Re: [PATCH bpf-next 0/3] Introduce bpf_link in libbpf's xsk

["Björn Töpel" <bjorn.topel@intel.com>]

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@intel.com>
Acked-by: Björn Töpel <bjorn.topel@intel.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(-)
>