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Message-ID: <154116580015.953950.9450253307804393677.stgit@buzz>
Date: Fri, 02 Nov 2018 16:36:40 +0300
From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
linux-kernel@...r.kernel.org
Cc: Vadim Fedorenko <junk@...dex-team.ru>
Subject: [PATCH] macvlan: use per-cpu queues for broadcast and multicast
packets
Currently macvlan has single per-port queue for broadcast and multicast.
This disrupts order of packets when flows from different cpus are mixed.
This patch replaces this queue with single set of per-cpu queues.
Pointer to macvlan port is passed in skb control block.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Reported-add-tested-by: Vadim Fedorenko <vfedorenko@...dex-team.ru>
---
drivers/net/macvlan.c | 65 +++++++++++++++++++++++++++++--------------------
1 file changed, 38 insertions(+), 27 deletions(-)
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index fc8d5f1ee1ad..1e9c37ec43c3 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -46,8 +46,6 @@ struct macvlan_port {
struct net_device *dev;
struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
struct list_head vlans;
- struct sk_buff_head bc_queue;
- struct work_struct bc_work;
u32 flags;
int count;
struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
@@ -55,6 +53,11 @@ struct macvlan_port {
unsigned char perm_addr[ETH_ALEN];
};
+struct macvlan_bc_work {
+ struct sk_buff_head bc_queue;
+ struct work_struct bc_work;
+};
+
struct macvlan_source_entry {
struct hlist_node hlist;
struct macvlan_dev *vlan;
@@ -63,6 +66,7 @@ struct macvlan_source_entry {
};
struct macvlan_skb_cb {
+ const struct macvlan_port *port;
const struct macvlan_dev *src;
};
@@ -295,20 +299,23 @@ static void macvlan_broadcast(struct sk_buff *skb,
}
}
+static DEFINE_PER_CPU(struct macvlan_bc_work, macvlan_bc_work);
+
static void macvlan_process_broadcast(struct work_struct *w)
{
- struct macvlan_port *port = container_of(w, struct macvlan_port,
+ struct macvlan_bc_work *work = container_of(w, struct macvlan_bc_work,
bc_work);
struct sk_buff *skb;
struct sk_buff_head list;
__skb_queue_head_init(&list);
- spin_lock_bh(&port->bc_queue.lock);
- skb_queue_splice_tail_init(&port->bc_queue, &list);
- spin_unlock_bh(&port->bc_queue.lock);
+ spin_lock_bh(&work->bc_queue.lock);
+ skb_queue_splice_tail_init(&work->bc_queue, &list);
+ spin_unlock_bh(&work->bc_queue.lock);
while ((skb = __skb_dequeue(&list))) {
+ const struct macvlan_port *port = MACVLAN_SKB_CB(skb)->port;
const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
rcu_read_lock();
@@ -345,6 +352,7 @@ static void macvlan_broadcast_enqueue(struct macvlan_port *port,
const struct macvlan_dev *src,
struct sk_buff *skb)
{
+ struct macvlan_bc_work *work;
struct sk_buff *nskb;
int err = -ENOMEM;
@@ -352,24 +360,30 @@ static void macvlan_broadcast_enqueue(struct macvlan_port *port,
if (!nskb)
goto err;
+ MACVLAN_SKB_CB(nskb)->port = port;
MACVLAN_SKB_CB(nskb)->src = src;
- spin_lock(&port->bc_queue.lock);
- if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
+ work = get_cpu_ptr(&macvlan_bc_work);
+
+ spin_lock(&work->bc_queue.lock);
+ if (skb_queue_len(&work->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
if (src)
dev_hold(src->dev);
- __skb_queue_tail(&port->bc_queue, nskb);
+ __skb_queue_tail(&work->bc_queue, nskb);
err = 0;
}
- spin_unlock(&port->bc_queue.lock);
+ spin_unlock(&work->bc_queue.lock);
if (err)
goto free_nskb;
- schedule_work(&port->bc_work);
+ schedule_work_on(smp_processor_id(), &work->bc_work);
+ put_cpu_ptr(work);
+
return;
free_nskb:
+ put_cpu_ptr(work);
kfree_skb(nskb);
err:
atomic_long_inc(&skb->dev->rx_dropped);
@@ -1168,9 +1182,6 @@ static int macvlan_port_create(struct net_device *dev)
for (i = 0; i < MACVLAN_HASH_SIZE; i++)
INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
- skb_queue_head_init(&port->bc_queue);
- INIT_WORK(&port->bc_work, macvlan_process_broadcast);
-
err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
if (err)
kfree(port);
@@ -1182,24 +1193,16 @@ static int macvlan_port_create(struct net_device *dev)
static void macvlan_port_destroy(struct net_device *dev)
{
struct macvlan_port *port = macvlan_port_get_rtnl(dev);
- struct sk_buff *skb;
+ int cpu;
dev->priv_flags &= ~IFF_MACVLAN_PORT;
netdev_rx_handler_unregister(dev);
/* After this point, no packet can schedule bc_work anymore,
- * but we need to cancel it and purge left skbs if any.
+ * but we need to flush work.
*/
- cancel_work_sync(&port->bc_work);
-
- while ((skb = __skb_dequeue(&port->bc_queue))) {
- const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
-
- if (src)
- dev_put(src->dev);
-
- kfree_skb(skb);
- }
+ for_each_possible_cpu(cpu)
+ flush_work(per_cpu_ptr(&macvlan_bc_work.bc_work, cpu));
/* If the lower device address has been changed by passthru
* macvlan, put it back.
@@ -1702,7 +1705,15 @@ static struct notifier_block macvlan_notifier_block __read_mostly = {
static int __init macvlan_init_module(void)
{
- int err;
+ int err, cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct macvlan_bc_work *work;
+
+ work = per_cpu_ptr(&macvlan_bc_work, cpu);
+ skb_queue_head_init(&work->bc_queue);
+ INIT_WORK(&work->bc_work, macvlan_process_broadcast);
+ }
register_netdevice_notifier(&macvlan_notifier_block);
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