ia64/linux-2.6.18-xen.hg

view net/rose/rose_link.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.h>
12 #include <linux/in.h>
13 #include <linux/kernel.h>
14 #include <linux/jiffies.h>
15 #include <linux/timer.h>
16 #include <linux/string.h>
17 #include <linux/sockios.h>
18 #include <linux/net.h>
19 #include <net/ax25.h>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
23 #include <net/sock.h>
24 #include <asm/system.h>
25 #include <linux/fcntl.h>
26 #include <linux/mm.h>
27 #include <linux/interrupt.h>
28 #include <linux/netfilter.h>
29 #include <net/rose.h>
31 static void rose_ftimer_expiry(unsigned long);
32 static void rose_t0timer_expiry(unsigned long);
34 static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
35 static void rose_transmit_restart_request(struct rose_neigh *neigh);
37 void rose_start_ftimer(struct rose_neigh *neigh)
38 {
39 del_timer(&neigh->ftimer);
41 neigh->ftimer.data = (unsigned long)neigh;
42 neigh->ftimer.function = &rose_ftimer_expiry;
43 neigh->ftimer.expires =
44 jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
46 add_timer(&neigh->ftimer);
47 }
49 static void rose_start_t0timer(struct rose_neigh *neigh)
50 {
51 del_timer(&neigh->t0timer);
53 neigh->t0timer.data = (unsigned long)neigh;
54 neigh->t0timer.function = &rose_t0timer_expiry;
55 neigh->t0timer.expires =
56 jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
58 add_timer(&neigh->t0timer);
59 }
61 void rose_stop_ftimer(struct rose_neigh *neigh)
62 {
63 del_timer(&neigh->ftimer);
64 }
66 void rose_stop_t0timer(struct rose_neigh *neigh)
67 {
68 del_timer(&neigh->t0timer);
69 }
71 int rose_ftimer_running(struct rose_neigh *neigh)
72 {
73 return timer_pending(&neigh->ftimer);
74 }
76 static int rose_t0timer_running(struct rose_neigh *neigh)
77 {
78 return timer_pending(&neigh->t0timer);
79 }
81 static void rose_ftimer_expiry(unsigned long param)
82 {
83 }
85 static void rose_t0timer_expiry(unsigned long param)
86 {
87 struct rose_neigh *neigh = (struct rose_neigh *)param;
89 rose_transmit_restart_request(neigh);
91 neigh->dce_mode = 0;
93 rose_start_t0timer(neigh);
94 }
96 /*
97 * Interface to ax25_send_frame. Changes my level 2 callsign depending
98 * on whether we have a global ROSE callsign or use the default port
99 * callsign.
100 */
101 static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
102 {
103 ax25_address *rose_call;
105 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
106 rose_call = (ax25_address *)neigh->dev->dev_addr;
107 else
108 rose_call = &rose_callsign;
110 neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
112 return (neigh->ax25 != NULL);
113 }
115 /*
116 * Interface to ax25_link_up. Changes my level 2 callsign depending
117 * on whether we have a global ROSE callsign or use the default port
118 * callsign.
119 */
120 static int rose_link_up(struct rose_neigh *neigh)
121 {
122 ax25_address *rose_call;
124 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
125 rose_call = (ax25_address *)neigh->dev->dev_addr;
126 else
127 rose_call = &rose_callsign;
129 neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
131 return (neigh->ax25 != NULL);
132 }
134 /*
135 * This handles all restart and diagnostic frames.
136 */
137 void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
138 {
139 struct sk_buff *skbn;
141 switch (frametype) {
142 case ROSE_RESTART_REQUEST:
143 rose_stop_t0timer(neigh);
144 neigh->restarted = 1;
145 neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED);
146 rose_transmit_restart_confirmation(neigh);
147 break;
149 case ROSE_RESTART_CONFIRMATION:
150 rose_stop_t0timer(neigh);
151 neigh->restarted = 1;
152 break;
154 case ROSE_DIAGNOSTIC:
155 printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
156 break;
158 default:
159 printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
160 break;
161 }
163 if (neigh->restarted) {
164 while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
165 if (!rose_send_frame(skbn, neigh))
166 kfree_skb(skbn);
167 }
168 }
170 /*
171 * This routine is called when a Restart Request is needed
172 */
173 static void rose_transmit_restart_request(struct rose_neigh *neigh)
174 {
175 struct sk_buff *skb;
176 unsigned char *dptr;
177 int len;
179 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
181 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
182 return;
184 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
186 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
188 *dptr++ = AX25_P_ROSE;
189 *dptr++ = ROSE_GFI;
190 *dptr++ = 0x00;
191 *dptr++ = ROSE_RESTART_REQUEST;
192 *dptr++ = ROSE_DTE_ORIGINATED;
193 *dptr++ = 0;
195 if (!rose_send_frame(skb, neigh))
196 kfree_skb(skb);
197 }
199 /*
200 * This routine is called when a Restart Confirmation is needed
201 */
202 static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
203 {
204 struct sk_buff *skb;
205 unsigned char *dptr;
206 int len;
208 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
210 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
211 return;
213 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
215 dptr = skb_put(skb, ROSE_MIN_LEN + 1);
217 *dptr++ = AX25_P_ROSE;
218 *dptr++ = ROSE_GFI;
219 *dptr++ = 0x00;
220 *dptr++ = ROSE_RESTART_CONFIRMATION;
222 if (!rose_send_frame(skb, neigh))
223 kfree_skb(skb);
224 }
226 /*
227 * This routine is called when a Clear Request is needed outside of the context
228 * of a connected socket.
229 */
230 void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
231 {
232 struct sk_buff *skb;
233 unsigned char *dptr;
234 int len;
236 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
238 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
239 return;
241 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
243 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
245 *dptr++ = AX25_P_ROSE;
246 *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
247 *dptr++ = ((lci >> 0) & 0xFF);
248 *dptr++ = ROSE_CLEAR_REQUEST;
249 *dptr++ = cause;
250 *dptr++ = diagnostic;
252 if (!rose_send_frame(skb, neigh))
253 kfree_skb(skb);
254 }
256 void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
257 {
258 unsigned char *dptr;
260 #if 0
261 if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
262 kfree_skb(skb);
263 return;
264 }
265 #endif
267 if (neigh->loopback) {
268 rose_loopback_queue(skb, neigh);
269 return;
270 }
272 if (!rose_link_up(neigh))
273 neigh->restarted = 0;
275 dptr = skb_push(skb, 1);
276 *dptr++ = AX25_P_ROSE;
278 if (neigh->restarted) {
279 if (!rose_send_frame(skb, neigh))
280 kfree_skb(skb);
281 } else {
282 skb_queue_tail(&neigh->queue, skb);
284 if (!rose_t0timer_running(neigh)) {
285 rose_transmit_restart_request(neigh);
286 neigh->dce_mode = 0;
287 rose_start_t0timer(neigh);
288 }
289 }
290 }