Parav Pandit
2021-Oct-21 16:35 UTC
[PATCH linux-next v4 2/8] 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 at nvidia.com>
Signed-off-by: Eli Cohen <elic at nvidia.com>
---
changelog:
v3->v4:
- removed config space fields reporting which are not used by mlx5
and sim drivers
---
drivers/vdpa/vdpa.c | 176 ++++++++++++++++++++++++++++++++++++++
include/linux/vdpa.h | 2 +
include/uapi/linux/vdpa.h | 6 ++
3 files changed, 184 insertions(+)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 6fdfc11ecb13..a50a6aa1cfc4 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. */
@@ -58,6 +60,7 @@ static void vdpa_release_dev(struct device *d)
ops->free(vdev);
ida_simple_remove(&vdpa_index_ida, vdev->index);
+ mutex_destroy(&vdev->cf_mutex);
kfree(vdev);
}
@@ -119,6 +122,7 @@ struct vdpa_device *__vdpa_alloc_device(struct device
*parent,
if (err)
goto err_name;
+ mutex_init(&vdev->cf_mutex);
device_initialize(&vdev->dev);
return vdev;
@@ -301,6 +305,7 @@ void vdpa_get_config(struct vdpa_device *vdev, unsigned int
offset,
{
const struct vdpa_config_ops *ops = vdev->config;
+ mutex_lock(&vdev->cf_mutex);
/*
* Config accesses aren't supposed to trigger before features are set.
* If it does happen we assume a legacy guest.
@@ -308,6 +313,7 @@ void vdpa_get_config(struct vdpa_device *vdev, unsigned int
offset,
if (!vdev->features_valid)
vdpa_set_features(vdev, 0);
ops->get_config(vdev, offset, buf, len);
+ mutex_unlock(&vdev->cf_mutex);
}
EXPORT_SYMBOL_GPL(vdpa_get_config);
@@ -321,7 +327,9 @@ EXPORT_SYMBOL_GPL(vdpa_get_config);
void vdpa_set_config(struct vdpa_device *vdev, unsigned int offset,
void *buf, unsigned int length)
{
+ mutex_lock(&vdev->cf_mutex);
vdev->config->set_config(vdev, offset, buf, length);
+ mutex_unlock(&vdev->cf_mutex);
}
EXPORT_SYMBOL_GPL(vdpa_set_config);
@@ -648,6 +656,168 @@ 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, u64 features,
+ const struct virtio_net_config *config)
+{
+ u16 val_u16;
+
+ if ((features & (1ULL << VIRTIO_NET_F_MQ)) == 0)
+ return 0;
+
+ val_u16 = le16_to_cpu(config->max_virtqueue_pairs);
+ return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, val_u16);
+}
+
+static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff
*msg)
+{
+ struct virtio_net_config config = {};
+ u64 features;
+ u16 val_u16;
+
+ vdpa_get_config(vdev, 0, &config, sizeof(config));
+
+ if (nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, sizeof(config.mac),
+ config.mac))
+ return -EMSGSIZE;
+
+ val_u16 = le16_to_cpu(config.status);
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
+ return -EMSGSIZE;
+
+ val_u16 = le16_to_cpu(config.mtu);
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
+ return -EMSGSIZE;
+
+ features = vdev->config->get_features(vdev);
+
+ return vdpa_dev_net_mq_config_fill(vdev, msg, features, &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;
+ }
+ 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 },
@@ -679,6 +849,12 @@ 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/linux/vdpa.h b/include/linux/vdpa.h
index 78395331a166..9326020a2c55 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -63,6 +63,7 @@ struct vdpa_mgmt_dev;
* @dev: underlying device
* @dma_dev: the actual device that is performing DMA
* @config: the configuration ops for this device.
+ * @cf_mutex: Protects get and set access to configuration layout.
* @index: device index
* @features_valid: were features initialized? for legacy guests
* @use_va: indicate whether virtual address must be used by this device
@@ -74,6 +75,7 @@ struct vdpa_device {
struct device dev;
struct device *dma_dev;
const struct vdpa_config_ops *config;
+ struct mutex cf_mutex; /* Protects get/set config */
unsigned int index;
bool features_valid;
bool use_va;
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 66a41e4ec163..37ef30130a28 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 +34,11 @@ 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 */
+
/* new attributes must be added above here */
VDPA_ATTR_MAX,
};
--
2.25.4
Jason Wang
2021-Oct-25 06:05 UTC
[PATCH linux-next v4 2/8] vdpa: Introduce query of device config layout
? 2021/10/22 ??12:35, Parav Pandit ??:> 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 1500Nit: it looks to me this patch doesn't expose link_announce but max_virtqueue_pairs. Other looks good. Thanks> > $ 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 at nvidia.com> > Signed-off-by: Eli Cohen<elic at nvidia.com> > > --- > changelog: > v3->v4: > - removed config space fields reporting which are not used by mlx5 > and sim drivers