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Date: Thu, 2 Dec 2021 06:22:37 +0200
From: Parav Pandit <parav@...dia.com>
To: <dsahern@...il.com>, <stephen@...workplumber.org>,
<netdev@...r.kernel.org>
CC: <virtualization@...ts.linux-foundation.org>, <mst@...hat.com>,
<jasowang@...hat.com>, Parav Pandit <parav@...dia.com>
Subject: [iproute2-next 2/4] vdpa: Enable user to query vdpa device config layout
Query the device configuration layout whenever kernel supports it.
An example of configuration layout of vdpa device of type network:
$ vdpa dev add name bar mgmtdev vdpasim_net
$ vdpa dev config show
bar: mac 00:35:09:19:48:05 link up link_announce false mtu 1500
$ vdpa dev config show -jp
{
"config": {
"bar": {
"mac": "00:35:09:19:48:05",
"link ": "up",
"link_announce ": false,
"mtu": 1500,
}
}
}
Signed-off-by: Parav Pandit <parav@...dia.com>
---
vdpa/vdpa.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 110 insertions(+)
diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index 7fdb36b9..ba704254 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -6,9 +6,11 @@
#include <linux/genetlink.h>
#include <linux/vdpa.h>
#include <linux/virtio_ids.h>
+#include <linux/virtio_net.h>
#include <linux/netlink.h>
#include <libmnl/libmnl.h>
#include "mnl_utils.h"
+#include <rt_names.h>
#include "version.h"
#include "json_print.h"
@@ -413,6 +415,7 @@ static void cmd_dev_help(void)
fprintf(stderr, "Usage: vdpa dev show [ DEV ]\n");
fprintf(stderr, " vdpa dev add name NAME mgmtdev MANAGEMENTDEV\n");
fprintf(stderr, " vdpa dev del DEV\n");
+ fprintf(stderr, "Usage: vdpa dev config COMMAND [ OPTIONS ]\n");
}
static const char *device_type_name(uint32_t type)
@@ -520,6 +523,111 @@ static int cmd_dev_del(struct vdpa *vdpa, int argc, char **argv)
return mnlu_gen_socket_sndrcv(&vdpa->nlg, nlh, NULL, NULL);
}
+static void pr_out_dev_net_config(struct nlattr **tb)
+{
+ SPRINT_BUF(macaddr);
+ uint16_t val_u16;
+
+ if (tb[VDPA_ATTR_DEV_NET_CFG_MACADDR]) {
+ const unsigned char *data;
+ uint16_t len;
+
+ len = mnl_attr_get_payload_len(tb[VDPA_ATTR_DEV_NET_CFG_MACADDR]);
+ data = mnl_attr_get_payload(tb[VDPA_ATTR_DEV_NET_CFG_MACADDR]);
+
+ print_string(PRINT_ANY, "mac", "mac %s ",
+ ll_addr_n2a(data, len, 0, macaddr, sizeof(macaddr)));
+ }
+ if (tb[VDPA_ATTR_DEV_NET_STATUS]) {
+ val_u16 = mnl_attr_get_u16(tb[VDPA_ATTR_DEV_NET_STATUS]);
+ print_string(PRINT_ANY, "link ", "link %s ",
+ (val_u16 & VIRTIO_NET_S_LINK_UP) ? "up" : "down");
+ print_bool(PRINT_ANY, "link_announce ", "link_announce %s ",
+ (val_u16 & VIRTIO_NET_S_ANNOUNCE) ? true : false);
+ }
+ if (tb[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]) {
+ val_u16 = mnl_attr_get_u16(tb[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]);
+ print_uint(PRINT_ANY, "max_vq_pairs", "max_vq_pairs %d ",
+ val_u16);
+ }
+ if (tb[VDPA_ATTR_DEV_NET_CFG_MTU]) {
+ val_u16 = mnl_attr_get_u16(tb[VDPA_ATTR_DEV_NET_CFG_MTU]);
+ print_uint(PRINT_ANY, "mtu", "mtu %d ", val_u16);
+ }
+}
+
+static void pr_out_dev_config(struct vdpa *vdpa, struct nlattr **tb)
+{
+ uint32_t device_id = mnl_attr_get_u32(tb[VDPA_ATTR_DEV_ID]);
+
+ pr_out_vdev_handle_start(vdpa, tb);
+ switch (device_id) {
+ case VIRTIO_ID_NET:
+ pr_out_dev_net_config(tb);
+ break;
+ default:
+ break;
+ }
+ pr_out_vdev_handle_end(vdpa);
+}
+
+static int cmd_dev_config_show_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh);
+ struct nlattr *tb[VDPA_ATTR_MAX + 1] = {};
+ struct vdpa *vdpa = data;
+
+ mnl_attr_parse(nlh, sizeof(*genl), attr_cb, tb);
+ if (!tb[VDPA_ATTR_DEV_NAME] || !tb[VDPA_ATTR_DEV_ID])
+ return MNL_CB_ERROR;
+ pr_out_dev_config(vdpa, tb);
+ return MNL_CB_OK;
+}
+
+static int cmd_dev_config_show(struct vdpa *vdpa, int argc, char **argv)
+{
+ uint16_t flags = NLM_F_REQUEST | NLM_F_ACK;
+ struct nlmsghdr *nlh;
+ int err;
+
+ if (argc <= 0)
+ flags |= NLM_F_DUMP;
+
+ nlh = mnlu_gen_socket_cmd_prepare(&vdpa->nlg, VDPA_CMD_DEV_CONFIG_GET,
+ flags);
+ if (argc > 0) {
+ err = vdpa_argv_parse_put(nlh, vdpa, argc, argv,
+ VDPA_OPT_VDEV_HANDLE);
+ if (err)
+ return err;
+ }
+
+ pr_out_section_start(vdpa, "config");
+ err = mnlu_gen_socket_sndrcv(&vdpa->nlg, nlh, cmd_dev_config_show_cb, vdpa);
+ pr_out_section_end(vdpa);
+ return err;
+}
+
+static void cmd_dev_config_help(void)
+{
+ fprintf(stderr, "Usage: vdpa dev config show [ DEV ]\n");
+}
+
+static int cmd_dev_config(struct vdpa *vdpa, int argc, char **argv)
+{
+ if (!argc)
+ return cmd_dev_config_show(vdpa, argc - 1, argv + 1);
+
+ if (matches(*argv, "help") == 0) {
+ cmd_dev_config_help();
+ return 0;
+ } else if (matches(*argv, "show") == 0) {
+ return cmd_dev_config_show(vdpa, argc - 1, argv + 1);
+ }
+ fprintf(stderr, "Command \"%s\" not found\n", *argv);
+ return -ENOENT;
+}
+
static int cmd_dev(struct vdpa *vdpa, int argc, char **argv)
{
if (!argc)
@@ -535,6 +643,8 @@ static int cmd_dev(struct vdpa *vdpa, int argc, char **argv)
return cmd_dev_add(vdpa, argc - 1, argv + 1);
} else if (matches(*argv, "del") == 0) {
return cmd_dev_del(vdpa, argc - 1, argv + 1);
+ } else if (matches(*argv, "config") == 0) {
+ return cmd_dev_config(vdpa, argc - 1, argv + 1);
}
fprintf(stderr, "Command \"%s\" not found\n", *argv);
return -ENOENT;
--
2.26.2
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