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net: sched: refactor police action helpers to require tcf_lock

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In order to remove rtnl lock dependency from flow_action representation
translator, change rcu_dereference_bh_rtnl() to rcu_dereference_protected()
in police action helpers that provide external access to rate and burst
values. This is safe to do because the functions are not called from
anywhere else outside flow_action infrastructure which was modified to
obtain tcf_lock when accessing action data in one of previous patches in
the series.

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 2020-02-17 12:12:10 +02:00 committed by David S. Miller
parent 7a47281439
commit 487e9589cc
1 changed files with 4 additions and 2 deletions
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6
include/net/tc_act/tc_police.h
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@ -54,7 +54,8 @@ static inline u64 tcf_police_rate_bytes_ps(const struct tc_action *act)
struct tcf_police *police = to_police(act);
struct tcf_police_params *params;
params = rcu_dereference_bh_rtnl(police->params);
params = rcu_dereference_protected(police->params,
lockdep_is_held(&police->tcf_lock));
return params->rate.rate_bytes_ps;
}
@ -63,7 +64,8 @@ static inline s64 tcf_police_tcfp_burst(const struct tc_action *act)
struct tcf_police *police = to_police(act);
struct tcf_police_params *params;
params = rcu_dereference_bh_rtnl(police->params);
params = rcu_dereference_protected(police->params,
lockdep_is_held(&police->tcf_lock));
return params->tcfp_burst;
}