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authorJiri Pirko <jiri@mellanox.com>2017-11-03 11:46:24 +0100
committerDavid S. Miller <davem@davemloft.net>2017-11-03 21:57:23 +0900
commitc7eb7d7230509ec862d4144f7a831f995bc5d028 (patch)
treeb5a04d576966457b29dff194444e4aeb9fe6c5a8 /net
parentaa5fbf07541bbec0d79f4b32415aff2233971853 (diff)
downloadlinux-c7eb7d7230509ec862d4144f7a831f995bc5d028.tar.bz2
net: sched: introduce chain_head_change callback
Add a callback that is to be called whenever head of the chain changes. Also provide a callback for the default case when the caller gets a block using non-extended getter. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/cls_api.c54
-rw-r--r--net/sched/sch_ingress.c36
2 files changed, 52 insertions, 38 deletions
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 8d1885abee83..206e19f4fc01 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -195,12 +195,19 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
return chain;
}
+static void tcf_chain_head_change(struct tcf_chain *chain,
+ struct tcf_proto *tp_head)
+{
+ if (chain->chain_head_change)
+ chain->chain_head_change(tp_head,
+ chain->chain_head_change_priv);
+}
+
static void tcf_chain_flush(struct tcf_chain *chain)
{
struct tcf_proto *tp;
- if (chain->p_filter_chain)
- RCU_INIT_POINTER(*chain->p_filter_chain, NULL);
+ tcf_chain_head_change(chain, NULL);
while ((tp = rtnl_dereference(chain->filter_chain)) != NULL) {
RCU_INIT_POINTER(chain->filter_chain, tp->next);
tcf_chain_put(chain);
@@ -242,13 +249,6 @@ void tcf_chain_put(struct tcf_chain *chain)
}
EXPORT_SYMBOL(tcf_chain_put);
-static void
-tcf_chain_filter_chain_ptr_set(struct tcf_chain *chain,
- struct tcf_proto __rcu **p_filter_chain)
-{
- chain->p_filter_chain = p_filter_chain;
-}
-
static void tcf_block_offload_cmd(struct tcf_block *block, struct Qdisc *q,
struct tcf_block_ext_info *ei,
enum tc_block_command command)
@@ -276,8 +276,7 @@ static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
tcf_block_offload_cmd(block, q, ei, TC_BLOCK_UNBIND);
}
-int tcf_block_get_ext(struct tcf_block **p_block,
- struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
+int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
struct tcf_block_ext_info *ei)
{
struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL);
@@ -295,7 +294,9 @@ int tcf_block_get_ext(struct tcf_block **p_block,
err = -ENOMEM;
goto err_chain_create;
}
- tcf_chain_filter_chain_ptr_set(chain, p_filter_chain);
+ WARN_ON(!ei->chain_head_change);
+ chain->chain_head_change = ei->chain_head_change;
+ chain->chain_head_change_priv = ei->chain_head_change_priv;
block->net = qdisc_net(q);
block->q = q;
tcf_block_offload_bind(block, q, ei);
@@ -308,12 +309,23 @@ err_chain_create:
}
EXPORT_SYMBOL(tcf_block_get_ext);
+static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
+{
+ struct tcf_proto __rcu **p_filter_chain = priv;
+
+ rcu_assign_pointer(*p_filter_chain, tp_head);
+}
+
int tcf_block_get(struct tcf_block **p_block,
struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q)
{
- struct tcf_block_ext_info ei = {0, };
+ struct tcf_block_ext_info ei = {
+ .chain_head_change = tcf_chain_head_change_dflt,
+ .chain_head_change_priv = p_filter_chain,
+ };
- return tcf_block_get_ext(p_block, p_filter_chain, q, &ei);
+ WARN_ON(!p_filter_chain);
+ return tcf_block_get_ext(p_block, q, &ei);
}
EXPORT_SYMBOL(tcf_block_get);
@@ -334,8 +346,7 @@ static void tcf_block_put_final(struct work_struct *work)
* actions should be all removed after flushing. However, filters are now
* destroyed in tc filter workqueue with RTNL lock, they can not race here.
*/
-void tcf_block_put_ext(struct tcf_block *block,
- struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
+void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
struct tcf_block_ext_info *ei)
{
struct tcf_chain *chain, *tmp;
@@ -361,7 +372,7 @@ void tcf_block_put(struct tcf_block *block)
if (!block)
return;
- tcf_block_put_ext(block, NULL, block->q, &ei);
+ tcf_block_put_ext(block, block->q, &ei);
}
EXPORT_SYMBOL(tcf_block_put);
@@ -537,9 +548,8 @@ static void tcf_chain_tp_insert(struct tcf_chain *chain,
struct tcf_chain_info *chain_info,
struct tcf_proto *tp)
{
- if (chain->p_filter_chain &&
- *chain_info->pprev == chain->filter_chain)
- rcu_assign_pointer(*chain->p_filter_chain, tp);
+ if (*chain_info->pprev == chain->filter_chain)
+ tcf_chain_head_change(chain, tp);
RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
rcu_assign_pointer(*chain_info->pprev, tp);
tcf_chain_hold(chain);
@@ -551,8 +561,8 @@ static void tcf_chain_tp_remove(struct tcf_chain *chain,
{
struct tcf_proto *next = rtnl_dereference(chain_info->next);
- if (chain->p_filter_chain && tp == chain->filter_chain)
- RCU_INIT_POINTER(*chain->p_filter_chain, next);
+ if (tp == chain->filter_chain)
+ tcf_chain_head_change(chain, next);
RCU_INIT_POINTER(*chain_info->pprev, next);
tcf_chain_put(chain);
}
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index b599db26d34b..811845815b8c 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -54,6 +54,13 @@ static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl)
return q->block;
}
+static void clsact_chain_head_change(struct tcf_proto *tp_head, void *priv)
+{
+ struct tcf_proto __rcu **p_filter_chain = priv;
+
+ rcu_assign_pointer(*p_filter_chain, tp_head);
+}
+
static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
{
struct ingress_sched_data *q = qdisc_priv(sch);
@@ -61,9 +68,10 @@ static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
int err;
q->block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
+ q->block_info.chain_head_change = clsact_chain_head_change;
+ q->block_info.chain_head_change_priv = &dev->ingress_cl_list;
- err = tcf_block_get_ext(&q->block, &dev->ingress_cl_list,
- sch, &q->block_info);
+ err = tcf_block_get_ext(&q->block, sch, &q->block_info);
if (err)
return err;
@@ -76,10 +84,8 @@ static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
static void ingress_destroy(struct Qdisc *sch)
{
struct ingress_sched_data *q = qdisc_priv(sch);
- struct net_device *dev = qdisc_dev(sch);
- tcf_block_put_ext(q->block, &dev->ingress_cl_list,
- sch, &q->block_info);
+ tcf_block_put_ext(q->block, sch, &q->block_info);
net_dec_ingress_queue();
}
@@ -162,16 +168,18 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt)
int err;
q->ingress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
+ q->ingress_block_info.chain_head_change = clsact_chain_head_change;
+ q->ingress_block_info.chain_head_change_priv = &dev->ingress_cl_list;
- err = tcf_block_get_ext(&q->ingress_block, &dev->ingress_cl_list,
- sch, &q->ingress_block_info);
+ err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info);
if (err)
return err;
q->egress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS;
+ q->egress_block_info.chain_head_change = clsact_chain_head_change;
+ q->egress_block_info.chain_head_change_priv = &dev->egress_cl_list;
- err = tcf_block_get_ext(&q->egress_block, &dev->egress_cl_list,
- sch, &q->egress_block_info);
+ err = tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info);
if (err)
goto err_egress_block_get;
@@ -183,20 +191,16 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt)
return 0;
err_egress_block_get:
- tcf_block_put_ext(q->ingress_block, &dev->ingress_cl_list,
- sch, &q->ingress_block_info);
+ tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
return err;
}
static void clsact_destroy(struct Qdisc *sch)
{
struct clsact_sched_data *q = qdisc_priv(sch);
- struct net_device *dev = qdisc_dev(sch);
- tcf_block_put_ext(q->egress_block, &dev->egress_cl_list,
- sch, &q->egress_block_info);
- tcf_block_put_ext(q->ingress_block, &dev->ingress_cl_list,
- sch, &q->ingress_block_info);
+ tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);
+ tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
net_dec_ingress_queue();
net_dec_egress_queue();