tools/net/ynl/samples/netdev.c

   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
  19 static 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
  61 int 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, 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, 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((struct netdev_dev_get_rsp *)&ntf->data,
 116                                     ntf->cmd);
 117                 ynl_ntf_free(ntf);
 118         }
 119
 120         ynl_sock_destroy(ys);
 121         return 0;
 122
 123 err_close:
 124         fprintf(stderr, "YNL: %s\n", ys->err.msg);
 125 err_destroy:
 126         ynl_sock_destroy(ys);
 127         return 2;
 128 }