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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

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Smooth Cong Wang's bug fix into 'net-next'.  Basically put
the bulk of the tcf_block_put() logic from 'net' into
tcf_block_put_ext(), but after the offload unbind.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2017-11-02 14:59:52 +09:00
parent 65c959a39b 3a99df9a3d
commit ed29668d1a
47 changed files with 285 additions and 170 deletions
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38
net/sched/cls_api.c
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@@ -322,8 +322,8 @@ static void tcf_block_put_final(struct work_struct *work)
struct tcf_block *block = container_of(work, struct tcf_block, work);
struct tcf_chain *chain, *tmp;
/* At this point, all the chains should have refcnt == 1. */
rtnl_lock();
/* Only chain 0 should be still here. */
list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
tcf_chain_put(chain);
rtnl_unlock();
@@ -331,44 +331,24 @@ static void tcf_block_put_final(struct work_struct *work)
}
/* XXX: Standalone actions are not allowed to jump to any chain, and bound
* actions should be all removed after flushing. However, filters are destroyed
* in RCU callbacks, we have to hold the chains first, otherwise we would
* always race with RCU callbacks on this list without proper locking.
* actions should be all removed after flushing. However, filters are now
* destroyed in tc filter workqueue with RTNL lock, they can not race here.
*/
static void tcf_block_put_deferred(struct work_struct *work)
{
struct tcf_block *block = container_of(work, struct tcf_block, work);
struct tcf_chain *chain;
rtnl_lock();
/* Hold a refcnt for all chains, except 0, in case they are gone. */
list_for_each_entry(chain, &block->chain_list, list)
if (chain->index)
tcf_chain_hold(chain);
/* No race on the list, because no chain could be destroyed. */
list_for_each_entry(chain, &block->chain_list, list)
tcf_chain_flush(chain);
INIT_WORK(&block->work, tcf_block_put_final);
/* Wait for RCU callbacks to release the reference count and make
* sure their works have been queued before this.
*/
rcu_barrier();
tcf_queue_work(&block->work);
rtnl_unlock();
}
void tcf_block_put_ext(struct tcf_block *block,
struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
struct tcf_block_ext_info *ei)
{
struct tcf_chain *chain, *tmp;
if (!block)
return;
tcf_block_offload_unbind(block, q, ei);
INIT_WORK(&block->work, tcf_block_put_deferred);
list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
tcf_chain_flush(chain);
INIT_WORK(&block->work, tcf_block_put_final);
/* Wait for existing RCU callbacks to cool down, make sure their works
* have been queued before this. We can not flush pending works here
* because we are holding the RTNL lock.