From b53f35a8093e6aed7e8e880eaa0b89a3d2fdfb0a Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Tue, 16 Oct 2007 01:27:31 -0700 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/os-Linux/drivers/tuntap_user.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) (limited to 'arch/um/os-Linux/drivers/tuntap_user.c') diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c index 10714a413cfd..6c55d3c8ead8 100644 --- a/arch/um/os-Linux/drivers/tuntap_user.c +++ b/arch/um/os-Linux/drivers/tuntap_user.c @@ -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, }; -- cgit v1.2.3-59-g8ed1b