netdev - Re: [patch net-next v2 00/20] net: sched: convert cls ndo_setup

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Date:   Fri, 27 Oct 2017 17:52:00 -0700
From:   Jakub Kicinski <kubakici@...pl>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     "Nambiar, Amritha" <amritha.nambiar@...el.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>, mlxsw@...lanox.com,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Ganesh Goudar <ganeshgr@...lsio.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>, idosch@...lanox.com,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Simon Horman <simon.horman@...ronome.com>,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        "Duyck, Alexander H" <alexander.h.duyck@...el.com>
Subject: Re: [patch net-next v2 00/20] net: sched: convert cls ndo_setup_tc
 offload calls to per-block callbacks

On Fri, 27 Oct 2017 09:27:30 +0200, Jiri Pirko wrote:
> >>> 2.       Deleting the ingress qdisc fails to remove filters added in
> >>> HW. Filters in SW gets deleted.
> >>>
> >>> We haven’t exactly root-caused this, the changes being extensive, but
> >>> our guess is again something wrong with the offload check or similar
> >>> while unregistering the block callback (tcf_block_cb_unregister) and
> >>> further to the classifier (CLS_U32/CLS_FLOWER etc.) with the
> >>> DESTROY/REMOVE command.  
> >> 
> >> Hmm. How does this worked previously. I mean, do you see change of
> >> behaviour? I'm asking because I don't see how rules added only to HW
> >> could be removed, driver should care of it. Or are you talking about
> >> rules added to both SW and HW?  
> >
> >These are rules added to both SW and HW. Previously all cls_* had
> >ndo_setup_tc calls based on the offload capability.
> >
> >commit 8d26d5636d "net: sched: avoid ndo_setup_tc calls for
> >TC_SETUP_CLS*" removed this bit to work with the new block callback. Is
> >there something similar in the block callback flow while acting on the
> >tcf_proto destroy call initiated when the qdisc is cleared?  
> 
> Yes, it is the same.

FWIW I also see what Amritha and Alex are describing here, for cls_bpf
there are no DESTROYs coming on rmmod or qdisc del.  There is a DESTROY
if I manually remove the filter (or if an ADD with skip_sw fails).