Revision fe0e5c4d947d34f10002b4cf272f0ebf110305b7 authored by Andrew Morton on 22 December 2006, 09:11:36 UTC, committed by Linus Torvalds on 22 December 2006, 16:55:51 UTC
Linus sayeth: Google knows everything, and finds, on MS own site no less: "Windows 2000 default resources: One 4K memory window One 2 MB memory window Two 256-byte I/O windows" which is clearly utterly bogus and insufficient. But Microsoft apparently realized this, and: "Windows XP default resources: Because one memory window of 4K and one window of 2 MB are not sufficient for CardBus controllers in many configurations, Windows XP allocates larger memory windows to CardBus controllers where possible. However, resource windows are static (that is, the operating system does not dynamically allocate larger memory windows if new devices appear.) Under Windows XP, CardBus controllers will be assigned the following resources: One 4K memory window, as in Windows 2000 64 MB memory, if that amount of memory is available. If 64 MB is not available the controller will receive 32 MB; if 32 MB is not available, the controller will receive 16 MB; if 16 MB is not available, the bridge will receive 8 MB; and so on down to a minimum assignment of 1 MB in configurations where memory is too constrained for the operating system to provide a larger window. Two 256-byte I/O windows" So I think we have our answer. Windows uses one 4k window, and one 64MB window. And they are no more dynamic than we are (we _could_ try to do it dynamically, but let's face it, it's fairly painful to dynamically expand PCI bus resources - you may need to reprogram everything up to the root, so it would be absolutely crazy to do that unless you have some serious masochistic tendencies). So let's just increase our default value to 64M too. Cc: Markus Rechberger <mrechberger@gmail.com> Cc: Daniel Ritz <daniel.ritz@gmx.ch> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent 192636a
x25_in.c
/*
* X.25 Packet Layer release 002
*
* This is ALPHA test software. This code may break your machine,
* randomly fail to work with new releases, misbehave and/or generally
* screw up. It might even work.
*
* This code REQUIRES 2.1.15 or higher
*
* This module:
* This module is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* History
* X.25 001 Jonathan Naylor Started coding.
* X.25 002 Jonathan Naylor Centralised disconnection code.
* New timer architecture.
* 2000-03-20 Daniela Squassoni Disabling/enabling of facilities
* negotiation.
* 2000-11-10 Henner Eisen Check and reset for out-of-sequence
* i-frames.
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/x25.h>
static int x25_queue_rx_frame(struct sock *sk, struct sk_buff *skb, int more)
{
struct sk_buff *skbo, *skbn = skb;
struct x25_sock *x25 = x25_sk(sk);
if (more) {
x25->fraglen += skb->len;
skb_queue_tail(&x25->fragment_queue, skb);
skb_set_owner_r(skb, sk);
return 0;
}
if (!more && x25->fraglen > 0) { /* End of fragment */
int len = x25->fraglen + skb->len;
if ((skbn = alloc_skb(len, GFP_ATOMIC)) == NULL){
kfree_skb(skb);
return 1;
}
skb_queue_tail(&x25->fragment_queue, skb);
skbn->h.raw = skbn->data;
skbo = skb_dequeue(&x25->fragment_queue);
memcpy(skb_put(skbn, skbo->len), skbo->data, skbo->len);
kfree_skb(skbo);
while ((skbo =
skb_dequeue(&x25->fragment_queue)) != NULL) {
skb_pull(skbo, (x25->neighbour->extended) ?
X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
memcpy(skb_put(skbn, skbo->len), skbo->data, skbo->len);
kfree_skb(skbo);
}
x25->fraglen = 0;
}
skb_set_owner_r(skbn, sk);
skb_queue_tail(&sk->sk_receive_queue, skbn);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_data_ready(sk, skbn->len);
return 0;
}
/*
* State machine for state 1, Awaiting Call Accepted State.
* The handling of the timer(s) is in file x25_timer.c.
* Handling of state 0 and connection release is in af_x25.c.
*/
static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
struct x25_address source_addr, dest_addr;
switch (frametype) {
case X25_CALL_ACCEPTED: {
struct x25_sock *x25 = x25_sk(sk);
x25_stop_timer(sk);
x25->condition = 0x00;
x25->vs = 0;
x25->va = 0;
x25->vr = 0;
x25->vl = 0;
x25->state = X25_STATE_3;
sk->sk_state = TCP_ESTABLISHED;
/*
* Parse the data in the frame.
*/
skb_pull(skb, X25_STD_MIN_LEN);
skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
skb_pull(skb,
x25_parse_facilities(skb, &x25->facilities,
&x25->dte_facilities,
&x25->vc_facil_mask));
/*
* Copy any Call User Data.
*/
if (skb->len >= 0) {
memcpy(x25->calluserdata.cuddata, skb->data,
skb->len);
x25->calluserdata.cudlength = skb->len;
}
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_state_change(sk);
break;
}
case X25_CLEAR_REQUEST:
x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
x25_disconnect(sk, ECONNREFUSED, skb->data[3], skb->data[4]);
break;
default:
break;
}
return 0;
}
/*
* State machine for state 2, Awaiting Clear Confirmation State.
* The handling of the timer(s) is in file x25_timer.c
* Handling of state 0 and connection release is in af_x25.c.
*/
static int x25_state2_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
switch (frametype) {
case X25_CLEAR_REQUEST:
x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
x25_disconnect(sk, 0, skb->data[3], skb->data[4]);
break;
case X25_CLEAR_CONFIRMATION:
x25_disconnect(sk, 0, 0, 0);
break;
default:
break;
}
return 0;
}
/*
* State machine for state 3, Connected State.
* The handling of the timer(s) is in file x25_timer.c
* Handling of state 0 and connection release is in af_x25.c.
*/
static int x25_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype, int ns, int nr, int q, int d, int m)
{
int queued = 0;
int modulus;
struct x25_sock *x25 = x25_sk(sk);
modulus = (x25->neighbour->extended) ? X25_EMODULUS : X25_SMODULUS;
switch (frametype) {
case X25_RESET_REQUEST:
x25_write_internal(sk, X25_RESET_CONFIRMATION);
x25_stop_timer(sk);
x25->condition = 0x00;
x25->vs = 0;
x25->vr = 0;
x25->va = 0;
x25->vl = 0;
x25_requeue_frames(sk);
break;
case X25_CLEAR_REQUEST:
x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
x25_disconnect(sk, 0, skb->data[3], skb->data[4]);
break;
case X25_RR:
case X25_RNR:
if (!x25_validate_nr(sk, nr)) {
x25_clear_queues(sk);
x25_write_internal(sk, X25_RESET_REQUEST);
x25_start_t22timer(sk);
x25->condition = 0x00;
x25->vs = 0;
x25->vr = 0;
x25->va = 0;
x25->vl = 0;
x25->state = X25_STATE_4;
} else {
x25_frames_acked(sk, nr);
if (frametype == X25_RNR) {
x25->condition |= X25_COND_PEER_RX_BUSY;
} else {
x25->condition &= ~X25_COND_PEER_RX_BUSY;
}
}
break;
case X25_DATA: /* XXX */
x25->condition &= ~X25_COND_PEER_RX_BUSY;
if ((ns != x25->vr) || !x25_validate_nr(sk, nr)) {
x25_clear_queues(sk);
x25_write_internal(sk, X25_RESET_REQUEST);
x25_start_t22timer(sk);
x25->condition = 0x00;
x25->vs = 0;
x25->vr = 0;
x25->va = 0;
x25->vl = 0;
x25->state = X25_STATE_4;
break;
}
x25_frames_acked(sk, nr);
if (ns == x25->vr) {
if (x25_queue_rx_frame(sk, skb, m) == 0) {
x25->vr = (x25->vr + 1) % modulus;
queued = 1;
} else {
/* Should never happen */
x25_clear_queues(sk);
x25_write_internal(sk, X25_RESET_REQUEST);
x25_start_t22timer(sk);
x25->condition = 0x00;
x25->vs = 0;
x25->vr = 0;
x25->va = 0;
x25->vl = 0;
x25->state = X25_STATE_4;
break;
}
if (atomic_read(&sk->sk_rmem_alloc) >
(sk->sk_rcvbuf / 2))
x25->condition |= X25_COND_OWN_RX_BUSY;
}
/*
* If the window is full Ack it immediately, else
* start the holdback timer.
*/
if (((x25->vl + x25->facilities.winsize_in) % modulus) == x25->vr) {
x25->condition &= ~X25_COND_ACK_PENDING;
x25_stop_timer(sk);
x25_enquiry_response(sk);
} else {
x25->condition |= X25_COND_ACK_PENDING;
x25_start_t2timer(sk);
}
break;
case X25_INTERRUPT_CONFIRMATION:
x25->intflag = 0;
break;
case X25_INTERRUPT:
if (sock_flag(sk, SOCK_URGINLINE))
queued = !sock_queue_rcv_skb(sk, skb);
else {
skb_set_owner_r(skb, sk);
skb_queue_tail(&x25->interrupt_in_queue, skb);
queued = 1;
}
sk_send_sigurg(sk);
x25_write_internal(sk, X25_INTERRUPT_CONFIRMATION);
break;
default:
printk(KERN_WARNING "x25: unknown %02X in state 3\n", frametype);
break;
}
return queued;
}
/*
* State machine for state 4, Awaiting Reset Confirmation State.
* The handling of the timer(s) is in file x25_timer.c
* Handling of state 0 and connection release is in af_x25.c.
*/
static int x25_state4_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
switch (frametype) {
case X25_RESET_REQUEST:
x25_write_internal(sk, X25_RESET_CONFIRMATION);
case X25_RESET_CONFIRMATION: {
struct x25_sock *x25 = x25_sk(sk);
x25_stop_timer(sk);
x25->condition = 0x00;
x25->va = 0;
x25->vr = 0;
x25->vs = 0;
x25->vl = 0;
x25->state = X25_STATE_3;
x25_requeue_frames(sk);
break;
}
case X25_CLEAR_REQUEST:
x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
x25_disconnect(sk, 0, skb->data[3], skb->data[4]);
break;
default:
break;
}
return 0;
}
/* Higher level upcall for a LAPB frame */
int x25_process_rx_frame(struct sock *sk, struct sk_buff *skb)
{
struct x25_sock *x25 = x25_sk(sk);
int queued = 0, frametype, ns, nr, q, d, m;
if (x25->state == X25_STATE_0)
return 0;
frametype = x25_decode(sk, skb, &ns, &nr, &q, &d, &m);
switch (x25->state) {
case X25_STATE_1:
queued = x25_state1_machine(sk, skb, frametype);
break;
case X25_STATE_2:
queued = x25_state2_machine(sk, skb, frametype);
break;
case X25_STATE_3:
queued = x25_state3_machine(sk, skb, frametype, ns, nr, q, d, m);
break;
case X25_STATE_4:
queued = x25_state4_machine(sk, skb, frametype);
break;
}
x25_kick(sk);
return queued;
}
int x25_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
int queued = x25_process_rx_frame(sk, skb);
if (!queued)
kfree_skb(skb);
return 0;
}
Computing file changes ...
