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net: sched: implement functions to put and flush all chains

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Extract code that flushes and puts all chains on tcf block to two
standalone function to be shared with functions that locklessly get/put
reference to block.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-09-24 19:22:55 +03:00 committed by David S. Miller
parent cfebd7e242
commit f00234367b
1 changed files with 30 additions and 25 deletions
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55
net/sched/cls_api.c
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@ -527,6 +527,31 @@ static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
return idr_find(&tn->idr, block_index);
}
static void tcf_block_flush_all_chains(struct tcf_block *block)
{
struct tcf_chain *chain;
/* Hold a refcnt for all chains, so that they don't disappear
* while we are iterating.
*/
list_for_each_entry(chain, &block->chain_list, list)
tcf_chain_hold(chain);
list_for_each_entry(chain, &block->chain_list, list)
tcf_chain_flush(chain);
}
static void tcf_block_put_all_chains(struct tcf_block *block)
{
struct tcf_chain *chain, *tmp;
/* At this point, all the chains should have refcnt >= 1. */
list_for_each_entry_safe(chain, tmp, &block->chain_list, list) {
tcf_chain_put_explicitly_created(chain);
tcf_chain_put(chain);
}
}
/* Find tcf block.
* Set q, parent, cl when appropriate.
*/
@ -786,8 +811,6 @@ EXPORT_SYMBOL(tcf_block_get);
void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
struct tcf_block_ext_info *ei)
{
struct tcf_chain *chain, *tmp;
if (!block)
return;
tcf_chain0_head_change_cb_del(block, ei);
@ -804,32 +827,14 @@ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
if (tcf_block_shared(block))
tcf_block_remove(block, block->net);
if (!free_block) {
/* Hold a refcnt for all chains, so that they don't
* disappear while we are iterating.
*/
list_for_each_entry(chain, &block->chain_list, list)
tcf_chain_hold(chain);
list_for_each_entry(chain, &block->chain_list, list)
tcf_chain_flush(chain);
}
if (!free_block)
tcf_block_flush_all_chains(block);
tcf_block_offload_unbind(block, q, ei);
if (free_block) {
if (free_block)
kfree(block);
} else {
/* At this point, all the chains should have
* refcnt >= 1.
*/
list_for_each_entry_safe(chain, tmp, &block->chain_list,
list) {
tcf_chain_put_explicitly_created(chain);
tcf_chain_put(chain);
}
}
else
tcf_block_put_all_chains(block);
} else {
tcf_block_offload_unbind(block, q, ei);
}