netdev - [PATCH net-next 0/3] vhost_net: access ptr ring using tap recvmsg

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Date:   Sat, 12 Oct 2019 10:53:54 +0900
From:   prashantbhole.linux@...il.com
To:     "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Prashant Bhole <prashantbhole.linux@...il.com>,
        David Ahern <dsahern@...il.com>, kvm@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH net-next 0/3] vhost_net: access ptr ring using tap recvmsg

From: Prashant Bhole <prashantbhole.linux@...il.com>

vhost_net needs to peek tun packet sizes to allocate virtio buffers.
Currently it directly accesses tap ptr ring to do it. Jason Wang
suggested to achieve this using msghdr->msg_control and modifying the
behavior of tap recvmsg.

This change will be useful in future in case of virtio-net XDP
offload. Where packets will be XDP processed in tap recvmsg and vhost
will see only non XDP_DROP'ed packets.

Patch 1: reorganizes the tun_msg_ctl so that it can be extended by
 the means of different commands. tap sendmsg recvmsg will behave
 according to commands.

Patch 2: modifies recvmsg implementation to produce packet pointers.
 vhost_net uses recvmsg API instead of ptr_ring_consume().

Patch 3: removes ptr ring usage in vhost and functions those export
 ptr ring from tun/tap.

Prashant Bhole (3):
  tuntap: reorganize tun_msg_ctl usage
  vhost_net: user tap recvmsg api to access ptr ring
  tuntap: remove usage of ptr ring in vhost_net

 drivers/net/tap.c      | 44 ++++++++++++++---------
 drivers/net/tun.c      | 45 +++++++++++++++---------
 drivers/vhost/net.c    | 79 ++++++++++++++++++++++--------------------
 include/linux/if_tun.h |  9 +++--
 4 files changed, 103 insertions(+), 74 deletions(-)

-- 
2.21.0