Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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(" xdp-zc-max-segs=%u", d->xdp_zc_max_segs);
48
49 name = netdev_op_str(op);
50 if (name)
51 printf(" (ntf: %s)", name);
52 printf("\n");
53}
54
55int main(int argc, char **argv)
56{
57 struct netdev_dev_get_list *devs;
58 struct ynl_ntf_base_type *ntf;
59 struct ynl_error yerr;
60 struct ynl_sock *ys;
61 int ifindex = 0;
62
63 if (argc > 1)
64 ifindex = strtol(argv[1], NULL, 0);
65
66 ys = ynl_sock_create(&ynl_netdev_family, &yerr);
67 if (!ys) {
68 fprintf(stderr, "YNL: %s\n", yerr.msg);
69 return 1;
70 }
71
72 if (ynl_subscribe(ys, "mgmt"))
73 goto err_close;
74
75 printf("Select ifc ($ifindex; or 0 = dump; or -2 ntf check): ");
76 scanf("%d", &ifindex);
77
78 if (ifindex > 0) {
79 struct netdev_dev_get_req *req;
80 struct netdev_dev_get_rsp *d;
81
82 req = netdev_dev_get_req_alloc();
83 netdev_dev_get_req_set_ifindex(req, ifindex);
84
85 d = netdev_dev_get(ys, req);
86 netdev_dev_get_req_free(req);
87 if (!d)
88 goto err_close;
89
90 netdev_print_device(d, 0);
91 netdev_dev_get_rsp_free(d);
92 } else if (!ifindex) {
93 devs = netdev_dev_get_dump(ys);
94 if (!devs)
95 goto err_close;
96
97 ynl_dump_foreach(devs, d)
98 netdev_print_device(d, 0);
99 netdev_dev_get_list_free(devs);
100 } else if (ifindex == -2) {
101 ynl_ntf_check(ys);
102 }
103 while ((ntf = ynl_ntf_dequeue(ys))) {
104 netdev_print_device((struct netdev_dev_get_rsp *)&ntf->data,
105 ntf->cmd);
106 ynl_ntf_free(ntf);
107 }
108
109 ynl_sock_destroy(ys);
110 return 0;
111
112err_close:
113 fprintf(stderr, "YNL: %s\n", ys->err.msg);
114 ynl_sock_destroy(ys);
115 return 2;
116}