vdpa: Introduce query of device config layout
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
$ 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@nvidia.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20211026175519.87795-3-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Parav Pandit
Michael S. Tsirkin
parent
6dbb1f1687
commit
ad69dd0bf2
@ -14,6 +14,8 @@
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#include <uapi/linux/vdpa.h>
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#include <net/genetlink.h>
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#include <linux/mod_devicetable.h>
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#include <linux/virtio_net.h>
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#include <linux/virtio_ids.h>
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static LIST_HEAD(mdev_head);
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/* A global mutex that protects vdpa management device and device level operations. */
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@ -66,6 +68,7 @@ static void vdpa_release_dev(struct device *d)
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ops->free(vdev);
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ida_simple_remove(&vdpa_index_ida, vdev->index);
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mutex_destroy(&vdev->cf_mutex);
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kfree(vdev);
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}
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@ -127,6 +130,7 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
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if (err)
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goto err_name;
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mutex_init(&vdev->cf_mutex);
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device_initialize(&vdev->dev);
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return vdev;
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@ -309,6 +313,7 @@ void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
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{
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const struct vdpa_config_ops *ops = vdev->config;
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mutex_lock(&vdev->cf_mutex);
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/*
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* Config accesses aren't supposed to trigger before features are set.
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* If it does happen we assume a legacy guest.
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@ -316,6 +321,7 @@ void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
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if (!vdev->features_valid)
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vdpa_set_features(vdev, 0);
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ops->get_config(vdev, offset, buf, len);
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mutex_unlock(&vdev->cf_mutex);
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}
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EXPORT_SYMBOL_GPL(vdpa_get_config);
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@ -329,7 +335,9 @@ EXPORT_SYMBOL_GPL(vdpa_get_config);
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void vdpa_set_config(struct vdpa_device *vdev, unsigned int offset,
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const void *buf, unsigned int length)
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{
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mutex_lock(&vdev->cf_mutex);
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vdev->config->set_config(vdev, offset, buf, length);
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mutex_unlock(&vdev->cf_mutex);
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}
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EXPORT_SYMBOL_GPL(vdpa_set_config);
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@ -661,6 +669,168 @@ static int vdpa_nl_cmd_dev_get_dumpit(struct sk_buff *msg, struct netlink_callba
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return msg->len;
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}
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static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
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struct sk_buff *msg, u64 features,
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const struct virtio_net_config *config)
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{
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u16 val_u16;
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if ((features & (1ULL << VIRTIO_NET_F_MQ)) == 0)
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return 0;
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val_u16 = le16_to_cpu(config->max_virtqueue_pairs);
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return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, val_u16);
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}
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static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
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{
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struct virtio_net_config config = {};
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u64 features;
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u16 val_u16;
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vdpa_get_config(vdev, 0, &config, sizeof(config));
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if (nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, sizeof(config.mac),
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config.mac))
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return -EMSGSIZE;
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val_u16 = le16_to_cpu(config.status);
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if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
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return -EMSGSIZE;
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val_u16 = le16_to_cpu(config.mtu);
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if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
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return -EMSGSIZE;
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features = vdev->config->get_features(vdev);
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return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config);
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}
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static int
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vdpa_dev_config_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq,
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int flags, struct netlink_ext_ack *extack)
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{
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u32 device_id;
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void *hdr;
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int err;
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hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags,
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VDPA_CMD_DEV_CONFIG_GET);
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if (!hdr)
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return -EMSGSIZE;
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if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) {
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err = -EMSGSIZE;
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goto msg_err;
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}
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device_id = vdev->config->get_device_id(vdev);
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if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id)) {
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err = -EMSGSIZE;
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goto msg_err;
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}
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switch (device_id) {
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case VIRTIO_ID_NET:
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err = vdpa_dev_net_config_fill(vdev, msg);
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break;
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default:
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err = -EOPNOTSUPP;
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break;
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}
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if (err)
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goto msg_err;
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genlmsg_end(msg, hdr);
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return 0;
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msg_err:
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genlmsg_cancel(msg, hdr);
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return err;
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}
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static int vdpa_nl_cmd_dev_config_get_doit(struct sk_buff *skb, struct genl_info *info)
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{
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struct vdpa_device *vdev;
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struct sk_buff *msg;
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const char *devname;
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struct device *dev;
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int err;
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if (!info->attrs[VDPA_ATTR_DEV_NAME])
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return -EINVAL;
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devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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mutex_lock(&vdpa_dev_mutex);
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dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match);
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if (!dev) {
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NL_SET_ERR_MSG_MOD(info->extack, "device not found");
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err = -ENODEV;
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goto dev_err;
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}
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vdev = container_of(dev, struct vdpa_device, dev);
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if (!vdev->mdev) {
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NL_SET_ERR_MSG_MOD(info->extack, "unmanaged vdpa device");
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err = -EINVAL;
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goto mdev_err;
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}
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err = vdpa_dev_config_fill(vdev, msg, info->snd_portid, info->snd_seq,
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0, info->extack);
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if (!err)
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err = genlmsg_reply(msg, info);
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mdev_err:
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put_device(dev);
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dev_err:
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mutex_unlock(&vdpa_dev_mutex);
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if (err)
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nlmsg_free(msg);
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return err;
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}
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static int vdpa_dev_config_dump(struct device *dev, void *data)
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{
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struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
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struct vdpa_dev_dump_info *info = data;
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int err;
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if (!vdev->mdev)
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return 0;
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if (info->idx < info->start_idx) {
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info->idx++;
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return 0;
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}
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err = vdpa_dev_config_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid,
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info->cb->nlh->nlmsg_seq, NLM_F_MULTI,
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info->cb->extack);
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if (err)
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return err;
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info->idx++;
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return 0;
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}
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static int
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vdpa_nl_cmd_dev_config_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
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{
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struct vdpa_dev_dump_info info;
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info.msg = msg;
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info.cb = cb;
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info.start_idx = cb->args[0];
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info.idx = 0;
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mutex_lock(&vdpa_dev_mutex);
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bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_config_dump);
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mutex_unlock(&vdpa_dev_mutex);
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cb->args[0] = info.idx;
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return msg->len;
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}
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static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = {
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[VDPA_ATTR_MGMTDEV_BUS_NAME] = { .type = NLA_NUL_STRING },
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[VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING },
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@ -692,6 +862,12 @@ static const struct genl_ops vdpa_nl_ops[] = {
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.doit = vdpa_nl_cmd_dev_get_doit,
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.dumpit = vdpa_nl_cmd_dev_get_dumpit,
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},
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{
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.cmd = VDPA_CMD_DEV_CONFIG_GET,
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.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
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.doit = vdpa_nl_cmd_dev_config_get_doit,
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.dumpit = vdpa_nl_cmd_dev_config_get_dumpit,
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},
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};
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static struct genl_family vdpa_nl_family __ro_after_init = {
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@ -63,6 +63,7 @@ struct vdpa_mgmt_dev;
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* @dev: underlying device
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* @dma_dev: the actual device that is performing DMA
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* @config: the configuration ops for this device.
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* @cf_mutex: Protects get and set access to configuration layout.
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* @index: device index
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* @features_valid: were features initialized? for legacy guests
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* @use_va: indicate whether virtual address must be used by this device
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@ -74,6 +75,7 @@ struct vdpa_device {
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struct device dev;
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struct device *dma_dev;
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const struct vdpa_config_ops *config;
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struct mutex cf_mutex; /* Protects get/set config */
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unsigned int index;
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bool features_valid;
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bool use_va;
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@ -17,6 +17,7 @@ enum vdpa_command {
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VDPA_CMD_DEV_NEW,
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VDPA_CMD_DEV_DEL,
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VDPA_CMD_DEV_GET, /* can dump */
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VDPA_CMD_DEV_CONFIG_GET, /* can dump */
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};
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enum vdpa_attr {
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@ -34,6 +35,11 @@ enum vdpa_attr {
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VDPA_ATTR_DEV_MAX_VQ_SIZE, /* u16 */
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VDPA_ATTR_DEV_MIN_VQ_SIZE, /* u16 */
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VDPA_ATTR_DEV_NET_CFG_MACADDR, /* binary */
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VDPA_ATTR_DEV_NET_STATUS, /* u8 */
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VDPA_ATTR_DEV_NET_CFG_MAX_VQP, /* u16 */
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VDPA_ATTR_DEV_NET_CFG_MTU, /* u16 */
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/* new attributes must be added above here */
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VDPA_ATTR_MAX,
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};
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