bonding: change test for presence of VLANs
After commit ad1afb00393915a51c21b1ae8704562bf036855f
("vlan_dev: VLAN 0 should be treated as "no vlan tag" (802.1p packet)")
it is now regular practice for a VLAN "add vid" for VLAN 0 to
arrive prior to any VLAN registration or creation of a vlan_group.
This patch updates the bonding code that tests for the presence
of VLANs configured above bonding. The new logic tests for bond->vlgrp
to determine if a registration has occured, instead of testing that
bonding's internal vlan_list is empty.
The old code would panic when vlan_list was not empty, but
vlgrp was still NULL (because only an "add vid" for VLAN 0 had occured).
Bonding still adds VLAN 0 to its internal list so that 802.1p
frames are handled correctly on transmit when non-VLAN accelerated
slaves are members of the bond. The test against bond->vlan_list
remains in bond_dev_queue_xmit for this reason.
Modification to the bond->vlgrp now occurs under lock (in
addition to RTNL), because not all inspections of it occur under RTNL.
Additionally, because 8021q will never issue a "kill vid" for
VLAN 0, there is now logic in bond_uninit to release any remaining
entries from vlan_list.
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Cc: Pedro Garcia <pedro.netdev@dondevamos.com>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 20f45cb..f3b01ce 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -424,6 +424,7 @@
{
unsigned short uninitialized_var(vlan_id);
+ /* Test vlan_list not vlgrp to catch and handle 802.1p tags */
if (!list_empty(&bond->vlan_list) &&
!(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
vlan_get_tag(skb, &vlan_id) == 0) {
@@ -487,7 +488,9 @@
struct slave *slave;
int i;
+ write_lock(&bond->lock);
bond->vlgrp = grp;
+ write_unlock(&bond->lock);
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
@@ -569,7 +572,7 @@
write_lock_bh(&bond->lock);
- if (list_empty(&bond->vlan_list))
+ if (!bond->vlgrp)
goto out;
if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
@@ -596,7 +599,7 @@
write_lock_bh(&bond->lock);
- if (list_empty(&bond->vlan_list))
+ if (!bond->vlgrp)
goto out;
if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
@@ -604,6 +607,8 @@
goto unreg;
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
+ if (!vlan->vlan_id)
+ continue;
/* Save and then restore vlan_dev in the grp array,
* since the slave's driver might clear it.
*/
@@ -1443,7 +1448,7 @@
/* no need to lock since we're protected by rtnl_lock */
if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
- if (!list_empty(&bond->vlan_list)) {
+ if (bond->vlgrp) {
pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
bond_dev->name, slave_dev->name, bond_dev->name);
return -EPERM;
@@ -1942,7 +1947,7 @@
*/
memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
- if (list_empty(&bond->vlan_list)) {
+ if (!bond->vlgrp) {
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
} else {
pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
@@ -2134,9 +2139,9 @@
*/
memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
- if (list_empty(&bond->vlan_list))
+ if (!bond->vlgrp) {
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
- else {
+ } else {
pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
bond_dev->name, bond_dev->name);
pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
@@ -2569,7 +2574,7 @@
if (!targets[i])
break;
pr_debug("basa: target %x\n", targets[i]);
- if (list_empty(&bond->vlan_list)) {
+ if (!bond->vlgrp) {
pr_debug("basa: empty vlan: arp_send\n");
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
bond->master_ip, 0);
@@ -2658,6 +2663,9 @@
bond->master_ip, 0);
}
+ if (!bond->vlgrp)
+ return;
+
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
if (vlan->vlan_ip) {
@@ -3590,6 +3598,8 @@
}
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
+ if (!bond->vlgrp)
+ continue;
vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
if (vlan_dev == event_dev) {
switch (event) {
@@ -4686,6 +4696,7 @@
static void bond_uninit(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
+ struct vlan_entry *vlan, *tmp;
bond_netpoll_cleanup(bond_dev);
@@ -4699,6 +4710,11 @@
bond_remove_proc_entry(bond);
__hw_addr_flush(&bond->mc_list);
+
+ list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
+ list_del(&vlan->vlan_list);
+ kfree(vlan);
+ }
}
/*------------------------- Module initialization ---------------------------*/