devlink: report extended error message in region_read_dumpit()

Report extended error details in the devlink_nl_cmd_region_read_dumpit()
function, by using the extack structure from the netlink_callback.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 6ef9974..fee6928 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -6507,10 +6507,10 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 {
        const struct genl_dumpit_info *info = genl_dumpit_info(cb);
        u64 ret_offset, start_offset, end_offset = U64_MAX;
+       struct nlattr *chunks_attr, *region_attr;
        struct nlattr **attrs = info->attrs;
        struct devlink_port *port = NULL;
        struct devlink_region *region;
-       struct nlattr *chunks_attr;
        const char *region_name;
        struct devlink *devlink;
        unsigned int index;
@@ -6525,8 +6525,14 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 
        devl_lock(devlink);
 
-       if (!attrs[DEVLINK_ATTR_REGION_NAME] ||
-           !attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]) {
+       if (!attrs[DEVLINK_ATTR_REGION_NAME]) {
+               NL_SET_ERR_MSG(cb->extack, "No region name provided");
+               err = -EINVAL;
+               goto out_unlock;
+       }
+
+       if (!attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]) {
+               NL_SET_ERR_MSG(cb->extack, "No snapshot id provided");
                err = -EINVAL;
                goto out_unlock;
        }
@@ -6541,7 +6547,8 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
                }
        }
 
-       region_name = nla_data(attrs[DEVLINK_ATTR_REGION_NAME]);
+       region_attr = attrs[DEVLINK_ATTR_REGION_NAME];
+       region_name = nla_data(region_attr);
 
        if (port)
                region = devlink_port_region_get_by_name(port, region_name);
@@ -6549,6 +6556,7 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
                region = devlink_region_get_by_name(devlink, region_name);
 
        if (!region) {
+               NL_SET_ERR_MSG_ATTR(cb->extack, region_attr, "Requested region does not exist");
                err = -EINVAL;
                goto out_unlock;
        }