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macvlan: Move broadcasts into a work queue 

Currently broadcasts are handled in network RX context, where
the packets are sent through netif_rx.  This means that the number
of macvlans will be constrained by the capacity of netif_rx.

For example, setting up 4096 macvlans practically causes all
broadcast packets to be dropped as the default netif_rx queue
size simply can't handle 4096 skbs being stuffed into it all
at once.

Fundamentally, we need to ensure that the amount of work handled
in each netif_rx backlog run is constrained.  As broadcasts are
anything but constrained, it either needs to be limited per run
or moved to process context.

This patch picks the second option and moves all broadcast handling
bar the trivial case of packets going to a single interface into
a work queue.  Obviously there also needs to be a limit on how
many broadcast packets we postpone in this way.  I've arbitrarily
chosen tx_queue_len of the master device as the limit (act_mirred
also happens to use this parameter in a similar way).

In order to ensure we don't exceed the backlog queue we will use
netif_rx_ni instead of netif_rx for broadcast packets.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Thanks,
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2014-04-17 13:45:59 +08:00 committed by David S. Miller
parent a0265d28b3
commit 412ca1550c
1 changed files with 94 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
drivers/net/macvlan.c
View File

@ -30,6 +30,7 @@
#include <linux/if_link.h>
#include <linux/if_macvlan.h>
#include <linux/hash.h>
#include <linux/workqueue.h>
#include <net/rtnetlink.h>
#include <net/xfrm.h>
@ -40,10 +41,18 @@ struct macvlan_port {
struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
struct list_head vlans;
struct rcu_head rcu;
struct sk_buff_head bc_queue;
struct work_struct bc_work;
bool passthru;
int count;
};
struct macvlan_skb_cb {
const struct macvlan_dev *src;
};
#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
static void macvlan_port_destroy(struct net_device *dev);
static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
@ -120,7 +129,7 @@ static int macvlan_broadcast_one(struct sk_buff *skb,
struct net_device *dev = vlan->dev;
if (local)
return dev_forward_skb(dev, skb);
return __dev_forward_skb(dev, skb);
skb->dev = dev;
if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
@ -128,7 +137,7 @@ static int macvlan_broadcast_one(struct sk_buff *skb,
else
skb->pkt_type = PACKET_MULTICAST;
return netif_rx(skb);
return 0;
}
static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
@ -175,13 +184,84 @@ static void macvlan_broadcast(struct sk_buff *skb,
if (likely(nskb))
err = macvlan_broadcast_one(
nskb, vlan, eth,
mode == MACVLAN_MODE_BRIDGE);
mode == MACVLAN_MODE_BRIDGE) ?:
netif_rx_ni(nskb);
macvlan_count_rx(vlan, skb->len + ETH_HLEN,
err == NET_RX_SUCCESS, 1);
}
}
}
static void macvlan_process_broadcast(struct work_struct *w)
{
struct macvlan_port *port = container_of(w, struct macvlan_port,
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);
while ((skb = __skb_dequeue(&list))) {
const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
rcu_read_lock();
if (!src)
/* frame comes from an external address */
macvlan_broadcast(skb, port, NULL,
MACVLAN_MODE_PRIVATE |
MACVLAN_MODE_VEPA |
MACVLAN_MODE_PASSTHRU|
MACVLAN_MODE_BRIDGE);
else if (src->mode == MACVLAN_MODE_VEPA)
/* flood to everyone except source */
macvlan_broadcast(skb, port, src->dev,
MACVLAN_MODE_VEPA |
MACVLAN_MODE_BRIDGE);
else
/*
* flood only to VEPA ports, bridge ports
* already saw the frame on the way out.
*/
macvlan_broadcast(skb, port, src->dev,
MACVLAN_MODE_VEPA);
rcu_read_unlock();
kfree_skb(skb);
}
}
static void macvlan_broadcast_enqueue(struct macvlan_port *port,
struct sk_buff *skb)
{
int err = -ENOMEM;
skb = skb_clone(skb, GFP_ATOMIC);
if (!skb)
goto err;
spin_lock(&port->bc_queue.lock);
if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
__skb_queue_tail(&port->bc_queue, skb);
err = 0;
}
spin_unlock(&port->bc_queue.lock);
if (err)
goto err;
schedule_work(&port->bc_work);
return;
err:
atomic_long_inc(&skb->dev->rx_dropped);
}
/* called under rcu_read_lock() from netif_receive_skb */
static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
{
@ -201,32 +281,18 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
return RX_HANDLER_CONSUMED;
eth = eth_hdr(skb);
src = macvlan_hash_lookup(port, eth->h_source);
if (!src)
/* frame comes from an external address */
macvlan_broadcast(skb, port, NULL,
MACVLAN_MODE_PRIVATE |
MACVLAN_MODE_VEPA |
MACVLAN_MODE_PASSTHRU|
MACVLAN_MODE_BRIDGE);
else if (src->mode == MACVLAN_MODE_VEPA)
/* flood to everyone except source */
macvlan_broadcast(skb, port, src->dev,
MACVLAN_MODE_VEPA |
MACVLAN_MODE_BRIDGE);
else if (src->mode == MACVLAN_MODE_BRIDGE)
/*
* flood only to VEPA ports, bridge ports
* already saw the frame on the way out.
*/
macvlan_broadcast(skb, port, src->dev,
MACVLAN_MODE_VEPA);
else {
if (src && src->mode != MACVLAN_MODE_VEPA &&
src->mode != MACVLAN_MODE_BRIDGE) {
/* forward to original port. */
vlan = src;
ret = macvlan_broadcast_one(skb, vlan, eth, 0);
ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
netif_rx(skb);
goto out;
}
MACVLAN_SKB_CB(skb)->src = src;
macvlan_broadcast_enqueue(port, skb);
return RX_HANDLER_PASS;
}
@ -764,6 +830,9 @@ static int macvlan_port_create(struct net_device *dev)
for (i = 0; i < MACVLAN_HASH_SIZE; i++)
INIT_HLIST_HEAD(&port->vlan_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);
@ -776,6 +845,7 @@ static void macvlan_port_destroy(struct net_device *dev)
{
struct macvlan_port *port = macvlan_port_get_rtnl(dev);
cancel_work_sync(&port->bc_work);
dev->priv_flags &= ~IFF_MACVLAN_PORT;
netdev_rx_handler_unregister(dev);
kfree_rcu(port, rcu);