1c8acb68b977cd04bda4096fdde12344b1a3c54a
[platform/kernel/linux-rpi.git] / tools / testing / selftests / bpf / xdp_hw_metadata.c
1 // SPDX-License-Identifier: GPL-2.0
2
3 /* Reference program for verifying XDP metadata on real HW. Functional test
4  * only, doesn't test the performance.
5  *
6  * RX:
7  * - UDP 9091 packets are diverted into AF_XDP
8  * - Metadata verified:
9  *   - rx_timestamp
10  *   - rx_hash
11  *
12  * TX:
13  * - TBD
14  */
15
16 #include <test_progs.h>
17 #include <network_helpers.h>
18 #include "xdp_hw_metadata.skel.h"
19 #include "xsk.h"
20
21 #include <error.h>
22 #include <linux/errqueue.h>
23 #include <linux/if_link.h>
24 #include <linux/net_tstamp.h>
25 #include <linux/udp.h>
26 #include <linux/sockios.h>
27 #include <sys/mman.h>
28 #include <net/if.h>
29 #include <poll.h>
30
31 #include "xdp_metadata.h"
32
33 #define UMEM_NUM 16
34 #define UMEM_FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE
35 #define UMEM_SIZE (UMEM_FRAME_SIZE * UMEM_NUM)
36 #define XDP_FLAGS (XDP_FLAGS_DRV_MODE | XDP_FLAGS_REPLACE)
37
38 struct xsk {
39         void *umem_area;
40         struct xsk_umem *umem;
41         struct xsk_ring_prod fill;
42         struct xsk_ring_cons comp;
43         struct xsk_ring_prod tx;
44         struct xsk_ring_cons rx;
45         struct xsk_socket *socket;
46 };
47
48 struct xdp_hw_metadata *bpf_obj;
49 struct xsk *rx_xsk;
50 const char *ifname;
51 int ifindex;
52 int rxq;
53
54 void test__fail(void) { /* for network_helpers.c */ }
55
56 static int open_xsk(int ifindex, struct xsk *xsk, __u32 queue_id)
57 {
58         int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
59         const struct xsk_socket_config socket_config = {
60                 .rx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
61                 .tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
62                 .bind_flags = XDP_COPY,
63         };
64         const struct xsk_umem_config umem_config = {
65                 .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
66                 .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
67                 .frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
68                 .flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG,
69         };
70         __u32 idx;
71         u64 addr;
72         int ret;
73         int i;
74
75         xsk->umem_area = mmap(NULL, UMEM_SIZE, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
76         if (xsk->umem_area == MAP_FAILED)
77                 return -ENOMEM;
78
79         ret = xsk_umem__create(&xsk->umem,
80                                xsk->umem_area, UMEM_SIZE,
81                                &xsk->fill,
82                                &xsk->comp,
83                                &umem_config);
84         if (ret)
85                 return ret;
86
87         ret = xsk_socket__create(&xsk->socket, ifindex, queue_id,
88                                  xsk->umem,
89                                  &xsk->rx,
90                                  &xsk->tx,
91                                  &socket_config);
92         if (ret)
93                 return ret;
94
95         /* First half of umem is for TX. This way address matches 1-to-1
96          * to the completion queue index.
97          */
98
99         for (i = 0; i < UMEM_NUM / 2; i++) {
100                 addr = i * UMEM_FRAME_SIZE;
101                 printf("%p: tx_desc[%d] -> %lx\n", xsk, i, addr);
102         }
103
104         /* Second half of umem is for RX. */
105
106         ret = xsk_ring_prod__reserve(&xsk->fill, UMEM_NUM / 2, &idx);
107         for (i = 0; i < UMEM_NUM / 2; i++) {
108                 addr = (UMEM_NUM / 2 + i) * UMEM_FRAME_SIZE;
109                 printf("%p: rx_desc[%d] -> %lx\n", xsk, i, addr);
110                 *xsk_ring_prod__fill_addr(&xsk->fill, i) = addr;
111         }
112         xsk_ring_prod__submit(&xsk->fill, ret);
113
114         return 0;
115 }
116
117 static void close_xsk(struct xsk *xsk)
118 {
119         if (xsk->umem)
120                 xsk_umem__delete(xsk->umem);
121         if (xsk->socket)
122                 xsk_socket__delete(xsk->socket);
123         munmap(xsk->umem_area, UMEM_SIZE);
124 }
125
126 static void refill_rx(struct xsk *xsk, __u64 addr)
127 {
128         __u32 idx;
129
130         if (xsk_ring_prod__reserve(&xsk->fill, 1, &idx) == 1) {
131                 printf("%p: complete idx=%u addr=%llx\n", xsk, idx, addr);
132                 *xsk_ring_prod__fill_addr(&xsk->fill, idx) = addr;
133                 xsk_ring_prod__submit(&xsk->fill, 1);
134         }
135 }
136
137 static void verify_xdp_metadata(void *data)
138 {
139         struct xdp_meta *meta;
140
141         meta = data - sizeof(*meta);
142
143         printf("rx_timestamp: %llu\n", meta->rx_timestamp);
144         printf("rx_hash: %u\n", meta->rx_hash);
145 }
146
147 static void verify_skb_metadata(int fd)
148 {
149         char cmsg_buf[1024];
150         char packet_buf[128];
151
152         struct scm_timestamping *ts;
153         struct iovec packet_iov;
154         struct cmsghdr *cmsg;
155         struct msghdr hdr;
156
157         memset(&hdr, 0, sizeof(hdr));
158         hdr.msg_iov = &packet_iov;
159         hdr.msg_iovlen = 1;
160         packet_iov.iov_base = packet_buf;
161         packet_iov.iov_len = sizeof(packet_buf);
162
163         hdr.msg_control = cmsg_buf;
164         hdr.msg_controllen = sizeof(cmsg_buf);
165
166         if (recvmsg(fd, &hdr, 0) < 0)
167                 error(1, errno, "recvmsg");
168
169         for (cmsg = CMSG_FIRSTHDR(&hdr); cmsg != NULL;
170              cmsg = CMSG_NXTHDR(&hdr, cmsg)) {
171
172                 if (cmsg->cmsg_level != SOL_SOCKET)
173                         continue;
174
175                 switch (cmsg->cmsg_type) {
176                 case SCM_TIMESTAMPING:
177                         ts = (struct scm_timestamping *)CMSG_DATA(cmsg);
178                         if (ts->ts[2].tv_sec || ts->ts[2].tv_nsec) {
179                                 printf("found skb hwtstamp = %lu.%lu\n",
180                                        ts->ts[2].tv_sec, ts->ts[2].tv_nsec);
181                                 return;
182                         }
183                         break;
184                 default:
185                         break;
186                 }
187         }
188
189         printf("skb hwtstamp is not found!\n");
190 }
191
192 static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd)
193 {
194         const struct xdp_desc *rx_desc;
195         struct pollfd fds[rxq + 1];
196         __u64 comp_addr;
197         __u64 addr;
198         __u32 idx;
199         int ret;
200         int i;
201
202         for (i = 0; i < rxq; i++) {
203                 fds[i].fd = xsk_socket__fd(rx_xsk[i].socket);
204                 fds[i].events = POLLIN;
205                 fds[i].revents = 0;
206         }
207
208         fds[rxq].fd = server_fd;
209         fds[rxq].events = POLLIN;
210         fds[rxq].revents = 0;
211
212         while (true) {
213                 errno = 0;
214                 ret = poll(fds, rxq + 1, 1000);
215                 printf("poll: %d (%d)\n", ret, errno);
216                 if (ret < 0)
217                         break;
218                 if (ret == 0)
219                         continue;
220
221                 if (fds[rxq].revents)
222                         verify_skb_metadata(server_fd);
223
224                 for (i = 0; i < rxq; i++) {
225                         if (fds[i].revents == 0)
226                                 continue;
227
228                         struct xsk *xsk = &rx_xsk[i];
229
230                         ret = xsk_ring_cons__peek(&xsk->rx, 1, &idx);
231                         printf("xsk_ring_cons__peek: %d\n", ret);
232                         if (ret != 1)
233                                 continue;
234
235                         rx_desc = xsk_ring_cons__rx_desc(&xsk->rx, idx);
236                         comp_addr = xsk_umem__extract_addr(rx_desc->addr);
237                         addr = xsk_umem__add_offset_to_addr(rx_desc->addr);
238                         printf("%p: rx_desc[%u]->addr=%llx addr=%llx comp_addr=%llx\n",
239                                xsk, idx, rx_desc->addr, addr, comp_addr);
240                         verify_xdp_metadata(xsk_umem__get_data(xsk->umem_area, addr));
241                         xsk_ring_cons__release(&xsk->rx, 1);
242                         refill_rx(xsk, comp_addr);
243                 }
244         }
245
246         return 0;
247 }
248
249 struct ethtool_channels {
250         __u32   cmd;
251         __u32   max_rx;
252         __u32   max_tx;
253         __u32   max_other;
254         __u32   max_combined;
255         __u32   rx_count;
256         __u32   tx_count;
257         __u32   other_count;
258         __u32   combined_count;
259 };
260
261 #define ETHTOOL_GCHANNELS       0x0000003c /* Get no of channels */
262
263 static int rxq_num(const char *ifname)
264 {
265         struct ethtool_channels ch = {
266                 .cmd = ETHTOOL_GCHANNELS,
267         };
268
269         struct ifreq ifr = {
270                 .ifr_data = (void *)&ch,
271         };
272         strncpy(ifr.ifr_name, ifname, IF_NAMESIZE - 1);
273         int fd, ret;
274
275         fd = socket(AF_UNIX, SOCK_DGRAM, 0);
276         if (fd < 0)
277                 error(1, errno, "socket");
278
279         ret = ioctl(fd, SIOCETHTOOL, &ifr);
280         if (ret < 0)
281                 error(1, errno, "ioctl(SIOCETHTOOL)");
282
283         close(fd);
284
285         return ch.rx_count + ch.combined_count;
286 }
287
288 static void hwtstamp_ioctl(int op, const char *ifname, struct hwtstamp_config *cfg)
289 {
290         struct ifreq ifr = {
291                 .ifr_data = (void *)cfg,
292         };
293         strncpy(ifr.ifr_name, ifname, IF_NAMESIZE - 1);
294         int fd, ret;
295
296         fd = socket(AF_UNIX, SOCK_DGRAM, 0);
297         if (fd < 0)
298                 error(1, errno, "socket");
299
300         ret = ioctl(fd, op, &ifr);
301         if (ret < 0)
302                 error(1, errno, "ioctl(%d)", op);
303
304         close(fd);
305 }
306
307 static struct hwtstamp_config saved_hwtstamp_cfg;
308 static const char *saved_hwtstamp_ifname;
309
310 static void hwtstamp_restore(void)
311 {
312         hwtstamp_ioctl(SIOCSHWTSTAMP, saved_hwtstamp_ifname, &saved_hwtstamp_cfg);
313 }
314
315 static void hwtstamp_enable(const char *ifname)
316 {
317         struct hwtstamp_config cfg = {
318                 .rx_filter = HWTSTAMP_FILTER_ALL,
319         };
320
321         hwtstamp_ioctl(SIOCGHWTSTAMP, ifname, &saved_hwtstamp_cfg);
322         saved_hwtstamp_ifname = strdup(ifname);
323         atexit(hwtstamp_restore);
324
325         hwtstamp_ioctl(SIOCSHWTSTAMP, ifname, &cfg);
326 }
327
328 static void cleanup(void)
329 {
330         LIBBPF_OPTS(bpf_xdp_attach_opts, opts);
331         int ret;
332         int i;
333
334         if (bpf_obj) {
335                 opts.old_prog_fd = bpf_program__fd(bpf_obj->progs.rx);
336                 if (opts.old_prog_fd >= 0) {
337                         printf("detaching bpf program....\n");
338                         ret = bpf_xdp_detach(ifindex, XDP_FLAGS, &opts);
339                         if (ret)
340                                 printf("failed to detach XDP program: %d\n", ret);
341                 }
342         }
343
344         for (i = 0; i < rxq; i++)
345                 close_xsk(&rx_xsk[i]);
346
347         if (bpf_obj)
348                 xdp_hw_metadata__destroy(bpf_obj);
349 }
350
351 static void handle_signal(int sig)
352 {
353         /* interrupting poll() is all we need */
354 }
355
356 static void timestamping_enable(int fd, int val)
357 {
358         int ret;
359
360         ret = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, &val, sizeof(val));
361         if (ret < 0)
362                 error(1, errno, "setsockopt(SO_TIMESTAMPING)");
363 }
364
365 int main(int argc, char *argv[])
366 {
367         int server_fd = -1;
368         int ret;
369         int i;
370
371         struct bpf_program *prog;
372
373         if (argc != 2) {
374                 fprintf(stderr, "pass device name\n");
375                 return -1;
376         }
377
378         ifname = argv[1];
379         ifindex = if_nametoindex(ifname);
380         rxq = rxq_num(ifname);
381
382         printf("rxq: %d\n", rxq);
383
384         hwtstamp_enable(ifname);
385
386         rx_xsk = malloc(sizeof(struct xsk) * rxq);
387         if (!rx_xsk)
388                 error(1, ENOMEM, "malloc");
389
390         for (i = 0; i < rxq; i++) {
391                 printf("open_xsk(%s, %p, %d)\n", ifname, &rx_xsk[i], i);
392                 ret = open_xsk(ifindex, &rx_xsk[i], i);
393                 if (ret)
394                         error(1, -ret, "open_xsk");
395
396                 printf("xsk_socket__fd() -> %d\n", xsk_socket__fd(rx_xsk[i].socket));
397         }
398
399         printf("open bpf program...\n");
400         bpf_obj = xdp_hw_metadata__open();
401         if (libbpf_get_error(bpf_obj))
402                 error(1, libbpf_get_error(bpf_obj), "xdp_hw_metadata__open");
403
404         prog = bpf_object__find_program_by_name(bpf_obj->obj, "rx");
405         bpf_program__set_ifindex(prog, ifindex);
406         bpf_program__set_flags(prog, BPF_F_XDP_DEV_BOUND_ONLY);
407
408         printf("load bpf program...\n");
409         ret = xdp_hw_metadata__load(bpf_obj);
410         if (ret)
411                 error(1, -ret, "xdp_hw_metadata__load");
412
413         printf("prepare skb endpoint...\n");
414         server_fd = start_server(AF_INET6, SOCK_DGRAM, NULL, 9092, 1000);
415         if (server_fd < 0)
416                 error(1, errno, "start_server");
417         timestamping_enable(server_fd,
418                             SOF_TIMESTAMPING_SOFTWARE |
419                             SOF_TIMESTAMPING_RAW_HARDWARE);
420
421         printf("prepare xsk map...\n");
422         for (i = 0; i < rxq; i++) {
423                 int sock_fd = xsk_socket__fd(rx_xsk[i].socket);
424                 __u32 queue_id = i;
425
426                 printf("map[%d] = %d\n", queue_id, sock_fd);
427                 ret = bpf_map_update_elem(bpf_map__fd(bpf_obj->maps.xsk), &queue_id, &sock_fd, 0);
428                 if (ret)
429                         error(1, -ret, "bpf_map_update_elem");
430         }
431
432         printf("attach bpf program...\n");
433         ret = bpf_xdp_attach(ifindex,
434                              bpf_program__fd(bpf_obj->progs.rx),
435                              XDP_FLAGS, NULL);
436         if (ret)
437                 error(1, -ret, "bpf_xdp_attach");
438
439         signal(SIGINT, handle_signal);
440         ret = verify_metadata(rx_xsk, rxq, server_fd);
441         close(server_fd);
442         cleanup();
443         if (ret)
444                 error(1, -ret, "verify_metadata");
445 }