1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/ethtool.h>
4 #include <linux/jiffies.h>
5
6 #include "common.h"
7 #include "module_fw.h"
8 #include "cmis.h"
9
10 /* For accessing the LPL field on page 9Fh, the allowable length extension is
11 * min(i, 15) byte octets where i specifies the allowable additional number of
12 * byte octets in a READ or a WRITE.
13 */
ethtool_cmis_get_max_lpl_size(u8 num_of_byte_octs)14 u32 ethtool_cmis_get_max_lpl_size(u8 num_of_byte_octs)
15 {
16 return 8 * (1 + min_t(u8, num_of_byte_octs, 15));
17 }
18
19 /* For accessing the EPL field on page 9Fh, the allowable length extension is
20 * min(i, 255) byte octets where i specifies the allowable additional number of
21 * byte octets in a READ or a WRITE.
22 */
ethtool_cmis_get_max_epl_size(u8 num_of_byte_octs)23 u32 ethtool_cmis_get_max_epl_size(u8 num_of_byte_octs)
24 {
25 return 8 * (1 + min_t(u8, num_of_byte_octs, 255));
26 }
27
ethtool_cmis_cdb_compose_args(struct ethtool_cmis_cdb_cmd_args * args,enum ethtool_cmis_cdb_cmd_id cmd,u8 * lpl,u8 lpl_len,u8 * epl,u16 epl_len,u16 max_duration,u8 read_write_len_ext,u16 msleep_pre_rpl,u8 rpl_exp_len,u8 flags)28 void ethtool_cmis_cdb_compose_args(struct ethtool_cmis_cdb_cmd_args *args,
29 enum ethtool_cmis_cdb_cmd_id cmd, u8 *lpl,
30 u8 lpl_len, u8 *epl, u16 epl_len,
31 u16 max_duration, u8 read_write_len_ext,
32 u16 msleep_pre_rpl, u8 rpl_exp_len, u8 flags)
33 {
34 args->req.id = cpu_to_be16(cmd);
35 args->req.lpl_len = lpl_len;
36 if (lpl) {
37 memcpy(args->req.payload, lpl, args->req.lpl_len);
38 args->read_write_len_ext =
39 ethtool_cmis_get_max_lpl_size(read_write_len_ext);
40 }
41 if (epl) {
42 args->req.epl_len = cpu_to_be16(epl_len);
43 args->req.epl = epl;
44 args->read_write_len_ext =
45 ethtool_cmis_get_max_epl_size(read_write_len_ext);
46 }
47
48 args->max_duration = max_duration;
49 args->msleep_pre_rpl = msleep_pre_rpl;
50 args->rpl_exp_len = rpl_exp_len;
51 args->flags = flags;
52 args->err_msg = NULL;
53 }
54
ethtool_cmis_page_init(struct ethtool_module_eeprom * page_data,u8 page,u32 offset,u32 length)55 void ethtool_cmis_page_init(struct ethtool_module_eeprom *page_data,
56 u8 page, u32 offset, u32 length)
57 {
58 page_data->page = page;
59 page_data->offset = offset;
60 page_data->length = length;
61 page_data->i2c_address = ETHTOOL_CMIS_CDB_PAGE_I2C_ADDR;
62 }
63
64 #define CMIS_REVISION_PAGE 0x00
65 #define CMIS_REVISION_OFFSET 0x01
66
67 struct cmis_rev_rpl {
68 u8 rev;
69 };
70
cmis_rev_rpl_major(struct cmis_rev_rpl * rpl)71 static u8 cmis_rev_rpl_major(struct cmis_rev_rpl *rpl)
72 {
73 return rpl->rev >> 4;
74 }
75
cmis_rev_major_get(struct net_device * dev,u8 * rev_major)76 static int cmis_rev_major_get(struct net_device *dev, u8 *rev_major)
77 {
78 const struct ethtool_ops *ops = dev->ethtool_ops;
79 struct ethtool_module_eeprom page_data = {0};
80 struct netlink_ext_ack extack = {};
81 struct cmis_rev_rpl rpl = {};
82 int err;
83
84 ethtool_cmis_page_init(&page_data, CMIS_REVISION_PAGE,
85 CMIS_REVISION_OFFSET, sizeof(rpl));
86 page_data.data = (u8 *)&rpl;
87
88 err = ops->get_module_eeprom_by_page(dev, &page_data, &extack);
89 if (err < 0) {
90 if (extack._msg)
91 netdev_err(dev, "%s\n", extack._msg);
92 return err;
93 }
94
95 *rev_major = cmis_rev_rpl_major(&rpl);
96
97 return 0;
98 }
99
100 #define CMIS_CDB_ADVERTISEMENT_PAGE 0x01
101 #define CMIS_CDB_ADVERTISEMENT_OFFSET 0xA3
102
103 /* Based on section 8.4.11 "CDB Messaging Support Advertisement" in CMIS
104 * standard revision 5.2.
105 */
106 struct cmis_cdb_advert_rpl {
107 u8 inst_supported;
108 u8 read_write_len_ext;
109 u8 resv1;
110 u8 resv2;
111 };
112
cmis_cdb_advert_rpl_inst_supported(struct cmis_cdb_advert_rpl * rpl)113 static u8 cmis_cdb_advert_rpl_inst_supported(struct cmis_cdb_advert_rpl *rpl)
114 {
115 return rpl->inst_supported >> 6;
116 }
117
cmis_cdb_advertisement_get(struct ethtool_cmis_cdb * cdb,struct net_device * dev,struct ethnl_module_fw_flash_ntf_params * ntf_params)118 static int cmis_cdb_advertisement_get(struct ethtool_cmis_cdb *cdb,
119 struct net_device *dev,
120 struct ethnl_module_fw_flash_ntf_params *ntf_params)
121 {
122 const struct ethtool_ops *ops = dev->ethtool_ops;
123 struct ethtool_module_eeprom page_data = {};
124 struct cmis_cdb_advert_rpl rpl = {};
125 struct netlink_ext_ack extack = {};
126 int err;
127
128 ethtool_cmis_page_init(&page_data, CMIS_CDB_ADVERTISEMENT_PAGE,
129 CMIS_CDB_ADVERTISEMENT_OFFSET, sizeof(rpl));
130 page_data.data = (u8 *)&rpl;
131
132 err = ops->get_module_eeprom_by_page(dev, &page_data, &extack);
133 if (err < 0) {
134 if (extack._msg)
135 netdev_err(dev, "%s\n", extack._msg);
136 return err;
137 }
138
139 if (!cmis_cdb_advert_rpl_inst_supported(&rpl)) {
140 ethnl_module_fw_flash_ntf_err(dev, ntf_params,
141 "CDB functionality is not supported",
142 NULL);
143 return -EOPNOTSUPP;
144 }
145
146 cdb->read_write_len_ext = rpl.read_write_len_ext;
147
148 return 0;
149 }
150
151 #define CMIS_PASSWORD_ENTRY_PAGE 0x00
152 #define CMIS_PASSWORD_ENTRY_OFFSET 0x7A
153
154 struct cmis_password_entry_pl {
155 __be32 password;
156 };
157
158 /* See section 9.3.1 "CMD 0000h: Query Status" in CMIS standard revision 5.2.
159 * struct cmis_cdb_query_status_pl and struct cmis_cdb_query_status_rpl are
160 * structured layouts of the flat arrays,
161 * struct ethtool_cmis_cdb_request::payload and
162 * struct ethtool_cmis_cdb_rpl::payload respectively.
163 */
164 struct cmis_cdb_query_status_pl {
165 u16 response_delay;
166 };
167
168 struct cmis_cdb_query_status_rpl {
169 u8 length;
170 u8 status;
171 };
172
173 static int
cmis_cdb_validate_password(struct ethtool_cmis_cdb * cdb,struct net_device * dev,const struct ethtool_module_fw_flash_params * params,struct ethnl_module_fw_flash_ntf_params * ntf_params)174 cmis_cdb_validate_password(struct ethtool_cmis_cdb *cdb,
175 struct net_device *dev,
176 const struct ethtool_module_fw_flash_params *params,
177 struct ethnl_module_fw_flash_ntf_params *ntf_params)
178 {
179 const struct ethtool_ops *ops = dev->ethtool_ops;
180 struct cmis_cdb_query_status_pl qs_pl = {0};
181 struct ethtool_module_eeprom page_data = {};
182 struct ethtool_cmis_cdb_cmd_args args = {};
183 struct cmis_password_entry_pl pe_pl = {};
184 struct cmis_cdb_query_status_rpl *rpl;
185 struct netlink_ext_ack extack = {};
186 int err;
187
188 ethtool_cmis_page_init(&page_data, CMIS_PASSWORD_ENTRY_PAGE,
189 CMIS_PASSWORD_ENTRY_OFFSET, sizeof(pe_pl));
190 page_data.data = (u8 *)&pe_pl;
191
192 pe_pl = *((struct cmis_password_entry_pl *)page_data.data);
193 pe_pl.password = params->password;
194 err = ops->set_module_eeprom_by_page(dev, &page_data, &extack);
195 if (err < 0) {
196 if (extack._msg)
197 netdev_err(dev, "%s\n", extack._msg);
198 return err;
199 }
200
201 ethtool_cmis_cdb_compose_args(&args, ETHTOOL_CMIS_CDB_CMD_QUERY_STATUS,
202 (u8 *)&qs_pl, sizeof(qs_pl), NULL, 0, 0,
203 cdb->read_write_len_ext, 1000,
204 sizeof(*rpl),
205 CDB_F_COMPLETION_VALID | CDB_F_STATUS_VALID);
206
207 err = ethtool_cmis_cdb_execute_cmd(dev, &args);
208 if (err < 0) {
209 ethnl_module_fw_flash_ntf_err(dev, ntf_params,
210 "Query Status command failed",
211 args.err_msg);
212 return err;
213 }
214
215 rpl = (struct cmis_cdb_query_status_rpl *)args.req.payload;
216 if (!rpl->length || !rpl->status) {
217 ethnl_module_fw_flash_ntf_err(dev, ntf_params,
218 "Password was not accepted",
219 NULL);
220 return -EINVAL;
221 }
222
223 return 0;
224 }
225
226 /* Some CDB commands asserts the CDB completion flag only from CMIS
227 * revision 5. Therefore, check the relevant validity flag only when
228 * the revision supports it.
229 */
ethtool_cmis_cdb_check_completion_flag(u8 cmis_rev,u8 * flags)230 void ethtool_cmis_cdb_check_completion_flag(u8 cmis_rev, u8 *flags)
231 {
232 *flags |= cmis_rev >= 5 ? CDB_F_COMPLETION_VALID : 0;
233 }
234
235 #define CMIS_CDB_MODULE_FEATURES_RESV_DATA 34
236
237 /* See section 9.4.1 "CMD 0040h: Module Features" in CMIS standard revision 5.2.
238 * struct cmis_cdb_module_features_rpl is structured layout of the flat
239 * array, ethtool_cmis_cdb_rpl::payload.
240 */
241 struct cmis_cdb_module_features_rpl {
242 u8 resv1[CMIS_CDB_MODULE_FEATURES_RESV_DATA];
243 __be16 max_completion_time;
244 };
245
246 static u16
cmis_cdb_module_features_completion_time(struct cmis_cdb_module_features_rpl * rpl)247 cmis_cdb_module_features_completion_time(struct cmis_cdb_module_features_rpl *rpl)
248 {
249 return be16_to_cpu(rpl->max_completion_time);
250 }
251
cmis_cdb_module_features_get(struct ethtool_cmis_cdb * cdb,struct net_device * dev,struct ethnl_module_fw_flash_ntf_params * ntf_params)252 static int cmis_cdb_module_features_get(struct ethtool_cmis_cdb *cdb,
253 struct net_device *dev,
254 struct ethnl_module_fw_flash_ntf_params *ntf_params)
255 {
256 struct ethtool_cmis_cdb_cmd_args args = {};
257 struct cmis_cdb_module_features_rpl *rpl;
258 u8 flags = CDB_F_STATUS_VALID;
259 int err;
260
261 ethtool_cmis_cdb_check_completion_flag(cdb->cmis_rev, &flags);
262 ethtool_cmis_cdb_compose_args(&args,
263 ETHTOOL_CMIS_CDB_CMD_MODULE_FEATURES,
264 NULL, 0, NULL, 0, 0,
265 cdb->read_write_len_ext, 1000,
266 sizeof(*rpl), flags);
267
268 err = ethtool_cmis_cdb_execute_cmd(dev, &args);
269 if (err < 0) {
270 ethnl_module_fw_flash_ntf_err(dev, ntf_params,
271 "Module Features command failed",
272 args.err_msg);
273 return err;
274 }
275
276 rpl = (struct cmis_cdb_module_features_rpl *)args.req.payload;
277 cdb->max_completion_time =
278 cmis_cdb_module_features_completion_time(rpl);
279
280 return 0;
281 }
282
283 struct ethtool_cmis_cdb *
ethtool_cmis_cdb_init(struct net_device * dev,const struct ethtool_module_fw_flash_params * params,struct ethnl_module_fw_flash_ntf_params * ntf_params)284 ethtool_cmis_cdb_init(struct net_device *dev,
285 const struct ethtool_module_fw_flash_params *params,
286 struct ethnl_module_fw_flash_ntf_params *ntf_params)
287 {
288 struct ethtool_cmis_cdb *cdb;
289 int err;
290
291 cdb = kzalloc(sizeof(*cdb), GFP_KERNEL);
292 if (!cdb)
293 return ERR_PTR(-ENOMEM);
294
295 err = cmis_rev_major_get(dev, &cdb->cmis_rev);
296 if (err < 0)
297 goto err;
298
299 if (cdb->cmis_rev < 4) {
300 ethnl_module_fw_flash_ntf_err(dev, ntf_params,
301 "CMIS revision doesn't support module firmware flashing",
302 NULL);
303 err = -EOPNOTSUPP;
304 goto err;
305 }
306
307 err = cmis_cdb_advertisement_get(cdb, dev, ntf_params);
308 if (err < 0)
309 goto err;
310
311 if (params->password_valid) {
312 err = cmis_cdb_validate_password(cdb, dev, params, ntf_params);
313 if (err < 0)
314 goto err;
315 }
316
317 err = cmis_cdb_module_features_get(cdb, dev, ntf_params);
318 if (err < 0)
319 goto err;
320
321 return cdb;
322
323 err:
324 ethtool_cmis_cdb_fini(cdb);
325 return ERR_PTR(err);
326 }
327
ethtool_cmis_cdb_fini(struct ethtool_cmis_cdb * cdb)328 void ethtool_cmis_cdb_fini(struct ethtool_cmis_cdb *cdb)
329 {
330 kfree(cdb);
331 }
332
is_completed(u8 data)333 static bool is_completed(u8 data)
334 {
335 return !!(data & 0x40);
336 }
337
338 #define CMIS_CDB_STATUS_SUCCESS 0x01
339
status_success(u8 data)340 static bool status_success(u8 data)
341 {
342 return data == CMIS_CDB_STATUS_SUCCESS;
343 }
344
345 #define CMIS_CDB_STATUS_FAIL 0x40
346
status_fail(u8 data)347 static bool status_fail(u8 data)
348 {
349 return data & CMIS_CDB_STATUS_FAIL;
350 }
351
352 struct cmis_wait_for_cond_rpl {
353 u8 state;
354 };
355
356 static int
ethtool_cmis_module_poll(struct net_device * dev,struct cmis_wait_for_cond_rpl * rpl,u32 offset,bool (* cond_success)(u8),bool (* cond_fail)(u8))357 ethtool_cmis_module_poll(struct net_device *dev,
358 struct cmis_wait_for_cond_rpl *rpl, u32 offset,
359 bool (*cond_success)(u8), bool (*cond_fail)(u8))
360 {
361 const struct ethtool_ops *ops = dev->ethtool_ops;
362 struct ethtool_module_eeprom page_data = {0};
363 struct netlink_ext_ack extack = {};
364 int err;
365
366 ethtool_cmis_page_init(&page_data, 0, offset, sizeof(rpl));
367 page_data.data = (u8 *)rpl;
368
369 err = ops->get_module_eeprom_by_page(dev, &page_data, &extack);
370 if (err < 0) {
371 if (extack._msg)
372 netdev_err_once(dev, "%s\n", extack._msg);
373 return -EBUSY;
374 }
375
376 if ((*cond_success)(rpl->state))
377 return 0;
378
379 if (*cond_fail && (*cond_fail)(rpl->state))
380 return -EIO;
381
382 return -EBUSY;
383 }
384
ethtool_cmis_wait_for_cond(struct net_device * dev,u8 flags,u8 flag,u16 max_duration,u32 offset,bool (* cond_success)(u8),bool (* cond_fail)(u8),u8 * state)385 int ethtool_cmis_wait_for_cond(struct net_device *dev, u8 flags, u8 flag,
386 u16 max_duration, u32 offset,
387 bool (*cond_success)(u8), bool (*cond_fail)(u8),
388 u8 *state)
389 {
390 struct cmis_wait_for_cond_rpl rpl = {};
391 unsigned long end;
392 int err;
393
394 if (!(flags & flag))
395 return 0;
396
397 if (max_duration == 0)
398 max_duration = U16_MAX;
399
400 end = jiffies + msecs_to_jiffies(max_duration);
401 do {
402 err = ethtool_cmis_module_poll(dev, &rpl, offset, cond_success,
403 cond_fail);
404 if (err != -EBUSY)
405 goto out;
406
407 msleep(20);
408 } while (time_before(jiffies, end));
409
410 err = ethtool_cmis_module_poll(dev, &rpl, offset, cond_success,
411 cond_fail);
412 if (err == -EBUSY)
413 err = -ETIMEDOUT;
414
415 out:
416 *state = rpl.state;
417 return err;
418 }
419
420 #define CMIS_CDB_COMPLETION_FLAG_OFFSET 0x08
421
cmis_cdb_wait_for_completion(struct net_device * dev,struct ethtool_cmis_cdb_cmd_args * args)422 static int cmis_cdb_wait_for_completion(struct net_device *dev,
423 struct ethtool_cmis_cdb_cmd_args *args)
424 {
425 u8 flag;
426 int err;
427
428 /* Some vendors demand waiting time before checking completion flag
429 * in some CDB commands.
430 */
431 msleep(args->msleep_pre_rpl);
432
433 err = ethtool_cmis_wait_for_cond(dev, args->flags,
434 CDB_F_COMPLETION_VALID,
435 args->max_duration,
436 CMIS_CDB_COMPLETION_FLAG_OFFSET,
437 is_completed, NULL, &flag);
438 if (err < 0)
439 args->err_msg = "Completion Flag did not set on time";
440
441 return err;
442 }
443
444 #define CMIS_CDB_STATUS_OFFSET 0x25
445
cmis_cdb_status_fail_msg_get(u8 status,char ** err_msg)446 static void cmis_cdb_status_fail_msg_get(u8 status, char **err_msg)
447 {
448 switch (status) {
449 case 0b10000001:
450 *err_msg = "CDB Status is in progress: Busy capturing command";
451 break;
452 case 0b10000010:
453 *err_msg =
454 "CDB Status is in progress: Busy checking/validating command";
455 break;
456 case 0b10000011:
457 *err_msg = "CDB Status is in progress: Busy executing";
458 break;
459 case 0b01000000:
460 *err_msg = "CDB status failed: no specific failure";
461 break;
462 case 0b01000010:
463 *err_msg =
464 "CDB status failed: Parameter range error or parameter not supported";
465 break;
466 case 0b01000101:
467 *err_msg = "CDB status failed: CdbChkCode error";
468 break;
469 case 0b01000110:
470 *err_msg = "CDB status failed: Password error";
471 break;
472 default:
473 *err_msg = "Unknown failure reason";
474 }
475 };
476
cmis_cdb_wait_for_status(struct net_device * dev,struct ethtool_cmis_cdb_cmd_args * args)477 static int cmis_cdb_wait_for_status(struct net_device *dev,
478 struct ethtool_cmis_cdb_cmd_args *args)
479 {
480 u8 status;
481 int err;
482
483 /* Some vendors demand waiting time before checking status in some
484 * CDB commands.
485 */
486 msleep(args->msleep_pre_rpl);
487
488 err = ethtool_cmis_wait_for_cond(dev, args->flags, CDB_F_STATUS_VALID,
489 args->max_duration,
490 CMIS_CDB_STATUS_OFFSET,
491 status_success, status_fail, &status);
492 if (err < 0 && !args->err_msg)
493 cmis_cdb_status_fail_msg_get(status, &args->err_msg);
494
495 return err;
496 }
497
498 #define CMIS_CDB_REPLY_OFFSET 0x86
499
cmis_cdb_process_reply(struct net_device * dev,struct ethtool_module_eeprom * page_data,struct ethtool_cmis_cdb_cmd_args * args)500 static int cmis_cdb_process_reply(struct net_device *dev,
501 struct ethtool_module_eeprom *page_data,
502 struct ethtool_cmis_cdb_cmd_args *args)
503 {
504 u8 rpl_hdr_len = sizeof(struct ethtool_cmis_cdb_rpl_hdr);
505 u8 rpl_exp_len = args->rpl_exp_len + rpl_hdr_len;
506 const struct ethtool_ops *ops = dev->ethtool_ops;
507 struct netlink_ext_ack extack = {};
508 struct ethtool_cmis_cdb_rpl *rpl;
509 int err;
510
511 if (!args->rpl_exp_len)
512 return 0;
513
514 ethtool_cmis_page_init(page_data, ETHTOOL_CMIS_CDB_CMD_PAGE,
515 CMIS_CDB_REPLY_OFFSET, rpl_exp_len);
516 page_data->data = kmalloc(page_data->length, GFP_KERNEL);
517 if (!page_data->data)
518 return -ENOMEM;
519
520 err = ops->get_module_eeprom_by_page(dev, page_data, &extack);
521 if (err < 0) {
522 if (extack._msg)
523 netdev_err(dev, "%s\n", extack._msg);
524 goto out;
525 }
526
527 rpl = (struct ethtool_cmis_cdb_rpl *)page_data->data;
528 if ((args->rpl_exp_len > rpl->hdr.rpl_len + rpl_hdr_len) ||
529 !rpl->hdr.rpl_chk_code) {
530 err = -EIO;
531 goto out;
532 }
533
534 args->req.lpl_len = rpl->hdr.rpl_len;
535 memcpy(args->req.payload, rpl->payload, args->req.lpl_len);
536
537 out:
538 kfree(page_data->data);
539 return err;
540 }
541
542 static int
__ethtool_cmis_cdb_execute_cmd(struct net_device * dev,struct ethtool_module_eeprom * page_data,u8 page,u32 offset,u32 length,void * data)543 __ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
544 struct ethtool_module_eeprom *page_data,
545 u8 page, u32 offset, u32 length, void *data)
546 {
547 const struct ethtool_ops *ops = dev->ethtool_ops;
548 struct netlink_ext_ack extack = {};
549 int err;
550
551 ethtool_cmis_page_init(page_data, page, offset, length);
552 page_data->data = kmemdup(data, page_data->length, GFP_KERNEL);
553 if (!page_data->data)
554 return -ENOMEM;
555
556 err = ops->set_module_eeprom_by_page(dev, page_data, &extack);
557 if (err < 0) {
558 if (extack._msg)
559 netdev_err(dev, "%s\n", extack._msg);
560 }
561
562 kfree(page_data->data);
563 return err;
564 }
565
566 #define CMIS_CDB_EPL_PAGE_START 0xA0
567 #define CMIS_CDB_EPL_PAGE_END 0xAF
568 #define CMIS_CDB_EPL_FW_BLOCK_OFFSET_START 128
569 #define CMIS_CDB_EPL_FW_BLOCK_OFFSET_END 255
570
571 static int
ethtool_cmis_cdb_execute_epl_cmd(struct net_device * dev,struct ethtool_cmis_cdb_cmd_args * args,struct ethtool_module_eeprom * page_data)572 ethtool_cmis_cdb_execute_epl_cmd(struct net_device *dev,
573 struct ethtool_cmis_cdb_cmd_args *args,
574 struct ethtool_module_eeprom *page_data)
575 {
576 u16 epl_len = be16_to_cpu(args->req.epl_len);
577 u32 bytes_written = 0;
578 u8 page;
579 int err;
580
581 for (page = CMIS_CDB_EPL_PAGE_START;
582 page <= CMIS_CDB_EPL_PAGE_END && bytes_written < epl_len; page++) {
583 u16 offset = CMIS_CDB_EPL_FW_BLOCK_OFFSET_START;
584
585 while (offset <= CMIS_CDB_EPL_FW_BLOCK_OFFSET_END &&
586 bytes_written < epl_len) {
587 u32 bytes_left = epl_len - bytes_written;
588 u16 space_left, bytes_to_write;
589
590 space_left = CMIS_CDB_EPL_FW_BLOCK_OFFSET_END - offset + 1;
591 bytes_to_write = min_t(u16, bytes_left,
592 min_t(u16, space_left,
593 args->read_write_len_ext));
594
595 err = __ethtool_cmis_cdb_execute_cmd(dev, page_data,
596 page, offset,
597 bytes_to_write,
598 args->req.epl + bytes_written);
599 if (err < 0)
600 return err;
601
602 offset += bytes_to_write;
603 bytes_written += bytes_to_write;
604 }
605 }
606 return 0;
607 }
608
cmis_cdb_calc_checksum(const void * data,size_t size)609 static u8 cmis_cdb_calc_checksum(const void *data, size_t size)
610 {
611 const u8 *bytes = (const u8 *)data;
612 u8 checksum = 0;
613
614 for (size_t i = 0; i < size; i++)
615 checksum += bytes[i];
616
617 return ~checksum;
618 }
619
620 #define CMIS_CDB_CMD_ID_OFFSET 0x80
621
ethtool_cmis_cdb_execute_cmd(struct net_device * dev,struct ethtool_cmis_cdb_cmd_args * args)622 int ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
623 struct ethtool_cmis_cdb_cmd_args *args)
624 {
625 struct ethtool_module_eeprom page_data = {};
626 u32 offset;
627 int err;
628
629 args->req.chk_code =
630 cmis_cdb_calc_checksum(&args->req,
631 offsetof(struct ethtool_cmis_cdb_request,
632 epl));
633
634 if (args->req.lpl_len > args->read_write_len_ext) {
635 args->err_msg = "LPL length is longer than CDB read write length extension allows";
636 return -EINVAL;
637 }
638
639 /* According to the CMIS standard, there are two options to trigger the
640 * CDB commands. The default option is triggering the command by writing
641 * the CMDID bytes. Therefore, the command will be split to 2 calls:
642 * First, with everything except the CMDID field and then the CMDID
643 * field.
644 */
645 offset = CMIS_CDB_CMD_ID_OFFSET +
646 offsetof(struct ethtool_cmis_cdb_request, body);
647 err = __ethtool_cmis_cdb_execute_cmd(dev, &page_data,
648 ETHTOOL_CMIS_CDB_CMD_PAGE, offset,
649 sizeof(args->req.body),
650 &args->req.body);
651 if (err < 0)
652 return err;
653
654 if (args->req.epl_len) {
655 err = ethtool_cmis_cdb_execute_epl_cmd(dev, args, &page_data);
656 if (err < 0)
657 return err;
658 }
659
660 offset = CMIS_CDB_CMD_ID_OFFSET +
661 offsetof(struct ethtool_cmis_cdb_request, id);
662 err = __ethtool_cmis_cdb_execute_cmd(dev, &page_data,
663 ETHTOOL_CMIS_CDB_CMD_PAGE, offset,
664 sizeof(args->req.id),
665 &args->req.id);
666 if (err < 0)
667 return err;
668
669 err = cmis_cdb_wait_for_completion(dev, args);
670 if (err < 0)
671 return err;
672
673 err = cmis_cdb_wait_for_status(dev, args);
674 if (err < 0)
675 return err;
676
677 return cmis_cdb_process_reply(dev, &page_data, args);
678 }
679