1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (C) 2018 Universita` di Pisa
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 *   1. Redistributions of source code must retain the above copyright
12 *      notice, this list of conditions and the following disclaimer.
13 *   2. Redistributions in binary form must reproduce the above copyright
14 *      notice, this list of conditions and the following disclaimer in the
15 *      documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/types.h>
31#include <sys/stat.h>
32#include <sys/ioctl.h>
33#include <sys/mman.h>
34#include <ctype.h>
35#include <fcntl.h>
36#include <inttypes.h>
37#include <stdlib.h>
38#include <stdio.h>
39#include <stdarg.h>
40#include <string.h>
41#include <unistd.h>
42#include <errno.h>
43
44//#define NMREQ_DEBUG
45#ifdef NMREQ_DEBUG
46#define NETMAP_WITH_LIBS
47#define ED(...)	D(__VA_ARGS__)
48#else
49#define ED(...)
50/* an identifier is a possibly empty sequence of alphanum characters and
51 * underscores
52 */
53static int
54nm_is_identifier(const char *s, const char *e)
55{
56	for (; s != e; s++) {
57		if (!isalnum(*s) && *s != '_') {
58			return 0;
59		}
60	}
61
62	return 1;
63}
64#endif /* NMREQ_DEBUG */
65
66#include <net/netmap_user.h>
67#define LIBNETMAP_NOTHREADSAFE
68#include "libnetmap.h"
69
70void
71nmreq_push_option(struct nmreq_header *h, struct nmreq_option *o)
72{
73	o->nro_next = h->nr_options;
74	h->nr_options = (uintptr_t)o;
75}
76
77struct nmreq_prefix {
78	const char *prefix;		/* the constant part of the prefix */
79	size_t	    len;		/* its strlen() */
80	uint32_t    flags;
81#define	NR_P_ID		(1U << 0)	/* whether an identifier is needed */
82#define NR_P_SKIP	(1U << 1)	/* whether the scope must be passed to netmap */
83#define NR_P_EMPTYID	(1U << 2)	/* whether an empty identifier is allowed */
84};
85
86#define declprefix(prefix, flags)	{ (prefix), (sizeof(prefix) - 1), (flags) }
87
88static struct nmreq_prefix nmreq_prefixes[] = {
89	declprefix("netmap", NR_P_SKIP),
90	declprefix(NM_BDG_NAME,	NR_P_ID|NR_P_EMPTYID),
91	{ NULL } /* terminate the list */
92};
93
94void
95nmreq_header_init(struct nmreq_header *h, uint16_t reqtype, void *body)
96{
97	memset(h, 0, sizeof(*h));
98	h->nr_version = NETMAP_API;
99	h->nr_reqtype = reqtype;
100	h->nr_body = (uintptr_t)body;
101}
102
103int
104nmreq_header_decode(const char **pifname, struct nmreq_header *h, struct nmctx *ctx)
105{
106	const char *scan = NULL;
107	const char *vpname = NULL;
108	const char *pipesep = NULL;
109	u_int namelen;
110	const char *ifname = *pifname;
111	struct nmreq_prefix *p;
112
113	scan = ifname;
114	for (p = nmreq_prefixes; p->prefix != NULL; p++) {
115		if (!strncmp(scan, p->prefix, p->len))
116			break;
117	}
118	if (p->prefix == NULL) {
119		nmctx_ferror(ctx, "%s: invalid request, prefix unknown or missing", *pifname);
120		goto fail;
121	}
122	scan += p->len;
123
124	vpname = index(scan, ':');
125	if (vpname == NULL) {
126		nmctx_ferror(ctx, "%s: missing ':'", ifname);
127		goto fail;
128	}
129	if (vpname != scan) {
130		/* there is an identifier, can we accept it? */
131		if (!(p->flags & NR_P_ID)) {
132			nmctx_ferror(ctx, "%s: no identifier allowed between '%s' and ':'", *pifname, p->prefix);
133			goto fail;
134		}
135
136		if (!nm_is_identifier(scan, vpname)) {
137			nmctx_ferror(ctx, "%s: invalid identifier '%.*s'", *pifname, vpname - scan, scan);
138			goto fail;
139		}
140	} else {
141		if ((p->flags & NR_P_ID) && !(p->flags & NR_P_EMPTYID)) {
142			nmctx_ferror(ctx, "%s: identifier is missing between '%s' and ':'", *pifname, p->prefix);
143			goto fail;
144		}
145	}
146	++vpname; /* skip the colon */
147	if (p->flags & NR_P_SKIP)
148		ifname = vpname;
149	scan = vpname;
150
151	/* scan for a separator */
152	for (; *scan && !index("-*^/@", *scan); scan++)
153		;
154
155	/* search for possible pipe indicators */
156	for (pipesep = vpname; pipesep != scan && !index("{}", *pipesep); pipesep++)
157		;
158
159	if (pipesep != scan) {
160		pipesep++;
161		if (*pipesep == '\0') {
162			nmctx_ferror(ctx, "%s: invalid empty pipe name", *pifname);
163			goto fail;
164		}
165		if (!nm_is_identifier(pipesep, scan)) {
166			nmctx_ferror(ctx, "%s: invalid pipe name '%.*s'", *pifname, scan - pipesep, pipesep);
167			goto fail;
168		}
169	}
170
171	namelen = scan - ifname;
172	if (namelen >= sizeof(h->nr_name)) {
173		nmctx_ferror(ctx, "name '%.*s' too long", namelen, ifname);
174		goto fail;
175	}
176	if (namelen == 0) {
177		nmctx_ferror(ctx, "%s: invalid empty port name", *pifname);
178		goto fail;
179	}
180
181	/* fill the header */
182	memcpy(h->nr_name, ifname, namelen);
183	h->nr_name[namelen] = '\0';
184	ED("name %s", h->nr_name);
185
186	*pifname = scan;
187
188	return 0;
189fail:
190	errno = EINVAL;
191	return -1;
192}
193
194
195/*
196 * 0 not recognized
197 * -1 error
198 *  >= 0 mem_id
199 */
200int32_t
201nmreq_get_mem_id(const char **pifname, struct nmctx *ctx)
202{
203	int fd = -1;
204	struct nmreq_header gh;
205	struct nmreq_port_info_get gb;
206	const char *ifname;
207
208	errno = 0;
209	ifname = *pifname;
210
211	if (ifname == NULL)
212		goto fail;
213
214	/* try to look for a netmap port with this name */
215	fd = open("/dev/netmap", O_RDWR);
216	if (fd < 0) {
217		nmctx_ferror(ctx, "cannot open /dev/netmap: %s", strerror(errno));
218		goto fail;
219	}
220	nmreq_header_init(&gh, NETMAP_REQ_PORT_INFO_GET, &gb);
221	if (nmreq_header_decode(&ifname, &gh, ctx) < 0) {
222		goto fail;
223	}
224	memset(&gb, 0, sizeof(gb));
225	if (ioctl(fd, NIOCCTRL, &gh) < 0) {
226		nmctx_ferror(ctx, "cannot get info for '%s': %s", *pifname, strerror(errno));
227		goto fail;
228	}
229	*pifname = ifname;
230	close(fd);
231	return gb.nr_mem_id;
232
233fail:
234	if (fd >= 0)
235		close(fd);
236	if (!errno)
237		errno = EINVAL;
238	return -1;
239}
240
241
242int
243nmreq_register_decode(const char **pifname, struct nmreq_register *r, struct nmctx *ctx)
244{
245	enum { P_START, P_RNGSFXOK, P_GETNUM, P_FLAGS, P_FLAGSOK, P_MEMID, P_ONESW } p_state;
246	long num;
247	const char *scan = *pifname;
248	uint32_t nr_mode;
249	uint16_t nr_mem_id;
250	uint16_t nr_ringid;
251	uint64_t nr_flags;
252
253	errno = 0;
254
255	/* fill the request */
256
257	p_state = P_START;
258	/* defaults */
259	nr_mode = NR_REG_ALL_NIC; /* default for no suffix */
260	nr_mem_id = r->nr_mem_id; /* if non-zero, further updates are disabled */
261	nr_ringid = 0;
262	nr_flags = 0;
263	while (*scan) {
264		switch (p_state) {
265		case P_START:
266			switch (*scan) {
267			case '^': /* only SW ring */
268				nr_mode = NR_REG_SW;
269				p_state = P_ONESW;
270				break;
271			case '*': /* NIC and SW */
272				nr_mode = NR_REG_NIC_SW;
273				p_state = P_RNGSFXOK;
274				break;
275			case '-': /* one NIC ring pair */
276				nr_mode = NR_REG_ONE_NIC;
277				p_state = P_GETNUM;
278				break;
279			case '/': /* start of flags */
280				p_state = P_FLAGS;
281				break;
282			case '@': /* start of memid */
283				p_state = P_MEMID;
284				break;
285			default:
286				nmctx_ferror(ctx, "unknown modifier: '%c'", *scan);
287				goto fail;
288			}
289			scan++;
290			break;
291		case P_RNGSFXOK:
292			switch (*scan) {
293			case '/':
294				p_state = P_FLAGS;
295				break;
296			case '@':
297				p_state = P_MEMID;
298				break;
299			default:
300				nmctx_ferror(ctx, "unexpected character: '%c'", *scan);
301				goto fail;
302			}
303			scan++;
304			break;
305		case P_GETNUM:
306			if (!isdigit(*scan)) {
307				nmctx_ferror(ctx, "got '%s' while expecting a number", scan);
308				goto fail;
309			}
310			num = strtol(scan, (char **)&scan, 10);
311			if (num < 0 || num >= NETMAP_RING_MASK) {
312				nmctx_ferror(ctx, "'%ld' out of range [0, %d)",
313						num, NETMAP_RING_MASK);
314				goto fail;
315			}
316			nr_ringid = num & NETMAP_RING_MASK;
317			p_state = P_RNGSFXOK;
318			break;
319		case P_FLAGS:
320		case P_FLAGSOK:
321			switch (*scan) {
322			case '@':
323				p_state = P_MEMID;
324				scan++;
325				continue;
326			case 'x':
327				nr_flags |= NR_EXCLUSIVE;
328				break;
329			case 'z':
330				nr_flags |= NR_ZCOPY_MON;
331				break;
332			case 't':
333				nr_flags |= NR_MONITOR_TX;
334				break;
335			case 'r':
336				nr_flags |= NR_MONITOR_RX;
337				break;
338			case 'R':
339				nr_flags |= NR_RX_RINGS_ONLY;
340				break;
341			case 'T':
342				nr_flags |= NR_TX_RINGS_ONLY;
343				break;
344			default:
345				nmctx_ferror(ctx, "unrecognized flag: '%c'", *scan);
346				goto fail;
347			}
348			scan++;
349			p_state = P_FLAGSOK;
350			break;
351		case P_MEMID:
352			if (!isdigit(*scan)) {
353				scan--;	/* escape to options */
354				goto out;
355			}
356			num = strtol(scan, (char **)&scan, 10);
357			if (num <= 0) {
358				nmctx_ferror(ctx, "invalid mem_id: '%ld'", num);
359				goto fail;
360			}
361			if (nr_mem_id && nr_mem_id != num) {
362				nmctx_ferror(ctx, "invalid setting of mem_id to %ld (already set to %"PRIu16")", num, nr_mem_id);
363				goto fail;
364			}
365			nr_mem_id = num;
366			p_state = P_RNGSFXOK;
367			break;
368		case P_ONESW:
369			if (!isdigit(*scan)) {
370				p_state = P_RNGSFXOK;
371			} else {
372				nr_mode = NR_REG_ONE_SW;
373				p_state = P_GETNUM;
374			}
375			break;
376		}
377	}
378	if (p_state == P_MEMID && !*scan) {
379		nmctx_ferror(ctx, "invalid empty mem_id");
380		goto fail;
381	}
382	if (p_state != P_START && p_state != P_RNGSFXOK &&
383	    p_state != P_FLAGSOK && p_state != P_MEMID && p_state != P_ONESW) {
384		nmctx_ferror(ctx, "unexpected end of request");
385		goto fail;
386	}
387out:
388	ED("flags: %s %s %s %s %s %s",
389			(nr_flags & NR_EXCLUSIVE) ? "EXCLUSIVE" : "",
390			(nr_flags & NR_ZCOPY_MON) ? "ZCOPY_MON" : "",
391			(nr_flags & NR_MONITOR_TX) ? "MONITOR_TX" : "",
392			(nr_flags & NR_MONITOR_RX) ? "MONITOR_RX" : "",
393			(nr_flags & NR_RX_RINGS_ONLY) ? "RX_RINGS_ONLY" : "",
394			(nr_flags & NR_TX_RINGS_ONLY) ? "TX_RINGS_ONLY" : "");
395	r->nr_mode = nr_mode;
396	r->nr_ringid = nr_ringid;
397	r->nr_flags = nr_flags;
398	r->nr_mem_id = nr_mem_id;
399	*pifname = scan;
400	return 0;
401
402fail:
403	if (!errno)
404		errno = EINVAL;
405	return -1;
406}
407
408
409static int
410nmreq_option_parsekeys(const char *prefix, char *body, struct nmreq_opt_parser *p,
411		struct nmreq_parse_ctx *pctx)
412{
413	char *scan;
414	char delim1;
415	struct nmreq_opt_key *k;
416
417	scan = body;
418	delim1 = *scan;
419	while (delim1 != '\0') {
420		char *key, *value;
421		char delim;
422		size_t vlen;
423
424		key = scan;
425		for ( scan++; *scan != '\0' && *scan != '=' && *scan != ','; scan++) {
426			if (*scan == '-')
427				*scan = '_';
428		}
429		delim = *scan;
430		*scan = '\0';
431		scan++;
432		for (k = p->keys; (k - p->keys) < NMREQ_OPT_MAXKEYS && k->key != NULL;
433				k++) {
434			if (!strcmp(k->key, key))
435				goto found;
436
437		}
438		nmctx_ferror(pctx->ctx, "unknown key: '%s'", key);
439		errno = EINVAL;
440		return -1;
441	found:
442		if (pctx->keys[k->id] != NULL) {
443			nmctx_ferror(pctx->ctx, "option '%s': duplicate key '%s', already set to '%s'",
444					prefix, key, pctx->keys[k->id]);
445			errno = EINVAL;
446			return -1;
447		}
448		value = scan;
449		for ( ; *scan != '\0' && *scan != ','; scan++)
450			;
451		delim1 = *scan;
452		*scan = '\0';
453		vlen = scan - value;
454		scan++;
455		if (delim == '=') {
456			pctx->keys[k->id] = (vlen ? value : NULL);
457		} else {
458			if (!(k->flags & NMREQ_OPTK_ALLOWEMPTY)) {
459				nmctx_ferror(pctx->ctx, "option '%s': missing '=value' for key '%s'",
460						prefix, key);
461				errno = EINVAL;
462				return -1;
463			}
464			pctx->keys[k->id] = key;
465		}
466	}
467	/* now check that all no-default keys have been assigned */
468	for (k = p->keys; (k - p->keys) < NMREQ_OPT_MAXKEYS && k->key != NULL; k++) {
469		if ((k->flags & NMREQ_OPTK_MUSTSET) && pctx->keys[k->id] == NULL) {
470			nmctx_ferror(pctx->ctx, "option '%s': mandatory key '%s' not assigned",
471					prefix, k->key);
472			errno = EINVAL;
473			return -1;
474		}
475	}
476	return 0;
477}
478
479
480static int
481nmreq_option_decode1(char *opt, struct nmreq_opt_parser *parsers,
482		void *token, struct nmctx *ctx)
483{
484	struct nmreq_opt_parser *p;
485	const char *prefix;
486	char *scan;
487	char delim;
488	struct nmreq_parse_ctx pctx;
489	int i;
490
491	prefix = opt;
492	/* find the delimiter */
493	for (scan = opt; *scan != '\0' && *scan != ':' && *scan != '='; scan++)
494		;
495	delim = *scan;
496	*scan = '\0';
497	scan++;
498	/* find the prefix */
499	for (p = parsers; p != NULL; p = p->next) {
500		if (!strcmp(prefix, p->prefix))
501			break;
502	}
503	if (p == NULL) {
504		nmctx_ferror(ctx, "unknown option: '%s'", prefix);
505		errno = EINVAL;
506		return -1;
507	}
508	if (p->flags & NMREQ_OPTF_DISABLED) {
509		nmctx_ferror(ctx, "option '%s' is not supported", prefix);
510		errno = EOPNOTSUPP;
511		return -1;
512	}
513	/* prepare the parse context */
514	pctx.ctx = ctx;
515	pctx.token = token;
516	for (i = 0; i < NMREQ_OPT_MAXKEYS; i++)
517		pctx.keys[i] = NULL;
518	switch (delim) {
519	case '\0':
520		/* no body */
521		if (!(p->flags & NMREQ_OPTF_ALLOWEMPTY)) {
522			nmctx_ferror(ctx, "syntax error: missing body after '%s'",
523					prefix);
524			errno = EINVAL;
525			return -1;
526		}
527		break;
528	case '=': /* the body goes to the default option key, if any */
529		if (p->default_key < 0 || p->default_key >= NMREQ_OPT_MAXKEYS) {
530			nmctx_ferror(ctx, "syntax error: '=' not valid after '%s'",
531					prefix);
532			errno = EINVAL;
533			return -1;
534		}
535		if (*scan == '\0') {
536			nmctx_ferror(ctx, "missing value for option '%s'", prefix);
537			errno = EINVAL;
538			return -1;
539		}
540		pctx.keys[p->default_key] = scan;
541		break;
542	case ':': /* parse 'key=value' strings */
543		if (nmreq_option_parsekeys(prefix, scan, p, &pctx) < 0)
544			return -1;
545		break;
546	}
547	return p->parse(&pctx);
548}
549
550int
551nmreq_options_decode(const char *opt, struct nmreq_opt_parser parsers[],
552		void *token, struct nmctx *ctx)
553{
554	const char *scan, *opt1;
555	char *w;
556	size_t len;
557	int ret;
558
559	if (*opt == '\0')
560		return 0; /* empty list, OK */
561
562	if (*opt != '@') {
563		nmctx_ferror(ctx, "option list does not start with '@'");
564		errno = EINVAL;
565		return -1;
566	}
567
568	scan = opt;
569	do {
570		scan++; /* skip the plus */
571		opt1 = scan; /* start of option */
572		/* find the end of the option */
573		for ( ; *scan != '\0' && *scan != '@'; scan++)
574			;
575		len = scan - opt1;
576		if (len == 0) {
577			nmctx_ferror(ctx, "invalid empty option");
578			errno = EINVAL;
579			return -1;
580		}
581		w = nmctx_malloc(ctx, len + 1);
582		if (w == NULL) {
583			nmctx_ferror(ctx, "out of memory");
584			errno = ENOMEM;
585			return -1;
586		}
587		memcpy(w, opt1, len);
588		w[len] = '\0';
589		ret = nmreq_option_decode1(w, parsers, token, ctx);
590		nmctx_free(ctx, w);
591		if (ret < 0)
592			return -1;
593	} while (*scan != '\0');
594
595	return 0;
596}
597
598struct nmreq_option *
599nmreq_find_option(struct nmreq_header *h, uint32_t t)
600{
601	struct nmreq_option *o = NULL;
602
603	nmreq_foreach_option(h, o) {
604		if (o->nro_reqtype == t)
605			break;
606	}
607	return o;
608}
609
610void
611nmreq_remove_option(struct nmreq_header *h, struct nmreq_option *o)
612{
613	struct nmreq_option **nmo;
614
615	for (nmo = (struct nmreq_option **)&h->nr_options; *nmo != NULL;
616	    nmo = (struct nmreq_option **)&(*nmo)->nro_next) {
617		if (*nmo == o) {
618			*((uint64_t *)(*nmo)) = o->nro_next;
619			o->nro_next = (uint64_t)(uintptr_t)NULL;
620			break;
621		}
622	}
623}
624
625void
626nmreq_free_options(struct nmreq_header *h)
627{
628	struct nmreq_option *o, *next;
629
630	/*
631	 * Note: can't use nmreq_foreach_option() here; it frees the
632	 * list as it's walking and nmreq_foreach_option() isn't
633	 * modification-safe.
634	 */
635	for (o = (struct nmreq_option *)(uintptr_t)h->nr_options; o != NULL;
636	    o = next) {
637		next = (struct nmreq_option *)(uintptr_t)o->nro_next;
638		free(o);
639	}
640}
641
642const char*
643nmreq_option_name(uint32_t nro_reqtype)
644{
645	switch (nro_reqtype) {
646	case NETMAP_REQ_OPT_EXTMEM:
647		return "extmem";
648	case NETMAP_REQ_OPT_SYNC_KLOOP_EVENTFDS:
649		return "sync-kloop-eventfds";
650	case NETMAP_REQ_OPT_CSB:
651		return "csb";
652	case NETMAP_REQ_OPT_SYNC_KLOOP_MODE:
653		return "sync-kloop-mode";
654	case NETMAP_REQ_OPT_OFFSETS:
655		return "offsets";
656	default:
657		return "unknown";
658	}
659}
660
661#if 0
662#include <inttypes.h>
663static void
664nmreq_dump(struct nmport_d *d)
665{
666	printf("header:\n");
667	printf("   nr_version:  %"PRIu16"\n", d->hdr.nr_version);
668	printf("   nr_reqtype:  %"PRIu16"\n", d->hdr.nr_reqtype);
669	printf("   nr_reserved: %"PRIu32"\n", d->hdr.nr_reserved);
670	printf("   nr_name:     %s\n", d->hdr.nr_name);
671	printf("   nr_options:  %lx\n", (unsigned long)d->hdr.nr_options);
672	printf("   nr_body:     %lx\n", (unsigned long)d->hdr.nr_body);
673	printf("\n");
674	printf("register (%p):\n", (void *)d->hdr.nr_body);
675	printf("   nr_mem_id:   %"PRIu16"\n", d->reg.nr_mem_id);
676	printf("   nr_ringid:   %"PRIu16"\n", d->reg.nr_ringid);
677	printf("   nr_mode:     %lx\n", (unsigned long)d->reg.nr_mode);
678	printf("   nr_flags:    %lx\n", (unsigned long)d->reg.nr_flags);
679	printf("\n");
680	if (d->hdr.nr_options) {
681		struct nmreq_opt_extmem *e = (struct nmreq_opt_extmem *)d->hdr.nr_options;
682		printf("opt_extmem (%p):\n", e);
683		printf("   nro_opt.nro_next:    %lx\n", (unsigned long)e->nro_opt.nro_next);
684		printf("   nro_opt.nro_reqtype: %"PRIu32"\n", e->nro_opt.nro_reqtype);
685		printf("   nro_usrptr:          %lx\n", (unsigned long)e->nro_usrptr);
686		printf("   nro_info.nr_memsize  %"PRIu64"\n", e->nro_info.nr_memsize);
687	}
688	printf("\n");
689	printf("mem (%p):\n", d->mem);
690	printf("   refcount:   %d\n", d->mem->refcount);
691	printf("   mem:        %p\n", d->mem->mem);
692	printf("   size:       %zu\n", d->mem->size);
693	printf("\n");
694	printf("rings:\n");
695	printf("   tx:   [%d, %d]\n", d->first_tx_ring, d->last_tx_ring);
696	printf("   rx:   [%d, %d]\n", d->first_rx_ring, d->last_rx_ring);
697}
698int
699main(int argc, char *argv[])
700{
701	struct nmport_d *d;
702
703	if (argc < 2) {
704		fprintf(stderr, "usage: %s netmap-expr\n", argv[0]);
705		return 1;
706	}
707
708	d = nmport_open(argv[1]);
709	if (d != NULL) {
710		nmreq_dump(d);
711		nmport_close(d);
712	}
713
714	return 0;
715}
716#endif
717