netdev - [RFC PATCH 0/9] virtio_net: support multi buffer xdp

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Date:   Tue, 22 Nov 2022 15:43:39 +0800
From:   Heng Qi <hengqi@...ux.alibaba.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [RFC PATCH 0/9] virtio_net: support multi buffer xdp

Currently, virtio net only supports xdp for single-buffer packets
or linearized multi-buffer packets. This patchset supports xdp for
multi-buffer packets, then GRO_HW related features can be
negotiated, and do not affect the processing of single-buffer xdp.

In order to build multi-buffer xdp neatly, we integrated the code
into virtnet_build_xdp_buff() for xdp. The first buffer is used
for prepared xdp buff, and the rest of the buffers are added to
its skb_shared_info structure. This structure can also be
conveniently converted during XDP_PASS to get the corresponding skb.

Since virtio net uses comp pages, and bpf_xdp_frags_increase_tail()
is based on the assumption of the page pool,
(rxq->frag_size - skb_frag_size(frag) - skb_frag_off(frag))
is negative in most cases. So we didn't set xdp_rxq->frag_size in
virtnet_open() to disable the tail increase.

Heng Qi (9):
  virtio_net: disable the hole mechanism for xdp
  virtio_net: set up xdp for multi buffer packets
  virtio_net: update bytes calculation for xdp_frame
  virtio_net: remove xdp related info from page_to_skb()
  virtio_net: build xdp_buff with multi buffers
  virtio_net: construct multi-buffer xdp in mergeable
  virtio_net: build skb from multi-buffer xdp
  virtio_net: transmit the multi-buffer xdp
  virtio_net: support multi-buffer xdp

 drivers/net/virtio_net.c | 356 ++++++++++++++++++++++++---------------
 1 file changed, 219 insertions(+), 137 deletions(-)

-- 
2.19.1.6.gb485710b