netdev - [PATCH net] ethtool: fix missing NLM_F

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Date:   Wed,  5 May 2021 00:47:14 +0200
From:   Fernando Fernandez Mancera <ffmancera@...eup.net>
To:     netdev@...r.kernel.org, mkubecek@...e.cz, atenart@...nel.org
Cc:     Fernando Fernandez Mancera <ffmancera@...eup.net>
Subject: [PATCH net] ethtool: fix missing NLM_F_MULTI flag when dumping

When dumping the ethtool information from all the interfaces, the
netlink reply should contain the NLM_F_MULTI flag. This flag allows
userspace tools to identify that multiple messages are expected.

Link: https://bugzilla.redhat.com/1953847
Fixes: 365f9ae ("ethtool: fix genlmsg_put() failure handling in ethnl_default_dumpit()")
Signed-off-by: Fernando Fernandez Mancera <ffmancera@...eup.net>
---
 net/ethtool/netlink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 290012d0d11d..88d8a0243f35 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -387,7 +387,8 @@ static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
 	int ret;
 
 	ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
-			   &ethtool_genl_family, 0, ctx->ops->reply_cmd);
+			   &ethtool_genl_family, NLM_F_MULTI,
+			   ctx->ops->reply_cmd);
 	if (!ehdr)
 		return -EMSGSIZE;
 
-- 
2.20.1