netdev - [PATCH] vdpa: add the support to set mac address and MTU

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Date: Tue, 11 Jun 2024 13:36:10 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
	dtatulea@...dia.com,
	mst@...hat.com,
	jasowang@...hat.com,
	parav@...dia.com,
	netdev@...r.kernel.org
Subject: [PATCH] vdpa: add the support to set mac address and MTU

Add new function to support the MAC address and MTU from VDPA tool.
The kernel now only supports setting the MAC address.

The usage is vdpa dev set name vdpa_name mac **:**:**:**:**

here is sample:
root@L1# vdpa -jp dev config show vdpa0
{
    "config": {
        "vdpa0": {
            "mac": "82:4d:e9:5d:d7:e6",
            "link ": "up",
            "link_announce ": false,
            "mtu": 1500
        }
    }
}

root@L1# vdpa dev set name vdpa0 mac 00:11:22:33:44:55

root@L1# vdpa -jp dev config show vdpa0
{
    "config": {
        "vdpa0": {
            "mac": "00:11:22:33:44:55",
            "link ": "up",
            "link_announce ": false,
            "mtu": 1500
        }
    }
}

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 vdpa/include/uapi/linux/vdpa.h |  1 +
 vdpa/vdpa.c                    | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/vdpa/include/uapi/linux/vdpa.h b/vdpa/include/uapi/linux/vdpa.h
index 8586bd17..7bd8d8aa 100644
--- a/vdpa/include/uapi/linux/vdpa.h
+++ b/vdpa/include/uapi/linux/vdpa.h
@@ -19,6 +19,7 @@ enum vdpa_command {
 	VDPA_CMD_DEV_GET,		/* can dump */
 	VDPA_CMD_DEV_CONFIG_GET,	/* can dump */
 	VDPA_CMD_DEV_VSTATS_GET,
+	VDPA_CMD_DEV_CONFIG_SET,
 };
 
 enum vdpa_attr {
diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index 6e4a9c11..72328a13 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -758,6 +758,22 @@ static int cmd_dev_del(struct vdpa *vdpa,  int argc, char **argv)
 	return mnlu_gen_socket_sndrcv(&vdpa->nlg, nlh, NULL, NULL);
 }
 
+static int cmd_dev_set(struct vdpa *vdpa, int argc, char **argv)
+{
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = mnlu_gen_socket_cmd_prepare(&vdpa->nlg, VDPA_CMD_DEV_CONFIG_SET,
+					  NLM_F_REQUEST | NLM_F_ACK);
+	err = vdpa_argv_parse_put(nlh, vdpa, argc, argv,
+				  VDPA_OPT_VDEV_NAME,
+				  VDPA_OPT_VDEV_MAC|VDPA_OPT_VDEV_MTU);
+	if (err)
+		return err;
+
+	return mnlu_gen_socket_sndrcv(&vdpa->nlg, nlh, NULL, NULL);
+}
+
 static void pr_out_dev_net_config(struct vdpa *vdpa, struct nlattr **tb)
 {
 	SPRINT_BUF(macaddr);
@@ -1028,6 +1044,9 @@ static int cmd_dev(struct vdpa *vdpa, int argc, char **argv)
 	} else if (!strcmp(*argv, "vstats")) {
 		return cmd_dev_vstats(vdpa, argc - 1, argv + 1);
 	}
+	else if (!strcmp(*argv, "set")) {
+		return cmd_dev_set(vdpa, argc - 1, argv + 1);
+	}
 	fprintf(stderr, "Command \"%s\" not found\n", *argv);
 	return -ENOENT;
 }
-- 
2.45.0