xref: /freebsd/lib/libifconfig/libifconfig_sfp.c (revision 61e21613) 
1 /*-
2  * Copyright (c) 2014, Alexander V. Chernikov
3  * Copyright (c) 2020, Ryan Moeller <freqlabs@FreeBSD.org>
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/types.h>
28 #include <sys/param.h>
29 #include <sys/ioctl.h>
30 #include <sys/socket.h>
31 
32 #include <net/if.h>
33 #include <net/sff8436.h>
34 #include <net/sff8472.h>
35 
36 #include <math.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <stdbool.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 
46 #include <libifconfig.h>
47 #include <libifconfig_internal.h>
48 #include <libifconfig_sfp.h>
49 #include <libifconfig_sfp_tables_internal.h>
50 
51 #define     SFF_8636_EXT_COMPLIANCE 0x80
52 
53 struct i2c_info {
54 	struct ifreq ifr;
55 	ifconfig_handle_t *h;
56 	int error;		/* Store first error */
57 	enum sfp_id id;		/* Module type */
58 };
59 
60 static uint8_t
61 find_zero_bit(const struct sfp_enum_metadata *table, int value, int sz)
62 {
63 	int v, m;
64 
65 	for (v = 1, m = 1 << (8 * sz); v < m; v <<= 1) {
66 		if ((value & v) == 0)
67 			continue;
68 		if (find_metadata(table, value & v) != NULL) {
69 			return (value & v);
70 		}
71 	}
72 	return (0);
73 }
74 
75 /*
76  * Reads i2c data from opened kernel socket.
77  */
78 static int
79 read_i2c(struct i2c_info *ii, uint8_t addr, uint8_t off, uint8_t len,
80     uint8_t *buf)
81 {
82 	struct ifi2creq req;
83 	int i, l;
84 
85 	if (ii->error != 0)
86 		return (ii->error);
87 
88 	ii->ifr.ifr_data = (caddr_t)&req;
89 
90 	i = 0;
91 	l = 0;
92 	memset(&req, 0, sizeof(req));
93 	req.dev_addr = addr;
94 	req.offset = off;
95 	req.len = len;
96 
97 	while (len > 0) {
98 		l = MIN(sizeof(req.data), len);
99 		req.len = l;
100 		if (ifconfig_ioctlwrap(ii->h, AF_LOCAL, SIOCGI2C,
101 		    &ii->ifr) != 0) {
102 			ii->error = errno;
103 			return (errno);
104 		}
105 
106 		memcpy(&buf[i], req.data, l);
107 		len -= l;
108 		i += l;
109 		req.offset += l;
110 	}
111 
112 	return (0);
113 }
114 
115 static int
116 i2c_info_init(struct i2c_info *ii, ifconfig_handle_t *h, const char *name)
117 {
118 	uint8_t id_byte;
119 
120 	memset(ii, 0, sizeof(*ii));
121 	strlcpy(ii->ifr.ifr_name, name, sizeof(ii->ifr.ifr_name));
122 	ii->h = h;
123 
124 	/*
125 	 * Try to read byte 0 from i2c:
126 	 * Both SFF-8472 and SFF-8436 use it as
127 	 * 'identification byte'.
128 	 * Stop reading status on zero as value -
129 	 * this might happen in case of empty transceiver slot.
130 	 */
131 	id_byte = 0;
132 	read_i2c(ii, SFF_8472_BASE, SFF_8472_ID, 1, &id_byte);
133 	if (ii->error != 0)
134 		return (-1);
135 	if (id_byte == 0) {
136 		h->error.errtype = OTHER;
137 		h->error.errcode = ENOENT;
138 		return (-1);
139 	}
140 	ii->id = id_byte;
141 	return (0);
142 }
143 
144 static int
145 get_sfp_info(struct i2c_info *ii, struct ifconfig_sfp_info *sfp)
146 {
147 	uint8_t code;
148 
149 	read_i2c(ii, SFF_8472_BASE, SFF_8472_ID, 1, &sfp->sfp_id);
150 	read_i2c(ii, SFF_8472_BASE, SFF_8472_CONNECTOR, 1, &sfp->sfp_conn);
151 
152 	/* Use extended compliance code if it's valid */
153 	read_i2c(ii, SFF_8472_BASE, SFF_8472_TRANS, 1, &sfp->sfp_eth_ext);
154 	if (sfp->sfp_eth_ext == 0) {
155 		/* Next, check 10G Ethernet/IB CCs */
156 		read_i2c(ii, SFF_8472_BASE, SFF_8472_TRANS_START, 1, &code);
157 		sfp->sfp_eth_10g = find_zero_bit(sfp_eth_10g_table, code, 1);
158 		if (sfp->sfp_eth_10g == 0) {
159 			/* No match. Try Ethernet 1G */
160 			read_i2c(ii, SFF_8472_BASE, SFF_8472_TRANS_START + 3,
161 			    1, &code);
162 			sfp->sfp_eth = find_zero_bit(sfp_eth_table, code, 1);
163 		}
164 	}
165 
166 	return (ii->error);
167 }
168 
169 static int
170 get_qsfp_info(struct i2c_info *ii, struct ifconfig_sfp_info *sfp)
171 {
172 	uint8_t code;
173 
174 	read_i2c(ii, SFF_8436_BASE, SFF_8436_ID, 1, &sfp->sfp_id);
175 	read_i2c(ii, SFF_8436_BASE, SFF_8436_CONNECTOR, 1, &sfp->sfp_conn);
176 
177 	read_i2c(ii, SFF_8436_BASE, SFF_8436_STATUS, 1, &sfp->sfp_rev);
178 
179 	/* Check for extended specification compliance */
180 	read_i2c(ii, SFF_8436_BASE, SFF_8436_CODE_E1040100G, 1, &code);
181 	if (code & SFF_8636_EXT_COMPLIANCE) {
182 		read_i2c(ii, SFF_8436_BASE, SFF_8436_OPTIONS_START, 1,
183 		    &sfp->sfp_eth_ext);
184 	} else {
185 		/* Check 10/40G Ethernet class only */
186 		sfp->sfp_eth_1040g =
187 		    find_zero_bit(sfp_eth_1040g_table, code, 1);
188 	}
189 
190 	return (ii->error);
191 }
192 
193 int
194 ifconfig_sfp_get_sfp_info(ifconfig_handle_t *h,
195     const char *name, struct ifconfig_sfp_info *sfp)
196 {
197 	struct i2c_info ii;
198 	char buf[8];
199 
200 	memset(sfp, 0, sizeof(*sfp));
201 
202 	if (i2c_info_init(&ii, h, name) != 0)
203 		return (-1);
204 
205 	/* Read bytes 3-10 at once */
206 	read_i2c(&ii, SFF_8472_BASE, SFF_8472_TRANS_START, 8, buf);
207 	if (ii.error != 0)
208 		return (ii.error);
209 
210 	/* Check 10G ethernet first */
211 	sfp->sfp_eth_10g = find_zero_bit(sfp_eth_10g_table, buf[0], 1);
212 	if (sfp->sfp_eth_10g == 0) {
213 		/* No match. Try 1G */
214 		sfp->sfp_eth = find_zero_bit(sfp_eth_table, buf[3], 1);
215 	}
216 	sfp->sfp_fc_len = find_zero_bit(sfp_fc_len_table, buf[4], 1);
217 	sfp->sfp_fc_media = find_zero_bit(sfp_fc_media_table, buf[6], 1);
218 	sfp->sfp_fc_speed = find_zero_bit(sfp_fc_speed_table, buf[7], 1);
219 	sfp->sfp_cab_tech =
220 	    find_zero_bit(sfp_cab_tech_table, (buf[4] << 8) | buf[5], 2);
221 
222 	if (ifconfig_sfp_id_is_qsfp(ii.id))
223 		return (get_qsfp_info(&ii, sfp));
224 	return (get_sfp_info(&ii, sfp));
225 }
226 
227 static size_t
228 channel_count(enum sfp_id id)
229 {
230 	/* TODO: other ids */
231 	switch (id) {
232 	case SFP_ID_UNKNOWN:
233 		return (0);
234 	case SFP_ID_QSFP:
235 	case SFP_ID_QSFPPLUS:
236 	case SFP_ID_QSFP28:
237 		return (4);
238 	default:
239 		return (1);
240 	}
241 }
242 
243 size_t
244 ifconfig_sfp_channel_count(const struct ifconfig_sfp_info *sfp)
245 {
246 	return (channel_count(sfp->sfp_id));
247 }
248 
249 /*
250  * Print SFF-8472/SFF-8436 string to supplied buffer.
251  * All (vendor-specific) strings are padded right with '0x20'.
252  */
253 static void
254 get_sff_string(struct i2c_info *ii, uint8_t addr, uint8_t off, char *dst)
255 {
256 	read_i2c(ii, addr, off, SFF_VENDOR_STRING_SIZE, dst);
257 	dst += SFF_VENDOR_STRING_SIZE;
258 	do { *dst-- = '\0'; } while (*dst == 0x20);
259 }
260 
261 static void
262 get_sff_date(struct i2c_info *ii, uint8_t addr, uint8_t off, char *dst)
263 {
264 	char buf[SFF_VENDOR_DATE_SIZE];
265 
266 	read_i2c(ii, addr, off, SFF_VENDOR_DATE_SIZE, buf);
267 	sprintf(dst, "20%c%c-%c%c-%c%c", buf[0], buf[1], buf[2], buf[3],
268 	    buf[4], buf[5]);
269 }
270 
271 static int
272 get_sfp_vendor_info(struct i2c_info *ii, struct ifconfig_sfp_vendor_info *vi)
273 {
274 	get_sff_string(ii, SFF_8472_BASE, SFF_8472_VENDOR_START, vi->name);
275 	get_sff_string(ii, SFF_8472_BASE, SFF_8472_PN_START, vi->pn);
276 	get_sff_string(ii, SFF_8472_BASE, SFF_8472_SN_START, vi->sn);
277 	get_sff_date(ii, SFF_8472_BASE, SFF_8472_DATE_START, vi->date);
278 	return (ii->error);
279 }
280 
281 static int
282 get_qsfp_vendor_info(struct i2c_info *ii, struct ifconfig_sfp_vendor_info *vi)
283 {
284 	get_sff_string(ii, SFF_8436_BASE, SFF_8436_VENDOR_START, vi->name);
285 	get_sff_string(ii, SFF_8436_BASE, SFF_8436_PN_START, vi->pn);
286 	get_sff_string(ii, SFF_8436_BASE, SFF_8436_SN_START, vi->sn);
287 	get_sff_date(ii, SFF_8436_BASE, SFF_8436_DATE_START, vi->date);
288 	return (ii->error);
289 }
290 
291 int
292 ifconfig_sfp_get_sfp_vendor_info(ifconfig_handle_t *h,
293     const char *name, struct ifconfig_sfp_vendor_info *vi)
294 {
295 	struct i2c_info ii;
296 
297 	memset(vi, 0, sizeof(*vi));
298 
299 	if (i2c_info_init(&ii, h, name) != 0)
300 		return (-1);
301 
302 	if (ifconfig_sfp_id_is_qsfp(ii.id))
303 		return (get_qsfp_vendor_info(&ii, vi));
304 	return (get_sfp_vendor_info(&ii, vi));
305 }
306 
307 /*
308  * Converts internal temperature (SFF-8472, SFF-8436)
309  * 16-bit unsigned value to human-readable representation:
310  *
311  * Internally measured Module temperature are represented
312  * as a 16-bit signed twos complement value in increments of
313  * 1/256 degrees Celsius, yielding a total range of –128C to +128C
314  * that is considered valid between –40 and +125C.
315  */
316 static double
317 get_sff_temp(struct i2c_info *ii, uint8_t addr, uint8_t off)
318 {
319 	double d;
320 	uint8_t buf[2];
321 
322 	read_i2c(ii, addr, off, 2, buf);
323 	d = (double)buf[0];
324 	d += (double)buf[1] / 256;
325 	return (d);
326 }
327 
328 /*
329  * Retrieves supplied voltage (SFF-8472, SFF-8436).
330  * 16-bit usigned value, treated as range 0..+6.55 Volts
331  */
332 static double
333 get_sff_voltage(struct i2c_info *ii, uint8_t addr, uint8_t off)
334 {
335 	double d;
336 	uint8_t buf[2];
337 
338 	read_i2c(ii, addr, off, 2, buf);
339 	d = (double)((buf[0] << 8) | buf[1]);
340 	return (d / 10000);
341 }
342 
343 /*
344  * The following conversions assume internally-calibrated data.
345  * This is always true for SFF-8346, and explicitly checked for SFF-8472.
346  */
347 
348 double
349 power_mW(uint16_t power)
350 {
351 	/* Power is specified in units of 0.1 uW. */
352 	return (1.0 * power / 10000);
353 }
354 
355 double
356 power_dBm(uint16_t power)
357 {
358 	return (10.0 * log10(power_mW(power)));
359 }
360 
361 double
362 bias_mA(uint16_t bias)
363 {
364 	/* Bias current is specified in units of 2 uA. */
365 	return (1.0 * bias / 500);
366 }
367 
368 static uint16_t
369 get_sff_channel(struct i2c_info *ii, uint8_t addr, uint8_t off)
370 {
371 	uint8_t buf[2];
372 
373 	read_i2c(ii, addr, off, 2, buf);
374 	if (ii->error != 0)
375 		return (0);
376 
377 	return ((buf[0] << 8) + buf[1]);
378 }
379 
380 static int
381 get_sfp_status(struct i2c_info *ii, struct ifconfig_sfp_status *ss)
382 {
383 	uint8_t diag_type, flags;
384 
385 	/* Read diagnostic monitoring type */
386 	read_i2c(ii, SFF_8472_BASE, SFF_8472_DIAG_TYPE, 1, (caddr_t)&diag_type);
387 	if (ii->error != 0)
388 		return (-1);
389 
390 	/*
391 	 * Read monitoring data IFF it is supplied AND is
392 	 * internally calibrated
393 	 */
394 	flags = SFF_8472_DDM_DONE | SFF_8472_DDM_INTERNAL;
395 	if ((diag_type & flags) != flags) {
396 		ii->h->error.errtype = OTHER;
397 		ii->h->error.errcode = ENXIO;
398 		return (-1);
399 	}
400 
401 	ss->temp = get_sff_temp(ii, SFF_8472_DIAG, SFF_8472_TEMP);
402 	ss->voltage = get_sff_voltage(ii, SFF_8472_DIAG, SFF_8472_VCC);
403 	ss->channel = calloc(channel_count(ii->id), sizeof(*ss->channel));
404 	if (ss->channel == NULL) {
405 		ii->h->error.errtype = OTHER;
406 		ii->h->error.errcode = ENOMEM;
407 		return (-1);
408 	}
409 	ss->channel[0].rx = get_sff_channel(ii, SFF_8472_DIAG, SFF_8472_RX_POWER);
410 	ss->channel[0].tx = get_sff_channel(ii, SFF_8472_DIAG, SFF_8472_TX_BIAS);
411 	return (ii->error);
412 }
413 
414 static uint32_t
415 get_qsfp_bitrate(struct i2c_info *ii)
416 {
417 	uint8_t code;
418 	uint32_t rate;
419 
420 	code = 0;
421 	read_i2c(ii, SFF_8436_BASE, SFF_8436_BITRATE, 1, &code);
422 	rate = code * 100;
423 	if (code == 0xFF) {
424 		read_i2c(ii, SFF_8436_BASE, SFF_8636_BITRATE, 1, &code);
425 		rate = code * 250;
426 	}
427 
428 	return (rate);
429 }
430 
431 static int
432 get_qsfp_status(struct i2c_info *ii, struct ifconfig_sfp_status *ss)
433 {
434 	size_t channels;
435 
436 	ss->temp = get_sff_temp(ii, SFF_8436_BASE, SFF_8436_TEMP);
437 	ss->voltage = get_sff_voltage(ii, SFF_8436_BASE, SFF_8436_VCC);
438 	channels = channel_count(ii->id);
439 	ss->channel = calloc(channels, sizeof(*ss->channel));
440 	if (ss->channel == NULL) {
441 		ii->h->error.errtype = OTHER;
442 		ii->h->error.errcode = ENOMEM;
443 		return (-1);
444 	}
445 	for (size_t chan = 0; chan < channels; ++chan) {
446 		uint8_t rxoffs = SFF_8436_RX_CH1_MSB + chan * sizeof(uint16_t);
447 		uint8_t txoffs = SFF_8436_TX_CH1_MSB + chan * sizeof(uint16_t);
448 		ss->channel[chan].rx =
449 		    get_sff_channel(ii, SFF_8436_BASE, rxoffs);
450 		ss->channel[chan].tx =
451 		    get_sff_channel(ii, SFF_8436_BASE, txoffs);
452 	}
453 	ss->bitrate = get_qsfp_bitrate(ii);
454 	return (ii->error);
455 }
456 
457 int
458 ifconfig_sfp_get_sfp_status(ifconfig_handle_t *h, const char *name,
459     struct ifconfig_sfp_status *ss)
460 {
461 	struct i2c_info ii;
462 
463 	memset(ss, 0, sizeof(*ss));
464 
465 	if (i2c_info_init(&ii, h, name) != 0)
466 		return (-1);
467 
468 	if (ifconfig_sfp_id_is_qsfp(ii.id))
469 		return (get_qsfp_status(&ii, ss));
470 	return (get_sfp_status(&ii, ss));
471 }
472 
473 void
474 ifconfig_sfp_free_sfp_status(struct ifconfig_sfp_status *ss)
475 {
476 	if (ss != NULL)
477 		free(ss->channel);
478 }
479 
480 static const char *
481 sfp_id_string_alt(uint8_t value)
482 {
483 	const char *id;
484 
485 	if (value <= SFF_8024_ID_LAST)
486 		id = sff_8024_id[value];
487 	else if (value > 0x80)
488 		id = "Vendor specific";
489 	else
490 		id = "Reserved";
491 
492 	return (id);
493 }
494 
495 static const char *
496 sfp_conn_string_alt(uint8_t value)
497 {
498 	const char *conn;
499 
500 	if (value >= 0x0D && value <= 0x1F)
501 		conn = "Unallocated";
502 	else if (value >= 0x24 && value <= 0x7F)
503 		conn = "Unallocated";
504 	else
505 		conn = "Vendor specific";
506 
507 	return (conn);
508 }
509 
510 void
511 ifconfig_sfp_get_sfp_info_strings(const struct ifconfig_sfp_info *sfp,
512     struct ifconfig_sfp_info_strings *strings)
513 {
514 	get_sfp_info_strings(sfp, strings);
515 	if (strings->sfp_id == NULL)
516 		strings->sfp_id = sfp_id_string_alt(sfp->sfp_id);
517 	if (strings->sfp_conn == NULL)
518 		strings->sfp_conn = sfp_conn_string_alt(sfp->sfp_conn);
519 	if (strings->sfp_rev == NULL)
520 		strings->sfp_rev = "Unallocated";
521 }
522 
523 const char *
524 ifconfig_sfp_physical_spec(const struct ifconfig_sfp_info *sfp,
525     const struct ifconfig_sfp_info_strings *strings)
526 {
527 	switch (sfp->sfp_id) {
528 	case SFP_ID_UNKNOWN:
529 		break;
530 	case SFP_ID_QSFP:
531 	case SFP_ID_QSFPPLUS:
532 	case SFP_ID_QSFP28:
533 		if (sfp->sfp_eth_1040g & SFP_ETH_1040G_EXTENDED)
534 			return (strings->sfp_eth_ext);
535 		else if (sfp->sfp_eth_1040g)
536 			return (strings->sfp_eth_1040g);
537 		break;
538 	default:
539 		if (sfp->sfp_eth_ext)
540 			return (strings->sfp_eth_ext);
541 		else if (sfp->sfp_eth_10g)
542 			return (strings->sfp_eth_10g);
543 		else if (sfp->sfp_eth)
544 			return (strings->sfp_eth);
545 		break;
546 	}
547 	return ("Unknown");
548 }
549 
550 int
551 ifconfig_sfp_get_sfp_dump(ifconfig_handle_t *h, const char *name,
552     struct ifconfig_sfp_dump *dump)
553 {
554 	struct i2c_info ii;
555 	uint8_t *buf = dump->data;
556 
557 	memset(dump->data, 0, sizeof(dump->data));
558 
559 	if (i2c_info_init(&ii, h, name) != 0)
560 		return (-1);
561 
562 	if (ifconfig_sfp_id_is_qsfp(ii.id)) {
563 		read_i2c(&ii, SFF_8436_BASE, QSFP_DUMP0_START, QSFP_DUMP0_SIZE,
564 		    buf + QSFP_DUMP0_START);
565 		read_i2c(&ii, SFF_8436_BASE, QSFP_DUMP1_START, QSFP_DUMP1_SIZE,
566 		    buf + QSFP_DUMP1_START);
567 	} else {
568 		read_i2c(&ii, SFF_8472_BASE, SFP_DUMP_START, SFP_DUMP_SIZE,
569 		    buf + SFP_DUMP_START);
570 	}
571 
572 	return (ii.error != 0 ? -1 : 0);
573 }
574 
575 size_t
576 ifconfig_sfp_dump_region_count(const struct ifconfig_sfp_dump *dp)
577 {
578 	uint8_t id_byte = dp->data[0];
579 
580 	switch ((enum sfp_id)id_byte) {
581 	case SFP_ID_UNKNOWN:
582 		return (0);
583 	case SFP_ID_QSFP:
584 	case SFP_ID_QSFPPLUS:
585 	case SFP_ID_QSFP28:
586 		return (2);
587 	default:
588 		return (1);
589 	}
590 }
591