diff options
| author | Jason Wang <jasowang@redhat.com> | 2018-09-12 11:17:06 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-09-13 09:25:40 -0700 |
| commit | fe8dd45bb7556246c6b76277b1ba4296c91c2505 (patch) | |
| tree | 9e31911fda3e7b8ca55238498bf8becead0e3db4 /drivers/vhost | |
| parent | 1a097910adda6b3328fc235575bba0e9ee408492 (diff) | |
| download | linux-0-day-fe8dd45bb7556246c6b76277b1ba4296c91c2505.tar.gz linux-0-day-fe8dd45bb7556246c6b76277b1ba4296c91c2505.tar.xz | |
tun: switch to new type of msg_control
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>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/net.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 4e656f89cb225..fb01ce6d981c6 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -620,6 +620,7 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) .msg_controllen = 0, .msg_flags = MSG_DONTWAIT, }; + struct tun_msg_ctl ctl; size_t len, total_len = 0; int err; struct vhost_net_ubuf_ref *uninitialized_var(ubufs); @@ -664,8 +665,10 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) ubuf->ctx = nvq->ubufs; ubuf->desc = nvq->upend_idx; refcount_set(&ubuf->refcnt, 1); - msg.msg_control = ubuf; - msg.msg_controllen = sizeof(ubuf); + msg.msg_control = &ctl; + ctl.type = TUN_MSG_UBUF; + ctl.ptr = ubuf; + msg.msg_controllen = sizeof(ctl); ubufs = nvq->ubufs; atomic_inc(&ubufs->refcount); nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |