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net: sched: act_bpf: remove dependency on rtnl lock

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Use tcf spinlock to protect bpf action private data from concurrent
modification during dump and init. Remove rtnl lock assertion that is no
longer necessary.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-08-10 20:51:41 +03:00 committed by David S. Miller
parent 2b14e1ea21
commit 2142236b45
1 changed files with 7 additions and 3 deletions
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10
net/sched/act_bpf.c
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@ -143,11 +143,12 @@ static int tcf_bpf_dump(struct sk_buff *skb, struct tc_action *act,
.index = prog->tcf_index,
.refcnt = refcount_read(&prog->tcf_refcnt) - ref,
.bindcnt = atomic_read(&prog->tcf_bindcnt) - bind,
.action = prog->tcf_action,
};
struct tcf_t tm;
int ret;
spin_lock(&prog->tcf_lock);
opt.action = prog->tcf_action;
if (nla_put(skb, TCA_ACT_BPF_PARMS, sizeof(opt), &opt))
goto nla_put_failure;
@ -163,9 +164,11 @@ static int tcf_bpf_dump(struct sk_buff *skb, struct tc_action *act,
TCA_ACT_BPF_PAD))
goto nla_put_failure;
spin_unlock(&prog->tcf_lock);
return skb->len;
nla_put_failure:
spin_unlock(&prog->tcf_lock);
nlmsg_trim(skb, tp);
return -1;
}
@ -264,7 +267,7 @@ static void tcf_bpf_prog_fill_cfg(const struct tcf_bpf *prog,
{
cfg->is_ebpf = tcf_bpf_is_ebpf(prog);
/* updates to prog->filter are prevented, since it's called either
* with rtnl lock or during final cleanup in rcu callback
* with tcf lock or during final cleanup in rcu callback
*/
cfg->filter = rcu_dereference_protected(prog->filter, 1);
@ -336,8 +339,8 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
goto out;
prog = to_bpf(*act);
ASSERT_RTNL();
spin_lock(&prog->tcf_lock);
if (res != ACT_P_CREATED)
tcf_bpf_prog_fill_cfg(prog, &old);
@ -349,6 +352,7 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
prog->tcf_action = parm->action;
rcu_assign_pointer(prog->filter, cfg.filter);
spin_unlock(&prog->tcf_lock);
if (res == ACT_P_CREATED) {
tcf_idr_insert(tn, *act);