From: Jiri Pirko <j...@mellanox.com>
So far, there was possible only to register a single filter chain
pointer to block->chain[0]. However, when the blocks will get shareable,
we need to allow multiple filter chain pointers registration.
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
v6->v7:
- unsquashed shared block patch that was previously squashed by mistake
- fixed error path in block create - freeing chain 0
v3->v4:
- rebased on top of the current net-next
- added some extack strings
v2->v3:
- rebased on top of the current net-next
---
include/net/sch_generic.h | 3 +-
net/sched/cls_api.c | 77 ++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 70 insertions(+), 10 deletions(-)
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index ac029d5..ddb96bb 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -275,8 +275,7 @@ typedef void tcf_chain_head_change_t(struct tcf_proto
*tp_head, void *priv);
struct tcf_chain {
struct tcf_proto __rcu *filter_chain;
- tcf_chain_head_change_t *chain_head_change;
- void *chain_head_change_priv;
+ struct list_head filter_chain_list;
struct list_head list;
struct tcf_block *block;
u32 index; /* chain index */
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 6708b69..e6b16b3 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -179,6 +179,12 @@ static void tcf_proto_destroy(struct tcf_proto *tp)
kfree_rcu(tp, rcu);
}
+struct tcf_filter_chain_list_item {
+ struct list_head list;
+ tcf_chain_head_change_t *chain_head_change;
+ void *chain_head_change_priv;
+};
+
static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
u32 chain_index)
{
@@ -187,6 +193,7 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block
*block,
chain = kzalloc(sizeof(*chain), GFP_KERNEL);
if (!chain)
return NULL;
+ INIT_LIST_HEAD(&chain->filter_chain_list);
list_add_tail(&chain->list, &block->chain_list);
chain->block = block;
chain->index = chain_index;
@@ -194,12 +201,19 @@ static struct tcf_chain *tcf_chain_create(struct
tcf_block *block,
return chain;
}
+static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
+ struct tcf_proto *tp_head)
+{
+ if (item->chain_head_change)
+ item->chain_head_change(tp_head, item->chain_head_change_priv);
+}
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);
+ struct tcf_filter_chain_list_item *item;
+
+ list_for_each_entry(item, &chain->filter_chain_list, list)
+ tcf_chain_head_change_item(item, tp_head);
}
static void tcf_chain_flush(struct tcf_chain *chain)
@@ -280,6 +294,50 @@ static void tcf_block_offload_unbind(struct tcf_block
*block, struct Qdisc *q,
tcf_block_offload_cmd(block, q, ei, TC_BLOCK_UNBIND);
}
+static int
+tcf_chain_head_change_cb_add(struct tcf_chain *chain,
+ struct tcf_block_ext_info *ei,
+ struct netlink_ext_ack *extack)
+{
+ struct tcf_filter_chain_list_item *item;
+
+ item = kmalloc(sizeof(*item), GFP_KERNEL);
+ if (!item) {
+ NL_SET_ERR_MSG(extack, "Memory allocation for head change
callback item failed");
+ return -ENOMEM;
+ }
+ item->chain_head_change = ei->chain_head_change;
+ item->chain_head_change_priv = ei->chain_head_change_priv;
+ if (chain->filter_chain)
+ tcf_chain_head_change_item(item, chain->filter_chain);
+ list_add(&item->list, &chain->filter_chain_list);
+ return 0;
+}
+
+static void
+tcf_chain_head_change_cb_del(struct tcf_chain *chain,
+ struct tcf_block_ext_info *ei)
+{
+ struct tcf_filter_chain_list_item *item;
+
+ list_for_each_entry(item, &chain->filter_chain_list, list) {
+ if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
+ (item->chain_head_change == ei->chain_head_change &&
+ item->chain_head_change_priv ==
ei->chain_head_change_priv)) {
+ tcf_chain_head_change_item(item, NULL);
+ list_del(&item->list);
+ kfree(item);
+ return;
+ }
+ }
+ WARN_ON(1);
+}
+
+static struct tcf_chain *tcf_block_chain_zero(struct tcf_block *block)
+{
+ return list_first_entry(&block->chain_list, struct tcf_chain, list);
+}
+
int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
struct tcf_block_ext_info *ei,
struct netlink_ext_ack *extack)
@@ -302,9 +360,10 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct
Qdisc *q,
err = -ENOMEM;
goto err_chain_create;
}
- WARN_ON(!ei->chain_head_change);
- chain->chain_head_change = ei->chain_head_change;
- chain->chain_head_change_priv = ei->chain_head_change_priv;
+ err = tcf_chain_head_change_cb_add(tcf_block_chain_zero(block),
+ ei, extack);
+ if (err)
+ goto err_chain_head_change_cb_add;
block->net = qdisc_net(q);
block->q = q;
tcf_block_offload_bind(block, q, ei);
@@ -313,6 +372,8 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct
Qdisc *q,
err_chain_create:
kfree(block);
+err_chain_head_change_cb_add:
+ kfree(chain);
return err;
}
EXPORT_SYMBOL(tcf_block_get_ext);
@@ -351,6 +412,7 @@ void tcf_block_put_ext(struct tcf_block *block, struct
Qdisc *q,
*/
if (!block)
return;
+ tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei);
list_for_each_entry(chain, &block->chain_list, list)
tcf_chain_hold(chain);
@@ -364,8 +426,7 @@ void tcf_block_put_ext(struct tcf_block *block, struct
Qdisc *q,
tcf_chain_put(chain);
/* Finally, put chain 0 and allow block to be freed. */
- chain = list_first_entry(&block->chain_list, struct tcf_chain, list);
- tcf_chain_put(chain);
+ tcf_chain_put(tcf_block_chain_zero(block));
}
EXPORT_SYMBOL(tcf_block_put_ext);
--
2.9.5
