netdev - Re: [PATCH bpf-next 0/3] Introduce bpf

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Message-ID: <3a625c8b-6dc0-3933-25e5-f747197ae1f4@intel.com>
Date:   Mon, 15 Feb 2021 17:07:53 +0100
From:   Björn Töpel <bjorn.topel@...el.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        daniel@...earbox.net, ast@...nel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     andrii@...nel.org, toke@...hat.com, magnus.karlsson@...el.com,
        ciara.loftus@...el.com
Subject: Re: [PATCH bpf-next 0/3] Introduce bpf_link in libbpf's xsk

On 2021-02-15 16:46, Maciej Fijalkowski wrote:
> Hi,
> 
> This set is another approach towards addressing the below issue:
> 
> // load xdp prog and xskmap and add entry to xskmap at idx 10
> $ sudo ./xdpsock -i ens801f0 -t -q 10
> 
> // add entry to xskmap at idx 11
> $ sudo ./xdpsock -i ens801f0 -t -q 11
> 
> terminate one of the processes and another one is unable to work due to
> the fact that the XDP prog was unloaded from interface.
> 
> Previous attempt was, to put it mildly, a bit broken, as there was no
> synchronization between updates to additional map, as Bjorn pointed out.
> See https://lore.kernel.org/netdev/20190603131907.13395-5-maciej.fijalkowski@intel.com/
> 
> In the meantime bpf_link was introduced and it seems that it can address
> the issue of refcounting the XDP prog on interface. More info on commit
> messages.
>

For the series:

Reviewed-by: Björn Töpel <bjorn.topel@...el.com>
Acked-by: Björn Töpel <bjorn.topel@...el.com>

Finally, bpf_link/scoped XDP support! Thanks a lot!


Björn



> Thanks.
> 
> Maciej Fijalkowski (3):
>    libbpf: xsk: use bpf_link
>    libbpf: clear map_info before each bpf_obj_get_info_by_fd
>    samples: bpf: do not unload prog within xdpsock
> 
>   samples/bpf/xdpsock_user.c |  55 ++++----------
>   tools/lib/bpf/xsk.c        | 147 +++++++++++++++++++++++++++++++------
>   2 files changed, 139 insertions(+), 63 deletions(-)
>