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| author | Igor Druzhinin <igor.druzhinin@citrix.com> | 2019-02-28 15:11:26 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-02-28 21:50:37 +0100 |
| commit | a2288d4e355992d369c50c45d017a85f6061ff71 (patch) | |
| tree | 29c9e1a705304424084678266ea7fec916fe8c6a /drivers/net/xen-netback | |
| parent | xen-netback: fix occasional leak of grant ref mappings under memory pressure (diff) | |
| download | linux-a2288d4e355992d369c50c45d017a85f6061ff71.tar.xz linux-a2288d4e355992d369c50c45d017a85f6061ff71.zip | |
xen-netback: don't populate the hash cache on XenBus disconnect
Occasionally, during the disconnection procedure on XenBus which
includes hash cache deinitialization there might be some packets
still in-flight on other processors. Handling of these packets includes
hashing and hash cache population that finally results in hash cache
data structure corruption.
In order to avoid this we prevent hashing of those packets if there
are no queues initialized. In that case RCU protection of queues guards
the hash cache as well.
Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/xen-netback')
| -rw-r--r-- | drivers/net/xen-netback/hash.c | 2 | ||||
| -rw-r--r-- | drivers/net/xen-netback/interface.c | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/xen-netback/hash.c b/drivers/net/xen-netback/hash.c index 0ccb021f1e78..10d580c3dea3 100644 --- a/drivers/net/xen-netback/hash.c +++ b/drivers/net/xen-netback/hash.c @@ -454,6 +454,8 @@ void xenvif_init_hash(struct xenvif *vif) if (xenvif_hash_cache_size == 0) return; + BUG_ON(vif->hash.cache.count); + spin_lock_init(&vif->hash.cache.lock); INIT_LIST_HEAD(&vif->hash.cache.list); } diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index 182d6770f102..6da12518e693 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -153,6 +153,13 @@ static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb, { struct xenvif *vif = netdev_priv(dev); unsigned int size = vif->hash.size; + unsigned int num_queues; + + /* If queues are not set up internally - always return 0 + * as the packet going to be dropped anyway */ + num_queues = READ_ONCE(vif->num_queues); + if (num_queues < 1) + return 0; if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) return fallback(dev, skb, NULL) % dev->real_num_tx_queues; |