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authorMichal Kubecek <mkubecek@suse.cz>2020-09-17 01:04:10 +0200
committerDavid S. Miller <davem@davemloft.net>2020-09-17 16:43:20 -0700
commit19a83d36f9837e8bd27435ebb31564a717a5d15a (patch)
treec4a0d261409447e73c59f40160e5807b00d9ab79
parent9fb030a70431a2a2a1b292dbf0b2f399cc072c16 (diff)
downloadlinux-19a83d36f9837e8bd27435ebb31564a717a5d15a.tar.bz2
ethtool: add and use message type for tunnel info reply
Tunnel offload info code uses ETHTOOL_MSG_TUNNEL_INFO_GET message type (cmd field in genetlink header) for replies to tunnel info netlink request, i.e. the same value as the request have. This is a problem because we are using two separate enums for userspace to kernel and kernel to userspace message types so that this ETHTOOL_MSG_TUNNEL_INFO_GET (28) collides with ETHTOOL_MSG_CABLE_TEST_TDR_NTF which is what message type 28 means for kernel to userspace messages. As the tunnel info request reached mainline in 5.9 merge window, we should still be able to fix the reply message type without breaking backward compatibility. Fixes: c7d759eb7b12 ("ethtool: add tunnel info interface") Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--Documentation/networking/ethtool-netlink.rst3
-rw-r--r--include/uapi/linux/ethtool_netlink.h1
-rw-r--r--net/ethtool/tunnels.c4
3 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index d53bcb31645a..b5a79881551f 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -206,6 +206,7 @@ Userspace to kernel:
``ETHTOOL_MSG_TSINFO_GET`` get timestamping info
``ETHTOOL_MSG_CABLE_TEST_ACT`` action start cable test
``ETHTOOL_MSG_CABLE_TEST_TDR_ACT`` action start raw TDR cable test
+ ``ETHTOOL_MSG_TUNNEL_INFO_GET`` get tunnel offload info
===================================== ================================
Kernel to userspace:
@@ -239,6 +240,7 @@ Kernel to userspace:
``ETHTOOL_MSG_TSINFO_GET_REPLY`` timestamping info
``ETHTOOL_MSG_CABLE_TEST_NTF`` Cable test results
``ETHTOOL_MSG_CABLE_TEST_TDR_NTF`` Cable test TDR results
+ ``ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY`` tunnel offload info
===================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@@ -1363,4 +1365,5 @@ are netlink only.
``ETHTOOL_SFECPARAM`` n/a
n/a ''ETHTOOL_MSG_CABLE_TEST_ACT''
n/a ''ETHTOOL_MSG_CABLE_TEST_TDR_ACT''
+ n/a ``ETHTOOL_MSG_TUNNEL_INFO_GET``
=================================== =====================================
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 5dcd24cb33ea..72ba36be9655 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -79,6 +79,7 @@ enum {
ETHTOOL_MSG_TSINFO_GET_REPLY,
ETHTOOL_MSG_CABLE_TEST_NTF,
ETHTOOL_MSG_CABLE_TEST_TDR_NTF,
+ ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY,
/* add new constants above here */
__ETHTOOL_MSG_KERNEL_CNT,
diff --git a/net/ethtool/tunnels.c b/net/ethtool/tunnels.c
index 84f23289475b..d93bf2da0f34 100644
--- a/net/ethtool/tunnels.c
+++ b/net/ethtool/tunnels.c
@@ -200,7 +200,7 @@ int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
reply_len = ret + ethnl_reply_header_size();
rskb = ethnl_reply_init(reply_len, req_info.dev,
- ETHTOOL_MSG_TUNNEL_INFO_GET,
+ ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY,
ETHTOOL_A_TUNNEL_INFO_HEADER,
info, &reply_payload);
if (!rskb) {
@@ -273,7 +273,7 @@ int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
goto cont;
ehdr = ethnl_dump_put(skb, cb,
- ETHTOOL_MSG_TUNNEL_INFO_GET);
+ ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY);
if (!ehdr) {
ret = -EMSGSIZE;
goto out;