Using a spinlock in the VLAN action causes performance issues when the VLAN
action is used on multiple cores. Rewrote the VLAN action to use RCU read
locking for reads and updates instead.
Fixed nxp flower action to use VLAN helper functions instead of accessing the
structure directly (build break error).
Acked-by: Jamal Hadi Salim
Acked-by: Jiri Pirko
Signed-off-by: Manish Kurup
---
drivers/net/ethernet/netronome/nfp/flower/action.c | 5 +-
include/net/tc_act/tc_vlan.h | 46 ---
net/sched/act_vlan.c | 65 ++
3 files changed, 80 insertions(+), 36 deletions(-)
diff --git a/drivers/net/ethernet/netronome/nfp/flower/action.c
b/drivers/net/ethernet/netronome/nfp/flower/action.c
index 0a5fc9f..cbaa8ea 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/action.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/action.c
@@ -58,7 +58,6 @@ nfp_fl_push_vlan(struct nfp_fl_push_vlan *push_vlan,
const struct tc_action *action)
{
size_t act_size = sizeof(struct nfp_fl_push_vlan);
- struct tcf_vlan *vlan = to_vlan(action);
u16 tmp_push_vlan_tci;
push_vlan->head.jump_id = NFP_FL_ACTION_OPCODE_PUSH_VLAN;
@@ -67,8 +66,8 @@ nfp_fl_push_vlan(struct nfp_fl_push_vlan *push_vlan,
push_vlan->vlan_tpid = tcf_vlan_push_proto(action);
tmp_push_vlan_tci =
- FIELD_PREP(NFP_FL_PUSH_VLAN_PRIO, vlan->tcfv_push_prio) |
- FIELD_PREP(NFP_FL_PUSH_VLAN_VID, vlan->tcfv_push_vid) |
+ FIELD_PREP(NFP_FL_PUSH_VLAN_PRIO, tcf_vlan_push_prio(action)) |
+ FIELD_PREP(NFP_FL_PUSH_VLAN_VID, tcf_vlan_push_vid(action)) |
NFP_FL_PUSH_VLAN_CFI;
push_vlan->vlan_tci = cpu_to_be16(tmp_push_vlan_tci);
}
diff --git a/include/net/tc_act/tc_vlan.h b/include/net/tc_act/tc_vlan.h
index c2090df..22ae260 100644
--- a/include/net/tc_act/tc_vlan.h
+++ b/include/net/tc_act/tc_vlan.h
@@ -13,12 +13,17 @@
#include
#include
+struct tcf_vlan_params {
+ int tcfv_action;
+ u16 tcfv_push_vid;
+ __be16tcfv_push_proto;
+ u8tcfv_push_prio;
+ struct rcu_head rcu;
+};
+
struct tcf_vlan {
struct tc_actioncommon;
- int tcfv_action;
- u16 tcfv_push_vid;
- __be16 tcfv_push_proto;
- u8 tcfv_push_prio;
+ struct tcf_vlan_params __rcu *vlan_p;
};
#define to_vlan(a) ((struct tcf_vlan *)a)
@@ -33,22 +38,45 @@ static inline bool is_tcf_vlan(const struct tc_action *a)
static inline u32 tcf_vlan_action(const struct tc_action *a)
{
- return to_vlan(a)->tcfv_action;
+ u32 tcfv_action;
+
+ rcu_read_lock();
+ tcfv_action = rcu_dereference(to_vlan(a)->vlan_p)->tcfv_action;
+ rcu_read_unlock();
+
+ return tcfv_action;
}
static inline u16 tcf_vlan_push_vid(const struct tc_action *a)
{
- return to_vlan(a)->tcfv_push_vid;
+ u16 tcfv_push_vid;
+
+ rcu_read_lock();
+ tcfv_push_vid = rcu_dereference(to_vlan(a)->vlan_p)->tcfv_push_vid;
+ rcu_read_unlock();
+
+ return tcfv_push_vid;
}
static inline __be16 tcf_vlan_push_proto(const struct tc_action *a)
{
- return to_vlan(a)->tcfv_push_proto;
+ __be16 tcfv_push_proto;
+
+ rcu_read_lock();
+ tcfv_push_proto = rcu_dereference(to_vlan(a)->vlan_p)->tcfv_push_proto;
+ rcu_read_unlock();
+
+ return tcfv_push_proto;
}
static inline u8 tcf_vlan_push_prio(const struct tc_action *a)
{
- return to_vlan(a)->tcfv_push_prio;
-}
+ u8 tcfv_push_prio;
+ rcu_read_lock();
+ tcfv_push_prio = rcu_dereference(to_vlan(a)->vlan_p)->tcfv_push_prio;
+ rcu_read_unlock();
+
+ return tcfv_push_prio;
+}
#endif /* __NET_TC_VLAN_H */
diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
index b093bad..7f461f9 100644
--- a/net/sched/act_vlan.c
+++ b/net/sched/act_vlan.c
@@ -26,6 +26,7 @@ static int tcf_vlan(struct sk_buff *skb, const struct
tc_action *a,
struct tcf_result *res)
{
struct tcf_vlan *v = to_vlan(a);
+ struct tcf_vlan_params *p;
int action;
int err;
u16 tci;
@@ -33,24 +34,27 @@ static int tcf_vlan(struct sk_buff *skb, const struct
tc_action *a,
tcf_lastuse_update(>tcf_tm);
bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb);
- spin_lock(>tcf_lock);
- action = v->tcf_action;
-
/* Ensure 'data' points at mac_header prior calling vlan manipulating
* functions.
*/
if (skb_at_tc_ingress(skb))
skb_push_rcsum(skb, skb->mac_len);
- switch (v->tcfv_action) {
+ rcu_read_lock();
+
+ action = READ_ONCE(v->tcf_action);
+
+ p =