netdev - Re: [PATCH bpf-next v2 02/11] net: sched: prepare extack support for offload via tc_cls_common

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Date:   Tue, 16 Jan 2018 10:33:52 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     davem@...emloft.net, daniel@...earbox.net,
        alexei.starovoitov@...il.com, netdev@...r.kernel.org,
        dsahern@...il.com, oss-drivers@...ronome.com,
        john.fastabend@...il.com, jhs@...atatu.com, gerlitz.or@...il.com,
        aring@...atatu.com, xiyou.wangcong@...il.com,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: Re: [PATCH bpf-next v2 02/11] net: sched: prepare extack support for
 offload via tc_cls_common_offload

Tue, Jan 16, 2018 at 03:08:36AM CET, jakub.kicinski@...ronome.com wrote:
>From: Quentin Monnet <quentin.monnet@...ronome.com>
>
>Prepare for extack support for hardware offload of classifiers. In order
>to achieve this, a pointer to a struct netlink_ext_ack is added to the
>struct tc_cls_common_offload that is passed to the callback for setting
>up the classifier. Function tc_cls_common_offload_init() is updated to
>support initialization of this new attribute.
>
>Extack plumbing is not complete yet.
>
>Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>
>Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>---

[...]


>diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
>index 998ee4faf934..f1640a98a3d2 100644
>--- a/net/sched/cls_flower.c
>+++ b/net/sched/cls_flower.c
>@@ -223,7 +223,7 @@ static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f)
> 	struct tc_cls_flower_offload cls_flower = {};
> 	struct tcf_block *block = tp->chain->block;
> 
>-	tc_cls_common_offload_init(&cls_flower.common, tp);
>+	tc_cls_common_offload_init(&cls_flower.common, tp, NULL);

You should have the patch assing extack arg to fl_hw_replace_filter
prior to this patch. Then you don't need this odd NULL pass.
Same for other cls.