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tun: switch to new type of msg_control

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This patch introduces to a new tun/tap specific msg_control:

#define TUN_MSG_UBUF 1
#define TUN_MSG_PTR  2
struct tun_msg_ctl {
       int type;
       void *ptr;
};

This allows us to pass different kinds of msg_control through
sendmsg(). The first supported type is ubuf (TUN_MSG_UBUF) which will
be used by the existed vhost_net zerocopy code. The second is XDP
buff, which allows vhost_net to pass XDP buff to TUN. This could be
used to implement accepting an array of XDP buffs from vhost_net in
the following patches.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang
2018-09-12 11:17:06 +08:00
committed by David S. Miller
parent 1a097910ad
commit fe8dd45bb7
4 changed files with 36 additions and 9 deletions
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14
include/linux/if_tun.h
View File

@@ -16,9 +16,23 @@
#define __IF_TUN_H
#include <uapi/linux/if_tun.h>
#include <uapi/linux/virtio_net.h>
#define TUN_XDP_FLAG 0x1UL
#define TUN_MSG_UBUF 1
#define TUN_MSG_PTR 2
struct tun_msg_ctl {
unsigned short type;
unsigned short num;
void *ptr;
};
struct tun_xdp_hdr {
int buflen;
struct virtio_net_hdr gso;
};
#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
struct socket *tun_get_socket(struct file *);
struct ptr_ring *tun_get_tx_ring(struct file *file);