caif: Bugfix for socket priority, bindtodev and dbg channel.
[linux-3.10.git] / net / caif / cfcnfg.c
1 /*
2  * Copyright (C) ST-Ericsson AB 2010
3  * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
4  * License terms: GNU General Public License (GPL) version 2
5  */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8
9 #include <linux/kernel.h>
10 #include <linux/stddef.h>
11 #include <linux/slab.h>
12 #include <linux/netdevice.h>
13 #include <net/caif/caif_layer.h>
14 #include <net/caif/cfpkt.h>
15 #include <net/caif/cfcnfg.h>
16 #include <net/caif/cfctrl.h>
17 #include <net/caif/cfmuxl.h>
18 #include <net/caif/cffrml.h>
19 #include <net/caif/cfserl.h>
20 #include <net/caif/cfsrvl.h>
21
22 #include <linux/module.h>
23 #include <asm/atomic.h>
24
25 #define MAX_PHY_LAYERS 7
26 #define PHY_NAME_LEN 20
27
28 #define container_obj(layr) container_of(layr, struct cfcnfg, layer)
29 #define RFM_FRAGMENT_SIZE 4030
30
31 /* Information about CAIF physical interfaces held by Config Module in order
32  * to manage physical interfaces
33  */
34 struct cfcnfg_phyinfo {
35         /* Pointer to the layer below the MUX (framing layer) */
36         struct cflayer *frm_layer;
37         /* Pointer to the lowest actual physical layer */
38         struct cflayer *phy_layer;
39         /* Unique identifier of the physical interface */
40         unsigned int id;
41         /* Preference of the physical in interface */
42         enum cfcnfg_phy_preference pref;
43
44         /* Reference count, number of channels using the device */
45         int phy_ref_count;
46
47         /* Information about the physical device */
48         struct dev_info dev_info;
49
50         /* Interface index */
51         int ifindex;
52
53         /* Use Start of frame extension */
54         bool use_stx;
55
56         /* Use Start of frame checksum */
57         bool use_fcs;
58 };
59
60 struct cfcnfg {
61         struct cflayer layer;
62         struct cflayer *ctrl;
63         struct cflayer *mux;
64         u8 last_phyid;
65         struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
66 };
67
68 static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
69                              enum cfctrl_srv serv, u8 phyid,
70                              struct cflayer *adapt_layer);
71 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
72 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
73                              struct cflayer *adapt_layer);
74 static void cfctrl_resp_func(void);
75 static void cfctrl_enum_resp(void);
76
77 struct cfcnfg *cfcnfg_create(void)
78 {
79         struct cfcnfg *this;
80         struct cfctrl_rsp *resp;
81         /* Initiate this layer */
82         this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
83         if (!this) {
84                 pr_warn("Out of memory\n");
85                 return NULL;
86         }
87         this->mux = cfmuxl_create();
88         if (!this->mux)
89                 goto out_of_mem;
90         this->ctrl = cfctrl_create();
91         if (!this->ctrl)
92                 goto out_of_mem;
93         /* Initiate response functions */
94         resp = cfctrl_get_respfuncs(this->ctrl);
95         resp->enum_rsp = cfctrl_enum_resp;
96         resp->linkerror_ind = cfctrl_resp_func;
97         resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
98         resp->sleep_rsp = cfctrl_resp_func;
99         resp->wake_rsp = cfctrl_resp_func;
100         resp->restart_rsp = cfctrl_resp_func;
101         resp->radioset_rsp = cfctrl_resp_func;
102         resp->linksetup_rsp = cfcnfg_linkup_rsp;
103         resp->reject_rsp = cfcnfg_reject_rsp;
104
105         this->last_phyid = 1;
106
107         cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
108         layer_set_dn(this->ctrl, this->mux);
109         layer_set_up(this->ctrl, this);
110         return this;
111 out_of_mem:
112         pr_warn("Out of memory\n");
113         kfree(this->mux);
114         kfree(this->ctrl);
115         kfree(this);
116         return NULL;
117 }
118 EXPORT_SYMBOL(cfcnfg_create);
119
120 void cfcnfg_remove(struct cfcnfg *cfg)
121 {
122         if (cfg) {
123                 kfree(cfg->mux);
124                 kfree(cfg->ctrl);
125                 kfree(cfg);
126         }
127 }
128
129 static void cfctrl_resp_func(void)
130 {
131 }
132
133 static void cfctrl_enum_resp(void)
134 {
135 }
136
137 struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
138                                   enum cfcnfg_phy_preference phy_pref)
139 {
140         u16 i;
141
142         /* Try to match with specified preference */
143         for (i = 1; i < MAX_PHY_LAYERS; i++) {
144                 if (cnfg->phy_layers[i].id == i &&
145                      cnfg->phy_layers[i].pref == phy_pref &&
146                      cnfg->phy_layers[i].frm_layer != NULL) {
147                         caif_assert(cnfg->phy_layers != NULL);
148                         caif_assert(cnfg->phy_layers[i].id == i);
149                         return &cnfg->phy_layers[i].dev_info;
150                 }
151         }
152         /* Otherwise just return something */
153         for (i = 1; i < MAX_PHY_LAYERS; i++) {
154                 if (cnfg->phy_layers[i].id == i) {
155                         caif_assert(cnfg->phy_layers != NULL);
156                         caif_assert(cnfg->phy_layers[i].id == i);
157                         return &cnfg->phy_layers[i].dev_info;
158                 }
159         }
160
161         return NULL;
162 }
163
164 static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
165                                                         u8 phyid)
166 {
167         int i;
168         /* Try to match with specified preference */
169         for (i = 0; i < MAX_PHY_LAYERS; i++)
170                 if (cnfg->phy_layers[i].frm_layer != NULL &&
171                     cnfg->phy_layers[i].id == phyid)
172                         return &cnfg->phy_layers[i];
173         return NULL;
174 }
175
176
177 int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
178 {
179         int i;
180         for (i = 0; i < MAX_PHY_LAYERS; i++)
181                 if (cnfg->phy_layers[i].frm_layer != NULL &&
182                                 cnfg->phy_layers[i].ifindex == ifi)
183                         return i;
184         return -ENODEV;
185 }
186
187 int cfcnfg_disconn_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
188 {
189         u8 channel_id = 0;
190         int ret = 0;
191         struct cflayer *servl = NULL;
192         struct cfcnfg_phyinfo *phyinfo = NULL;
193         u8 phyid = 0;
194         caif_assert(adap_layer != NULL);
195         channel_id = adap_layer->id;
196         if (adap_layer->dn == NULL || channel_id == 0) {
197                 pr_err("adap_layer->dn == NULL or adap_layer->id is 0\n");
198                 ret = -ENOTCONN;
199                 goto end;
200         }
201         servl = cfmuxl_remove_uplayer(cnfg->mux, channel_id);
202         if (servl == NULL)
203                 goto end;
204         layer_set_up(servl, NULL);
205         ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
206         if (servl == NULL) {
207                 pr_err("PROTOCOL ERROR - Error removing service_layer Channel_Id(%d)",
208                        channel_id);
209                 ret = -EINVAL;
210                 goto end;
211         }
212         caif_assert(channel_id == servl->id);
213         if (adap_layer->dn != NULL) {
214                 phyid = cfsrvl_getphyid(adap_layer->dn);
215
216                 phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
217                 if (phyinfo == NULL) {
218                         pr_warn("No interface to send disconnect to\n");
219                         ret = -ENODEV;
220                         goto end;
221                 }
222                 if (phyinfo->id != phyid ||
223                         phyinfo->phy_layer->id != phyid ||
224                         phyinfo->frm_layer->id != phyid) {
225                         pr_err("Inconsistency in phy registration\n");
226                         ret = -EINVAL;
227                         goto end;
228                 }
229         }
230         if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
231                 phyinfo->phy_layer != NULL &&
232                 phyinfo->phy_layer->modemcmd != NULL) {
233                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
234                                              _CAIF_MODEMCMD_PHYIF_USELESS);
235         }
236 end:
237         cfsrvl_put(servl);
238         cfctrl_cancel_req(cnfg->ctrl, adap_layer);
239         if (adap_layer->ctrlcmd != NULL)
240                 adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
241         return ret;
242
243 }
244 EXPORT_SYMBOL(cfcnfg_disconn_adapt_layer);
245
246 void cfcnfg_release_adap_layer(struct cflayer *adap_layer)
247 {
248         if (adap_layer->dn)
249                 cfsrvl_put(adap_layer->dn);
250 }
251 EXPORT_SYMBOL(cfcnfg_release_adap_layer);
252
253 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
254 {
255 }
256
257 int protohead[CFCTRL_SRV_MASK] = {
258         [CFCTRL_SRV_VEI] = 4,
259         [CFCTRL_SRV_DATAGRAM] = 7,
260         [CFCTRL_SRV_UTIL] = 4,
261         [CFCTRL_SRV_RFM] = 3,
262         [CFCTRL_SRV_DBG] = 3,
263 };
264
265 int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
266                                 struct cfctrl_link_param *param,
267                                 struct cflayer *adap_layer,
268                                 int *ifindex,
269                                 int *proto_head,
270                                 int *proto_tail)
271 {
272         struct cflayer *frml;
273         if (adap_layer == NULL) {
274                 pr_err("adap_layer is zero\n");
275                 return -EINVAL;
276         }
277         if (adap_layer->receive == NULL) {
278                 pr_err("adap_layer->receive is NULL\n");
279                 return -EINVAL;
280         }
281         if (adap_layer->ctrlcmd == NULL) {
282                 pr_err("adap_layer->ctrlcmd == NULL\n");
283                 return -EINVAL;
284         }
285         frml = cnfg->phy_layers[param->phyid].frm_layer;
286         if (frml == NULL) {
287                 pr_err("Specified PHY type does not exist!\n");
288                 return -ENODEV;
289         }
290         caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
291         caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
292                      param->phyid);
293         caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
294                      param->phyid);
295
296         *ifindex = cnfg->phy_layers[param->phyid].ifindex;
297         *proto_head =
298                 protohead[param->linktype]+
299                 (cnfg->phy_layers[param->phyid].use_stx ? 1 : 0);
300
301         *proto_tail = 2;
302
303         /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
304         cfctrl_enum_req(cnfg->ctrl, param->phyid);
305         return cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
306 }
307 EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
308
309 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
310                              struct cflayer *adapt_layer)
311 {
312         if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
313                 adapt_layer->ctrlcmd(adapt_layer,
314                                      CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
315 }
316
317 static void
318 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
319                  u8 phyid, struct cflayer *adapt_layer)
320 {
321         struct cfcnfg *cnfg = container_obj(layer);
322         struct cflayer *servicel = NULL;
323         struct cfcnfg_phyinfo *phyinfo;
324         struct net_device *netdev;
325
326         if (adapt_layer == NULL) {
327                 pr_debug("link setup response but no client exist, send linkdown back\n");
328                 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
329                 return;
330         }
331
332         caif_assert(cnfg != NULL);
333         caif_assert(phyid != 0);
334         phyinfo = &cnfg->phy_layers[phyid];
335         caif_assert(phyinfo->id == phyid);
336         caif_assert(phyinfo->phy_layer != NULL);
337         caif_assert(phyinfo->phy_layer->id == phyid);
338
339         phyinfo->phy_ref_count++;
340         if (phyinfo->phy_ref_count == 1 &&
341             phyinfo->phy_layer->modemcmd != NULL) {
342                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
343                                              _CAIF_MODEMCMD_PHYIF_USEFULL);
344         }
345         adapt_layer->id = channel_id;
346
347         switch (serv) {
348         case CFCTRL_SRV_VEI:
349                 servicel = cfvei_create(channel_id, &phyinfo->dev_info);
350                 break;
351         case CFCTRL_SRV_DATAGRAM:
352                 servicel = cfdgml_create(channel_id, &phyinfo->dev_info);
353                 break;
354         case CFCTRL_SRV_RFM:
355                 netdev = phyinfo->dev_info.dev;
356                 servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
357                                                 netdev->mtu);
358                 break;
359         case CFCTRL_SRV_UTIL:
360                 servicel = cfutill_create(channel_id, &phyinfo->dev_info);
361                 break;
362         case CFCTRL_SRV_VIDEO:
363                 servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
364                 break;
365         case CFCTRL_SRV_DBG:
366                 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
367                 break;
368         default:
369                 pr_err("Protocol error. Link setup response - unknown channel type\n");
370                 return;
371         }
372         if (!servicel) {
373                 pr_warn("Out of memory\n");
374                 return;
375         }
376         layer_set_dn(servicel, cnfg->mux);
377         cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
378         layer_set_up(servicel, adapt_layer);
379         layer_set_dn(adapt_layer, servicel);
380         cfsrvl_get(servicel);
381         servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
382 }
383
384 void
385 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
386                      struct net_device *dev, struct cflayer *phy_layer,
387                      u16 *phyid, enum cfcnfg_phy_preference pref,
388                      bool fcs, bool stx)
389 {
390         struct cflayer *frml;
391         struct cflayer *phy_driver = NULL;
392         int i;
393
394
395         if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
396                 *phyid = cnfg->last_phyid;
397
398                 /* range: * 1..(MAX_PHY_LAYERS-1) */
399                 cnfg->last_phyid =
400                     (cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
401         } else {
402                 *phyid = 0;
403                 for (i = 1; i < MAX_PHY_LAYERS; i++) {
404                         if (cnfg->phy_layers[i].frm_layer == NULL) {
405                                 *phyid = i;
406                                 break;
407                         }
408                 }
409         }
410         if (*phyid == 0) {
411                 pr_err("No Available PHY ID\n");
412                 return;
413         }
414
415         switch (phy_type) {
416         case CFPHYTYPE_FRAG:
417                 phy_driver =
418                     cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
419                 if (!phy_driver) {
420                         pr_warn("Out of memory\n");
421                         return;
422                 }
423
424                 break;
425         case CFPHYTYPE_CAIF:
426                 phy_driver = NULL;
427                 break;
428         default:
429                 pr_err("%d\n", phy_type);
430                 return;
431                 break;
432         }
433
434         phy_layer->id = *phyid;
435         cnfg->phy_layers[*phyid].pref = pref;
436         cnfg->phy_layers[*phyid].id = *phyid;
437         cnfg->phy_layers[*phyid].dev_info.id = *phyid;
438         cnfg->phy_layers[*phyid].dev_info.dev = dev;
439         cnfg->phy_layers[*phyid].phy_layer = phy_layer;
440         cnfg->phy_layers[*phyid].phy_ref_count = 0;
441         cnfg->phy_layers[*phyid].ifindex = dev->ifindex;
442         cnfg->phy_layers[*phyid].use_stx = stx;
443         cnfg->phy_layers[*phyid].use_fcs = fcs;
444
445         phy_layer->type = phy_type;
446         frml = cffrml_create(*phyid, fcs);
447         if (!frml) {
448                 pr_warn("Out of memory\n");
449                 return;
450         }
451         cnfg->phy_layers[*phyid].frm_layer = frml;
452         cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
453         layer_set_up(frml, cnfg->mux);
454
455         if (phy_driver != NULL) {
456                 phy_driver->id = *phyid;
457                 layer_set_dn(frml, phy_driver);
458                 layer_set_up(phy_driver, frml);
459                 layer_set_dn(phy_driver, phy_layer);
460                 layer_set_up(phy_layer, phy_driver);
461         } else {
462                 layer_set_dn(frml, phy_layer);
463                 layer_set_up(phy_layer, frml);
464         }
465 }
466 EXPORT_SYMBOL(cfcnfg_add_phy_layer);
467
468 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
469 {
470         struct cflayer *frml, *frml_dn;
471         u16 phyid;
472         phyid = phy_layer->id;
473         caif_assert(phyid == cnfg->phy_layers[phyid].id);
474         caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
475         caif_assert(phy_layer->id == phyid);
476         caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
477
478         memset(&cnfg->phy_layers[phy_layer->id], 0,
479                sizeof(struct cfcnfg_phyinfo));
480         frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
481         frml_dn = frml->dn;
482         cffrml_set_uplayer(frml, NULL);
483         cffrml_set_dnlayer(frml, NULL);
484         kfree(frml);
485
486         if (phy_layer != frml_dn) {
487                 layer_set_up(frml_dn, NULL);
488                 layer_set_dn(frml_dn, NULL);
489                 kfree(frml_dn);
490         }
491         layer_set_up(phy_layer, NULL);
492         return 0;
493 }
494 EXPORT_SYMBOL(cfcnfg_del_phy_layer);