xref: /freebsd/lib/libifconfig/libifconfig_sfp.c (revision b3512b30dbec579da28028e29d8b33ec7242af68) 
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  * $FreeBSD$
27  */
28 
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/ioctl.h>
32 #include <sys/socket.h>
33 
34 #include <net/if.h>
35 #include <net/sff8436.h>
36 #include <net/sff8472.h>
37 
38 #include <math.h>
39 #include <err.h>
40 #include <errno.h>
41 #include <fcntl.h>
42 #include <stdbool.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 
48 #include <libifconfig.h>
49 #include <libifconfig_internal.h>
50 #include <libifconfig_sfp.h>
51 #include <libifconfig_sfp_tables_internal.h>
52 
53 #define     SFF_8636_EXT_COMPLIANCE 0x80
54 
55 struct i2c_info {
56 	struct ifreq ifr;
57 	ifconfig_handle_t *h;
58 	int error;		/* Store first error */
59 	enum sfp_id id;		/* Module type */
60 };
61 
62 static uint8_t
63 find_zero_bit(const struct sfp_enum_metadata *table, int value, int sz)
64 {
65 	int v, m;
66 
67 	for (v = 1, m = 1 << (8 * sz); v < m; v <<= 1) {
68 		if ((value & v) == 0)
69 			continue;
70 		if (find_metadata(table, value & v) != NULL) {
71 			return (value & v);
72 		}
73 	}
74 	return (0);
75 }
76 
77 /*
78  * Reads i2c data from opened kernel socket.
79  */
80 static int
81 read_i2c(struct i2c_info *ii, uint8_t addr, uint8_t off, uint8_t len,
82     uint8_t *buf)
83 {
84 	struct ifi2creq req;
85 	int i, l;
86 
87 	if (ii->error != 0)
88 		return (ii->error);
89 
90 	ii->ifr.ifr_data = (caddr_t)&req;
91 
92 	i = 0;
93 	l = 0;
94 	memset(&req, 0, sizeof(req));
95 	req.dev_addr = addr;
96 	req.offset = off;
97 	req.len = len;
98 
99 	while (len > 0) {
100 		l = MIN(sizeof(req.data), len);
101 		req.len = l;
102 		if (ifconfig_ioctlwrap(ii->h, AF_LOCAL, SIOCGI2C,
103 		    &ii->ifr) != 0) {
104 			ii->error = errno;
105 			return (errno);
106 		}
107 
108 		memcpy(&buf[i], req.data, l);
109 		len -= l;
110 		i += l;
111 		req.offset += l;
112 	}
113 
114 	return (0);
115 }
116 
117 static int
118 i2c_info_init(struct i2c_info *ii, ifconfig_handle_t *h, const char *name)
119 {
120 	uint8_t id_byte;
121 
122 	memset(ii, 0, sizeof(*ii));
123 	strlcpy(ii->ifr.ifr_name, name, sizeof(ii->ifr.ifr_name));
124 	ii->h = h;
125 
126 	/*
127 	 * Try to read byte 0 from i2c:
128 	 * Both SFF-8472 and SFF-8436 use it as
129 	 * 'identification byte'.
130 	 * Stop reading status on zero as value -
131 	 * this might happen in case of empty transceiver slot.
132 	 */
133 	id_byte = 0;
134 	read_i2c(ii, SFF_8472_BASE, SFF_8472_ID, 1, &id_byte);
135 	if (ii->error != 0)
136 		return (-1);
137 	if (id_byte == 0) {
138 		h->error.errtype = OTHER;
139 		h->error.errcode = ENOENT;
140 		return (-1);
141 	}
142 	ii->id = id_byte;
143 	return (0);
144 }
145 
146 static int
147 get_sfp_info(struct i2c_info *ii, struct ifconfig_sfp_info *sfp)
148 {
149 	uint8_t code;
150 
151 	read_i2c(ii, SFF_8472_BASE, SFF_8472_ID, 1, &sfp->sfp_id);
152 	read_i2c(ii, SFF_8472_BASE, SFF_8472_CONNECTOR, 1, &sfp->sfp_conn);
153 
154 	/* Use extended compliance code if it's valid */
155 	read_i2c(ii, SFF_8472_BASE, SFF_8472_TRANS, 1, &sfp->sfp_eth_ext);
156 	if (sfp->sfp_eth_ext == 0) {
157 		/* Next, check 10G Ethernet/IB CCs */
158 		read_i2c(ii, SFF_8472_BASE, SFF_8472_TRANS_START, 1, &code);
159 		sfp->sfp_eth_10g = find_zero_bit(sfp_eth_10g_table, code, 1);
160 		if (sfp->sfp_eth_10g == 0) {
161 			/* No match. Try Ethernet 1G */
162 			read_i2c(ii, SFF_8472_BASE, SFF_8472_TRANS_START + 3,
163 			    1, &code);
164 			sfp->sfp_eth = find_zero_bit(sfp_eth_table, code, 1);
165 		}
166 	}
167 
168 	return (ii->error);
169 }
170 
171 static int
172 get_qsfp_info(struct i2c_info *ii, struct ifconfig_sfp_info *sfp)
173 {
174 	uint8_t code;
175 
176 	read_i2c(ii, SFF_8436_BASE, SFF_8436_ID, 1, &sfp->sfp_id);
177 	read_i2c(ii, SFF_8436_BASE, SFF_8436_CONNECTOR, 1, &sfp->sfp_conn);
178 
179 	read_i2c(ii, SFF_8436_BASE, SFF_8436_STATUS, 1, &sfp->sfp_rev);
180 
181 	/* Check for extended specification compliance */
182 	read_i2c(ii, SFF_8436_BASE, SFF_8436_CODE_E1040100G, 1, &code);
183 	if (code & SFF_8636_EXT_COMPLIANCE) {
184 		read_i2c(ii, SFF_8436_BASE, SFF_8436_OPTIONS_START, 1,
185 		    &sfp->sfp_eth_ext);
186 	} else {
187 		/* Check 10/40G Ethernet class only */
188 		sfp->sfp_eth_1040g =
189 		    find_zero_bit(sfp_eth_1040g_table, code, 1);
190 	}
191 
192 	return (ii->error);
193 }
194 
195 int
196 ifconfig_sfp_get_sfp_info(ifconfig_handle_t *h,
197     const char *name, struct ifconfig_sfp_info *sfp)
198 {
199 	struct i2c_info ii;
200 	char buf[8];
201 
202 	memset(sfp, 0, sizeof(*sfp));
203 
204 	if (i2c_info_init(&ii, h, name) != 0)
205 		return (-1);
206 
207 	/* Read bytes 3-10 at once */
208 	read_i2c(&ii, SFF_8472_BASE, SFF_8472_TRANS_START, 8, buf);
209 	if (ii.error != 0)
210 		return (ii.error);
211 
212 	/* Check 10G ethernet first */
213 	sfp->sfp_eth_10g = find_zero_bit(sfp_eth_10g_table, buf[0], 1);
214 	if (sfp->sfp_eth_10g == 0) {
215 		/* No match. Try 1G */
216 		sfp->sfp_eth = find_zero_bit(sfp_eth_table, buf[3], 1);
217 	}
218 	sfp->sfp_fc_len = find_zero_bit(sfp_fc_len_table, buf[4], 1);
219 	sfp->sfp_fc_media = find_zero_bit(sfp_fc_media_table, buf[6], 1);
220 	sfp->sfp_fc_speed = find_zero_bit(sfp_fc_speed_table, buf[7], 1);
221 	sfp->sfp_cab_tech =
222 	    find_zero_bit(sfp_cab_tech_table, (buf[4] << 8) | buf[5], 2);
223 
224 	if (ifconfig_sfp_id_is_qsfp(ii.id))
225 		return (get_qsfp_info(&ii, sfp));
226 	return (get_sfp_info(&ii, sfp));
227 }
228 
229 static size_t
230 channel_count(enum sfp_id id)
231 {
232 	/* TODO: other ids */
233 	switch (id) {
234 	case SFP_ID_UNKNOWN:
235 		return (0);
236 	case SFP_ID_QSFP:
237 	case SFP_ID_QSFPPLUS:
238 	case SFP_ID_QSFP28:
239 		return (4);
240 	default:
241 		return (1);
242 	}
243 }
244 
245 size_t
246 ifconfig_sfp_channel_count(const struct ifconfig_sfp_info *sfp)
247 {
248 	return (channel_count(sfp->sfp_id));
249 }
250 
251 /*
252  * Print SFF-8472/SFF-8436 string to supplied buffer.
253  * All (vendor-specific) strings are padded right with '0x20'.
254  */
255 static void
256 get_sff_string(struct i2c_info *ii, uint8_t addr, uint8_t off, char *dst)
257 {
258 	read_i2c(ii, addr, off, SFF_VENDOR_STRING_SIZE, dst);
259 	dst += SFF_VENDOR_STRING_SIZE;
260 	do { *dst-- = '\0'; } while (*dst == 0x20);
261 }
262 
263 static void
264 get_sff_date(struct i2c_info *ii, uint8_t addr, uint8_t off, char *dst)
265 {
266 	char buf[SFF_VENDOR_DATE_SIZE];
267 
268 	read_i2c(ii, addr, off, SFF_VENDOR_DATE_SIZE, buf);
269 	sprintf(dst, "20%c%c-%c%c-%c%c", buf[0], buf[1], buf[2], buf[3],
270 	    buf[4], buf[5]);
271 }
272 
273 static int
274 get_sfp_vendor_info(struct i2c_info *ii, struct ifconfig_sfp_vendor_info *vi)
275 {
276 	get_sff_string(ii, SFF_8472_BASE, SFF_8472_VENDOR_START, vi->name);
277 	get_sff_string(ii, SFF_8472_BASE, SFF_8472_PN_START, vi->pn);
278 	get_sff_string(ii, SFF_8472_BASE, SFF_8472_SN_START, vi->sn);
279 	get_sff_date(ii, SFF_8472_BASE, SFF_8472_DATE_START, vi->date);
280 	return (ii->error);
281 }
282 
283 static int
284 get_qsfp_vendor_info(struct i2c_info *ii, struct ifconfig_sfp_vendor_info *vi)
285 {
286 	get_sff_string(ii, SFF_8436_BASE, SFF_8436_VENDOR_START, vi->name);
287 	get_sff_string(ii, SFF_8436_BASE, SFF_8436_PN_START, vi->pn);
288 	get_sff_string(ii, SFF_8436_BASE, SFF_8436_SN_START, vi->sn);
289 	get_sff_date(ii, SFF_8436_BASE, SFF_8436_DATE_START, vi->date);
290 	return (ii->error);
291 }
292 
293 int
294 ifconfig_sfp_get_sfp_vendor_info(ifconfig_handle_t *h,
295     const char *name, struct ifconfig_sfp_vendor_info *vi)
296 {
297 	struct i2c_info ii;
298 
299 	memset(vi, 0, sizeof(*vi));
300 
301 	if (i2c_info_init(&ii, h, name) != 0)
302 		return (-1);
303 
304 	if (ifconfig_sfp_id_is_qsfp(ii.id))
305 		return (get_qsfp_vendor_info(&ii, vi));
306 	return (get_sfp_vendor_info(&ii, vi));
307 }
308 
309 /*
310  * Converts internal temperature (SFF-8472, SFF-8436)
311  * 16-bit unsigned value to human-readable representation:
312  *
313  * Internally measured Module temperature are represented
314  * as a 16-bit signed twos complement value in increments of
315  * 1/256 degrees Celsius, yielding a total range of –128C to +128C
316  * that is considered valid between –40 and +125C.
317  */
318 static double
319 get_sff_temp(struct i2c_info *ii, uint8_t addr, uint8_t off)
320 {
321 	double d;
322 	uint8_t buf[2];
323 
324 	read_i2c(ii, addr, off, 2, buf);
325 	d = (double)buf[0];
326 	d += (double)buf[1] / 256;
327 	return (d);
328 }
329 
330 /*
331  * Retrieves supplied voltage (SFF-8472, SFF-8436).
332  * 16-bit usigned value, treated as range 0..+6.55 Volts
333  */
334 static double
335 get_sff_voltage(struct i2c_info *ii, uint8_t addr, uint8_t off)
336 {
337 	double d;
338 	uint8_t buf[2];
339 
340 	read_i2c(ii, addr, off, 2, buf);
341 	d = (double)((buf[0] << 8) | buf[1]);
342 	return (d / 10000);
343 }
344 
345 /*
346  * The following conversions assume internally-calibrated data.
347  * This is always true for SFF-8346, and explicitly checked for SFF-8472.
348  */
349 
350 double
351 power_mW(uint16_t power)
352 {
353 	/* Power is specified in units of 0.1 uW. */
354 	return (1.0 * power / 10000);
355 }
356 
357 double
358 power_dBm(uint16_t power)
359 {
360 	return (10.0 * log10(power_mW(power)));
361 }
362 
363 double
364 bias_mA(uint16_t bias)
365 {
366 	/* Bias current is specified in units of 2 uA. */
367 	return (1.0 * bias / 500);
368 }
369 
370 static uint16_t
371 get_sff_channel(struct i2c_info *ii, uint8_t addr, uint8_t off)
372 {
373 	uint8_t buf[2];
374 
375 	read_i2c(ii, addr, off, 2, buf);
376 	if (ii->error != 0)
377 		return (0);
378 
379 	return ((buf[0] << 8) + buf[1]);
380 }
381 
382 static int
383 get_sfp_status(struct i2c_info *ii, struct ifconfig_sfp_status *ss)
384 {
385 	uint8_t diag_type, flags;
386 
387 	/* Read diagnostic monitoring type */
388 	read_i2c(ii, SFF_8472_BASE, SFF_8472_DIAG_TYPE, 1, (caddr_t)&diag_type);
389 	if (ii->error != 0)
390 		return (-1);
391 
392 	/*
393 	 * Read monitoring data IFF it is supplied AND is
394 	 * internally calibrated
395 	 */
396 	flags = SFF_8472_DDM_DONE | SFF_8472_DDM_INTERNAL;
397 	if ((diag_type & flags) != flags) {
398 		ii->h->error.errtype = OTHER;
399 		ii->h->error.errcode = ENXIO;
400 		return (-1);
401 	}
402 
403 	ss->temp = get_sff_temp(ii, SFF_8472_DIAG, SFF_8472_TEMP);
404 	ss->voltage = get_sff_voltage(ii, SFF_8472_DIAG, SFF_8472_VCC);
405 	ss->channel = calloc(channel_count(ii->id), sizeof(*ss->channel));
406 	if (ss->channel == NULL) {
407 		ii->h->error.errtype = OTHER;
408 		ii->h->error.errcode = ENOMEM;
409 		return (-1);
410 	}
411 	ss->channel[0].rx = get_sff_channel(ii, SFF_8472_DIAG, SFF_8472_RX_POWER);
412 	ss->channel[0].tx = get_sff_channel(ii, SFF_8472_DIAG, SFF_8472_TX_BIAS);
413 	return (ii->error);
414 }
415 
416 static uint32_t
417 get_qsfp_bitrate(struct i2c_info *ii)
418 {
419 	uint8_t code;
420 	uint32_t rate;
421 
422 	code = 0;
423 	read_i2c(ii, SFF_8436_BASE, SFF_8436_BITRATE, 1, &code);
424 	rate = code * 100;
425 	if (code == 0xFF) {
426 		read_i2c(ii, SFF_8436_BASE, SFF_8636_BITRATE, 1, &code);
427 		rate = code * 250;
428 	}
429 
430 	return (rate);
431 }
432 
433 static int
434 get_qsfp_status(struct i2c_info *ii, struct ifconfig_sfp_status *ss)
435 {
436 	size_t channels;
437 
438 	ss->temp = get_sff_temp(ii, SFF_8436_BASE, SFF_8436_TEMP);
439 	ss->voltage = get_sff_voltage(ii, SFF_8436_BASE, SFF_8436_VCC);
440 	channels = channel_count(ii->id);
441 	ss->channel = calloc(channels, sizeof(*ss->channel));
442 	if (ss->channel == NULL) {
443 		ii->h->error.errtype = OTHER;
444 		ii->h->error.errcode = ENOMEM;
445 		return (-1);
446 	}
447 	for (size_t chan = 0; chan < channels; ++chan) {
448 		uint8_t rxoffs = SFF_8436_RX_CH1_MSB + chan * sizeof(uint16_t);
449 		uint8_t txoffs = SFF_8436_TX_CH1_MSB + chan * sizeof(uint16_t);
450 		ss->channel[chan].rx =
451 		    get_sff_channel(ii, SFF_8436_BASE, rxoffs);
452 		ss->channel[chan].tx =
453 		    get_sff_channel(ii, SFF_8436_BASE, txoffs);
454 	}
455 	ss->bitrate = get_qsfp_bitrate(ii);
456 	return (ii->error);
457 }
458 
459 int
460 ifconfig_sfp_get_sfp_status(ifconfig_handle_t *h, const char *name,
461     struct ifconfig_sfp_status *ss)
462 {
463 	struct i2c_info ii;
464 
465 	memset(ss, 0, sizeof(*ss));
466 
467 	if (i2c_info_init(&ii, h, name) != 0)
468 		return (-1);
469 
470 	if (ifconfig_sfp_id_is_qsfp(ii.id))
471 		return (get_qsfp_status(&ii, ss));
472 	return (get_sfp_status(&ii, ss));
473 }
474 
475 void
476 ifconfig_sfp_free_sfp_status(struct ifconfig_sfp_status *ss)
477 {
478 	if (ss != NULL)
479 		free(ss->channel);
480 }
481 
482 static const char *
483 sfp_id_string_alt(uint8_t value)
484 {
485 	const char *id;
486 
487 	if (value <= SFF_8024_ID_LAST)
488 		id = sff_8024_id[value];
489 	else if (value > 0x80)
490 		id = "Vendor specific";
491 	else
492 		id = "Reserved";
493 
494 	return (id);
495 }
496 
497 static const char *
498 sfp_conn_string_alt(uint8_t value)
499 {
500 	const char *conn;
501 
502 	if (value >= 0x0D && value <= 0x1F)
503 		conn = "Unallocated";
504 	else if (value >= 0x24 && value <= 0x7F)
505 		conn = "Unallocated";
506 	else
507 		conn = "Vendor specific";
508 
509 	return (conn);
510 }
511 
512 void
513 ifconfig_sfp_get_sfp_info_strings(const struct ifconfig_sfp_info *sfp,
514     struct ifconfig_sfp_info_strings *strings)
515 {
516 	get_sfp_info_strings(sfp, strings);
517 	if (strings->sfp_id == NULL)
518 		strings->sfp_id = sfp_id_string_alt(sfp->sfp_id);
519 	if (strings->sfp_conn == NULL)
520 		strings->sfp_conn = sfp_conn_string_alt(sfp->sfp_conn);
521 	if (strings->sfp_rev == NULL)
522 		strings->sfp_rev = "Unallocated";
523 }
524 
525 const char *
526 ifconfig_sfp_physical_spec(const struct ifconfig_sfp_info *sfp,
527     const struct ifconfig_sfp_info_strings *strings)
528 {
529 	switch (sfp->sfp_id) {
530 	case SFP_ID_UNKNOWN:
531 		break;
532 	case SFP_ID_QSFP:
533 	case SFP_ID_QSFPPLUS:
534 	case SFP_ID_QSFP28:
535 		if (sfp->sfp_eth_1040g & SFP_ETH_1040G_EXTENDED)
536 			return (strings->sfp_eth_ext);
537 		else if (sfp->sfp_eth_1040g)
538 			return (strings->sfp_eth_1040g);
539 		break;
540 	default:
541 		if (sfp->sfp_eth_ext)
542 			return (strings->sfp_eth_ext);
543 		else if (sfp->sfp_eth_10g)
544 			return (strings->sfp_eth_10g);
545 		else if (sfp->sfp_eth)
546 			return (strings->sfp_eth);
547 		break;
548 	}
549 	return ("Unknown");
550 }
551 
552 int
553 ifconfig_sfp_get_sfp_dump(ifconfig_handle_t *h, const char *name,
554     struct ifconfig_sfp_dump *dump)
555 {
556 	struct i2c_info ii;
557 	uint8_t *buf = dump->data;
558 
559 	memset(dump->data, 0, sizeof(dump->data));
560 
561 	if (i2c_info_init(&ii, h, name) != 0)
562 		return (-1);
563 
564 	if (ifconfig_sfp_id_is_qsfp(ii.id)) {
565 		read_i2c(&ii, SFF_8436_BASE, QSFP_DUMP0_START, QSFP_DUMP0_SIZE,
566 		    buf + QSFP_DUMP0_START);
567 		read_i2c(&ii, SFF_8436_BASE, QSFP_DUMP1_START, QSFP_DUMP1_SIZE,
568 		    buf + QSFP_DUMP1_START);
569 	} else {
570 		read_i2c(&ii, SFF_8472_BASE, SFP_DUMP_START, SFP_DUMP_SIZE,
571 		    buf + SFP_DUMP_START);
572 	}
573 
574 	return (ii.error != 0 ? -1 : 0);
575 }
576 
577 size_t
578 ifconfig_sfp_dump_region_count(const struct ifconfig_sfp_dump *dp)
579 {
580 	uint8_t id_byte = dp->data[0];
581 
582 	switch ((enum sfp_id)id_byte) {
583 	case SFP_ID_UNKNOWN:
584 		return (0);
585 	case SFP_ID_QSFP:
586 	case SFP_ID_QSFPPLUS:
587 	case SFP_ID_QSFP28:
588 		return (2);
589 	default:
590 		return (1);
591 	}
592 }
593