netdev - [PATCH net] psample: Fix user API breakage

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Message-Id: <20210324194332.153658-1-idosch@idosch.org>
Date:   Wed, 24 Mar 2021 21:43:32 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, yotam.gi@...il.com,
        jiri@...dia.com, petrm@...dia.com, chrism@...lanox.com,
        sfr@...b.auug.org.au, Ido Schimmel <idosch@...dia.com>,
        stable@...r.kernel.org
Subject: [PATCH net] psample: Fix user API breakage

From: Ido Schimmel <idosch@...dia.com>

Cited commit added a new attribute before the existing group reference
count attribute, thereby changing its value and breaking existing
applications on new kernels.

Before:

 # psample -l
 libpsample ERROR psample_group_foreach: failed to recv message: Operation not supported

After:

 # psample -l
 Group Num       Refcount        Group Seq
 1               1               0

Fix by restoring the value of the old attribute and remove the
misleading comments from the enumerator to avoid future bugs.

Cc: stable@...r.kernel.org
Fixes: d8bed686ab96 ("net: psample: Add tunnel support")
Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reported-by: Adiel Bidani <adielb@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Reviewed-by: Petr Machata <petrm@...dia.com>
---
Dave, Jakub, Stephen, there might be a trivial conflict when you merge
net into net-next. If so, see resolution here:
https://github.com/jpirko/linux_mlxsw/commit/d47ac079ef169d3ab07c85e9178a925f7dffbebe.patch
---
 include/uapi/linux/psample.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/uapi/linux/psample.h b/include/uapi/linux/psample.h
index aea26ab1431c..bff5032c98df 100644
--- a/include/uapi/linux/psample.h
+++ b/include/uapi/linux/psample.h
@@ -3,7 +3,6 @@
 #define __UAPI_PSAMPLE_H
 
 enum {
-	/* sampled packet metadata */
 	PSAMPLE_ATTR_IIFINDEX,
 	PSAMPLE_ATTR_OIFINDEX,
 	PSAMPLE_ATTR_ORIGSIZE,
@@ -11,10 +10,8 @@ enum {
 	PSAMPLE_ATTR_GROUP_SEQ,
 	PSAMPLE_ATTR_SAMPLE_RATE,
 	PSAMPLE_ATTR_DATA,
-	PSAMPLE_ATTR_TUNNEL,
-
-	/* commands attributes */
 	PSAMPLE_ATTR_GROUP_REFCOUNT,
+	PSAMPLE_ATTR_TUNNEL,
 
 	__PSAMPLE_ATTR_MAX
 };
-- 
2.30.2