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Message-ID: <20240401090531.574575-2-parav@nvidia.com>
Date: Mon, 1 Apr 2024 12:05:30 +0300
From: Parav Pandit <parav@...dia.com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
<kuba@...nel.org>, <pabeni@...hat.com>, <corbet@....net>
CC: <saeedm@...dia.com>, <leon@...nel.org>, <jiri@...nulli.us>,
<shayd@...dia.com>, <danielj@...dia.com>, <dchumak@...dia.com>,
<linux-doc@...r.kernel.org>, <linux-rdma@...r.kernel.org>, Parav Pandit
<parav@...dia.com>, Jiri Pirko <jiri@...dia.com>
Subject: [net-next 1/2] devlink: Support setting max_io_eqs
Many devices send event notifications for the IO queues,
such as tx and rx queues, through event queues.
Enable a privileged owner, such as a hypervisor PF, to set the number
of IO event queues for the VF and SF during the provisioning stage.
example:
Get maximum IO event queues 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 ipsec_packet disabled max_io_eqs 10
Set maximum IO event queues of the VF device::
$ devlink port function set pci/0000:06:00.0/2 max_io_eqs 32
$ 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 ipsec_packet disabled max_io_eqs 32
Signed-off-by: Parav Pandit <parav@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
.../networking/devlink/devlink-port.rst | 25 +++++++++
include/net/devlink.h | 14 +++++
include/uapi/linux/devlink.h | 1 +
net/devlink/port.c | 52 +++++++++++++++++++
4 files changed, 92 insertions(+)
diff --git a/Documentation/networking/devlink/devlink-port.rst b/Documentation/networking/devlink/devlink-port.rst
index 562f46b41274..451f57393f11 100644
--- a/Documentation/networking/devlink/devlink-port.rst
+++ b/Documentation/networking/devlink/devlink-port.rst
@@ -134,6 +134,9 @@ Users may also set the IPsec crypto capability of the function using
Users may also set the IPsec packet capability of the function using
`devlink port function set ipsec_packet` command.
+Users may also set the maximum IO event queues of the function
+using `devlink port function set max_io_eqs` command.
+
Function attributes
===================
@@ -295,6 +298,28 @@ policy is processed in software by the kernel.
function:
hw_addr 00:00:00:00:00:00 ipsec_packet enabled
+Maximum IO events queues setup
+------------------------------
+When user sets maximum number of IO event queues for a SF or
+a VF, such function driver is limited to consume only enforced
+number of IO event queues.
+
+- Get maximum IO event queues 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 ipsec_packet disabled max_io_eqs 10
+
+- Set maximum IO event queues of the VF device::
+
+ $ devlink port function set pci/0000:06:00.0/2 max_io_eqs 32
+
+ $ 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 ipsec_packet disabled max_io_eqs 32
+
Subfunction
============
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 9ac394bdfbe4..a270e71dee0e 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1602,6 +1602,14 @@ void devlink_free(struct devlink *devlink);
* capability. Should be used by device drivers to
* enable/disable ipsec_packet capability of a
* function managed by the devlink port.
+ * @port_fn_max_io_eqs_get: Callback used to get port function's maximum number of
+ * event queues. Should be used by device drivers to
+ * report the maximum event queues of a function
+ * managed by the devlink port.
+ * @port_fn_max_io_eqs_set: Callback used to set port function's maximum number of
+ * event queues. Should be used by device drivers to
+ * configure maximum number of event queues
+ * of a function managed by the devlink port.
*
* Note: Driver should return -EOPNOTSUPP if it doesn't support
* port function (@port_fn_*) handling for a particular port.
@@ -1651,6 +1659,12 @@ struct devlink_port_ops {
int (*port_fn_ipsec_packet_set)(struct devlink_port *devlink_port,
bool enable,
struct netlink_ext_ack *extack);
+ int (*port_fn_max_io_eqs_get)(struct devlink_port *devlink_port,
+ u32 *max_eqs,
+ struct netlink_ext_ack *extack);
+ int (*port_fn_max_io_eqs_set)(struct devlink_port *devlink_port,
+ u32 max_eqs,
+ struct netlink_ext_ack *extack);
};
void devlink_port_init(struct devlink *devlink,
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 2da0c7eb6710..9401aa343673 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -686,6 +686,7 @@ enum devlink_port_function_attr {
DEVLINK_PORT_FN_ATTR_OPSTATE, /* u8 */
DEVLINK_PORT_FN_ATTR_CAPS, /* bitfield32 */
DEVLINK_PORT_FN_ATTR_DEVLINK, /* nested */
+ DEVLINK_PORT_FN_ATTR_MAX_IO_EQS, /* u32 */
__DEVLINK_PORT_FUNCTION_ATTR_MAX,
DEVLINK_PORT_FUNCTION_ATTR_MAX = __DEVLINK_PORT_FUNCTION_ATTR_MAX - 1
diff --git a/net/devlink/port.c b/net/devlink/port.c
index 118d130d2afd..307bfeedda54 100644
--- a/net/devlink/port.c
+++ b/net/devlink/port.c
@@ -16,6 +16,7 @@ static const struct nla_policy devlink_function_nl_policy[DEVLINK_PORT_FUNCTION_
DEVLINK_PORT_FN_STATE_ACTIVE),
[DEVLINK_PORT_FN_ATTR_CAPS] =
NLA_POLICY_BITFIELD32(DEVLINK_PORT_FN_CAPS_VALID_MASK),
+ [DEVLINK_PORT_FN_ATTR_MAX_IO_EQS] = { .type = NLA_U32 },
};
#define ASSERT_DEVLINK_PORT_REGISTERED(devlink_port) \
@@ -182,6 +183,30 @@ static int devlink_port_fn_caps_fill(struct devlink_port *devlink_port,
return 0;
}
+static int devlink_port_fn_max_io_eqs_fill(struct devlink_port *port,
+ struct sk_buff *msg,
+ struct netlink_ext_ack *extack,
+ bool *msg_updated)
+{
+ u32 max_io_eqs;
+ int err;
+
+ if (!port->ops->port_fn_max_io_eqs_get)
+ return 0;
+
+ err = port->ops->port_fn_max_io_eqs_get(port, &max_io_eqs, extack);
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+ err = nla_put_u32(msg, DEVLINK_PORT_FN_ATTR_MAX_IO_EQS, max_io_eqs);
+ if (err)
+ return err;
+ *msg_updated = true;
+ return 0;
+}
+
int devlink_nl_port_handle_fill(struct sk_buff *msg, struct devlink_port *devlink_port)
{
if (devlink_nl_put_handle(msg, devlink_port->devlink))
@@ -409,6 +434,18 @@ static int devlink_port_fn_caps_set(struct devlink_port *devlink_port,
return 0;
}
+static int
+devlink_port_fn_max_io_eqs_set(struct devlink_port *devlink_port,
+ const struct nlattr *attr,
+ struct netlink_ext_ack *extack)
+{
+ u32 max_io_eqs;
+
+ max_io_eqs = nla_get_u32(attr);
+ return devlink_port->ops->port_fn_max_io_eqs_set(devlink_port,
+ max_io_eqs, extack);
+}
+
static int
devlink_nl_port_function_attrs_put(struct sk_buff *msg, struct devlink_port *port,
struct netlink_ext_ack *extack)
@@ -428,6 +465,9 @@ devlink_nl_port_function_attrs_put(struct sk_buff *msg, struct devlink_port *por
if (err)
goto out;
err = devlink_port_fn_state_fill(port, msg, extack, &msg_updated);
+ if (err)
+ goto out;
+ err = devlink_port_fn_max_io_eqs_fill(port, msg, extack, &msg_updated);
if (err)
goto out;
err = devlink_rel_devlink_handle_put(msg, port->devlink,
@@ -726,6 +766,11 @@ static int devlink_port_function_validate(struct devlink_port *devlink_port,
}
}
}
+ if (tb[DEVLINK_PORT_FN_ATTR_MAX_IO_EQS] && !ops->port_fn_max_io_eqs_set) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[DEVLINK_PORT_FN_ATTR_MAX_IO_EQS],
+ "Function does not support max_io_eqs setting");
+ return -EOPNOTSUPP;
+ }
return 0;
}
@@ -761,6 +806,13 @@ static int devlink_port_function_set(struct devlink_port *port,
return err;
}
+ attr = tb[DEVLINK_PORT_FN_ATTR_MAX_IO_EQS];
+ if (attr) {
+ err = devlink_port_fn_max_io_eqs_set(port, attr, extack);
+ if (err)
+ return err;
+ }
+
/* Keep this as the last function attribute set, so that when
* multiple port function attributes are set along with state,
* Those can be applied first before activating the state.
--
2.26.2
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