net: sched: Avoid implicit chain 0 creation
Currently, chain 0 is implicitly created during block creation. However that does not align with chain object exposure, creation and destruction api introduced later on. So make the chain 0 behave the same way as any other chain and only create it when it is needed. Since chain 0 is somehow special as the qdiscs need to hold pointer to the first chain tp, this requires to move the chain head change callback infra to the block structure. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
David S. Miller
Родитель
f34e8bff58
Коммит
f71e0ca4db
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@ -300,7 +300,6 @@ typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
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struct tcf_chain {
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struct tcf_proto __rcu *filter_chain;
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struct list_head filter_chain_list;
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struct list_head list;
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struct tcf_block *block;
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u32 index; /* chain index */
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@ -318,6 +317,10 @@ struct tcf_block {
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bool keep_dst;
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unsigned int offloadcnt; /* Number of oddloaded filters */
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unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
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struct {
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struct tcf_chain *chain;
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struct list_head filter_chain_list;
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} chain0;
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};
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static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
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@ -204,11 +204,12 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
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chain = kzalloc(sizeof(*chain), GFP_KERNEL);
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if (!chain)
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return NULL;
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INIT_LIST_HEAD(&chain->filter_chain_list);
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list_add_tail(&chain->list, &block->chain_list);
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chain->block = block;
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chain->index = chain_index;
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chain->refcnt = 1;
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if (!chain->index)
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block->chain0.chain = chain;
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return chain;
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}
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@ -218,12 +219,16 @@ static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
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if (item->chain_head_change)
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item->chain_head_change(tp_head, item->chain_head_change_priv);
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}
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static void tcf_chain_head_change(struct tcf_chain *chain,
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struct tcf_proto *tp_head)
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static void tcf_chain0_head_change(struct tcf_chain *chain,
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struct tcf_proto *tp_head)
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{
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struct tcf_filter_chain_list_item *item;
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struct tcf_block *block = chain->block;
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list_for_each_entry(item, &chain->filter_chain_list, list)
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if (chain->index)
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return;
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list_for_each_entry(item, &block->chain0.filter_chain_list, list)
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tcf_chain_head_change_item(item, tp_head);
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}
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@ -231,7 +236,7 @@ static void tcf_chain_flush(struct tcf_chain *chain)
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{
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struct tcf_proto *tp = rtnl_dereference(chain->filter_chain);
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tcf_chain_head_change(chain, NULL);
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tcf_chain0_head_change(chain, NULL);
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while (tp) {
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RCU_INIT_POINTER(chain->filter_chain, tp->next);
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tcf_proto_destroy(tp, NULL);
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@ -245,8 +250,10 @@ static void tcf_chain_destroy(struct tcf_chain *chain)
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struct tcf_block *block = chain->block;
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list_del(&chain->list);
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if (!chain->index)
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block->chain0.chain = NULL;
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kfree(chain);
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if (list_empty(&block->chain_list))
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if (list_empty(&block->chain_list) && block->refcnt == 0)
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kfree(block);
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}
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@ -346,10 +353,11 @@ no_offload_dev_dec:
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}
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static int
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tcf_chain_head_change_cb_add(struct tcf_chain *chain,
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struct tcf_block_ext_info *ei,
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struct netlink_ext_ack *extack)
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tcf_chain0_head_change_cb_add(struct tcf_block *block,
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struct tcf_block_ext_info *ei,
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struct netlink_ext_ack *extack)
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{
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struct tcf_chain *chain0 = block->chain0.chain;
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struct tcf_filter_chain_list_item *item;
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item = kmalloc(sizeof(*item), GFP_KERNEL);
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@ -359,23 +367,25 @@ tcf_chain_head_change_cb_add(struct tcf_chain *chain,
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}
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item->chain_head_change = ei->chain_head_change;
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item->chain_head_change_priv = ei->chain_head_change_priv;
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if (chain->filter_chain)
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tcf_chain_head_change_item(item, chain->filter_chain);
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list_add(&item->list, &chain->filter_chain_list);
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if (chain0 && chain0->filter_chain)
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tcf_chain_head_change_item(item, chain0->filter_chain);
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list_add(&item->list, &block->chain0.filter_chain_list);
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return 0;
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}
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static void
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tcf_chain_head_change_cb_del(struct tcf_chain *chain,
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struct tcf_block_ext_info *ei)
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tcf_chain0_head_change_cb_del(struct tcf_block *block,
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struct tcf_block_ext_info *ei)
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{
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struct tcf_chain *chain0 = block->chain0.chain;
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struct tcf_filter_chain_list_item *item;
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list_for_each_entry(item, &chain->filter_chain_list, list) {
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list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
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if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
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(item->chain_head_change == ei->chain_head_change &&
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item->chain_head_change_priv == ei->chain_head_change_priv)) {
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tcf_chain_head_change_item(item, NULL);
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if (chain0)
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tcf_chain_head_change_item(item, NULL);
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list_del(&item->list);
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kfree(item);
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return;
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@ -411,8 +421,6 @@ static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
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struct netlink_ext_ack *extack)
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{
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struct tcf_block *block;
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struct tcf_chain *chain;
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int err;
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block = kzalloc(sizeof(*block), GFP_KERNEL);
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if (!block) {
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@ -422,14 +430,8 @@ static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
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INIT_LIST_HEAD(&block->chain_list);
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INIT_LIST_HEAD(&block->cb_list);
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INIT_LIST_HEAD(&block->owner_list);
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INIT_LIST_HEAD(&block->chain0.filter_chain_list);
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/* Create chain 0 by default, it has to be always present. */
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chain = tcf_chain_create(block, 0);
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if (!chain) {
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NL_SET_ERR_MSG(extack, "Failed to create new tcf chain");
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err = -ENOMEM;
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goto err_chain_create;
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}
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block->refcnt = 1;
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block->net = net;
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block->index = block_index;
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@ -438,10 +440,6 @@ static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
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if (!tcf_block_shared(block))
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block->q = q;
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return block;
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err_chain_create:
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kfree(block);
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return ERR_PTR(err);
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}
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static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
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@ -523,11 +521,6 @@ static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
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return block;
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}
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static struct tcf_chain *tcf_block_chain_zero(struct tcf_block *block)
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{
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return list_first_entry(&block->chain_list, struct tcf_chain, list);
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}
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struct tcf_block_owner_item {
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struct list_head list;
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struct Qdisc *q;
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@ -621,10 +614,9 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
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tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
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err = tcf_chain_head_change_cb_add(tcf_block_chain_zero(block),
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ei, extack);
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err = tcf_chain0_head_change_cb_add(block, ei, extack);
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if (err)
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goto err_chain_head_change_cb_add;
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goto err_chain0_head_change_cb_add;
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err = tcf_block_offload_bind(block, q, ei, extack);
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if (err)
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@ -634,15 +626,14 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
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return 0;
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err_block_offload_bind:
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tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei);
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err_chain_head_change_cb_add:
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tcf_chain0_head_change_cb_del(block, ei);
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err_chain0_head_change_cb_add:
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tcf_block_owner_del(block, q, ei->binder_type);
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err_block_owner_add:
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if (created) {
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if (tcf_block_shared(block))
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tcf_block_remove(block, net);
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err_block_insert:
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kfree(tcf_block_chain_zero(block));
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kfree(block);
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} else {
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block->refcnt--;
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@ -682,10 +673,10 @@ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
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if (!block)
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return;
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tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei);
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tcf_chain0_head_change_cb_del(block, ei);
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tcf_block_owner_del(block, q, ei->binder_type);
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if (--block->refcnt == 0) {
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if (block->refcnt == 1) {
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if (tcf_block_shared(block))
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tcf_block_remove(block, block->net);
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@ -701,13 +692,14 @@ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
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tcf_block_offload_unbind(block, q, ei);
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if (block->refcnt == 0) {
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if (block->refcnt == 1) {
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/* At this point, all the chains should have refcnt >= 1. */
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list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
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tcf_chain_put(chain);
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/* Finally, put chain 0 and allow block to be freed. */
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tcf_chain_put(tcf_block_chain_zero(block));
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block->refcnt--;
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if (list_empty(&block->chain_list))
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kfree(block);
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}
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}
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EXPORT_SYMBOL(tcf_block_put_ext);
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@ -947,7 +939,7 @@ static void tcf_chain_tp_insert(struct tcf_chain *chain,
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struct tcf_proto *tp)
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{
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if (*chain_info->pprev == chain->filter_chain)
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tcf_chain_head_change(chain, tp);
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tcf_chain0_head_change(chain, tp);
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RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
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rcu_assign_pointer(*chain_info->pprev, tp);
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tcf_chain_hold(chain);
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@ -960,7 +952,7 @@ static void tcf_chain_tp_remove(struct tcf_chain *chain,
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struct tcf_proto *next = rtnl_dereference(chain_info->next);
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if (tp == chain->filter_chain)
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tcf_chain_head_change(chain, next);
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tcf_chain0_head_change(chain, next);
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RCU_INIT_POINTER(*chain_info->pprev, next);
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tcf_chain_put(chain);
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}
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