diff mbox series

[net,v2,3/5] net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode

Message ID 20230705134329.102345-4-victor@mojatatu.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net: sched: Undo tcf_bind_filter in case of errors in set callbacks | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers fail 2 blamed authors not CCed: john.r.fastabend@intel.com sridhar.samudrala@intel.com; 2 maintainers not CCed: john.r.fastabend@intel.com sridhar.samudrala@intel.com
netdev/build_clang fail Errors and warnings before: 18 this patch: 18
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 Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 72 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Victor Nogueira July 5, 2023, 1:43 p.m. UTC 
When u32_replace_hw_knode fails, we need to undo the tcf_bind_filter
operation done at u32_set_parms.

Fixes: d34e3e181395 ("net: cls_u32: Add support for skip-sw flag to tc u32 classifier.")
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
---
 net/sched/cls_u32.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index d15d50de7980..7e32c018941f 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -712,11 +712,13 @@  static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 	[TCA_U32_FLAGS]		= { .type = NLA_U32 },
 };
 
+#define U32_SET_FLAGS_BOUND 0x1
+
 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 			 unsigned long base,
 			 struct tc_u_knode *n, struct nlattr **tb,
 			 struct nlattr *est, u32 flags, u32 fl_flags,
-			 struct netlink_ext_ack *extack)
+			 u8 *set_flags, struct netlink_ext_ack *extack)
 {
 	int err, ifindex = -1;
 
@@ -763,6 +765,7 @@  static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 	if (tb[TCA_U32_CLASSID]) {
 		n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 		tcf_bind_filter(tp, &n->res, base);
+		*set_flags |= U32_SET_FLAGS_BOUND;
 	}
 
 	if (ifindex >= 0)
@@ -859,6 +862,7 @@  static int u32_change(struct net *net, struct sk_buff *in_skb,
 	struct nlattr *opt = tca[TCA_OPTIONS];
 	struct nlattr *tb[TCA_U32_MAX + 1];
 	u32 htid, userflags = 0;
+	u8 set_flags = 0;
 	size_t sel_size;
 	int err;
 
@@ -905,7 +909,7 @@  static int u32_change(struct net *net, struct sk_buff *in_skb,
 
 		err = u32_set_parms(net, tp, base, new, tb,
 				    tca[TCA_RATE], flags, new->flags,
-				    extack);
+				    &set_flags, extack);
 
 		if (err) {
 			__u32_destroy_key(new);
@@ -914,6 +918,9 @@  static int u32_change(struct net *net, struct sk_buff *in_skb,
 
 		err = u32_replace_hw_knode(tp, new, flags, extack);
 		if (err) {
+			if (set_flags & U32_SET_FLAGS_BOUND)
+				tcf_unbind_filter(tp, &new->res);
+
 			__u32_destroy_key(new);
 			return err;
 		}
@@ -1075,14 +1082,14 @@  static int u32_change(struct net *net, struct sk_buff *in_skb,
 #endif
 
 	err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE],
-			    flags, n->flags, extack);
+			    flags, n->flags, &set_flags, extack);
 	if (err == 0) {
 		struct tc_u_knode __rcu **ins;
 		struct tc_u_knode *pins;
 
 		err = u32_replace_hw_knode(tp, n, flags, extack);
 		if (err)
-			goto errhw;
+			goto errunbind;
 
 		if (!tc_in_hw(n->flags))
 			n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
@@ -1100,7 +1107,10 @@  static int u32_change(struct net *net, struct sk_buff *in_skb,
 		return 0;
 	}
 
-errhw:
+errunbind:
+	if (set_flags & U32_SET_FLAGS_BOUND)
+		tcf_unbind_filter(tp, &n->res);
+
 #ifdef CONFIG_CLS_U32_MARK
 	free_percpu(n->pcpu_success);
 #endif