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Date:   Thu, 03 Sep 2020 22:41:26 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, davem@...emloft.net,
        lorenzo.bianconi@...hat.com, brouer@...hat.com,
        echaudro@...hat.com, sameehj@...zon.com, kuba@...nel.org,
        john.fastabend@...il.com, daniel@...earbox.net, ast@...nel.org,
        shayagr@...zon.com
Subject: RE: [PATCH v2 net-next 0/9] mvneta: introduce XDP multi-buffer
 support

Lorenzo Bianconi wrote:
> - Finalize XDP multi-buffer support for mvneta driver introducing the
>   capability to map non-linear buffers on tx side.
> - Introduce multi-buffer bit (mb) in xdp_frame/xdp_buffer to specify if
>   shared_info area has been properly initialized.
> - Initialize multi-buffer bit (mb) to 0 in all XDP-capable drivers.
> - Add multi-buff support to xdp_return_{buff/frame} utility routines.
> - Introduce bpf_xdp_adjust_mb_header helper to adjust frame headers moving
>   *offset* bytes from/to the second buffer to/from the first one.
>   This helper can be used to move headers when the hw DMA SG is not able
>   to copy all the headers in the first fragment and split header and data
>   pages. A possible use case for bpf_xdp_adjust_mb_header is described
>   here [0]

Are those slides available anywhere? [0] is just a link to the abstract.

> - Introduce bpf_xdp_get_frag_count and bpf_xdp_get_frags_total_size helpers to
>   report the total number/size of frags for a given xdp multi-buff.
> 
> XDP multi-buffer design principles are described here [1]
> For the moment we have not implemented any self-test for the introduced the bpf
> helpers. We can address this in a follow up series if the proposed approach
> is accepted.

Will need to include selftests with series.

> 
> Changes since v1:
> - Fix use-after-free in xdp_return_{buff/frame}
> - Introduce bpf helpers
> - Introduce xdp_mb sample program
> - access skb_shared_info->nr_frags only on the last fragment
> 
> Changes since RFC:
> - squash multi-buffer bit initialization in a single patch
> - add mvneta non-linear XDP buff support for tx side
> 
> [0] https://netdevconf.info/0x14/session.html?talk-the-path-to-tcp-4k-mtu-and-rx-zerocopy
> [1] https://github.com/xdp-project/xdp-project/blob/master/areas/core/xdp-multi-buffer01-design.org
> 
> Lorenzo Bianconi (7):
>   xdp: introduce mb in xdp_buff/xdp_frame
>   xdp: initialize xdp_buff mb bit to 0 in all XDP drivers
>   net: mvneta: update mb bit before passing the xdp buffer to eBPF layer
>   xdp: add multi-buff support to xdp_return_{buff/frame}
>   net: mvneta: add multi buffer support to XDP_TX
>   bpf: helpers: add bpf_xdp_adjust_mb_header helper
>   net: mvneta: enable jumbo frames for XDP
> 
> Sameeh Jubran (2):
>   bpf: helpers: add multibuffer support
>   samples/bpf: add bpf program that uses xdp mb helpers
> 
>  drivers/net/ethernet/amazon/ena/ena_netdev.c  |   1 +
>  drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c |   1 +
>  .../net/ethernet/cavium/thunder/nicvf_main.c  |   1 +
>  .../net/ethernet/freescale/dpaa2/dpaa2-eth.c  |   1 +
>  drivers/net/ethernet/intel/i40e/i40e_txrx.c   |   1 +
>  drivers/net/ethernet/intel/ice/ice_txrx.c     |   1 +
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |   1 +
>  .../net/ethernet/intel/ixgbevf/ixgbevf_main.c |   1 +
>  drivers/net/ethernet/marvell/mvneta.c         | 126 ++++++------
>  .../net/ethernet/marvell/mvpp2/mvpp2_main.c   |   1 +
>  drivers/net/ethernet/mellanox/mlx4/en_rx.c    |   1 +
>  .../net/ethernet/mellanox/mlx5/core/en_rx.c   |   1 +
>  .../ethernet/netronome/nfp/nfp_net_common.c   |   1 +
>  drivers/net/ethernet/qlogic/qede/qede_fp.c    |   1 +
>  drivers/net/ethernet/sfc/rx.c                 |   1 +
>  drivers/net/ethernet/socionext/netsec.c       |   1 +
>  drivers/net/ethernet/ti/cpsw.c                |   1 +
>  drivers/net/ethernet/ti/cpsw_new.c            |   1 +
>  drivers/net/hyperv/netvsc_bpf.c               |   1 +
>  drivers/net/tun.c                             |   2 +
>  drivers/net/veth.c                            |   1 +
>  drivers/net/virtio_net.c                      |   2 +
>  drivers/net/xen-netfront.c                    |   1 +
>  include/net/xdp.h                             |  26 ++-
>  include/uapi/linux/bpf.h                      |  39 +++-
>  net/core/dev.c                                |   1 +
>  net/core/filter.c                             |  93 +++++++++
>  net/core/xdp.c                                |  40 ++++
>  samples/bpf/Makefile                          |   3 +
>  samples/bpf/xdp_mb_kern.c                     |  68 +++++++
>  samples/bpf/xdp_mb_user.c                     | 182 ++++++++++++++++++
>  tools/include/uapi/linux/bpf.h                |  40 +++-
>  32 files changed, 572 insertions(+), 70 deletions(-)
>  create mode 100644 samples/bpf/xdp_mb_kern.c
>  create mode 100644 samples/bpf/xdp_mb_user.c
> 
> -- 
> 2.26.2
> 


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