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TOMOYO Linux Cross Reference
Linux/samples/bpf/xdpsock_user.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright(c) 2017 - 2018 Intel Corporation. */
  3 
  4 #include <asm/barrier.h>
  5 #include <errno.h>
  6 #include <getopt.h>
  7 #include <libgen.h>
  8 #include <linux/bpf.h>
  9 #include <linux/compiler.h>
 10 #include <linux/if_link.h>
 11 #include <linux/if_xdp.h>
 12 #include <linux/if_ether.h>
 13 #include <linux/ip.h>
 14 #include <linux/limits.h>
 15 #include <linux/udp.h>
 16 #include <arpa/inet.h>
 17 #include <locale.h>
 18 #include <net/ethernet.h>
 19 #include <net/if.h>
 20 #include <poll.h>
 21 #include <pthread.h>
 22 #include <signal.h>
 23 #include <stdbool.h>
 24 #include <stdio.h>
 25 #include <stdlib.h>
 26 #include <string.h>
 27 #include <sys/capability.h>
 28 #include <sys/mman.h>
 29 #include <sys/resource.h>
 30 #include <sys/socket.h>
 31 #include <sys/types.h>
 32 #include <sys/un.h>
 33 #include <time.h>
 34 #include <unistd.h>
 35 
 36 #include <bpf/libbpf.h>
 37 #include <bpf/xsk.h>
 38 #include <bpf/bpf.h>
 39 #include "xdpsock.h"
 40 
 41 #ifndef SOL_XDP
 42 #define SOL_XDP 283
 43 #endif
 44 
 45 #ifndef AF_XDP
 46 #define AF_XDP 44
 47 #endif
 48 
 49 #ifndef PF_XDP
 50 #define PF_XDP AF_XDP
 51 #endif
 52 
 53 #define NUM_FRAMES (4 * 1024)
 54 #define MIN_PKT_SIZE 64
 55 
 56 #define DEBUG_HEXDUMP 0
 57 
 58 typedef __u64 u64;
 59 typedef __u32 u32;
 60 typedef __u16 u16;
 61 typedef __u8  u8;
 62 
 63 static unsigned long prev_time;
 64 
 65 enum benchmark_type {
 66         BENCH_RXDROP = 0,
 67         BENCH_TXONLY = 1,
 68         BENCH_L2FWD = 2,
 69 };
 70 
 71 static enum benchmark_type opt_bench = BENCH_RXDROP;
 72 static u32 opt_xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 73 static const char *opt_if = "";
 74 static int opt_ifindex;
 75 static int opt_queue;
 76 static unsigned long opt_duration;
 77 static unsigned long start_time;
 78 static bool benchmark_done;
 79 static u32 opt_batch_size = 64;
 80 static int opt_pkt_count;
 81 static u16 opt_pkt_size = MIN_PKT_SIZE;
 82 static u32 opt_pkt_fill_pattern = 0x12345678;
 83 static bool opt_extra_stats;
 84 static bool opt_quiet;
 85 static bool opt_app_stats;
 86 static const char *opt_irq_str = "";
 87 static u32 irq_no;
 88 static int irqs_at_init = -1;
 89 static int opt_poll;
 90 static int opt_interval = 1;
 91 static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
 92 static u32 opt_umem_flags;
 93 static int opt_unaligned_chunks;
 94 static int opt_mmap_flags;
 95 static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
 96 static int opt_timeout = 1000;
 97 static bool opt_need_wakeup = true;
 98 static u32 opt_num_xsks = 1;
 99 static u32 prog_id;
100 static bool opt_busy_poll;
101 static bool opt_reduced_cap;
102 
103 struct xsk_ring_stats {
104         unsigned long rx_npkts;
105         unsigned long tx_npkts;
106         unsigned long rx_dropped_npkts;
107         unsigned long rx_invalid_npkts;
108         unsigned long tx_invalid_npkts;
109         unsigned long rx_full_npkts;
110         unsigned long rx_fill_empty_npkts;
111         unsigned long tx_empty_npkts;
112         unsigned long prev_rx_npkts;
113         unsigned long prev_tx_npkts;
114         unsigned long prev_rx_dropped_npkts;
115         unsigned long prev_rx_invalid_npkts;
116         unsigned long prev_tx_invalid_npkts;
117         unsigned long prev_rx_full_npkts;
118         unsigned long prev_rx_fill_empty_npkts;
119         unsigned long prev_tx_empty_npkts;
120 };
121 
122 struct xsk_driver_stats {
123         unsigned long intrs;
124         unsigned long prev_intrs;
125 };
126 
127 struct xsk_app_stats {
128         unsigned long rx_empty_polls;
129         unsigned long fill_fail_polls;
130         unsigned long copy_tx_sendtos;
131         unsigned long tx_wakeup_sendtos;
132         unsigned long opt_polls;
133         unsigned long prev_rx_empty_polls;
134         unsigned long prev_fill_fail_polls;
135         unsigned long prev_copy_tx_sendtos;
136         unsigned long prev_tx_wakeup_sendtos;
137         unsigned long prev_opt_polls;
138 };
139 
140 struct xsk_umem_info {
141         struct xsk_ring_prod fq;
142         struct xsk_ring_cons cq;
143         struct xsk_umem *umem;
144         void *buffer;
145 };
146 
147 struct xsk_socket_info {
148         struct xsk_ring_cons rx;
149         struct xsk_ring_prod tx;
150         struct xsk_umem_info *umem;
151         struct xsk_socket *xsk;
152         struct xsk_ring_stats ring_stats;
153         struct xsk_app_stats app_stats;
154         struct xsk_driver_stats drv_stats;
155         u32 outstanding_tx;
156 };
157 
158 static int num_socks;
159 struct xsk_socket_info *xsks[MAX_SOCKS];
160 int sock;
161 
162 static unsigned long get_nsecs(void)
163 {
164         struct timespec ts;
165 
166         clock_gettime(CLOCK_MONOTONIC, &ts);
167         return ts.tv_sec * 1000000000UL + ts.tv_nsec;
168 }
169 
170 static void print_benchmark(bool running)
171 {
172         const char *bench_str = "INVALID";
173 
174         if (opt_bench == BENCH_RXDROP)
175                 bench_str = "rxdrop";
176         else if (opt_bench == BENCH_TXONLY)
177                 bench_str = "txonly";
178         else if (opt_bench == BENCH_L2FWD)
179                 bench_str = "l2fwd";
180 
181         printf("%s:%d %s ", opt_if, opt_queue, bench_str);
182         if (opt_xdp_flags & XDP_FLAGS_SKB_MODE)
183                 printf("xdp-skb ");
184         else if (opt_xdp_flags & XDP_FLAGS_DRV_MODE)
185                 printf("xdp-drv ");
186         else
187                 printf("        ");
188 
189         if (opt_poll)
190                 printf("poll() ");
191 
192         if (running) {
193                 printf("running...");
194                 fflush(stdout);
195         }
196 }
197 
198 static int xsk_get_xdp_stats(int fd, struct xsk_socket_info *xsk)
199 {
200         struct xdp_statistics stats;
201         socklen_t optlen;
202         int err;
203 
204         optlen = sizeof(stats);
205         err = getsockopt(fd, SOL_XDP, XDP_STATISTICS, &stats, &optlen);
206         if (err)
207                 return err;
208 
209         if (optlen == sizeof(struct xdp_statistics)) {
210                 xsk->ring_stats.rx_dropped_npkts = stats.rx_dropped;
211                 xsk->ring_stats.rx_invalid_npkts = stats.rx_invalid_descs;
212                 xsk->ring_stats.tx_invalid_npkts = stats.tx_invalid_descs;
213                 xsk->ring_stats.rx_full_npkts = stats.rx_ring_full;
214                 xsk->ring_stats.rx_fill_empty_npkts = stats.rx_fill_ring_empty_descs;
215                 xsk->ring_stats.tx_empty_npkts = stats.tx_ring_empty_descs;
216                 return 0;
217         }
218 
219         return -EINVAL;
220 }
221 
222 static void dump_app_stats(long dt)
223 {
224         int i;
225 
226         for (i = 0; i < num_socks && xsks[i]; i++) {
227                 char *fmt = "%-18s %'-14.0f %'-14lu\n";
228                 double rx_empty_polls_ps, fill_fail_polls_ps, copy_tx_sendtos_ps,
229                                 tx_wakeup_sendtos_ps, opt_polls_ps;
230 
231                 rx_empty_polls_ps = (xsks[i]->app_stats.rx_empty_polls -
232                                         xsks[i]->app_stats.prev_rx_empty_polls) * 1000000000. / dt;
233                 fill_fail_polls_ps = (xsks[i]->app_stats.fill_fail_polls -
234                                         xsks[i]->app_stats.prev_fill_fail_polls) * 1000000000. / dt;
235                 copy_tx_sendtos_ps = (xsks[i]->app_stats.copy_tx_sendtos -
236                                         xsks[i]->app_stats.prev_copy_tx_sendtos) * 1000000000. / dt;
237                 tx_wakeup_sendtos_ps = (xsks[i]->app_stats.tx_wakeup_sendtos -
238                                         xsks[i]->app_stats.prev_tx_wakeup_sendtos)
239                                                                                 * 1000000000. / dt;
240                 opt_polls_ps = (xsks[i]->app_stats.opt_polls -
241                                         xsks[i]->app_stats.prev_opt_polls) * 1000000000. / dt;
242 
243                 printf("\n%-18s %-14s %-14s\n", "", "calls/s", "count");
244                 printf(fmt, "rx empty polls", rx_empty_polls_ps, xsks[i]->app_stats.rx_empty_polls);
245                 printf(fmt, "fill fail polls", fill_fail_polls_ps,
246                                                         xsks[i]->app_stats.fill_fail_polls);
247                 printf(fmt, "copy tx sendtos", copy_tx_sendtos_ps,
248                                                         xsks[i]->app_stats.copy_tx_sendtos);
249                 printf(fmt, "tx wakeup sendtos", tx_wakeup_sendtos_ps,
250                                                         xsks[i]->app_stats.tx_wakeup_sendtos);
251                 printf(fmt, "opt polls", opt_polls_ps, xsks[i]->app_stats.opt_polls);
252 
253                 xsks[i]->app_stats.prev_rx_empty_polls = xsks[i]->app_stats.rx_empty_polls;
254                 xsks[i]->app_stats.prev_fill_fail_polls = xsks[i]->app_stats.fill_fail_polls;
255                 xsks[i]->app_stats.prev_copy_tx_sendtos = xsks[i]->app_stats.copy_tx_sendtos;
256                 xsks[i]->app_stats.prev_tx_wakeup_sendtos = xsks[i]->app_stats.tx_wakeup_sendtos;
257                 xsks[i]->app_stats.prev_opt_polls = xsks[i]->app_stats.opt_polls;
258         }
259 }
260 
261 static bool get_interrupt_number(void)
262 {
263         FILE *f_int_proc;
264         char line[4096];
265         bool found = false;
266 
267         f_int_proc = fopen("/proc/interrupts", "r");
268         if (f_int_proc == NULL) {
269                 printf("Failed to open /proc/interrupts.\n");
270                 return found;
271         }
272 
273         while (!feof(f_int_proc) && !found) {
274                 /* Make sure to read a full line at a time */
275                 if (fgets(line, sizeof(line), f_int_proc) == NULL ||
276                                 line[strlen(line) - 1] != '\n') {
277                         printf("Error reading from interrupts file\n");
278                         break;
279                 }
280 
281                 /* Extract interrupt number from line */
282                 if (strstr(line, opt_irq_str) != NULL) {
283                         irq_no = atoi(line);
284                         found = true;
285                         break;
286                 }
287         }
288 
289         fclose(f_int_proc);
290 
291         return found;
292 }
293 
294 static int get_irqs(void)
295 {
296         char count_path[PATH_MAX];
297         int total_intrs = -1;
298         FILE *f_count_proc;
299         char line[4096];
300 
301         snprintf(count_path, sizeof(count_path),
302                 "/sys/kernel/irq/%i/per_cpu_count", irq_no);
303         f_count_proc = fopen(count_path, "r");
304         if (f_count_proc == NULL) {
305                 printf("Failed to open %s\n", count_path);
306                 return total_intrs;
307         }
308 
309         if (fgets(line, sizeof(line), f_count_proc) == NULL ||
310                         line[strlen(line) - 1] != '\n') {
311                 printf("Error reading from %s\n", count_path);
312         } else {
313                 static const char com[2] = ",";
314                 char *token;
315 
316                 total_intrs = 0;
317                 token = strtok(line, com);
318                 while (token != NULL) {
319                         /* sum up interrupts across all cores */
320                         total_intrs += atoi(token);
321                         token = strtok(NULL, com);
322                 }
323         }
324 
325         fclose(f_count_proc);
326 
327         return total_intrs;
328 }
329 
330 static void dump_driver_stats(long dt)
331 {
332         int i;
333 
334         for (i = 0; i < num_socks && xsks[i]; i++) {
335                 char *fmt = "%-18s %'-14.0f %'-14lu\n";
336                 double intrs_ps;
337                 int n_ints = get_irqs();
338 
339                 if (n_ints < 0) {
340                         printf("error getting intr info for intr %i\n", irq_no);
341                         return;
342                 }
343                 xsks[i]->drv_stats.intrs = n_ints - irqs_at_init;
344 
345                 intrs_ps = (xsks[i]->drv_stats.intrs - xsks[i]->drv_stats.prev_intrs) *
346                          1000000000. / dt;
347 
348                 printf("\n%-18s %-14s %-14s\n", "", "intrs/s", "count");
349                 printf(fmt, "irqs", intrs_ps, xsks[i]->drv_stats.intrs);
350 
351                 xsks[i]->drv_stats.prev_intrs = xsks[i]->drv_stats.intrs;
352         }
353 }
354 
355 static void dump_stats(void)
356 {
357         unsigned long now = get_nsecs();
358         long dt = now - prev_time;
359         int i;
360 
361         prev_time = now;
362 
363         for (i = 0; i < num_socks && xsks[i]; i++) {
364                 char *fmt = "%-18s %'-14.0f %'-14lu\n";
365                 double rx_pps, tx_pps, dropped_pps, rx_invalid_pps, full_pps, fill_empty_pps,
366                         tx_invalid_pps, tx_empty_pps;
367 
368                 rx_pps = (xsks[i]->ring_stats.rx_npkts - xsks[i]->ring_stats.prev_rx_npkts) *
369                          1000000000. / dt;
370                 tx_pps = (xsks[i]->ring_stats.tx_npkts - xsks[i]->ring_stats.prev_tx_npkts) *
371                          1000000000. / dt;
372 
373                 printf("\n sock%d@", i);
374                 print_benchmark(false);
375                 printf("\n");
376 
377                 printf("%-18s %-14s %-14s %-14.2f\n", "", "pps", "pkts",
378                        dt / 1000000000.);
379                 printf(fmt, "rx", rx_pps, xsks[i]->ring_stats.rx_npkts);
380                 printf(fmt, "tx", tx_pps, xsks[i]->ring_stats.tx_npkts);
381 
382                 xsks[i]->ring_stats.prev_rx_npkts = xsks[i]->ring_stats.rx_npkts;
383                 xsks[i]->ring_stats.prev_tx_npkts = xsks[i]->ring_stats.tx_npkts;
384 
385                 if (opt_extra_stats) {
386                         if (!xsk_get_xdp_stats(xsk_socket__fd(xsks[i]->xsk), xsks[i])) {
387                                 dropped_pps = (xsks[i]->ring_stats.rx_dropped_npkts -
388                                                 xsks[i]->ring_stats.prev_rx_dropped_npkts) *
389                                                         1000000000. / dt;
390                                 rx_invalid_pps = (xsks[i]->ring_stats.rx_invalid_npkts -
391                                                 xsks[i]->ring_stats.prev_rx_invalid_npkts) *
392                                                         1000000000. / dt;
393                                 tx_invalid_pps = (xsks[i]->ring_stats.tx_invalid_npkts -
394                                                 xsks[i]->ring_stats.prev_tx_invalid_npkts) *
395                                                         1000000000. / dt;
396                                 full_pps = (xsks[i]->ring_stats.rx_full_npkts -
397                                                 xsks[i]->ring_stats.prev_rx_full_npkts) *
398                                                         1000000000. / dt;
399                                 fill_empty_pps = (xsks[i]->ring_stats.rx_fill_empty_npkts -
400                                                 xsks[i]->ring_stats.prev_rx_fill_empty_npkts) *
401                                                         1000000000. / dt;
402                                 tx_empty_pps = (xsks[i]->ring_stats.tx_empty_npkts -
403                                                 xsks[i]->ring_stats.prev_tx_empty_npkts) *
404                                                         1000000000. / dt;
405 
406                                 printf(fmt, "rx dropped", dropped_pps,
407                                        xsks[i]->ring_stats.rx_dropped_npkts);
408                                 printf(fmt, "rx invalid", rx_invalid_pps,
409                                        xsks[i]->ring_stats.rx_invalid_npkts);
410                                 printf(fmt, "tx invalid", tx_invalid_pps,
411                                        xsks[i]->ring_stats.tx_invalid_npkts);
412                                 printf(fmt, "rx queue full", full_pps,
413                                        xsks[i]->ring_stats.rx_full_npkts);
414                                 printf(fmt, "fill ring empty", fill_empty_pps,
415                                        xsks[i]->ring_stats.rx_fill_empty_npkts);
416                                 printf(fmt, "tx ring empty", tx_empty_pps,
417                                        xsks[i]->ring_stats.tx_empty_npkts);
418 
419                                 xsks[i]->ring_stats.prev_rx_dropped_npkts =
420                                         xsks[i]->ring_stats.rx_dropped_npkts;
421                                 xsks[i]->ring_stats.prev_rx_invalid_npkts =
422                                         xsks[i]->ring_stats.rx_invalid_npkts;
423                                 xsks[i]->ring_stats.prev_tx_invalid_npkts =
424                                         xsks[i]->ring_stats.tx_invalid_npkts;
425                                 xsks[i]->ring_stats.prev_rx_full_npkts =
426                                         xsks[i]->ring_stats.rx_full_npkts;
427                                 xsks[i]->ring_stats.prev_rx_fill_empty_npkts =
428                                         xsks[i]->ring_stats.rx_fill_empty_npkts;
429                                 xsks[i]->ring_stats.prev_tx_empty_npkts =
430                                         xsks[i]->ring_stats.tx_empty_npkts;
431                         } else {
432                                 printf("%-15s\n", "Error retrieving extra stats");
433                         }
434                 }
435         }
436 
437         if (opt_app_stats)
438                 dump_app_stats(dt);
439         if (irq_no)
440                 dump_driver_stats(dt);
441 }
442 
443 static bool is_benchmark_done(void)
444 {
445         if (opt_duration > 0) {
446                 unsigned long dt = (get_nsecs() - start_time);
447 
448                 if (dt >= opt_duration)
449                         benchmark_done = true;
450         }
451         return benchmark_done;
452 }
453 
454 static void *poller(void *arg)
455 {
456         (void)arg;
457         while (!is_benchmark_done()) {
458                 sleep(opt_interval);
459                 dump_stats();
460         }
461 
462         return NULL;
463 }
464 
465 static void remove_xdp_program(void)
466 {
467         u32 curr_prog_id = 0;
468         int cmd = CLOSE_CONN;
469 
470         if (bpf_get_link_xdp_id(opt_ifindex, &curr_prog_id, opt_xdp_flags)) {
471                 printf("bpf_get_link_xdp_id failed\n");
472                 exit(EXIT_FAILURE);
473         }
474         if (prog_id == curr_prog_id)
475                 bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
476         else if (!curr_prog_id)
477                 printf("couldn't find a prog id on a given interface\n");
478         else
479                 printf("program on interface changed, not removing\n");
480 
481         if (opt_reduced_cap) {
482                 if (write(sock, &cmd, sizeof(int)) < 0) {
483                         fprintf(stderr, "Error writing into stream socket: %s", strerror(errno));
484                         exit(EXIT_FAILURE);
485                 }
486         }
487 }
488 
489 static void int_exit(int sig)
490 {
491         benchmark_done = true;
492 }
493 
494 static void xdpsock_cleanup(void)
495 {
496         struct xsk_umem *umem = xsks[0]->umem->umem;
497         int i;
498 
499         dump_stats();
500         for (i = 0; i < num_socks; i++)
501                 xsk_socket__delete(xsks[i]->xsk);
502         (void)xsk_umem__delete(umem);
503         remove_xdp_program();
504 }
505 
506 static void __exit_with_error(int error, const char *file, const char *func,
507                               int line)
508 {
509         fprintf(stderr, "%s:%s:%i: errno: %d/\"%s\"\n", file, func,
510                 line, error, strerror(error));
511         dump_stats();
512         remove_xdp_program();
513         exit(EXIT_FAILURE);
514 }
515 
516 #define exit_with_error(error) __exit_with_error(error, __FILE__, __func__, \
517                                                  __LINE__)
518 static void swap_mac_addresses(void *data)
519 {
520         struct ether_header *eth = (struct ether_header *)data;
521         struct ether_addr *src_addr = (struct ether_addr *)&eth->ether_shost;
522         struct ether_addr *dst_addr = (struct ether_addr *)&eth->ether_dhost;
523         struct ether_addr tmp;
524 
525         tmp = *src_addr;
526         *src_addr = *dst_addr;
527         *dst_addr = tmp;
528 }
529 
530 static void hex_dump(void *pkt, size_t length, u64 addr)
531 {
532         const unsigned char *address = (unsigned char *)pkt;
533         const unsigned char *line = address;
534         size_t line_size = 32;
535         unsigned char c;
536         char buf[32];
537         int i = 0;
538 
539         if (!DEBUG_HEXDUMP)
540                 return;
541 
542         sprintf(buf, "addr=%llu", addr);
543         printf("length = %zu\n", length);
544         printf("%s | ", buf);
545         while (length-- > 0) {
546                 printf("%02X ", *address++);
547                 if (!(++i % line_size) || (length == 0 && i % line_size)) {
548                         if (length == 0) {
549                                 while (i++ % line_size)
550                                         printf("__ ");
551                         }
552                         printf(" | ");  /* right close */
553                         while (line < address) {
554                                 c = *line++;
555                                 printf("%c", (c < 33 || c == 255) ? 0x2E : c);
556                         }
557                         printf("\n");
558                         if (length > 0)
559                                 printf("%s | ", buf);
560                 }
561         }
562         printf("\n");
563 }
564 
565 static void *memset32_htonl(void *dest, u32 val, u32 size)
566 {
567         u32 *ptr = (u32 *)dest;
568         int i;
569 
570         val = htonl(val);
571 
572         for (i = 0; i < (size & (~0x3)); i += 4)
573                 ptr[i >> 2] = val;
574 
575         for (; i < size; i++)
576                 ((char *)dest)[i] = ((char *)&val)[i & 3];
577 
578         return dest;
579 }
580 
581 /*
582  * This function code has been taken from
583  * Linux kernel lib/checksum.c
584  */
585 static inline unsigned short from32to16(unsigned int x)
586 {
587         /* add up 16-bit and 16-bit for 16+c bit */
588         x = (x & 0xffff) + (x >> 16);
589         /* add up carry.. */
590         x = (x & 0xffff) + (x >> 16);
591         return x;
592 }
593 
594 /*
595  * This function code has been taken from
596  * Linux kernel lib/checksum.c
597  */
598 static unsigned int do_csum(const unsigned char *buff, int len)
599 {
600         unsigned int result = 0;
601         int odd;
602 
603         if (len <= 0)
604                 goto out;
605         odd = 1 & (unsigned long)buff;
606         if (odd) {
607 #ifdef __LITTLE_ENDIAN
608                 result += (*buff << 8);
609 #else
610                 result = *buff;
611 #endif
612                 len--;
613                 buff++;
614         }
615         if (len >= 2) {
616                 if (2 & (unsigned long)buff) {
617                         result += *(unsigned short *)buff;
618                         len -= 2;
619                         buff += 2;
620                 }
621                 if (len >= 4) {
622                         const unsigned char *end = buff +
623                                                    ((unsigned int)len & ~3);
624                         unsigned int carry = 0;
625 
626                         do {
627                                 unsigned int w = *(unsigned int *)buff;
628 
629                                 buff += 4;
630                                 result += carry;
631                                 result += w;
632                                 carry = (w > result);
633                         } while (buff < end);
634                         result += carry;
635                         result = (result & 0xffff) + (result >> 16);
636                 }
637                 if (len & 2) {
638                         result += *(unsigned short *)buff;
639                         buff += 2;
640                 }
641         }
642         if (len & 1)
643 #ifdef __LITTLE_ENDIAN
644                 result += *buff;
645 #else
646                 result += (*buff << 8);
647 #endif
648         result = from32to16(result);
649         if (odd)
650                 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
651 out:
652         return result;
653 }
654 
655 __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
656 
657 /*
658  *      This is a version of ip_compute_csum() optimized for IP headers,
659  *      which always checksum on 4 octet boundaries.
660  *      This function code has been taken from
661  *      Linux kernel lib/checksum.c
662  */
663 __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
664 {
665         return (__force __sum16)~do_csum(iph, ihl * 4);
666 }
667 
668 /*
669  * Fold a partial checksum
670  * This function code has been taken from
671  * Linux kernel include/asm-generic/checksum.h
672  */
673 static inline __sum16 csum_fold(__wsum csum)
674 {
675         u32 sum = (__force u32)csum;
676 
677         sum = (sum & 0xffff) + (sum >> 16);
678         sum = (sum & 0xffff) + (sum >> 16);
679         return (__force __sum16)~sum;
680 }
681 
682 /*
683  * This function code has been taken from
684  * Linux kernel lib/checksum.c
685  */
686 static inline u32 from64to32(u64 x)
687 {
688         /* add up 32-bit and 32-bit for 32+c bit */
689         x = (x & 0xffffffff) + (x >> 32);
690         /* add up carry.. */
691         x = (x & 0xffffffff) + (x >> 32);
692         return (u32)x;
693 }
694 
695 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
696                           __u32 len, __u8 proto, __wsum sum);
697 
698 /*
699  * This function code has been taken from
700  * Linux kernel lib/checksum.c
701  */
702 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
703                           __u32 len, __u8 proto, __wsum sum)
704 {
705         unsigned long long s = (__force u32)sum;
706 
707         s += (__force u32)saddr;
708         s += (__force u32)daddr;
709 #ifdef __BIG_ENDIAN__
710         s += proto + len;
711 #else
712         s += (proto + len) << 8;
713 #endif
714         return (__force __wsum)from64to32(s);
715 }
716 
717 /*
718  * This function has been taken from
719  * Linux kernel include/asm-generic/checksum.h
720  */
721 static inline __sum16
722 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
723                   __u8 proto, __wsum sum)
724 {
725         return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
726 }
727 
728 static inline u16 udp_csum(u32 saddr, u32 daddr, u32 len,
729                            u8 proto, u16 *udp_pkt)
730 {
731         u32 csum = 0;
732         u32 cnt = 0;
733 
734         /* udp hdr and data */
735         for (; cnt < len; cnt += 2)
736                 csum += udp_pkt[cnt >> 1];
737 
738         return csum_tcpudp_magic(saddr, daddr, len, proto, csum);
739 }
740 
741 #define ETH_FCS_SIZE 4
742 
743 #define PKT_HDR_SIZE (sizeof(struct ethhdr) + sizeof(struct iphdr) + \
744                       sizeof(struct udphdr))
745 
746 #define PKT_SIZE                (opt_pkt_size - ETH_FCS_SIZE)
747 #define IP_PKT_SIZE             (PKT_SIZE - sizeof(struct ethhdr))
748 #define UDP_PKT_SIZE            (IP_PKT_SIZE - sizeof(struct iphdr))
749 #define UDP_PKT_DATA_SIZE       (UDP_PKT_SIZE - sizeof(struct udphdr))
750 
751 static u8 pkt_data[XSK_UMEM__DEFAULT_FRAME_SIZE];
752 
753 static void gen_eth_hdr_data(void)
754 {
755         struct udphdr *udp_hdr = (struct udphdr *)(pkt_data +
756                                                    sizeof(struct ethhdr) +
757                                                    sizeof(struct iphdr));
758         struct iphdr *ip_hdr = (struct iphdr *)(pkt_data +
759                                                 sizeof(struct ethhdr));
760         struct ethhdr *eth_hdr = (struct ethhdr *)pkt_data;
761 
762         /* ethernet header */
763         memcpy(eth_hdr->h_dest, "\x3c\xfd\xfe\x9e\x7f\x71", ETH_ALEN);
764         memcpy(eth_hdr->h_source, "\xec\xb1\xd7\x98\x3a\xc0", ETH_ALEN);
765         eth_hdr->h_proto = htons(ETH_P_IP);
766 
767         /* IP header */
768         ip_hdr->version = IPVERSION;
769         ip_hdr->ihl = 0x5; /* 20 byte header */
770         ip_hdr->tos = 0x0;
771         ip_hdr->tot_len = htons(IP_PKT_SIZE);
772         ip_hdr->id = 0;
773         ip_hdr->frag_off = 0;
774         ip_hdr->ttl = IPDEFTTL;
775         ip_hdr->protocol = IPPROTO_UDP;
776         ip_hdr->saddr = htonl(0x0a0a0a10);
777         ip_hdr->daddr = htonl(0x0a0a0a20);
778 
779         /* IP header checksum */
780         ip_hdr->check = 0;
781         ip_hdr->check = ip_fast_csum((const void *)ip_hdr, ip_hdr->ihl);
782 
783         /* UDP header */
784         udp_hdr->source = htons(0x1000);
785         udp_hdr->dest = htons(0x1000);
786         udp_hdr->len = htons(UDP_PKT_SIZE);
787 
788         /* UDP data */
789         memset32_htonl(pkt_data + PKT_HDR_SIZE, opt_pkt_fill_pattern,
790                        UDP_PKT_DATA_SIZE);
791 
792         /* UDP header checksum */
793         udp_hdr->check = 0;
794         udp_hdr->check = udp_csum(ip_hdr->saddr, ip_hdr->daddr, UDP_PKT_SIZE,
795                                   IPPROTO_UDP, (u16 *)udp_hdr);
796 }
797 
798 static void gen_eth_frame(struct xsk_umem_info *umem, u64 addr)
799 {
800         memcpy(xsk_umem__get_data(umem->buffer, addr), pkt_data,
801                PKT_SIZE);
802 }
803 
804 static struct xsk_umem_info *xsk_configure_umem(void *buffer, u64 size)
805 {
806         struct xsk_umem_info *umem;
807         struct xsk_umem_config cfg = {
808                 /* We recommend that you set the fill ring size >= HW RX ring size +
809                  * AF_XDP RX ring size. Make sure you fill up the fill ring
810                  * with buffers at regular intervals, and you will with this setting
811                  * avoid allocation failures in the driver. These are usually quite
812                  * expensive since drivers have not been written to assume that
813                  * allocation failures are common. For regular sockets, kernel
814                  * allocated memory is used that only runs out in OOM situations
815                  * that should be rare.
816                  */
817                 .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS * 2,
818                 .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
819                 .frame_size = opt_xsk_frame_size,
820                 .frame_headroom = XSK_UMEM__DEFAULT_FRAME_HEADROOM,
821                 .flags = opt_umem_flags
822         };
823         int ret;
824 
825         umem = calloc(1, sizeof(*umem));
826         if (!umem)
827                 exit_with_error(errno);
828 
829         ret = xsk_umem__create(&umem->umem, buffer, size, &umem->fq, &umem->cq,
830                                &cfg);
831         if (ret)
832                 exit_with_error(-ret);
833 
834         umem->buffer = buffer;
835         return umem;
836 }
837 
838 static void xsk_populate_fill_ring(struct xsk_umem_info *umem)
839 {
840         int ret, i;
841         u32 idx;
842 
843         ret = xsk_ring_prod__reserve(&umem->fq,
844                                      XSK_RING_PROD__DEFAULT_NUM_DESCS * 2, &idx);
845         if (ret != XSK_RING_PROD__DEFAULT_NUM_DESCS * 2)
846                 exit_with_error(-ret);
847         for (i = 0; i < XSK_RING_PROD__DEFAULT_NUM_DESCS * 2; i++)
848                 *xsk_ring_prod__fill_addr(&umem->fq, idx++) =
849                         i * opt_xsk_frame_size;
850         xsk_ring_prod__submit(&umem->fq, XSK_RING_PROD__DEFAULT_NUM_DESCS * 2);
851 }
852 
853 static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem,
854                                                     bool rx, bool tx)
855 {
856         struct xsk_socket_config cfg;
857         struct xsk_socket_info *xsk;
858         struct xsk_ring_cons *rxr;
859         struct xsk_ring_prod *txr;
860         int ret;
861 
862         xsk = calloc(1, sizeof(*xsk));
863         if (!xsk)
864                 exit_with_error(errno);
865 
866         xsk->umem = umem;
867         cfg.rx_size = XSK_RING_CONS__DEFAULT_NUM_DESCS;
868         cfg.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS;
869         if (opt_num_xsks > 1 || opt_reduced_cap)
870                 cfg.libbpf_flags = XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD;
871         else
872                 cfg.libbpf_flags = 0;
873         cfg.xdp_flags = opt_xdp_flags;
874         cfg.bind_flags = opt_xdp_bind_flags;
875 
876         rxr = rx ? &xsk->rx : NULL;
877         txr = tx ? &xsk->tx : NULL;
878         ret = xsk_socket__create(&xsk->xsk, opt_if, opt_queue, umem->umem,
879                                  rxr, txr, &cfg);
880         if (ret)
881                 exit_with_error(-ret);
882 
883         ret = bpf_get_link_xdp_id(opt_ifindex, &prog_id, opt_xdp_flags);
884         if (ret)
885                 exit_with_error(-ret);
886 
887         xsk->app_stats.rx_empty_polls = 0;
888         xsk->app_stats.fill_fail_polls = 0;
889         xsk->app_stats.copy_tx_sendtos = 0;
890         xsk->app_stats.tx_wakeup_sendtos = 0;
891         xsk->app_stats.opt_polls = 0;
892         xsk->app_stats.prev_rx_empty_polls = 0;
893         xsk->app_stats.prev_fill_fail_polls = 0;
894         xsk->app_stats.prev_copy_tx_sendtos = 0;
895         xsk->app_stats.prev_tx_wakeup_sendtos = 0;
896         xsk->app_stats.prev_opt_polls = 0;
897 
898         return xsk;
899 }
900 
901 static struct option long_options[] = {
902         {"rxdrop", no_argument, 0, 'r'},
903         {"txonly", no_argument, 0, 't'},
904         {"l2fwd", no_argument, 0, 'l'},
905         {"interface", required_argument, 0, 'i'},
906         {"queue", required_argument, 0, 'q'},
907         {"poll", no_argument, 0, 'p'},
908         {"xdp-skb", no_argument, 0, 'S'},
909         {"xdp-native", no_argument, 0, 'N'},
910         {"interval", required_argument, 0, 'n'},
911         {"zero-copy", no_argument, 0, 'z'},
912         {"copy", no_argument, 0, 'c'},
913         {"frame-size", required_argument, 0, 'f'},
914         {"no-need-wakeup", no_argument, 0, 'm'},
915         {"unaligned", no_argument, 0, 'u'},
916         {"shared-umem", no_argument, 0, 'M'},
917         {"force", no_argument, 0, 'F'},
918         {"duration", required_argument, 0, 'd'},
919         {"batch-size", required_argument, 0, 'b'},
920         {"tx-pkt-count", required_argument, 0, 'C'},
921         {"tx-pkt-size", required_argument, 0, 's'},
922         {"tx-pkt-pattern", required_argument, 0, 'P'},
923         {"extra-stats", no_argument, 0, 'x'},
924         {"quiet", no_argument, 0, 'Q'},
925         {"app-stats", no_argument, 0, 'a'},
926         {"irq-string", no_argument, 0, 'I'},
927         {"busy-poll", no_argument, 0, 'B'},
928         {"reduce-cap", no_argument, 0, 'R'},
929         {0, 0, 0, 0}
930 };
931 
932 static void usage(const char *prog)
933 {
934         const char *str =
935                 "  Usage: %s [OPTIONS]\n"
936                 "  Options:\n"
937                 "  -r, --rxdrop         Discard all incoming packets (default)\n"
938                 "  -t, --txonly         Only send packets\n"
939                 "  -l, --l2fwd          MAC swap L2 forwarding\n"
940                 "  -i, --interface=n    Run on interface n\n"
941                 "  -q, --queue=n        Use queue n (default 0)\n"
942                 "  -p, --poll           Use poll syscall\n"
943                 "  -S, --xdp-skb=n      Use XDP skb-mod\n"
944                 "  -N, --xdp-native=n   Enforce XDP native mode\n"
945                 "  -n, --interval=n     Specify statistics update interval (default 1 sec).\n"
946                 "  -z, --zero-copy      Force zero-copy mode.\n"
947                 "  -c, --copy           Force copy mode.\n"
948                 "  -m, --no-need-wakeup Turn off use of driver need wakeup flag.\n"
949                 "  -f, --frame-size=n   Set the frame size (must be a power of two in aligned mode, default is %d).\n"
950                 "  -u, --unaligned      Enable unaligned chunk placement\n"
951                 "  -M, --shared-umem    Enable XDP_SHARED_UMEM (cannot be used with -R)\n"
952                 "  -F, --force          Force loading the XDP prog\n"
953                 "  -d, --duration=n     Duration in secs to run command.\n"
954                 "                       Default: forever.\n"
955                 "  -b, --batch-size=n   Batch size for sending or receiving\n"
956                 "                       packets. Default: %d\n"
957                 "  -C, --tx-pkt-count=n Number of packets to send.\n"
958                 "                       Default: Continuous packets.\n"
959                 "  -s, --tx-pkt-size=n  Transmit packet size.\n"
960                 "                       (Default: %d bytes)\n"
961                 "                       Min size: %d, Max size %d.\n"
962                 "  -P, --tx-pkt-pattern=nPacket fill pattern. Default: 0x%x\n"
963                 "  -x, --extra-stats    Display extra statistics.\n"
964                 "  -Q, --quiet          Do not display any stats.\n"
965                 "  -a, --app-stats      Display application (syscall) statistics.\n"
966                 "  -I, --irq-string     Display driver interrupt statistics for interface associated with irq-string.\n"
967                 "  -B, --busy-poll      Busy poll.\n"
968                 "  -R, --reduce-cap     Use reduced capabilities (cannot be used with -M)\n"
969                 "\n";
970         fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE,
971                 opt_batch_size, MIN_PKT_SIZE, MIN_PKT_SIZE,
972                 XSK_UMEM__DEFAULT_FRAME_SIZE, opt_pkt_fill_pattern);
973 
974         exit(EXIT_FAILURE);
975 }
976 
977 static void parse_command_line(int argc, char **argv)
978 {
979         int option_index, c;
980 
981         opterr = 0;
982 
983         for (;;) {
984                 c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQaI:BR",
985                                 long_options, &option_index);
986                 if (c == -1)
987                         break;
988 
989                 switch (c) {
990                 case 'r':
991                         opt_bench = BENCH_RXDROP;
992                         break;
993                 case 't':
994                         opt_bench = BENCH_TXONLY;
995                         break;
996                 case 'l':
997                         opt_bench = BENCH_L2FWD;
998                         break;
999                 case 'i':
1000                         opt_if = optarg;
1001                         break;
1002                 case 'q':
1003                         opt_queue = atoi(optarg);
1004                         break;
1005                 case 'p':
1006                         opt_poll = 1;
1007                         break;
1008                 case 'S':
1009                         opt_xdp_flags |= XDP_FLAGS_SKB_MODE;
1010                         opt_xdp_bind_flags |= XDP_COPY;
1011                         break;
1012                 case 'N':
1013                         /* default, set below */
1014                         break;
1015                 case 'n':
1016                         opt_interval = atoi(optarg);
1017                         break;
1018                 case 'z':
1019                         opt_xdp_bind_flags |= XDP_ZEROCOPY;
1020                         break;
1021                 case 'c':
1022                         opt_xdp_bind_flags |= XDP_COPY;
1023                         break;
1024                 case 'u':
1025                         opt_umem_flags |= XDP_UMEM_UNALIGNED_CHUNK_FLAG;
1026                         opt_unaligned_chunks = 1;
1027                         opt_mmap_flags = MAP_HUGETLB;
1028                         break;
1029                 case 'F':
1030                         opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
1031                         break;
1032                 case 'f':
1033                         opt_xsk_frame_size = atoi(optarg);
1034                         break;
1035                 case 'm':
1036                         opt_need_wakeup = false;
1037                         opt_xdp_bind_flags &= ~XDP_USE_NEED_WAKEUP;
1038                         break;
1039                 case 'M':
1040                         opt_num_xsks = MAX_SOCKS;
1041                         break;
1042                 case 'd':
1043                         opt_duration = atoi(optarg);
1044                         opt_duration *= 1000000000;
1045                         break;
1046                 case 'b':
1047                         opt_batch_size = atoi(optarg);
1048                         break;
1049                 case 'C':
1050                         opt_pkt_count = atoi(optarg);
1051                         break;
1052                 case 's':
1053                         opt_pkt_size = atoi(optarg);
1054                         if (opt_pkt_size > (XSK_UMEM__DEFAULT_FRAME_SIZE) ||
1055                             opt_pkt_size < MIN_PKT_SIZE) {
1056                                 fprintf(stderr,
1057                                         "ERROR: Invalid frame size %d\n",
1058                                         opt_pkt_size);
1059                                 usage(basename(argv[0]));
1060                         }
1061                         break;
1062                 case 'P':
1063                         opt_pkt_fill_pattern = strtol(optarg, NULL, 16);
1064                         break;
1065                 case 'x':
1066                         opt_extra_stats = 1;
1067                         break;
1068                 case 'Q':
1069                         opt_quiet = 1;
1070                         break;
1071                 case 'a':
1072                         opt_app_stats = 1;
1073                         break;
1074                 case 'I':
1075                         opt_irq_str = optarg;
1076                         if (get_interrupt_number())
1077                                 irqs_at_init = get_irqs();
1078                         if (irqs_at_init < 0) {
1079                                 fprintf(stderr, "ERROR: Failed to get irqs for %s\n", opt_irq_str);
1080                                 usage(basename(argv[0]));
1081                         }
1082                         break;
1083                 case 'B':
1084                         opt_busy_poll = 1;
1085                         break;
1086                 case 'R':
1087                         opt_reduced_cap = true;
1088                         break;
1089                 default:
1090                         usage(basename(argv[0]));
1091                 }
1092         }
1093 
1094         if (!(opt_xdp_flags & XDP_FLAGS_SKB_MODE))
1095                 opt_xdp_flags |= XDP_FLAGS_DRV_MODE;
1096 
1097         opt_ifindex = if_nametoindex(opt_if);
1098         if (!opt_ifindex) {
1099                 fprintf(stderr, "ERROR: interface \"%s\" does not exist\n",
1100                         opt_if);
1101                 usage(basename(argv[0]));
1102         }
1103 
1104         if ((opt_xsk_frame_size & (opt_xsk_frame_size - 1)) &&
1105             !opt_unaligned_chunks) {
1106                 fprintf(stderr, "--frame-size=%d is not a power of two\n",
1107                         opt_xsk_frame_size);
1108                 usage(basename(argv[0]));
1109         }
1110 
1111         if (opt_reduced_cap && opt_num_xsks > 1) {
1112                 fprintf(stderr, "ERROR: -M and -R cannot be used together\n");
1113                 usage(basename(argv[0]));
1114         }
1115 }
1116 
1117 static void kick_tx(struct xsk_socket_info *xsk)
1118 {
1119         int ret;
1120 
1121         ret = sendto(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, 0);
1122         if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN ||
1123             errno == EBUSY || errno == ENETDOWN)
1124                 return;
1125         exit_with_error(errno);
1126 }
1127 
1128 static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
1129 {
1130         struct xsk_umem_info *umem = xsk->umem;
1131         u32 idx_cq = 0, idx_fq = 0;
1132         unsigned int rcvd;
1133         size_t ndescs;
1134 
1135         if (!xsk->outstanding_tx)
1136                 return;
1137 
1138         /* In copy mode, Tx is driven by a syscall so we need to use e.g. sendto() to
1139          * really send the packets. In zero-copy mode we do not have to do this, since Tx
1140          * is driven by the NAPI loop. So as an optimization, we do not have to call
1141          * sendto() all the time in zero-copy mode for l2fwd.
1142          */
1143         if (opt_xdp_bind_flags & XDP_COPY) {
1144                 xsk->app_stats.copy_tx_sendtos++;
1145                 kick_tx(xsk);
1146         }
1147 
1148         ndescs = (xsk->outstanding_tx > opt_batch_size) ? opt_batch_size :
1149                 xsk->outstanding_tx;
1150 
1151         /* re-add completed Tx buffers */
1152         rcvd = xsk_ring_cons__peek(&umem->cq, ndescs, &idx_cq);
1153         if (rcvd > 0) {
1154                 unsigned int i;
1155                 int ret;
1156 
1157                 ret = xsk_ring_prod__reserve(&umem->fq, rcvd, &idx_fq);
1158                 while (ret != rcvd) {
1159                         if (ret < 0)
1160                                 exit_with_error(-ret);
1161                         if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&umem->fq)) {
1162                                 xsk->app_stats.fill_fail_polls++;
1163                                 recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL,
1164                                          NULL);
1165                         }
1166                         ret = xsk_ring_prod__reserve(&umem->fq, rcvd, &idx_fq);
1167                 }
1168 
1169                 for (i = 0; i < rcvd; i++)
1170                         *xsk_ring_prod__fill_addr(&umem->fq, idx_fq++) =
1171                                 *xsk_ring_cons__comp_addr(&umem->cq, idx_cq++);
1172 
1173                 xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
1174                 xsk_ring_cons__release(&xsk->umem->cq, rcvd);
1175                 xsk->outstanding_tx -= rcvd;
1176         }
1177 }
1178 
1179 static inline void complete_tx_only(struct xsk_socket_info *xsk,
1180                                     int batch_size)
1181 {
1182         unsigned int rcvd;
1183         u32 idx;
1184 
1185         if (!xsk->outstanding_tx)
1186                 return;
1187 
1188         if (!opt_need_wakeup || xsk_ring_prod__needs_wakeup(&xsk->tx)) {
1189                 xsk->app_stats.tx_wakeup_sendtos++;
1190                 kick_tx(xsk);
1191         }
1192 
1193         rcvd = xsk_ring_cons__peek(&xsk->umem->cq, batch_size, &idx);
1194         if (rcvd > 0) {
1195                 xsk_ring_cons__release(&xsk->umem->cq, rcvd);
1196                 xsk->outstanding_tx -= rcvd;
1197         }
1198 }
1199 
1200 static void rx_drop(struct xsk_socket_info *xsk)
1201 {
1202         unsigned int rcvd, i;
1203         u32 idx_rx = 0, idx_fq = 0;
1204         int ret;
1205 
1206         rcvd = xsk_ring_cons__peek(&xsk->rx, opt_batch_size, &idx_rx);
1207         if (!rcvd) {
1208                 if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
1209                         xsk->app_stats.rx_empty_polls++;
1210                         recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL);
1211                 }
1212                 return;
1213         }
1214 
1215         ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
1216         while (ret != rcvd) {
1217                 if (ret < 0)
1218                         exit_with_error(-ret);
1219                 if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
1220                         xsk->app_stats.fill_fail_polls++;
1221                         recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL);
1222                 }
1223                 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
1224         }
1225 
1226         for (i = 0; i < rcvd; i++) {
1227                 u64 addr = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx)->addr;
1228                 u32 len = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx++)->len;
1229                 u64 orig = xsk_umem__extract_addr(addr);
1230 
1231                 addr = xsk_umem__add_offset_to_addr(addr);
1232                 char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
1233 
1234                 hex_dump(pkt, len, addr);
1235                 *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) = orig;
1236         }
1237 
1238         xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
1239         xsk_ring_cons__release(&xsk->rx, rcvd);
1240         xsk->ring_stats.rx_npkts += rcvd;
1241 }
1242 
1243 static void rx_drop_all(void)
1244 {
1245         struct pollfd fds[MAX_SOCKS] = {};
1246         int i, ret;
1247 
1248         for (i = 0; i < num_socks; i++) {
1249                 fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
1250                 fds[i].events = POLLIN;
1251         }
1252 
1253         for (;;) {
1254                 if (opt_poll) {
1255                         for (i = 0; i < num_socks; i++)
1256                                 xsks[i]->app_stats.opt_polls++;
1257                         ret = poll(fds, num_socks, opt_timeout);
1258                         if (ret <= 0)
1259                                 continue;
1260                 }
1261 
1262                 for (i = 0; i < num_socks; i++)
1263                         rx_drop(xsks[i]);
1264 
1265                 if (benchmark_done)
1266                         break;
1267         }
1268 }
1269 
1270 static void tx_only(struct xsk_socket_info *xsk, u32 *frame_nb, int batch_size)
1271 {
1272         u32 idx;
1273         unsigned int i;
1274 
1275         while (xsk_ring_prod__reserve(&xsk->tx, batch_size, &idx) <
1276                                       batch_size) {
1277                 complete_tx_only(xsk, batch_size);
1278                 if (benchmark_done)
1279                         return;
1280         }
1281 
1282         for (i = 0; i < batch_size; i++) {
1283                 struct xdp_desc *tx_desc = xsk_ring_prod__tx_desc(&xsk->tx,
1284                                                                   idx + i);
1285                 tx_desc->addr = (*frame_nb + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT;
1286                 tx_desc->len = PKT_SIZE;
1287         }
1288 
1289         xsk_ring_prod__submit(&xsk->tx, batch_size);
1290         xsk->ring_stats.tx_npkts += batch_size;
1291         xsk->outstanding_tx += batch_size;
1292         *frame_nb += batch_size;
1293         *frame_nb %= NUM_FRAMES;
1294         complete_tx_only(xsk, batch_size);
1295 }
1296 
1297 static inline int get_batch_size(int pkt_cnt)
1298 {
1299         if (!opt_pkt_count)
1300                 return opt_batch_size;
1301 
1302         if (pkt_cnt + opt_batch_size <= opt_pkt_count)
1303                 return opt_batch_size;
1304 
1305         return opt_pkt_count - pkt_cnt;
1306 }
1307 
1308 static void complete_tx_only_all(void)
1309 {
1310         bool pending;
1311         int i;
1312 
1313         do {
1314                 pending = false;
1315                 for (i = 0; i < num_socks; i++) {
1316                         if (xsks[i]->outstanding_tx) {
1317                                 complete_tx_only(xsks[i], opt_batch_size);
1318                                 pending = !!xsks[i]->outstanding_tx;
1319                         }
1320                 }
1321         } while (pending);
1322 }
1323 
1324 static void tx_only_all(void)
1325 {
1326         struct pollfd fds[MAX_SOCKS] = {};
1327         u32 frame_nb[MAX_SOCKS] = {};
1328         int pkt_cnt = 0;
1329         int i, ret;
1330 
1331         for (i = 0; i < num_socks; i++) {
1332                 fds[0].fd = xsk_socket__fd(xsks[i]->xsk);
1333                 fds[0].events = POLLOUT;
1334         }
1335 
1336         while ((opt_pkt_count && pkt_cnt < opt_pkt_count) || !opt_pkt_count) {
1337                 int batch_size = get_batch_size(pkt_cnt);
1338 
1339                 if (opt_poll) {
1340                         for (i = 0; i < num_socks; i++)
1341                                 xsks[i]->app_stats.opt_polls++;
1342                         ret = poll(fds, num_socks, opt_timeout);
1343                         if (ret <= 0)
1344                                 continue;
1345 
1346                         if (!(fds[0].revents & POLLOUT))
1347                                 continue;
1348                 }
1349 
1350                 for (i = 0; i < num_socks; i++)
1351                         tx_only(xsks[i], &frame_nb[i], batch_size);
1352 
1353                 pkt_cnt += batch_size;
1354 
1355                 if (benchmark_done)
1356                         break;
1357         }
1358 
1359         if (opt_pkt_count)
1360                 complete_tx_only_all();
1361 }
1362 
1363 static void l2fwd(struct xsk_socket_info *xsk)
1364 {
1365         unsigned int rcvd, i;
1366         u32 idx_rx = 0, idx_tx = 0;
1367         int ret;
1368 
1369         complete_tx_l2fwd(xsk);
1370 
1371         rcvd = xsk_ring_cons__peek(&xsk->rx, opt_batch_size, &idx_rx);
1372         if (!rcvd) {
1373                 if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
1374                         xsk->app_stats.rx_empty_polls++;
1375                         recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL);
1376                 }
1377                 return;
1378         }
1379         xsk->ring_stats.rx_npkts += rcvd;
1380 
1381         ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
1382         while (ret != rcvd) {
1383                 if (ret < 0)
1384                         exit_with_error(-ret);
1385                 complete_tx_l2fwd(xsk);
1386                 if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->tx)) {
1387                         xsk->app_stats.tx_wakeup_sendtos++;
1388                         kick_tx(xsk);
1389                 }
1390                 ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
1391         }
1392 
1393         for (i = 0; i < rcvd; i++) {
1394                 u64 addr = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx)->addr;
1395                 u32 len = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx++)->len;
1396                 u64 orig = addr;
1397 
1398                 addr = xsk_umem__add_offset_to_addr(addr);
1399                 char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
1400 
1401                 swap_mac_addresses(pkt);
1402 
1403                 hex_dump(pkt, len, addr);
1404                 xsk_ring_prod__tx_desc(&xsk->tx, idx_tx)->addr = orig;
1405                 xsk_ring_prod__tx_desc(&xsk->tx, idx_tx++)->len = len;
1406         }
1407 
1408         xsk_ring_prod__submit(&xsk->tx, rcvd);
1409         xsk_ring_cons__release(&xsk->rx, rcvd);
1410 
1411         xsk->ring_stats.tx_npkts += rcvd;
1412         xsk->outstanding_tx += rcvd;
1413 }
1414 
1415 static void l2fwd_all(void)
1416 {
1417         struct pollfd fds[MAX_SOCKS] = {};
1418         int i, ret;
1419 
1420         for (;;) {
1421                 if (opt_poll) {
1422                         for (i = 0; i < num_socks; i++) {
1423                                 fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
1424                                 fds[i].events = POLLOUT | POLLIN;
1425                                 xsks[i]->app_stats.opt_polls++;
1426                         }
1427                         ret = poll(fds, num_socks, opt_timeout);
1428                         if (ret <= 0)
1429                                 continue;
1430                 }
1431 
1432                 for (i = 0; i < num_socks; i++)
1433                         l2fwd(xsks[i]);
1434 
1435                 if (benchmark_done)
1436                         break;
1437         }
1438 }
1439 
1440 static void load_xdp_program(char **argv, struct bpf_object **obj)
1441 {
1442         struct bpf_prog_load_attr prog_load_attr = {
1443                 .prog_type      = BPF_PROG_TYPE_XDP,
1444         };
1445         char xdp_filename[256];
1446         int prog_fd;
1447 
1448         snprintf(xdp_filename, sizeof(xdp_filename), "%s_kern.o", argv[0]);
1449         prog_load_attr.file = xdp_filename;
1450 
1451         if (bpf_prog_load_xattr(&prog_load_attr, obj, &prog_fd))
1452                 exit(EXIT_FAILURE);
1453         if (prog_fd < 0) {
1454                 fprintf(stderr, "ERROR: no program found: %s\n",
1455                         strerror(prog_fd));
1456                 exit(EXIT_FAILURE);
1457         }
1458 
1459         if (bpf_set_link_xdp_fd(opt_ifindex, prog_fd, opt_xdp_flags) < 0) {
1460                 fprintf(stderr, "ERROR: link set xdp fd failed\n");
1461                 exit(EXIT_FAILURE);
1462         }
1463 }
1464 
1465 static void enter_xsks_into_map(struct bpf_object *obj)
1466 {
1467         struct bpf_map *map;
1468         int i, xsks_map;
1469 
1470         map = bpf_object__find_map_by_name(obj, "xsks_map");
1471         xsks_map = bpf_map__fd(map);
1472         if (xsks_map < 0) {
1473                 fprintf(stderr, "ERROR: no xsks map found: %s\n",
1474                         strerror(xsks_map));
1475                         exit(EXIT_FAILURE);
1476         }
1477 
1478         for (i = 0; i < num_socks; i++) {
1479                 int fd = xsk_socket__fd(xsks[i]->xsk);
1480                 int key, ret;
1481 
1482                 key = i;
1483                 ret = bpf_map_update_elem(xsks_map, &key, &fd, 0);
1484                 if (ret) {
1485                         fprintf(stderr, "ERROR: bpf_map_update_elem %d\n", i);
1486                         exit(EXIT_FAILURE);
1487                 }
1488         }
1489 }
1490 
1491 static void apply_setsockopt(struct xsk_socket_info *xsk)
1492 {
1493         int sock_opt;
1494 
1495         if (!opt_busy_poll)
1496                 return;
1497 
1498         sock_opt = 1;
1499         if (setsockopt(xsk_socket__fd(xsk->xsk), SOL_SOCKET, SO_PREFER_BUSY_POLL,
1500                        (void *)&sock_opt, sizeof(sock_opt)) < 0)
1501                 exit_with_error(errno);
1502 
1503         sock_opt = 20;
1504         if (setsockopt(xsk_socket__fd(xsk->xsk), SOL_SOCKET, SO_BUSY_POLL,
1505                        (void *)&sock_opt, sizeof(sock_opt)) < 0)
1506                 exit_with_error(errno);
1507 
1508         sock_opt = opt_batch_size;
1509         if (setsockopt(xsk_socket__fd(xsk->xsk), SOL_SOCKET, SO_BUSY_POLL_BUDGET,
1510                        (void *)&sock_opt, sizeof(sock_opt)) < 0)
1511                 exit_with_error(errno);
1512 }
1513 
1514 static int recv_xsks_map_fd_from_ctrl_node(int sock, int *_fd)
1515 {
1516         char cms[CMSG_SPACE(sizeof(int))];
1517         struct cmsghdr *cmsg;
1518         struct msghdr msg;
1519         struct iovec iov;
1520         int value;
1521         int len;
1522 
1523         iov.iov_base = &value;
1524         iov.iov_len = sizeof(int);
1525 
1526         msg.msg_name = 0;
1527         msg.msg_namelen = 0;
1528         msg.msg_iov = &iov;
1529         msg.msg_iovlen = 1;
1530         msg.msg_flags = 0;
1531         msg.msg_control = (caddr_t)cms;
1532         msg.msg_controllen = sizeof(cms);
1533 
1534         len = recvmsg(sock, &msg, 0);
1535 
1536         if (len < 0) {
1537                 fprintf(stderr, "Recvmsg failed length incorrect.\n");
1538                 return -EINVAL;
1539         }
1540 
1541         if (len == 0) {
1542                 fprintf(stderr, "Recvmsg failed no data\n");
1543                 return -EINVAL;
1544         }
1545 
1546         cmsg = CMSG_FIRSTHDR(&msg);
1547         *_fd = *(int *)CMSG_DATA(cmsg);
1548 
1549         return 0;
1550 }
1551 
1552 static int
1553 recv_xsks_map_fd(int *xsks_map_fd)
1554 {
1555         struct sockaddr_un server;
1556         int err;
1557 
1558         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1559         if (sock < 0) {
1560                 fprintf(stderr, "Error opening socket stream: %s", strerror(errno));
1561                 return errno;
1562         }
1563 
1564         server.sun_family = AF_UNIX;
1565         strcpy(server.sun_path, SOCKET_NAME);
1566 
1567         if (connect(sock, (struct sockaddr *)&server, sizeof(struct sockaddr_un)) < 0) {
1568                 close(sock);
1569                 fprintf(stderr, "Error connecting stream socket: %s", strerror(errno));
1570                 return errno;
1571         }
1572 
1573         err = recv_xsks_map_fd_from_ctrl_node(sock, xsks_map_fd);
1574         if (err) {
1575                 fprintf(stderr, "Error %d receiving fd\n", err);
1576                 return err;
1577         }
1578         return 0;
1579 }
1580 
1581 int main(int argc, char **argv)
1582 {
1583         struct __user_cap_header_struct hdr = { _LINUX_CAPABILITY_VERSION_3, 0 };
1584         struct __user_cap_data_struct data[2] = { { 0 } };
1585         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
1586         bool rx = false, tx = false;
1587         struct xsk_umem_info *umem;
1588         struct bpf_object *obj;
1589         int xsks_map_fd = 0;
1590         pthread_t pt;
1591         int i, ret;
1592         void *bufs;
1593 
1594         parse_command_line(argc, argv);
1595 
1596         if (opt_reduced_cap) {
1597                 if (capget(&hdr, data)  < 0)
1598                         fprintf(stderr, "Error getting capabilities\n");
1599 
1600                 data->effective &= CAP_TO_MASK(CAP_NET_RAW);
1601                 data->permitted &= CAP_TO_MASK(CAP_NET_RAW);
1602 
1603                 if (capset(&hdr, data) < 0)
1604                         fprintf(stderr, "Setting capabilities failed\n");
1605 
1606                 if (capget(&hdr, data)  < 0) {
1607                         fprintf(stderr, "Error getting capabilities\n");
1608                 } else {
1609                         fprintf(stderr, "Capabilities EFF %x Caps INH %x Caps Per %x\n",
1610                                 data[0].effective, data[0].inheritable, data[0].permitted);
1611                         fprintf(stderr, "Capabilities EFF %x Caps INH %x Caps Per %x\n",
1612                                 data[1].effective, data[1].inheritable, data[1].permitted);
1613                 }
1614         } else {
1615                 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
1616                         fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n",
1617                                 strerror(errno));
1618                         exit(EXIT_FAILURE);
1619                 }
1620 
1621                 if (opt_num_xsks > 1)
1622                         load_xdp_program(argv, &obj);
1623         }
1624 
1625         /* Reserve memory for the umem. Use hugepages if unaligned chunk mode */
1626         bufs = mmap(NULL, NUM_FRAMES * opt_xsk_frame_size,
1627                     PROT_READ | PROT_WRITE,
1628                     MAP_PRIVATE | MAP_ANONYMOUS | opt_mmap_flags, -1, 0);
1629         if (bufs == MAP_FAILED) {
1630                 printf("ERROR: mmap failed\n");
1631                 exit(EXIT_FAILURE);
1632         }
1633 
1634         /* Create sockets... */
1635         umem = xsk_configure_umem(bufs, NUM_FRAMES * opt_xsk_frame_size);
1636         if (opt_bench == BENCH_RXDROP || opt_bench == BENCH_L2FWD) {
1637                 rx = true;
1638                 xsk_populate_fill_ring(umem);
1639         }
1640         if (opt_bench == BENCH_L2FWD || opt_bench == BENCH_TXONLY)
1641                 tx = true;
1642         for (i = 0; i < opt_num_xsks; i++)
1643                 xsks[num_socks++] = xsk_configure_socket(umem, rx, tx);
1644 
1645         for (i = 0; i < opt_num_xsks; i++)
1646                 apply_setsockopt(xsks[i]);
1647 
1648         if (opt_bench == BENCH_TXONLY) {
1649                 gen_eth_hdr_data();
1650 
1651                 for (i = 0; i < NUM_FRAMES; i++)
1652                         gen_eth_frame(umem, i * opt_xsk_frame_size);
1653         }
1654 
1655         if (opt_num_xsks > 1 && opt_bench != BENCH_TXONLY)
1656                 enter_xsks_into_map(obj);
1657 
1658         if (opt_reduced_cap) {
1659                 ret = recv_xsks_map_fd(&xsks_map_fd);
1660                 if (ret) {
1661                         fprintf(stderr, "Error %d receiving xsks_map_fd\n", ret);
1662                         exit_with_error(ret);
1663                 }
1664                 if (xsks[0]->xsk) {
1665                         ret = xsk_socket__update_xskmap(xsks[0]->xsk, xsks_map_fd);
1666                         if (ret) {
1667                                 fprintf(stderr, "Update of BPF map failed(%d)\n", ret);
1668                                 exit_with_error(ret);
1669                         }
1670                 }
1671         }
1672 
1673         signal(SIGINT, int_exit);
1674         signal(SIGTERM, int_exit);
1675         signal(SIGABRT, int_exit);
1676 
1677         setlocale(LC_ALL, "");
1678 
1679         if (!opt_quiet) {
1680                 ret = pthread_create(&pt, NULL, poller, NULL);
1681                 if (ret)
1682                         exit_with_error(ret);
1683         }
1684 
1685         prev_time = get_nsecs();
1686         start_time = prev_time;
1687 
1688         if (opt_bench == BENCH_RXDROP)
1689                 rx_drop_all();
1690         else if (opt_bench == BENCH_TXONLY)
1691                 tx_only_all();
1692         else
1693                 l2fwd_all();
1694 
1695         benchmark_done = true;
1696 
1697         if (!opt_quiet)
1698                 pthread_join(pt, NULL);
1699 
1700         xdpsock_cleanup();
1701 
1702         munmap(bufs, NUM_FRAMES * opt_xsk_frame_size);
1703 
1704         return 0;
1705 }
1706 

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