Mon, Aug 26, 2019 at 03:44:57PM CEST, vla...@mellanox.com wrote: >In order to remove dependency on rtnl lock, extend tcf_block with 'cb_lock' >rwsem and use it to protect flow_block->cb_list and related counters from >concurrent modification. The lock is taken in read mode for read-only >traversal of cb_list in tc_setup_cb_call() and write mode in all other >cases. This approach ensures that: > >- cb_list is not changed concurrently while filters is being offloaded on > block. > >- block->nooffloaddevcnt is checked while holding the lock in read mode, > but is only changed by bind/unbind code when holding the cb_lock in write > mode to prevent concurrent modification. > >Signed-off-by: Vlad Buslov <vla...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
