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authorJeff Dike <jdike@addtoit.com>2007-10-16 01:27:31 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:08 -0700
commitb53f35a8093e6aed7e8e880eaa0b89a3d2fdfb0a (patch)
tree50e19688753650e27b1f7fc1d48eb8683666e6b7 /arch/um/drivers/vde_kern.c
parentcd1ae0e49bdd814cfaa2e5ab28cff21a30e20085 (diff)
uml: network driver MTU cleanups
A bunch of MTU-related cleanups in the network code. First, there is the addition of the notion of a maximally-sized packet, which is the MTU plus headers. This is used to size the skb that will receive a packet. This allows ether_adjust_skb to go away, as it was used to resize the skb after it was allocated. Since the skb passed into the low-level read routine is no longer resized, and possibly reallocated, there, they (and the write routines) don't need to get an sk_buff **. They just need the sk_buff * now. The callers of ether_adjust_skb still need to do the skb_put, so that's now inlined. The MAX_PACKET definitions in most of the drivers are gone. The set_mtu methods were all the same and did nothing, so they can be removed. The ethertap driver had a typo which doubled the size of the packet rather than adding two bytes to it. It also wasn't defining its setup_size, causing a zero-byte kmalloc and crash when the invalid pointer returned from kmalloc was dereferenced. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/drivers/vde_kern.c')
-rw-r--r--arch/um/drivers/vde_kern.c19
1 files changed, 7 insertions, 12 deletions
diff --git a/arch/um/drivers/vde_kern.c b/arch/um/drivers/vde_kern.c
index c5d01685d2b..add7e722def 100644
--- a/arch/um/drivers/vde_kern.c
+++ b/arch/um/drivers/vde_kern.c
@@ -36,30 +36,25 @@ static void vde_init(struct net_device *dev, void *data)
printk("\n");
}
-static int vde_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
struct vde_data *pri = (struct vde_data *) &lp->user;
- if (pri->conn != NULL) {
- *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
- if (*skb == NULL)
- return -ENOMEM;
-
- return vde_user_read(pri->conn, skb_mac_header(*skb),
- (*skb)->dev->mtu + ETH_HEADER_OTHER);
- }
+ if (pri->conn != NULL)
+ return vde_user_read(pri->conn, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
printk(KERN_ERR "vde_read - we have no VDECONN to read from");
return -EBADF;
}
-static int vde_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
struct vde_data *pri = (struct vde_data *) &lp->user;
if (pri->conn != NULL)
- return vde_user_write((void *)pri->conn, (*skb)->data,
- (*skb)->len);
+ return vde_user_write((void *)pri->conn, skb->data,
+ skb->len);
printk(KERN_ERR "vde_write - we have no VDECONN to write to");
return -EBADF;