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Message-ID: <E4CD12F19ABA0C4D8729E087A761DC3505DD315B@ORSMSX101.amr.corp.intel.com>
Date: Fri, 2 Jan 2015 11:39:08 +0000
From: "Arad, Ronen" <ronen.arad@...el.com>
To: Scott Feldman <sfeldma@...il.com>,
roopa <roopa@...ulusnetworks.com>,
Netdev <netdev@...r.kernel.org>
CC: Jirí Pírko <jiri@...nulli.us>,
john fastabend <john.fastabend@...il.com>,
Thomas Graf <tgraf@...g.ch>,
Jamal Hadi Salim <jhs@...atatu.com>,
Andy Gospodarek <andy@...yhouse.net>
Subject: RE: [PATCH net-next 1/3] net: add IPv4 routing FIB support for swdev
>-----Original Message-----
>From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] On
>Behalf Of Scott Feldman
>Sent: Friday, January 02, 2015 10:01 AM
>To: roopa
>Cc: Netdev; Jiří Pírko; john fastabend; Thomas Graf; Jamal Hadi Salim; Andy
>Gospodarek
>Subject: Re: [PATCH net-next 1/3] net: add IPv4 routing FIB support for swdev
>
>On Thu, Jan 1, 2015 at 9:49 PM, roopa <roopa@...ulusnetworks.com> wrote:
>> On 1/1/15, 7:29 PM, sfeldma@...il.com wrote:
>>>
>>> From: Scott Feldman <sfeldma@...il.com>
>>>
>>> To offload IPv4 L3 routing functions to swdev device, the swdev device
>>> driver
>>> implements two new ndo ops (ndo_switch_fib_ipv4_add/del). The ops are
>>> called
>>> by the core IPv4 FIB code when installing/removing FIB entries to/from the
>>> kernel FIB. On install, the driver should return 0 if FIB entry (route)
>>> can be
>>> installed to device for offloading, -EOPNOTSUPP if route cannot be
>>> installed
>>> due to device limitations, and other negative error code on failure to
>>> install
>>> route to device. On failure error code, the route is not installed to
>>> device,
>>> and not installed in kernel FIB, and the return code is propagated back to
>>> the
>>> user-space caller (via netlink). An -EOPNOTSUPP error code is skipped for
>>> the
>>> device but installed in the kernel FIB.
>>>
>>> The FIB entry (route) nexthop list is used to find the swdev device port
>>> to
>>> anchor the ndo op call. The route's fib_dev (the first nexthop's dev) is
>>> used
>>> find the swdev port by recursively traversing the fib_dev's lower_dev list
>>> until a swdev port is found. The ndo op is called on this swdev port.
>>
>>
>> scott, I posted a similar api for bridge attribute sets. But, nobody
>> supported it.
>> http://marc.info/?l=linux-netdev&m=141820234410602&w=2
>>
>> If this is acceptable, I will be resubmitting my api as well.
>>
>
>This may get shot down as well, who knows?
>
>For routes, the nexthop dev may be a bridge or a bond for an IP on the
>router, so we have no choice but to walk down from the bridge or the
>bond to find a swport dev to call the ndo op to install the route.
>
Another case is when VLAN-aware bridge with VLAN filtering is used. In that
case IP interfaces are VLAN interfaces created on top of the bridge.
>For bridge settings, I remember someone raised the issue that settings
>should be propagated down the dev hierarchy, with parent calling
>child's op and so on. I'll go back and look at your post.
>
This was my comment. I'm not sure it was correct. My concern was the VLAN
interface on top of a VLAN-aware bridge use-case. I now believe that such
interfaces are upper devices of the bridge (not master). Therefore, it seems
that traversal starting at a VLAN interface on top of a bridge will follow a
path: VLAN interface => bridge => [team/bond] => switchdev port.
One complication here is that the VLAN context is important. A "naked" nexthop
shall only be resolved within the VLAN associated with the VLAN interface. When
ARP resolution is performed by Linux stack, it goes via the VLAN interface
which imposes a tag on the packet before handing it to the bridge. The VLAN-
aware bridge floods such packet only to member ports of the VLAN. This behavior
of the software bridge has to be preserved with offloaded L3 forwarding and
offloaded L2 switching.
>>
>>
>>>
>>> Since the FIB entry is "naked" when push from the kernel, the
>>> driver/device
>>> is responsible for resolving the route's nexthops to neighbor MAC
>>> addresses.
>>> This can be done by the driver by monitoring NETEVENT_NEIGH_UPDATE
>>> netevent notifier to watch for ARP activity. Once a nexthop is resolved
>>> to
>>> neighbor MAC address, it can be installed to the device and the device
>>> will
>>> do the L3 routing offload in HW, for that nexthop.
>>>
>>> Signed-off-by: Scott Feldman <sfeldma@...il.com>
>>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>>> ---
>>> include/linux/netdevice.h | 22 +++++++++++
>>> include/net/switchdev.h | 18 +++++++++
>>> net/ipv4/fib_trie.c | 17 ++++++++-
>>> net/switchdev/switchdev.c | 89
>>> +++++++++++++++++++++++++++++++++++++++++++++
>>> 4 files changed, 145 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>>> index 679e6e9..b66d22b 100644
>>> --- a/include/linux/netdevice.h
>>> +++ b/include/linux/netdevice.h
>>> @@ -767,6 +767,8 @@ struct netdev_phys_item_id {
>>> typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
>>> struct sk_buff *skb);
>>> +struct fib_info;
>>> +
>>> /*
>>> * This structure defines the management hooks for network devices.
>>> * The following hooks can be defined; unless noted otherwise, they are
>>> @@ -1030,6 +1032,14 @@ typedef u16 (*select_queue_fallback_t)(struct
>>> net_device *dev,
>>> * int (*ndo_switch_port_stp_update)(struct net_device *dev, u8 state);
>>> * Called to notify switch device port of bridge port STP
>>> * state change.
>>> + * int (*ndo_sw_parent_fib_ipv4_add)(struct net_device *dev, __be32 dst,
>>> + * int dst_len, struct fib_info *fi,
>>> + * u8 tos, u8 type, u32 tb_id);
>>> + * Called to add IPv4 route to switch device.
>>> + * int (*ndo_sw_parent_fib_ipv4_del)(struct net_device *dev, __be32 dst,
>>> + * int dst_len, struct fib_info *fi,
>>> + * u8 tos, u8 type, u32 tb_id);
>>> + * Called to delete IPv4 route from switch device.
>>> */
>>> struct net_device_ops {
>>> int (*ndo_init)(struct net_device *dev);
>>> @@ -1189,6 +1199,18 @@ struct net_device_ops {
>>> struct
>>> netdev_phys_item_id *psid);
>>> int (*ndo_switch_port_stp_update)(struct
>>> net_device *dev,
>>> u8 state);
>>> + int (*ndo_switch_fib_ipv4_add)(struct
>>> net_device *dev,
>>> + __be32 dst,
>>> + int dst_len,
>>> + struct fib_info
>>> *fi,
>>> + u8 tos, u8
>>> type,
>>> + u32 tb_id);
>>> + int (*ndo_switch_fib_ipv4_del)(struct
>>> net_device *dev,
>>> + __be32 dst,
>>> + int dst_len,
>>> + struct fib_info
>>> *fi,
>>> + u8 tos, u8
>>> type,
>>> + u32 tb_id);
>>> #endif
>>> };
>>> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
>>> index 8a6d164..caebc2a 100644
>>> --- a/include/net/switchdev.h
>>> +++ b/include/net/switchdev.h
>>> @@ -17,6 +17,10 @@
>>> int netdev_switch_parent_id_get(struct net_device *dev,
>>> struct netdev_phys_item_id *psid);
>>> int netdev_switch_port_stp_update(struct net_device *dev, u8 state);
>>> +int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
>>> + u8 tos, u8 type, u32 tb_id);
>>> +int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
>>> + u8 tos, u8 type, u32 tb_id);
>>> #else
>>> @@ -32,6 +36,20 @@ static inline int
>>> netdev_switch_port_stp_update(struct net_device *dev,
>>> return -EOPNOTSUPP;
>>> }
>>> +static inline int netdev_switch_fib_ipv4_add(u32 dst, int dst_len,
>>> + struct fib_info *fi,
>>> + u8 tos, u8 type, u32 tb_id)
>>> +{
>>> + return -EOPNOTSUPP;
>>> +}
>>> +
>>> +static inline int netdev_switch_fib_ipv4_del(u32 dst, int dst_len,
>>> + struct fib_info *fi,
>>> + u8 tos, u8 type, u32 tb_id)
>>> +{
>>> + return -EOPNOTSUPP;
>>> +}
>>> +
>>> #endif
>>> #endif /* _LINUX_SWITCHDEV_H_ */
>>> diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
>>> index 281e5e0..ea2dc17 100644
>>> --- a/net/ipv4/fib_trie.c
>>> +++ b/net/ipv4/fib_trie.c
>>> @@ -79,6 +79,7 @@
>>> #include <net/tcp.h>
>>> #include <net/sock.h>
>>> #include <net/ip_fib.h>
>>> +#include <net/switchdev.h>
>>> #include "fib_lookup.h"
>>> #define MAX_STAT_DEPTH 32
>>> @@ -1201,6 +1202,8 @@ int fib_table_insert(struct fib_table *tb, struct
>>> fib_config *cfg)
>>> fib_release_info(fi_drop);
>>> if (state & FA_S_ACCESSED)
>>> rt_cache_flush(cfg->fc_nlinfo.nl_net);
>>> + netdev_switch_fib_ipv4_add(key, plen, fi,
>>> fa->fa_tos,
>>> + cfg->fc_type,
>>> tb->tb_id);
>>> rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
>>> tb->tb_id, &cfg->fc_nlinfo,
>>> NLM_F_REPLACE);
>>> @@ -1229,6 +1232,13 @@ int fib_table_insert(struct fib_table *tb, struct
>>> fib_config *cfg)
>>> new_fa->fa_tos = tos;
>>> new_fa->fa_type = cfg->fc_type;
>>> new_fa->fa_state = 0;
>>> +
>>> + /* (Optionally) offload fib info to switch hardware. */
>>> + err = netdev_switch_fib_ipv4_add(key, plen, fi, tos,
>>> + cfg->fc_type, tb->tb_id);
>>> + if (err && err != -EOPNOTSUPP)
>>> + goto out_free_new_fa;
>>> +
>>> /*
>>> * Insert new entry to the list.
>>> */
>>> @@ -1237,7 +1247,7 @@ int fib_table_insert(struct fib_table *tb, struct
>>> fib_config *cfg)
>>> fa_head = fib_insert_node(t, key, plen);
>>> if (unlikely(!fa_head)) {
>>> err = -ENOMEM;
>>> - goto out_free_new_fa;
>>> + goto out_sw_fib_del;
>>> }
>>> }
>>> @@ -1253,6 +1263,8 @@ int fib_table_insert(struct fib_table *tb, struct
>>> fib_config *cfg)
>>> succeeded:
>>> return 0;
>>> +out_sw_fib_del:
>>> + netdev_switch_fib_ipv4_del(key, plen, fi, tos, cfg->fc_type,
>>> tb->tb_id);
>>> out_free_new_fa:
>>> kmem_cache_free(fn_alias_kmem, new_fa);
>>> out:
>>> @@ -1529,6 +1541,9 @@ int fib_table_delete(struct fib_table *tb, struct
>>> fib_config *cfg)
>>> rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id,
>>> &cfg->fc_nlinfo, 0);
>>> + netdev_switch_fib_ipv4_del(key, plen, fa->fa_info, tos,
>>> + cfg->fc_type, tb->tb_id);
>>> +
>>> list_del_rcu(&fa->fa_list);
>>> if (!plen)
>>> diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
>>> index d162b21..211a8a0 100644
>>> --- a/net/switchdev/switchdev.c
>>> +++ b/net/switchdev/switchdev.c
>>> @@ -12,6 +12,7 @@
>>> #include <linux/types.h>
>>> #include <linux/init.h>
>>> #include <linux/netdevice.h>
>>> +#include <net/ip_fib.h>
>>> #include <net/switchdev.h>
>>> /**
>>> @@ -50,3 +51,91 @@ int netdev_switch_port_stp_update(struct net_device
>>> *dev, u8 state)
>>> return ops->ndo_switch_port_stp_update(dev, state);
>>> }
>>> EXPORT_SYMBOL(netdev_switch_port_stp_update);
>>> +
>>> +static struct net_device *netdev_switch_get_by_fib_dev(struct net_device
>>> *dev)
>>> +{
>>> + const struct net_device_ops *ops = dev->netdev_ops;
>>> + struct net_device *lower_dev;
>>> + struct net_device *port_dev;
>>> + struct list_head *iter;
>>> +
>>> + /* Recusively search from fib_dev down until we find
>>> + * a sw port dev. (A sw port dev supports
>>> + * ndo_switch_parent_id_get).
>>> + */
>>> +
>>> + if (ops->ndo_switch_parent_id_get)
>>> + return dev;
>>> +
>>> + netdev_for_each_lower_dev(dev, lower_dev, iter) {
>>> + port_dev = netdev_switch_get_by_fib_dev(lower_dev);
>>> + if (port_dev)
>>> + return port_dev;
>>> + }
>>> +
>>> + return NULL;
>>> +}
>>> +
>>> +/**
>>> + * netdev_switch_fib_ipv4_add - Add IPv4 route entry to switch
>>> + *
>>> + * @dst: route's IPv4 destination address
>>> + * @dst_len: destination address length (prefix length)
>>> + * @fi: route FIB info structure
>>> + * @tos: route TOS
>>> + * @type: route type
>>> + * @tb_id: route table ID
>>> + *
>>> + * Add IPv4 route entry to switch device.
>>> + */
>>> +int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
>>> + u8 tos, u8 type, u32 tb_id)
>>> +{
>>> + struct net_device *dev;
>>> + const struct net_device_ops *ops;
>>> + int err = -EOPNOTSUPP;
>>> +
>>> + dev = netdev_switch_get_by_fib_dev(fi->fib_dev);
>>> + if (!dev)
>>> + return -EOPNOTSUPP;
>>> + ops = dev->netdev_ops;
>>> +
>>> + if (ops->ndo_switch_fib_ipv4_add)
>>> + err = ops->ndo_switch_fib_ipv4_add(dev, htonl(dst),
>>> dst_len,
>>> + fi, tos, type, tb_id);
>>> +
>>> + return err;
>>> +}
>>> +EXPORT_SYMBOL(netdev_switch_fib_ipv4_add);
>>> +
>>> +/**
>>> + * netdev_switch_fib_ipv4_del - Delete IPv4 route entry from switch
>>> + *
>>> + * @dst: route's IPv4 destination address
>>> + * @dst_len: destination address length (prefix length)
>>> + * @fi: route FIB info structure
>>> + * @tos: route TOS
>>> + * @type: route type
>>> + * @tb_id: route table ID
>>> + *
>>> + * Delete IPv4 route entry from switch device.
>>> + */
>>> +int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
>>> + u8 tos, u8 type, u32 tb_id)
>>> +{
>>> + struct net_device *dev;
>>> + const struct net_device_ops *ops;
>>> + int err = -EOPNOTSUPP;
>>> +
>>> + dev = netdev_switch_get_by_fib_dev(fi->fib_dev);
>>> + if (!dev)
>>> + return -EOPNOTSUPP;
>>> + ops = dev->netdev_ops;
>>> +
>>> + if (ops->ndo_switch_fib_ipv4_del)
>>> + err = ops->ndo_switch_fib_ipv4_del(dev, htonl(dst),
>>> dst_len,
>>> + fi, tos, type, tb_id);
>>> +
>>> + return err;
>>> +}
>>> +EXPORT_SYMBOL(netdev_switch_fib_ipv4_del);
>>
>>
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