netdev - [PATCH net-next 1/2] rtnetlink: change rtnl_stats

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Message-ID: <20240502113748.1622637-2-edumazet@google.com>
Date: Thu,  2 May 2024 11:37:47 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Ido Schimmel <idosch@...dia.com>, Jiri Pirko <jiri@...dia.com>, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 1/2] rtnetlink: change rtnl_stats_dump() return value

By returning 0 (or an error) instead of skb->len,
we allow NLMSG_DONE to be appended to the current
skb at the end of a dump, saving a couple of recvmsg()
system calls.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 283e42f48af68504af193ed5763d4e0fcd667d99..88980c8bcf334079e2d19cbcfb3f10fc05e3c19b 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -6024,7 +6024,7 @@ static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	cb->args[1] = idx;
 	cb->args[0] = h;
 
-	return skb->len;
+	return err;
 }
 
 void rtnl_offload_xstats_notify(struct net_device *dev)
-- 
2.45.0.rc0.197.gbae5840b3b-goog