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-rw-r--r--Documentation/networking/devlink/devlink-port.rst46
-rw-r--r--include/net/devlink.h21
-rw-r--r--include/uapi/linux/devlink.h3
-rw-r--r--net/core/devlink.c55
4 files changed, 125 insertions, 0 deletions
diff --git a/Documentation/networking/devlink/devlink-port.rst b/Documentation/networking/devlink/devlink-port.rst
index c3302d23e480..3da590953ce8 100644
--- a/Documentation/networking/devlink/devlink-port.rst
+++ b/Documentation/networking/devlink/devlink-port.rst
@@ -125,6 +125,9 @@ this means a MAC address.
Users may also set the RoCE capability of the function using
`devlink port function set roce` command.
+Users may also set the function as migratable using
+'devlink port function set migratable' command.
+
Function attributes
===================
@@ -194,6 +197,49 @@ VF/SF driver cannot override it.
function:
hw_addr 00:00:00:00:00:00 roce disable
+migratable capability setup
+---------------------------
+Live migration is the process of transferring a live virtual machine
+from one physical host to another without disrupting its normal
+operation.
+
+User who want PCI VFs to be able to perform live migration need to
+explicitly enable the VF migratable capability.
+
+When user enables migratable capability for a VF, and the HV binds the VF to VFIO driver
+with migration support, the user can migrate the VM with this VF from one HV to a
+different one.
+
+However, when migratable capability is enable, device will disable features which cannot
+be migrated. Thus migratable cap can impose limitations on a VF so let the user decide.
+
+Example of LM with migratable function configuration:
+- Get migratable capability of the VF device::
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:00:00:00:00:00 migratable disable
+
+- Set migratable capability of the VF device::
+
+ $ devlink port function set pci/0000:06:00.0/2 migratable enable
+
+ $ devlink port show pci/0000:06:00.0/2
+ pci/0000:06:00.0/2: type eth netdev enp6s0pf0vf1 flavour pcivf pfnum 0 vfnum 1
+ function:
+ hw_addr 00:00:00:00:00:00 migratable enable
+
+- Bind VF to VFIO driver with migration support::
+
+ $ echo <pci_id> > /sys/bus/pci/devices/0000:08:00.0/driver/unbind
+ $ echo mlx5_vfio_pci > /sys/bus/pci/devices/0000:08:00.0/driver_override
+ $ echo <pci_id> > /sys/bus/pci/devices/0000:08:00.0/driver/bind
+
+Attach VF to the VM.
+Start the VM.
+Perform live migration.
+
Subfunction
============
diff --git a/include/net/devlink.h b/include/net/devlink.h
index ce4c65d2f2e7..0f376a28b9c4 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1470,6 +1470,27 @@ struct devlink_ops {
int (*port_fn_roce_set)(struct devlink_port *devlink_port,
bool enable, struct netlink_ext_ack *extack);
/**
+ * @port_fn_migratable_get: Port function's migratable get function.
+ *
+ * Query migratable state of a function managed by the devlink port.
+ * Return -EOPNOTSUPP if port function migratable handling is not
+ * supported.
+ */
+ int (*port_fn_migratable_get)(struct devlink_port *devlink_port,
+ bool *is_enable,
+ struct netlink_ext_ack *extack);
+ /**
+ * @port_fn_migratable_set: Port function's migratable set function.
+ *
+ * Enable/Disable migratable state of a function managed by the devlink
+ * port.
+ * Return -EOPNOTSUPP if port function migratable handling is not
+ * supported.
+ */
+ int (*port_fn_migratable_set)(struct devlink_port *devlink_port,
+ bool enable,
+ struct netlink_ext_ack *extack);
+ /**
* port_new() - Add a new port function of a specified flavor
* @devlink: Devlink instance
* @attrs: attributes of the new port
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 6cc2925bd478..3782d4219ac9 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -660,12 +660,15 @@ enum devlink_resource_unit {
enum devlink_port_fn_attr_cap {
DEVLINK_PORT_FN_ATTR_CAP_ROCE_BIT,
+ DEVLINK_PORT_FN_ATTR_CAP_MIGRATABLE_BIT,
/* Add new caps above */
__DEVLINK_PORT_FN_ATTR_CAPS_MAX,
};
#define DEVLINK_PORT_FN_CAP_ROCE _BITUL(DEVLINK_PORT_FN_ATTR_CAP_ROCE_BIT)
+#define DEVLINK_PORT_FN_CAP_MIGRATABLE \
+ _BITUL(DEVLINK_PORT_FN_ATTR_CAP_MIGRATABLE_BIT)
enum devlink_port_function_attr {
DEVLINK_PORT_FUNCTION_ATTR_UNSPEC,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 8c0ad52431c5..ab40ebcb4aea 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -715,6 +715,29 @@ static int devlink_port_fn_roce_fill(const struct devlink_ops *ops,
return 0;
}
+static int devlink_port_fn_migratable_fill(const struct devlink_ops *ops,
+ struct devlink_port *devlink_port,
+ struct nla_bitfield32 *caps,
+ struct netlink_ext_ack *extack)
+{
+ bool is_enable;
+ int err;
+
+ if (!ops->port_fn_migratable_get ||
+ devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF)
+ return 0;
+
+ err = ops->port_fn_migratable_get(devlink_port, &is_enable, extack);
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ devlink_port_fn_cap_fill(caps, DEVLINK_PORT_FN_CAP_MIGRATABLE, is_enable);
+ return 0;
+}
+
static int devlink_port_fn_caps_fill(const struct devlink_ops *ops,
struct devlink_port *devlink_port,
struct sk_buff *msg,
@@ -728,6 +751,10 @@ static int devlink_port_fn_caps_fill(const struct devlink_ops *ops,
if (err)
return err;
+ err = devlink_port_fn_migratable_fill(ops, devlink_port, &caps, extack);
+ if (err)
+ return err;
+
if (!caps.selector)
return 0;
err = nla_put_bitfield32(msg, DEVLINK_PORT_FN_ATTR_CAPS, caps.value,
@@ -1323,6 +1350,15 @@ static int devlink_port_fn_state_fill(const struct devlink_ops *ops,
}
static int
+devlink_port_fn_mig_set(struct devlink_port *devlink_port, bool enable,
+ struct netlink_ext_ack *extack)
+{
+ const struct devlink_ops *ops = devlink_port->devlink->ops;
+
+ return ops->port_fn_migratable_set(devlink_port, enable, extack);
+}
+
+static int
devlink_port_fn_roce_set(struct devlink_port *devlink_port, bool enable,
struct netlink_ext_ack *extack)
{
@@ -1348,6 +1384,13 @@ static int devlink_port_fn_caps_set(struct devlink_port *devlink_port,
if (err)
return err;
}
+ if (caps.selector & DEVLINK_PORT_FN_CAP_MIGRATABLE) {
+ err = devlink_port_fn_mig_set(devlink_port, caps_value &
+ DEVLINK_PORT_FN_CAP_MIGRATABLE,
+ extack);
+ if (err)
+ return err;
+ }
return 0;
}
@@ -1769,6 +1812,18 @@ static int devlink_port_function_validate(struct devlink_port *devlink_port,
"Port doesn't support RoCE function attribute");
return -EOPNOTSUPP;
}
+ if (caps.selector & DEVLINK_PORT_FN_CAP_MIGRATABLE) {
+ if (!ops->port_fn_migratable_set) {
+ NL_SET_ERR_MSG_ATTR(extack, attr,
+ "Port doesn't support migratable function attribute");
+ return -EOPNOTSUPP;
+ }
+ if (devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF) {
+ NL_SET_ERR_MSG_ATTR(extack, attr,
+ "migratable function attribute supported for VFs only");
+ return -EOPNOTSUPP;
+ }
+ }
}
return 0;
}
generated by cgit (git 2.34.1) at 2026-01-02 14:27:13 +0000