In order to remove dependency on rtnl lock when calling hardware offload
API, take reference to action mirred dev when initializing flow_action
structure in tc_setup_flow_action(). Implement function
tc_cleanup_flow_action(), use it to release the device after hardware
offload API is done using it.
Signed-off-by: Vlad Buslov <vla...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
---
include/net/pkt_cls.h | 2 ++
net/sched/cls_api.c | 32 ++++++++++++++++++++++++++++++++
net/sched/cls_flower.c | 2 ++
3 files changed, 36 insertions(+)
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 4d861426507c..b20017793952 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -505,6 +505,8 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
int tc_setup_flow_action(struct flow_action *flow_action,
const struct tcf_exts *exts, bool rtnl_held);
+void tc_cleanup_flow_action(struct flow_action *flow_action);
+
int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
void *type_data, bool err_stop, bool rtnl_held);
int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 31680493b2b1..96adbff9e845 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -3244,6 +3244,27 @@ int tc_setup_cb_destroy(struct tcf_block *block, struct
tcf_proto *tp,
}
EXPORT_SYMBOL(tc_setup_cb_destroy);
+void tc_cleanup_flow_action(struct flow_action *flow_action)
+{
+ struct flow_action_entry *entry;
+ int i;
+
+ flow_action_for_each(i, entry, flow_action) {
+ switch (entry->id) {
+ case FLOW_ACTION_REDIRECT:
+ case FLOW_ACTION_MIRRED:
+ case FLOW_ACTION_REDIRECT_INGRESS:
+ case FLOW_ACTION_MIRRED_INGRESS:
+ if (entry->dev)
+ dev_put(entry->dev);
+ break;
+ default:
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL(tc_cleanup_flow_action);
+
int tc_setup_flow_action(struct flow_action *flow_action,
const struct tcf_exts *exts, bool rtnl_held)
{
@@ -3273,15 +3294,23 @@ int tc_setup_flow_action(struct flow_action
*flow_action,
} else if (is_tcf_mirred_egress_redirect(act)) {
entry->id = FLOW_ACTION_REDIRECT;
entry->dev = tcf_mirred_dev(act);
+ if (entry->dev)
+ dev_hold(entry->dev);
} else if (is_tcf_mirred_egress_mirror(act)) {
entry->id = FLOW_ACTION_MIRRED;
entry->dev = tcf_mirred_dev(act);
+ if (entry->dev)
+ dev_hold(entry->dev);
} else if (is_tcf_mirred_ingress_redirect(act)) {
entry->id = FLOW_ACTION_REDIRECT_INGRESS;
entry->dev = tcf_mirred_dev(act);
+ if (entry->dev)
+ dev_hold(entry->dev);
} else if (is_tcf_mirred_ingress_mirror(act)) {
entry->id = FLOW_ACTION_MIRRED_INGRESS;
entry->dev = tcf_mirred_dev(act);
+ if (entry->dev)
+ dev_hold(entry->dev);
} else if (is_tcf_vlan(act)) {
switch (tcf_vlan_action(act)) {
case TCA_VLAN_ACT_PUSH:
@@ -3389,6 +3418,9 @@ int tc_setup_flow_action(struct flow_action *flow_action,
if (!rtnl_held)
rtnl_unlock();
+ if (err)
+ tc_cleanup_flow_action(flow_action);
+
return err;
}
EXPORT_SYMBOL(tc_setup_flow_action);
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 006759b9c78a..1cc68702f93d 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -465,6 +465,7 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
err = tc_setup_cb_add(block, tp, TC_SETUP_CLSFLOWER, &cls_flower,
skip_sw, &f->flags, &f->in_hw_count, true);
+ tc_cleanup_flow_action(&cls_flower.rule->action);
kfree(cls_flower.rule);
if (err < 0) {
@@ -1837,6 +1838,7 @@ static int fl_reoffload(struct tcf_proto *tp, bool add,
flow_setup_cb_t *cb,
cls_flower.classid = f->res.classid;
err = cb(TC_SETUP_CLSFLOWER, &cls_flower, cb_priv);
+ tc_cleanup_flow_action(&cls_flower.rule->action);
kfree(cls_flower.rule);
if (err) {
--
2.21.0
