Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code

[bpf-next V5 PATCH 00/15] XDP redirect memory return API · Jesper Dangaard Brouer <hidden> · 2018-03-23
[bpf-next V5 PATCH 01/15] mlx5: basic XDP_REDIRECT forward support · Jesper Dangaard Brouer <hidden> · 2018-03-23
[bpf-next V5 PATCH 02/15] xdp: introduce xdp_return_frame API and use in cpumap · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 02/15] xdp: introduce xdp_return_frame API and use in cpumap · Alexander Duyck <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 02/15] xdp: introduce xdp_return_frame API and use in cpumap · Jesper Dangaard Brouer <hidden> · 2018-03-26
[bpf-next V5 PATCH 03/15] ixgbe: use xdp_return_frame API · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 03/15] ixgbe: use xdp_return_frame API · Alexander Duyck <hidden> · 2018-03-23
[bpf-next V5 PATCH 04/15] xdp: move struct xdp_buff from filter.h to xdp.h · Jesper Dangaard Brouer <hidden> · 2018-03-23
[bpf-next V5 PATCH 05/15] xdp: introduce a new xdp_frame type · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 05/15] xdp: introduce a new xdp_frame type · Alexander Duyck <hidden> · 2018-03-23
[bpf-next V5 PATCH 06/15] tun: convert to use generic xdp_frame and xdp_return_frame API · Jesper Dangaard Brouer <hidden> · 2018-03-23
[bpf-next V5 PATCH 07/15] virtio_net: convert to use generic xdp_frame and xdp_return_frame API · Jesper Dangaard Brouer <hidden> · 2018-03-23
[bpf-next V5 PATCH 08/15] bpf: cpumap convert to use generic xdp_frame · Jesper Dangaard Brouer <hidden> · 2018-03-23
[bpf-next V5 PATCH 09/15] mlx5: register a memory model when XDP is enabled · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 09/15] mlx5: register a memory model when XDP is enabled · Sergei Shtylyov <hidden> · 2018-03-23
[bpf-next V5 PATCH 10/15] xdp: rhashtable with allocator ID to pointer mapping · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 10/15] xdp: rhashtable with allocator ID to pointer mapping · Alexander Duyck <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 10/15] xdp: rhashtable with allocator ID to pointer mapping · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 10/15] xdp: rhashtable with allocator ID to pointer mapping · Alexander Duyck <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 10/15] xdp: rhashtable with allocator ID to pointer mapping · Jesper Dangaard Brouer <hidden> · 2018-03-26
[bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Eric Dumazet <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Jesper Dangaard Brouer <hidden> · 2018-03-26
Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Eric Dumazet <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Eric Dumazet <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Jesper Dangaard Brouer <hidden> · 2018-03-26
Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page_pool code · Eric Dumazet <hidden> · 2018-03-23
[bpf-next V5 PATCH 12/15] xdp: allow page_pool as an allocator type in xdp_return_frame · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 12/15] xdp: allow page_pool as an allocator type in xdp_return_frame · Alexander Duyck <hidden> · 2018-03-23
[bpf-next V5 PATCH 13/15] mlx5: use page_pool for xdp_return_frame call · Jesper Dangaard Brouer <hidden> · 2018-03-23
[bpf-next V5 PATCH 14/15] xdp: transition into using xdp_frame for return API · Jesper Dangaard Brouer <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 14/15] xdp: transition into using xdp_frame for return API · Alexander Duyck <hidden> · 2018-03-23
Re: [bpf-next V5 PATCH 14/15] xdp: transition into using xdp_frame for return API · Jesper Dangaard Brouer <hidden> · 2018-03-26
[bpf-next V5 PATCH 15/15] xdp: transition into using xdp_frame for ndo_xdp_xmit · Jesper Dangaard Brouer <hidden> · 2018-03-23

From: Jesper Dangaard Brouer <hidden>
Date: 2018-03-26 15:19:46

On Fri, 23 Mar 2018 07:55:37 -0700
Eric Dumazet [off-list ref] wrote:

rcu grace period before freeing huge quantitites of pages is
problematic and could be used by syzbot to OOM the host.

Okay. Adjusted code to empty ring "right-way" when driver calls
destroy, and then only RCU delay/free the page_pool pointer and also
free/empty ring for pages of any in-flight producers.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer

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