mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-06 05:02:31 +00:00
27c5f74c7b
Currently, when a VLAN entry is added multiple times in a row to a bridge port, nbp_vlan_add() calls br_switchdev_port_vlan_add() each time, even if the VLAN already exists and nothing about it has changed: bridge vlan add dev lan12 vid 100 master static Similarly, when a VLAN is added multiple times in a row to a bridge, br_vlan_add_existing() doesn't filter at all the calls to br_switchdev_port_vlan_add(): bridge vlan add dev br0 vid 100 self This behavior makes driver-level accounting of VLANs impossible, since it is enough for a single deletion event to remove a VLAN, but the addition event can be emitted an unlimited number of times. The cause for this can be identified as follows: we rely on __vlan_add_flags() to retroactively tell us whether it has changed anything about the VLAN flags or VLAN group pvid. So we'd first have to call __vlan_add_flags() before calling br_switchdev_port_vlan_add(), in order to have access to the "bool *changed" information. But we don't want to change the event ordering, because we'd have to revert the struct net_bridge_vlan changes we've made if switchdev returns an error. So to solve this, we need another function that tells us whether any change is going to occur in the VLAN or VLAN group, _prior_ to calling __vlan_add_flags(). Split __vlan_add_flags() into a precommit and a commit stage, and rename it to __vlan_flags_update(). The precommit stage, __vlan_flags_would_change(), will determine whether there is any reason to notify switchdev due to a change of flags (note: the BRENTRY flag transition from false to true is treated separately: as a new switchdev entry, because we skipped notifying the master VLAN when it wasn't a brentry yet, and therefore not as a change of flags). With this lookahead/precommit function in place, we can avoid notifying switchdev if nothing changed for the VLAN and VLAN group. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|---|---|---|
| .. | ||
| netfilter | ||
| br_arp_nd_proxy.c | ||
| br_cfm_netlink.c | ||
| br_cfm.c | ||
| br_device.c | ||
| br_fdb.c | ||
| br_forward.c | ||
| br_if.c | ||
| br_input.c | ||
| br_ioctl.c | ||
| br_mdb.c | ||
| br_mrp_netlink.c | ||
| br_mrp_switchdev.c | ||
| br_mrp.c | ||
| br_multicast_eht.c | ||
| br_multicast.c | ||
| br_netfilter_hooks.c | ||
| br_netfilter_ipv6.c | ||
| br_netlink_tunnel.c | ||
| br_netlink.c | ||
| br_nf_core.c | ||
| br_private_cfm.h | ||
| br_private_mcast_eht.h | ||
| br_private_mrp.h | ||
| br_private_stp.h | ||
| br_private_tunnel.h | ||
| br_private.h | ||
| br_stp_bpdu.c | ||
| br_stp_if.c | ||
| br_stp_timer.c | ||
| br_stp.c | ||
| br_switchdev.c | ||
| br_sysfs_br.c | ||
| br_sysfs_if.c | ||
| br_vlan_options.c | ||
| br_vlan_tunnel.c | ||
| br_vlan.c | ||
| br.c | ||
| Kconfig | ||
| Makefile | ||