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Date: Thu, 19 Jul 2012 08:42:58 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: John Fastabend <john.r.fastabend@...el.com>
Cc: or.gerlitz@...il.com, davem@...emloft.net, roland@...nel.org,
netdev@...r.kernel.org, ali@...lanox.com, sean.hefty@...el.com,
shlomop@...lanox.com
Subject: Re: [RFC PATCH] net: Add support for virtual machine device queues
(VMDQ)
Thu, Jul 19, 2012 at 12:05:44AM CEST, john.r.fastabend@...el.com wrote:
>This adds support to allow virtual net devices to be created. These
>devices can be managed independtly of the physical function but
>use the same physical link.
>
>This is analagous to an offloaded macvlan device. The primary
>advantage to VMDQ net devices over virtual functions is they can
>be added and removed dynamically as needed.
>
>Sending this for Or Gerlitz to take a peak at and see if this
>could be used for his ipoib bits. Its not pretty as is and
>likely needs some work its just an idea at this point use at
>your own risk I believe it compiles.
>---
>
> drivers/net/Kconfig | 7 ++
> drivers/net/Makefile | 1
> drivers/net/vmdq.c | 130 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/netdevice.h | 6 ++
> include/net/rtnetlink.h | 2 +
> net/core/rtnetlink.c | 10 +++
> 6 files changed, 155 insertions(+), 1 deletions(-)
> create mode 100644 drivers/net/vmdq.c
>
>diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
>index 0c2bd80..f28d951 100644
>--- a/drivers/net/Kconfig
>+++ b/drivers/net/Kconfig
>@@ -337,6 +337,13 @@ config VMXNET3
> To compile this driver as a module, choose M here: the
> module will be called vmxnet3.
>
>+config VMDQ
>+ tristate "Support Embedded bridge devices and child devices"
>+ help
>+ This supports chipsets with embedded switching components and
>+ allows us to create more net_devices that are logically slaves
>+ of a master net device.
>+
> source "drivers/net/hyperv/Kconfig"
>
> endif # NETDEVICES
>diff --git a/drivers/net/Makefile b/drivers/net/Makefile
>index 3d375ca..1eb5605 100644
>--- a/drivers/net/Makefile
>+++ b/drivers/net/Makefile
>@@ -21,6 +21,7 @@ obj-$(CONFIG_NET_TEAM) += team/
> obj-$(CONFIG_TUN) += tun.o
> obj-$(CONFIG_VETH) += veth.o
> obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
>+obj-$(CONFIG_VMDQ) += vmdq.o
>
> #
> # Networking Drivers
>diff --git a/drivers/net/vmdq.c b/drivers/net/vmdq.c
>new file mode 100644
>index 0000000..9acc429
>--- /dev/null
>+++ b/drivers/net/vmdq.c
>@@ -0,0 +1,130 @@
>+/*******************************************************************************
>+
>+ vmdq - Support virtual machine device queues (VMDQ)
>+ Copyright(c) 2012 Intel Corporation.
>+
>+ This program is free software; you can redistribute it and/or modify it
>+ under the terms and conditions of the GNU General Public License,
>+ version 2, as published by the Free Software Foundation.
>+
>+ This program is distributed in the hope it will be useful, but WITHOUT
>+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
>+ more details.
>+
>+ You should have received a copy of the GNU General Public License along with
>+ this program; if not, write to the Free Software Foundation, Inc.,
>+ 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
>+
>+ The full GNU General Public License is included in this distribution in
>+ the file called "COPYING".
>+
>+ Contact Information:
>+ John Fastabend <john.r.fastabend@...el.com>
>+
>+*******************************************************************************/
>+
>+#include <linux/module.h>
>+#include <net/rtnetlink.h>
>+#include <linux/etherdevice.h>
>+
>+static int vmdq_newlink(struct net *src_net, struct net_device *dev,
>+ struct nlattr *tb[], struct nlattr *data[])
>+{
>+ struct net_device *lowerdev;
>+ int err = -EOPNOTSUPP;
>+
>+ if (!tb[IFLA_LINK])
>+ return -EINVAL;
>+
>+ lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
>+ if (!lowerdev)
>+ return -ENODEV;
>+
>+ if (!tb[IFLA_MTU])
>+ dev->mtu = lowerdev->mtu;
>+ else if (dev->mtu > lowerdev->mtu)
>+ return -EINVAL;
>+
>+ if (lowerdev->netdev_ops->ndo_add_vmdq)
>+ err = lowerdev->netdev_ops->ndo_add_vmdq(lowerdev, dev);
>+
>+ if (err < 0)
>+ return err;
>+
>+ err = register_netdevice(dev);
>+ if (err < 0)
>+ lowerdev->netdev_ops->ndo_del_vmdq(lowerdev, dev);
>+ else
>+ netif_stacked_transfer_operstate(lowerdev, dev);
>+
>+ return err;
>+}
>+
>+void vmdq_dellink(struct net_device *dev, struct list_head *head)
>+{
>+ struct net_device *lowerdev = __dev_get_by_index(dev_net(dev), dev->iflink);
>+
>+ if (lowerdev && lowerdev->netdev_ops->ndo_del_vmdq)
>+ lowerdev->netdev_ops->ndo_del_vmdq(lowerdev, dev);
>+}
>+
>+static void vmdq_setup(struct net_device *dev)
>+{
>+ ether_setup(dev);
>+}
>+
>+size_t vmdq_getpriv_size(struct net *src_net, struct nlattr *tb[])
>+{
>+ struct net_device *lowerdev;
>+
>+ if (!tb[IFLA_LINK])
>+ return -EINVAL;
>+
>+ lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
>+ if (!lowerdev)
>+ return -ENODEV;
>+
>+ return sizeof(netdev_priv(lowerdev));
>+}
Why exactly do you need to have the priv of same size as lowerdev? I do
not see you use that anywhere...
>+
>+int vmdq_get_tx_queues(struct net *net, struct nlattr *tb[])
>+{
>+ struct net_device *lowerdev;
>+
>+ if (!tb[IFLA_LINK])
>+ return -EINVAL;
>+
>+ lowerdev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
>+ if (!lowerdev)
>+ return -ENODEV;
>+
>+ return lowerdev->num_tx_queues;
>+}
>+
>+static struct rtnl_link_ops vmdq_link_ops __read_mostly = {
>+ .kind = "vmdq",
>+ .setup = vmdq_setup,
>+ .newlink = vmdq_newlink,
>+ .dellink = vmdq_dellink,
>+ .get_priv_size = vmdq_getpriv_size,
>+ .get_tx_queues = vmdq_get_tx_queues,
>+};
>+
>+static int __init vmdq_init_module(void)
>+{
>+ return rtnl_link_register(&vmdq_link_ops);
>+}
>+
>+static void __exit vmdq_cleanup_module(void)
>+{
>+ rtnl_link_unregister(&vmdq_link_ops);
>+}
>+
>+module_init(vmdq_init_module);
>+module_exit(vmdq_cleanup_module);
>+
>+MODULE_LICENSE("GPL");
>+MODULE_AUTHOR("John Fastabend <john.r.fastabend@...el.com>");
>+MODULE_DESCRIPTION("Driver for embedded switch chipsets");
>+MODULE_ALIAS_RTNL_LINK("vmdq");
>diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>index ab0251d..d879c4d 100644
>--- a/include/linux/netdevice.h
>+++ b/include/linux/netdevice.h
>@@ -972,6 +972,12 @@ struct net_device_ops {
> struct nlattr *port[]);
> int (*ndo_get_vf_port)(struct net_device *dev,
> int vf, struct sk_buff *skb);
>+
>+ int (*ndo_add_vmdq)(struct net_device *lowerdev,
>+ struct net_device *dev);
>+ int (*ndo_del_vmdq)(struct net_device *lowerdev,
>+ struct net_device *dev);
>+
> int (*ndo_setup_tc)(struct net_device *dev, u8 tc);
> #if IS_ENABLED(CONFIG_FCOE)
> int (*ndo_fcoe_enable)(struct net_device *dev);
>diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
>index bbcfd09..e9f903c 100644
>--- a/include/net/rtnetlink.h
>+++ b/include/net/rtnetlink.h
>@@ -79,6 +79,8 @@ struct rtnl_link_ops {
> const struct net_device *dev);
> int (*get_tx_queues)(struct net *net,
> struct nlattr *tb[]);
>+ size_t (*get_priv_size)(struct net *net,
>+ struct nlattr *tb[]);
> };
>
> extern int __rtnl_link_register(struct rtnl_link_ops *ops);
>diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
>index 2b325c3..2e33b9a 100644
>--- a/net/core/rtnetlink.c
>+++ b/net/core/rtnetlink.c
>@@ -1627,6 +1627,7 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
> int err;
> struct net_device *dev;
> unsigned int num_queues = 1;
>+ size_t priv_size = ops->priv_size;
>
> if (ops->get_tx_queues) {
> err = ops->get_tx_queues(src_net, tb);
>@@ -1635,8 +1636,15 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
> num_queues = err;
> }
>
>+ if (ops->get_priv_size) {
>+ err = ops->get_priv_size(src_net, tb);
>+ if (err < 0)
>+ goto err;
>+ priv_size = err;
>+ }
>+
> err = -ENOMEM;
>- dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
>+ dev = alloc_netdev_mq(priv_size, ifname, ops->setup, num_queues);
> if (!dev)
> goto err;
>
>
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