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Date: Fri, 3 Apr 2015 17:20:53 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: "John W. Linville" <linville@...driver.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
Jesse Gross <jesse@...ira.com>, Andy Zhou <azhou@...ira.com>,
Stephen Hemminger <stephen@...workplumber.org>,
Alexander Duyck <alexander.h.duyck@...hat.com>
Subject: Re: [RFC PATCH 5/5] geneve: add initial netdev driver for GENEVE
tunnels
Fri, Apr 03, 2015 at 05:07:44PM CEST, linville@...driver.com wrote:
>On Fri, Apr 03, 2015 at 10:57:12AM -0400, John W. Linville wrote:
>> On Thu, Apr 02, 2015 at 10:20:02PM +0200, Jiri Pirko wrote:
>> > Thu, Apr 02, 2015 at 09:17:06PM CEST, linville@...driver.com wrote:
>> > >This is an initial implementation of a netdev driver for GENEVE
>> > >tunnels. This implementation uses a fixed UDP port, and only supports
>> > >a single tunnel (and therefore only a single VNI) per net namespace.
>> > >Only IPv4 links are supported at this time.
>> >
>> >
>> > Thanks for doing this John!
>> >
>> >
>> > >
>> > >Signed-off-by: John W. Linville <linville@...driver.com>
>> > >---
>> > > drivers/net/Kconfig | 14 ++
>> > > drivers/net/Makefile | 1 +
>> > > drivers/net/geneve.c | 451 +++++++++++++++++++++++++++++++++++++++++++
>> > > include/uapi/linux/if_link.h | 9 +
>> > > 4 files changed, 475 insertions(+)
>> > > create mode 100644 drivers/net/geneve.c
>> > >
>> >
>> > ...
>> >
>> > >+/* Initialize the device structure. */
>> > >+static void geneve_setup(struct net_device *dev)
>> > >+{
>> > >+ struct geneve_dev *geneve = netdev_priv(dev);
>> > >+
>> > >+ ether_setup(dev);
>> > >+
>> > >+ dev->netdev_ops = &geneve_netdev_ops;
>> > >+ dev->destructor = free_netdev;
>> > >+ SET_NETDEV_DEVTYPE(dev, &geneve_type);
>> > >+
>> > >+ INIT_WORK(&geneve->sock_work, geneve_sock_work);
>> >
>> > I would push work initialization into geneve_newlink. Seems odd to have
>> > it here in setup.
>>
>> Yes, that will probably work a lot better for multiple tunnels on a
>> host... :-)
>
>Ignore that comment -- I was thinking...something else...need coffee... ;-)
>
>What makes newlink better for INIT_WORK than setup?
Can be here for sure. I just thought that setup should setup netdev
according to type. This is not it. This initializes a part of priv
structure.
>
>>
>> > >+
>> > >+ dev->tx_queue_len = 0;
>> > >+ dev->features = 0;
>> > >+
>> > >+ dev->vlan_features = dev->features;
>> > >+ dev->hw_features = 0;
>> > >+
>> > >+ geneve->dev = dev;
>> > >+}
>> > >+
>> > >+static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
>> > >+ [IFLA_GENEVE_ID] = { .type = NLA_U32 },
>> > >+ [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
>> > >+};
>> > >+
>> > >+static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
>> > >+{
>> > >+ if (tb[IFLA_ADDRESS]) {
>> > >+ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
>> > >+ return -EINVAL;
>> > >+
>> > >+ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
>> > >+ return -EADDRNOTAVAIL;
>> > >+ }
>> > >+
>> > >+ if (!data)
>> > >+ return -EINVAL;
>> > >+
>> > >+ if (data[IFLA_GENEVE_ID]) {
>> > >+ __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
>> >
>> > missing newline
>>
>> Sure.
>>
>> > >+ if (vni >= GENEVE_VID_MASK)
>> > >+ return -ERANGE;
>> > >+ }
>> > >+
>> > >+ return 0;
>> > >+}
>> > >+
>> > >+static void geneve_get_drvinfo(struct net_device *dev,
>> > >+ struct ethtool_drvinfo *drvinfo)
>> > >+{
>> > >+ strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
>> > >+ strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
>> > >+}
>> > >+
>> > >+static const struct ethtool_ops geneve_ethtool_ops = {
>> > >+ .get_drvinfo = geneve_get_drvinfo,
>> > >+ .get_link = ethtool_op_get_link,
>> > >+};
>> > >+
>> > >+static int geneve_newlink(struct net *net, struct net_device *dev,
>> > >+ struct nlattr *tb[], struct nlattr *data[])
>> > >+{
>> > >+ struct geneve_net *gn = net_generic(net, geneve_net_id);
>> > >+ struct geneve_dev *geneve = netdev_priv(dev);
>> > >+ __u32 vni;
>> >
>> > why not "u32" ?
>>
>> I think I copied that from vxlan.c. In fact, I'm not really sure I
>> understand why both exist?
>>
>> > >+ int err;
>> > >+
>> > >+ /* TODO: need to support multiple tunnels in a namespace */
>> > >+ if (!list_empty(&gn->geneve_list))
>> > >+ return -EBUSY;
>> >
>> > Interesting limitation :)
>>
>> That should disappear, of course. :-)
>>
>> > ...
>> >
>> > >+static void __net_exit geneve_exit_net(struct net *net)
>> > >+{
>> > >+ struct geneve_net *gn = net_generic(net, geneve_net_id);
>> > >+ struct geneve_dev *geneve, *next;
>> > >+ struct net_device *dev, *aux;
>> > >+ LIST_HEAD(list);
>> > >+
>> > >+ rtnl_lock();
>> > >+ for_each_netdev_safe(net, dev, aux)
>> > >+ if (dev->rtnl_link_ops == &geneve_link_ops)
>> > >+ unregister_netdevice_queue(dev, &list);
>> > >+
>> > >+ list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
>> > >+ /* If geneve->dev is in the same netns, it was already added
>> > >+ * to the list by the previous loop.
>> > >+ */
>> > >+ if (!net_eq(dev_net(geneve->dev), net))
>> > >+ unregister_netdevice_queue(dev, &list);
>> > >+ }
>> >
>> > I know this is c&p of vxlan, but I do not understand why the first loop
>> > is there. The second loop will take care of all since all devs are
>> > listed in ->geneve_list, right?
>> >
>> > Also you do not need _safe variant since you traverse through
>> > ->geneve_list, which is not modified.
>>
>> Yes, it is boilerplate from vxlan. Maybe Stephen can explain it?
>>
>> Maybe it relates to the the ordering of the unregister queue?
>> I'll try to figure it out...
>>
>> > >+
>> > >+ unregister_netdevice_many(&list);
>> > >+ rtnl_unlock();
>> > >+}
>>
>> Thanks for the review and suggestions!
>>
>> John
>>
>> --
>> John W. Linville Someday the world will need a hero, and you
>> linville@...driver.com might be all we have. Be ready.
>> --
>> To unsubscribe from this list: send the line "unsubscribe netdev" in
>> the body of a message to majordomo@...r.kernel.org
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>>
>
>--
>John W. Linville Someday the world will need a hero, and you
>linville@...driver.com might be all we have. Be ready.
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