netdev - Re: [PATCH net-next v4 6/8] net: sched: create tc_can_offload

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Date:   Sat, 20 Jan 2018 02:33:31 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     David Miller <davem@...emloft.net>,
        David Ahern <dsahern@...il.com>, aring@...atatu.com,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        oss-drivers@...ronome.com,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: Re: [PATCH net-next v4 6/8] net: sched: create tc_can_offload_extack()
 wrapper

On Sat, Jan 20, 2018 at 2:22 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> Sat, Jan 20, 2018 at 11:12:25AM CET, jakub.kicinski@...ronome.com wrote:
>>net/sched/sch_prio.c:   if (!tc_can_offload(dev) ||
>>!dev->netdev_ops->ndo_setup_tc)
>>net/sched/sch_prio.c:   if (!tc_can_offload(dev) ||
>>!dev->netdev_ops->ndo_setup_tc)
>>net/sched/sch_red.c:    if (!tc_can_offload(dev) ||
>>!dev->netdev_ops->ndo_setup_tc)
>>net/sched/sch_red.c:    if (!tc_can_offload(dev) ||
>>!dev->netdev_ops->ndo_setup_tc)
>>
>>Do you mean the qdisc offloads too?  The whole lot?
>
> Yes.

Actually looking at the qdisc code and destroy callbacks, if we plumb
it through everywhere won't that mean user will see error messages on
destroy of qdiscs/filters which were never offloaded?

Just looking at prio_offload() as a simple example.  prio_destroy()
will always call tc_can_offload().

Hmm...