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uml: network driver MTU cleanups

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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>
This commit is contained in:
Jeff Dike
2007-10-16 01:27:31 -07:00
committed by Linus Torvalds
parent cd1ae0e49b
commit b53f35a809
19 changed files with 80 additions and 188 deletions
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11
arch/um/os-Linux/drivers/tuntap_user.c
View File

@ -18,8 +18,6 @@
#include "tuntap.h"
#include "user.h"
#define MAX_PACKET ETH_MAX_PACKET
static int tuntap_user_init(void *data, void *dev)
{
struct tuntap_data *pri = data;
@ -206,18 +204,13 @@ static void tuntap_close(int fd, void *data)
pri->fd = -1;
}
static int tuntap_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info tuntap_user_info = {
.init = tuntap_user_init,
.open = tuntap_open,
.close = tuntap_close,
.remove = NULL,
.set_mtu = tuntap_set_mtu,
.add_address = tuntap_add_addr,
.delete_address = tuntap_del_addr,
.max_packet = MAX_PACKET
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
};