netdev - [patch net-next 10/10] devlink: have genetlink code to parse the attrs during dumpit

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Date:   Sat,  5 Oct 2019 20:04:42 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jakub.kicinski@...ronome.com,
        alex.aring@...il.com, stefan@...enfreihafen.org,
        jon.maloy@...csson.com, ying.xue@...driver.com,
        johannes.berg@...el.com, mkubecek@...e.cz, yuehaibing@...wei.com,
        mlxsw@...lanox.com
Subject: [patch net-next 10/10] devlink: have genetlink code to parse the attrs during dumpit

From: Jiri Pirko <jiri@...lanox.com>

Benefit from the fact that the generic netlink code can parse the attrs
for dumpit op and avoid need to parse it in the op callback.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 net/core/devlink.c | 38 ++++++--------------------------------
 1 file changed, 6 insertions(+), 32 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 6d16908f34b0..ae07ddb65f34 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3935,29 +3935,19 @@ static int devlink_nl_region_read_snapshot_fill(struct sk_buff *skb,
 static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 					     struct netlink_callback *cb)
 {
+	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 	u64 ret_offset, start_offset, end_offset = 0;
+	struct nlattr **attrs = info->attrs;
 	struct devlink_region *region;
 	struct nlattr *chunks_attr;
 	const char *region_name;
 	struct devlink *devlink;
-	struct nlattr **attrs;
 	bool dump = true;
 	void *hdr;
 	int err;
 
 	start_offset = *((u64 *)&cb->args[0]);
 
-	attrs = kmalloc_array(DEVLINK_ATTR_MAX + 1, sizeof(*attrs), GFP_KERNEL);
-	if (!attrs)
-		return -ENOMEM;
-
-	err = nlmsg_parse_deprecated(cb->nlh,
-				     GENL_HDRLEN + devlink_nl_family.hdrsize,
-				     attrs, DEVLINK_ATTR_MAX,
-				     devlink_nl_family.policy, cb->extack);
-	if (err)
-		goto out_free;
-
 	mutex_lock(&devlink_mutex);
 	devlink = devlink_get_from_attrs(sock_net(cb->skb->sk), attrs);
 	if (IS_ERR(devlink)) {
@@ -4034,7 +4024,6 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 	genlmsg_end(skb, hdr);
 	mutex_unlock(&devlink->lock);
 	mutex_unlock(&devlink_mutex);
-	kfree(attrs);
 
 	return skb->len;
 
@@ -4044,8 +4033,6 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 	mutex_unlock(&devlink->lock);
 out_dev:
 	mutex_unlock(&devlink_mutex);
-out_free:
-	kfree(attrs);
 	return err;
 }
 
@@ -4987,21 +4974,10 @@ devlink_health_reporter_get_from_info(struct devlink *devlink,
 static struct devlink_health_reporter *
 devlink_health_reporter_get_from_cb(struct netlink_callback *cb)
 {
+	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 	struct devlink_health_reporter *reporter;
+	struct nlattr **attrs = info->attrs;
 	struct devlink *devlink;
-	struct nlattr **attrs;
-	int err;
-
-	attrs = kmalloc_array(DEVLINK_ATTR_MAX + 1, sizeof(*attrs), GFP_KERNEL);
-	if (!attrs)
-		return NULL;
-
-	err = nlmsg_parse_deprecated(cb->nlh,
-				     GENL_HDRLEN + devlink_nl_family.hdrsize,
-				     attrs, DEVLINK_ATTR_MAX,
-				     devlink_nl_family.policy, cb->extack);
-	if (err)
-		goto free;
 
 	mutex_lock(&devlink_mutex);
 	devlink = devlink_get_from_attrs(sock_net(cb->skb->sk), attrs);
@@ -5010,12 +4986,9 @@ devlink_health_reporter_get_from_cb(struct netlink_callback *cb)
 
 	reporter = devlink_health_reporter_get_from_attrs(devlink, attrs);
 	mutex_unlock(&devlink_mutex);
-	kfree(attrs);
 	return reporter;
 unlock:
 	mutex_unlock(&devlink_mutex);
-free:
-	kfree(attrs);
 	return NULL;
 }
 
@@ -6146,7 +6119,8 @@ static const struct genl_ops devlink_nl_ops[] = {
 	},
 	{
 		.cmd = DEVLINK_CMD_REGION_READ,
-		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.validate = GENL_DONT_VALIDATE_STRICT |
+			    GENL_DONT_VALIDATE_DUMP_STRICT,
 		.dumpit = devlink_nl_cmd_region_read_dumpit,
 		.flags = GENL_ADMIN_PERM,
 		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
-- 
2.21.0