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net: bridge: vlan: notify on vlan add/delete/change flags 

Now that we can notify, send a notification on add/del or change of flags.
Notifications are also compressed when possible to reduce their number
and relieve user-space of extra processing, due to that we have to
manually notify after each add/del in order to avoid double
notifications. We try hard to notify only about the vlans which actually
changed, thus a single command can result in multiple notifications
about disjoint ranges if there were vlans which didn't change inside.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-01-14 19:56:14 +02:00 committed by David S. Miller
parent cf5bddb95c
commit f545923b4a
3 changed files with 99 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
net/bridge/br_netlink.c
View File

@ -568,9 +568,14 @@ int br_process_vlan_info(struct net_bridge *br,
bool *changed,
struct netlink_ext_ack *extack)
{
int err, rtm_cmd;
if (!br_vlan_valid_id(vinfo_curr->vid, extack))
return -EINVAL;
/* needed for vlan-only NEWVLAN/DELVLAN notifications */
rtm_cmd = br_afspec_cmd_to_rtm(cmd);
if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
return -EINVAL;
@ -580,7 +585,7 @@ int br_process_vlan_info(struct net_bridge *br,
if (*vinfo_last) {
struct bridge_vlan_info tmp_vinfo;
int v, err;
int v, v_change_start = 0;
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
return -EINVAL;
@ -588,18 +593,41 @@ int br_process_vlan_info(struct net_bridge *br,
memcpy(&tmp_vinfo, *vinfo_last,
sizeof(struct bridge_vlan_info));
for (v = (*vinfo_last)->vid; v <= vinfo_curr->vid; v++) {
bool curr_change = false;
tmp_vinfo.vid = v;
err = br_vlan_info(br, p, cmd, &tmp_vinfo, changed,
err = br_vlan_info(br, p, cmd, &tmp_vinfo, &curr_change,
extack);
if (err)
break;
if (curr_change) {
*changed = curr_change;
if (!v_change_start)
v_change_start = v;
} else {
/* nothing to notify yet */
if (!v_change_start)
continue;
br_vlan_notify(br, p, v_change_start,
v - 1, rtm_cmd);
v_change_start = 0;
}
}
/* v_change_start is set only if the last/whole range changed */
if (v_change_start)
br_vlan_notify(br, p, v_change_start,
v - 1, rtm_cmd);
*vinfo_last = NULL;
return err;
}
return br_vlan_info(br, p, cmd, vinfo_curr, changed, extack);
err = br_vlan_info(br, p, cmd, vinfo_curr, changed, extack);
if (*changed)
br_vlan_notify(br, p, vinfo_curr->vid, 0, rtm_cmd);
return err;
}
static int br_afspec(struct net_bridge *br,

12
net/bridge/br_private.h
View File

@ -554,6 +554,18 @@ static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
return true;
}
static inline int br_afspec_cmd_to_rtm(int cmd)
{
switch (cmd) {
case RTM_SETLINK:
return RTM_NEWVLAN;
case RTM_DELLINK:
return RTM_DELVLAN;
}
return 0;
}
static inline int br_opt_get(const struct net_bridge *br,
enum net_bridge_opts opt)
{

71
net/bridge/br_vlan.c
View File

@ -257,6 +257,10 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
&changed, extack);
if (err)
goto out_filt;
if (changed)
br_vlan_notify(br, NULL, v->vid, 0,
RTM_NEWVLAN);
}
masterv = br_vlan_get_master(br, v->vid, extack);
@ -380,13 +384,31 @@ static void __vlan_group_free(struct net_bridge_vlan_group *vg)
kfree(vg);
}
static void __vlan_flush(struct net_bridge_vlan_group *vg)
static void __vlan_flush(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg)
{
struct net_bridge_vlan *vlan, *tmp;
u16 v_start = 0, v_end = 0;
__vlan_delete_pvid(vg, vg->pvid);
list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) {
/* take care of disjoint ranges */
if (!v_start) {
v_start = vlan->vid;
} else if (vlan->vid - v_end != 1) {
/* found range end, notify and start next one */
br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
v_start = vlan->vid;
}
v_end = vlan->vid;
__vlan_del(vlan);
}
/* notify about the last/whole vlan range */
if (v_start)
br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
}
struct sk_buff *br_handle_vlan(struct net_bridge *br,
@ -716,7 +738,7 @@ void br_vlan_flush(struct net_bridge *br)
ASSERT_RTNL();
vg = br_vlan_group(br);
__vlan_flush(vg);
__vlan_flush(br, NULL, vg);
RCU_INIT_POINTER(br->vlgrp, NULL);
synchronize_rcu();
__vlan_group_free(vg);
@ -925,12 +947,15 @@ static void br_vlan_disable_default_pvid(struct net_bridge *br)
/* Disable default_pvid on all ports where it is still
* configured.
*/
if (vlan_default_pvid(br_vlan_group(br), pvid))
br_vlan_delete(br, pvid);
if (vlan_default_pvid(br_vlan_group(br), pvid)) {
if (!br_vlan_delete(br, pvid))
br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
}
list_for_each_entry(p, &br->port_list, list) {
if (vlan_default_pvid(nbp_vlan_group(p), pvid))
nbp_vlan_delete(p, pvid);
if (vlan_default_pvid(nbp_vlan_group(p), pvid) &&
!nbp_vlan_delete(p, pvid))
br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
}
br->default_pvid = 0;
@ -972,7 +997,10 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
&vlchange, extack);
if (err)
goto out;
br_vlan_delete(br, old_pvid);
if (br_vlan_delete(br, old_pvid))
br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN);
br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN);
set_bit(0, changed);
}
@ -992,7 +1020,9 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
&vlchange, extack);
if (err)
goto err_port;
nbp_vlan_delete(p, old_pvid);
if (nbp_vlan_delete(p, old_pvid))
br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN);
br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN);
set_bit(p->port_no, changed);
}
@ -1007,22 +1037,28 @@ err_port:
if (!test_bit(p->port_no, changed))
continue;
if (old_pvid)
if (old_pvid) {
nbp_vlan_add(p, old_pvid,
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED,
&vlchange, NULL);
br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN);
}
nbp_vlan_delete(p, pvid);
br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
}
if (test_bit(0, changed)) {
if (old_pvid)
if (old_pvid) {
br_vlan_add(br, old_pvid,
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED |
BRIDGE_VLAN_INFO_BRENTRY,
&vlchange, NULL);
br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN);
}
br_vlan_delete(br, pvid);
br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
}
goto out;
}
@ -1115,6 +1151,7 @@ int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack)
&changed, extack);
if (ret)
goto err_vlan_add;
br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN);
}
out:
return ret;
@ -1196,7 +1233,7 @@ void nbp_vlan_flush(struct net_bridge_port *port)
ASSERT_RTNL();
vg = nbp_vlan_group(port);
__vlan_flush(vg);
__vlan_flush(port->br, port, vg);
RCU_INIT_POINTER(port->vlgrp, NULL);
synchronize_rcu();
__vlan_group_free(vg);
@ -1462,8 +1499,8 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
{
struct netdev_notifier_changeupper_info *info;
struct net_bridge *br = netdev_priv(dev);
bool changed;
int ret = 0;
int vlcmd = 0, ret = 0;
bool changed = false;
switch (event) {
case NETDEV_REGISTER:
@ -1471,9 +1508,11 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED |
BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
vlcmd = RTM_NEWVLAN;
break;
case NETDEV_UNREGISTER:
br_vlan_delete(br, br->default_pvid);
changed = !br_vlan_delete(br, br->default_pvid);
vlcmd = RTM_DELVLAN;
break;
case NETDEV_CHANGEUPPER:
info = ptr;
@ -1487,6 +1526,8 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
br_vlan_link_state_change(dev, br);
break;
}
if (changed)
br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd);
return ret;
}