[net-next,v1,3/5] net: sched: sch_red: Split init and change callbacks

Message ID 853342868eb857c1e4af0caebe0aca8ec83cdfd0.1593209494.git.petrm@mellanox.com
State Superseded
Headers show
Series
  • [net-next,v1,1/5] net: sched: Pass root lock to Qdisc_ops.enqueue
Related show

Commit Message

Petr Machata June 26, 2020, 10:45 p.m.
In the following patches, RED will get two qevents. The implementation will
be clearer if the callback for change is not a pure subset of the callback
for init. Split the two and promote attribute parsing to the callbacks
themselves from the common code, because it will be handy there.

Signed-off-by: Petr Machata <petrm@mellanox.com>
---
 net/sched/sch_red.c | 42 ++++++++++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 12 deletions(-)

Patch

diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 6ace7d757e8b..225ce370e5a8 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -215,12 +215,11 @@  static const struct nla_policy red_policy[TCA_RED_MAX + 1] = {
 	[TCA_RED_FLAGS] = NLA_POLICY_BITFIELD32(TC_RED_SUPPORTED_FLAGS),
 };
 
-static int red_change(struct Qdisc *sch, struct nlattr *opt,
-		      struct netlink_ext_ack *extack)
+static int __red_change(struct Qdisc *sch, struct nlattr **tb,
+			struct netlink_ext_ack *extack)
 {
 	struct Qdisc *old_child = NULL, *child = NULL;
 	struct red_sched_data *q = qdisc_priv(sch);
-	struct nlattr *tb[TCA_RED_MAX + 1];
 	struct nla_bitfield32 flags_bf;
 	struct tc_red_qopt *ctl;
 	unsigned char userbits;
@@ -228,14 +227,6 @@  static int red_change(struct Qdisc *sch, struct nlattr *opt,
 	int err;
 	u32 max_P;
 
-	if (opt == NULL)
-		return -EINVAL;
-
-	err = nla_parse_nested_deprecated(tb, TCA_RED_MAX, opt, red_policy,
-					  NULL);
-	if (err < 0)
-		return err;
-
 	if (tb[TCA_RED_PARMS] == NULL ||
 	    tb[TCA_RED_STAB] == NULL)
 		return -EINVAL;
@@ -323,11 +314,38 @@  static int red_init(struct Qdisc *sch, struct nlattr *opt,
 		    struct netlink_ext_ack *extack)
 {
 	struct red_sched_data *q = qdisc_priv(sch);
+	struct nlattr *tb[TCA_RED_MAX + 1];
+	int err;
+
+	if (!opt)
+		return -EINVAL;
+
+	err = nla_parse_nested_deprecated(tb, TCA_RED_MAX, opt, red_policy,
+					  extack);
+	if (err < 0)
+		return err;
 
 	q->qdisc = &noop_qdisc;
 	q->sch = sch;
 	timer_setup(&q->adapt_timer, red_adaptative_timer, 0);
-	return red_change(sch, opt, extack);
+	return __red_change(sch, tb, extack);
+}
+
+static int red_change(struct Qdisc *sch, struct nlattr *opt,
+		      struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[TCA_RED_MAX + 1];
+	int err;
+
+	if (!opt)
+		return -EINVAL;
+
+	err = nla_parse_nested_deprecated(tb, TCA_RED_MAX, opt, red_policy,
+					  extack);
+	if (err < 0)
+		return err;
+
+	return __red_change(sch, tb, extack);
 }
 
 static int red_dump_offload_stats(struct Qdisc *sch)