[PATCH net-next v2 4/7] devlink: region: snapshot IDs: consolidate error values

From: Przemek Kitszel
Date: Wed Oct 23 2024 - 09:14:40 EST


Consolidate error codes for too big message size.

Current code is written to return -EINVAL when tailroom in the skb msg
would be exhausted precisely when it's time to nest, and return -EMSGSIZE
in all other "not enough space" conditions.

Reviewed-by: Wojciech Drewek <wojciech.drewek@xxxxxxxxx>
Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxx>
Reviewed-by: Joe Damato <jdamato@xxxxxxxxxx>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@xxxxxxxxx>
---
net/devlink/region.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/devlink/region.c b/net/devlink/region.c
index 0a75a2fbd4d7..63fb297f6d67 100644
--- a/net/devlink/region.c
+++ b/net/devlink/region.c
@@ -77,7 +77,7 @@ static int devlink_nl_region_snapshot_id_put(struct sk_buff *msg,

snap_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_REGION_SNAPSHOT);
if (!snap_attr)
- return -EINVAL;
+ return -EMSGSIZE;

err = nla_put_u32(msg, DEVLINK_ATTR_REGION_SNAPSHOT_ID, snapshot->id);
if (err)
@@ -102,7 +102,7 @@ static int devlink_nl_region_snapshots_id_put(struct sk_buff *msg,
snapshots_attr = nla_nest_start_noflag(msg,
DEVLINK_ATTR_REGION_SNAPSHOTS);
if (!snapshots_attr)
- return -EINVAL;
+ return -EMSGSIZE;

list_for_each_entry(snapshot, &region->snapshot_list, list) {
err = devlink_nl_region_snapshot_id_put(msg, devlink, snapshot);
--
2.46.0