From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: netdev@vger.kernel.org, BjörnTöpel <bjorn.topel@intel.com>,
magnus.karlsson@intel.com, eugenia@mellanox.com,
"John Fastabend" <john.fastabend@gmail.com>,
"Eran Ben Elisha" <eranbe@mellanox.com>,
"Saeed Mahameed" <saeedm@mellanox.com>,
galp@mellanox.com, "Daniel Borkmann" <borkmann@iogearbox.net>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Tariq Toukan" <tariqt@mellanox.com>,
brouer@redhat.com
Subject: Re: [bpf-next V2 PATCH 10/15] xdp: rhashtable with allocator ID to pointer mapping
Date: Mon, 19 Mar 2018 10:48:58 +0100 [thread overview]
Message-ID: <20180319104858.4cba3a6b@redhat.com> (raw)
In-Reply-To: <36f68a76-4c73-e0d1-b97b-645393e006ee@redhat.com>
On Fri, 16 Mar 2018 16:45:30 +0800
Jason Wang <jasowang@redhat.com> wrote:
> On 2018年03月10日 00:07, Jesper Dangaard Brouer wrote:
> > On Fri, 9 Mar 2018 21:07:36 +0800
> > Jason Wang <jasowang@redhat.com> wrote:
> >
> >>>>> Use the IDA infrastructure for getting a cyclic increasing ID number,
> >>>>> that is used for keeping track of each registered allocator per
> >>>>> RX-queue xdp_rxq_info.
> >>>>>
> >>>>> Signed-off-by: Jesper Dangaard Brouer<brouer@redhat.com>
> >>>> A stupid question is, can we manage to unify this ID with NAPI id?
> >>> Sorry I don't understand the question?
> >>
> >> I mean can we associate page poll pointer to napi_struct, record NAPI id
> >> in xdp_mem_info and do lookup through NAPI id?
> >
> > No. The driver can unreg/reg a new XDP memory model,
>
> Is there an actual use case for this?
I believe this is the common use case. When attaching an XDP/bpf prog,
then the driver usually want to change the RX-ring memory model
(different performance trade off). When detaching XDP, then driver
want to change back to old memory model. During this process, I
believe, the NAPI-ID remains the same (right?).
> > without reloading
> > the NAPI and generate a new NAPI id.
> >
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
next prev parent reply other threads:[~2018-03-19 9:49 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-08 13:07 [bpf-next V2 PATCH 00/15] XDP redirect memory return API Jesper Dangaard Brouer
2018-03-08 13:07 ` [bpf-next V2 PATCH 01/15] mlx5: basic XDP_REDIRECT forward support Jesper Dangaard Brouer
2018-03-08 13:07 ` [bpf-next V2 PATCH 02/15] xdp: introduce xdp_return_frame API and use in cpumap Jesper Dangaard Brouer
2018-03-09 7:24 ` Jason Wang
2018-03-09 9:35 ` Jesper Dangaard Brouer
2018-03-09 13:04 ` Jason Wang
2018-03-09 16:05 ` Jesper Dangaard Brouer
2018-03-16 8:43 ` Jason Wang
2018-03-08 13:07 ` [bpf-next V2 PATCH 03/15] ixgbe: use xdp_return_frame API Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 04/15] xdp: move struct xdp_buff from filter.h to xdp.h Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 05/15] xdp: introduce a new xdp_frame type Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 06/15] tun: convert to use generic xdp_frame and xdp_return_frame API Jesper Dangaard Brouer
2018-03-08 15:16 ` Jesper Dangaard Brouer
2018-03-09 7:16 ` Jason Wang
2018-03-09 8:46 ` Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 07/15] virtio_net: " Jesper Dangaard Brouer
2018-03-09 8:03 ` Jason Wang
2018-03-09 9:44 ` Jesper Dangaard Brouer
2018-03-09 13:11 ` Jason Wang
2018-03-08 13:08 ` [bpf-next V2 PATCH 08/15] bpf: cpumap convert to use generic xdp_frame Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 09/15] mlx5: register a memory model when XDP is enabled Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 10/15] xdp: rhashtable with allocator ID to pointer mapping Jesper Dangaard Brouer
2018-03-09 8:08 ` Jason Wang
2018-03-09 9:37 ` Jesper Dangaard Brouer
2018-03-09 13:07 ` Jason Wang
2018-03-09 16:07 ` Jesper Dangaard Brouer
2018-03-16 8:45 ` Jason Wang
2018-03-19 9:48 ` Jesper Dangaard Brouer [this message]
2018-03-20 2:26 ` Jason Wang
2018-03-20 14:27 ` Jesper Dangaard Brouer
2018-03-22 2:16 ` Jason Wang
2018-03-08 13:08 ` [bpf-next V2 PATCH 11/15] page_pool: refurbish version of page_pool code Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 12/15] xdp: allow page_pool as an allocator type in xdp_return_frame Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 13/15] mlx5: use page_pool for xdp_return_frame call Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 14/15] xdp: transition into using xdp_frame for return API Jesper Dangaard Brouer
2018-03-08 13:08 ` [bpf-next V2 PATCH 15/15] xdp: transition into using xdp_frame for ndo_xdp_xmit Jesper Dangaard Brouer
2018-03-08 15:03 ` [bpf-next V2 PATCH 00/15] XDP redirect memory return API Alexander Duyck
2018-03-08 15:30 ` Jesper Dangaard Brouer
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