mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 09:41:44 +00:00
b53f35a809
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>
128 lines
2.4 KiB
C
128 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
|
|
* Licensed under the GPL.
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <errno.h>
|
|
#include <libvdeplug.h>
|
|
#include "kern_constants.h"
|
|
#include "net_user.h"
|
|
#include "um_malloc.h"
|
|
#include "user.h"
|
|
#include "vde.h"
|
|
|
|
static int vde_user_init(void *data, void *dev)
|
|
{
|
|
struct vde_data *pri = data;
|
|
VDECONN *conn = NULL;
|
|
int err = -EINVAL;
|
|
|
|
pri->dev = dev;
|
|
|
|
conn = vde_open(pri->vde_switch, pri->descr, pri->args);
|
|
|
|
if (conn == NULL) {
|
|
err = -errno;
|
|
printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
|
|
"errno = %d\n", errno);
|
|
return err;
|
|
}
|
|
|
|
printk(UM_KERN_INFO "vde backend - connection opened\n");
|
|
|
|
pri->conn = conn;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vde_user_open(void *data)
|
|
{
|
|
struct vde_data *pri = data;
|
|
|
|
if (pri->conn != NULL)
|
|
return vde_datafd(pri->conn);
|
|
|
|
printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void vde_remove(void *data)
|
|
{
|
|
struct vde_data *pri = data;
|
|
|
|
if (pri->conn != NULL) {
|
|
printk(UM_KERN_INFO "vde backend - closing connection\n");
|
|
vde_close(pri->conn);
|
|
pri->conn = NULL;
|
|
kfree(pri->args);
|
|
pri->args = NULL;
|
|
return;
|
|
}
|
|
|
|
printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
|
|
}
|
|
|
|
const struct net_user_info vde_user_info = {
|
|
.init = vde_user_init,
|
|
.open = vde_user_open,
|
|
.close = NULL,
|
|
.remove = vde_remove,
|
|
.add_address = NULL,
|
|
.delete_address = NULL,
|
|
.mtu = ETH_MAX_PACKET,
|
|
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
|
|
};
|
|
|
|
void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
|
|
{
|
|
struct vde_open_args *args;
|
|
|
|
vpri->args = kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
|
|
if (vpri->args == NULL) {
|
|
printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args"
|
|
"allocation failed");
|
|
return;
|
|
}
|
|
|
|
args = vpri->args;
|
|
|
|
args->port = init->port;
|
|
args->group = init->group;
|
|
args->mode = init->mode ? init->mode : 0700;
|
|
|
|
args->port ? printk(UM_KERN_INFO "port %d", args->port) :
|
|
printk(UM_KERN_INFO "undefined port");
|
|
}
|
|
|
|
int vde_user_read(void *conn, void *buf, int len)
|
|
{
|
|
VDECONN *vconn = conn;
|
|
int rv;
|
|
|
|
if (vconn == NULL)
|
|
return 0;
|
|
|
|
rv = vde_recv(vconn, buf, len, 0);
|
|
if (rv < 0) {
|
|
if (errno == EAGAIN)
|
|
return 0;
|
|
return -errno;
|
|
}
|
|
else if (rv == 0)
|
|
return -ENOTCONN;
|
|
|
|
return rv;
|
|
}
|
|
|
|
int vde_user_write(void *conn, void *buf, int len)
|
|
{
|
|
VDECONN *vconn = conn;
|
|
|
|
if (vconn == NULL)
|
|
return 0;
|
|
|
|
return vde_send(vconn, buf, len, 0);
|
|
}
|
|
|