net: sched: introduce per-block callbacks

Introduce infrastructure that allows drivers to register callbacks that
are called whenever tc would offload inserted rule for a specific block.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 5c50af8..4bc6b1c 100644 (file)
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -27,6 +27,8 @@ struct tcf_block_ext_info {
        enum tcf_block_binder_type binder_type;
 };
 
+struct tcf_block_cb;
+
 #ifdef CONFIG_NET_CLS
 struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
                                bool create);
@@ -51,6 +53,21 @@ static inline struct net_device *tcf_block_dev(struct tcf_block *block)
        return tcf_block_q(block)->dev_queue->dev;
 }
 
+void *tcf_block_cb_priv(struct tcf_block_cb *block_cb);
+struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
+                                        tc_setup_cb_t *cb, void *cb_ident);
+void tcf_block_cb_incref(struct tcf_block_cb *block_cb);
+unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb);
+struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
+                                            tc_setup_cb_t *cb, void *cb_ident,
+                                            void *cb_priv);
+int tcf_block_cb_register(struct tcf_block *block,
+                         tc_setup_cb_t *cb, void *cb_ident,
+                         void *cb_priv);
+void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb);
+void tcf_block_cb_unregister(struct tcf_block *block,
+                            tc_setup_cb_t *cb, void *cb_ident);
+
 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
                 struct tcf_result *res, bool compat_mode);
 
@@ -91,6 +108,70 @@ static inline struct net_device *tcf_block_dev(struct tcf_block *block)
        return NULL;
 }
 
+static inline
+int tc_setup_cb_block_register(struct tcf_block *block, tc_setup_cb_t *cb,
+                              void *cb_priv)
+{
+       return 0;
+}
+
+static inline
+void tc_setup_cb_block_unregister(struct tcf_block *block, tc_setup_cb_t *cb,
+                                 void *cb_priv)
+{
+}
+
+static inline
+void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
+{
+       return NULL;
+}
+
+static inline
+struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
+                                        tc_setup_cb_t *cb, void *cb_ident)
+{
+       return NULL;
+}
+
+static inline
+void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
+{
+}
+
+static inline
+unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
+{
+       return 0;
+}
+
+static inline
+struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
+                                            tc_setup_cb_t *cb, void *cb_ident,
+                                            void *cb_priv)
+{
+       return NULL;
+}
+
+static inline
+int tcf_block_cb_register(struct tcf_block *block,
+                         tc_setup_cb_t *cb, void *cb_ident,
+                         void *cb_priv)
+{
+       return 0;
+}
+
+static inline
+void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb)
+{
+}
+
+static inline
+void tcf_block_cb_unregister(struct tcf_block *block,
+                            tc_setup_cb_t *cb, void *cb_ident)
+{
+}
+
 static inline int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
                               struct tcf_result *res, bool compat_mode)
 {

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 0aea9e2..031dffd 100644 (file)
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -272,6 +272,7 @@ struct tcf_block {
        struct list_head chain_list;
        struct net *net;
        struct Qdisc *q;
+       struct list_head cb_list;
 };
 
 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 92dce26..b16c79c 100644 (file)
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -278,6 +278,8 @@ int tcf_block_get_ext(struct tcf_block **p_block,
        if (!block)
                return -ENOMEM;
        INIT_LIST_HEAD(&block->chain_list);
+       INIT_LIST_HEAD(&block->cb_list);
+
        /* Create chain 0 by default, it has to be always present. */
        chain = tcf_chain_create(block, 0);
        if (!chain) {
@@ -354,6 +356,109 @@ void tcf_block_put(struct tcf_block *block)
 }
 EXPORT_SYMBOL(tcf_block_put);
 
+struct tcf_block_cb {
+       struct list_head list;
+       tc_setup_cb_t *cb;
+       void *cb_ident;
+       void *cb_priv;
+       unsigned int refcnt;
+};
+
+void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
+{
+       return block_cb->cb_priv;
+}
+EXPORT_SYMBOL(tcf_block_cb_priv);
+
+struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
+                                        tc_setup_cb_t *cb, void *cb_ident)
+{      struct tcf_block_cb *block_cb;
+
+       list_for_each_entry(block_cb, &block->cb_list, list)
+               if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
+                       return block_cb;
+       return NULL;
+}
+EXPORT_SYMBOL(tcf_block_cb_lookup);
+
+void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
+{
+       block_cb->refcnt++;
+}
+EXPORT_SYMBOL(tcf_block_cb_incref);
+
+unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
+{
+       return --block_cb->refcnt;
+}
+EXPORT_SYMBOL(tcf_block_cb_decref);
+
+struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
+                                            tc_setup_cb_t *cb, void *cb_ident,
+                                            void *cb_priv)
+{
+       struct tcf_block_cb *block_cb;
+
+       block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
+       if (!block_cb)
+               return NULL;
+       block_cb->cb = cb;
+       block_cb->cb_ident = cb_ident;
+       block_cb->cb_priv = cb_priv;
+       list_add(&block_cb->list, &block->cb_list);
+       return block_cb;
+}
+EXPORT_SYMBOL(__tcf_block_cb_register);
+
+int tcf_block_cb_register(struct tcf_block *block,
+                         tc_setup_cb_t *cb, void *cb_ident,
+                         void *cb_priv)
+{
+       struct tcf_block_cb *block_cb;
+
+       block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv);
+       return block_cb ? 0 : -ENOMEM;
+}
+EXPORT_SYMBOL(tcf_block_cb_register);
+
+void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb)
+{
+       list_del(&block_cb->list);
+       kfree(block_cb);
+}
+EXPORT_SYMBOL(__tcf_block_cb_unregister);
+
+void tcf_block_cb_unregister(struct tcf_block *block,
+                            tc_setup_cb_t *cb, void *cb_ident)
+{
+       struct tcf_block_cb *block_cb;
+
+       block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
+       if (!block_cb)
+               return;
+       __tcf_block_cb_unregister(block_cb);
+}
+EXPORT_SYMBOL(tcf_block_cb_unregister);
+
+static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type,
+                            void *type_data, bool err_stop)
+{
+       struct tcf_block_cb *block_cb;
+       int ok_count = 0;
+       int err;
+
+       list_for_each_entry(block_cb, &block->cb_list, list) {
+               err = block_cb->cb(type, type_data, block_cb->cb_priv);
+               if (err) {
+                       if (err_stop)
+                               return err;
+               } else {
+                       ok_count++;
+               }
+       }
+       return ok_count;
+}
+
 /* Main classifier routine: scans classifier chain attached
  * to this qdisc, (optionally) tests for protocol and asks
  * specific classifiers.