diff mbox series

[v1,net-next,05/13] rtnetlink: Move rtnl_link_ops_get() and retry to rtnl_newlink().

Message ID 20241009231656.57830-6-kuniyu@amazon.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series rtnetlink: Refactor rtnl_{new,del,set}link() for per-netns RTNL. | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 6 this patch: 6
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 4 of 4 maintainers
netdev/build_clang success Errors and warnings before: 6 this patch: 6
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 5 this patch: 5
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 84 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 6 this patch: 6
netdev/source_inline success Was 0 now: 0

Commit Message

Kuniyuki Iwashima Oct. 9, 2024, 11:16 p.m. UTC 
Currently, if neither dev nor rtnl_link_ops is found in __rtnl_newlink(),
we release RTNL and redo the whole process after request_module(), which
complicates the logic.

The ops will be RTNL-independent later.

Let's move the ops lookup to rtnl_newlink() and do the retry earlier.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 net/core/rtnetlink.c | 42 ++++++++++++++++++------------------------
 1 file changed, 18 insertions(+), 24 deletions(-)
diff mbox series

Patch

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 3416f364db83..fe36d584136f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3689,23 +3689,19 @@  static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
 }
 
 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
+			  const struct rtnl_link_ops *ops,
 			  struct rtnl_newlink_tbs *tbs,
 			  struct netlink_ext_ack *extack)
 {
 	struct nlattr ** const linkinfo = tbs->linkinfo;
 	struct nlattr ** const tb = tbs->tb;
 	struct net *net = sock_net(skb->sk);
-	const struct rtnl_link_ops *ops;
-	char kind[MODULE_NAME_LEN];
 	struct net_device *dev;
 	struct ifinfomsg *ifm;
 	struct nlattr **data;
 	bool link_specified;
 	int err;
 
-#ifdef CONFIG_MODULES
-replay:
-#endif
 	ifm = nlmsg_data(nlh);
 	if (ifm->ifi_index > 0) {
 		link_specified = true;
@@ -3721,14 +3717,6 @@  static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 		dev = NULL;
 	}
 
-	if (linkinfo[IFLA_INFO_KIND]) {
-		nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
-		ops = rtnl_link_ops_get(kind);
-	} else {
-		kind[0] = '\0';
-		ops = NULL;
-	}
-
 	data = NULL;
 	if (ops) {
 		if (ops->maxtype > RTNL_MAX_TYPE)
@@ -3769,16 +3757,6 @@  static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 
 	if (!ops) {
-#ifdef CONFIG_MODULES
-		if (kind[0]) {
-			__rtnl_unlock();
-			request_module("rtnl-link-%s", kind);
-			rtnl_lock();
-			ops = rtnl_link_ops_get(kind);
-			if (ops)
-				goto replay;
-		}
-#endif
 		NL_SET_ERR_MSG(extack, "Unknown device type");
 		return -EOPNOTSUPP;
 	}
@@ -3789,6 +3767,7 @@  static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 			struct netlink_ext_ack *extack)
 {
+	const struct rtnl_link_ops *ops = NULL;
 	struct nlattr **tb, **linkinfo;
 	struct rtnl_newlink_tbs *tbs;
 	int ret;
@@ -3818,7 +3797,22 @@  static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 		memset(linkinfo, 0, sizeof(tbs->linkinfo));
 	}
 
-	ret = __rtnl_newlink(skb, nlh, tbs, extack);
+	if (linkinfo[IFLA_INFO_KIND]) {
+		char kind[MODULE_NAME_LEN];
+
+		nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
+		ops = rtnl_link_ops_get(kind);
+#ifdef CONFIG_MODULES
+		if (!ops) {
+			__rtnl_unlock();
+			request_module("rtnl-link-%s", kind);
+			rtnl_lock();
+			ops = rtnl_link_ops_get(kind);
+		}
+#endif
+	}
+
+	ret = __rtnl_newlink(skb, nlh, ops, tbs, extack);
 
 free:
 	kfree(tbs);