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authorMichael S. Tsirkin <mst@redhat.com>2010-04-29 13:50:48 +0300
committerMichael S. Tsirkin <mst@redhat.com>2010-05-04 01:35:47 +0300
commit55afbd0810922afe456f9e4e3abc84d69d3f8a15 (patch)
tree73e38287a8d81b1b03fc72d0693a66aa0a18f7a5 /drivers/net/macvtap.c
parentd9d52b5178af586d679c1052fb161ee05ea2e83f (diff)
macvtap: add ioctl to modify vnet header size
This adds TUNSETVNETHDRSZ/TUNGETVNETHDRSZ support to macvtap. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvtap.c')
-rw-r--r--drivers/net/macvtap.c27
1 files changed, 23 insertions, 4 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 1c4110df343e..a8a94e2f6ddc 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -38,6 +38,7 @@ struct macvtap_queue {
struct sock sk;
struct socket sock;
struct socket_wq wq;
+ int vnet_hdr_sz;
struct macvlan_dev *vlan;
struct file *file;
unsigned int flags;
@@ -285,6 +286,7 @@ static int macvtap_open(struct inode *inode, struct file *file)
sock_init_data(&q->sock, &q->sk);
q->sk.sk_write_space = macvtap_sock_write_space;
q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
+ q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
err = macvtap_set_queue(dev, file, q);
if (err)
@@ -445,14 +447,14 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q,
int vnet_hdr_len = 0;
if (q->flags & IFF_VNET_HDR) {
- vnet_hdr_len = sizeof(vnet_hdr);
+ vnet_hdr_len = q->vnet_hdr_sz;
err = -EINVAL;
if ((len -= vnet_hdr_len) < 0)
goto err;
err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0,
- vnet_hdr_len);
+ sizeof(vnet_hdr));
if (err < 0)
goto err;
if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
@@ -534,7 +536,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
if (q->flags & IFF_VNET_HDR) {
struct virtio_net_hdr vnet_hdr;
- vnet_hdr_len = sizeof (vnet_hdr);
+ vnet_hdr_len = q->vnet_hdr_sz;
if ((len -= vnet_hdr_len) < 0)
return -EINVAL;
@@ -542,7 +544,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
if (ret)
return ret;
- if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, vnet_hdr_len))
+ if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr)))
return -EFAULT;
}
@@ -627,6 +629,8 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
struct ifreq __user *ifr = argp;
unsigned int __user *up = argp;
unsigned int u;
+ int __user *sp = argp;
+ int s;
int ret;
switch (cmd) {
@@ -672,6 +676,21 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
q->sk.sk_sndbuf = u;
return 0;
+ case TUNGETVNETHDRSZ:
+ s = q->vnet_hdr_sz;
+ if (put_user(s, sp))
+ return -EFAULT;
+ return 0;
+
+ case TUNSETVNETHDRSZ:
+ if (get_user(s, sp))
+ return -EFAULT;
+ if (s < (int)sizeof(struct virtio_net_hdr))
+ return -EINVAL;
+
+ q->vnet_hdr_sz = s;
+ return 0;
+
case TUNSETOFFLOAD:
/* let the user check for future flags */
if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |