From: Fernando Fernandez Mancera <ffmancera@riseup.net>
Date: Wed, 5 May 2021 00:47:14 +0200
Subject: ethtool: fix missing NLM_F_MULTI flag when dumping
Patch-mainline: v5.13-rc1
Git-commit: cf754ae331be7cc192b951756a1dd031e9ed978a
References: bsc#1176447

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: 365f9ae4ee36 ("ethtool: fix genlmsg_put() failure handling in ethnl_default_dumpit()")
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/ethtool/netlink.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -389,7 +389,8 @@ static int ethnl_default_dump_one(struct
 	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;