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Date:   Wed, 14 Aug 2019 17:25:51 +0900
From:   "Daniel T. Lee" <danieltimlee@...il.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [v5,0/4] tools: bpftool: add net attach/detach command to attach
 XDP prog

On Wed, Aug 14, 2019 at 6:43 AM Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
>
> On Tue, 13 Aug 2019 11:46:17 +0900, Daniel T. Lee wrote:
> > Currently, bpftool net only supports dumping progs attached on the
> > interface. To attach XDP prog on interface, user must use other tool
> > (eg. iproute2). By this patch, with `bpftool net attach/detach`, user
> > can attach/detach XDP prog on interface.
> >
> >     # bpftool prog
> >         16: xdp  name xdp_prog1  tag 539ec6ce11b52f98  gpl
> >         loaded_at 2019-08-07T08:30:17+0900  uid 0
> >         ...
> >         20: xdp  name xdp_fwd_prog  tag b9cb69f121e4a274  gpl
> >         loaded_at 2019-08-07T08:30:17+0900  uid 0
> >
> >     # bpftool net attach xdpdrv id 16 dev enp6s0np0
> >     # bpftool net
> >     xdp:
> >         enp6s0np0(4) driver id 16
> >
> >     # bpftool net attach xdpdrv id 20 dev enp6s0np0 overwrite
> >     # bpftool net
> >     xdp:
> >         enp6s0np0(4) driver id 20
> >
> >     # bpftool net detach xdpdrv dev enp6s0np0
> >     # bpftool net
> >     xdp:
> >
> >
> > While this patch only contains support for XDP, through `net
> > attach/detach`, bpftool can further support other prog attach types.
> >
> > XDP attach/detach tested on Mellanox ConnectX-4 and Netronome Agilio.
> >
> > ---
> > Changes in v5:
> >   - fix wrong error message, from errno to err with do_attach/detach
>
> The inconsistency in libbpf's error reporting is generally troubling,
> but a problem of this set, so:
>
> Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>
> In the future please keep review tags if you have only made minor
> changes to the code.

Thank you for the review.
Sorry to bother you. I'll keep that in mind.

Thanks!

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