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bridge: switchdev: Add forward mark support for stacked devices

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switchdev_port_fwd_mark_set() is used to set the 'offload_fwd_mark' of
port netdevs so that packets being flooded by the device won't be
flooded twice.

It works by assigning a unique identifier (the ifindex of the first
bridge port) to bridge ports sharing the same parent ID. This prevents
packets from being flooded twice by the same switch, but will flood
packets through bridge ports belonging to a different switch.

This method is problematic when stacked devices are taken into account,
such as VLANs. In such cases, a physical port netdev can have upper
devices being members in two different bridges, thus requiring two
different 'offload_fwd_mark's to be configured on the port netdev, which
is impossible.

The main problem is that packet and netdev marking is performed at the
physical netdev level, whereas flooding occurs between bridge ports,
which are not necessarily port netdevs.

Instead, packet and netdev marking should really be done in the bridge
driver with the switch driver only telling it which packets it already
forwarded. The bridge driver will mark such packets using the mark
assigned to the ingress bridge port and will prevent the packet from
being forwarded through any bridge port sharing the same mark (i.e.
having the same parent ID).

Remove the current switchdev 'offload_fwd_mark' implementation and
instead implement the proposed method. In addition, make rocker - the
sole user of the mark - use the proposed method.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2016-08-25 18:42:37 +02:00 committed by David S. Miller
parent 5c326ab49e
commit 6bc506b4fb
14 changed files with 117 additions and 132 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
Documentation/networking/switchdev.txt
View File

@ -283,15 +283,10 @@ be sent to the port netdev for processing by the bridge driver. The
bridge should not reflood the packet to the same ports the device flooded,
otherwise there will be duplicate packets on the wire.
To avoid duplicate packets, the device/driver should mark a packet as already
forwarded using skb->offload_fwd_mark. The same mark is set on the device
ports in the domain using dev->offload_fwd_mark. If the skb->offload_fwd_mark
is non-zero and matches the forwarding egress port's dev->skb_mark, the kernel
will drop the skb right before transmit on the egress port, with the
understanding that the device already forwarded the packet on same egress port.
The driver can use switchdev_port_fwd_mark_set() to set a globally unique mark
for port's dev->offload_fwd_mark, based on the port's parent ID (switch ID) and
a group ifindex.
To avoid duplicate packets, the switch driver should mark a packet as already
forwarded by setting the skb->offload_fwd_mark bit. The bridge driver will mark
the skb using the ingress bridge port's mark and prevent it from being forwarded
through any bridge port with the same mark.
It is possible for the switch device to not handle flooding and push the
packets up to the bridge driver for flooding. This is not ideal as the number

2
drivers/net/ethernet/rocker/rocker_main.c
View File

@ -2412,7 +2412,7 @@ static int rocker_port_rx_proc(const struct rocker *rocker,
skb->protocol = eth_type_trans(skb, rocker_port->dev);
if (rx_flags & ROCKER_RX_FLAGS_FWD_OFFLOAD)
skb->offload_fwd_mark = rocker_port->dev->offload_fwd_mark;
skb->offload_fwd_mark = 1;
rocker_port->dev->stats.rx_packets++;
rocker_port->dev->stats.rx_bytes += skb->len;

4
drivers/net/ethernet/rocker/rocker_ofdpa.c
View File

@ -2558,7 +2558,6 @@ static int ofdpa_port_init(struct rocker_port *rocker_port)
struct ofdpa_port *ofdpa_port = rocker_port->wpriv;
int err;
switchdev_port_fwd_mark_set(ofdpa_port->dev, NULL, false);
rocker_port_set_learning(rocker_port,
!!(ofdpa_port->brport_flags & BR_LEARNING));
@ -2817,7 +2816,6 @@ static int ofdpa_port_bridge_join(struct ofdpa_port *ofdpa_port,
ofdpa_port_internal_vlan_id_get(ofdpa_port, bridge->ifindex);
ofdpa_port->bridge_dev = bridge;
switchdev_port_fwd_mark_set(ofdpa_port->dev, bridge, true);
return ofdpa_port_vlan_add(ofdpa_port, NULL, OFDPA_UNTAGGED_VID, 0);
}
@ -2836,8 +2834,6 @@ static int ofdpa_port_bridge_leave(struct ofdpa_port *ofdpa_port)
ofdpa_port_internal_vlan_id_get(ofdpa_port,
ofdpa_port->dev->ifindex);
switchdev_port_fwd_mark_set(ofdpa_port->dev, ofdpa_port->bridge_dev,
false);
ofdpa_port->bridge_dev = NULL;
err = ofdpa_port_vlan_add(ofdpa_port, NULL, OFDPA_UNTAGGED_VID, 0);

5
include/linux/netdevice.h
View File

@ -1562,8 +1562,6 @@ enum netdev_priv_flags {
*
* @xps_maps: XXX: need comments on this one
*
* @offload_fwd_mark: Offload device fwding mark
*
* @watchdog_timeo: Represents the timeout that is used by
* the watchdog (see dev_watchdog())
* @watchdog_timer: List of timers
@ -1814,9 +1812,6 @@ struct net_device {
#ifdef CONFIG_NET_CLS_ACT
struct tcf_proto __rcu *egress_cl_list;
#endif
#ifdef CONFIG_NET_SWITCHDEV
u32 offload_fwd_mark;
#endif
/* These may be needed for future network-power-down code. */
struct timer_list watchdog_timer;

13
include/linux/skbuff.h
View File

@ -612,7 +612,6 @@ static inline bool skb_mstamp_after(const struct skb_mstamp *t1,
* @no_fcs: Request NIC to treat last 4 bytes as Ethernet FCS
* @napi_id: id of the NAPI struct this skb came from
* @secmark: security marking
* @offload_fwd_mark: fwding offload mark
* @mark: Generic packet mark
* @vlan_proto: vlan encapsulation protocol
* @vlan_tci: vlan tag control information
@ -730,7 +729,10 @@ struct sk_buff {
__u8 ipvs_property:1;
__u8 inner_protocol_type:1;
__u8 remcsum_offload:1;
/* 3 or 5 bit hole */
#ifdef CONFIG_NET_SWITCHDEV
__u8 offload_fwd_mark:1;
#endif
/* 2, 4 or 5 bit hole */
#ifdef CONFIG_NET_SCHED
__u16 tc_index; /* traffic control index */
@ -757,14 +759,9 @@ struct sk_buff {
unsigned int sender_cpu;
};
#endif
union {
#ifdef CONFIG_NETWORK_SECMARK
__u32 secmark;
__u32 secmark;
#endif
#ifdef CONFIG_NET_SWITCHDEV
__u32 offload_fwd_mark;
#endif
};
union {
__u32 mark;

6
include/net/switchdev.h
View File

@ -347,12 +347,6 @@ static inline int switchdev_port_fdb_dump(struct sk_buff *skb,
return idx;
}
static inline void switchdev_port_fwd_mark_set(struct net_device *dev,
struct net_device *group_dev,
bool joining)
{
}
static inline bool switchdev_port_same_parent_id(struct net_device *a,
struct net_device *b)
{

2
net/bridge/Makefile
View File

@ -20,4 +20,6 @@ bridge-$(CONFIG_BRIDGE_IGMP_SNOOPING) += br_multicast.o br_mdb.o
bridge-$(CONFIG_BRIDGE_VLAN_FILTERING) += br_vlan.o
bridge-$(CONFIG_NET_SWITCHDEV) += br_switchdev.o
obj-$(CONFIG_NETFILTER) += netfilter/

3
net/bridge/br_forward.c
View File

@ -29,7 +29,8 @@ static inline int should_deliver(const struct net_bridge_port *p,
vg = nbp_vlan_group_rcu(p);
return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING;
br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING &&
nbp_switchdev_allowed_egress(p, skb);
}
int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)

10
net/bridge/br_if.c
View File

@ -545,6 +545,10 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
if (err)
goto err5;
err = nbp_switchdev_mark_set(p);
if (err)
goto err6;
dev_disable_lro(dev);
list_add_rcu(&p->list, &br->port_list);
@ -566,7 +570,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
err = nbp_vlan_init(p);
if (err) {
netdev_err(dev, "failed to initialize vlan filtering on this port\n");
goto err6;
goto err7;
}
spin_lock_bh(&br->lock);
@ -589,12 +593,12 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
return 0;
err6:
err7:
list_del_rcu(&p->list);
br_fdb_delete_by_port(br, p, 0, 1);
nbp_update_port_count(br);
err6:
netdev_upper_dev_unlink(dev, br->dev);
err5:
dev->priv_flags &= ~IFF_BRIDGE_PORT;
netdev_rx_handler_unregister(dev);

2
net/bridge/br_input.c
View File

@ -145,6 +145,8 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid))
goto out;
nbp_switchdev_frame_mark(p, skb);
/* insert into forwarding database after filtering to avoid spoofing */
br = p->br;
if (p->flags & BR_LEARNING)

37
net/bridge/br_private.h
View File

@ -251,6 +251,9 @@ struct net_bridge_port
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
struct net_bridge_vlan_group __rcu *vlgrp;
#endif
#ifdef CONFIG_NET_SWITCHDEV
int offload_fwd_mark;
#endif
};
#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
@ -359,6 +362,11 @@ struct net_bridge
struct timer_list gc_timer;
struct kobject *ifobj;
u32 auto_cnt;
#ifdef CONFIG_NET_SWITCHDEV
int offload_fwd_mark;
#endif
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
struct net_bridge_vlan_group __rcu *vlgrp;
u8 vlan_enabled;
@ -381,6 +389,10 @@ struct br_input_skb_cb {
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
bool vlan_filtered;
#endif
#ifdef CONFIG_NET_SWITCHDEV
int offload_fwd_mark;
#endif
};
#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
@ -1034,4 +1046,29 @@ static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
static inline void br_sysfs_delbr(struct net_device *dev) { return; }
#endif /* CONFIG_SYSFS */
/* br_switchdev.c */
#ifdef CONFIG_NET_SWITCHDEV
int nbp_switchdev_mark_set(struct net_bridge_port *p);
void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb);
bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
const struct sk_buff *skb);
#else
static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
{
return 0;
}
static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb)
{
}
static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
const struct sk_buff *skb)
{
return true;
}
#endif /* CONFIG_NET_SWITCHDEV */
#endif

57
net/bridge/br_switchdev.c Normal file
View File

@ -0,0 +1,57 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <net/switchdev.h>
#include "br_private.h"
static int br_switchdev_mark_get(struct net_bridge *br, struct net_device *dev)
{
struct net_bridge_port *p;
/* dev is yet to be added to the port list. */
list_for_each_entry(p, &br->port_list, list) {
if (switchdev_port_same_parent_id(dev, p->dev))
return p->offload_fwd_mark;
}
return ++br->offload_fwd_mark;
}
int nbp_switchdev_mark_set(struct net_bridge_port *p)
{
struct switchdev_attr attr = {
.orig_dev = p->dev,
.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
};
int err;
ASSERT_RTNL();
err = switchdev_port_attr_get(p->dev, &attr);
if (err) {
if (err == -EOPNOTSUPP)
return 0;
return err;
}
p->offload_fwd_mark = br_switchdev_mark_get(p->br, p->dev);
return 0;
}
void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb)
{
if (skb->offload_fwd_mark && !WARN_ON_ONCE(!p->offload_fwd_mark))
BR_INPUT_SKB_CB(skb)->offload_fwd_mark = p->offload_fwd_mark;
}
bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
const struct sk_buff *skb)
{
return !skb->offload_fwd_mark ||
BR_INPUT_SKB_CB(skb)->offload_fwd_mark != p->offload_fwd_mark;
}

10
net/core/dev.c
View File

@ -3355,16 +3355,6 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
else
skb_dst_force(skb);
#ifdef CONFIG_NET_SWITCHDEV
/* Don't forward if offload device already forwarded */
if (skb->offload_fwd_mark &&
skb->offload_fwd_mark == dev->offload_fwd_mark) {
consume_skb(skb);
rc = NET_XMIT_SUCCESS;
goto out;
}
#endif
txq = netdev_pick_tx(dev, skb, accel_priv);
q = rcu_dereference_bh(txq->qdisc);

85
net/switchdev/switchdev.c
View File

@ -1305,88 +1305,3 @@ bool switchdev_port_same_parent_id(struct net_device *a,
return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
}
EXPORT_SYMBOL_GPL(switchdev_port_same_parent_id);
static u32 switchdev_port_fwd_mark_get(struct net_device *dev,
struct net_device *group_dev)
{
struct net_device *lower_dev;
struct list_head *iter;
netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
if (lower_dev == dev)
continue;
if (switchdev_port_same_parent_id(dev, lower_dev))
return lower_dev->offload_fwd_mark;
return switchdev_port_fwd_mark_get(dev, lower_dev);
}
return dev->ifindex;
}
static void switchdev_port_fwd_mark_reset(struct net_device *group_dev,
u32 old_mark, u32 *reset_mark)
{
struct net_device *lower_dev;
struct list_head *iter;
netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
if (lower_dev->offload_fwd_mark == old_mark) {
if (!*reset_mark)
*reset_mark = lower_dev->ifindex;
lower_dev->offload_fwd_mark = *reset_mark;
}
switchdev_port_fwd_mark_reset(lower_dev, old_mark, reset_mark);
}
}
/**
* switchdev_port_fwd_mark_set - Set port offload forwarding mark
*
* @dev: port device
* @group_dev: containing device
* @joining: true if dev is joining group; false if leaving group
*
* An ungrouped port's offload mark is just its ifindex. A grouped
* port's (member of a bridge, for example) offload mark is the ifindex
* of one of the ports in the group with the same parent (switch) ID.
* Ports on the same device in the same group will have the same mark.
*
* Example:
*
* br0 ifindex=9
* sw1p1 ifindex=2 mark=2
* sw1p2 ifindex=3 mark=2
* sw2p1 ifindex=4 mark=5
* sw2p2 ifindex=5 mark=5
*
* If sw2p2 leaves the bridge, we'll have:
*
* br0 ifindex=9
* sw1p1 ifindex=2 mark=2
* sw1p2 ifindex=3 mark=2
* sw2p1 ifindex=4 mark=4
* sw2p2 ifindex=5 mark=5
*/
void switchdev_port_fwd_mark_set(struct net_device *dev,
struct net_device *group_dev,
bool joining)
{
u32 mark = dev->ifindex;
u32 reset_mark = 0;
if (group_dev) {
ASSERT_RTNL();
if (joining)
mark = switchdev_port_fwd_mark_get(dev, group_dev);
else if (dev->offload_fwd_mark == mark)
/* Ohoh, this port was the mark reference port,
* but it's leaving the group, so reset the
* mark for the remaining ports in the group.
*/
switchdev_port_fwd_mark_reset(group_dev, mark,
&reset_mark);
}
dev->offload_fwd_mark = mark;
}
EXPORT_SYMBOL_GPL(switchdev_port_fwd_mark_set);