Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  1 
  2 #ifdef CONFIG_PROC_FS
  3 #include <linux/errno.h>
  4 #include <linux/kernel.h>
  5 #include <linux/string.h>
  6 #include <linux/mm.h>
  7 #include <linux/module.h>
  8 #include <linux/proc_fs.h>
  9 #include <linux/time.h>
 10 #include <linux/seq_file.h>
 11 #include <asm/uaccess.h>
 12 #include <linux/atmmpc.h>
 13 #include <linux/atm.h>
 14 #include "mpc.h"
 15 #include "mpoa_caches.h"
 16 
 17 /*
 18  * mpoa_proc.c: Implementation MPOA client's proc
 19  * file system statistics
 20  */
 21 
 22 #if 1
 23 #define dprintk printk   /* debug */
 24 #else
 25 #define dprintk(format,args...)
 26 #endif
 27 
 28 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
 29 
 30 extern struct mpoa_client *mpcs;
 31 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
 32 
 33 static int proc_mpc_open(struct inode *inode, struct file *file);
 34 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 35                               size_t nbytes, loff_t *ppos);
 36 
 37 static int parse_qos(const char *buff);
 38 
 39 /*
 40  *   Define allowed FILE OPERATIONS
 41  */
 42 static const struct file_operations mpc_file_operations = {
 43         .owner =        THIS_MODULE,
 44         .open =         proc_mpc_open,
 45         .read =         seq_read,
 46         .llseek =       seq_lseek,
 47         .write =        proc_mpc_write,
 48         .release =      seq_release,
 49 };
 50 
 51 /*
 52  * Returns the state of an ingress cache entry as a string
 53  */
 54 static const char *ingress_state_string(int state){
 55         switch(state) {
 56         case INGRESS_RESOLVING:
 57                 return "resolving  ";
 58                 break;
 59         case INGRESS_RESOLVED:
 60                 return "resolved   ";
 61                 break;
 62         case INGRESS_INVALID:
 63                 return "invalid    ";
 64                 break;
 65         case INGRESS_REFRESHING:
 66                 return "refreshing ";
 67                 break;
 68         default:
 69                return "";
 70         }
 71 }
 72 
 73 /*
 74  * Returns the state of an egress cache entry as a string
 75  */
 76 static const char *egress_state_string(int state){
 77         switch(state) {
 78         case EGRESS_RESOLVED:
 79                 return "resolved   ";
 80                 break;
 81         case EGRESS_PURGE:
 82                 return "purge      ";
 83                 break;
 84         case EGRESS_INVALID:
 85                 return "invalid    ";
 86                 break;
 87         default:
 88                return "";
 89         }
 90 }
 91 
 92 /*
 93  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
 94  */
 95 
 96 static void *mpc_start(struct seq_file *m, loff_t *pos)
 97 {
 98         loff_t l = *pos;
 99         struct mpoa_client *mpc;
100 
101         if (!l--)
102                 return SEQ_START_TOKEN;
103         for (mpc = mpcs; mpc; mpc = mpc->next)
104                 if (!l--)
105                         return mpc;
106         return NULL;
107 }
108 
109 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
110 {
111         struct mpoa_client *p = v;
112         (*pos)++;
113         return v == SEQ_START_TOKEN ? mpcs : p->next;
114 }
115 
116 static void mpc_stop(struct seq_file *m, void *v)
117 {
118 }
119 
120 /*
121  * READING function - called when the /proc/atm/mpoa file is read from.
122  */
123 static int mpc_show(struct seq_file *m, void *v)
124 {
125         struct mpoa_client *mpc = v;
126         unsigned char *temp;
127         int i;
128         in_cache_entry *in_entry;
129         eg_cache_entry *eg_entry;
130         struct timeval now;
131         unsigned char ip_string[16];
132 
133         if (v == SEQ_START_TOKEN) {
134                 atm_mpoa_disp_qos(m);
135                 return 0;
136         }
137 
138         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
139         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
140         do_gettimeofday(&now);
141 
142         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
143                 temp = (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
144                 sprintf(ip_string,"%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
145                 seq_printf(m, "%-16s%s%-14lu%-12u",
146                               ip_string,
147                               ingress_state_string(in_entry->entry_state),
148                               in_entry->ctrl_info.holding_time-(now.tv_sec-in_entry->tv.tv_sec),
149                               in_entry->packets_fwded);
150                 if (in_entry->shortcut)
151                         seq_printf(m, "   %-3d  %-3d",in_entry->shortcut->vpi,in_entry->shortcut->vci);
152                 seq_printf(m, "\n");
153         }
154 
155         seq_printf(m, "\n");
156         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
157         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
158                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
159                 for(i = 0; i < ATM_ESA_LEN; i++)
160                         seq_printf(m, "%02x", p[i]);
161                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
162                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
163                            egress_state_string(eg_entry->entry_state),
164                            (eg_entry->ctrl_info.holding_time-(now.tv_sec-eg_entry->tv.tv_sec)),
165                            eg_entry->packets_rcvd);
166 
167                 /* latest IP address */
168                 temp = (unsigned char *)&eg_entry->latest_ip_addr;
169                 sprintf(ip_string, "%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
170                 seq_printf(m, "%-16s", ip_string);
171 
172                 if (eg_entry->shortcut)
173                         seq_printf(m, " %-3d %-3d",eg_entry->shortcut->vpi,eg_entry->shortcut->vci);
174                 seq_printf(m, "\n");
175         }
176         seq_printf(m, "\n");
177         return 0;
178 }
179 
180 static const struct seq_operations mpc_op = {
181         .start =        mpc_start,
182         .next =         mpc_next,
183         .stop =         mpc_stop,
184         .show =         mpc_show
185 };
186 
187 static int proc_mpc_open(struct inode *inode, struct file *file)
188 {
189         return seq_open(file, &mpc_op);
190 }
191 
192 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
193                               size_t nbytes, loff_t *ppos)
194 {
195         char *page, *p;
196         unsigned len;
197 
198         if (nbytes == 0)
199                 return 0;
200 
201         if (nbytes >= PAGE_SIZE)
202                 nbytes = PAGE_SIZE-1;
203 
204         page = (char *)__get_free_page(GFP_KERNEL);
205         if (!page)
206                 return -ENOMEM;
207 
208         for (p = page, len = 0; len < nbytes; p++, len++) {
209                 if (get_user(*p, buff++)) {
210                         free_page((unsigned long)page);
211                         return -EFAULT;
212                 }
213                 if (*p == '\0' || *p == '\n')
214                         break;
215         }
216 
217         *p = '\0';
218 
219         if (!parse_qos(page))
220                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
221 
222         free_page((unsigned long)page);
223 
224         return len;
225 }
226 
227 static int parse_qos(const char *buff)
228 {
229         /* possible lines look like this
230          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
231          */
232         unsigned char ip[4];
233         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
234         __be32 ipaddr;
235         struct atm_qos qos;
236 
237         memset(&qos, 0, sizeof(struct atm_qos));
238 
239         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
240                         ip, ip+1, ip+2, ip+3) == 4) {
241                 ipaddr = *(__be32 *)ip;
242                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
243         }
244 
245         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
246                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
247                 rx_pcr = tx_pcr;
248                 rx_sdu = tx_sdu;
249         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
250                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
251                 return 0;
252 
253         ipaddr = *(__be32 *)ip;
254         qos.txtp.traffic_class = ATM_CBR;
255         qos.txtp.max_pcr = tx_pcr;
256         qos.txtp.max_sdu = tx_sdu;
257         qos.rxtp.traffic_class = ATM_CBR;
258         qos.rxtp.max_pcr = rx_pcr;
259         qos.rxtp.max_sdu = rx_sdu;
260         qos.aal = ATM_AAL5;
261         dprintk("mpoa: mpoa_proc.c: parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
262                 qos.txtp.max_pcr,
263                 qos.txtp.max_sdu,
264                 qos.rxtp.max_pcr,
265                 qos.rxtp.max_sdu
266                 );
267 
268         atm_mpoa_add_qos(ipaddr, &qos);
269         return 1;
270 }
271 
272 /*
273  * INITIALIZATION function - called when module is initialized/loaded.
274  */
275 int mpc_proc_init(void)
276 {
277         struct proc_dir_entry *p;
278 
279         p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
280         if (!p) {
281                 printk(KERN_ERR "Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
282                 return -ENOMEM;
283         }
284         p->owner = THIS_MODULE;
285         return 0;
286 }
287 
288 /*
289  * DELETING function - called when module is removed.
290  */
291 void mpc_proc_clean(void)
292 {
293         remove_proc_entry(STAT_FILE_NAME,atm_proc_root);
294 }
295 
296 
297 #endif /* CONFIG_PROC_FS */
298 
299 
300 
301 
302 
303 
304 
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