uml: network driver MTU cleanups
commitb53f35a8093e6aed7e8e880eaa0b89a3d2fdfb0a
authorJeff Dike <jdike@addtoit.com>
Tue, 16 Oct 2007 08:27:31 +0000 (16 01:27 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 16 Oct 2007 16:43:08 +0000 (16 09:43 -0700)
tree50e19688753650e27b1f7fc1d48eb8683666e6b7
parentcd1ae0e49bdd814cfaa2e5ab28cff21a30e20085
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>
19 files changed:
arch/um/drivers/daemon_kern.c
arch/um/drivers/daemon_user.c
arch/um/drivers/mcast_kern.c
arch/um/drivers/mcast_user.c
arch/um/drivers/net_kern.c
arch/um/drivers/pcap_kern.c
arch/um/drivers/pcap_user.c
arch/um/drivers/slip_kern.c
arch/um/drivers/slip_user.c
arch/um/drivers/slirp_kern.c
arch/um/drivers/slirp_user.c
arch/um/drivers/vde_kern.c
arch/um/drivers/vde_user.c
arch/um/include/net_kern.h
arch/um/include/net_user.h
arch/um/os-Linux/drivers/ethertap_kern.c
arch/um/os-Linux/drivers/ethertap_user.c
arch/um/os-Linux/drivers/tuntap_kern.c
arch/um/os-Linux/drivers/tuntap_user.c