On 2021/2/24 2:18 下午, Parav Pandit wrote:
Introduce a command to query a device config layout.
An example query of network vdpa device:
$ 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 speed 0 duplex 0
$ vdpa dev config show -jp
{
"config": {
"bar": {
"mac": "00:35:09:19:48:05",
"link ": "up",
"link_announce ": false,
"mtu": 1500,
"speed": 0,
"duplex": 0
}
}
}
Signed-off-by: Parav Pandit <parav@xxxxxxxxxx>
Reviewed-by: Eli Cohen <elic@xxxxxxxxxx>
---
changelog:
v1->v2:
- read whole net config layout instead of individual fields
- added error extack for unmanaged vdpa device
---
drivers/vdpa/vdpa.c | 181 ++++++++++++++++++++++++++++++++++++++
include/uapi/linux/vdpa.h | 11 +++
2 files changed, 192 insertions(+)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 3d997b389345..cebbba500638 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -14,6 +14,8 @@
#include <uapi/linux/vdpa.h>
#include <net/genetlink.h>
#include <linux/mod_devicetable.h>
+#include <linux/virtio_net.h>
+#include <linux/virtio_ids.h>
static LIST_HEAD(mdev_head);
/* A global mutex that protects vdpa management device and device level operations. */
@@ -603,6 +605,179 @@ static int vdpa_nl_cmd_dev_get_dumpit(struct sk_buff *msg, struct netlink_callba
return msg->len;
}
+static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
+ struct sk_buff *msg,
+ const struct virtio_net_config *config)
+{
+ u32 hash_types;
+ u16 rss_field;
+ u64 features;
+
+ features = vdev->config->get_features(vdev);
+ if ((features & (1ULL << VIRTIO_NET_F_MQ)) == 0)
+ return 0;
+
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP,
+ config->max_virtqueue_pairs))
+ return -EMSGSIZE;
We probably need to check VIRTIO_NET_F_RSS here.
+ if (nla_put_u8(msg, VDPA_ATTR_DEV_NET_CFG_RSS_MAX_KEY_LEN,
+ config->rss_max_key_size))
+ return -EMSGSIZE;
+
+ rss_field = le16_to_cpu(config->rss_max_key_size);
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_RSS_MAX_IT_LEN, rss_field))
+ return -EMSGSIZE;
+
+ hash_types = le32_to_cpu(config->supported_hash_types);
+ if (nla_put_u32(msg, VDPA_ATTR_DEV_NET_CFG_RSS_HASH_TYPES,
+ config->supported_hash_types))
+ return -EMSGSIZE;
+ return 0;
+}
+
+static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
+{
+ struct virtio_net_config config = {};
+
+ vdev->config->get_config(vdev, 0, &config, sizeof(config));
Do we need to sync with other possible get_config calls here?
+ if (nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, sizeof(config.mac), config.mac))
+ return -EMSGSIZE;
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, config.status))
+ return -EMSGSIZE;
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, config.mtu))
+ return -EMSGSIZE;
And check VIRTIO_NET_F_SPEED_DUPLEX.
+ if (nla_put_u32(msg, VDPA_ATTR_DEV_NET_CFG_SPEED, config.speed))
+ return -EMSGSIZE;
+ if (nla_put_u8(msg, VDPA_ATTR_DEV_NET_CFG_DUPLEX, config.duplex))
+ return -EMSGSIZE;
+
+ return vdpa_dev_net_mq_config_fill(vdev, msg, &config);
+}
+
+static int
+vdpa_dev_config_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq,
+ int flags, struct netlink_ext_ack *extack)
+{
+ u32 device_id;
+ void *hdr;
+ int err;
+
+ hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags,
+ VDPA_CMD_DEV_CONFIG_GET);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) {
+ err = -EMSGSIZE;
+ goto msg_err;
+ }
+
+ device_id = vdev->config->get_device_id(vdev);
+ if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id)) {
+ err = -EMSGSIZE;
+ goto msg_err;
+ }
+
+ switch (device_id) {
+ case VIRTIO_ID_NET:
+ err = vdpa_dev_net_config_fill(vdev, msg);
+ break;
+ default:
+ err = -EOPNOTSUPP;
+ break;
+ }
+ if (err)
+ goto msg_err;
+
+ genlmsg_end(msg, hdr);
+ return 0;
+
+msg_err:
+ genlmsg_cancel(msg, hdr);
+ return err;
+}
+
+static int vdpa_nl_cmd_dev_config_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ struct vdpa_device *vdev;
+ struct sk_buff *msg;
+ const char *devname;
+ struct device *dev;
+ int err;
+
+ if (!info->attrs[VDPA_ATTR_DEV_NAME])
+ return -EINVAL;
+ devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ mutex_lock(&vdpa_dev_mutex);
+ dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match);
+ if (!dev) {
+ NL_SET_ERR_MSG_MOD(info->extack, "device not found");
+ err = -ENODEV;
+ goto dev_err;
+ }
+ vdev = container_of(dev, struct vdpa_device, dev);
+ if (!vdev->mdev) {
+ NL_SET_ERR_MSG_MOD(info->extack, "unmanaged vdpa device");
+ err = -EINVAL;
+ goto mdev_err;
+ }
Though it's fine but it looks to me mdev is not required to work here.
+ err = vdpa_dev_config_fill(vdev, msg, info->snd_portid, info->snd_seq,
+ 0, info->extack);
+ if (!err)
+ err = genlmsg_reply(msg, info);
+
+mdev_err:
+ put_device(dev);
+dev_err:
+ mutex_unlock(&vdpa_dev_mutex);
+ if (err)
+ nlmsg_free(msg);
+ return err;
+}
+
+static int vdpa_dev_config_dump(struct device *dev, void *data)
+{
+ struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
+ struct vdpa_dev_dump_info *info = data;
+ int err;
+
+ if (!vdev->mdev)
+ return 0;
+ if (info->idx < info->start_idx) {
+ info->idx++;
+ return 0;
+ }
+ err = vdpa_dev_config_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid,
+ info->cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ info->cb->extack);
+ if (err)
+ return err;
+
+ info->idx++;
+ return 0;
+}
+
+static int
+vdpa_nl_cmd_dev_config_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
+{
+ struct vdpa_dev_dump_info info;
+
+ info.msg = msg;
+ info.cb = cb;
+ info.start_idx = cb->args[0];
+ info.idx = 0;
+
+ mutex_lock(&vdpa_dev_mutex);
+ bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_config_dump);
+ mutex_unlock(&vdpa_dev_mutex);
+ cb->args[0] = info.idx;
+ return msg->len;
+}
+
static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = {
[VDPA_ATTR_MGMTDEV_BUS_NAME] = { .type = NLA_NUL_STRING },
[VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING },
@@ -634,6 +809,12 @@ static const struct genl_ops vdpa_nl_ops[] = {
.doit = vdpa_nl_cmd_dev_get_doit,
.dumpit = vdpa_nl_cmd_dev_get_dumpit,
},
+ {
+ .cmd = VDPA_CMD_DEV_CONFIG_GET,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .doit = vdpa_nl_cmd_dev_config_get_doit,
+ .dumpit = vdpa_nl_cmd_dev_config_get_dumpit,
+ },
};
static struct genl_family vdpa_nl_family __ro_after_init = {
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 66a41e4ec163..5c31ecc3b956 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -17,6 +17,7 @@ enum vdpa_command {
VDPA_CMD_DEV_NEW,
VDPA_CMD_DEV_DEL,
VDPA_CMD_DEV_GET, /* can dump */
+ VDPA_CMD_DEV_CONFIG_GET, /* can dump */
};
enum vdpa_attr {
@@ -33,6 +34,16 @@ enum vdpa_attr {
VDPA_ATTR_DEV_MAX_VQS, /* u32 */
VDPA_ATTR_DEV_MAX_VQ_SIZE, /* u16 */
+ VDPA_ATTR_DEV_NET_CFG_MACADDR, /* binary */
+ VDPA_ATTR_DEV_NET_STATUS, /* u8 */
+ VDPA_ATTR_DEV_NET_CFG_MAX_VQP, /* u16 */
+ VDPA_ATTR_DEV_NET_CFG_MTU, /* u16 */
+ VDPA_ATTR_DEV_NET_CFG_SPEED, /* u16 */
+ VDPA_ATTR_DEV_NET_CFG_DUPLEX, /* u16 */
+ VDPA_ATTR_DEV_NET_CFG_RSS_MAX_KEY_LEN, /* u8 */
+ VDPA_ATTR_DEV_NET_CFG_RSS_MAX_IT_LEN, /* u16 */
+ VDPA_ATTR_DEV_NET_CFG_RSS_HASH_TYPES, /* u32 */
+
/* new attributes must be added above here */
VDPA_ATTR_MAX,
};
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