1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include <string.h>
4
5#include <ynl.h>
6
7#include <net/if.h>
8
9#include "netdev-user.h"
10
11/* netdev genetlink family code sample
12 * This sample shows off basics of the netdev family but also notification
13 * handling, hence the somewhat odd UI. We subscribe to notifications first
14 * then wait for ifc selection, so the socket may already accumulate
15 * notifications as we wait. This allows us to test that YNL can handle
16 * requests and notifications getting interleaved.
17 */
18
19static void netdev_print_device(struct netdev_dev_get_rsp *d, unsigned int op)
20{
21 char ifname[IF_NAMESIZE];
22 const char *name;
23
24 if (!d->_present.ifindex)
25 return;
26
27 name = if_indextoname(d->ifindex, ifname);
28 if (name)
29 printf("%8s", name);
30 printf("[%d]\t", d->ifindex);
31
32 if (!d->_present.xdp_features)
33 return;
34
35 printf("xdp-features (%llx):", d->xdp_features);
36 for (int i = 0; d->xdp_features >= 1U << i; i++) {
37 if (d->xdp_features & (1U << i))
38 printf(" %s", netdev_xdp_act_str(1 << i));
39 }
40
41 printf(" xdp-rx-metadata-features (%llx):", d->xdp_rx_metadata_features);
42 for (int i = 0; d->xdp_rx_metadata_features >= 1U << i; i++) {
43 if (d->xdp_rx_metadata_features & (1U << i))
44 printf(" %s", netdev_xdp_rx_metadata_str(1 << i));
45 }
46
47 printf(" xsk-features (%llx):", d->xsk_features);
48 for (int i = 0; d->xsk_features >= 1U << i; i++) {
49 if (d->xsk_features & (1U << i))
50 printf(" %s", netdev_xsk_flags_str(1 << i));
51 }
52
53 printf(" xdp-zc-max-segs=%u", d->xdp_zc_max_segs);
54
55 name = netdev_op_str(op);
56 if (name)
57 printf(" (ntf: %s)", name);
58 printf("\n");
59}
60
61int main(int argc, char **argv)
62{
63 struct netdev_dev_get_list *devs;
64 struct ynl_ntf_base_type *ntf;
65 struct ynl_error yerr;
66 struct ynl_sock *ys;
67 int ifindex = 0;
68
69 if (argc > 1)
70 ifindex = strtol(argv[1], NULL, 0);
71
72 ys = ynl_sock_create(&ynl_netdev_family, &yerr);
73 if (!ys) {
74 fprintf(stderr, "YNL: %s\n", yerr.msg);
75 return 1;
76 }
77
78 if (ynl_subscribe(ys, "mgmt"))
79 goto err_close;
80
81 printf("Select ifc ($ifindex; or 0 = dump; or -2 ntf check): ");
82 if (scanf("%d", &ifindex) != 1) {
83 fprintf(stderr, "Error: unable to parse input\n");
84 goto err_destroy;
85 }
86
87 if (ifindex > 0) {
88 struct netdev_dev_get_req *req;
89 struct netdev_dev_get_rsp *d;
90
91 req = netdev_dev_get_req_alloc();
92 netdev_dev_get_req_set_ifindex(req, ifindex);
93
94 d = netdev_dev_get(ys, req);
95 netdev_dev_get_req_free(req);
96 if (!d)
97 goto err_close;
98
99 netdev_print_device(d, op: 0);
100 netdev_dev_get_rsp_free(d);
101 } else if (!ifindex) {
102 devs = netdev_dev_get_dump(ys);
103 if (!devs)
104 goto err_close;
105
106 if (ynl_dump_empty(devs))
107 fprintf(stderr, "Error: no devices reported\n");
108 ynl_dump_foreach(devs, d)
109 netdev_print_device(d: d, op: 0);
110 netdev_dev_get_list_free(devs);
111 } else if (ifindex == -2) {
112 ynl_ntf_check(ys);
113 }
114 while ((ntf = ynl_ntf_dequeue(ys))) {
115 netdev_print_device(d: (struct netdev_dev_get_rsp *)&ntf->data,
116 op: ntf->cmd);
117 ynl_ntf_free(ntf);
118 }
119
120 ynl_sock_destroy(ys);
121 return 0;
122
123err_close:
124 fprintf(stderr, "YNL: %s\n", ys->err.msg);
125err_destroy:
126 ynl_sock_destroy(ys);
127 return 2;
128}
129

source code of linux/tools/net/ynl/samples/netdev.c