[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20180516095953.GI1972@nanopsycho>
Date: Wed, 16 May 2018 11:59:53 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Vlad Buslov <vladbu@...lanox.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
xiyou.wangcong@...il.com, pablo@...filter.org,
kadlec@...ckhole.kfki.hu, fw@...len.de, ast@...nel.org,
daniel@...earbox.net, edumazet@...gle.com, keescook@...omium.org,
linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
coreteam@...filter.org, kliteyn@...lanox.com
Subject: Re: [PATCH 12/14] net: sched: retry action check-insert on
concurrent modification
Mon, May 14, 2018 at 04:27:13PM CEST, vladbu@...lanox.com wrote:
>Retry check-insert sequence in action init functions if action with same
>index was inserted concurrently.
>
>Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
>---
> net/sched/act_bpf.c | 8 +++++++-
> net/sched/act_connmark.c | 8 +++++++-
> net/sched/act_csum.c | 8 +++++++-
> net/sched/act_gact.c | 8 +++++++-
> net/sched/act_ife.c | 8 +++++++-
> net/sched/act_ipt.c | 8 +++++++-
> net/sched/act_mirred.c | 8 +++++++-
> net/sched/act_nat.c | 8 +++++++-
> net/sched/act_pedit.c | 8 +++++++-
> net/sched/act_police.c | 9 ++++++++-
> net/sched/act_sample.c | 8 +++++++-
> net/sched/act_simple.c | 9 ++++++++-
> net/sched/act_skbedit.c | 8 +++++++-
> net/sched/act_skbmod.c | 8 +++++++-
> net/sched/act_tunnel_key.c | 9 ++++++++-
> net/sched/act_vlan.c | 9 ++++++++-
> 16 files changed, 116 insertions(+), 16 deletions(-)
>
>diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
>index 5554bf7..7e20fdc 100644
>--- a/net/sched/act_bpf.c
>+++ b/net/sched/act_bpf.c
>@@ -299,10 +299,16 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
>
> parm = nla_data(tb[TCA_ACT_BPF_PARMS]);
>
>+replay:
> if (!tcf_idr_check(tn, parm->index, act, bind)) {
> ret = tcf_idr_create(tn, parm->index, est, act,
> &act_bpf_ops, bind, true);
>- if (ret < 0)
>+ /* Action with specified index was created concurrently.
>+ * Check again.
>+ */
>+ if (parm->index && ret == -ENOSPC)
>+ goto replay;
>+ else if (ret)
Hmm, looks like you are doing the same/very similar thing in every act
code. I think it would make sense to introduce a helper function for
this purpose.
[...]
Powered by blists - more mailing lists