netdev - Re: [PATCH net] net/sched: cls_flower: Don't err on HW flow add failure unless we're on skip

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Date:   Wed, 25 Oct 2017 17:01:52 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Or Gerlitz <ogerlitz@...lanox.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jiri Pirko <jiri@...lanox.com>, mlxsw@...lanox.com,
        Roi Dayan <roid@...lanox.com>, Paul Blakey <paulb@...lanox.com>
Subject: Re: [PATCH net] net/sched: cls_flower: Don't err on HW flow add
 failure unless we're on skip_sw

Wed, Oct 25, 2017 at 04:38:33PM CEST, ogerlitz@...lanox.com wrote:
>If we failed to offload a flow to HW, we should be err-ing only if skip_sw
>is set, otherwise this should go unnoted.

First of all, this patch should got to net-next, not net as you
indicate.


>
>Fixes: 717503b9cf57 ('net: sched: convert cls_flower->egress_dev users to tc_setup_cb_egdev infra')
>Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
>---
> net/sched/cls_flower.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
>diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
>index 16f58ab..ae2b5c6 100644
>--- a/net/sched/cls_flower.c
>+++ b/net/sched/cls_flower.c
>@@ -230,12 +230,10 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
> 
> 	err = tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
> 			       &cls_flower, skip_sw);
>-	if (err < 0) {
>+	if (err < 0)
> 		fl_hw_destroy_filter(tp, f);
>-		return err;

I believe it is better to do just:
		if (skip_sw)
			return err;
The reason is that you would propagate the actual error, not just
"-EINVAL" in all cases.


The same issue is present for matchall, u32 and bpf classifiers. Do you
want to fix it in one go? If not, I can take care of it. Up to you.


Thanks



>-	} else if (err > 0) {
>+	else if (err > 0)
> 		f->flags |= TCA_CLS_FLAGS_IN_HW;
>-	}
> 
> 	if (skip_sw && !(f->flags & TCA_CLS_FLAGS_IN_HW))
> 		return -EINVAL;
>-- 
>2.5.5
>