct devlink *devlink,
--
2.44.0
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