diff options
| author | Jason Wang <jasowang@redhat.com> | 2013-01-30 19:12:34 +0800 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2013-02-01 11:03:02 -0600 |
| commit | 264986e2c8f14a0f4a32ac6f1e083905833a5fc7 (patch) | |
| tree | b109c87bb400c12501553ed966607e33a9050e75 /net/tap-linux.c | |
| parent | e5dc0b402e64d245956c47cf22776e5206f322dc (diff) | |
tap: multiqueue support
Recently, linux support multiqueue tap which could let userspace call TUNSETIFF
for a signle device many times to create multiple file descriptors as
independent queues. User could also enable/disabe a specific queue through
TUNSETQUEUE.
The patch adds the generic infrastructure to create multiqueue taps. To achieve
this a new parameter "queues" were introduced to specify how many queues were
expected to be created for tap by qemu itself. Alternatively, management could
also pass multiple pre-created tap file descriptors separated with ':' through a
new parameter fds like -netdev tap,id=hn0,fds="X:Y:..:Z". Multiple vhost file
descriptors could also be passed in this way.
Each TAPState were still associated to a tap fd, which mean multiple TAPStates
were created when user needs multiqueue taps. Since each TAPState contains one
NetClientState, with the multiqueue nic support, an N peers of NetClientState
were built up.
A new parameter, mq_required were introduce in tap_open() to create multiqueue
tap fds.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'net/tap-linux.c')
| -rw-r--r-- | net/tap-linux.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/tap-linux.c b/net/tap-linux.c index 3b21662c13..a9531892a6 100644 --- a/net/tap-linux.c +++ b/net/tap-linux.c @@ -36,12 +36,12 @@ #define PATH_NET_TUN "/dev/net/tun" -int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required) +int tap_open(char *ifname, int ifname_size, int *vnet_hdr, + int vnet_hdr_required, int mq_required) { struct ifreq ifr; int fd, ret; int len = sizeof(struct virtio_net_hdr); - int mq_required = 0; TFR(fd = open(PATH_NET_TUN, O_RDWR)); if (fd < 0) { |