nexmon – Blame information for rev 1

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1 office 1 /*
2 * Copyright (c) 2010 Broadcom Corporation
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16  
17 /*******************************************************************************
18 * Communicates with the dongle by using dcmd codes.
19 * For certain dcmd codes, the dongle interprets string data from the host.
20 ******************************************************************************/
21  
22 #include <linux/types.h>
23 #include <linux/netdevice.h>
24  
25 #include <brcmu_utils.h>
26 #include <brcmu_wifi.h>
27  
28 #include "core.h"
29 #include "bus.h"
30 #include "fwsignal.h"
31 #include "debug.h"
32 #include "tracepoint.h"
33 #include "proto.h"
34 #include "bcdc.h"
35  
36 struct brcmf_proto_bcdc_dcmd {
37 __le32 cmd; /* dongle command value */
38 __le32 len; /* lower 16: output buflen;
39 * upper 16: input buflen (excludes header) */
40 __le32 flags; /* flag defns given below */
41 __le32 status; /* status code returned from the device */
42 };
43  
44 /* BCDC flag definitions */
45 #define BCDC_DCMD_ERROR 0x01 /* 1=cmd failed */
46 #define BCDC_DCMD_SET 0x02 /* 0=get, 1=set cmd */
47 #define BCDC_DCMD_IF_MASK 0xF000 /* I/F index */
48 #define BCDC_DCMD_IF_SHIFT 12
49 #define BCDC_DCMD_ID_MASK 0xFFFF0000 /* id an cmd pairing */
50 #define BCDC_DCMD_ID_SHIFT 16 /* ID Mask shift bits */
51 #define BCDC_DCMD_ID(flags) \
52 (((flags) & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT)
53  
54 /*
55 * BCDC header - Broadcom specific extension of CDC.
56 * Used on data packets to convey priority across USB.
57 */
58 #define BCDC_HEADER_LEN 4
59 #define BCDC_PROTO_VER 2 /* Protocol version */
60 #define BCDC_FLAG_VER_MASK 0xf0 /* Protocol version mask */
61 #define BCDC_FLAG_VER_SHIFT 4 /* Protocol version shift */
62 #define BCDC_FLAG_SUM_GOOD 0x04 /* Good RX checksums */
63 #define BCDC_FLAG_SUM_NEEDED 0x08 /* Dongle needs to do TX checksums */
64 #define BCDC_PRIORITY_MASK 0x7
65 #define BCDC_FLAG2_IF_MASK 0x0f /* packet rx interface in APSTA */
66 #define BCDC_FLAG2_IF_SHIFT 0
67  
68 #define BCDC_GET_IF_IDX(hdr) \
69 ((int)((((hdr)->flags2) & BCDC_FLAG2_IF_MASK) >> BCDC_FLAG2_IF_SHIFT))
70 #define BCDC_SET_IF_IDX(hdr, idx) \
71 ((hdr)->flags2 = (((hdr)->flags2 & ~BCDC_FLAG2_IF_MASK) | \
72 ((idx) << BCDC_FLAG2_IF_SHIFT)))
73  
74 /**
75 * struct brcmf_proto_bcdc_header - BCDC header format
76 *
77 * @flags: flags contain protocol and checksum info.
78 * @priority: 802.1d priority and USB flow control info (bit 4:7).
79 * @flags2: additional flags containing dongle interface index.
80 * @data_offset: start of packet data. header is following by firmware signals.
81 */
82 struct brcmf_proto_bcdc_header {
83 u8 flags;
84 u8 priority;
85 u8 flags2;
86 u8 data_offset;
87 };
88  
89 /*
90 * maximum length of firmware signal data between
91 * the BCDC header and packet data in the tx path.
92 */
93 #define BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES 12
94  
95 #define RETRIES 2 /* # of retries to retrieve matching dcmd response */
96 #define BUS_HEADER_LEN (16+64) /* Must be atleast SDPCM_RESERVE
97 * (amount of header tha might be added)
98 * plus any space that might be needed
99 * for bus alignment padding.
100 */
101 struct brcmf_bcdc {
102 u16 reqid;
103 u8 bus_header[BUS_HEADER_LEN];
104 struct brcmf_proto_bcdc_dcmd msg;
105 unsigned char buf[BRCMF_DCMD_MAXLEN];
106 struct brcmf_fws_info *fws;
107 };
108  
109  
110 struct brcmf_fws_info *drvr_to_fws(struct brcmf_pub *drvr)
111 {
112 struct brcmf_bcdc *bcdc = drvr->proto->pd;
113  
114 return bcdc->fws;
115 }
116  
117 static int
118 brcmf_proto_bcdc_msg(struct brcmf_pub *drvr, int ifidx, uint cmd, void *buf,
119 uint len, bool set)
120 {
121 struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
122 struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
123 u32 flags;
124  
125 brcmf_dbg(BCDC, "Enter\n");
126  
127 memset(msg, 0, sizeof(struct brcmf_proto_bcdc_dcmd));
128  
129 msg->cmd = cpu_to_le32(cmd);
130 msg->len = cpu_to_le32(len);
131 flags = (++bcdc->reqid << BCDC_DCMD_ID_SHIFT);
132 if (set)
133 flags |= BCDC_DCMD_SET;
134 flags = (flags & ~BCDC_DCMD_IF_MASK) |
135 (ifidx << BCDC_DCMD_IF_SHIFT);
136 msg->flags = cpu_to_le32(flags);
137  
138 if (buf)
139 memcpy(bcdc->buf, buf, len);
140  
141 len += sizeof(*msg);
142 if (len > BRCMF_TX_IOCTL_MAX_MSG_SIZE)
143 len = BRCMF_TX_IOCTL_MAX_MSG_SIZE;
144  
145 /* Send request */
146 return brcmf_bus_txctl(drvr->bus_if, (unsigned char *)&bcdc->msg, len);
147 }
148  
149 static int brcmf_proto_bcdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
150 {
151 int ret;
152 struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
153  
154 brcmf_dbg(BCDC, "Enter\n");
155 len += sizeof(struct brcmf_proto_bcdc_dcmd);
156 do {
157 ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&bcdc->msg,
158 len);
159 if (ret < 0)
160 break;
161 } while (BCDC_DCMD_ID(le32_to_cpu(bcdc->msg.flags)) != id);
162  
163 return ret;
164 }
165  
166 static int
167 brcmf_proto_bcdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
168 void *buf, uint len)
169 {
170 struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
171 struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
172 void *info;
173 int ret = 0, retries = 0;
174 u32 id, flags;
175  
176 brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);
177  
178 ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, false);
179 if (ret < 0) {
180 brcmf_err("brcmf_proto_bcdc_msg failed w/status %d\n",
181 ret);
182 goto done;
183 }
184  
185 retry:
186 /* wait for interrupt and get first fragment */
187 ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
188 if (ret < 0)
189 goto done;
190  
191 flags = le32_to_cpu(msg->flags);
192 id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;
193  
194 if ((id < bcdc->reqid) && (++retries < RETRIES))
195 goto retry;
196 if (id != bcdc->reqid) {
197 brcmf_err("%s: unexpected request id %d (expected %d)\n",
198 brcmf_ifname(brcmf_get_ifp(drvr, ifidx)), id,
199 bcdc->reqid);
200 ret = -EINVAL;
201 goto done;
202 }
203  
204 /* Check info buffer */
205 info = (void *)&bcdc->buf[0];
206  
207 /* Copy info buffer */
208 if (buf) {
209 if (ret < (int)len)
210 len = ret;
211 memcpy(buf, info, len);
212 }
213  
214 /* Check the ERROR flag */
215 if (flags & BCDC_DCMD_ERROR)
216 ret = le32_to_cpu(msg->status);
217  
218 done:
219 return ret;
220 }
221  
222 static int
223 brcmf_proto_bcdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
224 void *buf, uint len)
225 {
226 struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
227 struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
228 int ret = 0;
229 u32 flags, id;
230  
231 brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);
232  
233 ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, true);
234 if (ret < 0)
235 goto done;
236  
237 ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
238 if (ret < 0)
239 goto done;
240  
241 flags = le32_to_cpu(msg->flags);
242 id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;
243  
244 if (id != bcdc->reqid) {
245 brcmf_err("%s: unexpected request id %d (expected %d)\n",
246 brcmf_ifname(brcmf_get_ifp(drvr, ifidx)), id,
247 bcdc->reqid);
248 ret = -EINVAL;
249 goto done;
250 }
251  
252 /* Check the ERROR flag */
253 if (flags & BCDC_DCMD_ERROR)
254 ret = le32_to_cpu(msg->status);
255  
256 done:
257 return ret;
258 }
259  
260 static void
261 brcmf_proto_bcdc_hdrpush(struct brcmf_pub *drvr, int ifidx, u8 offset,
262 struct sk_buff *pktbuf)
263 {
264 struct brcmf_proto_bcdc_header *h;
265  
266 brcmf_dbg(BCDC, "Enter\n");
267  
268 /* Push BDC header used to convey priority for buses that don't */
269 skb_push(pktbuf, BCDC_HEADER_LEN);
270  
271 h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);
272  
273 h->flags = (BCDC_PROTO_VER << BCDC_FLAG_VER_SHIFT);
274 if (pktbuf->ip_summed == CHECKSUM_PARTIAL)
275 h->flags |= BCDC_FLAG_SUM_NEEDED;
276  
277 h->priority = 0;
278 h->flags2 = 0;
279 h->data_offset = offset;
280 BCDC_SET_IF_IDX(h, ifidx);
281 trace_brcmf_bcdchdr(pktbuf->data);
282 }
283  
284 static int
285 brcmf_proto_bcdc_hdrpull(struct brcmf_pub *drvr, bool do_fws,
286 struct sk_buff *pktbuf, struct brcmf_if **ifp)
287 {
288 struct brcmf_proto_bcdc_header *h;
289 struct brcmf_if *tmp_if;
290  
291 brcmf_dbg(BCDC, "Enter\n");
292  
293 /* Pop BCDC header used to convey priority for buses that don't */
294 if (pktbuf->len <= BCDC_HEADER_LEN) {
295 brcmf_dbg(INFO, "rx data too short (%d <= %d)\n",
296 pktbuf->len, BCDC_HEADER_LEN);
297 return -EBADE;
298 }
299  
300 trace_brcmf_bcdchdr(pktbuf->data);
301 h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);
302  
303 tmp_if = brcmf_get_ifp(drvr, BCDC_GET_IF_IDX(h));
304 if (!tmp_if) {
305 brcmf_dbg(INFO, "no matching ifp found\n");
306 return -EBADE;
307 }
308 if (((h->flags & BCDC_FLAG_VER_MASK) >> BCDC_FLAG_VER_SHIFT) !=
309 BCDC_PROTO_VER) {
310 brcmf_err("%s: non-BCDC packet received, flags 0x%x\n",
311 brcmf_ifname(tmp_if), h->flags);
312 return -EBADE;
313 }
314  
315 if (h->flags & BCDC_FLAG_SUM_GOOD) {
316 brcmf_dbg(BCDC, "%s: BDC rcv, good checksum, flags 0x%x\n",
317 brcmf_ifname(tmp_if), h->flags);
318 pktbuf->ip_summed = CHECKSUM_UNNECESSARY;
319 }
320  
321 pktbuf->priority = h->priority & BCDC_PRIORITY_MASK;
322  
323 skb_pull(pktbuf, BCDC_HEADER_LEN);
324 if (do_fws)
325 brcmf_fws_hdrpull(tmp_if, h->data_offset << 2, pktbuf);
326 else
327 skb_pull(pktbuf, h->data_offset << 2);
328  
329 if (pktbuf->len == 0)
330 return -ENODATA;
331  
332 if (ifp != NULL)
333 *ifp = tmp_if;
334 return 0;
335 }
336  
337 static int brcmf_proto_bcdc_tx_queue_data(struct brcmf_pub *drvr, int ifidx,
338 struct sk_buff *skb)
339 {
340 struct brcmf_if *ifp = brcmf_get_ifp(drvr, ifidx);
341 struct brcmf_bcdc *bcdc = drvr->proto->pd;
342  
343 if (!brcmf_fws_queue_skbs(bcdc->fws))
344 return brcmf_proto_txdata(drvr, ifidx, 0, skb);
345  
346 return brcmf_fws_process_skb(ifp, skb);
347 }
348  
349 static int
350 brcmf_proto_bcdc_txdata(struct brcmf_pub *drvr, int ifidx, u8 offset,
351 struct sk_buff *pktbuf)
352 {
353 brcmf_proto_bcdc_hdrpush(drvr, ifidx, offset, pktbuf);
354 return brcmf_bus_txdata(drvr->bus_if, pktbuf);
355 }
356  
357 void brcmf_proto_bcdc_txflowblock(struct device *dev, bool state)
358 {
359 struct brcmf_bus *bus_if = dev_get_drvdata(dev);
360 struct brcmf_pub *drvr = bus_if->drvr;
361  
362 brcmf_dbg(TRACE, "Enter\n");
363  
364 brcmf_fws_bus_blocked(drvr, state);
365 }
366  
367 void
368 brcmf_proto_bcdc_txcomplete(struct device *dev, struct sk_buff *txp,
369 bool success)
370 {
371 struct brcmf_bus *bus_if = dev_get_drvdata(dev);
372 struct brcmf_bcdc *bcdc = bus_if->drvr->proto->pd;
373 struct brcmf_if *ifp;
374  
375 /* await txstatus signal for firmware if active */
376 if (brcmf_fws_fc_active(bcdc->fws)) {
377 if (!success)
378 brcmf_fws_bustxfail(bcdc->fws, txp);
379 } else {
380 if (brcmf_proto_bcdc_hdrpull(bus_if->drvr, false, txp, &ifp))
381 brcmu_pkt_buf_free_skb(txp);
382 else
383 brcmf_txfinalize(ifp, txp, success);
384 }
385 }
386  
387 static void
388 brcmf_proto_bcdc_configure_addr_mode(struct brcmf_pub *drvr, int ifidx,
389 enum proto_addr_mode addr_mode)
390 {
391 }
392  
393 static void
394 brcmf_proto_bcdc_delete_peer(struct brcmf_pub *drvr, int ifidx,
395 u8 peer[ETH_ALEN])
396 {
397 }
398  
399 static void
400 brcmf_proto_bcdc_add_tdls_peer(struct brcmf_pub *drvr, int ifidx,
401 u8 peer[ETH_ALEN])
402 {
403 }
404  
405 static void brcmf_proto_bcdc_rxreorder(struct brcmf_if *ifp,
406 struct sk_buff *skb)
407 {
408 brcmf_fws_rxreorder(ifp, skb);
409 }
410  
411 static void
412 brcmf_proto_bcdc_add_if(struct brcmf_if *ifp)
413 {
414 brcmf_fws_add_interface(ifp);
415 }
416  
417 static void
418 brcmf_proto_bcdc_del_if(struct brcmf_if *ifp)
419 {
420 brcmf_fws_del_interface(ifp);
421 }
422  
423 static void
424 brcmf_proto_bcdc_reset_if(struct brcmf_if *ifp)
425 {
426 brcmf_fws_reset_interface(ifp);
427 }
428  
429 static int
430 brcmf_proto_bcdc_init_done(struct brcmf_pub *drvr)
431 {
432 struct brcmf_bcdc *bcdc = drvr->proto->pd;
433 struct brcmf_fws_info *fws;
434  
435 fws = brcmf_fws_attach(drvr);
436 if (IS_ERR(fws))
437 return PTR_ERR(fws);
438  
439 bcdc->fws = fws;
440 return 0;
441 }
442  
443 int brcmf_proto_bcdc_attach(struct brcmf_pub *drvr)
444 {
445 struct brcmf_bcdc *bcdc;
446  
447 bcdc = kzalloc(sizeof(*bcdc), GFP_ATOMIC);
448 if (!bcdc)
449 goto fail;
450  
451 /* ensure that the msg buf directly follows the cdc msg struct */
452 if ((unsigned long)(&bcdc->msg + 1) != (unsigned long)bcdc->buf) {
453 brcmf_err("struct brcmf_proto_bcdc is not correctly defined\n");
454 goto fail;
455 }
456  
457 drvr->proto->hdrpull = brcmf_proto_bcdc_hdrpull;
458 drvr->proto->query_dcmd = brcmf_proto_bcdc_query_dcmd;
459 drvr->proto->set_dcmd = brcmf_proto_bcdc_set_dcmd;
460 drvr->proto->tx_queue_data = brcmf_proto_bcdc_tx_queue_data;
461 drvr->proto->txdata = brcmf_proto_bcdc_txdata;
462 drvr->proto->configure_addr_mode = brcmf_proto_bcdc_configure_addr_mode;
463 drvr->proto->delete_peer = brcmf_proto_bcdc_delete_peer;
464 drvr->proto->add_tdls_peer = brcmf_proto_bcdc_add_tdls_peer;
465 drvr->proto->rxreorder = brcmf_proto_bcdc_rxreorder;
466 drvr->proto->add_if = brcmf_proto_bcdc_add_if;
467 drvr->proto->del_if = brcmf_proto_bcdc_del_if;
468 drvr->proto->reset_if = brcmf_proto_bcdc_reset_if;
469 drvr->proto->init_done = brcmf_proto_bcdc_init_done;
470 drvr->proto->pd = bcdc;
471  
472 drvr->hdrlen += BCDC_HEADER_LEN + BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES;
473 drvr->bus_if->maxctl = BRCMF_DCMD_MAXLEN +
474 sizeof(struct brcmf_proto_bcdc_dcmd);
475 return 0;
476  
477 fail:
478 kfree(bcdc);
479 return -ENOMEM;
480 }
481  
482 void brcmf_proto_bcdc_detach(struct brcmf_pub *drvr)
483 {
484 struct brcmf_bcdc *bcdc = drvr->proto->pd;
485  
486 drvr->proto->pd = NULL;
487 brcmf_fws_detach(bcdc->fws);
488 kfree(bcdc);
489 }