summaryrefslogtreecommitdiffstats
path: root/samples/bpf/xdpsock_user.c
blob: b71a342b90825b8b553b83e7908db179ed99bfb9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2017 - 2018 Intel Corporation. */

#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <libgen.h>
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <linux/if_xdp.h>
#include <linux/if_ether.h>
#include <net/if.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <net/ethernet.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <pthread.h>
#include <locale.h>
#include <sys/types.h>
#include <poll.h>

#include "bpf_load.h"
#include "bpf_util.h"
#include <bpf/bpf.h>

#include "xdpsock.h"

#ifndef SOL_XDP
#define SOL_XDP 283
#endif

#ifndef AF_XDP
#define AF_XDP 44
#endif

#ifndef PF_XDP
#define PF_XDP AF_XDP
#endif

#define NUM_FRAMES 131072
#define FRAME_HEADROOM 0
#define FRAME_SHIFT 11
#define FRAME_SIZE 2048
#define NUM_DESCS 1024
#define BATCH_SIZE 16

#define FQ_NUM_DESCS 1024
#define CQ_NUM_DESCS 1024

#define DEBUG_HEXDUMP 0

typedef __u64 u64;
typedef __u32 u32;

static unsigned long prev_time;

enum benchmark_type {
	BENCH_RXDROP = 0,
	BENCH_TXONLY = 1,
	BENCH_L2FWD = 2,
};

static enum benchmark_type opt_bench = BENCH_RXDROP;
static u32 opt_xdp_flags;
static const char *opt_if = "";
static int opt_ifindex;
static int opt_queue;
static int opt_poll;
static int opt_shared_packet_buffer;
static int opt_interval = 1;

struct xdp_umem_uqueue {
	u32 cached_prod;
	u32 cached_cons;
	u32 mask;
	u32 size;
	u32 *producer;
	u32 *consumer;
	u64 *ring;
	void *map;
};

struct xdp_umem {
	char *frames;
	struct xdp_umem_uqueue fq;
	struct xdp_umem_uqueue cq;
	int fd;
};

struct xdp_uqueue {
	u32 cached_prod;
	u32 cached_cons;
	u32 mask;
	u32 size;
	u32 *producer;
	u32 *consumer;
	struct xdp_desc *ring;
	void *map;
};

struct xdpsock {
	struct xdp_uqueue rx;
	struct xdp_uqueue tx;
	int sfd;
	struct xdp_umem *umem;
	u32 outstanding_tx;
	unsigned long rx_npkts;
	unsigned long tx_npkts;
	unsigned long prev_rx_npkts;
	unsigned long prev_tx_npkts;
};

#define MAX_SOCKS 4
static int num_socks;
struct xdpsock *xsks[MAX_SOCKS];

static unsigned long get_nsecs(void)
{
	struct timespec ts;

	clock_gettime(CLOCK_MONOTONIC, &ts);
	return ts.tv_sec * 1000000000UL + ts.tv_nsec;
}

static void dump_stats(void);

#define lassert(expr)							\
	do {								\
		if (!(expr)) {						\
			fprintf(stderr, "%s:%s:%i: Assertion failed: "	\
				#expr ": errno: %d/\"%s\"\n",		\
				__FILE__, __func__, __LINE__,		\
				errno, strerror(errno));		\
			dump_stats();					\
			exit(EXIT_FAILURE);				\
		}							\
	} while (0)

#define barrier() __asm__ __volatile__("": : :"memory")
#define u_smp_rmb() barrier()
#define u_smp_wmb() barrier()
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)

static const char pkt_data[] =
	"\x3c\xfd\xfe\x9e\x7f\x71\xec\xb1\xd7\x98\x3a\xc0\x08\x00\x45\x00"
	"\x00\x2e\x00\x00\x00\x00\x40\x11\x88\x97\x05\x08\x07\x08\xc8\x14"
	"\x1e\x04\x10\x92\x10\x92\x00\x1a\x6d\xa3\x34\x33\x1f\x69\x40\x6b"
	"\x54\x59\xb6\x14\x2d\x11\x44\xbf\xaf\xd9\xbe\xaa";

static inline u32 umem_nb_free(struct xdp_umem_uqueue *q, u32 nb)
{
	u32 free_entries = q->size - (q->cached_prod - q->cached_cons);

	if (free_entries >= nb)
		return free_entries;

	/* Refresh the local tail pointer */
	q->cached_cons = *q->consumer;

	return q->size - (q->cached_prod - q->cached_cons);
}

static inline u32 xq_nb_free(struct xdp_uqueue *q, u32 ndescs)
{
	u32 free_entries = q->cached_cons - q->cached_prod;

	if (free_entries >= ndescs)
		return free_entries;

	/* Refresh the local tail pointer */
	q->cached_cons = *q->consumer + q->size;
	return q->cached_cons - q->cached_prod;
}

static inline u32 umem_nb_avail(struct xdp_umem_uqueue *q, u32 nb)
{
	u32 entries = q->cached_prod - q->cached_cons;

	if (entries == 0) {
		q->cached_prod = *q->producer;
		entries = q->cached_prod - q->cached_cons;
	}

	return (entries > nb) ? nb : entries;
}

static inline u32 xq_nb_avail(struct xdp_uqueue *q, u32 ndescs)
{
	u32 entries = q->cached_prod - q->cached_cons;

	if (entries == 0) {
		q->cached_prod = *q->producer;
		entries = q->cached_prod - q->cached_cons;
	}

	return (entries > ndescs) ? ndescs : entries;
}

static inline int umem_fill_to_kernel_ex(struct xdp_umem_uqueue *fq,
					 struct xdp_desc *d,
					 size_t nb)
{
	u32 i;

	if (umem_nb_free(fq, nb) < nb)
		return -ENOSPC;

	for (i = 0; i < nb; i++) {
		u32 idx = fq->cached_prod++ & fq->mask;

		fq->ring[idx] = d[i].addr;
	}

	u_smp_wmb();

	*fq->producer = fq->cached_prod;

	return 0;
}

static inline int umem_fill_to_kernel(struct xdp_umem_uqueue *fq, u64 *d,
				      size_t nb)
{
	u32 i;

	if (umem_nb_free(fq, nb) < nb)
		return -ENOSPC;

	for (i = 0; i < nb; i++) {
		u32 idx = fq->cached_prod++ & fq->mask;

		fq->ring[idx] = d[i];
	}

	u_smp_wmb();

	*fq->producer = fq->cached_prod;

	return 0;
}

static inline size_t umem_complete_from_kernel(struct xdp_umem_uqueue *cq,
					       u64 *d, size_t nb)
{
	u32 idx, i, entries = umem_nb_avail(cq, nb);

	u_smp_rmb();

	for (i = 0; i < entries; i++) {
		idx = cq->cached_cons++ & cq->mask;
		d[i] = cq->ring[idx];
	}

	if (entries > 0) {
		u_smp_wmb();

		*cq->consumer = cq->cached_cons;
	}

	return entries;
}

static inline void *xq_get_data(struct xdpsock *xsk, u64 addr)
{
	return &xsk->umem->frames[addr];
}

static inline int xq_enq(struct xdp_uqueue *uq,
			 const struct xdp_desc *descs,
			 unsigned int ndescs)
{
	struct xdp_desc *r = uq->ring;
	unsigned int i;

	if (xq_nb_free(uq, ndescs) < ndescs)
		return -ENOSPC;

	for (i = 0; i < ndescs; i++) {
		u32 idx = uq->cached_prod++ & uq->mask;

		r[idx].addr = descs[i].addr;
		r[idx].len = descs[i].len;
	}

	u_smp_wmb();

	*uq->producer = uq->cached_prod;
	return 0;
}

static inline int xq_enq_tx_only(struct xdp_uqueue *uq,
				 unsigned int id, unsigned int ndescs)
{
	struct xdp_desc *r = uq->ring;
	unsigned int i;

	if (xq_nb_free(uq, ndescs) < ndescs)
		return -ENOSPC;

	for (i = 0; i < ndescs; i++) {
		u32 idx = uq->cached_prod++ & uq->mask;

		r[idx].addr	= (id + i) << FRAME_SHIFT;
		r[idx].len	= sizeof(pkt_data) - 1;
	}

	u_smp_wmb();

	*uq->producer = uq->cached_prod;
	return 0;
}

static inline int xq_deq(struct xdp_uqueue *uq,
			 struct xdp_desc *descs,
			 int ndescs)
{
	struct xdp_desc *r = uq->ring;
	unsigned int idx;
	int i, entries;

	entries = xq_nb_avail(uq, ndescs);

	u_smp_rmb();

	for (i = 0; i < entries; i++) {
		idx = uq->cached_cons++ & uq->mask;
		descs[i] = r[idx];
	}

	if (entries > 0) {
		u_smp_wmb();

		*uq->consumer = uq->cached_cons;
	}

	return entries;
}

static void swap_mac_addresses(void *data)
{
	struct ether_header *eth = (struct ether_header *)data;
	struct ether_addr *src_addr = (struct ether_addr *)&eth->ether_shost;
	struct ether_addr *dst_addr = (struct ether_addr *)&eth->ether_dhost;
	struct ether_addr tmp;

	tmp = *src_addr;
	*src_addr = *dst_addr;
	*dst_addr = tmp;
}

static void hex_dump(void *pkt, size_t length, u64 addr)
{
	const unsigned char *address = (unsigned char *)pkt;
	const unsigned char *line = address;
	size_t line_size = 32;
	unsigned char c;
	char buf[32];
	int i = 0;

	if (!DEBUG_HEXDUMP)
		return;

	sprintf(buf, "addr=%llu", addr);
	printf("length = %zu\n", length);
	printf("%s | ", buf);
	while (length-- > 0) {
		printf("%02X ", *address++);
		if (!(++i % line_size) || (length == 0 && i % line_size)) {
			if (length == 0) {
				while (i++ % line_size)
					printf("__ ");
			}
			printf(" | ");	/* right close */
			while (line < address) {
				c = *line++;
				printf("%c", (c < 33 || c == 255) ? 0x2E : c);
			}
			printf("\n");
			if (length > 0)
				printf("%s | ", buf);
		}
	}
	printf("\n");
}

static size_t gen_eth_frame(char *frame)
{
	memcpy(frame, pkt_data, sizeof(pkt_data) - 1);
	return sizeof(pkt_data) - 1;
}

static struct xdp_umem *xdp_umem_configure(int sfd)
{
	int fq_size = FQ_NUM_DESCS, cq_size = CQ_NUM_DESCS;
	struct xdp_mmap_offsets off;
	struct xdp_umem_reg mr;
	struct xdp_umem *umem;
	socklen_t optlen;
	void *bufs;

	umem = calloc(1, sizeof(*umem));
	lassert(umem);

	lassert(posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */
			       NUM_FRAMES * FRAME_SIZE) == 0);

	mr.addr = (__u64)bufs;
	mr.len = NUM_FRAMES * FRAME_SIZE;
	mr.chunk_size = FRAME_SIZE;
	mr.headroom = FRAME_HEADROOM;

	lassert(setsockopt(sfd, SOL_XDP, XDP_UMEM_REG, &mr, sizeof(mr)) == 0);
	lassert(setsockopt(sfd, SOL_XDP, XDP_UMEM_FILL_RING, &fq_size,
			   sizeof(int)) == 0);
	lassert(setsockopt(sfd, SOL_XDP, XDP_UMEM_COMPLETION_RING, &cq_size,
			   sizeof(int)) == 0);

	optlen = sizeof(off);
	lassert(getsockopt(sfd, SOL_XDP, XDP_MMAP_OFFSETS, &off,
			   &optlen) == 0);

	umem->fq.map = mmap(0, off.fr.desc +
			    FQ_NUM_DESCS * sizeof(u64),
			    PROT_READ | PROT_WRITE,
			    MAP_SHARED | MAP_POPULATE, sfd,
			    XDP_UMEM_PGOFF_FILL_RING);
	lassert(umem->fq.map != MAP_FAILED);

	umem->fq.mask = FQ_NUM_DESCS - 1;
	umem->fq.size = FQ_NUM_DESCS;
	umem->fq.producer = umem->fq.map + off.fr.producer;
	umem->fq.consumer = umem->fq.map + off.fr.consumer;
	umem->fq.ring = umem->fq.map + off.fr.desc;

	umem->cq.map = mmap(0, off.cr.desc +
			     CQ_NUM_DESCS * sizeof(u64),
			     PROT_READ | PROT_WRITE,
			     MAP_SHARED | MAP_POPULATE, sfd,
			     XDP_UMEM_PGOFF_COMPLETION_RING);
	lassert(umem->cq.map != MAP_FAILED);

	umem->cq.mask = CQ_NUM_DESCS - 1;
	umem->cq.size = CQ_NUM_DESCS;
	umem->cq.producer = umem->cq.map + off.cr.producer;
	umem->cq.consumer = umem->cq.map + off.cr.consumer;
	umem->cq.ring = umem->cq.map + off.cr.desc;

	umem->frames = bufs;
	umem->fd = sfd;

	if (opt_bench == BENCH_TXONLY) {
		int i;

		for (i = 0; i < NUM_FRAMES * FRAME_SIZE; i += FRAME_SIZE)
			(void)gen_eth_frame(&umem->frames[i]);
	}

	return umem;
}

static struct xdpsock *xsk_configure(struct xdp_umem *umem)
{
	struct sockaddr_xdp sxdp = {};
	struct xdp_mmap_offsets off;
	int sfd, ndescs = NUM_DESCS;
	struct xdpsock *xsk;
	bool shared = true;
	socklen_t optlen;
	u64 i;

	sfd = socket(PF_XDP, SOCK_RAW, 0);
	lassert(sfd >= 0);

	xsk = calloc(1, sizeof(*xsk));
	lassert(xsk);

	xsk->sfd = sfd;
	xsk->outstanding_tx = 0;

	if (!umem) {
		shared = false;
		xsk->umem = xdp_umem_configure(sfd);
	} else {
		xsk->umem = umem;
	}

	lassert(setsockopt(sfd, SOL_XDP, XDP_RX_RING,
			   &ndescs, sizeof(int)) == 0);
	lassert(setsockopt(sfd, SOL_XDP, XDP_TX_RING,
			   &ndescs, sizeof(int)) == 0);
	optlen = sizeof(off);
	lassert(getsockopt(sfd, SOL_XDP, XDP_MMAP_OFFSETS, &off,
			   &optlen) == 0);

	/* Rx */
	xsk->rx.map = mmap(NULL,
			   off.rx.desc +
			   NUM_DESCS * sizeof(struct xdp_desc),
			   PROT_READ | PROT_WRITE,
			   MAP_SHARED | MAP_POPULATE, sfd,
			   XDP_PGOFF_RX_RING);
	lassert(xsk->rx.map != MAP_FAILED);

	if (!shared) {
		for (i = 0; i < NUM_DESCS * FRAME_SIZE; i += FRAME_SIZE)
			lassert(umem_fill_to_kernel(&xsk->umem->fq, &i, 1)
				== 0);
	}

	/* Tx */
	xsk->tx.map = mmap(NULL,
			   off.tx.desc +
			   NUM_DESCS * sizeof(struct xdp_desc),
			   PROT_READ | PROT_WRITE,
			   MAP_SHARED | MAP_POPULATE, sfd,
			   XDP_PGOFF_TX_RING);
	lassert(xsk->tx.map != MAP_FAILED);

	xsk->rx.mask = NUM_DESCS - 1;
	xsk->rx.size = NUM_DESCS;
	xsk->rx.producer = xsk->rx.map + off.rx.producer;
	xsk->rx.consumer = xsk->rx.map + off.rx.consumer;
	xsk->rx.ring = xsk->rx.map + off.rx.desc;

	xsk->tx.mask = NUM_DESCS - 1;
	xsk->tx.size = NUM_DESCS;
	xsk->tx.producer = xsk->tx.map + off.tx.producer;
	xsk->tx.consumer = xsk->tx.map + off.tx.consumer;
	xsk->tx.ring = xsk->tx.map + off.tx.desc;

	sxdp.sxdp_family = PF_XDP;
	sxdp.sxdp_ifindex = opt_ifindex;
	sxdp.sxdp_queue_id = opt_queue;
	if (shared) {
		sxdp.sxdp_flags = XDP_SHARED_UMEM;
		sxdp.sxdp_shared_umem_fd = umem->fd;
	}

	lassert(bind(sfd, (struct sockaddr *)&sxdp, sizeof(sxdp)) == 0);

	return xsk;
}

static void print_benchmark(bool running)
{
	const char *bench_str = "INVALID";

	if (opt_bench == BENCH_RXDROP)
		bench_str = "rxdrop";
	else if (opt_bench == BENCH_TXONLY)
		bench_str = "txonly";
	else if (opt_bench == BENCH_L2FWD)
		bench_str = "l2fwd";

	printf("%s:%d %s ", opt_if, opt_queue, bench_str);
	if (opt_xdp_flags & XDP_FLAGS_SKB_MODE)
		printf("xdp-skb ");
	else if (opt_xdp_flags & XDP_FLAGS_DRV_MODE)
		printf("xdp-drv ");
	else
		printf("	");

	if (opt_poll)
		printf("poll() ");

	if (running) {
		printf("running...");
		fflush(stdout);
	}
}

static void dump_stats(void)
{
	unsigned long now = get_nsecs();
	long dt = now - prev_time;
	int i;

	prev_time = now;

	for (i = 0; i < num_socks; i++) {
		char *fmt = "%-15s %'-11.0f %'-11lu\n";
		double rx_pps, tx_pps;

		rx_pps = (xsks[i]->rx_npkts - xsks[i]->prev_rx_npkts) *
			 1000000000. / dt;
		tx_pps = (xsks[i]->tx_npkts - xsks[i]->prev_tx_npkts) *
			 1000000000. / dt;

		printf("\n sock%d@", i);
		print_benchmark(false);
		printf("\n");

		printf("%-15s %-11s %-11s %-11.2f\n", "", "pps", "pkts",
		       dt / 1000000000.);
		printf(fmt, "rx", rx_pps, xsks[i]->rx_npkts);
		printf(fmt, "tx", tx_pps, xsks[i]->tx_npkts);

		xsks[i]->prev_rx_npkts = xsks[i]->rx_npkts;
		xsks[i]->prev_tx_npkts = xsks[i]->tx_npkts;
	}
}

static void *poller(void *arg)
{
	(void)arg;
	for (;;) {
		sleep(opt_interval);
		dump_stats();
	}

	return NULL;
}

static void int_exit(int sig)
{
	(void)sig;
	dump_stats();
	bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
	exit(EXIT_SUCCESS);
}

static struct option long_options[] = {
	{"rxdrop", no_argument, 0, 'r'},
	{"txonly", no_argument, 0, 't'},
	{"l2fwd", no_argument, 0, 'l'},
	{"interface", required_argument, 0, 'i'},
	{"queue", required_argument, 0, 'q'},
	{"poll", no_argument, 0, 'p'},
	{"shared-buffer", no_argument, 0, 's'},
	{"xdp-skb", no_argument, 0, 'S'},
	{"xdp-native", no_argument, 0, 'N'},
	{"interval", required_argument, 0, 'n'},
	{0, 0, 0, 0}
};

static void usage(const char *prog)
{
	const char *str =
		"  Usage: %s [OPTIONS]\n"
		"  Options:\n"
		"  -r, --rxdrop		Discard all incoming packets (default)\n"
		"  -t, --txonly		Only send packets\n"
		"  -l, --l2fwd		MAC swap L2 forwarding\n"
		"  -i, --interface=n	Run on interface n\n"
		"  -q, --queue=n	Use queue n (default 0)\n"
		"  -p, --poll		Use poll syscall\n"
		"  -s, --shared-buffer	Use shared packet buffer\n"
		"  -S, --xdp-skb=n	Use XDP skb-mod\n"
		"  -N, --xdp-native=n	Enfore XDP native mode\n"
		"  -n, --interval=n	Specify statistics update interval (default 1 sec).\n"
		"\n";
	fprintf(stderr, str, prog);
	exit(EXIT_FAILURE);
}

static void parse_command_line(int argc, char **argv)
{
	int option_index, c;

	opterr = 0;

	for (;;) {
		c = getopt_long(argc, argv, "rtli:q:psSNn:", long_options,
				&option_index);
		if (c == -1)
			break;

		switch (c) {
		case 'r':
			opt_bench = BENCH_RXDROP;
			break;
		case 't':
			opt_bench = BENCH_TXONLY;
			break;
		case 'l':
			opt_bench = BENCH_L2FWD;
			break;
		case 'i':
			opt_if = optarg;
			break;
		case 'q':
			opt_queue = atoi(optarg);
			break;
		case 's':
			opt_shared_packet_buffer = 1;
			break;
		case 'p':
			opt_poll = 1;
			break;
		case 'S':
			opt_xdp_flags |= XDP_FLAGS_SKB_MODE;
			break;
		case 'N':
			opt_xdp_flags |= XDP_FLAGS_DRV_MODE;
			break;
		case 'n':
			opt_interval = atoi(optarg);
			break;
		default:
			usage(basename(argv[0]));
		}
	}

	opt_ifindex = if_nametoindex(opt_if);
	if (!opt_ifindex) {
		fprintf(stderr, "ERROR: interface \"%s\" does not exist\n",
			opt_if);
		usage(basename(argv[0]));
	}
}

static void kick_tx(int fd)
{
	int ret;

	ret = sendto(fd, NULL, 0, MSG_DONTWAIT, NULL, 0);
	if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN)
		return;
	lassert(0);
}

static inline void complete_tx_l2fwd(struct xdpsock *xsk)
{
	u64 descs[BATCH_SIZE];
	unsigned int rcvd;
	size_t ndescs;

	if (!xsk->outstanding_tx)
		return;

	kick_tx(xsk->sfd);
	ndescs = (xsk->outstanding_tx > BATCH_SIZE) ? BATCH_SIZE :
		 xsk->outstanding_tx;

	/* re-add completed Tx buffers */
	rcvd = umem_complete_from_kernel(&xsk->umem->cq, descs, ndescs);
	if (rcvd > 0) {
		umem_fill_to_kernel(&xsk->umem->fq, descs, rcvd);
		xsk->outstanding_tx -= rcvd;
		xsk->tx_npkts += rcvd;
	}
}

static inline void complete_tx_only(struct xdpsock *xsk)
{
	u64 descs[BATCH_SIZE];
	unsigned int rcvd;

	if (!xsk->outstanding_tx)
		return;

	kick_tx(xsk->sfd);

	rcvd = umem_complete_from_kernel(&xsk->umem->cq, descs, BATCH_SIZE);
	if (rcvd > 0) {
		xsk->outstanding_tx -= rcvd;
		xsk->tx_npkts += rcvd;
	}
}

static void rx_drop(struct xdpsock *xsk)
{
	struct xdp_desc descs[BATCH_SIZE];
	unsigned int rcvd, i;

	rcvd = xq_deq(&xsk->rx, descs, BATCH_SIZE);
	if (!rcvd)
		return;

	for (i = 0; i < rcvd; i++) {
		char *pkt = xq_get_data(xsk, descs[i].addr);

		hex_dump(pkt, descs[i].len, descs[i].addr);
	}

	xsk->rx_npkts += rcvd;

	umem_fill_to_kernel_ex(&xsk->umem->fq, descs, rcvd);
}

static void rx_drop_all(void)
{
	struct pollfd fds[MAX_SOCKS + 1];
	int i, ret, timeout, nfds = 1;

	memset(fds, 0, sizeof(fds));

	for (i = 0; i < num_socks; i++) {
		fds[i].fd = xsks[i]->sfd;
		fds[i].events = POLLIN;
		timeout = 1000; /* 1sn */
	}

	for (;;) {
		if (opt_poll) {
			ret = poll(fds, nfds, timeout);
			if (ret <= 0)
				continue;
		}

		for (i = 0; i < num_socks; i++)
			rx_drop(xsks[i]);
	}
}

static void tx_only(struct xdpsock *xsk)
{
	int timeout, ret, nfds = 1;
	struct pollfd fds[nfds + 1];
	unsigned int idx = 0;

	memset(fds, 0, sizeof(fds));
	fds[0].fd = xsk->sfd;
	fds[0].events = POLLOUT;
	timeout = 1000; /* 1sn */

	for (;;) {
		if (opt_poll) {
			ret = poll(fds, nfds, timeout);
			if (ret <= 0)
				continue;

			if (fds[0].fd != xsk->sfd ||
			    !(fds[0].revents & POLLOUT))
				continue;
		}

		if (xq_nb_free(&xsk->tx, BATCH_SIZE) >= BATCH_SIZE) {
			lassert(xq_enq_tx_only(&xsk->tx, idx, BATCH_SIZE) == 0);

			xsk->outstanding_tx += BATCH_SIZE;
			idx += BATCH_SIZE;
			idx %= NUM_FRAMES;
		}

		complete_tx_only(xsk);
	}
}

static void l2fwd(struct xdpsock *xsk)
{
	for (;;) {
		struct xdp_desc descs[BATCH_SIZE];
		unsigned int rcvd, i;
		int ret;

		for (;;) {
			complete_tx_l2fwd(xsk);

			rcvd = xq_deq(&xsk->rx, descs, BATCH_SIZE);
			if (rcvd > 0)
				break;
		}

		for (i = 0; i < rcvd; i++) {
			char *pkt = xq_get_data(xsk, descs[i].addr);

			swap_mac_addresses(pkt);

			hex_dump(pkt, descs[i].len, descs[i].addr);
		}

		xsk->rx_npkts += rcvd;

		ret = xq_enq(&xsk->tx, descs, rcvd);
		lassert(ret == 0);
		xsk->outstanding_tx += rcvd;
	}
}

int main(int argc, char **argv)
{
	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
	char xdp_filename[256];
	int i, ret, key = 0;
	pthread_t pt;

	parse_command_line(argc, argv);

	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
		fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n",
			strerror(errno));
		exit(EXIT_FAILURE);
	}

	snprintf(xdp_filename, sizeof(xdp_filename), "%s_kern.o", argv[0]);

	if (load_bpf_file(xdp_filename)) {
		fprintf(stderr, "ERROR: load_bpf_file %s\n", bpf_log_buf);
		exit(EXIT_FAILURE);
	}

	if (!prog_fd[0]) {
		fprintf(stderr, "ERROR: load_bpf_file: \"%s\"\n",
			strerror(errno));
		exit(EXIT_FAILURE);
	}

	if (bpf_set_link_xdp_fd(opt_ifindex, prog_fd[0], opt_xdp_flags) < 0) {
		fprintf(stderr, "ERROR: link set xdp fd failed\n");
		exit(EXIT_FAILURE);
	}

	ret = bpf_map_update_elem(map_fd[0], &key, &opt_queue, 0);
	if (ret) {
		fprintf(stderr, "ERROR: bpf_map_update_elem qidconf\n");
		exit(EXIT_FAILURE);
	}

	/* Create sockets... */
	xsks[num_socks++] = xsk_configure(NULL);

#if RR_LB
	for (i = 0; i < MAX_SOCKS - 1; i++)
		xsks[num_socks++] = xsk_configure(xsks[0]->umem);
#endif

	/* ...and insert them into the map. */
	for (i = 0; i < num_socks; i++) {
		key = i;
		ret = bpf_map_update_elem(map_fd[1], &key, &xsks[i]->sfd, 0);
		if (ret) {
			fprintf(stderr, "ERROR: bpf_map_update_elem %d\n", i);
			exit(EXIT_FAILURE);
		}
	}

	signal(SIGINT, int_exit);
	signal(SIGTERM, int_exit);
	signal(SIGABRT, int_exit);

	setlocale(LC_ALL, "");

	ret = pthread_create(&pt, NULL, poller, NULL);
	lassert(ret == 0);

	prev_time = get_nsecs();

	if (opt_bench == BENCH_RXDROP)
		rx_drop_all();
	else if (opt_bench == BENCH_TXONLY)
		tx_only(xsks[0]);
	else
		l2fwd(xsks[0]);

	return 0;
}