tools: ynl: add sample for ethtool

Configuring / reading ring sizes and counts is a fairly common
operation for ethtool netlink. Present a sample doing that with
YNL:

$ ./ethtool
Channels:
    enp1s0: combined 1
   eni1np1: combined 1
   eni2np1: combined 1
Rings:
    enp1s0: rx 256 tx 256
   eni1np1: rx 0 tx 0
   eni2np1: rx 0 tx 0

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/net/ynl/samples/.gitignore b/tools/net/ynl/samples/.gitignore
index a24678b..2aae60c 100644 (file)
--- a/tools/net/ynl/samples/.gitignore
+++ b/tools/net/ynl/samples/.gitignore
@@ -1,2 +1,3 @@
+ethtool
 devlink
 netdev

diff --git a/tools/net/ynl/samples/ethtool.c b/tools/net/ynl/samples/ethtool.c
new file mode 100644 (file)
index 0000000..a7ebbd1
--- /dev/null
+++ b/tools/net/ynl/samples/ethtool.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <string.h>
+
+#include <ynl.h>
+
+#include <net/if.h>
+
+#include "ethtool-user.h"
+
+int main(int argc, char **argv)
+{
+       struct ethtool_channels_get_req_dump creq = {};
+       struct ethtool_rings_get_req_dump rreq = {};
+       struct ethtool_channels_get_list *channels;
+       struct ethtool_rings_get_list *rings;
+       struct ynl_sock *ys;
+
+       ys = ynl_sock_create(&ynl_ethtool_family, NULL);
+       if (!ys)
+               return 1;
+
+       creq._present.header = 1; /* ethtool needs an empty nest, sigh */
+       channels = ethtool_channels_get_dump(ys, &creq);
+       if (!channels)
+               goto err_close;
+
+       printf("Channels:\n");
+       ynl_dump_foreach(channels, dev) {
+               printf("  %8s: ", dev->header.dev_name);
+               if (dev->_present.rx_count)
+                       printf("rx %d ", dev->rx_count);
+               if (dev->_present.tx_count)
+                       printf("tx %d ", dev->tx_count);
+               if (dev->_present.combined_count)
+                       printf("combined %d ", dev->combined_count);
+               printf("\n");
+       }
+       ethtool_channels_get_list_free(channels);
+
+       rreq._present.header = 1; /* ethtool needs an empty nest.. */
+       rings = ethtool_rings_get_dump(ys, &rreq);
+       if (!rings)
+               goto err_close;
+
+       printf("Rings:\n");
+       ynl_dump_foreach(rings, dev) {
+               printf("  %8s: ", dev->header.dev_name);
+               if (dev->_present.rx)
+                       printf("rx %d ", dev->rx);
+               if (dev->_present.tx)
+                       printf("tx %d ", dev->tx);
+               printf("\n");
+       }
+       ethtool_rings_get_list_free(rings);
+
+       ynl_sock_destroy(ys);
+
+       return 0;
+
+err_close:
+       fprintf(stderr, "YNL (%d): %s\n", ys->err.code, ys->err.msg);
+       ynl_sock_destroy(ys);
+       return 2;
+}