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>
diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
index d78f324..5f06204 100644
--- a/arch/um/drivers/slip_user.c
+++ b/arch/um/drivers/slip_user.c
@@ -230,11 +230,6 @@
return slip_proto_write(fd, buf, len, &pri->slip);
}
-static int slip_set_mtu(int mtu, void *data)
-{
- return mtu;
-}
-
static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
void *data)
{
@@ -260,8 +255,8 @@
.open = slip_open,
.close = slip_close,
.remove = NULL,
- .set_mtu = slip_set_mtu,
.add_address = slip_add_addr,
.delete_address = slip_del_addr,
- .max_packet = BUF_SIZE
+ .mtu = BUF_SIZE,
+ .max_packet = BUF_SIZE,
};